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tcp: reinitialize MTU probing when setting MSS in a TCP repair 

MTU probing initialization occurred only at connect() and at SYN or
SYN-ACK reception, but the former sets MSS to either the default or the
user set value (through TCP_MAXSEG sockopt) and the latter never happens
with repaired sockets.

The result was that, with MTU probing enabled and unless TCP_MAXSEG
sockopt was used before connect(), probing would be stuck at
tcp_base_mss value until tcp_probe_interval seconds have passed.

Signed-off-by: Douglas Caetano dos Santos <douglascs@taghos.com.br>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Douglas Caetano dos Santos 2017-05-26 14:28:00 -03:00 committed by David S. Miller
parent b9565077ae
commit 15e5651525
1 changed files with 4 additions and 2 deletions
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6
net/ipv4/tcp.c
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@ -2381,9 +2381,10 @@ static int tcp_repair_set_window(struct tcp_sock *tp, char __user *optbuf, int l
return 0;
}
static int tcp_repair_options_est(struct tcp_sock *tp,
static int tcp_repair_options_est(struct sock *sk,
struct tcp_repair_opt __user *optbuf, unsigned int len)
{
struct tcp_sock *tp = tcp_sk(sk);
struct tcp_repair_opt opt;
while (len >= sizeof(opt)) {
@ -2396,6 +2397,7 @@ static int tcp_repair_options_est(struct tcp_sock *tp,
switch (opt.opt_code) {
case TCPOPT_MSS:
tp->rx_opt.mss_clamp = opt.opt_val;
tcp_mtup_init(sk);
break;
case TCPOPT_WINDOW:
{
@ -2555,7 +2557,7 @@ static int do_tcp_setsockopt(struct sock *sk, int level,
if (!tp->repair)
err = -EINVAL;
else if (sk->sk_state == TCP_ESTABLISHED)
err = tcp_repair_options_est(tp,
err = tcp_repair_options_est(sk,
(struct tcp_repair_opt __user *)optval,
optlen);
else