1 #ifndef _IPV6_H 2 #define _IPV6_H 3 4 #include <linux/in6.h> 5 #include <asm/byteorder.h> 6 7 /* The latest drafts declared increase in minimal mtu up to 1280. */ 8 9 #define IPV6_MIN_MTU 1280 10 11 /* 12 * Advanced API 13 * source interface/address selection, source routing, etc... 14 * *under construction* 15 */ 16 17 18 struct in6_pktinfo { 19 struct in6_addr ipi6_addr; 20 int ipi6_ifindex; 21 }; 22 23 24 struct in6_ifreq { 25 struct in6_addr ifr6_addr; 26 __u32 ifr6_prefixlen; 27 int ifr6_ifindex; 28 }; 29 30 #define IPV6_SRCRT_STRICT 0x01 /* Deprecated; will be removed */ 31 #define IPV6_SRCRT_TYPE_0 0 /* Deprecated; will be removed */ 32 #define IPV6_SRCRT_TYPE_2 2 /* IPv6 type 2 Routing Header */ 33 34 /* 35 * routing header 36 */ 37 struct ipv6_rt_hdr { 38 __u8 nexthdr; 39 __u8 hdrlen; 40 __u8 type; 41 __u8 segments_left; 42 43 /* 44 * type specific data 45 * variable length field 46 */ 47 }; 48 49 50 struct ipv6_opt_hdr { 51 __u8 nexthdr; 52 __u8 hdrlen; 53 /* 54 * TLV encoded option data follows. 55 */ 56 } __attribute__ ((packed)); /* required for some archs */ 57 58 #define ipv6_destopt_hdr ipv6_opt_hdr 59 #define ipv6_hopopt_hdr ipv6_opt_hdr 60 61 #ifdef __KERNEL__ 62 #define ipv6_optlen(p) (((p)->hdrlen+1) << 3) 63 #endif 64 65 /* 66 * routing header type 0 (used in cmsghdr struct) 67 */ 68 69 struct rt0_hdr { 70 struct ipv6_rt_hdr rt_hdr; 71 __u32 reserved; 72 struct in6_addr addr[0]; 73 74 #define rt0_type rt_hdr.type 75 }; 76 77 /* 78 * routing header type 2 79 */ 80 81 struct rt2_hdr { 82 struct ipv6_rt_hdr rt_hdr; 83 __u32 reserved; 84 struct in6_addr addr; 85 86 #define rt2_type rt_hdr.type 87 }; 88 89 /* 90 * home address option in destination options header 91 */ 92 93 struct ipv6_destopt_hao { 94 __u8 type; 95 __u8 length; 96 struct in6_addr addr; 97 } __attribute__ ((__packed__)); 98 99 /* 100 * IPv6 fixed header 101 * 102 * BEWARE, it is incorrect. The first 4 bits of flow_lbl 103 * are glued to priority now, forming "class". 104 */ 105 106 struct ipv6hdr { 107 #if defined(__LITTLE_ENDIAN_BITFIELD) 108 __u8 priority:4, 109 version:4; 110 #elif defined(__BIG_ENDIAN_BITFIELD) 111 __u8 version:4, 112 priority:4; 113 #else 114 #error "Please fix <asm/byteorder.h>" 115 #endif 116 __u8 flow_lbl[3]; 117 118 __be16 payload_len; 119 __u8 nexthdr; 120 __u8 hop_limit; 121 122 struct in6_addr saddr; 123 struct in6_addr daddr; 124 }; 125 126 #ifdef __KERNEL__ 127 /* 128 * This structure contains configuration options per IPv6 link. 129 */ 130 struct ipv6_devconf { 131 __s32 forwarding; 132 __s32 hop_limit; 133 __s32 mtu6; 134 __s32 accept_ra; 135 __s32 accept_redirects; 136 __s32 autoconf; 137 __s32 dad_transmits; 138 __s32 rtr_solicits; 139 __s32 rtr_solicit_interval; 140 __s32 rtr_solicit_delay; 141 __s32 force_mld_version; 142 #ifdef CONFIG_IPV6_PRIVACY 143 __s32 use_tempaddr; 144 __s32 temp_valid_lft; 145 __s32 temp_prefered_lft; 146 __s32 regen_max_retry; 147 __s32 max_desync_factor; 148 #endif 149 __s32 max_addresses; 150 __s32 accept_ra_defrtr; 151 __s32 accept_ra_pinfo; 152 #ifdef CONFIG_IPV6_ROUTER_PREF 153 __s32 accept_ra_rtr_pref; 154 __s32 rtr_probe_interval; 155 #ifdef CONFIG_IPV6_ROUTE_INFO 156 __s32 accept_ra_rt_info_max_plen; 157 #endif 158 #endif 159 __s32 proxy_ndp; 160 __s32 accept_source_route; 161 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 162 __s32 optimistic_dad; 163 #endif 164 #ifdef CONFIG_IPV6_MROUTE 165 __s32 mc_forwarding; 166 #endif 167 __s32 disable_ipv6; 168 __s32 accept_dad; 169 void *sysctl; 170 }; 171 #endif 172 173 /* index values for the variables in ipv6_devconf */ 174 enum { 175 DEVCONF_FORWARDING = 0, 176 DEVCONF_HOPLIMIT, 177 DEVCONF_MTU6, 178 DEVCONF_ACCEPT_RA, 179 DEVCONF_ACCEPT_REDIRECTS, 180 DEVCONF_AUTOCONF, 181 DEVCONF_DAD_TRANSMITS, 182 DEVCONF_RTR_SOLICITS, 183 DEVCONF_RTR_SOLICIT_INTERVAL, 184 DEVCONF_RTR_SOLICIT_DELAY, 185 DEVCONF_USE_TEMPADDR, 186 DEVCONF_TEMP_VALID_LFT, 187 DEVCONF_TEMP_PREFERED_LFT, 188 DEVCONF_REGEN_MAX_RETRY, 189 DEVCONF_MAX_DESYNC_FACTOR, 190 DEVCONF_MAX_ADDRESSES, 191 DEVCONF_FORCE_MLD_VERSION, 192 DEVCONF_ACCEPT_RA_DEFRTR, 193 DEVCONF_ACCEPT_RA_PINFO, 194 DEVCONF_ACCEPT_RA_RTR_PREF, 195 DEVCONF_RTR_PROBE_INTERVAL, 196 DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN, 197 DEVCONF_PROXY_NDP, 198 DEVCONF_OPTIMISTIC_DAD, 199 DEVCONF_ACCEPT_SOURCE_ROUTE, 200 DEVCONF_MC_FORWARDING, 201 DEVCONF_DISABLE_IPV6, 202 DEVCONF_ACCEPT_DAD, 203 DEVCONF_MAX 204 }; 205 206 #ifdef __KERNEL__ 207 #include <linux/icmpv6.h> 208 #include <linux/tcp.h> 209 #include <linux/udp.h> 210 211 #include <net/inet_sock.h> 212 213 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb) 214 { 215 return (struct ipv6hdr *)skb_network_header(skb); 216 } 217 218 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb) 219 { 220 return (struct ipv6hdr *)skb_transport_header(skb); 221 } 222 223 /* 224 This structure contains results of exthdrs parsing 225 as offsets from skb->nh. 226 */ 227 228 struct inet6_skb_parm { 229 int iif; 230 __u16 ra; 231 __u16 hop; 232 __u16 dst0; 233 __u16 srcrt; 234 __u16 dst1; 235 __u16 lastopt; 236 __u32 nhoff; 237 __u16 flags; 238 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 239 __u16 dsthao; 240 #endif 241 242 #define IP6SKB_XFRM_TRANSFORMED 1 243 #define IP6SKB_FORWARDED 2 244 }; 245 246 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb)) 247 248 static inline int inet6_iif(const struct sk_buff *skb) 249 { 250 return IP6CB(skb)->iif; 251 } 252 253 struct inet6_request_sock { 254 struct in6_addr loc_addr; 255 struct in6_addr rmt_addr; 256 struct sk_buff *pktopts; 257 int iif; 258 }; 259 260 struct tcp6_request_sock { 261 struct tcp_request_sock tcp6rsk_tcp; 262 struct inet6_request_sock tcp6rsk_inet6; 263 }; 264 265 struct ipv6_mc_socklist; 266 struct ipv6_ac_socklist; 267 struct ipv6_fl_socklist; 268 269 /** 270 * struct ipv6_pinfo - ipv6 private area 271 * 272 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc) 273 * this _must_ be the last member, so that inet6_sk_generic 274 * is able to calculate its offset from the base struct sock 275 * by using the struct proto->slab_obj_size member. -acme 276 */ 277 struct ipv6_pinfo { 278 struct in6_addr saddr; 279 struct in6_addr rcv_saddr; 280 struct in6_addr daddr; 281 struct in6_addr *daddr_cache; 282 #ifdef