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 <net/if_inet6.h> 19 #include <net/ndisc.h> 20 #include <net/flow.h> 21 #include <net/snmp.h> 22 23 #define SIN6_LEN_RFC2133 24 24 25 #define IPV6_MAXPLEN 65535 26 27 /* 28 * NextHeader field of IPv6 header 29 */ 30 31 #define NEXTHDR_HOP 0 /* Hop-by-hop option header. */ 32 #define NEXTHDR_TCP 6 /* TCP segment. */ 33 #define NEXTHDR_UDP 17 /* UDP message. */ 34 #define NEXTHDR_IPV6 41 /* IPv6 in IPv6 */ 35 #define NEXTHDR_ROUTING 43 /* Routing header. */ 36 #define NEXTHDR_FRAGMENT 44 /* Fragmentation/reassembly header. */ 37 #define NEXTHDR_GRE 47 /* GRE header. */ 38 #define NEXTHDR_ESP 50 /* Encapsulating security payload. */ 39 #define NEXTHDR_AUTH 51 /* Authentication header. */ 40 #define NEXTHDR_ICMP 58 /* ICMP for IPv6. */ 41 #define NEXTHDR_NONE 59 /* No next header */ 42 #define NEXTHDR_DEST 60 /* Destination options header. */ 43 #define NEXTHDR_MOBILITY 135 /* Mobility header. */ 44 45 #define NEXTHDR_MAX 255 46 47 48 49 #define IPV6_DEFAULT_HOPLIMIT 64 50 #define IPV6_DEFAULT_MCASTHOPS 1 51 52 /* 53 * Addr type 54 * 55 * type - unicast | multicast 56 * scope - local | site | global 57 * v4 - compat 58 * v4mapped 59 * any 60 * loopback 61 */ 62 63 #define IPV6_ADDR_ANY 0x0000U 64 65 #define IPV6_ADDR_UNICAST 0x0001U 66 #define IPV6_ADDR_MULTICAST 0x0002U 67 68 #define IPV6_ADDR_LOOPBACK 0x0010U 69 #define IPV6_ADDR_LINKLOCAL 0x0020U 70 #define IPV6_ADDR_SITELOCAL 0x0040U 71 72 #define IPV6_ADDR_COMPATv4 0x0080U 73 74 #define IPV6_ADDR_SCOPE_MASK 0x00f0U 75 76 #define IPV6_ADDR_MAPPED 0x1000U 77 78 /* 79 * Addr scopes 80 */ 81 #define IPV6_ADDR_MC_SCOPE(a) \ 82 ((a)->s6_addr[1] & 0x0f) /* nonstandard */ 83 #define __IPV6_ADDR_SCOPE_INVALID -1 84 #define IPV6_ADDR_SCOPE_NODELOCAL 0x01 85 #define IPV6_ADDR_SCOPE_LINKLOCAL 0x02 86 #define IPV6_ADDR_SCOPE_SITELOCAL 0x05 87 #define IPV6_ADDR_SCOPE_ORGLOCAL 0x08 88 #define IPV6_ADDR_SCOPE_GLOBAL 0x0e 89 90 /* 91 * Addr flags 92 */ 93 #define IPV6_ADDR_MC_FLAG_TRANSIENT(a) \ 94 ((a)->s6_addr[1] & 0x10) 95 #define IPV6_ADDR_MC_FLAG_PREFIX(a) \ 96 ((a)->s6_addr[1] & 0x20) 97 #define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \ 98 ((a)->s6_addr[1] & 0x40) 99 100 /* 101 * fragmentation header 102 */ 103 104 struct frag_hdr { 105 __u8 nexthdr; 106 __u8 reserved; 107 __be16 frag_off; 108 __be32 identification; 109 }; 110 111 #define IP6_MF 0x0001 112 113 #include <net/sock.h> 114 115 /* sysctls */ 116 extern int sysctl_mld_max_msf; 117 118 #define _DEVINC(net, statname, modifier, idev, field) \ 119 ({ \ 120 struct inet6_dev *_idev = (idev); \ 121 if (likely(_idev != NULL)) \ 122 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \ 123 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\ 124 }) 125 126 /* per device counters are atomic_long_t */ 127 #define _DEVINCATOMIC(net, statname, modifier, idev, field) \ 128 ({ \ 129 struct inet6_dev *_idev = (idev); \ 130 if (likely(_idev != NULL)) \ 131 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \ 132 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\ 133 }) 134 135 /* per device and per net counters are atomic_long_t */ 136 #define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \ 137 ({ \ 138 struct inet6_dev *_idev = (idev); \ 139 if (likely(_idev != NULL)) \ 140 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \ 141 SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\ 142 }) 143 144 #define _DEVADD(net, statname, modifier, idev, field, val) \ 145 ({ \ 146 struct inet6_dev *_idev = (idev); \ 147 if (likely(_idev != NULL)) \ 148 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \ 149 SNMP_ADD_STATS##modifier((net)->mib.statname##_statistics, (field), (val));\ 150 }) 151 152 #define _DEVUPD(net, statname, modifier, idev, field, val) \ 153 ({ \ 154 struct inet6_dev *_idev = (idev); \ 155 if (likely(_idev != NULL)) \ 156 SNMP_UPD_PO_STATS##modifier((_idev)->stats.statname, field, (val)); \ 157 SNMP_UPD_PO_STATS##modifier((net)->mib.statname##_statistics, field, (val));\ 158 }) 159 160 /* MIBs */ 161 162 #define IP6_INC_STATS(net, idev,field) \ 163 _DEVINC(net, ipv6, 64, idev, field) 164 #define IP6_INC_STATS_BH(net, idev,field) \ 165 _DEVINC(net, ipv6, 64_BH, idev, field) 166 #define IP6_ADD_STATS(net, idev,field,val) \ 167 _DEVADD(net, ipv6, 64, idev, field, val) 168 #define IP6_ADD_STATS_BH(net, idev,field,val) \ 169 _DEVADD(net, ipv6, 64_BH, idev, field, val) 170 #define IP6_UPD_PO_STATS(net, idev,field,val) \ 171 _DEVUPD(net, ipv6, 64, idev, field, val) 172 #define IP6_UPD_PO_STATS_BH(net, idev,field,val) \ 173 _DEVUPD(net, ipv6, 64_BH, idev, field, val) 174 #define ICMP6_INC_STATS(net, idev, field) \ 175 _DEVINCATOMIC(net, icmpv6, , idev, field) 176 #define ICMP6_INC_STATS_BH(net, idev, field) \ 177 _DEVINCATOMIC(net, icmpv6, _BH, idev, field) 178 179 #define ICMP6MSGOUT_INC_STATS(net, idev, field) \ 180 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256) 181 #define ICMP6MSGOUT_INC_STATS_BH(net, idev, field) \ 182 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256) 183 #define ICMP6MSGIN_INC_STATS_BH(net, idev, field) \ 184 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field) 185 186 struct ip6_ra_chain { 187 struct ip6_ra_chain *next; 188 struct sock *sk; 189 int sel; 190 void (*destructor)(struct sock *); 191 }; 192 193 extern struct ip6_ra_chain *ip6_ra_chain; 194 extern rwlock_t ip6_ra_lock; 195 196 /* 197 This structure is prepared by protocol, when parsing 198 ancillary data and passed to IPv6. 199 */ 200 201 struct ipv6_txoptions { 202 /* Length of this structure */ 203 int tot_len; 204 205 /* length of extension headers */ 206 207 __u16 opt_flen; /* after fragment hdr */ 208 __u16 opt_nflen; /* before fragment hdr */ 209 210 struct ipv6_opt_hdr *hopopt; 211 struct ipv6_opt_hdr *dst0opt; 212 struct ipv6_rt_hdr *srcrt; /* Routing Header */ 213 struct ipv6_opt_hdr *dst1opt; 214 215 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */ 216 }; 217 218 struct ip6_flowlabel { 219 struct ip6_flowlabel *next; 220 __be32 label; 221 atomic_t users; 222 struct in6_addr dst; 223 struct ipv6_txoptions *opt; 224 unsigned long linger; 225 struct rcu_head rcu; 226 u8 share; 227 union { 228 struct pid *pid; 229 kuid_t uid; 230 } owner; 231 unsigned long lastuse; 232 unsigned long expires; 233 struct net *fl_net; 234 }; 235 236 #define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF) 237 #define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF) 238 239 struct ipv6_fl_socklist { 240 struct ipv6_fl_socklist *next; 241 struct ip6_flowlabel *fl; 242 struct rcu_head rcu; 243 }; 244 245 extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label); 246 extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space, 247 struct ip6_flowlabel * fl, 248 struct ipv6_txoptions * fopt); 249 extern void fl6_free_socklist(struct sock *sk); 250 extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen); 251 extern int ip6_flowlabel_init(void); 252 extern void ip6_flowlabel_cleanup(void); 253 254 static inline void fl6_sock_release(struct ip6_flowlabel *fl) 255 { 256 if (fl) 257 atomic_dec(&fl->users); 258 } 259 260 extern void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info); 261 262 extern int ip6_ra_control(struct sock *sk, int sel); 263 264 extern int ipv6_parse_hopopts(struct sk_buff *skb); 265 266 extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt); 267 extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt, 268 int newtype, 269 struct ipv6_opt_hdr __user *newopt, 270 int newoptlen); 271 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space, 272 struct ipv6_txoptions *opt); 273 274 extern bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb); 275 276 static inline bool ipv6_accept_ra(struct inet6_dev *idev) 277 { 278 /* If forwarding is enabled, RA are not accepted unless the special 279 * hybrid mode (accept_ra=2) is enabled. 