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>
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);
+ struct l2cap_chan *chan, int err);
+
+static int l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
+ struct sk_buff_head *skbs, u8 event);
/* ---- L2CAP channels ---- */
}
/* Find channel with given SCID.
- * Returns locked socket */
+ * 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;
return NULL;
}
-static inline 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);
- 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;
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,
l2cap_chan_put(chan);
}
-struct l2cap_chan *l2cap_chan_create(struct sock *sk)
+struct l2cap_chan *l2cap_chan_create(void)
{
struct l2cap_chan *chan;
mutex_init(&chan->lock);
- chan->sk = sk;
-
write_lock(&chan_list_lock);
list_add(&chan->global_l, &chan_list);
write_unlock(&chan_list_lock);
atomic_set(&chan->refcnt, 1);
- BT_DBG("sk %p chan %p", sk, chan);
+ /* This flag is cleared in l2cap_chan_ready() */
+ set_bit(CONF_NOT_COMPLETE, &chan->conf_state);
+
+ BT_DBG("chan %p", chan);
return chan;
}
l2cap_chan_put(chan);
}
-void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
+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->sec_level = BT_SECURITY_LOW;
+
+ set_bit(FLAG_FORCE_ACTIVE, &chan->flags);
+}
+
+static 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,
- chan->psm, chan->dcid);
+ __le16_to_cpu(chan->psm), chan->dcid);
conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
list_add(&chan->list, &conn->chan_l);
}
-void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
+static void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
{
mutex_lock(&conn->chan_lock);
__l2cap_chan_add(conn, chan);
release_sock(sk);
- if (!(test_bit(CONF_OUTPUT_DONE, &chan->conf_state) &&
- test_bit(CONF_INPUT_DONE, &chan->conf_state)))
+ if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state))
return;
- skb_queue_purge(&chan->tx_q);
-
- if (chan->mode == L2CAP_MODE_ERTM) {
- struct srej_list *l, *tmp;
+ 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);
- list_for_each_entry_safe(l, tmp, &chan->srej_l, list) {
- list_del(&l->list);
- kfree(l);
- }
+ 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;
}
static void l2cap_chan_cleanup_listen(struct sock *parent)
case BT_CONFIG:
if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED &&
conn->hcon->type == ACL_LINK) {
- __clear_chan_timer(chan);
__set_chan_timer(chan, sk->sk_sndtimeo);
l2cap_send_disconn_req(conn, chan, reason);
} else
struct l2cap_conn_rsp rsp;
__u16 result;
- if (bt_sk(sk)->defer_setup)
+ if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))
result = L2CAP_CR_SEC_BLOCK;
else
result = L2CAP_CR_BAD_PSM;
hci_send_acl(chan->conn->hchan, skb, flags);
}
-static inline void l2cap_send_sframe(struct l2cap_chan *chan, u32 control)
+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 struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan,
+ u32 control)
{
struct sk_buff *skb;
struct l2cap_hdr *lh;
- struct l2cap_conn *conn = chan->conn;
- int count, hlen;
-
- if (chan->state != BT_CONNECTED)
- return;
+ int hlen;
if (test_bit(FLAG_EXT_CTRL, &chan->flags))
hlen = L2CAP_EXT_HDR_SIZE;
if (chan->fcs == L2CAP_FCS_CRC16)
hlen += L2CAP_FCS_SIZE;
- BT_DBG("chan %p, control 0x%8.8x", chan, control);
-
- count = min_t(unsigned int, conn->mtu, hlen);
-
- control |= __set_sframe(chan);
-
- if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
- control |= __set_ctrl_final(chan);
-
- if (test_and_clear_bit(CONN_SEND_PBIT, &chan->conn_state))
- control |= __set_ctrl_poll(chan);
+ skb = bt_skb_alloc(hlen, GFP_KERNEL);
- skb = bt_skb_alloc(count, GFP_ATOMIC);
if (!skb)
- return;
+ 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);
- __put_control(chan, control, skb_put(skb, __ctrl_size(chan)));
+ 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 *)lh, count - L2CAP_FCS_SIZE);
+ u16 fcs = crc16(0, (u8 *)skb->data, skb->len);
put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
}
skb->priority = HCI_PRIO_MAX;
- l2cap_do_send(chan, skb);
+ return skb;
}
-static inline void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, u32 control)
+static void l2cap_send_sframe(struct l2cap_chan *chan,
+ struct l2cap_ctrl *control)
{
- if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
- control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR);
+ struct sk_buff *skb;
+ u32 control_field;
+
+ BT_DBG("chan %p, control %p", chan, control);
+
+ if (!control->sframe)
+ 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);
- } else
- control |= __set_ctrl_super(chan, L2CAP_SUPER_RR);
- control |= __set_reqseq(chan, chan->buffer_seq);
+ 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);
- l2cap_send_sframe(chan, control);
+ 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)
l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req);
}
+static void l2cap_chan_ready(struct l2cap_chan *chan)
+{
+ struct sock *sk = chan->sk;
+ struct sock *parent;
+
+ lock_sock(sk);
+
+ parent = bt_sk(sk)->parent;
+
+ BT_DBG("sk %p, parent %p", sk, parent);
+
+ /* This clears all conf flags, including CONF_NOT_COMPLETE */
+ chan->conf_state = 0;
+ __clear_chan_timer(chan);
+
+ __l2cap_state_change(chan, BT_CONNECTED);
+ sk->sk_state_change(sk);
+
+ if (parent)
+ parent->sk_data_ready(parent, 0);
+
+ release_sock(sk);
+}
+
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)) {
lock_sock(sk);
- if (bt_sk(sk)->defer_setup) {
+ if (test_bit(BT_SK_DEFER_SETUP,
+ &bt_sk(sk)->flags)) {
struct sock *parent = bt_sk(sk)->parent;
rsp.result = cpu_to_le16(L2CAP_CR_PEND);
rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND);
mutex_unlock(&conn->chan_lock);
}
-/* Find socket with cid and source bdaddr.
+/* Find socket with cid and source/destination bdaddr.
* Returns closest match, locked.
*/
-static struct l2cap_chan *l2cap_global_chan_by_scid(int state, __le16 cid, bdaddr_t *src)
+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;
continue;
if (c->scid == cid) {
+ int src_match, dst_match;
+ int src_any, dst_any;
+
/* Exact match. */
- if (!bacmp(&bt_sk(sk)->src, src)) {
+ 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 */
- if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY))
+ 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;
}
}
/* Check if we have socket listening on cid */
pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA,
- conn->src);
+ conn->src, conn->dst);
if (!pchan)
return;
release_sock(parent);
}
-static void l2cap_chan_ready(struct l2cap_chan *chan)
-{
- struct sock *sk = chan->sk;
- struct sock *parent;
-
- lock_sock(sk);
-
- parent = bt_sk(sk)->parent;
-
- BT_DBG("sk %p, parent %p", sk, parent);
-
- chan->conf_state = 0;
- __clear_chan_timer(chan);
-
- __l2cap_state_change(chan, BT_CONNECTED);
- sk->sk_state_change(sk);
-
- if (parent)
- parent->sk_data_ready(parent, 0);
-
- release_sock(sk);
-}
-
static void l2cap_conn_ready(struct l2cap_conn *conn)
{
struct l2cap_chan *chan;
/* 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->data);
+ l2cap_chan_put(chan);
}
mutex_unlock(&conn->chan_lock);
/* ---- Socket interface ---- */
-/* Find socket with psm and source bdaddr.
