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> 410a708f8fSGustavo F. Padovan 42d1de6d46SMat Martineau bool disable_ertm; 430a708f8fSGustavo F. Padovan 440a708f8fSGustavo F. Padovan static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN; 4550a147cdSMat Martineau static u8 l2cap_fixed_chan[8] = { L2CAP_FC_L2CAP, }; 460a708f8fSGustavo F. Padovan 47b5ad8b7fSJohannes Berg static LIST_HEAD(chan_list); 48b5ad8b7fSJohannes Berg static DEFINE_RWLOCK(chan_list_lock); 490a708f8fSGustavo F. Padovan 500a708f8fSGustavo F. Padovan static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, 510a708f8fSGustavo F. Padovan u8 code, u8 ident, u16 dlen, void *data); 524519de9aSGustavo F. Padovan static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, 534519de9aSGustavo F. Padovan void *data); 54710f9b0aSGustavo F. Padovan static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data); 554519de9aSGustavo F. Padovan static void l2cap_send_disconn_req(struct l2cap_conn *conn, 564519de9aSGustavo F. Padovan 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 1032d792818SGustavo Padovan static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, 1042d792818SGustavo Padovan u8 ident) 1050a708f8fSGustavo F. Padovan { 1063df91ea2SAndrei Emeltchenko struct l2cap_chan *c; 107baa7e1faSGustavo F. Padovan 1083df91ea2SAndrei Emeltchenko list_for_each_entry(c, &conn->chan_l, list) { 1093df91ea2SAndrei Emeltchenko if (c->ident == ident) 1103df91ea2SAndrei Emeltchenko return c; 1110a708f8fSGustavo F. Padovan } 1123df91ea2SAndrei Emeltchenko return NULL; 113baa7e1faSGustavo F. Padovan } 1140a708f8fSGustavo F. Padovan 11523691d75SGustavo F. Padovan static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src) 1169e4425ffSGustavo F. Padovan { 11723691d75SGustavo F. Padovan struct l2cap_chan *c; 1189e4425ffSGustavo F. Padovan 11923691d75SGustavo F. Padovan list_for_each_entry(c, &chan_list, global_l) { 12023691d75SGustavo F. Padovan if (c->sport == psm && !bacmp(&bt_sk(c->sk)->src, src)) 12123691d75SGustavo F. Padovan return c; 1229e4425ffSGustavo F. Padovan } 123250938cbSSzymon Janc return NULL; 124250938cbSSzymon Janc } 1259e4425ffSGustavo F. Padovan 1269e4425ffSGustavo F. Padovan int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm) 1279e4425ffSGustavo F. Padovan { 12873b2ec18SGustavo F. Padovan int err; 12973b2ec18SGustavo F. Padovan 130333055f2SGustavo F. Padovan write_lock(&chan_list_lock); 1319e4425ffSGustavo F. Padovan 13223691d75SGustavo F. Padovan if (psm && __l2cap_global_chan_by_addr(psm, src)) { 13373b2ec18SGustavo F. Padovan err = -EADDRINUSE; 13473b2ec18SGustavo F. Padovan goto done; 1359e4425ffSGustavo F. Padovan } 1369e4425ffSGustavo F. Padovan 13773b2ec18SGustavo F. Padovan if (psm) { 1389e4425ffSGustavo F. Padovan chan->psm = psm; 1399e4425ffSGustavo F. Padovan chan->sport = psm; 14073b2ec18SGustavo F. Padovan err = 0; 14173b2ec18SGustavo F. Padovan } else { 14273b2ec18SGustavo F. Padovan u16 p; 1439e4425ffSGustavo F. Padovan 14473b2ec18SGustavo F. Padovan err = -EINVAL; 14573b2ec18SGustavo F. Padovan for (p = 0x1001; p < 0x1100; p += 2) 14623691d75SGustavo F. Padovan if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) { 14773b2ec18SGustavo F. Padovan chan->psm = cpu_to_le16(p); 14873b2ec18SGustavo F. Padovan chan->sport = cpu_to_le16(p); 14973b2ec18SGustavo F. Padovan err = 0; 15073b2ec18SGustavo F. Padovan break; 15173b2ec18SGustavo F. Padovan } 15273b2ec18SGustavo F. Padovan } 15373b2ec18SGustavo F. Padovan 15473b2ec18SGustavo F. Padovan done: 155333055f2SGustavo F. Padovan write_unlock(&chan_list_lock); 15673b2ec18SGustavo F. Padovan return err; 1579e4425ffSGustavo F. Padovan } 1589e4425ffSGustavo F. Padovan 1599e4425ffSGustavo F. Padovan int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid) 1609e4425ffSGustavo F. Padovan { 161333055f2SGustavo F. Padovan write_lock(&chan_list_lock); 1629e4425ffSGustavo F. Padovan 1639e4425ffSGustavo F. Padovan chan->scid = scid; 1649e4425ffSGustavo F. Padovan 165333055f2SGustavo F. Padovan write_unlock(&chan_list_lock); 1669e4425ffSGustavo F. Padovan 1679e4425ffSGustavo F. Padovan return 0; 1689e4425ffSGustavo F. Padovan } 1699e4425ffSGustavo F. Padovan 170baa7e1faSGustavo F. Padovan static u16 l2cap_alloc_cid(struct l2cap_conn *conn) 1710a708f8fSGustavo F. Padovan { 1720a708f8fSGustavo F. Padovan u16 cid = L2CAP_CID_DYN_START; 1730a708f8fSGustavo F. Padovan 1740a708f8fSGustavo F. Padovan for (; cid < L2CAP_CID_DYN_END; cid++) { 175baa7e1faSGustavo F. Padovan if (!__l2cap_get_chan_by_scid(conn, cid)) 1760a708f8fSGustavo F. Padovan return cid; 1770a708f8fSGustavo F. Padovan } 1780a708f8fSGustavo F. Padovan 1790a708f8fSGustavo F. Padovan return 0; 1800a708f8fSGustavo F. Padovan } 1810a708f8fSGustavo F. Padovan 1820e587be7SAndrei Emeltchenko static void __l2cap_state_change(struct l2cap_chan *chan, int state) 18389bc500eSGustavo F. Padovan { 18442d2d87cSAndrei Emeltchenko BT_DBG("chan %p %s -> %s", chan, state_to_string(chan->state), 185badaaa00SGustavo F. Padovan state_to_string(state)); 186badaaa00SGustavo F. Padovan 18789bc500eSGustavo F. Padovan chan->state = state; 18880b98027SGustavo Padovan chan->ops->state_change(chan, state); 18989bc500eSGustavo F. Padovan } 19089bc500eSGustavo F. Padovan 1910e587be7SAndrei Emeltchenko static void l2cap_state_change(struct l2cap_chan *chan, int state) 1920e587be7SAndrei Emeltchenko { 1930e587be7SAndrei Emeltchenko struct sock *sk = chan->sk; 1940e587be7SAndrei Emeltchenko 1950e587be7SAndrei Emeltchenko lock_sock(sk); 1960e587be7SAndrei Emeltchenko __l2cap_state_change(chan, state); 1970e587be7SAndrei Emeltchenko release_sock(sk); 1980e587be7SAndrei Emeltchenko } 1990e587be7SAndrei Emeltchenko 2002e0052e4SAndrei Emeltchenko static inline void __l2cap_chan_set_err(struct l2cap_chan *chan, int err) 2012e0052e4SAndrei Emeltchenko { 2022e0052e4SAndrei Emeltchenko struct sock *sk = chan->sk; 2032e0052e4SAndrei Emeltchenko 2042e0052e4SAndrei Emeltchenko sk->sk_err = err; 2052e0052e4SAndrei Emeltchenko } 2062e0052e4SAndrei Emeltchenko 2072e0052e4SAndrei Emeltchenko static inline void l2cap_chan_set_err(struct l2cap_chan *chan, int err) 2082e0052e4SAndrei Emeltchenko { 2092e0052e4SAndrei Emeltchenko struct sock *sk = chan->sk; 2102e0052e4SAndrei Emeltchenko 2112e0052e4SAndrei Emeltchenko lock_sock(sk); 2122e0052e4SAndrei Emeltchenko __l2cap_chan_set_err(chan, err); 2132e0052e4SAndrei Emeltchenko release_sock(sk); 2142e0052e4SAndrei Emeltchenko } 2152e0052e4SAndrei Emeltchenko 2164239d16fSMat Martineau static void __set_retrans_timer(struct l2cap_chan *chan) 2174239d16fSMat Martineau { 2184239d16fSMat Martineau if (!delayed_work_pending(&chan->monitor_timer) && 2194239d16fSMat Martineau chan->retrans_timeout) { 2204239d16fSMat Martineau l2cap_set_timer(chan, &chan->retrans_timer, 2214239d16fSMat Martineau msecs_to_jiffies(chan->retrans_timeout)); 2224239d16fSMat Martineau } 2234239d16fSMat Martineau } 2244239d16fSMat Martineau 2254239d16fSMat Martineau static void __set_monitor_timer(struct l2cap_chan *chan) 2264239d16fSMat Martineau { 2274239d16fSMat Martineau __clear_retrans_timer(chan); 2284239d16fSMat Martineau if (chan->monitor_timeout) { 2294239d16fSMat Martineau l2cap_set_timer(chan, &chan->monitor_timer, 2304239d16fSMat Martineau msecs_to_jiffies(chan->monitor_timeout)); 2314239d16fSMat Martineau } 2324239d16fSMat Martineau } 2334239d16fSMat Martineau 234608bcc6dSMat Martineau static struct sk_buff *l2cap_ertm_seq_in_queue(struct sk_buff_head *head, 235608bcc6dSMat Martineau u16 seq) 236608bcc6dSMat Martineau { 237608bcc6dSMat Martineau struct sk_buff *skb; 238608bcc6dSMat Martineau 239608bcc6dSMat Martineau skb_queue_walk(head, skb) { 240608bcc6dSMat Martineau if (bt_cb(skb)->control.txseq == seq) 241608bcc6dSMat Martineau return skb; 242608bcc6dSMat Martineau } 243608bcc6dSMat Martineau 244608bcc6dSMat Martineau return NULL; 245608bcc6dSMat Martineau } 246608bcc6dSMat Martineau 2473c588192SMat Martineau /* ---- L2CAP sequence number lists ---- */ 2483c588192SMat Martineau 2493c588192SMat Martineau /* For ERTM, ordered lists of sequence numbers must be tracked for 2503c588192SMat Martineau * SREJ requests that are received and for frames that are to be 2513c588192SMat Martineau * retransmitted. These seq_list functions implement a singly-linked 2523c588192SMat Martineau * list in an array, where membership in the list can also be checked 2533c588192SMat Martineau * in constant time. Items can also be added to the tail of the list 2543c588192SMat Martineau * and removed from the head in constant time, without further memory 2553c588192SMat Martineau * allocs or frees. 2563c588192SMat Martineau */ 2573c588192SMat Martineau 2583c588192SMat Martineau static int l2cap_seq_list_init(struct l2cap_seq_list *seq_list, u16 size) 2593c588192SMat Martineau { 2603c588192SMat Martineau size_t alloc_size, i; 2613c588192SMat Martineau 2623c588192SMat Martineau /* Allocated size is a power of 2 to map sequence numbers 2633c588192SMat Martineau * (which may be up to 14 bits) in to a smaller array that is 2643c588192SMat Martineau * sized for the negotiated ERTM transmit windows. 2653c588192SMat Martineau */ 2663c588192SMat Martineau alloc_size = roundup_pow_of_two(size); 2673c588192SMat Martineau 2683c588192SMat Martineau seq_list->list = kmalloc(sizeof(u16) * alloc_size, GFP_KERNEL); 2693c588192SMat Martineau if (!seq_list->list) 2703c588192SMat Martineau return -ENOMEM; 2713c588192SMat Martineau 2723c588192SMat Martineau seq_list->mask = alloc_size - 1; 2733c588192SMat Martineau seq_list->head = L2CAP_SEQ_LIST_CLEAR; 2743c588192SMat Martineau seq_list->tail = L2CAP_SEQ_LIST_CLEAR; 2753c588192SMat Martineau for (i = 0; i < alloc_size; i++) 2763c588192SMat Martineau seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; 2773c588192SMat Martineau 2783c588192SMat Martineau return 0; 2793c588192SMat Martineau } 2803c588192SMat Martineau 2813c588192SMat Martineau static inline void l2cap_seq_list_free(struct l2cap_seq_list *seq_list) 2823c588192SMat Martineau { 2833c588192SMat Martineau kfree(seq_list->list); 2843c588192SMat Martineau } 2853c588192SMat Martineau 2863c588192SMat Martineau static inline bool l2cap_seq_list_contains(struct l2cap_seq_list *seq_list, 2873c588192SMat Martineau u16 seq) 2883c588192SMat Martineau { 2893c588192SMat Martineau /* Constant-time check for list membership */ 2903c588192SMat Martineau return seq_list->list[seq & seq_list->mask] != L2CAP_SEQ_LIST_CLEAR; 2913c588192SMat Martineau } 2923c588192SMat Martineau 2933c588192SMat Martineau static u16 l2cap_seq_list_remove(struct l2cap_seq_list *seq_list, u16 seq) 2943c588192SMat Martineau { 2953c588192SMat Martineau u16 mask = seq_list->mask; 2963c588192SMat Martineau 2973c588192SMat Martineau if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) { 2983c588192SMat Martineau /* In case someone tries to pop the head of an empty list */ 2993c588192SMat Martineau return L2CAP_SEQ_LIST_CLEAR; 3003c588192SMat Martineau } else if (seq_list->head == seq) { 3013c588192SMat Martineau /* Head can be removed in constant time */ 3023c588192SMat Martineau seq_list->head = seq_list->list[seq & mask]; 3033c588192SMat Martineau seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR; 3043c588192SMat Martineau 3053c588192SMat Martineau if (seq_list->head == L2CAP_SEQ_LIST_TAIL) { 3063c588192SMat Martineau seq_list->head = L2CAP_SEQ_LIST_CLEAR; 3073c588192SMat Martineau seq_list->tail = L2CAP_SEQ_LIST_CLEAR; 3083c588192SMat Martineau } 3093c588192SMat Martineau } else { 3103c588192SMat Martineau /* Walk the list to find the sequence number */ 3113c588192SMat Martineau u16 prev = seq_list->head; 3123c588192SMat Martineau while (seq_list->list[prev & mask] != seq) { 3133c588192SMat Martineau prev = seq_list->list[prev & mask]; 3143c588192SMat Martineau if (prev == L2CAP_SEQ_LIST_TAIL) 3153c588192SMat Martineau return L2CAP_SEQ_LIST_CLEAR; 3163c588192SMat Martineau } 3173c588192SMat Martineau 3183c588192SMat Martineau /* Unlink the number from the list and clear it */ 3193c588192SMat Martineau seq_list->list[prev & mask] = seq_list->list[seq & mask]; 3203c588192SMat Martineau seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR; 3213c588192SMat Martineau if (seq_list->tail == seq) 3223c588192SMat Martineau seq_list->tail = prev; 3233c588192SMat Martineau } 3243c588192SMat Martineau return seq; 3253c588192SMat Martineau } 3263c588192SMat Martineau 3273c588192SMat Martineau static inline u16 l2cap_seq_list_pop(struct l2cap_seq_list *seq_list) 3283c588192SMat Martineau { 3293c588192SMat Martineau /* Remove the head in constant time */ 3303c588192SMat Martineau return l2cap_seq_list_remove(seq_list, seq_list->head); 3313c588192SMat Martineau } 3323c588192SMat Martineau 3333c588192SMat Martineau static void l2cap_seq_list_clear(struct l2cap_seq_list *seq_list) 3343c588192SMat Martineau { 3353c588192SMat Martineau u16 i; 336f522ae36SGustavo Padovan 337f522ae36SGustavo Padovan if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) 338f522ae36SGustavo Padovan return; 339f522ae36SGustavo Padovan 3403c588192SMat Martineau for (i = 0; i <= seq_list->mask; i++) 3413c588192SMat Martineau seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; 3423c588192SMat Martineau 3433c588192SMat Martineau seq_list->head = L2CAP_SEQ_LIST_CLEAR; 3443c588192SMat Martineau seq_list->tail = L2CAP_SEQ_LIST_CLEAR; 3453c588192SMat Martineau } 3463c588192SMat Martineau 3473c588192SMat Martineau static void l2cap_seq_list_append(struct l2cap_seq_list *seq_list, u16 seq) 3483c588192SMat Martineau { 3493c588192SMat Martineau u16 mask = seq_list->mask; 3503c588192SMat Martineau 3513c588192SMat Martineau /* All appends happen in constant time */ 3523c588192SMat Martineau 353f522ae36SGustavo Padovan if (seq_list->list[seq & mask] != L2CAP_SEQ_LIST_CLEAR) 354f522ae36SGustavo Padovan return; 355f522ae36SGustavo Padovan 3563c588192SMat Martineau if (seq_list->tail == L2CAP_SEQ_LIST_CLEAR) 3573c588192SMat Martineau seq_list->head = seq; 3583c588192SMat Martineau else 3593c588192SMat Martineau seq_list->list[seq_list->tail & mask] = seq; 3603c588192SMat Martineau 3613c588192SMat Martineau seq_list->tail = seq; 3623c588192SMat Martineau seq_list->list[seq & mask] = L2CAP_SEQ_LIST_TAIL; 3633c588192SMat Martineau } 3643c588192SMat Martineau 365721c4181SGustavo F. Padovan static void l2cap_chan_timeout(struct work_struct *work) 366ab07801dSGustavo F. Padovan { 367721c4181SGustavo F. Padovan struct l2cap_chan *chan = container_of(work, struct l2cap_chan, 368721c4181SGustavo F. Padovan chan_timer.work); 3693df91ea2SAndrei Emeltchenko struct l2cap_conn *conn = chan->conn; 370ab07801dSGustavo F. Padovan int reason; 371ab07801dSGustavo F. Padovan 372e05dcc32SAndrei Emeltchenko BT_DBG("chan %p state %s", chan, state_to_string(chan->state)); 373ab07801dSGustavo F. Padovan 3743df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 3756be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 376ab07801dSGustavo F. Padovan 37789bc500eSGustavo F. Padovan if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG) 378ab07801dSGustavo F. Padovan reason = ECONNREFUSED; 37989bc500eSGustavo F. Padovan else if (chan->state == BT_CONNECT && 380ab07801dSGustavo F. Padovan chan->sec_level != BT_SECURITY_SDP) 381ab07801dSGustavo F. Padovan reason = ECONNREFUSED; 382ab07801dSGustavo F. Padovan else 383ab07801dSGustavo F. Padovan reason = ETIMEDOUT; 384ab07801dSGustavo F. Padovan 3850f852724SGustavo F. Padovan l2cap_chan_close(chan, reason); 386ab07801dSGustavo F. Padovan 3876be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 388ab07801dSGustavo F. Padovan 38980b98027SGustavo Padovan chan->ops->close(chan); 3903df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 3913df91ea2SAndrei Emeltchenko 392371fd835SUlisses Furquim l2cap_chan_put(chan); 393ab07801dSGustavo F. Padovan } 394ab07801dSGustavo F. Padovan 395eef1d9b6SGustavo Padovan struct l2cap_chan *l2cap_chan_create(void) 3960a708f8fSGustavo F. Padovan { 39748454079SGustavo F. Padovan struct l2cap_chan *chan; 3980a708f8fSGustavo F. Padovan 39948454079SGustavo F. Padovan chan = kzalloc(sizeof(*chan), GFP_ATOMIC); 40048454079SGustavo F. Padovan if (!chan) 40148454079SGustavo F. Padovan return NULL; 4020a708f8fSGustavo F. Padovan 403c03b355eSAndrei Emeltchenko mutex_init(&chan->lock); 404c03b355eSAndrei Emeltchenko 405333055f2SGustavo F. Padovan write_lock(&chan_list_lock); 40623691d75SGustavo F. Padovan list_add(&chan->global_l, &chan_list); 407333055f2SGustavo F. Padovan write_unlock(&chan_list_lock); 40823691d75SGustavo F. Padovan 409721c4181SGustavo F. Padovan INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout); 410ab07801dSGustavo F. Padovan 41189bc500eSGustavo F. Padovan chan->state = BT_OPEN; 41289bc500eSGustavo F. Padovan 413144ad330SSyam Sidhardhan kref_init(&chan->kref); 41471ba0e56SGustavo F. Padovan 4152827011fSMat Martineau /* This flag is cleared in l2cap_chan_ready() */ 4162827011fSMat Martineau set_bit(CONF_NOT_COMPLETE, &chan->conf_state); 4172827011fSMat Martineau 418eef1d9b6SGustavo Padovan BT_DBG("chan %p", chan); 419abc545b8SSzymon Janc 42048454079SGustavo F. Padovan return chan; 4210a708f8fSGustavo F. Padovan } 4220a708f8fSGustavo F. Padovan 423144ad330SSyam Sidhardhan static void l2cap_chan_destroy(struct kref *kref) 4246ff5abbfSGustavo F. Padovan { 425144ad330SSyam Sidhardhan struct l2cap_chan *chan = container_of(kref, struct l2cap_chan, kref); 426144ad330SSyam Sidhardhan 4274af66c69SJaganath Kanakkassery BT_DBG("chan %p", chan); 4284af66c69SJaganath Kanakkassery 429333055f2SGustavo F. Padovan write_lock(&chan_list_lock); 43023691d75SGustavo F. Padovan list_del(&chan->global_l); 431333055f2SGustavo F. Padovan write_unlock(&chan_list_lock); 43223691d75SGustavo F. Padovan 4334af66c69SJaganath Kanakkassery kfree(chan); 4346ff5abbfSGustavo F. Padovan } 4356ff5abbfSGustavo F. Padovan 43630648372SJaganath Kanakkassery void l2cap_chan_hold(struct l2cap_chan *c) 43730648372SJaganath Kanakkassery { 438144ad330SSyam Sidhardhan BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount)); 43930648372SJaganath Kanakkassery 440144ad330SSyam Sidhardhan kref_get(&c->kref); 44130648372SJaganath Kanakkassery } 44230648372SJaganath Kanakkassery 44330648372SJaganath Kanakkassery void l2cap_chan_put(struct l2cap_chan *c) 44430648372SJaganath Kanakkassery { 445144ad330SSyam Sidhardhan BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount)); 44630648372SJaganath Kanakkassery 447144ad330SSyam Sidhardhan kref_put(&c->kref, l2cap_chan_destroy); 44830648372SJaganath Kanakkassery } 44930648372SJaganath Kanakkassery 450bd4b1653SAndrei Emeltchenko void l2cap_chan_set_defaults(struct l2cap_chan *chan) 451bd4b1653SAndrei Emeltchenko { 452bd4b1653SAndrei Emeltchenko chan->fcs = L2CAP_FCS_CRC16; 453bd4b1653SAndrei Emeltchenko chan->max_tx = L2CAP_DEFAULT_MAX_TX; 454bd4b1653SAndrei Emeltchenko chan->tx_win = L2CAP_DEFAULT_TX_WINDOW; 455bd4b1653SAndrei Emeltchenko chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; 456c20f8e35SMat Martineau chan->ack_win = L2CAP_DEFAULT_TX_WINDOW; 457bd4b1653SAndrei Emeltchenko chan->sec_level = BT_SECURITY_LOW; 458bd4b1653SAndrei Emeltchenko 459bd4b1653SAndrei Emeltchenko set_bit(FLAG_FORCE_ACTIVE, &chan->flags); 460bd4b1653SAndrei Emeltchenko } 461bd4b1653SAndrei Emeltchenko 46293c3e8f5SAndrei Emeltchenko void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) 4630a708f8fSGustavo F. Padovan { 4640a708f8fSGustavo F. Padovan BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, 465097db76cSAndrei Emeltchenko __le16_to_cpu(chan->psm), chan->dcid); 4660a708f8fSGustavo F. Padovan 4679f5a0d7bSAndrei Emeltchenko conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; 4680a708f8fSGustavo F. Padovan 4698c1d787bSGustavo F. Padovan chan->conn = conn; 4700a708f8fSGustavo F. Padovan 4715491120eSAndrei Emeltchenko switch (chan->chan_type) { 4725491120eSAndrei Emeltchenko case L2CAP_CHAN_CONN_ORIENTED: 473b62f328bSVille Tervo if (conn->hcon->type == LE_LINK) { 474b62f328bSVille Tervo /* LE connection */ 4756fcb06a2SAndre Guedes chan->omtu = L2CAP_DEFAULT_MTU; 476fe4128e0SGustavo F. Padovan chan->scid = L2CAP_CID_LE_DATA; 477fe4128e0SGustavo F. Padovan chan->dcid = L2CAP_CID_LE_DATA; 478b62f328bSVille Tervo } else { 4790a708f8fSGustavo F. Padovan /* Alloc CID for connection-oriented socket */ 480fe4128e0SGustavo F. Padovan chan->scid = l2cap_alloc_cid(conn); 4810c1bc5c6SGustavo F. Padovan chan->omtu = L2CAP_DEFAULT_MTU; 482b62f328bSVille Tervo } 4835491120eSAndrei Emeltchenko break; 4845491120eSAndrei Emeltchenko 4855491120eSAndrei Emeltchenko case L2CAP_CHAN_CONN_LESS: 4860a708f8fSGustavo F. Padovan /* Connectionless socket */ 487fe4128e0SGustavo F. Padovan chan->scid = L2CAP_CID_CONN_LESS; 488fe4128e0SGustavo F. Padovan chan->dcid = L2CAP_CID_CONN_LESS; 4890c1bc5c6SGustavo F. Padovan chan->omtu = L2CAP_DEFAULT_MTU; 4905491120eSAndrei Emeltchenko break; 4915491120eSAndrei Emeltchenko 492416fa752SAndrei Emeltchenko case L2CAP_CHAN_CONN_FIX_A2MP: 493416fa752SAndrei Emeltchenko chan->scid = L2CAP_CID_A2MP; 494416fa752SAndrei Emeltchenko chan->dcid = L2CAP_CID_A2MP; 495416fa752SAndrei Emeltchenko chan->omtu = L2CAP_A2MP_DEFAULT_MTU; 496416fa752SAndrei Emeltchenko chan->imtu = L2CAP_A2MP_DEFAULT_MTU; 497416fa752SAndrei Emeltchenko break; 498416fa752SAndrei Emeltchenko 4995491120eSAndrei Emeltchenko default: 5000a708f8fSGustavo F. Padovan /* Raw socket can send/recv signalling messages only */ 501fe4128e0SGustavo F. Padovan chan->scid = L2CAP_CID_SIGNALING; 502fe4128e0SGustavo F. Padovan chan->dcid = L2CAP_CID_SIGNALING; 5030c1bc5c6SGustavo F. Padovan chan->omtu = L2CAP_DEFAULT_MTU; 5040a708f8fSGustavo F. Padovan } 5050a708f8fSGustavo F. Padovan 5068f7975b1SAndrei Emeltchenko chan->local_id = L2CAP_BESTEFFORT_ID; 5078f7975b1SAndrei Emeltchenko chan->local_stype = L2CAP_SERV_BESTEFFORT; 5088f7975b1SAndrei Emeltchenko chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE; 5098f7975b1SAndrei Emeltchenko chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME; 5108f7975b1SAndrei Emeltchenko chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT; 5118936fa6dSAndrei Emeltchenko chan->local_flush_to = L2CAP_EFS_DEFAULT_FLUSH_TO; 5128f7975b1SAndrei Emeltchenko 513371fd835SUlisses Furquim l2cap_chan_hold(chan); 514baa7e1faSGustavo F. Padovan 5153df91ea2SAndrei Emeltchenko list_add(&chan->list, &conn->chan_l); 516643162a8SAndrei Emeltchenko } 517643162a8SAndrei Emeltchenko 518466f8004SAndrei Emeltchenko void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) 519643162a8SAndrei Emeltchenko { 520643162a8SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 521643162a8SAndrei Emeltchenko __l2cap_chan_add(conn, chan); 5223df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 5230a708f8fSGustavo F. Padovan } 5240a708f8fSGustavo F. Padovan 525466f8004SAndrei Emeltchenko void l2cap_chan_del(struct l2cap_chan *chan, int err) 5260a708f8fSGustavo F. Padovan { 5278c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 5280a708f8fSGustavo F. Padovan 529c9b66675SGustavo F. Padovan __clear_chan_timer(chan); 5300a708f8fSGustavo F. Padovan 53149208c9cSGustavo F. Padovan BT_DBG("chan %p, conn %p, err %d", chan, conn, err); 5320a708f8fSGustavo F. Padovan 5330a708f8fSGustavo F. Padovan if (conn) { 534baa7e1faSGustavo F. Padovan /* Delete from channel list */ 5353df91ea2SAndrei Emeltchenko list_del(&chan->list); 5363d57dc68SGustavo F. Padovan 537371fd835SUlisses Furquim l2cap_chan_put(chan); 538baa7e1faSGustavo F. Padovan 5398c1d787bSGustavo F. Padovan chan->conn = NULL; 5403cabbfdaSAndrei Emeltchenko 5413cabbfdaSAndrei Emeltchenko if (chan->chan_type != L2CAP_CHAN_CONN_FIX_A2MP) 5420a708f8fSGustavo F. Padovan hci_conn_put(conn->hcon); 5430a708f8fSGustavo F. Padovan } 5440a708f8fSGustavo F. Padovan 545c0df7f6eSAndrei Emeltchenko if (chan->ops->teardown) 546c0df7f6eSAndrei Emeltchenko chan->ops->teardown(chan, err); 5476be36555SAndrei Emeltchenko 5482827011fSMat Martineau if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state)) 5496ff5abbfSGustavo F. Padovan return; 5502ead70b8SGustavo F. Padovan 551ee556f66SGustavo Padovan switch(chan->mode) { 552ee556f66SGustavo Padovan case L2CAP_MODE_BASIC: 553ee556f66SGustavo Padovan break; 5540a708f8fSGustavo F. Padovan 555ee556f66SGustavo Padovan case L2CAP_MODE_ERTM: 5561a09bcb9SGustavo F. Padovan __clear_retrans_timer(chan); 5571a09bcb9SGustavo F. Padovan __clear_monitor_timer(chan); 5581a09bcb9SGustavo F. Padovan __clear_ack_timer(chan); 5590a708f8fSGustavo F. Padovan 560f1c6775bSGustavo F. Padovan skb_queue_purge(&chan->srej_q); 5610a708f8fSGustavo F. Padovan 5623c588192SMat Martineau l2cap_seq_list_free(&chan->srej_list); 5633c588192SMat Martineau l2cap_seq_list_free(&chan->retrans_list); 564ee556f66SGustavo Padovan 565ee556f66SGustavo Padovan /* fall through */ 566ee556f66SGustavo Padovan 567ee556f66SGustavo Padovan case L2CAP_MODE_STREAMING: 568ee556f66SGustavo Padovan skb_queue_purge(&chan->tx_q); 569ee556f66SGustavo Padovan break; 5700a708f8fSGustavo F. Padovan } 571ee556f66SGustavo Padovan 572ee556f66SGustavo Padovan return; 5730a708f8fSGustavo F. Padovan } 5740a708f8fSGustavo F. Padovan 5750f852724SGustavo F. Padovan void l2cap_chan_close(struct l2cap_chan *chan, int reason) 5764519de9aSGustavo F. Padovan { 5774519de9aSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 5784519de9aSGustavo F. Padovan struct sock *sk = chan->sk; 5794519de9aSGustavo F. Padovan 5802d792818SGustavo Padovan BT_DBG("chan %p state %s sk %p", chan, state_to_string(chan->state), 5812d792818SGustavo Padovan sk); 5824519de9aSGustavo F. Padovan 58389bc500eSGustavo F. Padovan switch (chan->state) { 5844519de9aSGustavo F. Padovan case BT_LISTEN: 585c0df7f6eSAndrei Emeltchenko if (chan->ops->teardown) 586c0df7f6eSAndrei Emeltchenko chan->ops->teardown(chan, 0); 5874519de9aSGustavo F. Padovan break; 5884519de9aSGustavo F. Padovan 5894519de9aSGustavo F. Padovan case BT_CONNECTED: 5904519de9aSGustavo F. Padovan case BT_CONFIG: 591715ec005SGustavo F. Padovan if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && 5924519de9aSGustavo F. Padovan conn->hcon->type == ACL_LINK) { 593c9b66675SGustavo F. Padovan __set_chan_timer(chan, sk->sk_sndtimeo); 5944519de9aSGustavo F. Padovan l2cap_send_disconn_req(conn, chan, reason); 5954519de9aSGustavo F. Padovan } else 5964519de9aSGustavo F. Padovan l2cap_chan_del(chan, reason); 5974519de9aSGustavo F. Padovan break; 5984519de9aSGustavo F. Padovan 5994519de9aSGustavo F. Padovan case BT_CONNECT2: 600715ec005SGustavo F. Padovan if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && 6014519de9aSGustavo F. Padovan conn->hcon->type == ACL_LINK) { 6024519de9aSGustavo F. Padovan struct l2cap_conn_rsp rsp; 6034519de9aSGustavo F. Padovan __u16 result; 6044519de9aSGustavo F. Padovan 605c5daa683SGustavo Padovan if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) 6064519de9aSGustavo F. Padovan result = L2CAP_CR_SEC_BLOCK; 6074519de9aSGustavo F. Padovan else 6084519de9aSGustavo F. Padovan result = L2CAP_CR_BAD_PSM; 60989bc500eSGustavo F. Padovan l2cap_state_change(chan, BT_DISCONN); 6104519de9aSGustavo F. Padovan 6114519de9aSGustavo F. Padovan rsp.scid = cpu_to_le16(chan->dcid); 6124519de9aSGustavo F. Padovan rsp.dcid = cpu_to_le16(chan->scid); 6134519de9aSGustavo F. Padovan rsp.result = cpu_to_le16(result); 614ac73498cSAndrei Emeltchenko rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); 6154519de9aSGustavo F. Padovan l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, 6164519de9aSGustavo F. Padovan sizeof(rsp), &rsp); 6174519de9aSGustavo F. Padovan } 6184519de9aSGustavo F. Padovan 6194519de9aSGustavo F. Padovan l2cap_chan_del(chan, reason); 6204519de9aSGustavo F. Padovan break; 6214519de9aSGustavo F. Padovan 6224519de9aSGustavo F. Padovan case BT_CONNECT: 6234519de9aSGustavo F. Padovan case BT_DISCONN: 6244519de9aSGustavo F. Padovan l2cap_chan_del(chan, reason); 6254519de9aSGustavo F. Padovan break; 6264519de9aSGustavo F. Padovan 6274519de9aSGustavo F. Padovan default: 628c0df7f6eSAndrei Emeltchenko if (chan->ops->teardown) 629c0df7f6eSAndrei Emeltchenko chan->ops->teardown(chan, 0); 6304519de9aSGustavo F. Padovan break; 6314519de9aSGustavo F. Padovan } 6324519de9aSGustavo F. Padovan } 6334519de9aSGustavo F. Padovan 6344343478fSGustavo F. Padovan static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan) 6350a708f8fSGustavo F. Padovan { 636715ec005SGustavo F. Padovan if (chan->chan_type == L2CAP_CHAN_RAW) { 6374343478fSGustavo F. Padovan switch (chan->sec_level) { 6380a708f8fSGustavo F. Padovan case BT_SECURITY_HIGH: 6390a708f8fSGustavo F. Padovan return HCI_AT_DEDICATED_BONDING_MITM; 6400a708f8fSGustavo F. Padovan case BT_SECURITY_MEDIUM: 6410a708f8fSGustavo F. Padovan return HCI_AT_DEDICATED_BONDING; 6420a708f8fSGustavo F. Padovan default: 6430a708f8fSGustavo F. Padovan return HCI_AT_NO_BONDING; 6440a708f8fSGustavo F. Padovan } 6452983fd68SAndrei Emeltchenko } else if (chan->psm == __constant_cpu_to_le16(L2CAP_PSM_SDP)) { 6464343478fSGustavo F. Padovan if (chan->sec_level == BT_SECURITY_LOW) 6474343478fSGustavo F. Padovan chan->sec_level = BT_SECURITY_SDP; 6480a708f8fSGustavo F. Padovan 6494343478fSGustavo F. Padovan if (chan->sec_level == BT_SECURITY_HIGH) 6500a708f8fSGustavo F. Padovan return HCI_AT_NO_BONDING_MITM; 6510a708f8fSGustavo F. Padovan else 6520a708f8fSGustavo F. Padovan return HCI_AT_NO_BONDING; 6530a708f8fSGustavo F. Padovan } else { 6544343478fSGustavo F. Padovan switch (chan->sec_level) { 6550a708f8fSGustavo F. Padovan case BT_SECURITY_HIGH: 6560a708f8fSGustavo F. Padovan return HCI_AT_GENERAL_BONDING_MITM; 6570a708f8fSGustavo F. Padovan case BT_SECURITY_MEDIUM: 6580a708f8fSGustavo F. Padovan return HCI_AT_GENERAL_BONDING; 6590a708f8fSGustavo F. Padovan default: 6600a708f8fSGustavo F. Padovan return HCI_AT_NO_BONDING; 6610a708f8fSGustavo F. Padovan } 6620a708f8fSGustavo F. Padovan } 6630a708f8fSGustavo F. Padovan } 6640a708f8fSGustavo F. Padovan 6650a708f8fSGustavo F. Padovan /* Service level security */ 666d45fc423SGustavo F. Padovan int l2cap_chan_check_security(struct l2cap_chan *chan) 6670a708f8fSGustavo F. Padovan { 6688c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 6690a708f8fSGustavo F. Padovan __u8 auth_type; 6700a708f8fSGustavo F. Padovan 6714343478fSGustavo F. Padovan auth_type = l2cap_get_auth_type(chan); 6720a708f8fSGustavo F. Padovan 6734343478fSGustavo F. Padovan return hci_conn_security(conn->hcon, chan->sec_level, auth_type); 6740a708f8fSGustavo F. Padovan } 6750a708f8fSGustavo F. Padovan 676b5ad8b7fSJohannes Berg static u8 l2cap_get_ident(struct l2cap_conn *conn) 6770a708f8fSGustavo F. Padovan { 6780a708f8fSGustavo F. Padovan u8 id; 6790a708f8fSGustavo F. Padovan 6800a708f8fSGustavo F. Padovan /* Get next available identificator. 6810a708f8fSGustavo F. Padovan * 1 - 128 are used by kernel. 6820a708f8fSGustavo F. Padovan * 129 - 199 are reserved. 6830a708f8fSGustavo F. Padovan * 200 - 254 are used by utilities like l2ping, etc. 6840a708f8fSGustavo F. Padovan */ 6850a708f8fSGustavo F. Padovan 686333055f2SGustavo F. Padovan spin_lock(&conn->lock); 6870a708f8fSGustavo F. Padovan 6880a708f8fSGustavo F. Padovan if (++conn->tx_ident > 128) 6890a708f8fSGustavo F. Padovan conn->tx_ident = 1; 6900a708f8fSGustavo F. Padovan 6910a708f8fSGustavo F. Padovan id = conn->tx_ident; 6920a708f8fSGustavo F. Padovan 693333055f2SGustavo F. Padovan spin_unlock(&conn->lock); 6940a708f8fSGustavo F. Padovan 6950a708f8fSGustavo F. Padovan return id; 6960a708f8fSGustavo F. Padovan } 6970a708f8fSGustavo F. Padovan 6982d792818SGustavo Padovan static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, 6992d792818SGustavo Padovan void *data) 7000a708f8fSGustavo F. Padovan { 7010a708f8fSGustavo F. Padovan struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); 7020a708f8fSGustavo F. Padovan u8 flags; 7030a708f8fSGustavo F. Padovan 7040a708f8fSGustavo F. Padovan BT_DBG("code 0x%2.2x", code); 7050a708f8fSGustavo F. Padovan 7060a708f8fSGustavo F. Padovan if (!skb) 7070a708f8fSGustavo F. Padovan return; 7080a708f8fSGustavo F. Padovan 7090a708f8fSGustavo F. Padovan if (lmp_no_flush_capable(conn->hcon->hdev)) 7100a708f8fSGustavo F. Padovan flags = ACL_START_NO_FLUSH; 7110a708f8fSGustavo F. Padovan else 7120a708f8fSGustavo F. Padovan flags = ACL_START; 7130a708f8fSGustavo F. Padovan 71414b12d0bSJaikumar Ganesh bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON; 7155e59b791SLuiz Augusto von Dentz skb->priority = HCI_PRIO_MAX; 71614b12d0bSJaikumar Ganesh 71773d80debSLuiz Augusto von Dentz hci_send_acl(conn->hchan, skb, flags); 7180a708f8fSGustavo F. Padovan } 7190a708f8fSGustavo F. Padovan 72073d80debSLuiz Augusto von Dentz static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb) 72173d80debSLuiz Augusto von Dentz { 72273d80debSLuiz Augusto von Dentz struct hci_conn *hcon = chan->conn->hcon; 72373d80debSLuiz Augusto von Dentz u16 flags; 72473d80debSLuiz Augusto von Dentz 72573d80debSLuiz Augusto von Dentz BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len, 72673d80debSLuiz Augusto von Dentz skb->priority); 72773d80debSLuiz Augusto von Dentz 72873d80debSLuiz Augusto von Dentz if (!test_bit(FLAG_FLUSHABLE, &chan->flags) && 72973d80debSLuiz Augusto von Dentz lmp_no_flush_capable(hcon->hdev)) 73073d80debSLuiz Augusto von Dentz flags = ACL_START_NO_FLUSH; 73173d80debSLuiz Augusto von Dentz else 73273d80debSLuiz Augusto von Dentz flags = ACL_START; 73373d80debSLuiz Augusto von Dentz 73473d80debSLuiz Augusto von Dentz bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags); 73573d80debSLuiz Augusto von Dentz hci_send_acl(chan->conn->hchan, skb, flags); 7360a708f8fSGustavo F. Padovan } 7370a708f8fSGustavo F. Padovan 738b5c6aaedSMat Martineau static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control) 739b5c6aaedSMat Martineau { 740b5c6aaedSMat Martineau control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT; 741b5c6aaedSMat Martineau control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT; 742b5c6aaedSMat Martineau 743b5c6aaedSMat Martineau if (enh & L2CAP_CTRL_FRAME_TYPE) { 744b5c6aaedSMat Martineau /* S-Frame */ 745b5c6aaedSMat Martineau control->sframe = 1; 746b5c6aaedSMat Martineau control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT; 747b5c6aaedSMat Martineau control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT; 748b5c6aaedSMat Martineau 749b5c6aaedSMat Martineau control->sar = 0; 750b5c6aaedSMat Martineau control->txseq = 0; 751b5c6aaedSMat Martineau } else { 752b5c6aaedSMat Martineau /* I-Frame */ 753b5c6aaedSMat Martineau control->sframe = 0; 754b5c6aaedSMat Martineau control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT; 755b5c6aaedSMat Martineau control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT; 756b5c6aaedSMat Martineau 757b5c6aaedSMat Martineau control->poll = 0; 758b5c6aaedSMat Martineau control->super = 0; 759b5c6aaedSMat Martineau } 760b5c6aaedSMat Martineau } 761b5c6aaedSMat Martineau 762b5c6aaedSMat Martineau static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control) 763b5c6aaedSMat Martineau { 764b5c6aaedSMat Martineau control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT; 765b5c6aaedSMat Martineau control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT; 766b5c6aaedSMat Martineau 767b5c6aaedSMat Martineau if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) { 768b5c6aaedSMat Martineau /* S-Frame */ 769b5c6aaedSMat Martineau control->sframe = 1; 770b5c6aaedSMat Martineau control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT; 771b5c6aaedSMat Martineau control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT; 772b5c6aaedSMat Martineau 773b5c6aaedSMat Martineau control->sar = 0; 774b5c6aaedSMat Martineau control->txseq = 0; 775b5c6aaedSMat Martineau } else { 776b5c6aaedSMat Martineau /* I-Frame */ 777b5c6aaedSMat Martineau control->sframe = 0; 778b5c6aaedSMat Martineau control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT; 779b5c6aaedSMat Martineau control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT; 780b5c6aaedSMat Martineau 781b5c6aaedSMat Martineau control->poll = 0; 782b5c6aaedSMat Martineau control->super = 0; 783b5c6aaedSMat Martineau } 784b5c6aaedSMat Martineau } 785b5c6aaedSMat Martineau 786b5c6aaedSMat Martineau static inline void __unpack_control(struct l2cap_chan *chan, 787b5c6aaedSMat Martineau struct sk_buff *skb) 