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>
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@ -22,6 +22,7 @@ struct flowi_common {
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#define FLOWI_FLAG_ANYSRC 0x01
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#define FLOWI_FLAG_PRECOW_METRICS 0x02
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#define FLOWI_FLAG_CAN_SLEEP 0x04
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#define FLOWI_FLAG_RT_NOCACHE 0x08
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__u32 flowic_secid;
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};
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@ -251,7 +251,8 @@ extern int inet_csk_get_port(struct sock *sk, unsigned short snum);
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extern struct dst_entry* inet_csk_route_req(struct sock *sk,
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struct flowi4 *fl4,
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const struct request_sock *req);
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const struct request_sock *req,
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bool nocache);
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extern struct dst_entry* inet_csk_route_child_sock(struct sock *sk,
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struct sock *newsk,
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const struct request_sock *req);
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@ -504,7 +504,7 @@ static int dccp_v4_send_response(struct sock *sk, struct request_sock *req,
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struct dst_entry *dst;
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struct flowi4 fl4;
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dst = inet_csk_route_req(sk, &fl4, req);
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dst = inet_csk_route_req(sk, &fl4, req, false);
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if (dst == NULL)
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goto out;
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@ -368,17 +368,21 @@ EXPORT_SYMBOL(inet_csk_reset_keepalive_timer);
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struct dst_entry *inet_csk_route_req(struct sock *sk,
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struct flowi4 *fl4,
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const struct request_sock *req)
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const struct request_sock *req,
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bool nocache)
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{
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struct rtable *rt;
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const struct inet_request_sock *ireq = inet_rsk(req);
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struct ip_options_rcu *opt = inet_rsk(req)->opt;
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struct net *net = sock_net(sk);
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int flags = inet_sk_flowi_flags(sk) & ~FLOWI_FLAG_PRECOW_METRICS;
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if (nocache)
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flags |= FLOWI_FLAG_RT_NOCACHE;
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flowi4_init_output(fl4, sk->sk_bound_dev_if, sk->sk_mark,
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RT_CONN_FLAGS(sk), RT_SCOPE_UNIVERSE,
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sk->sk_protocol,
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inet_sk_flowi_flags(sk) & ~FLOWI_FLAG_PRECOW_METRICS,
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flags,
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(opt && opt->opt.srr) ? opt->opt.faddr : ireq->rmt_addr,
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ireq->loc_addr, ireq->rmt_port, inet_sk(sk)->inet_sport);
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security_req_classify_flow(req, flowi4_to_flowi(fl4));
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@ -1156,7 +1156,7 @@ restart:
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candp = NULL;
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now = jiffies;
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if (!rt_caching(dev_net(rt->dst.dev))) {
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if (!rt_caching(dev_net(rt->dst.dev)) || (rt->dst.flags & DST_NOCACHE)) {
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/*
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* If we're not caching, just tell the caller we
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* were successful and don't touch the route. The
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@ -2582,6 +2582,9 @@ static struct rtable *__mkroute_output(const struct fib_result *res,
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rt_set_nexthop(rth, fl4, res, fi, type, 0);
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if (fl4->flowi4_flags & FLOWI_FLAG_RT_NOCACHE)
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rth->dst.flags |= DST_NOCACHE;
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return rth;
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}
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@ -825,7 +825,8 @@ static void tcp_v4_reqsk_send_ack(struct sock *sk, struct sk_buff *skb,
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static int tcp_v4_send_synack(struct sock *sk, struct dst_entry *dst,
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struct request_sock *req,
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struct request_values *rvp,
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u16 queue_mapping)
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u16 queue_mapping,
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bool nocache)
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{
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const struct inet_request_sock *ireq = inet_rsk(req);
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struct flowi4 fl4;
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@ -833,7 +834,7 @@ static int tcp_v4_send_synack(struct sock *sk, struct dst_entry *dst,
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struct sk_buff * skb;
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/* First, grab a route. */
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if (!dst && (dst = inet_csk_route_req(sk, &fl4, req)) == NULL)
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if (!dst && (dst = inet_csk_route_req(sk, &fl4, req, nocache)) == NULL)
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return -1;
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skb = tcp_make_synack(sk, dst, req, rvp);
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@ -855,7 +856,7 @@ static int tcp_v4_rtx_synack(struct sock *sk, struct request_sock *req,
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struct request_values *rvp)
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{
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TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_RETRANSSEGS);
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return tcp_v4_send_synack(sk, NULL, req, rvp, 0);
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return tcp_v4_send_synack(sk, NULL, req, rvp, 0, false);
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}
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/*
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@ -1388,7 +1389,7 @@ int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
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*/
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if (tmp_opt.saw_tstamp &&
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tcp_death_row.sysctl_tw_recycle &&
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(dst = inet_csk_route_req(sk, &fl4, req)) != NULL &&
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(dst = inet_csk_route_req(sk, &fl4, req, want_cookie)) != NULL &&
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fl4.daddr == saddr &&
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(peer = rt_get_peer((struct rtable *)dst, fl4.daddr)) != NULL) {
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inet_peer_refcheck(peer);
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@ -1424,7 +1425,8 @@ int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
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if (tcp_v4_send_synack(sk, dst, req,
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(struct request_values *)&tmp_ext,
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skb_get_queue_mapping(skb)) ||
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skb_get_queue_mapping(skb),
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want_cookie) ||
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want_cookie)
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goto drop_and_free;
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