[patch 38/38][IPV6] ndisc - make ndisc handle multiple network namespaces

[Daniel Lezcano <dlezcano@xxxxxxxxxx>]

Make ndisc handle multiple network namespaces: 
Remove references to init_net, add network namespace parameters and add 
pernet_operations for ndisc

Signed-off-by: Daniel Lezcano <dlezcano@xxxxxxxxxx>
Signed-off-by: Benjamin Thery <benjamin.thery@xxxxxxxx>
---
 net/ipv6/ndisc.c |   90 +++++++++++++++++++++++++++++++++----------------------
 1 file changed, 55 insertions(+), 35 deletions(-)

Index: linux-2.6-netns/net/ipv6/ndisc.c
===================================================================
--- linux-2.6-netns.orig/net/ipv6/ndisc.c
+++ linux-2.6-netns/net/ipv6/ndisc.c
@@ -442,12 +442,12 @@ static void pndisc_destructor(struct pne
  *	Send a Neighbour Advertisement
  */
 
-static inline void ndisc_flow_init(struct flowi *fl, u8 type,
+static inline void ndisc_flow_init(struct net *net, struct flowi *fl, u8 type,
 			    struct in6_addr *saddr, struct in6_addr *daddr,
 			    int oif)
 {
 	memset(fl, 0, sizeof(*fl));
-	fl->fl_net = &init_net;
+	fl->fl_net = net;
 	ipv6_addr_copy(&fl->fl6_src, saddr);
 	ipv6_addr_copy(&fl->fl6_dst, daddr);
 	fl->proto	 	= IPPROTO_ICMPV6;
@@ -475,7 +475,7 @@ static void __ndisc_send(struct net_devi
 
 	type = icmp6h->icmp6_type;
 
-	ndisc_flow_init(&fl, type, saddr, daddr,
+	ndisc_flow_init(dev->nd_net, &fl, type, saddr, daddr,
 			dev->ifindex);
 
 	dst = ndisc_dst_alloc(dev, neigh, daddr, ip6_output);
@@ -791,7 +791,7 @@ static void ndisc_recv_ns(struct sk_buff
 		if (ipv6_chk_acast_addr(dev, &msg->target) ||
 		    (idev->cnf.forwarding &&
 		     (ipv6_devconf.proxy_ndp || idev->cnf.proxy_ndp) &&
-		     (pneigh = pneigh_lookup(&nd_tbl, &init_net,
+		     (pneigh = pneigh_lookup(&nd_tbl, dev->nd_net,
 					     &msg->target, dev, 0)) != NULL)) {
 			if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) &&
 			    skb->pkt_type != PACKET_HOST &&
@@ -932,7 +932,7 @@ static void ndisc_recv_na(struct sk_buff
 		 */
 		if (lladdr && !memcmp(lladdr, dev->dev_addr, dev->addr_len) &&
 		    ipv6_devconf.forwarding && ipv6_devconf.proxy_ndp &&
-		    pneigh_lookup(&nd_tbl, &init_net, &msg->target, dev, 0)) {
+		    pneigh_lookup(&nd_tbl, dev->nd_net, &msg->target, dev, 0)) {
 			/* XXX: idev->cnf.prixy_ndp */
 			goto out;
 		}
@@ -1440,8 +1440,8 @@ void ndisc_send_redirect(struct sk_buff 
 		return;
 	}
 
-	ndisc_flow_init(&fl, NDISC_REDIRECT, &saddr_buf, &ipv6_hdr(skb)->saddr,
-			dev->ifindex);
+	ndisc_flow_init(dev->nd_net, &fl, NDISC_REDIRECT, &saddr_buf,
+			&ipv6_hdr(skb)->saddr, dev->ifindex);
 
 	dst = ip6_route_output(NULL, &fl);
 	if (dst == NULL)
@@ -1616,9 +1616,6 @@ static int ndisc_netdev_event(struct not
 	struct net_device *dev = ptr;
 	struct net *net = dev->nd_net;
 
-	if (dev->nd_net != &init_net)
-		return NOTIFY_DONE;
-
 	switch (event) {
 	case NETDEV_CHANGEADDR:
 		neigh_changeaddr(&nd_tbl, dev);
@@ -1735,6 +1732,52 @@ static int ndisc_ifinfo_sysctl_strategy(
 
 #endif
 
+static int ndisc_net_init(struct net *net)
+{
+	int err = 0;
+
+	net->ndisc_neigh_parms_default =
+		neigh_parms_alloc_default(&nd_tbl, net);
+	if (!net->ndisc_neigh_parms_default) {
+		err = -ENOMEM;
+		goto out;
+	}
+
+#ifdef CONFIG_SYSCTL
+	if ((err = neigh_sysctl_register(NULL,
+					 net->ndisc_neigh_parms_default,
+					 NET_IPV6, NET_IPV6_NEIGH,
+					 "ipv6",
+					 &ndisc_ifinfo_sysctl_change,
+					 &ndisc_ifinfo_sysctl_strategy)))
+	     goto out_sysctl;
+#endif
+out:
+	return err;
+#ifdef CONFIG_SYSCTL
+out_sysctl:
+	neigh_parms_release(&nd_tbl, net->ndisc_neigh_parms_default);
+	goto out;
+#endif
+}
+
+static void ndisc_net_exit(struct net *net)
+{
+	struct neigh_parms *parms = net->ndisc_neigh_parms_default;
+	if (parms) {
+#ifdef CONFIG_SYSCTL
+		neigh_sysctl_unregister(parms);
+#endif
+		neigh_parms_release(&nd_tbl, parms);
+		net->ndisc_neigh_parms_default = NULL;
+	}
+}
+
+static struct pernet_operations ndisc_net_ops = {
+	.init = ndisc_net_init,
+	.exit = ndisc_net_exit,
+};
+
 int __init ndisc_init(struct net_proto_family *ops)
 {
 	struct ipv6_pinfo *np;
@@ -1764,32 +1807,9 @@ int __init ndisc_init(struct net_proto_f
 
 	neigh_table_init(&nd_tbl);
 
-	init_net.ndisc_neigh_parms_default =
-		neigh_parms_alloc_default(&nd_tbl, &init_net);
-	if (!init_net.ndisc_neigh_parms_default) {
-		err = -ENOMEM;
-		goto out_neigh_parms;
-	}
-
-#ifdef CONFIG_SYSCTL
-	if ((err = neigh_sysctl_register(NULL,
-					 init_net.ndisc_neigh_parms_default,
-					 NET_IPV6, NET_IPV6_NEIGH,
-					 "ipv6",
-					 &ndisc_ifinfo_sysctl_change,
-					 &ndisc_ifinfo_sysctl_strategy)))
-	     goto out_sysctl;
-#endif
+	register_pernet_subsys(&ndisc_net_ops);
 	register_netdevice_notifier(&ndisc_netdev_notifier);
-out:
-	return err;
-#ifdef CONFIG_SYSCTL
-out_sysctl:
-	neigh_parms_release(&nd_tbl, init_net.ndisc_neigh_parms_default);
-#endif
-out_neigh_parms:
-	sock_release(ndisc_socket);
-	goto out;
+	return 0;
 }
 
 void ndisc_cleanup(void)

-- 
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