1 files changed, 146 insertions, 82 deletions

diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index e7821ba7a9a0..2ada033406de 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -39,6 +39,8 @@
 #include <net/dsfield.h>
 #include <net/inet_ecn.h>
 #include <net/xfrm.h>
+#include <net/net_namespace.h>
+#include <net/netns/generic.h>
 
 #ifdef CONFIG_IPV6
 #include <net/ipv6.h>
@@ -122,7 +124,14 @@ static void ipgre_tunnel_setup(struct net_device *dev);
 
 static int ipgre_fb_tunnel_init(struct net_device *dev);
 
-static struct net_device *ipgre_fb_tunnel_dev;
+#define HASH_SIZE  16
+
+static int ipgre_net_id;
+struct ipgre_net {
+	struct ip_tunnel *tunnels[4][HASH_SIZE];
+
+	struct net_device *fb_tunnel_dev;
+};
 
 /* Tunnel hash table */
 
@@ -142,39 +151,38 @@ static struct net_device *ipgre_fb_tunnel_dev;
    will match fallback tunnel.
  */
 
-#define HASH_SIZE  16
 #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF)
 
-static struct ip_tunnel *tunnels[4][HASH_SIZE];
-
-#define tunnels_r_l	(tunnels[3])
-#define tunnels_r	(tunnels[2])
-#define tunnels_l	(tunnels[1])
-#define tunnels_wc	(tunnels[0])
+#define tunnels_r_l	tunnels[3]
+#define tunnels_r	tunnels[2]
+#define tunnels_l	tunnels[1]
+#define tunnels_wc	tunnels[0]
 
 static DEFINE_RWLOCK(ipgre_lock);
 
 /* Given src, dst and key, find appropriate for input tunnel. */
 
-static struct ip_tunnel * ipgre_tunnel_lookup(__be32 remote, __be32 local, __be32 key)
+static struct ip_tunnel * ipgre_tunnel_lookup(struct net *net,
+		__be32 remote, __be32 local, __be32 key)
 {
 	unsigned h0 = HASH(remote);
 	unsigned h1 = HASH(key);
 	struct ip_tunnel *t;
+	struct ipgre_net *ign = net_generic(net, ipgre_net_id);
 
-	for (t = tunnels_r_l[h0^h1]; t; t = t->next) {
+	for (t = ign->tunnels_r_l[h0^h1]; t; t = t->next) {
 		if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr) {
 			if (t->parms.i_key == key && (t->dev->flags&IFF_UP))
 				return t;
 		}
 	}
-	for (t = tunnels_r[h0^h1]; t; t = t->next) {
+	for (t = ign->tunnels_r[h0^h1]; t; t = t->next) {
 		if (remote == t->parms.iph.daddr) {
 			if (t->parms.i_key == key && (t->dev->flags&IFF_UP))
 				return t;
 		}
 	}
-	for (t = tunnels_l[h1]; t; t = t->next) {
+	for (t = ign->tunnels_l[h1]; t; t = t->next) {
 		if (local == t->parms.iph.saddr ||
 		     (local == t->parms.iph.daddr &&
 		      ipv4_is_multicast(local))) {
@@ -182,17 +190,18 @@ static struct ip_tunnel * ipgre_tunnel_lookup(__be32 remote, __be32 local, __be3
 				return t;
 		}
 	}
-	for (t = tunnels_wc[h1]; t; t = t->next) {
+	for (t = ign->tunnels_wc[h1]; t; t = t->next) {
 		if (t->parms.i_key == key && (t->dev->flags&IFF_UP))
 			return t;
 	}
 
-	if (ipgre_fb_tunnel_dev->flags&IFF_UP)
-		return netdev_priv(ipgre_fb_tunnel_dev);
+	if (ign->fb_tunnel_dev->flags&IFF_UP)
+		return netdev_priv(ign->fb_tunnel_dev);
 	return NULL;
 }
 
-static struct ip_tunnel **__ipgre_bucket(struct ip_tunnel_parm *parms)
+static struct ip_tunnel **__ipgre_bucket(struct ipgre_net *ign,
+		struct ip_tunnel_parm *parms)
 {
 	__be32 remote = parms->iph.daddr;
 	__be32 local = parms->iph.saddr;
@@ -207,17 +216,18 @@ static struct ip_tunnel **__ipgre_bucket(struct ip_tunnel_parm *parms)
 		h ^= HASH(remote);
 	}
 
