1 /* 2 * Linux INET6 implementation 3 * 4 * Authors: 5 * Pedro Roque <roque@di.fc.ul.pt> 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License 9 * as published by the Free Software Foundation; either version 10 * 2 of the License, or (at your option) any later version. 11 */ 12 13 #ifndef _NET_IPV6_H 14 #define _NET_IPV6_H 15 16 #include <linux/ipv6.h> 17 #include <linux/hardirq.h> 18 #include <linux/jhash.h> 19 #include <net/if_inet6.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_GRE 47 /* GRE header. */ 39 #define NEXTHDR_ESP 50 /* Encapsulating security payload. */ 40 #define NEXTHDR_AUTH 51 /* Authentication header. */ 41 #define NEXTHDR_ICMP 58 /* ICMP for IPv6. */ 42 #define NEXTHDR_NONE 59 /* No next header */ 43 #define NEXTHDR_DEST 60 /* Destination options header. */ 44 #define NEXTHDR_SCTP 132 /* SCTP message. */ 45 #define NEXTHDR_MOBILITY 135 /* Mobility header. */ 46 47 #define NEXTHDR_MAX 255 48 49 50 51 #define IPV6_DEFAULT_HOPLIMIT 64 52 #define IPV6_DEFAULT_MCASTHOPS 1 53 54 /* 55 * Addr type 56 * 57 * type - unicast | multicast 58 * scope - local | site | global 59 * v4 - compat 60 * v4mapped 61 * any 62 * loopback 63 */ 64 65 #define IPV6_ADDR_ANY 0x0000U 66 67 #define IPV6_ADDR_UNICAST 0x0001U 68 #define IPV6_ADDR_MULTICAST 0x0002U 69 70 #define IPV6_ADDR_LOOPBACK 0x0010U 71 #define IPV6_ADDR_LINKLOCAL 0x0020U 72 #define IPV6_ADDR_SITELOCAL 0x0040U 73 74 #define IPV6_ADDR_COMPATv4 0x0080U 75 76 #define IPV6_ADDR_SCOPE_MASK 0x00f0U 77 78 #define IPV6_ADDR_MAPPED 0x1000U 79 80 /* 81 * Addr scopes 82 */ 83 #define IPV6_ADDR_MC_SCOPE(a) \ 84 ((a)->s6_addr[1] & 0x0f) /* nonstandard */ 85 #define __IPV6_ADDR_SCOPE_INVALID -1 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 * Addr flags 94 */ 95 #define IPV6_ADDR_MC_FLAG_TRANSIENT(a) \ 96 ((a)->s6_addr[1] & 0x10) 97 #define IPV6_ADDR_MC_FLAG_PREFIX(a) \ 98 ((a)->s6_addr[1] & 0x20) 99 #define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \ 100 ((a)->s6_addr[1] & 0x40) 101 102 /* 103 * fragmentation header 104 */ 105 106 struct frag_hdr { 107 __u8 nexthdr; 108 __u8 reserved; 109 __be16 frag_off; 110 __be32 identification; 111 }; 112 113 #define IP6_MF 0x0001 114 115 #include <net/sock.h> 116 117 /* sysctls */ 118 extern int sysctl_mld_max_msf; 119 120 #define _DEVINC(net, statname, modifier, idev, field) \ 121 ({ \ 122 struct inet6_dev *_idev = (idev); \ 123 if (likely(_idev != NULL)) \ 124 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \ 125 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\ 126 }) 127 128 /* per device counters are atomic_long_t */ 129 #define _DEVINCATOMIC(net, statname, modifier, idev, field) \ 130 ({ \ 131 struct inet6_dev *_idev = (idev); \ 132 if (likely(_idev != NULL)) \ 133 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \ 134 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\ 135 }) 136 137 /* per device and per net counters are atomic_long_t */ 138 #define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \ 139 ({ \ 140 struct inet6_dev *_idev = (idev); \ 141 if (likely(_idev != NULL)) \ 142 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \ 143 SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\ 144 }) 145 146 #define _DEVADD(net, statname, modifier, idev, field, val) \ 147 ({ \ 148 struct inet6_dev *_idev = (idev); \ 149 if (likely(_idev != NULL)) \ 150 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \ 151 SNMP_ADD_STATS##modifier((net)->mib.statname##_statistics, (field), (val));\ 152 }) 153 154 #define _DEVUPD(net, statname, modifier, idev, field, val) \ 155 ({ \ 156 struct inet6_dev *_idev = (idev); \ 157 if (likely(_idev != NULL)) \ 158 SNMP_UPD_PO_STATS##modifier((_idev)->stats.statname, field, (val)); \ 159 SNMP_UPD_PO_STATS##modifier((net)->mib.statname##_statistics, field, (val));\ 160 }) 161 162 /* MIBs */ 163 164 #define IP6_INC_STATS(net, idev,field) \ 165 _DEVINC(net, ipv6, 64, idev, field) 166 #define IP6_INC_STATS_BH(net, idev,field) \ 167 _DEVINC(net, ipv6, 64_BH, idev, field) 168 #define IP6_ADD_STATS(net, idev,field,val) \ 169 _DEVADD(net, ipv6, 64, idev, field, val) 170 #define IP6_ADD_STATS_BH(net, idev,field,val) \ 171 _DEVADD(net, ipv6, 64_BH, idev, field, val) 