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/ndisc.h> 21 #include <net/flow.h> 22 #include <net/snmp.h> 23 24 #define SIN6_LEN_RFC2133 24 25 26 #define IPV6_MAXPLEN 65535 27 28 /* 29 * NextHeader field of IPv6 header 30 */ 31 32 #define NEXTHDR_HOP 0 /* Hop-by-hop option header. */ 33 #define NEXTHDR_TCP 6 /* TCP segment. */ 34 #define NEXTHDR_UDP 17 /* UDP message. */ 35 #define NEXTHDR_IPV6 41 /* IPv6 in IPv6 */ 36 #define NEXTHDR_ROUTING 43 /* Routing header. */ 37 #define NEXTHDR_FRAGMENT 44 /* Fragmentation/reassembly header. */ 38 #define NEXTHDR_ESP 50 /* Encapsulating security payload. */ 39 #define NEXTHDR_AUTH 51 /* Authentication header. */ 40 #define NEXTHDR_ICMP 58 /* ICMP for IPv6. */ 41 #define NEXTHDR_NONE 59 /* No next header */ 42 #define NEXTHDR_DEST 60 /* Destination options header. */ 43 #define NEXTHDR_MOBILITY 135 /* Mobility header. */ 44 45 #define NEXTHDR_MAX 255 46 47 48 49 #define IPV6_DEFAULT_HOPLIMIT 64 50 #define IPV6_DEFAULT_MCASTHOPS 1 51 52 /* 53 * Addr type 54 * 55 * type - unicast | multicast 56 * scope - local | site | global 57 * v4 - compat 58 * v4mapped 59 * any 60 * loopback 61 */ 62 63 #define IPV6_ADDR_ANY 0x0000U 64 65 #define IPV6_ADDR_UNICAST 0x0001U 66 #define IPV6_ADDR_MULTICAST 0x0002U 67 68 #define IPV6_ADDR_LOOPBACK 0x0010U 69 #define IPV6_ADDR_LINKLOCAL 0x0020U 70 #define IPV6_ADDR_SITELOCAL 0x0040U 71 72 #define IPV6_ADDR_COMPATv4 0x0080U 73 74 #define IPV6_ADDR_SCOPE_MASK 0x00f0U 75 76 #define IPV6_ADDR_MAPPED 0x1000U 77 #define IPV6_ADDR_RESERVED 0x2000U /* reserved address space */ 78 79 /* 80 * Addr scopes 81 */ 82 #ifdef __KERNEL__ 83 #define IPV6_ADDR_MC_SCOPE(a) \ 84 ((a)->s6_addr[1] & 0x0f) /* nonstandard */ 85 #define __IPV6_ADDR_SCOPE_INVALID -1 86 #endif 87 #define IPV6_ADDR_SCOPE_NODELOCAL 0x01 88 #define IPV6_ADDR_SCOPE_LINKLOCAL 0x02 89 #define IPV6_ADDR_SCOPE_SITELOCAL 0x05 90 #define IPV6_ADDR_SCOPE_ORGLOCAL 0x08 91 #define IPV6_ADDR_SCOPE_GLOBAL 0x0e 92 93 /* 94 * fragmentation header 95 */ 96 97 struct frag_hdr { 98 __u8 nexthdr; 99 __u8 reserved; 100 __be16 frag_off; 101 __be32 identification; 102 }; 103 104 #define IP6_MF 0x0001 105 106 #ifdef __KERNEL__ 107 108 #include <net/sock.h> 109 110 /* sysctls */ 111 extern int sysctl_ipv6_bindv6only; 112 extern int sysctl_mld_max_msf; 113 114 /* MIBs */ 115 DECLARE_SNMP_STAT(struct ipstats_mib, ipv6_statistics); 116 #define IP6_INC_STATS(idev,field) ({ \ 117 struct inet6_dev *_idev = (idev); \ 118 if (likely(_idev != NULL)) \ 119 SNMP_INC_STATS(_idev->stats.ipv6, field); \ 120 SNMP_INC_STATS(ipv6_statistics, field); \ 121 }) 122 #define IP6_INC_STATS_BH(idev,field) ({ \ 123 struct inet6_dev *_idev = (idev); \ 124 if (likely(_idev != NULL)) \ 125 SNMP_INC_STATS_BH(_idev->stats.ipv6, field); \ 126 SNMP_INC_STATS_BH(ipv6_statistics, field); \ 127 }) 128 #define IP6_INC_STATS_USER(idev,field) ({ \ 129 struct inet6_dev *_idev = (idev); \ 130 if (likely(_idev != NULL)) \ 131 SNMP_INC_STATS_USER(_idev->stats.ipv6, field); \ 132 SNMP_INC_STATS_USER(ipv6_statistics, field); \ 133 }) 134 DECLARE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics); 135 #define ICMP6_INC_STATS(idev, field) ({ \ 136 struct inet6_dev *_idev = (idev); \ 137 if (likely(_idev != NULL)) \ 138 SNMP_INC_STATS(idev->stats.icmpv6, field); \ 139 SNMP_INC_STATS(icmpv6_statistics, field); \ 