-	return &tunnels[prio][h];
+	return &ign->tunnels[prio][h];
 }
 
-static inline struct ip_tunnel **ipgre_bucket(struct ip_tunnel *t)
+static inline struct ip_tunnel **ipgre_bucket(struct ipgre_net *ign,
+		struct ip_tunnel *t)
 {
-	return __ipgre_bucket(&t->parms);
+	return __ipgre_bucket(ign, &t->parms);
 }
 
-static void ipgre_tunnel_link(struct ip_tunnel *t)
+static void ipgre_tunnel_link(struct ipgre_net *ign, struct ip_tunnel *t)
 {
-	struct ip_tunnel **tp = ipgre_bucket(t);
+	struct ip_tunnel **tp = ipgre_bucket(ign, t);
 
 	t->next = *tp;
 	write_lock_bh(&ipgre_lock);
@@ -225,11 +235,11 @@ static void ipgre_tunnel_link(struct ip_tunnel *t)
 	write_unlock_bh(&ipgre_lock);
 }
 
-static void ipgre_tunnel_unlink(struct ip_tunnel *t)
+static void ipgre_tunnel_unlink(struct ipgre_net *ign, struct ip_tunnel *t)
 {
 	struct ip_tunnel **tp;
 
-	for (tp = ipgre_bucket(t); *tp; tp = &(*tp)->next) {
+	for (tp = ipgre_bucket(ign, t); *tp; tp = &(*tp)->next) {
 		if (t == *tp) {
 			write_lock_bh(&ipgre_lock);
 			*tp = t->next;
@@ -239,7 +249,8 @@ static void ipgre_tunnel_unlink(struct ip_tunnel *t)
 	}
 }
 
-static struct ip_tunnel * ipgre_tunnel_locate(struct ip_tunnel_parm *parms, int create)
+static struct ip_tunnel * ipgre_tunnel_locate(struct net *net,
+		struct ip_tunnel_parm *parms, int create)
 {
 	__be32 remote = parms->iph.daddr;
 	__be32 local = parms->iph.saddr;
@@ -247,8 +258,9 @@ static struct ip_tunnel * ipgre_tunnel_locate(struct ip_tunnel_parm *parms, int
 	struct ip_tunnel *t, **tp, *nt;
 	struct net_device *dev;
 	char name[IFNAMSIZ];
+	struct ipgre_net *ign = net_generic(net, ipgre_net_id);
 
-	for (tp = __ipgre_bucket(parms); (t = *tp) != NULL; tp = &t->next) {
+	for (tp = __ipgre_bucket(ign, parms); (t = *tp) != NULL; tp = &t->next) {
 		if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr) {
 			if (key == t->parms.i_key)
 				return t;
@@ -266,6 +278,8 @@ static struct ip_tunnel * ipgre_tunnel_locate(struct ip_tunnel_parm *parms, int
 	if (!dev)
 	  return NULL;
 
+	dev_net_set(dev, net);
+
 	if (strchr(name, '%')) {
 		if (dev_alloc_name(dev, name) < 0)
 			goto failed_free;
@@ -279,7 +293,7 @@ static struct ip_tunnel * ipgre_tunnel_locate(struct ip_tunnel_parm *parms, int
 		goto failed_free;
 
 	dev_hold(dev);
-	ipgre_tunnel_link(nt);
+	ipgre_tunnel_link(ign, nt);
 	return nt;
 
 failed_free:
@@ -289,7 +303,10 @@ failed_free:
 
 static void ipgre_tunnel_uninit(struct net_device *dev)
 {
-	ipgre_tunnel_unlink(netdev_priv(dev));
+	struct net *net = dev_net(dev);
+	struct ipgre_net *ign = net_generic(net, ipgre_net_id);
+
+	ipgre_tunnel_unlink(ign, netdev_priv(dev));
 	dev_put(dev);
 }
 
