Commit cfc62d87 authored Mar 21, 2017 by Gao Feng Committed by David S. Miller Mar 22, 2017

net: tcp: Permit user set TCP_MAXSEG to default value



When user_mss is zero, it means use the default value. But the current
codes don't permit user set TCP_MAXSEG to the default value.
It would return the -EINVAL when val is zero.

Signed-off-by: Gao Feng <fgao@ikuai8.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent b2a1674a

net/ipv4/tcp.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -2470,7 +2470,7 @@ static int do_tcp_setsockopt(struct sock *sk, int level,
		/* Values greater than interface MTU won't take effect. However
		* at the point when this call is done we typically don't yet
		* know which interface is going to be used */
		if (val < TCP_MIN_MSS \|\| val > MAX_TCP_WINDOW) {
		if (val && (val < TCP_MIN_MSS \|\| val > MAX_TCP_WINDOW)) {
		err = -EINVAL;
		break;
		}