[IPV6]: ROUTE: Add experimental support for Route Information Option in RA (RFC4191).

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

3 files changed, 25 insertions, 0 deletions

diff --git a/include/linux/ipv6_route.h b/include/linux/ipv6_route.h
index f4b085c91608..b323ff577967 100644
--- a/include/linux/ipv6_route.h
+++ b/include/linux/ipv6_route.h
@@ -23,6 +23,8 @@
 #define RTF_NONEXTHOP   0x00200000      /* route with no nexthop        */
 #define RTF_EXPIRES     0x00400000
 
+#define RTF_ROUTEINFO   0x00800000      /* route information - RA       */
+
 #define RTF_CACHE       0x01000000      /* cache entry                  */
 #define RTF_FLOW        0x02000000      /* flow significant route       */
 #define RTF_POLICY      0x04000000      /* policy route                 */
diff --git a/include/net/ip6_route.h b/include/net/ip6_route.h
index 50161322b828..a398ae5e30f9 100644
--- a/include/net/ip6_route.h
+++ b/include/net/ip6_route.h
@@ -7,6 +7,23 @@
 #define IP6_RT_PRIO_KERN        512
 #define IP6_RT_FLOW_MASK        0x00ff
 
+struct route_info {
+        __u8                    type;
+        __u8                    length;
+        __u8                    prefix_len;
+#if defined(__BIG_ENDIAN_BITFIELD)
+        __u8                    reserved_h:3,
+                                route_pref:2,
+                                reserved_l:3;
+#elif defined(__LITTLE_ENDIAN_BITFIELD)
+        __u8                    reserved_l:3,
+                                route_pref:2,
+                                reserved_h:3;
+#endif
+        __u32                   lifetime;
+        __u8                    prefix[0];      /* 0,8 or 16 */
+};
+
 #ifdef __KERNEL__
 
 #include <net/flow.h>
@@ -92,6 +109,10 @@ extern struct rt6_info *	rt6_add_dflt_router(struct in6_addr *gwaddr,
 
 extern void                     rt6_purge_dflt_routers(void);
 
+extern int                      rt6_route_rcv(struct net_device *dev,
+                                              u8 *opt, int len,
+                                              struct in6_addr *gwaddr);
+
 extern void                     rt6_redirect(struct in6_addr *dest,
                                              struct in6_addr *saddr,
                                              struct neighbour *neigh,
diff --git a/include/net/ndisc.h b/include/net/ndisc.h
index bbac87eeb422..91fa271a0064 100644
--- a/include/net/ndisc.h
+++ b/include/net/ndisc.h
@@ -22,6 +22,8 @@ enum {
         ND_OPT_PREFIX_INFO = 3,         /* RFC2461 */
         ND_OPT_REDIRECT_HDR = 4,        /* RFC2461 */
         ND_OPT_MTU = 5,                 /* RFC2461 */
+        __ND_OPT_ARRAY_MAX,
+        ND_OPT_ROUTE_INFO = 24,         /* RFC4191 */
         __ND_OPT_MAX
 };