10a708f8fSGustavo F. Padovan /* 20a708f8fSGustavo F. Padovan BlueZ - Bluetooth protocol stack for Linux 30a708f8fSGustavo F. Padovan Copyright (C) 2000-2001 Qualcomm Incorporated 40a708f8fSGustavo F. Padovan Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org> 50a708f8fSGustavo F. Padovan Copyright (C) 2010 Google Inc. 6590051deSGustavo F. Padovan Copyright (C) 2011 ProFUSION Embedded Systems 7422e925bSMat Martineau Copyright (c) 2012 Code Aurora Forum. All rights reserved. 80a708f8fSGustavo F. Padovan 90a708f8fSGustavo F. Padovan Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> 100a708f8fSGustavo F. Padovan 110a708f8fSGustavo F. Padovan This program is free software; you can redistribute it and/or modify 120a708f8fSGustavo F. Padovan it under the terms of the GNU General Public License version 2 as 130a708f8fSGustavo F. Padovan published by the Free Software Foundation; 140a708f8fSGustavo F. Padovan 150a708f8fSGustavo F. Padovan THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 160a708f8fSGustavo F. Padovan OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 170a708f8fSGustavo F. Padovan FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. 180a708f8fSGustavo F. Padovan IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY 190a708f8fSGustavo F. Padovan CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES 200a708f8fSGustavo F. Padovan WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 210a708f8fSGustavo F. Padovan ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 220a708f8fSGustavo F. Padovan OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 230a708f8fSGustavo F. Padovan 240a708f8fSGustavo F. Padovan ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, 250a708f8fSGustavo F. Padovan COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS 260a708f8fSGustavo F. Padovan SOFTWARE IS DISCLAIMED. 270a708f8fSGustavo F. Padovan */ 280a708f8fSGustavo F. Padovan 29bb58f747SGustavo F. Padovan /* Bluetooth L2CAP core. */ 300a708f8fSGustavo F. Padovan 310a708f8fSGustavo F. Padovan #include <linux/module.h> 320a708f8fSGustavo F. Padovan 330a708f8fSGustavo F. Padovan #include <linux/debugfs.h> 340a708f8fSGustavo F. Padovan #include <linux/crc16.h> 350a708f8fSGustavo F. Padovan 360a708f8fSGustavo F. Padovan #include <net/bluetooth/bluetooth.h> 370a708f8fSGustavo F. Padovan #include <net/bluetooth/hci_core.h> 380a708f8fSGustavo F. Padovan #include <net/bluetooth/l2cap.h> 39b501d6a1SAnderson Briglia #include <net/bluetooth/smp.h> 4097e8e89dSAndrei Emeltchenko #include <net/bluetooth/a2mp.h> 415ce66b59SAndrei Emeltchenko #include <net/bluetooth/amp.h> 420a708f8fSGustavo F. Padovan 43d1de6d46SMat Martineau bool disable_ertm; 440a708f8fSGustavo F. Padovan 450a708f8fSGustavo F. Padovan static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN; 4650a147cdSMat Martineau static u8 l2cap_fixed_chan[8] = { L2CAP_FC_L2CAP, }; 470a708f8fSGustavo F. Padovan 48b5ad8b7fSJohannes Berg static LIST_HEAD(chan_list); 49b5ad8b7fSJohannes Berg static DEFINE_RWLOCK(chan_list_lock); 500a708f8fSGustavo F. Padovan 510a708f8fSGustavo F. Padovan static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, 520a708f8fSGustavo F. Padovan u8 code, u8 ident, u16 dlen, void *data); 534519de9aSGustavo F. Padovan static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, 544519de9aSGustavo F. Padovan void *data); 55710f9b0aSGustavo F. Padovan static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data); 565e4e3972SAndrei Emeltchenko static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err); 570a708f8fSGustavo F. Padovan 58d660366dSGustavo Padovan static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, 59608bcc6dSMat Martineau struct sk_buff_head *skbs, u8 event); 60608bcc6dSMat Martineau 610a708f8fSGustavo F. Padovan /* ---- L2CAP channels ---- */ 6271ba0e56SGustavo F. Padovan 632d792818SGustavo Padovan static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, 642d792818SGustavo Padovan u16 cid) 650a708f8fSGustavo F. Padovan { 663df91ea2SAndrei Emeltchenko struct l2cap_chan *c; 67baa7e1faSGustavo F. Padovan 683df91ea2SAndrei Emeltchenko list_for_each_entry(c, &conn->chan_l, list) { 693df91ea2SAndrei Emeltchenko if (c->dcid == cid) 703df91ea2SAndrei Emeltchenko return c; 710a708f8fSGustavo F. Padovan } 723df91ea2SAndrei Emeltchenko return NULL; 73baa7e1faSGustavo F. Padovan } 740a708f8fSGustavo F. Padovan 752d792818SGustavo Padovan static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, 762d792818SGustavo Padovan u16 cid) 770a708f8fSGustavo F. Padovan { 783df91ea2SAndrei Emeltchenko struct l2cap_chan *c; 79baa7e1faSGustavo F. Padovan 803df91ea2SAndrei Emeltchenko list_for_each_entry(c, &conn->chan_l, list) { 813df91ea2SAndrei Emeltchenko if (c->scid == cid) 823df91ea2SAndrei Emeltchenko return c; 830a708f8fSGustavo F. Padovan } 843df91ea2SAndrei Emeltchenko return NULL; 85baa7e1faSGustavo F. Padovan } 860a708f8fSGustavo F. Padovan 870a708f8fSGustavo F. Padovan /* Find channel with given SCID. 88ef191adeSMat Martineau * Returns locked channel. */ 892d792818SGustavo Padovan static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, 902d792818SGustavo Padovan u16 cid) 910a708f8fSGustavo F. Padovan { 9248454079SGustavo F. Padovan struct l2cap_chan *c; 93baa7e1faSGustavo F. Padovan 943df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 95baa7e1faSGustavo F. Padovan c = __l2cap_get_chan_by_scid(conn, cid); 96ef191adeSMat Martineau if (c) 97ef191adeSMat Martineau l2cap_chan_lock(c); 983df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 993df91ea2SAndrei Emeltchenko 10048454079SGustavo F. Padovan return c; 1010a708f8fSGustavo F. Padovan } 1020a708f8fSGustavo F. Padovan 103b1a130b7SMat Martineau /* Find channel with given DCID. 104b1a130b7SMat Martineau * Returns locked channel. 105b1a130b7SMat Martineau */ 106b1a130b7SMat Martineau static struct l2cap_chan *l2cap_get_chan_by_dcid(struct l2cap_conn *conn, 107b1a130b7SMat Martineau u16 cid) 108b1a130b7SMat Martineau { 109b1a130b7SMat Martineau struct l2cap_chan *c; 110b1a130b7SMat Martineau 111b1a130b7SMat Martineau mutex_lock(&conn->chan_lock); 112b1a130b7SMat Martineau c = __l2cap_get_chan_by_dcid(conn, cid); 113b1a130b7SMat Martineau if (c) 114b1a130b7SMat Martineau l2cap_chan_lock(c); 115b1a130b7SMat Martineau mutex_unlock(&conn->chan_lock); 116b1a130b7SMat Martineau 117b1a130b7SMat Martineau return c; 118b1a130b7SMat Martineau } 119b1a130b7SMat Martineau 1202d792818SGustavo Padovan static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, 1212d792818SGustavo Padovan u8 ident) 1220a708f8fSGustavo F. Padovan { 1233df91ea2SAndrei Emeltchenko struct l2cap_chan *c; 124baa7e1faSGustavo F. Padovan 1253df91ea2SAndrei Emeltchenko list_for_each_entry(c, &conn->chan_l, list) { 1263df91ea2SAndrei Emeltchenko if (c->ident == ident) 1273df91ea2SAndrei Emeltchenko return c; 1280a708f8fSGustavo F. Padovan } 1293df91ea2SAndrei Emeltchenko return NULL; 130baa7e1faSGustavo F. Padovan } 1310a708f8fSGustavo F. Padovan 1325b155ef9SMat Martineau static struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn, 1335b155ef9SMat Martineau u8 ident) 1345b155ef9SMat Martineau { 1355b155ef9SMat Martineau struct l2cap_chan *c; 1365b155ef9SMat Martineau 1375b155ef9SMat Martineau mutex_lock(&conn->chan_lock); 1385b155ef9SMat Martineau c = __l2cap_get_chan_by_ident(conn, ident); 1395b155ef9SMat Martineau if (c) 1405b155ef9SMat Martineau l2cap_chan_lock(c); 1415b155ef9SMat Martineau mutex_unlock(&conn->chan_lock); 1425b155ef9SMat Martineau 1435b155ef9SMat Martineau return c; 1445b155ef9SMat Martineau } 1455b155ef9SMat Martineau 14623691d75SGustavo F. Padovan static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src) 1479e4425ffSGustavo F. Padovan { 14823691d75SGustavo F. Padovan struct l2cap_chan *c; 1499e4425ffSGustavo F. Padovan 15023691d75SGustavo F. Padovan list_for_each_entry(c, &chan_list, global_l) { 15123691d75SGustavo F. Padovan if (c->sport == psm && !bacmp(&bt_sk(c->sk)->src, src)) 15223691d75SGustavo F. Padovan return c; 1539e4425ffSGustavo F. Padovan } 154250938cbSSzymon Janc return NULL; 155250938cbSSzymon Janc } 1569e4425ffSGustavo F. Padovan 1579e4425ffSGustavo F. Padovan int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm) 1589e4425ffSGustavo F. Padovan { 15973b2ec18SGustavo F. Padovan int err; 16073b2ec18SGustavo F. Padovan 161333055f2SGustavo F. Padovan write_lock(&chan_list_lock); 1629e4425ffSGustavo F. Padovan 16323691d75SGustavo F. Padovan if (psm && __l2cap_global_chan_by_addr(psm, src)) { 16473b2ec18SGustavo F. Padovan err = -EADDRINUSE; 16573b2ec18SGustavo F. Padovan goto done; 1669e4425ffSGustavo F. Padovan } 1679e4425ffSGustavo F. Padovan 16873b2ec18SGustavo F. Padovan if (psm) { 1699e4425ffSGustavo F. Padovan chan->psm = psm; 1709e4425ffSGustavo F. Padovan chan->sport = psm; 17173b2ec18SGustavo F. Padovan err = 0; 17273b2ec18SGustavo F. Padovan } else { 17373b2ec18SGustavo F. Padovan u16 p; 1749e4425ffSGustavo F. Padovan 17573b2ec18SGustavo F. Padovan err = -EINVAL; 17673b2ec18SGustavo F. Padovan for (p = 0x1001; p < 0x1100; p += 2) 17723691d75SGustavo F. Padovan if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) { 17873b2ec18SGustavo F. Padovan chan->psm = cpu_to_le16(p); 17973b2ec18SGustavo F. Padovan chan->sport = cpu_to_le16(p); 18073b2ec18SGustavo F. Padovan err = 0; 18173b2ec18SGustavo F. Padovan break; 18273b2ec18SGustavo F. Padovan } 18373b2ec18SGustavo F. Padovan } 18473b2ec18SGustavo F. Padovan 18573b2ec18SGustavo F. Padovan done: 186333055f2SGustavo F. Padovan write_unlock(&chan_list_lock); 18773b2ec18SGustavo F. Padovan return err; 1889e4425ffSGustavo F. Padovan } 1899e4425ffSGustavo F. Padovan 1909e4425ffSGustavo F. Padovan int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid) 1919e4425ffSGustavo F. Padovan { 192333055f2SGustavo F. Padovan write_lock(&chan_list_lock); 1939e4425ffSGustavo F. Padovan 1949e4425ffSGustavo F. Padovan chan->scid = scid; 1959e4425ffSGustavo F. Padovan 196333055f2SGustavo F. Padovan write_unlock(&chan_list_lock); 1979e4425ffSGustavo F. Padovan 1989e4425ffSGustavo F. Padovan return 0; 1999e4425ffSGustavo F. Padovan } 2009e4425ffSGustavo F. Padovan 201baa7e1faSGustavo F. Padovan static u16 l2cap_alloc_cid(struct l2cap_conn *conn) 2020a708f8fSGustavo F. Padovan { 2030a708f8fSGustavo F. Padovan u16 cid = L2CAP_CID_DYN_START; 2040a708f8fSGustavo F. Padovan 2050a708f8fSGustavo F. Padovan for (; cid < L2CAP_CID_DYN_END; cid++) { 206baa7e1faSGustavo F. Padovan if (!__l2cap_get_chan_by_scid(conn, cid)) 2070a708f8fSGustavo F. Padovan return cid; 2080a708f8fSGustavo F. Padovan } 2090a708f8fSGustavo F. Padovan 2100a708f8fSGustavo F. Padovan return 0; 2110a708f8fSGustavo F. Padovan } 2120a708f8fSGustavo F. Padovan 2130e587be7SAndrei Emeltchenko static void __l2cap_state_change(struct l2cap_chan *chan, int state) 21489bc500eSGustavo F. Padovan { 21542d2d87cSAndrei Emeltchenko BT_DBG("chan %p %s -> %s", chan, state_to_string(chan->state), 216badaaa00SGustavo F. Padovan state_to_string(state)); 217badaaa00SGustavo F. Padovan 21889bc500eSGustavo F. Padovan chan->state = state; 21980b98027SGustavo Padovan chan->ops->state_change(chan, state); 22089bc500eSGustavo F. Padovan } 22189bc500eSGustavo F. Padovan 2220e587be7SAndrei Emeltchenko static void l2cap_state_change(struct l2cap_chan *chan, int state) 2230e587be7SAndrei Emeltchenko { 2240e587be7SAndrei Emeltchenko struct sock *sk = chan->sk; 2250e587be7SAndrei Emeltchenko 2260e587be7SAndrei Emeltchenko lock_sock(sk); 2270e587be7SAndrei Emeltchenko __l2cap_state_change(chan, state); 2280e587be7SAndrei Emeltchenko release_sock(sk); 2290e587be7SAndrei Emeltchenko } 2300e587be7SAndrei Emeltchenko 2312e0052e4SAndrei Emeltchenko static inline void __l2cap_chan_set_err(struct l2cap_chan *chan, int err) 2322e0052e4SAndrei Emeltchenko { 2332e0052e4SAndrei Emeltchenko struct sock *sk = chan->sk; 2342e0052e4SAndrei Emeltchenko 2352e0052e4SAndrei Emeltchenko sk->sk_err = err; 2362e0052e4SAndrei Emeltchenko } 2372e0052e4SAndrei Emeltchenko 2382e0052e4SAndrei Emeltchenko static inline void l2cap_chan_set_err(struct l2cap_chan *chan, int err) 2392e0052e4SAndrei Emeltchenko { 2402e0052e4SAndrei Emeltchenko struct sock *sk = chan->sk; 2412e0052e4SAndrei Emeltchenko 2422e0052e4SAndrei Emeltchenko lock_sock(sk); 2432e0052e4SAndrei Emeltchenko __l2cap_chan_set_err(chan, err); 2442e0052e4SAndrei Emeltchenko release_sock(sk); 2452e0052e4SAndrei Emeltchenko } 2462e0052e4SAndrei Emeltchenko 2474239d16fSMat Martineau static void __set_retrans_timer(struct l2cap_chan *chan) 2484239d16fSMat Martineau { 2494239d16fSMat Martineau if (!delayed_work_pending(&chan->monitor_timer) && 2504239d16fSMat Martineau chan->retrans_timeout) { 2514239d16fSMat Martineau l2cap_set_timer(chan, &chan->retrans_timer, 2524239d16fSMat Martineau msecs_to_jiffies(chan->retrans_timeout)); 2534239d16fSMat Martineau } 2544239d16fSMat Martineau } 2554239d16fSMat Martineau 2564239d16fSMat Martineau static void __set_monitor_timer(struct l2cap_chan *chan) 2574239d16fSMat Martineau { 2584239d16fSMat Martineau __clear_retrans_timer(chan); 2594239d16fSMat Martineau if (chan->monitor_timeout) { 2604239d16fSMat Martineau l2cap_set_timer(chan, &chan->monitor_timer, 2614239d16fSMat Martineau msecs_to_jiffies(chan->monitor_timeout)); 2624239d16fSMat Martineau } 2634239d16fSMat Martineau } 2644239d16fSMat Martineau 265608bcc6dSMat Martineau static struct sk_buff *l2cap_ertm_seq_in_queue(struct sk_buff_head *head, 266608bcc6dSMat Martineau u16 seq) 267608bcc6dSMat Martineau { 268608bcc6dSMat Martineau struct sk_buff *skb; 269608bcc6dSMat Martineau 270608bcc6dSMat Martineau skb_queue_walk(head, skb) { 271608bcc6dSMat Martineau if (bt_cb(skb)->control.txseq == seq) 272608bcc6dSMat Martineau return skb; 273608bcc6dSMat Martineau } 274608bcc6dSMat Martineau 275608bcc6dSMat Martineau return NULL; 276608bcc6dSMat Martineau } 277608bcc6dSMat Martineau 2783c588192SMat Martineau /* ---- L2CAP sequence number lists ---- */ 2793c588192SMat Martineau 2803c588192SMat Martineau /* For ERTM, ordered lists of sequence numbers must be tracked for 2813c588192SMat Martineau * SREJ requests that are received and for frames that are to be 2823c588192SMat Martineau * retransmitted. These seq_list functions implement a singly-linked 2833c588192SMat Martineau * list in an array, where membership in the list can also be checked 2843c588192SMat Martineau * in constant time. Items can also be added to the tail of the list 2853c588192SMat Martineau * and removed from the head in constant time, without further memory 2863c588192SMat Martineau * allocs or frees. 2873c588192SMat Martineau */ 2883c588192SMat Martineau 2893c588192SMat Martineau static int l2cap_seq_list_init(struct l2cap_seq_list *seq_list, u16 size) 2903c588192SMat Martineau { 2913c588192SMat Martineau size_t alloc_size, i; 2923c588192SMat Martineau 2933c588192SMat Martineau /* Allocated size is a power of 2 to map sequence numbers 2943c588192SMat Martineau * (which may be up to 14 bits) in to a smaller array that is 2953c588192SMat Martineau * sized for the negotiated ERTM transmit windows. 2963c588192SMat Martineau */ 2973c588192SMat Martineau alloc_size = roundup_pow_of_two(size); 2983c588192SMat Martineau 2993c588192SMat Martineau seq_list->list = kmalloc(sizeof(u16) * alloc_size, GFP_KERNEL); 3003c588192SMat Martineau if (!seq_list->list) 3013c588192SMat Martineau return -ENOMEM; 3023c588192SMat Martineau 3033c588192SMat Martineau seq_list->mask = alloc_size - 1; 3043c588192SMat Martineau seq_list->head = L2CAP_SEQ_LIST_CLEAR; 3053c588192SMat Martineau seq_list->tail = L2CAP_SEQ_LIST_CLEAR; 3063c588192SMat Martineau for (i = 0; i < alloc_size; i++) 3073c588192SMat Martineau seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; 3083c588192SMat Martineau 3093c588192SMat Martineau return 0; 3103c588192SMat Martineau } 3113c588192SMat Martineau 3123c588192SMat Martineau static inline void l2cap_seq_list_free(struct l2cap_seq_list *seq_list) 3133c588192SMat Martineau { 3143c588192SMat Martineau kfree(seq_list->list); 3153c588192SMat Martineau } 3163c588192SMat Martineau 3173c588192SMat Martineau static inline bool l2cap_seq_list_contains(struct l2cap_seq_list *seq_list, 3183c588192SMat Martineau u16 seq) 3193c588192SMat Martineau { 3203c588192SMat Martineau /* Constant-time check for list membership */ 3213c588192SMat Martineau return seq_list->list[seq & seq_list->mask] != L2CAP_SEQ_LIST_CLEAR; 3223c588192SMat Martineau } 3233c588192SMat Martineau 3243c588192SMat Martineau static u16 l2cap_seq_list_remove(struct l2cap_seq_list *seq_list, u16 seq) 3253c588192SMat Martineau { 3263c588192SMat Martineau u16 mask = seq_list->mask; 3273c588192SMat Martineau 3283c588192SMat Martineau if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) { 3293c588192SMat Martineau /* In case someone tries to pop the head of an empty list */ 3303c588192SMat Martineau return L2CAP_SEQ_LIST_CLEAR; 3313c588192SMat Martineau } else if (seq_list->head == seq) { 3323c588192SMat Martineau /* Head can be removed in constant time */ 3333c588192SMat Martineau seq_list->head = seq_list->list[seq & mask]; 3343c588192SMat Martineau seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR; 3353c588192SMat Martineau 3363c588192SMat Martineau if (seq_list->head == L2CAP_SEQ_LIST_TAIL) { 3373c588192SMat Martineau seq_list->head = L2CAP_SEQ_LIST_CLEAR; 3383c588192SMat Martineau seq_list->tail = L2CAP_SEQ_LIST_CLEAR; 3393c588192SMat Martineau } 3403c588192SMat Martineau } else { 3413c588192SMat Martineau /* Walk the list to find the sequence number */ 3423c588192SMat Martineau u16 prev = seq_list->head; 3433c588192SMat Martineau while (seq_list->list[prev & mask] != seq) { 3443c588192SMat Martineau prev = seq_list->list[prev & mask]; 3453c588192SMat Martineau if (prev == L2CAP_SEQ_LIST_TAIL) 3463c588192SMat Martineau return L2CAP_SEQ_LIST_CLEAR; 3473c588192SMat Martineau } 3483c588192SMat Martineau 3493c588192SMat Martineau /* Unlink the number from the list and clear it */ 3503c588192SMat Martineau seq_list->list[prev & mask] = seq_list->list[seq & mask]; 3513c588192SMat Martineau seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR; 3523c588192SMat Martineau if (seq_list->tail == seq) 3533c588192SMat Martineau seq_list->tail = prev; 3543c588192SMat Martineau } 3553c588192SMat Martineau return seq; 3563c588192SMat Martineau } 3573c588192SMat Martineau 3583c588192SMat Martineau static inline u16 l2cap_seq_list_pop(struct l2cap_seq_list *seq_list) 3593c588192SMat Martineau { 3603c588192SMat Martineau /* Remove the head in constant time */ 3613c588192SMat Martineau return l2cap_seq_list_remove(seq_list, seq_list->head); 3623c588192SMat Martineau } 3633c588192SMat Martineau 3643c588192SMat Martineau static void l2cap_seq_list_clear(struct l2cap_seq_list *seq_list) 3653c588192SMat Martineau { 3663c588192SMat Martineau u16 i; 367f522ae36SGustavo Padovan 368f522ae36SGustavo Padovan if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) 369f522ae36SGustavo Padovan return; 370f522ae36SGustavo Padovan 3713c588192SMat Martineau for (i = 0; i <= seq_list->mask; i++) 3723c588192SMat Martineau seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; 3733c588192SMat Martineau 3743c588192SMat Martineau seq_list->head = L2CAP_SEQ_LIST_CLEAR; 3753c588192SMat Martineau seq_list->tail = L2CAP_SEQ_LIST_CLEAR; 3763c588192SMat Martineau } 3773c588192SMat Martineau 3783c588192SMat Martineau static void l2cap_seq_list_append(struct l2cap_seq_list *seq_list, u16 seq) 3793c588192SMat Martineau { 3803c588192SMat Martineau u16 mask = seq_list->mask; 3813c588192SMat Martineau 3823c588192SMat Martineau /* All appends happen in constant time */ 3833c588192SMat Martineau 384f522ae36SGustavo Padovan if (seq_list->list[seq & mask] != L2CAP_SEQ_LIST_CLEAR) 385f522ae36SGustavo Padovan return; 386f522ae36SGustavo Padovan 3873c588192SMat Martineau if (seq_list->tail == L2CAP_SEQ_LIST_CLEAR) 3883c588192SMat Martineau seq_list->head = seq; 3893c588192SMat Martineau else 3903c588192SMat Martineau seq_list->list[seq_list->tail & mask] = seq; 3913c588192SMat Martineau 3923c588192SMat Martineau seq_list->tail = seq; 3933c588192SMat Martineau seq_list->list[seq & mask] = L2CAP_SEQ_LIST_TAIL; 3943c588192SMat Martineau } 3953c588192SMat Martineau 396721c4181SGustavo F. Padovan static void l2cap_chan_timeout(struct work_struct *work) 397ab07801dSGustavo F. Padovan { 398721c4181SGustavo F. Padovan struct l2cap_chan *chan = container_of(work, struct l2cap_chan, 399721c4181SGustavo F. Padovan chan_timer.work); 4003df91ea2SAndrei Emeltchenko struct l2cap_conn *conn = chan->conn; 401ab07801dSGustavo F. Padovan int reason; 402ab07801dSGustavo F. Padovan 403e05dcc32SAndrei Emeltchenko BT_DBG("chan %p state %s", chan, state_to_string(chan->state)); 404ab07801dSGustavo F. Padovan 4053df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 4066be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 407ab07801dSGustavo F. Padovan 40889bc500eSGustavo F. Padovan if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG) 409ab07801dSGustavo F. Padovan reason = ECONNREFUSED; 41089bc500eSGustavo F. Padovan else if (chan->state == BT_CONNECT && 411ab07801dSGustavo F. Padovan chan->sec_level != BT_SECURITY_SDP) 412ab07801dSGustavo F. Padovan reason = ECONNREFUSED; 413ab07801dSGustavo F. Padovan else 414ab07801dSGustavo F. Padovan reason = ETIMEDOUT; 415ab07801dSGustavo F. Padovan 4160f852724SGustavo F. Padovan l2cap_chan_close(chan, reason); 417ab07801dSGustavo F. Padovan 4186be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 419ab07801dSGustavo F. Padovan 42080b98027SGustavo Padovan chan->ops->close(chan); 4213df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 4223df91ea2SAndrei Emeltchenko 423371fd835SUlisses Furquim l2cap_chan_put(chan); 424ab07801dSGustavo F. Padovan } 425ab07801dSGustavo F. Padovan 426eef1d9b6SGustavo Padovan struct l2cap_chan *l2cap_chan_create(void) 4270a708f8fSGustavo F. Padovan { 42848454079SGustavo F. Padovan struct l2cap_chan *chan; 4290a708f8fSGustavo F. Padovan 43048454079SGustavo F. Padovan chan = kzalloc(sizeof(*chan), GFP_ATOMIC); 43148454079SGustavo F. Padovan if (!chan) 43248454079SGustavo F. Padovan return NULL; 4330a708f8fSGustavo F. Padovan 434c03b355eSAndrei Emeltchenko mutex_init(&chan->lock); 435c03b355eSAndrei Emeltchenko 436333055f2SGustavo F. Padovan write_lock(&chan_list_lock); 43723691d75SGustavo F. Padovan list_add(&chan->global_l, &chan_list); 438333055f2SGustavo F. Padovan write_unlock(&chan_list_lock); 43923691d75SGustavo F. Padovan 440721c4181SGustavo F. Padovan INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout); 441ab07801dSGustavo F. Padovan 44289bc500eSGustavo F. Padovan chan->state = BT_OPEN; 44389bc500eSGustavo F. Padovan 444144ad330SSyam Sidhardhan kref_init(&chan->kref); 44571ba0e56SGustavo F. Padovan 4462827011fSMat Martineau /* This flag is cleared in l2cap_chan_ready() */ 4472827011fSMat Martineau set_bit(CONF_NOT_COMPLETE, &chan->conf_state); 4482827011fSMat Martineau 449eef1d9b6SGustavo Padovan BT_DBG("chan %p", chan); 450abc545b8SSzymon Janc 45148454079SGustavo F. Padovan return chan; 4520a708f8fSGustavo F. Padovan } 4530a708f8fSGustavo F. Padovan 454144ad330SSyam Sidhardhan static void l2cap_chan_destroy(struct kref *kref) 4556ff5abbfSGustavo F. Padovan { 456144ad330SSyam Sidhardhan struct l2cap_chan *chan = container_of(kref, struct l2cap_chan, kref); 457144ad330SSyam Sidhardhan 4584af66c69SJaganath Kanakkassery BT_DBG("chan %p", chan); 4594af66c69SJaganath Kanakkassery 460333055f2SGustavo F. Padovan write_lock(&chan_list_lock); 46123691d75SGustavo F. Padovan list_del(&chan->global_l); 462333055f2SGustavo F. Padovan write_unlock(&chan_list_lock); 46323691d75SGustavo F. Padovan 4644af66c69SJaganath Kanakkassery kfree(chan); 4656ff5abbfSGustavo F. Padovan } 4666ff5abbfSGustavo F. Padovan 46730648372SJaganath Kanakkassery void l2cap_chan_hold(struct l2cap_chan *c) 46830648372SJaganath Kanakkassery { 469144ad330SSyam Sidhardhan BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount)); 47030648372SJaganath Kanakkassery 471144ad330SSyam Sidhardhan kref_get(&c->kref); 47230648372SJaganath Kanakkassery } 47330648372SJaganath Kanakkassery 47430648372SJaganath Kanakkassery void l2cap_chan_put(struct l2cap_chan *c) 47530648372SJaganath Kanakkassery { 476144ad330SSyam Sidhardhan BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount)); 47730648372SJaganath Kanakkassery 478144ad330SSyam Sidhardhan kref_put(&c->kref, l2cap_chan_destroy); 47930648372SJaganath Kanakkassery } 48030648372SJaganath Kanakkassery 481bd4b1653SAndrei Emeltchenko void l2cap_chan_set_defaults(struct l2cap_chan *chan) 482bd4b1653SAndrei Emeltchenko { 483bd4b1653SAndrei Emeltchenko chan->fcs = L2CAP_FCS_CRC16; 484bd4b1653SAndrei Emeltchenko chan->max_tx = L2CAP_DEFAULT_MAX_TX; 485bd4b1653SAndrei Emeltchenko chan->tx_win = L2CAP_DEFAULT_TX_WINDOW; 486bd4b1653SAndrei Emeltchenko chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; 487c20f8e35SMat Martineau chan->ack_win = L2CAP_DEFAULT_TX_WINDOW; 488bd4b1653SAndrei Emeltchenko chan->sec_level = BT_SECURITY_LOW; 489bd4b1653SAndrei Emeltchenko 490bd4b1653SAndrei Emeltchenko set_bit(FLAG_FORCE_ACTIVE, &chan->flags); 491bd4b1653SAndrei Emeltchenko } 492bd4b1653SAndrei Emeltchenko 49393c3e8f5SAndrei Emeltchenko void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) 4940a708f8fSGustavo F. Padovan { 4950a708f8fSGustavo F. Padovan BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, 496097db76cSAndrei Emeltchenko __le16_to_cpu(chan->psm), chan->dcid); 4970a708f8fSGustavo F. Padovan 4989f5a0d7bSAndrei Emeltchenko conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; 4990a708f8fSGustavo F. Padovan 5008c1d787bSGustavo F. Padovan chan->conn = conn; 5010a708f8fSGustavo F. Padovan 5025491120eSAndrei Emeltchenko switch (chan->chan_type) { 5035491120eSAndrei Emeltchenko case L2CAP_CHAN_CONN_ORIENTED: 504b62f328bSVille Tervo if (conn->hcon->type == LE_LINK) { 505b62f328bSVille Tervo /* LE connection */ 5066fcb06a2SAndre Guedes chan->omtu = L2CAP_DEFAULT_MTU; 507fe4128e0SGustavo F. Padovan chan->scid = L2CAP_CID_LE_DATA; 508fe4128e0SGustavo F. Padovan chan->dcid = L2CAP_CID_LE_DATA; 509b62f328bSVille Tervo } else { 5100a708f8fSGustavo F. Padovan /* Alloc CID for connection-oriented socket */ 511fe4128e0SGustavo F. Padovan chan->scid = l2cap_alloc_cid(conn); 5120c1bc5c6SGustavo F. Padovan chan->omtu = L2CAP_DEFAULT_MTU; 513b62f328bSVille Tervo } 5145491120eSAndrei Emeltchenko break; 5155491120eSAndrei Emeltchenko 5165491120eSAndrei Emeltchenko case L2CAP_CHAN_CONN_LESS: 5170a708f8fSGustavo F. Padovan /* Connectionless socket */ 518fe4128e0SGustavo F. Padovan chan->scid = L2CAP_CID_CONN_LESS; 519fe4128e0SGustavo F. Padovan chan->dcid = L2CAP_CID_CONN_LESS; 5200c1bc5c6SGustavo F. Padovan chan->omtu = L2CAP_DEFAULT_MTU; 5215491120eSAndrei Emeltchenko break; 5225491120eSAndrei Emeltchenko 523416fa752SAndrei Emeltchenko case L2CAP_CHAN_CONN_FIX_A2MP: 524416fa752SAndrei Emeltchenko chan->scid = L2CAP_CID_A2MP; 525416fa752SAndrei Emeltchenko chan->dcid = L2CAP_CID_A2MP; 526416fa752SAndrei Emeltchenko chan->omtu = L2CAP_A2MP_DEFAULT_MTU; 527416fa752SAndrei Emeltchenko chan->imtu = L2CAP_A2MP_DEFAULT_MTU; 528416fa752SAndrei Emeltchenko break; 529416fa752SAndrei Emeltchenko 5305491120eSAndrei Emeltchenko default: 5310a708f8fSGustavo F. Padovan /* Raw socket can send/recv signalling messages only */ 532fe4128e0SGustavo F. Padovan chan->scid = L2CAP_CID_SIGNALING; 533fe4128e0SGustavo F. Padovan chan->dcid = L2CAP_CID_SIGNALING; 5340c1bc5c6SGustavo F. Padovan chan->omtu = L2CAP_DEFAULT_MTU; 5350a708f8fSGustavo F. Padovan } 5360a708f8fSGustavo F. Padovan 5378f7975b1SAndrei Emeltchenko chan->local_id = L2CAP_BESTEFFORT_ID; 5388f7975b1SAndrei Emeltchenko chan->local_stype = L2CAP_SERV_BESTEFFORT; 5398f7975b1SAndrei Emeltchenko chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE; 5408f7975b1SAndrei Emeltchenko chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME; 5418f7975b1SAndrei Emeltchenko chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT; 5428936fa6dSAndrei Emeltchenko chan->local_flush_to = L2CAP_EFS_DEFAULT_FLUSH_TO; 5438f7975b1SAndrei Emeltchenko 544371fd835SUlisses Furquim l2cap_chan_hold(chan); 545baa7e1faSGustavo F. Padovan 5463df91ea2SAndrei Emeltchenko list_add(&chan->list, &conn->chan_l); 547643162a8SAndrei Emeltchenko } 548643162a8SAndrei Emeltchenko 549466f8004SAndrei Emeltchenko void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) 550643162a8SAndrei Emeltchenko { 551643162a8SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 552643162a8SAndrei Emeltchenko __l2cap_chan_add(conn, chan); 5533df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 5540a708f8fSGustavo F. Padovan } 5550a708f8fSGustavo F. Padovan 556466f8004SAndrei Emeltchenko void l2cap_chan_del(struct l2cap_chan *chan, int err) 5570a708f8fSGustavo F. Padovan { 5588c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 5590a708f8fSGustavo F. Padovan 560c9b66675SGustavo F. Padovan __clear_chan_timer(chan); 5610a708f8fSGustavo F. Padovan 56249208c9cSGustavo F. Padovan BT_DBG("chan %p, conn %p, err %d", chan, conn, err); 5630a708f8fSGustavo F. Padovan 5640a708f8fSGustavo F. Padovan if (conn) { 56556f60984SAndrei Emeltchenko struct amp_mgr *mgr = conn->hcon->amp_mgr; 566baa7e1faSGustavo F. Padovan /* Delete from channel list */ 5673df91ea2SAndrei Emeltchenko list_del(&chan->list); 5683d57dc68SGustavo F. Padovan 569371fd835SUlisses Furquim l2cap_chan_put(chan); 570baa7e1faSGustavo F. Padovan 5718c1d787bSGustavo F. Padovan chan->conn = NULL; 5723cabbfdaSAndrei Emeltchenko 5733cabbfdaSAndrei Emeltchenko if (chan->chan_type != L2CAP_CHAN_CONN_FIX_A2MP) 5740a708f8fSGustavo F. Padovan hci_conn_put(conn->hcon); 57556f60984SAndrei Emeltchenko 57656f60984SAndrei Emeltchenko if (mgr && mgr->bredr_chan == chan) 57756f60984SAndrei Emeltchenko mgr->bredr_chan = NULL; 5780a708f8fSGustavo F. Padovan } 5790a708f8fSGustavo F. Padovan 580419e08c1SAndrei Emeltchenko if (chan->hs_hchan) { 581419e08c1SAndrei Emeltchenko struct hci_chan *hs_hchan = chan->hs_hchan; 582419e08c1SAndrei Emeltchenko 583419e08c1SAndrei Emeltchenko BT_DBG("chan %p disconnect hs_hchan %p", chan, hs_hchan); 584419e08c1SAndrei Emeltchenko amp_disconnect_logical_link(hs_hchan); 585419e08c1SAndrei Emeltchenko } 586419e08c1SAndrei Emeltchenko 587c0df7f6eSAndrei Emeltchenko chan->ops->teardown(chan, err); 5886be36555SAndrei Emeltchenko 5892827011fSMat Martineau if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state)) 5906ff5abbfSGustavo F. Padovan return; 5912ead70b8SGustavo F. Padovan 592ee556f66SGustavo Padovan switch(chan->mode) { 593ee556f66SGustavo Padovan case L2CAP_MODE_BASIC: 594ee556f66SGustavo Padovan break; 5950a708f8fSGustavo F. Padovan 596ee556f66SGustavo Padovan case L2CAP_MODE_ERTM: 5971a09bcb9SGustavo F. Padovan __clear_retrans_timer(chan); 5981a09bcb9SGustavo F. Padovan __clear_monitor_timer(chan); 5991a09bcb9SGustavo F. Padovan __clear_ack_timer(chan); 6000a708f8fSGustavo F. Padovan 601f1c6775bSGustavo F. Padovan skb_queue_purge(&chan->srej_q); 6020a708f8fSGustavo F. Padovan 6033c588192SMat Martineau l2cap_seq_list_free(&chan->srej_list); 6043c588192SMat Martineau l2cap_seq_list_free(&chan->retrans_list); 605ee556f66SGustavo Padovan 606ee556f66SGustavo Padovan /* fall through */ 607ee556f66SGustavo Padovan 608ee556f66SGustavo Padovan case L2CAP_MODE_STREAMING: 609ee556f66SGustavo Padovan skb_queue_purge(&chan->tx_q); 610ee556f66SGustavo Padovan break; 6110a708f8fSGustavo F. Padovan } 612ee556f66SGustavo Padovan 613ee556f66SGustavo Padovan return; 6140a708f8fSGustavo F. Padovan } 6150a708f8fSGustavo F. Padovan 6160f852724SGustavo F. Padovan void l2cap_chan_close(struct l2cap_chan *chan, int reason) 6174519de9aSGustavo F. Padovan { 6184519de9aSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 6194519de9aSGustavo F. Padovan struct sock *sk = chan->sk; 6204519de9aSGustavo F. Padovan 6212d792818SGustavo Padovan BT_DBG("chan %p state %s sk %p", chan, state_to_string(chan->state), 6222d792818SGustavo Padovan sk); 6234519de9aSGustavo F. Padovan 62489bc500eSGustavo F. Padovan switch (chan->state) { 6254519de9aSGustavo F. Padovan case BT_LISTEN: 626c0df7f6eSAndrei Emeltchenko chan->ops->teardown(chan, 0); 6274519de9aSGustavo F. Padovan break; 6284519de9aSGustavo F. Padovan 6294519de9aSGustavo F. Padovan case BT_CONNECTED: 6304519de9aSGustavo F. Padovan case BT_CONFIG: 631715ec005SGustavo F. Padovan if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && 6324519de9aSGustavo F. Padovan conn->hcon->type == ACL_LINK) { 633c9b66675SGustavo F. Padovan __set_chan_timer(chan, sk->sk_sndtimeo); 6345e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, reason); 6354519de9aSGustavo F. Padovan } else 6364519de9aSGustavo F. Padovan l2cap_chan_del(chan, reason); 6374519de9aSGustavo F. Padovan break; 6384519de9aSGustavo F. Padovan 6394519de9aSGustavo F. Padovan case BT_CONNECT2: 640715ec005SGustavo F. Padovan if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && 6414519de9aSGustavo F. Padovan conn->hcon->type == ACL_LINK) { 6424519de9aSGustavo F. Padovan struct l2cap_conn_rsp rsp; 6434519de9aSGustavo F. Padovan __u16 result; 6444519de9aSGustavo F. Padovan 645c5daa683SGustavo Padovan if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) 6464519de9aSGustavo F. Padovan result = L2CAP_CR_SEC_BLOCK; 6474519de9aSGustavo F. Padovan else 6484519de9aSGustavo F. Padovan result = L2CAP_CR_BAD_PSM; 64989bc500eSGustavo F. Padovan l2cap_state_change(chan, BT_DISCONN); 6504519de9aSGustavo F. Padovan 6514519de9aSGustavo F. Padovan rsp.scid = cpu_to_le16(chan->dcid); 6524519de9aSGustavo F. Padovan rsp.dcid = cpu_to_le16(chan->scid); 6534519de9aSGustavo F. Padovan rsp.result = cpu_to_le16(result); 654ac73498cSAndrei Emeltchenko rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); 6554519de9aSGustavo F. Padovan l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, 6564519de9aSGustavo F. Padovan sizeof(rsp), &rsp); 6574519de9aSGustavo F. Padovan } 6584519de9aSGustavo F. Padovan 6594519de9aSGustavo F. Padovan l2cap_chan_del(chan, reason); 6604519de9aSGustavo F. Padovan break; 6614519de9aSGustavo F. Padovan 6624519de9aSGustavo F. Padovan case BT_CONNECT: 6634519de9aSGustavo F. Padovan case BT_DISCONN: 6644519de9aSGustavo F. Padovan l2cap_chan_del(chan, reason); 6654519de9aSGustavo F. Padovan break; 6664519de9aSGustavo F. Padovan 6674519de9aSGustavo F. Padovan default: 668c0df7f6eSAndrei Emeltchenko chan->ops->teardown(chan, 0); 6694519de9aSGustavo F. Padovan break; 6704519de9aSGustavo F. Padovan } 6714519de9aSGustavo F. Padovan } 6724519de9aSGustavo F. Padovan 6734343478fSGustavo F. Padovan static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan) 6740a708f8fSGustavo F. Padovan { 675715ec005SGustavo F. Padovan if (chan->chan_type == L2CAP_CHAN_RAW) { 6764343478fSGustavo F. Padovan switch (chan->sec_level) { 6770a708f8fSGustavo F. Padovan case BT_SECURITY_HIGH: 6780a708f8fSGustavo F. Padovan return HCI_AT_DEDICATED_BONDING_MITM; 6790a708f8fSGustavo F. Padovan case BT_SECURITY_MEDIUM: 6800a708f8fSGustavo F. Padovan return HCI_AT_DEDICATED_BONDING; 6810a708f8fSGustavo F. Padovan default: 6820a708f8fSGustavo F. Padovan return HCI_AT_NO_BONDING; 6830a708f8fSGustavo F. Padovan } 6842983fd68SAndrei Emeltchenko } else if (chan->psm == __constant_cpu_to_le16(L2CAP_PSM_SDP)) { 6854343478fSGustavo F. Padovan if (chan->sec_level == BT_SECURITY_LOW) 6864343478fSGustavo F. Padovan chan->sec_level = BT_SECURITY_SDP; 6870a708f8fSGustavo F. Padovan 6884343478fSGustavo F. Padovan if (chan->sec_level == BT_SECURITY_HIGH) 6890a708f8fSGustavo F. Padovan return HCI_AT_NO_BONDING_MITM; 6900a708f8fSGustavo F. Padovan else 6910a708f8fSGustavo F. Padovan return HCI_AT_NO_BONDING; 6920a708f8fSGustavo F. Padovan } else { 6934343478fSGustavo F. Padovan switch (chan->sec_level) { 6940a708f8fSGustavo F. Padovan case BT_SECURITY_HIGH: 6950a708f8fSGustavo F. Padovan return HCI_AT_GENERAL_BONDING_MITM; 6960a708f8fSGustavo F. Padovan case BT_SECURITY_MEDIUM: 6970a708f8fSGustavo F. Padovan return HCI_AT_GENERAL_BONDING; 6980a708f8fSGustavo F. Padovan default: 6990a708f8fSGustavo F. Padovan return HCI_AT_NO_BONDING; 7000a708f8fSGustavo F. Padovan } 7010a708f8fSGustavo F. Padovan } 7020a708f8fSGustavo F. Padovan } 7030a708f8fSGustavo F. Padovan 7040a708f8fSGustavo F. Padovan /* Service level security */ 705d45fc423SGustavo F. Padovan int l2cap_chan_check_security(struct l2cap_chan *chan) 7060a708f8fSGustavo F. Padovan { 7078c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 7080a708f8fSGustavo F. Padovan __u8 auth_type; 7090a708f8fSGustavo F. Padovan 7104343478fSGustavo F. Padovan auth_type = l2cap_get_auth_type(chan); 7110a708f8fSGustavo F. Padovan 7124343478fSGustavo F. Padovan return hci_conn_security(conn->hcon, chan->sec_level, auth_type); 7130a708f8fSGustavo F. Padovan } 7140a708f8fSGustavo F. Padovan 715b5ad8b7fSJohannes Berg static u8 l2cap_get_ident(struct l2cap_conn *conn) 7160a708f8fSGustavo F. Padovan { 7170a708f8fSGustavo F. Padovan u8 id; 7180a708f8fSGustavo F. Padovan 7190a708f8fSGustavo F. Padovan /* Get next available identificator. 7200a708f8fSGustavo F. Padovan * 1 - 128 are used by kernel. 7210a708f8fSGustavo F. Padovan * 129 - 199 are reserved. 7220a708f8fSGustavo F. Padovan * 200 - 254 are used by utilities like l2ping, etc. 7230a708f8fSGustavo F. Padovan */ 7240a708f8fSGustavo F. Padovan 725333055f2SGustavo F. Padovan spin_lock(&conn->lock); 7260a708f8fSGustavo F. Padovan 7270a708f8fSGustavo F. Padovan if (++conn->tx_ident > 128) 7280a708f8fSGustavo F. Padovan conn->tx_ident = 1; 7290a708f8fSGustavo F. Padovan 7300a708f8fSGustavo F. Padovan id = conn->tx_ident; 7310a708f8fSGustavo F. Padovan 732333055f2SGustavo F. Padovan spin_unlock(&conn->lock); 7330a708f8fSGustavo F. Padovan 7340a708f8fSGustavo F. Padovan return id; 7350a708f8fSGustavo F. Padovan } 7360a708f8fSGustavo F. Padovan 7372d792818SGustavo Padovan static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, 7382d792818SGustavo Padovan void *data) 7390a708f8fSGustavo F. Padovan { 7400a708f8fSGustavo F. Padovan struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); 7410a708f8fSGustavo F. Padovan u8 flags; 7420a708f8fSGustavo F. Padovan 7430a708f8fSGustavo F. Padovan BT_DBG("code 0x%2.2x", code); 7440a708f8fSGustavo F. Padovan 7450a708f8fSGustavo F. Padovan if (!skb) 7460a708f8fSGustavo F. Padovan return; 7470a708f8fSGustavo F. Padovan 7480a708f8fSGustavo F. Padovan if (lmp_no_flush_capable(conn->hcon->hdev)) 7490a708f8fSGustavo F. Padovan flags = ACL_START_NO_FLUSH; 7500a708f8fSGustavo F. Padovan else 7510a708f8fSGustavo F. Padovan flags = ACL_START; 7520a708f8fSGustavo F. Padovan 75314b12d0bSJaikumar Ganesh bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON; 7545e59b791SLuiz Augusto von Dentz skb->priority = HCI_PRIO_MAX; 75514b12d0bSJaikumar Ganesh 75673d80debSLuiz Augusto von Dentz hci_send_acl(conn->hchan, skb, flags); 7570a708f8fSGustavo F. Padovan } 7580a708f8fSGustavo F. Padovan 75902b0fbb9SMat Martineau static bool __chan_is_moving(struct l2cap_chan *chan) 76002b0fbb9SMat Martineau { 76102b0fbb9SMat Martineau return chan->move_state != L2CAP_MOVE_STABLE && 76202b0fbb9SMat Martineau chan->move_state != L2CAP_MOVE_WAIT_PREPARE; 76302b0fbb9SMat Martineau } 76402b0fbb9SMat Martineau 76573d80debSLuiz Augusto von Dentz static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb) 76673d80debSLuiz Augusto von Dentz { 76773d80debSLuiz Augusto von Dentz struct hci_conn *hcon = chan->conn->hcon; 76873d80debSLuiz Augusto von Dentz u16 flags; 76973d80debSLuiz Augusto von Dentz 77073d80debSLuiz Augusto von Dentz BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len, 77173d80debSLuiz Augusto von Dentz skb->priority); 77273d80debSLuiz Augusto von Dentz 773d5f8a75dSMat Martineau if (chan->hs_hcon && !