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_MOBILITY 135 /* Mobility header. */ 45 46 #define NEXTHDR_MAX 255 47 48 49 50 #define IPV6_DEFAULT_HOPLIMIT 64 51 #define IPV6_DEFAULT_MCASTHOPS 1 52 53 /* 54 * Addr type 55 * 56 * type - unicast | multicast 57 * scope - local | site | global 58 * v4 - compat 59 * v4mapped 60 * any 61 * loopback 62 */ 63 64 #define IPV6_ADDR_ANY 0x0000U 65 66 #define IPV6_ADDR_UNICAST 0x0001U 67 #define IPV6_ADDR_MULTICAST 0x0002U 68 69 #define IPV6_ADDR_LOOPBACK 0x0010U 70 #define IPV6_ADDR_LINKLOCAL 0x0020U 71 #define IPV6_ADDR_SITELOCAL 0x0040U 72 73 #define IPV6_ADDR_COMPATv4 0x0080U 74 75 #define IPV6_ADDR_SCOPE_MASK 0x00f0U 76 77 #define IPV6_ADDR_MAPPED 0x1000U 78 79 /* 80 * Addr scopes 81 */ 82 #define IPV6_ADDR_MC_SCOPE(a) \ 83 ((a)->s6_addr[1] & 0x0f) /* nonstandard */ 84 #define __IPV6_ADDR_SCOPE_INVALID -1 85 #define IPV6_ADDR_SCOPE_NODELOCAL 0x01 86 #define IPV6_ADDR_SCOPE_LINKLOCAL 0x02 87 #define IPV6_ADDR_SCOPE_SITELOCAL 0x05 88 #define IPV6_ADDR_SCOPE_ORGLOCAL 0x08 89 #define IPV6_ADDR_SCOPE_GLOBAL 0x0e 90 91 /* 92 * Addr flags 93 */ 94 #define IPV6_ADDR_MC_FLAG_TRANSIENT(a) \ 95 ((a)->s6_addr[1] & 0x10) 96 #define IPV6_ADDR_MC_FLAG_PREFIX(a) \ 97 ((a)->s6_addr[1] & 0x20) 98 #define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \ 99 ((a)->s6_addr[1] & 0x40) 100 101 /* 102 * fragmentation header 103 */ 104 105 struct frag_hdr { 106 __u8 nexthdr; 107 __u8 reserved; 108 __be16 frag_off; 109 __be32 identification; 110 }; 111 112 #define IP6_MF 0x0001 113 114 #include <net/sock.h> 115 116 /* sysctls */ 117 extern int sysctl_mld_max_msf; 118 119 #define _DEVINC(net, statname, modifier, idev, field) \ 120 ({ \ 121 struct inet6_dev *_idev = (idev); \ 122 if (likely(_idev != NULL)) \ 123 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \ 124 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\ 125 }) 126 127 /* per device counters are atomic_long_t */ 128 #define _DEVINCATOMIC(net, statname, modifier, idev, field) \ 129 ({ \ 130 struct inet6_dev *_idev = (idev); \ 131 if (likely(_idev != NULL)) \ 132 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \ 133 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\ 134 }) 135 136 /* per device and per net counters are atomic_long_t */ 137 #define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \ 138 ({ \ 139 struct inet6_dev *_idev = (idev); \ 140 if (likely(_idev != NULL)) \ 141 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \ 142 SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\ 143 }) 144 145 #define _DEVADD(net, statname, modifier, idev, field, val) \ 146 ({ \ 147 struct inet6_dev *_idev = (idev); \ 148 if (likely(_idev != NULL)) \ 149 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \ 150 SNMP_ADD_STATS##modifier((net)->mib.statname##_statistics, (field), (val));\ 151 }) 152 153 #define _DEVUPD(net, statname, modifier, idev, field, val) \ 154 ({ \ 155 struct inet6_dev *_idev = (idev); \ 156 if (likely(_idev != NULL)) \ 157 SNMP_UPD_PO_STATS##modifier((_idev)->stats.statname, field, (val)); \ 158 SNMP_UPD_PO_STATS##modifier((net)->mib.statname##_statistics, field, (val));\ 159 }) 160 161 /* MIBs */ 162 163 #define IP6_INC_STATS(net, idev,field) \ 164 _DEVINC(net, ipv6, 64, idev, field) 165 #define IP6_INC_STATS_BH(net, idev,field) \ 166 _DEVINC(net, ipv6, 64_BH, idev, field) 167 #define IP6_ADD_STATS(net, idev,field,val) \ 168 _DEVADD(net, ipv6, 64, idev, field, val) 169 #define IP6_ADD_STATS_BH(net, idev,field,val) \ 170 _DEVADD(net, ipv6, 64_BH, idev, field, val) 171 #define IP6_UPD_PO_STATS(net, idev,field,val) \ 172 _DEVUPD(net, ipv6, 64, idev, field, val) 173 #define IP6_UPD_PO_STATS_BH(net, idev,field,val) \ 174 _DEVUPD(net, ipv6, 64_BH, idev, field, val) 175 #define ICMP6_INC_STATS(net, idev, field) \ 176 _DEVINCATOMIC(net, icmpv6, , idev, field) 177 #define ICMP6_INC_STATS_BH(net, idev, field) \ 178 _DEVINCATOMIC(net, icmpv6, _BH, idev, field) 179 180 #define ICMP6MSGOUT_INC_STATS(net, idev, field) \ 181 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256) 182 #define ICMP6MSGOUT_INC_STATS_BH(net, idev, field) \ 183 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256) 184 #define ICMP6MSGIN_INC_STATS_BH(net, idev, field) \ 185 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field) 186 187 struct ip6_ra_chain { 188 struct ip6_ra_chain *next; 189 struct sock *sk; 190 int sel; 191 void (*destructor)(struct sock *); 192 }; 193 194 extern struct ip6_ra_chain *ip6_ra_chain; 195 extern rwlock_t ip6_ra_lock; 196 197 /* 198 This structure is prepared by protocol, when parsing 199 ancillary data and passed to IPv6. 