788b5c6aaedSMat Martineau { 789b5c6aaedSMat Martineau if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { 790b5c6aaedSMat Martineau __unpack_extended_control(get_unaligned_le32(skb->data), 791b5c6aaedSMat Martineau &bt_cb(skb)->control); 792cec8ab6eSMat Martineau skb_pull(skb, L2CAP_EXT_CTRL_SIZE); 793b5c6aaedSMat Martineau } else { 794b5c6aaedSMat Martineau __unpack_enhanced_control(get_unaligned_le16(skb->data), 795b5c6aaedSMat Martineau &bt_cb(skb)->control); 796cec8ab6eSMat Martineau skb_pull(skb, L2CAP_ENH_CTRL_SIZE); 797b5c6aaedSMat Martineau } 798b5c6aaedSMat Martineau } 799b5c6aaedSMat Martineau 800b5c6aaedSMat Martineau static u32 __pack_extended_control(struct l2cap_ctrl *control) 801b5c6aaedSMat Martineau { 802b5c6aaedSMat Martineau u32 packed; 803b5c6aaedSMat Martineau 804b5c6aaedSMat Martineau packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT; 805b5c6aaedSMat Martineau packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT; 806b5c6aaedSMat Martineau 807b5c6aaedSMat Martineau if (control->sframe) { 808b5c6aaedSMat Martineau packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT; 809b5c6aaedSMat Martineau packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT; 810b5c6aaedSMat Martineau packed |= L2CAP_EXT_CTRL_FRAME_TYPE; 811b5c6aaedSMat Martineau } else { 812b5c6aaedSMat Martineau packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT; 813b5c6aaedSMat Martineau packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT; 814b5c6aaedSMat Martineau } 815b5c6aaedSMat Martineau 816b5c6aaedSMat Martineau return packed; 817b5c6aaedSMat Martineau } 818b5c6aaedSMat Martineau 819b5c6aaedSMat Martineau static u16 __pack_enhanced_control(struct l2cap_ctrl *control) 820b5c6aaedSMat Martineau { 821b5c6aaedSMat Martineau u16 packed; 822b5c6aaedSMat Martineau 823b5c6aaedSMat Martineau packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT; 824b5c6aaedSMat Martineau packed |= control->final << L2CAP_CTRL_FINAL_SHIFT; 825b5c6aaedSMat Martineau 826b5c6aaedSMat Martineau if (control->sframe) { 827b5c6aaedSMat Martineau packed |= control->poll << L2CAP_CTRL_POLL_SHIFT; 828b5c6aaedSMat Martineau packed |= control->super << L2CAP_CTRL_SUPER_SHIFT; 829b5c6aaedSMat Martineau packed |= L2CAP_CTRL_FRAME_TYPE; 830b5c6aaedSMat Martineau } else { 831b5c6aaedSMat Martineau packed |= control->sar << L2CAP_CTRL_SAR_SHIFT; 832b5c6aaedSMat Martineau packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT; 833b5c6aaedSMat Martineau } 834b5c6aaedSMat Martineau 835b5c6aaedSMat Martineau return packed; 836b5c6aaedSMat Martineau } 837b5c6aaedSMat Martineau 838b5c6aaedSMat Martineau static inline void __pack_control(struct l2cap_chan *chan, 839b5c6aaedSMat Martineau struct l2cap_ctrl *control, 840b5c6aaedSMat Martineau struct sk_buff *skb) 841b5c6aaedSMat Martineau { 842b5c6aaedSMat Martineau if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { 843b5c6aaedSMat Martineau put_unaligned_le32(__pack_extended_control(control), 844b5c6aaedSMat Martineau skb->data + L2CAP_HDR_SIZE); 845b5c6aaedSMat Martineau } else { 846b5c6aaedSMat Martineau put_unaligned_le16(__pack_enhanced_control(control), 847b5c6aaedSMat Martineau skb->data + L2CAP_HDR_SIZE); 848b5c6aaedSMat Martineau } 849b5c6aaedSMat Martineau } 850b5c6aaedSMat Martineau 851ba7aa64fSGustavo Padovan static inline unsigned int __ertm_hdr_size(struct l2cap_chan *chan) 852ba7aa64fSGustavo Padovan { 853ba7aa64fSGustavo Padovan if (test_bit(FLAG_EXT_CTRL, &chan->flags)) 854ba7aa64fSGustavo Padovan return L2CAP_EXT_HDR_SIZE; 855ba7aa64fSGustavo Padovan else 856ba7aa64fSGustavo Padovan return L2CAP_ENH_HDR_SIZE; 857ba7aa64fSGustavo Padovan } 858ba7aa64fSGustavo Padovan 859a67d7f6fSMat Martineau static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan, 860a67d7f6fSMat Martineau u32 control) 8610a708f8fSGustavo F. Padovan { 8620a708f8fSGustavo F. Padovan struct sk_buff *skb; 8630a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 864ba7aa64fSGustavo Padovan int hlen = __ertm_hdr_size(chan); 8650a708f8fSGustavo F. Padovan 8660a708f8fSGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) 86703a51213SAndrei Emeltchenko hlen += L2CAP_FCS_SIZE; 8680a708f8fSGustavo F. Padovan 869a67d7f6fSMat Martineau skb = bt_skb_alloc(hlen, GFP_KERNEL); 8700a708f8fSGustavo F. Padovan 8710a708f8fSGustavo F. Padovan if (!skb) 872a67d7f6fSMat Martineau return ERR_PTR(-ENOMEM); 8730a708f8fSGustavo F. Padovan 8740a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 8750a708f8fSGustavo F. Padovan lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); 876fe4128e0SGustavo F. Padovan lh->cid = cpu_to_le16(chan->dcid); 87788843ab0SAndrei Emeltchenko 878a67d7f6fSMat Martineau if (test_bit(FLAG_EXT_CTRL, &chan->flags)) 879a67d7f6fSMat Martineau put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); 880a67d7f6fSMat Martineau else 881a67d7f6fSMat Martineau put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); 8820a708f8fSGustavo F. Padovan 88347d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) { 884a67d7f6fSMat Martineau u16 fcs = crc16(0, (u8 *)skb->data, skb->len); 88503a51213SAndrei Emeltchenko put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); 8860a708f8fSGustavo F. Padovan } 8870a708f8fSGustavo F. Padovan 88873d80debSLuiz Augusto von Dentz skb->priority = HCI_PRIO_MAX; 889a67d7f6fSMat Martineau return skb; 890a67d7f6fSMat Martineau } 891a67d7f6fSMat Martineau 892a67d7f6fSMat Martineau static void l2cap_send_sframe(struct l2cap_chan *chan, 893a67d7f6fSMat Martineau struct l2cap_ctrl *control) 894a67d7f6fSMat Martineau { 895a67d7f6fSMat Martineau struct sk_buff *skb; 896a67d7f6fSMat Martineau u32 control_field; 897a67d7f6fSMat Martineau 898a67d7f6fSMat Martineau BT_DBG("chan %p, control %p", chan, control); 899a67d7f6fSMat Martineau 900a67d7f6fSMat Martineau if (!control->sframe) 901a67d7f6fSMat Martineau return; 902a67d7f6fSMat Martineau 903a67d7f6fSMat Martineau if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) && 904a67d7f6fSMat Martineau !control->poll) 905a67d7f6fSMat Martineau control->final = 1; 906a67d7f6fSMat Martineau 907a67d7f6fSMat Martineau if (control->super == L2CAP_SUPER_RR) 908a67d7f6fSMat Martineau clear_bit(CONN_RNR_SENT, &chan->conn_state); 909a67d7f6fSMat Martineau else if (control->super == L2CAP_SUPER_RNR) 910a67d7f6fSMat Martineau set_bit(CONN_RNR_SENT, &chan->conn_state); 911a67d7f6fSMat Martineau 912a67d7f6fSMat Martineau if (control->super != L2CAP_SUPER_SREJ) { 913a67d7f6fSMat Martineau chan->last_acked_seq = control->reqseq; 914a67d7f6fSMat Martineau __clear_ack_timer(chan); 915a67d7f6fSMat Martineau } 916a67d7f6fSMat Martineau 917a67d7f6fSMat Martineau BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq, 918a67d7f6fSMat Martineau control->final, control->poll, control->super); 919a67d7f6fSMat Martineau 920a67d7f6fSMat Martineau if (test_bit(FLAG_EXT_CTRL, &chan->flags)) 921a67d7f6fSMat Martineau control_field = __pack_extended_control(control); 922a67d7f6fSMat Martineau else 923a67d7f6fSMat Martineau control_field = __pack_enhanced_control(control); 924a67d7f6fSMat Martineau 925a67d7f6fSMat Martineau skb = l2cap_create_sframe_pdu(chan, control_field); 926a67d7f6fSMat Martineau if (!IS_ERR(skb)) 92773d80debSLuiz Augusto von Dentz l2cap_do_send(chan, skb); 9280a708f8fSGustavo F. Padovan } 9290a708f8fSGustavo F. Padovan 930c9e3d5e0SMat Martineau static void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, bool poll) 9310a708f8fSGustavo F. Padovan { 932c9e3d5e0SMat Martineau struct l2cap_ctrl control; 9330a708f8fSGustavo F. Padovan 934c9e3d5e0SMat Martineau BT_DBG("chan %p, poll %d", chan, poll); 935c9e3d5e0SMat Martineau 936c9e3d5e0SMat Martineau memset(&control, 0, sizeof(control)); 937c9e3d5e0SMat Martineau control.sframe = 1; 938c9e3d5e0SMat Martineau control.poll = poll; 939c9e3d5e0SMat Martineau 940c9e3d5e0SMat Martineau if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) 941c9e3d5e0SMat Martineau control.super = L2CAP_SUPER_RNR; 942c9e3d5e0SMat Martineau else 943c9e3d5e0SMat Martineau control.super = L2CAP_SUPER_RR; 944c9e3d5e0SMat Martineau 945c9e3d5e0SMat Martineau control.reqseq = chan->buffer_seq; 946c9e3d5e0SMat Martineau l2cap_send_sframe(chan, &control); 9470a708f8fSGustavo F. Padovan } 9480a708f8fSGustavo F. Padovan 949b4450035SGustavo F. Padovan static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan) 9500a708f8fSGustavo F. Padovan { 951c1360a1cSGustavo F. Padovan return !test_bit(CONF_CONNECT_PEND, &chan->conf_state); 9520a708f8fSGustavo F. Padovan } 9530a708f8fSGustavo F. Padovan 95493c3e8f5SAndrei Emeltchenko static bool __amp_capable(struct l2cap_chan *chan) 95593c3e8f5SAndrei Emeltchenko { 95693c3e8f5SAndrei Emeltchenko struct l2cap_conn *conn = chan->conn; 95793c3e8f5SAndrei Emeltchenko 95893c3e8f5SAndrei Emeltchenko if (enable_hs && 95993c3e8f5SAndrei Emeltchenko chan->chan_policy == BT_CHANNEL_POLICY_AMP_PREFERRED && 96093c3e8f5SAndrei Emeltchenko conn->fixed_chan_mask & L2CAP_FC_A2MP) 96193c3e8f5SAndrei Emeltchenko return true; 96293c3e8f5SAndrei Emeltchenko else 96393c3e8f5SAndrei Emeltchenko return false; 96493c3e8f5SAndrei Emeltchenko } 96593c3e8f5SAndrei Emeltchenko 9662766be48SAndrei Emeltchenko void l2cap_send_conn_req(struct l2cap_chan *chan) 9679b27f350SAndrei Emeltchenko { 9689b27f350SAndrei Emeltchenko struct l2cap_conn *conn = chan->conn; 9699b27f350SAndrei Emeltchenko struct l2cap_conn_req req; 9709b27f350SAndrei Emeltchenko 9719b27f350SAndrei Emeltchenko req.scid = cpu_to_le16(chan->scid); 9729b27f350SAndrei Emeltchenko req.psm = chan->psm; 9739b27f350SAndrei Emeltchenko 9749b27f350SAndrei Emeltchenko chan->ident = l2cap_get_ident(conn); 9759b27f350SAndrei Emeltchenko 9769b27f350SAndrei Emeltchenko set_bit(CONF_CONNECT_PEND, &chan->conf_state); 9779b27f350SAndrei Emeltchenko 9789b27f350SAndrei Emeltchenko l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req); 9799b27f350SAndrei Emeltchenko } 9809b27f350SAndrei Emeltchenko 9819f0caeb1SVinicius Costa Gomes static void l2cap_chan_ready(struct l2cap_chan *chan) 9829f0caeb1SVinicius Costa Gomes { 9832827011fSMat Martineau /* This clears all conf flags, including CONF_NOT_COMPLETE */ 9849f0caeb1SVinicius Costa Gomes chan->conf_state = 0; 9859f0caeb1SVinicius Costa Gomes __clear_chan_timer(chan); 9869f0caeb1SVinicius Costa Gomes 98754a59aa2SAndrei Emeltchenko chan->state = BT_CONNECTED; 9889f0caeb1SVinicius Costa Gomes 98954a59aa2SAndrei Emeltchenko chan->ops->ready(chan); 9909f0caeb1SVinicius Costa Gomes } 9919f0caeb1SVinicius Costa Gomes 99293c3e8f5SAndrei Emeltchenko static void l2cap_start_connection(struct l2cap_chan *chan) 99393c3e8f5SAndrei Emeltchenko { 99493c3e8f5SAndrei Emeltchenko if (__amp_capable(chan)) { 99593c3e8f5SAndrei Emeltchenko BT_DBG("chan %p AMP capable: discover AMPs", chan); 99693c3e8f5SAndrei Emeltchenko a2mp_discover_amp(chan); 99793c3e8f5SAndrei Emeltchenko } else { 99893c3e8f5SAndrei Emeltchenko l2cap_send_conn_req(chan); 99993c3e8f5SAndrei Emeltchenko } 100093c3e8f5SAndrei Emeltchenko } 100193c3e8f5SAndrei Emeltchenko 1002fc7f8a7eSGustavo F. Padovan static void l2cap_do_start(struct l2cap_chan *chan) 10030a708f8fSGustavo F. Padovan { 10048c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 10050a708f8fSGustavo F. Padovan 10069f0caeb1SVinicius Costa Gomes if (conn->hcon->type == LE_LINK) { 10079f0caeb1SVinicius Costa Gomes l2cap_chan_ready(chan); 10089f0caeb1SVinicius Costa Gomes return; 10099f0caeb1SVinicius Costa Gomes } 10109f0caeb1SVinicius Costa Gomes 10110a708f8fSGustavo F. Padovan if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { 10120a708f8fSGustavo F. Padovan if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) 10130a708f8fSGustavo F. Padovan return; 10140a708f8fSGustavo F. Padovan 1015d45fc423SGustavo F. Padovan if (l2cap_chan_check_security(chan) && 101693c3e8f5SAndrei Emeltchenko __l2cap_no_conn_pending(chan)) { 101793c3e8f5SAndrei Emeltchenko l2cap_start_connection(chan); 101893c3e8f5SAndrei Emeltchenko } 10190a708f8fSGustavo F. Padovan } else { 10200a708f8fSGustavo F. Padovan struct l2cap_info_req req; 1021ac73498cSAndrei Emeltchenko req.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); 10220a708f8fSGustavo F. Padovan 10230a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; 10240a708f8fSGustavo F. Padovan conn->info_ident = l2cap_get_ident(conn); 10250a708f8fSGustavo F. Padovan 1026ba13ccd9SMarcel Holtmann schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); 10270a708f8fSGustavo F. Padovan 10282d792818SGustavo Padovan l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ, 10292d792818SGustavo Padovan sizeof(req), &req); 10300a708f8fSGustavo F. Padovan } 10310a708f8fSGustavo F. Padovan } 10320a708f8fSGustavo F. Padovan 10330a708f8fSGustavo F. Padovan static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) 10340a708f8fSGustavo F. Padovan { 10350a708f8fSGustavo F. Padovan u32 local_feat_mask = l2cap_feat_mask; 10360a708f8fSGustavo F. Padovan if (!disable_ertm) 10370a708f8fSGustavo F. Padovan local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; 10380a708f8fSGustavo F. Padovan 10390a708f8fSGustavo F. Padovan switch (mode) { 10400a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 10410a708f8fSGustavo F. Padovan return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; 10420a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 10430a708f8fSGustavo F. Padovan return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; 10440a708f8fSGustavo F. Padovan default: 10450a708f8fSGustavo F. Padovan return 0x00; 10460a708f8fSGustavo F. Padovan } 10470a708f8fSGustavo F. Padovan } 10480a708f8fSGustavo F. Padovan 10492d792818SGustavo Padovan static void l2cap_send_disconn_req(struct l2cap_conn *conn, 10502d792818SGustavo Padovan struct l2cap_chan *chan, int err) 10510a708f8fSGustavo F. Padovan { 10526be36555SAndrei Emeltchenko struct sock *sk = chan->sk; 10530a708f8fSGustavo F. Padovan struct l2cap_disconn_req req; 10540a708f8fSGustavo F. Padovan 10550a708f8fSGustavo F. Padovan if (!conn) 10560a708f8fSGustavo F. Padovan return; 10570a708f8fSGustavo F. Padovan 10580c1bc5c6SGustavo F. Padovan if (chan->mode == L2CAP_MODE_ERTM) { 10591a09bcb9SGustavo F. Padovan __clear_retrans_timer(chan); 10601a09bcb9SGustavo F. Padovan __clear_monitor_timer(chan); 10611a09bcb9SGustavo F. Padovan __clear_ack_timer(chan); 10620a708f8fSGustavo F. Padovan } 10630a708f8fSGustavo F. Padovan 1064416fa752SAndrei Emeltchenko if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) { 1065416fa752SAndrei Emeltchenko __l2cap_state_change(chan, BT_DISCONN); 1066416fa752SAndrei Emeltchenko return; 1067416fa752SAndrei Emeltchenko } 1068416fa752SAndrei Emeltchenko 1069fe4128e0SGustavo F. Padovan req.dcid = cpu_to_le16(chan->dcid); 1070fe4128e0SGustavo F. Padovan req.scid = cpu_to_le16(chan->scid); 10712d792818SGustavo Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_DISCONN_REQ, 10722d792818SGustavo Padovan sizeof(req), &req); 10730a708f8fSGustavo F. Padovan 10746be36555SAndrei Emeltchenko lock_sock(sk); 10750e587be7SAndrei Emeltchenko __l2cap_state_change(chan, BT_DISCONN); 10762e0052e4SAndrei Emeltchenko __l2cap_chan_set_err(chan, err); 10776be36555SAndrei Emeltchenko release_sock(sk); 10780a708f8fSGustavo F. Padovan } 10790a708f8fSGustavo F. Padovan 10800a708f8fSGustavo F. Padovan /* ---- L2CAP connections ---- */ 10810a708f8fSGustavo F. Padovan static void l2cap_conn_start(struct l2cap_conn *conn) 10820a708f8fSGustavo F. Padovan { 10833df91ea2SAndrei Emeltchenko struct l2cap_chan *chan, *tmp; 10840a708f8fSGustavo F. Padovan 10850a708f8fSGustavo F. Padovan BT_DBG("conn %p", conn); 10860a708f8fSGustavo F. Padovan 10873df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 10880a708f8fSGustavo F. Padovan 10893df91ea2SAndrei Emeltchenko list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { 109048454079SGustavo F. Padovan struct sock *sk = chan->sk; 1091baa7e1faSGustavo F. Padovan 10926be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 10930a708f8fSGustavo F. Padovan 1094715ec005SGustavo F. Padovan if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { 10956be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 10960a708f8fSGustavo F. Padovan continue; 10970a708f8fSGustavo F. Padovan } 10980a708f8fSGustavo F. Padovan 109989bc500eSGustavo F. Padovan if (chan->state == BT_CONNECT) { 1100d45fc423SGustavo F. Padovan if (!l2cap_chan_check_security(chan) || 1101b4450035SGustavo F. Padovan !__l2cap_no_conn_pending(chan)) { 11026be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 11030a708f8fSGustavo F. Padovan continue; 11040a708f8fSGustavo F. Padovan } 11050a708f8fSGustavo F. Padovan 1106c1360a1cSGustavo F. Padovan if (!l2cap_mode_supported(chan->mode, conn->feat_mask) 1107c1360a1cSGustavo F. Padovan && test_bit(CONF_STATE2_DEVICE, 1108c1360a1cSGustavo F. Padovan &chan->conf_state)) { 11090f852724SGustavo F. Padovan l2cap_chan_close(chan, ECONNRESET); 11106be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 11110a708f8fSGustavo F. Padovan continue; 11120a708f8fSGustavo F. Padovan } 11130a708f8fSGustavo F. Padovan 111493c3e8f5SAndrei Emeltchenko l2cap_start_connection(chan); 11150a708f8fSGustavo F. Padovan 111689bc500eSGustavo F. Padovan } else if (chan->state == BT_CONNECT2) { 11170a708f8fSGustavo F. Padovan struct l2cap_conn_rsp rsp; 11180a708f8fSGustavo F. Padovan char buf[128]; 1119fe4128e0SGustavo F. Padovan rsp.scid = cpu_to_le16(chan->dcid); 1120fe4128e0SGustavo F. Padovan rsp.dcid = cpu_to_le16(chan->scid); 11210a708f8fSGustavo F. Padovan 1122d45fc423SGustavo F. Padovan if (l2cap_chan_check_security(chan)) { 11236be36555SAndrei Emeltchenko lock_sock(sk); 1124c5daa683SGustavo Padovan if (test_bit(BT_SK_DEFER_SETUP, 1125c5daa683SGustavo Padovan &bt_sk(sk)->flags)) { 11260a708f8fSGustavo F. Padovan struct sock *parent = bt_sk(sk)->parent; 1127ac73498cSAndrei Emeltchenko rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND); 1128ac73498cSAndrei Emeltchenko rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHOR_PEND); 112905e9a2f6SIlia Kolomisnky if (parent) 11300a708f8fSGustavo F. Padovan parent->sk_data_ready(parent, 0); 11310a708f8fSGustavo F. Padovan 11320a708f8fSGustavo F. Padovan } else { 11330e587be7SAndrei Emeltchenko __l2cap_state_change(chan, BT_CONFIG); 1134ac73498cSAndrei Emeltchenko rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS); 1135ac73498cSAndrei Emeltchenko rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); 11360a708f8fSGustavo F. Padovan } 11376be36555SAndrei Emeltchenko release_sock(sk); 11380a708f8fSGustavo F. Padovan } else { 1139ac73498cSAndrei Emeltchenko rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND); 1140ac73498cSAndrei Emeltchenko rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHEN_PEND); 11410a708f8fSGustavo F. Padovan } 11420a708f8fSGustavo F. Padovan 1143fc7f8a7eSGustavo F. Padovan l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, 1144fc7f8a7eSGustavo F. Padovan sizeof(rsp), &rsp); 11450a708f8fSGustavo F. Padovan 1146c1360a1cSGustavo F. Padovan if (test_bit(CONF_REQ_SENT, &chan->conf_state) || 11470a708f8fSGustavo F. Padovan rsp.result != L2CAP_CR_SUCCESS) { 11486be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 11490a708f8fSGustavo F. Padovan continue; 11500a708f8fSGustavo F. Padovan } 11510a708f8fSGustavo F. Padovan 1152c1360a1cSGustavo F. Padovan set_bit(CONF_REQ_SENT, &chan->conf_state); 11530a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 115473ffa904SGustavo F. Padovan l2cap_build_conf_req(chan, buf), buf); 115573ffa904SGustavo F. Padovan chan->num_conf_req++; 11560a708f8fSGustavo F. Padovan } 11570a708f8fSGustavo F. Padovan 11586be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 11590a708f8fSGustavo F. Padovan } 11600a708f8fSGustavo F. Padovan 11613df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 11620a708f8fSGustavo F. Padovan } 11630a708f8fSGustavo F. Padovan 1164c2287681SIdo Yariv /* Find socket with cid and source/destination bdaddr. 1165b62f328bSVille Tervo * Returns closest match, locked. 1166b62f328bSVille Tervo */ 1167d9b88702SAndrei Emeltchenko static struct l2cap_chan *l2cap_global_chan_by_scid(int state, u16 cid, 1168c2287681SIdo Yariv bdaddr_t *src, 1169c2287681SIdo Yariv bdaddr_t *dst) 1170b62f328bSVille Tervo { 117123691d75SGustavo F. Padovan struct l2cap_chan *c, *c1 = NULL; 1172b62f328bSVille Tervo 117323691d75SGustavo F. Padovan read_lock(&chan_list_lock); 1174b62f328bSVille Tervo 117523691d75SGustavo F. Padovan list_for_each_entry(c, &chan_list, global_l) { 117623691d75SGustavo F. Padovan struct sock *sk = c->sk; 1177fe4128e0SGustavo F. Padovan 117889bc500eSGustavo F. Padovan if (state && c->state != state) 1179b62f328bSVille Tervo continue; 1180b62f328bSVille Tervo 118123691d75SGustavo F. Padovan if (c->scid == cid) { 1182c2287681SIdo Yariv int src_match, dst_match; 1183c2287681SIdo Yariv int src_any, dst_any; 1184c2287681SIdo Yariv 1185b62f328bSVille Tervo /* Exact match. */ 1186c2287681SIdo Yariv src_match = !bacmp(&bt_sk(sk)->src, src); 1187c2287681SIdo Yariv dst_match = !bacmp(&bt_sk(sk)->dst, dst); 1188c2287681SIdo Yariv if (src_match && dst_match) { 118923691d75SGustavo F. Padovan read_unlock(&chan_list_lock); 119023691d75SGustavo F. Padovan return c; 119123691d75SGustavo F. Padovan } 1192b62f328bSVille Tervo 1193b62f328bSVille Tervo /* Closest match */ 1194c2287681SIdo Yariv src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY); 1195c2287681SIdo Yariv dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY); 1196c2287681SIdo Yariv if ((src_match && dst_any) || (src_any && dst_match) || 1197c2287681SIdo Yariv (src_any && dst_any)) 119823691d75SGustavo F. Padovan c1 = c; 1199b62f328bSVille Tervo } 1200b62f328bSVille Tervo } 1201280f294fSGustavo F. Padovan 120223691d75SGustavo F. Padovan read_unlock(&chan_list_lock); 1203b62f328bSVille Tervo 120423691d75SGustavo F. Padovan return c1; 1205b62f328bSVille Tervo } 1206b62f328bSVille Tervo 1207b62f328bSVille Tervo static void l2cap_le_conn_ready(struct l2cap_conn *conn) 1208b62f328bSVille Tervo { 1209c916fbe4SGustavo F. Padovan struct sock *parent, *sk; 121023691d75SGustavo F. Padovan struct l2cap_chan *chan, *pchan; 1211b62f328bSVille Tervo 1212b62f328bSVille Tervo BT_DBG(""); 1213b62f328bSVille Tervo 1214b62f328bSVille Tervo /* Check if we have socket listening on cid */ 121523691d75SGustavo F. Padovan pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA, 1216c2287681SIdo Yariv conn->src, conn->dst); 121723691d75SGustavo F. Padovan if (!pchan) 1218b62f328bSVille Tervo return; 1219b62f328bSVille Tervo 122023691d75SGustavo F. Padovan parent = pchan->sk; 122123691d75SGustavo F. Padovan 1222aa2ac881SGustavo F. Padovan lock_sock(parent); 122362f3a2cfSGustavo F. Padovan 122480b98027SGustavo Padovan chan = pchan->ops->new_connection(pchan); 122580808e43SGustavo F. Padovan if (!chan) 1226b62f328bSVille Tervo goto clean; 1227b62f328bSVille Tervo 122880808e43SGustavo F. Padovan sk = chan->sk; 12295d41ce1dSGustavo F. Padovan 1230b62f328bSVille Tervo hci_conn_hold(conn->hcon); 1231a9ea3ed9SSzymon Janc conn->hcon->disc_timeout = HCI_DISCONN_TIMEOUT; 1232b62f328bSVille Tervo 1233b62f328bSVille Tervo bacpy(&bt_sk(sk)->src, conn->src); 1234b62f328bSVille Tervo bacpy(&bt_sk(sk)->dst, conn->dst); 1235b62f328bSVille Tervo 1236d1010240SGustavo F. Padovan bt_accept_enqueue(parent, sk); 1237d1010240SGustavo F. Padovan 12383d57dc68SGustavo F. Padovan l2cap_chan_add(conn, chan); 123948454079SGustavo F. Padovan 12406754e0dfSGustavo Padovan l2cap_chan_ready(chan); 1241b62f328bSVille Tervo 1242b62f328bSVille Tervo clean: 1243aa2ac881SGustavo F. Padovan release_sock(parent); 1244b62f328bSVille Tervo } 1245b62f328bSVille Tervo 12460a708f8fSGustavo F. Padovan static void l2cap_conn_ready(struct l2cap_conn *conn) 12470a708f8fSGustavo F. Padovan { 124848454079SGustavo F. Padovan struct l2cap_chan *chan; 1249cc110922SVinicius Costa Gomes struct hci_conn *hcon = conn->hcon; 12500a708f8fSGustavo F. Padovan 12510a708f8fSGustavo F. Padovan BT_DBG("conn %p", conn); 12520a708f8fSGustavo F. Padovan 1253cc110922SVinicius Costa Gomes if (!hcon->out && hcon->type == LE_LINK) 1254b62f328bSVille Tervo l2cap_le_conn_ready(conn); 1255b62f328bSVille Tervo 1256cc110922SVinicius Costa Gomes if (hcon->out && hcon->type == LE_LINK) 1257cc110922SVinicius Costa Gomes smp_conn_security(hcon, hcon->pending_sec_level); 1258160dc6acSVinicius Costa Gomes 12593df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 12600a708f8fSGustavo F. Padovan 12613df91ea2SAndrei Emeltchenko list_for_each_entry(chan, &conn->chan_l, list) { 1262baa7e1faSGustavo F. Padovan 12636be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 12640a708f8fSGustavo F. Padovan 1265416fa752SAndrei Emeltchenko if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) { 1266416fa752SAndrei Emeltchenko l2cap_chan_unlock(chan); 1267416fa752SAndrei Emeltchenko continue; 1268416fa752SAndrei Emeltchenko } 1269416fa752SAndrei Emeltchenko 1270cc110922SVinicius Costa Gomes if (hcon->type == LE_LINK) { 1271cc110922SVinicius Costa Gomes if (smp_conn_security(hcon, chan->sec_level)) 1272cf4cd009SAndrei Emeltchenko l2cap_chan_ready(chan); 1273acd7d370SVille Tervo 127463128451SVinicius Costa Gomes } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { 12756be36555SAndrei Emeltchenko struct sock *sk = chan->sk; 1276c9b66675SGustavo F. Padovan __clear_chan_timer(chan); 12776be36555SAndrei Emeltchenko lock_sock(sk); 12780e587be7SAndrei Emeltchenko __l2cap_state_change(chan, BT_CONNECTED); 12790a708f8fSGustavo F. Padovan sk->sk_state_change(sk); 12806be36555SAndrei Emeltchenko release_sock(sk); 1281b501d6a1SAnderson Briglia 128289bc500eSGustavo F. Padovan } else if (chan->state == BT_CONNECT) 1283fc7f8a7eSGustavo F. Padovan l2cap_do_start(chan); 12840a708f8fSGustavo F. Padovan 12856be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 12860a708f8fSGustavo F. Padovan } 12870a708f8fSGustavo F. Padovan 12883df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 12890a708f8fSGustavo F. Padovan } 12900a708f8fSGustavo F. Padovan 12910a708f8fSGustavo F. Padovan /* Notify sockets that we cannot guaranty reliability anymore */ 12920a708f8fSGustavo F. Padovan static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) 12930a708f8fSGustavo F. Padovan { 129448454079SGustavo F. Padovan struct l2cap_chan *chan; 12950a708f8fSGustavo F. Padovan 12960a708f8fSGustavo F. Padovan BT_DBG("conn %p", conn); 12970a708f8fSGustavo F. Padovan 12983df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 12990a708f8fSGustavo F. Padovan 13003df91ea2SAndrei Emeltchenko list_for_each_entry(chan, &conn->chan_l, list) { 1301ecf61bdbSAndrei Emeltchenko if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags)) 1302*1d8b1fd5SGustavo Padovan l2cap_chan_set_err(chan, err); 13030a708f8fSGustavo F. Padovan } 13040a708f8fSGustavo F. Padovan 13053df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 13060a708f8fSGustavo F. Padovan } 13070a708f8fSGustavo F. Padovan 1308f878fcadSGustavo F. Padovan static void l2cap_info_timeout(struct work_struct *work) 13090a708f8fSGustavo F. Padovan { 1310f878fcadSGustavo F. Padovan struct l2cap_conn *conn = container_of(work, struct l2cap_conn, 1311030013d8SGustavo F. Padovan info_timer.work); 13120a708f8fSGustavo F. Padovan 13130a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 13140a708f8fSGustavo F. Padovan conn->info_ident = 0; 13150a708f8fSGustavo F. Padovan 13160a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 13170a708f8fSGustavo F. Padovan } 13180a708f8fSGustavo F. Padovan 13195d3de7dfSVinicius Costa Gomes static void l2cap_conn_del(struct hci_conn *hcon, int err) 13205d3de7dfSVinicius Costa Gomes { 13215d3de7dfSVinicius Costa Gomes struct l2cap_conn *conn = hcon->l2cap_data; 13225d3de7dfSVinicius Costa Gomes struct l2cap_chan *chan, *l; 13235d3de7dfSVinicius Costa Gomes 13245d3de7dfSVinicius Costa Gomes if (!conn) 13255d3de7dfSVinicius Costa Gomes return; 13265d3de7dfSVinicius Costa Gomes 13275d3de7dfSVinicius Costa Gomes BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); 13285d3de7dfSVinicius Costa Gomes 13295d3de7dfSVinicius Costa Gomes kfree_skb(conn->rx_skb); 13305d3de7dfSVinicius Costa Gomes 13313df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 13323df91ea2SAndrei Emeltchenko 13335d3de7dfSVinicius Costa Gomes /* Kill channels */ 13345d3de7dfSVinicius Costa Gomes list_for_each_entry_safe(chan, l, &conn->chan_l, list) { 133561d6ef3eSMat Martineau l2cap_chan_hold(chan); 13366be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 13376be36555SAndrei Emeltchenko 13385d3de7dfSVinicius Costa Gomes l2cap_chan_del(chan, err); 13396be36555SAndrei Emeltchenko 13406be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 13416be36555SAndrei Emeltchenko 134280b98027SGustavo Padovan chan->ops->close(chan); 134361d6ef3eSMat Martineau l2cap_chan_put(chan); 13445d3de7dfSVinicius Costa Gomes } 13455d3de7dfSVinicius Costa Gomes 13463df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 13473df91ea2SAndrei Emeltchenko 134873d80debSLuiz Augusto von Dentz hci_chan_del(conn->hchan); 134973d80debSLuiz Augusto von Dentz 13505d3de7dfSVinicius Costa Gomes if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) 1351127074bfSUlisses Furquim cancel_delayed_work_sync(&conn->info_timer); 13525d3de7dfSVinicius Costa Gomes 135351a8efd7SJohan Hedberg if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) { 1354127074bfSUlisses Furquim cancel_delayed_work_sync(&conn->security_timer); 13558aab4757SVinicius Costa Gomes smp_chan_destroy(conn); 1356d26a2345SVinicius Costa Gomes } 13575d3de7dfSVinicius Costa Gomes 13585d3de7dfSVinicius Costa Gomes hcon->l2cap_data = NULL; 13595d3de7dfSVinicius Costa Gomes kfree(conn); 13605d3de7dfSVinicius Costa Gomes } 13615d3de7dfSVinicius Costa Gomes 13626c9d42a1SGustavo F. Padovan static void security_timeout(struct work_struct *work) 13635d3de7dfSVinicius Costa Gomes { 13646c9d42a1SGustavo F. Padovan struct l2cap_conn *conn = container_of(work, struct l2cap_conn, 13656c9d42a1SGustavo F. Padovan security_timer.work); 13665d3de7dfSVinicius Costa Gomes 1367d06cc416SJohan Hedberg BT_DBG("conn %p", conn); 1368d06cc416SJohan Hedberg 1369d06cc416SJohan Hedberg if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags)) { 1370d06cc416SJohan Hedberg smp_chan_destroy(conn); 13715d3de7dfSVinicius Costa Gomes l2cap_conn_del(conn->hcon, ETIMEDOUT); 13725d3de7dfSVinicius Costa Gomes } 1373d06cc416SJohan Hedberg } 13745d3de7dfSVinicius Costa Gomes 13750a708f8fSGustavo F. Padovan static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) 13760a708f8fSGustavo F. Padovan { 13770a708f8fSGustavo F. Padovan struct l2cap_conn *conn = hcon->l2cap_data; 137873d80debSLuiz Augusto von Dentz struct hci_chan *hchan; 13790a708f8fSGustavo F. Padovan 13800a708f8fSGustavo F. Padovan if (conn || status) 13810a708f8fSGustavo F. Padovan return conn; 13820a708f8fSGustavo F. Padovan 138373d80debSLuiz Augusto von Dentz hchan = hci_chan_create(hcon); 138473d80debSLuiz Augusto von Dentz if (!hchan) 13850a708f8fSGustavo F. Padovan return NULL; 13860a708f8fSGustavo F. Padovan 13878bcde1f2SGustavo Padovan conn = kzalloc(sizeof(struct l2cap_conn), GFP_KERNEL); 138873d80debSLuiz Augusto von Dentz if (!conn) { 138973d80debSLuiz Augusto von Dentz hci_chan_del(hchan); 139073d80debSLuiz Augusto von Dentz return NULL; 139173d80debSLuiz Augusto von Dentz } 139273d80debSLuiz Augusto von Dentz 13930a708f8fSGustavo F. Padovan hcon->l2cap_data = conn; 13940a708f8fSGustavo F. Padovan conn->hcon = hcon; 139573d80debSLuiz Augusto von Dentz conn->hchan = hchan; 13960a708f8fSGustavo F. Padovan 139773d80debSLuiz Augusto von Dentz BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan); 13980a708f8fSGustavo F. Padovan 1399dcc042d5SAndrei Emeltchenko switch (hcon->type) { 1400dcc042d5SAndrei Emeltchenko case AMP_LINK: 1401dcc042d5SAndrei Emeltchenko conn->mtu = hcon->hdev->block_mtu; 1402dcc042d5SAndrei Emeltchenko break; 1403dcc042d5SAndrei Emeltchenko 1404dcc042d5SAndrei Emeltchenko case LE_LINK: 1405dcc042d5SAndrei Emeltchenko if (hcon->hdev->le_mtu) { 1406acd7d370SVille Tervo conn->mtu = hcon->hdev->le_mtu; 1407dcc042d5SAndrei Emeltchenko break; 1408dcc042d5SAndrei Emeltchenko } 1409dcc042d5SAndrei Emeltchenko /* fall through */ 1410dcc042d5SAndrei Emeltchenko 1411dcc042d5SAndrei Emeltchenko default: 14120a708f8fSGustavo F. Padovan conn->mtu = hcon->hdev->acl_mtu; 1413dcc042d5SAndrei Emeltchenko break; 1414dcc042d5SAndrei Emeltchenko } 1415acd7d370SVille Tervo 14160a708f8fSGustavo F. Padovan conn->src = &hcon->hdev->bdaddr; 14170a708f8fSGustavo F. Padovan conn->dst = &hcon->dst; 14180a708f8fSGustavo F. Padovan 14190a708f8fSGustavo F. Padovan conn->feat_mask = 0; 14200a708f8fSGustavo F. Padovan 14210a708f8fSGustavo F. Padovan spin_lock_init(&conn->lock); 14223df91ea2SAndrei Emeltchenko mutex_init(&conn->chan_lock); 1423baa7e1faSGustavo F. Padovan 1424baa7e1faSGustavo F. Padovan INIT_LIST_HEAD(&conn->chan_l); 14250a708f8fSGustavo F. Padovan 14265d3de7dfSVinicius Costa Gomes if (hcon->type == LE_LINK) 14276c9d42a1SGustavo F. Padovan INIT_DELAYED_WORK(&conn->security_timer, security_timeout); 14285d3de7dfSVinicius Costa Gomes else 1429030013d8SGustavo F. Padovan INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout); 14300a708f8fSGustavo F. Padovan 14319f5a0d7bSAndrei Emeltchenko conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; 14320a708f8fSGustavo F. Padovan 14330a708f8fSGustavo F. Padovan return conn; 14340a708f8fSGustavo F. Padovan } 14350a708f8fSGustavo F. Padovan 14360a708f8fSGustavo F. Padovan /* ---- Socket interface ---- */ 14370a708f8fSGustavo F. Padovan 1438c2287681SIdo Yariv /* Find socket with psm and source / destination bdaddr. 14390a708f8fSGustavo F. Padovan * Returns closest match. 14400a708f8fSGustavo F. Padovan */ 1441c2287681SIdo Yariv static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, 1442c2287681SIdo Yariv bdaddr_t *src, 1443c2287681SIdo Yariv bdaddr_t *dst) 14440a708f8fSGustavo F. Padovan { 144523691d75SGustavo F. Padovan struct l2cap_chan *c, *c1 = NULL; 14460a708f8fSGustavo F. Padovan 144723691d75SGustavo F. Padovan read_lock(&chan_list_lock); 14480a708f8fSGustavo F. Padovan 144923691d75SGustavo F. Padovan list_for_each_entry(c, &chan_list, global_l) { 145023691d75SGustavo F. Padovan struct sock *sk = c->sk; 1451fe4128e0SGustavo F. Padovan 145289bc500eSGustavo F. Padovan if (state && c->state != state) 14530a708f8fSGustavo F. Padovan continue; 14540a708f8fSGustavo F. Padovan 145523691d75SGustavo F. Padovan if (c->psm == psm) { 1456c2287681SIdo Yariv int src_match, dst_match; 1457c2287681SIdo Yariv int src_any, dst_any; 1458c2287681SIdo Yariv 14590a708f8fSGustavo F. Padovan /* Exact match. */ 1460c2287681SIdo Yariv src_match = !bacmp(&bt_sk(sk)->src, src); 1461c2287681SIdo Yariv dst_match = !bacmp(&bt_sk(sk)->dst, dst); 1462c2287681SIdo Yariv if (src_match && dst_match) { 1463a7567b20SJohannes Berg read_unlock(&chan_list_lock); 146423691d75SGustavo F. Padovan return c; 146523691d75SGustavo F. Padovan } 14660a708f8fSGustavo F. Padovan 14670a708f8fSGustavo F. Padovan /* Closest match */ 1468c2287681SIdo Yariv src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY); 1469c2287681SIdo Yariv dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY); 1470c2287681SIdo Yariv if ((src_match && dst_any) || (src_any && dst_match) || 1471c2287681SIdo Yariv (src_any && dst_any)) 147223691d75SGustavo F. Padovan c1 = c; 14730a708f8fSGustavo F. Padovan } 14740a708f8fSGustavo F. Padovan } 14750a708f8fSGustavo F. Padovan 147623691d75SGustavo F. Padovan read_unlock(&chan_list_lock); 14770a708f8fSGustavo F. Padovan 147823691d75SGustavo F. Padovan return c1; 14790a708f8fSGustavo F. Padovan } 14800a708f8fSGustavo F. Padovan 14818e9f9892SAndre Guedes int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid, 14828e9f9892SAndre Guedes bdaddr_t *dst, u8 dst_type) 14830a708f8fSGustavo F. Padovan { 14845d41ce1dSGustavo F. Padovan struct sock *sk = chan->sk; 14850a708f8fSGustavo F. Padovan bdaddr_t *src = &bt_sk(sk)->src; 14860a708f8fSGustavo F. Padovan struct l2cap_conn *conn; 14870a708f8fSGustavo F. Padovan struct hci_conn *hcon; 14880a708f8fSGustavo F. Padovan struct hci_dev *hdev; 14890a708f8fSGustavo F. Padovan __u8 auth_type; 14900a708f8fSGustavo F. Padovan int err; 14910a708f8fSGustavo F. Padovan 14926ed93dc6SAndrei Emeltchenko BT_DBG("%pMR -> %pMR (type %u) psm 0x%2.2x", src, dst, 1493ab19516aSSyam Sidhardhan dst_type, __le16_to_cpu(psm)); 14940a708f8fSGustavo F. Padovan 14950a708f8fSGustavo F. Padovan hdev = hci_get_route(dst, src); 14960a708f8fSGustavo F. Padovan if (!hdev) 14970a708f8fSGustavo F. Padovan return -EHOSTUNREACH; 14980a708f8fSGustavo F. Padovan 149909fd0de5SGustavo F. Padovan hci_dev_lock(hdev); 15000a708f8fSGustavo F. Padovan 15016be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 150203a00194SGustavo F. Padovan 150303a00194SGustavo F. Padovan /* PSM must be odd and lsb of upper byte must be 0 */ 150403a00194SGustavo F. Padovan if ((__le16_to_cpu(psm) & 0x0101) != 0x0001 && !cid && 150503a00194SGustavo F. Padovan chan->chan_type != L2CAP_CHAN_RAW) { 150603a00194SGustavo F. Padovan err = -EINVAL; 150703a00194SGustavo F. Padovan goto done; 150803a00194SGustavo F. Padovan } 150903a00194SGustavo F. Padovan 151003a00194SGustavo F. Padovan if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !(psm || cid)) { 151103a00194SGustavo F. Padovan err = -EINVAL; 151203a00194SGustavo F. Padovan goto done; 151303a00194SGustavo F. Padovan } 151403a00194SGustavo F. Padovan 151503a00194SGustavo F. Padovan switch (chan->mode) { 151603a00194SGustavo F. Padovan case L2CAP_MODE_BASIC: 151703a00194SGustavo F. Padovan break; 151803a00194SGustavo F. Padovan case L2CAP_MODE_ERTM: 151903a00194SGustavo F. Padovan case L2CAP_MODE_STREAMING: 152003a00194SGustavo F. Padovan if (!disable_ertm) 152103a00194SGustavo F. Padovan break; 152203a00194SGustavo F. Padovan /* fall through */ 152303a00194SGustavo F. Padovan default: 152403a00194SGustavo F. Padovan err = -ENOTSUPP; 152503a00194SGustavo F. Padovan goto done; 152603a00194SGustavo F. Padovan } 152703a00194SGustavo F. Padovan 15280797e01dSGustavo Padovan switch (chan->state) { 152903a00194SGustavo F. Padovan case BT_CONNECT: 153003a00194SGustavo F. Padovan case BT_CONNECT2: 153103a00194SGustavo F. Padovan case BT_CONFIG: 153203a00194SGustavo F. Padovan /* Already connecting */ 153303a00194SGustavo F. Padovan err = 0; 153403a00194SGustavo F. Padovan goto done; 153503a00194SGustavo F. Padovan 153603a00194SGustavo F. Padovan case BT_CONNECTED: 153703a00194SGustavo F. Padovan /* Already connected */ 153803a00194SGustavo F. Padovan err = -EISCONN; 153903a00194SGustavo F. Padovan goto done; 154003a00194SGustavo F. Padovan 154103a00194SGustavo F. Padovan case BT_OPEN: 154203a00194SGustavo F. Padovan case BT_BOUND: 154303a00194SGustavo F. Padovan /* Can connect */ 154403a00194SGustavo F. Padovan break; 154503a00194SGustavo F. Padovan 154603a00194SGustavo F. Padovan default: 154703a00194SGustavo F. Padovan err = -EBADFD; 154803a00194SGustavo F. Padovan goto done; 154903a00194SGustavo F. Padovan } 155003a00194SGustavo F. Padovan 155103a00194SGustavo F. Padovan /* Set destination address and psm */ 15520797e01dSGustavo Padovan lock_sock(sk); 15539219b2a0SGustavo F. Padovan bacpy(&bt_sk(sk)->dst, dst); 15546be36555SAndrei Emeltchenko release_sock(sk); 15556be36555SAndrei Emeltchenko 155603a00194SGustavo F. Padovan chan->psm = psm; 155703a00194SGustavo F. Padovan chan->dcid = cid; 15580a708f8fSGustavo F. Padovan 15594343478fSGustavo F. Padovan auth_type = l2cap_get_auth_type(chan); 15600a708f8fSGustavo F. Padovan 1561fe4128e0SGustavo F. Padovan if (chan->dcid == L2CAP_CID_LE_DATA) 15628e9f9892SAndre Guedes hcon = hci_connect(hdev, LE_LINK, dst, dst_type, 15634343478fSGustavo F. Padovan chan->sec_level, auth_type); 1564acd7d370SVille Tervo else 15658e9f9892SAndre Guedes hcon = hci_connect(hdev, ACL_LINK, dst, dst_type, 15664343478fSGustavo F. Padovan chan->sec_level, auth_type); 1567acd7d370SVille Tervo 156830e76272SVille Tervo if (IS_ERR(hcon)) { 156930e76272SVille Tervo err = PTR_ERR(hcon); 15700a708f8fSGustavo F. Padovan goto done; 157130e76272SVille Tervo } 15720a708f8fSGustavo F. Padovan 15730a708f8fSGustavo F. Padovan conn = l2cap_conn_add(hcon, 0); 15740a708f8fSGustavo F. Padovan if (!conn) { 15750a708f8fSGustavo F. Padovan hci_conn_put(hcon); 157630e76272SVille Tervo err = -ENOMEM; 15770a708f8fSGustavo F. Padovan goto done; 15780a708f8fSGustavo F. Padovan } 15790a708f8fSGustavo F. Padovan 15809f0caeb1SVinicius Costa Gomes if (hcon->type == LE_LINK) { 15819f0caeb1SVinicius Costa Gomes err = 0; 15829f0caeb1SVinicius Costa Gomes 15839f0caeb1SVinicius Costa Gomes if (!list_empty(&conn->chan_l)) { 15849f0caeb1SVinicius Costa Gomes err = -EBUSY; 15859f0caeb1SVinicius Costa Gomes hci_conn_put(hcon); 15869f0caeb1SVinicius Costa Gomes } 15879f0caeb1SVinicius Costa Gomes 15889f0caeb1SVinicius Costa Gomes if (err) 15899f0caeb1SVinicius Costa Gomes goto done; 15909f0caeb1SVinicius Costa Gomes } 15919f0caeb1SVinicius Costa Gomes 15920a708f8fSGustavo F. Padovan /* Update source addr of the socket */ 15930a708f8fSGustavo F. Padovan bacpy(src, conn->src); 15940a708f8fSGustavo F. Padovan 15956be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 159648454079SGustavo F. Padovan l2cap_chan_add(conn, chan); 15976be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 159848454079SGustavo F. Padovan 15996be36555SAndrei Emeltchenko l2cap_state_change(chan, BT_CONNECT); 1600c9b66675SGustavo F. Padovan __set_chan_timer(chan, sk->sk_sndtimeo); 16010a708f8fSGustavo F. Padovan 16020a708f8fSGustavo F. Padovan if (hcon->state == BT_CONNECTED) { 1603715ec005SGustavo F. Padovan if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { 1604c9b66675SGustavo F. Padovan __clear_chan_timer(chan); 1605d45fc423SGustavo F. Padovan if (l2cap_chan_check_security(chan)) 16066be36555SAndrei Emeltchenko l2cap_state_change(chan, BT_CONNECTED); 16070a708f8fSGustavo F. Padovan } else 1608fc7f8a7eSGustavo F. Padovan l2cap_do_start(chan); 16090a708f8fSGustavo F. Padovan } 16100a708f8fSGustavo F. Padovan 161130e76272SVille Tervo err = 0; 161230e76272SVille Tervo 16130a708f8fSGustavo F. Padovan done: 16146be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 161509fd0de5SGustavo F. Padovan hci_dev_unlock(hdev); 16160a708f8fSGustavo F. Padovan hci_dev_put(hdev); 16170a708f8fSGustavo F. Padovan return err; 16180a708f8fSGustavo F. Padovan } 16190a708f8fSGustavo F. Padovan 1620dcba0dbaSGustavo F. Padovan int __l2cap_wait_ack(struct sock *sk) 16210a708f8fSGustavo F. Padovan { 16228c1d787bSGustavo F. Padovan struct l2cap_chan *chan = l2cap_pi(sk)->chan; 16230a708f8fSGustavo F. Padovan DECLARE_WAITQUEUE(wait, current); 16240a708f8fSGustavo F. Padovan int err = 0; 16250a708f8fSGustavo F. Padovan int timeo = HZ/5; 16260a708f8fSGustavo F. Padovan 16270a708f8fSGustavo F. Padovan add_wait_queue(sk_sleep(sk), &wait); 16280a708f8fSGustavo F. Padovan set_current_state(TASK_INTERRUPTIBLE); 1629a71a0cf4SPeter Hurley while (chan->unacked_frames > 0 && chan->conn) { 16300a708f8fSGustavo F. Padovan if (!timeo) 16310a708f8fSGustavo F. Padovan timeo = HZ/5; 16320a708f8fSGustavo F. Padovan 16330a708f8fSGustavo F. Padovan if (signal_pending(current)) { 16340a708f8fSGustavo F. Padovan err = sock_intr_errno(timeo); 16350a708f8fSGustavo F. Padovan break; 16360a708f8fSGustavo F. Padovan } 16370a708f8fSGustavo F. Padovan 16380a708f8fSGustavo F. Padovan release_sock(sk); 16390a708f8fSGustavo F. Padovan timeo = schedule_timeout(timeo); 16400a708f8fSGustavo F. Padovan lock_sock(sk); 1641a71a0cf4SPeter Hurley set_current_state(TASK_INTERRUPTIBLE); 16420a708f8fSGustavo F. Padovan 16430a708f8fSGustavo F. Padovan err = sock_error(sk); 16440a708f8fSGustavo F. Padovan if (err) 16450a708f8fSGustavo F. Padovan break; 16460a708f8fSGustavo F. Padovan } 16470a708f8fSGustavo F. Padovan set_current_state(TASK_RUNNING); 16480a708f8fSGustavo F. Padovan remove_wait_queue(sk_sleep(sk), &wait); 16490a708f8fSGustavo F. Padovan return err; 16500a708f8fSGustavo F. Padovan } 16510a708f8fSGustavo F. Padovan 1652721c4181SGustavo F. Padovan static void l2cap_monitor_timeout(struct work_struct *work) 16530a708f8fSGustavo F. Padovan { 1654721c4181SGustavo F. Padovan struct l2cap_chan *chan = container_of(work, struct l2cap_chan, 1655721c4181SGustavo F. Padovan monitor_timer.work); 16560a708f8fSGustavo F. Padovan 1657525cd185SGustavo F. Padovan BT_DBG("chan %p", chan); 16580a708f8fSGustavo F. Padovan 16596be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 16606be36555SAndrei Emeltchenko 166180909e04SMat Martineau if (!chan->conn) { 16626be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 16638d7e1c7fSAndrei Emeltchenko l2cap_chan_put(chan); 16640a708f8fSGustavo F. Padovan return; 16650a708f8fSGustavo F. Padovan } 16660a708f8fSGustavo F. Padovan 1667401bb1f7SAndrei Emeltchenko l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO); 16680a708f8fSGustavo F. Padovan 16696be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 16708d7e1c7fSAndrei Emeltchenko l2cap_chan_put(chan); 16710a708f8fSGustavo F. Padovan } 16720a708f8fSGustavo F. Padovan 1673721c4181SGustavo F. Padovan static void l2cap_retrans_timeout(struct work_struct *work) 16740a708f8fSGustavo F. Padovan { 1675721c4181SGustavo F. Padovan struct l2cap_chan *chan = container_of(work, struct l2cap_chan, 1676721c4181SGustavo F. Padovan retrans_timer.work); 16770a708f8fSGustavo F. Padovan 167849208c9cSGustavo F. Padovan BT_DBG("chan %p", chan); 16790a708f8fSGustavo F. Padovan 16806be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 16816be36555SAndrei Emeltchenko 168280909e04SMat Martineau if (!chan->conn) { 168380909e04SMat Martineau l2cap_chan_unlock(chan); 168480909e04SMat Martineau l2cap_chan_put(chan); 168580909e04SMat Martineau return; 168680909e04SMat Martineau } 16870a708f8fSGustavo F. Padovan 1688401bb1f7SAndrei Emeltchenko l2cap_tx(chan, NULL, NULL, L2CAP_EV_RETRANS_TO); 16896be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 16908d7e1c7fSAndrei Emeltchenko l2cap_chan_put(chan); 16910a708f8fSGustavo F. Padovan } 16920a708f8fSGustavo F. Padovan 1693d660366dSGustavo Padovan static void l2cap_streaming_send(struct l2cap_chan *chan, 16943733937dSMat Martineau struct sk_buff_head *skbs) 16950a708f8fSGustavo F. Padovan { 16960a708f8fSGustavo F. Padovan struct sk_buff *skb; 16973733937dSMat Martineau struct l2cap_ctrl *control; 16980a708f8fSGustavo F. Padovan 16993733937dSMat Martineau BT_DBG("chan %p, skbs %p", chan, skbs); 17003733937dSMat Martineau 17013733937dSMat Martineau skb_queue_splice_tail_init(skbs, &chan->tx_q); 17023733937dSMat Martineau 17033733937dSMat Martineau while (!skb_queue_empty(&chan->tx_q)) { 17043733937dSMat Martineau 17053733937dSMat Martineau skb = skb_dequeue(&chan->tx_q); 17063733937dSMat Martineau 17073733937dSMat Martineau bt_cb(skb)->control.retries = 1; 17083733937dSMat Martineau control = &bt_cb(skb)->control; 17093733937dSMat Martineau 17103733937dSMat Martineau control->reqseq = 0; 17113733937dSMat Martineau control->txseq = chan->next_tx_seq; 17123733937dSMat Martineau 17133733937dSMat Martineau __pack_control(chan, control, skb); 17140a708f8fSGustavo F. Padovan 171547d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) { 17163733937dSMat Martineau u16 fcs = crc16(0, (u8 *) skb->data, skb->len); 17173733937dSMat Martineau put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); 17180a708f8fSGustavo F. Padovan } 17190a708f8fSGustavo F. Padovan 17204343478fSGustavo F. Padovan l2cap_do_send(chan, skb); 17210a708f8fSGustavo F. Padovan 1722b4400672SAndrei Emeltchenko BT_DBG("Sent txseq %u", control->txseq); 17233733937dSMat Martineau 1724836be934SAndrei Emeltchenko chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); 17253733937dSMat Martineau chan->frames_sent++; 17260a708f8fSGustavo F. Padovan } 17270a708f8fSGustavo F. Padovan } 17280a708f8fSGustavo F. Padovan 172967c9e840SSzymon Janc static int l2cap_ertm_send(struct l2cap_chan *chan) 17300a708f8fSGustavo F. Padovan { 17310a708f8fSGustavo F. Padovan struct sk_buff *skb, *tx_skb; 173218a48e76SMat Martineau struct l2cap_ctrl *control; 173318a48e76SMat Martineau int sent = 0; 173418a48e76SMat Martineau 173518a48e76SMat Martineau BT_DBG("chan %p", chan); 17360a708f8fSGustavo F. Padovan 173789bc500eSGustavo F. Padovan if (chan->state != BT_CONNECTED) 17380a708f8fSGustavo F. Padovan return -ENOTCONN; 17390a708f8fSGustavo F. Padovan 174094122bbeSMat Martineau if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) 174194122bbeSMat Martineau return 0; 174294122bbeSMat Martineau 174318a48e76SMat Martineau while (chan->tx_send_head && 174418a48e76SMat Martineau chan->unacked_frames < chan->remote_tx_win && 174518a48e76SMat Martineau chan->tx_state == L2CAP_TX_STATE_XMIT) { 17460a708f8fSGustavo F. Padovan 174718a48e76SMat Martineau skb = chan->tx_send_head; 17480a708f8fSGustavo F. Padovan 174918a48e76SMat Martineau bt_cb(skb)->control.retries = 1; 175018a48e76SMat Martineau control = &bt_cb(skb)->control; 17510a708f8fSGustavo F. Padovan 1752e2ab4353SGustavo F. Padovan if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) 175318a48e76SMat Martineau control->final = 1; 1754e2ab4353SGustavo F. Padovan 175518a48e76SMat Martineau control->reqseq = chan->buffer_seq; 175618a48e76SMat Martineau chan->last_acked_seq = chan->buffer_seq; 175718a48e76SMat Martineau control->txseq = chan->next_tx_seq; 17580a708f8fSGustavo F. Padovan 175918a48e76SMat Martineau __pack_control(chan, control, skb); 17600a708f8fSGustavo F. Padovan 176147d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) { 176218a48e76SMat Martineau u16 fcs = crc16(0, (u8 *) skb->data, skb->len); 176318a48e76SMat Martineau put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); 17640a708f8fSGustavo F. Padovan } 17650a708f8fSGustavo F. Padovan 176618a48e76SMat Martineau /* Clone after data has been modified. Data is assumed to be 176718a48e76SMat Martineau read-only (for locking purposes) on cloned sk_buffs. 176818a48e76SMat Martineau */ 176918a48e76SMat Martineau tx_skb = skb_clone(skb, GFP_KERNEL); 177018a48e76SMat Martineau 177118a48e76SMat Martineau if (!tx_skb) 177218a48e76SMat Martineau break; 17730a708f8fSGustavo F. Padovan 17741a09bcb9SGustavo F. Padovan __set_retrans_timer(chan); 17750a708f8fSGustavo F. Padovan 1776836be934SAndrei Emeltchenko chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); 17776a026610SGustavo F. Padovan chan->unacked_frames++; 17786a026610SGustavo F. Padovan chan->frames_sent++; 177918a48e76SMat Martineau sent++; 17800a708f8fSGustavo F. Padovan 178158d35f87SGustavo F. Padovan if (skb_queue_is_last(&chan->tx_q, skb)) 178258d35f87SGustavo F. Padovan chan->tx_send_head = NULL; 17830a708f8fSGustavo F. Padovan else 178458d35f87SGustavo F. Padovan chan->tx_send_head = skb_queue_next(&chan->tx_q, skb); 178518a48e76SMat Martineau 178618a48e76SMat Martineau l2cap_do_send(chan, tx_skb); 1787b4400672SAndrei Emeltchenko BT_DBG("Sent txseq %u", control->txseq); 17880a708f8fSGustavo F. Padovan } 17890a708f8fSGustavo F. Padovan 1790b4400672SAndrei Emeltchenko BT_DBG("Sent %d, %u unacked, %u in ERTM queue", sent, 1791b4400672SAndrei Emeltchenko chan->unacked_frames, skb_queue_len(&chan->tx_q)); 179218a48e76SMat Martineau 179318a48e76SMat Martineau return sent; 17940a708f8fSGustavo F. Padovan } 17950a708f8fSGustavo F. Padovan 1796e1fbd4c1SMat Martineau static void l2cap_ertm_resend(struct l2cap_chan *chan) 1797e1fbd4c1SMat Martineau { 1798e1fbd4c1SMat Martineau struct l2cap_ctrl control; 1799e1fbd4c1SMat Martineau struct sk_buff *skb; 1800e1fbd4c1SMat Martineau struct sk_buff *tx_skb; 1801e1fbd4c1SMat Martineau u16 seq; 1802e1fbd4c1SMat Martineau 1803e1fbd4c1SMat Martineau BT_DBG("chan %p", chan); 1804e1fbd4c1SMat Martineau 1805e1fbd4c1SMat Martineau if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) 1806e1fbd4c1SMat Martineau return; 1807e1fbd4c1SMat Martineau 1808e1fbd4c1SMat Martineau while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) { 1809e1fbd4c1SMat Martineau seq = l2cap_seq_list_pop(&chan->retrans_list); 1810e1fbd4c1SMat Martineau 1811e1fbd4c1SMat Martineau skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq); 1812e1fbd4c1SMat Martineau if (!skb) { 1813e1fbd4c1SMat Martineau BT_DBG("Error: Can't retransmit seq %d, frame missing", 1814e1fbd4c1SMat Martineau seq); 1815e1fbd4c1SMat Martineau continue; 1816e1fbd4c1SMat Martineau } 1817e1fbd4c1SMat Martineau 1818e1fbd4c1SMat Martineau bt_cb(skb)->control.retries++; 1819e1fbd4c1SMat Martineau control = bt_cb(skb)->control; 1820e1fbd4c1SMat Martineau 1821e1fbd4c1SMat Martineau if (chan->max_tx != 0 && 1822e1fbd4c1SMat Martineau bt_cb(skb)->control.retries > chan->max_tx) { 1823e1fbd4c1SMat Martineau BT_DBG("Retry limit exceeded (%d)", chan->max_tx); 1824e1fbd4c1SMat Martineau l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); 1825e1fbd4c1SMat Martineau l2cap_seq_list_clear(&chan->retrans_list); 1826e1fbd4c1SMat Martineau break; 1827e1fbd4c1SMat Martineau } 1828e1fbd4c1SMat Martineau 1829e1fbd4c1SMat Martineau control.reqseq = chan->buffer_seq; 1830e1fbd4c1SMat Martineau if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) 1831e1fbd4c1SMat Martineau control.final = 1; 1832e1fbd4c1SMat Martineau else 1833e1fbd4c1SMat Martineau control.final = 0; 1834e1fbd4c1SMat Martineau 1835e1fbd4c1SMat Martineau if (skb_cloned(skb)) { 1836e1fbd4c1SMat Martineau /* Cloned sk_buffs are read-only, so we need a 1837e1fbd4c1SMat Martineau * writeable copy 1838e1fbd4c1SMat Martineau */ 18398bcde1f2SGustavo Padovan tx_skb = skb_copy(skb, GFP_KERNEL); 1840e1fbd4c1SMat Martineau } else { 18418bcde1f2SGustavo Padovan tx_skb = skb_clone(skb, GFP_KERNEL); 1842e1fbd4c1SMat Martineau } 1843e1fbd4c1SMat Martineau 1844e1fbd4c1SMat Martineau if (!tx_skb) { 1845e1fbd4c1SMat Martineau l2cap_seq_list_clear(&chan->retrans_list); 1846e1fbd4c1SMat Martineau break; 1847e1fbd4c1SMat Martineau } 1848e1fbd4c1SMat Martineau 1849e1fbd4c1SMat Martineau /* Update skb contents */ 1850e1fbd4c1SMat Martineau if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { 1851e1fbd4c1SMat Martineau put_unaligned_le32(__pack_extended_control(&control), 1852e1fbd4c1SMat Martineau tx_skb->data + L2CAP_HDR_SIZE); 1853e1fbd4c1SMat Martineau } else { 1854e1fbd4c1SMat Martineau put_unaligned_le16(__pack_enhanced_control(&control), 1855e1fbd4c1SMat Martineau tx_skb->data + L2CAP_HDR_SIZE); 1856e1fbd4c1SMat Martineau } 1857e1fbd4c1SMat Martineau 1858e1fbd4c1SMat Martineau if (chan->fcs == L2CAP_FCS_CRC16) { 1859e1fbd4c1SMat Martineau u16 fcs = crc16(0, (u8 *) tx_skb->data, tx_skb->len); 1860e1fbd4c1SMat Martineau put_unaligned_le16(fcs, skb_put(tx_skb, 1861e1fbd4c1SMat Martineau L2CAP_FCS_SIZE)); 1862e1fbd4c1SMat Martineau } 1863e1fbd4c1SMat Martineau 1864e1fbd4c1SMat Martineau l2cap_do_send(chan, tx_skb); 1865e1fbd4c1SMat Martineau 1866e1fbd4c1SMat Martineau BT_DBG("Resent txseq %d", control.txseq); 1867e1fbd4c1SMat Martineau 1868e1fbd4c1SMat Martineau chan->last_acked_seq = chan->buffer_seq; 1869e1fbd4c1SMat Martineau } 1870e1fbd4c1SMat Martineau } 1871e1fbd4c1SMat Martineau 1872f80842a8SMat Martineau static void l2cap_retransmit(struct l2cap_chan *chan, 1873f80842a8SMat Martineau struct l2cap_ctrl *control) 1874f80842a8SMat Martineau { 1875f80842a8SMat Martineau BT_DBG("chan %p, control %p", chan, control); 1876f80842a8SMat Martineau 1877f80842a8SMat Martineau l2cap_seq_list_append(&chan->retrans_list, control->reqseq); 1878f80842a8SMat Martineau l2cap_ertm_resend(chan); 1879f80842a8SMat Martineau } 1880f80842a8SMat Martineau 1881d2a7ac5dSMat Martineau static void l2cap_retransmit_all(struct l2cap_chan *chan, 1882d2a7ac5dSMat Martineau struct l2cap_ctrl *control) 1883d2a7ac5dSMat Martineau { 1884e1fbd4c1SMat Martineau struct sk_buff *skb; 1885e1fbd4c1SMat Martineau 1886e1fbd4c1SMat Martineau BT_DBG("chan %p, control %p", chan, control); 1887e1fbd4c1SMat Martineau 1888e1fbd4c1SMat Martineau if (control->poll) 1889e1fbd4c1SMat Martineau set_bit(CONN_SEND_FBIT, &chan->conn_state); 1890e1fbd4c1SMat Martineau 1891e1fbd4c1SMat Martineau l2cap_seq_list_clear(&chan->retrans_list); 1892e1fbd4c1SMat Martineau 1893e1fbd4c1SMat Martineau if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) 1894e1fbd4c1SMat Martineau return; 1895e1fbd4c1SMat Martineau 1896e1fbd4c1SMat Martineau if (chan->unacked_frames) { 1897e1fbd4c1SMat Martineau skb_queue_walk(&chan->tx_q, skb) { 1898e1fbd4c1SMat Martineau if (bt_cb(skb)->control.txseq == control->reqseq || 1899e1fbd4c1SMat Martineau skb == chan->tx_send_head) 1900e1fbd4c1SMat Martineau break; 1901e1fbd4c1SMat Martineau } 1902e1fbd4c1SMat Martineau 1903e1fbd4c1SMat Martineau skb_queue_walk_from(&chan->tx_q, skb) { 1904e1fbd4c1SMat Martineau if (skb == chan->tx_send_head) 1905e1fbd4c1SMat Martineau break; 1906e1fbd4c1SMat Martineau 1907e1fbd4c1SMat Martineau l2cap_seq_list_append(&chan->retrans_list, 1908e1fbd4c1SMat Martineau bt_cb(skb)->control.txseq); 1909e1fbd4c1SMat Martineau } 1910e1fbd4c1SMat Martineau 1911e1fbd4c1SMat Martineau l2cap_ertm_resend(chan); 1912e1fbd4c1SMat Martineau } 1913d2a7ac5dSMat Martineau } 1914d2a7ac5dSMat Martineau 1915b17e73bbSSzymon Janc static void l2cap_send_ack(struct l2cap_chan *chan) 1916b17e73bbSSzymon Janc { 19170a0aba42SMat Martineau struct l2cap_ctrl control; 19180a0aba42SMat Martineau u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq, 19190a0aba42SMat Martineau chan->last_acked_seq); 19200a0aba42SMat Martineau int threshold; 19210a0aba42SMat Martineau 19220a0aba42SMat Martineau BT_DBG("chan %p last_acked_seq %d buffer_seq %d", 19230a0aba42SMat Martineau chan, chan->last_acked_seq, chan->buffer_seq); 19240a0aba42SMat Martineau 19250a0aba42SMat Martineau memset(&control, 0, sizeof(control)); 19260a0aba42SMat Martineau control.sframe = 1; 19270a0aba42SMat Martineau 19280a0aba42SMat Martineau if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && 19290a0aba42SMat Martineau chan->rx_state == L2CAP_RX_STATE_RECV) { 1930b17e73bbSSzymon Janc __clear_ack_timer(chan); 19310a0aba42SMat Martineau control.super = L2CAP_SUPER_RNR; 19320a0aba42SMat Martineau control.reqseq = chan->buffer_seq; 19330a0aba42SMat Martineau l2cap_send_sframe(chan, &control); 19340a0aba42SMat Martineau } else { 19350a0aba42SMat Martineau if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) { 19360a0aba42SMat Martineau l2cap_ertm_send(chan); 19370a0aba42SMat Martineau /* If any i-frames were sent, they included an ack */ 19380a0aba42SMat Martineau if (chan->buffer_seq == chan->last_acked_seq) 19390a0aba42SMat Martineau frames_to_ack = 0; 19400a0aba42SMat Martineau } 19410a0aba42SMat Martineau 1942c20f8e35SMat Martineau /* Ack now if the window is 3/4ths full. 19430a0aba42SMat Martineau * Calculate without mul or div 19440a0aba42SMat Martineau */ 1945c20f8e35SMat Martineau threshold = chan->ack_win; 19460a0aba42SMat Martineau threshold += threshold << 1; 19470a0aba42SMat Martineau threshold >>= 2; 19480a0aba42SMat Martineau 1949b4400672SAndrei Emeltchenko BT_DBG("frames_to_ack %u, threshold %d", frames_to_ack, 19500a0aba42SMat Martineau threshold); 19510a0aba42SMat Martineau 19520a0aba42SMat Martineau if (frames_to_ack >= threshold) { 19530a0aba42SMat Martineau __clear_ack_timer(chan); 19540a0aba42SMat Martineau control.super = L2CAP_SUPER_RR; 19550a0aba42SMat Martineau control.reqseq = chan->buffer_seq; 19560a0aba42SMat Martineau l2cap_send_sframe(chan, &control); 19570a0aba42SMat Martineau frames_to_ack = 0; 19580a0aba42SMat Martineau } 19590a0aba42SMat Martineau 19600a0aba42SMat Martineau if (frames_to_ack) 19610a0aba42SMat Martineau __set_ack_timer(chan); 19620a0aba42SMat Martineau } 1963b17e73bbSSzymon Janc } 1964b17e73bbSSzymon Janc 196504124681SGustavo F. Padovan static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan, 196604124681SGustavo F. Padovan struct msghdr *msg, int len, 196704124681SGustavo F. Padovan int count, struct sk_buff *skb) 19680a708f8fSGustavo F. Padovan { 19690952a57aSAndrei Emeltchenko struct l2cap_conn *conn = chan->conn; 19700a708f8fSGustavo F. Padovan struct sk_buff **frag; 197190338947SGustavo Padovan int sent = 0; 19720a708f8fSGustavo F. Padovan 19730a708f8fSGustavo F. Padovan if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) 19740a708f8fSGustavo F. Padovan return -EFAULT; 19750a708f8fSGustavo F. Padovan 19760a708f8fSGustavo F. Padovan sent += count; 19770a708f8fSGustavo F. Padovan len -= count; 19780a708f8fSGustavo F. Padovan 19790a708f8fSGustavo F. Padovan /* Continuation fragments (no L2CAP header) */ 19800a708f8fSGustavo F. Padovan frag = &skb_shinfo(skb)->frag_list; 19810a708f8fSGustavo F. Padovan while (len) { 1982fbe00700SGustavo Padovan struct sk_buff *tmp; 1983fbe00700SGustavo Padovan 19840a708f8fSGustavo F. Padovan count = min_t(unsigned int, conn->mtu, len); 19850a708f8fSGustavo F. Padovan 1986fbe00700SGustavo Padovan tmp = chan->ops->alloc_skb(chan, count, 198790338947SGustavo Padovan msg->msg_flags & MSG_DONTWAIT); 1988fbe00700SGustavo Padovan if (IS_ERR(tmp)) 1989fbe00700SGustavo Padovan return PTR_ERR(tmp); 19902f7719ceSAndrei Emeltchenko 1991fbe00700SGustavo Padovan *frag = tmp; 1992fbe00700SGustavo Padovan 19930a708f8fSGustavo F. Padovan if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) 19940a708f8fSGustavo F. Padovan return -EFAULT; 19950a708f8fSGustavo F. Padovan 19965e59b791SLuiz Augusto von Dentz (*frag)->priority = skb->priority; 19975e59b791SLuiz Augusto von Dentz 19980a708f8fSGustavo F. Padovan sent += count; 19990a708f8fSGustavo F. Padovan len -= count; 20000a708f8fSGustavo F. Padovan 20012d0ed3d5SGustavo Padovan skb->len += (*frag)->len; 20022d0ed3d5SGustavo Padovan skb->data_len += (*frag)->len; 20032d0ed3d5SGustavo Padovan 20040a708f8fSGustavo F. Padovan frag = &(*frag)->next; 20050a708f8fSGustavo F. Padovan } 20060a708f8fSGustavo F. Padovan 20070a708f8fSGustavo F. Padovan return sent; 20080a708f8fSGustavo F. Padovan } 20090a708f8fSGustavo F. Padovan 20105e59b791SLuiz Augusto von Dentz static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, 20115e59b791SLuiz Augusto von Dentz struct msghdr *msg, size_t len, 20125e59b791SLuiz Augusto von Dentz u32 priority) 20130a708f8fSGustavo F. Padovan { 20148c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 20150a708f8fSGustavo F. Padovan struct sk_buff *skb; 201603a51213SAndrei Emeltchenko int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE; 20170a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 20180a708f8fSGustavo F. Padovan 2019b4400672SAndrei Emeltchenko BT_DBG("chan %p len %zu priority %u", chan, len, priority); 20200a708f8fSGustavo F. Padovan 20210a708f8fSGustavo F. Padovan count = min_t(unsigned int, (conn->mtu - hlen), len); 20222f7719ceSAndrei Emeltchenko 20232f7719ceSAndrei Emeltchenko skb = chan->ops->alloc_skb(chan, count + hlen, 202490338947SGustavo Padovan msg->msg_flags & MSG_DONTWAIT); 202590338947SGustavo Padovan if (IS_ERR(skb)) 202690338947SGustavo Padovan return skb; 20270a708f8fSGustavo F. Padovan 20285e59b791SLuiz Augusto von Dentz skb->priority = priority; 20295e59b791SLuiz Augusto von Dentz 20300a708f8fSGustavo F. Padovan /* Create L2CAP header */ 20310a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 2032fe4128e0SGustavo F. Padovan lh->cid = cpu_to_le16(chan->dcid); 2033daf6a78cSAndrei Emeltchenko lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE); 2034daf6a78cSAndrei Emeltchenko put_unaligned(chan->psm, skb_put(skb, L2CAP_PSMLEN_SIZE)); 20350a708f8fSGustavo F. Padovan 20360952a57aSAndrei Emeltchenko err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); 20370a708f8fSGustavo F. Padovan if (unlikely(err < 0)) { 20380a708f8fSGustavo F. Padovan kfree_skb(skb); 20390a708f8fSGustavo F. Padovan return ERR_PTR(err); 20400a708f8fSGustavo F. Padovan } 20410a708f8fSGustavo F. Padovan return skb; 20420a708f8fSGustavo F. Padovan } 20430a708f8fSGustavo F. Padovan 20445e59b791SLuiz Augusto von Dentz static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, 20455e59b791SLuiz Augusto von Dentz struct msghdr *msg, size_t len, 20465e59b791SLuiz Augusto von Dentz u32 priority) 20470a708f8fSGustavo F. Padovan { 20488c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 20490a708f8fSGustavo F. Padovan struct sk_buff *skb; 2050f2ba7faeSGustavo Padovan int err, count; 20510a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 20520a708f8fSGustavo F. Padovan 2053b4400672SAndrei Emeltchenko BT_DBG("chan %p len %zu", chan, len); 20540a708f8fSGustavo F. Padovan 2055f2ba7faeSGustavo Padovan count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len); 20562f7719ceSAndrei Emeltchenko 2057f2ba7faeSGustavo Padovan skb = chan->ops->alloc_skb(chan, count + L2CAP_HDR_SIZE, 205890338947SGustavo Padovan msg->msg_flags & MSG_DONTWAIT); 205990338947SGustavo Padovan if (IS_ERR(skb)) 206090338947SGustavo Padovan return skb; 20610a708f8fSGustavo F. Padovan 20625e59b791SLuiz Augusto von Dentz skb->priority = priority; 20635e59b791SLuiz Augusto von Dentz 20640a708f8fSGustavo F. Padovan /* Create L2CAP header */ 20650a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 2066fe4128e0SGustavo F. Padovan lh->cid = cpu_to_le16(chan->dcid); 20676ff9b5efSGustavo Padovan lh->len = cpu_to_le16(len); 20680a708f8fSGustavo F. Padovan 20690952a57aSAndrei Emeltchenko err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); 20700a708f8fSGustavo F. Padovan if (unlikely(err < 0)) { 20710a708f8fSGustavo F. Padovan kfree_skb(skb); 20720a708f8fSGustavo F. Padovan return ERR_PTR(err); 20730a708f8fSGustavo F. Padovan } 20740a708f8fSGustavo F. Padovan return skb; 20750a708f8fSGustavo F. Padovan } 20760a708f8fSGustavo F. Padovan 2077ab0ff76dSLuiz Augusto von Dentz static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, 2078ab0ff76dSLuiz Augusto von Dentz struct msghdr *msg, size_t len, 207994122bbeSMat Martineau u16 sdulen) 20800a708f8fSGustavo F. Padovan { 20818c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 20820a708f8fSGustavo F. Padovan struct sk_buff *skb; 2083e4ca6d98SAndrei Emeltchenko int err, count, hlen; 20840a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 20850a708f8fSGustavo F. Padovan 2086b4400672SAndrei Emeltchenko BT_DBG("chan %p len %zu", chan, len); 20870a708f8fSGustavo F. Padovan 20880a708f8fSGustavo F. Padovan if (!conn) 20890a708f8fSGustavo F. Padovan return ERR_PTR(-ENOTCONN); 20900a708f8fSGustavo F. Padovan 2091ba7aa64fSGustavo Padovan hlen = __ertm_hdr_size(chan); 2092e4ca6d98SAndrei Emeltchenko 20930a708f8fSGustavo F. Padovan if (sdulen) 209403a51213SAndrei Emeltchenko hlen += L2CAP_SDULEN_SIZE; 20950a708f8fSGustavo F. Padovan 209647d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) 209703a51213SAndrei Emeltchenko hlen += L2CAP_FCS_SIZE; 20980a708f8fSGustavo F. Padovan 20990a708f8fSGustavo F. Padovan count = min_t(unsigned int, (conn->mtu - hlen), len); 21002f7719ceSAndrei Emeltchenko 21012f7719ceSAndrei Emeltchenko skb = chan->ops->alloc_skb(chan, count + hlen, 210290338947SGustavo Padovan msg->msg_flags & MSG_DONTWAIT); 210390338947SGustavo Padovan if (IS_ERR(skb)) 210490338947SGustavo Padovan return skb; 21050a708f8fSGustavo F. Padovan 21060a708f8fSGustavo F. Padovan /* Create L2CAP header */ 21070a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 2108fe4128e0SGustavo F. Padovan lh->cid = cpu_to_le16(chan->dcid); 21090a708f8fSGustavo F. Padovan lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); 211088843ab0SAndrei Emeltchenko 211118a48e76SMat Martineau /* Control header is populated later */ 211218a48e76SMat Martineau if (test_bit(FLAG_EXT_CTRL, &chan->flags)) 211318a48e76SMat Martineau put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); 211418a48e76SMat Martineau else 211518a48e76SMat Martineau put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); 211688843ab0SAndrei Emeltchenko 21170a708f8fSGustavo F. Padovan if (sdulen) 211803a51213SAndrei Emeltchenko put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE)); 21190a708f8fSGustavo F. Padovan 21200952a57aSAndrei Emeltchenko err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); 21210a708f8fSGustavo F. Padovan if (unlikely(err < 0)) { 21220a708f8fSGustavo F. Padovan kfree_skb(skb); 21230a708f8fSGustavo F. Padovan return ERR_PTR(err); 21240a708f8fSGustavo F. Padovan } 21250a708f8fSGustavo F. Padovan 212618a48e76SMat Martineau bt_cb(skb)->control.fcs = chan->fcs; 21273ce3514fSMat Martineau bt_cb(skb)->control.retries = 0; 21280a708f8fSGustavo F. Padovan return skb; 21290a708f8fSGustavo F. Padovan } 21300a708f8fSGustavo F. Padovan 213194122bbeSMat Martineau static int l2cap_segment_sdu(struct l2cap_chan *chan, 213294122bbeSMat Martineau struct sk_buff_head *seg_queue, 213394122bbeSMat Martineau struct msghdr *msg, size_t len) 21340a708f8fSGustavo F. Padovan { 21350a708f8fSGustavo F. Padovan struct sk_buff *skb; 213694122bbeSMat Martineau u16 sdu_len; 213794122bbeSMat Martineau size_t pdu_len; 213894122bbeSMat Martineau u8 sar; 21390a708f8fSGustavo F. Padovan 2140b4400672SAndrei Emeltchenko BT_DBG("chan %p, msg %p, len %zu", chan, msg, len); 21410a708f8fSGustavo F. Padovan 214294122bbeSMat Martineau /* It is critical that ERTM PDUs fit in a single HCI fragment, 214394122bbeSMat Martineau * so fragmented skbs are not used. The HCI layer's handling 214494122bbeSMat Martineau * of fragmented skbs is not compatible with ERTM's queueing. 214594122bbeSMat Martineau */ 214694122bbeSMat Martineau 214794122bbeSMat Martineau /* PDU size is derived from the HCI MTU */ 214894122bbeSMat Martineau pdu_len = chan->conn->mtu; 214994122bbeSMat Martineau 215094122bbeSMat Martineau pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD); 215194122bbeSMat Martineau 215294122bbeSMat Martineau /* Adjust for largest possible L2CAP overhead. */ 215335d401dfSGustavo Padovan if (chan->fcs) 215435d401dfSGustavo Padovan pdu_len -= L2CAP_FCS_SIZE; 215535d401dfSGustavo Padovan 2156ba7aa64fSGustavo Padovan pdu_len -= __ertm_hdr_size(chan); 215794122bbeSMat Martineau 215894122bbeSMat Martineau /* Remote device may have requested smaller PDUs */ 215994122bbeSMat Martineau pdu_len = min_t(size_t, pdu_len, chan->remote_mps); 216094122bbeSMat Martineau 216194122bbeSMat Martineau if (len <= pdu_len) { 216294122bbeSMat Martineau sar = L2CAP_SAR_UNSEGMENTED; 216394122bbeSMat Martineau sdu_len = 0; 216494122bbeSMat Martineau pdu_len = len; 216594122bbeSMat Martineau } else { 216694122bbeSMat Martineau sar = L2CAP_SAR_START; 216794122bbeSMat Martineau sdu_len = len; 216894122bbeSMat Martineau pdu_len -= L2CAP_SDULEN_SIZE; 216994122bbeSMat Martineau } 21700a708f8fSGustavo F. Padovan 21710a708f8fSGustavo F. Padovan while (len > 0) { 217294122bbeSMat Martineau skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len); 21730a708f8fSGustavo F. Padovan 21740a708f8fSGustavo F. Padovan if (IS_ERR(skb)) { 217594122bbeSMat Martineau __skb_queue_purge(seg_queue); 21760a708f8fSGustavo F. Padovan return PTR_ERR(skb); 21770a708f8fSGustavo F. Padovan } 21780a708f8fSGustavo F. Padovan 217994122bbeSMat Martineau bt_cb(skb)->control.sar = sar; 218094122bbeSMat Martineau __skb_queue_tail(seg_queue, skb); 21810a708f8fSGustavo F. Padovan 218294122bbeSMat Martineau len -= pdu_len; 218394122bbeSMat Martineau if (sdu_len) { 218494122bbeSMat Martineau sdu_len = 0; 218594122bbeSMat Martineau pdu_len += L2CAP_SDULEN_SIZE; 218694122bbeSMat Martineau } 218794122bbeSMat Martineau 218894122bbeSMat Martineau if (len <= pdu_len) { 218994122bbeSMat Martineau sar = L2CAP_SAR_END; 219094122bbeSMat Martineau pdu_len = len; 219194122bbeSMat Martineau } else { 219294122bbeSMat Martineau sar = L2CAP_SAR_CONTINUE; 219394122bbeSMat Martineau } 219494122bbeSMat Martineau } 219594122bbeSMat Martineau 2196f0f62799SGustavo Padovan return 0; 21970a708f8fSGustavo F. Padovan } 21980a708f8fSGustavo F. Padovan 21995e59b791SLuiz Augusto von Dentz int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len, 22005e59b791SLuiz Augusto von Dentz u32 priority) 22019a91a04aSGustavo F. Padovan { 22029a91a04aSGustavo F. Padovan struct sk_buff *skb; 22039a91a04aSGustavo F. Padovan int err; 220494122bbeSMat Martineau struct sk_buff_head seg_queue; 22059a91a04aSGustavo F. Padovan 22069a91a04aSGustavo F. Padovan /* Connectionless channel */ 2207715ec005SGustavo F. Padovan if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { 22085e59b791SLuiz Augusto von Dentz skb = l2cap_create_connless_pdu(chan, msg, len, priority); 22099a91a04aSGustavo F. Padovan if (IS_ERR(skb)) 22109a91a04aSGustavo F. Padovan return PTR_ERR(skb); 22119a91a04aSGustavo F. Padovan 22129a91a04aSGustavo F. Padovan l2cap_do_send(chan, skb); 22139a91a04aSGustavo F. Padovan return len; 22149a91a04aSGustavo F. Padovan } 22159a91a04aSGustavo F. Padovan 22169a91a04aSGustavo F. Padovan switch (chan->mode) { 22179a91a04aSGustavo F. Padovan case L2CAP_MODE_BASIC: 22189a91a04aSGustavo F. Padovan /* Check outgoing MTU */ 22199a91a04aSGustavo F. Padovan if (len > chan->omtu) 22209a91a04aSGustavo F. Padovan return -EMSGSIZE; 22219a91a04aSGustavo F. Padovan 22229a91a04aSGustavo F. Padovan /* Create a basic PDU */ 22235e59b791SLuiz Augusto von Dentz skb = l2cap_create_basic_pdu(chan, msg, len, priority); 22249a91a04aSGustavo F. Padovan if (IS_ERR(skb)) 22259a91a04aSGustavo F. Padovan return PTR_ERR(skb); 22269a91a04aSGustavo F. Padovan 22279a91a04aSGustavo F. Padovan l2cap_do_send(chan, skb); 22289a91a04aSGustavo F. Padovan err = len; 22299a91a04aSGustavo F. Padovan break; 22309a91a04aSGustavo F. Padovan 22319a91a04aSGustavo F. Padovan case L2CAP_MODE_ERTM: 22329a91a04aSGustavo F. Padovan case L2CAP_MODE_STREAMING: 223394122bbeSMat Martineau /* Check outgoing MTU */ 223494122bbeSMat Martineau if (len > chan->omtu) { 223594122bbeSMat Martineau err = -EMSGSIZE; 22369a91a04aSGustavo F. Padovan break; 22379a91a04aSGustavo F. Padovan } 22389a91a04aSGustavo F. Padovan 223994122bbeSMat Martineau __skb_queue_head_init(&seg_queue); 224094122bbeSMat Martineau 224194122bbeSMat Martineau /* Do segmentation before calling in to the state machine, 224294122bbeSMat Martineau * since it's possible to block while waiting for memory 224394122bbeSMat Martineau * allocation. 