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 __u16 frag_max_size; 260 261 #define IP6SKB_XFRM_TRANSFORMED 1 262 #define IP6SKB_FORWARDED 2 263 #define IP6SKB_REROUTED 4 264 }; 265 266 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb)) 267 #define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb)) 268 269 static inline int inet6_iif(const struct sk_buff *skb) 270 { 271 return IP6CB(skb)->iif; 272 } 273 274 struct inet6_request_sock { 275 struct in6_addr loc_addr; 276 struct in6_addr rmt_addr; 277 struct sk_buff *pktopts; 278 int iif; 279 }; 280 281 struct tcp6_request_sock { 282 struct tcp_request_sock tcp6rsk_tcp; 283 struct inet6_request_sock tcp6rsk_inet6; 284 }; 285 286 struct ipv6_mc_socklist; 287 struct ipv6_ac_socklist; 288 struct ipv6_fl_socklist; 289 290 /** 291 * struct ipv6_pinfo - ipv6 private area 292 * 293 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc) 294 * this _must_ be the last member, so that inet6_sk_generic 295 * is able to calculate its offset from the base struct sock 296 * by using the struct proto->slab_obj_size member. -acme 297 */ 298 struct ipv6_pinfo { 299 struct in6_addr saddr; 300 struct in6_addr rcv_saddr; 301 struct in6_addr daddr; 302 struct in6_pktinfo sticky_pktinfo; 303 const struct in6_addr *daddr_cache; 304 #ifdef CONFIG_IPV6_SUBTREES 305 const struct in6_addr *saddr_cache; 306 #endif 307 308 __be32 flow_label; 309 __u32 frag_size; 310 311 /* 312 * Packed in 16bits. 313 * Omit one shift by by putting the signed field at MSB. 314 */ 315 #if defined(__BIG_ENDIAN_BITFIELD) 316 __s16 hop_limit:9; 317 __u16 __unused_1:7; 318 #else 319 __u16 __unused_1:7; 320 __s16 hop_limit:9; 321 #endif 322 323 #if defined(__BIG_ENDIAN_BITFIELD) 324 /* Packed in 16bits. */ 325 __s16 mcast_hops:9; 326 __u16 __unused_2:6, 327 mc_loop:1; 328 #else 329 __u16 mc_loop:1, 330 __unused_2:6; 331 __s16 mcast_hops:9; 332 #endif 333 int ucast_oif; 334 int mcast_oif; 335 336 /* pktoption flags */ 337 union { 338 struct { 339 __u16 srcrt:1, 340 osrcrt:1, 341 rxinfo:1, 342 rxoinfo:1, 343 rxhlim:1, 344 rxohlim:1, 345 hopopts:1, 346 ohopopts:1, 347 dstopts:1, 348 odstopts:1, 349 rxflow:1, 350 rxtclass:1, 351 rxpmtu:1, 352 rxorigdstaddr:1; 353 /* 2 bits hole */ 354 } bits; 355 __u16 all; 356 } rxopt; 357 358 /* sockopt flags */ 359 __u16 recverr:1, 360 sndflow:1, 361 pmtudisc:2, 362 ipv6only:1, 363 srcprefs:3, /* 001: prefer temporary address 364 * 010: prefer public address 365 * 100: prefer care-of address 366 */ 367 dontfrag:1; 368 __u8 min_hopcount; 369 __u8 tclass; 370 __u8 rcv_tclass; 371 372 __u32 dst_cookie; 373 __u32 rx_dst_cookie; 374 375 struct ipv6_mc_socklist __rcu *ipv6_mc_list; 376 struct ipv6_ac_socklist *ipv6_ac_list; 377 struct ipv6_fl_socklist *ipv6_fl_list; 378 379 struct ipv6_txoptions *opt; 380 struct sk_buff *pktoptions; 381 struct sk_buff *rxpmtu; 382 struct { 383 struct ipv6_txoptions *opt; 384 u8 hop_limit; 385 u8 tclass; 386 } cork; 387 }; 388 389 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */ 390 struct raw6_sock { 391 /* inet_sock has to be the first member of raw6_sock */ 392 struct inet_sock inet; 393 __u32 checksum; /* perform checksum */ 394 __u32 offset; /* checksum offset */ 395 struct icmp6_filter filter; 396 __u32 ip6mr_table; 397 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */ 398 struct ipv6_pinfo inet6; 399 }; 400 401 struct udp6_sock { 402 struct udp_sock udp; 403 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */ 404 struct ipv6_pinfo inet6; 405 }; 406 407 struct tcp6_sock { 408 struct tcp_sock tcp; 409 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */ 410 struct ipv6_pinfo inet6; 411 }; 412 413 extern int inet6_sk_rebuild_header(struct sock *sk); 414 415 struct inet6_timewait_sock { 416 struct in6_addr tw_v6_daddr; 417 struct in6_addr tw_v6_rcv_saddr; 418 }; 419 420 struct tcp6_timewait_sock { 421 struct tcp_timewait_sock