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 }; 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 struct 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 }; 107 108 struct 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 }; 113 114 struct 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 */ 126 127 struct 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 */ 150 struct 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 void *sysctl; 185 }; 186 187 /* index values for the variables in ipv6_devconf */ 188 enum { 189 DEVCONF_FORWARDING = 0, 190 DEVCONF_HOPLIMIT, 191 DEVCONF_MTU6, 192 DEVCONF_ACCEPT_RA, 193 DEVCONF_ACCEPT_REDIRECTS, 194 DEVCONF_AUTOCONF, 195 DEVCONF_DAD_TRANSMITS, 196 DEVCONF_RTR_SOLICITS, 197 DEVCONF_RTR_SOLICIT_INTERVAL, 198 DEVCONF_RTR_SOLICIT_DELAY, 199 DEVCONF_USE_TEMPADDR, 200 DEVCONF_TEMP_VALID_LFT, 201 DEVCONF_TEMP_PREFERED_LFT, 202 DEVCONF_REGEN_MAX_RETRY, 203 DEVCONF_MAX_DESYNC_FACTOR, 204 DEVCONF_MAX_ADDRESSES, 205 DEVCONF_FORCE_MLD_VERSION, 206 DEVCONF_ACCEPT_RA_DEFRTR, 207 DEVCONF_ACCEPT_RA_PINFO, 208 DEVCONF_ACCEPT_RA_RTR_PREF, 209 DEVCONF_RTR_PROBE_INTERVAL, 210 DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN, 211 DEVCONF_PROXY_NDP, 212 DEVCONF_OPTIMISTIC_DAD, 213 DEVCONF_ACCEPT_SOURCE_ROUTE, 214 DEVCONF_MAX 215 }; 216 217 #ifdef __KERNEL__ 218 #include <linux/icmpv6.h> 219 #include <linux/tcp.h> 220 #include <linux/udp.h> 221 222 #include <net/if_inet6.h> /* struct ipv6_mc_socklist */ 223 #include <net/inet_sock.h> 224 225 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb) 226 { 227 return (struct ipv6hdr *)skb_network_header(skb); 228 } 229 230 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb) 231 { 232 return (struct ipv6hdr *)skb_transport_header(skb); 233 } 234 235 /* 236 This structure contains results of exthdrs parsing 237 as offsets from skb->nh. 238 */ 239 240 struct inet6_skb_parm { 241 int iif; 242 __u16 ra; 243 __u16 hop; 244 __u16 dst0; 245 __u16 srcrt; 246 __u16 dst1; 247 __u16 lastopt; 248 __u32 nhoff; 249 __u16 flags; 250 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 251 __u16 dsthao; 252 #endif 253 254 #define IP6SKB_XFRM_TRANSFORMED 1 255 }; 256 257 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb)) 258 259 static inline int inet6_iif(const struct sk_buff *skb) 260 { 261 return IP6CB(skb)->iif; 262 } 263 264 struct inet6_request_sock { 265 struct in6_addr loc_addr; 266 struct in6_addr rmt_addr; 267 struct sk_buff *pktopts; 268 int iif; 269 }; 270 271 struct tcp6_request_sock { 272 struct tcp_request_sock tcp6rsk_tcp; 273 struct inet6_request_sock tcp6rsk_inet6; 274 }; 275 276 /** 277 * struct ipv6_pinfo - ipv6 private area 278 * 279 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc) 280 * this _must_ be the last member, so that inet6_sk_generic 281 * is able to calculate its offset from the base struct sock 282 * by using the struct proto->slab_obj_size member. -acme 283 */ 284 struct ipv6_pinfo { 285 struct in6_addr saddr; 286 struct in6_addr rcv_saddr; 287 struct in6_addr daddr; 288 struct in6_addr *daddr_cache; 289 #ifdef CONFIG_IPV6_SUBTREES 290 struct in6_addr *saddr_cache; 291 #endif 292 293 __be32 flow_label; 294 __u32 frag_size; 295 __s16 hop_limit; 296 __s16 mcast_hops; 297 int mcast_oif; 298 299 /* pktoption flags */ 300 union { 301 struct { 302 __u16 srcrt:1, 303 osrcrt:1, 304 rxinfo:1, 305 rxoinfo:1, 306 rxhlim:1, 307 rxohlim:1, 308 hopopts:1, 309 ohopopts:1, 310 dstopts:1, 311 odstopts:1, 312 rxflow:1, 313 rxtclass:1; 314 } bits; 315 __u16 all; 316 } rxopt; 317 318 /* sockopt flags */ 319 __u8 mc_loop:1, 320 recverr:1, 321 sndflow:1, 322 pmtudisc:2, 323 ipv6only:1; 324 __u8 tclass; 325 326 __u32 dst_cookie; 327 328 struct ipv6_mc_socklist *ipv6_mc_list; 329 struct ipv6_ac_socklist *ipv6_ac_list; 330 struct ipv6_fl_socklist *ipv6_fl_list; 331 332 struct ipv6_txoptions *opt; 333 struct sk_buff *pktoptions; 334 struct { 335 struct ipv6_txoptions *opt; 336 struct rt6_info *rt; 337 int hop_limit; 338 int tclass; 339 } cork; 340 }; 341 342 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */ 343 struct raw6_sock { 344 /* inet_sock has to be the first