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         bool collect_md;
  27         __be32 flowinfo;        /* traffic class and flowlabel for tunnel */
  28         __u32 flags;            /* tunnel flags */
  29         struct in6_addr laddr;  /* local tunnel end-point address */
  30         struct in6_addr raddr;  /* remote tunnel end-point address */
  31
  32         __be16                  i_flags;
  33         __be16                  o_flags;
  34         __be32                  i_key;
  35         __be32                  o_key;
  36 };
  37
  38 /* IPv6 tunnel */
  39 struct ip6_tnl {
  40         struct ip6_tnl __rcu *next;     /* next tunnel in list */
  41         struct net_device *dev; /* virtual device associated with tunnel */
  42         struct net *net;        /* netns for packet i/o */
  43         struct __ip6_tnl_parm parms;    /* tunnel configuration parameters */
  44         struct flowi fl;        /* flowi template for xmit */
  45         struct dst_cache dst_cache;     /* cached dst */
  46         struct gro_cells gro_cells;
  47
  48         int err_count;
  49         unsigned long err_time;
  50
  51         /* These fields used only by GRE */
  52         __u32 i_seqno;  /* The last seen seqno  */
  53         __u32 o_seqno;  /* The last output seqno */
  54         int hlen;       /* tun_hlen + encap_hlen */
  55         int tun_hlen;   /* Precalculated header length */
  56         int encap_hlen; /* Encap header length (FOU,GUE) */
  57         struct ip_tunnel_encap encap;
  58         int mlink;
  59 };
  60
  61 struct ip6_tnl_encap_ops {
  62         size_t (*encap_hlen)(struct ip_tunnel_encap *e);
  63         int (*build_header)(struct sk_buff *skb, struct ip_tunnel_encap *e,
  64                             u8 *protocol, struct flowi6 *fl6);
  65 };
  66
  67 #ifdef CONFIG_INET
  68
  69 extern const struct ip6_tnl_encap_ops __rcu *
  70                 ip6tun_encaps[MAX_IPTUN_ENCAP_OPS];
  71
  72 int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops,
  73                           unsigned int num);
  74 int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops,
  75                           unsigned int num);
  76 int ip6_tnl_encap_setup(struct ip6_tnl *t,
  77                         struct ip_tunnel_encap *ipencap);
  78
  79 static inline int ip6_encap_hlen(struct ip_tunnel_encap *e)
  80 {
  81         const struct ip6_tnl_encap_ops *ops;
  82         int hlen = -EINVAL;
  83
  84         if (e->type == TUNNEL_ENCAP_NONE)
  85                 return 0;
  86
  87         if (e->type >= MAX_IPTUN_ENCAP_OPS)
  88                 return -EINVAL;
  89
  90         rcu_read_lock();
  91         ops = rcu_dereference(ip6tun_encaps[e->type]);
  92         if (likely(ops && ops->encap_hlen))
  93                 hlen = ops->encap_hlen(e);
  94         rcu_read_unlock();
  95
  96         return hlen;
  97 }
  98
  99 static inline int ip6_tnl_encap(struct sk_buff *skb, struct ip6_tnl *t,
 100                                 u8 *protocol, struct flowi6 *fl6)
 101 {
 102         const struct ip6_tnl_encap_ops *ops;
 103         int ret = -EINVAL;
 104
 105         if (t->encap.type == TUNNEL_ENCAP_NONE)
 106                 return 0;
 107
 108         if (t->encap.type >= MAX_IPTUN_ENCAP_OPS)
 109                 return -EINVAL;
 110
 111         rcu_read_lock();
 112         ops = rcu_dereference(ip6tun_encaps[t->encap.type]);
 113         if (likely(ops && ops->build_header))
 114                 ret = ops->build_header(skb, &t->encap, protocol, fl6);
 115         rcu_read_unlock();
 116
 117         return ret;
 118 }
 119
 120 /* Tunnel encapsulation limit destination sub-option */
 121
 122 struct ipv6_tlv_tnl_enc_lim {
 123         __u8 type;              /* type-code for option         */
 124         __u8 length;            /* option length                */
 125         __u8 encap_limit;       /* tunnel encapsulation limit   */
 126 } __packed;
 127
 128 int ip6_tnl_rcv_ctl(struct ip6_tnl *t, const struct in6_addr *laddr,
 129                 const struct in6_addr *raddr);
 130 int ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb,
 131                 const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst,
 132                 bool log_ecn_error);
 133 int ip6_tnl_xmit_ctl(struct ip6_tnl *t, const struct in6_addr *laddr,
 134                      const struct in6_addr *raddr);
 135 int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield,
 136                  struct flowi6 *fl6, int encap_limit, __u32 *pmtu, __u8 proto);
 137 __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw);
 138 __u32 ip6_tnl_get_cap(struct ip6_tnl *t, const struct in6_addr *laddr,
 139                              const struct in6_addr *raddr);
 140 struct net *ip6_tnl_get_link_net(const struct net_device *dev);
 141 int ip6_tnl_get_iflink(const struct net_device *dev);
 142 int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu);
 143
 144 static inline void ip6tunnel_xmit(struct sock *sk, struct sk_buff *skb,
 145                                   struct net_device *dev)
 146 {
 147         int pkt_len, err;
 148
 149         memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
 150         pkt_len = skb->len - skb_inner_network_offset(skb);
 151         err = ip6_local_out(dev_net(skb_dst(skb)->dev), sk, skb);
 152         if (unlikely(net_xmit_eval(err)))
 153                 pkt_len = -1;
 154         iptunnel_xmit_stats(dev, pkt_len);
 155 }
 156 #endif
 157 #endif