tcp: move synflood_warned into struct request_sock_queue

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>

diff --git a/include/net/request_sock.h b/include/net/request_sock.h
index d128e7f..273fb72 100644 (file)
--- a/include/net/request_sock.h
+++ b/include/net/request_sock.h
@@ -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;

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index e58cbcd..8b0ce73 100644 (file)
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -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);