224494122bbeSMat Martineau */ 224594122bbeSMat Martineau err = l2cap_segment_sdu(chan, &seg_queue, msg, len); 224694122bbeSMat Martineau 224794122bbeSMat Martineau /* The channel could have been closed while segmenting, 224894122bbeSMat Martineau * check that it is still connected. 224994122bbeSMat Martineau */ 225094122bbeSMat Martineau if (chan->state != BT_CONNECTED) { 225194122bbeSMat Martineau __skb_queue_purge(&seg_queue); 225294122bbeSMat Martineau err = -ENOTCONN; 22539a91a04aSGustavo F. Padovan } 22549a91a04aSGustavo F. Padovan 225594122bbeSMat Martineau if (err) 225694122bbeSMat Martineau break; 225794122bbeSMat Martineau 22583733937dSMat Martineau if (chan->mode == L2CAP_MODE_ERTM) 2259d660366dSGustavo Padovan l2cap_tx(chan, NULL, &seg_queue, L2CAP_EV_DATA_REQUEST); 22603733937dSMat Martineau else 2261d660366dSGustavo Padovan l2cap_streaming_send(chan, &seg_queue); 226294122bbeSMat Martineau 22639a91a04aSGustavo F. Padovan err = len; 22649a91a04aSGustavo F. Padovan 226594122bbeSMat Martineau /* If the skbs were not queued for sending, they'll still be in 226694122bbeSMat Martineau * seg_queue and need to be purged. 226794122bbeSMat Martineau */ 226894122bbeSMat Martineau __skb_queue_purge(&seg_queue); 22699a91a04aSGustavo F. Padovan break; 22709a91a04aSGustavo F. Padovan 22719a91a04aSGustavo F. Padovan default: 22729a91a04aSGustavo F. Padovan BT_DBG("bad state %1.1x", chan->mode); 22739a91a04aSGustavo F. Padovan err = -EBADFD; 22749a91a04aSGustavo F. Padovan } 22759a91a04aSGustavo F. Padovan 22769a91a04aSGustavo F. Padovan return err; 22779a91a04aSGustavo F. Padovan } 22789a91a04aSGustavo F. Padovan 2279d2a7ac5dSMat Martineau static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq) 2280d2a7ac5dSMat Martineau { 2281bed68bdeSMat Martineau struct l2cap_ctrl control; 2282bed68bdeSMat Martineau u16 seq; 2283bed68bdeSMat Martineau 2284b4400672SAndrei Emeltchenko BT_DBG("chan %p, txseq %u", chan, txseq); 2285bed68bdeSMat Martineau 2286bed68bdeSMat Martineau memset(&control, 0, sizeof(control)); 2287bed68bdeSMat Martineau control.sframe = 1; 2288bed68bdeSMat Martineau control.super = L2CAP_SUPER_SREJ; 2289bed68bdeSMat Martineau 2290bed68bdeSMat Martineau for (seq = chan->expected_tx_seq; seq != txseq; 2291bed68bdeSMat Martineau seq = __next_seq(chan, seq)) { 2292bed68bdeSMat Martineau if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) { 2293bed68bdeSMat Martineau control.reqseq = seq; 2294bed68bdeSMat Martineau l2cap_send_sframe(chan, &control); 2295bed68bdeSMat Martineau l2cap_seq_list_append(&chan->srej_list, seq); 2296bed68bdeSMat Martineau } 2297bed68bdeSMat Martineau } 2298bed68bdeSMat Martineau 2299bed68bdeSMat Martineau chan->expected_tx_seq = __next_seq(chan, txseq); 2300d2a7ac5dSMat Martineau } 2301d2a7ac5dSMat Martineau 2302d2a7ac5dSMat Martineau static void l2cap_send_srej_tail(struct l2cap_chan *chan) 2303d2a7ac5dSMat Martineau { 2304bed68bdeSMat Martineau struct l2cap_ctrl control; 2305bed68bdeSMat Martineau 2306bed68bdeSMat Martineau BT_DBG("chan %p", chan); 2307bed68bdeSMat Martineau 2308bed68bdeSMat Martineau if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR) 2309bed68bdeSMat Martineau return; 2310bed68bdeSMat Martineau 2311bed68bdeSMat Martineau memset(&control, 0, sizeof(control)); 2312bed68bdeSMat Martineau control.sframe = 1; 2313bed68bdeSMat Martineau control.super = L2CAP_SUPER_SREJ; 2314bed68bdeSMat Martineau control.reqseq = chan->srej_list.tail; 2315bed68bdeSMat Martineau l2cap_send_sframe(chan, &control); 2316d2a7ac5dSMat Martineau } 2317d2a7ac5dSMat Martineau 2318d2a7ac5dSMat Martineau static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq) 2319d2a7ac5dSMat Martineau { 2320bed68bdeSMat Martineau struct l2cap_ctrl control; 2321bed68bdeSMat Martineau u16 initial_head; 2322bed68bdeSMat Martineau u16 seq; 2323bed68bdeSMat Martineau 2324b4400672SAndrei Emeltchenko BT_DBG("chan %p, txseq %u", chan, txseq); 2325bed68bdeSMat Martineau 2326bed68bdeSMat Martineau memset(&control, 0, sizeof(control)); 2327bed68bdeSMat Martineau control.sframe = 1; 2328bed68bdeSMat Martineau control.super = L2CAP_SUPER_SREJ; 2329bed68bdeSMat Martineau 2330bed68bdeSMat Martineau /* Capture initial list head to allow only one pass through the list. */ 2331bed68bdeSMat Martineau initial_head = chan->srej_list.head; 2332bed68bdeSMat Martineau 2333bed68bdeSMat Martineau do { 2334bed68bdeSMat Martineau seq = l2cap_seq_list_pop(&chan->srej_list); 2335bed68bdeSMat Martineau if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR) 2336bed68bdeSMat Martineau break; 2337bed68bdeSMat Martineau 2338bed68bdeSMat Martineau control.reqseq = seq; 2339bed68bdeSMat Martineau l2cap_send_sframe(chan, &control); 2340bed68bdeSMat Martineau l2cap_seq_list_append(&chan->srej_list, seq); 2341bed68bdeSMat Martineau } while (chan->srej_list.head != initial_head); 2342d2a7ac5dSMat Martineau } 2343d2a7ac5dSMat Martineau 2344608bcc6dSMat Martineau static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq) 2345608bcc6dSMat Martineau { 2346608bcc6dSMat Martineau struct sk_buff *acked_skb; 2347608bcc6dSMat Martineau u16 ackseq; 2348608bcc6dSMat Martineau 2349b4400672SAndrei Emeltchenko BT_DBG("chan %p, reqseq %u", chan, reqseq); 2350608bcc6dSMat Martineau 2351608bcc6dSMat Martineau if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq) 2352608bcc6dSMat Martineau return; 2353608bcc6dSMat Martineau 2354b4400672SAndrei Emeltchenko BT_DBG("expected_ack_seq %u, unacked_frames %u", 2355608bcc6dSMat Martineau chan->expected_ack_seq, chan->unacked_frames); 2356608bcc6dSMat Martineau 2357608bcc6dSMat Martineau for (ackseq = chan->expected_ack_seq; ackseq != reqseq; 2358608bcc6dSMat Martineau ackseq = __next_seq(chan, ackseq)) { 2359608bcc6dSMat Martineau 2360608bcc6dSMat Martineau acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq); 2361608bcc6dSMat Martineau if (acked_skb) { 2362608bcc6dSMat Martineau skb_unlink(acked_skb, &chan->tx_q); 2363608bcc6dSMat Martineau kfree_skb(acked_skb); 2364608bcc6dSMat Martineau chan->unacked_frames--; 2365608bcc6dSMat Martineau } 2366608bcc6dSMat Martineau } 2367608bcc6dSMat Martineau 2368608bcc6dSMat Martineau chan->expected_ack_seq = reqseq; 2369608bcc6dSMat Martineau 2370608bcc6dSMat Martineau if (chan->unacked_frames == 0) 2371608bcc6dSMat Martineau __clear_retrans_timer(chan); 2372608bcc6dSMat Martineau 2373b4400672SAndrei Emeltchenko BT_DBG("unacked_frames %u", chan->unacked_frames); 2374608bcc6dSMat Martineau } 2375608bcc6dSMat Martineau 2376608bcc6dSMat Martineau static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan) 2377608bcc6dSMat Martineau { 2378608bcc6dSMat Martineau BT_DBG("chan %p", chan); 2379608bcc6dSMat Martineau 2380608bcc6dSMat Martineau chan->expected_tx_seq = chan->buffer_seq; 2381608bcc6dSMat Martineau l2cap_seq_list_clear(&chan->srej_list); 2382608bcc6dSMat Martineau skb_queue_purge(&chan->srej_q); 2383608bcc6dSMat Martineau chan->rx_state = L2CAP_RX_STATE_RECV; 2384608bcc6dSMat Martineau } 2385608bcc6dSMat Martineau 2386d660366dSGustavo Padovan static void l2cap_tx_state_xmit(struct l2cap_chan *chan, 2387608bcc6dSMat Martineau struct l2cap_ctrl *control, 2388608bcc6dSMat Martineau struct sk_buff_head *skbs, u8 event) 2389608bcc6dSMat Martineau { 2390608bcc6dSMat Martineau BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, 2391608bcc6dSMat Martineau event); 2392608bcc6dSMat Martineau 2393608bcc6dSMat Martineau switch (event) { 2394608bcc6dSMat Martineau case L2CAP_EV_DATA_REQUEST: 2395608bcc6dSMat Martineau if (chan->tx_send_head == NULL) 2396608bcc6dSMat Martineau chan->tx_send_head = skb_peek(skbs); 2397608bcc6dSMat Martineau 2398608bcc6dSMat Martineau skb_queue_splice_tail_init(skbs, &chan->tx_q); 2399608bcc6dSMat Martineau l2cap_ertm_send(chan); 2400608bcc6dSMat Martineau break; 2401608bcc6dSMat Martineau case L2CAP_EV_LOCAL_BUSY_DETECTED: 2402608bcc6dSMat Martineau BT_DBG("Enter LOCAL_BUSY"); 2403608bcc6dSMat Martineau set_bit(CONN_LOCAL_BUSY, &chan->conn_state); 2404608bcc6dSMat Martineau 2405608bcc6dSMat Martineau if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { 2406608bcc6dSMat Martineau /* The SREJ_SENT state must be aborted if we are to 2407608bcc6dSMat Martineau * enter the LOCAL_BUSY state. 2408608bcc6dSMat Martineau */ 2409608bcc6dSMat Martineau l2cap_abort_rx_srej_sent(chan); 2410608bcc6dSMat Martineau } 2411608bcc6dSMat Martineau 2412608bcc6dSMat Martineau l2cap_send_ack(chan); 2413608bcc6dSMat Martineau 2414608bcc6dSMat Martineau break; 2415608bcc6dSMat Martineau case L2CAP_EV_LOCAL_BUSY_CLEAR: 2416608bcc6dSMat Martineau BT_DBG("Exit LOCAL_BUSY"); 2417608bcc6dSMat Martineau clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); 2418608bcc6dSMat Martineau 2419608bcc6dSMat Martineau if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { 2420608bcc6dSMat Martineau struct l2cap_ctrl local_control; 2421608bcc6dSMat Martineau 2422608bcc6dSMat Martineau memset(&local_control, 0, sizeof(local_control)); 2423608bcc6dSMat Martineau local_control.sframe = 1; 2424608bcc6dSMat Martineau local_control.super = L2CAP_SUPER_RR; 2425608bcc6dSMat Martineau local_control.poll = 1; 2426608bcc6dSMat Martineau local_control.reqseq = chan->buffer_seq; 2427a67d7f6fSMat Martineau l2cap_send_sframe(chan, &local_control); 2428608bcc6dSMat Martineau 2429608bcc6dSMat Martineau chan->retry_count = 1; 2430608bcc6dSMat Martineau __set_monitor_timer(chan); 2431608bcc6dSMat Martineau chan->tx_state = L2CAP_TX_STATE_WAIT_F; 2432608bcc6dSMat Martineau } 2433608bcc6dSMat Martineau break; 2434608bcc6dSMat Martineau case L2CAP_EV_RECV_REQSEQ_AND_FBIT: 2435608bcc6dSMat Martineau l2cap_process_reqseq(chan, control->reqseq); 2436608bcc6dSMat Martineau break; 2437608bcc6dSMat Martineau case L2CAP_EV_EXPLICIT_POLL: 2438608bcc6dSMat Martineau l2cap_send_rr_or_rnr(chan, 1); 2439608bcc6dSMat Martineau chan->retry_count = 1; 2440608bcc6dSMat Martineau __set_monitor_timer(chan); 2441608bcc6dSMat Martineau __clear_ack_timer(chan); 2442608bcc6dSMat Martineau chan->tx_state = L2CAP_TX_STATE_WAIT_F; 2443608bcc6dSMat Martineau break; 2444608bcc6dSMat Martineau case L2CAP_EV_RETRANS_TO: 2445608bcc6dSMat Martineau l2cap_send_rr_or_rnr(chan, 1); 2446608bcc6dSMat Martineau chan->retry_count = 1; 2447608bcc6dSMat Martineau __set_monitor_timer(chan); 2448608bcc6dSMat Martineau chan->tx_state = L2CAP_TX_STATE_WAIT_F; 2449608bcc6dSMat Martineau break; 2450608bcc6dSMat Martineau case L2CAP_EV_RECV_FBIT: 2451608bcc6dSMat Martineau /* Nothing to process */ 2452608bcc6dSMat Martineau break; 2453608bcc6dSMat Martineau default: 2454608bcc6dSMat Martineau break; 2455608bcc6dSMat Martineau } 2456608bcc6dSMat Martineau } 2457608bcc6dSMat Martineau 2458d660366dSGustavo Padovan static void l2cap_tx_state_wait_f(struct l2cap_chan *chan, 2459608bcc6dSMat Martineau struct l2cap_ctrl *control, 2460608bcc6dSMat Martineau struct sk_buff_head *skbs, u8 event) 2461608bcc6dSMat Martineau { 2462608bcc6dSMat Martineau BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, 2463608bcc6dSMat Martineau event); 2464608bcc6dSMat Martineau 2465608bcc6dSMat Martineau switch (event) { 2466608bcc6dSMat Martineau case L2CAP_EV_DATA_REQUEST: 2467608bcc6dSMat Martineau if (chan->tx_send_head == NULL) 2468608bcc6dSMat Martineau chan->tx_send_head = skb_peek(skbs); 2469608bcc6dSMat Martineau /* Queue data, but don't send. */ 2470608bcc6dSMat Martineau skb_queue_splice_tail_init(skbs, &chan->tx_q); 2471608bcc6dSMat Martineau break; 2472608bcc6dSMat Martineau case L2CAP_EV_LOCAL_BUSY_DETECTED: 2473608bcc6dSMat Martineau BT_DBG("Enter LOCAL_BUSY"); 2474608bcc6dSMat Martineau set_bit(CONN_LOCAL_BUSY, &chan->conn_state); 2475608bcc6dSMat Martineau 2476608bcc6dSMat Martineau if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { 2477608bcc6dSMat Martineau /* The SREJ_SENT state must be aborted if we are to 2478608bcc6dSMat Martineau * enter the LOCAL_BUSY state. 2479608bcc6dSMat Martineau */ 2480608bcc6dSMat Martineau l2cap_abort_rx_srej_sent(chan); 2481608bcc6dSMat Martineau } 2482608bcc6dSMat Martineau 2483608bcc6dSMat Martineau l2cap_send_ack(chan); 2484608bcc6dSMat Martineau 2485608bcc6dSMat Martineau break; 2486608bcc6dSMat Martineau case L2CAP_EV_LOCAL_BUSY_CLEAR: 2487608bcc6dSMat Martineau BT_DBG("Exit LOCAL_BUSY"); 2488608bcc6dSMat Martineau clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); 2489608bcc6dSMat Martineau 2490608bcc6dSMat Martineau if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { 2491608bcc6dSMat Martineau struct l2cap_ctrl local_control; 2492608bcc6dSMat Martineau memset(&local_control, 0, sizeof(local_control)); 2493608bcc6dSMat Martineau local_control.sframe = 1; 2494608bcc6dSMat Martineau local_control.super = L2CAP_SUPER_RR; 2495608bcc6dSMat Martineau local_control.poll = 1; 2496608bcc6dSMat Martineau local_control.reqseq = chan->buffer_seq; 2497a67d7f6fSMat Martineau l2cap_send_sframe(chan, &local_control); 2498608bcc6dSMat Martineau 2499608bcc6dSMat Martineau chan->retry_count = 1; 2500608bcc6dSMat Martineau __set_monitor_timer(chan); 2501608bcc6dSMat Martineau chan->tx_state = L2CAP_TX_STATE_WAIT_F; 2502608bcc6dSMat Martineau } 2503608bcc6dSMat Martineau break; 2504608bcc6dSMat Martineau case L2CAP_EV_RECV_REQSEQ_AND_FBIT: 2505608bcc6dSMat Martineau l2cap_process_reqseq(chan, control->reqseq); 2506608bcc6dSMat Martineau 2507608bcc6dSMat Martineau /* Fall through */ 2508608bcc6dSMat Martineau 2509608bcc6dSMat Martineau case L2CAP_EV_RECV_FBIT: 2510608bcc6dSMat Martineau if (control && control->final) { 2511608bcc6dSMat Martineau __clear_monitor_timer(chan); 2512608bcc6dSMat Martineau if (chan->unacked_frames > 0) 2513608bcc6dSMat Martineau __set_retrans_timer(chan); 2514608bcc6dSMat Martineau chan->retry_count = 0; 2515608bcc6dSMat Martineau chan->tx_state = L2CAP_TX_STATE_XMIT; 2516608bcc6dSMat Martineau BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state); 2517608bcc6dSMat Martineau } 2518608bcc6dSMat Martineau break; 2519608bcc6dSMat Martineau case L2CAP_EV_EXPLICIT_POLL: 2520608bcc6dSMat Martineau /* Ignore */ 2521608bcc6dSMat Martineau break; 2522608bcc6dSMat Martineau case L2CAP_EV_MONITOR_TO: 2523608bcc6dSMat Martineau if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) { 2524608bcc6dSMat Martineau l2cap_send_rr_or_rnr(chan, 1); 2525608bcc6dSMat Martineau __set_monitor_timer(chan); 2526608bcc6dSMat Martineau chan->retry_count++; 2527608bcc6dSMat Martineau } else { 2528608bcc6dSMat Martineau l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); 2529608bcc6dSMat Martineau } 2530608bcc6dSMat Martineau break; 2531608bcc6dSMat Martineau default: 2532608bcc6dSMat Martineau break; 2533608bcc6dSMat Martineau } 2534608bcc6dSMat Martineau } 2535608bcc6dSMat Martineau 2536d660366dSGustavo Padovan static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, 2537608bcc6dSMat Martineau struct sk_buff_head *skbs, u8 event) 2538608bcc6dSMat Martineau { 2539608bcc6dSMat Martineau BT_DBG("chan %p, control %p, skbs %p, event %d, state %d", 2540608bcc6dSMat Martineau chan, control, skbs, event, chan->tx_state); 2541608bcc6dSMat Martineau 2542608bcc6dSMat Martineau switch (chan->tx_state) { 2543608bcc6dSMat Martineau case L2CAP_TX_STATE_XMIT: 2544d660366dSGustavo Padovan l2cap_tx_state_xmit(chan, control, skbs, event); 2545608bcc6dSMat Martineau break; 2546608bcc6dSMat Martineau case L2CAP_TX_STATE_WAIT_F: 2547d660366dSGustavo Padovan l2cap_tx_state_wait_f(chan, control, skbs, event); 2548608bcc6dSMat Martineau break; 2549608bcc6dSMat Martineau default: 2550608bcc6dSMat Martineau /* Ignore event */ 2551608bcc6dSMat Martineau break; 2552608bcc6dSMat Martineau } 2553608bcc6dSMat Martineau } 2554608bcc6dSMat Martineau 25554b51dae9SMat Martineau static void l2cap_pass_to_tx(struct l2cap_chan *chan, 25564b51dae9SMat Martineau struct l2cap_ctrl *control) 25574b51dae9SMat Martineau { 25584b51dae9SMat Martineau BT_DBG("chan %p, control %p", chan, control); 2559401bb1f7SAndrei Emeltchenko l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_REQSEQ_AND_FBIT); 25604b51dae9SMat Martineau } 25614b51dae9SMat Martineau 2562f80842a8SMat Martineau static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan, 2563f80842a8SMat Martineau struct l2cap_ctrl *control) 2564f80842a8SMat Martineau { 2565f80842a8SMat Martineau BT_DBG("chan %p, control %p", chan, control); 2566401bb1f7SAndrei Emeltchenko l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_FBIT); 2567f80842a8SMat Martineau } 2568f80842a8SMat Martineau 25690a708f8fSGustavo F. Padovan /* Copy frame to all raw sockets on that connection */ 25700a708f8fSGustavo F. Padovan static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) 25710a708f8fSGustavo F. Padovan { 25720a708f8fSGustavo F. Padovan struct sk_buff *nskb; 257348454079SGustavo F. Padovan struct l2cap_chan *chan; 25740a708f8fSGustavo F. Padovan 25750a708f8fSGustavo F. Padovan BT_DBG("conn %p", conn); 25760a708f8fSGustavo F. Padovan 25773df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 25783d57dc68SGustavo F. Padovan 25793df91ea2SAndrei Emeltchenko list_for_each_entry(chan, &conn->chan_l, list) { 258048454079SGustavo F. Padovan struct sock *sk = chan->sk; 2581715ec005SGustavo F. Padovan if (chan->chan_type != L2CAP_CHAN_RAW) 25820a708f8fSGustavo F. Padovan continue; 25830a708f8fSGustavo F. Padovan 25840a708f8fSGustavo F. Padovan /* Don't send frame to the socket it came from */ 25850a708f8fSGustavo F. Padovan if (skb->sk == sk) 25860a708f8fSGustavo F. Padovan continue; 25878bcde1f2SGustavo Padovan nskb = skb_clone(skb, GFP_KERNEL); 25880a708f8fSGustavo F. Padovan if (!nskb) 25890a708f8fSGustavo F. Padovan continue; 25900a708f8fSGustavo F. Padovan 259180b98027SGustavo Padovan if (chan->ops->recv(chan, nskb)) 25920a708f8fSGustavo F. Padovan kfree_skb(nskb); 25930a708f8fSGustavo F. Padovan } 25943d57dc68SGustavo F. Padovan 25953df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 25960a708f8fSGustavo F. Padovan } 25970a708f8fSGustavo F. Padovan 25980a708f8fSGustavo F. Padovan /* ---- L2CAP signalling commands ---- */ 2599b4400672SAndrei Emeltchenko static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code, 2600b4400672SAndrei Emeltchenko u8 ident, u16 dlen, void *data) 26010a708f8fSGustavo F. Padovan { 26020a708f8fSGustavo F. Padovan struct sk_buff *skb, **frag; 26030a708f8fSGustavo F. Padovan struct l2cap_cmd_hdr *cmd; 26040a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 26050a708f8fSGustavo F. Padovan int len, count; 26060a708f8fSGustavo F. Padovan 2607b4400672SAndrei Emeltchenko BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %u", 26080a708f8fSGustavo F. Padovan conn, code, ident, dlen); 26090a708f8fSGustavo F. Padovan 26100a708f8fSGustavo F. Padovan len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; 26110a708f8fSGustavo F. Padovan count = min_t(unsigned int, conn->mtu, len); 26120a708f8fSGustavo F. Padovan 26138bcde1f2SGustavo Padovan skb = bt_skb_alloc(count, GFP_KERNEL); 26140a708f8fSGustavo F. Padovan if (!skb) 26150a708f8fSGustavo F. Padovan return NULL; 26160a708f8fSGustavo F. Padovan 26170a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 26180a708f8fSGustavo F. Padovan lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); 26193300d9a9SClaudio Takahasi 26203300d9a9SClaudio Takahasi if (conn->hcon->type == LE_LINK) 2621ac73498cSAndrei Emeltchenko lh->cid = __constant_cpu_to_le16(L2CAP_CID_LE_SIGNALING); 26223300d9a9SClaudio Takahasi else 2623ac73498cSAndrei Emeltchenko lh->cid = __constant_cpu_to_le16(L2CAP_CID_SIGNALING); 26240a708f8fSGustavo F. Padovan 26250a708f8fSGustavo F. Padovan cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); 26260a708f8fSGustavo F. Padovan cmd->code = code; 26270a708f8fSGustavo F. Padovan cmd->ident = ident; 26280a708f8fSGustavo F. Padovan cmd->len = cpu_to_le16(dlen); 26290a708f8fSGustavo F. Padovan 26300a708f8fSGustavo F. Padovan if (dlen) { 26310a708f8fSGustavo F. Padovan count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; 26320a708f8fSGustavo F. Padovan memcpy(skb_put(skb, count), data, count); 26330a708f8fSGustavo F. Padovan data += count; 26340a708f8fSGustavo F. Padovan } 26350a708f8fSGustavo F. Padovan 26360a708f8fSGustavo F. Padovan len -= skb->len; 26370a708f8fSGustavo F. Padovan 26380a708f8fSGustavo F. Padovan /* Continuation fragments (no L2CAP header) */ 26390a708f8fSGustavo F. Padovan frag = &skb_shinfo(skb)->frag_list; 26400a708f8fSGustavo F. Padovan while (len) { 26410a708f8fSGustavo F. Padovan count = min_t(unsigned int, conn->mtu, len); 26420a708f8fSGustavo F. Padovan 26438bcde1f2SGustavo Padovan *frag = bt_skb_alloc(count, GFP_KERNEL); 26440a708f8fSGustavo F. Padovan if (!*frag) 26450a708f8fSGustavo F. Padovan goto fail; 26460a708f8fSGustavo F. Padovan 26470a708f8fSGustavo F. Padovan memcpy(skb_put(*frag, count), data, count); 26480a708f8fSGustavo F. Padovan 26490a708f8fSGustavo F. Padovan len -= count; 26500a708f8fSGustavo F. Padovan data += count; 26510a708f8fSGustavo F. Padovan 26520a708f8fSGustavo F. Padovan frag = &(*frag)->next; 26530a708f8fSGustavo F. Padovan } 26540a708f8fSGustavo F. Padovan 26550a708f8fSGustavo F. Padovan return skb; 26560a708f8fSGustavo F. Padovan 26570a708f8fSGustavo F. Padovan fail: 26580a708f8fSGustavo F. Padovan kfree_skb(skb); 26590a708f8fSGustavo F. Padovan return NULL; 26600a708f8fSGustavo F. Padovan } 26610a708f8fSGustavo F. Padovan 26622d792818SGustavo Padovan static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, 26632d792818SGustavo Padovan unsigned long *val) 26640a708f8fSGustavo F. Padovan { 26650a708f8fSGustavo F. Padovan struct l2cap_conf_opt *opt = *ptr; 26660a708f8fSGustavo F. Padovan int len; 26670a708f8fSGustavo F. Padovan 26680a708f8fSGustavo F. Padovan len = L2CAP_CONF_OPT_SIZE + opt->len; 26690a708f8fSGustavo F. Padovan *ptr += len; 26700a708f8fSGustavo F. Padovan 26710a708f8fSGustavo F. Padovan *type = opt->type; 26720a708f8fSGustavo F. Padovan *olen = opt->len; 26730a708f8fSGustavo F. Padovan 26740a708f8fSGustavo F. Padovan switch (opt->len) { 26750a708f8fSGustavo F. Padovan case 1: 26760a708f8fSGustavo F. Padovan *val = *((u8 *) opt->val); 26770a708f8fSGustavo F. Padovan break; 26780a708f8fSGustavo F. Padovan 26790a708f8fSGustavo F. Padovan case 2: 26800a708f8fSGustavo F. Padovan *val = get_unaligned_le16(opt->val); 26810a708f8fSGustavo F. Padovan break; 26820a708f8fSGustavo F. Padovan 26830a708f8fSGustavo F. Padovan case 4: 26840a708f8fSGustavo F. Padovan *val = get_unaligned_le32(opt->val); 26850a708f8fSGustavo F. Padovan break; 26860a708f8fSGustavo F. Padovan 26870a708f8fSGustavo F. Padovan default: 26880a708f8fSGustavo F. Padovan *val = (unsigned long) opt->val; 26890a708f8fSGustavo F. Padovan break; 26900a708f8fSGustavo F. Padovan } 26910a708f8fSGustavo F. Padovan 2692b4400672SAndrei Emeltchenko BT_DBG("type 0x%2.2x len %u val 0x%lx", *type, opt->len, *val); 26930a708f8fSGustavo F. Padovan return len; 26940a708f8fSGustavo F. Padovan } 26950a708f8fSGustavo F. Padovan 26960a708f8fSGustavo F. Padovan static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) 26970a708f8fSGustavo F. Padovan { 26980a708f8fSGustavo F. Padovan struct l2cap_conf_opt *opt = *ptr; 26990a708f8fSGustavo F. Padovan 2700b4400672SAndrei Emeltchenko BT_DBG("type 0x%2.2x len %u val 0x%lx", type, len, val); 27010a708f8fSGustavo F. Padovan 27020a708f8fSGustavo F. Padovan opt->type = type; 27030a708f8fSGustavo F. Padovan opt->len = len; 27040a708f8fSGustavo F. Padovan 27050a708f8fSGustavo F. Padovan switch (len) { 27060a708f8fSGustavo F. Padovan case 1: 27070a708f8fSGustavo F. Padovan *((u8 *) opt->val) = val; 27080a708f8fSGustavo F. Padovan break; 27090a708f8fSGustavo F. Padovan 27100a708f8fSGustavo F. Padovan case 2: 27110a708f8fSGustavo F. Padovan put_unaligned_le16(val, opt->val); 27120a708f8fSGustavo F. Padovan break; 27130a708f8fSGustavo F. Padovan 27140a708f8fSGustavo F. Padovan case 4: 27150a708f8fSGustavo F. Padovan put_unaligned_le32(val, opt->val); 27160a708f8fSGustavo F. Padovan break; 27170a708f8fSGustavo F. Padovan 27180a708f8fSGustavo F. Padovan default: 27190a708f8fSGustavo F. Padovan memcpy(opt->val, (void *) val, len); 27200a708f8fSGustavo F. Padovan break; 27210a708f8fSGustavo F. Padovan } 27220a708f8fSGustavo F. Padovan 27230a708f8fSGustavo F. Padovan *ptr += L2CAP_CONF_OPT_SIZE + len; 27240a708f8fSGustavo F. Padovan } 27250a708f8fSGustavo F. Padovan 2726f89cef09SAndrei Emeltchenko static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan) 2727f89cef09SAndrei Emeltchenko { 2728f89cef09SAndrei Emeltchenko struct l2cap_conf_efs efs; 2729f89cef09SAndrei Emeltchenko 2730f89cef09SAndrei Emeltchenko switch (chan->mode) { 2731f89cef09SAndrei Emeltchenko case L2CAP_MODE_ERTM: 2732f89cef09SAndrei Emeltchenko efs.id = chan->local_id; 2733f89cef09SAndrei Emeltchenko efs.stype = chan->local_stype; 2734f89cef09SAndrei Emeltchenko efs.msdu = cpu_to_le16(chan->local_msdu); 2735f89cef09SAndrei Emeltchenko efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); 2736ac73498cSAndrei Emeltchenko efs.acc_lat = __constant_cpu_to_le32(L2CAP_DEFAULT_ACC_LAT); 27378936fa6dSAndrei Emeltchenko efs.flush_to = __constant_cpu_to_le32(L2CAP_EFS_DEFAULT_FLUSH_TO); 2738f89cef09SAndrei Emeltchenko break; 2739f89cef09SAndrei Emeltchenko 2740f89cef09SAndrei Emeltchenko case L2CAP_MODE_STREAMING: 2741f89cef09SAndrei Emeltchenko efs.id = 1; 2742f89cef09SAndrei Emeltchenko efs.stype = L2CAP_SERV_BESTEFFORT; 2743f89cef09SAndrei Emeltchenko efs.msdu = cpu_to_le16(chan->local_msdu); 2744f89cef09SAndrei Emeltchenko efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); 2745f89cef09SAndrei Emeltchenko efs.acc_lat = 0; 2746f89cef09SAndrei Emeltchenko efs.flush_to = 0; 2747f89cef09SAndrei Emeltchenko break; 2748f89cef09SAndrei Emeltchenko 2749f89cef09SAndrei Emeltchenko default: 2750f89cef09SAndrei Emeltchenko return; 2751f89cef09SAndrei Emeltchenko } 2752f89cef09SAndrei Emeltchenko 2753f89cef09SAndrei Emeltchenko l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs), 2754f89cef09SAndrei Emeltchenko (unsigned long) &efs); 2755f89cef09SAndrei Emeltchenko } 2756f89cef09SAndrei Emeltchenko 2757721c4181SGustavo F. Padovan static void l2cap_ack_timeout(struct work_struct *work) 27580a708f8fSGustavo F. Padovan { 2759721c4181SGustavo F. Padovan struct l2cap_chan *chan = container_of(work, struct l2cap_chan, 2760721c4181SGustavo F. Padovan ack_timer.work); 27610362520bSMat Martineau u16 frames_to_ack; 27620a708f8fSGustavo F. Padovan 27632fb9b3d4SGustavo F. Padovan BT_DBG("chan %p", chan); 27642fb9b3d4SGustavo F. Padovan 27656be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 27666be36555SAndrei Emeltchenko 27670362520bSMat Martineau frames_to_ack = __seq_offset(chan, chan->buffer_seq, 27680362520bSMat Martineau chan->last_acked_seq); 27690362520bSMat Martineau 27700362520bSMat Martineau if (frames_to_ack) 27710362520bSMat Martineau l2cap_send_rr_or_rnr(chan, 0); 27726be36555SAndrei Emeltchenko 27736be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 277409bfb2eeSSzymon Janc l2cap_chan_put(chan); 27750a708f8fSGustavo F. Padovan } 27760a708f8fSGustavo F. Padovan 2777466f8004SAndrei Emeltchenko int l2cap_ertm_init(struct l2cap_chan *chan) 27780a708f8fSGustavo F. Padovan { 27793c588192SMat Martineau int err; 27803c588192SMat Martineau 2781105bdf9eSMat Martineau chan->next_tx_seq = 0; 2782105bdf9eSMat Martineau chan->expected_tx_seq = 0; 278342e5c802SGustavo F. Padovan chan->expected_ack_seq = 0; 27846a026610SGustavo F. Padovan chan->unacked_frames = 0; 278542e5c802SGustavo F. Padovan chan->buffer_seq = 0; 27866a026610SGustavo F. Padovan chan->frames_sent = 0; 2787105bdf9eSMat Martineau chan->last_acked_seq = 0; 2788105bdf9eSMat Martineau chan->sdu = NULL; 2789105bdf9eSMat Martineau chan->sdu_last_frag = NULL; 2790105bdf9eSMat Martineau chan->sdu_len = 0; 2791105bdf9eSMat Martineau 2792d34c34fbSMat Martineau skb_queue_head_init(&chan->tx_q); 2793d34c34fbSMat Martineau 2794105bdf9eSMat Martineau if (chan->mode != L2CAP_MODE_ERTM) 2795105bdf9eSMat Martineau return 0; 2796105bdf9eSMat Martineau 2797105bdf9eSMat Martineau chan->rx_state = L2CAP_RX_STATE_RECV; 2798105bdf9eSMat Martineau chan->tx_state = L2CAP_TX_STATE_XMIT; 27990a708f8fSGustavo F. Padovan 2800721c4181SGustavo F. Padovan INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout); 2801721c4181SGustavo F. Padovan INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout); 2802721c4181SGustavo F. Padovan INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout); 28030a708f8fSGustavo F. Padovan 2804f1c6775bSGustavo F. Padovan skb_queue_head_init(&chan->srej_q); 28050a708f8fSGustavo F. Padovan 28063c588192SMat Martineau err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win); 28073c588192SMat Martineau if (err < 0) 28083c588192SMat Martineau return err; 28093c588192SMat Martineau 28109dc9affcSMat Martineau err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win); 28119dc9affcSMat Martineau if (err < 0) 28129dc9affcSMat Martineau l2cap_seq_list_free(&chan->srej_list); 28139dc9affcSMat Martineau 28149dc9affcSMat Martineau return err; 28150a708f8fSGustavo F. Padovan } 28160a708f8fSGustavo F. Padovan 28170a708f8fSGustavo F. Padovan static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) 28180a708f8fSGustavo F. Padovan { 28190a708f8fSGustavo F. Padovan switch (mode) { 28200a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 28210a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 28220a708f8fSGustavo F. Padovan if (l2cap_mode_supported(mode, remote_feat_mask)) 28230a708f8fSGustavo F. Padovan return mode; 28240a708f8fSGustavo F. Padovan /* fall through */ 28250a708f8fSGustavo F. Padovan default: 28260a708f8fSGustavo F. Padovan return L2CAP_MODE_BASIC; 28270a708f8fSGustavo F. Padovan } 28280a708f8fSGustavo F. Padovan } 28290a708f8fSGustavo F. Padovan 28306327eb98SAndrei Emeltchenko static inline bool __l2cap_ews_supported(struct l2cap_chan *chan) 28316327eb98SAndrei Emeltchenko { 28326327eb98SAndrei Emeltchenko return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_WINDOW; 28336327eb98SAndrei Emeltchenko } 28346327eb98SAndrei Emeltchenko 2835f89cef09SAndrei Emeltchenko static inline bool __l2cap_efs_supported(struct l2cap_chan *chan) 2836f89cef09SAndrei Emeltchenko { 2837f89cef09SAndrei Emeltchenko return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_FLOW; 2838f89cef09SAndrei Emeltchenko } 2839f89cef09SAndrei Emeltchenko 28406327eb98SAndrei Emeltchenko static inline void l2cap_txwin_setup(struct l2cap_chan *chan) 28416327eb98SAndrei Emeltchenko { 28426327eb98SAndrei Emeltchenko if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW && 2843836be934SAndrei Emeltchenko __l2cap_ews_supported(chan)) { 28446327eb98SAndrei Emeltchenko /* use extended control field */ 28456327eb98SAndrei Emeltchenko set_bit(FLAG_EXT_CTRL, &chan->flags); 2846836be934SAndrei Emeltchenko chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; 2847836be934SAndrei Emeltchenko } else { 28486327eb98SAndrei Emeltchenko chan->tx_win = min_t(u16, chan->tx_win, 28496327eb98SAndrei Emeltchenko L2CAP_DEFAULT_TX_WINDOW); 2850836be934SAndrei Emeltchenko chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; 2851836be934SAndrei Emeltchenko } 2852c20f8e35SMat Martineau chan->ack_win = chan->tx_win; 28536327eb98SAndrei Emeltchenko } 28546327eb98SAndrei Emeltchenko 2855710f9b0aSGustavo F. Padovan static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data) 28560a708f8fSGustavo F. Padovan { 28570a708f8fSGustavo F. Padovan struct l2cap_conf_req *req = data; 28580c1bc5c6SGustavo F. Padovan struct l2cap_conf_rfc rfc = { .mode = chan->mode }; 28590a708f8fSGustavo F. Padovan void *ptr = req->data; 2860c8f79162SAndrei Emeltchenko u16 size; 28610a708f8fSGustavo F. Padovan 286249208c9cSGustavo F. Padovan BT_DBG("chan %p", chan); 28630a708f8fSGustavo F. Padovan 286473ffa904SGustavo F. Padovan if (chan->num_conf_req || chan->num_conf_rsp) 28650a708f8fSGustavo F. Padovan goto done; 28660a708f8fSGustavo F. Padovan 28670c1bc5c6SGustavo F. Padovan switch (chan->mode) { 28680a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 28690a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 2870c1360a1cSGustavo F. Padovan if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) 28710a708f8fSGustavo F. Padovan break; 28720a708f8fSGustavo F. Padovan 2873f89cef09SAndrei Emeltchenko if (__l2cap_efs_supported(chan)) 2874f89cef09SAndrei Emeltchenko set_bit(FLAG_EFS_ENABLE, &chan->flags); 2875f89cef09SAndrei Emeltchenko 28760a708f8fSGustavo F. Padovan /* fall through */ 28770a708f8fSGustavo F. Padovan default: 28788c1d787bSGustavo F. Padovan chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask); 28790a708f8fSGustavo F. Padovan break; 28800a708f8fSGustavo F. Padovan } 28810a708f8fSGustavo F. Padovan 28820a708f8fSGustavo F. Padovan done: 28830c1bc5c6SGustavo F. Padovan if (chan->imtu != L2CAP_DEFAULT_MTU) 28840c1bc5c6SGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); 28850a708f8fSGustavo F. Padovan 28860c1bc5c6SGustavo F. Padovan switch (chan->mode) { 28870a708f8fSGustavo F. Padovan case L2CAP_MODE_BASIC: 28888c1d787bSGustavo F. Padovan if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) && 28898c1d787bSGustavo F. Padovan !