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_prefix_copy(struct in6_addr *addr, 405 const struct in6_addr *pfx, 406 int plen) 407 { 408 /* caller must guarantee 0 <= plen <= 128 */ 409 int o = plen >> 3, 410 b = plen & 0x7; 411 412 memcpy(addr->s6_addr, pfx, o); 413 if (b != 0) { 414 addr->s6_addr[o] &= ~(0xff00 >> b); 415 addr->s6_addr[o] |= (pfx->s6_addr[o] & (0xff00 >> b)); 416 } 417 } 418 419 static inline void __ipv6_addr_set_half(__be32 *addr, 420 __be32 wh, __be32 wl) 421 { 422 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 423 #if defined(__BIG_ENDIAN) 424 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) { 425 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl)); 426 return; 427 } 428 #elif defined(__LITTLE_ENDIAN) 429 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) { 430 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh)); 431 return; 432 } 433 #endif 434 #endif 435 addr[0] = wh; 436 addr[1] = wl; 437 } 438 439 static inline void ipv6_addr_set(struct in6_addr *addr, 440 __be32 w1, __be32 w2, 441 __be32 w3, __be32 w4) 442 { 443 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2); 444 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4); 445 } 446 447 static inline bool ipv6_addr_equal(const struct in6_addr *a1, 448 const struct in6_addr *a2) 449 { 450 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 451 const unsigned long *ul1 = (const unsigned long *)a1; 452 const unsigned long *ul2 = (const unsigned long *)a2; 453 454 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL; 455 #else 456 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) | 457 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) | 458 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) | 459 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0; 460 #endif 461 } 462 463 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 464 static inline bool __ipv6_prefix_equal64_half(const __be64 *a1, 465 const __be64 *a2, 466 unsigned int len) 467 { 468 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len)))) 469 return false; 470 return true; 471 } 472 473 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1, 474 const struct in6_addr *addr2, 475 unsigned int prefixlen) 476 { 477 const __be64 *a1 = (const __be64 *)addr1; 478 const __be64 *a2 = (const __be64 *)addr2; 479 480 if (prefixlen >= 64) { 481 if (a1[0] ^ a2[0]) 482 return false; 483 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64); 484 } 485 return __ipv6_prefix_equal64_half(a1, a2, prefixlen); 486 } 487 #else 488 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1, 489 const struct in6_addr *addr2, 490 unsigned int prefixlen) 491 { 492 const __be32 *a1 = addr1->s6_addr32; 493 const __be32 *a2 = addr2->s6_addr32; 494 unsigned int pdw, pbi; 495 496 /* check complete u32 in prefix */ 497 pdw = prefixlen >> 5; 498 if (pdw && memcmp(a1, a2, pdw << 2)) 499 return false; 500 501 /* check incomplete u32 in prefix */ 502 pbi = prefixlen & 0x1f; 503 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi)))) 504 return false; 505 506 return true; 507 } 508 #endif 509 510 struct inet_frag_queue; 511 512 enum ip6_defrag_users { 513 IP6_DEFRAG_LOCAL_DELIVER, 514 IP6_DEFRAG_CONNTRACK_IN, 515 __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX, 516 IP6_DEFRAG_CONNTRACK_OUT, 517 __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX, 518 IP6_DEFRAG_CONNTRACK_BRIDGE_IN, 519 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX, 520 }; 521 522 struct ip6_create_arg { 523 __be32 id; 524 u32 user; 525 const struct in6_addr *src; 526 const struct in6_addr *dst; 527 int iif; 528 u8 ecn; 529 }; 530 531 void ip6_frag_init(struct inet_frag_queue *q, const void *a); 532 bool ip6_frag_match(const struct inet_frag_queue *q, const void *a); 533 534 /* 535 * Equivalent of ipv4 struct ip 536 */ 537 struct frag_queue { 538 struct inet_frag_queue q; 539 540 __be32 id; /* fragment id */ 541 u32 user; 542 struct in6_addr saddr; 543 struct in6_addr daddr; 544 545 int iif; 546 unsigned int csum; 547 __u16 nhoffset; 548 u8 ecn; 549 }; 550 551 void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq, 552 struct inet_frags *frags); 553 554 static inline bool ipv6_addr_any(const struct in6_addr *a) 555 { 556 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 557 const unsigned long *ul = (const unsigned long *)a; 558 559 return (ul[0] | ul[1]) == 0UL; 560 #else 561 return (a->s6_addr32[0] | a->s6_addr32[1] | 562 a->s6_addr32[2] | a->s6_addr32[3]) == 0; 563 #endif 564 } 565 566 static inline u32 ipv6_addr_hash(const struct in6_addr *a) 567 { 568 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 569 const unsigned