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 /* Hard limit on traversed IPv6 extension headers */ 94 #define IP6_MAX_EXT_HDRS_CNT 12 95 96 /* 97 * Addr type 98 * 99 * type - unicast | multicast 100 * scope - local | site | global 101 * v4 - compat 102 * v4mapped 103 * any 104 * loopback 105 */ 106 107 #define IPV6_ADDR_ANY 0x0000U 108 109 #define IPV6_ADDR_UNICAST 0x0001U 110 #define IPV6_ADDR_MULTICAST 0x0002U 111 112 #define IPV6_ADDR_LOOPBACK 0x0010U 113 #define IPV6_ADDR_LINKLOCAL 0x0020U 114 #define IPV6_ADDR_SITELOCAL 0x0040U 115 116 #define IPV6_ADDR_COMPATv4 0x0080U 117 118 #define IPV6_ADDR_SCOPE_MASK 0x00f0U 119 120 #define IPV6_ADDR_MAPPED 0x1000U 121 122 /* 123 * Addr scopes 124 */ 125 #define IPV6_ADDR_MC_SCOPE(a) \ 126 ((a)->s6_addr[1] & 0x0f) /* nonstandard */ 127 #define __IPV6_ADDR_SCOPE_INVALID -1 128 #define IPV6_ADDR_SCOPE_NODELOCAL 0x01 129 #define IPV6_ADDR_SCOPE_LINKLOCAL 0x02 130 #define IPV6_ADDR_SCOPE_SITELOCAL 0x05 131 #define IPV6_ADDR_SCOPE_ORGLOCAL 0x08 132 #define IPV6_ADDR_SCOPE_GLOBAL 0x0e 133 134 /* 135 * Addr flags 136 */ 137 #define IPV6_ADDR_MC_FLAG_TRANSIENT(a) \ 138 ((a)->s6_addr[1] & 0x10) 139 #define IPV6_ADDR_MC_FLAG_PREFIX(a) \ 140 ((a)->s6_addr[1] & 0x20) 141 #define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \ 142 ((a)->s6_addr[1] & 0x40) 143 144 /* 145 * fragmentation header 146 */ 147 148 struct frag_hdr { 149 __u8 nexthdr; 150 __u8 reserved; 151 __be16 frag_off; 152 __be32 identification; 153 }; 154 155 #define IP6_MF 0x0001 156 #define IP6_OFFSET 0xFFF8 157 158 struct ip6_fraglist_iter { 159 struct ipv6hdr *tmp_hdr; 160 struct sk_buff *frag; 161 int offset; 162 unsigned int hlen; 163 __be32 frag_id; 164 u8 nexthdr; 165 }; 166 167 int ip6_fraglist_init(struct sk_buff *skb, unsigned int hlen, u8 *prevhdr, 168 u8 nexthdr, __be32 frag_id, 169 struct ip6_fraglist_iter *iter); 170 void ip6_fraglist_prepare(struct sk_buff *skb, struct ip6_fraglist_iter *iter); 171 172 static inline struct sk_buff *ip6_fraglist_next(struct ip6_fraglist_iter *iter) 173 { 174 struct sk_buff *skb = iter->frag; 175 176 iter->frag = skb->next; 177 skb_mark_not_on_list(skb); 178 179 return skb; 180 } 181 182 struct ip6_frag_state { 183 u8 *prevhdr; 184 unsigned int hlen; 185 unsigned int mtu; 186 unsigned int left; 187 int offset; 188 int ptr; 189 int hroom; 190 int troom; 191 __be32 frag_id; 192 u8 nexthdr; 193 }; 194 195 void ip6_frag_init(struct sk_buff *skb, unsigned int hlen, unsigned int mtu, 196 unsigned short needed_tailroom, int hdr_room, u8 *prevhdr, 197 u8 nexthdr, __be32 frag_id, struct ip6_frag_state *state); 198 struct sk_buff *ip6_frag_next(struct sk_buff *skb, 199 struct ip6_frag_state *state); 200 201 #define IP6_REPLY_MARK(net, mark) \ 202 ((net)->ipv6.sysctl.fwmark_reflect ? (mark) : 0) 203 204 #include <net/sock.h> 205 206 /* sysctls */ 207 extern int sysctl_mld_max_msf; 208 extern int sysctl_mld_qrv; 209 210 #define _DEVINC(net, statname, mod, idev, field) \ 211 ({ \ 212 struct inet6_dev *_idev = (idev); \ 213 if (likely(_idev != NULL)) \ 214 mod##SNMP_INC_STATS64((_idev)->stats.statname, (field));\ 215 mod##SNMP_INC_STATS64((net)->mib.statname##_statistics, (field));\ 216 }) 217 218 /* per device counters are atomic_long_t */ 219 #define _DEVINCATOMIC(net, statname, mod, idev, field) \ 220 ({ \ 221 struct inet6_dev *_idev = (idev); \ 222 if (likely(_idev != NULL)) \ 223 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \ 224 mod##SNMP_INC_STATS((net)->mib.statname##_statistics, (field));\ 225 }) 226 227 /* per device and per