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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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2
include/net/tcp.h
View file

@ -529,8 +529,6 @@ int tcp_write_wakeup(struct sock *);
void tcp_send_fin(struct sock *sk); void tcp_send_fin(struct sock *sk);
void tcp_send_active_reset(struct sock *sk, gfp_t priority); void tcp_send_active_reset(struct sock *sk, gfp_t priority);
int tcp_send_synack(struct sock *); int tcp_send_synack(struct sock *);
bool tcp_syn_flood_action(struct sock *sk, const struct sk_buff *skb,
const char *proto);
void tcp_push_one(struct sock *, unsigned int mss_now); void tcp_push_one(struct sock *, unsigned int mss_now);
void tcp_send_ack(struct sock *sk); void tcp_send_ack(struct sock *sk);
void tcp_send_delayed_ack(struct sock *sk); void tcp_send_delayed_ack(struct sock *sk);

29
net/ipv4/tcp_input.c
View file

@ -5987,6 +5987,35 @@ struct request_sock *inet_reqsk_alloc(const struct request_sock_ops *ops,
} }
EXPORT_SYMBOL(inet_reqsk_alloc); EXPORT_SYMBOL(inet_reqsk_alloc);
/*
* Return true if a syncookie should be sent
*/
static 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;
}
int tcp_conn_request(struct request_sock_ops *rsk_ops, int tcp_conn_request(struct request_sock_ops *rsk_ops,
const struct tcp_request_sock_ops *af_ops, const struct tcp_request_sock_ops *af_ops,
struct sock *sk, struct sk_buff *skb) struct sock *sk, struct sk_buff *skb)

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); 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 #ifdef CONFIG_TCP_MD5SIG
/* /*