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 /* MIBs */ 116 DECLARE_SNMP_STAT(struct ipstats_mib, ipv6_statistics); 117 #define IP6_INC_STATS(idev,field) ({ \ 118 struct inet6_dev *_idev = (idev); \ 119 if (likely(_idev != NULL)) \ 120 SNMP_INC_STATS(_idev->stats.ipv6, field); \ 121 SNMP_INC_STATS(ipv6_statistics, field); \ 122 }) 123 #define IP6_INC_STATS_BH(idev,field) ({ \ 124 struct inet6_dev *_idev = (idev); \ 125 if (likely(_idev != NULL)) \ 126 SNMP_INC_STATS_BH(_idev->stats.ipv6, field); \ 127 SNMP_INC_STATS_BH(ipv6_statistics, field); \ 128 }) 129 #define IP6_INC_STATS_USER(idev,field) ({ \ 130 struct inet6_dev *_idev = (idev); \ 131 if (likely(_idev != NULL)) \ 132 SNMP_INC_STATS_USER(_idev->stats.ipv6, field); \ 133 SNMP_INC_STATS_USER(ipv6_statistics, field); \ 134 }) 135 DECLARE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics); 136 #define ICMP6_INC_STATS(idev, field) ({ \ 137 struct inet6_dev *_idev = (idev); \ 138 if (likely(_idev != NULL)) \ 139 SNMP_INC_STATS(idev->stats.icmpv6, field); \ 140 SNMP_INC_STATS(icmpv6_statistics, field); \ 141 }) 142 #define ICMP6_INC_STATS_BH(idev, field) ({ \ 143 struct inet6_dev *_idev = (idev); \ 144 if (likely(_idev != NULL)) \ 145 SNMP_INC_STATS_BH((_idev)->stats.icmpv6, field); \ 146 SNMP_INC_STATS_BH(icmpv6_statistics, field); \ 147 }) 148 #define ICMP6_INC_STATS_USER(idev, field) ({ \ 149 struct inet6_dev *_idev = (idev); \ 150 if (likely(_idev != NULL)) \ 151 SNMP_INC_STATS_USER(_idev->stats.icmpv6, field); \ 152 SNMP_INC_STATS_USER(icmpv6_statistics, field); \ 153 }) 154 #define ICMP6_INC_STATS_OFFSET_BH(idev, field, offset) ({ \ 155 struct inet6_dev *_idev = idev; \ 156 __typeof__(offset) _offset = (offset); \ 157 if (likely(_idev != NULL)) \ 158 SNMP_INC_STATS_OFFSET_BH(_idev->stats.icmpv6, field, _offset); \ 159 SNMP_INC_STATS_OFFSET_BH(icmpv6_statistics, field, _offset); \ 160 }) 161 DECLARE_SNMP_STAT(struct udp_mib, udp_stats_in6); 162 DECLARE_SNMP_STAT(struct udp_mib, udplite_stats_in6); 163 #define UDP6_INC_STATS_BH(field, is_udplite) do { \ 164 if (is_udplite) SNMP_INC_STATS_BH(udplite_stats_in6, field); \ 165 else SNMP_INC_STATS_BH(udp_stats_in6, field); } while(0) 166 #define UDP6_INC_STATS_USER(field, is_udplite) do { \ 167 if (is_udplite) SNMP_INC_STATS_USER(udplite_stats_in6, field); \ 168 else SNMP_INC_STATS_USER(udp_stats_in6, field); } while(0) 169 170 struct ip6_ra_chain 171 { 172 struct ip6_ra_chain *next; 173 struct sock *sk; 174 int sel; 175 void (*destructor)(struct sock *); 176 }; 177 178 extern struct ip6_ra_chain *ip6_ra_chain; 179 extern rwlock_t ip6_ra_lock; 180 181 /* 182 This structure is prepared by protocol, when parsing 183 ancillary data and passed to IPv6. 184 */ 185 186 struct ipv6_txoptions 187 { 188 /* Length of this structure */ 189 int tot_len; 190 191 /* length of extension headers */ 192 193 __u16 opt_flen; /* after fragment hdr */ 194 __u16 opt_nflen; /* before fragment hdr */ 195 196 struct ipv6_opt_hdr *hopopt; 197 struct ipv6_opt_hdr *dst0opt; 198 struct ipv6_rt_hdr *srcrt; /* Routing Header */ 199 struct ipv6_opt_hdr *dst1opt; 200 201 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */ 202 }; 203 204 struct ip6_flowlabel 205 { 206 struct ip6_flowlabel *next; 207 __be32 label; 208 atomic_t users; 209 struct in6_addr dst; 210 struct ipv6_txoptions *opt; 211 unsigned long linger; 212 u8 share; 213 u32 owner; 214 unsigned long lastuse; 215 unsigned long expires; 216 }; 217 218 #define IPV6_FLOWINFO_MASK __constant_htonl(0x0FFFFFFF) 219 #define IPV6_FLOWLABEL_MASK __constant_htonl(0x000FFFFF) 220 221 struct ipv6_fl_socklist 222 { 223 struct ipv6_fl_socklist *next; 224 struct ip6_flowlabel *fl; 225 }; 226 227 extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label); 228 extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space, 229 struct ip6_flowlabel * fl, 230 struct ipv6_txoptions * fopt); 231 extern void fl6_free_socklist(struct sock *sk); 232 extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen); 233 extern void ip6_flowlabel_init(void); 234 extern void ip6_flowlabel_cleanup(void); 235 236 static inline void fl6_sock_release(struct ip6_flowlabel *fl) 237 { 238 if (fl) 239 atomic_dec(&fl->users); 240 } 241 242 extern int ip6_ra_control(struct sock *sk, int sel, 243 void (*destructor)(struct sock *)); 244 245 246 extern int ipv6_parse_hopopts(struct sk_buff **skbp); 247 248 extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt); 249 extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt, 250 int newtype, 251 struct ipv6_opt_hdr __user *newopt, 252 int newoptlen); 253 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space, 254 struct ipv6_txoptions *opt); 255 256 extern int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb); 257 258 extern int ip6_frag_nqueues; 259 extern atomic_t ip6_frag_mem; 260 261 #define IPV6_FRAG_TIMEOUT (60*HZ) /* 60 seconds */ 262 263 /* 264 * Function prototype for build_xmit 265 */ 266 267 typedef int (*inet_getfrag_t) (const void *data, 268 struct in6_addr *addr, 269 char *, 270 unsigned int, unsigned int); 271 272 extern int __ipv6_addr_type(const struct in6_addr *addr); 273 static inline int ipv6_addr_type(const struct in6_addr *addr) 274 { 275 return __ipv6_addr_type(addr) & 0xffff; 276 } 277 278 static inline int ipv6_addr_scope(const struct in6_addr *addr) 279 { 280 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK; 281 } 282 283 static inline int __ipv6_addr_src_scope(int type) 284 { 285 return (type == IPV6_ADDR_ANY ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16)); 286 } 287 288 static inline int ipv6_addr_src_scope(const struct in6_addr *addr) 289 { 290 return __ipv6_addr_src_scope(__ipv6_addr_type(addr)); 291 } 292 293 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2) 294 { 295 return memcmp(a1, a2, sizeof(struct in6_addr)); 296 } 297 298 static inline int 299 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m, 300 const struct in6_addr *a2) 301 { 302 unsigned int i; 303 304 for (i = 0; i < 4; i++) 305 if ((a1->s6_addr32[i] ^ a2->s6_addr32[i]) & m->s6_addr32[i]) 306 return 1; 307 return 0; 308 } 309 310 static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2) 311 { 312 memcpy(a1, a2, sizeof(struct in6_addr)); 313 } 314 315 static inline void ipv6_addr_prefix(struct in6_addr *pfx, 316 const struct in6_addr *addr, 317 int plen) 318 { 319 /* caller must guarantee 0 <= plen <= 128 */ 320 int o = plen >> 3, 321 b = plen & 0x7; 322 323 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr)); 324 memcpy(pfx->s6_addr, addr, o); 325 if (b != 0) 326 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b); 327 } 328 329 static inline void ipv6_addr_set(struct in6_addr *addr, 330 __be32 w1, __be32 w2, 331 __be32 w3, __be32 w4) 332 { 333 addr->s6_addr32[0] = w1; 334 addr->s6_addr32[1] = w2; 335 addr->s6_addr32[2] = w3; 336 addr->s6_addr32[3] = w4; 337 } 338 339 static inline int ipv6_addr_equal(const struct in6_addr *a1, 340 const struct in6_addr *a2) 341 { 342 return (a1->s6_addr32[0] == a2->s6_addr32[0] && 343 a1->s6_addr32[1] == a2->s6_addr32[1] && 344 a1->s6_addr32[2] == a2->s6_addr32[2] && 345 a1->s6_addr32[3] == a2->s6_addr32[3]); 346 } 347 348 static inline int __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2, 349 unsigned int prefixlen) 350 { 351 unsigned pdw, pbi; 352 353 /* check complete u32 in prefix */ 354 pdw = prefixlen >> 5; 355 if (pdw && memcmp(a1, a2, pdw << 2)) 356 return 0; 357 358 /* check incomplete u32 in prefix */ 359 pbi = prefixlen & 0x1f; 360 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi)))) 361 return 0; 362 363 return 1; 364 } 365 366 static inline int ipv6_prefix_equal(const struct in6_addr *a1, 367 const struct in6_addr *a2, 368 unsigned int prefixlen) 369 { 370 return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32, 371 prefixlen); 372 } 373 374 static inline int ipv6_addr_any(const struct in6_addr *a) 375 { 376 return ((a->s6_addr32[0] | a->s6_addr32[1] | 377 a->s6_addr32[2] | a->s6_addr32[3] ) == 0); 378 } 379 380 /* 381 * find the first different bit between two addresses 382 * length of address must be a multiple of 32bits 383 */ 384 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen) 385 { 386 const __be32 *a1 = token1, *a2 = token2; 387 int i; 388 389 addrlen >>= 2; 390 391 for (i = 0; i < addrlen; i++) { 392 __be32 xb = a1[i] ^ a2[i]; 393 if (xb) 394 return i * 32 + 32 - fls(ntohl(xb)); 395 } 396 397 /* 398 * we should *never* get to this point since that 399 * would mean the addrs are equal 400 * 401 * However, we do get to it 8) And exacly, when 402 * addresses are equal 8) 403 * 404 * ip route add 1111::/128 via ... 405 * ip route add 1111::/64 via ... 406 * and we are here. 407 * 408 * Ideally, this function should stop comparison 409 * at prefix length. It does not, but it is still OK, 410 * if returned value is greater than prefix length. 411 * --ANK (980803) 412 */ 413 return (addrlen << 5); 414 } 415 416 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2) 417 { 418 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr)); 419 } 420 421 /* 422 * Prototypes exported by ipv6 423 */ 424 425 /* 426 * rcv function (called from netdevice level) 427 */ 428 429 extern int ipv6_rcv(struct sk_buff *skb, 430 struct net_device *dev, 431 struct packet_type *pt, 432 struct net_device *orig_dev); 433 434 extern int ip6_rcv_finish(struct sk_buff *skb); 435 436 /* 437 * upper-layer output functions 438 */ 439 extern int ip6_xmit(struct sock *sk, 440 struct sk_buff *skb, 441 struct flowi *fl, 442 struct ipv6_txoptions *opt, 443 int ipfragok); 444 445 extern int ip6_nd_hdr(struct sock *sk, 446 struct sk_buff *skb, 447 struct net_device *dev, 448 struct in6_addr *saddr, 449 struct in6_addr *daddr, 450 int proto, int len); 451 452 extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr); 453 454 extern int ip6_append_data(struct sock *sk, 455 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb), 456 void *from, 457 int length, 458 int transhdrlen, 459 int hlimit, 460 int tclass, 461 struct ipv6_txoptions *opt, 462 struct flowi *fl, 463 struct rt6_info *rt, 464 unsigned int flags); 465 466 extern int ip6_push_pending_frames(struct sock *sk); 467 468 extern void ip6_flush_pending_frames(struct sock *sk); 469 470 extern int ip6_dst_lookup(struct sock *sk, 471 struct dst_entry **dst, 472 struct flowi *fl); 473 extern int ip6_dst_blackhole(struct sock *sk, 474 struct dst_entry **dst, 475 struct flowi *fl); 476 extern int ip6_sk_dst_lookup(struct sock *sk, 477 struct dst_entry **dst, 478 struct flowi *fl); 479 480 /* 481 * skb processing functions 482 */ 483 484 extern int ip6_output(struct sk_buff *skb); 485 extern int ip6_forward(struct sk_buff *skb); 486 extern int ip6_input(struct sk_buff *skb); 487 extern int ip6_mc_input(struct sk_buff *skb); 488 489 /* 490 * Extension header (options) processing 491 */ 492 493 extern u8 * ipv6_build_nfrag_opts(struct sk_buff *skb, 494 u8 *prev_hdr, 495 struct ipv6_txoptions *opt, 496 struct in6_addr *daddr, 497 u32 jumbolen); 498 extern u8 * ipv6_build_frag_opts(struct sk_buff *skb, 499 u8 *prev_hdr, 