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_IPV4 4 /* IPv4 in IPv6 */ 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 /* Limits on Hop-by-Hop and Destination options. 54 * 55 * Per RFC8200 there is no limit on the maximum number or lengths of options in 56 * Hop-by-Hop or Destination options other then the packet must fit in an MTU. 57 * We allow configurable limits in order to mitigate potential denial of 58 * service attacks. 59 * 60 * There are three limits that may be set: 61 * - Limit the number of options in a Hop-by-Hop or Destination options 62 * extension header 63 * - Limit the byte length of a Hop-by-Hop or Destination options extension 64 * header 65 * - Disallow unknown options 66 * 67 * The limits are expressed in corresponding sysctls: 68 * 69 * ipv6.sysctl.max_dst_opts_cnt 70 * ipv6.sysctl.max_hbh_opts_cnt 71 * ipv6.sysctl.max_dst_opts_len 72 * ipv6.sysctl.max_hbh_opts_len 73 * 74 * max_*_opts_cnt is the number of TLVs that are allowed for Destination 75 * options or Hop-by-Hop options. If the number is less than zero then unknown 76 * TLVs are disallowed and the number of known options that are allowed is the 77 * absolute value. Setting the value to INT_MAX indicates no limit. 78 * 79 * max_*_opts_len is the length limit in bytes of a Destination or 80 * Hop-by-Hop options extension header. Setting the value to INT_MAX 81 * indicates no length limit. 82 * 83 * If a limit is exceeded when processing an extension header the packet is 84 * silently discarded. 85 */ 86 87 /* Default limits for Hop-by-Hop and Destination options */ 88 #define IP6_DEFAULT_MAX_DST_OPTS_CNT 8 89 #define IP6_DEFAULT_MAX_HBH_OPTS_CNT 8 90 #define IP6_DEFAULT_MAX_DST_OPTS_LEN INT_MAX /* No limit */ 91 #define IP6_DEFAULT_MAX_HBH_OPTS_LEN INT_MAX /* No limit */ 92 93 /* 94 * Addr type 95 * 96 * type - unicast | multicast 97 * scope - local | site | global 98 * v4 - compat 99 * v4mapped 100 * any 101 * loopback 102 */ 103 104 #define IPV6_ADDR_ANY 0x0000U 105 106 #define IPV6_ADDR_UNICAST 0x0001U 107 #define IPV6_ADDR_MULTICAST 0x0002U 108 109 #define IPV6_ADDR_LOOPBACK 0x0010U 110 #define IPV6_ADDR_LINKLOCAL 0x0020U 111 #define IPV6_ADDR_SITELOCAL 0x0040U 112 113 #define IPV6_ADDR_COMPATv4 0x0080U 114 115 #define IPV6_ADDR_SCOPE_MASK 0x00f0U 116 117 #define IPV6_ADDR_MAPPED 0x1000U 118 119 /* 120 * Addr scopes 121 */ 122 #define IPV6_ADDR_MC_SCOPE(a) \ 123 ((a)->s6_addr[1] & 0x0f) /* nonstandard */ 124 #define __IPV6_ADDR_SCOPE_INVALID -1 125 #define IPV6_ADDR_SCOPE_NODELOCAL 0x01 126 #define IPV6_ADDR_SCOPE_LINKLOCAL 0x02 127 #define IPV6_ADDR_SCOPE_SITELOCAL 0x05 128 #define IPV6_ADDR_SCOPE_ORGLOCAL 0x08 129 #define IPV6_ADDR_SCOPE_GLOBAL 0x0e 130 131 /* 132 * Addr flags 133 */ 134 #define IPV6_ADDR_MC_FLAG_TRANSIENT(a) \ 135 ((a)->s6_addr[1] & 0x10) 136 #define IPV6_ADDR_MC_FLAG_PREFIX(a) \ 137 ((a)->s6_addr[1] & 0x20) 138 #define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \ 139 ((a)->s6_addr[1] & 0x40) 140 141 /* 142 * fragmentation header 143 */ 144 145 struct frag_hdr { 146 __u8 nexthdr; 147 __u8 reserved; 148 __be16 frag_off; 149 __be32 identification; 150 }; 151 152 #define IP6_MF 0x0001 153 #define IP6_OFFSET 0xFFF8 154 155 struct ip6_fraglist_iter { 156 struct ipv6hdr *tmp_hdr; 157 struct sk_buff *frag; 158 int offset; 159 unsigned int hlen; 160 __be32 frag_id; 161 u8 nexthdr; 162 }; 163 164 int ip6_fraglist_init(struct sk_buff *skb, unsigned int hlen, u8 *prevhdr, 165 u8 nexthdr, __be32 frag_id, 166 struct ip6_fraglist_iter *iter); 167 void ip6_fraglist_prepare(struct sk_buff *skb, struct ip6_fraglist_iter *iter); 168 169 static inline struct sk_buff *ip6_fraglist_next(struct ip6_fraglist_iter *iter) 170 { 171 struct sk_buff *skb = iter->frag; 172 173 iter->frag = skb->next; 174 skb_mark_not_on_list(skb); 175 176 return skb; 177 } 178 179 struct ip6_frag_state { 180 u8 *prevhdr; 181 unsigned int hlen; 182 unsigned int mtu; 183 unsigned int left; 184 int offset; 185 int ptr; 186 int hroom; 187 int troom; 188 __be32 frag_id; 189 u8 nexthdr; 190 }; 191 192 void ip6_frag_init(struct sk_buff *skb, unsigned int hlen, unsigned int mtu, 193 unsigned short needed_tailroom, int hdr_room, u8 *prevhdr, 194 u8 nexthdr, __be32 frag_id, struct ip6_frag_state *state); 195 struct sk_buff *ip6_frag_next(struct sk_buff *skb, 196 struct ip6_frag_state *state); 197 198 #define IP6_REPLY_MARK(net, mark) \ 199 ((net)->ipv6.sysctl.fwmark_reflect ? (mark) : 0) 200 201 #include <net/sock.h> 202 203 /* sysctls */ 204 extern int sysctl_mld_max_msf; 205 extern int sysctl_mld_qrv; 206 207 #define _DEVINC(net, statname, mod, idev, field) \ 208 ({ \ 209 struct inet6_dev *_idev = (idev); \ 