net counters are atomic_long_t */ 228 #define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \ 229 ({ \ 230 struct inet6_dev *_idev = (idev); \ 231 if (likely(_idev != NULL)) \ 232 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \ 233 SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\ 234 }) 235 236 #define _DEVADD(net, statname, mod, idev, field, val) \ 237 ({ \ 238 struct inet6_dev *_idev = (idev); \ 239 unsigned long _field = (field); \ 240 unsigned long _val = (val); \ 241 if (likely(_idev != NULL)) \ 242 mod##SNMP_ADD_STATS((_idev)->stats.statname, _field, _val); \ 243 mod##SNMP_ADD_STATS((net)->mib.statname##_statistics, _field, _val);\ 244 }) 245 246 #define _DEVUPD(net, statname, mod, idev, field, val) \ 247 ({ \ 248 struct inet6_dev *_idev = (idev); \ 249 unsigned long _val = (val); \ 250 if (likely(_idev != NULL)) \ 251 mod##SNMP_UPD_PO_STATS((_idev)->stats.statname, field, _val); \ 252 mod##SNMP_UPD_PO_STATS((net)->mib.statname##_statistics, field, _val);\ 253 }) 254 255 /* MIBs */ 256 257 #define IP6_INC_STATS(net, idev,field) \ 258 _DEVINC(net, ipv6, , idev, field) 259 #define __IP6_INC_STATS(net, idev,field) \ 260 _DEVINC(net, ipv6, __, idev, field) 261 #define IP6_ADD_STATS(net, idev,field,val) \ 262 _DEVADD(net, ipv6, , idev, field, val) 263 #define __IP6_ADD_STATS(net, idev,field,val) \ 264 _DEVADD(net, ipv6, __, idev, field, val) 265 #define IP6_UPD_PO_STATS(net, idev,field,val) \ 266 _DEVUPD(net, ipv6, , idev, field, val) 267 #define __IP6_UPD_PO_STATS(net, idev,field,val) \ 268 _DEVUPD(net, ipv6, __, idev, field, val) 269 #define ICMP6_INC_STATS(net, idev, field) \ 270 _DEVINCATOMIC(net, icmpv6, , idev, field) 271 #define __ICMP6_INC_STATS(net, idev, field) \ 272 _DEVINCATOMIC(net, icmpv6, __, idev, field) 273 274 #define ICMP6MSGOUT_INC_STATS(net, idev, field) \ 275 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256) 276 #define ICMP6MSGIN_INC_STATS(net, idev, field) \ 277 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field) 278 279 struct ip6_ra_chain { 280 struct ip6_ra_chain *next; 281 struct sock *sk; 282 int sel; 283 void (*destructor)(struct sock *); 284 }; 285 286 extern struct ip6_ra_chain *ip6_ra_chain; 287 extern rwlock_t ip6_ra_lock; 288 289 /* 290 This structure is prepared by protocol, when parsing 291 ancillary data and passed to IPv6. 292 */ 293 294 struct ipv6_txoptions { 295 refcount_t refcnt; 296 /* Length of this structure */ 297 int tot_len; 298 299 /* length of extension headers */ 300 301 __u16 opt_flen; /* after fragment hdr */ 302 __u16 opt_nflen; /* before fragment hdr */ 303 304 struct ipv6_opt_hdr *hopopt; 305 struct ipv6_opt_hdr *dst0opt; 306 struct ipv6_rt_hdr *srcrt; /* Routing Header */ 307 struct ipv6_opt_hdr *dst1opt; 308 struct rcu_head rcu; 309 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */ 310 }; 311 312 /* flowlabel_reflect sysctl values */ 313 enum flowlabel_reflect { 314 FLOWLABEL_REFLECT_ESTABLISHED = 1, 315 FLOWLABEL_REFLECT_TCP_RESET = 2, 316 FLOWLABEL_REFLECT_ICMPV6_ECHO_REPLIES = 4, 317 }; 318 319 struct ip6_flowlabel { 320 struct ip6_flowlabel __rcu *next; 321 __be32 label; 322 atomic_t users; 323 struct in6_addr dst; 324 struct ipv6_txoptions *opt; 325 unsigned long linger; 326 struct rcu_head rcu; 327 u8 share; 328 union { 329 struct pid *pid; 330 kuid_t uid; 331 } owner; 332 unsigned long lastuse; 333 unsigned long expires; 334 struct net *fl_net; 335 }; 336 337 #define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF) 338 #define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF) 