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/flow_dissector.h> 23 #include <net/snmp.h> 24 25 #define SIN6_LEN_RFC2133 24 26 27 #define IPV6_MAXPLEN 65535 28 29 /* 30 * NextHeader field of IPv6 header 31 */ 32 33 #define NEXTHDR_HOP 0 /* Hop-by-hop option header. */ 34 #define NEXTHDR_TCP 6 /* TCP segment. */ 35 #define NEXTHDR_UDP 17 /* UDP message. */ 36 #define NEXTHDR_IPV6 41 /* IPv6 in IPv6 */ 37 #define NEXTHDR_ROUTING 43 /* Routing header. */ 38 #define NEXTHDR_FRAGMENT 44 /* Fragmentation/reassembly header. */ 39 #define NEXTHDR_GRE 47 /* GRE header. */ 40 #define NEXTHDR_ESP 50 /* Encapsulating security payload. */ 41 #define NEXTHDR_AUTH 51 /* Authentication header. */ 42 #define NEXTHDR_ICMP 58 /* ICMP for IPv6. */ 43 #define NEXTHDR_NONE 59 /* No next header */ 44 #define NEXTHDR_DEST 60 /* Destination options header. */ 45 #define NEXTHDR_SCTP 132 /* SCTP message. */ 46 #define NEXTHDR_MOBILITY 135 /* Mobility header. */ 47 48 #define NEXTHDR_MAX 255 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 #define IP6_OFFSET 0xFFF8 114 115 #define IP6_REPLY_MARK(net, mark) \ 116 ((net)->ipv6.sysctl.fwmark_reflect ? (mark) : 0) 117 118 #include <net/sock.h> 119 120 /* sysctls */ 121 extern int sysctl_mld_max_msf; 122 extern int sysctl_mld_qrv; 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 atomic_t refcnt; 209 /* Length of this structure */ 210 int tot_len; 211 212 /* length of extension headers */ 213 214 __u16 opt_flen; /* after fragment hdr */ 215 __u16 opt_nflen; /* before fragment hdr */ 216 217 struct ipv6_opt_hdr *hopopt; 218 struct ipv6_opt_hdr *dst0opt; 219 struct ipv6_rt_hdr *srcrt; /* Routing Header */ 220 struct ipv6_opt_hdr *dst1opt; 221 struct rcu_head rcu; 222 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */ 223 }; 224 225 struct ip6_flowlabel { 226 struct ip6_flowlabel __rcu *next; 227 __be32 label; 228 atomic_t users; 229 struct in6_addr dst; 230 struct ipv6_txoptions *opt; 231 unsigned long linger; 232 struct rcu_head rcu; 233 u8 share; 234 union { 235 struct pid *pid; 236 kuid_t uid; 237 } owner; 238 unsigned long lastuse; 239 unsigned long expires; 240 struct net *fl_net; 241 }; 242 243 #define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF) 244 #define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF) 245 #define IPV6_FLOWLABEL_STATELESS_FLAG cpu_to_be32(0x00080000) 246 247 #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK) 248 #define IPV6_TCLASS_SHIFT 20 249 250 struct ipv6_fl_socklist { 251 struct ipv6_fl_socklist __rcu *next; 252 struct ip6_flowlabel *fl; 253 struct rcu_head rcu; 254 }; 255 256 static inline struct ipv6_txoptions *txopt_get(const struct ipv6_pinfo *np) 257 { 258 struct ipv6_txoptions *opt; 259 260 rcu_read_lock(); 261 opt = rcu_dereference(np->opt); 262 if (opt && !atomic_inc_not_zero(&opt->refcnt)) 263 opt = NULL; 264 rcu_read_unlock(); 265 return opt; 266 } 267 268 static inline void txopt_put(struct ipv6_txoptions *opt) 269 { 270 if (opt && atomic_dec_and_test(&opt->refcnt)) 271 kfree_rcu(opt, rcu); 272 } 273 274 struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label); 275 struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space, 276 struct ip6_flowlabel *fl, 277 struct ipv6_txoptions *fopt); 278 void fl6_free_socklist(struct sock *sk); 279 int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen); 280 int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq, 281 int flags); 282 int ip6_flowlabel_init(void); 283 void ip6_flowlabel_cleanup(void); 284 285 static inline void fl6_sock_release(struct ip6_flowlabel *fl) 286 { 287 if (fl) 288 atomic_dec(&fl->users); 289 } 290 291 void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info); 292 293 int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, 294 struct icmp6hdr *thdr, int len); 295 296 int ip6_ra_control(struct sock *sk, int sel); 297 298 int ipv6_parse_hopopts(struct sk_buff *skb); 299 300 struct ipv6_txoptions *ipv6_dup_options(struct sock *sk, 301 struct ipv6_txoptions *opt); 302 struct ipv6_txoptions *ipv6_renew_options(struct sock *sk, 303 struct ipv6_txoptions *opt, 304 int newtype, 305 struct ipv6_opt_hdr __user *newopt, 306 int newoptlen); 307 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space, 308 struct ipv6_txoptions *opt); 309 310 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb, 311 const struct inet6_skb_parm *opt); 312 313 static inline bool ipv6_accept_ra(struct inet6_dev *idev) 314 { 315 /* If forwarding is enabled, RA are not accepted unless the special 316 * hybrid mode (accept_ra=2) is enabled. 