210 if (likely(_idev != NULL)) \ 211 mod##SNMP_INC_STATS64((_idev)->stats.statname, (field));\ 212 mod##SNMP_INC_STATS64((net)->mib.statname##_statistics, (field));\ 213 }) 214 215 /* per device counters are atomic_long_t */ 216 #define _DEVINCATOMIC(net, statname, mod, idev, field) \ 217 ({ \ 218 struct inet6_dev *_idev = (idev); \ 219 if (likely(_idev != NULL)) \ 220 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \ 221 mod##SNMP_INC_STATS((net)->mib.statname##_statistics, (field));\ 222 }) 223 224 /* per device and per net counters are atomic_long_t */ 225 #define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \ 226 ({ \ 227 struct inet6_dev *_idev = (idev); \ 228 if (likely(_idev != NULL)) \ 229 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \ 230 SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\ 231 }) 232 233 #define _DEVADD(net, statname, mod, idev, field, val) \ 234 ({ \ 235 struct inet6_dev *_idev = (idev); \ 236 if (likely(_idev != NULL)) \ 237 mod##SNMP_ADD_STATS((_idev)->stats.statname, (field), (val)); \ 238 mod##SNMP_ADD_STATS((net)->mib.statname##_statistics, (field), (val));\ 239 }) 240 241 #define _DEVUPD(net, statname, mod, idev, field, val) \ 242 ({ \ 243 struct inet6_dev *_idev = (idev); \ 244 if (likely(_idev != NULL)) \ 245 mod##SNMP_UPD_PO_STATS((_idev)->stats.statname, field, (val)); \ 246 mod##SNMP_UPD_PO_STATS((net)->mib.statname##_statistics, field, (val));\ 247 }) 248 249 /* MIBs */ 250 251 #define IP6_INC_STATS(net, idev,field) \ 252 _DEVINC(net, ipv6, , idev, field) 253 #define __IP6_INC_STATS(net, idev,field) \ 254 _DEVINC(net, ipv6, __, idev, field) 255 #define IP6_ADD_STATS(net, idev,field,val) \ 256 _DEVADD(net, ipv6, , idev, field, val) 257 #define __IP6_ADD_STATS(net, idev,field,val) \ 258 _DEVADD(net, ipv6, __, idev, field, val) 259 #define IP6_UPD_PO_STATS(net, idev,field,val) \ 260 _DEVUPD(net, ipv6, , idev, field, val) 261 #define __IP6_UPD_PO_STATS(net, idev,field,val) \ 262 _DEVUPD(net, ipv6, __, idev, field, val) 263 #define ICMP6_INC_STATS(net, idev, field) \ 264 _DEVINCATOMIC(net, icmpv6, , idev, field) 265 #define __ICMP6_INC_STATS(net, idev, field) \ 266 _DEVINCATOMIC(net, icmpv6, __, idev, field) 267 268 #define ICMP6MSGOUT_INC_STATS(net, idev, field) \ 269 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256) 270 #define ICMP6MSGIN_INC_STATS(net, idev, field) \ 271 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field) 272 273 struct ip6_ra_chain { 274 struct ip6_ra_chain *next; 275 struct sock *sk; 276 int sel; 277 void (*destructor)(struct sock *); 278 }; 279 280 extern struct ip6_ra_chain *ip6_ra_chain; 281 extern rwlock_t ip6_ra_lock; 282 283 /* 284 This structure is prepared by protocol, when parsing 285 ancillary data and passed to IPv6. 286 */ 287 288 struct ipv6_txoptions { 289 refcount_t refcnt; 290 /* Length of this structure */ 291 int tot_len; 292 293 /* length of extension headers */ 294 295 __u16 opt_flen; /* after fragment hdr */ 296 __u16 opt_nflen; /* before fragment hdr */ 297 298 struct ipv6_opt_hdr *hopopt; 299 struct ipv6_opt_hdr *dst0opt; 300 struct ipv6_rt_hdr *srcrt; /* Routing Header */ 301 struct ipv6_opt_hdr *dst1opt; 302 struct rcu_head rcu; 303 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */ 304 }; 305 306 /* flowlabel_reflect sysctl values */ 307 enum flowlabel_reflect { 308 FLOWLABEL_REFLECT_ESTABLISHED = 1, 309 FLOWLABEL_REFLECT_TCP_RESET = 2, 310 FLOWLABEL_REFLECT_ICMPV6_ECHO_REPLIES = 4, 311 }; 312 313 struct ip6_flowlabel { 314 struct ip6_flowlabel __rcu *next; 315 __be32 label; 316 atomic_t users; 317 struct in6_addr dst; 318 struct ipv6_txoptions *opt; 319 unsigned long linger; 320 struct rcu_head rcu; 321 u8 share; 322 union { 323 struct pid *pid; 324 kuid_t uid; 325 } owner; 326 unsigned long lastuse; 327 unsigned long expires; 328 struct net *fl_net; 329 }; 330 331 #define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF) 332 #define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF) 333 #define IPV6_FLOWLABEL_STATELESS_FLAG cpu_to_be32(0x00080000) 334 335 #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK) 336 #define IPV6_TCLASS_SHIFT 20 337 338 struct ipv6_fl_socklist { 339 struct ipv6_fl_socklist __rcu *next; 340 struct ip6_flowlabel *fl; 341 struct rcu_head rcu; 342 }; 343 344 struct ipcm6_cookie { 345 struct sockcm_cookie sockc; 346 __s16 hlimit; 347 __s16 tclass; 348 __s8 dontfrag; 349 struct ipv6_txoptions *opt; 350 __u16 gso_size; 351 }; 352 353 static inline void ipcm6_init(struct ipcm6_cookie *ipc6) 354 { 355 *ipc6 = (struct ipcm6_cookie) { 356 .hlimit = -1, 357 .tclass = -1, 358 .dontfrag = -1, 359 }; 360 } 361 362 static