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); 240 241 extern int ip6_frag_nqueues; 242 extern atomic_t ip6_frag_mem; 243 244 #define IPV6_FRAG_TIMEOUT (60*HZ) /* 60 seconds */ 245 246 /* 247 * Function prototype for build_xmit 248 */ 249 250 typedef int (*inet_getfrag_t) (const void *data, 251 struct in6_addr *addr, 252 char *, 253 unsigned int, unsigned int); 254 255 extern int __ipv6_addr_type(const struct in6_addr *addr); 256 static inline int ipv6_addr_type(const struct in6_addr *addr) 257 { 258 return __ipv6_addr_type(addr) & 0xffff; 259 } 260 261 static inline int ipv6_addr_scope(const struct in6_addr *addr) 262 { 263 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK; 264 } 265 266 static inline int __ipv6_addr_src_scope(int type) 267 { 268 return (type == IPV6_ADDR_ANY ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16)); 269 } 270 271 static inline int ipv6_addr_src_scope(const struct in6_addr *addr) 272 { 273 return __ipv6_addr_src_scope(__ipv6_addr_type(addr)); 274 } 275 276 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2) 277 { 278 return memcmp((const void *) a1, (const void *) a2, sizeof(struct in6_addr)); 279 } 280 281 static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2) 282 { 283 memcpy((void *) a1, (const void *) a2, sizeof(struct in6_addr)); 284 } 285 286 static inline void ipv6_addr_prefix(struct in6_addr *pfx, 287 const struct in6_addr *addr, 288 int plen) 289 { 290 /* caller must guarantee 0 <= plen <= 128 */ 291 int o = plen >> 3, 292 b = plen & 0x7; 293 294 memcpy(pfx->s6_addr, addr, o); 295 if (b != 0) { 296 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b); 297 o++; 298 } 299 if (o < 16) 300 memset(pfx->s6_addr + o, 0, 16 - o); 301 } 302 303 #ifndef __HAVE_ARCH_ADDR_SET 304 static inline void ipv6_addr_set(struct in6_addr *addr, 305 __u32 w1, __u32 w2, 306 __u32 w3, __u32 w4) 307 { 308 addr->s6_addr32[0] = w1; 309 addr->s6_addr32[1] = w2; 310 addr->s6_addr32[2] = w3; 311 addr->s6_addr32[3] = w4; 312 } 313 #endif 314 315 static inline int ipv6_addr_equal(const struct in6_addr *a1, 316 const struct in6_addr *a2) 317 { 318 return (a1->s6_addr32[0] == a2->s6_addr32[0] && 319 a1->s6_addr32[1] == a2->s6_addr32[1] && 320 a1->s6_addr32[2] == a2->s6_addr32[2] && 321 a1->s6_addr32[3] == a2->s6_addr32[3]); 322 } 323 324 static inline int __ipv6_prefix_equal(const u32 *a1, const u32 *a2, 325 unsigned int prefixlen) 326 { 327 unsigned pdw, pbi; 328 329 /* check complete u32 in prefix */ 330 pdw = prefixlen >> 5; 331 if (pdw && memcmp(a1, a2, pdw << 2)) 332 return 0; 333 334 /* check incomplete u32 in prefix */ 335 pbi = prefixlen & 0x1f; 336 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi)))) 337 return 0; 338 339 return 1; 340 } 341 342 static inline int ipv6_prefix_equal(const struct in6_addr *a1, 343 const struct in6_addr *a2, 344 unsigned int prefixlen) 345 { 346 return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32, 347 prefixlen); 348 } 349 350 static inline int ipv6_addr_any(const struct in6_addr *a) 351 { 352 return ((a->s6_addr32[0] | a->s6_addr32[1] | 353 a->s6_addr32[2] | a->s6_addr32[3] ) == 0); 354 } 355 356 /* 357 * find the first different bit between two addresses 358 * length of address must be a multiple of 32bits 359 */ 360 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen) 361 { 362 const __u32 *a1 = token1, *a2 = token2; 363 int i; 364 365 addrlen >>= 2; 366 367 for (i = 0; i < addrlen; i++) { 368 __u32 xb = a1[i] ^ a2[i]; 369 if (xb) { 370 int j = 31; 371 372 xb = ntohl(xb); 373 while ((xb & (1 << j)) == 0) 374 j--; 375 376 return (i * 32 + 31 - j); 377 } 378 } 379 380 /* 381 * we should *never* get to this point since that 382 * would mean the addrs are equal 383 * 384 * However, we do get to it 8) And exacly, when 385 * addresses are equal 8) 386 * 387 * ip route add 1111::/128 via ... 388 * ip route add 1111::/64 via ... 389 * and we are here. 390 * 391 * Ideally, this function should stop comparison 392 * at prefix length. It does not, but it is still OK, 393 * if returned value is greater than prefix length. 