317 */ 318 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 : 319 idev->cnf.accept_ra; 320 } 321 322 #if IS_ENABLED(CONFIG_IPV6) 323 static inline int ip6_frag_mem(struct net *net) 324 { 325 return sum_frag_mem_limit(&net->ipv6.frags); 326 } 327 #endif 328 329 #define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */ 330 #define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */ 331 #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */ 332 333 int __ipv6_addr_type(const struct in6_addr *addr); 334 static inline int ipv6_addr_type(const struct in6_addr *addr) 335 { 336 return __ipv6_addr_type(addr) & 0xffff; 337 } 338 339 static inline int ipv6_addr_scope(const struct in6_addr *addr) 340 { 341 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK; 342 } 343 344 static inline int __ipv6_addr_src_scope(int type) 345 { 346 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16); 347 } 348 349 static inline int ipv6_addr_src_scope(const struct in6_addr *addr) 350 { 351 return __ipv6_addr_src_scope(__ipv6_addr_type(addr)); 352 } 353 354 static inline bool __ipv6_addr_needs_scope_id(int type) 355 { 356 return type & IPV6_ADDR_LINKLOCAL || 357 (type & IPV6_ADDR_MULTICAST && 358 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL))); 359 } 360 361 static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface) 362 { 363 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0; 364 } 365 366 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2) 367 { 368 return memcmp(a1, a2, sizeof(struct in6_addr)); 369 } 370 371 static inline bool 372 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m, 373 const struct in6_addr *a2) 374 { 375 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 376 const unsigned long *ul1 = (const unsigned long *)a1; 377 const unsigned long *ulm = (const unsigned long *)m; 378 const unsigned long *ul2 = (const unsigned long *)a2; 379 380 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) | 381 ((ul1[1] ^ ul2[1]) & ulm[1])); 382 #else 383 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) | 384 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) | 385 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) | 386 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3])); 387 #endif 388 } 389 390 static inline void ipv6_addr_prefix(struct in6_addr *pfx, 391 const struct in6_addr *addr, 392 int plen) 393 { 394 /* caller must guarantee 0 <= plen <= 128 */ 395 int o = plen >> 3, 396 b = plen & 0x7; 397 398 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr)); 399 memcpy(pfx->s6_addr, addr, o); 400 if (b != 0) 401 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b); 402 } 403 404 static inline void __ipv6_addr_set_half(__be32 *addr, 405 __be32 wh, __be32 wl) 406 { 407 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 408 #if defined(__BIG_ENDIAN) 409 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) { 410 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl)); 411 return; 412 } 413 #elif defined(__LITTLE_ENDIAN) 414 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) { 415 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh)); 416 return; 417 } 418 #endif 419 #endif 420 addr[0] = wh; 421 addr[1] = wl; 422 } 423 424 static inline void ipv6_addr_set(struct in6_addr *addr, 425 __be32 w1, __be32 w2, 426 __be32 w3, __be32 w4) 427 { 428 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2); 429 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4); 430 } 431 432 static inline bool ipv6_addr_equal(const struct in6_addr *a1, 433 const struct in6_addr *a2) 434 { 435 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 436 const unsigned long *ul1 = (const unsigned long *)a1; 437 const unsigned long *ul2 = (const unsigned long *)a2; 438 439 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL; 440 #else 441 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) | 442 