inline void ipcm6_init_sk(struct ipcm6_cookie *ipc6, 363 const struct ipv6_pinfo *np) 364 { 365 *ipc6 = (struct ipcm6_cookie) { 366 .hlimit = -1, 367 .tclass = np->tclass, 368 .dontfrag = np->dontfrag, 369 }; 370 } 371 372 static inline struct ipv6_txoptions *txopt_get(const struct ipv6_pinfo *np) 373 { 374 struct ipv6_txoptions *opt; 375 376 rcu_read_lock(); 377 opt = rcu_dereference(np->opt); 378 if (opt) { 379 if (!refcount_inc_not_zero(&opt->refcnt)) 380 opt = NULL; 381 else 382 opt = rcu_pointer_handoff(opt); 383 } 384 rcu_read_unlock(); 385 return opt; 386 } 387 388 static inline void txopt_put(struct ipv6_txoptions *opt) 389 { 390 if (opt && refcount_dec_and_test(&opt->refcnt)) 391 kfree_rcu(opt, rcu); 392 } 393 394 struct ip6_flowlabel *__fl6_sock_lookup(struct sock *sk, __be32 label); 395 396 extern struct static_key_false_deferred ipv6_flowlabel_exclusive; 397 static inline struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, 398 __be32 label) 399 { 400 if (static_branch_unlikely(&ipv6_flowlabel_exclusive.key)) 401 return __fl6_sock_lookup(sk, label) ? : ERR_PTR(-ENOENT); 402 403 return NULL; 404 } 405 406 struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space, 407 struct ip6_flowlabel *fl, 408 struct ipv6_txoptions *fopt); 409 void fl6_free_socklist(struct sock *sk); 410 int ipv6_flowlabel_opt(struct sock *sk, sockptr_t optval, int optlen); 411 int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq, 412 int flags); 413 int ip6_flowlabel_init(void); 414 void ip6_flowlabel_cleanup(void); 415 bool ip6_autoflowlabel(struct net *net, const struct ipv6_pinfo *np); 416 417 static inline void fl6_sock_release(struct ip6_flowlabel *fl) 418 { 419 if (fl) 420 atomic_dec(&fl->users); 421 } 422 423 void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info); 424 425 void icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, 426 struct icmp6hdr *thdr, int len); 427 428 int ip6_ra_control(struct sock *sk, int sel); 429 430 int ipv6_parse_hopopts(struct sk_buff *skb); 431 432 struct ipv6_txoptions *ipv6_dup_options(struct sock *sk, 433 struct ipv6_txoptions *opt); 434 struct ipv6_txoptions *ipv6_renew_options(struct sock *sk, 435 struct ipv6_txoptions *opt, 436 int newtype, 437 struct ipv6_opt_hdr *newopt); 438 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space, 439 struct ipv6_txoptions *opt); 440 441 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb, 442 const struct inet6_skb_parm *opt); 443 struct ipv6_txoptions *ipv6_update_options(struct sock *sk, 444 struct ipv6_txoptions *opt); 445 446 static inline bool ipv6_accept_ra(struct inet6_dev *idev) 447 { 448 /* If forwarding is enabled, RA are not accepted unless the special 449 * hybrid mode (accept_ra=2) is enabled. 450 */ 451 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 : 452 idev->cnf.accept_ra; 453 } 454 455 #define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */ 456 #define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */ 457 #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */ 458 459 int __ipv6_addr_type(const struct in6_addr *addr); 460 static inline int ipv6_addr_type(const struct in6_addr *addr) 461 { 462 return __ipv6_addr_type(addr) & 0xffff; 463 } 464 465 static inline int ipv6_addr_scope(const struct in6_addr *addr) 466 { 467 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK; 468 } 469 470 static inline int __ipv6_addr_src_scope(int type) 471 { 472 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16); 473 } 474 475 static inline int ipv6_addr_src_scope(const struct in6_addr *addr) 476 { 477 return __ipv6_addr_src_scope(__ipv6_addr_type(addr)); 478 } 479 480 static inline bool __ipv6_addr_needs_scope_id(int type) 481 { 482 return type & IPV6_ADDR_LINKLOCAL || 483 (type & IPV6_ADDR_MULTICAST && 484 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL))); 485 } 486 487 static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface) 488 { 489 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0; 490 } 491 492 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2) 493 { 494 return memcmp(a1, a2, sizeof(struct in6_addr)); 495 } 496 497 static inline bool 498 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m, 499 const struct in6_addr *a2) 500 { 501 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 502 const unsigned long *ul1 = (const unsigned long *)a1; 503 const unsigned long *ulm = (const unsigned long *)m; 504 const unsigned long *ul2 = (const unsigned long *)a2; 505 506 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) | 507 ((ul1[1] ^ ul2[1]) & ulm[1])); 508 #else 509 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) | 510 