1 #ifndef _IPV6_H 2 #define _IPV6_H 3 4 #include <linux/types.h> 5 #include <linux/in6.h> 6 #include <asm/byteorder.h> 7 8 /* The latest drafts declared increase in minimal mtu up to 1280. */ 9 10 #define IPV6_MIN_MTU 1280 11 12 /* 13 * Advanced API 14 * source interface/address selection, source routing, etc... 15 * *under construction* 16 */ 17 18 19 struct in6_pktinfo { 20 struct in6_addr ipi6_addr; 21 int ipi6_ifindex; 22 }; 23 24 struct ip6_mtuinfo { 25 struct sockaddr_in6 ip6m_addr; 26 __u32 ip6m_mtu; 27 }; 28 29 struct in6_ifreq { 30 struct in6_addr ifr6_addr; 31 __u32 ifr6_prefixlen; 32 int ifr6_ifindex; 33 }; 34 35 #define IPV6_SRCRT_STRICT 0x01 /* Deprecated; will be removed */ 36 #define IPV6_SRCRT_TYPE_0 0 /* Deprecated; will be removed */ 37 #define IPV6_SRCRT_TYPE_2 2 /* IPv6 type 2 Routing Header */ 38 39 /* 40 * routing header 41 */ 42 struct ipv6_rt_hdr { 43 __u8 nexthdr; 44 __u8 hdrlen; 45 __u8 type; 46 __u8 segments_left; 47 48 /* 49 * type specific data 50 * variable length field 51 */ 52 }; 53 54 55 struct ipv6_opt_hdr { 56 __u8 nexthdr; 57 __u8 hdrlen; 58 /* 59 * TLV encoded option data follows. 60 */ 61 } __attribute__((packed)); /* required for some archs */ 62 63 #define ipv6_destopt_hdr ipv6_opt_hdr 64 #define ipv6_hopopt_hdr ipv6_opt_hdr 65 66 #ifdef __KERNEL__ 67 #define ipv6_optlen(p) (((p)->hdrlen+1) << 3) 68 #endif 69 70 /* 71 * routing header type 0 (used in cmsghdr struct) 72 */ 73 74 struct rt0_hdr { 75 struct ipv6_rt_hdr rt_hdr; 76 __u32 reserved; 77 struct in6_addr addr[0]; 78 79 #define rt0_type rt_hdr.type 80 }; 81 82 /* 83 * routing header type 2 84 */ 85 86 struct rt2_hdr { 87 struct ipv6_rt_hdr rt_hdr; 88 __u32 reserved; 89 struct in6_addr addr; 90 91 #define rt2_type rt_hdr.type 92 }; 93 94 /* 95 * home address option in destination options header 96 */ 97 98 struct ipv6_destopt_hao { 99 __u8 type; 100 __u8 length; 101 struct in6_addr addr; 102 } __attribute__((packed)); 103 104 /* 105 * IPv6 fixed header 106 * 107 * BEWARE, it is incorrect. The first 4 bits of flow_lbl 108 * are glued to priority now, forming "class". 109 */ 110 111 struct ipv6hdr { 112 #if defined(__LITTLE_ENDIAN_BITFIELD) 113 __u8 priority:4, 114 version:4; 115 #elif defined(__BIG_ENDIAN_BITFIELD) 116 __u8 version:4, 117 priority:4; 118 #else 119 #error "Please fix <asm/byteorder.h>" 120 #endif 121 __u8 flow_lbl[3]; 122 123 __be16 payload_len; 124 __u8 nexthdr; 125 __u8 hop_limit; 126 127 struct in6_addr saddr; 128 struct in6_addr daddr; 129 }; 130 131 #ifdef __KERNEL__ 132 /* 133 * This structure contains configuration options per IPv6 link. 134 */ 135 struct ipv6_devconf { 136 __s32 forwarding; 137 __s32 hop_limit; 138 __s32 mtu6; 139 __s32 accept_ra; 140 __s32 accept_redirects; 141 __s32 autoconf; 142 __s32 dad_transmits; 143 __s32 rtr_solicits; 144 __s32 rtr_solicit_interval; 145 __s32 rtr_solicit_delay; 146 __s32 force_mld_version; 147 #ifdef CONFIG_IPV6_PRIVACY 148 __s32 use_tempaddr; 149 __s32 temp_valid_lft; 150 __s32 temp_prefered_lft; 151 __s32 regen_max_retry; 152 __s32 max_desync_factor; 153 #endif 154 __s32 max_addresses; 155 __s32 accept_ra_defrtr; 156 __s32 accept_ra_pinfo; 157 #ifdef CONFIG_IPV6_ROUTER_PREF 158 __s32 accept_ra_rtr_pref; 159 __s32 rtr_probe_interval; 160 #ifdef CONFIG_IPV6_ROUTE_INFO 161 __s32 accept_ra_rt_info_max_plen; 