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; 113 114 extern struct ctl_path net_ipv6_ctl_path[]; 115 116 #define _DEVINC(statname, modifier, idev, field) \ 117 ({ \ 118 struct inet6_dev *_idev = (idev); \ 119 if (likely(_idev != NULL)) \ 120 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \ 121 SNMP_INC_STATS##modifier(statname##_statistics, (field)); \ 122 }) 123 124 #define _DEVADD(statname, modifier, idev, field, val) \ 125 ({ \ 126 struct inet6_dev *_idev = (idev); \ 127 if (likely(_idev != NULL)) \ 128 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \ 129 SNMP_ADD_STATS##modifier(statname##_statistics, (field), (val));\ 130 }) 131 132 /* MIBs */ 133 DECLARE_SNMP_STAT(struct ipstats_mib, ipv6_statistics); 134 135 #define IP6_INC_STATS(idev,field) _DEVINC(ipv6, , idev, field) 136 #define IP6_INC_STATS_BH(idev,field) _DEVINC(ipv6, _BH, idev, field) 137 #define IP6_INC_STATS_USER(idev,field) _DEVINC(ipv6, _USER, idev, field) 138 #define IP6_ADD_STATS_BH(idev,field,val) _DEVADD(ipv6, _BH, idev, field, val) 139 140 DECLARE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics); 141 DECLARE_SNMP_STAT(struct icmpv6msg_mib, icmpv6msg_statistics); 142 143 #define ICMP6_INC_STATS(idev, field) _DEVINC(icmpv6, , idev, field) 144 #define ICMP6_INC_STATS_BH(idev, field) _DEVINC(icmpv6, _BH, idev, field) 145 #define ICMP6_INC_STATS_USER(idev, field) _DEVINC(icmpv6, _USER, idev, field) 146 147 #define ICMP6MSGOUT_INC_STATS(idev, field) \ 148 _DEVINC(icmpv6msg, , idev, field +256) 149 #define ICMP6MSGOUT_INC_STATS_BH(idev, field) \ 150 _DEVINC(icmpv6msg, _BH, idev, field +256) 151 #define ICMP6MSGOUT_INC_STATS_USER(idev, field) \ 152 _DEVINC(icmpv6msg, _USER, idev, field +256) 153 #define ICMP6MSGIN_INC_STATS(idev, field) \ 154 _DEVINC(icmpv6msg, , idev, field) 155 #define ICMP6MSGIN_INC_STATS_BH(idev, field) \ 156 _DEVINC(icmpv6msg, _BH, idev, field) 157 #define ICMP6MSGIN_INC_STATS_USER(idev, field) \ 158 _DEVINC(icmpv6msg, _USER, idev, field) 159 160 struct ip6_ra_chain 161 { 162 struct ip6_ra_chain *next; 163 struct sock *sk; 164 int sel; 165 void (*destructor)(struct sock *); 166 }; 167 168 extern struct ip6_ra_chain *ip6_ra_chain; 169 extern rwlock_t ip6_ra_lock; 170 171 /* 172 This structure is prepared by protocol, when parsing 173 ancillary data and passed to IPv6. 174 */ 175 176 struct ipv6_txoptions 177 { 178 /* Length of this structure */ 179 int tot_len; 180 181 /* length of extension headers */ 182 183 __u16 opt_flen; /* after fragment hdr */ 184 __u16 opt_nflen; /* before fragment hdr */ 185 186 struct ipv6_opt_hdr *hopopt; 187 struct ipv6_opt_hdr *dst0opt; 188 struct ipv6_rt_hdr *srcrt; /* Routing Header */ 189 struct ipv6_opt_hdr *dst1opt; 190 191 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */ 192 }; 193 194 struct ip6_flowlabel 195 { 196 struct ip6_flowlabel *next; 197 __be32 label; 198 atomic_t users; 199 struct in6_addr dst; 200 struct ipv6_txoptions *opt; 201 unsigned long linger; 202 u8 share; 203 u32 owner; 204 unsigned long lastuse; 205 unsigned long expires; 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 /* 254 * Function prototype for build_xmit 255 */ 256 257 typedef int (*inet_getfrag_t) (const void *data, 258 struct in6_addr *addr, 259 char *, 260 unsigned int, unsigned int); 261 262 extern int __ipv6_addr_type(const struct in6_addr *addr); 263 static inline int ipv6_addr_type(const struct in6_addr *addr) 264 { 265 return __ipv6_addr_type(addr) & 0xffff; 266 } 267 268 static inline int ipv6_addr_scope(const struct in6_addr *addr) 269 { 270 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK; 271 } 272 273 static inline int __ipv6_addr_src_scope(int type) 274 { 275 return (type == IPV6_ADDR_ANY ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16)); 276 } 277 278 static inline int ipv6_addr_src_scope(const struct in6_addr *addr) 279 { 280 return __ipv6_addr_src_scope(__ipv6_addr_type(addr)); 281 } 282 283 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2) 284 { 285 return memcmp(a1, a2, sizeof(struct in6_addr)); 286 } 287 288 static inline int 289 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m, 290 const struct in6_addr *a2) 291 { 292 unsigned