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) | 511 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) | 512 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3])); 513 #endif 514 } 515 516 static inline void ipv6_addr_prefix(struct in6_addr *pfx, 517 const struct in6_addr *addr, 518 int plen) 519 { 520 /* caller must guarantee 0 <= plen <= 128 */ 521 int o = plen >> 3, 522 b = plen & 0x7; 523 524 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr)); 525 memcpy(pfx->s6_addr, addr, o); 526 if (b != 0) 527 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b); 528 } 529 530 static inline void ipv6_addr_prefix_copy(struct in6_addr *addr, 531 const struct in6_addr *pfx, 532 int plen) 533 { 534 /* caller must guarantee 0 <= plen <= 128 */ 535 int o = plen >> 3, 536 b = plen & 0x7; 537 538 memcpy(addr->s6_addr, pfx, o); 539 if (b != 0) { 540 addr->s6_addr[o] &= ~(0xff00 >> b); 541 addr->s6_addr[o] |= (pfx->s6_addr[o] & (0xff00 >> b)); 542 } 543 } 544 545 static inline void __ipv6_addr_set_half(__be32 *addr, 546 __be32 wh, __be32 wl) 547 { 548 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 549 #if defined(__BIG_ENDIAN) 550 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) { 551 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl)); 552 return; 553 } 554 #elif defined(__LITTLE_ENDIAN) 555 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) { 556 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh)); 557 return; 558 } 559 #endif 560 #endif 561 addr[0] = wh; 562 addr[1] = wl; 563 } 564 565 static inline void ipv6_addr_set(struct in6_addr *addr, 566 __be32 w1, __be32 w2, 567 __be32 w3, __be32 w4) 568 { 569 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2); 570 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4); 571 } 572 573 static inline bool ipv6_addr_equal(const struct in6_addr *a1, 574 const struct in6_addr *a2) 575 { 576 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 577 const unsigned long *ul1 = (const unsigned long *)a1; 578 const unsigned long *ul2 = (const unsigned long *)a2; 579 580 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL; 581 #else 582 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) | 583 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) | 584 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) | 585 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0; 586 #endif 587 } 588 589 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 590 static inline bool __ipv6_prefix_equal64_half(const __be64 *a1, 591 const __be64 *a2, 592 unsigned int len) 593 { 594 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len)))) 595 return false; 596 return true; 597 } 598 599 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1, 600 const struct in6_addr *addr2, 601 unsigned int prefixlen) 602 { 603 const __be64 *a1 = (const __be64 *)addr1; 604 const __be64 *a2 = (const __be64 *)addr2; 605 606 if (prefixlen >= 64) { 607 if (a1[0] ^ a2[0]) 608 return false; 609 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64); 610 } 611 return __ipv6_prefix_equal64_half(a1, a2, prefixlen); 612 } 613 #else 614 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1, 615 const struct in6_addr *addr2, 616 unsigned int prefixlen) 617 { 618 const __be32 *a1 = addr1->s6_addr32; 619 const __be32 *a2 = addr2->s6_addr32; 620 unsigned int pdw, pbi; 621 622 /* check complete u32 in prefix */ 623 pdw = prefixlen >> 5; 624 if (pdw && memcmp(a1, a2, pdw << 2)) 625 return false; 626 627 /* check incomplete u32 in prefix */ 628 pbi = prefixlen & 0x1f; 629 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi)))) 630 return false; 631 632 return true; 633 } 634 #endif 635 636 static inline bool ipv6_addr_any(const struct in6_addr *a) 637 { 638 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 639 const unsigned long *ul = (const unsigned long *)a; 640 641 return (ul[0] | ul[1]) == 0UL; 642 #else 643 return (a->s6_addr32[0] | a->s6_addr32[1] | 644 a->s6_addr32[2] | a->s6_addr32[3]) == 0; 645 #endif 646 } 647 648 static inline u32 ipv6_addr_hash(const struct in6_addr *a) 649 { 650 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 651 const unsigned long *ul = (const unsigned long *)a; 652 unsigned long x = ul[0] ^ ul[1]; 653 654 return (u32)(x ^ (x >> 32)); 655 #else 656 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^ 657 a->s6_addr32[2] ^ a->s6_addr32[3]); 658 #endif 659 } 660 661 /* more secured version of ipv6_addr_hash() */ 662 static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval) 663 { 664 u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1]; 665 666 return jhash_3words(v, 667 (__force u32)a->s6_addr32[2], 