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING)) 28900a708f8fSGustavo F. Padovan break; 28910a708f8fSGustavo F. Padovan 28920a708f8fSGustavo F. Padovan rfc.mode = L2CAP_MODE_BASIC; 28930a708f8fSGustavo F. Padovan rfc.txwin_size = 0; 28940a708f8fSGustavo F. Padovan rfc.max_transmit = 0; 28950a708f8fSGustavo F. Padovan rfc.retrans_timeout = 0; 28960a708f8fSGustavo F. Padovan rfc.monitor_timeout = 0; 28970a708f8fSGustavo F. Padovan rfc.max_pdu_size = 0; 28980a708f8fSGustavo F. Padovan 28990a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), 29000a708f8fSGustavo F. Padovan (unsigned long) &rfc); 29010a708f8fSGustavo F. Padovan break; 29020a708f8fSGustavo F. Padovan 29030a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 29040a708f8fSGustavo F. Padovan rfc.mode = L2CAP_MODE_ERTM; 290547d1ec61SGustavo F. Padovan rfc.max_transmit = chan->max_tx; 29060a708f8fSGustavo F. Padovan rfc.retrans_timeout = 0; 29070a708f8fSGustavo F. Padovan rfc.monitor_timeout = 0; 2908c8f79162SAndrei Emeltchenko 2909c8f79162SAndrei Emeltchenko size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - 29102d792818SGustavo Padovan L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE - 2911c8f79162SAndrei Emeltchenko L2CAP_FCS_SIZE); 2912c8f79162SAndrei Emeltchenko rfc.max_pdu_size = cpu_to_le16(size); 29130a708f8fSGustavo F. Padovan 29146327eb98SAndrei Emeltchenko l2cap_txwin_setup(chan); 29156327eb98SAndrei Emeltchenko 29166327eb98SAndrei Emeltchenko rfc.txwin_size = min_t(u16, chan->tx_win, 29176327eb98SAndrei Emeltchenko L2CAP_DEFAULT_TX_WINDOW); 29180a708f8fSGustavo F. Padovan 29190a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), 29200a708f8fSGustavo F. Padovan (unsigned long) &rfc); 29210a708f8fSGustavo F. Padovan 2922f89cef09SAndrei Emeltchenko if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) 2923f89cef09SAndrei Emeltchenko l2cap_add_opt_efs(&ptr, chan); 2924f89cef09SAndrei Emeltchenko 29258c1d787bSGustavo F. Padovan if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) 29260a708f8fSGustavo F. Padovan break; 29270a708f8fSGustavo F. Padovan 292847d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_NONE || 2929c1360a1cSGustavo F. Padovan test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { 293047d1ec61SGustavo F. Padovan chan->fcs = L2CAP_FCS_NONE; 293147d1ec61SGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); 29320a708f8fSGustavo F. Padovan } 29336327eb98SAndrei Emeltchenko 29346327eb98SAndrei Emeltchenko if (test_bit(FLAG_EXT_CTRL, &chan->flags)) 29356327eb98SAndrei Emeltchenko l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, 29366327eb98SAndrei Emeltchenko chan->tx_win); 29370a708f8fSGustavo F. Padovan break; 29380a708f8fSGustavo F. Padovan 29390a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 2940273759e2SMat Martineau l2cap_txwin_setup(chan); 29410a708f8fSGustavo F. Padovan rfc.mode = L2CAP_MODE_STREAMING; 29420a708f8fSGustavo F. Padovan rfc.txwin_size = 0; 29430a708f8fSGustavo F. Padovan rfc.max_transmit = 0; 29440a708f8fSGustavo F. Padovan rfc.retrans_timeout = 0; 29450a708f8fSGustavo F. Padovan rfc.monitor_timeout = 0; 2946c8f79162SAndrei Emeltchenko 2947c8f79162SAndrei Emeltchenko size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - 29482d792818SGustavo Padovan L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE - 2949c8f79162SAndrei Emeltchenko L2CAP_FCS_SIZE); 2950c8f79162SAndrei Emeltchenko rfc.max_pdu_size = cpu_to_le16(size); 29510a708f8fSGustavo F. Padovan 29520a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), 29530a708f8fSGustavo F. Padovan (unsigned long) &rfc); 29540a708f8fSGustavo F. Padovan 2955f89cef09SAndrei Emeltchenko if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) 2956f89cef09SAndrei Emeltchenko l2cap_add_opt_efs(&ptr, chan); 2957f89cef09SAndrei Emeltchenko 29588c1d787bSGustavo F. Padovan if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) 29590a708f8fSGustavo F. Padovan break; 29600a708f8fSGustavo F. Padovan 296147d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_NONE || 2962c1360a1cSGustavo F. Padovan test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { 296347d1ec61SGustavo F. Padovan chan->fcs = L2CAP_FCS_NONE; 296447d1ec61SGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); 29650a708f8fSGustavo F. Padovan } 29660a708f8fSGustavo F. Padovan break; 29670a708f8fSGustavo F. Padovan } 29680a708f8fSGustavo F. Padovan 2969fe4128e0SGustavo F. Padovan req->dcid = cpu_to_le16(chan->dcid); 297059e54bd1SAndrei Emeltchenko req->flags = __constant_cpu_to_le16(0); 29710a708f8fSGustavo F. Padovan 29720a708f8fSGustavo F. Padovan return ptr - data; 29730a708f8fSGustavo F. Padovan } 29740a708f8fSGustavo F. Padovan 297573ffa904SGustavo F. Padovan static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data) 29760a708f8fSGustavo F. Padovan { 29770a708f8fSGustavo F. Padovan struct l2cap_conf_rsp *rsp = data; 29780a708f8fSGustavo F. Padovan void *ptr = rsp->data; 297973ffa904SGustavo F. Padovan void *req = chan->conf_req; 298073ffa904SGustavo F. Padovan int len = chan->conf_len; 29810a708f8fSGustavo F. Padovan int type, hint, olen; 29820a708f8fSGustavo F. Padovan unsigned long val; 29830a708f8fSGustavo F. Padovan struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; 298442dceae2SAndrei Emeltchenko struct l2cap_conf_efs efs; 298542dceae2SAndrei Emeltchenko u8 remote_efs = 0; 29860a708f8fSGustavo F. Padovan u16 mtu = L2CAP_DEFAULT_MTU; 29870a708f8fSGustavo F. Padovan u16 result = L2CAP_CONF_SUCCESS; 2988c8f79162SAndrei Emeltchenko u16 size; 29890a708f8fSGustavo F. Padovan 299073ffa904SGustavo F. Padovan BT_DBG("chan %p", chan); 29910a708f8fSGustavo F. Padovan 29920a708f8fSGustavo F. Padovan while (len >= L2CAP_CONF_OPT_SIZE) { 29930a708f8fSGustavo F. Padovan len -= l2cap_get_conf_opt(&req, &type, &olen, &val); 29940a708f8fSGustavo F. Padovan 29950a708f8fSGustavo F. Padovan hint = type & L2CAP_CONF_HINT; 29960a708f8fSGustavo F. Padovan type &= L2CAP_CONF_MASK; 29970a708f8fSGustavo F. Padovan 29980a708f8fSGustavo F. Padovan switch (type) { 29990a708f8fSGustavo F. Padovan case L2CAP_CONF_MTU: 30000a708f8fSGustavo F. Padovan mtu = val; 30010a708f8fSGustavo F. Padovan break; 30020a708f8fSGustavo F. Padovan 30030a708f8fSGustavo F. Padovan case L2CAP_CONF_FLUSH_TO: 30040c1bc5c6SGustavo F. Padovan chan->flush_to = val; 30050a708f8fSGustavo F. Padovan break; 30060a708f8fSGustavo F. Padovan 30070a708f8fSGustavo F. Padovan case L2CAP_CONF_QOS: 30080a708f8fSGustavo F. Padovan break; 30090a708f8fSGustavo F. Padovan 30100a708f8fSGustavo F. Padovan case L2CAP_CONF_RFC: 30110a708f8fSGustavo F. Padovan if (olen == sizeof(rfc)) 30120a708f8fSGustavo F. Padovan memcpy(&rfc, (void *) val, olen); 30130a708f8fSGustavo F. Padovan break; 30140a708f8fSGustavo F. Padovan 30150a708f8fSGustavo F. Padovan case L2CAP_CONF_FCS: 30160a708f8fSGustavo F. Padovan if (val == L2CAP_FCS_NONE) 3017c1360a1cSGustavo F. Padovan set_bit(CONF_NO_FCS_RECV, &chan->conf_state); 301842dceae2SAndrei Emeltchenko break; 30190a708f8fSGustavo F. Padovan 302042dceae2SAndrei Emeltchenko case L2CAP_CONF_EFS: 302142dceae2SAndrei Emeltchenko remote_efs = 1; 302242dceae2SAndrei Emeltchenko if (olen == sizeof(efs)) 302342dceae2SAndrei Emeltchenko memcpy(&efs, (void *) val, olen); 30240a708f8fSGustavo F. Padovan break; 30250a708f8fSGustavo F. Padovan 30266327eb98SAndrei Emeltchenko case L2CAP_CONF_EWS: 30276327eb98SAndrei Emeltchenko if (!enable_hs) 30286327eb98SAndrei Emeltchenko return -ECONNREFUSED; 30296327eb98SAndrei Emeltchenko 30306327eb98SAndrei Emeltchenko set_bit(FLAG_EXT_CTRL, &chan->flags); 30316327eb98SAndrei Emeltchenko set_bit(CONF_EWS_RECV, &chan->conf_state); 3032836be934SAndrei Emeltchenko chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; 30336327eb98SAndrei Emeltchenko chan->remote_tx_win = val; 30340a708f8fSGustavo F. Padovan break; 30350a708f8fSGustavo F. Padovan 30360a708f8fSGustavo F. Padovan default: 30370a708f8fSGustavo F. Padovan if (hint) 30380a708f8fSGustavo F. Padovan break; 30390a708f8fSGustavo F. Padovan 30400a708f8fSGustavo F. Padovan result = L2CAP_CONF_UNKNOWN; 30410a708f8fSGustavo F. Padovan *((u8 *) ptr++) = type; 30420a708f8fSGustavo F. Padovan break; 30430a708f8fSGustavo F. Padovan } 30440a708f8fSGustavo F. Padovan } 30450a708f8fSGustavo F. Padovan 304673ffa904SGustavo F. Padovan if (chan->num_conf_rsp || chan->num_conf_req > 1) 30470a708f8fSGustavo F. Padovan goto done; 30480a708f8fSGustavo F. Padovan 30490c1bc5c6SGustavo F. Padovan switch (chan->mode) { 30500a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 30510a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 3052c1360a1cSGustavo F. Padovan if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) { 30530c1bc5c6SGustavo F. Padovan chan->mode = l2cap_select_mode(rfc.mode, 30548c1d787bSGustavo F. Padovan chan->conn->feat_mask); 30550a708f8fSGustavo F. Padovan break; 30560a708f8fSGustavo F. Padovan } 30570a708f8fSGustavo F. Padovan 305842dceae2SAndrei Emeltchenko if (remote_efs) { 305942dceae2SAndrei Emeltchenko if (__l2cap_efs_supported(chan)) 306042dceae2SAndrei Emeltchenko set_bit(FLAG_EFS_ENABLE, &chan->flags); 306142dceae2SAndrei Emeltchenko else 306242dceae2SAndrei Emeltchenko return -ECONNREFUSED; 306342dceae2SAndrei Emeltchenko } 306442dceae2SAndrei Emeltchenko 30650c1bc5c6SGustavo F. Padovan if (chan->mode != rfc.mode) 30660a708f8fSGustavo F. Padovan return -ECONNREFUSED; 30670a708f8fSGustavo F. Padovan 30680a708f8fSGustavo F. Padovan break; 30690a708f8fSGustavo F. Padovan } 30700a708f8fSGustavo F. Padovan 30710a708f8fSGustavo F. Padovan done: 30720c1bc5c6SGustavo F. Padovan if (chan->mode != rfc.mode) { 30730a708f8fSGustavo F. Padovan result = L2CAP_CONF_UNACCEPT; 30740c1bc5c6SGustavo F. Padovan rfc.mode = chan->mode; 30750a708f8fSGustavo F. Padovan 307673ffa904SGustavo F. Padovan if (chan->num_conf_rsp == 1) 30770a708f8fSGustavo F. Padovan return -ECONNREFUSED; 30780a708f8fSGustavo F. Padovan 30792d792818SGustavo Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), 30802d792818SGustavo Padovan (unsigned long) &rfc); 30810a708f8fSGustavo F. Padovan } 30820a708f8fSGustavo F. Padovan 30830a708f8fSGustavo F. Padovan if (result == L2CAP_CONF_SUCCESS) { 30840a708f8fSGustavo F. Padovan /* Configure output options and let the other side know 30850a708f8fSGustavo F. Padovan * which ones we don't like. */ 30860a708f8fSGustavo F. Padovan 30870a708f8fSGustavo F. Padovan if (mtu < L2CAP_DEFAULT_MIN_MTU) 30880a708f8fSGustavo F. Padovan result = L2CAP_CONF_UNACCEPT; 30890a708f8fSGustavo F. Padovan else { 30900c1bc5c6SGustavo F. Padovan chan->omtu = mtu; 3091c1360a1cSGustavo F. Padovan set_bit(CONF_MTU_DONE, &chan->conf_state); 30920a708f8fSGustavo F. Padovan } 30930c1bc5c6SGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu); 30940a708f8fSGustavo F. Padovan 309542dceae2SAndrei Emeltchenko if (remote_efs) { 309642dceae2SAndrei Emeltchenko if (chan->local_stype != L2CAP_SERV_NOTRAFIC && 309742dceae2SAndrei Emeltchenko efs.stype != L2CAP_SERV_NOTRAFIC && 309842dceae2SAndrei Emeltchenko efs.stype != chan->local_stype) { 309942dceae2SAndrei Emeltchenko 310042dceae2SAndrei Emeltchenko result = L2CAP_CONF_UNACCEPT; 310142dceae2SAndrei Emeltchenko 310242dceae2SAndrei Emeltchenko if (chan->num_conf_req >= 1) 310342dceae2SAndrei Emeltchenko return -ECONNREFUSED; 310442dceae2SAndrei Emeltchenko 310542dceae2SAndrei Emeltchenko l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, 310642dceae2SAndrei Emeltchenko sizeof(efs), 310742dceae2SAndrei Emeltchenko (unsigned long) &efs); 31080e8b207eSAndrei Emeltchenko } else { 31093e6b3b95SGustavo F. Padovan /* Send PENDING Conf Rsp */ 31100e8b207eSAndrei Emeltchenko result = L2CAP_CONF_PENDING; 31110e8b207eSAndrei Emeltchenko set_bit(CONF_LOC_CONF_PEND, &chan->conf_state); 311242dceae2SAndrei Emeltchenko } 311342dceae2SAndrei Emeltchenko } 311442dceae2SAndrei Emeltchenko 31150a708f8fSGustavo F. Padovan switch (rfc.mode) { 31160a708f8fSGustavo F. Padovan case L2CAP_MODE_BASIC: 311747d1ec61SGustavo F. Padovan chan->fcs = L2CAP_FCS_NONE; 3118c1360a1cSGustavo F. Padovan set_bit(CONF_MODE_DONE, &chan->conf_state); 31190a708f8fSGustavo F. Padovan break; 31200a708f8fSGustavo F. Padovan 31210a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 31226327eb98SAndrei Emeltchenko if (!test_bit(CONF_EWS_RECV, &chan->conf_state)) 31232c03a7a4SGustavo F. Padovan chan->remote_tx_win = rfc.txwin_size; 31246327eb98SAndrei Emeltchenko else 31256327eb98SAndrei Emeltchenko rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW; 31266327eb98SAndrei Emeltchenko 31272c03a7a4SGustavo F. Padovan chan->remote_max_tx = rfc.max_transmit; 31280a708f8fSGustavo F. Padovan 3129c8f79162SAndrei Emeltchenko size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), 31302d792818SGustavo Padovan chan->conn->mtu - L2CAP_EXT_HDR_SIZE - 31312d792818SGustavo Padovan L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE); 3132c8f79162SAndrei Emeltchenko rfc.max_pdu_size = cpu_to_le16(size); 3133c8f79162SAndrei Emeltchenko chan->remote_mps = size; 31340a708f8fSGustavo F. Padovan 31350a708f8fSGustavo F. Padovan rfc.retrans_timeout = 31364fd21a88SAndrei Emeltchenko __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO); 31370a708f8fSGustavo F. Padovan rfc.monitor_timeout = 31384fd21a88SAndrei Emeltchenko __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO); 31390a708f8fSGustavo F. Padovan 3140c1360a1cSGustavo F. Padovan set_bit(CONF_MODE_DONE, &chan->conf_state); 31410a708f8fSGustavo F. Padovan 31420a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, 31430a708f8fSGustavo F. Padovan sizeof(rfc), (unsigned long) &rfc); 31440a708f8fSGustavo F. Padovan 314542dceae2SAndrei Emeltchenko if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { 314642dceae2SAndrei Emeltchenko chan->remote_id = efs.id; 314742dceae2SAndrei Emeltchenko chan->remote_stype = efs.stype; 314842dceae2SAndrei Emeltchenko chan->remote_msdu = le16_to_cpu(efs.msdu); 314942dceae2SAndrei Emeltchenko chan->remote_flush_to = 315042dceae2SAndrei Emeltchenko le32_to_cpu(efs.flush_to); 315142dceae2SAndrei Emeltchenko chan->remote_acc_lat = 315242dceae2SAndrei Emeltchenko le32_to_cpu(efs.acc_lat); 315342dceae2SAndrei Emeltchenko chan->remote_sdu_itime = 315442dceae2SAndrei Emeltchenko le32_to_cpu(efs.sdu_itime); 315542dceae2SAndrei Emeltchenko l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, 31562d792818SGustavo Padovan sizeof(efs), 31572d792818SGustavo Padovan (unsigned long) &efs); 315842dceae2SAndrei Emeltchenko } 31590a708f8fSGustavo F. Padovan break; 31600a708f8fSGustavo F. Padovan 31610a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 3162c8f79162SAndrei Emeltchenko size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), 31632d792818SGustavo Padovan chan->conn->mtu - L2CAP_EXT_HDR_SIZE - 31642d792818SGustavo Padovan L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE); 3165c8f79162SAndrei Emeltchenko rfc.max_pdu_size = cpu_to_le16(size); 3166c8f79162SAndrei Emeltchenko chan->remote_mps = size; 31670a708f8fSGustavo F. Padovan 3168c1360a1cSGustavo F. Padovan set_bit(CONF_MODE_DONE, &chan->conf_state); 31690a708f8fSGustavo F. Padovan 31702d792818SGustavo Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), 31712d792818SGustavo Padovan (unsigned long) &rfc); 31720a708f8fSGustavo F. Padovan 31730a708f8fSGustavo F. Padovan break; 31740a708f8fSGustavo F. Padovan 31750a708f8fSGustavo F. Padovan default: 31760a708f8fSGustavo F. Padovan result = L2CAP_CONF_UNACCEPT; 31770a708f8fSGustavo F. Padovan 31780a708f8fSGustavo F. Padovan memset(&rfc, 0, sizeof(rfc)); 31790c1bc5c6SGustavo F. Padovan rfc.mode = chan->mode; 31800a708f8fSGustavo F. Padovan } 31810a708f8fSGustavo F. Padovan 31820a708f8fSGustavo F. Padovan if (result == L2CAP_CONF_SUCCESS) 3183c1360a1cSGustavo F. Padovan set_bit(CONF_OUTPUT_DONE, &chan->conf_state); 31840a708f8fSGustavo F. Padovan } 3185fe4128e0SGustavo F. Padovan rsp->scid = cpu_to_le16(chan->dcid); 31860a708f8fSGustavo F. Padovan rsp->result = cpu_to_le16(result); 318759e54bd1SAndrei Emeltchenko rsp->flags = __constant_cpu_to_le16(0); 31880a708f8fSGustavo F. Padovan 31890a708f8fSGustavo F. Padovan return ptr - data; 31900a708f8fSGustavo F. Padovan } 31910a708f8fSGustavo F. Padovan 31922d792818SGustavo Padovan static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, 31932d792818SGustavo Padovan void *data, u16 *result) 31940a708f8fSGustavo F. Padovan { 31950a708f8fSGustavo F. Padovan struct l2cap_conf_req *req = data; 31960a708f8fSGustavo F. Padovan void *ptr = req->data; 31970a708f8fSGustavo F. Padovan int type, olen; 31980a708f8fSGustavo F. Padovan unsigned long val; 319936e999a8SMat Martineau struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; 320066af7aafSAndrei Emeltchenko struct l2cap_conf_efs efs; 32010a708f8fSGustavo F. Padovan 3202fe4128e0SGustavo F. Padovan BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data); 32030a708f8fSGustavo F. Padovan 32040a708f8fSGustavo F. Padovan while (len >= L2CAP_CONF_OPT_SIZE) { 32050a708f8fSGustavo F. Padovan len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); 32060a708f8fSGustavo F. Padovan 32070a708f8fSGustavo F. Padovan switch (type) { 32080a708f8fSGustavo F. Padovan case L2CAP_CONF_MTU: 32090a708f8fSGustavo F. Padovan if (val < L2CAP_DEFAULT_MIN_MTU) { 32100a708f8fSGustavo F. Padovan *result = L2CAP_CONF_UNACCEPT; 32110c1bc5c6SGustavo F. Padovan chan->imtu = L2CAP_DEFAULT_MIN_MTU; 32120a708f8fSGustavo F. Padovan } else 32130c1bc5c6SGustavo F. Padovan chan->imtu = val; 32140c1bc5c6SGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); 32150a708f8fSGustavo F. Padovan break; 32160a708f8fSGustavo F. Padovan 32170a708f8fSGustavo F. Padovan case L2CAP_CONF_FLUSH_TO: 32180c1bc5c6SGustavo F. Padovan chan->flush_to = val; 32190a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, 32200c1bc5c6SGustavo F. Padovan 2, chan->flush_to); 32210a708f8fSGustavo F. Padovan break; 32220a708f8fSGustavo F. Padovan 32230a708f8fSGustavo F. Padovan case L2CAP_CONF_RFC: 32240a708f8fSGustavo F. Padovan if (olen == sizeof(rfc)) 32250a708f8fSGustavo F. Padovan memcpy(&rfc, (void *)val, olen); 32260a708f8fSGustavo F. Padovan 3227c1360a1cSGustavo F. Padovan if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) && 32280c1bc5c6SGustavo F. Padovan rfc.mode != chan->mode) 32290a708f8fSGustavo F. Padovan return -ECONNREFUSED; 32300a708f8fSGustavo F. Padovan 323147d1ec61SGustavo F. Padovan chan->fcs = 0; 32320a708f8fSGustavo F. Padovan 32330a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, 32340a708f8fSGustavo F. Padovan sizeof(rfc), (unsigned long) &rfc); 32350a708f8fSGustavo F. Padovan break; 32366327eb98SAndrei Emeltchenko 32376327eb98SAndrei Emeltchenko case L2CAP_CONF_EWS: 3238c20f8e35SMat Martineau chan->ack_win = min_t(u16, val, chan->ack_win); 32393e6b3b95SGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, 32403e6b3b95SGustavo F. Padovan chan->tx_win); 32416327eb98SAndrei Emeltchenko break; 324266af7aafSAndrei Emeltchenko 324366af7aafSAndrei Emeltchenko case L2CAP_CONF_EFS: 324466af7aafSAndrei Emeltchenko if (olen == sizeof(efs)) 324566af7aafSAndrei Emeltchenko memcpy(&efs, (void *)val, olen); 324666af7aafSAndrei Emeltchenko 324766af7aafSAndrei Emeltchenko if (chan->local_stype != L2CAP_SERV_NOTRAFIC && 324866af7aafSAndrei Emeltchenko efs.stype != L2CAP_SERV_NOTRAFIC && 324966af7aafSAndrei Emeltchenko efs.stype != chan->local_stype) 325066af7aafSAndrei Emeltchenko return -ECONNREFUSED; 325166af7aafSAndrei Emeltchenko 32522d792818SGustavo Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, sizeof(efs), 32532d792818SGustavo Padovan (unsigned long) &efs); 325466af7aafSAndrei Emeltchenko break; 32550a708f8fSGustavo F. Padovan } 32560a708f8fSGustavo F. Padovan } 32570a708f8fSGustavo F. Padovan 32580c1bc5c6SGustavo F. Padovan if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode) 32590a708f8fSGustavo F. Padovan return -ECONNREFUSED; 32600a708f8fSGustavo F. Padovan 32610c1bc5c6SGustavo F. Padovan chan->mode = rfc.mode; 32620a708f8fSGustavo F. Padovan 32630e8b207eSAndrei Emeltchenko if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) { 32640a708f8fSGustavo F. Padovan switch (rfc.mode) { 32650a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 326647d1ec61SGustavo F. Padovan chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); 326747d1ec61SGustavo F. Padovan chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); 326847d1ec61SGustavo F. Padovan chan->mps = le16_to_cpu(rfc.max_pdu_size); 3269c20f8e35SMat Martineau if (!test_bit(FLAG_EXT_CTRL, &chan->flags)) 3270c20f8e35SMat Martineau chan->ack_win = min_t(u16, chan->ack_win, 3271c20f8e35SMat Martineau rfc.txwin_size); 327266af7aafSAndrei Emeltchenko 327366af7aafSAndrei Emeltchenko if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { 327466af7aafSAndrei Emeltchenko chan->local_msdu = le16_to_cpu(efs.msdu); 327566af7aafSAndrei Emeltchenko chan->local_sdu_itime = 327666af7aafSAndrei Emeltchenko le32_to_cpu(efs.sdu_itime); 327766af7aafSAndrei Emeltchenko chan->local_acc_lat = le32_to_cpu(efs.acc_lat); 327866af7aafSAndrei Emeltchenko chan->local_flush_to = 327966af7aafSAndrei Emeltchenko le32_to_cpu(efs.flush_to); 328066af7aafSAndrei Emeltchenko } 32810a708f8fSGustavo F. Padovan break; 328266af7aafSAndrei Emeltchenko 32830a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 328447d1ec61SGustavo F. Padovan chan->mps = le16_to_cpu(rfc.max_pdu_size); 32850a708f8fSGustavo F. Padovan } 32860a708f8fSGustavo F. Padovan } 32870a708f8fSGustavo F. Padovan 3288fe4128e0SGustavo F. Padovan req->dcid = cpu_to_le16(chan->dcid); 328959e54bd1SAndrei Emeltchenko req->flags = __constant_cpu_to_le16(0); 32900a708f8fSGustavo F. Padovan 32910a708f8fSGustavo F. Padovan return ptr - data; 32920a708f8fSGustavo F. Padovan } 32930a708f8fSGustavo F. Padovan 32942d792818SGustavo Padovan static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, 32952d792818SGustavo Padovan u16 result, u16 flags) 32960a708f8fSGustavo F. Padovan { 32970a708f8fSGustavo F. Padovan struct l2cap_conf_rsp *rsp = data; 32980a708f8fSGustavo F. Padovan void *ptr = rsp->data; 32990a708f8fSGustavo F. Padovan 3300fe4128e0SGustavo F. Padovan BT_DBG("chan %p", chan); 33010a708f8fSGustavo F. Padovan 3302fe4128e0SGustavo F. Padovan rsp->scid = cpu_to_le16(chan->dcid); 33030a708f8fSGustavo F. Padovan rsp->result = cpu_to_le16(result); 33040a708f8fSGustavo F. Padovan rsp->flags = cpu_to_le16(flags); 33050a708f8fSGustavo F. Padovan 33060a708f8fSGustavo F. Padovan return ptr - data; 33070a708f8fSGustavo F. Padovan } 33080a708f8fSGustavo F. Padovan 33098c1d787bSGustavo F. Padovan void __l2cap_connect_rsp_defer(struct l2cap_chan *chan) 3310710f9b0aSGustavo F. Padovan { 3311710f9b0aSGustavo F. Padovan struct l2cap_conn_rsp rsp; 33128c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 3313710f9b0aSGustavo F. Padovan u8 buf[128]; 3314710f9b0aSGustavo F. Padovan 3315fe4128e0SGustavo F. Padovan rsp.scid = cpu_to_le16(chan->dcid); 3316fe4128e0SGustavo F. Padovan rsp.dcid = cpu_to_le16(chan->scid); 3317ac73498cSAndrei Emeltchenko rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS); 3318ac73498cSAndrei Emeltchenko rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); 33192d792818SGustavo Padovan l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); 3320710f9b0aSGustavo F. Padovan 3321c1360a1cSGustavo F. Padovan if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) 3322710f9b0aSGustavo F. Padovan return; 3323710f9b0aSGustavo F. Padovan 3324710f9b0aSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 3325710f9b0aSGustavo F. Padovan l2cap_build_conf_req(chan, buf), buf); 3326710f9b0aSGustavo F. Padovan chan->num_conf_req++; 3327710f9b0aSGustavo F. Padovan } 3328710f9b0aSGustavo F. Padovan 332947d1ec61SGustavo F. Padovan static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len) 33300a708f8fSGustavo F. Padovan { 33310a708f8fSGustavo F. Padovan int type, olen; 33320a708f8fSGustavo F. Padovan unsigned long val; 3333c20f8e35SMat Martineau /* Use sane default values in case a misbehaving remote device 3334c20f8e35SMat Martineau * did not send an RFC or extended window size option. 3335c20f8e35SMat Martineau */ 3336c20f8e35SMat Martineau u16 txwin_ext = chan->ack_win; 3337c20f8e35SMat Martineau struct l2cap_conf_rfc rfc = { 3338c20f8e35SMat Martineau .mode = chan->mode, 3339c20f8e35SMat Martineau .retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO), 3340c20f8e35SMat Martineau .monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO), 3341c20f8e35SMat Martineau .max_pdu_size = cpu_to_le16(chan->imtu), 3342c20f8e35SMat Martineau .txwin_size = min_t(u16, chan->ack_win, L2CAP_DEFAULT_TX_WINDOW), 3343c20f8e35SMat Martineau }; 33440a708f8fSGustavo F. Padovan 334547d1ec61SGustavo F. Padovan BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len); 33460a708f8fSGustavo F. Padovan 33470c1bc5c6SGustavo F. Padovan if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING)) 33480a708f8fSGustavo F. Padovan return; 33490a708f8fSGustavo F. Padovan 33500a708f8fSGustavo F. Padovan while (len >= L2CAP_CONF_OPT_SIZE) { 33510a708f8fSGustavo F. Padovan len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); 33520a708f8fSGustavo F. Padovan 3353c20f8e35SMat Martineau switch (type) { 3354c20f8e35SMat Martineau case L2CAP_CONF_RFC: 3355c20f8e35SMat Martineau if (olen == sizeof(rfc)) 33560a708f8fSGustavo F. Padovan memcpy(&rfc, (void *)val, olen); 3357c20f8e35SMat Martineau break; 3358c20f8e35SMat Martineau case L2CAP_CONF_EWS: 3359c20f8e35SMat Martineau txwin_ext = val; 3360c20f8e35SMat Martineau break; 3361c20f8e35SMat Martineau } 33620a708f8fSGustavo F. Padovan } 33630a708f8fSGustavo F. Padovan 33640a708f8fSGustavo F. Padovan switch (rfc.mode) { 33650a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 336647d1ec61SGustavo F. Padovan chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); 336747d1ec61SGustavo F. Padovan chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); 336847d1ec61SGustavo F. Padovan chan->mps = le16_to_cpu(rfc.max_pdu_size); 3369c20f8e35SMat Martineau if (test_bit(FLAG_EXT_CTRL, &chan->flags)) 3370c20f8e35SMat Martineau chan->ack_win = min_t(u16, chan->ack_win, txwin_ext); 3371c20f8e35SMat Martineau else 3372c20f8e35SMat Martineau chan->ack_win = min_t(u16, chan->ack_win, 3373c20f8e35SMat Martineau rfc.txwin_size); 33740a708f8fSGustavo F. Padovan break; 33750a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 337647d1ec61SGustavo F. Padovan chan->mps = le16_to_cpu(rfc.max_pdu_size); 33770a708f8fSGustavo F. Padovan } 33780a708f8fSGustavo F. Padovan } 33790a708f8fSGustavo F. Padovan 33802d792818SGustavo Padovan static inline int l2cap_command_rej(struct l2cap_conn *conn, 33812d792818SGustavo Padovan struct l2cap_cmd_hdr *cmd, u8 *data) 33820a708f8fSGustavo F. Padovan { 3383e2fd318eSIlia Kolomisnky struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data; 33840a708f8fSGustavo F. Padovan 3385e2fd318eSIlia Kolomisnky if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD) 33860a708f8fSGustavo F. Padovan return 0; 33870a708f8fSGustavo F. Padovan 33880a708f8fSGustavo F. Padovan if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && 33890a708f8fSGustavo F. Padovan cmd->ident == conn->info_ident) { 339017cd3f37SUlisses Furquim cancel_delayed_work(&conn->info_timer); 33910a708f8fSGustavo F. Padovan 33920a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 33930a708f8fSGustavo F. Padovan conn->info_ident = 0; 33940a708f8fSGustavo F. Padovan 33950a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 33960a708f8fSGustavo F. Padovan } 33970a708f8fSGustavo F. Padovan 33980a708f8fSGustavo F. Padovan return 0; 33990a708f8fSGustavo F. Padovan } 34000a708f8fSGustavo F. Padovan 34014c89b6aaSMat Martineau static void __l2cap_connect(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, 34024c89b6aaSMat Martineau u8 *data, u8 rsp_code, u8 amp_id) 34030a708f8fSGustavo F. Padovan { 34040a708f8fSGustavo F. Padovan struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; 34050a708f8fSGustavo F. Padovan struct l2cap_conn_rsp rsp; 340623691d75SGustavo F. Padovan struct l2cap_chan *chan = NULL, *pchan; 34070a708f8fSGustavo F. Padovan struct sock *parent, *sk = NULL; 34080a708f8fSGustavo F. Padovan int result, status = L2CAP_CS_NO_INFO; 34090a708f8fSGustavo F. Padovan 34100a708f8fSGustavo F. Padovan u16 dcid = 0, scid = __le16_to_cpu(req->scid); 34110a708f8fSGustavo F. Padovan __le16 psm = req->psm; 34120a708f8fSGustavo F. Padovan 3413097db76cSAndrei Emeltchenko BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid); 34140a708f8fSGustavo F. Padovan 34150a708f8fSGustavo F. Padovan /* Check if we have socket listening on psm */ 3416c2287681SIdo Yariv pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src, conn->dst); 341723691d75SGustavo F. Padovan if (!pchan) { 34180a708f8fSGustavo F. Padovan result = L2CAP_CR_BAD_PSM; 34190a708f8fSGustavo F. Padovan goto sendresp; 34200a708f8fSGustavo F. Padovan } 34210a708f8fSGustavo F. Padovan 342223691d75SGustavo F. Padovan parent = pchan->sk; 342323691d75SGustavo F. Padovan 34243df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 3425aa2ac881SGustavo F. Padovan lock_sock(parent); 34260a708f8fSGustavo F. Padovan 34270a708f8fSGustavo F. Padovan /* Check if the ACL is secure enough (if not SDP) */ 34282983fd68SAndrei Emeltchenko if (psm != __constant_cpu_to_le16(L2CAP_PSM_SDP) && 34290a708f8fSGustavo F. Padovan !hci_conn_check_link_mode(conn->hcon)) { 34309f5a0d7bSAndrei Emeltchenko conn->disc_reason = HCI_ERROR_AUTH_FAILURE; 34310a708f8fSGustavo F. Padovan result = L2CAP_CR_SEC_BLOCK; 34320a708f8fSGustavo F. Padovan goto response; 34330a708f8fSGustavo F. Padovan } 34340a708f8fSGustavo F. Padovan 34350a708f8fSGustavo F. Padovan result = L2CAP_CR_NO_MEM; 34360a708f8fSGustavo F. Padovan 34372dfa1003SGustavo Padovan /* Check if we already have channel with that dcid */ 34382dfa1003SGustavo Padovan if (__l2cap_get_chan_by_dcid(conn, scid)) 34392dfa1003SGustavo Padovan goto response; 34402dfa1003SGustavo Padovan 344180b98027SGustavo Padovan chan = pchan->ops->new_connection(pchan); 344280808e43SGustavo F. Padovan if (!chan) 34430a708f8fSGustavo F. Padovan goto response; 34440a708f8fSGustavo F. Padovan 344580808e43SGustavo F. Padovan sk = chan->sk; 344680808e43SGustavo F. Padovan 34470a708f8fSGustavo F. Padovan hci_conn_hold(conn->hcon); 34480a708f8fSGustavo F. Padovan 34490a708f8fSGustavo F. Padovan bacpy(&bt_sk(sk)->src, conn->src); 34500a708f8fSGustavo F. Padovan bacpy(&bt_sk(sk)->dst, conn->dst); 3451fe4128e0SGustavo F. Padovan chan->psm = psm; 3452fe4128e0SGustavo F. Padovan chan->dcid = scid; 34530a708f8fSGustavo F. Padovan 3454d1010240SGustavo F. Padovan bt_accept_enqueue(parent, sk); 3455d1010240SGustavo F. Padovan 34566be36555SAndrei Emeltchenko __l2cap_chan_add(conn, chan); 345748454079SGustavo F. Padovan 3458fe4128e0SGustavo F. Padovan dcid = chan->scid; 34590a708f8fSGustavo F. Padovan 3460c9b66675SGustavo F. Padovan __set_chan_timer(chan, sk->sk_sndtimeo); 34610a708f8fSGustavo F. Padovan 3462fc7f8a7eSGustavo F. Padovan chan->ident = cmd->ident; 34630a708f8fSGustavo F. Padovan 34640a708f8fSGustavo F. Padovan if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { 3465d45fc423SGustavo F. Padovan if (l2cap_chan_check_security(chan)) { 3466c5daa683SGustavo Padovan if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) { 34670e587be7SAndrei Emeltchenko __l2cap_state_change(chan, BT_CONNECT2); 34680a708f8fSGustavo F. Padovan result = L2CAP_CR_PEND; 34690a708f8fSGustavo F. Padovan status = L2CAP_CS_AUTHOR_PEND; 34700a708f8fSGustavo F. Padovan parent->sk_data_ready(parent, 0); 34710a708f8fSGustavo F. Padovan } else { 34720e587be7SAndrei Emeltchenko __l2cap_state_change(chan, BT_CONFIG); 34730a708f8fSGustavo F. Padovan result = L2CAP_CR_SUCCESS; 34740a708f8fSGustavo F. Padovan status = L2CAP_CS_NO_INFO; 34750a708f8fSGustavo F. Padovan } 34760a708f8fSGustavo F. Padovan } else { 34770e587be7SAndrei Emeltchenko __l2cap_state_change(chan, BT_CONNECT2); 34780a708f8fSGustavo F. Padovan result = L2CAP_CR_PEND; 34790a708f8fSGustavo F. Padovan status = L2CAP_CS_AUTHEN_PEND; 34800a708f8fSGustavo F. Padovan } 34810a708f8fSGustavo F. Padovan } else { 34820e587be7SAndrei Emeltchenko __l2cap_state_change(chan, BT_CONNECT2); 34830a708f8fSGustavo F. Padovan result = L2CAP_CR_PEND; 34840a708f8fSGustavo F. Padovan status = L2CAP_CS_NO_INFO; 34850a708f8fSGustavo F. Padovan } 34860a708f8fSGustavo F. Padovan 34870a708f8fSGustavo F. Padovan response: 3488aa2ac881SGustavo F. Padovan release_sock(parent); 34893df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 34900a708f8fSGustavo F. Padovan 34910a708f8fSGustavo F. Padovan sendresp: 34920a708f8fSGustavo F. Padovan rsp.scid = cpu_to_le16(scid); 34930a708f8fSGustavo F. Padovan rsp.dcid = cpu_to_le16(dcid); 34940a708f8fSGustavo F. Padovan rsp.result = cpu_to_le16(result); 34950a708f8fSGustavo F. Padovan rsp.status = cpu_to_le16(status); 34964c89b6aaSMat Martineau l2cap_send_cmd(conn, cmd->ident, rsp_code, sizeof(rsp), &rsp); 34970a708f8fSGustavo F. Padovan 34980a708f8fSGustavo F. Padovan if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { 34990a708f8fSGustavo F. Padovan struct l2cap_info_req info; 3500ac73498cSAndrei Emeltchenko info.