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 /* 127 * This structure contains configuration options per IPv6 link. 128 */ 129 struct ipv6_devconf { 130 __s32 forwarding; 131 __s32 hop_limit; 132 __s32 mtu6; 133 __s32 accept_ra; 134 __s32 accept_redirects; 135 __s32 autoconf; 136 __s32 dad_transmits; 137 __s32 rtr_solicits; 138 __s32 rtr_solicit_interval; 139 __s32 rtr_solicit_delay; 140 __s32 force_mld_version; 141 #ifdef CONFIG_IPV6_PRIVACY 142 __s32 use_tempaddr; 143 __s32 temp_valid_lft; 144 __s32 temp_prefered_lft; 145 __s32 regen_max_retry; 146 __s32 max_desync_factor; 147 #endif 148 __s32 max_addresses; 149 __s32 accept_ra_defrtr; 150 __s32 accept_ra_pinfo; 151 #ifdef CONFIG_IPV6_ROUTER_PREF 152 __s32 accept_ra_rtr_pref; 153 __s32 rtr_probe_interval; 154 #ifdef CONFIG_IPV6_ROUTE_INFO 155 __s32 accept_ra_rt_info_max_plen; 156 #endif 157 #endif 158 __s32 proxy_ndp; 159 __s32 accept_source_route; 160 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 161 __s32 optimistic_dad; 162 #endif 163 #ifdef CONFIG_IPV6_MROUTE 164 __s32 mc_forwarding; 165 #endif 166 __s32 disable_ipv6; 167 __s32 accept_dad; 168 void *sysctl; 169 }; 170 171 /* index values for the variables in ipv6_devconf */ 172 enum { 173 DEVCONF_FORWARDING = 0, 174 DEVCONF_HOPLIMIT, 175 DEVCONF_MTU6, 176 DEVCONF_ACCEPT_RA, 177 DEVCONF_ACCEPT_REDIRECTS, 178 DEVCONF_AUTOCONF, 179 DEVCONF_DAD_TRANSMITS, 180 DEVCONF_RTR_SOLICITS, 181 DEVCONF_RTR_SOLICIT_INTERVAL, 182 DEVCONF_RTR_SOLICIT_DELAY, 183 DEVCONF_USE_TEMPADDR, 184 DEVCONF_TEMP_VALID_LFT, 185 DEVCONF_TEMP_PREFERED_LFT, 186 DEVCONF_REGEN_MAX_RETRY, 187 DEVCONF_MAX_DESYNC_FACTOR, 188 DEVCONF_MAX_ADDRESSES, 189 DEVCONF_FORCE_MLD_VERSION, 190 DEVCONF_ACCEPT_RA_DEFRTR, 191 DEVCONF_ACCEPT_RA_PINFO, 192 DEVCONF_ACCEPT_RA_RTR_PREF, 193 DEVCONF_RTR_PROBE_INTERVAL, 194 DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN, 195 DEVCONF_PROXY_NDP, 196 DEVCONF_OPTIMISTIC_DAD, 197 DEVCONF_ACCEPT_SOURCE_ROUTE, 198 DEVCONF_MC_FORWARDING, 199 DEVCONF_DISABLE_IPV6, 200 DEVCONF_ACCEPT_DAD, 201 DEVCONF_MAX 202 }; 203 204 #ifdef __KERNEL__ 205 #include <linux/icmpv6.h> 206 #include <linux/tcp.h> 207 #include <linux/udp.h> 208 209 #include <net/inet_sock.h> 210 211 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb) 212 { 213 return (struct ipv6hdr *)skb_network_header(skb); 214 } 215 216 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb) 217 { 218 return (struct ipv6hdr *)skb_transport_header(skb); 219 } 220 221 /* 222 This structure contains results of exthdrs parsing 223 as offsets from skb->nh. 224 */ 225 226 struct inet6_skb_parm { 227 int iif; 228 __u16 ra; 229 __u16 hop; 230 __u16 dst0; 231 __u16 srcrt; 232 __u16 dst1; 233 __u16 lastopt; 234 __u32 nhoff; 235 __u16 flags; 236 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 237 __u16 dsthao; 238 #endif 239 240 #define IP6SKB_XFRM_TRANSFORMED 1 241 #define IP6SKB_FORWARDED 2 242 }; 243 244 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb)) 245 246 static inline int inet6_iif(const struct sk_buff *skb) 247 { 248 return IP6CB(skb)->iif; 249 } 250 251 struct inet6_request_sock { 252 struct in6_addr loc_addr; 253 struct in6_addr rmt_addr; 254 struct sk_buff *pktopts; 255 int iif; 256 }; 257 258 struct tcp6_request_sock { 259 struct tcp_request_sock tcp6rsk_tcp; 260 struct inet6_request_sock tcp6rsk_inet6; 261 }; 262 263 struct ipv6_mc_socklist; 264 struct