include/net/ip6_tunnel.h

   1 #ifndef _NET_IP6_TUNNEL_H
   2 #define _NET_IP6_TUNNEL_H
   3
   4 #include <linux/ipv6.h>
   5 #include <linux/netdevice.h>
   6 #include <linux/ip6_tunnel.h>
   7
   8 #define IP6TUNNEL_ERR_TIMEO (30*HZ)
   9
  10 /* capable of sending packets */
  11 #define IP6_TNL_F_CAP_XMIT 0x10000
  12 /* capable of receiving packets */
  13 #define IP6_TNL_F_CAP_RCV 0x20000
  14 /* determine capability on a per-packet basis */
  15 #define IP6_TNL_F_CAP_PER_PACKET 0x40000
  16
  17 struct __ip6_tnl_parm {
  18         char name[IFNAMSIZ];    /* name of tunnel device */
  19         int link;               /* ifindex of underlying L2 interface */
  20         __u8 proto;             /* tunnel protocol */
  21         __u8 encap_limit;       /* encapsulation limit for tunnel */
  22         __u8 hop_limit;         /* hop limit for tunnel */
  23         __be32 flowinfo;        /* traffic class and flowlabel for tunnel */
  24         __u32 flags;            /* tunnel flags */
  25         struct in6_addr laddr;  /* local tunnel end-point address */
  26         struct in6_addr raddr;  /* remote tunnel end-point address */
  27
  28         __be16                  i_flags;
  29         __be16                  o_flags;
  30         __be32                  i_key;
  31         __be32                  o_key;
  32 };
  33
  34 /* IPv6 tunnel */
  35 struct ip6_tnl {
  36         struct ip6_tnl __rcu *next;     /* next tunnel in list */
  37         struct net_device *dev; /* virtual device associated with tunnel */
  38         struct __ip6_tnl_parm parms;    /* tunnel configuration parameters */
  39         struct flowi fl;        /* flowi template for xmit */
  40         struct dst_entry *dst_cache;    /* cached dst */
  41         u32 dst_cookie;
  42
  43         int err_count;
  44         unsigned long err_time;
  45
  46         /* These fields used only by GRE */
  47         __u32 i_seqno;  /* The last seen seqno  */
  48         __u32 o_seqno;  /* The last output seqno */
  49         int hlen;       /* Precalculated GRE header length */
  50         int mlink;
  51 };
  52
  53 /* Tunnel encapsulation limit destination sub-option */
  54
  55 struct ipv6_tlv_tnl_enc_lim {
  56         __u8 type;              /* type-code for option         */
  57         __u8 length;            /* option length                */
  58         __u8 encap_limit;       /* tunnel encapsulation limit   */
  59 } __packed;
  60
  61 struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t);
  62 void ip6_tnl_dst_reset(struct ip6_tnl *t);
  63 void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst);
  64 int ip6_tnl_rcv_ctl(struct ip6_tnl *t, const struct in6_addr *laddr,
  65                 const struct in6_addr *raddr);
  66 int ip6_tnl_xmit_ctl(struct ip6_tnl *t);
  67 __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw);
  68 __u32 ip6_tnl_get_cap(struct ip6_tnl *t, const struct in6_addr *laddr,
  69                              const struct in6_addr *raddr);
  70
  71 #endif