long *ul = (const unsigned long *)a; 570 unsigned long x = ul[0] ^ ul[1]; 571 572 return (u32)(x ^ (x >> 32)); 573 #else 574 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^ 575 a->s6_addr32[2] ^ a->s6_addr32[3]); 576 #endif 577 } 578 579 /* more secured version of ipv6_addr_hash() */ 580 static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval) 581 { 582 u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1]; 583 584 return jhash_3words(v, 585 (__force u32)a->s6_addr32[2], 586 (__force u32)a->s6_addr32[3], 587 initval); 588 } 589 590 static inline bool ipv6_addr_loopback(const struct in6_addr *a) 591 { 592 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 593 const __be64 *be = (const __be64 *)a; 594 595 return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL; 596 #else 597 return (a->s6_addr32[0] | a->s6_addr32[1] | 598 a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0; 599 #endif 600 } 601 602 /* 603 * Note that we must __force cast these to unsigned long to make sparse happy, 604 * since all of the endian-annotated types are fixed size regardless of arch. 605 */ 606 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a) 607 { 608 return ( 609 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 610 *(unsigned long *)a | 611 #else 612 (__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) | 613 #endif 614 (__force unsigned long)(a->s6_addr32[2] ^ 615 cpu_to_be32(0x0000ffff))) == 0UL; 616 } 617 618 /* 619 * Check for a RFC 4843 ORCHID address 620 * (Overlay Routable Cryptographic Hash Identifiers) 621 */ 622 static inline bool ipv6_addr_orchid(const struct in6_addr *a) 623 { 624 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010); 625 } 626 627 static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr) 628 { 629 return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000); 630 } 631 632 static inline void ipv6_addr_set_v4mapped(const __be32 addr, 633 struct in6_addr *v4mapped) 634 { 635 ipv6_addr_set(v4mapped, 636 0, 0, 637 htonl(0x0000FFFF), 638 addr); 639 } 640 641 /* 642 * find the first different bit between two addresses 643 * length of address must be a multiple of 32bits 644 */ 645 static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen) 646 { 647 const __be32 *a1 = token1, *a2 = token2; 648 int i; 649 650 addrlen >>= 2; 651 652 for (i = 0; i < addrlen; i++) { 653 __be32 xb = a1[i] ^ a2[i]; 654 if (xb) 655 return i * 32 + 31 - __fls(ntohl(xb)); 656 } 657 658 /* 659 * we should *never* get to this point since that 660 * would mean the addrs are equal 661 * 662 * However, we do get to it 8) And exacly, when 663 * addresses are equal 8) 664 * 665 * ip route add 1111::/128 via ... 666 * ip route add 1111::/64 via ... 667 * and we are here. 668 * 669 * Ideally, this function should stop comparison 670 * at prefix length. It does not, but it is still OK, 671 * if returned value is greater than prefix length. 672 * --ANK (980803) 673 */ 674 return addrlen << 5; 675 } 676 677 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 678 static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen) 679 { 680 const __be64 *a1 = token1, *a2 = token2; 681 int i; 682 683 addrlen >>= 3; 684 685 for (i = 0; i < addrlen; i++) { 686 __be64 xb = a1[i] ^ a2[i]; 687 if (xb) 688 return i * 64 + 63 - __fls(be64_to_cpu(xb)); 689 } 690 691 return addrlen << 6; 692 } 693 #endif 694 695 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen) 696 { 697 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 698 if (__builtin_constant_p(addrlen) && !(addrlen & 7)) 699 return __ipv6_addr_diff64(token1, token2, addrlen); 700 #endif 701 return __ipv6_addr_diff32(token1, token2, addrlen); 702 } 703 704 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2) 705 { 706 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr)); 707 } 708 709 __be32 ipv6_select_ident(struct net *net, 710 const struct in6_addr *daddr, 711 const struct in6_addr *saddr); 712 void ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb); 713 714 int ip6_dst_hoplimit(struct dst_entry *dst); 715 716 static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6, 717 struct dst_entry *dst) 718 { 719 int hlimit; 720 721 if (ipv6_addr_is_multicast(&fl6->daddr)) 722 hlimit = np->mcast_hops; 723 else 724 hlimit = np->hop_limit; 725 if (hlimit < 0) 726 hlimit = ip6_dst_hoplimit(dst); 727 return hlimit; 728 } 729 730 /* copy IPv6 saddr & daddr to flow_keys, possibly using 64bit load/store 731 * Equivalent to : flow->v6addrs.src = iph->saddr; 732 * flow->v6addrs.dst = iph->daddr; 733 */ 734 static inline void iph_to_flow_copy_v6addrs(struct flow_keys *flow, 735 const struct ipv6hdr *iph) 736 { 737 