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_ipv6_bindv6only; 113 extern int sysctl_mld_max_msf; 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 ICMP6_INC_STATS_OFFSET_BH(idev, field, offset) ({ \ 147 struct inet6_dev *_idev = idev; \ 148 __typeof__(offset) _offset = (offset); \ 149 if (likely(_idev != NULL)) \ 150 SNMP_INC_STATS_OFFSET_BH(_idev->stats.icmpv6, field, _offset); \ 151 SNMP_INC_STATS_OFFSET_BH(icmpv6_statistics, field, _offset); \ 152 }) 153 154 #define ICMP6MSGOUT_INC_STATS(idev, field) \ 155 _DEVINC(icmpv6msg, , idev, field +256) 156 #define ICMP6MSGOUT_INC_STATS_BH(idev, field) \ 157 _DEVINC(icmpv6msg, _BH, idev, field +256) 158 #define ICMP6MSGOUT_INC_STATS_USER(idev, field) \ 159 _DEVINC(icmpv6msg, _USER, idev, field +256) 160 #define ICMP6MSGIN_INC_STATS(idev, field) \ 161 _DEVINC(icmpv6msg, , idev, field) 162 #define ICMP6MSGIN_INC_STATS_BH(idev, field) \ 163 _DEVINC(icmpv6msg, _BH, idev, field) 164 #define ICMP6MSGIN_INC_STATS_USER(idev, field) \ 165 _DEVINC(icmpv6msg, _USER, idev, field) 166 167 DECLARE_SNMP_STAT(struct udp_mib, udp_stats_in6); 168 DECLARE_SNMP_STAT(struct udp_mib, udplite_stats_in6); 169 #define UDP6_INC_STATS_BH(field, is_udplite) do { \ 170 if (is_udplite) SNMP_INC_STATS_BH(udplite_stats_in6, field); \ 171 else SNMP_INC_STATS_BH(udp_stats_in6, field); } while(0) 172 #define UDP6_INC_STATS_USER(field, is_udplite) do { \ 173 if (is_udplite) SNMP_INC_STATS_USER(udplite_stats_in6, field); \ 174 else SNMP_INC_STATS_USER(udp_stats_in6, field); } while(0) 175 176 struct ip6_ra_chain 177 { 178 struct ip6_ra_chain *next; 179 struct sock *sk; 180 int sel; 181 void (*destructor)(struct sock *); 182 }; 183 184 extern struct ip6_ra_chain *ip6_ra_chain; 185 extern rwlock_t ip6_ra_lock; 186 187 /* 188 This structure is prepared by protocol, when parsing 189 ancillary data and passed to IPv6. 190 */ 191 192 struct ipv6_txoptions 193 { 194 /* Length of this structure */ 195 int tot_len; 196 197 /* length of extension headers */ 198 199 __u16 opt_flen; /* after fragment hdr */ 200 __u16 opt_nflen; /* before fragment hdr */ 201 202 struct ipv6_opt_hdr *hopopt; 203 struct ipv6_opt_hdr *dst0opt; 204 struct ipv6_rt_hdr *srcrt; /* Routing Header */ 205 struct ipv6_opt_hdr *dst1opt; 206 207 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */ 208 }; 209 210 struct ip6_flowlabel 211 { 212 struct ip6_flowlabel *next; 213 __be32 label; 214 atomic_t users; 215 struct in6_addr dst; 216 struct ipv6_txoptions *opt; 217 unsigned long linger; 218 u8 share; 219 u32 owner; 220 unsigned long lastuse; 221 unsigned long expires; 222 }; 223 224 #define IPV6_FLOWINFO_MASK __constant_htonl(0x0FFFFFFF) 225 #define IPV6_FLOWLABEL_MASK __constant_htonl(0x000FFFFF) 226 227 struct ipv6_fl_socklist 228 { 229 struct ipv6_fl_socklist *next; 230 struct ip6_flowlabel *fl; 231 }; 232 233 extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label); 234 extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space, 235 struct ip6_flowlabel * fl, 236 struct ipv6_txoptions * fopt); 237 extern void fl6_free_socklist(struct sock *sk); 238 extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen); 239 extern void ip6_flowlabel_init(void); 240 extern void ip6_flowlabel_cleanup(void); 241 242 static inline void fl6_sock_release(struct ip6_flowlabel *fl) 243 { 244 if (fl) 245 atomic_dec(&fl->users); 246 } 247 248 extern int ip6_ra_control(struct sock *sk, int sel, 249 void (*destructor)(struct sock *)); 250 251 252 extern int ipv6_parse_hopopts(struct sk_buff *skb); 253 254 extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt); 