__chan_is_moving(chan)) { 774d5f8a75dSMat Martineau if (chan->hs_hchan) 775d5f8a75dSMat Martineau hci_send_acl(chan->hs_hchan, skb, ACL_COMPLETE); 776d5f8a75dSMat Martineau else 777d5f8a75dSMat Martineau kfree_skb(skb); 778d5f8a75dSMat Martineau 779d5f8a75dSMat Martineau return; 780d5f8a75dSMat Martineau } 781d5f8a75dSMat Martineau 78273d80debSLuiz Augusto von Dentz if (!test_bit(FLAG_FLUSHABLE, &chan->flags) && 78373d80debSLuiz Augusto von Dentz lmp_no_flush_capable(hcon->hdev)) 78473d80debSLuiz Augusto von Dentz flags = ACL_START_NO_FLUSH; 78573d80debSLuiz Augusto von Dentz else 78673d80debSLuiz Augusto von Dentz flags = ACL_START; 78773d80debSLuiz Augusto von Dentz 78873d80debSLuiz Augusto von Dentz bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags); 78973d80debSLuiz Augusto von Dentz hci_send_acl(chan->conn->hchan, skb, flags); 7900a708f8fSGustavo F. Padovan } 7910a708f8fSGustavo F. Padovan 792b5c6aaedSMat Martineau static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control) 793b5c6aaedSMat Martineau { 794b5c6aaedSMat Martineau control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT; 795b5c6aaedSMat Martineau control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT; 796b5c6aaedSMat Martineau 797b5c6aaedSMat Martineau if (enh & L2CAP_CTRL_FRAME_TYPE) { 798b5c6aaedSMat Martineau /* S-Frame */ 799b5c6aaedSMat Martineau control->sframe = 1; 800b5c6aaedSMat Martineau control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT; 801b5c6aaedSMat Martineau control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT; 802b5c6aaedSMat Martineau 803b5c6aaedSMat Martineau control->sar = 0; 804b5c6aaedSMat Martineau control->txseq = 0; 805b5c6aaedSMat Martineau } else { 806b5c6aaedSMat Martineau /* I-Frame */ 807b5c6aaedSMat Martineau control->sframe = 0; 808b5c6aaedSMat Martineau control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT; 809b5c6aaedSMat Martineau control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT; 810b5c6aaedSMat Martineau 811b5c6aaedSMat Martineau control->poll = 0; 812b5c6aaedSMat Martineau control->super = 0; 813b5c6aaedSMat Martineau } 814b5c6aaedSMat Martineau } 815b5c6aaedSMat Martineau 816b5c6aaedSMat Martineau static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control) 817b5c6aaedSMat Martineau { 818b5c6aaedSMat Martineau control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT; 819b5c6aaedSMat Martineau control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT; 820b5c6aaedSMat Martineau 821b5c6aaedSMat Martineau if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) { 822b5c6aaedSMat Martineau /* S-Frame */ 823b5c6aaedSMat Martineau control->sframe = 1; 824b5c6aaedSMat Martineau control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT; 825b5c6aaedSMat Martineau control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT; 826b5c6aaedSMat Martineau 827b5c6aaedSMat Martineau control->sar = 0; 828b5c6aaedSMat Martineau control->txseq = 0; 829b5c6aaedSMat Martineau } else { 830b5c6aaedSMat Martineau /* I-Frame */ 831b5c6aaedSMat Martineau control->sframe = 0; 832b5c6aaedSMat Martineau control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT; 833b5c6aaedSMat Martineau control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT; 834b5c6aaedSMat Martineau 835b5c6aaedSMat Martineau control->poll = 0; 836b5c6aaedSMat Martineau control->super = 0; 837b5c6aaedSMat Martineau } 838b5c6aaedSMat Martineau } 839b5c6aaedSMat Martineau 840b5c6aaedSMat Martineau static inline void __unpack_control(struct l2cap_chan *chan, 841b5c6aaedSMat Martineau struct sk_buff *skb) 842b5c6aaedSMat Martineau { 843b5c6aaedSMat Martineau if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { 844b5c6aaedSMat Martineau __unpack_extended_control(get_unaligned_le32(skb->data), 845b5c6aaedSMat Martineau &bt_cb(skb)->control); 846cec8ab6eSMat Martineau skb_pull(skb, L2CAP_EXT_CTRL_SIZE); 847b5c6aaedSMat Martineau } else { 848b5c6aaedSMat Martineau __unpack_enhanced_control(get_unaligned_le16(skb->data), 849b5c6aaedSMat Martineau &bt_cb(skb)->control); 850cec8ab6eSMat Martineau skb_pull(skb, L2CAP_ENH_CTRL_SIZE); 851b5c6aaedSMat Martineau } 852b5c6aaedSMat Martineau } 853b5c6aaedSMat Martineau 854b5c6aaedSMat Martineau static u32 __pack_extended_control(struct l2cap_ctrl *control) 855b5c6aaedSMat Martineau { 856b5c6aaedSMat Martineau u32 packed; 857b5c6aaedSMat Martineau 858b5c6aaedSMat Martineau packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT; 859b5c6aaedSMat Martineau packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT; 860b5c6aaedSMat Martineau 861b5c6aaedSMat Martineau if (control->sframe) { 862b5c6aaedSMat Martineau packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT; 863b5c6aaedSMat Martineau packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT; 864b5c6aaedSMat Martineau packed |= L2CAP_EXT_CTRL_FRAME_TYPE; 865b5c6aaedSMat Martineau } else { 866b5c6aaedSMat Martineau packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT; 867b5c6aaedSMat Martineau packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT; 868b5c6aaedSMat Martineau } 869b5c6aaedSMat Martineau 870b5c6aaedSMat Martineau return packed; 871b5c6aaedSMat Martineau } 872b5c6aaedSMat Martineau 873b5c6aaedSMat Martineau static u16 __pack_enhanced_control(struct l2cap_ctrl *control) 874b5c6aaedSMat Martineau { 875b5c6aaedSMat Martineau u16 packed; 876b5c6aaedSMat Martineau 877b5c6aaedSMat Martineau packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT; 878b5c6aaedSMat Martineau packed |= control->final << L2CAP_CTRL_FINAL_SHIFT; 879b5c6aaedSMat Martineau 880b5c6aaedSMat Martineau if (control->sframe) { 881b5c6aaedSMat Martineau packed |= control->poll << L2CAP_CTRL_POLL_SHIFT; 882b5c6aaedSMat Martineau packed |= control->super << L2CAP_CTRL_SUPER_SHIFT; 883b5c6aaedSMat Martineau packed |= L2CAP_CTRL_FRAME_TYPE; 884b5c6aaedSMat Martineau } else { 885b5c6aaedSMat Martineau packed |= control->sar << L2CAP_CTRL_SAR_SHIFT; 886b5c6aaedSMat Martineau packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT; 887b5c6aaedSMat Martineau } 888b5c6aaedSMat Martineau 889b5c6aaedSMat Martineau return packed; 890b5c6aaedSMat Martineau } 891b5c6aaedSMat Martineau 892b5c6aaedSMat Martineau static inline void __pack_control(struct l2cap_chan *chan, 893b5c6aaedSMat Martineau struct l2cap_ctrl *control, 894b5c6aaedSMat Martineau struct sk_buff *skb) 895b5c6aaedSMat Martineau { 896b5c6aaedSMat Martineau if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { 897b5c6aaedSMat Martineau put_unaligned_le32(__pack_extended_control(control), 898b5c6aaedSMat Martineau skb->data + L2CAP_HDR_SIZE); 899b5c6aaedSMat Martineau } else { 900b5c6aaedSMat Martineau put_unaligned_le16(__pack_enhanced_control(control), 901b5c6aaedSMat Martineau skb->data + L2CAP_HDR_SIZE); 902b5c6aaedSMat Martineau } 903b5c6aaedSMat Martineau } 904b5c6aaedSMat Martineau 905ba7aa64fSGustavo Padovan static inline unsigned int __ertm_hdr_size(struct l2cap_chan *chan) 906ba7aa64fSGustavo Padovan { 907ba7aa64fSGustavo Padovan if (test_bit(FLAG_EXT_CTRL, &chan->flags)) 908ba7aa64fSGustavo Padovan return L2CAP_EXT_HDR_SIZE; 909ba7aa64fSGustavo Padovan else 910ba7aa64fSGustavo Padovan return L2CAP_ENH_HDR_SIZE; 911ba7aa64fSGustavo Padovan } 912ba7aa64fSGustavo Padovan 913a67d7f6fSMat Martineau static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan, 914a67d7f6fSMat Martineau u32 control) 9150a708f8fSGustavo F. Padovan { 9160a708f8fSGustavo F. Padovan struct sk_buff *skb; 9170a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 918ba7aa64fSGustavo Padovan int hlen = __ertm_hdr_size(chan); 9190a708f8fSGustavo F. Padovan 9200a708f8fSGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) 92103a51213SAndrei Emeltchenko hlen += L2CAP_FCS_SIZE; 9220a708f8fSGustavo F. Padovan 923a67d7f6fSMat Martineau skb = bt_skb_alloc(hlen, GFP_KERNEL); 9240a708f8fSGustavo F. Padovan 9250a708f8fSGustavo F. Padovan if (!skb) 926a67d7f6fSMat Martineau return ERR_PTR(-ENOMEM); 9270a708f8fSGustavo F. Padovan 9280a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 9290a708f8fSGustavo F. Padovan lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); 930fe4128e0SGustavo F. Padovan lh->cid = cpu_to_le16(chan->dcid); 93188843ab0SAndrei Emeltchenko 932a67d7f6fSMat Martineau if (test_bit(FLAG_EXT_CTRL, &chan->flags)) 933a67d7f6fSMat Martineau put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); 934a67d7f6fSMat Martineau else 935a67d7f6fSMat Martineau put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); 9360a708f8fSGustavo F. Padovan 93747d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) { 938a67d7f6fSMat Martineau u16 fcs = crc16(0, (u8 *)skb->data, skb->len); 93903a51213SAndrei Emeltchenko put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); 9400a708f8fSGustavo F. Padovan } 9410a708f8fSGustavo F. Padovan 94273d80debSLuiz Augusto von Dentz skb->priority = HCI_PRIO_MAX; 943a67d7f6fSMat Martineau return skb; 944a67d7f6fSMat Martineau } 945a67d7f6fSMat Martineau 946a67d7f6fSMat Martineau static void l2cap_send_sframe(struct l2cap_chan *chan, 947a67d7f6fSMat Martineau struct l2cap_ctrl *control) 948a67d7f6fSMat Martineau { 949a67d7f6fSMat Martineau struct sk_buff *skb; 950a67d7f6fSMat Martineau u32 control_field; 951a67d7f6fSMat Martineau 952a67d7f6fSMat Martineau BT_DBG("chan %p, control %p", chan, control); 953a67d7f6fSMat Martineau 954a67d7f6fSMat Martineau if (!control->sframe) 955a67d7f6fSMat Martineau return; 956a67d7f6fSMat Martineau 957b99e13adSMat Martineau if (__chan_is_moving(chan)) 958b99e13adSMat Martineau return; 959b99e13adSMat Martineau 960a67d7f6fSMat Martineau if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) && 961a67d7f6fSMat Martineau !control->poll) 962a67d7f6fSMat Martineau control->final = 1; 963a67d7f6fSMat Martineau 964a67d7f6fSMat Martineau if (control->super == L2CAP_SUPER_RR) 965a67d7f6fSMat Martineau clear_bit(CONN_RNR_SENT, &chan->conn_state); 966a67d7f6fSMat Martineau else if (control->super == L2CAP_SUPER_RNR) 967a67d7f6fSMat Martineau set_bit(CONN_RNR_SENT, &chan->conn_state); 968a67d7f6fSMat Martineau 969a67d7f6fSMat Martineau if (control->super != L2CAP_SUPER_SREJ) { 970a67d7f6fSMat Martineau chan->last_acked_seq = control->reqseq; 971a67d7f6fSMat Martineau __clear_ack_timer(chan); 972a67d7f6fSMat Martineau } 973a67d7f6fSMat Martineau 974a67d7f6fSMat Martineau BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq, 975a67d7f6fSMat Martineau control->final, control->poll, control->super); 976a67d7f6fSMat Martineau 977a67d7f6fSMat Martineau if (test_bit(FLAG_EXT_CTRL, &chan->flags)) 978a67d7f6fSMat Martineau control_field = __pack_extended_control(control); 979a67d7f6fSMat Martineau else 980a67d7f6fSMat Martineau control_field = __pack_enhanced_control(control); 981a67d7f6fSMat Martineau 982a67d7f6fSMat Martineau skb = l2cap_create_sframe_pdu(chan, control_field); 983a67d7f6fSMat Martineau if (!IS_ERR(skb)) 98473d80debSLuiz Augusto von Dentz l2cap_do_send(chan, skb); 9850a708f8fSGustavo F. Padovan } 9860a708f8fSGustavo F. Padovan 987c9e3d5e0SMat Martineau static void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, bool poll) 9880a708f8fSGustavo F. Padovan { 989c9e3d5e0SMat Martineau struct l2cap_ctrl control; 9900a708f8fSGustavo F. Padovan 991c9e3d5e0SMat Martineau BT_DBG("chan %p, poll %d", chan, poll); 992c9e3d5e0SMat Martineau 993c9e3d5e0SMat Martineau memset(&control, 0, sizeof(control)); 994c9e3d5e0SMat Martineau control.sframe = 1; 995c9e3d5e0SMat Martineau control.poll = poll; 996c9e3d5e0SMat Martineau 997c9e3d5e0SMat Martineau if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) 998c9e3d5e0SMat Martineau control.super = L2CAP_SUPER_RNR; 999c9e3d5e0SMat Martineau else 1000c9e3d5e0SMat Martineau control.super = L2CAP_SUPER_RR; 1001c9e3d5e0SMat Martineau 1002c9e3d5e0SMat Martineau control.reqseq = chan->buffer_seq; 1003c9e3d5e0SMat Martineau l2cap_send_sframe(chan, &control); 10040a708f8fSGustavo F. Padovan } 10050a708f8fSGustavo F. Padovan 1006b4450035SGustavo F. Padovan static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan) 10070a708f8fSGustavo F. Padovan { 1008c1360a1cSGustavo F. Padovan return !test_bit(CONF_CONNECT_PEND, &chan->conf_state); 10090a708f8fSGustavo F. Padovan } 10100a708f8fSGustavo F. Padovan 101193c3e8f5SAndrei Emeltchenko static bool __amp_capable(struct l2cap_chan *chan) 101293c3e8f5SAndrei Emeltchenko { 101393c3e8f5SAndrei Emeltchenko struct l2cap_conn *conn = chan->conn; 101493c3e8f5SAndrei Emeltchenko 101593c3e8f5SAndrei Emeltchenko if (enable_hs && 10165d05416eSAndrei Emeltchenko hci_amp_capable() && 101793c3e8f5SAndrei Emeltchenko chan->chan_policy == BT_CHANNEL_POLICY_AMP_PREFERRED && 101893c3e8f5SAndrei Emeltchenko conn->fixed_chan_mask & L2CAP_FC_A2MP) 101993c3e8f5SAndrei Emeltchenko return true; 102093c3e8f5SAndrei Emeltchenko else 102193c3e8f5SAndrei Emeltchenko return false; 102293c3e8f5SAndrei Emeltchenko } 102393c3e8f5SAndrei Emeltchenko 10245ce66b59SAndrei Emeltchenko static bool l2cap_check_efs(struct l2cap_chan *chan) 10255ce66b59SAndrei Emeltchenko { 10265ce66b59SAndrei Emeltchenko /* Check EFS parameters */ 10275ce66b59SAndrei Emeltchenko return true; 10285ce66b59SAndrei Emeltchenko } 10295ce66b59SAndrei Emeltchenko 10302766be48SAndrei Emeltchenko void l2cap_send_conn_req(struct l2cap_chan *chan) 10319b27f350SAndrei Emeltchenko { 10329b27f350SAndrei Emeltchenko struct l2cap_conn *conn = chan->conn; 10339b27f350SAndrei Emeltchenko struct l2cap_conn_req req; 10349b27f350SAndrei Emeltchenko 10359b27f350SAndrei Emeltchenko req.scid = cpu_to_le16(chan->scid); 10369b27f350SAndrei Emeltchenko req.psm = chan->psm; 10379b27f350SAndrei Emeltchenko 10389b27f350SAndrei Emeltchenko chan->ident = l2cap_get_ident(conn); 10399b27f350SAndrei Emeltchenko 10409b27f350SAndrei Emeltchenko set_bit(CONF_CONNECT_PEND, &chan->conf_state); 10419b27f350SAndrei Emeltchenko 10429b27f350SAndrei Emeltchenko l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req); 10439b27f350SAndrei Emeltchenko } 10449b27f350SAndrei Emeltchenko 10458eb200bdSMat Martineau static void l2cap_send_create_chan_req(struct l2cap_chan *chan, u8 amp_id) 10468eb200bdSMat Martineau { 10478eb200bdSMat Martineau struct l2cap_create_chan_req req; 10488eb200bdSMat Martineau req.scid = cpu_to_le16(chan->scid); 10498eb200bdSMat Martineau req.psm = chan->psm; 10508eb200bdSMat Martineau req.amp_id = amp_id; 10518eb200bdSMat Martineau 10528eb200bdSMat Martineau chan->ident = l2cap_get_ident(chan->conn); 10538eb200bdSMat Martineau 10548eb200bdSMat Martineau l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_REQ, 10558eb200bdSMat Martineau sizeof(req), &req); 10568eb200bdSMat Martineau } 10578eb200bdSMat Martineau 105802b0fbb9SMat Martineau static void l2cap_move_setup(struct l2cap_chan *chan) 105902b0fbb9SMat Martineau { 106002b0fbb9SMat Martineau struct sk_buff *skb; 106102b0fbb9SMat Martineau 106202b0fbb9SMat Martineau BT_DBG("chan %p", chan); 106302b0fbb9SMat Martineau 106402b0fbb9SMat Martineau if (chan->mode != L2CAP_MODE_ERTM) 106502b0fbb9SMat Martineau return; 106602b0fbb9SMat Martineau 106702b0fbb9SMat Martineau __clear_retrans_timer(chan); 106802b0fbb9SMat Martineau __clear_monitor_timer(chan); 106902b0fbb9SMat Martineau __clear_ack_timer(chan); 107002b0fbb9SMat Martineau 107102b0fbb9SMat Martineau chan->retry_count = 0; 107202b0fbb9SMat Martineau skb_queue_walk(&chan->tx_q, skb) { 107302b0fbb9SMat Martineau if (bt_cb(skb)->control.retries) 107402b0fbb9SMat Martineau bt_cb(skb)->control.retries = 1; 107502b0fbb9SMat Martineau else 107602b0fbb9SMat Martineau break; 107702b0fbb9SMat Martineau } 107802b0fbb9SMat Martineau 107902b0fbb9SMat Martineau chan->expected_tx_seq = chan->buffer_seq; 108002b0fbb9SMat Martineau 108102b0fbb9SMat Martineau clear_bit(CONN_REJ_ACT, &chan->conn_state); 108202b0fbb9SMat Martineau clear_bit(CONN_SREJ_ACT, &chan->conn_state); 108302b0fbb9SMat Martineau l2cap_seq_list_clear(&chan->retrans_list); 108402b0fbb9SMat Martineau l2cap_seq_list_clear(&chan->srej_list); 108502b0fbb9SMat Martineau skb_queue_purge(&chan->srej_q); 108602b0fbb9SMat Martineau 108702b0fbb9SMat Martineau chan->tx_state = L2CAP_TX_STATE_XMIT; 108802b0fbb9SMat Martineau chan->rx_state = L2CAP_RX_STATE_MOVE; 108902b0fbb9SMat Martineau 109002b0fbb9SMat Martineau set_bit(CONN_REMOTE_BUSY, &chan->conn_state); 109102b0fbb9SMat Martineau } 109202b0fbb9SMat Martineau 10935f3847a4SMat Martineau static void l2cap_move_done(struct l2cap_chan *chan) 10945f3847a4SMat Martineau { 10955f3847a4SMat Martineau u8 move_role = chan->move_role; 10965f3847a4SMat Martineau BT_DBG("chan %p", chan); 10975f3847a4SMat Martineau 10985f3847a4SMat Martineau chan->move_state = L2CAP_MOVE_STABLE; 10995f3847a4SMat Martineau chan->move_role = L2CAP_MOVE_ROLE_NONE; 11005f3847a4SMat Martineau 11015f3847a4SMat Martineau if (chan->mode != L2CAP_MODE_ERTM) 11025f3847a4SMat Martineau return; 11035f3847a4SMat Martineau 11045f3847a4SMat Martineau switch (move_role) { 11055f3847a4SMat Martineau case L2CAP_MOVE_ROLE_INITIATOR: 11065f3847a4SMat Martineau l2cap_tx(chan, NULL, NULL, L2CAP_EV_EXPLICIT_POLL); 11075f3847a4SMat Martineau chan->rx_state = L2CAP_RX_STATE_WAIT_F; 11085f3847a4SMat Martineau break; 11095f3847a4SMat Martineau case L2CAP_MOVE_ROLE_RESPONDER: 11105f3847a4SMat Martineau chan->rx_state = L2CAP_RX_STATE_WAIT_P; 11115f3847a4SMat Martineau break; 11125f3847a4SMat Martineau } 11135f3847a4SMat Martineau } 11145f3847a4SMat Martineau 11159f0caeb1SVinicius Costa Gomes static void l2cap_chan_ready(struct l2cap_chan *chan) 11169f0caeb1SVinicius Costa Gomes { 11172827011fSMat Martineau /* This clears all conf flags, including CONF_NOT_COMPLETE */ 11189f0caeb1SVinicius Costa Gomes chan->conf_state = 0; 11199f0caeb1SVinicius Costa Gomes __clear_chan_timer(chan); 11209f0caeb1SVinicius Costa Gomes 112154a59aa2SAndrei Emeltchenko chan->state = BT_CONNECTED; 11229f0caeb1SVinicius Costa Gomes 112354a59aa2SAndrei Emeltchenko chan->ops->ready(chan); 11249f0caeb1SVinicius Costa Gomes } 11259f0caeb1SVinicius Costa Gomes 112693c3e8f5SAndrei Emeltchenko static void l2cap_start_connection(struct l2cap_chan *chan) 112793c3e8f5SAndrei Emeltchenko { 112893c3e8f5SAndrei Emeltchenko if (__amp_capable(chan)) { 112993c3e8f5SAndrei Emeltchenko BT_DBG("chan %p AMP capable: discover AMPs", chan); 113093c3e8f5SAndrei Emeltchenko a2mp_discover_amp(chan); 113193c3e8f5SAndrei Emeltchenko } else { 113293c3e8f5SAndrei Emeltchenko l2cap_send_conn_req(chan); 113393c3e8f5SAndrei Emeltchenko } 113493c3e8f5SAndrei Emeltchenko } 113593c3e8f5SAndrei Emeltchenko 1136fc7f8a7eSGustavo F. Padovan static void l2cap_do_start(struct l2cap_chan *chan) 11370a708f8fSGustavo F. Padovan { 11388c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 11390a708f8fSGustavo F. Padovan 11409f0caeb1SVinicius Costa Gomes if (conn->hcon->type == LE_LINK) { 11419f0caeb1SVinicius Costa Gomes l2cap_chan_ready(chan); 11429f0caeb1SVinicius Costa Gomes return; 11439f0caeb1SVinicius Costa Gomes } 11449f0caeb1SVinicius Costa Gomes 11450a708f8fSGustavo F. Padovan if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { 11460a708f8fSGustavo F. Padovan if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) 11470a708f8fSGustavo F. Padovan return; 11480a708f8fSGustavo F. Padovan 1149d45fc423SGustavo F. Padovan if (l2cap_chan_check_security(chan) && 115093c3e8f5SAndrei Emeltchenko __l2cap_no_conn_pending(chan)) { 115193c3e8f5SAndrei Emeltchenko l2cap_start_connection(chan); 115293c3e8f5SAndrei Emeltchenko } 11530a708f8fSGustavo F. Padovan } else { 11540a708f8fSGustavo F. Padovan struct l2cap_info_req req; 1155ac73498cSAndrei Emeltchenko req.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); 11560a708f8fSGustavo F. Padovan 11570a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; 11580a708f8fSGustavo F. Padovan conn->info_ident = l2cap_get_ident(conn); 11590a708f8fSGustavo F. Padovan 1160ba13ccd9SMarcel Holtmann schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); 11610a708f8fSGustavo F. Padovan 11622d792818SGustavo Padovan l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ, 11632d792818SGustavo Padovan sizeof(req), &req); 11640a708f8fSGustavo F. Padovan } 11650a708f8fSGustavo F. Padovan } 11660a708f8fSGustavo F. Padovan 11670a708f8fSGustavo F. Padovan static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) 11680a708f8fSGustavo F. Padovan { 11690a708f8fSGustavo F. Padovan u32 local_feat_mask = l2cap_feat_mask; 11700a708f8fSGustavo F. Padovan if (!disable_ertm) 11710a708f8fSGustavo F. Padovan local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; 11720a708f8fSGustavo F. Padovan 11730a708f8fSGustavo F. Padovan switch (mode) { 11740a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 11750a708f8fSGustavo F. Padovan return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; 11760a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 11770a708f8fSGustavo F. Padovan return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; 11780a708f8fSGustavo F. Padovan default: 11790a708f8fSGustavo F. Padovan return 0x00; 11800a708f8fSGustavo F. Padovan } 11810a708f8fSGustavo F. Padovan } 11820a708f8fSGustavo F. Padovan 11835e4e3972SAndrei Emeltchenko static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err) 11840a708f8fSGustavo F. Padovan { 11856be36555SAndrei Emeltchenko struct sock *sk = chan->sk; 11865e4e3972SAndrei Emeltchenko struct l2cap_conn *conn = chan->conn; 11870a708f8fSGustavo F. Padovan struct l2cap_disconn_req req; 11880a708f8fSGustavo F. Padovan 11890a708f8fSGustavo F. Padovan if (!conn) 11900a708f8fSGustavo F. Padovan return; 11910a708f8fSGustavo F. Padovan 1192aad3d0e3SAndrei Emeltchenko if (chan->mode == L2CAP_MODE_ERTM && chan->state == BT_CONNECTED) { 11931a09bcb9SGustavo F. Padovan __clear_retrans_timer(chan); 11941a09bcb9SGustavo F. Padovan __clear_monitor_timer(chan); 11951a09bcb9SGustavo F. Padovan __clear_ack_timer(chan); 11960a708f8fSGustavo F. Padovan } 11970a708f8fSGustavo F. Padovan 1198416fa752SAndrei Emeltchenko if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) { 1199d117773cSGustavo Padovan l2cap_state_change(chan, BT_DISCONN); 1200416fa752SAndrei Emeltchenko return; 1201416fa752SAndrei Emeltchenko } 1202416fa752SAndrei Emeltchenko 1203fe4128e0SGustavo F. Padovan req.dcid = cpu_to_le16(chan->dcid); 1204fe4128e0SGustavo F. Padovan req.scid = cpu_to_le16(chan->scid); 12052d792818SGustavo Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_DISCONN_REQ, 12062d792818SGustavo Padovan sizeof(req), &req); 12070a708f8fSGustavo F. Padovan 12086be36555SAndrei Emeltchenko lock_sock(sk); 12090e587be7SAndrei Emeltchenko __l2cap_state_change(chan, BT_DISCONN); 12102e0052e4SAndrei Emeltchenko __l2cap_chan_set_err(chan, err); 12116be36555SAndrei Emeltchenko release_sock(sk); 12120a708f8fSGustavo F. Padovan } 12130a708f8fSGustavo F. Padovan 12140a708f8fSGustavo F. Padovan /* ---- L2CAP connections ---- */ 12150a708f8fSGustavo F. Padovan static void l2cap_conn_start(struct l2cap_conn *conn) 12160a708f8fSGustavo F. Padovan { 12173df91ea2SAndrei Emeltchenko struct l2cap_chan *chan, *tmp; 12180a708f8fSGustavo F. Padovan 12190a708f8fSGustavo F. Padovan BT_DBG("conn %p", conn); 12200a708f8fSGustavo F. Padovan 12213df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 12220a708f8fSGustavo F. Padovan 12233df91ea2SAndrei Emeltchenko list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { 122448454079SGustavo F. Padovan struct sock *sk = chan->sk; 1225baa7e1faSGustavo F. Padovan 12266be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 12270a708f8fSGustavo F. Padovan 1228715ec005SGustavo F. Padovan if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { 12296be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 12300a708f8fSGustavo F. Padovan continue; 12310a708f8fSGustavo F. Padovan } 12320a708f8fSGustavo F. Padovan 123389bc500eSGustavo F. Padovan if (chan->state == BT_CONNECT) { 1234d45fc423SGustavo F. Padovan if (!l2cap_chan_check_security(chan) || 1235b4450035SGustavo F. Padovan !__l2cap_no_conn_pending(chan)) { 12366be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 12370a708f8fSGustavo F. Padovan continue; 12380a708f8fSGustavo F. Padovan } 12390a708f8fSGustavo F. Padovan 1240c1360a1cSGustavo F. Padovan if (!l2cap_mode_supported(chan->mode, conn->feat_mask) 1241c1360a1cSGustavo F. Padovan && test_bit(CONF_STATE2_DEVICE, 1242c1360a1cSGustavo F. Padovan &chan->conf_state)) { 12430f852724SGustavo F. Padovan l2cap_chan_close(chan, ECONNRESET); 12446be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 12450a708f8fSGustavo F. Padovan continue; 12460a708f8fSGustavo F. Padovan } 12470a708f8fSGustavo F. Padovan 124893c3e8f5SAndrei Emeltchenko l2cap_start_connection(chan); 12490a708f8fSGustavo F. Padovan 125089bc500eSGustavo F. Padovan } else if (chan->state == BT_CONNECT2) { 12510a708f8fSGustavo F. Padovan struct l2cap_conn_rsp rsp; 12520a708f8fSGustavo F. Padovan char buf[128]; 1253fe4128e0SGustavo F. Padovan rsp.scid = cpu_to_le16(chan->dcid); 1254fe4128e0SGustavo F. Padovan rsp.dcid = cpu_to_le16(chan->scid); 12550a708f8fSGustavo F. Padovan 1256d45fc423SGustavo F. Padovan if (l2cap_chan_check_security(chan)) { 12576be36555SAndrei Emeltchenko lock_sock(sk); 1258c5daa683SGustavo Padovan if (test_bit(BT_SK_DEFER_SETUP, 1259c5daa683SGustavo Padovan &bt_sk(sk)->flags)) { 1260ac73498cSAndrei Emeltchenko rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND); 1261ac73498cSAndrei Emeltchenko rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHOR_PEND); 12622dc4e510SGustavo Padovan chan->ops->defer(chan); 12630a708f8fSGustavo F. Padovan 12640a708f8fSGustavo F. Padovan } else { 12650e587be7SAndrei Emeltchenko __l2cap_state_change(chan, BT_CONFIG); 1266ac73498cSAndrei Emeltchenko rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS); 1267ac73498cSAndrei Emeltchenko rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); 12680a708f8fSGustavo F. Padovan } 12696be36555SAndrei Emeltchenko release_sock(sk); 12700a708f8fSGustavo F. Padovan } else { 1271ac73498cSAndrei Emeltchenko rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND); 1272ac73498cSAndrei Emeltchenko rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHEN_PEND); 12730a708f8fSGustavo F. Padovan } 12740a708f8fSGustavo F. Padovan 1275fc7f8a7eSGustavo F. Padovan l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, 1276fc7f8a7eSGustavo F. Padovan sizeof(rsp), &rsp); 12770a708f8fSGustavo F. Padovan 1278c1360a1cSGustavo F. Padovan if (test_bit(CONF_REQ_SENT, &chan->conf_state) || 12790a708f8fSGustavo F. Padovan rsp.result != L2CAP_CR_SUCCESS) { 12806be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 12810a708f8fSGustavo F. Padovan continue; 12820a708f8fSGustavo F. Padovan } 12830a708f8fSGustavo F. Padovan 1284c1360a1cSGustavo F. Padovan set_bit(CONF_REQ_SENT, &chan->conf_state); 12850a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 128673ffa904SGustavo F. Padovan l2cap_build_conf_req(chan, buf), buf); 128773ffa904SGustavo F. Padovan chan->num_conf_req++; 12880a708f8fSGustavo F. Padovan } 12890a708f8fSGustavo F. Padovan 12906be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 12910a708f8fSGustavo F. Padovan } 12920a708f8fSGustavo F. Padovan 12933df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 12940a708f8fSGustavo F. Padovan } 12950a708f8fSGustavo F. Padovan 1296c2287681SIdo Yariv /* Find socket with cid and source/destination bdaddr. 1297b62f328bSVille Tervo * Returns closest match, locked. 1298b62f328bSVille Tervo */ 1299d9b88702SAndrei Emeltchenko static struct l2cap_chan *l2cap_global_chan_by_scid(int state, u16 cid, 1300c2287681SIdo Yariv bdaddr_t *src, 1301c2287681SIdo Yariv bdaddr_t *dst) 1302b62f328bSVille Tervo { 130323691d75SGustavo F. Padovan struct l2cap_chan *c, *c1 = NULL; 1304b62f328bSVille Tervo 130523691d75SGustavo F. Padovan read_lock(&chan_list_lock); 1306b62f328bSVille Tervo 130723691d75SGustavo F. Padovan list_for_each_entry(c, &chan_list, global_l) { 130823691d75SGustavo F. Padovan struct sock *sk = c->sk; 1309fe4128e0SGustavo F. Padovan 131089bc500eSGustavo F. Padovan if (state && c->state != state) 1311b62f328bSVille Tervo continue; 1312b62f328bSVille Tervo 131323691d75SGustavo F. Padovan if (c->scid == cid) { 1314c2287681SIdo Yariv int src_match, dst_match; 1315c2287681SIdo Yariv int src_any, dst_any; 1316c2287681SIdo Yariv 1317b62f328bSVille Tervo /* Exact match. */ 1318c2287681SIdo Yariv src_match = !bacmp(&bt_sk(sk)->src, src); 1319c2287681SIdo Yariv dst_match = !bacmp(&bt_sk(sk)->dst, dst); 1320c2287681SIdo Yariv if (src_match && dst_match) { 132123691d75SGustavo F. Padovan read_unlock(&chan_list_lock); 132223691d75SGustavo F. Padovan return c; 132323691d75SGustavo F. Padovan } 1324b62f328bSVille Tervo 1325b62f328bSVille Tervo /* Closest match */ 1326c2287681SIdo Yariv src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY); 1327c2287681SIdo Yariv dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY); 1328c2287681SIdo Yariv if ((src_match && dst_any) || (src_any && dst_match) || 1329c2287681SIdo Yariv (src_any && dst_any)) 133023691d75SGustavo F. Padovan c1 = c; 1331b62f328bSVille Tervo } 1332b62f328bSVille Tervo } 1333280f294fSGustavo F. Padovan 133423691d75SGustavo F. Padovan read_unlock(&chan_list_lock); 1335b62f328bSVille Tervo 133623691d75SGustavo F. Padovan return c1; 1337b62f328bSVille Tervo } 1338b62f328bSVille Tervo 1339b62f328bSVille Tervo static void l2cap_le_conn_ready(struct l2cap_conn *conn) 1340b62f328bSVille Tervo { 1341c916fbe4SGustavo F. Padovan struct sock *parent, *sk; 134223691d75SGustavo F. Padovan struct l2cap_chan *chan, *pchan; 1343b62f328bSVille Tervo 1344b62f328bSVille Tervo BT_DBG(""); 1345b62f328bSVille Tervo 1346b62f328bSVille Tervo /* Check if we have socket listening on cid */ 134723691d75SGustavo F. Padovan pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA, 1348c2287681SIdo Yariv conn->src, conn->dst); 134923691d75SGustavo F. Padovan if (!pchan) 1350b62f328bSVille Tervo return; 1351b62f328bSVille Tervo 135223691d75SGustavo F. Padovan parent = pchan->sk; 135323691d75SGustavo F. Padovan 1354aa2ac881SGustavo F. Padovan lock_sock(parent); 135562f3a2cfSGustavo F. Padovan 135680b98027SGustavo Padovan chan = pchan->ops->new_connection(pchan); 135780808e43SGustavo F. Padovan if (!chan) 1358b62f328bSVille Tervo goto clean; 1359b62f328bSVille Tervo 136080808e43SGustavo F. Padovan sk = chan->sk; 13615d41ce1dSGustavo F. Padovan 1362b62f328bSVille Tervo hci_conn_hold(conn->hcon); 1363a9ea3ed9SSzymon Janc conn->hcon->disc_timeout = HCI_DISCONN_TIMEOUT; 1364b62f328bSVille Tervo 1365b62f328bSVille Tervo bacpy(&bt_sk(sk)->src, conn->src); 1366b62f328bSVille Tervo bacpy(&bt_sk(sk)->dst, conn->dst); 1367b62f328bSVille Tervo 13683d57dc68SGustavo F. Padovan l2cap_chan_add(conn, chan); 136948454079SGustavo F. Padovan 13706754e0dfSGustavo Padovan l2cap_chan_ready(chan); 1371b62f328bSVille Tervo 1372b62f328bSVille Tervo clean: 1373aa2ac881SGustavo F. Padovan release_sock(parent); 1374b62f328bSVille Tervo } 1375b62f328bSVille Tervo 13760a708f8fSGustavo F. Padovan static void l2cap_conn_ready(struct l2cap_conn *conn) 13770a708f8fSGustavo F. Padovan { 137848454079SGustavo F. Padovan struct l2cap_chan *chan; 1379cc110922SVinicius Costa Gomes struct hci_conn *hcon = conn->hcon; 13800a708f8fSGustavo F. Padovan 13810a708f8fSGustavo F. Padovan BT_DBG("conn %p", conn); 13820a708f8fSGustavo F. Padovan 1383cc110922SVinicius Costa Gomes if (!hcon->out && hcon->type == LE_LINK) 1384b62f328bSVille Tervo l2cap_le_conn_ready(conn); 1385b62f328bSVille Tervo 1386cc110922SVinicius Costa Gomes if (hcon->out && hcon->type == LE_LINK) 1387cc110922SVinicius Costa Gomes smp_conn_security(hcon, hcon->pending_sec_level); 1388160dc6acSVinicius Costa Gomes 13893df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 13900a708f8fSGustavo F. Padovan 13913df91ea2SAndrei Emeltchenko list_for_each_entry(chan, &conn->chan_l, list) { 1392baa7e1faSGustavo F. Padovan 13936be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 13940a708f8fSGustavo F. Padovan 1395416fa752SAndrei Emeltchenko if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) { 1396416fa752SAndrei Emeltchenko l2cap_chan_unlock(chan); 1397416fa752SAndrei Emeltchenko continue; 1398416fa752SAndrei Emeltchenko } 1399416fa752SAndrei Emeltchenko 1400cc110922SVinicius Costa Gomes if (hcon->type == LE_LINK) { 1401cc110922SVinicius Costa Gomes if (smp_conn_security(hcon, chan->sec_level)) 1402cf4cd009SAndrei Emeltchenko l2cap_chan_ready(chan); 1403acd7d370SVille Tervo 140463128451SVinicius Costa Gomes } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { 14056be36555SAndrei Emeltchenko struct sock *sk = chan->sk; 1406c9b66675SGustavo F. Padovan __clear_chan_timer(chan); 14076be36555SAndrei Emeltchenko lock_sock(sk); 14080e587be7SAndrei Emeltchenko __l2cap_state_change(chan, BT_CONNECTED); 14090a708f8fSGustavo F. Padovan sk->sk_state_change(sk); 14106be36555SAndrei Emeltchenko release_sock(sk); 1411b501d6a1SAnderson Briglia 141289bc500eSGustavo F. Padovan } else if (chan->state == BT_CONNECT) 1413fc7f8a7eSGustavo F. Padovan l2cap_do_start(chan); 14140a708f8fSGustavo F. Padovan 14156be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 14160a708f8fSGustavo F. Padovan } 14170a708f8fSGustavo F. Padovan 14183df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 14190a708f8fSGustavo F. Padovan } 14200a708f8fSGustavo F. Padovan 14210a708f8fSGustavo F. Padovan /* Notify sockets that we cannot guaranty reliability anymore */ 14220a708f8fSGustavo F. Padovan static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) 14230a708f8fSGustavo F. Padovan { 142448454079SGustavo F. Padovan struct l2cap_chan *chan; 14250a708f8fSGustavo F. Padovan 14260a708f8fSGustavo F. Padovan BT_DBG("conn %p", conn); 14270a708f8fSGustavo F. Padovan 14283df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 14290a708f8fSGustavo F. Padovan 14303df91ea2SAndrei Emeltchenko list_for_each_entry(chan, &conn->chan_l, list) { 1431ecf61bdbSAndrei Emeltchenko if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags)) 14321d8b1fd5SGustavo Padovan l2cap_chan_set_err(chan, err); 14330a708f8fSGustavo F. Padovan } 14340a708f8fSGustavo F. Padovan 14353df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 14360a708f8fSGustavo F. Padovan } 14370a708f8fSGustavo F. Padovan 1438f878fcadSGustavo F. Padovan static void l2cap_info_timeout(struct work_struct *work) 14390a708f8fSGustavo F. Padovan { 1440f878fcadSGustavo F. Padovan struct l2cap_conn *conn = container_of(work, struct l2cap_conn, 1441030013d8SGustavo F. Padovan info_timer.work); 14420a708f8fSGustavo F. Padovan 14430a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 14440a708f8fSGustavo F. Padovan conn->info_ident = 0; 14450a708f8fSGustavo F. Padovan 14460a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 14470a708f8fSGustavo F. Padovan } 14480a708f8fSGustavo F. Padovan 14495d3de7dfSVinicius Costa Gomes static void l2cap_conn_del(struct hci_conn *hcon, int err) 14505d3de7dfSVinicius Costa Gomes { 14515d3de7dfSVinicius Costa Gomes struct l2cap_conn *conn = hcon->l2cap_data; 14525d3de7dfSVinicius Costa Gomes struct l2cap_chan *chan, *l; 14535d3de7dfSVinicius Costa Gomes 14545d3de7dfSVinicius Costa Gomes if (!conn) 14555d3de7dfSVinicius Costa Gomes return; 14565d3de7dfSVinicius Costa Gomes 14575d3de7dfSVinicius Costa Gomes BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); 14585d3de7dfSVinicius Costa Gomes 14595d3de7dfSVinicius Costa Gomes kfree_skb(conn->rx_skb); 14605d3de7dfSVinicius Costa Gomes 14613df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 14623df91ea2SAndrei Emeltchenko 14635d3de7dfSVinicius Costa Gomes /* Kill channels */ 14645d3de7dfSVinicius Costa Gomes list_for_each_entry_safe(chan, l, &conn->chan_l, list) { 146561d6ef3eSMat Martineau l2cap_chan_hold(chan); 14666be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 14676be36555SAndrei Emeltchenko 14685d3de7dfSVinicius Costa Gomes l2cap_chan_del(chan, err); 14696be36555SAndrei Emeltchenko 14706be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 14716be36555SAndrei Emeltchenko 147280b98027SGustavo Padovan chan->ops->close(chan); 147361d6ef3eSMat Martineau l2cap_chan_put(chan); 14745d3de7dfSVinicius Costa Gomes } 14755d3de7dfSVinicius Costa Gomes 14763df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 14773df91ea2SAndrei Emeltchenko 147873d80debSLuiz Augusto von Dentz hci_chan_del(conn->hchan); 147973d80debSLuiz Augusto von Dentz 14805d3de7dfSVinicius Costa Gomes if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) 1481127074bfSUlisses Furquim cancel_delayed_work_sync(&conn->info_timer); 14825d3de7dfSVinicius Costa Gomes 148351a8efd7SJohan Hedberg if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) { 1484127074bfSUlisses Furquim cancel_delayed_work_sync(&conn->security_timer); 14858aab4757SVinicius Costa Gomes smp_chan_destroy(conn); 1486d26a2345SVinicius Costa Gomes } 14875d3de7dfSVinicius Costa Gomes 14885d3de7dfSVinicius Costa Gomes hcon->l2cap_data = NULL; 14895d3de7dfSVinicius Costa Gomes kfree(conn); 14905d3de7dfSVinicius Costa Gomes } 14915d3de7dfSVinicius Costa Gomes 14926c9d42a1SGustavo F. Padovan static void security_timeout(struct work_struct *work) 14935d3de7dfSVinicius Costa Gomes { 14946c9d42a1SGustavo F. Padovan struct l2cap_conn *conn = container_of(work, struct l2cap_conn, 14956c9d42a1SGustavo F. Padovan security_timer.work); 14965d3de7dfSVinicius Costa Gomes 1497d06cc416SJohan Hedberg BT_DBG("conn %p", conn); 1498d06cc416SJohan Hedberg 1499d06cc416SJohan Hedberg if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags)) { 1500d06cc416SJohan Hedberg smp_chan_destroy(conn); 15015d3de7dfSVinicius Costa Gomes l2cap_conn_del(conn->hcon, ETIMEDOUT); 15025d3de7dfSVinicius Costa Gomes } 1503d06cc416SJohan Hedberg } 15045d3de7dfSVinicius Costa Gomes 15050a708f8fSGustavo F. Padovan static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) 15060a708f8fSGustavo F. Padovan { 15070a708f8fSGustavo F. Padovan struct l2cap_conn *conn = hcon->l2cap_data; 150873d80debSLuiz Augusto von Dentz struct hci_chan *hchan; 15090a708f8fSGustavo F. Padovan 15100a708f8fSGustavo F. Padovan if (conn || status) 15110a708f8fSGustavo F. Padovan return conn; 15120a708f8fSGustavo F. Padovan 151373d80debSLuiz Augusto von Dentz hchan = hci_chan_create(hcon); 151473d80debSLuiz Augusto von Dentz if (!hchan) 15150a708f8fSGustavo F. Padovan return NULL; 15160a708f8fSGustavo F. Padovan 15178bcde1f2SGustavo Padovan conn = kzalloc(sizeof(struct l2cap_conn), GFP_KERNEL); 151873d80debSLuiz Augusto von Dentz if (!conn) { 151973d80debSLuiz Augusto von Dentz hci_chan_del(hchan); 152073d80debSLuiz Augusto von Dentz return NULL; 152173d80debSLuiz Augusto von Dentz } 152273d80debSLuiz Augusto von Dentz 15230a708f8fSGustavo F. Padovan hcon->l2cap_data = conn; 15240a708f8fSGustavo F. Padovan conn->hcon = hcon; 152573d80debSLuiz Augusto von Dentz conn->hchan = hchan; 15260a708f8fSGustavo F. Padovan 152773d80debSLuiz Augusto von Dentz BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan); 15280a708f8fSGustavo F. Padovan 1529dcc042d5SAndrei Emeltchenko switch (hcon->type) { 1530dcc042d5SAndrei Emeltchenko case AMP_LINK: 1531dcc042d5SAndrei Emeltchenko conn->mtu = hcon->hdev->block_mtu; 1532dcc042d5SAndrei Emeltchenko break; 1533dcc042d5SAndrei Emeltchenko 1534dcc042d5SAndrei Emeltchenko case LE_LINK: 1535dcc042d5SAndrei Emeltchenko if (hcon->hdev->le_mtu) { 1536acd7d370SVille Tervo conn->mtu = hcon->hdev->le_mtu; 1537dcc042d5SAndrei Emeltchenko break; 1538dcc042d5SAndrei Emeltchenko } 1539dcc042d5SAndrei Emeltchenko /* fall through */ 1540dcc042d5SAndrei Emeltchenko 1541dcc042d5SAndrei Emeltchenko default: 15420a708f8fSGustavo F. Padovan conn->mtu = hcon->hdev->acl_mtu; 1543dcc042d5SAndrei Emeltchenko break; 1544dcc042d5SAndrei Emeltchenko } 1545acd7d370SVille Tervo 15460a708f8fSGustavo F. Padovan conn->src = &hcon->hdev->bdaddr; 15470a708f8fSGustavo F. Padovan conn->dst = &hcon->dst; 15480a708f8fSGustavo F. Padovan 15490a708f8fSGustavo F. Padovan conn->feat_mask = 0; 15500a708f8fSGustavo F. Padovan 15510a708f8fSGustavo F. Padovan spin_lock_init(&conn->lock); 15523df91ea2SAndrei Emeltchenko mutex_init(&conn->chan_lock); 1553baa7e1faSGustavo F. Padovan 1554baa7e1faSGustavo F. Padovan INIT_LIST_HEAD(&conn->chan_l); 15550a708f8fSGustavo F. Padovan 15565d3de7dfSVinicius Costa Gomes if (hcon->type == LE_LINK) 15576c9d42a1SGustavo F. Padovan INIT_DELAYED_WORK(&conn->security_timer, security_timeout); 15585d3de7dfSVinicius Costa Gomes else 1559030013d8SGustavo F. Padovan INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout); 15600a708f8fSGustavo F. Padovan 15619f5a0d7bSAndrei Emeltchenko conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; 15620a708f8fSGustavo F. Padovan 15630a708f8fSGustavo F. Padovan return conn; 15640a708f8fSGustavo F. Padovan } 15650a708f8fSGustavo F. Padovan 15660a708f8fSGustavo F. Padovan /* ---- Socket interface ---- */ 15670a708f8fSGustavo F. Padovan 1568c2287681SIdo Yariv /* Find socket with psm and source / destination bdaddr. 15690a708f8fSGustavo F. Padovan * Returns closest match. 15700a708f8fSGustavo F. Padovan */ 1571c2287681SIdo Yariv static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, 1572c2287681SIdo Yariv bdaddr_t *src, 1573c2287681SIdo Yariv bdaddr_t *dst) 15740a708f8fSGustavo F. Padovan { 157523691d75SGustavo F. Padovan struct l2cap_chan *c, *c1 = NULL; 15760a708f8fSGustavo F. Padovan 157723691d75SGustavo F. Padovan read_lock(&chan_list_lock); 15780a708f8fSGustavo F. Padovan 157923691d75SGustavo F. Padovan list_for_each_entry(c, &chan_list, global_l) { 158023691d75SGustavo F. Padovan struct sock *sk = c->sk; 1581fe4128e0SGustavo F. Padovan 158289bc500eSGustavo F. Padovan if (state && c->state != state) 15830a708f8fSGustavo F. Padovan continue; 15840a708f8fSGustavo F. Padovan 158523691d75SGustavo F. Padovan if (c->psm == psm) { 1586c2287681SIdo Yariv int src_match, dst_match; 1587c2287681SIdo Yariv int src_any, dst_any; 1588c2287681SIdo Yariv 15890a708f8fSGustavo F. Padovan /* Exact match. */ 1590c2287681SIdo Yariv src_match = !bacmp(&bt_sk(sk)->src, src); 1591c2287681SIdo Yariv dst_match = !bacmp(&bt_sk(sk)->dst, dst); 1592c2287681SIdo Yariv if (src_match && dst_match) { 1593a7567b20SJohannes Berg read_unlock(&chan_list_lock); 159423691d75SGustavo F. Padovan return c; 159523691d75SGustavo F. Padovan } 15960a708f8fSGustavo F. Padovan 15970a708f8fSGustavo F. Padovan /* Closest match */ 1598c2287681SIdo Yariv src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY); 1599c2287681SIdo Yariv dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY); 1600c2287681SIdo Yariv if ((src_match && dst_any) || (src_any && dst_match) || 1601c2287681SIdo Yariv (src_any && dst_any)) 160223691d75SGustavo F. Padovan c1 = c; 16030a708f8fSGustavo F. Padovan } 16040a708f8fSGustavo F. Padovan } 16050a708f8fSGustavo F. Padovan 160623691d75SGustavo F. Padovan read_unlock(&chan_list_lock); 16070a708f8fSGustavo F. Padovan 160823691d75SGustavo F. Padovan return c1; 16090a708f8fSGustavo F. Padovan } 16100a708f8fSGustavo F. Padovan 16118e9f9892SAndre Guedes int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid, 16128e9f9892SAndre Guedes bdaddr_t *dst, u8 dst_type) 16130a708f8fSGustavo F. Padovan { 16145d41ce1dSGustavo F. Padovan struct sock *sk = chan->sk; 16150a708f8fSGustavo F. Padovan bdaddr_t *src = &bt_sk(sk)->src; 16160a708f8fSGustavo F. Padovan struct l2cap_conn *conn; 16170a708f8fSGustavo F. Padovan struct hci_conn *hcon; 16180a708f8fSGustavo F. Padovan struct hci_dev *hdev; 16190a708f8fSGustavo F. Padovan __u8 auth_type; 16200a708f8fSGustavo F. Padovan int err; 16210a708f8fSGustavo F. Padovan 16226ed93dc6SAndrei Emeltchenko BT_DBG("%pMR -> %pMR (type %u) psm 0x%2.2x", src, dst, 1623ab19516aSSyam Sidhardhan dst_type, __le16_to_cpu(psm)); 16240a708f8fSGustavo F. Padovan 16250a708f8fSGustavo F. Padovan hdev = hci_get_route(dst, src); 16260a708f8fSGustavo F. Padovan if (!hdev) 16270a708f8fSGustavo F. Padovan return -EHOSTUNREACH; 16280a708f8fSGustavo F. Padovan 162909fd0de5SGustavo F. Padovan hci_dev_lock(hdev); 16300a708f8fSGustavo F. Padovan 16316be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 163203a00194SGustavo F. Padovan 163303a00194SGustavo F. Padovan /* PSM must be odd and lsb of upper byte must be 0 */ 163403a00194SGustavo F. Padovan if ((__le16_to_cpu(psm) & 0x0101) != 0x0001 && !cid && 163503a00194SGustavo F. Padovan chan->chan_type != L2CAP_CHAN_RAW) { 163603a00194SGustavo F. Padovan err = -EINVAL; 163703a00194SGustavo F. Padovan goto done; 163803a00194SGustavo F. Padovan } 163903a00194SGustavo F. Padovan 164003a00194SGustavo F. Padovan if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !(psm || cid)) { 164103a00194SGustavo F. Padovan err = -EINVAL; 164203a00194SGustavo F. Padovan goto done; 164303a00194SGustavo F. Padovan } 164403a00194SGustavo F. Padovan 164503a00194SGustavo F. Padovan switch (chan->mode) { 164603a00194SGustavo F. Padovan case L2CAP_MODE_BASIC: 164703a00194SGustavo F. Padovan break; 164803a00194SGustavo F. Padovan case L2CAP_MODE_ERTM: 164903a00194SGustavo F. Padovan case L2CAP_MODE_STREAMING: 165003a00194SGustavo F. Padovan if (!disable_ertm) 165103a00194SGustavo F. Padovan break; 165203a00194SGustavo F. Padovan /* fall through */ 165303a00194SGustavo F. Padovan default: 165403a00194SGustavo F. Padovan err = -ENOTSUPP; 165503a00194SGustavo F. Padovan goto done; 165603a00194SGustavo F. Padovan } 165703a00194SGustavo F. Padovan 16580797e01dSGustavo Padovan switch (chan->state) { 165903a00194SGustavo F. Padovan case BT_CONNECT: 166003a00194SGustavo F. Padovan case BT_CONNECT2: 166103a00194SGustavo F. Padovan case BT_CONFIG: 166203a00194SGustavo F. Padovan /* Already connecting */ 166303a00194SGustavo F. Padovan err = 0; 166403a00194SGustavo F. Padovan goto done; 166503a00194SGustavo F. Padovan 166603a00194SGustavo F. Padovan case BT_CONNECTED: 166703a00194SGustavo F. Padovan /* Already connected */ 166803a00194SGustavo F. Padovan err = -EISCONN; 166903a00194SGustavo F. Padovan goto done; 167003a00194SGustavo F. Padovan 167103a00194SGustavo F. Padovan case BT_OPEN: 167203a00194SGustavo F. Padovan case BT_BOUND: 167303a00194SGustavo F. Padovan /* Can connect */ 167403a00194SGustavo F. Padovan break; 167503a00194SGustavo F. Padovan 167603a00194SGustavo F. Padovan default: 167703a00194SGustavo F. Padovan err = -EBADFD; 167803a00194SGustavo F. Padovan goto done; 167903a00194SGustavo F. Padovan } 168003a00194SGustavo F. Padovan 168103a00194SGustavo F. Padovan /* Set destination address and psm */ 16820797e01dSGustavo Padovan lock_sock(sk); 16839219b2a0SGustavo F. Padovan bacpy(&bt_sk(sk)->dst, dst); 16846be36555SAndrei Emeltchenko release_sock(sk); 16856be36555SAndrei Emeltchenko 168603a00194SGustavo F. Padovan chan->psm = psm; 168703a00194SGustavo F. Padovan chan->dcid = cid; 16880a708f8fSGustavo F. Padovan 16894343478fSGustavo F. Padovan auth_type = l2cap_get_auth_type(chan); 16900a708f8fSGustavo F. Padovan 1691fe4128e0SGustavo F. Padovan if (chan->dcid == L2CAP_CID_LE_DATA) 16928e9f9892SAndre Guedes hcon = hci_connect(hdev, LE_LINK, dst, dst_type, 16934343478fSGustavo F. Padovan chan->sec_level, auth_type); 1694acd7d370SVille Tervo else 16958e9f9892SAndre Guedes hcon = hci_connect(hdev, ACL_LINK, dst, dst_type, 16964343478fSGustavo F. Padovan chan->sec_level, auth_type); 1697acd7d370SVille Tervo 169830e76272SVille Tervo if (IS_ERR(hcon)) { 169930e76272SVille Tervo err = PTR_ERR(hcon); 17000a708f8fSGustavo F. Padovan goto done; 170130e76272SVille Tervo } 17020a708f8fSGustavo F. Padovan 17030a708f8fSGustavo F. Padovan conn = l2cap_conn_add(hcon, 0); 17040a708f8fSGustavo F. Padovan if (!conn) { 17050a708f8fSGustavo F. Padovan hci_conn_put(hcon); 170630e76272SVille Tervo err = -ENOMEM; 17070a708f8fSGustavo F. Padovan goto done; 17080a708f8fSGustavo F. Padovan } 17090a708f8fSGustavo F. Padovan 17109f0caeb1SVinicius Costa Gomes if (hcon->type == LE_LINK) { 17119f0caeb1SVinicius Costa Gomes err = 0; 17129f0caeb1SVinicius Costa Gomes 17139f0caeb1SVinicius Costa Gomes if (!list_empty(&conn->chan_l)) { 17149f0caeb1SVinicius Costa Gomes err = -EBUSY; 17159f0caeb1SVinicius Costa Gomes hci_conn_put(hcon); 17169f0caeb1SVinicius Costa Gomes } 17179f0caeb1SVinicius Costa Gomes 17189f0caeb1SVinicius Costa Gomes if (err) 17199f0caeb1SVinicius Costa Gomes goto done; 17209f0caeb1SVinicius Costa Gomes } 17219f0caeb1SVinicius Costa Gomes 17220a708f8fSGustavo F. Padovan /* Update source addr of the socket */ 17230a708f8fSGustavo F. Padovan bacpy(src, conn->src); 17240a708f8fSGustavo F. Padovan 17256be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 172648454079SGustavo F. Padovan l2cap_chan_add(conn, chan); 17276be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 172848454079SGustavo F. Padovan 17296be36555SAndrei Emeltchenko l2cap_state_change(chan, BT_CONNECT); 1730c9b66675SGustavo F. Padovan __set_chan_timer(chan, sk->sk_sndtimeo); 17310a708f8fSGustavo F. Padovan 17320a708f8fSGustavo F. Padovan if (hcon->state == BT_CONNECTED) { 1733715ec005SGustavo F. Padovan if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { 1734c9b66675SGustavo F. Padovan __clear_chan_timer(chan); 1735d45fc423SGustavo F. Padovan if (l2cap_chan_check_security(chan)) 17366be36555SAndrei Emeltchenko l2cap_state_change(chan, BT_CONNECTED); 17370a708f8fSGustavo F. Padovan } else 1738fc7f8a7eSGustavo F. Padovan l2cap_do_start(chan); 17390a708f8fSGustavo F. Padovan } 17400a708f8fSGustavo F. Padovan 174130e76272SVille Tervo err = 0; 174230e76272SVille Tervo 17430a708f8fSGustavo F. Padovan done: 17446be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 174509fd0de5SGustavo F. Padovan hci_dev_unlock(hdev); 17460a708f8fSGustavo F. Padovan hci_dev_put(hdev); 17470a708f8fSGustavo F. Padovan return err; 17480a708f8fSGustavo F. Padovan } 17490a708f8fSGustavo F. Padovan 1750dcba0dbaSGustavo F. Padovan int __l2cap_wait_ack(struct sock *sk) 17510a708f8fSGustavo F. Padovan { 17528c1d787bSGustavo F. Padovan struct l2cap_chan *chan = l2cap_pi(sk)->chan; 17530a708f8fSGustavo F. Padovan DECLARE_WAITQUEUE(wait, current); 17540a708f8fSGustavo F. Padovan int err = 0; 17550a708f8fSGustavo F. Padovan int timeo = HZ/5; 17560a708f8fSGustavo F. Padovan 17570a708f8fSGustavo F. Padovan add_wait_queue(sk_sleep(sk), &wait); 17580a708f8fSGustavo F. Padovan set_current_state(TASK_INTERRUPTIBLE); 1759a71a0cf4SPeter Hurley while (chan->unacked_frames > 0 && chan->conn) { 17600a708f8fSGustavo F. Padovan if (!timeo) 17610a708f8fSGustavo F. Padovan timeo = HZ/5; 17620a708f8fSGustavo F. Padovan 17630a708f8fSGustavo F. Padovan if (signal_pending(current)) { 17640a708f8fSGustavo F. Padovan err = sock_intr_errno(timeo); 17650a708f8fSGustavo F. Padovan break; 17660a708f8fSGustavo F. Padovan } 17670a708f8fSGustavo F. Padovan 17680a708f8fSGustavo F. Padovan release_sock(sk); 17690a708f8fSGustavo F. Padovan timeo = schedule_timeout(timeo); 17700a708f8fSGustavo F. Padovan lock_sock(sk); 1771a71a0cf4SPeter Hurley set_current_state(TASK_INTERRUPTIBLE); 17720a708f8fSGustavo F. Padovan 17730a708f8fSGustavo F. Padovan err = sock_error(sk); 17740a708f8fSGustavo F. Padovan if (err) 17750a708f8fSGustavo F. Padovan break; 17760a708f8fSGustavo F. Padovan } 17770a708f8fSGustavo F. Padovan set_current_state(TASK_RUNNING); 17780a708f8fSGustavo F. Padovan remove_wait_queue(sk_sleep(sk), &wait); 17790a708f8fSGustavo F. Padovan return err; 17800a708f8fSGustavo F. Padovan } 17810a708f8fSGustavo F. Padovan 1782721c4181SGustavo F. Padovan static void l2cap_monitor_timeout(struct work_struct *work) 17830a708f8fSGustavo F. Padovan { 1784721c4181SGustavo F. Padovan struct l2cap_chan *chan = container_of(work, struct l2cap_chan, 1785721c4181SGustavo F. Padovan monitor_timer.work); 17860a708f8fSGustavo F. Padovan 1787525cd185SGustavo F. Padovan BT_DBG("chan %p", chan); 17880a708f8fSGustavo F. Padovan 17896be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 17906be36555SAndrei Emeltchenko 179180909e04SMat Martineau if (!chan->conn) { 17926be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 17938d7e1c7fSAndrei Emeltchenko l2cap_chan_put(chan); 17940a708f8fSGustavo F. Padovan return; 17950a708f8fSGustavo F. Padovan } 17960a708f8fSGustavo F. Padovan 1797401bb1f7SAndrei Emeltchenko l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO); 17980a708f8fSGustavo F. Padovan 17996be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 18008d7e1c7fSAndrei Emeltchenko l2cap_chan_put(chan); 18010a708f8fSGustavo F. Padovan } 18020a708f8fSGustavo F. Padovan 1803721c4181SGustavo F. Padovan static void l2cap_retrans_timeout(struct work_struct *work) 18040a708f8fSGustavo F. Padovan { 1805721c4181SGustavo F. Padovan struct l2cap_chan *chan = container_of(work, struct l2cap_chan, 1806721c4181SGustavo F. Padovan retrans_timer.work); 18070a708f8fSGustavo F. Padovan 180849208c9cSGustavo F. Padovan BT_DBG("chan %p", chan); 18090a708f8fSGustavo F. Padovan 18106be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 18116be36555SAndrei Emeltchenko 181280909e04SMat Martineau if (!chan->conn) { 181380909e04SMat Martineau l2cap_chan_unlock(chan); 181480909e04SMat Martineau l2cap_chan_put(chan); 181580909e04SMat Martineau return; 181680909e04SMat Martineau } 18170a708f8fSGustavo F. Padovan 1818401bb1f7SAndrei Emeltchenko l2cap_tx(chan, NULL, NULL, L2CAP_EV_RETRANS_TO); 18196be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 18208d7e1c7fSAndrei Emeltchenko l2cap_chan_put(chan); 18210a708f8fSGustavo F. Padovan } 18220a708f8fSGustavo F. Padovan 1823d660366dSGustavo Padovan static void l2cap_streaming_send(struct l2cap_chan *chan, 18243733937dSMat Martineau struct sk_buff_head *skbs) 18250a708f8fSGustavo F. Padovan { 18260a708f8fSGustavo F. Padovan struct sk_buff *skb; 18273733937dSMat Martineau struct l2cap_ctrl *control; 18280a708f8fSGustavo F. Padovan 18293733937dSMat Martineau BT_DBG("chan %p, skbs %p", chan, skbs); 18303733937dSMat Martineau 1831b99e13adSMat Martineau if (__chan_is_moving(chan)) 1832b99e13adSMat Martineau return; 1833b99e13adSMat Martineau 18343733937dSMat Martineau skb_queue_splice_tail_init(skbs, &chan->tx_q); 18353733937dSMat Martineau 18363733937dSMat Martineau while (!skb_queue_empty(&chan->tx_q)) { 18373733937dSMat Martineau 18383733937dSMat Martineau skb = skb_dequeue(&chan->tx_q); 18393733937dSMat Martineau 18403733937dSMat Martineau bt_cb(skb)->control.retries = 1; 18413733937dSMat Martineau control = &bt_cb(skb)->control; 18423733937dSMat Martineau 18433733937dSMat Martineau control->reqseq = 0; 18443733937dSMat Martineau control->txseq = chan->next_tx_seq; 18453733937dSMat Martineau 18463733937dSMat Martineau __pack_control(chan, control, skb); 18470a708f8fSGustavo F. Padovan 184847d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) { 18493733937dSMat Martineau u16 fcs = crc16(0, (u8 *) skb->data, skb->len); 18503733937dSMat Martineau put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); 18510a708f8fSGustavo F. Padovan } 18520a708f8fSGustavo F. Padovan 18534343478fSGustavo F. Padovan l2cap_do_send(chan, skb); 18540a708f8fSGustavo F. Padovan 1855b4400672SAndrei Emeltchenko BT_DBG("Sent txseq %u", control->txseq); 18563733937dSMat Martineau 1857836be934SAndrei Emeltchenko chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); 18583733937dSMat Martineau chan->frames_sent++; 18590a708f8fSGustavo F. Padovan } 18600a708f8fSGustavo F. Padovan } 18610a708f8fSGustavo F. Padovan 186267c9e840SSzymon Janc static int l2cap_ertm_send(struct l2cap_chan *chan) 18630a708f8fSGustavo F. Padovan { 18640a708f8fSGustavo F. Padovan struct sk_buff *skb, *tx_skb; 186518a48e76SMat Martineau struct l2cap_ctrl *control; 186618a48e76SMat Martineau int sent = 0; 186718a48e76SMat Martineau 186818a48e76SMat Martineau BT_DBG("chan %p", chan); 18690a708f8fSGustavo F. Padovan 187089bc500eSGustavo F. Padovan if (chan->state != BT_CONNECTED) 18710a708f8fSGustavo F. Padovan return -ENOTCONN; 18720a708f8fSGustavo F. Padovan 187394122bbeSMat Martineau if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) 187494122bbeSMat Martineau return 0; 187594122bbeSMat Martineau 1876b99e13adSMat Martineau if (__chan_is_moving(chan)) 1877b99e13adSMat Martineau return 0; 1878b99e13adSMat Martineau 187918a48e76SMat Martineau while (chan->tx_send_head && 188018a48e76SMat Martineau chan->unacked_frames < chan->remote_tx_win && 188118a48e76SMat Martineau chan->tx_state == L2CAP_TX_STATE_XMIT) { 18820a708f8fSGustavo F. Padovan 188318a48e76SMat Martineau skb = chan->tx_send_head; 18840a708f8fSGustavo F. Padovan 188518a48e76SMat Martineau bt_cb(skb)->control.retries = 1; 188618a48e76SMat Martineau control = &bt_cb(skb)->control; 18870a708f8fSGustavo F. Padovan 1888e2ab4353SGustavo F. Padovan if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) 188918a48e76SMat Martineau control->final = 1; 1890e2ab4353SGustavo F. Padovan 189118a48e76SMat Martineau control->reqseq = chan->buffer_seq; 189218a48e76SMat Martineau chan->last_acked_seq = chan->buffer_seq; 189318a48e76SMat Martineau control->txseq = chan->next_tx_seq; 18940a708f8fSGustavo F. Padovan 189518a48e76SMat Martineau __pack_control(chan, control, skb); 18960a708f8fSGustavo F. Padovan 189747d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) { 189818a48e76SMat Martineau u16 fcs = crc16(0, (u8 *) skb->data, skb->len); 189918a48e76SMat Martineau put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); 19000a708f8fSGustavo F. Padovan } 19010a708f8fSGustavo F. Padovan 190218a48e76SMat Martineau /* Clone after data has been modified. Data is assumed to be 190318a48e76SMat Martineau read-only (for locking purposes) on cloned sk_buffs. 190418a48e76SMat Martineau */ 190518a48e76SMat Martineau tx_skb = skb_clone(skb, GFP_KERNEL); 190618a48e76SMat Martineau 190718a48e76SMat Martineau if (!tx_skb) 190818a48e76SMat Martineau break; 19090a708f8fSGustavo F. Padovan 19101a09bcb9SGustavo F. Padovan __set_retrans_timer(chan); 19110a708f8fSGustavo F. Padovan 1912836be934SAndrei Emeltchenko chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); 19136a026610SGustavo F. Padovan chan->unacked_frames++; 19146a026610SGustavo F. Padovan chan->frames_sent++; 191518a48e76SMat Martineau sent++; 19160a708f8fSGustavo F. Padovan 191758d35f87SGustavo F. Padovan if (skb_queue_is_last(&chan->tx_q, skb)) 191858d35f87SGustavo F. Padovan chan->tx_send_head = NULL; 19190a708f8fSGustavo F. Padovan else 192058d35f87SGustavo F. Padovan chan->tx_send_head = skb_queue_next(&chan->tx_q, skb); 192118a48e76SMat Martineau 192218a48e76SMat Martineau l2cap_do_send(chan, tx_skb); 1923b4400672SAndrei Emeltchenko BT_DBG("Sent txseq %u", control->txseq); 19240a708f8fSGustavo F. Padovan } 19250a708f8fSGustavo F. Padovan 1926b4400672SAndrei Emeltchenko BT_DBG("Sent %d, %u unacked, %u in ERTM queue", sent, 1927b4400672SAndrei Emeltchenko chan->unacked_frames, skb_queue_len(&chan->tx_q)); 192818a48e76SMat Martineau 192918a48e76SMat Martineau return sent; 19300a708f8fSGustavo F. Padovan } 19310a708f8fSGustavo F. Padovan 1932e1fbd4c1SMat Martineau static void l2cap_ertm_resend(struct l2cap_chan *chan) 1933e1fbd4c1SMat Martineau { 1934e1fbd4c1SMat Martineau struct l2cap_ctrl control; 1935e1fbd4c1SMat Martineau struct sk_buff *skb; 1936e1fbd4c1SMat Martineau struct sk_buff *tx_skb; 1937e1fbd4c1SMat Martineau u16 seq; 1938e1fbd4c1SMat Martineau 1939e1fbd4c1SMat Martineau BT_DBG("chan %p", chan); 1940e1fbd4c1SMat Martineau 1941e1fbd4c1SMat Martineau if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) 1942e1fbd4c1SMat Martineau return; 1943e1fbd4c1SMat Martineau 1944b99e13adSMat Martineau if (__chan_is_moving(chan)) 1945b99e13adSMat Martineau return; 1946b99e13adSMat Martineau 1947e1fbd4c1SMat Martineau while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) { 1948e1fbd4c1SMat Martineau seq = l2cap_seq_list_pop(&chan->retrans_list); 1949e1fbd4c1SMat Martineau 1950e1fbd4c1SMat Martineau skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq); 1951e1fbd4c1SMat Martineau if (!skb) { 1952e1fbd4c1SMat Martineau BT_DBG("Error: Can't retransmit seq %d, frame missing", 1953e1fbd4c1SMat Martineau seq); 1954e1fbd4c1SMat Martineau continue; 1955e1fbd4c1SMat Martineau } 1956e1fbd4c1SMat Martineau 1957e1fbd4c1SMat Martineau bt_cb(skb)->control.retries++; 1958e1fbd4c1SMat Martineau control = bt_cb(skb)->control; 1959e1fbd4c1SMat Martineau 1960e1fbd4c1SMat Martineau if (chan->max_tx != 0 && 1961e1fbd4c1SMat Martineau bt_cb(skb)->control.retries > chan->max_tx) { 1962e1fbd4c1SMat Martineau BT_DBG("Retry limit exceeded (%d)", chan->max_tx); 19635e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 1964e1fbd4c1SMat Martineau l2cap_seq_list_clear(&chan->retrans_list); 1965e1fbd4c1SMat Martineau break; 1966e1fbd4c1SMat Martineau } 1967e1fbd4c1SMat Martineau 1968e1fbd4c1SMat Martineau control.reqseq = chan->buffer_seq; 1969e1fbd4c1SMat Martineau if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) 1970e1fbd4c1SMat Martineau control.final = 1; 1971e1fbd4c1SMat Martineau else 1972e1fbd4c1SMat Martineau control.final = 0; 1973e1fbd4c1SMat Martineau 1974e1fbd4c1SMat Martineau if (skb_cloned(skb)) { 1975e1fbd4c1SMat Martineau /* Cloned sk_buffs are read-only, so we need a 1976e1fbd4c1SMat Martineau * writeable copy 1977e1fbd4c1SMat Martineau */ 19788bcde1f2SGustavo Padovan tx_skb = skb_copy(skb, GFP_KERNEL); 1979e1fbd4c1SMat Martineau } else { 19808bcde1f2SGustavo Padovan tx_skb = skb_clone(skb, GFP_KERNEL); 1981e1fbd4c1SMat Martineau } 1982e1fbd4c1SMat Martineau 1983e1fbd4c1SMat Martineau if (!tx_skb) { 1984e1fbd4c1SMat Martineau l2cap_seq_list_clear(&chan->retrans_list); 1985e1fbd4c1SMat Martineau break; 1986e1fbd4c1SMat Martineau } 1987e1fbd4c1SMat Martineau 1988e1fbd4c1SMat Martineau /* Update skb contents */ 1989e1fbd4c1SMat Martineau if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { 1990e1fbd4c1SMat Martineau put_unaligned_le32(__pack_extended_control(&control), 1991e1fbd4c1SMat Martineau tx_skb->data + L2CAP_HDR_SIZE); 1992e1fbd4c1SMat Martineau } else { 1993e1fbd4c1SMat Martineau put_unaligned_le16(__pack_enhanced_control(&control), 1994e1fbd4c1SMat Martineau tx_skb->data + L2CAP_HDR_SIZE); 1995e1fbd4c1SMat Martineau } 1996e1fbd4c1SMat Martineau 1997e1fbd4c1SMat Martineau if (chan->fcs == L2CAP_FCS_CRC16) { 1998e1fbd4c1SMat Martineau u16 fcs = crc16(0, (u8 *) tx_skb->data, tx_skb->len); 1999e1fbd4c1SMat Martineau put_unaligned_le16(fcs, skb_put(tx_skb, 2000e1fbd4c1SMat Martineau L2CAP_FCS_SIZE)); 2001e1fbd4c1SMat Martineau } 2002e1fbd4c1SMat Martineau 2003e1fbd4c1SMat Martineau l2cap_do_send(chan, tx_skb); 2004e1fbd4c1SMat Martineau 2005e1fbd4c1SMat Martineau BT_DBG("Resent txseq %d", control.txseq); 2006e1fbd4c1SMat Martineau 2007e1fbd4c1SMat Martineau chan->last_acked_seq = chan->buffer_seq; 2008e1fbd4c1SMat Martineau } 2009e1fbd4c1SMat Martineau } 2010e1fbd4c1SMat Martineau 2011f80842a8SMat Martineau static void l2cap_retransmit(struct l2cap_chan *chan, 2012f80842a8SMat Martineau struct l2cap_ctrl *control) 2013f80842a8SMat Martineau { 2014f80842a8SMat Martineau BT_DBG("chan %p, control %p", chan, control); 2015f80842a8SMat Martineau 2016f80842a8SMat Martineau l2cap_seq_list_append(&chan->retrans_list, control->reqseq); 2017f80842a8SMat Martineau l2cap_ertm_resend(chan); 2018f80842a8SMat Martineau } 2019f80842a8SMat Martineau 2020d2a7ac5dSMat Martineau static void l2cap_retransmit_all(struct l2cap_chan *chan, 2021d2a7ac5dSMat Martineau struct l2cap_ctrl *control) 2022d2a7ac5dSMat Martineau { 2023e1fbd4c1SMat Martineau struct sk_buff *skb; 2024e1fbd4c1SMat Martineau 2025e1fbd4c1SMat Martineau BT_DBG("chan %p, control %p", chan, control); 2026e1fbd4c1SMat Martineau 2027e1fbd4c1SMat Martineau if (control->poll) 2028e1fbd4c1SMat Martineau set_bit(CONN_SEND_FBIT, &chan->conn_state); 2029e1fbd4c1SMat Martineau 2030e1fbd4c1SMat Martineau l2cap_seq_list_clear(&chan->retrans_list); 2031e1fbd4c1SMat Martineau 2032e1fbd4c1SMat Martineau if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) 2033e1fbd4c1SMat Martineau return; 2034e1fbd4c1SMat Martineau 2035e1fbd4c1SMat Martineau if (chan->unacked_frames) { 2036e1fbd4c1SMat Martineau skb_queue_walk(&chan->tx_q, skb) { 2037e1fbd4c1SMat Martineau if (bt_cb(skb)->control.txseq == control->reqseq || 2038e1fbd4c1SMat Martineau skb == chan->tx_send_head) 2039e1fbd4c1SMat Martineau break; 2040e1fbd4c1SMat Martineau } 2041e1fbd4c1SMat Martineau 2042e1fbd4c1SMat Martineau skb_queue_walk_from(&chan->tx_q, skb) { 2043e1fbd4c1SMat Martineau if (skb == chan->tx_send_head) 2044e1fbd4c1SMat Martineau break; 2045e1fbd4c1SMat Martineau 2046e1fbd4c1SMat Martineau l2cap_seq_list_append(&chan->retrans_list, 2047e1fbd4c1SMat Martineau bt_cb(skb)->control.txseq); 2048e1fbd4c1SMat Martineau } 2049e1fbd4c1SMat Martineau 2050e1fbd4c1SMat Martineau l2cap_ertm_resend(chan); 2051e1fbd4c1SMat Martineau } 2052d2a7ac5dSMat Martineau } 2053d2a7ac5dSMat Martineau 2054b17e73bbSSzymon Janc static void l2cap_send_ack(struct l2cap_chan *chan) 2055b17e73bbSSzymon Janc { 20560a0aba42SMat Martineau struct l2cap_ctrl control; 20570a0aba42SMat Martineau u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq, 20580a0aba42SMat Martineau chan->last_acked_seq); 20590a0aba42SMat Martineau int threshold; 20600a0aba42SMat Martineau 20610a0aba42SMat Martineau BT_DBG("chan %p last_acked_seq %d buffer_seq %d", 20620a0aba42SMat Martineau chan, chan->last_acked_seq, chan->buffer_seq); 20630a0aba42SMat Martineau 20640a0aba42SMat Martineau memset(&control, 0, sizeof(control)); 20650a0aba42SMat Martineau control.sframe = 1; 20660a0aba42SMat Martineau 20670a0aba42SMat Martineau if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && 20680a0aba42SMat Martineau chan->rx_state == L2CAP_RX_STATE_RECV) { 2069b17e73bbSSzymon Janc __clear_ack_timer(chan); 20700a0aba42SMat Martineau control.super = L2CAP_SUPER_RNR; 20710a0aba42SMat Martineau control.reqseq = chan->buffer_seq; 20720a0aba42SMat Martineau l2cap_send_sframe(chan, &control); 20730a0aba42SMat Martineau } else { 20740a0aba42SMat Martineau if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) { 20750a0aba42SMat Martineau l2cap_ertm_send(chan); 20760a0aba42SMat Martineau /* If any i-frames were sent, they included an ack */ 20770a0aba42SMat Martineau if (chan->buffer_seq == chan->last_acked_seq) 20780a0aba42SMat Martineau frames_to_ack = 0; 20790a0aba42SMat Martineau } 20800a0aba42SMat Martineau 2081c20f8e35SMat Martineau /* Ack now if the window is 3/4ths full. 20820a0aba42SMat Martineau * Calculate without mul or div 20830a0aba42SMat Martineau */ 2084c20f8e35SMat Martineau threshold = chan->ack_win; 20850a0aba42SMat Martineau threshold += threshold << 1; 20860a0aba42SMat Martineau threshold >>= 2; 20870a0aba42SMat Martineau 2088b4400672SAndrei Emeltchenko BT_DBG("frames_to_ack %u, threshold %d", frames_to_ack, 20890a0aba42SMat Martineau threshold); 20900a0aba42SMat Martineau 20910a0aba42SMat Martineau if (frames_to_ack >= threshold) { 20920a0aba42SMat Martineau __clear_ack_timer(chan); 20930a0aba42SMat Martineau control.super = L2CAP_SUPER_RR; 20940a0aba42SMat Martineau control.reqseq = chan->buffer_seq; 20950a0aba42SMat Martineau l2cap_send_sframe(chan, &control); 20960a0aba42SMat Martineau frames_to_ack = 0; 20970a0aba42SMat Martineau } 20980a0aba42SMat Martineau 20990a0aba42SMat Martineau if (frames_to_ack) 21000a0aba42SMat Martineau __set_ack_timer(chan); 21010a0aba42SMat Martineau } 2102b17e73bbSSzymon Janc } 2103b17e73bbSSzymon Janc 210404124681SGustavo F. Padovan static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan, 210504124681SGustavo F. Padovan struct msghdr *msg, int len, 210604124681SGustavo F. Padovan int count, struct sk_buff *skb) 21070a708f8fSGustavo F. Padovan { 21080952a57aSAndrei Emeltchenko struct l2cap_conn *conn = chan->conn; 21090a708f8fSGustavo F. Padovan struct sk_buff **frag; 211090338947SGustavo Padovan int sent = 0; 21110a708f8fSGustavo F. Padovan 21120a708f8fSGustavo F. Padovan if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) 21130a708f8fSGustavo F. Padovan return -EFAULT; 21140a708f8fSGustavo F. Padovan 21150a708f8fSGustavo F. Padovan sent += count; 21160a708f8fSGustavo F. Padovan len -= count; 21170a708f8fSGustavo F. Padovan 21180a708f8fSGustavo F. Padovan /* Continuation fragments (no L2CAP header) */ 21190a708f8fSGustavo F. Padovan frag = &skb_shinfo(skb)->frag_list; 21200a708f8fSGustavo F. Padovan while (len) { 2121fbe00700SGustavo Padovan struct sk_buff *tmp; 2122fbe00700SGustavo Padovan 21230a708f8fSGustavo F. Padovan count = min_t(unsigned int, conn->mtu, len); 21240a708f8fSGustavo F. Padovan 2125fbe00700SGustavo Padovan tmp = chan->ops->alloc_skb(chan, count, 212690338947SGustavo Padovan msg->msg_flags & MSG_DONTWAIT); 2127fbe00700SGustavo Padovan if (IS_ERR(tmp)) 2128fbe00700SGustavo Padovan return PTR_ERR(tmp); 21292f7719ceSAndrei Emeltchenko 2130fbe00700SGustavo Padovan *frag = tmp; 2131fbe00700SGustavo Padovan 21320a708f8fSGustavo F. Padovan if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) 21330a708f8fSGustavo F. Padovan return -EFAULT; 21340a708f8fSGustavo F. Padovan 21355e59b791SLuiz Augusto von Dentz (*frag)->priority = skb->priority; 21365e59b791SLuiz Augusto von Dentz 21370a708f8fSGustavo F. Padovan sent += count; 21380a708f8fSGustavo F. Padovan len -= count; 21390a708f8fSGustavo F. Padovan 21402d0ed3d5SGustavo Padovan skb->len += (*frag)->len; 21412d0ed3d5SGustavo Padovan skb->data_len += (*frag)->len; 21422d0ed3d5SGustavo Padovan 21430a708f8fSGustavo F. Padovan frag = &(*frag)->next; 21440a708f8fSGustavo F. Padovan } 21450a708f8fSGustavo F. Padovan 21460a708f8fSGustavo F. Padovan return sent; 21470a708f8fSGustavo F. Padovan } 21480a708f8fSGustavo F. Padovan 21495e59b791SLuiz Augusto von Dentz static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, 21505e59b791SLuiz Augusto von Dentz struct msghdr *msg, size_t len, 21515e59b791SLuiz Augusto von Dentz u32 priority) 21520a708f8fSGustavo F. Padovan { 21538c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 21540a708f8fSGustavo F. Padovan struct sk_buff *skb; 215503a51213SAndrei Emeltchenko int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE; 21560a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 21570a708f8fSGustavo F. Padovan 2158b4400672SAndrei Emeltchenko BT_DBG("chan %p len %zu priority %u", chan, len, priority); 21590a708f8fSGustavo F. Padovan 21600a708f8fSGustavo F. Padovan count = min_t(unsigned int, (conn->mtu - hlen), len); 21612f7719ceSAndrei Emeltchenko 21622f7719ceSAndrei Emeltchenko skb = chan->ops->alloc_skb(chan, count + hlen, 216390338947SGustavo Padovan msg->msg_flags & MSG_DONTWAIT); 216490338947SGustavo Padovan if (IS_ERR(skb)) 216590338947SGustavo Padovan return skb; 21660a708f8fSGustavo F. Padovan 21675e59b791SLuiz Augusto von Dentz skb->priority = priority; 21685e59b791SLuiz Augusto von Dentz 21690a708f8fSGustavo F. Padovan /* Create L2CAP header */ 21700a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 2171fe4128e0SGustavo F. Padovan lh->cid = cpu_to_le16(chan->dcid); 2172daf6a78cSAndrei Emeltchenko lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE); 2173daf6a78cSAndrei Emeltchenko put_unaligned(chan->psm, skb_put(skb, L2CAP_PSMLEN_SIZE)); 21740a708f8fSGustavo F. Padovan 21750952a57aSAndrei Emeltchenko err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); 21760a708f8fSGustavo F. Padovan if (unlikely(err < 0)) { 21770a708f8fSGustavo F. Padovan kfree_skb(skb); 21780a708f8fSGustavo F. Padovan return ERR_PTR(err); 21790a708f8fSGustavo F. Padovan } 21800a708f8fSGustavo F. Padovan return skb; 21810a708f8fSGustavo F. Padovan } 21820a708f8fSGustavo F. Padovan 21835e59b791SLuiz Augusto von Dentz static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, 21845e59b791SLuiz Augusto von Dentz struct msghdr *msg, size_t len, 21855e59b791SLuiz Augusto von Dentz u32 priority) 21860a708f8fSGustavo F. Padovan { 21878c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 21880a708f8fSGustavo F. Padovan struct sk_buff *skb; 2189f2ba7faeSGustavo Padovan int err, count; 21900a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 21910a708f8fSGustavo F. Padovan 2192b4400672SAndrei Emeltchenko BT_DBG("chan %p len %zu", chan, len); 21930a708f8fSGustavo F. Padovan 2194f2ba7faeSGustavo Padovan count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len); 21952f7719ceSAndrei Emeltchenko 2196f2ba7faeSGustavo Padovan skb = chan->ops->alloc_skb(chan, count + L2CAP_HDR_SIZE, 219790338947SGustavo Padovan msg->msg_flags & MSG_DONTWAIT); 219890338947SGustavo Padovan if (IS_ERR(skb)) 219990338947SGustavo Padovan return skb; 22000a708f8fSGustavo F. Padovan 22015e59b791SLuiz Augusto von Dentz skb->priority = priority; 22025e59b791SLuiz Augusto von Dentz 22030a708f8fSGustavo F. Padovan /* Create L2CAP header */ 22040a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 2205fe4128e0SGustavo F. Padovan lh->cid = cpu_to_le16(chan->dcid); 22066ff9b5efSGustavo Padovan lh->len = cpu_to_le16(len); 22070a708f8fSGustavo F. Padovan 22080952a57aSAndrei Emeltchenko err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); 22090a708f8fSGustavo F. Padovan if (unlikely(err < 0)) { 22100a708f8fSGustavo F. Padovan kfree_skb(skb); 22110a708f8fSGustavo F. Padovan return ERR_PTR(err); 22120a708f8fSGustavo F. Padovan } 22130a708f8fSGustavo F. Padovan return skb; 22140a708f8fSGustavo F. Padovan } 22150a708f8fSGustavo F. Padovan 2216ab0ff76dSLuiz Augusto von Dentz static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, 2217ab0ff76dSLuiz Augusto von Dentz struct msghdr *msg, size_t len, 221894122bbeSMat Martineau u16 sdulen) 22190a708f8fSGustavo F. Padovan { 22208c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 22210a708f8fSGustavo F. Padovan struct sk_buff *skb; 2222e4ca6d98SAndrei Emeltchenko int err, count, hlen; 22230a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 22240a708f8fSGustavo F. Padovan 2225b4400672SAndrei Emeltchenko BT_DBG("chan %p len %zu", chan, len); 22260a708f8fSGustavo F. Padovan 22270a708f8fSGustavo F. Padovan if (!conn) 22280a708f8fSGustavo F. Padovan return ERR_PTR(-ENOTCONN); 22290a708f8fSGustavo F. Padovan 2230ba7aa64fSGustavo Padovan hlen = __ertm_hdr_size(chan); 2231e4ca6d98SAndrei Emeltchenko 22320a708f8fSGustavo F. Padovan if (sdulen) 223303a51213SAndrei Emeltchenko hlen += L2CAP_SDULEN_SIZE; 22340a708f8fSGustavo F. Padovan 223547d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) 223603a51213SAndrei Emeltchenko hlen += L2CAP_FCS_SIZE; 22370a708f8fSGustavo F. Padovan 22380a708f8fSGustavo F. Padovan count = min_t(unsigned int, (conn->mtu - hlen), len); 22392f7719ceSAndrei Emeltchenko 22402f7719ceSAndrei Emeltchenko skb = chan->ops->alloc_skb(chan, count + hlen, 224190338947SGustavo Padovan msg->msg_flags & MSG_DONTWAIT); 224290338947SGustavo Padovan if (IS_ERR(skb)) 224390338947SGustavo Padovan return skb; 22440a708f8fSGustavo F. Padovan 22450a708f8fSGustavo F. Padovan /* Create L2CAP header */ 22460a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 2247fe4128e0SGustavo F. Padovan lh->cid = cpu_to_le16(chan->dcid); 22480a708f8fSGustavo F. Padovan lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); 224988843ab0SAndrei Emeltchenko 225018a48e76SMat Martineau /* Control header is populated later */ 225118a48e76SMat Martineau if (test_bit(FLAG_EXT_CTRL, &chan->flags)) 225218a48e76SMat Martineau put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); 225318a48e76SMat Martineau else 225418a48e76SMat Martineau put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); 225588843ab0SAndrei Emeltchenko 22560a708f8fSGustavo F. Padovan if (sdulen) 225703a51213SAndrei Emeltchenko put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE)); 22580a708f8fSGustavo F. Padovan 22590952a57aSAndrei Emeltchenko err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); 22600a708f8fSGustavo F. Padovan if (unlikely(err < 0)) { 22610a708f8fSGustavo F. Padovan kfree_skb(skb); 22620a708f8fSGustavo F. Padovan return ERR_PTR(err); 22630a708f8fSGustavo F. Padovan } 22640a708f8fSGustavo F. Padovan 226518a48e76SMat Martineau bt_cb(skb)->control.fcs = chan->fcs; 22663ce3514fSMat Martineau bt_cb(skb)->control.retries = 0; 22670a708f8fSGustavo F. Padovan return skb; 22680a708f8fSGustavo F. Padovan } 22690a708f8fSGustavo F. Padovan 227094122bbeSMat Martineau static int l2cap_segment_sdu(struct l2cap_chan *chan, 227194122bbeSMat Martineau struct sk_buff_head *seg_queue, 227294122bbeSMat Martineau struct msghdr *msg, size_t len) 22730a708f8fSGustavo F. Padovan { 22740a708f8fSGustavo F. Padovan struct sk_buff *skb; 227594122bbeSMat Martineau u16 sdu_len; 227694122bbeSMat Martineau size_t pdu_len; 227794122bbeSMat Martineau u8 sar; 22780a708f8fSGustavo F. Padovan 2279b4400672SAndrei Emeltchenko BT_DBG("chan %p, msg %p, len %zu", chan, msg, len); 22800a708f8fSGustavo F. Padovan 228194122bbeSMat Martineau /* It is critical that ERTM PDUs fit in a single HCI fragment, 228294122bbeSMat Martineau * so fragmented skbs are not used. The HCI layer's handling 228394122bbeSMat Martineau * of fragmented skbs is not compatible with ERTM's queueing. 228494122bbeSMat Martineau */ 228594122bbeSMat Martineau 228694122bbeSMat Martineau /* PDU size is derived from the HCI MTU */ 228794122bbeSMat Martineau pdu_len = chan->conn->mtu; 228894122bbeSMat Martineau 2289a549574dSMat Martineau /* Constrain PDU size for BR/EDR connections */ 2290a549574dSMat Martineau if (!chan->hs_hcon) 229194122bbeSMat Martineau pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD); 229294122bbeSMat Martineau 229394122bbeSMat Martineau /* Adjust for largest possible L2CAP overhead. */ 229435d401dfSGustavo Padovan if (chan->fcs) 229535d401dfSGustavo Padovan pdu_len -= L2CAP_FCS_SIZE; 229635d401dfSGustavo Padovan 2297ba7aa64fSGustavo Padovan pdu_len -= __ertm_hdr_size(chan); 229894122bbeSMat Martineau 229994122bbeSMat Martineau /* Remote device may have requested smaller PDUs */ 230094122bbeSMat Martineau pdu_len = min_t(size_t, pdu_len, chan->remote_mps); 230194122bbeSMat Martineau 230294122bbeSMat Martineau if (len <= pdu_len) { 230394122bbeSMat Martineau sar = L2CAP_SAR_UNSEGMENTED; 230494122bbeSMat Martineau sdu_len = 0; 230594122bbeSMat Martineau pdu_len = len; 230694122bbeSMat Martineau } else { 230794122bbeSMat Martineau sar = L2CAP_SAR_START; 230894122bbeSMat Martineau sdu_len = len; 230994122bbeSMat Martineau pdu_len -= L2CAP_SDULEN_SIZE; 231094122bbeSMat Martineau } 23110a708f8fSGustavo F. Padovan 23120a708f8fSGustavo F. Padovan while (len > 0) { 231394122bbeSMat Martineau skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len); 23140a708f8fSGustavo F. Padovan 23150a708f8fSGustavo F. Padovan if (IS_ERR(skb)) { 231694122bbeSMat Martineau __skb_queue_purge(seg_queue); 23170a708f8fSGustavo F. Padovan return PTR_ERR(skb); 23180a708f8fSGustavo F. Padovan } 23190a708f8fSGustavo F. Padovan 232094122bbeSMat Martineau bt_cb(skb)->control.sar = sar; 232194122bbeSMat Martineau __skb_queue_tail(seg_queue, skb); 23220a708f8fSGustavo F. Padovan 232394122bbeSMat Martineau len -= pdu_len; 232494122bbeSMat Martineau if (sdu_len) { 232594122bbeSMat Martineau sdu_len = 0; 232694122bbeSMat Martineau pdu_len += L2CAP_SDULEN_SIZE; 232794122bbeSMat Martineau } 232894122bbeSMat Martineau 232994122bbeSMat Martineau if (len <= pdu_len) { 233094122bbeSMat Martineau sar = L2CAP_SAR_END; 233194122bbeSMat Martineau pdu_len = len; 233294122bbeSMat Martineau } else { 233394122bbeSMat Martineau sar = L2CAP_SAR_CONTINUE; 233494122bbeSMat Martineau } 233594122bbeSMat Martineau } 233694122bbeSMat Martineau 2337f0f62799SGustavo Padovan return 0; 23380a708f8fSGustavo F. Padovan } 23390a708f8fSGustavo F. Padovan 23405e59b791SLuiz Augusto von Dentz int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len, 23415e59b791SLuiz Augusto von Dentz u32 priority) 23429a91a04aSGustavo F. Padovan { 23439a91a04aSGustavo F. Padovan struct sk_buff *skb; 23449a91a04aSGustavo F. Padovan int err; 234594122bbeSMat Martineau struct sk_buff_head seg_queue; 23469a91a04aSGustavo F. Padovan 23479a91a04aSGustavo F. Padovan /* Connectionless channel */ 2348715ec005SGustavo F. Padovan if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { 23495e59b791SLuiz Augusto von Dentz skb = l2cap_create_connless_pdu(chan, msg, len, priority); 23509a91a04aSGustavo F. Padovan if (IS_ERR(skb)) 23519a91a04aSGustavo F. Padovan return PTR_ERR(skb); 23529a91a04aSGustavo F. Padovan 23539a91a04aSGustavo F. Padovan l2cap_do_send(chan, skb); 23549a91a04aSGustavo F. Padovan return len; 23559a91a04aSGustavo F. Padovan } 23569a91a04aSGustavo F. Padovan 23579a91a04aSGustavo F. Padovan switch (chan->mode) { 23589a91a04aSGustavo F. Padovan case L2CAP_MODE_BASIC: 23599a91a04aSGustavo F. Padovan /* Check outgoing MTU */ 23609a91a04aSGustavo F. Padovan if (len > chan->omtu) 23619a91a04aSGustavo F. Padovan return -EMSGSIZE; 23629a91a04aSGustavo F. Padovan 23639a91a04aSGustavo F. Padovan /* Create a basic PDU */ 23645e59b791SLuiz Augusto von Dentz skb = l2cap_create_basic_pdu(chan, msg, len, priority); 23659a91a04aSGustavo F. Padovan if (IS_ERR(skb)) 23669a91a04aSGustavo F. Padovan return PTR_ERR(skb); 23679a91a04aSGustavo F. Padovan 23689a91a04aSGustavo F. Padovan l2cap_do_send(chan, skb); 23699a91a04aSGustavo F. Padovan err = len; 23709a91a04aSGustavo F. Padovan break; 23719a91a04aSGustavo F. Padovan 23729a91a04aSGustavo F. Padovan case L2CAP_MODE_ERTM: 23739a91a04aSGustavo F. Padovan case L2CAP_MODE_STREAMING: 237494122bbeSMat Martineau /* Check outgoing MTU */ 237594122bbeSMat Martineau if (len > chan->omtu) { 237694122bbeSMat Martineau err = -EMSGSIZE; 23779a91a04aSGustavo F. Padovan break; 23789a91a04aSGustavo F. Padovan } 23799a91a04aSGustavo F. Padovan 238094122bbeSMat Martineau __skb_queue_head_init(&seg_queue); 238194122bbeSMat Martineau 238294122bbeSMat Martineau /* Do segmentation before calling in to the state machine, 238394122bbeSMat Martineau * since it's possible to block while waiting for memory 238494122bbeSMat Martineau * allocation. 238594122bbeSMat Martineau */ 238694122bbeSMat Martineau err = l2cap_segment_sdu(chan, &seg_queue, msg, len); 238794122bbeSMat Martineau 238894122bbeSMat Martineau /* The channel could have been closed while segmenting, 238994122bbeSMat Martineau * check that it is still connected. 239094122bbeSMat Martineau */ 239194122bbeSMat Martineau if (chan->state != BT_CONNECTED) { 239294122bbeSMat Martineau __skb_queue_purge(&seg_queue); 239394122bbeSMat Martineau err = -ENOTCONN; 23949a91a04aSGustavo F. Padovan } 23959a91a04aSGustavo F. Padovan 239694122bbeSMat Martineau if (err) 239794122bbeSMat Martineau break; 239894122bbeSMat Martineau 23993733937dSMat Martineau if (chan->mode == L2CAP_MODE_ERTM) 2400d660366dSGustavo Padovan l2cap_tx(chan, NULL, &seg_queue, L2CAP_EV_DATA_REQUEST); 24013733937dSMat Martineau else 2402d660366dSGustavo Padovan l2cap_streaming_send(chan, &seg_queue); 240394122bbeSMat Martineau 24049a91a04aSGustavo F. Padovan err = len; 24059a91a04aSGustavo F. Padovan 240694122bbeSMat Martineau /* If the skbs were not queued for sending, they'll still be in 240794122bbeSMat Martineau * seg_queue and need to be purged. 240894122bbeSMat Martineau */ 240994122bbeSMat Martineau __skb_queue_purge(&seg_queue); 24109a91a04aSGustavo F. Padovan break; 24119a91a04aSGustavo F. Padovan 24129a91a04aSGustavo F. Padovan default: 24139a91a04aSGustavo F. Padovan BT_DBG("bad state %1.1x", chan->mode); 24149a91a04aSGustavo F. Padovan err = -EBADFD; 24159a91a04aSGustavo F. Padovan } 24169a91a04aSGustavo F. Padovan 24179a91a04aSGustavo F. Padovan return err; 24189a91a04aSGustavo F. Padovan } 24199a91a04aSGustavo F. Padovan 2420d2a7ac5dSMat Martineau static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq) 2421d2a7ac5dSMat Martineau { 2422bed68bdeSMat Martineau struct l2cap_ctrl control; 2423bed68bdeSMat Martineau u16 seq; 2424bed68bdeSMat Martineau 2425b4400672SAndrei Emeltchenko BT_DBG("chan %p, txseq %u", chan, txseq); 2426bed68bdeSMat Martineau 2427bed68bdeSMat Martineau memset(&control, 0, sizeof(control)); 2428bed68bdeSMat Martineau control.sframe = 1; 2429bed68bdeSMat Martineau control.super = L2CAP_SUPER_SREJ; 2430bed68bdeSMat Martineau 2431bed68bdeSMat Martineau for (seq = chan->expected_tx_seq; seq != txseq; 2432bed68bdeSMat Martineau seq = __next_seq(chan, seq)) { 2433bed68bdeSMat Martineau if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) { 2434bed68bdeSMat Martineau control.reqseq = seq; 2435bed68bdeSMat Martineau l2cap_send_sframe(chan, &control); 2436bed68bdeSMat Martineau l2cap_seq_list_append(&chan->srej_list, seq); 2437bed68bdeSMat Martineau } 2438bed68bdeSMat Martineau } 2439bed68bdeSMat Martineau 2440bed68bdeSMat Martineau chan->expected_tx_seq = __next_seq(chan, txseq); 2441d2a7ac5dSMat Martineau } 2442d2a7ac5dSMat Martineau 2443d2a7ac5dSMat Martineau static void l2cap_send_srej_tail(struct l2cap_chan *chan) 2444d2a7ac5dSMat Martineau { 2445bed68bdeSMat Martineau struct l2cap_ctrl control; 2446bed68bdeSMat Martineau 2447bed68bdeSMat Martineau BT_DBG("chan %p", chan); 2448bed68bdeSMat Martineau 2449bed68bdeSMat Martineau if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR) 2450bed68bdeSMat Martineau return; 2451bed68bdeSMat Martineau 2452bed68bdeSMat Martineau memset(&control, 0, sizeof(control)); 2453bed68bdeSMat Martineau control.sframe = 1; 2454bed68bdeSMat Martineau control.super = L2CAP_SUPER_SREJ; 2455bed68bdeSMat Martineau control.reqseq = chan->srej_list.tail; 2456bed68bdeSMat Martineau l2cap_send_sframe(chan, &control); 2457d2a7ac5dSMat Martineau } 2458d2a7ac5dSMat Martineau 2459d2a7ac5dSMat Martineau static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq) 2460d2a7ac5dSMat Martineau { 2461bed68bdeSMat Martineau struct l2cap_ctrl control; 2462bed68bdeSMat Martineau u16 initial_head; 2463bed68bdeSMat Martineau u16 seq; 2464bed68bdeSMat Martineau 2465b4400672SAndrei Emeltchenko BT_DBG("chan %p, txseq %u", chan, txseq); 2466bed68bdeSMat Martineau 2467bed68bdeSMat Martineau memset(&control, 0, sizeof(control)); 2468bed68bdeSMat Martineau control.sframe = 1; 2469bed68bdeSMat Martineau control.super = L2CAP_SUPER_SREJ; 2470bed68bdeSMat Martineau 2471bed68bdeSMat Martineau /* Capture initial list head to allow only one pass through the list. */ 2472bed68bdeSMat Martineau initial_head = chan->srej_list.head; 2473bed68bdeSMat Martineau 2474bed68bdeSMat Martineau do { 2475bed68bdeSMat Martineau seq = l2cap_seq_list_pop(&chan->srej_list); 2476bed68bdeSMat Martineau if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR) 2477bed68bdeSMat Martineau break; 2478bed68bdeSMat Martineau 2479bed68bdeSMat Martineau control.reqseq = seq; 2480bed68bdeSMat Martineau l2cap_send_sframe(chan, &control); 2481bed68bdeSMat Martineau l2cap_seq_list_append(&chan->srej_list, seq); 2482bed68bdeSMat Martineau } while (chan->srej_list.head != initial_head); 2483d2a7ac5dSMat Martineau } 2484d2a7ac5dSMat Martineau 2485608bcc6dSMat Martineau static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq) 2486608bcc6dSMat Martineau { 2487608bcc6dSMat Martineau struct sk_buff *acked_skb; 2488608bcc6dSMat Martineau u16 ackseq; 2489608bcc6dSMat Martineau 2490b4400672SAndrei Emeltchenko BT_DBG("chan %p, reqseq %u", chan, reqseq); 2491608bcc6dSMat Martineau 2492608bcc6dSMat Martineau if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq) 2493608bcc6dSMat Martineau return; 2494608bcc6dSMat Martineau 2495b4400672SAndrei Emeltchenko BT_DBG("expected_ack_seq %u, unacked_frames %u", 2496608bcc6dSMat Martineau chan->expected_ack_seq, chan->unacked_frames); 2497608bcc6dSMat Martineau 2498608bcc6dSMat Martineau for (ackseq = chan->expected_ack_seq; ackseq != reqseq; 2499608bcc6dSMat Martineau ackseq = __next_seq(chan, ackseq)) { 2500608bcc6dSMat Martineau 2501608bcc6dSMat Martineau acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq); 2502608bcc6dSMat Martineau if (acked_skb) { 2503608bcc6dSMat Martineau skb_unlink(acked_skb, &chan->tx_q); 2504608bcc6dSMat Martineau kfree_skb(acked_skb); 2505608bcc6dSMat Martineau chan->unacked_frames--; 2506608bcc6dSMat Martineau } 2507608bcc6dSMat Martineau } 2508608bcc6dSMat Martineau 2509608bcc6dSMat Martineau chan->expected_ack_seq = reqseq; 2510608bcc6dSMat Martineau 2511608bcc6dSMat Martineau if (chan->unacked_frames == 0) 2512608bcc6dSMat Martineau __clear_retrans_timer(chan); 2513608bcc6dSMat Martineau 2514b4400672SAndrei Emeltchenko BT_DBG("unacked_frames %u", chan->unacked_frames); 2515608bcc6dSMat Martineau } 2516608bcc6dSMat Martineau 2517608bcc6dSMat Martineau static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan) 2518608bcc6dSMat Martineau { 2519608bcc6dSMat Martineau BT_DBG("chan %p", chan); 2520608bcc6dSMat Martineau 2521608bcc6dSMat Martineau chan->expected_tx_seq = chan->buffer_seq; 2522608bcc6dSMat Martineau l2cap_seq_list_clear(&chan->srej_list); 2523608bcc6dSMat Martineau skb_queue_purge(&chan->srej_q); 2524608bcc6dSMat Martineau chan->rx_state = L2CAP_RX_STATE_RECV; 2525608bcc6dSMat Martineau } 2526608bcc6dSMat Martineau 2527d660366dSGustavo Padovan static void l2cap_tx_state_xmit(struct l2cap_chan *chan, 2528608bcc6dSMat Martineau struct l2cap_ctrl *control, 2529608bcc6dSMat Martineau struct sk_buff_head *skbs, u8 event) 2530608bcc6dSMat Martineau { 2531608bcc6dSMat Martineau BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, 2532608bcc6dSMat Martineau event); 2533608bcc6dSMat Martineau 2534608bcc6dSMat Martineau switch (event) { 2535608bcc6dSMat Martineau case L2CAP_EV_DATA_REQUEST: 2536608bcc6dSMat Martineau if (chan->tx_send_head == NULL) 2537608bcc6dSMat Martineau chan->tx_send_head = skb_peek(skbs); 2538608bcc6dSMat Martineau 2539608bcc6dSMat Martineau skb_queue_splice_tail_init(skbs, &chan->tx_q); 2540608bcc6dSMat Martineau l2cap_ertm_send(chan); 2541608bcc6dSMat Martineau break; 2542608bcc6dSMat Martineau case L2CAP_EV_LOCAL_BUSY_DETECTED: 2543608bcc6dSMat Martineau BT_DBG("Enter LOCAL_BUSY"); 2544608bcc6dSMat Martineau set_bit(CONN_LOCAL_BUSY, &chan->conn_state); 2545608bcc6dSMat Martineau 2546608bcc6dSMat Martineau if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { 2547608bcc6dSMat Martineau /* The SREJ_SENT state must be aborted if we are to 2548608bcc6dSMat Martineau * enter the LOCAL_BUSY state. 