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tcp: be more strict before accepting ECN negociation

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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>
This commit is contained in:
Eric Dumazet 2012-05-04 05:14:02 +00:00 committed by David S. Miller
parent f45ebf3a6b
commit bd14b1b2e2
3 changed files with 18 additions and 9 deletions
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23
include/net/tcp.h
View file

@ -367,13 +367,6 @@ static inline void tcp_dec_quickack_mode(struct sock *sk,
#define TCP_ECN_DEMAND_CWR 4
#define TCP_ECN_SEEN 8
static __inline__ void
TCP_ECN_create_request(struct request_sock *req, struct tcphdr *th)
{
if (sysctl_tcp_ecn && th->ece && th->cwr)
inet_rsk(req)->ecn_ok = 1;
}
enum tcp_tw_status {
TCP_TW_SUCCESS = 0,
TCP_TW_RST = 1,
@ -671,6 +664,22 @@ struct tcp_skb_cb {
#define TCP_SKB_CB(__skb) ((struct tcp_skb_cb *)&((__skb)->cb[0]))
/* RFC3168 : 6.1.1 SYN packets must not have ECT/ECN bits set
*
* If we receive a SYN packet with these bits set, it means a network is
* playing bad games with TOS bits. In order to avoid possible false congestion
* notifications, we disable TCP ECN negociation.
*/
static inline void
TCP_ECN_create_request(struct request_sock *req, const struct sk_buff *skb)
{
const struct tcphdr *th = tcp_hdr(skb);
if (sysctl_tcp_ecn && th->ece && th->cwr &&
INET_ECN_is_not_ect(TCP_SKB_CB(skb)->ip_dsfield))
inet_rsk(req)->ecn_ok = 1;
}
/* Due to TSO, an SKB can be composed of multiple actual
* packets. To keep these tracked properly, we use this.
*/

2
net/ipv4/tcp_ipv4.c
View file

@ -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);

2
net/ipv6/tcp_ipv6.c
View file

@ -1140,7 +1140,7 @@ static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
treq->rmt_addr = ipv6_hdr(skb)->saddr;
treq->loc_addr = ipv6_hdr(skb)->daddr;
if (!want_cookie || tmp_opt.tstamp_ok)
TCP_ECN_create_request(req, tcp_hdr(skb));
TCP_ECN_create_request(req, skb);
treq->iif = sk->sk_bound_dev_if;