339 #define IPV6_FLOWLABEL_STATELESS_FLAG cpu_to_be32(0x00080000) 340 341 #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK) 342 #define IPV6_TCLASS_SHIFT 20 343 344 struct ipv6_fl_socklist { 345 struct ipv6_fl_socklist __rcu *next; 346 struct ip6_flowlabel *fl; 347 struct rcu_head rcu; 348 }; 349 350 struct ipcm6_cookie { 351 struct sockcm_cookie sockc; 352 __s16 hlimit; 353 __s16 tclass; 354 __u16 gso_size; 355 __s8 dontfrag; 356 struct ipv6_txoptions *opt; 357 }; 358 359 static inline void ipcm6_init_sk(struct ipcm6_cookie *ipc6, 360 const struct sock *sk) 361 { 362 *ipc6 = (struct ipcm6_cookie) { 363 .hlimit = -1, 364 .tclass = inet6_sk(sk)->tclass, 365 .dontfrag = inet6_test_bit(DONTFRAG, sk), 366 }; 367 368 sockcm_init(&ipc6->sockc, sk); 369 } 370 371 static 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 } 386 387 static 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) 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 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 407 408 struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space, 409 struct ip6_flowlabel *fl, 410 struct ipv6_txoptions *fopt); 411 void fl6_free_socklist(struct sock *sk); 412 int ipv6_flowlabel_opt(struct sock *sk, sockptr_t optval, int optlen); 413 int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq, 414 int flags); 415 int ip6_flowlabel_init(void); 416 void ip6_flowlabel_cleanup(void); 417 bool ip6_autoflowlabel(struct net *net, const struct sock *sk); 418 419 static inline void fl6_sock_release(struct ip6_flowlabel *fl) 420 { 421 if (fl) 422 atomic_dec(&fl->users); 423 } 424 425 enum skb_drop_reason icmpv6_notify(struct sk_buff *skb, u8 type, 426 u8 code, __be32 info); 427 428 void icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, 429 struct icmp6hdr *thdr, int len); 430 431 int ip6_ra_control(struct sock *sk, int sel); 432 433 int ipv6_parse_hopopts(struct sk_buff *skb); 434 435 struct ipv6_txoptions *ipv6_dup_options(struct sock *sk, 436 struct ipv6_txoptions *opt); 437 struct ipv6_txoptions *ipv6_renew_options(struct sock *sk, 438 struct ipv6_txoptions *opt, 439 int newtype, 440 struct ipv6_opt_hdr *newopt); 441 struct ipv6_txoptions *__ipv6_fixup_options(struct ipv6_txoptions *opt_space, 442 struct ipv6_txoptions *opt); 443 444 static inline struct ipv6_txoptions * 445 ipv6_fixup_options(struct ipv6_txoptions *opt_space, struct ipv6_txoptions *opt) 446 { 447 if (!opt) 448 return NULL; 449 return __ipv6_fixup_options(opt_space, opt); 450 } 451 452 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb, 453 const struct inet6_skb_parm *opt); 454 struct ipv6_txoptions *ipv6_update_options(struct sock *sk, 455 struct ipv6_txoptions *opt); 456 457 static inline bool ipv6_accept_ra(const struct inet6_dev *idev) 458 { 459 s32 accept_ra = READ_ONCE(idev->cnf.accept_ra); 460 461 /* If forwarding is enabled, RA are not accepted unless the special 462 * hybrid mode (accept_ra=2) is enabled. 463 */ 464 return READ_ONCE(idev->cnf.forwarding) ? accept_ra == 2 : 465 accept_ra; 466 } 467 468 #define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */ 469 #define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */ 470 #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */ 471 472 int __ipv6_addr_type(const struct in6_addr *addr); 473 static inline int ipv6_addr_type(const struct in6_addr *addr) 474 { 475 return __ipv6_addr_type(addr) & 0xffff; 476 } 477 478 static inline int ipv6_addr_scope(const struct in6_addr *addr) 479 { 480 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK; 