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 63baa7e1faSGustavo F. Padovan static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, u16 cid) 640a708f8fSGustavo F. Padovan { 653df91ea2SAndrei Emeltchenko struct l2cap_chan *c; 66baa7e1faSGustavo F. Padovan 673df91ea2SAndrei Emeltchenko list_for_each_entry(c, &conn->chan_l, list) { 683df91ea2SAndrei Emeltchenko if (c->dcid == cid) 693df91ea2SAndrei Emeltchenko return c; 700a708f8fSGustavo F. Padovan } 713df91ea2SAndrei Emeltchenko return NULL; 72baa7e1faSGustavo F. Padovan } 730a708f8fSGustavo F. Padovan 74baa7e1faSGustavo F. Padovan static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) 750a708f8fSGustavo F. Padovan { 763df91ea2SAndrei Emeltchenko struct l2cap_chan *c; 77baa7e1faSGustavo F. Padovan 783df91ea2SAndrei Emeltchenko list_for_each_entry(c, &conn->chan_l, list) { 793df91ea2SAndrei Emeltchenko if (c->scid == cid) 803df91ea2SAndrei Emeltchenko return c; 810a708f8fSGustavo F. Padovan } 823df91ea2SAndrei Emeltchenko return NULL; 83baa7e1faSGustavo F. Padovan } 840a708f8fSGustavo F. Padovan 850a708f8fSGustavo F. Padovan /* Find channel with given SCID. 86ef191adeSMat Martineau * Returns locked channel. */ 87baa7e1faSGustavo F. Padovan static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) 880a708f8fSGustavo F. Padovan { 8948454079SGustavo F. Padovan struct l2cap_chan *c; 90baa7e1faSGustavo F. Padovan 913df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 92baa7e1faSGustavo F. Padovan c = __l2cap_get_chan_by_scid(conn, cid); 93ef191adeSMat Martineau if (c) 94ef191adeSMat Martineau l2cap_chan_lock(c); 953df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 963df91ea2SAndrei Emeltchenko 9748454079SGustavo F. Padovan return c; 980a708f8fSGustavo F. Padovan } 990a708f8fSGustavo F. Padovan 100baa7e1faSGustavo F. Padovan static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident) 1010a708f8fSGustavo F. Padovan { 1023df91ea2SAndrei Emeltchenko struct l2cap_chan *c; 103baa7e1faSGustavo F. Padovan 1043df91ea2SAndrei Emeltchenko list_for_each_entry(c, &conn->chan_l, list) { 1053df91ea2SAndrei Emeltchenko if (c->ident == ident) 1063df91ea2SAndrei Emeltchenko return c; 1070a708f8fSGustavo F. Padovan } 1083df91ea2SAndrei Emeltchenko return NULL; 109baa7e1faSGustavo F. Padovan } 1100a708f8fSGustavo F. Padovan 11123691d75SGustavo F. Padovan static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src) 1129e4425ffSGustavo F. Padovan { 11323691d75SGustavo F. Padovan struct l2cap_chan *c; 1149e4425ffSGustavo F. Padovan 11523691d75SGustavo F. Padovan list_for_each_entry(c, &chan_list, global_l) { 11623691d75SGustavo F. Padovan if (c->sport == psm && !bacmp(&bt_sk(c->sk)->src, src)) 11723691d75SGustavo F. Padovan return c; 1189e4425ffSGustavo F. Padovan } 119250938cbSSzymon Janc return NULL; 120250938cbSSzymon Janc } 1219e4425ffSGustavo F. Padovan 1229e4425ffSGustavo F. Padovan int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm) 1239e4425ffSGustavo F. Padovan { 12473b2ec18SGustavo F. Padovan int err; 12573b2ec18SGustavo F. Padovan 126333055f2SGustavo F. Padovan write_lock(&chan_list_lock); 1279e4425ffSGustavo F. Padovan 12823691d75SGustavo F. Padovan if (psm && __l2cap_global_chan_by_addr(psm, src)) { 12973b2ec18SGustavo F. Padovan err = -EADDRINUSE; 13073b2ec18SGustavo F. Padovan goto done; 1319e4425ffSGustavo F. Padovan } 1329e4425ffSGustavo F. Padovan 13373b2ec18SGustavo F. Padovan if (psm) { 1349e4425ffSGustavo F. Padovan chan->psm = psm; 1359e4425ffSGustavo F. Padovan chan->sport = psm; 13673b2ec18SGustavo F. Padovan err = 0; 13773b2ec18SGustavo F. Padovan } else { 13873b2ec18SGustavo F. Padovan u16 p; 1399e4425ffSGustavo F. Padovan 14073b2ec18SGustavo F. Padovan err = -EINVAL; 14173b2ec18SGustavo F. Padovan for (p = 0x1001; p < 0x1100; p += 2) 14223691d75SGustavo F. Padovan if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) { 14373b2ec18SGustavo F. Padovan chan->psm = cpu_to_le16(p); 14473b2ec18SGustavo F. Padovan chan->sport = cpu_to_le16(p); 14573b2ec18SGustavo F. Padovan err = 0; 14673b2ec18SGustavo F. Padovan break; 14773b2ec18SGustavo F. Padovan } 14873b2ec18SGustavo F. Padovan } 14973b2ec18SGustavo F. Padovan 15073b2ec18SGustavo F. Padovan done: 151333055f2SGustavo F. Padovan write_unlock(&chan_list_lock); 15273b2ec18SGustavo F. Padovan return err; 1539e4425ffSGustavo F. Padovan } 1549e4425ffSGustavo F. Padovan 1559e4425ffSGustavo F. Padovan int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid) 1569e4425ffSGustavo F. Padovan { 157333055f2SGustavo F. Padovan write_lock(&chan_list_lock); 1589e4425ffSGustavo F. Padovan 1599e4425ffSGustavo F. Padovan chan->scid = scid; 1609e4425ffSGustavo F. Padovan 161333055f2SGustavo F. Padovan write_unlock(&chan_list_lock); 1629e4425ffSGustavo F. Padovan 1639e4425ffSGustavo F. Padovan return 0; 1649e4425ffSGustavo F. Padovan } 1659e4425ffSGustavo F. Padovan 166baa7e1faSGustavo F. Padovan static u16 l2cap_alloc_cid(struct l2cap_conn *conn) 1670a708f8fSGustavo F. Padovan { 1680a708f8fSGustavo F. Padovan u16 cid = L2CAP_CID_DYN_START; 1690a708f8fSGustavo F. Padovan 1700a708f8fSGustavo F. Padovan for (; cid < L2CAP_CID_DYN_END; cid++) { 171baa7e1faSGustavo F. Padovan if (!__l2cap_get_chan_by_scid(conn, cid)) 1720a708f8fSGustavo F. Padovan return cid; 1730a708f8fSGustavo F. Padovan } 1740a708f8fSGustavo F. Padovan 1750a708f8fSGustavo F. Padovan return 0; 1760a708f8fSGustavo F. Padovan } 1770a708f8fSGustavo F. Padovan 1780e587be7SAndrei Emeltchenko static void __l2cap_state_change(struct l2cap_chan *chan, int state) 17989bc500eSGustavo F. Padovan { 18042d2d87cSAndrei Emeltchenko BT_DBG("chan %p %s -> %s", chan, state_to_string(chan->state), 181badaaa00SGustavo F. Padovan state_to_string(state)); 182badaaa00SGustavo F. Padovan 18389bc500eSGustavo F. Padovan chan->state = state; 18480b98027SGustavo Padovan chan->ops->state_change(chan, state); 18589bc500eSGustavo F. Padovan } 18689bc500eSGustavo F. Padovan 1870e587be7SAndrei Emeltchenko static void l2cap_state_change(struct l2cap_chan *chan, int state) 1880e587be7SAndrei Emeltchenko { 1890e587be7SAndrei Emeltchenko struct sock *sk = chan->sk; 1900e587be7SAndrei Emeltchenko 1910e587be7SAndrei Emeltchenko lock_sock(sk); 1920e587be7SAndrei Emeltchenko __l2cap_state_change(chan, state); 1930e587be7SAndrei Emeltchenko release_sock(sk); 1940e587be7SAndrei Emeltchenko } 1950e587be7SAndrei Emeltchenko 1962e0052e4SAndrei Emeltchenko static inline void __l2cap_chan_set_err(struct l2cap_chan *chan, int err) 1972e0052e4SAndrei Emeltchenko { 1982e0052e4SAndrei Emeltchenko struct sock *sk = chan->sk; 1992e0052e4SAndrei Emeltchenko 2002e0052e4SAndrei Emeltchenko sk->sk_err = err; 2012e0052e4SAndrei Emeltchenko } 2022e0052e4SAndrei Emeltchenko 2032e0052e4SAndrei Emeltchenko static inline void l2cap_chan_set_err(struct l2cap_chan *chan, int err) 2042e0052e4SAndrei Emeltchenko { 2052e0052e4SAndrei Emeltchenko struct sock *sk = chan->sk; 2062e0052e4SAndrei Emeltchenko 2072e0052e4SAndrei Emeltchenko lock_sock(sk); 2082e0052e4SAndrei Emeltchenko __l2cap_chan_set_err(chan, err); 2092e0052e4SAndrei Emeltchenko release_sock(sk); 2102e0052e4SAndrei Emeltchenko } 2112e0052e4SAndrei Emeltchenko 2124239d16fSMat Martineau static void __set_retrans_timer(struct l2cap_chan *chan) 2134239d16fSMat Martineau { 2144239d16fSMat Martineau if (!delayed_work_pending(&chan->monitor_timer) && 2154239d16fSMat Martineau chan->retrans_timeout) { 2164239d16fSMat Martineau l2cap_set_timer(chan, &chan->retrans_timer, 2174239d16fSMat Martineau msecs_to_jiffies(chan->retrans_timeout)); 2184239d16fSMat Martineau } 2194239d16fSMat Martineau } 2204239d16fSMat Martineau 2214239d16fSMat Martineau static void __set_monitor_timer(struct l2cap_chan *chan) 2224239d16fSMat Martineau { 2234239d16fSMat Martineau __clear_retrans_timer(chan); 2244239d16fSMat Martineau if (chan->monitor_timeout) { 2254239d16fSMat Martineau l2cap_set_timer(chan, &chan->monitor_timer, 2264239d16fSMat Martineau msecs_to_jiffies(chan->monitor_timeout)); 2274239d16fSMat Martineau } 2284239d16fSMat Martineau } 2294239d16fSMat Martineau 230608bcc6dSMat Martineau static struct sk_buff *l2cap_ertm_seq_in_queue(struct sk_buff_head *head, 231608bcc6dSMat Martineau u16 seq) 232608bcc6dSMat Martineau { 233608bcc6dSMat Martineau struct sk_buff *skb; 234608bcc6dSMat Martineau 235608bcc6dSMat Martineau skb_queue_walk(head, skb) { 236608bcc6dSMat Martineau if (bt_cb(skb)->control.txseq == seq) 237608bcc6dSMat Martineau return skb; 238608bcc6dSMat Martineau } 239608bcc6dSMat Martineau 240608bcc6dSMat Martineau return NULL; 241608bcc6dSMat Martineau } 242608bcc6dSMat Martineau 2433c588192SMat Martineau /* ---- L2CAP sequence number lists ---- */ 2443c588192SMat Martineau 2453c588192SMat Martineau /* For ERTM, ordered lists of sequence numbers must be tracked for 2463c588192SMat Martineau * SREJ requests that are received and for frames that are to be 2473c588192SMat Martineau * retransmitted. These seq_list functions implement a singly-linked 2483c588192SMat Martineau * list in an array, where membership in the list can also be checked 2493c588192SMat Martineau * in constant time. Items can also be added to the tail of the list 2503c588192SMat Martineau * and removed from the head in constant time, without further memory 2513c588192SMat Martineau * allocs or frees. 2523c588192SMat Martineau */ 2533c588192SMat Martineau 2543c588192SMat Martineau static int l2cap_seq_list_init(struct l2cap_seq_list *seq_list, u16 size) 2553c588192SMat Martineau { 2563c588192SMat Martineau size_t alloc_size, i; 2573c588192SMat Martineau 2583c588192SMat Martineau /* Allocated size is a power of 2 to map sequence numbers 2593c588192SMat Martineau * (which may be up to 14 bits) in to a smaller array that is 2603c588192SMat Martineau * sized for the negotiated ERTM transmit windows. 2613c588192SMat Martineau */ 2623c588192SMat Martineau alloc_size = roundup_pow_of_two(size); 2633c588192SMat Martineau 2643c588192SMat Martineau seq_list->list = kmalloc(sizeof(u16) * alloc_size, GFP_KERNEL); 2653c588192SMat Martineau if (!seq_list->list) 2663c588192SMat Martineau return -ENOMEM; 2673c588192SMat Martineau 2683c588192SMat Martineau seq_list->mask = alloc_size - 1; 2693c588192SMat Martineau seq_list->head = L2CAP_SEQ_LIST_CLEAR; 2703c588192SMat Martineau seq_list->tail = L2CAP_SEQ_LIST_CLEAR; 2713c588192SMat Martineau for (i = 0; i < alloc_size; i++) 2723c588192SMat Martineau seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; 2733c588192SMat Martineau 2743c588192SMat Martineau return 0; 2753c588192SMat Martineau } 2763c588192SMat Martineau 2773c588192SMat Martineau static inline void l2cap_seq_list_free(struct l2cap_seq_list *seq_list) 2783c588192SMat Martineau { 2793c588192SMat Martineau kfree(seq_list->list); 2803c588192SMat Martineau } 2813c588192SMat Martineau 2823c588192SMat Martineau static inline bool l2cap_seq_list_contains(struct l2cap_seq_list *seq_list, 2833c588192SMat Martineau u16 seq) 2843c588192SMat Martineau { 2853c588192SMat Martineau /* Constant-time check for list membership */ 2863c588192SMat Martineau return seq_list->list[seq & seq_list->mask] != L2CAP_SEQ_LIST_CLEAR; 2873c588192SMat Martineau } 2883c588192SMat Martineau 2893c588192SMat Martineau static u16 l2cap_seq_list_remove(struct l2cap_seq_list *seq_list, u16 seq) 2903c588192SMat Martineau { 2913c588192SMat Martineau u16 mask = seq_list->mask; 2923c588192SMat Martineau 2933c588192SMat Martineau if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) { 2943c588192SMat Martineau /* In case someone tries to pop the head of an empty list */ 2953c588192SMat Martineau return L2CAP_SEQ_LIST_CLEAR; 2963c588192SMat Martineau } else if (seq_list->head == seq) { 2973c588192SMat Martineau /* Head can be removed in constant time */ 2983c588192SMat Martineau seq_list->head = seq_list->list[seq & mask]; 2993c588192SMat Martineau seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR; 3003c588192SMat Martineau 3013c588192SMat Martineau if (seq_list->head == L2CAP_SEQ_LIST_TAIL) { 3023c588192SMat Martineau seq_list->head = L2CAP_SEQ_LIST_CLEAR; 3033c588192SMat Martineau seq_list->tail = L2CAP_SEQ_LIST_CLEAR; 3043c588192SMat Martineau } 3053c588192SMat Martineau } else { 3063c588192SMat Martineau /* Walk the list to find the sequence number */ 3073c588192SMat Martineau u16 prev = seq_list->head; 3083c588192SMat Martineau while (seq_list->list[prev & mask] != seq) { 3093c588192SMat Martineau prev = seq_list->list[prev & mask]; 3103c588192SMat Martineau if (prev == L2CAP_SEQ_LIST_TAIL) 3113c588192SMat Martineau return L2CAP_SEQ_LIST_CLEAR; 3123c588192SMat Martineau } 3133c588192SMat Martineau 3143c588192SMat Martineau /* Unlink the number from the list and clear it */ 3153c588192SMat Martineau seq_list->list[prev & mask] = seq_list->list[seq & mask]; 3163c588192SMat Martineau seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR; 3173c588192SMat Martineau if (seq_list->tail == seq) 3183c588192SMat Martineau seq_list->tail = prev; 3193c588192SMat Martineau } 3203c588192SMat Martineau return seq; 3213c588192SMat Martineau } 3223c588192SMat Martineau 3233c588192SMat Martineau static inline u16 l2cap_seq_list_pop(struct l2cap_seq_list *seq_list) 3243c588192SMat Martineau { 3253c588192SMat Martineau /* Remove the head in constant time */ 3263c588192SMat Martineau return l2cap_seq_list_remove(seq_list, seq_list->head); 3273c588192SMat Martineau } 3283c588192SMat Martineau 3293c588192SMat Martineau static void l2cap_seq_list_clear(struct l2cap_seq_list *seq_list) 3303c588192SMat Martineau { 3313c588192SMat Martineau u16 i; 332f522ae36SGustavo Padovan 333f522ae36SGustavo Padovan if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) 334f522ae36SGustavo Padovan return; 335f522ae36SGustavo Padovan 3363c588192SMat Martineau for (i = 0; i <= seq_list->mask; i++) 3373c588192SMat Martineau seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; 3383c588192SMat Martineau 3393c588192SMat Martineau seq_list->head = L2CAP_SEQ_LIST_CLEAR; 3403c588192SMat Martineau seq_list->tail = L2CAP_SEQ_LIST_CLEAR; 3413c588192SMat Martineau } 3423c588192SMat Martineau 3433c588192SMat Martineau static void l2cap_seq_list_append(struct l2cap_seq_list *seq_list, u16 seq) 3443c588192SMat Martineau { 3453c588192SMat Martineau u16 mask = seq_list->mask; 3463c588192SMat Martineau 3473c588192SMat Martineau /* All appends happen in constant time */ 3483c588192SMat Martineau 349f522ae36SGustavo Padovan if (seq_list->list[seq & mask] != L2CAP_SEQ_LIST_CLEAR) 350f522ae36SGustavo Padovan return; 351f522ae36SGustavo Padovan 3523c588192SMat Martineau if (seq_list->tail == L2CAP_SEQ_LIST_CLEAR) 3533c588192SMat Martineau seq_list->head = seq; 3543c588192SMat Martineau else 3553c588192SMat Martineau seq_list->list[seq_list->tail & mask] = seq; 3563c588192SMat Martineau 3573c588192SMat Martineau seq_list->tail = seq; 3583c588192SMat Martineau seq_list->list[seq & mask] = L2CAP_SEQ_LIST_TAIL; 3593c588192SMat Martineau } 3603c588192SMat Martineau 361721c4181SGustavo F. Padovan static void l2cap_chan_timeout(struct work_struct *work) 362ab07801dSGustavo F. Padovan { 363721c4181SGustavo F. Padovan struct l2cap_chan *chan = container_of(work, struct l2cap_chan, 364721c4181SGustavo F. Padovan chan_timer.work); 3653df91ea2SAndrei Emeltchenko struct l2cap_conn *conn = chan->conn; 366ab07801dSGustavo F. Padovan int reason; 367ab07801dSGustavo F. Padovan 368e05dcc32SAndrei Emeltchenko BT_DBG("chan %p state %s", chan, state_to_string(chan->state)); 369ab07801dSGustavo F. Padovan 3703df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 3716be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 372ab07801dSGustavo F. Padovan 37389bc500eSGustavo F. Padovan if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG) 374ab07801dSGustavo F. Padovan reason = ECONNREFUSED; 37589bc500eSGustavo F. Padovan else if (chan->state == BT_CONNECT && 376ab07801dSGustavo F. Padovan chan->sec_level != BT_SECURITY_SDP) 377ab07801dSGustavo F. Padovan reason = ECONNREFUSED; 378ab07801dSGustavo F. Padovan else 379ab07801dSGustavo F. Padovan reason = ETIMEDOUT; 380ab07801dSGustavo F. Padovan 3810f852724SGustavo F. Padovan l2cap_chan_close(chan, reason); 382ab07801dSGustavo F. Padovan 3836be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 384ab07801dSGustavo F. Padovan 38580b98027SGustavo Padovan chan->ops->close(chan); 3863df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 3873df91ea2SAndrei Emeltchenko 388371fd835SUlisses Furquim l2cap_chan_put(chan); 389ab07801dSGustavo F. Padovan } 390ab07801dSGustavo F. Padovan 391eef1d9b6SGustavo Padovan struct l2cap_chan *l2cap_chan_create(void) 3920a708f8fSGustavo F. Padovan { 39348454079SGustavo F. Padovan struct l2cap_chan *chan; 3940a708f8fSGustavo F. Padovan 39548454079SGustavo F. Padovan chan = kzalloc(sizeof(*chan), GFP_ATOMIC); 39648454079SGustavo F. Padovan if (!chan) 39748454079SGustavo F. Padovan return NULL; 3980a708f8fSGustavo F. Padovan 399c03b355eSAndrei Emeltchenko mutex_init(&chan->lock); 400c03b355eSAndrei Emeltchenko 401333055f2SGustavo F. Padovan write_lock(&chan_list_lock); 40223691d75SGustavo F. Padovan list_add(&chan->global_l, &chan_list); 403333055f2SGustavo F. Padovan write_unlock(&chan_list_lock); 40423691d75SGustavo F. Padovan 405721c4181SGustavo F. Padovan INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout); 406ab07801dSGustavo F. Padovan 40789bc500eSGustavo F. Padovan chan->state = BT_OPEN; 40889bc500eSGustavo F. Padovan 40971ba0e56SGustavo F. Padovan atomic_set(&chan->refcnt, 1); 41071ba0e56SGustavo F. Padovan 4112827011fSMat Martineau /* This flag is cleared in l2cap_chan_ready() */ 4122827011fSMat Martineau set_bit(CONF_NOT_COMPLETE, &chan->conf_state); 4132827011fSMat Martineau 414eef1d9b6SGustavo Padovan BT_DBG("chan %p", chan); 415abc545b8SSzymon Janc 41648454079SGustavo F. Padovan return chan; 4170a708f8fSGustavo F. Padovan } 4180a708f8fSGustavo F. Padovan 41923691d75SGustavo F. Padovan void l2cap_chan_destroy(struct l2cap_chan *chan) 4206ff5abbfSGustavo F. Padovan { 421333055f2SGustavo F. Padovan write_lock(&chan_list_lock); 42223691d75SGustavo F. Padovan list_del(&chan->global_l); 423333055f2SGustavo F. Padovan write_unlock(&chan_list_lock); 42423691d75SGustavo F. Padovan 425371fd835SUlisses Furquim l2cap_chan_put(chan); 4266ff5abbfSGustavo F. Padovan } 4276ff5abbfSGustavo F. Padovan 428bd4b1653SAndrei Emeltchenko void l2cap_chan_set_defaults(struct l2cap_chan *chan) 429bd4b1653SAndrei Emeltchenko { 430bd4b1653SAndrei Emeltchenko chan->fcs = L2CAP_FCS_CRC16; 431bd4b1653SAndrei Emeltchenko chan->max_tx = L2CAP_DEFAULT_MAX_TX; 432bd4b1653SAndrei Emeltchenko chan->tx_win = L2CAP_DEFAULT_TX_WINDOW; 433bd4b1653SAndrei Emeltchenko chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; 434c20f8e35SMat Martineau chan->ack_win = L2CAP_DEFAULT_TX_WINDOW; 435bd4b1653SAndrei Emeltchenko chan->sec_level = BT_SECURITY_LOW; 436bd4b1653SAndrei Emeltchenko 437bd4b1653SAndrei Emeltchenko set_bit(FLAG_FORCE_ACTIVE, &chan->flags); 438bd4b1653SAndrei Emeltchenko } 439bd4b1653SAndrei Emeltchenko 44014a28491SAndrei Emeltchenko static void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) 4410a708f8fSGustavo F. Padovan { 4420a708f8fSGustavo F. Padovan BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, 443097db76cSAndrei Emeltchenko __le16_to_cpu(chan->psm), chan->dcid); 4440a708f8fSGustavo F. Padovan 4459f5a0d7bSAndrei Emeltchenko conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; 4460a708f8fSGustavo F. Padovan 4478c1d787bSGustavo F. Padovan chan->conn = conn; 4480a708f8fSGustavo F. Padovan 4495491120eSAndrei Emeltchenko switch (chan->chan_type) { 4505491120eSAndrei Emeltchenko case L2CAP_CHAN_CONN_ORIENTED: 451b62f328bSVille Tervo if (conn->hcon->type == LE_LINK) { 452b62f328bSVille Tervo /* LE connection */ 4536fcb06a2SAndre Guedes chan->omtu = L2CAP_DEFAULT_MTU; 454fe4128e0SGustavo F. Padovan chan->scid = L2CAP_CID_LE_DATA; 455fe4128e0SGustavo F. Padovan chan->dcid = L2CAP_CID_LE_DATA; 456b62f328bSVille Tervo } else { 4570a708f8fSGustavo F. Padovan /* Alloc CID for connection-oriented socket */ 458fe4128e0SGustavo F. Padovan chan->scid = l2cap_alloc_cid(conn); 4590c1bc5c6SGustavo F. Padovan chan->omtu = L2CAP_DEFAULT_MTU; 460b62f328bSVille Tervo } 4615491120eSAndrei Emeltchenko break; 4625491120eSAndrei Emeltchenko 4635491120eSAndrei Emeltchenko case L2CAP_CHAN_CONN_LESS: 4640a708f8fSGustavo F. Padovan /* Connectionless socket */ 465fe4128e0SGustavo F. Padovan chan->scid = L2CAP_CID_CONN_LESS; 466fe4128e0SGustavo F. Padovan chan->dcid = L2CAP_CID_CONN_LESS; 4670c1bc5c6SGustavo F. Padovan chan->omtu = L2CAP_DEFAULT_MTU; 4685491120eSAndrei Emeltchenko break; 4695491120eSAndrei Emeltchenko 470416fa752SAndrei Emeltchenko case L2CAP_CHAN_CONN_FIX_A2MP: 471416fa752SAndrei Emeltchenko chan->scid = L2CAP_CID_A2MP; 472416fa752SAndrei Emeltchenko chan->dcid = L2CAP_CID_A2MP; 473416fa752SAndrei Emeltchenko chan->omtu = L2CAP_A2MP_DEFAULT_MTU; 474416fa752SAndrei Emeltchenko chan->imtu = L2CAP_A2MP_DEFAULT_MTU; 475416fa752SAndrei Emeltchenko break; 476416fa752SAndrei Emeltchenko 4775491120eSAndrei Emeltchenko default: 4780a708f8fSGustavo F. Padovan /* Raw socket can send/recv signalling messages only */ 479fe4128e0SGustavo F. Padovan chan->scid = L2CAP_CID_SIGNALING; 480fe4128e0SGustavo F. Padovan chan->dcid = L2CAP_CID_SIGNALING; 4810c1bc5c6SGustavo F. Padovan chan->omtu = L2CAP_DEFAULT_MTU; 4820a708f8fSGustavo F. Padovan } 4830a708f8fSGustavo F. Padovan 4848f7975b1SAndrei Emeltchenko chan->local_id = L2CAP_BESTEFFORT_ID; 4858f7975b1SAndrei Emeltchenko chan->local_stype = L2CAP_SERV_BESTEFFORT; 4868f7975b1SAndrei Emeltchenko chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE; 4878f7975b1SAndrei Emeltchenko chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME; 4888f7975b1SAndrei Emeltchenko chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT; 4898f7975b1SAndrei Emeltchenko chan->local_flush_to = L2CAP_DEFAULT_FLUSH_TO; 4908f7975b1SAndrei Emeltchenko 491371fd835SUlisses Furquim l2cap_chan_hold(chan); 492baa7e1faSGustavo F. Padovan 4933df91ea2SAndrei Emeltchenko list_add(&chan->list, &conn->chan_l); 494643162a8SAndrei Emeltchenko } 495643162a8SAndrei Emeltchenko 496466f8004SAndrei Emeltchenko void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) 497643162a8SAndrei Emeltchenko { 498643162a8SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 499643162a8SAndrei Emeltchenko __l2cap_chan_add(conn, chan); 5003df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 5010a708f8fSGustavo F. Padovan } 5020a708f8fSGustavo F. Padovan 503466f8004SAndrei Emeltchenko void l2cap_chan_del(struct l2cap_chan *chan, int err) 5040a708f8fSGustavo F. Padovan { 5058c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 5060a708f8fSGustavo F. Padovan 507c9b66675SGustavo F. Padovan __clear_chan_timer(chan); 5080a708f8fSGustavo F. Padovan 50949208c9cSGustavo F. Padovan BT_DBG("chan %p, conn %p, err %d", chan, conn, err); 5100a708f8fSGustavo F. Padovan 5110a708f8fSGustavo F. Padovan if (conn) { 512baa7e1faSGustavo F. Padovan /* Delete from channel list */ 5133df91ea2SAndrei Emeltchenko list_del(&chan->list); 5143d57dc68SGustavo F. Padovan 515371fd835SUlisses Furquim l2cap_chan_put(chan); 516baa7e1faSGustavo F. Padovan 5178c1d787bSGustavo F. Padovan chan->conn = NULL; 5183cabbfdaSAndrei Emeltchenko 5193cabbfdaSAndrei Emeltchenko if (chan->chan_type != L2CAP_CHAN_CONN_FIX_A2MP) 5200a708f8fSGustavo F. Padovan hci_conn_put(conn->hcon); 5210a708f8fSGustavo F. Padovan } 5220a708f8fSGustavo F. Padovan 523c0df7f6eSAndrei Emeltchenko if (chan->ops->teardown) 524c0df7f6eSAndrei Emeltchenko chan->ops->teardown(chan, err); 5256be36555SAndrei Emeltchenko 5262827011fSMat Martineau if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state)) 5276ff5abbfSGustavo F. Padovan return; 5282ead70b8SGustavo F. Padovan 529ee556f66SGustavo Padovan switch(chan->mode) { 530ee556f66SGustavo Padovan case L2CAP_MODE_BASIC: 531ee556f66SGustavo Padovan break; 5320a708f8fSGustavo F. Padovan 533ee556f66SGustavo Padovan case L2CAP_MODE_ERTM: 5341a09bcb9SGustavo F. Padovan __clear_retrans_timer(chan); 5351a09bcb9SGustavo F. Padovan __clear_monitor_timer(chan); 5361a09bcb9SGustavo F. Padovan __clear_ack_timer(chan); 5370a708f8fSGustavo F. Padovan 538f1c6775bSGustavo F. Padovan skb_queue_purge(&chan->srej_q); 5390a708f8fSGustavo F. Padovan 5403c588192SMat Martineau l2cap_seq_list_free(&chan->srej_list); 5413c588192SMat Martineau l2cap_seq_list_free(&chan->retrans_list); 542ee556f66SGustavo Padovan 543ee556f66SGustavo Padovan /* fall through */ 544ee556f66SGustavo Padovan 545ee556f66SGustavo Padovan case L2CAP_MODE_STREAMING: 546ee556f66SGustavo Padovan skb_queue_purge(&chan->tx_q); 547ee556f66SGustavo Padovan break; 5480a708f8fSGustavo F. Padovan } 549ee556f66SGustavo Padovan 550ee556f66SGustavo Padovan return; 5510a708f8fSGustavo F. Padovan } 5520a708f8fSGustavo F. Padovan 5530f852724SGustavo F. Padovan void l2cap_chan_close(struct l2cap_chan *chan, int reason) 5544519de9aSGustavo F. Padovan { 5554519de9aSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 5564519de9aSGustavo F. Padovan struct sock *sk = chan->sk; 5574519de9aSGustavo F. Padovan 558e05dcc32SAndrei Emeltchenko BT_DBG("chan %p state %s sk %p", chan, 559e05dcc32SAndrei Emeltchenko state_to_string(chan->state), sk); 5604519de9aSGustavo F. Padovan 56189bc500eSGustavo F. Padovan switch (chan->state) { 5624519de9aSGustavo F. Padovan case BT_LISTEN: 563c0df7f6eSAndrei Emeltchenko if (chan->ops->teardown) 564c0df7f6eSAndrei Emeltchenko chan->ops->teardown(chan, 0); 5654519de9aSGustavo F. Padovan break; 5664519de9aSGustavo F. Padovan 5674519de9aSGustavo F. Padovan case BT_CONNECTED: 5684519de9aSGustavo F. Padovan case BT_CONFIG: 569715ec005SGustavo F. Padovan if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && 5704519de9aSGustavo F. Padovan conn->hcon->type == ACL_LINK) { 571c9b66675SGustavo F. Padovan __set_chan_timer(chan, sk->sk_sndtimeo); 5724519de9aSGustavo F. Padovan l2cap_send_disconn_req(conn, chan, reason); 5734519de9aSGustavo F. Padovan } else 5744519de9aSGustavo F. Padovan l2cap_chan_del(chan, reason); 5754519de9aSGustavo F. Padovan break; 5764519de9aSGustavo F. Padovan 5774519de9aSGustavo F. Padovan case BT_CONNECT2: 578715ec005SGustavo F. Padovan if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && 5794519de9aSGustavo F. Padovan conn->hcon->type == ACL_LINK) { 5804519de9aSGustavo F. Padovan struct l2cap_conn_rsp rsp; 5814519de9aSGustavo F. Padovan __u16 result; 5824519de9aSGustavo F. Padovan 583c5daa683SGustavo Padovan if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) 5844519de9aSGustavo F. Padovan result = L2CAP_CR_SEC_BLOCK; 5854519de9aSGustavo F. Padovan else 5864519de9aSGustavo F. Padovan result = L2CAP_CR_BAD_PSM; 58789bc500eSGustavo F. Padovan l2cap_state_change(chan, BT_DISCONN); 5884519de9aSGustavo F. Padovan 5894519de9aSGustavo F. Padovan rsp.scid = cpu_to_le16(chan->dcid); 5904519de9aSGustavo F. Padovan rsp.dcid = cpu_to_le16(chan->scid); 5914519de9aSGustavo F. Padovan rsp.result = cpu_to_le16(result); 592ac73498cSAndrei Emeltchenko rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); 5934519de9aSGustavo F. Padovan l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, 5944519de9aSGustavo F. Padovan sizeof(rsp), &rsp); 5954519de9aSGustavo F. Padovan } 5964519de9aSGustavo F. Padovan 5974519de9aSGustavo F. Padovan l2cap_chan_del(chan, reason); 5984519de9aSGustavo F. Padovan break; 5994519de9aSGustavo F. Padovan 6004519de9aSGustavo F. Padovan case BT_CONNECT: 6014519de9aSGustavo F. Padovan case BT_DISCONN: 6024519de9aSGustavo F. Padovan l2cap_chan_del(chan, reason); 6034519de9aSGustavo F. Padovan break; 6044519de9aSGustavo F. Padovan 6054519de9aSGustavo F. Padovan default: 606c0df7f6eSAndrei Emeltchenko if (chan->ops->teardown) 607c0df7f6eSAndrei Emeltchenko chan->ops->teardown(chan, 0); 6084519de9aSGustavo F. Padovan break; 6094519de9aSGustavo F. Padovan } 6104519de9aSGustavo F. Padovan } 6114519de9aSGustavo F. Padovan 6124343478fSGustavo F. Padovan static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan) 6130a708f8fSGustavo F. Padovan { 614715ec005SGustavo F. Padovan if (chan->chan_type == L2CAP_CHAN_RAW) { 6154343478fSGustavo F. Padovan switch (chan->sec_level) { 6160a708f8fSGustavo F. Padovan case BT_SECURITY_HIGH: 6170a708f8fSGustavo F. Padovan return HCI_AT_DEDICATED_BONDING_MITM; 6180a708f8fSGustavo F. Padovan case BT_SECURITY_MEDIUM: 6190a708f8fSGustavo F. Padovan return HCI_AT_DEDICATED_BONDING; 6200a708f8fSGustavo F. Padovan default: 6210a708f8fSGustavo F. Padovan return HCI_AT_NO_BONDING; 6220a708f8fSGustavo F. Padovan } 6232983fd68SAndrei Emeltchenko } else if (chan->psm == __constant_cpu_to_le16(L2CAP_PSM_SDP)) { 6244343478fSGustavo F. Padovan if (chan->sec_level == BT_SECURITY_LOW) 6254343478fSGustavo F. Padovan chan->sec_level = BT_SECURITY_SDP; 6260a708f8fSGustavo F. Padovan 6274343478fSGustavo F. Padovan if (chan->sec_level == BT_SECURITY_HIGH) 6280a708f8fSGustavo F. Padovan return HCI_AT_NO_BONDING_MITM; 6290a708f8fSGustavo F. Padovan else 6300a708f8fSGustavo F. Padovan return HCI_AT_NO_BONDING; 6310a708f8fSGustavo F. Padovan } else { 6324343478fSGustavo F. Padovan switch (chan->sec_level) { 6330a708f8fSGustavo F. Padovan case BT_SECURITY_HIGH: 6340a708f8fSGustavo F. Padovan return HCI_AT_GENERAL_BONDING_MITM; 6350a708f8fSGustavo F. Padovan case BT_SECURITY_MEDIUM: 6360a708f8fSGustavo F. Padovan return HCI_AT_GENERAL_BONDING; 6370a708f8fSGustavo F. Padovan default: 6380a708f8fSGustavo F. Padovan return HCI_AT_NO_BONDING; 6390a708f8fSGustavo F. Padovan } 6400a708f8fSGustavo F. Padovan } 6410a708f8fSGustavo F. Padovan } 6420a708f8fSGustavo F. Padovan 6430a708f8fSGustavo F. Padovan /* Service level security */ 644d45fc423SGustavo F. Padovan int l2cap_chan_check_security(struct l2cap_chan *chan) 6450a708f8fSGustavo F. Padovan { 6468c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 6470a708f8fSGustavo F. Padovan __u8 auth_type; 6480a708f8fSGustavo F. Padovan 6494343478fSGustavo F. Padovan auth_type = l2cap_get_auth_type(chan); 6500a708f8fSGustavo F. Padovan 6514343478fSGustavo F. Padovan return hci_conn_security(conn->hcon, chan->sec_level, auth_type); 6520a708f8fSGustavo F. Padovan } 6530a708f8fSGustavo F. Padovan 654b5ad8b7fSJohannes Berg static u8 l2cap_get_ident(struct l2cap_conn *conn) 6550a708f8fSGustavo F. Padovan { 6560a708f8fSGustavo F. Padovan u8 id; 6570a708f8fSGustavo F. Padovan 6580a708f8fSGustavo F. Padovan /* Get next available identificator. 6590a708f8fSGustavo F. Padovan * 1 - 128 are used by kernel. 6600a708f8fSGustavo F. Padovan * 129 - 199 are reserved. 