+/* 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)
+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;
continue;
if (c->psm == psm) {
+ int src_match, dst_match;
+ int src_any, dst_any;
+
/* Exact match. */
- if (!bacmp(&bt_sk(sk)->src, src)) {
+ 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 */
- if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY))
+ 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;
}
}
return c1;
}
-int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid, bdaddr_t *dst)
+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;
__u8 auth_type;
int err;
- BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst),
- chan->psm);
+ BT_DBG("%s -> %s (type %u) psm 0x%2.2x", batostr(src), batostr(dst),
+ dst_type, __le16_to_cpu(chan->psm));
hdev = hci_get_route(dst, src);
if (!hdev)
auth_type = l2cap_get_auth_type(chan);
if (chan->dcid == L2CAP_CID_LE_DATA)
- hcon = hci_connect(hdev, LE_LINK, dst,
- chan->sec_level, auth_type);
+ hcon = hci_connect(hdev, LE_LINK, dst, dst_type,
+ chan->sec_level, auth_type);
else
- hcon = hci_connect(hdev, ACL_LINK, dst,
- chan->sec_level, auth_type);
+ hcon = hci_connect(hdev, ACL_LINK, dst, dst_type,
+ chan->sec_level, auth_type);
if (IS_ERR(hcon)) {
err = PTR_ERR(hcon);
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);
static void l2cap_monitor_timeout(struct work_struct *work)
{
struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
- monitor_timer.work);
+ monitor_timer.work);
BT_DBG("chan %p", chan);
l2cap_chan_lock(chan);
- if (chan->retry_count >= chan->remote_max_tx) {
- l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED);
+ if (!chan->conn) {
l2cap_chan_unlock(chan);
l2cap_chan_put(chan);
return;
}
- chan->retry_count++;
- __set_monitor_timer(chan);
+ l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO);
- l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL);
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);
+ retrans_timer.work);
BT_DBG("chan %p", chan);
l2cap_chan_lock(chan);
- chan->retry_count = 1;
- __set_monitor_timer(chan);
-
- set_bit(CONN_WAIT_F, &chan->conn_state);
-
- l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL);
+ 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_drop_acked_frames(struct l2cap_chan *chan)
+static int l2cap_streaming_send(struct l2cap_chan *chan,
+ struct sk_buff_head *skbs)
{
struct sk_buff *skb;
+ struct l2cap_ctrl *control;
- while ((skb = skb_peek(&chan->tx_q)) &&
- chan->unacked_frames) {
- if (bt_cb(skb)->tx_seq == chan->expected_ack_seq)
- break;
+ BT_DBG("chan %p, skbs %p", chan, skbs);
- skb = skb_dequeue(&chan->tx_q);
- kfree_skb(skb);
+ skb_queue_splice_tail_init(skbs, &chan->tx_q);
- chan->unacked_frames--;
- }
+ while (!skb_queue_empty(&chan->tx_q)) {
- if (!chan->unacked_frames)
- __clear_retrans_timer(chan);
-}
+ skb = skb_dequeue(&chan->tx_q);
-static void l2cap_streaming_send(struct l2cap_chan *chan)
-{
- struct sk_buff *skb;
- u32 control;
- u16 fcs;
+ bt_cb(skb)->control.retries = 1;
+ control = &bt_cb(skb)->control;
+
+ control->reqseq = 0;
+ control->txseq = chan->next_tx_seq;
- while ((skb = skb_dequeue(&chan->tx_q))) {
- control = __get_control(chan, skb->data + L2CAP_HDR_SIZE);
- control |= __set_txseq(chan, chan->next_tx_seq);
- __put_control(chan, control, skb->data + L2CAP_HDR_SIZE);
+ __pack_control(chan, control, skb);
if (chan->fcs == L2CAP_FCS_CRC16) {
- fcs = crc16(0, (u8 *)skb->data,
- skb->len - L2CAP_FCS_SIZE);
- put_unaligned_le16(fcs,
- skb->data + skb->len - L2CAP_FCS_SIZE);
+ 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 %d", (int)control->txseq);
+
chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
+ chan->frames_sent++;
}
+
+ return 0;
}
-static void l2cap_retransmit_one_frame(struct l2cap_chan *chan, u16 tx_seq)
+static int l2cap_ertm_send(struct l2cap_chan *chan)
{
struct sk_buff *skb, *tx_skb;
- u16 fcs;
- u32 control;
+ struct l2cap_ctrl *control;
+ int sent = 0;
- skb = skb_peek(&chan->tx_q);
- if (!skb)
- return;
+ BT_DBG("chan %p", chan);
- while (bt_cb(skb)->tx_seq != tx_seq) {
- if (skb_queue_is_last(&chan->tx_q, skb))
- return;
+ if (chan->state != BT_CONNECTED)
+ return -ENOTCONN;
- skb = skb_queue_next(&chan->tx_q, skb);
- }
+ if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
+ return 0;
- if (chan->remote_max_tx &&
- bt_cb(skb)->retries == chan->remote_max_tx) {
- l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED);
- return;
- }
+ while (chan->tx_send_head &&
+ chan->unacked_frames < chan->remote_tx_win &&
+ chan->tx_state == L2CAP_TX_STATE_XMIT) {
- tx_skb = skb_clone(skb, GFP_ATOMIC);
- bt_cb(skb)->retries++;
+ skb = chan->tx_send_head;
- control = __get_control(chan, tx_skb->data + L2CAP_HDR_SIZE);
- control &= __get_sar_mask(chan);
+ bt_cb(skb)->control.retries = 1;
+ control = &bt_cb(skb)->control;
- if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
- control |= __set_ctrl_final(chan);
+ if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
+ control->final = 1;
- control |= __set_reqseq(chan, chan->buffer_seq);
- control |= __set_txseq(chan, tx_seq);
+ control->reqseq = chan->buffer_seq;
+ chan->last_acked_seq = chan->buffer_seq;
+ control->txseq = chan->next_tx_seq;
- __put_control(chan, control, tx_skb->data + L2CAP_HDR_SIZE);
+ __pack_control(chan, control, skb);
- if (chan->fcs == L2CAP_FCS_CRC16) {
- fcs = crc16(0, (u8 *)tx_skb->data,
- tx_skb->len - L2CAP_FCS_SIZE);
- put_unaligned_le16(fcs,
- tx_skb->data + tx_skb->len - L2CAP_FCS_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));
+ }
- l2cap_do_send(chan, tx_skb);
-}
+ /* 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);
-static int l2cap_ertm_send(struct l2cap_chan *chan)
-{
- struct sk_buff *skb, *tx_skb;
- u16 fcs;
- u32 control;
- int nsent = 0;
+ if (!tx_skb)
+ break;
- if (chan->state != BT_CONNECTED)
- return -ENOTCONN;
+ __set_retrans_timer(chan);
- while ((skb = chan->tx_send_head) && (!l2cap_tx_window_full(chan))) {
+ chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
+ chan->unacked_frames++;
+ chan->frames_sent++;
+ sent++;
- if (chan->remote_max_tx &&
- bt_cb(skb)->retries == chan->remote_max_tx) {
- l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED);
- break;
- }
+ 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);
- tx_skb = skb_clone(skb, GFP_ATOMIC);
+ l2cap_do_send(chan, tx_skb);
+ BT_DBG("Sent txseq %d", (int)control->txseq);
+ }
- bt_cb(skb)->retries++;
+ BT_DBG("Sent %d, %d unacked, %d in ERTM queue", sent,
+ (int) chan->unacked_frames, skb_queue_len(&chan->tx_q));
- control = __get_control(chan, tx_skb->data + L2CAP_HDR_SIZE);
- control &= __get_sar_mask(chan);
+ return sent;
+}
- if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
- control |= __set_ctrl_final(chan);
+static void l2cap_ertm_resend(struct l2cap_chan *chan)
+{
+ struct l2cap_ctrl control;
+ struct sk_buff *skb;
+ struct sk_buff *tx_skb;
+ u16 seq;
- control |= __set_reqseq(chan, chan->buffer_seq);
- control |= __set_txseq(chan, chan->next_tx_seq);
