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 25 struct in6_ifreq { 26 struct in6_addr ifr6_addr; 27 __u32 ifr6_prefixlen; 28 int ifr6_ifindex; 29 }; 30 31 #define IPV6_SRCRT_STRICT 0x01 /* Deprecated; will be removed */ 32 #define IPV6_SRCRT_TYPE_0 0 /* Deprecated; will be removed */ 33 #define IPV6_SRCRT_TYPE_2 2 /* IPv6 type 2 Routing Header */ 34 35 /* 36 * routing header 37 */ 38 struct ipv6_rt_hdr { 39 __u8 nexthdr; 40 __u8 hdrlen; 41 __u8 type; 42 __u8 segments_left; 43 44 /* 45 * type specific data 46 * variable length field 47 */ 48 }; 49 50 51 struct ipv6_opt_hdr { 52 __u8 nexthdr; 53 __u8 hdrlen; 54 /* 55 * TLV encoded option data follows. 56 */ 57 } __attribute__ ((packed)); /* required for some archs */ 58 59 #define ipv6_destopt_hdr ipv6_opt_hdr 60 #define ipv6_hopopt_hdr ipv6_opt_hdr 61 62 #ifdef __KERNEL__ 63 #define ipv6_optlen(p) (((p)->hdrlen+1) << 3) 64 #endif 65 66 /* 67 * routing header type 0 (used in cmsghdr struct) 68 */ 69 70 struct rt0_hdr { 71 struct ipv6_rt_hdr rt_hdr; 72 __u32 reserved; 73 struct in6_addr addr[0]; 74 75 #define rt0_type rt_hdr.type 76 }; 77 78 /* 79 * routing header type 2 80 */ 81 82 struct rt2_hdr { 83 struct ipv6_rt_hdr rt_hdr; 84 __u32 reserved; 85 struct in6_addr addr; 86 87 #define rt2_type rt_hdr.type 88 }; 89 90 /* 91 * home address option in destination options header 92 */ 93 94 struct ipv6_destopt_hao { 95 __u8 type; 96 __u8 length; 97 struct in6_addr addr; 98 } __attribute__ ((__packed__)); 99 100 /* 101 * IPv6 fixed header 102 * 103 * BEWARE, it is incorrect. The first 4 bits of flow_lbl 104 * are glued to priority now, forming "class". 105 */ 106 107 struct ipv6hdr { 108 #if defined(__LITTLE_ENDIAN_BITFIELD) 109 __u8 priority:4, 110 version:4; 111 #elif defined(__BIG_ENDIAN_BITFIELD) 112 __u8 version:4, 113 priority:4; 114 #else 115 #error "Please fix <asm/byteorder.h>" 116 #endif 117 __u8 flow_lbl[3]; 118 119 __be16 payload_len; 120 __u8 nexthdr; 121 __u8 hop_limit; 122 123 struct in6_addr saddr; 124 struct in6_addr daddr; 125 }; 126 127 #ifdef __KERNEL__ 128 /* 129 * This structure contains configuration options per IPv6 link. 130 */ 131 struct ipv6_devconf { 132 __s32 forwarding; 133 __s32 hop_limit; 134 __s32 mtu6; 135 __s32 accept_ra; 136 __s32 accept_redirects; 137 __s32 autoconf; 138 __s32 dad_transmits; 139 __s32 rtr_solicits; 140 __s32 rtr_solicit_interval; 141 __s32 rtr_solicit_delay; 142 __s32 force_mld_version; 143 #ifdef CONFIG_IPV6_PRIVACY 144 __s32 use_tempaddr; 145 __s32 temp_valid_lft; 146 __s32 temp_prefered_lft; 147 __s32 regen_max_retry; 148 __s32 max_desync_factor; 149 #endif 150 __s32 max_addresses; 151 __s32 accept_ra_defrtr; 152 __s32 accept_ra_pinfo; 153 #ifdef CONFIG_IPV6_ROUTER_PREF 154 __s32 accept_ra_rtr_pref; 155 __s32 rtr_probe_interval; 156 #ifdef CONFIG_IPV6_ROUTE_INFO 157 __s32 accept_ra_rt_info_max_plen; 158 #endif 159 #endif 160 __s32 proxy_ndp; 161 __s32 accept_source_route; 162 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 163 __s32 optimistic_dad; 164 #endif 165 #ifdef CONFIG_IPV6_MROUTE 166 __s32 mc_forwarding; 167 #endif 168 __s32 disable_ipv6; 169 __s32 accept_dad; 170 void *sysctl; 171 }; 172 173 struct ipv6_params { 174 __s32 disable_ipv6; 175 __s32 autoconf; 176 }; 177 extern struct ipv6_params ipv6_defaults; 178 #endif 179 180 /* index values for the variables in ipv6_devconf */ 181 enum { 182 DEVCONF_FORWARDING = 0, 183 DEVCONF_HOPLIMIT, 184 DEVCONF_MTU6, 185 DEVCONF_ACCEPT_RA, 186 DEVCONF_ACCEPT_REDIRECTS, 187 DEVCONF_AUTOCONF, 188 DEVCONF_DAD_TRANSMITS, 189 DEVCONF_RTR_SOLICITS, 190 DEVCONF_RTR_SOLICIT_INTERVAL, 191 DEVCONF_RTR_SOLICIT_DELAY, 192 DEVCONF_USE_TEMPADDR, 193 DEVCONF_TEMP_VALID_LFT, 194 DEVCONF_TEMP_PREFERED_LFT, 195 DEVCONF_REGEN_MAX_RETRY, 196 DEVCONF_MAX_DESYNC_FACTOR, 197 DEVCONF_MAX_ADDRESSES, 198 DEVCONF_FORCE_MLD_VERSION, 199 DEVCONF_ACCEPT_RA_DEFRTR, 200 DEVCONF_ACCEPT_RA_PINFO, 201 DEVCONF_ACCEPT_RA_RTR_PREF, 202 DEVCONF_RTR_PROBE_INTERVAL, 203 DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN, 204 DEVCONF_PROXY_NDP, 205 DEVCONF_OPTIMISTIC_DAD, 206 DEVCONF_ACCEPT_SOURCE_ROUTE, 207 DEVCONF_MC_FORWARDING, 