diff options
| -rw-r--r-- | net/ipv4/tcp_input.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 48ee476aa031..c7e16b0ed791 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -2689,7 +2689,22 @@ void tcp_simple_retransmit(struct sock *sk) const struct inet_connection_sock *icsk = inet_csk(sk); struct tcp_sock *tp = tcp_sk(sk); struct sk_buff *skb; - unsigned int mss = tcp_current_mss(sk); + int mss; + + /* A fastopen SYN request is stored as two separate packets within + * the retransmit queue, this is done by tcp_send_syn_data(). + * As a result simply checking the MSS of the frames in the queue + * will not work for the SYN packet. + * + * Us being here is an indication of a path MTU issue so we can + * assume that the fastopen SYN was lost and just mark all the + * frames in the retransmit queue as lost. We will use an MSS of + * -1 to mark all frames as lost, otherwise compute the current MSS. + */ + if (tp->syn_data && sk->sk_state == TCP_SYN_SENT) + mss = -1; + else + mss = tcp_current_mss(sk); skb_rbtree_walk(skb, &sk->tcp_rtx_queue) { if (tcp_skb_seglen(skb) > mss) |