1 /* 2 * Linux INET6 implementation 3 * 4 * Authors: 5 * Pedro Roque <roque@di.fc.ul.pt> 6 * 7 * $Id: ipv6.h,v 1.1 2002/05/20 15:13:07 jgrimm Exp $ 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License 11 * as published by the Free Software Foundation; either version 12 * 2 of the License, or (at your option) any later version. 13 */ 14 15 #ifndef _NET_IPV6_H 16 #define _NET_IPV6_H 17 18 #include <linux/ipv6.h> 19 #include <linux/hardirq.h> 20 #include <net/if_inet6.h> 21 #include <net/ndisc.h> 22 #include <net/flow.h> 23 #include <net/snmp.h> 24 25 #define SIN6_LEN_RFC2133 24 26 27 #define IPV6_MAXPLEN 65535 28 29 /* 30 * NextHeader field of IPv6 header 31 */ 32 33 #define NEXTHDR_HOP 0 /* Hop-by-hop option header. */ 34 #define NEXTHDR_TCP 6 /* TCP segment. */ 35 #define NEXTHDR_UDP 17 /* UDP message. */ 36 #define NEXTHDR_IPV6 41 /* IPv6 in IPv6 */ 37 #define NEXTHDR_ROUTING 43 /* Routing header. */ 38 #define NEXTHDR_FRAGMENT 44 /* Fragmentation/reassembly header. */ 39 #define NEXTHDR_ESP 50 /* Encapsulating security payload. */ 40 #define NEXTHDR_AUTH 51 /* Authentication header. */ 41 #define NEXTHDR_ICMP 58 /* ICMP for IPv6. */ 42 #define NEXTHDR_NONE 59 /* No next header */ 43 #define NEXTHDR_DEST 60 /* Destination options header. */ 44 #define NEXTHDR_MOBILITY 135 /* Mobility header. */ 45 46 #define NEXTHDR_MAX 255 47 48 49 50 #define IPV6_DEFAULT_HOPLIMIT 64 51 #define IPV6_DEFAULT_MCASTHOPS 1 52 53 /* 54 * Addr type 55 * 56 * type - unicast | multicast 57 * scope - local | site | global 58 * v4 - compat 59 * v4mapped 60 * any 61 * loopback 62 */ 63 64 #define IPV6_ADDR_ANY 0x0000U 65 66 #define IPV6_ADDR_UNICAST 0x0001U 67 #define IPV6_ADDR_MULTICAST 0x0002U 68 69 #define IPV6_ADDR_LOOPBACK 0x0010U 70 #define IPV6_ADDR_LINKLOCAL 0x0020U 71 #define IPV6_ADDR_SITELOCAL 0x0040U 72 73 #define IPV6_ADDR_COMPATv4 0x0080U 74 75 #define IPV6_ADDR_SCOPE_MASK 0x00f0U 76 77 #define IPV6_ADDR_MAPPED 0x1000U 78 #define IPV6_ADDR_RESERVED 0x2000U /* reserved address space */ 79 80 /* 81 * Addr scopes 82 */ 83 #ifdef __KERNEL__ 84 #define IPV6_ADDR_MC_SCOPE(a) \ 85 ((a)->s6_addr[1] & 0x0f) /* nonstandard */ 86 #define __IPV6_ADDR_SCOPE_INVALID -1 87 #endif 88 #define IPV6_ADDR_SCOPE_NODELOCAL 0x01 89 #define IPV6_ADDR_SCOPE_LINKLOCAL 0x02 90 #define IPV6_ADDR_SCOPE_SITELOCAL 0x05 91 #define IPV6_ADDR_SCOPE_ORGLOCAL 0x08 92 #define IPV6_ADDR_SCOPE_GLOBAL 0x0e 93 94 /* 95 * fragmentation header 96 */ 97 98 struct frag_hdr { 99 __u8 nexthdr; 100 __u8 reserved; 101 __be16 frag_off; 102 __be32 identification; 103 }; 104 105 #define IP6_MF 0x0001 106 107 #ifdef __KERNEL__ 108 109 #include <net/sock.h> 110 111 /* sysctls */ 112 extern int sysctl_mld_max_msf; 113 extern struct ctl_path net_ipv6_ctl_path[]; 114 115 #define _DEVINC(statname, modifier, idev, field) \ 116 ({ \ 117 struct inet6_dev *_idev = (idev); \ 118 if (likely(_idev != NULL)) \ 119 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \ 120 SNMP_INC_STATS##modifier(statname##_statistics, (field)); \ 121 }) 122 123 #define _DEVADD(statname, modifier, idev, field, val) \ 124 ({ \ 125 struct inet6_dev *_idev = (idev); \ 126 if (likely(_idev != NULL)) \ 127 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \ 128 SNMP_ADD_STATS##modifier(statname##_statistics, (field), (val));\ 129 }) 130 131 /* MIBs */ 132 DECLARE_SNMP_STAT(struct ipstats_mib, ipv6_statistics); 133 134 #define IP6_INC_STATS(idev,field) _DEVINC(ipv6, , idev, field) 135 #define IP6_INC_STATS_BH(idev,field) _DEVINC(ipv6, _BH, idev, field) 136 #define