668 (__force u32)a->s6_addr32[3], 669 initval); 670 } 671 672 static inline bool ipv6_addr_loopback(const struct in6_addr *a) 673 { 674 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 675 const __be64 *be = (const __be64 *)a; 676 677 return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL; 678 #else 679 return (a->s6_addr32[0] | a->s6_addr32[1] | 680 a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0; 681 #endif 682 } 683 684 /* 685 * Note that we must __force cast these to unsigned long to make sparse happy, 686 * since all of the endian-annotated types are fixed size regardless of arch. 687 */ 688 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a) 689 { 690 return ( 691 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 692 *(unsigned long *)a | 693 #else 694 (__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) | 695 #endif 696 (__force unsigned long)(a->s6_addr32[2] ^ 697 cpu_to_be32(0x0000ffff))) == 0UL; 698 } 699 700 static inline bool ipv6_addr_v4mapped_loopback(const struct in6_addr *a) 701 { 702 return ipv6_addr_v4mapped(a) && ipv4_is_loopback(a->s6_addr32[3]); 703 } 704 705 static inline u32 ipv6_portaddr_hash(const struct net *net, 706 const struct in6_addr *addr6, 707 unsigned int port) 708 { 709 unsigned int hash, mix = net_hash_mix(net); 710 711 if (ipv6_addr_any(addr6)) 712 hash = jhash_1word(0, mix); 713 else if (ipv6_addr_v4mapped(addr6)) 714 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix); 715 else 716 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix); 717 718 return hash ^ port; 719 } 720 721 /* 722 * Check for a RFC 4843 ORCHID address 723 * (Overlay Routable Cryptographic Hash Identifiers) 724 */ 725 static inline bool ipv6_addr_orchid(const struct in6_addr *a) 726 { 727 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010); 728 } 729 730 static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr) 731 { 732 return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000); 733 } 734 735 static inline void ipv6_addr_set_v4mapped(const __be32 addr, 736 struct in6_addr *v4mapped) 737 { 738 ipv6_addr_set(v4mapped, 739 0, 0, 740 htonl(0x0000FFFF), 741 addr); 742 } 743 744 /* 745 * find the first different bit between two addresses 746 * length of address must be a multiple of 32bits 747 */ 748 static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen) 749 { 750 const __be32 *a1 = token1, *a2 = token2; 751 int i; 752 753 addrlen >>= 2; 754 755 for (i = 0; i < addrlen; i++) { 756 __be32 xb = a1[i] ^ a2[i]; 757 if (xb) 758 return i * 32 + 31 - __fls(ntohl(xb)); 759 } 760 761 /* 762 * we should *never* get to this point since that 763 * would mean the addrs are equal 764 * 765 * However, we do get to it 8) And exacly, when 766 * addresses are equal 8) 767 * 768 * ip route add 1111::/128 via ... 769 * ip route add 1111::/64 via ... 770 * and we are here. 771 * 772 * Ideally, this function should stop comparison 773 * at prefix length. It does not, but it is still OK, 774 * if returned value is greater than prefix length. 775 * --ANK (980803) 776 */ 777 return addrlen << 5; 778 } 779 780 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 781 static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen) 782 { 783 const __be64 *a1 = token1, *a2 = token2; 784 int i; 785 786 addrlen >>= 3; 787 788 for (i = 0; i < addrlen; i++) { 789 __be64 xb = a1[i] ^ a2[i]; 790 if (xb) 791 return i * 64 + 63 - __fls(be64_to_cpu(xb)); 792 } 793 794 return addrlen << 6; 795 } 796 #endif 797 798 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen) 799 { 800 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 801 if (__builtin_constant_p(addrlen) && !(addrlen & 7)) 802 return __ipv6_addr_diff64(token1, token2, addrlen); 803 #endif 804 return __ipv6_addr_diff32(token1, token2, addrlen); 805 } 806 807 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2) 808 { 809 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr)); 810 } 811 812 __be32 ipv6_select_ident(struct net *net, 813 const struct in6_addr *daddr, 814 const struct in6_addr *saddr); 815 __be32 ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb); 816 817 int ip6_dst_hoplimit(struct dst_entry *dst); 818 819 static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6, 820 struct dst_entry *dst) 821 { 822 int hlimit; 823 824 if (ipv6_addr_is_multicast(&fl6->daddr)) 825 hlimit = np->mcast_hops; 826 else 827 hlimit = np->hop_limit; 828 if (hlimit < 0) 829 hlimit = ip6_dst_hoplimit(dst); 830 return hlimit; 831 } 832 833 /* copy IPv6 saddr & daddr to flow_keys, possibly using 64bit load/store 834 * Equivalent to : flow->v6addrs.src = iph->saddr; 835 * flow->v6addrs.dst = iph->daddr; 836 */ 837 static inline void iph_to_flow_copy_v6addrs(struct flow_keys *flow, 838 const struct ipv6hdr *iph) 839 { 840 BUILD_BUG_ON(offsetof(typeof(flow->addrs), v6addrs.dst) != 841 offsetof(typeof(flow->addrs), v6addrs.src) + 842 sizeof(flow->addrs.v6addrs.src)); 843 memcpy(&flow->addrs.v6addrs, &iph->saddr, sizeof(flow->addrs.v6addrs)); 844 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; 845 } 846 847 #if IS_ENABLED(CONFIG_IPV6) 848 849 static inline bool ipv6_can_nonlocal_bind(struct net *net, 850 struct inet_sock *inet) 851 { 852 return net->ipv6.sysctl.ip_nonlocal_bind || 853 inet->freebind || inet->transparent; 854 } 855 856 /* Sysctl settings for net ipv6.auto_flowlabels */ 857 #define IP6_AUTO_FLOW_LABEL_OFF 0 858 #define IP6_AUTO_FLOW_LABEL_OPTOUT 1 859 #define IP6_AUTO_FLOW_LABEL_OPTIN 2 860 #define IP6_AUTO_FLOW_LABEL_FORCED 3 861 862 #define IP6_AUTO_FLOW_LABEL_MAX IP6_AUTO_FLOW_LABEL_FORCED 863 864 #define IP6_DEFAULT_AUTO_FLOW_LABELS IP6_AUTO_FLOW_LABEL_OPTOUT 865 866 static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb, 867 __be32 flowlabel, bool autolabel, 868 struct flowi6 *fl6) 869 { 870 u32 hash; 871 872 /* @flowlabel may include more than a flow label, eg, the traffic class. 873 * Here we want only the flow label value. 874 */ 875 flowlabel &= IPV6_FLOWLABEL_MASK; 876 877 if (flowlabel || 878 net->ipv6.sysctl.auto_flowlabels == IP6_AUTO_FLOW_LABEL_OFF || 879 (!autolabel && 880 net->ipv6.sysctl.auto_flowlabels != IP6_AUTO_FLOW_LABEL_FORCED)) 881 return flowlabel; 882 883 hash = skb_get_hash_flowi6(skb, fl6); 884 885 /* Since this is being sent on the wire obfuscate hash a bit 886 * to minimize possbility that any useful information to an 887 * attacker is leaked. Only lower 20 bits are relevant. 888 */ 889 hash = rol32(hash, 16); 890 891 flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK; 892 893 if (net->ipv6.sysctl.flowlabel_state_ranges) 894 flowlabel |= IPV6_FLOWLABEL_STATELESS_FLAG; 895 896 return flowlabel; 897 } 898 899 static inline int ip6_default_np_autolabel(struct net *net) 900 { 901 switch (net->ipv6.sysctl.auto_flowlabels) { 902 case IP6_AUTO_FLOW_LABEL_OFF: 903 case IP6_AUTO_FLOW_LABEL_OPTIN: 904 default: 905 return 0; 906 case IP6_AUTO_FLOW_LABEL_OPTOUT: 907 case IP6_AUTO_FLOW_LABEL_FORCED: 908 return 1; 909 } 910 } 911 #else 912 static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb, 913 __be32 flowlabel, bool autolabel, 914 struct flowi6 *fl6) 915 { 916 return flowlabel; 917 } 918 static inline int ip6_default_np_autolabel(struct net *net) 919 { 920 return 0; 921 } 922 #endif 923 924 #if IS_ENABLED(CONFIG_IPV6) 925 static inline int ip6_multipath_hash_policy(const struct net *net) 926 { 927 return net->ipv6.sysctl.multipath_hash_policy; 928 } 929 static inline u32 ip6_multipath_hash_fields(const struct net *net) 930 { 931 return net->ipv6.sysctl.multipath_hash_fields; 932 } 933 #else 934 static inline int ip6_multipath_hash_policy(const struct net *net) 935 { 936 return 0; 937 } 938 static inline u32 ip6_multipath_hash_fields(const struct net *net) 939 { 940 return 0; 941 } 942 #endif 943 944 /* 945 * Header manipulation 946 */ 947 static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass, 948 __be32 flowlabel) 949 { 950 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel; 951 } 952 953 static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr) 954 { 955 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK; 956 } 957 958 static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr) 959 { 960 return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK; 961 } 962 963 static inline u8 ip6_tclass(__be32 flowinfo) 964 { 965 return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT; 966 } 967 968 static inline __be32 ip6_make_flowinfo(unsigned int tclass, __be32 flowlabel) 969 { 970 return htonl(tclass << IPV6_TCLASS_SHIFT) | flowlabel; 971 } 972 973 static inline __be32 flowi6_get_flowlabel(const struct flowi6 *fl6) 974 { 975 return fl6->flowlabel & IPV6_FLOWLABEL_MASK; 976 } 977 978 /* 979 * Prototypes exported by ipv6 980 */ 981 982 /* 983 * rcv function (called from netdevice level) 984 */ 985 986 int ipv6_rcv(struct sk_buff *skb, struct net_device *dev, 987 struct packet_type *pt, struct net_device *orig_dev); 988 void ipv6_list_rcv(struct list_head *head, struct packet_type *pt, 989 struct net_device *orig_dev); 990 991 int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 992 993 /* 994 * upper-layer output functions 995 */ 996 int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6, 997 __u32 mark, struct ipv6_txoptions *opt, int tclass, u32 priority); 998 999 