1/* SPDX-License-Identifier: GPL-2.0-or-later */ 2/* 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 */ 8 9#ifndef _NET_IPV6_H 10#define _NET_IPV6_H 11 12#include <linux/ipv6.h> 13#include <linux/hardirq.h> 14#include <linux/jhash.h> 15#include <linux/refcount.h> 16#include <linux/jump_label_ratelimit.h> 17#include <net/if_inet6.h> 18#include <net/ndisc.h> 19#include <net/flow.h> 20#include <net/flow_dissector.h> 21#include <net/snmp.h> 22#include <net/netns/hash.h> 23 24#define SIN6_LEN_RFC2133 24 25 26#define IPV6_MAXPLEN 65535 27 28/* 29 * NextHeader field of IPv6 header 30 */ 31 32#define NEXTHDR_HOP 0 /* Hop-by-hop option header. */ 33#define NEXTHDR_TCP 6 /* TCP segment. */ 34#define NEXTHDR_UDP 17 /* UDP message. */ 35#define NEXTHDR_IPV6 41 /* IPv6 in IPv6 */ 36#define NEXTHDR_ROUTING 43 /* Routing header. */ 37#define NEXTHDR_FRAGMENT 44 /* Fragmentation/reassembly header. */ 38#define NEXTHDR_GRE 47 /* GRE header. */ 39#define NEXTHDR_ESP 50 /* Encapsulating security payload. */ 40#define NEXTHDR_AUTH 51 /* Authentication header. */ 41#define NEXTHDR_ICMP 58 /* ICMP for IPv6. */ 42#define NEXTHDR_NONE 59 /* No next header */ 43#define NEXTHDR_DEST 60 /* Destination options header. */ 44#define NEXTHDR_SCTP 132 /* SCTP message. */ 45#define NEXTHDR_MOBILITY 135 /* Mobility header. */ 46 47#define NEXTHDR_MAX 255 48 49#define IPV6_DEFAULT_HOPLIMIT 64 50#define IPV6_DEFAULT_MCASTHOPS 1 51 52/* Limits on Hop-by-Hop and Destination options. 53 * 54 * Per RFC8200 there is no limit on the maximum number or lengths of options in 55 * Hop-by-Hop or Destination options other then the packet must fit in an MTU. 56 * We allow configurable limits in order to mitigate potential denial of 57 * service attacks. 58 * 59 * There are three limits that may be set: 60 * - Limit the number of options in a Hop-by-Hop or Destination options 61 * extension header 62 * - Limit the byte length of a Hop-by-Hop or Destination options extension 63 * header 64 * - Disallow unknown options 65 * 66 * The limits are expressed in corresponding sysctls: 67 * 68 * ipv6.sysctl.max_dst_opts_cnt 69 * ipv6.sysctl.max_hbh_opts_cnt 70 * ipv6.sysctl.max_dst_opts_len 71 * ipv6.sysctl.max_hbh_opts_len 72 * 73 * max_*_opts_cnt is the number of TLVs that are allowed for Destination 74 * options or Hop-by-Hop options. If the number is less than zero then unknown 75 * TLVs are disallowed and the number of known options that are allowed is the 76 * absolute value. Setting the value to INT_MAX indicates no limit. 77 * 78 * max_*_opts_len is the length limit in bytes of a Destination or 79 * Hop-by-Hop options extension header. Setting the value to INT_MAX 80 * indicates no length limit. 81 * 82 * If a limit is exceeded when processing an extension header the packet is 83 * silently discarded. 84 */ 85 86/* Default limits for Hop-by-Hop and Destination options */ 87#define IP6_DEFAULT_MAX_DST_OPTS_CNT 8 88#define IP6_DEFAULT_MAX_HBH_OPTS_CNT 8 89#define IP6_DEFAULT_MAX_DST_OPTS_LEN INT_MAX /* No limit */ 90#define IP6_DEFAULT_MAX_HBH_OPTS_LEN INT_MAX /* No limit */ 91 92/* 93 * Addr type 94 * 95 * type - unicast | multicast 96 * scope - local | site | global 97 * v4 - compat 98 * v4mapped 99 * any 100 * loopback 101 */ 102 103#define IPV6_ADDR_ANY 0x0000U 104 105#define IPV6_ADDR_UNICAST 0x0001U 106#define IPV6_ADDR_MULTICAST 0x0002U 107 108#define IPV6_ADDR_LOOPBACK 0x0010U 109#define IPV6_ADDR_LINKLOCAL 0x0020U 110#define IPV6_ADDR_SITELOCAL 0x0040U 111 112#define IPV6_ADDR_COMPATv4 0x0080U 113 114#define IPV6_ADDR_SCOPE_MASK 0x00f0U 115 116#define IPV6_ADDR_MAPPED 0x1000U 117 118/* 119 * Addr scopes 120 */ 121#define IPV6_ADDR_MC_SCOPE(a) \ 122 ((a)->s6_addr[1] & 0x0f) /* nonstandard */ 123#define __IPV6_ADDR_SCOPE_INVALID -1 124#define IPV6_ADDR_SCOPE_NODELOCAL 0x01 125#define IPV6_ADDR_SCOPE_LINKLOCAL 0x02 126#define IPV6_ADDR_SCOPE_SITELOCAL 0x05 127#define IPV6_ADDR_SCOPE_ORGLOCAL 0x08 128#define IPV6_ADDR_SCOPE_GLOBAL 0x0e 129 130/* 131 * Addr flags 132 */ 133#define IPV6_ADDR_MC_FLAG_TRANSIENT(a) \ 134 ((a)->s6_addr[1] & 0x10) 135#define IPV6_ADDR_MC_FLAG_PREFIX(a) \ 136 ((a)->s6_addr[1] & 0x20) 137#define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \ 138 ((a)->s6_addr[1] & 0x40) 139 140/* 141 * fragmentation header 142 */ 143 144struct frag_hdr { 145 __u8 nexthdr; 146 __u8 reserved; 147 __be16 frag_off; 148 __be32 identification; 149}; 150 151#define IP6_MF 0x0001 152#define IP6_OFFSET 0xFFF8 153 154struct ip6_fraglist_iter { 155 struct ipv6hdr *tmp_hdr; 156 struct sk_buff *frag; 157 int offset; 158 unsigned int hlen; 159 __be32 frag_id; 160 u8 nexthdr; 161}; 162 163int ip6_fraglist_init(struct sk_buff *skb, unsigned int hlen, u8 *prevhdr, 164 u8 nexthdr, __be32 frag_id, 165 struct ip6_fraglist_iter *iter); 166void ip6_fraglist_prepare(struct sk_buff *skb, struct ip6_fraglist_iter *iter); 167 168static inline struct sk_buff *ip6_fraglist_next(struct ip6_fraglist_iter *iter) 169{ 170 struct sk_buff *skb = iter->frag; 171 172 iter->frag = skb->next; 173 skb_mark_not_on_list(skb); 174 175 return skb; 176} 177 178struct ip6_frag_state { 179 u8 *prevhdr; 180 unsigned int hlen; 181 unsigned int mtu; 182 unsigned int left; 183 int offset; 184 int ptr; 185 int hroom; 186 int troom; 187 __be32 frag_id; 188 u8 nexthdr; 189}; 190 191void ip6_frag_init(struct sk_buff *skb, unsigned int hlen, unsigned int mtu, 192 unsigned short needed_tailroom, int hdr_room, u8 *prevhdr, 193 u8 nexthdr, __be32 frag_id, struct ip6_frag_state *state); 194struct sk_buff *ip6_frag_next(struct sk_buff *skb, 195 struct ip6_frag_state *state); 196 197#define IP6_REPLY_MARK(net, mark) \ 198 ((net)->ipv6.sysctl.fwmark_reflect ? (mark) : 0) 199 200#include <net/sock.h> 201 202/* sysctls */ 203extern int sysctl_mld_max_msf; 204extern int sysctl_mld_qrv; 205 206#define _DEVINC(net, statname, mod, idev, field) \ 207({ \ 208 struct inet6_dev *_idev = (idev); \ 209 if (likely(_idev != NULL)) \ 210 mod##SNMP_INC_STATS64((_idev)->stats.statname, (field));\ 211 mod##SNMP_INC_STATS64((net)->mib.statname##_statistics, (field));\ 212}) 213 214/* per device counters are atomic_long_t */ 215#define _DEVINCATOMIC(net, statname, mod, idev, field) \ 216({ \ 217 struct inet6_dev *_idev = (idev); \ 218 if (likely(_idev != NULL)) \ 219 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \ 220 mod##SNMP_INC_STATS((net)->mib.statname##_statistics, (field));\ 221}) 222 223/* per device and per net counters are atomic_long_t */ 224#define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \ 225({ \ 226 struct inet6_dev *_idev = (idev); \ 227 if (likely(_idev != NULL)) \ 228 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \ 229 SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\ 230}) 231 232#define _DEVADD(net, statname, mod, idev, field, val) \ 233({ \ 234 struct inet6_dev *_idev = (idev); \ 235 if (likely(_idev != NULL)) \ 236 mod##SNMP_ADD_STATS((_idev)->stats.statname, (field), (val)); \ 237 mod##SNMP_ADD_STATS((net)->mib.statname##_statistics, (field), (val));\ 238}) 239 240#define _DEVUPD(net, statname, mod, idev, field, val) \ 241({ \ 242 struct inet6_dev *_idev = (idev); \ 243 if (likely(_idev != NULL)) \ 244 mod##SNMP_UPD_PO_STATS((_idev)->stats.statname, field, (val)); \ 245 mod##SNMP_UPD_PO_STATS((net)->mib.statname##_statistics, field, (val));\ 246}) 247 248/* MIBs */ 249 250#define IP6_INC_STATS(net, idev,field) \ 251 _DEVINC(net, ipv6, , idev, field) 252#define __IP6_INC_STATS(net, idev,field) \ 253 _DEVINC(net, ipv6, __, idev, field) 254#define IP6_ADD_STATS(net, idev,field,val) \ 255 _DEVADD(net, ipv6, , idev, field, val) 256#define __IP6_ADD_STATS(net, idev,field,val) \ 257 _DEVADD(net, ipv6, __, idev, field, val) 258#define IP6_UPD_PO_STATS(net, idev,field,val) \ 259 _DEVUPD(net, ipv6, , idev, field, val) 260#define __IP6_UPD_PO_STATS(net, idev,field,val) \ 261 _DEVUPD(net, ipv6, __, idev, field, val) 262#define ICMP6_INC_STATS(net, idev, field) \ 263 _DEVINCATOMIC(net, icmpv6, , idev, field) 264#define __ICMP6_INC_STATS(net, idev, field) \ 265 _DEVINCATOMIC(net, icmpv6, __, idev, field) 266 267#define ICMP6MSGOUT_INC_STATS(net, idev, field) \ 268 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256) 269#define ICMP6MSGIN_INC_STATS(net, idev, field) \ 270 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field) 271 272struct ip6_ra_chain { 273 struct ip6_ra_chain *next; 274 struct sock *sk; 275 int sel; 276 void (*destructor)(struct sock *); 277}; 278 279extern struct ip6_ra_chain *ip6_ra_chain; 280extern rwlock_t ip6_ra_lock; 281 282/* 283 This structure is prepared by protocol, when parsing 284 ancillary data and passed to IPv6. 285 */ 286 287struct ipv6_txoptions { 288 refcount_t refcnt; 289 /* Length of this structure */ 290 int tot_len; 291 292 /* length of extension headers */ 293 294 __u16 opt_flen; /* after fragment hdr */ 295 __u16 opt_nflen; /* before fragment hdr */ 296 297 struct ipv6_opt_hdr *hopopt; 298 struct ipv6_opt_hdr *dst0opt; 299 struct ipv6_rt_hdr *srcrt; /* Routing Header */ 300 struct ipv6_opt_hdr *dst1opt; 301 struct rcu_head rcu; 302 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */ 303}; 304 305/* flowlabel_reflect sysctl values */ 306enum flowlabel_reflect { 307 FLOWLABEL_REFLECT_ESTABLISHED = 1, 308 FLOWLABEL_REFLECT_TCP_RESET = 2, 309 FLOWLABEL_REFLECT_ICMPV6_ECHO_REPLIES = 4, 310}; 311 312struct ip6_flowlabel { 313 struct ip6_flowlabel __rcu *next; 314 __be32 label; 315 atomic_t users; 316 struct in6_addr dst; 317 struct ipv6_txoptions *opt; 318 unsigned