IP6_INC_STATS_USER(idev,field) _DEVINC(ipv6, _USER, idev, field) 137 #define IP6_ADD_STATS_BH(idev,field,val) _DEVADD(ipv6, _BH, idev, field, val) 138 139 DECLARE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics); 140 DECLARE_SNMP_STAT(struct icmpv6msg_mib, icmpv6msg_statistics); 141 142 #define ICMP6_INC_STATS(idev, field) _DEVINC(icmpv6, , idev, field) 143 #define ICMP6_INC_STATS_BH(idev, field) _DEVINC(icmpv6, _BH, idev, field) 144 #define ICMP6_INC_STATS_USER(idev, field) _DEVINC(icmpv6, _USER, idev, field) 145 146 #define ICMP6MSGOUT_INC_STATS(idev, field) \ 147 _DEVINC(icmpv6msg, , idev, field +256) 148 #define ICMP6MSGOUT_INC_STATS_BH(idev, field) \ 149 _DEVINC(icmpv6msg, _BH, idev, field +256) 150 #define ICMP6MSGOUT_INC_STATS_USER(idev, field) \ 151 _DEVINC(icmpv6msg, _USER, idev, field +256) 152 #define ICMP6MSGIN_INC_STATS(idev, field) \ 153 _DEVINC(icmpv6msg, , idev, field) 154 #define ICMP6MSGIN_INC_STATS_BH(idev, field) \ 155 _DEVINC(icmpv6msg, _BH, idev, field) 156 #define ICMP6MSGIN_INC_STATS_USER(idev, field) \ 157 _DEVINC(icmpv6msg, _USER, idev, field) 158 159 struct ip6_ra_chain 160 { 161 struct ip6_ra_chain *next; 162 struct sock *sk; 163 int sel; 164 void (*destructor)(struct sock *); 165 }; 166 167 extern struct ip6_ra_chain *ip6_ra_chain; 168 extern rwlock_t ip6_ra_lock; 169 170 /* 171 This structure is prepared by protocol, when parsing 172 ancillary data and passed to IPv6. 173 */ 174 175 struct ipv6_txoptions 176 { 177 /* Length of this structure */ 178 int tot_len; 179 180 /* length of extension headers */ 181 182 __u16 opt_flen; /* after fragment hdr */ 183 __u16 opt_nflen; /* before fragment hdr */ 184 185 struct ipv6_opt_hdr *hopopt; 186 struct ipv6_opt_hdr *dst0opt; 187 struct ipv6_rt_hdr *srcrt; /* Routing Header */ 188 struct ipv6_opt_hdr *dst1opt; 189 190 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */ 191 }; 192 193 struct ip6_flowlabel 194 { 195 struct ip6_flowlabel *next; 196 __be32 label; 197 atomic_t users; 198 struct in6_addr dst; 199 struct ipv6_txoptions *opt; 200 unsigned long linger; 201 u8 share; 202 u32 owner; 203 unsigned long lastuse; 204 unsigned long expires; 205 struct net *fl_net; 206 }; 207 208 #define IPV6_FLOWINFO_MASK __constant_htonl(0x0FFFFFFF) 209 #define IPV6_FLOWLABEL_MASK __constant_htonl(0x000FFFFF) 210 211 struct ipv6_fl_socklist 212 { 213 struct ipv6_fl_socklist *next; 214 struct ip6_flowlabel *fl; 215 }; 216 217 extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label); 218 extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space, 219 struct ip6_flowlabel * fl, 220 struct ipv6_txoptions * fopt); 221 extern void fl6_free_socklist(struct sock *sk); 222 extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen); 223 extern int ip6_flowlabel_init(void); 224 extern void ip6_flowlabel_cleanup(void); 225 226 static inline void fl6_sock_release(struct ip6_flowlabel *fl) 227 { 228 if (fl) 229 atomic_dec(&fl->users); 230 } 231 232 extern int ip6_ra_control(struct sock *sk, int sel, 233 void (*destructor)(struct sock *)); 234 235 236 extern int ipv6_parse_hopopts(struct sk_buff *skb); 237 238 extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt); 239 extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt, 240 int newtype, 241 struct ipv6_opt_hdr __user *newopt, 242 int newoptlen); 243 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space, 244 struct ipv6_txoptions *opt); 245 246 extern int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb); 247 248 int ip6_frag_nqueues(struct net *net); 249 int ip6_frag_mem(struct net *net); 250 