member of raw6_sock */ 345 struct inet_sock inet; 346 __u32 checksum; /* perform checksum */ 347 __u32 offset; /* checksum offset */ 348 struct icmp6_filter filter; 349 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */ 350 struct ipv6_pinfo inet6; 351 }; 352 353 struct udp6_sock { 354 struct udp_sock udp; 355 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */ 356 struct ipv6_pinfo inet6; 357 }; 358 359 struct tcp6_sock { 360 struct tcp_sock tcp; 361 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */ 362 struct ipv6_pinfo inet6; 363 }; 364 365 extern int inet6_sk_rebuild_header(struct sock *sk); 366 367 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 368 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 369 { 370 return inet_sk(__sk)->pinet6; 371 } 372 373 static inline struct inet6_request_sock * 374 inet6_rsk(const struct request_sock *rsk) 375 { 376 return (struct inet6_request_sock *)(((u8 *)rsk) + 377 inet_rsk(rsk)->inet6_rsk_offset); 378 } 379 380 static inline u32 inet6_rsk_offset(struct request_sock *rsk) 381 { 382 return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock); 383 } 384 385 static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops) 386 { 387 struct request_sock *req = reqsk_alloc(ops); 388 389 if (req != NULL) 390 inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req); 391 392 return req; 393 } 394 395 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 396 { 397 return (struct raw6_sock *)sk; 398 } 399 400 static inline void inet_sk_copy_descendant(struct sock *sk_to, 401 const struct sock *sk_from) 402 { 403 int ancestor_size = sizeof(struct inet_sock); 404 405 if (sk_from->sk_family == PF_INET6) 406 ancestor_size += sizeof(struct ipv6_pinfo); 407 408 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size); 409 } 410 411 #define __ipv6_only_sock(sk) (inet6_sk(sk)->ipv6only) 412 #define ipv6_only_sock(sk) ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk)) 413 414 struct inet6_timewait_sock { 415 struct in6_addr tw_v6_daddr; 416 struct in6_addr tw_v6_rcv_saddr; 417 }; 418 419 struct tcp6_timewait_sock { 420 struct tcp_timewait_sock tcp6tw_tcp; 421 struct inet6_timewait_sock tcp6tw_inet6; 422 }; 423 424 static inline u16 inet6_tw_offset(const struct proto *prot) 425 { 426 return prot->twsk_prot->twsk_obj_size - 427 sizeof(struct inet6_timewait_sock); 428 } 429 430 static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk) 431 { 432 return (struct inet6_timewait_sock *)(((u8 *)sk) + 433 inet_twsk(sk)->tw_ipv6_offset); 434 } 435 436 static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk) 437 { 438 return likely(sk->sk_state != TCP_TIME_WAIT) ? 439 &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr; 440 } 441 442 static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk) 443 { 444 return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL; 445 } 446 447 static inline int inet_v6_ipv6only(const struct sock *sk) 448 { 449 return likely(sk->sk_state != TCP_TIME_WAIT) ? 450 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only; 451 } 452 #else 453 #define __ipv6_only_sock(sk) 0 454 #define ipv6_only_sock(sk) 0 455 456 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 457 { 458 return NULL; 459 } 460 461 static inline struct inet6_request_sock * 462 inet6_rsk(const struct request_sock *rsk) 463 { 464 return NULL; 465 } 466 467 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 468 { 469 return NULL; 470 } 471 472 #define __inet6_rcv_saddr(__sk) NULL 473 #define inet6_rcv_saddr(__sk) NULL 474 #define tcp_twsk_ipv6only(__sk) 0 475 #define inet_v6_ipv6only(__sk) 0 476 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */ 477 478 #define INET6_MATCH(__sk, __hash, __saddr, __daddr, __ports, __dif)\ 479 (((__sk)->sk_hash == (__hash)) && \ 480 ((*((__portpair *)&(inet_sk(__sk)->dport))) == (__ports)) && \ 481 ((__sk)->sk_family == AF_INET6) && \ 482 ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr)) && \ 483 ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \ 484 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif)))) 485 486 #endif /* __KERNEL__ */ 487 488 #endif /* _IPV6_H */ 489