200 */ 201 202 struct ipv6_txoptions { 203 /* Length of this structure */ 204 int tot_len; 205 206 /* length of extension headers */ 207 208 __u16 opt_flen; /* after fragment hdr */ 209 __u16 opt_nflen; /* before fragment hdr */ 210 211 struct ipv6_opt_hdr *hopopt; 212 struct ipv6_opt_hdr *dst0opt; 213 struct ipv6_rt_hdr *srcrt; /* Routing Header */ 214 struct ipv6_opt_hdr *dst1opt; 215 216 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */ 217 }; 218 219 struct ip6_flowlabel { 220 struct ip6_flowlabel __rcu *next; 221 __be32 label; 222 atomic_t users; 223 struct in6_addr dst; 224 struct ipv6_txoptions *opt; 225 unsigned long linger; 226 struct rcu_head rcu; 227 u8 share; 228 union { 229 struct pid *pid; 230 kuid_t uid; 231 } owner; 232 unsigned long lastuse; 233 unsigned long expires; 234 struct net *fl_net; 235 }; 236 237 #define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF) 238 #define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF) 239 240 struct ipv6_fl_socklist { 241 struct ipv6_fl_socklist __rcu *next; 242 struct ip6_flowlabel *fl; 243 struct rcu_head rcu; 244 }; 245 246 extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label); 247 extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space, 248 struct ip6_flowlabel * fl, 249 struct ipv6_txoptions * fopt); 250 extern void fl6_free_socklist(struct sock *sk); 251 extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen); 252 extern int ip6_flowlabel_init(void); 253 extern void ip6_flowlabel_cleanup(void); 254 255 static inline void fl6_sock_release(struct ip6_flowlabel *fl) 256 { 257 if (fl) 258 atomic_dec(&fl->users); 259 } 260 261 extern void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info); 262 263 int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, 264 struct icmp6hdr *thdr, int len); 265 266 struct dst_entry *icmpv6_route_lookup(struct net *net, struct sk_buff *skb, 267 struct sock *sk, struct flowi6 *fl6); 268 269 extern int ip6_ra_control(struct sock *sk, int sel); 270 271 extern int ipv6_parse_hopopts(struct sk_buff *skb); 272 273 extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt); 274 extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt, 275 int newtype, 276 struct ipv6_opt_hdr __user *newopt, 277 int newoptlen); 278 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space, 279 struct ipv6_txoptions *opt); 280 281 extern bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb); 282 283 static inline bool ipv6_accept_ra(struct inet6_dev *idev) 284 { 285 /* If forwarding is enabled, RA are not accepted unless the special 286 * hybrid mode (accept_ra=2) is enabled. 287 */ 288 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 : 289 idev->cnf.accept_ra; 290 } 291 292 #if IS_ENABLED(CONFIG_IPV6) 293 static inline int ip6_frag_nqueues(struct net *net) 294 { 295 return net->ipv6.frags.nqueues; 296 } 297 298 static inline int ip6_frag_mem(struct net *net) 299 { 300 return sum_frag_mem_limit(&net->ipv6.frags); 301 } 302 #endif 303 304 #define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */ 305 #define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */ 306 #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */ 307 308 extern int __ipv6_addr_type(const struct in6_addr *addr); 309 static inline int ipv6_addr_type(const struct in6_addr *addr) 310 { 311 return __ipv6_addr_type(addr) & 0xffff; 312 } 313 314 static inline int ipv6_addr_scope(const struct in6_addr *addr) 315 { 316 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK; 