int i; 293 294 for (i = 0; i < 4; i++) 295 if ((a1->s6_addr32[i] ^ a2->s6_addr32[i]) & m->s6_addr32[i]) 296 return 1; 297 return 0; 298 } 299 300 static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2) 301 { 302 memcpy(a1, a2, sizeof(struct in6_addr)); 303 } 304 305 static inline void ipv6_addr_prefix(struct in6_addr *pfx, 306 const struct in6_addr *addr, 307 int plen) 308 { 309 /* caller must guarantee 0 <= plen <= 128 */ 310 int o = plen >> 3, 311 b = plen & 0x7; 312 313 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr)); 314 memcpy(pfx->s6_addr, addr, o); 315 if (b != 0) 316 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b); 317 } 318 319 static inline void ipv6_addr_set(struct in6_addr *addr, 320 __be32 w1, __be32 w2, 321 __be32 w3, __be32 w4) 322 { 323 addr->s6_addr32[0] = w1; 324 addr->s6_addr32[1] = w2; 325 addr->s6_addr32[2] = w3; 326 addr->s6_addr32[3] = w4; 327 } 328 329 static inline int ipv6_addr_equal(const struct in6_addr *a1, 330 const struct in6_addr *a2) 331 { 332 return (a1->s6_addr32[0] == a2->s6_addr32[0] && 333 a1->s6_addr32[1] == a2->s6_addr32[1] && 334 a1->s6_addr32[2] == a2->s6_addr32[2] && 335 a1->s6_addr32[3] == a2->s6_addr32[3]); 336 } 337 338 static inline int __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2, 339 unsigned int prefixlen) 340 { 341 unsigned pdw, pbi; 342 343 /* check complete u32 in prefix */ 344 pdw = prefixlen >> 5; 345 if (pdw && memcmp(a1, a2, pdw << 2)) 346 return 0; 347 348 /* check incomplete u32 in prefix */ 349 pbi = prefixlen & 0x1f; 350 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi)))) 351 return 0; 352 353 return 1; 354 } 355 356 static inline int ipv6_prefix_equal(const struct in6_addr *a1, 357 const struct in6_addr *a2, 358 unsigned int prefixlen) 359 { 360 return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32, 361 prefixlen); 362 } 363 364 struct inet_frag_queue; 365 366 struct ip6_create_arg { 367 __be32 id; 368 struct in6_addr *src; 369 struct in6_addr *dst; 370 }; 371 372 void ip6_frag_init(struct inet_frag_queue *q, void *a); 373 int ip6_frag_match(struct inet_frag_queue *q, void *a); 374 375 static inline int ipv6_addr_any(const struct in6_addr *a) 376 { 377 return ((a->s6_addr32[0] | a->s6_addr32[1] | 378 a->s6_addr32[2] | a->s6_addr32[3] ) == 0); 379 } 380 381 static inline int ipv6_addr_v4mapped(const struct in6_addr *a) 382 { 383 return ((a->s6_addr32[0] | a->s6_addr32[1]) == 0 && 384 a->s6_addr32[2] == htonl(0x0000ffff)); 385 } 386 387 /* 388 * find the first different bit between two addresses 389 * length of address must be a multiple of 32bits 390 */ 391 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen) 392 { 393 const __be32 *a1 = token1, *a2 = token2; 394 int i; 395 396 addrlen >>= 2; 397 398 for (i = 0; i < addrlen; i++) { 399 __be32 xb = a1[i] ^ a2[i]; 400 if (xb) 401 return i * 32 + 32 - fls(ntohl(xb)); 402 } 403 404 /* 405 * we should *never* get to this point since that 406 * would mean the addrs are equal 407 * 408 * However, we do get to it 8) And exacly, when 409 * addresses are equal 8) 410 * 411 * ip route add 1111::/128 via ... 412 * ip route add 1111::/64 via ... 413 * and we are here. 414 * 415 * Ideally, this function should stop comparison 416 * at prefix length. It does not, but it is still OK, 417 * if returned value is greater than prefix length. 418 * --ANK (980803) 419 */ 420 return (addrlen << 5); 421 } 422 423 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2) 424 { 425 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr)); 426 } 427 428 /* 429 * Prototypes exported by ipv6 430 */ 431 432 /* 433 * rcv function (called from netdevice level) 434 */ 435 436 extern int ipv6_rcv(struct sk_buff *skb, 437 struct net_device *dev, 438 struct packet_type *pt, 439 struct net_device *orig_dev); 440 441 extern int ip6_rcv_finish(struct sk_buff *skb); 442 443 /* 444 * upper-layer output functions 445 */ 446 extern int ip6_xmit(struct sock *sk, 447 struct sk_buff *skb, 448 struct flowi *fl, 449 struct ipv6_txoptions *opt, 450 int ipfragok); 451 452 extern int ip6_nd_hdr(struct sock *sk, 453 struct sk_buff *skb, 454 struct net_device *dev, 455 struct in6_addr *saddr, 456 struct in6_addr *daddr, 457 int proto, int len); 458 459 extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr); 460 461 extern int ip6_append_data(struct sock *sk, 462 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb), 463 void *from, 464 int length, 465 int transhdrlen, 466 int hlimit, 467 int tclass, 468 struct ipv6_txoptions *opt, 469 struct flowi *fl, 470 struct rt6_info *rt, 471 unsigned int flags); 472 473 extern int ip6_push_pending_frames(struct sock *sk); 474 475 extern void ip6_flush_pending_frames(struct sock *sk); 476 477 extern int ip6_dst_lookup(struct sock *sk, 478 struct dst_entry **dst, 479 struct flowi *fl); 480 extern int ip6_dst_blackhole(struct sock *sk, 481 struct dst_entry **dst, 482 struct flowi *fl); 483 extern int ip6_sk_dst_lookup(struct sock *sk, 484 struct dst_entry **dst, 485 struct flowi *fl); 486 487 /* 488 * skb processing functions 489 */ 490 491 extern int ip6_output(struct sk_buff *skb); 492 extern int ip6_forward(struct sk_buff *skb); 493 extern int ip6_input(struct sk_buff *skb); 494 extern int ip6_mc_input(struct sk_buff *skb); 495 496 extern int __ip6_local_out(struct sk_buff *skb); 497 extern int ip6_local_out(struct sk_buff *skb); 498 499 /* 500 * Extension header (options) processing 501 */ 502 503 extern u8 * ipv6_build_nfrag_opts(struct sk_buff *skb, 504 u8 *prev_hdr, 505 struct ipv6_txoptions *opt, 506 struct in6_addr *daddr, 507 u32 jumbolen); 508 extern u8 * ipv6_build_frag_opts(struct sk_buff *skb, 509 u8 *prev_hdr, 510 struct ipv6_txoptions *opt); 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 ipv6_packet_init(void); 550 551 extern void ipv6_packet_cleanup(void); 552 553 extern int ip6_datagram_connect(struct sock *sk, 554 struct sockaddr *addr, int addr_len); 555 556 extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len); 557 extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, 558 u32 info, u8 *payload); 559 extern void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info); 560 561 extern int inet6_release(struct socket *sock); 562 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr, 563 int addr_len); 564 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 565 int *uaddr_len, int peer); 566 extern int inet6_ioctl(struct socket *sock, unsigned int cmd, 567 unsigned long arg); 568 569 extern int inet6_hash_connect(struct inet_timewait_death_row *death_row, 570 struct sock *sk); 571 572 /* 573 * reassembly.c 574 */ 575 extern const struct proto_ops inet6_stream_ops; 576 extern const struct proto_ops inet6_dgram_ops; 577 578 struct group_source_req; 579 struct group_filter; 580 581 extern int ip6_mc_source(int add, int omode, struct sock *sk, 582 struct group_source_req *pgsr); 583 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf); 584 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 585 struct group_filter __user *optval, 586 int __user *optlen); 587 588 #ifdef CONFIG_PROC_FS 589 extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net); 590 extern struct ctl_table *ipv6_route_sysctl_init(struct net *net); 591 592 extern int ac6_proc_init(void); 593 extern void ac6_proc_exit(void); 594 extern int raw6_proc_init(void); 595 extern void raw6_proc_exit(void); 596 extern int tcp6_proc_init(void); 597 extern void tcp6_proc_exit(void); 598 extern int udp6_proc_init(void); 599 extern void udp6_proc_exit(void); 600 extern int udplite6_proc_init(void); 601 extern void udplite6_proc_exit(void); 602 extern int ipv6_misc_proc_init(void); 603 extern void ipv6_misc_proc_exit(void); 604 extern int snmp6_register_dev(struct inet6_dev *idev); 605 extern int snmp6_unregister_dev(struct inet6_dev *idev); 606 607 extern struct rt6_statistics rt6_stats; 608 #else 609 static inline int snmp6_register_dev(struct inet6_dev *idev) 610 { 611 return 0; 612 } 613 614 static inline int snmp6_unregister_dev(struct inet6_dev *idev) 615 { 616 return 0; 617 } 618 #endif 619 620 #ifdef CONFIG_SYSCTL 621 extern ctl_table ipv6_route_table_template[]; 622 extern ctl_table ipv6_icmp_table_template[]; 623 624 extern int ipv6_sysctl_register(void); 625 extern void ipv6_sysctl_unregister(void); 626 #endif 627 628 #endif /* __KERNEL__ */ 629 #endif /* _NET_IPV6_H */ 630