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-rw-r--r--net/dccp/output.c15
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,