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 #define IP6_REPLY_MARK(net, mark) \ 117 ((net)->ipv6.sysctl.fwmark_reflect ? (mark) : 0) 118 119 #include <net/sock.h> 120 121 /* sysctls */ 122 extern int sysctl_mld_max_msf; 123 124 #define _DEVINC(net, statname, modifier, idev, field) \ 125 ({ \ 126 struct inet6_dev *_idev = (idev); \ 127 if (likely(_idev != NULL)) \ 128 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \ 129 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\ 130 }) 131 132 /* per device counters are atomic_long_t */ 133 #define _DEVINCATOMIC(net, statname, modifier, idev, field) \ 134 ({ \ 135 struct inet6_dev *_idev = (idev); \ 136 if (likely(_idev != NULL)) \ 137 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \ 138 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\ 139 }) 140 141 /* per device and per net counters are atomic_long_t */ 142 #define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \ 143 ({ \ 144 struct inet6_dev *_idev = (idev); \ 145 if (likely(_idev != NULL)) \ 146 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \ 147 SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\ 148 }) 149 150 #define _DEVADD(net, statname, modifier, idev, field, val) \ 151 ({ \ 152 struct inet6_dev *_idev = (idev); \ 153 if (likely(_idev != NULL)) \ 154 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \ 155 SNMP_ADD_STATS##modifier((net)->mib.statname##_statistics, (field), (val));\ 156 }) 157 158 #define _DEVUPD(net, statname, modifier, idev, field, val) \ 159 ({ \ 160 struct inet6_dev *_idev = (idev); \ 161 if (likely(_idev != NULL)) \ 162 SNMP_UPD_PO_STATS##modifier((_idev)->stats.statname, field, (val)); \ 163 SNMP_UPD_PO_STATS##modifier((net)->mib.statname##_statistics, field, (val));\ 164 }) 165 166 /* MIBs */ 167 168 #define IP6_INC_STATS(net, idev,field) \ 169 _DEVINC(net, ipv6, 64, idev, field) 170 #define IP6_INC_STATS_BH(net, idev,field) \ 171 _DEVINC(net, ipv6, 64_BH, idev, field) 172 #define IP6_ADD_STATS(net, idev,field,val) \ 173 _DEVADD(net, ipv6, 64, idev, field, val) 174 #define IP6_ADD_STATS_BH(net, idev,field,val) \ 175 _DEVADD(net, ipv6, 64_BH, idev, field, val) 176 #define IP6_UPD_PO_STATS(net, idev,field,val) \ 177 _DEVUPD(net, ipv6, 64, idev, field, val) 178 #define IP6_UPD_PO_STATS_BH(net, idev,field,val) \ 179 _DEVUPD(net, ipv6, 64_BH, idev, field, val) 180 #define ICMP6_INC_STATS(net, idev, field) \ 181 _DEVINCATOMIC(net, icmpv6, , idev, field) 182 #define ICMP6_INC_STATS_BH(net, idev, field) \ 183 _DEVINCATOMIC(net, icmpv6, _BH, idev, field) 184 185 #define ICMP6MSGOUT_INC_STATS(net, idev, field) \ 186 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256) 187 #define ICMP6MSGOUT_INC_STATS_BH(net, idev, field) \ 188 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256) 189 #define ICMP6MSGIN_INC_STATS_BH(net, idev, field) \ 190 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field) 191 192 struct ip6_ra_chain { 193 struct ip6_ra_chain *next; 194 struct sock *sk; 195 int sel; 196 void (*destructor)(struct sock *); 197 }; 198 199 extern struct ip6_ra_chain *ip6_ra_chain; 200 extern rwlock_t ip6_ra_lock; 201 202 /* 203 This structure is prepared by protocol, when parsing 204 ancillary data and passed to IPv6. 205 */ 206 207 struct ipv6_txoptions { 208 /* Length of this structure */ 209 int tot_len; 210 211 /* length of extension headers */ 212 213 __u16 opt_flen; /* after fragment hdr */ 214 __u16 opt_nflen; /* before fragment hdr */ 215 216 struct ipv6_opt_hdr *hopopt; 217 struct ipv6_opt_hdr *dst0opt; 218 struct ipv6_rt_hdr *srcrt; /* Routing Header */ 219 struct ipv6_opt_hdr *dst1opt; 220 221 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */ 222 }; 223 224 struct ip6_flowlabel { 225 struct ip6_flowlabel __rcu *next; 226 __be32 label; 227 atomic_t users; 228 struct in6_addr dst; 229 struct ipv6_txoptions *opt; 230 unsigned long linger; 231 struct rcu_head rcu; 232 u8 share; 233 union { 234 struct pid *pid; 235 kuid_t uid; 236 } owner; 237 unsigned long lastuse; 238 unsigned long expires; 239 struct net *fl_net; 240 }; 241 242 #define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF) 243 #define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF) 244 #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK) 245 #define IPV6_TCLASS_SHIFT 20 246 247 struct ipv6_fl_socklist { 248 struct ipv6_fl_socklist __rcu *next; 249 struct ip6_flowlabel *fl; 250 struct rcu_head rcu; 251 }; 252 253 struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label); 254 struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space, 255 struct ip6_flowlabel *fl, 256 