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 /* 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 */ 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 void *sysctl; 181 }; 182 183 /* index values for the variables in ipv6_devconf */ 184 enum { 185 DEVCONF_FORWARDING = 0, 186 DEVCONF_HOPLIMIT, 187 DEVCONF_MTU6, 188 DEVCONF_ACCEPT_RA, 189 DEVCONF_ACCEPT_REDIRECTS, 190 DEVCONF_AUTOCONF, 191 DEVCONF_DAD_TRANSMITS, 192 DEVCONF_RTR_SOLICITS, 193 DEVCONF_RTR_SOLICIT_INTERVAL, 194 DEVCONF_RTR_SOLICIT_DELAY, 195 DEVCONF_USE_TEMPADDR, 196 DEVCONF_TEMP_VALID_LFT, 197 DEVCONF_TEMP_PREFERED_LFT, 198 DEVCONF_REGEN_MAX_RETRY, 199 DEVCONF_MAX_DESYNC_FACTOR, 200 DEVCONF_MAX_ADDRESSES, 201 DEVCONF_FORCE_MLD_VERSION, 202 DEVCONF_ACCEPT_RA_DEFRTR, 203 DEVCONF_ACCEPT_RA_PINFO, 204 DEVCONF_ACCEPT_RA_RTR_PREF, 205 DEVCONF_RTR_PROBE_INTERVAL, 206 DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN, 207 DEVCONF_PROXY_NDP, 208 DEVCONF_MAX 209 }; 210 211 #ifdef __KERNEL__ 212 #include <linux/icmpv6.h> 213 #include <linux/tcp.h> 214 #include <linux/udp.h> 215 216 #include <net/if_inet6.h> /* struct ipv6_mc_socklist */ 217 #include <net/inet_sock.h> 218 219 /* 220 This structure contains results of exthdrs parsing 221 as offsets from skb->nh. 222 */ 223 224 struct inet6_skb_parm { 225 int iif; 226 __u16 ra; 227 __u16 hop; 228 __u16 dst0; 229 __u16 srcrt; 230 __u16 dst1; 231 __u16 lastopt; 232 __u32 nhoff; 233 __u16 flags; 234 #ifdef CONFIG_IPV6_MIP6 235 __u16 dsthao; 236 #endif 237 238 #define IP6SKB_XFRM_TRANSFORMED 1 239 }; 240 241 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb)) 242 243 static inline int inet6_iif(const struct sk_buff *skb) 244 { 245 return IP6CB(skb)->iif; 246 } 247 248 struct inet6_request_sock { 249 struct in6_addr loc_addr; 250 struct in6_addr rmt_addr; 251 struct sk_buff *pktopts; 252 int iif; 253 }; 254 255 struct tcp6_request_sock { 256 struct tcp_request_sock tcp6rsk_tcp; 257 struct inet6_request_sock tcp6rsk_inet6; 258 }; 259 260 /** 261 * struct ipv6_pinfo - ipv6 private area 262 * 263 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc) 264 * this _must_ be the last member, so that inet6_sk_generic 265 * is able to calculate its offset from the base struct sock 266 * by using the struct proto->slab_obj_size member. -acme 267 */ 268 struct ipv6_pinfo { 269 struct in6_addr saddr; 270 struct in6_addr rcv_saddr; 271 struct in6_addr daddr; 272 struct in6_addr *daddr_cache; 273 #ifdef CONFIG_IPV6_SUBTREES 274 struct in6_addr *saddr_cache; 275 #endif 276 277 __be32 flow_label; 278 __u32 frag_size; 279 __s16 hop_limit; 280 __s16 mcast_hops; 281 int mcast_oif; 282 283 /* pktoption flags */ 284 union { 285 struct { 286 __u16 srcrt:2, 287 osrcrt:2, 288 rxinfo:1, 289 rxoinfo:1, 290 rxhlim:1, 291 rxohlim:1, 292 hopopts:1, 293 ohopopts:1, 294 dstopts:1, 295 odstopts:1, 296 rxflow:1, 297 rxtclass:1; 298 } bits; 299 __u16 all; 300 } rxopt; 301 302 /* sockopt flags */ 303 __u8 mc_loop:1, 304 recverr:1, 305 sndflow:1, 306 pmtudisc:2, 307 ipv6only:1; 308 __u8 tclass; 309 310 __u32 dst_cookie; 311 312 struct ipv6_mc_socklist *ipv6_mc_list; 313 struct ipv6_ac_socklist *ipv6_ac_list; 314 struct ipv6_fl_socklist *ipv6_fl_list; 315 316 struct ipv6_txoptions *opt; 317 struct sk_buff *pktoptions; 318 struct { 319 struct ipv6_txoptions *opt; 320 struct rt6_info *rt; 321 int hop_limit; 322 int tclass; 323 } cork; 324 }; 325 326 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */ 327 struct raw6_sock { 328 /* inet_sock has to be the first member of raw6_sock */ 329 struct inet_sock inet; 330 __u32 checksum; /* perform checksum */ 331 __u32 offset; /* checksum offset */ 332 struct icmp6_filter filter; 333 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */ 334 struct ipv6_pinfo inet6; 335 }; 336 337 struct udp6_sock { 338 struct udp_sock udp; 339 