1 /* 2 * Linux INET6 implementation 3 * 4 * Authors: 5 * Pedro Roque <roque@di.fc.ul.pt> 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License 9 * as published by the Free Software Foundation; either version 10 * 2 of the License, or (at your option) any later version. 11 */ 12 13 #ifndef _NET_IPV6_H 14 #define _NET_IPV6_H 15 16 #include <linux/ipv6.h> 17 #include <linux/hardirq.h> 18 #include <net/if_inet6.h> 19 #include <net/ndisc.h> 20 #include <net/flow.h> 21 #include <net/snmp.h> 22 23 #define SIN6_LEN_RFC2133 24 24 25 #define IPV6_MAXPLEN 65535 26 27 /* 28 * NextHeader field of IPv6 header 29 */ 30 31 #define NEXTHDR_HOP 0 /* Hop-by-hop option header. */ 32 #define NEXTHDR_TCP 6 /* TCP segment. */ 33 #define NEXTHDR_UDP 17 /* UDP message. */ 34 #define NEXTHDR_IPV6 41 /* IPv6 in IPv6 */ 35 #define NEXTHDR_ROUTING 43 /* Routing header. */ 36 #define NEXTHDR_FRAGMENT 44 /* Fragmentation/reassembly header. */ 37 #define NEXTHDR_ESP 50 /* Encapsulating security payload. */ 38 #define NEXTHDR_AUTH 51 /* Authentication header. */ 39 #define NEXTHDR_ICMP 58 /* ICMP for IPv6. */ 40 #define NEXTHDR_NONE 59 /* No next header */ 41 #define NEXTHDR_DEST 60 /* Destination options header. */ 42 #define NEXTHDR_MOBILITY 135 /* Mobility header. */ 43 44 #define NEXTHDR_MAX 255 45 46 47 48 #define IPV6_DEFAULT_HOPLIMIT 64 49 #define IPV6_DEFAULT_MCASTHOPS 1 50 51 /* 52 * Addr type 53 * 54 * type - unicast | multicast 55 * scope - local | site | global 56 * v4 - compat 57 * v4mapped 58 * any 59 * loopback 60 */ 61 62 #define IPV6_ADDR_ANY 0x0000U 63 64 #define IPV6_ADDR_UNICAST 0x0001U 65 #define IPV6_ADDR_MULTICAST 0x0002U 66 67 #define IPV6_ADDR_LOOPBACK 0x0010U 68 #define IPV6_ADDR_LINKLOCAL 0x0020U 69 #define IPV6_ADDR_SITELOCAL 0x0040U 70 71 #define IPV6_ADDR_COMPATv4 0x0080U 72 73 #define IPV6_ADDR_SCOPE_MASK 0x00f0U 74 75 #define IPV6_ADDR_MAPPED 0x1000U 76 #define IPV6_ADDR_RESERVED 0x2000U /* reserved address space */ 77 78 /* 79 * Addr scopes 80 */ 81 #ifdef __KERNEL__ 82 #define IPV6_ADDR_MC_SCOPE(a) \ 83 ((a)->s6_addr[1] & 0x0f) /* nonstandard */ 84 #define __IPV6_ADDR_SCOPE_INVALID -1 85 #endif 86 #define IPV6_ADDR_SCOPE_NODELOCAL 0x01 87 #define IPV6_ADDR_SCOPE_LINKLOCAL 0x02 88 #define IPV6_ADDR_SCOPE_SITELOCAL 0x05 89 #define IPV6_ADDR_SCOPE_ORGLOCAL 0x08 90 #define IPV6_ADDR_SCOPE_GLOBAL 0x0e 91 92 /* 93 * fragmentation header 94 */ 95 96 struct frag_hdr { 97 __u8 nexthdr; 98 __u8 reserved; 99 __be16 frag_off; 100 __be32 identification; 101 }; 102 103 #define IP6_MF 0x0001 104 105 #ifdef __KERNEL__ 106 107 #include <net/sock.h> 108 109 /* sysctls */ 110 extern int sysctl_mld_max_msf; 111 extern struct ctl_path net_ipv6_ctl_path[]; 112 113 #define _DEVINC(net, statname, modifier, idev, field) \ 114 ({ \ 115 struct inet6_dev *_idev = (idev); \ 116 if (likely(_idev != NULL)) \ 117 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \ 118 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\ 119 }) 120 121 #define _DEVADD(net, statname, modifier, idev, field, val) \ 122 ({ \ 123 struct inet6_dev *_idev = (idev); \ 124 if (likely(_idev != NULL)) \ 125 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \ 126 SNMP_ADD_STATS##modifier((net)->mib.statname##_statistics, (field), (val));\ 127 }) 128 129 /* MIBs */ 130 131 #define IP6_INC_STATS(net, idev,field) \ 132 _DEVINC(net, ipv6, , idev, field) 133 #define IP6_INC_STATS_BH(net, idev,field) \ 134 _DEVINC(net, ipv6, _BH, idev, field) 135 #define IP6_ADD_STATS_BH(net, idev,field,val) \ 136 _DEVADD(net, ipv6, _BH, idev, field, val) 137 138 #define ICMP6_INC_STATS(net, idev, field) \ 139 _DEVINC(net, icmpv6, , idev, field) 140 #define ICMP6_INC_STATS_BH(net, idev, field) \ 141 _DEVINC(net, icmpv6, _BH, idev, field) 142 143 #define ICMP6MSGOUT_INC_STATS(net, idev, field) \ 144 _DEVINC(net, icmpv6msg, , idev, field +256) 145 #define ICMP6MSGOUT_INC_STATS_BH(net, idev, field) \ 146 _DEVINC(net, icmpv6msg, _BH, idev, field +256) 147 #define ICMP6MSGIN_INC_STATS_BH(net, idev, field) \ 148 _DEVINC(net, icmpv6msg, _BH, idev, field) 149 150 struct ip6_ra_chain 151 { 152 struct ip6_ra_chain *next; 153 struct sock *sk; 154 int sel; 155 void (*destructor)(struct sock *); 156 }; 157 158 extern struct ip6_ra_chain *ip6_ra_chain; 159 extern rwlock_t ip6_ra_lock; 160 161 /* 162 This structure is prepared by protocol, when parsing 163 ancillary data and passed to IPv6. 164 */ 165 166 struct ipv6_txoptions 167 { 168 /* Length of this structure */ 169 int tot_len; 170 171 /* length of extension headers */ 172 173 __u16 opt_flen; /* after fragment hdr */ 174 __u16 opt_nflen; /* before fragment hdr */ 175 176 struct ipv6_opt_hdr *hopopt; 177 struct ipv6_opt_hdr *dst0opt; 178 struct ipv6_rt_hdr *srcrt; /* Routing Header */ 179 struct ipv6_opt_hdr *dst1opt; 180 181 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */ 182 }; 183 184 struct ip6_flowlabel 185 { 186 struct ip6_flowlabel *next; 187 __be32 label; 188 atomic_t users; 189 struct in6_addr dst; 190 struct ipv6_txoptions *opt; 191 unsigned long linger; 192 u8 share; 193 u32 owner; 194 unsigned long lastuse; 195 unsigned long expires; 196 struct net *fl_net; 197 }; 198 199 #define IPV6_FLOWINFO_MASK __constant_htonl(0x0FFFFFFF) 200 #define IPV6_FLOWLABEL_MASK __constant_htonl(0x000FFFFF) 201 202 struct ipv6_fl_socklist 203 { 204 struct ipv6_fl_socklist *next; 205 struct ip6_flowlabel *fl; 206 }; 207 208 extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label); 209 extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space, 210 struct ip6_flowlabel * fl, 211 struct ipv6_txoptions * fopt); 212 extern void fl6_free_socklist(struct sock *sk); 213 extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen); 214 extern int ip6_flowlabel_init(void); 215 extern void ip6_flowlabel_cleanup(void); 216 217 static inline void fl6_sock_release(struct ip6_flowlabel *fl) 218 { 219 if (fl) 220 atomic_dec(&fl->users); 221 } 222 223 extern int ip6_ra_control(struct sock *sk, int sel); 224 225 extern int ipv6_parse_hopopts(struct sk_buff *skb); 226 227 extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt); 228 extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt, 229 int newtype, 230 struct ipv6_opt_hdr __user *newopt, 231 int newoptlen); 232 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space, 233 struct ipv6_txoptions *opt); 234 235 extern int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb); 236 237 int ip6_frag_nqueues(struct net *net); 238 int ip6_frag_mem(struct net *net); 239 240 #define IPV6_FRAG_TIMEOUT (60*HZ) /* 60 seconds */ 241 242 extern int __ipv6_addr_type(const struct in6_addr *addr); 243 static inline int ipv6_addr_type(const struct in6_addr *addr) 244 { 245 return __ipv6_addr_type(addr) & 0xffff; 246 } 247 248 static inline int ipv6_addr_scope(const struct in6_addr *addr) 249 { 250 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK; 251 } 252 253 static inline int __ipv6_addr_src_scope(int type) 254 { 255 return (type == IPV6_ADDR_ANY ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16)); 256 } 257 258 static inline int ipv6_addr_src_scope(const struct in6_addr *addr) 259 { 260 return __ipv6_addr_src_scope(__ipv6_addr_type(addr)); 261 } 262 263 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2) 264 { 265 return memcmp(a1, a2, sizeof(struct in6_addr)); 266 } 267 268 static inline int 269 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m, 270 const struct in6_addr *a2) 271 { 272 return (!!