@@ -363,7 +380,9 @@ static void ipgre_err(struct sk_buff *skb, u32 info)
 	}
 
 	read_lock(&ipgre_lock);
-	t = ipgre_tunnel_lookup(iph->daddr, iph->saddr, (flags&GRE_KEY) ? *(((__be32*)p) + (grehlen>>2) - 1) : 0);
+	t = ipgre_tunnel_lookup(dev_net(skb->dev), iph->daddr, iph->saddr,
+			(flags&GRE_KEY) ?
+			*(((__be32*)p) + (grehlen>>2) - 1) : 0);
 	if (t == NULL || t->parms.iph.daddr == 0 ||
 	    ipv4_is_multicast(t->parms.iph.daddr))
 		goto out;
@@ -476,7 +495,7 @@ out:
 	fl.fl4_dst = eiph->saddr;
 	fl.fl4_tos = RT_TOS(eiph->tos);
 	fl.proto = IPPROTO_GRE;
-	if (ip_route_output_key(&init_net, &rt, &fl)) {
+	if (ip_route_output_key(dev_net(skb->dev), &rt, &fl)) {
 		kfree_skb(skb2);
 		return;
 	}
@@ -489,7 +508,7 @@ out:
 		fl.fl4_dst = eiph->daddr;
 		fl.fl4_src = eiph->saddr;
 		fl.fl4_tos = eiph->tos;
-		if (ip_route_output_key(&init_net, &rt, &fl) ||
+		if (ip_route_output_key(dev_net(skb->dev), &rt, &fl) ||
 		    rt->u.dst.dev->type != ARPHRD_IPGRE) {
 			ip_rt_put(rt);
 			kfree_skb(skb2);
@@ -596,7 +615,8 @@ static int ipgre_rcv(struct sk_buff *skb)
 	}
 
 	read_lock(&ipgre_lock);
-	if ((tunnel = ipgre_tunnel_lookup(iph->saddr, iph->daddr, key)) != NULL) {
+	if ((tunnel = ipgre_tunnel_lookup(dev_net(skb->dev),
+					iph->saddr, iph->daddr, key)) != NULL) {
 		secpath_reset(skb);
 
 		skb->protocol = *(__be16*)(h + 2);
@@ -619,7 +639,7 @@ static int ipgre_rcv(struct sk_buff *skb)
 #ifdef CONFIG_NET_IPGRE_BROADCAST
 		if (ipv4_is_multicast(iph->daddr)) {
 			/* Looped back packet, drop it! */
-			if (((struct rtable*)skb->dst)->fl.iif == 0)
+			if (skb->rtable->fl.iif == 0)
 				goto drop;
 			tunnel->stat.multicast++;
 			skb->pkt_type = PACKET_BROADCAST;
@@ -699,7 +719,7 @@ static int ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
 		}
 
 		if (skb->protocol == htons(ETH_P_IP)) {
-			rt = (struct rtable*)skb->dst;
+			rt = skb->rtable;
 			if ((dst = rt->rt_gateway) == 0)
 				goto tx_error_icmp;
 		}
@@ -744,7 +764,7 @@ static int ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
 						.saddr = tiph->saddr,
 						.tos = RT_TOS(tos) } },
 				    .proto = IPPROTO_GRE };
-		if (ip_route_output_key(&init_net, &rt, &fl)) {
+		if (ip_route_output_key(dev_net(dev), &rt, &fl)) {
 			tunnel->stat.tx_carrier_errors++;
 			goto tx_error;
 		}
@@ -917,7 +937,7 @@ static void ipgre_tunnel_bind_dev(struct net_device *dev)
 						.tos = RT_TOS(iph->tos) } },
 				    .proto = IPPROTO_GRE };
 		struct rtable *rt;
-		if (!ip_route_output_key(&init_net, &rt, &fl)) {
+		if (!ip_route_output_key(dev_net(dev), &rt, &fl)) {
 			tdev = rt->u.dst.dev;
 			ip_rt_put(rt);
 		}
@@ -925,7 +945,7 @@ static void ipgre_tunnel_bind_dev(struct net_device *dev)
 	}
 
 	if (!tdev && tunnel->parms.link)
-		tdev = __dev_get_by_index(&init_net, tunnel->parms.link);
+		tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link);
 
 	if (tdev) {
 		hlen = tdev->hard_header_len;
@@ -954,16 +974,18 @@ ipgre_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
 	int err = 0;
 	struct ip_tunnel_parm p;
 	struct ip_tunnel *t;
+	struct net *net = dev_net(dev);
+	struct ipgre_net *ign = net_generic(net, ipgre_net_id);
 
 	switch (cmd) {
 	case SIOCGETTUNNEL:
 		t = NULL;
-		if (dev == ipgre_fb_tunnel_dev) {
+		if (dev == ign->fb_tunnel_dev) {
 			if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
 				err = -EFAULT;
 				break;
 			}
-			t = ipgre_tunnel_locate(&p, 0);
+			t = ipgre_tunnel_locate(net, &p, 0);
 		}
 		if (t == NULL)
 			t = netdev_priv(dev);
@@ -995,9 +1017,9 @@ ipgre_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
 		if (!(p.o_flags&GRE_KEY))
 			p.o_key = 0;
 
