| /* |
| BlueZ - Bluetooth protocol stack for Linux |
| Copyright (C) 2000-2001 Qualcomm Incorporated |
| Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org> |
| Copyright (C) 2010 Google Inc. |
| Copyright (C) 2011 ProFUSION Embedded Systems |
| Copyright (c) 2012 Code Aurora Forum. All rights reserved. |
| |
| Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License version 2 as |
| published by the Free Software Foundation; |
| |
| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
| OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. |
| IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY |
| CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES |
| WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
| ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
| OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| |
| ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, |
| COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS |
| SOFTWARE IS DISCLAIMED. |
| */ |
| |
| /* Bluetooth L2CAP core. */ |
| |
| #include <linux/module.h> |
| |
| #include <linux/debugfs.h> |
| #include <linux/crc16.h> |
| |
| #include <net/bluetooth/bluetooth.h> |
| #include <net/bluetooth/hci_core.h> |
| #include <net/bluetooth/l2cap.h> |
| #include <net/bluetooth/smp.h> |
| #include <net/bluetooth/a2mp.h> |
| #include <net/bluetooth/amp.h> |
| |
| bool disable_ertm; |
| |
| static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN; |
| static u8 l2cap_fixed_chan[8] = { L2CAP_FC_L2CAP, }; |
| |
| static LIST_HEAD(chan_list); |
| static DEFINE_RWLOCK(chan_list_lock); |
| |
| static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, |
| u8 code, u8 ident, u16 dlen, void *data); |
| static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, |
| void *data); |
| static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data); |
| static void l2cap_send_disconn_req(struct l2cap_conn *conn, |
| struct l2cap_chan *chan, int err); |
| |
| static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
| struct sk_buff_head *skbs, u8 event); |
| |
| /* ---- L2CAP channels ---- */ |
| |
| static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, |
| u16 cid) |
| { |
| struct l2cap_chan *c; |
| |
| list_for_each_entry(c, &conn->chan_l, list) { |
| if (c->dcid == cid) |
| return c; |
| } |
| return NULL; |
| } |
| |
| static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, |
| u16 cid) |
| { |
| struct l2cap_chan *c; |
| |
| list_for_each_entry(c, &conn->chan_l, list) { |
| if (c->scid == cid) |
| return c; |
| } |
| return NULL; |
| } |
| |
| /* Find channel with given SCID. |
| * Returns locked channel. */ |
| static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, |
| u16 cid) |
| { |
| struct l2cap_chan *c; |
| |
| mutex_lock(&conn->chan_lock); |
| c = __l2cap_get_chan_by_scid(conn, cid); |
| if (c) |
| l2cap_chan_lock(c); |
| mutex_unlock(&conn->chan_lock); |
| |
| return c; |
| } |
| |
| /* Find channel with given DCID. |
| * Returns locked channel. |
| */ |
| static struct l2cap_chan *l2cap_get_chan_by_dcid(struct l2cap_conn *conn, |
| u16 cid) |
| { |
| struct l2cap_chan *c; |
| |
| mutex_lock(&conn->chan_lock); |
| c = __l2cap_get_chan_by_dcid(conn, cid); |
| if (c) |
| l2cap_chan_lock(c); |
| mutex_unlock(&conn->chan_lock); |
| |
| return c; |
| } |
| |
| static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, |
| u8 ident) |
| { |
| struct l2cap_chan *c; |
| |
| list_for_each_entry(c, &conn->chan_l, list) { |
| if (c->ident == ident) |
| return c; |
| } |
| return NULL; |
| } |
| |
| static struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn, |
| u8 ident) |
| { |
| struct l2cap_chan *c; |
| |
| mutex_lock(&conn->chan_lock); |
| c = __l2cap_get_chan_by_ident(conn, ident); |
| if (c) |
| l2cap_chan_lock(c); |
| mutex_unlock(&conn->chan_lock); |
| |
| return c; |
| } |
| |
| static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src) |
| { |
| struct l2cap_chan *c; |
| |
| list_for_each_entry(c, &chan_list, global_l) { |
| if (c->sport == psm && !bacmp(&bt_sk(c->sk)->src, src)) |
| return c; |
| } |
| return NULL; |
| } |
| |
| int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm) |
| { |
| int err; |
| |
| write_lock(&chan_list_lock); |
| |
| if (psm && __l2cap_global_chan_by_addr(psm, src)) { |
| err = -EADDRINUSE; |
| goto done; |
| } |
| |
| if (psm) { |
| chan->psm = psm; |
| chan->sport = psm; |
| err = 0; |
| } else { |
| u16 p; |
| |
| err = -EINVAL; |
| for (p = 0x1001; p < 0x1100; p += 2) |
| if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) { |
| chan->psm = cpu_to_le16(p); |
| chan->sport = cpu_to_le16(p); |
| err = 0; |
| break; |
| } |
| } |
| |
| done: |
| write_unlock(&chan_list_lock); |
| return err; |
| } |
| |
| int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid) |
| { |
| write_lock(&chan_list_lock); |
| |
| chan->scid = scid; |
| |
| write_unlock(&chan_list_lock); |
| |
| return 0; |
| } |
| |
| static u16 l2cap_alloc_cid(struct l2cap_conn *conn) |
| { |
| u16 cid = L2CAP_CID_DYN_START; |
| |
| for (; cid < L2CAP_CID_DYN_END; cid++) { |
| if (!__l2cap_get_chan_by_scid(conn, cid)) |
| return cid; |
| } |
| |
| return 0; |
| } |
| |
| static void __l2cap_state_change(struct l2cap_chan *chan, int state) |
| { |
| BT_DBG("chan %p %s -> %s", chan, state_to_string(chan->state), |
| state_to_string(state)); |
| |
| chan->state = state; |
| chan->ops->state_change(chan, state); |
| } |
| |
| static void l2cap_state_change(struct l2cap_chan *chan, int state) |
| { |
| struct sock *sk = chan->sk; |
| |
| lock_sock(sk); |
| __l2cap_state_change(chan, state); |
| release_sock(sk); |
| } |
| |
| static inline void __l2cap_chan_set_err(struct l2cap_chan *chan, int err) |
| { |
| struct sock *sk = chan->sk; |
| |
| sk->sk_err = err; |
| } |
| |
| static inline void l2cap_chan_set_err(struct l2cap_chan *chan, int err) |
| { |
| struct sock *sk = chan->sk; |
| |
| lock_sock(sk); |
| __l2cap_chan_set_err(chan, err); |
| release_sock(sk); |
| } |
| |
| static void __set_retrans_timer(struct l2cap_chan *chan) |
| { |
| if (!delayed_work_pending(&chan->monitor_timer) && |
| chan->retrans_timeout) { |
| l2cap_set_timer(chan, &chan->retrans_timer, |
| msecs_to_jiffies(chan->retrans_timeout)); |
| } |
| } |
| |
| static void __set_monitor_timer(struct l2cap_chan *chan) |
| { |
| __clear_retrans_timer(chan); |
| if (chan->monitor_timeout) { |
| l2cap_set_timer(chan, &chan->monitor_timer, |
| msecs_to_jiffies(chan->monitor_timeout)); |
| } |
| } |
| |
| static struct sk_buff *l2cap_ertm_seq_in_queue(struct sk_buff_head *head, |
| u16 seq) |
| { |
| struct sk_buff *skb; |
| |
| skb_queue_walk(head, skb) { |
| if (bt_cb(skb)->control.txseq == seq) |
| return skb; |
| } |
| |
| return NULL; |
| } |
| |
| /* ---- L2CAP sequence number lists ---- */ |
| |
| /* For ERTM, ordered lists of sequence numbers must be tracked for |
| * SREJ requests that are received and for frames that are to be |
| * retransmitted. These seq_list functions implement a singly-linked |
| * list in an array, where membership in the list can also be checked |
| * in constant time. Items can also be added to the tail of the list |
| * and removed from the head in constant time, without further memory |
| * allocs or frees. |
| */ |
| |
| static int l2cap_seq_list_init(struct l2cap_seq_list *seq_list, u16 size) |
| { |
| size_t alloc_size, i; |
| |
| /* Allocated size is a power of 2 to map sequence numbers |
| * (which may be up to 14 bits) in to a smaller array that is |
| * sized for the negotiated ERTM transmit windows. |
| */ |
| alloc_size = roundup_pow_of_two(size); |
| |
| seq_list->list = kmalloc(sizeof(u16) * alloc_size, GFP_KERNEL); |
| if (!seq_list->list) |
| return -ENOMEM; |
| |
| seq_list->mask = alloc_size - 1; |
| seq_list->head = L2CAP_SEQ_LIST_CLEAR; |
| seq_list->tail = L2CAP_SEQ_LIST_CLEAR; |
| for (i = 0; i < alloc_size; i++) |
| seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; |
| |
| return 0; |
| } |
| |
| static inline void l2cap_seq_list_free(struct l2cap_seq_list *seq_list) |
| { |
| kfree(seq_list->list); |
| } |
| |
| static inline bool l2cap_seq_list_contains(struct l2cap_seq_list *seq_list, |
| u16 seq) |
| { |
| /* Constant-time check for list membership */ |
| return seq_list->list[seq & seq_list->mask] != L2CAP_SEQ_LIST_CLEAR; |
| } |
| |
| static u16 l2cap_seq_list_remove(struct l2cap_seq_list *seq_list, u16 seq) |
| { |
| u16 mask = seq_list->mask; |
| |
| if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) { |
| /* In case someone tries to pop the head of an empty list */ |
| return L2CAP_SEQ_LIST_CLEAR; |
| } else if (seq_list->head == seq) { |
| /* Head can be removed in constant time */ |
| seq_list->head = seq_list->list[seq & mask]; |
| seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR; |
| |
| if (seq_list->head == L2CAP_SEQ_LIST_TAIL) { |
| seq_list->head = L2CAP_SEQ_LIST_CLEAR; |
| seq_list->tail = L2CAP_SEQ_LIST_CLEAR; |
| } |
| } else { |
| /* Walk the list to find the sequence number */ |
| u16 prev = seq_list->head; |
| while (seq_list->list[prev & mask] != seq) { |
| prev = seq_list->list[prev & mask]; |
| if (prev == L2CAP_SEQ_LIST_TAIL) |
| return L2CAP_SEQ_LIST_CLEAR; |
| } |
| |
| /* Unlink the number from the list and clear it */ |
| seq_list->list[prev & mask] = seq_list->list[seq & mask]; |
| seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR; |
| if (seq_list->tail == seq) |
| seq_list->tail = prev; |
| } |
| return seq; |
| } |
| |
| static inline u16 l2cap_seq_list_pop(struct l2cap_seq_list *seq_list) |
| { |
| /* Remove the head in constant time */ |
| return l2cap_seq_list_remove(seq_list, seq_list->head); |
| } |
| |
| static void l2cap_seq_list_clear(struct l2cap_seq_list *seq_list) |
| { |
| u16 i; |
| |
| if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) |
| return; |
| |
| for (i = 0; i <= seq_list->mask; i++) |
| seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; |
| |
| seq_list->head = L2CAP_SEQ_LIST_CLEAR; |
| seq_list->tail = L2CAP_SEQ_LIST_CLEAR; |
| } |
| |
| static void l2cap_seq_list_append(struct l2cap_seq_list *seq_list, u16 seq) |
| { |
| u16 mask = seq_list->mask; |
| |
| /* All appends happen in constant time */ |
| |
| if (seq_list->list[seq & mask] != L2CAP_SEQ_LIST_CLEAR) |
| return; |
| |
| if (seq_list->tail == L2CAP_SEQ_LIST_CLEAR) |
| seq_list->head = seq; |
| else |
| seq_list->list[seq_list->tail & mask] = seq; |
| |
| seq_list->tail = seq; |
| seq_list->list[seq & mask] = L2CAP_SEQ_LIST_TAIL; |
| } |
| |
| static void l2cap_chan_timeout(struct work_struct *work) |
| { |
| struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
| chan_timer.work); |
| struct l2cap_conn *conn = chan->conn; |
| int reason; |
| |
| BT_DBG("chan %p state %s", chan, state_to_string(chan->state)); |
| |
| mutex_lock(&conn->chan_lock); |
| l2cap_chan_lock(chan); |
| |
| if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG) |
| reason = ECONNREFUSED; |
| else if (chan->state == BT_CONNECT && |
| chan->sec_level != BT_SECURITY_SDP) |
| reason = ECONNREFUSED; |
| else |
| reason = ETIMEDOUT; |
| |
| l2cap_chan_close(chan, reason); |
| |
| l2cap_chan_unlock(chan); |
| |
| chan->ops->close(chan); |
| mutex_unlock(&conn->chan_lock); |
| |
| l2cap_chan_put(chan); |
| } |
| |
| struct l2cap_chan *l2cap_chan_create(void) |
| { |
| struct l2cap_chan *chan; |
| |
| chan = kzalloc(sizeof(*chan), GFP_ATOMIC); |
| if (!chan) |
| return NULL; |
| |
| mutex_init(&chan->lock); |
| |
| write_lock(&chan_list_lock); |
| list_add(&chan->global_l, &chan_list); |
| write_unlock(&chan_list_lock); |
| |
| INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout); |
| |
| chan->state = BT_OPEN; |
| |
| kref_init(&chan->kref); |
| |
| /* This flag is cleared in l2cap_chan_ready() */ |
| set_bit(CONF_NOT_COMPLETE, &chan->conf_state); |
| |
| BT_DBG("chan %p", chan); |
| |
| return chan; |
| } |
| |
| static void l2cap_chan_destroy(struct kref *kref) |
| { |
| struct l2cap_chan *chan = container_of(kref, struct l2cap_chan, kref); |
| |
| BT_DBG("chan %p", chan); |
| |
| write_lock(&chan_list_lock); |
| list_del(&chan->global_l); |
| write_unlock(&chan_list_lock); |
| |
| kfree(chan); |
| } |
| |
| void l2cap_chan_hold(struct l2cap_chan *c) |
| { |
| BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount)); |
| |
| kref_get(&c->kref); |
| } |
| |
| void l2cap_chan_put(struct l2cap_chan *c) |
| { |
| BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount)); |
| |
| kref_put(&c->kref, l2cap_chan_destroy); |
| } |
| |
| void l2cap_chan_set_defaults(struct l2cap_chan *chan) |
| { |
| chan->fcs = L2CAP_FCS_CRC16; |
| chan->max_tx = L2CAP_DEFAULT_MAX_TX; |
| chan->tx_win = L2CAP_DEFAULT_TX_WINDOW; |
| chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; |
| chan->ack_win = L2CAP_DEFAULT_TX_WINDOW; |
| chan->sec_level = BT_SECURITY_LOW; |
| |
| set_bit(FLAG_FORCE_ACTIVE, &chan->flags); |
| } |
| |
| void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
| { |
| BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, |
| __le16_to_cpu(chan->psm), chan->dcid); |
| |
| conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
| |
| chan->conn = conn; |
| |
| switch (chan->chan_type) { |
| case L2CAP_CHAN_CONN_ORIENTED: |
| if (conn->hcon->type == LE_LINK) { |
| /* LE connection */ |
| chan->omtu = L2CAP_DEFAULT_MTU; |
| chan->scid = L2CAP_CID_LE_DATA; |
| chan->dcid = L2CAP_CID_LE_DATA; |
| } else { |
| /* Alloc CID for connection-oriented socket */ |
| chan->scid = l2cap_alloc_cid(conn); |
| chan->omtu = L2CAP_DEFAULT_MTU; |
| } |
| break; |
| |
| case L2CAP_CHAN_CONN_LESS: |
| /* Connectionless socket */ |
| chan->scid = L2CAP_CID_CONN_LESS; |
| chan->dcid = L2CAP_CID_CONN_LESS; |
| chan->omtu = L2CAP_DEFAULT_MTU; |
| break; |
| |
| case L2CAP_CHAN_CONN_FIX_A2MP: |
| chan->scid = L2CAP_CID_A2MP; |
| chan->dcid = L2CAP_CID_A2MP; |
| chan->omtu = L2CAP_A2MP_DEFAULT_MTU; |
| chan->imtu = L2CAP_A2MP_DEFAULT_MTU; |
| break; |
| |
| default: |
| /* Raw socket can send/recv signalling messages only */ |
| chan->scid = L2CAP_CID_SIGNALING; |
| chan->dcid = L2CAP_CID_SIGNALING; |
| chan->omtu = L2CAP_DEFAULT_MTU; |
| } |
| |
| chan->local_id = L2CAP_BESTEFFORT_ID; |
| chan->local_stype = L2CAP_SERV_BESTEFFORT; |
| chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE; |
| chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME; |
| chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT; |
| chan->local_flush_to = L2CAP_EFS_DEFAULT_FLUSH_TO; |
| |
| l2cap_chan_hold(chan); |
| |
| list_add(&chan->list, &conn->chan_l); |
| } |
| |
| void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
| { |
| mutex_lock(&conn->chan_lock); |
| __l2cap_chan_add(conn, chan); |
| mutex_unlock(&conn->chan_lock); |
| } |
| |
| void l2cap_chan_del(struct l2cap_chan *chan, int err) |
| { |
| struct l2cap_conn *conn = chan->conn; |
| |
| __clear_chan_timer(chan); |
| |
| BT_DBG("chan %p, conn %p, err %d", chan, conn, err); |
| |
| if (conn) { |
| struct amp_mgr *mgr = conn->hcon->amp_mgr; |
| /* Delete from channel list */ |
| list_del(&chan->list); |
| |
| l2cap_chan_put(chan); |
| |
| chan->conn = NULL; |
| |
| if (chan->chan_type != L2CAP_CHAN_CONN_FIX_A2MP) |
| hci_conn_put(conn->hcon); |
| |
| if (mgr && mgr->bredr_chan == chan) |
| mgr->bredr_chan = NULL; |
| } |
| |
| if (chan->hs_hchan) { |
| struct hci_chan *hs_hchan = chan->hs_hchan; |
| |
| BT_DBG("chan %p disconnect hs_hchan %p", chan, hs_hchan); |
| amp_disconnect_logical_link(hs_hchan); |
| } |
| |
| chan->ops->teardown(chan, err); |
| |
| if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state)) |
| return; |
| |
| switch(chan->mode) { |
| case L2CAP_MODE_BASIC: |
| break; |
| |
| case L2CAP_MODE_ERTM: |
| __clear_retrans_timer(chan); |
| __clear_monitor_timer(chan); |
| __clear_ack_timer(chan); |
| |
| skb_queue_purge(&chan->srej_q); |
| |
| l2cap_seq_list_free(&chan->srej_list); |
| l2cap_seq_list_free(&chan->retrans_list); |
| |
| /* fall through */ |
| |
| case L2CAP_MODE_STREAMING: |
| skb_queue_purge(&chan->tx_q); |
| break; |
| } |
| |
| return; |
| } |
| |
| void l2cap_chan_close(struct l2cap_chan *chan, int reason) |
| { |
| struct l2cap_conn *conn = chan->conn; |
| struct sock *sk = chan->sk; |
| |
| BT_DBG("chan %p state %s sk %p", chan, state_to_string(chan->state), |
| sk); |
| |
| switch (chan->state) { |
| case BT_LISTEN: |
| chan->ops->teardown(chan, 0); |
| break; |
| |
| case BT_CONNECTED: |
| case BT_CONFIG: |
| if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
| conn->hcon->type == ACL_LINK) { |
| __set_chan_timer(chan, sk->sk_sndtimeo); |
| l2cap_send_disconn_req(conn, chan, reason); |
| } else |
| l2cap_chan_del(chan, reason); |
| break; |
| |
| case BT_CONNECT2: |
| if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
| conn->hcon->type == ACL_LINK) { |
| struct l2cap_conn_rsp rsp; |
| __u16 result; |
| |
| if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) |
| result = L2CAP_CR_SEC_BLOCK; |
| else |
| result = L2CAP_CR_BAD_PSM; |
| l2cap_state_change(chan, BT_DISCONN); |
| |
| rsp.scid = cpu_to_le16(chan->dcid); |
| rsp.dcid = cpu_to_le16(chan->scid); |
| rsp.result = cpu_to_le16(result); |
| rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); |
| l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
| sizeof(rsp), &rsp); |
| } |
| |
| l2cap_chan_del(chan, reason); |
| break; |
| |
| case BT_CONNECT: |
| case BT_DISCONN: |
| l2cap_chan_del(chan, reason); |
| break; |
| |
| default: |
| chan->ops->teardown(chan, 0); |
| break; |
| } |
| } |
| |
| static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan) |
| { |
| if (chan->chan_type == L2CAP_CHAN_RAW) { |
| switch (chan->sec_level) { |
| case BT_SECURITY_HIGH: |
| return HCI_AT_DEDICATED_BONDING_MITM; |
| case BT_SECURITY_MEDIUM: |
| return HCI_AT_DEDICATED_BONDING; |
| default: |
| return HCI_AT_NO_BONDING; |
| } |
| } else if (chan->psm == __constant_cpu_to_le16(L2CAP_PSM_SDP)) { |
| if (chan->sec_level == BT_SECURITY_LOW) |
| chan->sec_level = BT_SECURITY_SDP; |
| |
| if (chan->sec_level == BT_SECURITY_HIGH) |
| return HCI_AT_NO_BONDING_MITM; |
| else |
| return HCI_AT_NO_BONDING; |
| } else { |
| switch (chan->sec_level) { |
| case BT_SECURITY_HIGH: |
| return HCI_AT_GENERAL_BONDING_MITM; |
| case BT_SECURITY_MEDIUM: |
| return HCI_AT_GENERAL_BONDING; |
| default: |
| return HCI_AT_NO_BONDING; |
| } |
| } |
| } |
| |
| /* Service level security */ |
| int l2cap_chan_check_security(struct l2cap_chan *chan) |
| { |
| struct l2cap_conn *conn = chan->conn; |
| __u8 auth_type; |
| |
| auth_type = l2cap_get_auth_type(chan); |
| |
| return hci_conn_security(conn->hcon, chan->sec_level, auth_type); |
| } |
| |
| static u8 l2cap_get_ident(struct l2cap_conn *conn) |
| { |
| u8 id; |
| |
| /* Get next available identificator. |
| * 1 - 128 are used by kernel. |
| * 129 - 199 are reserved. |
| * 200 - 254 are used by utilities like l2ping, etc. |
| */ |
| |
| spin_lock(&conn->lock); |
| |
| if (++conn->tx_ident > 128) |
| conn->tx_ident = 1; |
| |
| id = conn->tx_ident; |
| |
| spin_unlock(&conn->lock); |
| |
| return id; |
| } |
| |
| static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, |
| void *data) |
| { |
| struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); |
| u8 flags; |
| |
| BT_DBG("code 0x%2.2x", code); |
| |
| if (!skb) |
| return; |
| |
| if (lmp_no_flush_capable(conn->hcon->hdev)) |
| flags = ACL_START_NO_FLUSH; |
| else |
| flags = ACL_START; |
| |
| bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON; |
| skb->priority = HCI_PRIO_MAX; |
| |
| hci_send_acl(conn->hchan, skb, flags); |
| } |
| |
| static bool __chan_is_moving(struct l2cap_chan *chan) |
| { |
| return chan->move_state != L2CAP_MOVE_STABLE && |
| chan->move_state != L2CAP_MOVE_WAIT_PREPARE; |
| } |
| |
| static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb) |
| { |
| struct hci_conn *hcon = chan->conn->hcon; |
| u16 flags; |
| |
| BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len, |
| skb->priority); |
| |
| if (chan->hs_hcon && !__chan_is_moving(chan)) { |
| if (chan->hs_hchan) |
| hci_send_acl(chan->hs_hchan, skb, ACL_COMPLETE); |
| else |
| kfree_skb(skb); |
| |
| return; |
| } |
| |
| if (!test_bit(FLAG_FLUSHABLE, &chan->flags) && |
| lmp_no_flush_capable(hcon->hdev)) |
| flags = ACL_START_NO_FLUSH; |
| else |
| flags = ACL_START; |
| |
| bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags); |
| hci_send_acl(chan->conn->hchan, skb, flags); |
| } |
| |
| static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control) |
| { |
| control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT; |
| control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT; |
| |
| if (enh & L2CAP_CTRL_FRAME_TYPE) { |
| /* S-Frame */ |
| control->sframe = 1; |
| control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT; |
| control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT; |
| |
| control->sar = 0; |
| control->txseq = 0; |
| } else { |
| /* I-Frame */ |
| control->sframe = 0; |
| control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT; |
| control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT; |
| |
| control->poll = 0; |
| control->super = 0; |
| } |
| } |
| |
| static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control) |
| { |
| control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT; |
| control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT; |
| |
