[NETNS][IPV6] anycast - handle several network namespace

Make use of the network namespace information to have this protocol to
handle several network namespace.

Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Signed-off-by: Benjamin Thery <benjamin.thery@bull.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 29 insertions, 23 deletions

diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index 12f04e9d3e88..1731b0abf7f5 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -862,11 +862,16 @@ static int inet6_net_init(struct net *net)
         err = tcp6_proc_init(net);
         if (err)
                 goto proc_tcp6_fail;
+        err = ac6_proc_init(net);
+        if (err)
+                goto proc_ac6_fail;
 out:
 #endif
         return err;
 
 #ifdef CONFIG_PROC_FS
+proc_ac6_fail:
+        tcp6_proc_exit(net);
 proc_tcp6_fail:
         udp6_proc_exit(net);
         goto out;
@@ -878,6 +883,7 @@ static void inet6_net_exit(struct net *net)
 #ifdef CONFIG_PROC_FS
         udp6_proc_exit(net);
         tcp6_proc_exit(net);
+        ac6_proc_exit(net);
 #endif
 }
 
@@ -965,9 +971,6 @@ static int __init inet6_init(void)
                 goto proc_udplite6_fail;
         if (ipv6_misc_proc_init())
                 goto proc_misc6_fail;
-
-        if (ac6_proc_init())
-                goto proc_anycast6_fail;
         if (if6_proc_init())
                 goto proc_if6_fail;
 #endif
@@ -1039,8 +1042,6 @@ ip6_route_fail:
 #ifdef CONFIG_PROC_FS
         if6_proc_exit();
 proc_if6_fail:
-        ac6_proc_exit();
-proc_anycast6_fail:
         ipv6_misc_proc_exit();
 proc_misc6_fail:
         udplite6_proc_exit();
@@ -1101,7 +1102,6 @@ static void __exit inet6_exit(void)
 
         /* Cleanup code parts. */
         if6_proc_exit();
-        ac6_proc_exit();
         ipv6_misc_proc_exit();
         udplite6_proc_exit();
         raw6_proc_exit();
diff --git a/net/ipv6/anycast.c b/net/ipv6/anycast.c
index 96868b994b37..463bd95d6b13 100644
--- a/net/ipv6/anycast.c
+++ b/net/ipv6/anycast.c
@@ -82,6 +82,7 @@ int ipv6_sock_ac_join(struct sock *sk, int ifindex, struct in6_addr *addr)
         struct net_device *dev = NULL;
         struct inet6_dev *idev;
         struct ipv6_ac_socklist *pac;
+        struct net *net = sock_net(sk);
         int     ishost = !ipv6_devconf.forwarding;
         int     err = 0;
 
@@ -89,7 +90,7 @@ int ipv6_sock_ac_join(struct sock *sk, int ifindex, struct in6_addr *addr)
                 return -EPERM;
         if (ipv6_addr_is_multicast(addr))
                 return -EINVAL;
-        if (ipv6_chk_addr(&init_net, addr, NULL, 0))
+        if (ipv6_chk_addr(net, addr, NULL, 0))
                 return -EINVAL;
 
         pac = sock_kmalloc(sk, sizeof(struct ipv6_ac_socklist), GFP_KERNEL);
@@ -101,7 +102,7 @@ int ipv6_sock_ac_join(struct sock *sk, int ifindex, struct in6_addr *addr)
         if (ifindex == 0) {
                 struct rt6_info *rt;
 
-                rt = rt6_lookup(&init_net, addr, NULL, 0, 0);
+                rt = rt6_lookup(net, addr, NULL, 0, 0);
                 if (rt) {
                         dev = rt->rt6i_dev;
                         dev_hold(dev);
@@ -112,10 +113,10 @@ int ipv6_sock_ac_join(struct sock *sk, int ifindex, struct in6_addr *addr)
                 } else {
                         /* router, no matching interface: just pick one */
 
-                        dev = dev_get_by_flags(&init_net, IFF_UP, IFF_UP|IFF_LOOPBACK);
+                        dev = dev_get_by_flags(net, IFF_UP, IFF_UP|IFF_LOOPBACK);
                 }
         } else
-                dev = dev_get_by_index(&init_net, ifindex);
+                dev = dev_get_by_index(net, ifindex);
 
         if (dev == NULL) {
                 err = -ENODEV;
@@ -176,6 +177,7 @@ int ipv6_sock_ac_drop(struct sock *sk, int ifindex, struct in6_addr *addr)
         struct ipv6_pinfo *np = inet6_sk(sk);
         struct net_device *dev;
         struct ipv6_ac_socklist *pac, *prev_pac;
+        struct net *net = sock_net(sk);
 
         write_lock_bh(&ipv6_sk_ac_lock);
         prev_pac = NULL;
@@ -196,7 +198,7 @@ int ipv6_sock_ac_drop(struct sock *sk, int ifindex, struct in6_addr *addr)
 
         write_unlock_bh(&ipv6_sk_ac_lock);
 
