1 #ifndef _IPV6_H 2 #define _IPV6_H 3 4 #include <linux/config.h> 5 #include <linux/in6.h> 6 #include <asm/byteorder.h> 7 8 /* The latest drafts declared increase in minimal mtu up to 1280. */ 9 10 #define IPV6_MIN_MTU 1280 11 12 /* 13 * Advanced API 14 * source interface/address selection, source routing, etc... 15 * *under construction* 16 */ 17 18 19 struct in6_pktinfo { 20 struct in6_addr ipi6_addr; 21 int ipi6_ifindex; 22 }; 23 24 25 struct in6_ifreq { 26 struct in6_addr ifr6_addr; 27 __u32 ifr6_prefixlen; 28 int ifr6_ifindex; 29 }; 30 31 #define IPV6_SRCRT_STRICT 0x01 /* this hop must be a neighbor */ 32 #define IPV6_SRCRT_TYPE_0 0 /* IPv6 type 0 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 struct ipv6_auth_hdr { 78 __u8 nexthdr; 79 __u8 hdrlen; /* This one is measured in 32 bit units! */ 80 __u16 reserved; 81 __u32 spi; 82 __u32 seq_no; /* Sequence number */ 83 __u8 auth_data[0]; /* Length variable but >=4. Mind the 64 bit alignment! */ 84 }; 85 86 struct ipv6_esp_hdr { 87 __u32 spi; 88 __u32 seq_no; /* Sequence number */ 89 __u8 enc_data[0]; /* Length variable but >=8. Mind the 64 bit alignment! */ 90 }; 91 92 struct ipv6_comp_hdr { 93 __u8 nexthdr; 94 __u8 flags; 95 __u16 cpi; 96 }; 97 98 /* 99 * IPv6 fixed header 100 * 101 * BEWARE, it is incorrect. The first 4 bits of flow_lbl 102 * are glued to priority now, forming "class". 103 */ 104 105 struct ipv6hdr { 106 #if defined(__LITTLE_ENDIAN_BITFIELD) 107 __u8 priority:4, 108 version:4; 109 #elif defined(__BIG_ENDIAN_BITFIELD) 110 __u8 version:4, 111 priority:4; 112 #else 113 #error "Please fix <asm/byteorder.h>" 114 #endif 115 __u8 flow_lbl[3]; 116 117 __u16 payload_len; 118 __u8 nexthdr; 119 __u8 hop_limit; 120 121 struct in6_addr saddr; 122 struct in6_addr daddr; 123 }; 124 125 /* 126 * This structure contains configuration options per IPv6 link. 127 */ 128 struct ipv6_devconf { 129 __s32 forwarding; 130 __s32 hop_limit; 131 __s32 mtu6; 132 __s32 accept_ra; 133 __s32 accept_redirects; 134 __s32 autoconf; 135 __s32 dad_transmits; 136 __s32 rtr_solicits; 137 __s32 rtr_solicit_interval; 138 __s32 rtr_solicit_delay; 139 __s32 force_mld_version; 140 #ifdef CONFIG_IPV6_PRIVACY 141 __s32 use_tempaddr; 142 __s32 temp_valid_lft; 143 __s32 temp_prefered_lft; 144 __s32 regen_max_retry; 145 __s32 max_desync_factor; 146 #endif 147 __s32 max_addresses; 148 __s32 accept_ra_defrtr; 149 __s32 accept_ra_pinfo; 150 #ifdef CONFIG_IPV6_ROUTER_PREF 151 __s32 accept_ra_rtr_pref; 152 __s32 rtr_probe_interval; 153 #ifdef CONFIG_IPV6_ROUTE_INFO 154 __s32 accept_ra_rt_info_max_plen; 155 #endif 156 #endif 157 void *sysctl; 158 }; 159 160 /* index values for the variables in ipv6_devconf */ 161 enum { 162 DEVCONF_FORWARDING = 0, 163 DEVCONF_HOPLIMIT, 164 DEVCONF_MTU6, 165 DEVCONF_ACCEPT_RA, 166 DEVCONF_ACCEPT_REDIRECTS, 167 DEVCONF_AUTOCONF, 168 DEVCONF_DAD_TRANSMITS, 169 DEVCONF_RTR_SOLICITS, 170 DEVCONF_RTR_SOLICIT_INTERVAL, 171 DEVCONF_RTR_SOLICIT_DELAY, 172 DEVCONF_USE_TEMPADDR, 173 DEVCONF_TEMP_VALID_LFT, 174 DEVCONF_TEMP_PREFERED_LFT, 175 DEVCONF_REGEN_MAX_RETRY, 176 DEVCONF_MAX_DESYNC_FACTOR, 177 DEVCONF_MAX_ADDRESSES, 178 DEVCONF_FORCE_MLD_VERSION, 179 DEVCONF_ACCEPT_RA_DEFRTR, 180 DEVCONF_ACCEPT_RA_PINFO, 181 DEVCONF_ACCEPT_RA_RTR_PREF, 182 DEVCONF_RTR_PROBE_INTERVAL, 183 DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN, 