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) | 273 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) | 274 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) | 275 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]))); 276 } 277 278 static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2) 279 { 280 memcpy(a1, a2, sizeof(struct in6_addr)); 281 } 282 283 static inline void ipv6_addr_prefix(struct in6_addr *pfx, 284 const struct in6_addr *addr, 285 int plen) 286 { 287 /* caller must guarantee 0 <= plen <= 128 */ 288 int o = plen >> 3, 289 b = plen & 0x7; 290 291 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr)); 292 memcpy(pfx->s6_addr, addr, o); 293 if (b != 0) 294 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b); 295 } 296 297 static inline void ipv6_addr_set(struct in6_addr *addr, 298 __be32 w1, __be32 w2, 299 __be32 w3, __be32 w4) 300 { 301 addr->s6_addr32[0] = w1; 302 addr->s6_addr32[1] = w2; 303 addr->s6_addr32[2] = w3; 304 addr->s6_addr32[3] = w4; 305 } 306 307 static inline int ipv6_addr_equal(const struct in6_addr *a1, 308 const struct in6_addr *a2) 309 { 310 return (((a1->s6_addr32[0] ^ a2->s6_addr32[0]) | 311 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) | 312 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) | 313 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0); 314 } 315 316 static inline int __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2, 317 unsigned int prefixlen) 318 { 319 unsigned pdw, pbi; 320 321 /* check complete u32 in prefix */ 322 pdw = prefixlen >> 5; 323 if (pdw && memcmp(a1, a2, pdw << 2)) 324 return 0; 325 326 /* check incomplete u32 in prefix */ 327 pbi = prefixlen & 0x1f; 328 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi)))) 329 return 0; 330 331 return 1; 332 } 333 334 static inline int ipv6_prefix_equal(const struct in6_addr *a1, 335 const struct in6_addr *a2, 336 unsigned int prefixlen) 337 { 338 return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32, 339 prefixlen); 340 } 341 342 struct inet_frag_queue; 343 344 struct ip6_create_arg { 345 __be32 id; 346 struct in6_addr *src; 347 struct in6_addr *dst; 348 }; 349 350 void ip6_frag_init(struct inet_frag_queue *q, void *a); 351 int ip6_frag_match(struct inet_frag_queue *q, void *a); 352 353 static inline int ipv6_addr_any(const struct in6_addr *a) 354 { 355 return ((a->s6_addr32[0] | a->s6_addr32[1] | 356 a->s6_addr32[2] | a->s6_addr32[3] ) == 0); 357 } 358 359 static inline int ipv6_addr_loopback(const struct in6_addr *a) 360 { 361 return ((a->s6_addr32[0] | a->s6_addr32[1] | 362 a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0); 363 } 364 365 static inline int ipv6_addr_v4mapped(const struct in6_addr *a) 366 { 367 return ((a->s6_addr32[0] | a->s6_addr32[1] | 368 (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0); 369 } 370 371 /* 372 * Check for a RFC 4843 ORCHID address 373 * (Overlay Routable Cryptographic Hash Identifiers) 374 */ 375 static inline int ipv6_addr_orchid(const struct in6_addr *a) 376 { 377 return ((a->s6_addr32[0] & htonl(0xfffffff0)) 378 == htonl(0x20010010)); 379 } 380 381 static inline void ipv6_addr_set_v4mapped(const __be32 addr, 382 struct in6_addr *v4mapped) 383 { 384 ipv6_addr_set(v4mapped, 385 0, 0, 386 htonl(0x0000FFFF), 387 addr); 388 } 389 390 /* 391 * find the first different bit between two addresses 392 * length of address must be a multiple of 32bits 393 */ 394 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen) 395 { 396 const __be32 *a1 = token1, *a2 = token2; 397 int i; 398 399 addrlen >>= 2; 400 401 for (i = 0; i < addrlen; i++) { 402 __be32 xb = a1[i] ^ a2[i]; 403 if (xb) 404 return i * 32 + 32 - fls(ntohl(xb)); 405 } 406 407 /* 408 * we should *never* get to this point since that 409 * would mean the addrs are equal 410 * 411 * However, we do get to it 8) And exacly, when 412 * addresses are equal 8) 413 * 414 * ip route add 1111::/128 via ... 415 * ip route add 1111::/64 via ... 416 * and we are here. 417 * 418 * Ideally, this function should stop comparison 419 * at prefix length. It does not, but it is still OK, 420 * if returned value is greater than prefix length. 421 * --ANK (980803) 422 */ 423 return (addrlen << 5); 424 } 425 426 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2) 427 { 428 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr)); 429 } 430 431 /* 432 * Prototypes exported by ipv6 433 */ 434 435 /* 436 * rcv function (called from netdevice level) 437 */ 438 439 extern int ipv6_rcv(struct sk_buff *skb, 440 struct net_device *dev, 441 struct packet_type *pt, 442 struct net_device *orig_dev); 443 444 extern int ip6_rcv_finish(struct sk_buff *skb); 445 446 /* 447 * upper-layer output functions 448 */ 449 extern int ip6_xmit(struct sock *sk, 450 struct sk_buff *skb, 451 struct flowi *fl, 452 struct ipv6_txoptions *opt, 453 int ipfragok); 454 455 extern int ip6_nd_hdr(struct sock *sk, 456 struct sk_buff *skb, 457 struct net_device *dev, 458 const struct in6_addr *saddr, 459 const struct in6_addr *daddr, 460 int proto, int len); 461 462 extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr); 463 464 extern int ip6_append_data(struct sock *sk, 465 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb), 466 void *from, 467 int length, 468 int transhdrlen, 469 int hlimit, 470 int tclass, 471 struct ipv6_txoptions *opt, 472 struct flowi *fl, 473 struct rt6_info *rt, 474 unsigned int flags); 475 476 extern int ip6_push_pending_frames(struct sock *sk); 477 478 extern void ip6_flush_pending_frames(struct sock *sk); 479 480 extern int ip6_dst_lookup(struct sock *sk, 481 struct dst_entry **dst, 482 struct flowi *fl); 483 extern int ip6_dst_blackhole(struct sock *sk, 484 struct dst_entry **dst, 485 struct flowi *fl); 486 extern int ip6_sk_dst_lookup(struct sock *sk, 487 struct dst_entry **dst, 488 struct flowi *fl); 489 490 /* 491 * skb processing functions 492 */ 493 494 extern int ip6_output(struct sk_buff *skb); 495 extern int ip6_forward(struct sk_buff *skb); 496 extern int ip6_input(struct sk_buff *skb); 497 extern int ip6_mc_input(struct sk_buff *skb); 498 499 extern int __ip6_local_out(struct sk_buff *skb); 500 extern int ip6_local_out(struct sk_buff *skb); 501 502 /* 503 * Extension header (options) processing 504 */ 505 506 extern void ipv6_push_nfrag_opts(struct sk_buff *skb, 507 struct ipv6_txoptions *opt, 508 u8 *proto, 509 struct in6_addr **daddr_p); 510 extern void ipv6_push_frag_opts(struct sk_buff *skb, 511 struct ipv6_txoptions *opt, 512 u8 *proto); 513 514 extern int ipv6_skip_exthdr(const struct sk_buff *, int start, 515 u8 *nexthdrp); 516 