| if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) { |
| /* S-Frame */ |
| control->sframe = 1; |
| control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT; |
| control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT; |
| |
| control->sar = 0; |
| control->txseq = 0; |
| } else { |
| /* I-Frame */ |
| control->sframe = 0; |
| control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT; |
| control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT; |
| |
| control->poll = 0; |
| control->super = 0; |
| } |
| } |
| |
| static inline void __unpack_control(struct l2cap_chan *chan, |
| struct sk_buff *skb) |
| { |
| if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { |
| __unpack_extended_control(get_unaligned_le32(skb->data), |
| &bt_cb(skb)->control); |
| skb_pull(skb, L2CAP_EXT_CTRL_SIZE); |
| } else { |
| __unpack_enhanced_control(get_unaligned_le16(skb->data), |
| &bt_cb(skb)->control); |
| skb_pull(skb, L2CAP_ENH_CTRL_SIZE); |
| } |
| } |
| |
| static u32 __pack_extended_control(struct l2cap_ctrl *control) |
| { |
| u32 packed; |
| |
| packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT; |
| packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT; |
| |
| if (control->sframe) { |
| packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT; |
| packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT; |
| packed |= L2CAP_EXT_CTRL_FRAME_TYPE; |
| } else { |
| packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT; |
| packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT; |
| } |
| |
| return packed; |
| } |
| |
| static u16 __pack_enhanced_control(struct l2cap_ctrl *control) |
| { |
| u16 packed; |
| |
| packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT; |
| packed |= control->final << L2CAP_CTRL_FINAL_SHIFT; |
| |
| if (control->sframe) { |
| packed |= control->poll << L2CAP_CTRL_POLL_SHIFT; |
| packed |= control->super << L2CAP_CTRL_SUPER_SHIFT; |
| packed |= L2CAP_CTRL_FRAME_TYPE; |
| } else { |
| packed |= control->sar << L2CAP_CTRL_SAR_SHIFT; |
| packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT; |
| } |
| |
| return packed; |
| } |
| |
| static inline void __pack_control(struct l2cap_chan *chan, |
| struct l2cap_ctrl *control, |
| struct sk_buff *skb) |
| { |
| if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { |
| put_unaligned_le32(__pack_extended_control(control), |
| skb->data + L2CAP_HDR_SIZE); |
| } else { |
| put_unaligned_le16(__pack_enhanced_control(control), |
| skb->data + L2CAP_HDR_SIZE); |
| } |
| } |
| |
| static inline unsigned int __ertm_hdr_size(struct l2cap_chan *chan) |
| { |
| if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
| return L2CAP_EXT_HDR_SIZE; |
| else |
| return L2CAP_ENH_HDR_SIZE; |
| } |
| |
| static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan, |
| u32 control) |
| { |
| struct sk_buff *skb; |
| struct l2cap_hdr *lh; |
| int hlen = __ertm_hdr_size(chan); |
| |
| if (chan->fcs == L2CAP_FCS_CRC16) |
| hlen += L2CAP_FCS_SIZE; |
| |
| skb = bt_skb_alloc(hlen, GFP_KERNEL); |
| |
| if (!skb) |
| return ERR_PTR(-ENOMEM); |
| |
| lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); |
| lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); |
| lh->cid = cpu_to_le16(chan->dcid); |
| |
| if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
| put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); |
| else |
| put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); |
| |
| if (chan->fcs == L2CAP_FCS_CRC16) { |
| u16 fcs = crc16(0, (u8 *)skb->data, skb->len); |
| put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); |
| } |
| |
| skb->priority = HCI_PRIO_MAX; |
| return skb; |
| } |
| |
| static void l2cap_send_sframe(struct l2cap_chan *chan, |
| struct l2cap_ctrl *control) |
| { |
| struct sk_buff *skb; |
| u32 control_field; |
| |
| BT_DBG("chan %p, control %p", chan, control); |
| |
| if (!control->sframe) |
| return; |
| |
| if (__chan_is_moving(chan)) |
| return; |
| |
| if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) && |
| !control->poll) |
| control->final = 1; |
| |
| if (control->super == L2CAP_SUPER_RR) |
| clear_bit(CONN_RNR_SENT, &chan->conn_state); |
| else if (control->super == L2CAP_SUPER_RNR) |
| set_bit(CONN_RNR_SENT, &chan->conn_state); |
| |
| if (control->super != L2CAP_SUPER_SREJ) { |
| chan->last_acked_seq = control->reqseq; |
| __clear_ack_timer(chan); |
| } |
| |
| BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq, |
| control->final, control->poll, control->super); |
| |
| if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
| control_field = __pack_extended_control(control); |
| else |
| control_field = __pack_enhanced_control(control); |
| |
| skb = l2cap_create_sframe_pdu(chan, control_field); |
| if (!IS_ERR(skb)) |
| l2cap_do_send(chan, skb); |
| } |
| |
| static void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, bool poll) |
| { |
| struct l2cap_ctrl control; |
| |
| BT_DBG("chan %p, poll %d", chan, poll); |
| |
| memset(&control, 0, sizeof(control)); |
| control.sframe = 1; |
| control.poll = poll; |
| |
| if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) |
| control.super = L2CAP_SUPER_RNR; |
| else |
| control.super = L2CAP_SUPER_RR; |
| |
| control.reqseq = chan->buffer_seq; |
| l2cap_send_sframe(chan, &control); |
| } |
| |
| static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan) |
| { |
| return !test_bit(CONF_CONNECT_PEND, &chan->conf_state); |
| } |
| |
| static bool __amp_capable(struct l2cap_chan *chan) |
| { |
| struct l2cap_conn *conn = chan->conn; |
| |
| if (enable_hs && |
| chan->chan_policy == BT_CHANNEL_POLICY_AMP_PREFERRED && |
| conn->fixed_chan_mask & L2CAP_FC_A2MP) |
| return true; |
| else |
| return false; |
| } |
| |
| static bool l2cap_check_efs(struct l2cap_chan *chan) |
| { |
| /* Check EFS parameters */ |
| return true; |
| } |
| |
| void l2cap_send_conn_req(struct l2cap_chan *chan) |
| { |
| struct l2cap_conn *conn = chan->conn; |
| struct l2cap_conn_req req; |
| |
| req.scid = cpu_to_le16(chan->scid); |
| req.psm = chan->psm; |
| |
| chan->ident = l2cap_get_ident(conn); |
| |
| set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
| |
| l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req); |
| } |
| |
| static void l2cap_send_create_chan_req(struct l2cap_chan *chan, u8 amp_id) |
| { |
| struct l2cap_create_chan_req req; |
| req.scid = cpu_to_le16(chan->scid); |
| req.psm = chan->psm; |
| req.amp_id = amp_id; |
| |
| chan->ident = l2cap_get_ident(chan->conn); |
| |
| l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_REQ, |
| sizeof(req), &req); |
| } |
| |
| static void l2cap_move_setup(struct l2cap_chan *chan) |
| { |
| struct sk_buff *skb; |
| |
| BT_DBG("chan %p", chan); |
| |
| if (chan->mode != L2CAP_MODE_ERTM) |
| return; |
| |
| __clear_retrans_timer(chan); |
| __clear_monitor_timer(chan); |
| __clear_ack_timer(chan); |
| |
| chan->retry_count = 0; |
| skb_queue_walk(&chan->tx_q, skb) { |
| if (bt_cb(skb)->control.retries) |
| bt_cb(skb)->control.retries = 1; |
| else |
| break; |
| } |
| |
| chan->expected_tx_seq = chan->buffer_seq; |
| |
| clear_bit(CONN_REJ_ACT, &chan->conn_state); |
| clear_bit(CONN_SREJ_ACT, &chan->conn_state); |
| l2cap_seq_list_clear(&chan->retrans_list); |
| l2cap_seq_list_clear(&chan->srej_list); |
| skb_queue_purge(&chan->srej_q); |
| |
| chan->tx_state = L2CAP_TX_STATE_XMIT; |
| chan->rx_state = L2CAP_RX_STATE_MOVE; |
| |
| set_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
| } |
| |
| static void l2cap_move_done(struct l2cap_chan *chan) |
| { |
| u8 move_role = chan->move_role; |
| BT_DBG("chan %p", chan); |
| |
| chan->move_state = L2CAP_MOVE_STABLE; |
| chan->move_role = L2CAP_MOVE_ROLE_NONE; |
| |
| if (chan->mode != L2CAP_MODE_ERTM) |
| return; |
| |
| switch (move_role) { |
| case L2CAP_MOVE_ROLE_INITIATOR: |
| l2cap_tx(chan, NULL, NULL, L2CAP_EV_EXPLICIT_POLL); |
| chan->rx_state = L2CAP_RX_STATE_WAIT_F; |
| break; |
| case L2CAP_MOVE_ROLE_RESPONDER: |
| chan->rx_state = L2CAP_RX_STATE_WAIT_P; |
| break; |
| } |
| } |
| |
| static void l2cap_chan_ready(struct l2cap_chan *chan) |
| { |
| /* This clears all conf flags, including CONF_NOT_COMPLETE */ |
| chan->conf_state = 0; |
| __clear_chan_timer(chan); |
| |
| chan->state = BT_CONNECTED; |
| |
| chan->ops->ready(chan); |
| } |
| |
| static void l2cap_start_connection(struct l2cap_chan *chan) |
| { |
| if (__amp_capable(chan)) { |
| BT_DBG("chan %p AMP capable: discover AMPs", chan); |
| a2mp_discover_amp(chan); |
| } else { |
| l2cap_send_conn_req(chan); |
| } |
| } |
| |
| static void l2cap_do_start(struct l2cap_chan *chan) |
| { |
| struct l2cap_conn *conn = chan->conn; |
| |
| if (conn->hcon->type == LE_LINK) { |
| l2cap_chan_ready(chan); |
| return; |
| } |
| |
| if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { |
| if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) |
| return; |
| |
| if (l2cap_chan_check_security(chan) && |
| __l2cap_no_conn_pending(chan)) { |
| l2cap_start_connection(chan); |
| } |
| } else { |
| struct l2cap_info_req req; |
| req.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); |
| |
| conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; |
| conn->info_ident = l2cap_get_ident(conn); |
| |
| schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); |
| |
| l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ, |
| sizeof(req), &req); |
| } |
| } |
| |
| static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) |
| { |
| u32 local_feat_mask = l2cap_feat_mask; |
| if (!disable_ertm) |
| local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; |
| |
| switch (mode) { |
| case L2CAP_MODE_ERTM: |
| return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; |
| case L2CAP_MODE_STREAMING: |
| return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; |
| default: |
| return 0x00; |
| } |
| } |
| |
| static void l2cap_send_disconn_req(struct l2cap_conn *conn, |
| struct l2cap_chan *chan, int err) |
| { |
| struct sock *sk = chan->sk; |
| struct l2cap_disconn_req req; |
| |
| if (!conn) |
| return; |
| |
| if (chan->mode == L2CAP_MODE_ERTM && chan->state == BT_CONNECTED) { |
| __clear_retrans_timer(chan); |
| __clear_monitor_timer(chan); |
| __clear_ack_timer(chan); |
| } |
| |
| if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) { |
| l2cap_state_change(chan, BT_DISCONN); |
| return; |
| } |
| |
| req.dcid = cpu_to_le16(chan->dcid); |
| req.scid = cpu_to_le16(chan->scid); |
| l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_DISCONN_REQ, |
| sizeof(req), &req); |
| |
| lock_sock(sk); |
| __l2cap_state_change(chan, BT_DISCONN); |
| __l2cap_chan_set_err(chan, err); |
| release_sock(sk); |
| } |
| |
| /* ---- L2CAP connections ---- */ |
| static void l2cap_conn_start(struct l2cap_conn *conn) |
| { |
| struct l2cap_chan *chan, *tmp; |
| |
| BT_DBG("conn %p", conn); |
| |
| mutex_lock(&conn->chan_lock); |
| |
| list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { |
| struct sock *sk = chan->sk; |
| |
| l2cap_chan_lock(chan); |
| |
| if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
| l2cap_chan_unlock(chan); |
| continue; |
| } |
| |
| if (chan->state == BT_CONNECT) { |
| if (!l2cap_chan_check_security(chan) || |
| !__l2cap_no_conn_pending(chan)) { |
| l2cap_chan_unlock(chan); |
| continue; |
| } |
| |
| if (!l2cap_mode_supported(chan->mode, conn->feat_mask) |
| && test_bit(CONF_STATE2_DEVICE, |
| &chan->conf_state)) { |
| l2cap_chan_close(chan, ECONNRESET); |
| l2cap_chan_unlock(chan); |
| continue; |
| } |
| |
| l2cap_start_connection(chan); |
| |
| } else if (chan->state == BT_CONNECT2) { |
| struct l2cap_conn_rsp rsp; |
| char buf[128]; |
| rsp.scid = cpu_to_le16(chan->dcid); |
| rsp.dcid = cpu_to_le16(chan->scid); |
| |
| if (l2cap_chan_check_security(chan)) { |
| lock_sock(sk); |
| if (test_bit(BT_SK_DEFER_SETUP, |
| &bt_sk(sk)->flags)) { |
| rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND); |
| rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHOR_PEND); |
| chan->ops->defer(chan); |
| |
| } else { |
| __l2cap_state_change(chan, BT_CONFIG); |
| rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS); |
| rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); |
| } |
| release_sock(sk); |
| } else { |
| rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND); |
| rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHEN_PEND); |
| } |
| |
| l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
| sizeof(rsp), &rsp); |
| |
| if (test_bit(CONF_REQ_SENT, &chan->conf_state) || |
| rsp.result != L2CAP_CR_SUCCESS) { |
| l2cap_chan_unlock(chan); |
| continue; |
| } |
| |
| set_bit(CONF_REQ_SENT, &chan->conf_state); |
| l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
| l2cap_build_conf_req(chan, buf), buf); |
| chan->num_conf_req++; |
| } |
| |
| l2cap_chan_unlock(chan); |
| } |
| |
| mutex_unlock(&conn->chan_lock); |
| } |
| |
| /* Find socket with cid and source/destination bdaddr. |
| * Returns closest match, locked. |
| */ |
| static struct l2cap_chan *l2cap_global_chan_by_scid(int state, u16 cid, |
| bdaddr_t *src, |
| bdaddr_t *dst) |
| { |
| struct l2cap_chan *c, *c1 = NULL; |
| |
| read_lock(&chan_list_lock); |
| |
| list_for_each_entry(c, &chan_list, global_l) { |
| struct sock *sk = c->sk; |
| |
| if (state && c->state != state) |
| continue; |
| |
| if (c->scid == cid) { |
| int src_match, dst_match; |
| int src_any, dst_any; |
| |
| /* Exact match. */ |
| src_match = !bacmp(&bt_sk(sk)->src, src); |
| dst_match = !bacmp(&bt_sk(sk)->dst, dst); |
| if (src_match && dst_match) { |
| read_unlock(&chan_list_lock); |
| return c; |
| } |
| |
| /* Closest match */ |
| src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY); |
| dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY); |
| if ((src_match && dst_any) || (src_any && dst_match) || |
| (src_any && dst_any)) |
| c1 = c; |
| } |
| } |
| |
| read_unlock(&chan_list_lock); |
| |
| return c1; |
| } |
| |
| static void l2cap_le_conn_ready(struct l2cap_conn *conn) |
| { |
| struct sock *parent, *sk; |
| struct l2cap_chan *chan, *pchan; |
| |
| BT_DBG(""); |
| |
| /* Check if we have socket listening on cid */ |
| pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA, |
| conn->src, conn->dst); |
| if (!pchan) |
| return; |
| |
| parent = pchan->sk; |
| |
| lock_sock(parent); |
| |
| chan = pchan->ops->new_connection(pchan); |
| if (!chan) |
| goto clean; |
| |
| sk = chan->sk; |
| |
| hci_conn_hold(conn->hcon); |
| conn->hcon->disc_timeout = HCI_DISCONN_TIMEOUT; |
| |
| bacpy(&bt_sk(sk)->src, conn->src); |
| bacpy(&bt_sk(sk)->dst, conn->dst); |
| |
| l2cap_chan_add(conn, chan); |
| |
| l2cap_chan_ready(chan); |
| |
| clean: |
| release_sock(parent); |
| } |
| |
| static void l2cap_conn_ready(struct l2cap_conn *conn) |
| { |
| struct l2cap_chan *chan; |
| struct hci_conn *hcon = conn->hcon; |
| |
| BT_DBG("conn %p", conn); |
| |
| if (!hcon->out && hcon->type == LE_LINK) |
| l2cap_le_conn_ready(conn); |
| |
| if (hcon->out && hcon->type == LE_LINK) |
| smp_conn_security(hcon, hcon->pending_sec_level); |
| |
| mutex_lock(&conn->chan_lock); |
| |
| list_for_each_entry(chan, &conn->chan_l, list) { |
| |
| l2cap_chan_lock(chan); |
| |
| if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) { |
| l2cap_chan_unlock(chan); |
| continue; |
| } |
| |
| if (hcon->type == LE_LINK) { |
| if (smp_conn_security(hcon, chan->sec_level)) |
| l2cap_chan_ready(chan); |
| |
| } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
| struct sock *sk = chan->sk; |
| __clear_chan_timer(chan); |
| lock_sock(sk); |
| __l2cap_state_change(chan, BT_CONNECTED); |
| sk->sk_state_change(sk); |
| release_sock(sk); |
| |
| } else if (chan->state == BT_CONNECT) |
| l2cap_do_start(chan); |
| |
| l2cap_chan_unlock(chan); |
| } |
| |
| mutex_unlock(&conn->chan_lock); |
| } |
| |
| /* Notify sockets that we cannot guaranty reliability anymore */ |
| static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) |
| { |
| struct l2cap_chan *chan; |
| |
| BT_DBG("conn %p", conn); |
| |
| mutex_lock(&conn->chan_lock); |
| |
| list_for_each_entry(chan, &conn->chan_l, list) { |
| if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags)) |
| l2cap_chan_set_err(chan, err); |
| } |
| |
| mutex_unlock(&conn->chan_lock); |
| } |
| |
| static void l2cap_info_timeout(struct work_struct *work) |
| { |
| struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
| info_timer.work); |
| |
| conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
| conn->info_ident = 0; |
| |
| l2cap_conn_start(conn); |
| } |
| |
| static void l2cap_conn_del(struct hci_conn *hcon, int err) |
| { |
| struct l2cap_conn *conn = hcon->l2cap_data; |
| struct l2cap_chan *chan, *l; |
| |
| if (!conn) |
| return; |
| |
| BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); |
| |
| kfree_skb(conn->rx_skb); |
| |
| mutex_lock(&conn->chan_lock); |
| |
| /* Kill channels */ |
| list_for_each_entry_safe(chan, l, &conn->chan_l, list) { |
| l2cap_chan_hold(chan); |
| l2cap_chan_lock(chan); |
| |
| l2cap_chan_del(chan, err); |
| |
| l2cap_chan_unlock(chan); |
| |
| chan->ops->close(chan); |
| l2cap_chan_put(chan); |
| } |
| |
| mutex_unlock(&conn->chan_lock); |
| |
| hci_chan_del(conn->hchan); |
| |
| if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
| cancel_delayed_work_sync(&conn->info_timer); |
| |
| if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) { |
| cancel_delayed_work_sync(&conn->security_timer); |
| smp_chan_destroy(conn); |
| } |
| |
| hcon->l2cap_data = NULL; |
| kfree(conn); |
| } |
| |
| static void security_timeout(struct work_struct *work) |
| { |
| struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
| security_timer.work); |
| |
| BT_DBG("conn %p", conn); |
| |
| if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags)) { |
| smp_chan_destroy(conn); |
| l2cap_conn_del(conn->hcon, ETIMEDOUT); |
| } |
| } |
| |
| static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) |
| { |
| struct l2cap_conn *conn = hcon->l2cap_data; |
| struct hci_chan *hchan; |
| |
| if (conn || status) |
| return conn; |
| |
| hchan = hci_chan_create(hcon); |
| if (!hchan) |
| return NULL; |
| |
| conn = kzalloc(sizeof(struct l2cap_conn), GFP_KERNEL); |
| if (!conn) { |
| hci_chan_del(hchan); |
| return NULL; |
| } |
| |
| hcon->l2cap_data = conn; |
| conn->hcon = hcon; |
| conn->hchan = hchan; |
| |
| BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan); |
| |
| switch (hcon->type) { |
| case AMP_LINK: |
| conn->mtu = hcon->hdev->block_mtu; |
| break; |
| |
| case LE_LINK: |
| if (hcon->hdev->le_mtu) { |
| conn->mtu = hcon->hdev->le_mtu; |
| break; |
| } |
| /* fall through */ |
| |
| default: |
| conn->mtu = hcon->hdev->acl_mtu; |
| break; |
| } |
| |
| conn->src = &hcon->hdev->bdaddr; |
| conn->dst = &hcon->dst; |
| |
| conn->feat_mask = 0; |
| |
| spin_lock_init(&conn->lock); |
| mutex_init(&conn->chan_lock); |
| |
| INIT_LIST_HEAD(&conn->chan_l); |
| |
| if (hcon->type == LE_LINK) |
| INIT_DELAYED_WORK(&conn->security_timer, security_timeout); |
| else |
| INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout); |
| |
| conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
| |
| return conn; |
| } |
| |
| /* ---- Socket interface ---- */ |
| |
| /* Find socket with psm and source / destination bdaddr. |
| * Returns closest match. |
| */ |
| static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, |
| bdaddr_t *src, |
| bdaddr_t *dst) |
| { |
| struct l2cap_chan *c, *c1 = NULL; |
| |
| read_lock(&chan_list_lock); |
| |
| list_for_each_entry(c, &chan_list, global_l) { |
| struct sock *sk = c->sk; |
| |
| if (state && c->state != state) |
| continue; |
| |
| if (c->psm == psm) { |
| int src_match, dst_match; |
| int src_any, dst_any; |
| |
| /* Exact match. */ |
| src_match = !bacmp(&bt_sk(sk)->src, src); |
| dst_match = !bacmp(&bt_sk(sk)->dst, dst); |
| if (src_match && dst_match) { |
| read_unlock(&chan_list_lock); |
| return c; |
| } |
| |
| /* Closest match */ |
| src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY); |
| dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY); |
| if ((src_match && dst_any) || (src_any && dst_match) || |
| (src_any && dst_any)) |
| c1 = c; |
| } |
| } |
| |
| read_unlock(&chan_list_lock); |
| |
| return c1; |
| } |
| |
| int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid, |
| bdaddr_t *dst, u8 dst_type) |
| { |
| struct sock *sk = chan->sk; |
| bdaddr_t *src = &bt_sk(sk)->src; |
| struct l2cap_conn *conn; |
| struct hci_conn *hcon; |
| struct hci_dev *hdev; |
| __u8 auth_type; |
| int err; |
| |
| BT_DBG("%pMR -> %pMR (type %u) psm 0x%2.2x", src, dst, |
| dst_type, __le16_to_cpu(psm)); |
| |
| hdev = hci_get_route(dst, src); |
| if (!hdev) |
| return -EHOSTUNREACH; |
| |
| hci_dev_lock(hdev); |
| |
| l2cap_chan_lock(chan); |
| |
| /* PSM must be odd and lsb of upper byte must be 0 */ |
| if ((__le16_to_cpu(psm) & 0x0101) != 0x0001 && !cid && |
| chan->chan_type != L2CAP_CHAN_RAW) { |
| err = -EINVAL; |
| goto done; |
| } |
| |
| if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !(psm || cid)) { |
| err = -EINVAL; |
| goto done; |
| } |
| |
| switch (chan->mode) { |
| case L2CAP_MODE_BASIC: |
| break; |
| case L2CAP_MODE_ERTM: |
| case L2CAP_MODE_STREAMING: |
| if (!disable_ertm) |
| break; |
| /* fall through */ |
| default: |
| err = -ENOTSUPP; |
| goto done; |
| } |
| |
| switch (chan->state) { |
| case BT_CONNECT: |
| case BT_CONNECT2: |
