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 netdevice_tracker dev_tracker; 50 struct net *net; /* netns for packet i/o */ 51 struct __ip6_tnl_parm parms; /* tunnel configuration parameters */ 52 struct flowi fl; /* flowi template for xmit */ 53 struct dst_cache dst_cache; /* cached dst */ 54 struct gro_cells gro_cells; 55 56 int err_count; 57 unsigned long err_time; 58 59 /* These fields used only by GRE */ 60 __u32 i_seqno; /* The last seen seqno */ 61 atomic_t o_seqno; /* The last output seqno */ 62 int hlen; /* tun_hlen + encap_hlen */ 63 int tun_hlen; /* Precalculated header length */ 64 int encap_hlen; /* Encap header length (FOU,GUE) */ 65 struct ip_tunnel_encap encap; 66 int mlink; 67 }; 68 69 struct ip6_tnl_encap_ops { 70 size_t (*encap_hlen)(struct ip_tunnel_encap *e); 71 int (*build_header)(struct sk_buff *skb, struct ip_tunnel_encap *e, 72 u8 *protocol, struct flowi6 *fl6); 73 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 74 u8 type, u8 code, int offset, __be32 info); 75 }; 76 77 #ifdef CONFIG_INET 78 79 extern const struct ip6_tnl_encap_ops __rcu * 80 ip6tun_encaps[MAX_IPTUN_ENCAP_OPS]; 81 82 int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops, 83 unsigned int num); 84 int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops, 85 unsigned int num); 86 int ip6_tnl_encap_setup(struct ip6_tnl *t, 87 struct ip_tunnel_encap *ipencap); 88 89 static inline int ip6_encap_hlen(struct ip_tunnel_encap *e) 90 { 91 const struct ip6_tnl_encap_ops *ops; 92 int hlen = -EINVAL; 93 94 if (e->type == TUNNEL_ENCAP_NONE) 95 return 0; 96 97 if (e->type >= MAX_IPTUN_ENCAP_OPS) 98 return -EINVAL; 99 100 rcu_read_lock(); 101 ops = rcu_dereference(ip6tun_encaps[e->type]); 102 if (likely(ops && ops->encap_hlen)) 103 hlen = ops->encap_hlen(e); 104 rcu_read_unlock(); 105 106 return hlen; 107 } 108 109 static inline int ip6_tnl_encap(struct sk_buff *skb, struct ip6_tnl *t, 110 u8 *protocol, struct flowi6 *fl6) 111 { 112 const struct ip6_tnl_encap_ops *ops; 113 int ret = -EINVAL; 114 115 if (t->encap.type == TUNNEL_ENCAP_NONE) 116 return 0; 117 118 if (t->encap.type >= MAX_IPTUN_ENCAP_OPS) 119 return -EINVAL; 120 121 rcu_read_lock(); 122 ops = rcu_dereference(ip6tun_encaps[t->encap.type]); 123 if (likely(ops && ops->build_header)) 124 ret = ops->build_header(skb, &t->encap, protocol, fl6); 125 rcu_read_unlock(); 126 127 return ret; 128 } 129 130 /* Tunnel encapsulation limit destination sub-option */ 131 132 struct ipv6_tlv_tnl_enc_lim { 133 __u8 type; /* type-code for option */ 134 __u8 length; /* option length */ 135 __u8 encap_limit; /* tunnel encapsulation limit */ 136 } __packed; 137 138 int ip6_tnl_rcv_ctl(struct ip6_tnl *t, const struct in6_addr *laddr, 139 const struct in6_addr *raddr); 140 int ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb, 141 const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst, 142 bool log_ecn_error); 143 int ip6_tnl_xmit_ctl(struct ip6_tnl *t, const struct in6_addr *laddr, 144 const struct in6_addr *raddr); 145 int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield, 146 struct flowi6 *fl6, int encap_limit, __u32 *pmtu, __u8 proto); 147 __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw); 148 __u32 ip6_tnl_get_cap(struct ip6_tnl *t, const struct in6_addr *laddr, 149 const struct in6_addr *raddr); 150 struct net *ip6_tnl_get_link_net(const struct net_device *dev); 151 int ip6_tnl_get_iflink(const struct net_device *dev); 152 int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu); 153 154 static inline void ip6tunnel_xmit(struct sock *sk, struct sk_buff *skb, 155 struct net_device *dev) 156 { 157 int pkt_len, err; 158 159 memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); 160 pkt_len = skb->len - skb_inner_network_offset(skb); 161 err = ip6_local_out(dev_net(skb_dst(skb)->dev), sk, skb); 162 163 if (dev) { 164 if (unlikely(net_xmit_eval(err))) 165 pkt_len = -1; 166 iptunnel_xmit_stats(dev, pkt_len); 167 } 168 } 169 #endif 170 #endif 171