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);