| case BT_CONFIG: |
| /* Already connecting */ |
| err = 0; |
| goto done; |
| |
| case BT_CONNECTED: |
| /* Already connected */ |
| err = -EISCONN; |
| goto done; |
| |
| case BT_OPEN: |
| case BT_BOUND: |
| /* Can connect */ |
| break; |
| |
| default: |
| err = -EBADFD; |
| goto done; |
| } |
| |
| /* Set destination address and psm */ |
| lock_sock(sk); |
| bacpy(&bt_sk(sk)->dst, dst); |
| release_sock(sk); |
| |
| chan->psm = psm; |
| chan->dcid = cid; |
| |
| auth_type = l2cap_get_auth_type(chan); |
| |
| if (chan->dcid == L2CAP_CID_LE_DATA) |
| hcon = hci_connect(hdev, LE_LINK, dst, dst_type, |
| chan->sec_level, auth_type); |
| else |
| hcon = hci_connect(hdev, ACL_LINK, dst, dst_type, |
| chan->sec_level, auth_type); |
| |
| if (IS_ERR(hcon)) { |
| err = PTR_ERR(hcon); |
| goto done; |
| } |
| |
| conn = l2cap_conn_add(hcon, 0); |
| if (!conn) { |
| hci_conn_put(hcon); |
| err = -ENOMEM; |
| goto done; |
| } |
| |
| if (hcon->type == LE_LINK) { |
| err = 0; |
| |
| if (!list_empty(&conn->chan_l)) { |
| err = -EBUSY; |
| hci_conn_put(hcon); |
| } |
| |
| if (err) |
| goto done; |
| } |
| |
| /* Update source addr of the socket */ |
| bacpy(src, conn->src); |
| |
| l2cap_chan_unlock(chan); |
| l2cap_chan_add(conn, chan); |
| l2cap_chan_lock(chan); |
| |
| l2cap_state_change(chan, BT_CONNECT); |
| __set_chan_timer(chan, sk->sk_sndtimeo); |
| |
| if (hcon->state == BT_CONNECTED) { |
| if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
| __clear_chan_timer(chan); |
| if (l2cap_chan_check_security(chan)) |
| l2cap_state_change(chan, BT_CONNECTED); |
| } else |
| l2cap_do_start(chan); |
| } |
| |
| err = 0; |
| |
| done: |
| l2cap_chan_unlock(chan); |
| hci_dev_unlock(hdev); |
| hci_dev_put(hdev); |
| return err; |
| } |
| |
| int __l2cap_wait_ack(struct sock *sk) |
| { |
| struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
| DECLARE_WAITQUEUE(wait, current); |
| int err = 0; |
| int timeo = HZ/5; |
| |
| add_wait_queue(sk_sleep(sk), &wait); |
| set_current_state(TASK_INTERRUPTIBLE); |
| while (chan->unacked_frames > 0 && chan->conn) { |
| if (!timeo) |
| timeo = HZ/5; |
| |
| if (signal_pending(current)) { |
| err = sock_intr_errno(timeo); |
| break; |
| } |
| |
| release_sock(sk); |
| timeo = schedule_timeout(timeo); |
| lock_sock(sk); |
| set_current_state(TASK_INTERRUPTIBLE); |
| |
| err = sock_error(sk); |
| if (err) |
| break; |
| } |
| set_current_state(TASK_RUNNING); |
| remove_wait_queue(sk_sleep(sk), &wait); |
| return err; |
| } |
| |
| static void l2cap_monitor_timeout(struct work_struct *work) |
| { |
| struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
| monitor_timer.work); |
| |
| BT_DBG("chan %p", chan); |
| |
| l2cap_chan_lock(chan); |
| |
| if (!chan->conn) { |
| l2cap_chan_unlock(chan); |
| l2cap_chan_put(chan); |
| return; |
| } |
| |
| l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO); |
| |
| l2cap_chan_unlock(chan); |
| l2cap_chan_put(chan); |
| } |
| |
| static void l2cap_retrans_timeout(struct work_struct *work) |
| { |
| struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
| retrans_timer.work); |
| |
| BT_DBG("chan %p", chan); |
| |
| l2cap_chan_lock(chan); |
| |
| if (!chan->conn) { |
| l2cap_chan_unlock(chan); |
| l2cap_chan_put(chan); |
| return; |
| } |
| |
| l2cap_tx(chan, NULL, NULL, L2CAP_EV_RETRANS_TO); |
| l2cap_chan_unlock(chan); |
| l2cap_chan_put(chan); |
| } |
| |
| static void l2cap_streaming_send(struct l2cap_chan *chan, |
| struct sk_buff_head *skbs) |
| { |
| struct sk_buff *skb; |
| struct l2cap_ctrl *control; |
| |
| BT_DBG("chan %p, skbs %p", chan, skbs); |
| |
| if (__chan_is_moving(chan)) |
| return; |
| |
| skb_queue_splice_tail_init(skbs, &chan->tx_q); |
| |
| while (!skb_queue_empty(&chan->tx_q)) { |
| |
| skb = skb_dequeue(&chan->tx_q); |
| |
| bt_cb(skb)->control.retries = 1; |
| control = &bt_cb(skb)->control; |
| |
| control->reqseq = 0; |
| control->txseq = chan->next_tx_seq; |
| |
| __pack_control(chan, control, skb); |
| |
| if (chan->fcs == L2CAP_FCS_CRC16) { |
| u16 fcs = crc16(0, (u8 *) skb->data, skb->len); |
| put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); |
| } |
| |
| l2cap_do_send(chan, skb); |
| |
| BT_DBG("Sent txseq %u", control->txseq); |
| |
| chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); |
| chan->frames_sent++; |
| } |
| } |
| |
| static int l2cap_ertm_send(struct l2cap_chan *chan) |
| { |
| struct sk_buff *skb, *tx_skb; |
| struct l2cap_ctrl *control; |
| int sent = 0; |
| |
| BT_DBG("chan %p", chan); |
| |
| if (chan->state != BT_CONNECTED) |
| return -ENOTCONN; |
| |
| if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) |
| return 0; |
| |
| if (__chan_is_moving(chan)) |
| return 0; |
| |
| while (chan->tx_send_head && |
| chan->unacked_frames < chan->remote_tx_win && |
| chan->tx_state == L2CAP_TX_STATE_XMIT) { |
| |
| skb = chan->tx_send_head; |
| |
| bt_cb(skb)->control.retries = 1; |
| control = &bt_cb(skb)->control; |
| |
| if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
| control->final = 1; |
| |
| control->reqseq = chan->buffer_seq; |
| chan->last_acked_seq = chan->buffer_seq; |
| control->txseq = chan->next_tx_seq; |
| |
| __pack_control(chan, control, skb); |
| |
| if (chan->fcs == L2CAP_FCS_CRC16) { |
| u16 fcs = crc16(0, (u8 *) skb->data, skb->len); |
| put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); |
| } |
| |
| /* Clone after data has been modified. Data is assumed to be |
| read-only (for locking purposes) on cloned sk_buffs. |
| */ |
| tx_skb = skb_clone(skb, GFP_KERNEL); |
| |
| if (!tx_skb) |
| break; |
| |
| __set_retrans_timer(chan); |
| |
| chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); |
| chan->unacked_frames++; |
| chan->frames_sent++; |
| sent++; |
| |
| if (skb_queue_is_last(&chan->tx_q, skb)) |
| chan->tx_send_head = NULL; |
| else |
| chan->tx_send_head = skb_queue_next(&chan->tx_q, skb); |
| |
| l2cap_do_send(chan, tx_skb); |
| BT_DBG("Sent txseq %u", control->txseq); |
| } |
| |
| BT_DBG("Sent %d, %u unacked, %u in ERTM queue", sent, |
| chan->unacked_frames, skb_queue_len(&chan->tx_q)); |
| |
| return sent; |
| } |
| |
| static void l2cap_ertm_resend(struct l2cap_chan *chan) |
| { |
| struct l2cap_ctrl control; |
| struct sk_buff *skb; |
| struct sk_buff *tx_skb; |
| u16 seq; |
| |
| BT_DBG("chan %p", chan); |
| |
| if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) |
| return; |
| |
| if (__chan_is_moving(chan)) |
| return; |
| |
| while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) { |
| seq = l2cap_seq_list_pop(&chan->retrans_list); |
| |
| skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq); |
| if (!skb) { |
| BT_DBG("Error: Can't retransmit seq %d, frame missing", |
| seq); |
| continue; |
| } |
| |
| bt_cb(skb)->control.retries++; |
| control = bt_cb(skb)->control; |
| |
| if (chan->max_tx != 0 && |
| bt_cb(skb)->control.retries > chan->max_tx) { |
| BT_DBG("Retry limit exceeded (%d)", chan->max_tx); |
| l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
| l2cap_seq_list_clear(&chan->retrans_list); |
| break; |
| } |
| |
| control.reqseq = chan->buffer_seq; |
| if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
| control.final = 1; |
| else |
| control.final = 0; |
| |
| if (skb_cloned(skb)) { |
| /* Cloned sk_buffs are read-only, so we need a |
| * writeable copy |
| */ |
| tx_skb = skb_copy(skb, GFP_KERNEL); |
| } else { |
| tx_skb = skb_clone(skb, GFP_KERNEL); |
| } |
| |
| if (!tx_skb) { |
| l2cap_seq_list_clear(&chan->retrans_list); |
| break; |
| } |
| |
| /* Update skb contents */ |
| if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { |
| put_unaligned_le32(__pack_extended_control(&control), |
| tx_skb->data + L2CAP_HDR_SIZE); |
| } else { |
| put_unaligned_le16(__pack_enhanced_control(&control), |
| tx_skb->data + L2CAP_HDR_SIZE); |
| } |
| |
| if (chan->fcs == L2CAP_FCS_CRC16) { |
| u16 fcs = crc16(0, (u8 *) tx_skb->data, tx_skb->len); |
| put_unaligned_le16(fcs, skb_put(tx_skb, |
| L2CAP_FCS_SIZE)); |
| } |
| |
| l2cap_do_send(chan, tx_skb); |
| |
| BT_DBG("Resent txseq %d", control.txseq); |
| |
| chan->last_acked_seq = chan->buffer_seq; |
| } |
| } |
| |
| static void l2cap_retransmit(struct l2cap_chan *chan, |
| struct l2cap_ctrl *control) |
| { |
| BT_DBG("chan %p, control %p", chan, control); |
| |
| l2cap_seq_list_append(&chan->retrans_list, control->reqseq); |
| l2cap_ertm_resend(chan); |
| } |
| |
| static void l2cap_retransmit_all(struct l2cap_chan *chan, |
| struct l2cap_ctrl *control) |
| { |
| struct sk_buff *skb; |
| |
| BT_DBG("chan %p, control %p", chan, control); |
| |
| if (control->poll) |
| set_bit(CONN_SEND_FBIT, &chan->conn_state); |
| |
| l2cap_seq_list_clear(&chan->retrans_list); |
| |
| if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) |
| return; |
| |
| if (chan->unacked_frames) { |
| skb_queue_walk(&chan->tx_q, skb) { |
| if (bt_cb(skb)->control.txseq == control->reqseq || |
| skb == chan->tx_send_head) |
| break; |
| } |
| |
| skb_queue_walk_from(&chan->tx_q, skb) { |
| if (skb == chan->tx_send_head) |
| break; |
| |
| l2cap_seq_list_append(&chan->retrans_list, |
| bt_cb(skb)->control.txseq); |
| } |
| |
| l2cap_ertm_resend(chan); |
| } |
| } |
| |
| static void l2cap_send_ack(struct l2cap_chan *chan) |
| { |
| struct l2cap_ctrl control; |
| u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq, |
| chan->last_acked_seq); |
| int threshold; |
| |
| BT_DBG("chan %p last_acked_seq %d buffer_seq %d", |
| chan, chan->last_acked_seq, chan->buffer_seq); |
| |
| memset(&control, 0, sizeof(control)); |
| control.sframe = 1; |
| |
| if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
| chan->rx_state == L2CAP_RX_STATE_RECV) { |
| __clear_ack_timer(chan); |
| control.super = L2CAP_SUPER_RNR; |
| control.reqseq = chan->buffer_seq; |
| l2cap_send_sframe(chan, &control); |
| } else { |
| if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) { |
| l2cap_ertm_send(chan); |
| /* If any i-frames were sent, they included an ack */ |
| if (chan->buffer_seq == chan->last_acked_seq) |
| frames_to_ack = 0; |
| } |
| |
| /* Ack now if the window is 3/4ths full. |
| * Calculate without mul or div |
| */ |
| threshold = chan->ack_win; |
| threshold += threshold << 1; |
| threshold >>= 2; |
| |
| BT_DBG("frames_to_ack %u, threshold %d", frames_to_ack, |
| threshold); |
| |
| if (frames_to_ack >= threshold) { |
| __clear_ack_timer(chan); |
| control.super = L2CAP_SUPER_RR; |
| control.reqseq = chan->buffer_seq; |
| l2cap_send_sframe(chan, &control); |
| frames_to_ack = 0; |
| } |
| |
| if (frames_to_ack) |
| __set_ack_timer(chan); |
| } |
| } |
| |
| static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan, |
| struct msghdr *msg, int len, |
| int count, struct sk_buff *skb) |
| { |
| struct l2cap_conn *conn = chan->conn; |
| struct sk_buff **frag; |
| int sent = 0; |
| |
| if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) |
| return -EFAULT; |
| |
| sent += count; |
| len -= count; |
| |
| /* Continuation fragments (no L2CAP header) */ |
| frag = &skb_shinfo(skb)->frag_list; |
| while (len) { |
| struct sk_buff *tmp; |
| |
| count = min_t(unsigned int, conn->mtu, len); |
| |
| tmp = chan->ops->alloc_skb(chan, count, |
| msg->msg_flags & MSG_DONTWAIT); |
| if (IS_ERR(tmp)) |
| return PTR_ERR(tmp); |
| |
| *frag = tmp; |
| |
| if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) |
| return -EFAULT; |
| |
| (*frag)->priority = skb->priority; |
| |
| sent += count; |
| len -= count; |
| |
| skb->len += (*frag)->len; |
| skb->data_len += (*frag)->len; |
| |
| frag = &(*frag)->next; |
| } |
| |
| return sent; |
| } |
| |
| static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, |
| struct msghdr *msg, size_t len, |
| u32 priority) |
| { |
| struct l2cap_conn *conn = chan->conn; |
| struct sk_buff *skb; |
| int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE; |
| struct l2cap_hdr *lh; |
| |
| BT_DBG("chan %p len %zu priority %u", chan, len, priority); |
| |
| count = min_t(unsigned int, (conn->mtu - hlen), len); |
| |
| skb = chan->ops->alloc_skb(chan, count + hlen, |
| msg->msg_flags & MSG_DONTWAIT); |
| if (IS_ERR(skb)) |
| return skb; |
| |
| skb->priority = priority; |
| |
| /* Create L2CAP header */ |
| lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); |
| lh->cid = cpu_to_le16(chan->dcid); |
| lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE); |
| put_unaligned(chan->psm, skb_put(skb, L2CAP_PSMLEN_SIZE)); |
| |
| err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
| if (unlikely(err < 0)) { |
| kfree_skb(skb); |
| return ERR_PTR(err); |
| } |
| return skb; |
| } |
| |
| static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, |
| struct msghdr *msg, size_t len, |
| u32 priority) |
| { |
| struct l2cap_conn *conn = chan->conn; |
| struct sk_buff *skb; |
| int err, count; |
| struct l2cap_hdr *lh; |
| |
| BT_DBG("chan %p len %zu", chan, len); |
| |
| count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len); |
| |
| skb = chan->ops->alloc_skb(chan, count + L2CAP_HDR_SIZE, |
| msg->msg_flags & MSG_DONTWAIT); |
| if (IS_ERR(skb)) |
| return skb; |
| |
| skb->priority = priority; |
| |
| /* Create L2CAP header */ |
| lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); |
| lh->cid = cpu_to_le16(chan->dcid); |
| lh->len = cpu_to_le16(len); |
| |
| err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
| if (unlikely(err < 0)) { |
| kfree_skb(skb); |
| return ERR_PTR(err); |
| } |
| return skb; |
| } |
| |
| static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, |
| struct msghdr *msg, size_t len, |
| u16 sdulen) |
| { |
| struct l2cap_conn *conn = chan->conn; |
| struct sk_buff *skb; |
| int err, count, hlen; |
| struct l2cap_hdr *lh; |
| |
| BT_DBG("chan %p len %zu", chan, len); |
| |
| if (!conn) |
| return ERR_PTR(-ENOTCONN); |
| |
| hlen = __ertm_hdr_size(chan); |
| |
| if (sdulen) |
| hlen += L2CAP_SDULEN_SIZE; |
| |
| if (chan->fcs == L2CAP_FCS_CRC16) |
| hlen += L2CAP_FCS_SIZE; |
| |
| count = min_t(unsigned int, (conn->mtu - hlen), len); |
| |
| skb = chan->ops->alloc_skb(chan, count + hlen, |
| msg->msg_flags & MSG_DONTWAIT); |
| if (IS_ERR(skb)) |
| return skb; |
| |
| /* Create L2CAP header */ |
| lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); |
| lh->cid = cpu_to_le16(chan->dcid); |
| lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
| |
| /* Control header is populated later */ |
| if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
| put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); |
| else |
| put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); |
| |
| if (sdulen) |
| put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE)); |
| |
| err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
| if (unlikely(err < 0)) { |
| kfree_skb(skb); |
| return ERR_PTR(err); |
| } |
| |
| bt_cb(skb)->control.fcs = chan->fcs; |
| bt_cb(skb)->control.retries = 0; |
| return skb; |
| } |
| |
| static int l2cap_segment_sdu(struct l2cap_chan *chan, |
| struct sk_buff_head *seg_queue, |
| struct msghdr *msg, size_t len) |
| { |
| struct sk_buff *skb; |
| u16 sdu_len; |
| size_t pdu_len; |
| u8 sar; |
| |
| BT_DBG("chan %p, msg %p, len %zu", chan, msg, len); |
| |
| /* It is critical that ERTM PDUs fit in a single HCI fragment, |
| * so fragmented skbs are not used. The HCI layer's handling |
| * of fragmented skbs is not compatible with ERTM's queueing. |
| */ |
| |
| /* PDU size is derived from the HCI MTU */ |
| pdu_len = chan->conn->mtu; |
| |
| /* Constrain PDU size for BR/EDR connections */ |
| if (!chan->hs_hcon) |
| pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD); |
| |
| /* Adjust for largest possible L2CAP overhead. */ |
| if (chan->fcs) |
| pdu_len -= L2CAP_FCS_SIZE; |
| |
| pdu_len -= __ertm_hdr_size(chan); |
| |
| /* Remote device may have requested smaller PDUs */ |
| pdu_len = min_t(size_t, pdu_len, chan->remote_mps); |
| |
| if (len <= pdu_len) { |
| sar = L2CAP_SAR_UNSEGMENTED; |
| sdu_len = 0; |
| pdu_len = len; |
| } else { |
| sar = L2CAP_SAR_START; |
| sdu_len = len; |
| pdu_len -= L2CAP_SDULEN_SIZE; |
| } |
| |
| while (len > 0) { |
| skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len); |
| |
| if (IS_ERR(skb)) { |
| __skb_queue_purge(seg_queue); |
| return PTR_ERR(skb); |
| } |
| |
| bt_cb(skb)->control.sar = sar; |
| __skb_queue_tail(seg_queue, skb); |
| |
| len -= pdu_len; |
| if (sdu_len) { |
| sdu_len = 0; |
| pdu_len += L2CAP_SDULEN_SIZE; |
| } |
| |
| if (len <= pdu_len) { |
| sar = L2CAP_SAR_END; |
| pdu_len = len; |
| } else { |
| sar = L2CAP_SAR_CONTINUE; |
| } |
| } |
| |
| return 0; |
| } |
| |
| int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len, |
| u32 priority) |
| { |
| struct sk_buff *skb; |
| int err; |
| struct sk_buff_head seg_queue; |
| |
| /* Connectionless channel */ |
| if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { |
| skb = l2cap_create_connless_pdu(chan, msg, len, priority); |
| if (IS_ERR(skb)) |
| return PTR_ERR(skb); |
| |
| l2cap_do_send(chan, skb); |
| return len; |
| } |
| |
| switch (chan->mode) { |
| case L2CAP_MODE_BASIC: |
| /* Check outgoing MTU */ |
| if (len > chan->omtu) |
| return -EMSGSIZE; |
| |
| /* Create a basic PDU */ |
| skb = l2cap_create_basic_pdu(chan, msg, len, priority); |
| if (IS_ERR(skb)) |
| return PTR_ERR(skb); |
| |
| l2cap_do_send(chan, skb); |
| err = len; |
| break; |
| |
| case L2CAP_MODE_ERTM: |
| case L2CAP_MODE_STREAMING: |
| /* Check outgoing MTU */ |
| if (len > chan->omtu) { |
| err = -EMSGSIZE; |
| break; |
| } |
| |
| __skb_queue_head_init(&seg_queue); |
| |
| /* Do segmentation before calling in to the state machine, |
| * since it's possible to block while waiting for memory |
| * allocation. |
| */ |
| err = l2cap_segment_sdu(chan, &seg_queue, msg, len); |
| |
| /* The channel could have been closed while segmenting, |
| * check that it is still connected. |
| */ |
| if (chan->state != BT_CONNECTED) { |
| __skb_queue_purge(&seg_queue); |
| err = -ENOTCONN; |
| } |
| |
| if (err) |
| break; |
| |
| if (chan->mode == L2CAP_MODE_ERTM) |
| l2cap_tx(chan, NULL, &seg_queue, L2CAP_EV_DATA_REQUEST); |
| else |
| l2cap_streaming_send(chan, &seg_queue); |
| |
| err = len; |
| |
| /* If the skbs were not queued for sending, they'll still be in |
| * seg_queue and need to be purged. |
| */ |
| __skb_queue_purge(&seg_queue); |
| break; |
| |
| default: |
| BT_DBG("bad state %1.1x", chan->mode); |
| err = -EBADFD; |
| } |
| |
| return err; |
| } |
| |
| static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq) |
| { |
| struct l2cap_ctrl control; |
| u16 seq; |
| |
| BT_DBG("chan %p, txseq %u", chan, txseq); |
| |
| memset(&control, 0, sizeof(control)); |
| control.sframe = 1; |
| control.super = L2CAP_SUPER_SREJ; |
| |
| for (seq = chan->expected_tx_seq; seq != txseq; |
| seq = __next_seq(chan, seq)) { |
| if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) { |
| control.reqseq = seq; |
| l2cap_send_sframe(chan, &control); |
| l2cap_seq_list_append(&chan->srej_list, seq); |
| } |
| } |
| |
| chan->expected_tx_seq = __next_seq(chan, txseq); |
| } |
| |
| static void l2cap_send_srej_tail(struct l2cap_chan *chan) |
| { |
| struct l2cap_ctrl control; |
| |
| BT_DBG("chan %p", chan); |
| |
| if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR) |
| return; |
| |
| memset(&control, 0, sizeof(control)); |
| control.sframe = 1; |
| control.super = L2CAP_SUPER_SREJ; |
| control.reqseq = chan->srej_list.tail; |
| l2cap_send_sframe(chan, &control); |
| } |
| |
| static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq) |
| { |
| struct l2cap_ctrl control; |
| u16 initial_head; |
| u16 seq; |
| |
| BT_DBG("chan %p, txseq %u", chan, txseq); |
| |
| memset(&control, 0, sizeof(control)); |
| control.sframe = 1; |
| control.super = L2CAP_SUPER_SREJ; |
| |
| /* Capture initial list head to allow only one pass through the list. */ |
| initial_head = chan->srej_list.head; |
| |
| do { |
| seq = l2cap_seq_list_pop(&chan->srej_list); |
| if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR) |
| break; |
| |
| control.reqseq = seq; |
| l2cap_send_sframe(chan, &control); |
| l2cap_seq_list_append(&chan->srej_list, seq); |
| } while (chan->srej_list.head != initial_head); |
| } |
| |
| static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq) |
| { |
| struct sk_buff *acked_skb; |
| u16 ackseq; |
| |
| BT_DBG("chan %p, reqseq %u", chan, reqseq); |
| |
| if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq) |
| return; |
| |
| BT_DBG("expected_ack_seq %u, unacked_frames %u", |
| chan->expected_ack_seq, chan->unacked_frames); |
| |
| for (ackseq = chan->expected_ack_seq; ackseq != reqseq; |
| ackseq = __next_seq(chan, ackseq)) { |
| |
| acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq); |
| if (acked_skb) { |
| skb_unlink(acked_skb, &chan->tx_q); |
| kfree_skb(acked_skb); |
| chan->unacked_frames--; |
| } |
| } |
| |
| chan->expected_ack_seq = reqseq; |
| |
| if (chan->unacked_frames == 0) |
| __clear_retrans_timer(chan); |
| |
| BT_DBG("unacked_frames %u", chan->unacked_frames); |
| } |
| |
| static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan) |
| { |
| BT_DBG("chan %p", chan); |
| |
| chan->expected_tx_seq = chan->buffer_seq; |
| l2cap_seq_list_clear(&chan->srej_list); |
| skb_queue_purge(&chan->srej_q); |
| chan->rx_state = L2CAP_RX_STATE_RECV; |
| } |
| |
| static void l2cap_tx_state_xmit(struct l2cap_chan *chan, |
| struct l2cap_ctrl *control, |