+ BT_DBG("chan %p", chan);
- __put_control(chan, control, tx_skb->data + L2CAP_HDR_SIZE);
+ if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
+ return;
- if (chan->fcs == L2CAP_FCS_CRC16) {
- fcs = crc16(0, (u8 *)skb->data,
- tx_skb->len - L2CAP_FCS_SIZE);
- put_unaligned_le16(fcs, skb->data +
- tx_skb->len - L2CAP_FCS_SIZE);
+ 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;
}
- l2cap_do_send(chan, tx_skb);
+ bt_cb(skb)->control.retries++;
+ control = bt_cb(skb)->control;
- __set_retrans_timer(chan);
+ 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;
+ }
- bt_cb(skb)->tx_seq = chan->next_tx_seq;
+ control.reqseq = chan->buffer_seq;
+ if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
+ control.final = 1;
+ else
+ control.final = 0;
- chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
+ if (skb_cloned(skb)) {
+ /* Cloned sk_buffs are read-only, so we need a
+ * writeable copy
+ */
+ tx_skb = skb_copy(skb, GFP_ATOMIC);
+ } else {
+ tx_skb = skb_clone(skb, GFP_ATOMIC);
+ }
- if (bt_cb(skb)->retries == 1) {
- chan->unacked_frames++;
+ if (!tx_skb) {
+ l2cap_seq_list_clear(&chan->retrans_list);
+ break;
+ }
- if (!nsent++)
- __clear_ack_timer(chan);
+ /* 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);
}
- chan->frames_sent++;
+ 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));
+ }
- 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);
- return nsent;
+ BT_DBG("Resent txseq %d", control.txseq);
+
+ chan->last_acked_seq = chan->buffer_seq;
+ }
}
-static int l2cap_retransmit_frames(struct l2cap_chan *chan)
+static void l2cap_retransmit(struct l2cap_chan *chan,
+ struct l2cap_ctrl *control)
{
- int ret;
+ BT_DBG("chan %p, control %p", chan, control);
- if (!skb_queue_empty(&chan->tx_q))
- chan->tx_send_head = chan->tx_q.next;
-
- chan->next_tx_seq = chan->expected_ack_seq;
- ret = l2cap_ertm_send(chan);
- return ret;
+ l2cap_seq_list_append(&chan->retrans_list, control->reqseq);
+ l2cap_ertm_resend(chan);
}
-static void __l2cap_send_ack(struct l2cap_chan *chan)
+static void l2cap_retransmit_all(struct l2cap_chan *chan,
+ struct l2cap_ctrl *control)
{
- u32 control = 0;
+ struct sk_buff *skb;
- control |= __set_reqseq(chan, chan->buffer_seq);
+ BT_DBG("chan %p, control %p", chan, control);
- if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
- control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR);
- set_bit(CONN_RNR_SENT, &chan->conn_state);
- l2cap_send_sframe(chan, control);
- return;
- }
+ if (control->poll)
+ set_bit(CONN_SEND_FBIT, &chan->conn_state);
+
+ l2cap_seq_list_clear(&chan->retrans_list);
- if (l2cap_ertm_send(chan) > 0)
+ if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
return;
- control |= __set_ctrl_super(chan, L2CAP_SUPER_RR);
- l2cap_send_sframe(chan, control);
+ 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)
{
- __clear_ack_timer(chan);
- __l2cap_send_ack(chan);
-}
+ struct l2cap_ctrl control;
+ u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
+ chan->last_acked_seq);
+ int threshold;
-static void l2cap_send_srejtail(struct l2cap_chan *chan)
-{
- struct srej_list *tail;
- u32 control;
+ BT_DBG("chan %p last_acked_seq %d buffer_seq %d",
+ chan, chan->last_acked_seq, chan->buffer_seq);
- control = __set_ctrl_super(chan, L2CAP_SUPER_SREJ);
- control |= __set_ctrl_final(chan);
+ memset(&control, 0, sizeof(control));
+ control.sframe = 1;
- tail = list_entry((&chan->srej_l)->prev, struct srej_list, list);
- control |= __set_reqseq(chan, tail->tx_seq);
+ 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;
+ }
- l2cap_send_sframe(chan, control);
+ /* Ack now if the tx window is 3/4ths full.
+ * Calculate without mul or div
+ */
+ threshold = chan->tx_win;
+ threshold += threshold << 1;
+ threshold >>= 2;
+
+ BT_DBG("frames_to_ack %d, threshold %d", (int)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 l2cap_conn *conn = chan->conn;
struct sk_buff **frag;
- int err, sent = 0;
+ int sent = 0;
if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count))
return -EFAULT;
/* 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);
- *frag = chan->ops->alloc_skb(chan, count,
- msg->msg_flags & MSG_DONTWAIT,
- &err);
+ tmp = chan->ops->alloc_skb(chan, count,
+ msg->msg_flags & MSG_DONTWAIT);
+ if (IS_ERR(tmp))
+ return PTR_ERR(tmp);
+
+ *frag = tmp;
- if (!*frag)
- return err;
if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count))
return -EFAULT;
sent += count;
len -= count;
+ skb->len += (*frag)->len;
+ skb->data_len += (*frag)->len;
+
frag = &(*frag)->next;
}
count = min_t(unsigned int, (conn->mtu - hlen), len);
skb = chan->ops->alloc_skb(chan, count + hlen,
- msg->msg_flags & MSG_DONTWAIT, &err);
-
- if (!skb)
- return ERR_PTR(err);
+ 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 + (hlen - L2CAP_HDR_SIZE));
- put_unaligned_le16(chan->psm, skb_put(skb, 2));
+ 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)) {
{
struct l2cap_conn *conn = chan->conn;
struct sk_buff *skb;
- int err, count, hlen = L2CAP_HDR_SIZE;
+ int err, count;
struct l2cap_hdr *lh;
BT_DBG("chan %p len %d", chan, (int)len);
- count = min_t(unsigned int, (conn->mtu - hlen), len);
-
- skb = chan->ops->alloc_skb(chan, count + hlen,
- msg->msg_flags & MSG_DONTWAIT, &err);
+ count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len);
- if (!skb)
- return ERR_PTR(err);
+ 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 + (hlen - L2CAP_HDR_SIZE));
+ lh->len = cpu_to_le16(len);
err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
if (unlikely(err < 0)) {
static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan,
struct msghdr *msg, size_t len,
- u32 control, u16 sdulen)
+ u16 sdulen)
{
struct l2cap_conn *conn = chan->conn;
struct sk_buff *skb;
count = min_t(unsigned int, (conn->mtu - hlen), len);
skb = chan->ops->alloc_skb(chan, count + hlen,
- msg->msg_flags & MSG_DONTWAIT, &err);
-
- if (!skb)
- return ERR_PTR(err);
+ 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));
- __put_control(chan, control, skb_put(skb, __ctrl_size(chan)));
+ /* 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));
return ERR_PTR(err);
}
- if (chan->fcs == L2CAP_FCS_CRC16)
- put_unaligned_le16(0, skb_put(skb, L2CAP_FCS_SIZE));
-
- bt_cb(skb)->retries = 0;
+ bt_cb(skb)->control.fcs = chan->fcs;
+ bt_cb(skb)->control.retries = 0;
return skb;
}
-static int l2cap_sar_segment_sdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len)
+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;
- struct sk_buff_head sar_queue;
- u32 control;
- size_t size = 0;
+ u16 sdu_len;
+ size_t pdu_len;
+ int err = 0;
+ u8 sar;
- skb_queue_head_init(&sar_queue);
- control = __set_ctrl_sar(chan, L2CAP_SAR_START);
- skb = l2cap_create_iframe_pdu(chan, msg, chan->remote_mps, control, len);
- if (IS_ERR(skb))
- return PTR_ERR(skb);
+ BT_DBG("chan %p, msg %p, len %d", chan, msg, (int)len);
- __skb_queue_tail(&sar_queue, skb);
- len -= chan->remote_mps;
- size += chan->remote_mps;
+ /* 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.
