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/flow.h> 19 #include <net/flow_dissector.h> 20 #include <net/inet_dscp.h> 21 #include <net/snmp.h> 22 #include <net/netns/hash.h> 23 24 struct ip_tunnel_info; 25 26 #define SIN6_LEN_RFC2133 24 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 unsigned long _field = (field); \ 237 unsigned long _val = (val); \ 238 if (likely(_idev != NULL)) \ 239 mod##SNMP_ADD_STATS((_idev)->stats.statname, _field, _val); \ 240 mod##SNMP_ADD_STATS((net)->mib.statname##_statistics, _field, _val);\ 241 }) 242 243 #define _DEVUPD(net, statname, mod, idev, field, val) \ 244 ({ \ 245 struct inet6_dev *_idev = (idev); \ 246 unsigned long _val = (val); \ 247 if (likely(_idev != NULL)) \ 248 mod##SNMP_UPD_PO_STATS((_idev)->stats.statname, field, _val); \ 249 mod##SNMP_UPD_PO_STATS((net)->mib.statname##_statistics, field, _val);\ 250 }) 251 252 /* MIBs */ 253 254 #define IP6_INC_STATS(net, idev,field) \ 255 _DEVINC(net, ipv6, , idev, field) 256 #define __IP6_INC_STATS(net, idev,field) \ 257 _DEVINC(net, ipv6, __, idev, field) 258 #define IP6_ADD_STATS(net, idev,field,val) \ 259 _DEVADD(net, ipv6, , idev, field, val) 260 #define __IP6_ADD_STATS(net, idev,field,val) \ 261 _DEVADD(net, ipv6, __, idev, field, val) 262 #define IP6_UPD_PO_STATS(net, idev,field,val) \ 263 _DEVUPD(net, ipv6, , idev, field, val) 264 #define __IP6_UPD_PO_STATS(net, idev,field,val) \ 265 _DEVUPD(net, ipv6, __, idev, field, val) 266 #define ICMP6_INC_STATS(net, idev, field) \ 267 _DEVINCATOMIC(net, icmpv6, , idev, field) 268 #define __ICMP6_INC_STATS(net, idev, field) \ 269 _DEVINCATOMIC(net, icmpv6, __, idev, field) 270 271 #define ICMP6MSGOUT_INC_STATS(net, idev, field) \ 272 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256) 273 #define ICMP6MSGIN_INC_STATS(net, idev, field) \ 274 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field) 275 276 struct ip6_ra_chain { 277 struct ip6_ra_chain *next; 278 struct sock *sk; 279 int sel; 280 void (*destructor)(struct sock *); 281 }; 282 283 extern struct ip6_ra_chain *ip6_ra_chain; 284 extern rwlock_t ip6_ra_lock; 285 286 /* 287 This structure is prepared by protocol, when parsing 288 ancillary data and passed to IPv6. 289 */ 290 291 struct ipv6_txoptions { 292 refcount_t refcnt; 293 /* Length of this structure */ 294 int tot_len; 295 296 /* length of extension headers */ 297 298 __u16 opt_flen; /* after fragment hdr */ 299 __u16 opt_nflen; /* before fragment hdr */ 300 301 struct ipv6_opt_hdr *hopopt; 302 struct ipv6_opt_hdr *dst0opt; 303 struct ipv6_rt_hdr *srcrt; /* Routing Header */ 304 struct ipv6_opt_hdr *dst1opt; 305 struct rcu_head rcu; 306 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */ 307 }; 308 309 /* flowlabel_reflect sysctl values */ 310 enum flowlabel_reflect { 311 FLOWLABEL_REFLECT_ESTABLISHED = 1, 312 FLOWLABEL_REFLECT_TCP_RESET = 2, 313 FLOWLABEL_REFLECT_ICMPV6_ECHO_REPLIES = 4, 314 }; 315 316 struct ip6_flowlabel { 317 struct ip6_flowlabel __rcu *next; 318 __be32 label; 319 atomic_t users; 320 struct in6_addr dst; 321 struct ipv6_txoptions *opt; 322 unsigned long linger; 323 struct rcu_head rcu; 324 u8 share; 325 union { 326 struct pid *pid; 327 kuid_t uid; 328 } owner; 329 unsigned long lastuse; 330 unsigned long expires; 331 struct net *fl_net; 332 }; 333 334 #define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF) 335 #define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF) 336 #define IPV6_FLOWLABEL_STATELESS_FLAG cpu_to_be32(0x00080000) 337 338 #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK) 339 #define IPV6_TCLASS_SHIFT 20 340 341 struct ipv6_fl_socklist { 342 struct ipv6_fl_socklist __rcu *next; 343 struct ip6_flowlabel *fl; 344 struct rcu_head rcu; 345 }; 346 347 struct ipcm6_cookie { 348 struct sockcm_cookie sockc; 349 __s16 hlimit; 350 __s16 tclass; 351 __u16 gso_size; 352 __s8 dontfrag; 353 struct ipv6_txoptions *opt; 354 }; 355 356 static inline void ipcm6_init_sk(struct ipcm6_cookie *ipc6, 357 const struct sock *sk) 358 { 359 *ipc6 = (struct ipcm6_cookie) { 360 .hlimit = -1, 361 .tclass = inet6_sk(sk)->tclass, 362 .dontfrag = inet6_test_bit(DONTFRAG, sk), 363 }; 364 365 sockcm_init(&ipc6->sockc, sk); 366 } 367 368 static inline struct ipv6_txoptions *txopt_get(const struct ipv6_pinfo *np) 369 { 370 struct ipv6_txoptions *opt; 371 372 rcu_read_lock(); 373 opt = rcu_dereference(np->opt); 374 if (opt) { 375 if (!refcount_inc_not_zero(&opt->refcnt)) 376 opt = NULL; 377 else 378 opt = rcu_pointer_handoff(opt); 379 } 380 rcu_read_unlock(); 381 return opt; 382 } 383 384 static inline void txopt_put(struct ipv6_txoptions *opt) 385 { 386 if (opt && refcount_dec_and_test(&opt->refcnt)) 387 kfree_rcu(opt, rcu); 388 } 389 390 #if IS_ENABLED(CONFIG_IPV6) 391 struct ip6_flowlabel *__fl6_sock_lookup(struct sock *sk, __be32 label); 392 393 extern struct static_key_false_deferred ipv6_flowlabel_exclusive; 394 static inline struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, 395 __be32 label) 396 { 397 if (static_branch_unlikely(&ipv6_flowlabel_exclusive.key) && 398 READ_ONCE(sock_net(sk)->ipv6.flowlabel_has_excl)) 399 return __fl6_sock_lookup(sk, label) ? : ERR_PTR(-ENOENT); 400 401 return NULL; 402 } 403 #endif 404 405 struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space, 406 struct ip6_flowlabel *fl, 407 struct ipv6_txoptions *fopt); 408 void fl6_free_socklist(struct sock *sk); 409 int ipv6_flowlabel_opt(struct sock *sk, sockptr_t optval, int optlen); 410 int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq, 411 int flags); 412 int ip6_flowlabel_init(void); 413 void ip6_flowlabel_cleanup(void); 414 bool ip6_autoflowlabel(struct net *net, const struct sock *sk); 415 416 static inline void fl6_sock_release(struct ip6_flowlabel *fl) 417 { 418 if (fl) 419 atomic_dec(&fl->users); 420 } 421 422 enum skb_drop_reason icmpv6_notify(struct sk_buff *skb, u8 type, 423 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 static inline struct ipv6_txoptions * 442 ipv6_fixup_options(struct ipv6_txoptions *opt_space, struct ipv6_txoptions *opt) 443 { 444 if (!opt) 445 return NULL; 446 return __ipv6_fixup_options(opt_space, opt); 447 } 448 449 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb, 450 const struct inet6_skb_parm *opt); 451 struct ipv6_txoptions *ipv6_update_options(struct sock *sk, 452 struct ipv6_txoptions *opt); 453 454 static inline bool ipv6_accept_ra(const struct inet6_dev *idev) 455 { 456 s32 accept_ra = READ_ONCE(idev->cnf.accept_ra); 457 458 /* If forwarding is enabled, RA are not accepted unless the special 459 * hybrid mode (accept_ra=2) is enabled. 460 */ 461 return READ_ONCE(idev->cnf.forwarding) ? accept_ra == 2 : 462 accept_ra; 463 } 464 465 #define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */ 466 #define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */ 467 #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */ 468 469 int __ipv6_addr_type(const struct in6_addr *addr); 470 static inline int ipv6_addr_type(const struct in6_addr *addr) 471 { 472 return __ipv6_addr_type(addr) & 0xffff; 473 } 474 475 static inline int ipv6_addr_scope(const struct in6_addr *addr) 476 { 477 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK; 478 } 479 480 static inline int __ipv6_addr_src_scope(int type) 481 { 482 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16); 483 } 484 485 static inline int ipv6_addr_src_scope(const struct in6_addr *addr) 486 { 487 return __ipv6_addr_src_scope(__ipv6_addr_type(addr)); 488 } 489 490 static inline bool __ipv6_addr_needs_scope_id(int type) 491 { 492 return type & IPV6_ADDR_LINKLOCAL || 493 (type & IPV6_ADDR_MULTICAST && 494 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL))); 495 } 496 497 static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface) 498 { 499 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0; 500 } 501 502 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2) 503 { 504 return memcmp(a1, a2, sizeof(struct in6_addr)); 505 } 506 507 static inline bool 508 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m, 509 const struct in6_addr *a2) 510 { 511 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 512 const unsigned long *ul1 = (const unsigned long *)a1; 513 