diff options
| author | Eric Dumazet <edumazet@google.com> | 2012-05-04 09:14:02 +0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-05-04 20:05:27 +0400 |
| commit | bd14b1b2e29bd6812597f896dde06eaf7c6d2f24 (patch) | |
| tree | bd641279d50993e32da8f8d72672bce4e54820bd /net/ipv4/tcp_ipv4.c | |
| parent | f45ebf3a6be9da051f078b30e7309b6788932189 (diff) | |
| download | linux-bd14b1b2e29bd6812597f896dde06eaf7c6d2f24.tar.xz | |
tcp: be more strict before accepting ECN negociation
It appears some networks play bad games with the two bits reserved for
ECN. This can trigger false congestion notifications and very slow
transferts.
Since RFC 3168 (6.1.1) forbids SYN packets to carry CT bits, we can
disable TCP ECN negociation if it happens we receive mangled CT bits in
the SYN packet.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Perry Lorier <perryl@google.com>
Cc: Matt Mathis <mattmathis@google.com>
Cc: Yuchung Cheng <ycheng@google.com>
Cc: Neal Cardwell <ncardwell@google.com>
Cc: Wilmer van der Gaast <wilmer@google.com>
Cc: Ankur Jain <jankur@google.com>
Cc: Tom Herbert <therbert@google.com>
Cc: Dave Täht <dave.taht@bufferbloat.net>
Acked-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_ipv4.c')
| -rw-r--r-- | net/ipv4/tcp_ipv4.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index cf97e9821d76..4ff5e1f70d16 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -1368,7 +1368,7 @@ int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb) goto drop_and_free; if (!want_cookie || tmp_opt.tstamp_ok) - TCP_ECN_create_request(req, tcp_hdr(skb)); + TCP_ECN_create_request(req, skb); if (want_cookie) { isn = cookie_v4_init_sequence(sk, skb, &req->mss); |