1 #ifndef __NET_IP_TUNNELS_H 2 #define __NET_IP_TUNNELS_H 1 3 4 #include <linux/if_tunnel.h> 5 #include <linux/netdevice.h> 6 #include <linux/skbuff.h> 7 #include <linux/socket.h> 8 #include <linux/types.h> 9 #include <linux/u64_stats_sync.h> 10 #include <net/dsfield.h> 11 #include <net/gro_cells.h> 12 #include <net/inet_ecn.h> 13 #include <net/netns/generic.h> 14 #include <net/rtnetlink.h> 15 #include <net/lwtunnel.h> 16 #include <net/dst_cache.h> 17 18 #if IS_ENABLED(CONFIG_IPV6) 19 #include <net/ipv6.h> 20 #include <net/ip6_fib.h> 21 #include <net/ip6_route.h> 22 #endif 23 24 /* Keep error state on tunnel for 30 sec */ 25 #define IPTUNNEL_ERR_TIMEO (30*HZ) 26 27 /* Used to memset ip_tunnel padding. */ 28 #define IP_TUNNEL_KEY_SIZE offsetofend(struct ip_tunnel_key, tp_dst) 29 30 /* Used to memset ipv4 address padding. */ 31 #define IP_TUNNEL_KEY_IPV4_PAD offsetofend(struct ip_tunnel_key, u.ipv4.dst) 32 #define IP_TUNNEL_KEY_IPV4_PAD_LEN \ 33 (FIELD_SIZEOF(struct ip_tunnel_key, u) - \ 34 FIELD_SIZEOF(struct ip_tunnel_key, u.ipv4)) 35 36 struct ip_tunnel_key { 37 __be64 tun_id; 38 union { 39 struct { 40 __be32 src; 41 __be32 dst; 42 } ipv4; 43 struct { 44 struct in6_addr src; 45 struct in6_addr dst; 46 } ipv6; 47 } u; 48 __be16 tun_flags; 49 u8 tos; /* TOS for IPv4, TC for IPv6 */ 50 u8 ttl; /* TTL for IPv4, HL for IPv6 */ 51 __be16 tp_src; 52 __be16 tp_dst; 53 }; 54 55 /* Flags for ip_tunnel_info mode. */ 56 #define IP_TUNNEL_INFO_TX 0x01 /* represents tx tunnel parameters */ 57 #define IP_TUNNEL_INFO_IPV6 0x02 /* key contains IPv6 addresses */ 58 59 struct ip_tunnel_info { 60 struct ip_tunnel_key key; 61 #ifdef CONFIG_DST_CACHE 62 struct dst_cache dst_cache; 63 #endif 64 u8 options_len; 65 u8 mode; 66 }; 67 68 /* 6rd prefix/relay information */ 69 #ifdef CONFIG_IPV6_SIT_6RD 70 struct ip_tunnel_6rd_parm { 71 struct in6_addr prefix; 72 __be32 relay_prefix; 73 u16 prefixlen; 74 u16 relay_prefixlen; 75 }; 76 #endif 77 78 struct ip_tunnel_encap { 79 u16 type; 80 u16 flags; 81 __be16 sport; 82 __be16 dport; 83 }; 84 85 struct ip_tunnel_prl_entry { 86 struct ip_tunnel_prl_entry __rcu *next; 87 __be32 addr; 88 u16 flags; 89 struct rcu_head rcu_head; 90 }; 91 92 struct metadata_dst; 93 94 struct ip_tunnel { 95 struct ip_tunnel __rcu *next; 96 struct hlist_node hash_node; 97 struct net_device *dev; 98 struct net *net; /* netns for packet i/o */ 99 100 int err_count; /* Number of arrived ICMP errors */ 101 unsigned long err_time; /* Time when the last ICMP error 102 * arrived */ 103 104 /* These four fields used only by GRE */ 105 u32 i_seqno; /* The last seen seqno */ 106 u32 o_seqno; /* The last output seqno */ 107 int tun_hlen; /* Precalculated header length */ 108 int mlink; 109 110 struct dst_cache dst_cache; 111 112 struct ip_tunnel_parm parms; 113 114 int encap_hlen; /* Encap header length (FOU,GUE) */ 115 struct ip_tunnel_encap encap; 116 117 int hlen; /* tun_hlen + encap_hlen */ 118 119 /* for SIT */ 120 #ifdef CONFIG_IPV6_SIT_6RD 121 struct ip_tunnel_6rd_parm ip6rd; 122 #endif 123 struct ip_tunnel_prl_entry __rcu *prl; /* potential router list */ 124 unsigned int prl_count; /* # of entries in PRL */ 125 int ip_tnl_net_id; 126 struct gro_cells gro_cells; 127 bool collect_md; 128 }; 129 130 #define TUNNEL_CSUM __cpu_to_be16(0x01) 131 #define TUNNEL_ROUTING __cpu_to_be16(0x02) 132 #define TUNNEL_KEY __cpu_to_be16(0x04) 133 #define TUNNEL_SEQ __cpu_to_be16(0x08) 134 #define TUNNEL_STRICT __cpu_to_be16(0x10) 135 #define TUNNEL_REC __cpu_to_be16(0x20) 136 #define TUNNEL_VERSION __cpu_to_be16(0x40) 137 #define TUNNEL_NO_KEY __cpu_to_be16(0x80) 138 #define TUNNEL_DONT_FRAGMENT __cpu_to_be16(0x0100) 139 #define TUNNEL_OAM __cpu_to_be16(0x0200) 140 #define TUNNEL_CRIT_OPT __cpu_to_be16(0x0400) 141 #define TUNNEL_GENEVE_OPT __cpu_to_be16(0x0800) 142 #define TUNNEL_VXLAN_OPT __cpu_to_be16(0x1000) 143 144 #define TUNNEL_OPTIONS_PRESENT (TUNNEL_GENEVE_OPT | TUNNEL_VXLAN_OPT) 145 146 struct tnl_ptk_info { 147 __be16 flags; 148 __be16 proto; 149 __be32 key; 150 __be32 seq; 151 }; 152 153 #define PACKET_RCVD 0 154 #define PACKET_REJECT 1 155 156 #define IP_TNL_HASH_BITS 7 157 #define IP_TNL_HASH_SIZE (1 << IP_TNL_HASH_BITS) 158 159 struct ip_tunnel_net { 160 struct net_device *fb_tunnel_dev; 161 struct hlist_head tunnels[IP_TNL_HASH_SIZE]; 162 struct ip_tunnel __rcu *collect_md_tun; 163 }; 164 165 struct ip_tunnel_encap_ops { 166 size_t (*encap_hlen)(struct ip_tunnel_encap *e); 167 int (*build_header)(struct sk_buff *skb, struct ip_tunnel_encap *e, 168 u8 *protocol, struct flowi4 *fl4); 169 }; 170 171 #define MAX_IPTUN_ENCAP_OPS 8 172 173 extern const struct ip_tunnel_encap_ops __rcu * 174 iptun_encaps[MAX_IPTUN_ENCAP_OPS]; 175 176 int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *op, 177 unsigned int num); 178 int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *op, 179 unsigned int num); 180 181 static inline void ip_tunnel_key_init(struct ip_tunnel_key *key, 182 __be32 saddr, __be32 daddr, 183 u8 tos, u8 ttl, 184 __be16 tp_src, __be16 tp_dst, 185 __be64 tun_id, __be16 tun_flags) 186 { 187 key->tun_id = tun_id; 188 key->u.ipv4.src = saddr; 189 key->u.ipv4.dst = daddr; 190 memset((unsigned char *)key + IP_TUNNEL_KEY_IPV4_PAD, 191 0, IP_TUNNEL_KEY_IPV4_PAD_LEN); 192 key->tos = tos; 193 key->ttl = ttl; 194 key->tun_flags = tun_flags; 195 196 /* For the tunnel types on the top of IPsec, the tp_src and tp_dst of 197 * the upper tunnel are used. 198 * E.g: GRE over IPSEC, the tp_src and tp_port are zero. 199 */ 200 key->tp_src = tp_src; 201 key->tp_dst = tp_dst; 202 203 /* Clear struct padding. */ 204 if (sizeof(*key) != IP_TUNNEL_KEY_SIZE) 205 memset((unsigned char *)key + IP_TUNNEL_KEY_SIZE, 206 0, sizeof(*key) - IP_TUNNEL_KEY_SIZE); 207 } 208 209 static inline unsigned short ip_tunnel_info_af(const struct ip_tunnel_info 210 *tun_info) 211 { 212 return tun_info->mode & IP_TUNNEL_INFO_IPV6 ? AF_INET6 : AF_INET; 213 } 214 215 #ifdef CONFIG_INET 216 217 int ip_tunnel_init(struct net_device *dev); 218 void ip_tunnel_uninit(struct net_device *dev); 219 void ip_tunnel_dellink(struct net_device *dev, struct list_head *head); 220 struct net *ip_tunnel_get_link_net(const struct net_device *dev); 221 int ip_tunnel_get_iflink(const struct net_device *dev); 222 int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id, 223 struct rtnl_link_ops *ops, char *devname); 224 225 void ip_tunnel_delete_net(struct ip_tunnel_net *itn, struct rtnl_link_ops *ops); 226 227 void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, 228 const struct iphdr *tnl_params, const u8 protocol); 229 int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd); 230 int ip_tunnel_encap(struct sk_buff *skb, struct ip_tunnel *t, 231 u8 *protocol, struct flowi4 *fl4); 232 int __ip_tunnel_change_mtu(struct net_device *dev, int new_mtu, bool strict); 233 int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu); 234 235 struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev, 236 struct rtnl_link_stats64 *tot); 237 struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn, 238 int link, __be16 flags, 239 __be32 remote, __be32 local, 240 __be32 key); 241 242 int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb, 243 const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst, 244 bool log_ecn_error); 245 int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[], 246 struct ip_tunnel_parm *p); 247 int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[], 248 struct ip_tunnel_parm *p); 249 void ip_tunnel_setup(struct net_device *dev, int net_id); 250 int ip_tunnel_encap_setup(struct ip_tunnel *t, 251 struct ip_tunnel_encap *ipencap); 252 253 /* Extract dsfield from inner protocol */ 254 static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph, 255 const struct sk_buff *skb) 256 { 257 if (skb->protocol == htons(ETH_P_IP)) 258 return iph->tos; 259 else if (skb->protocol == htons(ETH_P_IPV6)) 260 return ipv6_get_dsfield((const struct ipv6hdr *)iph); 261 else 262 return 0; 263 } 264 265 /* Propogate ECN bits out */ 266 static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph, 267 const struct sk_buff *skb) 268 { 269 u8 inner = ip_tunnel_get_dsfield(iph, skb); 270 271 return INET_ECN_encapsulate(tos, inner); 272 } 273 274 int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto, 275 bool xnet); 276 void iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb, 277 __be32 src, __be32 dst, u8 proto, 278 u8 tos, u8 ttl, __be16 df, bool xnet); 279 struct metadata_dst *iptunnel_metadata_reply(struct metadata_dst *md, 280 gfp_t flags); 281 282 struct sk_buff *iptunnel_handle_offloads(struct sk_buff *skb, int gso_type_mask); 283 284 static inline void iptunnel_xmit_stats(struct net_device *dev, int pkt_len) 285 { 286 if (pkt_len > 0) { 287 struct pcpu_sw_netstats *tstats = get_cpu_ptr(dev->tstats); 288 289 u64_stats_update_begin(&tstats->syncp); 290 tstats->tx_bytes += pkt_len; 291 tstats->tx_packets++; 292 u64_stats_update_end(&tstats->syncp); 293 put_cpu_ptr(tstats); 294 } else { 295 struct net_device_stats *err_stats = &dev->stats; 296 297 if (pkt_len < 0) { 298 err_stats->tx_errors++; 299 err_stats->tx_aborted_errors++; 300 } else { 301 err_stats->tx_dropped++; 302 } 303 } 304 } 305 306 static inline void *ip_tunnel_info_opts(struct ip_tunnel_info *info) 307 { 308 return info + 1; 309 } 310 311 static inline void ip_tunnel_info_opts_get(void *to, 312 const struct ip_tunnel_info *info) 313 { 314 memcpy(to, info + 1, info->options_len); 315 } 316 317 static inline void ip_tunnel_info_opts_set(struct ip_tunnel_info *info, 318 const void *from, int len) 319 { 320 memcpy(ip_tunnel_info_opts(info), from, len); 321 info->options_len = len; 322 } 323 324 static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate) 325 { 326 return (struct ip_tunnel_info *)lwtstate->data; 327 } 328 329 extern struct static_key ip_tunnel_metadata_cnt; 330 331 /* Returns > 0 if metadata should be collected */ 332 static inline int ip_tunnel_collect_metadata(void) 333 { 334 return static_key_false(&ip_tunnel_metadata_cnt); 335 } 336 337 void __init ip_tunnel_core_init(void); 338 339 void ip_tunnel_need_metadata(void); 340 void ip_tunnel_unneed_metadata(void); 341 342 #else /* CONFIG_INET */ 343 344 static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate) 345 { 346 return NULL; 347 } 348 349 static inline void ip_tunnel_need_metadata(void) 350 { 351 } 352 353 static inline void ip_tunnel_unneed_metadata(void) 354 { 355 } 356 357 #endif /* CONFIG_INET */ 358 359 #endif /* __NET_IP_TUNNELS_H */ 360