[IPV6]: Make ipv6_addr_type() more generic so that we can use it for source address selection.

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

1 files changed, 47 insertions, 43 deletions

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 2c5f57299d63..ff895da6395b 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -35,6 +35,9 @@
  *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
  *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
  *                                              seq_file.
+ *      YOSHIFUJI Hideaki @USAGI        :       improved source address
+ *                                              selection; consider scope,
+ *                                              status etc.
  */
 
 #include <linux/config.h>
@@ -193,46 +196,51 @@ const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
 #endif
 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
 
-int ipv6_addr_type(const struct in6_addr *addr)
+#define IPV6_ADDR_SCOPE_TYPE(scope)     ((scope) << 16)
+
+static inline unsigned ipv6_addr_scope2type(unsigned scope)
+{
+        switch(scope) {
+        case IPV6_ADDR_SCOPE_NODELOCAL:
+                return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) |
+                        IPV6_ADDR_LOOPBACK);
+        case IPV6_ADDR_SCOPE_LINKLOCAL:
+                return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) |
+                        IPV6_ADDR_LINKLOCAL);
+        case IPV6_ADDR_SCOPE_SITELOCAL:
+                return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) |
+                        IPV6_ADDR_SITELOCAL);
+        }
+        return IPV6_ADDR_SCOPE_TYPE(scope);
+}
+
+int __ipv6_addr_type(const struct in6_addr *addr)
 {
-        int type;
         u32 st;
 
         st = addr->s6_addr32[0];
 
-        if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {
-                type = IPV6_ADDR_MULTICAST;
-
-                switch((st & htonl(0x00FF0000))) {
-                        case __constant_htonl(0x00010000):
-                                type |= IPV6_ADDR_LOOPBACK;
-                                break;
-
-                        case __constant_htonl(0x00020000):
-                                type |= IPV6_ADDR_LINKLOCAL;
-                                break;
-
-                        case __constant_htonl(0x00050000):
-                                type |= IPV6_ADDR_SITELOCAL;
-                                break;
-                };
-                return type;
-        }
-
-        type = IPV6_ADDR_UNICAST;
-
         /* Consider all addresses with the first three bits different of
-           000 and 111 as finished.
+           000 and 111 as unicasts.
          */
         if ((st & htonl(0xE0000000)) != htonl(0x00000000) &&
             (st & htonl(0xE0000000)) != htonl(0xE0000000))
-                return type;
-        
-        if ((st & htonl(0xFFC00000)) == htonl(0xFE800000))
-                return (IPV6_ADDR_LINKLOCAL | type);
+                return (IPV6_ADDR_UNICAST | 
+                        IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));
 
+        if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {
+                /* multicast */
+                /* addr-select 3.1 */
+                return (IPV6_ADDR_MULTICAST |
+                        ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr)));
+        }
+
+        if ((st & htonl(0xFFC00000)) == htonl(0xFE800000))
+                return (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST | 
+                        IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL));               /* addr-select 3.1 */
         if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000))
-                return (IPV6_ADDR_SITELOCAL | type);
+                return (IPV6_ADDR_SITELOCAL | IPV6_ADDR_UNICAST |
+                        IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL));               /* addr-select 3.1 */
 
         if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) {
                 if (addr->s6_addr32[2] == 0) {
@@ -240,24 +248,20 @@ int ipv6_addr_type(const struct in6_addr *addr)
                                 return IPV6_ADDR_ANY;
 
                         if (addr->s6_addr32[3] == htonl(0x00000001))
-                                return (IPV6_ADDR_LOOPBACK | type);
+                                return (IPV6_ADDR_LOOPBACK | IPV6_ADDR_UNICAST |
+                                        IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL));       /* addr-select 3.4 */
 
-                        return (IPV6_ADDR_COMPATv4 | type);
+                        return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST |
+                                IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.3 */
                 }
 
                 if (addr->s6_addr32[2] == htonl(0x0000ffff))
-                        return IPV6_ADDR_MAPPED;
-        }
-
-        st &= htonl(0xFF000000);
-        if (st == 0)
-                return IPV6_ADDR_RESERVED;
-        st &= htonl(0xFE000000);
-        if (st == htonl(0x02000000))
-                return IPV6_ADDR_RESERVED;      /* for NSAP */
-        if (st == htonl(0x04000000))
-                return IPV6_ADDR_RESERVED;      /* for IPX */
-        return type;
+                        return (IPV6_ADDR_MAPPED | 
+                                IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.3 */
+        }
+
+        return (IPV6_ADDR_RESERVED | 
+                IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.4 */
 }
 
 static void addrconf_del_timer(struct inet6_ifaddr *ifp)