CONFIG_IPV6_SUBTREES 283 struct in6_addr *saddr_cache; 284 #endif 285 286 __be32 flow_label; 287 __u32 frag_size; 288 289 /* 290 * Packed in 16bits. 291 * Omit one shift by by putting the signed field at MSB. 292 */ 293 #if defined(__BIG_ENDIAN_BITFIELD) 294 __s16 hop_limit:9; 295 __u16 __unused_1:7; 296 #else 297 __u16 __unused_1:7; 298 __s16 hop_limit:9; 299 #endif 300 301 #if defined(__BIG_ENDIAN_BITFIELD) 302 /* Packed in 16bits. */ 303 __s16 mcast_hops:9; 304 __u16 __unused_2:6, 305 mc_loop:1; 306 #else 307 __u16 mc_loop:1, 308 __unused_2:6; 309 __s16 mcast_hops:9; 310 #endif 311 int mcast_oif; 312 313 /* pktoption flags */ 314 union { 315 struct { 316 __u16 srcrt:1, 317 osrcrt:1, 318 rxinfo:1, 319 rxoinfo:1, 320 rxhlim:1, 321 rxohlim:1, 322 hopopts:1, 323 ohopopts:1, 324 dstopts:1, 325 odstopts:1, 326 rxflow:1, 327 rxtclass:1; 328 } bits; 329 __u16 all; 330 } rxopt; 331 332 /* sockopt flags */ 333 __u8 recverr:1, 334 sndflow:1, 335 pmtudisc:2, 336 ipv6only:1, 337 srcprefs:3; /* 001: prefer temporary address 338 * 010: prefer public address 339 * 100: prefer care-of address 340 */ 341 __u8 tclass; 342 343 __u32 dst_cookie; 344 345 struct ipv6_mc_socklist *ipv6_mc_list; 346 struct ipv6_ac_socklist *ipv6_ac_list; 347 struct ipv6_fl_socklist *ipv6_fl_list; 348 349 struct ipv6_txoptions *opt; 350 struct sk_buff *pktoptions; 351 struct { 352 struct ipv6_txoptions *opt; 353 u8 hop_limit; 354 u8 tclass; 355 } cork; 356 }; 357 358 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */ 359 struct raw6_sock { 360 /* inet_sock has to be the first member of raw6_sock */ 361 struct inet_sock inet; 362 __u32 checksum; /* perform checksum */ 363 __u32 offset; /* checksum offset */ 364 struct icmp6_filter filter; 365 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */ 366 struct ipv6_pinfo inet6; 367 }; 368 369 struct udp6_sock { 370 struct udp_sock udp; 371 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */ 372 struct ipv6_pinfo inet6; 373 }; 374 375 struct tcp6_sock { 376 struct tcp_sock tcp; 377 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */ 378 struct ipv6_pinfo inet6; 379 }; 380 381 extern int inet6_sk_rebuild_header(struct sock *sk); 382 383 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 384 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 385 { 386 return inet_sk(__sk)->pinet6; 387 } 388 389 static inline struct inet6_request_sock * 390 inet6_rsk(const struct request_sock *rsk) 391 { 392 return (struct inet6_request_sock *)(((u8 *)rsk) + 393 inet_rsk(rsk)->inet6_rsk_offset); 394 } 395 396 static inline u32 inet6_rsk_offset(struct request_sock *rsk) 397 { 398 return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock); 399 } 400 401 static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops) 402 { 403 struct request_sock *req = reqsk_alloc(ops); 404 405 if (req != NULL) { 406 inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req); 407 inet6_rsk(req)->pktopts = NULL; 408 } 409 410 return req; 411 } 412 413 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 414 { 415 return (struct raw6_sock *)sk; 416 } 417 418 static inline void inet_sk_copy_descendant(struct