317 } 318 319 static inline int __ipv6_addr_src_scope(int type) 320 { 321 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16); 322 } 323 324 static inline int ipv6_addr_src_scope(const struct in6_addr *addr) 325 { 326 return __ipv6_addr_src_scope(__ipv6_addr_type(addr)); 327 } 328 329 static inline bool __ipv6_addr_needs_scope_id(int type) 330 { 331 return type & IPV6_ADDR_LINKLOCAL || 332 (type & IPV6_ADDR_MULTICAST && 333 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL))); 334 } 335 336 static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface) 337 { 338 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0; 339 } 340 341 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2) 342 { 343 return memcmp(a1, a2, sizeof(struct in6_addr)); 344 } 345 346 static inline bool 347 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m, 348 const struct in6_addr *a2) 349 { 350 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 351 const unsigned long *ul1 = (const unsigned long *)a1; 352 const unsigned long *ulm = (const unsigned long *)m; 353 const unsigned long *ul2 = (const unsigned long *)a2; 354 355 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) | 356 ((ul1[1] ^ ul2[1]) & ulm[1])); 357 #else 358 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) | 359 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) | 360 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) | 361 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3])); 362 #endif 363 } 364 365 static inline void ipv6_addr_prefix(struct in6_addr *pfx, 366 const struct in6_addr *addr, 367 int plen) 368 { 369 /* caller must guarantee 0 <= plen <= 128 */ 370 int o = plen >> 3, 371 b = plen & 0x7; 372 373 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr)); 374 memcpy(pfx->s6_addr, addr, o); 375 if (b != 0) 376 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b); 377 } 378 379 static inline void __ipv6_addr_set_half(__be32 *addr, 380 __be32 wh, __be32 wl) 381 { 382 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 383 #if defined(__BIG_ENDIAN) 384 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) { 385 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl)); 386 return; 387 } 388 #elif defined(__LITTLE_ENDIAN) 389 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) { 390 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh)); 391 return; 392 } 393 #endif 394 #endif 395 addr[0] = wh; 396 addr[1] = wl; 397 } 398 399 static inline void ipv6_addr_set(struct in6_addr *addr, 400 __be32 w1, __be32 w2, 401 __be32 w3, __be32 w4) 402 { 403 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2); 404 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4); 405 } 406 407 static inline bool ipv6_addr_equal(const struct in6_addr *a1, 408 const struct in6_addr *a2) 409 { 410 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 411 const unsigned long *ul1 = (const unsigned long *)a1; 412 const unsigned long *ul2 = (const unsigned long *)a2; 413 414 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL; 415 #else 416 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) | 417 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) | 418 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) | 419 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0; 420 #endif 421 } 422 423 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 424 static inline bool __ipv6_prefix_equal64_half(const __be64 *a1, 425 const __be64 *a2, 426 unsigned int len) 427 { 428 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len)))) 429 return false; 430 return true; 431 } 432 433 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1, 434 const struct in6_addr *addr2, 435 unsigned int prefixlen) 436 { 437 const __be64 *a1 = (const __be64 *)addr1; 438 const __be64 *a2 = (const __be64 *)addr2; 439 440 if (prefixlen >= 64) { 441 if (a1[0] ^ a2[0]) 442 return false; 443 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64); 444 } 445 return __ipv6_prefix_equal64_half(a1, a2, prefixlen); 446 } 447 #else 448 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1, 449 const struct in6_addr *addr2, 450 unsigned int prefixlen) 451 { 452 const __be32 *a1 = addr1->s6_addr32; 453 const __be32 *a2 = addr2->s6_addr32; 454 unsigned int pdw, pbi; 455 456 /* check complete u32 in prefix */ 457 pdw = prefixlen >> 5; 458 if (pdw && memcmp(a1, a2, pdw << 2)) 459 return false; 460 461 /* check incomplete u32 in prefix */ 462 pbi = prefixlen & 0x1f; 463 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi)))) 464 return false; 465 466 return true; 467 } 468 #endif 469 470 struct inet_frag_queue; 471 472 enum ip6_defrag_users { 473 IP6_DEFRAG_LOCAL_DELIVER, 474 IP6_DEFRAG_CONNTRACK_IN, 475 __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX, 476 IP6_DEFRAG_CONNTRACK_OUT, 477 __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX, 478 IP6_DEFRAG_CONNTRACK_BRIDGE_IN, 479 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX, 480 }; 481 482 struct ip6_create_arg { 483 __be32 id; 484 u32 user; 485 const struct in6_addr *src; 486 const struct in6_addr *dst; 487 u8 ecn; 488 }; 489 490 void ip6_frag_init(struct inet_frag_queue *q, void *a); 491 bool ip6_frag_match(struct inet_frag_queue *q, void *a); 492 493 /* 494 * Equivalent of ipv4 struct ip 495 */ 496 struct frag_queue { 497 struct inet_frag_queue q; 498 499 __be32 id; /* fragment id */ 500 u32 user; 501 struct in6_addr saddr; 502 struct in6_addr daddr; 503 504 int iif; 505 unsigned int csum; 506 __u16 nhoffset; 507 u8 ecn; 508 }; 509 510 void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq, 511 struct inet_frags *frags); 512 513 static inline bool ipv6_addr_any(const struct in6_addr *a) 514 { 515 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 516 const unsigned long *ul = (const unsigned long *)a; 517 518 return (ul[0] | ul[1]) == 0UL; 519 #else 520 return (a->s6_addr32[0] | a->s6_addr32[1] | 521 a->s6_addr32[2] | a->s6_addr32[3]) == 0; 522 #endif 523 } 524 525 static inline u32 ipv6_addr_hash(const struct in6_addr *a) 526 { 527 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 528 const unsigned long *ul = (const unsigned long *)a; 529 unsigned long x = ul[0] ^ ul[1]; 530 531 return (u32)(x ^ (x >> 32)); 532 #else 533 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^ 534 a->s6_addr32[2] ^ a->s6_addr32[3]); 535 #endif 536 } 537 538 /* more secured version of ipv6_addr_hash() */ 539 static inline u32 ipv6_addr_jhash(const struct in6_addr *a) 540 { 541 u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1]; 542 543 return jhash_3words(v, 544 (__force u32)a->s6_addr32[2], 545 (__force u32)a->s6_addr32[3], 546 ipv6_hash_secret); 547 } 548 549 static inline bool ipv6_addr_loopback(const struct in6_addr *a) 550 { 551 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 552 const unsigned long *ul = (const unsigned long *)a; 553 554 return (ul[0] | (ul[1] ^ cpu_to_be64(1))) == 0UL; 555 #else 556 return (a->s6_addr32[0] | a->s6_addr32[1] | 557 a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0; 558 #endif 559 } 560 561 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a) 562 { 563 return ( 564 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 565 *(__be64 *)a | 566 #else 567 (a->s6_addr32[0] | a->s6_addr32[1]) | 568 #endif 569 (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0UL; 570 } 571 572 /* 573 * Check for a RFC 4843 ORCHID address 574 * (Overlay Routable Cryptographic Hash Identifiers) 575 */ 576 static inline bool ipv6_addr_orchid(const struct in6_addr *a) 577 { 578 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010); 579 } 580 581 static inline void ipv6_addr_set_v4mapped(const __be32 addr, 582 struct in6_addr *v4mapped) 583 { 584 ipv6_addr_set(v4mapped, 585 0, 0, 586 htonl(0x0000FFFF), 587 addr); 588 } 589 590 /* 591 * find the first different bit between two addresses 592 * length of address must be a multiple of 32bits 593 */ 594 static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen) 595 { 596 const __be32 *a1 = token1, *a2 = token2; 597 int i; 598 599 addrlen >>= 2; 600 601 for (i = 0; i < addrlen; i++) { 602 __be32 xb = a1[i] ^ a2[i]; 603 if (xb) 604 return i * 32 + 31 - __fls(ntohl(xb)); 605 } 606 607 /* 608 * we should *never* get to this point since that 609 * would mean the addrs are equal 610 * 611 * However, we do get to it 8) And exacly, when 612 * addresses are equal 8) 613 * 614 * ip route add 1111::/128 via ... 