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) { 263 if (!atomic_inc_not_zero(&opt->refcnt)) 264 opt = NULL; 265 else 266 opt = rcu_pointer_handoff(opt); 267 } 268 rcu_read_unlock(); 269 return opt; 270 } 271 272 static inline void txopt_put(struct ipv6_txoptions *opt) 273 { 274 if (opt && atomic_dec_and_test(&opt->refcnt)) 275 kfree_rcu(opt, rcu); 276 } 277 278 struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label); 279 struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space, 280 struct ip6_flowlabel *fl, 281 struct ipv6_txoptions *fopt); 282 void fl6_free_socklist(struct sock *sk); 283 int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen); 284 int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq, 285 int flags); 286 int ip6_flowlabel_init(void); 287 void ip6_flowlabel_cleanup(void); 288 289 static inline void fl6_sock_release(struct ip6_flowlabel *fl) 290 { 291 if (fl) 292 atomic_dec(&fl->users); 293 } 294 295 void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info); 296 297 int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, 298 struct icmp6hdr *thdr, int len); 299 300 int ip6_ra_control(struct sock *sk, int sel); 301 302 int ipv6_parse_hopopts(struct sk_buff *skb); 303 304 struct ipv6_txoptions *ipv6_dup_options(struct sock *sk, 305 struct ipv6_txoptions *opt); 306 struct ipv6_txoptions *ipv6_renew_options(struct sock *sk, 307 struct ipv6_txoptions *opt, 308 int newtype, 309 struct ipv6_opt_hdr __user *newopt, 310 int newoptlen); 311 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space, 312 struct ipv6_txoptions *opt); 313 314 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb, 315 const struct inet6_skb_parm *opt); 316 317 static inline bool ipv6_accept_ra(struct inet6_dev *idev) 318 { 319 /* If forwarding is enabled, RA are not accepted unless the special 320 * hybrid mode (accept_ra=2) is enabled. 321 */ 322 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 : 323 idev->cnf.accept_ra; 324 } 325 326 #if IS_ENABLED(CONFIG_IPV6) 327 static inline int ip6_frag_mem(struct net *net) 328 { 329 return sum_frag_mem_limit(&net->ipv6.frags); 330 } 331 #endif 332 333 #define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */ 334 #define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */ 335 #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */ 336 337 int __ipv6_addr_type(const struct in6_addr *addr); 338 static inline int ipv6_addr_type(const struct in6_addr *addr) 339 { 340 return __ipv6_addr_type(addr) & 0xffff; 341 } 342 343 static inline int ipv6_addr_scope(const struct in6_addr *addr) 344 { 345 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK; 346 } 347 348 static inline int __ipv6_addr_src_scope(int type) 349 { 350 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16); 351 } 352 353 static inline int ipv6_addr_src_scope(const struct in6_addr *addr) 354 { 355 return __ipv6_addr_src_scope(__ipv6_addr_type(addr)); 356 } 357 358 static inline bool __ipv6_addr_needs_scope_id(int type) 359 { 360 return type & IPV6_ADDR_LINKLOCAL || 361 (type & IPV6_ADDR_MULTICAST && 362 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL))); 363 } 364 365 static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface) 366 { 367 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0; 368 } 369 370 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2) 371 { 372 return memcmp(a1, a2, sizeof(struct in6_addr)); 373 } 374 375 static inline bool 376 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m, 377 const struct in6_addr *a2) 378 { 379 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 380 const unsigned long *ul1 = (const unsigned long *)a1; 381 const unsigned long *ulm = (const unsigned long *)m; 382 const unsigned long *ul2 = (const unsigned long *)a2; 383 384 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) | 385 ((ul1[1] ^ ul2[1]) & ulm[1])); 386 #else 