481 } 482 483 static inline int __ipv6_addr_src_scope(int type) 484 { 485 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16); 486 } 487 488 static inline int ipv6_addr_src_scope(const struct in6_addr *addr) 489 { 490 return __ipv6_addr_src_scope(__ipv6_addr_type(addr)); 491 } 492 493 static inline bool __ipv6_addr_needs_scope_id(int type) 494 { 495 return type & IPV6_ADDR_LINKLOCAL || 496 (type & IPV6_ADDR_MULTICAST && 497 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL))); 498 } 499 500 static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface) 501 { 502 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0; 503 } 504 505 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2) 506 { 507 return memcmp(a1, a2, sizeof(struct in6_addr)); 508 } 509 510 static inline bool 511 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m, 512 const struct in6_addr *a2) 513 { 514 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 515 const unsigned long *ul1 = (const unsigned long *)a1; 516 const unsigned long *ulm = (const unsigned long *)m; 517 const unsigned long *ul2 = (const unsigned long *)a2; 518 519 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) | 520 ((ul1[1] ^ ul2[1]) & ulm[1])); 521 #else 522 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) | 523 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) | 524 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) | 525 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3])); 526 #endif 527 } 528 529 static inline void ipv6_addr_prefix(struct in6_addr *pfx, 530 const struct in6_addr *addr, 531 int plen) 532 { 533 /* caller must guarantee 0 <= plen <= 128 */ 534 int o = plen >> 3, 535 b = plen & 0x7; 536 537 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr)); 538 memcpy(pfx->s6_addr, addr, o); 539 if (b != 0) 540 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b); 541 } 542 543 static inline void ipv6_addr_prefix_copy(struct in6_addr *addr, 544 const struct in6_addr *pfx, 545 int plen) 546 { 547 /* caller must guarantee 0 <= plen <= 128 */ 548 int o = plen >> 3, 549 b = plen & 0x7; 550 551 memcpy(addr->s6_addr, pfx, o); 552 if (b != 0) { 553 addr->s6_addr[o] &= ~(0xff00 >> b); 554 addr->s6_addr[o] |= (pfx->s6_addr[o] & (0xff00 >> b)); 555 } 556 } 557 558 static inline void __ipv6_addr_set_half(__be32 *addr, 559 __be32 wh, __be32 wl) 560 { 561 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 562 #if defined(__BIG_ENDIAN) 563 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) { 564 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl)); 565 return; 566 } 567 #elif defined(__LITTLE_ENDIAN) 568 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) { 569 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh)); 570 return; 571 } 572 #endif 573 #endif 574 addr[0] = wh; 575 addr[1] = wl; 576 } 577 578 static inline void ipv6_addr_set(struct in6_addr *addr, 579 __be32 w1, __be32 w2, 580 __be32 w3, __be32 w4) 581 { 582 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2); 583 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4); 584 } 585 586 static inline bool ipv6_addr_equal(const struct in6_addr *a1, 587 const struct in6_addr *a2) 588 { 589 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 590 const unsigned long *ul1 = (const unsigned long *)a1; 591 const unsigned long *ul2 = (const unsigned long *)a2; 592 593 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL; 594 #else 595 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) | 596 