255 extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt, 256 int newtype, 257 struct ipv6_opt_hdr __user *newopt, 258 int newoptlen); 259 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space, 260 struct ipv6_txoptions *opt); 261 262 extern int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb); 263 264 int ip6_frag_nqueues(void); 265 int ip6_frag_mem(void); 266 267 #define IPV6_FRAG_TIMEOUT (60*HZ) /* 60 seconds */ 268 269 /* 270 * Function prototype for build_xmit 271 */ 272 273 typedef int (*inet_getfrag_t) (const void *data, 274 struct in6_addr *addr, 275 char *, 276 unsigned int, unsigned int); 277 278 extern int __ipv6_addr_type(const struct in6_addr *addr); 279 static inline int ipv6_addr_type(const struct in6_addr *addr) 280 { 281 return __ipv6_addr_type(addr) & 0xffff; 282 } 283 284 static inline int ipv6_addr_scope(const struct in6_addr *addr) 285 { 286 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK; 287 } 288 289 static inline int __ipv6_addr_src_scope(int type) 290 { 291 return (type == IPV6_ADDR_ANY ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16)); 292 } 293 294 static inline int ipv6_addr_src_scope(const struct in6_addr *addr) 295 { 296 return __ipv6_addr_src_scope(__ipv6_addr_type(addr)); 297 } 298 299 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2) 300 { 301 return memcmp(a1, a2, sizeof(struct in6_addr)); 302 } 303 304 static inline int 305 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m, 306 const struct in6_addr *a2) 307 { 308 unsigned int i; 309 310 for (i = 0; i < 4; i++) 311 if ((a1->s6_addr32[i] ^ a2->s6_addr32[i]) & m->s6_addr32[i]) 312 return 1; 313 return 0; 314 } 315 316 static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2) 317 { 318 memcpy(a1, a2, sizeof(struct in6_addr)); 319 } 320 321 static inline void ipv6_addr_prefix(struct in6_addr *pfx, 322 const struct in6_addr *addr, 323 int plen) 324 { 325 /* caller must guarantee 0 <= plen <= 128 */ 326 int o = plen >> 3, 327 b = plen & 0x7; 328 329 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr)); 330 memcpy(pfx->s6_addr, addr, o); 331 if (b != 0) 332 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b); 333 } 334 335 static inline void ipv6_addr_set(struct in6_addr *addr, 336 __be32 w1, __be32 w2, 337 __be32 w3, __be32 w4) 338 { 339 addr->s6_addr32[0] = w1; 340 addr->s6_addr32[1] = w2; 341 addr->s6_addr32[2] = w3; 342 addr->s6_addr32[3] = w4; 343 } 344 345 static inline int ipv6_addr_equal(const struct in6_addr *a1, 346 const struct in6_addr *a2) 347 { 348 return (a1->s6_addr32[0] == a2->s6_addr32[0] && 349 a1->s6_addr32[1] == a2->s6_addr32[1] && 350 a1->s6_addr32[2] == a2->s6_addr32[2] && 351 a1->s6_addr32[3] == a2->s6_addr32[3]); 352 } 353 354 static inline int __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2, 355 unsigned int prefixlen) 356 { 357 unsigned pdw, pbi; 358 359 /* check complete u32 in prefix */ 360 pdw = prefixlen >> 5; 361 if (pdw && memcmp(a1, a2, pdw << 2)) 362 return 0; 363 364 /* check incomplete u32 in prefix */ 365 pbi = prefixlen & 0x1f; 366 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi)))) 367 return 0; 368 369 return 1; 370 } 371 372 static inline int ipv6_prefix_equal(const struct in6_addr *a1, 373 const struct in6_addr *a2, 374 unsigned int prefixlen) 375 { 376 return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32, 377 prefixlen); 378 } 379 380 struct inet_frag_queue; 381 382 struct ip6_create_arg { 383 __be32 id; 384 struct in6_addr *src; 385 struct in6_addr *dst; 386 }; 387 388 void ip6_frag_init(struct