const unsigned long *ulm = (const unsigned long *)m; 514 const unsigned long *ul2 = (const unsigned long *)a2; 515 516 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) | 517 ((ul1[1] ^ ul2[1]) & ulm[1])); 518 #else 519 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) | 520 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) | 521 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) | 522 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3])); 523 #endif 524 } 525 526 static inline void ipv6_addr_prefix(struct in6_addr *pfx, 527 const struct in6_addr *addr, 528 int plen) 529 { 530 /* caller must guarantee 0 <= plen <= 128 */ 531 int o = plen >> 3, 532 b = plen & 0x7; 533 534 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr)); 535 memcpy(pfx->s6_addr, addr, o); 536 if (b != 0) 537 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b); 538 } 539 540 static inline void ipv6_addr_prefix_copy(struct in6_addr *addr, 541 const struct in6_addr *pfx, 542 int plen) 543 { 544 /* caller must guarantee 0 <= plen <= 128 */ 545 int o = plen >> 3, 546 b = plen & 0x7; 547 548 memcpy(addr->s6_addr, pfx, o); 549 if (b != 0) { 550 addr->s6_addr[o] &= ~(0xff00 >> b); 551 addr->s6_addr[o] |= (pfx->s6_addr[o] & (0xff00 >> b)); 552 } 553 } 554 555 static inline void __ipv6_addr_set_half(__be32 *addr, 556 __be32 wh, __be32 wl) 557 { 558 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 559 #if defined(__BIG_ENDIAN) 560 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) { 561 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl)); 562 return; 563 } 564 #elif defined(__LITTLE_ENDIAN) 565 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) { 566 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh)); 567 return; 568 } 569 #endif 570 #endif 571 addr[0] = wh; 572 addr[1] = wl; 573 } 574 575 static inline void ipv6_addr_set(struct in6_addr *addr, 576 __be32 w1, __be32 w2, 577 __be32 w3, __be32 w4) 578 { 579 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2); 580 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4); 581 } 582 583 static inline bool ipv6_addr_equal(const struct in6_addr *a1, 584 const struct in6_addr *a2) 585 { 586 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 587 const unsigned long *ul1 = (const unsigned long *)a1; 588 const unsigned long *ul2 = (const unsigned long *)a2; 589 590 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL; 591 #else 592 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) | 593 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) | 594 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) | 595 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0; 596 #endif 597 } 598 599 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 600 static inline bool __ipv6_prefix_equal64_half(const __be64 *a1, 601 const __be64 *a2, 602 unsigned int len) 603 { 604 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len)))) 605 return false; 606 return true; 607 } 608 609 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1, 610 const struct in6_addr *addr2, 611 unsigned int prefixlen) 612 { 613 const __be64 *a1 = (const __be64 *)addr1; 614 const __be64 *a2 = (const __be64 *)addr2; 615 616 if (prefixlen >= 64) { 617 if (a1[0] ^ a2[0]) 618 return false; 619 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64); 620 } 621 return __ipv6_prefix_equal64_half(a1, a2, prefixlen); 622 } 623 #else 624 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1, 625 const struct in6_addr *addr2, 626 unsigned int prefixlen) 627 { 628 const __be32 *a1 = addr1->s6_addr32; 629 const __be32 *a2 = addr2->s6_addr32; 630 unsigned int pdw, pbi; 631 632 /* check complete u32 in prefix */ 633 pdw = prefixlen >> 5; 634 if (pdw && memcmp(a1, a2, pdw << 2)) 635 return false; 636 637 /* check incomplete u32 in prefix */ 638 pbi = prefixlen & 0x1f; 639 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi)))) 640 return false; 641 642 return true; 643 } 644 #endif 645 646 static inline bool ipv6_addr_any(const struct in6_addr *a) 647 { 648 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 649 const