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 33 /* 34 * routing header 35 */ 36 struct ipv6_rt_hdr { 37 __u8 nexthdr; 38 __u8 hdrlen; 39 __u8 type; 40 __u8 segments_left; 41 42 /* 43 * type specific data 44 * variable length field 45 */ 46 }; 47 48 49 struct ipv6_opt_hdr { 50 __u8 nexthdr; 51 __u8 hdrlen; 52 /* 53 * TLV encoded option data follows. 54 */ 55 }; 56 57 #define ipv6_destopt_hdr ipv6_opt_hdr 58 #define ipv6_hopopt_hdr ipv6_opt_hdr 59 60 #ifdef __KERNEL__ 61 #define ipv6_optlen(p) (((p)->hdrlen+1) << 3) 62 #endif 63 64 /* 65 * routing header type 0 (used in cmsghdr struct) 66 */ 67 68 struct rt0_hdr { 69 struct ipv6_rt_hdr rt_hdr; 70 __u32 reserved; 71 struct in6_addr addr[0]; 72 73 #define rt0_type rt_hdr.type 74 }; 75 76 struct ipv6_auth_hdr { 77 __u8 nexthdr; 78 __u8 hdrlen; /* This one is measured in 32 bit units! */ 79 __u16 reserved; 80 __u32 spi; 81 __u32 seq_no; /* Sequence number */ 82 __u8 auth_data[0]; /* Length variable but >=4. Mind the 64 bit alignment! */ 83 }; 84 85 struct ipv6_esp_hdr { 86 __u32 spi; 87 __u32 seq_no; /* Sequence number */ 88 __u8 enc_data[0]; /* Length variable but >=8. Mind the 64 bit alignment! */ 89 }; 90 91 struct ipv6_comp_hdr { 92 __u8 nexthdr; 93 __u8 flags; 94 __u16 cpi; 95 }; 96 97 /* 98 * IPv6 fixed header 99 * 100 * BEWARE, it is incorrect. The first 4 bits of flow_lbl 101 * are glued to priority now, forming "class". 102 */ 103 104 struct ipv6hdr { 105 #if defined(__LITTLE_ENDIAN_BITFIELD) 106 __u8 priority:4, 107 version:4; 108 #elif defined(__BIG_ENDIAN_BITFIELD) 109 __u8 version:4, 110 priority:4; 111 #else 112 #error "Please fix <asm/byteorder.h>" 113 #endif 114 __u8 flow_lbl[3]; 115 116 __u16 payload_len; 117 __u8 nexthdr; 118 __u8 hop_limit; 119 120 struct in6_addr saddr; 121 struct in6_addr daddr; 122 }; 123 124 /* 125 * This structure contains configuration options per IPv6 link. 126 */ 127 struct ipv6_devconf { 128 __s32 forwarding; 129 __s32 hop_limit; 130 __s32 mtu6; 131 __s32 accept_ra; 132 __s32 accept_redirects; 133 __s32 autoconf; 134 __s32 dad_transmits; 135 __s32 rtr_solicits; 136 __s32 rtr_solicit_interval; 137 __s32 rtr_solicit_delay; 138 __s32 force_mld_version; 139 #ifdef CONFIG_IPV6_PRIVACY 140 __s32 use_tempaddr; 141 __s32 temp_valid_lft; 142 __s32 temp_prefered_lft; 143 __s32 regen_max_retry; 144 __s32 max_desync_factor; 145 #endif 146 __s32 max_addresses; 147 __s32 accept_ra_defrtr; 148 __s32 accept_ra_pinfo; 149 #ifdef CONFIG_IPV6_ROUTER_PREF 150 __s32 accept_ra_rtr_pref; 151 __s32 rtr_probe_interval; 152 #ifdef CONFIG_IPV6_ROUTE_INFO 153 __s32 accept_ra_rt_info_max_plen; 154 #endif 155 #endif 156 void *sysctl; 157 }; 158 159 /* index values for the variables in ipv6_devconf */ 160 enum { 161 DEVCONF_FORWARDING = 0, 162 DEVCONF_HOPLIMIT, 163 DEVCONF_MTU6, 164 DEVCONF_ACCEPT_RA, 165 DEVCONF_ACCEPT_REDIRECTS, 166 DEVCONF_AUTOCONF, 167 DEVCONF_DAD_TRANSMITS, 168 DEVCONF_RTR_SOLICITS, 169 DEVCONF_RTR_SOLICIT_INTERVAL, 170 DEVCONF_RTR_SOLICIT_DELAY, 171 DEVCONF_USE_TEMPADDR, 172 DEVCONF_TEMP_VALID_LFT, 173 DEVCONF_TEMP_PREFERED_LFT, 174 DEVCONF_REGEN_MAX_RETRY, 175 DEVCONF_MAX_DESYNC_FACTOR, 176 DEVCONF_MAX_ADDRESSES, 177 DEVCONF_FORCE_MLD_VERSION, 178 DEVCONF_ACCEPT_RA_DEFRTR, 179 DEVCONF_ACCEPT_RA_PINFO, 180 DEVCONF_ACCEPT_RA_RTR_PREF, 181 DEVCONF_RTR_PROBE_INTERVAL, 182 DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN, 183 DEVCONF_MAX 184 }; 185 186 #ifdef __KERNEL__ 187 #include <linux/icmpv6.h> 188 #include <linux/tcp.h> 189 #include <linux/udp.h> 190 191 #include <net/if_inet6.h> /* struct ipv6_mc_socklist */ 192 #include <net/inet_sock.h> 193 194 /* 195 This structure contains results of exthdrs parsing 196 as offsets from skb->nh. 197 */ 198 199 struct inet6_skb_parm { 200 int iif; 201 __u16 ra; 202 __u16 hop; 203 __u16 dst0; 204 __u16 srcrt; 205 __u16 dst1; 206 __u16 lastopt; 207 __u32 nhoff; 208 __u16 flags; 209 210 #define IP6SKB_XFRM_TRANSFORMED 1 211 }; 212 213 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb)) 214 215 static inline int inet6_iif(const struct sk_buff *skb) 216 { 217 return IP6CB(skb)->iif; 218 } 219 220 struct inet6_request_sock { 221 struct in6_addr loc_addr; 222 struct in6_addr rmt_addr; 223 struct sk_buff *pktopts; 224 int iif; 225 }; 226 227 struct tcp6_request_sock { 228 struct tcp_request_sock tcp6rsk_tcp; 229 struct inet6_request_sock tcp6rsk_inet6; 230 }; 231 232 /** 233 * struct ipv6_pinfo - ipv6 private area 234 * 235 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc) 236 * this _must_ be the last member, so that inet6_sk_generic 237 * is able to calculate its offset from the base struct sock 238 * by using the struct proto->slab_obj_size member. -acme 239 */ 240 struct ipv6_pinfo { 241 struct in6_addr saddr; 242 struct in6_addr rcv_saddr; 243 struct in6_addr daddr; 244 struct in6_addr *daddr_cache; 245 246 __u32 flow_label; 247 __u32 frag_size; 248 __s16 hop_limit; 249 __s16 mcast_hops; 250 int mcast_oif; 251 252 /* pktoption flags */ 253 union { 254 struct { 255 __u16 srcrt:2, 256 osrcrt:2, 257 rxinfo:1, 258 rxoinfo:1, 259 rxhlim:1, 260 rxohlim:1, 261 hopopts:1, 262 ohopopts:1, 263 dstopts:1, 264 odstopts:1, 265 rxflow:1, 266 rxtclass:1; 267 } bits; 268 __u16 all; 269 } rxopt; 270 271 /* sockopt flags */ 272 __u8 mc_loop:1, 273 recverr:1, 274 sndflow:1, 275 pmtudisc:2, 276 ipv6only:1; 277 __u8 tclass; 278 279 __u32 dst_cookie; 280 281 struct ipv6_mc_socklist *ipv6_mc_list; 282 struct ipv6_ac_socklist *ipv6_ac_list; 283 struct ipv6_fl_socklist *ipv6_fl_list; 284 285 struct ipv6_txoptions *opt; 286 struct sk_buff *pktoptions; 287 struct { 288 struct ipv6_txoptions *opt; 289 struct rt6_info *rt; 290 int hop_limit; 291 int tclass; 292 } cork; 293 }; 294 295 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */ 296 struct raw6_sock { 297 /* inet_sock has to be the first member of raw6_sock */ 298 struct inet_sock inet; 299 __u32 checksum; /* perform checksum */ 300 __u32 offset; /* checksum offset */ 301 struct icmp6_filter filter; 302 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */ 303 struct ipv6_pinfo inet6; 304 }; 305 306 struct udp6_sock { 307 struct udp_sock udp; 308 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */ 309 struct ipv6_pinfo inet6; 310 }; 311 312 struct tcp6_sock { 313 struct tcp_sock tcp; 314 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */ 315 struct ipv6_pinfo inet6; 316 }; 317 318 extern int inet6_sk_rebuild_header(struct sock *sk); 319 320 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 321 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 322 { 323 return inet_sk(__sk)->pinet6; 324 } 325 326 static inline struct inet6_request_sock * 327 inet6_rsk(const struct request_sock *rsk) 328 { 329 return (struct inet6_request_sock *)(((u8 *)rsk) + 330 inet_rsk(rsk)->inet6_rsk_offset); 331 } 332 333 static inline u32 inet6_rsk_offset(struct request_sock *rsk) 334 { 335 return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock); 336 } 337 338 static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops) 339 { 340 struct request_sock *req = reqsk_alloc(ops); 341 342 if (req != NULL) 343 inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req); 344 345 return req; 346 } 347 348 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 349 { 350 return (struct raw6_sock *)sk; 351 } 352 353 static inline void inet_sk_copy_descendant(struct sock *sk_to, 354 const struct sock *sk_from) 355 { 356 int ancestor_size = sizeof(struct inet_sock); 357 358 if (sk_from->sk_family == PF_INET6) 359 ancestor_size += sizeof(struct ipv6_pinfo); 360 361 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size); 362 } 363 364 #define __ipv6_only_sock(sk) (inet6_sk(sk)->ipv6only) 365 #define ipv6_only_sock(sk) ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk)) 366 367 struct inet6_timewait_sock { 368 struct in6_addr tw_v6_daddr; 369 struct in6_addr tw_v6_rcv_saddr; 370 }; 371 372 struct tcp6_timewait_sock { 373 struct tcp_timewait_sock tcp6tw_tcp; 374 struct inet6_timewait_sock tcp6tw_inet6; 375 }; 376 377 static inline u16 inet6_tw_offset(const struct proto *prot) 378 { 379 return prot->twsk_prot->twsk_obj_size - 380 sizeof(struct inet6_timewait_sock); 381 } 382 383 static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk) 384 { 385 return (struct inet6_timewait_sock *)(((u8 *)sk) + 386 inet_twsk(sk)->tw_ipv6_offset); 387 } 388 389 static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk) 390 { 391 return likely(sk->sk_state != TCP_TIME_WAIT) ? 392 &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr; 393 } 394 395 static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk) 396 { 397 return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL; 398 } 399 400 static inline int inet_v6_ipv6only(const struct sock *sk) 401 { 402 return likely(sk->sk_state != TCP_TIME_WAIT) ? 403 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only; 404 } 405 #else 406 #define __ipv6_only_sock(sk) 0 407 #define ipv6_only_sock(sk) 0 408 409 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 410 { 411 return NULL; 412 } 413 414 static inline struct inet6_request_sock * 415 inet6_rsk(const struct request_sock *rsk) 416 { 417 return NULL; 418 } 419 420 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 421 { 422 return NULL; 423 } 424 425 #define __inet6_rcv_saddr(__sk) NULL 426 #define inet6_rcv_saddr(__sk) NULL 427 #define tcp_twsk_ipv6only(__sk) 0 428 #define inet_v6_ipv6only(__sk) 0 429 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */ 430 431 #define INET6_MATCH(__sk, __hash, __saddr, __daddr, __ports, __dif)\ 432 (((__sk)->sk_hash == (__hash)) && \ 433 ((*((__u32 *)&(inet_sk(__sk)->dport))) == (__ports)) && \ 434 ((__sk)->sk_family == AF_INET6) && \ 435 ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr)) && \ 436 ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \ 437 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif)))) 438 439 #endif /* __KERNEL__ */ 440 441 #endif /* _IPV6_H */ 442