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 <linux/refcount.h> 20 #include <net/if_inet6.h> 21 #include <net/ndisc.h> 22 #include <net/flow.h> 23 #include <net/flow_dissector.h> 24 #include <net/snmp.h> 25 26 #define SIN6_LEN_RFC2133 24 27 28 #define IPV6_MAXPLEN 65535 29 30 /* 31 * NextHeader field of IPv6 header 32 */ 33 34 #define NEXTHDR_HOP 0 /* Hop-by-hop option header. */ 35 #define NEXTHDR_TCP 6 /* TCP segment. */ 36 #define NEXTHDR_UDP 17 /* UDP message. */ 37 #define NEXTHDR_IPV6 41 /* IPv6 in IPv6 */ 38 #define NEXTHDR_ROUTING 43 /* Routing header. */ 39 #define NEXTHDR_FRAGMENT 44 /* Fragmentation/reassembly header. */ 40 #define NEXTHDR_GRE 47 /* GRE header. */ 41 #define NEXTHDR_ESP 50 /* Encapsulating security payload. */ 42 #define NEXTHDR_AUTH 51 /* Authentication header. */ 43 #define NEXTHDR_ICMP 58 /* ICMP for IPv6. */ 44 #define NEXTHDR_NONE 59 /* No next header */ 45 #define NEXTHDR_DEST 60 /* Destination options header. */ 46 #define NEXTHDR_SCTP 132 /* SCTP message. */ 47 #define NEXTHDR_MOBILITY 135 /* Mobility header. */ 48 49 #define NEXTHDR_MAX 255 50 51 #define IPV6_DEFAULT_HOPLIMIT 64 52 #define IPV6_DEFAULT_MCASTHOPS 1 53 54 /* 55 * Addr type 56 * 57 * type - unicast | multicast 58 * scope - local | site | global 59 * v4 - compat 60 * v4mapped 61 * any 62 * loopback 63 */ 64 65 #define IPV6_ADDR_ANY 0x0000U 66 67 #define IPV6_ADDR_UNICAST 0x0001U 68 #define IPV6_ADDR_MULTICAST 0x0002U 69 70 #define IPV6_ADDR_LOOPBACK 0x0010U 71 #define IPV6_ADDR_LINKLOCAL 0x0020U 72 #define IPV6_ADDR_SITELOCAL 0x0040U 73 74 #define IPV6_ADDR_COMPATv4 0x0080U 75 76 #define IPV6_ADDR_SCOPE_MASK 0x00f0U 77 78 #define IPV6_ADDR_MAPPED 0x1000U 79 80 /* 81 * Addr scopes 82 */ 83 #define IPV6_ADDR_MC_SCOPE(a) \ 84 ((a)->s6_addr[1] & 0x0f) /* nonstandard */ 85 #define __IPV6_ADDR_SCOPE_INVALID -1 86 #define IPV6_ADDR_SCOPE_NODELOCAL 0x01 87 #define IPV6_ADDR_SCOPE_LINKLOCAL 0x02 88 #define IPV6_ADDR_SCOPE_SITELOCAL 0x05 89 #define IPV6_ADDR_SCOPE_ORGLOCAL 0x08 90 #define IPV6_ADDR_SCOPE_GLOBAL 0x0e 91 92 /* 93 * Addr flags 94 */ 95 #define IPV6_ADDR_MC_FLAG_TRANSIENT(a) \ 96 ((a)->s6_addr[1] & 0x10) 97 #define IPV6_ADDR_MC_FLAG_PREFIX(a) \ 98 ((a)->s6_addr[1] & 0x20) 99 #define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \ 100 ((a)->s6_addr[1] & 0x40) 101 102 /* 103 * fragmentation header 104 */ 105 106 struct frag_hdr { 107 __u8 nexthdr; 108 __u8 reserved; 109 __be16 frag_off; 110 __be32 identification; 111 }; 112 113 #define IP6_MF 0x0001 114 #define IP6_OFFSET 0xFFF8 115 116 #define IP6_REPLY_MARK(net, mark) \ 117 ((net)->ipv6.sysctl.fwmark_reflect ? (mark) : 0) 118 119 #include <net/sock.h> 120 121 /* sysctls */ 122 extern int sysctl_mld_max_msf; 123 extern int sysctl_mld_qrv; 124 125 #define _DEVINC(net, statname, mod, idev, field) \ 126 ({ \ 127 struct inet6_dev *_idev = (idev); \ 128 if (likely(_idev != NULL)) \ 129 mod##SNMP_INC_STATS64((_idev)->stats.statname, (field));\ 130 mod##SNMP_INC_STATS64((net)->mib.statname##_statistics, (field));\ 131 }) 132 133 /* per device counters are atomic_long_t */ 134 #define _DEVINCATOMIC(net, statname, mod, idev, field) \ 135 ({ \ 136 struct inet6_dev *_idev = (idev); \ 137 if (likely(_idev != NULL)) \ 138 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \ 139 mod##SNMP_INC_STATS((net)->mib.statname##_statistics, (field));\ 140 }) 141 142 /* per device and per net counters are atomic_long_t */ 143 #define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \ 144 ({ \ 145 struct inet6_dev *_idev = (idev); \ 146 if (likely(_idev != NULL)) \ 147 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \ 148 SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\ 149 }) 150 151 #define _DEVADD(net, statname, mod, idev, field, val) \ 152 ({ \ 153 struct inet6_dev *_idev = (idev); \ 154 if (likely(_idev != NULL)) \ 155 mod##SNMP_ADD_STATS((_idev)->stats.statname, (field), (val)); \ 156 