| struct sk_buff_head *skbs, u8 event) |
| { |
| BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, |
| event); |
| |
| switch (event) { |
| case L2CAP_EV_DATA_REQUEST: |
| if (chan->tx_send_head == NULL) |
| chan->tx_send_head = skb_peek(skbs); |
| |
| skb_queue_splice_tail_init(skbs, &chan->tx_q); |
| l2cap_ertm_send(chan); |
| break; |
| case L2CAP_EV_LOCAL_BUSY_DETECTED: |
| BT_DBG("Enter LOCAL_BUSY"); |
| set_bit(CONN_LOCAL_BUSY, &chan->conn_state); |
| |
| if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { |
| /* The SREJ_SENT state must be aborted if we are to |
| * enter the LOCAL_BUSY state. |
| */ |
| l2cap_abort_rx_srej_sent(chan); |
| } |
| |
| l2cap_send_ack(chan); |
| |
| break; |
| case L2CAP_EV_LOCAL_BUSY_CLEAR: |
| BT_DBG("Exit LOCAL_BUSY"); |
| clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); |
| |
| if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { |
| struct l2cap_ctrl local_control; |
| |
| memset(&local_control, 0, sizeof(local_control)); |
| local_control.sframe = 1; |
| local_control.super = L2CAP_SUPER_RR; |
| local_control.poll = 1; |
| local_control.reqseq = chan->buffer_seq; |
| l2cap_send_sframe(chan, &local_control); |
| |
| chan->retry_count = 1; |
| __set_monitor_timer(chan); |
| chan->tx_state = L2CAP_TX_STATE_WAIT_F; |
| } |
| break; |
| case L2CAP_EV_RECV_REQSEQ_AND_FBIT: |
| l2cap_process_reqseq(chan, control->reqseq); |
| break; |
| case L2CAP_EV_EXPLICIT_POLL: |
| l2cap_send_rr_or_rnr(chan, 1); |
| chan->retry_count = 1; |
| __set_monitor_timer(chan); |
| __clear_ack_timer(chan); |
| chan->tx_state = L2CAP_TX_STATE_WAIT_F; |
| break; |
| case L2CAP_EV_RETRANS_TO: |
| l2cap_send_rr_or_rnr(chan, 1); |
| chan->retry_count = 1; |
| __set_monitor_timer(chan); |
| chan->tx_state = L2CAP_TX_STATE_WAIT_F; |
| break; |
| case L2CAP_EV_RECV_FBIT: |
| /* Nothing to process */ |
| break; |
| default: |
| break; |
| } |
| } |
| |
| static void l2cap_tx_state_wait_f(struct l2cap_chan *chan, |
| struct l2cap_ctrl *control, |
| struct sk_buff_head *skbs, u8 event) |
| { |
| BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, |
| event); |
| |
| switch (event) { |
| case L2CAP_EV_DATA_REQUEST: |
| if (chan->tx_send_head == NULL) |
| chan->tx_send_head = skb_peek(skbs); |
| /* Queue data, but don't send. */ |
| skb_queue_splice_tail_init(skbs, &chan->tx_q); |
| break; |
| case L2CAP_EV_LOCAL_BUSY_DETECTED: |
| BT_DBG("Enter LOCAL_BUSY"); |
| set_bit(CONN_LOCAL_BUSY, &chan->conn_state); |
| |
| if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { |
| /* The SREJ_SENT state must be aborted if we are to |
| * enter the LOCAL_BUSY state. |
| */ |
| l2cap_abort_rx_srej_sent(chan); |
| } |
| |
| l2cap_send_ack(chan); |
| |
| break; |
| case L2CAP_EV_LOCAL_BUSY_CLEAR: |
| BT_DBG("Exit LOCAL_BUSY"); |
| clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); |
| |
| if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { |
| struct l2cap_ctrl local_control; |
| memset(&local_control, 0, sizeof(local_control)); |
| local_control.sframe = 1; |
| local_control.super = L2CAP_SUPER_RR; |
| local_control.poll = 1; |
| local_control.reqseq = chan->buffer_seq; |
| l2cap_send_sframe(chan, &local_control); |
| |
| chan->retry_count = 1; |
| __set_monitor_timer(chan); |
| chan->tx_state = L2CAP_TX_STATE_WAIT_F; |
| } |
| break; |
| case L2CAP_EV_RECV_REQSEQ_AND_FBIT: |
| l2cap_process_reqseq(chan, control->reqseq); |
| |
| /* Fall through */ |
| |
| case L2CAP_EV_RECV_FBIT: |
| if (control && control->final) { |
| __clear_monitor_timer(chan); |
| if (chan->unacked_frames > 0) |
| __set_retrans_timer(chan); |
| chan->retry_count = 0; |
| chan->tx_state = L2CAP_TX_STATE_XMIT; |
| BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state); |
| } |
| break; |
| case L2CAP_EV_EXPLICIT_POLL: |
| /* Ignore */ |
| break; |
| case L2CAP_EV_MONITOR_TO: |
| if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) { |
| l2cap_send_rr_or_rnr(chan, 1); |
| __set_monitor_timer(chan); |
| chan->retry_count++; |
| } else { |
| l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); |
| } |
| break; |
| default: |
| break; |
| } |
| } |
| |
| static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
| struct sk_buff_head *skbs, u8 event) |
| { |
| BT_DBG("chan %p, control %p, skbs %p, event %d, state %d", |
| chan, control, skbs, event, chan->tx_state); |
| |
| switch (chan->tx_state) { |
| case L2CAP_TX_STATE_XMIT: |
| l2cap_tx_state_xmit(chan, control, skbs, event); |
| break; |
| case L2CAP_TX_STATE_WAIT_F: |
| l2cap_tx_state_wait_f(chan, control, skbs, event); |
| break; |
| default: |
| /* Ignore event */ |
| break; |
| } |
| } |
| |
| static void l2cap_pass_to_tx(struct l2cap_chan *chan, |
| struct l2cap_ctrl *control) |
| { |
| BT_DBG("chan %p, control %p", chan, control); |
| l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_REQSEQ_AND_FBIT); |
| } |
| |
| static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan, |
| struct l2cap_ctrl *control) |
| { |
| BT_DBG("chan %p, control %p", chan, control); |
| l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_FBIT); |
| } |
| |
| /* Copy frame to all raw sockets on that connection */ |
| static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) |
| { |
| struct sk_buff *nskb; |
| struct l2cap_chan *chan; |
| |
| BT_DBG("conn %p", conn); |
| |
| mutex_lock(&conn->chan_lock); |
| |
| list_for_each_entry(chan, &conn->chan_l, list) { |
| struct sock *sk = chan->sk; |
| if (chan->chan_type != L2CAP_CHAN_RAW) |
| continue; |
| |
| /* Don't send frame to the socket it came from */ |
| if (skb->sk == sk) |
| continue; |
| nskb = skb_clone(skb, GFP_KERNEL); |
| if (!nskb) |
| continue; |
| |
| if (chan->ops->recv(chan, nskb)) |
| kfree_skb(nskb); |
| } |
| |
| mutex_unlock(&conn->chan_lock); |
| } |
| |
| /* ---- L2CAP signalling commands ---- */ |
| static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code, |
| u8 ident, u16 dlen, void *data) |
| { |
| struct sk_buff *skb, **frag; |
| struct l2cap_cmd_hdr *cmd; |
| struct l2cap_hdr *lh; |
| int len, count; |
| |
| BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %u", |
| conn, code, ident, dlen); |
| |
| len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; |
| count = min_t(unsigned int, conn->mtu, len); |
| |
| skb = bt_skb_alloc(count, GFP_KERNEL); |
| if (!skb) |
| return NULL; |
| |
| lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); |
| lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
| |
| if (conn->hcon->type == LE_LINK) |
| lh->cid = __constant_cpu_to_le16(L2CAP_CID_LE_SIGNALING); |
| else |
| lh->cid = __constant_cpu_to_le16(L2CAP_CID_SIGNALING); |
| |
| cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); |
| cmd->code = code; |
| cmd->ident = ident; |
| cmd->len = cpu_to_le16(dlen); |
| |
| if (dlen) { |
| count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; |
| memcpy(skb_put(skb, count), data, count); |
| data += count; |
| } |
| |
| len -= skb->len; |
| |
| /* Continuation fragments (no L2CAP header) */ |
| frag = &skb_shinfo(skb)->frag_list; |
| while (len) { |
| count = min_t(unsigned int, conn->mtu, len); |
| |
| *frag = bt_skb_alloc(count, GFP_KERNEL); |
| if (!*frag) |
| goto fail; |
| |
| memcpy(skb_put(*frag, count), data, count); |
| |
| len -= count; |
| data += count; |
| |
| frag = &(*frag)->next; |
| } |
| |
| return skb; |
| |
| fail: |
| kfree_skb(skb); |
| return NULL; |
| } |
| |
| static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, |
| unsigned long *val) |
| { |
| struct l2cap_conf_opt *opt = *ptr; |
| int len; |
| |
| len = L2CAP_CONF_OPT_SIZE + opt->len; |
| *ptr += len; |
| |
| *type = opt->type; |
| *olen = opt->len; |
| |
| switch (opt->len) { |
| case 1: |
| *val = *((u8 *) opt->val); |
| break; |
| |
| case 2: |
| *val = get_unaligned_le16(opt->val); |
| break; |
| |
| case 4: |
| *val = get_unaligned_le32(opt->val); |
| break; |
| |
| default: |
| *val = (unsigned long) opt->val; |
| break; |
| } |
| |
| BT_DBG("type 0x%2.2x len %u val 0x%lx", *type, opt->len, *val); |
| return len; |
| } |
| |
| static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
| { |
| struct l2cap_conf_opt *opt = *ptr; |
| |
| BT_DBG("type 0x%2.2x len %u val 0x%lx", type, len, val); |
| |
| opt->type = type; |
| opt->len = len; |
| |
| switch (len) { |
| case 1: |
| *((u8 *) opt->val) = val; |
| break; |
| |
| case 2: |
| put_unaligned_le16(val, opt->val); |
| break; |
| |
| case 4: |
| put_unaligned_le32(val, opt->val); |
| break; |
| |
| default: |
| memcpy(opt->val, (void *) val, len); |
| break; |
| } |
| |
| *ptr += L2CAP_CONF_OPT_SIZE + len; |
| } |
| |
| static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan) |
| { |
| struct l2cap_conf_efs efs; |
| |
| switch (chan->mode) { |
| case L2CAP_MODE_ERTM: |
| efs.id = chan->local_id; |
| efs.stype = chan->local_stype; |
| efs.msdu = cpu_to_le16(chan->local_msdu); |
| efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); |
| efs.acc_lat = __constant_cpu_to_le32(L2CAP_DEFAULT_ACC_LAT); |
| efs.flush_to = __constant_cpu_to_le32(L2CAP_EFS_DEFAULT_FLUSH_TO); |
| break; |
| |
| case L2CAP_MODE_STREAMING: |
| efs.id = 1; |
| efs.stype = L2CAP_SERV_BESTEFFORT; |
| efs.msdu = cpu_to_le16(chan->local_msdu); |
| efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); |
| efs.acc_lat = 0; |
| efs.flush_to = 0; |
| break; |
| |
| default: |
| return; |
| } |
| |
| l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs), |
| (unsigned long) &efs); |
| } |
| |
| static void l2cap_ack_timeout(struct work_struct *work) |
| { |
| struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
| ack_timer.work); |
| u16 frames_to_ack; |
| |
| BT_DBG("chan %p", chan); |
| |
| l2cap_chan_lock(chan); |
| |
| frames_to_ack = __seq_offset(chan, chan->buffer_seq, |
| chan->last_acked_seq); |
| |
| if (frames_to_ack) |
| l2cap_send_rr_or_rnr(chan, 0); |
| |
| l2cap_chan_unlock(chan); |
| l2cap_chan_put(chan); |
| } |
| |
| int l2cap_ertm_init(struct l2cap_chan *chan) |
| { |
| int err; |
| |
| chan->next_tx_seq = 0; |
| chan->expected_tx_seq = 0; |
| chan->expected_ack_seq = 0; |
| chan->unacked_frames = 0; |
| chan->buffer_seq = 0; |
| chan->frames_sent = 0; |
| chan->last_acked_seq = 0; |
| chan->sdu = NULL; |
| chan->sdu_last_frag = NULL; |
| chan->sdu_len = 0; |
| |
| skb_queue_head_init(&chan->tx_q); |
| |
| chan->local_amp_id = 0; |
| chan->move_id = 0; |
| chan->move_state = L2CAP_MOVE_STABLE; |
| chan->move_role = L2CAP_MOVE_ROLE_NONE; |
| |
| if (chan->mode != L2CAP_MODE_ERTM) |
| return 0; |
| |
| chan->rx_state = L2CAP_RX_STATE_RECV; |
| chan->tx_state = L2CAP_TX_STATE_XMIT; |
| |
| INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout); |
| INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout); |
| INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout); |
| |
| skb_queue_head_init(&chan->srej_q); |
| |
| err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win); |
| if (err < 0) |
| return err; |
| |
| err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win); |
| if (err < 0) |
| l2cap_seq_list_free(&chan->srej_list); |
| |
| return err; |
| } |
| |
| static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) |
| { |
| switch (mode) { |
| case L2CAP_MODE_STREAMING: |
| case L2CAP_MODE_ERTM: |
| if (l2cap_mode_supported(mode, remote_feat_mask)) |
| return mode; |
| /* fall through */ |
| default: |
| return L2CAP_MODE_BASIC; |
| } |
| } |
| |
| static inline bool __l2cap_ews_supported(struct l2cap_chan *chan) |
| { |
| return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_WINDOW; |
| } |
| |
| static inline bool __l2cap_efs_supported(struct l2cap_chan *chan) |
| { |
| return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_FLOW; |
| } |
| |
| static void __l2cap_set_ertm_timeouts(struct l2cap_chan *chan, |
| struct l2cap_conf_rfc *rfc) |
| { |
| if (chan->local_amp_id && chan->hs_hcon) { |
| u64 ertm_to = chan->hs_hcon->hdev->amp_be_flush_to; |
| |
| /* Class 1 devices have must have ERTM timeouts |
| * exceeding the Link Supervision Timeout. The |
| * default Link Supervision Timeout for AMP |
| * controllers is 10 seconds. |
| * |
| * Class 1 devices use 0xffffffff for their |
| * best-effort flush timeout, so the clamping logic |
| * will result in a timeout that meets the above |
| * requirement. ERTM timeouts are 16-bit values, so |
| * the maximum timeout is 65.535 seconds. |
| */ |
| |
| /* Convert timeout to milliseconds and round */ |
| ertm_to = DIV_ROUND_UP_ULL(ertm_to, 1000); |
| |
| /* This is the recommended formula for class 2 devices |
| * that start ERTM timers when packets are sent to the |
| * controller. |
| */ |
| ertm_to = 3 * ertm_to + 500; |
| |
| if (ertm_to > 0xffff) |
| ertm_to = 0xffff; |
| |
| rfc->retrans_timeout = cpu_to_le16((u16) ertm_to); |
| rfc->monitor_timeout = rfc->retrans_timeout; |
| } else { |
| rfc->retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO); |
| rfc->monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO); |
| } |
| } |
| |
| static inline void l2cap_txwin_setup(struct l2cap_chan *chan) |
| { |
| if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW && |
| __l2cap_ews_supported(chan)) { |
| /* use extended control field */ |
| set_bit(FLAG_EXT_CTRL, &chan->flags); |
| chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
| } else { |
| chan->tx_win = min_t(u16, chan->tx_win, |
| L2CAP_DEFAULT_TX_WINDOW); |
| chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; |
| } |
| chan->ack_win = chan->tx_win; |
| } |
| |
| static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data) |
| { |
| struct l2cap_conf_req *req = data; |
| struct l2cap_conf_rfc rfc = { .mode = chan->mode }; |
| void *ptr = req->data; |
| u16 size; |
| |
| BT_DBG("chan %p", chan); |
| |
| if (chan->num_conf_req || chan->num_conf_rsp) |
| goto done; |
| |
| switch (chan->mode) { |
| case L2CAP_MODE_STREAMING: |
| case L2CAP_MODE_ERTM: |
| if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) |
| break; |
| |
| if (__l2cap_efs_supported(chan)) |
| set_bit(FLAG_EFS_ENABLE, &chan->flags); |
| |
| /* fall through */ |
| default: |
| chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask); |
| break; |
| } |
| |
| done: |
| if (chan->imtu != L2CAP_DEFAULT_MTU) |
| l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); |
| |
| switch (chan->mode) { |
| case L2CAP_MODE_BASIC: |
| if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) && |
| !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING)) |
| break; |
| |
| rfc.mode = L2CAP_MODE_BASIC; |
| rfc.txwin_size = 0; |
| rfc.max_transmit = 0; |
| rfc.retrans_timeout = 0; |
| rfc.monitor_timeout = 0; |
| rfc.max_pdu_size = 0; |
| |
| l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
| (unsigned long) &rfc); |
| break; |
| |
| case L2CAP_MODE_ERTM: |
| rfc.mode = L2CAP_MODE_ERTM; |
| rfc.max_transmit = chan->max_tx; |
| |
| __l2cap_set_ertm_timeouts(chan, &rfc); |
| |
| size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - |
| L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE - |
| L2CAP_FCS_SIZE); |
| rfc.max_pdu_size = cpu_to_le16(size); |
| |
| l2cap_txwin_setup(chan); |
| |
| rfc.txwin_size = min_t(u16, chan->tx_win, |
| L2CAP_DEFAULT_TX_WINDOW); |
| |
| l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
| (unsigned long) &rfc); |
| |
| if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
| l2cap_add_opt_efs(&ptr, chan); |
| |
| if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
| break; |
| |
| if (chan->fcs == L2CAP_FCS_NONE || |
| test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { |
| chan->fcs = L2CAP_FCS_NONE; |
| l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); |
| } |
| |
| if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
| l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, |
| chan->tx_win); |
| break; |
| |
| case L2CAP_MODE_STREAMING: |
| l2cap_txwin_setup(chan); |
| rfc.mode = L2CAP_MODE_STREAMING; |
| rfc.txwin_size = 0; |
| rfc.max_transmit = 0; |
| rfc.retrans_timeout = 0; |
| rfc.monitor_timeout = 0; |
| |
| size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - |
| L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE - |
| L2CAP_FCS_SIZE); |
| rfc.max_pdu_size = cpu_to_le16(size); |
| |
| l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
| (unsigned long) &rfc); |
| |
| if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
| l2cap_add_opt_efs(&ptr, chan); |
| |
| if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
| break; |
| |
| if (chan->fcs == L2CAP_FCS_NONE || |
| test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { |
| chan->fcs = L2CAP_FCS_NONE; |
| l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); |
| } |
| break; |
| } |
| |
| req->dcid = cpu_to_le16(chan->dcid); |
| req->flags = __constant_cpu_to_le16(0); |
| |
| return ptr - data; |
| } |
| |
| static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data) |
| { |
| struct l2cap_conf_rsp *rsp = data; |
| void *ptr = rsp->data; |
| void *req = chan->conf_req; |
| int len = chan->conf_len; |
| int type, hint, olen; |
| unsigned long val; |
| struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
| struct l2cap_conf_efs efs; |
| u8 remote_efs = 0; |
| u16 mtu = L2CAP_DEFAULT_MTU; |
| u16 result = L2CAP_CONF_SUCCESS; |
| u16 size; |
| |
| BT_DBG("chan %p", chan); |
| |
| while (len >= L2CAP_CONF_OPT_SIZE) { |
| len -= l2cap_get_conf_opt(&req, &type, &olen, &val); |
| |
| hint = type & L2CAP_CONF_HINT; |
| type &= L2CAP_CONF_MASK; |
| |
| switch (type) { |
| case L2CAP_CONF_MTU: |
| mtu = val; |
| break; |
| |
| case L2CAP_CONF_FLUSH_TO: |
| chan->flush_to = val; |
| break; |
| |
| case L2CAP_CONF_QOS: |
| break; |
| |
| case L2CAP_CONF_RFC: |
| if (olen == sizeof(rfc)) |
| memcpy(&rfc, (void *) val, olen); |
| break; |
| |
| case L2CAP_CONF_FCS: |
| if (val == L2CAP_FCS_NONE) |
| set_bit(CONF_NO_FCS_RECV, &chan->conf_state); |
| break; |
| |
| case L2CAP_CONF_EFS: |
| remote_efs = 1; |
| if (olen == sizeof(efs)) |
| memcpy(&efs, (void *) val, olen); |
| break; |
| |
| case L2CAP_CONF_EWS: |
| if (!enable_hs) |
| return -ECONNREFUSED; |
| |
| set_bit(FLAG_EXT_CTRL, &chan->flags); |
| set_bit(CONF_EWS_RECV, &chan->conf_state); |
| chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
| chan->remote_tx_win = val; |
| break; |
| |
| default: |
| if (hint) |
| break; |
| |
| result = L2CAP_CONF_UNKNOWN; |
| *((u8 *) ptr++) = type; |
| break; |
| } |
| } |
| |
| if (chan->num_conf_rsp || chan->num_conf_req > 1) |
| goto done; |
| |
| switch (chan->mode) { |
| case L2CAP_MODE_STREAMING: |
| case L2CAP_MODE_ERTM: |
| if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) { |
| chan->mode = l2cap_select_mode(rfc.mode, |
| chan->conn->feat_mask); |
| break; |
| } |
| |
| if (remote_efs) { |
| if (__l2cap_efs_supported(chan)) |
| set_bit(FLAG_EFS_ENABLE, &chan->flags); |
| else |
| return -ECONNREFUSED; |
| } |
| |
| if (chan->mode != rfc.mode) |
| return -ECONNREFUSED; |
| |
| break; |
| } |
| |
| done: |
| if (chan->mode != rfc.mode) { |
| result = L2CAP_CONF_UNACCEPT; |
| rfc.mode = chan->mode; |
| |
| if (chan->num_conf_rsp == 1) |
| return -ECONNREFUSED; |
| |
| l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
| (unsigned long) &rfc); |
| } |
| |
| if (result == L2CAP_CONF_SUCCESS) { |
| /* Configure output options and let the other side know |
| * which ones we don't like. */ |
| |
| if (mtu < L2CAP_DEFAULT_MIN_MTU) |
| result = L2CAP_CONF_UNACCEPT; |
| else { |
| chan->omtu = mtu; |
| set_bit(CONF_MTU_DONE, &chan->conf_state); |
| } |
| l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu); |
| |
| if (remote_efs) { |
| if (chan->local_stype != L2CAP_SERV_NOTRAFIC && |
| efs.stype != L2CAP_SERV_NOTRAFIC && |
| efs.stype != chan->local_stype) { |
| |
| result = L2CAP_CONF_UNACCEPT; |
| |
| if (chan->num_conf_req >= 1) |
| return -ECONNREFUSED; |
| |
| l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, |
| sizeof(efs), |
| (unsigned long) &efs); |
| } else { |
| /* Send PENDING Conf Rsp */ |
| result = L2CAP_CONF_PENDING; |
| set_bit(CONF_LOC_CONF_PEND, &chan->conf_state); |
| } |
| } |
| |
| switch (rfc.mode) { |
| case L2CAP_MODE_BASIC: |
| chan->fcs = L2CAP_FCS_NONE; |
| set_bit(CONF_MODE_DONE, &chan->conf_state); |
| break; |
| |
| case L2CAP_MODE_ERTM: |
| if (!test_bit(CONF_EWS_RECV, &chan->conf_state)) |
| chan->remote_tx_win = rfc.txwin_size; |
| else |
| rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW; |
| |
| chan->remote_max_tx = rfc.max_transmit; |
| |
| size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
| chan->conn->mtu - L2CAP_EXT_HDR_SIZE - |
| L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE); |
| rfc.max_pdu_size = cpu_to_le16(size); |
| chan->remote_mps = size; |
| |
| __l2cap_set_ertm_timeouts(chan, &rfc); |
| |
| set_bit(CONF_MODE_DONE, &chan->conf_state); |
| |
| l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, |
| sizeof(rfc), (unsigned long) &rfc); |
| |
| if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { |
| chan->remote_id = efs.id; |
| chan->remote_stype = efs.stype; |
| chan->remote_msdu = le16_to_cpu(efs.msdu); |
| chan->remote_flush_to = |
| le32_to_cpu(efs.flush_to); |
| chan->remote_acc_lat = |
| le32_to_cpu(efs.acc_lat); |
| chan->remote_sdu_itime = |
| le32_to_cpu(efs.sdu_itime); |
| l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, |
| sizeof(efs), |
| (unsigned long) &efs); |
| } |
| break; |
| |
| case L2CAP_MODE_STREAMING: |