tcp6tw_tcp; 422 struct inet6_timewait_sock tcp6tw_inet6; 423 }; 424 425 static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk) 426 { 427 return (struct inet6_timewait_sock *)(((u8 *)sk) + 428 inet_twsk(sk)->tw_ipv6_offset); 429 } 430 431 #if IS_ENABLED(CONFIG_IPV6) 432 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 433 { 434 return inet_sk(__sk)->pinet6; 435 } 436 437 static inline struct inet6_request_sock * 438 inet6_rsk(const struct request_sock *rsk) 439 { 440 return (struct inet6_request_sock *)(((u8 *)rsk) + 441 inet_rsk(rsk)->inet6_rsk_offset); 442 } 443 444 static inline u32 inet6_rsk_offset(struct request_sock *rsk) 445 { 446 return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock); 447 } 448 449 static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops) 450 { 451 struct request_sock *req = reqsk_alloc(ops); 452 453 if (req != NULL) { 454 inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req); 455 inet6_rsk(req)->pktopts = NULL; 456 } 457 458 return req; 459 } 460 461 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 462 { 463 return (struct raw6_sock *)sk; 464 } 465 466 static inline void inet_sk_copy_descendant(struct sock *sk_to, 467 const struct sock *sk_from) 468 { 469 int ancestor_size = sizeof(struct inet_sock); 470 471 if (sk_from->sk_family == PF_INET6) 472 ancestor_size += sizeof(struct ipv6_pinfo); 473 474 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size); 475 } 476 477 #define __ipv6_only_sock(sk) (inet6_sk(sk)->ipv6only) 478 #define ipv6_only_sock(sk) ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk)) 479 480 static inline u16 inet6_tw_offset(const struct proto *prot) 481 { 482 return prot->twsk_prot->twsk_obj_size - 483 sizeof(struct inet6_timewait_sock); 484 } 485 486 static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk) 487 { 488 return likely(sk->sk_state != TCP_TIME_WAIT) ? 489 &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr; 490 } 491 492 static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk) 493 { 494 return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL; 495 } 496 497 static inline int inet_v6_ipv6only(const struct sock *sk) 498 { 499 return likely(sk->sk_state != TCP_TIME_WAIT) ? 500 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only; 501 } 502 #else 503 #define __ipv6_only_sock(sk) 0 504 #define ipv6_only_sock(sk) 0 505 506 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 507 { 508 return NULL; 509 } 510 511 static inline struct inet6_request_sock * 512 inet6_rsk(const struct request_sock *rsk) 513 { 514 return NULL; 515 } 516 517 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 518 { 519 return NULL; 520 } 521 522 #define __inet6_rcv_saddr(__sk) NULL 523 #define inet6_rcv_saddr(__sk) NULL 524 #define tcp_twsk_ipv6only(__sk) 0 525 #define inet_v6_ipv6only(__sk) 0 526 #endif /* IS_ENABLED(CONFIG_IPV6) */ 527 528 #define INET6_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif)\ 529 (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net) && \ 530 ((*((__portpair *)&(inet_sk(__sk)->inet_dport))) == (__ports)) && \ 531 ((__sk)->sk_family == AF_INET6) && \ 532 ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr)) && \ 533 ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \ 534 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif)))) 535 536 #define INET6_TW_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif) \ 537 (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net) && \ 538 (*((__portpair *)&(inet_twsk(__sk)->tw_dport)) == (__ports)) && \ 539 ((__sk)->sk_family == PF_INET6) && \ 540 (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_daddr, (__saddr))) && \ 541 (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_rcv_saddr, (__daddr))) && \ 542 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif)))) 543 544 #endif /* __KERNEL__ */ 545 546 #endif /* _IPV6_H */ 547