6610a708f8fSGustavo F. Padovan * 200 - 254 are used by utilities like l2ping, etc. 6620a708f8fSGustavo F. Padovan */ 6630a708f8fSGustavo F. Padovan 664333055f2SGustavo F. Padovan spin_lock(&conn->lock); 6650a708f8fSGustavo F. Padovan 6660a708f8fSGustavo F. Padovan if (++conn->tx_ident > 128) 6670a708f8fSGustavo F. Padovan conn->tx_ident = 1; 6680a708f8fSGustavo F. Padovan 6690a708f8fSGustavo F. Padovan id = conn->tx_ident; 6700a708f8fSGustavo F. Padovan 671333055f2SGustavo F. Padovan spin_unlock(&conn->lock); 6720a708f8fSGustavo F. Padovan 6730a708f8fSGustavo F. Padovan return id; 6740a708f8fSGustavo F. Padovan } 6750a708f8fSGustavo F. Padovan 6764519de9aSGustavo F. Padovan static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data) 6770a708f8fSGustavo F. Padovan { 6780a708f8fSGustavo F. Padovan struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); 6790a708f8fSGustavo F. Padovan u8 flags; 6800a708f8fSGustavo F. Padovan 6810a708f8fSGustavo F. Padovan BT_DBG("code 0x%2.2x", code); 6820a708f8fSGustavo F. Padovan 6830a708f8fSGustavo F. Padovan if (!skb) 6840a708f8fSGustavo F. Padovan return; 6850a708f8fSGustavo F. Padovan 6860a708f8fSGustavo F. Padovan if (lmp_no_flush_capable(conn->hcon->hdev)) 6870a708f8fSGustavo F. Padovan flags = ACL_START_NO_FLUSH; 6880a708f8fSGustavo F. Padovan else 6890a708f8fSGustavo F. Padovan flags = ACL_START; 6900a708f8fSGustavo F. Padovan 69114b12d0bSJaikumar Ganesh bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON; 6925e59b791SLuiz Augusto von Dentz skb->priority = HCI_PRIO_MAX; 69314b12d0bSJaikumar Ganesh 69473d80debSLuiz Augusto von Dentz hci_send_acl(conn->hchan, skb, flags); 6950a708f8fSGustavo F. Padovan } 6960a708f8fSGustavo F. Padovan 69773d80debSLuiz Augusto von Dentz static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb) 69873d80debSLuiz Augusto von Dentz { 69973d80debSLuiz Augusto von Dentz struct hci_conn *hcon = chan->conn->hcon; 70073d80debSLuiz Augusto von Dentz u16 flags; 70173d80debSLuiz Augusto von Dentz 70273d80debSLuiz Augusto von Dentz BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len, 70373d80debSLuiz Augusto von Dentz skb->priority); 70473d80debSLuiz Augusto von Dentz 70573d80debSLuiz Augusto von Dentz if (!test_bit(FLAG_FLUSHABLE, &chan->flags) && 70673d80debSLuiz Augusto von Dentz lmp_no_flush_capable(hcon->hdev)) 70773d80debSLuiz Augusto von Dentz flags = ACL_START_NO_FLUSH; 70873d80debSLuiz Augusto von Dentz else 70973d80debSLuiz Augusto von Dentz flags = ACL_START; 71073d80debSLuiz Augusto von Dentz 71173d80debSLuiz Augusto von Dentz bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags); 71273d80debSLuiz Augusto von Dentz hci_send_acl(chan->conn->hchan, skb, flags); 7130a708f8fSGustavo F. Padovan } 7140a708f8fSGustavo F. Padovan 715b5c6aaedSMat Martineau static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control) 716b5c6aaedSMat Martineau { 717b5c6aaedSMat Martineau control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT; 718b5c6aaedSMat Martineau control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT; 719b5c6aaedSMat Martineau 720b5c6aaedSMat Martineau if (enh & L2CAP_CTRL_FRAME_TYPE) { 721b5c6aaedSMat Martineau /* S-Frame */ 722b5c6aaedSMat Martineau control->sframe = 1; 723b5c6aaedSMat Martineau control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT; 724b5c6aaedSMat Martineau control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT; 725b5c6aaedSMat Martineau 726b5c6aaedSMat Martineau control->sar = 0; 727b5c6aaedSMat Martineau control->txseq = 0; 728b5c6aaedSMat Martineau } else { 729b5c6aaedSMat Martineau /* I-Frame */ 730b5c6aaedSMat Martineau control->sframe = 0; 731b5c6aaedSMat Martineau control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT; 732b5c6aaedSMat Martineau control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT; 733b5c6aaedSMat Martineau 734b5c6aaedSMat Martineau control->poll = 0; 735b5c6aaedSMat Martineau control->super = 0; 736b5c6aaedSMat Martineau } 737b5c6aaedSMat Martineau } 738b5c6aaedSMat Martineau 739b5c6aaedSMat Martineau static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control) 740b5c6aaedSMat Martineau { 741b5c6aaedSMat Martineau control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT; 742b5c6aaedSMat Martineau control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT; 743b5c6aaedSMat Martineau 744b5c6aaedSMat Martineau if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) { 745b5c6aaedSMat Martineau /* S-Frame */ 746b5c6aaedSMat Martineau control->sframe = 1; 747b5c6aaedSMat Martineau control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT; 748b5c6aaedSMat Martineau control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT; 749b5c6aaedSMat Martineau 750b5c6aaedSMat Martineau control->sar = 0; 751b5c6aaedSMat Martineau control->txseq = 0; 752b5c6aaedSMat Martineau } else { 753b5c6aaedSMat Martineau /* I-Frame */ 754b5c6aaedSMat Martineau control->sframe = 0; 755b5c6aaedSMat Martineau control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT; 756b5c6aaedSMat Martineau control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT; 757b5c6aaedSMat Martineau 758b5c6aaedSMat Martineau control->poll = 0; 759b5c6aaedSMat Martineau control->super = 0; 760b5c6aaedSMat Martineau } 761b5c6aaedSMat Martineau } 762b5c6aaedSMat Martineau 763b5c6aaedSMat Martineau static inline void __unpack_control(struct l2cap_chan *chan, 764b5c6aaedSMat Martineau struct sk_buff *skb) 765b5c6aaedSMat Martineau { 766b5c6aaedSMat Martineau if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { 767b5c6aaedSMat Martineau __unpack_extended_control(get_unaligned_le32(skb->data), 768b5c6aaedSMat Martineau &bt_cb(skb)->control); 769cec8ab6eSMat Martineau skb_pull(skb, L2CAP_EXT_CTRL_SIZE); 770b5c6aaedSMat Martineau } else { 771b5c6aaedSMat Martineau __unpack_enhanced_control(get_unaligned_le16(skb->data), 772b5c6aaedSMat Martineau &bt_cb(skb)->control); 773cec8ab6eSMat Martineau skb_pull(skb, L2CAP_ENH_CTRL_SIZE); 774b5c6aaedSMat Martineau } 775b5c6aaedSMat Martineau } 776b5c6aaedSMat Martineau 777b5c6aaedSMat Martineau static u32 __pack_extended_control(struct l2cap_ctrl *control) 778b5c6aaedSMat Martineau { 779b5c6aaedSMat Martineau u32 packed; 780b5c6aaedSMat Martineau 781b5c6aaedSMat Martineau packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT; 782b5c6aaedSMat Martineau packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT; 783b5c6aaedSMat Martineau 784b5c6aaedSMat Martineau if (control->sframe) { 785b5c6aaedSMat Martineau packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT; 786b5c6aaedSMat Martineau packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT; 787b5c6aaedSMat Martineau packed |= L2CAP_EXT_CTRL_FRAME_TYPE; 788b5c6aaedSMat Martineau } else { 789b5c6aaedSMat Martineau packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT; 790b5c6aaedSMat Martineau packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT; 791b5c6aaedSMat Martineau } 792b5c6aaedSMat Martineau 793b5c6aaedSMat Martineau return packed; 794b5c6aaedSMat Martineau } 795b5c6aaedSMat Martineau 796b5c6aaedSMat Martineau static u16 __pack_enhanced_control(struct l2cap_ctrl *control) 797b5c6aaedSMat Martineau { 798b5c6aaedSMat Martineau u16 packed; 799b5c6aaedSMat Martineau 800b5c6aaedSMat Martineau packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT; 801b5c6aaedSMat Martineau packed |= control->final << L2CAP_CTRL_FINAL_SHIFT; 802b5c6aaedSMat Martineau 803b5c6aaedSMat Martineau if (control->sframe) { 804b5c6aaedSMat Martineau packed |= control->poll << L2CAP_CTRL_POLL_SHIFT; 805b5c6aaedSMat Martineau packed |= control->super << L2CAP_CTRL_SUPER_SHIFT; 806b5c6aaedSMat Martineau packed |= L2CAP_CTRL_FRAME_TYPE; 807b5c6aaedSMat Martineau } else { 808b5c6aaedSMat Martineau packed |= control->sar << L2CAP_CTRL_SAR_SHIFT; 809b5c6aaedSMat Martineau packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT; 810b5c6aaedSMat Martineau } 811b5c6aaedSMat Martineau 812b5c6aaedSMat Martineau return packed; 813b5c6aaedSMat Martineau } 814b5c6aaedSMat Martineau 815b5c6aaedSMat Martineau static inline void __pack_control(struct l2cap_chan *chan, 816b5c6aaedSMat Martineau struct l2cap_ctrl *control, 817b5c6aaedSMat Martineau struct sk_buff *skb) 818b5c6aaedSMat Martineau { 819b5c6aaedSMat Martineau if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { 820b5c6aaedSMat Martineau put_unaligned_le32(__pack_extended_control(control), 821b5c6aaedSMat Martineau skb->data + L2CAP_HDR_SIZE); 822b5c6aaedSMat Martineau } else { 823b5c6aaedSMat Martineau put_unaligned_le16(__pack_enhanced_control(control), 824b5c6aaedSMat Martineau skb->data + L2CAP_HDR_SIZE); 825b5c6aaedSMat Martineau } 826b5c6aaedSMat Martineau } 827b5c6aaedSMat Martineau 828ba7aa64fSGustavo Padovan static inline unsigned int __ertm_hdr_size(struct l2cap_chan *chan) 829ba7aa64fSGustavo Padovan { 830ba7aa64fSGustavo Padovan if (test_bit(FLAG_EXT_CTRL, &chan->flags)) 831ba7aa64fSGustavo Padovan return L2CAP_EXT_HDR_SIZE; 832ba7aa64fSGustavo Padovan else 833ba7aa64fSGustavo Padovan return L2CAP_ENH_HDR_SIZE; 834ba7aa64fSGustavo Padovan } 835ba7aa64fSGustavo Padovan 836a67d7f6fSMat Martineau static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan, 837a67d7f6fSMat Martineau u32 control) 8380a708f8fSGustavo F. Padovan { 8390a708f8fSGustavo F. Padovan struct sk_buff *skb; 8400a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 841ba7aa64fSGustavo Padovan int hlen = __ertm_hdr_size(chan); 8420a708f8fSGustavo F. Padovan 8430a708f8fSGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) 84403a51213SAndrei Emeltchenko hlen += L2CAP_FCS_SIZE; 8450a708f8fSGustavo F. Padovan 846a67d7f6fSMat Martineau skb = bt_skb_alloc(hlen, GFP_KERNEL); 8470a708f8fSGustavo F. Padovan 8480a708f8fSGustavo F. Padovan if (!skb) 849a67d7f6fSMat Martineau return ERR_PTR(-ENOMEM); 8500a708f8fSGustavo F. Padovan 8510a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 8520a708f8fSGustavo F. Padovan lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); 853fe4128e0SGustavo F. Padovan lh->cid = cpu_to_le16(chan->dcid); 85488843ab0SAndrei Emeltchenko 855a67d7f6fSMat Martineau if (test_bit(FLAG_EXT_CTRL, &chan->flags)) 856a67d7f6fSMat Martineau put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); 857a67d7f6fSMat Martineau else 858a67d7f6fSMat Martineau put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); 8590a708f8fSGustavo F. Padovan 86047d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) { 861a67d7f6fSMat Martineau u16 fcs = crc16(0, (u8 *)skb->data, skb->len); 86203a51213SAndrei Emeltchenko put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); 8630a708f8fSGustavo F. Padovan } 8640a708f8fSGustavo F. Padovan 86573d80debSLuiz Augusto von Dentz skb->priority = HCI_PRIO_MAX; 866a67d7f6fSMat Martineau return skb; 867a67d7f6fSMat Martineau } 868a67d7f6fSMat Martineau 869a67d7f6fSMat Martineau static void l2cap_send_sframe(struct l2cap_chan *chan, 870a67d7f6fSMat Martineau struct l2cap_ctrl *control) 871a67d7f6fSMat Martineau { 872a67d7f6fSMat Martineau struct sk_buff *skb; 873a67d7f6fSMat Martineau u32 control_field; 874a67d7f6fSMat Martineau 875a67d7f6fSMat Martineau BT_DBG("chan %p, control %p", chan, control); 876a67d7f6fSMat Martineau 877a67d7f6fSMat Martineau if (!control->sframe) 878a67d7f6fSMat Martineau return; 879a67d7f6fSMat Martineau 880a67d7f6fSMat Martineau if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) && 881a67d7f6fSMat Martineau !control->poll) 882a67d7f6fSMat Martineau control->final = 1; 883a67d7f6fSMat Martineau 884a67d7f6fSMat Martineau if (control->super == L2CAP_SUPER_RR) 885a67d7f6fSMat Martineau clear_bit(CONN_RNR_SENT, &chan->conn_state); 886a67d7f6fSMat Martineau else if (control->super == L2CAP_SUPER_RNR) 887a67d7f6fSMat Martineau set_bit(CONN_RNR_SENT, &chan->conn_state); 888a67d7f6fSMat Martineau 889a67d7f6fSMat Martineau if (control->super != L2CAP_SUPER_SREJ) { 890a67d7f6fSMat Martineau chan->last_acked_seq = control->reqseq; 891a67d7f6fSMat Martineau __clear_ack_timer(chan); 892a67d7f6fSMat Martineau } 893a67d7f6fSMat Martineau 894a67d7f6fSMat Martineau BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq, 895a67d7f6fSMat Martineau control->final, control->poll, control->super); 896a67d7f6fSMat Martineau 897a67d7f6fSMat Martineau if (test_bit(FLAG_EXT_CTRL, &chan->flags)) 898a67d7f6fSMat Martineau control_field = __pack_extended_control(control); 899a67d7f6fSMat Martineau else 900a67d7f6fSMat Martineau control_field = __pack_enhanced_control(control); 901a67d7f6fSMat Martineau 902a67d7f6fSMat Martineau skb = l2cap_create_sframe_pdu(chan, control_field); 903a67d7f6fSMat Martineau if (!IS_ERR(skb)) 90473d80debSLuiz Augusto von Dentz l2cap_do_send(chan, skb); 9050a708f8fSGustavo F. Padovan } 9060a708f8fSGustavo F. Padovan 907c9e3d5e0SMat Martineau static void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, bool poll) 9080a708f8fSGustavo F. Padovan { 909c9e3d5e0SMat Martineau struct l2cap_ctrl control; 9100a708f8fSGustavo F. Padovan 911c9e3d5e0SMat Martineau BT_DBG("chan %p, poll %d", chan, poll); 912c9e3d5e0SMat Martineau 913c9e3d5e0SMat Martineau memset(&control, 0, sizeof(control)); 914c9e3d5e0SMat Martineau control.sframe = 1; 915c9e3d5e0SMat Martineau control.poll = poll; 916c9e3d5e0SMat Martineau 917c9e3d5e0SMat Martineau if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) 918c9e3d5e0SMat Martineau control.super = L2CAP_SUPER_RNR; 919c9e3d5e0SMat Martineau else 920c9e3d5e0SMat Martineau control.super = L2CAP_SUPER_RR; 921c9e3d5e0SMat Martineau 922c9e3d5e0SMat Martineau control.reqseq = chan->buffer_seq; 923c9e3d5e0SMat Martineau l2cap_send_sframe(chan, &control); 9240a708f8fSGustavo F. Padovan } 9250a708f8fSGustavo F. Padovan 926b4450035SGustavo F. Padovan static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan) 9270a708f8fSGustavo F. Padovan { 928c1360a1cSGustavo F. Padovan return !test_bit(CONF_CONNECT_PEND, &chan->conf_state); 9290a708f8fSGustavo F. Padovan } 9300a708f8fSGustavo F. Padovan 9319b27f350SAndrei Emeltchenko static void l2cap_send_conn_req(struct l2cap_chan *chan) 9329b27f350SAndrei Emeltchenko { 9339b27f350SAndrei Emeltchenko struct l2cap_conn *conn = chan->conn; 9349b27f350SAndrei Emeltchenko struct l2cap_conn_req req; 9359b27f350SAndrei Emeltchenko 9369b27f350SAndrei Emeltchenko req.scid = cpu_to_le16(chan->scid); 9379b27f350SAndrei Emeltchenko req.psm = chan->psm; 9389b27f350SAndrei Emeltchenko 9399b27f350SAndrei Emeltchenko chan->ident = l2cap_get_ident(conn); 9409b27f350SAndrei Emeltchenko 9419b27f350SAndrei Emeltchenko set_bit(CONF_CONNECT_PEND, &chan->conf_state); 9429b27f350SAndrei Emeltchenko 9439b27f350SAndrei Emeltchenko l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req); 9449b27f350SAndrei Emeltchenko } 9459b27f350SAndrei Emeltchenko 9469f0caeb1SVinicius Costa Gomes static void l2cap_chan_ready(struct l2cap_chan *chan) 9479f0caeb1SVinicius Costa Gomes { 9482827011fSMat Martineau /* This clears all conf flags, including CONF_NOT_COMPLETE */ 9499f0caeb1SVinicius Costa Gomes chan->conf_state = 0; 9509f0caeb1SVinicius Costa Gomes __clear_chan_timer(chan); 9519f0caeb1SVinicius Costa Gomes 95254a59aa2SAndrei Emeltchenko chan->state = BT_CONNECTED; 9539f0caeb1SVinicius Costa Gomes 95454a59aa2SAndrei Emeltchenko chan->ops->ready(chan); 9559f0caeb1SVinicius Costa Gomes } 9569f0caeb1SVinicius Costa Gomes 957fc7f8a7eSGustavo F. Padovan static void l2cap_do_start(struct l2cap_chan *chan) 9580a708f8fSGustavo F. Padovan { 9598c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 9600a708f8fSGustavo F. Padovan 9619f0caeb1SVinicius Costa Gomes if (conn->hcon->type == LE_LINK) { 9629f0caeb1SVinicius Costa Gomes l2cap_chan_ready(chan); 9639f0caeb1SVinicius Costa Gomes return; 9649f0caeb1SVinicius Costa Gomes } 9659f0caeb1SVinicius Costa Gomes 9660a708f8fSGustavo F. Padovan if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { 9670a708f8fSGustavo F. Padovan if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) 9680a708f8fSGustavo F. Padovan return; 9690a708f8fSGustavo F. Padovan 970d45fc423SGustavo F. Padovan if (l2cap_chan_check_security(chan) && 9719b27f350SAndrei Emeltchenko __l2cap_no_conn_pending(chan)) 9729b27f350SAndrei Emeltchenko l2cap_send_conn_req(chan); 9730a708f8fSGustavo F. Padovan } else { 9740a708f8fSGustavo F. Padovan struct l2cap_info_req req; 975ac73498cSAndrei Emeltchenko req.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); 9760a708f8fSGustavo F. Padovan 9770a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; 9780a708f8fSGustavo F. Padovan conn->info_ident = l2cap_get_ident(conn); 9790a708f8fSGustavo F. Padovan 980ba13ccd9SMarcel Holtmann schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); 9810a708f8fSGustavo F. Padovan 9820a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, conn->info_ident, 9830a708f8fSGustavo F. Padovan L2CAP_INFO_REQ, sizeof(req), &req); 9840a708f8fSGustavo F. Padovan } 9850a708f8fSGustavo F. Padovan } 9860a708f8fSGustavo F. Padovan 9870a708f8fSGustavo F. Padovan static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) 9880a708f8fSGustavo F. Padovan { 9890a708f8fSGustavo F. Padovan u32 local_feat_mask = l2cap_feat_mask; 9900a708f8fSGustavo F. Padovan if (!disable_ertm) 9910a708f8fSGustavo F. Padovan local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; 9920a708f8fSGustavo F. Padovan 9930a708f8fSGustavo F. Padovan switch (mode) { 9940a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 9950a708f8fSGustavo F. Padovan return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; 9960a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 9970a708f8fSGustavo F. Padovan return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; 9980a708f8fSGustavo F. Padovan default: 9990a708f8fSGustavo F. Padovan return 0x00; 10000a708f8fSGustavo F. Padovan } 10010a708f8fSGustavo F. Padovan } 10020a708f8fSGustavo F. Padovan 10034519de9aSGustavo F. Padovan static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct l2cap_chan *chan, int err) 10040a708f8fSGustavo F. Padovan { 10056be36555SAndrei Emeltchenko struct sock *sk = chan->sk; 10060a708f8fSGustavo F. Padovan struct l2cap_disconn_req req; 10070a708f8fSGustavo F. Padovan 10080a708f8fSGustavo F. Padovan if (!conn) 10090a708f8fSGustavo F. Padovan return; 10100a708f8fSGustavo F. Padovan 10110c1bc5c6SGustavo F. Padovan if (chan->mode == L2CAP_MODE_ERTM) { 10121a09bcb9SGustavo F. Padovan __clear_retrans_timer(chan); 10131a09bcb9SGustavo F. Padovan __clear_monitor_timer(chan); 10141a09bcb9SGustavo F. Padovan __clear_ack_timer(chan); 10150a708f8fSGustavo F. Padovan } 10160a708f8fSGustavo F. Padovan 1017416fa752SAndrei Emeltchenko if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) { 1018416fa752SAndrei Emeltchenko __l2cap_state_change(chan, BT_DISCONN); 1019416fa752SAndrei Emeltchenko return; 1020416fa752SAndrei Emeltchenko } 1021416fa752SAndrei Emeltchenko 1022fe4128e0SGustavo F. Padovan req.dcid = cpu_to_le16(chan->dcid); 1023fe4128e0SGustavo F. Padovan req.scid = cpu_to_le16(chan->scid); 10240a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), 10250a708f8fSGustavo F. Padovan L2CAP_DISCONN_REQ, sizeof(req), &req); 10260a708f8fSGustavo F. Padovan 10276be36555SAndrei Emeltchenko lock_sock(sk); 10280e587be7SAndrei Emeltchenko __l2cap_state_change(chan, BT_DISCONN); 10292e0052e4SAndrei Emeltchenko __l2cap_chan_set_err(chan, err); 10306be36555SAndrei Emeltchenko release_sock(sk); 10310a708f8fSGustavo F. Padovan } 10320a708f8fSGustavo F. Padovan 10330a708f8fSGustavo F. Padovan /* ---- L2CAP connections ---- */ 10340a708f8fSGustavo F. Padovan static void l2cap_conn_start(struct l2cap_conn *conn) 10350a708f8fSGustavo F. Padovan { 10363df91ea2SAndrei Emeltchenko struct l2cap_chan *chan, *tmp; 10370a708f8fSGustavo F. Padovan 10380a708f8fSGustavo F. Padovan BT_DBG("conn %p", conn); 10390a708f8fSGustavo F. Padovan 10403df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 10410a708f8fSGustavo F. Padovan 10423df91ea2SAndrei Emeltchenko list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { 104348454079SGustavo F. Padovan struct sock *sk = chan->sk; 1044baa7e1faSGustavo F. Padovan 10456be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 10460a708f8fSGustavo F. Padovan 1047715ec005SGustavo F. Padovan if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { 10486be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 10490a708f8fSGustavo F. Padovan continue; 10500a708f8fSGustavo F. Padovan } 10510a708f8fSGustavo F. Padovan 105289bc500eSGustavo F. Padovan if (chan->state == BT_CONNECT) { 1053d45fc423SGustavo F. Padovan if (!l2cap_chan_check_security(chan) || 1054b4450035SGustavo F. Padovan !__l2cap_no_conn_pending(chan)) { 10556be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 10560a708f8fSGustavo F. Padovan continue; 10570a708f8fSGustavo F. Padovan } 10580a708f8fSGustavo F. Padovan 1059c1360a1cSGustavo F. Padovan if (!l2cap_mode_supported(chan->mode, conn->feat_mask) 1060c1360a1cSGustavo F. Padovan && test_bit(CONF_STATE2_DEVICE, 1061c1360a1cSGustavo F. Padovan &chan->conf_state)) { 10620f852724SGustavo F. Padovan l2cap_chan_close(chan, ECONNRESET); 10636be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 10640a708f8fSGustavo F. Padovan continue; 10650a708f8fSGustavo F. Padovan } 10660a708f8fSGustavo F. Padovan 10679b27f350SAndrei Emeltchenko l2cap_send_conn_req(chan); 10680a708f8fSGustavo F. Padovan 106989bc500eSGustavo F. Padovan } else if (chan->state == BT_CONNECT2) { 10700a708f8fSGustavo F. Padovan struct l2cap_conn_rsp rsp; 10710a708f8fSGustavo F. Padovan char buf[128]; 1072fe4128e0SGustavo F. Padovan rsp.scid = cpu_to_le16(chan->dcid); 1073fe4128e0SGustavo F. Padovan rsp.dcid = cpu_to_le16(chan->scid); 10740a708f8fSGustavo F. Padovan 1075d45fc423SGustavo F. Padovan if (l2cap_chan_check_security(chan)) { 10766be36555SAndrei Emeltchenko lock_sock(sk); 1077c5daa683SGustavo Padovan if (test_bit(BT_SK_DEFER_SETUP, 1078c5daa683SGustavo Padovan &bt_sk(sk)->flags)) { 10790a708f8fSGustavo F. Padovan struct sock *parent = bt_sk(sk)->parent; 1080ac73498cSAndrei Emeltchenko rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND); 1081ac73498cSAndrei Emeltchenko rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHOR_PEND); 108205e9a2f6SIlia Kolomisnky if (parent) 10830a708f8fSGustavo F. Padovan parent->sk_data_ready(parent, 0); 10840a708f8fSGustavo F. Padovan 10850a708f8fSGustavo F. Padovan } else { 10860e587be7SAndrei Emeltchenko __l2cap_state_change(chan, BT_CONFIG); 1087ac73498cSAndrei Emeltchenko rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS); 1088ac73498cSAndrei Emeltchenko rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); 10890a708f8fSGustavo F. Padovan } 10906be36555SAndrei Emeltchenko release_sock(sk); 10910a708f8fSGustavo F. Padovan } else { 1092ac73498cSAndrei Emeltchenko rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND); 1093ac73498cSAndrei Emeltchenko rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHEN_PEND); 10940a708f8fSGustavo F. Padovan } 10950a708f8fSGustavo F. Padovan 1096fc7f8a7eSGustavo F. Padovan l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, 1097fc7f8a7eSGustavo F. Padovan sizeof(rsp), &rsp); 10980a708f8fSGustavo F. Padovan 1099c1360a1cSGustavo F. Padovan if (test_bit(CONF_REQ_SENT, &chan->conf_state) || 11000a708f8fSGustavo F. Padovan rsp.result != L2CAP_CR_SUCCESS) { 11016be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 11020a708f8fSGustavo F. Padovan continue; 11030a708f8fSGustavo F. Padovan } 11040a708f8fSGustavo F. Padovan 1105c1360a1cSGustavo F. Padovan set_bit(CONF_REQ_SENT, &chan->conf_state); 11060a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 110773ffa904SGustavo F. Padovan l2cap_build_conf_req(chan, buf), buf); 110873ffa904SGustavo F. Padovan chan->num_conf_req++; 11090a708f8fSGustavo F. Padovan } 11100a708f8fSGustavo F. Padovan 11116be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 11120a708f8fSGustavo F. Padovan } 11130a708f8fSGustavo F. Padovan 11143df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 11150a708f8fSGustavo F. Padovan } 11160a708f8fSGustavo F. Padovan 1117c2287681SIdo Yariv /* Find socket with cid and source/destination bdaddr. 1118b62f328bSVille Tervo * Returns closest match, locked. 1119b62f328bSVille Tervo */ 1120d9b88702SAndrei Emeltchenko static struct l2cap_chan *l2cap_global_chan_by_scid(int state, u16 cid, 1121c2287681SIdo Yariv bdaddr_t *src, 1122c2287681SIdo Yariv bdaddr_t *dst) 1123b62f328bSVille Tervo { 112423691d75SGustavo F. Padovan struct l2cap_chan *c, *c1 = NULL; 1125b62f328bSVille Tervo 112623691d75SGustavo F. Padovan read_lock(&chan_list_lock); 1127b62f328bSVille Tervo 112823691d75SGustavo F. Padovan list_for_each_entry(c, &chan_list, global_l) { 112923691d75SGustavo F. Padovan struct sock *sk = c->sk; 1130fe4128e0SGustavo F. Padovan 113189bc500eSGustavo F. Padovan if (state && c->state != state) 1132b62f328bSVille Tervo continue; 1133b62f328bSVille Tervo 113423691d75SGustavo F. Padovan if (c->scid == cid) { 1135c2287681SIdo Yariv int src_match, dst_match; 1136c2287681SIdo Yariv int src_any, dst_any; 1137c2287681SIdo Yariv 1138b62f328bSVille Tervo /* Exact match. */ 1139c2287681SIdo Yariv src_match = !bacmp(&bt_sk(sk)->src, src); 1140c2287681SIdo Yariv dst_match = !bacmp(&bt_sk(sk)->dst, dst); 1141c2287681SIdo Yariv if (src_match && dst_match) { 114223691d75SGustavo F. Padovan read_unlock(&chan_list_lock); 114323691d75SGustavo F. Padovan return c; 114423691d75SGustavo F. Padovan } 1145b62f328bSVille Tervo 1146b62f328bSVille Tervo /* Closest match */ 1147c2287681SIdo Yariv src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY); 1148c2287681SIdo Yariv dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY); 1149c2287681SIdo Yariv if ((src_match && dst_any) || (src_any && dst_match) || 1150c2287681SIdo Yariv (src_any && dst_any)) 115123691d75SGustavo F. Padovan c1 = c; 1152b62f328bSVille Tervo } 1153b62f328bSVille Tervo } 1154280f294fSGustavo F. Padovan 115523691d75SGustavo F. Padovan read_unlock(&chan_list_lock); 1156b62f328bSVille Tervo 115723691d75SGustavo F. Padovan return c1; 1158b62f328bSVille Tervo } 1159b62f328bSVille Tervo 1160b62f328bSVille Tervo static void l2cap_le_conn_ready(struct l2cap_conn *conn) 1161b62f328bSVille Tervo { 1162c916fbe4SGustavo F. Padovan struct sock *parent, *sk; 116323691d75SGustavo F. Padovan struct l2cap_chan *chan, *pchan; 1164b62f328bSVille Tervo 1165b62f328bSVille Tervo BT_DBG(""); 1166b62f328bSVille Tervo 1167b62f328bSVille Tervo /* Check if we have socket listening on cid */ 116823691d75SGustavo F. Padovan pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA, 1169c2287681SIdo Yariv conn->src, conn->dst); 117023691d75SGustavo F. Padovan if (!pchan) 1171b62f328bSVille Tervo return; 1172b62f328bSVille Tervo 117323691d75SGustavo F. Padovan parent = pchan->sk; 117423691d75SGustavo F. Padovan 1175aa2ac881SGustavo F. Padovan lock_sock(parent); 117662f3a2cfSGustavo F. Padovan 117780b98027SGustavo Padovan chan = pchan->ops->new_connection(pchan); 117880808e43SGustavo F. Padovan if (!chan) 1179b62f328bSVille Tervo goto clean; 1180b62f328bSVille Tervo 118180808e43SGustavo F. Padovan sk = chan->sk; 11825d41ce1dSGustavo F. Padovan 1183b62f328bSVille Tervo hci_conn_hold(conn->hcon); 1184a9ea3ed9SSzymon Janc conn->hcon->disc_timeout = HCI_DISCONN_TIMEOUT; 1185b62f328bSVille Tervo 1186b62f328bSVille Tervo bacpy(&bt_sk(sk)->src, conn->src); 1187b62f328bSVille Tervo bacpy(&bt_sk(sk)->dst, conn->dst); 1188b62f328bSVille Tervo 1189d1010240SGustavo F. Padovan bt_accept_enqueue(parent, sk); 1190d1010240SGustavo F. Padovan 11913d57dc68SGustavo F. Padovan l2cap_chan_add(conn, chan); 119248454079SGustavo F. Padovan 11936754e0dfSGustavo Padovan l2cap_chan_ready(chan); 1194b62f328bSVille Tervo 1195b62f328bSVille Tervo clean: 1196aa2ac881SGustavo F. Padovan release_sock(parent); 1197b62f328bSVille Tervo } 1198b62f328bSVille Tervo 11990a708f8fSGustavo F. Padovan static void l2cap_conn_ready(struct l2cap_conn *conn) 12000a708f8fSGustavo F. Padovan { 120148454079SGustavo F. Padovan struct l2cap_chan *chan; 12020a708f8fSGustavo F. Padovan 12030a708f8fSGustavo F. Padovan BT_DBG("conn %p", conn); 12040a708f8fSGustavo F. Padovan 1205b62f328bSVille Tervo if (!conn->hcon->out && conn->hcon->type == LE_LINK) 1206b62f328bSVille Tervo l2cap_le_conn_ready(conn); 1207b62f328bSVille Tervo 1208160dc6acSVinicius Costa Gomes if (conn->hcon->out && conn->hcon->type == LE_LINK) 1209160dc6acSVinicius Costa Gomes smp_conn_security(conn, conn->hcon->pending_sec_level); 1210160dc6acSVinicius Costa Gomes 12113df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 12120a708f8fSGustavo F. Padovan 12133df91ea2SAndrei Emeltchenko list_for_each_entry(chan, &conn->chan_l, list) { 1214baa7e1faSGustavo F. Padovan 12156be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 12160a708f8fSGustavo F. Padovan 1217416fa752SAndrei Emeltchenko if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) { 1218416fa752SAndrei Emeltchenko l2cap_chan_unlock(chan); 1219416fa752SAndrei Emeltchenko continue; 1220416fa752SAndrei Emeltchenko } 1221416fa752SAndrei Emeltchenko 122263128451SVinicius Costa Gomes if (conn->hcon->type == LE_LINK) { 1223b501d6a1SAnderson Briglia if (smp_conn_security(conn, chan->sec_level)) 1224cf4cd009SAndrei Emeltchenko l2cap_chan_ready(chan); 1225acd7d370SVille Tervo 122663128451SVinicius Costa Gomes } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { 12276be36555SAndrei Emeltchenko struct sock *sk = chan->sk; 1228c9b66675SGustavo F. Padovan __clear_chan_timer(chan); 12296be36555SAndrei Emeltchenko lock_sock(sk); 12300e587be7SAndrei Emeltchenko __l2cap_state_change(chan, BT_CONNECTED); 12310a708f8fSGustavo F. Padovan sk->sk_state_change(sk); 12326be36555SAndrei Emeltchenko release_sock(sk); 1233b501d6a1SAnderson Briglia 123489bc500eSGustavo F. Padovan } else if (chan->state == BT_CONNECT) 1235fc7f8a7eSGustavo F. Padovan l2cap_do_start(chan); 12360a708f8fSGustavo F. Padovan 12376be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 12380a708f8fSGustavo F. Padovan } 12390a708f8fSGustavo F. Padovan 12403df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 12410a708f8fSGustavo F. Padovan } 12420a708f8fSGustavo F. Padovan 12430a708f8fSGustavo F. Padovan /* Notify sockets that we cannot guaranty reliability anymore */ 12440a708f8fSGustavo F. Padovan static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) 12450a708f8fSGustavo F. Padovan { 124648454079SGustavo F. Padovan struct l2cap_chan *chan; 12470a708f8fSGustavo F. Padovan 12480a708f8fSGustavo F. Padovan BT_DBG("conn %p", conn); 12490a708f8fSGustavo F. Padovan 12503df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 12510a708f8fSGustavo F. Padovan 12523df91ea2SAndrei Emeltchenko list_for_each_entry(chan, &conn->chan_l, list) { 1253ecf61bdbSAndrei Emeltchenko if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags)) 12542e0052e4SAndrei Emeltchenko __l2cap_chan_set_err(chan, err); 12550a708f8fSGustavo F. Padovan } 12560a708f8fSGustavo F. Padovan 12573df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 12580a708f8fSGustavo F. Padovan } 12590a708f8fSGustavo F. Padovan 1260f878fcadSGustavo F. Padovan static void l2cap_info_timeout(struct work_struct *work) 12610a708f8fSGustavo F. Padovan { 1262f878fcadSGustavo F. Padovan struct l2cap_conn *conn = container_of(work, struct l2cap_conn, 1263030013d8SGustavo F. Padovan info_timer.work); 12640a708f8fSGustavo F. Padovan 12650a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 12660a708f8fSGustavo F. Padovan conn->info_ident = 0; 12670a708f8fSGustavo F. Padovan 12680a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 12690a708f8fSGustavo F. Padovan } 12700a708f8fSGustavo F. Padovan 12715d3de7dfSVinicius Costa Gomes static void l2cap_conn_del(struct hci_conn *hcon, int err) 12725d3de7dfSVinicius Costa Gomes { 12735d3de7dfSVinicius Costa Gomes struct l2cap_conn *conn = hcon->l2cap_data; 12745d3de7dfSVinicius Costa Gomes struct l2cap_chan *chan, *l; 12755d3de7dfSVinicius Costa Gomes 12765d3de7dfSVinicius Costa Gomes if (!conn) 12775d3de7dfSVinicius Costa Gomes return; 12785d3de7dfSVinicius Costa Gomes 12795d3de7dfSVinicius Costa Gomes BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); 12805d3de7dfSVinicius Costa Gomes 12815d3de7dfSVinicius Costa Gomes kfree_skb(conn->rx_skb); 12825d3de7dfSVinicius Costa Gomes 12833df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 12843df91ea2SAndrei Emeltchenko 12855d3de7dfSVinicius Costa Gomes /* Kill channels */ 12865d3de7dfSVinicius Costa Gomes list_for_each_entry_safe(chan, l, &conn->chan_l, list) { 128761d6ef3eSMat Martineau l2cap_chan_hold(chan); 12886be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 12896be36555SAndrei Emeltchenko 12905d3de7dfSVinicius Costa Gomes l2cap_chan_del(chan, err); 12916be36555SAndrei Emeltchenko 12926be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 12936be36555SAndrei Emeltchenko 129480b98027SGustavo Padovan chan->ops->close(chan); 129561d6ef3eSMat Martineau l2cap_chan_put(chan); 12965d3de7dfSVinicius Costa Gomes } 12975d3de7dfSVinicius Costa Gomes 12983df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 12993df91ea2SAndrei Emeltchenko 130073d80debSLuiz Augusto von Dentz hci_chan_del(conn->hchan); 130173d80debSLuiz Augusto von Dentz 13025d3de7dfSVinicius Costa Gomes if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) 1303127074bfSUlisses Furquim cancel_delayed_work_sync(&conn->info_timer); 13045d3de7dfSVinicius Costa Gomes 130551a8efd7SJohan Hedberg if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) { 1306127074bfSUlisses Furquim cancel_delayed_work_sync(&conn->security_timer); 13078aab4757SVinicius Costa Gomes smp_chan_destroy(conn); 1308d26a2345SVinicius Costa Gomes } 13095d3de7dfSVinicius Costa Gomes 13105d3de7dfSVinicius Costa Gomes hcon->l2cap_data = NULL; 13115d3de7dfSVinicius Costa Gomes kfree(conn); 13125d3de7dfSVinicius Costa Gomes } 13135d3de7dfSVinicius Costa Gomes 13146c9d42a1SGustavo F. Padovan static void security_timeout(struct work_struct *work) 13155d3de7dfSVinicius Costa Gomes { 13166c9d42a1SGustavo F. Padovan struct l2cap_conn *conn = container_of(work, struct l2cap_conn, 13176c9d42a1SGustavo F. Padovan security_timer.work); 13185d3de7dfSVinicius Costa Gomes 1319d06cc416SJohan Hedberg BT_DBG("conn %p", conn); 1320d06cc416SJohan Hedberg 1321d06cc416SJohan Hedberg if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags)) { 1322d06cc416SJohan Hedberg smp_chan_destroy(conn); 13235d3de7dfSVinicius Costa Gomes l2cap_conn_del(conn->hcon, ETIMEDOUT); 13245d3de7dfSVinicius Costa Gomes } 1325d06cc416SJohan Hedberg } 13265d3de7dfSVinicius Costa Gomes 13270a708f8fSGustavo F. Padovan static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) 13280a708f8fSGustavo F. Padovan { 13290a708f8fSGustavo F. Padovan struct l2cap_conn *conn = hcon->l2cap_data; 133073d80debSLuiz Augusto von Dentz struct hci_chan *hchan; 13310a708f8fSGustavo F. Padovan 13320a708f8fSGustavo F. Padovan if (conn || status) 13330a708f8fSGustavo F. Padovan return conn; 13340a708f8fSGustavo F. Padovan 133573d80debSLuiz Augusto von Dentz hchan = hci_chan_create(hcon); 133673d80debSLuiz Augusto von Dentz if (!hchan) 13370a708f8fSGustavo F. Padovan return NULL; 13380a708f8fSGustavo F. Padovan 133973d80debSLuiz Augusto von Dentz conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC); 134073d80debSLuiz Augusto von Dentz if (!conn) { 134173d80debSLuiz Augusto von Dentz hci_chan_del(hchan); 134273d80debSLuiz Augusto von Dentz return NULL; 134373d80debSLuiz Augusto von Dentz } 134473d80debSLuiz Augusto von Dentz 13450a708f8fSGustavo F. Padovan hcon->l2cap_data = conn; 13460a708f8fSGustavo F. Padovan conn->hcon = hcon; 134773d80debSLuiz Augusto von Dentz conn->hchan = hchan; 13480a708f8fSGustavo F. Padovan 134973d80debSLuiz Augusto von Dentz BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan); 13500a708f8fSGustavo F. Padovan 1351acd7d370SVille Tervo if (hcon->hdev->le_mtu && hcon->type == LE_LINK) 1352acd7d370SVille Tervo conn->mtu = hcon->hdev->le_mtu; 1353acd7d370SVille Tervo else 13540a708f8fSGustavo F. Padovan conn->mtu = hcon->hdev->acl_mtu; 1355acd7d370SVille Tervo 13560a708f8fSGustavo F. Padovan conn->src = &hcon->hdev->bdaddr; 13570a708f8fSGustavo F. Padovan conn->dst = &hcon->dst; 13580a708f8fSGustavo F. Padovan 13590a708f8fSGustavo F. Padovan conn->feat_mask = 0; 13600a708f8fSGustavo F. Padovan 13610a708f8fSGustavo F. Padovan spin_lock_init(&conn->lock); 13623df91ea2SAndrei Emeltchenko mutex_init(&conn->chan_lock); 1363baa7e1faSGustavo F. Padovan 1364baa7e1faSGustavo F. Padovan INIT_LIST_HEAD(&conn->chan_l); 13650a708f8fSGustavo F. Padovan 13665d3de7dfSVinicius Costa Gomes if (hcon->type == LE_LINK) 13676c9d42a1SGustavo F. Padovan INIT_DELAYED_WORK(&conn->security_timer, security_timeout); 13685d3de7dfSVinicius Costa Gomes else 1369030013d8SGustavo F. Padovan INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout); 13700a708f8fSGustavo F. Padovan 13719f5a0d7bSAndrei Emeltchenko conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; 13720a708f8fSGustavo F. Padovan 13730a708f8fSGustavo F. Padovan return conn; 13740a708f8fSGustavo F. Padovan } 13750a708f8fSGustavo F. Padovan 13760a708f8fSGustavo F. Padovan /* ---- Socket interface ---- */ 13770a708f8fSGustavo F. Padovan 1378c2287681SIdo Yariv /* Find socket with psm and source / destination bdaddr. 13790a708f8fSGustavo F. Padovan * Returns closest match. 13800a708f8fSGustavo F. Padovan */ 1381c2287681SIdo Yariv static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, 1382c2287681SIdo Yariv bdaddr_t *src, 1383c2287681SIdo Yariv bdaddr_t *dst) 13840a708f8fSGustavo F. Padovan { 138523691d75SGustavo F. Padovan struct l2cap_chan *c, *c1 = NULL; 13860a708f8fSGustavo F. Padovan 138723691d75SGustavo F. Padovan read_lock(&chan_list_lock); 13880a708f8fSGustavo F. Padovan 138923691d75SGustavo F. Padovan list_for_each_entry(c, &chan_list, global_l) { 139023691d75SGustavo F. Padovan struct sock *sk = c->sk; 1391fe4128e0SGustavo F. Padovan 139289bc500eSGustavo F. Padovan if (state && c->state != state) 13930a708f8fSGustavo F. Padovan continue; 13940a708f8fSGustavo F. Padovan 139523691d75SGustavo F. Padovan if (c->psm == psm) { 1396c2287681SIdo Yariv int src_match, dst_match; 1397c2287681SIdo Yariv int src_any, dst_any; 1398c2287681SIdo Yariv 13990a708f8fSGustavo F. Padovan /* Exact match. */ 1400c2287681SIdo Yariv src_match = !bacmp(&bt_sk(sk)->src, src); 1401c2287681SIdo Yariv dst_match = !bacmp(&bt_sk(sk)->dst, dst); 1402c2287681SIdo Yariv if (src_match && dst_match) { 1403a7567b20SJohannes Berg read_unlock(&chan_list_lock); 140423691d75SGustavo F. Padovan return c; 140523691d75SGustavo F. Padovan } 14060a708f8fSGustavo F. Padovan 14070a708f8fSGustavo F. Padovan /* Closest match */ 1408c2287681SIdo Yariv src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY); 1409c2287681SIdo Yariv dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY); 1410c2287681SIdo Yariv if ((src_match && dst_any) || (src_any && dst_match) || 1411c2287681SIdo Yariv (src_any && dst_any)) 141223691d75SGustavo F. Padovan c1 = c; 14130a708f8fSGustavo F. Padovan } 14140a708f8fSGustavo F. Padovan } 14150a708f8fSGustavo F. Padovan 141623691d75SGustavo F. Padovan read_unlock(&chan_list_lock); 14170a708f8fSGustavo F. Padovan 141823691d75SGustavo F. Padovan return c1; 14190a708f8fSGustavo F. Padovan } 14200a708f8fSGustavo F. Padovan 14218e9f9892SAndre Guedes int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid, 14228e9f9892SAndre Guedes bdaddr_t *dst, u8 dst_type) 14230a708f8fSGustavo F. Padovan { 14245d41ce1dSGustavo F. Padovan struct sock *sk = chan->sk; 14250a708f8fSGustavo F. Padovan bdaddr_t *src = &bt_sk(sk)->src; 14260a708f8fSGustavo F. Padovan struct l2cap_conn *conn; 14270a708f8fSGustavo F. Padovan struct hci_conn *hcon; 14280a708f8fSGustavo F. Padovan struct hci_dev *hdev; 14290a708f8fSGustavo F. Padovan __u8 auth_type; 14300a708f8fSGustavo F. Padovan int err; 14310a708f8fSGustavo F. Padovan 14328e9f9892SAndre Guedes BT_DBG("%s -> %s (type %u) psm 0x%2.2x", batostr(src), batostr(dst), 14338e9f9892SAndre Guedes dst_type, __le16_to_cpu(chan->psm)); 14340a708f8fSGustavo F. Padovan 14350a708f8fSGustavo F. Padovan hdev = hci_get_route(dst, src); 14360a708f8fSGustavo F. Padovan if (!hdev) 14370a708f8fSGustavo F. Padovan return -EHOSTUNREACH; 14380a708f8fSGustavo F. Padovan 143909fd0de5SGustavo F. Padovan hci_dev_lock(hdev); 14400a708f8fSGustavo F. Padovan 14416be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 144203a00194SGustavo F. Padovan 144303a00194SGustavo F. Padovan /* PSM must be odd and lsb of upper byte must be 0 */ 144403a00194SGustavo F. Padovan if ((__le16_to_cpu(psm) & 0x0101) != 0x0001 && !cid && 144503a00194SGustavo F. Padovan chan->chan_type != L2CAP_CHAN_RAW) { 144603a00194SGustavo F. Padovan err = -EINVAL; 144703a00194SGustavo F. Padovan goto done; 144803a00194SGustavo F. Padovan } 144903a00194SGustavo F. Padovan 145003a00194SGustavo F. Padovan if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !(psm || cid)) { 145103a00194SGustavo F. Padovan err = -EINVAL; 145203a00194SGustavo F. Padovan goto done; 145303a00194SGustavo F. Padovan } 145403a00194SGustavo F. Padovan 145503a00194SGustavo F. Padovan switch (chan->mode) { 145603a00194SGustavo F. Padovan case L2CAP_MODE_BASIC: 145703a00194SGustavo F. Padovan break; 145803a00194SGustavo F. Padovan case L2CAP_MODE_ERTM: 145903a00194SGustavo F. Padovan case L2CAP_MODE_STREAMING: 146003a00194SGustavo F. Padovan if (!disable_ertm) 146103a00194SGustavo F. Padovan break; 146203a00194SGustavo F. Padovan /* fall through */ 146303a00194SGustavo F. Padovan default: 146403a00194SGustavo F. Padovan err = -ENOTSUPP; 146503a00194SGustavo F. Padovan goto done; 146603a00194SGustavo F. Padovan } 146703a00194SGustavo F. Padovan 14680797e01dSGustavo Padovan switch (chan->state) { 146903a00194SGustavo F. Padovan case BT_CONNECT: 147003a00194SGustavo F. Padovan case BT_CONNECT2: 147103a00194SGustavo F. Padovan case BT_CONFIG: 147203a00194SGustavo F. Padovan /* Already connecting */ 147303a00194SGustavo F. Padovan err = 0; 147403a00194SGustavo F. Padovan goto done; 147503a00194SGustavo F. Padovan 147603a00194SGustavo F. Padovan case BT_CONNECTED: 147703a00194SGustavo F. Padovan /* Already connected */ 147803a00194SGustavo F. Padovan err = -EISCONN; 147903a00194SGustavo F. Padovan goto done; 148003a00194SGustavo F. Padovan 148103a00194SGustavo F. Padovan case BT_OPEN: 148203a00194SGustavo F. Padovan case BT_BOUND: 148303a00194SGustavo F. Padovan /* Can connect */ 148403a00194SGustavo F. Padovan break; 148503a00194SGustavo F. Padovan 148603a00194SGustavo F. Padovan default: 148703a00194SGustavo F. Padovan err = -EBADFD; 148803a00194SGustavo F. Padovan goto done; 148903a00194SGustavo F. Padovan } 149003a00194SGustavo F. Padovan 149103a00194SGustavo F. Padovan /* Set destination address and psm */ 14920797e01dSGustavo Padovan lock_sock(sk); 14939219b2a0SGustavo F. Padovan bacpy(&bt_sk(sk)->dst, dst); 14946be36555SAndrei Emeltchenko release_sock(sk); 14956be36555SAndrei Emeltchenko 149603a00194SGustavo F. Padovan chan->psm = psm; 149703a00194SGustavo F. Padovan chan->dcid = cid; 14980a708f8fSGustavo F. Padovan 14994343478fSGustavo F. Padovan auth_type = l2cap_get_auth_type(chan); 15000a708f8fSGustavo F. Padovan 1501fe4128e0SGustavo F. Padovan if (chan->dcid == L2CAP_CID_LE_DATA) 15028e9f9892SAndre Guedes hcon = hci_connect(hdev, LE_LINK, dst, dst_type, 15034343478fSGustavo F. Padovan chan->sec_level, auth_type); 1504acd7d370SVille Tervo else 15058e9f9892SAndre Guedes hcon = hci_connect(hdev, ACL_LINK, dst, dst_type, 15064343478fSGustavo F. Padovan chan->sec_level, auth_type); 1507acd7d370SVille Tervo 150830e76272SVille Tervo if (IS_ERR(hcon)) { 150930e76272SVille Tervo err = PTR_ERR(hcon); 15100a708f8fSGustavo F. Padovan goto done; 151130e76272SVille Tervo } 15120a708f8fSGustavo F. Padovan 15130a708f8fSGustavo F. Padovan conn = l2cap_conn_add(hcon, 0); 15140a708f8fSGustavo F. Padovan if (!conn) { 15150a708f8fSGustavo F. Padovan hci_conn_put(hcon); 151630e76272SVille Tervo err = -ENOMEM; 15170a708f8fSGustavo F. Padovan goto done; 15180a708f8fSGustavo F. Padovan } 15190a708f8fSGustavo F. Padovan 15209f0caeb1SVinicius Costa Gomes if (hcon->type == LE_LINK) { 15219f0caeb1SVinicius Costa Gomes err = 0; 15229f0caeb1SVinicius Costa Gomes 15239f0caeb1SVinicius Costa Gomes if (!list_empty(&conn->chan_l)) { 15249f0caeb1SVinicius Costa Gomes err = -EBUSY; 15259f0caeb1SVinicius Costa Gomes hci_conn_put(hcon); 15269f0caeb1SVinicius Costa Gomes } 15279f0caeb1SVinicius Costa Gomes 15289f0caeb1SVinicius Costa Gomes if (err) 15299f0caeb1SVinicius Costa Gomes goto done; 15309f0caeb1SVinicius Costa Gomes } 15319f0caeb1SVinicius Costa Gomes 15320a708f8fSGustavo F. Padovan /* Update source addr of the socket */ 15330a708f8fSGustavo F. Padovan bacpy(src, conn->src); 15340a708f8fSGustavo F. Padovan 15356be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 153648454079SGustavo F. Padovan l2cap_chan_add(conn, chan); 15376be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 153848454079SGustavo F. Padovan 15396be36555SAndrei Emeltchenko l2cap_state_change(chan, BT_CONNECT); 1540c9b66675SGustavo F. Padovan __set_chan_timer(chan, sk->sk_sndtimeo); 15410a708f8fSGustavo F. Padovan 15420a708f8fSGustavo F. Padovan if (hcon->state == BT_CONNECTED) { 1543715ec005SGustavo F. Padovan if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { 1544c9b66675SGustavo F. Padovan __clear_chan_timer(chan); 1545d45fc423SGustavo F. Padovan if (l2cap_chan_check_security(chan)) 15466be36555SAndrei Emeltchenko l2cap_state_change(chan, BT_CONNECTED); 15470a708f8fSGustavo F. Padovan } else 1548fc7f8a7eSGustavo F. Padovan l2cap_do_start(chan); 15490a708f8fSGustavo F. Padovan } 15500a708f8fSGustavo F. Padovan 155130e76272SVille Tervo err = 0; 155230e76272SVille Tervo 15530a708f8fSGustavo F. Padovan done: 15546be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 155509fd0de5SGustavo F. Padovan hci_dev_unlock(hdev); 15560a708f8fSGustavo F. Padovan hci_dev_put(hdev); 15570a708f8fSGustavo F. Padovan return err; 15580a708f8fSGustavo F. Padovan } 15590a708f8fSGustavo F. Padovan 1560dcba0dbaSGustavo F. Padovan int __l2cap_wait_ack(struct sock *sk) 15610a708f8fSGustavo F. Padovan { 15628c1d787bSGustavo F. Padovan struct l2cap_chan *chan = l2cap_pi(sk)->chan; 15630a708f8fSGustavo F. Padovan DECLARE_WAITQUEUE(wait, current); 15640a708f8fSGustavo F. Padovan int err = 0; 15650a708f8fSGustavo F. Padovan int timeo = HZ/5; 15660a708f8fSGustavo F. Padovan 15670a708f8fSGustavo F. Padovan add_wait_queue(sk_sleep(sk), &wait); 15680a708f8fSGustavo F. Padovan set_current_state(TASK_INTERRUPTIBLE); 1569a71a0cf4SPeter Hurley while (chan->unacked_frames > 0 && chan->conn) { 15700a708f8fSGustavo F. Padovan if (!timeo) 15710a708f8fSGustavo F. Padovan timeo = HZ/5; 15720a708f8fSGustavo F. Padovan 15730a708f8fSGustavo F. Padovan if (signal_pending(current)) { 15740a708f8fSGustavo F. Padovan err = sock_intr_errno(timeo); 15750a708f8fSGustavo F. Padovan break; 15760a708f8fSGustavo F. Padovan } 15770a708f8fSGustavo F. Padovan 15780a708f8fSGustavo F. Padovan release_sock(sk); 15790a708f8fSGustavo F. Padovan timeo = schedule_timeout(timeo); 15800a708f8fSGustavo F. Padovan lock_sock(sk); 1581a71a0cf4SPeter Hurley set_current_state(TASK_INTERRUPTIBLE); 15820a708f8fSGustavo F. Padovan 15830a708f8fSGustavo F. Padovan err = sock_error(sk); 15840a708f8fSGustavo F. Padovan if (err) 15850a708f8fSGustavo F. Padovan break; 15860a708f8fSGustavo F. Padovan } 15870a708f8fSGustavo F. Padovan set_current_state(TASK_RUNNING); 15880a708f8fSGustavo F. Padovan remove_wait_queue(sk_sleep(sk), &wait); 15890a708f8fSGustavo F. Padovan return err; 15900a708f8fSGustavo F. Padovan } 15910a708f8fSGustavo F. Padovan 1592721c4181SGustavo F. Padovan static void l2cap_monitor_timeout(struct work_struct *work) 15930a708f8fSGustavo F. Padovan { 1594721c4181SGustavo F. Padovan struct l2cap_chan *chan = container_of(work, struct l2cap_chan, 1595721c4181SGustavo F. Padovan monitor_timer.work); 15960a708f8fSGustavo F. Padovan 1597525cd185SGustavo F. Padovan BT_DBG("chan %p", chan); 15980a708f8fSGustavo F. Padovan 15996be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 16006be36555SAndrei Emeltchenko 160180909e04SMat Martineau if (!chan->conn) { 16026be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 16038d7e1c7fSAndrei Emeltchenko l2cap_chan_put(chan); 16040a708f8fSGustavo F. Padovan return; 16050a708f8fSGustavo F. Padovan } 16060a708f8fSGustavo F. Padovan 1607401bb1f7SAndrei Emeltchenko l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO); 16080a708f8fSGustavo F. Padovan 16096be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 16108d7e1c7fSAndrei Emeltchenko l2cap_chan_put(chan); 16110a708f8fSGustavo F. Padovan } 16120a708f8fSGustavo F. Padovan 1613721c4181SGustavo F. Padovan static void l2cap_retrans_timeout(struct work_struct *work) 16140a708f8fSGustavo F. Padovan { 1615721c4181SGustavo F. Padovan struct l2cap_chan *chan = container_of(work, struct l2cap_chan, 1616721c4181SGustavo F. Padovan retrans_timer.work); 16170a708f8fSGustavo F. Padovan 161849208c9cSGustavo F. Padovan BT_DBG("chan %p", chan); 16190a708f8fSGustavo F. Padovan 16206be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 16216be36555SAndrei Emeltchenko 162280909e04SMat Martineau if (!chan->conn) { 162380909e04SMat Martineau l2cap_chan_unlock(chan); 162480909e04SMat Martineau l2cap_chan_put(chan); 162580909e04SMat Martineau return; 162680909e04SMat Martineau } 16270a708f8fSGustavo F. Padovan 1628401bb1f7SAndrei Emeltchenko l2cap_tx(chan, NULL, NULL, L2CAP_EV_RETRANS_TO); 16296be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 16308d7e1c7fSAndrei Emeltchenko l2cap_chan_put(chan); 16310a708f8fSGustavo F. Padovan } 16320a708f8fSGustavo F. Padovan 1633d660366dSGustavo Padovan static void l2cap_streaming_send(struct l2cap_chan *chan, 16343733937dSMat Martineau struct sk_buff_head *skbs) 16350a708f8fSGustavo F. Padovan { 16360a708f8fSGustavo F. Padovan struct sk_buff *skb; 16373733937dSMat Martineau struct l2cap_ctrl *control; 16380a708f8fSGustavo F. Padovan 16393733937dSMat Martineau BT_DBG("chan %p, skbs %p", chan, skbs); 16403733937dSMat Martineau 16413733937dSMat Martineau skb_queue_splice_tail_init(skbs, &chan->tx_q); 16423733937dSMat Martineau 16433733937dSMat Martineau while (!skb_queue_empty(&chan->tx_q)) { 16443733937dSMat Martineau 16453733937dSMat Martineau skb = skb_dequeue(&chan->tx_q); 16463733937dSMat Martineau 16473733937dSMat Martineau bt_cb(skb)->control.retries = 1; 16483733937dSMat Martineau control = &bt_cb(skb)->control; 16493733937dSMat Martineau 16503733937dSMat Martineau control->reqseq = 0; 16513733937dSMat Martineau control->txseq = chan->next_tx_seq; 16523733937dSMat Martineau 16533733937dSMat Martineau __pack_control(chan, control, skb); 16540a708f8fSGustavo F. Padovan 165547d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) { 16563733937dSMat Martineau u16 fcs = crc16(0, (u8 *) skb->data, skb->len); 16573733937dSMat Martineau put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); 16580a708f8fSGustavo F. Padovan } 16590a708f8fSGustavo F. Padovan 16604343478fSGustavo F. Padovan l2cap_do_send(chan, skb); 16610a708f8fSGustavo F. Padovan 1662b4400672SAndrei Emeltchenko BT_DBG("Sent txseq %u", control->txseq); 16633733937dSMat Martineau 1664836be934SAndrei Emeltchenko chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); 16653733937dSMat Martineau chan->frames_sent++; 16660a708f8fSGustavo F. Padovan } 16670a708f8fSGustavo F. Padovan } 16680a708f8fSGustavo F. Padovan 166967c9e840SSzymon Janc static int l2cap_ertm_send(struct l2cap_chan *chan) 16700a708f8fSGustavo F. Padovan { 16710a708f8fSGustavo F. Padovan struct sk_buff *skb, *tx_skb; 167218a48e76SMat Martineau struct l2cap_ctrl *control; 167318a48e76SMat Martineau int sent = 0; 167418a48e76SMat Martineau 167518a48e76SMat Martineau BT_DBG("chan %p", chan); 16760a708f8fSGustavo F. Padovan 167789bc500eSGustavo F. Padovan if (chan->state != BT_CONNECTED) 16780a708f8fSGustavo F. Padovan return -ENOTCONN; 16790a708f8fSGustavo F. Padovan 168094122bbeSMat Martineau if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) 168194122bbeSMat Martineau return 0; 168294122bbeSMat Martineau 168318a48e76SMat Martineau while (chan->tx_send_head && 168418a48e76SMat Martineau chan->unacked_frames < chan->remote_tx_win && 168518a48e76SMat Martineau chan->tx_state == L2CAP_TX_STATE_XMIT) { 16860a708f8fSGustavo F. Padovan 168718a48e76SMat Martineau skb = chan->tx_send_head; 16880a708f8fSGustavo F. Padovan 168918a48e76SMat Martineau bt_cb(skb)->control.retries = 1; 169018a48e76SMat Martineau control = &bt_cb(skb)->control; 16910a708f8fSGustavo F. Padovan 1692e2ab4353SGustavo F. Padovan if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) 169318a48e76SMat Martineau control->final = 1; 1694e2ab4353SGustavo F. Padovan 169518a48e76SMat Martineau control->reqseq = chan->buffer_seq; 169618a48e76SMat Martineau chan->last_acked_seq = chan->buffer_seq; 169718a48e76SMat Martineau control->txseq = chan->next_tx_seq; 16980a708f8fSGustavo F. Padovan 169918a48e76SMat Martineau __pack_control(chan, control, skb); 17000a708f8fSGustavo F. Padovan 170147d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) { 170218a48e76SMat Martineau u16 fcs = crc16(0, (u8 *) skb->data, skb->len); 170318a48e76SMat Martineau put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); 17040a708f8fSGustavo F. Padovan } 17050a708f8fSGustavo F. Padovan 170618a48e76SMat Martineau /* Clone after data has been modified. Data is assumed to be 170718a48e76SMat Martineau read-only (for locking purposes) on cloned sk_buffs. 170818a48e76SMat Martineau */ 170918a48e76SMat Martineau tx_skb = skb_clone(skb, GFP_KERNEL); 171018a48e76SMat Martineau 171118a48e76SMat Martineau if (!tx_skb) 171218a48e76SMat Martineau break; 17130a708f8fSGustavo F. Padovan 17141a09bcb9SGustavo F. Padovan __set_retrans_timer(chan); 17150a708f8fSGustavo F. Padovan 1716836be934SAndrei Emeltchenko chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); 17176a026610SGustavo F. Padovan chan->unacked_frames++; 17186a026610SGustavo F. Padovan chan->frames_sent++; 171918a48e76SMat Martineau sent++; 17200a708f8fSGustavo F. Padovan 172158d35f87SGustavo F. Padovan if (skb_queue_is_last(&chan->tx_q, skb)) 172258d35f87SGustavo F. Padovan chan->tx_send_head = NULL; 17230a708f8fSGustavo F. Padovan else 172458d35f87SGustavo F. Padovan chan->tx_send_head = skb_queue_next(&chan->tx_q, skb); 172518a48e76SMat Martineau 172618a48e76SMat Martineau l2cap_do_send(chan, tx_skb); 1727b4400672SAndrei Emeltchenko BT_DBG("Sent txseq %u", control->txseq); 17280a708f8fSGustavo F. Padovan } 17290a708f8fSGustavo F. Padovan 1730b4400672SAndrei Emeltchenko BT_DBG("Sent %d, %u unacked, %u in ERTM queue", sent, 1731b4400672SAndrei Emeltchenko chan->unacked_frames, skb_queue_len(&chan->tx_q)); 173218a48e76SMat Martineau 173318a48e76SMat Martineau return sent; 17340a708f8fSGustavo F. Padovan } 17350a708f8fSGustavo F. Padovan 1736e1fbd4c1SMat Martineau static void l2cap_ertm_resend(struct l2cap_chan *chan) 1737e1fbd4c1SMat Martineau { 1738e1fbd4c1SMat Martineau struct l2cap_ctrl control; 1739e1fbd4c1SMat Martineau struct sk_buff *skb; 1740e1fbd4c1SMat Martineau struct sk_buff *tx_skb; 1741e1fbd4c1SMat Martineau u16 seq; 1742e1fbd4c1SMat Martineau 1743e1fbd4c1SMat Martineau BT_DBG("chan %p", chan); 1744e1fbd4c1SMat Martineau 1745e1fbd4c1SMat Martineau if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) 1746e1fbd4c1SMat Martineau return; 1747e1fbd4c1SMat Martineau 1748e1fbd4c1SMat Martineau while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) { 1749e1fbd4c1SMat Martineau seq = l2cap_seq_list_pop(&chan->retrans_list); 1750e1fbd4c1SMat Martineau 1751e1fbd4c1SMat Martineau skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq); 1752e1fbd4c1SMat Martineau if (!skb) { 1753e1fbd4c1SMat Martineau BT_DBG("Error: Can't retransmit seq %d, frame missing", 1754e1fbd4c1SMat Martineau seq); 1755e1fbd4c1SMat Martineau continue; 1756e1fbd4c1SMat Martineau } 1757e1fbd4c1SMat Martineau 1758e1fbd4c1SMat Martineau bt_cb(skb)->control.retries++; 1759e1fbd4c1SMat Martineau control = bt_cb(skb)->control; 1760e1fbd4c1SMat Martineau 1761e1fbd4c1SMat Martineau if (chan->max_tx != 0 && 1762e1fbd4c1SMat Martineau bt_cb(skb)->control.retries > chan->max_tx) { 1763e1fbd4c1SMat Martineau BT_DBG("Retry limit exceeded (%d)", chan->max_tx); 1764e1fbd4c1SMat Martineau l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); 1765e1fbd4c1SMat Martineau l2cap_seq_list_clear(&chan->retrans_list); 1766e1fbd4c1SMat Martineau break; 1767e1fbd4c1SMat Martineau } 1768e1fbd4c1SMat Martineau 1769e1fbd4c1SMat Martineau control.reqseq = chan->buffer_seq; 1770e1fbd4c1SMat Martineau if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) 1771e1fbd4c1SMat Martineau control.final = 1; 1772e1fbd4c1SMat Martineau else 1773e1fbd4c1SMat Martineau control.final = 0; 1774e1fbd4c1SMat Martineau 1775e1fbd4c1SMat Martineau if (skb_cloned(skb)) { 1776e1fbd4c1SMat Martineau /* Cloned sk_buffs are read-only, so we need a 1777e1fbd4c1SMat Martineau * writeable copy 1778e1fbd4c1SMat Martineau */ 1779e1fbd4c1SMat Martineau tx_skb = skb_copy(skb, GFP_ATOMIC); 1780e1fbd4c1SMat Martineau } else { 1781e1fbd4c1SMat Martineau tx_skb = skb_clone(skb, GFP_ATOMIC); 1782e1fbd4c1SMat Martineau } 1783e1fbd4c1SMat Martineau 1784e1fbd4c1SMat Martineau if (!tx_skb) { 1785e1fbd4c1SMat Martineau l2cap_seq_list_clear(&chan->retrans_list); 1786e1fbd4c1SMat Martineau break; 1787e1fbd4c1SMat Martineau } 1788e1fbd4c1SMat Martineau 1789e1fbd4c1SMat Martineau /* Update skb contents */ 1790e1fbd4c1SMat Martineau if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { 1791e1fbd4c1SMat Martineau put_unaligned_le32(__pack_extended_control(&control), 1792e1fbd4c1SMat Martineau tx_skb->data + L2CAP_HDR_SIZE); 1793e1fbd4c1SMat Martineau } else { 1794e1fbd4c1SMat Martineau put_unaligned_le16(__pack_enhanced_control(&control), 1795e1fbd4c1SMat Martineau tx_skb->data + L2CAP_HDR_SIZE); 1796e1fbd4c1SMat Martineau } 1797e1fbd4c1SMat Martineau 1798e1fbd4c1SMat Martineau if (chan->fcs == L2CAP_FCS_CRC16) { 1799e1fbd4c1SMat Martineau u16 fcs = crc16(0, (u8 *) tx_skb->data, tx_skb->len); 1800e1fbd4c1SMat Martineau put_unaligned_le16(fcs, skb_put(tx_skb, 1801e1fbd4c1SMat Martineau L2CAP_FCS_SIZE)); 1802e1fbd4c1SMat Martineau } 1803e1fbd4c1SMat Martineau 1804e1fbd4c1SMat Martineau l2cap_do_send(chan, tx_skb); 1805e1fbd4c1SMat Martineau 1806e1fbd4c1SMat Martineau BT_DBG("Resent txseq %d", control.txseq); 1807e1fbd4c1SMat Martineau 1808e1fbd4c1SMat Martineau chan->last_acked_seq = chan->buffer_seq; 1809e1fbd4c1SMat Martineau } 1810e1fbd4c1SMat Martineau } 1811e1fbd4c1SMat Martineau 1812f80842a8SMat Martineau static void l2cap_retransmit(struct l2cap_chan *chan, 1813f80842a8SMat Martineau struct l2cap_ctrl *control) 1814f80842a8SMat Martineau { 1815f80842a8SMat Martineau BT_DBG("chan %p, control %p", chan, control); 1816f80842a8SMat Martineau 1817f80842a8SMat Martineau l2cap_seq_list_append(&chan->retrans_list, control->reqseq); 1818f80842a8SMat Martineau l2cap_ertm_resend(chan); 1819f80842a8SMat Martineau } 1820f80842a8SMat Martineau 1821d2a7ac5dSMat Martineau static void l2cap_retransmit_all(struct l2cap_chan *chan, 1822d2a7ac5dSMat Martineau struct l2cap_ctrl *control) 1823d2a7ac5dSMat Martineau { 1824e1fbd4c1SMat Martineau struct sk_buff *skb; 1825e1fbd4c1SMat Martineau 1826e1fbd4c1SMat Martineau BT_DBG("chan %p, control %p", chan, control); 1827e1fbd4c1SMat Martineau 1828e1fbd4c1SMat Martineau if (control->poll) 1829e1fbd4c1SMat Martineau set_bit(CONN_SEND_FBIT, &chan->conn_state); 1830e1fbd4c1SMat Martineau 1831e1fbd4c1SMat Martineau l2cap_seq_list_clear(&chan->retrans_list); 1832e1fbd4c1SMat Martineau 1833e1fbd4c1SMat Martineau if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) 1834e1fbd4c1SMat Martineau return; 1835e1fbd4c1SMat Martineau 1836e1fbd4c1SMat Martineau if (chan->unacked_frames) { 1837e1fbd4c1SMat Martineau skb_queue_walk(&chan->tx_q, skb) { 1838e1fbd4c1SMat Martineau if (bt_cb(skb)->control.txseq == control->reqseq || 1839e1fbd4c1SMat Martineau skb == chan->tx_send_head) 1840e1fbd4c1SMat Martineau break; 1841e1fbd4c1SMat Martineau } 1842e1fbd4c1SMat Martineau 1843e1fbd4c1SMat Martineau skb_queue_walk_from(&chan->tx_q, skb) { 1844e1fbd4c1SMat Martineau if (skb == chan->tx_send_head) 1845e1fbd4c1SMat Martineau break; 1846e1fbd4c1SMat Martineau 1847e1fbd4c1SMat Martineau l2cap_seq_list_append(&chan->retrans_list, 1848e1fbd4c1SMat Martineau bt_cb(skb)->control.txseq); 1849e1fbd4c1SMat Martineau } 1850e1fbd4c1SMat Martineau 1851e1fbd4c1SMat Martineau l2cap_ertm_resend(chan); 1852e1fbd4c1SMat Martineau } 1853d2a7ac5dSMat Martineau } 1854d2a7ac5dSMat Martineau 1855b17e73bbSSzymon Janc static void l2cap_send_ack(struct l2cap_chan *chan) 1856b17e73bbSSzymon Janc { 18570a0aba42SMat Martineau struct l2cap_ctrl control; 18580a0aba42SMat Martineau u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq, 18590a0aba42SMat Martineau chan->last_acked_seq); 18600a0aba42SMat Martineau int threshold; 18610a0aba42SMat Martineau 18620a0aba42SMat Martineau BT_DBG("chan %p last_acked_seq %d buffer_seq %d", 18630a0aba42SMat Martineau chan, chan->last_acked_seq, chan->buffer_seq); 18640a0aba42SMat Martineau 18650a0aba42SMat Martineau memset(&control, 0, sizeof(control)); 18660a0aba42SMat Martineau control.sframe = 1; 18670a0aba42SMat Martineau 18680a0aba42SMat Martineau if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && 18690a0aba42SMat Martineau chan->rx_state == L2CAP_RX_STATE_RECV) { 1870b17e73bbSSzymon Janc __clear_ack_timer(chan); 18710a0aba42SMat Martineau control.super = L2CAP_SUPER_RNR; 18720a0aba42SMat Martineau control.reqseq = chan->buffer_seq; 18730a0aba42SMat Martineau l2cap_send_sframe(chan, &control); 18740a0aba42SMat Martineau } else { 18750a0aba42SMat Martineau if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) { 18760a0aba42SMat Martineau l2cap_ertm_send(chan); 18770a0aba42SMat Martineau /* If any i-frames were sent, they included an ack */ 18780a0aba42SMat Martineau if (chan->buffer_seq == chan->last_acked_seq) 18790a0aba42SMat Martineau frames_to_ack = 0; 18800a0aba42SMat Martineau } 18810a0aba42SMat Martineau 1882c20f8e35SMat Martineau /* Ack now if the window is 3/4ths full. 18830a0aba42SMat Martineau * Calculate without mul or div 18840a0aba42SMat Martineau */ 1885c20f8e35SMat Martineau threshold = chan->ack_win; 18860a0aba42SMat Martineau threshold += threshold << 1; 18870a0aba42SMat Martineau threshold >>= 2; 18880a0aba42SMat Martineau 1889b4400672SAndrei Emeltchenko BT_DBG("frames_to_ack %u, threshold %d", frames_to_ack, 18900a0aba42SMat Martineau threshold); 18910a0aba42SMat Martineau 18920a0aba42SMat Martineau if (frames_to_ack >= threshold) { 18930a0aba42SMat Martineau __clear_ack_timer(chan); 18940a0aba42SMat Martineau control.super = L2CAP_SUPER_RR; 18950a0aba42SMat Martineau control.reqseq = chan->buffer_seq; 18960a0aba42SMat Martineau l2cap_send_sframe(chan, &control); 18970a0aba42SMat Martineau frames_to_ack = 0; 18980a0aba42SMat Martineau } 18990a0aba42SMat Martineau 19000a0aba42SMat Martineau if (frames_to_ack) 19010a0aba42SMat Martineau __set_ack_timer(chan); 19020a0aba42SMat Martineau } 1903b17e73bbSSzymon Janc } 1904b17e73bbSSzymon Janc 190504124681SGustavo F. Padovan static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan, 190604124681SGustavo F. Padovan struct msghdr *msg, int len, 190704124681SGustavo F. Padovan int count, struct sk_buff *skb) 19080a708f8fSGustavo F. Padovan { 19090952a57aSAndrei Emeltchenko struct l2cap_conn *conn = chan->conn; 19100a708f8fSGustavo F. Padovan struct sk_buff **frag; 191190338947SGustavo Padovan int sent = 0; 19120a708f8fSGustavo F. Padovan 19130a708f8fSGustavo F. Padovan if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) 19140a708f8fSGustavo F. Padovan return -EFAULT; 19150a708f8fSGustavo F. Padovan 19160a708f8fSGustavo F. Padovan sent += count; 19170a708f8fSGustavo F. Padovan len -= count; 19180a708f8fSGustavo F. Padovan 19190a708f8fSGustavo F. Padovan /* Continuation fragments (no L2CAP header) */ 19200a708f8fSGustavo F. Padovan frag = &skb_shinfo(skb)->frag_list; 19210a708f8fSGustavo F. Padovan while (len) { 1922fbe00700SGustavo Padovan struct sk_buff *tmp; 1923fbe00700SGustavo Padovan 19240a708f8fSGustavo F. Padovan count = min_t(unsigned int, conn->mtu, len); 19250a708f8fSGustavo F. Padovan 1926fbe00700SGustavo Padovan tmp = chan->ops->alloc_skb(chan, count, 192790338947SGustavo Padovan msg->msg_flags & MSG_DONTWAIT); 1928fbe00700SGustavo Padovan if (IS_ERR(tmp)) 1929fbe00700SGustavo Padovan return PTR_ERR(tmp); 19302f7719ceSAndrei Emeltchenko 1931fbe00700SGustavo Padovan *frag = tmp; 1932fbe00700SGustavo Padovan 19330a708f8fSGustavo F. Padovan if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) 19340a708f8fSGustavo F. Padovan return -EFAULT; 19350a708f8fSGustavo F. Padovan 19365e59b791SLuiz Augusto von Dentz (*frag)->priority = skb->priority; 19375e59b791SLuiz Augusto von Dentz 19380a708f8fSGustavo F. Padovan sent += count; 19390a708f8fSGustavo F. Padovan len -= count; 19400a708f8fSGustavo F. Padovan 19412d0ed3d5SGustavo Padovan skb->len += (*frag)->len; 19422d0ed3d5SGustavo Padovan skb->data_len += (*frag)->len; 19432d0ed3d5SGustavo Padovan 19440a708f8fSGustavo F. Padovan frag = &(*frag)->next; 19450a708f8fSGustavo F. Padovan } 19460a708f8fSGustavo F. Padovan 19470a708f8fSGustavo F. Padovan return sent; 19480a708f8fSGustavo F. Padovan } 19490a708f8fSGustavo F. Padovan 19505e59b791SLuiz Augusto von Dentz static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, 19515e59b791SLuiz Augusto von Dentz struct msghdr *msg, size_t len, 19525e59b791SLuiz Augusto von Dentz u32 priority) 19530a708f8fSGustavo F. Padovan { 19548c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 19550a708f8fSGustavo F. Padovan struct sk_buff *skb; 195603a51213SAndrei Emeltchenko int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE; 19570a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 19580a708f8fSGustavo F. Padovan 1959b4400672SAndrei Emeltchenko BT_DBG("chan %p len %zu priority %u", chan, len, priority); 19600a708f8fSGustavo F. Padovan 19610a708f8fSGustavo F. Padovan count = min_t(unsigned int, (conn->mtu - hlen), len); 19622f7719ceSAndrei Emeltchenko 19632f7719ceSAndrei Emeltchenko skb = chan->ops->alloc_skb(chan, count + hlen, 196490338947SGustavo Padovan msg->msg_flags & MSG_DONTWAIT); 196590338947SGustavo Padovan if (IS_ERR(skb)) 196690338947SGustavo Padovan return skb; 19670a708f8fSGustavo F. Padovan 19685e59b791SLuiz Augusto von Dentz skb->priority = priority; 19695e59b791SLuiz Augusto von Dentz 19700a708f8fSGustavo F. Padovan /* Create L2CAP header */ 19710a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 1972fe4128e0SGustavo F. Padovan lh->cid = cpu_to_le16(chan->dcid); 1973daf6a78cSAndrei Emeltchenko lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE); 1974daf6a78cSAndrei Emeltchenko put_unaligned(chan->psm, skb_put(skb, L2CAP_PSMLEN_SIZE)); 19750a708f8fSGustavo F. Padovan 19760952a57aSAndrei Emeltchenko err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); 19770a708f8fSGustavo F. Padovan if (unlikely(err < 0)) { 19780a708f8fSGustavo F. Padovan kfree_skb(skb); 19790a708f8fSGustavo F. Padovan return ERR_PTR(err); 19800a708f8fSGustavo F. Padovan } 19810a708f8fSGustavo F. Padovan return skb; 19820a708f8fSGustavo F. Padovan } 19830a708f8fSGustavo F. Padovan 19845e59b791SLuiz Augusto von Dentz static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, 19855e59b791SLuiz Augusto von Dentz struct msghdr *msg, size_t len, 19865e59b791SLuiz Augusto von Dentz u32 priority) 19870a708f8fSGustavo F. Padovan { 19888c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 19890a708f8fSGustavo F. Padovan struct sk_buff *skb; 1990f2ba7faeSGustavo Padovan int err, count; 19910a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 19920a708f8fSGustavo F. Padovan 1993b4400672SAndrei Emeltchenko BT_DBG("chan %p len %zu", chan, len); 19940a708f8fSGustavo F. Padovan 1995f2ba7faeSGustavo Padovan count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len); 19962f7719ceSAndrei Emeltchenko 1997f2ba7faeSGustavo Padovan skb = chan->ops->alloc_skb(chan, count + L2CAP_HDR_SIZE, 199890338947SGustavo Padovan msg->msg_flags & MSG_DONTWAIT); 199990338947SGustavo Padovan if (IS_ERR(skb)) 200090338947SGustavo Padovan return skb; 20010a708f8fSGustavo F. Padovan 20025e59b791SLuiz Augusto von Dentz skb->priority = priority; 20035e59b791SLuiz Augusto von Dentz 20040a708f8fSGustavo F. Padovan /* Create L2CAP header */ 20050a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 2006fe4128e0SGustavo F. Padovan lh->cid = cpu_to_le16(chan->dcid); 20076ff9b5efSGustavo Padovan lh->len = cpu_to_le16(len); 20080a708f8fSGustavo F. Padovan 20090952a57aSAndrei Emeltchenko err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); 20100a708f8fSGustavo F. Padovan if (unlikely(err < 0)) { 20110a708f8fSGustavo F. Padovan kfree_skb(skb); 20120a708f8fSGustavo F. Padovan return ERR_PTR(err); 20130a708f8fSGustavo F. Padovan } 20140a708f8fSGustavo F. Padovan return skb; 20150a708f8fSGustavo F. Padovan } 20160a708f8fSGustavo F. Padovan 2017ab0ff76dSLuiz Augusto von Dentz static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, 2018ab0ff76dSLuiz Augusto von Dentz struct msghdr *msg, size_t len, 201994122bbeSMat Martineau u16 sdulen) 20200a708f8fSGustavo F. Padovan { 20218c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 20220a708f8fSGustavo F. Padovan struct sk_buff *skb; 2023e4ca6d98SAndrei Emeltchenko int err, count, hlen; 20240a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 20250a708f8fSGustavo F. Padovan 2026b4400672SAndrei Emeltchenko BT_DBG("chan %p len %zu", chan, len); 20270a708f8fSGustavo F. Padovan 20280a708f8fSGustavo F. Padovan if (!conn) 20290a708f8fSGustavo F. Padovan return ERR_PTR(-ENOTCONN); 20300a708f8fSGustavo F. Padovan 2031ba7aa64fSGustavo Padovan hlen = __ertm_hdr_size(chan); 2032e4ca6d98SAndrei Emeltchenko 20330a708f8fSGustavo F. Padovan if (sdulen) 203403a51213SAndrei Emeltchenko hlen += L2CAP_SDULEN_SIZE; 20350a708f8fSGustavo F. Padovan 203647d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) 203703a51213SAndrei Emeltchenko hlen += L2CAP_FCS_SIZE; 20380a708f8fSGustavo F. Padovan 20390a708f8fSGustavo F. Padovan count = min_t(unsigned int, (conn->mtu - hlen), len); 20402f7719ceSAndrei Emeltchenko 20412f7719ceSAndrei Emeltchenko skb = chan->ops->alloc_skb(chan, count + hlen, 204290338947SGustavo Padovan msg->msg_flags & MSG_DONTWAIT); 204390338947SGustavo Padovan if (IS_ERR(skb)) 204490338947SGustavo Padovan return skb; 20450a708f8fSGustavo F. Padovan 20460a708f8fSGustavo F. Padovan /* Create L2CAP header */ 20470a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 2048fe4128e0SGustavo F. Padovan lh->cid = cpu_to_le16(chan->dcid); 20490a708f8fSGustavo F. Padovan lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); 205088843ab0SAndrei Emeltchenko 205118a48e76SMat Martineau /* Control header is populated later */ 205218a48e76SMat Martineau if (test_bit(FLAG_EXT_CTRL, &chan->flags)) 205318a48e76SMat Martineau put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); 205418a48e76SMat Martineau else 205518a48e76SMat Martineau put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); 205688843ab0SAndrei Emeltchenko 20570a708f8fSGustavo F. Padovan if (sdulen) 205803a51213SAndrei Emeltchenko put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE)); 20590a708f8fSGustavo F. Padovan 20600952a57aSAndrei Emeltchenko err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); 20610a708f8fSGustavo F. Padovan if (unlikely(err < 0)) { 20620a708f8fSGustavo F. Padovan kfree_skb(skb); 20630a708f8fSGustavo F. Padovan return ERR_PTR(err); 20640a708f8fSGustavo F. Padovan } 20650a708f8fSGustavo F. Padovan 206618a48e76SMat Martineau bt_cb(skb)->control.fcs = chan->fcs; 20673ce3514fSMat Martineau bt_cb(skb)->control.retries = 0; 20680a708f8fSGustavo F. Padovan return skb; 20690a708f8fSGustavo F. Padovan } 20700a708f8fSGustavo F. Padovan 207194122bbeSMat Martineau static int l2cap_segment_sdu(struct l2cap_chan *chan, 207294122bbeSMat Martineau struct sk_buff_head *seg_queue, 207394122bbeSMat Martineau struct msghdr *msg, size_t len) 20740a708f8fSGustavo F. Padovan { 20750a708f8fSGustavo F. Padovan struct sk_buff *skb; 207694122bbeSMat Martineau u16 sdu_len; 207794122bbeSMat Martineau size_t pdu_len; 207894122bbeSMat Martineau u8 sar; 20790a708f8fSGustavo F. Padovan 2080b4400672SAndrei Emeltchenko BT_DBG("chan %p, msg %p, len %zu", chan, msg, len); 20810a708f8fSGustavo F. Padovan 208294122bbeSMat Martineau /* It is critical that ERTM PDUs fit in a single HCI fragment, 208394122bbeSMat Martineau * so fragmented skbs are not used. The HCI layer's handling 208494122bbeSMat Martineau * of fragmented skbs is not compatible with ERTM's queueing. 208594122bbeSMat Martineau */ 208694122bbeSMat Martineau 208794122bbeSMat Martineau /* PDU size is derived from the HCI MTU */ 208894122bbeSMat Martineau pdu_len = chan->conn->mtu; 208994122bbeSMat Martineau 209094122bbeSMat Martineau pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD); 209194122bbeSMat Martineau 209294122bbeSMat Martineau /* Adjust for largest possible L2CAP overhead. */ 209335d401dfSGustavo Padovan if (chan->fcs) 209435d401dfSGustavo Padovan pdu_len -= L2CAP_FCS_SIZE; 209535d401dfSGustavo Padovan 2096ba7aa64fSGustavo Padovan pdu_len -= __ertm_hdr_size(chan); 209794122bbeSMat Martineau 209894122bbeSMat Martineau /* Remote device may have requested smaller PDUs */ 209994122bbeSMat Martineau pdu_len = min_t(size_t, pdu_len, chan->remote_mps); 210094122bbeSMat Martineau 210194122bbeSMat Martineau if (len <= pdu_len) { 210294122bbeSMat Martineau sar = L2CAP_SAR_UNSEGMENTED; 210394122bbeSMat Martineau sdu_len = 0; 210494122bbeSMat Martineau pdu_len = len; 210594122bbeSMat Martineau } else { 210694122bbeSMat Martineau sar = L2CAP_SAR_START; 210794122bbeSMat Martineau sdu_len = len; 210894122bbeSMat Martineau pdu_len -= L2CAP_SDULEN_SIZE; 210994122bbeSMat Martineau } 21100a708f8fSGustavo F. Padovan 21110a708f8fSGustavo F. Padovan while (len > 0) { 211294122bbeSMat Martineau skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len); 21130a708f8fSGustavo F. Padovan 21140a708f8fSGustavo F. Padovan if (IS_ERR(skb)) { 211594122bbeSMat Martineau __skb_queue_purge(seg_queue); 21160a708f8fSGustavo F. Padovan return PTR_ERR(skb); 21170a708f8fSGustavo F. Padovan } 21180a708f8fSGustavo F. Padovan 211994122bbeSMat Martineau bt_cb(skb)->control.sar = sar; 212094122bbeSMat Martineau __skb_queue_tail(seg_queue, skb); 21210a708f8fSGustavo F. Padovan 212294122bbeSMat Martineau len -= pdu_len; 212394122bbeSMat Martineau if (sdu_len) { 212494122bbeSMat Martineau sdu_len = 0; 212594122bbeSMat Martineau pdu_len += L2CAP_SDULEN_SIZE; 212694122bbeSMat Martineau } 212794122bbeSMat Martineau 212894122bbeSMat Martineau if (len <= pdu_len) { 212994122bbeSMat Martineau sar = L2CAP_SAR_END; 213094122bbeSMat Martineau pdu_len = len; 213194122bbeSMat Martineau } else { 213294122bbeSMat Martineau sar = L2CAP_SAR_CONTINUE; 213394122bbeSMat Martineau } 213494122bbeSMat Martineau } 213594122bbeSMat Martineau 2136f0f62799SGustavo Padovan return 0; 21370a708f8fSGustavo F. Padovan } 21380a708f8fSGustavo F. Padovan 21395e59b791SLuiz Augusto von Dentz int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len, 21405e59b791SLuiz Augusto von Dentz u32 priority) 21419a91a04aSGustavo F. Padovan { 21429a91a04aSGustavo F. Padovan struct sk_buff *skb; 21439a91a04aSGustavo F. Padovan int err; 214494122bbeSMat Martineau struct sk_buff_head seg_queue; 21459a91a04aSGustavo F. Padovan 21469a91a04aSGustavo F. Padovan /* Connectionless channel */ 2147715ec005SGustavo F. Padovan if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { 21485e59b791SLuiz Augusto von Dentz skb = l2cap_create_connless_pdu(chan, msg, len, priority); 21499a91a04aSGustavo F. Padovan if (IS_ERR(skb)) 21509a91a04aSGustavo F. Padovan return PTR_ERR(skb); 21519a91a04aSGustavo F. Padovan 21529a91a04aSGustavo F. Padovan l2cap_do_send(chan, skb); 21539a91a04aSGustavo F. Padovan return len; 21549a91a04aSGustavo F. Padovan } 21559a91a04aSGustavo F. Padovan 21569a91a04aSGustavo F. Padovan switch (chan->mode) { 21579a91a04aSGustavo F. Padovan case L2CAP_MODE_BASIC: 21589a91a04aSGustavo F. Padovan /* Check outgoing MTU */ 21599a91a04aSGustavo F. Padovan if (len > chan->omtu) 21609a91a04aSGustavo F. Padovan return -EMSGSIZE; 21619a91a04aSGustavo F. Padovan 21629a91a04aSGustavo F. Padovan /* Create a basic PDU */ 21635e59b791SLuiz Augusto von Dentz skb = l2cap_create_basic_pdu(chan, msg, len, priority); 21649a91a04aSGustavo F. Padovan if (IS_ERR(skb)) 21659a91a04aSGustavo F. Padovan return PTR_ERR(skb); 21669a91a04aSGustavo F. Padovan 21679a91a04aSGustavo F. Padovan l2cap_do_send(chan, skb); 21689a91a04aSGustavo F. Padovan err = len; 21699a91a04aSGustavo F. Padovan break; 21709a91a04aSGustavo F. Padovan 21719a91a04aSGustavo F. Padovan case L2CAP_MODE_ERTM: 21729a91a04aSGustavo F. Padovan case L2CAP_MODE_STREAMING: 217394122bbeSMat Martineau /* Check outgoing MTU */ 217494122bbeSMat Martineau if (len > chan->omtu) { 217594122bbeSMat Martineau err = -EMSGSIZE; 21769a91a04aSGustavo F. Padovan break; 21779a91a04aSGustavo F. Padovan } 21789a91a04aSGustavo F. Padovan 217994122bbeSMat Martineau __skb_queue_head_init(&seg_queue); 218094122bbeSMat Martineau 218194122bbeSMat Martineau /* Do segmentation before calling in to the state machine, 218294122bbeSMat Martineau * since it's possible to block while waiting for memory 218394122bbeSMat Martineau * allocation. 