387 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) | 388 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) | 389 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) | 390 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3])); 391 #endif 392 } 393 394 static inline void ipv6_addr_prefix(struct in6_addr *pfx, 395 const struct in6_addr *addr, 396 int plen) 397 { 398 /* caller must guarantee 0 <= plen <= 128 */ 399 int o = plen >> 3, 400 b = plen & 0x7; 401 402 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr)); 403 memcpy(pfx->s6_addr, addr, o); 404 if (b != 0) 405 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b); 406 } 407 408 static inline void ipv6_addr_prefix_copy(struct in6_addr *addr, 409 const struct in6_addr *pfx, 410 int plen) 411 { 412 /* caller must guarantee 0 <= plen <= 128 */ 413 int o = plen >> 3, 414 b = plen & 0x7; 415 416 memcpy(addr->s6_addr, pfx, o); 417 if (b != 0) { 418 addr->s6_addr[o] &= ~(0xff00 >> b); 419 addr->s6_addr[o] |= (pfx->s6_addr[o] & (0xff00 >> b)); 420 } 421 } 422 423 static inline void __ipv6_addr_set_half(__be32 *addr, 424 __be32 wh, __be32 wl) 425 { 426 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 427 #if defined(__BIG_ENDIAN) 428 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) { 429 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl)); 430 return; 431 } 432 #elif defined(__LITTLE_ENDIAN) 433 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) { 434 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh)); 435 return; 436 } 437 #endif 438 #endif 439 addr[0] = wh; 440 addr[1] = wl; 441 } 442 443 static inline void ipv6_addr_set(struct in6_addr *addr, 444 __be32 w1, __be32 w2, 445 __be32 w3, __be32 w4) 446 { 447 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2); 448 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4); 449 } 450 451 static inline bool ipv6_addr_equal(const struct in6_addr *a1, 452 const struct in6_addr *a2) 453 { 454 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 455 const unsigned long *ul1 = (const unsigned long *)a1; 456 const unsigned long *ul2 = (const unsigned long *)a2; 457 458 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL; 459 #else 460 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) | 461 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) | 462 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) | 463 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0; 464 #endif 465 } 466 467 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 468 static inline bool __ipv6_prefix_equal64_half(const __be64 *a1, 469 const __be64 *a2, 470 unsigned int len) 471 { 472 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len)))) 473 return false; 474 return true; 475 } 476 477 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1, 478 const struct in6_addr *addr2, 479 unsigned int prefixlen) 480 { 481 const __be64 *a1 = (const __be64 *)addr1; 482 const __be64 *a2 = (const __be64 *)addr2; 483 484 if (prefixlen >= 64) { 485 if (a1[0] ^ a2[0]) 486 return false; 487 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64); 488 } 489 return __ipv6_prefix_equal64_half(a1, a2, prefixlen); 490 } 491 #else 492 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1, 493 const struct in6_addr *addr2, 494 unsigned int prefixlen) 495 { 496 const __be32 *a1 = addr1->s6_addr32; 497 const __be32 *a2 = addr2->s6_addr32; 498 unsigned int pdw, pbi; 499 500 /* check complete u32 in prefix */ 501 pdw = prefixlen >> 5; 502 if (pdw && memcmp(a1, a2, pdw << 2)) 503 return false; 504 505 /* check incomplete u32 in prefix */ 506 pbi = prefixlen & 0x1f; 507 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi)))) 508 return false; 509 510 return true; 511 } 512 #endif 513 514 struct inet_frag_queue; 515 516 enum ip6_defrag_users { 517 IP6_DEFRAG_LOCAL_DELIVER, 518 IP6_DEFRAG_CONNTRACK_IN, 519 __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX, 520 IP6_DEFRAG_CONNTRACK_OUT, 521 __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX, 522 IP6_DEFRAG_CONNTRACK_BRIDGE_IN, 523 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX, 524 }; 525 526 struct ip6_create_arg { 527 __be32 id; 528 u32 user; 529 const struct in6_addr *src; 530 const struct in6_addr *dst; 531 int iif; 532 u8 ecn; 533 }; 534 535 void ip6_frag_init(struct inet_frag_queue *q, const void *a); 536 bool ip6_frag_match(const struct inet_frag_queue *q, const void *a); 537 538 /* 539 * Equivalent of ipv4 struct ip 540 */ 541 struct frag_queue { 542 struct inet_frag_queue q; 543 544 __be32 id; /* fragment id */ 545 u32 user; 546 struct in6_addr saddr; 547 struct in6_addr daddr; 548 549 int iif; 550 unsigned int csum; 551 __u16 nhoffset; 552 u8 ecn; 553 }; 554 555 void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq, 556 struct inet_frags *frags); 557 558 static inline bool ipv6_addr_any(const struct in6_addr *a) 559 { 560 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 561 const unsigned long *ul = (const unsigned long *)a; 562 563 return (ul[0] | ul[1]) == 0UL; 564 #else 565 return (a->s6_addr32[0] | a->s6_addr32[1] | 566 a->s6_addr32[2] | a->s6_addr32[3]) == 0; 567 #endif 568 } 569 570 static inline u32 ipv6_addr_hash(const struct in6_addr *a) 571 { 572 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 573 const unsigned long *ul = (const unsigned long *)a; 574 unsigned long x = ul[0] ^ ul[1]; 575 576 return (u32)(x ^ (x >> 32)); 577 #else 578 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^ 579 a->s6_addr32[2] ^ a->s6_addr32[3]); 580 #endif 581 } 582 583 /* more secured version of ipv6_addr_hash() */ 584 static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval) 585 { 586 u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1]; 587 588 return jhash_3words(v, 589 (__force u32)a->s6_addr32[2], 590 (__force u32)a->s6_addr32[3], 591 initval); 592 } 593 594 static inline bool ipv6_addr_loopback(const struct in6_addr *a) 595 { 596 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 597 const __be64 *be = (const __be64 *)a; 598 599 return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL; 600 #else 601 return (a->s6_addr32[0] | a->s6_addr32[1] | 602 a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0; 603 #endif 604 } 605 606 /* 607 * Note that we must __force cast these to unsigned long to make sparse happy, 608 * since all of the endian-annotated types are fixed size regardless of arch. 609 */ 610 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a) 611 { 612 return ( 613 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 614 *(unsigned long *)a | 615 #else 616 (__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) | 617 #endif 618 (__force unsigned long)(a->s6_addr32[2] ^ 619 cpu_to_be32(0x0000ffff))) == 0UL; 620 } 621 622 /* 623 * Check for a RFC 4843 ORCHID address 624 * (Overlay Routable Cryptographic Hash Identifiers) 625 */ 626 static inline bool ipv6_addr_orchid(const struct in6_addr *a) 627 { 628 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010); 629 } 630 631 static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr) 632 { 633 return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000); 634 } 635 636 static inline void ipv6_addr_set_v4mapped(const __be32 addr, 637 struct in6_addr *v4mapped) 638 { 639 ipv6_addr_set(v4mapped, 640 0, 0, 641 htonl(0x0000FFFF), 642 addr); 643 } 644 645 /* 646 * find the first different bit between two addresses 647 * length of address must be a multiple of 32bits 648 */ 649 static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen) 650 { 651 const __be32 *a1 = token1, *a2 = token2; 652 int i; 653 654 addrlen >>= 2; 655 656 for (i = 0; i < addrlen; i++) { 657 __be32 xb = a1[i] ^ a2[i]; 658 if (xb) 659 return i * 32 + 31 - __fls(ntohl(xb)); 660 } 661 662 /* 663 * we should *never* get to this point since that 664 * would mean the addrs are equal 665 * 666 * However, we do get to it 8) And exacly, when 667 * addresses are equal 8) 668 * 669 * ip route add 1111::/128 via ... 