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 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 unsigned char nexthdr; 98 unsigned char reserved; 99 unsigned short frag_off; 100 __u32 identification; 101 }; 102 103 #define IP6_MF 0x0001 104 105 #ifdef __KERNEL__ 106 107 #include <linux/config.h> 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(field) SNMP_INC_STATS(ipv6_statistics, field) 117 #define IP6_INC_STATS_BH(field) SNMP_INC_STATS_BH(ipv6_statistics, field) 118 #define IP6_INC_STATS_USER(field) SNMP_INC_STATS_USER(ipv6_statistics, field) 119 DECLARE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics); 120 #define ICMP6_INC_STATS(idev, field) ({ \ 121 struct inet6_dev *_idev = (idev); \ 122 if (likely(_idev != NULL)) \ 123 SNMP_INC_STATS(idev->stats.icmpv6, field); \ 124 SNMP_INC_STATS(icmpv6_statistics, field); \ 125 }) 126 #define ICMP6_INC_STATS_BH(idev, field) ({ \ 127 struct inet6_dev *_idev = (idev); \ 128 if (likely(_idev != NULL)) \ 129 SNMP_INC_STATS_BH((_idev)->stats.icmpv6, field); \ 130 SNMP_INC_STATS_BH(icmpv6_statistics, field); \ 131 }) 132 #define ICMP6_INC_STATS_USER(idev, field) ({ \ 133 struct inet6_dev *_idev = (idev); \ 134 if (likely(_idev != NULL)) \ 135 SNMP_INC_STATS_USER(_idev->stats.icmpv6, field); \ 136 SNMP_INC_STATS_USER(icmpv6_statistics, field); \ 137 }) 138 #define ICMP6_INC_STATS_OFFSET_BH(idev, field, offset) ({ \ 139 struct inet6_dev *_idev = idev; \ 140 __typeof__(offset) _offset = (offset); \ 141 if (likely(_idev != NULL)) \ 142 SNMP_INC_STATS_OFFSET_BH(_idev->stats.icmpv6, field, _offset); \ 143 SNMP_INC_STATS_OFFSET_BH(icmpv6_statistics, field, _offset); \ 144 }) 145 DECLARE_SNMP_STAT(struct udp_mib, udp_stats_in6); 146 #define UDP6_INC_STATS(field) SNMP_INC_STATS(udp_stats_in6, field) 147 #define UDP6_INC_STATS_BH(field) SNMP_INC_STATS_BH(udp_stats_in6, field) 148 #define UDP6_INC_STATS_USER(field) SNMP_INC_STATS_USER(udp_stats_in6, field) 149 150 int snmp6_register_dev(struct inet6_dev *idev); 151 int snmp6_unregister_dev(struct inet6_dev *idev); 152 int snmp6_alloc_dev(struct inet6_dev *idev); 153 int snmp6_free_dev(struct inet6_dev *idev); 154 int snmp6_mib_init(void *ptr[2], size_t mibsize, size_t mibalign); 155 void snmp6_mib_free(void *ptr[2]); 156 157 struct ip6_ra_chain 158 { 159 struct ip6_ra_chain *next; 160 struct sock *sk; 161 int sel; 162 void (*destructor)(struct sock *); 163 }; 164 165 extern struct ip6_ra_chain *ip6_ra_chain; 166 extern rwlock_t ip6_ra_lock; 167 168 /* 169 This structure is prepared by protocol, when parsing 170 ancillary data and passed to IPv6. 171 */ 172 173 struct ipv6_txoptions 174 { 175 /* Length of this structure */ 176 int tot_len; 177 178 /* length of extension headers */ 179 180 __u16 opt_flen; /* after fragment hdr */ 181 __u16 opt_nflen; /* before fragment hdr */ 182 183 struct ipv6_opt_hdr *hopopt; 184 struct ipv6_opt_hdr *dst0opt; 185 struct ipv6_rt_hdr *srcrt; /* Routing Header */ 186 struct ipv6_opt_hdr *dst1opt; 187 188 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */ 189 }; 190 191 struct ip6_flowlabel 192 { 193 struct ip6_flowlabel *next; 194 u32 label; 195 struct in6_addr dst; 196 struct ipv6_txoptions *opt; 197 atomic_t users; 198 unsigned long linger; 199 u8 share; 200 u32 owner; 201 unsigned long lastuse; 202 unsigned long expires; 203 }; 204 205 #define IPV6_FLOWINFO_MASK __constant_htonl(0x0FFFFFFF) 206 #define IPV6_FLOWLABEL_MASK __constant_htonl(0x000FFFFF) 207 208 struct ipv6_fl_socklist 209 { 210 struct ipv6_fl_socklist *next; 211 struct ip6_flowlabel *fl; 212 }; 213 214 extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, u32 label); 215 extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space, 216 struct ip6_flowlabel * fl, 217 struct ipv6_txoptions * fopt); 218 extern void fl6_free_socklist(struct sock *sk); 219 extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen); 220 extern void ip6_flowlabel_init(void); 221 extern void ip6_flowlabel_cleanup(void); 222 223 static inline void fl6_sock_release(struct ip6_flowlabel *fl) 224 { 225 if (fl) 226 atomic_dec(&fl->users); 227 } 228 229 extern int ip6_ra_control(struct sock *sk, int sel, 230 void (*destructor)(struct sock *)); 231 232 233 extern int ipv6_parse_hopopts(struct sk_buff *skb, int); 234 235 extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt); 236 extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt, 237 int newtype, 238 struct ipv6_opt_hdr __user *newopt, 239 int newoptlen); 240 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space, 241 struct ipv6_txoptions *opt); 242 243 extern int ip6_frag_nqueues; 244 extern atomic_t ip6_frag_mem; 245 246 #define IPV6_FRAG_TIMEOUT (60*HZ) /* 60 seconds */ 247 248 /* 249 * Function prototype for build_xmit 250 */ 251 252 typedef int (*inet_getfrag_t) (const void *data, 253 struct in6_addr *addr, 254 char *, 255 unsigned int, unsigned int); 256 257 extern int __ipv6_addr_type(const struct in6_addr *addr); 258 static inline int ipv6_addr_type(const struct in6_addr *addr) 259 { 260 return __ipv6_addr_type(addr) & 0xffff; 261 } 262 263 static inline int ipv6_addr_scope(const struct in6_addr *addr) 264 { 265 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK; 266 } 267 268 static inline int __ipv6_addr_src_scope(int type) 269 { 270 return (type == IPV6_ADDR_ANY ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16)); 271 } 272 273 static inline int ipv6_addr_src_scope(const struct in6_addr *addr) 274 { 275 return __ipv6_addr_src_scope(__ipv6_addr_type(addr)); 276 } 277 278 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2) 279 { 280 return memcmp((const void *) a1, (const void *) a2, sizeof(struct in6_addr)); 281 } 282 283 static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2) 284 { 285 memcpy((void *) a1, (const void *) a2, sizeof(struct in6_addr)); 286 } 287 288 static inline void ipv6_addr_prefix(struct in6_addr *pfx, 289 const struct in6_addr *addr, 290 int plen) 291 { 292 /* caller must guarantee 0 <= plen <= 128 */ 293 int o = plen >> 3, 294 b = plen & 0x7; 295 296 memcpy(pfx->s6_addr, addr, o); 297 if (b != 0) { 298 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b); 299 o++; 300 } 301 if (o < 16) 302 memset(pfx->s6_addr + o, 0, 16 - o); 303 } 304 305 #ifndef __HAVE_ARCH_ADDR_SET 306 static inline void ipv6_addr_set(struct in6_addr *addr, 307 __u32 w1, __u32 w2, 308 __u32 w3, __u32 w4) 309 { 310 addr->s6_addr32[0] = w1; 311 addr->s6_addr32[1] = w2; 312 addr->s6_addr32[2] = w3; 313 addr->s6_addr32[3] = w4; 314 } 315 #endif 316 317 static inline int ipv6_addr_equal(const struct in6_addr *a1, 318 const struct in6_addr *a2) 319 { 320 return (a1->s6_addr32[0] == a2->s6_addr32[0] && 321 a1->s6_addr32[1] == a2->s6_addr32[1] && 322 