184 DEVCONF_MAX 185 }; 186 187 #ifdef __KERNEL__ 188 #include <linux/icmpv6.h> 189 #include <linux/tcp.h> 190 #include <linux/udp.h> 191 192 #include <net/if_inet6.h> /* struct ipv6_mc_socklist */ 193 #include <net/inet_sock.h> 194 195 /* 196 This structure contains results of exthdrs parsing 197 as offsets from skb->nh. 198 */ 199 200 struct inet6_skb_parm { 201 int iif; 202 __u16 ra; 203 __u16 hop; 204 __u16 dst0; 205 __u16 srcrt; 206 __u16 dst1; 207 __u16 lastopt; 208 __u32 nhoff; 209 __u16 flags; 210 211 #define IP6SKB_XFRM_TRANSFORMED 1 212 }; 213 214 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb)) 215 216 static inline int inet6_iif(const struct sk_buff *skb) 217 { 218 return IP6CB(skb)->iif; 219 } 220 221 struct inet6_request_sock { 222 struct in6_addr loc_addr; 223 struct in6_addr rmt_addr; 224 struct sk_buff *pktopts; 225 int iif; 226 }; 227 228 struct tcp6_request_sock { 229 struct tcp_request_sock tcp6rsk_tcp; 230 struct inet6_request_sock tcp6rsk_inet6; 231 }; 232 233 /** 234 * struct ipv6_pinfo - ipv6 private area 235 * 236 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc) 237 * this _must_ be the last member, so that inet6_sk_generic 238 * is able to calculate its offset from the base struct sock 239 * by using the struct proto->slab_obj_size member. -acme 240 */ 241 struct ipv6_pinfo { 242 struct in6_addr saddr; 243 struct in6_addr rcv_saddr; 244 struct in6_addr daddr; 245 struct in6_addr *daddr_cache; 246 247 __u32 flow_label; 248 __u32 frag_size; 249 __s16 hop_limit; 250 __s16 mcast_hops; 251 int mcast_oif; 252 253 /* pktoption flags */ 254 union { 255 struct { 256 __u16 srcrt:2, 257 osrcrt:2, 258 rxinfo:1, 259 rxoinfo:1, 260 rxhlim:1, 261 rxohlim:1, 262 hopopts:1, 263 ohopopts:1, 264 dstopts:1, 265 odstopts:1, 266 rxflow:1, 267 rxtclass:1; 268 } bits; 269 __u16 all; 270 } rxopt; 271 272 /* sockopt flags */ 273 __u8 mc_loop:1, 274 recverr:1, 275 sndflow:1, 276 pmtudisc:2, 277 ipv6only:1; 278 __u8 tclass; 279 280 __u32 dst_cookie; 281 282 struct ipv6_mc_socklist *ipv6_mc_list; 283 struct ipv6_ac_socklist *ipv6_ac_list; 284 struct ipv6_fl_socklist *ipv6_fl_list; 285 286 struct ipv6_txoptions *opt; 287 struct sk_buff *pktoptions; 288 struct { 289 struct ipv6_txoptions *opt; 290 struct rt6_info *rt; 291 int hop_limit; 292 int tclass; 293 } cork; 294 }; 295 296 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */ 297 struct raw6_sock { 298 /* inet_sock has to be the first member of raw6_sock */ 299 struct inet_sock inet; 300 __u32 checksum; /* perform checksum */ 301 __u32 offset; /* checksum offset */ 302 struct icmp6_filter filter; 303 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */ 304 struct ipv6_pinfo inet6; 305 }; 306 307 struct udp6_sock { 308 struct udp_sock udp; 309 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */ 310 struct ipv6_pinfo inet6; 311 }; 312 313 struct tcp6_sock { 314 struct tcp_sock tcp; 315 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */ 316 struct ipv6_pinfo inet6; 317 }; 318 319 extern int inet6_sk_rebuild_header(struct sock *sk); 320 321 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 322 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 323 { 324 return inet_sk(__sk)->pinet6; 325 } 326 327 static inline struct inet6_request_sock * 328 