670 * ip route add 1111::/64 via ... 671 * and we are here. 672 * 673 * Ideally, this function should stop comparison 674 * at prefix length. It does not, but it is still OK, 675 * if returned value is greater than prefix length. 676 * --ANK (980803) 677 */ 678 return addrlen << 5; 679 } 680 681 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 682 static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen) 683 { 684 const __be64 *a1 = token1, *a2 = token2; 685 int i; 686 687 addrlen >>= 3; 688 689 for (i = 0; i < addrlen; i++) { 690 __be64 xb = a1[i] ^ a2[i]; 691 if (xb) 692 return i * 64 + 63 - __fls(be64_to_cpu(xb)); 693 } 694 695 return addrlen << 6; 696 } 697 #endif 698 699 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen) 700 { 701 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 702 if (__builtin_constant_p(addrlen) && !(addrlen & 7)) 703 return __ipv6_addr_diff64(token1, token2, addrlen); 704 #endif 705 return __ipv6_addr_diff32(token1, token2, addrlen); 706 } 707 708 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2) 709 { 710 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr)); 711 } 712 713 __be32 ipv6_select_ident(struct net *net, 714 const struct in6_addr *daddr, 715 const struct in6_addr *saddr); 716 void ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb); 717 718 int ip6_dst_hoplimit(struct dst_entry *dst); 719 720 static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6, 721 struct dst_entry *dst) 722 { 723 int hlimit; 724 725 if (ipv6_addr_is_multicast(&fl6->daddr)) 726 hlimit = np->mcast_hops; 727 else 728 hlimit = np->hop_limit; 729 if (hlimit < 0) 730 hlimit = ip6_dst_hoplimit(dst); 731 return hlimit; 732 } 733 734 /* copy IPv6 saddr & daddr to flow_keys, possibly using 64bit load/store 735 * Equivalent to : flow->v6addrs.src = iph->saddr; 736 * flow->v6addrs.dst = iph->daddr; 737 */ 738 static inline void iph_to_flow_copy_v6addrs(struct flow_keys *flow, 739 const struct ipv6hdr *iph) 740 { 741 BUILD_BUG_ON(offsetof(typeof(flow->addrs), v6addrs.dst) != 742 offsetof(typeof(flow->addrs), v6addrs.src) + 743 sizeof(flow->addrs.v6addrs.src)); 744 memcpy(&flow->addrs.v6addrs, &iph->saddr, sizeof(flow->addrs.v6addrs)); 745 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; 746 } 747 748 #if IS_ENABLED(CONFIG_IPV6) 749 750 /* Sysctl settings for net ipv6.auto_flowlabels */ 751 #define IP6_AUTO_FLOW_LABEL_OFF 0 752 #define IP6_AUTO_FLOW_LABEL_OPTOUT 1 753 #define IP6_AUTO_FLOW_LABEL_OPTIN 2 754 #define IP6_AUTO_FLOW_LABEL_FORCED 3 755 756 #define IP6_AUTO_FLOW_LABEL_MAX IP6_AUTO_FLOW_LABEL_FORCED 757 758 #define IP6_DEFAULT_AUTO_FLOW_LABELS IP6_AUTO_FLOW_LABEL_OPTOUT 759 760 static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb, 761 __be32 flowlabel, bool autolabel, 762 struct flowi6 *fl6) 763 { 764 u32 hash; 765 766 if (flowlabel || 767 net->ipv6.sysctl.auto_flowlabels == IP6_AUTO_FLOW_LABEL_OFF || 768 (!autolabel && 769 net->ipv6.sysctl.auto_flowlabels != IP6_AUTO_FLOW_LABEL_FORCED)) 770 return flowlabel; 771 772 hash = skb_get_hash_flowi6(skb, fl6); 773 774 /* Since this is being sent on the wire obfuscate hash a bit 775 * to minimize possbility that any useful information to an 776 * attacker is leaked. Only lower 20 bits are relevant. 