unsigned long *ul = (const unsigned long *)a; 650 651 return (ul[0] | ul[1]) == 0UL; 652 #else 653 return (a->s6_addr32[0] | a->s6_addr32[1] | 654 a->s6_addr32[2] | a->s6_addr32[3]) == 0; 655 #endif 656 } 657 658 static inline u32 ipv6_addr_hash(const struct in6_addr *a) 659 { 660 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 661 const unsigned long *ul = (const unsigned long *)a; 662 unsigned long x = ul[0] ^ ul[1]; 663 664 return (u32)(x ^ (x >> 32)); 665 #else 666 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^ 667 a->s6_addr32[2] ^ a->s6_addr32[3]); 668 #endif 669 } 670 671 /* more secured version of ipv6_addr_hash() */ 672 static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval) 673 { 674 return jhash2((__force const u32 *)a->s6_addr32, 675 ARRAY_SIZE(a->s6_addr32), initval); 676 } 677 678 static inline bool ipv6_addr_loopback(const struct in6_addr *a) 679 { 680 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 681 const __be64 *be = (const __be64 *)a; 682 683 return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL; 684 #else 685 return (a->s6_addr32[0] | a->s6_addr32[1] | 686 a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0; 687 #endif 688 } 689 690 /* 691 * Note that we must __force cast these to unsigned long to make sparse happy, 692 * since all of the endian-annotated types are fixed size regardless of arch. 693 */ 694 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a) 695 { 696 return ( 697 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 698 *(unsigned long *)a | 699 #else 700 (__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) | 701 #endif 702 (__force unsigned long)(a->s6_addr32[2] ^ 703 cpu_to_be32(0x0000ffff))) == 0UL; 704 } 705 706 static inline bool ipv6_addr_v4mapped_loopback(const struct in6_addr *a) 707 { 708 return ipv6_addr_v4mapped(a) && ipv4_is_loopback(a->s6_addr32[3]); 709 } 710 711 static inline u32 ipv6_portaddr_hash(const struct net *net, 712 const struct in6_addr *addr6, 713 unsigned int port) 714 { 715 unsigned int hash, mix = net_hash_mix(net); 716 717 if (ipv6_addr_any(addr6)) 718 hash = jhash_1word(0, mix); 719 else if (ipv6_addr_v4mapped(addr6)) 720 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix); 721 else 722 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix); 723 724 return hash ^ port; 725 } 726 727 /* 728 * Check for a RFC 4843 ORCHID address 729 * (Overlay Routable Cryptographic Hash Identifiers) 730 */ 731 static inline bool ipv6_addr_orchid(const struct in6_addr *a) 732 { 733 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010); 734 } 735 736 static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr) 737 { 738 return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000); 739 } 740 741 static inline void ipv6_addr_set_v4mapped(const __be32 addr, 742 struct in6_addr *v4mapped) 743 { 744 ipv6_addr_set(v4mapped, 745 0, 0, 746 htonl(0x0000FFFF), 747 addr); 748 } 749 750 /* 751 * find the first different bit between two addresses 752 * length of address must be a multiple of 32bits 753 */ 754 static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen) 755 { 756 const __be32 *a1 = token1, *a2 = token2; 757 int i; 758 759 addrlen >>= 2; 760 761 for (i = 0; i < addrlen; i++) { 762 __be32 xb = a1[i] ^ a2[i]; 763 if (xb) 764 return i * 32 + 31 - __fls(ntohl(xb)); 765 } 766 767 /* 768 * we should *never* get to this point since that 769 * would mean the addrs are equal 770 * 771 * However, we do get to it 8) And exactly, when 772 * addresses are equal 8) 773 * 774 * ip route add 1111::/128 via ... 775 * ip route add 1111::/64 via ... 776 * and we are here. 777 * 778 * Ideally, this function should stop comparison 779 * at prefix length. It does not, but it is still OK, 780 * if returned value is greater than prefix length. 