Commit 15e56515 authored by Douglas Caetano dos Santos's avatar Douglas Caetano dos Santos Committed by David S. Miller

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: default avatarDouglas Caetano dos Santos <>
Signed-off-by: default avatarDavid S. Miller <>
parent b9565077
......@@ -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) {
tp->rx_opt.mss_clamp = opt.opt_val;
......@@ -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,
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