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) | 597 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) | 598 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0; 599 #endif 600 } 601 602 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 603 static inline bool __ipv6_prefix_equal64_half(const __be64 *a1, 604 const __be64 *a2, 605 unsigned int len) 606 { 607 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len)))) 608 return false; 609 return true; 610 } 611 612 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1, 613 const struct in6_addr *addr2, 614 unsigned int prefixlen) 615 { 616 const __be64 *a1 = (const __be64 *)addr1; 617 const __be64 *a2 = (const __be64 *)addr2; 618 619 if (prefixlen >= 64) { 620 if (a1[0] ^ a2[0]) 621 return false; 622 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64); 623 } 624 return __ipv6_prefix_equal64_half(a1, a2, prefixlen); 625 } 626 #else 627 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1, 628 const struct in6_addr *addr2, 629 unsigned int prefixlen) 630 { 631 const __be32 *a1 = addr1->s6_addr32; 632 const __be32 *a2 = addr2->s6_addr32; 633 unsigned int pdw, pbi; 634 635 /* check complete u32 in prefix */ 636 pdw = prefixlen >> 5; 637 if (pdw && memcmp(a1, a2, pdw << 2)) 638 return false; 639 640 /* check incomplete u32 in prefix */ 641 pbi = prefixlen & 0x1f; 642 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi)))) 643 return false; 644 645 return true; 646 } 647 #endif 648 649 static inline bool ipv6_addr_any(const struct in6_addr *a) 650 { 651 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 652 const unsigned long *ul = (const unsigned long *)a; 653 654 return (ul[0] | ul[1]) == 0UL; 655 #else 656 return (a->s6_addr32[0] | a->s6_addr32[1] | 657 a->s6_addr32[2] | a->s6_addr32[3]) == 0; 658 #endif 659 } 660 661 static inline u32 ipv6_addr_hash(const struct in6_addr *a) 662 { 663 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 664 const unsigned long *ul = (const unsigned long *)a; 665 unsigned long x = ul[0] ^ ul[1]; 666 667 return (u32)(x ^ (x >> 32)); 668 #else 669 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^ 670 a->s6_addr32[2] ^ a->s6_addr32[3]); 671 #endif 672 } 673 674 /* more secured version of ipv6_addr_hash() */ 675 static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval) 676 { 677 return jhash2((__force const u32 *)a->s6_addr32, 678 ARRAY_SIZE(a->s6_addr32), initval); 679 } 680 681 static inline bool ipv6_addr_loopback(const struct in6_addr *a) 682 { 683 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 684 const __be64 *be = (const __be64 *)a; 685 686 return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL; 687 #else 688 return (a->s6_addr32[0] | a->s6_addr32[1] | 689 a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0; 690 #endif 691 } 692 693 /* 694 * Note that we must __force cast these to unsigned long to make sparse happy, 695 * since all of the endian-annotated types are fixed size regardless of arch. 696 */ 697 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a) 698 { 699 return ( 700 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 701 *(unsigned long *)a | 702 #else 703 (__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) | 704 #endif 705 (__force unsigned long)(a->s6_addr32[2] ^ 706 cpu_to_be32(0x0000ffff))) == 0UL; 707 } 708 709 static inline bool ipv6_addr_v4mapped_loopback(const struct in6_addr *a) 710 { 711 return ipv6_addr_v4mapped(a) && ipv4_is_loopback(a->s6_addr32[3]); 712 } 713 714 static inline u32 ipv6_portaddr_hash(const struct