mod##SNMP_ADD_STATS((net)->mib.statname##_statistics, (field), (val));\ 157 }) 158 159 #define _DEVUPD(net, statname, mod, idev, field, val) \ 160 ({ \ 161 struct inet6_dev *_idev = (idev); \ 162 if (likely(_idev != NULL)) \ 163 mod##SNMP_UPD_PO_STATS((_idev)->stats.statname, field, (val)); \ 164 mod##SNMP_UPD_PO_STATS((net)->mib.statname##_statistics, field, (val));\ 165 }) 166 167 /* MIBs */ 168 169 #define IP6_INC_STATS(net, idev,field) \ 170 _DEVINC(net, ipv6, , idev, field) 171 #define __IP6_INC_STATS(net, idev,field) \ 172 _DEVINC(net, ipv6, __, idev, field) 173 #define IP6_ADD_STATS(net, idev,field,val) \ 174 _DEVADD(net, ipv6, , idev, field, val) 175 #define __IP6_ADD_STATS(net, idev,field,val) \ 176 _DEVADD(net, ipv6, __, idev, field, val) 177 #define IP6_UPD_PO_STATS(net, idev,field,val) \ 178 _DEVUPD(net, ipv6, , idev, field, val) 179 #define __IP6_UPD_PO_STATS(net, idev,field,val) \ 180 _DEVUPD(net, ipv6, __, idev, field, val) 181 #define ICMP6_INC_STATS(net, idev, field) \ 182 _DEVINCATOMIC(net, icmpv6, , idev, field) 183 #define __ICMP6_INC_STATS(net, idev, field) \ 184 _DEVINCATOMIC(net, icmpv6, __, idev, field) 185 186 #define ICMP6MSGOUT_INC_STATS(net, idev, field) \ 187 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256) 188 #define ICMP6MSGIN_INC_STATS(net, idev, field) \ 189 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field) 190 191 struct ip6_ra_chain { 192 struct ip6_ra_chain *next; 193 struct sock *sk; 194 int sel; 195 void (*destructor)(struct sock *); 196 }; 197 198 extern struct ip6_ra_chain *ip6_ra_chain; 199 extern rwlock_t ip6_ra_lock; 200 201 /* 202 This structure is prepared by protocol, when parsing 203 ancillary data and passed to IPv6. 204 */ 205 206 struct ipv6_txoptions { 207 refcount_t refcnt; 208 /* Length of this structure */ 209 int tot_len; 210 211 /* length of extension headers */ 212 213 __u16 opt_flen; /* after fragment hdr */ 214 __u16 opt_nflen; /* before fragment hdr */ 215 216 struct ipv6_opt_hdr *hopopt; 217 struct ipv6_opt_hdr *dst0opt; 218 struct ipv6_rt_hdr *srcrt; /* Routing Header */ 219 struct ipv6_opt_hdr *dst1opt; 220 struct rcu_head rcu; 221 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */ 222 }; 223 224 struct ip6_flowlabel { 225 struct ip6_flowlabel __rcu *next; 226 __be32 label; 227 atomic_t users; 228 struct in6_addr dst; 229 struct ipv6_txoptions *opt; 230 unsigned long linger; 231 struct rcu_head rcu; 232 u8 share; 233 union { 234 struct pid *pid; 235 kuid_t uid; 236 } owner; 237 unsigned long lastuse; 238 unsigned long expires; 239 struct net *fl_net; 240 }; 241 242 #define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF) 243 #define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF) 244 #define IPV6_FLOWLABEL_STATELESS_FLAG cpu_to_be32(0x00080000) 245 246 #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK) 247 #define IPV6_TCLASS_SHIFT 20 248 249 struct ipv6_fl_socklist { 250 struct ipv6_fl_socklist __rcu *next; 251 struct ip6_flowlabel *fl; 252 struct rcu_head rcu; 253 }; 254 255 struct ipcm6_cookie { 256 __s16 hlimit; 257 __s16 tclass; 258 __s8 dontfrag; 259 struct ipv6_txoptions *opt; 260 }; 261 262 static inline struct ipv6_txoptions *txopt_get(const struct ipv6_pinfo *np) 263 { 264 struct ipv6_txoptions *opt; 265 266 rcu_read_lock(); 267 opt = rcu_dereference(np->opt); 268 if (opt) { 269 if (!refcount_inc_not_zero(&opt->refcnt)) 270 opt = NULL; 271 else 272 opt = rcu_pointer_handoff(opt); 273 } 274 rcu_read_unlock(); 275 return opt; 276 } 277 278 static inline void txopt_put(struct ipv6_txoptions *opt) 279 { 280 if (opt && refcount_dec_and_test(&opt->refcnt)) 281 kfree_rcu(opt, rcu); 282 } 283 284 struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label); 285 struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space, 286 struct ip6_flowlabel *fl, 287 struct ipv6_txoptions *fopt); 288 void fl6_free_socklist(struct sock *sk); 289 