tcp: tcp_syn_flood_action() can be static

After commit 1fb6f159fd21 ("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>

1 files changed, 0 insertions, 29 deletions

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index e073517b2cc7..5aababa20a21 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -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
 /*