BUILD_BUG_ON(offsetof(typeof(flow->addrs), v6addrs.dst) != 738 offsetof(typeof(flow->addrs), v6addrs.src) + 739 sizeof(flow->addrs.v6addrs.src)); 740 memcpy(&flow->addrs.v6addrs, &iph->saddr, sizeof(flow->addrs.v6addrs)); 741 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; 742 } 743 744 #if IS_ENABLED(CONFIG_IPV6) 745 746 /* Sysctl settings for net ipv6.auto_flowlabels */ 747 #define IP6_AUTO_FLOW_LABEL_OFF 0 748 #define IP6_AUTO_FLOW_LABEL_OPTOUT 1 749 #define IP6_AUTO_FLOW_LABEL_OPTIN 2 750 #define IP6_AUTO_FLOW_LABEL_FORCED 3 751 752 #define IP6_AUTO_FLOW_LABEL_MAX IP6_AUTO_FLOW_LABEL_FORCED 753 754 #define IP6_DEFAULT_AUTO_FLOW_LABELS IP6_AUTO_FLOW_LABEL_OPTOUT 755 756 static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb, 757 __be32 flowlabel, bool autolabel, 758 struct flowi6 *fl6) 759 { 760 u32 hash; 761 762 if (flowlabel || 763 net->ipv6.sysctl.auto_flowlabels == IP6_AUTO_FLOW_LABEL_OFF || 764 (!autolabel && 765 net->ipv6.sysctl.auto_flowlabels != IP6_AUTO_FLOW_LABEL_FORCED)) 766 return flowlabel; 767 768 hash = skb_get_hash_flowi6(skb, fl6); 769 770 /* Since this is being sent on the wire obfuscate hash a bit 771 * to minimize possbility that any useful information to an 772 * attacker is leaked. Only lower 20 bits are relevant. 773 */ 774 rol32(hash, 16); 775 776 flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK; 777 778 if (net->ipv6.sysctl.flowlabel_state_ranges) 779 flowlabel |= IPV6_FLOWLABEL_STATELESS_FLAG; 780 781 return flowlabel; 782 } 783 784 static inline int ip6_default_np_autolabel(struct net *net) 785 { 786 switch (net->ipv6.sysctl.auto_flowlabels) { 787 case IP6_AUTO_FLOW_LABEL_OFF: 788 case IP6_AUTO_FLOW_LABEL_OPTIN: 789 default: 790 return 0; 791 case IP6_AUTO_FLOW_LABEL_OPTOUT: 792 case IP6_AUTO_FLOW_LABEL_FORCED: 793 return 1; 794 } 795 } 796 #else 797 static inline void ip6_set_txhash(struct sock *sk) { } 798 static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb, 799 __be32 flowlabel, bool autolabel, 800 struct flowi6 *fl6) 801 { 802 return flowlabel; 803 } 804 static inline int ip6_default_np_autolabel(struct net *net) 805 { 806 return 0; 807 } 808 #endif 809 810 811 /* 812 * Header manipulation 813 */ 814 static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass, 815 __be32 flowlabel) 816 { 817 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel; 818 } 819 820 static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr) 821 { 822 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK; 823 } 824 825 static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr) 826 { 827 return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK; 828 } 829 830 static inline u8 ip6_tclass(__be32 flowinfo) 831 { 832 return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT; 833 } 834 /* 835 * Prototypes exported by ipv6 836 */ 837 838 /* 839 * rcv function (called from netdevice level) 840 */ 841 842 int ipv6_rcv(struct sk_buff *skb, struct net_device *dev, 843 struct packet_type *pt, struct net_device *orig_dev); 844 845 int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 846 847 /* 848 * upper-layer output functions 849 */ 850 int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6, 851 struct ipv6_txoptions *opt, int tclass); 852 853 int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr); 854 855 int ip6_append_data(struct sock *sk, 856 int getfrag(void *from, char *to, int offset, int len, 857 int odd, struct sk_buff *skb), 858 void *from, int length, int transhdrlen, int hlimit, 859 int tclass, struct ipv6_txoptions *opt, struct flowi6 *fl6, 860 struct rt6_info *rt, unsigned int flags, int dontfrag); 861 862 int ip6_push_pending_frames(struct sock *sk); 863 864 void ip6_flush_pending_frames(struct sock *sk); 865 866 int ip6_send_skb(struct sk_buff *skb); 867 868 struct sk_buff *__ip6_make_skb(struct sock *sk, struct sk_buff_head *queue, 869 struct inet_cork_full *cork, 870 struct inet6_cork *v6_cork); 871 struct sk_buff *ip6_make_skb(struct sock *sk, 872 int getfrag(void *from, char *to, int offset, 873 int len, int odd, struct sk_buff *skb), 874 void *from, int length, int transhdrlen, 875 int hlimit, int tclass, struct ipv6_txoptions *opt, 876 struct flowi6 *fl6, struct rt6_info *rt, 877 unsigned int flags, int dontfrag); 878 879 static inline struct sk_buff *ip6_finish_skb(struct sock *sk) 880 { 881 return __ip6_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork, 882 &inet6_sk(sk)->cork); 883 } 884 885 int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst, 886 struct flowi6 *fl6); 887 struct dst_entry *ip6_dst_lookup_flow(const struct sock *sk, struct flowi6 *fl6, 888 const struct in6_addr *final_dst); 889 struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6, 890 const struct in6_addr *final_dst); 891 struct dst_entry *ip6_blackhole_route(struct net *net, 892 struct dst_entry *orig_dst); 893 894 /* 895 * skb processing functions 896 */ 897 898 int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb); 899 int ip6_forward(struct sk_buff *skb); 900 int ip6_input(struct sk_buff *skb); 901 int ip6_mc_input(struct sk_buff *skb); 902 903 int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); 904 int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); 905 906 /* 907 * Extension header (options) processing 908 */ 909 910 void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, 911 u8 *proto, struct in6_addr **daddr_p); 912 void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, 913 u8 *proto); 914 915 int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp, 916 __be16 *frag_offp); 917 918 bool ipv6_ext_hdr(u8 nexthdr); 919 920 enum { 921 IP6_FH_F_FRAG = (1 << 0), 922 IP6_FH_F_AUTH = (1 << 1), 923 IP6_FH_F_SKIP_RH = (1 << 2), 924 }; 925 926 /* find specified header and get offset to it */ 927 int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target, 928 unsigned short *fragoff, int *fragflg); 929 930 int ipv6_find_tlv(struct sk_buff *skb, int offset, int type); 931 932 struct in6_addr *fl6_update_dst(struct flowi6 *fl6, 933 const struct ipv6_txoptions *opt, 934 struct in6_addr *orig); 935 936 /* 937 * socket options (ipv6_sockglue.c) 938 */ 939 940 int ipv6_setsockopt(struct sock *sk, int level, int optname, 941 char __user *optval, unsigned int optlen); 942 int ipv6_getsockopt(struct sock *sk, int level, int optname, 943 char __user *optval, int __user *optlen); 944 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname, 945 char __user *optval, unsigned int optlen); 946 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname, 947 char __user *optval, int __user *optlen); 948 949 int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len); 950 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr, 951 int addr_len); 952 953 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, 954 int *addr_len); 955 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len, 956 int *addr_len); 957 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, 958 u32 info, u8 *payload); 959 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info); 960 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu); 961 962 int inet6_release(struct socket *sock); 963 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len); 964 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len, 965 int peer); 966 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg); 967 968 int inet6_hash_connect(struct inet_timewait_death_row *death_row, 969 struct sock *sk); 970 971 /* 972 * reassembly.c 973 */ 974 extern const struct proto_ops inet6_stream_ops; 975 extern const struct proto_ops inet6_dgram_ops; 976 977 struct group_source_req; 978 struct group_filter; 979 980 int ip6_mc_source(int add, int omode, struct sock *sk, 981 struct group_source_req *pgsr); 982 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf); 983 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 984 struct group_filter __user *optval, int __user *optlen); 985 986 #ifdef CONFIG_PROC_FS 987 int ac6_proc_init(struct net *net); 988 void ac6_proc_exit(struct net *net); 989 int raw6_proc_init(void); 990 void raw6_proc_exit(void); 991 int tcp6_proc_init(struct net *net); 992 void tcp6_proc_exit(struct net *net); 993 int udp6_proc_init(struct net *net); 994 void udp6_proc_exit(struct net *net); 995 int udplite6_proc_init(void); 996 void udplite6_proc_exit(void); 997 int ipv6_misc_proc_init(void); 998 void ipv6_misc_proc_exit(void); 999 int snmp6_register_dev(struct inet6_dev *idev); 1000 int snmp6_unregister_dev(struct inet6_dev *idev); 1001 1002 #else 1003 static inline int ac6_proc_init(struct net *net) { return 0; } 1004 static inline void ac6_proc_exit(struct net *net) { } 1005 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; } 1006 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; } 1007 #endif 1008 1009 #ifdef CONFIG_SYSCTL 1010 extern struct ctl_table ipv6_route_table_template[]; 1011 1012 struct ctl_table *ipv6_icmp_sysctl_init(struct net *net); 1013 struct ctl_table *ipv6_route_sysctl_init(struct net *net); 1014 int ipv6_sysctl_register(void); 1015 void ipv6_sysctl_unregister(void); 1016 #endif 1017 1018 int ipv6_sock_mc_join(struct sock *sk, int ifindex, 1019 const struct in6_addr *addr); 1020 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, 1021 const struct in6_addr *addr); 1022 #endif /* _NET_IPV6_H */ 1023