777 */ 778 rol32(hash, 16); 779 780 flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK; 781 782 if (net->ipv6.sysctl.flowlabel_state_ranges) 783 flowlabel |= IPV6_FLOWLABEL_STATELESS_FLAG; 784 785 return flowlabel; 786 } 787 788 static inline int ip6_default_np_autolabel(struct net *net) 789 { 790 switch (net->ipv6.sysctl.auto_flowlabels) { 791 case IP6_AUTO_FLOW_LABEL_OFF: 792 case IP6_AUTO_FLOW_LABEL_OPTIN: 793 default: 794 return 0; 795 case IP6_AUTO_FLOW_LABEL_OPTOUT: 796 case IP6_AUTO_FLOW_LABEL_FORCED: 797 return 1; 798 } 799 } 800 #else 801 static inline void ip6_set_txhash(struct sock *sk) { } 802 static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb, 803 __be32 flowlabel, bool autolabel, 804 struct flowi6 *fl6) 805 { 806 return flowlabel; 807 } 808 static inline int ip6_default_np_autolabel(struct net *net) 809 { 810 return 0; 811 } 812 #endif 813 814 815 /* 816 * Header manipulation 817 */ 818 static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass, 819 __be32 flowlabel) 820 { 821 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel; 822 } 823 824 static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr) 825 { 826 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK; 827 } 828 829 static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr) 830 { 831 return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK; 832 } 833 834 static inline u8 ip6_tclass(__be32 flowinfo) 835 { 836 return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT; 837 } 838 839 static inline __be32 ip6_make_flowinfo(unsigned int tclass, __be32 flowlabel) 840 { 841 return htonl(tclass << IPV6_TCLASS_SHIFT) | flowlabel; 842 } 843 844 /* 845 * Prototypes exported by ipv6 846 */ 847 848 /* 849 * rcv function (called from netdevice level) 850 */ 851 852 int ipv6_rcv(struct sk_buff *skb, struct net_device *dev, 853 struct packet_type *pt, struct net_device *orig_dev); 854 855 int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 856 857 /* 858 * upper-layer output functions 859 */ 860 int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6, 861 struct ipv6_txoptions *opt, int tclass); 862 863 int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr); 864 865 int ip6_append_data(struct sock *sk, 866 int getfrag(void *from, char *to, int offset, int len, 867 int odd, struct sk_buff *skb), 868 void *from, int length, int transhdrlen, int hlimit, 869 int tclass, struct ipv6_txoptions *opt, struct flowi6 *fl6, 870 struct rt6_info *rt, unsigned int flags, int dontfrag); 871 872 int ip6_push_pending_frames(struct sock *sk); 873 874 void ip6_flush_pending_frames(struct sock *sk); 875 876 int ip6_send_skb(struct sk_buff *skb); 877 878 struct sk_buff *__ip6_make_skb(struct sock *sk, struct sk_buff_head *queue, 879 struct inet_cork_full *cork, 880 struct inet6_cork *v6_cork); 881 struct sk_buff *ip6_make_skb(struct sock *sk, 882 int getfrag(void *from, char *to, int offset, 883 int len, int odd, struct sk_buff *skb), 884 void *from, int length, int transhdrlen, 885 int hlimit, int tclass, struct ipv6_txoptions *opt, 886 struct flowi6 *fl6, struct rt6_info *rt, 887 unsigned int flags, int dontfrag); 888 889 static inline struct sk_buff *ip6_finish_skb(struct sock *sk) 890 { 891 return __ip6_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork, 892 &inet6_sk(sk)->cork); 893 } 894 895 int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst, 896 struct flowi6 *fl6); 897 struct dst_entry *ip6_dst_lookup_flow(const struct sock *sk, struct flowi6 *fl6, 898 const struct in6_addr *final_dst); 899 struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6, 900 const struct in6_addr *final_dst); 901 struct dst_entry *ip6_blackhole_route(struct net *net, 902 struct dst_entry *orig_dst); 903 904 /* 905 * skb processing functions 906 */ 907 908 int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb); 909 int ip6_forward(struct sk_buff *skb); 910 int ip6_input(struct sk_buff *skb); 911 int ip6_mc_input(struct sk_buff *skb); 912 913 int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); 914 int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); 915 916 /* 917 * Extension header (options) processing 918 */ 919 920 void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, 921 u8 *proto, struct in6_addr **daddr_p); 922 void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, 