172 #define IP6_UPD_PO_STATS(net, idev,field,val) \ 173 _DEVUPD(net, ipv6, 64, idev, field, val) 174 #define IP6_UPD_PO_STATS_BH(net, idev,field,val) \ 175 _DEVUPD(net, ipv6, 64_BH, idev, field, val) 176 #define ICMP6_INC_STATS(net, idev, field) \ 177 _DEVINCATOMIC(net, icmpv6, , idev, field) 178 #define ICMP6_INC_STATS_BH(net, idev, field) \ 179 _DEVINCATOMIC(net, icmpv6, _BH, idev, field) 180 181 #define ICMP6MSGOUT_INC_STATS(net, idev, field) \ 182 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256) 183 #define ICMP6MSGOUT_INC_STATS_BH(net, idev, field) \ 184 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256) 185 #define ICMP6MSGIN_INC_STATS_BH(net, idev, field) \ 186 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field) 187 188 struct ip6_ra_chain { 189 struct ip6_ra_chain *next; 190 struct sock *sk; 191 int sel; 192 void (*destructor)(struct sock *); 193 }; 194 195 extern struct ip6_ra_chain *ip6_ra_chain; 196 extern rwlock_t ip6_ra_lock; 197 198 /* 199 This structure is prepared by protocol, when parsing 200 ancillary data and passed to IPv6. 201 */ 202 203 struct ipv6_txoptions { 204 /* Length of this structure */ 205 int tot_len; 206 207 /* length of extension headers */ 208 209 __u16 opt_flen; /* after fragment hdr */ 210 __u16 opt_nflen; /* before fragment hdr */ 211 212 struct ipv6_opt_hdr *hopopt; 213 struct ipv6_opt_hdr *dst0opt; 214 struct ipv6_rt_hdr *srcrt; /* Routing Header */ 215 struct ipv6_opt_hdr *dst1opt; 216 217 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */ 218 }; 219 220 struct ip6_flowlabel { 221 struct ip6_flowlabel __rcu *next; 222 __be32 label; 223 atomic_t users; 224 struct in6_addr dst; 225 struct ipv6_txoptions *opt; 226 unsigned long linger; 227 struct rcu_head rcu; 228 u8 share; 229 union { 230 struct pid *pid; 231 kuid_t uid; 232 } owner; 233 unsigned long lastuse; 234 unsigned long expires; 235 struct net *fl_net; 236 }; 237 238 #define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF) 239 #define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF) 240 241 struct ipv6_fl_socklist { 242 struct ipv6_fl_socklist __rcu *next; 243 struct ip6_flowlabel *fl; 244 struct rcu_head rcu; 245 }; 246 247 extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label); 248 extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space, 249 struct ip6_flowlabel * fl, 250 struct ipv6_txoptions * fopt); 251 extern void fl6_free_socklist(struct sock *sk); 252 extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen); 253 extern int ip6_flowlabel_init(void); 254 extern void ip6_flowlabel_cleanup(void); 255 256 static inline void fl6_sock_release(struct ip6_flowlabel *fl) 257 { 258 if (fl) 259 atomic_dec(&fl->users); 260 } 261 262 extern void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info); 263 264 int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, 265 struct icmp6hdr *thdr, int len); 266 267 struct dst_entry *icmpv6_route_lookup(struct net *net, struct sk_buff *skb, 268 struct sock *sk, struct flowi6 *fl6); 269 270 extern int ip6_ra_control(struct sock *sk, int sel); 271 272 extern int ipv6_parse_hopopts(struct sk_buff *skb); 273 274 extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt); 275 extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt, 276 int newtype, 277 struct ipv6_opt_hdr __user *newopt, 278 int newoptlen); 279 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space, 280 struct ipv6_txoptions *opt); 281 282 extern bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb); 283 284 static inline bool ipv6_accept_ra(struct inet6_dev *idev) 285 { 286 /* If forwarding is enabled, RA are not accepted unless the special 287 * hybrid mode (accept_ra=2) is enabled. 