2549608bcc6dSMat Martineau */ 2550608bcc6dSMat Martineau l2cap_abort_rx_srej_sent(chan); 2551608bcc6dSMat Martineau } 2552608bcc6dSMat Martineau 2553608bcc6dSMat Martineau l2cap_send_ack(chan); 2554608bcc6dSMat Martineau 2555608bcc6dSMat Martineau break; 2556608bcc6dSMat Martineau case L2CAP_EV_LOCAL_BUSY_CLEAR: 2557608bcc6dSMat Martineau BT_DBG("Exit LOCAL_BUSY"); 2558608bcc6dSMat Martineau clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); 2559608bcc6dSMat Martineau 2560608bcc6dSMat Martineau if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { 2561608bcc6dSMat Martineau struct l2cap_ctrl local_control; 2562608bcc6dSMat Martineau 2563608bcc6dSMat Martineau memset(&local_control, 0, sizeof(local_control)); 2564608bcc6dSMat Martineau local_control.sframe = 1; 2565608bcc6dSMat Martineau local_control.super = L2CAP_SUPER_RR; 2566608bcc6dSMat Martineau local_control.poll = 1; 2567608bcc6dSMat Martineau local_control.reqseq = chan->buffer_seq; 2568a67d7f6fSMat Martineau l2cap_send_sframe(chan, &local_control); 2569608bcc6dSMat Martineau 2570608bcc6dSMat Martineau chan->retry_count = 1; 2571608bcc6dSMat Martineau __set_monitor_timer(chan); 2572608bcc6dSMat Martineau chan->tx_state = L2CAP_TX_STATE_WAIT_F; 2573608bcc6dSMat Martineau } 2574608bcc6dSMat Martineau break; 2575608bcc6dSMat Martineau case L2CAP_EV_RECV_REQSEQ_AND_FBIT: 2576608bcc6dSMat Martineau l2cap_process_reqseq(chan, control->reqseq); 2577608bcc6dSMat Martineau break; 2578608bcc6dSMat Martineau case L2CAP_EV_EXPLICIT_POLL: 2579608bcc6dSMat Martineau l2cap_send_rr_or_rnr(chan, 1); 2580608bcc6dSMat Martineau chan->retry_count = 1; 2581608bcc6dSMat Martineau __set_monitor_timer(chan); 2582608bcc6dSMat Martineau __clear_ack_timer(chan); 2583608bcc6dSMat Martineau chan->tx_state = L2CAP_TX_STATE_WAIT_F; 2584608bcc6dSMat Martineau break; 2585608bcc6dSMat Martineau case L2CAP_EV_RETRANS_TO: 2586608bcc6dSMat Martineau l2cap_send_rr_or_rnr(chan, 1); 2587608bcc6dSMat Martineau chan->retry_count = 1; 2588608bcc6dSMat Martineau __set_monitor_timer(chan); 2589608bcc6dSMat Martineau chan->tx_state = L2CAP_TX_STATE_WAIT_F; 2590608bcc6dSMat Martineau break; 2591608bcc6dSMat Martineau case L2CAP_EV_RECV_FBIT: 2592608bcc6dSMat Martineau /* Nothing to process */ 2593608bcc6dSMat Martineau break; 2594608bcc6dSMat Martineau default: 2595608bcc6dSMat Martineau break; 2596608bcc6dSMat Martineau } 2597608bcc6dSMat Martineau } 2598608bcc6dSMat Martineau 2599d660366dSGustavo Padovan static void l2cap_tx_state_wait_f(struct l2cap_chan *chan, 2600608bcc6dSMat Martineau struct l2cap_ctrl *control, 2601608bcc6dSMat Martineau struct sk_buff_head *skbs, u8 event) 2602608bcc6dSMat Martineau { 2603608bcc6dSMat Martineau BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, 2604608bcc6dSMat Martineau event); 2605608bcc6dSMat Martineau 2606608bcc6dSMat Martineau switch (event) { 2607608bcc6dSMat Martineau case L2CAP_EV_DATA_REQUEST: 2608608bcc6dSMat Martineau if (chan->tx_send_head == NULL) 2609608bcc6dSMat Martineau chan->tx_send_head = skb_peek(skbs); 2610608bcc6dSMat Martineau /* Queue data, but don't send. */ 2611608bcc6dSMat Martineau skb_queue_splice_tail_init(skbs, &chan->tx_q); 2612608bcc6dSMat Martineau break; 2613608bcc6dSMat Martineau case L2CAP_EV_LOCAL_BUSY_DETECTED: 2614608bcc6dSMat Martineau BT_DBG("Enter LOCAL_BUSY"); 2615608bcc6dSMat Martineau set_bit(CONN_LOCAL_BUSY, &chan->conn_state); 2616608bcc6dSMat Martineau 2617608bcc6dSMat Martineau if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { 2618608bcc6dSMat Martineau /* The SREJ_SENT state must be aborted if we are to 2619608bcc6dSMat Martineau * enter the LOCAL_BUSY state. 2620608bcc6dSMat Martineau */ 2621608bcc6dSMat Martineau l2cap_abort_rx_srej_sent(chan); 2622608bcc6dSMat Martineau } 2623608bcc6dSMat Martineau 2624608bcc6dSMat Martineau l2cap_send_ack(chan); 2625608bcc6dSMat Martineau 2626608bcc6dSMat Martineau break; 2627608bcc6dSMat Martineau case L2CAP_EV_LOCAL_BUSY_CLEAR: 2628608bcc6dSMat Martineau BT_DBG("Exit LOCAL_BUSY"); 2629608bcc6dSMat Martineau clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); 2630608bcc6dSMat Martineau 2631608bcc6dSMat Martineau if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { 2632608bcc6dSMat Martineau struct l2cap_ctrl local_control; 2633608bcc6dSMat Martineau memset(&local_control, 0, sizeof(local_control)); 2634608bcc6dSMat Martineau local_control.sframe = 1; 2635608bcc6dSMat Martineau local_control.super = L2CAP_SUPER_RR; 2636608bcc6dSMat Martineau local_control.poll = 1; 2637608bcc6dSMat Martineau local_control.reqseq = chan->buffer_seq; 2638a67d7f6fSMat Martineau l2cap_send_sframe(chan, &local_control); 2639608bcc6dSMat Martineau 2640608bcc6dSMat Martineau chan->retry_count = 1; 2641608bcc6dSMat Martineau __set_monitor_timer(chan); 2642608bcc6dSMat Martineau chan->tx_state = L2CAP_TX_STATE_WAIT_F; 2643608bcc6dSMat Martineau } 2644608bcc6dSMat Martineau break; 2645608bcc6dSMat Martineau case L2CAP_EV_RECV_REQSEQ_AND_FBIT: 2646608bcc6dSMat Martineau l2cap_process_reqseq(chan, control->reqseq); 2647608bcc6dSMat Martineau 2648608bcc6dSMat Martineau /* Fall through */ 2649608bcc6dSMat Martineau 2650608bcc6dSMat Martineau case L2CAP_EV_RECV_FBIT: 2651608bcc6dSMat Martineau if (control && control->final) { 2652608bcc6dSMat Martineau __clear_monitor_timer(chan); 2653608bcc6dSMat Martineau if (chan->unacked_frames > 0) 2654608bcc6dSMat Martineau __set_retrans_timer(chan); 2655608bcc6dSMat Martineau chan->retry_count = 0; 2656608bcc6dSMat Martineau chan->tx_state = L2CAP_TX_STATE_XMIT; 2657608bcc6dSMat Martineau BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state); 2658608bcc6dSMat Martineau } 2659608bcc6dSMat Martineau break; 2660608bcc6dSMat Martineau case L2CAP_EV_EXPLICIT_POLL: 2661608bcc6dSMat Martineau /* Ignore */ 2662608bcc6dSMat Martineau break; 2663608bcc6dSMat Martineau case L2CAP_EV_MONITOR_TO: 2664608bcc6dSMat Martineau if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) { 2665608bcc6dSMat Martineau l2cap_send_rr_or_rnr(chan, 1); 2666608bcc6dSMat Martineau __set_monitor_timer(chan); 2667608bcc6dSMat Martineau chan->retry_count++; 2668608bcc6dSMat Martineau } else { 26695e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNABORTED); 2670608bcc6dSMat Martineau } 2671608bcc6dSMat Martineau break; 2672608bcc6dSMat Martineau default: 2673608bcc6dSMat Martineau break; 2674608bcc6dSMat Martineau } 2675608bcc6dSMat Martineau } 2676608bcc6dSMat Martineau 2677d660366dSGustavo Padovan static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, 2678608bcc6dSMat Martineau struct sk_buff_head *skbs, u8 event) 2679608bcc6dSMat Martineau { 2680608bcc6dSMat Martineau BT_DBG("chan %p, control %p, skbs %p, event %d, state %d", 2681608bcc6dSMat Martineau chan, control, skbs, event, chan->tx_state); 2682608bcc6dSMat Martineau 2683608bcc6dSMat Martineau switch (chan->tx_state) { 2684608bcc6dSMat Martineau case L2CAP_TX_STATE_XMIT: 2685d660366dSGustavo Padovan l2cap_tx_state_xmit(chan, control, skbs, event); 2686608bcc6dSMat Martineau break; 2687608bcc6dSMat Martineau case L2CAP_TX_STATE_WAIT_F: 2688d660366dSGustavo Padovan l2cap_tx_state_wait_f(chan, control, skbs, event); 2689608bcc6dSMat Martineau break; 2690608bcc6dSMat Martineau default: 2691608bcc6dSMat Martineau /* Ignore event */ 2692608bcc6dSMat Martineau break; 2693608bcc6dSMat Martineau } 2694608bcc6dSMat Martineau } 2695608bcc6dSMat Martineau 26964b51dae9SMat Martineau static void l2cap_pass_to_tx(struct l2cap_chan *chan, 26974b51dae9SMat Martineau struct l2cap_ctrl *control) 26984b51dae9SMat Martineau { 26994b51dae9SMat Martineau BT_DBG("chan %p, control %p", chan, control); 2700401bb1f7SAndrei Emeltchenko l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_REQSEQ_AND_FBIT); 27014b51dae9SMat Martineau } 27024b51dae9SMat Martineau 2703f80842a8SMat Martineau static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan, 2704f80842a8SMat Martineau struct l2cap_ctrl *control) 2705f80842a8SMat Martineau { 2706f80842a8SMat Martineau BT_DBG("chan %p, control %p", chan, control); 2707401bb1f7SAndrei Emeltchenko l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_FBIT); 2708f80842a8SMat Martineau } 2709f80842a8SMat Martineau 27100a708f8fSGustavo F. Padovan /* Copy frame to all raw sockets on that connection */ 27110a708f8fSGustavo F. Padovan static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) 27120a708f8fSGustavo F. Padovan { 27130a708f8fSGustavo F. Padovan struct sk_buff *nskb; 271448454079SGustavo F. Padovan struct l2cap_chan *chan; 27150a708f8fSGustavo F. Padovan 27160a708f8fSGustavo F. Padovan BT_DBG("conn %p", conn); 27170a708f8fSGustavo F. Padovan 27183df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 27193d57dc68SGustavo F. Padovan 27203df91ea2SAndrei Emeltchenko list_for_each_entry(chan, &conn->chan_l, list) { 272148454079SGustavo F. Padovan struct sock *sk = chan->sk; 2722715ec005SGustavo F. Padovan if (chan->chan_type != L2CAP_CHAN_RAW) 27230a708f8fSGustavo F. Padovan continue; 27240a708f8fSGustavo F. Padovan 27250a708f8fSGustavo F. Padovan /* Don't send frame to the socket it came from */ 27260a708f8fSGustavo F. Padovan if (skb->sk == sk) 27270a708f8fSGustavo F. Padovan continue; 27288bcde1f2SGustavo Padovan nskb = skb_clone(skb, GFP_KERNEL); 27290a708f8fSGustavo F. Padovan if (!nskb) 27300a708f8fSGustavo F. Padovan continue; 27310a708f8fSGustavo F. Padovan 273280b98027SGustavo Padovan if (chan->ops->recv(chan, nskb)) 27330a708f8fSGustavo F. Padovan kfree_skb(nskb); 27340a708f8fSGustavo F. Padovan } 27353d57dc68SGustavo F. Padovan 27363df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 27370a708f8fSGustavo F. Padovan } 27380a708f8fSGustavo F. Padovan 27390a708f8fSGustavo F. Padovan /* ---- L2CAP signalling commands ---- */ 2740b4400672SAndrei Emeltchenko static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code, 2741b4400672SAndrei Emeltchenko u8 ident, u16 dlen, void *data) 27420a708f8fSGustavo F. Padovan { 27430a708f8fSGustavo F. Padovan struct sk_buff *skb, **frag; 27440a708f8fSGustavo F. Padovan struct l2cap_cmd_hdr *cmd; 27450a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 27460a708f8fSGustavo F. Padovan int len, count; 27470a708f8fSGustavo F. Padovan 2748b4400672SAndrei Emeltchenko BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %u", 27490a708f8fSGustavo F. Padovan conn, code, ident, dlen); 27500a708f8fSGustavo F. Padovan 27510a708f8fSGustavo F. Padovan len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; 27520a708f8fSGustavo F. Padovan count = min_t(unsigned int, conn->mtu, len); 27530a708f8fSGustavo F. Padovan 27548bcde1f2SGustavo Padovan skb = bt_skb_alloc(count, GFP_KERNEL); 27550a708f8fSGustavo F. Padovan if (!skb) 27560a708f8fSGustavo F. Padovan return NULL; 27570a708f8fSGustavo F. Padovan 27580a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 27590a708f8fSGustavo F. Padovan lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); 27603300d9a9SClaudio Takahasi 27613300d9a9SClaudio Takahasi if (conn->hcon->type == LE_LINK) 2762ac73498cSAndrei Emeltchenko lh->cid = __constant_cpu_to_le16(L2CAP_CID_LE_SIGNALING); 27633300d9a9SClaudio Takahasi else 2764ac73498cSAndrei Emeltchenko lh->cid = __constant_cpu_to_le16(L2CAP_CID_SIGNALING); 27650a708f8fSGustavo F. Padovan 27660a708f8fSGustavo F. Padovan cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); 27670a708f8fSGustavo F. Padovan cmd->code = code; 27680a708f8fSGustavo F. Padovan cmd->ident = ident; 27690a708f8fSGustavo F. Padovan cmd->len = cpu_to_le16(dlen); 27700a708f8fSGustavo F. Padovan 27710a708f8fSGustavo F. Padovan if (dlen) { 27720a708f8fSGustavo F. Padovan count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; 27730a708f8fSGustavo F. Padovan memcpy(skb_put(skb, count), data, count); 27740a708f8fSGustavo F. Padovan data += count; 27750a708f8fSGustavo F. Padovan } 27760a708f8fSGustavo F. Padovan 27770a708f8fSGustavo F. Padovan len -= skb->len; 27780a708f8fSGustavo F. Padovan 27790a708f8fSGustavo F. Padovan /* Continuation fragments (no L2CAP header) */ 27800a708f8fSGustavo F. Padovan frag = &skb_shinfo(skb)->frag_list; 27810a708f8fSGustavo F. Padovan while (len) { 27820a708f8fSGustavo F. Padovan count = min_t(unsigned int, conn->mtu, len); 27830a708f8fSGustavo F. Padovan 27848bcde1f2SGustavo Padovan *frag = bt_skb_alloc(count, GFP_KERNEL); 27850a708f8fSGustavo F. Padovan if (!*frag) 27860a708f8fSGustavo F. Padovan goto fail; 27870a708f8fSGustavo F. Padovan 27880a708f8fSGustavo F. Padovan memcpy(skb_put(*frag, count), data, count); 27890a708f8fSGustavo F. Padovan 27900a708f8fSGustavo F. Padovan len -= count; 27910a708f8fSGustavo F. Padovan data += count; 27920a708f8fSGustavo F. Padovan 27930a708f8fSGustavo F. Padovan frag = &(*frag)->next; 27940a708f8fSGustavo F. Padovan } 27950a708f8fSGustavo F. Padovan 27960a708f8fSGustavo F. Padovan return skb; 27970a708f8fSGustavo F. Padovan 27980a708f8fSGustavo F. Padovan fail: 27990a708f8fSGustavo F. Padovan kfree_skb(skb); 28000a708f8fSGustavo F. Padovan return NULL; 28010a708f8fSGustavo F. Padovan } 28020a708f8fSGustavo F. Padovan 28032d792818SGustavo Padovan static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, 28042d792818SGustavo Padovan unsigned long *val) 28050a708f8fSGustavo F. Padovan { 28060a708f8fSGustavo F. Padovan struct l2cap_conf_opt *opt = *ptr; 28070a708f8fSGustavo F. Padovan int len; 28080a708f8fSGustavo F. Padovan 28090a708f8fSGustavo F. Padovan len = L2CAP_CONF_OPT_SIZE + opt->len; 28100a708f8fSGustavo F. Padovan *ptr += len; 28110a708f8fSGustavo F. Padovan 28120a708f8fSGustavo F. Padovan *type = opt->type; 28130a708f8fSGustavo F. Padovan *olen = opt->len; 28140a708f8fSGustavo F. Padovan 28150a708f8fSGustavo F. Padovan switch (opt->len) { 28160a708f8fSGustavo F. Padovan case 1: 28170a708f8fSGustavo F. Padovan *val = *((u8 *) opt->val); 28180a708f8fSGustavo F. Padovan break; 28190a708f8fSGustavo F. Padovan 28200a708f8fSGustavo F. Padovan case 2: 28210a708f8fSGustavo F. Padovan *val = get_unaligned_le16(opt->val); 28220a708f8fSGustavo F. Padovan break; 28230a708f8fSGustavo F. Padovan 28240a708f8fSGustavo F. Padovan case 4: 28250a708f8fSGustavo F. Padovan *val = get_unaligned_le32(opt->val); 28260a708f8fSGustavo F. Padovan break; 28270a708f8fSGustavo F. Padovan 28280a708f8fSGustavo F. Padovan default: 28290a708f8fSGustavo F. Padovan *val = (unsigned long) opt->val; 28300a708f8fSGustavo F. Padovan break; 28310a708f8fSGustavo F. Padovan } 28320a708f8fSGustavo F. Padovan 2833b4400672SAndrei Emeltchenko BT_DBG("type 0x%2.2x len %u val 0x%lx", *type, opt->len, *val); 28340a708f8fSGustavo F. Padovan return len; 28350a708f8fSGustavo F. Padovan } 28360a708f8fSGustavo F. Padovan 28370a708f8fSGustavo F. Padovan static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) 28380a708f8fSGustavo F. Padovan { 28390a708f8fSGustavo F. Padovan struct l2cap_conf_opt *opt = *ptr; 28400a708f8fSGustavo F. Padovan 2841b4400672SAndrei Emeltchenko BT_DBG("type 0x%2.2x len %u val 0x%lx", type, len, val); 28420a708f8fSGustavo F. Padovan 28430a708f8fSGustavo F. Padovan opt->type = type; 28440a708f8fSGustavo F. Padovan opt->len = len; 28450a708f8fSGustavo F. Padovan 28460a708f8fSGustavo F. Padovan switch (len) { 28470a708f8fSGustavo F. Padovan case 1: 28480a708f8fSGustavo F. Padovan *((u8 *) opt->val) = val; 28490a708f8fSGustavo F. Padovan break; 28500a708f8fSGustavo F. Padovan 28510a708f8fSGustavo F. Padovan case 2: 28520a708f8fSGustavo F. Padovan put_unaligned_le16(val, opt->val); 28530a708f8fSGustavo F. Padovan break; 28540a708f8fSGustavo F. Padovan 28550a708f8fSGustavo F. Padovan case 4: 28560a708f8fSGustavo F. Padovan put_unaligned_le32(val, opt->val); 28570a708f8fSGustavo F. Padovan break; 28580a708f8fSGustavo F. Padovan 28590a708f8fSGustavo F. Padovan default: 28600a708f8fSGustavo F. Padovan memcpy(opt->val, (void *) val, len); 28610a708f8fSGustavo F. Padovan break; 28620a708f8fSGustavo F. Padovan } 28630a708f8fSGustavo F. Padovan 28640a708f8fSGustavo F. Padovan *ptr += L2CAP_CONF_OPT_SIZE + len; 28650a708f8fSGustavo F. Padovan } 28660a708f8fSGustavo F. Padovan 2867f89cef09SAndrei Emeltchenko static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan) 2868f89cef09SAndrei Emeltchenko { 2869f89cef09SAndrei Emeltchenko struct l2cap_conf_efs efs; 2870f89cef09SAndrei Emeltchenko 2871f89cef09SAndrei Emeltchenko switch (chan->mode) { 2872f89cef09SAndrei Emeltchenko case L2CAP_MODE_ERTM: 2873f89cef09SAndrei Emeltchenko efs.id = chan->local_id; 2874f89cef09SAndrei Emeltchenko efs.stype = chan->local_stype; 2875f89cef09SAndrei Emeltchenko efs.msdu = cpu_to_le16(chan->local_msdu); 2876f89cef09SAndrei Emeltchenko efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); 2877ac73498cSAndrei Emeltchenko efs.acc_lat = __constant_cpu_to_le32(L2CAP_DEFAULT_ACC_LAT); 28788936fa6dSAndrei Emeltchenko efs.flush_to = __constant_cpu_to_le32(L2CAP_EFS_DEFAULT_FLUSH_TO); 2879f89cef09SAndrei Emeltchenko break; 2880f89cef09SAndrei Emeltchenko 2881f89cef09SAndrei Emeltchenko case L2CAP_MODE_STREAMING: 2882f89cef09SAndrei Emeltchenko efs.id = 1; 2883f89cef09SAndrei Emeltchenko efs.stype = L2CAP_SERV_BESTEFFORT; 2884f89cef09SAndrei Emeltchenko efs.msdu = cpu_to_le16(chan->local_msdu); 2885f89cef09SAndrei Emeltchenko efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); 2886f89cef09SAndrei Emeltchenko efs.acc_lat = 0; 2887f89cef09SAndrei Emeltchenko efs.flush_to = 0; 2888f89cef09SAndrei Emeltchenko break; 2889f89cef09SAndrei Emeltchenko 2890f89cef09SAndrei Emeltchenko default: 2891f89cef09SAndrei Emeltchenko return; 2892f89cef09SAndrei Emeltchenko } 2893f89cef09SAndrei Emeltchenko 2894f89cef09SAndrei Emeltchenko l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs), 2895f89cef09SAndrei Emeltchenko (unsigned long) &efs); 2896f89cef09SAndrei Emeltchenko } 2897f89cef09SAndrei Emeltchenko 2898721c4181SGustavo F. Padovan static void l2cap_ack_timeout(struct work_struct *work) 28990a708f8fSGustavo F. Padovan { 2900721c4181SGustavo F. Padovan struct l2cap_chan *chan = container_of(work, struct l2cap_chan, 2901721c4181SGustavo F. Padovan ack_timer.work); 29020362520bSMat Martineau u16 frames_to_ack; 29030a708f8fSGustavo F. Padovan 29042fb9b3d4SGustavo F. Padovan BT_DBG("chan %p", chan); 29052fb9b3d4SGustavo F. Padovan 29066be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 29076be36555SAndrei Emeltchenko 29080362520bSMat Martineau frames_to_ack = __seq_offset(chan, chan->buffer_seq, 29090362520bSMat Martineau chan->last_acked_seq); 29100362520bSMat Martineau 29110362520bSMat Martineau if (frames_to_ack) 29120362520bSMat Martineau l2cap_send_rr_or_rnr(chan, 0); 29136be36555SAndrei Emeltchenko 29146be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 291509bfb2eeSSzymon Janc l2cap_chan_put(chan); 29160a708f8fSGustavo F. Padovan } 29170a708f8fSGustavo F. Padovan 2918466f8004SAndrei Emeltchenko int l2cap_ertm_init(struct l2cap_chan *chan) 29190a708f8fSGustavo F. Padovan { 29203c588192SMat Martineau int err; 29213c588192SMat Martineau 2922105bdf9eSMat Martineau chan->next_tx_seq = 0; 2923105bdf9eSMat Martineau chan->expected_tx_seq = 0; 292442e5c802SGustavo F. Padovan chan->expected_ack_seq = 0; 29256a026610SGustavo F. Padovan chan->unacked_frames = 0; 292642e5c802SGustavo F. Padovan chan->buffer_seq = 0; 29276a026610SGustavo F. Padovan chan->frames_sent = 0; 2928105bdf9eSMat Martineau chan->last_acked_seq = 0; 2929105bdf9eSMat Martineau chan->sdu = NULL; 2930105bdf9eSMat Martineau chan->sdu_last_frag = NULL; 2931105bdf9eSMat Martineau chan->sdu_len = 0; 2932105bdf9eSMat Martineau 2933d34c34fbSMat Martineau skb_queue_head_init(&chan->tx_q); 2934d34c34fbSMat Martineau 293508333283SMat Martineau chan->local_amp_id = 0; 293608333283SMat Martineau chan->move_id = 0; 293708333283SMat Martineau chan->move_state = L2CAP_MOVE_STABLE; 293808333283SMat Martineau chan->move_role = L2CAP_MOVE_ROLE_NONE; 293908333283SMat Martineau 2940105bdf9eSMat Martineau if (chan->mode != L2CAP_MODE_ERTM) 2941105bdf9eSMat Martineau return 0; 2942105bdf9eSMat Martineau 2943105bdf9eSMat Martineau chan->rx_state = L2CAP_RX_STATE_RECV; 2944105bdf9eSMat Martineau chan->tx_state = L2CAP_TX_STATE_XMIT; 29450a708f8fSGustavo F. Padovan 2946721c4181SGustavo F. Padovan INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout); 2947721c4181SGustavo F. Padovan INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout); 2948721c4181SGustavo F. Padovan INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout); 29490a708f8fSGustavo F. Padovan 2950f1c6775bSGustavo F. Padovan skb_queue_head_init(&chan->srej_q); 29510a708f8fSGustavo F. Padovan 29523c588192SMat Martineau err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win); 29533c588192SMat Martineau if (err < 0) 29543c588192SMat Martineau return err; 29553c588192SMat Martineau 29569dc9affcSMat Martineau err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win); 29579dc9affcSMat Martineau if (err < 0) 29589dc9affcSMat Martineau l2cap_seq_list_free(&chan->srej_list); 29599dc9affcSMat Martineau 29609dc9affcSMat Martineau return err; 29610a708f8fSGustavo F. Padovan } 29620a708f8fSGustavo F. Padovan 29630a708f8fSGustavo F. Padovan static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) 29640a708f8fSGustavo F. Padovan { 29650a708f8fSGustavo F. Padovan switch (mode) { 29660a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 29670a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 29680a708f8fSGustavo F. Padovan if (l2cap_mode_supported(mode, remote_feat_mask)) 29690a708f8fSGustavo F. Padovan return mode; 29700a708f8fSGustavo F. Padovan /* fall through */ 29710a708f8fSGustavo F. Padovan default: 29720a708f8fSGustavo F. Padovan return L2CAP_MODE_BASIC; 29730a708f8fSGustavo F. Padovan } 29740a708f8fSGustavo F. Padovan } 29750a708f8fSGustavo F. Padovan 29766327eb98SAndrei Emeltchenko static inline bool __l2cap_ews_supported(struct l2cap_chan *chan) 29776327eb98SAndrei Emeltchenko { 29786327eb98SAndrei Emeltchenko return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_WINDOW; 29796327eb98SAndrei Emeltchenko } 29806327eb98SAndrei Emeltchenko 2981f89cef09SAndrei Emeltchenko static inline bool __l2cap_efs_supported(struct l2cap_chan *chan) 2982f89cef09SAndrei Emeltchenko { 2983f89cef09SAndrei Emeltchenko return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_FLOW; 2984f89cef09SAndrei Emeltchenko } 2985f89cef09SAndrei Emeltchenko 298636c86c85SMat Martineau static void __l2cap_set_ertm_timeouts(struct l2cap_chan *chan, 298736c86c85SMat Martineau struct l2cap_conf_rfc *rfc) 298836c86c85SMat Martineau { 298936c86c85SMat Martineau if (chan->local_amp_id && chan->hs_hcon) { 299036c86c85SMat Martineau u64 ertm_to = chan->hs_hcon->hdev->amp_be_flush_to; 299136c86c85SMat Martineau 299236c86c85SMat Martineau /* Class 1 devices have must have ERTM timeouts 299336c86c85SMat Martineau * exceeding the Link Supervision Timeout. The 299436c86c85SMat Martineau * default Link Supervision Timeout for AMP 299536c86c85SMat Martineau * controllers is 10 seconds. 299636c86c85SMat Martineau * 299736c86c85SMat Martineau * Class 1 devices use 0xffffffff for their 299836c86c85SMat Martineau * best-effort flush timeout, so the clamping logic 299936c86c85SMat Martineau * will result in a timeout that meets the above 300036c86c85SMat Martineau * requirement. ERTM timeouts are 16-bit values, so 300136c86c85SMat Martineau * the maximum timeout is 65.535 seconds. 300236c86c85SMat Martineau */ 300336c86c85SMat Martineau 300436c86c85SMat Martineau /* Convert timeout to milliseconds and round */ 300536c86c85SMat Martineau ertm_to = DIV_ROUND_UP_ULL(ertm_to, 1000); 300636c86c85SMat Martineau 300736c86c85SMat Martineau /* This is the recommended formula for class 2 devices 300836c86c85SMat Martineau * that start ERTM timers when packets are sent to the 300936c86c85SMat Martineau * controller. 301036c86c85SMat Martineau */ 301136c86c85SMat Martineau ertm_to = 3 * ertm_to + 500; 301236c86c85SMat Martineau 301336c86c85SMat Martineau if (ertm_to > 0xffff) 301436c86c85SMat Martineau ertm_to = 0xffff; 301536c86c85SMat Martineau 301636c86c85SMat Martineau rfc->retrans_timeout = cpu_to_le16((u16) ertm_to); 301736c86c85SMat Martineau rfc->monitor_timeout = rfc->retrans_timeout; 301836c86c85SMat Martineau } else { 301936c86c85SMat Martineau rfc->retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO); 302036c86c85SMat Martineau rfc->monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO); 302136c86c85SMat Martineau } 302236c86c85SMat Martineau } 302336c86c85SMat Martineau 30246327eb98SAndrei Emeltchenko static inline void l2cap_txwin_setup(struct l2cap_chan *chan) 30256327eb98SAndrei Emeltchenko { 30266327eb98SAndrei Emeltchenko if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW && 3027836be934SAndrei Emeltchenko __l2cap_ews_supported(chan)) { 30286327eb98SAndrei Emeltchenko /* use extended control field */ 30296327eb98SAndrei Emeltchenko set_bit(FLAG_EXT_CTRL, &chan->flags); 3030836be934SAndrei Emeltchenko chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; 3031836be934SAndrei Emeltchenko } else { 30326327eb98SAndrei Emeltchenko chan->tx_win = min_t(u16, chan->tx_win, 30336327eb98SAndrei Emeltchenko L2CAP_DEFAULT_TX_WINDOW); 3034836be934SAndrei Emeltchenko chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; 3035836be934SAndrei Emeltchenko } 3036c20f8e35SMat Martineau chan->ack_win = chan->tx_win; 30376327eb98SAndrei Emeltchenko } 30386327eb98SAndrei Emeltchenko 3039710f9b0aSGustavo F. Padovan static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data) 30400a708f8fSGustavo F. Padovan { 30410a708f8fSGustavo F. Padovan struct l2cap_conf_req *req = data; 30420c1bc5c6SGustavo F. Padovan struct l2cap_conf_rfc rfc = { .mode = chan->mode }; 30430a708f8fSGustavo F. Padovan void *ptr = req->data; 3044c8f79162SAndrei Emeltchenko u16 size; 30450a708f8fSGustavo F. Padovan 304649208c9cSGustavo F. Padovan BT_DBG("chan %p", chan); 30470a708f8fSGustavo F. Padovan 304873ffa904SGustavo F. Padovan if (chan->num_conf_req || chan->num_conf_rsp) 30490a708f8fSGustavo F. Padovan goto done; 30500a708f8fSGustavo F. Padovan 30510c1bc5c6SGustavo F. Padovan switch (chan->mode) { 30520a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 30530a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 3054c1360a1cSGustavo F. Padovan if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) 30550a708f8fSGustavo F. Padovan break; 30560a708f8fSGustavo F. Padovan 3057f89cef09SAndrei Emeltchenko if (__l2cap_efs_supported(chan)) 3058f89cef09SAndrei Emeltchenko set_bit(FLAG_EFS_ENABLE, &chan->flags); 3059f89cef09SAndrei Emeltchenko 30600a708f8fSGustavo F. Padovan /* fall through */ 30610a708f8fSGustavo F. Padovan default: 30628c1d787bSGustavo F. Padovan chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask); 30630a708f8fSGustavo F. Padovan break; 30640a708f8fSGustavo F. Padovan } 30650a708f8fSGustavo F. Padovan 30660a708f8fSGustavo F. Padovan done: 30670c1bc5c6SGustavo F. Padovan if (chan->imtu != L2CAP_DEFAULT_MTU) 30680c1bc5c6SGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); 30690a708f8fSGustavo F. Padovan 30700c1bc5c6SGustavo F. Padovan switch (chan->mode) { 30710a708f8fSGustavo F. Padovan case L2CAP_MODE_BASIC: 30728c1d787bSGustavo F. Padovan if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) && 30738c1d787bSGustavo F. Padovan !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING)) 30740a708f8fSGustavo F. Padovan break; 30750a708f8fSGustavo F. Padovan 30760a708f8fSGustavo F. Padovan rfc.mode = L2CAP_MODE_BASIC; 30770a708f8fSGustavo F. Padovan rfc.txwin_size = 0; 30780a708f8fSGustavo F. Padovan rfc.max_transmit = 0; 30790a708f8fSGustavo F. Padovan rfc.retrans_timeout = 0; 30800a708f8fSGustavo F. Padovan rfc.monitor_timeout = 0; 30810a708f8fSGustavo F. Padovan rfc.max_pdu_size = 0; 30820a708f8fSGustavo F. Padovan 30830a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), 30840a708f8fSGustavo F. Padovan (unsigned long) &rfc); 30850a708f8fSGustavo F. Padovan break; 30860a708f8fSGustavo F. Padovan 30870a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 30880a708f8fSGustavo F. Padovan rfc.mode = L2CAP_MODE_ERTM; 308947d1ec61SGustavo F. Padovan rfc.max_transmit = chan->max_tx; 309036c86c85SMat Martineau 309136c86c85SMat Martineau __l2cap_set_ertm_timeouts(chan, &rfc); 3092c8f79162SAndrei Emeltchenko 3093c8f79162SAndrei Emeltchenko size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - 30942d792818SGustavo Padovan L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE - 3095c8f79162SAndrei Emeltchenko L2CAP_FCS_SIZE); 3096c8f79162SAndrei Emeltchenko rfc.max_pdu_size = cpu_to_le16(size); 30970a708f8fSGustavo F. Padovan 30986327eb98SAndrei Emeltchenko l2cap_txwin_setup(chan); 30996327eb98SAndrei Emeltchenko 31006327eb98SAndrei Emeltchenko rfc.txwin_size = min_t(u16, chan->tx_win, 31016327eb98SAndrei Emeltchenko L2CAP_DEFAULT_TX_WINDOW); 31020a708f8fSGustavo F. Padovan 31030a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), 31040a708f8fSGustavo F. Padovan (unsigned long) &rfc); 31050a708f8fSGustavo F. Padovan 3106f89cef09SAndrei Emeltchenko if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) 3107f89cef09SAndrei Emeltchenko l2cap_add_opt_efs(&ptr, chan); 3108f89cef09SAndrei Emeltchenko 31096327eb98SAndrei Emeltchenko if (test_bit(FLAG_EXT_CTRL, &chan->flags)) 31106327eb98SAndrei Emeltchenko l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, 31116327eb98SAndrei Emeltchenko chan->tx_win); 311260918918SAndrei Emeltchenko 311360918918SAndrei Emeltchenko if (chan->conn->feat_mask & L2CAP_FEAT_FCS) 311460918918SAndrei Emeltchenko if (chan->fcs == L2CAP_FCS_NONE || 311560918918SAndrei Emeltchenko test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { 311660918918SAndrei Emeltchenko chan->fcs = L2CAP_FCS_NONE; 311760918918SAndrei Emeltchenko l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, 311860918918SAndrei Emeltchenko chan->fcs); 311960918918SAndrei Emeltchenko } 31200a708f8fSGustavo F. Padovan break; 31210a708f8fSGustavo F. Padovan 31220a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 3123273759e2SMat Martineau l2cap_txwin_setup(chan); 31240a708f8fSGustavo F. Padovan rfc.mode = L2CAP_MODE_STREAMING; 31250a708f8fSGustavo F. Padovan rfc.txwin_size = 0; 31260a708f8fSGustavo F. Padovan rfc.max_transmit = 0; 31270a708f8fSGustavo F. Padovan rfc.retrans_timeout = 0; 31280a708f8fSGustavo F. Padovan rfc.monitor_timeout = 0; 3129c8f79162SAndrei Emeltchenko 3130c8f79162SAndrei Emeltchenko size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - 31312d792818SGustavo Padovan L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE - 3132c8f79162SAndrei Emeltchenko L2CAP_FCS_SIZE); 3133c8f79162SAndrei Emeltchenko rfc.max_pdu_size = cpu_to_le16(size); 31340a708f8fSGustavo F. Padovan 31350a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), 31360a708f8fSGustavo F. Padovan (unsigned long) &rfc); 31370a708f8fSGustavo F. Padovan 3138f89cef09SAndrei Emeltchenko if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) 3139f89cef09SAndrei Emeltchenko l2cap_add_opt_efs(&ptr, chan); 3140f89cef09SAndrei Emeltchenko 314160918918SAndrei Emeltchenko if (chan->conn->feat_mask & L2CAP_FEAT_FCS) 314247d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_NONE || 3143c1360a1cSGustavo F. Padovan test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { 314447d1ec61SGustavo F. Padovan chan->fcs = L2CAP_FCS_NONE; 314560918918SAndrei Emeltchenko l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, 314660918918SAndrei Emeltchenko chan->fcs); 31470a708f8fSGustavo F. Padovan } 31480a708f8fSGustavo F. Padovan break; 31490a708f8fSGustavo F. Padovan } 31500a708f8fSGustavo F. Padovan 3151fe4128e0SGustavo F. Padovan req->dcid = cpu_to_le16(chan->dcid); 315259e54bd1SAndrei Emeltchenko req->flags = __constant_cpu_to_le16(0); 31530a708f8fSGustavo F. Padovan 31540a708f8fSGustavo F. Padovan return ptr - data; 31550a708f8fSGustavo F. Padovan } 31560a708f8fSGustavo F. Padovan 315773ffa904SGustavo F. Padovan static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data) 31580a708f8fSGustavo F. Padovan { 31590a708f8fSGustavo F. Padovan struct l2cap_conf_rsp *rsp = data; 31600a708f8fSGustavo F. Padovan void *ptr = rsp->data; 316173ffa904SGustavo F. Padovan void *req = chan->conf_req; 316273ffa904SGustavo F. Padovan int len = chan->conf_len; 31630a708f8fSGustavo F. Padovan int type, hint, olen; 31640a708f8fSGustavo F. Padovan unsigned long val; 31650a708f8fSGustavo F. Padovan struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; 316642dceae2SAndrei Emeltchenko struct l2cap_conf_efs efs; 316742dceae2SAndrei Emeltchenko u8 remote_efs = 0; 31680a708f8fSGustavo F. Padovan u16 mtu = L2CAP_DEFAULT_MTU; 31690a708f8fSGustavo F. Padovan u16 result = L2CAP_CONF_SUCCESS; 3170c8f79162SAndrei Emeltchenko u16 size; 31710a708f8fSGustavo F. Padovan 317273ffa904SGustavo F. Padovan BT_DBG("chan %p", chan); 31730a708f8fSGustavo F. Padovan 31740a708f8fSGustavo F. Padovan while (len >= L2CAP_CONF_OPT_SIZE) { 31750a708f8fSGustavo F. Padovan len -= l2cap_get_conf_opt(&req, &type, &olen, &val); 31760a708f8fSGustavo F. Padovan 31770a708f8fSGustavo F. Padovan hint = type & L2CAP_CONF_HINT; 31780a708f8fSGustavo F. Padovan type &= L2CAP_CONF_MASK; 31790a708f8fSGustavo F. Padovan 31800a708f8fSGustavo F. Padovan switch (type) { 31810a708f8fSGustavo F. Padovan case L2CAP_CONF_MTU: 31820a708f8fSGustavo F. Padovan mtu = val; 31830a708f8fSGustavo F. Padovan break; 31840a708f8fSGustavo F. Padovan 31850a708f8fSGustavo F. Padovan case L2CAP_CONF_FLUSH_TO: 31860c1bc5c6SGustavo F. Padovan chan->flush_to = val; 31870a708f8fSGustavo F. Padovan break; 31880a708f8fSGustavo F. Padovan 31890a708f8fSGustavo F. Padovan case L2CAP_CONF_QOS: 31900a708f8fSGustavo F. Padovan break; 31910a708f8fSGustavo F. Padovan 31920a708f8fSGustavo F. Padovan case L2CAP_CONF_RFC: 31930a708f8fSGustavo F. Padovan if (olen == sizeof(rfc)) 31940a708f8fSGustavo F. Padovan memcpy(&rfc, (void *) val, olen); 31950a708f8fSGustavo F. Padovan break; 31960a708f8fSGustavo F. Padovan 31970a708f8fSGustavo F. Padovan case L2CAP_CONF_FCS: 31980a708f8fSGustavo F. Padovan if (val == L2CAP_FCS_NONE) 3199c1360a1cSGustavo F. Padovan set_bit(CONF_NO_FCS_RECV, &chan->conf_state); 320042dceae2SAndrei Emeltchenko break; 32010a708f8fSGustavo F. Padovan 320242dceae2SAndrei Emeltchenko case L2CAP_CONF_EFS: 320342dceae2SAndrei Emeltchenko remote_efs = 1; 320442dceae2SAndrei Emeltchenko if (olen == sizeof(efs)) 320542dceae2SAndrei Emeltchenko memcpy(&efs, (void *) val, olen); 32060a708f8fSGustavo F. Padovan break; 32070a708f8fSGustavo F. Padovan 32086327eb98SAndrei Emeltchenko case L2CAP_CONF_EWS: 32096327eb98SAndrei Emeltchenko if (!enable_hs) 32106327eb98SAndrei Emeltchenko return -ECONNREFUSED; 32116327eb98SAndrei Emeltchenko 32126327eb98SAndrei Emeltchenko set_bit(FLAG_EXT_CTRL, &chan->flags); 32136327eb98SAndrei Emeltchenko set_bit(CONF_EWS_RECV, &chan->conf_state); 3214836be934SAndrei Emeltchenko chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; 32156327eb98SAndrei Emeltchenko chan->remote_tx_win = val; 32160a708f8fSGustavo F. Padovan break; 32170a708f8fSGustavo F. Padovan 32180a708f8fSGustavo F. Padovan default: 32190a708f8fSGustavo F. Padovan if (hint) 32200a708f8fSGustavo F. Padovan break; 32210a708f8fSGustavo F. Padovan 32220a708f8fSGustavo F. Padovan result = L2CAP_CONF_UNKNOWN; 32230a708f8fSGustavo F. Padovan *((u8 *) ptr++) = type; 32240a708f8fSGustavo F. Padovan break; 32250a708f8fSGustavo F. Padovan } 32260a708f8fSGustavo F. Padovan } 32270a708f8fSGustavo F. Padovan 322873ffa904SGustavo F. Padovan if (chan->num_conf_rsp || chan->num_conf_req > 1) 32290a708f8fSGustavo F. Padovan goto done; 32300a708f8fSGustavo F. Padovan 32310c1bc5c6SGustavo F. Padovan switch (chan->mode) { 32320a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 32330a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 3234c1360a1cSGustavo F. Padovan if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) { 32350c1bc5c6SGustavo F. Padovan chan->mode = l2cap_select_mode(rfc.mode, 32368c1d787bSGustavo F. Padovan chan->conn->feat_mask); 32370a708f8fSGustavo F. Padovan break; 32380a708f8fSGustavo F. Padovan } 32390a708f8fSGustavo F. Padovan 324042dceae2SAndrei Emeltchenko if (remote_efs) { 324142dceae2SAndrei Emeltchenko if (__l2cap_efs_supported(chan)) 324242dceae2SAndrei Emeltchenko set_bit(FLAG_EFS_ENABLE, &chan->flags); 324342dceae2SAndrei Emeltchenko else 324442dceae2SAndrei Emeltchenko return -ECONNREFUSED; 324542dceae2SAndrei Emeltchenko } 324642dceae2SAndrei Emeltchenko 32470c1bc5c6SGustavo F. Padovan if (chan->mode != rfc.mode) 32480a708f8fSGustavo F. Padovan return -ECONNREFUSED; 32490a708f8fSGustavo F. Padovan 32500a708f8fSGustavo F. Padovan break; 32510a708f8fSGustavo F. Padovan } 32520a708f8fSGustavo F. Padovan 32530a708f8fSGustavo F. Padovan done: 32540c1bc5c6SGustavo F. Padovan if (chan->mode != rfc.mode) { 32550a708f8fSGustavo F. Padovan result = L2CAP_CONF_UNACCEPT; 32560c1bc5c6SGustavo F. Padovan rfc.mode = chan->mode; 32570a708f8fSGustavo F. Padovan 325873ffa904SGustavo F. Padovan if (chan->num_conf_rsp == 1) 32590a708f8fSGustavo F. Padovan return -ECONNREFUSED; 32600a708f8fSGustavo F. Padovan 32612d792818SGustavo Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), 32622d792818SGustavo Padovan (unsigned long) &rfc); 32630a708f8fSGustavo F. Padovan } 32640a708f8fSGustavo F. Padovan 32650a708f8fSGustavo F. Padovan if (result == L2CAP_CONF_SUCCESS) { 32660a708f8fSGustavo F. Padovan /* Configure output options and let the other side know 32670a708f8fSGustavo F. Padovan * which ones we don't like. */ 32680a708f8fSGustavo F. Padovan 32690a708f8fSGustavo F. Padovan if (mtu < L2CAP_DEFAULT_MIN_MTU) 32700a708f8fSGustavo F. Padovan result = L2CAP_CONF_UNACCEPT; 32710a708f8fSGustavo F. Padovan else { 32720c1bc5c6SGustavo F. Padovan chan->omtu = mtu; 3273c1360a1cSGustavo F. Padovan set_bit(CONF_MTU_DONE, &chan->conf_state); 32740a708f8fSGustavo F. Padovan } 32750c1bc5c6SGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu); 32760a708f8fSGustavo F. Padovan 327742dceae2SAndrei Emeltchenko if (remote_efs) { 327842dceae2SAndrei Emeltchenko if (chan->local_stype != L2CAP_SERV_NOTRAFIC && 327942dceae2SAndrei Emeltchenko efs.stype != L2CAP_SERV_NOTRAFIC && 328042dceae2SAndrei Emeltchenko efs.stype != chan->local_stype) { 328142dceae2SAndrei Emeltchenko 328242dceae2SAndrei Emeltchenko result = L2CAP_CONF_UNACCEPT; 328342dceae2SAndrei Emeltchenko 328442dceae2SAndrei Emeltchenko if (chan->num_conf_req >= 1) 328542dceae2SAndrei Emeltchenko return -ECONNREFUSED; 328642dceae2SAndrei Emeltchenko 328742dceae2SAndrei Emeltchenko l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, 328842dceae2SAndrei Emeltchenko sizeof(efs), 328942dceae2SAndrei Emeltchenko (unsigned long) &efs); 32900e8b207eSAndrei Emeltchenko } else { 32913e6b3b95SGustavo F. Padovan /* Send PENDING Conf Rsp */ 32920e8b207eSAndrei Emeltchenko result = L2CAP_CONF_PENDING; 32930e8b207eSAndrei Emeltchenko set_bit(CONF_LOC_CONF_PEND, &chan->conf_state); 329442dceae2SAndrei Emeltchenko } 329542dceae2SAndrei Emeltchenko } 329642dceae2SAndrei Emeltchenko 32970a708f8fSGustavo F. Padovan switch (rfc.mode) { 32980a708f8fSGustavo F. Padovan case L2CAP_MODE_BASIC: 329947d1ec61SGustavo F. Padovan chan->fcs = L2CAP_FCS_NONE; 3300c1360a1cSGustavo F. Padovan set_bit(CONF_MODE_DONE, &chan->conf_state); 33010a708f8fSGustavo F. Padovan break; 33020a708f8fSGustavo F. Padovan 33030a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 33046327eb98SAndrei Emeltchenko if (!test_bit(CONF_EWS_RECV, &chan->conf_state)) 33052c03a7a4SGustavo F. Padovan chan->remote_tx_win = rfc.txwin_size; 33066327eb98SAndrei Emeltchenko else 33076327eb98SAndrei Emeltchenko rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW; 33086327eb98SAndrei Emeltchenko 33092c03a7a4SGustavo F. Padovan chan->remote_max_tx = rfc.max_transmit; 33100a708f8fSGustavo F. Padovan 3311c8f79162SAndrei Emeltchenko size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), 33122d792818SGustavo Padovan chan->conn->mtu - L2CAP_EXT_HDR_SIZE - 33132d792818SGustavo Padovan