500 struct ipv6_txoptions *opt); 501 extern void ipv6_push_nfrag_opts(struct sk_buff *skb, 502 struct ipv6_txoptions *opt, 503 u8 *proto, 504 struct in6_addr **daddr_p); 505 extern void ipv6_push_frag_opts(struct sk_buff *skb, 506 struct ipv6_txoptions *opt, 507 u8 *proto); 508 509 extern int ipv6_skip_exthdr(const struct sk_buff *, int start, 510 u8 *nexthdrp); 511 512 extern int ipv6_ext_hdr(u8 nexthdr); 513 514 extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type); 515 516 /* 517 * socket options (ipv6_sockglue.c) 518 */ 519 520 extern int ipv6_setsockopt(struct sock *sk, int level, 521 int optname, 522 char __user *optval, 523 int optlen); 524 extern int ipv6_getsockopt(struct sock *sk, int level, 525 int optname, 526 char __user *optval, 527 int __user *optlen); 528 extern int compat_ipv6_setsockopt(struct sock *sk, 529 int level, 530 int optname, 531 char __user *optval, 532 int optlen); 533 extern int compat_ipv6_getsockopt(struct sock *sk, 534 int level, 535 int optname, 536 char __user *optval, 537 int __user *optlen); 538 539 extern void ipv6_packet_init(void); 540 541 extern void ipv6_packet_cleanup(void); 542 543 extern int ip6_datagram_connect(struct sock *sk, 544 struct sockaddr *addr, int addr_len); 545 546 extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len); 547 extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, 548 u32 info, u8 *payload); 549 extern void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info); 550 551 extern int inet6_release(struct socket *sock); 552 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr, 553 int addr_len); 554 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 555 int *uaddr_len, int peer); 556 extern int inet6_ioctl(struct socket *sock, unsigned int cmd, 557 unsigned long arg); 558 559 extern int inet6_hash_connect(struct inet_timewait_death_row *death_row, 560 struct sock *sk); 561 562 /* 563 * reassembly.c 564 */ 565 extern int sysctl_ip6frag_high_thresh; 566 extern int sysctl_ip6frag_low_thresh; 567 extern int sysctl_ip6frag_time; 568 extern int sysctl_ip6frag_secret_interval; 569 570 extern const struct proto_ops inet6_stream_ops; 571 extern const struct proto_ops inet6_dgram_ops; 572 573 struct group_source_req; 574 struct group_filter; 575 576 extern int ip6_mc_source(int add, int omode, struct sock *sk, 577 struct group_source_req *pgsr); 578 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf); 579 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 580 struct group_filter __user *optval, 581 int __user *optlen); 582 583 #ifdef CONFIG_PROC_FS 584 extern int ac6_proc_init(void); 585 extern void ac6_proc_exit(void); 586 extern int raw6_proc_init(void); 587 extern void raw6_proc_exit(void); 588 extern int tcp6_proc_init(void); 589 extern void tcp6_proc_exit(void); 590 extern int udp6_proc_init(void); 591 extern void udp6_proc_exit(void); 592 extern int udplite6_proc_init(void); 593 extern void udplite6_proc_exit(void); 594 extern int ipv6_misc_proc_init(void); 595 extern void ipv6_misc_proc_exit(void); 596 extern int snmp6_register_dev(struct inet6_dev *idev); 597 extern int snmp6_unregister_dev(struct inet6_dev *idev); 598 599 extern struct rt6_statistics rt6_stats; 600 #else 601 static inline int snmp6_register_dev(struct inet6_dev *idev) 602 { 603 return 0; 604 } 605 606 static inline int snmp6_unregister_dev(struct inet6_dev *idev) 607 { 608 return 0; 609 } 610 #endif 611 612 #ifdef CONFIG_SYSCTL 613 extern ctl_table ipv6_route_table[]; 614 extern ctl_table ipv6_icmp_table[]; 615 616 extern void ipv6_sysctl_register(void); 617 extern void ipv6_sysctl_unregister(void); 618 #endif 619 620 #endif /* __KERNEL__ */ 621 #endif /* _NET_IPV6_H */ 622