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 *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); 236 237 extern int ip6_frag_nqueues; 238 extern atomic_t ip6_frag_mem; 239 240 #define IPV6_FRAG_TIMEOUT (60*HZ) /* 60 seconds */ 241 242 /* 243 * Function prototype for build_xmit 244 */ 245 246 typedef int (*inet_getfrag_t) (const void *data, 247 struct in6_addr *addr, 248 char *, 249 unsigned int, unsigned int); 250 251 252 extern int ipv6_addr_type(const struct in6_addr *addr); 253 254 static inline int ipv6_addr_scope(const struct in6_addr *addr) 255 { 256 return ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK; 257 } 258 259 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2) 260 { 261 return memcmp((const void *) a1, (const void *) a2, sizeof(struct in6_addr)); 262 } 263 264 static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2) 265 { 266 memcpy((void *) a1, (const void *) a2, sizeof(struct in6_addr)); 267 } 268 269 static inline void ipv6_addr_prefix(struct in6_addr *pfx, 270 const struct in6_addr *addr, 271 int plen) 272 { 273 /* caller must guarantee 0 <= plen <= 128 */ 274 int o = plen >> 3, 275 b = plen & 0x7; 276 277 memcpy(pfx->s6_addr, addr, o); 278 if (b != 0) { 279 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b); 280 o++; 281 } 282 if (o < 16) 283 memset(pfx->s6_addr + o, 0, 16 - o); 284 } 285 286 #ifndef __HAVE_ARCH_ADDR_SET 287 static inline void ipv6_addr_set(struct in6_addr *addr, 288 __u32 w1, __u32 w2, 289 __u32 w3, __u32 w4) 290 { 291 addr->s6_addr32[0] = w1; 292 addr->s6_addr32[1] = w2; 293 addr->s6_addr32[2] = w3; 294 addr->s6_addr32[3] = w4; 295 } 296 #endif 297 298 static inline int ipv6_addr_equal(const struct in6_addr *a1, 299 const struct in6_addr *a2) 300 { 301 return (a1->s6_addr32[0] == a2->s6_addr32[0] && 302 a1->s6_addr32[1] == a2->s6_addr32[1] && 303 a1->s6_addr32[2] == a2->s6_addr32[2] && 304 a1->s6_addr32[3] == a2->s6_addr32[3]); 305 } 306 307 static inline int __ipv6_prefix_equal(const u32 *a1, const u32 *a2, 308 unsigned int prefixlen) 309 { 310 unsigned pdw, pbi; 311 312 /* check complete u32 in prefix */ 313 pdw = prefixlen >> 5; 314 if (pdw && memcmp(a1, a2, pdw << 2)) 315 return 0; 316 317 /* check incomplete u32 in prefix */ 318 pbi = prefixlen & 0x1f; 319 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi)))) 320 return 0; 321 322 return 1; 323 } 324 325 static inline int ipv6_prefix_equal(const struct in6_addr *a1, 326 const struct in6_addr *a2, 327 unsigned int prefixlen) 328 { 329 return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32, 330 prefixlen); 331 } 332 333 static inline int ipv6_addr_any(const struct in6_addr *a) 334 { 335 return ((a->s6_addr32[0] | a->s6_addr32[1] | 336 a->s6_addr32[2] | a->s6_addr32[3] ) == 0); 337 } 338 339 /* 340 * Prototypes exported by ipv6 341 */ 342 343 /* 344 * rcv function (called from netdevice level) 345 */ 346 347 extern int ipv6_rcv(struct sk_buff *skb, 348 struct net_device *dev, 349 struct packet_type *pt); 350 351 /* 352 * upper-layer output functions 353 */ 354 extern int ip6_xmit(struct sock *sk, 355 struct sk_buff *skb, 356 struct flowi *fl, 357 struct ipv6_txoptions *opt, 358 int ipfragok); 359 360 extern int ip6_nd_hdr(struct sock *sk, 361 struct sk_buff *skb, 362 struct net_device *dev, 363 struct in6_addr *saddr, 364 struct in6_addr *daddr, 365 int proto, int len); 366 367 extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr); 368 369 extern int ip6_append_data(struct sock *sk, 370 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb), 371 void *from, 372 int length, 373 int transhdrlen, 374 int hlimit, 375 struct ipv6_txoptions *opt, 376 struct flowi *fl, 377 struct rt6_info *rt, 378 unsigned int flags); 379 380 extern int ip6_push_pending_frames(struct sock *sk); 381 382 extern void ip6_flush_pending_frames(struct sock *sk); 383 384 extern int ip6_dst_lookup(struct sock *sk, 385 struct dst_entry **dst, 386 struct flowi *fl); 387 388 /* 389 * skb processing functions 390 */ 391 392 extern int ip6_output(struct sk_buff *skb); 393 extern int ip6_forward(struct sk_buff *skb); 394 extern int ip6_input(struct sk_buff *skb); 395 extern int ip6_mc_input(struct sk_buff *skb); 396 397 /* 398 * Extension header (options) processing 399 */ 400 401 extern u8 * ipv6_build_nfrag_opts(struct sk_buff *skb, 402 u8 *prev_hdr, 403 struct ipv6_txoptions *opt, 404 struct in6_addr *daddr, 405 u32 jumbolen); 406 extern u8 * ipv6_build_frag_opts(struct sk_buff *skb, 407 u8 *prev_hdr, 408 struct ipv6_txoptions *opt); 409 extern void ipv6_push_nfrag_opts(struct sk_buff *skb, 410 struct ipv6_txoptions *opt, 411 u8 *proto, 412 struct in6_addr **daddr_p); 413 extern void ipv6_push_frag_opts(struct sk_buff *skb, 414 struct ipv6_txoptions *opt, 415 u8 *proto); 416 417 extern int ipv6_skip_exthdr(const struct sk_buff *, int start, 418 u8 *nexthdrp); 419 420 extern int ipv6_ext_hdr(u8 nexthdr); 421 422 extern struct ipv6_txoptions * ipv6_invert_rthdr(struct sock *sk, 423 struct ipv6_rt_hdr *hdr); 424 425 426 /* 427 * socket options (ipv6_sockglue.c) 428 */ 429 430 extern int ipv6_setsockopt(struct sock *sk, int level, 431 int optname, 432 char __user *optval, 433 int optlen); 434 extern int ipv6_getsockopt(struct sock *sk, int level, 435 int optname, 436 char __user *optval, 437 int __user *optlen); 438 439 extern void ipv6_packet_init(void); 440 441 extern void ipv6_packet_cleanup(void); 442 443 extern int ip6_datagram_connect(struct sock *sk, 444 struct sockaddr *addr, int addr_len); 445 446 extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len); 447 extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, u16 port, 448 u32 info, u8 *payload); 449 extern void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info); 450 451 extern int inet6_release(struct socket *sock); 452 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr, 453 int addr_len); 454 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 455 int *uaddr_len, int peer); 456 extern int inet6_ioctl(struct socket *sock, unsigned int cmd, 457 unsigned long arg); 458 459 /* 460 * reassembly.c 461 */ 462 extern int sysctl_ip6frag_high_thresh; 463 extern int sysctl_ip6frag_low_thresh; 464 extern int sysctl_ip6frag_time; 465 extern int sysctl_ip6frag_secret_interval; 466 467 #endif /* __KERNEL__ */ 468 #endif /* _NET_IPV6_H */ 469 470 471 472