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 #endif 173 174 /* index values for the variables in ipv6_devconf */ 175 enum { 176 DEVCONF_FORWARDING = 0, 177 DEVCONF_HOPLIMIT, 178 DEVCONF_MTU6, 179 DEVCONF_ACCEPT_RA, 180 DEVCONF_ACCEPT_REDIRECTS, 181 DEVCONF_AUTOCONF, 182 DEVCONF_DAD_TRANSMITS, 183 DEVCONF_RTR_SOLICITS, 184 DEVCONF_RTR_SOLICIT_INTERVAL, 185 DEVCONF_RTR_SOLICIT_DELAY, 186 DEVCONF_USE_TEMPADDR, 187 DEVCONF_TEMP_VALID_LFT, 188 DEVCONF_TEMP_PREFERED_LFT, 189 DEVCONF_REGEN_MAX_RETRY, 190 DEVCONF_MAX_DESYNC_FACTOR, 191 DEVCONF_MAX_ADDRESSES, 192 DEVCONF_FORCE_MLD_VERSION, 193 DEVCONF_ACCEPT_RA_DEFRTR, 194 DEVCONF_ACCEPT_RA_PINFO, 195 DEVCONF_ACCEPT_RA_RTR_PREF, 196 DEVCONF_RTR_PROBE_INTERVAL, 197 DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN, 198 DEVCONF_PROXY_NDP, 199 DEVCONF_OPTIMISTIC_DAD, 200 DEVCONF_ACCEPT_SOURCE_ROUTE, 201 DEVCONF_MC_FORWARDING, 202 DEVCONF_DISABLE_IPV6, 203 DEVCONF_ACCEPT_DAD, 204 DEVCONF_MAX 205 }; 206 207 #ifdef __KERNEL__ 208 #include <linux/icmpv6.h> 209 #include <linux/tcp.h> 210 #include <linux/udp.h> 211 212 #include <net/inet_sock.h> 213 214 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb) 215 { 216 return (struct ipv6hdr *)skb_network_header(skb); 217 } 218 219 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb) 220 { 221 return (struct ipv6hdr *)skb_transport_header(skb); 222 } 223 224 /* 225 This structure contains results of exthdrs parsing 226 as offsets from skb->nh. 227 */ 228 229 struct inet6_skb_parm { 230 int iif; 231 __u16 ra; 232 __u16 hop; 233 __u16 dst0; 234 __u16 srcrt; 235 __u16 dst1; 236 __u16 lastopt; 237 __u32 nhoff; 238 __u16 flags; 239 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 240 __u16 dsthao; 241 #endif 242 243 #define IP6SKB_XFRM_TRANSFORMED 1 244 #define IP6SKB_FORWARDED 2 245 }; 246 247 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb)) 248 249 static inline int inet6_iif(const struct sk_buff *skb) 250 { 251 return IP6CB(skb)->iif; 252 } 253 254 struct inet6_request_sock { 255 struct in6_addr loc_addr; 256 struct in6_addr rmt_addr; 257 struct sk_buff *pktopts; 258 int iif; 259 }; 260 261 struct tcp6_request_sock { 262 struct tcp_request_sock tcp6rsk_tcp; 263 struct inet6_request_sock tcp6rsk_inet6; 264 }; 265 266 struct ipv6_mc_socklist; 267 struct ipv6_ac_socklist; 268 struct ipv6_fl_socklist; 269 270 /** 271 * struct ipv6_pinfo - ipv6 private area 272 * 273 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc) 274 * this _must_ be the last member, so that inet6_sk_generic 275 * is able to calculate its offset from the base struct sock 276 * by using the struct proto->slab_obj_size member. -acme 277 */ 278 struct ipv6_pinfo { 279 struct in6_addr saddr; 280 struct in6_addr rcv_saddr; 281 struct in6_addr daddr; 282 struct in6_pktinfo sticky_pktinfo; 283 struct in6_addr *daddr_cache; 284 #ifdef CONFIG_IPV6_SUBTREES 285 struct in6_addr *saddr_cache; 286 #endif 287 288 __be32 flow_label; 289 __u32 frag_size; 290 291 /* 292 * Packed in 16bits. 293 * Omit one shift by by putting the signed field at MSB. 294 */ 295 #if defined(__BIG_ENDIAN_BITFIELD) 296 __s16 hop_limit:9; 297 __u16 __unused_1:7; 298 #else 299 __u16 __unused_1:7; 300 __s16 hop_limit:9; 301 #endif 302 303 #if defined(__BIG_ENDIAN_BITFIELD) 304 /* Packed in 16bits. */ 305 __s16 mcast_hops:9; 306 __u16 __unused_2:6, 307 mc_loop:1; 308 #else 309 __u16 mc_loop:1, 310 __unused_2:6; 311 __s16 mcast_hops:9; 312 #endif 313 int mcast_oif; 314 315 /* pktoption flags */ 316 union { 317 struct { 318 __u16 srcrt:1, 319 osrcrt:1, 320 rxinfo:1, 321 rxoinfo:1, 322 rxhlim:1, 323 rxohlim:1, 324 hopopts:1, 325 ohopopts:1, 326 dstopts:1, 327 odstopts:1, 328 rxflow:1, 329 rxtclass:1; 330 } bits; 331 __u16 all; 332 } rxopt; 333 334 /* sockopt flags */ 335 __u8 recverr:1, 336 sndflow:1, 337 pmtudisc:2, 338 ipv6only:1, 339 srcprefs:3; /* 001: prefer temporary address 340 * 010: prefer public address 341 * 100: prefer care-of address 342 */ 343 __u8 tclass; 344 345 __u32 dst_cookie; 346 347 struct ipv6_mc_socklist *ipv6_mc_list; 348 struct ipv6_ac_socklist *ipv6_ac_list; 349 struct ipv6_fl_socklist *ipv6_fl_list; 350 351 struct ipv6_txoptions *opt; 352 struct sk_buff *pktoptions; 353 struct { 354 struct ipv6_txoptions *opt; 355 u8 hop_limit; 356 u8 tclass; 357 } cork; 358 }; 359 360 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */ 361 struct raw6_sock { 362 /* inet_sock has to be the first member of raw6_sock */ 363 struct inet_sock inet; 364 __u32 checksum; /* perform checksum */ 365 __u32 offset; /* checksum offset */ 366 struct icmp6_filter