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); 254 255 256 extern int ipv6_addr_type(const struct in6_addr *addr); 257 258 static inline int ipv6_addr_scope(const struct in6_addr *addr) 259 { 260 return ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK; 261 } 262 263 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2) 264 { 265 return memcmp((const void *) a1, (const void *) a2, sizeof(struct in6_addr)); 266 } 267 268 static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2) 269 { 270 memcpy((void *) a1, (const void *) a2, sizeof(struct in6_addr)); 271 } 272 273 static inline void ipv6_addr_prefix(struct in6_addr *pfx, 274 const struct in6_addr *addr, 275 int plen) 276 { 277 /* caller must guarantee 0 <= plen <= 128 */ 278 int o = plen >> 3, 279 b = plen & 0x7; 280 281 memcpy(pfx->s6_addr, addr, o); 282 if (b != 0) { 283 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b); 284 o++; 285 } 286 if (o < 16) 287 memset(pfx->s6_addr + o, 0, 16 - o); 288 } 289 290 #ifndef __HAVE_ARCH_ADDR_SET 291 static inline void ipv6_addr_set(struct in6_addr *addr, 292 __u32 w1, __u32 w2, 293 __u32 w3, __u32 w4) 294 { 295 addr->s6_addr32[0] = w1; 296 addr->s6_addr32[1] = w2; 297 addr->s6_addr32[2] = w3; 298 addr->s6_addr32[3] = w4; 299 } 300 #endif 301 302 static inline int ipv6_addr_equal(const struct in6_addr *a1, 303 const struct in6_addr *a2) 304 { 305 return (a1->s6_addr32[0] == a2->s6_addr32[0] && 306 a1->s6_addr32[1] == a2->s6_addr32[1] && 307 a1->s6_addr32[2] == a2->s6_addr32[2] && 308 a1->s6_addr32[3] == a2->s6_addr32[3]); 309 } 310 311 static inline int __ipv6_prefix_equal(const u32 *a1, const u32 *a2, 312 unsigned int prefixlen) 313 { 314 unsigned pdw, pbi; 315 316 /* check complete u32 in prefix */ 317 pdw = prefixlen >> 5; 318 if (pdw && memcmp(a1, a2, pdw << 2)) 319 return 0; 320 321 /* check incomplete u32 in prefix */ 322 pbi = prefixlen & 0x1f; 323 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi)))) 324 return 0; 325 326 return 1; 327 } 328 329 static inline int ipv6_prefix_equal(const struct in6_addr *a1, 330 const struct in6_addr *a2, 331 unsigned int prefixlen) 332 { 333 return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32, 334 prefixlen); 335 } 336 337 static inline int ipv6_addr_any(const struct in6_addr *a) 338 { 339 return ((a->s6_addr32[0] | a->s6_addr32[1] | 340 a->s6_addr32[2] | a->s6_addr32[3] ) == 0); 341 } 342 343 /* 344 * Prototypes exported by ipv6 345 */ 346 347 /* 348 * rcv function (called from netdevice level) 349 */ 350 351 extern int ipv6_rcv(struct sk_buff *skb, 352 struct net_device *dev, 353 struct packet_type *pt, 354 struct net_device *orig_dev); 355 356 /* 357 * upper-layer output functions 358 */ 359 extern int ip6_xmit(struct sock *sk, 360 struct sk_buff *skb, 361 struct flowi *fl, 362 struct ipv6_txoptions *opt, 363 int ipfragok); 364 365 extern int ip6_nd_hdr(struct sock *sk, 366 struct sk_buff *skb, 367 struct net_device *dev, 368 struct in6_addr *saddr, 369 struct in6_addr *daddr, 370 int proto, int len); 371 372 extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr); 373 374 extern int ip6_append_data(struct sock *sk, 375 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb), 376 void *from, 377 int length, 378 int transhdrlen, 379 int hlimit, 380 int tclass, 381 struct ipv6_txoptions *opt, 382 struct flowi *fl, 383 struct rt6_info *rt, 384 unsigned int flags); 385 386 extern int ip6_push_pending_frames(struct sock *sk); 387 388 extern void ip6_flush_pending_frames(struct sock *sk); 389 390 extern int