251 #define IPV6_FRAG_TIMEOUT (60*HZ) /* 60 seconds */ 252 253 extern int __ipv6_addr_type(const struct in6_addr *addr); 254 static inline int ipv6_addr_type(const struct in6_addr *addr) 255 { 256 return __ipv6_addr_type(addr) & 0xffff; 257 } 258 259 static inline int ipv6_addr_scope(const struct in6_addr *addr) 260 { 261 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK; 262 } 263 264 static inline int __ipv6_addr_src_scope(int type) 265 { 266 return (type == IPV6_ADDR_ANY ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16)); 267 } 268 269 static inline int ipv6_addr_src_scope(const struct in6_addr *addr) 270 { 271 return __ipv6_addr_src_scope(__ipv6_addr_type(addr)); 272 } 273 274 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2) 275 { 276 return memcmp(a1, a2, sizeof(struct in6_addr)); 277 } 278 279 static inline int 280 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m, 281 const struct in6_addr *a2) 282 { 283 return (!!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) | 284 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) | 285 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) | 286 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]))); 287 } 288 289 static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2) 290 { 291 memcpy(a1, a2, sizeof(struct in6_addr)); 292 } 293 294 static inline void ipv6_addr_prefix(struct in6_addr *pfx, 295 const struct in6_addr *addr, 296 int plen) 297 { 298 /* caller must guarantee 0 <= plen <= 128 */ 299 int o = plen >> 3, 300 b = plen & 0x7; 301 302 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr)); 303 memcpy(pfx->s6_addr, addr, o); 304 if (b != 0) 305 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b); 306 } 307 308 static inline void ipv6_addr_set(struct in6_addr *addr, 309 __be32 w1, __be32 w2, 310 __be32 w3, __be32 w4) 311 { 312 addr->s6_addr32[0] = w1; 313 addr->s6_addr32[1] = w2; 314 addr->s6_addr32[2] = w3; 315 addr->s6_addr32[3] = w4; 316 } 317 318 static inline int ipv6_addr_equal(const struct in6_addr *a1, 319 const struct in6_addr *a2) 320 { 321 return (((a1->s6_addr32[0] ^ a2->s6_addr32[0]) | 322 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) | 323 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) | 324 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0); 325 } 326 327 static inline int __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2, 328 unsigned int prefixlen) 329 { 330 unsigned pdw, pbi; 331 332 /* check complete u32 in prefix */ 333 pdw = prefixlen >> 5; 334 if (pdw && memcmp(a1, a2, pdw << 2)) 335 return 0; 336 337 /* check incomplete u32 in prefix */ 338 pbi = prefixlen & 0x1f; 339 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi)))) 340 return 0; 341 342 return 1; 343 } 344 345 static inline int ipv6_prefix_equal(const struct in6_addr *a1, 346 const struct in6_addr *a2, 347 unsigned int prefixlen) 348 { 349 return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32, 350 prefixlen); 351 } 352 353 struct inet_frag_queue; 354 355 struct ip6_create_arg { 356 __be32 id; 357 struct in6_addr *src; 358 struct in6_addr *dst; 359 }; 360 361 void ip6_frag_init(struct inet_frag_queue *q, void *a); 362 int ip6_frag_match(struct inet_frag_queue *q, void *a); 363 364 static inline int ipv6_addr_any(const struct in6_addr *a) 365 { 366 return ((a->s6_addr32[0] | a->s6_addr32[1] | 367 a->s6_addr32[2] | a->s6_addr32[3] ) == 0); 368 } 369 370 static inline int ipv6_addr_v4mapped(const struct in6_addr *a) 371 { 372 return ((a->s6_addr32[0] | a->s6_addr32[1] | 373 (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0); 374 } 375 376 /* 377 * Check for a RFC 4843 ORCHID address 378 * (Overlay Routable Cryptographic Hash Identifiers) 379 */ 380 static inline int ipv6_addr_orchid(const struct in6_addr *a) 381 { 382 return ((a->s6_addr32[0] & htonl(0xfffffff0)) 383 == htonl(0x20010010)); 384 } 385 386 static inline void ipv6_addr_set_v4mapped(const __be32 addr, 387 struct in6_addr *v4mapped) 388 { 389 ipv6_addr_set(v4mapped, 390 0, 0, 391 htonl(0x0000FFFF), 392 addr); 393 } 394 395 /* 396 * find the first different bit between two addresses 397 * length of address must be a multiple of 32bits 398 */ 399 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen) 400 { 401 const __be32 *a1 = token1, *a2 = token2; 402 int i; 403 404 addrlen >>= 2; 405 406 for (i = 0; i < addrlen; i++) { 407 __be32 xb = a1[i] ^ a2[i]; 408 if (xb) 409 return i * 32 + 32 - fls(ntohl(xb)); 410 } 411 412 /* 413 * we should *never* get to this point since that 414 * would mean the addrs are equal 415 * 416 * However, we do get to it 8) And exacly, when 417 * addresses are equal 8) 418 * 419 * ip route add 1111::/128 via ... 420 * ip route add 1111::/64 via ... 421 * and we are here. 422 * 423 * Ideally, this function should stop comparison 424 * at prefix length. It does not, but it is still OK, 425 * if returned value is greater than prefix length. 426 * --ANK (980803) 427 */ 428 return (addrlen << 5); 429 } 430 431 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2) 432 { 433 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr)); 434 } 435 436 /* 437 * Prototypes exported by ipv6 438 */ 439 440 /* 441 * rcv function (called from netdevice level) 442 */ 443 444 extern int ipv6_rcv(struct sk_buff *skb, 445 struct net_device *dev, 446 struct packet_type *pt, 447 struct net_device *orig_dev); 448 449 extern int ip6_rcv_finish(struct sk_buff *skb); 450 451 /* 452 * upper-layer output functions 453 */ 454 extern int ip6_xmit(struct sock *sk, 455 struct sk_buff *skb, 456 struct flowi *fl, 457 struct ipv6_txoptions *opt, 458 int ipfragok); 459 460 extern int ip6_nd_hdr(struct sock *sk, 461 struct sk_buff *skb, 462 struct net_device *dev, 463 const struct in6_addr *saddr, 464 const struct in6_addr *daddr, 465 int proto, int len); 466 467 extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr); 468 469 extern int ip6_append_data(struct sock *sk, 470 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb), 471 void *from, 472 int length, 473 int transhdrlen, 474 int hlimit, 475 int tclass, 476 struct ipv6_txoptions *opt, 477 struct flowi *fl, 478 struct rt6_info *rt, 479 unsigned int flags); 480 481 extern int ip6_push_pending_frames(struct sock *sk); 482 483 extern void ip6_flush_pending_frames(struct sock *sk); 484 485 extern int ip6_dst_lookup(struct sock *sk, 486 struct dst_entry **dst, 487 struct flowi *fl); 488 extern int ip6_dst_blackhole(struct sock *sk, 489 struct dst_entry **dst, 490 struct flowi *fl); 491 extern int ip6_sk_dst_lookup(struct sock *sk, 492 struct dst_entry **dst, 493 struct flowi *fl); 494 495 /* 496 * skb processing functions 497 */ 498 499 extern int ip6_output(struct sk_buff *skb); 500 extern int ip6_forward(struct sk_buff *skb); 501 extern int ip6_input(struct sk_buff *skb); 502 extern int ip6_mc_input(struct sk_buff *skb); 503 504 extern int __ip6_local_out(struct sk_buff *skb); 505 extern int ip6_local_out(struct sk_buff *skb); 506 507 /* 508 * Extension header (options) processing 509 */ 510 511 extern void ipv6_push_nfrag_opts(struct sk_buff *skb, 512 struct ipv6_txoptions *opt, 513 u8 *proto, 514 struct in6_addr **daddr_p); 515 extern void ipv6_push_frag_opts(struct sk_buff *skb, 516 struct ipv6_txoptions *opt, 517 u8 *proto); 518 519 extern int ipv6_skip_exthdr(const struct sk_buff *, int start, 520 u8 *nexthdrp); 521 522 extern int ipv6_ext_hdr(u8 nexthdr); 523 524 extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type); 525 526 /* 527 * socket options (ipv6_sockglue.c) 528 */ 529 530 extern int ipv6_setsockopt(struct sock *sk, int level, 531 int optname, 532 char __user *optval, 533 int optlen); 534 extern int ipv6_getsockopt(struct sock *sk, int level, 535 int optname, 536 char __user *optval, 537 int __user *optlen); 538 extern int compat_ipv6_setsockopt(struct sock *sk, 539 int level, 540 int optname, 541 char __user *optval, 542 int optlen); 543 extern int compat_ipv6_getsockopt(struct sock *sk, 544 int level, 545 int optname, 546 char __user *optval, 547 int __user *optlen); 548 549 extern int ip6_datagram_connect(struct sock *sk, 550 struct sockaddr *addr, int addr_len); 551 552 extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len); 553 extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, 554 u32 info, u8 *payload); 555 extern void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info); 556 557 extern int inet6_release(struct socket *sock); 558 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr, 559 int addr_len); 560 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 561 int *uaddr_len, int peer); 562 extern int inet6_ioctl(struct socket *sock, unsigned int cmd, 563 unsigned long arg); 564 565 extern int inet6_hash_connect(struct inet_timewait_death_row *death_row, 566 struct sock *sk); 567 568 /* 569 * reassembly.c 570 */ 571 extern const struct proto_ops inet6_stream_ops; 572 extern const struct proto_ops inet6_dgram_ops; 573 574 struct group_source_req; 575 struct group_filter; 576 577 extern int ip6_mc_source(int add, int omode, struct sock *sk, 578 struct group_source_req *pgsr); 579 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf); 580 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 581 struct group_filter __user *optval, 582 int __user *optlen); 583 584 #ifdef CONFIG_PROC_FS 585 extern int ac6_proc_init(struct net *net); 586 extern void ac6_proc_exit(struct net *net); 587 extern int raw6_proc_init(void); 588 extern void raw6_proc_exit(void); 589 extern int tcp6_proc_init(struct net *net); 590 extern void tcp6_proc_exit(struct net *net); 591 extern int udp6_proc_init(struct net *net); 592 extern void udp6_proc_exit(struct net *net); 593 extern int udplite6_proc_init(void); 594 extern void udplite6_proc_exit(void); 595 extern int ipv6_misc_proc_init(void); 596 extern void ipv6_misc_proc_exit(void); 597 extern int snmp6_register_dev(struct inet6_dev *idev); 598 extern int snmp6_unregister_dev(struct inet6_dev *idev); 599 600 #else 601 static inline int ac6_proc_init(struct net *net) { return 0; } 602 static inline void ac6_proc_exit(struct net *net) { } 603 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; } 604 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; } 605 #endif 606 607 #ifdef CONFIG_SYSCTL 608 extern ctl_table ipv6_route_table_template[]; 609 extern ctl_table ipv6_icmp_table_template[]; 610 611 extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net); 612 extern struct ctl_table *ipv6_route_sysctl_init(struct net *net); 613 extern int ipv6_sysctl_register(void); 614 extern void ipv6_sysctl_unregister(void); 615 #endif 616 617 #endif /* __KERNEL__ */ 618 #endif /* _NET_IPV6_H */ 619