280 */ 281 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 : 282 idev->cnf.accept_ra; 283 } 284 285 #if IS_ENABLED(CONFIG_IPV6) 286 static inline int ip6_frag_nqueues(struct net *net) 287 { 288 return net->ipv6.frags.nqueues; 289 } 290 291 static inline int ip6_frag_mem(struct net *net) 292 { 293 return sum_frag_mem_limit(&net->ipv6.frags); 294 } 295 #endif 296 297 #define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */ 298 #define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */ 299 #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */ 300 301 extern int __ipv6_addr_type(const struct in6_addr *addr); 302 static inline int ipv6_addr_type(const struct in6_addr *addr) 303 { 304 return __ipv6_addr_type(addr) & 0xffff; 305 } 306 307 static inline int ipv6_addr_scope(const struct in6_addr *addr) 308 { 309 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK; 310 } 311 312 static inline int __ipv6_addr_src_scope(int type) 313 { 314 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16); 315 } 316 317 static inline int ipv6_addr_src_scope(const struct in6_addr *addr) 318 { 319 return __ipv6_addr_src_scope(__ipv6_addr_type(addr)); 320 } 321 322 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2) 323 { 324 return memcmp(a1, a2, sizeof(struct in6_addr)); 325 } 326 327 static inline bool 328 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m, 329 const struct in6_addr *a2) 330 { 331 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 332 const unsigned long *ul1 = (const unsigned long *)a1; 333 const unsigned long *ulm = (const unsigned long *)m; 334 const unsigned long *ul2 = (const unsigned long *)a2; 335 336 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) | 337 ((ul1[1] ^ ul2[1]) & ulm[1])); 338 #else 339 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) | 340 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) | 341 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) | 342 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3])); 343 #endif 344 } 345 346 static inline void ipv6_addr_prefix(struct in6_addr *pfx, 347 const struct in6_addr *addr, 348 int plen) 349 { 350 /* caller must guarantee 0 <= plen <= 128 */ 351 int o = plen >> 3, 352 b = plen & 0x7; 353 354 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr)); 355 memcpy(pfx->s6_addr, addr, o); 356 if (b != 0) 357 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b); 358 } 359 360 static inline void __ipv6_addr_set_half(__be32 *addr, 361 __be32 wh, __be32 wl) 362 { 363 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 364 #if defined(__BIG_ENDIAN) 365 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) { 366 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl)); 367 return; 368 } 369 #elif defined(__LITTLE_ENDIAN) 370 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) { 371 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh)); 372 return; 373 } 374 #endif 375 #endif 376 addr[0] = wh; 377 addr[1] = wl; 378 } 379 380 static inline void ipv6_addr_set(struct in6_addr *addr, 381 __be32 w1, __be32 w2, 382 __be32 w3, __be32 w4) 383 { 384 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2); 385 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4); 386 } 387 388 static inline bool ipv6_addr_equal(const struct in6_addr *a1, 389 const struct in6_addr *a2) 390 { 391 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 392 const unsigned long *ul1 = (const unsigned long *)a1; 393 const unsigned long *ul2 = (const unsigned long *)a2; 394 395 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL; 396 #else 397 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) | 398 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) | 399 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) | 400 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0; 401 #endif 402 } 403 404 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 405 static inline bool __ipv6_prefix_equal64_half(const __be64 *a1, 406 const __be64 *a2, 407 unsigned int len) 408 { 409 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len)))) 410 return false; 411 return true; 412 } 413 414 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1, 415 const struct in6_addr *addr2, 