gre: Support GRE over IPv6

GRE over IPv6 implementation.

Signed-off-by: Dmitry Kozlov <xeb@mail.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 39 insertions, 2 deletions

diff --git a/include/net/ip6_tunnel.h b/include/net/ip6_tunnel.h
index 358fb86f57eb..e03047f7090b 100644
--- a/include/net/ip6_tunnel.h
+++ b/include/net/ip6_tunnel.h
@@ -5,6 +5,8 @@
 #include <linux/netdevice.h>
 #include <linux/ip6_tunnel.h>
 
+#define IP6TUNNEL_ERR_TIMEO (30*HZ)
+
 /* capable of sending packets */
 #define IP6_TNL_F_CAP_XMIT 0x10000
 /* capable of receiving packets */
@@ -12,15 +14,40 @@
 /* determine capability on a per-packet basis */
 #define IP6_TNL_F_CAP_PER_PACKET 0x40000
 
-/* IPv6 tunnel */
+struct __ip6_tnl_parm {
+        char name[IFNAMSIZ];    /* name of tunnel device */
+        int link;               /* ifindex of underlying L2 interface */
+        __u8 proto;             /* tunnel protocol */
+        __u8 encap_limit;       /* encapsulation limit for tunnel */
+        __u8 hop_limit;         /* hop limit for tunnel */
+        __be32 flowinfo;        /* traffic class and flowlabel for tunnel */
+        __u32 flags;            /* tunnel flags */
+        struct in6_addr laddr;  /* local tunnel end-point address */
+        struct in6_addr raddr;  /* remote tunnel end-point address */
+
+        __be16                  i_flags;
+        __be16                  o_flags;
+        __be32                  i_key;
+        __be32                  o_key;
+};
 
+/* IPv6 tunnel */
 struct ip6_tnl {
         struct ip6_tnl __rcu *next;     /* next tunnel in list */
         struct net_device *dev; /* virtual device associated with tunnel */
-        struct ip6_tnl_parm parms;      /* tunnel configuration parameters */
+        struct __ip6_tnl_parm parms;    /* tunnel configuration parameters */
         struct flowi fl;        /* flowi template for xmit */
         struct dst_entry *dst_cache;    /* cached dst */
         u32 dst_cookie;
+
+        int err_count;
+        unsigned long err_time;
+
+        /* These fields used only by GRE */
+        __u32 i_seqno;  /* The last seen seqno  */
+        __u32 o_seqno;  /* The last output seqno */
+        int hlen;       /* Precalculated GRE header length */
+        int mlink;
 };
 
 /* Tunnel encapsulation limit destination sub-option */
@@ -31,4 +58,14 @@ struct ipv6_tlv_tnl_enc_lim {
         __u8 encap_limit;       /* tunnel encapsulation limit   */
 } __packed;
 
+struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t);
+void ip6_tnl_dst_reset(struct ip6_tnl *t);
+void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst);
+int ip6_tnl_rcv_ctl(struct ip6_tnl *t, const struct in6_addr *laddr,
+                const struct in6_addr *raddr);
+int ip6_tnl_xmit_ctl(struct ip6_tnl *t);
+__u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw);
+__u32 ip6_tnl_get_cap(struct ip6_tnl *t, const struct in6_addr *laddr,
+                             const struct in6_addr *raddr);
+
 #endif