tcp: Namespaceify sysctl_tcp_window_scaling

Signed-off-by: Eric Dumazet <edumazet@google.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 bb02482ec8215d59943a708fce0f720e0a71aa8f..1a2ae74a108510a49466a08fd2c2d84c3940a3a9 100644 (file)
--- a/include/net/netns/ipv4.h
+++ b/include/net/netns/ipv4.h
@@ -123,6 +123,7 @@ struct netns_ipv4 {
        unsigned int sysctl_tcp_notsent_lowat;
        int sysctl_tcp_tw_reuse;
        int sysctl_tcp_sack;
+       int sysctl_tcp_window_scaling;
        struct inet_timewait_death_row tcp_death_row;
        int sysctl_max_syn_backlog;
 

diff --git a/include/net/tcp.h b/include/net/tcp.h
index f9d2ce0ba6769d3b95da8846344c0ba1811a55a8..f41ed5bac49312e2bd9b7bfd54b59a95d9888ec9 100644 (file)
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -238,7 +238,6 @@ void tcp_time_wait(struct sock *sk, int state, int timeo);
 
 /* sysctl variables for tcp */
 extern int sysctl_tcp_timestamps;
-extern int sysctl_tcp_window_scaling;
 extern int sysctl_tcp_fastopen;
 extern int sysctl_tcp_retrans_collapse;
 extern int sysctl_tcp_stdurg;

diff --git a/net/ipv4/syncookies.c b/net/ipv4/syncookies.c
index b386e8592ffddf2c3565486b6897cb9a4dc2dcb1..3d74a45773f1f7adf430885fe46096a498b4e489 100644 (file)
--- a/net/ipv4/syncookies.c
+++ b/net/ipv4/syncookies.c
@@ -257,7 +257,7 @@ bool cookie_timestamp_decode(const struct net *net,
        tcp_opt->wscale_ok = 1;
        tcp_opt->snd_wscale = options & TS_OPT_WSCALE_MASK;
 
-       return sysctl_tcp_window_scaling != 0;
+       return net->ipv4.sysctl_tcp_window_scaling != 0;
 }
 EXPORT_SYMBOL(cookie_timestamp_decode);
 

diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index 74718f8a0aa8fd8ff52cb50112bb0f5101125b6a..c30ac2ba0e140698d310b4d84e1bbd8f37e650a5 100644 (file)
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -371,13 +371,6 @@ static struct ctl_table ipv4_table[] = {
                .mode           = 0644,
                .proc_handler   = proc_dointvec
        },
-       {
-               .procname       = "tcp_window_scaling",
-               .data           = &sysctl_tcp_window_scaling,
-               .maxlen         = sizeof(int),
-               .mode           = 0644,
-               .proc_handler   = proc_dointvec
-       },
        {
                .procname       = "tcp_retrans_collapse",
                .data           = &sysctl_tcp_retrans_collapse,
@@ -1116,6 +1109,13 @@ static struct ctl_table ipv4_net_table[] = {
                .mode           = 0644,
                .proc_handler   = proc_dointvec
        },
+       {
+               .procname       = "tcp_window_scaling",
+               .data           = &init_net.ipv4.sysctl_tcp_window_scaling,
+               .maxlen         = sizeof(int),
+               .mode           = 0644,
+               .proc_handler   = proc_dointvec
+       },
        { }
 };
 

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 2eacfcaf1257b9f474ae5af8169eec4b4d30f3f3..675ee903370ffd983109a2651235d627cad6eaa5 100644 (file)
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -77,7 +77,6 @@
 #include <linux/errqueue.h>
 
 int sysctl_tcp_timestamps __read_mostly = 1;
-int sysctl_tcp_window_scaling __read_mostly = 1;
 int sysctl_tcp_fack __read_mostly;
 int sysctl_tcp_max_reordering __read_mostly = 300;
 int sysctl_tcp_dsack __read_mostly = 1;
@@ -3765,7 +3764,7 @@ void tcp_parse_options(const struct net *net,
                                break;
                        case TCPOPT_WINDOW:
                                if (opsize == TCPOLEN_WINDOW && th->syn &&
-                                   !estab && sysctl_tcp_window_scaling) {
+                                   !estab && net->ipv4.sysctl_tcp_window_scaling) {
                                        __u8 snd_wscale = *(__u8 *)ptr;
                                        opt_rx->wscale_ok = 1;
                                        if (snd_wscale > TCP_MAX_WSCALE) {

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 3c475a2a84323c8064d271b7dc2d0e1d68dd7e2e..e07ef5b14aaf4bd46253775b649cd77b58af5a2f 100644 (file)
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -2466,6 +2466,7 @@ static int __net_init tcp_sk_init(struct net *net)
 
        net->ipv4.sysctl_max_syn_backlog = max(128, cnt / 256);
        net->ipv4.sysctl_tcp_sack = 1;
+       net->ipv4.sysctl_tcp_window_scaling = 1;
 
        return 0;
 fail:

diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 45c8e459db49bcbf3ca17b5f048cee82c3273ef7..3f40950107857b2984e858bf6d9e48e6f87a3259 100644 (file)
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -575,7 +575,7 @@ static unsigned int tcp_syn_options(struct sock *sk, struct sk_buff *skb,
                opts->tsecr = tp->rx_opt.ts_recent;
                remaining -= TCPOLEN_TSTAMP_ALIGNED;
        }
-       if (likely(sysctl_tcp_window_scaling)) {
+       if (likely(sock_net(sk)->ipv4.sysctl_tcp_window_scaling)) {
                opts->ws = tp->rx_opt.rcv_wscale;
                opts->options |= OPTION_WSCALE;
                remaining -= TCPOLEN_WSCALE_ALIGNED;
@@ -3303,7 +3303,7 @@ static void tcp_connect_init(struct sock *sk)
                                  tp->advmss - (tp->rx_opt.ts_recent_stamp ? tp->tcp_header_len - sizeof(struct tcphdr) : 0),
                                  &tp->rcv_wnd,
                                  &tp->window_clamp,
-                                 sysctl_tcp_window_scaling,
+                                 sock_net(sk)->ipv4.sysctl_tcp_window_scaling,
                                  &rcv_wscale,
                                  dst_metric(dst, RTAX_INITRWND));