| size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
| chan->conn->mtu - L2CAP_EXT_HDR_SIZE - |
| L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE); |
| rfc.max_pdu_size = cpu_to_le16(size); |
| chan->remote_mps = size; |
| |
| set_bit(CONF_MODE_DONE, &chan->conf_state); |
| |
| l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
| (unsigned long) &rfc); |
| |
| break; |
| |
| default: |
| result = L2CAP_CONF_UNACCEPT; |
| |
| memset(&rfc, 0, sizeof(rfc)); |
| rfc.mode = chan->mode; |
| } |
| |
| if (result == L2CAP_CONF_SUCCESS) |
| set_bit(CONF_OUTPUT_DONE, &chan->conf_state); |
| } |
| rsp->scid = cpu_to_le16(chan->dcid); |
| rsp->result = cpu_to_le16(result); |
| rsp->flags = __constant_cpu_to_le16(0); |
| |
| return ptr - data; |
| } |
| |
| static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, |
| void *data, u16 *result) |
| { |
| struct l2cap_conf_req *req = data; |
| void *ptr = req->data; |
| int type, olen; |
| unsigned long val; |
| struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
| struct l2cap_conf_efs efs; |
| |
| BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data); |
| |
| while (len >= L2CAP_CONF_OPT_SIZE) { |
| len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); |
| |
| switch (type) { |
| case L2CAP_CONF_MTU: |
| if (val < L2CAP_DEFAULT_MIN_MTU) { |
| *result = L2CAP_CONF_UNACCEPT; |
| chan->imtu = L2CAP_DEFAULT_MIN_MTU; |
| } else |
| chan->imtu = val; |
| l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); |
| break; |
| |
| case L2CAP_CONF_FLUSH_TO: |
| chan->flush_to = val; |
| l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, |
| 2, chan->flush_to); |
| break; |
| |
| case L2CAP_CONF_RFC: |
| if (olen == sizeof(rfc)) |
| memcpy(&rfc, (void *)val, olen); |
| |
| if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) && |
| rfc.mode != chan->mode) |
| return -ECONNREFUSED; |
| |
| chan->fcs = 0; |
| |
| l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, |
| sizeof(rfc), (unsigned long) &rfc); |
| break; |
| |
| case L2CAP_CONF_EWS: |
| chan->ack_win = min_t(u16, val, chan->ack_win); |
| l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, |
| chan->tx_win); |
| break; |
| |
| case L2CAP_CONF_EFS: |
| if (olen == sizeof(efs)) |
| memcpy(&efs, (void *)val, olen); |
| |
| if (chan->local_stype != L2CAP_SERV_NOTRAFIC && |
| efs.stype != L2CAP_SERV_NOTRAFIC && |
| efs.stype != chan->local_stype) |
| return -ECONNREFUSED; |
| |
| l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, sizeof(efs), |
| (unsigned long) &efs); |
| break; |
| } |
| } |
| |
| if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode) |
| return -ECONNREFUSED; |
| |
| chan->mode = rfc.mode; |
| |
| if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) { |
| switch (rfc.mode) { |
| case L2CAP_MODE_ERTM: |
| chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
| chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); |
| chan->mps = le16_to_cpu(rfc.max_pdu_size); |
| if (!test_bit(FLAG_EXT_CTRL, &chan->flags)) |
| chan->ack_win = min_t(u16, chan->ack_win, |
| rfc.txwin_size); |
| |
| if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { |
| chan->local_msdu = le16_to_cpu(efs.msdu); |
| chan->local_sdu_itime = |
| le32_to_cpu(efs.sdu_itime); |
| chan->local_acc_lat = le32_to_cpu(efs.acc_lat); |
| chan->local_flush_to = |
| le32_to_cpu(efs.flush_to); |
| } |
| break; |
| |
| case L2CAP_MODE_STREAMING: |
| chan->mps = le16_to_cpu(rfc.max_pdu_size); |
| } |
| } |
| |
| req->dcid = cpu_to_le16(chan->dcid); |
| req->flags = __constant_cpu_to_le16(0); |
| |
| return ptr - data; |
| } |
| |
| static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, |
| u16 result, u16 flags) |
| { |
| struct l2cap_conf_rsp *rsp = data; |
| void *ptr = rsp->data; |
| |
| BT_DBG("chan %p", chan); |
| |
| rsp->scid = cpu_to_le16(chan->dcid); |
| rsp->result = cpu_to_le16(result); |
| rsp->flags = cpu_to_le16(flags); |
| |
| return ptr - data; |
| } |
| |
| void __l2cap_connect_rsp_defer(struct l2cap_chan *chan) |
| { |
| struct l2cap_conn_rsp rsp; |
| struct l2cap_conn *conn = chan->conn; |
| u8 buf[128]; |
| u8 rsp_code; |
| |
| rsp.scid = cpu_to_le16(chan->dcid); |
| rsp.dcid = cpu_to_le16(chan->scid); |
| rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS); |
| rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); |
| |
| if (chan->hs_hcon) |
| rsp_code = L2CAP_CREATE_CHAN_RSP; |
| else |
| rsp_code = L2CAP_CONN_RSP; |
| |
| BT_DBG("chan %p rsp_code %u", chan, rsp_code); |
| |
| l2cap_send_cmd(conn, chan->ident, rsp_code, sizeof(rsp), &rsp); |
| |
| if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
| return; |
| |
| l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
| l2cap_build_conf_req(chan, buf), buf); |
| chan->num_conf_req++; |
| } |
| |
| static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len) |
| { |
| int type, olen; |
| unsigned long val; |
| /* Use sane default values in case a misbehaving remote device |
| * did not send an RFC or extended window size option. |
| */ |
| u16 txwin_ext = chan->ack_win; |
| struct l2cap_conf_rfc rfc = { |
| .mode = chan->mode, |
| .retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO), |
| .monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO), |
| .max_pdu_size = cpu_to_le16(chan->imtu), |
| .txwin_size = min_t(u16, chan->ack_win, L2CAP_DEFAULT_TX_WINDOW), |
| }; |
| |
| BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len); |
| |
| if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING)) |
| return; |
| |
| while (len >= L2CAP_CONF_OPT_SIZE) { |
| len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); |
| |
| switch (type) { |
| case L2CAP_CONF_RFC: |
| if (olen == sizeof(rfc)) |
| memcpy(&rfc, (void *)val, olen); |
| break; |
| case L2CAP_CONF_EWS: |
| txwin_ext = val; |
| break; |
| } |
| } |
| |
| switch (rfc.mode) { |
| case L2CAP_MODE_ERTM: |
| chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
| chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); |
| chan->mps = le16_to_cpu(rfc.max_pdu_size); |
| if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
| chan->ack_win = min_t(u16, chan->ack_win, txwin_ext); |
| else |
| chan->ack_win = min_t(u16, chan->ack_win, |
| rfc.txwin_size); |
| break; |
| case L2CAP_MODE_STREAMING: |
| chan->mps = le16_to_cpu(rfc.max_pdu_size); |
| } |
| } |
| |
| static inline int l2cap_command_rej(struct l2cap_conn *conn, |
| struct l2cap_cmd_hdr *cmd, u8 *data) |
| { |
| struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data; |
| |
| if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD) |
| return 0; |
| |
| if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && |
| cmd->ident == conn->info_ident) { |
| cancel_delayed_work(&conn->info_timer); |
| |
| conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
| conn->info_ident = 0; |
| |
| l2cap_conn_start(conn); |
| } |
| |
| return 0; |
| } |
| |
| static struct l2cap_chan *l2cap_connect(struct l2cap_conn *conn, |
| struct l2cap_cmd_hdr *cmd, |
| u8 *data, u8 rsp_code, u8 amp_id) |
| { |
| struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; |
| struct l2cap_conn_rsp rsp; |
| struct l2cap_chan *chan = NULL, *pchan; |
| struct sock *parent, *sk = NULL; |
| int result, status = L2CAP_CS_NO_INFO; |
| |
| u16 dcid = 0, scid = __le16_to_cpu(req->scid); |
| __le16 psm = req->psm; |
| |
| BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid); |
| |
| /* Check if we have socket listening on psm */ |
| pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src, conn->dst); |
| if (!pchan) { |
| result = L2CAP_CR_BAD_PSM; |
| goto sendresp; |
| } |
| |
| parent = pchan->sk; |
| |
| mutex_lock(&conn->chan_lock); |
| lock_sock(parent); |
| |
| /* Check if the ACL is secure enough (if not SDP) */ |
| if (psm != __constant_cpu_to_le16(L2CAP_PSM_SDP) && |
| !hci_conn_check_link_mode(conn->hcon)) { |
| conn->disc_reason = HCI_ERROR_AUTH_FAILURE; |
| result = L2CAP_CR_SEC_BLOCK; |
| goto response; |
| } |
| |
| result = L2CAP_CR_NO_MEM; |
| |
| /* Check if we already have channel with that dcid */ |
| if (__l2cap_get_chan_by_dcid(conn, scid)) |
| goto response; |
| |
| chan = pchan->ops->new_connection(pchan); |
| if (!chan) |
| goto response; |
| |
| sk = chan->sk; |
| |
| hci_conn_hold(conn->hcon); |
| |
| bacpy(&bt_sk(sk)->src, conn->src); |
| bacpy(&bt_sk(sk)->dst, conn->dst); |
| chan->psm = psm; |
| chan->dcid = scid; |
| chan->local_amp_id = amp_id; |
| |
| __l2cap_chan_add(conn, chan); |
| |
| dcid = chan->scid; |
| |
| __set_chan_timer(chan, sk->sk_sndtimeo); |
| |
| chan->ident = cmd->ident; |
| |
| if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
| if (l2cap_chan_check_security(chan)) { |
| if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) { |
| __l2cap_state_change(chan, BT_CONNECT2); |
| result = L2CAP_CR_PEND; |
| status = L2CAP_CS_AUTHOR_PEND; |
| chan->ops->defer(chan); |
| } else { |
| /* Force pending result for AMP controllers. |
| * The connection will succeed after the |
| * physical link is up. |
| */ |
| if (amp_id) { |
| __l2cap_state_change(chan, BT_CONNECT2); |
| result = L2CAP_CR_PEND; |
| } else { |
| __l2cap_state_change(chan, BT_CONFIG); |
| result = L2CAP_CR_SUCCESS; |
| } |
| status = L2CAP_CS_NO_INFO; |
| } |
| } else { |
| __l2cap_state_change(chan, BT_CONNECT2); |
| result = L2CAP_CR_PEND; |
| status = L2CAP_CS_AUTHEN_PEND; |
| } |
| } else { |
| __l2cap_state_change(chan, BT_CONNECT2); |
| result = L2CAP_CR_PEND; |
| status = L2CAP_CS_NO_INFO; |
| } |
| |
| response: |
| release_sock(parent); |
| mutex_unlock(&conn->chan_lock); |
| |
| sendresp: |
| rsp.scid = cpu_to_le16(scid); |
| rsp.dcid = cpu_to_le16(dcid); |
| rsp.result = cpu_to_le16(result); |
| rsp.status = cpu_to_le16(status); |
| l2cap_send_cmd(conn, cmd->ident, rsp_code, sizeof(rsp), &rsp); |
| |
| if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { |
| struct l2cap_info_req info; |
| info.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); |
| |
| conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; |
| conn->info_ident = l2cap_get_ident(conn); |
| |
| schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); |
| |
| l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ, |
| sizeof(info), &info); |
| } |
| |
| if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) && |
| result == L2CAP_CR_SUCCESS) { |
| u8 buf[128]; |
| set_bit(CONF_REQ_SENT, &chan->conf_state); |
| l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
| l2cap_build_conf_req(chan, buf), buf); |
| chan->num_conf_req++; |
| } |
| |
| return chan; |
| } |
| |
| static int l2cap_connect_req(struct l2cap_conn *conn, |
| struct l2cap_cmd_hdr *cmd, u8 *data) |
| { |
| l2cap_connect(conn, cmd, data, L2CAP_CONN_RSP, 0); |
| return 0; |
| } |
| |
| static int l2cap_connect_create_rsp(struct l2cap_conn *conn, |
| struct l2cap_cmd_hdr *cmd, u8 *data) |
| { |
| struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; |
| u16 scid, dcid, result, status; |
| struct l2cap_chan *chan; |
| u8 req[128]; |
| int err; |
| |
| scid = __le16_to_cpu(rsp->scid); |
| dcid = __le16_to_cpu(rsp->dcid); |
| result = __le16_to_cpu(rsp->result); |
| status = __le16_to_cpu(rsp->status); |
| |
| BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", |
| dcid, scid, result, status); |
| |
| mutex_lock(&conn->chan_lock); |
| |
| if (scid) { |
| chan = __l2cap_get_chan_by_scid(conn, scid); |
| if (!chan) { |
| err = -EFAULT; |
| goto unlock; |
| } |
| } else { |
| chan = __l2cap_get_chan_by_ident(conn, cmd->ident); |
| if (!chan) { |
| err = -EFAULT; |
| goto unlock; |
| } |
| } |
| |
| err = 0; |
| |
| l2cap_chan_lock(chan); |
| |
| switch (result) { |
| case L2CAP_CR_SUCCESS: |
| l2cap_state_change(chan, BT_CONFIG); |
| chan->ident = 0; |
| chan->dcid = dcid; |
| clear_bit(CONF_CONNECT_PEND, &chan->conf_state); |
| |
| if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
| break; |
| |
| l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
| l2cap_build_conf_req(chan, req), req); |
| chan->num_conf_req++; |
| break; |
| |
| case L2CAP_CR_PEND: |
| set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
| break; |
| |
| default: |
| l2cap_chan_del(chan, ECONNREFUSED); |
| break; |
| } |
| |
| l2cap_chan_unlock(chan); |
| |
| unlock: |
| mutex_unlock(&conn->chan_lock); |
| |
| return err; |
| } |
| |
| static inline void set_default_fcs(struct l2cap_chan *chan) |
| { |
| /* FCS is enabled only in ERTM or streaming mode, if one or both |
| * sides request it. |
| */ |
| if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING) |
| chan->fcs = L2CAP_FCS_NONE; |
| else if (!test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) |
| chan->fcs = L2CAP_FCS_CRC16; |
| } |
| |
| static void l2cap_send_efs_conf_rsp(struct l2cap_chan *chan, void *data, |
| u8 ident, u16 flags) |
| { |
| struct l2cap_conn *conn = chan->conn; |
| |
| BT_DBG("conn %p chan %p ident %d flags 0x%4.4x", conn, chan, ident, |
| flags); |
| |
| clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); |
| set_bit(CONF_OUTPUT_DONE, &chan->conf_state); |
| |
| l2cap_send_cmd(conn, ident, L2CAP_CONF_RSP, |
| l2cap_build_conf_rsp(chan, data, |
| L2CAP_CONF_SUCCESS, flags), data); |
| } |
| |
| static inline int l2cap_config_req(struct l2cap_conn *conn, |
| struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
| u8 *data) |
| { |
| struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; |
| u16 dcid, flags; |
| u8 rsp[64]; |
| struct l2cap_chan *chan; |
| int len, err = 0; |
| |
| dcid = __le16_to_cpu(req->dcid); |
| flags = __le16_to_cpu(req->flags); |
| |
| BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); |
| |
| chan = l2cap_get_chan_by_scid(conn, dcid); |
| if (!chan) |
| return -ENOENT; |
| |
| if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) { |
| struct l2cap_cmd_rej_cid rej; |
| |
| rej.reason = __constant_cpu_to_le16(L2CAP_REJ_INVALID_CID); |
| rej.scid = cpu_to_le16(chan->scid); |
| rej.dcid = cpu_to_le16(chan->dcid); |
| |
| l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, |
| sizeof(rej), &rej); |
| goto unlock; |
| } |
| |
| /* Reject if config buffer is too small. */ |
| len = cmd_len - sizeof(*req); |
| if (len < 0 || chan->conf_len + len > sizeof(chan->conf_req)) { |
| l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, |
| l2cap_build_conf_rsp(chan, rsp, |
| L2CAP_CONF_REJECT, flags), rsp); |
| goto unlock; |
| } |
| |
| /* Store config. */ |
| memcpy(chan->conf_req + chan->conf_len, req->data, len); |
| chan->conf_len += len; |
| |
| if (flags & L2CAP_CONF_FLAG_CONTINUATION) { |
| /* Incomplete config. Send empty response. */ |
| l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, |
| l2cap_build_conf_rsp(chan, rsp, |
| L2CAP_CONF_SUCCESS, flags), rsp); |
| goto unlock; |
| } |
| |
| /* Complete config. */ |
| len = l2cap_parse_conf_req(chan, rsp); |
| if (len < 0) { |
| l2cap_send_disconn_req(conn, chan, ECONNRESET); |
| goto unlock; |
| } |
| |
| chan->ident = cmd->ident; |
| l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
| chan->num_conf_rsp++; |
| |
| /* Reset config buffer. */ |
| chan->conf_len = 0; |
| |
| if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) |
| goto unlock; |
| |
| if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { |
| set_default_fcs(chan); |
| |
| if (chan->mode == L2CAP_MODE_ERTM || |
| chan->mode == L2CAP_MODE_STREAMING) |
| err = l2cap_ertm_init(chan); |
| |
| if (err < 0) |
| l2cap_send_disconn_req(chan->conn, chan, -err); |
| else |
| l2cap_chan_ready(chan); |
| |
| goto unlock; |
| } |
| |
| if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) { |
| u8 buf[64]; |
| l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
| l2cap_build_conf_req(chan, buf), buf); |
| chan->num_conf_req++; |
| } |
| |
| /* Got Conf Rsp PENDING from remote side and asume we sent |
| Conf Rsp PENDING in the code above */ |
| if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) && |
| test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { |
| |
| /* check compatibility */ |
| |
| /* Send rsp for BR/EDR channel */ |
| if (!chan->hs_hcon) |
| l2cap_send_efs_conf_rsp(chan, rsp, cmd->ident, flags); |
| else |
| chan->ident = cmd->ident; |
| } |
| |
| unlock: |
| l2cap_chan_unlock(chan); |
| return err; |
| } |
| |
| static inline int l2cap_config_rsp(struct l2cap_conn *conn, |
| struct l2cap_cmd_hdr *cmd, u8 *data) |
| { |
| struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; |
| u16 scid, flags, result; |
| struct l2cap_chan *chan; |
| int len = le16_to_cpu(cmd->len) - sizeof(*rsp); |
| int err = 0; |
| |
| scid = __le16_to_cpu(rsp->scid); |
| flags = __le16_to_cpu(rsp->flags); |
| result = __le16_to_cpu(rsp->result); |
| |
| BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags, |
| result, len); |
| |
| chan = l2cap_get_chan_by_scid(conn, scid); |
| if (!chan) |
| return 0; |
| |
| switch (result) { |
| case L2CAP_CONF_SUCCESS: |
| l2cap_conf_rfc_get(chan, rsp->data, len); |
| clear_bit(CONF_REM_CONF_PEND, &chan->conf_state); |
| break; |
| |
| case L2CAP_CONF_PENDING: |
| set_bit(CONF_REM_CONF_PEND, &chan->conf_state); |
| |
| if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { |
| char buf[64]; |
| |
| len = l2cap_parse_conf_rsp(chan, rsp->data, len, |
| buf, &result); |
| if (len < 0) { |
| l2cap_send_disconn_req(conn, chan, ECONNRESET); |
| goto done; |
| } |
| |
| if (!chan->hs_hcon) { |
| l2cap_send_efs_conf_rsp(chan, buf, cmd->ident, |
| 0); |
| } else { |
| if (l2cap_check_efs(chan)) { |
| amp_create_logical_link(chan); |
| chan->ident = cmd->ident; |
| } |
| } |
| } |
| goto done; |
| |
| case L2CAP_CONF_UNACCEPT: |
| if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
| char req[64]; |
| |
| if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
| l2cap_send_disconn_req(conn, chan, ECONNRESET); |
| goto done; |
| } |
| |
| /* throw out any old stored conf requests */ |
| result = L2CAP_CONF_SUCCESS; |
| len = l2cap_parse_conf_rsp(chan, rsp->data, len, |
| req, &result); |
| if (len < 0) { |
| l2cap_send_disconn_req(conn, chan, ECONNRESET); |
| goto done; |
| } |
| |
| l2cap_send_cmd(conn, l2cap_get_ident(conn), |
| L2CAP_CONF_REQ, len, req); |
| chan->num_conf_req++; |
| if (result != L2CAP_CONF_SUCCESS) |
| goto done; |
| break; |
| } |
| |
| default: |
| l2cap_chan_set_err(chan, ECONNRESET); |
| |
| __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT); |
| l2cap_send_disconn_req(conn, chan, ECONNRESET); |
| goto done; |
| } |
| |
| if (flags & L2CAP_CONF_FLAG_CONTINUATION) |
| goto done; |
| |
| set_bit(CONF_INPUT_DONE, &chan->conf_state); |
| |
| if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) { |
| set_default_fcs(chan); |
| |
| if (chan->mode == L2CAP_MODE_ERTM || |
| chan->mode == L2CAP_MODE_STREAMING) |
| err = l2cap_ertm_init(chan); |
| |
| if (err < 0) |
| l2cap_send_disconn_req(chan->conn, chan, -err); |
| else |
| l2cap_chan_ready(chan); |
| } |
| |
| done: |
| l2cap_chan_unlock(chan); |
| return err; |
| } |
| |
| static inline int l2cap_disconnect_req(struct l2cap_conn *conn, |
| struct l2cap_cmd_hdr *cmd, u8 *data) |
| { |
| struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; |
| struct l2cap_disconn_rsp rsp; |
| u16 dcid, scid; |
| struct l2cap_chan *chan; |
| struct sock *sk; |
| |
| scid = __le16_to_cpu(req->scid); |
| dcid = __le16_to_cpu(req->dcid); |
| |
| BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); |
| |
| mutex_lock(&conn->chan_lock); |
| |
| chan = __l2cap_get_chan_by_scid(conn, dcid); |
| if (!chan) { |
| mutex_unlock(&conn->chan_lock); |
| return 0; |
| } |
| |
| l2cap_chan_lock(chan); |
| |
| sk = chan->sk; |
| |
| rsp.dcid = cpu_to_le16(chan->scid); |
| rsp.scid = cpu_to_le16(chan->dcid); |
| l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
| |
| lock_sock(sk); |
| sk->sk_shutdown = SHUTDOWN_MASK; |
| release_sock(sk); |
| |
| l2cap_chan_hold(chan); |
| l2cap_chan_del(chan, ECONNRESET); |
| |
| l2cap_chan_unlock(chan); |
| |
| chan->ops->close(chan); |
| l2cap_chan_put(chan); |
| |
| mutex_unlock(&conn->chan_lock); |
| |
| return 0; |
| } |
| |
| static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, |
| struct l2cap_cmd_hdr *cmd, u8 *data) |
| { |
| struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; |
| u16 dcid, scid; |
| struct l2cap_chan *chan; |
| |
| scid = __le16_to_cpu(rsp->scid); |
| dcid = __le16_to_cpu(rsp->dcid); |
| |
| BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); |
| |
| mutex_lock(&conn->chan_lock); |
| |
| chan = __l2cap_get_chan_by_scid(conn, scid); |
| if (!chan) { |
| mutex_unlock(&conn->chan_lock); |
| return 0; |
| } |
| |
| l2cap_chan_lock(chan); |
| |
| l2cap_chan_hold(chan); |
| l2cap_chan_del(chan, 0); |
| |
| l2cap_chan_unlock(chan); |
| |
| chan->ops->close(chan); |
| l2cap_chan_put(chan); |
| |
| mutex_unlock(&conn->chan_lock); |
| |
| return 0; |
| } |
| |
| static inline int l2cap_information_req(struct l2cap_conn *conn, |
| struct l2cap_cmd_hdr *cmd, u8 *data) |
| { |
| struct l2cap_info_req *req = (struct l2cap_info_req *) data; |
| u16 type; |
| |
| type = __le16_to_cpu(req->type); |
| |
| BT_DBG("type 0x%4.4x", type); |
| |
| if (type == L2CAP_IT_FEAT_MASK) { |
| u8 buf[8]; |
| u32 feat_mask = l2cap_feat_mask; |
| struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
| rsp->type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); |
| rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS); |
| if (!disable_ertm) |
| feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
| | L2CAP_FEAT_FCS; |
| if (enable_hs) |
| feat_mask |= L2CAP_FEAT_EXT_FLOW |
| | L2CAP_FEAT_EXT_WINDOW; |
| |
| put_unaligned_le32(feat_mask, rsp->data); |
| l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf), |
| buf); |
| } else if (type == L2CAP_IT_FIXED_CHAN) { |
| u8 buf[12]; |
| struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
| |
| if (enable_hs) |
| l2cap_fixed_chan[0] |= L2CAP_FC_A2MP; |
| else |
| l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP; |
| |
| rsp->type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
| rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS); |
| memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan)); |
| l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf), |
| buf); |
| } else { |
| struct l2cap_info_rsp rsp; |
| rsp.type = cpu_to_le16(type); |
| rsp.result = __constant_cpu_to_le16(L2CAP_IR_NOTSUPP); |
| l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(rsp), |
| &rsp); |
| } |
| |
| return 0; |
| } |
| |
| static inline int l2cap_information_rsp(struct l2cap_conn *conn, |
| struct l2cap_cmd_hdr *cmd, u8 *data) |
| { |
| struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; |
| u16 type, result; |
| |
| type = __le16_to_cpu(rsp->type); |
| result = __le16_to_cpu(rsp->result); |
| |
| BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); |
| |
| /* L2CAP Info req/rsp are unbound to channels, add extra checks */ |
| if (cmd->ident != conn->info_ident || |
| conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) |
| return 0; |
| |
| cancel_delayed_work(&conn->info_timer); |
| |
| if (result != L2CAP_IR_SUCCESS) { |
| conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
| conn->info_ident = 0; |
| |
| l2cap_conn_start(conn); |
| |
| return 0; |
| } |
| |
| switch (type) { |
| case L2CAP_IT_FEAT_MASK: |
| conn->feat_mask = get_unaligned_le32(rsp->data); |
| |
| if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
| struct l2cap_info_req req; |
| req.type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
| |
| conn->info_ident = l2cap_get_ident(conn); |
| |
| l2cap_send_cmd(conn, conn->info_ident, |
| L2CAP_INFO_REQ, sizeof(req), &req); |
| } else { |
| conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
| conn->info_ident = 0; |
| |
| l2cap_conn_start(conn); |
| } |
| break; |
| |
| case L2CAP_IT_FIXED_CHAN: |
| conn->fixed_chan_mask = rsp->data[0]; |
| conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
| conn->info_ident = 0; |
| |
| l2cap_conn_start(conn); |
| break; |
| } |
| |
| return 0; |
| } |
| |
| static int l2cap_create_channel_req(struct l2cap_conn *conn, |
| struct l2cap_cmd_hdr *cmd, |
| u16 cmd_len, void *data) |
| { |
| struct l2cap_create_chan_req *req = data; |
| struct l2cap_create_chan_rsp rsp; |
| struct l2cap_chan *chan; |
| struct hci_dev *hdev; |
| u16 psm, scid; |
| |
| if (cmd_len != sizeof(*req)) |
| return -EPROTO; |
| |
| if (!enable_hs) |
| return -EINVAL; |
| |
| psm = le16_to_cpu(req->psm); |
| scid = le16_to_cpu(req->scid); |
| |
| BT_DBG("psm 0x%2.2x, scid 0x%4.4x, amp_id %d", psm, scid, req->amp_id); |
| |
| /* For controller id 0 make BR/EDR connection */ |
| if (req->amp_id == HCI_BREDR_ID) { |
| l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP, |
| req->amp_id); |
| return 0; |
| } |
| |
| /* Validate AMP controller id */ |
| hdev = hci_dev_get(req->amp_id); |
| if (!hdev) |
| goto error; |
| |
| if (hdev->dev_type != HCI_AMP || !test_bit(HCI_UP, &hdev->flags)) { |
| hci_dev_put(hdev); |
| goto error; |
| } |
| |
| chan = l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP, |
| req->amp_id); |
| if (chan) { |
| struct amp_mgr *mgr = conn->hcon->amp_mgr; |
| struct hci_conn *hs_hcon; |
| |
| hs_hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK, conn->dst); |
| if (!hs_hcon) { |
| hci_dev_put(hdev); |
| return -EFAULT; |
| } |
| |
| BT_DBG("mgr %p bredr_chan %p hs_hcon %p", mgr, chan, hs_hcon); |
| |
| mgr->bredr_chan = chan; |
| chan->hs_hcon = hs_hcon; |
| conn->mtu = hdev->block_mtu; |
| } |
| |
| hci_dev_put(hdev); |
| |
| return 0; |
| |
| error: |
| rsp.dcid = 0; |
| rsp.scid = cpu_to_le16(scid); |
| rsp.result = __constant_cpu_to_le16(L2CAP_CR_BAD_AMP); |
| rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); |
| |
| l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP, |
| sizeof(rsp), &rsp); |
| |
| return -EFAULT; |
| } |
| |
| static void l2cap_send_move_chan_req(struct l2cap_chan *chan, u8 dest_amp_id) |
| { |
| struct l2cap_move_chan_req req; |
| u8 ident; |
| |
| BT_DBG("chan %p, dest_amp_id %d", chan, dest_amp_id); |
| |
| ident = l2cap_get_ident(chan->conn); |
| chan->ident = ident; |
| |
| req.icid = cpu_to_le16(chan->scid); |
| req.dest_amp_id = dest_amp_id; |
| |
| l2cap_send_cmd(chan->conn, ident, L2CAP_MOVE_CHAN_REQ, sizeof(req), |
| &req); |
| |
| __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT); |
| } |
| |
| static void l2cap_send_move_chan_rsp(struct l2cap_chan *chan, u16 result) |
| { |
| struct l2cap_move_chan_rsp rsp; |
| |
| BT_DBG("chan %p, result 0x%4.4x", chan, result); |
| |
| rsp.icid = cpu_to_le16(chan->dcid); |
| rsp.result = cpu_to_le16(result); |
| |
| l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_RSP, |
| sizeof(rsp), &rsp); |
| } |
| |
| static void l2cap_send_move_chan_cfm(struct l2cap_chan *chan, u16 result) |
| { |
| struct l2cap_move_chan_cfm cfm; |
| |
| BT_DBG("chan %p, result 0x%4.4x", chan, result); |
| |
| chan->ident = l2cap_get_ident(chan->conn); |
| |
| cfm.icid = cpu_to_le16(chan->scid); |
| cfm.result = cpu_to_le16(result); |
| |
| l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_CFM, |
| sizeof(cfm), &cfm); |
| |
| __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT); |
| } |
| |
| static void l2cap_send_move_chan_cfm_icid(struct l2cap_conn *conn, u16 icid) |
| { |
| struct l2cap_move_chan_cfm cfm; |
| |
| BT_DBG("conn %p, icid 0x%4.4x", conn, icid); |
| |
| cfm.icid = cpu_to_le16(icid); |
| cfm.result = __constant_cpu_to_le16(L2CAP_MC_UNCONFIRMED); |
| |
| l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_MOVE_CHAN_CFM, |
| sizeof(cfm), &cfm); |
| } |
| |
| static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident, |
| u16 icid) |
| { |
| struct l2cap_move_chan_cfm_rsp rsp; |
| |
| BT_DBG("icid 0x%4.4x", icid); |
| |
| rsp.icid = cpu_to_le16(icid); |
| l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp); |
| } |
| |
| static void __release_logical_link(struct l2cap_chan *chan) |
| { |
| chan->hs_hchan = NULL; |
| chan->hs_hcon = NULL; |
| |
| /* Placeholder - release the logical link */ |
| } |
| |
| static void l2cap_logical_fail(struct l2cap_chan *chan) |
| { |
| /* Logical link setup failed */ |
| if (chan->state != BT_CONNECTED) { |
| /* Create channel failure, disconnect */ |
| l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
| return; |
| } |
| |
| switch (chan->move_role) { |
| case L2CAP_MOVE_ROLE_RESPONDER: |
| l2cap_move_done(chan); |
| l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_SUPP); |
| break; |
| case L2CAP_MOVE_ROLE_INITIATOR: |
| if (chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_COMP || |
| chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_CFM) { |
| /* Remote has only sent pending or |
| * success responses, clean up |
| */ |
| l2cap_move_done(chan); |
| } |
| |
| /* Other amp move states imply that the move |
| * has already aborted |
| */ |
| l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); |
| break; |
| } |
| } |
| |
| static void l2cap_logical_finish_create(struct l2cap_chan *chan, |
| struct hci_chan *hchan) |
| { |
| struct l2cap_conf_rsp rsp; |
| |
| chan->hs_hchan = hchan; |
| chan->hs_hcon->l2cap_data = chan->conn; |
| |
| l2cap_send_efs_conf_rsp(chan, &rsp, chan->ident, 0); |
| |
| if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { |
| int err; |
| |
| set_default_fcs(chan); |
| |
| err = l2cap_ertm_init(chan); |
| if (err < 0) |
| l2cap_send_disconn_req(chan->conn, chan, -err); |
| else |
| l2cap_chan_ready(chan); |
| } |
| } |
| |
| static void l2cap_logical_finish_move(struct l2cap_chan *chan, |
| struct hci_chan *hchan) |
| { |
| chan->hs_hcon = hchan->conn; |
| chan->hs_hcon->l2cap_data = chan->conn; |
| |
| BT_DBG("move_state %d", chan->move_state); |
| |
| switch (chan->move_state) { |
| case L2CAP_MOVE_WAIT_LOGICAL_COMP: |
| /* Move confirm will be sent after a success |
| * response is received |
| */ |
| chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS; |
| break; |
| case L2CAP_MOVE_WAIT_LOGICAL_CFM: |
| if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
| chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY; |
| } else if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) { |
| chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP; |
| l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED); |
| } else if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) { |
| chan->move_state = L2CAP_MOVE_WAIT_CONFIRM; |
| l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS); |
| } |
| break; |
| default: |
| /* Move was not in expected state, free the channel */ |
| __release_logical_link(chan); |
| |
| chan->move_state = L2CAP_MOVE_STABLE; |
| } |
| } |
| |
| /* Call with chan locked */ |
| void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan, |
| u8 status) |
| { |
| BT_DBG("chan %p, hchan %p, status %d", chan, hchan, status); |
| |
| if (status) { |
| l2cap_logical_fail(chan); |
| __release_logical_link(chan); |
| return; |
| } |
| |
| if (chan->state != BT_CONNECTED) { |
| /* Ignore logical link if channel is on BR/EDR */ |
| if (chan->local_amp_id) |
| l2cap_logical_finish_create(chan, hchan); |
| } else { |
| l2cap_logical_finish_move(chan, hchan); |
| } |
| } |
| |
| void l2cap_move_start(struct l2cap_chan *chan) |
| { |
| BT_DBG("chan %p", chan); |
| |
| if (chan->local_amp_id == HCI_BREDR_ID) { |
| if (chan->chan_policy != BT_CHANNEL_POLICY_AMP_PREFERRED) |
| return; |
| chan->move_role = L2CAP_MOVE_ROLE_INITIATOR; |
| chan->move_state = L2CAP_MOVE_WAIT_PREPARE; |
| /* Placeholder - start physical link setup */ |
| } else { |
| chan->move_role = L2CAP_MOVE_ROLE_INITIATOR; |
| chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS; |
| chan->move_id = 0; |
| l2cap_move_setup(chan); |
| l2cap_send_move_chan_req(chan, 0); |
| } |
| } |
| |
| static void l2cap_do_create(struct l2cap_chan *chan, int result, |
| u8 local_amp_id, u8 remote_amp_id) |
| { |
| chan->fcs = L2CAP_FCS_NONE; |
| |
| if (!test_bit(CONF_CONNECT_PEND, &chan->conf_state)) { |
| struct l2cap_conn_rsp rsp; |
| char buf[128]; |
| rsp.scid = cpu_to_le16(chan->dcid); |
| rsp.dcid = cpu_to_le16(chan->scid); |
| |
| /* Incoming channel on AMP */ |
| if (result == L2CAP_CR_SUCCESS) { |
| /* Send successful response */ |
| rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
| rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); |
| } else { |
| /* Send negative response */ |
| rsp.result = cpu_to_le16(L2CAP_CR_NO_MEM); |
| rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); |
| } |
| |
| l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_RSP, |
| sizeof(rsp), &rsp); |
| |
| if (result == L2CAP_CR_SUCCESS) { |
| __l2cap_state_change(chan, BT_CONFIG); |
| set_bit(CONF_REQ_SENT, &chan->conf_state); |
| l2cap_send_cmd(chan->conn, l2cap_get_ident(chan->conn), |
| L2CAP_CONF_REQ, |
| l2cap_build_conf_req(chan, buf), buf); |
| chan->num_conf_req++; |
| } |
| } else { |
| /* Outgoing channel on AMP */ |
| if (result == L2CAP_CR_SUCCESS) { |
| chan->local_amp_id = local_amp_id; |
| l2cap_send_create_chan_req(chan, remote_amp_id); |
| } else { |
| /* Revert to BR/EDR connect */ |
| l2cap_send_conn_req(chan); |
| } |
| } |
| } |
| |
| static void l2cap_do_move_initiate(struct l2cap_chan *chan, u8 local_amp_id, |
| u8 remote_amp_id) |
| { |
| l2cap_move_setup(chan); |
| chan->move_id = local_amp_id; |
| chan->move_state = L2CAP_MOVE_WAIT_RSP; |
| |
| l2cap_send_move_chan_req(chan, remote_amp_id); |
| } |
| |
| static void l2cap_do_move_respond(struct l2cap_chan *chan, int result) |
| { |
| struct hci_chan *hchan = NULL; |
| |
| /* Placeholder - get hci_chan for logical link */ |
| |
| if (hchan) { |
| if (hchan->state == BT_CONNECTED) { |
| /* Logical link is ready to go */ |
| chan->hs_hcon = hchan->conn; |
| chan->hs_hcon->l2cap_data = chan->conn; |
| chan->move_state = L2CAP_MOVE_WAIT_CONFIRM; |
| l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS); |
| |
| l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS); |
| } else { |
| /* Wait for logical link to be ready */ |
| chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM; |
| } |
| } else { |
| /* Logical link not available */ |
| l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_ALLOWED); |
| } |
| } |
| |
| static void l2cap_do_move_cancel(struct l2cap_chan *chan, int result) |
| { |
| if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) { |
| u8 rsp_result; |
| if (result == -EINVAL) |
| rsp_result = L2CAP_MR_BAD_ID; |
| else |
| rsp_result = L2CAP_MR_NOT_ALLOWED; |
| |
| l2cap_send_move_chan_rsp(chan, rsp_result); |
| } |
| |
| chan->move_role = L2CAP_MOVE_ROLE_NONE; |
| chan->move_state = L2CAP_MOVE_STABLE; |
| |
| /* Restart data transmission */ |
| l2cap_ertm_send(chan); |
| } |
| |
| /* Invoke with locked chan */ |
| void __l2cap_physical_cfm(struct l2cap_chan *chan, int result) |
| { |
| u8 local_amp_id = chan->local_amp_id; |
| u8 remote_amp_id = chan->remote_amp_id; |
| |
| BT_DBG("chan %p, result %d, local_amp_id %d, remote_amp_id %d", |
| chan, result, local_amp_id, remote_amp_id); |
| |
| if (chan->state == BT_DISCONN || chan->state == BT_CLOSED) { |
| l2cap_chan_unlock(chan); |
| return; |
| } |
| |
| if (chan->state != BT_CONNECTED) { |
| l2cap_do_create(chan, result, local_amp_id, remote_amp_id); |
| } else if (result != L2CAP_MR_SUCCESS) { |
| l2cap_do_move_cancel(chan, result); |
| } else { |
| switch (chan->move_role) { |
| case L2CAP_MOVE_ROLE_INITIATOR: |
| l2cap_do_move_initiate(chan, local_amp_id, |
| remote_amp_id); |
| break; |
| case L2CAP_MOVE_ROLE_RESPONDER: |
| l2cap_do_move_respond(chan, result); |
| break; |
| default: |
| l2cap_do_move_cancel(chan, result); |
| break; |
| } |
| } |
| } |
| |
| static inline int l2cap_move_channel_req(struct l2cap_conn *conn, |
| struct l2cap_cmd_hdr *cmd, |
| u16 cmd_len, void *data) |
| { |
| struct l2cap_move_chan_req *req = data; |
| struct l2cap_move_chan_rsp rsp; |
| struct l2cap_chan *chan; |
| u16 icid = 0; |
| u16 result = L2CAP_MR_NOT_ALLOWED; |
| |
| if (cmd_len != sizeof(*req)) |
| return -EPROTO; |
| |
| icid = le16_to_cpu(req->icid); |
| |
| BT_DBG("icid 0x%4.4x, dest_amp_id %d", icid, req->dest_amp_id); |
| |
| if (!enable_hs) |
| return -EINVAL; |
| |
| chan = l2cap_get_chan_by_dcid(conn, icid); |
| if (!chan) { |
| rsp.icid = cpu_to_le16(icid); |
| rsp.result = __constant_cpu_to_le16(L2CAP_MR_NOT_ALLOWED); |
| l2cap_send_cmd(conn, cmd->ident, L2CAP_MOVE_CHAN_RSP, |
| sizeof(rsp), &rsp); |
| return 0; |
| } |
| |
| chan->ident = cmd->ident; |
| |
| if (chan->scid < L2CAP_CID_DYN_START || |
| chan->chan_policy == BT_CHANNEL_POLICY_BREDR_ONLY || |
| (chan->mode != L2CAP_MODE_ERTM && |
| chan->mode != L2CAP_MODE_STREAMING)) { |
| result = L2CAP_MR_NOT_ALLOWED; |
| goto send_move_response; |
| } |
| |
| if (chan->local_amp_id == req->dest_amp_id) { |
| result = L2CAP_MR_SAME_ID; |
| goto send_move_response; |
| } |
| |
| if (req->dest_amp_id) { |
| struct hci_dev *hdev; |
| hdev = hci_dev_get(req->dest_amp_id); |
| if (!hdev || hdev->dev_type != HCI_AMP || |
| !test_bit(HCI_UP, &hdev->flags)) { |
| if (hdev) |
| hci_dev_put(hdev); |
| |
| result = L2CAP_MR_BAD_ID; |
| goto send_move_response; |
| } |
| hci_dev_put(hdev); |
| } |
| |
| /* Detect a move collision. Only send a collision response |
| * if this side has "lost", otherwise proceed with the move. |
| * The winner has the larger bd_addr. |
| */ |
| if ((__chan_is_moving(chan) || |
| chan->move_role != L2CAP_MOVE_ROLE_NONE) && |
| bacmp(conn->src, conn->dst) > 0) { |
| result = L2CAP_MR_COLLISION; |
| goto send_move_response; |
| } |
| |
| chan->move_role = L2CAP_MOVE_ROLE_RESPONDER; |
| l2cap_move_setup(chan); |
| chan->move_id = req->dest_amp_id; |
| icid = chan->dcid; |
| |
| if (!req->dest_amp_id) { |
| /* Moving to BR/EDR */ |
| if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
| chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY; |
| result = L2CAP_MR_PEND; |
| } else { |
| chan->move_state = L2CAP_MOVE_WAIT_CONFIRM; |
| result = L2CAP_MR_SUCCESS; |
| } |
| } else { |
| chan->move_state = L2CAP_MOVE_WAIT_PREPARE; |
| /* Placeholder - uncomment when amp functions are available */ |
| /*amp_accept_physical(chan, req->dest_amp_id);*/ |
| result = L2CAP_MR_PEND; |
| } |
| |
| send_move_response: |
| l2cap_send_move_chan_rsp(chan, result); |
| |
| l2cap_chan_unlock(chan); |
| |
| return 0; |
| } |
| |
| static void l2cap_move_continue(struct l2cap_conn *conn, u16 icid, u16 result) |
| { |
| struct l2cap_chan *chan; |
| struct hci_chan *hchan = NULL; |
| |
| chan = l2cap_get_chan_by_scid(conn, icid); |
| if (!chan) { |
| l2cap_send_move_chan_cfm_icid(conn, icid); |
| return; |
| } |
| |
| __clear_chan_timer(chan); |
| if (result == L2CAP_MR_PEND) |
| __set_chan_timer(chan, L2CAP_MOVE_ERTX_TIMEOUT); |
| |
| switch (chan->move_state) { |
| case L2CAP_MOVE_WAIT_LOGICAL_COMP: |
| /* Move confirm will be sent when logical link |
| * is complete. |
| */ |
| chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM; |
| break; |
| case L2CAP_MOVE_WAIT_RSP_SUCCESS: |
| if (result == L2CAP_MR_PEND) { |
| break; |
| } else if (test_bit(CONN_LOCAL_BUSY, |
| &chan->conn_state)) { |
| chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY; |
| } else { |
| /* Logical link is up or moving to BR/EDR, |
| * proceed with move |
| */ |
| chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP; |
| l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED); |
| } |
| break; |
| case L2CAP_MOVE_WAIT_RSP: |
| /* Moving to AMP */ |
| if (result == L2CAP_MR_SUCCESS) { |
| /* Remote is ready, send confirm immediately |
| * after logical link is ready |
| */ |
| chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM; |
| } else { |
| /* Both logical link and move success |
| * are required to confirm |
| */ |
| chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_COMP; |
| } |
| |
| /* Placeholder - get hci_chan for logical link */ |
| if (!hchan) { |
| /* Logical link not available */ |
| l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); |
| break; |
| } |
| |
| /* If the logical link is not yet connected, do not |
| * send confirmation. |
| */ |
| if (hchan->state != BT_CONNECTED) |
| break; |
| |
| /* Logical link is already ready to go */ |
| |
| chan->hs_hcon = hchan->conn; |
| chan->hs_hcon->l2cap_data = chan->conn; |
| |
| if (result == L2CAP_MR_SUCCESS) { |
| /* Can confirm now */ |
| l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED); |
| } else { |
| /* Now only need move success |
| * to confirm |
| */ |
| chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS; |
| } |
| |
| l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS); |
| break; |
| default: |
| /* Any other amp move state means the move failed. */ |
| chan->move_id = chan->local_amp_id; |
| l2cap_move_done(chan); |
| l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); |
| } |
| |
| l2cap_chan_unlock(chan); |
| } |
| |
| static void l2cap_move_fail(struct l2cap_conn *conn, u8 ident, u16 icid, |
| u16 result) |
| { |
| struct l2cap_chan *chan; |
| |
| chan = l2cap_get_chan_by_ident(conn, ident); |
| if (!chan) { |
| /* Could not locate channel, icid is best guess */ |
| l2cap_send_move_chan_cfm_icid(conn, icid); |
| return; |
| } |
| |
| __clear_chan_timer(chan); |
| |
| if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) { |
| if (result == L2CAP_MR_COLLISION) { |
| chan->move_role = L2CAP_MOVE_ROLE_RESPONDER; |
| } else { |
| /* Cleanup - cancel move */ |
| chan->move_id = chan->local_amp_id; |
| l2cap_move_done(chan); |
| } |
| } |
| |
| l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); |
| |
| l2cap_chan_unlock(chan); |
| } |
| |
| static int l2cap_move_channel_rsp(struct l2cap_conn *conn, |
| struct l2cap_cmd_hdr *cmd, |
| u16 cmd_len, void *data) |
| { |
| struct l2cap_move_chan_rsp *rsp = data; |
| u16 icid, result; |
| |
| if (cmd_len != sizeof(*rsp)) |
| return -EPROTO; |
| |
| icid = le16_to_cpu(rsp->icid); |
| result = le16_to_cpu(rsp->result); |
| |
| BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); |
| |
| if (result == L2CAP_MR_SUCCESS || result == L2CAP_MR_PEND) |
| l2cap_move_continue(conn, icid, result); |
| else |
| l2cap_move_fail(conn, cmd->ident, icid, result); |
| |
| return 0; |
| } |
| |
| static int l2cap_move_channel_confirm(struct l2cap_conn *conn, |
| struct l2cap_cmd_hdr *cmd, |
| u16 cmd_len, void *data) |
| { |
| struct l2cap_move_chan_cfm *cfm = data; |
| struct l2cap_chan *chan; |
| u16 icid, result; |
| |
| if (cmd_len != sizeof(*cfm)) |
| return -EPROTO; |
| |
| icid = le16_to_cpu(cfm->icid); |
| result = le16_to_cpu(cfm->result); |
| |
| BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); |
| |
| chan = l2cap_get_chan_by_dcid(conn, icid); |
| if (!chan) { |
| /* Spec requires a response even if the icid was not found */ |
| l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); |
| return 0; |
| } |
