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ipv4: tcp: dont cache output dst for syncookies

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Don't cache output dst for syncookies, as this adds pressure on IP route
cache and rcu subsystem for no gain.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Hans Schillstrom <hans.schillstrom@ericsson.com>
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
2012-06-20 05:02:19 +00:00
committed by David S. Miller
parent 24ea818e30
commit 7586eceb0a
6 changed files with 21 additions and 10 deletions
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net/ipv4/inet_connection_sock.c
+6 -2
View File
@@ -368,17 +368,21 @@ EXPORT_SYMBOL(inet_csk_reset_keepalive_timer);
struct dst_entry *inet_csk_route_req(struct sock *sk,
struct flowi4 *fl4,
const struct request_sock *req)
const struct request_sock *req,
bool nocache)
{
struct rtable *rt;
const struct inet_request_sock *ireq = inet_rsk(req);
struct ip_options_rcu *opt = inet_rsk(req)->opt;
struct net *net = sock_net(sk);
int flags = inet_sk_flowi_flags(sk) & ~FLOWI_FLAG_PRECOW_METRICS;
if (nocache)
flags |= FLOWI_FLAG_RT_NOCACHE;
flowi4_init_output(fl4, sk->sk_bound_dev_if, sk->sk_mark,
RT_CONN_FLAGS(sk), RT_SCOPE_UNIVERSE,
sk->sk_protocol,
inet_sk_flowi_flags(sk) & ~FLOWI_FLAG_PRECOW_METRICS,
flags,
(opt && opt->opt.srr) ? opt->opt.faddr : ireq->rmt_addr,
ireq->loc_addr, ireq->rmt_port, inet_sk(sk)->inet_sport);
security_req_classify_flow(req, flowi4_to_flowi(fl4));