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