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) | 443 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) | 444 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0; 445 #endif 446 } 447 448 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 449 static inline bool __ipv6_prefix_equal64_half(const __be64 *a1, 450 const __be64 *a2, 451 unsigned int len) 452 { 453 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len)))) 454 return false; 455 return true; 456 } 457 458 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1, 459 const struct in6_addr *addr2, 460 unsigned int prefixlen) 461 { 462 const __be64 *a1 = (const __be64 *)addr1; 463 const __be64 *a2 = (const __be64 *)addr2; 464 465 if (prefixlen >= 64) { 466 if (a1[0] ^ a2[0]) 467 return false; 468 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64); 469 } 470 return __ipv6_prefix_equal64_half(a1, a2, prefixlen); 471 } 472 #else 473 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1, 474 const struct in6_addr *addr2, 475 unsigned int prefixlen) 476 { 477 const __be32 *a1 = addr1->s6_addr32; 478 const __be32 *a2 = addr2->s6_addr32; 479 unsigned int pdw, pbi; 480 481 /* check complete u32 in prefix */ 482 pdw = prefixlen >> 5; 483 if (pdw && memcmp(a1, a2, pdw << 2)) 484 return false; 485 486 /* check incomplete u32 in prefix */ 487 pbi = prefixlen & 0x1f; 488 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi)))) 489 return false; 490 491 return true; 492 } 493 #endif 494 495 struct inet_frag_queue; 496 497 enum ip6_defrag_users { 498 IP6_DEFRAG_LOCAL_DELIVER, 499 IP6_DEFRAG_CONNTRACK_IN, 500 __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX, 501 IP6_DEFRAG_CONNTRACK_OUT, 502 __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX, 503 IP6_DEFRAG_CONNTRACK_BRIDGE_IN, 504 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX, 505 }; 506 507 struct ip6_create_arg { 508 __be32 id; 509 u32 user; 510 const struct in6_addr *src; 511 const struct in6_addr *dst; 512 int iif; 513 u8 ecn; 514 }; 515 516 void ip6_frag_init(struct inet_frag_queue *q, const void *a); 517 bool ip6_frag_match(const struct inet_frag_queue *q, const void *a); 518 519 /* 520 * Equivalent of ipv4 struct ip 521 */ 522 struct frag_queue { 523 struct inet_frag_queue q; 524 525 __be32 id; /* fragment id */ 526 u32 user; 527 struct in6_addr saddr; 528 struct in6_addr daddr; 529 530 int iif; 531 unsigned int csum; 532 __u16 nhoffset; 533 u8 ecn; 534 }; 535 536 void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq, 537 struct inet_frags *frags); 538 539 static inline bool ipv6_addr_any(const struct in6_addr *a) 540 { 541 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 542 const unsigned long *ul = (const unsigned long *)a; 543 544 return (ul[0] | ul[1]) == 0UL; 545 #else 546 return (a->s6_addr32[0] | a->s6_addr32[1] | 547 a->s6_addr32[2] | a->s6_addr32[3]) == 0; 548 #endif 549 } 550 551 static inline u32 ipv6_addr_hash(const struct in6_addr *a) 552 { 553 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 554 const unsigned long *ul = (const unsigned long *)a; 555 unsigned long x = ul[0] ^ ul[1]; 556 557 return (u32)(x ^ (x >> 32)); 558 #else 559 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^ 560 a->s6_addr32[2] ^ a->s6_addr32[3]); 561 #endif 562 } 563 564 /* more secured version of ipv6_addr_hash() */ 565 static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval) 566 { 567 u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1]; 568 569 return jhash_3words(v, 570 (__force u32)a->s6_addr32[2], 571 (__force u32)a->s6_addr32[3], 572 initval); 573 } 574 575 static inline bool ipv6_addr_loopback(const struct in6_addr *a) 576 { 577 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 578 const __be64 *be = (const __be64 *)a; 579 580 return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL; 581 #else 582 return (a->s6_addr32[0] | a->s6_addr32[1] | 583 a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0; 584 #endif 585 } 586 587 /* 588 * Note that we must __force cast these to unsigned long to make sparse happy, 589 * since all of the endian-annotated types are fixed size regardless of arch. 590 */ 591 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a) 592 { 593 return ( 594 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 