sock *sk_to, 419 const struct sock *sk_from) 420 { 421 int ancestor_size = sizeof(struct inet_sock); 422 423 if (sk_from->sk_family == PF_INET6) 424 ancestor_size += sizeof(struct ipv6_pinfo); 425 426 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size); 427 } 428 429 #define __ipv6_only_sock(sk) (inet6_sk(sk)->ipv6only) 430 #define ipv6_only_sock(sk) ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk)) 431 432 struct inet6_timewait_sock { 433 struct in6_addr tw_v6_daddr; 434 struct in6_addr tw_v6_rcv_saddr; 435 }; 436 437 struct tcp6_timewait_sock { 438 struct tcp_timewait_sock tcp6tw_tcp; 439 struct inet6_timewait_sock tcp6tw_inet6; 440 }; 441 442 static inline u16 inet6_tw_offset(const struct proto *prot) 443 { 444 return prot->twsk_prot->twsk_obj_size - 445 sizeof(struct inet6_timewait_sock); 446 } 447 448 static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk) 449 { 450 return (struct inet6_timewait_sock *)(((u8 *)sk) + 451 inet_twsk(sk)->tw_ipv6_offset); 452 } 453 454 static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk) 455 { 456 return likely(sk->sk_state != TCP_TIME_WAIT) ? 457 &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr; 458 } 459 460 static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk) 461 { 462 return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL; 463 } 464 465 static inline int inet_v6_ipv6only(const struct sock *sk) 466 { 467 return likely(sk->sk_state != TCP_TIME_WAIT) ? 468 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only; 469 } 470 #else 471 #define __ipv6_only_sock(sk) 0 472 #define ipv6_only_sock(sk) 0 473 474 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 475 { 476 return NULL; 477 } 478 479 static inline struct inet6_request_sock * 480 inet6_rsk(const struct request_sock *rsk) 481 { 482 return NULL; 483 } 484 485 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 486 { 487 return NULL; 488 } 489 490 #define __inet6_rcv_saddr(__sk) NULL 491 #define inet6_rcv_saddr(__sk) NULL 492 #define tcp_twsk_ipv6only(__sk) 0 493 #define inet_v6_ipv6only(__sk) 0 494 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */ 495 496 #define INET6_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif)\ 497 (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net) && \ 498 ((*((__portpair *)&(inet_sk(__sk)->dport))) == (__ports)) && \ 499 ((__sk)->sk_family == AF_INET6) && \ 500 ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr)) && \ 501 ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \ 502 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif)))) 503 504 #define INET6_TW_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif) \ 505 (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net) && \ 506 (*((__portpair *)&(inet_twsk(__sk)->tw_dport)) == (__ports)) && \ 507 ((__sk)->sk_family == PF_INET6) && \ 508 (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_daddr, (__saddr))) && \ 509 (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_rcv_saddr, (__daddr))) && \ 510 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif)))) 511 512 #endif /* __KERNEL__ */ 513 514 #endif /* _IPV6_H */ 515