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 18struct in6_pktinfo { 19 struct in6_addr ipi6_addr; 20 int ipi6_ifindex; 21}; 22 23 24struct in6_ifreq { 25 struct in6_addr ifr6_addr; 26 __u32 ifr6_prefixlen; 27 int ifr6_ifindex; 28}; 29 30#define IPV6_SRCRT_STRICT 0x01 /* this hop must be a neighbor */ 31#define IPV6_SRCRT_TYPE_0 0 /* IPv6 type 0 Routing Header */ 32#define IPV6_SRCRT_TYPE_2 2 /* IPv6 type 2 Routing Header */ 33 34/* 35 * routing header 36 */ 37struct 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 50struct ipv6_opt_hdr { 51 __u8 nexthdr; 52 __u8 hdrlen; 53 /* 54 * TLV encoded option data follows. 55 */ 56}; 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 69struct 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 81struct 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 93struct ipv6_destopt_hao { 94 __u8 type; 95 __u8 length; 96 struct in6_addr addr; 97} __attribute__ ((__packed__)); 98 99struct ipv6_auth_hdr { 100 __u8 nexthdr; 101 __u8 hdrlen; /* This one is measured in 32 bit units! */ 102 __be16 reserved; 103 __be32 spi; 104 __be32 seq_no; /* Sequence number */ 105 __u8 auth_data[0]; /* Length variable but >=4. Mind the 64 bit alignment! */ 106}; 107 108struct ipv6_esp_hdr { 109 __be32 spi; 110 __be32 seq_no; /* Sequence number */ 111 __u8 enc_data[0]; /* Length variable but >=8. Mind the 64 bit alignment! */ 112}; 113 114struct ipv6_comp_hdr { 115 __u8 nexthdr; 116 __u8 flags; 117 __be16 cpi; 118}; 119 120/* 121 * IPv6 fixed header 122 * 123 * BEWARE, it is incorrect. The first 4 bits of flow_lbl 124 * are glued to priority now, forming "class". 125 */ 126 127struct ipv6hdr { 128#if defined(__LITTLE_ENDIAN_BITFIELD) 129 __u8 priority:4, 130 version:4; 131#elif defined(__BIG_ENDIAN_BITFIELD) 132 __u8 version:4, 133 priority:4; 134#else 135#error "Please fix <asm/byteorder.h>" 136#endif 137 __u8 flow_lbl[3]; 138 139 __be16 payload_len; 140 __u8 nexthdr; 141 __u8 hop_limit; 142 143 struct in6_addr saddr; 144 struct in6_addr daddr; 145}; 146 147/* 148 * This structure contains configuration options per IPv6 link. 149 */ 150struct ipv6_devconf { 151 __s32 forwarding; 152 __s32 hop_limit; 153 __s32 mtu6; 154 __s32 accept_ra; 155 __s32 accept_redirects; 156 __s32 autoconf; 157 __s32 dad_transmits; 158 __s32 rtr_solicits; 159 __s32 rtr_solicit_interval; 160 __s32 rtr_solicit_delay; 161 __s32 force_mld_version; 162#ifdef CONFIG_IPV6_PRIVACY 163 __s32 use_tempaddr; 164 __s32 temp_valid_lft; 165 __s32 temp_prefered_lft; 166 __s32 regen_max_retry; 167 __s32 max_desync_factor; 168#endif 169 __s32 max_addresses; 170 __s32 accept_ra_defrtr; 171 __s32 accept_ra_pinfo; 172#ifdef CONFIG_IPV6_ROUTER_PREF 173 __s32 accept_ra_rtr_pref; 174 __s32 rtr_probe_interval; 175#ifdef CONFIG_IPV6_ROUTE_INFO 176 __s32 accept_ra_rt_info_max_plen; 177#endif 178#endif 179 __s32 proxy_ndp; 180 __s32 accept_source_route; 181#ifdef CONFIG_IPV6_OPTIMISTIC_DAD 182 __s32 optimistic_dad; 183#endif 184#ifdef CONFIG_IPV6_MROUTE 185 __s32 mc_forwarding; 186#endif 187 void *sysctl; 188}; 189 190/* index values for the variables in ipv6_devconf */ 191enum { 192 DEVCONF_FORWARDING = 0, 193 DEVCONF_HOPLIMIT, 194 DEVCONF_MTU6, 195 DEVCONF_ACCEPT_RA, 196 DEVCONF_ACCEPT_REDIRECTS, 197 DEVCONF_AUTOCONF, 198 DEVCONF_DAD_TRANSMITS, 199 DEVCONF_RTR_SOLICITS, 200 DEVCONF_RTR_SOLICIT_INTERVAL, 201 DEVCONF_RTR_SOLICIT_DELAY, 202 DEVCONF_USE_TEMPADDR, 203 DEVCONF_TEMP_VALID_LFT, 204 DEVCONF_TEMP_PREFERED_LFT, 205 DEVCONF_REGEN_MAX_RETRY, 206 DEVCONF_MAX_DESYNC_FACTOR, 207 DEVCONF_MAX_ADDRESSES, 208 DEVCONF_FORCE_MLD_VERSION, 209 DEVCONF_ACCEPT_RA_DEFRTR, 210 