162 #endif 163 #endif 164 __s32 proxy_ndp; 165 __s32 accept_source_route; 166 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 167 __s32 optimistic_dad; 168 #endif 169 #ifdef CONFIG_IPV6_MROUTE 170 __s32 mc_forwarding; 171 #endif 172 __s32 disable_ipv6; 173 __s32 accept_dad; 174 __s32 force_tllao; 175 void *sysctl; 176 }; 177 178 struct ipv6_params { 179 __s32 disable_ipv6; 180 __s32 autoconf; 181 }; 182 extern struct ipv6_params ipv6_defaults; 183 #endif 184 185 /* index values for the variables in ipv6_devconf */ 186 enum { 187 DEVCONF_FORWARDING = 0, 188 DEVCONF_HOPLIMIT, 189 DEVCONF_MTU6, 190 DEVCONF_ACCEPT_RA, 191 DEVCONF_ACCEPT_REDIRECTS, 192 DEVCONF_AUTOCONF, 193 DEVCONF_DAD_TRANSMITS, 194 DEVCONF_RTR_SOLICITS, 195 DEVCONF_RTR_SOLICIT_INTERVAL, 196 DEVCONF_RTR_SOLICIT_DELAY, 197 DEVCONF_USE_TEMPADDR, 198 DEVCONF_TEMP_VALID_LFT, 199 DEVCONF_TEMP_PREFERED_LFT, 200 DEVCONF_REGEN_MAX_RETRY, 201 DEVCONF_MAX_DESYNC_FACTOR, 202 DEVCONF_MAX_ADDRESSES, 203 DEVCONF_FORCE_MLD_VERSION, 204 DEVCONF_ACCEPT_RA_DEFRTR, 205 DEVCONF_ACCEPT_RA_PINFO, 206 DEVCONF_ACCEPT_RA_RTR_PREF, 207 DEVCONF_RTR_PROBE_INTERVAL, 208 DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN, 209 DEVCONF_PROXY_NDP, 210 DEVCONF_OPTIMISTIC_DAD, 211 DEVCONF_ACCEPT_SOURCE_ROUTE, 212 DEVCONF_MC_FORWARDING, 213 DEVCONF_DISABLE_IPV6, 214 DEVCONF_ACCEPT_DAD, 215 DEVCONF_FORCE_TLLAO, 216 DEVCONF_MAX 217 }; 218 219 #ifdef __KERNEL__ 220 #include <linux/icmpv6.h> 221 #include <linux/tcp.h> 222 #include <linux/udp.h> 223 224 #include <net/inet_sock.h> 225 226 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb) 227 { 228 return (struct ipv6hdr *)skb_network_header(skb); 229 } 230 231 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb) 232 { 233 return (struct ipv6hdr *)skb_transport_header(skb); 234 } 235 236 static inline __u8 ipv6_tclass(const struct ipv6hdr *iph) 237 { 238 return (ntohl(*(__be32 *)iph) >> 20) & 0xff; 239 } 240 241 /* 242 This structure contains results of exthdrs parsing 243 as offsets from skb->nh. 244 */ 245 246 struct inet6_skb_parm { 247 int iif; 248 __u16 ra; 249 __u16 hop; 250 __u16 dst0; 251 __u16 srcrt; 252 __u16 dst1; 253 __u16 lastopt; 254 __u16 nhoff; 255 __u16 flags; 256 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 257 __u16 dsthao; 258 #endif 259 260 #define IP6SKB_XFRM_TRANSFORMED 1 261 #define IP6SKB_FORWARDED 2 262 #define IP6SKB_REROUTED 4 263 }; 264 265 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb)) 266 #define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb)) 267 268 static inline int inet6_iif(const struct sk_buff *skb) 269 { 270 return IP6CB(skb)->iif; 271 } 272 273 struct inet6_request_sock { 274 struct in6_addr loc_addr; 275 struct in6_addr rmt_addr; 276 struct sk_buff *pktopts; 277 int iif; 278 }; 279 280 struct tcp6_request_sock { 281 struct tcp_request_sock tcp6rsk_tcp; 282 struct inet6_request_sock tcp6rsk_inet6; 283 }; 284 285 struct ipv6_mc_socklist; 286 struct ipv6_ac_socklist; 287 struct ipv6_fl_socklist; 288 289 /** 290 * struct ipv6_pinfo - ipv6 private area 291 * 292 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc) 293 * this _must_ be the last member, so that inet6_sk_generic 294 * is able to calculate its offset from the base struct sock 295 * by using the struct proto->slab_obj_size member. -acme 296 */ 297 