L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE); 3314c8f79162SAndrei Emeltchenko rfc.max_pdu_size = cpu_to_le16(size); 3315c8f79162SAndrei Emeltchenko chan->remote_mps = size; 33160a708f8fSGustavo F. Padovan 331736c86c85SMat Martineau __l2cap_set_ertm_timeouts(chan, &rfc); 33180a708f8fSGustavo F. Padovan 3319c1360a1cSGustavo F. Padovan set_bit(CONF_MODE_DONE, &chan->conf_state); 33200a708f8fSGustavo F. Padovan 33210a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, 33220a708f8fSGustavo F. Padovan sizeof(rfc), (unsigned long) &rfc); 33230a708f8fSGustavo F. Padovan 332442dceae2SAndrei Emeltchenko if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { 332542dceae2SAndrei Emeltchenko chan->remote_id = efs.id; 332642dceae2SAndrei Emeltchenko chan->remote_stype = efs.stype; 332742dceae2SAndrei Emeltchenko chan->remote_msdu = le16_to_cpu(efs.msdu); 332842dceae2SAndrei Emeltchenko chan->remote_flush_to = 332942dceae2SAndrei Emeltchenko le32_to_cpu(efs.flush_to); 333042dceae2SAndrei Emeltchenko chan->remote_acc_lat = 333142dceae2SAndrei Emeltchenko le32_to_cpu(efs.acc_lat); 333242dceae2SAndrei Emeltchenko chan->remote_sdu_itime = 333342dceae2SAndrei Emeltchenko le32_to_cpu(efs.sdu_itime); 333442dceae2SAndrei Emeltchenko l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, 33352d792818SGustavo Padovan sizeof(efs), 33362d792818SGustavo Padovan (unsigned long) &efs); 333742dceae2SAndrei Emeltchenko } 33380a708f8fSGustavo F. Padovan break; 33390a708f8fSGustavo F. Padovan 33400a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 3341c8f79162SAndrei Emeltchenko size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), 33422d792818SGustavo Padovan chan->conn->mtu - L2CAP_EXT_HDR_SIZE - 33432d792818SGustavo Padovan L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE); 3344c8f79162SAndrei Emeltchenko rfc.max_pdu_size = cpu_to_le16(size); 3345c8f79162SAndrei Emeltchenko chan->remote_mps = size; 33460a708f8fSGustavo F. Padovan 3347c1360a1cSGustavo F. Padovan set_bit(CONF_MODE_DONE, &chan->conf_state); 33480a708f8fSGustavo F. Padovan 33492d792818SGustavo Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), 33502d792818SGustavo Padovan (unsigned long) &rfc); 33510a708f8fSGustavo F. Padovan 33520a708f8fSGustavo F. Padovan break; 33530a708f8fSGustavo F. Padovan 33540a708f8fSGustavo F. Padovan default: 33550a708f8fSGustavo F. Padovan result = L2CAP_CONF_UNACCEPT; 33560a708f8fSGustavo F. Padovan 33570a708f8fSGustavo F. Padovan memset(&rfc, 0, sizeof(rfc)); 33580c1bc5c6SGustavo F. Padovan rfc.mode = chan->mode; 33590a708f8fSGustavo F. Padovan } 33600a708f8fSGustavo F. Padovan 33610a708f8fSGustavo F. Padovan if (result == L2CAP_CONF_SUCCESS) 3362c1360a1cSGustavo F. Padovan set_bit(CONF_OUTPUT_DONE, &chan->conf_state); 33630a708f8fSGustavo F. Padovan } 3364fe4128e0SGustavo F. Padovan rsp->scid = cpu_to_le16(chan->dcid); 33650a708f8fSGustavo F. Padovan rsp->result = cpu_to_le16(result); 336659e54bd1SAndrei Emeltchenko rsp->flags = __constant_cpu_to_le16(0); 33670a708f8fSGustavo F. Padovan 33680a708f8fSGustavo F. Padovan return ptr - data; 33690a708f8fSGustavo F. Padovan } 33700a708f8fSGustavo F. Padovan 33712d792818SGustavo Padovan static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, 33722d792818SGustavo Padovan void *data, u16 *result) 33730a708f8fSGustavo F. Padovan { 33740a708f8fSGustavo F. Padovan struct l2cap_conf_req *req = data; 33750a708f8fSGustavo F. Padovan void *ptr = req->data; 33760a708f8fSGustavo F. Padovan int type, olen; 33770a708f8fSGustavo F. Padovan unsigned long val; 337836e999a8SMat Martineau struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; 337966af7aafSAndrei Emeltchenko struct l2cap_conf_efs efs; 33800a708f8fSGustavo F. Padovan 3381fe4128e0SGustavo F. Padovan BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data); 33820a708f8fSGustavo F. Padovan 33830a708f8fSGustavo F. Padovan while (len >= L2CAP_CONF_OPT_SIZE) { 33840a708f8fSGustavo F. Padovan len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); 33850a708f8fSGustavo F. Padovan 33860a708f8fSGustavo F. Padovan switch (type) { 33870a708f8fSGustavo F. Padovan case L2CAP_CONF_MTU: 33880a708f8fSGustavo F. Padovan if (val < L2CAP_DEFAULT_MIN_MTU) { 33890a708f8fSGustavo F. Padovan *result = L2CAP_CONF_UNACCEPT; 33900c1bc5c6SGustavo F. Padovan chan->imtu = L2CAP_DEFAULT_MIN_MTU; 33910a708f8fSGustavo F. Padovan } else 33920c1bc5c6SGustavo F. Padovan chan->imtu = val; 33930c1bc5c6SGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); 33940a708f8fSGustavo F. Padovan break; 33950a708f8fSGustavo F. Padovan 33960a708f8fSGustavo F. Padovan case L2CAP_CONF_FLUSH_TO: 33970c1bc5c6SGustavo F. Padovan chan->flush_to = val; 33980a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, 33990c1bc5c6SGustavo F. Padovan 2, chan->flush_to); 34000a708f8fSGustavo F. Padovan break; 34010a708f8fSGustavo F. Padovan 34020a708f8fSGustavo F. Padovan case L2CAP_CONF_RFC: 34030a708f8fSGustavo F. Padovan if (olen == sizeof(rfc)) 34040a708f8fSGustavo F. Padovan memcpy(&rfc, (void *)val, olen); 34050a708f8fSGustavo F. Padovan 3406c1360a1cSGustavo F. Padovan if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) && 34070c1bc5c6SGustavo F. Padovan rfc.mode != chan->mode) 34080a708f8fSGustavo F. Padovan return -ECONNREFUSED; 34090a708f8fSGustavo F. Padovan 341047d1ec61SGustavo F. Padovan chan->fcs = 0; 34110a708f8fSGustavo F. Padovan 34120a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, 34130a708f8fSGustavo F. Padovan sizeof(rfc), (unsigned long) &rfc); 34140a708f8fSGustavo F. Padovan break; 34156327eb98SAndrei Emeltchenko 34166327eb98SAndrei Emeltchenko case L2CAP_CONF_EWS: 3417c20f8e35SMat Martineau chan->ack_win = min_t(u16, val, chan->ack_win); 34183e6b3b95SGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, 34193e6b3b95SGustavo F. Padovan chan->tx_win); 34206327eb98SAndrei Emeltchenko break; 342166af7aafSAndrei Emeltchenko 342266af7aafSAndrei Emeltchenko case L2CAP_CONF_EFS: 342366af7aafSAndrei Emeltchenko if (olen == sizeof(efs)) 342466af7aafSAndrei Emeltchenko memcpy(&efs, (void *)val, olen); 342566af7aafSAndrei Emeltchenko 342666af7aafSAndrei Emeltchenko if (chan->local_stype != L2CAP_SERV_NOTRAFIC && 342766af7aafSAndrei Emeltchenko efs.stype != L2CAP_SERV_NOTRAFIC && 342866af7aafSAndrei Emeltchenko efs.stype != chan->local_stype) 342966af7aafSAndrei Emeltchenko return -ECONNREFUSED; 343066af7aafSAndrei Emeltchenko 34312d792818SGustavo Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, sizeof(efs), 34322d792818SGustavo Padovan (unsigned long) &efs); 343366af7aafSAndrei Emeltchenko break; 34340a708f8fSGustavo F. Padovan } 34350a708f8fSGustavo F. Padovan } 34360a708f8fSGustavo F. Padovan 34370c1bc5c6SGustavo F. Padovan if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode) 34380a708f8fSGustavo F. Padovan return -ECONNREFUSED; 34390a708f8fSGustavo F. Padovan 34400c1bc5c6SGustavo F. Padovan chan->mode = rfc.mode; 34410a708f8fSGustavo F. Padovan 34420e8b207eSAndrei Emeltchenko if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) { 34430a708f8fSGustavo F. Padovan switch (rfc.mode) { 34440a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 344547d1ec61SGustavo F. Padovan chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); 344647d1ec61SGustavo F. Padovan chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); 344747d1ec61SGustavo F. Padovan chan->mps = le16_to_cpu(rfc.max_pdu_size); 3448c20f8e35SMat Martineau if (!test_bit(FLAG_EXT_CTRL, &chan->flags)) 3449c20f8e35SMat Martineau chan->ack_win = min_t(u16, chan->ack_win, 3450c20f8e35SMat Martineau rfc.txwin_size); 345166af7aafSAndrei Emeltchenko 345266af7aafSAndrei Emeltchenko if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { 345366af7aafSAndrei Emeltchenko chan->local_msdu = le16_to_cpu(efs.msdu); 345466af7aafSAndrei Emeltchenko chan->local_sdu_itime = 345566af7aafSAndrei Emeltchenko le32_to_cpu(efs.sdu_itime); 345666af7aafSAndrei Emeltchenko chan->local_acc_lat = le32_to_cpu(efs.acc_lat); 345766af7aafSAndrei Emeltchenko chan->local_flush_to = 345866af7aafSAndrei Emeltchenko le32_to_cpu(efs.flush_to); 345966af7aafSAndrei Emeltchenko } 34600a708f8fSGustavo F. Padovan break; 346166af7aafSAndrei Emeltchenko 34620a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 346347d1ec61SGustavo F. Padovan chan->mps = le16_to_cpu(rfc.max_pdu_size); 34640a708f8fSGustavo F. Padovan } 34650a708f8fSGustavo F. Padovan } 34660a708f8fSGustavo F. Padovan 3467fe4128e0SGustavo F. Padovan req->dcid = cpu_to_le16(chan->dcid); 346859e54bd1SAndrei Emeltchenko req->flags = __constant_cpu_to_le16(0); 34690a708f8fSGustavo F. Padovan 34700a708f8fSGustavo F. Padovan return ptr - data; 34710a708f8fSGustavo F. Padovan } 34720a708f8fSGustavo F. Padovan 34732d792818SGustavo Padovan static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, 34742d792818SGustavo Padovan u16 result, u16 flags) 34750a708f8fSGustavo F. Padovan { 34760a708f8fSGustavo F. Padovan struct l2cap_conf_rsp *rsp = data; 34770a708f8fSGustavo F. Padovan void *ptr = rsp->data; 34780a708f8fSGustavo F. Padovan 3479fe4128e0SGustavo F. Padovan BT_DBG("chan %p", chan); 34800a708f8fSGustavo F. Padovan 3481fe4128e0SGustavo F. Padovan rsp->scid = cpu_to_le16(chan->dcid); 34820a708f8fSGustavo F. Padovan rsp->result = cpu_to_le16(result); 34830a708f8fSGustavo F. Padovan rsp->flags = cpu_to_le16(flags); 34840a708f8fSGustavo F. Padovan 34850a708f8fSGustavo F. Padovan return ptr - data; 34860a708f8fSGustavo F. Padovan } 34870a708f8fSGustavo F. Padovan 34888c1d787bSGustavo F. Padovan void __l2cap_connect_rsp_defer(struct l2cap_chan *chan) 3489710f9b0aSGustavo F. Padovan { 3490710f9b0aSGustavo F. Padovan struct l2cap_conn_rsp rsp; 34918c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 3492710f9b0aSGustavo F. Padovan u8 buf[128]; 3493439f34acSAndrei Emeltchenko u8 rsp_code; 3494710f9b0aSGustavo F. Padovan 3495fe4128e0SGustavo F. Padovan rsp.scid = cpu_to_le16(chan->dcid); 3496fe4128e0SGustavo F. Padovan rsp.dcid = cpu_to_le16(chan->scid); 3497ac73498cSAndrei Emeltchenko rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS); 3498ac73498cSAndrei Emeltchenko rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); 3499439f34acSAndrei Emeltchenko 3500439f34acSAndrei Emeltchenko if (chan->hs_hcon) 3501439f34acSAndrei Emeltchenko rsp_code = L2CAP_CREATE_CHAN_RSP; 3502439f34acSAndrei Emeltchenko else 3503439f34acSAndrei Emeltchenko rsp_code = L2CAP_CONN_RSP; 3504439f34acSAndrei Emeltchenko 3505439f34acSAndrei Emeltchenko BT_DBG("chan %p rsp_code %u", chan, rsp_code); 3506439f34acSAndrei Emeltchenko 3507439f34acSAndrei Emeltchenko l2cap_send_cmd(conn, chan->ident, rsp_code, sizeof(rsp), &rsp); 3508710f9b0aSGustavo F. Padovan 3509c1360a1cSGustavo F. Padovan if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) 3510710f9b0aSGustavo F. Padovan return; 3511710f9b0aSGustavo F. Padovan 3512710f9b0aSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 3513710f9b0aSGustavo F. Padovan l2cap_build_conf_req(chan, buf), buf); 3514710f9b0aSGustavo F. Padovan chan->num_conf_req++; 3515710f9b0aSGustavo F. Padovan } 3516710f9b0aSGustavo F. Padovan 351747d1ec61SGustavo F. Padovan static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len) 35180a708f8fSGustavo F. Padovan { 35190a708f8fSGustavo F. Padovan int type, olen; 35200a708f8fSGustavo F. Padovan unsigned long val; 3521c20f8e35SMat Martineau /* Use sane default values in case a misbehaving remote device 3522c20f8e35SMat Martineau * did not send an RFC or extended window size option. 3523c20f8e35SMat Martineau */ 3524c20f8e35SMat Martineau u16 txwin_ext = chan->ack_win; 3525c20f8e35SMat Martineau struct l2cap_conf_rfc rfc = { 3526c20f8e35SMat Martineau .mode = chan->mode, 3527c20f8e35SMat Martineau .retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO), 3528c20f8e35SMat Martineau .monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO), 3529c20f8e35SMat Martineau .max_pdu_size = cpu_to_le16(chan->imtu), 3530c20f8e35SMat Martineau .txwin_size = min_t(u16, chan->ack_win, L2CAP_DEFAULT_TX_WINDOW), 3531c20f8e35SMat Martineau }; 35320a708f8fSGustavo F. Padovan 353347d1ec61SGustavo F. Padovan BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len); 35340a708f8fSGustavo F. Padovan 35350c1bc5c6SGustavo F. Padovan if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING)) 35360a708f8fSGustavo F. Padovan return; 35370a708f8fSGustavo F. Padovan 35380a708f8fSGustavo F. Padovan while (len >= L2CAP_CONF_OPT_SIZE) { 35390a708f8fSGustavo F. Padovan len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); 35400a708f8fSGustavo F. Padovan 3541c20f8e35SMat Martineau switch (type) { 3542c20f8e35SMat Martineau case L2CAP_CONF_RFC: 3543c20f8e35SMat Martineau if (olen == sizeof(rfc)) 35440a708f8fSGustavo F. Padovan memcpy(&rfc, (void *)val, olen); 3545c20f8e35SMat Martineau break; 3546c20f8e35SMat Martineau case L2CAP_CONF_EWS: 3547c20f8e35SMat Martineau txwin_ext = val; 3548c20f8e35SMat Martineau break; 3549c20f8e35SMat Martineau } 35500a708f8fSGustavo F. Padovan } 35510a708f8fSGustavo F. Padovan 35520a708f8fSGustavo F. Padovan switch (rfc.mode) { 35530a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 355447d1ec61SGustavo F. Padovan chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); 355547d1ec61SGustavo F. Padovan chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); 355647d1ec61SGustavo F. Padovan chan->mps = le16_to_cpu(rfc.max_pdu_size); 3557c20f8e35SMat Martineau if (test_bit(FLAG_EXT_CTRL, &chan->flags)) 3558c20f8e35SMat Martineau chan->ack_win = min_t(u16, chan->ack_win, txwin_ext); 3559c20f8e35SMat Martineau else 3560c20f8e35SMat Martineau chan->ack_win = min_t(u16, chan->ack_win, 3561c20f8e35SMat Martineau rfc.txwin_size); 35620a708f8fSGustavo F. Padovan break; 35630a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 356447d1ec61SGustavo F. Padovan chan->mps = le16_to_cpu(rfc.max_pdu_size); 35650a708f8fSGustavo F. Padovan } 35660a708f8fSGustavo F. Padovan } 35670a708f8fSGustavo F. Padovan 35682d792818SGustavo Padovan static inline int l2cap_command_rej(struct l2cap_conn *conn, 35692d792818SGustavo Padovan struct l2cap_cmd_hdr *cmd, u8 *data) 35700a708f8fSGustavo F. Padovan { 3571e2fd318eSIlia Kolomisnky struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data; 35720a708f8fSGustavo F. Padovan 3573e2fd318eSIlia Kolomisnky if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD) 35740a708f8fSGustavo F. Padovan return 0; 35750a708f8fSGustavo F. Padovan 35760a708f8fSGustavo F. Padovan if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && 35770a708f8fSGustavo F. Padovan cmd->ident == conn->info_ident) { 357817cd3f37SUlisses Furquim cancel_delayed_work(&conn->info_timer); 35790a708f8fSGustavo F. Padovan 35800a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 35810a708f8fSGustavo F. Padovan conn->info_ident = 0; 35820a708f8fSGustavo F. Padovan 35830a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 35840a708f8fSGustavo F. Padovan } 35850a708f8fSGustavo F. Padovan 35860a708f8fSGustavo F. Padovan return 0; 35870a708f8fSGustavo F. Padovan } 35880a708f8fSGustavo F. Padovan 35891700915fSMat Martineau static struct l2cap_chan *l2cap_connect(struct l2cap_conn *conn, 35901700915fSMat Martineau struct l2cap_cmd_hdr *cmd, 35914c89b6aaSMat Martineau u8 *data, u8 rsp_code, u8 amp_id) 35920a708f8fSGustavo F. Padovan { 35930a708f8fSGustavo F. Padovan struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; 35940a708f8fSGustavo F. Padovan struct l2cap_conn_rsp rsp; 359523691d75SGustavo F. Padovan struct l2cap_chan *chan = NULL, *pchan; 35960a708f8fSGustavo F. Padovan struct sock *parent, *sk = NULL; 35970a708f8fSGustavo F. Padovan int result, status = L2CAP_CS_NO_INFO; 35980a708f8fSGustavo F. Padovan 35990a708f8fSGustavo F. Padovan u16 dcid = 0, scid = __le16_to_cpu(req->scid); 36000a708f8fSGustavo F. Padovan __le16 psm = req->psm; 36010a708f8fSGustavo F. Padovan 3602097db76cSAndrei Emeltchenko BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid); 36030a708f8fSGustavo F. Padovan 36040a708f8fSGustavo F. Padovan /* Check if we have socket listening on psm */ 3605c2287681SIdo Yariv pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src, conn->dst); 360623691d75SGustavo F. Padovan if (!pchan) { 36070a708f8fSGustavo F. Padovan result = L2CAP_CR_BAD_PSM; 36080a708f8fSGustavo F. Padovan goto sendresp; 36090a708f8fSGustavo F. Padovan } 36100a708f8fSGustavo F. Padovan 361123691d75SGustavo F. Padovan parent = pchan->sk; 361223691d75SGustavo F. Padovan 36133df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 3614aa2ac881SGustavo F. Padovan lock_sock(parent); 36150a708f8fSGustavo F. Padovan 36160a708f8fSGustavo F. Padovan /* Check if the ACL is secure enough (if not SDP) */ 36172983fd68SAndrei Emeltchenko if (psm != __constant_cpu_to_le16(L2CAP_PSM_SDP) && 36180a708f8fSGustavo F. Padovan !hci_conn_check_link_mode(conn->hcon)) { 36199f5a0d7bSAndrei Emeltchenko conn->disc_reason = HCI_ERROR_AUTH_FAILURE; 36200a708f8fSGustavo F. Padovan result = L2CAP_CR_SEC_BLOCK; 36210a708f8fSGustavo F. Padovan goto response; 36220a708f8fSGustavo F. Padovan } 36230a708f8fSGustavo F. Padovan 36240a708f8fSGustavo F. Padovan result = L2CAP_CR_NO_MEM; 36250a708f8fSGustavo F. Padovan 36262dfa1003SGustavo Padovan /* Check if we already have channel with that dcid */ 36272dfa1003SGustavo Padovan if (__l2cap_get_chan_by_dcid(conn, scid)) 36282dfa1003SGustavo Padovan goto response; 36292dfa1003SGustavo Padovan 363080b98027SGustavo Padovan chan = pchan->ops->new_connection(pchan); 363180808e43SGustavo F. Padovan if (!chan) 36320a708f8fSGustavo F. Padovan goto response; 36330a708f8fSGustavo F. Padovan 363480808e43SGustavo F. Padovan sk = chan->sk; 363580808e43SGustavo F. Padovan 36360a708f8fSGustavo F. Padovan hci_conn_hold(conn->hcon); 36370a708f8fSGustavo F. Padovan 36380a708f8fSGustavo F. Padovan bacpy(&bt_sk(sk)->src, conn->src); 36390a708f8fSGustavo F. Padovan bacpy(&bt_sk(sk)->dst, conn->dst); 3640fe4128e0SGustavo F. Padovan chan->psm = psm; 3641fe4128e0SGustavo F. Padovan chan->dcid = scid; 36421700915fSMat Martineau chan->local_amp_id = amp_id; 36430a708f8fSGustavo F. Padovan 36446be36555SAndrei Emeltchenko __l2cap_chan_add(conn, chan); 364548454079SGustavo F. Padovan 3646fe4128e0SGustavo F. Padovan dcid = chan->scid; 36470a708f8fSGustavo F. Padovan 3648c9b66675SGustavo F. Padovan __set_chan_timer(chan, sk->sk_sndtimeo); 36490a708f8fSGustavo F. Padovan 3650fc7f8a7eSGustavo F. Padovan chan->ident = cmd->ident; 36510a708f8fSGustavo F. Padovan 36520a708f8fSGustavo F. Padovan if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { 3653d45fc423SGustavo F. Padovan if (l2cap_chan_check_security(chan)) { 3654c5daa683SGustavo Padovan if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) { 36550e587be7SAndrei Emeltchenko __l2cap_state_change(chan, BT_CONNECT2); 36560a708f8fSGustavo F. Padovan result = L2CAP_CR_PEND; 36570a708f8fSGustavo F. Padovan status = L2CAP_CS_AUTHOR_PEND; 36582dc4e510SGustavo Padovan chan->ops->defer(chan); 36590a708f8fSGustavo F. Padovan } else { 36601700915fSMat Martineau /* Force pending result for AMP controllers. 36611700915fSMat Martineau * The connection will succeed after the 36621700915fSMat Martineau * physical link is up. 36631700915fSMat Martineau */ 36641700915fSMat Martineau if (amp_id) { 36651700915fSMat Martineau __l2cap_state_change(chan, BT_CONNECT2); 36661700915fSMat Martineau result = L2CAP_CR_PEND; 36671700915fSMat Martineau } else { 36680e587be7SAndrei Emeltchenko __l2cap_state_change(chan, BT_CONFIG); 36690a708f8fSGustavo F. Padovan result = L2CAP_CR_SUCCESS; 36701700915fSMat Martineau } 36710a708f8fSGustavo F. Padovan status = L2CAP_CS_NO_INFO; 36720a708f8fSGustavo F. Padovan } 36730a708f8fSGustavo F. Padovan } else { 36740e587be7SAndrei Emeltchenko __l2cap_state_change(chan, BT_CONNECT2); 36750a708f8fSGustavo F. Padovan result = L2CAP_CR_PEND; 36760a708f8fSGustavo F. Padovan status = L2CAP_CS_AUTHEN_PEND; 36770a708f8fSGustavo F. Padovan } 36780a708f8fSGustavo F. Padovan } else { 36790e587be7SAndrei Emeltchenko __l2cap_state_change(chan, BT_CONNECT2); 36800a708f8fSGustavo F. Padovan result = L2CAP_CR_PEND; 36810a708f8fSGustavo F. Padovan status = L2CAP_CS_NO_INFO; 36820a708f8fSGustavo F. Padovan } 36830a708f8fSGustavo F. Padovan 36840a708f8fSGustavo F. Padovan response: 3685aa2ac881SGustavo F. Padovan release_sock(parent); 36863df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 36870a708f8fSGustavo F. Padovan 36880a708f8fSGustavo F. Padovan sendresp: 36890a708f8fSGustavo F. Padovan rsp.scid = cpu_to_le16(scid); 36900a708f8fSGustavo F. Padovan rsp.dcid = cpu_to_le16(dcid); 36910a708f8fSGustavo F. Padovan rsp.result = cpu_to_le16(result); 36920a708f8fSGustavo F. Padovan rsp.status = cpu_to_le16(status); 36934c89b6aaSMat Martineau l2cap_send_cmd(conn, cmd->ident, rsp_code, sizeof(rsp), &rsp); 36940a708f8fSGustavo F. Padovan 36950a708f8fSGustavo F. Padovan if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { 36960a708f8fSGustavo F. Padovan struct l2cap_info_req info; 3697ac73498cSAndrei Emeltchenko info.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); 36980a708f8fSGustavo F. Padovan 36990a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; 37000a708f8fSGustavo F. Padovan conn->info_ident = l2cap_get_ident(conn); 37010a708f8fSGustavo F. Padovan 3702ba13ccd9SMarcel Holtmann schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); 37030a708f8fSGustavo F. Padovan 37042d792818SGustavo Padovan l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ, 37052d792818SGustavo Padovan sizeof(info), &info); 37060a708f8fSGustavo F. Padovan } 37070a708f8fSGustavo F. Padovan 3708c1360a1cSGustavo F. Padovan if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) && 37090a708f8fSGustavo F. Padovan result == L2CAP_CR_SUCCESS) { 37100a708f8fSGustavo F. Padovan u8 buf[128]; 3711c1360a1cSGustavo F. Padovan set_bit(CONF_REQ_SENT, &chan->conf_state); 37120a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 371373ffa904SGustavo F. Padovan l2cap_build_conf_req(chan, buf), buf); 371473ffa904SGustavo F. Padovan chan->num_conf_req++; 37150a708f8fSGustavo F. Padovan } 37161700915fSMat Martineau 37171700915fSMat Martineau return chan; 37184c89b6aaSMat Martineau } 37190a708f8fSGustavo F. Padovan 37204c89b6aaSMat Martineau static int l2cap_connect_req(struct l2cap_conn *conn, 37214c89b6aaSMat Martineau struct l2cap_cmd_hdr *cmd, u8 *data) 37224c89b6aaSMat Martineau { 3723300229f9SGustavo Padovan l2cap_connect(conn, cmd, data, L2CAP_CONN_RSP, 0); 37240a708f8fSGustavo F. Padovan return 0; 37250a708f8fSGustavo F. Padovan } 37260a708f8fSGustavo F. Padovan 37275909cf30SMat Martineau static int l2cap_connect_create_rsp(struct l2cap_conn *conn, 37282d792818SGustavo Padovan struct l2cap_cmd_hdr *cmd, u8 *data) 37290a708f8fSGustavo F. Padovan { 37300a708f8fSGustavo F. Padovan struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; 37310a708f8fSGustavo F. Padovan u16 scid, dcid, result, status; 373248454079SGustavo F. Padovan struct l2cap_chan *chan; 37330a708f8fSGustavo F. Padovan u8 req[128]; 37343df91ea2SAndrei Emeltchenko int err; 37350a708f8fSGustavo F. Padovan 37360a708f8fSGustavo F. Padovan scid = __le16_to_cpu(rsp->scid); 37370a708f8fSGustavo F. Padovan dcid = __le16_to_cpu(rsp->dcid); 37380a708f8fSGustavo F. Padovan result = __le16_to_cpu(rsp->result); 37390a708f8fSGustavo F. Padovan status = __le16_to_cpu(rsp->status); 37400a708f8fSGustavo F. Padovan 37411b009c98SAndrei Emeltchenko BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", 37421b009c98SAndrei Emeltchenko dcid, scid, result, status); 37430a708f8fSGustavo F. Padovan 37443df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 37453df91ea2SAndrei Emeltchenko 37460a708f8fSGustavo F. Padovan if (scid) { 37473df91ea2SAndrei Emeltchenko chan = __l2cap_get_chan_by_scid(conn, scid); 37483df91ea2SAndrei Emeltchenko if (!chan) { 37493df91ea2SAndrei Emeltchenko err = -EFAULT; 37503df91ea2SAndrei Emeltchenko goto unlock; 37513df91ea2SAndrei Emeltchenko } 37520a708f8fSGustavo F. Padovan } else { 37533df91ea2SAndrei Emeltchenko chan = __l2cap_get_chan_by_ident(conn, cmd->ident); 37543df91ea2SAndrei Emeltchenko if (!chan) { 37553df91ea2SAndrei Emeltchenko err = -EFAULT; 37563df91ea2SAndrei Emeltchenko goto unlock; 37573df91ea2SAndrei Emeltchenko } 37580a708f8fSGustavo F. Padovan } 37590a708f8fSGustavo F. Padovan 37603df91ea2SAndrei Emeltchenko err = 0; 37613df91ea2SAndrei Emeltchenko 37626be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 376348454079SGustavo F. Padovan 37640a708f8fSGustavo F. Padovan switch (result) { 37650a708f8fSGustavo F. Padovan case L2CAP_CR_SUCCESS: 376689bc500eSGustavo F. Padovan l2cap_state_change(chan, BT_CONFIG); 3767fc7f8a7eSGustavo F. Padovan chan->ident = 0; 3768fe4128e0SGustavo F. Padovan chan->dcid = dcid; 3769c1360a1cSGustavo F. Padovan clear_bit(CONF_CONNECT_PEND, &chan->conf_state); 37700a708f8fSGustavo F. Padovan 3771c1360a1cSGustavo F. Padovan if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) 37720a708f8fSGustavo F. Padovan break; 37730a708f8fSGustavo F. Padovan 37740a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 377573ffa904SGustavo F. Padovan l2cap_build_conf_req(chan, req), req); 377673ffa904SGustavo F. Padovan chan->num_conf_req++; 37770a708f8fSGustavo F. Padovan break; 37780a708f8fSGustavo F. Padovan 37790a708f8fSGustavo F. Padovan case L2CAP_CR_PEND: 3780c1360a1cSGustavo F. Padovan set_bit(CONF_CONNECT_PEND, &chan->conf_state); 37810a708f8fSGustavo F. Padovan break; 37820a708f8fSGustavo F. Padovan 37830a708f8fSGustavo F. Padovan default: 378448454079SGustavo F. Padovan l2cap_chan_del(chan, ECONNREFUSED); 37850a708f8fSGustavo F. Padovan break; 37860a708f8fSGustavo F. Padovan } 37870a708f8fSGustavo F. Padovan 37886be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 37893df91ea2SAndrei Emeltchenko 37903df91ea2SAndrei Emeltchenko unlock: 37913df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 37923df91ea2SAndrei Emeltchenko 37933df91ea2SAndrei Emeltchenko return err; 37940a708f8fSGustavo F. Padovan } 37950a708f8fSGustavo F. Padovan 379647d1ec61SGustavo F. Padovan static inline void set_default_fcs(struct l2cap_chan *chan) 37970a708f8fSGustavo F. Padovan { 37980a708f8fSGustavo F. Padovan /* FCS is enabled only in ERTM or streaming mode, if one or both 37990a708f8fSGustavo F. Padovan * sides request it. 38000a708f8fSGustavo F. Padovan */ 38010c1bc5c6SGustavo F. Padovan if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING) 380247d1ec61SGustavo F. Padovan chan->fcs = L2CAP_FCS_NONE; 3803c1360a1cSGustavo F. Padovan else if (!test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) 380447d1ec61SGustavo F. Padovan chan->fcs = L2CAP_FCS_CRC16; 38050a708f8fSGustavo F. Padovan } 38060a708f8fSGustavo F. Padovan 380729d8a590SAndrei Emeltchenko static void l2cap_send_efs_conf_rsp(struct l2cap_chan *chan, void *data, 380829d8a590SAndrei Emeltchenko u8 ident, u16 flags) 380929d8a590SAndrei Emeltchenko { 381029d8a590SAndrei Emeltchenko struct l2cap_conn *conn = chan->conn; 381129d8a590SAndrei Emeltchenko 381229d8a590SAndrei Emeltchenko BT_DBG("conn %p chan %p ident %d flags 0x%4.4x", conn, chan, ident, 381329d8a590SAndrei Emeltchenko flags); 381429d8a590SAndrei Emeltchenko 381529d8a590SAndrei Emeltchenko clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); 381629d8a590SAndrei Emeltchenko set_bit(CONF_OUTPUT_DONE, &chan->conf_state); 381729d8a590SAndrei Emeltchenko 381829d8a590SAndrei Emeltchenko l2cap_send_cmd(conn, ident, L2CAP_CONF_RSP, 381929d8a590SAndrei Emeltchenko l2cap_build_conf_rsp(chan, data, 382029d8a590SAndrei Emeltchenko L2CAP_CONF_SUCCESS, flags), data); 382129d8a590SAndrei Emeltchenko } 382229d8a590SAndrei Emeltchenko 38232d792818SGustavo Padovan static inline int l2cap_config_req(struct l2cap_conn *conn, 38242d792818SGustavo Padovan struct l2cap_cmd_hdr *cmd, u16 cmd_len, 38252d792818SGustavo Padovan u8 *data) 38260a708f8fSGustavo F. Padovan { 38270a708f8fSGustavo F. Padovan struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; 38280a708f8fSGustavo F. Padovan u16 dcid, flags; 38290a708f8fSGustavo F. Padovan u8 rsp[64]; 383048454079SGustavo F. Padovan struct l2cap_chan *chan; 38313c588192SMat Martineau int len, err = 0; 38320a708f8fSGustavo F. Padovan 38330a708f8fSGustavo F. Padovan dcid = __le16_to_cpu(req->dcid); 38340a708f8fSGustavo F. Padovan flags = __le16_to_cpu(req->flags); 38350a708f8fSGustavo F. Padovan 38360a708f8fSGustavo F. Padovan BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); 38370a708f8fSGustavo F. Padovan 3838baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, dcid); 383948454079SGustavo F. Padovan if (!chan) 38400a708f8fSGustavo F. Padovan return -ENOENT; 38410a708f8fSGustavo F. Padovan 3842033b1142SDavid S. Miller if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) { 3843e2fd318eSIlia Kolomisnky struct l2cap_cmd_rej_cid rej; 38440a708f8fSGustavo F. Padovan 3845ac73498cSAndrei Emeltchenko rej.reason = __constant_cpu_to_le16(L2CAP_REJ_INVALID_CID); 3846e2fd318eSIlia Kolomisnky rej.scid = cpu_to_le16(chan->scid); 3847e2fd318eSIlia Kolomisnky rej.dcid = cpu_to_le16(chan->dcid); 3848e2fd318eSIlia Kolomisnky 38490a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, 38500a708f8fSGustavo F. Padovan sizeof(rej), &rej); 38510a708f8fSGustavo F. Padovan goto unlock; 38520a708f8fSGustavo F. Padovan } 38530a708f8fSGustavo F. Padovan 38540a708f8fSGustavo F. Padovan /* Reject if config buffer is too small. */ 38550a708f8fSGustavo F. Padovan len = cmd_len - sizeof(*req); 38567ac28817SDan Rosenberg if (len < 0 || chan->conf_len + len > sizeof(chan->conf_req)) { 38570a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, 3858fe4128e0SGustavo F. Padovan l2cap_build_conf_rsp(chan, rsp, 38590a708f8fSGustavo F. Padovan L2CAP_CONF_REJECT, flags), rsp); 38600a708f8fSGustavo F. Padovan goto unlock; 38610a708f8fSGustavo F. Padovan } 38620a708f8fSGustavo F. Padovan 38630a708f8fSGustavo F. Padovan /* Store config. */ 386473ffa904SGustavo F. Padovan memcpy(chan->conf_req + chan->conf_len, req->data, len); 386573ffa904SGustavo F. Padovan chan->conf_len += len; 38660a708f8fSGustavo F. Padovan 386759e54bd1SAndrei Emeltchenko if (flags & L2CAP_CONF_FLAG_CONTINUATION) { 38680a708f8fSGustavo F. Padovan /* Incomplete config. Send empty response. */ 38690a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, 3870fe4128e0SGustavo F. Padovan l2cap_build_conf_rsp(chan, rsp, 38715325e5bbSAndrei Emeltchenko L2CAP_CONF_SUCCESS, flags), rsp); 38720a708f8fSGustavo F. Padovan goto unlock; 38730a708f8fSGustavo F. Padovan } 38740a708f8fSGustavo F. Padovan 38750a708f8fSGustavo F. Padovan /* Complete config. */ 387673ffa904SGustavo F. Padovan len = l2cap_parse_conf_req(chan, rsp); 38770a708f8fSGustavo F. Padovan if (len < 0) { 38785e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 38790a708f8fSGustavo F. Padovan goto unlock; 38800a708f8fSGustavo F. Padovan } 38810a708f8fSGustavo F. Padovan 38821500109bSMat Martineau chan->ident = cmd->ident; 38830a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); 388473ffa904SGustavo F. Padovan chan->num_conf_rsp++; 38850a708f8fSGustavo F. Padovan 38860a708f8fSGustavo F. Padovan /* Reset config buffer. */ 388773ffa904SGustavo F. Padovan chan->conf_len = 0; 38880a708f8fSGustavo F. Padovan 3889c1360a1cSGustavo F. Padovan if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) 38900a708f8fSGustavo F. Padovan goto unlock; 38910a708f8fSGustavo F. Padovan 3892c1360a1cSGustavo F. Padovan if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { 389347d1ec61SGustavo F. Padovan set_default_fcs(chan); 38940a708f8fSGustavo F. Padovan 3895105bdf9eSMat Martineau if (chan->mode == L2CAP_MODE_ERTM || 3896105bdf9eSMat Martineau chan->mode == L2CAP_MODE_STREAMING) 38973c588192SMat Martineau err = l2cap_ertm_init(chan); 38980a708f8fSGustavo F. Padovan 38993c588192SMat Martineau if (err < 0) 39005e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, -err); 39013c588192SMat Martineau else 3902cf4cd009SAndrei Emeltchenko l2cap_chan_ready(chan); 39033c588192SMat Martineau 39040a708f8fSGustavo F. Padovan goto unlock; 39050a708f8fSGustavo F. Padovan } 39060a708f8fSGustavo F. Padovan 3907c1360a1cSGustavo F. Padovan if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) { 39080a708f8fSGustavo F. Padovan u8 buf[64]; 39090a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 391073ffa904SGustavo F. Padovan l2cap_build_conf_req(chan, buf), buf); 391173ffa904SGustavo F. Padovan chan->num_conf_req++; 39120a708f8fSGustavo F. Padovan } 39130a708f8fSGustavo F. Padovan 39140e8b207eSAndrei Emeltchenko /* Got Conf Rsp PENDING from remote side and asume we sent 39150e8b207eSAndrei Emeltchenko Conf Rsp PENDING in the code above */ 39160e8b207eSAndrei Emeltchenko if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) && 39170e8b207eSAndrei Emeltchenko test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { 39180e8b207eSAndrei Emeltchenko 39190e8b207eSAndrei Emeltchenko /* check compatibility */ 39200e8b207eSAndrei Emeltchenko 392179de886dSAndrei Emeltchenko /* Send rsp for BR/EDR channel */ 3922f351bc72SAndrei Emeltchenko if (!chan->hs_hcon) 392329d8a590SAndrei Emeltchenko l2cap_send_efs_conf_rsp(chan, rsp, cmd->ident, flags); 392479de886dSAndrei Emeltchenko else 392579de886dSAndrei Emeltchenko chan->ident = cmd->ident; 39260e8b207eSAndrei Emeltchenko } 39270e8b207eSAndrei Emeltchenko 39280a708f8fSGustavo F. Padovan unlock: 39296be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 39303c588192SMat Martineau return err; 39310a708f8fSGustavo F. Padovan } 39320a708f8fSGustavo F. Padovan 39332d792818SGustavo Padovan static inline int l2cap_config_rsp(struct l2cap_conn *conn, 39342d792818SGustavo Padovan struct l2cap_cmd_hdr *cmd, u8 *data) 39350a708f8fSGustavo F. Padovan { 39360a708f8fSGustavo F. Padovan struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; 39370a708f8fSGustavo F. Padovan u16 scid, flags, result; 393848454079SGustavo F. Padovan struct l2cap_chan *chan; 393961386cbaSAndrei Emeltchenko int len = le16_to_cpu(cmd->len) - sizeof(*rsp); 39403c588192SMat Martineau int err = 0; 39410a708f8fSGustavo F. Padovan 39420a708f8fSGustavo F. Padovan scid = __le16_to_cpu(rsp->scid); 39430a708f8fSGustavo F. Padovan flags = __le16_to_cpu(rsp->flags); 39440a708f8fSGustavo F. Padovan result = __le16_to_cpu(rsp->result); 39450a708f8fSGustavo F. Padovan 394661386cbaSAndrei Emeltchenko BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags, 394761386cbaSAndrei Emeltchenko result, len); 39480a708f8fSGustavo F. Padovan 3949baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, scid); 395048454079SGustavo F. Padovan if (!chan) 39510a708f8fSGustavo F. Padovan return 0; 39520a708f8fSGustavo F. Padovan 39530a708f8fSGustavo F. Padovan switch (result) { 39540a708f8fSGustavo F. Padovan case L2CAP_CONF_SUCCESS: 395547d1ec61SGustavo F. Padovan l2cap_conf_rfc_get(chan, rsp->data, len); 39560e8b207eSAndrei Emeltchenko clear_bit(CONF_REM_CONF_PEND, &chan->conf_state); 39570a708f8fSGustavo F. Padovan break; 39580a708f8fSGustavo F. Padovan 39590e8b207eSAndrei Emeltchenko case L2CAP_CONF_PENDING: 39600e8b207eSAndrei Emeltchenko set_bit(CONF_REM_CONF_PEND, &chan->conf_state); 39610e8b207eSAndrei Emeltchenko 39620e8b207eSAndrei Emeltchenko if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { 39630e8b207eSAndrei Emeltchenko char buf[64]; 39640e8b207eSAndrei Emeltchenko 39650e8b207eSAndrei Emeltchenko len = l2cap_parse_conf_rsp(chan, rsp->data, len, 39660e8b207eSAndrei Emeltchenko buf, &result); 39670e8b207eSAndrei Emeltchenko if (len < 0) { 39685e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 39690e8b207eSAndrei Emeltchenko goto done; 39700e8b207eSAndrei Emeltchenko } 39710e8b207eSAndrei Emeltchenko 3972f351bc72SAndrei Emeltchenko if (!chan->hs_hcon) { 397379de886dSAndrei Emeltchenko l2cap_send_efs_conf_rsp(chan, buf, cmd->ident, 397479de886dSAndrei Emeltchenko 0); 39755ce66b59SAndrei Emeltchenko } else { 39765ce66b59SAndrei Emeltchenko if (l2cap_check_efs(chan)) { 39775ce66b59SAndrei Emeltchenko amp_create_logical_link(chan); 397879de886dSAndrei Emeltchenko chan->ident = cmd->ident; 39790e8b207eSAndrei Emeltchenko } 39805ce66b59SAndrei Emeltchenko } 39815ce66b59SAndrei Emeltchenko } 39820e8b207eSAndrei Emeltchenko goto done; 39830e8b207eSAndrei Emeltchenko 39840a708f8fSGustavo F. Padovan case L2CAP_CONF_UNACCEPT: 398573ffa904SGustavo F. Padovan if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { 39860a708f8fSGustavo F. Padovan char req[64]; 39870a708f8fSGustavo F. Padovan 39880a708f8fSGustavo F. Padovan if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { 39895e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 39900a708f8fSGustavo F. Padovan goto done; 39910a708f8fSGustavo F. Padovan } 39920a708f8fSGustavo F. Padovan 39930a708f8fSGustavo F. Padovan /* throw out any old stored conf requests */ 39940a708f8fSGustavo F. Padovan result = L2CAP_CONF_SUCCESS; 3995b4450035SGustavo F. Padovan len = l2cap_parse_conf_rsp(chan, rsp->data, len, 3996b4450035SGustavo F. Padovan req, &result); 39970a708f8fSGustavo F. Padovan if (len < 0) { 39985e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 39990a708f8fSGustavo F. Padovan goto done; 40000a708f8fSGustavo F. Padovan } 40010a708f8fSGustavo F. Padovan 40020a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), 40030a708f8fSGustavo F. Padovan L2CAP_CONF_REQ, len, req); 400473ffa904SGustavo F. Padovan chan->num_conf_req++; 40050a708f8fSGustavo F. Padovan if (result != L2CAP_CONF_SUCCESS) 40060a708f8fSGustavo F. Padovan goto done; 40070a708f8fSGustavo F. Padovan break; 40080a708f8fSGustavo F. Padovan } 40090a708f8fSGustavo F. Padovan 40100a708f8fSGustavo F. Padovan default: 40116be36555SAndrei Emeltchenko l2cap_chan_set_err(chan, ECONNRESET); 40122e0052e4SAndrei Emeltchenko 4013ba13ccd9SMarcel Holtmann __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT); 40145e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 40150a708f8fSGustavo F. Padovan goto done; 40160a708f8fSGustavo F. Padovan } 40170a708f8fSGustavo F. Padovan 401859e54bd1SAndrei Emeltchenko if (flags & L2CAP_CONF_FLAG_CONTINUATION) 40190a708f8fSGustavo F. Padovan goto done; 40200a708f8fSGustavo F. Padovan 4021c1360a1cSGustavo F. Padovan set_bit(CONF_INPUT_DONE, &chan->conf_state); 40220a708f8fSGustavo F. Padovan 4023c1360a1cSGustavo F. Padovan if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) { 402447d1ec61SGustavo F. Padovan set_default_fcs(chan); 40250a708f8fSGustavo F. Padovan 4026105bdf9eSMat Martineau if (chan->mode == L2CAP_MODE_ERTM || 4027105bdf9eSMat Martineau chan->mode == L2CAP_MODE_STREAMING) 40283c588192SMat Martineau err = l2cap_ertm_init(chan); 40290a708f8fSGustavo F. Padovan 40303c588192SMat Martineau if (err < 0) 40315e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, -err); 40323c588192SMat Martineau else 4033cf4cd009SAndrei Emeltchenko l2cap_chan_ready(chan); 40340a708f8fSGustavo F. Padovan } 40350a708f8fSGustavo F. Padovan 40360a708f8fSGustavo F. Padovan done: 40376be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 40383c588192SMat Martineau return err; 40390a708f8fSGustavo F. Padovan } 40400a708f8fSGustavo F. Padovan 40412d792818SGustavo Padovan static inline int l2cap_disconnect_req(struct l2cap_conn *conn, 40422d792818SGustavo Padovan struct l2cap_cmd_hdr *cmd, u8 *data) 40430a708f8fSGustavo F. Padovan { 40440a708f8fSGustavo F. Padovan struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; 40450a708f8fSGustavo F. Padovan struct l2cap_disconn_rsp rsp; 40460a708f8fSGustavo F. Padovan u16 dcid, scid; 404748454079SGustavo F. Padovan struct l2cap_chan *chan; 40480a708f8fSGustavo F. Padovan struct sock *sk; 40490a708f8fSGustavo F. Padovan 40500a708f8fSGustavo F. Padovan scid = __le16_to_cpu(req->scid); 40510a708f8fSGustavo F. Padovan dcid = __le16_to_cpu(req->dcid); 40520a708f8fSGustavo F. Padovan 40530a708f8fSGustavo F. Padovan BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); 40540a708f8fSGustavo F. Padovan 40553df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 40563df91ea2SAndrei Emeltchenko 40573df91ea2SAndrei Emeltchenko chan = __l2cap_get_chan_by_scid(conn, dcid); 40583df91ea2SAndrei Emeltchenko if (!chan) { 40593df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 40600a708f8fSGustavo F. Padovan return 0; 40613df91ea2SAndrei Emeltchenko } 40620a708f8fSGustavo F. Padovan 40636be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 40646be36555SAndrei Emeltchenko 406548454079SGustavo F. Padovan sk = chan->sk; 406648454079SGustavo F. Padovan 4067fe4128e0SGustavo F. Padovan rsp.dcid = cpu_to_le16(chan->scid); 4068fe4128e0SGustavo F. Padovan rsp.scid = cpu_to_le16(chan->dcid); 40690a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); 40700a708f8fSGustavo F. Padovan 40716be36555SAndrei Emeltchenko lock_sock(sk); 40720a708f8fSGustavo F. Padovan sk->sk_shutdown = SHUTDOWN_MASK; 40736be36555SAndrei Emeltchenko release_sock(sk); 40740a708f8fSGustavo F. Padovan 407561d6ef3eSMat Martineau l2cap_chan_hold(chan); 407648454079SGustavo F. Padovan l2cap_chan_del(chan, ECONNRESET); 40776be36555SAndrei Emeltchenko 40786be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 40790a708f8fSGustavo F. Padovan 408080b98027SGustavo Padovan chan->ops->close(chan); 408161d6ef3eSMat Martineau l2cap_chan_put(chan); 40823df91ea2SAndrei Emeltchenko 40833df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 40843df91ea2SAndrei Emeltchenko 40850a708f8fSGustavo F. Padovan return 0; 40860a708f8fSGustavo F. Padovan } 40870a708f8fSGustavo F. Padovan 40882d792818SGustavo Padovan static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, 40892d792818SGustavo Padovan struct l2cap_cmd_hdr *cmd, u8 *data) 40900a708f8fSGustavo F. Padovan { 40910a708f8fSGustavo F. Padovan struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; 40920a708f8fSGustavo F. Padovan u16 dcid, scid; 409348454079SGustavo F. Padovan struct l2cap_chan *chan; 40940a708f8fSGustavo F. Padovan 40950a708f8fSGustavo F. Padovan scid = __le16_to_cpu(rsp->scid); 40960a708f8fSGustavo F. Padovan dcid = __le16_to_cpu(rsp->dcid); 40970a708f8fSGustavo F. Padovan 40980a708f8fSGustavo F. Padovan BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); 40990a708f8fSGustavo F. Padovan 41003df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 41013df91ea2SAndrei Emeltchenko 41023df91ea2SAndrei Emeltchenko chan = __l2cap_get_chan_by_scid(conn, scid); 41033df91ea2SAndrei Emeltchenko if (!chan) { 41043df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 41050a708f8fSGustavo