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 #ifdef CONFIG_INET 67 68 extern const struct ip6_tnl_encap_ops __rcu * 69 ip6tun_encaps[MAX_IPTUN_ENCAP_OPS]; 70 71 int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops, 72 unsigned int num); 73 int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops, 74 unsigned int num); 75 int ip6_tnl_encap_setup(struct ip6_tnl *t, 76 struct ip_tunnel_encap *ipencap); 77 78 static inline int ip6_encap_hlen(struct ip_tunnel_encap *e) 79 { 80 const struct ip6_tnl_encap_ops *ops; 81 int hlen = -EINVAL; 82 83 if (e->type == TUNNEL_ENCAP_NONE) 84 return 0; 85 86 if (e->type >= MAX_IPTUN_ENCAP_OPS) 87 return -EINVAL; 88 89 rcu_read_lock(); 90 ops = rcu_dereference(ip6tun_encaps[e->type]); 91 if (likely(ops && ops->encap_hlen)) 92 hlen = ops->encap_hlen(e); 93 rcu_read_unlock(); 94 95 return hlen; 96 } 97 98 static inline int ip6_tnl_encap(struct sk_buff *skb, struct ip6_tnl *t, 99 u8 *protocol, struct flowi6 *fl6) 100 { 101 const struct ip6_tnl_encap_ops *ops; 102 int ret = -EINVAL; 103 104 if (t->encap.type == TUNNEL_ENCAP_NONE) 105 return 0; 106 107 if (t->encap.type >= MAX_IPTUN_ENCAP_OPS) 108 return -EINVAL; 109 110 rcu_read_lock(); 111 ops = rcu_dereference(ip6tun_encaps[t->encap.type]); 112 if (likely(ops && ops->build_header)) 113 ret = ops->build_header(skb, &t->encap, protocol, fl6); 114 rcu_read_unlock(); 115 116 return ret; 117 } 118 119 /* Tunnel encapsulation limit destination sub-option */ 120 121 struct ipv6_tlv_tnl_enc_lim { 122 __u8 type; /* type-code for option */ 123 __u8 length; /* option length */ 124 __u8 encap_limit; /* tunnel encapsulation limit */ 125 } __packed; 126 127 int ip6_tnl_rcv_ctl(struct ip6_tnl *t, const struct in6_addr *laddr, 128 const struct in6_addr *raddr); 129 int ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb, 130 const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst, 131 bool log_ecn_error); 132 int ip6_tnl_xmit_ctl(struct ip6_tnl *t, const struct in6_addr *laddr, 133 const struct in6_addr *raddr); 134 int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield, 135 struct flowi6 *fl6, int encap_limit, __u32 *pmtu, __u8 proto); 136 __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw); 137 __u32 ip6_tnl_get_cap(struct ip6_tnl *t, const struct in6_addr *laddr, 138 const struct in6_addr *raddr); 139 struct net *ip6_tnl_get_link_net(const struct net_device *dev); 140 int ip6_tnl_get_iflink(const struct net_device *dev); 141 int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu); 142 143 static inline void ip6tunnel_xmit(struct sock *sk, struct sk_buff *skb, 144 struct net_device *dev) 145 { 146 int pkt_len, err; 147 148 pkt_len = skb->len - skb_inner_network_offset(skb); 149 err = ip6_local_out(dev_net(skb_dst(skb)->dev), sk, skb); 150 if (unlikely(net_xmit_eval(err))) 151 pkt_len = -1; 152 iptunnel_xmit_stats(dev, pkt_len); 153 } 154 #endif 155 #endif 156