218494122bbeSMat Martineau */ 218594122bbeSMat Martineau err = l2cap_segment_sdu(chan, &seg_queue, msg, len); 218694122bbeSMat Martineau 218794122bbeSMat Martineau /* The channel could have been closed while segmenting, 218894122bbeSMat Martineau * check that it is still connected. 218994122bbeSMat Martineau */ 219094122bbeSMat Martineau if (chan->state != BT_CONNECTED) { 219194122bbeSMat Martineau __skb_queue_purge(&seg_queue); 219294122bbeSMat Martineau err = -ENOTCONN; 21939a91a04aSGustavo F. Padovan } 21949a91a04aSGustavo F. Padovan 219594122bbeSMat Martineau if (err) 219694122bbeSMat Martineau break; 219794122bbeSMat Martineau 21983733937dSMat Martineau if (chan->mode == L2CAP_MODE_ERTM) 2199d660366dSGustavo Padovan l2cap_tx(chan, NULL, &seg_queue, L2CAP_EV_DATA_REQUEST); 22003733937dSMat Martineau else 2201d660366dSGustavo Padovan l2cap_streaming_send(chan, &seg_queue); 220294122bbeSMat Martineau 22039a91a04aSGustavo F. Padovan err = len; 22049a91a04aSGustavo F. Padovan 220594122bbeSMat Martineau /* If the skbs were not queued for sending, they'll still be in 220694122bbeSMat Martineau * seg_queue and need to be purged. 220794122bbeSMat Martineau */ 220894122bbeSMat Martineau __skb_queue_purge(&seg_queue); 22099a91a04aSGustavo F. Padovan break; 22109a91a04aSGustavo F. Padovan 22119a91a04aSGustavo F. Padovan default: 22129a91a04aSGustavo F. Padovan BT_DBG("bad state %1.1x", chan->mode); 22139a91a04aSGustavo F. Padovan err = -EBADFD; 22149a91a04aSGustavo F. Padovan } 22159a91a04aSGustavo F. Padovan 22169a91a04aSGustavo F. Padovan return err; 22179a91a04aSGustavo F. Padovan } 22189a91a04aSGustavo F. Padovan 2219d2a7ac5dSMat Martineau static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq) 2220d2a7ac5dSMat Martineau { 2221bed68bdeSMat Martineau struct l2cap_ctrl control; 2222bed68bdeSMat Martineau u16 seq; 2223bed68bdeSMat Martineau 2224b4400672SAndrei Emeltchenko BT_DBG("chan %p, txseq %u", chan, txseq); 2225bed68bdeSMat Martineau 2226bed68bdeSMat Martineau memset(&control, 0, sizeof(control)); 2227bed68bdeSMat Martineau control.sframe = 1; 2228bed68bdeSMat Martineau control.super = L2CAP_SUPER_SREJ; 2229bed68bdeSMat Martineau 2230bed68bdeSMat Martineau for (seq = chan->expected_tx_seq; seq != txseq; 2231bed68bdeSMat Martineau seq = __next_seq(chan, seq)) { 2232bed68bdeSMat Martineau if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) { 2233bed68bdeSMat Martineau control.reqseq = seq; 2234bed68bdeSMat Martineau l2cap_send_sframe(chan, &control); 2235bed68bdeSMat Martineau l2cap_seq_list_append(&chan->srej_list, seq); 2236bed68bdeSMat Martineau } 2237bed68bdeSMat Martineau } 2238bed68bdeSMat Martineau 2239bed68bdeSMat Martineau chan->expected_tx_seq = __next_seq(chan, txseq); 2240d2a7ac5dSMat Martineau } 2241d2a7ac5dSMat Martineau 2242d2a7ac5dSMat Martineau static void l2cap_send_srej_tail(struct l2cap_chan *chan) 2243d2a7ac5dSMat Martineau { 2244bed68bdeSMat Martineau struct l2cap_ctrl control; 2245bed68bdeSMat Martineau 2246bed68bdeSMat Martineau BT_DBG("chan %p", chan); 2247bed68bdeSMat Martineau 2248bed68bdeSMat Martineau if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR) 2249bed68bdeSMat Martineau return; 2250bed68bdeSMat Martineau 2251bed68bdeSMat Martineau memset(&control, 0, sizeof(control)); 2252bed68bdeSMat Martineau control.sframe = 1; 2253bed68bdeSMat Martineau control.super = L2CAP_SUPER_SREJ; 2254bed68bdeSMat Martineau control.reqseq = chan->srej_list.tail; 2255bed68bdeSMat Martineau l2cap_send_sframe(chan, &control); 2256d2a7ac5dSMat Martineau } 2257d2a7ac5dSMat Martineau 2258d2a7ac5dSMat Martineau static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq) 2259d2a7ac5dSMat Martineau { 2260bed68bdeSMat Martineau struct l2cap_ctrl control; 2261bed68bdeSMat Martineau u16 initial_head; 2262bed68bdeSMat Martineau u16 seq; 2263bed68bdeSMat Martineau 2264b4400672SAndrei Emeltchenko BT_DBG("chan %p, txseq %u", chan, txseq); 2265bed68bdeSMat Martineau 2266bed68bdeSMat Martineau memset(&control, 0, sizeof(control)); 2267bed68bdeSMat Martineau control.sframe = 1; 2268bed68bdeSMat Martineau control.super = L2CAP_SUPER_SREJ; 2269bed68bdeSMat Martineau 2270bed68bdeSMat Martineau /* Capture initial list head to allow only one pass through the list. */ 2271bed68bdeSMat Martineau initial_head = chan->srej_list.head; 2272bed68bdeSMat Martineau 2273bed68bdeSMat Martineau do { 2274bed68bdeSMat Martineau seq = l2cap_seq_list_pop(&chan->srej_list); 2275bed68bdeSMat Martineau if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR) 2276bed68bdeSMat Martineau break; 2277bed68bdeSMat Martineau 2278bed68bdeSMat Martineau control.reqseq = seq; 2279bed68bdeSMat Martineau l2cap_send_sframe(chan, &control); 2280bed68bdeSMat Martineau l2cap_seq_list_append(&chan->srej_list, seq); 2281bed68bdeSMat Martineau } while (chan->srej_list.head != initial_head); 2282d2a7ac5dSMat Martineau } 2283d2a7ac5dSMat Martineau 2284608bcc6dSMat Martineau static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq) 2285608bcc6dSMat Martineau { 2286608bcc6dSMat Martineau struct sk_buff *acked_skb; 2287608bcc6dSMat Martineau u16 ackseq; 2288608bcc6dSMat Martineau 2289b4400672SAndrei Emeltchenko BT_DBG("chan %p, reqseq %u", chan, reqseq); 2290608bcc6dSMat Martineau 2291608bcc6dSMat Martineau if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq) 2292608bcc6dSMat Martineau return; 2293608bcc6dSMat Martineau 2294b4400672SAndrei Emeltchenko BT_DBG("expected_ack_seq %u, unacked_frames %u", 2295608bcc6dSMat Martineau chan->expected_ack_seq, chan->unacked_frames); 2296608bcc6dSMat Martineau 2297608bcc6dSMat Martineau for (ackseq = chan->expected_ack_seq; ackseq != reqseq; 2298608bcc6dSMat Martineau ackseq = __next_seq(chan, ackseq)) { 2299608bcc6dSMat Martineau 2300608bcc6dSMat Martineau acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq); 2301608bcc6dSMat Martineau if (acked_skb) { 2302608bcc6dSMat Martineau skb_unlink(acked_skb, &chan->tx_q); 2303608bcc6dSMat Martineau kfree_skb(acked_skb); 2304608bcc6dSMat Martineau chan->unacked_frames--; 2305608bcc6dSMat Martineau } 2306608bcc6dSMat Martineau } 2307608bcc6dSMat Martineau 2308608bcc6dSMat Martineau chan->expected_ack_seq = reqseq; 2309608bcc6dSMat Martineau 2310608bcc6dSMat Martineau if (chan->unacked_frames == 0) 2311608bcc6dSMat Martineau __clear_retrans_timer(chan); 2312608bcc6dSMat Martineau 2313b4400672SAndrei Emeltchenko BT_DBG("unacked_frames %u", chan->unacked_frames); 2314608bcc6dSMat Martineau } 2315608bcc6dSMat Martineau 2316608bcc6dSMat Martineau static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan) 2317608bcc6dSMat Martineau { 2318608bcc6dSMat Martineau BT_DBG("chan %p", chan); 2319608bcc6dSMat Martineau 2320608bcc6dSMat Martineau chan->expected_tx_seq = chan->buffer_seq; 2321608bcc6dSMat Martineau l2cap_seq_list_clear(&chan->srej_list); 2322608bcc6dSMat Martineau skb_queue_purge(&chan->srej_q); 2323608bcc6dSMat Martineau chan->rx_state = L2CAP_RX_STATE_RECV; 2324608bcc6dSMat Martineau } 2325608bcc6dSMat Martineau 2326d660366dSGustavo Padovan static void l2cap_tx_state_xmit(struct l2cap_chan *chan, 2327608bcc6dSMat Martineau struct l2cap_ctrl *control, 2328608bcc6dSMat Martineau struct sk_buff_head *skbs, u8 event) 2329608bcc6dSMat Martineau { 2330608bcc6dSMat Martineau BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, 2331608bcc6dSMat Martineau event); 2332608bcc6dSMat Martineau 2333608bcc6dSMat Martineau switch (event) { 2334608bcc6dSMat Martineau case L2CAP_EV_DATA_REQUEST: 2335608bcc6dSMat Martineau if (chan->tx_send_head == NULL) 2336608bcc6dSMat Martineau chan->tx_send_head = skb_peek(skbs); 2337608bcc6dSMat Martineau 2338608bcc6dSMat Martineau skb_queue_splice_tail_init(skbs, &chan->tx_q); 2339608bcc6dSMat Martineau l2cap_ertm_send(chan); 2340608bcc6dSMat Martineau break; 2341608bcc6dSMat Martineau case L2CAP_EV_LOCAL_BUSY_DETECTED: 2342608bcc6dSMat Martineau BT_DBG("Enter LOCAL_BUSY"); 2343608bcc6dSMat Martineau set_bit(CONN_LOCAL_BUSY, &chan->conn_state); 2344608bcc6dSMat Martineau 2345608bcc6dSMat Martineau if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { 2346608bcc6dSMat Martineau /* The SREJ_SENT state must be aborted if we are to 2347608bcc6dSMat Martineau * enter the LOCAL_BUSY state. 2348608bcc6dSMat Martineau */ 2349608bcc6dSMat Martineau l2cap_abort_rx_srej_sent(chan); 2350608bcc6dSMat Martineau } 2351608bcc6dSMat Martineau 2352608bcc6dSMat Martineau l2cap_send_ack(chan); 2353608bcc6dSMat Martineau 2354608bcc6dSMat Martineau break; 2355608bcc6dSMat Martineau case L2CAP_EV_LOCAL_BUSY_CLEAR: 2356608bcc6dSMat Martineau BT_DBG("Exit LOCAL_BUSY"); 2357608bcc6dSMat Martineau clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); 2358608bcc6dSMat Martineau 2359608bcc6dSMat Martineau if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { 2360608bcc6dSMat Martineau struct l2cap_ctrl local_control; 2361608bcc6dSMat Martineau 2362608bcc6dSMat Martineau memset(&local_control, 0, sizeof(local_control)); 2363608bcc6dSMat Martineau local_control.sframe = 1; 2364608bcc6dSMat Martineau local_control.super = L2CAP_SUPER_RR; 2365608bcc6dSMat Martineau local_control.poll = 1; 2366608bcc6dSMat Martineau local_control.reqseq = chan->buffer_seq; 2367a67d7f6fSMat Martineau l2cap_send_sframe(chan, &local_control); 2368608bcc6dSMat Martineau 2369608bcc6dSMat Martineau chan->retry_count = 1; 2370608bcc6dSMat Martineau __set_monitor_timer(chan); 2371608bcc6dSMat Martineau chan->tx_state = L2CAP_TX_STATE_WAIT_F; 2372608bcc6dSMat Martineau } 2373608bcc6dSMat Martineau break; 2374608bcc6dSMat Martineau case L2CAP_EV_RECV_REQSEQ_AND_FBIT: 2375608bcc6dSMat Martineau l2cap_process_reqseq(chan, control->reqseq); 2376608bcc6dSMat Martineau break; 2377608bcc6dSMat Martineau case L2CAP_EV_EXPLICIT_POLL: 2378608bcc6dSMat Martineau l2cap_send_rr_or_rnr(chan, 1); 2379608bcc6dSMat Martineau chan->retry_count = 1; 2380608bcc6dSMat Martineau __set_monitor_timer(chan); 2381608bcc6dSMat Martineau __clear_ack_timer(chan); 2382608bcc6dSMat Martineau chan->tx_state = L2CAP_TX_STATE_WAIT_F; 2383608bcc6dSMat Martineau break; 2384608bcc6dSMat Martineau case L2CAP_EV_RETRANS_TO: 2385608bcc6dSMat Martineau l2cap_send_rr_or_rnr(chan, 1); 2386608bcc6dSMat Martineau chan->retry_count = 1; 2387608bcc6dSMat Martineau __set_monitor_timer(chan); 2388608bcc6dSMat Martineau chan->tx_state = L2CAP_TX_STATE_WAIT_F; 2389608bcc6dSMat Martineau break; 2390608bcc6dSMat Martineau case L2CAP_EV_RECV_FBIT: 2391608bcc6dSMat Martineau /* Nothing to process */ 2392608bcc6dSMat Martineau break; 2393608bcc6dSMat Martineau default: 2394608bcc6dSMat Martineau break; 2395608bcc6dSMat Martineau } 2396608bcc6dSMat Martineau } 2397608bcc6dSMat Martineau 2398d660366dSGustavo Padovan static void l2cap_tx_state_wait_f(struct l2cap_chan *chan, 2399608bcc6dSMat Martineau struct l2cap_ctrl *control, 2400608bcc6dSMat Martineau struct sk_buff_head *skbs, u8 event) 2401608bcc6dSMat Martineau { 2402608bcc6dSMat Martineau BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, 2403608bcc6dSMat Martineau event); 2404608bcc6dSMat Martineau 2405608bcc6dSMat Martineau switch (event) { 2406608bcc6dSMat Martineau case L2CAP_EV_DATA_REQUEST: 2407608bcc6dSMat Martineau if (chan->tx_send_head == NULL) 2408608bcc6dSMat Martineau chan->tx_send_head = skb_peek(skbs); 2409608bcc6dSMat Martineau /* Queue data, but don't send. */ 2410608bcc6dSMat Martineau skb_queue_splice_tail_init(skbs, &chan->tx_q); 2411608bcc6dSMat Martineau break; 2412608bcc6dSMat Martineau case L2CAP_EV_LOCAL_BUSY_DETECTED: 2413608bcc6dSMat Martineau BT_DBG("Enter LOCAL_BUSY"); 2414608bcc6dSMat Martineau set_bit(CONN_LOCAL_BUSY, &chan->conn_state); 2415608bcc6dSMat Martineau 2416608bcc6dSMat Martineau if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { 2417608bcc6dSMat Martineau /* The SREJ_SENT state must be aborted if we are to 2418608bcc6dSMat Martineau * enter the LOCAL_BUSY state. 2419608bcc6dSMat Martineau */ 2420608bcc6dSMat Martineau l2cap_abort_rx_srej_sent(chan); 2421608bcc6dSMat Martineau } 2422608bcc6dSMat Martineau 2423608bcc6dSMat Martineau l2cap_send_ack(chan); 2424608bcc6dSMat Martineau 2425608bcc6dSMat Martineau break; 2426608bcc6dSMat Martineau case L2CAP_EV_LOCAL_BUSY_CLEAR: 2427608bcc6dSMat Martineau BT_DBG("Exit LOCAL_BUSY"); 2428608bcc6dSMat Martineau clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); 2429608bcc6dSMat Martineau 2430608bcc6dSMat Martineau if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { 2431608bcc6dSMat Martineau struct l2cap_ctrl local_control; 2432608bcc6dSMat Martineau memset(&local_control, 0, sizeof(local_control)); 2433608bcc6dSMat Martineau local_control.sframe = 1; 2434608bcc6dSMat Martineau local_control.super = L2CAP_SUPER_RR; 2435608bcc6dSMat Martineau local_control.poll = 1; 2436608bcc6dSMat Martineau local_control.reqseq = chan->buffer_seq; 2437a67d7f6fSMat Martineau l2cap_send_sframe(chan, &local_control); 2438608bcc6dSMat Martineau 2439608bcc6dSMat Martineau chan->retry_count = 1; 2440608bcc6dSMat Martineau __set_monitor_timer(chan); 2441608bcc6dSMat Martineau chan->tx_state = L2CAP_TX_STATE_WAIT_F; 2442608bcc6dSMat Martineau } 2443608bcc6dSMat Martineau break; 2444608bcc6dSMat Martineau case L2CAP_EV_RECV_REQSEQ_AND_FBIT: 2445608bcc6dSMat Martineau l2cap_process_reqseq(chan, control->reqseq); 2446608bcc6dSMat Martineau 2447608bcc6dSMat Martineau /* Fall through */ 2448608bcc6dSMat Martineau 2449608bcc6dSMat Martineau case L2CAP_EV_RECV_FBIT: 2450608bcc6dSMat Martineau if (control && control->final) { 2451608bcc6dSMat Martineau __clear_monitor_timer(chan); 2452608bcc6dSMat Martineau if (chan->unacked_frames > 0) 2453608bcc6dSMat Martineau __set_retrans_timer(chan); 2454608bcc6dSMat Martineau chan->retry_count = 0; 2455608bcc6dSMat Martineau chan->tx_state = L2CAP_TX_STATE_XMIT; 2456608bcc6dSMat Martineau BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state); 2457608bcc6dSMat Martineau } 2458608bcc6dSMat Martineau break; 2459608bcc6dSMat Martineau case L2CAP_EV_EXPLICIT_POLL: 2460608bcc6dSMat Martineau /* Ignore */ 2461608bcc6dSMat Martineau break; 2462608bcc6dSMat Martineau case L2CAP_EV_MONITOR_TO: 2463608bcc6dSMat Martineau if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) { 2464608bcc6dSMat Martineau l2cap_send_rr_or_rnr(chan, 1); 2465608bcc6dSMat Martineau __set_monitor_timer(chan); 2466608bcc6dSMat Martineau chan->retry_count++; 2467608bcc6dSMat Martineau } else { 2468608bcc6dSMat Martineau l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); 2469608bcc6dSMat Martineau } 2470608bcc6dSMat Martineau break; 2471608bcc6dSMat Martineau default: 2472608bcc6dSMat Martineau break; 2473608bcc6dSMat Martineau } 2474608bcc6dSMat Martineau } 2475608bcc6dSMat Martineau 2476d660366dSGustavo Padovan static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, 2477608bcc6dSMat Martineau struct sk_buff_head *skbs, u8 event) 2478608bcc6dSMat Martineau { 2479608bcc6dSMat Martineau BT_DBG("chan %p, control %p, skbs %p, event %d, state %d", 2480608bcc6dSMat Martineau chan, control, skbs, event, chan->tx_state); 2481608bcc6dSMat Martineau 2482608bcc6dSMat Martineau switch (chan->tx_state) { 2483608bcc6dSMat Martineau case L2CAP_TX_STATE_XMIT: 2484d660366dSGustavo Padovan l2cap_tx_state_xmit(chan, control, skbs, event); 2485608bcc6dSMat Martineau break; 2486608bcc6dSMat Martineau case L2CAP_TX_STATE_WAIT_F: 2487d660366dSGustavo Padovan l2cap_tx_state_wait_f(chan, control, skbs, event); 2488608bcc6dSMat Martineau break; 2489608bcc6dSMat Martineau default: 2490608bcc6dSMat Martineau /* Ignore event */ 2491608bcc6dSMat Martineau break; 2492608bcc6dSMat Martineau } 2493608bcc6dSMat Martineau } 2494608bcc6dSMat Martineau 24954b51dae9SMat Martineau static void l2cap_pass_to_tx(struct l2cap_chan *chan, 24964b51dae9SMat Martineau struct l2cap_ctrl *control) 24974b51dae9SMat Martineau { 24984b51dae9SMat Martineau BT_DBG("chan %p, control %p", chan, control); 2499401bb1f7SAndrei Emeltchenko l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_REQSEQ_AND_FBIT); 25004b51dae9SMat Martineau } 25014b51dae9SMat Martineau 2502f80842a8SMat Martineau static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan, 2503f80842a8SMat Martineau struct l2cap_ctrl *control) 2504f80842a8SMat Martineau { 2505f80842a8SMat Martineau BT_DBG("chan %p, control %p", chan, control); 2506401bb1f7SAndrei Emeltchenko l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_FBIT); 2507f80842a8SMat Martineau } 2508f80842a8SMat Martineau 25090a708f8fSGustavo F. Padovan /* Copy frame to all raw sockets on that connection */ 25100a708f8fSGustavo F. Padovan static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) 25110a708f8fSGustavo F. Padovan { 25120a708f8fSGustavo F. Padovan struct sk_buff *nskb; 251348454079SGustavo F. Padovan struct l2cap_chan *chan; 25140a708f8fSGustavo F. Padovan 25150a708f8fSGustavo F. Padovan BT_DBG("conn %p", conn); 25160a708f8fSGustavo F. Padovan 25173df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 25183d57dc68SGustavo F. Padovan 25193df91ea2SAndrei Emeltchenko list_for_each_entry(chan, &conn->chan_l, list) { 252048454079SGustavo F. Padovan struct sock *sk = chan->sk; 2521715ec005SGustavo F. Padovan if (chan->chan_type != L2CAP_CHAN_RAW) 25220a708f8fSGustavo F. Padovan continue; 25230a708f8fSGustavo F. Padovan 25240a708f8fSGustavo F. Padovan /* Don't send frame to the socket it came from */ 25250a708f8fSGustavo F. Padovan if (skb->sk == sk) 25260a708f8fSGustavo F. Padovan continue; 25270a708f8fSGustavo F. Padovan nskb = skb_clone(skb, GFP_ATOMIC); 25280a708f8fSGustavo F. Padovan if (!nskb) 25290a708f8fSGustavo F. Padovan continue; 25300a708f8fSGustavo F. Padovan 253180b98027SGustavo Padovan if (chan->ops->recv(chan, nskb)) 25320a708f8fSGustavo F. Padovan kfree_skb(nskb); 25330a708f8fSGustavo F. Padovan } 25343d57dc68SGustavo F. Padovan 25353df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 25360a708f8fSGustavo F. Padovan } 25370a708f8fSGustavo F. Padovan 25380a708f8fSGustavo F. Padovan /* ---- L2CAP signalling commands ---- */ 2539b4400672SAndrei Emeltchenko static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code, 2540b4400672SAndrei Emeltchenko u8 ident, u16 dlen, void *data) 25410a708f8fSGustavo F. Padovan { 25420a708f8fSGustavo F. Padovan struct sk_buff *skb, **frag; 25430a708f8fSGustavo F. Padovan struct l2cap_cmd_hdr *cmd; 25440a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 25450a708f8fSGustavo F. Padovan int len, count; 25460a708f8fSGustavo F. Padovan 2547b4400672SAndrei Emeltchenko BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %u", 25480a708f8fSGustavo F. Padovan conn, code, ident, dlen); 25490a708f8fSGustavo F. Padovan 25500a708f8fSGustavo F. Padovan len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; 25510a708f8fSGustavo F. Padovan count = min_t(unsigned int, conn->mtu, len); 25520a708f8fSGustavo F. Padovan 25530a708f8fSGustavo F. Padovan skb = bt_skb_alloc(count, GFP_ATOMIC); 25540a708f8fSGustavo F. Padovan if (!skb) 25550a708f8fSGustavo F. Padovan return NULL; 25560a708f8fSGustavo F. Padovan 25570a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 25580a708f8fSGustavo F. Padovan lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); 25593300d9a9SClaudio Takahasi 25603300d9a9SClaudio Takahasi if (conn->hcon->type == LE_LINK) 2561ac73498cSAndrei Emeltchenko lh->cid = __constant_cpu_to_le16(L2CAP_CID_LE_SIGNALING); 25623300d9a9SClaudio Takahasi else 2563ac73498cSAndrei Emeltchenko lh->cid = __constant_cpu_to_le16(L2CAP_CID_SIGNALING); 25640a708f8fSGustavo F. Padovan 25650a708f8fSGustavo F. Padovan cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); 25660a708f8fSGustavo F. Padovan cmd->code = code; 25670a708f8fSGustavo F. Padovan cmd->ident = ident; 25680a708f8fSGustavo F. Padovan cmd->len = cpu_to_le16(dlen); 25690a708f8fSGustavo F. Padovan 25700a708f8fSGustavo F. Padovan if (dlen) { 25710a708f8fSGustavo F. Padovan count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; 25720a708f8fSGustavo F. Padovan memcpy(skb_put(skb, count), data, count); 25730a708f8fSGustavo F. Padovan data += count; 25740a708f8fSGustavo F. Padovan } 25750a708f8fSGustavo F. Padovan 25760a708f8fSGustavo F. Padovan len -= skb->len; 25770a708f8fSGustavo F. Padovan 25780a708f8fSGustavo F. Padovan /* Continuation fragments (no L2CAP header) */ 25790a708f8fSGustavo F. Padovan frag = &skb_shinfo(skb)->frag_list; 25800a708f8fSGustavo F. Padovan while (len) { 25810a708f8fSGustavo F. Padovan count = min_t(unsigned int, conn->mtu, len); 25820a708f8fSGustavo F. Padovan 25830a708f8fSGustavo F. Padovan *frag = bt_skb_alloc(count, GFP_ATOMIC); 25840a708f8fSGustavo F. Padovan if (!*frag) 25850a708f8fSGustavo F. Padovan goto fail; 25860a708f8fSGustavo F. Padovan 25870a708f8fSGustavo F. Padovan memcpy(skb_put(*frag, count), data, count); 25880a708f8fSGustavo F. Padovan 25890a708f8fSGustavo F. Padovan len -= count; 25900a708f8fSGustavo F. Padovan data += count; 25910a708f8fSGustavo F. Padovan 25920a708f8fSGustavo F. Padovan frag = &(*frag)->next; 25930a708f8fSGustavo F. Padovan } 25940a708f8fSGustavo F. Padovan 25950a708f8fSGustavo F. Padovan return skb; 25960a708f8fSGustavo F. Padovan 25970a708f8fSGustavo F. Padovan fail: 25980a708f8fSGustavo F. Padovan kfree_skb(skb); 25990a708f8fSGustavo F. Padovan return NULL; 26000a708f8fSGustavo F. Padovan } 26010a708f8fSGustavo F. Padovan 26020a708f8fSGustavo F. Padovan static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val) 26030a708f8fSGustavo F. Padovan { 26040a708f8fSGustavo F. Padovan struct l2cap_conf_opt *opt = *ptr; 26050a708f8fSGustavo F. Padovan int len; 26060a708f8fSGustavo F. Padovan 26070a708f8fSGustavo F. Padovan len = L2CAP_CONF_OPT_SIZE + opt->len; 26080a708f8fSGustavo F. Padovan *ptr += len; 26090a708f8fSGustavo F. Padovan 26100a708f8fSGustavo F. Padovan *type = opt->type; 26110a708f8fSGustavo F. Padovan *olen = opt->len; 26120a708f8fSGustavo F. Padovan 26130a708f8fSGustavo F. Padovan switch (opt->len) { 26140a708f8fSGustavo F. Padovan case 1: 26150a708f8fSGustavo F. Padovan *val = *((u8 *) opt->val); 26160a708f8fSGustavo F. Padovan break; 26170a708f8fSGustavo F. Padovan 26180a708f8fSGustavo F. Padovan case 2: 26190a708f8fSGustavo F. Padovan *val = get_unaligned_le16(opt->val); 26200a708f8fSGustavo F. Padovan break; 26210a708f8fSGustavo F. Padovan 26220a708f8fSGustavo F. Padovan case 4: 26230a708f8fSGustavo F. Padovan *val = get_unaligned_le32(opt->val); 26240a708f8fSGustavo F. Padovan break; 26250a708f8fSGustavo F. Padovan 26260a708f8fSGustavo F. Padovan default: 26270a708f8fSGustavo F. Padovan *val = (unsigned long) opt->val; 26280a708f8fSGustavo F. Padovan break; 26290a708f8fSGustavo F. Padovan } 26300a708f8fSGustavo F. Padovan 2631b4400672SAndrei Emeltchenko BT_DBG("type 0x%2.2x len %u val 0x%lx", *type, opt->len, *val); 26320a708f8fSGustavo F. Padovan return len; 26330a708f8fSGustavo F. Padovan } 26340a708f8fSGustavo F. Padovan 26350a708f8fSGustavo F. Padovan static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) 26360a708f8fSGustavo F. Padovan { 26370a708f8fSGustavo F. Padovan struct l2cap_conf_opt *opt = *ptr; 26380a708f8fSGustavo F. Padovan 2639b4400672SAndrei Emeltchenko BT_DBG("type 0x%2.2x len %u val 0x%lx", type, len, val); 26400a708f8fSGustavo F. Padovan 26410a708f8fSGustavo F. Padovan opt->type = type; 26420a708f8fSGustavo F. Padovan opt->len = len; 26430a708f8fSGustavo F. Padovan 26440a708f8fSGustavo F. Padovan switch (len) { 26450a708f8fSGustavo F. Padovan case 1: 26460a708f8fSGustavo F. Padovan *((u8 *) opt->val) = val; 26470a708f8fSGustavo F. Padovan break; 26480a708f8fSGustavo F. Padovan 26490a708f8fSGustavo F. Padovan case 2: 26500a708f8fSGustavo F. Padovan put_unaligned_le16(val, opt->val); 26510a708f8fSGustavo F. Padovan break; 26520a708f8fSGustavo F. Padovan 26530a708f8fSGustavo F. Padovan case 4: 26540a708f8fSGustavo F. Padovan put_unaligned_le32(val, opt->val); 26550a708f8fSGustavo F. Padovan break; 26560a708f8fSGustavo F. Padovan 26570a708f8fSGustavo F. Padovan default: 26580a708f8fSGustavo F. Padovan memcpy(opt->val, (void *) val, len); 26590a708f8fSGustavo F. Padovan break; 26600a708f8fSGustavo F. Padovan } 26610a708f8fSGustavo F. Padovan 26620a708f8fSGustavo F. Padovan *ptr += L2CAP_CONF_OPT_SIZE + len; 26630a708f8fSGustavo F. Padovan } 26640a708f8fSGustavo F. Padovan 2665f89cef09SAndrei Emeltchenko static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan) 2666f89cef09SAndrei Emeltchenko { 2667f89cef09SAndrei Emeltchenko struct l2cap_conf_efs efs; 2668f89cef09SAndrei Emeltchenko 2669f89cef09SAndrei Emeltchenko switch (chan->mode) { 2670f89cef09SAndrei Emeltchenko case L2CAP_MODE_ERTM: 2671f89cef09SAndrei Emeltchenko efs.id = chan->local_id; 2672f89cef09SAndrei Emeltchenko efs.stype = chan->local_stype; 2673f89cef09SAndrei Emeltchenko efs.msdu = cpu_to_le16(chan->local_msdu); 2674f89cef09SAndrei Emeltchenko efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); 2675ac73498cSAndrei Emeltchenko efs.acc_lat = __constant_cpu_to_le32(L2CAP_DEFAULT_ACC_LAT); 2676ac73498cSAndrei Emeltchenko efs.flush_to = __constant_cpu_to_le32(L2CAP_DEFAULT_FLUSH_TO); 2677f89cef09SAndrei Emeltchenko break; 2678f89cef09SAndrei Emeltchenko 2679f89cef09SAndrei Emeltchenko case L2CAP_MODE_STREAMING: 2680f89cef09SAndrei Emeltchenko efs.id = 1; 2681f89cef09SAndrei Emeltchenko efs.stype = L2CAP_SERV_BESTEFFORT; 2682f89cef09SAndrei Emeltchenko efs.msdu = cpu_to_le16(chan->local_msdu); 2683f89cef09SAndrei Emeltchenko efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); 2684f89cef09SAndrei Emeltchenko efs.acc_lat = 0; 2685f89cef09SAndrei Emeltchenko efs.flush_to = 0; 2686f89cef09SAndrei Emeltchenko break; 2687f89cef09SAndrei Emeltchenko 2688f89cef09SAndrei Emeltchenko default: 2689f89cef09SAndrei Emeltchenko return; 2690f89cef09SAndrei Emeltchenko } 2691f89cef09SAndrei Emeltchenko 2692f89cef09SAndrei Emeltchenko l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs), 2693f89cef09SAndrei Emeltchenko (unsigned long) &efs); 2694f89cef09SAndrei Emeltchenko } 2695f89cef09SAndrei Emeltchenko 2696721c4181SGustavo F. Padovan static void l2cap_ack_timeout(struct work_struct *work) 26970a708f8fSGustavo F. Padovan { 2698721c4181SGustavo F. Padovan struct l2cap_chan *chan = container_of(work, struct l2cap_chan, 2699721c4181SGustavo F. Padovan ack_timer.work); 27000362520bSMat Martineau u16 frames_to_ack; 27010a708f8fSGustavo F. Padovan 27022fb9b3d4SGustavo F. Padovan BT_DBG("chan %p", chan); 27032fb9b3d4SGustavo F. Padovan 27046be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 27056be36555SAndrei Emeltchenko 27060362520bSMat Martineau frames_to_ack = __seq_offset(chan, chan->buffer_seq, 27070362520bSMat Martineau chan->last_acked_seq); 27080362520bSMat Martineau 27090362520bSMat Martineau if (frames_to_ack) 27100362520bSMat Martineau l2cap_send_rr_or_rnr(chan, 0); 27116be36555SAndrei Emeltchenko 27126be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 271309bfb2eeSSzymon Janc l2cap_chan_put(chan); 27140a708f8fSGustavo F. Padovan } 27150a708f8fSGustavo F. Padovan 2716466f8004SAndrei Emeltchenko int l2cap_ertm_init(struct l2cap_chan *chan) 27170a708f8fSGustavo F. Padovan { 27183c588192SMat Martineau int err; 27193c588192SMat Martineau 2720105bdf9eSMat Martineau chan->next_tx_seq = 0; 2721105bdf9eSMat Martineau chan->expected_tx_seq = 0; 272242e5c802SGustavo F. Padovan chan->expected_ack_seq = 0; 27236a026610SGustavo F. Padovan chan->unacked_frames = 0; 272442e5c802SGustavo F. Padovan chan->buffer_seq = 0; 27256a026610SGustavo F. Padovan chan->frames_sent = 0; 2726105bdf9eSMat Martineau chan->last_acked_seq = 0; 2727105bdf9eSMat Martineau chan->sdu = NULL; 2728105bdf9eSMat Martineau chan->sdu_last_frag = NULL; 2729105bdf9eSMat Martineau chan->sdu_len = 0; 2730105bdf9eSMat Martineau 2731d34c34fbSMat Martineau skb_queue_head_init(&chan->tx_q); 2732d34c34fbSMat Martineau 2733105bdf9eSMat Martineau if (chan->mode != L2CAP_MODE_ERTM) 2734105bdf9eSMat Martineau return 0; 2735105bdf9eSMat Martineau 2736105bdf9eSMat Martineau chan->rx_state = L2CAP_RX_STATE_RECV; 2737105bdf9eSMat Martineau chan->tx_state = L2CAP_TX_STATE_XMIT; 27380a708f8fSGustavo F. Padovan 2739721c4181SGustavo F. Padovan INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout); 2740721c4181SGustavo F. Padovan INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout); 2741721c4181SGustavo F. Padovan INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout); 27420a708f8fSGustavo F. Padovan 2743f1c6775bSGustavo F. Padovan skb_queue_head_init(&chan->srej_q); 27440a708f8fSGustavo F. Padovan 27453c588192SMat Martineau err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win); 27463c588192SMat Martineau if (err < 0) 27473c588192SMat Martineau return err; 27483c588192SMat Martineau 27499dc9affcSMat Martineau err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win); 27509dc9affcSMat Martineau if (err < 0) 27519dc9affcSMat Martineau l2cap_seq_list_free(&chan->srej_list); 27529dc9affcSMat Martineau 27539dc9affcSMat Martineau return err; 27540a708f8fSGustavo F. Padovan } 27550a708f8fSGustavo F. Padovan 27560a708f8fSGustavo F. Padovan static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) 27570a708f8fSGustavo F. Padovan { 27580a708f8fSGustavo F. Padovan switch (mode) { 27590a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 27600a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 27610a708f8fSGustavo F. Padovan if (l2cap_mode_supported(mode, remote_feat_mask)) 27620a708f8fSGustavo F. Padovan return mode; 27630a708f8fSGustavo F. Padovan /* fall through */ 27640a708f8fSGustavo F. Padovan default: 27650a708f8fSGustavo F. Padovan return L2CAP_MODE_BASIC; 27660a708f8fSGustavo F. Padovan } 27670a708f8fSGustavo F. Padovan } 27680a708f8fSGustavo F. Padovan 27696327eb98SAndrei Emeltchenko static inline bool __l2cap_ews_supported(struct l2cap_chan *chan) 27706327eb98SAndrei Emeltchenko { 27716327eb98SAndrei Emeltchenko return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_WINDOW; 27726327eb98SAndrei Emeltchenko } 27736327eb98SAndrei Emeltchenko 2774f89cef09SAndrei Emeltchenko static inline bool __l2cap_efs_supported(struct l2cap_chan *chan) 2775f89cef09SAndrei Emeltchenko { 2776f89cef09SAndrei Emeltchenko return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_FLOW; 2777f89cef09SAndrei Emeltchenko } 2778f89cef09SAndrei Emeltchenko 27796327eb98SAndrei Emeltchenko static inline void l2cap_txwin_setup(struct l2cap_chan *chan) 27806327eb98SAndrei Emeltchenko { 27816327eb98SAndrei Emeltchenko if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW && 2782836be934SAndrei Emeltchenko __l2cap_ews_supported(chan)) { 27836327eb98SAndrei Emeltchenko /* use extended control field */ 27846327eb98SAndrei Emeltchenko set_bit(FLAG_EXT_CTRL, &chan->flags); 2785836be934SAndrei Emeltchenko chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; 2786836be934SAndrei Emeltchenko } else { 27876327eb98SAndrei Emeltchenko chan->tx_win = min_t(u16, chan->tx_win, 27886327eb98SAndrei Emeltchenko L2CAP_DEFAULT_TX_WINDOW); 2789836be934SAndrei Emeltchenko chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; 2790836be934SAndrei Emeltchenko } 2791c20f8e35SMat Martineau chan->ack_win = chan->tx_win; 27926327eb98SAndrei Emeltchenko } 27936327eb98SAndrei Emeltchenko 2794710f9b0aSGustavo F. Padovan static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data) 27950a708f8fSGustavo F. Padovan { 27960a708f8fSGustavo F. Padovan struct l2cap_conf_req *req = data; 27970c1bc5c6SGustavo F. Padovan struct l2cap_conf_rfc rfc = { .mode = chan->mode }; 27980a708f8fSGustavo F. Padovan void *ptr = req->data; 2799c8f79162SAndrei Emeltchenko u16 size; 28000a708f8fSGustavo F. Padovan 280149208c9cSGustavo F. Padovan BT_DBG("chan %p", chan); 28020a708f8fSGustavo F. Padovan 280373ffa904SGustavo F. Padovan if (chan->num_conf_req || chan->num_conf_rsp) 28040a708f8fSGustavo F. Padovan goto done; 28050a708f8fSGustavo F. Padovan 28060c1bc5c6SGustavo F. Padovan switch (chan->mode) { 28070a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 28080a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 2809c1360a1cSGustavo F. Padovan if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) 28100a708f8fSGustavo F. Padovan break; 28110a708f8fSGustavo F. Padovan 2812f89cef09SAndrei Emeltchenko if (__l2cap_efs_supported(chan)) 2813f89cef09SAndrei Emeltchenko set_bit(FLAG_EFS_ENABLE, &chan->flags); 2814f89cef09SAndrei Emeltchenko 28150a708f8fSGustavo F. Padovan /* fall through */ 28160a708f8fSGustavo F. Padovan default: 28178c1d787bSGustavo F. Padovan chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask); 28180a708f8fSGustavo F. Padovan break; 28190a708f8fSGustavo F. Padovan } 28200a708f8fSGustavo F. Padovan 28210a708f8fSGustavo F. Padovan done: 28220c1bc5c6SGustavo F. Padovan if (chan->imtu != L2CAP_DEFAULT_MTU) 28230c1bc5c6SGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); 28240a708f8fSGustavo F. Padovan 28250c1bc5c6SGustavo F. Padovan switch (chan->mode) { 28260a708f8fSGustavo F. Padovan case L2CAP_MODE_BASIC: 28278c1d787bSGustavo F. Padovan if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) && 28288c1d787bSGustavo F. Padovan !