416 unsigned int prefixlen) 417 { 418 const __be64 *a1 = (const __be64 *)addr1; 419 const __be64 *a2 = (const __be64 *)addr2; 420 421 if (prefixlen >= 64) { 422 if (a1[0] ^ a2[0]) 423 return false; 424 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64); 425 } 426 return __ipv6_prefix_equal64_half(a1, a2, prefixlen); 427 } 428 #else 429 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1, 430 const struct in6_addr *addr2, 431 unsigned int prefixlen) 432 { 433 const __be32 *a1 = addr1->s6_addr32; 434 const __be32 *a2 = addr2->s6_addr32; 435 unsigned int pdw, pbi; 436 437 /* check complete u32 in prefix */ 438 pdw = prefixlen >> 5; 439 if (pdw && memcmp(a1, a2, pdw << 2)) 440 return false; 441 442 /* check incomplete u32 in prefix */ 443 pbi = prefixlen & 0x1f; 444 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi)))) 445 return false; 446 447 return true; 448 } 449 #endif 450 451 struct inet_frag_queue; 452 453 enum ip6_defrag_users { 454 IP6_DEFRAG_LOCAL_DELIVER, 455 IP6_DEFRAG_CONNTRACK_IN, 456 __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX, 457 IP6_DEFRAG_CONNTRACK_OUT, 458 __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX, 459 IP6_DEFRAG_CONNTRACK_BRIDGE_IN, 460 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX, 461 }; 462 463 struct ip6_create_arg { 464 __be32 id; 465 u32 user; 466 const struct in6_addr *src; 467 const struct in6_addr *dst; 468 }; 469 470 void ip6_frag_init(struct inet_frag_queue *q, void *a); 471 bool ip6_frag_match(struct inet_frag_queue *q, void *a); 472 473 /* 474 * Equivalent of ipv4 struct ip 475 */ 476 struct frag_queue { 477 struct inet_frag_queue q; 478 479 __be32 id; /* fragment id */ 480 u32 user; 481 struct in6_addr saddr; 482 struct in6_addr daddr; 483 484 int iif; 485 unsigned int csum; 486 __u16 nhoffset; 487 }; 488 489 void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq, 490 struct inet_frags *frags); 491 492 static inline bool ipv6_addr_any(const struct in6_addr *a) 493 { 494 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 495 const unsigned long *ul = (const unsigned long *)a; 496 497 return (ul[0] | ul[1]) == 0UL; 498 #else 499 return (a->s6_addr32[0] | a->s6_addr32[1] | 500 a->s6_addr32[2] | a->s6_addr32[3]) == 0; 501 #endif 502 } 503 504 static inline u32 ipv6_addr_hash(const struct in6_addr *a) 505 { 506 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 507 const unsigned long *ul = (const unsigned long *)a; 508 unsigned long x = ul[0] ^ ul[1]; 509 510 return (u32)(x ^ (x >> 32)); 511 #else 512 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^ 513 a->s6_addr32[2] ^ a->s6_addr32[3]); 514 #endif 515 } 516 517 static inline bool ipv6_addr_loopback(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] ^ cpu_to_be64(1))) == 0UL; 523 #else 524 return (a->s6_addr32[0] | a->s6_addr32[1] | 525 a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0; 526 #endif 527 } 528 529 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a) 530 { 531 return ( 532 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 533 *(__be64 *)a | 534 #else 535 (a->s6_addr32[0] | a->s6_addr32[1]) | 536 #endif 537 (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0UL; 538 } 539 540 /* 541 * Check for a RFC 4843 ORCHID address 542 * (Overlay Routable Cryptographic Hash Identifiers) 543 */ 544 static inline bool ipv6_addr_orchid(const struct in6_addr *a) 545 { 546 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010); 547 } 548 549 static inline void ipv6_addr_set_v4mapped(const __be32 addr, 550 struct in6_addr *v4mapped) 551 { 552 ipv6_addr_set(v4mapped, 553 0, 0, 554 htonl(0x0000FFFF), 555 addr); 556 } 557 558 /* 559 * find the first different bit between two addresses 560 * length of address must be a multiple of 32bits 561 */ 562 static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen) 563 { 564 const __be32 *a1 = token1, *a2 = token2; 565 int i; 566 567 addrlen >>= 2; 568 569 for (i = 0; i < addrlen; i++) { 570 __be32 xb = a1[i] ^ a2[i]; 571 if (xb) 572 return i * 32 + 31 - __fls(ntohl(xb)); 573 } 574 575 /* 576 * we should *never* get to this point since that 577 * would mean the addrs are equal 578 * 579 * However, we do get to it 8) And exacly, when 580 * addresses are equal 8) 581 * 582 * ip route add 1111::/128 via ... 