F. Padovan return 0; 41063df91ea2SAndrei Emeltchenko } 41070a708f8fSGustavo F. Padovan 41086be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 410948454079SGustavo F. Padovan 411061d6ef3eSMat Martineau l2cap_chan_hold(chan); 411148454079SGustavo F. Padovan l2cap_chan_del(chan, 0); 41126be36555SAndrei Emeltchenko 41136be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 41140a708f8fSGustavo F. Padovan 411580b98027SGustavo Padovan chan->ops->close(chan); 411661d6ef3eSMat Martineau l2cap_chan_put(chan); 41173df91ea2SAndrei Emeltchenko 41183df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 41193df91ea2SAndrei Emeltchenko 41200a708f8fSGustavo F. Padovan return 0; 41210a708f8fSGustavo F. Padovan } 41220a708f8fSGustavo F. Padovan 41232d792818SGustavo Padovan static inline int l2cap_information_req(struct l2cap_conn *conn, 41242d792818SGustavo Padovan struct l2cap_cmd_hdr *cmd, u8 *data) 41250a708f8fSGustavo F. Padovan { 41260a708f8fSGustavo F. Padovan struct l2cap_info_req *req = (struct l2cap_info_req *) data; 41270a708f8fSGustavo F. Padovan u16 type; 41280a708f8fSGustavo F. Padovan 41290a708f8fSGustavo F. Padovan type = __le16_to_cpu(req->type); 41300a708f8fSGustavo F. Padovan 41310a708f8fSGustavo F. Padovan BT_DBG("type 0x%4.4x", type); 41320a708f8fSGustavo F. Padovan 41330a708f8fSGustavo F. Padovan if (type == L2CAP_IT_FEAT_MASK) { 41340a708f8fSGustavo F. Padovan u8 buf[8]; 41350a708f8fSGustavo F. Padovan u32 feat_mask = l2cap_feat_mask; 41360a708f8fSGustavo F. Padovan struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; 4137ac73498cSAndrei Emeltchenko rsp->type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); 4138ac73498cSAndrei Emeltchenko rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS); 41390a708f8fSGustavo F. Padovan if (!disable_ertm) 41400a708f8fSGustavo F. Padovan feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING 41410a708f8fSGustavo F. Padovan | L2CAP_FEAT_FCS; 4142a5fd6f30SAndrei Emeltchenko if (enable_hs) 41436327eb98SAndrei Emeltchenko feat_mask |= L2CAP_FEAT_EXT_FLOW 41446327eb98SAndrei Emeltchenko | L2CAP_FEAT_EXT_WINDOW; 4145a5fd6f30SAndrei Emeltchenko 41460a708f8fSGustavo F. Padovan put_unaligned_le32(feat_mask, rsp->data); 41472d792818SGustavo Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf), 41482d792818SGustavo Padovan buf); 41490a708f8fSGustavo F. Padovan } else if (type == L2CAP_IT_FIXED_CHAN) { 41500a708f8fSGustavo F. Padovan u8 buf[12]; 41510a708f8fSGustavo F. Padovan struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; 415250a147cdSMat Martineau 415350a147cdSMat Martineau if (enable_hs) 415450a147cdSMat Martineau l2cap_fixed_chan[0] |= L2CAP_FC_A2MP; 415550a147cdSMat Martineau else 415650a147cdSMat Martineau l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP; 415750a147cdSMat Martineau 4158ac73498cSAndrei Emeltchenko rsp->type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN); 4159ac73498cSAndrei Emeltchenko rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS); 4160c6337ea6SAndrei Emeltchenko memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan)); 41612d792818SGustavo Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf), 41622d792818SGustavo Padovan buf); 41630a708f8fSGustavo F. Padovan } else { 41640a708f8fSGustavo F. Padovan struct l2cap_info_rsp rsp; 41650a708f8fSGustavo F. Padovan rsp.type = cpu_to_le16(type); 4166ac73498cSAndrei Emeltchenko rsp.result = __constant_cpu_to_le16(L2CAP_IR_NOTSUPP); 41672d792818SGustavo Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(rsp), 41682d792818SGustavo Padovan &rsp); 41690a708f8fSGustavo F. Padovan } 41700a708f8fSGustavo F. Padovan 41710a708f8fSGustavo F. Padovan return 0; 41720a708f8fSGustavo F. Padovan } 41730a708f8fSGustavo F. Padovan 41742d792818SGustavo Padovan static inline int l2cap_information_rsp(struct l2cap_conn *conn, 41752d792818SGustavo Padovan struct l2cap_cmd_hdr *cmd, u8 *data) 41760a708f8fSGustavo F. Padovan { 41770a708f8fSGustavo F. Padovan struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; 41780a708f8fSGustavo F. Padovan u16 type, result; 41790a708f8fSGustavo F. Padovan 41800a708f8fSGustavo F. Padovan type = __le16_to_cpu(rsp->type); 41810a708f8fSGustavo F. Padovan result = __le16_to_cpu(rsp->result); 41820a708f8fSGustavo F. Padovan 41830a708f8fSGustavo F. Padovan BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); 41840a708f8fSGustavo F. Padovan 4185e90165beSAndrei Emeltchenko /* L2CAP Info req/rsp are unbound to channels, add extra checks */ 4186e90165beSAndrei Emeltchenko if (cmd->ident != conn->info_ident || 4187e90165beSAndrei Emeltchenko conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) 4188e90165beSAndrei Emeltchenko return 0; 4189e90165beSAndrei Emeltchenko 419017cd3f37SUlisses Furquim cancel_delayed_work(&conn->info_timer); 41910a708f8fSGustavo F. Padovan 41920a708f8fSGustavo F. Padovan if (result != L2CAP_IR_SUCCESS) { 41930a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 41940a708f8fSGustavo F. Padovan conn->info_ident = 0; 41950a708f8fSGustavo F. Padovan 41960a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 41970a708f8fSGustavo F. Padovan 41980a708f8fSGustavo F. Padovan return 0; 41990a708f8fSGustavo F. Padovan } 42000a708f8fSGustavo F. Padovan 4201978c93b9SAndrei Emeltchenko switch (type) { 4202978c93b9SAndrei Emeltchenko case L2CAP_IT_FEAT_MASK: 42030a708f8fSGustavo F. Padovan conn->feat_mask = get_unaligned_le32(rsp->data); 42040a708f8fSGustavo F. Padovan 42050a708f8fSGustavo F. Padovan if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { 42060a708f8fSGustavo F. Padovan struct l2cap_info_req req; 4207ac73498cSAndrei Emeltchenko req.type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN); 42080a708f8fSGustavo F. Padovan 42090a708f8fSGustavo F. Padovan conn->info_ident = l2cap_get_ident(conn); 42100a708f8fSGustavo F. Padovan 42110a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, conn->info_ident, 42120a708f8fSGustavo F. Padovan L2CAP_INFO_REQ, sizeof(req), &req); 42130a708f8fSGustavo F. Padovan } else { 42140a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 42150a708f8fSGustavo F. Padovan conn->info_ident = 0; 42160a708f8fSGustavo F. Padovan 42170a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 42180a708f8fSGustavo F. Padovan } 4219978c93b9SAndrei Emeltchenko break; 4220978c93b9SAndrei Emeltchenko 4221978c93b9SAndrei Emeltchenko case L2CAP_IT_FIXED_CHAN: 4222978c93b9SAndrei Emeltchenko conn->fixed_chan_mask = rsp->data[0]; 42230a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 42240a708f8fSGustavo F. Padovan conn->info_ident = 0; 42250a708f8fSGustavo F. Padovan 42260a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 4227978c93b9SAndrei Emeltchenko break; 42280a708f8fSGustavo F. Padovan } 42290a708f8fSGustavo F. Padovan 42300a708f8fSGustavo F. Padovan return 0; 42310a708f8fSGustavo F. Padovan } 42320a708f8fSGustavo F. Padovan 42331700915fSMat Martineau static int l2cap_create_channel_req(struct l2cap_conn *conn, 42342d792818SGustavo Padovan struct l2cap_cmd_hdr *cmd, 42352d792818SGustavo Padovan u16 cmd_len, void *data) 4236f94ff6ffSMat Martineau { 4237f94ff6ffSMat Martineau struct l2cap_create_chan_req *req = data; 42386e1df6a6SAndrei Emeltchenko struct l2cap_create_chan_rsp rsp; 42391700915fSMat Martineau struct l2cap_chan *chan; 42406e1df6a6SAndrei Emeltchenko struct hci_dev *hdev; 4241f94ff6ffSMat Martineau u16 psm, scid; 4242f94ff6ffSMat Martineau 4243f94ff6ffSMat Martineau if (cmd_len != sizeof(*req)) 4244f94ff6ffSMat Martineau return -EPROTO; 4245f94ff6ffSMat Martineau 4246f94ff6ffSMat Martineau if (!enable_hs) 4247f94ff6ffSMat Martineau return -EINVAL; 4248f94ff6ffSMat Martineau 4249f94ff6ffSMat Martineau psm = le16_to_cpu(req->psm); 4250f94ff6ffSMat Martineau scid = le16_to_cpu(req->scid); 4251f94ff6ffSMat Martineau 4252ad0ac6caSAndrei Emeltchenko BT_DBG("psm 0x%2.2x, scid 0x%4.4x, amp_id %d", psm, scid, req->amp_id); 4253f94ff6ffSMat Martineau 42546e1df6a6SAndrei Emeltchenko /* For controller id 0 make BR/EDR connection */ 42556e1df6a6SAndrei Emeltchenko if (req->amp_id == HCI_BREDR_ID) { 42566e1df6a6SAndrei Emeltchenko l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP, 42576e1df6a6SAndrei Emeltchenko req->amp_id); 42586e1df6a6SAndrei Emeltchenko return 0; 42596e1df6a6SAndrei Emeltchenko } 42601700915fSMat Martineau 42611700915fSMat Martineau /* Validate AMP controller id */ 42621700915fSMat Martineau hdev = hci_dev_get(req->amp_id); 42636e1df6a6SAndrei Emeltchenko if (!hdev) 42646e1df6a6SAndrei Emeltchenko goto error; 42651700915fSMat Martineau 42666e1df6a6SAndrei Emeltchenko if (hdev->dev_type != HCI_AMP || !test_bit(HCI_UP, &hdev->flags)) { 42676e1df6a6SAndrei Emeltchenko hci_dev_put(hdev); 42686e1df6a6SAndrei Emeltchenko goto error; 42696e1df6a6SAndrei Emeltchenko } 42706e1df6a6SAndrei Emeltchenko 42716e1df6a6SAndrei Emeltchenko chan = l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP, 42726e1df6a6SAndrei Emeltchenko req->amp_id); 42736e1df6a6SAndrei Emeltchenko if (chan) { 42746e1df6a6SAndrei Emeltchenko struct amp_mgr *mgr = conn->hcon->amp_mgr; 42756e1df6a6SAndrei Emeltchenko struct hci_conn *hs_hcon; 42766e1df6a6SAndrei Emeltchenko 42776e1df6a6SAndrei Emeltchenko hs_hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK, conn->dst); 42786e1df6a6SAndrei Emeltchenko if (!hs_hcon) { 42796e1df6a6SAndrei Emeltchenko hci_dev_put(hdev); 42806e1df6a6SAndrei Emeltchenko return -EFAULT; 42816e1df6a6SAndrei Emeltchenko } 42826e1df6a6SAndrei Emeltchenko 42836e1df6a6SAndrei Emeltchenko BT_DBG("mgr %p bredr_chan %p hs_hcon %p", mgr, chan, hs_hcon); 42846e1df6a6SAndrei Emeltchenko 42856e1df6a6SAndrei Emeltchenko mgr->bredr_chan = chan; 42866e1df6a6SAndrei Emeltchenko chan->hs_hcon = hs_hcon; 4287fd45bf4cSAndrei Emeltchenko chan->fcs = L2CAP_FCS_NONE; 42886e1df6a6SAndrei Emeltchenko conn->mtu = hdev->block_mtu; 42896e1df6a6SAndrei Emeltchenko } 42906e1df6a6SAndrei Emeltchenko 42916e1df6a6SAndrei Emeltchenko hci_dev_put(hdev); 42926e1df6a6SAndrei Emeltchenko 42936e1df6a6SAndrei Emeltchenko return 0; 42946e1df6a6SAndrei Emeltchenko 42956e1df6a6SAndrei Emeltchenko error: 4296f94ff6ffSMat Martineau rsp.dcid = 0; 4297f94ff6ffSMat Martineau rsp.scid = cpu_to_le16(scid); 42981700915fSMat Martineau rsp.result = __constant_cpu_to_le16(L2CAP_CR_BAD_AMP); 42998ce0c498SAndrei Emeltchenko rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); 4300f94ff6ffSMat Martineau 4301f94ff6ffSMat Martineau l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP, 4302f94ff6ffSMat Martineau sizeof(rsp), &rsp); 4303f94ff6ffSMat Martineau 43046e1df6a6SAndrei Emeltchenko return -EFAULT; 4305f94ff6ffSMat Martineau } 4306f94ff6ffSMat Martineau 43078eb200bdSMat Martineau static void l2cap_send_move_chan_req(struct l2cap_chan *chan, u8 dest_amp_id) 43088eb200bdSMat Martineau { 43098eb200bdSMat Martineau struct l2cap_move_chan_req req; 43108eb200bdSMat Martineau u8 ident; 43118eb200bdSMat Martineau 43128eb200bdSMat Martineau BT_DBG("chan %p, dest_amp_id %d", chan, dest_amp_id); 43138eb200bdSMat Martineau 43148eb200bdSMat Martineau ident = l2cap_get_ident(chan->conn); 43158eb200bdSMat Martineau chan->ident = ident; 43168eb200bdSMat Martineau 43178eb200bdSMat Martineau req.icid = cpu_to_le16(chan->scid); 43188eb200bdSMat Martineau req.dest_amp_id = dest_amp_id; 43198eb200bdSMat Martineau 43208eb200bdSMat Martineau l2cap_send_cmd(chan->conn, ident, L2CAP_MOVE_CHAN_REQ, sizeof(req), 43218eb200bdSMat Martineau &req); 43228eb200bdSMat Martineau 43238eb200bdSMat Martineau __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT); 43248eb200bdSMat Martineau } 43258eb200bdSMat Martineau 43261500109bSMat Martineau static void l2cap_send_move_chan_rsp(struct l2cap_chan *chan, u16 result) 43278d5a04a1SMat Martineau { 43288d5a04a1SMat Martineau struct l2cap_move_chan_rsp rsp; 43298d5a04a1SMat Martineau 43301500109bSMat Martineau BT_DBG("chan %p, result 0x%4.4x", chan, result); 43318d5a04a1SMat Martineau 43321500109bSMat Martineau rsp.icid = cpu_to_le16(chan->dcid); 43338d5a04a1SMat Martineau rsp.result = cpu_to_le16(result); 43348d5a04a1SMat Martineau 43351500109bSMat Martineau l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_RSP, 43361500109bSMat Martineau sizeof(rsp), &rsp); 43378d5a04a1SMat Martineau } 43388d5a04a1SMat Martineau 43395b155ef9SMat Martineau static void l2cap_send_move_chan_cfm(struct l2cap_chan *chan, u16 result) 43408d5a04a1SMat Martineau { 43418d5a04a1SMat Martineau struct l2cap_move_chan_cfm cfm; 43428d5a04a1SMat Martineau 43435b155ef9SMat Martineau BT_DBG("chan %p, result 0x%4.4x", chan, result); 43448d5a04a1SMat Martineau 43455b155ef9SMat Martineau chan->ident = l2cap_get_ident(chan->conn); 43468d5a04a1SMat Martineau 43475b155ef9SMat Martineau cfm.icid = cpu_to_le16(chan->scid); 43488d5a04a1SMat Martineau cfm.result = cpu_to_le16(result); 43498d5a04a1SMat Martineau 43505b155ef9SMat Martineau l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_CFM, 43515b155ef9SMat Martineau sizeof(cfm), &cfm); 43525b155ef9SMat Martineau 43535b155ef9SMat Martineau __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT); 43545b155ef9SMat Martineau } 43555b155ef9SMat Martineau 43565b155ef9SMat Martineau static void l2cap_send_move_chan_cfm_icid(struct l2cap_conn *conn, u16 icid) 43575b155ef9SMat Martineau { 43585b155ef9SMat Martineau struct l2cap_move_chan_cfm cfm; 43595b155ef9SMat Martineau 43605b155ef9SMat Martineau BT_DBG("conn %p, icid 0x%4.4x", conn, icid); 43615b155ef9SMat Martineau 43625b155ef9SMat Martineau cfm.icid = cpu_to_le16(icid); 43635b155ef9SMat Martineau cfm.result = __constant_cpu_to_le16(L2CAP_MC_UNCONFIRMED); 43645b155ef9SMat Martineau 43655b155ef9SMat Martineau l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_MOVE_CHAN_CFM, 43665b155ef9SMat Martineau sizeof(cfm), &cfm); 43678d5a04a1SMat Martineau } 43688d5a04a1SMat Martineau 43698d5a04a1SMat Martineau static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident, 43708d5a04a1SMat Martineau u16 icid) 43718d5a04a1SMat Martineau { 43728d5a04a1SMat Martineau struct l2cap_move_chan_cfm_rsp rsp; 43738d5a04a1SMat Martineau 4374ad0ac6caSAndrei Emeltchenko BT_DBG("icid 0x%4.4x", icid); 43758d5a04a1SMat Martineau 43768d5a04a1SMat Martineau rsp.icid = cpu_to_le16(icid); 43778d5a04a1SMat Martineau l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp); 43788d5a04a1SMat Martineau } 43798d5a04a1SMat Martineau 43805f3847a4SMat Martineau static void __release_logical_link(struct l2cap_chan *chan) 43815f3847a4SMat Martineau { 43825f3847a4SMat Martineau chan->hs_hchan = NULL; 43835f3847a4SMat Martineau chan->hs_hcon = NULL; 43845f3847a4SMat Martineau 43855f3847a4SMat Martineau /* Placeholder - release the logical link */ 43865f3847a4SMat Martineau } 43875f3847a4SMat Martineau 43881500109bSMat Martineau static void l2cap_logical_fail(struct l2cap_chan *chan) 43891500109bSMat Martineau { 43901500109bSMat Martineau /* Logical link setup failed */ 43911500109bSMat Martineau if (chan->state != BT_CONNECTED) { 43921500109bSMat Martineau /* Create channel failure, disconnect */ 43935e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 43941500109bSMat Martineau return; 43951500109bSMat Martineau } 43961500109bSMat Martineau 43971500109bSMat Martineau switch (chan->move_role) { 43981500109bSMat Martineau case L2CAP_MOVE_ROLE_RESPONDER: 43991500109bSMat Martineau l2cap_move_done(chan); 44001500109bSMat Martineau l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_SUPP); 44011500109bSMat Martineau break; 44021500109bSMat Martineau case L2CAP_MOVE_ROLE_INITIATOR: 44031500109bSMat Martineau if (chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_COMP || 44041500109bSMat Martineau chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_CFM) { 44051500109bSMat Martineau /* Remote has only sent pending or 44061500109bSMat Martineau * success responses, clean up 44071500109bSMat Martineau */ 44081500109bSMat Martineau l2cap_move_done(chan); 44091500109bSMat Martineau } 44101500109bSMat Martineau 44111500109bSMat Martineau /* Other amp move states imply that the move 44121500109bSMat Martineau * has already aborted 44131500109bSMat Martineau */ 44141500109bSMat Martineau l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); 44151500109bSMat Martineau break; 44161500109bSMat Martineau } 44171500109bSMat Martineau } 44181500109bSMat Martineau 44191500109bSMat Martineau static void l2cap_logical_finish_create(struct l2cap_chan *chan, 44201500109bSMat Martineau struct hci_chan *hchan) 44211500109bSMat Martineau { 44221500109bSMat Martineau struct l2cap_conf_rsp rsp; 44231500109bSMat Martineau 4424336178a3SAndrei Emeltchenko chan->hs_hchan = hchan; 44251500109bSMat Martineau chan->hs_hcon->l2cap_data = chan->conn; 44261500109bSMat Martineau 442735ba9561SAndrei Emeltchenko l2cap_send_efs_conf_rsp(chan, &rsp, chan->ident, 0); 44281500109bSMat Martineau 44291500109bSMat Martineau if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { 4430fe79c6feSAndrei Emeltchenko int err; 44311500109bSMat Martineau 44321500109bSMat Martineau set_default_fcs(chan); 44331500109bSMat Martineau 44341500109bSMat Martineau err = l2cap_ertm_init(chan); 44351500109bSMat Martineau if (err < 0) 44365e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, -err); 44371500109bSMat Martineau else 44381500109bSMat Martineau l2cap_chan_ready(chan); 44391500109bSMat Martineau } 44401500109bSMat Martineau } 44411500109bSMat Martineau 44421500109bSMat Martineau static void l2cap_logical_finish_move(struct l2cap_chan *chan, 44431500109bSMat Martineau struct hci_chan *hchan) 44441500109bSMat Martineau { 44451500109bSMat Martineau chan->hs_hcon = hchan->conn; 44461500109bSMat Martineau chan->hs_hcon->l2cap_data = chan->conn; 44471500109bSMat Martineau 44481500109bSMat Martineau BT_DBG("move_state %d", chan->move_state); 44491500109bSMat Martineau 44501500109bSMat Martineau switch (chan->move_state) { 44511500109bSMat Martineau case L2CAP_MOVE_WAIT_LOGICAL_COMP: 44521500109bSMat Martineau /* Move confirm will be sent after a success 44531500109bSMat Martineau * response is received 44541500109bSMat Martineau */ 44551500109bSMat Martineau chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS; 44561500109bSMat Martineau break; 44571500109bSMat Martineau case L2CAP_MOVE_WAIT_LOGICAL_CFM: 44581500109bSMat Martineau if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { 44591500109bSMat Martineau chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY; 44601500109bSMat Martineau } else if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) { 44611500109bSMat Martineau chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP; 44621500109bSMat Martineau l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED); 44631500109bSMat Martineau } else if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) { 44641500109bSMat Martineau chan->move_state = L2CAP_MOVE_WAIT_CONFIRM; 44651500109bSMat Martineau l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS); 44661500109bSMat Martineau } 44671500109bSMat Martineau break; 44681500109bSMat Martineau default: 44691500109bSMat Martineau /* Move was not in expected state, free the channel */ 44701500109bSMat Martineau __release_logical_link(chan); 44711500109bSMat Martineau 44721500109bSMat Martineau chan->move_state = L2CAP_MOVE_STABLE; 44731500109bSMat Martineau } 44741500109bSMat Martineau } 44751500109bSMat Martineau 44761500109bSMat Martineau /* Call with chan locked */ 447727695fb4SAndrei Emeltchenko void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan, 44785b155ef9SMat Martineau u8 status) 44795b155ef9SMat Martineau { 44801500109bSMat Martineau BT_DBG("chan %p, hchan %p, status %d", chan, hchan, status); 44811500109bSMat Martineau 44821500109bSMat Martineau if (status) { 44831500109bSMat Martineau l2cap_logical_fail(chan); 44841500109bSMat Martineau __release_logical_link(chan); 44855b155ef9SMat Martineau return; 44865b155ef9SMat Martineau } 44875b155ef9SMat Martineau 44881500109bSMat Martineau if (chan->state != BT_CONNECTED) { 44891500109bSMat Martineau /* Ignore logical link if channel is on BR/EDR */ 44901500109bSMat Martineau if (chan->local_amp_id) 44911500109bSMat Martineau l2cap_logical_finish_create(chan, hchan); 44921500109bSMat Martineau } else { 44931500109bSMat Martineau l2cap_logical_finish_move(chan, hchan); 44941500109bSMat Martineau } 44951500109bSMat Martineau } 44961500109bSMat Martineau 44973f7a56c4SMat Martineau void l2cap_move_start(struct l2cap_chan *chan) 44983f7a56c4SMat Martineau { 44993f7a56c4SMat Martineau BT_DBG("chan %p", chan); 45003f7a56c4SMat Martineau 45013f7a56c4SMat Martineau if (chan->local_amp_id == HCI_BREDR_ID) { 45023f7a56c4SMat Martineau if (chan->chan_policy != BT_CHANNEL_POLICY_AMP_PREFERRED) 45033f7a56c4SMat Martineau return; 45043f7a56c4SMat Martineau chan->move_role = L2CAP_MOVE_ROLE_INITIATOR; 45053f7a56c4SMat Martineau chan->move_state = L2CAP_MOVE_WAIT_PREPARE; 45063f7a56c4SMat Martineau /* Placeholder - start physical link setup */ 45073f7a56c4SMat Martineau } else { 45083f7a56c4SMat Martineau chan->move_role = L2CAP_MOVE_ROLE_INITIATOR; 45093f7a56c4SMat Martineau chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS; 45103f7a56c4SMat Martineau chan->move_id = 0; 45113f7a56c4SMat Martineau l2cap_move_setup(chan); 45123f7a56c4SMat Martineau l2cap_send_move_chan_req(chan, 0); 45133f7a56c4SMat Martineau } 45143f7a56c4SMat Martineau } 45153f7a56c4SMat Martineau 45168eb200bdSMat Martineau static void l2cap_do_create(struct l2cap_chan *chan, int result, 45178eb200bdSMat Martineau u8 local_amp_id, u8 remote_amp_id) 45188eb200bdSMat Martineau { 451962748ca1SAndrei Emeltchenko BT_DBG("chan %p state %s %u -> %u", chan, state_to_string(chan->state), 452062748ca1SAndrei Emeltchenko local_amp_id, remote_amp_id); 452162748ca1SAndrei Emeltchenko 452212d6cc60SAndrei Emeltchenko chan->fcs = L2CAP_FCS_NONE; 452312d6cc60SAndrei Emeltchenko 452462748ca1SAndrei Emeltchenko /* Outgoing channel on AMP */ 452562748ca1SAndrei Emeltchenko if (chan->state == BT_CONNECT) { 452662748ca1SAndrei Emeltchenko if (result == L2CAP_CR_SUCCESS) { 452762748ca1SAndrei Emeltchenko chan->local_amp_id = local_amp_id; 452862748ca1SAndrei Emeltchenko l2cap_send_create_chan_req(chan, remote_amp_id); 452962748ca1SAndrei Emeltchenko } else { 453062748ca1SAndrei Emeltchenko /* Revert to BR/EDR connect */ 453162748ca1SAndrei Emeltchenko l2cap_send_conn_req(chan); 453262748ca1SAndrei Emeltchenko } 453362748ca1SAndrei Emeltchenko 453462748ca1SAndrei Emeltchenko return; 453562748ca1SAndrei Emeltchenko } 453662748ca1SAndrei Emeltchenko 453762748ca1SAndrei Emeltchenko /* Incoming channel on AMP */ 453862748ca1SAndrei Emeltchenko if (__l2cap_no_conn_pending(chan)) { 45398eb200bdSMat Martineau struct l2cap_conn_rsp rsp; 45408eb200bdSMat Martineau char buf[128]; 45418eb200bdSMat Martineau rsp.scid = cpu_to_le16(chan->dcid); 45428eb200bdSMat Martineau rsp.dcid = cpu_to_le16(chan->scid); 45438eb200bdSMat Martineau 45448eb200bdSMat Martineau if (result == L2CAP_CR_SUCCESS) { 45458eb200bdSMat Martineau /* Send successful response */ 454662cd50e2SAndrei Emeltchenko rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS); 454762cd50e2SAndrei Emeltchenko rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); 45488eb200bdSMat Martineau } else { 45498eb200bdSMat Martineau /* Send negative response */ 455062cd50e2SAndrei Emeltchenko rsp.result = __constant_cpu_to_le16(L2CAP_CR_NO_MEM); 455162cd50e2SAndrei Emeltchenko rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); 45528eb200bdSMat Martineau } 45538eb200bdSMat Martineau 45548eb200bdSMat Martineau l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_RSP, 45558eb200bdSMat Martineau sizeof(rsp), &rsp); 45568eb200bdSMat Martineau 45578eb200bdSMat Martineau if (result == L2CAP_CR_SUCCESS) { 45588eb200bdSMat Martineau __l2cap_state_change(chan, BT_CONFIG); 45598eb200bdSMat Martineau set_bit(CONF_REQ_SENT, &chan->conf_state); 45608eb200bdSMat Martineau l2cap_send_cmd(chan->conn, l2cap_get_ident(chan->conn), 45618eb200bdSMat Martineau L2CAP_CONF_REQ, 45628eb200bdSMat Martineau l2cap_build_conf_req(chan, buf), buf); 45638eb200bdSMat Martineau chan->num_conf_req++; 45648eb200bdSMat Martineau } 45658eb200bdSMat Martineau } 45668eb200bdSMat Martineau } 45678eb200bdSMat Martineau 45688eb200bdSMat Martineau static void l2cap_do_move_initiate(struct l2cap_chan *chan, u8 local_amp_id, 45698eb200bdSMat Martineau u8 remote_amp_id) 45708eb200bdSMat Martineau { 45718eb200bdSMat Martineau l2cap_move_setup(chan); 45728eb200bdSMat Martineau chan->move_id = local_amp_id; 45738eb200bdSMat Martineau chan->move_state = L2CAP_MOVE_WAIT_RSP; 45748eb200bdSMat Martineau 45758eb200bdSMat Martineau l2cap_send_move_chan_req(chan, remote_amp_id); 45768eb200bdSMat Martineau } 45778eb200bdSMat Martineau 45788eb200bdSMat Martineau static void l2cap_do_move_respond(struct l2cap_chan *chan, int result) 45798eb200bdSMat Martineau { 45808eb200bdSMat Martineau struct hci_chan *hchan = NULL; 45818eb200bdSMat Martineau 45828eb200bdSMat Martineau /* Placeholder - get hci_chan for logical link */ 45838eb200bdSMat Martineau 45848eb200bdSMat Martineau if (hchan) { 45858eb200bdSMat Martineau if (hchan->state == BT_CONNECTED) { 45868eb200bdSMat Martineau /* Logical link is ready to go */ 45878eb200bdSMat Martineau chan->hs_hcon = hchan->conn; 45888eb200bdSMat Martineau chan->hs_hcon->l2cap_data = chan->conn; 45898eb200bdSMat Martineau chan->move_state = L2CAP_MOVE_WAIT_CONFIRM; 45908eb200bdSMat Martineau l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS); 45918eb200bdSMat Martineau 45928eb200bdSMat Martineau l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS); 45938eb200bdSMat Martineau } else { 45948eb200bdSMat Martineau /* Wait for logical link to be ready */ 45958eb200bdSMat Martineau chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM; 45968eb200bdSMat Martineau } 45978eb200bdSMat Martineau } else { 45988eb200bdSMat Martineau /* Logical link not available */ 45998eb200bdSMat Martineau l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_ALLOWED); 46008eb200bdSMat Martineau } 46018eb200bdSMat Martineau } 46028eb200bdSMat Martineau 46038eb200bdSMat Martineau static void l2cap_do_move_cancel(struct l2cap_chan *chan, int result) 46048eb200bdSMat Martineau { 46058eb200bdSMat Martineau if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) { 46068eb200bdSMat Martineau u8 rsp_result; 46078eb200bdSMat Martineau if (result == -EINVAL) 46088eb200bdSMat Martineau rsp_result = L2CAP_MR_BAD_ID; 46098eb200bdSMat Martineau else 46108eb200bdSMat Martineau rsp_result = L2CAP_MR_NOT_ALLOWED; 46118eb200bdSMat Martineau 46128eb200bdSMat Martineau l2cap_send_move_chan_rsp(chan, rsp_result); 46138eb200bdSMat Martineau } 46148eb200bdSMat Martineau 46158eb200bdSMat Martineau chan->move_role = L2CAP_MOVE_ROLE_NONE; 46168eb200bdSMat Martineau chan->move_state = L2CAP_MOVE_STABLE; 46178eb200bdSMat Martineau 46188eb200bdSMat Martineau /* Restart data transmission */ 46198eb200bdSMat Martineau l2cap_ertm_send(chan); 46208eb200bdSMat Martineau } 46218eb200bdSMat Martineau 4622a514b17fSAndrei Emeltchenko /* Invoke with locked chan */ 4623a514b17fSAndrei Emeltchenko void __l2cap_physical_cfm(struct l2cap_chan *chan, int result) 46248eb200bdSMat Martineau { 4625770bfefaSAndrei Emeltchenko u8 local_amp_id = chan->local_amp_id; 4626fffadc08SAndrei Emeltchenko u8 remote_amp_id = chan->remote_amp_id; 4627770bfefaSAndrei Emeltchenko 46288eb200bdSMat Martineau BT_DBG("chan %p, result %d, local_amp_id %d, remote_amp_id %d", 46298eb200bdSMat Martineau chan, result, local_amp_id, remote_amp_id); 46308eb200bdSMat Martineau 46318eb200bdSMat Martineau if (chan->state == BT_DISCONN || chan->state == BT_CLOSED) { 46328eb200bdSMat Martineau l2cap_chan_unlock(chan); 46338eb200bdSMat Martineau return; 46348eb200bdSMat Martineau } 46358eb200bdSMat Martineau 46368eb200bdSMat Martineau if (chan->state != BT_CONNECTED) { 46378eb200bdSMat Martineau l2cap_do_create(chan, result, local_amp_id, remote_amp_id); 46388eb200bdSMat Martineau } else if (result != L2CAP_MR_SUCCESS) { 46398eb200bdSMat Martineau l2cap_do_move_cancel(chan, result); 46408eb200bdSMat Martineau } else { 46418eb200bdSMat Martineau switch (chan->move_role) { 46428eb200bdSMat Martineau case L2CAP_MOVE_ROLE_INITIATOR: 46438eb200bdSMat Martineau l2cap_do_move_initiate(chan, local_amp_id, 46448eb200bdSMat Martineau remote_amp_id); 46458eb200bdSMat Martineau break; 46468eb200bdSMat Martineau case L2CAP_MOVE_ROLE_RESPONDER: 46478eb200bdSMat Martineau l2cap_do_move_respond(chan, result); 46488eb200bdSMat Martineau break; 46498eb200bdSMat Martineau default: 46508eb200bdSMat Martineau l2cap_do_move_cancel(chan, result); 46518eb200bdSMat Martineau break; 46528eb200bdSMat Martineau } 46538eb200bdSMat Martineau } 46548eb200bdSMat Martineau } 46558eb200bdSMat Martineau 46568d5a04a1SMat Martineau static inline int l2cap_move_channel_req(struct l2cap_conn *conn, 4657ad0ac6caSAndrei Emeltchenko struct l2cap_cmd_hdr *cmd, 4658ad0ac6caSAndrei Emeltchenko u16 cmd_len, void *data) 46598d5a04a1SMat Martineau { 46608d5a04a1SMat Martineau struct l2cap_move_chan_req *req = data; 46611500109bSMat Martineau struct l2cap_move_chan_rsp rsp; 466202b0fbb9SMat Martineau struct l2cap_chan *chan; 46638d5a04a1SMat Martineau u16 icid = 0; 46648d5a04a1SMat Martineau u16 result = L2CAP_MR_NOT_ALLOWED; 46658d5a04a1SMat Martineau 46668d5a04a1SMat Martineau if (cmd_len != sizeof(*req)) 46678d5a04a1SMat Martineau return -EPROTO; 46688d5a04a1SMat Martineau 46698d5a04a1SMat Martineau icid = le16_to_cpu(req->icid); 46708d5a04a1SMat Martineau 4671ad0ac6caSAndrei Emeltchenko BT_DBG("icid 0x%4.4x, dest_amp_id %d", icid, req->dest_amp_id); 46728d5a04a1SMat Martineau 46738d5a04a1SMat Martineau if (!enable_hs) 46748d5a04a1SMat Martineau return -EINVAL; 46758d5a04a1SMat Martineau 467602b0fbb9SMat Martineau chan = l2cap_get_chan_by_dcid(conn, icid); 467702b0fbb9SMat Martineau if (!chan) { 46781500109bSMat Martineau rsp.icid = cpu_to_le16(icid); 46791500109bSMat Martineau rsp.result = __constant_cpu_to_le16(L2CAP_MR_NOT_ALLOWED); 46801500109bSMat Martineau l2cap_send_cmd(conn, cmd->ident, L2CAP_MOVE_CHAN_RSP, 46811500109bSMat Martineau sizeof(rsp), &rsp); 468202b0fbb9SMat Martineau return 0; 468302b0fbb9SMat Martineau } 468402b0fbb9SMat Martineau 46851500109bSMat Martineau chan->ident = cmd->ident; 46861500109bSMat Martineau 468702b0fbb9SMat Martineau if (chan->scid < L2CAP_CID_DYN_START || 468802b0fbb9SMat Martineau chan->chan_policy == BT_CHANNEL_POLICY_BREDR_ONLY || 468902b0fbb9SMat Martineau (chan->mode != L2CAP_MODE_ERTM && 469002b0fbb9SMat Martineau chan->mode != L2CAP_MODE_STREAMING)) { 469102b0fbb9SMat Martineau result = L2CAP_MR_NOT_ALLOWED; 469202b0fbb9SMat Martineau goto send_move_response; 469302b0fbb9SMat Martineau } 469402b0fbb9SMat Martineau 469502b0fbb9SMat Martineau if (chan->local_amp_id == req->dest_amp_id) { 469602b0fbb9SMat Martineau result = L2CAP_MR_SAME_ID; 469702b0fbb9SMat Martineau goto send_move_response; 469802b0fbb9SMat Martineau } 469902b0fbb9SMat Martineau 470002b0fbb9SMat Martineau if (req->dest_amp_id) { 470102b0fbb9SMat Martineau struct hci_dev *hdev; 470202b0fbb9SMat Martineau hdev = hci_dev_get(req->dest_amp_id); 470302b0fbb9SMat Martineau if (!hdev || hdev->dev_type != HCI_AMP || 470402b0fbb9SMat Martineau !test_bit(HCI_UP, &hdev->flags)) { 470502b0fbb9SMat Martineau if (hdev) 470602b0fbb9SMat Martineau hci_dev_put(hdev); 470702b0fbb9SMat Martineau 470802b0fbb9SMat Martineau result = L2CAP_MR_BAD_ID; 470902b0fbb9SMat Martineau goto send_move_response; 471002b0fbb9SMat Martineau } 471102b0fbb9SMat Martineau hci_dev_put(hdev); 471202b0fbb9SMat Martineau } 471302b0fbb9SMat Martineau 471402b0fbb9SMat Martineau /* Detect a move collision. Only send a collision response 471502b0fbb9SMat Martineau * if this side has "lost", otherwise proceed with the move. 471602b0fbb9SMat Martineau * The winner has the larger bd_addr. 471702b0fbb9SMat Martineau */ 471802b0fbb9SMat Martineau if ((__chan_is_moving(chan) || 471902b0fbb9SMat Martineau chan->move_role != L2CAP_MOVE_ROLE_NONE) && 472002b0fbb9SMat Martineau bacmp(conn->src, conn->dst) > 0) { 472102b0fbb9SMat Martineau result = L2CAP_MR_COLLISION; 472202b0fbb9SMat Martineau goto send_move_response; 472302b0fbb9SMat Martineau } 472402b0fbb9SMat Martineau 472502b0fbb9SMat Martineau chan->move_role = L2CAP_MOVE_ROLE_RESPONDER; 472602b0fbb9SMat Martineau l2cap_move_setup(chan); 472702b0fbb9SMat Martineau chan->move_id = req->dest_amp_id; 472802b0fbb9SMat Martineau icid = chan->dcid; 472902b0fbb9SMat Martineau 473002b0fbb9SMat Martineau if (!req->dest_amp_id) { 473102b0fbb9SMat Martineau /* Moving to BR/EDR */ 473202b0fbb9SMat Martineau if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { 473302b0fbb9SMat Martineau chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY; 473402b0fbb9SMat Martineau result = L2CAP_MR_PEND; 473502b0fbb9SMat Martineau } else { 473602b0fbb9SMat Martineau chan->move_state = L2CAP_MOVE_WAIT_CONFIRM; 473702b0fbb9SMat Martineau result = L2CAP_MR_SUCCESS; 473802b0fbb9SMat Martineau } 473902b0fbb9SMat Martineau } else { 474002b0fbb9SMat Martineau chan->move_state = L2CAP_MOVE_WAIT_PREPARE; 474102b0fbb9SMat Martineau /* Placeholder - uncomment when amp functions are available */ 474202b0fbb9SMat Martineau /*amp_accept_physical(chan, req->dest_amp_id);*/ 474302b0fbb9SMat Martineau result = L2CAP_MR_PEND; 474402b0fbb9SMat Martineau } 474502b0fbb9SMat Martineau 474602b0fbb9SMat Martineau send_move_response: 47471500109bSMat Martineau l2cap_send_move_chan_rsp(chan, result); 47488d5a04a1SMat Martineau 474902b0fbb9SMat Martineau l2cap_chan_unlock(chan); 475002b0fbb9SMat Martineau 47518d5a04a1SMat Martineau return 0; 47528d5a04a1SMat Martineau } 47538d5a04a1SMat Martineau 47545b155ef9SMat Martineau static void l2cap_move_continue(struct l2cap_conn *conn, u16 icid, u16 result) 47555b155ef9SMat Martineau { 47565b155ef9SMat Martineau struct l2cap_chan *chan; 47575b155ef9SMat Martineau struct hci_chan *hchan = NULL; 47585b155ef9SMat Martineau 47595b155ef9SMat Martineau chan = l2cap_get_chan_by_scid(conn, icid); 47605b155ef9SMat Martineau if (!chan) { 47615b155ef9SMat Martineau l2cap_send_move_chan_cfm_icid(conn, icid); 47625b155ef9SMat Martineau return; 47635b155ef9SMat Martineau } 47645b155ef9SMat Martineau 47655b155ef9SMat Martineau __clear_chan_timer(chan); 47665b155ef9SMat Martineau if (result == L2CAP_MR_PEND) 47675b155ef9SMat Martineau __set_chan_timer(chan, L2CAP_MOVE_ERTX_TIMEOUT); 47685b155ef9SMat Martineau 47695b155ef9SMat Martineau switch (chan->move_state) { 47705b155ef9SMat Martineau case L2CAP_MOVE_WAIT_LOGICAL_COMP: 47715b155ef9SMat Martineau /* Move confirm will be sent when logical link 47725b155ef9SMat Martineau * is complete. 47735b155ef9SMat Martineau */ 47745b155ef9SMat Martineau chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM; 47755b155ef9SMat Martineau break; 47765b155ef9SMat Martineau case L2CAP_MOVE_WAIT_RSP_SUCCESS: 47775b155ef9SMat Martineau if (result == L2CAP_MR_PEND) { 47785b155ef9SMat Martineau break; 47795b155ef9SMat Martineau } else if (test_bit(CONN_LOCAL_BUSY, 47805b155ef9SMat Martineau &chan->conn_state)) { 47815b155ef9SMat Martineau chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY; 47825b155ef9SMat Martineau } else { 47835b155ef9SMat Martineau /* Logical link is up or moving to BR/EDR, 47845b155ef9SMat Martineau * proceed with move 47855b155ef9SMat Martineau */ 47865b155ef9SMat Martineau chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP; 47875b155ef9SMat Martineau l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED); 47885b155ef9SMat Martineau } 47895b155ef9SMat Martineau break; 47905b155ef9SMat Martineau case L2CAP_MOVE_WAIT_RSP: 47915b155ef9SMat Martineau /* Moving to AMP */ 47925b155ef9SMat Martineau if (result == L2CAP_MR_SUCCESS) { 47935b155ef9SMat Martineau /* Remote is ready, send confirm immediately 47945b155ef9SMat Martineau * after logical link is ready 47955b155ef9SMat Martineau */ 47965b155ef9SMat Martineau chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM; 47975b155ef9SMat Martineau } else { 47985b155ef9SMat Martineau /* Both logical link and move success 47995b155ef9SMat Martineau * are required to confirm 48005b155ef9SMat Martineau */ 48015b155ef9SMat Martineau chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_COMP; 48025b155ef9SMat Martineau } 48035b155ef9SMat Martineau 48045b155ef9SMat Martineau /* Placeholder - get hci_chan for logical link */ 48055b155ef9SMat Martineau if (!hchan) { 48065b155ef9SMat Martineau /* Logical link not available */ 48075b155ef9SMat Martineau l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); 48085b155ef9SMat Martineau break; 48095b155ef9SMat Martineau } 48105b155ef9SMat Martineau 48115b155ef9SMat Martineau /* If the logical link is not yet connected, do not 48125b155ef9SMat Martineau * send confirmation. 48135b155ef9SMat Martineau */ 48145b155ef9SMat Martineau if (hchan->state != BT_CONNECTED) 48155b155ef9SMat Martineau break; 48165b155ef9SMat Martineau 48175b155ef9SMat Martineau /* Logical link is already ready to go */ 48185b155ef9SMat Martineau 48195b155ef9SMat Martineau chan->hs_hcon = hchan->conn; 48205b155ef9SMat Martineau chan->hs_hcon->l2cap_data = chan->conn; 48215b155ef9SMat Martineau 48225b155ef9SMat Martineau if (result == L2CAP_MR_SUCCESS) { 48235b155ef9SMat Martineau /* Can confirm now */ 48245b155ef9SMat Martineau l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED); 48255b155ef9SMat Martineau } else { 48265b155ef9SMat Martineau /* Now only need move success 48275b155ef9SMat Martineau * to confirm 48285b155ef9SMat Martineau */ 48295b155ef9SMat Martineau chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS; 48305b155ef9SMat Martineau } 48315b155ef9SMat Martineau 48325b155ef9SMat Martineau l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS); 48335b155ef9SMat Martineau break; 48345b155ef9SMat Martineau default: 48355b155ef9SMat Martineau /* Any other amp move state means the move failed. */ 48365b155ef9SMat Martineau chan->move_id = chan->local_amp_id; 48375b155ef9SMat Martineau l2cap_move_done(chan); 48385b155ef9SMat Martineau l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); 48395b155ef9SMat Martineau } 48405b155ef9SMat Martineau 48415b155ef9SMat Martineau l2cap_chan_unlock(chan); 48425b155ef9SMat Martineau } 48435b155ef9SMat Martineau 48445b155ef9SMat Martineau static void l2cap_move_fail(struct l2cap_conn *conn, u8 ident, u16 icid, 48455b155ef9SMat Martineau u16 result) 48465b155ef9SMat Martineau { 48475b155ef9SMat Martineau struct l2cap_chan *chan; 48485b155ef9SMat Martineau 48495b155ef9SMat Martineau chan = l2cap_get_chan_by_ident(conn, ident); 48505b155ef9SMat Martineau if (!chan) { 48515b155ef9SMat Martineau /* Could not locate channel, icid is best guess */ 48525b155ef9SMat Martineau l2cap_send_move_chan_cfm_icid(conn, icid); 48535b155ef9SMat Martineau return; 48545b155ef9SMat Martineau } 48555b155ef9SMat Martineau 48565b155ef9SMat Martineau __clear_chan_timer(chan); 48575b155ef9SMat Martineau 48585b155ef9SMat Martineau if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) { 48595b155ef9SMat Martineau if (result == L2CAP_MR_COLLISION) { 48605b155ef9SMat Martineau chan->move_role = L2CAP_MOVE_ROLE_RESPONDER; 48615b155ef9SMat Martineau } else { 48625b155ef9SMat Martineau /* Cleanup - cancel move */ 48635b155ef9SMat Martineau chan->move_id = chan->local_amp_id; 48645b155ef9SMat Martineau l2cap_move_done(chan); 48655b155ef9SMat Martineau } 48665b155ef9SMat Martineau } 48675b155ef9SMat Martineau 48685b155ef9SMat Martineau l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); 48695b155ef9SMat Martineau 48705b155ef9SMat Martineau l2cap_chan_unlock(chan); 48715b155ef9SMat Martineau } 48725b155ef9SMat Martineau 48735b155ef9SMat Martineau static int l2cap_move_channel_rsp(struct l2cap_conn *conn, 4874ad0ac6caSAndrei Emeltchenko struct l2cap_cmd_hdr *cmd, 4875ad0ac6caSAndrei Emeltchenko u16 cmd_len, void *data) 48768d5a04a1SMat Martineau { 48778d5a04a1SMat Martineau struct l2cap_move_chan_rsp *rsp = data; 48788d5a04a1SMat Martineau u16 icid, result; 48798d5a04a1SMat Martineau 48808d5a04a1SMat Martineau if (cmd_len != sizeof(*rsp)) 48818d5a04a1SMat Martineau return -EPROTO; 48828d5a04a1SMat Martineau 48838d5a04a1SMat Martineau icid = le16_to_cpu(rsp->icid); 48848d5a04a1SMat Martineau result = le16_to_cpu(rsp->result); 48858d5a04a1SMat Martineau 4886ad0ac6caSAndrei Emeltchenko BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); 48878d5a04a1SMat Martineau 48885b155ef9SMat Martineau if (result == L2CAP_MR_SUCCESS || result == L2CAP_MR_PEND) 48895b155ef9SMat Martineau l2cap_move_continue(conn, icid, result); 48905b155ef9SMat Martineau else 48915b155ef9SMat Martineau l2cap_move_fail(conn, cmd->ident, icid, result); 48928d5a04a1SMat Martineau 48938d5a04a1SMat Martineau return 0; 48948d5a04a1SMat Martineau } 48958d5a04a1SMat Martineau 48965f3847a4SMat Martineau static int l2cap_move_channel_confirm(struct l2cap_conn *conn, 4897ad0ac6caSAndrei Emeltchenko struct l2cap_cmd_hdr *cmd, 4898ad0ac6caSAndrei Emeltchenko u16 cmd_len, void *data) 48998d5a04a1SMat Martineau { 49008d5a04a1SMat Martineau struct l2cap_move_chan_cfm *cfm = data; 49015f3847a4SMat Martineau struct l2cap_chan *chan; 49028d5a04a1SMat Martineau u16 icid, result; 49038d5a04a1SMat Martineau 49048d5a04a1SMat Martineau if (cmd_len != sizeof(*cfm)) 49058d5a04a1SMat Martineau return -EPROTO; 49068d5a04a1SMat Martineau 49078d5a04a1SMat Martineau icid = le16_to_cpu(cfm->icid); 49088d5a04a1SMat Martineau result = le16_to_cpu(cfm->result); 49098d5a04a1SMat Martineau 4910ad0ac6caSAndrei Emeltchenko BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); 49118d5a04a1SMat Martineau 49125f3847a4SMat Martineau chan = l2cap_get_chan_by_dcid(conn, icid); 49135f3847a4SMat Martineau if (!chan) { 49145f3847a4SMat Martineau /* Spec requires a response even if the icid was not found */ 49158d5a04a1SMat Martineau l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); 49165f3847a4SMat Martineau return 0; 49175f3847a4SMat Martineau } 49185f3847a4SMat Martineau 49195f3847a4SMat Martineau if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM) { 49205f3847a4SMat Martineau if (result == L2CAP_MC_CONFIRMED) { 49215f3847a4SMat Martineau chan->local_amp_id = chan->move_id; 49225f3847a4SMat Martineau if (!chan->local_amp_id) 49235f3847a4SMat Martineau __release_logical_link(chan); 49245f3847a4SMat Martineau } else { 49255f3847a4SMat Martineau chan->move_id = chan->local_amp_id; 49265f3847a4SMat Martineau } 49275f3847a4SMat Martineau 49285f3847a4SMat Martineau l2cap_move_done(chan); 49295f3847a4SMat Martineau } 49305f3847a4SMat Martineau 49315f3847a4SMat Martineau l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); 49325f3847a4SMat Martineau 49335f3847a4SMat Martineau l2cap_chan_unlock(chan); 49348d5a04a1SMat Martineau 49358d5a04a1SMat Martineau return 0; 49368d5a04a1SMat Martineau } 49378d5a04a1SMat Martineau 49388d5a04a1SMat Martineau static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn, 4939ad0ac6caSAndrei Emeltchenko struct l2cap_cmd_hdr *cmd, 4940ad0ac6caSAndrei Emeltchenko u16 cmd_len, void *data) 49418d5a04a1SMat Martineau { 49428d5a04a1SMat Martineau struct l2cap_move_chan_cfm_rsp *rsp = data; 49433fd71a0aSMat Martineau struct l2cap_chan *chan; 49448d5a04a1SMat Martineau u16 icid; 49458d5a04a1SMat Martineau 49468d5a04a1SMat Martineau if (cmd_len != sizeof(*rsp)) 49478d5a04a1SMat Martineau return -EPROTO; 49488d5a04a1SMat Martineau 49498d5a04a1SMat Martineau icid = le16_to_cpu(rsp->icid); 49508d5a04a1SMat Martineau 4951ad0ac6caSAndrei Emeltchenko BT_DBG("icid 0x%4.4x", icid); 49528d5a04a1SMat Martineau 49533fd71a0aSMat Martineau chan = l2cap_get_chan_by_scid(conn, icid); 49543fd71a0aSMat Martineau if (!chan) 49553fd71a0aSMat Martineau return 0; 49563fd71a0aSMat Martineau 49573fd71a0aSMat Martineau __clear_chan_timer(chan); 49583fd71a0aSMat Martineau 49593fd71a0aSMat Martineau if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM_RSP) { 49603fd71a0aSMat Martineau chan->local_amp_id = chan->move_id; 49613fd71a0aSMat Martineau 49623fd71a0aSMat Martineau if (!chan->local_amp_id && chan->hs_hchan) 49633fd71a0aSMat Martineau __release_logical_link(chan); 49643fd71a0aSMat Martineau 49653fd71a0aSMat Martineau l2cap_move_done(chan); 49663fd71a0aSMat Martineau } 49673fd71a0aSMat Martineau 49683fd71a0aSMat Martineau l2cap_chan_unlock(chan); 49693fd71a0aSMat Martineau 49708d5a04a1SMat Martineau return 0; 49718d5a04a1SMat Martineau } 49728d5a04a1SMat Martineau 4973e2174ca4SGustavo F. Padovan static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency, 4974de73115aSClaudio Takahasi u16 to_multiplier) 4975de73115aSClaudio Takahasi { 4976de73115aSClaudio Takahasi u16 max_latency; 4977de73115aSClaudio Takahasi 4978de73115aSClaudio Takahasi if (min > max || min < 6 || max > 3200) 4979de73115aSClaudio Takahasi return -EINVAL; 4980de73115aSClaudio Takahasi 4981de73115aSClaudio Takahasi if (to_multiplier < 10 || to_multiplier > 3200) 4982de73115aSClaudio Takahasi return -EINVAL; 4983de73115aSClaudio Takahasi 4984de73115aSClaudio Takahasi if (max >= to_multiplier * 8) 4985de73115aSClaudio Takahasi return -EINVAL; 4986de73115aSClaudio Takahasi 4987de73115aSClaudio Takahasi max_latency = (to_multiplier * 8 / max) - 1; 4988de73115aSClaudio Takahasi if (latency > 499 || latency > max_latency) 4989de73115aSClaudio Takahasi return -EINVAL; 4990de73115aSClaudio Takahasi 4991de73115aSClaudio Takahasi return 0; 4992de73115aSClaudio Takahasi } 4993de73115aSClaudio Takahasi 4994de73115aSClaudio Takahasi static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, 49952d792818SGustavo Padovan struct l2cap_cmd_hdr *cmd, 49962d792818SGustavo Padovan u8 *data) 4997de73115aSClaudio Takahasi { 4998de73115aSClaudio Takahasi struct hci_conn *hcon = conn->hcon; 4999de73115aSClaudio Takahasi struct l2cap_conn_param_update_req *req; 5000de73115aSClaudio Takahasi struct l2cap_conn_param_update_rsp rsp; 5001de73115aSClaudio Takahasi u16 min, max, latency, to_multiplier, cmd_len; 50022ce603ebSClaudio Takahasi int err; 5003de73115aSClaudio Takahasi 5004de73115aSClaudio Takahasi if (!