140 }) 141 #define ICMP6_INC_STATS_BH(idev, field) ({ \ 142 struct inet6_dev *_idev = (idev); \ 143 if (likely(_idev != NULL)) \ 144 SNMP_INC_STATS_BH((_idev)->stats.icmpv6, field); \ 145 SNMP_INC_STATS_BH(icmpv6_statistics, field); \ 146 }) 147 #define ICMP6_INC_STATS_USER(idev, field) ({ \ 148 struct inet6_dev *_idev = (idev); \ 149 if (likely(_idev != NULL)) \ 150 SNMP_INC_STATS_USER(_idev->stats.icmpv6, field); \ 151 SNMP_INC_STATS_USER(icmpv6_statistics, field); \ 152 }) 153 #define ICMP6_INC_STATS_OFFSET_BH(idev, field, offset) ({ \ 154 struct inet6_dev *_idev = idev; \ 155 __typeof__(offset) _offset = (offset); \ 156 if (likely(_idev != NULL)) \ 157 SNMP_INC_STATS_OFFSET_BH(_idev->stats.icmpv6, field, _offset); \ 158 SNMP_INC_STATS_OFFSET_BH(icmpv6_statistics, field, _offset); \ 159 }) 160 DECLARE_SNMP_STAT(struct udp_mib, udp_stats_in6); 161 DECLARE_SNMP_STAT(struct udp_mib, udplite_stats_in6); 162 #define UDP6_INC_STATS_BH(field, is_udplite) do { \ 163 if (is_udplite) SNMP_INC_STATS_BH(udplite_stats_in6, field); \ 164 else SNMP_INC_STATS_BH(udp_stats_in6, field); } while(0) 165 #define UDP6_INC_STATS_USER(field, is_udplite) do { \ 166 if (is_udplite) SNMP_INC_STATS_USER(udplite_stats_in6, field); \ 167 else SNMP_INC_STATS_USER(udp_stats_in6, field); } while(0) 168 169 int snmp6_register_dev(struct inet6_dev *idev); 170 int snmp6_unregister_dev(struct inet6_dev *idev); 171 int snmp6_alloc_dev(struct inet6_dev *idev); 172 int snmp6_free_dev(struct inet6_dev *idev); 173 int snmp6_mib_init(void *ptr[2], size_t mibsize, size_t mibalign); 174 void snmp6_mib_free(void *ptr[2]); 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 struct in6_addr dst; 215 struct ipv6_txoptions *opt; 216 atomic_t users; 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 **skbp); 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 extern int ip6_frag_nqueues; 265 extern atomic_t ip6_frag_mem; 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((const void *) a1, (const void *) 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((void *) a1, (const void *) 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 memcpy(pfx->s6_addr, addr, o); 330 if (b != 0) { 331 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b); 332 o++; 333 } 334 if (o < 16) 335 memset(pfx->s6_addr + o, 0, 16 - o); 336 } 337 338 #ifndef __HAVE_ARCH_ADDR_SET 339 static inline void ipv6_addr_set(struct in6_addr *addr, 340 __be32 w1, __be32 w2, 341 __be32 w3, __be32 w4) 342 { 343 addr->s6_addr32[0] = w1; 344 addr->s6_addr32[1] = w2; 345 addr->s6_addr32[2] = w3; 346 addr->s6_addr32[3] = w4; 347 } 348 #endif 349 350 static inline int ipv6_addr_equal(const struct in6_addr *a1, 351 const struct in6_addr *a2) 352 { 353 return (a1->s6_addr32[0] == a2->s6_addr32[0] && 354 a1->s6_addr32[1] == a2->s6_addr32[1] && 355 a1->s6_addr32[2] == a2->s6_addr32[2] && 356 a1->s6_addr32[3] == a2->s6_addr32[3]); 357 } 358 359 static inline int __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2, 360 unsigned int prefixlen) 361 { 362 unsigned pdw, pbi; 363 364 /* check complete u32 in prefix */ 365 pdw = prefixlen >> 5; 366 if (pdw && memcmp(a1, a2, pdw << 2)) 367 return 0; 368 369 /* check incomplete u32 in prefix */ 370 pbi = prefixlen & 0x1f; 371 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi)))) 372 return 0; 373 