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 158