filter; 367 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */ 368 struct ipv6_pinfo inet6; 369 }; 370 371 struct udp6_sock { 372 struct udp_sock udp; 373 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */ 374 struct ipv6_pinfo inet6; 375 }; 376 377 struct tcp6_sock { 378 struct tcp_sock tcp; 379 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */ 380 struct ipv6_pinfo inet6; 381 }; 382 383 extern int inet6_sk_rebuild_header(struct sock *sk); 384 385 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 386 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 387 { 388 return inet_sk(__sk)->pinet6; 389 } 390 391 static inline struct inet6_request_sock * 392 inet6_rsk(const struct request_sock *rsk) 393 { 394 return (struct inet6_request_sock *)(((u8 *)rsk) + 395 inet_rsk(rsk)->inet6_rsk_offset); 396 } 397 398 static inline u32 inet6_rsk_offset(struct request_sock *rsk) 399 { 400 return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock); 401 } 402 403 static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops) 404 { 405 struct request_sock *req = reqsk_alloc(ops); 406 407 if (req != NULL) { 408 inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req); 409 inet6_rsk(req)->pktopts = NULL; 410 } 411 412 return req; 413 } 414 415 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 416 { 417 return (struct raw6_sock *)sk; 418 } 419 420 static inline void inet_sk_copy_descendant(struct sock *sk_to, 421 const struct sock *sk_from) 422 { 423 int ancestor_size = sizeof(struct inet_sock); 424 425 if (sk_from->sk_family == PF_INET6) 426 ancestor_size += sizeof(struct ipv6_pinfo); 427 428 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size); 429 } 430 431 #define __ipv6_only_sock(sk) (inet6_sk(sk)->ipv6only) 432 #define ipv6_only_sock(sk) ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk)) 433 434 struct inet6_timewait_sock { 435 struct in6_addr tw_v6_daddr; 436 struct in6_addr tw_v6_rcv_saddr; 437 }; 438 439 struct tcp6_timewait_sock { 440 struct tcp_timewait_sock tcp6tw_tcp; 441 struct inet6_timewait_sock tcp6tw_inet6; 442 }; 443 444 static inline u16 inet6_tw_offset(const struct proto *prot) 445 { 446 return prot->twsk_prot->twsk_obj_size - 447 sizeof(struct inet6_timewait_sock); 448 } 449 450 static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk) 451 { 452 return (struct inet6_timewait_sock *)(((u8 *)sk) + 453 inet_twsk(sk)->tw_ipv6_offset); 454 } 455 456 static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk) 457 { 458 return likely(sk->sk_state != TCP_TIME_WAIT) ? 459 &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr; 460 } 461 462 static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk) 463 { 464 return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL; 465 } 466 467 static inline int inet_v6_ipv6only(const struct sock *sk) 468 { 469 return likely(sk->sk_state != TCP_TIME_WAIT) ? 470 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only; 471 } 472 #else 473 #define __ipv6_only_sock(sk) 0 474 #define ipv6_only_sock(sk) 0 475 476 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 477 { 478 return NULL; 479 } 480 481 static inline struct inet6_request_sock * 482 inet6_rsk(const struct request_sock *rsk) 483 { 484 return NULL; 485 } 486 487 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 488 { 489 return NULL; 490 } 491 492 #define __inet6_rcv_saddr(__sk) NULL 493 #define inet6_rcv_saddr(__sk) NULL 494 #define tcp_twsk_ipv6only(__sk) 0 495 #define inet_v6_ipv6only(__sk) 0 496 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */ 497 498 #define INET6_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif)\ 499 (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net) && \ 500 ((*((__portpair *)&(inet_sk(__sk)->dport))) == (__ports)) && \ 501 ((__sk)->sk_family == AF_INET6) && \ 502 ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr)) && \ 503 ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \ 504 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif)))) 505 506 #define INET6_TW_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif) \ 507 (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net) && \ 508 (*((__portpair *)&(inet_twsk(__sk)->tw_dport)) == (__ports)) && \ 509 ((__sk)->sk_family == PF_INET6) && \ 510 (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_daddr, (__saddr))) && \ 511 (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_rcv_saddr, (__daddr))) && \ 512 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif)))) 513 514 #endif /* __KERNEL__ */ 515 516 #endif /* _IPV6_H */ 517