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 struct ip6_ra_chain 170 { 171 struct ip6_ra_chain *next; 172 struct sock *sk; 173 int sel; 174 void (*destructor)(struct sock *); 175 }; 176 177 extern struct ip6_ra_chain *ip6_ra_chain; 178 extern rwlock_t ip6_ra_lock; 179 180 /* 181 This structure is prepared by protocol, when parsing 182 ancillary data and passed to IPv6. 183 */ 184 185 struct ipv6_txoptions 186 { 187 /* Length of this structure */ 188 int tot_len; 189 190 /* length of extension headers */ 191 192 __u16 opt_flen; /* after fragment hdr */ 193 __u16 opt_nflen; /* before fragment hdr */ 194 195 struct ipv6_opt_hdr *hopopt; 196 struct ipv6_opt_hdr *dst0opt; 197 struct ipv6_rt_hdr *srcrt; /* Routing Header */ 198 struct ipv6_opt_hdr *dst1opt; 199 200 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */ 201 }; 202 203 struct ip6_flowlabel 204 { 205 struct ip6_flowlabel *next; 206 __be32 label; 207 atomic_t users; 208 struct in6_addr dst; 209 struct ipv6_txoptions *opt; 210 unsigned long linger; 211 u8 share; 212 u32 owner; 213 unsigned long lastuse; 214 unsigned long expires; 215 }; 216 217 #define IPV6_FLOWINFO_MASK __constant_htonl(0x0FFFFFFF) 218 #define IPV6_FLOWLABEL_MASK __constant_htonl(0x000FFFFF) 219 220 struct ipv6_fl_socklist 221 { 222 struct ipv6_fl_socklist *next; 223 struct ip6_flowlabel *fl; 224 }; 225 226 extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label); 227 extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space, 228 struct ip6_flowlabel * fl, 229 struct ipv6_txoptions * fopt); 230 extern void fl6_free_socklist(struct sock *sk); 231 extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen); 232 extern void ip6_flowlabel_init(void); 233 extern void ip6_flowlabel_cleanup(void); 234 235 static inline void fl6_sock_release(struct ip6_flowlabel *fl) 236 { 237 if (fl) 238 atomic_dec(&fl->users); 239 } 240 241 extern int ip6_ra_control(struct sock *sk, int sel, 242 void (*destructor)(struct sock *)); 243 244 245 extern int ipv6_parse_hopopts(struct sk_buff **skbp); 246 247 extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt); 248 extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt, 249 int newtype, 250 struct ipv6_opt_hdr __user *newopt, 251 int newoptlen); 252 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space, 253 struct ipv6_txoptions *opt); 254 255 extern int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb); 256 257 extern int ip6_frag_nqueues; 258 extern atomic_t ip6_frag_mem; 259 260 #define IPV6_FRAG_TIMEOUT (60*HZ) /* 60 seconds */ 261 262 /* 263 * Function prototype for build_xmit 264 */ 265 266 typedef int (*inet_getfrag_t) (const void *data, 267 struct in6_addr *addr, 268 char *, 269 unsigned int, unsigned int); 270 271 extern int __ipv6_addr_type(const struct in6_addr *addr); 272 static inline int ipv6_addr_type(const struct in6_addr *addr) 273 { 274 return __ipv6_addr_type(addr) & 0xffff; 275 } 276 277 static inline int ipv6_addr_scope(const struct in6_addr *addr) 278 { 279 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK; 280 } 281 282 static inline int __ipv6_addr_src_scope(int type) 283 { 284 return (type == IPV6_ADDR_ANY ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16)); 285 } 286 287 static inline int ipv6_addr_src_scope(const struct in6_addr *addr) 288 { 289 return __ipv6_addr_src_scope(__ipv6_addr_type(addr)); 290 } 291 292 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2) 293 { 294 return memcmp(a1, a2, sizeof(struct in6_addr)); 295 } 296 297 static inline int 298 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m, 299 const struct in6_addr *a2) 300 { 301 unsigned int i; 302 303 for (i = 0; i < 4; i++) 304 if ((a1->s6_addr32[i] ^ a2->s6_addr32[i]) & m->s6_addr32[i]) 305 return 1; 306 return 0; 307 } 308 309 static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2) 310 { 311 memcpy(a1, a2, sizeof(struct in6_addr)); 312 } 313 314 static inline void ipv6_addr_prefix(struct in6_addr *pfx, 315 const struct in6_addr *addr, 316 int plen) 317 { 318 /* caller must guarantee 0 <= plen <= 128 */ 319 int o = plen >> 3, 320 b = plen & 0x7; 321 322 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr)); 323 memcpy(pfx->s6_addr, addr, o); 324 if (b != 0) 325 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b); 326 } 327 328 static inline void ipv6_addr_set(struct in6_addr *addr, 329 __be32 w1, __be32 w2, 330 __be32 w3, __be32 w4) 331 { 332 addr->s6_addr32[0] = w1; 333 addr->s6_addr32[1] = w2; 334 addr->s6_addr32[2] = w3; 335 addr->s6_addr32[3] = w4; 336 } 337 338 static inline int ipv6_addr_equal(const struct in6_addr *a1, 339 const struct in6_addr *a2) 340 { 341 