615 * ip route add 1111::/64 via ... 616 * and we are here. 617 * 618 * Ideally, this function should stop comparison 619 * at prefix length. It does not, but it is still OK, 620 * if returned value is greater than prefix length. 621 * --ANK (980803) 622 */ 623 return addrlen << 5; 624 } 625 626 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 627 static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen) 628 { 629 const __be64 *a1 = token1, *a2 = token2; 630 int i; 631 632 addrlen >>= 3; 633 634 for (i = 0; i < addrlen; i++) { 635 __be64 xb = a1[i] ^ a2[i]; 636 if (xb) 637 return i * 64 + 63 - __fls(be64_to_cpu(xb)); 638 } 639 640 return addrlen << 6; 641 } 642 #endif 643 644 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen) 645 { 646 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 647 if (__builtin_constant_p(addrlen) && !(addrlen & 7)) 648 return __ipv6_addr_diff64(token1, token2, addrlen); 649 #endif 650 return __ipv6_addr_diff32(token1, token2, addrlen); 651 } 652 653 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2) 654 { 655 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr)); 656 } 657 658 extern void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt); 659 660 /* 661 * Header manipulation 662 */ 663 static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass, 664 __be32 flowlabel) 665 { 666 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel; 667 } 668 669 static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr) 670 { 671 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK; 672 } 673 674 /* 675 * Prototypes exported by ipv6 676 */ 677 678 /* 679 * rcv function (called from netdevice level) 680 */ 681 682 extern int ipv6_rcv(struct sk_buff *skb, 683 struct net_device *dev, 684 struct packet_type *pt, 685 struct net_device *orig_dev); 686 687 extern int ip6_rcv_finish(struct sk_buff *skb); 688 689 /* 690 * upper-layer output functions 691 */ 692 extern int ip6_xmit(struct sock *sk, 693 struct sk_buff *skb, 694 struct flowi6 *fl6, 695 struct ipv6_txoptions *opt, 696 int tclass); 697 698 extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr); 699 700 extern int ip6_append_data(struct sock *sk, 701 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb), 702 void *from, 703 int length, 704 int transhdrlen, 705 int hlimit, 706 int tclass, 707 struct ipv6_txoptions *opt, 708 struct flowi6 *fl6, 709 struct rt6_info *rt, 710 unsigned int flags, 711 int dontfrag); 712 713 extern int ip6_push_pending_frames(struct sock *sk); 714 715 extern void ip6_flush_pending_frames(struct sock *sk); 716 717 extern int ip6_dst_lookup(struct sock *sk, 718 struct dst_entry **dst, 719 struct flowi6 *fl6); 720 extern struct dst_entry * ip6_dst_lookup_flow(struct sock *sk, 721 struct flowi6 *fl6, 722 const struct in6_addr *final_dst, 723 bool can_sleep); 724 extern struct dst_entry * ip6_sk_dst_lookup_flow(struct sock *sk, 725 struct flowi6 *fl6, 726 const struct in6_addr *final_dst, 727 bool can_sleep); 728 extern struct dst_entry * ip6_blackhole_route(struct net *net, 729 struct dst_entry *orig_dst); 730 731 /* 732 * skb processing functions 733 */ 734 735 extern int ip6_output(struct sk_buff *skb); 736 extern int ip6_forward(struct sk_buff *skb); 737 extern int ip6_input(struct sk_buff *skb); 738 extern int ip6_mc_input(struct sk_buff *skb); 739 740 extern int __ip6_local_out(struct sk_buff *skb); 741 extern int ip6_local_out(struct sk_buff *skb); 742 743 /* 744 * Extension header (options) processing 745 */ 746 747 extern void ipv6_push_nfrag_opts(struct sk_buff *skb, 748 struct ipv6_txoptions *opt, 749 u8 *proto, 750 struct in6_addr **daddr_p); 751 extern void ipv6_push_frag_opts(struct sk_buff *skb, 752 struct ipv6_txoptions *opt, 753 u8 *proto); 754 755 extern int ipv6_skip_exthdr(const