| |
| if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM) { |
| if (result == L2CAP_MC_CONFIRMED) { |
| chan->local_amp_id = chan->move_id; |
| if (!chan->local_amp_id) |
| __release_logical_link(chan); |
| } else { |
| chan->move_id = chan->local_amp_id; |
| } |
| |
| l2cap_move_done(chan); |
| } |
| |
| l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); |
| |
| l2cap_chan_unlock(chan); |
| |
| return 0; |
| } |
| |
| static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn, |
| struct l2cap_cmd_hdr *cmd, |
| u16 cmd_len, void *data) |
| { |
| struct l2cap_move_chan_cfm_rsp *rsp = data; |
| struct l2cap_chan *chan; |
| u16 icid; |
| |
| if (cmd_len != sizeof(*rsp)) |
| return -EPROTO; |
| |
| icid = le16_to_cpu(rsp->icid); |
| |
| BT_DBG("icid 0x%4.4x", icid); |
| |
| chan = l2cap_get_chan_by_scid(conn, icid); |
| if (!chan) |
| return 0; |
| |
| __clear_chan_timer(chan); |
| |
| if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM_RSP) { |
| chan->local_amp_id = chan->move_id; |
| |
| if (!chan->local_amp_id && chan->hs_hchan) |
| __release_logical_link(chan); |
| |
| l2cap_move_done(chan); |
| } |
| |
| l2cap_chan_unlock(chan); |
| |
| return 0; |
| } |
| |
| static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency, |
| u16 to_multiplier) |
| { |
| u16 max_latency; |
| |
| if (min > max || min < 6 || max > 3200) |
| return -EINVAL; |
| |
| if (to_multiplier < 10 || to_multiplier > 3200) |
| return -EINVAL; |
| |
| if (max >= to_multiplier * 8) |
| return -EINVAL; |
| |
| max_latency = (to_multiplier * 8 / max) - 1; |
| if (latency > 499 || latency > max_latency) |
| return -EINVAL; |
| |
| return 0; |
| } |
| |
| static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, |
| struct l2cap_cmd_hdr *cmd, |
| u8 *data) |
| { |
| struct hci_conn *hcon = conn->hcon; |
| struct l2cap_conn_param_update_req *req; |
| struct l2cap_conn_param_update_rsp rsp; |
| u16 min, max, latency, to_multiplier, cmd_len; |
| int err; |
| |
| if (!(hcon->link_mode & HCI_LM_MASTER)) |
| return -EINVAL; |
| |
| cmd_len = __le16_to_cpu(cmd->len); |
| if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) |
| return -EPROTO; |
| |
| req = (struct l2cap_conn_param_update_req *) data; |
| min = __le16_to_cpu(req->min); |
| max = __le16_to_cpu(req->max); |
| latency = __le16_to_cpu(req->latency); |
| to_multiplier = __le16_to_cpu(req->to_multiplier); |
| |
| BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", |
| min, max, latency, to_multiplier); |
| |
| memset(&rsp, 0, sizeof(rsp)); |
| |
| err = l2cap_check_conn_param(min, max, latency, to_multiplier); |
| if (err) |
| rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); |
| else |
| rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); |
| |
| l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, |
| sizeof(rsp), &rsp); |
| |
| if (!err) |
| hci_le_conn_update(hcon, min, max, latency, to_multiplier); |
| |
| return 0; |
| } |
| |
| static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, |
| struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
| u8 *data) |
| { |
| int err = 0; |
| |
| switch (cmd->code) { |
| case L2CAP_COMMAND_REJ: |
| l2cap_command_rej(conn, cmd, data); |
| break; |
| |
| case L2CAP_CONN_REQ: |
| err = l2cap_connect_req(conn, cmd, data); |
| break; |
| |
| case L2CAP_CONN_RSP: |
| case L2CAP_CREATE_CHAN_RSP: |
| err = l2cap_connect_create_rsp(conn, cmd, data); |
| break; |
| |
| case L2CAP_CONF_REQ: |
| err = l2cap_config_req(conn, cmd, cmd_len, data); |
| break; |
| |
| case L2CAP_CONF_RSP: |
| err = l2cap_config_rsp(conn, cmd, data); |
| break; |
| |
| case L2CAP_DISCONN_REQ: |
| err = l2cap_disconnect_req(conn, cmd, data); |
| break; |
| |
| case L2CAP_DISCONN_RSP: |
| err = l2cap_disconnect_rsp(conn, cmd, data); |
| break; |
| |
| case L2CAP_ECHO_REQ: |
| l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); |
| break; |
| |
| case L2CAP_ECHO_RSP: |
| break; |
| |
| case L2CAP_INFO_REQ: |
| err = l2cap_information_req(conn, cmd, data); |
| break; |
| |
| case L2CAP_INFO_RSP: |
| err = l2cap_information_rsp(conn, cmd, data); |
| break; |
| |
| case L2CAP_CREATE_CHAN_REQ: |
| err = l2cap_create_channel_req(conn, cmd, cmd_len, data); |
| break; |
| |
| case L2CAP_MOVE_CHAN_REQ: |
| err = l2cap_move_channel_req(conn, cmd, cmd_len, data); |
| break; |
| |
| case L2CAP_MOVE_CHAN_RSP: |
| err = l2cap_move_channel_rsp(conn, cmd, cmd_len, data); |
| break; |
| |
| case L2CAP_MOVE_CHAN_CFM: |
| err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data); |
| break; |
| |
| case L2CAP_MOVE_CHAN_CFM_RSP: |
| err = l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data); |
| break; |
| |
| default: |
| BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); |
| err = -EINVAL; |
| break; |
| } |
| |
| return err; |
| } |
| |
| static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, |
| struct l2cap_cmd_hdr *cmd, u8 *data) |
| { |
| switch (cmd->code) { |
| case L2CAP_COMMAND_REJ: |
| return 0; |
| |
| case L2CAP_CONN_PARAM_UPDATE_REQ: |
| return l2cap_conn_param_update_req(conn, cmd, data); |
| |
| case L2CAP_CONN_PARAM_UPDATE_RSP: |
| return 0; |
| |
| default: |
| BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); |
| return -EINVAL; |
| } |
| } |
| |
| static inline void l2cap_sig_channel(struct l2cap_conn *conn, |
| struct sk_buff *skb) |
| { |
| u8 *data = skb->data; |
| int len = skb->len; |
| struct l2cap_cmd_hdr cmd; |
| int err; |
| |
| l2cap_raw_recv(conn, skb); |
| |
| while (len >= L2CAP_CMD_HDR_SIZE) { |
| u16 cmd_len; |
| memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
| data += L2CAP_CMD_HDR_SIZE; |
| len -= L2CAP_CMD_HDR_SIZE; |
| |
| cmd_len = le16_to_cpu(cmd.len); |
| |
| BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, |
| cmd.ident); |
| |
| if (cmd_len > len || !cmd.ident) { |
| BT_DBG("corrupted command"); |
| break; |
| } |
| |
| if (conn->hcon->type == LE_LINK) |
| err = l2cap_le_sig_cmd(conn, &cmd, data); |
| else |
| err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); |
| |
| if (err) { |
| struct l2cap_cmd_rej_unk rej; |
| |
| BT_ERR("Wrong link type (%d)", err); |
| |
| /* FIXME: Map err to a valid reason */ |
| rej.reason = __constant_cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); |
| l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, |
| sizeof(rej), &rej); |
| } |
| |
| data += cmd_len; |
| len -= cmd_len; |
| } |
| |
| kfree_skb(skb); |
| } |
| |
| static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb) |
| { |
| u16 our_fcs, rcv_fcs; |
| int hdr_size; |
| |
| if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
| hdr_size = L2CAP_EXT_HDR_SIZE; |
| else |
| hdr_size = L2CAP_ENH_HDR_SIZE; |
| |
| if (chan->fcs == L2CAP_FCS_CRC16) { |
| skb_trim(skb, skb->len - L2CAP_FCS_SIZE); |
| rcv_fcs = get_unaligned_le16(skb->data + skb->len); |
| our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); |
| |
| if (our_fcs != rcv_fcs) |
| return -EBADMSG; |
| } |
| return 0; |
| } |
| |
| static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) |
| { |
| struct l2cap_ctrl control; |
| |
| BT_DBG("chan %p", chan); |
| |
| memset(&control, 0, sizeof(control)); |
| control.sframe = 1; |
| control.final = 1; |
| control.reqseq = chan->buffer_seq; |
| set_bit(CONN_SEND_FBIT, &chan->conn_state); |
| |
| if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
| control.super = L2CAP_SUPER_RNR; |
| l2cap_send_sframe(chan, &control); |
| } |
| |
| if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) && |
| chan->unacked_frames > 0) |
| __set_retrans_timer(chan); |
| |
| /* Send pending iframes */ |
| l2cap_ertm_send(chan); |
| |
| if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
| test_bit(CONN_SEND_FBIT, &chan->conn_state)) { |
| /* F-bit wasn't sent in an s-frame or i-frame yet, so |
| * send it now. |
| */ |
| control.super = L2CAP_SUPER_RR; |
| l2cap_send_sframe(chan, &control); |
| } |
| } |
| |
| static void append_skb_frag(struct sk_buff *skb, struct sk_buff *new_frag, |
| struct sk_buff **last_frag) |
| { |
| /* skb->len reflects data in skb as well as all fragments |
| * skb->data_len reflects only data in fragments |
| */ |
| if (!skb_has_frag_list(skb)) |
| skb_shinfo(skb)->frag_list = new_frag; |
| |
| new_frag->next = NULL; |
| |
| (*last_frag)->next = new_frag; |
| *last_frag = new_frag; |
| |
| skb->len += new_frag->len; |
| skb->data_len += new_frag->len; |
| skb->truesize += new_frag->truesize; |
| } |
| |
| static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb, |
| struct l2cap_ctrl *control) |
| { |
| int err = -EINVAL; |
| |
| switch (control->sar) { |
| case L2CAP_SAR_UNSEGMENTED: |
| if (chan->sdu) |
| break; |
| |
| err = chan->ops->recv(chan, skb); |
| break; |
| |
| case L2CAP_SAR_START: |
| if (chan->sdu) |
| break; |
| |
| chan->sdu_len = get_unaligned_le16(skb->data); |
| skb_pull(skb, L2CAP_SDULEN_SIZE); |
| |
| if (chan->sdu_len > chan->imtu) { |
| err = -EMSGSIZE; |
| break; |
| } |
| |
| if (skb->len >= chan->sdu_len) |
| break; |
| |
| chan->sdu = skb; |
| chan->sdu_last_frag = skb; |
| |
| skb = NULL; |
| err = 0; |
| break; |
| |
| case L2CAP_SAR_CONTINUE: |
| if (!chan->sdu) |
| break; |
| |
| append_skb_frag(chan->sdu, skb, |
| &chan->sdu_last_frag); |
| skb = NULL; |
| |
| if (chan->sdu->len >= chan->sdu_len) |
| break; |
| |
| err = 0; |
| break; |
| |
| case L2CAP_SAR_END: |
| if (!chan->sdu) |
| break; |
| |
| append_skb_frag(chan->sdu, skb, |
| &chan->sdu_last_frag); |
| skb = NULL; |
| |
| if (chan->sdu->len != chan->sdu_len) |
| break; |
| |
| err = chan->ops->recv(chan, chan->sdu); |
| |
| if (!err) { |
| /* Reassembly complete */ |
| chan->sdu = NULL; |
| chan->sdu_last_frag = NULL; |
| chan->sdu_len = 0; |
| } |
| break; |
| } |
| |
| if (err) { |
| kfree_skb(skb); |
| kfree_skb(chan->sdu); |
| chan->sdu = NULL; |
| chan->sdu_last_frag = NULL; |
| chan->sdu_len = 0; |
| } |
| |
| return err; |
| } |
| |
| static int l2cap_resegment(struct l2cap_chan *chan) |
| { |
| /* Placeholder */ |
| return 0; |
| } |
| |
| void l2cap_chan_busy(struct l2cap_chan *chan, int busy) |
| { |
| u8 event; |
| |
| if (chan->mode != L2CAP_MODE_ERTM) |
| return; |
| |
| event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR; |
| l2cap_tx(chan, NULL, NULL, event); |
| } |
| |
| static int l2cap_rx_queued_iframes(struct l2cap_chan *chan) |
| { |
| int err = 0; |
| /* Pass sequential frames to l2cap_reassemble_sdu() |
| * until a gap is encountered. |
| */ |
| |
| BT_DBG("chan %p", chan); |
| |
| while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
| struct sk_buff *skb; |
| BT_DBG("Searching for skb with txseq %d (queue len %d)", |
| chan->buffer_seq, skb_queue_len(&chan->srej_q)); |
| |
| skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq); |
| |
| if (!skb) |
| break; |
| |
| skb_unlink(skb, &chan->srej_q); |
| chan->buffer_seq = __next_seq(chan, chan->buffer_seq); |
| err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->control); |
| if (err) |
| break; |
| } |
| |
| if (skb_queue_empty(&chan->srej_q)) { |
| chan->rx_state = L2CAP_RX_STATE_RECV; |
| l2cap_send_ack(chan); |
| } |
| |
| return err; |
| } |
| |
| static void l2cap_handle_srej(struct l2cap_chan *chan, |
| struct l2cap_ctrl *control) |
| { |
| struct sk_buff *skb; |
| |
| BT_DBG("chan %p, control %p", chan, control); |
| |
| if (control->reqseq == chan->next_tx_seq) { |
| BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); |
| l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
| return; |
| } |
| |
| skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); |
| |
| if (skb == NULL) { |
| BT_DBG("Seq %d not available for retransmission", |
| control->reqseq); |
| return; |
| } |
| |
| if (chan->max_tx != 0 && bt_cb(skb)->control.retries >= chan->max_tx) { |
| BT_DBG("Retry limit exceeded (%d)", chan->max_tx); |
| l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
| return; |
| } |
| |
| clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
| |
| if (control->poll) { |
| l2cap_pass_to_tx(chan, control); |
| |
| set_bit(CONN_SEND_FBIT, &chan->conn_state); |
| l2cap_retransmit(chan, control); |
| l2cap_ertm_send(chan); |
| |
| if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { |
| set_bit(CONN_SREJ_ACT, &chan->conn_state); |
| chan->srej_save_reqseq = control->reqseq; |
| } |
| } else { |
| l2cap_pass_to_tx_fbit(chan, control); |
| |
| if (control->final) { |
| if (chan->srej_save_reqseq != control->reqseq || |
| !test_and_clear_bit(CONN_SREJ_ACT, |
| &chan->conn_state)) |
| l2cap_retransmit(chan, control); |
| } else { |
| l2cap_retransmit(chan, control); |
| if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { |
| set_bit(CONN_SREJ_ACT, &chan->conn_state); |
| chan->srej_save_reqseq = control->reqseq; |
| } |
| } |
| } |
| } |
| |
| static void l2cap_handle_rej(struct l2cap_chan *chan, |
| struct l2cap_ctrl *control) |
| { |
| struct sk_buff *skb; |
| |
| BT_DBG("chan %p, control %p", chan, control); |
| |
| if (control->reqseq == chan->next_tx_seq) { |
| BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); |
| l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
| return; |
| } |
| |
| skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); |
| |
| if (chan->max_tx && skb && |
| bt_cb(skb)->control.retries >= chan->max_tx) { |
| BT_DBG("Retry limit exceeded (%d)", chan->max_tx); |
| l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
| return; |
| } |
| |
| clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
| |
| l2cap_pass_to_tx(chan, control); |
| |
| if (control->final) { |
| if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) |
| l2cap_retransmit_all(chan, control); |
| } else { |
| l2cap_retransmit_all(chan, control); |
| l2cap_ertm_send(chan); |
| if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) |
| set_bit(CONN_REJ_ACT, &chan->conn_state); |
| } |
| } |
| |
| static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq) |
| { |
| BT_DBG("chan %p, txseq %d", chan, txseq); |
| |
| BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq, |
| chan->expected_tx_seq); |
| |
| if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { |
| if (__seq_offset(chan, txseq, chan->last_acked_seq) >= |
| chan->tx_win) { |
| /* See notes below regarding "double poll" and |
| * invalid packets. |
| */ |
| if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { |
| BT_DBG("Invalid/Ignore - after SREJ"); |
| return L2CAP_TXSEQ_INVALID_IGNORE; |
| } else { |
| BT_DBG("Invalid - in window after SREJ sent"); |
| return L2CAP_TXSEQ_INVALID; |
| } |
| } |
| |
| if (chan->srej_list.head == txseq) { |
| BT_DBG("Expected SREJ"); |
| return L2CAP_TXSEQ_EXPECTED_SREJ; |
| } |
| |
| if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) { |
| BT_DBG("Duplicate SREJ - txseq already stored"); |
| return L2CAP_TXSEQ_DUPLICATE_SREJ; |
| } |
| |
| if (l2cap_seq_list_contains(&chan->srej_list, txseq)) { |
| BT_DBG("Unexpected SREJ - not requested"); |
| return L2CAP_TXSEQ_UNEXPECTED_SREJ; |
| } |
| } |
| |
| if (chan->expected_tx_seq == txseq) { |
| if (__seq_offset(chan, txseq, chan->last_acked_seq) >= |
| chan->tx_win) { |
| BT_DBG("Invalid - txseq outside tx window"); |
| return L2CAP_TXSEQ_INVALID; |
| } else { |
| BT_DBG("Expected"); |
| return L2CAP_TXSEQ_EXPECTED; |
| } |
| } |
| |
| if (__seq_offset(chan, txseq, chan->last_acked_seq) < |
| __seq_offset(chan, chan->expected_tx_seq, chan->last_acked_seq)) { |
| BT_DBG("Duplicate - expected_tx_seq later than txseq"); |
| return L2CAP_TXSEQ_DUPLICATE; |
| } |
| |
| if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) { |
| /* A source of invalid packets is a "double poll" condition, |
| * where delays cause us to send multiple poll packets. If |
| * the remote stack receives and processes both polls, |
| * sequence numbers can wrap around in such a way that a |
| * resent frame has a sequence number that looks like new data |
| * with a sequence gap. This would trigger an erroneous SREJ |
| * request. |
| * |
| * Fortunately, this is impossible with a tx window that's |
| * less than half of the maximum sequence number, which allows |
| * invalid frames to be safely ignored. |
| * |
| * With tx window sizes greater than half of the tx window |
| * maximum, the frame is invalid and cannot be ignored. This |
| * causes a disconnect. |
| */ |
| |
| if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { |
| BT_DBG("Invalid/Ignore - txseq outside tx window"); |
| return L2CAP_TXSEQ_INVALID_IGNORE; |
| } else { |
| BT_DBG("Invalid - txseq outside tx window"); |
| return L2CAP_TXSEQ_INVALID; |
| } |
| } else { |
| BT_DBG("Unexpected - txseq indicates missing frames"); |
| return L2CAP_TXSEQ_UNEXPECTED; |
| } |
| } |
| |
| static int l2cap_rx_state_recv(struct l2cap_chan *chan, |
| struct l2cap_ctrl *control, |
| struct sk_buff *skb, u8 event) |
| { |
| int err = 0; |
| bool skb_in_use = 0; |
| |
| BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, |
| event); |
| |
| switch (event) { |
| case L2CAP_EV_RECV_IFRAME: |
| switch (l2cap_classify_txseq(chan, control->txseq)) { |
| case L2CAP_TXSEQ_EXPECTED: |
| l2cap_pass_to_tx(chan, control); |
| |
| if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
| BT_DBG("Busy, discarding expected seq %d", |
| control->txseq); |
| break; |
| } |
| |
| chan->expected_tx_seq = __next_seq(chan, |
| control->txseq); |
| |
| chan->buffer_seq = chan->expected_tx_seq; |
| skb_in_use = 1; |
| |
| err = l2cap_reassemble_sdu(chan, skb, control); |
| if (err) |
| break; |
| |
| if (control->final) { |
| if (!test_and_clear_bit(CONN_REJ_ACT, |
| &chan->conn_state)) { |
| control->final = 0; |
| l2cap_retransmit_all(chan, control); |
| l2cap_ertm_send(chan); |
| } |
| } |
| |
| if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) |
| l2cap_send_ack(chan); |
| break; |
| case L2CAP_TXSEQ_UNEXPECTED: |
| l2cap_pass_to_tx(chan, control); |
| |
| /* Can't issue SREJ frames in the local busy state. |
| * Drop this frame, it will be seen as missing |
| * when local busy is exited. |
| */ |
| if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
| BT_DBG("Busy, discarding unexpected seq %d", |
| control->txseq); |
| break; |
| } |
| |
| /* There was a gap in the sequence, so an SREJ |
| * must be sent for each missing frame. The |
| * current frame is stored for later use. |
| */ |
| skb_queue_tail(&chan->srej_q, skb); |
| skb_in_use = 1; |
| BT_DBG("Queued %p (queue len %d)", skb, |
| skb_queue_len(&chan->srej_q)); |
| |
| clear_bit(CONN_SREJ_ACT, &chan->conn_state); |
| l2cap_seq_list_clear(&chan->srej_list); |
| l2cap_send_srej(chan, control->txseq); |
| |
| chan->rx_state = L2CAP_RX_STATE_SREJ_SENT; |
| break; |
| case L2CAP_TXSEQ_DUPLICATE: |
| l2cap_pass_to_tx(chan, control); |
| break; |
| case L2CAP_TXSEQ_INVALID_IGNORE: |
| break; |
| case L2CAP_TXSEQ_INVALID: |
| default: |
| l2cap_send_disconn_req(chan->conn, chan, |
| ECONNRESET); |
| break; |
| } |
| break; |
| case L2CAP_EV_RECV_RR: |
| l2cap_pass_to_tx(chan, control); |
| if (control->final) { |
| clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
| |
| if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state) && |
| !__chan_is_moving(chan)) { |
| control->final = 0; |
| l2cap_retransmit_all(chan, control); |
| } |
| |
| l2cap_ertm_send(chan); |
| } else if (control->poll) { |
| l2cap_send_i_or_rr_or_rnr(chan); |
| } else { |
| if (test_and_clear_bit(CONN_REMOTE_BUSY, |
| &chan->conn_state) && |
| chan->unacked_frames) |
| __set_retrans_timer(chan); |
| |
| l2cap_ertm_send(chan); |
| } |
| break; |
| case L2CAP_EV_RECV_RNR: |
| set_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
| l2cap_pass_to_tx(chan, control); |
| if (control && control->poll) { |
| set_bit(CONN_SEND_FBIT, &chan->conn_state); |
| l2cap_send_rr_or_rnr(chan, 0); |
| } |
| __clear_retrans_timer(chan); |
| l2cap_seq_list_clear(&chan->retrans_list); |
| break; |
| case L2CAP_EV_RECV_REJ: |
| l2cap_handle_rej(chan, control); |
| break; |
| case L2CAP_EV_RECV_SREJ: |
| l2cap_handle_srej(chan, control); |
| break; |
| default: |
| break; |
| } |
| |
| if (skb && !skb_in_use) { |
| BT_DBG("Freeing %p", skb); |
| kfree_skb(skb); |
| } |
| |
| return err; |
| } |
| |
| static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan, |
| struct l2cap_ctrl *control, |
| struct sk_buff *skb, u8 event) |
| { |
| int err = 0; |
| u16 txseq = control->txseq; |
| bool skb_in_use = 0; |
| |
| BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, |
| event); |
| |
| switch (event) { |
| case L2CAP_EV_RECV_IFRAME: |
| switch (l2cap_classify_txseq(chan, txseq)) { |
| case L2CAP_TXSEQ_EXPECTED: |
| /* Keep frame for reassembly later */ |
| l2cap_pass_to_tx(chan, control); |
| skb_queue_tail(&chan->srej_q, skb); |
| skb_in_use = 1; |
| BT_DBG("Queued %p (queue len %d)", skb, |
| skb_queue_len(&chan->srej_q)); |
| |
| chan->expected_tx_seq = __next_seq(chan, txseq); |
| break; |
| case L2CAP_TXSEQ_EXPECTED_SREJ: |
| l2cap_seq_list_pop(&chan->srej_list); |
| |
| l2cap_pass_to_tx(chan, control); |
| skb_queue_tail(&chan->srej_q, skb); |
| skb_in_use = 1; |
| BT_DBG("Queued %p (queue len %d)", skb, |
| skb_queue_len(&chan->srej_q)); |
| |
| err = l2cap_rx_queued_iframes(chan); |
| if (err) |
| break; |
| |
| break; |
| case L2CAP_TXSEQ_UNEXPECTED: |
| /* Got a frame that can't be reassembled yet. |
| * Save it for later, and send SREJs to cover |
| * the missing frames. |
| */ |
| skb_queue_tail(&chan->srej_q, skb); |
| skb_in_use = 1; |