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING)) 28290a708f8fSGustavo F. Padovan break; 28300a708f8fSGustavo F. Padovan 28310a708f8fSGustavo F. Padovan rfc.mode = L2CAP_MODE_BASIC; 28320a708f8fSGustavo F. Padovan rfc.txwin_size = 0; 28330a708f8fSGustavo F. Padovan rfc.max_transmit = 0; 28340a708f8fSGustavo F. Padovan rfc.retrans_timeout = 0; 28350a708f8fSGustavo F. Padovan rfc.monitor_timeout = 0; 28360a708f8fSGustavo F. Padovan rfc.max_pdu_size = 0; 28370a708f8fSGustavo F. Padovan 28380a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), 28390a708f8fSGustavo F. Padovan (unsigned long) &rfc); 28400a708f8fSGustavo F. Padovan break; 28410a708f8fSGustavo F. Padovan 28420a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 28430a708f8fSGustavo F. Padovan rfc.mode = L2CAP_MODE_ERTM; 284447d1ec61SGustavo F. Padovan rfc.max_transmit = chan->max_tx; 28450a708f8fSGustavo F. Padovan rfc.retrans_timeout = 0; 28460a708f8fSGustavo F. Padovan rfc.monitor_timeout = 0; 2847c8f79162SAndrei Emeltchenko 2848c8f79162SAndrei Emeltchenko size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - 2849c8f79162SAndrei Emeltchenko L2CAP_EXT_HDR_SIZE - 2850c8f79162SAndrei Emeltchenko L2CAP_SDULEN_SIZE - 2851c8f79162SAndrei Emeltchenko L2CAP_FCS_SIZE); 2852c8f79162SAndrei Emeltchenko rfc.max_pdu_size = cpu_to_le16(size); 28530a708f8fSGustavo F. Padovan 28546327eb98SAndrei Emeltchenko l2cap_txwin_setup(chan); 28556327eb98SAndrei Emeltchenko 28566327eb98SAndrei Emeltchenko rfc.txwin_size = min_t(u16, chan->tx_win, 28576327eb98SAndrei Emeltchenko L2CAP_DEFAULT_TX_WINDOW); 28580a708f8fSGustavo F. Padovan 28590a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), 28600a708f8fSGustavo F. Padovan (unsigned long) &rfc); 28610a708f8fSGustavo F. Padovan 2862f89cef09SAndrei Emeltchenko if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) 2863f89cef09SAndrei Emeltchenko l2cap_add_opt_efs(&ptr, chan); 2864f89cef09SAndrei Emeltchenko 28658c1d787bSGustavo F. Padovan if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) 28660a708f8fSGustavo F. Padovan break; 28670a708f8fSGustavo F. Padovan 286847d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_NONE || 2869c1360a1cSGustavo F. Padovan test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { 287047d1ec61SGustavo F. Padovan chan->fcs = L2CAP_FCS_NONE; 287147d1ec61SGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); 28720a708f8fSGustavo F. Padovan } 28736327eb98SAndrei Emeltchenko 28746327eb98SAndrei Emeltchenko if (test_bit(FLAG_EXT_CTRL, &chan->flags)) 28756327eb98SAndrei Emeltchenko l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, 28766327eb98SAndrei Emeltchenko chan->tx_win); 28770a708f8fSGustavo F. Padovan break; 28780a708f8fSGustavo F. Padovan 28790a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 2880273759e2SMat Martineau l2cap_txwin_setup(chan); 28810a708f8fSGustavo F. Padovan rfc.mode = L2CAP_MODE_STREAMING; 28820a708f8fSGustavo F. Padovan rfc.txwin_size = 0; 28830a708f8fSGustavo F. Padovan rfc.max_transmit = 0; 28840a708f8fSGustavo F. Padovan rfc.retrans_timeout = 0; 28850a708f8fSGustavo F. Padovan rfc.monitor_timeout = 0; 2886c8f79162SAndrei Emeltchenko 2887c8f79162SAndrei Emeltchenko size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - 2888c8f79162SAndrei Emeltchenko L2CAP_EXT_HDR_SIZE - 2889c8f79162SAndrei Emeltchenko L2CAP_SDULEN_SIZE - 2890c8f79162SAndrei Emeltchenko L2CAP_FCS_SIZE); 2891c8f79162SAndrei Emeltchenko rfc.max_pdu_size = cpu_to_le16(size); 28920a708f8fSGustavo F. Padovan 28930a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), 28940a708f8fSGustavo F. Padovan (unsigned long) &rfc); 28950a708f8fSGustavo F. Padovan 2896f89cef09SAndrei Emeltchenko if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) 2897f89cef09SAndrei Emeltchenko l2cap_add_opt_efs(&ptr, chan); 2898f89cef09SAndrei Emeltchenko 28998c1d787bSGustavo F. Padovan if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) 29000a708f8fSGustavo F. Padovan break; 29010a708f8fSGustavo F. Padovan 290247d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_NONE || 2903c1360a1cSGustavo F. Padovan test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { 290447d1ec61SGustavo F. Padovan chan->fcs = L2CAP_FCS_NONE; 290547d1ec61SGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); 29060a708f8fSGustavo F. Padovan } 29070a708f8fSGustavo F. Padovan break; 29080a708f8fSGustavo F. Padovan } 29090a708f8fSGustavo F. Padovan 2910fe4128e0SGustavo F. Padovan req->dcid = cpu_to_le16(chan->dcid); 291159e54bd1SAndrei Emeltchenko req->flags = __constant_cpu_to_le16(0); 29120a708f8fSGustavo F. Padovan 29130a708f8fSGustavo F. Padovan return ptr - data; 29140a708f8fSGustavo F. Padovan } 29150a708f8fSGustavo F. Padovan 291673ffa904SGustavo F. Padovan static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data) 29170a708f8fSGustavo F. Padovan { 29180a708f8fSGustavo F. Padovan struct l2cap_conf_rsp *rsp = data; 29190a708f8fSGustavo F. Padovan void *ptr = rsp->data; 292073ffa904SGustavo F. Padovan void *req = chan->conf_req; 292173ffa904SGustavo F. Padovan int len = chan->conf_len; 29220a708f8fSGustavo F. Padovan int type, hint, olen; 29230a708f8fSGustavo F. Padovan unsigned long val; 29240a708f8fSGustavo F. Padovan struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; 292542dceae2SAndrei Emeltchenko struct l2cap_conf_efs efs; 292642dceae2SAndrei Emeltchenko u8 remote_efs = 0; 29270a708f8fSGustavo F. Padovan u16 mtu = L2CAP_DEFAULT_MTU; 29280a708f8fSGustavo F. Padovan u16 result = L2CAP_CONF_SUCCESS; 2929c8f79162SAndrei Emeltchenko u16 size; 29300a708f8fSGustavo F. Padovan 293173ffa904SGustavo F. Padovan BT_DBG("chan %p", chan); 29320a708f8fSGustavo F. Padovan 29330a708f8fSGustavo F. Padovan while (len >= L2CAP_CONF_OPT_SIZE) { 29340a708f8fSGustavo F. Padovan len -= l2cap_get_conf_opt(&req, &type, &olen, &val); 29350a708f8fSGustavo F. Padovan 29360a708f8fSGustavo F. Padovan hint = type & L2CAP_CONF_HINT; 29370a708f8fSGustavo F. Padovan type &= L2CAP_CONF_MASK; 29380a708f8fSGustavo F. Padovan 29390a708f8fSGustavo F. Padovan switch (type) { 29400a708f8fSGustavo F. Padovan case L2CAP_CONF_MTU: 29410a708f8fSGustavo F. Padovan mtu = val; 29420a708f8fSGustavo F. Padovan break; 29430a708f8fSGustavo F. Padovan 29440a708f8fSGustavo F. Padovan case L2CAP_CONF_FLUSH_TO: 29450c1bc5c6SGustavo F. Padovan chan->flush_to = val; 29460a708f8fSGustavo F. Padovan break; 29470a708f8fSGustavo F. Padovan 29480a708f8fSGustavo F. Padovan case L2CAP_CONF_QOS: 29490a708f8fSGustavo F. Padovan break; 29500a708f8fSGustavo F. Padovan 29510a708f8fSGustavo F. Padovan case L2CAP_CONF_RFC: 29520a708f8fSGustavo F. Padovan if (olen == sizeof(rfc)) 29530a708f8fSGustavo F. Padovan memcpy(&rfc, (void *) val, olen); 29540a708f8fSGustavo F. Padovan break; 29550a708f8fSGustavo F. Padovan 29560a708f8fSGustavo F. Padovan case L2CAP_CONF_FCS: 29570a708f8fSGustavo F. Padovan if (val == L2CAP_FCS_NONE) 2958c1360a1cSGustavo F. Padovan set_bit(CONF_NO_FCS_RECV, &chan->conf_state); 295942dceae2SAndrei Emeltchenko break; 29600a708f8fSGustavo F. Padovan 296142dceae2SAndrei Emeltchenko case L2CAP_CONF_EFS: 296242dceae2SAndrei Emeltchenko remote_efs = 1; 296342dceae2SAndrei Emeltchenko if (olen == sizeof(efs)) 296442dceae2SAndrei Emeltchenko memcpy(&efs, (void *) val, olen); 29650a708f8fSGustavo F. Padovan break; 29660a708f8fSGustavo F. Padovan 29676327eb98SAndrei Emeltchenko case L2CAP_CONF_EWS: 29686327eb98SAndrei Emeltchenko if (!enable_hs) 29696327eb98SAndrei Emeltchenko return -ECONNREFUSED; 29706327eb98SAndrei Emeltchenko 29716327eb98SAndrei Emeltchenko set_bit(FLAG_EXT_CTRL, &chan->flags); 29726327eb98SAndrei Emeltchenko set_bit(CONF_EWS_RECV, &chan->conf_state); 2973836be934SAndrei Emeltchenko chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; 29746327eb98SAndrei Emeltchenko chan->remote_tx_win = val; 29750a708f8fSGustavo F. Padovan break; 29760a708f8fSGustavo F. Padovan 29770a708f8fSGustavo F. Padovan default: 29780a708f8fSGustavo F. Padovan if (hint) 29790a708f8fSGustavo F. Padovan break; 29800a708f8fSGustavo F. Padovan 29810a708f8fSGustavo F. Padovan result = L2CAP_CONF_UNKNOWN; 29820a708f8fSGustavo F. Padovan *((u8 *) ptr++) = type; 29830a708f8fSGustavo F. Padovan break; 29840a708f8fSGustavo F. Padovan } 29850a708f8fSGustavo F. Padovan } 29860a708f8fSGustavo F. Padovan 298773ffa904SGustavo F. Padovan if (chan->num_conf_rsp || chan->num_conf_req > 1) 29880a708f8fSGustavo F. Padovan goto done; 29890a708f8fSGustavo F. Padovan 29900c1bc5c6SGustavo F. Padovan switch (chan->mode) { 29910a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 29920a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 2993c1360a1cSGustavo F. Padovan if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) { 29940c1bc5c6SGustavo F. Padovan chan->mode = l2cap_select_mode(rfc.mode, 29958c1d787bSGustavo F. Padovan chan->conn->feat_mask); 29960a708f8fSGustavo F. Padovan break; 29970a708f8fSGustavo F. Padovan } 29980a708f8fSGustavo F. Padovan 299942dceae2SAndrei Emeltchenko if (remote_efs) { 300042dceae2SAndrei Emeltchenko if (__l2cap_efs_supported(chan)) 300142dceae2SAndrei Emeltchenko set_bit(FLAG_EFS_ENABLE, &chan->flags); 300242dceae2SAndrei Emeltchenko else 300342dceae2SAndrei Emeltchenko return -ECONNREFUSED; 300442dceae2SAndrei Emeltchenko } 300542dceae2SAndrei Emeltchenko 30060c1bc5c6SGustavo F. Padovan if (chan->mode != rfc.mode) 30070a708f8fSGustavo F. Padovan return -ECONNREFUSED; 30080a708f8fSGustavo F. Padovan 30090a708f8fSGustavo F. Padovan break; 30100a708f8fSGustavo F. Padovan } 30110a708f8fSGustavo F. Padovan 30120a708f8fSGustavo F. Padovan done: 30130c1bc5c6SGustavo F. Padovan if (chan->mode != rfc.mode) { 30140a708f8fSGustavo F. Padovan result = L2CAP_CONF_UNACCEPT; 30150c1bc5c6SGustavo F. Padovan rfc.mode = chan->mode; 30160a708f8fSGustavo F. Padovan 301773ffa904SGustavo F. Padovan if (chan->num_conf_rsp == 1) 30180a708f8fSGustavo F. Padovan return -ECONNREFUSED; 30190a708f8fSGustavo F. Padovan 30200a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, 30210a708f8fSGustavo F. Padovan sizeof(rfc), (unsigned long) &rfc); 30220a708f8fSGustavo F. Padovan } 30230a708f8fSGustavo F. Padovan 30240a708f8fSGustavo F. Padovan if (result == L2CAP_CONF_SUCCESS) { 30250a708f8fSGustavo F. Padovan /* Configure output options and let the other side know 30260a708f8fSGustavo F. Padovan * which ones we don't like. */ 30270a708f8fSGustavo F. Padovan 30280a708f8fSGustavo F. Padovan if (mtu < L2CAP_DEFAULT_MIN_MTU) 30290a708f8fSGustavo F. Padovan result = L2CAP_CONF_UNACCEPT; 30300a708f8fSGustavo F. Padovan else { 30310c1bc5c6SGustavo F. Padovan chan->omtu = mtu; 3032c1360a1cSGustavo F. Padovan set_bit(CONF_MTU_DONE, &chan->conf_state); 30330a708f8fSGustavo F. Padovan } 30340c1bc5c6SGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu); 30350a708f8fSGustavo F. Padovan 303642dceae2SAndrei Emeltchenko if (remote_efs) { 303742dceae2SAndrei Emeltchenko if (chan->local_stype != L2CAP_SERV_NOTRAFIC && 303842dceae2SAndrei Emeltchenko efs.stype != L2CAP_SERV_NOTRAFIC && 303942dceae2SAndrei Emeltchenko efs.stype != chan->local_stype) { 304042dceae2SAndrei Emeltchenko 304142dceae2SAndrei Emeltchenko result = L2CAP_CONF_UNACCEPT; 304242dceae2SAndrei Emeltchenko 304342dceae2SAndrei Emeltchenko if (chan->num_conf_req >= 1) 304442dceae2SAndrei Emeltchenko return -ECONNREFUSED; 304542dceae2SAndrei Emeltchenko 304642dceae2SAndrei Emeltchenko l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, 304742dceae2SAndrei Emeltchenko sizeof(efs), 304842dceae2SAndrei Emeltchenko (unsigned long) &efs); 30490e8b207eSAndrei Emeltchenko } else { 30503e6b3b95SGustavo F. Padovan /* Send PENDING Conf Rsp */ 30510e8b207eSAndrei Emeltchenko result = L2CAP_CONF_PENDING; 30520e8b207eSAndrei Emeltchenko set_bit(CONF_LOC_CONF_PEND, &chan->conf_state); 305342dceae2SAndrei Emeltchenko } 305442dceae2SAndrei Emeltchenko } 305542dceae2SAndrei Emeltchenko 30560a708f8fSGustavo F. Padovan switch (rfc.mode) { 30570a708f8fSGustavo F. Padovan case L2CAP_MODE_BASIC: 305847d1ec61SGustavo F. Padovan chan->fcs = L2CAP_FCS_NONE; 3059c1360a1cSGustavo F. Padovan set_bit(CONF_MODE_DONE, &chan->conf_state); 30600a708f8fSGustavo F. Padovan break; 30610a708f8fSGustavo F. Padovan 30620a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 30636327eb98SAndrei Emeltchenko if (!test_bit(CONF_EWS_RECV, &chan->conf_state)) 30642c03a7a4SGustavo F. Padovan chan->remote_tx_win = rfc.txwin_size; 30656327eb98SAndrei Emeltchenko else 30666327eb98SAndrei Emeltchenko rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW; 30676327eb98SAndrei Emeltchenko 30682c03a7a4SGustavo F. Padovan chan->remote_max_tx = rfc.max_transmit; 30690a708f8fSGustavo F. Padovan 3070c8f79162SAndrei Emeltchenko size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), 3071c8f79162SAndrei Emeltchenko chan->conn->mtu - 3072c8f79162SAndrei Emeltchenko L2CAP_EXT_HDR_SIZE - 3073c8f79162SAndrei Emeltchenko L2CAP_SDULEN_SIZE - 3074c8f79162SAndrei Emeltchenko L2CAP_FCS_SIZE); 3075c8f79162SAndrei Emeltchenko rfc.max_pdu_size = cpu_to_le16(size); 3076c8f79162SAndrei Emeltchenko chan->remote_mps = size; 30770a708f8fSGustavo F. Padovan 30780a708f8fSGustavo F. Padovan rfc.retrans_timeout = 30794fd21a88SAndrei Emeltchenko __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO); 30800a708f8fSGustavo F. Padovan rfc.monitor_timeout = 30814fd21a88SAndrei Emeltchenko __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO); 30820a708f8fSGustavo F. Padovan 3083c1360a1cSGustavo F. Padovan set_bit(CONF_MODE_DONE, &chan->conf_state); 30840a708f8fSGustavo F. Padovan 30850a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, 30860a708f8fSGustavo F. Padovan sizeof(rfc), (unsigned long) &rfc); 30870a708f8fSGustavo F. Padovan 308842dceae2SAndrei Emeltchenko if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { 308942dceae2SAndrei Emeltchenko chan->remote_id = efs.id; 309042dceae2SAndrei Emeltchenko chan->remote_stype = efs.stype; 309142dceae2SAndrei Emeltchenko chan->remote_msdu = le16_to_cpu(efs.msdu); 309242dceae2SAndrei Emeltchenko chan->remote_flush_to = 309342dceae2SAndrei Emeltchenko le32_to_cpu(efs.flush_to); 309442dceae2SAndrei Emeltchenko chan->remote_acc_lat = 309542dceae2SAndrei Emeltchenko le32_to_cpu(efs.acc_lat); 309642dceae2SAndrei Emeltchenko chan->remote_sdu_itime = 309742dceae2SAndrei Emeltchenko le32_to_cpu(efs.sdu_itime); 309842dceae2SAndrei Emeltchenko l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, 309942dceae2SAndrei Emeltchenko sizeof(efs), (unsigned long) &efs); 310042dceae2SAndrei Emeltchenko } 31010a708f8fSGustavo F. Padovan break; 31020a708f8fSGustavo F. Padovan 31030a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 3104c8f79162SAndrei Emeltchenko size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), 3105c8f79162SAndrei Emeltchenko chan->conn->mtu - 3106c8f79162SAndrei Emeltchenko L2CAP_EXT_HDR_SIZE - 3107c8f79162SAndrei Emeltchenko L2CAP_SDULEN_SIZE - 3108c8f79162SAndrei Emeltchenko L2CAP_FCS_SIZE); 3109c8f79162SAndrei Emeltchenko rfc.max_pdu_size = cpu_to_le16(size); 3110c8f79162SAndrei Emeltchenko chan->remote_mps = size; 31110a708f8fSGustavo F. Padovan 3112c1360a1cSGustavo F. Padovan set_bit(CONF_MODE_DONE, &chan->conf_state); 31130a708f8fSGustavo F. Padovan 31140a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, 31150a708f8fSGustavo F. Padovan sizeof(rfc), (unsigned long) &rfc); 31160a708f8fSGustavo F. Padovan 31170a708f8fSGustavo F. Padovan break; 31180a708f8fSGustavo F. Padovan 31190a708f8fSGustavo F. Padovan default: 31200a708f8fSGustavo F. Padovan result = L2CAP_CONF_UNACCEPT; 31210a708f8fSGustavo F. Padovan 31220a708f8fSGustavo F. Padovan memset(&rfc, 0, sizeof(rfc)); 31230c1bc5c6SGustavo F. Padovan rfc.mode = chan->mode; 31240a708f8fSGustavo F. Padovan } 31250a708f8fSGustavo F. Padovan 31260a708f8fSGustavo F. Padovan if (result == L2CAP_CONF_SUCCESS) 3127c1360a1cSGustavo F. Padovan set_bit(CONF_OUTPUT_DONE, &chan->conf_state); 31280a708f8fSGustavo F. Padovan } 3129fe4128e0SGustavo F. Padovan rsp->scid = cpu_to_le16(chan->dcid); 31300a708f8fSGustavo F. Padovan rsp->result = cpu_to_le16(result); 313159e54bd1SAndrei Emeltchenko rsp->flags = __constant_cpu_to_le16(0); 31320a708f8fSGustavo F. Padovan 31330a708f8fSGustavo F. Padovan return ptr - data; 31340a708f8fSGustavo F. Padovan } 31350a708f8fSGustavo F. Padovan 3136b4450035SGustavo F. Padovan static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, void *data, u16 *result) 31370a708f8fSGustavo F. Padovan { 31380a708f8fSGustavo F. Padovan struct l2cap_conf_req *req = data; 31390a708f8fSGustavo F. Padovan void *ptr = req->data; 31400a708f8fSGustavo F. Padovan int type, olen; 31410a708f8fSGustavo F. Padovan unsigned long val; 314236e999a8SMat Martineau struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; 314366af7aafSAndrei Emeltchenko struct l2cap_conf_efs efs; 31440a708f8fSGustavo F. Padovan 3145fe4128e0SGustavo F. Padovan BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data); 31460a708f8fSGustavo F. Padovan 31470a708f8fSGustavo F. Padovan while (len >= L2CAP_CONF_OPT_SIZE) { 31480a708f8fSGustavo F. Padovan len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); 31490a708f8fSGustavo F. Padovan 31500a708f8fSGustavo F. Padovan switch (type) { 31510a708f8fSGustavo F. Padovan case L2CAP_CONF_MTU: 31520a708f8fSGustavo F. Padovan if (val < L2CAP_DEFAULT_MIN_MTU) { 31530a708f8fSGustavo F. Padovan *result = L2CAP_CONF_UNACCEPT; 31540c1bc5c6SGustavo F. Padovan chan->imtu = L2CAP_DEFAULT_MIN_MTU; 31550a708f8fSGustavo F. Padovan } else 31560c1bc5c6SGustavo F. Padovan chan->imtu = val; 31570c1bc5c6SGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); 31580a708f8fSGustavo F. Padovan break; 31590a708f8fSGustavo F. Padovan 31600a708f8fSGustavo F. Padovan case L2CAP_CONF_FLUSH_TO: 31610c1bc5c6SGustavo F. Padovan chan->flush_to = val; 31620a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, 31630c1bc5c6SGustavo F. Padovan 2, chan->flush_to); 31640a708f8fSGustavo F. Padovan break; 31650a708f8fSGustavo F. Padovan 31660a708f8fSGustavo F. Padovan case L2CAP_CONF_RFC: 31670a708f8fSGustavo F. Padovan if (olen == sizeof(rfc)) 31680a708f8fSGustavo F. Padovan memcpy(&rfc, (void *)val, olen); 31690a708f8fSGustavo F. Padovan 3170c1360a1cSGustavo F. Padovan if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) && 31710c1bc5c6SGustavo F. Padovan rfc.mode != chan->mode) 31720a708f8fSGustavo F. Padovan return -ECONNREFUSED; 31730a708f8fSGustavo F. Padovan 317447d1ec61SGustavo F. Padovan chan->fcs = 0; 31750a708f8fSGustavo F. Padovan 31760a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, 31770a708f8fSGustavo F. Padovan sizeof(rfc), (unsigned long) &rfc); 31780a708f8fSGustavo F. Padovan break; 31796327eb98SAndrei Emeltchenko 31806327eb98SAndrei Emeltchenko case L2CAP_CONF_EWS: 3181c20f8e35SMat Martineau chan->ack_win = min_t(u16, val, chan->ack_win); 31823e6b3b95SGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, 31833e6b3b95SGustavo F. Padovan chan->tx_win); 31846327eb98SAndrei Emeltchenko break; 318566af7aafSAndrei Emeltchenko 318666af7aafSAndrei Emeltchenko case L2CAP_CONF_EFS: 318766af7aafSAndrei Emeltchenko if (olen == sizeof(efs)) 318866af7aafSAndrei Emeltchenko memcpy(&efs, (void *)val, olen); 318966af7aafSAndrei Emeltchenko 319066af7aafSAndrei Emeltchenko if (chan->local_stype != L2CAP_SERV_NOTRAFIC && 319166af7aafSAndrei Emeltchenko efs.stype != L2CAP_SERV_NOTRAFIC && 319266af7aafSAndrei Emeltchenko efs.stype != chan->local_stype) 319366af7aafSAndrei Emeltchenko return -ECONNREFUSED; 319466af7aafSAndrei Emeltchenko 319566af7aafSAndrei Emeltchenko l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, 319666af7aafSAndrei Emeltchenko sizeof(efs), (unsigned long) &efs); 319766af7aafSAndrei Emeltchenko break; 31980a708f8fSGustavo F. Padovan } 31990a708f8fSGustavo F. Padovan } 32000a708f8fSGustavo F. Padovan 32010c1bc5c6SGustavo F. Padovan if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode) 32020a708f8fSGustavo F. Padovan return -ECONNREFUSED; 32030a708f8fSGustavo F. Padovan 32040c1bc5c6SGustavo F. Padovan chan->mode = rfc.mode; 32050a708f8fSGustavo F. Padovan 32060e8b207eSAndrei Emeltchenko if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) { 32070a708f8fSGustavo F. Padovan switch (rfc.mode) { 32080a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 320947d1ec61SGustavo F. Padovan chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); 321047d1ec61SGustavo F. Padovan chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); 321147d1ec61SGustavo F. Padovan chan->mps = le16_to_cpu(rfc.max_pdu_size); 3212c20f8e35SMat Martineau if (!test_bit(FLAG_EXT_CTRL, &chan->flags)) 3213c20f8e35SMat Martineau chan->ack_win = min_t(u16, chan->ack_win, 3214c20f8e35SMat Martineau rfc.txwin_size); 321566af7aafSAndrei Emeltchenko 321666af7aafSAndrei Emeltchenko if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { 321766af7aafSAndrei Emeltchenko chan->local_msdu = le16_to_cpu(efs.msdu); 321866af7aafSAndrei Emeltchenko chan->local_sdu_itime = 321966af7aafSAndrei Emeltchenko le32_to_cpu(efs.sdu_itime); 322066af7aafSAndrei Emeltchenko chan->local_acc_lat = le32_to_cpu(efs.acc_lat); 322166af7aafSAndrei Emeltchenko chan->local_flush_to = 322266af7aafSAndrei Emeltchenko le32_to_cpu(efs.flush_to); 322366af7aafSAndrei Emeltchenko } 32240a708f8fSGustavo F. Padovan break; 322566af7aafSAndrei Emeltchenko 32260a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 322747d1ec61SGustavo F. Padovan chan->mps = le16_to_cpu(rfc.max_pdu_size); 32280a708f8fSGustavo F. Padovan } 32290a708f8fSGustavo F. Padovan } 32300a708f8fSGustavo F. Padovan 3231fe4128e0SGustavo F. Padovan req->dcid = cpu_to_le16(chan->dcid); 323259e54bd1SAndrei Emeltchenko req->flags = __constant_cpu_to_le16(0); 32330a708f8fSGustavo F. Padovan 32340a708f8fSGustavo F. Padovan return ptr - data; 32350a708f8fSGustavo F. Padovan } 32360a708f8fSGustavo F. Padovan 3237fe4128e0SGustavo F. Padovan static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, u16 result, u16 flags) 32380a708f8fSGustavo F. Padovan { 32390a708f8fSGustavo F. Padovan struct l2cap_conf_rsp *rsp = data; 32400a708f8fSGustavo F. Padovan void *ptr = rsp->data; 32410a708f8fSGustavo F. Padovan 3242fe4128e0SGustavo F. Padovan BT_DBG("chan %p", chan); 32430a708f8fSGustavo F. Padovan 3244fe4128e0SGustavo F. Padovan rsp->scid = cpu_to_le16(chan->dcid); 32450a708f8fSGustavo F. Padovan rsp->result = cpu_to_le16(result); 32460a708f8fSGustavo F. Padovan rsp->flags = cpu_to_le16(flags); 32470a708f8fSGustavo F. Padovan 32480a708f8fSGustavo F. Padovan return ptr - data; 32490a708f8fSGustavo F. Padovan } 32500a708f8fSGustavo F. Padovan 32518c1d787bSGustavo F. Padovan void __l2cap_connect_rsp_defer(struct l2cap_chan *chan) 3252710f9b0aSGustavo F. Padovan { 3253710f9b0aSGustavo F. Padovan struct l2cap_conn_rsp rsp; 32548c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 3255710f9b0aSGustavo F. Padovan u8 buf[128]; 3256710f9b0aSGustavo F. Padovan 3257fe4128e0SGustavo F. Padovan rsp.scid = cpu_to_le16(chan->dcid); 3258fe4128e0SGustavo F. Padovan rsp.dcid = cpu_to_le16(chan->scid); 3259ac73498cSAndrei Emeltchenko rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS); 3260ac73498cSAndrei Emeltchenko rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); 3261710f9b0aSGustavo F. Padovan l2cap_send_cmd(conn, chan->ident, 3262710f9b0aSGustavo F. Padovan L2CAP_CONN_RSP, sizeof(rsp), &rsp); 3263710f9b0aSGustavo F. Padovan 3264c1360a1cSGustavo F. Padovan if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) 3265710f9b0aSGustavo F. Padovan return; 3266710f9b0aSGustavo F. Padovan 3267710f9b0aSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 3268710f9b0aSGustavo F. Padovan l2cap_build_conf_req(chan, buf), buf); 3269710f9b0aSGustavo F. Padovan chan->num_conf_req++; 3270710f9b0aSGustavo F. Padovan } 3271710f9b0aSGustavo F. Padovan 327247d1ec61SGustavo F. Padovan static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len) 32730a708f8fSGustavo F. Padovan { 32740a708f8fSGustavo F. Padovan int type, olen; 32750a708f8fSGustavo F. Padovan unsigned long val; 3276c20f8e35SMat Martineau /* Use sane default values in case a misbehaving remote device 3277c20f8e35SMat Martineau * did not send an RFC or extended window size option. 3278c20f8e35SMat Martineau */ 3279c20f8e35SMat Martineau u16 txwin_ext = chan->ack_win; 3280c20f8e35SMat Martineau struct l2cap_conf_rfc rfc = { 3281c20f8e35SMat Martineau .mode = chan->mode, 3282c20f8e35SMat Martineau .retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO), 3283c20f8e35SMat Martineau .monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO), 3284c20f8e35SMat Martineau .max_pdu_size = cpu_to_le16(chan->imtu), 3285c20f8e35SMat Martineau .txwin_size = min_t(u16, chan->ack_win, L2CAP_DEFAULT_TX_WINDOW), 3286c20f8e35SMat Martineau }; 32870a708f8fSGustavo F. Padovan 328847d1ec61SGustavo F. Padovan BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len); 32890a708f8fSGustavo F. Padovan 32900c1bc5c6SGustavo F. Padovan if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING)) 32910a708f8fSGustavo F. Padovan return; 32920a708f8fSGustavo F. Padovan 32930a708f8fSGustavo F. Padovan while (len >= L2CAP_CONF_OPT_SIZE) { 32940a708f8fSGustavo F. Padovan len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); 32950a708f8fSGustavo F. Padovan 3296c20f8e35SMat Martineau switch (type) { 3297c20f8e35SMat Martineau case L2CAP_CONF_RFC: 3298c20f8e35SMat Martineau if (olen == sizeof(rfc)) 32990a708f8fSGustavo F. Padovan memcpy(&rfc, (void *)val, olen); 3300c20f8e35SMat Martineau break; 3301c20f8e35SMat Martineau case L2CAP_CONF_EWS: 3302c20f8e35SMat Martineau txwin_ext = val; 3303c20f8e35SMat Martineau break; 3304c20f8e35SMat Martineau } 33050a708f8fSGustavo F. Padovan } 33060a708f8fSGustavo F. Padovan 33070a708f8fSGustavo F. Padovan switch (rfc.mode) { 33080a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 330947d1ec61SGustavo F. Padovan chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); 331047d1ec61SGustavo F. Padovan chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); 331147d1ec61SGustavo F. Padovan chan->mps = le16_to_cpu(rfc.max_pdu_size); 3312c20f8e35SMat Martineau if (test_bit(FLAG_EXT_CTRL, &chan->flags)) 3313c20f8e35SMat Martineau chan->ack_win = min_t(u16, chan->ack_win, txwin_ext); 3314c20f8e35SMat Martineau else 3315c20f8e35SMat Martineau chan->ack_win = min_t(u16, chan->ack_win, 3316c20f8e35SMat Martineau rfc.txwin_size); 33170a708f8fSGustavo F. Padovan break; 33180a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 331947d1ec61SGustavo F. Padovan chan->mps = le16_to_cpu(rfc.max_pdu_size); 33200a708f8fSGustavo F. Padovan } 33210a708f8fSGustavo F. Padovan } 33220a708f8fSGustavo F. Padovan 33230a708f8fSGustavo F. Padovan static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) 33240a708f8fSGustavo F. Padovan { 3325e2fd318eSIlia Kolomisnky struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data; 33260a708f8fSGustavo F. Padovan 3327e2fd318eSIlia Kolomisnky if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD) 33280a708f8fSGustavo F. Padovan return 0; 33290a708f8fSGustavo F. Padovan 33300a708f8fSGustavo F. Padovan if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && 33310a708f8fSGustavo F. Padovan cmd->ident == conn->info_ident) { 333217cd3f37SUlisses Furquim cancel_delayed_work(&conn->info_timer); 33330a708f8fSGustavo F. Padovan 33340a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 33350a708f8fSGustavo F. Padovan conn->info_ident = 0; 33360a708f8fSGustavo F. Padovan 33370a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 33380a708f8fSGustavo F. Padovan } 33390a708f8fSGustavo F. Padovan 33400a708f8fSGustavo F. Padovan return 0; 33410a708f8fSGustavo F. Padovan } 33420a708f8fSGustavo F. Padovan 33430a708f8fSGustavo F. Padovan static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) 33440a708f8fSGustavo F. Padovan { 33450a708f8fSGustavo F. Padovan struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; 33460a708f8fSGustavo F. Padovan struct l2cap_conn_rsp rsp; 334723691d75SGustavo F. Padovan struct l2cap_chan *chan = NULL, *pchan; 33480a708f8fSGustavo F. Padovan struct sock *parent, *sk = NULL; 33490a708f8fSGustavo F. Padovan int result, status = L2CAP_CS_NO_INFO; 33500a708f8fSGustavo F. Padovan 33510a708f8fSGustavo F. Padovan u16 dcid = 0, scid = __le16_to_cpu(req->scid); 33520a708f8fSGustavo F. Padovan __le16 psm = req->psm; 33530a708f8fSGustavo F. Padovan 3354097db76cSAndrei Emeltchenko BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid); 33550a708f8fSGustavo F. Padovan 33560a708f8fSGustavo F. Padovan /* Check if we have socket listening on psm */ 3357c2287681SIdo Yariv pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src, conn->dst); 335823691d75SGustavo F. Padovan if (!pchan) { 33590a708f8fSGustavo F. Padovan result = L2CAP_CR_BAD_PSM; 33600a708f8fSGustavo F. Padovan goto sendresp; 33610a708f8fSGustavo F. Padovan } 33620a708f8fSGustavo F. Padovan 336323691d75SGustavo F. Padovan parent = pchan->sk; 336423691d75SGustavo F. Padovan 33653df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 3366aa2ac881SGustavo F. Padovan lock_sock(parent); 33670a708f8fSGustavo F. Padovan 33680a708f8fSGustavo F. Padovan /* Check if the ACL is secure enough (if not SDP) */ 33692983fd68SAndrei Emeltchenko if (psm != __constant_cpu_to_le16(L2CAP_PSM_SDP) && 33700a708f8fSGustavo F. Padovan !hci_conn_check_link_mode(conn->hcon)) { 33719f5a0d7bSAndrei Emeltchenko conn->disc_reason = HCI_ERROR_AUTH_FAILURE; 33720a708f8fSGustavo F. Padovan result = L2CAP_CR_SEC_BLOCK; 33730a708f8fSGustavo F. Padovan goto response; 33740a708f8fSGustavo F. Padovan } 33750a708f8fSGustavo F. Padovan 33760a708f8fSGustavo F. Padovan result = L2CAP_CR_NO_MEM; 33770a708f8fSGustavo F. Padovan 33782dfa1003SGustavo Padovan /* Check if we already have channel with that dcid */ 33792dfa1003SGustavo Padovan if (__l2cap_get_chan_by_dcid(conn, scid)) 33802dfa1003SGustavo Padovan goto response; 33812dfa1003SGustavo Padovan 338280b98027SGustavo Padovan chan = pchan->ops->new_connection(pchan); 338380808e43SGustavo F. Padovan if (!chan) 33840a708f8fSGustavo F. Padovan goto response; 33850a708f8fSGustavo F. Padovan 338680808e43SGustavo F. Padovan sk = chan->sk; 338780808e43SGustavo F. Padovan 33880a708f8fSGustavo F. Padovan hci_conn_hold(conn->hcon); 33890a708f8fSGustavo F. Padovan 33900a708f8fSGustavo F. Padovan bacpy(&bt_sk(sk)->src, conn->src); 33910a708f8fSGustavo F. Padovan bacpy(&bt_sk(sk)->dst, conn->dst); 3392fe4128e0SGustavo F. Padovan chan->psm = psm; 3393fe4128e0SGustavo F. Padovan chan->dcid = scid; 33940a708f8fSGustavo F. Padovan 3395d1010240SGustavo F. Padovan bt_accept_enqueue(parent, sk); 3396d1010240SGustavo F. Padovan 33976be36555SAndrei Emeltchenko __l2cap_chan_add(conn, chan); 339848454079SGustavo F. Padovan 3399fe4128e0SGustavo F. Padovan dcid = chan->scid; 34000a708f8fSGustavo F. Padovan 3401c9b66675SGustavo F. Padovan __set_chan_timer(chan, sk->sk_sndtimeo); 34020a708f8fSGustavo F. Padovan 3403fc7f8a7eSGustavo F. Padovan chan->ident = cmd->ident; 34040a708f8fSGustavo F. Padovan 34050a708f8fSGustavo F. Padovan if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { 3406d45fc423SGustavo F. Padovan if (l2cap_chan_check_security(chan)) { 3407c5daa683SGustavo Padovan if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) { 34080e587be7SAndrei Emeltchenko __l2cap_state_change(chan, BT_CONNECT2); 34090a708f8fSGustavo F. Padovan result = L2CAP_CR_PEND; 34100a708f8fSGustavo F. Padovan status = L2CAP_CS_AUTHOR_PEND; 34110a708f8fSGustavo F. Padovan parent->sk_data_ready(parent, 0); 34120a708f8fSGustavo F. Padovan } else { 34130e587be7SAndrei Emeltchenko __l2cap_state_change(chan, BT_CONFIG); 34140a708f8fSGustavo F. Padovan result = L2CAP_CR_SUCCESS; 34150a708f8fSGustavo F. Padovan status = L2CAP_CS_NO_INFO; 34160a708f8fSGustavo F. Padovan } 34170a708f8fSGustavo F. Padovan } else { 34180e587be7SAndrei Emeltchenko __l2cap_state_change(chan, BT_CONNECT2); 34190a708f8fSGustavo F. Padovan result = L2CAP_CR_PEND; 34200a708f8fSGustavo F. Padovan status = L2CAP_CS_AUTHEN_PEND; 34210a708f8fSGustavo F. Padovan } 34220a708f8fSGustavo F. Padovan } else { 34230e587be7SAndrei Emeltchenko __l2cap_state_change(chan, BT_CONNECT2); 34240a708f8fSGustavo F. Padovan result = L2CAP_CR_PEND; 34250a708f8fSGustavo F. Padovan status = L2CAP_CS_NO_INFO; 34260a708f8fSGustavo F. Padovan } 34270a708f8fSGustavo F. Padovan 34280a708f8fSGustavo F. Padovan response: 3429aa2ac881SGustavo F. Padovan release_sock(parent); 34303df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 34310a708f8fSGustavo F. Padovan 34320a708f8fSGustavo F. Padovan sendresp: 34330a708f8fSGustavo F. Padovan rsp.scid = cpu_to_le16(scid); 34340a708f8fSGustavo F. Padovan rsp.dcid = cpu_to_le16(dcid); 34350a708f8fSGustavo F. Padovan rsp.result = cpu_to_le16(result); 34360a708f8fSGustavo F. Padovan rsp.status = cpu_to_le16(status); 34370a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); 34380a708f8fSGustavo F. Padovan 34390a708f8fSGustavo F. Padovan if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { 34400a708f8fSGustavo F. Padovan struct l2cap_info_req info; 3441ac73498cSAndrei Emeltchenko info.