ipv4: Namespaceify tcp_tw_recycle and tcp_max_tw_buckets knob

Different namespace application might require fast recycling
TIME-WAIT sockets independently of the host.

Signed-off-by: Haishuang Yan <yanhaishuang@cmss.chinamobile.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 8 insertions, 4 deletions

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index fe9da4fb96bf..56b5f49e3f97 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -146,6 +146,7 @@ int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
         struct rtable *rt;
         int err;
         struct ip_options_rcu *inet_opt;
+        struct inet_timewait_death_row *tcp_death_row = &sock_net(sk)->ipv4.tcp_death_row;
 
         if (addr_len < sizeof(struct sockaddr_in))
                 return -EINVAL;
@@ -196,7 +197,7 @@ int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
                         tp->write_seq      = 0;
         }
 
-        if (tcp_death_row.sysctl_tw_recycle &&
+        if (tcp_death_row->sysctl_tw_recycle &&
             !tp->rx_opt.ts_recent_stamp && fl4->daddr == daddr)
                 tcp_fetch_timewait_stamp(sk, &rt->dst);
 
@@ -215,7 +216,7 @@ int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
          * complete initialization after this.
          */
         tcp_set_state(sk, TCP_SYN_SENT);
-        err = inet_hash_connect(&tcp_death_row, sk);
+        err = inet_hash_connect(tcp_death_row, sk);
         if (err)
                 goto failure;
 
@@ -2457,6 +2458,10 @@ static int __net_init tcp_sk_init(struct net *net)
         net->ipv4.sysctl_tcp_notsent_lowat = UINT_MAX;
         net->ipv4.sysctl_tcp_tw_reuse = 0;
 
+        net->ipv4.tcp_death_row.sysctl_tw_recycle = 0;
+        net->ipv4.tcp_death_row.sysctl_max_tw_buckets = (tcp_hashinfo.ehash_mask + 1) / 2;
+        net->ipv4.tcp_death_row.hashinfo = &tcp_hashinfo;
+
         return 0;
 fail:
         tcp_sk_exit(net);
@@ -2466,7 +2471,7 @@ fail:
 
 static void __net_exit tcp_sk_exit_batch(struct list_head *net_exit_list)
 {
-        inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET);
+        inet_twsk_purge(&tcp_hashinfo, AF_INET);
 }
 
 static struct pernet_operations __net_initdata tcp_sk_ops = {
@@ -2477,7 +2482,6 @@ static struct pernet_operations __net_initdata tcp_sk_ops = {
 
 void __init tcp_v4_init(void)
 {
-        inet_hashinfo_init(&tcp_hashinfo);
         if (register_pernet_subsys(&tcp_sk_ops))
                 panic("Failed to create the TCP control socket.\n");
 }