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