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); 34420a708f8fSGustavo F. Padovan 34430a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; 34440a708f8fSGustavo F. Padovan conn->info_ident = l2cap_get_ident(conn); 34450a708f8fSGustavo F. Padovan 3446ba13ccd9SMarcel Holtmann schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); 34470a708f8fSGustavo F. Padovan 34480a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, conn->info_ident, 34490a708f8fSGustavo F. Padovan L2CAP_INFO_REQ, sizeof(info), &info); 34500a708f8fSGustavo F. Padovan } 34510a708f8fSGustavo F. Padovan 3452c1360a1cSGustavo F. Padovan if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) && 34530a708f8fSGustavo F. Padovan result == L2CAP_CR_SUCCESS) { 34540a708f8fSGustavo F. Padovan u8 buf[128]; 3455c1360a1cSGustavo F. Padovan set_bit(CONF_REQ_SENT, &chan->conf_state); 34560a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 345773ffa904SGustavo F. Padovan l2cap_build_conf_req(chan, buf), buf); 345873ffa904SGustavo F. Padovan chan->num_conf_req++; 34590a708f8fSGustavo F. Padovan } 34600a708f8fSGustavo F. Padovan 34610a708f8fSGustavo F. Padovan return 0; 34620a708f8fSGustavo F. Padovan } 34630a708f8fSGustavo F. Padovan 34640a708f8fSGustavo F. Padovan static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) 34650a708f8fSGustavo F. Padovan { 34660a708f8fSGustavo F. Padovan struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; 34670a708f8fSGustavo F. Padovan u16 scid, dcid, result, status; 346848454079SGustavo F. Padovan struct l2cap_chan *chan; 34690a708f8fSGustavo F. Padovan u8 req[128]; 34703df91ea2SAndrei Emeltchenko int err; 34710a708f8fSGustavo F. Padovan 34720a708f8fSGustavo F. Padovan scid = __le16_to_cpu(rsp->scid); 34730a708f8fSGustavo F. Padovan dcid = __le16_to_cpu(rsp->dcid); 34740a708f8fSGustavo F. Padovan result = __le16_to_cpu(rsp->result); 34750a708f8fSGustavo F. Padovan status = __le16_to_cpu(rsp->status); 34760a708f8fSGustavo F. Padovan 34771b009c98SAndrei Emeltchenko BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", 34781b009c98SAndrei Emeltchenko dcid, scid, result, status); 34790a708f8fSGustavo F. Padovan 34803df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 34813df91ea2SAndrei Emeltchenko 34820a708f8fSGustavo F. Padovan if (scid) { 34833df91ea2SAndrei Emeltchenko chan = __l2cap_get_chan_by_scid(conn, scid); 34843df91ea2SAndrei Emeltchenko if (!chan) { 34853df91ea2SAndrei Emeltchenko err = -EFAULT; 34863df91ea2SAndrei Emeltchenko goto unlock; 34873df91ea2SAndrei Emeltchenko } 34880a708f8fSGustavo F. Padovan } else { 34893df91ea2SAndrei Emeltchenko chan = __l2cap_get_chan_by_ident(conn, cmd->ident); 34903df91ea2SAndrei Emeltchenko if (!chan) { 34913df91ea2SAndrei Emeltchenko err = -EFAULT; 34923df91ea2SAndrei Emeltchenko goto unlock; 34933df91ea2SAndrei Emeltchenko } 34940a708f8fSGustavo F. Padovan } 34950a708f8fSGustavo F. Padovan 34963df91ea2SAndrei Emeltchenko err = 0; 34973df91ea2SAndrei Emeltchenko 34986be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 349948454079SGustavo F. Padovan 35000a708f8fSGustavo F. Padovan switch (result) { 35010a708f8fSGustavo F. Padovan case L2CAP_CR_SUCCESS: 350289bc500eSGustavo F. Padovan l2cap_state_change(chan, BT_CONFIG); 3503fc7f8a7eSGustavo F. Padovan chan->ident = 0; 3504fe4128e0SGustavo F. Padovan chan->dcid = dcid; 3505c1360a1cSGustavo F. Padovan clear_bit(CONF_CONNECT_PEND, &chan->conf_state); 35060a708f8fSGustavo F. Padovan 3507c1360a1cSGustavo F. Padovan if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) 35080a708f8fSGustavo F. Padovan break; 35090a708f8fSGustavo F. Padovan 35100a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 351173ffa904SGustavo F. Padovan l2cap_build_conf_req(chan, req), req); 351273ffa904SGustavo F. Padovan chan->num_conf_req++; 35130a708f8fSGustavo F. Padovan break; 35140a708f8fSGustavo F. Padovan 35150a708f8fSGustavo F. Padovan case L2CAP_CR_PEND: 3516c1360a1cSGustavo F. Padovan set_bit(CONF_CONNECT_PEND, &chan->conf_state); 35170a708f8fSGustavo F. Padovan break; 35180a708f8fSGustavo F. Padovan 35190a708f8fSGustavo F. Padovan default: 352048454079SGustavo F. Padovan l2cap_chan_del(chan, ECONNREFUSED); 35210a708f8fSGustavo F. Padovan break; 35220a708f8fSGustavo F. Padovan } 35230a708f8fSGustavo F. Padovan 35246be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 35253df91ea2SAndrei Emeltchenko 35263df91ea2SAndrei Emeltchenko unlock: 35273df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 35283df91ea2SAndrei Emeltchenko 35293df91ea2SAndrei Emeltchenko return err; 35300a708f8fSGustavo F. Padovan } 35310a708f8fSGustavo F. Padovan 353247d1ec61SGustavo F. Padovan static inline void set_default_fcs(struct l2cap_chan *chan) 35330a708f8fSGustavo F. Padovan { 35340a708f8fSGustavo F. Padovan /* FCS is enabled only in ERTM or streaming mode, if one or both 35350a708f8fSGustavo F. Padovan * sides request it. 35360a708f8fSGustavo F. Padovan */ 35370c1bc5c6SGustavo F. Padovan if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING) 353847d1ec61SGustavo F. Padovan chan->fcs = L2CAP_FCS_NONE; 3539c1360a1cSGustavo F. Padovan else if (!test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) 354047d1ec61SGustavo F. Padovan chan->fcs = L2CAP_FCS_CRC16; 35410a708f8fSGustavo F. Padovan } 35420a708f8fSGustavo F. Padovan 35430a708f8fSGustavo F. Padovan static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) 35440a708f8fSGustavo F. Padovan { 35450a708f8fSGustavo F. Padovan struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; 35460a708f8fSGustavo F. Padovan u16 dcid, flags; 35470a708f8fSGustavo F. Padovan u8 rsp[64]; 354848454079SGustavo F. Padovan struct l2cap_chan *chan; 35493c588192SMat Martineau int len, err = 0; 35500a708f8fSGustavo F. Padovan 35510a708f8fSGustavo F. Padovan dcid = __le16_to_cpu(req->dcid); 35520a708f8fSGustavo F. Padovan flags = __le16_to_cpu(req->flags); 35530a708f8fSGustavo F. Padovan 35540a708f8fSGustavo F. Padovan BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); 35550a708f8fSGustavo F. Padovan 3556baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, dcid); 355748454079SGustavo F. Padovan if (!chan) 35580a708f8fSGustavo F. Padovan return -ENOENT; 35590a708f8fSGustavo F. Padovan 3560033b1142SDavid S. Miller if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) { 3561e2fd318eSIlia Kolomisnky struct l2cap_cmd_rej_cid rej; 35620a708f8fSGustavo F. Padovan 3563ac73498cSAndrei Emeltchenko rej.reason = __constant_cpu_to_le16(L2CAP_REJ_INVALID_CID); 3564e2fd318eSIlia Kolomisnky rej.scid = cpu_to_le16(chan->scid); 3565e2fd318eSIlia Kolomisnky rej.dcid = cpu_to_le16(chan->dcid); 3566e2fd318eSIlia Kolomisnky 35670a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, 35680a708f8fSGustavo F. Padovan sizeof(rej), &rej); 35690a708f8fSGustavo F. Padovan goto unlock; 35700a708f8fSGustavo F. Padovan } 35710a708f8fSGustavo F. Padovan 35720a708f8fSGustavo F. Padovan /* Reject if config buffer is too small. */ 35730a708f8fSGustavo F. Padovan len = cmd_len - sizeof(*req); 35747ac28817SDan Rosenberg if (len < 0 || chan->conf_len + len > sizeof(chan->conf_req)) { 35750a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, 3576fe4128e0SGustavo F. Padovan l2cap_build_conf_rsp(chan, rsp, 35770a708f8fSGustavo F. Padovan L2CAP_CONF_REJECT, flags), rsp); 35780a708f8fSGustavo F. Padovan goto unlock; 35790a708f8fSGustavo F. Padovan } 35800a708f8fSGustavo F. Padovan 35810a708f8fSGustavo F. Padovan /* Store config. */ 358273ffa904SGustavo F. Padovan memcpy(chan->conf_req + chan->conf_len, req->data, len); 358373ffa904SGustavo F. Padovan chan->conf_len += len; 35840a708f8fSGustavo F. Padovan 358559e54bd1SAndrei Emeltchenko if (flags & L2CAP_CONF_FLAG_CONTINUATION) { 35860a708f8fSGustavo F. Padovan /* Incomplete config. Send empty response. */ 35870a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, 3588fe4128e0SGustavo F. Padovan l2cap_build_conf_rsp(chan, rsp, 35895325e5bbSAndrei Emeltchenko L2CAP_CONF_SUCCESS, flags), rsp); 35900a708f8fSGustavo F. Padovan goto unlock; 35910a708f8fSGustavo F. Padovan } 35920a708f8fSGustavo F. Padovan 35930a708f8fSGustavo F. Padovan /* Complete config. */ 359473ffa904SGustavo F. Padovan len = l2cap_parse_conf_req(chan, rsp); 35950a708f8fSGustavo F. Padovan if (len < 0) { 3596e92c8e70SGustavo F. Padovan l2cap_send_disconn_req(conn, chan, ECONNRESET); 35970a708f8fSGustavo F. Padovan goto unlock; 35980a708f8fSGustavo F. Padovan } 35990a708f8fSGustavo F. Padovan 36000a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); 360173ffa904SGustavo F. Padovan chan->num_conf_rsp++; 36020a708f8fSGustavo F. Padovan 36030a708f8fSGustavo F. Padovan /* Reset config buffer. */ 360473ffa904SGustavo F. Padovan chan->conf_len = 0; 36050a708f8fSGustavo F. Padovan 3606c1360a1cSGustavo F. Padovan if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) 36070a708f8fSGustavo F. Padovan goto unlock; 36080a708f8fSGustavo F. Padovan 3609c1360a1cSGustavo F. Padovan if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { 361047d1ec61SGustavo F. Padovan set_default_fcs(chan); 36110a708f8fSGustavo F. Padovan 3612105bdf9eSMat Martineau if (chan->mode == L2CAP_MODE_ERTM || 3613105bdf9eSMat Martineau chan->mode == L2CAP_MODE_STREAMING) 36143c588192SMat Martineau err = l2cap_ertm_init(chan); 36150a708f8fSGustavo F. Padovan 36163c588192SMat Martineau if (err < 0) 36173c588192SMat Martineau l2cap_send_disconn_req(chan->conn, chan, -err); 36183c588192SMat Martineau else 3619cf4cd009SAndrei Emeltchenko l2cap_chan_ready(chan); 36203c588192SMat Martineau 36210a708f8fSGustavo F. Padovan goto unlock; 36220a708f8fSGustavo F. Padovan } 36230a708f8fSGustavo F. Padovan 3624c1360a1cSGustavo F. Padovan if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) { 36250a708f8fSGustavo F. Padovan u8 buf[64]; 36260a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 362773ffa904SGustavo F. Padovan l2cap_build_conf_req(chan, buf), buf); 362873ffa904SGustavo F. Padovan chan->num_conf_req++; 36290a708f8fSGustavo F. Padovan } 36300a708f8fSGustavo F. Padovan 36310e8b207eSAndrei Emeltchenko /* Got Conf Rsp PENDING from remote side and asume we sent 36320e8b207eSAndrei Emeltchenko Conf Rsp PENDING in the code above */ 36330e8b207eSAndrei Emeltchenko if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) && 36340e8b207eSAndrei Emeltchenko test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { 36350e8b207eSAndrei Emeltchenko 36360e8b207eSAndrei Emeltchenko /* check compatibility */ 36370e8b207eSAndrei Emeltchenko 36380e8b207eSAndrei Emeltchenko clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); 36390e8b207eSAndrei Emeltchenko set_bit(CONF_OUTPUT_DONE, &chan->conf_state); 36400e8b207eSAndrei Emeltchenko 36410e8b207eSAndrei Emeltchenko l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, 36420e8b207eSAndrei Emeltchenko l2cap_build_conf_rsp(chan, rsp, 36435325e5bbSAndrei Emeltchenko L2CAP_CONF_SUCCESS, flags), rsp); 36440e8b207eSAndrei Emeltchenko } 36450e8b207eSAndrei Emeltchenko 36460a708f8fSGustavo F. Padovan unlock: 36476be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 36483c588192SMat Martineau return err; 36490a708f8fSGustavo F. Padovan } 36500a708f8fSGustavo F. Padovan 36510a708f8fSGustavo F. Padovan static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) 36520a708f8fSGustavo F. Padovan { 36530a708f8fSGustavo F. Padovan struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; 36540a708f8fSGustavo F. Padovan u16 scid, flags, result; 365548454079SGustavo F. Padovan struct l2cap_chan *chan; 365661386cbaSAndrei Emeltchenko int len = le16_to_cpu(cmd->len) - sizeof(*rsp); 36573c588192SMat Martineau int err = 0; 36580a708f8fSGustavo F. Padovan 36590a708f8fSGustavo F. Padovan scid = __le16_to_cpu(rsp->scid); 36600a708f8fSGustavo F. Padovan flags = __le16_to_cpu(rsp->flags); 36610a708f8fSGustavo F. Padovan result = __le16_to_cpu(rsp->result); 36620a708f8fSGustavo F. Padovan 366361386cbaSAndrei Emeltchenko BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags, 366461386cbaSAndrei Emeltchenko result, len); 36650a708f8fSGustavo F. Padovan 3666baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, scid); 366748454079SGustavo F. Padovan if (!chan) 36680a708f8fSGustavo F. Padovan return 0; 36690a708f8fSGustavo F. Padovan 36700a708f8fSGustavo F. Padovan switch (result) { 36710a708f8fSGustavo F. Padovan case L2CAP_CONF_SUCCESS: 367247d1ec61SGustavo F. Padovan l2cap_conf_rfc_get(chan, rsp->data, len); 36730e8b207eSAndrei Emeltchenko clear_bit(CONF_REM_CONF_PEND, &chan->conf_state); 36740a708f8fSGustavo F. Padovan break; 36750a708f8fSGustavo F. Padovan 36760e8b207eSAndrei Emeltchenko case L2CAP_CONF_PENDING: 36770e8b207eSAndrei Emeltchenko set_bit(CONF_REM_CONF_PEND, &chan->conf_state); 36780e8b207eSAndrei Emeltchenko 36790e8b207eSAndrei Emeltchenko if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { 36800e8b207eSAndrei Emeltchenko char buf[64]; 36810e8b207eSAndrei Emeltchenko 36820e8b207eSAndrei Emeltchenko len = l2cap_parse_conf_rsp(chan, rsp->data, len, 36830e8b207eSAndrei Emeltchenko buf, &result); 36840e8b207eSAndrei Emeltchenko if (len < 0) { 36850e8b207eSAndrei Emeltchenko l2cap_send_disconn_req(conn, chan, ECONNRESET); 36860e8b207eSAndrei Emeltchenko goto done; 36870e8b207eSAndrei Emeltchenko } 36880e8b207eSAndrei Emeltchenko 36890e8b207eSAndrei Emeltchenko /* check compatibility */ 36900e8b207eSAndrei Emeltchenko 36910e8b207eSAndrei Emeltchenko clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); 36920e8b207eSAndrei Emeltchenko set_bit(CONF_OUTPUT_DONE, &chan->conf_state); 36930e8b207eSAndrei Emeltchenko 36940e8b207eSAndrei Emeltchenko l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, 36950e8b207eSAndrei Emeltchenko l2cap_build_conf_rsp(chan, buf, 36960e8b207eSAndrei Emeltchenko L2CAP_CONF_SUCCESS, 0x0000), buf); 36970e8b207eSAndrei Emeltchenko } 36980e8b207eSAndrei Emeltchenko goto done; 36990e8b207eSAndrei Emeltchenko 37000a708f8fSGustavo F. Padovan case L2CAP_CONF_UNACCEPT: 370173ffa904SGustavo F. Padovan if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { 37020a708f8fSGustavo F. Padovan char req[64]; 37030a708f8fSGustavo F. Padovan 37040a708f8fSGustavo F. Padovan if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { 3705e92c8e70SGustavo F. Padovan l2cap_send_disconn_req(conn, chan, ECONNRESET); 37060a708f8fSGustavo F. Padovan goto done; 37070a708f8fSGustavo F. Padovan } 37080a708f8fSGustavo F. Padovan 37090a708f8fSGustavo F. Padovan /* throw out any old stored conf requests */ 37100a708f8fSGustavo F. Padovan result = L2CAP_CONF_SUCCESS; 3711b4450035SGustavo F. Padovan len = l2cap_parse_conf_rsp(chan, rsp->data, len, 3712b4450035SGustavo F. Padovan req, &result); 37130a708f8fSGustavo F. Padovan if (len < 0) { 3714e92c8e70SGustavo F. Padovan l2cap_send_disconn_req(conn, chan, ECONNRESET); 37150a708f8fSGustavo F. Padovan goto done; 37160a708f8fSGustavo F. Padovan } 37170a708f8fSGustavo F. Padovan 37180a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), 37190a708f8fSGustavo F. Padovan L2CAP_CONF_REQ, len, req); 372073ffa904SGustavo F. Padovan chan->num_conf_req++; 37210a708f8fSGustavo F. Padovan if (result != L2CAP_CONF_SUCCESS) 37220a708f8fSGustavo F. Padovan goto done; 37230a708f8fSGustavo F. Padovan break; 37240a708f8fSGustavo F. Padovan } 37250a708f8fSGustavo F. Padovan 37260a708f8fSGustavo F. Padovan default: 37276be36555SAndrei Emeltchenko l2cap_chan_set_err(chan, ECONNRESET); 37282e0052e4SAndrei Emeltchenko 3729ba13ccd9SMarcel Holtmann __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT); 3730e92c8e70SGustavo F. Padovan l2cap_send_disconn_req(conn, chan, ECONNRESET); 37310a708f8fSGustavo F. Padovan goto done; 37320a708f8fSGustavo F. Padovan } 37330a708f8fSGustavo F. Padovan 373459e54bd1SAndrei Emeltchenko if (flags & L2CAP_CONF_FLAG_CONTINUATION) 37350a708f8fSGustavo F. Padovan goto done; 37360a708f8fSGustavo F. Padovan 3737c1360a1cSGustavo F. Padovan set_bit(CONF_INPUT_DONE, &chan->conf_state); 37380a708f8fSGustavo F. Padovan 3739c1360a1cSGustavo F. Padovan if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) { 374047d1ec61SGustavo F. Padovan set_default_fcs(chan); 37410a708f8fSGustavo F. Padovan 3742105bdf9eSMat Martineau if (chan->mode == L2CAP_MODE_ERTM || 3743105bdf9eSMat Martineau chan->mode == L2CAP_MODE_STREAMING) 37443c588192SMat Martineau err = l2cap_ertm_init(chan); 37450a708f8fSGustavo F. Padovan 37463c588192SMat Martineau if (err < 0) 37473c588192SMat Martineau l2cap_send_disconn_req(chan->conn, chan, -err); 37483c588192SMat Martineau else 3749cf4cd009SAndrei Emeltchenko l2cap_chan_ready(chan); 37500a708f8fSGustavo F. Padovan } 37510a708f8fSGustavo F. Padovan 37520a708f8fSGustavo F. Padovan done: 37536be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 37543c588192SMat Martineau return err; 37550a708f8fSGustavo F. Padovan } 37560a708f8fSGustavo F. Padovan 37570a708f8fSGustavo F. Padovan static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) 37580a708f8fSGustavo F. Padovan { 37590a708f8fSGustavo F. Padovan struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; 37600a708f8fSGustavo F. Padovan struct l2cap_disconn_rsp rsp; 37610a708f8fSGustavo F. Padovan u16 dcid, scid; 376248454079SGustavo F. Padovan struct l2cap_chan *chan; 37630a708f8fSGustavo F. Padovan struct sock *sk; 37640a708f8fSGustavo F. Padovan 37650a708f8fSGustavo F. Padovan scid = __le16_to_cpu(req->scid); 37660a708f8fSGustavo F. Padovan dcid = __le16_to_cpu(req->dcid); 37670a708f8fSGustavo F. Padovan 37680a708f8fSGustavo F. Padovan BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); 37690a708f8fSGustavo F. Padovan 37703df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 37713df91ea2SAndrei Emeltchenko 37723df91ea2SAndrei Emeltchenko chan = __l2cap_get_chan_by_scid(conn, dcid); 37733df91ea2SAndrei Emeltchenko if (!chan) { 37743df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 37750a708f8fSGustavo F. Padovan return 0; 37763df91ea2SAndrei Emeltchenko } 37770a708f8fSGustavo F. Padovan 37786be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 37796be36555SAndrei Emeltchenko 378048454079SGustavo F. Padovan sk = chan->sk; 378148454079SGustavo F. Padovan 3782fe4128e0SGustavo F. Padovan rsp.dcid = cpu_to_le16(chan->scid); 3783fe4128e0SGustavo F. Padovan rsp.scid = cpu_to_le16(chan->dcid); 37840a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); 37850a708f8fSGustavo F. Padovan 37866be36555SAndrei Emeltchenko lock_sock(sk); 37870a708f8fSGustavo F. Padovan sk->sk_shutdown = SHUTDOWN_MASK; 37886be36555SAndrei Emeltchenko release_sock(sk); 37890a708f8fSGustavo F. Padovan 379061d6ef3eSMat Martineau l2cap_chan_hold(chan); 379148454079SGustavo F. Padovan l2cap_chan_del(chan, ECONNRESET); 37926be36555SAndrei Emeltchenko 37936be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 37940a708f8fSGustavo F. Padovan 379580b98027SGustavo Padovan chan->ops->close(chan); 379661d6ef3eSMat Martineau l2cap_chan_put(chan); 37973df91ea2SAndrei Emeltchenko 37983df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 37993df91ea2SAndrei Emeltchenko 38000a708f8fSGustavo F. Padovan return 0; 38010a708f8fSGustavo F. Padovan } 38020a708f8fSGustavo F. Padovan 38030a708f8fSGustavo F. Padovan static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) 38040a708f8fSGustavo F. Padovan { 38050a708f8fSGustavo F. Padovan struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; 38060a708f8fSGustavo F. Padovan u16 dcid, scid; 380748454079SGustavo F. Padovan struct l2cap_chan *chan; 38080a708f8fSGustavo F. Padovan 38090a708f8fSGustavo F. Padovan scid = __le16_to_cpu(rsp->scid); 38100a708f8fSGustavo F. Padovan dcid = __le16_to_cpu(rsp->dcid); 38110a708f8fSGustavo F. Padovan 38120a708f8fSGustavo F. Padovan BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); 38130a708f8fSGustavo F. Padovan 38143df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 38153df91ea2SAndrei Emeltchenko 38163df91ea2SAndrei Emeltchenko chan = __l2cap_get_chan_by_scid(conn, scid); 38173df91ea2SAndrei Emeltchenko if (!chan) { 38183df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 38190a708f8fSGustavo F. Padovan return 0; 38203df91ea2SAndrei Emeltchenko } 38210a708f8fSGustavo F. Padovan 38226be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 382348454079SGustavo F. Padovan 382461d6ef3eSMat Martineau l2cap_chan_hold(chan); 382548454079SGustavo F. Padovan l2cap_chan_del(chan, 0); 38266be36555SAndrei Emeltchenko 38276be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 38280a708f8fSGustavo F. Padovan 382980b98027SGustavo Padovan chan->ops->close(chan); 383061d6ef3eSMat Martineau l2cap_chan_put(chan); 38313df91ea2SAndrei Emeltchenko 38323df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 38333df91ea2SAndrei Emeltchenko 38340a708f8fSGustavo F. Padovan return 0; 38350a708f8fSGustavo F. Padovan } 38360a708f8fSGustavo F. Padovan 38370a708f8fSGustavo F. Padovan static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) 38380a708f8fSGustavo F. Padovan { 38390a708f8fSGustavo F. Padovan struct l2cap_info_req *req = (struct l2cap_info_req *) data; 38400a708f8fSGustavo F. Padovan u16 type; 38410a708f8fSGustavo F. Padovan 38420a708f8fSGustavo F. Padovan type = __le16_to_cpu(req->type); 38430a708f8fSGustavo F. Padovan 38440a708f8fSGustavo F. Padovan BT_DBG("type 0x%4.4x", type); 38450a708f8fSGustavo F. Padovan 38460a708f8fSGustavo F. Padovan if (type == L2CAP_IT_FEAT_MASK) { 38470a708f8fSGustavo F. Padovan u8 buf[8]; 38480a708f8fSGustavo F. Padovan u32 feat_mask = l2cap_feat_mask; 38490a708f8fSGustavo F. Padovan struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; 3850ac73498cSAndrei Emeltchenko rsp->type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); 3851ac73498cSAndrei Emeltchenko rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS); 38520a708f8fSGustavo F. Padovan if (!disable_ertm) 38530a708f8fSGustavo F. Padovan feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING 38540a708f8fSGustavo F. Padovan | L2CAP_FEAT_FCS; 3855a5fd6f30SAndrei Emeltchenko if (enable_hs) 38566327eb98SAndrei Emeltchenko feat_mask |= L2CAP_FEAT_EXT_FLOW 38576327eb98SAndrei Emeltchenko | L2CAP_FEAT_EXT_WINDOW; 3858a5fd6f30SAndrei Emeltchenko 38590a708f8fSGustavo F. Padovan put_unaligned_le32(feat_mask, rsp->data); 38600a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, 38610a708f8fSGustavo F. Padovan L2CAP_INFO_RSP, sizeof(buf), buf); 38620a708f8fSGustavo F. Padovan } else if (type == L2CAP_IT_FIXED_CHAN) { 38630a708f8fSGustavo F. Padovan u8 buf[12]; 38640a708f8fSGustavo F. Padovan struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; 386550a147cdSMat Martineau 386650a147cdSMat Martineau if (enable_hs) 386750a147cdSMat Martineau l2cap_fixed_chan[0] |= L2CAP_FC_A2MP; 386850a147cdSMat Martineau else 386950a147cdSMat Martineau l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP; 387050a147cdSMat Martineau 3871ac73498cSAndrei Emeltchenko rsp->type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN); 3872ac73498cSAndrei Emeltchenko rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS); 3873c6337ea6SAndrei Emeltchenko memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan)); 38740a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, 38750a708f8fSGustavo F. Padovan L2CAP_INFO_RSP, sizeof(buf), buf); 38760a708f8fSGustavo F. Padovan } else { 38770a708f8fSGustavo F. Padovan struct l2cap_info_rsp rsp; 38780a708f8fSGustavo F. Padovan rsp.type = cpu_to_le16(type); 3879ac73498cSAndrei Emeltchenko rsp.result = __constant_cpu_to_le16(L2CAP_IR_NOTSUPP); 38800a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, 38810a708f8fSGustavo F. Padovan L2CAP_INFO_RSP, sizeof(rsp), &rsp); 38820a708f8fSGustavo F. Padovan } 38830a708f8fSGustavo F. Padovan 38840a708f8fSGustavo F. Padovan return 0; 38850a708f8fSGustavo F. Padovan } 38860a708f8fSGustavo F. Padovan 38870a708f8fSGustavo F. Padovan static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) 38880a708f8fSGustavo F. Padovan { 38890a708f8fSGustavo F. Padovan struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; 38900a708f8fSGustavo F. Padovan u16 type, result; 38910a708f8fSGustavo F. Padovan 38920a708f8fSGustavo F. Padovan type = __le16_to_cpu(rsp->type); 38930a708f8fSGustavo F. Padovan result = __le16_to_cpu(rsp->result); 38940a708f8fSGustavo F. Padovan 38950a708f8fSGustavo F. Padovan BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); 38960a708f8fSGustavo F. Padovan 3897e90165beSAndrei Emeltchenko /* L2CAP Info req/rsp are unbound to channels, add extra checks */ 3898e90165beSAndrei Emeltchenko if (cmd->ident != conn->info_ident || 3899e90165beSAndrei Emeltchenko conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) 3900e90165beSAndrei Emeltchenko return 0; 3901e90165beSAndrei Emeltchenko 390217cd3f37SUlisses Furquim cancel_delayed_work(&conn->info_timer); 39030a708f8fSGustavo F. Padovan 39040a708f8fSGustavo F. Padovan if (result != L2CAP_IR_SUCCESS) { 39050a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 39060a708f8fSGustavo F. Padovan conn->info_ident = 0; 39070a708f8fSGustavo F. Padovan 39080a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 39090a708f8fSGustavo F. Padovan 39100a708f8fSGustavo F. Padovan return 0; 39110a708f8fSGustavo F. Padovan } 39120a708f8fSGustavo F. Padovan 3913978c93b9SAndrei Emeltchenko switch (type) { 3914978c93b9SAndrei Emeltchenko case L2CAP_IT_FEAT_MASK: 39150a708f8fSGustavo F. Padovan conn->feat_mask = get_unaligned_le32(rsp->data); 39160a708f8fSGustavo F. Padovan 39170a708f8fSGustavo F. Padovan if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { 39180a708f8fSGustavo F. Padovan struct l2cap_info_req req; 3919ac73498cSAndrei Emeltchenko req.type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN); 39200a708f8fSGustavo F. Padovan 39210a708f8fSGustavo F. Padovan conn->info_ident = l2cap_get_ident(conn); 39220a708f8fSGustavo F. Padovan 39230a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, conn->info_ident, 39240a708f8fSGustavo F. Padovan L2CAP_INFO_REQ, sizeof(req), &req); 39250a708f8fSGustavo F. Padovan } else { 39260a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 39270a708f8fSGustavo F. Padovan conn->info_ident = 0; 39280a708f8fSGustavo F. Padovan 39290a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 39300a708f8fSGustavo F. Padovan } 3931978c93b9SAndrei Emeltchenko break; 3932978c93b9SAndrei Emeltchenko 3933978c93b9SAndrei Emeltchenko case L2CAP_IT_FIXED_CHAN: 3934978c93b9SAndrei Emeltchenko conn->fixed_chan_mask = rsp->data[0]; 39350a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 39360a708f8fSGustavo F. Padovan conn->info_ident = 0; 39370a708f8fSGustavo F. Padovan 39380a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 3939978c93b9SAndrei Emeltchenko break; 39400a708f8fSGustavo F. Padovan } 39410a708f8fSGustavo F. Padovan 39420a708f8fSGustavo F. Padovan return 0; 39430a708f8fSGustavo F. Padovan } 39440a708f8fSGustavo F. Padovan 3945f94ff6ffSMat Martineau static inline int l2cap_create_channel_req(struct l2cap_conn *conn, 3946f94ff6ffSMat Martineau struct l2cap_cmd_hdr *cmd, u16 cmd_len, 3947f94ff6ffSMat Martineau void *data) 3948f94ff6ffSMat Martineau { 3949f94ff6ffSMat Martineau struct l2cap_create_chan_req *req = data; 3950f94ff6ffSMat Martineau struct l2cap_create_chan_rsp rsp; 3951f94ff6ffSMat Martineau u16 psm, scid; 3952f94ff6ffSMat Martineau 3953f94ff6ffSMat Martineau if (cmd_len != sizeof(*req)) 3954f94ff6ffSMat Martineau return -EPROTO; 3955f94ff6ffSMat Martineau 3956f94ff6ffSMat Martineau if (!enable_hs) 3957f94ff6ffSMat Martineau return -EINVAL; 3958f94ff6ffSMat Martineau 3959f94ff6ffSMat Martineau psm = le16_to_cpu(req->psm); 3960f94ff6ffSMat Martineau scid = le16_to_cpu(req->scid); 3961f94ff6ffSMat Martineau 3962ad0ac6caSAndrei Emeltchenko BT_DBG("psm 0x%2.2x, scid 0x%4.4x, amp_id %d", psm, scid, req->amp_id); 3963f94ff6ffSMat Martineau 3964f94ff6ffSMat Martineau /* Placeholder: Always reject */ 3965f94ff6ffSMat Martineau rsp.dcid = 0; 3966f94ff6ffSMat Martineau rsp.scid = cpu_to_le16(scid); 39678ce0c498SAndrei Emeltchenko rsp.result = __constant_cpu_to_le16(L2CAP_CR_NO_MEM); 39688ce0c498SAndrei Emeltchenko rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); 3969f94ff6ffSMat Martineau 3970f94ff6ffSMat Martineau l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP, 3971f94ff6ffSMat Martineau sizeof(rsp), &rsp); 3972f94ff6ffSMat Martineau 3973f94ff6ffSMat Martineau return 0; 3974f94ff6ffSMat Martineau } 3975f94ff6ffSMat Martineau 3976f94ff6ffSMat Martineau static inline int l2cap_create_channel_rsp(struct l2cap_conn *conn, 3977f94ff6ffSMat Martineau struct l2cap_cmd_hdr *cmd, void *data) 3978f94ff6ffSMat Martineau { 3979f94ff6ffSMat Martineau BT_DBG("conn %p", conn); 3980f94ff6ffSMat Martineau 3981f94ff6ffSMat Martineau return l2cap_connect_rsp(conn, cmd, data); 3982f94ff6ffSMat Martineau } 3983f94ff6ffSMat Martineau 39848d5a04a1SMat Martineau static void l2cap_send_move_chan_rsp(struct l2cap_conn *conn, u8 ident, 39858d5a04a1SMat Martineau u16 icid, u16 result) 39868d5a04a1SMat Martineau { 39878d5a04a1SMat Martineau struct l2cap_move_chan_rsp rsp; 39888d5a04a1SMat Martineau 3989ad0ac6caSAndrei Emeltchenko BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); 39908d5a04a1SMat Martineau 39918d5a04a1SMat Martineau rsp.icid = cpu_to_le16(icid); 39928d5a04a1SMat Martineau rsp.result = cpu_to_le16(result); 39938d5a04a1SMat Martineau 39948d5a04a1SMat Martineau l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_RSP, sizeof(rsp), &rsp); 39958d5a04a1SMat Martineau } 39968d5a04a1SMat Martineau 39978d5a04a1SMat Martineau static void l2cap_send_move_chan_cfm(struct l2cap_conn *conn, 3998ad0ac6caSAndrei Emeltchenko struct l2cap_chan *chan, 3999ad0ac6caSAndrei Emeltchenko u16 icid, u16 result) 40008d5a04a1SMat Martineau { 40018d5a04a1SMat Martineau struct l2cap_move_chan_cfm cfm; 40028d5a04a1SMat Martineau u8 ident; 40038d5a04a1SMat Martineau 4004ad0ac6caSAndrei Emeltchenko BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); 40058d5a04a1SMat Martineau 40068d5a04a1SMat Martineau ident = l2cap_get_ident(conn); 40078d5a04a1SMat Martineau if (chan) 40088d5a04a1SMat Martineau chan->ident = ident; 40098d5a04a1SMat Martineau 40108d5a04a1SMat Martineau cfm.icid = cpu_to_le16(icid); 40118d5a04a1SMat Martineau cfm.result = cpu_to_le16(result); 40128d5a04a1SMat Martineau 40138d5a04a1SMat Martineau l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM, sizeof(cfm), &cfm); 40148d5a04a1SMat Martineau } 40158d5a04a1SMat Martineau 40168d5a04a1SMat Martineau static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident, 40178d5a04a1SMat Martineau u16 icid) 40188d5a04a1SMat Martineau { 40198d5a04a1SMat Martineau struct l2cap_move_chan_cfm_rsp rsp; 40208d5a04a1SMat Martineau 4021ad0ac6caSAndrei Emeltchenko BT_DBG("icid 0x%4.4x", icid); 40228d5a04a1SMat Martineau 40238d5a04a1SMat Martineau rsp.icid = cpu_to_le16(icid); 40248d5a04a1SMat Martineau l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp); 40258d5a04a1SMat Martineau } 40268d5a04a1SMat Martineau 40278d5a04a1SMat Martineau static inline int l2cap_move_channel_req(struct l2cap_conn *conn, 4028ad0ac6caSAndrei Emeltchenko struct l2cap_cmd_hdr *cmd, 4029ad0ac6caSAndrei Emeltchenko u16 cmd_len, void *data) 40308d5a04a1SMat Martineau { 40318d5a04a1SMat Martineau struct l2cap_move_chan_req *req = data; 40328d5a04a1SMat Martineau u16 icid = 0; 40338d5a04a1SMat Martineau u16 result = L2CAP_MR_NOT_ALLOWED; 40348d5a04a1SMat Martineau 40358d5a04a1SMat Martineau if (cmd_len != sizeof(*req)) 40368d5a04a1SMat Martineau return -EPROTO; 40378d5a04a1SMat Martineau 40388d5a04a1SMat Martineau icid = le16_to_cpu(req->icid); 40398d5a04a1SMat Martineau 4040ad0ac6caSAndrei Emeltchenko BT_DBG("icid 0x%4.4x, dest_amp_id %d", icid, req->dest_amp_id); 40418d5a04a1SMat Martineau 40428d5a04a1SMat Martineau if (!enable_hs) 40438d5a04a1SMat Martineau return -EINVAL; 40448d5a04a1SMat Martineau 40458d5a04a1SMat Martineau /* Placeholder: Always refuse */ 40468d5a04a1SMat Martineau l2cap_send_move_chan_rsp(conn, cmd->ident, icid, result); 40478d5a04a1SMat Martineau 40488d5a04a1SMat Martineau return 0; 40498d5a04a1SMat Martineau } 40508d5a04a1SMat Martineau 40518d5a04a1SMat Martineau static inline int l2cap_move_channel_rsp(struct l2cap_conn *conn, 4052ad0ac6caSAndrei Emeltchenko struct l2cap_cmd_hdr *cmd, 4053ad0ac6caSAndrei Emeltchenko u16 cmd_len, void *data) 40548d5a04a1SMat Martineau { 40558d5a04a1SMat Martineau struct l2cap_move_chan_rsp *rsp = data; 40568d5a04a1SMat Martineau u16 icid, result; 40578d5a04a1SMat Martineau 40588d5a04a1SMat Martineau if (cmd_len != sizeof(*rsp)) 40598d5a04a1SMat Martineau return -EPROTO; 40608d5a04a1SMat Martineau 40618d5a04a1SMat Martineau icid = le16_to_cpu(rsp->icid); 40628d5a04a1SMat Martineau result = le16_to_cpu(rsp->result); 40638d5a04a1SMat Martineau 4064ad0ac6caSAndrei Emeltchenko BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); 40658d5a04a1SMat Martineau 40668d5a04a1SMat Martineau /* Placeholder: Always unconfirmed */ 40678d5a04a1SMat Martineau l2cap_send_move_chan_cfm(conn, NULL, icid, L2CAP_MC_UNCONFIRMED); 40688d5a04a1SMat Martineau 40698d5a04a1SMat Martineau return 0; 40708d5a04a1SMat Martineau } 40718d5a04a1SMat Martineau 40728d5a04a1SMat Martineau static inline int l2cap_move_channel_confirm(struct l2cap_conn *conn, 4073ad0ac6caSAndrei Emeltchenko struct l2cap_cmd_hdr *cmd, 4074ad0ac6caSAndrei Emeltchenko u16 cmd_len, void *data) 40758d5a04a1SMat Martineau { 40768d5a04a1SMat Martineau struct l2cap_move_chan_cfm *cfm = data; 40778d5a04a1SMat Martineau u16 icid, result; 40788d5a04a1SMat Martineau 40798d5a04a1SMat Martineau if (cmd_len != sizeof(*cfm)) 40808d5a04a1SMat Martineau return -EPROTO; 40818d5a04a1SMat Martineau 40828d5a04a1SMat Martineau icid = le16_to_cpu(cfm->icid); 40838d5a04a1SMat Martineau result = le16_to_cpu(cfm->result); 40848d5a04a1SMat Martineau 4085ad0ac6caSAndrei Emeltchenko BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); 40868d5a04a1SMat Martineau 40878d5a04a1SMat Martineau l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); 40888d5a04a1SMat Martineau 40898d5a04a1SMat Martineau return 0; 40908d5a04a1SMat Martineau } 40918d5a04a1SMat Martineau 40928d5a04a1SMat Martineau static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn, 4093ad0ac6caSAndrei Emeltchenko struct l2cap_cmd_hdr *cmd, 4094ad0ac6caSAndrei Emeltchenko u16 cmd_len, void *data) 40958d5a04a1SMat Martineau { 40968d5a04a1SMat Martineau struct l2cap_move_chan_cfm_rsp *rsp = data; 40978d5a04a1SMat Martineau u16 icid; 40988d5a04a1SMat Martineau 40998d5a04a1SMat Martineau if (cmd_len != sizeof(*rsp)) 41008d5a04a1SMat Martineau return -EPROTO; 41018d5a04a1SMat Martineau 41028d5a04a1SMat Martineau icid = le16_to_cpu(rsp->icid); 41038d5a04a1SMat Martineau 4104ad0ac6caSAndrei Emeltchenko BT_DBG("icid 0x%4.4x", icid); 41058d5a04a1SMat Martineau 41068d5a04a1SMat Martineau return 0; 41078d5a04a1SMat Martineau } 41088d5a04a1SMat Martineau 4109e2174ca4SGustavo F. Padovan static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency, 4110de73115aSClaudio Takahasi u16 to_multiplier) 4111de73115aSClaudio Takahasi { 4112de73115aSClaudio Takahasi u16 max_latency; 4113de73115aSClaudio Takahasi 4114de73115aSClaudio Takahasi if (min > max || min < 6 || max > 3200) 4115de73115aSClaudio Takahasi return -EINVAL; 4116de73115aSClaudio Takahasi 4117de73115aSClaudio Takahasi if (to_multiplier < 10 || to_multiplier > 3200) 4118de73115aSClaudio Takahasi return -EINVAL; 4119de73115aSClaudio Takahasi 4120de73115aSClaudio Takahasi if (max >= to_multiplier * 8) 4121de73115aSClaudio Takahasi return -EINVAL; 4122de73115aSClaudio Takahasi 4123de73115aSClaudio Takahasi max_latency = (to_multiplier * 8 / max) - 1; 4124de73115aSClaudio Takahasi if (latency > 499 || latency > max_latency) 4125de73115aSClaudio Takahasi return -EINVAL; 4126de73115aSClaudio Takahasi 4127de73115aSClaudio Takahasi return 0; 4128de73115aSClaudio Takahasi } 4129de73115aSClaudio Takahasi 4130de73115aSClaudio Takahasi static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, 4131de73115aSClaudio Takahasi struct l2cap_cmd_hdr *cmd, u8 *data) 4132de73115aSClaudio Takahasi { 4133de73115aSClaudio Takahasi struct hci_conn *hcon = conn->hcon; 4134de73115aSClaudio Takahasi struct l2cap_conn_param_update_req *req; 4135de73115aSClaudio Takahasi struct l2cap_conn_param_update_rsp rsp; 4136de73115aSClaudio Takahasi u16 min, max, latency, to_multiplier, cmd_len; 41372ce603ebSClaudio Takahasi int err; 4138de73115aSClaudio Takahasi 4139de73115aSClaudio Takahasi if (!