Bluetooth: Read RFC conf option on a successful Conf RSP

On Enhanced Retransmission Mode and Streaming Mode a entity can send, on
a successful Conf RSP, new values for the RFC fields. For example, the
entity can send txWindow and MPS values less than the value received on
a Conf REQ.

Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
Reviewed-by: João Paulo Rechi Vita <jprvita@profusion.mobi>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 38 insertions, 1 deletions

diff --git a/net/bluetooth/l2cap.c b/net/bluetooth/l2cap.c
index f604405fe667..c50c05738fb6 100644
--- a/net/bluetooth/l2cap.c
+++ b/net/bluetooth/l2cap.c
@@ -2602,6 +2602,42 @@ static int l2cap_build_conf_rsp(struct sock *sk, void *data, u16 result, u16 fla
         return ptr - data;
 }
 
+static void l2cap_conf_rfc_get(struct sock *sk, void *rsp, int len)
+{
+        struct l2cap_pinfo *pi = l2cap_pi(sk);
+        int type, olen;
+        unsigned long val;
+        struct l2cap_conf_rfc rfc;
+
+        BT_DBG("sk %p, rsp %p, len %d", sk, rsp, len);
+
+        if ((pi->mode != L2CAP_MODE_ERTM) && (pi->mode != L2CAP_MODE_STREAMING))
+                return;
+
+        while (len >= L2CAP_CONF_OPT_SIZE) {
+                len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
+
+                switch (type) {
+                case L2CAP_CONF_RFC:
+                        if (olen == sizeof(rfc))
+                                memcpy(&rfc, (void *)val, olen);
+                        goto done;
+                }
+        }
+
+done:
+        switch (rfc.mode) {
+        case L2CAP_MODE_ERTM:
+                pi->remote_tx_win   = rfc.txwin_size;
+                pi->retrans_timeout = rfc.retrans_timeout;
+                pi->monitor_timeout = rfc.monitor_timeout;
+                pi->mps    = le16_to_cpu(rfc.max_pdu_size);
+                break;
+        case L2CAP_MODE_STREAMING:
+                pi->mps    = le16_to_cpu(rfc.max_pdu_size);
+        }
+}
+
 static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
 {
         struct l2cap_cmd_rej *rej = (struct l2cap_cmd_rej *) data;
@@ -2881,6 +2917,7 @@ static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr
         struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
         u16 scid, flags, result;
         struct sock *sk;
+        int len = cmd->len - sizeof(*rsp);
 
         scid   = __le16_to_cpu(rsp->scid);
         flags  = __le16_to_cpu(rsp->flags);
@@ -2895,11 +2932,11 @@ static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr
 
         switch (result) {
         case L2CAP_CONF_SUCCESS:
+                l2cap_conf_rfc_get(sk, rsp->data, len);
                 break;
 
         case L2CAP_CONF_UNACCEPT:
                 if (l2cap_pi(sk)->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) {
-                        int len = cmd->len - sizeof(*rsp);
                         char req[64];
 
                         if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) {