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
   9 #define IP6TUNNEL_ERR_TIMEO (30*HZ)
  10
  11 /* capable of sending packets */
  12 #define IP6_TNL_F_CAP_XMIT 0x10000
  13 /* capable of receiving packets */
  14 #define IP6_TNL_F_CAP_RCV 0x20000
  15 /* determine capability on a per-packet basis */
  16 #define IP6_TNL_F_CAP_PER_PACKET 0x40000
  17
  18 struct __ip6_tnl_parm {
  19         char name[IFNAMSIZ];    /* name of tunnel device */
  20         int link;               /* ifindex of underlying L2 interface */
  21         __u8 proto;             /* tunnel protocol */
  22         __u8 encap_limit;       /* encapsulation limit for tunnel */
  23         __u8 hop_limit;         /* hop limit for tunnel */
  24         __be32 flowinfo;        /* traffic class and flowlabel for tunnel */
  25         __u32 flags;            /* tunnel flags */
  26         struct in6_addr laddr;  /* local tunnel end-point address */
  27         struct in6_addr raddr;  /* remote tunnel end-point address */
  28
  29         __be16                  i_flags;
  30         __be16                  o_flags;
  31         __be32                  i_key;
  32         __be32                  o_key;
  33 };
  34
  35 struct ip6_tnl_dst {
  36         seqlock_t lock;
  37         struct dst_entry __rcu *dst;
  38         u32 cookie;
  39 };
  40
  41 /* IPv6 tunnel */
  42 struct ip6_tnl {
  43         struct ip6_tnl __rcu *next;     /* next tunnel in list */
  44         struct net_device *dev; /* virtual device associated with tunnel */
  45         struct net *net;        /* netns for packet i/o */
  46         struct __ip6_tnl_parm parms;    /* tunnel configuration parameters */
  47         struct flowi fl;        /* flowi template for xmit */
  48         struct ip6_tnl_dst __percpu *dst_cache; /* cached dst */
  49
  50         int err_count;
  51         unsigned long err_time;
  52
  53         /* These fields used only by GRE */
  54         __u32 i_seqno;  /* The last seen seqno  */
  55         __u32 o_seqno;  /* The last output seqno */
  56         int hlen;       /* Precalculated GRE header length */
  57         int mlink;
  58 };
  59
  60 /* Tunnel encapsulation limit destination sub-option */
  61
  62 struct ipv6_tlv_tnl_enc_lim {
  63         __u8 type;              /* type-code for option         */
  64         __u8 length;            /* option length                */
  65         __u8 encap_limit;       /* tunnel encapsulation limit   */
  66 } __packed;
  67
  68 struct dst_entry *ip6_tnl_dst_get(struct ip6_tnl *t);
  69 int ip6_tnl_dst_init(struct ip6_tnl *t);
  70 void ip6_tnl_dst_destroy(struct ip6_tnl *t);
  71 void ip6_tnl_dst_reset(struct ip6_tnl *t);
  72 void ip6_tnl_dst_set(struct ip6_tnl *t, struct dst_entry *dst);
  73 int ip6_tnl_rcv_ctl(struct ip6_tnl *t, const struct in6_addr *laddr,
  74                 const struct in6_addr *raddr);
  75 int ip6_tnl_xmit_ctl(struct ip6_tnl *t, const struct in6_addr *laddr,
  76                      const struct in6_addr *raddr);
  77 __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw);
  78 __u32 ip6_tnl_get_cap(struct ip6_tnl *t, const struct in6_addr *laddr,
  79                              const struct in6_addr *raddr);
  80 struct net *ip6_tnl_get_link_net(const struct net_device *dev);
  81 int ip6_tnl_get_iflink(const struct net_device *dev);
  82
  83 static inline void ip6tunnel_xmit(struct sock *sk, struct sk_buff *skb,
  84                                   struct net_device *dev)
  85 {
  86         struct net_device_stats *stats = &dev->stats;
  87         int pkt_len, err;
  88
  89         memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
  90         pkt_len = skb->len - skb_inner_network_offset(skb);
  91         err = ip6_local_out(dev_net(skb_dst(skb)->dev), sk, skb);
  92
  93         if (net_xmit_eval(err) == 0) {
  94                 struct pcpu_sw_netstats *tstats = get_cpu_ptr(dev->tstats);
  95                 u64_stats_update_begin(&tstats->syncp);
  96                 tstats->tx_bytes += pkt_len;
  97                 tstats->tx_packets++;
  98                 u64_stats_update_end(&tstats->syncp);
  99                 put_cpu_ptr(tstats);
 100         } else {
 101                 stats->tx_errors++;
 102                 stats->tx_aborted_errors++;
 103         }
 104 }
 105 #endif