1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _NET_IP6_TUNNEL_H 3 #define _NET_IP6_TUNNEL_H 4 5 #include <linux/ipv6.h> 6 #include <linux/netdevice.h> 7 #include <linux/if_tunnel.h> 8 #include <linux/ip6_tunnel.h> 9 #include <net/ip_tunnels.h> 10 #include <net/dst_cache.h> 11 12 #define IP6TUNNEL_ERR_TIMEO (30*HZ) 13 14 /* capable of sending packets */ 15 #define IP6_TNL_F_CAP_XMIT 0x10000 16 /* capable of receiving packets */ 17 #define IP6_TNL_F_CAP_RCV 0x20000 18 /* determine capability on a per-packet basis */ 19 #define IP6_TNL_F_CAP_PER_PACKET 0x40000 20 21 struct __ip6_tnl_parm { 22 char name[IFNAMSIZ]; /* name of tunnel device */ 23 int link; /* ifindex of underlying L2 interface */ 24 __u8 proto; /* tunnel protocol */ 25 __u8 encap_limit; /* encapsulation limit for tunnel */ 26 __u8 hop_limit; /* hop limit for tunnel */ 27 bool collect_md; 28 __be32 flowinfo; /* traffic class and flowlabel for tunnel */ 29 __u32 flags; /* tunnel flags */ 30 struct in6_addr laddr; /* local tunnel end-point address */ 31 struct in6_addr raddr; /* remote tunnel end-point address */ 32 33 __be16 i_flags; 34 __be16 o_flags; 35 __be32 i_key; 36 __be32 o_key; 37 38 __u32 fwmark; 39 __u32 index; /* ERSPAN type II index */ 40 __u8 erspan_ver; /* ERSPAN version */ 41 __u8 dir; /* direction */ 42 __u16 hwid; /* hwid */ 43 }; 44 45 /* IPv6 tunnel */ 46 struct ip6_tnl { 47 struct ip6_tnl __rcu *next; /* next tunnel in list */ 48 struct net_device *dev; /* virtual device associated with tunnel */ 49 struct net *net; /* netns for packet i/o */ 50 struct __ip6_tnl_parm parms; /* tunnel configuration parameters */ 51 struct flowi fl; /* flowi template for xmit */ 52 struct dst_cache dst_cache; /* cached dst */ 53 struct gro_cells gro_cells; 54 55 int err_count; 56 unsigned long err_time; 57 58 /* These fields used only by GRE */ 59 __u32 i_seqno; /* The last seen seqno */ 60 __u32 o_seqno; /* The last output seqno */ 61 int hlen; /* tun_hlen + encap_hlen */ 62 int tun_hlen; /* Precalculated header length */ 63 int encap_hlen; /* Encap header length (FOU,GUE) */ 64 struct ip_tunnel_encap encap; 65 int mlink; 66 }; 67 68 struct ip6_tnl_encap_ops { 69 size_t (*encap_hlen)(struct ip_tunnel_encap *e); 70 int (*build_header)(struct sk_buff *skb, struct ip_tunnel_encap *e, 71 u8 *protocol, struct flowi6 *fl6); 72 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 73 u8 type, u8 code, int offset, __be32 info); 74 }; 75 76 #ifdef CONFIG_INET 77 78 extern const struct ip6_tnl_encap_ops __rcu * 79 ip6tun_encaps[MAX_IPTUN_ENCAP_OPS]; 80 81 int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops, 82 unsigned int num); 83 int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops, 84 unsigned int num); 85 int ip6_tnl_encap_setup(struct ip6_tnl *t, 86 struct ip_tunnel_encap *ipencap); 87 88 static inline int ip6_encap_hlen(struct ip_tunnel_encap *e) 89 { 90 const struct ip6_tnl_encap_ops *ops; 91 int hlen = -EINVAL; 92 93 if (e->type == TUNNEL_ENCAP_NONE) 94 return 0; 95 96 if (e->type >= MAX_IPTUN_ENCAP_OPS) 97 return -EINVAL; 98 99 rcu_read_lock(); 100 ops = rcu_dereference(ip6tun_encaps[e->type]); 101 if (likely(ops && ops->encap_hlen)) 102 hlen = ops->encap_hlen(e); 103 rcu_read_unlock(); 104 105 return hlen; 106 } 107 108 static inline int ip6_tnl_encap(struct sk_buff *skb, struct ip6_tnl *t, 109 u8 *protocol, struct flowi6 *fl6) 110 { 111 const struct ip6_tnl_encap_ops *ops; 112 int ret = -EINVAL; 113 114 if (t->encap.type == TUNNEL_ENCAP_NONE) 115 return 0; 116 117 if (t->encap.type >= MAX_IPTUN_ENCAP_OPS) 118 return -EINVAL; 119 120 rcu_read_lock(); 121 ops = rcu_dereference(ip6tun_encaps[t->encap.type]); 122 if (likely(ops && ops->build_header)) 123 ret = ops->build_header(skb, &t->encap, protocol, fl6); 124 rcu_read_unlock(); 125 126 return ret; 127 } 128 129 /* Tunnel encapsulation limit destination sub-option */ 130 131 struct ipv6_tlv_tnl_enc_lim { 132 __u8 type; /* type-code for option */ 133 __u8 length; /* option length */ 134 __u8 encap_limit; /* tunnel encapsulation limit */ 135 } __packed; 136 137 int ip6_tnl_rcv_ctl(struct ip6_tnl *t, const struct in6_addr *laddr, 138 const struct in6_addr *raddr); 139 int ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb, 140 const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst, 141 bool log_ecn_error); 142 int ip6_tnl_xmit_ctl(struct ip6_tnl *t, const struct in6_addr *laddr, 143 const struct in6_addr *raddr); 144 int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield, 145 struct flowi6 *fl6, int encap_limit, __u32 *pmtu, __u8 proto); 146 __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw); 147 __u32 ip6_tnl_get_cap(struct ip6_tnl *t, const struct in6_addr *laddr, 148 const struct in6_addr *raddr); 149 struct net *ip6_tnl_get_link_net(const struct net_device *dev); 150 int ip6_tnl_get_iflink(const struct net_device *dev); 151 int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu); 152 153 static inline void ip6tunnel_xmit(struct sock *sk, struct sk_buff *skb, 154 struct net_device *dev) 155 { 156 int pkt_len, err; 157 158 memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); 159 pkt_len = skb->len - skb_inner_network_offset(skb); 160 err = ip6_local_out(dev_net(skb_dst(skb)->dev), sk, skb); 161 162 if (dev) { 163 if (unlikely(net_xmit_eval(err))) 164 pkt_len = -1; 165 iptunnel_xmit_stats(dev, pkt_len); 166 } 167 } 168 #endif 169 #endif 170