595 *(unsigned long *)a | 596 #else 597 (__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) | 598 #endif 599 (__force unsigned long)(a->s6_addr32[2] ^ 600 cpu_to_be32(0x0000ffff))) == 0UL; 601 } 602 603 /* 604 * Check for a RFC 4843 ORCHID address 605 * (Overlay Routable Cryptographic Hash Identifiers) 606 */ 607 static inline bool ipv6_addr_orchid(const struct in6_addr *a) 608 { 609 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010); 610 } 611 612 static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr) 613 { 614 return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000); 615 } 616 617 static inline void ipv6_addr_set_v4mapped(const __be32 addr, 618 struct in6_addr *v4mapped) 619 { 620 ipv6_addr_set(v4mapped, 621 0, 0, 622 htonl(0x0000FFFF), 623 addr); 624 } 625 626 /* 627 * find the first different bit between two addresses 628 * length of address must be a multiple of 32bits 629 */ 630 static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen) 631 { 632 const __be32 *a1 = token1, *a2 = token2; 633 int i; 634 635 addrlen >>= 2; 636 637 for (i = 0; i < addrlen; i++) { 638 __be32 xb = a1[i] ^ a2[i]; 639 if (xb) 640 return i * 32 + 31 - __fls(ntohl(xb)); 641 } 642 643 /* 644 * we should *never* get to this point since that 645 * would mean the addrs are equal 646 * 647 * However, we do get to it 8) And exacly, when 648 * addresses are equal 8) 649 * 650 * ip route add 1111::/128 via ... 651 * ip route add 1111::/64 via ... 652 * and we are here. 653 * 654 * Ideally, this function should stop comparison 655 * at prefix length. It does not, but it is still OK, 656 * if returned value is greater than prefix length. 657 * --ANK (980803) 658 */ 659 return addrlen << 5; 660 } 661 662 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 663 static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen) 664 { 665 const __be64 *a1 = token1, *a2 = token2; 666 int i; 667 668 addrlen >>= 3; 669 670 for (i = 0; i < addrlen; i++) { 671 __be64 xb = a1[i] ^ a2[i]; 672 if (xb) 673 return i * 64 + 63 - __fls(be64_to_cpu(xb)); 674 } 675 676 return addrlen << 6; 677 } 678 #endif 679 680 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen) 681 { 682 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 683 if (__builtin_constant_p(addrlen) && !(addrlen & 7)) 684 return __ipv6_addr_diff64(token1, token2, addrlen); 685 #endif 686 return __ipv6_addr_diff32(token1, token2, addrlen); 687 } 688 689 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2) 690 { 691 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr)); 692 } 693 694 __be32 ipv6_select_ident(struct net *net, 695 const struct in6_addr *daddr, 696 const struct in6_addr *saddr); 697 void ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb); 698 699 int ip6_dst_hoplimit(struct dst_entry *dst); 700 701 static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6, 702 struct dst_entry *dst) 703 { 704 int hlimit; 705 706 if (ipv6_addr_is_multicast(&fl6->daddr)) 707 hlimit = np->mcast_hops; 708 else 709 hlimit = np->hop_limit; 710 if (hlimit < 0) 711 hlimit = ip6_dst_hoplimit(dst); 712 return hlimit; 713 } 714 715 /* copy IPv6 saddr & daddr to flow_keys, possibly using 64bit load/store 716 * Equivalent to : flow->v6addrs.src = iph->saddr; 717 * flow->v6addrs.dst = iph->daddr; 718 */ 719 static inline void iph_to_flow_copy_v6addrs(struct flow_keys *flow, 720 const struct ipv6hdr *iph) 721 { 722 BUILD_BUG_ON(offsetof(typeof(flow->addrs), v6addrs.dst) != 723 offsetof(typeof(flow->addrs), v6addrs.src) + 724 sizeof(flow->addrs.v6addrs.src)); 725 memcpy(&flow->addrs.v6addrs, &iph->saddr, sizeof(flow->addrs.v6addrs)); 726 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; 727 } 728 729 #if IS_ENABLED(CONFIG_IPV6) 730 731 /* Sysctl settings for net ipv6.auto_flowlabels */ 732 #define IP6_AUTO_FLOW_LABEL_OFF 0 733 #define IP6_AUTO_FLOW_LABEL_OPTOUT 1 734 #define IP6_AUTO_FLOW_LABEL_OPTIN 2 735 #define IP6_AUTO_FLOW_LABEL_FORCED 3 736 737 #define IP6_AUTO_FLOW_LABEL_MAX IP6_AUTO_FLOW_LABEL_FORCED 738 739 #define IP6_DEFAULT_AUTO_FLOW_LABELS IP6_AUTO_FLOW_LABEL_OPTOUT 740 741 static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb, 742 __be32 flowlabel, bool autolabel, 743 struct flowi6 *fl6) 744 { 745 u32 hash; 746 747 if (flowlabel || 748 net->ipv6.sysctl.auto_flowlabels == IP6_AUTO_FLOW_LABEL_OFF || 749 (!autolabel && 750 net->ipv6.sysctl.auto_flowlabels != IP6_AUTO_FLOW_LABEL_FORCED)) 751 return flowlabel; 752 753 hash = skb_get_hash_flowi6(skb, fl6); 754 755 /* Since this is being sent on the wire obfuscate hash a bit 756 * to minimize possbility that any useful information to an 757 * attacker is leaked. Only lower 20 bits are relevant. 