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 void *sysctl; 149 }; 150 151 /* index values for the variables in ipv6_devconf */ 152 enum { 153 DEVCONF_FORWARDING = 0, 154 DEVCONF_HOPLIMIT, 155 DEVCONF_MTU6, 156 DEVCONF_ACCEPT_RA, 157 DEVCONF_ACCEPT_REDIRECTS, 158 DEVCONF_AUTOCONF, 159 DEVCONF_DAD_TRANSMITS, 160 DEVCONF_RTR_SOLICITS, 161 DEVCONF_RTR_SOLICIT_INTERVAL, 162 DEVCONF_RTR_SOLICIT_DELAY, 163 DEVCONF_USE_TEMPADDR, 164 DEVCONF_TEMP_VALID_LFT, 165 DEVCONF_TEMP_PREFERED_LFT, 166 DEVCONF_REGEN_MAX_RETRY, 167 DEVCONF_MAX_DESYNC_FACTOR, 168 DEVCONF_MAX_ADDRESSES, 169 DEVCONF_FORCE_MLD_VERSION, 170 DEVCONF_MAX 171 }; 172 173 #ifdef __KERNEL__ 174 #include <linux/icmpv6.h> 175 #include <linux/tcp.h> 176 #include <linux/udp.h> 177 178 #include <net/if_inet6.h> /* struct ipv6_mc_socklist */ 179 #include <net/inet_sock.h> 180 181 /* 182 This structure contains results of exthdrs parsing 183 as offsets from skb->nh. 184 */ 185 186 struct inet6_skb_parm { 187 int iif; 188 __u16 ra; 189 __u16 hop; 190 __u16 dst0; 191 __u16 srcrt; 192 __u16 dst1; 193 __u16 lastopt; 194 __u32 nhoff; 195 __u16 flags; 196 197 #define IP6SKB_XFRM_TRANSFORMED 1 198 }; 199 200 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb)) 201 202 static inline int inet6_iif(const struct sk_buff *skb) 203 { 204 return IP6CB(skb)->iif; 205 } 206 207 struct inet6_request_sock { 208 struct in6_addr loc_addr; 209 struct in6_addr rmt_addr; 210 struct sk_buff *pktopts; 211 int iif; 212 }; 213 214 struct tcp6_request_sock { 215 struct tcp_request_sock tcp6rsk_tcp; 216 struct inet6_request_sock tcp6rsk_inet6; 217 }; 218 219 /** 220 * struct ipv6_pinfo - ipv6 private area 221 * 222 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc) 223 * this _must_ be the last member, so that inet6_sk_generic 224 * is able to calculate its offset from the base struct sock 225 * by using the struct proto->slab_obj_size member. -acme 226 */ 227 struct ipv6_pinfo { 228 struct in6_addr saddr; 229 struct in6_addr rcv_saddr; 230 struct in6_addr daddr; 231 struct in6_addr *daddr_cache; 232 233 __u32 flow_label; 234 __u32 frag_size; 235 __s16 hop_limit; 236 __s16 mcast_hops; 237 int mcast_oif; 238 239 /* pktoption flags */ 240 union { 241 struct { 242 __u16 srcrt:2, 243 osrcrt:2, 244 rxinfo:1, 245 rxoinfo:1, 246 rxhlim:1, 247 rxohlim:1, 248 hopopts:1, 249 ohopopts:1, 250 dstopts:1, 251 odstopts:1, 252 rxflow:1, 253 rxtclass:1; 254 } bits; 255 __u16 all; 256 } rxopt; 257 258 /* sockopt flags */ 259 __u8 mc_loop:1, 260 recverr:1, 261 sndflow:1, 262 pmtudisc:2, 263 ipv6only:1; 264 __u8 tclass; 265 266 __u32 dst_cookie; 267 268 struct ipv6_mc_socklist *ipv6_mc_list; 269 struct ipv6_ac_socklist *ipv6_ac_list; 270 struct ipv6_fl_socklist *ipv6_fl_list; 271 272 struct ipv6_txoptions *opt; 273 struct sk_buff *pktoptions; 274 struct { 275 struct ipv6_txoptions *opt; 276 struct rt6_info *rt; 277 int hop_limit; 278 int tclass; 279 } cork; 280 }; 281 282 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */ 283 struct raw6_sock { 284 /* inet_sock has to be the first member of raw6_sock */ 285 struct inet_sock inet; 286 __u32 checksum; /* perform checksum */ 287 __u32 offset; /* checksum offset */ 288 struct icmp6_filter filter; 289 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */ 290 struct ipv6_pinfo inet6; 291 }; 292 293 struct udp6_sock { 294 struct udp_sock udp; 295 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */ 296 struct ipv6_pinfo inet6; 297 }; 298 299 struct tcp6_sock { 300 struct tcp_sock tcp; 301 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */ 302 struct ipv6_pinfo inet6; 