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/if_tunnel.h>
   7 #include <linux/ip6_tunnel.h>
   8 #include <net/ip_tunnels.h>
   9 #include <net/dst_cache.h>
  10
  11 #define IP6TUNNEL_ERR_TIMEO (30*HZ)
  12
  13 /* capable of sending packets */
  14 #define IP6_TNL_F_CAP_XMIT 0x10000
  15 /* capable of receiving packets */
  16 #define IP6_TNL_F_CAP_RCV 0x20000
  17 /* determine capability on a per-packet basis */
  18 #define IP6_TNL_F_CAP_PER_PACKET 0x40000
  19
  20 struct __ip6_tnl_parm {
  21         char name[IFNAMSIZ];    /* name of tunnel device */
  22         int link;               /* ifindex of underlying L2 interface */
  23         __u8 proto;             /* tunnel protocol */
  24         __u8 encap_limit;       /* encapsulation limit for tunnel */
  25         __u8 hop_limit;         /* hop limit for tunnel */
  26         __be32 flowinfo;        /* traffic class and flowlabel for tunnel */
  27         __u32 flags;            /* tunnel flags */
  28         struct in6_addr laddr;  /* local tunnel end-point address */
  29         struct in6_addr raddr;  /* remote tunnel end-point address */
  30
  31         __be16                  i_flags;
  32         __be16                  o_flags;
  33         __be32                  i_key;
  34         __be32                  o_key;
  35 };
  36
  37 /* IPv6 tunnel */
  38 struct ip6_tnl {
  39         struct ip6_tnl __rcu *next;     /* next tunnel in list */
  40         struct net_device *dev; /* virtual device associated with tunnel */
  41         struct net *net;        /* netns for packet i/o */
  42         struct __ip6_tnl_parm parms;    /* tunnel configuration parameters */
  43         struct flowi fl;        /* flowi template for xmit */
  44         struct dst_cache dst_cache;     /* cached dst */
  45
  46         int err_count;
  47         unsigned long err_time;
  48
  49         /* These fields used only by GRE */
  50         __u32 i_seqno;  /* The last seen seqno  */
  51         __u32 o_seqno;  /* The last output seqno */
  52         int hlen;       /* Precalculated GRE header length */
  53         int mlink;
  54 };
  55
  56 /* Tunnel encapsulation limit destination sub-option */
  57
  58 struct ipv6_tlv_tnl_enc_lim {
  59         __u8 type;              /* type-code for option         */
  60         __u8 length;            /* option length                */
  61         __u8 encap_limit;       /* tunnel encapsulation limit   */
  62 } __packed;
  63
  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, const struct in6_addr *laddr,
  67                      const struct in6_addr *raddr);
  68 __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw);
  69 __u32 ip6_tnl_get_cap(struct ip6_tnl *t, const struct in6_addr *laddr,
  70                              const struct in6_addr *raddr);
  71 struct net *ip6_tnl_get_link_net(const struct net_device *dev);
  72 int ip6_tnl_get_iflink(const struct net_device *dev);
  73
  74 #ifdef CONFIG_INET
  75 static inline void ip6tunnel_xmit(struct sock *sk, struct sk_buff *skb,
  76                                   struct net_device *dev)
  77 {
  78         int pkt_len, err;
  79
  80         pkt_len = skb->len - skb_inner_network_offset(skb);
  81         err = ip6_local_out(dev_net(skb_dst(skb)->dev), sk, skb);
  82         if (unlikely(net_xmit_eval(err)))
  83                 pkt_len = -1;
  84         iptunnel_xmit_stats(dev, pkt_len);
  85 }
  86 #endif
  87 #endif