781 * --ANK (980803) 782 */ 783 return addrlen << 5; 784 } 785 786 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 787 static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen) 788 { 789 const __be64 *a1 = token1, *a2 = token2; 790 int i; 791 792 addrlen >>= 3; 793 794 for (i = 0; i < addrlen; i++) { 795 __be64 xb = a1[i] ^ a2[i]; 796 if (xb) 797 return i * 64 + 63 - __fls(be64_to_cpu(xb)); 798 } 799 800 return addrlen << 6; 801 } 802 #endif 803 804 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen) 805 { 806 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 807 if (__builtin_constant_p(addrlen) && !(addrlen & 7)) 808 return __ipv6_addr_diff64(token1, token2, addrlen); 809 #endif 810 return __ipv6_addr_diff32(token1, token2, addrlen); 811 } 812 813 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2) 814 { 815 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr)); 816 } 817 818 __be32 ipv6_select_ident(struct net *net, 819 const struct in6_addr *daddr, 820 const struct in6_addr *saddr); 821 __be32 ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb); 822 823 int ip6_dst_hoplimit(struct dst_entry *dst); 824 825 static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6, 826 struct dst_entry *dst) 827 { 828 int hlimit; 829 830 if (ipv6_addr_is_multicast(&fl6->daddr)) 831 hlimit = READ_ONCE(np->mcast_hops); 832 else 833 hlimit = READ_ONCE(np->hop_limit); 834 if (hlimit < 0) 835 hlimit = ip6_dst_hoplimit(dst); 836 return hlimit; 837 } 838 839 /* copy IPv6 saddr & daddr to flow_keys, possibly using 64bit load/store 840 * Equivalent to : flow->v6addrs.src = iph->saddr; 841 * flow->v6addrs.dst = iph->daddr; 842 */ 843 static inline void iph_to_flow_copy_v6addrs(struct flow_keys *flow, 844 const struct ipv6hdr *iph) 845 { 846 BUILD_BUG_ON(offsetof(typeof(flow->addrs), v6addrs.dst) != 847 offsetof(typeof(flow->addrs), v6addrs.src) + 848 sizeof(flow->addrs.v6addrs.src)); 849 memcpy(&flow->addrs.v6addrs, &iph->addrs, sizeof(flow->addrs.v6addrs)); 850 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; 851 } 852 853 #if IS_ENABLED(CONFIG_IPV6) 854 855 static inline bool ipv6_can_nonlocal_bind(const struct net *net, 856 const struct inet_sock *inet) 857 { 858 return READ_ONCE(net->ipv6.sysctl.ip_nonlocal_bind) || 859 test_bit(INET_FLAGS_FREEBIND, &inet->inet_flags) || 860 test_bit(INET_FLAGS_TRANSPARENT, &inet->inet_flags); 861 } 862 863 /* Sysctl settings for net ipv6.auto_flowlabels */ 864 #define IP6_AUTO_FLOW_LABEL_OFF 0 865 #define IP6_AUTO_FLOW_LABEL_OPTOUT 1 866 #define IP6_AUTO_FLOW_LABEL_OPTIN 2 867 #define IP6_AUTO_FLOW_LABEL_FORCED 3 868 869 #define IP6_AUTO_FLOW_LABEL_MAX IP6_AUTO_FLOW_LABEL_FORCED 870 871 #define IP6_DEFAULT_AUTO_FLOW_LABELS IP6_AUTO_FLOW_LABEL_OPTOUT 872 873 static inline __be32 ip6_make_flowlabel(const struct net *net, 874 struct sk_buff *skb, 875 __be32 flowlabel, bool autolabel, 876 struct flowi6 *fl6) 877 { 878 u8 auto_flowlabels; 879 u32 hash; 880 881 /* @flowlabel may include more than a flow label, eg, the traffic class. 882 * Here we want only the flow label value. 883 */ 884 flowlabel &= IPV6_FLOWLABEL_MASK; 885 886 if (flowlabel) 887 return flowlabel; 888 889 auto_flowlabels = READ_ONCE(net->ipv6.sysctl.auto_flowlabels); 890 if (auto_flowlabels == IP6_AUTO_FLOW_LABEL_OFF || 891 (!autolabel && auto_flowlabels != IP6_AUTO_FLOW_LABEL_FORCED)) 892 return flowlabel; 893 894 hash = skb_get_hash_flowi6(skb, fl6); 895 896 /* Since this is being sent on the wire obfuscate hash a bit 897 * to minimize possibility that any useful information to an 898 * attacker is leaked. Only lower 20 bits are relevant. 899 */ 900 hash = rol32(hash, 16); 901 902 flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK; 903 904 if (READ_ONCE(net->ipv6.sysctl.flowlabel_state_ranges)) 905 flowlabel |= IPV6_FLOWLABEL_STATELESS_FLAG; 906 907 return flowlabel; 908 } 909 910 static inline int ip6_default_np_autolabel(const struct net *net) 911 { 912 switch (READ_ONCE(net->ipv6.sysctl.auto_flowlabels)) { 913 case IP6_AUTO_FLOW_LABEL_OFF: 914 case IP6_AUTO_FLOW_LABEL_OPTIN: 915 default: 916 return 0; 917 case IP6_AUTO_FLOW_LABEL_OPTOUT: 918 case IP6_AUTO_FLOW_LABEL_FORCED: 919 return 1; 920 } 921 } 922 #else 923 static inline __be32 ip6_make_flowlabel(const struct net *net, struct sk_buff *skb, 924 __be32 flowlabel, bool autolabel, 925 struct flowi6 *fl6) 926 { 927 return flowlabel; 928 } 929 static inline int