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| author | Christoph Paasch <cpaasch@apple.com> | 2017-12-11 00:05:46 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-12-12 11:15:42 -0500 |
| commit | 30791ac41927ebd3e75486f9504b6d2280463bf0 (patch) | |
| tree | 7d1bc27f38566a3ac0e7bd7a32fa6b998a9440a2 /net/ipv6/tcp_ipv6.c | |
| parent | 200809716aed1cac586fcac4c0551a688439be1f (diff) | |
| download | linux-30791ac41927ebd3e75486f9504b6d2280463bf0.tar.gz linux-30791ac41927ebd3e75486f9504b6d2280463bf0.tar.bz2 linux-30791ac41927ebd3e75486f9504b6d2280463bf0.zip | |
tcp md5sig: Use skb's saddr when replying to an incoming segment
The MD5-key that belongs to a connection is identified by the peer's
IP-address. When we are in tcp_v4(6)_reqsk_send_ack(), we are replying
to an incoming segment from tcp_check_req() that failed the seq-number
checks.
Thus, to find the correct key, we need to use the skb's saddr and not
the daddr.
This bug seems to have been there since quite a while, but probably got
unnoticed because the consequences are not catastrophic. We will call
tcp_v4_reqsk_send_ack only to send a challenge-ACK back to the peer,
thus the connection doesn't really fail.
Fixes: 9501f9722922 ("tcp md5sig: Let the caller pass appropriate key for tcp_v{4,6}_do_calc_md5_hash().")
Signed-off-by: Christoph Paasch <cpaasch@apple.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/tcp_ipv6.c')
| -rw-r--r-- | net/ipv6/tcp_ipv6.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c index 1f04ec0e4a7a..7178476b3d2f 100644 --- a/net/ipv6/tcp_ipv6.c +++ b/net/ipv6/tcp_ipv6.c @@ -994,7 +994,7 @@ static void tcp_v6_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb, req->rsk_rcv_wnd >> inet_rsk(req)->rcv_wscale, tcp_time_stamp_raw() + tcp_rsk(req)->ts_off, req->ts_recent, sk->sk_bound_dev_if, - tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr), + tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->saddr), 0, 0); } |