288 */ 289 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 : 290 idev->cnf.accept_ra; 291 } 292 293 #if IS_ENABLED(CONFIG_IPV6) 294 static inline int ip6_frag_nqueues(struct net *net) 295 { 296 return net->ipv6.frags.nqueues; 297 } 298 299 static inline int ip6_frag_mem(struct net *net) 300 { 301 return sum_frag_mem_limit(&net->ipv6.frags); 302 } 303 #endif 304 305 #define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */ 306 #define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */ 307 #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */ 308 309 extern int __ipv6_addr_type(const struct in6_addr *addr); 310 static inline int ipv6_addr_type(const struct in6_addr *addr) 311 { 312 return __ipv6_addr_type(addr) & 0xffff; 313 } 314 315 static inline int ipv6_addr_scope(const struct in6_addr *addr) 316 { 317 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK; 318 } 319 320 static inline int __ipv6_addr_src_scope(int type) 321 { 322 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16); 323 } 324 325 static inline int ipv6_addr_src_scope(const struct in6_addr *addr) 326 { 327 return __ipv6_addr_src_scope(__ipv6_addr_type(addr)); 328 } 329 330 static inline bool __ipv6_addr_needs_scope_id(int type) 331 { 332 return type & IPV6_ADDR_LINKLOCAL || 333 (type & IPV6_ADDR_MULTICAST && 334 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL))); 335 } 336 337 static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface) 338 { 339 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0; 340 } 341 342 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2) 343 { 344 return memcmp(a1, a2, sizeof(struct in6_addr)); 345 } 346 347 static inline bool 348 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m, 349 const struct in6_addr *a2) 350 { 351 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 352 const unsigned long *ul1 = (const unsigned long *)a1; 353 const unsigned long *ulm = (const unsigned long *)m; 354 const unsigned long *ul2 = (const unsigned long *)a2; 355 356 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) | 357 ((ul1[1] ^ ul2[1]) & ulm[1])); 358 #else 359 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) | 360 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) | 361 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) | 362 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3])); 363 #endif 364 } 365 366 static inline void ipv6_addr_prefix(struct in6_addr *pfx, 367 const struct in6_addr *addr, 368 int plen) 369 { 370 /* caller must guarantee 0 <= plen <= 128 */ 371 int o = plen >> 3, 372 b = plen & 0x7; 373 374 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr)); 375 memcpy(pfx->s6_addr, addr, o); 376 if (b != 0) 377 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b); 378 } 379 380 static inline void __ipv6_addr_set_half(__be32 *addr, 381 __be32 wh, __be32 wl) 382 { 383 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 384 #if defined(__BIG_ENDIAN) 385 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) { 386 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl)); 387 return; 388 } 389 #elif defined(__LITTLE_ENDIAN) 390 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) { 391 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh)); 392 return; 393 } 394 #endif 395 #endif 396 addr[0] = wh; 397 addr[1] = wl; 398 } 399 400 static inline void ipv6_addr_set(struct in6_addr *addr, 401 __be32 w1, __be32 w2, 402 __be32 w3, __be32 w4) 403 { 404 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2); 405 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4); 406 } 407 408 static inline bool ipv6_addr_equal(const struct in6_addr *a1, 409 const struct in6_addr *a2) 410 { 411 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 412 const unsigned long *ul1 = (const unsigned long *)a1; 413 const unsigned long *ul2 = (const unsigned long *)a2; 414 415 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL; 416 #else 417 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) | 418 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) | 419 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) | 420 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0; 421 #endif 422 } 423 424 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 425 static inline bool __ipv6_prefix_equal64_half(const __be64 *a1, 426 const __be64 *a2, 427 unsigned int len) 428 { 429 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len)))) 430 return false; 431 return true; 432 } 433 434 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1, 435 const struct in6_addr *addr2, 436 unsigned int prefixlen) 437 { 438 const __be64 *a1 = (const __be64 *)addr1; 