ipv6_ac_socklist; 265 struct ipv6_fl_socklist; 266 267 /** 268 * struct ipv6_pinfo - ipv6 private area 269 * 270 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc) 271 * this _must_ be the last member, so that inet6_sk_generic 272 * is able to calculate its offset from the base struct sock 273 * by using the struct proto->slab_obj_size member. -acme 274 */ 275 struct ipv6_pinfo { 276 struct in6_addr saddr; 277 struct in6_addr rcv_saddr; 278 struct in6_addr daddr; 279 struct in6_addr *daddr_cache; 280 #ifdef CONFIG_IPV6_SUBTREES 281 struct in6_addr *saddr_cache; 282 #endif 283 284 __be32 flow_label; 285 __u32 frag_size; 286 287 /* 288 * Packed in 16bits. 289 * Omit one shift by by putting the signed field at MSB. 290 */ 291 #if defined(__BIG_ENDIAN_BITFIELD) 292 __s16 hop_limit:9; 293 __u16 __unused_1:7; 294 #else 295 __u16 __unused_1:7; 296 __s16 hop_limit:9; 297 #endif 298 299 #if defined(__BIG_ENDIAN_BITFIELD) 300 /* Packed in 16bits. */ 301 __s16 mcast_hops:9; 302 __u16 __unused_2:6, 303 mc_loop:1; 304 #else 305 __u16 mc_loop:1, 306 __unused_2:6; 307 __s16 mcast_hops:9; 308 #endif 309 int mcast_oif; 310 311 /* pktoption flags */ 312 union { 313 struct { 314 __u16 srcrt:1, 315 osrcrt:1, 316 rxinfo:1, 317 rxoinfo:1, 318 rxhlim:1, 319 rxohlim:1, 320 hopopts:1, 321 ohopopts:1, 322 dstopts:1, 323 odstopts:1, 324 rxflow:1, 325 rxtclass:1; 326 } bits; 327 __u16 all; 328 } rxopt; 329 330 /* sockopt flags */ 331 __u8 recverr:1, 332 sndflow:1, 333 pmtudisc:2, 334 ipv6only:1, 335 srcprefs:3; /* 001: prefer temporary address 336 * 010: prefer public address 337 * 100: prefer care-of address 338 */ 339 __u8 tclass; 340 341 __u32 dst_cookie; 342 343 struct ipv6_mc_socklist *ipv6_mc_list; 344 struct ipv6_ac_socklist *ipv6_ac_list; 345 struct ipv6_fl_socklist *ipv6_fl_list; 346 347 struct ipv6_txoptions *opt; 348 struct sk_buff *pktoptions; 349 struct { 350 struct ipv6_txoptions *opt; 351 u8 hop_limit; 352 u8 tclass; 353 } cork; 354 }; 355 356 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */ 357 struct raw6_sock { 358 /* inet_sock has to be the first member of raw6_sock */ 359 struct inet_sock inet; 360 __u32 checksum; /* perform checksum */ 361 __u32 offset; /* checksum offset */ 362 struct icmp6_filter filter; 363 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */ 364 struct ipv6_pinfo inet6; 365 }; 366 367 struct udp6_sock { 368 struct udp_sock udp; 369 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */ 370 struct ipv6_pinfo inet6; 371 }; 372 373 struct tcp6_sock { 374 struct tcp_sock tcp; 375 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */ 376 struct ipv6_pinfo inet6; 377 }; 378 379 extern int inet6_sk_rebuild_header(struct sock *sk); 380 381 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 382 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 383 { 384 return inet_sk(__sk)->pinet6; 385 } 386 387 static inline struct inet6_request_sock * 388 inet6_rsk(const struct request_sock *rsk) 389 { 390 return (struct inet6_request_sock *)(((u8 *)rsk) + 391 inet_rsk(rsk)->inet6_rsk_offset); 392 } 393 394 static inline u32 inet6_rsk_offset(struct request_sock *rsk) 395 { 396 return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock); 397 } 398 399 static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops) 400 { 401 struct request_sock *req = reqsk_alloc(ops); 402 403 if (req != NULL) { 404 inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req); 