struct ipv6_txoptions *fopt); 257 void fl6_free_socklist(struct sock *sk); 258 int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen); 259 int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq, 260 int flags); 261 int ip6_flowlabel_init(void); 262 void ip6_flowlabel_cleanup(void); 263 264 static inline void fl6_sock_release(struct ip6_flowlabel *fl) 265 { 266 if (fl) 267 atomic_dec(&fl->users); 268 } 269 270 void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info); 271 272 int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, 273 struct icmp6hdr *thdr, int len); 274 275 int ip6_ra_control(struct sock *sk, int sel); 276 277 int ipv6_parse_hopopts(struct sk_buff *skb); 278 279 struct ipv6_txoptions *ipv6_dup_options(struct sock *sk, 280 struct ipv6_txoptions *opt); 281 struct ipv6_txoptions *ipv6_renew_options(struct sock *sk, 282 struct ipv6_txoptions *opt, 283 int newtype, 284 struct ipv6_opt_hdr __user *newopt, 285 int newoptlen); 286 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space, 287 struct ipv6_txoptions *opt); 288 289 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb); 290 291 static inline bool ipv6_accept_ra(struct inet6_dev *idev) 292 { 293 /* If forwarding is enabled, RA are not accepted unless the special 294 * hybrid mode (accept_ra=2) is enabled. 295 */ 296 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 : 297 idev->cnf.accept_ra; 298 } 299 300 #if IS_ENABLED(CONFIG_IPV6) 301 static inline int ip6_frag_nqueues(struct net *net) 302 { 303 return net->ipv6.frags.nqueues; 304 } 305 306 static inline int ip6_frag_mem(struct net *net) 307 { 308 return sum_frag_mem_limit(&net->ipv6.frags); 309 } 310 #endif 311 312 #define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */ 313 #define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */ 314 #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */ 315 316 int __ipv6_addr_type(const struct in6_addr *addr); 317 static inline int ipv6_addr_type(const struct in6_addr *addr) 318 { 319 return __ipv6_addr_type(addr) & 0xffff; 320 } 321 322 static inline int ipv6_addr_scope(const struct in6_addr *addr) 323 { 324 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK; 325 } 326 327 static inline int __ipv6_addr_src_scope(int type) 328 { 329 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16); 330 } 331 332 static inline int ipv6_addr_src_scope(const struct in6_addr *addr) 333 { 334 return __ipv6_addr_src_scope(__ipv6_addr_type(addr)); 335 } 336 337 static inline bool __ipv6_addr_needs_scope_id(int type) 338 { 339 return type & IPV6_ADDR_LINKLOCAL || 340 (type & IPV6_ADDR_MULTICAST && 341 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL))); 342 } 343 344 static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface) 345 { 346 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0; 347 } 348 349 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2) 350 { 351 return memcmp(a1, a2, sizeof(struct in6_addr)); 352 } 353 354 static inline bool 355 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m, 356 const struct in6_addr *a2) 357 { 358 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 359 const unsigned long *ul1 = (const unsigned long *)a1; 360 const unsigned long *ulm = (const unsigned long *)m; 361 const unsigned long *ul2 = (const unsigned long *)a2; 362 363 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) | 364 ((ul1[1] ^ ul2[1]) & ulm[1])); 365 #else 366 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) | 367 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) | 368 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) | 369 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3])); 370 #endif 371 } 372 373 static inline void ipv6_addr_prefix(struct in6_addr *pfx, 374 const struct in6_addr *addr, 375 int plen) 376 { 377 /* caller must guarantee 0 <= plen <= 128 */ 378 int o = plen >> 3, 379 b = plen & 0x7; 380 381 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr)); 382 memcpy(pfx->s6_addr, addr, o); 383 if (b != 0) 384 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b); 385 } 386 387 static inline void __ipv6_addr_set_half(__be32 *addr, 388 __be32 wh, __be32 wl) 389 { 390 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 391 #if defined(__BIG_ENDIAN) 392 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) { 393 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl)); 394 return; 395 } 396 #elif defined(__LITTLE_ENDIAN) 397 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) { 398 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh)); 399 return; 400 } 401 #endif 402 #endif 403 addr[0] = wh; 