inet_frag_queue *q, void *a); 389 int ip6_frag_match(struct inet_frag_queue *q, void *a); 390 391 static inline int ipv6_addr_any(const struct in6_addr *a) 392 { 393 return ((a->s6_addr32[0] | a->s6_addr32[1] | 394 a->s6_addr32[2] | a->s6_addr32[3] ) == 0); 395 } 396 397 static inline int ipv6_addr_v4mapped(const struct in6_addr *a) 398 { 399 return ((a->s6_addr32[0] | a->s6_addr32[1]) == 0 && 400 a->s6_addr32[2] == htonl(0x0000ffff)); 401 } 402 403 /* 404 * find the first different bit between two addresses 405 * length of address must be a multiple of 32bits 406 */ 407 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen) 408 { 409 const __be32 *a1 = token1, *a2 = token2; 410 int i; 411 412 addrlen >>= 2; 413 414 for (i = 0; i < addrlen; i++) { 415 __be32 xb = a1[i] ^ a2[i]; 416 if (xb) 417 return i * 32 + 32 - fls(ntohl(xb)); 418 } 419 420 /* 421 * we should *never* get to this point since that 422 * would mean the addrs are equal 423 * 424 * However, we do get to it 8) And exacly, when 425 * addresses are equal 8) 426 * 427 * ip route add 1111::/128 via ... 428 * ip route add 1111::/64 via ... 429 * and we are here. 430 * 431 * Ideally, this function should stop comparison 432 * at prefix length. It does not, but it is still OK, 433 * if returned value is greater than prefix length. 434 * --ANK (980803) 435 */ 436 return (addrlen << 5); 437 } 438 439 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2) 440 { 441 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr)); 442 } 443 444 /* 445 * Prototypes exported by ipv6 446 */ 447 448 /* 449 * rcv function (called from netdevice level) 450 */ 451 452 extern int ipv6_rcv(struct sk_buff *skb, 453 struct net_device *dev, 454 struct packet_type *pt, 455 struct net_device *orig_dev); 456 457 extern int ip6_rcv_finish(struct sk_buff *skb); 458 459 /* 460 * upper-layer output functions 461 */ 462 extern int ip6_xmit(struct sock *sk, 463 struct sk_buff *skb, 464 struct flowi *fl, 465 struct ipv6_txoptions *opt, 466 int ipfragok); 467 468 extern int ip6_nd_hdr(struct sock *sk, 469 struct sk_buff *skb, 470 struct net_device *dev, 471 struct in6_addr *saddr, 472 struct in6_addr *daddr, 473 int proto, int len); 474 475 extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr); 476 477 extern int ip6_append_data(struct sock *sk, 478 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb), 479 void *from, 480 int length, 481 int transhdrlen, 482 int hlimit, 483 int tclass, 484 struct ipv6_txoptions *opt, 485 struct flowi *fl, 486 struct rt6_info *rt, 487 unsigned int flags); 488 489 extern int ip6_push_pending_frames(struct sock *sk); 490 491 extern void ip6_flush_pending_frames(struct sock *sk); 492 493 extern int ip6_dst_lookup(struct sock *sk, 494 struct dst_entry **dst, 495 struct flowi *fl); 496 extern int ip6_dst_blackhole(struct sock *sk, 497 struct dst_entry **dst, 498 struct flowi *fl); 499 extern int ip6_sk_dst_lookup(struct sock *sk, 500 struct dst_entry **dst, 501 struct flowi *fl); 502 503 /* 504 * skb processing functions 505 */ 506 507 extern int ip6_output(struct sk_buff *skb); 508 extern int ip6_forward(struct sk_buff *skb); 509 extern int ip6_input(struct sk_buff *skb); 510 extern int ip6_mc_input(struct sk_buff *skb); 511 512 /* 513 * Extension header (options) processing 514 */ 515 516 extern u8 * ipv6_build_nfrag_opts(struct sk_buff *skb, 517 u8 *prev_hdr, 518 struct ipv6_txoptions *opt, 519 struct in6_addr *daddr, 520 u32 jumbolen); 521 extern u8 * ipv6_build_frag_opts(struct sk_buff *skb, 522 u8 *prev_hdr, 523 struct ipv6_txoptions *opt); 