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tcp: move synflood_warned into struct request_sock_queue

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long term plan is to remove struct listen_sock when its hash
table is no longer there.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2015-10-02 11:43:25 -07:00 committed by David S. Miller
parent aac065c50a
commit 8d2675f1e4
2 changed files with 4 additions and 5 deletions
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2
include/net/request_sock.h
View File

@ -123,7 +123,6 @@ extern int sysctl_max_syn_backlog;
*/
struct listen_sock {
u32 max_qlen_log;
u32 synflood_warned;
u32 hash_rnd;
u32 nr_table_entries;
struct request_sock *syn_table[0];
@ -171,6 +170,7 @@ struct fastopen_queue {
struct request_sock_queue {
spinlock_t rskq_lock;
u8 rskq_defer_accept;
u32 synflood_warned;
atomic_t qlen;
atomic_t young;

7
net/ipv4/tcp_input.c
View File

@ -6068,9 +6068,9 @@ static bool tcp_syn_flood_action(const struct sock *sk,
const struct sk_buff *skb,
const char *proto)
{
struct request_sock_queue *queue = &inet_csk(sk)->icsk_accept_queue;
const char *msg = "Dropping request";
bool want_cookie = false;
struct listen_sock *lopt;
#ifdef CONFIG_SYN_COOKIES
if (sysctl_tcp_syncookies) {
@ -6081,10 +6081,9 @@ static bool tcp_syn_flood_action(const struct sock *sk,
#endif
NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPREQQFULLDROP);
lopt = inet_csk(sk)->icsk_accept_queue.listen_opt;
if (!lopt->synflood_warned &&
if (!queue->synflood_warned &&
sysctl_tcp_syncookies != 2 &&
xchg(&lopt->synflood_warned, 1) == 0)
xchg(&queue->synflood_warned, 1) == 0)
pr_info("%s: Possible SYN flooding on port %d. %s. Check SNMP counters.\n",
proto, ntohs(tcp_hdr(skb)->dest), msg);