inet: make no_pmtu_disc per namespace and kill ipv4_config

The other field in ipv4_config, log_martians, was converted to a
per-interface setting, so we can just remove the whole structure.
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/ip.h

@@ -177,12 +177,6 @@ void ip_send_unicast_reply(struct net *net, struct sk_buff *skb, __be32 daddr,
 			   __be32 saddr, const struct ip_reply_arg *arg,
 			   unsigned int len);
 
-struct ipv4_config {
-	int	log_martians;
-	int	no_pmtu_disc;
-};
-
-extern struct ipv4_config ipv4_config;
 #define IP_INC_STATS(net, field)	SNMP_INC_STATS64((net)->mib.ip_statistics, field)
 #define IP_INC_STATS_BH(net, field)	SNMP_INC_STATS64_BH((net)->mib.ip_statistics, field)
 #define IP_ADD_STATS(net, field, val)	SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val)

include/net/netns/ipv4.h

@@ -69,6 +69,7 @@ struct netns_ipv4 {
 	struct local_ports sysctl_local_ports;
 
 	int sysctl_tcp_ecn;
+	int sysctl_ip_no_pmtu_disc;
 
 	kgid_t sysctl_ping_group_range[2];
 

net/ipv4/af_inet.c

@@ -126,9 +126,6 @@
 static struct list_head inetsw[SOCK_MAX];
 static DEFINE_SPINLOCK(inetsw_lock);
 
-struct ipv4_config ipv4_config;
-EXPORT_SYMBOL(ipv4_config);
-
 /* New destruction routine */
 
 void inet_sock_destruct(struct sock *sk)
@@ -342,7 +339,7 @@ static int inet_create(struct net *net, struct socket *sock, int protocol,
 			inet->hdrincl = 1;
 	}
 
-	if (ipv4_config.no_pmtu_disc)
+	if (net->ipv4.sysctl_ip_no_pmtu_disc)
 		inet->pmtudisc = IP_PMTUDISC_DONT;
 	else
 		inet->pmtudisc = IP_PMTUDISC_WANT;

net/ipv4/icmp.c

@@ -705,7 +705,7 @@ static void icmp_unreach(struct sk_buff *skb)
 		case ICMP_PORT_UNREACH:
 			break;
 		case ICMP_FRAG_NEEDED:
-			if (ipv4_config.no_pmtu_disc) {
+			if (net->ipv4.sysctl_ip_no_pmtu_disc) {
 				LIMIT_NETDEBUG(KERN_INFO pr_fmt("%pI4: fragmentation needed and DF set\n"),
 					       &iph->daddr);
 			} else {

net/ipv4/sysctl_net_ipv4.c

@@ -285,13 +285,6 @@ static struct ctl_table ipv4_table[] = {
 		.extra1		= &ip_ttl_min,
 		.extra2		= &ip_ttl_max,
 	},
-	{
-		.procname	= "ip_no_pmtu_disc",
-		.data		= &ipv4_config.no_pmtu_disc,
-		.maxlen		= sizeof(int),
-		.mode		= 0644,
-		.proc_handler	= proc_dointvec
-	},
 	{
 		.procname	= "ip_nonlocal_bind",
 		.data		= &sysctl_ip_nonlocal_bind,
@@ -831,6 +824,13 @@ static struct ctl_table ipv4_net_table[] = {
 		.mode		= 0644,
 		.proc_handler	= ipv4_local_port_range,
 	},
+	{
+		.procname	= "ip_no_pmtu_disc",
+		.data		= &init_net.ipv4.sysctl_ip_no_pmtu_disc,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec
+	},
 	{ }
 };
 

net/ipv4/xfrm4_state.c

@@ -16,7 +16,7 @@
 
 static int xfrm4_init_flags(struct xfrm_state *x)
 {
-	if (ipv4_config.no_pmtu_disc)
+	if (xs_net(x)->ipv4.sysctl_ip_no_pmtu_disc)
 		x->props.flags |= XFRM_STATE_NOPMTUDISC;
 	return 0;
 }

net/ipv6/af_inet6.c

@@ -213,7 +213,7 @@ static int inet6_create(struct net *net, struct socket *sock, int protocol,
 	inet->mc_list	= NULL;
 	inet->rcv_tos	= 0;
 
-	if (ipv4_config.no_pmtu_disc)
+	if (net->ipv4.sysctl_ip_no_pmtu_disc)
 		inet->pmtudisc = IP_PMTUDISC_DONT;
 	else
 		inet->pmtudisc = IP_PMTUDISC_WANT;