374 return 1; 375 } 376 377 static inline int ipv6_prefix_equal(const struct in6_addr *a1, 378 const struct in6_addr *a2, 379 unsigned int prefixlen) 380 { 381 return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32, 382 prefixlen); 383 } 384 385 static inline int ipv6_addr_any(const struct in6_addr *a) 386 { 387 return ((a->s6_addr32[0] | a->s6_addr32[1] | 388 a->s6_addr32[2] | a->s6_addr32[3] ) == 0); 389 } 390 391 /* 392 * find the first different bit between two addresses 393 * length of address must be a multiple of 32bits 394 */ 395 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen) 396 { 397 const __be32 *a1 = token1, *a2 = token2; 398 int i; 399 400 addrlen >>= 2; 401 402 for (i = 0; i < addrlen; i++) { 403 __be32 xb = a1[i] ^ a2[i]; 404 if (xb) 405 return i * 32 + 32 - fls(ntohl(xb)); 406 } 407 408 /* 409 * we should *never* get to this point since that 410 * would mean the addrs are equal 411 * 412 * However, we do get to it 8) And exacly, when 413 * addresses are equal 8) 414 * 415 * ip route add 1111::/128 via ... 416 * ip route add 1111::/64 via ... 417 * and we are here. 418 * 419 * Ideally, this function should stop comparison 420 * at prefix length. It does not, but it is still OK, 421 * if returned value is greater than prefix length. 422 * --ANK (980803) 423 */ 424 return (addrlen << 5); 425 } 426 427 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2) 428 { 429 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr)); 430 } 431 432 /* 433 * Prototypes exported by ipv6 434 */ 435 436 /* 437 * rcv function (called from netdevice level) 438 */ 439 440 extern int ipv6_rcv(struct sk_buff *skb, 441 struct net_device *dev, 442 struct packet_type *pt, 443 struct net_device *orig_dev); 444 445 extern int ip6_rcv_finish(struct sk_buff *skb); 446 447 /* 448 * upper-layer output functions 449 */ 450 extern int ip6_xmit(struct sock *sk, 451 struct sk_buff *skb, 452 struct flowi *fl, 453 struct ipv6_txoptions *opt, 454 int ipfragok); 455 456 extern int ip6_nd_hdr(struct sock *sk, 457 struct sk_buff *skb, 458 struct net_device *dev, 459 struct in6_addr *saddr, 460 struct in6_addr *daddr, 461 int proto, int len); 462 463 extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr); 464 465 extern int ip6_append_data(struct sock *sk, 466 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb), 467 void *from, 468 int length, 469 int transhdrlen, 470 int hlimit, 471 int tclass, 472 struct ipv6_txoptions *opt, 473 struct flowi *fl, 474 struct rt6_info *rt, 475 unsigned int flags); 476 477 extern int ip6_push_pending_frames(struct sock *sk); 478 479 extern void ip6_flush_pending_frames(struct sock *sk); 480 481 extern int ip6_dst_lookup(struct sock *sk, 482 struct dst_entry **dst, 483 struct flowi *fl); 484 extern int ip6_sk_dst_lookup(struct sock *sk, 485 struct dst_entry **dst, 486 struct flowi *fl); 487 488 /* 489 * skb processing functions 490 */ 491 492 extern int ip6_output(struct sk_buff *skb); 493 extern int ip6_forward(struct sk_buff *skb); 494 extern int ip6_input(struct sk_buff *skb); 495 extern int ip6_mc_input(struct sk_buff *skb); 496 497 /* 498 * Extension header (options) processing 499 */ 500 501 extern u8 * ipv6_build_nfrag_opts(struct sk_buff *skb, 502 u8 *prev_hdr, 503 struct ipv6_txoptions *opt, 504 struct in6_addr *daddr, 505 u32 jumbolen); 