[IPV6] SIT: Add PRL management for ISATAP.

This patch updates the Linux the Intra-Site Automatic Tunnel Addressing
Protocol (ISATAP) implementation. It places the ISATAP potential router
list (PRL) in the kernel and adds three new private ioctls for PRL
management.

[Add several changes of structure name, constant names etc. - yoshfuji]

Signed-off-by: Fred L. Templin <fred.l.templin@boeing.com>
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>

4 files changed, 33 insertions, 4 deletions

diff --git a/include/linux/if_tunnel.h b/include/linux/if_tunnel.h
index 228eb4eb3129..f20c224d544c 100644
--- a/include/linux/if_tunnel.h
+++ b/include/linux/if_tunnel.h
@@ -7,6 +7,9 @@
 #define SIOCADDTUNNEL   (SIOCDEVPRIVATE + 1)
 #define SIOCDELTUNNEL   (SIOCDEVPRIVATE + 2)
 #define SIOCCHGTUNNEL   (SIOCDEVPRIVATE + 3)
+#define SIOCADDPRL      (SIOCDEVPRIVATE + 5)
+#define SIOCDELPRL      (SIOCDEVPRIVATE + 6)
+#define SIOCCHGPRL      (SIOCDEVPRIVATE + 7)
 
 #define GRE_CSUM        __constant_htons(0x8000)
 #define GRE_ROUTING     __constant_htons(0x4000)
@@ -17,9 +20,6 @@
 #define GRE_FLAGS       __constant_htons(0x00F8)
 #define GRE_VERSION     __constant_htons(0x0007)
 
-/* i_flags values for SIT mode */
-#define SIT_ISATAP      0x0001
-
 struct ip_tunnel_parm
 {
         char                    name[IFNAMSIZ];
@@ -31,4 +31,16 @@ struct ip_tunnel_parm
         struct iphdr            iph;
 };
 
+/* SIT-mode i_flags */
+#define SIT_ISATAP      0x0001
+
+struct ip_tunnel_prl {
+        __be32                  addr;
+        __u16                   flags;
+        __u16                   __reserved;
+};
+
+/* PRL flags */
+#define PRL_DEFAULT             0x0001
+
 #endif /* _IF_TUNNEL_H_ */
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index ff72145d5d9e..e10e55c9b081 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -313,7 +313,8 @@ struct sk_buff {
         __u16                   tc_verd;        /* traffic control verdict */
 #endif
 #endif
-        /* 2 byte hole */
+        __u8                    ndisc_nodetype:2;
+        /* 14 bit hole */
 
 #ifdef CONFIG_NET_DMA
         dma_cookie_t            dma_cookie;
diff --git a/include/net/ipip.h b/include/net/ipip.h
index 549e132bca9c..205536a014e8 100644
--- a/include/net/ipip.h
+++ b/include/net/ipip.h
@@ -24,6 +24,13 @@ struct ip_tunnel
         int                     mlink;
 
         struct ip_tunnel_parm   parms;
+        struct ip_tunnel_prl_entry      *prl;           /* potential router list */
+};
+
+struct ip_tunnel_prl_entry
+{
+        struct ip_tunnel_prl_entry      *next;
+        struct ip_tunnel_prl            entry;
 };
 
 #define IPTUNNEL_XMIT() do {                                            \
diff --git a/include/net/ndisc.h b/include/net/ndisc.h
index 5aedf324de66..9f2bae68d28c 100644
--- a/include/net/ndisc.h
+++ b/include/net/ndisc.h
@@ -12,6 +12,15 @@
 #define NDISC_REDIRECT                  137
 
 /*
+ * Router type: cross-layer information from link-layer to
+ * IPv6 layer reported by certain link types (e.g., RFC4214).
+ */
+#define NDISC_NODETYPE_UNSPEC           0       /* unspecified (default) */
+#define NDISC_NODETYPE_HOST             1       /* host or unauthorized router */
+#define NDISC_NODETYPE_NODEFAULT        2       /* non-default router */
+#define NDISC_NODETYPE_DEFAULT          3       /* default router */
+
+/*
  *      ndisc options
  */