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
  10 #define IP6TUNNEL_ERR_TIMEO (30*HZ)
  11
  12 /* capable of sending packets */
  13 #define IP6_TNL_F_CAP_XMIT 0x10000
  14 /* capable of receiving packets */
  15 #define IP6_TNL_F_CAP_RCV 0x20000
  16 /* determine capability on a per-packet basis */
  17 #define IP6_TNL_F_CAP_PER_PACKET 0x40000
  18
  19 struct __ip6_tnl_parm {
  20         char name[IFNAMSIZ];    /* name of tunnel device */
  21         int link;               /* ifindex of underlying L2 interface */
  22         __u8 proto;             /* tunnel protocol */
  23         __u8 encap_limit;       /* encapsulation limit for tunnel */
  24         __u8 hop_limit;         /* hop limit for tunnel */
  25         __be32 flowinfo;        /* traffic class and flowlabel for tunnel */
  26         __u32 flags;            /* tunnel flags */
  27         struct in6_addr laddr;  /* local tunnel end-point address */
  28         struct in6_addr raddr;  /* remote tunnel end-point address */
  29
  30         __be16                  i_flags;
  31         __be16                  o_flags;
  32         __be32                  i_key;
  33         __be32                  o_key;
  34 };
  35
  36 struct ip6_tnl_dst {
  37         seqlock_t lock;
  38         struct dst_entry __rcu *dst;
  39         u32 cookie;
  40 };
  41
  42 /* IPv6 tunnel */
  43 struct ip6_tnl {
  44         struct ip6_tnl __rcu *next;     /* next tunnel in list */
  45         struct net_device *dev; /* virtual device associated with tunnel */
  46         struct net *net;        /* netns for packet i/o */
  47         struct __ip6_tnl_parm parms;    /* tunnel configuration parameters */
  48         struct flowi fl;        /* flowi template for xmit */
  49         struct ip6_tnl_dst __percpu *dst_cache; /* cached dst */
  50
  51         int err_count;
  52         unsigned long err_time;
  53
  54         /* These fields used only by GRE */
  55         __u32 i_seqno;  /* The last seen seqno  */
  56         __u32 o_seqno;  /* The last output seqno */
  57         int hlen;       /* Precalculated GRE header length */
  58         int mlink;
  59 };
  60
  61 /* Tunnel encapsulation limit destination sub-option */
  62
  63 struct ipv6_tlv_tnl_enc_lim {
  64         __u8 type;              /* type-code for option         */
  65         __u8 length;            /* option length                */
  66         __u8 encap_limit;       /* tunnel encapsulation limit   */
  67 } __packed;
  68
  69 struct dst_entry *ip6_tnl_dst_get(struct ip6_tnl *t);
  70 int ip6_tnl_dst_init(struct ip6_tnl *t);
  71 void ip6_tnl_dst_destroy(struct ip6_tnl *t);
  72 void ip6_tnl_dst_reset(struct ip6_tnl *t);
  73 void ip6_tnl_dst_set(struct ip6_tnl *t, struct dst_entry *dst);
  74 int ip6_tnl_rcv_ctl(struct ip6_tnl *t, const struct in6_addr *laddr,
  75                 const struct in6_addr *raddr);
  76 int ip6_tnl_xmit_ctl(struct ip6_tnl *t, const struct in6_addr *laddr,
  77                      const struct in6_addr *raddr);
  78 __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw);
  79 __u32 ip6_tnl_get_cap(struct ip6_tnl *t, const struct in6_addr *laddr,
  80                              const struct in6_addr *raddr);
  81 struct net *ip6_tnl_get_link_net(const struct net_device *dev);
  82 int ip6_tnl_get_iflink(const struct net_device *dev);
  83
  84 #ifdef CONFIG_INET
  85 static inline void ip6tunnel_xmit(struct sock *sk, struct sk_buff *skb,
  86                                   struct net_device *dev)
  87 {
  88         int pkt_len, err;
  89
  90         pkt_len = skb->len - skb_inner_network_offset(skb);
  91         err = ip6_local_out(dev_net(skb_dst(skb)->dev), sk, skb);
  92         if (unlikely(net_xmit_eval(err)))
  93                 pkt_len = -1;
  94         iptunnel_xmit_stats(dev, pkt_len);
  95 }
  96 #endif
  97 #endif