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 /* MIBs */ 124 DECLARE_SNMP_STAT(struct ipstats_mib, ipv6_statistics); 125 126 #define IP6_INC_STATS(idev,field) _DEVINC(ipv6, , idev, field) 127 #define IP6_INC_STATS_BH(idev,field) _DEVINC(ipv6, _BH, idev, field) 128 #define IP6_INC_STATS_USER(idev,field) _DEVINC(ipv6, _USER, idev, field) 129 130 DECLARE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics); 131 DECLARE_SNMP_STAT(struct icmpv6msg_mib, icmpv6msg_statistics); 132 133 #define ICMP6_INC_STATS(idev, field) _DEVINC(icmpv6, , idev, field) 134 #define ICMP6_INC_STATS_BH(idev, field) _DEVINC(icmpv6, _BH, idev, field) 135 #define ICMP6_INC_STATS_USER(idev, field) _DEVINC(icmpv6, _USER, idev, field) 136 137 #define ICMP6_INC_STATS_OFFSET_BH(idev, field, offset) ({ \ 138 struct inet6_dev *_idev = idev; \ 139 __typeof__(offset) _offset = (offset); \ 140 if (likely(_idev != NULL)) \ 141 SNMP_INC_STATS_OFFSET_BH(_idev->stats.icmpv6, field, _offset); \ 142 SNMP_INC_STATS_OFFSET_BH(icmpv6_statistics, field, _offset); \ 143 }) 144 145 #define ICMP6MSGOUT_INC_STATS(idev, field) \ 146 _DEVINC(icmpv6msg, , idev, field +256) 147 #define ICMP6MSGOUT_INC_STATS_BH(idev, field) \ 148 _DEVINC(icmpv6msg, _BH, idev, field +256) 149 #define ICMP6MSGOUT_INC_STATS_USER(idev, field) \ 150 _DEVINC(icmpv6msg, _USER, idev, field +256) 151 #define ICMP6MSGIN_INC_STATS(idev, field) \ 152 _DEVINC(icmpv6msg, , idev, field) 153 #define ICMP6MSGIN_INC_STATS_BH(idev, field) \ 154 _DEVINC(icmpv6msg, _BH, idev, field) 155 #define ICMP6MSGIN_INC_STATS_USER(idev, field) \ 156 _DEVINC(icmpv6msg, _USER, idev, field) 157 158 DECLARE_SNMP_STAT(struct udp_mib, udp_stats_in6); 159 DECLARE_SNMP_STAT(struct udp_mib, udplite_stats_in6); 160 #define UDP6_INC_STATS_BH(field, is_udplite) do { \ 161 if (is_udplite) SNMP_INC_STATS_BH(udplite_stats_in6, field); \ 162 else SNMP_INC_STATS_BH(udp_stats_in6, field); } while(0) 163 #define UDP6_INC_STATS_USER(field, is_udplite) do { \ 164 if (is_udplite) SNMP_INC_STATS_USER(udplite_stats_in6, field); \ 165 else SNMP_INC_STATS_USER(udp_stats_in6, field); } while(0) 166 167 struct ip6_ra_chain 168 { 169 struct ip6_ra_chain *next; 170 struct sock *sk; 171 int sel; 172 void (*destructor)(struct sock *); 173 }; 174 175 extern struct ip6_ra_chain *ip6_ra_chain; 176 extern rwlock_t ip6_ra_lock; 177 178 /* 179 This structure is prepared by protocol, when parsing 180 ancillary data and passed to IPv6. 181 */ 182 183 struct ipv6_txoptions 184 { 185 /* Length of this structure */ 186 int tot_len; 187 188 /* length of extension headers */ 189 190 __u16 opt_flen; /* after fragment hdr */ 191 __u16 opt_nflen; /* before fragment hdr */ 192 193 struct ipv6_opt_hdr *hopopt; 194 struct ipv6_opt_hdr *dst0opt; 195 struct ipv6_rt_hdr *srcrt; /* Routing Header */ 196 struct ipv6_opt_hdr *dst1opt; 197 198 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */ 199 }; 200 201 struct ip6_flowlabel 202 { 203 struct ip6_flowlabel *next; 204 __be32 label; 205 atomic_t users; 206 struct in6_addr dst; 207 struct ipv6_txoptions *opt; 208 unsigned long linger; 209 u8 share; 210 u32 owner; 211 unsigned long lastuse; 212 unsigned long expires; 213 }; 214 215 #define IPV6_FLOWINFO_MASK __constant_htonl(0x0FFFFFFF) 216 #define IPV6_FLOWLABEL_MASK __constant_htonl(0x000FFFFF) 217 218 struct ipv6_fl_socklist 219 { 220 struct ipv6_fl_socklist *next; 221 struct ip6_flowlabel *fl; 222 }; 223 224 extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label); 225 extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space, 226 struct ip6_flowlabel * fl, 227 struct ipv6_txoptions * fopt); 228 extern void fl6_free_socklist(struct sock *sk); 229 extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen); 230 extern void ip6_flowlabel_init(void); 231 extern void ip6_flowlabel_cleanup(void); 232 233 static inline void fl6_sock_release(struct ip6_flowlabel *fl) 234 { 235 if (fl) 236 atomic_dec(&fl->users); 237 } 238 239 extern int ip6_ra_control(struct sock *sk, int sel, 240 void (*destructor)(struct sock *)); 241 242 243 extern int ipv6_parse_hopopts(struct sk_buff **skbp); 244 245 extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt); 246 extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt, 247 int newtype, 248 struct ipv6_opt_hdr __user *newopt, 249 int newoptlen); 250 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space, 251 struct ipv6_txoptions *opt); 252 253 extern int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb); 254 255 extern int ip6_frag_nqueues; 256 extern atomic_t ip6_frag_mem; 257 258 #define IPV6_FRAG_TIMEOUT (60*HZ) /* 60 seconds */ 259 260 /* 261 * Function prototype for build_xmit 262 */ 263 264 typedef int (*inet_getfrag_t) (const void *data, 265 struct in6_addr *addr, 266 char *, 267 unsigned int, unsigned int); 268 269 extern int __ipv6_addr_type(const struct in6_addr *addr); 270 static inline int ipv6_addr_type(const struct in6_addr *addr) 271 { 272 return __ipv6_addr_type(addr) & 0xffff; 273 } 274 275 static inline int ipv6_addr_scope(const struct in6_addr *addr) 276 { 277 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK; 278 } 279 280 static inline int __ipv6_addr_src_scope(int type) 281 { 282 return (type == IPV6_ADDR_ANY ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16)); 283 } 284 285 static inline int ipv6_addr_src_scope(const struct in6_addr *addr) 286 { 287 return __ipv6_addr_src_scope(__ipv6_addr_type(addr)); 288 } 289 290 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2) 291 { 292 return memcmp(a1, a2, sizeof(struct in6_addr)); 293 } 294 295 static inline int 296 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m, 297 const struct in6_addr *a2) 298 { 299 unsigned int i; 300 301 for (i = 0; i < 4; i++) 302 if ((a1->s6_addr32[i] ^ a2->s6_addr32[i]) & m->s6_addr32[i]) 303 return 1; 304 return 0; 305 } 306 307 static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2) 308 { 309 memcpy(a1, a2, sizeof(struct in6_addr)); 310 } 311 312 static inline void ipv6_addr_prefix(struct in6_addr *pfx, 313 const struct in6_addr *addr, 314 int plen) 315 { 316 /* caller must guarantee 0 <= plen <= 128 */ 317 int o = plen >> 3, 318 b = plen & 0x7; 319 320 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr)); 321 memcpy(pfx->s6_addr, addr, o); 322 if (b != 0) 323 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b); 324 } 325 326 static inline void ipv6_addr_set(struct in6_addr *addr, 327 __be32 w1, __be32 w2, 328 __be32 w3, __be32 w4) 329 { 330 addr->s6_addr32[0] = w1; 331 addr->s6_addr32[1] = w2; 332 addr->s6_addr32[2] = w3; 333 addr->s6_addr32[3] = w4; 334 } 335 336 static inline int ipv6_addr_equal(const struct in6_addr *a1, 337 const struct in6_addr *a2) 338 { 339 return (a1->s6_addr32[0] == a2->s6_addr32[0] && 340 a1->s6_addr32[1] == a2->s6_addr32[1] && 341 a1->s6_addr32[2] == a2->s6_addr32[2] && 342 a1->s6_addr32[3] == a2->s6_addr32[3]); 343 } 344 345 static inline int __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2, 346 unsigned int prefixlen) 347 { 348 unsigned pdw, pbi; 349 350 /* check complete u32 in prefix */ 351 pdw = prefixlen >> 5; 352 if (pdw && memcmp(a1, a2, pdw << 2)) 353 return 0; 354 355 /* check incomplete u32 in prefix */ 356 pbi = prefixlen & 0x1f; 357 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi)))) 358 return 0; 359 360 return 1; 361 } 362 363 static