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 <net/sock.h> 108 109 /* sysctls */ 110 extern int sysctl_ipv6_bindv6only; 111 extern int sysctl_mld_max_msf; 112 113 /* MIBs */ 114 DECLARE_SNMP_STAT(struct ipstats_mib, ipv6_statistics); 115 #define IP6_INC_STATS(field) SNMP_INC_STATS(ipv6_statistics, field) 116 #define IP6_INC_STATS_BH(field) SNMP_INC_STATS_BH(ipv6_statistics, field) 117 #define IP6_INC_STATS_USER(field) SNMP_INC_STATS_USER(ipv6_statistics, field) 118 DECLARE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics); 119 #define ICMP6_INC_STATS(idev, field) ({ \ 120 struct inet6_dev *_idev = (idev); \ 121 if (likely(_idev != NULL)) \ 122 SNMP_INC_STATS(idev->stats.icmpv6, field); \ 123 SNMP_INC_STATS(icmpv6_statistics, field); \ 124 }) 125 #define ICMP6_INC_STATS_BH(idev, field) ({ \ 126 struct inet6_dev *_idev = (idev); \ 127 if (likely(_idev != NULL)) \ 128 SNMP_INC_STATS_BH((_idev)->stats.icmpv6, field); \ 129 SNMP_INC_STATS_BH(icmpv6_statistics, field); \ 130 }) 131 #define ICMP6_INC_STATS_USER(idev, field) ({ \ 132 struct inet6_dev *_idev = (idev); \ 133 if (likely(_idev != NULL)) \ 134 SNMP_INC_STATS_USER(_idev->stats.icmpv6, field); \ 135 SNMP_INC_STATS_USER(icmpv6_statistics, 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 DECLARE_SNMP_STAT(struct udp_mib, udp_stats_in6); 145 #define UDP6_INC_STATS(field) SNMP_INC_STATS(udp_stats_in6, field) 146 #define UDP6_INC_STATS_BH(field) SNMP_INC_STATS_BH(udp_stats_in6, field) 147 #define UDP6_INC_STATS_USER(field) SNMP_INC_STATS_USER(udp_stats_in6, field) 148 extern atomic_t inet6_sock_nr; 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 *auth; 187 struct ipv6_opt_hdr *dst1opt; 188 189 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */ 190 }; 191 192 struct ip6_flowlabel 193 { 194 struct ip6_flowlabel *next; 195 u32 label; 196 struct in6_addr dst; 197 struct ipv6_txoptions *opt; 198 atomic_t users; 199 unsigned long linger; 200 u8 share; 201 u32 owner; 202 unsigned long lastuse; 203 unsigned long expires; 204 }; 205 206 #define IPV6_FLOWINFO_MASK __constant_htonl(0x0FFFFFFF) 207 #define IPV6_FLOWLABEL_MASK __constant_htonl(0x000FFFFF) 208 209 struct ipv6_fl_socklist 210 { 211 struct ipv6_fl_socklist *next; 212 struct ip6_flowlabel *fl; 213 }; 214 215 extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, u32 label); 216 extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space, 217 struct ip6_flowlabel * fl, 218 struct ipv6_txoptions * fopt); 219 extern void fl6_free_socklist(struct sock *sk); 220 extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen); 221 extern void ip6_flowlabel_init(void); 222 extern void ip6_flowlabel_cleanup(void); 223 224 static inline void fl6_sock_release(struct ip6_flowlabel *fl) 225 { 226 if (fl) 227 atomic_dec(&fl->users); 228 } 229 230 extern int ip6_ra_control(struct sock *sk, int sel, 231 void (*destructor)(struct sock *)); 232 233 234 extern int ipv6_parse_hopopts(struct sk_buff *skb, int); 235 236 extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt); 237 238 extern int ip6_frag_nqueues; 239 extern atomic_t ip6_frag_mem; 240 241 #define IPV6_FRAG_TIMEOUT (60*HZ) /* 60 seconds */ 242 243 /* 244 * Function prototype for build_xmit 245 */ 246 247 typedef int (*inet_getfrag_t) (const void *data, 248 struct in6_addr *addr, 249 char *, 250 unsigned int, unsigned int); 251 252 253 extern int ipv6_addr_type(const struct in6_addr *addr); 254 255 static inline int ipv6_addr_scope(const struct in6_addr *addr) 256 { 257 return ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK; 258 } 259 260 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2) 261 { 262 return memcmp((const void *) a1, (const void *) a2, sizeof(struct in6_addr)); 263 } 264 265 static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2) 266 { 267 memcpy((void *) a1, (const void *) a2, sizeof(struct in6_addr)); 268 } 269 270 static inline void ipv6_addr_prefix(struct in6_addr *pfx, 271 const struct in6_addr *addr, 272 int plen) 273 { 274 /* caller must guarantee 0 <= plen <= 128 */ 275 int o = plen >> 3, 276 b = plen & 0x7; 277 278 memcpy(pfx->s6_addr, addr, o); 279 if (b != 0) { 280 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b); 281 o++; 282 } 283 if (o < 16) 284 memset(pfx->s6_addr + o, 0, 16 - o); 285 } 286 287 #ifndef __HAVE_ARCH_ADDR_SET 288 static inline void ipv6_addr_set(struct in6_addr *addr, 289 __u32 w1, __u32 w2, 290 __u32 w3, __u32 w4) 291 { 292 addr->s6_addr32[0] = w1; 293 addr->s6_addr32[1] = w2; 294 addr->s6_addr32[2] = w3; 295 addr->s6_addr32[3] = w4; 296 } 297 #endif 298 299 static inline int ipv6_addr_equal(const struct in6_addr *a1, 300 const struct in6_addr *a2) 301 { 302 return (a1->s6_addr32[0] == a2->s6_addr32[0] && 303 a1->s6_addr32[1] == a2->s6_addr32[1] && 304 a1->s6_addr32[2] == a2->s6_addr32[2] && 305 a1->s6_addr32[3] == a2->s6_addr32[3]); 306 } 307 308 static inline int __ipv6_prefix_equal(const u32 *a1, const u32 *a2, 309 unsigned int prefixlen) 310 { 311 unsigned pdw, pbi; 312 313 /* check complete u32 in prefix */ 314 pdw = prefixlen >> 5; 315 if (pdw && memcmp(a1, a2, pdw << 2)) 316 return 0; 317 318 /* check incomplete u32 in prefix */ 319 pbi = prefixlen & 0x1f; 320 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi)))) 321 return 0; 322 323 return 1; 324 } 325 326 static inline int ipv6_prefix_equal(const struct in6_addr *a1, 327 const struct in6_addr *a2, 328 unsigned int prefixlen) 329 { 330 return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32, 331 prefixlen); 332 } 333 334 static inline int ipv6_addr_any(const struct in6_addr *a) 335 { 336 return ((a->s6_addr32[0] | a->s6_addr32[1] | 337 a->s6_addr32[2] | a->s6_addr32[3] ) == 0); 338 } 339 340 /* 341 * Prototypes exported by ipv6 342 */ 343 344 /* 345 * rcv function (called from netdevice level) 346 */ 347 348 extern int ipv6_rcv(struct sk_buff *skb, 349 struct net_device *dev, 350 struct packet_type *pt); 351 352 /* 353 * upper-layer output functions 354 */ 355 extern int ip6_xmit(struct sock *sk, 356 struct sk_buff *skb, 357 struct flowi *fl, 358 struct ipv6_txoptions *opt, 359 int ipfragok); 360 361 extern int ip6_nd_hdr(struct sock *sk, 362 struct sk_buff *skb, 363 struct net_device *dev, 364 struct in6_addr *saddr, 365 struct in6_addr *daddr, 366 int proto, int len); 367 368 extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr); 369 370 extern int ip6_append_data(struct sock *sk, 371 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb), 372 void *from, 373 int length, 374 int transhdrlen, 375 int hlimit, 376 struct ipv6_txoptions *opt, 377 struct flowi *fl, 378 struct rt6_info *rt, 379 unsigned int flags); 380 381 extern int ip6_push_pending_frames(struct sock *sk); 382 383 extern void ip6_flush_pending_frames(struct sock *sk); 384 385 extern int ip6_dst_lookup(struct sock *sk, 386 struct dst_entry **dst, 387 struct flowi *fl); 388 389 /* 390 * skb processing functions 391 */ 392 393 extern int ip6_output(struct sk_buff *skb); 394 extern int ip6_forward(struct sk_buff *skb); 395 extern int ip6_input(struct sk_buff *skb); 396 extern int ip6_mc_input(struct sk_buff *skb); 397 398 /* 399 * Extension header (options) processing 400 */ 401 402 extern u8 * ipv6_build_nfrag_opts(struct sk_buff *skb, 403 u8 *prev_hdr, 404 struct ipv6_txoptions *opt, 405 struct in6_addr *daddr, 406 u32 jumbolen); 407 extern u8 * ipv6_build_frag_opts(struct sk_buff *skb, 408 u8 *prev_hdr, 409 struct ipv6_txoptions *opt); 410 extern void ipv6_push_nfrag_opts(struct sk_buff *skb, 411 struct ipv6_txoptions *opt, 412 u8 *proto, 413 struct in6_addr **daddr_p); 414 extern void ipv6_push_frag_opts(struct sk_buff *skb, 415 struct ipv6_txoptions *opt, 416 u8 *proto); 417 418 extern int ipv6_skip_exthdr(const struct sk_buff *, int start, 419 u8 *nexthdrp, int len); 420 421 extern int ipv6_ext_hdr(u8 nexthdr); 422 423 extern struct ipv6_txoptions * ipv6_invert_rthdr(struct sock *sk, 424 struct ipv6_rt_hdr *hdr); 425 426 427 /* 428 * socket options (ipv6_sockglue.c) 429 */ 430 431 extern int ipv6_setsockopt(struct sock *sk, int level, 432 int optname, 433 char __user *optval, 434 int optlen); 435 extern int ipv6_getsockopt(struct sock *sk, int level, 436 int optname, 437 char __user *optval, 438 int __user *optlen); 439 440 extern void ipv6_packet_init(void); 441 442 extern void ipv6_packet_cleanup(void); 443 444 extern int ip6_datagram_connect(struct sock *sk, 445 struct sockaddr *addr, int addr_len); 446 447 extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len); 448 extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, u16 port, 449 u32 info, u8 *payload); 450 extern void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info); 451 452 extern int inet6_release(struct socket *sock); 453 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr, 454 int addr_len); 455 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 456 int *uaddr_len, int peer); 457 extern int inet6_ioctl(struct socket *sock, unsigned int cmd, 458 unsigned long arg); 459 460 /* 461 * reassembly.c 462 */ 463 extern int sysctl_ip6frag_high_thresh; 464 extern int sysctl_ip6frag_low_thresh; 465 extern int sysctl_ip6frag_time; 466 extern int sysctl_ip6frag_secret_interval; 467 468 #endif /* __KERNEL__ */ 469 #endif /* _NET_IPV6_H */ 470 471 472 473