+ */
- while (len > 0) {
- size_t buflen;
+ /* PDU size is derived from the HCI MTU */
+ pdu_len = chan->conn->mtu;
- if (len > chan->remote_mps) {
- control = __set_ctrl_sar(chan, L2CAP_SAR_CONTINUE);
- buflen = chan->remote_mps;
- } else {
- control = __set_ctrl_sar(chan, L2CAP_SAR_END);
- buflen = len;
- }
+ pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD);
+
+ /* Adjust for largest possible L2CAP overhead. */
+ pdu_len -= L2CAP_EXT_HDR_SIZE + L2CAP_FCS_SIZE;
+
+ /* 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);
- skb = l2cap_create_iframe_pdu(chan, msg, buflen, control, 0);
if (IS_ERR(skb)) {
- skb_queue_purge(&sar_queue);
+ __skb_queue_purge(seg_queue);
return PTR_ERR(skb);
}
- __skb_queue_tail(&sar_queue, skb);
- len -= buflen;
- size += buflen;
+ 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;
+ }
}
- skb_queue_splice_tail(&sar_queue, &chan->tx_q);
- if (chan->tx_send_head == NULL)
- chan->tx_send_head = sar_queue.next;
- return size;
+ return err;
}
int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len,
u32 priority)
{
struct sk_buff *skb;
- u32 control;
int err;
+ struct sk_buff_head seg_queue;
/* Connectionless channel */
if (chan->chan_type == L2CAP_CHAN_CONN_LESS) {
case L2CAP_MODE_ERTM:
case L2CAP_MODE_STREAMING:
- /* Entire SDU fits into one PDU */
- if (len <= chan->remote_mps) {
- control = __set_ctrl_sar(chan, L2CAP_SAR_UNSEGMENTED);
- skb = l2cap_create_iframe_pdu(chan, msg, len, control,
- 0);
- if (IS_ERR(skb))
- return PTR_ERR(skb);
+ /* Check outgoing MTU */
+ if (len > chan->omtu) {
+ err = -EMSGSIZE;
+ break;
+ }
- __skb_queue_tail(&chan->tx_q, skb);
+ __skb_queue_head_init(&seg_queue);
- if (chan->tx_send_head == NULL)
- chan->tx_send_head = skb;
+ /* 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);
- } else {
- /* Segment SDU into multiples PDUs */
- err = l2cap_sar_segment_sdu(chan, msg, len);
- if (err < 0)
- return err;
+ /* 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 (chan->mode == L2CAP_MODE_STREAMING) {
- l2cap_streaming_send(chan);
- err = len;
+ if (err)
break;
- }
- if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) &&
- test_bit(CONN_WAIT_F, &chan->conn_state)) {
- err = len;
- break;
- }
+ if (chan->mode == L2CAP_MODE_ERTM)
+ err = l2cap_tx(chan, NULL, &seg_queue,
+ L2CAP_EV_DATA_REQUEST);
+ else
+ err = l2cap_streaming_send(chan, &seg_queue);
- err = l2cap_ertm_send(chan);
- if (err >= 0)
+ if (!err)
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:
return err;
}
+static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq)
+{
+ struct l2cap_ctrl control;
+ u16 seq;
+
+ BT_DBG("chan %p, txseq %d", 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 %d", 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 %d", chan, reqseq);
+
+ if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq)
+ return;
+
+ BT_DBG("expected_ack_seq %d, unacked_frames %d",
+ 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 %d", (int) 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 int l2cap_tx_state_xmit(struct l2cap_chan *chan,
+ struct l2cap_ctrl *control,
+ struct sk_buff_head *skbs, u8 event)
+{
+ int err = 0;
+
+ 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;
+ }
+
+ return err;
+}
+
+static int l2cap_tx_state_wait_f(struct l2cap_chan *chan,
+ struct l2cap_ctrl *control,
+ struct sk_buff_head *skbs, u8 event)
+{
+ int err = 0;
+
+ 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;
+ }
+
+ return err;
+}
+
+static int l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
+ struct sk_buff_head *skbs, u8 event)
+{
+ int err = 0;
+
+ 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:
+ err = l2cap_tx_state_xmit(chan, control, skbs, event);
+ break;
+ case L2CAP_TX_STATE_WAIT_F:
+ err = l2cap_tx_state_wait_f(chan, control, skbs, event);
+ break;
+ default:
+ /* Ignore event */
+ break;
+ }
+
+ return err;
+}
+
+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)
{
static void l2cap_ack_timeout(struct work_struct *work)
{
struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
- ack_timer.work);
+ ack_timer.work);
+ u16 frames_to_ack;
BT_DBG("chan %p", chan);
l2cap_chan_lock(chan);
- __l2cap_send_ack(chan);
+ frames_to_ack = __seq_offset(chan, chan->buffer_seq,
+ chan->last_acked_seq);
- l2cap_chan_unlock(chan);
+ if (frames_to_ack)
+ l2cap_send_rr_or_rnr(chan, 0);
+ l2cap_chan_unlock(chan);
l2cap_chan_put(chan);
}
-static inline void l2cap_ertm_init(struct l2cap_chan *chan)
+static inline 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->num_acked = 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);
+
+ 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);
skb_queue_head_init(&chan->srej_q);
- INIT_LIST_HEAD(&chan->srej_l);
+ 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)
break;
case L2CAP_MODE_STREAMING:
+ l2cap_txwin_setup(chan);
rfc.mode = L2CAP_MODE_STREAMING;
rfc.txwin_size = 0;
rfc.max_transmit = 0;
chan->remote_mps = size;
rfc.retrans_timeout =
- le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO);
+ __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO);
rfc.monitor_timeout =
- le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO);
+ __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO);
set_bit(CONF_MODE_DONE, &chan->conf_state);
u16 dcid = 0, scid = __le16_to_cpu(req->scid);
