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 __u32 fwmark; 38 }; 39 40 /* IPv6 tunnel */ 41 struct ip6_tnl { 42 struct ip6_tnl __rcu *next; /* next tunnel in list */ 43 struct net_device *dev; /* virtual device associated with tunnel */ 44 struct net *net; /* netns for packet i/o */ 45 struct __ip6_tnl_parm parms; /* tunnel configuration parameters */ 46 struct flowi fl; /* flowi template for xmit */ 47 struct dst_cache dst_cache; /* cached dst */ 48 struct gro_cells gro_cells; 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; /* tun_hlen + encap_hlen */ 57 int tun_hlen; /* Precalculated header length */ 58 int encap_hlen; /* Encap header length (FOU,GUE) */ 59 struct ip_tunnel_encap encap; 60 int mlink; 61 }; 62 63 struct ip6_tnl_encap_ops { 64 size_t (*encap_hlen)(struct ip_tunnel_encap *e); 65 int (*build_header)(struct sk_buff *skb, struct ip_tunnel_encap *e, 66 u8 *protocol, struct flowi6 *fl6); 67 }; 68 69 #ifdef CONFIG_INET 70 71 extern const struct ip6_tnl_encap_ops __rcu * 72 ip6tun_encaps[MAX_IPTUN_ENCAP_OPS]; 73 74 int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops, 75 unsigned int num); 76 int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops, 77 unsigned int num); 78 int ip6_tnl_encap_setup(struct ip6_tnl *t, 79 struct ip_tunnel_encap *ipencap); 80 81 static inline int ip6_encap_hlen(struct ip_tunnel_encap *e) 82 { 83 const struct ip6_tnl_encap_ops *ops; 84 int hlen = -EINVAL; 85 86 if (e->type == TUNNEL_ENCAP_NONE) 87 return 0; 88 89 if (e->type >= MAX_IPTUN_ENCAP_OPS) 90 return -EINVAL; 91 92 rcu_read_lock(); 93 ops = rcu_dereference(ip6tun_encaps[e->type]); 94 if (likely(ops && ops->encap_hlen)) 95 hlen = ops->encap_hlen(e); 96 rcu_read_unlock(); 97 98 return hlen; 99 } 100 101 static inline int ip6_tnl_encap(struct sk_buff *skb, struct ip6_tnl *t, 102 u8 *protocol, struct flowi6 *fl6) 103 { 104 const struct ip6_tnl_encap_ops *ops; 105 int ret = -EINVAL; 106 107 if (t->encap.type == TUNNEL_ENCAP_NONE) 108 return 0; 109 110 if (t->encap.type >= MAX_IPTUN_ENCAP_OPS) 111 return -EINVAL; 112 113 rcu_read_lock(); 114 ops = rcu_dereference(ip6tun_encaps[t->encap.type]); 115 if (likely(ops && ops->build_header)) 116 ret = ops->build_header(skb, &t->encap, protocol, fl6); 117 rcu_read_unlock(); 118 119 return ret; 120 } 121 122 /* Tunnel encapsulation limit destination sub-option */ 123 124 struct ipv6_tlv_tnl_enc_lim { 125 __u8 type; /* type-code for option */ 126 __u8 length; /* option length */ 127 __u8 encap_limit; /* tunnel encapsulation limit */ 128 } __packed; 129 130 int ip6_tnl_rcv_ctl(struct ip6_tnl *t, const struct in6_addr *laddr, 131 const struct in6_addr *raddr); 132 int ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb, 133 const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst, 134 bool log_ecn_error); 135 int ip6_tnl_xmit_ctl(struct ip6_tnl *t, const struct in6_addr *laddr, 136 const struct in6_addr *raddr); 137 int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield, 138 struct flowi6 *fl6, int encap_limit, __u32 *pmtu, __u8 proto); 139 __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw); 140 __u32 ip6_tnl_get_cap(struct ip6_tnl *t, const struct in6_addr *laddr, 141 const struct in6_addr *raddr); 142 struct net *ip6_tnl_get_link_net(const struct net_device *dev); 143 int ip6_tnl_get_iflink(const struct net_device *dev); 144 int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu); 145 146 static inline void ip6tunnel_xmit(struct sock *sk, struct sk_buff *skb, 147 struct net_device *dev) 148 { 149 int pkt_len, err; 150 151 memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); 152 pkt_len = skb->len - skb_inner_network_offset(skb); 153 err = ip6_local_out(dev_net(skb_dst(skb)->dev), sk, skb); 154 if (unlikely(net_xmit_eval(err))) 155 pkt_len = -1; 156 iptunnel_xmit_stats(dev, pkt_len); 157 } 158 #endif 159 #endif 160