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ipv4: tcp: dont cache output dst for syncookies 

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/net/flow.h
View File

@ -22,6 +22,7 @@ struct flowi_common {
#define FLOWI_FLAG_ANYSRC 0x01
#define FLOWI_FLAG_PRECOW_METRICS 0x02
#define FLOWI_FLAG_CAN_SLEEP 0x04
#define FLOWI_FLAG_RT_NOCACHE 0x08
__u32 flowic_secid;
};

3
include/net/inet_connection_sock.h
View File

@ -251,7 +251,8 @@ extern int inet_csk_get_port(struct sock *sk, unsigned short snum);
extern 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);
extern struct dst_entry* inet_csk_route_child_sock(struct sock *sk,
struct sock *newsk,
const struct request_sock *req);

2
net/dccp/ipv4.c
View File

@ -504,7 +504,7 @@ static int dccp_v4_send_response(struct sock *sk, struct request_sock *req,
struct dst_entry *dst;
struct flowi4 fl4;
dst = inet_csk_route_req(sk, &fl4, req);
dst = inet_csk_route_req(sk, &fl4, req, false);
if (dst == NULL)
goto out;

8
net/ipv4/inet_connection_sock.c
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));

5
net/ipv4/route.c
View File

@ -1156,7 +1156,7 @@ restart:
candp = NULL;
now = jiffies;
if (!rt_caching(dev_net(rt->dst.dev))) {
if (!rt_caching(dev_net(rt->dst.dev)) || (rt->dst.flags & DST_NOCACHE)) {
/*
* If we're not caching, just tell the caller we
* were successful and don't touch the route. The
@ -2582,6 +2582,9 @@ static struct rtable *__mkroute_output(const struct fib_result *res,
rt_set_nexthop(rth, fl4, res, fi, type, 0);
if (fl4->flowi4_flags & FLOWI_FLAG_RT_NOCACHE)
rth->dst.flags |= DST_NOCACHE;
return rth;
}

12
net/ipv4/tcp_ipv4.c
View File

@ -825,7 +825,8 @@ static void tcp_v4_reqsk_send_ack(struct sock *sk, struct sk_buff *skb,
static int tcp_v4_send_synack(struct sock *sk, struct dst_entry *dst,
struct request_sock *req,
struct request_values *rvp,
u16 queue_mapping)
u16 queue_mapping,
bool nocache)
{
const struct inet_request_sock *ireq = inet_rsk(req);
struct flowi4 fl4;
@ -833,7 +834,7 @@ static int tcp_v4_send_synack(struct sock *sk, struct dst_entry *dst,
struct sk_buff * skb;
/* First, grab a route. */
if (!dst && (dst = inet_csk_route_req(sk, &fl4, req)) == NULL)
if (!dst && (dst = inet_csk_route_req(sk, &fl4, req, nocache)) == NULL)
return -1;
skb = tcp_make_synack(sk, dst, req, rvp);
@ -855,7 +856,7 @@ static int tcp_v4_rtx_synack(struct sock *sk, struct request_sock *req,
struct request_values *rvp)
{
TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_RETRANSSEGS);
return tcp_v4_send_synack(sk, NULL, req, rvp, 0);
return tcp_v4_send_synack(sk, NULL, req, rvp, 0, false);
}
/*
@ -1388,7 +1389,7 @@ int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
*/
if (tmp_opt.saw_tstamp &&
tcp_death_row.sysctl_tw_recycle &&
(dst = inet_csk_route_req(sk, &fl4, req)) != NULL &&
(dst = inet_csk_route_req(sk, &fl4, req, want_cookie)) != NULL &&
fl4.daddr == saddr &&
(peer = rt_get_peer((struct rtable *)dst, fl4.daddr)) != NULL) {
inet_peer_refcheck(peer);
@ -1424,7 +1425,8 @@ int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
if (tcp_v4_send_synack(sk, dst, req,
(struct request_values *)&tmp_ext,
skb_get_queue_mapping(skb)) ||
skb_get_queue_mapping(skb),
want_cookie) ||
want_cookie)
goto drop_and_free;