int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen); 290 int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq, 291 int flags); 292 int ip6_flowlabel_init(void); 293 void ip6_flowlabel_cleanup(void); 294 295 static inline void fl6_sock_release(struct ip6_flowlabel *fl) 296 { 297 if (fl) 298 atomic_dec(&fl->users); 299 } 300 301 void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info); 302 303 int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, 304 struct icmp6hdr *thdr, int len); 305 306 int ip6_ra_control(struct sock *sk, int sel); 307 308 int ipv6_parse_hopopts(struct sk_buff *skb); 309 310 struct ipv6_txoptions *ipv6_dup_options(struct sock *sk, 311 struct ipv6_txoptions *opt); 312 struct ipv6_txoptions *ipv6_renew_options(struct sock *sk, 313 struct ipv6_txoptions *opt, 314 int newtype, 315 struct ipv6_opt_hdr __user *newopt, 316 int newoptlen); 317 struct ipv6_txoptions * 318 ipv6_renew_options_kern(struct sock *sk, 319 struct ipv6_txoptions *opt, 320 int newtype, 321 struct ipv6_opt_hdr *newopt, 322 int newoptlen); 323 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space, 324 struct ipv6_txoptions *opt); 325 326 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb, 327 const struct inet6_skb_parm *opt); 328 struct ipv6_txoptions *ipv6_update_options(struct sock *sk, 329 struct ipv6_txoptions *opt); 330 331 static inline bool ipv6_accept_ra(struct inet6_dev *idev) 332 { 333 /* If forwarding is enabled, RA are not accepted unless the special 334 * hybrid mode (accept_ra=2) is enabled. 335 */ 336 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 : 337 idev->cnf.accept_ra; 338 } 339 340 #if IS_ENABLED(CONFIG_IPV6) 341 static inline int ip6_frag_mem(struct net *net) 342 { 343 return sum_frag_mem_limit(&net->ipv6.frags); 344 } 345 #endif 346 347 #define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */ 348 #define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */ 349 #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */ 350 351 int __ipv6_addr_type(const struct in6_addr *addr); 352 static inline int ipv6_addr_type(const struct in6_addr *addr) 353 { 354 return __ipv6_addr_type(addr) & 0xffff; 355 } 356 357 static inline int ipv6_addr_scope(const struct in6_addr *addr) 358 { 359 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK; 360 } 361 362 static inline int __ipv6_addr_src_scope(int type) 363 { 364 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16); 365 } 366 367 static inline int ipv6_addr_src_scope(const struct in6_addr *addr) 368 { 369 return __ipv6_addr_src_scope(__ipv6_addr_type(addr)); 370 } 371 372 static inline bool __ipv6_addr_needs_scope_id(int type) 373 { 374 return type & IPV6_ADDR_LINKLOCAL || 375 (type & IPV6_ADDR_MULTICAST && 376 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL))); 377 } 378 379 static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface) 380 { 381 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0; 382 } 383 384 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2) 385 { 386 return memcmp(a1, a2, sizeof(struct in6_addr)); 387 } 388 389 static inline bool 390 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m, 391 const struct in6_addr *a2) 392 { 393 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 394 const unsigned long *ul1 = (const unsigned long *)a1; 395 const unsigned long *ulm = (const unsigned long *)m; 396 const unsigned long *ul2 = (const unsigned long *)a2; 397 398 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) | 399 ((ul1[1] ^ ul2[1]) & ulm[1])); 400 #else 401 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) | 402 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) | 403 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) | 404 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3])); 405 #endif 406 } 407 408 static inline void ipv6_addr_prefix(struct in6_addr *pfx, 409 const struct in6_addr *addr, 410 int plen) 411 { 412 /* caller must guarantee 0 <= plen <= 128 */ 413 int o = plen >> 3, 414 b = plen & 0x7; 415 416 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr)); 417 memcpy(pfx->s6_addr, addr, o); 418 if (b != 0) 419 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b); 420 } 421 422 static inline void ipv6_addr_prefix_copy(struct in6_addr *addr, 423 const struct in6_addr *pfx, 424 int plen) 425 { 426 /* caller must guarantee 0 <= plen <= 128 */ 427 int o = plen >> 3, 428 b = plen & 0x7; 429 430 memcpy(addr->s6_addr, pfx, o); 431 if (b != 0) { 432 addr->s6_addr[o] &= ~(0xff00 >> b); 433 addr->s6_addr[o] |= (pfx->s6_addr[o] & (0xff00 >> b)); 434 } 435 } 436 437 static inline void __ipv6_addr_set_half(__be32 *addr, 438 __be32 wh, __be32 wl) 439 { 440 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 441 #if defined(__BIG_ENDIAN) 442 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) { 443 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl)); 444 return; 445 } 446 #elif defined(__LITTLE_ENDIAN) 447 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) { 448 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh)); 449 return; 450 } 451 #endif 452 #endif 453 addr[0] = wh; 454 addr[1] = wl; 455 } 456 457 static inline void ipv6_addr_set(struct in6_addr *addr, 458 __be32 w1, __be32 w2, 459 __be32 w3, __be32 w4) 460 { 461 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2); 462 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4); 463 } 464 465 static inline bool ipv6_addr_equal(const struct in6_addr *a1, 466 const struct in6_addr *a2) 467 { 468 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 469 const unsigned long *ul1 = (const unsigned long *)a1; 470 const unsigned long *ul2 = (const unsigned long *)a2; 471 472 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL; 473 #else 474 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) | 475 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) | 476 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) | 477 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0; 478 #endif 479 } 480 481 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 482 static inline bool __ipv6_prefix_equal64_half(const __be64 *a1, 483 const __be64 *a2, 484 unsigned int len) 485 { 486 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len)))) 487 return false; 488 return true; 489 } 490 491 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1, 492 const struct in6_addr *addr2, 493 unsigned int prefixlen) 494 { 495 const __be64 *a1 = (const __be64 *)addr1; 496 const __be64 *a2 = (const __be64 *)addr2; 497 498 if (prefixlen >= 64) { 499 if (a1[0] ^ a2[0]) 500 return false; 501 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64); 502 } 503 return __ipv6_prefix_equal64_half(a1, a2, prefixlen); 504 } 505 #else 506 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1, 507 const struct in6_addr *addr2, 508 unsigned int prefixlen) 509 { 510 const __be32 *a1 = addr1->s6_addr32; 511 const __be32 *a2 = addr2->s6_addr32; 512 unsigned int pdw, pbi; 513 514 /* check complete u32 in prefix */ 515 pdw = prefixlen >> 5; 516 if (pdw && memcmp(a1, a2, pdw << 2)) 517 return false; 518 519 /* check incomplete u32 in prefix */ 520 pbi = prefixlen & 0x1f; 521 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi)))) 522 return false; 523 524 return true; 525 } 526 #endif 527 528 struct inet_frag_queue; 529 530 enum ip6_defrag_users { 531 IP6_DEFRAG_LOCAL_DELIVER, 532 IP6_DEFRAG_CONNTRACK_IN, 533 __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX, 534 IP6_DEFRAG_CONNTRACK_OUT, 535 __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX, 536 IP6_DEFRAG_CONNTRACK_BRIDGE_IN, 537 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX, 538 }; 539 540 struct ip6_create_arg { 541 __be32 id; 542 u32 user; 543 const struct in6_addr *src; 544 const struct in6_addr *dst; 545 int iif; 546 u8 ecn; 547 }; 548 549 void