439 const __be64 *a2 = (const __be64 *)addr2; 440 441 if (prefixlen >= 64) { 442 if (a1[0] ^ a2[0]) 443 return false; 444 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64); 445 } 446 return __ipv6_prefix_equal64_half(a1, a2, prefixlen); 447 } 448 #else 449 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1, 450 const struct in6_addr *addr2, 451 unsigned int prefixlen) 452 { 453 const __be32 *a1 = addr1->s6_addr32; 454 const __be32 *a2 = addr2->s6_addr32; 455 unsigned int pdw, pbi; 456 457 /* check complete u32 in prefix */ 458 pdw = prefixlen >> 5; 459 if (pdw && memcmp(a1, a2, pdw << 2)) 460 return false; 461 462 /* check incomplete u32 in prefix */ 463 pbi = prefixlen & 0x1f; 464 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi)))) 465 return false; 466 467 return true; 468 } 469 #endif 470 471 struct inet_frag_queue; 472 473 enum ip6_defrag_users { 474 IP6_DEFRAG_LOCAL_DELIVER, 475 IP6_DEFRAG_CONNTRACK_IN, 476 __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX, 477 IP6_DEFRAG_CONNTRACK_OUT, 478 __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX, 479 IP6_DEFRAG_CONNTRACK_BRIDGE_IN, 480 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX, 481 }; 482 483 struct ip6_create_arg { 484 __be32 id; 485 u32 user; 486 const struct in6_addr *src; 487 const struct in6_addr *dst; 488 u8 ecn; 489 }; 490 491 void ip6_frag_init(struct inet_frag_queue *q, void *a); 492 bool ip6_frag_match(struct inet_frag_queue *q, void *a); 493 494 /* 495 * Equivalent of ipv4 struct ip 496 */ 497 struct frag_queue { 498 struct inet_frag_queue q; 499 500 __be32 id; /* fragment id */ 501 u32 user; 502 struct in6_addr saddr; 503 struct in6_addr daddr; 504 505 int iif; 506 unsigned int csum; 507 __u16 nhoffset; 508 u8 ecn; 509 }; 510 511 void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq, 512 struct inet_frags *frags); 513 514 static inline bool ipv6_addr_any(const struct in6_addr *a) 515 { 516 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 517 const unsigned long *ul = (const unsigned long *)a; 518 519 return (ul[0] | ul[1]) == 0UL; 520 #else 521 return (a->s6_addr32[0] | a->s6_addr32[1] | 522 a->s6_addr32[2] | a->s6_addr32[3]) == 0; 523 #endif 524 } 525 526 static inline u32 ipv6_addr_hash(const struct in6_addr *a) 527 { 528 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 529 const unsigned long *ul = (const unsigned long *)a; 530 unsigned long x = ul[0] ^ ul[1]; 531 532 return (u32)(x ^ (x >> 32)); 533 #else 534 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^ 535 a->s6_addr32[2] ^ a->s6_addr32[3]); 536 #endif 537 } 538 539 /* more secured version of ipv6_addr_hash() */ 540 static inline u32 ipv6_addr_jhash(const struct in6_addr *a) 541 { 542 u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1]; 543 544 return jhash_3words(v, 545 (__force u32)a->s6_addr32[2], 546 (__force u32)a->s6_addr32[3], 547 ipv6_hash_secret); 548 } 549 550 static inline bool ipv6_addr_loopback(const struct in6_addr *a) 551 { 552 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 553 const unsigned long *ul = (const unsigned long *)a; 554 555 return (ul[0] | (ul[1] ^ cpu_to_be64(1))) == 0UL; 556 #else 557 return (a->s6_addr32[0] | a->s6_addr32[1] | 558 a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0; 559 #endif 560 } 561 562 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a) 563 { 564 return ( 565 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 566 *(__be64 *)a | 567 #else 568 (a->s6_addr32[0] | a->s6_addr32[1]) | 569 #endif 570 (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0UL; 571 } 572 573 /* 574 * Check for a RFC 4843 ORCHID address 575 * (Overlay Routable Cryptographic Hash Identifiers) 576 */ 577 static inline bool ipv6_addr_orchid(const struct in6_addr *a) 578 { 579 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010); 580 } 581 582 static inline void ipv6_addr_set_v4mapped(const __be32 addr, 583 struct in6_addr *v4mapped) 584 { 585 ipv6_addr_set(v4mapped, 586 0, 0, 587 htonl(0x0000FFFF), 588 addr); 589 } 590 591 /* 592 * find the first different bit between two addresses 593 * length of address must be a multiple of 32bits 594 */ 595 static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen) 596 { 597 const __be32 *a1 = token1, *a2 = token2; 598 int i; 599 600 addrlen >>= 2; 601 602 for (i = 0; i < addrlen; i++) { 603 __be32 xb = a1[i] ^ a2[i]; 604 if (xb) 605 return i * 32 + 31 - __fls(ntohl(xb)); 606 } 607 608 /* 609 * we should *never* get to this point since that 610 * would mean the addrs are equal 611 * 612 * However, we do get to it 8) And exacly, when 613 * addresses are equal 8) 614 * 615 * ip route add 1111::/128 via ... 