inet6_rsk(const struct request_sock *rsk) 329 { 330 return (struct inet6_request_sock *)(((u8 *)rsk) + 331 inet_rsk(rsk)->inet6_rsk_offset); 332 } 333 334 static inline u32 inet6_rsk_offset(struct request_sock *rsk) 335 { 336 return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock); 337 } 338 339 static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops) 340 { 341 struct request_sock *req = reqsk_alloc(ops); 342 343 if (req != NULL) 344 inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req); 345 346 return req; 347 } 348 349 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 350 { 351 return (struct raw6_sock *)sk; 352 } 353 354 static inline void inet_sk_copy_descendant(struct sock *sk_to, 355 const struct sock *sk_from) 356 { 357 int ancestor_size = sizeof(struct inet_sock); 358 359 if (sk_from->sk_family == PF_INET6) 360 ancestor_size += sizeof(struct ipv6_pinfo); 361 362 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size); 363 } 364 365 #define __ipv6_only_sock(sk) (inet6_sk(sk)->ipv6only) 366 #define ipv6_only_sock(sk) ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk)) 367 368 struct inet6_timewait_sock { 369 struct in6_addr tw_v6_daddr; 370 struct in6_addr tw_v6_rcv_saddr; 371 }; 372 373 struct tcp6_timewait_sock { 374 struct tcp_timewait_sock tcp6tw_tcp; 375 struct inet6_timewait_sock tcp6tw_inet6; 376 }; 377 378 static inline u16 inet6_tw_offset(const struct proto *prot) 379 { 380 return prot->twsk_prot->twsk_obj_size - 381 sizeof(struct inet6_timewait_sock); 382 } 383 384 static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk) 385 { 386 return (struct inet6_timewait_sock *)(((u8 *)sk) + 387 inet_twsk(sk)->tw_ipv6_offset); 388 } 389 390 static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk) 391 { 392 return likely(sk->sk_state != TCP_TIME_WAIT) ? 393 &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr; 394 } 395 396 static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk) 397 { 398 return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL; 399 } 400 401 static inline int inet_v6_ipv6only(const struct sock *sk) 402 { 403 return likely(sk->sk_state != TCP_TIME_WAIT) ? 404 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only; 405 } 406 #else 407 #define __ipv6_only_sock(sk) 0 408 #define ipv6_only_sock(sk) 0 409 410 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 411 { 412 return NULL; 413 } 414 415 static inline struct inet6_request_sock * 416 inet6_rsk(const struct request_sock *rsk) 417 { 418 return NULL; 419 } 420 421 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 422 { 423 return NULL; 424 } 425 426 #define __inet6_rcv_saddr(__sk) NULL 427 #define inet6_rcv_saddr(__sk) NULL 428 #define tcp_twsk_ipv6only(__sk) 0 429 #define inet_v6_ipv6only(__sk) 0 430 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */ 431 432 #define INET6_MATCH(__sk, __hash, __saddr, __daddr, __ports, __dif)\ 433 (((__sk)->sk_hash == (__hash)) && \ 434 ((*((__u32 *)&(inet_sk(__sk)->dport))) == (__ports)) && \ 435 ((__sk)->sk_family == AF_INET6) && \ 436 ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr)) && \ 437 ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \ 438 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif)))) 439 440 #endif /* __KERNEL__ */ 441 442 #endif /* _IPV6_H */ 443