404 addr[1] = wl; 405 } 406 407 static inline void ipv6_addr_set(struct in6_addr *addr, 408 __be32 w1, __be32 w2, 409 __be32 w3, __be32 w4) 410 { 411 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2); 412 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4); 413 } 414 415 static inline bool ipv6_addr_equal(const struct in6_addr *a1, 416 const struct in6_addr *a2) 417 { 418 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 419 const unsigned long *ul1 = (const unsigned long *)a1; 420 const unsigned long *ul2 = (const unsigned long *)a2; 421 422 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL; 423 #else 424 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) | 425 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) | 426 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) | 427 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0; 428 #endif 429 } 430 431 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 432 static inline bool __ipv6_prefix_equal64_half(const __be64 *a1, 433 const __be64 *a2, 434 unsigned int len) 435 { 436 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len)))) 437 return false; 438 return true; 439 } 440 441 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1, 442 const struct in6_addr *addr2, 443 unsigned int prefixlen) 444 { 445 const __be64 *a1 = (const __be64 *)addr1; 446 const __be64 *a2 = (const __be64 *)addr2; 447 448 if (prefixlen >= 64) { 449 if (a1[0] ^ a2[0]) 450 return false; 451 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64); 452 } 453 return __ipv6_prefix_equal64_half(a1, a2, prefixlen); 454 } 455 #else 456 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1, 457 const struct in6_addr *addr2, 458 unsigned int prefixlen) 459 { 460 const __be32 *a1 = addr1->s6_addr32; 461 const __be32 *a2 = addr2->s6_addr32; 462 unsigned int pdw, pbi; 463 464 /* check complete u32 in prefix */ 465 pdw = prefixlen >> 5; 466 if (pdw && memcmp(a1, a2, pdw << 2)) 467 return false; 468 469 /* check incomplete u32 in prefix */ 470 pbi = prefixlen & 0x1f; 471 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi)))) 472 return false; 473 474 return true; 475 } 476 #endif 477 478 struct inet_frag_queue; 479 480 enum ip6_defrag_users { 481 IP6_DEFRAG_LOCAL_DELIVER, 482 IP6_DEFRAG_CONNTRACK_IN, 483 __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX, 484 IP6_DEFRAG_CONNTRACK_OUT, 485 __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX, 486 IP6_DEFRAG_CONNTRACK_BRIDGE_IN, 487 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX, 488 }; 489 490 struct ip6_create_arg { 491 __be32 id; 492 u32 user; 493 const struct in6_addr *src; 494 const struct in6_addr *dst; 495 u8 ecn; 496 }; 497 498 void ip6_frag_init(struct inet_frag_queue *q, void *a); 499 bool ip6_frag_match(struct inet_frag_queue *q, void *a); 500 501 /* 502 * Equivalent of ipv4 struct ip 503 */ 504 struct frag_queue { 505 struct inet_frag_queue q; 506 507 __be32 id; /* fragment id */ 508 u32 user; 509 struct in6_addr saddr; 510 struct in6_addr daddr; 511 512 int iif; 513 unsigned int csum; 514 __u16 nhoffset; 515 u8 ecn; 516 }; 517 518 void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq, 519 struct inet_frags *frags); 520 521 static inline bool ipv6_addr_any(const struct in6_addr *a) 522 { 523 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 524 const unsigned long *ul = (const unsigned long *)a; 525 526 return (ul[0] | ul[1]) == 0UL; 527 #else 528 return (a->s6_addr32[0] | a->s6_addr32[1] | 529 a->s6_addr32[2] | a->s6_addr32[3]) == 0; 530 #endif 531 } 532 533 static inline u32 ipv6_addr_hash(const struct in6_addr *a) 534 { 535 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 536 const unsigned long *ul = (const unsigned long *)a; 537 unsigned long x = ul[0] ^ ul[1]; 538 539 return (u32)(x ^ (x >> 32)); 540 #else 541 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^ 542 a->s6_addr32[2] ^ a->s6_addr32[3]); 543 #endif 544 } 545 546 /* more secured version of ipv6_addr_hash() */ 547 static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval) 548 { 549 u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1]; 550 551 return jhash_3words(v, 552 (__force u32)a->s6_addr32[2], 553 (__force u32)a->s6_addr32[3], 554 initval); 555 } 556 557 static inline bool ipv6_addr_loopback(const struct in6_addr *a) 558 { 559 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 560 const unsigned long *ul = (const unsigned long *)a; 561 562 return (ul[0] | (ul[1] ^ cpu_to_be64(1))) == 0UL; 563 #else 564 return (a->s6_addr32[0] | a->s6_addr32[1] | 565 a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0; 566 #endif 