616 * ip route add 1111::/64 via ... 617 * and we are here. 618 * 619 * Ideally, this function should stop comparison 620 * at prefix length. It does not, but it is still OK, 621 * if returned value is greater than prefix length. 622 * --ANK (980803) 623 */ 624 return addrlen << 5; 625 } 626 627 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 628 static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen) 629 { 630 const __be64 *a1 = token1, *a2 = token2; 631 int i; 632 633 addrlen >>= 3; 634 635 for (i = 0; i < addrlen; i++) { 636 __be64 xb = a1[i] ^ a2[i]; 637 if (xb) 638 return i * 64 + 63 - __fls(be64_to_cpu(xb)); 639 } 640 641 return addrlen << 6; 642 } 643 #endif 644 645 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen) 646 { 647 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 648 if (__builtin_constant_p(addrlen) && !(addrlen & 7)) 649 return __ipv6_addr_diff64(token1, token2, addrlen); 650 #endif 651 return __ipv6_addr_diff32(token1, token2, addrlen); 652 } 653 654 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2) 655 { 656 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr)); 657 } 658 659 extern void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt); 660 661 extern int ip6_dst_hoplimit(struct dst_entry *dst); 662 663 /* 664 * Header manipulation 665 */ 666 static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass, 667 __be32 flowlabel) 668 { 669 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel; 670 } 671 672 static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr) 673 { 674 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK; 675 } 676 677 /* 678 * Prototypes exported by ipv6 679 */ 680 681 /* 682 * rcv function (called from netdevice level) 683 */ 684 685 extern int ipv6_rcv(struct sk_buff *skb, 686 struct net_device *dev, 687 struct packet_type *pt, 688 struct net_device *orig_dev); 689 690 extern int ip6_rcv_finish(struct sk_buff *skb); 691 692 /* 693 * upper-layer output functions 694 */ 695 extern int ip6_xmit(struct sock *sk, 696 struct sk_buff *skb, 697 struct flowi6 *fl6, 698 struct ipv6_txoptions *opt, 699 int tclass); 700 701 extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr); 702 703 extern int ip6_append_data(struct sock *sk, 704 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb), 705 void *from, 706 int length, 707 int transhdrlen, 708 int hlimit, 709 int tclass, 710 struct ipv6_txoptions *opt, 711 struct flowi6 *fl6, 712 struct rt6_info *rt, 713 unsigned int flags, 714 int dontfrag); 715 716 extern int ip6_push_pending_frames(struct sock *sk); 717 718 extern void ip6_flush_pending_frames(struct sock *sk); 719 720 extern int ip6_dst_lookup(struct sock *sk, 721 struct dst_entry **dst, 722 struct flowi6 *fl6); 723 extern struct dst_entry * ip6_dst_lookup_flow(struct sock *sk, 724 struct flowi6 *fl6, 725 const struct in6_addr *final_dst, 726 bool can_sleep); 727 extern struct dst_entry * ip6_sk_dst_lookup_flow(struct sock *sk, 728 struct flowi6 *fl6, 729 const struct in6_addr *final_dst, 730 bool can_sleep); 731 extern struct dst_entry * ip6_blackhole_route(struct net *net, 732 struct dst_entry *orig_dst); 733 734 /* 735 * skb processing functions 736 */ 737 738 extern int ip6_output(struct sk_buff *skb); 739 extern int ip6_forward(struct sk_buff *skb); 740 extern int ip6_input(struct sk_buff *skb); 741 extern int ip6_mc_input(struct sk_buff *skb); 742 743 extern int __ip6_local_out(struct sk_buff *skb); 744 extern int ip6_local_out(struct sk_buff *skb); 745 746 /* 747 * Extension header (options) processing 748 */ 749 750 extern void ipv6_push_nfrag_opts(struct sk_buff *skb, 751 struct ipv6_txoptions *opt, 752 u8 *proto, 753 struct in6_addr **daddr_p); 754 extern void