524 extern void ipv6_push_nfrag_opts(struct sk_buff *skb, 525 struct ipv6_txoptions *opt, 526 u8 *proto, 527 struct in6_addr **daddr_p); 528 extern void ipv6_push_frag_opts(struct sk_buff *skb, 529 struct ipv6_txoptions *opt, 530 u8 *proto); 531 532 extern int ipv6_skip_exthdr(const struct sk_buff *, int start, 533 u8 *nexthdrp); 534 535 extern int ipv6_ext_hdr(u8 nexthdr); 536 537 extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type); 538 539 /* 540 * socket options (ipv6_sockglue.c) 541 */ 542 543 extern int ipv6_setsockopt(struct sock *sk, int level, 544 int optname, 545 char __user *optval, 546 int optlen); 547 extern int ipv6_getsockopt(struct sock *sk, int level, 548 int optname, 549 char __user *optval, 550 int __user *optlen); 551 extern int compat_ipv6_setsockopt(struct sock *sk, 552 int level, 553 int optname, 554 char __user *optval, 555 int optlen); 556 extern int compat_ipv6_getsockopt(struct sock *sk, 557 int level, 558 int optname, 559 char __user *optval, 560 int __user *optlen); 561 562 extern void ipv6_packet_init(void); 563 564 extern void ipv6_packet_cleanup(void); 565 566 extern int ip6_datagram_connect(struct sock *sk, 567 struct sockaddr *addr, int addr_len); 568 569 extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len); 570 extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, 571 u32 info, u8 *payload); 572 extern void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info); 573 574 extern int inet6_release(struct socket *sock); 575 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr, 576 int addr_len); 577 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 578 int *uaddr_len, int peer); 579 extern int inet6_ioctl(struct socket *sock, unsigned int cmd, 580 unsigned long arg); 581 582 extern int inet6_hash_connect(struct inet_timewait_death_row *death_row, 583 struct sock *sk); 584 585 /* 586 * reassembly.c 587 */ 588 struct inet_frags_ctl; 589 extern struct inet_frags_ctl ip6_frags_ctl; 590 591 extern const struct proto_ops inet6_stream_ops; 592 extern const struct proto_ops inet6_dgram_ops; 593 594 struct group_source_req; 595 struct group_filter; 596 597 extern int ip6_mc_source(int add, int omode, struct sock *sk, 598 struct group_source_req *pgsr); 599 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf); 600 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 601 struct group_filter __user *optval, 602 int __user *optlen); 603 604 #ifdef CONFIG_PROC_FS 605 extern int ac6_proc_init(void); 606 extern void ac6_proc_exit(void); 607 extern int raw6_proc_init(void); 608 extern void raw6_proc_exit(void); 609 extern int tcp6_proc_init(void); 610 extern void tcp6_proc_exit(void); 611 extern int udp6_proc_init(void); 612 extern void udp6_proc_exit(void); 613 extern int udplite6_proc_init(void); 614 extern void udplite6_proc_exit(void); 615 extern int ipv6_misc_proc_init(void); 616 extern void ipv6_misc_proc_exit(void); 617 extern int snmp6_register_dev(struct inet6_dev *idev); 618 extern int snmp6_unregister_dev(struct inet6_dev *idev); 619 620 extern struct rt6_statistics rt6_stats; 621 #else 622 static inline int snmp6_register_dev(struct inet6_dev *idev) 623 { 624 return 0; 625 } 626 627 static inline int snmp6_unregister_dev(struct inet6_dev *idev) 628 { 629 return 0; 630 } 631 #endif 632 633 #ifdef CONFIG_SYSCTL 634 extern ctl_table ipv6_route_table[]; 635 extern ctl_table ipv6_icmp_table[]; 636 637 extern void ipv6_sysctl_register(void); 638 extern void ipv6_sysctl_unregister(void); 639 #endif 640 641 #endif /* __KERNEL__ */ 642 #endif /* _NET_IPV6_H */ 643