diff options
Diffstat (limited to 'net/dccp/output.c')
| -rw-r--r-- | net/dccp/output.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/net/dccp/output.c b/net/dccp/output.c index 27c79bcc6a1e..36bcc00654d3 100644 --- a/net/dccp/output.c +++ b/net/dccp/output.c @@ -276,7 +276,20 @@ void dccp_write_xmit(struct sock *sk, int block) const int len = skb->len; if (sk->sk_state == DCCP_PARTOPEN) { - /* See 8.1.5. Handshake Completion */ + const u32 cur_mps = dp->dccps_mss_cache - DCCP_FEATNEG_OVERHEAD; + /* + * See 8.1.5 - Handshake Completion. + * + * For robustness we resend Confirm options until the client has + * entered OPEN. During the initial feature negotiation, the MPS + * is smaller than usual, reduced by the Change/Confirm options. + */ + if (!list_empty(&dp->dccps_featneg) && len > cur_mps) { + DCCP_WARN("Payload too large (%d) for featneg.\n", len); + dccp_send_ack(sk); + dccp_feat_list_purge(&dp->dccps_featneg); + } + inet_csk_schedule_ack(sk); inet_csk_reset_xmit_timer(sk, ICSK_TIME_DACK, inet_csk(sk)->icsk_rto, |