ip6_default_np_autolabel(const struct net *net) 930 { 931 return 0; 932 } 933 #endif 934 935 #if IS_ENABLED(CONFIG_IPV6) 936 static inline int ip6_multipath_hash_policy(const struct net *net) 937 { 938 return READ_ONCE(net->ipv6.sysctl.multipath_hash_policy); 939 } 940 static inline u32 ip6_multipath_hash_fields(const struct net *net) 941 { 942 return READ_ONCE(net->ipv6.sysctl.multipath_hash_fields); 943 } 944 #else 945 static inline int ip6_multipath_hash_policy(const struct net *net) 946 { 947 return 0; 948 } 949 static inline u32 ip6_multipath_hash_fields(const struct net *net) 950 { 951 return 0; 952 } 953 #endif 954 955 /* 956 * Header manipulation 957 */ 958 static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass, 959 __be32 flowlabel) 960 { 961 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel; 962 } 963 964 static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr) 965 { 966 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK; 967 } 968 969 static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr) 970 { 971 return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK; 972 } 973 974 static inline u8 ip6_tclass(__be32 flowinfo) 975 { 976 return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT; 977 } 978 979 static inline dscp_t ip6_dscp(__be32 flowinfo) 980 { 981 return inet_dsfield_to_dscp(ip6_tclass(flowinfo)); 982 } 983 984 static inline __be32 ip6_make_flowinfo(unsigned int tclass, __be32 flowlabel) 985 { 986 return htonl(tclass << IPV6_TCLASS_SHIFT) | flowlabel; 987 } 988 989 static inline __be32 flowi6_get_flowlabel(const struct flowi6 *fl6) 990 { 991 return fl6->flowlabel & IPV6_FLOWLABEL_MASK; 992 } 993 994 /* 995 * Prototypes exported by ipv6 996 */ 997 998 /* 999 * rcv function (called from netdevice level) 1000 */ 1001 1002 int ipv6_rcv(struct sk_buff *skb, struct net_device *dev, 1003 struct packet_type *pt, struct net_device *orig_dev); 1004 void ipv6_list_rcv(struct list_head *head, struct packet_type *pt, 1005 struct net_device *orig_dev); 1006 1007 int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 1008 1009 /* 1010 * upper-layer output functions 1011 */ 1012 int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6, 1013 __u32 mark, struct ipv6_txoptions *opt, int tclass, u32 priority); 1014 1015 int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr); 1016 1017 int ip6_append_data(struct sock *sk, 1018 int getfrag(void *from, char *to, int offset, int len, 1019 int odd, struct sk_buff *skb), 1020 void *from, size_t length, int transhdrlen, 1021 struct ipcm6_cookie *ipc6, struct flowi6 *fl6, 1022 struct rt6_info *rt, unsigned int flags); 1023 1024 int ip6_push_pending_frames(struct sock *sk); 1025 1026 void ip6_flush_pending_frames(struct sock *sk); 1027 1028 int ip6_send_skb(struct sk_buff *skb); 1029 1030 struct sk_buff *__ip6_make_skb(struct sock *sk, struct sk_buff_head *queue, 1031 struct inet_cork_full *cork); 1032 struct sk_buff *ip6_make_skb(struct sock *sk, 1033 int getfrag(void *from, char *to, int offset, 1034 int len, int odd, struct sk_buff *skb), 1035 void *from, size_t length, int transhdrlen, 1036 struct ipcm6_cookie *ipc6, 1037 struct rt6_info *rt, unsigned int flags, 1038 struct inet_cork_full *cork); 1039 1040 static inline struct sk_buff *ip6_finish_skb(struct sock *sk) 1041 { 1042 return __ip6_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork); 1043 } 1044 1045 int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst, 1046 struct flowi6 *fl6); 1047 struct dst_entry *ip6_dst_lookup_flow(struct net *net, const struct sock *sk, struct flowi6 *fl6, 1048 const struct in6_addr *final_dst); 1049 struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6, 1050 const struct in6_addr *final_dst, 1051 bool connected); 1052 struct dst_entry *ip6_blackhole_route(struct net *net, 1053 struct dst_entry *orig_dst); 1054 1055 /* 1056 * skb processing functions 1057 */ 1058 1059 int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb); 1060 int ip6_forward(struct sk_buff *skb); 1061 int ip6_input(struct sk_buff *skb); 1062 int ip6_mc_input(struct sk_buff *skb); 1063 void