[IPV6] ADDRCONF: Support RFC3484 configurable address selection policy table.

Policy table is implemented as an RCU linear list since we do not expect
large list nor frequent updates.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 9 insertions, 31 deletions

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index e1e591bfbdca..a70cecf8fc8d 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -874,36 +874,6 @@ static inline int ipv6_saddr_preferred(int type)
         return 0;
 }
 
-/* static matching label */
-static inline int ipv6_addr_label(const struct in6_addr *addr, int type,
-                                  int ifindex)
-{
- /*
-  *     prefix (longest match)  label
-  *     -----------------------------
-  *     ::1/128                 0
-  *     ::/0                    1
-  *     2002::/16               2
-  *     ::/96                   3
-  *     ::ffff:0:0/96           4
-  *     fc00::/7                5
-  *     2001::/32               6
-  */
-        if (type & IPV6_ADDR_LOOPBACK)
-                return 0;
-        else if (type & IPV6_ADDR_COMPATv4)
-                return 3;
-        else if (type & IPV6_ADDR_MAPPED)
-                return 4;
-        else if (addr->s6_addr32[0] == htonl(0x20010000))
-                return 6;
-        else if (addr->s6_addr16[0] == htons(0x2002))
-                return 2;
-        else if ((addr->s6_addr[0] & 0xfe) == 0xfc)
-                return 5;
-        return 1;
-}
-
 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
                        struct in6_addr *daddr, struct in6_addr *saddr)
 {
@@ -4189,7 +4159,13 @@ EXPORT_SYMBOL(unregister_inet6addr_notifier);
 
 int __init addrconf_init(void)
 {
-        int err = 0;
+        int err;
+
+        if ((err = ipv6_addr_label_init()) < 0) {
+                printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
+                        err);
+                return err;
+        }
 
         /* The addrconf netdev notifier requires that loopback_dev
          * has it's ipv6 private information allocated and setup
@@ -4240,6 +4216,8 @@ int __init addrconf_init(void)
         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
 
+        ipv6_addr_label_rtnl_register();
+
 #ifdef CONFIG_SYSCTL
         addrconf_sysctl.sysctl_header =
                 register_sysctl_table(addrconf_sysctl.addrconf_root_dir);