ipv6_push_frag_opts(struct sk_buff *skb, 755 struct ipv6_txoptions *opt, 756 u8 *proto); 757 758 extern int ipv6_skip_exthdr(const struct sk_buff *, int start, 759 u8 *nexthdrp, __be16 *frag_offp); 760 761 extern bool ipv6_ext_hdr(u8 nexthdr); 762 763 enum { 764 IP6_FH_F_FRAG = (1 << 0), 765 IP6_FH_F_AUTH = (1 << 1), 766 IP6_FH_F_SKIP_RH = (1 << 2), 767 }; 768 769 /* find specified header and get offset to it */ 770 extern int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, 771 int target, unsigned short *fragoff, int *fragflg); 772 773 extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type); 774 775 extern struct in6_addr *fl6_update_dst(struct flowi6 *fl6, 776 const struct ipv6_txoptions *opt, 777 struct in6_addr *orig); 778 779 /* 780 * socket options (ipv6_sockglue.c) 781 */ 782 783 extern int ipv6_setsockopt(struct sock *sk, int level, 784 int optname, 785 char __user *optval, 786 unsigned int optlen); 787 extern int ipv6_getsockopt(struct sock *sk, int level, 788 int optname, 789 char __user *optval, 790 int __user *optlen); 791 extern int compat_ipv6_setsockopt(struct sock *sk, 792 int level, 793 int optname, 794 char __user *optval, 795 unsigned int optlen); 796 extern int compat_ipv6_getsockopt(struct sock *sk, 797 int level, 798 int optname, 799 char __user *optval, 800 int __user *optlen); 801 802 extern int ip6_datagram_connect(struct sock *sk, 803 struct sockaddr *addr, int addr_len); 804 805 extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len); 806 extern int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len); 807 extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, 808 u32 info, u8 *payload); 809 extern void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info); 810 extern void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu); 811 812 extern int inet6_release(struct socket *sock); 813 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr, 814 int addr_len); 815 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 816 int *uaddr_len, int peer); 817 extern int inet6_ioctl(struct socket *sock, unsigned int cmd, 818 unsigned long arg); 819 820 extern int inet6_hash_connect(struct inet_timewait_death_row *death_row, 821 struct sock *sk); 822 823 /* 824 * reassembly.c 825 */ 826 extern const struct proto_ops inet6_stream_ops; 827 extern const struct proto_ops inet6_dgram_ops; 828 829 struct group_source_req; 830 struct group_filter; 831 832 extern int ip6_mc_source(int add, int omode, struct sock *sk, 833 struct group_source_req *pgsr); 834 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf); 835 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 836 struct group_filter __user *optval, 837 int __user *optlen); 838 extern unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr, 839 const struct in6_addr *daddr, u32 rnd); 840 841 #ifdef CONFIG_PROC_FS 842 extern int ac6_proc_init(struct net *net); 843 extern void ac6_proc_exit(struct net *net); 844 extern int raw6_proc_init(void); 845 extern void raw6_proc_exit(void); 846 extern int tcp6_proc_init(struct net *net); 847 extern void tcp6_proc_exit(struct net *net); 848 extern int udp6_proc_init(struct net *net); 849 extern void udp6_proc_exit(struct net *net); 850 extern int udplite6_proc_init(void); 851 extern void udplite6_proc_exit(void); 852 extern int ipv6_misc_proc_init(void); 853 extern void ipv6_misc_proc_exit(void); 854 extern int snmp6_register_dev(struct inet6_dev *idev); 855 extern int snmp6_unregister_dev(struct inet6_dev *idev); 856 857 #else 858 static inline int ac6_proc_init(struct net *net) { return 0; } 859 static inline void ac6_proc_exit(struct net *net) { } 860 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; } 861 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; } 862 #endif 863 864 #ifdef CONFIG_SYSCTL 865 extern struct ctl_table ipv6_route_table_template[]; 866 extern struct ctl_table ipv6_icmp_table_template[]; 867 868 extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net); 869 extern struct ctl_table *ipv6_route_sysctl_init(struct net *net); 870 extern int ipv6_sysctl_register(void); 871 extern void ipv6_sysctl_unregister(void); 872 #endif 873 874 #endif /* _NET_IPV6_H */ 875