long linger; 319 struct rcu_head rcu; 320 u8 share; 321 union { 322 struct pid *pid; 323 kuid_t uid; 324 } owner; 325 unsigned long lastuse; 326 unsigned long expires; 327 struct net *fl_net; 328}; 329 330#define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF) 331#define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF) 332#define IPV6_FLOWLABEL_STATELESS_FLAG cpu_to_be32(0x00080000) 333 334#define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK) 335#define IPV6_TCLASS_SHIFT 20 336 337struct ipv6_fl_socklist { 338 struct ipv6_fl_socklist __rcu *next; 339 struct ip6_flowlabel *fl; 340 struct rcu_head rcu; 341}; 342 343struct ipcm6_cookie { 344 struct sockcm_cookie sockc; 345 __s16 hlimit; 346 __s16 tclass; 347 __s8 dontfrag; 348 struct ipv6_txoptions *opt; 349 __u16 gso_size; 350}; 351 352static inline void ipcm6_init(struct ipcm6_cookie *ipc6) 353{ 354 *ipc6 = (struct ipcm6_cookie) { 355 .hlimit = -1, 356 .tclass = -1, 357 .dontfrag = -1, 358 }; 359} 360 361static inline void ipcm6_init_sk(struct ipcm6_cookie *ipc6, 362 const struct ipv6_pinfo *np) 363{ 364 *ipc6 = (struct ipcm6_cookie) { 365 .hlimit = -1, 366 .tclass = np->tclass, 367 .dontfrag = np->dontfrag, 368 }; 369} 370 371static inline struct ipv6_txoptions *txopt_get(const struct ipv6_pinfo *np) 372{ 373 struct ipv6_txoptions *opt; 374 375 rcu_read_lock(); 376 opt = rcu_dereference(np->opt); 377 if (opt) { 378 if (!refcount_inc_not_zero(&opt->refcnt)) 379 opt = NULL; 380 else 381 opt = rcu_pointer_handoff(opt); 382 } 383 rcu_read_unlock(); 384 return opt; 385} 386 387static inline void txopt_put(struct ipv6_txoptions *opt) 388{ 389 if (opt && refcount_dec_and_test(&opt->refcnt)) 390 kfree_rcu(opt, rcu); 391} 392 393#if IS_ENABLED(CONFIG_IPV6) 394struct ip6_flowlabel *__fl6_sock_lookup(struct sock *sk, __be32 label); 395 396extern struct static_key_false_deferred ipv6_flowlabel_exclusive; 397static inline struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, 398 __be32 label) 399{ 400 if (static_branch_unlikely(&ipv6_flowlabel_exclusive.key) && 401 READ_ONCE(sock_net(sk)->ipv6.flowlabel_has_excl)) 402 return __fl6_sock_lookup(sk, label) ? : ERR_PTR(-ENOENT); 403 404 return NULL; 405} 406#endif 407 408struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space, 409 struct ip6_flowlabel *fl, 410 struct ipv6_txoptions *fopt); 411void fl6_free_socklist(struct sock *sk); 412int ipv6_flowlabel_opt(struct sock *sk, sockptr_t optval, int optlen); 413int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq, 414 int flags); 415int ip6_flowlabel_init(void); 416void ip6_flowlabel_cleanup(void); 417bool ip6_autoflowlabel(struct net *net, const struct ipv6_pinfo *np); 418 419static inline void fl6_sock_release(struct ip6_flowlabel *fl) 420{ 421 if (fl) 422 atomic_dec(&fl->users); 423} 424 425void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info); 426 427void icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, 428 struct icmp6hdr *thdr, int len); 429 430int ip6_ra_control(struct sock *sk, int sel); 431 432int ipv6_parse_hopopts(struct sk_buff *skb); 433 434struct ipv6_txoptions *ipv6_dup_options(struct sock *sk, 435 struct ipv6_txoptions *opt); 436struct ipv6_txoptions *ipv6_renew_options(struct sock *sk, 437 struct ipv6_txoptions *opt, 438 int newtype, 439 struct ipv6_opt_hdr *newopt); 440struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space, 441 struct ipv6_txoptions *opt); 442 443bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb, 444 const struct inet6_skb_parm *opt); 445struct ipv6_txoptions *ipv6_update_options(struct sock *sk, 446 struct ipv6_txoptions *opt); 447 448static inline bool ipv6_accept_ra(struct inet6_dev *idev) 449{ 450 /* If forwarding is enabled, RA are not accepted unless the special 451 * hybrid mode (accept_ra=2) is enabled. 452 */ 453 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 : 454 idev->cnf.accept_ra; 455} 456 457#define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */ 458#define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */ 459#define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */ 460 461int __ipv6_addr_type(const struct in6_addr *addr); 462static inline int ipv6_addr_type(const struct in6_addr *addr) 463{ 464 return __ipv6_addr_type(addr) & 0xffff; 465} 466 467static inline int ipv6_addr_scope(const struct in6_addr *addr) 468{ 469 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK; 470} 471 472static inline int __ipv6_addr_src_scope(int type) 473{ 474 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16); 475} 476 477static inline int ipv6_addr_src_scope(const struct in6_addr *addr) 478{ 479 return __ipv6_addr_src_scope(__ipv6_addr_type(addr)); 480} 481 482static inline bool __ipv6_addr_needs_scope_id(int type) 483{ 484 return type & IPV6_ADDR_LINKLOCAL || 485 (type & IPV6_ADDR_MULTICAST && 486 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL))); 487} 488 489static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface) 490{ 491 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0; 492} 493 494static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2) 495{ 496 return memcmp(a1, a2, sizeof(struct in6_addr)); 497} 498 499static inline bool 500ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m, 501 const struct in6_addr *a2) 502{ 503#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 504 const unsigned long *ul1 = (const unsigned long *)a1; 505 const unsigned long *ulm = (const unsigned long *)m; 506 const unsigned long *ul2 = (const unsigned long *)a2; 507 508 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) | 509 ((ul1[1] ^ ul2[1]) & ulm[1])); 510#else 511 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) | 512 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) | 513 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) | 514 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3])); 515#endif 516} 517 518static inline void ipv6_addr_prefix(struct in6_addr *pfx, 519 const struct in6_addr *addr, 520 int plen) 521{ 522 /* caller must guarantee 0 <= plen <= 128 */ 523 int o = plen >> 3, 524 b = plen & 0x7; 525 526 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr)); 527 memcpy(pfx->s6_addr, addr, o); 528 if (b != 0) 529 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b); 530} 531 532static inline void ipv6_addr_prefix_copy(struct in6_addr *addr, 533 const struct in6_addr *pfx, 534 int plen) 535{ 536 /* caller must guarantee 0 <= plen <= 128 */ 537 int o = plen >> 3, 538 b = plen & 0x7; 539 540 memcpy(addr->s6_addr, pfx, o); 541 if (b != 0) { 542 addr->s6_addr[o] &= ~(0xff00 >> b); 543 addr->s6_addr[o] |= (pfx->s6_addr[o] & (0xff00 >> b)); 544 } 545} 546 547static inline void __ipv6_addr_set_half(__be32 *addr, 548 __be32 wh, __be32 wl) 549{ 550#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 551#if defined(__BIG_ENDIAN) 552 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) { 553 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl)); 554 return; 555 } 556#elif defined(__LITTLE_ENDIAN) 557 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) { 558 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh)); 559 return; 560 } 561#endif 562#endif 563 addr[0] = wh; 564 addr[1] = wl; 565} 566 567static inline void ipv6_addr_set(struct in6_addr *addr, 568 __be32 w1, __be32 w2, 569 __be32 w3, __be32 w4) 570{ 571 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2); 572 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4); 573} 574 575static inline bool ipv6_addr_equal(const struct in6_addr *a1, 576 const struct in6_addr *a2) 577{ 578#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 579 const unsigned long *ul1 = (const unsigned long *)a1; 580 const unsigned long *ul2 = (const unsigned long *)a2; 581 582 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL; 583#else 584 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) | 585 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) | 586 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) | 587 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0; 588#endif 589} 590 591#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 592static inline bool __ipv6_prefix_equal64_half(const __be64 *a1, 593 const __be64 *a2, 594 unsigned int len) 595{ 596 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len)))) 597 return false; 598 return true; 599} 600 601static inline bool ipv6_prefix_equal(const struct in6_addr *addr1, 602 const struct in6_addr *addr2, 603 unsigned int prefixlen) 604{ 605 const __be64 *a1 = (const __be64 *)addr1; 606 const __be64 *a2 = (const __be64 *)addr2; 607 608 if (prefixlen >= 64) { 609 if (a1[0] ^ a2[0]) 610 return false; 611 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64); 612 } 613 return __ipv6_prefix_equal64_half(a1, a2, prefixlen); 614} 615#else 616static inline bool ipv6_prefix_equal(const struct in6_addr *addr1, 617 const struct in6_addr *addr2, 618 unsigned int prefixlen) 619{ 620 const __be32 *a1 = addr1->s6_addr32; 621 const __be32 *a2 = addr2->s6_addr32; 622 unsigned int pdw, pbi; 623 624 /* check complete u32 in prefix */ 625 pdw = prefixlen >> 5; 626 if (pdw && memcmp(a1, a2, pdw << 2)) 627 return false; 628 629 /* check incomplete u32 in prefix */ 630 pbi = prefixlen & 0x1f; 631 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi)))) 632 return false; 633 634 return true; 635} 636#endif 637 638static inline bool ipv6_addr_any(const struct in6_addr *a) 639{ 640#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 641 const unsigned long *ul = (const unsigned long *)a; 642 643 return (ul[0] | ul[1]) == 0UL; 644#else 645 return (a->s6_addr32[0] | a->s6_addr32[1] | 646 a->s6_addr32[2] | a->s6_addr32[3]) == 0; 647#endif 648} 649 650static inline u32 ipv6_addr_hash(const struct in6_addr *a) 651{ 652#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 653 const unsigned long *ul = (const unsigned long *)a; 654 unsigned long x = ul[0] ^ ul[1]; 655 656 return (u32)(x ^ (x >> 32)); 657#else 658 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^ 659 a->s6_addr32[2] ^ a->s6_addr32[3]); 660#endif 661} 662 663/* more secured version of ipv6_addr_hash() */ 664static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval) 665{ 666 return jhash2((__force const u32 *)a->s6_addr32, 667 ARRAY_SIZE(a->s6_addr32), initval); 668} 669 670static inline bool ipv6_addr_loopback(const struct in6_addr *a) 671{ 672#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 673 const __be64 *be = (const __be64 *)a; 674 675 return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL; 676#else 677 return (a->s6_addr32[0] | a->s6_addr32[1] | 678 a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0; 679#endif 680} 681 682/* 683 * Note that we must __force cast these to unsigned long to make sparse happy, 684 * since all of the endian-annotated types are fixed size regardless of arch. 685 */ 686static inline bool ipv6_addr_v4mapped(const struct in6_addr *a) 687{ 688 return ( 689#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 690 *(unsigned long *)a | 691#else 692 (__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) | 693#endif 694 (__force unsigned long)(a->s6_addr32[2] ^ 695 cpu_to_be32(0x0000ffff))) == 0UL; 696} 697 698static inline bool ipv6_addr_v4mapped_loopback(const struct in6_addr *a) 699{ 700 return ipv6_addr_v4mapped(a) && ipv4_is_loopback(a->s6_addr32[3]); 701} 702 703static inline u32 ipv6_portaddr_hash(const struct net *net, 704 const struct in6_addr *addr6, 705 unsigned int port) 706{ 707 unsigned int hash, mix = net_hash_mix(net); 708 709 if (ipv6_addr_any(addr6)) 710 hash = jhash_1word(0, mix); 711 else if (ipv6_addr_v4mapped(addr6)) 712 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix); 713 else 714 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix); 715 716 return hash ^ port; 717} 718 719/* 720 * Check for a RFC 4843 ORCHID address 721 * (Overlay Routable Cryptographic Hash Identifiers) 722 */ 723static inline bool ipv6_addr_orchid(const struct in6_addr *a) 724{ 725 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010); 726} 727 728static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr) 729{ 730 return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000); 731} 732 733static inline void ipv6_addr_set_v4mapped(const __be32 addr, 734 struct in6_addr *v4mapped) 735{ 736 ipv6_addr_set(v4mapped, 737 0, 0, 738 htonl(0x0000FFFF), 739 addr); 740} 741 742/* 743 * find the first different bit between two addresses 744 * length of address must be a multiple of 32bits 745 */ 746static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen) 747{ 748 const __be32 *a1 = token1, *a2 = token2; 749 int i; 750 751 addrlen >>= 2; 752 753 for (i = 0; i < addrlen; i++) { 754 __be32 xb = a1[i] ^ a2[i]; 755 if (xb) 756 return i * 32 + 31 - __fls(ntohl(xb)); 757 } 758 759 /* 760 * we should *never* get to this point since that 761 * would mean the addrs are equal 762 * 763 * However, we do get to it 8) And exacly, when 764 * addresses are equal 8) 765 * 766 * ip route add 1111::/128 via ... 767 * ip route add 1111::/64 via ... 768 * and we are here. 769 * 770 * Ideally, this function should stop comparison 771 * at prefix length. It does not, but it is still OK, 772 * if returned value is greater than prefix length. 773 * --ANK (980803) 774 */ 775 return addrlen << 5; 776} 777 778#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 779static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen) 780{ 781 const __be64 *a1 = token1, *a2 = token2; 782 int i; 783 784 addrlen >>= 3; 785 786 for (i = 0; i < addrlen; i++) { 787 __be64 xb = a1[i] ^ a2[i]; 788 if (xb) 789 return i * 64 + 63 - __fls(be64_to_cpu(xb)); 790 } 791 792 return addrlen << 6; 793} 794#endif 795 796static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen) 797{ 798#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 799 if (__builtin_constant_p(addrlen) && !(addrlen & 7)) 800 return __ipv6_addr_diff64(token1, token2, addrlen); 801#endif 802 return __ipv6_addr_diff32(token1, token2, addrlen); 803} 804 805static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2) 806{ 807 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr)); 808} 809 810__be32 ipv6_select_ident(struct net *net, 811 const struct in6_addr *daddr, 812 const struct in6_addr *saddr); 813__be32 ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb); 814 815int ip6_dst_hoplimit(struct dst_entry *dst); 816 817static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6, 818 struct dst_entry *dst) 819{ 820 int hlimit; 821 822 if (ipv6_addr_is_multicast(&fl6->daddr)) 823 hlimit = np->mcast_hops; 824 else 825 hlimit = np->hop_limit; 826 if (hlimit < 0) 827 hlimit = ip6_dst_hoplimit(dst); 828 return hlimit; 829} 830 831/* copy IPv6 saddr & daddr to flow_keys, possibly using 64bit load/store 832 * Equivalent to : flow->v6addrs.src = iph->saddr; 833 * flow->v6addrs.dst = iph->daddr; 834 */ 835static inline void iph_to_flow_copy_v6addrs(struct flow_keys *flow, 836 const struct ipv6hdr *iph) 837{ 838 BUILD_BUG_ON(offsetof(typeof(flow->addrs), v6addrs.dst) != 839 offsetof(typeof(flow->addrs), v6addrs.src) + 840 sizeof(flow->addrs.v6addrs.src)); 841 memcpy(&flow->addrs.v6addrs, &iph->addrs, sizeof(flow->addrs.v6addrs)); 842 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; 843} 844 845#if IS_ENABLED(CONFIG_IPV6) 846 847static inline bool ipv6_can_nonlocal_bind(struct net *net, 848 struct inet_sock *inet) 849{ 850 return net->ipv6.sysctl.ip_nonlocal_bind || 851 inet->freebind || inet->transparent; 852} 853 854/* Sysctl settings for net ipv6.auto_flowlabels */ 855#define IP6_AUTO_FLOW_LABEL_OFF 0 856#define IP6_AUTO_FLOW_LABEL_OPTOUT 1 857#define IP6_AUTO_FLOW_LABEL_OPTIN 2 858#define IP6_AUTO_FLOW_LABEL_FORCED 3 859 860#define IP6_AUTO_FLOW_LABEL_MAX IP6_AUTO_FLOW_LABEL_FORCED 861 862#define IP6_DEFAULT_AUTO_FLOW_LABELS IP6_AUTO_FLOW_LABEL_OPTOUT 863 864static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb, 865 __be32 flowlabel, bool autolabel, 866 struct flowi6 *fl6) 867{ 868 u32 hash; 869 870 /* @flowlabel may include more than a flow label, eg, the traffic class. 871 * Here we want only the flow label value. 872 */ 873 flowlabel &= IPV6_FLOWLABEL_MASK; 874 875 if (flowlabel || 876 net->ipv6.sysctl.auto_flowlabels == IP6_AUTO_FLOW_LABEL_OFF || 877 (!autolabel && 878 net->ipv6.sysctl.auto_flowlabels != IP6_AUTO_FLOW_LABEL_FORCED)) 879 return flowlabel; 880 881 hash = skb_get_hash_flowi6(skb, fl6); 882 883 /* Since this is being sent on the wire obfuscate hash a bit 884 * to minimize possbility that any useful information to an 885 * attacker is leaked. Only lower 20 bits are relevant. 886 */ 887 hash = rol32(hash, 16); 888 889 flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK; 890 891 if (net->ipv6.sysctl.flowlabel_state_ranges) 892 flowlabel |= IPV6_FLOWLABEL_STATELESS_FLAG; 893 894 return flowlabel; 895} 896 897static inline int ip6_default_np_autolabel(struct net *net) 898{ 899 switch (net->ipv6.sysctl.auto_flowlabels) { 900 case IP6_AUTO_FLOW_LABEL_OFF: 901 case IP6_AUTO_FLOW_LABEL_OPTIN: 902 default: 903 return 0; 904 case IP6_AUTO_FLOW_LABEL_OPTOUT: 905 case IP6_AUTO_FLOW_LABEL_FORCED: 906 return 1; 907 } 908} 909#else 910static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb, 911 __be32 flowlabel, bool autolabel, 912 struct flowi6 *fl6) 913{ 914 return flowlabel; 915} 916static inline int ip6_default_np_autolabel(struct net *net) 917{ 918 return 0; 919} 920#endif 921 922#if IS_ENABLED(CONFIG_IPV6) 923static inline int ip6_multipath_hash_policy(const struct net *net) 924{ 925 return net->ipv6.sysctl.multipath_hash_policy; 926} 927#else 928static inline int ip6_multipath_hash_policy(const struct net *net) 929{ 930 return 0; 931} 932#endif 933 934/* 935 * Header manipulation 936 */ 937static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass, 938 __be32 flowlabel) 939{ 940 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel; 941} 942 943static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr) 944{ 945 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK; 946} 947 948static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr) 949{ 950 return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK; 951} 952 953static inline u8 ip6_tclass(__be32 flowinfo) 954{ 955 return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT; 956} 957 958static inline __be32 ip6_make_flowinfo(unsigned int tclass, __be32 flowlabel) 959{ 960 return htonl(tclass << IPV6_TCLASS_SHIFT) | flowlabel; 961} 962 963static inline __be32 flowi6_get_flowlabel(const struct flowi6 *fl6) 964{ 965 return fl6->flowlabel & IPV6_FLOWLABEL_MASK; 966} 967 968/* 969 * Prototypes exported by ipv6 970 */ 971 972/* 973 * rcv function (called from netdevice level) 974 */ 975 976int ipv6_rcv(struct sk_buff *skb, struct net_device *dev, 977 struct packet_type *pt, struct net_device *orig_dev); 978void ipv6_list_rcv(struct list_head *head, struct packet_type *pt, 979 struct net_device *orig_dev); 980 981int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 982 983/* 984 * upper-layer output functions 985 */ 986int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6, 987 __u32 mark, struct ipv6_txoptions *opt, int tclass, u32 priority); 988 989int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr); 990 991int ip6_append_data(struct sock *sk, 992 int getfrag(void *from, char *to, int offset, int len, 993 int odd, struct sk_buff *skb), 994 void *from, int length, int transhdrlen, 995 struct ipcm6_cookie *ipc6, struct flowi6 *fl6, 996 struct rt6_info *rt, unsigned int flags); 997 998int ip6_push_pending_frames(struct sock *sk); 999 1000void ip6_flush_pending_frames(struct sock *sk); 1001 1002int ip6_send_skb(struct sk_buff *skb); 1003 1004struct sk_buff *__ip6_make_skb(struct sock *sk, struct sk_buff_head *queue, 1005 struct inet_cork_full *cork, 1006 struct inet6_cork *v6_cork); 1007struct sk_buff *ip6_make_skb(struct sock *sk, 1008 int getfrag(void *from, char *to, int offset, 1009 int len, int odd, struct sk_buff *skb), 1010 void *from, int length, int transhdrlen, 1011 struct ipcm6_cookie *ipc6, struct flowi6 *fl6, 1012 struct rt6_info *rt, unsigned int flags, 1013 struct inet_cork_full *cork); 1014 1015static inline struct sk_buff *ip6_finish_skb(struct sock *sk) 1016{ 1017 return __ip6_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork, 1018 &inet6_sk(sk)->cork); 1019} 1020 1021int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst, 1022 struct flowi6 *fl6); 1023struct dst_entry *ip6_dst_lookup_flow(struct net *net, const struct sock *sk, struct flowi6 *fl6, 1024 const struct in6_addr *final_dst); 1025struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6, 1026 const struct in6_addr *final_dst, 1027 bool connected); 1028struct dst_entry *ip6_dst_lookup_tunnel(struct sk_buff *skb, 1029 struct net_device *dev, 1030 struct net *net, struct socket *sock, 1031 struct in6_addr *saddr, 1032 const struct ip_tunnel_info *info, 1033 u8 protocol, bool use_cache); 1034struct dst_entry *ip6_blackhole_route(struct net *net, 1035 struct dst_entry *orig_dst); 1036 1037/* 1038 * skb processing functions 1039 */ 1040 1041int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb); 1042int ip6_forward(struct sk_buff *skb); 1043int ip6_input(struct sk_buff *skb); 1044int ip6_mc_input(struct sk_buff *skb); 1045void ip6_protocol_deliver_rcu(struct net *net, struct sk_buff *skb, int nexthdr, 1046 bool have_final); 1047 1048int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); 1049int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); 1050 1051/* 1052 * Extension header (options) processing 1053 */ 1054 1055void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, 1056 u8 *proto, struct in6_addr **daddr_p, 1057 struct in6_addr *saddr); 1058void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, 1059 u8 *proto); 1060 1061int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp, 1062 __be16 *frag_offp); 1063 1064bool ipv6_ext_hdr(u8 nexthdr); 1065 1066enum { 1067 IP6_FH_F_FRAG = (1 << 0), 1068 IP6_FH_F_AUTH = (1 << 1), 1069 IP6_FH_F_SKIP_RH = (1 << 2), 1070}; 1071 1072/* find specified header and get offset to it */ 1073int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target, 1074 unsigned short *fragoff, int *fragflg); 1075 1076int ipv6_find_tlv(const struct sk_buff *skb, int offset, int type); 1077 1078struct in6_addr *fl6_update_dst(struct flowi6 *fl6, 1079 const struct ipv6_txoptions *opt, 1080 struct in6_addr *orig); 1081 1082/* 1083 * socket options (ipv6_sockglue.c) 1084 */ 1085 1086int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, 1087 unsigned int optlen); 1088int ipv6_getsockopt(struct sock *sk, int level, int optname, 1089 char __user *optval, int __user *optlen); 1090 1091int __ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, 1092 int addr_len); 1093int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len); 1094int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr, 1095 int addr_len); 1096int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr); 1097void ip6_datagram_release_cb(struct sock *sk); 1098 1099int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, 1100 int *addr_len); 1101int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len, 1102 int *addr_len); 1103void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, 1104 u32 info, u8 *payload); 1105void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info); 1106void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu); 1107 1108void inet6_cleanup_sock(struct sock *sk); 1109void inet6_sock_destruct(struct sock *sk); 1110int inet6_release(struct socket *sock); 1111int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len); 1112int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 1113 int peer); 1114int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg); 1115int inet6_compat_ioctl(struct socket *sock, unsigned int cmd, 1116 unsigned long arg); 1117 1118int inet6_hash_connect(struct inet_timewait_death_row *death_row, 1119 struct sock *sk); 1120int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size); 1121int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 1122 int flags); 1123 1124/* 1125 * reassembly.c 1126 */ 1127extern const struct proto_ops inet6_stream_ops; 1128extern const struct proto_ops inet6_dgram_ops; 1129extern const struct proto_ops inet6_sockraw_ops; 1130 1131struct group_source_req; 1132struct group_filter; 1133 1134int ip6_mc_source(int add, int omode, struct sock *sk, 1135 struct group_source_req *pgsr); 1136int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf, 1137 struct sockaddr_storage *list); 1138int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 1139 struct sockaddr_storage __user *p); 1140 1141#ifdef CONFIG_PROC_FS 1142int ac6_proc_init(struct net *net); 1143void ac6_proc_exit(struct net *net); 1144int raw6_proc_init(void); 1145void raw6_proc_exit(void); 1146int tcp6_proc_init(struct net *net); 1147void tcp6_proc_exit(struct net *net); 1148int udp6_proc_init(struct net *net); 1149void udp6_proc_exit(struct net *net); 1150int udplite6_proc_init(void); 1151void udplite6_proc_exit(void); 1152int ipv6_misc_proc_init(void); 1153void ipv6_misc_proc_exit(void); 1154int snmp6_register_dev(struct inet6_dev *idev); 1155int snmp6_unregister_dev(struct inet6_dev *idev); 1156 1157#else 1158static inline int ac6_proc_init(struct net *net) { return 0; } 1159static inline void ac6_proc_exit(struct net *net) { } 1160static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; } 1161static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; } 1162#endif 1163 1164#ifdef CONFIG_SYSCTL 1165struct ctl_table *ipv6_icmp_sysctl_init(struct net *net); 1166struct ctl_table *ipv6_route_sysctl_init(struct net *net); 1167int ipv6_sysctl_register(void); 1168void ipv6_sysctl_unregister(void); 1169#endif 1170 1171int ipv6_sock_mc_join(struct sock *sk, int ifindex, 1172 const struct in6_addr *addr); 1173int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex, 1174 const struct in6_addr *addr, unsigned int mode); 1175int ipv6_sock_mc_drop(struct sock *sk, int ifindex, 1176 const struct in6_addr *addr); 1177 1178static inline int ip6_sock_set_v6only(struct sock *sk) 1179{ 1180 if (inet_sk(sk)->inet_num) 1181 return -EINVAL; 1182 lock_sock(sk); 1183 sk->sk_ipv6only = true; 1184 release_sock(sk); 1185 return 0; 1186} 1187 1188static inline void ip6_sock_set_recverr(struct sock *sk) 1189{ 1190 lock_sock(sk); 1191 inet6_sk(sk)->recverr = true; 1192 release_sock(sk); 1193} 1194 1195static inline int __ip6_sock_set_addr_preferences(struct sock *sk, int val) 1196{ 1197 unsigned int pref = 0; 1198 unsigned int prefmask = ~0; 1199 1200 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */ 1201 switch (val & (IPV6_PREFER_SRC_PUBLIC | 1202 IPV6_PREFER_SRC_TMP | 1203 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) { 1204 case IPV6_PREFER_SRC_PUBLIC: 1205 pref |= IPV6_PREFER_SRC_PUBLIC; 1206 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC | 1207 IPV6_PREFER_SRC_TMP); 1208 break; 1209 case IPV6_PREFER_SRC_TMP: 1210 pref |= IPV6_PREFER_SRC_TMP; 1211 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC | 1212 IPV6_PREFER_SRC_TMP); 1213 break; 1214 case IPV6_PREFER_SRC_PUBTMP_DEFAULT: 1215 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC | 1216 IPV6_PREFER_SRC_TMP); 1217 break; 1218 case 0: 1219 break; 1220 default: 1221 return -EINVAL; 1222 } 1223 1224 /* check HOME/COA conflicts */ 1225 switch (val & (IPV6_PREFER_SRC_HOME | IPV6_PREFER_SRC_COA)) { 1226 case IPV6_PREFER_SRC_HOME: 1227 prefmask &= ~IPV6_PREFER_SRC_COA; 1228 break; 1229 case IPV6_PREFER_SRC_COA: 1230 pref |= IPV6_PREFER_SRC_COA; 1231 break; 1232 case 0: 1233 break; 1234 default: 1235 return -EINVAL; 1236 } 1237 1238 /* check CGA/NONCGA conflicts */ 1239 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) { 1240 case IPV6_PREFER_SRC_CGA: 1241 case IPV6_PREFER_SRC_NONCGA: 1242 case 0: 1243 break; 1244 default: 1245 return -EINVAL; 1246 } 1247 1248 inet6_sk(sk)->srcprefs = (inet6_sk(sk)->srcprefs & prefmask) | pref; 1249 return 0; 1250} 1251 1252static inline int ip6_sock_set_addr_preferences(struct sock *sk, int val) 1253{ 1254 int ret; 1255 1256 lock_sock(sk); 1257 ret = __ip6_sock_set_addr_preferences(sk, val); 1258 release_sock(sk); 1259 return ret; 1260} 1261 1262static inline void ip6_sock_set_recvpktinfo(struct sock *sk) 1263{ 1264 lock_sock(sk); 1265 inet6_sk(sk)->rxopt.bits.rxinfo = true; 1266 release_sock(sk); 1267} 1268 1269#endif /* _NET_IPV6_H */ 1270