DEVCONF_ACCEPT_RA_PINFO, 211 DEVCONF_ACCEPT_RA_RTR_PREF, 212 DEVCONF_RTR_PROBE_INTERVAL, 213 DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN, 214 DEVCONF_PROXY_NDP, 215 DEVCONF_OPTIMISTIC_DAD, 216 DEVCONF_ACCEPT_SOURCE_ROUTE, 217#ifdef CONFIG_IPV6_MROUTE 218 DEVCONF_MCFORWARDING, 219#endif 220 DEVCONF_MAX 221}; 222 223#ifdef __KERNEL__ 224#include <linux/icmpv6.h> 225#include <linux/tcp.h> 226#include <linux/udp.h> 227 228#include <net/if_inet6.h> /* struct ipv6_mc_socklist */ 229#include <net/inet_sock.h> 230 231static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb) 232{ 233 return (struct ipv6hdr *)skb_network_header(skb); 234} 235 236static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb) 237{ 238 return (struct ipv6hdr *)skb_transport_header(skb); 239} 240 241/* 242 This structure contains results of exthdrs parsing 243 as offsets from skb->nh. 244 */ 245 246struct inet6_skb_parm { 247 int iif; 248 __u16 ra; 249 __u16 hop; 250 __u16 dst0; 251 __u16 srcrt; 252 __u16 dst1; 253 __u16 lastopt; 254 __u32 nhoff; 255 __u16 flags; 256#ifdef CONFIG_IPV6_MIP6 257 __u16 dsthao; 258#endif 259 260#define IP6SKB_XFRM_TRANSFORMED 1 261}; 262 263#define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb)) 264 265static inline int inet6_iif(const struct sk_buff *skb) 266{ 267 return IP6CB(skb)->iif; 268} 269 270struct inet6_request_sock { 271 struct in6_addr loc_addr; 272 struct in6_addr rmt_addr; 273 struct sk_buff *pktopts; 274 int iif; 275}; 276 277struct tcp6_request_sock { 278 struct tcp_request_sock tcp6rsk_tcp; 279 struct inet6_request_sock tcp6rsk_inet6; 280}; 281 282/** 283 * struct ipv6_pinfo - ipv6 private area 284 * 285 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc) 286 * this _must_ be the last member, so that inet6_sk_generic 287 * is able to calculate its offset from the base struct sock 288 * by using the struct proto->slab_obj_size member. -acme 289 */ 290struct ipv6_pinfo { 291 struct in6_addr saddr; 292 struct in6_addr rcv_saddr; 293 struct in6_addr daddr; 294 struct in6_addr *daddr_cache; 295#ifdef CONFIG_IPV6_SUBTREES 296 struct in6_addr *saddr_cache; 297#endif 298 299 __be32 flow_label; 300 __u32 frag_size; 301 __s16 hop_limit; 302 __s16 mcast_hops; 303 int mcast_oif; 304 305 /* pktoption flags */ 306 union { 307 struct { 308 __u16 srcrt:2, 309 osrcrt:2, 310 rxinfo:1, 311 rxoinfo:1, 312 rxhlim:1, 313 rxohlim:1, 314 hopopts:1, 315 ohopopts:1, 316 dstopts:1, 317 odstopts:1, 318 rxflow:1, 319 rxtclass:1; 320 } bits; 321 __u16 all; 322 } rxopt; 323 324 /* sockopt flags */ 325 __u8 mc_loop:1, 326 recverr:1, 327 sndflow:1, 328 pmtudisc:2, 329 ipv6only:1; 330 __u8 tclass; 331 332 __u32 dst_cookie; 333 334 struct ipv6_mc_socklist *ipv6_mc_list; 335 struct ipv6_ac_socklist *ipv6_ac_list; 336 struct ipv6_fl_socklist *ipv6_fl_list; 337 338 struct ipv6_txoptions *opt; 339 struct sk_buff *pktoptions; 340 struct { 341 struct ipv6_txoptions *opt; 342 struct rt6_info *rt; 343 int hop_limit; 344 int tclass; 345 } cork; 346}; 347 348/* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */ 349struct raw6_sock { 350 /* inet_sock has to be the first member of raw6_sock */ 351 struct inet_sock inet; 352 __u32 checksum; /* perform checksum */ 353 __u32 offset; /* checksum offset */ 354 struct icmp6_filter filter; 355 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */ 356 struct ipv6_pinfo inet6; 357}; 358 359struct udp6_sock { 360 struct udp_sock udp; 361 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */ 362 struct ipv6_pinfo inet6; 363}; 364 365struct tcp6_sock { 366 struct tcp_sock tcp; 367 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */ 368 struct ipv6_pinfo inet6; 369}; 370 371extern int inet6_sk_rebuild_header(struct sock *sk); 372 373#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 374static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 375{ 376 return inet_sk(__sk)->pinet6; 377} 378 379static inline struct inet6_request_sock * 380 inet6_rsk(const struct request_sock *rsk) 381{ 382 return (struct inet6_request_sock *)(((u8 *)rsk) + 383 inet_rsk(rsk)->inet6_rsk_offset); 384} 385 386static inline u32 inet6_rsk_offset(struct request_sock *rsk) 387{ 388 return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock); 389} 390 391static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops) 392{ 393 struct request_sock *req = reqsk_alloc(ops); 394 395 if (req != NULL) 396 inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req); 397 398 return req; 399} 400 401static inline struct raw6_sock *raw6_sk(const struct sock *sk) 402{ 403 return (struct raw6_sock *)sk; 404} 405 406static inline void inet_sk_copy_descendant(struct sock *sk_to, 407 const struct sock *sk_from) 408{ 409 int ancestor_size = sizeof(struct inet_sock); 410 411 if (sk_from->sk_family == PF_INET6) 412 ancestor_size += sizeof(struct ipv6_pinfo); 413 414 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size); 415} 416 417#define __ipv6_only_sock(sk) (inet6_sk(sk)->ipv6only) 418#define ipv6_only_sock(sk) ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk)) 419 420struct inet6_timewait_sock { 421 struct in6_addr tw_v6_daddr; 422 struct in6_addr tw_v6_rcv_saddr; 423}; 424 425struct tcp6_timewait_sock { 426 struct tcp_timewait_sock tcp6tw_tcp; 427 struct inet6_timewait_sock tcp6tw_inet6; 428}; 429 430static inline u16 inet6_tw_offset(const struct proto *prot) 431{ 432 return prot->twsk_prot->twsk_obj_size - 433 sizeof(struct inet6_timewait_sock); 434} 435 436static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk) 437{ 438 return (struct inet6_timewait_sock *)(((u8 *)sk) + 439 inet_twsk(sk)->tw_ipv6_offset); 440} 441 442static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk) 443{ 444 return likely(sk->sk_state != TCP_TIME_WAIT) ? 445 &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr; 446} 447 448static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk) 449{ 450 return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL; 451} 452 453static inline int inet_v6_ipv6only(const struct sock *sk) 454{ 455 return likely(sk->sk_state != TCP_TIME_WAIT) ? 456 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only; 457} 458#else 459#define __ipv6_only_sock(sk) 0 460#define ipv6_only_sock(sk) 0 461 462static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 463{ 464 return NULL; 465} 466 467static inline struct inet6_request_sock * 468 inet6_rsk(const struct request_sock *rsk) 469{ 470 return NULL; 471} 472 473static inline struct raw6_sock *raw6_sk(const struct sock *sk) 474{ 475 return NULL; 476} 477 478#define __inet6_rcv_saddr(__sk) NULL 479#define inet6_rcv_saddr(__sk) NULL 480#define tcp_twsk_ipv6only(__sk) 0 481#define inet_v6_ipv6only(__sk) 0 482#endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */ 483 484#define INET6_MATCH(__sk, __hash, __saddr, __daddr, __ports, __dif)\ 485 (((__sk)->sk_hash == (__hash)) && \ 486 ((*((__portpair *)&(inet_sk(__sk)->dport))) == (__ports)) && \ 487 ((__sk)->sk_family == AF_INET6) && \ 488 ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr)) && \ 489 ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \ 490 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif)))) 491 492#endif /* __KERNEL__ */ 493 494#endif /* _IPV6_H */ 495