567 } 568 569 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a) 570 { 571 return ( 572 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 573 *(__be64 *)a | 574 #else 575 (a->s6_addr32[0] | a->s6_addr32[1]) | 576 #endif 577 (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0UL; 578 } 579 580 /* 581 * Check for a RFC 4843 ORCHID address 582 * (Overlay Routable Cryptographic Hash Identifiers) 583 */ 584 static inline bool ipv6_addr_orchid(const struct in6_addr *a) 585 { 586 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010); 587 } 588 589 static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr) 590 { 591 return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000); 592 } 593 594 static inline void ipv6_addr_set_v4mapped(const __be32 addr, 595 struct in6_addr *v4mapped) 596 { 597 ipv6_addr_set(v4mapped, 598 0, 0, 599 htonl(0x0000FFFF), 600 addr); 601 } 602 603 /* 604 * find the first different bit between two addresses 605 * length of address must be a multiple of 32bits 606 */ 607 static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen) 608 { 609 const __be32 *a1 = token1, *a2 = token2; 610 int i; 611 612 addrlen >>= 2; 613 614 for (i = 0; i < addrlen; i++) { 615 __be32 xb = a1[i] ^ a2[i]; 616 if (xb) 617 return i * 32 + 31 - __fls(ntohl(xb)); 618 } 619 620 /* 621 * we should *never* get to this point since that 622 * would mean the addrs are equal 623 * 624 * However, we do get to it 8) And exacly, when 625 * addresses are equal 8) 626 * 627 * ip route add 1111::/128 via ... 628 * ip route add 1111::/64 via ... 629 * and we are here. 630 * 631 * Ideally, this function should stop comparison 632 * at prefix length. It does not, but it is still OK, 633 * if returned value is greater than prefix length. 634 * --ANK (980803) 635 */ 636 return addrlen << 5; 637 } 638 639 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 640 static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen) 641 { 642 const __be64 *a1 = token1, *a2 = token2; 643 int i; 644 645 addrlen >>= 3; 646 647 for (i = 0; i < addrlen; i++) { 648 __be64 xb = a1[i] ^ a2[i]; 649 if (xb) 650 return i * 64 + 63 - __fls(be64_to_cpu(xb)); 651 } 652 653 return addrlen << 6; 654 } 655 #endif 656 657 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen) 658 { 659 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 660 if (__builtin_constant_p(addrlen) && !(addrlen & 7)) 661 return __ipv6_addr_diff64(token1, token2, addrlen); 662 #endif 663 return __ipv6_addr_diff32(token1, token2, addrlen); 664 } 665 666 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2) 667 { 668 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr)); 669 } 670 671 int ip6_dst_hoplimit(struct dst_entry *dst); 672 673 static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6, 674 struct dst_entry *dst) 675 { 676 int hlimit; 677 678 if (ipv6_addr_is_multicast(&fl6->daddr)) 679 hlimit = np->mcast_hops; 680 else 681 hlimit = np->hop_limit; 682 if (hlimit < 0) 683 hlimit = ip6_dst_hoplimit(dst); 684 return hlimit; 685 } 686 687 /* 688 * Header manipulation 689 */ 690 static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass, 691 __be32 flowlabel) 692 { 693 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel; 694 } 695 696 static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr) 697 { 698 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK; 699 } 700 701 static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr) 702 { 703 return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK; 704 } 705 706 static inline u8 ip6_tclass(__be32 flowinfo) 707 { 708 return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT; 709 } 710 /* 711 * Prototypes exported by ipv6 712 */ 713 714 /* 715 * rcv function (called from netdevice level) 716 */ 717 718 int ipv6_rcv(struct sk_buff *skb, struct net_device *dev, 719 struct packet_type *pt, struct net_device *orig_dev); 720 721 int ip6_rcv_finish(struct sk_buff *skb); 722 723 /* 724 * upper-layer output functions 725 */ 726 int ip6_xmit(struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6, 727 struct ipv6_txoptions *opt, int tclass); 728 729 int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr); 730 731 int ip6_append_data(struct sock *sk, 732 int getfrag(void *from, char *to, int offset, int len, 733 int odd, struct sk_buff *skb), 734 void *from, int length, int transhdrlen, int hlimit, 735 int tclass, struct ipv6_txoptions *opt, struct flowi6 *fl6, 736 struct rt6_info *rt, unsigned int flags, int dontfrag); 737 738 int ip6_push_pending_frames(struct sock *sk); 739 740 void ip6_flush_pending_frames(struct sock *sk); 