303 }; 304 305 extern int inet6_sk_rebuild_header(struct sock *sk); 306 307 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 308 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 309 { 310 return inet_sk(__sk)->pinet6; 311 } 312 313 static inline struct inet6_request_sock * 314 inet6_rsk(const struct request_sock *rsk) 315 { 316 return (struct inet6_request_sock *)(((u8 *)rsk) + 317 inet_rsk(rsk)->inet6_rsk_offset); 318 } 319 320 static inline u32 inet6_rsk_offset(struct request_sock *rsk) 321 { 322 return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock); 323 } 324 325 static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops) 326 { 327 struct request_sock *req = reqsk_alloc(ops); 328 329 if (req != NULL) 330 inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req); 331 332 return req; 333 } 334 335 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 336 { 337 return (struct raw6_sock *)sk; 338 } 339 340 static inline void inet_sk_copy_descendant(struct sock *sk_to, 341 const struct sock *sk_from) 342 { 343 int ancestor_size = sizeof(struct inet_sock); 344 345 if (sk_from->sk_family == PF_INET6) 346 ancestor_size += sizeof(struct ipv6_pinfo); 347 348 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size); 349 } 350 351 #define __ipv6_only_sock(sk) (inet6_sk(sk)->ipv6only) 352 #define ipv6_only_sock(sk) ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk)) 353 354 struct inet6_timewait_sock { 355 struct in6_addr tw_v6_daddr; 356 struct in6_addr tw_v6_rcv_saddr; 357 }; 358 359 struct tcp6_timewait_sock { 360 struct tcp_timewait_sock tcp6tw_tcp; 361 struct inet6_timewait_sock tcp6tw_inet6; 362 }; 363 364 static inline u16 inet6_tw_offset(const struct proto *prot) 365 { 366 return prot->twsk_prot->twsk_obj_size - 367 sizeof(struct inet6_timewait_sock); 368 } 369 370 static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk) 371 { 372 return (struct inet6_timewait_sock *)(((u8 *)sk) + 373 inet_twsk(sk)->tw_ipv6_offset); 374 } 375 376 static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk) 377 { 378 return likely(sk->sk_state != TCP_TIME_WAIT) ? 379 &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr; 380 } 381 382 static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk) 383 { 384 return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL; 385 } 386 387 static inline int inet_v6_ipv6only(const struct sock *sk) 388 { 389 return likely(sk->sk_state != TCP_TIME_WAIT) ? 390 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only; 391 } 392 #else 393 #define __ipv6_only_sock(sk) 0 394 #define ipv6_only_sock(sk) 0 395 396 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 397 { 398 return NULL; 399 } 400 401 static inline struct inet6_request_sock * 402 inet6_rsk(const struct request_sock *rsk) 403 { 404 return NULL; 405 } 406 407 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 408 { 409 return NULL; 410 } 411 412 #define __inet6_rcv_saddr(__sk) NULL 413 #define inet6_rcv_saddr(__sk) NULL 414 #define tcp_twsk_ipv6only(__sk) 0 415 #define inet_v6_ipv6only(__sk) 0 416 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */ 417 418 #define INET6_MATCH(__sk, __hash, __saddr, __daddr, __ports, __dif)\ 419 (((__sk)->sk_hash == (__hash)) && \ 420 ((*((__u32 *)&(inet_sk(__sk)->dport))) == (__ports)) && \ 421 ((__sk)->sk_family == AF_INET6) && \ 422 ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr)) && \ 423 ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \ 424 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif)))) 425 426 #endif /* __KERNEL__ */ 427 428 #endif /* _IPV6_H */ 429