405 inet6_rsk(req)->pktopts = NULL; 406 } 407 408 return req; 409 } 410 411 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 412 { 413 return (struct raw6_sock *)sk; 414 } 415 416 static inline void inet_sk_copy_descendant(struct sock *sk_to, 417 const struct sock *sk_from) 418 { 419 int ancestor_size = sizeof(struct inet_sock); 420 421 if (sk_from->sk_family == PF_INET6) 422 ancestor_size += sizeof(struct ipv6_pinfo); 423 424 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size); 425 } 426 427 #define __ipv6_only_sock(sk) (inet6_sk(sk)->ipv6only) 428 #define ipv6_only_sock(sk) ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk)) 429 430 struct inet6_timewait_sock { 431 struct in6_addr tw_v6_daddr; 432 struct in6_addr tw_v6_rcv_saddr; 433 }; 434 435 struct tcp6_timewait_sock { 436 struct tcp_timewait_sock tcp6tw_tcp; 437 struct inet6_timewait_sock tcp6tw_inet6; 438 }; 439 440 static inline u16 inet6_tw_offset(const struct proto *prot) 441 { 442 return prot->twsk_prot->twsk_obj_size - 443 sizeof(struct inet6_timewait_sock); 444 } 445 446 static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk) 447 { 448 return (struct inet6_timewait_sock *)(((u8 *)sk) + 449 inet_twsk(sk)->tw_ipv6_offset); 450 } 451 452 static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk) 453 { 454 return likely(sk->sk_state != TCP_TIME_WAIT) ? 455 &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr; 456 } 457 458 static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk) 459 { 460 return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL; 461 } 462 463 static inline int inet_v6_ipv6only(const struct sock *sk) 464 { 465 return likely(sk->sk_state != TCP_TIME_WAIT) ? 466 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only; 467 } 468 #else 469 #define __ipv6_only_sock(sk) 0 470 #define ipv6_only_sock(sk) 0 471 472 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 473 { 474 return NULL; 475 } 476 477 static inline struct inet6_request_sock * 478 inet6_rsk(const struct request_sock *rsk) 479 { 480 return NULL; 481 } 482 483 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 484 { 485 return NULL; 486 } 487 488 #define __inet6_rcv_saddr(__sk) NULL 489 #define inet6_rcv_saddr(__sk) NULL 490 #define tcp_twsk_ipv6only(__sk) 0 491 #define inet_v6_ipv6only(__sk) 0 492 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */ 493 494 #define INET6_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif)\ 495 (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net) && \ 496 ((*((__portpair *)&(inet_sk(__sk)->dport))) == (__ports)) && \ 497 ((__sk)->sk_family == AF_INET6) && \ 498 ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr)) && \ 499 ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \ 500 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif)))) 501 502 #define INET6_TW_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif) \ 503 (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net) && \ 504 (*((__portpair *)&(inet_twsk(__sk)->tw_dport)) == (__ports)) && \ 505 ((__sk)->sk_family == PF_INET6) && \ 506 (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_daddr, (__saddr))) && \ 507 (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_rcv_saddr, (__daddr))) && \ 508 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif)))) 509 510 #endif /* __KERNEL__ */ 511 512 #endif /* _IPV6_H */ 513