[NET]: Make the device list and device lookups per namespace.

This patch makes most of the generic device layer network
namespace safe.  This patch makes dev_base_head a
network namespace variable, and then it picks up
a few associated variables.  The functions:
dev_getbyhwaddr
dev_getfirsthwbytype
dev_get_by_flags
dev_get_by_name
__dev_get_by_name
dev_get_by_index
__dev_get_by_index
dev_ioctl
dev_ethtool
dev_load
wireless_process_ioctl

were modified to take a network namespace argument, and
deal with it.

vlan_ioctl_set and brioctl_set were modified so their
hooks will receive a network namespace argument.

So basically anthing in the core of the network stack that was
affected to by the change of dev_base was modified to handle
multiple network namespaces.  The rest of the network stack was
simply modified to explicitly use &init_net the initial network
namespace.  This can be fixed when those components of the network
stack are modified to handle multiple network namespaces.

For now the ifindex generator is left global.

Fundametally ifindex numbers are per namespace, or else
we will have corner case problems with migration when
we get that far.

At the same time there are assumptions in the network stack
that the ifindex of a network device won't change.  Making
the ifindex number global seems a good compromise until
the network stack can cope with ifindex changes when
you change namespaces, and the like.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 14 insertions, 14 deletions

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 1a6783646520..ee55be975407 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -450,7 +450,7 @@ static void addrconf_forward_change(void)
         struct inet6_dev *idev;
 
         read_lock(&dev_base_lock);
-        for_each_netdev(dev) {
+        for_each_netdev(&init_net, dev) {
                 rcu_read_lock();
                 idev = __in6_dev_get(dev);
                 if (idev) {
@@ -912,7 +912,7 @@ int ipv6_dev_get_saddr(struct net_device *daddr_dev,
         read_lock(&dev_base_lock);
         rcu_read_lock();
 
-        for_each_netdev(dev) {
+        for_each_netdev(&init_net, dev) {
                 struct inet6_dev *idev;
                 struct inet6_ifaddr *ifa;
 
@@ -1858,7 +1858,7 @@ int addrconf_set_dstaddr(void __user *arg)
         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
                 goto err_exit;
 
-        dev = __dev_get_by_index(ireq.ifr6_ifindex);
+        dev = __dev_get_by_index(&init_net, ireq.ifr6_ifindex);
 
         err = -ENODEV;
         if (dev == NULL)
@@ -1889,7 +1889,7 @@ int addrconf_set_dstaddr(void __user *arg)
 
                 if (err == 0) {
                         err = -ENOBUFS;
-                        if ((dev = __dev_get_by_name(p.name)) == NULL)
+                        if ((dev = __dev_get_by_name(&init_net, p.name)) == NULL)
                                 goto err_exit;
                         err = dev_open(dev);
                 }
@@ -1919,7 +1919,7 @@ static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
         if (!valid_lft || prefered_lft > valid_lft)
                 return -EINVAL;
 
-        if ((dev = __dev_get_by_index(ifindex)) == NULL)
+        if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
                 return -ENODEV;
 
         if ((idev = addrconf_add_dev(dev)) == NULL)
@@ -1970,7 +1970,7 @@ static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
         struct inet6_dev *idev;
         struct net_device *dev;
 
-        if ((dev = __dev_get_by_index(ifindex)) == NULL)
+        if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
                 return -ENODEV;
 
         if ((idev = __in6_dev_get(dev)) == NULL)
@@ -2065,7 +2065,7 @@ static void sit_add_v4_addrs(struct inet6_dev *idev)
                 return;
         }
 
-        for_each_netdev(dev) {
+        for_each_netdev(&init_net, dev) {
                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
                 if (in_dev && (dev->flags & IFF_UP)) {
                         struct in_ifaddr * ifa;
@@ -2221,12 +2221,12 @@ static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
 
         /* first try to inherit the link-local address from the link device */
         if (idev->dev->iflink &&
-            (link_dev = __dev_get_by_index(idev->dev->iflink))) {
+            (link_dev = __dev_get_by_index(&init_net, idev->dev->iflink))) {
                 if (!ipv6_inherit_linklocal(idev, link_dev))
                         return;
         }
         /* then try to inherit it from any device */
-        for_each_netdev(link_dev) {
+        for_each_netdev(&init_net, link_dev) {
                 if (!ipv6_inherit_linklocal(idev, link_dev))
                         return;
         }
@@ -3084,7 +3084,7 @@ inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
                 valid_lft = INFINITY_LIFE_TIME;
         }
 
-        dev =  __dev_get_by_index(ifm->ifa_index);
+        dev =  __dev_get_by_index(&init_net, ifm->ifa_index);
         if (dev == NULL)
                 return -ENODEV;
 
@@ -3268,7 +3268,7 @@ static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
         s_ip_idx = ip_idx = cb->args[1];
 
         idx = 0;
-        for_each_netdev(dev) {
+        for_each_netdev(&init_net, dev) {
                 if (idx < s_idx)
                         goto cont;
                 if (idx > s_idx)
@@ -3377,7 +3377,7 @@ static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
 
         ifm = nlmsg_data(nlh);
         if (ifm->ifa_index)
-                dev = __dev_get_by_index(ifm->ifa_index);
+                dev = __dev_get_by_index(&init_net, ifm->ifa_index);
 
         if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) {
                 err = -EADDRNOTAVAIL;
@@ -3589,7 +3589,7 @@ static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
 
         read_lock(&dev_base_lock);
         idx = 0;
-        for_each_netdev(dev) {
+        for_each_netdev(&init_net, dev) {
                 if (idx < s_idx)
                         goto cont;
                 if ((idev = in6_dev_get(dev)) == NULL)
@@ -4266,7 +4266,7 @@ void __exit addrconf_cleanup(void)
          *      clean dev list.
          */
 
-        for_each_netdev(dev) {
+        for_each_netdev(&init_net, dev) {
                 if (__in6_dev_get(dev) == NULL)
                         continue;
                 addrconf_ifdown(dev, 1);