return (a1->s6_addr32[0] == a2->s6_addr32[0] && 342 a1->s6_addr32[1] == a2->s6_addr32[1] && 343 a1->s6_addr32[2] == a2->s6_addr32[2] && 344 a1->s6_addr32[3] == a2->s6_addr32[3]); 345 } 346 347 static inline int __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2, 348 unsigned int prefixlen) 349 { 350 unsigned pdw, pbi; 351 352 /* check complete u32 in prefix */ 353 pdw = prefixlen >> 5; 354 if (pdw && memcmp(a1, a2, pdw << 2)) 355 return 0; 356 357 /* check incomplete u32 in prefix */ 358 pbi = prefixlen & 0x1f; 359 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi)))) 360 return 0; 361 362 return 1; 363 } 364 365 static inline int ipv6_prefix_equal(const struct in6_addr *a1, 366 const struct in6_addr *a2, 367 unsigned int prefixlen) 368 { 369 return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32, 370 prefixlen); 371 } 372 373 static inline int ipv6_addr_any(const struct in6_addr *a) 374 { 375 return ((a->s6_addr32[0] | a->s6_addr32[1] | 376 a->s6_addr32[2] | a->s6_addr32[3] ) == 0); 377 } 378 379 /* 380 * find the first different bit between two addresses 381 * length of address must be a multiple of 32bits 382 */ 383 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen) 384 { 385 const __be32 *a1 = token1, *a2 = token2; 386 int i; 387 388 addrlen >>= 2; 389 390 for (i = 0; i < addrlen; i++) { 391 __be32 xb = a1[i] ^ a2[i]; 392 if (xb) 393 return i * 32 + 32 - fls(ntohl(xb)); 394 } 395 396 /* 397 * we should *never* get to this point since that 398 * would mean the addrs are equal 399 * 400 * However, we do get to it 8) And exacly, when 401 * addresses are equal 8) 402 * 403 * ip route add 1111::/128 via ... 404 * ip route add 1111::/64 via ... 405 * and we are here. 406 * 407 * Ideally, this function should stop comparison 408 * at prefix length. It does not, but it is still OK, 409 * if returned value is greater than prefix length. 410 * --ANK (980803) 411 */ 412 return (addrlen << 5); 413 } 414 415 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2) 416 { 417 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr)); 418 } 419 420 /* 421 * Prototypes exported by ipv6 422 */ 423 424 /* 425 * rcv function (called from netdevice level) 426 */ 427 428 extern int ipv6_rcv(struct sk_buff *skb, 429 struct net_device *dev, 430 struct packet_type *pt, 431 struct net_device *orig_dev); 432 433 extern int ip6_rcv_finish(struct sk_buff *skb); 434 435 /* 436 * upper-layer output functions 437 */ 438 extern int ip6_xmit(struct sock *sk, 439 struct sk_buff *skb, 440 struct flowi *fl, 441 struct ipv6_txoptions *opt, 442 int ipfragok); 443 444 extern int ip6_nd_hdr(struct sock *sk, 445 struct sk_buff *skb, 446 struct net_device *dev, 447 struct in6_addr *saddr, 448 struct in6_addr *daddr, 449 int proto, int len); 450 451 extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr); 452 453 extern int ip6_append_data(struct sock *sk, 454 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb), 455 void *from, 456 int length, 457 int transhdrlen, 458 int hlimit, 459 int tclass, 460 struct ipv6_txoptions *opt, 461 struct flowi *fl, 462 struct rt6_info *rt, 463 unsigned int flags); 464 465 extern int ip6_push_pending_frames(struct sock *sk); 466 467 extern void ip6_flush_pending_frames(struct sock *sk); 468 469 extern int ip6_dst_lookup(struct sock *sk, 470 struct dst_entry **dst, 471 struct flowi *fl); 472 extern int ip6_sk_dst_lookup(struct sock *sk, 473 struct dst_entry **dst, 474 struct flowi *fl); 475 476 /* 477 * skb processing functions 478 */ 479 480 extern int ip6_output(struct sk_buff *skb); 481 extern int ip6_forward(struct sk_buff *skb); 482 extern int ip6_input(struct sk_buff *skb); 483 extern int ip6_mc_input(struct sk_buff *skb); 484 485 /* 486 * Extension header (options) processing 487 */ 488 489 extern u8 * ipv6_build_nfrag_opts(struct sk_buff *skb, 490 u8 *prev_hdr, 491 struct ipv6_txoptions *opt, 492 struct in6_addr *daddr, 493 u32 jumbolen); 494 extern u8 * ipv6_build_frag_opts(struct sk_buff *skb, 495 u8 *prev_hdr, 496 struct ipv6_txoptions *opt); 497 extern void ipv6_push_nfrag_opts(struct sk_buff *skb, 498 struct ipv6_txoptions *opt, 499 u8 *proto, 500 struct in6_addr **daddr_p); 501 extern void ipv6_push_frag_opts(struct sk_buff *skb, 502 struct ipv6_txoptions *opt, 503 u8 *proto); 504 505 extern int ipv6_skip_exthdr(const struct sk_buff *, int start, 506 u8 *nexthdrp); 507 508 extern int ipv6_ext_hdr(u8 nexthdr); 509 510 extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type); 511 512 extern struct ipv6_txoptions * ipv6_invert_rthdr(struct sock *sk, 513 struct ipv6_rt_hdr *hdr); 514 515 516 /* 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