517 extern int ipv6_ext_hdr(u8 nexthdr); 518 519 extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type); 520 521 /* 522 * socket options (ipv6_sockglue.c) 523 */ 524 525 extern int ipv6_setsockopt(struct sock *sk, int level, 526 int optname, 527 char __user *optval, 528 int optlen); 529 extern int ipv6_getsockopt(struct sock *sk, int level, 530 int optname, 531 char __user *optval, 532 int __user *optlen); 533 extern int compat_ipv6_setsockopt(struct sock *sk, 534 int level, 535 int optname, 536 char __user *optval, 537 int optlen); 538 extern int compat_ipv6_getsockopt(struct sock *sk, 539 int level, 540 int optname, 541 char __user *optval, 542 int __user *optlen); 543 544 extern int ip6_datagram_connect(struct sock *sk, 545 struct sockaddr *addr, int addr_len); 546 547 extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len); 548 extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, 549 u32 info, u8 *payload); 550 extern void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info); 551 552 extern int inet6_release(struct socket *sock); 553 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr, 554 int addr_len); 555 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 556 int *uaddr_len, int peer); 557 extern int inet6_ioctl(struct socket *sock, unsigned int cmd, 558 unsigned long arg); 559 560 extern int inet6_hash_connect(struct inet_timewait_death_row *death_row, 561 struct sock *sk); 562 563 /* 564 * reassembly.c 565 */ 566 extern const struct proto_ops inet6_stream_ops; 567 extern const struct proto_ops inet6_dgram_ops; 568 569 struct group_source_req; 570 struct group_filter; 571 572 extern int ip6_mc_source(int add, int omode, struct sock *sk, 573 struct group_source_req *pgsr); 574 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf); 575 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 576 struct group_filter __user *optval, 577 int __user *optlen); 578 extern unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr, 579 const struct in6_addr *daddr, u32 rnd); 580 581 #ifdef CONFIG_PROC_FS 582 extern int ac6_proc_init(struct net *net); 583 extern void ac6_proc_exit(struct net *net); 584 extern int raw6_proc_init(void); 585 extern void raw6_proc_exit(void); 586 extern int tcp6_proc_init(struct net *net); 587 extern void tcp6_proc_exit(struct net *net); 588 extern int udp6_proc_init(struct net *net); 589 extern void udp6_proc_exit(struct net *net); 590 extern int udplite6_proc_init(void); 591 extern void udplite6_proc_exit(void); 592 extern int ipv6_misc_proc_init(void); 593 extern void ipv6_misc_proc_exit(void); 594 extern int snmp6_register_dev(struct inet6_dev *idev); 595 extern int snmp6_unregister_dev(struct inet6_dev *idev); 596 597 #else 598 static inline int ac6_proc_init(struct net *net) { return 0; } 599 static inline void ac6_proc_exit(struct net *net) { } 600 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; } 601 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; } 602 #endif 603 604 #ifdef CONFIG_SYSCTL 605 extern ctl_table ipv6_route_table_template[]; 606 extern ctl_table ipv6_icmp_table_template[]; 607 608 extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net); 609 extern struct ctl_table *ipv6_route_sysctl_init(struct net *net); 610 extern int ipv6_sysctl_register(void); 611 extern void ipv6_sysctl_unregister(void); 612 extern int ipv6_static_sysctl_register(void); 613 extern void ipv6_static_sysctl_unregister(void); 614 #endif 615 616 #endif /* __KERNEL__ */ 617 #endif /* _NET_IPV6_H */ 618