583 * ip route add 1111::/64 via ... 584 * and we are here. 585 * 586 * Ideally, this function should stop comparison 587 * at prefix length. It does not, but it is still OK, 588 * if returned value is greater than prefix length. 589 * --ANK (980803) 590 */ 591 return addrlen << 5; 592 } 593 594 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 595 static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen) 596 { 597 const __be64 *a1 = token1, *a2 = token2; 598 int i; 599 600 addrlen >>= 3; 601 602 for (i = 0; i < addrlen; i++) { 603 __be64 xb = a1[i] ^ a2[i]; 604 if (xb) 605 return i * 64 + 63 - __fls(be64_to_cpu(xb)); 606 } 607 608 return addrlen << 6; 609 } 610 #endif 611 612 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen) 613 { 614 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 615 if (__builtin_constant_p(addrlen) && !(addrlen & 7)) 616 return __ipv6_addr_diff64(token1, token2, addrlen); 617 #endif 618 return __ipv6_addr_diff32(token1, token2, addrlen); 619 } 620 621 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2) 622 { 623 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr)); 624 } 625 626 extern void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt); 627 628 /* 629 * Header manipulation 630 */ 631 static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass, 632 __be32 flowlabel) 633 { 634 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel; 635 } 636 637 static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr) 638 { 639 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK; 640 } 641 642 /* 643 * Prototypes exported by ipv6 644 */ 645 646 /* 647 * rcv function (called from netdevice level) 648 */ 649 650 extern int ipv6_rcv(struct sk_buff *skb, 651 struct net_device *dev, 652 struct packet_type *pt, 653 struct net_device *orig_dev); 654 655 extern int ip6_rcv_finish(struct sk_buff *skb); 656 657 /* 658 * upper-layer output functions 659 */ 660 extern int ip6_xmit(struct sock *sk, 661 struct sk_buff *skb, 662 struct flowi6 *fl6, 663 struct ipv6_txoptions *opt, 664 int tclass); 665 666 extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr); 667 668 extern int ip6_append_data(struct sock *sk, 669 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb), 670 void *from, 671 int length, 672 int transhdrlen, 673 int hlimit, 674 int tclass, 675 struct ipv6_txoptions *opt, 676 struct flowi6 *fl6, 677 struct rt6_info *rt, 678 unsigned int flags, 679 int dontfrag); 680 681 extern int ip6_push_pending_frames(struct sock *sk); 682 683 extern void ip6_flush_pending_frames(struct sock *sk); 684 685 extern int ip6_dst_lookup(struct sock *sk, 686 struct dst_entry **dst, 687 struct flowi6 *fl6); 688 extern struct dst_entry * ip6_dst_lookup_flow(struct sock *sk, 689 struct flowi6 *fl6, 690 const struct in6_addr *final_dst, 691 bool can_sleep); 692 extern struct dst_entry * ip6_sk_dst_lookup_flow(struct sock *sk, 693 struct flowi6 *fl6, 694 const struct in6_addr *final_dst, 695 bool can_sleep); 696 extern struct dst_entry * ip6_blackhole_route(struct net *net, 697 struct dst_entry *orig_dst); 698 699 /* 700 * skb processing functions 701 */ 702 703 extern int ip6_output(struct sk_buff *skb); 704 extern int ip6_forward(struct sk_buff *skb); 705 extern int ip6_input(struct sk_buff *skb); 706 extern int ip6_mc_input(struct sk_buff *skb); 707 708 extern int __ip6_local_out(struct sk_buff *skb); 709 extern int ip6_local_out(struct sk_buff *skb); 710 711 /* 712 * Extension header (options) processing 713 */ 714 715 extern void ipv6_push_nfrag_opts(struct sk_buff *skb, 716 struct ipv6_txoptions *opt, 717 u8 *proto, 718 struct in6_addr **daddr_p); 719 extern void ipv6_push_frag_opts(struct sk_buff *skb, 720 struct ipv6_txoptions *opt, 721 u8 *proto); 722 723 extern int ipv6_skip_exthdr(const struct