ipv4: Namespaceify tcp_retries2 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 dee6ba6..d92c8e5 100644 (file)
--- a/include/net/netns/ipv4.h
+++ b/include/net/netns/ipv4.h
@@ -103,6 +103,7 @@ struct netns_ipv4 {
        int sysctl_tcp_syncookies;
        int sysctl_tcp_reordering;
        int sysctl_tcp_retries1;
+       int sysctl_tcp_retries2;
 
        struct ping_group_range ping_group_range;
 

diff --git a/include/net/tcp.h b/include/net/tcp.h
index da96b9a..a786cfa 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_retries2;
 extern int sysctl_tcp_orphan_retries;
 extern int sysctl_tcp_fastopen;
 extern int sysctl_tcp_retrans_collapse;

diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index 52853c6..8e339d4 100644 (file)
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -319,13 +319,6 @@ static struct ctl_table ipv4_table[] = {
                .mode           = 0644,
                .proc_handler   = proc_dointvec
        },
-       {
-               .procname       = "tcp_retries2",
-               .data           = &sysctl_tcp_retries2,
-               .maxlen         = sizeof(int),
-               .mode           = 0644,
-               .proc_handler   = proc_dointvec
-       },
        {
                .procname       = "tcp_fin_timeout",
                .data           = &sysctl_tcp_fin_timeout,
@@ -960,6 +953,13 @@ static struct ctl_table ipv4_net_table[] = {
                .proc_handler   = proc_dointvec_minmax,
                .extra2         = &tcp_retr1_max
        },
+       {
+               .procname       = "tcp_retries2",
+               .data           = &init_net.ipv4.sysctl_tcp_retries2,
+               .maxlen         = sizeof(int),
+               .mode           = 0644,
+               .proc_handler   = proc_dointvec
+       },
        { }
 };
 

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 57fe3c6..0710e61 100644 (file)
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -2392,6 +2392,7 @@ static int __net_init tcp_sk_init(struct net *net)
        net->ipv4.sysctl_tcp_syncookies = 0;
        net->ipv4.sysctl_tcp_reordering = TCP_FASTRETRANS_THRESH;
        net->ipv4.sysctl_tcp_retries1 = TCP_RETR1;
+       net->ipv4.sysctl_tcp_retries2 = TCP_RETR2;
 
        return 0;
 fail:

diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index fda379c..7beb3f6 100644 (file)
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -3476,6 +3476,7 @@ void tcp_send_probe0(struct sock *sk)
 {
        struct inet_connection_sock *icsk = inet_csk(sk);
        struct tcp_sock *tp = tcp_sk(sk);
+       struct net *net = sock_net(sk);
        unsigned long probe_max;
        int err;
 
@@ -3489,7 +3490,7 @@ void tcp_send_probe0(struct sock *sk)
        }
 
        if (err <= 0) {
-               if (icsk->icsk_backoff < sysctl_tcp_retries2)
+               if (icsk->icsk_backoff < net->ipv4.sysctl_tcp_retries2)
                        icsk->icsk_backoff++;
                icsk->icsk_probes_out++;
                probe_max = TCP_RTO_MAX;

diff --git a/net/ipv4/tcp_timer.c b/net/ipv4/tcp_timer.c
index 6694e33..09f4e02 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_retries2 __read_mostly = TCP_RETR2;
 int sysctl_tcp_orphan_retries __read_mostly;
 int sysctl_tcp_thin_linear_timeouts __read_mostly;
 
@@ -189,7 +188,7 @@ static int tcp_write_timeout(struct sock *sk)
                        dst_negative_advice(sk);
                }
 
-               retry_until = sysctl_tcp_retries2;
+               retry_until = net->ipv4.sysctl_tcp_retries2;
                if (sock_flag(sk, SOCK_DEAD)) {
                        const bool alive = icsk->icsk_rto < TCP_RTO_MAX;
 
@@ -303,7 +302,7 @@ static void tcp_probe_timer(struct sock *sk)
                 (s32)(tcp_time_stamp - start_ts) > icsk->icsk_user_timeout)
                goto abort;
 
-       max_probes = sysctl_tcp_retries2;
+       max_probes = sock_net(sk)->ipv4.sysctl_tcp_retries2;
        if (sock_flag(sk, SOCK_DEAD)) {
                const bool alive = inet_csk_rto_backoff(icsk, TCP_RTO_MAX) < TCP_RTO_MAX;