igmp: net: Move igmp namespace init to correct file

When igmp related sysctl were namespacified their initializatin was
erroneously put into the tcp socket namespace constructor. This
patch moves the relevant code into the igmp namespace constructor to
keep things consistent.

Also sprinkle some #ifdefs to silence warnings

Signed-off-by: Nikolay Borisov <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/ipv4/igmp.c

···
 static void igmp_group_added(struct ip_mc_list *im)
 {
 	struct in_device *in_dev = im->interface;
+#ifdef CONFIG_IP_MULTICAST
 	struct net *net = dev_net(in_dev->dev);
+#endif
 
 	if (im->loaded == 0) {
 		im->loaded = 1;
···
 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
 {
 	struct ip_mc_list *im;
+#ifdef CONFIG_IP_MULTICAST
 	struct net *net = dev_net(in_dev->dev);
+#endif
 
 	ASSERT_RTNL();
 
···
 
 void ip_mc_init_dev(struct in_device *in_dev)
 {
+#ifdef CONFIG_IP_MULTICAST
 	struct net *net = dev_net(in_dev->dev);
+#endif
 	ASSERT_RTNL();
 
 #ifdef CONFIG_IP_MULTICAST
···
 void ip_mc_up(struct in_device *in_dev)
 {
 	struct ip_mc_list *pmc;
+#ifdef CONFIG_IP_MULTICAST
 	struct net *net = dev_net(in_dev->dev);
+#endif
 
 	ASSERT_RTNL();
 
···
 		goto out_sock;
 	}
 
+	/* Sysctl initialization */
+	net->ipv4.sysctl_igmp_max_memberships = 20;
+	net->ipv4.sysctl_igmp_max_msf = 10;
+	/* IGMP reports for link-local multicast groups are enabled by default */
+	net->ipv4.sysctl_igmp_llm_reports = 1;
+	net->ipv4.sysctl_igmp_qrv = 2;
 	return 0;
 
 out_sock:

net/ipv4/tcp_ipv4.c

···
 	net->ipv4.sysctl_tcp_fin_timeout = TCP_FIN_TIMEOUT;
 	net->ipv4.sysctl_tcp_notsent_lowat = UINT_MAX;
 
-	net->ipv4.sysctl_igmp_max_memberships = 20;
-	net->ipv4.sysctl_igmp_max_msf = 10;
-	/* IGMP reports for link-local multicast groups are enabled by default */
-	net->ipv4.sysctl_igmp_llm_reports = 1;
-	net->ipv4.sysctl_igmp_qrv = 2;
-
 	return 0;
 fail:
 	tcp_sk_exit(net);