int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr); 1000 1001 int ip6_append_data(struct sock *sk, 1002 int getfrag(void *from, char *to, int offset, int len, 1003 int odd, struct sk_buff *skb), 1004 void *from, int length, int transhdrlen, 1005 struct ipcm6_cookie *ipc6, struct flowi6 *fl6, 1006 struct rt6_info *rt, unsigned int flags); 1007 1008 int ip6_push_pending_frames(struct sock *sk); 1009 1010 void ip6_flush_pending_frames(struct sock *sk); 1011 1012 int ip6_send_skb(struct sk_buff *skb); 1013 1014 struct sk_buff *__ip6_make_skb(struct sock *sk, struct sk_buff_head *queue, 1015 struct inet_cork_full *cork, 1016 struct inet6_cork *v6_cork); 1017 struct sk_buff *ip6_make_skb(struct sock *sk, 1018 int getfrag(void *from, char *to, int offset, 1019 int len, int odd, struct sk_buff *skb), 1020 void *from, int length, int transhdrlen, 1021 struct ipcm6_cookie *ipc6, struct flowi6 *fl6, 1022 struct rt6_info *rt, unsigned int flags, 1023 struct inet_cork_full *cork); 1024 1025 static inline struct sk_buff *ip6_finish_skb(struct sock *sk) 1026 { 1027 return __ip6_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork, 1028 &inet6_sk(sk)->cork); 1029 } 1030 1031 int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst, 1032 struct flowi6 *fl6); 1033 struct dst_entry *ip6_dst_lookup_flow(struct net *net, const struct sock *sk, struct flowi6 *fl6, 1034 const struct in6_addr *final_dst); 1035 struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6, 1036 const struct in6_addr *final_dst, 1037 bool connected); 1038 struct dst_entry *ip6_dst_lookup_tunnel(struct sk_buff *skb, 1039 struct net_device *dev, 1040 struct net *net, struct socket *sock, 1041 struct in6_addr *saddr, 1042 const struct ip_tunnel_info *info, 1043 u8 protocol, bool use_cache); 1044 struct dst_entry *ip6_blackhole_route(struct net *net, 1045 struct dst_entry *orig_dst); 1046 1047 /* 1048 * skb processing functions 1049 */ 1050 1051 int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb); 1052 int ip6_forward(struct sk_buff *skb); 1053 int ip6_input(struct sk_buff *skb); 1054 int ip6_mc_input(struct sk_buff *skb); 1055 void ip6_protocol_deliver_rcu(struct net *net, struct sk_buff *skb, int nexthdr, 1056 bool have_final); 1057 1058 int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); 1059 int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); 1060 1061 /* 1062 * Extension header (options) processing 1063 */ 1064 1065 void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, 1066 u8 *proto, struct in6_addr **daddr_p, 1067 struct in6_addr *saddr); 1068 void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, 1069 u8 *proto); 1070 1071 int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp, 1072 __be16 *frag_offp); 1073 1074 bool ipv6_ext_hdr(u8 nexthdr); 1075 1076 enum { 1077 IP6_FH_F_FRAG = (1 << 0), 1078 IP6_FH_F_AUTH = (1 << 1), 1079 IP6_FH_F_SKIP_RH = (1 << 2), 1080 }; 1081 1082 /* find specified header and get offset to it */ 1083 int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target, 1084 unsigned short *fragoff, int *fragflg); 1085 1086 int ipv6_find_tlv(const struct sk_buff *skb, int offset, int type); 1087 1088 struct in6_addr *fl6_update_dst(struct flowi6 *fl6, 1089 const struct ipv6_txoptions *opt, 1090 struct in6_addr *orig); 1091 1092 /* 1093 * socket options (ipv6_sockglue.c) 1094 */ 1095 DECLARE_STATIC_KEY_FALSE(ip6_min_hopcount); 1096 1097 int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, 1098 unsigned int optlen); 1099 int ipv6_getsockopt(struct sock *sk, int level, int optname, 1100 char __user *optval, int __user *optlen); 1101 1102 int __ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, 1103 int addr_len); 1104 int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len); 1105 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr, 1106 int addr_len); 1107 int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr); 1108 void ip6_datagram_release_cb(struct sock *sk); 1109 1110 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, 1111 int *addr_len); 1112 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len, 1113 int *addr_len); 1114 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, 1115 u32 info, u8 *payload); 1116 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info); 1117 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu); 1118 1119 int inet6_release(struct socket *sock); 1120 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len); 1121 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 1122 int peer); 1123 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg); 1124 int inet6_compat_ioctl(struct socket *sock, unsigned int cmd, 