ip6_frag_init(struct inet_frag_queue *q, const void *a); 550 bool ip6_frag_match(const struct inet_frag_queue *q, const void *a); 551 552 /* 553 * Equivalent of ipv4 struct ip 554 */ 555 struct frag_queue { 556 struct inet_frag_queue q; 557 558 __be32 id; /* fragment id */ 559 u32 user; 560 struct in6_addr saddr; 561 struct in6_addr daddr; 562 563 int iif; 564 unsigned int csum; 565 __u16 nhoffset; 566 u8 ecn; 567 }; 568 569 void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq, 570 struct inet_frags *frags); 571 572 static inline bool ipv6_addr_any(const struct in6_addr *a) 573 { 574 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 575 const unsigned long *ul = (const unsigned long *)a; 576 577 return (ul[0] | ul[1]) == 0UL; 578 #else 579 return (a->s6_addr32[0] | a->s6_addr32[1] | 580 a->s6_addr32[2] | a->s6_addr32[3]) == 0; 581 #endif 582 } 583 584 static inline u32 ipv6_addr_hash(const struct in6_addr *a) 585 { 586 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 587 const unsigned long *ul = (const unsigned long *)a; 588 unsigned long x = ul[0] ^ ul[1]; 589 590 return (u32)(x ^ (x >> 32)); 591 #else 592 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^ 593 a->s6_addr32[2] ^ a->s6_addr32[3]); 594 #endif 595 } 596 597 /* more secured version of ipv6_addr_hash() */ 598 static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval) 599 { 600 u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1]; 601 602 return jhash_3words(v, 603 (__force u32)a->s6_addr32[2], 604 (__force u32)a->s6_addr32[3], 605 initval); 606 } 607 608 static inline bool ipv6_addr_loopback(const struct in6_addr *a) 609 { 610 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 611 const __be64 *be = (const __be64 *)a; 612 613 return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL; 614 #else 615 return (a->s6_addr32[0] | a->s6_addr32[1] | 616 a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0; 617 #endif 618 } 619 620 /* 621 * Note that we must __force cast these to unsigned long to make sparse happy, 622 * since all of the endian-annotated types are fixed size regardless of arch. 623 */ 624 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a) 625 { 626 return ( 627 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 628 *(unsigned long *)a | 629 #else 630 (__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) | 631 #endif 632 (__force unsigned long)(a->s6_addr32[2] ^ 633 cpu_to_be32(0x0000ffff))) == 0UL; 634 } 635 636 /* 637 * Check for a RFC 4843 ORCHID address 638 * (Overlay Routable Cryptographic Hash Identifiers) 639 */ 640 static inline bool ipv6_addr_orchid(const struct in6_addr *a) 641 { 642 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010); 643 } 644 645 static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr) 646 { 647 return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000); 648 } 649 650 static inline void ipv6_addr_set_v4mapped(const __be32 addr, 651 struct in6_addr *v4mapped) 652 { 653 ipv6_addr_set(v4mapped, 654 0, 0, 655 htonl(0x0000FFFF), 656 addr); 657 } 658 659 /* 660 * find the first different bit between two addresses 661 * length of address must be a multiple of 32bits 662 */ 663 static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen) 664 { 665 const __be32 *a1 = token1, *a2 = token2; 666 int i; 667 668 addrlen >>= 2; 669 670 for (i = 0; i < addrlen; i++) { 671 __be32 xb = a1[i] ^ a2[i]; 672 if (xb) 673 return i * 32 + 31 - __fls(ntohl(xb)); 674 } 675 676 /* 677 * we should *never* get to this point since that 678 * would mean the addrs are equal 679 * 680 * However, we do get to it 8) And exacly, when 681 * addresses are equal 8) 682 * 683 * ip route add 1111::/128 via ... 684 * ip route add 1111::/64 via ... 685 * and we are here. 686 * 687 * Ideally, this function should stop comparison 688 * at prefix length. It does not, but it is still OK, 689 * if returned value is greater than prefix length. 