758 */ 759 rol32(hash, 16); 760 761 flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK; 762 763 if (net->ipv6.sysctl.flowlabel_state_ranges) 764 flowlabel |= IPV6_FLOWLABEL_STATELESS_FLAG; 765 766 return flowlabel; 767 } 768 769 static inline int ip6_default_np_autolabel(struct net *net) 770 { 771 switch (net->ipv6.sysctl.auto_flowlabels) { 772 case IP6_AUTO_FLOW_LABEL_OFF: 773 case IP6_AUTO_FLOW_LABEL_OPTIN: 774 default: 775 return 0; 776 case IP6_AUTO_FLOW_LABEL_OPTOUT: 777 case IP6_AUTO_FLOW_LABEL_FORCED: 778 return 1; 779 } 780 } 781 #else 782 static inline void ip6_set_txhash(struct sock *sk) { } 783 static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb, 784 __be32 flowlabel, bool autolabel, 785 struct flowi6 *fl6) 786 { 787 return flowlabel; 788 } 789 static inline int ip6_default_np_autolabel(struct net *net) 790 { 791 return 0; 792 } 793 #endif 794 795 796 /* 797 * Header manipulation 798 */ 799 static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass, 800 __be32 flowlabel) 801 { 802 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel; 803 } 804 805 static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr) 806 { 807 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK; 808 } 809 810 static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr) 811 { 812 return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK; 813 } 814 815 static inline u8 ip6_tclass(__be32 flowinfo) 816 { 817 return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT; 818 } 819 /* 820 * Prototypes exported by ipv6 821 */ 822 823 /* 824 * rcv function (called from netdevice level) 825 */ 826 827 int ipv6_rcv(struct sk_buff *skb, struct net_device *dev, 828 struct packet_type *pt, struct net_device *orig_dev); 829 830 int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 831 832 /* 833 * upper-layer output functions 834 */ 835 int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6, 836 struct ipv6_txoptions *opt, int tclass); 837 838 int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr); 839 840 int ip6_append_data(struct sock *sk, 841 int getfrag(void *from, char *to, int offset, int len, 842 int odd, struct sk_buff *skb), 843 void *from, int length, int transhdrlen, int hlimit, 844 int tclass, struct ipv6_txoptions *opt, struct flowi6 *fl6, 845 struct rt6_info *rt, unsigned int flags, int dontfrag); 846 847 int ip6_push_pending_frames(struct sock *sk); 848 849 void ip6_flush_pending_frames(struct sock *sk); 850 851 int ip6_send_skb(struct sk_buff *skb); 852 853 struct sk_buff *__ip6_make_skb(struct sock *sk, struct sk_buff_head *queue, 854 struct inet_cork_full *cork, 855 struct inet6_cork *v6_cork); 856 struct sk_buff *ip6_make_skb(struct sock *sk, 857 int getfrag(void *from, char *to, int offset, 858 int len, int odd, struct sk_buff *skb), 859 void *from, int length, int transhdrlen, 860 int hlimit, int tclass, struct ipv6_txoptions *opt, 861 struct flowi6 *fl6, struct rt6_info *rt, 862 unsigned int flags, int dontfrag); 863 864 static inline struct sk_buff *ip6_finish_skb(struct sock *sk) 865 { 866 return __ip6_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork, 867 &inet6_sk(sk)->cork); 868 } 869 870 int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst, 871 struct flowi6 *fl6); 872 struct dst_entry *ip6_dst_lookup_flow(const struct sock *sk, struct flowi6 *fl6, 873 const struct in6_addr *final_dst); 874 struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6, 875 const struct in6_addr *final_dst); 876 struct dst_entry *ip6_blackhole_route(struct net *net, 877 struct dst_entry *orig_dst); 878 879 /* 880 * skb processing functions 881 */ 882 883 int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb); 884 int ip6_forward(struct sk_buff *skb); 885 int ip6_input(struct sk_buff *skb); 886 int