a1->s6_addr32[2] == a2->s6_addr32[2] && 323 a1->s6_addr32[3] == a2->s6_addr32[3]); 324 } 325 326 static inline int __ipv6_prefix_equal(const u32 *a1, const u32 *a2, 327 unsigned int prefixlen) 328 { 329 unsigned pdw, pbi; 330 331 /* check complete u32 in prefix */ 332 pdw = prefixlen >> 5; 333 if (pdw && memcmp(a1, a2, pdw << 2)) 334 return 0; 335 336 /* check incomplete u32 in prefix */ 337 pbi = prefixlen & 0x1f; 338 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi)))) 339 return 0; 340 341 return 1; 342 } 343 344 static inline int ipv6_prefix_equal(const struct in6_addr *a1, 345 const struct in6_addr *a2, 346 unsigned int prefixlen) 347 { 348 return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32, 349 prefixlen); 350 } 351 352 static inline int ipv6_addr_any(const struct in6_addr *a) 353 { 354 return ((a->s6_addr32[0] | a->s6_addr32[1] | 355 a->s6_addr32[2] | a->s6_addr32[3] ) == 0); 356 } 357 358 /* 359 * find the first different bit between two addresses 360 * length of address must be a multiple of 32bits 361 */ 362 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen) 363 { 364 const __u32 *a1 = token1, *a2 = token2; 365 int i; 366 367 addrlen >>= 2; 368 369 for (i = 0; i < addrlen; i++) { 370 __u32 xb = a1[i] ^ a2[i]; 371 if (xb) { 372 int j = 31; 373 374 xb = ntohl(xb); 375 while ((xb & (1 << j)) == 0) 376 j--; 377 378 return (i * 32 + 31 - j); 379 } 380 } 381 382 /* 383 * we should *never* get to this point since that 384 * would mean the addrs are equal 385 * 386 * However, we do get to it 8) And exacly, when 387 * addresses are equal 8) 388 * 389 * ip route add 1111::/128 via ... 390 * ip route add 1111::/64 via ... 391 * and we are here. 392 * 393 * Ideally, this function should stop comparison 394 * at prefix length. It does not, but it is still OK, 395 * if returned value is greater than prefix length. 396 * --ANK (980803) 397 */ 398 return (addrlen << 5); 399 } 400 401 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2) 402 { 403 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr)); 404 } 405 406 /* 407 * Prototypes exported by ipv6 408 */ 409 410 /* 411 * rcv function (called from netdevice level) 412 */ 413 414 extern int ipv6_rcv(struct sk_buff *skb, 415 struct net_device *dev, 416 struct packet_type *pt, 417 struct net_device *orig_dev); 418 419 /* 420 * upper-layer output functions 421 */ 422 extern int ip6_xmit(struct sock *sk, 423 struct sk_buff *skb, 424 struct flowi *fl, 425 struct ipv6_txoptions *opt, 426 int ipfragok); 427 428 extern int ip6_nd_hdr(struct sock *sk, 429 struct sk_buff *skb, 430 struct net_device *dev, 431 struct in6_addr *saddr, 432 struct in6_addr *daddr, 433 int proto, int len); 434 435 extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr); 436 437 extern int ip6_append_data(struct sock *sk, 438 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb), 439 void *from, 440 int length, 441 int transhdrlen, 442 int hlimit, 443 int tclass, 444 struct ipv6_txoptions *opt, 445 struct flowi *fl, 446 struct rt6_info *rt, 447 unsigned int flags); 448 449 extern int ip6_push_pending_frames(struct sock *sk); 450 451 extern void ip6_flush_pending_frames(struct sock *sk); 452 453 extern int ip6_dst_lookup(struct sock *sk, 454 struct dst_entry **dst, 455 struct flowi *fl); 456 457 /* 458 * skb processing functions 459 */ 460 461 extern int ip6_output(struct