Messages in this thread Patch in this message | | | From | Sasha Levin <> | Subject | [PATCH AUTOSEL 4.14 139/150] sock: Reset dst when changing sk_mark via setsockopt | Date | Sat, 16 Nov 2019 10:47:17 -0500 |
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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 7ccbcd853cbce..78c9aa310ce6b 100644 --- a/net/core/sock.c +++ b/net/core/sock.c @@ -985,10 +985,12 @@ 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: -- 2.20.1
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