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */ 340 struct ipv6_pinfo inet6; 341 }; 342 343 struct tcp6_sock { 344 struct tcp_sock tcp; 345 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */ 346 struct ipv6_pinfo inet6; 347 }; 348 349 extern int inet6_sk_rebuild_header(struct sock *sk); 350 351 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 352 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 353 { 354 return inet_sk(__sk)->pinet6; 355 } 356 357 static inline struct inet6_request_sock * 358 inet6_rsk(const struct request_sock *rsk) 359 { 360 return (struct inet6_request_sock *)(((u8 *)rsk) + 361 inet_rsk(rsk)->inet6_rsk_offset); 362 } 363 364 static inline u32 inet6_rsk_offset(struct request_sock *rsk) 365 { 366 return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock); 367 } 368 369 static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops) 370 { 371 struct request_sock *req = reqsk_alloc(ops); 372 373 if (req != NULL) 374 inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req); 375 376 return req; 377 } 378 379 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 380 { 381 return (struct raw6_sock *)sk; 382 } 383 384 static inline void inet_sk_copy_descendant(struct sock *sk_to, 385 const struct sock *sk_from) 386 { 387 int ancestor_size = sizeof(struct inet_sock); 388 389 if (sk_from->sk_family == PF_INET6) 390 ancestor_size += sizeof(struct ipv6_pinfo); 391 392 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size); 393 } 394 395 #define __ipv6_only_sock(sk) (inet6_sk(sk)->ipv6only) 396 #define ipv6_only_sock(sk) ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk)) 397 398 struct inet6_timewait_sock { 399 struct in6_addr tw_v6_daddr; 400 struct in6_addr tw_v6_rcv_saddr; 401 }; 402 403 struct tcp6_timewait_sock { 404 struct tcp_timewait_sock tcp6tw_tcp; 405 struct inet6_timewait_sock tcp6tw_inet6; 406 }; 407 408 static inline u16 inet6_tw_offset(const struct proto *prot) 409 { 410 return prot->twsk_prot->twsk_obj_size - 411 sizeof(struct inet6_timewait_sock); 412 } 413 414 static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk) 415 { 416 return (struct inet6_timewait_sock *)(((u8 *)sk) + 417 inet_twsk(sk)->tw_ipv6_offset); 418 } 419 420 static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk) 421 { 422 return likely(sk->sk_state != TCP_TIME_WAIT) ? 423 &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr; 424 } 425 426 static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk) 427 { 428 return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL; 429 } 430 431 static inline int inet_v6_ipv6only(const struct sock *sk) 432 { 433 return likely(sk->sk_state != TCP_TIME_WAIT) ? 434 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only; 435 } 436 #else 437 #define __ipv6_only_sock(sk) 0 438 #define ipv6_only_sock(sk) 0 439 440 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 441 { 442 return NULL; 443 } 444 445 static inline struct inet6_request_sock * 446 inet6_rsk(const struct request_sock *rsk) 447 { 448 return NULL; 449 } 450 451 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 452 { 453 return NULL; 454 } 455 456 #define __inet6_rcv_saddr(__sk) NULL 457 #define inet6_rcv_saddr(__sk) NULL 458 #define tcp_twsk_ipv6only(__sk) 0 459 #define inet_v6_ipv6only(__sk) 0 460 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */ 461 462 #define INET6_MATCH(__sk, __hash, __saddr, __daddr, __ports, __dif)\ 463 (((__sk)->sk_hash == (__hash)) && \ 464 ((*((__portpair *)&(inet_sk(__sk)->dport))) == (__ports)) && \ 465 ((__sk)->sk_family == AF_INET6) && \ 466 ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr)) && \ 467 ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \ 468 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif)))) 469 470 #endif /* __KERNEL__ */ 471 472 #endif /* _IPV6_H */ 473