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 #define IP6_OFFSET 0xFFF8 115 116 #include <net/sock.h> 117 118 /* sysctls */ 119 extern int sysctl_mld_max_msf; 120 121 #define _DEVINC(net, statname, modifier, idev, field) \ 122 ({ \ 123 struct inet6_dev *_idev = (idev); \ 124 if (likely(_idev != NULL)) \ 125 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \ 126 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\ 127 }) 128 129 /* per device counters are atomic_long_t */ 130 #define _DEVINCATOMIC(net, statname, modifier, idev, field) \ 131 ({ \ 132 struct inet6_dev *_idev = (idev); \ 133 if (likely(_idev != NULL)) \ 134 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \ 135 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\ 136 }) 137 138 /* per device and per net counters are atomic_long_t */ 139 #define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \ 140 ({ \ 141 struct inet6_dev *_idev = (idev); \ 142 if (likely(_idev != NULL)) \ 143 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \ 144 SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\ 145 }) 146 147 #define _DEVADD(net, statname, modifier, idev, field, val) \ 148 ({ \ 149 struct inet6_dev *_idev = (idev); \ 150 if (likely(_idev != NULL)) \ 151 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \ 152 SNMP_ADD_STATS##modifier((net)->mib.statname##_statistics, (field), (val));\ 153 }) 154 155 #define _DEVUPD(net, statname, modifier, idev, field, val) \ 156 ({ \ 157 struct inet6_dev *_idev = (idev); \ 158 if (likely(_idev != NULL)) \ 159 SNMP_UPD_PO_STATS##modifier((_idev)->stats.statname, field, (val)); \ 160 SNMP_UPD_PO_STATS##modifier((net)->mib.statname##_statistics, field, (val));\ 161 }) 162 163 /* MIBs */ 164 165 #define IP6_INC_STATS(net, idev,field) \ 166 _DEVINC(net, ipv6, 64, idev, field) 167 #define IP6_INC_STATS_BH(net, idev,field) \ 168 _DEVINC(net, ipv6, 64_BH, idev, field) 169 #define IP6_ADD_STATS(net, idev,field,val) \ 170 _DEVADD(net, ipv6, 64, idev, field, val) 171 #define IP6_ADD_STATS_BH(net, idev,field,val) \ 172 _DEVADD(net, ipv6, 64_BH, idev, field, val) 173 #define IP6_UPD_PO_STATS(net, idev,field,val) \ 174 _DEVUPD(net, ipv6, 64, idev, field, val) 175 #define IP6_UPD_PO_STATS_BH(net, idev,field,val) \ 176 _DEVUPD(net, ipv6, 64_BH, idev, field, val) 177 #define ICMP6_INC_STATS(net, idev, field) \ 178 _DEVINCATOMIC(net, icmpv6, , idev, field) 179 #define ICMP6_INC_STATS_BH(net, idev, field) \ 180 _DEVINCATOMIC(net, icmpv6, _BH, idev, field) 181 182 #define ICMP6MSGOUT_INC_STATS(net, idev, field) \ 183 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256) 184 #define ICMP6MSGOUT_INC_STATS_BH(net, idev, field) \ 185 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256) 186 #define ICMP6MSGIN_INC_STATS_BH(net, idev, field) \ 187 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field) 188 189 struct ip6_ra_chain { 190 struct ip6_ra_chain *next; 191 struct sock *sk; 192 int sel; 193 void (*destructor)(struct sock *); 194 }; 195 196 extern struct ip6_ra_chain *ip6_ra_chain; 197 extern rwlock_t ip6_ra_lock; 198 199 /* 200 This structure is prepared by protocol, when parsing 201 ancillary data and passed to IPv6. 202 */ 203 204 struct ipv6_txoptions { 205 /* Length of this structure */ 206 int tot_len; 207 208 /* length of extension headers */ 209 210 __u16 opt_flen; /* after fragment hdr */ 211 __u16 opt_nflen; /* before fragment hdr */ 212 213 struct ipv6_opt_hdr *hopopt; 214 struct ipv6_opt_hdr *dst0opt; 215 struct ipv6_rt_hdr *srcrt; /* Routing Header */ 216 struct ipv6_opt_hdr *dst1opt; 217 218 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */ 219 }; 220 221 struct ip6_flowlabel { 222 struct ip6_flowlabel __rcu *next; 223 __be32 label; 224 atomic_t users; 225 struct in6_addr dst; 226 struct ipv6_txoptions *opt; 227 unsigned long linger; 228 struct rcu_head rcu; 229 u8 share; 230 union { 231 struct pid *pid; 232 kuid_t uid; 233 } owner; 234 unsigned long lastuse; 235 unsigned long expires; 236 struct net *fl_net; 237 }; 238 239 #define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF) 240 #define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF) 241 #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK) 242 243 struct ipv6_fl_socklist { 244 struct ipv6_fl_socklist __rcu *next; 245 struct ip6_flowlabel *fl; 246 struct rcu_head rcu; 247 }; 248 249 struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label); 250 struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space, 251 struct ip6_flowlabel *fl, 252 struct ipv6_txoptions *fopt); 253 void fl6_free_socklist(struct sock *sk); 254 int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen); 255 int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq); 256 int ip6_flowlabel_init(void); 257 void ip6_flowlabel_cleanup(void); 258 259 static inline void fl6_sock_release(struct ip6_flowlabel *fl) 260 { 261 if (fl) 262 atomic_dec(&fl->users); 263 } 264 265 void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info); 266 267 int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, 268 struct icmp6hdr *thdr, int len); 269 270 struct dst_entry *icmpv6_route_lookup(struct net *net, struct sk_buff *skb, 271 struct sock *sk, struct flowi6 *fl6); 272 273 int ip6_ra_control(struct sock *sk, int sel); 274 275 int ipv6_parse_hopopts(struct sk_buff *skb); 276 277 struct ipv6_txoptions *ipv6_dup_options(struct sock *sk, 278 struct ipv6_txoptions *opt); 279 struct ipv6_txoptions *ipv6_renew_options(struct sock *sk, 280 struct ipv6_txoptions *opt, 281 int newtype, 282 struct ipv6_opt_hdr __user *newopt, 283 int newoptlen); 284 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space, 285 struct ipv6_txoptions *opt); 286 287 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb); 288 289 static inline bool ipv6_accept_ra(struct inet6_dev *idev) 290 { 291 /* If forwarding is enabled, RA are not accepted unless the special 292 * hybrid mode (accept_ra=2) is enabled. 293 */ 294 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 : 295 idev->cnf.accept_ra; 296 } 297 298 #if IS_ENABLED(CONFIG_IPV6) 299 static inline int ip6_frag_nqueues(struct net *net) 300 { 301 return net->ipv6.frags.nqueues; 302 } 303 304 static inline int ip6_frag_mem(struct net *net) 305 { 306 return sum_frag_mem_limit(&net->ipv6.frags); 307 } 308 #endif 309 310 #define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */ 311 #define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */ 312 #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */ 313 314 int __ipv6_addr_type(const struct in6_addr *addr); 315 static inline int ipv6_addr_type(const struct in6_addr *addr) 316 { 317 return __ipv6_addr_type(addr) & 0xffff; 318 } 319 320 static inline int ipv6_addr_scope(const struct in6_addr *addr) 321 { 322 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK; 323 } 324 325 static inline int __ipv6_addr_src_scope(int type) 326 { 327 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16); 328 } 329 330 static inline int ipv6_addr_src_scope(const struct in6_addr *addr) 331 { 332 return __ipv6_addr_src_scope(__ipv6_addr_type(addr)); 333 } 334 335 static inline bool __ipv6_addr_needs_scope_id(int type) 336 { 337 return type & IPV6_ADDR_LINKLOCAL || 338 (type & IPV6_ADDR_MULTICAST && 339 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL))); 340 } 341 342 static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface) 343 { 344 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0; 345 } 346 347 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2) 348 { 349 return memcmp(a1, a2, sizeof(struct in6_addr)); 350 } 351 352 static inline bool 353 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m, 354 const struct in6_addr *a2) 355 { 356 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 357 const unsigned long *ul1 = (const unsigned long *)a1; 358 const unsigned long *ulm = (const unsigned long *)m; 359 const unsigned long *ul2 = (const unsigned long *)a2; 360 361 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) | 362 ((ul1[1] ^ ul2[1]) & ulm[1])); 363 #else 364 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) | 365 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) | 366 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) | 367 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3])); 368 #endif 369 } 370 371 static inline void ipv6_addr_prefix(struct in6_addr *pfx, 372 const struct in6_addr *addr, 373 int plen) 374 { 375 /* caller must guarantee 0 <= plen <= 128 */ 376 int o = plen >> 3, 377 b = plen & 0x7; 378 379 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr)); 380 memcpy(pfx->s6_addr, addr, o); 381 if (b != 0) 382 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b); 383 } 384 385 static inline void __ipv6_addr_set_half(__be32 *addr, 386 __be32 wh, __be32 wl) 387 { 388 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 389 #if defined(__BIG_ENDIAN) 390 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) { 391 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl)); 