(hcon->link_mode & HCI_LM_MASTER)) 4140de73115aSClaudio Takahasi return -EINVAL; 4141de73115aSClaudio Takahasi 4142de73115aSClaudio Takahasi cmd_len = __le16_to_cpu(cmd->len); 4143de73115aSClaudio Takahasi if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) 4144de73115aSClaudio Takahasi return -EPROTO; 4145de73115aSClaudio Takahasi 4146de73115aSClaudio Takahasi req = (struct l2cap_conn_param_update_req *) data; 4147de73115aSClaudio Takahasi min = __le16_to_cpu(req->min); 4148de73115aSClaudio Takahasi max = __le16_to_cpu(req->max); 4149de73115aSClaudio Takahasi latency = __le16_to_cpu(req->latency); 4150de73115aSClaudio Takahasi to_multiplier = __le16_to_cpu(req->to_multiplier); 4151de73115aSClaudio Takahasi 4152de73115aSClaudio Takahasi BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", 4153de73115aSClaudio Takahasi min, max, latency, to_multiplier); 4154de73115aSClaudio Takahasi 4155de73115aSClaudio Takahasi memset(&rsp, 0, sizeof(rsp)); 41562ce603ebSClaudio Takahasi 41572ce603ebSClaudio Takahasi err = l2cap_check_conn_param(min, max, latency, to_multiplier); 41582ce603ebSClaudio Takahasi if (err) 4159ac73498cSAndrei Emeltchenko rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); 4160de73115aSClaudio Takahasi else 4161ac73498cSAndrei Emeltchenko rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); 4162de73115aSClaudio Takahasi 4163de73115aSClaudio Takahasi l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, 4164de73115aSClaudio Takahasi sizeof(rsp), &rsp); 4165de73115aSClaudio Takahasi 41662ce603ebSClaudio Takahasi if (!err) 41672ce603ebSClaudio Takahasi hci_le_conn_update(hcon, min, max, latency, to_multiplier); 41682ce603ebSClaudio Takahasi 4169de73115aSClaudio Takahasi return 0; 4170de73115aSClaudio Takahasi } 4171de73115aSClaudio Takahasi 41723300d9a9SClaudio Takahasi static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, 41733300d9a9SClaudio Takahasi struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) 41743300d9a9SClaudio Takahasi { 41753300d9a9SClaudio Takahasi int err = 0; 41763300d9a9SClaudio Takahasi 41773300d9a9SClaudio Takahasi switch (cmd->code) { 41783300d9a9SClaudio Takahasi case L2CAP_COMMAND_REJ: 41793300d9a9SClaudio Takahasi l2cap_command_rej(conn, cmd, data); 41803300d9a9SClaudio Takahasi break; 41813300d9a9SClaudio Takahasi 41823300d9a9SClaudio Takahasi case L2CAP_CONN_REQ: 41833300d9a9SClaudio Takahasi err = l2cap_connect_req(conn, cmd, data); 41843300d9a9SClaudio Takahasi break; 41853300d9a9SClaudio Takahasi 41863300d9a9SClaudio Takahasi case L2CAP_CONN_RSP: 41873300d9a9SClaudio Takahasi err = l2cap_connect_rsp(conn, cmd, data); 41883300d9a9SClaudio Takahasi break; 41893300d9a9SClaudio Takahasi 41903300d9a9SClaudio Takahasi case L2CAP_CONF_REQ: 41913300d9a9SClaudio Takahasi err = l2cap_config_req(conn, cmd, cmd_len, data); 41923300d9a9SClaudio Takahasi break; 41933300d9a9SClaudio Takahasi 41943300d9a9SClaudio Takahasi case L2CAP_CONF_RSP: 41953300d9a9SClaudio Takahasi err = l2cap_config_rsp(conn, cmd, data); 41963300d9a9SClaudio Takahasi break; 41973300d9a9SClaudio Takahasi 41983300d9a9SClaudio Takahasi case L2CAP_DISCONN_REQ: 41993300d9a9SClaudio Takahasi err = l2cap_disconnect_req(conn, cmd, data); 42003300d9a9SClaudio Takahasi break; 42013300d9a9SClaudio Takahasi 42023300d9a9SClaudio Takahasi case L2CAP_DISCONN_RSP: 42033300d9a9SClaudio Takahasi err = l2cap_disconnect_rsp(conn, cmd, data); 42043300d9a9SClaudio Takahasi break; 42053300d9a9SClaudio Takahasi 42063300d9a9SClaudio Takahasi case L2CAP_ECHO_REQ: 42073300d9a9SClaudio Takahasi l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); 42083300d9a9SClaudio Takahasi break; 42093300d9a9SClaudio Takahasi 42103300d9a9SClaudio Takahasi case L2CAP_ECHO_RSP: 42113300d9a9SClaudio Takahasi break; 42123300d9a9SClaudio Takahasi 42133300d9a9SClaudio Takahasi case L2CAP_INFO_REQ: 42143300d9a9SClaudio Takahasi err = l2cap_information_req(conn, cmd, data); 42153300d9a9SClaudio Takahasi break; 42163300d9a9SClaudio Takahasi 42173300d9a9SClaudio Takahasi case L2CAP_INFO_RSP: 42183300d9a9SClaudio Takahasi err = l2cap_information_rsp(conn, cmd, data); 42193300d9a9SClaudio Takahasi break; 42203300d9a9SClaudio Takahasi 4221f94ff6ffSMat Martineau case L2CAP_CREATE_CHAN_REQ: 4222f94ff6ffSMat Martineau err = l2cap_create_channel_req(conn, cmd, cmd_len, data); 4223f94ff6ffSMat Martineau break; 4224f94ff6ffSMat Martineau 4225f94ff6ffSMat Martineau case L2CAP_CREATE_CHAN_RSP: 4226f94ff6ffSMat Martineau err = l2cap_create_channel_rsp(conn, cmd, data); 4227f94ff6ffSMat Martineau break; 4228f94ff6ffSMat Martineau 42298d5a04a1SMat Martineau case L2CAP_MOVE_CHAN_REQ: 42308d5a04a1SMat Martineau err = l2cap_move_channel_req(conn, cmd, cmd_len, data); 42318d5a04a1SMat Martineau break; 42328d5a04a1SMat Martineau 42338d5a04a1SMat Martineau case L2CAP_MOVE_CHAN_RSP: 42348d5a04a1SMat Martineau err = l2cap_move_channel_rsp(conn, cmd, cmd_len, data); 42358d5a04a1SMat Martineau break; 42368d5a04a1SMat Martineau 42378d5a04a1SMat Martineau case L2CAP_MOVE_CHAN_CFM: 42388d5a04a1SMat Martineau err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data); 42398d5a04a1SMat Martineau break; 42408d5a04a1SMat Martineau 42418d5a04a1SMat Martineau case L2CAP_MOVE_CHAN_CFM_RSP: 42428d5a04a1SMat Martineau err = l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data); 42438d5a04a1SMat Martineau break; 42448d5a04a1SMat Martineau 42453300d9a9SClaudio Takahasi default: 42463300d9a9SClaudio Takahasi BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); 42473300d9a9SClaudio Takahasi err = -EINVAL; 42483300d9a9SClaudio Takahasi break; 42493300d9a9SClaudio Takahasi } 42503300d9a9SClaudio Takahasi 42513300d9a9SClaudio Takahasi return err; 42523300d9a9SClaudio Takahasi } 42533300d9a9SClaudio Takahasi 42543300d9a9SClaudio Takahasi static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, 42553300d9a9SClaudio Takahasi struct l2cap_cmd_hdr *cmd, u8 *data) 42563300d9a9SClaudio Takahasi { 42573300d9a9SClaudio Takahasi switch (cmd->code) { 42583300d9a9SClaudio Takahasi case L2CAP_COMMAND_REJ: 42593300d9a9SClaudio Takahasi return 0; 42603300d9a9SClaudio Takahasi 42613300d9a9SClaudio Takahasi case L2CAP_CONN_PARAM_UPDATE_REQ: 4262de73115aSClaudio Takahasi return l2cap_conn_param_update_req(conn, cmd, data); 42633300d9a9SClaudio Takahasi 42643300d9a9SClaudio Takahasi case L2CAP_CONN_PARAM_UPDATE_RSP: 42653300d9a9SClaudio Takahasi return 0; 42663300d9a9SClaudio Takahasi 42673300d9a9SClaudio Takahasi default: 42683300d9a9SClaudio Takahasi BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); 42693300d9a9SClaudio Takahasi return -EINVAL; 42703300d9a9SClaudio Takahasi } 42713300d9a9SClaudio Takahasi } 42723300d9a9SClaudio Takahasi 42733300d9a9SClaudio Takahasi static inline void l2cap_sig_channel(struct l2cap_conn *conn, 42743300d9a9SClaudio Takahasi struct sk_buff *skb) 42750a708f8fSGustavo F. Padovan { 42760a708f8fSGustavo F. Padovan u8 *data = skb->data; 42770a708f8fSGustavo F. Padovan int len = skb->len; 42780a708f8fSGustavo F. Padovan struct l2cap_cmd_hdr cmd; 42793300d9a9SClaudio Takahasi int err; 42800a708f8fSGustavo F. Padovan 42810a708f8fSGustavo F. Padovan l2cap_raw_recv(conn, skb); 42820a708f8fSGustavo F. Padovan 42830a708f8fSGustavo F. Padovan while (len >= L2CAP_CMD_HDR_SIZE) { 42840a708f8fSGustavo F. Padovan u16 cmd_len; 42850a708f8fSGustavo F. Padovan memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); 42860a708f8fSGustavo F. Padovan data += L2CAP_CMD_HDR_SIZE; 42870a708f8fSGustavo F. Padovan len -= L2CAP_CMD_HDR_SIZE; 42880a708f8fSGustavo F. Padovan 42890a708f8fSGustavo F. Padovan cmd_len = le16_to_cpu(cmd.len); 42900a708f8fSGustavo F. Padovan 42910a708f8fSGustavo F. Padovan BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident); 42920a708f8fSGustavo F. Padovan 42930a708f8fSGustavo F. Padovan if (cmd_len > len || !cmd.ident) { 42940a708f8fSGustavo F. Padovan BT_DBG("corrupted command"); 42950a708f8fSGustavo F. Padovan break; 42960a708f8fSGustavo F. Padovan } 42970a708f8fSGustavo F. Padovan 42983300d9a9SClaudio Takahasi if (conn->hcon->type == LE_LINK) 42993300d9a9SClaudio Takahasi err = l2cap_le_sig_cmd(conn, &cmd, data); 43003300d9a9SClaudio Takahasi else 43013300d9a9SClaudio Takahasi err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); 43020a708f8fSGustavo F. Padovan 43030a708f8fSGustavo F. Padovan if (err) { 4304e2fd318eSIlia Kolomisnky struct l2cap_cmd_rej_unk rej; 43052c6d1a2eSGustavo F. Padovan 43062c6d1a2eSGustavo F. Padovan BT_ERR("Wrong link type (%d)", err); 43070a708f8fSGustavo F. Padovan 43080a708f8fSGustavo F. Padovan /* FIXME: Map err to a valid reason */ 4309ac73498cSAndrei Emeltchenko rej.reason = __constant_cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); 43100a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); 43110a708f8fSGustavo F. Padovan } 43120a708f8fSGustavo F. Padovan 43130a708f8fSGustavo F. Padovan data += cmd_len; 43140a708f8fSGustavo F. Padovan len -= cmd_len; 43150a708f8fSGustavo F. Padovan } 43160a708f8fSGustavo F. Padovan 43170a708f8fSGustavo F. Padovan kfree_skb(skb); 43180a708f8fSGustavo F. Padovan } 43190a708f8fSGustavo F. Padovan 432047d1ec61SGustavo F. Padovan static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb) 43210a708f8fSGustavo F. Padovan { 43220a708f8fSGustavo F. Padovan u16 our_fcs, rcv_fcs; 4323e4ca6d98SAndrei Emeltchenko int hdr_size; 4324e4ca6d98SAndrei Emeltchenko 4325e4ca6d98SAndrei Emeltchenko if (test_bit(FLAG_EXT_CTRL, &chan->flags)) 4326e4ca6d98SAndrei Emeltchenko hdr_size = L2CAP_EXT_HDR_SIZE; 4327e4ca6d98SAndrei Emeltchenko else 4328e4ca6d98SAndrei Emeltchenko hdr_size = L2CAP_ENH_HDR_SIZE; 43290a708f8fSGustavo F. Padovan 433047d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) { 433103a51213SAndrei Emeltchenko skb_trim(skb, skb->len - L2CAP_FCS_SIZE); 43320a708f8fSGustavo F. Padovan rcv_fcs = get_unaligned_le16(skb->data + skb->len); 43330a708f8fSGustavo F. Padovan our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); 43340a708f8fSGustavo F. Padovan 43350a708f8fSGustavo F. Padovan if (our_fcs != rcv_fcs) 43360a708f8fSGustavo F. Padovan return -EBADMSG; 43370a708f8fSGustavo F. Padovan } 43380a708f8fSGustavo F. Padovan return 0; 43390a708f8fSGustavo F. Padovan } 43400a708f8fSGustavo F. Padovan 43416ea00485SMat Martineau static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) 43420a708f8fSGustavo F. Padovan { 4343e31f7633SMat Martineau struct l2cap_ctrl control; 43440a708f8fSGustavo F. Padovan 4345e31f7633SMat Martineau BT_DBG("chan %p", chan); 43460a708f8fSGustavo F. Padovan 4347e31f7633SMat Martineau memset(&control, 0, sizeof(control)); 4348e31f7633SMat Martineau control.sframe = 1; 4349e31f7633SMat Martineau control.final = 1; 4350e31f7633SMat Martineau control.reqseq = chan->buffer_seq; 4351e31f7633SMat Martineau set_bit(CONN_SEND_FBIT, &chan->conn_state); 43520a708f8fSGustavo F. Padovan 4353e2ab4353SGustavo F. Padovan if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { 4354e31f7633SMat Martineau control.super = L2CAP_SUPER_RNR; 4355e31f7633SMat Martineau l2cap_send_sframe(chan, &control); 43560a708f8fSGustavo F. Padovan } 43570a708f8fSGustavo F. Padovan 4358e31f7633SMat Martineau if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) && 4359e31f7633SMat Martineau chan->unacked_frames > 0) 4360e31f7633SMat Martineau __set_retrans_timer(chan); 43610a708f8fSGustavo F. Padovan 4362e31f7633SMat Martineau /* Send pending iframes */ 4363525cd185SGustavo F. Padovan l2cap_ertm_send(chan); 43640a708f8fSGustavo F. Padovan 4365e2ab4353SGustavo F. Padovan if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && 4366e31f7633SMat Martineau test_bit(CONN_SEND_FBIT, &chan->conn_state)) { 4367e31f7633SMat Martineau /* F-bit wasn't sent in an s-frame or i-frame yet, so 4368e31f7633SMat Martineau * send it now. 4369e31f7633SMat Martineau */ 4370e31f7633SMat Martineau control.super = L2CAP_SUPER_RR; 4371e31f7633SMat Martineau l2cap_send_sframe(chan, &control); 43720a708f8fSGustavo F. Padovan } 43730a708f8fSGustavo F. Padovan } 43740a708f8fSGustavo F. Padovan 437584084a31SMat Martineau static void append_skb_frag(struct sk_buff *skb, 437684084a31SMat Martineau struct sk_buff *new_frag, struct sk_buff **last_frag) 43770a708f8fSGustavo F. Padovan { 437884084a31SMat Martineau /* skb->len reflects data in skb as well as all fragments 437984084a31SMat Martineau * skb->data_len reflects only data in fragments 438084084a31SMat Martineau */ 438184084a31SMat Martineau if (!skb_has_frag_list(skb)) 438284084a31SMat Martineau skb_shinfo(skb)->frag_list = new_frag; 438384084a31SMat Martineau 438484084a31SMat Martineau new_frag->next = NULL; 438584084a31SMat Martineau 438684084a31SMat Martineau (*last_frag)->next = new_frag; 438784084a31SMat Martineau *last_frag = new_frag; 438884084a31SMat Martineau 438984084a31SMat Martineau skb->len += new_frag->len; 439084084a31SMat Martineau skb->data_len += new_frag->len; 439184084a31SMat Martineau skb->truesize += new_frag->truesize; 439284084a31SMat Martineau } 439384084a31SMat Martineau 43944b51dae9SMat Martineau static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb, 43954b51dae9SMat Martineau struct l2cap_ctrl *control) 439684084a31SMat Martineau { 439784084a31SMat Martineau int err = -EINVAL; 43980a708f8fSGustavo F. Padovan 43994b51dae9SMat Martineau switch (control->sar) { 44007e0ef6eeSAndrei Emeltchenko case L2CAP_SAR_UNSEGMENTED: 440184084a31SMat Martineau if (chan->sdu) 440284084a31SMat Martineau break; 44030a708f8fSGustavo F. Padovan 440480b98027SGustavo Padovan err = chan->ops->recv(chan, skb); 440584084a31SMat Martineau break; 44060a708f8fSGustavo F. Padovan 44077e0ef6eeSAndrei Emeltchenko case L2CAP_SAR_START: 440884084a31SMat Martineau if (chan->sdu) 440984084a31SMat Martineau break; 44100a708f8fSGustavo F. Padovan 44116f61fd47SGustavo F. Padovan chan->sdu_len = get_unaligned_le16(skb->data); 441203a51213SAndrei Emeltchenko skb_pull(skb, L2CAP_SDULEN_SIZE); 44130a708f8fSGustavo F. Padovan 441484084a31SMat Martineau if (chan->sdu_len > chan->imtu) { 441584084a31SMat Martineau err = -EMSGSIZE; 441684084a31SMat Martineau break; 441784084a31SMat Martineau } 44180a708f8fSGustavo F. Padovan 441984084a31SMat Martineau if (skb->len >= chan->sdu_len) 442084084a31SMat Martineau break; 442184084a31SMat Martineau 442284084a31SMat Martineau chan->sdu = skb; 442384084a31SMat Martineau chan->sdu_last_frag = skb; 442484084a31SMat Martineau 442584084a31SMat Martineau skb = NULL; 442684084a31SMat Martineau err = 0; 44270a708f8fSGustavo F. Padovan break; 44280a708f8fSGustavo F. Padovan 44297e0ef6eeSAndrei Emeltchenko case L2CAP_SAR_CONTINUE: 44306f61fd47SGustavo F. Padovan if (!chan->sdu) 443184084a31SMat Martineau break; 44320a708f8fSGustavo F. Padovan 443384084a31SMat Martineau append_skb_frag(chan->sdu, skb, 443484084a31SMat Martineau &chan->sdu_last_frag); 443584084a31SMat Martineau skb = NULL; 44360a708f8fSGustavo F. Padovan 443784084a31SMat Martineau if (chan->sdu->len >= chan->sdu_len) 443884084a31SMat Martineau break; 44390a708f8fSGustavo F. Padovan 444084084a31SMat Martineau err = 0; 44410a708f8fSGustavo F. Padovan break; 44420a708f8fSGustavo F. Padovan 44437e0ef6eeSAndrei Emeltchenko case L2CAP_SAR_END: 44446f61fd47SGustavo F. Padovan if (!chan->sdu) 444584084a31SMat Martineau break; 44460a708f8fSGustavo F. Padovan 444784084a31SMat Martineau append_skb_frag(chan->sdu, skb, 444884084a31SMat Martineau &chan->sdu_last_frag); 444984084a31SMat Martineau skb = NULL; 44500a708f8fSGustavo F. Padovan 445184084a31SMat Martineau if (chan->sdu->len != chan->sdu_len) 445284084a31SMat Martineau break; 44530a708f8fSGustavo F. Padovan 445480b98027SGustavo Padovan err = chan->ops->recv(chan, chan->sdu); 44550a708f8fSGustavo F. Padovan 445684084a31SMat Martineau if (!err) { 445784084a31SMat Martineau /* Reassembly complete */ 445884084a31SMat Martineau chan->sdu = NULL; 445984084a31SMat Martineau chan->sdu_last_frag = NULL; 446084084a31SMat Martineau chan->sdu_len = 0; 44610a708f8fSGustavo F. Padovan } 44620a708f8fSGustavo F. Padovan break; 44630a708f8fSGustavo F. Padovan } 44640a708f8fSGustavo F. Padovan 446584084a31SMat Martineau if (err) { 44660a708f8fSGustavo F. Padovan kfree_skb(skb); 44676f61fd47SGustavo F. Padovan kfree_skb(chan->sdu); 44686f61fd47SGustavo F. Padovan chan->sdu = NULL; 446984084a31SMat Martineau chan->sdu_last_frag = NULL; 447084084a31SMat Martineau chan->sdu_len = 0; 447184084a31SMat Martineau } 44720a708f8fSGustavo F. Padovan 447384084a31SMat Martineau return err; 44740a708f8fSGustavo F. Padovan } 44750a708f8fSGustavo F. Padovan 4476e328140fSMat Martineau void l2cap_chan_busy(struct l2cap_chan *chan, int busy) 44770a708f8fSGustavo F. Padovan { 447861aa4f5bSMat Martineau u8 event; 447961aa4f5bSMat Martineau 448061aa4f5bSMat Martineau if (chan->mode != L2CAP_MODE_ERTM) 448161aa4f5bSMat Martineau return; 448261aa4f5bSMat Martineau 448361aa4f5bSMat Martineau event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR; 4484401bb1f7SAndrei Emeltchenko l2cap_tx(chan, NULL, NULL, event); 44850a708f8fSGustavo F. Padovan } 44860a708f8fSGustavo F. Padovan 4487d2a7ac5dSMat Martineau static int l2cap_rx_queued_iframes(struct l2cap_chan *chan) 4488d2a7ac5dSMat Martineau { 448963838725SMat Martineau int err = 0; 449063838725SMat Martineau /* Pass sequential frames to l2cap_reassemble_sdu() 449163838725SMat Martineau * until a gap is encountered. 449263838725SMat Martineau */ 449363838725SMat Martineau 449463838725SMat Martineau BT_DBG("chan %p", chan); 449563838725SMat Martineau 449663838725SMat Martineau while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { 449763838725SMat Martineau struct sk_buff *skb; 449863838725SMat Martineau BT_DBG("Searching for skb with txseq %d (queue len %d)", 449963838725SMat Martineau chan->buffer_seq, skb_queue_len(&chan->srej_q)); 450063838725SMat Martineau 450163838725SMat Martineau skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq); 450263838725SMat Martineau 450363838725SMat Martineau if (!skb) 450463838725SMat Martineau break; 450563838725SMat Martineau 450663838725SMat Martineau skb_unlink(skb, &chan->srej_q); 450763838725SMat Martineau chan->buffer_seq = __next_seq(chan, chan->buffer_seq); 450863838725SMat Martineau err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->control); 450963838725SMat Martineau if (err) 451063838725SMat Martineau break; 451163838725SMat Martineau } 451263838725SMat Martineau 451363838725SMat Martineau if (skb_queue_empty(&chan->srej_q)) { 451463838725SMat Martineau chan->rx_state = L2CAP_RX_STATE_RECV; 451563838725SMat Martineau l2cap_send_ack(chan); 451663838725SMat Martineau } 451763838725SMat Martineau 451863838725SMat Martineau return err; 4519d2a7ac5dSMat Martineau } 4520d2a7ac5dSMat Martineau 4521d2a7ac5dSMat Martineau static void l2cap_handle_srej(struct l2cap_chan *chan, 4522d2a7ac5dSMat Martineau struct l2cap_ctrl *control) 4523d2a7ac5dSMat Martineau { 4524f80842a8SMat Martineau struct sk_buff *skb; 4525f80842a8SMat Martineau 4526f80842a8SMat Martineau BT_DBG("chan %p, control %p", chan, control); 4527f80842a8SMat Martineau 4528f80842a8SMat Martineau if (control->reqseq == chan->next_tx_seq) { 4529f80842a8SMat Martineau BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); 4530f80842a8SMat Martineau l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); 4531f80842a8SMat Martineau return; 4532f80842a8SMat Martineau } 4533f80842a8SMat Martineau 4534f80842a8SMat Martineau skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); 4535f80842a8SMat Martineau 4536f80842a8SMat Martineau if (skb == NULL) { 4537f80842a8SMat Martineau BT_DBG("Seq %d not available for retransmission", 4538f80842a8SMat Martineau control->reqseq); 4539f80842a8SMat Martineau return; 4540f80842a8SMat Martineau } 4541f80842a8SMat Martineau 4542f80842a8SMat Martineau if (chan->max_tx != 0 && bt_cb(skb)->control.retries >= chan->max_tx) { 4543f80842a8SMat Martineau BT_DBG("Retry limit exceeded (%d)", chan->max_tx); 4544f80842a8SMat Martineau l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); 4545f80842a8SMat Martineau return; 4546f80842a8SMat Martineau } 4547f80842a8SMat Martineau 4548f80842a8SMat Martineau clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); 4549f80842a8SMat Martineau 4550f80842a8SMat Martineau if (control->poll) { 4551f80842a8SMat Martineau l2cap_pass_to_tx(chan, control); 4552f80842a8SMat Martineau 4553f80842a8SMat Martineau set_bit(CONN_SEND_FBIT, &chan->conn_state); 4554f80842a8SMat Martineau l2cap_retransmit(chan, control); 4555f80842a8SMat Martineau l2cap_ertm_send(chan); 4556f80842a8SMat Martineau 4557f80842a8SMat Martineau if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { 4558f80842a8SMat Martineau set_bit(CONN_SREJ_ACT, &chan->conn_state); 4559f80842a8SMat Martineau chan->srej_save_reqseq = control->reqseq; 4560f80842a8SMat Martineau } 4561f80842a8SMat Martineau } else { 4562f80842a8SMat Martineau l2cap_pass_to_tx_fbit(chan, control); 4563f80842a8SMat Martineau 4564f80842a8SMat Martineau if (control->final) { 4565f80842a8SMat Martineau if (chan->srej_save_reqseq != control->reqseq || 4566f80842a8SMat Martineau !test_and_clear_bit(CONN_SREJ_ACT, 4567f80842a8SMat Martineau &chan->conn_state)) 4568f80842a8SMat Martineau l2cap_retransmit(chan, control); 4569f80842a8SMat Martineau } else { 4570f80842a8SMat Martineau l2cap_retransmit(chan, control); 4571f80842a8SMat Martineau if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { 4572f80842a8SMat Martineau set_bit(CONN_SREJ_ACT, &chan->conn_state); 4573f80842a8SMat Martineau chan->srej_save_reqseq = control->reqseq; 4574f80842a8SMat Martineau } 4575f80842a8SMat Martineau } 4576f80842a8SMat Martineau } 4577d2a7ac5dSMat Martineau } 4578d2a7ac5dSMat Martineau 4579d2a7ac5dSMat Martineau static void l2cap_handle_rej(struct l2cap_chan *chan, 4580d2a7ac5dSMat Martineau struct l2cap_ctrl *control) 4581d2a7ac5dSMat Martineau { 4582fcd289dfSMat Martineau struct sk_buff *skb; 4583fcd289dfSMat Martineau 4584fcd289dfSMat Martineau BT_DBG("chan %p, control %p", chan, control); 4585fcd289dfSMat Martineau 4586fcd289dfSMat Martineau if (control->reqseq == chan->next_tx_seq) { 4587fcd289dfSMat Martineau BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); 4588fcd289dfSMat Martineau l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); 4589fcd289dfSMat Martineau return; 4590fcd289dfSMat Martineau } 4591fcd289dfSMat Martineau 4592fcd289dfSMat Martineau skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); 4593fcd289dfSMat Martineau 4594fcd289dfSMat Martineau if (chan->max_tx && skb && 4595fcd289dfSMat Martineau bt_cb(skb)->control.retries >= chan->max_tx) { 4596fcd289dfSMat Martineau BT_DBG("Retry limit exceeded (%d)", chan->max_tx); 4597fcd289dfSMat Martineau l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); 4598fcd289dfSMat Martineau return; 4599fcd289dfSMat Martineau } 4600fcd289dfSMat Martineau 4601fcd289dfSMat Martineau clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); 4602fcd289dfSMat Martineau 4603fcd289dfSMat Martineau l2cap_pass_to_tx(chan, control); 4604fcd289dfSMat Martineau 4605fcd289dfSMat Martineau if (control->final) { 4606fcd289dfSMat Martineau if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) 4607fcd289dfSMat Martineau l2cap_retransmit_all(chan, control); 4608fcd289dfSMat Martineau } else { 4609fcd289dfSMat Martineau l2cap_retransmit_all(chan, control); 4610fcd289dfSMat Martineau l2cap_ertm_send(chan); 4611fcd289dfSMat Martineau if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) 4612fcd289dfSMat Martineau set_bit(CONN_REJ_ACT, &chan->conn_state); 4613fcd289dfSMat Martineau } 4614d2a7ac5dSMat Martineau } 4615d2a7ac5dSMat Martineau 46164b51dae9SMat Martineau static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq) 46174b51dae9SMat Martineau { 46184b51dae9SMat Martineau BT_DBG("chan %p, txseq %d", chan, txseq); 46194b51dae9SMat Martineau 46204b51dae9SMat Martineau BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq, 46214b51dae9SMat Martineau chan->expected_tx_seq); 46224b51dae9SMat Martineau 46234b51dae9SMat Martineau if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { 46244b51dae9SMat Martineau if (__seq_offset(chan, txseq, chan->last_acked_seq) >= 46254b51dae9SMat Martineau chan->tx_win) { 46264b51dae9SMat Martineau /* See notes below regarding "double poll" and 46274b51dae9SMat Martineau * invalid packets. 46284b51dae9SMat Martineau */ 46294b51dae9SMat Martineau if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { 46304b51dae9SMat Martineau BT_DBG("Invalid/Ignore - after SREJ"); 46314b51dae9SMat Martineau return L2CAP_TXSEQ_INVALID_IGNORE; 46324b51dae9SMat Martineau } else { 46334b51dae9SMat Martineau BT_DBG("Invalid - in window after SREJ sent"); 46344b51dae9SMat Martineau return L2CAP_TXSEQ_INVALID; 46354b51dae9SMat Martineau } 46364b51dae9SMat Martineau } 46374b51dae9SMat Martineau 46384b51dae9SMat Martineau if (chan->srej_list.head == txseq) { 46394b51dae9SMat Martineau BT_DBG("Expected SREJ"); 46404b51dae9SMat Martineau return L2CAP_TXSEQ_EXPECTED_SREJ; 46414b51dae9SMat Martineau } 46424b51dae9SMat Martineau 46434b51dae9SMat Martineau if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) { 46444b51dae9SMat Martineau BT_DBG("Duplicate SREJ - txseq already stored"); 46454b51dae9SMat Martineau return L2CAP_TXSEQ_DUPLICATE_SREJ; 46464b51dae9SMat Martineau } 46474b51dae9SMat Martineau 46484b51dae9SMat Martineau if (l2cap_seq_list_contains(&chan->srej_list, txseq)) { 46494b51dae9SMat Martineau BT_DBG("Unexpected SREJ - not requested"); 46504b51dae9SMat Martineau return L2CAP_TXSEQ_UNEXPECTED_SREJ; 46514b51dae9SMat Martineau } 46524b51dae9SMat Martineau } 46534b51dae9SMat Martineau 46544b51dae9SMat Martineau if (chan->expected_tx_seq == txseq) { 46554b51dae9SMat Martineau if (__seq_offset(chan, txseq, chan->last_acked_seq) >= 46564b51dae9SMat Martineau chan->tx_win) { 46574b51dae9SMat Martineau BT_DBG("Invalid - txseq outside tx window"); 46584b51dae9SMat Martineau return L2CAP_TXSEQ_INVALID; 46594b51dae9SMat Martineau } else { 46604b51dae9SMat Martineau BT_DBG("Expected"); 46614b51dae9SMat Martineau return L2CAP_TXSEQ_EXPECTED; 46624b51dae9SMat Martineau } 46634b51dae9SMat Martineau } 46644b51dae9SMat Martineau 46654b51dae9SMat Martineau if (__seq_offset(chan, txseq, chan->last_acked_seq) < 46664b51dae9SMat Martineau __seq_offset(chan, chan->expected_tx_seq, 46674b51dae9SMat Martineau chan->last_acked_seq)){ 46684b51dae9SMat Martineau BT_DBG("Duplicate - expected_tx_seq later than txseq"); 46694b51dae9SMat Martineau return L2CAP_TXSEQ_DUPLICATE; 46704b51dae9SMat Martineau } 46714b51dae9SMat Martineau 46724b51dae9SMat Martineau if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) { 46734b51dae9SMat Martineau /* A source of invalid packets is a "double poll" condition, 46744b51dae9SMat Martineau * where delays cause us to send multiple poll packets. If 46754b51dae9SMat Martineau * the remote stack receives and processes both polls, 46764b51dae9SMat Martineau * sequence numbers can wrap around in such a way that a 46774b51dae9SMat Martineau * resent frame has a sequence number that looks like new data 46784b51dae9SMat Martineau * with a sequence gap. This would trigger an erroneous SREJ 46794b51dae9SMat Martineau * request. 46804b51dae9SMat Martineau * 46814b51dae9SMat Martineau * Fortunately, this is impossible with a tx window that's 46824b51dae9SMat Martineau * less than half of the maximum sequence number, which allows 46834b51dae9SMat Martineau * invalid frames to be safely ignored. 46844b51dae9SMat Martineau * 46854b51dae9SMat Martineau * With tx window sizes greater than half of the tx window 46864b51dae9SMat Martineau * maximum, the frame is invalid and cannot be ignored. This 46874b51dae9SMat Martineau * causes a disconnect. 46884b51dae9SMat Martineau */ 46894b51dae9SMat Martineau 46904b51dae9SMat Martineau if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { 46914b51dae9SMat Martineau BT_DBG("Invalid/Ignore - txseq outside tx window"); 46924b51dae9SMat Martineau return L2CAP_TXSEQ_INVALID_IGNORE; 46934b51dae9SMat Martineau } else { 46944b51dae9SMat Martineau BT_DBG("Invalid - txseq outside tx window"); 46954b51dae9SMat Martineau return L2CAP_TXSEQ_INVALID; 46964b51dae9SMat Martineau } 46974b51dae9SMat Martineau } else { 46984b51dae9SMat Martineau BT_DBG("Unexpected - txseq indicates missing frames"); 46994b51dae9SMat Martineau return L2CAP_TXSEQ_UNEXPECTED; 47004b51dae9SMat Martineau } 47014b51dae9SMat Martineau } 47024b51dae9SMat Martineau 4703d2a7ac5dSMat Martineau static int l2cap_rx_state_recv(struct l2cap_chan *chan, 4704d2a7ac5dSMat Martineau struct l2cap_ctrl *control, 4705d2a7ac5dSMat Martineau struct sk_buff *skb, u8 event) 4706d2a7ac5dSMat Martineau { 4707d2a7ac5dSMat Martineau int err = 0; 4708d2a7ac5dSMat Martineau bool skb_in_use = 0; 4709d2a7ac5dSMat Martineau 4710d2a7ac5dSMat Martineau BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, 4711d2a7ac5dSMat Martineau event); 4712d2a7ac5dSMat Martineau 4713d2a7ac5dSMat Martineau switch (event) { 4714d2a7ac5dSMat Martineau case L2CAP_EV_RECV_IFRAME: 4715d2a7ac5dSMat Martineau switch (l2cap_classify_txseq(chan, control->txseq)) { 4716d2a7ac5dSMat Martineau case L2CAP_TXSEQ_EXPECTED: 4717d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 4718d2a7ac5dSMat Martineau 4719d2a7ac5dSMat Martineau if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { 4720d2a7ac5dSMat Martineau BT_DBG("Busy, discarding expected seq %d", 4721d2a7ac5dSMat Martineau control->txseq); 4722d2a7ac5dSMat Martineau break; 4723d2a7ac5dSMat Martineau } 4724d2a7ac5dSMat Martineau 4725d2a7ac5dSMat Martineau chan->expected_tx_seq = __next_seq(chan, 4726d2a7ac5dSMat Martineau control->txseq); 4727d2a7ac5dSMat Martineau 4728d2a7ac5dSMat Martineau chan->buffer_seq = chan->expected_tx_seq; 4729d2a7ac5dSMat Martineau skb_in_use = 1; 4730d2a7ac5dSMat Martineau 4731d2a7ac5dSMat Martineau err = l2cap_reassemble_sdu(chan, skb, control); 4732d2a7ac5dSMat Martineau if (err) 4733d2a7ac5dSMat Martineau break; 4734d2a7ac5dSMat Martineau 4735d2a7ac5dSMat Martineau if (control->final) { 4736d2a7ac5dSMat Martineau if (!test_and_clear_bit(CONN_REJ_ACT, 4737d2a7ac5dSMat Martineau &chan->conn_state)) { 4738d2a7ac5dSMat Martineau control->final = 0; 4739d2a7ac5dSMat Martineau l2cap_retransmit_all(chan, control); 4740d2a7ac5dSMat Martineau l2cap_ertm_send(chan); 4741d2a7ac5dSMat Martineau } 4742d2a7ac5dSMat Martineau } 4743d2a7ac5dSMat Martineau 4744d2a7ac5dSMat Martineau if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) 4745d2a7ac5dSMat Martineau l2cap_send_ack(chan); 4746d2a7ac5dSMat Martineau break; 4747d2a7ac5dSMat Martineau case L2CAP_TXSEQ_UNEXPECTED: 4748d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 4749d2a7ac5dSMat Martineau 4750d2a7ac5dSMat Martineau /* Can't issue SREJ frames in the local busy state. 4751d2a7ac5dSMat Martineau * Drop this frame, it will be seen as missing 4752d2a7ac5dSMat Martineau * when local busy is exited. 4753d2a7ac5dSMat Martineau */ 4754d2a7ac5dSMat Martineau if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { 4755d2a7ac5dSMat Martineau BT_DBG("Busy, discarding unexpected seq %d", 4756d2a7ac5dSMat Martineau control->txseq); 4757d2a7ac5dSMat Martineau break; 4758d2a7ac5dSMat Martineau } 4759d2a7ac5dSMat Martineau 4760d2a7ac5dSMat Martineau /* There was a gap in the sequence, so an SREJ 4761d2a7ac5dSMat Martineau * must be sent for each missing frame. The 4762d2a7ac5dSMat Martineau * current frame is stored for later use. 4763d2a7ac5dSMat Martineau */ 4764d2a7ac5dSMat Martineau skb_queue_tail(&chan->srej_q, skb); 4765d2a7ac5dSMat Martineau skb_in_use = 1; 4766d2a7ac5dSMat Martineau BT_DBG("Queued %p (queue len %d)", skb, 4767d2a7ac5dSMat Martineau skb_queue_len(&chan->srej_q)); 4768d2a7ac5dSMat Martineau 4769d2a7ac5dSMat Martineau clear_bit(CONN_SREJ_ACT, &chan->conn_state); 4770d2a7ac5dSMat Martineau l2cap_seq_list_clear(&chan->srej_list); 4771d2a7ac5dSMat Martineau l2cap_send_srej(chan, control->txseq); 4772d2a7ac5dSMat Martineau 4773d2a7ac5dSMat Martineau chan->rx_state = L2CAP_RX_STATE_SREJ_SENT; 4774d2a7ac5dSMat Martineau break; 4775d2a7ac5dSMat Martineau case L2CAP_TXSEQ_DUPLICATE: 4776d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 4777d2a7ac5dSMat Martineau break; 4778d2a7ac5dSMat Martineau case L2CAP_TXSEQ_INVALID_IGNORE: 4779d2a7ac5dSMat Martineau break; 4780d2a7ac5dSMat Martineau case L2CAP_TXSEQ_INVALID: 4781d2a7ac5dSMat Martineau default: 4782d2a7ac5dSMat Martineau l2cap_send_disconn_req(chan->conn, chan, 4783d2a7ac5dSMat Martineau ECONNRESET); 4784d2a7ac5dSMat Martineau break; 4785d2a7ac5dSMat Martineau } 4786d2a7ac5dSMat Martineau break; 4787d2a7ac5dSMat Martineau case L2CAP_EV_RECV_RR: 4788d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 4789d2a7ac5dSMat Martineau if (control->final) { 4790d2a7ac5dSMat Martineau clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); 4791d2a7ac5dSMat Martineau 4792d2a7ac5dSMat Martineau if (!test_and_clear_bit(CONN_REJ_ACT, 4793d2a7ac5dSMat Martineau &chan->conn_state)) { 4794d2a7ac5dSMat Martineau control->final = 0; 4795d2a7ac5dSMat Martineau l2cap_retransmit_all(chan, control); 4796d2a7ac5dSMat Martineau } 4797d2a7ac5dSMat Martineau 4798d2a7ac5dSMat Martineau l2cap_ertm_send(chan); 4799d2a7ac5dSMat Martineau } else if (control->poll) { 4800d2a7ac5dSMat Martineau l2cap_send_i_or_rr_or_rnr(chan); 4801d2a7ac5dSMat Martineau } else { 4802d2a7ac5dSMat Martineau if (test_and_clear_bit(CONN_REMOTE_BUSY, 4803d2a7ac5dSMat Martineau &chan->conn_state) && 4804d2a7ac5dSMat Martineau chan->unacked_frames) 4805d2a7ac5dSMat Martineau __set_retrans_timer(chan); 4806d2a7ac5dSMat Martineau 4807d2a7ac5dSMat Martineau l2cap_ertm_send(chan); 4808d2a7ac5dSMat Martineau } 4809d2a7ac5dSMat Martineau break; 4810d2a7ac5dSMat Martineau case L2CAP_EV_RECV_RNR: 4811d2a7ac5dSMat Martineau set_bit(CONN_REMOTE_BUSY, &chan->conn_state); 4812d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 4813d2a7ac5dSMat Martineau if (control && control->poll) { 4814d2a7ac5dSMat Martineau set_bit(CONN_SEND_FBIT, &chan->conn_state); 4815d2a7ac5dSMat Martineau l2cap_send_rr_or_rnr(chan, 0); 4816d2a7ac5dSMat Martineau } 4817d2a7ac5dSMat Martineau __clear_retrans_timer(chan); 4818d2a7ac5dSMat Martineau l2cap_seq_list_clear(&chan->retrans_list); 4819d2a7ac5dSMat Martineau break; 4820d2a7ac5dSMat Martineau case L2CAP_EV_RECV_REJ: 4821d2a7ac5dSMat Martineau l2cap_handle_rej(chan, control); 4822d2a7ac5dSMat Martineau break; 4823d2a7ac5dSMat Martineau case L2CAP_EV_RECV_SREJ: 4824d2a7ac5dSMat Martineau l2cap_handle_srej(chan, control); 4825d2a7ac5dSMat Martineau break; 4826d2a7ac5dSMat Martineau default: 4827d2a7ac5dSMat Martineau break; 4828d2a7ac5dSMat Martineau } 4829d2a7ac5dSMat Martineau 4830d2a7ac5dSMat Martineau if (skb && !skb_in_use) { 4831d2a7ac5dSMat Martineau BT_DBG("Freeing %p", skb); 4832d2a7ac5dSMat Martineau kfree_skb(skb); 4833d2a7ac5dSMat Martineau } 4834d2a7ac5dSMat Martineau 4835d2a7ac5dSMat Martineau return err; 4836d2a7ac5dSMat Martineau } 4837d2a7ac5dSMat Martineau 4838d2a7ac5dSMat Martineau static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan, 4839d2a7ac5dSMat Martineau struct l2cap_ctrl *control, 4840d2a7ac5dSMat Martineau struct sk_buff *skb, u8 event) 4841d2a7ac5dSMat Martineau { 4842d2a7ac5dSMat Martineau int err = 0; 4843d2a7ac5dSMat Martineau u16 txseq = control->txseq; 4844d2a7ac5dSMat Martineau bool skb_in_use = 0; 4845d2a7ac5dSMat Martineau 4846d2a7ac5dSMat Martineau BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, 4847d2a7ac5dSMat Martineau event); 4848d2a7ac5dSMat Martineau 4849d2a7ac5dSMat Martineau switch (event) { 4850d2a7ac5dSMat Martineau case L2CAP_EV_RECV_IFRAME: 4851d2a7ac5dSMat Martineau switch (l2cap_classify_txseq(chan, txseq)) { 4852d2a7ac5dSMat Martineau case L2CAP_TXSEQ_EXPECTED: 4853d2a7ac5dSMat Martineau /* Keep frame for reassembly later */ 4854d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 4855d2a7ac5dSMat Martineau skb_queue_tail(&chan->srej_q, skb); 4856d2a7ac5dSMat Martineau skb_in_use = 1; 4857d2a7ac5dSMat Martineau BT_DBG("Queued %p (queue len %d)", skb, 4858d2a7ac5dSMat Martineau skb_queue_len(&chan->srej_q)); 4859d2a7ac5dSMat Martineau 4860d2a7ac5dSMat Martineau chan->expected_tx_seq = __next_seq(chan, txseq); 4861d2a7ac5dSMat Martineau break; 4862d2a7ac5dSMat Martineau case L2CAP_TXSEQ_EXPECTED_SREJ: 4863d2a7ac5dSMat Martineau l2cap_seq_list_pop(&chan->srej_list); 4864d2a7ac5dSMat Martineau 4865d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 4866d2a7ac5dSMat Martineau skb_queue_tail(&chan->srej_q, skb); 4867d2a7ac5dSMat Martineau skb_in_use = 1; 4868d2a7ac5dSMat Martineau BT_DBG("Queued %p (queue len %d)", skb, 4869d2a7ac5dSMat Martineau skb_queue_len(&chan->srej_q)); 4870d2a7ac5dSMat Martineau 4871d2a7ac5dSMat Martineau err = l2cap_rx_queued_iframes(chan); 4872d2a7ac5dSMat Martineau if (err) 4873d2a7ac5dSMat Martineau break; 4874d2a7ac5dSMat Martineau 4875d2a7ac5dSMat Martineau break; 4876d2a7ac5dSMat Martineau case L2CAP_TXSEQ_UNEXPECTED: 4877d2a7ac5dSMat Martineau /* Got a frame that can't be reassembled yet. 4878d2a7ac5dSMat Martineau * Save it for later, and send SREJs to cover 4879d2a7ac5dSMat Martineau * the missing frames. 4880d2a7ac5dSMat Martineau */ 4881d2a7ac5dSMat Martineau skb_queue_tail(&chan->srej_q, skb); 4882d2a7ac5dSMat Martineau skb_in_use = 1; 4883d2a7ac5dSMat Martineau BT_DBG("Queued %p (queue len %d)", skb, 4884d2a7ac5dSMat Martineau skb_queue_len(&chan->srej_q)); 4885d2a7ac5dSMat Martineau 4886d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 4887d2a7ac5dSMat Martineau l2cap_send_srej(chan, control->txseq); 4888d2a7ac5dSMat Martineau break; 4889d2a7ac5dSMat Martineau case L2CAP_TXSEQ_UNEXPECTED_SREJ: 4890d2a7ac5dSMat Martineau /* This frame was requested with an SREJ, but 4891d2a7ac5dSMat Martineau * some expected retransmitted frames are 4892d2a7ac5dSMat Martineau * missing. Request retransmission of missing 4893d2a7ac5dSMat Martineau * SREJ'd frames. 4894d2a7ac5dSMat Martineau */ 4895d2a7ac5dSMat Martineau skb_queue_tail(&chan->srej_q, skb); 4896d2a7ac5dSMat Martineau skb_in_use = 1; 4897d2a7ac5dSMat Martineau BT_DBG("Queued %p (queue len %d)", skb, 4898d2a7ac5dSMat Martineau skb_queue_len(&chan->srej_q)); 4899d2a7ac5dSMat Martineau 4900d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 4901d2a7ac5dSMat Martineau l2cap_send_srej_list(chan, control->txseq); 4902d2a7ac5dSMat Martineau break; 4903d2a7ac5dSMat Martineau case L2CAP_TXSEQ_DUPLICATE_SREJ: 4904d2a7ac5dSMat Martineau /* We've already queued this frame. Drop this copy. */ 4905d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 4906d2a7ac5dSMat Martineau break; 4907d2a7ac5dSMat Martineau case L2CAP_TXSEQ_DUPLICATE: 4908d2a7ac5dSMat Martineau /* Expecting a later sequence number, so this frame 4909d2a7ac5dSMat Martineau * was already received. Ignore it completely. 