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