__le16 psm = req->psm;
- BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid);
+ 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);
+ pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src, conn->dst);
if (!pchan) {
result = L2CAP_CR_BAD_PSM;
goto sendresp;
if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
if (l2cap_chan_check_security(chan)) {
- if (bt_sk(sk)->defer_setup) {
+ 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;
u16 dcid, flags;
u8 rsp[64];
struct l2cap_chan *chan;
- int len;
+ int len, err = 0;
dcid = __le16_to_cpu(req->dcid);
flags = __le16_to_cpu(req->flags);
if (!chan)
return -ENOENT;
- l2cap_chan_lock(chan);
-
if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) {
struct l2cap_cmd_rej_cid rej;
l2cap_state_change(chan, BT_CONNECTED);
- chan->next_tx_seq = 0;
- chan->expected_tx_seq = 0;
- skb_queue_head_init(&chan->tx_q);
- if (chan->mode == L2CAP_MODE_ERTM)
- l2cap_ertm_init(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);
- l2cap_chan_ready(chan);
goto unlock;
}
unlock:
l2cap_chan_unlock(chan);
- return 0;
+ 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 = cmd->len - sizeof(*rsp);
+ 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",
- scid, flags, 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;
- l2cap_chan_lock(chan);
-
switch (result) {
case L2CAP_CONF_SUCCESS:
l2cap_conf_rfc_get(chan, rsp->data, len);
set_default_fcs(chan);
l2cap_state_change(chan, BT_CONNECTED);
- chan->next_tx_seq = 0;
- chan->expected_tx_seq = 0;
- skb_queue_head_init(&chan->tx_q);
- if (chan->mode == L2CAP_MODE_ERTM)
- l2cap_ertm_init(chan);
+ if (chan->mode == L2CAP_MODE_ERTM ||
+ chan->mode == L2CAP_MODE_STREAMING)
+ err = l2cap_ertm_init(chan);
- l2cap_chan_ready(chan);
+ if (err < 0)
+ l2cap_send_disconn_req(chan->conn, chan, -err);
+ else
+ l2cap_chan_ready(chan);
}
done:
l2cap_chan_unlock(chan);
- return 0;
+ return err;
}
static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
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->data);
+ l2cap_chan_put(chan);
mutex_unlock(&conn->chan_lock);
l2cap_chan_lock(chan);
+ l2cap_chan_hold(chan);
l2cap_chan_del(chan, 0);
l2cap_chan_unlock(chan);
chan->ops->close(chan->data);
+ l2cap_chan_put(chan);
mutex_unlock(&conn->chan_lock);
/* Placeholder: Always reject */
rsp.dcid = 0;
rsp.scid = cpu_to_le16(scid);
- rsp.result = L2CAP_CR_NO_MEM;
- rsp.status = L2CAP_CS_NO_INFO;
+ rsp.result = __constant_cpu_to_le16(L2CAP_CR_NO_MEM);
+ rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP,
sizeof(rsp), &rsp);
return 0;
}
-static inline void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan)
+static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan)
{
- u32 control = 0;
+ struct l2cap_ctrl control;
- chan->frames_sent = 0;
+ BT_DBG("chan %p", chan);
- control |= __set_reqseq(chan, chan->buffer_seq);
+ 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 |= __set_ctrl_super(chan, L2CAP_SUPER_RNR);
- l2cap_send_sframe(chan, control);
- set_bit(CONN_RNR_SENT, &chan->conn_state);
+ control.super = L2CAP_SUPER_RNR;
+ l2cap_send_sframe(chan, &control);
}
- if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
- l2cap_retransmit_frames(chan);
+ 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) &&
- chan->frames_sent == 0) {
- control |= __set_ctrl_super(chan, L2CAP_SUPER_RR);
- l2cap_send_sframe(chan, control);
- }
-}
-
-static int l2cap_add_to_srej_queue(struct l2cap_chan *chan, struct sk_buff *skb, u16 tx_seq, u8 sar)
-{
- struct sk_buff *next_skb;
- int tx_seq_offset, next_tx_seq_offset;
-
- bt_cb(skb)->tx_seq = tx_seq;
- bt_cb(skb)->sar = sar;
-
- next_skb = skb_peek(&chan->srej_q);
-
- tx_seq_offset = __seq_offset(chan, tx_seq, chan->buffer_seq);
-
- while (next_skb) {
- if (bt_cb(next_skb)->tx_seq == tx_seq)
- return -EINVAL;
-
- next_tx_seq_offset = __seq_offset(chan,
- bt_cb(next_skb)->tx_seq, chan->buffer_seq);
-
- if (next_tx_seq_offset > tx_seq_offset) {
- __skb_queue_before(&chan->srej_q, next_skb, skb);
- return 0;
- }
-
- if (skb_queue_is_last(&chan->srej_q, next_skb))
- next_skb = NULL;
- else
- next_skb = skb_queue_next(&chan->srej_q, next_skb);
+ 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);
}
-
- __skb_queue_tail(&chan->srej_q, skb);
-
- return 0;
}
static void append_skb_frag(struct sk_buff *skb,
skb->truesize += new_frag->truesize;
}
-static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb, u32 control)
+static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb,
+ struct l2cap_ctrl *control)
{
int err = -EINVAL;
- switch (__get_ctrl_sar(chan, control)) {
+ switch (control->sar) {
case L2CAP_SAR_UNSEGMENTED:
if (chan->sdu)
break;
return err;
}
-static void l2cap_ertm_enter_local_busy(struct l2cap_chan *chan)
+void l2cap_chan_busy(struct l2cap_chan *chan, int busy)
{
- BT_DBG("chan %p, Enter local busy", chan);
+ u8 event;
- set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
+ if (chan->mode != L2CAP_MODE_ERTM)
+ return;
- __set_ack_timer(chan);
+ event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR;
+ l2cap_tx(chan, NULL, NULL, event);
}
-static void l2cap_ertm_exit_local_busy(struct l2cap_chan *chan)
+static int l2cap_rx_queued_iframes(struct l2cap_chan *chan)
{
- u32 control;
-
- if (!test_bit(CONN_RNR_SENT, &chan->conn_state))
- goto done;
+ int err = 0;
+ /* Pass sequential frames to l2cap_reassemble_sdu()
+ * until a gap is encountered.