1125 unsigned long arg); 1126 1127 int inet6_hash_connect(struct inet_timewait_death_row *death_row, 1128 struct sock *sk); 1129 int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size); 1130 int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 1131 int flags); 1132 1133 /* 1134 * reassembly.c 1135 */ 1136 extern const struct proto_ops inet6_stream_ops; 1137 extern const struct proto_ops inet6_dgram_ops; 1138 extern const struct proto_ops inet6_sockraw_ops; 1139 1140 struct group_source_req; 1141 struct group_filter; 1142 1143 int ip6_mc_source(int add, int omode, struct sock *sk, 1144 struct group_source_req *pgsr); 1145 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf, 1146 struct sockaddr_storage *list); 1147 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 1148 struct sockaddr_storage __user *p); 1149 1150 #ifdef CONFIG_PROC_FS 1151 int ac6_proc_init(struct net *net); 1152 void ac6_proc_exit(struct net *net); 1153 int raw6_proc_init(void); 1154 void raw6_proc_exit(void); 1155 int tcp6_proc_init(struct net *net); 1156 void tcp6_proc_exit(struct net *net); 1157 int udp6_proc_init(struct net *net); 1158 void udp6_proc_exit(struct net *net); 1159 int udplite6_proc_init(void); 1160 void udplite6_proc_exit(void); 1161 int ipv6_misc_proc_init(void); 1162 void ipv6_misc_proc_exit(void); 1163 int snmp6_register_dev(struct inet6_dev *idev); 1164 int snmp6_unregister_dev(struct inet6_dev *idev); 1165 1166 #else 1167 static inline int ac6_proc_init(struct net *net) { return 0; } 1168 static inline void ac6_proc_exit(struct net *net) { } 1169 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; } 1170 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; } 1171 #endif 1172 1173 #ifdef CONFIG_SYSCTL 1174 struct ctl_table *ipv6_icmp_sysctl_init(struct net *net); 1175 struct ctl_table *ipv6_route_sysctl_init(struct net *net); 1176 int ipv6_sysctl_register(void); 1177 void ipv6_sysctl_unregister(void); 1178 #endif 1179 1180 int ipv6_sock_mc_join(struct sock *sk, int ifindex, 1181 const struct in6_addr *addr); 1182 int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex, 1183 const struct in6_addr *addr, unsigned int mode); 1184 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, 1185 const struct in6_addr *addr); 1186 1187 static inline int ip6_sock_set_v6only(struct sock *sk) 1188 { 1189 if (inet_sk(sk)->inet_num) 1190 return -EINVAL; 1191 lock_sock(sk); 1192 sk->sk_ipv6only = true; 1193 release_sock(sk); 1194 return 0; 1195 } 1196 1197 static inline void ip6_sock_set_recverr(struct sock *sk) 1198 { 1199 lock_sock(sk); 1200 inet6_sk(sk)->recverr = true; 1201 release_sock(sk); 1202 } 1203 1204 static inline int __ip6_sock_set_addr_preferences(struct sock *sk, int val) 1205 { 1206 unsigned int pref = 0; 1207 unsigned int prefmask = ~0; 1208 1209 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */ 1210 switch (val & (IPV6_PREFER_SRC_PUBLIC | 1211 IPV6_PREFER_SRC_TMP | 1212 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) { 1213 case IPV6_PREFER_SRC_PUBLIC: 1214 pref |= IPV6_PREFER_SRC_PUBLIC; 1215 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC | 1216 IPV6_PREFER_SRC_TMP); 1217 break; 1218 case IPV6_PREFER_SRC_TMP: 1219 pref |= IPV6_PREFER_SRC_TMP; 1220 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC | 1221 IPV6_PREFER_SRC_TMP); 1222 break; 1223 case IPV6_PREFER_SRC_PUBTMP_DEFAULT: 1224 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC | 1225 IPV6_PREFER_SRC_TMP); 1226 break; 1227 case 0: 1228 break; 1229 default: 1230 return -EINVAL; 1231 } 1232 1233 /* check HOME/COA conflicts */ 1234 switch (val & (IPV6_PREFER_SRC_HOME | IPV6_PREFER_SRC_COA)) { 1235 case IPV6_PREFER_SRC_HOME: 1236 prefmask &= ~IPV6_PREFER_SRC_COA; 1237 break; 1238 case IPV6_PREFER_SRC_COA: 1239 pref |= IPV6_PREFER_SRC_COA; 1240 break; 1241 case 0: 1242 break; 1243 default: 1244 return -EINVAL; 1245 } 1246 1247 /* check CGA/NONCGA conflicts */ 1248 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) { 1249 case IPV6_PREFER_SRC_CGA: 1250 case IPV6_PREFER_SRC_NONCGA: 1251 case 0: 1252 break; 1253 default: 1254 return -EINVAL; 1255 } 1256 1257 inet6_sk(sk)->srcprefs = (inet6_sk(sk)->srcprefs & prefmask) | pref; 1258 return 0; 1259 } 1260 1261 static inline int ip6_sock_set_addr_preferences(struct sock *sk, bool val) 1262 { 1263 int ret; 1264 1265 lock_sock(sk); 1266 ret = __ip6_sock_set_addr_preferences(sk, val); 1267 release_sock(sk); 1268 return ret; 1269 } 1270 1271 static inline void ip6_sock_set_recvpktinfo(struct sock *sk) 1272 { 1273 lock_sock(sk); 1274 inet6_sk(sk)->rxopt.bits.rxinfo = true; 1275 release_sock(sk); 1276 } 1277 1278 #endif /* _NET_IPV6_H */ 1279