ip6_protocol_deliver_rcu(struct net *net, struct sk_buff *skb, int nexthdr, 1064 bool have_final); 1065 1066 int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); 1067 int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); 1068 1069 /* 1070 * Extension header (options) processing 1071 */ 1072 1073 u8 ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, 1074 u8 proto, struct in6_addr **daddr_p, 1075 struct in6_addr *saddr); 1076 u8 ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, 1077 u8 proto); 1078 1079 int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp, 1080 __be16 *frag_offp); 1081 1082 bool ipv6_ext_hdr(u8 nexthdr); 1083 1084 enum { 1085 IP6_FH_F_FRAG = (1 << 0), 1086 IP6_FH_F_AUTH = (1 << 1), 1087 IP6_FH_F_SKIP_RH = (1 << 2), 1088 }; 1089 1090 /* find specified header and get offset to it */ 1091 int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target, 1092 unsigned short *fragoff, int *fragflg); 1093 1094 int ipv6_find_tlv(const struct sk_buff *skb, int offset, int type); 1095 1096 struct in6_addr *__fl6_update_dst(struct flowi6 *fl6, 1097 const struct ipv6_txoptions *opt, 1098 struct in6_addr *orig); 1099 1100 static inline struct in6_addr * 1101 fl6_update_dst(struct flowi6 *fl6, const struct ipv6_txoptions *opt, 1102 struct in6_addr *orig) 1103 { 1104 if (likely(!opt)) 1105 return NULL; 1106 1107 return __fl6_update_dst(fl6, opt, orig); 1108 } 1109 1110 /* 1111 * socket options (ipv6_sockglue.c) 1112 */ 1113 DECLARE_STATIC_KEY_FALSE(ip6_min_hopcount); 1114 1115 int do_ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, 1116 unsigned int optlen); 1117 int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, 1118 unsigned int optlen); 1119 int do_ipv6_getsockopt(struct sock *sk, int level, int optname, 1120 sockptr_t optval, sockptr_t optlen); 1121 int ipv6_getsockopt(struct sock *sk, int level, int optname, 1122 char __user *optval, int __user *optlen); 1123 1124 int __ip6_datagram_connect(struct sock *sk, struct sockaddr_unsized *addr, 1125 int addr_len); 1126 int ip6_datagram_connect(struct sock *sk, struct sockaddr_unsized *addr, int addr_len); 1127 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr_unsized *addr, 1128 int addr_len); 1129 int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr); 1130 void ip6_datagram_release_cb(struct sock *sk); 1131 1132 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, 1133 int *addr_len); 1134 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len, 1135 int *addr_len); 1136 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, 1137 u32 info, u8 *payload); 1138 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info); 1139 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu); 1140 1141 void inet6_cleanup_sock(struct sock *sk); 1142 void inet6_sock_destruct(struct sock *sk); 1143 int inet6_release(struct socket *sock); 1144 int inet6_bind(struct socket *sock, struct sockaddr_unsized *uaddr, int addr_len); 1145 int inet6_bind_sk(struct sock *sk, struct sockaddr_unsized *uaddr, int addr_len); 1146 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 1147 int peer); 1148 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg); 1149 int inet6_compat_ioctl(struct socket *sock, unsigned int cmd, 1150 unsigned long arg); 1151 1152 int inet6_hash_connect(struct inet_timewait_death_row *death_row, 1153 struct sock *sk); 1154 int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size); 1155 int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 1156 int flags); 1157 1158 /* 1159 * reassembly.c 1160 */ 1161 extern const struct proto_ops inet6_stream_ops; 1162 extern const struct proto_ops inet6_dgram_ops; 1163 extern const struct proto_ops inet6_sockraw_ops; 1164 1165 struct group_source_req; 1166 struct group_filter; 1167 1168 int ip6_mc_source(int add, int omode, struct sock *sk, 1169 struct group_source_req *pgsr); 1170 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf, 1171 struct sockaddr_storage *list); 1172 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 1173 sockptr_t optval, size_t ss_offset); 1174 1175 #ifdef CONFIG_PROC_FS 