struct sk_buff *, int start, 756 u8 *nexthdrp, __be16 *frag_offp); 757 758 extern bool ipv6_ext_hdr(u8 nexthdr); 759 760 enum { 761 IP6_FH_F_FRAG = (1 << 0), 762 IP6_FH_F_AUTH = (1 << 1), 763 IP6_FH_F_SKIP_RH = (1 << 2), 764 }; 765 766 /* find specified header and get offset to it */ 767 extern int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, 768 int target, unsigned short *fragoff, int *fragflg); 769 770 extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type); 771 772 extern struct in6_addr *fl6_update_dst(struct flowi6 *fl6, 773 const struct ipv6_txoptions *opt, 774 struct in6_addr *orig); 775 776 /* 777 * socket options (ipv6_sockglue.c) 778 */ 779 780 extern int ipv6_setsockopt(struct sock *sk, int level, 781 int optname, 782 char __user *optval, 783 unsigned int optlen); 784 extern int ipv6_getsockopt(struct sock *sk, int level, 785 int optname, 786 char __user *optval, 787 int __user *optlen); 788 extern int compat_ipv6_setsockopt(struct sock *sk, 789 int level, 790 int optname, 791 char __user *optval, 792 unsigned int optlen); 793 extern int compat_ipv6_getsockopt(struct sock *sk, 794 int level, 795 int optname, 796 char __user *optval, 797 int __user *optlen); 798 799 extern int ip6_datagram_connect(struct sock *sk, 800 struct sockaddr *addr, int addr_len); 801 802 extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len); 803 extern int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len); 804 extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, 805 u32 info, u8 *payload); 806 extern void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info); 807 extern void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu); 808 809 extern int inet6_release(struct socket *sock); 810 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr, 811 int addr_len); 812 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 813 int *uaddr_len, int peer); 814 extern int inet6_ioctl(struct socket *sock, unsigned int cmd, 815 unsigned long arg); 816 817 extern int inet6_hash_connect(struct inet_timewait_death_row *death_row, 818 struct sock *sk); 819 820 /* 821 * reassembly.c 822 */ 823 extern const struct proto_ops inet6_stream_ops; 824 extern const struct proto_ops inet6_dgram_ops; 825 826 struct group_source_req; 827 struct group_filter; 828 829 extern int ip6_mc_source(int add, int omode, struct sock *sk, 830 struct group_source_req *pgsr); 831 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf); 832 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 833 struct group_filter __user *optval, 834 int __user *optlen); 835 extern unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr, 836 const struct in6_addr *daddr, u32 rnd); 837 838 #ifdef CONFIG_PROC_FS 839 extern int ac6_proc_init(struct net *net); 840 extern void ac6_proc_exit(struct net *net); 841 extern int raw6_proc_init(void); 842 extern void raw6_proc_exit(void); 843 extern int tcp6_proc_init(struct net *net); 844 extern void tcp6_proc_exit(struct net *net); 845 extern int udp6_proc_init(struct net *net); 846 extern void udp6_proc_exit(struct net *net); 847 extern int udplite6_proc_init(void); 848 extern void udplite6_proc_exit(void); 849 extern int ipv6_misc_proc_init(void); 850 extern void ipv6_misc_proc_exit(void); 851 extern int snmp6_register_dev(struct inet6_dev *idev); 852 extern int snmp6_unregister_dev(struct inet6_dev *idev); 853 854 #else 855 static inline int ac6_proc_init(struct net *net) { return 0; } 856 static inline void ac6_proc_exit(struct net *net) { } 857 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; } 858 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; } 859 #endif 860 861 #ifdef CONFIG_SYSCTL 862 extern struct ctl_table ipv6_route_table_template[]; 863 extern struct ctl_table ipv6_icmp_table_template[]; 864 865 extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net); 866 extern struct ctl_table *ipv6_route_sysctl_init(struct net *net); 867 extern int ipv6_sysctl_register(void); 868 extern void ipv6_sysctl_unregister(void); 869 #endif 870 871 #endif /* _NET_IPV6_H */ 872