(hcon->link_mode & HCI_LM_MASTER)) 5005de73115aSClaudio Takahasi return -EINVAL; 5006de73115aSClaudio Takahasi 5007de73115aSClaudio Takahasi cmd_len = __le16_to_cpu(cmd->len); 5008de73115aSClaudio Takahasi if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) 5009de73115aSClaudio Takahasi return -EPROTO; 5010de73115aSClaudio Takahasi 5011de73115aSClaudio Takahasi req = (struct l2cap_conn_param_update_req *) data; 5012de73115aSClaudio Takahasi min = __le16_to_cpu(req->min); 5013de73115aSClaudio Takahasi max = __le16_to_cpu(req->max); 5014de73115aSClaudio Takahasi latency = __le16_to_cpu(req->latency); 5015de73115aSClaudio Takahasi to_multiplier = __le16_to_cpu(req->to_multiplier); 5016de73115aSClaudio Takahasi 5017de73115aSClaudio Takahasi BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", 5018de73115aSClaudio Takahasi min, max, latency, to_multiplier); 5019de73115aSClaudio Takahasi 5020de73115aSClaudio Takahasi memset(&rsp, 0, sizeof(rsp)); 50212ce603ebSClaudio Takahasi 50222ce603ebSClaudio Takahasi err = l2cap_check_conn_param(min, max, latency, to_multiplier); 50232ce603ebSClaudio Takahasi if (err) 5024ac73498cSAndrei Emeltchenko rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); 5025de73115aSClaudio Takahasi else 5026ac73498cSAndrei Emeltchenko rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); 5027de73115aSClaudio Takahasi 5028de73115aSClaudio Takahasi l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, 5029de73115aSClaudio Takahasi sizeof(rsp), &rsp); 5030de73115aSClaudio Takahasi 50312ce603ebSClaudio Takahasi if (!err) 50322ce603ebSClaudio Takahasi hci_le_conn_update(hcon, min, max, latency, to_multiplier); 50332ce603ebSClaudio Takahasi 5034de73115aSClaudio Takahasi return 0; 5035de73115aSClaudio Takahasi } 5036de73115aSClaudio Takahasi 50373300d9a9SClaudio Takahasi static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, 50382d792818SGustavo Padovan struct l2cap_cmd_hdr *cmd, u16 cmd_len, 50392d792818SGustavo Padovan u8 *data) 50403300d9a9SClaudio Takahasi { 50413300d9a9SClaudio Takahasi int err = 0; 50423300d9a9SClaudio Takahasi 50433300d9a9SClaudio Takahasi switch (cmd->code) { 50443300d9a9SClaudio Takahasi case L2CAP_COMMAND_REJ: 50453300d9a9SClaudio Takahasi l2cap_command_rej(conn, cmd, data); 50463300d9a9SClaudio Takahasi break; 50473300d9a9SClaudio Takahasi 50483300d9a9SClaudio Takahasi case L2CAP_CONN_REQ: 50493300d9a9SClaudio Takahasi err = l2cap_connect_req(conn, cmd, data); 50503300d9a9SClaudio Takahasi break; 50513300d9a9SClaudio Takahasi 50523300d9a9SClaudio Takahasi case L2CAP_CONN_RSP: 5053f5a2598dSMat Martineau case L2CAP_CREATE_CHAN_RSP: 50545909cf30SMat Martineau err = l2cap_connect_create_rsp(conn, cmd, data); 50553300d9a9SClaudio Takahasi break; 50563300d9a9SClaudio Takahasi 50573300d9a9SClaudio Takahasi case L2CAP_CONF_REQ: 50583300d9a9SClaudio Takahasi err = l2cap_config_req(conn, cmd, cmd_len, data); 50593300d9a9SClaudio Takahasi break; 50603300d9a9SClaudio Takahasi 50613300d9a9SClaudio Takahasi case L2CAP_CONF_RSP: 50623300d9a9SClaudio Takahasi err = l2cap_config_rsp(conn, cmd, data); 50633300d9a9SClaudio Takahasi break; 50643300d9a9SClaudio Takahasi 50653300d9a9SClaudio Takahasi case L2CAP_DISCONN_REQ: 50663300d9a9SClaudio Takahasi err = l2cap_disconnect_req(conn, cmd, data); 50673300d9a9SClaudio Takahasi break; 50683300d9a9SClaudio Takahasi 50693300d9a9SClaudio Takahasi case L2CAP_DISCONN_RSP: 50703300d9a9SClaudio Takahasi err = l2cap_disconnect_rsp(conn, cmd, data); 50713300d9a9SClaudio Takahasi break; 50723300d9a9SClaudio Takahasi 50733300d9a9SClaudio Takahasi case L2CAP_ECHO_REQ: 50743300d9a9SClaudio Takahasi l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); 50753300d9a9SClaudio Takahasi break; 50763300d9a9SClaudio Takahasi 50773300d9a9SClaudio Takahasi case L2CAP_ECHO_RSP: 50783300d9a9SClaudio Takahasi break; 50793300d9a9SClaudio Takahasi 50803300d9a9SClaudio Takahasi case L2CAP_INFO_REQ: 50813300d9a9SClaudio Takahasi err = l2cap_information_req(conn, cmd, data); 50823300d9a9SClaudio Takahasi break; 50833300d9a9SClaudio Takahasi 50843300d9a9SClaudio Takahasi case L2CAP_INFO_RSP: 50853300d9a9SClaudio Takahasi err = l2cap_information_rsp(conn, cmd, data); 50863300d9a9SClaudio Takahasi break; 50873300d9a9SClaudio Takahasi 5088f94ff6ffSMat Martineau case L2CAP_CREATE_CHAN_REQ: 5089f94ff6ffSMat Martineau err = l2cap_create_channel_req(conn, cmd, cmd_len, data); 5090f94ff6ffSMat Martineau break; 5091f94ff6ffSMat Martineau 50928d5a04a1SMat Martineau case L2CAP_MOVE_CHAN_REQ: 50938d5a04a1SMat Martineau err = l2cap_move_channel_req(conn, cmd, cmd_len, data); 50948d5a04a1SMat Martineau break; 50958d5a04a1SMat Martineau 50968d5a04a1SMat Martineau case L2CAP_MOVE_CHAN_RSP: 50978d5a04a1SMat Martineau err = l2cap_move_channel_rsp(conn, cmd, cmd_len, data); 50988d5a04a1SMat Martineau break; 50998d5a04a1SMat Martineau 51008d5a04a1SMat Martineau case L2CAP_MOVE_CHAN_CFM: 51018d5a04a1SMat Martineau err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data); 51028d5a04a1SMat Martineau break; 51038d5a04a1SMat Martineau 51048d5a04a1SMat Martineau case L2CAP_MOVE_CHAN_CFM_RSP: 51058d5a04a1SMat Martineau err = l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data); 51068d5a04a1SMat Martineau break; 51078d5a04a1SMat Martineau 51083300d9a9SClaudio Takahasi default: 51093300d9a9SClaudio Takahasi BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); 51103300d9a9SClaudio Takahasi err = -EINVAL; 51113300d9a9SClaudio Takahasi break; 51123300d9a9SClaudio Takahasi } 51133300d9a9SClaudio Takahasi 51143300d9a9SClaudio Takahasi return err; 51153300d9a9SClaudio Takahasi } 51163300d9a9SClaudio Takahasi 51173300d9a9SClaudio Takahasi static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, 51183300d9a9SClaudio Takahasi struct l2cap_cmd_hdr *cmd, u8 *data) 51193300d9a9SClaudio Takahasi { 51203300d9a9SClaudio Takahasi switch (cmd->code) { 51213300d9a9SClaudio Takahasi case L2CAP_COMMAND_REJ: 51223300d9a9SClaudio Takahasi return 0; 51233300d9a9SClaudio Takahasi 51243300d9a9SClaudio Takahasi case L2CAP_CONN_PARAM_UPDATE_REQ: 5125de73115aSClaudio Takahasi return l2cap_conn_param_update_req(conn, cmd, data); 51263300d9a9SClaudio Takahasi 51273300d9a9SClaudio Takahasi case L2CAP_CONN_PARAM_UPDATE_RSP: 51283300d9a9SClaudio Takahasi return 0; 51293300d9a9SClaudio Takahasi 51303300d9a9SClaudio Takahasi default: 51313300d9a9SClaudio Takahasi BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); 51323300d9a9SClaudio Takahasi return -EINVAL; 51333300d9a9SClaudio Takahasi } 51343300d9a9SClaudio Takahasi } 51353300d9a9SClaudio Takahasi 51363300d9a9SClaudio Takahasi static inline void l2cap_sig_channel(struct l2cap_conn *conn, 51373300d9a9SClaudio Takahasi struct sk_buff *skb) 51380a708f8fSGustavo F. Padovan { 51390a708f8fSGustavo F. Padovan u8 *data = skb->data; 51400a708f8fSGustavo F. Padovan int len = skb->len; 51410a708f8fSGustavo F. Padovan struct l2cap_cmd_hdr cmd; 51423300d9a9SClaudio Takahasi int err; 51430a708f8fSGustavo F. Padovan 51440a708f8fSGustavo F. Padovan l2cap_raw_recv(conn, skb); 51450a708f8fSGustavo F. Padovan 51460a708f8fSGustavo F. Padovan while (len >= L2CAP_CMD_HDR_SIZE) { 51470a708f8fSGustavo F. Padovan u16 cmd_len; 51480a708f8fSGustavo F. Padovan memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); 51490a708f8fSGustavo F. Padovan data += L2CAP_CMD_HDR_SIZE; 51500a708f8fSGustavo F. Padovan len -= L2CAP_CMD_HDR_SIZE; 51510a708f8fSGustavo F. Padovan 51520a708f8fSGustavo F. Padovan cmd_len = le16_to_cpu(cmd.len); 51530a708f8fSGustavo F. Padovan 51542d792818SGustavo Padovan BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, 51552d792818SGustavo Padovan cmd.ident); 51560a708f8fSGustavo F. Padovan 51570a708f8fSGustavo F. Padovan if (cmd_len > len || !cmd.ident) { 51580a708f8fSGustavo F. Padovan BT_DBG("corrupted command"); 51590a708f8fSGustavo F. Padovan break; 51600a708f8fSGustavo F. Padovan } 51610a708f8fSGustavo F. Padovan 51623300d9a9SClaudio Takahasi if (conn->hcon->type == LE_LINK) 51633300d9a9SClaudio Takahasi err = l2cap_le_sig_cmd(conn, &cmd, data); 51643300d9a9SClaudio Takahasi else 51653300d9a9SClaudio Takahasi err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); 51660a708f8fSGustavo F. Padovan 51670a708f8fSGustavo F. Padovan if (err) { 5168e2fd318eSIlia Kolomisnky struct l2cap_cmd_rej_unk rej; 51692c6d1a2eSGustavo F. Padovan 51702c6d1a2eSGustavo F. Padovan BT_ERR("Wrong link type (%d)", err); 51710a708f8fSGustavo F. Padovan 51720a708f8fSGustavo F. Padovan /* FIXME: Map err to a valid reason */ 5173ac73498cSAndrei Emeltchenko rej.reason = __constant_cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); 51742d792818SGustavo Padovan l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, 51752d792818SGustavo Padovan sizeof(rej), &rej); 51760a708f8fSGustavo F. Padovan } 51770a708f8fSGustavo F. Padovan 51780a708f8fSGustavo F. Padovan data += cmd_len; 51790a708f8fSGustavo F. Padovan len -= cmd_len; 51800a708f8fSGustavo F. Padovan } 51810a708f8fSGustavo F. Padovan 51820a708f8fSGustavo F. Padovan kfree_skb(skb); 51830a708f8fSGustavo F. Padovan } 51840a708f8fSGustavo F. Padovan 518547d1ec61SGustavo F. Padovan static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb) 51860a708f8fSGustavo F. Padovan { 51870a708f8fSGustavo F. Padovan u16 our_fcs, rcv_fcs; 5188e4ca6d98SAndrei Emeltchenko int hdr_size; 5189e4ca6d98SAndrei Emeltchenko 5190e4ca6d98SAndrei Emeltchenko if (test_bit(FLAG_EXT_CTRL, &chan->flags)) 5191e4ca6d98SAndrei Emeltchenko hdr_size = L2CAP_EXT_HDR_SIZE; 5192e4ca6d98SAndrei Emeltchenko else 5193e4ca6d98SAndrei Emeltchenko hdr_size = L2CAP_ENH_HDR_SIZE; 51940a708f8fSGustavo F. Padovan 519547d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) { 519603a51213SAndrei Emeltchenko skb_trim(skb, skb->len - L2CAP_FCS_SIZE); 51970a708f8fSGustavo F. Padovan rcv_fcs = get_unaligned_le16(skb->data + skb->len); 51980a708f8fSGustavo F. Padovan our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); 51990a708f8fSGustavo F. Padovan 52000a708f8fSGustavo F. Padovan if (our_fcs != rcv_fcs) 52010a708f8fSGustavo F. Padovan return -EBADMSG; 52020a708f8fSGustavo F. Padovan } 52030a708f8fSGustavo F. Padovan return 0; 52040a708f8fSGustavo F. Padovan } 52050a708f8fSGustavo F. Padovan 52066ea00485SMat Martineau static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) 52070a708f8fSGustavo F. Padovan { 5208e31f7633SMat Martineau struct l2cap_ctrl control; 52090a708f8fSGustavo F. Padovan 5210e31f7633SMat Martineau BT_DBG("chan %p", chan); 52110a708f8fSGustavo F. Padovan 5212e31f7633SMat Martineau memset(&control, 0, sizeof(control)); 5213e31f7633SMat Martineau control.sframe = 1; 5214e31f7633SMat Martineau control.final = 1; 5215e31f7633SMat Martineau control.reqseq = chan->buffer_seq; 5216e31f7633SMat Martineau set_bit(CONN_SEND_FBIT, &chan->conn_state); 52170a708f8fSGustavo F. Padovan 5218e2ab4353SGustavo F. Padovan if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { 5219e31f7633SMat Martineau control.super = L2CAP_SUPER_RNR; 5220e31f7633SMat Martineau l2cap_send_sframe(chan, &control); 52210a708f8fSGustavo F. Padovan } 52220a708f8fSGustavo F. Padovan 5223e31f7633SMat Martineau if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) && 5224e31f7633SMat Martineau chan->unacked_frames > 0) 5225e31f7633SMat Martineau __set_retrans_timer(chan); 52260a708f8fSGustavo F. Padovan 5227e31f7633SMat Martineau /* Send pending iframes */ 5228525cd185SGustavo F. Padovan l2cap_ertm_send(chan); 52290a708f8fSGustavo F. Padovan 5230e2ab4353SGustavo F. Padovan if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && 5231e31f7633SMat Martineau test_bit(CONN_SEND_FBIT, &chan->conn_state)) { 5232e31f7633SMat Martineau /* F-bit wasn't sent in an s-frame or i-frame yet, so 5233e31f7633SMat Martineau * send it now. 5234e31f7633SMat Martineau */ 5235e31f7633SMat Martineau control.super = L2CAP_SUPER_RR; 5236e31f7633SMat Martineau l2cap_send_sframe(chan, &control); 52370a708f8fSGustavo F. Padovan } 52380a708f8fSGustavo F. Padovan } 52390a708f8fSGustavo F. Padovan 52402d792818SGustavo Padovan static void append_skb_frag(struct sk_buff *skb, struct sk_buff *new_frag, 52412d792818SGustavo Padovan struct sk_buff **last_frag) 52420a708f8fSGustavo F. Padovan { 524384084a31SMat Martineau /* skb->len reflects data in skb as well as all fragments 524484084a31SMat Martineau * skb->data_len reflects only data in fragments 524584084a31SMat Martineau */ 524684084a31SMat Martineau if (!skb_has_frag_list(skb)) 524784084a31SMat Martineau skb_shinfo(skb)->frag_list = new_frag; 524884084a31SMat Martineau 524984084a31SMat Martineau new_frag->next = NULL; 525084084a31SMat Martineau 525184084a31SMat Martineau (*last_frag)->next = new_frag; 525284084a31SMat Martineau *last_frag = new_frag; 525384084a31SMat Martineau 525484084a31SMat Martineau skb->len += new_frag->len; 525584084a31SMat Martineau skb->data_len += new_frag->len; 525684084a31SMat Martineau skb->truesize += new_frag->truesize; 525784084a31SMat Martineau } 525884084a31SMat Martineau 52594b51dae9SMat Martineau static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb, 52604b51dae9SMat Martineau struct l2cap_ctrl *control) 526184084a31SMat Martineau { 526284084a31SMat Martineau int err = -EINVAL; 52630a708f8fSGustavo F. Padovan 52644b51dae9SMat Martineau switch (control->sar) { 52657e0ef6eeSAndrei Emeltchenko case L2CAP_SAR_UNSEGMENTED: 526684084a31SMat Martineau if (chan->sdu) 526784084a31SMat Martineau break; 52680a708f8fSGustavo F. Padovan 526980b98027SGustavo Padovan err = chan->ops->recv(chan, skb); 527084084a31SMat Martineau break; 52710a708f8fSGustavo F. Padovan 52727e0ef6eeSAndrei Emeltchenko case L2CAP_SAR_START: 527384084a31SMat Martineau if (chan->sdu) 527484084a31SMat Martineau break; 52750a708f8fSGustavo F. Padovan 52766f61fd47SGustavo F. Padovan chan->sdu_len = get_unaligned_le16(skb->data); 527703a51213SAndrei Emeltchenko skb_pull(skb, L2CAP_SDULEN_SIZE); 52780a708f8fSGustavo F. Padovan 527984084a31SMat Martineau if (chan->sdu_len > chan->imtu) { 528084084a31SMat Martineau err = -EMSGSIZE; 528184084a31SMat Martineau break; 528284084a31SMat Martineau } 52830a708f8fSGustavo F. Padovan 528484084a31SMat Martineau if (skb->len >= chan->sdu_len) 528584084a31SMat Martineau break; 528684084a31SMat Martineau 528784084a31SMat Martineau chan->sdu = skb; 528884084a31SMat Martineau chan->sdu_last_frag = skb; 528984084a31SMat Martineau 529084084a31SMat Martineau skb = NULL; 529184084a31SMat Martineau err = 0; 52920a708f8fSGustavo F. Padovan break; 52930a708f8fSGustavo F. Padovan 52947e0ef6eeSAndrei Emeltchenko case L2CAP_SAR_CONTINUE: 52956f61fd47SGustavo F. Padovan if (!chan->sdu) 529684084a31SMat Martineau break; 52970a708f8fSGustavo F. Padovan 529884084a31SMat Martineau append_skb_frag(chan->sdu, skb, 529984084a31SMat Martineau &chan->sdu_last_frag); 530084084a31SMat Martineau skb = NULL; 53010a708f8fSGustavo F. Padovan 530284084a31SMat Martineau if (chan->sdu->len >= chan->sdu_len) 530384084a31SMat Martineau break; 53040a708f8fSGustavo F. Padovan 530584084a31SMat Martineau err = 0; 53060a708f8fSGustavo F. Padovan break; 53070a708f8fSGustavo F. Padovan 53087e0ef6eeSAndrei Emeltchenko case L2CAP_SAR_END: 53096f61fd47SGustavo F. Padovan if (!chan->sdu) 531084084a31SMat Martineau break; 53110a708f8fSGustavo F. Padovan 531284084a31SMat Martineau append_skb_frag(chan->sdu, skb, 531384084a31SMat Martineau &chan->sdu_last_frag); 531484084a31SMat Martineau skb = NULL; 53150a708f8fSGustavo F. Padovan 531684084a31SMat Martineau if (chan->sdu->len != chan->sdu_len) 531784084a31SMat Martineau break; 53180a708f8fSGustavo F. Padovan 531980b98027SGustavo Padovan err = chan->ops->recv(chan, chan->sdu); 53200a708f8fSGustavo F. Padovan 532184084a31SMat Martineau if (!err) { 532284084a31SMat Martineau /* Reassembly complete */ 532384084a31SMat Martineau chan->sdu = NULL; 532484084a31SMat Martineau chan->sdu_last_frag = NULL; 532584084a31SMat Martineau chan->sdu_len = 0; 53260a708f8fSGustavo F. Padovan } 53270a708f8fSGustavo F. Padovan break; 53280a708f8fSGustavo F. Padovan } 53290a708f8fSGustavo F. Padovan 533084084a31SMat Martineau if (err) { 53310a708f8fSGustavo F. Padovan kfree_skb(skb); 53326f61fd47SGustavo F. Padovan kfree_skb(chan->sdu); 53336f61fd47SGustavo F. Padovan chan->sdu = NULL; 533484084a31SMat Martineau chan->sdu_last_frag = NULL; 533584084a31SMat Martineau chan->sdu_len = 0; 533684084a31SMat Martineau } 53370a708f8fSGustavo F. Padovan 533884084a31SMat Martineau return err; 53390a708f8fSGustavo F. Padovan } 53400a708f8fSGustavo F. Padovan 534132b32735SMat Martineau static int l2cap_resegment(struct l2cap_chan *chan) 534232b32735SMat Martineau { 534332b32735SMat Martineau /* Placeholder */ 534432b32735SMat Martineau return 0; 534532b32735SMat Martineau } 534632b32735SMat Martineau 5347e328140fSMat Martineau void l2cap_chan_busy(struct l2cap_chan *chan, int busy) 53480a708f8fSGustavo F. Padovan { 534961aa4f5bSMat Martineau u8 event; 535061aa4f5bSMat Martineau 535161aa4f5bSMat Martineau if (chan->mode != L2CAP_MODE_ERTM) 535261aa4f5bSMat Martineau return; 535361aa4f5bSMat Martineau 535461aa4f5bSMat Martineau event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR; 5355401bb1f7SAndrei Emeltchenko l2cap_tx(chan, NULL, NULL, event); 53560a708f8fSGustavo F. Padovan } 53570a708f8fSGustavo F. Padovan 5358d2a7ac5dSMat Martineau static int l2cap_rx_queued_iframes(struct l2cap_chan *chan) 5359d2a7ac5dSMat Martineau { 536063838725SMat Martineau int err = 0; 536163838725SMat Martineau /* Pass sequential frames to l2cap_reassemble_sdu() 536263838725SMat Martineau * until a gap is encountered. 536363838725SMat Martineau */ 536463838725SMat Martineau 536563838725SMat Martineau BT_DBG("chan %p", chan); 536663838725SMat Martineau 536763838725SMat Martineau while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { 536863838725SMat Martineau struct sk_buff *skb; 536963838725SMat Martineau BT_DBG("Searching for skb with txseq %d (queue len %d)", 537063838725SMat Martineau chan->buffer_seq, skb_queue_len(&chan->srej_q)); 537163838725SMat Martineau 537263838725SMat Martineau skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq); 537363838725SMat Martineau 537463838725SMat Martineau if (!skb) 537563838725SMat Martineau break; 537663838725SMat Martineau 537763838725SMat Martineau skb_unlink(skb, &chan->srej_q); 537863838725SMat Martineau chan->buffer_seq = __next_seq(chan, chan->buffer_seq); 537963838725SMat Martineau err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->control); 538063838725SMat Martineau if (err) 538163838725SMat Martineau break; 538263838725SMat Martineau } 538363838725SMat Martineau 538463838725SMat Martineau if (skb_queue_empty(&chan->srej_q)) { 538563838725SMat Martineau chan->rx_state = L2CAP_RX_STATE_RECV; 538663838725SMat Martineau l2cap_send_ack(chan); 538763838725SMat Martineau } 538863838725SMat Martineau 538963838725SMat Martineau return err; 5390d2a7ac5dSMat Martineau } 5391d2a7ac5dSMat Martineau 5392d2a7ac5dSMat Martineau static void l2cap_handle_srej(struct l2cap_chan *chan, 5393d2a7ac5dSMat Martineau struct l2cap_ctrl *control) 5394d2a7ac5dSMat Martineau { 5395f80842a8SMat Martineau struct sk_buff *skb; 5396f80842a8SMat Martineau 5397f80842a8SMat Martineau BT_DBG("chan %p, control %p", chan, control); 5398f80842a8SMat Martineau 5399f80842a8SMat Martineau if (control->reqseq == chan->next_tx_seq) { 5400f80842a8SMat Martineau BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); 54015e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 5402f80842a8SMat Martineau return; 5403f80842a8SMat Martineau } 5404f80842a8SMat Martineau 5405f80842a8SMat Martineau skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); 5406f80842a8SMat Martineau 5407f80842a8SMat Martineau if (skb == NULL) { 5408f80842a8SMat Martineau BT_DBG("Seq %d not available for retransmission", 5409f80842a8SMat Martineau control->reqseq); 5410f80842a8SMat Martineau return; 5411f80842a8SMat Martineau } 5412f80842a8SMat Martineau 5413f80842a8SMat Martineau if (chan->max_tx != 0 && bt_cb(skb)->control.retries >= chan->max_tx) { 5414f80842a8SMat Martineau BT_DBG("Retry limit exceeded (%d)", chan->max_tx); 54155e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 5416f80842a8SMat Martineau return; 5417f80842a8SMat Martineau } 5418f80842a8SMat Martineau 5419f80842a8SMat Martineau clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); 5420f80842a8SMat Martineau 5421f80842a8SMat Martineau if (control->poll) { 5422f80842a8SMat Martineau l2cap_pass_to_tx(chan, control); 5423f80842a8SMat Martineau 5424f80842a8SMat Martineau set_bit(CONN_SEND_FBIT, &chan->conn_state); 5425f80842a8SMat Martineau l2cap_retransmit(chan, control); 5426f80842a8SMat Martineau l2cap_ertm_send(chan); 5427f80842a8SMat Martineau 5428f80842a8SMat Martineau if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { 5429f80842a8SMat Martineau set_bit(CONN_SREJ_ACT, &chan->conn_state); 5430f80842a8SMat Martineau chan->srej_save_reqseq = control->reqseq; 5431f80842a8SMat Martineau } 5432f80842a8SMat Martineau } else { 5433f80842a8SMat Martineau l2cap_pass_to_tx_fbit(chan, control); 5434f80842a8SMat Martineau 5435f80842a8SMat Martineau if (control->final) { 5436f80842a8SMat Martineau if (chan->srej_save_reqseq != control->reqseq || 5437f80842a8SMat Martineau !test_and_clear_bit(CONN_SREJ_ACT, 5438f80842a8SMat Martineau &chan->conn_state)) 5439f80842a8SMat Martineau l2cap_retransmit(chan, control); 5440f80842a8SMat Martineau } else { 5441f80842a8SMat Martineau l2cap_retransmit(chan, control); 5442f80842a8SMat Martineau if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { 5443f80842a8SMat Martineau set_bit(CONN_SREJ_ACT, &chan->conn_state); 5444f80842a8SMat Martineau chan->srej_save_reqseq = control->reqseq; 5445f80842a8SMat Martineau } 5446f80842a8SMat Martineau } 5447f80842a8SMat Martineau } 5448d2a7ac5dSMat Martineau } 5449d2a7ac5dSMat Martineau 5450d2a7ac5dSMat Martineau static void l2cap_handle_rej(struct l2cap_chan *chan, 5451d2a7ac5dSMat Martineau struct l2cap_ctrl *control) 5452d2a7ac5dSMat Martineau { 5453fcd289dfSMat Martineau struct sk_buff *skb; 5454fcd289dfSMat Martineau 5455fcd289dfSMat Martineau BT_DBG("chan %p, control %p", chan, control); 5456fcd289dfSMat Martineau 5457fcd289dfSMat Martineau if (control->reqseq == chan->next_tx_seq) { 5458fcd289dfSMat Martineau BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); 54595e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 5460fcd289dfSMat Martineau return; 5461fcd289dfSMat Martineau } 5462fcd289dfSMat Martineau 5463fcd289dfSMat Martineau skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); 5464fcd289dfSMat Martineau 5465fcd289dfSMat Martineau if (chan->max_tx && skb && 5466fcd289dfSMat Martineau bt_cb(skb)->control.retries >= chan->max_tx) { 5467fcd289dfSMat Martineau BT_DBG("Retry limit exceeded (%d)", chan->max_tx); 54685e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 5469fcd289dfSMat Martineau return; 5470fcd289dfSMat Martineau } 5471fcd289dfSMat Martineau 5472fcd289dfSMat Martineau clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); 5473fcd289dfSMat Martineau 5474fcd289dfSMat Martineau l2cap_pass_to_tx(chan, control); 5475fcd289dfSMat Martineau 5476fcd289dfSMat Martineau if (control->final) { 5477fcd289dfSMat Martineau if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) 5478fcd289dfSMat Martineau l2cap_retransmit_all(chan, control); 5479fcd289dfSMat Martineau } else { 5480fcd289dfSMat Martineau l2cap_retransmit_all(chan, control); 5481fcd289dfSMat Martineau l2cap_ertm_send(chan); 5482fcd289dfSMat Martineau if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) 5483fcd289dfSMat Martineau set_bit(CONN_REJ_ACT, &chan->conn_state); 5484fcd289dfSMat Martineau } 5485d2a7ac5dSMat Martineau } 5486d2a7ac5dSMat Martineau 54874b51dae9SMat Martineau static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq) 54884b51dae9SMat Martineau { 54894b51dae9SMat Martineau BT_DBG("chan %p, txseq %d", chan, txseq); 54904b51dae9SMat Martineau 54914b51dae9SMat Martineau BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq, 54924b51dae9SMat Martineau chan->expected_tx_seq); 54934b51dae9SMat Martineau 54944b51dae9SMat Martineau if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { 54954b51dae9SMat Martineau if (__seq_offset(chan, txseq, chan->last_acked_seq) >= 54964b51dae9SMat Martineau chan->tx_win) { 54974b51dae9SMat Martineau /* See notes below regarding "double poll" and 54984b51dae9SMat Martineau * invalid packets. 54994b51dae9SMat Martineau */ 55004b51dae9SMat Martineau if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { 55014b51dae9SMat Martineau BT_DBG("Invalid/Ignore - after SREJ"); 55024b51dae9SMat Martineau return L2CAP_TXSEQ_INVALID_IGNORE; 55034b51dae9SMat Martineau } else { 55044b51dae9SMat Martineau BT_DBG("Invalid - in window after SREJ sent"); 55054b51dae9SMat Martineau return L2CAP_TXSEQ_INVALID; 55064b51dae9SMat Martineau } 55074b51dae9SMat Martineau } 55084b51dae9SMat Martineau 55094b51dae9SMat Martineau if (chan->srej_list.head == txseq) { 55104b51dae9SMat Martineau BT_DBG("Expected SREJ"); 55114b51dae9SMat Martineau return L2CAP_TXSEQ_EXPECTED_SREJ; 55124b51dae9SMat Martineau } 55134b51dae9SMat Martineau 55144b51dae9SMat Martineau if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) { 55154b51dae9SMat Martineau BT_DBG("Duplicate SREJ - txseq already stored"); 55164b51dae9SMat Martineau return L2CAP_TXSEQ_DUPLICATE_SREJ; 55174b51dae9SMat Martineau } 55184b51dae9SMat Martineau 55194b51dae9SMat Martineau if (l2cap_seq_list_contains(&chan->srej_list, txseq)) { 55204b51dae9SMat Martineau BT_DBG("Unexpected SREJ - not requested"); 55214b51dae9SMat Martineau return L2CAP_TXSEQ_UNEXPECTED_SREJ; 55224b51dae9SMat Martineau } 55234b51dae9SMat Martineau } 55244b51dae9SMat Martineau 55254b51dae9SMat Martineau if (chan->expected_tx_seq == txseq) { 55264b51dae9SMat Martineau if (__seq_offset(chan, txseq, chan->last_acked_seq) >= 55274b51dae9SMat Martineau chan->tx_win) { 55284b51dae9SMat Martineau BT_DBG("Invalid - txseq outside tx window"); 55294b51dae9SMat Martineau return L2CAP_TXSEQ_INVALID; 55304b51dae9SMat Martineau } else { 55314b51dae9SMat Martineau BT_DBG("Expected"); 55324b51dae9SMat Martineau return L2CAP_TXSEQ_EXPECTED; 55334b51dae9SMat Martineau } 55344b51dae9SMat Martineau } 55354b51dae9SMat Martineau 55364b51dae9SMat Martineau if (__seq_offset(chan, txseq, chan->last_acked_seq) < 55372d792818SGustavo Padovan __seq_offset(chan, chan->expected_tx_seq, chan->last_acked_seq)) { 55384b51dae9SMat Martineau BT_DBG("Duplicate - expected_tx_seq later than txseq"); 55394b51dae9SMat Martineau return L2CAP_TXSEQ_DUPLICATE; 55404b51dae9SMat Martineau } 55414b51dae9SMat Martineau 55424b51dae9SMat Martineau if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) { 55434b51dae9SMat Martineau /* A source of invalid packets is a "double poll" condition, 55444b51dae9SMat Martineau * where delays cause us to send multiple poll packets. If 55454b51dae9SMat Martineau * the remote stack receives and processes both polls, 55464b51dae9SMat Martineau * sequence numbers can wrap around in such a way that a 55474b51dae9SMat Martineau * resent frame has a sequence number that looks like new data 55484b51dae9SMat Martineau * with a sequence gap. This would trigger an erroneous SREJ 55494b51dae9SMat Martineau * request. 55504b51dae9SMat Martineau * 55514b51dae9SMat Martineau * Fortunately, this is impossible with a tx window that's 55524b51dae9SMat Martineau * less than half of the maximum sequence number, which allows 55534b51dae9SMat Martineau * invalid frames to be safely ignored. 55544b51dae9SMat Martineau * 55554b51dae9SMat Martineau * With tx window sizes greater than half of the tx window 55564b51dae9SMat Martineau * maximum, the frame is invalid and cannot be ignored. This 55574b51dae9SMat Martineau * causes a disconnect. 55584b51dae9SMat Martineau */ 55594b51dae9SMat Martineau 55604b51dae9SMat Martineau if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { 55614b51dae9SMat Martineau BT_DBG("Invalid/Ignore - txseq outside tx window"); 55624b51dae9SMat Martineau return L2CAP_TXSEQ_INVALID_IGNORE; 55634b51dae9SMat Martineau } else { 55644b51dae9SMat Martineau BT_DBG("Invalid - txseq outside tx window"); 55654b51dae9SMat Martineau return L2CAP_TXSEQ_INVALID; 55664b51dae9SMat Martineau } 55674b51dae9SMat Martineau } else { 55684b51dae9SMat Martineau BT_DBG("Unexpected - txseq indicates missing frames"); 55694b51dae9SMat Martineau return L2CAP_TXSEQ_UNEXPECTED; 55704b51dae9SMat Martineau } 55714b51dae9SMat Martineau } 55724b51dae9SMat Martineau 5573d2a7ac5dSMat Martineau static int l2cap_rx_state_recv(struct l2cap_chan *chan, 5574d2a7ac5dSMat Martineau struct l2cap_ctrl *control, 5575d2a7ac5dSMat Martineau struct sk_buff *skb, u8 event) 5576d2a7ac5dSMat Martineau { 5577d2a7ac5dSMat Martineau int err = 0; 5578d2a7ac5dSMat Martineau bool skb_in_use = 0; 5579d2a7ac5dSMat Martineau 5580d2a7ac5dSMat Martineau BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, 5581d2a7ac5dSMat Martineau event); 5582d2a7ac5dSMat Martineau 5583d2a7ac5dSMat Martineau switch (event) { 5584d2a7ac5dSMat Martineau case L2CAP_EV_RECV_IFRAME: 5585d2a7ac5dSMat Martineau switch (l2cap_classify_txseq(chan, control->txseq)) { 5586d2a7ac5dSMat Martineau case L2CAP_TXSEQ_EXPECTED: 5587d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 5588d2a7ac5dSMat Martineau 5589d2a7ac5dSMat Martineau if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { 5590d2a7ac5dSMat Martineau BT_DBG("Busy, discarding expected seq %d", 5591d2a7ac5dSMat Martineau control->txseq); 5592d2a7ac5dSMat Martineau break; 5593d2a7ac5dSMat Martineau } 5594d2a7ac5dSMat Martineau 5595d2a7ac5dSMat Martineau chan->expected_tx_seq = __next_seq(chan, 5596d2a7ac5dSMat Martineau control->txseq); 5597d2a7ac5dSMat Martineau 5598d2a7ac5dSMat Martineau chan->buffer_seq = chan->expected_tx_seq; 5599d2a7ac5dSMat Martineau skb_in_use = 1; 5600d2a7ac5dSMat Martineau 5601d2a7ac5dSMat Martineau err = l2cap_reassemble_sdu(chan, skb, control); 5602d2a7ac5dSMat Martineau if (err) 5603d2a7ac5dSMat Martineau break; 5604d2a7ac5dSMat Martineau 5605d2a7ac5dSMat Martineau if (control->final) { 5606d2a7ac5dSMat Martineau if (!test_and_clear_bit(CONN_REJ_ACT, 5607d2a7ac5dSMat Martineau &chan->conn_state)) { 5608d2a7ac5dSMat Martineau control->final = 0; 5609d2a7ac5dSMat Martineau l2cap_retransmit_all(chan, control); 5610d2a7ac5dSMat Martineau l2cap_ertm_send(chan); 5611d2a7ac5dSMat Martineau } 5612d2a7ac5dSMat Martineau } 5613d2a7ac5dSMat Martineau 5614d2a7ac5dSMat Martineau if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) 5615d2a7ac5dSMat Martineau l2cap_send_ack(chan); 5616d2a7ac5dSMat Martineau break; 5617d2a7ac5dSMat Martineau case L2CAP_TXSEQ_UNEXPECTED: 5618d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 5619d2a7ac5dSMat Martineau 5620d2a7ac5dSMat Martineau /* Can't issue SREJ frames in the local busy state. 5621d2a7ac5dSMat Martineau * Drop this frame, it will be seen as missing 5622d2a7ac5dSMat Martineau * when local busy is exited. 5623d2a7ac5dSMat Martineau */ 5624d2a7ac5dSMat Martineau if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { 5625d2a7ac5dSMat Martineau BT_DBG("Busy, discarding unexpected seq %d", 5626d2a7ac5dSMat Martineau control->txseq); 5627d2a7ac5dSMat Martineau break; 5628d2a7ac5dSMat Martineau } 5629d2a7ac5dSMat Martineau 5630d2a7ac5dSMat Martineau /* There was a gap in the sequence, so an SREJ 5631d2a7ac5dSMat Martineau * must be sent for each missing frame. The 5632d2a7ac5dSMat Martineau * current frame is stored for later use. 5633d2a7ac5dSMat Martineau */ 5634d2a7ac5dSMat Martineau skb_queue_tail(&chan->srej_q, skb); 5635d2a7ac5dSMat Martineau skb_in_use = 1; 5636d2a7ac5dSMat Martineau BT_DBG("Queued %p (queue len %d)", skb, 5637d2a7ac5dSMat Martineau skb_queue_len(&chan->srej_q)); 5638d2a7ac5dSMat Martineau 5639d2a7ac5dSMat Martineau clear_bit(CONN_SREJ_ACT, &chan->conn_state); 5640d2a7ac5dSMat Martineau l2cap_seq_list_clear(&chan->srej_list); 5641d2a7ac5dSMat Martineau l2cap_send_srej(chan, control->txseq); 5642d2a7ac5dSMat Martineau 5643d2a7ac5dSMat Martineau chan->rx_state = L2CAP_RX_STATE_SREJ_SENT; 5644d2a7ac5dSMat Martineau break; 5645d2a7ac5dSMat Martineau case L2CAP_TXSEQ_DUPLICATE: 5646d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 5647d2a7ac5dSMat Martineau break; 5648d2a7ac5dSMat Martineau case L2CAP_TXSEQ_INVALID_IGNORE: 5649d2a7ac5dSMat Martineau break; 5650d2a7ac5dSMat Martineau case L2CAP_TXSEQ_INVALID: 5651d2a7ac5dSMat Martineau default: 56525e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 5653d2a7ac5dSMat Martineau break; 5654d2a7ac5dSMat Martineau } 5655d2a7ac5dSMat Martineau break; 5656d2a7ac5dSMat Martineau case L2CAP_EV_RECV_RR: 5657d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 5658d2a7ac5dSMat Martineau if (control->final) { 5659d2a7ac5dSMat Martineau clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); 5660d2a7ac5dSMat Martineau 5661e6a3ee6eSMat Martineau if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state) && 5662e6a3ee6eSMat Martineau !__chan_is_moving(chan)) { 5663d2a7ac5dSMat Martineau control->final = 0; 5664d2a7ac5dSMat Martineau l2cap_retransmit_all(chan, control); 5665d2a7ac5dSMat Martineau } 5666d2a7ac5dSMat Martineau 5667d2a7ac5dSMat Martineau l2cap_ertm_send(chan); 5668d2a7ac5dSMat Martineau } else if (control->poll) { 5669d2a7ac5dSMat Martineau l2cap_send_i_or_rr_or_rnr(chan); 5670d2a7ac5dSMat Martineau } else { 5671d2a7ac5dSMat Martineau if (test_and_clear_bit(CONN_REMOTE_BUSY, 5672d2a7ac5dSMat Martineau &chan->conn_state) && 5673d2a7ac5dSMat Martineau chan->unacked_frames) 5674d2a7ac5dSMat Martineau __set_retrans_timer(chan); 5675d2a7ac5dSMat Martineau 5676d2a7ac5dSMat Martineau l2cap_ertm_send(chan); 5677d2a7ac5dSMat Martineau } 5678d2a7ac5dSMat Martineau break; 5679d2a7ac5dSMat Martineau case L2CAP_EV_RECV_RNR: 5680d2a7ac5dSMat Martineau set_bit(CONN_REMOTE_BUSY, &chan->conn_state); 5681d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 5682d2a7ac5dSMat Martineau if (control && control->poll) { 5683d2a7ac5dSMat Martineau set_bit(CONN_SEND_FBIT, &chan->conn_state); 5684d2a7ac5dSMat Martineau l2cap_send_rr_or_rnr(chan, 0); 5685d2a7ac5dSMat Martineau } 5686d2a7ac5dSMat Martineau __clear_retrans_timer(chan); 5687d2a7ac5dSMat Martineau l2cap_seq_list_clear(&chan->retrans_list); 5688d2a7ac5dSMat Martineau break; 5689d2a7ac5dSMat Martineau case L2CAP_EV_RECV_REJ: 5690d2a7ac5dSMat Martineau l2cap_handle_rej(chan, control); 5691d2a7ac5dSMat Martineau break; 5692d2a7ac5dSMat Martineau case L2CAP_EV_RECV_SREJ: 5693d2a7ac5dSMat Martineau l2cap_handle_srej(chan, control); 5694d2a7ac5dSMat Martineau break; 5695d2a7ac5dSMat Martineau default: 5696d2a7ac5dSMat Martineau break; 5697d2a7ac5dSMat Martineau } 5698d2a7ac5dSMat Martineau 5699d2a7ac5dSMat Martineau if (skb && !skb_in_use) { 5700d2a7ac5dSMat Martineau BT_DBG("Freeing %p", skb); 5701d2a7ac5dSMat Martineau kfree_skb(skb); 5702d2a7ac5dSMat Martineau } 5703d2a7ac5dSMat Martineau 5704d2a7ac5dSMat Martineau return err; 5705d2a7ac5dSMat Martineau } 5706d2a7ac5dSMat Martineau 5707d2a7ac5dSMat Martineau static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan, 5708d2a7ac5dSMat Martineau struct l2cap_ctrl *control, 5709d2a7ac5dSMat Martineau struct sk_buff *skb, u8 event) 5710d2a7ac5dSMat Martineau { 5711d2a7ac5dSMat Martineau int err = 0; 5712d2a7ac5dSMat Martineau u16 txseq = control->txseq; 5713d2a7ac5dSMat Martineau bool skb_in_use = 0; 5714d2a7ac5dSMat Martineau 5715d2a7ac5dSMat Martineau BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, 5716d2a7ac5dSMat Martineau event); 5717d2a7ac5dSMat Martineau 5718d2a7ac5dSMat Martineau switch (event) { 5719d2a7ac5dSMat Martineau case L2CAP_EV_RECV_IFRAME: 5720d2a7ac5dSMat Martineau switch (l2cap_classify_txseq(chan, txseq)) { 5721d2a7ac5dSMat Martineau case L2CAP_TXSEQ_EXPECTED: 5722d2a7ac5dSMat Martineau /* Keep frame for reassembly later */ 5723d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 5724d2a7ac5dSMat Martineau skb_queue_tail(&chan->srej_q, skb); 5725d2a7ac5dSMat Martineau skb_in_use = 1; 5726d2a7ac5dSMat Martineau BT_DBG("Queued %p (queue len %d)", skb, 5727d2a7ac5dSMat Martineau skb_queue_len(&chan->srej_q)); 5728d2a7ac5dSMat Martineau 5729d2a7ac5dSMat Martineau chan->expected_tx_seq = __next_seq(chan, txseq); 5730d2a7ac5dSMat Martineau break; 5731d2a7ac5dSMat Martineau case L2CAP_TXSEQ_EXPECTED_SREJ: 5732d2a7ac5dSMat Martineau l2cap_seq_list_pop(&chan->srej_list); 5733d2a7ac5dSMat Martineau 5734d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 5735d2a7ac5dSMat Martineau skb_queue_tail(&chan->srej_q, skb); 5736d2a7ac5dSMat Martineau skb_in_use = 1; 5737d2a7ac5dSMat Martineau BT_DBG("Queued %p (queue len %d)", skb, 5738d2a7ac5dSMat Martineau skb_queue_len(&chan->srej_q)); 5739d2a7ac5dSMat Martineau 5740d2a7ac5dSMat Martineau err = l2cap_rx_queued_iframes(chan); 5741d2a7ac5dSMat Martineau if (err) 5742d2a7ac5dSMat Martineau break; 5743d2a7ac5dSMat Martineau 5744d2a7ac5dSMat Martineau break; 5745d2a7ac5dSMat Martineau case L2CAP_TXSEQ_UNEXPECTED: 5746d2a7ac5dSMat Martineau /* Got a frame that can't be reassembled yet. 5747d2a7ac5dSMat Martineau * Save it for later, and send SREJs to cover 5748d2a7ac5dSMat Martineau * the missing frames. 5749d2a7ac5dSMat Martineau */ 5750d2a7ac5dSMat Martineau skb_queue_tail(&chan->srej_q, skb); 5751d2a7ac5dSMat Martineau skb_in_use = 1; 5752d2a7ac5dSMat Martineau BT_DBG("Queued %p (queue len %d)", skb, 5753d2a7ac5dSMat Martineau skb_queue_len(&chan->srej_q)); 5754d2a7ac5dSMat Martineau 5755d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 5756d2a7ac5dSMat Martineau l2cap_send_srej(chan, control->txseq); 5757d2a7ac5dSMat Martineau break; 5758d2a7ac5dSMat Martineau case L2CAP_TXSEQ_UNEXPECTED_SREJ: 5759d2a7ac5dSMat Martineau /* This frame was requested with an SREJ, but 5760d2a7ac5dSMat Martineau * some expected retransmitted frames are 5761d2a7ac5dSMat Martineau * missing. Request retransmission of missing 5762d2a7ac5dSMat Martineau * SREJ'd frames. 5763d2a7ac5dSMat Martineau */ 5764d2a7ac5dSMat Martineau skb_queue_tail(&chan->srej_q, skb); 5765d2a7ac5dSMat Martineau skb_in_use = 1; 5766d2a7ac5dSMat Martineau BT_DBG("Queued %p (queue len %d)", skb, 5767d2a7ac5dSMat Martineau skb_queue_len(&chan->srej_q)); 5768d2a7ac5dSMat Martineau 5769d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 5770d2a7ac5dSMat Martineau l2cap_send_srej_list(chan, control->txseq); 5771d2a7ac5dSMat Martineau break; 5772d2a7ac5dSMat Martineau case L2CAP_TXSEQ_DUPLICATE_SREJ: 5773d2a7ac5dSMat Martineau /* We've already queued this frame. Drop this copy. */ 5774d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 5775d2a7ac5dSMat Martineau break; 5776d2a7ac5dSMat Martineau case L2CAP_TXSEQ_DUPLICATE: 5777d2a7ac5dSMat Martineau /* Expecting a later sequence number, so this frame 5778d2a7ac5dSMat Martineau * was already received. Ignore it completely. 