+ */
- control = __set_reqseq(chan, chan->buffer_seq);
- control |= __set_ctrl_poll(chan);
- control |= __set_ctrl_super(chan, L2CAP_SUPER_RR);
- l2cap_send_sframe(chan, control);
- chan->retry_count = 1;
+ BT_DBG("chan %p", chan);
- __clear_retrans_timer(chan);
- __set_monitor_timer(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));
- set_bit(CONN_WAIT_F, &chan->conn_state);
+ skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq);
-done:
- clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
- clear_bit(CONN_RNR_SENT, &chan->conn_state);
+ if (!skb)
+ break;
- BT_DBG("chan %p, Exit local busy", chan);
-}
+ 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;
+ }
-void l2cap_chan_busy(struct l2cap_chan *chan, int busy)
-{
- if (chan->mode == L2CAP_MODE_ERTM) {
- if (busy)
- l2cap_ertm_enter_local_busy(chan);
- else
- l2cap_ertm_exit_local_busy(chan);
+ if (skb_queue_empty(&chan->srej_q)) {
+ chan->rx_state = L2CAP_RX_STATE_RECV;
+ l2cap_send_ack(chan);
}
+
+ return err;
}
-static void l2cap_check_srej_gap(struct l2cap_chan *chan, u16 tx_seq)
+static void l2cap_handle_srej(struct l2cap_chan *chan,
+ struct l2cap_ctrl *control)
{
struct sk_buff *skb;
- u32 control;
- while ((skb = skb_peek(&chan->srej_q)) &&
- !test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
- int err;
+ BT_DBG("chan %p, control %p", chan, control);
- if (bt_cb(skb)->tx_seq != tx_seq)
- break;
+ 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 = skb_dequeue(&chan->srej_q);
- control = __set_ctrl_sar(chan, bt_cb(skb)->sar);
- err = l2cap_reassemble_sdu(chan, skb, control);
+ skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
- if (err < 0) {
- l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
- break;
- }
+ 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);
- chan->buffer_seq_srej = __next_seq(chan, chan->buffer_seq_srej);
- tx_seq = __next_seq(chan, tx_seq);
- }
-}
+ set_bit(CONN_SEND_FBIT, &chan->conn_state);
+ l2cap_retransmit(chan, control);
+ l2cap_ertm_send(chan);
-static void l2cap_resend_srejframe(struct l2cap_chan *chan, u16 tx_seq)
-{
- struct srej_list *l, *tmp;
- u32 control;
+ 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);
- list_for_each_entry_safe(l, tmp, &chan->srej_l, list) {
- if (l->tx_seq == tx_seq) {
- list_del(&l->list);
- kfree(l);
- return;
+ 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;
+ }
}
- control = __set_ctrl_super(chan, L2CAP_SUPER_SREJ);
- control |= __set_reqseq(chan, l->tx_seq);
- l2cap_send_sframe(chan, control);
- list_del(&l->list);
- list_add_tail(&l->list, &chan->srej_l);
}
}
-static int l2cap_send_srejframe(struct l2cap_chan *chan, u16 tx_seq)
+static void l2cap_handle_rej(struct l2cap_chan *chan,
+ struct l2cap_ctrl *control)
{
- struct srej_list *new;
- u32 control;
-
- while (tx_seq != chan->expected_tx_seq) {
- control = __set_ctrl_super(chan, L2CAP_SUPER_SREJ);
- control |= __set_reqseq(chan, chan->expected_tx_seq);
- l2cap_send_sframe(chan, control);
+ struct sk_buff *skb;
- new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC);
- if (!new)
- return -ENOMEM;
+ BT_DBG("chan %p, control %p", chan, control);
- new->tx_seq = chan->expected_tx_seq;
+ if (control->reqseq == chan->next_tx_seq) {
+ BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
+ l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
+ return;
+ }
- chan->expected_tx_seq = __next_seq(chan, chan->expected_tx_seq);
+ skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
- list_add_tail(&new->list, &chan->srej_l);
+ 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;
}
- chan->expected_tx_seq = __next_seq(chan, chan->expected_tx_seq);
+ clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
- return 0;
+ 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 inline int l2cap_data_channel_iframe(struct l2cap_chan *chan, u32 rx_control, struct sk_buff *skb)
+static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq)
{
- u16 tx_seq = __get_txseq(chan, rx_control);
- u16 req_seq = __get_reqseq(chan, rx_control);
- u8 sar = __get_ctrl_sar(chan, rx_control);
- int tx_seq_offset, expected_tx_seq_offset;
- int num_to_ack = (chan->tx_win/6) + 1;
- int err = 0;
+ BT_DBG("chan %p, txseq %d", chan, txseq);
- BT_DBG("chan %p len %d tx_seq %d rx_control 0x%8.8x", chan, skb->len,
- tx_seq, rx_control);
+ BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq,
+ chan->expected_tx_seq);
- if (__is_ctrl_final(chan, rx_control) &&
- test_bit(CONN_WAIT_F, &chan->conn_state)) {
- __clear_monitor_timer(chan);
- if (chan->unacked_frames > 0)
- __set_retrans_timer(chan);
- clear_bit(CONN_WAIT_F, &chan->conn_state);
- }
+ 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;
+ }
+ }
- chan->expected_ack_seq = req_seq;
- l2cap_drop_acked_frames(chan);
+ if (chan->srej_list.head == txseq) {
+ BT_DBG("Expected SREJ");
+ return L2CAP_TXSEQ_EXPECTED_SREJ;
+ }
- tx_seq_offset = __seq_offset(chan, tx_seq, chan->buffer_seq);
+ if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) {
+ BT_DBG("Duplicate SREJ - txseq already stored");
+ return L2CAP_TXSEQ_DUPLICATE_SREJ;
+ }
- /* invalid tx_seq */
- if (tx_seq_offset >= chan->tx_win) {
- l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
- goto drop;
+ if (l2cap_seq_list_contains(&chan->srej_list, txseq)) {
+ BT_DBG("Unexpected SREJ - not requested");
+ return L2CAP_TXSEQ_UNEXPECTED_SREJ;
+ }
}
- if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
- if (!test_bit(CONN_RNR_SENT, &chan->conn_state))
- l2cap_send_ack(chan);
- goto drop;
+ 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 (tx_seq == chan->expected_tx_seq)
- goto 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;
+ }
+}
- if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) {
- struct srej_list *first;
+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;
- first = list_first_entry(&chan->srej_l,
- struct srej_list, list);
- if (tx_seq == first->tx_seq) {
- l2cap_add_to_srej_queue(chan, skb, tx_seq, sar);
- l2cap_check_srej_gap(chan, tx_seq);
+ BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
+ event);
- list_del(&first->list);
- kfree(first);
+ 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 (list_empty(&chan->srej_l)) {
- chan->buffer_seq = chan->buffer_seq_srej;
- clear_bit(CONN_SREJ_SENT, &chan->conn_state);
- l2cap_send_ack(chan);
- BT_DBG("chan %p, Exit SREJ_SENT", chan);
+ if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
+ BT_DBG("Busy, discarding expected seq %d",
+ control->txseq);
+ break;
}
- } else {
- struct srej_list *l;
- /* duplicated tx_seq */
- if (l2cap_add_to_srej_queue(chan, skb, tx_seq, sar) < 0)
- goto drop;
+ chan->expected_tx_seq = __next_seq(chan,
+ control->txseq);
- list_for_each_entry(l, &chan->srej_l, list) {
- if (l->tx_seq == tx_seq) {
- l2cap_resend_srejframe(chan, tx_seq);
- return 0;
+ 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);
}
}
- err = l2cap_send_srejframe(chan, tx_seq);
- if (err < 0) {
- l2cap_send_disconn_req(chan->conn, chan, -err);
- return err;
+ 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;
}
- }
- } else {
- expected_tx_seq_offset = __seq_offset(chan,
- chan->expected_tx_seq, chan->buffer_seq);
- /* duplicated tx_seq */
- if (tx_seq_offset < expected_tx_seq_offset)
- goto drop;
-
- set_bit(CONN_SREJ_SENT, &chan->conn_state);
+ /* 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));
- BT_DBG("chan %p, Enter SREJ", chan);
+ clear_bit(CONN_SREJ_ACT, &chan->conn_state);
+ l2cap_seq_list_clear(&chan->srej_list);
+ l2cap_send_srej(chan, control->txseq);
- INIT_LIST_HEAD(&chan->srej_l);
- chan->buffer_seq_srej = chan->buffer_seq;
+ 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);
- __skb_queue_head_init(&chan->srej_q);
- l2cap_add_to_srej_queue(chan, skb, tx_seq, sar);
+ if (!test_and_clear_bit(CONN_REJ_ACT,
+ &chan->conn_state)) {
+ control->final = 0;
+ l2cap_retransmit_all(chan, control);
+ }
- /* Set P-bit only if there are some I-frames to ack. */
- if (__clear_ack_timer(chan))
- set_bit(CONN_SEND_PBIT, &chan->conn_state);
+ 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);
- err = l2cap_send_srejframe(chan, tx_seq);
- if (err < 0) {
- l2cap_send_disconn_req(chan->conn, chan, -err);