sk_buff *, int start, 724 u8 *nexthdrp, __be16 *frag_offp); 725 726 extern bool ipv6_ext_hdr(u8 nexthdr); 727 728 enum { 729 IP6_FH_F_FRAG = (1 << 0), 730 IP6_FH_F_AUTH = (1 << 1), 731 IP6_FH_F_SKIP_RH = (1 << 2), 732 }; 733 734 /* find specified header and get offset to it */ 735 extern int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, 736 int target, unsigned short *fragoff, int *fragflg); 737 738 extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type); 739 740 extern struct in6_addr *fl6_update_dst(struct flowi6 *fl6, 741 const struct ipv6_txoptions *opt, 742 struct in6_addr *orig); 743 744 /* 745 * socket options (ipv6_sockglue.c) 746 */ 747 748 extern int ipv6_setsockopt(struct sock *sk, int level, 749 int optname, 750 char __user *optval, 751 unsigned int optlen); 752 extern int ipv6_getsockopt(struct sock *sk, int level, 753 int optname, 754 char __user *optval, 755 int __user *optlen); 756 extern int compat_ipv6_setsockopt(struct sock *sk, 757 int level, 758 int optname, 759 char __user *optval, 760 unsigned int optlen); 761 extern int compat_ipv6_getsockopt(struct sock *sk, 762 int level, 763 int optname, 764 char __user *optval, 765 int __user *optlen); 766 767 extern int ip6_datagram_connect(struct sock *sk, 768 struct sockaddr *addr, int addr_len); 769 770 extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len); 771 extern int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len); 772 extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, 773 u32 info, u8 *payload); 774 extern void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info); 775 extern void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu); 776 777 extern int inet6_release(struct socket *sock); 778 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr, 779 int addr_len); 780 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 781 int *uaddr_len, int peer); 782 extern int inet6_ioctl(struct socket *sock, unsigned int cmd, 783 unsigned long arg); 784 785 extern int inet6_hash_connect(struct inet_timewait_death_row *death_row, 786 struct sock *sk); 787 788 /* 789 * reassembly.c 790 */ 791 extern const struct proto_ops inet6_stream_ops; 792 extern const struct proto_ops inet6_dgram_ops; 793 794 struct group_source_req; 795 struct group_filter; 796 797 extern int ip6_mc_source(int add, int omode, struct sock *sk, 798 struct group_source_req *pgsr); 799 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf); 800 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 801 struct group_filter __user *optval, 802 int __user *optlen); 803 extern unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr, 804 const struct in6_addr *daddr, u32 rnd); 805 806 #ifdef CONFIG_PROC_FS 807 extern int ac6_proc_init(struct net *net); 808 extern void ac6_proc_exit(struct net *net); 809 extern int raw6_proc_init(void); 810 extern void raw6_proc_exit(void); 811 extern int tcp6_proc_init(struct net *net); 812 extern void tcp6_proc_exit(struct net *net); 813 extern int udp6_proc_init(struct net *net); 814 extern void udp6_proc_exit(struct net *net); 815 extern int udplite6_proc_init(void); 816 extern void udplite6_proc_exit(void); 817 extern int ipv6_misc_proc_init(void); 818 extern void ipv6_misc_proc_exit(void); 819 extern int snmp6_register_dev(struct inet6_dev *idev); 820 extern int snmp6_unregister_dev(struct inet6_dev *idev); 821 822 #else 823 static inline int ac6_proc_init(struct net *net) { return 0; } 824 static inline void ac6_proc_exit(struct net *net) { } 825 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; } 826 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; } 827 #endif 828 829 #ifdef CONFIG_SYSCTL 830 extern ctl_table ipv6_route_table_template[]; 831 extern ctl_table ipv6_icmp_table_template[]; 832 833 extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net); 834 extern struct ctl_table *ipv6_route_sysctl_init(struct net *net); 835 extern int ipv6_sysctl_register(void); 836 extern void ipv6_sysctl_unregister(void); 837 #endif 838 839 #endif /* _NET_IPV6_H */ 840