struct ipv6_pinfo { 298 struct in6_addr saddr; 299 struct in6_addr rcv_saddr; 300 struct in6_addr daddr; 301 struct in6_pktinfo sticky_pktinfo; 302 const struct in6_addr *daddr_cache; 303 #ifdef CONFIG_IPV6_SUBTREES 304 const struct in6_addr *saddr_cache; 305 #endif 306 307 __be32 flow_label; 308 __u32 frag_size; 309 310 /* 311 * Packed in 16bits. 312 * Omit one shift by by putting the signed field at MSB. 313 */ 314 #if defined(__BIG_ENDIAN_BITFIELD) 315 __s16 hop_limit:9; 316 __u16 __unused_1:7; 317 #else 318 __u16 __unused_1:7; 319 __s16 hop_limit:9; 320 #endif 321 322 #if defined(__BIG_ENDIAN_BITFIELD) 323 /* Packed in 16bits. */ 324 __s16 mcast_hops:9; 325 __u16 __unused_2:6, 326 mc_loop:1; 327 #else 328 __u16 mc_loop:1, 329 __unused_2:6; 330 __s16 mcast_hops:9; 331 #endif 332 int ucast_oif; 333 int mcast_oif; 334 335 /* pktoption flags */ 336 union { 337 struct { 338 __u16 srcrt:1, 339 osrcrt:1, 340 rxinfo:1, 341 rxoinfo:1, 342 rxhlim:1, 343 rxohlim:1, 344 hopopts:1, 345 ohopopts:1, 346 dstopts:1, 347 odstopts:1, 348 rxflow:1, 349 rxtclass:1, 350 rxpmtu:1, 351 rxorigdstaddr:1; 352 /* 2 bits hole */ 353 } bits; 354 __u16 all; 355 } rxopt; 356 357 /* sockopt flags */ 358 __u16 recverr:1, 359 sndflow:1, 360 pmtudisc:2, 361 ipv6only:1, 362 srcprefs:3, /* 001: prefer temporary address 363 * 010: prefer public address 364 * 100: prefer care-of address 365 */ 366 dontfrag:1; 367 __u8 min_hopcount; 368 __u8 tclass; 369 __u8 rcv_tclass; 370 371 __u32 dst_cookie; 372 373 struct ipv6_mc_socklist __rcu *ipv6_mc_list; 374 struct ipv6_ac_socklist *ipv6_ac_list; 375 struct ipv6_fl_socklist *ipv6_fl_list; 376 377 struct ipv6_txoptions *opt; 378 struct sk_buff *pktoptions; 379 struct sk_buff *rxpmtu; 380 struct { 381 struct ipv6_txoptions *opt; 382 u8 hop_limit; 383 u8 tclass; 384 } cork; 385 }; 386 387 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */ 388 struct raw6_sock { 389 /* inet_sock has to be the first member of raw6_sock */ 390 struct inet_sock inet; 391 __u32 checksum; /* perform checksum */ 392 __u32 offset; /* checksum offset */ 393 struct icmp6_filter filter; 394 __u32 ip6mr_table; 395 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */ 396 struct ipv6_pinfo inet6; 397 }; 398 399 struct udp6_sock { 400 struct udp_sock udp; 401 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */ 402 struct ipv6_pinfo inet6; 403 }; 404 405 struct tcp6_sock { 406 struct tcp_sock tcp; 407 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */ 408 struct ipv6_pinfo inet6; 409 }; 410 411 extern int inet6_sk_rebuild_header(struct sock *sk); 412 413 struct inet6_timewait_sock { 414 struct in6_addr tw_v6_daddr; 415 struct in6_addr tw_v6_rcv_saddr; 416 }; 417 418 struct tcp6_timewait_sock { 419 struct tcp_timewait_sock tcp6tw_tcp; 420 struct inet6_timewait_sock tcp6tw_inet6; 421 }; 422 423 static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk) 424 { 425 return (struct inet6_timewait_sock *)(((u8 *)sk) + 426 inet_twsk(sk)->tw_ipv6_offset); 427 } 428 429 #if IS_ENABLED(CONFIG_IPV6) 430 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 431 { 432 return inet_sk(__sk)->pinet6; 433 } 434 435 static inline struct inet6_request_sock * 436 inet6_rsk(const struct request_sock *rsk) 437 { 438 return (struct inet6_request_sock *)(((u8 *)rsk) + 439 inet_rsk(rsk)->inet6_rsk_offset); 