- return err;
+ 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;
}
- return 0;
-
-expected:
- chan->expected_tx_seq = __next_seq(chan, chan->expected_tx_seq);
-
- if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) {
- bt_cb(skb)->tx_seq = tx_seq;
- bt_cb(skb)->sar = sar;
- __skb_queue_tail(&chan->srej_q, skb);
- return 0;
- }
-
- err = l2cap_reassemble_sdu(chan, skb, rx_control);
- chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
- if (err < 0) {
- l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
- return err;
+ if (skb && !skb_in_use) {
+ BT_DBG("Freeing %p", skb);
+ kfree_skb(skb);
}
- if (__is_ctrl_final(chan, rx_control)) {
- if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state))
- l2cap_retransmit_frames(chan);
- }
+ 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);
- chan->num_acked = (chan->num_acked + 1) % num_to_ack;
- if (chan->num_acked == num_to_ack - 1)
- l2cap_send_ack(chan);
- else
- __set_ack_timer(chan);
+ 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));
- return 0;
+ err = l2cap_rx_queued_iframes(chan);
+ if (err)
+ break;
-drop:
- kfree_skb(skb);
- return 0;
-}
+ 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);
-static inline void l2cap_data_channel_rrframe(struct l2cap_chan *chan, u32 rx_control)
-{
- BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan,
- __get_reqseq(chan, rx_control), rx_control);
+ if (!test_and_clear_bit(CONN_REJ_ACT,
+ &chan->conn_state)) {
+ control->final = 0;
+ l2cap_retransmit_all(chan, control);
+ }
- chan->expected_ack_seq = __get_reqseq(chan, rx_control);
- l2cap_drop_acked_frames(chan);
+ 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);
+ }
- if (__is_ctrl_poll(chan, rx_control)) {
- set_bit(CONN_SEND_FBIT, &chan->conn_state);
- if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) {
- if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) &&
- (chan->unacked_frames > 0))
+ 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);
- clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
- l2cap_send_srejtail(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 {
- l2cap_send_i_or_rr_or_rnr(chan);
+ 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);
}
- } else if (__is_ctrl_final(chan, rx_control)) {
- clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
-
- if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state))
- l2cap_retransmit_frames(chan);
-
- } else {
- if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) &&
- (chan->unacked_frames > 0))
- __set_retrans_timer(chan);
+ break;
+ case L2CAP_EV_RECV_REJ:
+ l2cap_handle_rej(chan, control);
+ break;
+ case L2CAP_EV_RECV_SREJ:
+ l2cap_handle_srej(chan, control);
+ break;
+ }
- clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
- if (test_bit(CONN_SREJ_SENT, &chan->conn_state))
- l2cap_send_ack(chan);
- else
- l2cap_ertm_send(chan);
+ if (skb && !skb_in_use) {
+ BT_DBG("Freeing %p", skb);
+ kfree_skb(skb);
}
+
+ return err;
}
-static inline void l2cap_data_channel_rejframe(struct l2cap_chan *chan, u32 rx_control)
+static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq)
{
- u16 tx_seq = __get_reqseq(chan, rx_control);
-
- BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, tx_seq, rx_control);
-
- clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
-
- chan->expected_ack_seq = tx_seq;
- l2cap_drop_acked_frames(chan);
-
- if (__is_ctrl_final(chan, rx_control)) {
- if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state))
- l2cap_retransmit_frames(chan);
- } else {
- l2cap_retransmit_frames(chan);
+ /* Make sure reqseq is for a packet that has been sent but not acked */
+ u16 unacked;
- if (test_bit(CONN_WAIT_F, &chan->conn_state))
- set_bit(CONN_REJ_ACT, &chan->conn_state);
- }
+ unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq);
+ return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked;
}
-static inline void l2cap_data_channel_srejframe(struct l2cap_chan *chan, u32 rx_control)
-{
- u16 tx_seq = __get_reqseq(chan, rx_control);
-
- BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, tx_seq, rx_control);
-
- clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
- if (__is_ctrl_poll(chan, rx_control)) {
- chan->expected_ack_seq = tx_seq;
- l2cap_drop_acked_frames(chan);
-
- set_bit(CONN_SEND_FBIT, &chan->conn_state);
- l2cap_retransmit_one_frame(chan, tx_seq);
+static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
+ struct sk_buff *skb, u8 event)
+{
+ int err = 0;
- l2cap_ertm_send(chan);
+ BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan,
+ control, skb, event, chan->rx_state);
- if (test_bit(CONN_WAIT_F, &chan->conn_state)) {
- chan->srej_save_reqseq = tx_seq;
- set_bit(CONN_SREJ_ACT, &chan->conn_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;
+ default:
+ /* shut it down */
+ break;
}
- } else if (__is_ctrl_final(chan, rx_control)) {
- if (test_bit(CONN_SREJ_ACT, &chan->conn_state) &&
- chan->srej_save_reqseq == tx_seq)
- clear_bit(CONN_SREJ_ACT, &chan->conn_state);
- else
- l2cap_retransmit_one_frame(chan, tx_seq);
} else {
- l2cap_retransmit_one_frame(chan, tx_seq);
- if (test_bit(CONN_WAIT_F, &chan->conn_state)) {
- chan->srej_save_reqseq = tx_seq;
- set_bit(CONN_SREJ_ACT, &chan->conn_state);
- }
+ 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 inline void l2cap_data_channel_rnrframe(struct l2cap_chan *chan, u32 rx_control)
+static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
+ struct sk_buff *skb)
{
- u16 tx_seq = __get_reqseq(chan, rx_control);
+ int err = 0;
- BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, tx_seq, rx_control);
+ BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb,
+ chan->rx_state);
- set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
- chan->expected_ack_seq = tx_seq;
- l2cap_drop_acked_frames(chan);
+ if (l2cap_classify_txseq(chan, control->txseq) ==
+ L2CAP_TXSEQ_EXPECTED) {
+ l2cap_pass_to_tx(chan, control);
- if (__is_ctrl_poll(chan, rx_control))
- set_bit(CONN_SEND_FBIT, &chan->conn_state);
+ BT_DBG("buffer_seq %d->%d", chan->buffer_seq,
+ __next_seq(chan, chan->buffer_seq));
- if (!test_bit(CONN_SREJ_SENT, &chan->conn_state)) {
- __clear_retrans_timer(chan);
- if (__is_ctrl_poll(chan, rx_control))
- l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_FINAL);
- return;
- }
+ chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
- if (__is_ctrl_poll(chan, rx_control)) {
- l2cap_send_srejtail(chan);
+ l2cap_reassemble_sdu(chan, skb, control);
} else {
- rx_control = __set_ctrl_super(chan, L2CAP_SUPER_RR);
- l2cap_send_sframe(chan, rx_control);
- }
-}
-
-static inline int l2cap_data_channel_sframe(struct l2cap_chan *chan, u32 rx_control, struct sk_buff *skb)
-{
- BT_DBG("chan %p rx_control 0x%8.8x len %d", chan, rx_control, skb->len);
+ if (chan->sdu) {
+ kfree_skb(chan->sdu);
+ chan->sdu = NULL;
+ }
+ chan->sdu_last_frag = NULL;
+ chan->sdu_len = 0;
- if (__is_ctrl_final(chan, rx_control) &&
- test_bit(CONN_WAIT_F, &chan->conn_state)) {
- __clear_monitor_timer(chan);
- if (chan->unacked_frames > 0)
- __set_retrans_timer(chan);
- clear_bit(CONN_WAIT_F, &chan->conn_state);
+ if (skb) {
+ BT_DBG("Freeing %p", skb);
+ kfree_skb(skb);
+ }
}
- switch (__get_ctrl_super(chan, rx_control)) {
- case L2CAP_SUPER_RR:
- l2cap_data_channel_rrframe(chan, rx_control);
- break;
-
- case L2CAP_SUPER_REJ:
- l2cap_data_channel_rejframe(chan, rx_control);
- break;
-
- case L2CAP_SUPER_SREJ:
- l2cap_data_channel_srejframe(chan, rx_control);
- break;
-
- case L2CAP_SUPER_RNR:
- l2cap_data_channel_rnrframe(chan, rx_control);
- break;
- }
+ chan->last_acked_seq = control->txseq;
+ chan->expected_tx_seq = __next_seq(chan, control->txseq);
- kfree_skb(skb);
- return 0;
+ return err;
}
-static int l2cap_ertm_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb)
+static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb)
{
- u32 control;
- u16 req_seq;
- int len, next_tx_seq_offset, req_seq_offset;
+ struct l2cap_ctrl *control = &bt_cb(skb)->control;
+ u16 len;
+ u8 event;
+
+ __unpack_control(chan, skb);
- control = __get_control(chan, skb->data);
- skb_pull(skb, __ctrl_size(chan));
len = skb->len;
/*
* We can just drop the corrupted I-frame here.