1176 int ac6_proc_init(struct net *net); 1177 void ac6_proc_exit(struct net *net); 1178 int raw6_proc_init(void); 1179 void raw6_proc_exit(void); 1180 int tcp6_proc_init(struct net *net); 1181 void tcp6_proc_exit(struct net *net); 1182 int udp6_proc_init(struct net *net); 1183 void udp6_proc_exit(struct net *net); 1184 int udplite6_proc_init(void); 1185 void udplite6_proc_exit(void); 1186 int ipv6_misc_proc_init(void); 1187 void ipv6_misc_proc_exit(void); 1188 int snmp6_register_dev(struct inet6_dev *idev); 1189 int snmp6_unregister_dev(struct inet6_dev *idev); 1190 1191 #else 1192 static inline int ac6_proc_init(struct net *net) { return 0; } 1193 static inline void ac6_proc_exit(struct net *net) { } 1194 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; } 1195 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; } 1196 #endif 1197 1198 #ifdef CONFIG_SYSCTL 1199 struct ctl_table *ipv6_icmp_sysctl_init(struct net *net); 1200 size_t ipv6_icmp_sysctl_table_size(void); 1201 struct ctl_table *ipv6_route_sysctl_init(struct net *net); 1202 size_t ipv6_route_sysctl_table_size(struct net *net); 1203 int ipv6_sysctl_register(void); 1204 void ipv6_sysctl_unregister(void); 1205 #endif 1206 1207 int ipv6_sock_mc_join(struct sock *sk, int ifindex, 1208 const struct in6_addr *addr); 1209 int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex, 1210 const struct in6_addr *addr, unsigned int mode); 1211 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, 1212 const struct in6_addr *addr); 1213 1214 static inline int ip6_sock_set_v6only(struct sock *sk) 1215 { 1216 if (inet_sk(sk)->inet_num) 1217 return -EINVAL; 1218 lock_sock(sk); 1219 sk->sk_ipv6only = true; 1220 release_sock(sk); 1221 return 0; 1222 } 1223 1224 static inline void ip6_sock_set_recverr(struct sock *sk) 1225 { 1226 inet6_set_bit(RECVERR6, sk); 1227 } 1228 1229 #define IPV6_PREFER_SRC_MASK (IPV6_PREFER_SRC_TMP | IPV6_PREFER_SRC_PUBLIC | \ 1230 IPV6_PREFER_SRC_COA) 1231 1232 static inline int ip6_sock_set_addr_preferences(struct sock *sk, int val) 1233 { 1234 unsigned int prefmask = ~IPV6_PREFER_SRC_MASK; 1235 unsigned int pref = 0; 1236 1237 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */ 1238 switch (val & (IPV6_PREFER_SRC_PUBLIC | 1239 IPV6_PREFER_SRC_TMP | 1240 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) { 1241 case IPV6_PREFER_SRC_PUBLIC: 1242 pref |= IPV6_PREFER_SRC_PUBLIC; 1243 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC | 1244 IPV6_PREFER_SRC_TMP); 1245 break; 1246 case IPV6_PREFER_SRC_TMP: 1247 pref |= IPV6_PREFER_SRC_TMP; 1248 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC | 1249 IPV6_PREFER_SRC_TMP); 1250 break; 1251 case IPV6_PREFER_SRC_PUBTMP_DEFAULT: 1252 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC | 1253 IPV6_PREFER_SRC_TMP); 1254 break; 1255 case 0: 1256 break; 1257 default: 1258 return -EINVAL; 1259 } 1260 1261 /* check HOME/COA conflicts */ 1262 switch (val & (IPV6_PREFER_SRC_HOME | IPV6_PREFER_SRC_COA)) { 1263 case IPV6_PREFER_SRC_HOME: 1264 prefmask &= ~IPV6_PREFER_SRC_COA; 1265 break; 1266 case IPV6_PREFER_SRC_COA: 1267 pref |= IPV6_PREFER_SRC_COA; 1268 break; 1269 case 0: 1270 break; 1271 default: 1272 return -EINVAL; 1273 } 1274 1275 /* check CGA/NONCGA conflicts */ 1276 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) { 1277 case IPV6_PREFER_SRC_CGA: 1278 case IPV6_PREFER_SRC_NONCGA: 1279 case 0: 1280 break; 1281 default: 1282 return -EINVAL; 1283 } 1284 1285 WRITE_ONCE(inet6_sk(sk)->srcprefs, 1286 (READ_ONCE(inet6_sk(sk)->srcprefs) & prefmask) | pref); 1287 return 0; 1288 } 1289 1290 static inline void ip6_sock_set_recvpktinfo(struct sock *sk) 1291 { 1292 lock_sock(sk); 1293 inet6_sk(sk)->rxopt.bits.rxinfo = true; 1294 release_sock(sk); 1295 } 1296 1297 #define IPV6_ADDR_WORDS 4 1298 1299 static inline void ipv6_addr_cpu_to_be32(__be32 *dst, const u32 *src) 1300 { 1301 cpu_to_be32_array(dst, src, IPV6_ADDR_WORDS); 1302 } 1303 1304 static inline void ipv6_addr_be32_to_cpu(u32 *dst, const __be32 *src) 1305 { 1306 be32_to_cpu_array(dst, src, IPV6_ADDR_WORDS); 1307 } 1308 1309 #endif /* _NET_IPV6_H */ 1310