-		t = ipgre_tunnel_locate(&p, cmd == SIOCADDTUNNEL);
+		t = ipgre_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL);
 
-		if (dev != ipgre_fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
+		if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
 			if (t != NULL) {
 				if (t->dev != dev) {
 					err = -EEXIST;
@@ -1017,14 +1039,14 @@ ipgre_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
 					err = -EINVAL;
 					break;
 				}
-				ipgre_tunnel_unlink(t);
+				ipgre_tunnel_unlink(ign, t);
 				t->parms.iph.saddr = p.iph.saddr;
 				t->parms.iph.daddr = p.iph.daddr;
 				t->parms.i_key = p.i_key;
 				t->parms.o_key = p.o_key;
 				memcpy(dev->dev_addr, &p.iph.saddr, 4);
 				memcpy(dev->broadcast, &p.iph.daddr, 4);
-				ipgre_tunnel_link(t);
+				ipgre_tunnel_link(ign, t);
 				netdev_state_change(dev);
 			}
 		}
@@ -1052,15 +1074,15 @@ ipgre_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
 		if (!capable(CAP_NET_ADMIN))
 			goto done;
 
-		if (dev == ipgre_fb_tunnel_dev) {
+		if (dev == ign->fb_tunnel_dev) {
 			err = -EFAULT;
 			if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
 				goto done;
 			err = -ENOENT;
-			if ((t = ipgre_tunnel_locate(&p, 0)) == NULL)
+			if ((t = ipgre_tunnel_locate(net, &p, 0)) == NULL)
 				goto done;
 			err = -EPERM;
-			if (t == netdev_priv(ipgre_fb_tunnel_dev))
+			if (t == netdev_priv(ign->fb_tunnel_dev))
 				goto done;
 			dev = t->dev;
 		}
@@ -1173,7 +1195,7 @@ static int ipgre_open(struct net_device *dev)
 						.tos = RT_TOS(t->parms.iph.tos) } },
 				    .proto = IPPROTO_GRE };
 		struct rtable *rt;
-		if (ip_route_output_key(&init_net, &rt, &fl))
+		if (ip_route_output_key(dev_net(dev), &rt, &fl))
 			return -EADDRNOTAVAIL;
 		dev = rt->u.dst.dev;
 		ip_rt_put(rt);
@@ -1190,7 +1212,7 @@ static int ipgre_close(struct net_device *dev)
 	struct ip_tunnel *t = netdev_priv(dev);
 	if (ipv4_is_multicast(t->parms.iph.daddr) && t->mlink) {
 		struct in_device *in_dev;
-		in_dev = inetdev_by_index(dev->nd_net, t->mlink);
+		in_dev = inetdev_by_index(dev_net(dev), t->mlink);
 		if (in_dev) {
 			ip_mc_dec_group(in_dev, t->parms.iph.daddr);
 			in_dev_put(in_dev);
@@ -1216,6 +1238,7 @@ static void ipgre_tunnel_setup(struct net_device *dev)
 	dev->flags		= IFF_NOARP;
 	dev->iflink		= 0;
 	dev->addr_len		= 4;
+	dev->features		|= NETIF_F_NETNS_LOCAL;
 }
 
 static int ipgre_tunnel_init(struct net_device *dev)
@@ -1251,10 +1274,11 @@ static int ipgre_tunnel_init(struct net_device *dev)
 	return 0;
 }
 
-static int __init ipgre_fb_tunnel_init(struct net_device *dev)
+static int ipgre_fb_tunnel_init(struct net_device *dev)
 {
 	struct ip_tunnel *tunnel = netdev_priv(dev);
 	struct iphdr *iph = &tunnel->parms.iph;
+	struct ipgre_net *ign = net_generic(dev_net(dev), ipgre_net_id);
 
 	tunnel->dev = dev;
 	strcpy(tunnel->parms.name, dev->name);
@@ -1265,7 +1289,7 @@ static int __init ipgre_fb_tunnel_init(struct net_device *dev)
 	tunnel->hlen		= sizeof(struct iphdr) + 4;
 
 	dev_hold(dev);
-	tunnels_wc[0]		= tunnel;
+	ign->tunnels_wc[0]	= tunnel;
 	return 0;
 }
 
@@ -1273,56 +1297,98 @@ static int __init ipgre_fb_tunnel_init(struct net_device *dev)
 static struct net_protocol ipgre_protocol = {
 	.handler	=	ipgre_rcv,
 	.err_handler	=	ipgre_err,
+	.netns_ok	=	1,
 };
 
