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 IP_TUNNEL_DECLARE_FLAGS(i_flags); 34 IP_TUNNEL_DECLARE_FLAGS(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 hlist_node hash_node; 49 struct net_device *dev; /* virtual device associated with tunnel */ 50 netdevice_tracker dev_tracker; 51 struct net *net; /* netns for packet i/o */ 52 struct __ip6_tnl_parm parms; /* tunnel configuration parameters */ 53 struct flowi fl; /* flowi template for xmit */ 54 struct dst_cache dst_cache; /* cached dst */ 55 struct gro_cells gro_cells; 56 57 int err_count; 58 unsigned long err_time; 59 60 /* These fields used only by GRE */ 61 __u32 i_seqno; /* The last seen seqno */ 62 atomic_t o_seqno; /* The last output seqno */ 63 int hlen; /* tun_hlen + encap_hlen */ 64 int tun_hlen; /* Precalculated header length */ 65 int encap_hlen; /* Encap header length (FOU,GUE) */ 66 struct ip_tunnel_encap encap; 67 int mlink; 68 }; 69 70 struct ip6_tnl_encap_ops { 71 size_t (*encap_hlen)(struct ip_tunnel_encap *e); 72 int (*build_header)(struct sk_buff *skb, struct ip_tunnel_encap *e, 73 u8 *protocol, struct flowi6 *fl6); 74 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 75 u8 type, u8 code, int offset, __be32 info); 76 }; 77 78 #ifdef CONFIG_INET 79 80 extern const struct ip6_tnl_encap_ops __rcu * 81 ip6tun_encaps[MAX_IPTUN_ENCAP_OPS]; 82 83 int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops, 84 unsigned int num); 85 int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops, 86 unsigned int num); 87 int ip6_tnl_encap_setup(struct ip6_tnl *t, 88 struct ip_tunnel_encap *ipencap); 89 90 static inline int ip6_encap_hlen(struct ip_tunnel_encap *e) 91 { 92 const struct ip6_tnl_encap_ops *ops; 93 int hlen = -EINVAL; 94 95 if (e->type == TUNNEL_ENCAP_NONE) 96 return 0; 97 98 if (e->type >= MAX_IPTUN_ENCAP_OPS) 99 return -EINVAL; 100 101 rcu_read_lock(); 102 ops = rcu_dereference(ip6tun_encaps[e->type]); 103 if (likely(ops && ops->encap_hlen)) 104 hlen = ops->encap_hlen(e); 105 rcu_read_unlock(); 106 107 return hlen; 108 } 109 110 static inline int ip6_tnl_encap(struct sk_buff *skb, struct ip6_tnl *t, 111 u8 *protocol, struct flowi6 *fl6) 112 { 113 const struct ip6_tnl_encap_ops *ops; 114 int ret = -EINVAL; 115 116 if (t->encap.type == TUNNEL_ENCAP_NONE) 117 return 0; 118 119 if (t->encap.type >= MAX_IPTUN_ENCAP_OPS) 120 return -EINVAL; 121 122 rcu_read_lock(); 123 ops = rcu_dereference(ip6tun_encaps[t->encap.type]); 124 if (likely(ops && ops->build_header)) 125 ret = ops->build_header(skb, &t->encap, protocol, fl6); 126 rcu_read_unlock(); 127 128 return ret; 129 } 130 131 /* Tunnel encapsulation limit destination sub-option */ 132 133 struct ipv6_tlv_tnl_enc_lim { 134 __u8 type; /* type-code for option */ 135 __u8 length; /* option length */ 136 __u8 encap_limit; /* tunnel encapsulation limit */ 137 } __packed; 138 139 int ip6_tnl_rcv_ctl(struct ip6_tnl *t, const struct in6_addr *laddr, 140 const struct in6_addr *raddr); 141 int ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb, 142 const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst, 143 bool log_ecn_error); 144 int ip6_tnl_xmit_ctl(struct ip6_tnl *t, const struct in6_addr *laddr, 145 const struct in6_addr *raddr); 146 int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield, 147 struct flowi6 *fl6, int encap_limit, __u32 *pmtu, __u8 proto); 148 __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw); 149 __u32 ip6_tnl_get_cap(struct ip6_tnl *t, const struct in6_addr *laddr, 150 const struct in6_addr *raddr); 151 struct net *ip6_tnl_get_link_net(const struct net_device *dev); 152 int ip6_tnl_get_iflink(const struct net_device *dev); 153 int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu); 154 155 static inline void ip6tunnel_xmit(struct sock *sk, struct sk_buff *skb, 156 struct net_device *dev, u16 ip6cb_flags) 157 { 158 int pkt_len, err; 159 160 if (unlikely(dev_recursion_level() > IP_TUNNEL_RECURSION_LIMIT)) { 161 if (dev) { 162 net_crit_ratelimited("Dead loop on virtual device %s, fix it urgently!\n", 163 dev->name); 164 DEV_STATS_INC(dev, tx_errors); 165 } 166 kfree_skb_reason(skb, SKB_DROP_REASON_RECURSION_LIMIT); 167 return; 168 } 169 170 dev_xmit_recursion_inc(); 171 172 memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); 173 IP6CB(skb)->flags = ip6cb_flags; 174 pkt_len = skb->len - skb_inner_network_offset(skb); 175 err = ip6_local_out(skb_dst_dev_net(skb), sk, skb); 176 177 if (dev) { 178 if (unlikely(net_xmit_eval(err))) 179 pkt_len = -1; 180 iptunnel_xmit_stats(dev, pkt_len); 181 } 182 183 dev_xmit_recursion_dec(); 184 } 185 #endif 186 #endif 187