690 * --ANK (980803) 691 */ 692 return addrlen << 5; 693 } 694 695 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 696 static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen) 697 { 698 const __be64 *a1 = token1, *a2 = token2; 699 int i; 700 701 addrlen >>= 3; 702 703 for (i = 0; i < addrlen; i++) { 704 __be64 xb = a1[i] ^ a2[i]; 705 if (xb) 706 return i * 64 + 63 - __fls(be64_to_cpu(xb)); 707 } 708 709 return addrlen << 6; 710 } 711 #endif 712 713 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen) 714 { 715 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 716 if (__builtin_constant_p(addrlen) && !(addrlen & 7)) 717 return __ipv6_addr_diff64(token1, token2, addrlen); 718 #endif 719 return __ipv6_addr_diff32(token1, token2, addrlen); 720 } 721 722 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2) 723 { 724 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr)); 725 } 726 727 __be32 ipv6_select_ident(struct net *net, 728 const struct in6_addr *daddr, 729 const struct in6_addr *saddr); 730 void ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb); 731 732 int ip6_dst_hoplimit(struct dst_entry *dst); 733 734 static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6, 735 struct dst_entry *dst) 736 { 737 int hlimit; 738 739 if (ipv6_addr_is_multicast(&fl6->daddr)) 740 hlimit = np->mcast_hops; 741 else 742 hlimit = np->hop_limit; 743 if (hlimit < 0) 744 hlimit = ip6_dst_hoplimit(dst); 745 return hlimit; 746 } 747 748 /* copy IPv6 saddr & daddr to flow_keys, possibly using 64bit load/store 749 * Equivalent to : flow->v6addrs.src = iph->saddr; 750 * flow->v6addrs.dst = iph->daddr; 751 */ 752 static inline void iph_to_flow_copy_v6addrs(struct flow_keys *flow, 753 const struct ipv6hdr *iph) 754 { 755 BUILD_BUG_ON(offsetof(typeof(flow->addrs), v6addrs.dst) != 756 offsetof(typeof(flow->addrs), v6addrs.src) + 757 sizeof(flow->addrs.v6addrs.src)); 758 memcpy(&flow->addrs.v6addrs, &iph->saddr, sizeof(flow->addrs.v6addrs)); 759 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; 760 } 761 762 #if IS_ENABLED(CONFIG_IPV6) 763 764 /* Sysctl settings for net ipv6.auto_flowlabels */ 765 #define IP6_AUTO_FLOW_LABEL_OFF 0 766 #define IP6_AUTO_FLOW_LABEL_OPTOUT 1 767 #define IP6_AUTO_FLOW_LABEL_OPTIN 2 768 #define IP6_AUTO_FLOW_LABEL_FORCED 3 769 770 #define IP6_AUTO_FLOW_LABEL_MAX IP6_AUTO_FLOW_LABEL_FORCED 771 772 #define IP6_DEFAULT_AUTO_FLOW_LABELS IP6_AUTO_FLOW_LABEL_OPTOUT 773 774 static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb, 775 __be32 flowlabel, bool autolabel, 776 struct flowi6 *fl6) 777 { 778 u32 hash; 779 780 /* @flowlabel may include more than a flow label, eg, the traffic class. 781 * Here we want only the flow label value. 782 */ 783 flowlabel &= IPV6_FLOWLABEL_MASK; 784 785 if (flowlabel || 786 net->ipv6.sysctl.auto_flowlabels == IP6_AUTO_FLOW_LABEL_OFF || 787 (!autolabel && 788 net->ipv6.sysctl.auto_flowlabels != IP6_AUTO_FLOW_LABEL_FORCED)) 789 return flowlabel; 790 791 hash = skb_get_hash_flowi6(skb, fl6); 792 793 /* Since this is being sent on the wire obfuscate hash a bit 794 * to minimize possbility that any useful information to an 795 * attacker is leaked. Only lower 20 bits are relevant. 796 */ 797 rol32(hash, 16); 798 799 flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK; 800 801 if (net->ipv6.sysctl.flowlabel_state_ranges) 802 flowlabel |= IPV6_FLOWLABEL_STATELESS_FLAG; 803 804 return flowlabel; 805 } 806 807 static inline int ip6_default_np_autolabel(struct net *net) 808 { 809 switch (net->ipv6.sysctl.auto_flowlabels) { 810 case IP6_AUTO_FLOW_LABEL_OFF: 811 case IP6_AUTO_FLOW_LABEL_OPTIN: 812 default: 813 return 0; 814 case IP6_AUTO_FLOW_LABEL_OPTOUT: 815 case IP6_AUTO_FLOW_LABEL_FORCED: 816 return 1; 817 } 818 } 819 #else 820 static inline void ip6_set_txhash(struct sock *sk) { } 821 static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb, 822 __be32 flowlabel, bool autolabel, 