440 } 441 442 static inline u32 inet6_rsk_offset(struct request_sock *rsk) 443 { 444 return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock); 445 } 446 447 static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops) 448 { 449 struct request_sock *req = reqsk_alloc(ops); 450 451 if (req != NULL) { 452 inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req); 453 inet6_rsk(req)->pktopts = NULL; 454 } 455 456 return req; 457 } 458 459 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 460 { 461 return (struct raw6_sock *)sk; 462 } 463 464 static inline void inet_sk_copy_descendant(struct sock *sk_to, 465 const struct sock *sk_from) 466 { 467 int ancestor_size = sizeof(struct inet_sock); 468 469 if (sk_from->sk_family == PF_INET6) 470 ancestor_size += sizeof(struct ipv6_pinfo); 471 472 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size); 473 } 474 475 #define __ipv6_only_sock(sk) (inet6_sk(sk)->ipv6only) 476 #define ipv6_only_sock(sk) ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk)) 477 478 static inline u16 inet6_tw_offset(const struct proto *prot) 479 { 480 return prot->twsk_prot->twsk_obj_size - 481 sizeof(struct inet6_timewait_sock); 482 } 483 484 static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk) 485 { 486 return likely(sk->sk_state != TCP_TIME_WAIT) ? 487 &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr; 488 } 489 490 static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk) 491 { 492 return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL; 493 } 494 495 static inline int inet_v6_ipv6only(const struct sock *sk) 496 { 497 return likely(sk->sk_state != TCP_TIME_WAIT) ? 498 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only; 499 } 500 #else 501 #define __ipv6_only_sock(sk) 0 502 #define ipv6_only_sock(sk) 0 503 504 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 505 { 506 return NULL; 507 } 508 509 static inline struct inet6_request_sock * 510 inet6_rsk(const struct request_sock *rsk) 511 { 512 return NULL; 513 } 514 515 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 516 { 517 return NULL; 518 } 519 520 #define __inet6_rcv_saddr(__sk) NULL 521 #define inet6_rcv_saddr(__sk) NULL 522 #define tcp_twsk_ipv6only(__sk) 0 523 #define inet_v6_ipv6only(__sk) 0 524 #endif /* IS_ENABLED(CONFIG_IPV6) */ 525 526 #define INET6_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif)\ 527 (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net) && \ 528 ((*((__portpair *)&(inet_sk(__sk)->inet_dport))) == (__ports)) && \ 529 ((__sk)->sk_family == AF_INET6) && \ 530 ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr)) && \ 531 ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \ 532 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif)))) 533 534 #define INET6_TW_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif) \ 535 (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net) && \ 536 (*((__portpair *)&(inet_twsk(__sk)->tw_dport)) == (__ports)) && \ 537 ((__sk)->sk_family == PF_INET6) && \ 538 (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_daddr, (__saddr))) && \ 539 (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_rcv_saddr, (__daddr))) && \ 540 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif)))) 541 542 #endif /* __KERNEL__ */ 543 544 #endif /* _IPV6_H */ 545