[NETNS]: Process IP layer in the context of the correct namespace.

Replace all the rest of the init_net with a proper net on the IP layer.
Signed-off-by: NDenis V. Lunev <den@openvz.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv4/ip_fragment.c

@@ -204,8 +204,11 @@ static void ip_expire(unsigned long arg)
 
 	if ((qp->q.last_in&FIRST_IN) && qp->q.fragments != NULL) {
 		struct sk_buff *head = qp->q.fragments;
+		struct net *net;
+
+		net = container_of(qp->q.net, struct net, ipv4.frags);
 		/* Send an ICMP "Fragment Reassembly Timeout" message. */
-		if ((head->dev = dev_get_by_index(&init_net, qp->iif)) != NULL) {
+		if ((head->dev = dev_get_by_index(net, qp->iif)) != NULL) {
 			icmp_send(head, ICMP_TIME_EXCEEDED, ICMP_EXC_FRAGTIME, 0);
 			dev_put(head->dev);
 		}

net/ipv4/ip_input.c

@@ -160,6 +160,7 @@ int ip_call_ra_chain(struct sk_buff *skb)
 	struct ip_ra_chain *ra;
 	u8 protocol = ip_hdr(skb)->protocol;
 	struct sock *last = NULL;
+	struct net_device *dev = skb->dev;
 
 	read_lock(&ip_ra_lock);
 	for (ra = ip_ra_chain; ra; ra = ra->next) {
@@ -170,7 +171,8 @@ int ip_call_ra_chain(struct sk_buff *skb)
 		 */
 		if (sk && inet_sk(sk)->num == protocol &&
 		    (!sk->sk_bound_dev_if ||
-		     sk->sk_bound_dev_if == skb->dev->ifindex)) {
+		     sk->sk_bound_dev_if == dev->ifindex) &&
+		    sk->sk_net == dev->nd_net) {
 			if (ip_hdr(skb)->frag_off & htons(IP_MF | IP_OFFSET)) {
 				if (ip_defrag(skb, IP_DEFRAG_CALL_RA_CHAIN)) {
 					read_unlock(&ip_ra_lock);
@@ -286,7 +288,7 @@ static inline int ip_rcv_options(struct sk_buff *skb)
 	opt = &(IPCB(skb)->opt);
 	opt->optlen = iph->ihl*4 - sizeof(struct iphdr);
 
-	if (ip_options_compile(&init_net, opt, skb)) {
+	if (ip_options_compile(dev->nd_net, opt, skb)) {
 		IP_INC_STATS_BH(IPSTATS_MIB_INHDRERRORS);
 		goto drop;
 	}

net/ipv4/ip_options.c

@@ -145,7 +145,7 @@ int ip_options_echo(struct ip_options * dopt, struct sk_buff * skb)
 						__be32 addr;
 
 						memcpy(&addr, sptr+soffset-1, 4);
-						if (inet_addr_type(&init_net, addr) != RTN_LOCAL) {
+						if (inet_addr_type(skb->dst->dev->nd_net, addr) != RTN_LOCAL) {
 							dopt->ts_needtime = 1;
 							soffset += 8;
 						}

net/ipv4/ip_output.c

@@ -351,7 +351,7 @@ int ip_queue_xmit(struct sk_buff *skb, int ipfragok)
 			 * itself out.
 			 */
 			security_sk_classify_flow(sk, &fl);
-			if (ip_route_output_flow(&init_net, &rt, &fl, sk, 0))
+			if (ip_route_output_flow(sk->sk_net, &rt, &fl, sk, 0))
 				goto no_route;
 		}
 		sk_setup_caps(sk, &rt->u.dst);

net/ipv4/ip_sockglue.c

@@ -449,7 +449,8 @@ static int do_ip_setsockopt(struct sock *sk, int level,
 		struct ip_options * opt = NULL;
 		if (optlen > 40 || optlen < 0)
 			goto e_inval;
-		err = ip_options_get_from_user(&init_net, &opt, optval, optlen);
+		err = ip_options_get_from_user(sk->sk_net, &opt,
+					       optval, optlen);
 		if (err)
 			break;
 		if (inet->is_icsk) {
@@ -589,13 +590,13 @@ static int do_ip_setsockopt(struct sock *sk, int level,
 				err = 0;
 				break;
 			}
-			dev = ip_dev_find(&init_net, mreq.imr_address.s_addr);
+			dev = ip_dev_find(sk->sk_net, mreq.imr_address.s_addr);
 			if (dev) {
 				mreq.imr_ifindex = dev->ifindex;
 				dev_put(dev);
 			}
 		} else
-			dev = __dev_get_by_index(&init_net, mreq.imr_ifindex);
+			dev = __dev_get_by_index(sk->sk_net, mreq.imr_ifindex);
 
 
 		err = -EADDRNOTAVAIL;