ipv4: Namespaceify tcp_retries1 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 eb4cd0a..dee6ba6 100644 (file)
--- a/include/net/netns/ipv4.h
+++ b/include/net/netns/ipv4.h
@@ -102,6 +102,7 @@ struct netns_ipv4 {
        int sysctl_tcp_synack_retries;
        int sysctl_tcp_syncookies;
        int sysctl_tcp_reordering;
+       int sysctl_tcp_retries1;
 
        struct ping_group_range ping_group_range;
 

diff --git a/include/net/tcp.h b/include/net/tcp.h
index 7e9a147..da96b9a 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_retries1;
 extern int sysctl_tcp_retries2;
 extern int sysctl_tcp_orphan_retries;
 extern int sysctl_tcp_fastopen;

diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index 7cd2057..52853c6 100644 (file)
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -319,14 +319,6 @@ static struct ctl_table ipv4_table[] = {
                .mode           = 0644,
                .proc_handler   = proc_dointvec
        },
-       {
-               .procname       = "tcp_retries1",
-               .data           = &sysctl_tcp_retries1,
-               .maxlen         = sizeof(int),
-               .mode           = 0644,
-               .proc_handler   = proc_dointvec_minmax,
-               .extra2         = &tcp_retr1_max
-       },
        {
                .procname       = "tcp_retries2",
                .data           = &sysctl_tcp_retries2,
@@ -960,6 +952,14 @@ static struct ctl_table ipv4_net_table[] = {
                .mode           = 0644,
                .proc_handler   = proc_dointvec
        },
+       {
+               .procname       = "tcp_retries1",
+               .data           = &init_net.ipv4.sysctl_tcp_retries1,
+               .maxlen         = sizeof(int),
+               .mode           = 0644,
+               .proc_handler   = proc_dointvec_minmax,
+               .extra2         = &tcp_retr1_max
+       },
        { }
 };
 

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 10dfc8b..57fe3c6 100644 (file)
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -2391,6 +2391,7 @@ static int __net_init tcp_sk_init(struct net *net)
        net->ipv4.sysctl_tcp_synack_retries = TCP_SYNACK_RETRIES;
        net->ipv4.sysctl_tcp_syncookies = 0;
        net->ipv4.sysctl_tcp_reordering = TCP_FASTRETRANS_THRESH;
+       net->ipv4.sysctl_tcp_retries1 = TCP_RETR1;
 
        return 0;
 fail:

diff --git a/net/ipv4/tcp_timer.c b/net/ipv4/tcp_timer.c
index ca25fdf..6694e33 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_retries1 __read_mostly = TCP_RETR1;
 int sysctl_tcp_retries2 __read_mostly = TCP_RETR2;
 int sysctl_tcp_orphan_retries __read_mostly;
 int sysctl_tcp_thin_linear_timeouts __read_mostly;
@@ -171,7 +170,7 @@ static int tcp_write_timeout(struct sock *sk)
                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)) {
+               if (retransmits_timed_out(sk, net->ipv4.sysctl_tcp_retries1, 0, 0)) {
                        /* Some middle-boxes may black-hole Fast Open _after_
                         * the handshake. Therefore we conservatively disable
                         * Fast Open on this path on recurring timeouts with
@@ -180,7 +179,7 @@ static int tcp_write_timeout(struct sock *sk)
                        if (tp->syn_data_acked &&
                            tp->bytes_acked <= tp->rx_opt.mss_clamp) {
                                tcp_fastopen_cache_set(sk, 0, NULL, true, 0);
-                               if (icsk->icsk_retransmits == sysctl_tcp_retries1)
+                               if (icsk->icsk_retransmits == net->ipv4.sysctl_tcp_retries1)
                                        NET_INC_STATS_BH(sock_net(sk),
                                                         LINUX_MIB_TCPFASTOPENACTIVEFAIL);
                        }
@@ -359,6 +358,7 @@ static void tcp_fastopen_synack_timer(struct sock *sk)
 void tcp_retransmit_timer(struct sock *sk)
 {
        struct tcp_sock *tp = tcp_sk(sk);
+       struct net *net = sock_net(sk);
        struct inet_connection_sock *icsk = inet_csk(sk);
 
        if (tp->fastopen_rsk) {
@@ -489,7 +489,7 @@ out_reset_timer:
                icsk->icsk_rto = min(icsk->icsk_rto << 1, TCP_RTO_MAX);
        }
        inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, icsk->icsk_rto, TCP_RTO_MAX);
-       if (retransmits_timed_out(sk, sysctl_tcp_retries1 + 1, 0, 0))
+       if (retransmits_timed_out(sk, net->ipv4.sysctl_tcp_retries1 + 1, 0, 0))
                __sk_dst_reset(sk);
 
 out:;