ip6_dst_lookup(struct sock *sk, 391 struct dst_entry **dst, 392 struct flowi *fl); 393 394 /* 395 * skb processing functions 396 */ 397 398 extern int ip6_output(struct sk_buff *skb); 399 extern int ip6_forward(struct sk_buff *skb); 400 extern int ip6_input(struct sk_buff *skb); 401 extern int ip6_mc_input(struct sk_buff *skb); 402 403 /* 404 * Extension header (options) processing 405 */ 406 407 extern u8 * ipv6_build_nfrag_opts(struct sk_buff *skb, 408 u8 *prev_hdr, 409 struct ipv6_txoptions *opt, 410 struct in6_addr *daddr, 411 u32 jumbolen); 412 extern u8 * ipv6_build_frag_opts(struct sk_buff *skb, 413 u8 *prev_hdr, 414 struct ipv6_txoptions *opt); 415 extern void ipv6_push_nfrag_opts(struct sk_buff *skb, 416 struct ipv6_txoptions *opt, 417 u8 *proto, 418 struct in6_addr **daddr_p); 419 extern void ipv6_push_frag_opts(struct sk_buff *skb, 420 struct ipv6_txoptions *opt, 421 u8 *proto); 422 423 extern int ipv6_skip_exthdr(const struct sk_buff *, int start, 424 u8 *nexthdrp); 425 426 extern int ipv6_ext_hdr(u8 nexthdr); 427 428 extern struct ipv6_txoptions * ipv6_invert_rthdr(struct sock *sk, 429 struct ipv6_rt_hdr *hdr); 430 431 432 /* 433 * socket options (ipv6_sockglue.c) 434 */ 435 436 extern int ipv6_setsockopt(struct sock *sk, int level, 437 int optname, 438 char __user *optval, 439 int optlen); 440 extern int ipv6_getsockopt(struct sock *sk, int level, 441 int optname, 442 char __user *optval, 443 int __user *optlen); 444 445 extern void ipv6_packet_init(void); 446 447 extern void ipv6_packet_cleanup(void); 448 449 extern int ip6_datagram_connect(struct sock *sk, 450 struct sockaddr *addr, int addr_len); 451 452 extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len); 453 extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, u16 port, 454 u32 info, u8 *payload); 455 extern void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info); 456 457 extern int inet6_release(struct socket *sock); 458 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr, 459 int addr_len); 460 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 461 int *uaddr_len, int peer); 462 extern int inet6_ioctl(struct socket *sock, unsigned int cmd, 463 unsigned long arg); 464 465 /* 466 * reassembly.c 467 */ 468 extern int sysctl_ip6frag_high_thresh; 469 extern int sysctl_ip6frag_low_thresh; 470 extern int sysctl_ip6frag_time; 471 extern int sysctl_ip6frag_secret_interval; 472 473 extern struct proto_ops inet6_stream_ops; 474 extern struct proto_ops inet6_dgram_ops; 475 476 extern int ip6_mc_source(int add, int omode, struct sock *sk, 477 struct group_source_req *pgsr); 478 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf); 479 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 480 struct group_filter __user *optval, 481 int __user *optlen); 482 483 #ifdef CONFIG_PROC_FS 484 extern int ac6_proc_init(void); 485 extern void ac6_proc_exit(void); 486 extern int raw6_proc_init(void); 487 extern void raw6_proc_exit(void); 488 extern int tcp6_proc_init(void); 489 extern void tcp6_proc_exit(void); 490 extern int udp6_proc_init(void); 491 extern void udp6_proc_exit(void); 492 extern int ipv6_misc_proc_init(void); 493 extern void ipv6_misc_proc_exit(void); 494 495 extern struct rt6_statistics rt6_stats; 496 #endif 497 498 #ifdef CONFIG_SYSCTL 499 extern ctl_table ipv6_route_table[]; 500 extern ctl_table ipv6_icmp_table[]; 501 502 extern void ipv6_sysctl_register(void); 503 extern void ipv6_sysctl_unregister(void); 504 #endif 505 506 #endif /* __KERNEL__ */ 507 #endif /* _NET_IPV6_H */ 508