506 extern u8 * ipv6_build_frag_opts(struct sk_buff *skb, 507 u8 *prev_hdr, 508 struct ipv6_txoptions *opt); 509 extern void ipv6_push_nfrag_opts(struct sk_buff *skb, 510 struct ipv6_txoptions *opt, 511 u8 *proto, 512 struct in6_addr **daddr_p); 513 extern void ipv6_push_frag_opts(struct sk_buff *skb, 514 struct ipv6_txoptions *opt, 515 u8 *proto); 516 517 extern int ipv6_skip_exthdr(const struct sk_buff *, int start, 518 u8 *nexthdrp); 519 520 extern int ipv6_ext_hdr(u8 nexthdr); 521 522 extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type); 523 524 extern struct ipv6_txoptions * ipv6_invert_rthdr(struct sock *sk, 525 struct ipv6_rt_hdr *hdr); 526 527 528 /* 529 * socket options (ipv6_sockglue.c) 530 */ 531 532 extern int ipv6_setsockopt(struct sock *sk, int level, 533 int optname, 534 char __user *optval, 535 int optlen); 536 extern int ipv6_getsockopt(struct sock *sk, int level, 537 int optname, 538 char __user *optval, 539 int __user *optlen); 540 extern int compat_ipv6_setsockopt(struct sock *sk, 541 int level, 542 int optname, 543 char __user *optval, 544 int optlen); 545 extern int compat_ipv6_getsockopt(struct sock *sk, 546 int level, 547 int optname, 548 char __user *optval, 549 int __user *optlen); 550 551 extern void ipv6_packet_init(void); 552 553 extern void ipv6_packet_cleanup(void); 554 555 extern int ip6_datagram_connect(struct sock *sk, 556 struct sockaddr *addr, int addr_len); 557 558 extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len); 559 extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, 560 u32 info, u8 *payload); 561 extern void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info); 562 563 extern int inet6_release(struct socket *sock); 564 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr, 565 int addr_len); 566 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 567 int *uaddr_len, int peer); 568 extern int inet6_ioctl(struct socket *sock, unsigned int cmd, 569 unsigned long arg); 570 571 extern int inet6_hash_connect(struct inet_timewait_death_row *death_row, 572 struct sock *sk); 573 574 /* 575 * reassembly.c 576 */ 577 extern int sysctl_ip6frag_high_thresh; 578 extern int sysctl_ip6frag_low_thresh; 579 extern int sysctl_ip6frag_time; 580 extern int sysctl_ip6frag_secret_interval; 581 582 extern const struct proto_ops inet6_stream_ops; 583 extern const struct proto_ops inet6_dgram_ops; 584 585 struct group_source_req; 586 struct group_filter; 587 588 extern int ip6_mc_source(int add, int omode, struct sock *sk, 589 struct group_source_req *pgsr); 590 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf); 591 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 592 struct group_filter __user *optval, 593 int __user *optlen); 594 595 #ifdef CONFIG_PROC_FS 596 extern int ac6_proc_init(void); 597 extern void ac6_proc_exit(void); 598 extern int raw6_proc_init(void); 599 extern void raw6_proc_exit(void); 600 extern int tcp6_proc_init(void); 601 extern void tcp6_proc_exit(void); 602 extern int udp6_proc_init(void); 603 extern void udp6_proc_exit(void); 604 extern int udplite6_proc_init(void); 605 extern void udplite6_proc_exit(void); 606 extern int ipv6_misc_proc_init(void); 607 extern void ipv6_misc_proc_exit(void); 608 609 extern struct rt6_statistics rt6_stats; 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