From: David Barmann david.barmann@stackpath.com
[ Upstream commit 50254256f382c56bde87d970f3d0d02fdb76ec70 ]
When setting the SO_MARK socket option, if the mark changes, the dst needs to be reset so that a new route lookup is performed.
This fixes the case where an application wants to change routing by setting a new sk_mark. If this is done after some packets have already been sent, the dst is cached and has no effect.
Signed-off-by: David Barmann david.barmann@stackpath.com Reviewed-by: Eric Dumazet edumazet@google.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org --- net/core/sock.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/net/core/sock.c b/net/core/sock.c index ba4f843cdd1d1..948fd687292a6 100644 --- a/net/core/sock.c +++ b/net/core/sock.c @@ -951,10 +951,12 @@ int sock_setsockopt(struct socket *sock, int level, int optname, clear_bit(SOCK_PASSSEC, &sock->flags); break; case SO_MARK: - if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) + if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) { ret = -EPERM; - else + } else if (val != sk->sk_mark) { sk->sk_mark = val; + sk_dst_reset(sk); + } break;
case SO_RXQ_OVFL: