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_keys.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 105struct 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 */ 121extern int sysctl_mld_max_msf; 122extern 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 192struct ip6_ra_chain { 193 struct ip6_ra_chain *next; 194 struct sock *sk; 195 int sel; 196 void (*destructor)(struct sock *); 197}; 198 199extern struct ip6_ra_chain *ip6_ra_chain; 200extern 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 207struct 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 225struct 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_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK) 246#define IPV6_TCLASS_SHIFT 20 247 248struct ipv6_fl_socklist { 249 struct ipv6_fl_socklist __rcu *next; 250 struct ip6_flowlabel *fl; 251 struct rcu_head rcu; 252}; 253 254static inline struct ipv6_txoptions *txopt_get(const struct ipv6_pinfo *np) 255{ 256 struct ipv6_txoptions *opt; 257 258 rcu_read_lock(); 259 opt = rcu_dereference(np->opt); 260 if (opt && !atomic_inc_not_zero(&opt->refcnt)) 261 opt = NULL; 262 rcu_read_unlock(); 263 return opt; 264} 265 266static inline void txopt_put(struct ipv6_txoptions *opt) 267{ 268 if (opt && atomic_dec_and_test(&opt->refcnt)) 269 kfree_rcu(opt, rcu); 270} 271 272struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label); 273struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space, 274 struct ip6_flowlabel *fl, 275 struct ipv6_txoptions *fopt); 276void fl6_free_socklist(struct sock *sk); 277int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen); 278int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq, 279 int flags); 280int ip6_flowlabel_init(void); 281void ip6_flowlabel_cleanup(void); 282 283static inline void fl6_sock_release(struct ip6_flowlabel *fl) 284{ 285 if (fl) 286 atomic_dec(&fl->users); 287} 288 289void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info); 290 291int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, 292 struct icmp6hdr *thdr, int len); 293 294int ip6_ra_control(struct sock *sk, int sel); 295 296int ipv6_parse_hopopts(struct sk_buff *skb); 297 298struct ipv6_txoptions *ipv6_dup_options(struct sock *sk, 299 struct ipv6_txoptions *opt); 300struct ipv6_txoptions *ipv6_renew_options(struct sock *sk, 301 struct ipv6_txoptions *opt, 302 int newtype, 303 struct ipv6_opt_hdr __user *newopt, 304 int newoptlen); 305struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space, 306 struct ipv6_txoptions *opt); 307 308bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb, 309 const struct inet6_skb_parm *opt); 310 311static inline bool ipv6_accept_ra(struct inet6_dev *idev) 312{ 313 /* If forwarding is enabled, RA are not accepted unless the special 314 * hybrid mode (accept_ra=2) is enabled. 315 */ 316 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 : 317 idev->cnf.accept_ra; 318} 319 320#if IS_ENABLED(CONFIG_IPV6) 321static inline int ip6_frag_mem(struct net *net) 322{ 323 return sum_frag_mem_limit(&net->ipv6.frags); 324} 325#endif 326 327#define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */ 328#define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */ 329#define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */ 330 331int __ipv6_addr_type(const struct in6_addr *addr); 332static inline int ipv6_addr_type(const struct in6_addr *addr) 333{ 334 return __ipv6_addr_type(addr) & 0xffff; 335} 336 337static inline int ipv6_addr_scope(const struct in6_addr *addr) 338{ 339 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK; 340} 341 342static inline int __ipv6_addr_src_scope(int type) 343{ 344 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16); 345} 346 347static inline int ipv6_addr_src_scope(const struct in6_addr *addr) 348{ 349 return __ipv6_addr_src_scope(__ipv6_addr_type(addr)); 350} 351 352static inline bool __ipv6_addr_needs_scope_id(int type) 353{ 354 return type & IPV6_ADDR_LINKLOCAL || 355 (type & IPV6_ADDR_MULTICAST && 356 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL))); 357} 358 359static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface) 360{ 361 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0; 362} 363 364static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2) 365{ 366 return memcmp(a1, a2, sizeof(struct in6_addr)); 367} 368 369static inline bool 370ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m, 371 const struct in6_addr *a2) 372{ 373#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 374 const unsigned long *ul1 = (const unsigned long *)a1; 375 const unsigned long *ulm = (const unsigned long *)m; 376 const unsigned long *ul2 = (const unsigned long *)a2; 377 378 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) | 379 ((ul1[1] ^ ul2[1]) & ulm[1])); 380#else 381 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) | 382 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) | 383 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) | 384 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3])); 385#endif 386} 387 388static inline void ipv6_addr_prefix(struct in6_addr *pfx, 389 const struct in6_addr *addr, 390 int plen) 391{ 392 /* caller must guarantee 0 <= plen <= 128 */ 393 int o = plen >> 3, 394 b = plen & 0x7; 395 396 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr)); 397 memcpy(pfx->s6_addr, addr, o); 398 if (b != 0) 399 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b); 400} 401 402static inline void __ipv6_addr_set_half(__be32 *addr, 403 __be32 wh, __be32 wl) 404{ 405#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 406#if defined(__BIG_ENDIAN) 407 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) { 408 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl)); 409 return; 410 } 411#elif defined(__LITTLE_ENDIAN) 412 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) { 413 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh)); 414 return; 415 } 416#endif 417#endif 418 addr[0] = wh; 419 addr[1] = wl; 420} 421 422static inline void ipv6_addr_set(struct in6_addr *addr, 423 __be32 w1, __be32 w2, 424 __be32 w3, __be32 w4) 425{ 426 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2); 427 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4); 428} 429 430static inline bool ipv6_addr_equal(const struct in6_addr *a1, 431 const struct in6_addr *a2) 432{ 433#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 434 const unsigned long *ul1 = (const unsigned long *)a1; 435 const unsigned long *ul2 = (const unsigned long *)a2; 436 437 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL; 438#else 439 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) | 440 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) | 441 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) | 442 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0; 443#endif 444} 445 446#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 447static inline bool __ipv6_prefix_equal64_half(const __be64 *a1, 448 const __be64 *a2, 449 unsigned int len) 450{ 451 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len)))) 452 return false; 453 return true; 454} 455 456static inline bool ipv6_prefix_equal(const struct in6_addr *addr1, 457 const struct in6_addr *addr2, 458 unsigned int prefixlen) 459{ 460 const __be64 *a1 = (const __be64 *)addr1; 461 const __be64 *a2 = (const __be64 *)addr2; 462 463 if (prefixlen >= 64) { 464 if (a1[0] ^ a2[0]) 465 return false; 466 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64); 467 } 468 return __ipv6_prefix_equal64_half(a1, a2, prefixlen); 469} 470#else 471static inline bool ipv6_prefix_equal(const struct in6_addr *addr1, 472 const struct in6_addr *addr2, 473 unsigned int prefixlen) 474{ 475 const __be32 *a1 = addr1->s6_addr32; 476 const __be32 *a2 = addr2->s6_addr32; 477 unsigned int pdw, pbi; 478 479 /* check complete u32 in prefix */ 480 pdw = prefixlen >> 5; 481 if (pdw && memcmp(a1, a2, pdw << 2)) 482 return false; 483 484 /* check incomplete u32 in prefix */ 485 pbi = prefixlen & 0x1f; 486 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi)))) 487 return false; 488 489 return true; 490} 491#endif 492 493struct inet_frag_queue; 494 495enum ip6_defrag_users { 496 IP6_DEFRAG_LOCAL_DELIVER, 497 IP6_DEFRAG_CONNTRACK_IN, 498 __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX, 499 IP6_DEFRAG_CONNTRACK_OUT, 500 __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX, 501 IP6_DEFRAG_CONNTRACK_BRIDGE_IN, 502 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX, 503}; 504 505struct ip6_create_arg { 506 __be32 id; 507 u32 user; 508 const struct in6_addr *src; 509 const struct in6_addr *dst; 510 int iif; 511 u8 ecn; 512}; 513 514void ip6_frag_init(struct inet_frag_queue *q, const void *a); 515bool ip6_frag_match(const struct inet_frag_queue *q, const void *a); 516 517/* 518 * Equivalent of ipv4 struct ip 519 */ 520struct frag_queue { 521 struct inet_frag_queue q; 522 523 __be32 id; /* fragment id */ 524 u32 user; 525 struct in6_addr saddr; 526 struct in6_addr daddr; 527 528 int iif; 529 unsigned int csum; 530 __u16 nhoffset; 531 u8 ecn; 532}; 533 534void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq, 535 struct inet_frags *frags); 536 537static inline bool ipv6_addr_any(const struct in6_addr *a) 538{ 539#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 540 const unsigned long *ul = (const unsigned long *)a; 541 542 return (ul[0] | ul[1]) == 0UL; 543#else 544 return (a->s6_addr32[0] | a->s6_addr32[1] | 545 a->s6_addr32[2] | a->s6_addr32[3]) == 0; 546#endif 547} 548 549static inline u32 ipv6_addr_hash(const struct in6_addr *a) 550{ 551#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 552 const unsigned long *ul = (const unsigned long *)a; 553 unsigned long x = ul[0] ^ ul[1]; 554 555 return (u32)(x ^ (x >> 32)); 556#else 557 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^ 558 a->s6_addr32[2] ^ a->s6_addr32[3]); 559#endif 560} 561 562/* more secured version of ipv6_addr_hash() */ 563static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval) 564{ 565 u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1]; 566 567 return jhash_3words(v, 568 (__force u32)a->s6_addr32[2], 569 (__force u32)a->s6_addr32[3], 570 initval); 571} 572 573static inline bool ipv6_addr_loopback(const struct in6_addr *a) 574{ 575#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 576 const __be64 *be = (const __be64 *)a; 577 578 return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL; 579#else 580 return (a->s6_addr32[0] | a->s6_addr32[1] | 581 a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0; 582#endif 583} 584 585/* 586 * Note that we must __force cast these to unsigned long to make sparse happy, 587 * since all of the endian-annotated types are fixed size regardless of arch. 588 */ 589static inline bool ipv6_addr_v4mapped(const struct in6_addr *a) 590{ 591 return ( 592#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 593 *(unsigned long *)a | 594#else 595 (__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) | 596#endif 597 (__force unsigned long)(a->s6_addr32[2] ^ 598 cpu_to_be32(0x0000ffff))) == 0UL; 599} 600 601/* 602 * Check for a RFC 4843 ORCHID address 603 * (Overlay Routable Cryptographic Hash Identifiers) 604 */ 605static inline bool ipv6_addr_orchid(const struct in6_addr *a) 606{ 607 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010); 608} 609 610static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr) 611{ 612 return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000); 613} 614 615static inline void ipv6_addr_set_v4mapped(const __be32 addr, 616 struct in6_addr *v4mapped) 617{ 618 ipv6_addr_set(v4mapped, 619 0, 0, 620 htonl(0x0000FFFF), 621 addr); 622} 623 624/* 625 * find the first different bit between two addresses 626 * length of address must be a multiple of 32bits 627 */ 628static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen) 629{ 630 const __be32 *a1 = token1, *a2 = token2; 631 int i; 632 633 addrlen >>= 2; 634 635 for (i = 0; i < addrlen; i++) { 636 __be32 xb = a1[i] ^ a2[i]; 637 if (xb) 638 return i * 32 + 31 - __fls(ntohl(xb)); 639 } 640 641 /* 642 * we should *never* get to this point since that 643 * would mean the addrs are equal 644 * 645 * However, we do get to it 8) And exacly, when 646 * addresses are equal 8) 647 * 648 * ip route add 1111::/128 via ... 649 * ip route add 1111::/64 via ... 650 * and we are here. 651 * 652 * Ideally, this function should stop comparison 653 * at prefix length. It does not, but it is still OK, 654 * if returned value is greater than prefix length. 655 * --ANK (980803) 656 */ 657 return addrlen << 5; 658} 659 660#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 661static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen) 662{ 663 const __be64 *a1 = token1, *a2 = token2; 664 int i; 665 666 addrlen >>= 3; 667 668 for (i = 0; i < addrlen; i++) { 669 __be64 xb = a1[i] ^ a2[i]; 670 if (xb) 671 return i * 64 + 63 - __fls(be64_to_cpu(xb)); 672 } 673 674 return addrlen << 6; 675} 676#endif 677 678static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen) 679{ 680#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 681 if (__builtin_constant_p(addrlen) && !