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 struct gro_cells gro_cells; 46 47 int err_count; 48 unsigned long err_time; 49 50 /* These fields used only by GRE */ 51 __u32 i_seqno; /* The last seen seqno */ 52 __u32 o_seqno; /* The last output seqno */ 53 int hlen; /* tun_hlen + encap_hlen */ 54 int tun_hlen; /* Precalculated header length */ 55 int encap_hlen; /* Encap header length (FOU,GUE) */ 56 struct ip_tunnel_encap encap; 57 int mlink; 58 }; 59 60 struct ip6_tnl_encap_ops { 61 size_t (*encap_hlen)(struct ip_tunnel_encap *e); 62 int (*build_header)(struct sk_buff *skb, struct ip_tunnel_encap *e, 63 u8 *protocol, struct flowi6 *fl6); 64 }; 65 66 extern const struct ip6_tnl_encap_ops __rcu * 67 ip6tun_encaps[MAX_IPTUN_ENCAP_OPS]; 68 69 int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops, 70 unsigned int num); 71 int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops, 72 unsigned int num); 73 int ip6_tnl_encap_setup(struct ip6_tnl *t, 74 struct ip_tunnel_encap *ipencap); 75 76 static inline int ip6_encap_hlen(struct ip_tunnel_encap *e) 77 { 78 const struct ip6_tnl_encap_ops *ops; 79 int hlen = -EINVAL; 80 81 if (e->type == TUNNEL_ENCAP_NONE) 82 return 0; 83 84 if (e->type >= MAX_IPTUN_ENCAP_OPS) 85 return -EINVAL; 86 87 rcu_read_lock(); 88 ops = rcu_dereference(ip6tun_encaps[e->type]); 89 if (likely(ops && ops->encap_hlen)) 90 hlen = ops->encap_hlen(e); 91 rcu_read_unlock(); 92 93 return hlen; 94 } 95 96 static inline int ip6_tnl_encap(struct sk_buff *skb, struct ip6_tnl *t, 97 u8 *protocol, struct flowi6 *fl6) 98 { 99 const struct ip6_tnl_encap_ops *ops; 100 int ret = -EINVAL; 101 102 if (t->encap.type == TUNNEL_ENCAP_NONE) 103 return 0; 104 105 if (t->encap.type >= MAX_IPTUN_ENCAP_OPS) 106 return -EINVAL; 107 108 rcu_read_lock(); 109 ops = rcu_dereference(ip6tun_encaps[t->encap.type]); 110 if (likely(ops && ops->build_header)) 111 ret = ops->build_header(skb, &t->encap, protocol, fl6); 112 rcu_read_unlock(); 113 114 return ret; 115 } 116 117 /* Tunnel encapsulation limit destination sub-option */ 118 119 struct ipv6_tlv_tnl_enc_lim { 120 __u8 type; /* type-code for option */ 121 __u8 length; /* option length */ 122 __u8 encap_limit; /* tunnel encapsulation limit */ 123 } __packed; 124 125 int ip6_tnl_rcv_ctl(struct ip6_tnl *t, const struct in6_addr *laddr, 126 const struct in6_addr *raddr); 127 int ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb, 128 const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst, 129 bool log_ecn_error); 130 int ip6_tnl_xmit_ctl(struct ip6_tnl *t, const struct in6_addr *laddr, 131 const struct in6_addr *raddr); 132 int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield, 133 struct flowi6 *fl6, int encap_limit, __u32 *pmtu, __u8 proto); 134 __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw); 135 __u32 ip6_tnl_get_cap(struct ip6_tnl *t, const struct in6_addr *laddr, 136 const struct in6_addr *raddr); 137 struct net *ip6_tnl_get_link_net(const struct net_device *dev); 138 int ip6_tnl_get_iflink(const struct net_device *dev); 139 int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu); 140 141 #ifdef CONFIG_INET 142 static inline void ip6tunnel_xmit(struct sock *sk, struct sk_buff *skb, 143 struct net_device *dev) 144 { 145 int pkt_len, err; 146 147 pkt_len = skb->len - skb_inner_network_offset(skb); 148 err = ip6_local_out(dev_net(skb_dst(skb)->dev), sk, skb); 149 if (unlikely(net_xmit_eval(err))) 150 pkt_len = -1; 151 iptunnel_xmit_stats(dev, pkt_len); 152 } 153 #endif 154 #endif 155