208 DEVCONF_DISABLE_IPV6, 209 DEVCONF_ACCEPT_DAD, 210 DEVCONF_MAX 211 }; 212 213 #ifdef __KERNEL__ 214 #include <linux/icmpv6.h> 215 #include <linux/tcp.h> 216 #include <linux/udp.h> 217 218 #include <net/inet_sock.h> 219 220 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb) 221 { 222 return (struct ipv6hdr *)skb_network_header(skb); 223 } 224 225 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb) 226 { 227 return (struct ipv6hdr *)skb_transport_header(skb); 228 } 229 230 /* 231 This structure contains results of exthdrs parsing 232 as offsets from skb->nh. 233 */ 234 235 struct inet6_skb_parm { 236 int iif; 237 __u16 ra; 238 __u16 hop; 239 __u16 dst0; 240 __u16 srcrt; 241 __u16 dst1; 242 __u16 lastopt; 243 __u32 nhoff; 244 __u16 flags; 245 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 246 __u16 dsthao; 247 #endif 248 249 #define IP6SKB_XFRM_TRANSFORMED 1 250 #define IP6SKB_FORWARDED 2 251 }; 252 253 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb)) 254 255 static inline int inet6_iif(const struct sk_buff *skb) 256 { 257 return IP6CB(skb)->iif; 258 } 259 260 struct inet6_request_sock { 261 struct in6_addr loc_addr; 262 struct in6_addr rmt_addr; 263 struct sk_buff *pktopts; 264 int iif; 265 }; 266 267 struct tcp6_request_sock { 268 struct tcp_request_sock tcp6rsk_tcp; 269 struct inet6_request_sock tcp6rsk_inet6; 270 }; 271 272 struct ipv6_mc_socklist; 273 struct ipv6_ac_socklist; 274 struct ipv6_fl_socklist; 275 276 /** 277 * struct ipv6_pinfo - ipv6 private area 278 * 279 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc) 280 * this _must_ be the last member, so that inet6_sk_generic 281 * is able to calculate its offset from the base struct sock 282 * by using the struct proto->slab_obj_size member. -acme 283 */ 284 struct ipv6_pinfo { 285 struct in6_addr saddr; 286 struct in6_addr rcv_saddr; 287 struct in6_addr daddr; 288 struct in6_pktinfo sticky_pktinfo; 289 struct in6_addr *daddr_cache; 290 #ifdef CONFIG_IPV6_SUBTREES 291 struct in6_addr *saddr_cache; 292 #endif 293 294 __be32 flow_label; 295 __u32 frag_size; 296 297 /* 298 * Packed in 16bits. 299 * Omit one shift by by putting the signed field at MSB. 300 */ 301 #if defined(__BIG_ENDIAN_BITFIELD) 302 __s16 hop_limit:9; 303 __u16 __unused_1:7; 304 #else 305 __u16 __unused_1:7; 306 __s16 hop_limit:9; 307 #endif 308 309 #if defined(__BIG_ENDIAN_BITFIELD) 310 /* Packed in 16bits. */ 311 __s16 mcast_hops:9; 312 __u16 __unused_2:6, 313 mc_loop:1; 314 #else 315 __u16 mc_loop:1, 316 __unused_2:6; 317 __s16 mcast_hops:9; 318 #endif 319 int mcast_oif; 320 321 /* pktoption flags */ 322 union { 323 struct { 324 __u16 srcrt:1, 325 osrcrt:1, 326 rxinfo:1, 327 rxoinfo:1, 328 rxhlim:1, 329 rxohlim:1, 330 hopopts:1, 331 ohopopts:1, 332 dstopts:1, 333 odstopts:1, 334 rxflow:1, 335 rxtclass:1; 336 } bits; 337 __u16 all; 338 } rxopt; 339 340 /* sockopt flags */ 341 __u8 recverr:1, 342 sndflow:1, 343 pmtudisc:2, 344 ipv6only:1, 345 srcprefs:3; /* 001: prefer temporary address 346 * 010: prefer public address 347 * 100: prefer care-of address 348 */ 349 __u8 tclass; 350 351 __u32 dst_cookie; 352 353 struct ipv6_mc_socklist *ipv6_mc_list; 354 struct ipv6_ac_socklist *ipv6_ac_list; 355 struct ipv6_fl_socklist *ipv6_fl_list; 356 357 struct ipv6_txoptions *opt; 358 struct sk_buff *pktoptions; 359 struct { 360 struct ipv6_txoptions *opt; 361 u8 hop_limit; 362 u8 tclass; 363 } cork; 364 }; 365 366 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */ 367 struct raw6_sock { 368 /* inet_sock has to be the first member of raw6_sock */ 369 struct inet_sock inet; 370 __u32 checksum; /* perform checksum */ 371 __u32 offset; /* checksum offset */ 372 struct icmp6_filter filter; 373 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */ 374 struct ipv6_pinfo inet6; 375 }; 376 377 struct udp6_sock { 378 struct udp_sock udp; 379 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */ 380 struct ipv6_pinfo inet6; 381 }; 382 383 struct tcp6_sock { 384 struct tcp_sock tcp; 385 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */ 386 struct ipv6_pinfo inet6; 387 }; 388 389 extern int inet6_sk_rebuild_header(struct