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 }; 40 41 /* IPv6 tunnel */ 42 struct ip6_tnl { 43 struct ip6_tnl __rcu *next; /* next tunnel in list */ 44 struct net_device *dev; /* virtual device associated with tunnel */ 45 struct net *net; /* netns for packet i/o */ 46 struct __ip6_tnl_parm parms; /* tunnel configuration parameters */ 47 struct flowi fl; /* flowi template for xmit */ 48 struct dst_cache dst_cache; /* cached dst */ 49 struct gro_cells gro_cells; 50 51 int err_count; 52 unsigned long err_time; 53 54 /* These fields used only by GRE */ 55 __u32 i_seqno; /* The last seen seqno */ 56 __u32 o_seqno; /* The last output seqno */ 57 int hlen; /* tun_hlen + encap_hlen */ 58 int tun_hlen; /* Precalculated header length */ 59 int encap_hlen; /* Encap header length (FOU,GUE) */ 60 struct ip_tunnel_encap encap; 61 int mlink; 62 }; 63 64 struct ip6_tnl_encap_ops { 65 size_t (*encap_hlen)(struct ip_tunnel_encap *e); 66 int (*build_header)(struct sk_buff *skb, struct ip_tunnel_encap *e, 67 u8 *protocol, struct flowi6 *fl6); 68 }; 69 70 #ifdef CONFIG_INET 71 72 extern const struct ip6_tnl_encap_ops __rcu * 73 ip6tun_encaps[MAX_IPTUN_ENCAP_OPS]; 74 75 int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops, 76 unsigned int num); 77 int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops, 78 unsigned int num); 79 int ip6_tnl_encap_setup(struct ip6_tnl *t, 80 struct ip_tunnel_encap *ipencap); 81 82 static inline int ip6_encap_hlen(struct ip_tunnel_encap *e) 83 { 84 const struct ip6_tnl_encap_ops *ops; 85 int hlen = -EINVAL; 86 87 if (e->type == TUNNEL_ENCAP_NONE) 88 return 0; 89 90 if (e->type >= MAX_IPTUN_ENCAP_OPS) 91 return -EINVAL; 92 93 rcu_read_lock(); 94 ops = rcu_dereference(ip6tun_encaps[e->type]); 95 if (likely(ops && ops->encap_hlen)) 96 hlen = ops->encap_hlen(e); 97 rcu_read_unlock(); 98 99 return hlen; 100 } 101 102 static inline int ip6_tnl_encap(struct sk_buff *skb, struct ip6_tnl *t, 103 u8 *protocol, struct flowi6 *fl6) 104 { 105 const struct ip6_tnl_encap_ops *ops; 106 int ret = -EINVAL; 107 108 if (t->encap.type == TUNNEL_ENCAP_NONE) 109 return 0; 110 111 if (t->encap.type >= MAX_IPTUN_ENCAP_OPS) 112 return -EINVAL; 113 114 rcu_read_lock(); 115 ops = rcu_dereference(ip6tun_encaps[t->encap.type]); 116 if (likely(ops && ops->build_header)) 117 ret = ops->build_header(skb, &t->encap, protocol, fl6); 118 rcu_read_unlock(); 119 120 return ret; 121 } 122 123 /* Tunnel encapsulation limit destination sub-option */ 124 125 struct ipv6_tlv_tnl_enc_lim { 126 __u8 type; /* type-code for option */ 127 __u8 length; /* option length */ 128 __u8 encap_limit; /* tunnel encapsulation limit */ 129 } __packed; 130 131 int ip6_tnl_rcv_ctl(struct ip6_tnl *t, const struct in6_addr *laddr, 132 const struct in6_addr *raddr); 133 int ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb, 134 const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst, 135 bool log_ecn_error); 136 int ip6_tnl_xmit_ctl(struct ip6_tnl *t, const struct in6_addr *laddr, 137 const struct in6_addr *raddr); 138 int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield, 139 struct flowi6 *fl6, int encap_limit, __u32 *pmtu, __u8 proto); 140 __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw); 141 __u32 ip6_tnl_get_cap(struct ip6_tnl *t, const struct in6_addr *laddr, 142 const struct in6_addr *raddr); 143 struct net *ip6_tnl_get_link_net(const struct net_device *dev); 144 int ip6_tnl_get_iflink(const struct net_device *dev); 145 int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu); 146 147 static inline void ip6tunnel_xmit(struct sock *sk, struct sk_buff *skb, 148 struct net_device *dev) 149 { 150 int pkt_len, err; 151 152 memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); 153 pkt_len = skb->len - skb_inner_network_offset(skb); 154 err = ip6_local_out(dev_net(skb_dst(skb)->dev), sk, skb); 155 if (unlikely(net_xmit_eval(err))) 156 pkt_len = -1; 157 iptunnel_xmit_stats(dev, pkt_len); 158 } 159 #endif 160 #endif 161