4910d2a7ac5dSMat Martineau */ 4911d2a7ac5dSMat Martineau break; 4912d2a7ac5dSMat Martineau case L2CAP_TXSEQ_INVALID_IGNORE: 4913d2a7ac5dSMat Martineau break; 4914d2a7ac5dSMat Martineau case L2CAP_TXSEQ_INVALID: 4915d2a7ac5dSMat Martineau default: 4916d2a7ac5dSMat Martineau l2cap_send_disconn_req(chan->conn, chan, 4917d2a7ac5dSMat Martineau ECONNRESET); 4918d2a7ac5dSMat Martineau break; 4919d2a7ac5dSMat Martineau } 4920d2a7ac5dSMat Martineau break; 4921d2a7ac5dSMat Martineau case L2CAP_EV_RECV_RR: 4922d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 4923d2a7ac5dSMat Martineau if (control->final) { 4924d2a7ac5dSMat Martineau clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); 4925d2a7ac5dSMat Martineau 4926d2a7ac5dSMat Martineau if (!test_and_clear_bit(CONN_REJ_ACT, 4927d2a7ac5dSMat Martineau &chan->conn_state)) { 4928d2a7ac5dSMat Martineau control->final = 0; 4929d2a7ac5dSMat Martineau l2cap_retransmit_all(chan, control); 4930d2a7ac5dSMat Martineau } 4931d2a7ac5dSMat Martineau 4932d2a7ac5dSMat Martineau l2cap_ertm_send(chan); 4933d2a7ac5dSMat Martineau } else if (control->poll) { 4934d2a7ac5dSMat Martineau if (test_and_clear_bit(CONN_REMOTE_BUSY, 4935d2a7ac5dSMat Martineau &chan->conn_state) && 4936d2a7ac5dSMat Martineau chan->unacked_frames) { 4937d2a7ac5dSMat Martineau __set_retrans_timer(chan); 4938d2a7ac5dSMat Martineau } 4939d2a7ac5dSMat Martineau 4940d2a7ac5dSMat Martineau set_bit(CONN_SEND_FBIT, &chan->conn_state); 4941d2a7ac5dSMat Martineau l2cap_send_srej_tail(chan); 4942d2a7ac5dSMat Martineau } else { 4943d2a7ac5dSMat Martineau if (test_and_clear_bit(CONN_REMOTE_BUSY, 4944d2a7ac5dSMat Martineau &chan->conn_state) && 4945d2a7ac5dSMat Martineau chan->unacked_frames) 4946d2a7ac5dSMat Martineau __set_retrans_timer(chan); 4947d2a7ac5dSMat Martineau 4948d2a7ac5dSMat Martineau l2cap_send_ack(chan); 4949d2a7ac5dSMat Martineau } 4950d2a7ac5dSMat Martineau break; 4951d2a7ac5dSMat Martineau case L2CAP_EV_RECV_RNR: 4952d2a7ac5dSMat Martineau set_bit(CONN_REMOTE_BUSY, &chan->conn_state); 4953d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 4954d2a7ac5dSMat Martineau if (control->poll) { 4955d2a7ac5dSMat Martineau l2cap_send_srej_tail(chan); 4956d2a7ac5dSMat Martineau } else { 4957d2a7ac5dSMat Martineau struct l2cap_ctrl rr_control; 4958d2a7ac5dSMat Martineau memset(&rr_control, 0, sizeof(rr_control)); 4959d2a7ac5dSMat Martineau rr_control.sframe = 1; 4960d2a7ac5dSMat Martineau rr_control.super = L2CAP_SUPER_RR; 4961d2a7ac5dSMat Martineau rr_control.reqseq = chan->buffer_seq; 4962d2a7ac5dSMat Martineau l2cap_send_sframe(chan, &rr_control); 4963d2a7ac5dSMat Martineau } 4964d2a7ac5dSMat Martineau 4965d2a7ac5dSMat Martineau break; 4966d2a7ac5dSMat Martineau case L2CAP_EV_RECV_REJ: 4967d2a7ac5dSMat Martineau l2cap_handle_rej(chan, control); 4968d2a7ac5dSMat Martineau break; 4969d2a7ac5dSMat Martineau case L2CAP_EV_RECV_SREJ: 4970d2a7ac5dSMat Martineau l2cap_handle_srej(chan, control); 4971d2a7ac5dSMat Martineau break; 4972d2a7ac5dSMat Martineau } 4973d2a7ac5dSMat Martineau 4974d2a7ac5dSMat Martineau if (skb && !skb_in_use) { 4975d2a7ac5dSMat Martineau BT_DBG("Freeing %p", skb); 4976d2a7ac5dSMat Martineau kfree_skb(skb); 4977d2a7ac5dSMat Martineau } 4978d2a7ac5dSMat Martineau 4979d2a7ac5dSMat Martineau return err; 4980d2a7ac5dSMat Martineau } 4981d2a7ac5dSMat Martineau 4982d2a7ac5dSMat Martineau static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq) 4983d2a7ac5dSMat Martineau { 4984d2a7ac5dSMat Martineau /* Make sure reqseq is for a packet that has been sent but not acked */ 4985d2a7ac5dSMat Martineau u16 unacked; 4986d2a7ac5dSMat Martineau 4987d2a7ac5dSMat Martineau unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq); 4988d2a7ac5dSMat Martineau return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked; 4989d2a7ac5dSMat Martineau } 4990d2a7ac5dSMat Martineau 4991cec8ab6eSMat Martineau static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, 4992cec8ab6eSMat Martineau struct sk_buff *skb, u8 event) 49930a708f8fSGustavo F. Padovan { 4994d2a7ac5dSMat Martineau int err = 0; 4995d2a7ac5dSMat Martineau 4996d2a7ac5dSMat Martineau BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan, 4997d2a7ac5dSMat Martineau control, skb, event, chan->rx_state); 4998d2a7ac5dSMat Martineau 4999d2a7ac5dSMat Martineau if (__valid_reqseq(chan, control->reqseq)) { 5000d2a7ac5dSMat Martineau switch (chan->rx_state) { 5001d2a7ac5dSMat Martineau case L2CAP_RX_STATE_RECV: 5002d2a7ac5dSMat Martineau err = l2cap_rx_state_recv(chan, control, skb, event); 5003d2a7ac5dSMat Martineau break; 5004d2a7ac5dSMat Martineau case L2CAP_RX_STATE_SREJ_SENT: 5005d2a7ac5dSMat Martineau err = l2cap_rx_state_srej_sent(chan, control, skb, 5006d2a7ac5dSMat Martineau event); 5007d2a7ac5dSMat Martineau break; 5008d2a7ac5dSMat Martineau default: 5009d2a7ac5dSMat Martineau /* shut it down */ 5010d2a7ac5dSMat Martineau break; 5011d2a7ac5dSMat Martineau } 5012d2a7ac5dSMat Martineau } else { 5013d2a7ac5dSMat Martineau BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d", 5014d2a7ac5dSMat Martineau control->reqseq, chan->next_tx_seq, 5015d2a7ac5dSMat Martineau chan->expected_ack_seq); 5016d2a7ac5dSMat Martineau l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); 5017d2a7ac5dSMat Martineau } 5018d2a7ac5dSMat Martineau 5019d2a7ac5dSMat Martineau return err; 5020cec8ab6eSMat Martineau } 5021cec8ab6eSMat Martineau 5022cec8ab6eSMat Martineau static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, 5023cec8ab6eSMat Martineau struct sk_buff *skb) 5024cec8ab6eSMat Martineau { 50254b51dae9SMat Martineau int err = 0; 50264b51dae9SMat Martineau 50274b51dae9SMat Martineau BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb, 50284b51dae9SMat Martineau chan->rx_state); 50294b51dae9SMat Martineau 50304b51dae9SMat Martineau if (l2cap_classify_txseq(chan, control->txseq) == 50314b51dae9SMat Martineau L2CAP_TXSEQ_EXPECTED) { 50324b51dae9SMat Martineau l2cap_pass_to_tx(chan, control); 50334b51dae9SMat Martineau 50344b51dae9SMat Martineau BT_DBG("buffer_seq %d->%d", chan->buffer_seq, 50354b51dae9SMat Martineau __next_seq(chan, chan->buffer_seq)); 50364b51dae9SMat Martineau 50374b51dae9SMat Martineau chan->buffer_seq = __next_seq(chan, chan->buffer_seq); 50384b51dae9SMat Martineau 50394b51dae9SMat Martineau l2cap_reassemble_sdu(chan, skb, control); 50404b51dae9SMat Martineau } else { 50414b51dae9SMat Martineau if (chan->sdu) { 50424b51dae9SMat Martineau kfree_skb(chan->sdu); 50434b51dae9SMat Martineau chan->sdu = NULL; 50444b51dae9SMat Martineau } 50454b51dae9SMat Martineau chan->sdu_last_frag = NULL; 50464b51dae9SMat Martineau chan->sdu_len = 0; 50474b51dae9SMat Martineau 50484b51dae9SMat Martineau if (skb) { 50494b51dae9SMat Martineau BT_DBG("Freeing %p", skb); 50504b51dae9SMat Martineau kfree_skb(skb); 50514b51dae9SMat Martineau } 50524b51dae9SMat Martineau } 50534b51dae9SMat Martineau 50544b51dae9SMat Martineau chan->last_acked_seq = control->txseq; 50554b51dae9SMat Martineau chan->expected_tx_seq = __next_seq(chan, control->txseq); 50564b51dae9SMat Martineau 50574b51dae9SMat Martineau return err; 5058cec8ab6eSMat Martineau } 5059cec8ab6eSMat Martineau 5060cec8ab6eSMat Martineau static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) 5061cec8ab6eSMat Martineau { 5062cec8ab6eSMat Martineau struct l2cap_ctrl *control = &bt_cb(skb)->control; 5063cec8ab6eSMat Martineau u16 len; 5064cec8ab6eSMat Martineau u8 event; 50650a708f8fSGustavo F. Padovan 5066b76bbd66SMat Martineau __unpack_control(chan, skb); 5067b76bbd66SMat Martineau 50680a708f8fSGustavo F. Padovan len = skb->len; 50690a708f8fSGustavo F. Padovan 50700a708f8fSGustavo F. Padovan /* 50710a708f8fSGustavo F. Padovan * We can just drop the corrupted I-frame here. 50720a708f8fSGustavo F. Padovan * Receiver will miss it and start proper recovery 5073cec8ab6eSMat Martineau * procedures and ask for retransmission. 50740a708f8fSGustavo F. Padovan */ 507547d1ec61SGustavo F. Padovan if (l2cap_check_fcs(chan, skb)) 50760a708f8fSGustavo F. Padovan goto drop; 50770a708f8fSGustavo F. Padovan 5078cec8ab6eSMat Martineau if (!control->sframe && control->sar == L2CAP_SAR_START) 507903a51213SAndrei Emeltchenko len -= L2CAP_SDULEN_SIZE; 50800a708f8fSGustavo F. Padovan 508147d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) 508203a51213SAndrei Emeltchenko len -= L2CAP_FCS_SIZE; 50830a708f8fSGustavo F. Padovan 508447d1ec61SGustavo F. Padovan if (len > chan->mps) { 50858c1d787bSGustavo F. Padovan l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); 50860a708f8fSGustavo F. Padovan goto drop; 50870a708f8fSGustavo F. Padovan } 50880a708f8fSGustavo F. Padovan 5089cec8ab6eSMat Martineau if (!control->sframe) { 5090cec8ab6eSMat Martineau int err; 50910a708f8fSGustavo F. Padovan 5092cec8ab6eSMat Martineau BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d", 5093cec8ab6eSMat Martineau control->sar, control->reqseq, control->final, 5094cec8ab6eSMat Martineau control->txseq); 5095836be934SAndrei Emeltchenko 5096cec8ab6eSMat Martineau /* Validate F-bit - F=0 always valid, F=1 only 5097cec8ab6eSMat Martineau * valid in TX WAIT_F 5098cec8ab6eSMat Martineau */ 5099cec8ab6eSMat Martineau if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F) 51000a708f8fSGustavo F. Padovan goto drop; 51010a708f8fSGustavo F. Padovan 5102cec8ab6eSMat Martineau if (chan->mode != L2CAP_MODE_STREAMING) { 5103cec8ab6eSMat Martineau event = L2CAP_EV_RECV_IFRAME; 5104cec8ab6eSMat Martineau err = l2cap_rx(chan, control, skb, event); 51050a708f8fSGustavo F. Padovan } else { 5106cec8ab6eSMat Martineau err = l2cap_stream_rx(chan, control, skb); 5107cec8ab6eSMat Martineau } 5108cec8ab6eSMat Martineau 5109cec8ab6eSMat Martineau if (err) 5110cec8ab6eSMat Martineau l2cap_send_disconn_req(chan->conn, chan, 5111cec8ab6eSMat Martineau ECONNRESET); 5112cec8ab6eSMat Martineau } else { 5113cec8ab6eSMat Martineau const u8 rx_func_to_event[4] = { 5114cec8ab6eSMat Martineau L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ, 5115cec8ab6eSMat Martineau L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ 5116cec8ab6eSMat Martineau }; 5117cec8ab6eSMat Martineau 5118cec8ab6eSMat Martineau /* Only I-frames are expected in streaming mode */ 5119cec8ab6eSMat Martineau if (chan->mode == L2CAP_MODE_STREAMING) 5120cec8ab6eSMat Martineau goto drop; 5121cec8ab6eSMat Martineau 5122cec8ab6eSMat Martineau BT_DBG("sframe reqseq %d, final %d, poll %d, super %d", 5123cec8ab6eSMat Martineau control->reqseq, control->final, control->poll, 5124cec8ab6eSMat Martineau control->super); 5125cec8ab6eSMat Martineau 51260a708f8fSGustavo F. Padovan if (len != 0) { 51270a708f8fSGustavo F. Padovan BT_ERR("%d", len); 51288c1d787bSGustavo F. Padovan l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); 51290a708f8fSGustavo F. Padovan goto drop; 51300a708f8fSGustavo F. Padovan } 51310a708f8fSGustavo F. Padovan 5132cec8ab6eSMat Martineau /* Validate F and P bits */ 5133cec8ab6eSMat Martineau if (control->final && (control->poll || 5134cec8ab6eSMat Martineau chan->tx_state != L2CAP_TX_STATE_WAIT_F)) 5135cec8ab6eSMat Martineau goto drop; 5136cec8ab6eSMat Martineau 5137cec8ab6eSMat Martineau event = rx_func_to_event[control->super]; 5138cec8ab6eSMat Martineau if (l2cap_rx(chan, control, skb, event)) 5139cec8ab6eSMat Martineau l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); 51400a708f8fSGustavo F. Padovan } 51410a708f8fSGustavo F. Padovan 51420a708f8fSGustavo F. Padovan return 0; 51430a708f8fSGustavo F. Padovan 51440a708f8fSGustavo F. Padovan drop: 51450a708f8fSGustavo F. Padovan kfree_skb(skb); 51460a708f8fSGustavo F. Padovan return 0; 51470a708f8fSGustavo F. Padovan } 51480a708f8fSGustavo F. Padovan 514913ca56e0SAndrei Emeltchenko static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid, 515013ca56e0SAndrei Emeltchenko struct sk_buff *skb) 51510a708f8fSGustavo F. Padovan { 515248454079SGustavo F. Padovan struct l2cap_chan *chan; 51530a708f8fSGustavo F. Padovan 5154baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, cid); 515548454079SGustavo F. Padovan if (!chan) { 515697e8e89dSAndrei Emeltchenko if (cid == L2CAP_CID_A2MP) { 515797e8e89dSAndrei Emeltchenko chan = a2mp_channel_create(conn, skb); 515897e8e89dSAndrei Emeltchenko if (!chan) { 515997e8e89dSAndrei Emeltchenko kfree_skb(skb); 516013ca56e0SAndrei Emeltchenko return; 516197e8e89dSAndrei Emeltchenko } 516297e8e89dSAndrei Emeltchenko 516397e8e89dSAndrei Emeltchenko l2cap_chan_lock(chan); 516497e8e89dSAndrei Emeltchenko } else { 51650a708f8fSGustavo F. Padovan BT_DBG("unknown cid 0x%4.4x", cid); 51666be36555SAndrei Emeltchenko /* Drop packet and return */ 51673379013bSDan Carpenter kfree_skb(skb); 516813ca56e0SAndrei Emeltchenko return; 51690a708f8fSGustavo F. Padovan } 517097e8e89dSAndrei Emeltchenko } 51710a708f8fSGustavo F. Padovan 517249208c9cSGustavo F. Padovan BT_DBG("chan %p, len %d", chan, skb->len); 51730a708f8fSGustavo F. Padovan 517489bc500eSGustavo F. Padovan if (chan->state != BT_CONNECTED) 51750a708f8fSGustavo F. Padovan goto drop; 51760a708f8fSGustavo F. Padovan 51770c1bc5c6SGustavo F. Padovan switch (chan->mode) { 51780a708f8fSGustavo F. Padovan case L2CAP_MODE_BASIC: 51790a708f8fSGustavo F. Padovan /* If socket recv buffers overflows we drop data here 51800a708f8fSGustavo F. Padovan * which is *bad* because L2CAP has to be reliable. 51810a708f8fSGustavo F. Padovan * But we don't have any other choice. L2CAP doesn't 51820a708f8fSGustavo F. Padovan * provide flow control mechanism. */ 51830a708f8fSGustavo F. Padovan 51840c1bc5c6SGustavo F. Padovan if (chan->imtu < skb->len) 51850a708f8fSGustavo F. Padovan goto drop; 51860a708f8fSGustavo F. Padovan 518780b98027SGustavo Padovan if (!chan->ops->recv(chan, skb)) 51880a708f8fSGustavo F. Padovan goto done; 51890a708f8fSGustavo F. Padovan break; 51900a708f8fSGustavo F. Padovan 51910a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 51920a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 5193cec8ab6eSMat Martineau l2cap_data_rcv(chan, skb); 51940a708f8fSGustavo F. Padovan goto done; 51950a708f8fSGustavo F. Padovan 51960a708f8fSGustavo F. Padovan default: 51970c1bc5c6SGustavo F. Padovan BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode); 51980a708f8fSGustavo F. Padovan break; 51990a708f8fSGustavo F. Padovan } 52000a708f8fSGustavo F. Padovan 52010a708f8fSGustavo F. Padovan drop: 52020a708f8fSGustavo F. Padovan kfree_skb(skb); 52030a708f8fSGustavo F. Padovan 52040a708f8fSGustavo F. Padovan done: 52056be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 52060a708f8fSGustavo F. Padovan } 52070a708f8fSGustavo F. Padovan 520884104b24SAndrei Emeltchenko static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, 520984104b24SAndrei Emeltchenko struct sk_buff *skb) 52100a708f8fSGustavo F. Padovan { 521123691d75SGustavo F. Padovan struct l2cap_chan *chan; 52120a708f8fSGustavo F. Padovan 5213c2287681SIdo Yariv chan = l2cap_global_chan_by_psm(0, psm, conn->src, conn->dst); 521423691d75SGustavo F. Padovan if (!chan) 52150a708f8fSGustavo F. Padovan goto drop; 52160a708f8fSGustavo F. Padovan 52175b4cedaaSAndrei Emeltchenko BT_DBG("chan %p, len %d", chan, skb->len); 52180a708f8fSGustavo F. Padovan 521989bc500eSGustavo F. Padovan if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) 52200a708f8fSGustavo F. Padovan goto drop; 52210a708f8fSGustavo F. Padovan 5222e13e21dcSVinicius Costa Gomes if (chan->imtu < skb->len) 52230a708f8fSGustavo F. Padovan goto drop; 52240a708f8fSGustavo F. Padovan 522580b98027SGustavo Padovan if (!chan->ops->recv(chan, skb)) 522684104b24SAndrei Emeltchenko return; 52270a708f8fSGustavo F. Padovan 52280a708f8fSGustavo F. Padovan drop: 52290a708f8fSGustavo F. Padovan kfree_skb(skb); 52300a708f8fSGustavo F. Padovan } 52310a708f8fSGustavo F. Padovan 52326810fca7SAndrei Emeltchenko static void l2cap_att_channel(struct l2cap_conn *conn, u16 cid, 5233d9b88702SAndrei Emeltchenko struct sk_buff *skb) 52349f69bda6SGustavo F. Padovan { 523523691d75SGustavo F. Padovan struct l2cap_chan *chan; 52369f69bda6SGustavo F. Padovan 5237c2287681SIdo Yariv chan = l2cap_global_chan_by_scid(0, cid, conn->src, conn->dst); 523823691d75SGustavo F. Padovan if (!chan) 52399f69bda6SGustavo F. Padovan goto drop; 52409f69bda6SGustavo F. Padovan 52415b4cedaaSAndrei Emeltchenko BT_DBG("chan %p, len %d", chan, skb->len); 52429f69bda6SGustavo F. Padovan 524389bc500eSGustavo F. Padovan if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) 52449f69bda6SGustavo F. Padovan goto drop; 52459f69bda6SGustavo F. Padovan 5246e13e21dcSVinicius Costa Gomes if (chan->imtu < skb->len) 52479f69bda6SGustavo F. Padovan goto drop; 52489f69bda6SGustavo F. Padovan 524980b98027SGustavo Padovan if (!chan->ops->recv(chan, skb)) 52506810fca7SAndrei Emeltchenko return; 52519f69bda6SGustavo F. Padovan 52529f69bda6SGustavo F. Padovan drop: 52539f69bda6SGustavo F. Padovan kfree_skb(skb); 52549f69bda6SGustavo F. Padovan } 52559f69bda6SGustavo F. Padovan 52560a708f8fSGustavo F. Padovan static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) 52570a708f8fSGustavo F. Padovan { 52580a708f8fSGustavo F. Padovan struct l2cap_hdr *lh = (void *) skb->data; 52590a708f8fSGustavo F. Padovan u16 cid, len; 52600a708f8fSGustavo F. Padovan __le16 psm; 52610a708f8fSGustavo F. Padovan 52620a708f8fSGustavo F. Padovan skb_pull(skb, L2CAP_HDR_SIZE); 52630a708f8fSGustavo F. Padovan cid = __le16_to_cpu(lh->cid); 52640a708f8fSGustavo F. Padovan len = __le16_to_cpu(lh->len); 52650a708f8fSGustavo F. Padovan 52660a708f8fSGustavo F. Padovan if (len != skb->len) { 52670a708f8fSGustavo F. Padovan kfree_skb(skb); 52680a708f8fSGustavo F. Padovan return; 52690a708f8fSGustavo F. Padovan } 52700a708f8fSGustavo F. Padovan 52710a708f8fSGustavo F. Padovan BT_DBG("len %d, cid 0x%4.4x", len, cid); 52720a708f8fSGustavo F. Padovan 52730a708f8fSGustavo F. Padovan switch (cid) { 52743300d9a9SClaudio Takahasi case L2CAP_CID_LE_SIGNALING: 52750a708f8fSGustavo F. Padovan case L2CAP_CID_SIGNALING: 52760a708f8fSGustavo F. Padovan l2cap_sig_channel(conn, skb); 52770a708f8fSGustavo F. Padovan break; 52780a708f8fSGustavo F. Padovan 52790a708f8fSGustavo F. Padovan case L2CAP_CID_CONN_LESS: 5280097db76cSAndrei Emeltchenko psm = get_unaligned((__le16 *) skb->data); 52810181a70fSAndrei Emeltchenko skb_pull(skb, L2CAP_PSMLEN_SIZE); 52820a708f8fSGustavo F. Padovan l2cap_conless_channel(conn, psm, skb); 52830a708f8fSGustavo F. Padovan break; 52840a708f8fSGustavo F. Padovan 52859f69bda6SGustavo F. Padovan case L2CAP_CID_LE_DATA: 52869f69bda6SGustavo F. Padovan l2cap_att_channel(conn, cid, skb); 52879f69bda6SGustavo F. Padovan break; 52889f69bda6SGustavo F. Padovan 5289b501d6a1SAnderson Briglia case L2CAP_CID_SMP: 5290b501d6a1SAnderson Briglia if (smp_sig_channel(conn, skb)) 5291b501d6a1SAnderson Briglia l2cap_conn_del(conn->hcon, EACCES); 5292b501d6a1SAnderson Briglia break; 5293b501d6a1SAnderson Briglia 52940a708f8fSGustavo F. Padovan default: 52950a708f8fSGustavo F. Padovan l2cap_data_channel(conn, cid, skb); 52960a708f8fSGustavo F. Padovan break; 52970a708f8fSGustavo F. Padovan } 52980a708f8fSGustavo F. Padovan } 52990a708f8fSGustavo F. Padovan 53000a708f8fSGustavo F. Padovan /* ---- L2CAP interface with lower layer (HCI) ---- */ 53010a708f8fSGustavo F. Padovan 5302686ebf28SUlisses Furquim int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr) 53030a708f8fSGustavo F. Padovan { 53040a708f8fSGustavo F. Padovan int exact = 0, lm1 = 0, lm2 = 0; 530523691d75SGustavo F. Padovan struct l2cap_chan *c; 53060a708f8fSGustavo F. Padovan 53070a708f8fSGustavo F. Padovan BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr)); 53080a708f8fSGustavo F. Padovan 53090a708f8fSGustavo F. Padovan /* Find listening sockets and check their link_mode */ 531023691d75SGustavo F. Padovan read_lock(&chan_list_lock); 531123691d75SGustavo F. Padovan list_for_each_entry(c, &chan_list, global_l) { 531223691d75SGustavo F. Padovan struct sock *sk = c->sk; 53134343478fSGustavo F. Padovan 531489bc500eSGustavo F. Padovan if (c->state != BT_LISTEN) 53150a708f8fSGustavo F. Padovan continue; 53160a708f8fSGustavo F. Padovan 53170a708f8fSGustavo F. Padovan if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { 53180a708f8fSGustavo F. Padovan lm1 |= HCI_LM_ACCEPT; 531943bd0f32SAndrei Emeltchenko if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) 53200a708f8fSGustavo F. Padovan lm1 |= HCI_LM_MASTER; 53210a708f8fSGustavo F. Padovan exact++; 53220a708f8fSGustavo F. Padovan } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { 53230a708f8fSGustavo F. Padovan lm2 |= HCI_LM_ACCEPT; 532443bd0f32SAndrei Emeltchenko if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) 53250a708f8fSGustavo F. Padovan lm2 |= HCI_LM_MASTER; 53260a708f8fSGustavo F. Padovan } 53270a708f8fSGustavo F. Padovan } 532823691d75SGustavo F. Padovan read_unlock(&chan_list_lock); 53290a708f8fSGustavo F. Padovan 53300a708f8fSGustavo F. Padovan return exact ? lm1 : lm2; 53310a708f8fSGustavo F. Padovan } 53320a708f8fSGustavo F. Padovan 5333686ebf28SUlisses Furquim int l2cap_connect_cfm(struct hci_conn *hcon, u8 status) 53340a708f8fSGustavo F. Padovan { 53350a708f8fSGustavo F. Padovan struct l2cap_conn *conn; 53360a708f8fSGustavo F. Padovan 53370a708f8fSGustavo F. Padovan BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status); 53380a708f8fSGustavo F. Padovan 53390a708f8fSGustavo F. Padovan if (!status) { 53400a708f8fSGustavo F. Padovan conn = l2cap_conn_add(hcon, status); 53410a708f8fSGustavo F. Padovan if (conn) 53420a708f8fSGustavo F. Padovan l2cap_conn_ready(conn); 53430a708f8fSGustavo F. Padovan } else 5344e175072fSJoe Perches l2cap_conn_del(hcon, bt_to_errno(status)); 53450a708f8fSGustavo F. Padovan 53460a708f8fSGustavo F. Padovan return 0; 53470a708f8fSGustavo F. Padovan } 53480a708f8fSGustavo F. Padovan 5349686ebf28SUlisses Furquim int l2cap_disconn_ind(struct hci_conn *hcon) 53500a708f8fSGustavo F. Padovan { 53510a708f8fSGustavo F. Padovan struct l2cap_conn *conn = hcon->l2cap_data; 53520a708f8fSGustavo F. Padovan 53530a708f8fSGustavo F. Padovan BT_DBG("hcon %p", hcon); 53540a708f8fSGustavo F. Padovan 5355686ebf28SUlisses Furquim if (!conn) 53569f5a0d7bSAndrei Emeltchenko return HCI_ERROR_REMOTE_USER_TERM; 53570a708f8fSGustavo F. Padovan return conn->disc_reason; 53580a708f8fSGustavo F. Padovan } 53590a708f8fSGustavo F. Padovan 5360686ebf28SUlisses Furquim int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) 53610a708f8fSGustavo F. Padovan { 53620a708f8fSGustavo F. Padovan BT_DBG("hcon %p reason %d", hcon, reason); 53630a708f8fSGustavo F. Padovan 5364e175072fSJoe Perches l2cap_conn_del(hcon, bt_to_errno(reason)); 53650a708f8fSGustavo F. Padovan return 0; 53660a708f8fSGustavo F. Padovan } 53670a708f8fSGustavo F. Padovan 53684343478fSGustavo F. Padovan static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt) 53690a708f8fSGustavo F. Padovan { 5370715ec005SGustavo F. Padovan if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) 53710a708f8fSGustavo F. Padovan return; 53720a708f8fSGustavo F. Padovan 53730a708f8fSGustavo F. Padovan if (encrypt == 0x00) { 53744343478fSGustavo F. Padovan if (chan->sec_level == BT_SECURITY_MEDIUM) { 5375ba13ccd9SMarcel Holtmann __set_chan_timer(chan, L2CAP_ENC_TIMEOUT); 53764343478fSGustavo F. Padovan } else if (chan->sec_level == BT_SECURITY_HIGH) 53770f852724SGustavo F. Padovan l2cap_chan_close(chan, ECONNREFUSED); 53780a708f8fSGustavo F. Padovan } else { 53794343478fSGustavo F. Padovan if (chan->sec_level == BT_SECURITY_MEDIUM) 5380c9b66675SGustavo F. Padovan __clear_chan_timer(chan); 53810a708f8fSGustavo F. Padovan } 53820a708f8fSGustavo F. Padovan } 53830a708f8fSGustavo F. Padovan 5384686ebf28SUlisses Furquim int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) 53850a708f8fSGustavo F. Padovan { 53860a708f8fSGustavo F. Padovan struct l2cap_conn *conn = hcon->l2cap_data; 538748454079SGustavo F. Padovan struct l2cap_chan *chan; 53880a708f8fSGustavo F. Padovan 53890a708f8fSGustavo F. Padovan if (!conn) 53900a708f8fSGustavo F. Padovan return 0; 53910a708f8fSGustavo F. Padovan 539289d8b407SAndrei Emeltchenko BT_DBG("conn %p status 0x%2.2x encrypt %u", conn, status, encrypt); 53930a708f8fSGustavo F. Padovan 5394160dc6acSVinicius Costa Gomes if (hcon->type == LE_LINK) { 539535d4adccSHemant Gupta if (!status && encrypt) 5396160dc6acSVinicius Costa Gomes smp_distribute_keys(conn, 0); 539717cd3f37SUlisses Furquim cancel_delayed_work(&conn->security_timer); 5398160dc6acSVinicius Costa Gomes } 5399160dc6acSVinicius Costa Gomes 54003df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 54010a708f8fSGustavo F. Padovan 54023df91ea2SAndrei Emeltchenko list_for_each_entry(chan, &conn->chan_l, list) { 54036be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 54040a708f8fSGustavo F. Padovan 540589d8b407SAndrei Emeltchenko BT_DBG("chan %p scid 0x%4.4x state %s", chan, chan->scid, 540689d8b407SAndrei Emeltchenko state_to_string(chan->state)); 5407f1cb9af5SVinicius Costa Gomes 5408f1cb9af5SVinicius Costa Gomes if (chan->scid == L2CAP_CID_LE_DATA) { 5409f1cb9af5SVinicius Costa Gomes if (!status && encrypt) { 5410f1cb9af5SVinicius Costa Gomes chan->sec_level = hcon->sec_level; 5411cf4cd009SAndrei Emeltchenko l2cap_chan_ready(chan); 5412f1cb9af5SVinicius Costa Gomes } 5413f1cb9af5SVinicius Costa Gomes 54146be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 5415f1cb9af5SVinicius Costa Gomes continue; 5416f1cb9af5SVinicius Costa Gomes } 5417f1cb9af5SVinicius Costa Gomes 5418c1360a1cSGustavo F. Padovan if (test_bit(CONF_CONNECT_PEND, &chan->conf_state)) { 54196be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 54200a708f8fSGustavo F. Padovan continue; 54210a708f8fSGustavo F. Padovan } 54220a708f8fSGustavo F. Padovan 542389bc500eSGustavo F. Padovan if (!status && (chan->state == BT_CONNECTED || 542489bc500eSGustavo F. Padovan chan->state == BT_CONFIG)) { 5425a7d7723aSGustavo Padovan struct sock *sk = chan->sk; 5426a7d7723aSGustavo Padovan 5427c5daa683SGustavo Padovan clear_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags); 5428a7d7723aSGustavo Padovan sk->sk_state_change(sk); 5429a7d7723aSGustavo Padovan 54304343478fSGustavo F. Padovan l2cap_check_encryption(chan, encrypt); 54316be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 54320a708f8fSGustavo F. Padovan continue; 54330a708f8fSGustavo F. Padovan } 54340a708f8fSGustavo F. Padovan 543589bc500eSGustavo F. Padovan if (chan->state == BT_CONNECT) { 54360a708f8fSGustavo F. Padovan if (!status) { 54379b27f350SAndrei Emeltchenko l2cap_send_conn_req(chan); 54380a708f8fSGustavo F. Padovan } else { 5439ba13ccd9SMarcel Holtmann __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); 54400a708f8fSGustavo F. Padovan } 544189bc500eSGustavo F. Padovan } else if (chan->state == BT_CONNECT2) { 54426be36555SAndrei Emeltchenko struct sock *sk = chan->sk; 54430a708f8fSGustavo F. Padovan struct l2cap_conn_rsp rsp; 5444df3c3931SJohan Hedberg __u16 res, stat; 54450a708f8fSGustavo F. Padovan 54466be36555SAndrei Emeltchenko lock_sock(sk); 54476be36555SAndrei Emeltchenko 54480a708f8fSGustavo F. Padovan if (!status) { 5449c5daa683SGustavo Padovan if (test_bit(BT_SK_DEFER_SETUP, 5450c5daa683SGustavo Padovan &bt_sk(sk)->flags)) { 5451df3c3931SJohan Hedberg struct sock *parent = bt_sk(sk)->parent; 5452df3c3931SJohan Hedberg res = L2CAP_CR_PEND; 5453df3c3931SJohan Hedberg stat = L2CAP_CS_AUTHOR_PEND; 545405e9a2f6SIlia Kolomisnky if (parent) 5455df3c3931SJohan Hedberg parent->sk_data_ready(parent, 0); 5456df3c3931SJohan Hedberg } else { 54570e587be7SAndrei Emeltchenko __l2cap_state_change(chan, BT_CONFIG); 5458df3c3931SJohan Hedberg res = L2CAP_CR_SUCCESS; 5459df3c3931SJohan Hedberg stat = L2CAP_CS_NO_INFO; 5460df3c3931SJohan Hedberg } 54610a708f8fSGustavo F. Padovan } else { 54620e587be7SAndrei Emeltchenko __l2cap_state_change(chan, BT_DISCONN); 5463ba13ccd9SMarcel Holtmann __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); 5464df3c3931SJohan Hedberg res = L2CAP_CR_SEC_BLOCK; 5465df3c3931SJohan Hedberg stat = L2CAP_CS_NO_INFO; 54660a708f8fSGustavo F. Padovan } 54670a708f8fSGustavo F. Padovan 54686be36555SAndrei Emeltchenko release_sock(sk); 54696be36555SAndrei Emeltchenko 5470fe4128e0SGustavo F. Padovan rsp.scid = cpu_to_le16(chan->dcid); 5471fe4128e0SGustavo F. Padovan rsp.dcid = cpu_to_le16(chan->scid); 5472df3c3931SJohan Hedberg rsp.result = cpu_to_le16(res); 5473df3c3931SJohan Hedberg rsp.status = cpu_to_le16(stat); 5474fc7f8a7eSGustavo F. Padovan l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, 5475fc7f8a7eSGustavo F. Padovan sizeof(rsp), &rsp); 54762d369359SMat Martineau 54772d369359SMat Martineau if (!test_bit(CONF_REQ_SENT, &chan->conf_state) && 54782d369359SMat Martineau res == L2CAP_CR_SUCCESS) { 54792d369359SMat Martineau char buf[128]; 54802d369359SMat Martineau set_bit(CONF_REQ_SENT, &chan->conf_state); 54812d369359SMat Martineau l2cap_send_cmd(conn, l2cap_get_ident(conn), 54822d369359SMat Martineau L2CAP_CONF_REQ, 54832d369359SMat Martineau l2cap_build_conf_req(chan, buf), 54842d369359SMat Martineau buf); 54852d369359SMat Martineau chan->num_conf_req++; 54862d369359SMat Martineau } 54870a708f8fSGustavo F. Padovan } 54880a708f8fSGustavo F. Padovan 54896be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 54900a708f8fSGustavo F. Padovan } 54910a708f8fSGustavo F. Padovan 54923df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 54930a708f8fSGustavo F. Padovan 54940a708f8fSGustavo F. Padovan return 0; 54950a708f8fSGustavo F. Padovan } 54960a708f8fSGustavo F. Padovan 5497686ebf28SUlisses Furquim int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) 54980a708f8fSGustavo F. Padovan { 54990a708f8fSGustavo F. Padovan struct l2cap_conn *conn = hcon->l2cap_data; 55000a708f8fSGustavo F. Padovan 55010a708f8fSGustavo F. Padovan if (!conn) 55020a708f8fSGustavo F. Padovan conn = l2cap_conn_add(hcon, 0); 55030a708f8fSGustavo F. Padovan 55040a708f8fSGustavo F. Padovan if (!conn) 55050a708f8fSGustavo F. Padovan goto drop; 55060a708f8fSGustavo F. Padovan 55070a708f8fSGustavo F. Padovan BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); 55080a708f8fSGustavo F. Padovan 55090a708f8fSGustavo F. Padovan if (!(flags & ACL_CONT)) { 55100a708f8fSGustavo F. Padovan struct l2cap_hdr *hdr; 55110a708f8fSGustavo F. Padovan int len; 55120a708f8fSGustavo F. Padovan 55130a708f8fSGustavo F. Padovan if (conn->rx_len) { 55140a708f8fSGustavo F. Padovan BT_ERR("Unexpected start frame (len %d)", skb->len); 55150a708f8fSGustavo F. Padovan kfree_skb(conn->rx_skb); 55160a708f8fSGustavo F. Padovan conn->rx_skb = NULL; 55170a708f8fSGustavo F. Padovan conn->rx_len = 0; 55180a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 55190a708f8fSGustavo F. Padovan } 55200a708f8fSGustavo F. Padovan 55210a708f8fSGustavo F. Padovan /* Start fragment always begin with Basic L2CAP header */ 55220a708f8fSGustavo F. Padovan if (skb->len < L2CAP_HDR_SIZE) { 55230a708f8fSGustavo F. Padovan BT_ERR("Frame is too short (len %d)", skb->len); 55240a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 55250a708f8fSGustavo F. Padovan goto drop; 55260a708f8fSGustavo F. Padovan } 55270a708f8fSGustavo F. Padovan 55280a708f8fSGustavo F. Padovan hdr = (struct l2cap_hdr *) skb->data; 55290a708f8fSGustavo F. Padovan len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; 55300a708f8fSGustavo F. Padovan 55310a708f8fSGustavo F. Padovan if (len == skb->len) { 55320a708f8fSGustavo F. Padovan /* Complete frame received */ 55330a708f8fSGustavo F. Padovan l2cap_recv_frame(conn, skb); 55340a708f8fSGustavo F. Padovan return 0; 55350a708f8fSGustavo F. Padovan } 55360a708f8fSGustavo F. Padovan 55370a708f8fSGustavo F. Padovan BT_DBG("Start: total len %d, frag len %d", len, skb->len); 55380a708f8fSGustavo F. Padovan 55390a708f8fSGustavo F. Padovan if (skb->len > len) { 55400a708f8fSGustavo F. Padovan BT_ERR("Frame is too long (len %d, expected len %d)", 55410a708f8fSGustavo F. Padovan skb->len, len); 55420a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 55430a708f8fSGustavo F. Padovan goto drop; 55440a708f8fSGustavo F. Padovan } 55450a708f8fSGustavo F. Padovan 55460a708f8fSGustavo F. Padovan /* Allocate skb for the complete frame (with header) */ 55470a708f8fSGustavo F. Padovan conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC); 55480a708f8fSGustavo F. Padovan if (!conn->rx_skb) 55490a708f8fSGustavo F. Padovan goto drop; 55500a708f8fSGustavo F. Padovan 55510a708f8fSGustavo F. Padovan skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), 55520a708f8fSGustavo F. Padovan skb->len); 55530a708f8fSGustavo F. Padovan conn->rx_len = len - skb->len; 55540a708f8fSGustavo F. Padovan } else { 55550a708f8fSGustavo F. Padovan BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); 55560a708f8fSGustavo F. Padovan 55570a708f8fSGustavo F. Padovan if (!conn->rx_len) { 55580a708f8fSGustavo F. Padovan BT_ERR("Unexpected continuation frame (len %d)", skb->len); 55590a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 55600a708f8fSGustavo F. Padovan goto drop; 55610a708f8fSGustavo F. Padovan } 55620a708f8fSGustavo F. Padovan 55630a708f8fSGustavo F. Padovan if (skb->len > conn->rx_len) { 55640a708f8fSGustavo F. Padovan BT_ERR("Fragment is too long (len %d, expected %d)", 55650a708f8fSGustavo F. Padovan skb->len, conn->rx_len); 55660a708f8fSGustavo F. Padovan kfree_skb(conn->rx_skb); 55670a708f8fSGustavo F. Padovan conn->rx_skb = NULL; 55680a708f8fSGustavo F. Padovan conn->rx_len = 0; 55690a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 55700a708f8fSGustavo F. Padovan goto drop; 55710a708f8fSGustavo F. Padovan } 55720a708f8fSGustavo F. Padovan 55730a708f8fSGustavo F. Padovan skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), 55740a708f8fSGustavo F. Padovan skb->len); 55750a708f8fSGustavo F. Padovan conn->rx_len -= skb->len; 55760a708f8fSGustavo F. Padovan 55770a708f8fSGustavo F. Padovan if (!conn->rx_len) { 55780a708f8fSGustavo F. Padovan /* Complete frame received */ 55790a708f8fSGustavo F. Padovan l2cap_recv_frame(conn, conn->rx_skb); 55800a708f8fSGustavo F. Padovan conn->rx_skb = NULL; 55810a708f8fSGustavo F. Padovan } 55820a708f8fSGustavo F. Padovan } 55830a708f8fSGustavo F. Padovan 55840a708f8fSGustavo F. Padovan drop: 55850a708f8fSGustavo F. Padovan kfree_skb(skb); 55860a708f8fSGustavo F. Padovan return 0; 55870a708f8fSGustavo F. Padovan } 55880a708f8fSGustavo F. Padovan 55890a708f8fSGustavo F. Padovan static int l2cap_debugfs_show(struct seq_file *f, void *p) 55900a708f8fSGustavo F. Padovan { 559123691d75SGustavo F. Padovan struct l2cap_chan *c; 55920a708f8fSGustavo F. Padovan 5593333055f2SGustavo F. Padovan read_lock(&chan_list_lock); 55940a708f8fSGustavo F. Padovan 559523691d75SGustavo F. Padovan list_for_each_entry(c, &chan_list, global_l) { 559623691d75SGustavo F. Padovan struct sock *sk = c->sk; 55970a708f8fSGustavo F. Padovan 5598903d343eSGustavo F. Padovan seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", 55990a708f8fSGustavo F. Padovan batostr(&bt_sk(sk)->src), 56000a708f8fSGustavo F. Padovan batostr(&bt_sk(sk)->dst), 560189bc500eSGustavo F. Padovan c->state, __le16_to_cpu(c->psm), 560223691d75SGustavo F. Padovan c->scid, c->dcid, c->imtu, c->omtu, 560323691d75SGustavo F. Padovan c->sec_level, c->mode); 56040a708f8fSGustavo F. Padovan } 56050a708f8fSGustavo F. Padovan 5606333055f2SGustavo F. Padovan read_unlock(&chan_list_lock); 56070a708f8fSGustavo F. Padovan 56080a708f8fSGustavo F. Padovan return 0; 56090a708f8fSGustavo F. Padovan } 56100a708f8fSGustavo F. Padovan 56110a708f8fSGustavo F. Padovan static int l2cap_debugfs_open(struct inode *inode, struct file *file) 56120a708f8fSGustavo F. Padovan { 56130a708f8fSGustavo F. Padovan return single_open(file, l2cap_debugfs_show, inode->i_private); 56140a708f8fSGustavo F. Padovan } 56150a708f8fSGustavo F. Padovan 56160a708f8fSGustavo F. Padovan static const struct file_operations l2cap_debugfs_fops = { 56170a708f8fSGustavo F. Padovan .open = l2cap_debugfs_open, 56180a708f8fSGustavo F. Padovan .read = seq_read, 56190a708f8fSGustavo F. Padovan .llseek = seq_lseek, 56200a708f8fSGustavo F. Padovan .release = single_release, 56210a708f8fSGustavo F. Padovan }; 56220a708f8fSGustavo F. Padovan 56230a708f8fSGustavo F. Padovan static struct dentry *l2cap_debugfs; 56240a708f8fSGustavo F. Padovan 562564274518SGustavo F. Padovan int __init l2cap_init(void) 56260a708f8fSGustavo F. Padovan { 56270a708f8fSGustavo F. Padovan int err; 56280a708f8fSGustavo F. Padovan 5629bb58f747SGustavo F. Padovan err = l2cap_init_sockets(); 56300a708f8fSGustavo F. Padovan if (err < 0) 56310a708f8fSGustavo F. Padovan return err; 56320a708f8fSGustavo F. Padovan 56330a708f8fSGustavo F. Padovan if (bt_debugfs) { 56340a708f8fSGustavo F. Padovan l2cap_debugfs = debugfs_create_file("l2cap", 0444, 56350a708f8fSGustavo F. Padovan bt_debugfs, NULL, &l2cap_debugfs_fops); 56360a708f8fSGustavo F. Padovan if (!l2cap_debugfs) 56370a708f8fSGustavo F. Padovan BT_ERR("Failed to create L2CAP debug file"); 56380a708f8fSGustavo F. Padovan } 56390a708f8fSGustavo F. Padovan 56400a708f8fSGustavo F. Padovan return 0; 56410a708f8fSGustavo F. Padovan } 56420a708f8fSGustavo F. Padovan 564364274518SGustavo F. Padovan void l2cap_exit(void) 56440a708f8fSGustavo F. Padovan { 56450a708f8fSGustavo F. Padovan debugfs_remove(l2cap_debugfs); 5646bb58f747SGustavo F. Padovan l2cap_cleanup_sockets(); 56470a708f8fSGustavo F. Padovan } 56480a708f8fSGustavo F. Padovan 56490a708f8fSGustavo F. Padovan module_param(disable_ertm, bool, 0644); 56500a708f8fSGustavo F. Padovan MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); 5651