394 * --ANK (980803) 395 */ 396 return (addrlen << 5); 397 } 398 399 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2) 400 { 401 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr)); 402 } 403 404 /* 405 * Prototypes exported by ipv6 406 */ 407 408 /* 409 * rcv function (called from netdevice level) 410 */ 411 412 extern int ipv6_rcv(struct sk_buff *skb, 413 struct net_device *dev, 414 struct packet_type *pt, 415 struct net_device *orig_dev); 416 417 /* 418 * upper-layer output functions 419 */ 420 extern int ip6_xmit(struct sock *sk, 421 struct sk_buff *skb, 422 struct flowi *fl, 423 struct ipv6_txoptions *opt, 424 int ipfragok); 425 426 extern int ip6_nd_hdr(struct sock *sk, 427 struct sk_buff *skb, 428 struct net_device *dev, 429 struct in6_addr *saddr, 430 struct in6_addr *daddr, 431 int proto, int len); 432 433 extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr); 434 435 extern int ip6_append_data(struct sock *sk, 436 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb), 437 void *from, 438 int length, 439 int transhdrlen, 440 int hlimit, 441 int tclass, 442 struct ipv6_txoptions *opt, 443 struct flowi *fl, 444 struct rt6_info *rt, 445 unsigned int flags); 446 447 extern int ip6_push_pending_frames(struct sock *sk); 448 449 extern void ip6_flush_pending_frames(struct sock *sk); 450 451 extern int ip6_dst_lookup(struct sock *sk, 452 struct dst_entry **dst, 453 struct flowi *fl); 454 455 /* 456 * skb processing functions 457 */ 458 459 extern int ip6_output(struct sk_buff *skb); 460 extern int ip6_forward(struct sk_buff *skb); 461 extern int ip6_input(struct sk_buff *skb); 462 extern int ip6_mc_input(struct sk_buff *skb); 463 464 /* 465 * Extension header (options) processing 466 */ 467 468 extern u8 * ipv6_build_nfrag_opts(struct sk_buff *skb, 469 u8 *prev_hdr, 470 struct ipv6_txoptions *opt, 471 struct in6_addr *daddr, 472 u32 jumbolen); 473 extern u8 * ipv6_build_frag_opts(struct sk_buff *skb, 474 u8 *prev_hdr, 475 struct ipv6_txoptions *opt); 476 extern void ipv6_push_nfrag_opts(struct sk_buff *skb, 477 struct ipv6_txoptions *opt, 478 u8 *proto, 479 struct in6_addr **daddr_p); 480 extern void ipv6_push_frag_opts(struct sk_buff *skb, 481 struct ipv6_txoptions *opt, 482 u8 *proto); 483 484 extern int ipv6_skip_exthdr(const struct sk_buff *, int start, 485 u8 *nexthdrp); 486 487 extern int ipv6_ext_hdr(u8 nexthdr); 488 489 extern struct ipv6_txoptions * ipv6_invert_rthdr(struct sock *sk, 490 struct ipv6_rt_hdr *hdr); 491 492 493 /* 494 * socket options (ipv6_sockglue.c) 495 */ 496 497 extern int ipv6_setsockopt(struct sock *sk, int level, 498 int optname, 499 char __user *optval, 500 int optlen); 501 extern int ipv6_getsockopt(struct sock *sk, int level, 502 int optname, 503 char __user *optval, 504 int __user *optlen); 505 506 extern void ipv6_packet_init(void); 507 508 extern void ipv6_packet_cleanup(void); 509 510 extern int ip6_datagram_connect(struct sock *sk, 511 struct sockaddr *addr, int addr_len); 512 513 extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len); 514 extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, u16 port, 515 u32 info, u8 *payload); 516 extern void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info); 517 518 extern int inet6_release(struct socket *sock); 519 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr, 520 int addr_len); 521 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 522 int *uaddr_len, int peer); 523 extern int inet6_ioctl(struct socket *sock, unsigned int cmd, 524 unsigned long arg); 525 526 /* 527 * reassembly.c 528 */ 529 extern int sysctl_ip6frag_high_thresh; 530 extern int sysctl_ip6frag_low_thresh; 531 extern int sysctl_ip6frag_time; 532 extern int sysctl_ip6frag_secret_interval; 533 534 extern struct proto_ops inet6_stream_ops; 535 extern struct proto_ops inet6_dgram_ops; 536 537 extern int ip6_mc_source(int add, int omode, struct sock *sk, 538 struct group_source_req *pgsr); 539 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf); 540 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 541 struct group_filter __user *optval, 542 int __user *optlen); 543 544 #ifdef CONFIG_PROC_FS 545 extern int ac6_proc_init(void); 546 extern void ac6_proc_exit(void); 547 extern int raw6_proc_init(void); 548 extern void raw6_proc_exit(void); 549 extern int tcp6_proc_init(void); 550 extern void tcp6_proc_exit(void); 551 extern int udp6_proc_init(void); 552 extern void udp6_proc_exit(void); 553 extern int ipv6_misc_proc_init(void); 554 extern void ipv6_misc_proc_exit(void); 555 556 extern struct rt6_statistics rt6_stats; 557 #endif 558 559 #ifdef CONFIG_SYSCTL 560 extern ctl_table ipv6_route_table[]; 561 extern ctl_table ipv6_icmp_table[]; 562 563 extern void ipv6_sysctl_register(void); 564 extern void ipv6_sysctl_unregister(void); 565 #endif 566 567 #endif /* __KERNEL__ */ 568 #endif /* _NET_IPV6_H */ 569