+static void ipgre_destroy_tunnels(struct ipgre_net *ign)
+{
+	int prio;
 
-/*
- *	And now the modules code and kernel interface.
- */
+	for (prio = 0; prio < 4; prio++) {
+		int h;
+		for (h = 0; h < HASH_SIZE; h++) {
+			struct ip_tunnel *t;
+			while ((t = ign->tunnels[prio][h]) != NULL)
+				unregister_netdevice(t->dev);
+		}
+	}
+}
 
-static int __init ipgre_init(void)
+static int ipgre_init_net(struct net *net)
 {
 	int err;
+	struct ipgre_net *ign;
 
-	printk(KERN_INFO "GRE over IPv4 tunneling driver\n");
+	err = -ENOMEM;
+	ign = kzalloc(sizeof(struct ipgre_net), GFP_KERNEL);
+	if (ign == NULL)
+		goto err_alloc;
 
-	if (inet_add_protocol(&ipgre_protocol, IPPROTO_GRE) < 0) {
-		printk(KERN_INFO "ipgre init: can't add protocol\n");
-		return -EAGAIN;
-	}
+	err = net_assign_generic(net, ipgre_net_id, ign);
+	if (err < 0)
+		goto err_assign;
 
-	ipgre_fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "gre0",
+	ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "gre0",
 					   ipgre_tunnel_setup);
-	if (!ipgre_fb_tunnel_dev) {
+	if (!ign->fb_tunnel_dev) {
 		err = -ENOMEM;
-		goto err1;
+		goto err_alloc_dev;
 	}
 
-	ipgre_fb_tunnel_dev->init = ipgre_fb_tunnel_init;
+	ign->fb_tunnel_dev->init = ipgre_fb_tunnel_init;
+	dev_net_set(ign->fb_tunnel_dev, net);
 
-	if ((err = register_netdev(ipgre_fb_tunnel_dev)))
-		goto err2;
-out:
+	if ((err = register_netdev(ign->fb_tunnel_dev)))
+		goto err_reg_dev;
+
+	return 0;
+
+err_reg_dev:
+	free_netdev(ign->fb_tunnel_dev);
+err_alloc_dev:
+	/* nothing */
+err_assign:
+	kfree(ign);
+err_alloc:
 	return err;
-err2:
-	free_netdev(ipgre_fb_tunnel_dev);
-err1:
-	inet_del_protocol(&ipgre_protocol, IPPROTO_GRE);
-	goto out;
 }
 
-static void __exit ipgre_destroy_tunnels(void)
+static void ipgre_exit_net(struct net *net)
 {
-	int prio;
+	struct ipgre_net *ign;
 
-	for (prio = 0; prio < 4; prio++) {
-		int h;
-		for (h = 0; h < HASH_SIZE; h++) {
-			struct ip_tunnel *t;
-			while ((t = tunnels[prio][h]) != NULL)
-				unregister_netdevice(t->dev);
-		}
+	ign = net_generic(net, ipgre_net_id);
+	rtnl_lock();
+	ipgre_destroy_tunnels(ign);
+	rtnl_unlock();
+	kfree(ign);
+}
+
+static struct pernet_operations ipgre_net_ops = {
+	.init = ipgre_init_net,
+	.exit = ipgre_exit_net,
+};
+
+/*
+ *	And now the modules code and kernel interface.
+ */
+
+static int __init ipgre_init(void)
+{
+	int err;
+
+	printk(KERN_INFO "GRE over IPv4 tunneling driver\n");
+
+	if (inet_add_protocol(&ipgre_protocol, IPPROTO_GRE) < 0) {
+		printk(KERN_INFO "ipgre init: can't add protocol\n");
+		return -EAGAIN;
 	}
+
+	err = register_pernet_gen_device(&ipgre_net_id, &ipgre_net_ops);
+	if (err < 0)
+		inet_del_protocol(&ipgre_protocol, IPPROTO_GRE);
+
+	return err;
 }
 
 static void __exit ipgre_fini(void)
@@ -1330,9 +1396,7 @@ static void __exit ipgre_fini(void)
 	if (inet_del_protocol(&ipgre_protocol, IPPROTO_GRE) < 0)
 		printk(KERN_INFO "ipgre close: can't remove protocol\n");
 
-	rtnl_lock();
-	ipgre_destroy_tunnels();
-	rtnl_unlock();
+	unregister_pernet_gen_device(ipgre_net_id, &ipgre_net_ops);
 }
 
 module_init(ipgre_init);