823 struct flowi6 *fl6) 824 { 825 return flowlabel; 826 } 827 static inline int ip6_default_np_autolabel(struct net *net) 828 { 829 return 0; 830 } 831 #endif 832 833 834 /* 835 * Header manipulation 836 */ 837 static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass, 838 __be32 flowlabel) 839 { 840 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel; 841 } 842 843 static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr) 844 { 845 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK; 846 } 847 848 static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr) 849 { 850 return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK; 851 } 852 853 static inline u8 ip6_tclass(__be32 flowinfo) 854 { 855 return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT; 856 } 857 858 static inline __be32 ip6_make_flowinfo(unsigned int tclass, __be32 flowlabel) 859 { 860 return htonl(tclass << IPV6_TCLASS_SHIFT) | flowlabel; 861 } 862 863 /* 864 * Prototypes exported by ipv6 865 */ 866 867 /* 868 * rcv function (called from netdevice level) 869 */ 870 871 int ipv6_rcv(struct sk_buff *skb, struct net_device *dev, 872 struct packet_type *pt, struct net_device *orig_dev); 873 874 int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 875 876 /* 877 * upper-layer output functions 878 */ 879 int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6, 880 __u32 mark, struct ipv6_txoptions *opt, int tclass); 881 882 int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr); 883 884 int ip6_append_data(struct sock *sk, 885 int getfrag(void *from, char *to, int offset, int len, 886 int odd, struct sk_buff *skb), 887 void *from, int length, int transhdrlen, 888 struct ipcm6_cookie *ipc6, struct flowi6 *fl6, 889 struct rt6_info *rt, unsigned int flags, 890 const struct sockcm_cookie *sockc); 891 892 int ip6_push_pending_frames(struct sock *sk); 893 894 void ip6_flush_pending_frames(struct sock *sk); 895 896 int ip6_send_skb(struct sk_buff *skb); 897 898 struct sk_buff *__ip6_make_skb(struct sock *sk, struct sk_buff_head *queue, 899 struct inet_cork_full *cork, 900 struct inet6_cork *v6_cork); 901 struct sk_buff *ip6_make_skb(struct sock *sk, 902 int getfrag(void *from, char *to, int offset, 903 int len, int odd, struct sk_buff *skb), 904 void *from, int length, int transhdrlen, 905 struct ipcm6_cookie *ipc6, struct flowi6 *fl6, 906 struct rt6_info *rt, unsigned int flags, 907 const struct sockcm_cookie *sockc); 908 909 static inline struct sk_buff *ip6_finish_skb(struct sock *sk) 910 { 911 return __ip6_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork, 912 &inet6_sk(sk)->cork); 913 } 914 915 int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst, 916 struct flowi6 *fl6); 917 struct dst_entry *ip6_dst_lookup_flow(const struct sock *sk, struct flowi6 *fl6, 918 const struct in6_addr *final_dst); 919 struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6, 920 const struct in6_addr *final_dst); 921 struct dst_entry *ip6_blackhole_route(struct net *net, 922 struct dst_entry *orig_dst); 923 924 /* 925 * skb processing functions 926 */ 927 928 int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb); 929 int ip6_forward(struct sk_buff *skb); 930 int ip6_input(struct sk_buff *skb); 931 int ip6_mc_input(struct sk_buff *skb); 932 933 int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); 934 int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); 935 936 /* 937 * Extension header (options) processing 938 */ 939 940 void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, 941 u8 *proto, struct in6_addr **daddr_p, 942 struct in6_addr *saddr); 943 void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, 944 u8 *proto); 945 946 int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp, 947 __be16 *frag_offp); 948 949 bool ipv6_ext_hdr(u8 nexthdr); 950 951 enum { 952 IP6_FH_F_FRAG = (1 << 0), 953 IP6_FH_F_AUTH = (1 << 1), 954 IP6_FH_F_SKIP_RH = (1 << 2), 955 }; 956 957 /* find specified header and get offset to it */ 958 int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target, 959 unsigned short *fragoff, int *fragflg); 960 961 int ipv6_find_tlv(const struct sk_buff *skb, int offset, int type); 962 963 struct in6_addr *fl6_update_dst(struct flowi6 *fl6, 964 const struct ipv6_txoptions *opt, 965 struct in6_addr *orig); 966 967 /* 968 * socket options (ipv6_sockglue.c) 969 */ 970 971 int ipv6_setsockopt(struct sock *sk, int level, int optname, 972 char __user *optval, unsigned int optlen); 973 int ipv6_getsockopt(struct sock *sk, int level, int optname, 974 char __user *optval, int __user *optlen); 975 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname, 976 char __user *optval, unsigned int optlen); 977 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname, 978 char __user *optval, int __user *optlen); 979 980 int __ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, 981 int addr_len); 982 int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len); 983 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr, 984 int addr_len); 985 int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr); 986 void ip6_datagram_release_cb(struct sock *sk); 987 988 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, 989 int *addr_len); 990 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len, 991 int *addr_len); 992 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, 993 u32 info, u8 *payload); 994 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info); 995 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu); 996 997 int inet6_release(struct socket *sock); 998 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len); 999 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len, 1000 int peer); 1001 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg); 1002 1003 int inet6_hash_connect(struct inet_timewait_death_row *death_row, 1004 struct sock *sk); 1005 1006 /* 1007 * reassembly.c 1008 */ 1009 extern const struct proto_ops inet6_stream_ops; 1010 extern const struct proto_ops inet6_dgram_ops; 1011 extern const struct proto_ops inet6_sockraw_ops; 1012 1013 struct group_source_req; 1014 struct group_filter; 1015 1016 int ip6_mc_source(int add, int omode, struct sock *sk, 1017 struct group_source_req *pgsr); 1018 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf); 1019 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 1020 struct group_filter __user *optval, int __user *optlen); 1021 1022 #ifdef CONFIG_PROC_FS 1023 int ac6_proc_init(struct net *net); 1024 void ac6_proc_exit(struct net *net); 1025 int raw6_proc_init(void); 1026 void raw6_proc_exit(void); 1027 int tcp6_proc_init(struct net *net); 1028 void tcp6_proc_exit(struct net *net); 1029 int udp6_proc_init(struct net *net); 1030 void udp6_proc_exit(struct net *net); 1031 int udplite6_proc_init(void); 1032 void udplite6_proc_exit(void); 1033 int ipv6_misc_proc_init(void); 1034 void ipv6_misc_proc_exit(void); 1035 int snmp6_register_dev(struct inet6_dev *idev); 1036 int snmp6_unregister_dev(struct inet6_dev *idev); 1037 1038 #else 1039 static inline int ac6_proc_init(struct net *net) { return 0; } 1040 static inline void ac6_proc_exit(struct net *net) { } 1041 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; } 1042 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; } 1043 #endif 1044 1045 #ifdef CONFIG_SYSCTL 1046 extern struct ctl_table ipv6_route_table_template[]; 1047 1048 struct ctl_table *ipv6_icmp_sysctl_init(struct net *net); 1049 struct ctl_table *ipv6_route_sysctl_init(struct net *net); 1050 int ipv6_sysctl_register(void); 1051 void ipv6_sysctl_unregister(void); 1052 #endif 1053 1054 int ipv6_sock_mc_join(struct sock *sk, int ifindex, 1055 const struct in6_addr *addr); 1056 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, 1057 const struct in6_addr *addr); 1058 #endif /* _NET_IPV6_H */ 1059