sock *sk); 390 391 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 392 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 393 { 394 return inet_sk(__sk)->pinet6; 395 } 396 397 static inline struct inet6_request_sock * 398 inet6_rsk(const struct request_sock *rsk) 399 { 400 return (struct inet6_request_sock *)(((u8 *)rsk) + 401 inet_rsk(rsk)->inet6_rsk_offset); 402 } 403 404 static inline u32 inet6_rsk_offset(struct request_sock *rsk) 405 { 406 return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock); 407 } 408 409 static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops) 410 { 411 struct request_sock *req = reqsk_alloc(ops); 412 413 if (req != NULL) { 414 inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req); 415 inet6_rsk(req)->pktopts = NULL; 416 } 417 418 return req; 419 } 420 421 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 422 { 423 return (struct raw6_sock *)sk; 424 } 425 426 static inline void inet_sk_copy_descendant(struct sock *sk_to, 427 const struct sock *sk_from) 428 { 429 int ancestor_size = sizeof(struct inet_sock); 430 431 if (sk_from->sk_family == PF_INET6) 432 ancestor_size += sizeof(struct ipv6_pinfo); 433 434 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size); 435 } 436 437 #define __ipv6_only_sock(sk) (inet6_sk(sk)->ipv6only) 438 #define ipv6_only_sock(sk) ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk)) 439 440 struct inet6_timewait_sock { 441 struct in6_addr tw_v6_daddr; 442 struct in6_addr tw_v6_rcv_saddr; 443 }; 444 445 struct tcp6_timewait_sock { 446 struct tcp_timewait_sock tcp6tw_tcp; 447 struct inet6_timewait_sock tcp6tw_inet6; 448 }; 449 450 static inline u16 inet6_tw_offset(const struct proto *prot) 451 { 452 return prot->twsk_prot->twsk_obj_size - 453 sizeof(struct inet6_timewait_sock); 454 } 455 456 static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk) 457 { 458 return (struct inet6_timewait_sock *)(((u8 *)sk) + 459 inet_twsk(sk)->tw_ipv6_offset); 460 } 461 462 static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk) 463 { 464 return likely(sk->sk_state != TCP_TIME_WAIT) ? 465 &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr; 466 } 467 468 static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk) 469 { 470 return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL; 471 } 472 473 static inline int inet_v6_ipv6only(const struct sock *sk) 474 { 475 return likely(sk->sk_state != TCP_TIME_WAIT) ? 476 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only; 477 } 478 #else 479 #define __ipv6_only_sock(sk) 0 480 #define ipv6_only_sock(sk) 0 481 482 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 483 { 484 return NULL; 485 } 486 487 static inline struct inet6_request_sock * 488 inet6_rsk(const struct request_sock *rsk) 489 { 490 return NULL; 491 } 492 493 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 494 { 495 return NULL; 496 } 497 498 #define __inet6_rcv_saddr(__sk) NULL 499 #define inet6_rcv_saddr(__sk) NULL 500 #define tcp_twsk_ipv6only(__sk) 0 501 #define inet_v6_ipv6only(__sk) 0 502 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */ 503 504 #define INET6_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif)\ 505 (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net) && \ 506 ((*((__portpair *)&(inet_sk(__sk)->dport))) == (__ports)) && \ 507 ((__sk)->sk_family == AF_INET6) && \ 508 ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr)) && \ 509 ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \ 510 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif)))) 511 512 #define INET6_TW_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif) \ 513 (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net) && \ 514 (*((__portpair *)&(inet_twsk(__sk)->tw_dport)) == (__ports)) && \ 515 ((__sk)->sk_family == PF_INET6) && \ 516 (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_daddr, (__saddr))) && \ 517 (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_rcv_saddr, (__daddr))) && \ 518 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif)))) 519 520 #endif /* __KERNEL__ */ 521 522 #endif /* _IPV6_H */ 523