* Receiver will miss it and start proper recovery
- * procedures and ask retransmission.
+ * procedures and ask for retransmission.
*/
if (l2cap_check_fcs(chan, skb))
goto drop;
- if (__is_sar_start(chan, control) && !__is_sframe(chan, control))
+ if (!control->sframe && control->sar == L2CAP_SAR_START)
len -= L2CAP_SDULEN_SIZE;
if (chan->fcs == L2CAP_FCS_CRC16)
goto drop;
}
- req_seq = __get_reqseq(chan, control);
-
- req_seq_offset = __seq_offset(chan, req_seq, chan->expected_ack_seq);
-
- next_tx_seq_offset = __seq_offset(chan, chan->next_tx_seq,
- chan->expected_ack_seq);
+ if (!control->sframe) {
+ int err;
- /* check for invalid req-seq */
- if (req_seq_offset > next_tx_seq_offset) {
- l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
- goto drop;
- }
+ BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d",
+ control->sar, control->reqseq, control->final,
+ control->txseq);
- if (!__is_sframe(chan, control)) {
- if (len < 0) {
- l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
+ /* 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);
}
- l2cap_data_channel_iframe(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;
}
- l2cap_data_channel_sframe(chan, control, skb);
+ /* 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;
static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb)
{
struct l2cap_chan *chan;
- u32 control;
- u16 tx_seq;
- int len;
chan = l2cap_get_chan_by_scid(conn, cid);
if (!chan) {
return 0;
}
- l2cap_chan_lock(chan);
-
BT_DBG("chan %p, len %d", chan, skb->len);
if (chan->state != BT_CONNECTED)
break;
case L2CAP_MODE_ERTM:
- l2cap_ertm_data_rcv(chan, skb);
-
- goto done;
-
case L2CAP_MODE_STREAMING:
- control = __get_control(chan, skb->data);
- skb_pull(skb, __ctrl_size(chan));
- len = skb->len;
-
- if (l2cap_check_fcs(chan, skb))
- goto drop;
-
- if (__is_sar_start(chan, control))
- len -= L2CAP_SDULEN_SIZE;
-
- if (chan->fcs == L2CAP_FCS_CRC16)
- len -= L2CAP_FCS_SIZE;
-
- if (len > chan->mps || len < 0 || __is_sframe(chan, control))
- goto drop;
-
- tx_seq = __get_txseq(chan, control);
-
- if (chan->expected_tx_seq != tx_seq) {
- /* Frame(s) missing - must discard partial SDU */
- kfree_skb(chan->sdu);
- chan->sdu = NULL;
- chan->sdu_last_frag = NULL;
- chan->sdu_len = 0;
-
- /* TODO: Notify userland of missing data */
- }
-
- chan->expected_tx_seq = __next_seq(chan, tx_seq);
-
- if (l2cap_reassemble_sdu(chan, skb, control) == -EMSGSIZE)
- l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
-
+ l2cap_data_rcv(chan, skb);
goto done;
default:
{
struct l2cap_chan *chan;
- chan = l2cap_global_chan_by_psm(0, psm, conn->src);
+ chan = l2cap_global_chan_by_psm(0, psm, conn->src, conn->dst);
if (!chan)
goto drop;
return 0;
}
-static inline int l2cap_att_channel(struct l2cap_conn *conn, __le16 cid, struct sk_buff *skb)
+static inline int 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);
+ chan = l2cap_global_chan_by_scid(0, cid, conn->src, conn->dst);
if (!chan)
goto drop;
break;
case L2CAP_CID_CONN_LESS:
- psm = get_unaligned_le16(skb->data);
+ psm = get_unaligned((__le16 *) skb->data);
skb_pull(skb, 2);
l2cap_conless_channel(conn, psm, skb);
break;
if (encrypt == 0x00) {
if (chan->sec_level == BT_SECURITY_MEDIUM) {
- __clear_chan_timer(chan);
__set_chan_timer(chan, L2CAP_ENC_TIMEOUT);
} else if (chan->sec_level == BT_SECURITY_HIGH)
l2cap_chan_close(chan, ECONNREFUSED);
BT_DBG("conn %p", conn);
if (hcon->type == LE_LINK) {
- smp_distribute_keys(conn, 0);
+ if (!status && encrypt)
+ smp_distribute_keys(conn, 0);
cancel_delayed_work(&conn->security_timer);
}
chan->state == BT_CONFIG)) {
struct sock *sk = chan->sk;
- bt_sk(sk)->suspended = false;
+ clear_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
sk->sk_state_change(sk);
l2cap_check_encryption(chan, encrypt);
if (!status) {
l2cap_send_conn_req(chan);
} else {
- __clear_chan_timer(chan);
__set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
}
} else if (chan->state == BT_CONNECT2) {
lock_sock(sk);
if (!status) {
- if (bt_sk(sk)->defer_setup) {
+ if (test_bit(BT_SK_DEFER_SETUP,
+ &bt_sk(sk)->flags)) {
struct sock *parent = bt_sk(sk)->parent;
res = L2CAP_CR_PEND;
stat = L2CAP_CS_AUTHOR_PEND;
if (!(flags & ACL_CONT)) {
struct l2cap_hdr *hdr;
- struct l2cap_chan *chan;
- u16 cid;
int len;
if (conn->rx_len) {
hdr = (struct l2cap_hdr *) skb->data;
len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
- cid = __le16_to_cpu(hdr->cid);
if (len == skb->len) {
/* Complete frame received */
goto drop;
}
- chan = l2cap_get_chan_by_scid(conn, cid);
-
- if (chan && chan->sk) {
- struct sock *sk = chan->sk;
- lock_sock(sk);
-
- if (chan->imtu < len - L2CAP_HDR_SIZE) {
- BT_ERR("Frame exceeding recv MTU (len %d, "
- "MTU %d)", len,
- chan->imtu);
- release_sock(sk);
- l2cap_conn_unreliable(conn, ECOMM);
- goto drop;
- }
- release_sock(sk);
- }
-
/* Allocate skb for the complete frame (with header) */
conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC);
if (!conn->rx_skb)
projects / profile / ivi / kernel-adaptation-intel-automotive.git / blobdiff