Bluetooth: Add support for L2CAP SREJ exception

When L2CAP loses an I-frame we send a SREJ frame to the transmitter side
requesting the lost packet. This patch implement all Recv I-frame events
on SREJ_SENT state table except the ones that deal with SendRej (the REJ
exception at receiver side is yet not implemented).

Signed-off-by: Gustavo F. Padovan <gustavo@las.ic.unicamp.br>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

2 files changed, 14 insertions, 1 deletions

diff --git a/include/net/bluetooth/bluetooth.h b/include/net/bluetooth/bluetooth.h
index b8b9a8479525..718394e2c01e 100644
--- a/include/net/bluetooth/bluetooth.h
+++ b/include/net/bluetooth/bluetooth.h
@@ -140,6 +140,7 @@ struct bt_skb_cb {
         __u8 incoming;
         __u8 tx_seq;
         __u8 retries;
+        __u8 sar;
 };
 #define bt_cb(skb) ((struct bt_skb_cb *)((skb)->cb))
 
diff --git a/include/net/bluetooth/l2cap.h b/include/net/bluetooth/l2cap.h
index 59b26bf10f30..9f2126a4f6f5 100644
--- a/include/net/bluetooth/l2cap.h
+++ b/include/net/bluetooth/l2cap.h
@@ -108,6 +108,7 @@ struct l2cap_conninfo {
 
 #define L2CAP_CTRL_TXSEQ_SHIFT      1
 #define L2CAP_CTRL_REQSEQ_SHIFT     8
+#define L2CAP_CTRL_SAR_SHIFT       14
 
 /* L2CAP Supervisory Function */
 #define L2CAP_SUPER_RCV_READY           0x0000
@@ -290,6 +291,13 @@ struct l2cap_conn {
 /* ----- L2CAP channel and socket info ----- */
 #define l2cap_pi(sk) ((struct l2cap_pinfo *) sk)
 #define TX_QUEUE(sk) (&l2cap_pi(sk)->tx_queue)
+#define SREJ_QUEUE(sk) (&l2cap_pi(sk)->srej_queue)
+#define SREJ_LIST(sk) (&l2cap_pi(sk)->srej_l.list)
+
+struct srej_list {
+        __u8    tx_seq;
+        struct list_head list;
+};
 
 struct l2cap_pinfo {
         struct bt_sock  bt;
@@ -318,6 +326,8 @@ struct l2cap_pinfo {
         __u8            expected_ack_seq;
         __u8            req_seq;
         __u8            expected_tx_seq;
+        __u8            buffer_seq;
+        __u8            buffer_seq_srej;
         __u8            unacked_frames;
         __u8            retry_count;
         __u8            num_to_ack;
@@ -338,6 +348,8 @@ struct l2cap_pinfo {
         struct timer_list       retrans_timer;
         struct timer_list       monitor_timer;
         struct sk_buff_head     tx_queue;
+        struct sk_buff_head     srej_queue;
+        struct srej_list        srej_l;
         struct l2cap_conn       *conn;
         struct sock             *next_c;
         struct sock             *prev_c;
@@ -356,7 +368,7 @@ struct l2cap_pinfo {
 #define L2CAP_CONF_MAX_CONF_RSP 2
 
 #define L2CAP_CONN_SAR_SDU         0x01
-#define L2CAP_CONN_UNDER_REJ       0x02
+#define L2CAP_CONN_SREJ_SENT       0x02
 #define L2CAP_CONN_WAIT_F          0x04
 
 #define __mod_retrans_timer() mod_timer(&l2cap_pi(sk)->retrans_timer, \