From 836be934218eb80abc5515d584c329c26951086f Mon Sep 17 00:00:00 2001 From: Andrei Emeltchenko Date: Mon, 17 Oct 2011 12:19:57 +0300 Subject: [PATCH] Bluetooth: EWS: support extended seq numbers Adds support for extended sequence numbers found in extended control fields. Signed-off-by: Andrei Emeltchenko Signed-off-by: Gustavo F. Padovan --- 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 e727555d4ee9..fb1acb3454ae 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 41f0906649ee..fddc82afeafc 100644 --- a/include/net/bluetooth/l2cap.h +++ b/include/net/bluetooth/l2cap.h @@ -381,6 +381,7 @@ struct l2cap_chan { __u8 fcs; __u16 tx_win; + __u16 tx_win_max; __u8 max_tx; __u16 retrans_timeout; __u16 monitor_timeout; @@ -543,6 +544,22 @@ 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 a25394231b48..86c8720043ea 100644 --- a/net/bluetooth/l2cap_core.c +++ b/net/bluetooth/l2cap_core.c @@ -1295,7 +1295,7 @@ 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); } } @@ -1389,7 +1389,8 @@ 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++; @@ -1967,12 +1968,15 @@ static inline bool __l2cap_efs_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) @@ -2138,6 +2142,7 @@ 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; @@ -3225,18 +3230,14 @@ 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); @@ -3426,9 +3427,8 @@ 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); } } @@ -3463,10 +3463,13 @@ 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) @@ -3492,9 +3495,7 @@ 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) { @@ -3542,10 +3543,8 @@ 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) @@ -3570,7 +3569,7 @@ 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; @@ -3580,7 +3579,8 @@ 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; @@ -3794,14 +3794,11 @@ 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) { @@ -3907,7 +3904,7 @@ 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); -- 2.30.2