ip6_mc_input(struct sk_buff *skb); 887 888 int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); 889 int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); 890 891 /* 892 * Extension header (options) processing 893 */ 894 895 void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, 896 u8 *proto, struct in6_addr **daddr_p); 897 void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, 898 u8 *proto); 899 900 int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp, 901 __be16 *frag_offp); 902 903 bool ipv6_ext_hdr(u8 nexthdr); 904 905 enum { 906 IP6_FH_F_FRAG = (1 << 0), 907 IP6_FH_F_AUTH = (1 << 1), 908 IP6_FH_F_SKIP_RH = (1 << 2), 909 }; 910 911 /* find specified header and get offset to it */ 912 int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target, 913 unsigned short *fragoff, int *fragflg); 914 915 int ipv6_find_tlv(struct sk_buff *skb, int offset, int type); 916 917 struct in6_addr *fl6_update_dst(struct flowi6 *fl6, 918 const struct ipv6_txoptions *opt, 919 struct in6_addr *orig); 920 921 /* 922 * socket options (ipv6_sockglue.c) 923 */ 924 925 int ipv6_setsockopt(struct sock *sk, int level, int optname, 926 char __user *optval, unsigned int optlen); 927 int ipv6_getsockopt(struct sock *sk, int level, int optname, 928 char __user *optval, int __user *optlen); 929 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname, 930 char __user *optval, unsigned int optlen); 931 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname, 932 char __user *optval, int __user *optlen); 933 934 int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len); 935 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr, 936 int addr_len); 937 938 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, 939 int *addr_len); 940 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len, 941 int *addr_len); 942 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, 943 u32 info, u8 *payload); 944 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info); 945 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu); 946 947 int inet6_release(struct socket *sock); 948 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len); 949 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len, 950 int peer); 951 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg); 952 953 int inet6_hash_connect(struct inet_timewait_death_row *death_row, 954 struct sock *sk); 955 956 /* 957 * reassembly.c 958 */ 959 extern const struct proto_ops inet6_stream_ops; 960 extern const struct proto_ops inet6_dgram_ops; 961 962 struct group_source_req; 963 struct group_filter; 964 965 int ip6_mc_source(int add, int omode, struct sock *sk, 966 struct group_source_req *pgsr); 967 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf); 968 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 969 struct group_filter __user *optval, int __user *optlen); 970 971 #ifdef CONFIG_PROC_FS 972 int ac6_proc_init(struct net *net); 973 void ac6_proc_exit(struct net *net); 974 int raw6_proc_init(void); 975 void raw6_proc_exit(void); 976 int tcp6_proc_init(struct net *net); 977 void tcp6_proc_exit(struct net *net); 978 int udp6_proc_init(struct net *net); 979 void udp6_proc_exit(struct net *net); 980 int udplite6_proc_init(void); 981 void udplite6_proc_exit(void); 982 int ipv6_misc_proc_init(void); 983 void ipv6_misc_proc_exit(void); 984 int snmp6_register_dev(struct inet6_dev *idev); 985 int snmp6_unregister_dev(struct inet6_dev *idev); 986 987 #else 988 static inline int ac6_proc_init(struct net *net) { return 0; } 989 static inline void ac6_proc_exit(struct net *net) { } 990 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; } 991 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; } 992 #endif 993 994 #ifdef CONFIG_SYSCTL 995 extern struct ctl_table ipv6_route_table_template[]; 996 997 struct ctl_table *ipv6_icmp_sysctl_init(struct net *net); 998 struct ctl_table *ipv6_route_sysctl_init(struct net *net); 999 int ipv6_sysctl_register(void); 1000 void ipv6_sysctl_unregister(void); 1001 #endif 1002 1003 int ipv6_sock_mc_join(struct sock *sk, int ifindex, 1004 const struct in6_addr *addr); 1005 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, 1006 const struct in6_addr *addr); 1007 #endif /* _NET_IPV6_H */ 1008