inline int ipv6_prefix_equal(const struct in6_addr *a1, 364 const struct in6_addr *a2, 365 unsigned int prefixlen) 366 { 367 return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32, 368 prefixlen); 369 } 370 371 static inline int ipv6_addr_any(const struct in6_addr *a) 372 { 373 return ((a->s6_addr32[0] | a->s6_addr32[1] | 374 a->s6_addr32[2] | a->s6_addr32[3] ) == 0); 375 } 376 377 static inline int ipv6_addr_v4mapped(const struct in6_addr *a) 378 { 379 return ((a->s6_addr32[0] | a->s6_addr32[1]) == 0 && 380 a->s6_addr32[2] == htonl(0x0000ffff)); 381 } 382 383 /* 384 * find the first different bit between two addresses 385 * length of address must be a multiple of 32bits 386 */ 387 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen) 388 { 389 const __be32 *a1 = token1, *a2 = token2; 390 int i; 391 392 addrlen >>= 2; 393 394 for (i = 0; i < addrlen; i++) { 395 __be32 xb = a1[i] ^ a2[i]; 396 if (xb) 397 return i * 32 + 32 - fls(ntohl(xb)); 398 } 399 400 /* 401 * we should *never* get to this point since that 402 * would mean the addrs are equal 403 * 404 * However, we do get to it 8) And exacly, when 405 * addresses are equal 8) 406 * 407 * ip route add 1111::/128 via ... 408 * ip route add 1111::/64 via ... 409 * and we are here. 410 * 411 * Ideally, this function should stop comparison 412 * at prefix length. It does not, but it is still OK, 413 * if returned value is greater than prefix length. 414 * --ANK (980803) 415 */ 416 return (addrlen << 5); 417 } 418 419 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2) 420 { 421 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr)); 422 } 423 424 /* 425 * Prototypes exported by ipv6 426 */ 427 428 /* 429 * rcv function (called from netdevice level) 430 */ 431 432 extern int ipv6_rcv(struct sk_buff *skb, 433 struct net_device *dev, 434 struct packet_type *pt, 435 struct net_device *orig_dev); 436 437 extern int ip6_rcv_finish(struct sk_buff *skb); 438 439 /* 440 * upper-layer output functions 441 */ 442 extern int ip6_xmit(struct sock *sk, 443 struct sk_buff *skb, 444 struct flowi *fl, 445 struct ipv6_txoptions *opt, 446 int ipfragok); 447 448 extern int ip6_nd_hdr(struct sock *sk, 449 struct sk_buff *skb, 450 struct net_device *dev, 451 struct in6_addr *saddr, 452 struct in6_addr *daddr, 453 int proto, int len); 454 455 extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr); 456 457 extern int ip6_append_data(struct sock *sk, 458 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb), 459 void *from, 460 int length, 461 int transhdrlen, 462 int hlimit, 463 int tclass, 464 struct ipv6_txoptions *opt, 465 struct flowi *fl, 466 struct rt6_info *rt, 467 unsigned int flags); 468 469 extern int ip6_push_pending_frames(struct sock *sk); 470 471 extern void ip6_flush_pending_frames(struct sock *sk); 472 473 extern int ip6_dst_lookup(struct sock *sk, 474 struct dst_entry **dst, 475 struct flowi *fl); 476 extern int ip6_dst_blackhole(struct sock *sk, 477 struct dst_entry **dst, 478 struct flowi *fl); 479 extern int ip6_sk_dst_lookup(struct sock *sk, 480 struct dst_entry **dst, 481 struct flowi *fl); 482 483 /* 484 * skb processing functions 485 */ 486 487 extern int ip6_output(struct sk_buff *skb); 488 extern int ip6_forward(struct sk_buff *skb); 489 extern int ip6_input(struct sk_buff *skb); 490 extern int ip6_mc_input(struct sk_buff *skb); 491 492 /* 493 * Extension header (options) processing 494 */ 495 496 extern u8 * ipv6_build_nfrag_opts(struct sk_buff *skb, 497 u8 *prev_hdr, 498 struct ipv6_txoptions *opt, 499 struct in6_addr *daddr, 500 u32 jumbolen); 501 extern u8 * ipv6_build_frag_opts(struct sk_buff *skb, 502 u8 *prev_hdr, 503 struct ipv6_txoptions *opt); 504 extern void ipv6_push_nfrag_opts(struct sk_buff *skb, 505 struct ipv6_txoptions *opt, 506 u8 *proto, 507 struct in6_addr **daddr_p); 508 extern void ipv6_push_frag_opts(struct sk_buff *skb, 509 struct ipv6_txoptions *opt, 510 u8 *proto); 511 512 extern int ipv6_skip_exthdr(const struct sk_buff *, int start, 513 u8 *nexthdrp); 514 515 extern int ipv6_ext_hdr(u8 nexthdr); 516 517 extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type); 518 519 /* 520 * socket options (ipv6_sockglue.c) 521 */ 522 523 extern int ipv6_setsockopt(struct sock *sk, int level, 524 int optname, 525 char __user *optval, 526 int optlen); 527 extern int ipv6_getsockopt(struct sock *sk, int level, 528 int optname, 529 char __user *optval, 530 int __user *optlen); 531 extern int compat_ipv6_setsockopt(struct sock *sk, 532 int level, 533 int optname, 534 char __user *optval, 535 int optlen); 536 extern int compat_ipv6_getsockopt(struct sock *sk, 537 int level, 538 int optname, 539 char __user *optval, 540 int __user *optlen); 541 542 extern void ipv6_packet_init(void); 543 544 extern void ipv6_packet_cleanup(void); 545 546 extern int ip6_datagram_connect(struct sock *sk, 547 struct sockaddr *addr, int addr_len); 548 549 extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len); 550 extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, 551 u32 info, u8 *payload); 552 extern void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info); 553 554 extern int inet6_release(struct socket *sock); 555 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr, 556 int addr_len); 557 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 558 int *uaddr_len, int peer); 559 extern int inet6_ioctl(struct socket *sock, unsigned int cmd, 560 unsigned long arg); 561 562 extern int inet6_hash_connect(struct inet_timewait_death_row *death_row, 563 struct sock *sk); 564 565 /* 566 * reassembly.c 567 */ 568 extern int sysctl_ip6frag_high_thresh; 569 extern int sysctl_ip6frag_low_thresh; 570 extern int sysctl_ip6frag_time; 571 extern int sysctl_ip6frag_secret_interval; 572 573 extern const struct proto_ops inet6_stream_ops; 574 extern const struct proto_ops inet6_dgram_ops; 575 576 struct group_source_req; 577 struct group_filter; 578 579 extern int ip6_mc_source(int add, int omode, struct sock *sk, 580 struct group_source_req *pgsr); 581 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf); 582 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 583 struct group_filter __user *optval, 584 int __user *optlen); 585 586 #ifdef CONFIG_PROC_FS 587 extern int ac6_proc_init(void); 588 extern void ac6_proc_exit(void); 589 extern int raw6_proc_init(void); 590 extern void raw6_proc_exit(void); 591 extern int tcp6_proc_init(void); 592 extern void tcp6_proc_exit(void); 593 extern int udp6_proc_init(void); 594 extern void udp6_proc_exit(void); 595 extern int udplite6_proc_init(void); 596 extern void udplite6_proc_exit(void); 597 extern int ipv6_misc_proc_init(void); 598 extern void ipv6_misc_proc_exit(void); 599 extern int snmp6_register_dev(struct inet6_dev *idev); 600 extern int snmp6_unregister_dev(struct inet6_dev *idev); 601 602 extern struct rt6_statistics rt6_stats; 603 #else 604 static inline int snmp6_register_dev(struct inet6_dev *idev) 605 { 606 return 0; 607 } 608 609 static inline int snmp6_unregister_dev(struct inet6_dev *idev) 610 { 611 return 0; 612 } 613 #endif 614 615 #ifdef CONFIG_SYSCTL 616 extern ctl_table ipv6_route_table[]; 617 extern ctl_table ipv6_icmp_table[]; 618 619 extern void ipv6_sysctl_register(void); 620 extern void ipv6_sysctl_unregister(void); 621 #endif 622 623 #endif /* __KERNEL__ */ 624 #endif /* _NET_IPV6_H */ 625