Message ID | 20130411114600.14cb8a5d5a5dee9e2f1306b5@highloadlab.com |
---|---|
State | Changes Requested, archived |
Delegated to: | David Miller |
Headers | show |
From: Dmitry Popov <dp@highloadlab.com> Date: Thu, 11 Apr 2013 11:46:00 +0400 > There is a bug in cookie_v4_check (net/ipv4/syncookies.c): > flowi4_init_output(&fl4, 0, sk->sk_mark, RT_CONN_FLAGS(sk), > RT_SCOPE_UNIVERSE, IPPROTO_TCP, > inet_sk_flowi_flags(sk), > (opt && opt->srr) ? opt->faddr : ireq->rmt_addr, > ireq->loc_addr, th->source, th->dest); > > Here we do not respect sk->sk_bound_dev_if, therefore wrong dst_entry may be > taken. This dst_entry is used by new socket (get_cookie_sock -> > tcp_v4_syn_recv_sock), so its packets may take the wrong path. > > Signed-off-by: Dmitry Popov <dp@highloadlab.com> Do not top post, especially with patches! Because you top posted the new version of the patch, my reply to you sits at the end of the new patch. Make a fresh, completely new, mailing list posting to post new versions of patches. Never do so using replies. Thanks. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/net/ipv4/syncookies.c b/net/ipv4/syncookies.c index ef54377..397e0f6 100644 --- a/net/ipv4/syncookies.c +++ b/net/ipv4/syncookies.c @@ -349,8 +349,8 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb, * hasn't changed since we received the original syn, but I see * no easy way to do this. */ - flowi4_init_output(&fl4, 0, sk->sk_mark, RT_CONN_FLAGS(sk), - RT_SCOPE_UNIVERSE, IPPROTO_TCP, + flowi4_init_output(&fl4, sk->sk_bound_dev_if, sk->sk_mark, + RT_CONN_FLAGS(sk), RT_SCOPE_UNIVERSE, IPPROTO_TCP, inet_sk_flowi_flags(sk), (opt && opt->srr) ? opt->faddr : ireq->rmt_addr, ireq->loc_addr, th->source, th->dest);