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tcp: tcp_syn_flood_action() can be static

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After commit 1fb6f159fd ("tcp: add tcp_conn_request"),
tcp_syn_flood_action() is no longer used from IPv6.

We can make it static, by moving it above tcp_conn_request()

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Octavian Purdila <octavian.purdila@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2015-03-25 15:08:47 -07:00 • committed by David S. Miller
parent 1fb7cd4ef0
commit 41d25fe092
3 changed files with 29 additions and 31 deletions
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29
net/ipv4/tcp_ipv4.c
View file

@ -856,35 +856,6 @@ static void tcp_v4_reqsk_destructor(struct request_sock *req)
kfree(inet_rsk(req)->opt);
}
/*
* Return true if a syncookie should be sent
*/
bool tcp_syn_flood_action(struct sock *sk,
const struct sk_buff *skb,
const char *proto)
{
const char *msg = "Dropping request";
bool want_cookie = false;
struct listen_sock *lopt;
#ifdef CONFIG_SYN_COOKIES
if (sysctl_tcp_syncookies) {
msg = "Sending cookies";
want_cookie = true;
NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPREQQFULLDOCOOKIES);
} else
#endif
NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPREQQFULLDROP);
lopt = inet_csk(sk)->icsk_accept_queue.listen_opt;
if (!lopt->synflood_warned && sysctl_tcp_syncookies != 2) {
lopt->synflood_warned = 1;
pr_info("%s: Possible SYN flooding on port %d. %s. Check SNMP counters.\n",
proto, ntohs(tcp_hdr(skb)->dest), msg);
}
return want_cookie;
}
EXPORT_SYMBOL(tcp_syn_flood_action);
#ifdef CONFIG_TCP_MD5SIG
/*