392 return; 393 } 394 #elif defined(__LITTLE_ENDIAN) 395 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) { 396 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh)); 397 return; 398 } 399 #endif 400 #endif 401 addr[0] = wh; 402 addr[1] = wl; 403 } 404 405 static inline void ipv6_addr_set(struct in6_addr *addr, 406 __be32 w1, __be32 w2, 407 __be32 w3, __be32 w4) 408 { 409 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2); 410 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4); 411 } 412 413 static inline bool ipv6_addr_equal(const struct in6_addr *a1, 414 const struct in6_addr *a2) 415 { 416 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 417 const unsigned long *ul1 = (const unsigned long *)a1; 418 const unsigned long *ul2 = (const unsigned long *)a2; 419 420 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL; 421 #else 422 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) | 423 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) | 424 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) | 425 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0; 426 #endif 427 } 428 429 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 430 static inline bool __ipv6_prefix_equal64_half(const __be64 *a1, 431 const __be64 *a2, 432 unsigned int len) 433 { 434 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len)))) 435 return false; 436 return true; 437 } 438 439 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1, 440 const struct in6_addr *addr2, 441 unsigned int prefixlen) 442 { 443 const __be64 *a1 = (const __be64 *)addr1; 444 const __be64 *a2 = (const __be64 *)addr2; 445 446 if (prefixlen >= 64) { 447 if (a1[0] ^ a2[0]) 448 return false; 449 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64); 450 } 451 return __ipv6_prefix_equal64_half(a1, a2, prefixlen); 452 } 453 #else 454 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1, 455 const struct in6_addr *addr2, 456 unsigned int prefixlen) 457 { 458 const __be32 *a1 = addr1->s6_addr32; 459 const __be32 *a2 = addr2->s6_addr32; 460 unsigned int pdw, pbi; 461 462 /* check complete u32 in prefix */ 463 pdw = prefixlen >> 5; 464 if (pdw && memcmp(a1, a2, pdw << 2)) 465 return false; 466 467 /* check incomplete u32 in prefix */ 468 pbi = prefixlen & 0x1f; 469 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi)))) 470 return false; 471 472 return true; 473 } 474 #endif 475 476 struct inet_frag_queue; 477 478 enum ip6_defrag_users { 479 IP6_DEFRAG_LOCAL_DELIVER, 480 IP6_DEFRAG_CONNTRACK_IN, 481 __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX, 482 IP6_DEFRAG_CONNTRACK_OUT, 483 __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX, 484 IP6_DEFRAG_CONNTRACK_BRIDGE_IN, 485 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX, 486 }; 487 488 struct ip6_create_arg { 489 __be32 id; 490 u32 user; 491 const struct in6_addr *src; 492 const struct in6_addr *dst; 493 u8 ecn; 494 }; 495 496 void ip6_frag_init(struct inet_frag_queue *q, void *a); 497 bool ip6_frag_match(struct inet_frag_queue *q, void *a); 498 499 /* 500 * Equivalent of ipv4 struct ip 501 */ 502 struct frag_queue { 503 struct inet_frag_queue q; 504 505 __be32 id; /* fragment id */ 506 u32 user; 507 struct in6_addr saddr; 508 struct in6_addr daddr; 509 510 int iif; 511 unsigned int csum; 512 __u16 nhoffset; 513 u8 ecn; 514 }; 515 516 void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq, 517 struct inet_frags *frags); 518 519 static inline bool ipv6_addr_any(const struct in6_addr *a) 520 { 521 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 522 const unsigned long *ul = (const unsigned long *)a; 523 524 return (ul[0] | ul[1]) == 0UL; 525 #else 526 return (a->s6_addr32[0] | a->s6_addr32[1] | 527 a->s6_addr32[2] | a->s6_addr32[3]) == 0; 528 #endif 529 } 530 531 static inline u32 ipv6_addr_hash(const struct in6_addr *a) 532 { 533 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 534 const unsigned long *ul = (const unsigned long *)a; 535 unsigned long x = ul[0] ^ ul[1]; 536 537 return (u32)(x ^ (x >> 32)); 538 #else 539 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^ 540 a->s6_addr32[2] ^ a->s6_addr32[3]); 541 #endif 542 } 543 544 /* more secured version of ipv6_addr_hash() */ 545 static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval) 546 { 547 u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1]; 548 549 return jhash_3words(v, 550 (__force u32)a->s6_addr32[2], 551 (__force u32)a->s6_addr32[3], 552 initval); 553 } 554 555 static inline bool