[IPV6]: Make ipv6_addr_type() more generic so that we can use it for source address...
YOSHIFUJI Hideaki [Tue, 8 Nov 2005 17:38:12 +0000 (09:38 -0800)]
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/ipv6.h
net/ipv6/addrconf.c
net/ipv6/ipv6_syms.c

index 98661fa..6addb4d 100644 (file)
@@ -252,12 +252,25 @@ typedef int               (*inet_getfrag_t) (const void *data,
                                           char *,
                                           unsigned int, unsigned int);
 
-
-extern int             ipv6_addr_type(const struct in6_addr *addr);
+extern int __ipv6_addr_type(const struct in6_addr *addr);
+static inline int ipv6_addr_type(const struct in6_addr *addr)
+{
+       return __ipv6_addr_type(addr) & 0xffff;
+}
 
 static inline int ipv6_addr_scope(const struct in6_addr *addr)
 {
-       return ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
+       return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
+}
+
+static inline int __ipv6_addr_src_scope(int type)
+{
+       return (type == IPV6_ADDR_ANY ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16));
+}
+
+static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
+{
+       return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
 }
 
 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
index 2c5f572..ff895da 100644 (file)
@@ -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)
index 37a4a99..1648278 100644 (file)
@@ -7,7 +7,7 @@
 #include <net/ip6_route.h>
 #include <net/xfrm.h>
 
-EXPORT_SYMBOL(ipv6_addr_type);
+EXPORT_SYMBOL(__ipv6_addr_type);
 EXPORT_SYMBOL(icmpv6_send);
 EXPORT_SYMBOL(icmpv6_statistics);
 EXPORT_SYMBOL(icmpv6_err_convert);