5779d2a7ac5dSMat Martineau */ 5780d2a7ac5dSMat Martineau break; 5781d2a7ac5dSMat Martineau case L2CAP_TXSEQ_INVALID_IGNORE: 5782d2a7ac5dSMat Martineau break; 5783d2a7ac5dSMat Martineau case L2CAP_TXSEQ_INVALID: 5784d2a7ac5dSMat Martineau default: 57855e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 5786d2a7ac5dSMat Martineau break; 5787d2a7ac5dSMat Martineau } 5788d2a7ac5dSMat Martineau break; 5789d2a7ac5dSMat Martineau case L2CAP_EV_RECV_RR: 5790d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 5791d2a7ac5dSMat Martineau if (control->final) { 5792d2a7ac5dSMat Martineau clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); 5793d2a7ac5dSMat Martineau 5794d2a7ac5dSMat Martineau if (!test_and_clear_bit(CONN_REJ_ACT, 5795d2a7ac5dSMat Martineau &chan->conn_state)) { 5796d2a7ac5dSMat Martineau control->final = 0; 5797d2a7ac5dSMat Martineau l2cap_retransmit_all(chan, control); 5798d2a7ac5dSMat Martineau } 5799d2a7ac5dSMat Martineau 5800d2a7ac5dSMat Martineau l2cap_ertm_send(chan); 5801d2a7ac5dSMat Martineau } else if (control->poll) { 5802d2a7ac5dSMat Martineau if (test_and_clear_bit(CONN_REMOTE_BUSY, 5803d2a7ac5dSMat Martineau &chan->conn_state) && 5804d2a7ac5dSMat Martineau chan->unacked_frames) { 5805d2a7ac5dSMat Martineau __set_retrans_timer(chan); 5806d2a7ac5dSMat Martineau } 5807d2a7ac5dSMat Martineau 5808d2a7ac5dSMat Martineau set_bit(CONN_SEND_FBIT, &chan->conn_state); 5809d2a7ac5dSMat Martineau l2cap_send_srej_tail(chan); 5810d2a7ac5dSMat Martineau } else { 5811d2a7ac5dSMat Martineau if (test_and_clear_bit(CONN_REMOTE_BUSY, 5812d2a7ac5dSMat Martineau &chan->conn_state) && 5813d2a7ac5dSMat Martineau chan->unacked_frames) 5814d2a7ac5dSMat Martineau __set_retrans_timer(chan); 5815d2a7ac5dSMat Martineau 5816d2a7ac5dSMat Martineau l2cap_send_ack(chan); 5817d2a7ac5dSMat Martineau } 5818d2a7ac5dSMat Martineau break; 5819d2a7ac5dSMat Martineau case L2CAP_EV_RECV_RNR: 5820d2a7ac5dSMat Martineau set_bit(CONN_REMOTE_BUSY, &chan->conn_state); 5821d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 5822d2a7ac5dSMat Martineau if (control->poll) { 5823d2a7ac5dSMat Martineau l2cap_send_srej_tail(chan); 5824d2a7ac5dSMat Martineau } else { 5825d2a7ac5dSMat Martineau struct l2cap_ctrl rr_control; 5826d2a7ac5dSMat Martineau memset(&rr_control, 0, sizeof(rr_control)); 5827d2a7ac5dSMat Martineau rr_control.sframe = 1; 5828d2a7ac5dSMat Martineau rr_control.super = L2CAP_SUPER_RR; 5829d2a7ac5dSMat Martineau rr_control.reqseq = chan->buffer_seq; 5830d2a7ac5dSMat Martineau l2cap_send_sframe(chan, &rr_control); 5831d2a7ac5dSMat Martineau } 5832d2a7ac5dSMat Martineau 5833d2a7ac5dSMat Martineau break; 5834d2a7ac5dSMat Martineau case L2CAP_EV_RECV_REJ: 5835d2a7ac5dSMat Martineau l2cap_handle_rej(chan, control); 5836d2a7ac5dSMat Martineau break; 5837d2a7ac5dSMat Martineau case L2CAP_EV_RECV_SREJ: 5838d2a7ac5dSMat Martineau l2cap_handle_srej(chan, control); 5839d2a7ac5dSMat Martineau break; 5840d2a7ac5dSMat Martineau } 5841d2a7ac5dSMat Martineau 5842d2a7ac5dSMat Martineau if (skb && !skb_in_use) { 5843d2a7ac5dSMat Martineau BT_DBG("Freeing %p", skb); 5844d2a7ac5dSMat Martineau kfree_skb(skb); 5845d2a7ac5dSMat Martineau } 5846d2a7ac5dSMat Martineau 5847d2a7ac5dSMat Martineau return err; 5848d2a7ac5dSMat Martineau } 5849d2a7ac5dSMat Martineau 585032b32735SMat Martineau static int l2cap_finish_move(struct l2cap_chan *chan) 585132b32735SMat Martineau { 585232b32735SMat Martineau BT_DBG("chan %p", chan); 585332b32735SMat Martineau 585432b32735SMat Martineau chan->rx_state = L2CAP_RX_STATE_RECV; 585532b32735SMat Martineau 585632b32735SMat Martineau if (chan->hs_hcon) 585732b32735SMat Martineau chan->conn->mtu = chan->hs_hcon->hdev->block_mtu; 585832b32735SMat Martineau else 585932b32735SMat Martineau chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu; 586032b32735SMat Martineau 586132b32735SMat Martineau return l2cap_resegment(chan); 586232b32735SMat Martineau } 586332b32735SMat Martineau 586432b32735SMat Martineau static int l2cap_rx_state_wait_p(struct l2cap_chan *chan, 586532b32735SMat Martineau struct l2cap_ctrl *control, 586632b32735SMat Martineau struct sk_buff *skb, u8 event) 586732b32735SMat Martineau { 586832b32735SMat Martineau int err; 586932b32735SMat Martineau 587032b32735SMat Martineau BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, 587132b32735SMat Martineau event); 587232b32735SMat Martineau 587332b32735SMat Martineau if (!control->poll) 587432b32735SMat Martineau return -EPROTO; 587532b32735SMat Martineau 587632b32735SMat Martineau l2cap_process_reqseq(chan, control->reqseq); 587732b32735SMat Martineau 587832b32735SMat Martineau if (!skb_queue_empty(&chan->tx_q)) 587932b32735SMat Martineau chan->tx_send_head = skb_peek(&chan->tx_q); 588032b32735SMat Martineau else 588132b32735SMat Martineau chan->tx_send_head = NULL; 588232b32735SMat Martineau 588332b32735SMat Martineau /* Rewind next_tx_seq to the point expected 588432b32735SMat Martineau * by the receiver. 588532b32735SMat Martineau */ 588632b32735SMat Martineau chan->next_tx_seq = control->reqseq; 588732b32735SMat Martineau chan->unacked_frames = 0; 588832b32735SMat Martineau 588932b32735SMat Martineau err = l2cap_finish_move(chan); 589032b32735SMat Martineau if (err) 589132b32735SMat Martineau return err; 589232b32735SMat Martineau 589332b32735SMat Martineau set_bit(CONN_SEND_FBIT, &chan->conn_state); 589432b32735SMat Martineau l2cap_send_i_or_rr_or_rnr(chan); 589532b32735SMat Martineau 589632b32735SMat Martineau if (event == L2CAP_EV_RECV_IFRAME) 589732b32735SMat Martineau return -EPROTO; 589832b32735SMat Martineau 589932b32735SMat Martineau return l2cap_rx_state_recv(chan, control, NULL, event); 590032b32735SMat Martineau } 590132b32735SMat Martineau 590232b32735SMat Martineau static int l2cap_rx_state_wait_f(struct l2cap_chan *chan, 590332b32735SMat Martineau struct l2cap_ctrl *control, 590432b32735SMat Martineau struct sk_buff *skb, u8 event) 590532b32735SMat Martineau { 590632b32735SMat Martineau int err; 590732b32735SMat Martineau 590832b32735SMat Martineau if (!control->final) 590932b32735SMat Martineau return -EPROTO; 591032b32735SMat Martineau 591132b32735SMat Martineau clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); 591232b32735SMat Martineau 591332b32735SMat Martineau chan->rx_state = L2CAP_RX_STATE_RECV; 591432b32735SMat Martineau l2cap_process_reqseq(chan, control->reqseq); 591532b32735SMat Martineau 591632b32735SMat Martineau if (!skb_queue_empty(&chan->tx_q)) 591732b32735SMat Martineau chan->tx_send_head = skb_peek(&chan->tx_q); 591832b32735SMat Martineau else 591932b32735SMat Martineau chan->tx_send_head = NULL; 592032b32735SMat Martineau 592132b32735SMat Martineau /* Rewind next_tx_seq to the point expected 592232b32735SMat Martineau * by the receiver. 592332b32735SMat Martineau */ 592432b32735SMat Martineau chan->next_tx_seq = control->reqseq; 592532b32735SMat Martineau chan->unacked_frames = 0; 592632b32735SMat Martineau 592732b32735SMat Martineau if (chan->hs_hcon) 592832b32735SMat Martineau chan->conn->mtu = chan->hs_hcon->hdev->block_mtu; 592932b32735SMat Martineau else 593032b32735SMat Martineau chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu; 593132b32735SMat Martineau 593232b32735SMat Martineau err = l2cap_resegment(chan); 593332b32735SMat Martineau 593432b32735SMat Martineau if (!err) 593532b32735SMat Martineau err = l2cap_rx_state_recv(chan, control, skb, event); 593632b32735SMat Martineau 593732b32735SMat Martineau return err; 593832b32735SMat Martineau } 593932b32735SMat Martineau 5940d2a7ac5dSMat Martineau static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq) 5941d2a7ac5dSMat Martineau { 5942d2a7ac5dSMat Martineau /* Make sure reqseq is for a packet that has been sent but not acked */ 5943d2a7ac5dSMat Martineau u16 unacked; 5944d2a7ac5dSMat Martineau 5945d2a7ac5dSMat Martineau unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq); 5946d2a7ac5dSMat Martineau return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked; 5947d2a7ac5dSMat Martineau } 5948d2a7ac5dSMat Martineau 5949cec8ab6eSMat Martineau static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, 5950cec8ab6eSMat Martineau struct sk_buff *skb, u8 event) 59510a708f8fSGustavo F. Padovan { 5952d2a7ac5dSMat Martineau int err = 0; 5953d2a7ac5dSMat Martineau 5954d2a7ac5dSMat Martineau BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan, 5955d2a7ac5dSMat Martineau control, skb, event, chan->rx_state); 5956d2a7ac5dSMat Martineau 5957d2a7ac5dSMat Martineau if (__valid_reqseq(chan, control->reqseq)) { 5958d2a7ac5dSMat Martineau switch (chan->rx_state) { 5959d2a7ac5dSMat Martineau case L2CAP_RX_STATE_RECV: 5960d2a7ac5dSMat Martineau err = l2cap_rx_state_recv(chan, control, skb, event); 5961d2a7ac5dSMat Martineau break; 5962d2a7ac5dSMat Martineau case L2CAP_RX_STATE_SREJ_SENT: 5963d2a7ac5dSMat Martineau err = l2cap_rx_state_srej_sent(chan, control, skb, 5964d2a7ac5dSMat Martineau event); 5965d2a7ac5dSMat Martineau break; 596632b32735SMat Martineau case L2CAP_RX_STATE_WAIT_P: 596732b32735SMat Martineau err = l2cap_rx_state_wait_p(chan, control, skb, event); 596832b32735SMat Martineau break; 596932b32735SMat Martineau case L2CAP_RX_STATE_WAIT_F: 597032b32735SMat Martineau err = l2cap_rx_state_wait_f(chan, control, skb, event); 597132b32735SMat Martineau break; 5972d2a7ac5dSMat Martineau default: 5973d2a7ac5dSMat Martineau /* shut it down */ 5974d2a7ac5dSMat Martineau break; 5975d2a7ac5dSMat Martineau } 5976d2a7ac5dSMat Martineau } else { 5977d2a7ac5dSMat Martineau BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d", 5978d2a7ac5dSMat Martineau control->reqseq, chan->next_tx_seq, 5979d2a7ac5dSMat Martineau chan->expected_ack_seq); 59805e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 5981d2a7ac5dSMat Martineau } 5982d2a7ac5dSMat Martineau 5983d2a7ac5dSMat Martineau return err; 5984cec8ab6eSMat Martineau } 5985cec8ab6eSMat Martineau 5986cec8ab6eSMat Martineau static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, 5987cec8ab6eSMat Martineau struct sk_buff *skb) 5988cec8ab6eSMat Martineau { 59894b51dae9SMat Martineau int err = 0; 59904b51dae9SMat Martineau 59914b51dae9SMat Martineau BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb, 59924b51dae9SMat Martineau chan->rx_state); 59934b51dae9SMat Martineau 59944b51dae9SMat Martineau if (l2cap_classify_txseq(chan, control->txseq) == 59954b51dae9SMat Martineau L2CAP_TXSEQ_EXPECTED) { 59964b51dae9SMat Martineau l2cap_pass_to_tx(chan, control); 59974b51dae9SMat Martineau 59984b51dae9SMat Martineau BT_DBG("buffer_seq %d->%d", chan->buffer_seq, 59994b51dae9SMat Martineau __next_seq(chan, chan->buffer_seq)); 60004b51dae9SMat Martineau 60014b51dae9SMat Martineau chan->buffer_seq = __next_seq(chan, chan->buffer_seq); 60024b51dae9SMat Martineau 60034b51dae9SMat Martineau l2cap_reassemble_sdu(chan, skb, control); 60044b51dae9SMat Martineau } else { 60054b51dae9SMat Martineau if (chan->sdu) { 60064b51dae9SMat Martineau kfree_skb(chan->sdu); 60074b51dae9SMat Martineau chan->sdu = NULL; 60084b51dae9SMat Martineau } 60094b51dae9SMat Martineau chan->sdu_last_frag = NULL; 60104b51dae9SMat Martineau chan->sdu_len = 0; 60114b51dae9SMat Martineau 60124b51dae9SMat Martineau if (skb) { 60134b51dae9SMat Martineau BT_DBG("Freeing %p", skb); 60144b51dae9SMat Martineau kfree_skb(skb); 60154b51dae9SMat Martineau } 60164b51dae9SMat Martineau } 60174b51dae9SMat Martineau 60184b51dae9SMat Martineau chan->last_acked_seq = control->txseq; 60194b51dae9SMat Martineau chan->expected_tx_seq = __next_seq(chan, control->txseq); 60204b51dae9SMat Martineau 60214b51dae9SMat Martineau return err; 6022cec8ab6eSMat Martineau } 6023cec8ab6eSMat Martineau 6024cec8ab6eSMat Martineau static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) 6025cec8ab6eSMat Martineau { 6026cec8ab6eSMat Martineau struct l2cap_ctrl *control = &bt_cb(skb)->control; 6027cec8ab6eSMat Martineau u16 len; 6028cec8ab6eSMat Martineau u8 event; 60290a708f8fSGustavo F. Padovan 6030b76bbd66SMat Martineau __unpack_control(chan, skb); 6031b76bbd66SMat Martineau 60320a708f8fSGustavo F. Padovan len = skb->len; 60330a708f8fSGustavo F. Padovan 60340a708f8fSGustavo F. Padovan /* 60350a708f8fSGustavo F. Padovan * We can just drop the corrupted I-frame here. 60360a708f8fSGustavo F. Padovan * Receiver will miss it and start proper recovery 6037cec8ab6eSMat Martineau * procedures and ask for retransmission. 60380a708f8fSGustavo F. Padovan */ 603947d1ec61SGustavo F. Padovan if (l2cap_check_fcs(chan, skb)) 60400a708f8fSGustavo F. Padovan goto drop; 60410a708f8fSGustavo F. Padovan 6042cec8ab6eSMat Martineau if (!control->sframe && control->sar == L2CAP_SAR_START) 604303a51213SAndrei Emeltchenko len -= L2CAP_SDULEN_SIZE; 60440a708f8fSGustavo F. Padovan 604547d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) 604603a51213SAndrei Emeltchenko len -= L2CAP_FCS_SIZE; 60470a708f8fSGustavo F. Padovan 604847d1ec61SGustavo F. Padovan if (len > chan->mps) { 60495e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 60500a708f8fSGustavo F. Padovan goto drop; 60510a708f8fSGustavo F. Padovan } 60520a708f8fSGustavo F. Padovan 6053cec8ab6eSMat Martineau if (!control->sframe) { 6054cec8ab6eSMat Martineau int err; 60550a708f8fSGustavo F. Padovan 6056cec8ab6eSMat Martineau BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d", 6057cec8ab6eSMat Martineau control->sar, control->reqseq, control->final, 6058cec8ab6eSMat Martineau control->txseq); 6059836be934SAndrei Emeltchenko 6060cec8ab6eSMat Martineau /* Validate F-bit - F=0 always valid, F=1 only 6061cec8ab6eSMat Martineau * valid in TX WAIT_F 6062cec8ab6eSMat Martineau */ 6063cec8ab6eSMat Martineau if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F) 60640a708f8fSGustavo F. Padovan goto drop; 60650a708f8fSGustavo F. Padovan 6066cec8ab6eSMat Martineau if (chan->mode != L2CAP_MODE_STREAMING) { 6067cec8ab6eSMat Martineau event = L2CAP_EV_RECV_IFRAME; 6068cec8ab6eSMat Martineau err = l2cap_rx(chan, control, skb, event); 60690a708f8fSGustavo F. Padovan } else { 6070cec8ab6eSMat Martineau err = l2cap_stream_rx(chan, control, skb); 6071cec8ab6eSMat Martineau } 6072cec8ab6eSMat Martineau 6073cec8ab6eSMat Martineau if (err) 60745e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 6075cec8ab6eSMat Martineau } else { 6076cec8ab6eSMat Martineau const u8 rx_func_to_event[4] = { 6077cec8ab6eSMat Martineau L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ, 6078cec8ab6eSMat Martineau L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ 6079cec8ab6eSMat Martineau }; 6080cec8ab6eSMat Martineau 6081cec8ab6eSMat Martineau /* Only I-frames are expected in streaming mode */ 6082cec8ab6eSMat Martineau if (chan->mode == L2CAP_MODE_STREAMING) 6083cec8ab6eSMat Martineau goto drop; 6084cec8ab6eSMat Martineau 6085cec8ab6eSMat Martineau BT_DBG("sframe reqseq %d, final %d, poll %d, super %d", 6086cec8ab6eSMat Martineau control->reqseq, control->final, control->poll, 6087cec8ab6eSMat Martineau control->super); 6088cec8ab6eSMat Martineau 60890a708f8fSGustavo F. Padovan if (len != 0) { 60901bb166e6SAndrei Emeltchenko BT_ERR("Trailing bytes: %d in sframe", len); 60915e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 60920a708f8fSGustavo F. Padovan goto drop; 60930a708f8fSGustavo F. Padovan } 60940a708f8fSGustavo F. Padovan 6095cec8ab6eSMat Martineau /* Validate F and P bits */ 6096cec8ab6eSMat Martineau if (control->final && (control->poll || 6097cec8ab6eSMat Martineau chan->tx_state != L2CAP_TX_STATE_WAIT_F)) 6098cec8ab6eSMat Martineau goto drop; 6099cec8ab6eSMat Martineau 6100cec8ab6eSMat Martineau event = rx_func_to_event[control->super]; 6101cec8ab6eSMat Martineau if (l2cap_rx(chan, control, skb, event)) 61025e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 61030a708f8fSGustavo F. Padovan } 61040a708f8fSGustavo F. Padovan 61050a708f8fSGustavo F. Padovan return 0; 61060a708f8fSGustavo F. Padovan 61070a708f8fSGustavo F. Padovan drop: 61080a708f8fSGustavo F. Padovan kfree_skb(skb); 61090a708f8fSGustavo F. Padovan return 0; 61100a708f8fSGustavo F. Padovan } 61110a708f8fSGustavo F. Padovan 611213ca56e0SAndrei Emeltchenko static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid, 611313ca56e0SAndrei Emeltchenko struct sk_buff *skb) 61140a708f8fSGustavo F. Padovan { 611548454079SGustavo F. Padovan struct l2cap_chan *chan; 61160a708f8fSGustavo F. Padovan 6117baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, cid); 611848454079SGustavo F. Padovan if (!chan) { 611997e8e89dSAndrei Emeltchenko if (cid == L2CAP_CID_A2MP) { 612097e8e89dSAndrei Emeltchenko chan = a2mp_channel_create(conn, skb); 612197e8e89dSAndrei Emeltchenko if (!chan) { 612297e8e89dSAndrei Emeltchenko kfree_skb(skb); 612313ca56e0SAndrei Emeltchenko return; 612497e8e89dSAndrei Emeltchenko } 612597e8e89dSAndrei Emeltchenko 612697e8e89dSAndrei Emeltchenko l2cap_chan_lock(chan); 612797e8e89dSAndrei Emeltchenko } else { 61280a708f8fSGustavo F. Padovan BT_DBG("unknown cid 0x%4.4x", cid); 61296be36555SAndrei Emeltchenko /* Drop packet and return */ 61303379013bSDan Carpenter kfree_skb(skb); 613113ca56e0SAndrei Emeltchenko return; 61320a708f8fSGustavo F. Padovan } 613397e8e89dSAndrei Emeltchenko } 61340a708f8fSGustavo F. Padovan 613549208c9cSGustavo F. Padovan BT_DBG("chan %p, len %d", chan, skb->len); 61360a708f8fSGustavo F. Padovan 613789bc500eSGustavo F. Padovan if (chan->state != BT_CONNECTED) 61380a708f8fSGustavo F. Padovan goto drop; 61390a708f8fSGustavo F. Padovan 61400c1bc5c6SGustavo F. Padovan switch (chan->mode) { 61410a708f8fSGustavo F. Padovan case L2CAP_MODE_BASIC: 61420a708f8fSGustavo F. Padovan /* If socket recv buffers overflows we drop data here 61430a708f8fSGustavo F. Padovan * which is *bad* because L2CAP has to be reliable. 61440a708f8fSGustavo F. Padovan * But we don't have any other choice. L2CAP doesn't 61450a708f8fSGustavo F. Padovan * provide flow control mechanism. */ 61460a708f8fSGustavo F. Padovan 61470c1bc5c6SGustavo F. Padovan if (chan->imtu < skb->len) 61480a708f8fSGustavo F. Padovan goto drop; 61490a708f8fSGustavo F. Padovan 615080b98027SGustavo Padovan if (!chan->ops->recv(chan, skb)) 61510a708f8fSGustavo F. Padovan goto done; 61520a708f8fSGustavo F. Padovan break; 61530a708f8fSGustavo F. Padovan 61540a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 61550a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 6156cec8ab6eSMat Martineau l2cap_data_rcv(chan, skb); 61570a708f8fSGustavo F. Padovan goto done; 61580a708f8fSGustavo F. Padovan 61590a708f8fSGustavo F. Padovan default: 61600c1bc5c6SGustavo F. Padovan BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode); 61610a708f8fSGustavo F. Padovan break; 61620a708f8fSGustavo F. Padovan } 61630a708f8fSGustavo F. Padovan 61640a708f8fSGustavo F. Padovan drop: 61650a708f8fSGustavo F. Padovan kfree_skb(skb); 61660a708f8fSGustavo F. Padovan 61670a708f8fSGustavo F. Padovan done: 61686be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 61690a708f8fSGustavo F. Padovan } 61700a708f8fSGustavo F. Padovan 617184104b24SAndrei Emeltchenko static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, 617284104b24SAndrei Emeltchenko struct sk_buff *skb) 61730a708f8fSGustavo F. Padovan { 617423691d75SGustavo F. Padovan struct l2cap_chan *chan; 61750a708f8fSGustavo F. Padovan 6176c2287681SIdo Yariv chan = l2cap_global_chan_by_psm(0, psm, conn->src, conn->dst); 617723691d75SGustavo F. Padovan if (!chan) 61780a708f8fSGustavo F. Padovan goto drop; 61790a708f8fSGustavo F. Padovan 61805b4cedaaSAndrei Emeltchenko BT_DBG("chan %p, len %d", chan, skb->len); 61810a708f8fSGustavo F. Padovan 618289bc500eSGustavo F. Padovan if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) 61830a708f8fSGustavo F. Padovan goto drop; 61840a708f8fSGustavo F. Padovan 6185e13e21dcSVinicius Costa Gomes if (chan->imtu < skb->len) 61860a708f8fSGustavo F. Padovan goto drop; 61870a708f8fSGustavo F. Padovan 618880b98027SGustavo Padovan if (!chan->ops->recv(chan, skb)) 618984104b24SAndrei Emeltchenko return; 61900a708f8fSGustavo F. Padovan 61910a708f8fSGustavo F. Padovan drop: 61920a708f8fSGustavo F. Padovan kfree_skb(skb); 61930a708f8fSGustavo F. Padovan } 61940a708f8fSGustavo F. Padovan 61956810fca7SAndrei Emeltchenko static void l2cap_att_channel(struct l2cap_conn *conn, u16 cid, 6196d9b88702SAndrei Emeltchenko struct sk_buff *skb) 61979f69bda6SGustavo F. Padovan { 619823691d75SGustavo F. Padovan struct l2cap_chan *chan; 61999f69bda6SGustavo F. Padovan 6200c2287681SIdo Yariv chan = l2cap_global_chan_by_scid(0, cid, conn->src, conn->dst); 620123691d75SGustavo F. Padovan if (!chan) 62029f69bda6SGustavo F. Padovan goto drop; 62039f69bda6SGustavo F. Padovan 62045b4cedaaSAndrei Emeltchenko BT_DBG("chan %p, len %d", chan, skb->len); 62059f69bda6SGustavo F. Padovan 620689bc500eSGustavo F. Padovan if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) 62079f69bda6SGustavo F. Padovan goto drop; 62089f69bda6SGustavo F. Padovan 6209e13e21dcSVinicius Costa Gomes if (chan->imtu < skb->len) 62109f69bda6SGustavo F. Padovan goto drop; 62119f69bda6SGustavo F. Padovan 621280b98027SGustavo Padovan if (!chan->ops->recv(chan, skb)) 62136810fca7SAndrei Emeltchenko return; 62149f69bda6SGustavo F. Padovan 62159f69bda6SGustavo F. Padovan drop: 62169f69bda6SGustavo F. Padovan kfree_skb(skb); 62179f69bda6SGustavo F. Padovan } 62189f69bda6SGustavo F. Padovan 62190a708f8fSGustavo F. Padovan static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) 62200a708f8fSGustavo F. Padovan { 62210a708f8fSGustavo F. Padovan struct l2cap_hdr *lh = (void *) skb->data; 62220a708f8fSGustavo F. Padovan u16 cid, len; 62230a708f8fSGustavo F. Padovan __le16 psm; 62240a708f8fSGustavo F. Padovan 62250a708f8fSGustavo F. Padovan skb_pull(skb, L2CAP_HDR_SIZE); 62260a708f8fSGustavo F. Padovan cid = __le16_to_cpu(lh->cid); 62270a708f8fSGustavo F. Padovan len = __le16_to_cpu(lh->len); 62280a708f8fSGustavo F. Padovan 62290a708f8fSGustavo F. Padovan if (len != skb->len) { 62300a708f8fSGustavo F. Padovan kfree_skb(skb); 62310a708f8fSGustavo F. Padovan return; 62320a708f8fSGustavo F. Padovan } 62330a708f8fSGustavo F. Padovan 62340a708f8fSGustavo F. Padovan BT_DBG("len %d, cid 0x%4.4x", len, cid); 62350a708f8fSGustavo F. Padovan 62360a708f8fSGustavo F. Padovan switch (cid) { 62373300d9a9SClaudio Takahasi case L2CAP_CID_LE_SIGNALING: 62380a708f8fSGustavo F. Padovan case L2CAP_CID_SIGNALING: 62390a708f8fSGustavo F. Padovan l2cap_sig_channel(conn, skb); 62400a708f8fSGustavo F. Padovan break; 62410a708f8fSGustavo F. Padovan 62420a708f8fSGustavo F. Padovan case L2CAP_CID_CONN_LESS: 6243097db76cSAndrei Emeltchenko psm = get_unaligned((__le16 *) skb->data); 62440181a70fSAndrei Emeltchenko skb_pull(skb, L2CAP_PSMLEN_SIZE); 62450a708f8fSGustavo F. Padovan l2cap_conless_channel(conn, psm, skb); 62460a708f8fSGustavo F. Padovan break; 62470a708f8fSGustavo F. Padovan 62489f69bda6SGustavo F. Padovan case L2CAP_CID_LE_DATA: 62499f69bda6SGustavo F. Padovan l2cap_att_channel(conn, cid, skb); 62509f69bda6SGustavo F. Padovan break; 62519f69bda6SGustavo F. Padovan 6252b501d6a1SAnderson Briglia case L2CAP_CID_SMP: 6253b501d6a1SAnderson Briglia if (smp_sig_channel(conn, skb)) 6254b501d6a1SAnderson Briglia l2cap_conn_del(conn->hcon, EACCES); 6255b501d6a1SAnderson Briglia break; 6256b501d6a1SAnderson Briglia 62570a708f8fSGustavo F. Padovan default: 62580a708f8fSGustavo F. Padovan l2cap_data_channel(conn, cid, skb); 62590a708f8fSGustavo F. Padovan break; 62600a708f8fSGustavo F. Padovan } 62610a708f8fSGustavo F. Padovan } 62620a708f8fSGustavo F. Padovan 62630a708f8fSGustavo F. Padovan /* ---- L2CAP interface with lower layer (HCI) ---- */ 62640a708f8fSGustavo F. Padovan 6265686ebf28SUlisses Furquim int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr) 62660a708f8fSGustavo F. Padovan { 62670a708f8fSGustavo F. Padovan int exact = 0, lm1 = 0, lm2 = 0; 626823691d75SGustavo F. Padovan struct l2cap_chan *c; 62690a708f8fSGustavo F. Padovan 62706ed93dc6SAndrei Emeltchenko BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr); 62710a708f8fSGustavo F. Padovan 62720a708f8fSGustavo F. Padovan /* Find listening sockets and check their link_mode */ 627323691d75SGustavo F. Padovan read_lock(&chan_list_lock); 627423691d75SGustavo F. Padovan list_for_each_entry(c, &chan_list, global_l) { 627523691d75SGustavo F. Padovan struct sock *sk = c->sk; 62764343478fSGustavo F. Padovan 627789bc500eSGustavo F. Padovan if (c->state != BT_LISTEN) 62780a708f8fSGustavo F. Padovan continue; 62790a708f8fSGustavo F. Padovan 62800a708f8fSGustavo F. Padovan if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { 62810a708f8fSGustavo F. Padovan lm1 |= HCI_LM_ACCEPT; 628243bd0f32SAndrei Emeltchenko if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) 62830a708f8fSGustavo F. Padovan lm1 |= HCI_LM_MASTER; 62840a708f8fSGustavo F. Padovan exact++; 62850a708f8fSGustavo F. Padovan } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { 62860a708f8fSGustavo F. Padovan lm2 |= HCI_LM_ACCEPT; 628743bd0f32SAndrei Emeltchenko if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) 62880a708f8fSGustavo F. Padovan lm2 |= HCI_LM_MASTER; 62890a708f8fSGustavo F. Padovan } 62900a708f8fSGustavo F. Padovan } 629123691d75SGustavo F. Padovan read_unlock(&chan_list_lock); 62920a708f8fSGustavo F. Padovan 62930a708f8fSGustavo F. Padovan return exact ? lm1 : lm2; 62940a708f8fSGustavo F. Padovan } 62950a708f8fSGustavo F. Padovan 62969e664631SAndrei Emeltchenko void l2cap_connect_cfm(struct hci_conn *hcon, u8 status) 62970a708f8fSGustavo F. Padovan { 62980a708f8fSGustavo F. Padovan struct l2cap_conn *conn; 62990a708f8fSGustavo F. Padovan 63006ed93dc6SAndrei Emeltchenko BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status); 63010a708f8fSGustavo F. Padovan 63020a708f8fSGustavo F. Padovan if (!status) { 63030a708f8fSGustavo F. Padovan conn = l2cap_conn_add(hcon, status); 63040a708f8fSGustavo F. Padovan if (conn) 63050a708f8fSGustavo F. Padovan l2cap_conn_ready(conn); 6306ba6fc317SAndrei Emeltchenko } else { 6307e175072fSJoe Perches l2cap_conn_del(hcon, bt_to_errno(status)); 6308ba6fc317SAndrei Emeltchenko } 63090a708f8fSGustavo F. Padovan } 63100a708f8fSGustavo F. Padovan 6311686ebf28SUlisses Furquim int l2cap_disconn_ind(struct hci_conn *hcon) 63120a708f8fSGustavo F. Padovan { 63130a708f8fSGustavo F. Padovan struct l2cap_conn *conn = hcon->l2cap_data; 63140a708f8fSGustavo F. Padovan 63150a708f8fSGustavo F. Padovan BT_DBG("hcon %p", hcon); 63160a708f8fSGustavo F. Padovan 6317686ebf28SUlisses Furquim if (!conn) 63189f5a0d7bSAndrei Emeltchenko return HCI_ERROR_REMOTE_USER_TERM; 63190a708f8fSGustavo F. Padovan return conn->disc_reason; 63200a708f8fSGustavo F. Padovan } 63210a708f8fSGustavo F. Padovan 63229e664631SAndrei Emeltchenko void l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) 63230a708f8fSGustavo F. Padovan { 63240a708f8fSGustavo F. Padovan BT_DBG("hcon %p reason %d", hcon, reason); 63250a708f8fSGustavo F. Padovan 6326e175072fSJoe Perches l2cap_conn_del(hcon, bt_to_errno(reason)); 63270a708f8fSGustavo F. Padovan } 63280a708f8fSGustavo F. Padovan 63294343478fSGustavo F. Padovan static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt) 63300a708f8fSGustavo F. Padovan { 6331715ec005SGustavo F. Padovan if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) 63320a708f8fSGustavo F. Padovan return; 63330a708f8fSGustavo F. Padovan 63340a708f8fSGustavo F. Padovan if (encrypt == 0x00) { 63354343478fSGustavo F. Padovan if (chan->sec_level == BT_SECURITY_MEDIUM) { 6336ba13ccd9SMarcel Holtmann __set_chan_timer(chan, L2CAP_ENC_TIMEOUT); 63374343478fSGustavo F. Padovan } else if (chan->sec_level == BT_SECURITY_HIGH) 63380f852724SGustavo F. Padovan l2cap_chan_close(chan, ECONNREFUSED); 63390a708f8fSGustavo F. Padovan } else { 63404343478fSGustavo F. Padovan if (chan->sec_level == BT_SECURITY_MEDIUM) 6341c9b66675SGustavo F. Padovan __clear_chan_timer(chan); 63420a708f8fSGustavo F. Padovan } 63430a708f8fSGustavo F. Padovan } 63440a708f8fSGustavo F. Padovan 6345686ebf28SUlisses Furquim int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) 63460a708f8fSGustavo F. Padovan { 63470a708f8fSGustavo F. Padovan struct l2cap_conn *conn = hcon->l2cap_data; 634848454079SGustavo F. Padovan struct l2cap_chan *chan; 63490a708f8fSGustavo F. Padovan 63500a708f8fSGustavo F. Padovan if (!conn) 63510a708f8fSGustavo F. Padovan return 0; 63520a708f8fSGustavo F. Padovan 635389d8b407SAndrei Emeltchenko BT_DBG("conn %p status 0x%2.2x encrypt %u", conn, status, encrypt); 63540a708f8fSGustavo F. Padovan 6355160dc6acSVinicius Costa Gomes if (hcon->type == LE_LINK) { 635635d4adccSHemant Gupta if (!status && encrypt) 6357160dc6acSVinicius Costa Gomes smp_distribute_keys(conn, 0); 635817cd3f37SUlisses Furquim cancel_delayed_work(&conn->security_timer); 6359160dc6acSVinicius Costa Gomes } 6360160dc6acSVinicius Costa Gomes 63613df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 63620a708f8fSGustavo F. Padovan 63633df91ea2SAndrei Emeltchenko list_for_each_entry(chan, &conn->chan_l, list) { 63646be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 63650a708f8fSGustavo F. Padovan 636689d8b407SAndrei Emeltchenko BT_DBG("chan %p scid 0x%4.4x state %s", chan, chan->scid, 636789d8b407SAndrei Emeltchenko state_to_string(chan->state)); 6368f1cb9af5SVinicius Costa Gomes 636978eb2f98SAndrei Emeltchenko if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) { 637078eb2f98SAndrei Emeltchenko l2cap_chan_unlock(chan); 637178eb2f98SAndrei Emeltchenko continue; 637278eb2f98SAndrei Emeltchenko } 637378eb2f98SAndrei Emeltchenko 6374f1cb9af5SVinicius Costa Gomes if (chan->scid == L2CAP_CID_LE_DATA) { 6375f1cb9af5SVinicius Costa Gomes if (!status && encrypt) { 6376f1cb9af5SVinicius Costa Gomes chan->sec_level = hcon->sec_level; 6377cf4cd009SAndrei Emeltchenko l2cap_chan_ready(chan); 6378f1cb9af5SVinicius Costa Gomes } 6379f1cb9af5SVinicius Costa Gomes 63806be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 6381f1cb9af5SVinicius Costa Gomes continue; 6382f1cb9af5SVinicius Costa Gomes } 6383f1cb9af5SVinicius Costa Gomes 638496eff46eSAndrei Emeltchenko if (!__l2cap_no_conn_pending(chan)) { 63856be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 63860a708f8fSGustavo F. Padovan continue; 63870a708f8fSGustavo F. Padovan } 63880a708f8fSGustavo F. Padovan 638989bc500eSGustavo F. Padovan if (!status && (chan->state == BT_CONNECTED || 639089bc500eSGustavo F. Padovan chan->state == BT_CONFIG)) { 6391a7d7723aSGustavo Padovan struct sock *sk = chan->sk; 6392a7d7723aSGustavo Padovan 6393c5daa683SGustavo Padovan clear_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags); 6394a7d7723aSGustavo Padovan sk->sk_state_change(sk); 6395a7d7723aSGustavo Padovan 63964343478fSGustavo F. Padovan l2cap_check_encryption(chan, encrypt); 63976be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 63980a708f8fSGustavo F. Padovan continue; 63990a708f8fSGustavo F. Padovan } 64000a708f8fSGustavo F. Padovan 640189bc500eSGustavo F. Padovan if (chan->state == BT_CONNECT) { 64020a708f8fSGustavo F. Padovan if (!status) { 640393c3e8f5SAndrei Emeltchenko l2cap_start_connection(chan); 64040a708f8fSGustavo F. Padovan } else { 6405ba13ccd9SMarcel Holtmann __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); 64060a708f8fSGustavo F. Padovan } 640789bc500eSGustavo F. Padovan } else if (chan->state == BT_CONNECT2) { 64086be36555SAndrei Emeltchenko struct sock *sk = chan->sk; 64090a708f8fSGustavo F. Padovan struct l2cap_conn_rsp rsp; 6410df3c3931SJohan Hedberg __u16 res, stat; 64110a708f8fSGustavo F. Padovan 64126be36555SAndrei Emeltchenko lock_sock(sk); 64136be36555SAndrei Emeltchenko 64140a708f8fSGustavo F. Padovan if (!status) { 6415c5daa683SGustavo Padovan if (test_bit(BT_SK_DEFER_SETUP, 6416c5daa683SGustavo Padovan &bt_sk(sk)->flags)) { 6417df3c3931SJohan Hedberg res = L2CAP_CR_PEND; 6418df3c3931SJohan Hedberg stat = L2CAP_CS_AUTHOR_PEND; 64192dc4e510SGustavo Padovan chan->ops->defer(chan); 6420df3c3931SJohan Hedberg } else { 64210e587be7SAndrei Emeltchenko __l2cap_state_change(chan, BT_CONFIG); 6422df3c3931SJohan Hedberg res = L2CAP_CR_SUCCESS; 6423df3c3931SJohan Hedberg stat = L2CAP_CS_NO_INFO; 6424df3c3931SJohan Hedberg } 64250a708f8fSGustavo F. Padovan } else { 64260e587be7SAndrei Emeltchenko __l2cap_state_change(chan, BT_DISCONN); 6427ba13ccd9SMarcel Holtmann __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); 6428df3c3931SJohan Hedberg res = L2CAP_CR_SEC_BLOCK; 6429df3c3931SJohan Hedberg stat = L2CAP_CS_NO_INFO; 64300a708f8fSGustavo F. Padovan } 64310a708f8fSGustavo F. Padovan 64326be36555SAndrei Emeltchenko release_sock(sk); 64336be36555SAndrei Emeltchenko 6434fe4128e0SGustavo F. Padovan rsp.scid = cpu_to_le16(chan->dcid); 6435fe4128e0SGustavo F. Padovan rsp.dcid = cpu_to_le16(chan->scid); 6436df3c3931SJohan Hedberg rsp.result = cpu_to_le16(res); 6437df3c3931SJohan Hedberg rsp.status = cpu_to_le16(stat); 6438fc7f8a7eSGustavo F. Padovan l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, 6439fc7f8a7eSGustavo F. Padovan sizeof(rsp), &rsp); 64402d369359SMat Martineau 64412d369359SMat Martineau if (!test_bit(CONF_REQ_SENT, &chan->conf_state) && 64422d369359SMat Martineau res == L2CAP_CR_SUCCESS) { 64432d369359SMat Martineau char buf[128]; 64442d369359SMat Martineau set_bit(CONF_REQ_SENT, &chan->conf_state); 64452d369359SMat Martineau l2cap_send_cmd(conn, l2cap_get_ident(conn), 64462d369359SMat Martineau L2CAP_CONF_REQ, 64472d369359SMat Martineau l2cap_build_conf_req(chan, buf), 64482d369359SMat Martineau buf); 64492d369359SMat Martineau chan->num_conf_req++; 64502d369359SMat Martineau } 64510a708f8fSGustavo F. Padovan } 64520a708f8fSGustavo F. Padovan 64536be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 64540a708f8fSGustavo F. Padovan } 64550a708f8fSGustavo F. Padovan 64563df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 64570a708f8fSGustavo F. Padovan 64580a708f8fSGustavo F. Padovan return 0; 64590a708f8fSGustavo F. Padovan } 64600a708f8fSGustavo F. Padovan 6461686ebf28SUlisses Furquim int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) 64620a708f8fSGustavo F. Padovan { 64630a708f8fSGustavo F. Padovan struct l2cap_conn *conn = hcon->l2cap_data; 6464d73a0988SAndrei Emeltchenko struct l2cap_hdr *hdr; 6465d73a0988SAndrei Emeltchenko int len; 64660a708f8fSGustavo F. Padovan 64671d13a254SAndrei Emeltchenko /* For AMP controller do not create l2cap conn */ 64681d13a254SAndrei Emeltchenko if (!conn && hcon->hdev->dev_type != HCI_BREDR) 64691d13a254SAndrei Emeltchenko goto drop; 64700a708f8fSGustavo F. Padovan 64710a708f8fSGustavo F. Padovan if (!conn) 64720a708f8fSGustavo F. Padovan conn = l2cap_conn_add(hcon, 0); 64730a708f8fSGustavo F. Padovan 64740a708f8fSGustavo F. Padovan if (!conn) 64750a708f8fSGustavo F. Padovan goto drop; 64760a708f8fSGustavo F. Padovan 64770a708f8fSGustavo F. Padovan BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); 64780a708f8fSGustavo F. Padovan 6479d73a0988SAndrei Emeltchenko switch (flags) { 6480d73a0988SAndrei Emeltchenko case ACL_START: 6481d73a0988SAndrei Emeltchenko case ACL_START_NO_FLUSH: 6482d73a0988SAndrei Emeltchenko case ACL_COMPLETE: 64830a708f8fSGustavo F. Padovan if (conn->rx_len) { 64840a708f8fSGustavo F. Padovan BT_ERR("Unexpected start frame (len %d)", skb->len); 64850a708f8fSGustavo F. Padovan kfree_skb(conn->rx_skb); 64860a708f8fSGustavo F. Padovan conn->rx_skb = NULL; 64870a708f8fSGustavo F. Padovan conn->rx_len = 0; 64880a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 64890a708f8fSGustavo F. Padovan } 64900a708f8fSGustavo F. Padovan 64910a708f8fSGustavo F. Padovan /* Start fragment always begin with Basic L2CAP header */ 64920a708f8fSGustavo F. Padovan if (skb->len < L2CAP_HDR_SIZE) { 64930a708f8fSGustavo F. Padovan BT_ERR("Frame is too short (len %d)", skb->len); 64940a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 64950a708f8fSGustavo F. Padovan goto drop; 64960a708f8fSGustavo F. Padovan } 64970a708f8fSGustavo F. Padovan 64980a708f8fSGustavo F. Padovan hdr = (struct l2cap_hdr *) skb->data; 64990a708f8fSGustavo F. Padovan len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; 65000a708f8fSGustavo F. Padovan 65010a708f8fSGustavo F. Padovan if (len == skb->len) { 65020a708f8fSGustavo F. Padovan /* Complete frame received */ 65030a708f8fSGustavo F. Padovan l2cap_recv_frame(conn, skb); 65040a708f8fSGustavo F. Padovan return 0; 65050a708f8fSGustavo F. Padovan } 65060a708f8fSGustavo F. Padovan 65070a708f8fSGustavo F. Padovan BT_DBG("Start: total len %d, frag len %d", len, skb->len); 65080a708f8fSGustavo F. Padovan 65090a708f8fSGustavo F. Padovan if (skb->len > len) { 65100a708f8fSGustavo F. Padovan BT_ERR("Frame is too long (len %d, expected len %d)", 65110a708f8fSGustavo F. Padovan skb->len, len); 65120a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 65130a708f8fSGustavo F. Padovan goto drop; 65140a708f8fSGustavo F. Padovan } 65150a708f8fSGustavo F. Padovan 65160a708f8fSGustavo F. Padovan /* Allocate skb for the complete frame (with header) */ 65178bcde1f2SGustavo Padovan conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL); 65180a708f8fSGustavo F. Padovan if (!conn->rx_skb) 65190a708f8fSGustavo F. Padovan goto drop; 65200a708f8fSGustavo F. Padovan 65210a708f8fSGustavo F. Padovan skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), 65220a708f8fSGustavo F. Padovan skb->len); 65230a708f8fSGustavo F. Padovan conn->rx_len = len - skb->len; 6524d73a0988SAndrei Emeltchenko break; 6525d73a0988SAndrei Emeltchenko 6526d73a0988SAndrei Emeltchenko case ACL_CONT: 65270a708f8fSGustavo F. Padovan BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); 65280a708f8fSGustavo F. Padovan 65290a708f8fSGustavo F. Padovan if (!conn->rx_len) { 65300a708f8fSGustavo F. Padovan BT_ERR("Unexpected continuation frame (len %d)", skb->len); 65310a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 65320a708f8fSGustavo F. Padovan goto drop; 65330a708f8fSGustavo F. Padovan } 65340a708f8fSGustavo F. Padovan 65350a708f8fSGustavo F. Padovan if (skb->len > conn->rx_len) { 65360a708f8fSGustavo F. Padovan BT_ERR("Fragment is too long (len %d, expected %d)", 65370a708f8fSGustavo F. Padovan skb->len, conn->rx_len); 65380a708f8fSGustavo F. Padovan kfree_skb(conn->rx_skb); 65390a708f8fSGustavo F. Padovan conn->rx_skb = NULL; 65400a708f8fSGustavo F. Padovan conn->rx_len = 0; 65410a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 65420a708f8fSGustavo F. Padovan goto drop; 65430a708f8fSGustavo F. Padovan } 65440a708f8fSGustavo F. Padovan 65450a708f8fSGustavo F. Padovan skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), 65460a708f8fSGustavo F. Padovan skb->len); 65470a708f8fSGustavo F. Padovan conn->rx_len -= skb->len; 65480a708f8fSGustavo F. Padovan 65490a708f8fSGustavo F. Padovan if (!conn->rx_len) { 65500a708f8fSGustavo F. Padovan /* Complete frame received */ 65510a708f8fSGustavo F. Padovan l2cap_recv_frame(conn, conn->rx_skb); 65520a708f8fSGustavo F. Padovan conn->rx_skb = NULL; 65530a708f8fSGustavo F. Padovan } 6554d73a0988SAndrei Emeltchenko break; 65550a708f8fSGustavo F. Padovan } 65560a708f8fSGustavo F. Padovan 65570a708f8fSGustavo F. Padovan drop: 65580a708f8fSGustavo F. Padovan kfree_skb(skb); 65590a708f8fSGustavo F. Padovan return 0; 65600a708f8fSGustavo F. Padovan } 65610a708f8fSGustavo F. Padovan 65620a708f8fSGustavo F. Padovan static int l2cap_debugfs_show(struct seq_file *f, void *p) 65630a708f8fSGustavo F. Padovan { 656423691d75SGustavo F. Padovan struct l2cap_chan *c; 65650a708f8fSGustavo F. Padovan 6566333055f2SGustavo F. Padovan read_lock(&chan_list_lock); 65670a708f8fSGustavo F. Padovan 656823691d75SGustavo F. Padovan list_for_each_entry(c, &chan_list, global_l) { 656923691d75SGustavo F. Padovan struct sock *sk = c->sk; 65700a708f8fSGustavo F. Padovan 6571fcb73338SAndrei Emeltchenko seq_printf(f, "%pMR %pMR %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", 6572fcb73338SAndrei Emeltchenko &bt_sk(sk)->src, &bt_sk(sk)->dst, 657389bc500eSGustavo F. Padovan c->state, __le16_to_cpu(c->psm), 657423691d75SGustavo F. Padovan c->scid, c->dcid, c->imtu, c->omtu, 657523691d75SGustavo F. Padovan c->sec_level, c->mode); 65760a708f8fSGustavo F. Padovan } 65770a708f8fSGustavo F. Padovan 6578333055f2SGustavo F. Padovan read_unlock(&chan_list_lock); 65790a708f8fSGustavo F. Padovan 65800a708f8fSGustavo F. Padovan return 0; 65810a708f8fSGustavo F. Padovan } 65820a708f8fSGustavo F. Padovan 65830a708f8fSGustavo F. Padovan static int l2cap_debugfs_open(struct inode *inode, struct file *file) 65840a708f8fSGustavo F. Padovan { 65850a708f8fSGustavo F. Padovan return single_open(file, l2cap_debugfs_show, inode->i_private); 65860a708f8fSGustavo F. Padovan } 65870a708f8fSGustavo F. Padovan 65880a708f8fSGustavo F. Padovan static const struct file_operations l2cap_debugfs_fops = { 65890a708f8fSGustavo F. Padovan .open = l2cap_debugfs_open, 65900a708f8fSGustavo F. Padovan .read = seq_read, 65910a708f8fSGustavo F. Padovan .llseek = seq_lseek, 65920a708f8fSGustavo F. Padovan .release = single_release, 65930a708f8fSGustavo F. Padovan }; 65940a708f8fSGustavo F. Padovan 65950a708f8fSGustavo F. Padovan static struct dentry *l2cap_debugfs; 65960a708f8fSGustavo F. Padovan 659764274518SGustavo F. Padovan int __init l2cap_init(void) 65980a708f8fSGustavo F. Padovan { 65990a708f8fSGustavo F. Padovan int err; 66000a708f8fSGustavo F. Padovan 6601bb58f747SGustavo F. Padovan err = l2cap_init_sockets(); 66020a708f8fSGustavo F. Padovan if (err < 0) 66030a708f8fSGustavo F. Padovan return err; 66040a708f8fSGustavo F. Padovan 66050a708f8fSGustavo F. Padovan if (bt_debugfs) { 66062d792818SGustavo Padovan l2cap_debugfs = debugfs_create_file("l2cap", 0444, bt_debugfs, 66072d792818SGustavo Padovan NULL, &l2cap_debugfs_fops); 66080a708f8fSGustavo F. Padovan if (!l2cap_debugfs) 66090a708f8fSGustavo F. Padovan BT_ERR("Failed to create L2CAP debug file"); 66100a708f8fSGustavo F. Padovan } 66110a708f8fSGustavo F. Padovan 66120a708f8fSGustavo F. Padovan return 0; 66130a708f8fSGustavo F. Padovan } 66140a708f8fSGustavo F. Padovan 661564274518SGustavo F. Padovan void l2cap_exit(void) 66160a708f8fSGustavo F. Padovan { 66170a708f8fSGustavo F. Padovan debugfs_remove(l2cap_debugfs); 6618bb58f747SGustavo F. Padovan l2cap_cleanup_sockets(); 66190a708f8fSGustavo F. Padovan } 66200a708f8fSGustavo F. Padovan 66210a708f8fSGustavo F. Padovan module_param(disable_ertm, bool, 0644); 66220a708f8fSGustavo F. Padovan MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); 6623