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); 35010a708f8fSGustavo F. Padovan 35020a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; 35030a708f8fSGustavo F. Padovan conn->info_ident = l2cap_get_ident(conn); 35040a708f8fSGustavo F. Padovan 3505ba13ccd9SMarcel Holtmann schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); 35060a708f8fSGustavo F. Padovan 35072d792818SGustavo Padovan l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ, 35082d792818SGustavo Padovan sizeof(info), &info); 35090a708f8fSGustavo F. Padovan } 35100a708f8fSGustavo F. Padovan 3511c1360a1cSGustavo F. Padovan if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) && 35120a708f8fSGustavo F. Padovan result == L2CAP_CR_SUCCESS) { 35130a708f8fSGustavo F. Padovan u8 buf[128]; 3514c1360a1cSGustavo F. Padovan set_bit(CONF_REQ_SENT, &chan->conf_state); 35150a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 351673ffa904SGustavo F. Padovan l2cap_build_conf_req(chan, buf), buf); 351773ffa904SGustavo F. Padovan chan->num_conf_req++; 35180a708f8fSGustavo F. Padovan } 35194c89b6aaSMat Martineau } 35200a708f8fSGustavo F. Padovan 35214c89b6aaSMat Martineau static int l2cap_connect_req(struct l2cap_conn *conn, 35224c89b6aaSMat Martineau struct l2cap_cmd_hdr *cmd, u8 *data) 35234c89b6aaSMat Martineau { 35244c89b6aaSMat Martineau __l2cap_connect(conn, cmd, data, L2CAP_CONN_RSP, 0); 35250a708f8fSGustavo F. Padovan return 0; 35260a708f8fSGustavo F. Padovan } 35270a708f8fSGustavo F. Padovan 35282d792818SGustavo Padovan static inline int l2cap_connect_rsp(struct l2cap_conn *conn, 35292d792818SGustavo Padovan struct l2cap_cmd_hdr *cmd, u8 *data) 35300a708f8fSGustavo F. Padovan { 35310a708f8fSGustavo F. Padovan struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; 35320a708f8fSGustavo F. Padovan u16 scid, dcid, result, status; 353348454079SGustavo F. Padovan struct l2cap_chan *chan; 35340a708f8fSGustavo F. Padovan u8 req[128]; 35353df91ea2SAndrei Emeltchenko int err; 35360a708f8fSGustavo F. Padovan 35370a708f8fSGustavo F. Padovan scid = __le16_to_cpu(rsp->scid); 35380a708f8fSGustavo F. Padovan dcid = __le16_to_cpu(rsp->dcid); 35390a708f8fSGustavo F. Padovan result = __le16_to_cpu(rsp->result); 35400a708f8fSGustavo F. Padovan status = __le16_to_cpu(rsp->status); 35410a708f8fSGustavo F. Padovan 35421b009c98SAndrei Emeltchenko BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", 35431b009c98SAndrei Emeltchenko dcid, scid, result, status); 35440a708f8fSGustavo F. Padovan 35453df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 35463df91ea2SAndrei Emeltchenko 35470a708f8fSGustavo F. Padovan if (scid) { 35483df91ea2SAndrei Emeltchenko chan = __l2cap_get_chan_by_scid(conn, scid); 35493df91ea2SAndrei Emeltchenko if (!chan) { 35503df91ea2SAndrei Emeltchenko err = -EFAULT; 35513df91ea2SAndrei Emeltchenko goto unlock; 35523df91ea2SAndrei Emeltchenko } 35530a708f8fSGustavo F. Padovan } else { 35543df91ea2SAndrei Emeltchenko chan = __l2cap_get_chan_by_ident(conn, cmd->ident); 35553df91ea2SAndrei Emeltchenko if (!chan) { 35563df91ea2SAndrei Emeltchenko err = -EFAULT; 35573df91ea2SAndrei Emeltchenko goto unlock; 35583df91ea2SAndrei Emeltchenko } 35590a708f8fSGustavo F. Padovan } 35600a708f8fSGustavo F. Padovan 35613df91ea2SAndrei Emeltchenko err = 0; 35623df91ea2SAndrei Emeltchenko 35636be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 356448454079SGustavo F. Padovan 35650a708f8fSGustavo F. Padovan switch (result) { 35660a708f8fSGustavo F. Padovan case L2CAP_CR_SUCCESS: 356789bc500eSGustavo F. Padovan l2cap_state_change(chan, BT_CONFIG); 3568fc7f8a7eSGustavo F. Padovan chan->ident = 0; 3569fe4128e0SGustavo F. Padovan chan->dcid = dcid; 3570c1360a1cSGustavo F. Padovan clear_bit(CONF_CONNECT_PEND, &chan->conf_state); 35710a708f8fSGustavo F. Padovan 3572c1360a1cSGustavo F. Padovan if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) 35730a708f8fSGustavo F. Padovan break; 35740a708f8fSGustavo F. Padovan 35750a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 357673ffa904SGustavo F. Padovan l2cap_build_conf_req(chan, req), req); 357773ffa904SGustavo F. Padovan chan->num_conf_req++; 35780a708f8fSGustavo F. Padovan break; 35790a708f8fSGustavo F. Padovan 35800a708f8fSGustavo F. Padovan case L2CAP_CR_PEND: 3581c1360a1cSGustavo F. Padovan set_bit(CONF_CONNECT_PEND, &chan->conf_state); 35820a708f8fSGustavo F. Padovan break; 35830a708f8fSGustavo F. Padovan 35840a708f8fSGustavo F. Padovan default: 358548454079SGustavo F. Padovan l2cap_chan_del(chan, ECONNREFUSED); 35860a708f8fSGustavo F. Padovan break; 35870a708f8fSGustavo F. Padovan } 35880a708f8fSGustavo F. Padovan 35896be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 35903df91ea2SAndrei Emeltchenko 35913df91ea2SAndrei Emeltchenko unlock: 35923df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 35933df91ea2SAndrei Emeltchenko 35943df91ea2SAndrei Emeltchenko return err; 35950a708f8fSGustavo F. Padovan } 35960a708f8fSGustavo F. Padovan 359747d1ec61SGustavo F. Padovan static inline void set_default_fcs(struct l2cap_chan *chan) 35980a708f8fSGustavo F. Padovan { 35990a708f8fSGustavo F. Padovan /* FCS is enabled only in ERTM or streaming mode, if one or both 36000a708f8fSGustavo F. Padovan * sides request it. 36010a708f8fSGustavo F. Padovan */ 36020c1bc5c6SGustavo F. Padovan if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING) 360347d1ec61SGustavo F. Padovan chan->fcs = L2CAP_FCS_NONE; 3604c1360a1cSGustavo F. Padovan else if (!test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) 360547d1ec61SGustavo F. Padovan chan->fcs = L2CAP_FCS_CRC16; 36060a708f8fSGustavo F. Padovan } 36070a708f8fSGustavo F. Padovan 360829d8a590SAndrei Emeltchenko static void l2cap_send_efs_conf_rsp(struct l2cap_chan *chan, void *data, 360929d8a590SAndrei Emeltchenko u8 ident, u16 flags) 361029d8a590SAndrei Emeltchenko { 361129d8a590SAndrei Emeltchenko struct l2cap_conn *conn = chan->conn; 361229d8a590SAndrei Emeltchenko 361329d8a590SAndrei Emeltchenko BT_DBG("conn %p chan %p ident %d flags 0x%4.4x", conn, chan, ident, 361429d8a590SAndrei Emeltchenko flags); 361529d8a590SAndrei Emeltchenko 361629d8a590SAndrei Emeltchenko clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); 361729d8a590SAndrei Emeltchenko set_bit(CONF_OUTPUT_DONE, &chan->conf_state); 361829d8a590SAndrei Emeltchenko 361929d8a590SAndrei Emeltchenko l2cap_send_cmd(conn, ident, L2CAP_CONF_RSP, 362029d8a590SAndrei Emeltchenko l2cap_build_conf_rsp(chan, data, 362129d8a590SAndrei Emeltchenko L2CAP_CONF_SUCCESS, flags), data); 362229d8a590SAndrei Emeltchenko } 362329d8a590SAndrei Emeltchenko 36242d792818SGustavo Padovan static inline int l2cap_config_req(struct l2cap_conn *conn, 36252d792818SGustavo Padovan struct l2cap_cmd_hdr *cmd, u16 cmd_len, 36262d792818SGustavo Padovan u8 *data) 36270a708f8fSGustavo F. Padovan { 36280a708f8fSGustavo F. Padovan struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; 36290a708f8fSGustavo F. Padovan u16 dcid, flags; 36300a708f8fSGustavo F. Padovan u8 rsp[64]; 363148454079SGustavo F. Padovan struct l2cap_chan *chan; 36323c588192SMat Martineau int len, err = 0; 36330a708f8fSGustavo F. Padovan 36340a708f8fSGustavo F. Padovan dcid = __le16_to_cpu(req->dcid); 36350a708f8fSGustavo F. Padovan flags = __le16_to_cpu(req->flags); 36360a708f8fSGustavo F. Padovan 36370a708f8fSGustavo F. Padovan BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); 36380a708f8fSGustavo F. Padovan 3639baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, dcid); 364048454079SGustavo F. Padovan if (!chan) 36410a708f8fSGustavo F. Padovan return -ENOENT; 36420a708f8fSGustavo F. Padovan 3643033b1142SDavid S. Miller if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) { 3644e2fd318eSIlia Kolomisnky struct l2cap_cmd_rej_cid rej; 36450a708f8fSGustavo F. Padovan 3646ac73498cSAndrei Emeltchenko rej.reason = __constant_cpu_to_le16(L2CAP_REJ_INVALID_CID); 3647e2fd318eSIlia Kolomisnky rej.scid = cpu_to_le16(chan->scid); 3648e2fd318eSIlia Kolomisnky rej.dcid = cpu_to_le16(chan->dcid); 3649e2fd318eSIlia Kolomisnky 36500a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, 36510a708f8fSGustavo F. Padovan sizeof(rej), &rej); 36520a708f8fSGustavo F. Padovan goto unlock; 36530a708f8fSGustavo F. Padovan } 36540a708f8fSGustavo F. Padovan 36550a708f8fSGustavo F. Padovan /* Reject if config buffer is too small. */ 36560a708f8fSGustavo F. Padovan len = cmd_len - sizeof(*req); 36577ac28817SDan Rosenberg if (len < 0 || chan->conf_len + len > sizeof(chan->conf_req)) { 36580a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, 3659fe4128e0SGustavo F. Padovan l2cap_build_conf_rsp(chan, rsp, 36600a708f8fSGustavo F. Padovan L2CAP_CONF_REJECT, flags), rsp); 36610a708f8fSGustavo F. Padovan goto unlock; 36620a708f8fSGustavo F. Padovan } 36630a708f8fSGustavo F. Padovan 36640a708f8fSGustavo F. Padovan /* Store config. */ 366573ffa904SGustavo F. Padovan memcpy(chan->conf_req + chan->conf_len, req->data, len); 366673ffa904SGustavo F. Padovan chan->conf_len += len; 36670a708f8fSGustavo F. Padovan 366859e54bd1SAndrei Emeltchenko if (flags & L2CAP_CONF_FLAG_CONTINUATION) { 36690a708f8fSGustavo F. Padovan /* Incomplete config. Send empty response. */ 36700a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, 3671fe4128e0SGustavo F. Padovan l2cap_build_conf_rsp(chan, rsp, 36725325e5bbSAndrei Emeltchenko L2CAP_CONF_SUCCESS, flags), rsp); 36730a708f8fSGustavo F. Padovan goto unlock; 36740a708f8fSGustavo F. Padovan } 36750a708f8fSGustavo F. Padovan 36760a708f8fSGustavo F. Padovan /* Complete config. */ 367773ffa904SGustavo F. Padovan len = l2cap_parse_conf_req(chan, rsp); 36780a708f8fSGustavo F. Padovan if (len < 0) { 3679e92c8e70SGustavo F. Padovan l2cap_send_disconn_req(conn, chan, ECONNRESET); 36800a708f8fSGustavo F. Padovan goto unlock; 36810a708f8fSGustavo F. Padovan } 36820a708f8fSGustavo F. Padovan 36830a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); 368473ffa904SGustavo F. Padovan chan->num_conf_rsp++; 36850a708f8fSGustavo F. Padovan 36860a708f8fSGustavo F. Padovan /* Reset config buffer. */ 368773ffa904SGustavo F. Padovan chan->conf_len = 0; 36880a708f8fSGustavo F. Padovan 3689c1360a1cSGustavo F. Padovan if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) 36900a708f8fSGustavo F. Padovan goto unlock; 36910a708f8fSGustavo F. Padovan 3692c1360a1cSGustavo F. Padovan if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { 369347d1ec61SGustavo F. Padovan set_default_fcs(chan); 36940a708f8fSGustavo F. Padovan 3695105bdf9eSMat Martineau if (chan->mode == L2CAP_MODE_ERTM || 3696105bdf9eSMat Martineau chan->mode == L2CAP_MODE_STREAMING) 36973c588192SMat Martineau err = l2cap_ertm_init(chan); 36980a708f8fSGustavo F. Padovan 36993c588192SMat Martineau if (err < 0) 37003c588192SMat Martineau l2cap_send_disconn_req(chan->conn, chan, -err); 37013c588192SMat Martineau else 3702cf4cd009SAndrei Emeltchenko l2cap_chan_ready(chan); 37033c588192SMat Martineau 37040a708f8fSGustavo F. Padovan goto unlock; 37050a708f8fSGustavo F. Padovan } 37060a708f8fSGustavo F. Padovan 3707c1360a1cSGustavo F. Padovan if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) { 37080a708f8fSGustavo F. Padovan u8 buf[64]; 37090a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 371073ffa904SGustavo F. Padovan l2cap_build_conf_req(chan, buf), buf); 371173ffa904SGustavo F. Padovan chan->num_conf_req++; 37120a708f8fSGustavo F. Padovan } 37130a708f8fSGustavo F. Padovan 37140e8b207eSAndrei Emeltchenko /* Got Conf Rsp PENDING from remote side and asume we sent 37150e8b207eSAndrei Emeltchenko Conf Rsp PENDING in the code above */ 37160e8b207eSAndrei Emeltchenko if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) && 37170e8b207eSAndrei Emeltchenko test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { 37180e8b207eSAndrei Emeltchenko 37190e8b207eSAndrei Emeltchenko /* check compatibility */ 37200e8b207eSAndrei Emeltchenko 372129d8a590SAndrei Emeltchenko l2cap_send_efs_conf_rsp(chan, rsp, cmd->ident, flags); 37220e8b207eSAndrei Emeltchenko } 37230e8b207eSAndrei Emeltchenko 37240a708f8fSGustavo F. Padovan unlock: 37256be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 37263c588192SMat Martineau return err; 37270a708f8fSGustavo F. Padovan } 37280a708f8fSGustavo F. Padovan 37292d792818SGustavo Padovan static inline int l2cap_config_rsp(struct l2cap_conn *conn, 37302d792818SGustavo Padovan struct l2cap_cmd_hdr *cmd, u8 *data) 37310a708f8fSGustavo F. Padovan { 37320a708f8fSGustavo F. Padovan struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; 37330a708f8fSGustavo F. Padovan u16 scid, flags, result; 373448454079SGustavo F. Padovan struct l2cap_chan *chan; 373561386cbaSAndrei Emeltchenko int len = le16_to_cpu(cmd->len) - sizeof(*rsp); 37363c588192SMat Martineau int err = 0; 37370a708f8fSGustavo F. Padovan 37380a708f8fSGustavo F. Padovan scid = __le16_to_cpu(rsp->scid); 37390a708f8fSGustavo F. Padovan flags = __le16_to_cpu(rsp->flags); 37400a708f8fSGustavo F. Padovan result = __le16_to_cpu(rsp->result); 37410a708f8fSGustavo F. Padovan 374261386cbaSAndrei Emeltchenko BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags, 374361386cbaSAndrei Emeltchenko result, len); 37440a708f8fSGustavo F. Padovan 3745baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, scid); 374648454079SGustavo F. Padovan if (!chan) 37470a708f8fSGustavo F. Padovan return 0; 37480a708f8fSGustavo F. Padovan 37490a708f8fSGustavo F. Padovan switch (result) { 37500a708f8fSGustavo F. Padovan case L2CAP_CONF_SUCCESS: 375147d1ec61SGustavo F. Padovan l2cap_conf_rfc_get(chan, rsp->data, len); 37520e8b207eSAndrei Emeltchenko clear_bit(CONF_REM_CONF_PEND, &chan->conf_state); 37530a708f8fSGustavo F. Padovan break; 37540a708f8fSGustavo F. Padovan 37550e8b207eSAndrei Emeltchenko case L2CAP_CONF_PENDING: 37560e8b207eSAndrei Emeltchenko set_bit(CONF_REM_CONF_PEND, &chan->conf_state); 37570e8b207eSAndrei Emeltchenko 37580e8b207eSAndrei Emeltchenko if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { 37590e8b207eSAndrei Emeltchenko char buf[64]; 37600e8b207eSAndrei Emeltchenko 37610e8b207eSAndrei Emeltchenko len = l2cap_parse_conf_rsp(chan, rsp->data, len, 37620e8b207eSAndrei Emeltchenko buf, &result); 37630e8b207eSAndrei Emeltchenko if (len < 0) { 37640e8b207eSAndrei Emeltchenko l2cap_send_disconn_req(conn, chan, ECONNRESET); 37650e8b207eSAndrei Emeltchenko goto done; 37660e8b207eSAndrei Emeltchenko } 37670e8b207eSAndrei Emeltchenko 37680e8b207eSAndrei Emeltchenko /* check compatibility */ 37690e8b207eSAndrei Emeltchenko 377029d8a590SAndrei Emeltchenko l2cap_send_efs_conf_rsp(chan, buf, cmd->ident, 0); 37710e8b207eSAndrei Emeltchenko } 37720e8b207eSAndrei Emeltchenko goto done; 37730e8b207eSAndrei Emeltchenko 37740a708f8fSGustavo F. Padovan case L2CAP_CONF_UNACCEPT: 377573ffa904SGustavo F. Padovan if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { 37760a708f8fSGustavo F. Padovan char req[64]; 37770a708f8fSGustavo F. Padovan 37780a708f8fSGustavo F. Padovan if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { 3779e92c8e70SGustavo F. Padovan l2cap_send_disconn_req(conn, chan, ECONNRESET); 37800a708f8fSGustavo F. Padovan goto done; 37810a708f8fSGustavo F. Padovan } 37820a708f8fSGustavo F. Padovan 37830a708f8fSGustavo F. Padovan /* throw out any old stored conf requests */ 37840a708f8fSGustavo F. Padovan result = L2CAP_CONF_SUCCESS; 3785b4450035SGustavo F. Padovan len = l2cap_parse_conf_rsp(chan, rsp->data, len, 3786b4450035SGustavo F. Padovan req, &result); 37870a708f8fSGustavo F. Padovan if (len < 0) { 3788e92c8e70SGustavo F. Padovan l2cap_send_disconn_req(conn, chan, ECONNRESET); 37890a708f8fSGustavo F. Padovan goto done; 37900a708f8fSGustavo F. Padovan } 37910a708f8fSGustavo F. Padovan 37920a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), 37930a708f8fSGustavo F. Padovan L2CAP_CONF_REQ, len, req); 379473ffa904SGustavo F. Padovan chan->num_conf_req++; 37950a708f8fSGustavo F. Padovan if (result != L2CAP_CONF_SUCCESS) 37960a708f8fSGustavo F. Padovan goto done; 37970a708f8fSGustavo F. Padovan break; 37980a708f8fSGustavo F. Padovan } 37990a708f8fSGustavo F. Padovan 38000a708f8fSGustavo F. Padovan default: 38016be36555SAndrei Emeltchenko l2cap_chan_set_err(chan, ECONNRESET); 38022e0052e4SAndrei Emeltchenko 3803ba13ccd9SMarcel Holtmann __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT); 3804e92c8e70SGustavo F. Padovan l2cap_send_disconn_req(conn, chan, ECONNRESET); 38050a708f8fSGustavo F. Padovan goto done; 38060a708f8fSGustavo F. Padovan } 38070a708f8fSGustavo F. Padovan 380859e54bd1SAndrei Emeltchenko if (flags & L2CAP_CONF_FLAG_CONTINUATION) 38090a708f8fSGustavo F. Padovan goto done; 38100a708f8fSGustavo F. Padovan 3811c1360a1cSGustavo F. Padovan set_bit(CONF_INPUT_DONE, &chan->conf_state); 38120a708f8fSGustavo F. Padovan 3813c1360a1cSGustavo F. Padovan if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) { 381447d1ec61SGustavo F. Padovan set_default_fcs(chan); 38150a708f8fSGustavo F. Padovan 3816105bdf9eSMat Martineau if (chan->mode == L2CAP_MODE_ERTM || 3817105bdf9eSMat Martineau chan->mode == L2CAP_MODE_STREAMING) 38183c588192SMat Martineau err = l2cap_ertm_init(chan); 38190a708f8fSGustavo F. Padovan 38203c588192SMat Martineau if (err < 0) 38213c588192SMat Martineau l2cap_send_disconn_req(chan->conn, chan, -err); 38223c588192SMat Martineau else 3823cf4cd009SAndrei Emeltchenko l2cap_chan_ready(chan); 38240a708f8fSGustavo F. Padovan } 38250a708f8fSGustavo F. Padovan 38260a708f8fSGustavo F. Padovan done: 38276be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 38283c588192SMat Martineau return err; 38290a708f8fSGustavo F. Padovan } 38300a708f8fSGustavo F. Padovan 38312d792818SGustavo Padovan static inline int l2cap_disconnect_req(struct l2cap_conn *conn, 38322d792818SGustavo Padovan struct l2cap_cmd_hdr *cmd, u8 *data) 38330a708f8fSGustavo F. Padovan { 38340a708f8fSGustavo F. Padovan struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; 38350a708f8fSGustavo F. Padovan struct l2cap_disconn_rsp rsp; 38360a708f8fSGustavo F. Padovan u16 dcid, scid; 383748454079SGustavo F. Padovan struct l2cap_chan *chan; 38380a708f8fSGustavo F. Padovan struct sock *sk; 38390a708f8fSGustavo F. Padovan 38400a708f8fSGustavo F. Padovan scid = __le16_to_cpu(req->scid); 38410a708f8fSGustavo F. Padovan dcid = __le16_to_cpu(req->dcid); 38420a708f8fSGustavo F. Padovan 38430a708f8fSGustavo F. Padovan BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); 38440a708f8fSGustavo F. Padovan 38453df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 38463df91ea2SAndrei Emeltchenko 38473df91ea2SAndrei Emeltchenko chan = __l2cap_get_chan_by_scid(conn, dcid); 38483df91ea2SAndrei Emeltchenko if (!chan) { 38493df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 38500a708f8fSGustavo F. Padovan return 0; 38513df91ea2SAndrei Emeltchenko } 38520a708f8fSGustavo F. Padovan 38536be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 38546be36555SAndrei Emeltchenko 385548454079SGustavo F. Padovan sk = chan->sk; 385648454079SGustavo F. Padovan 3857fe4128e0SGustavo F. Padovan rsp.dcid = cpu_to_le16(chan->scid); 3858fe4128e0SGustavo F. Padovan rsp.scid = cpu_to_le16(chan->dcid); 38590a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); 38600a708f8fSGustavo F. Padovan 38616be36555SAndrei Emeltchenko lock_sock(sk); 38620a708f8fSGustavo F. Padovan sk->sk_shutdown = SHUTDOWN_MASK; 38636be36555SAndrei Emeltchenko release_sock(sk); 38640a708f8fSGustavo F. Padovan 386561d6ef3eSMat Martineau l2cap_chan_hold(chan); 386648454079SGustavo F. Padovan l2cap_chan_del(chan, ECONNRESET); 38676be36555SAndrei Emeltchenko 38686be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 38690a708f8fSGustavo F. Padovan 387080b98027SGustavo Padovan chan->ops->close(chan); 387161d6ef3eSMat Martineau l2cap_chan_put(chan); 38723df91ea2SAndrei Emeltchenko 38733df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 38743df91ea2SAndrei Emeltchenko 38750a708f8fSGustavo F. Padovan return 0; 38760a708f8fSGustavo F. Padovan } 38770a708f8fSGustavo F. Padovan 38782d792818SGustavo Padovan static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, 38792d792818SGustavo Padovan struct l2cap_cmd_hdr *cmd, u8 *data) 38800a708f8fSGustavo F. Padovan { 38810a708f8fSGustavo F. Padovan struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; 38820a708f8fSGustavo F. Padovan u16 dcid, scid; 388348454079SGustavo F. Padovan struct l2cap_chan *chan; 38840a708f8fSGustavo F. Padovan 38850a708f8fSGustavo F. Padovan scid = __le16_to_cpu(rsp->scid); 38860a708f8fSGustavo F. Padovan dcid = __le16_to_cpu(rsp->dcid); 38870a708f8fSGustavo F. Padovan 38880a708f8fSGustavo F. Padovan BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); 38890a708f8fSGustavo F. Padovan 38903df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 38913df91ea2SAndrei Emeltchenko 38923df91ea2SAndrei Emeltchenko chan = __l2cap_get_chan_by_scid(conn, scid); 38933df91ea2SAndrei Emeltchenko if (!chan) { 38943df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 38950a708f8fSGustavo F. Padovan return 0; 38963df91ea2SAndrei Emeltchenko } 38970a708f8fSGustavo F. Padovan 38986be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 389948454079SGustavo F. Padovan 390061d6ef3eSMat Martineau l2cap_chan_hold(chan); 390148454079SGustavo F. Padovan l2cap_chan_del(chan, 0); 39026be36555SAndrei Emeltchenko 39036be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 39040a708f8fSGustavo F. Padovan 390580b98027SGustavo Padovan chan->ops->close(chan); 390661d6ef3eSMat Martineau l2cap_chan_put(chan); 39073df91ea2SAndrei Emeltchenko 39083df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 39093df91ea2SAndrei Emeltchenko 39100a708f8fSGustavo F. Padovan return 0; 39110a708f8fSGustavo F. Padovan } 39120a708f8fSGustavo F. Padovan 39132d792818SGustavo Padovan static inline int l2cap_information_req(struct l2cap_conn *conn, 39142d792818SGustavo Padovan struct l2cap_cmd_hdr *cmd, u8 *data) 39150a708f8fSGustavo F. Padovan { 39160a708f8fSGustavo F. Padovan struct l2cap_info_req *req = (struct l2cap_info_req *) data; 39170a708f8fSGustavo F. Padovan u16 type; 39180a708f8fSGustavo F. Padovan 39190a708f8fSGustavo F. Padovan type = __le16_to_cpu(req->type); 39200a708f8fSGustavo F. Padovan 39210a708f8fSGustavo F. Padovan BT_DBG("type 0x%4.4x", type); 39220a708f8fSGustavo F. Padovan 39230a708f8fSGustavo F. Padovan if (type == L2CAP_IT_FEAT_MASK) { 39240a708f8fSGustavo F. Padovan u8 buf[8]; 39250a708f8fSGustavo F. Padovan u32 feat_mask = l2cap_feat_mask; 39260a708f8fSGustavo F. Padovan struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; 3927ac73498cSAndrei Emeltchenko rsp->type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); 3928ac73498cSAndrei Emeltchenko rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS); 39290a708f8fSGustavo F. Padovan if (!disable_ertm) 39300a708f8fSGustavo F. Padovan feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING 39310a708f8fSGustavo F. Padovan | L2CAP_FEAT_FCS; 3932a5fd6f30SAndrei Emeltchenko if (enable_hs) 39336327eb98SAndrei Emeltchenko feat_mask |= L2CAP_FEAT_EXT_FLOW 39346327eb98SAndrei Emeltchenko | L2CAP_FEAT_EXT_WINDOW; 3935a5fd6f30SAndrei Emeltchenko 39360a708f8fSGustavo F. Padovan put_unaligned_le32(feat_mask, rsp->data); 39372d792818SGustavo Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf), 39382d792818SGustavo Padovan buf); 39390a708f8fSGustavo F. Padovan } else if (type == L2CAP_IT_FIXED_CHAN) { 39400a708f8fSGustavo F. Padovan u8 buf[12]; 39410a708f8fSGustavo F. Padovan struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; 394250a147cdSMat Martineau 394350a147cdSMat Martineau if (enable_hs) 394450a147cdSMat Martineau l2cap_fixed_chan[0] |= L2CAP_FC_A2MP; 394550a147cdSMat Martineau else 394650a147cdSMat Martineau l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP; 394750a147cdSMat Martineau 3948ac73498cSAndrei Emeltchenko rsp->type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN); 3949ac73498cSAndrei Emeltchenko rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS); 3950c6337ea6SAndrei Emeltchenko memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan)); 39512d792818SGustavo Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf), 39522d792818SGustavo Padovan buf); 39530a708f8fSGustavo F. Padovan } else { 39540a708f8fSGustavo F. Padovan struct l2cap_info_rsp rsp; 39550a708f8fSGustavo F. Padovan rsp.type = cpu_to_le16(type); 3956ac73498cSAndrei Emeltchenko rsp.result = __constant_cpu_to_le16(L2CAP_IR_NOTSUPP); 39572d792818SGustavo Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(rsp), 39582d792818SGustavo Padovan &rsp); 39590a708f8fSGustavo F. Padovan } 39600a708f8fSGustavo F. Padovan 39610a708f8fSGustavo F. Padovan return 0; 39620a708f8fSGustavo F. Padovan } 39630a708f8fSGustavo F. Padovan 39642d792818SGustavo Padovan static inline int l2cap_information_rsp(struct l2cap_conn *conn, 39652d792818SGustavo Padovan struct l2cap_cmd_hdr *cmd, u8 *data) 39660a708f8fSGustavo F. Padovan { 39670a708f8fSGustavo F. Padovan struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; 39680a708f8fSGustavo F. Padovan u16 type, result; 39690a708f8fSGustavo F. Padovan 39700a708f8fSGustavo F. Padovan type = __le16_to_cpu(rsp->type); 39710a708f8fSGustavo F. Padovan result = __le16_to_cpu(rsp->result); 39720a708f8fSGustavo F. Padovan 39730a708f8fSGustavo F. Padovan BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); 39740a708f8fSGustavo F. Padovan 3975e90165beSAndrei Emeltchenko /* L2CAP Info req/rsp are unbound to channels, add extra checks */ 3976e90165beSAndrei Emeltchenko if (cmd->ident != conn->info_ident || 3977e90165beSAndrei Emeltchenko conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) 3978e90165beSAndrei Emeltchenko return 0; 3979e90165beSAndrei Emeltchenko 398017cd3f37SUlisses Furquim cancel_delayed_work(&conn->info_timer); 39810a708f8fSGustavo F. Padovan 39820a708f8fSGustavo F. Padovan if (result != L2CAP_IR_SUCCESS) { 39830a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 39840a708f8fSGustavo F. Padovan conn->info_ident = 0; 39850a708f8fSGustavo F. Padovan 39860a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 39870a708f8fSGustavo F. Padovan 39880a708f8fSGustavo F. Padovan return 0; 39890a708f8fSGustavo F. Padovan } 39900a708f8fSGustavo F. Padovan 3991978c93b9SAndrei Emeltchenko switch (type) { 3992978c93b9SAndrei Emeltchenko case L2CAP_IT_FEAT_MASK: 39930a708f8fSGustavo F. Padovan conn->feat_mask = get_unaligned_le32(rsp->data); 39940a708f8fSGustavo F. Padovan 39950a708f8fSGustavo F. Padovan if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { 39960a708f8fSGustavo F. Padovan struct l2cap_info_req req; 3997ac73498cSAndrei Emeltchenko req.type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN); 39980a708f8fSGustavo F. Padovan 39990a708f8fSGustavo F. Padovan conn->info_ident = l2cap_get_ident(conn); 40000a708f8fSGustavo F. Padovan 40010a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, conn->info_ident, 40020a708f8fSGustavo F. Padovan L2CAP_INFO_REQ, sizeof(req), &req); 40030a708f8fSGustavo F. Padovan } else { 40040a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 40050a708f8fSGustavo F. Padovan conn->info_ident = 0; 40060a708f8fSGustavo F. Padovan 40070a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 40080a708f8fSGustavo F. Padovan } 4009978c93b9SAndrei Emeltchenko break; 4010978c93b9SAndrei Emeltchenko 4011978c93b9SAndrei Emeltchenko case L2CAP_IT_FIXED_CHAN: 4012978c93b9SAndrei Emeltchenko conn->fixed_chan_mask = rsp->data[0]; 40130a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 40140a708f8fSGustavo F. Padovan conn->info_ident = 0; 40150a708f8fSGustavo F. Padovan 40160a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 4017978c93b9SAndrei Emeltchenko break; 40180a708f8fSGustavo F. Padovan } 40190a708f8fSGustavo F. Padovan 40200a708f8fSGustavo F. Padovan return 0; 40210a708f8fSGustavo F. Padovan } 40220a708f8fSGustavo F. Padovan 4023f94ff6ffSMat Martineau static inline int l2cap_create_channel_req(struct l2cap_conn *conn, 40242d792818SGustavo Padovan struct l2cap_cmd_hdr *cmd, 40252d792818SGustavo Padovan u16 cmd_len, void *data) 4026f94ff6ffSMat Martineau { 4027f94ff6ffSMat Martineau struct l2cap_create_chan_req *req = data; 4028f94ff6ffSMat Martineau struct l2cap_create_chan_rsp rsp; 4029f94ff6ffSMat Martineau u16 psm, scid; 4030f94ff6ffSMat Martineau 4031f94ff6ffSMat Martineau if (cmd_len != sizeof(*req)) 4032f94ff6ffSMat Martineau return -EPROTO; 4033f94ff6ffSMat Martineau 4034f94ff6ffSMat Martineau if (!enable_hs) 4035f94ff6ffSMat Martineau return -EINVAL; 4036f94ff6ffSMat Martineau 4037f94ff6ffSMat Martineau psm = le16_to_cpu(req->psm); 4038f94ff6ffSMat Martineau scid = le16_to_cpu(req->scid); 4039f94ff6ffSMat Martineau 4040ad0ac6caSAndrei Emeltchenko BT_DBG("psm 0x%2.2x, scid 0x%4.4x, amp_id %d", psm, scid, req->amp_id); 4041f94ff6ffSMat Martineau 4042f94ff6ffSMat Martineau /* Placeholder: Always reject */ 4043f94ff6ffSMat Martineau rsp.dcid = 0; 4044f94ff6ffSMat Martineau rsp.scid = cpu_to_le16(scid); 40458ce0c498SAndrei Emeltchenko rsp.result = __constant_cpu_to_le16(L2CAP_CR_NO_MEM); 40468ce0c498SAndrei Emeltchenko rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); 4047f94ff6ffSMat Martineau 4048f94ff6ffSMat Martineau l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP, 4049f94ff6ffSMat Martineau sizeof(rsp), &rsp); 4050f94ff6ffSMat Martineau 4051f94ff6ffSMat Martineau return 0; 4052f94ff6ffSMat Martineau } 4053f94ff6ffSMat Martineau 40542d792818SGustavo Padovan static inline int l2cap_create_channel_rsp(struct l2cap_conn *conn, 40552d792818SGustavo Padovan struct l2cap_cmd_hdr *cmd, 40562d792818SGustavo Padovan void *data) 40572d792818SGustavo Padovan { 40582d792818SGustavo Padovan BT_DBG("conn %p", conn); 40592d792818SGustavo Padovan 40602d792818SGustavo Padovan return l2cap_connect_rsp(conn, cmd, data); 40612d792818SGustavo Padovan } 40622d792818SGustavo Padovan 40638d5a04a1SMat Martineau static void l2cap_send_move_chan_rsp(struct l2cap_conn *conn, u8 ident, 40648d5a04a1SMat Martineau u16 icid, u16 result) 40658d5a04a1SMat Martineau { 40668d5a04a1SMat Martineau struct l2cap_move_chan_rsp rsp; 40678d5a04a1SMat Martineau 4068ad0ac6caSAndrei Emeltchenko BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); 40698d5a04a1SMat Martineau 40708d5a04a1SMat Martineau rsp.icid = cpu_to_le16(icid); 40718d5a04a1SMat Martineau rsp.result = cpu_to_le16(result); 40728d5a04a1SMat Martineau 40738d5a04a1SMat Martineau l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_RSP, sizeof(rsp), &rsp); 40748d5a04a1SMat Martineau } 40758d5a04a1SMat Martineau 40768d5a04a1SMat Martineau static void l2cap_send_move_chan_cfm(struct l2cap_conn *conn, 4077ad0ac6caSAndrei Emeltchenko struct l2cap_chan *chan, 4078ad0ac6caSAndrei Emeltchenko u16 icid, u16 result) 40798d5a04a1SMat Martineau { 40808d5a04a1SMat Martineau struct l2cap_move_chan_cfm cfm; 40818d5a04a1SMat Martineau u8 ident; 40828d5a04a1SMat Martineau 4083ad0ac6caSAndrei Emeltchenko BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); 40848d5a04a1SMat Martineau 40858d5a04a1SMat Martineau ident = l2cap_get_ident(conn); 40868d5a04a1SMat Martineau if (chan) 40878d5a04a1SMat Martineau chan->ident = ident; 40888d5a04a1SMat Martineau 40898d5a04a1SMat Martineau cfm.icid = cpu_to_le16(icid); 40908d5a04a1SMat Martineau cfm.result = cpu_to_le16(result); 40918d5a04a1SMat Martineau 40928d5a04a1SMat Martineau l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM, sizeof(cfm), &cfm); 40938d5a04a1SMat Martineau } 40948d5a04a1SMat Martineau 40958d5a04a1SMat Martineau static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident, 40968d5a04a1SMat Martineau u16 icid) 40978d5a04a1SMat Martineau { 40988d5a04a1SMat Martineau struct l2cap_move_chan_cfm_rsp rsp; 40998d5a04a1SMat Martineau 4100ad0ac6caSAndrei Emeltchenko BT_DBG("icid 0x%4.4x", icid); 41018d5a04a1SMat Martineau 41028d5a04a1SMat Martineau rsp.icid = cpu_to_le16(icid); 41038d5a04a1SMat Martineau l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp); 41048d5a04a1SMat Martineau } 41058d5a04a1SMat Martineau 41068d5a04a1SMat Martineau static inline int l2cap_move_channel_req(struct l2cap_conn *conn, 4107ad0ac6caSAndrei Emeltchenko struct l2cap_cmd_hdr *cmd, 4108ad0ac6caSAndrei Emeltchenko u16 cmd_len, void *data) 41098d5a04a1SMat Martineau { 41108d5a04a1SMat Martineau struct l2cap_move_chan_req *req = data; 41118d5a04a1SMat Martineau u16 icid = 0; 41128d5a04a1SMat Martineau u16 result = L2CAP_MR_NOT_ALLOWED; 41138d5a04a1SMat Martineau 41148d5a04a1SMat Martineau if (cmd_len != sizeof(*req)) 41158d5a04a1SMat Martineau return -EPROTO; 41168d5a04a1SMat Martineau 41178d5a04a1SMat Martineau icid = le16_to_cpu(req->icid); 41188d5a04a1SMat Martineau 4119ad0ac6caSAndrei Emeltchenko BT_DBG("icid 0x%4.4x, dest_amp_id %d", icid, req->dest_amp_id); 41208d5a04a1SMat Martineau 41218d5a04a1SMat Martineau if (!enable_hs) 41228d5a04a1SMat Martineau return -EINVAL; 41238d5a04a1SMat Martineau 41248d5a04a1SMat Martineau /* Placeholder: Always refuse */ 41258d5a04a1SMat Martineau l2cap_send_move_chan_rsp(conn, cmd->ident, icid, result); 41268d5a04a1SMat Martineau 41278d5a04a1SMat Martineau return 0; 41288d5a04a1SMat Martineau } 41298d5a04a1SMat Martineau 41308d5a04a1SMat Martineau static inline int l2cap_move_channel_rsp(struct l2cap_conn *conn, 4131ad0ac6caSAndrei Emeltchenko struct l2cap_cmd_hdr *cmd, 4132ad0ac6caSAndrei Emeltchenko u16 cmd_len, void *data) 41338d5a04a1SMat Martineau { 41348d5a04a1SMat Martineau struct l2cap_move_chan_rsp *rsp = data; 41358d5a04a1SMat Martineau u16 icid, result; 41368d5a04a1SMat Martineau 41378d5a04a1SMat Martineau if (cmd_len != sizeof(*rsp)) 41388d5a04a1SMat Martineau return -EPROTO; 41398d5a04a1SMat Martineau 41408d5a04a1SMat Martineau icid = le16_to_cpu(rsp->icid); 41418d5a04a1SMat Martineau result = le16_to_cpu(rsp->result); 41428d5a04a1SMat Martineau 4143ad0ac6caSAndrei Emeltchenko BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); 41448d5a04a1SMat Martineau 41458d5a04a1SMat Martineau /* Placeholder: Always unconfirmed */ 41468d5a04a1SMat Martineau l2cap_send_move_chan_cfm(conn, NULL, icid, L2CAP_MC_UNCONFIRMED); 41478d5a04a1SMat Martineau 41488d5a04a1SMat Martineau return 0; 41498d5a04a1SMat Martineau } 41508d5a04a1SMat Martineau 41518d5a04a1SMat Martineau static inline int l2cap_move_channel_confirm(struct l2cap_conn *conn, 4152ad0ac6caSAndrei Emeltchenko struct l2cap_cmd_hdr *cmd, 4153ad0ac6caSAndrei Emeltchenko u16 cmd_len, void *data) 41548d5a04a1SMat Martineau { 41558d5a04a1SMat Martineau struct l2cap_move_chan_cfm *cfm = data; 41568d5a04a1SMat Martineau u16 icid, result; 41578d5a04a1SMat Martineau 41588d5a04a1SMat Martineau if (cmd_len != sizeof(*cfm)) 41598d5a04a1SMat Martineau return -EPROTO; 41608d5a04a1SMat Martineau 41618d5a04a1SMat Martineau icid = le16_to_cpu(cfm->icid); 41628d5a04a1SMat Martineau result = le16_to_cpu(cfm->result); 41638d5a04a1SMat Martineau 4164ad0ac6caSAndrei Emeltchenko BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); 41658d5a04a1SMat Martineau 41668d5a04a1SMat Martineau l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); 41678d5a04a1SMat Martineau 41688d5a04a1SMat Martineau return 0; 41698d5a04a1SMat Martineau } 41708d5a04a1SMat Martineau 41718d5a04a1SMat Martineau static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn, 4172ad0ac6caSAndrei Emeltchenko struct l2cap_cmd_hdr *cmd, 4173ad0ac6caSAndrei Emeltchenko u16 cmd_len, void *data) 41748d5a04a1SMat Martineau { 41758d5a04a1SMat Martineau struct l2cap_move_chan_cfm_rsp *rsp = data; 41768d5a04a1SMat Martineau u16 icid; 41778d5a04a1SMat Martineau 41788d5a04a1SMat Martineau if (cmd_len != sizeof(*rsp)) 41798d5a04a1SMat Martineau return -EPROTO; 41808d5a04a1SMat Martineau 41818d5a04a1SMat Martineau icid = le16_to_cpu(rsp->icid); 41828d5a04a1SMat Martineau 4183ad0ac6caSAndrei Emeltchenko BT_DBG("icid 0x%4.4x", icid); 41848d5a04a1SMat Martineau 41858d5a04a1SMat Martineau return 0; 41868d5a04a1SMat Martineau } 41878d5a04a1SMat Martineau 4188e2174ca4SGustavo F. Padovan static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency, 4189de73115aSClaudio Takahasi u16 to_multiplier) 4190de73115aSClaudio Takahasi { 4191de73115aSClaudio Takahasi u16 max_latency; 4192de73115aSClaudio Takahasi 4193de73115aSClaudio Takahasi if (min > max || min < 6 || max > 3200) 4194de73115aSClaudio Takahasi return -EINVAL; 4195de73115aSClaudio Takahasi 4196de73115aSClaudio Takahasi if (to_multiplier < 10 || to_multiplier > 3200) 4197de73115aSClaudio Takahasi return -EINVAL; 4198de73115aSClaudio Takahasi 4199de73115aSClaudio Takahasi if (max >= to_multiplier * 8) 4200de73115aSClaudio Takahasi return -EINVAL; 4201de73115aSClaudio Takahasi 4202de73115aSClaudio Takahasi max_latency = (to_multiplier * 8 / max) - 1; 4203de73115aSClaudio Takahasi if (latency > 499 || latency > max_latency) 4204de73115aSClaudio Takahasi return -EINVAL; 4205de73115aSClaudio Takahasi 4206de73115aSClaudio Takahasi return 0; 4207de73115aSClaudio Takahasi } 4208de73115aSClaudio Takahasi 4209de73115aSClaudio Takahasi static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, 42102d792818SGustavo Padovan struct l2cap_cmd_hdr *cmd, 42112d792818SGustavo Padovan u8 *data) 4212de73115aSClaudio Takahasi { 4213de73115aSClaudio Takahasi struct hci_conn *hcon = conn->hcon; 4214de73115aSClaudio Takahasi struct l2cap_conn_param_update_req *req; 4215de73115aSClaudio Takahasi struct l2cap_conn_param_update_rsp rsp; 4216de73115aSClaudio Takahasi u16 min, max, latency, to_multiplier, cmd_len; 42172ce603ebSClaudio Takahasi int err; 4218de73115aSClaudio Takahasi 4219de73115aSClaudio Takahasi if (!