ipv6_addr_loopback(const struct in6_addr *a) 556 { 557 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 558 const unsigned long *ul = (const unsigned long *)a; 559 560 return (ul[0] | (ul[1] ^ cpu_to_be64(1))) == 0UL; 561 #else 562 return (a->s6_addr32[0] | a->s6_addr32[1] | 563 a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0; 564 #endif 565 } 566 567 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a) 568 { 569 return ( 570 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 571 *(__be64 *)a | 572 #else 573 (a->s6_addr32[0] | a->s6_addr32[1]) | 574 #endif 575 (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0UL; 576 } 577 578 /* 579 * Check for a RFC 4843 ORCHID address 580 * (Overlay Routable Cryptographic Hash Identifiers) 581 */ 582 static inline bool ipv6_addr_orchid(const struct in6_addr *a) 583 { 584 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010); 585 } 586 587 static inline void ipv6_addr_set_v4mapped(const __be32 addr, 588 struct in6_addr *v4mapped) 589 { 590 ipv6_addr_set(v4mapped, 591 0, 0, 592 htonl(0x0000FFFF), 593 addr); 594 } 595 596 /* 597 * find the first different bit between two addresses 598 * length of address must be a multiple of 32bits 599 */ 600 static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen) 601 { 602 const __be32 *a1 = token1, *a2 = token2; 603 int i; 604 605 addrlen >>= 2; 606 607 for (i = 0; i < addrlen; i++) { 608 __be32 xb = a1[i] ^ a2[i]; 609 if (xb) 610 return i * 32 + 31 - __fls(ntohl(xb)); 611 } 612 613 /* 614 * we should *never* get to this point since that 615 * would mean the addrs are equal 616 * 617 * However, we do get to it 8) And exacly, when 618 * addresses are equal 8) 619 * 620 * ip route add 1111::/128 via ... 621 * ip route add 1111::/64 via ... 622 * and we are here. 623 * 624 * Ideally, this function should stop comparison 625 * at prefix length. It does not, but it is still OK, 626 * if returned value is greater than prefix length. 627 * --ANK (980803) 628 */ 629 return addrlen << 5; 630 } 631 632 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 633 static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen) 634 { 635 const __be64 *a1 = token1, *a2 = token2; 636 int i; 637 638 addrlen >>= 3; 639 640 for (i = 0; i < addrlen; i++) { 641 __be64 xb = a1[i] ^ a2[i]; 642 if (xb) 643 return i * 64 + 63 - __fls(be64_to_cpu(xb)); 644 } 645 646 return addrlen << 6; 647 } 648 #endif 649 650 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen) 651 { 652 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 653 if (__builtin_constant_p(addrlen) && !(addrlen & 7)) 654 return __ipv6_addr_diff64(token1, token2, addrlen); 655 #endif 656 return __ipv6_addr_diff32(token1, token2, addrlen); 657 } 658 659 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2) 660 { 661 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr)); 662 } 663 664 void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt); 665 666 int ip6_dst_hoplimit(struct dst_entry *dst); 667 668 /* 669 * Header manipulation 670 */ 671 static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass, 672 __be32 flowlabel) 673 { 674 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel; 675 } 676 677 static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr) 678 { 679 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK; 680 } 681 682 static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr) 683 { 684 return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK; 685 } 686 687 /* 688 * Prototypes exported by ipv6 689 */ 690 691 /* 692 * rcv function (called from netdevice level) 693 */ 694 695 int ipv6_rcv(struct sk_buff *skb, struct net_device *dev, 696 struct packet_type *pt, struct net_device *orig_dev); 697 698 int ip6_rcv_finish(struct sk_buff *skb); 699 700 /* 701 * upper-layer output functions 702 */ 703 int ip6_xmit(struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6, 704 struct ipv6_txoptions *opt, int tclass); 705 706 int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr); 707 708 int ip6_append_data(struct sock *sk, 709 int getfrag(void *from, char *to, int offset, int len, 710 int odd, struct sk_buff *skb), 711 void *from, int length, int transhdrlen, int hlimit, 712 int tclass, struct ipv6_txoptions *opt, struct flowi6 *fl6, 713 struct rt6_info *rt, unsigned int flags, int dontfrag); 714 715 int ip6_push_pending_frames(struct sock *sk); 716 717 void ip6_flush_pending_frames(struct sock *sk); 718 719 int ip6_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi6 *fl6); 720 struct dst_entry *ip6_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6, 721 const struct in6_addr *final_dst); 722 struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6, 723 const struct in6_addr *final_dst); 724 struct dst_entry *ip6_blackhole_route(struct net *net, 725 struct dst_entry *orig_dst); 726 727 /* 728 * skb processing functions 729 */ 730 731 int ip6_output(struct sk_buff *skb); 732 int ip6_forward(struct sk_buff *skb); 733 int ip6_input(struct sk_buff *skb); 734 int ip6_mc_input(struct sk_buff *skb); 735 736 int __ip6_local_out(struct sk_buff *skb); 737 int ip6_local_out(struct sk_buff *skb); 738 739 /* 740 * Extension header (options) processing 741 */ 742 743 void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, 744 u8 *proto, struct in6_addr **daddr_p); 745 void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, 746 u8 *proto); 747 748 int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp, 749 __be16 *frag_offp); 750 751 bool ipv6_ext_hdr(u8 nexthdr); 752 753 enum { 754 IP6_FH_F_FRAG = (1 << 0), 755 IP6_FH_F_AUTH = (1 << 1), 756 IP6_FH_F_SKIP_RH = (1 << 2), 757 }; 758 759 /* find specified header and get offset to it */ 760 int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target, 761 unsigned short *fragoff, int *fragflg); 762 763 int ipv6_find_tlv(struct sk_buff *skb, int offset, int type); 764 765 struct in6_addr *fl6_update_dst(struct flowi6 *fl6, 766 const struct ipv6_txoptions *opt, 767 struct in6_addr *orig); 768 769 /* 770 * socket options (ipv6_sockglue.c) 771 */ 772 773 int ipv6_setsockopt(struct sock *sk, int level, int optname, 774 char __user *optval, unsigned int optlen); 775 int ipv6_getsockopt(struct sock *sk, int level, int optname, 776 char __user *optval, int __user *optlen); 777 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname, 778 char __user *optval, unsigned int optlen); 779 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname, 780 char __user *optval, int __user *optlen); 781 782 int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len); 783 784 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, 785 int *addr_len); 786 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len, 787 int *addr_len); 788 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, 789 u32 info, u8 *payload); 790 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info); 791 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu); 792 793 int inet6_release(struct socket *sock); 794 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len); 795 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len, 796 int peer); 797 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg); 798 799 int inet6_hash_connect(struct inet_timewait_death_row *death_row, 800 struct sock *sk); 801 802 /* 803 * reassembly.c 804 */ 805 extern const struct proto_ops inet6_stream_ops; 806 extern const struct proto_ops inet6_dgram_ops; 807 808 struct group_source_req; 809 struct group_filter; 810 811 int ip6_mc_source(int add, int omode, struct sock *sk, 812 struct group_source_req *pgsr); 813 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf); 814 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 815 struct group_filter __user *optval, int __user *optlen); 816 817 #ifdef CONFIG_PROC_FS 818 int ac6_proc_init(struct net *net); 819 void ac6_proc_exit(struct net *net); 820 int raw6_proc_init(void); 821 void raw6_proc_exit(void); 822 int tcp6_proc_init(struct net *net); 823 void tcp6_proc_exit(struct net *net); 824 int udp6_proc_init(struct net *net); 825 void udp6_proc_exit(struct net *net); 826 int udplite6_proc_init(void); 827 void udplite6_proc_exit(void); 828 int ipv6_misc_proc_init(void); 829 void ipv6_misc_proc_exit(void); 830 int snmp6_register_dev(struct inet6_dev *idev); 831 int snmp6_unregister_dev(struct inet6_dev *idev); 832 833 #else 834 static inline int ac6_proc_init(struct net *net) { return 0; } 835 static inline void ac6_proc_exit(struct net *net) { } 836 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; } 837 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; } 838 #endif 839 840 #ifdef CONFIG_SYSCTL 841 extern struct ctl_table ipv6_route_table_template[]; 842 extern struct ctl_table ipv6_icmp_table_template[]; 843 844 struct ctl_table *ipv6_icmp_sysctl_init(struct net *net); 845 struct ctl_table *ipv6_route_sysctl_init(struct net *net); 846 int ipv6_sysctl_register(void); 847 void ipv6_sysctl_unregister(void); 848 #endif 849 850 #endif /* _NET_IPV6_H */ 851