ipv4: Namespaceify tcp syn retries sysctl knob

Signed-off-by: Nikolay Borisov <kernel@kyup.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/netns/ipv4.h b/include/net/netns/ipv4.h
index 2b7907a..b7b5bd6 100644 (file)
--- a/include/net/netns/ipv4.h
+++ b/include/net/netns/ipv4.h
@@ -98,6 +98,8 @@ struct netns_ipv4 {
        int sysctl_tcp_keepalive_probes;
        int sysctl_tcp_keepalive_intvl;
 
+       int sysctl_tcp_syn_retries;
+
        struct ping_group_range ping_group_range;
 
        atomic_t dev_addr_genid;

diff --git a/include/net/tcp.h b/include/net/tcp.h
index 479d535..825485c 100644 (file)
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -240,7 +240,6 @@ extern int sysctl_tcp_timestamps;
 extern int sysctl_tcp_window_scaling;
 extern int sysctl_tcp_sack;
 extern int sysctl_tcp_fin_timeout;
-extern int sysctl_tcp_syn_retries;
 extern int sysctl_tcp_synack_retries;
 extern int sysctl_tcp_retries1;
 extern int sysctl_tcp_retries2;

diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index 4d367b4..ae9dd88 100644 (file)
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -291,15 +291,6 @@ static struct ctl_table ipv4_table[] = {
                .extra1         = &ip_ttl_min,
                .extra2         = &ip_ttl_max,
        },
-       {
-               .procname       = "tcp_syn_retries",
-               .data           = &sysctl_tcp_syn_retries,
-               .maxlen         = sizeof(int),
-               .mode           = 0644,
-               .proc_handler   = proc_dointvec_minmax,
-               .extra1         = &tcp_syn_retries_min,
-               .extra2         = &tcp_syn_retries_max
-       },
        {
                .procname       = "tcp_synack_retries",
                .data           = &sysctl_tcp_synack_retries,
@@ -960,6 +951,15 @@ static struct ctl_table ipv4_net_table[] = {
                .mode           = 0644,
                .proc_handler   = proc_dointvec_jiffies,
        },
+       {
+               .procname       = "tcp_syn_retries",
+               .data           = &init_net.ipv4.sysctl_tcp_syn_retries,
+               .maxlen         = sizeof(int),
+               .mode           = 0644,
+               .proc_handler   = proc_dointvec_minmax,
+               .extra1         = &tcp_syn_retries_min,
+               .extra2         = &tcp_syn_retries_max
+       },
        { }
 };
 

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index c507577..3dbb363 100644 (file)
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -2731,6 +2731,7 @@ static int do_tcp_getsockopt(struct sock *sk, int level,
 {
        struct inet_connection_sock *icsk = inet_csk(sk);
        struct tcp_sock *tp = tcp_sk(sk);
+       struct net *net = sock_net(sk);
        int val, len;
 
        if (get_user(len, optlen))
@@ -2765,7 +2766,7 @@ static int do_tcp_getsockopt(struct sock *sk, int level,
                val = keepalive_probes(tp);
                break;
        case TCP_SYNCNT:
-               val = icsk->icsk_syn_retries ? : sysctl_tcp_syn_retries;
+               val = icsk->icsk_syn_retries ? : net->ipv4.sysctl_tcp_syn_retries;
                break;
        case TCP_LINGER2:
                val = tp->linger2;

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index a4d5237..f746485 100644 (file)
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -2388,6 +2388,8 @@ static int __net_init tcp_sk_init(struct net *net)
        net->ipv4.sysctl_tcp_keepalive_probes = TCP_KEEPALIVE_PROBES;
        net->ipv4.sysctl_tcp_keepalive_intvl = TCP_KEEPALIVE_INTVL;
 
+       net->ipv4.sysctl_tcp_syn_retries = TCP_SYN_RETRIES;
+
        return 0;
 fail:
        tcp_sk_exit(net);

diff --git a/net/ipv4/tcp_timer.c b/net/ipv4/tcp_timer.c
index a4730a2..c5d51f5 100644 (file)
--- a/net/ipv4/tcp_timer.c
+++ b/net/ipv4/tcp_timer.c
@@ -22,7 +22,6 @@
 #include <linux/gfp.h>
 #include <net/tcp.h>
 
-int sysctl_tcp_syn_retries __read_mostly = TCP_SYN_RETRIES;
 int sysctl_tcp_synack_retries __read_mostly = TCP_SYNACK_RETRIES;
 int sysctl_tcp_retries1 __read_mostly = TCP_RETR1;
 int sysctl_tcp_retries2 __read_mostly = TCP_RETR2;
@@ -157,6 +156,7 @@ static int tcp_write_timeout(struct sock *sk)
 {
        struct inet_connection_sock *icsk = inet_csk(sk);
        struct tcp_sock *tp = tcp_sk(sk);
+       struct net *net = sock_net(sk);
        int retry_until;
        bool do_reset, syn_set = false;
 
@@ -169,7 +169,7 @@ static int tcp_write_timeout(struct sock *sk)
                                NET_INC_STATS_BH(sock_net(sk),
                                                 LINUX_MIB_TCPFASTOPENACTIVEFAIL);
                }
-               retry_until = icsk->icsk_syn_retries ? : sysctl_tcp_syn_retries;
+               retry_until = icsk->icsk_syn_retries ? : net->ipv4.sysctl_tcp_syn_retries;
                syn_set = true;
        } else {
                if (retransmits_timed_out(sk, sysctl_tcp_retries1, 0, 0)) {