923 u8 *proto); 924 925 int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp, 926 __be16 *frag_offp); 927 928 bool ipv6_ext_hdr(u8 nexthdr); 929 930 enum { 931 IP6_FH_F_FRAG = (1 << 0), 932 IP6_FH_F_AUTH = (1 << 1), 933 IP6_FH_F_SKIP_RH = (1 << 2), 934 }; 935 936 /* find specified header and get offset to it */ 937 int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target, 938 unsigned short *fragoff, int *fragflg); 939 940 int ipv6_find_tlv(struct sk_buff *skb, int offset, int type); 941 942 struct in6_addr *fl6_update_dst(struct flowi6 *fl6, 943 const struct ipv6_txoptions *opt, 944 struct in6_addr *orig); 945 946 /* 947 * socket options (ipv6_sockglue.c) 948 */ 949 950 int ipv6_setsockopt(struct sock *sk, int level, int optname, 951 char __user *optval, unsigned int optlen); 952 int ipv6_getsockopt(struct sock *sk, int level, int optname, 953 char __user *optval, int __user *optlen); 954 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname, 955 char __user *optval, unsigned int optlen); 956 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname, 957 char __user *optval, int __user *optlen); 958 959 int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len); 960 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr, 961 int addr_len); 962 963 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, 964 int *addr_len); 965 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len, 966 int *addr_len); 967 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, 968 u32 info, u8 *payload); 969 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info); 970 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu); 971 972 int inet6_release(struct socket *sock); 973 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len); 974 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len, 975 int peer); 976 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg); 977 978 int inet6_hash_connect(struct inet_timewait_death_row *death_row, 979 struct sock *sk); 980 981 /* 982 * reassembly.c 983 */ 984 extern const struct proto_ops inet6_stream_ops; 985 extern const struct proto_ops inet6_dgram_ops; 986 987 struct group_source_req; 988 struct group_filter; 989 990 int ip6_mc_source(int add, int omode, struct sock *sk, 991 struct group_source_req *pgsr); 992 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf); 993 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 994 struct group_filter __user *optval, int __user *optlen); 995 996 #ifdef CONFIG_PROC_FS 997 int ac6_proc_init(struct net *net); 998 void ac6_proc_exit(struct net *net); 999 int raw6_proc_init(void); 1000 void raw6_proc_exit(void); 1001 int tcp6_proc_init(struct net *net); 1002 void tcp6_proc_exit(struct net *net); 1003 int udp6_proc_init(struct net *net); 1004 void udp6_proc_exit(struct net *net); 1005 int udplite6_proc_init(void); 1006 void udplite6_proc_exit(void); 1007 int ipv6_misc_proc_init(void); 1008 void ipv6_misc_proc_exit(void); 1009 int snmp6_register_dev(struct inet6_dev *idev); 1010 int snmp6_unregister_dev(struct inet6_dev *idev); 1011 1012 #else 1013 static inline int ac6_proc_init(struct net *net) { return 0; } 1014 static inline void ac6_proc_exit(struct net *net) { } 1015 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; } 1016 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; } 1017 #endif 1018 1019 #ifdef CONFIG_SYSCTL 1020 extern struct ctl_table ipv6_route_table_template[]; 1021 1022 struct ctl_table *ipv6_icmp_sysctl_init(struct net *net); 1023 struct ctl_table *ipv6_route_sysctl_init(struct net *net); 1024 int ipv6_sysctl_register(void); 1025 void ipv6_sysctl_unregister(void); 1026 #endif 1027 1028 int ipv6_sock_mc_join(struct sock *sk, int ifindex, 1029 const struct in6_addr *addr); 1030 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, 1031 const struct in6_addr *addr); 1032 #endif /* _NET_IPV6_H */ 1033