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| author | Dmitry Popov <dp@highloadlab.com> | 2013-04-11 08:55:07 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-04-11 16:01:46 -0400 |
| commit | d66954a066158781ccf9c13c91d0316970fe57b6 (patch) | |
| tree | 72a493b500858f3ea89949e21a7d9997d90d1838 /net/ipv4/syncookies.c | |
| parent | fe2971a01762963c62e9872bfcf0632546342c0f (diff) | |
| download | linux-stable-d66954a066158781ccf9c13c91d0316970fe57b6.tar.gz linux-stable-d66954a066158781ccf9c13c91d0316970fe57b6.tar.bz2 linux-stable-d66954a066158781ccf9c13c91d0316970fe57b6.zip | |
tcp: incoming connections might use wrong route under synflood
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>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/syncookies.c')
| -rw-r--r-- | net/ipv4/syncookies.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/ipv4/syncookies.c b/net/ipv4/syncookies.c index ef54377fb11c..397e0f69435f 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); |