(hcon->link_mode & HCI_LM_MASTER)) 4220de73115aSClaudio Takahasi return -EINVAL; 4221de73115aSClaudio Takahasi 4222de73115aSClaudio Takahasi cmd_len = __le16_to_cpu(cmd->len); 4223de73115aSClaudio Takahasi if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) 4224de73115aSClaudio Takahasi return -EPROTO; 4225de73115aSClaudio Takahasi 4226de73115aSClaudio Takahasi req = (struct l2cap_conn_param_update_req *) data; 4227de73115aSClaudio Takahasi min = __le16_to_cpu(req->min); 4228de73115aSClaudio Takahasi max = __le16_to_cpu(req->max); 4229de73115aSClaudio Takahasi latency = __le16_to_cpu(req->latency); 4230de73115aSClaudio Takahasi to_multiplier = __le16_to_cpu(req->to_multiplier); 4231de73115aSClaudio Takahasi 4232de73115aSClaudio Takahasi BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", 4233de73115aSClaudio Takahasi min, max, latency, to_multiplier); 4234de73115aSClaudio Takahasi 4235de73115aSClaudio Takahasi memset(&rsp, 0, sizeof(rsp)); 42362ce603ebSClaudio Takahasi 42372ce603ebSClaudio Takahasi err = l2cap_check_conn_param(min, max, latency, to_multiplier); 42382ce603ebSClaudio Takahasi if (err) 4239ac73498cSAndrei Emeltchenko rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); 4240de73115aSClaudio Takahasi else 4241ac73498cSAndrei Emeltchenko rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); 4242de73115aSClaudio Takahasi 4243de73115aSClaudio Takahasi l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, 4244de73115aSClaudio Takahasi sizeof(rsp), &rsp); 4245de73115aSClaudio Takahasi 42462ce603ebSClaudio Takahasi if (!err) 42472ce603ebSClaudio Takahasi hci_le_conn_update(hcon, min, max, latency, to_multiplier); 42482ce603ebSClaudio Takahasi 4249de73115aSClaudio Takahasi return 0; 4250de73115aSClaudio Takahasi } 4251de73115aSClaudio Takahasi 42523300d9a9SClaudio Takahasi static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, 42532d792818SGustavo Padovan struct l2cap_cmd_hdr *cmd, u16 cmd_len, 42542d792818SGustavo Padovan u8 *data) 42553300d9a9SClaudio Takahasi { 42563300d9a9SClaudio Takahasi int err = 0; 42573300d9a9SClaudio Takahasi 42583300d9a9SClaudio Takahasi switch (cmd->code) { 42593300d9a9SClaudio Takahasi case L2CAP_COMMAND_REJ: 42603300d9a9SClaudio Takahasi l2cap_command_rej(conn, cmd, data); 42613300d9a9SClaudio Takahasi break; 42623300d9a9SClaudio Takahasi 42633300d9a9SClaudio Takahasi case L2CAP_CONN_REQ: 42643300d9a9SClaudio Takahasi err = l2cap_connect_req(conn, cmd, data); 42653300d9a9SClaudio Takahasi break; 42663300d9a9SClaudio Takahasi 42673300d9a9SClaudio Takahasi case L2CAP_CONN_RSP: 4268f5a2598dSMat Martineau case L2CAP_CREATE_CHAN_RSP: 42693300d9a9SClaudio Takahasi err = l2cap_connect_rsp(conn, cmd, data); 42703300d9a9SClaudio Takahasi break; 42713300d9a9SClaudio Takahasi 42723300d9a9SClaudio Takahasi case L2CAP_CONF_REQ: 42733300d9a9SClaudio Takahasi err = l2cap_config_req(conn, cmd, cmd_len, data); 42743300d9a9SClaudio Takahasi break; 42753300d9a9SClaudio Takahasi 42763300d9a9SClaudio Takahasi case L2CAP_CONF_RSP: 42773300d9a9SClaudio Takahasi err = l2cap_config_rsp(conn, cmd, data); 42783300d9a9SClaudio Takahasi break; 42793300d9a9SClaudio Takahasi 42803300d9a9SClaudio Takahasi case L2CAP_DISCONN_REQ: 42813300d9a9SClaudio Takahasi err = l2cap_disconnect_req(conn, cmd, data); 42823300d9a9SClaudio Takahasi break; 42833300d9a9SClaudio Takahasi 42843300d9a9SClaudio Takahasi case L2CAP_DISCONN_RSP: 42853300d9a9SClaudio Takahasi err = l2cap_disconnect_rsp(conn, cmd, data); 42863300d9a9SClaudio Takahasi break; 42873300d9a9SClaudio Takahasi 42883300d9a9SClaudio Takahasi case L2CAP_ECHO_REQ: 42893300d9a9SClaudio Takahasi l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); 42903300d9a9SClaudio Takahasi break; 42913300d9a9SClaudio Takahasi 42923300d9a9SClaudio Takahasi case L2CAP_ECHO_RSP: 42933300d9a9SClaudio Takahasi break; 42943300d9a9SClaudio Takahasi 42953300d9a9SClaudio Takahasi case L2CAP_INFO_REQ: 42963300d9a9SClaudio Takahasi err = l2cap_information_req(conn, cmd, data); 42973300d9a9SClaudio Takahasi break; 42983300d9a9SClaudio Takahasi 42993300d9a9SClaudio Takahasi case L2CAP_INFO_RSP: 43003300d9a9SClaudio Takahasi err = l2cap_information_rsp(conn, cmd, data); 43013300d9a9SClaudio Takahasi break; 43023300d9a9SClaudio Takahasi 4303f94ff6ffSMat Martineau case L2CAP_CREATE_CHAN_REQ: 4304f94ff6ffSMat Martineau err = l2cap_create_channel_req(conn, cmd, cmd_len, data); 4305f94ff6ffSMat Martineau break; 4306f94ff6ffSMat Martineau 43078d5a04a1SMat Martineau case L2CAP_MOVE_CHAN_REQ: 43088d5a04a1SMat Martineau err = l2cap_move_channel_req(conn, cmd, cmd_len, data); 43098d5a04a1SMat Martineau break; 43108d5a04a1SMat Martineau 43118d5a04a1SMat Martineau case L2CAP_MOVE_CHAN_RSP: 43128d5a04a1SMat Martineau err = l2cap_move_channel_rsp(conn, cmd, cmd_len, data); 43138d5a04a1SMat Martineau break; 43148d5a04a1SMat Martineau 43158d5a04a1SMat Martineau case L2CAP_MOVE_CHAN_CFM: 43168d5a04a1SMat Martineau err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data); 43178d5a04a1SMat Martineau break; 43188d5a04a1SMat Martineau 43198d5a04a1SMat Martineau case L2CAP_MOVE_CHAN_CFM_RSP: 43208d5a04a1SMat Martineau err = l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data); 43218d5a04a1SMat Martineau break; 43228d5a04a1SMat Martineau 43233300d9a9SClaudio Takahasi default: 43243300d9a9SClaudio Takahasi BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); 43253300d9a9SClaudio Takahasi err = -EINVAL; 43263300d9a9SClaudio Takahasi break; 43273300d9a9SClaudio Takahasi } 43283300d9a9SClaudio Takahasi 43293300d9a9SClaudio Takahasi return err; 43303300d9a9SClaudio Takahasi } 43313300d9a9SClaudio Takahasi 43323300d9a9SClaudio Takahasi static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, 43333300d9a9SClaudio Takahasi struct l2cap_cmd_hdr *cmd, u8 *data) 43343300d9a9SClaudio Takahasi { 43353300d9a9SClaudio Takahasi switch (cmd->code) { 43363300d9a9SClaudio Takahasi case L2CAP_COMMAND_REJ: 43373300d9a9SClaudio Takahasi return 0; 43383300d9a9SClaudio Takahasi 43393300d9a9SClaudio Takahasi case L2CAP_CONN_PARAM_UPDATE_REQ: 4340de73115aSClaudio Takahasi return l2cap_conn_param_update_req(conn, cmd, data); 43413300d9a9SClaudio Takahasi 43423300d9a9SClaudio Takahasi case L2CAP_CONN_PARAM_UPDATE_RSP: 43433300d9a9SClaudio Takahasi return 0; 43443300d9a9SClaudio Takahasi 43453300d9a9SClaudio Takahasi default: 43463300d9a9SClaudio Takahasi BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); 43473300d9a9SClaudio Takahasi return -EINVAL; 43483300d9a9SClaudio Takahasi } 43493300d9a9SClaudio Takahasi } 43503300d9a9SClaudio Takahasi 43513300d9a9SClaudio Takahasi static inline void l2cap_sig_channel(struct l2cap_conn *conn, 43523300d9a9SClaudio Takahasi struct sk_buff *skb) 43530a708f8fSGustavo F. Padovan { 43540a708f8fSGustavo F. Padovan u8 *data = skb->data; 43550a708f8fSGustavo F. Padovan int len = skb->len; 43560a708f8fSGustavo F. Padovan struct l2cap_cmd_hdr cmd; 43573300d9a9SClaudio Takahasi int err; 43580a708f8fSGustavo F. Padovan 43590a708f8fSGustavo F. Padovan l2cap_raw_recv(conn, skb); 43600a708f8fSGustavo F. Padovan 43610a708f8fSGustavo F. Padovan while (len >= L2CAP_CMD_HDR_SIZE) { 43620a708f8fSGustavo F. Padovan u16 cmd_len; 43630a708f8fSGustavo F. Padovan memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); 43640a708f8fSGustavo F. Padovan data += L2CAP_CMD_HDR_SIZE; 43650a708f8fSGustavo F. Padovan len -= L2CAP_CMD_HDR_SIZE; 43660a708f8fSGustavo F. Padovan 43670a708f8fSGustavo F. Padovan cmd_len = le16_to_cpu(cmd.len); 43680a708f8fSGustavo F. Padovan 43692d792818SGustavo Padovan BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, 43702d792818SGustavo Padovan cmd.ident); 43710a708f8fSGustavo F. Padovan 43720a708f8fSGustavo F. Padovan if (cmd_len > len || !cmd.ident) { 43730a708f8fSGustavo F. Padovan BT_DBG("corrupted command"); 43740a708f8fSGustavo F. Padovan break; 43750a708f8fSGustavo F. Padovan } 43760a708f8fSGustavo F. Padovan 43773300d9a9SClaudio Takahasi if (conn->hcon->type == LE_LINK) 43783300d9a9SClaudio Takahasi err = l2cap_le_sig_cmd(conn, &cmd, data); 43793300d9a9SClaudio Takahasi else 43803300d9a9SClaudio Takahasi err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); 43810a708f8fSGustavo F. Padovan 43820a708f8fSGustavo F. Padovan if (err) { 4383e2fd318eSIlia Kolomisnky struct l2cap_cmd_rej_unk rej; 43842c6d1a2eSGustavo F. Padovan 43852c6d1a2eSGustavo F. Padovan BT_ERR("Wrong link type (%d)", err); 43860a708f8fSGustavo F. Padovan 43870a708f8fSGustavo F. Padovan /* FIXME: Map err to a valid reason */ 4388ac73498cSAndrei Emeltchenko rej.reason = __constant_cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); 43892d792818SGustavo Padovan l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, 43902d792818SGustavo Padovan sizeof(rej), &rej); 43910a708f8fSGustavo F. Padovan } 43920a708f8fSGustavo F. Padovan 43930a708f8fSGustavo F. Padovan data += cmd_len; 43940a708f8fSGustavo F. Padovan len -= cmd_len; 43950a708f8fSGustavo F. Padovan } 43960a708f8fSGustavo F. Padovan 43970a708f8fSGustavo F. Padovan kfree_skb(skb); 43980a708f8fSGustavo F. Padovan } 43990a708f8fSGustavo F. Padovan 440047d1ec61SGustavo F. Padovan static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb) 44010a708f8fSGustavo F. Padovan { 44020a708f8fSGustavo F. Padovan u16 our_fcs, rcv_fcs; 4403e4ca6d98SAndrei Emeltchenko int hdr_size; 4404e4ca6d98SAndrei Emeltchenko 4405e4ca6d98SAndrei Emeltchenko if (test_bit(FLAG_EXT_CTRL, &chan->flags)) 4406e4ca6d98SAndrei Emeltchenko hdr_size = L2CAP_EXT_HDR_SIZE; 4407e4ca6d98SAndrei Emeltchenko else 4408e4ca6d98SAndrei Emeltchenko hdr_size = L2CAP_ENH_HDR_SIZE; 44090a708f8fSGustavo F. Padovan 441047d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) { 441103a51213SAndrei Emeltchenko skb_trim(skb, skb->len - L2CAP_FCS_SIZE); 44120a708f8fSGustavo F. Padovan rcv_fcs = get_unaligned_le16(skb->data + skb->len); 44130a708f8fSGustavo F. Padovan our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); 44140a708f8fSGustavo F. Padovan 44150a708f8fSGustavo F. Padovan if (our_fcs != rcv_fcs) 44160a708f8fSGustavo F. Padovan return -EBADMSG; 44170a708f8fSGustavo F. Padovan } 44180a708f8fSGustavo F. Padovan return 0; 44190a708f8fSGustavo F. Padovan } 44200a708f8fSGustavo F. Padovan 44216ea00485SMat Martineau static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) 44220a708f8fSGustavo F. Padovan { 4423e31f7633SMat Martineau struct l2cap_ctrl control; 44240a708f8fSGustavo F. Padovan 4425e31f7633SMat Martineau BT_DBG("chan %p", chan); 44260a708f8fSGustavo F. Padovan 4427e31f7633SMat Martineau memset(&control, 0, sizeof(control)); 4428e31f7633SMat Martineau control.sframe = 1; 4429e31f7633SMat Martineau control.final = 1; 4430e31f7633SMat Martineau control.reqseq = chan->buffer_seq; 4431e31f7633SMat Martineau set_bit(CONN_SEND_FBIT, &chan->conn_state); 44320a708f8fSGustavo F. Padovan 4433e2ab4353SGustavo F. Padovan if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { 4434e31f7633SMat Martineau control.super = L2CAP_SUPER_RNR; 4435e31f7633SMat Martineau l2cap_send_sframe(chan, &control); 44360a708f8fSGustavo F. Padovan } 44370a708f8fSGustavo F. Padovan 4438e31f7633SMat Martineau if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) && 4439e31f7633SMat Martineau chan->unacked_frames > 0) 4440e31f7633SMat Martineau __set_retrans_timer(chan); 44410a708f8fSGustavo F. Padovan 4442e31f7633SMat Martineau /* Send pending iframes */ 4443525cd185SGustavo F. Padovan l2cap_ertm_send(chan); 44440a708f8fSGustavo F. Padovan 4445e2ab4353SGustavo F. Padovan if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && 4446e31f7633SMat Martineau test_bit(CONN_SEND_FBIT, &chan->conn_state)) { 4447e31f7633SMat Martineau /* F-bit wasn't sent in an s-frame or i-frame yet, so 4448e31f7633SMat Martineau * send it now. 4449e31f7633SMat Martineau */ 4450e31f7633SMat Martineau control.super = L2CAP_SUPER_RR; 4451e31f7633SMat Martineau l2cap_send_sframe(chan, &control); 44520a708f8fSGustavo F. Padovan } 44530a708f8fSGustavo F. Padovan } 44540a708f8fSGustavo F. Padovan 44552d792818SGustavo Padovan static void append_skb_frag(struct sk_buff *skb, struct sk_buff *new_frag, 44562d792818SGustavo Padovan struct sk_buff **last_frag) 44570a708f8fSGustavo F. Padovan { 445884084a31SMat Martineau /* skb->len reflects data in skb as well as all fragments 445984084a31SMat Martineau * skb->data_len reflects only data in fragments 446084084a31SMat Martineau */ 446184084a31SMat Martineau if (!skb_has_frag_list(skb)) 446284084a31SMat Martineau skb_shinfo(skb)->frag_list = new_frag; 446384084a31SMat Martineau 446484084a31SMat Martineau new_frag->next = NULL; 446584084a31SMat Martineau 446684084a31SMat Martineau (*last_frag)->next = new_frag; 446784084a31SMat Martineau *last_frag = new_frag; 446884084a31SMat Martineau 446984084a31SMat Martineau skb->len += new_frag->len; 447084084a31SMat Martineau skb->data_len += new_frag->len; 447184084a31SMat Martineau skb->truesize += new_frag->truesize; 447284084a31SMat Martineau } 447384084a31SMat Martineau 44744b51dae9SMat Martineau static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb, 44754b51dae9SMat Martineau struct l2cap_ctrl *control) 447684084a31SMat Martineau { 447784084a31SMat Martineau int err = -EINVAL; 44780a708f8fSGustavo F. Padovan 44794b51dae9SMat Martineau switch (control->sar) { 44807e0ef6eeSAndrei Emeltchenko case L2CAP_SAR_UNSEGMENTED: 448184084a31SMat Martineau if (chan->sdu) 448284084a31SMat Martineau break; 44830a708f8fSGustavo F. Padovan 448480b98027SGustavo Padovan err = chan->ops->recv(chan, skb); 448584084a31SMat Martineau break; 44860a708f8fSGustavo F. Padovan 44877e0ef6eeSAndrei Emeltchenko case L2CAP_SAR_START: 448884084a31SMat Martineau if (chan->sdu) 448984084a31SMat Martineau break; 44900a708f8fSGustavo F. Padovan 44916f61fd47SGustavo F. Padovan chan->sdu_len = get_unaligned_le16(skb->data); 449203a51213SAndrei Emeltchenko skb_pull(skb, L2CAP_SDULEN_SIZE); 44930a708f8fSGustavo F. Padovan 449484084a31SMat Martineau if (chan->sdu_len > chan->imtu) { 449584084a31SMat Martineau err = -EMSGSIZE; 449684084a31SMat Martineau break; 449784084a31SMat Martineau } 44980a708f8fSGustavo F. Padovan 449984084a31SMat Martineau if (skb->len >= chan->sdu_len) 450084084a31SMat Martineau break; 450184084a31SMat Martineau 450284084a31SMat Martineau chan->sdu = skb; 450384084a31SMat Martineau chan->sdu_last_frag = skb; 450484084a31SMat Martineau 450584084a31SMat Martineau skb = NULL; 450684084a31SMat Martineau err = 0; 45070a708f8fSGustavo F. Padovan break; 45080a708f8fSGustavo F. Padovan 45097e0ef6eeSAndrei Emeltchenko case L2CAP_SAR_CONTINUE: 45106f61fd47SGustavo F. Padovan if (!chan->sdu) 451184084a31SMat Martineau break; 45120a708f8fSGustavo F. Padovan 451384084a31SMat Martineau append_skb_frag(chan->sdu, skb, 451484084a31SMat Martineau &chan->sdu_last_frag); 451584084a31SMat Martineau skb = NULL; 45160a708f8fSGustavo F. Padovan 451784084a31SMat Martineau if (chan->sdu->len >= chan->sdu_len) 451884084a31SMat Martineau break; 45190a708f8fSGustavo F. Padovan 452084084a31SMat Martineau err = 0; 45210a708f8fSGustavo F. Padovan break; 45220a708f8fSGustavo F. Padovan 45237e0ef6eeSAndrei Emeltchenko case L2CAP_SAR_END: 45246f61fd47SGustavo F. Padovan if (!chan->sdu) 452584084a31SMat Martineau break; 45260a708f8fSGustavo F. Padovan 452784084a31SMat Martineau append_skb_frag(chan->sdu, skb, 452884084a31SMat Martineau &chan->sdu_last_frag); 452984084a31SMat Martineau skb = NULL; 45300a708f8fSGustavo F. Padovan 453184084a31SMat Martineau if (chan->sdu->len != chan->sdu_len) 453284084a31SMat Martineau break; 45330a708f8fSGustavo F. Padovan 453480b98027SGustavo Padovan err = chan->ops->recv(chan, chan->sdu); 45350a708f8fSGustavo F. Padovan 453684084a31SMat Martineau if (!err) { 453784084a31SMat Martineau /* Reassembly complete */ 453884084a31SMat Martineau chan->sdu = NULL; 453984084a31SMat Martineau chan->sdu_last_frag = NULL; 454084084a31SMat Martineau chan->sdu_len = 0; 45410a708f8fSGustavo F. Padovan } 45420a708f8fSGustavo F. Padovan break; 45430a708f8fSGustavo F. Padovan } 45440a708f8fSGustavo F. Padovan 454584084a31SMat Martineau if (err) { 45460a708f8fSGustavo F. Padovan kfree_skb(skb); 45476f61fd47SGustavo F. Padovan kfree_skb(chan->sdu); 45486f61fd47SGustavo F. Padovan chan->sdu = NULL; 454984084a31SMat Martineau chan->sdu_last_frag = NULL; 455084084a31SMat Martineau chan->sdu_len = 0; 455184084a31SMat Martineau } 45520a708f8fSGustavo F. Padovan 455384084a31SMat Martineau return err; 45540a708f8fSGustavo F. Padovan } 45550a708f8fSGustavo F. Padovan 4556e328140fSMat Martineau void l2cap_chan_busy(struct l2cap_chan *chan, int busy) 45570a708f8fSGustavo F. Padovan { 455861aa4f5bSMat Martineau u8 event; 455961aa4f5bSMat Martineau 456061aa4f5bSMat Martineau if (chan->mode != L2CAP_MODE_ERTM) 456161aa4f5bSMat Martineau return; 456261aa4f5bSMat Martineau 456361aa4f5bSMat Martineau event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR; 4564401bb1f7SAndrei Emeltchenko l2cap_tx(chan, NULL, NULL, event); 45650a708f8fSGustavo F. Padovan } 45660a708f8fSGustavo F. Padovan 4567d2a7ac5dSMat Martineau static int l2cap_rx_queued_iframes(struct l2cap_chan *chan) 4568d2a7ac5dSMat Martineau { 456963838725SMat Martineau int err = 0; 457063838725SMat Martineau /* Pass sequential frames to l2cap_reassemble_sdu() 457163838725SMat Martineau * until a gap is encountered. 457263838725SMat Martineau */ 457363838725SMat Martineau 457463838725SMat Martineau BT_DBG("chan %p", chan); 457563838725SMat Martineau 457663838725SMat Martineau while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { 457763838725SMat Martineau struct sk_buff *skb; 457863838725SMat Martineau BT_DBG("Searching for skb with txseq %d (queue len %d)", 457963838725SMat Martineau chan->buffer_seq, skb_queue_len(&chan->srej_q)); 458063838725SMat Martineau 458163838725SMat Martineau skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq); 458263838725SMat Martineau 458363838725SMat Martineau if (!skb) 458463838725SMat Martineau break; 458563838725SMat Martineau 458663838725SMat Martineau skb_unlink(skb, &chan->srej_q); 458763838725SMat Martineau chan->buffer_seq = __next_seq(chan, chan->buffer_seq); 458863838725SMat Martineau err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->control); 458963838725SMat Martineau if (err) 459063838725SMat Martineau break; 459163838725SMat Martineau } 459263838725SMat Martineau 459363838725SMat Martineau if (skb_queue_empty(&chan->srej_q)) { 459463838725SMat Martineau chan->rx_state = L2CAP_RX_STATE_RECV; 459563838725SMat Martineau l2cap_send_ack(chan); 459663838725SMat Martineau } 459763838725SMat Martineau 459863838725SMat Martineau return err; 4599d2a7ac5dSMat Martineau } 4600d2a7ac5dSMat Martineau 4601d2a7ac5dSMat Martineau static void l2cap_handle_srej(struct l2cap_chan *chan, 4602d2a7ac5dSMat Martineau struct l2cap_ctrl *control) 4603d2a7ac5dSMat Martineau { 4604f80842a8SMat Martineau struct sk_buff *skb; 4605f80842a8SMat Martineau 4606f80842a8SMat Martineau BT_DBG("chan %p, control %p", chan, control); 4607f80842a8SMat Martineau 4608f80842a8SMat Martineau if (control->reqseq == chan->next_tx_seq) { 4609f80842a8SMat Martineau BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); 4610f80842a8SMat Martineau l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); 4611f80842a8SMat Martineau return; 4612f80842a8SMat Martineau } 4613f80842a8SMat Martineau 4614f80842a8SMat Martineau skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); 4615f80842a8SMat Martineau 4616f80842a8SMat Martineau if (skb == NULL) { 4617f80842a8SMat Martineau BT_DBG("Seq %d not available for retransmission", 4618f80842a8SMat Martineau control->reqseq); 4619f80842a8SMat Martineau return; 4620f80842a8SMat Martineau } 4621f80842a8SMat Martineau 4622f80842a8SMat Martineau if (chan->max_tx != 0 && bt_cb(skb)->control.retries >= chan->max_tx) { 4623f80842a8SMat Martineau BT_DBG("Retry limit exceeded (%d)", chan->max_tx); 4624f80842a8SMat Martineau l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); 4625f80842a8SMat Martineau return; 4626f80842a8SMat Martineau } 4627f80842a8SMat Martineau 4628f80842a8SMat Martineau clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); 4629f80842a8SMat Martineau 4630f80842a8SMat Martineau if (control->poll) { 4631f80842a8SMat Martineau l2cap_pass_to_tx(chan, control); 4632f80842a8SMat Martineau 4633f80842a8SMat Martineau set_bit(CONN_SEND_FBIT, &chan->conn_state); 4634f80842a8SMat Martineau l2cap_retransmit(chan, control); 4635f80842a8SMat Martineau l2cap_ertm_send(chan); 4636f80842a8SMat Martineau 4637f80842a8SMat Martineau if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { 4638f80842a8SMat Martineau set_bit(CONN_SREJ_ACT, &chan->conn_state); 4639f80842a8SMat Martineau chan->srej_save_reqseq = control->reqseq; 4640f80842a8SMat Martineau } 4641f80842a8SMat Martineau } else { 4642f80842a8SMat Martineau l2cap_pass_to_tx_fbit(chan, control); 4643f80842a8SMat Martineau 4644f80842a8SMat Martineau if (control->final) { 4645f80842a8SMat Martineau if (chan->srej_save_reqseq != control->reqseq || 4646f80842a8SMat Martineau !test_and_clear_bit(CONN_SREJ_ACT, 4647f80842a8SMat Martineau &chan->conn_state)) 4648f80842a8SMat Martineau l2cap_retransmit(chan, control); 4649f80842a8SMat Martineau } else { 4650f80842a8SMat Martineau l2cap_retransmit(chan, control); 4651f80842a8SMat Martineau if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { 4652f80842a8SMat Martineau set_bit(CONN_SREJ_ACT, &chan->conn_state); 4653f80842a8SMat Martineau chan->srej_save_reqseq = control->reqseq; 4654f80842a8SMat Martineau } 4655f80842a8SMat Martineau } 4656f80842a8SMat Martineau } 4657d2a7ac5dSMat Martineau } 4658d2a7ac5dSMat Martineau 4659d2a7ac5dSMat Martineau static void l2cap_handle_rej(struct l2cap_chan *chan, 4660d2a7ac5dSMat Martineau struct l2cap_ctrl *control) 4661d2a7ac5dSMat Martineau { 4662fcd289dfSMat Martineau struct sk_buff *skb; 4663fcd289dfSMat Martineau 4664fcd289dfSMat Martineau BT_DBG("chan %p, control %p", chan, control); 4665fcd289dfSMat Martineau 4666fcd289dfSMat Martineau if (control->reqseq == chan->next_tx_seq) { 4667fcd289dfSMat Martineau BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); 4668fcd289dfSMat Martineau l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); 4669fcd289dfSMat Martineau return; 4670fcd289dfSMat Martineau } 4671fcd289dfSMat Martineau 4672fcd289dfSMat Martineau skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); 4673fcd289dfSMat Martineau 4674fcd289dfSMat Martineau if (chan->max_tx && skb && 4675fcd289dfSMat Martineau bt_cb(skb)->control.retries >= chan->max_tx) { 4676fcd289dfSMat Martineau BT_DBG("Retry limit exceeded (%d)", chan->max_tx); 4677fcd289dfSMat Martineau l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); 4678fcd289dfSMat Martineau return; 4679fcd289dfSMat Martineau } 4680fcd289dfSMat Martineau 4681fcd289dfSMat Martineau clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); 4682fcd289dfSMat Martineau 4683fcd289dfSMat Martineau l2cap_pass_to_tx(chan, control); 4684fcd289dfSMat Martineau 4685fcd289dfSMat Martineau if (control->final) { 4686fcd289dfSMat Martineau if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) 4687fcd289dfSMat Martineau l2cap_retransmit_all(chan, control); 4688fcd289dfSMat Martineau } else { 4689fcd289dfSMat Martineau l2cap_retransmit_all(chan, control); 4690fcd289dfSMat Martineau l2cap_ertm_send(chan); 4691fcd289dfSMat Martineau if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) 4692fcd289dfSMat Martineau set_bit(CONN_REJ_ACT, &chan->conn_state); 4693fcd289dfSMat Martineau } 4694d2a7ac5dSMat Martineau } 4695d2a7ac5dSMat Martineau 46964b51dae9SMat Martineau static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq) 46974b51dae9SMat Martineau { 46984b51dae9SMat Martineau BT_DBG("chan %p, txseq %d", chan, txseq); 46994b51dae9SMat Martineau 47004b51dae9SMat Martineau BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq, 47014b51dae9SMat Martineau chan->expected_tx_seq); 47024b51dae9SMat Martineau 47034b51dae9SMat Martineau if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { 47044b51dae9SMat Martineau if (__seq_offset(chan, txseq, chan->last_acked_seq) >= 47054b51dae9SMat Martineau chan->tx_win) { 47064b51dae9SMat Martineau /* See notes below regarding "double poll" and 47074b51dae9SMat Martineau * invalid packets. 47084b51dae9SMat Martineau */ 47094b51dae9SMat Martineau if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { 47104b51dae9SMat Martineau BT_DBG("Invalid/Ignore - after SREJ"); 47114b51dae9SMat Martineau return L2CAP_TXSEQ_INVALID_IGNORE; 47124b51dae9SMat Martineau } else { 47134b51dae9SMat Martineau BT_DBG("Invalid - in window after SREJ sent"); 47144b51dae9SMat Martineau return L2CAP_TXSEQ_INVALID; 47154b51dae9SMat Martineau } 47164b51dae9SMat Martineau } 47174b51dae9SMat Martineau 47184b51dae9SMat Martineau if (chan->srej_list.head == txseq) { 47194b51dae9SMat Martineau BT_DBG("Expected SREJ"); 47204b51dae9SMat Martineau return L2CAP_TXSEQ_EXPECTED_SREJ; 47214b51dae9SMat Martineau } 47224b51dae9SMat Martineau 47234b51dae9SMat Martineau if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) { 47244b51dae9SMat Martineau BT_DBG("Duplicate SREJ - txseq already stored"); 47254b51dae9SMat Martineau return L2CAP_TXSEQ_DUPLICATE_SREJ; 47264b51dae9SMat Martineau } 47274b51dae9SMat Martineau 47284b51dae9SMat Martineau if (l2cap_seq_list_contains(&chan->srej_list, txseq)) { 47294b51dae9SMat Martineau BT_DBG("Unexpected SREJ - not requested"); 47304b51dae9SMat Martineau return L2CAP_TXSEQ_UNEXPECTED_SREJ; 47314b51dae9SMat Martineau } 47324b51dae9SMat Martineau } 47334b51dae9SMat Martineau 47344b51dae9SMat Martineau if (chan->expected_tx_seq == txseq) { 47354b51dae9SMat Martineau if (__seq_offset(chan, txseq, chan->last_acked_seq) >= 47364b51dae9SMat Martineau chan->tx_win) { 47374b51dae9SMat Martineau BT_DBG("Invalid - txseq outside tx window"); 47384b51dae9SMat Martineau return L2CAP_TXSEQ_INVALID; 47394b51dae9SMat Martineau } else { 47404b51dae9SMat Martineau BT_DBG("Expected"); 47414b51dae9SMat Martineau return L2CAP_TXSEQ_EXPECTED; 47424b51dae9SMat Martineau } 47434b51dae9SMat Martineau } 47444b51dae9SMat Martineau 47454b51dae9SMat Martineau if (__seq_offset(chan, txseq, chan->last_acked_seq) < 47462d792818SGustavo Padovan __seq_offset(chan, chan->expected_tx_seq, chan->last_acked_seq)) { 47474b51dae9SMat Martineau BT_DBG("Duplicate - expected_tx_seq later than txseq"); 47484b51dae9SMat Martineau return L2CAP_TXSEQ_DUPLICATE; 47494b51dae9SMat Martineau } 47504b51dae9SMat Martineau 47514b51dae9SMat Martineau if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) { 47524b51dae9SMat Martineau /* A source of invalid packets is a "double poll" condition, 47534b51dae9SMat Martineau * where delays cause us to send multiple poll packets. If 47544b51dae9SMat Martineau * the remote stack receives and processes both polls, 47554b51dae9SMat Martineau * sequence numbers can wrap around in such a way that a 47564b51dae9SMat Martineau * resent frame has a sequence number that looks like new data 47574b51dae9SMat Martineau * with a sequence gap. This would trigger an erroneous SREJ 47584b51dae9SMat Martineau * request. 47594b51dae9SMat Martineau * 47604b51dae9SMat Martineau * Fortunately, this is impossible with a tx window that's 47614b51dae9SMat Martineau * less than half of the maximum sequence number, which allows 47624b51dae9SMat Martineau * invalid frames to be safely ignored. 47634b51dae9SMat Martineau * 47644b51dae9SMat Martineau * With tx window sizes greater than half of the tx window 47654b51dae9SMat Martineau * maximum, the frame is invalid and cannot be ignored. This 47664b51dae9SMat Martineau * causes a disconnect. 47674b51dae9SMat Martineau */ 47684b51dae9SMat Martineau 47694b51dae9SMat Martineau if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { 47704b51dae9SMat Martineau BT_DBG("Invalid/Ignore - txseq outside tx window"); 47714b51dae9SMat Martineau return L2CAP_TXSEQ_INVALID_IGNORE; 47724b51dae9SMat Martineau } else { 47734b51dae9SMat Martineau BT_DBG("Invalid - txseq outside tx window"); 47744b51dae9SMat Martineau return L2CAP_TXSEQ_INVALID; 47754b51dae9SMat Martineau } 47764b51dae9SMat Martineau } else { 47774b51dae9SMat Martineau BT_DBG("Unexpected - txseq indicates missing frames"); 47784b51dae9SMat Martineau return L2CAP_TXSEQ_UNEXPECTED; 47794b51dae9SMat Martineau } 47804b51dae9SMat Martineau } 47814b51dae9SMat Martineau 4782d2a7ac5dSMat Martineau static int l2cap_rx_state_recv(struct l2cap_chan *chan, 4783d2a7ac5dSMat Martineau struct l2cap_ctrl *control, 4784d2a7ac5dSMat Martineau struct sk_buff *skb, u8 event) 4785d2a7ac5dSMat Martineau { 4786d2a7ac5dSMat Martineau int err = 0; 4787d2a7ac5dSMat Martineau bool skb_in_use = 0; 4788d2a7ac5dSMat Martineau 4789d2a7ac5dSMat Martineau BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, 4790d2a7ac5dSMat Martineau event); 4791d2a7ac5dSMat Martineau 4792d2a7ac5dSMat Martineau switch (event) { 4793d2a7ac5dSMat Martineau case L2CAP_EV_RECV_IFRAME: 4794d2a7ac5dSMat Martineau switch (l2cap_classify_txseq(chan, control->txseq)) { 4795d2a7ac5dSMat Martineau case L2CAP_TXSEQ_EXPECTED: 4796d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 4797d2a7ac5dSMat Martineau 4798d2a7ac5dSMat Martineau if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { 4799d2a7ac5dSMat Martineau BT_DBG("Busy, discarding expected seq %d", 4800d2a7ac5dSMat Martineau control->txseq); 4801d2a7ac5dSMat Martineau break; 4802d2a7ac5dSMat Martineau } 4803d2a7ac5dSMat Martineau 4804d2a7ac5dSMat Martineau chan->expected_tx_seq = __next_seq(chan, 4805d2a7ac5dSMat Martineau control->txseq); 4806d2a7ac5dSMat Martineau 4807d2a7ac5dSMat Martineau chan->buffer_seq = chan->expected_tx_seq; 4808d2a7ac5dSMat Martineau skb_in_use = 1; 4809d2a7ac5dSMat Martineau 4810d2a7ac5dSMat Martineau err = l2cap_reassemble_sdu(chan, skb, control); 4811d2a7ac5dSMat Martineau if (err) 4812d2a7ac5dSMat Martineau break; 4813d2a7ac5dSMat Martineau 4814d2a7ac5dSMat Martineau if (control->final) { 4815d2a7ac5dSMat Martineau if (!test_and_clear_bit(CONN_REJ_ACT, 4816d2a7ac5dSMat Martineau &chan->conn_state)) { 4817d2a7ac5dSMat Martineau control->final = 0; 4818d2a7ac5dSMat Martineau l2cap_retransmit_all(chan, control); 4819d2a7ac5dSMat Martineau l2cap_ertm_send(chan); 4820d2a7ac5dSMat Martineau } 4821d2a7ac5dSMat Martineau } 4822d2a7ac5dSMat Martineau 4823d2a7ac5dSMat Martineau if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) 4824d2a7ac5dSMat Martineau l2cap_send_ack(chan); 4825d2a7ac5dSMat Martineau break; 4826d2a7ac5dSMat Martineau case L2CAP_TXSEQ_UNEXPECTED: 4827d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 4828d2a7ac5dSMat Martineau 4829d2a7ac5dSMat Martineau /* Can't issue SREJ frames in the local busy state. 4830d2a7ac5dSMat Martineau * Drop this frame, it will be seen as missing 4831d2a7ac5dSMat Martineau * when local busy is exited. 4832d2a7ac5dSMat Martineau */ 4833d2a7ac5dSMat Martineau if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { 4834d2a7ac5dSMat Martineau BT_DBG("Busy, discarding unexpected seq %d", 4835d2a7ac5dSMat Martineau control->txseq); 4836d2a7ac5dSMat Martineau break; 4837d2a7ac5dSMat Martineau } 4838d2a7ac5dSMat Martineau 4839d2a7ac5dSMat Martineau /* There was a gap in the sequence, so an SREJ 4840d2a7ac5dSMat Martineau * must be sent for each missing frame. The 4841d2a7ac5dSMat Martineau * current frame is stored for later use. 4842d2a7ac5dSMat Martineau */ 4843d2a7ac5dSMat Martineau skb_queue_tail(&chan->srej_q, skb); 4844d2a7ac5dSMat Martineau skb_in_use = 1; 4845d2a7ac5dSMat Martineau BT_DBG("Queued %p (queue len %d)", skb, 4846d2a7ac5dSMat Martineau skb_queue_len(&chan->srej_q)); 4847d2a7ac5dSMat Martineau 4848d2a7ac5dSMat Martineau clear_bit(CONN_SREJ_ACT, &chan->conn_state); 4849d2a7ac5dSMat Martineau l2cap_seq_list_clear(&chan->srej_list); 4850d2a7ac5dSMat Martineau l2cap_send_srej(chan, control->txseq); 4851d2a7ac5dSMat Martineau 4852d2a7ac5dSMat Martineau chan->rx_state = L2CAP_RX_STATE_SREJ_SENT; 4853d2a7ac5dSMat Martineau break; 4854d2a7ac5dSMat Martineau case L2CAP_TXSEQ_DUPLICATE: 4855d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 4856d2a7ac5dSMat Martineau break; 4857d2a7ac5dSMat Martineau case L2CAP_TXSEQ_INVALID_IGNORE: 4858d2a7ac5dSMat Martineau break; 4859d2a7ac5dSMat Martineau case L2CAP_TXSEQ_INVALID: 4860d2a7ac5dSMat Martineau default: 4861d2a7ac5dSMat Martineau l2cap_send_disconn_req(chan->conn, chan, 4862d2a7ac5dSMat Martineau ECONNRESET); 4863d2a7ac5dSMat Martineau break; 4864d2a7ac5dSMat Martineau } 4865d2a7ac5dSMat Martineau break; 4866d2a7ac5dSMat Martineau case L2CAP_EV_RECV_RR: 4867d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 4868d2a7ac5dSMat Martineau if (control->final) { 4869d2a7ac5dSMat Martineau clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); 4870d2a7ac5dSMat Martineau 4871d2a7ac5dSMat Martineau if (!test_and_clear_bit(CONN_REJ_ACT, 4872d2a7ac5dSMat Martineau &chan->conn_state)) { 4873d2a7ac5dSMat Martineau control->final = 0; 4874d2a7ac5dSMat Martineau l2cap_retransmit_all(chan, control); 4875d2a7ac5dSMat Martineau } 4876d2a7ac5dSMat Martineau 4877d2a7ac5dSMat Martineau l2cap_ertm_send(chan); 4878d2a7ac5dSMat Martineau } else if (control->poll) { 4879d2a7ac5dSMat Martineau l2cap_send_i_or_rr_or_rnr(chan); 4880d2a7ac5dSMat Martineau } else { 4881d2a7ac5dSMat Martineau if (test_and_clear_bit(CONN_REMOTE_BUSY, 4882d2a7ac5dSMat Martineau &chan->conn_state) && 4883d2a7ac5dSMat Martineau chan->unacked_frames) 4884d2a7ac5dSMat Martineau __set_retrans_timer(chan); 4885d2a7ac5dSMat Martineau 4886d2a7ac5dSMat Martineau l2cap_ertm_send(chan); 4887d2a7ac5dSMat Martineau } 4888d2a7ac5dSMat Martineau break; 4889d2a7ac5dSMat Martineau case L2CAP_EV_RECV_RNR: 4890d2a7ac5dSMat Martineau set_bit(CONN_REMOTE_BUSY, &chan->conn_state); 4891d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 4892d2a7ac5dSMat Martineau if (control && control->poll) { 4893d2a7ac5dSMat Martineau set_bit(CONN_SEND_FBIT, &chan->conn_state); 4894d2a7ac5dSMat Martineau l2cap_send_rr_or_rnr(chan, 0); 4895d2a7ac5dSMat Martineau } 4896d2a7ac5dSMat Martineau __clear_retrans_timer(chan); 4897d2a7ac5dSMat Martineau l2cap_seq_list_clear(&chan->retrans_list); 4898d2a7ac5dSMat Martineau break; 4899d2a7ac5dSMat Martineau case L2CAP_EV_RECV_REJ: 4900d2a7ac5dSMat Martineau l2cap_handle_rej(chan, control); 4901d2a7ac5dSMat Martineau break; 4902d2a7ac5dSMat Martineau case L2CAP_EV_RECV_SREJ: 4903d2a7ac5dSMat Martineau l2cap_handle_srej(chan, control); 4904d2a7ac5dSMat Martineau break; 4905d2a7ac5dSMat Martineau default: 4906d2a7ac5dSMat Martineau break; 4907d2a7ac5dSMat Martineau } 4908d2a7ac5dSMat Martineau 4909d2a7ac5dSMat Martineau if (skb && !skb_in_use) { 4910d2a7ac5dSMat Martineau BT_DBG("Freeing %p", skb); 4911d2a7ac5dSMat Martineau kfree_skb(skb); 4912d2a7ac5dSMat Martineau } 4913d2a7ac5dSMat Martineau 4914d2a7ac5dSMat Martineau return err; 4915d2a7ac5dSMat Martineau } 4916d2a7ac5dSMat Martineau 4917d2a7ac5dSMat Martineau static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan, 4918d2a7ac5dSMat Martineau struct l2cap_ctrl *control, 4919d2a7ac5dSMat Martineau struct sk_buff *skb, u8 event) 4920d2a7ac5dSMat Martineau { 4921d2a7ac5dSMat Martineau int err = 0; 4922d2a7ac5dSMat Martineau u16 txseq = control->txseq; 4923d2a7ac5dSMat Martineau bool skb_in_use = 0; 4924d2a7ac5dSMat Martineau 4925d2a7ac5dSMat Martineau BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, 4926d2a7ac5dSMat Martineau event); 4927d2a7ac5dSMat Martineau 4928d2a7ac5dSMat Martineau switch (event) { 4929d2a7ac5dSMat Martineau case L2CAP_EV_RECV_IFRAME: 4930d2a7ac5dSMat Martineau switch (l2cap_classify_txseq(chan, txseq)) { 4931d2a7ac5dSMat Martineau case L2CAP_TXSEQ_EXPECTED: 4932d2a7ac5dSMat Martineau /* Keep frame for reassembly later */ 4933d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 4934d2a7ac5dSMat Martineau skb_queue_tail(&chan->srej_q, skb); 4935d2a7ac5dSMat Martineau skb_in_use = 1; 4936d2a7ac5dSMat Martineau BT_DBG("Queued %p (queue len %d)", skb, 4937d2a7ac5dSMat Martineau skb_queue_len(&chan->srej_q)); 4938d2a7ac5dSMat Martineau 4939d2a7ac5dSMat Martineau chan->expected_tx_seq = __next_seq(chan, txseq); 4940d2a7ac5dSMat Martineau break; 4941d2a7ac5dSMat Martineau case L2CAP_TXSEQ_EXPECTED_SREJ: 4942d2a7ac5dSMat Martineau l2cap_seq_list_pop(&chan->srej_list); 4943d2a7ac5dSMat Martineau 4944d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 4945d2a7ac5dSMat Martineau skb_queue_tail(&chan->srej_q, skb); 4946d2a7ac5dSMat Martineau skb_in_use = 1; 4947d2a7ac5dSMat Martineau BT_DBG("Queued %p (queue len %d)", skb, 4948d2a7ac5dSMat Martineau skb_queue_len(&chan->srej_q)); 4949d2a7ac5dSMat Martineau 4950d2a7ac5dSMat Martineau err = l2cap_rx_queued_iframes(chan); 4951d2a7ac5dSMat Martineau if (err) 4952d2a7ac5dSMat Martineau break; 4953d2a7ac5dSMat Martineau 4954d2a7ac5dSMat Martineau break; 4955d2a7ac5dSMat Martineau case L2CAP_TXSEQ_UNEXPECTED: 4956d2a7ac5dSMat Martineau /* Got a frame that can't be reassembled yet. 4957d2a7ac5dSMat Martineau * Save it for later, and send SREJs to cover 4958d2a7ac5dSMat Martineau * the missing frames. 4959d2a7ac5dSMat Martineau */ 4960d2a7ac5dSMat Martineau skb_queue_tail(&chan->srej_q, skb); 4961d2a7ac5dSMat Martineau skb_in_use = 1; 4962d2a7ac5dSMat Martineau BT_DBG("Queued %p (queue len %d)", skb, 4963d2a7ac5dSMat Martineau skb_queue_len(&chan->srej_q)); 4964d2a7ac5dSMat Martineau 4965d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 4966d2a7ac5dSMat Martineau l2cap_send_srej(chan, control->txseq); 4967d2a7ac5dSMat Martineau break; 4968d2a7ac5dSMat Martineau case L2CAP_TXSEQ_UNEXPECTED_SREJ: 4969d2a7ac5dSMat Martineau /* This frame was requested with an SREJ, but 4970d2a7ac5dSMat Martineau * some expected retransmitted frames are 4971d2a7ac5dSMat Martineau * missing. Request retransmission of missing 4972d2a7ac5dSMat Martineau * SREJ'd frames. 4973d2a7ac5dSMat Martineau */ 4974d2a7ac5dSMat Martineau skb_queue_tail(&chan->srej_q, skb); 4975d2a7ac5dSMat Martineau skb_in_use = 1; 4976d2a7ac5dSMat Martineau BT_DBG("Queued %p (queue len %d)", skb, 4977d2a7ac5dSMat Martineau skb_queue_len(&chan->srej_q)); 4978d2a7ac5dSMat Martineau 4979d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 4980d2a7ac5dSMat Martineau l2cap_send_srej_list(chan, control->txseq); 4981d2a7ac5dSMat Martineau break; 4982d2a7ac5dSMat Martineau case L2CAP_TXSEQ_DUPLICATE_SREJ: 4983d2a7ac5dSMat Martineau /* We've already queued this frame. Drop this copy. */ 4984d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 4985d2a7ac5dSMat Martineau break; 4986d2a7ac5dSMat Martineau case L2CAP_TXSEQ_DUPLICATE: 4987d2a7ac5dSMat Martineau /* Expecting a later sequence number, so this frame 4988d2a7ac5dSMat Martineau * was already received. Ignore it completely. 