net: Add sysctl to toggle early demux for tcp and udp

[linux-2.6-block.git] / net / ipv4 / sysctl_net_ipv4.c

diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index 711c3e2e17b1a46925deb99a2e22916610388033..6fb25693c00b92cbf881a13b06f2276b288853b1 100644 (file)
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -24,6 +24,7 @@
 #include <net/cipso_ipv4.h>
 #include <net/inet_frag.h>
 #include <net/ping.h>
+#include <net/protocol.h>
 
 static int zero;
 static int one = 1;
@@ -294,6 +295,58 @@ bad_key:
        return ret;
 }
 
+static void proc_configure_early_demux(int enabled, int protocol)
+{
+       struct net_protocol *ipprot;
+#if IS_ENABLED(CONFIG_IPV6)
+       struct inet6_protocol *ip6prot;
+#endif
+
+       ipprot = rcu_dereference(inet_protos[protocol]);
+       if (ipprot)
+               ipprot->early_demux = enabled ? ipprot->early_demux_handler :
+                                               NULL;
+
+#if IS_ENABLED(CONFIG_IPV6)
+       ip6prot = rcu_dereference(inet6_protos[protocol]);
+       if (ip6prot)
+               ip6prot->early_demux = enabled ? ip6prot->early_demux_handler :
+                                                NULL;
+#endif
+}
+
+static int proc_tcp_early_demux(struct ctl_table *table, int write,
+                               void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+       int ret = 0;
+
+       ret = proc_dointvec(table, write, buffer, lenp, ppos);
+
+       if (write && !ret) {
+               int enabled = init_net.ipv4.sysctl_tcp_early_demux;
+
+               proc_configure_early_demux(enabled, IPPROTO_TCP);
+       }
+
+       return ret;
+}
+
+static int proc_udp_early_demux(struct ctl_table *table, int write,
+                               void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+       int ret = 0;
+
+       ret = proc_dointvec(table, write, buffer, lenp, ppos);
+
+       if (write && !ret) {
+               int enabled = init_net.ipv4.sysctl_udp_early_demux;
+
+               proc_configure_early_demux(enabled, IPPROTO_UDP);
+       }
+
+       return ret;
+}
+
 static struct ctl_table ipv4_table[] = {
        {
                .procname       = "tcp_timestamps",
@@ -749,6 +802,20 @@ static struct ctl_table ipv4_net_table[] = {
                .mode           = 0644,
                .proc_handler   = proc_dointvec
        },
+       {
+               .procname       = "udp_early_demux",
+               .data           = &init_net.ipv4.sysctl_udp_early_demux,
+               .maxlen         = sizeof(int),
+               .mode           = 0644,
+               .proc_handler   = proc_udp_early_demux
+       },
+       {
+               .procname       = "tcp_early_demux",
+               .data           = &init_net.ipv4.sysctl_tcp_early_demux,
+               .maxlen         = sizeof(int),
+               .mode           = 0644,
+               .proc_handler   = proc_tcp_early_demux
+       },
        {
                .procname       = "ip_default_ttl",
                .data           = &init_net.ipv4.sysctl_ip_default_ttl,