-        dev = dev_get_by_index(&init_net, pac->acl_ifindex);
+        dev = dev_get_by_index(net, pac->acl_ifindex);
         if (dev) {
                 ipv6_dev_ac_dec(dev, &pac->acl_addr);
                 dev_put(dev);
@@ -210,6 +212,7 @@ void ipv6_sock_ac_close(struct sock *sk)
         struct ipv6_pinfo *np = inet6_sk(sk);
         struct net_device *dev = NULL;
         struct ipv6_ac_socklist *pac;
+        struct net *net = sock_net(sk);
         int     prev_index;
 
         write_lock_bh(&ipv6_sk_ac_lock);
@@ -224,7 +227,7 @@ void ipv6_sock_ac_close(struct sock *sk)
                 if (pac->acl_ifindex != prev_index) {
                         if (dev)
                                 dev_put(dev);
-                        dev = dev_get_by_index(&init_net, pac->acl_ifindex);
+                        dev = dev_get_by_index(net, pac->acl_ifindex);
                         prev_index = pac->acl_ifindex;
                 }
                 if (dev)
@@ -422,14 +425,15 @@ static int ipv6_chk_acast_dev(struct net_device *dev, struct in6_addr *addr)
 /*
  *      check if given interface (or any, if dev==0) has this anycast address
  */
-int ipv6_chk_acast_addr(struct net_device *dev, struct in6_addr *addr)
+int ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
+                        struct in6_addr *addr)
 {
         int found = 0;
 
         if (dev)
                 return ipv6_chk_acast_dev(dev, addr);
         read_lock(&dev_base_lock);
-        for_each_netdev(&init_net, dev)
+        for_each_netdev(net, dev)
                 if (ipv6_chk_acast_dev(dev, addr)) {
                         found = 1;
                         break;
@@ -441,6 +445,7 @@ int ipv6_chk_acast_addr(struct net_device *dev, struct in6_addr *addr)
 
 #ifdef CONFIG_PROC_FS
 struct ac6_iter_state {
+        struct seq_net_private p;
         struct net_device *dev;
         struct inet6_dev *idev;
 };
@@ -451,9 +456,10 @@ static inline struct ifacaddr6 *ac6_get_first(struct seq_file *seq)
 {
         struct ifacaddr6 *im = NULL;
         struct ac6_iter_state *state = ac6_seq_private(seq);
+        struct net *net = seq_file_net(seq);
 
         state->idev = NULL;
-        for_each_netdev(&init_net, state->dev) {
+        for_each_netdev(net, state->dev) {
                 struct inet6_dev *idev;
                 idev = in6_dev_get(state->dev);
                 if (!idev)
@@ -551,8 +557,8 @@ static const struct seq_operations ac6_seq_ops = {
 
 static int ac6_seq_open(struct inode *inode, struct file *file)
 {
-        return seq_open_private(file, &ac6_seq_ops,
-                        sizeof(struct ac6_iter_state));
+        return seq_open_net(inode, file, &ac6_seq_ops,
+                            sizeof(struct ac6_iter_state));
 }
 
 static const struct file_operations ac6_seq_fops = {
@@ -560,20 +566,20 @@ static const struct file_operations ac6_seq_fops = {
         .open           =       ac6_seq_open,
         .read           =       seq_read,
         .llseek         =       seq_lseek,
-        .release        =       seq_release_private,
+        .release        =       seq_release_net,
 };
 
-int __init ac6_proc_init(void)
+int ac6_proc_init(struct net *net)
 {
-        if (!proc_net_fops_create(&init_net, "anycast6", S_IRUGO, &ac6_seq_fops))
+        if (!proc_net_fops_create(net, "anycast6", S_IRUGO, &ac6_seq_fops))
                 return -ENOMEM;
 
         return 0;
 }
 
-void ac6_proc_exit(void)
+void ac6_proc_exit(struct net *net)
 {
-        proc_net_remove(&init_net, "anycast6");
+        proc_net_remove(net, "anycast6");
 }
 #endif
 
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index 79af57f586e8..b4d8e331432e 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -773,7 +773,7 @@ static void ndisc_recv_ns(struct sk_buff *skb)
                         return;
                 }
 
-                if (ipv6_chk_acast_addr(dev, &msg->target) ||
+                if (ipv6_chk_acast_addr(dev_net(dev), dev, &msg->target) ||
                     (idev->cnf.forwarding &&
                      (ipv6_devconf.proxy_ndp || idev->cnf.proxy_ndp) &&
                      (pneigh = pneigh_lookup(&nd_tbl, dev_net(dev),