From: Andrei Emeltchenko <andrei.emeltchenko@xxxxxxxxx>
Adds support for extended sequence numbers found in
extended control fields.
Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@xxxxxxxxx>
---
include/net/bluetooth/bluetooth.h | 2 +-
include/net/bluetooth/l2cap.h | 17 ++++++++++
net/bluetooth/l2cap_core.c | 63 +++++++++++++++++-------------------
3 files changed, 48 insertions(+), 34 deletions(-)
diff --git a/include/net/bluetooth/bluetooth.h b/include/net/bluetooth/bluetooth.h
index e727555..fb1acb3 100644
--- a/include/net/bluetooth/bluetooth.h
+++ b/include/net/bluetooth/bluetooth.h
@@ -158,7 +158,7 @@ struct bt_skb_cb {
__u8 pkt_type;
__u8 incoming;
__u16 expect;
- __u8 tx_seq;
+ __u16 tx_seq;
__u8 retries;
__u8 sar;
unsigned short channel;
diff --git a/include/net/bluetooth/l2cap.h b/include/net/bluetooth/l2cap.h
index 8324cac..bf590b0 100644
--- a/include/net/bluetooth/l2cap.h
+++ b/include/net/bluetooth/l2cap.h
@@ -361,6 +361,7 @@ struct l2cap_chan {
__u8 fcs;
__u16 tx_win;
+ __u16 tx_win_max;
__u8 max_tx;
__u16 retrans_timeout;
__u16 monitor_timeout;
@@ -508,6 +509,22 @@ enum {
L2CAP_DEFAULT_ACK_TO);
#define __clear_ack_timer(c) l2cap_clear_timer(c, &c->ack_timer)
+static inline int __seq_offset(struct l2cap_chan *chan, __u16 seq1, __u16 seq2)
+{
+ int offset;
+
+ offset = (seq1 - seq2) % (chan->tx_win_max + 1);
+ if (offset < 0)
+ offset += (chan->tx_win_max + 1);
+
+ return offset;
+}
+
+static inline __u16 __next_seq(struct l2cap_chan *chan, __u16 seq)
+{
+ return (seq + 1) % (chan->tx_win_max + 1);
+}
+
static inline int l2cap_tx_window_full(struct l2cap_chan *ch)
{
int sub;
diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
index 520d30f..6a668ba 100644
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -1288,7 +1288,7 @@ static void l2cap_streaming_send(struct l2cap_chan *chan)
l2cap_do_send(chan, skb);
- chan->next_tx_seq = (chan->next_tx_seq + 1) % 64;
+ chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
}
}
@@ -1382,7 +1382,8 @@ static int l2cap_ertm_send(struct l2cap_chan *chan)
__set_retrans_timer(chan);
bt_cb(skb)->tx_seq = chan->next_tx_seq;
- chan->next_tx_seq = (chan->next_tx_seq + 1) % 64;
+
+ chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
if (bt_cb(skb)->retries == 1)
chan->unacked_frames++;
@@ -1924,12 +1925,15 @@ static inline bool __l2cap_ews_supported(struct l2cap_chan *chan)
static inline void l2cap_txwin_setup(struct l2cap_chan *chan)
{
if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW &&
- __l2cap_ews_supported(chan))
+ __l2cap_ews_supported(chan)) {
/* use extended control field */
set_bit(FLAG_EXT_CTRL, &chan->flags);
- else
+ 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;
+ }
}
static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data)
@@ -2086,6 +2090,7 @@ static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data)
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;
@@ -3173,18 +3178,14 @@ static int l2cap_add_to_srej_queue(struct l2cap_chan *chan, struct sk_buff *skb,
return 0;
}
- tx_seq_offset = (tx_seq - chan->buffer_seq) % 64;
- if (tx_seq_offset < 0)
- tx_seq_offset += 64;
+ tx_seq_offset = __seq_offset(chan, tx_seq, chan->buffer_seq);
do {
if (bt_cb(next_skb)->tx_seq == tx_seq)
return -EINVAL;
- next_tx_seq_offset = (bt_cb(next_skb)->tx_seq -
- chan->buffer_seq) % 64;
- if (next_tx_seq_offset < 0)
- next_tx_seq_offset += 64;
+ 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);
@@ -3374,9 +3375,8 @@ static void l2cap_check_srej_gap(struct l2cap_chan *chan, u16 tx_seq)
break;
}
- chan->buffer_seq_srej =
- (chan->buffer_seq_srej + 1) % 64;
- tx_seq = (tx_seq + 1) % 64;
+ chan->buffer_seq_srej = __next_seq(chan, chan->buffer_seq_srej);
+ tx_seq = __next_seq(chan, tx_seq);
}
}
@@ -3411,10 +3411,13 @@ static void l2cap_send_srejframe(struct l2cap_chan *chan, u16 tx_seq)
new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC);
new->tx_seq = chan->expected_tx_seq;
- chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64;
+
+ chan->expected_tx_seq = __next_seq(chan, chan->expected_tx_seq);
+
list_add_tail(&new->list, &chan->srej_l);
}
- chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64;
+
+ chan->expected_tx_seq = __next_seq(chan, chan->expected_tx_seq);
}
static inline int l2cap_data_channel_iframe(struct l2cap_chan *chan, u32 rx_control, struct sk_buff *skb)
@@ -3440,9 +3443,7 @@ static inline int l2cap_data_channel_iframe(struct l2cap_chan *chan, u32 rx_cont
chan->expected_ack_seq = req_seq;
l2cap_drop_acked_frames(chan);
- tx_seq_offset = (tx_seq - chan->buffer_seq) % 64;
- if (tx_seq_offset < 0)
- tx_seq_offset += 64;
+ tx_seq_offset = __seq_offset(chan, tx_seq, chan->buffer_seq);
/* invalid tx_seq */
if (tx_seq_offset >= chan->tx_win) {
@@ -3490,10 +3491,8 @@ static inline int l2cap_data_channel_iframe(struct l2cap_chan *chan, u32 rx_cont
l2cap_send_srejframe(chan, tx_seq);
}
} else {
- expected_tx_seq_offset =
- (chan->expected_tx_seq - chan->buffer_seq) % 64;
- if (expected_tx_seq_offset < 0)
- expected_tx_seq_offset += 64;
+ 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)
@@ -3518,7 +3517,7 @@ static inline int l2cap_data_channel_iframe(struct l2cap_chan *chan, u32 rx_cont
return 0;
expected:
- chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64;
+ 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;
@@ -3528,7 +3527,8 @@ expected:
}
err = l2cap_reassemble_sdu(chan, skb, rx_control);
- chan->buffer_seq = (chan->buffer_seq + 1) % 64;
+ chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
+
if (err < 0) {
l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
return err;
@@ -3742,14 +3742,11 @@ static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb)
}
req_seq = __get_reqseq(chan, control);
- req_seq_offset = (req_seq - chan->expected_ack_seq) % 64;
- if (req_seq_offset < 0)
- req_seq_offset += 64;
- next_tx_seq_offset =
- (chan->next_tx_seq - chan->expected_ack_seq) % 64;
- if (next_tx_seq_offset < 0)
- next_tx_seq_offset += 64;
+ 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);
/* check for invalid req-seq */
if (req_seq_offset > next_tx_seq_offset) {
@@ -3855,7 +3852,7 @@ static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk
/* TODO: Notify userland of missing data */
}
- chan->expected_tx_seq = (tx_seq + 1) % 64;
+ 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);
--
1.7.4.1
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