4989d2a7ac5dSMat Martineau */ 4990d2a7ac5dSMat Martineau break; 4991d2a7ac5dSMat Martineau case L2CAP_TXSEQ_INVALID_IGNORE: 4992d2a7ac5dSMat Martineau break; 4993d2a7ac5dSMat Martineau case L2CAP_TXSEQ_INVALID: 4994d2a7ac5dSMat Martineau default: 4995d2a7ac5dSMat Martineau l2cap_send_disconn_req(chan->conn, chan, 4996d2a7ac5dSMat Martineau ECONNRESET); 4997d2a7ac5dSMat Martineau break; 4998d2a7ac5dSMat Martineau } 4999d2a7ac5dSMat Martineau break; 5000d2a7ac5dSMat Martineau case L2CAP_EV_RECV_RR: 5001d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 5002d2a7ac5dSMat Martineau if (control->final) { 5003d2a7ac5dSMat Martineau clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); 5004d2a7ac5dSMat Martineau 5005d2a7ac5dSMat Martineau if (!test_and_clear_bit(CONN_REJ_ACT, 5006d2a7ac5dSMat Martineau &chan->conn_state)) { 5007d2a7ac5dSMat Martineau control->final = 0; 5008d2a7ac5dSMat Martineau l2cap_retransmit_all(chan, control); 5009d2a7ac5dSMat Martineau } 5010d2a7ac5dSMat Martineau 5011d2a7ac5dSMat Martineau l2cap_ertm_send(chan); 5012d2a7ac5dSMat Martineau } else if (control->poll) { 5013d2a7ac5dSMat Martineau if (test_and_clear_bit(CONN_REMOTE_BUSY, 5014d2a7ac5dSMat Martineau &chan->conn_state) && 5015d2a7ac5dSMat Martineau chan->unacked_frames) { 5016d2a7ac5dSMat Martineau __set_retrans_timer(chan); 5017d2a7ac5dSMat Martineau } 5018d2a7ac5dSMat Martineau 5019d2a7ac5dSMat Martineau set_bit(CONN_SEND_FBIT, &chan->conn_state); 5020d2a7ac5dSMat Martineau l2cap_send_srej_tail(chan); 5021d2a7ac5dSMat Martineau } else { 5022d2a7ac5dSMat Martineau if (test_and_clear_bit(CONN_REMOTE_BUSY, 5023d2a7ac5dSMat Martineau &chan->conn_state) && 5024d2a7ac5dSMat Martineau chan->unacked_frames) 5025d2a7ac5dSMat Martineau __set_retrans_timer(chan); 5026d2a7ac5dSMat Martineau 5027d2a7ac5dSMat Martineau l2cap_send_ack(chan); 5028d2a7ac5dSMat Martineau } 5029d2a7ac5dSMat Martineau break; 5030d2a7ac5dSMat Martineau case L2CAP_EV_RECV_RNR: 5031d2a7ac5dSMat Martineau set_bit(CONN_REMOTE_BUSY, &chan->conn_state); 5032d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 5033d2a7ac5dSMat Martineau if (control->poll) { 5034d2a7ac5dSMat Martineau l2cap_send_srej_tail(chan); 5035d2a7ac5dSMat Martineau } else { 5036d2a7ac5dSMat Martineau struct l2cap_ctrl rr_control; 5037d2a7ac5dSMat Martineau memset(&rr_control, 0, sizeof(rr_control)); 5038d2a7ac5dSMat Martineau rr_control.sframe = 1; 5039d2a7ac5dSMat Martineau rr_control.super = L2CAP_SUPER_RR; 5040d2a7ac5dSMat Martineau rr_control.reqseq = chan->buffer_seq; 5041d2a7ac5dSMat Martineau l2cap_send_sframe(chan, &rr_control); 5042d2a7ac5dSMat Martineau } 5043d2a7ac5dSMat Martineau 5044d2a7ac5dSMat Martineau break; 5045d2a7ac5dSMat Martineau case L2CAP_EV_RECV_REJ: 5046d2a7ac5dSMat Martineau l2cap_handle_rej(chan, control); 5047d2a7ac5dSMat Martineau break; 5048d2a7ac5dSMat Martineau case L2CAP_EV_RECV_SREJ: 5049d2a7ac5dSMat Martineau l2cap_handle_srej(chan, control); 5050d2a7ac5dSMat Martineau break; 5051d2a7ac5dSMat Martineau } 5052d2a7ac5dSMat Martineau 5053d2a7ac5dSMat Martineau if (skb && !skb_in_use) { 5054d2a7ac5dSMat Martineau BT_DBG("Freeing %p", skb); 5055d2a7ac5dSMat Martineau kfree_skb(skb); 5056d2a7ac5dSMat Martineau } 5057d2a7ac5dSMat Martineau 5058d2a7ac5dSMat Martineau return err; 5059d2a7ac5dSMat Martineau } 5060d2a7ac5dSMat Martineau 5061d2a7ac5dSMat Martineau static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq) 5062d2a7ac5dSMat Martineau { 5063d2a7ac5dSMat Martineau /* Make sure reqseq is for a packet that has been sent but not acked */ 5064d2a7ac5dSMat Martineau u16 unacked; 5065d2a7ac5dSMat Martineau 5066d2a7ac5dSMat Martineau unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq); 5067d2a7ac5dSMat Martineau return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked; 5068d2a7ac5dSMat Martineau } 5069d2a7ac5dSMat Martineau 5070cec8ab6eSMat Martineau static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, 5071cec8ab6eSMat Martineau struct sk_buff *skb, u8 event) 50720a708f8fSGustavo F. Padovan { 5073d2a7ac5dSMat Martineau int err = 0; 5074d2a7ac5dSMat Martineau 5075d2a7ac5dSMat Martineau BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan, 5076d2a7ac5dSMat Martineau control, skb, event, chan->rx_state); 5077d2a7ac5dSMat Martineau 5078d2a7ac5dSMat Martineau if (__valid_reqseq(chan, control->reqseq)) { 5079d2a7ac5dSMat Martineau switch (chan->rx_state) { 5080d2a7ac5dSMat Martineau case L2CAP_RX_STATE_RECV: 5081d2a7ac5dSMat Martineau err = l2cap_rx_state_recv(chan, control, skb, event); 5082d2a7ac5dSMat Martineau break; 5083d2a7ac5dSMat Martineau case L2CAP_RX_STATE_SREJ_SENT: 5084d2a7ac5dSMat Martineau err = l2cap_rx_state_srej_sent(chan, control, skb, 5085d2a7ac5dSMat Martineau event); 5086d2a7ac5dSMat Martineau break; 5087d2a7ac5dSMat Martineau default: 5088d2a7ac5dSMat Martineau /* shut it down */ 5089d2a7ac5dSMat Martineau break; 5090d2a7ac5dSMat Martineau } 5091d2a7ac5dSMat Martineau } else { 5092d2a7ac5dSMat Martineau BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d", 5093d2a7ac5dSMat Martineau control->reqseq, chan->next_tx_seq, 5094d2a7ac5dSMat Martineau chan->expected_ack_seq); 5095d2a7ac5dSMat Martineau l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); 5096d2a7ac5dSMat Martineau } 5097d2a7ac5dSMat Martineau 5098d2a7ac5dSMat Martineau return err; 5099cec8ab6eSMat Martineau } 5100cec8ab6eSMat Martineau 5101cec8ab6eSMat Martineau static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, 5102cec8ab6eSMat Martineau struct sk_buff *skb) 5103cec8ab6eSMat Martineau { 51044b51dae9SMat Martineau int err = 0; 51054b51dae9SMat Martineau 51064b51dae9SMat Martineau BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb, 51074b51dae9SMat Martineau chan->rx_state); 51084b51dae9SMat Martineau 51094b51dae9SMat Martineau if (l2cap_classify_txseq(chan, control->txseq) == 51104b51dae9SMat Martineau L2CAP_TXSEQ_EXPECTED) { 51114b51dae9SMat Martineau l2cap_pass_to_tx(chan, control); 51124b51dae9SMat Martineau 51134b51dae9SMat Martineau BT_DBG("buffer_seq %d->%d", chan->buffer_seq, 51144b51dae9SMat Martineau __next_seq(chan, chan->buffer_seq)); 51154b51dae9SMat Martineau 51164b51dae9SMat Martineau chan->buffer_seq = __next_seq(chan, chan->buffer_seq); 51174b51dae9SMat Martineau 51184b51dae9SMat Martineau l2cap_reassemble_sdu(chan, skb, control); 51194b51dae9SMat Martineau } else { 51204b51dae9SMat Martineau if (chan->sdu) { 51214b51dae9SMat Martineau kfree_skb(chan->sdu); 51224b51dae9SMat Martineau chan->sdu = NULL; 51234b51dae9SMat Martineau } 51244b51dae9SMat Martineau chan->sdu_last_frag = NULL; 51254b51dae9SMat Martineau chan->sdu_len = 0; 51264b51dae9SMat Martineau 51274b51dae9SMat Martineau if (skb) { 51284b51dae9SMat Martineau BT_DBG("Freeing %p", skb); 51294b51dae9SMat Martineau kfree_skb(skb); 51304b51dae9SMat Martineau } 51314b51dae9SMat Martineau } 51324b51dae9SMat Martineau 51334b51dae9SMat Martineau chan->last_acked_seq = control->txseq; 51344b51dae9SMat Martineau chan->expected_tx_seq = __next_seq(chan, control->txseq); 51354b51dae9SMat Martineau 51364b51dae9SMat Martineau return err; 5137cec8ab6eSMat Martineau } 5138cec8ab6eSMat Martineau 5139cec8ab6eSMat Martineau static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) 5140cec8ab6eSMat Martineau { 5141cec8ab6eSMat Martineau struct l2cap_ctrl *control = &bt_cb(skb)->control; 5142cec8ab6eSMat Martineau u16 len; 5143cec8ab6eSMat Martineau u8 event; 51440a708f8fSGustavo F. Padovan 5145b76bbd66SMat Martineau __unpack_control(chan, skb); 5146b76bbd66SMat Martineau 51470a708f8fSGustavo F. Padovan len = skb->len; 51480a708f8fSGustavo F. Padovan 51490a708f8fSGustavo F. Padovan /* 51500a708f8fSGustavo F. Padovan * We can just drop the corrupted I-frame here. 51510a708f8fSGustavo F. Padovan * Receiver will miss it and start proper recovery 5152cec8ab6eSMat Martineau * procedures and ask for retransmission. 51530a708f8fSGustavo F. Padovan */ 515447d1ec61SGustavo F. Padovan if (l2cap_check_fcs(chan, skb)) 51550a708f8fSGustavo F. Padovan goto drop; 51560a708f8fSGustavo F. Padovan 5157cec8ab6eSMat Martineau if (!control->sframe && control->sar == L2CAP_SAR_START) 515803a51213SAndrei Emeltchenko len -= L2CAP_SDULEN_SIZE; 51590a708f8fSGustavo F. Padovan 516047d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) 516103a51213SAndrei Emeltchenko len -= L2CAP_FCS_SIZE; 51620a708f8fSGustavo F. Padovan 516347d1ec61SGustavo F. Padovan if (len > chan->mps) { 51648c1d787bSGustavo F. Padovan l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); 51650a708f8fSGustavo F. Padovan goto drop; 51660a708f8fSGustavo F. Padovan } 51670a708f8fSGustavo F. Padovan 5168cec8ab6eSMat Martineau if (!control->sframe) { 5169cec8ab6eSMat Martineau int err; 51700a708f8fSGustavo F. Padovan 5171cec8ab6eSMat Martineau BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d", 5172cec8ab6eSMat Martineau control->sar, control->reqseq, control->final, 5173cec8ab6eSMat Martineau control->txseq); 5174836be934SAndrei Emeltchenko 5175cec8ab6eSMat Martineau /* Validate F-bit - F=0 always valid, F=1 only 5176cec8ab6eSMat Martineau * valid in TX WAIT_F 5177cec8ab6eSMat Martineau */ 5178cec8ab6eSMat Martineau if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F) 51790a708f8fSGustavo F. Padovan goto drop; 51800a708f8fSGustavo F. Padovan 5181cec8ab6eSMat Martineau if (chan->mode != L2CAP_MODE_STREAMING) { 5182cec8ab6eSMat Martineau event = L2CAP_EV_RECV_IFRAME; 5183cec8ab6eSMat Martineau err = l2cap_rx(chan, control, skb, event); 51840a708f8fSGustavo F. Padovan } else { 5185cec8ab6eSMat Martineau err = l2cap_stream_rx(chan, control, skb); 5186cec8ab6eSMat Martineau } 5187cec8ab6eSMat Martineau 5188cec8ab6eSMat Martineau if (err) 5189cec8ab6eSMat Martineau l2cap_send_disconn_req(chan->conn, chan, 5190cec8ab6eSMat Martineau ECONNRESET); 5191cec8ab6eSMat Martineau } else { 5192cec8ab6eSMat Martineau const u8 rx_func_to_event[4] = { 5193cec8ab6eSMat Martineau L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ, 5194cec8ab6eSMat Martineau L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ 5195cec8ab6eSMat Martineau }; 5196cec8ab6eSMat Martineau 5197cec8ab6eSMat Martineau /* Only I-frames are expected in streaming mode */ 5198cec8ab6eSMat Martineau if (chan->mode == L2CAP_MODE_STREAMING) 5199cec8ab6eSMat Martineau goto drop; 5200cec8ab6eSMat Martineau 5201cec8ab6eSMat Martineau BT_DBG("sframe reqseq %d, final %d, poll %d, super %d", 5202cec8ab6eSMat Martineau control->reqseq, control->final, control->poll, 5203cec8ab6eSMat Martineau control->super); 5204cec8ab6eSMat Martineau 52050a708f8fSGustavo F. Padovan if (len != 0) { 52060a708f8fSGustavo F. Padovan BT_ERR("%d", len); 52078c1d787bSGustavo F. Padovan l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); 52080a708f8fSGustavo F. Padovan goto drop; 52090a708f8fSGustavo F. Padovan } 52100a708f8fSGustavo F. Padovan 5211cec8ab6eSMat Martineau /* Validate F and P bits */ 5212cec8ab6eSMat Martineau if (control->final && (control->poll || 5213cec8ab6eSMat Martineau chan->tx_state != L2CAP_TX_STATE_WAIT_F)) 5214cec8ab6eSMat Martineau goto drop; 5215cec8ab6eSMat Martineau 5216cec8ab6eSMat Martineau event = rx_func_to_event[control->super]; 5217cec8ab6eSMat Martineau if (l2cap_rx(chan, control, skb, event)) 5218cec8ab6eSMat Martineau l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); 52190a708f8fSGustavo F. Padovan } 52200a708f8fSGustavo F. Padovan 52210a708f8fSGustavo F. Padovan return 0; 52220a708f8fSGustavo F. Padovan 52230a708f8fSGustavo F. Padovan drop: 52240a708f8fSGustavo F. Padovan kfree_skb(skb); 52250a708f8fSGustavo F. Padovan return 0; 52260a708f8fSGustavo F. Padovan } 52270a708f8fSGustavo F. Padovan 522813ca56e0SAndrei Emeltchenko static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid, 522913ca56e0SAndrei Emeltchenko struct sk_buff *skb) 52300a708f8fSGustavo F. Padovan { 523148454079SGustavo F. Padovan struct l2cap_chan *chan; 52320a708f8fSGustavo F. Padovan 5233baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, cid); 523448454079SGustavo F. Padovan if (!chan) { 523597e8e89dSAndrei Emeltchenko if (cid == L2CAP_CID_A2MP) { 523697e8e89dSAndrei Emeltchenko chan = a2mp_channel_create(conn, skb); 523797e8e89dSAndrei Emeltchenko if (!chan) { 523897e8e89dSAndrei Emeltchenko kfree_skb(skb); 523913ca56e0SAndrei Emeltchenko return; 524097e8e89dSAndrei Emeltchenko } 524197e8e89dSAndrei Emeltchenko 524297e8e89dSAndrei Emeltchenko l2cap_chan_lock(chan); 524397e8e89dSAndrei Emeltchenko } else { 52440a708f8fSGustavo F. Padovan BT_DBG("unknown cid 0x%4.4x", cid); 52456be36555SAndrei Emeltchenko /* Drop packet and return */ 52463379013bSDan Carpenter kfree_skb(skb); 524713ca56e0SAndrei Emeltchenko return; 52480a708f8fSGustavo F. Padovan } 524997e8e89dSAndrei Emeltchenko } 52500a708f8fSGustavo F. Padovan 525149208c9cSGustavo F. Padovan BT_DBG("chan %p, len %d", chan, skb->len); 52520a708f8fSGustavo F. Padovan 525389bc500eSGustavo F. Padovan if (chan->state != BT_CONNECTED) 52540a708f8fSGustavo F. Padovan goto drop; 52550a708f8fSGustavo F. Padovan 52560c1bc5c6SGustavo F. Padovan switch (chan->mode) { 52570a708f8fSGustavo F. Padovan case L2CAP_MODE_BASIC: 52580a708f8fSGustavo F. Padovan /* If socket recv buffers overflows we drop data here 52590a708f8fSGustavo F. Padovan * which is *bad* because L2CAP has to be reliable. 52600a708f8fSGustavo F. Padovan * But we don't have any other choice. L2CAP doesn't 52610a708f8fSGustavo F. Padovan * provide flow control mechanism. */ 52620a708f8fSGustavo F. Padovan 52630c1bc5c6SGustavo F. Padovan if (chan->imtu < skb->len) 52640a708f8fSGustavo F. Padovan goto drop; 52650a708f8fSGustavo F. Padovan 526680b98027SGustavo Padovan if (!chan->ops->recv(chan, skb)) 52670a708f8fSGustavo F. Padovan goto done; 52680a708f8fSGustavo F. Padovan break; 52690a708f8fSGustavo F. Padovan 52700a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 52710a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 5272cec8ab6eSMat Martineau l2cap_data_rcv(chan, skb); 52730a708f8fSGustavo F. Padovan goto done; 52740a708f8fSGustavo F. Padovan 52750a708f8fSGustavo F. Padovan default: 52760c1bc5c6SGustavo F. Padovan BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode); 52770a708f8fSGustavo F. Padovan break; 52780a708f8fSGustavo F. Padovan } 52790a708f8fSGustavo F. Padovan 52800a708f8fSGustavo F. Padovan drop: 52810a708f8fSGustavo F. Padovan kfree_skb(skb); 52820a708f8fSGustavo F. Padovan 52830a708f8fSGustavo F. Padovan done: 52846be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 52850a708f8fSGustavo F. Padovan } 52860a708f8fSGustavo F. Padovan 528784104b24SAndrei Emeltchenko static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, 528884104b24SAndrei Emeltchenko struct sk_buff *skb) 52890a708f8fSGustavo F. Padovan { 529023691d75SGustavo F. Padovan struct l2cap_chan *chan; 52910a708f8fSGustavo F. Padovan 5292c2287681SIdo Yariv chan = l2cap_global_chan_by_psm(0, psm, conn->src, conn->dst); 529323691d75SGustavo F. Padovan if (!chan) 52940a708f8fSGustavo F. Padovan goto drop; 52950a708f8fSGustavo F. Padovan 52965b4cedaaSAndrei Emeltchenko BT_DBG("chan %p, len %d", chan, skb->len); 52970a708f8fSGustavo F. Padovan 529889bc500eSGustavo F. Padovan if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) 52990a708f8fSGustavo F. Padovan goto drop; 53000a708f8fSGustavo F. Padovan 5301e13e21dcSVinicius Costa Gomes if (chan->imtu < skb->len) 53020a708f8fSGustavo F. Padovan goto drop; 53030a708f8fSGustavo F. Padovan 530480b98027SGustavo Padovan if (!chan->ops->recv(chan, skb)) 530584104b24SAndrei Emeltchenko return; 53060a708f8fSGustavo F. Padovan 53070a708f8fSGustavo F. Padovan drop: 53080a708f8fSGustavo F. Padovan kfree_skb(skb); 53090a708f8fSGustavo F. Padovan } 53100a708f8fSGustavo F. Padovan 53116810fca7SAndrei Emeltchenko static void l2cap_att_channel(struct l2cap_conn *conn, u16 cid, 5312d9b88702SAndrei Emeltchenko struct sk_buff *skb) 53139f69bda6SGustavo F. Padovan { 531423691d75SGustavo F. Padovan struct l2cap_chan *chan; 53159f69bda6SGustavo F. Padovan 5316c2287681SIdo Yariv chan = l2cap_global_chan_by_scid(0, cid, conn->src, conn->dst); 531723691d75SGustavo F. Padovan if (!chan) 53189f69bda6SGustavo F. Padovan goto drop; 53199f69bda6SGustavo F. Padovan 53205b4cedaaSAndrei Emeltchenko BT_DBG("chan %p, len %d", chan, skb->len); 53219f69bda6SGustavo F. Padovan 532289bc500eSGustavo F. Padovan if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) 53239f69bda6SGustavo F. Padovan goto drop; 53249f69bda6SGustavo F. Padovan 5325e13e21dcSVinicius Costa Gomes if (chan->imtu < skb->len) 53269f69bda6SGustavo F. Padovan goto drop; 53279f69bda6SGustavo F. Padovan 532880b98027SGustavo Padovan if (!chan->ops->recv(chan, skb)) 53296810fca7SAndrei Emeltchenko return; 53309f69bda6SGustavo F. Padovan 53319f69bda6SGustavo F. Padovan drop: 53329f69bda6SGustavo F. Padovan kfree_skb(skb); 53339f69bda6SGustavo F. Padovan } 53349f69bda6SGustavo F. Padovan 53350a708f8fSGustavo F. Padovan static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) 53360a708f8fSGustavo F. Padovan { 53370a708f8fSGustavo F. Padovan struct l2cap_hdr *lh = (void *) skb->data; 53380a708f8fSGustavo F. Padovan u16 cid, len; 53390a708f8fSGustavo F. Padovan __le16 psm; 53400a708f8fSGustavo F. Padovan 53410a708f8fSGustavo F. Padovan skb_pull(skb, L2CAP_HDR_SIZE); 53420a708f8fSGustavo F. Padovan cid = __le16_to_cpu(lh->cid); 53430a708f8fSGustavo F. Padovan len = __le16_to_cpu(lh->len); 53440a708f8fSGustavo F. Padovan 53450a708f8fSGustavo F. Padovan if (len != skb->len) { 53460a708f8fSGustavo F. Padovan kfree_skb(skb); 53470a708f8fSGustavo F. Padovan return; 53480a708f8fSGustavo F. Padovan } 53490a708f8fSGustavo F. Padovan 53500a708f8fSGustavo F. Padovan BT_DBG("len %d, cid 0x%4.4x", len, cid); 53510a708f8fSGustavo F. Padovan 53520a708f8fSGustavo F. Padovan switch (cid) { 53533300d9a9SClaudio Takahasi case L2CAP_CID_LE_SIGNALING: 53540a708f8fSGustavo F. Padovan case L2CAP_CID_SIGNALING: 53550a708f8fSGustavo F. Padovan l2cap_sig_channel(conn, skb); 53560a708f8fSGustavo F. Padovan break; 53570a708f8fSGustavo F. Padovan 53580a708f8fSGustavo F. Padovan case L2CAP_CID_CONN_LESS: 5359097db76cSAndrei Emeltchenko psm = get_unaligned((__le16 *) skb->data); 53600181a70fSAndrei Emeltchenko skb_pull(skb, L2CAP_PSMLEN_SIZE); 53610a708f8fSGustavo F. Padovan l2cap_conless_channel(conn, psm, skb); 53620a708f8fSGustavo F. Padovan break; 53630a708f8fSGustavo F. Padovan 53649f69bda6SGustavo F. Padovan case L2CAP_CID_LE_DATA: 53659f69bda6SGustavo F. Padovan l2cap_att_channel(conn, cid, skb); 53669f69bda6SGustavo F. Padovan break; 53679f69bda6SGustavo F. Padovan 5368b501d6a1SAnderson Briglia case L2CAP_CID_SMP: 5369b501d6a1SAnderson Briglia if (smp_sig_channel(conn, skb)) 5370b501d6a1SAnderson Briglia l2cap_conn_del(conn->hcon, EACCES); 5371b501d6a1SAnderson Briglia break; 5372b501d6a1SAnderson Briglia 53730a708f8fSGustavo F. Padovan default: 53740a708f8fSGustavo F. Padovan l2cap_data_channel(conn, cid, skb); 53750a708f8fSGustavo F. Padovan break; 53760a708f8fSGustavo F. Padovan } 53770a708f8fSGustavo F. Padovan } 53780a708f8fSGustavo F. Padovan 53790a708f8fSGustavo F. Padovan /* ---- L2CAP interface with lower layer (HCI) ---- */ 53800a708f8fSGustavo F. Padovan 5381686ebf28SUlisses Furquim int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr) 53820a708f8fSGustavo F. Padovan { 53830a708f8fSGustavo F. Padovan int exact = 0, lm1 = 0, lm2 = 0; 538423691d75SGustavo F. Padovan struct l2cap_chan *c; 53850a708f8fSGustavo F. Padovan 53866ed93dc6SAndrei Emeltchenko BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr); 53870a708f8fSGustavo F. Padovan 53880a708f8fSGustavo F. Padovan /* Find listening sockets and check their link_mode */ 538923691d75SGustavo F. Padovan read_lock(&chan_list_lock); 539023691d75SGustavo F. Padovan list_for_each_entry(c, &chan_list, global_l) { 539123691d75SGustavo F. Padovan struct sock *sk = c->sk; 53924343478fSGustavo F. Padovan 539389bc500eSGustavo F. Padovan if (c->state != BT_LISTEN) 53940a708f8fSGustavo F. Padovan continue; 53950a708f8fSGustavo F. Padovan 53960a708f8fSGustavo F. Padovan if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { 53970a708f8fSGustavo F. Padovan lm1 |= HCI_LM_ACCEPT; 539843bd0f32SAndrei Emeltchenko if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) 53990a708f8fSGustavo F. Padovan lm1 |= HCI_LM_MASTER; 54000a708f8fSGustavo F. Padovan exact++; 54010a708f8fSGustavo F. Padovan } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { 54020a708f8fSGustavo F. Padovan lm2 |= HCI_LM_ACCEPT; 540343bd0f32SAndrei Emeltchenko if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) 54040a708f8fSGustavo F. Padovan lm2 |= HCI_LM_MASTER; 54050a708f8fSGustavo F. Padovan } 54060a708f8fSGustavo F. Padovan } 540723691d75SGustavo F. Padovan read_unlock(&chan_list_lock); 54080a708f8fSGustavo F. Padovan 54090a708f8fSGustavo F. Padovan return exact ? lm1 : lm2; 54100a708f8fSGustavo F. Padovan } 54110a708f8fSGustavo F. Padovan 54129e664631SAndrei Emeltchenko void l2cap_connect_cfm(struct hci_conn *hcon, u8 status) 54130a708f8fSGustavo F. Padovan { 54140a708f8fSGustavo F. Padovan struct l2cap_conn *conn; 54150a708f8fSGustavo F. Padovan 54166ed93dc6SAndrei Emeltchenko BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status); 54170a708f8fSGustavo F. Padovan 54180a708f8fSGustavo F. Padovan if (!status) { 54190a708f8fSGustavo F. Padovan conn = l2cap_conn_add(hcon, status); 54200a708f8fSGustavo F. Padovan if (conn) 54210a708f8fSGustavo F. Padovan l2cap_conn_ready(conn); 54220a708f8fSGustavo F. Padovan } else 5423e175072fSJoe Perches l2cap_conn_del(hcon, bt_to_errno(status)); 54240a708f8fSGustavo F. Padovan 54250a708f8fSGustavo F. Padovan } 54260a708f8fSGustavo F. Padovan 5427686ebf28SUlisses Furquim int l2cap_disconn_ind(struct hci_conn *hcon) 54280a708f8fSGustavo F. Padovan { 54290a708f8fSGustavo F. Padovan struct l2cap_conn *conn = hcon->l2cap_data; 54300a708f8fSGustavo F. Padovan 54310a708f8fSGustavo F. Padovan BT_DBG("hcon %p", hcon); 54320a708f8fSGustavo F. Padovan 5433686ebf28SUlisses Furquim if (!conn) 54349f5a0d7bSAndrei Emeltchenko return HCI_ERROR_REMOTE_USER_TERM; 54350a708f8fSGustavo F. Padovan return conn->disc_reason; 54360a708f8fSGustavo F. Padovan } 54370a708f8fSGustavo F. Padovan 54389e664631SAndrei Emeltchenko void l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) 54390a708f8fSGustavo F. Padovan { 54400a708f8fSGustavo F. Padovan BT_DBG("hcon %p reason %d", hcon, reason); 54410a708f8fSGustavo F. Padovan 5442e175072fSJoe Perches l2cap_conn_del(hcon, bt_to_errno(reason)); 54430a708f8fSGustavo F. Padovan } 54440a708f8fSGustavo F. Padovan 54454343478fSGustavo F. Padovan static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt) 54460a708f8fSGustavo F. Padovan { 5447715ec005SGustavo F. Padovan if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) 54480a708f8fSGustavo F. Padovan return; 54490a708f8fSGustavo F. Padovan 54500a708f8fSGustavo F. Padovan if (encrypt == 0x00) { 54514343478fSGustavo F. Padovan if (chan->sec_level == BT_SECURITY_MEDIUM) { 5452ba13ccd9SMarcel Holtmann __set_chan_timer(chan, L2CAP_ENC_TIMEOUT); 54534343478fSGustavo F. Padovan } else if (chan->sec_level == BT_SECURITY_HIGH) 54540f852724SGustavo F. Padovan l2cap_chan_close(chan, ECONNREFUSED); 54550a708f8fSGustavo F. Padovan } else { 54564343478fSGustavo F. Padovan if (chan->sec_level == BT_SECURITY_MEDIUM) 5457c9b66675SGustavo F. Padovan __clear_chan_timer(chan); 54580a708f8fSGustavo F. Padovan } 54590a708f8fSGustavo F. Padovan } 54600a708f8fSGustavo F. Padovan 5461686ebf28SUlisses Furquim int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) 54620a708f8fSGustavo F. Padovan { 54630a708f8fSGustavo F. Padovan struct l2cap_conn *conn = hcon->l2cap_data; 546448454079SGustavo F. Padovan struct l2cap_chan *chan; 54650a708f8fSGustavo F. Padovan 54660a708f8fSGustavo F. Padovan if (!conn) 54670a708f8fSGustavo F. Padovan return 0; 54680a708f8fSGustavo F. Padovan 546989d8b407SAndrei Emeltchenko BT_DBG("conn %p status 0x%2.2x encrypt %u", conn, status, encrypt); 54700a708f8fSGustavo F. Padovan 5471160dc6acSVinicius Costa Gomes if (hcon->type == LE_LINK) { 547235d4adccSHemant Gupta if (!status && encrypt) 5473160dc6acSVinicius Costa Gomes smp_distribute_keys(conn, 0); 547417cd3f37SUlisses Furquim cancel_delayed_work(&conn->security_timer); 5475160dc6acSVinicius Costa Gomes } 5476160dc6acSVinicius Costa Gomes 54773df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 54780a708f8fSGustavo F. Padovan 54793df91ea2SAndrei Emeltchenko list_for_each_entry(chan, &conn->chan_l, list) { 54806be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 54810a708f8fSGustavo F. Padovan 548289d8b407SAndrei Emeltchenko BT_DBG("chan %p scid 0x%4.4x state %s", chan, chan->scid, 548389d8b407SAndrei Emeltchenko state_to_string(chan->state)); 5484f1cb9af5SVinicius Costa Gomes 548578eb2f98SAndrei Emeltchenko if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) { 548678eb2f98SAndrei Emeltchenko l2cap_chan_unlock(chan); 548778eb2f98SAndrei Emeltchenko continue; 548878eb2f98SAndrei Emeltchenko } 548978eb2f98SAndrei Emeltchenko 5490f1cb9af5SVinicius Costa Gomes if (chan->scid == L2CAP_CID_LE_DATA) { 5491f1cb9af5SVinicius Costa Gomes if (!status && encrypt) { 5492f1cb9af5SVinicius Costa Gomes chan->sec_level = hcon->sec_level; 5493cf4cd009SAndrei Emeltchenko l2cap_chan_ready(chan); 5494f1cb9af5SVinicius Costa Gomes } 5495f1cb9af5SVinicius Costa Gomes 54966be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 5497f1cb9af5SVinicius Costa Gomes continue; 5498f1cb9af5SVinicius Costa Gomes } 5499f1cb9af5SVinicius Costa Gomes 5500c1360a1cSGustavo F. Padovan if (test_bit(CONF_CONNECT_PEND, &chan->conf_state)) { 55016be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 55020a708f8fSGustavo F. Padovan continue; 55030a708f8fSGustavo F. Padovan } 55040a708f8fSGustavo F. Padovan 550589bc500eSGustavo F. Padovan if (!status && (chan->state == BT_CONNECTED || 550689bc500eSGustavo F. Padovan chan->state == BT_CONFIG)) { 5507a7d7723aSGustavo Padovan struct sock *sk = chan->sk; 5508a7d7723aSGustavo Padovan 5509c5daa683SGustavo Padovan clear_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags); 5510a7d7723aSGustavo Padovan sk->sk_state_change(sk); 5511a7d7723aSGustavo Padovan 55124343478fSGustavo F. Padovan l2cap_check_encryption(chan, encrypt); 55136be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 55140a708f8fSGustavo F. Padovan continue; 55150a708f8fSGustavo F. Padovan } 55160a708f8fSGustavo F. Padovan 551789bc500eSGustavo F. Padovan if (chan->state == BT_CONNECT) { 55180a708f8fSGustavo F. Padovan if (!status) { 551993c3e8f5SAndrei Emeltchenko l2cap_start_connection(chan); 55200a708f8fSGustavo F. Padovan } else { 5521ba13ccd9SMarcel Holtmann __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); 55220a708f8fSGustavo F. Padovan } 552389bc500eSGustavo F. Padovan } else if (chan->state == BT_CONNECT2) { 55246be36555SAndrei Emeltchenko struct sock *sk = chan->sk; 55250a708f8fSGustavo F. Padovan struct l2cap_conn_rsp rsp; 5526df3c3931SJohan Hedberg __u16 res, stat; 55270a708f8fSGustavo F. Padovan 55286be36555SAndrei Emeltchenko lock_sock(sk); 55296be36555SAndrei Emeltchenko 55300a708f8fSGustavo F. Padovan if (!status) { 5531c5daa683SGustavo Padovan if (test_bit(BT_SK_DEFER_SETUP, 5532c5daa683SGustavo Padovan &bt_sk(sk)->flags)) { 5533df3c3931SJohan Hedberg struct sock *parent = bt_sk(sk)->parent; 5534df3c3931SJohan Hedberg res = L2CAP_CR_PEND; 5535df3c3931SJohan Hedberg stat = L2CAP_CS_AUTHOR_PEND; 553605e9a2f6SIlia Kolomisnky if (parent) 5537df3c3931SJohan Hedberg parent->sk_data_ready(parent, 0); 5538df3c3931SJohan Hedberg } else { 55390e587be7SAndrei Emeltchenko __l2cap_state_change(chan, BT_CONFIG); 5540df3c3931SJohan Hedberg res = L2CAP_CR_SUCCESS; 5541df3c3931SJohan Hedberg stat = L2CAP_CS_NO_INFO; 5542df3c3931SJohan Hedberg } 55430a708f8fSGustavo F. Padovan } else { 55440e587be7SAndrei Emeltchenko __l2cap_state_change(chan, BT_DISCONN); 5545ba13ccd9SMarcel Holtmann __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); 5546df3c3931SJohan Hedberg res = L2CAP_CR_SEC_BLOCK; 5547df3c3931SJohan Hedberg stat = L2CAP_CS_NO_INFO; 55480a708f8fSGustavo F. Padovan } 55490a708f8fSGustavo F. Padovan 55506be36555SAndrei Emeltchenko release_sock(sk); 55516be36555SAndrei Emeltchenko 5552fe4128e0SGustavo F. Padovan rsp.scid = cpu_to_le16(chan->dcid); 5553fe4128e0SGustavo F. Padovan rsp.dcid = cpu_to_le16(chan->scid); 5554df3c3931SJohan Hedberg rsp.result = cpu_to_le16(res); 5555df3c3931SJohan Hedberg rsp.status = cpu_to_le16(stat); 5556fc7f8a7eSGustavo F. Padovan l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, 5557fc7f8a7eSGustavo F. Padovan sizeof(rsp), &rsp); 55582d369359SMat Martineau 55592d369359SMat Martineau if (!test_bit(CONF_REQ_SENT, &chan->conf_state) && 55602d369359SMat Martineau res == L2CAP_CR_SUCCESS) { 55612d369359SMat Martineau char buf[128]; 55622d369359SMat Martineau set_bit(CONF_REQ_SENT, &chan->conf_state); 55632d369359SMat Martineau l2cap_send_cmd(conn, l2cap_get_ident(conn), 55642d369359SMat Martineau L2CAP_CONF_REQ, 55652d369359SMat Martineau l2cap_build_conf_req(chan, buf), 55662d369359SMat Martineau buf); 55672d369359SMat Martineau chan->num_conf_req++; 55682d369359SMat Martineau } 55690a708f8fSGustavo F. Padovan } 55700a708f8fSGustavo F. Padovan 55716be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 55720a708f8fSGustavo F. Padovan } 55730a708f8fSGustavo F. Padovan 55743df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 55750a708f8fSGustavo F. Padovan 55760a708f8fSGustavo F. Padovan return 0; 55770a708f8fSGustavo F. Padovan } 55780a708f8fSGustavo F. Padovan 5579686ebf28SUlisses Furquim int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) 55800a708f8fSGustavo F. Padovan { 55810a708f8fSGustavo F. Padovan struct l2cap_conn *conn = hcon->l2cap_data; 55820a708f8fSGustavo F. Padovan 55830a708f8fSGustavo F. Padovan if (!conn) 55840a708f8fSGustavo F. Padovan conn = l2cap_conn_add(hcon, 0); 55850a708f8fSGustavo F. Padovan 55860a708f8fSGustavo F. Padovan if (!conn) 55870a708f8fSGustavo F. Padovan goto drop; 55880a708f8fSGustavo F. Padovan 55890a708f8fSGustavo F. Padovan BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); 55900a708f8fSGustavo F. Padovan 55910a708f8fSGustavo F. Padovan if (!(flags & ACL_CONT)) { 55920a708f8fSGustavo F. Padovan struct l2cap_hdr *hdr; 55930a708f8fSGustavo F. Padovan int len; 55940a708f8fSGustavo F. Padovan 55950a708f8fSGustavo F. Padovan if (conn->rx_len) { 55960a708f8fSGustavo F. Padovan BT_ERR("Unexpected start frame (len %d)", skb->len); 55970a708f8fSGustavo F. Padovan kfree_skb(conn->rx_skb); 55980a708f8fSGustavo F. Padovan conn->rx_skb = NULL; 55990a708f8fSGustavo F. Padovan conn->rx_len = 0; 56000a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 56010a708f8fSGustavo F. Padovan } 56020a708f8fSGustavo F. Padovan 56030a708f8fSGustavo F. Padovan /* Start fragment always begin with Basic L2CAP header */ 56040a708f8fSGustavo F. Padovan if (skb->len < L2CAP_HDR_SIZE) { 56050a708f8fSGustavo F. Padovan BT_ERR("Frame is too short (len %d)", skb->len); 56060a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 56070a708f8fSGustavo F. Padovan goto drop; 56080a708f8fSGustavo F. Padovan } 56090a708f8fSGustavo F. Padovan 56100a708f8fSGustavo F. Padovan hdr = (struct l2cap_hdr *) skb->data; 56110a708f8fSGustavo F. Padovan len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; 56120a708f8fSGustavo F. Padovan 56130a708f8fSGustavo F. Padovan if (len == skb->len) { 56140a708f8fSGustavo F. Padovan /* Complete frame received */ 56150a708f8fSGustavo F. Padovan l2cap_recv_frame(conn, skb); 56160a708f8fSGustavo F. Padovan return 0; 56170a708f8fSGustavo F. Padovan } 56180a708f8fSGustavo F. Padovan 56190a708f8fSGustavo F. Padovan BT_DBG("Start: total len %d, frag len %d", len, skb->len); 56200a708f8fSGustavo F. Padovan 56210a708f8fSGustavo F. Padovan if (skb->len > len) { 56220a708f8fSGustavo F. Padovan BT_ERR("Frame is too long (len %d, expected len %d)", 56230a708f8fSGustavo F. Padovan skb->len, len); 56240a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 56250a708f8fSGustavo F. Padovan goto drop; 56260a708f8fSGustavo F. Padovan } 56270a708f8fSGustavo F. Padovan 56280a708f8fSGustavo F. Padovan /* Allocate skb for the complete frame (with header) */ 56298bcde1f2SGustavo Padovan conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL); 56300a708f8fSGustavo F. Padovan if (!conn->rx_skb) 56310a708f8fSGustavo F. Padovan goto drop; 56320a708f8fSGustavo F. Padovan 56330a708f8fSGustavo F. Padovan skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), 56340a708f8fSGustavo F. Padovan skb->len); 56350a708f8fSGustavo F. Padovan conn->rx_len = len - skb->len; 56360a708f8fSGustavo F. Padovan } else { 56370a708f8fSGustavo F. Padovan BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); 56380a708f8fSGustavo F. Padovan 56390a708f8fSGustavo F. Padovan if (!conn->rx_len) { 56400a708f8fSGustavo F. Padovan BT_ERR("Unexpected continuation frame (len %d)", skb->len); 56410a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 56420a708f8fSGustavo F. Padovan goto drop; 56430a708f8fSGustavo F. Padovan } 56440a708f8fSGustavo F. Padovan 56450a708f8fSGustavo F. Padovan if (skb->len > conn->rx_len) { 56460a708f8fSGustavo F. Padovan BT_ERR("Fragment is too long (len %d, expected %d)", 56470a708f8fSGustavo F. Padovan skb->len, conn->rx_len); 56480a708f8fSGustavo F. Padovan kfree_skb(conn->rx_skb); 56490a708f8fSGustavo F. Padovan conn->rx_skb = NULL; 56500a708f8fSGustavo F. Padovan conn->rx_len = 0; 56510a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 56520a708f8fSGustavo F. Padovan goto drop; 56530a708f8fSGustavo F. Padovan } 56540a708f8fSGustavo F. Padovan 56550a708f8fSGustavo F. Padovan skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), 56560a708f8fSGustavo F. Padovan skb->len); 56570a708f8fSGustavo F. Padovan conn->rx_len -= skb->len; 56580a708f8fSGustavo F. Padovan 56590a708f8fSGustavo F. Padovan if (!conn->rx_len) { 56600a708f8fSGustavo F. Padovan /* Complete frame received */ 56610a708f8fSGustavo F. Padovan l2cap_recv_frame(conn, conn->rx_skb); 56620a708f8fSGustavo F. Padovan conn->rx_skb = NULL; 56630a708f8fSGustavo F. Padovan } 56640a708f8fSGustavo F. Padovan } 56650a708f8fSGustavo F. Padovan 56660a708f8fSGustavo F. Padovan drop: 56670a708f8fSGustavo F. Padovan kfree_skb(skb); 56680a708f8fSGustavo F. Padovan return 0; 56690a708f8fSGustavo F. Padovan } 56700a708f8fSGustavo F. Padovan 56710a708f8fSGustavo F. Padovan static int l2cap_debugfs_show(struct seq_file *f, void *p) 56720a708f8fSGustavo F. Padovan { 567323691d75SGustavo F. Padovan struct l2cap_chan *c; 56740a708f8fSGustavo F. Padovan 5675333055f2SGustavo F. Padovan read_lock(&chan_list_lock); 56760a708f8fSGustavo F. Padovan 567723691d75SGustavo F. Padovan list_for_each_entry(c, &chan_list, global_l) { 567823691d75SGustavo F. Padovan struct sock *sk = c->sk; 56790a708f8fSGustavo F. Padovan 5680fcb73338SAndrei Emeltchenko seq_printf(f, "%pMR %pMR %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", 5681fcb73338SAndrei Emeltchenko &bt_sk(sk)->src, &bt_sk(sk)->dst, 568289bc500eSGustavo F. Padovan c->state, __le16_to_cpu(c->psm), 568323691d75SGustavo F. Padovan c->scid, c->dcid, c->imtu, c->omtu, 568423691d75SGustavo F. Padovan c->sec_level, c->mode); 56850a708f8fSGustavo F. Padovan } 56860a708f8fSGustavo F. Padovan 5687333055f2SGustavo F. Padovan read_unlock(&chan_list_lock); 56880a708f8fSGustavo F. Padovan 56890a708f8fSGustavo F. Padovan return 0; 56900a708f8fSGustavo F. Padovan } 56910a708f8fSGustavo F. Padovan 56920a708f8fSGustavo F. Padovan static int l2cap_debugfs_open(struct inode *inode, struct file *file) 56930a708f8fSGustavo F. Padovan { 56940a708f8fSGustavo F. Padovan return single_open(file, l2cap_debugfs_show, inode->i_private); 56950a708f8fSGustavo F. Padovan } 56960a708f8fSGustavo F. Padovan 56970a708f8fSGustavo F. Padovan static const struct file_operations l2cap_debugfs_fops = { 56980a708f8fSGustavo F. Padovan .open = l2cap_debugfs_open, 56990a708f8fSGustavo F. Padovan .read = seq_read, 57000a708f8fSGustavo F. Padovan .llseek = seq_lseek, 57010a708f8fSGustavo F. Padovan .release = single_release, 57020a708f8fSGustavo F. Padovan }; 57030a708f8fSGustavo F. Padovan 57040a708f8fSGustavo F. Padovan static struct dentry *l2cap_debugfs; 57050a708f8fSGustavo F. Padovan 570664274518SGustavo F. Padovan int __init l2cap_init(void) 57070a708f8fSGustavo F. Padovan { 57080a708f8fSGustavo F. Padovan int err; 57090a708f8fSGustavo F. Padovan 5710bb58f747SGustavo F. Padovan err = l2cap_init_sockets(); 57110a708f8fSGustavo F. Padovan if (err < 0) 57120a708f8fSGustavo F. Padovan return err; 57130a708f8fSGustavo F. Padovan 57140a708f8fSGustavo F. Padovan if (bt_debugfs) { 57152d792818SGustavo Padovan l2cap_debugfs = debugfs_create_file("l2cap", 0444, bt_debugfs, 57162d792818SGustavo Padovan NULL, &l2cap_debugfs_fops); 57170a708f8fSGustavo F. Padovan if (!l2cap_debugfs) 57180a708f8fSGustavo F. Padovan BT_ERR("Failed to create L2CAP debug file"); 57190a708f8fSGustavo F. Padovan } 57200a708f8fSGustavo F. Padovan 57210a708f8fSGustavo F. Padovan return 0; 57220a708f8fSGustavo F. Padovan } 57230a708f8fSGustavo F. Padovan 572464274518SGustavo F. Padovan void l2cap_exit(void) 57250a708f8fSGustavo F. Padovan { 57260a708f8fSGustavo F. Padovan debugfs_remove(l2cap_debugfs); 5727bb58f747SGustavo F. Padovan l2cap_cleanup_sockets(); 57280a708f8fSGustavo F. Padovan } 57290a708f8fSGustavo F. Padovan 57300a708f8fSGustavo F. Padovan module_param(disable_ertm, bool, 0644); 57310a708f8fSGustavo F. Padovan MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); 5732