741 742 int ip6_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi6 *fl6); 743 struct dst_entry *ip6_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6, 744 const struct in6_addr *final_dst); 745 struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6, 746 const struct in6_addr *final_dst); 747 struct dst_entry *ip6_blackhole_route(struct net *net, 748 struct dst_entry *orig_dst); 749 750 /* 751 * skb processing functions 752 */ 753 754 int ip6_output(struct sock *sk, struct sk_buff *skb); 755 int ip6_forward(struct sk_buff *skb); 756 int ip6_input(struct sk_buff *skb); 757 int ip6_mc_input(struct sk_buff *skb); 758 759 int __ip6_local_out(struct sk_buff *skb); 760 int ip6_local_out(struct sk_buff *skb); 761 762 /* 763 * Extension header (options) processing 764 */ 765 766 void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, 767 u8 *proto, struct in6_addr **daddr_p); 768 void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, 769 u8 *proto); 770 771 int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp, 772 __be16 *frag_offp); 773 774 bool ipv6_ext_hdr(u8 nexthdr); 775 776 enum { 777 IP6_FH_F_FRAG = (1 << 0), 778 IP6_FH_F_AUTH = (1 << 1), 779 IP6_FH_F_SKIP_RH = (1 << 2), 780 }; 781 782 /* find specified header and get offset to it */ 783 int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target, 784 unsigned short *fragoff, int *fragflg); 785 786 int ipv6_find_tlv(struct sk_buff *skb, int offset, int type); 787 788 struct in6_addr *fl6_update_dst(struct flowi6 *fl6, 789 const struct ipv6_txoptions *opt, 790 struct in6_addr *orig); 791 792 /* 793 * socket options (ipv6_sockglue.c) 794 */ 795 796 int ipv6_setsockopt(struct sock *sk, int level, int optname, 797 char __user *optval, unsigned int optlen); 798 int ipv6_getsockopt(struct sock *sk, int level, int optname, 799 char __user *optval, int __user *optlen); 800 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname, 801 char __user *optval, unsigned int optlen); 802 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname, 803 char __user *optval, int __user *optlen); 804 805 int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len); 806 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr, 807 int addr_len); 808 809 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, 810 int *addr_len); 811 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len, 812 int *addr_len); 813 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, 814 u32 info, u8 *payload); 815 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info); 816 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu); 817 818 int inet6_release(struct socket *sock); 819 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len); 820 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len, 821 int peer); 822 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg); 823 824 int inet6_hash_connect(struct inet_timewait_death_row *death_row, 825 struct sock *sk); 826 827 /* 828 * reassembly.c 829 */ 830 extern const struct proto_ops inet6_stream_ops; 831 extern const struct proto_ops inet6_dgram_ops; 832 833 struct group_source_req; 834 struct group_filter; 835 836 int ip6_mc_source(int add, int omode, struct sock *sk, 837 struct group_source_req *pgsr); 838 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf); 839 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 840 struct group_filter __user *optval, int __user *optlen); 841 842 #ifdef CONFIG_PROC_FS 843 int ac6_proc_init(struct net *net); 844 void ac6_proc_exit(struct net *net); 845 int raw6_proc_init(void); 846 void raw6_proc_exit(void); 847 int tcp6_proc_init(struct net *net); 848 void tcp6_proc_exit(struct net *net); 849 int udp6_proc_init(struct net *net); 850 void udp6_proc_exit(struct net *net); 851 int udplite6_proc_init(void); 852 void udplite6_proc_exit(void); 853 int ipv6_misc_proc_init(void); 854 void ipv6_misc_proc_exit(void); 855 int snmp6_register_dev(struct inet6_dev *idev); 856 int snmp6_unregister_dev(struct inet6_dev *idev); 857 858 #else 859 static inline int ac6_proc_init(struct net *net) { return 0; } 860 static inline void ac6_proc_exit(struct net *net) { } 861 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; } 862 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; } 863 #endif 864 865 #ifdef CONFIG_SYSCTL 866 extern struct ctl_table ipv6_route_table_template[]; 867 868 struct ctl_table *ipv6_icmp_sysctl_init(struct net *net); 869 struct ctl_table *ipv6_route_sysctl_init(struct net *net); 870 int ipv6_sysctl_register(void); 871 void ipv6_sysctl_unregister(void); 872 #endif 873 874 #endif /* _NET_IPV6_H */ 875