| BT_DBG("Queued %p (queue len %d)", skb, |
| skb_queue_len(&chan->srej_q)); |
| |
| l2cap_pass_to_tx(chan, control); |
| l2cap_send_srej(chan, control->txseq); |
| break; |
| case L2CAP_TXSEQ_UNEXPECTED_SREJ: |
| /* This frame was requested with an SREJ, but |
| * some expected retransmitted frames are |
| * missing. Request retransmission of missing |
| * SREJ'd frames. |
| */ |
| skb_queue_tail(&chan->srej_q, skb); |
| skb_in_use = 1; |
| BT_DBG("Queued %p (queue len %d)", skb, |
| skb_queue_len(&chan->srej_q)); |
| |
| l2cap_pass_to_tx(chan, control); |
| l2cap_send_srej_list(chan, control->txseq); |
| break; |
| case L2CAP_TXSEQ_DUPLICATE_SREJ: |
| /* We've already queued this frame. Drop this copy. */ |
| l2cap_pass_to_tx(chan, control); |
| break; |
| case L2CAP_TXSEQ_DUPLICATE: |
| /* Expecting a later sequence number, so this frame |
| * was already received. Ignore it completely. |
| */ |
| break; |
| case L2CAP_TXSEQ_INVALID_IGNORE: |
| break; |
| case L2CAP_TXSEQ_INVALID: |
| default: |
| l2cap_send_disconn_req(chan->conn, chan, |
| ECONNRESET); |
| break; |
| } |
| break; |
| case L2CAP_EV_RECV_RR: |
| l2cap_pass_to_tx(chan, control); |
| if (control->final) { |
| clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
| |
| if (!test_and_clear_bit(CONN_REJ_ACT, |
| &chan->conn_state)) { |
| control->final = 0; |
| l2cap_retransmit_all(chan, control); |
| } |
| |
| l2cap_ertm_send(chan); |
| } else if (control->poll) { |
| if (test_and_clear_bit(CONN_REMOTE_BUSY, |
| &chan->conn_state) && |
| chan->unacked_frames) { |
| __set_retrans_timer(chan); |
| } |
| |
| set_bit(CONN_SEND_FBIT, &chan->conn_state); |
| l2cap_send_srej_tail(chan); |
| } else { |
| if (test_and_clear_bit(CONN_REMOTE_BUSY, |
| &chan->conn_state) && |
| chan->unacked_frames) |
| __set_retrans_timer(chan); |
| |
| l2cap_send_ack(chan); |
| } |
| break; |
| case L2CAP_EV_RECV_RNR: |
| set_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
| l2cap_pass_to_tx(chan, control); |
| if (control->poll) { |
| l2cap_send_srej_tail(chan); |
| } else { |
| struct l2cap_ctrl rr_control; |
| memset(&rr_control, 0, sizeof(rr_control)); |
| rr_control.sframe = 1; |
| rr_control.super = L2CAP_SUPER_RR; |
| rr_control.reqseq = chan->buffer_seq; |
| l2cap_send_sframe(chan, &rr_control); |
| } |
| |
| break; |
| case L2CAP_EV_RECV_REJ: |
| l2cap_handle_rej(chan, control); |
| break; |
| case L2CAP_EV_RECV_SREJ: |
| l2cap_handle_srej(chan, control); |
| break; |
| } |
| |
| if (skb && !skb_in_use) { |
| BT_DBG("Freeing %p", skb); |
| kfree_skb(skb); |
| } |
| |
| return err; |
| } |
| |
| static int l2cap_finish_move(struct l2cap_chan *chan) |
| { |
| BT_DBG("chan %p", chan); |
| |
| chan->rx_state = L2CAP_RX_STATE_RECV; |
| |
| if (chan->hs_hcon) |
| chan->conn->mtu = chan->hs_hcon->hdev->block_mtu; |
| else |
| chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu; |
| |
| return l2cap_resegment(chan); |
| } |
| |
| static int l2cap_rx_state_wait_p(struct l2cap_chan *chan, |
| struct l2cap_ctrl *control, |
| struct sk_buff *skb, u8 event) |
| { |
| int err; |
| |
| BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, |
| event); |
| |
| if (!control->poll) |
| return -EPROTO; |
| |
| l2cap_process_reqseq(chan, control->reqseq); |
| |
| if (!skb_queue_empty(&chan->tx_q)) |
| chan->tx_send_head = skb_peek(&chan->tx_q); |
| else |
| chan->tx_send_head = NULL; |
| |
| /* Rewind next_tx_seq to the point expected |
| * by the receiver. |
| */ |
| chan->next_tx_seq = control->reqseq; |
| chan->unacked_frames = 0; |
| |
| err = l2cap_finish_move(chan); |
| if (err) |
| return err; |
| |
| set_bit(CONN_SEND_FBIT, &chan->conn_state); |
| l2cap_send_i_or_rr_or_rnr(chan); |
| |
| if (event == L2CAP_EV_RECV_IFRAME) |
| return -EPROTO; |
| |
| return l2cap_rx_state_recv(chan, control, NULL, event); |
| } |
| |
| static int l2cap_rx_state_wait_f(struct l2cap_chan *chan, |
| struct l2cap_ctrl *control, |
| struct sk_buff *skb, u8 event) |
| { |
| int err; |
| |
| if (!control->final) |
| return -EPROTO; |
| |
| clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
| |
| chan->rx_state = L2CAP_RX_STATE_RECV; |
| l2cap_process_reqseq(chan, control->reqseq); |
| |
| if (!skb_queue_empty(&chan->tx_q)) |
| chan->tx_send_head = skb_peek(&chan->tx_q); |
| else |
| chan->tx_send_head = NULL; |
| |
| /* Rewind next_tx_seq to the point expected |
| * by the receiver. |
| */ |
| chan->next_tx_seq = control->reqseq; |
| chan->unacked_frames = 0; |
| |
| if (chan->hs_hcon) |
| chan->conn->mtu = chan->hs_hcon->hdev->block_mtu; |
| else |
| chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu; |
| |
| err = l2cap_resegment(chan); |
| |
| if (!err) |
| err = l2cap_rx_state_recv(chan, control, skb, event); |
| |
| return err; |
| } |
| |
| static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq) |
| { |
| /* Make sure reqseq is for a packet that has been sent but not acked */ |
| u16 unacked; |
| |
| unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq); |
| return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked; |
| } |
| |
| static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
| struct sk_buff *skb, u8 event) |
| { |
| int err = 0; |
| |
| BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan, |
| control, skb, event, chan->rx_state); |
| |
| if (__valid_reqseq(chan, control->reqseq)) { |
| switch (chan->rx_state) { |
| case L2CAP_RX_STATE_RECV: |
| err = l2cap_rx_state_recv(chan, control, skb, event); |
| break; |
| case L2CAP_RX_STATE_SREJ_SENT: |
| err = l2cap_rx_state_srej_sent(chan, control, skb, |
| event); |
| break; |
| case L2CAP_RX_STATE_WAIT_P: |
| err = l2cap_rx_state_wait_p(chan, control, skb, event); |
| break; |
| case L2CAP_RX_STATE_WAIT_F: |
| err = l2cap_rx_state_wait_f(chan, control, skb, event); |
| break; |
| default: |
| /* shut it down */ |
| break; |
| } |
| } else { |
| BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d", |
| control->reqseq, chan->next_tx_seq, |
| chan->expected_ack_seq); |
| l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
| } |
| |
| return err; |
| } |
| |
| static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
| struct sk_buff *skb) |
| { |
| int err = 0; |
| |
| BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb, |
| chan->rx_state); |
| |
| if (l2cap_classify_txseq(chan, control->txseq) == |
| L2CAP_TXSEQ_EXPECTED) { |
| l2cap_pass_to_tx(chan, control); |
| |
| BT_DBG("buffer_seq %d->%d", chan->buffer_seq, |
| __next_seq(chan, chan->buffer_seq)); |
| |
| chan->buffer_seq = __next_seq(chan, chan->buffer_seq); |
| |
| l2cap_reassemble_sdu(chan, skb, control); |
| } else { |
| if (chan->sdu) { |
| kfree_skb(chan->sdu); |
| chan->sdu = NULL; |
| } |
| chan->sdu_last_frag = NULL; |
| chan->sdu_len = 0; |
| |
| if (skb) { |
| BT_DBG("Freeing %p", skb); |
| kfree_skb(skb); |
| } |
| } |
| |
| chan->last_acked_seq = control->txseq; |
| chan->expected_tx_seq = __next_seq(chan, control->txseq); |
| |
| return err; |
| } |
| |
| static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) |
| { |
| struct l2cap_ctrl *control = &bt_cb(skb)->control; |
| u16 len; |
| u8 event; |
| |
| __unpack_control(chan, skb); |
| |
| len = skb->len; |
| |
| /* |
| * We can just drop the corrupted I-frame here. |
| * Receiver will miss it and start proper recovery |
| * procedures and ask for retransmission. |
| */ |
| if (l2cap_check_fcs(chan, skb)) |
| goto drop; |
| |
| if (!control->sframe && control->sar == L2CAP_SAR_START) |
| len -= L2CAP_SDULEN_SIZE; |
| |
| if (chan->fcs == L2CAP_FCS_CRC16) |
| len -= L2CAP_FCS_SIZE; |
| |
| if (len > chan->mps) { |
| l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
| goto drop; |
| } |
| |
| if (!control->sframe) { |
| int err; |
| |
| BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d", |
| control->sar, control->reqseq, control->final, |
| control->txseq); |
| |
| /* Validate F-bit - F=0 always valid, F=1 only |
| * valid in TX WAIT_F |
| */ |
| if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F) |
| goto drop; |
| |
| if (chan->mode != L2CAP_MODE_STREAMING) { |
| event = L2CAP_EV_RECV_IFRAME; |
| err = l2cap_rx(chan, control, skb, event); |
| } else { |
| err = l2cap_stream_rx(chan, control, skb); |
| } |
| |
| if (err) |
| l2cap_send_disconn_req(chan->conn, chan, |
| ECONNRESET); |
| } else { |
| const u8 rx_func_to_event[4] = { |
| L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ, |
| L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ |
| }; |
| |
| /* Only I-frames are expected in streaming mode */ |
| if (chan->mode == L2CAP_MODE_STREAMING) |
| goto drop; |
| |
| BT_DBG("sframe reqseq %d, final %d, poll %d, super %d", |
| control->reqseq, control->final, control->poll, |
| control->super); |
| |
| if (len != 0) { |
| BT_ERR("%d", len); |
| l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
| goto drop; |
| } |
| |
| /* Validate F and P bits */ |
| if (control->final && (control->poll || |
| chan->tx_state != L2CAP_TX_STATE_WAIT_F)) |
| goto drop; |
| |
| event = rx_func_to_event[control->super]; |
| if (l2cap_rx(chan, control, skb, event)) |
| l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
| } |
| |
| return 0; |
| |
| drop: |
| kfree_skb(skb); |
| return 0; |
| } |
| |
| static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid, |
| struct sk_buff *skb) |
| { |
| struct l2cap_chan *chan; |
| |
| chan = l2cap_get_chan_by_scid(conn, cid); |
| if (!chan) { |
| if (cid == L2CAP_CID_A2MP) { |
| chan = a2mp_channel_create(conn, skb); |
| if (!chan) { |
| kfree_skb(skb); |
| return; |
| } |
| |
| l2cap_chan_lock(chan); |
| } else { |
| BT_DBG("unknown cid 0x%4.4x", cid); |
| /* Drop packet and return */ |
| kfree_skb(skb); |
| return; |
| } |
| } |
| |
| BT_DBG("chan %p, len %d", chan, skb->len); |
| |
| if (chan->state != BT_CONNECTED) |
| goto drop; |
| |
| switch (chan->mode) { |
| case L2CAP_MODE_BASIC: |
| /* If socket recv buffers overflows we drop data here |
| * which is *bad* because L2CAP has to be reliable. |
| * But we don't have any other choice. L2CAP doesn't |
| * provide flow control mechanism. */ |
| |
| if (chan->imtu < skb->len) |
| goto drop; |
| |
| if (!chan->ops->recv(chan, skb)) |
| goto done; |
| break; |
| |
| case L2CAP_MODE_ERTM: |
| case L2CAP_MODE_STREAMING: |
| l2cap_data_rcv(chan, skb); |
| goto done; |
| |
| default: |
| BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode); |
| break; |
| } |
| |
| drop: |
| kfree_skb(skb); |
| |
| done: |
| l2cap_chan_unlock(chan); |
| } |
| |
| static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, |
| struct sk_buff *skb) |
| { |
| struct l2cap_chan *chan; |
| |
| chan = l2cap_global_chan_by_psm(0, psm, conn->src, conn->dst); |
| if (!chan) |
| goto drop; |
| |
| BT_DBG("chan %p, len %d", chan, skb->len); |
| |
| if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
| goto drop; |
| |
| if (chan->imtu < skb->len) |
| goto drop; |
| |
| if (!chan->ops->recv(chan, skb)) |
| return; |
| |
| drop: |
| kfree_skb(skb); |
| } |
| |
| static void l2cap_att_channel(struct l2cap_conn *conn, u16 cid, |
| struct sk_buff *skb) |
| { |
| struct l2cap_chan *chan; |
| |
| chan = l2cap_global_chan_by_scid(0, cid, conn->src, conn->dst); |
| if (!chan) |
| goto drop; |
| |
| BT_DBG("chan %p, len %d", chan, skb->len); |
| |
| if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
| goto drop; |
| |
| if (chan->imtu < skb->len) |
| goto drop; |
| |
| if (!chan->ops->recv(chan, skb)) |
| return; |
| |
| drop: |
| kfree_skb(skb); |
| } |
| |
| static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) |
| { |
| struct l2cap_hdr *lh = (void *) skb->data; |
| u16 cid, len; |
| __le16 psm; |
| |
| skb_pull(skb, L2CAP_HDR_SIZE); |
| cid = __le16_to_cpu(lh->cid); |
| len = __le16_to_cpu(lh->len); |
| |
| if (len != skb->len) { |
| kfree_skb(skb); |
| return; |
| } |
| |
| BT_DBG("len %d, cid 0x%4.4x", len, cid); |
| |
| switch (cid) { |
| case L2CAP_CID_LE_SIGNALING: |
| case L2CAP_CID_SIGNALING: |
| l2cap_sig_channel(conn, skb); |
| break; |
| |
| case L2CAP_CID_CONN_LESS: |
| psm = get_unaligned((__le16 *) skb->data); |
| skb_pull(skb, L2CAP_PSMLEN_SIZE); |
| l2cap_conless_channel(conn, psm, skb); |
| break; |
| |
| case L2CAP_CID_LE_DATA: |
| l2cap_att_channel(conn, cid, skb); |
| break; |
| |
| case L2CAP_CID_SMP: |
| if (smp_sig_channel(conn, skb)) |
| l2cap_conn_del(conn->hcon, EACCES); |
| break; |
| |
| default: |
| l2cap_data_channel(conn, cid, skb); |
| break; |
| } |
| } |
| |
| /* ---- L2CAP interface with lower layer (HCI) ---- */ |
| |
| int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr) |
| { |
| int exact = 0, lm1 = 0, lm2 = 0; |
| struct l2cap_chan *c; |
| |
| BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr); |
| |
| /* Find listening sockets and check their link_mode */ |
| read_lock(&chan_list_lock); |
| list_for_each_entry(c, &chan_list, global_l) { |
| struct sock *sk = c->sk; |
| |
| if (c->state != BT_LISTEN) |
| continue; |
| |
| if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { |
| lm1 |= HCI_LM_ACCEPT; |
| if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
| lm1 |= HCI_LM_MASTER; |
| exact++; |
| } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { |
| lm2 |= HCI_LM_ACCEPT; |
| if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
| lm2 |= HCI_LM_MASTER; |
| } |
| } |
| read_unlock(&chan_list_lock); |
| |
| return exact ? lm1 : lm2; |
| } |
| |
| void l2cap_connect_cfm(struct hci_conn *hcon, u8 status) |
| { |
| struct l2cap_conn *conn; |
| |
| BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status); |
| |
| if (!status) { |
| conn = l2cap_conn_add(hcon, status); |
| if (conn) |
| l2cap_conn_ready(conn); |
| } else { |
| l2cap_conn_del(hcon, bt_to_errno(status)); |
| } |
| } |
| |
| int l2cap_disconn_ind(struct hci_conn *hcon) |
| { |
| struct l2cap_conn *conn = hcon->l2cap_data; |
| |
| BT_DBG("hcon %p", hcon); |
| |
| if (!conn) |
| return HCI_ERROR_REMOTE_USER_TERM; |
| return conn->disc_reason; |
| } |
| |
| void l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) |
| { |
| BT_DBG("hcon %p reason %d", hcon, reason); |
| |
| l2cap_conn_del(hcon, bt_to_errno(reason)); |
| } |
| |
| static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt) |
| { |
| if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) |
| return; |
| |
| if (encrypt == 0x00) { |
| if (chan->sec_level == BT_SECURITY_MEDIUM) { |
| __set_chan_timer(chan, L2CAP_ENC_TIMEOUT); |
| } else if (chan->sec_level == BT_SECURITY_HIGH) |
| l2cap_chan_close(chan, ECONNREFUSED); |
| } else { |
| if (chan->sec_level == BT_SECURITY_MEDIUM) |
| __clear_chan_timer(chan); |
| } |
| } |
| |
| int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
| { |
| struct l2cap_conn *conn = hcon->l2cap_data; |
| struct l2cap_chan *chan; |
| |
| if (!conn) |
| return 0; |
| |
| BT_DBG("conn %p status 0x%2.2x encrypt %u", conn, status, encrypt); |
| |
| if (hcon->type == LE_LINK) { |
| if (!status && encrypt) |
| smp_distribute_keys(conn, 0); |
| cancel_delayed_work(&conn->security_timer); |
| } |
| |
| mutex_lock(&conn->chan_lock); |
| |
| list_for_each_entry(chan, &conn->chan_l, list) { |
| l2cap_chan_lock(chan); |
| |
| BT_DBG("chan %p scid 0x%4.4x state %s", chan, chan->scid, |
| state_to_string(chan->state)); |
| |
| if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) { |
| l2cap_chan_unlock(chan); |
| continue; |
| } |
| |
| if (chan->scid == L2CAP_CID_LE_DATA) { |
| if (!status && encrypt) { |
| chan->sec_level = hcon->sec_level; |
| l2cap_chan_ready(chan); |
| } |
| |
| l2cap_chan_unlock(chan); |
| continue; |
| } |
| |
| if (!__l2cap_no_conn_pending(chan)) { |
| l2cap_chan_unlock(chan); |
| continue; |
| } |
| |
| if (!status && (chan->state == BT_CONNECTED || |
| chan->state == BT_CONFIG)) { |
| struct sock *sk = chan->sk; |
| |
| clear_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags); |
| sk->sk_state_change(sk); |
| |
| l2cap_check_encryption(chan, encrypt); |
| l2cap_chan_unlock(chan); |
| continue; |
| } |
| |
| if (chan->state == BT_CONNECT) { |
| if (!status) { |
| l2cap_start_connection(chan); |
| } else { |
| __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
| } |
| } else if (chan->state == BT_CONNECT2) { |
| struct sock *sk = chan->sk; |
| struct l2cap_conn_rsp rsp; |
| __u16 res, stat; |
| |
| lock_sock(sk); |
| |
| if (!status) { |
| if (test_bit(BT_SK_DEFER_SETUP, |
| &bt_sk(sk)->flags)) { |
| res = L2CAP_CR_PEND; |
| stat = L2CAP_CS_AUTHOR_PEND; |
| chan->ops->defer(chan); |
| } else { |
| __l2cap_state_change(chan, BT_CONFIG); |
| res = L2CAP_CR_SUCCESS; |
| stat = L2CAP_CS_NO_INFO; |
| } |
| } else { |
| __l2cap_state_change(chan, BT_DISCONN); |
| __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
| res = L2CAP_CR_SEC_BLOCK; |
| stat = L2CAP_CS_NO_INFO; |
| } |
| |
| release_sock(sk); |
| |
| rsp.scid = cpu_to_le16(chan->dcid); |
| rsp.dcid = cpu_to_le16(chan->scid); |
| rsp.result = cpu_to_le16(res); |
| rsp.status = cpu_to_le16(stat); |
| l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
| sizeof(rsp), &rsp); |
| |
| if (!test_bit(CONF_REQ_SENT, &chan->conf_state) && |
| res == L2CAP_CR_SUCCESS) { |
| char buf[128]; |
| set_bit(CONF_REQ_SENT, &chan->conf_state); |
| l2cap_send_cmd(conn, l2cap_get_ident(conn), |
| L2CAP_CONF_REQ, |
| l2cap_build_conf_req(chan, buf), |
| buf); |
| chan->num_conf_req++; |
| } |
| } |
| |
| l2cap_chan_unlock(chan); |
| } |
| |
| mutex_unlock(&conn->chan_lock); |
| |
| return 0; |
| } |
| |
| int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) |
| { |
| struct l2cap_conn *conn = hcon->l2cap_data; |
| struct l2cap_hdr *hdr; |
| int len; |
| |
| /* For AMP controller do not create l2cap conn */ |
| if (!conn && hcon->hdev->dev_type != HCI_BREDR) |
| goto drop; |
| |
| if (!conn) |
| conn = l2cap_conn_add(hcon, 0); |
| |
| if (!conn) |
| goto drop; |
| |
| BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); |
| |
| switch (flags) { |
| case ACL_START: |
| case ACL_START_NO_FLUSH: |
| case ACL_COMPLETE: |
| if (conn->rx_len) { |
| BT_ERR("Unexpected start frame (len %d)", skb->len); |
| kfree_skb(conn->rx_skb); |
| conn->rx_skb = NULL; |
| conn->rx_len = 0; |
| l2cap_conn_unreliable(conn, ECOMM); |
| } |
| |
| /* Start fragment always begin with Basic L2CAP header */ |
| if (skb->len < L2CAP_HDR_SIZE) { |
| BT_ERR("Frame is too short (len %d)", skb->len); |
| l2cap_conn_unreliable(conn, ECOMM); |
| goto drop; |
| } |
| |
| hdr = (struct l2cap_hdr *) skb->data; |
| len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; |
| |
| if (len == skb->len) { |
| /* Complete frame received */ |
| l2cap_recv_frame(conn, skb); |
| return 0; |
| } |
| |
| BT_DBG("Start: total len %d, frag len %d", len, skb->len); |
| |
| if (skb->len > len) { |
| BT_ERR("Frame is too long (len %d, expected len %d)", |
| skb->len, len); |
| l2cap_conn_unreliable(conn, ECOMM); |
| goto drop; |
| } |
| |
| /* Allocate skb for the complete frame (with header) */ |
| conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL); |
| if (!conn->rx_skb) |
| goto drop; |
| |
| skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
| skb->len); |
| conn->rx_len = len - skb->len; |
| break; |
| |
| case ACL_CONT: |
| BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); |
| |
| if (!conn->rx_len) { |
| BT_ERR("Unexpected continuation frame (len %d)", skb->len); |
| l2cap_conn_unreliable(conn, ECOMM); |
| goto drop; |
| } |
| |
| if (skb->len > conn->rx_len) { |
| BT_ERR("Fragment is too long (len %d, expected %d)", |
| skb->len, conn->rx_len); |
| kfree_skb(conn->rx_skb); |
| conn->rx_skb = NULL; |
| conn->rx_len = 0; |
| l2cap_conn_unreliable(conn, ECOMM); |
| goto drop; |
| } |
| |
| skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
| skb->len); |
| conn->rx_len -= skb->len; |
| |
| if (!conn->rx_len) { |
| /* Complete frame received */ |
| l2cap_recv_frame(conn, conn->rx_skb); |
| conn->rx_skb = NULL; |
| } |
| break; |
| } |
| |
| drop: |
| kfree_skb(skb); |
| return 0; |
| } |
| |
| static int l2cap_debugfs_show(struct seq_file *f, void *p) |
| { |
| struct l2cap_chan *c; |
| |
| read_lock(&chan_list_lock); |
| |
| list_for_each_entry(c, &chan_list, global_l) { |
| struct sock *sk = c->sk; |
| |
| seq_printf(f, "%pMR %pMR %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", |
| &bt_sk(sk)->src, &bt_sk(sk)->dst, |
| c->state, __le16_to_cpu(c->psm), |
| c->scid, c->dcid, c->imtu, c->omtu, |
| c->sec_level, c->mode); |
| } |
| |
| read_unlock(&chan_list_lock); |
| |
| return 0; |
| } |
| |
| static int l2cap_debugfs_open(struct inode *inode, struct file *file) |
| { |
| return single_open(file, l2cap_debugfs_show, inode->i_private); |
| } |
| |
| static const struct file_operations l2cap_debugfs_fops = { |
| .open = l2cap_debugfs_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = single_release, |
| }; |
| |
| static struct dentry *l2cap_debugfs; |
| |
| int __init l2cap_init(void) |
| { |
| int err; |
| |
| err = l2cap_init_sockets(); |
| if (err < 0) |
| return err; |
| |
| if (bt_debugfs) { |
| l2cap_debugfs = debugfs_create_file("l2cap", 0444, bt_debugfs, |
| NULL, &l2cap_debugfs_fops); |
| if (!l2cap_debugfs) |
| BT_ERR("Failed to create L2CAP debug file"); |
| } |
| |
| return 0; |
| } |
| |
| void l2cap_exit(void) |
| { |
| debugfs_remove(l2cap_debugfs); |
| l2cap_cleanup_sockets(); |
| } |
| |
| module_param(disable_ertm, bool, 0644); |
| MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); |