sk_buff *skb); 462 extern int ip6_forward(struct sk_buff *skb); 463 extern int ip6_input(struct sk_buff *skb); 464 extern int ip6_mc_input(struct sk_buff *skb); 465 466 /* 467 * Extension header (options) processing 468 */ 469 470 extern u8 * ipv6_build_nfrag_opts(struct sk_buff *skb, 471 u8 *prev_hdr, 472 struct ipv6_txoptions *opt, 473 struct in6_addr *daddr, 474 u32 jumbolen); 475 extern u8 * ipv6_build_frag_opts(struct sk_buff *skb, 476 u8 *prev_hdr, 477 struct ipv6_txoptions *opt); 478 extern void ipv6_push_nfrag_opts(struct sk_buff *skb, 479 struct ipv6_txoptions *opt, 480 u8 *proto, 481 struct in6_addr **daddr_p); 482 extern void ipv6_push_frag_opts(struct sk_buff *skb, 483 struct ipv6_txoptions *opt, 484 u8 *proto); 485 486 extern int ipv6_skip_exthdr(const struct sk_buff *, int start, 487 u8 *nexthdrp); 488 489 extern int ipv6_ext_hdr(u8 nexthdr); 490 491 extern struct ipv6_txoptions * ipv6_invert_rthdr(struct sock *sk, 492 struct ipv6_rt_hdr *hdr); 493 494 495 /* 496 * socket options (ipv6_sockglue.c) 497 */ 498 499 extern int ipv6_setsockopt(struct sock *sk, int level, 500 int optname, 501 char __user *optval, 502 int optlen); 503 extern int ipv6_getsockopt(struct sock *sk, int level, 504 int optname, 505 char __user *optval, 506 int __user *optlen); 507 508 extern void ipv6_packet_init(void); 509 510 extern void ipv6_packet_cleanup(void); 511 512 extern int ip6_datagram_connect(struct sock *sk, 513 struct sockaddr *addr, int addr_len); 514 515 extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len); 516 extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, u16 port, 517 u32 info, u8 *payload); 518 extern void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info); 519 520 extern int inet6_release(struct socket *sock); 521 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr, 522 int addr_len); 523 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 524 int *uaddr_len, int peer); 525 extern int inet6_ioctl(struct socket *sock, unsigned int cmd, 526 unsigned long arg); 527 528 /* 529 * reassembly.c 530 */ 531 extern int sysctl_ip6frag_high_thresh; 532 extern int sysctl_ip6frag_low_thresh; 533 extern int sysctl_ip6frag_time; 534 extern int sysctl_ip6frag_secret_interval; 535 536 extern struct proto_ops inet6_stream_ops; 537 extern struct proto_ops inet6_dgram_ops; 538 539 extern int ip6_mc_source(int add, int omode, struct sock *sk, 540 struct group_source_req *pgsr); 541 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf); 542 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 543 struct group_filter __user *optval, 544 int __user *optlen); 545 546 #ifdef CONFIG_PROC_FS 547 extern int ac6_proc_init(void); 548 extern void ac6_proc_exit(void); 549 extern int raw6_proc_init(void); 550 extern void raw6_proc_exit(void); 551 extern int tcp6_proc_init(void); 552 extern void tcp6_proc_exit(void); 553 extern int udp6_proc_init(void); 554 extern void udp6_proc_exit(void); 555 extern int ipv6_misc_proc_init(void); 556 extern void ipv6_misc_proc_exit(void); 557 558 extern struct rt6_statistics rt6_stats; 559 #endif 560 561 #ifdef CONFIG_SYSCTL 562 extern ctl_table ipv6_route_table[]; 563 extern ctl_table ipv6_icmp_table[]; 564 565 extern void ipv6_sysctl_register(void); 566 extern void ipv6_sysctl_unregister(void); 567 #endif 568 569 #endif /* __KERNEL__ */ 570 #endif /* _NET_IPV6_H */ 571