(addrlen & 7)) 682 return __ipv6_addr_diff64(token1, token2, addrlen); 683#endif 684 return __ipv6_addr_diff32(token1, token2, addrlen); 685} 686 687static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2) 688{ 689 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr)); 690} 691 692void ipv6_select_ident(struct net *net, struct frag_hdr *fhdr, 693 struct rt6_info *rt); 694void ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb); 695 696int ip6_dst_hoplimit(struct dst_entry *dst); 697 698static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6, 699 struct dst_entry *dst) 700{ 701 int hlimit; 702 703 if (ipv6_addr_is_multicast(&fl6->daddr)) 704 hlimit = np->mcast_hops; 705 else 706 hlimit = np->hop_limit; 707 if (hlimit < 0) 708 hlimit = ip6_dst_hoplimit(dst); 709 return hlimit; 710} 711 712#if IS_ENABLED(CONFIG_IPV6) 713static inline void ip6_set_txhash(struct sock *sk) 714{ 715 struct inet_sock *inet = inet_sk(sk); 716 struct ipv6_pinfo *np = inet6_sk(sk); 717 struct flow_keys keys; 718 719 keys.src = (__force __be32)ipv6_addr_hash(&np->saddr); 720 keys.dst = (__force __be32)ipv6_addr_hash(&sk->sk_v6_daddr); 721 keys.port16[0] = inet->inet_sport; 722 keys.port16[1] = inet->inet_dport; 723 724 sk->sk_txhash = flow_hash_from_keys(&keys); 725} 726 727static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb, 728 __be32 flowlabel, bool autolabel) 729{ 730 if (!flowlabel && (autolabel || net->ipv6.sysctl.auto_flowlabels)) { 731 u32 hash; 732 733 hash = skb_get_hash(skb); 734 735 /* Since this is being sent on the wire obfuscate hash a bit 736 * to minimize possbility that any useful information to an 737 * attacker is leaked. Only lower 20 bits are relevant. 738 */ 739 hash ^= hash >> 12; 740 741 flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK; 742 } 743 744 return flowlabel; 745} 746#else 747static inline void ip6_set_txhash(struct sock *sk) { } 748static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb, 749 __be32 flowlabel, bool autolabel) 750{ 751 return flowlabel; 752} 753#endif 754 755 756/* 757 * Header manipulation 758 */ 759static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass, 760 __be32 flowlabel) 761{ 762 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel; 763} 764 765static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr) 766{ 767 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK; 768} 769 770static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr) 771{ 772 return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK; 773} 774 775static inline u8 ip6_tclass(__be32 flowinfo) 776{ 777 return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT; 778} 779/* 780 * Prototypes exported by ipv6 781 */ 782 783/* 784 * rcv function (called from netdevice level) 785 */ 786 787int ipv6_rcv(struct sk_buff *skb, struct net_device *dev, 788 struct packet_type *pt, struct net_device *orig_dev); 789 790int ip6_rcv_finish(struct sock *sk, struct sk_buff *skb); 791 792/* 793 * upper-layer output functions 794 */ 795int ip6_xmit(struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6, 796 struct ipv6_txoptions *opt, int tclass); 797 798int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr); 799 800int ip6_append_data(struct sock *sk, 801 int getfrag(void *from, char *to, int offset, int len, 802 int odd, struct sk_buff *skb), 803 void *from, int length, int transhdrlen, int hlimit, 804 int tclass, struct ipv6_txoptions *opt, struct flowi6 *fl6, 805 struct rt6_info *rt, unsigned int flags, int dontfrag); 806 807int ip6_push_pending_frames(struct sock *sk); 808 809void ip6_flush_pending_frames(struct sock *sk); 810 811int ip6_send_skb(struct sk_buff *skb); 812 813struct sk_buff *__ip6_make_skb(struct sock *sk, struct sk_buff_head *queue, 814 struct inet_cork_full *cork, 815 struct inet6_cork *v6_cork); 816struct sk_buff *ip6_make_skb(struct sock *sk, 817 int getfrag(void *from, char *to, int offset, 818 int len, int odd, struct sk_buff *skb), 819 void *from, int length, int transhdrlen, 820 int hlimit, int tclass, struct ipv6_txoptions *opt, 821 struct flowi6 *fl6, struct rt6_info *rt, 822 unsigned int flags, int dontfrag); 823 824static inline struct sk_buff *ip6_finish_skb(struct sock *sk) 825{ 826 return __ip6_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork, 827 &inet6_sk(sk)->cork); 828} 829 830int ip6_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi6 *fl6); 831struct dst_entry *ip6_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6, 832 const struct in6_addr *final_dst); 833struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6, 834 const struct in6_addr *final_dst); 835struct dst_entry *ip6_blackhole_route(struct net *net, 836 struct dst_entry *orig_dst); 837 838/* 839 * skb processing functions 840 */ 841 842int ip6_output(struct sock *sk, struct sk_buff *skb); 843int ip6_forward(struct sk_buff *skb); 844int ip6_input(struct sk_buff *skb); 845int ip6_mc_input(struct sk_buff *skb); 846 847int __ip6_local_out(struct sk_buff *skb); 848int ip6_local_out_sk(struct sock *sk, struct sk_buff *skb); 849int ip6_local_out(struct sk_buff *skb); 850 851/* 852 * Extension header (options) processing 853 */ 854 855void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, 856 u8 *proto, struct in6_addr **daddr_p); 857void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, 858 u8 *proto); 859 860int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp, 861 __be16 *frag_offp); 862 863bool ipv6_ext_hdr(u8 nexthdr); 864 865enum { 866 IP6_FH_F_FRAG = (1 << 0), 867 IP6_FH_F_AUTH = (1 << 1), 868 IP6_FH_F_SKIP_RH = (1 << 2), 869}; 870 871/* find specified header and get offset to it */ 872int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target, 873 unsigned short *fragoff, int *fragflg); 874 875int ipv6_find_tlv(struct sk_buff *skb, int offset, int type); 876 877struct in6_addr *fl6_update_dst(struct flowi6 *fl6, 878 const struct ipv6_txoptions *opt, 879 struct in6_addr *orig); 880 881/* 882 * socket options (ipv6_sockglue.c) 883 */ 884 885int ipv6_setsockopt(struct sock *sk, int level, int optname, 886 char __user *optval, unsigned int optlen); 887int ipv6_getsockopt(struct sock *sk, int level, int optname, 888 char __user *optval, int __user *optlen); 889int compat_ipv6_setsockopt(struct sock *sk, int level, int optname, 890 char __user *optval, unsigned int optlen); 891int compat_ipv6_getsockopt(struct sock *sk, int level, int optname, 892 char __user *optval, int __user *optlen); 893 894int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len); 895int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr, 896 int addr_len); 897 898int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, 899 int *addr_len); 900int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len, 901 int *addr_len); 902void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, 903 u32 info, u8 *payload); 904void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info); 905void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu); 906 907int inet6_release(struct socket *sock); 908int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len); 909int inet6_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len, 910 int peer); 911int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg); 912 913int inet6_hash_connect(struct inet_timewait_death_row *death_row, 914 struct sock *sk); 915 916/* 917 * reassembly.c 918 */ 919extern const struct proto_ops inet6_stream_ops; 920extern const struct proto_ops inet6_dgram_ops; 921 922struct group_source_req; 923struct group_filter; 924 925int ip6_mc_source(int add, int omode, struct sock *sk, 926 struct group_source_req *pgsr); 927int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf); 928int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 929 struct group_filter __user *optval, int __user *optlen); 930 931#ifdef CONFIG_PROC_FS 932int ac6_proc_init(struct net *net); 933void ac6_proc_exit(struct net *net); 934int raw6_proc_init(void); 935void raw6_proc_exit(void); 936int tcp6_proc_init(struct net *net); 937void tcp6_proc_exit(struct net *net); 938int udp6_proc_init(struct net *net); 939void udp6_proc_exit(struct net *net); 940int udplite6_proc_init(void); 941void udplite6_proc_exit(void); 942int ipv6_misc_proc_init(void); 943void ipv6_misc_proc_exit(void); 944int snmp6_register_dev(struct inet6_dev *idev); 945int snmp6_unregister_dev(struct inet6_dev *idev); 946 947#else 948static inline int ac6_proc_init(struct net *net) { return 0; } 949static inline void ac6_proc_exit(struct net *net) { } 950static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; } 951static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; } 952#endif 953 954#ifdef CONFIG_SYSCTL 955extern struct ctl_table ipv6_route_table_template[]; 956 957struct ctl_table *ipv6_icmp_sysctl_init(struct net *net); 958struct ctl_table *ipv6_route_sysctl_init(struct net *net); 959int ipv6_sysctl_register(void); 960void ipv6_sysctl_unregister(void); 961#endif 962 963int ipv6_sock_mc_join(struct sock *sk, int ifindex, 964 const struct in6_addr *addr); 965int ipv6_sock_mc_drop(struct sock *sk, int ifindex, 966 const struct in6_addr *addr); 967#endif /* _NET_IPV6_H */ 968