net *net, 715 const struct in6_addr *addr6, 716 unsigned int port) 717 { 718 unsigned int hash, mix = net_hash_mix(net); 719 720 if (ipv6_addr_any(addr6)) 721 hash = jhash_1word(0, mix); 722 else if (ipv6_addr_v4mapped(addr6)) 723 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix); 724 else 725 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix); 726 727 return hash ^ port; 728 } 729 730 /* 731 * Check for a RFC 4843 ORCHID address 732 * (Overlay Routable Cryptographic Hash Identifiers) 733 */ 734 static inline bool ipv6_addr_orchid(const struct in6_addr *a) 735 { 736 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010); 737 } 738 739 static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr) 740 { 741 return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000); 742 } 743 744 static inline void ipv6_addr_set_v4mapped(const __be32 addr, 745 struct in6_addr *v4mapped) 746 { 747 ipv6_addr_set(v4mapped, 748 0, 0, 749 htonl(0x0000FFFF), 750 addr); 751 } 752 753 /* 754 * find the first different bit between two addresses 755 * length of address must be a multiple of 32bits 756 */ 757 static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen) 758 { 759 const __be32 *a1 = token1, *a2 = token2; 760 int i; 761 762 addrlen >>= 2; 763 764 for (i = 0; i < addrlen; i++) { 765 __be32 xb = a1[i] ^ a2[i]; 766 if (xb) 767 return i * 32 + 31 - __fls(ntohl(xb)); 768 } 769 770 /* 771 * we should *never* get to this point since that 772 * would mean the addrs are equal 773 * 774 * However, we do get to it 8) And exactly, when 775 * addresses are equal 8) 776 * 777 * ip route add 1111::/128 via ... 778 * ip route add 1111::/64 via ... 779 * and we are here. 780 * 781 * Ideally, this function should stop comparison 782 * at prefix length. It does not, but it is still OK, 783 * if returned value is greater than prefix length. 784 * --ANK (980803) 785 */ 786 return addrlen << 5; 787 } 788 789 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 790 static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen) 791 { 792 const __be64 *a1 = token1, *a2 = token2; 793 int i; 794 795 addrlen >>= 3; 796 797 for (i = 0; i < addrlen; i++) { 798 __be64 xb = a1[i] ^ a2[i]; 799 if (xb) 800 return i * 64 + 63 - __fls(be64_to_cpu(xb)); 801 } 802 803 return addrlen << 6; 804 } 805 #endif 806 807 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen) 808 { 809 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 810 if (__builtin_constant_p(addrlen) && !(addrlen & 7)) 811 return __ipv6_addr_diff64(token1, token2, addrlen); 812 #endif 813 return __ipv6_addr_diff32(token1, token2, addrlen); 814 } 815 816 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2) 817 { 818 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr)); 819 } 820 821 __be32 ipv6_select_ident(struct net *net, 822 const struct in6_addr *daddr, 823 const struct in6_addr *saddr); 824 __be32 ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb); 825 826 int ip6_dst_hoplimit(struct dst_entry *dst); 827 828 static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6, 829 struct dst_entry *dst) 830 { 831 int hlimit; 832 833 if (ipv6_addr_is_multicast(&fl6->daddr)) 834 hlimit = READ_ONCE(np->mcast_hops); 835 else 836 hlimit = READ_ONCE(np->hop_limit); 837 if (hlimit < 0) 838 hlimit = ip6_dst_hoplimit(dst); 839 return hlimit; 840 } 841 842 /* copy IPv6 saddr & daddr to flow_keys, possibly using 64bit load/store 843 * Equivalent to : flow->v6addrs.src = iph->saddr; 844 * flow->v6addrs.dst = iph->daddr; 845 */ 846 static inline void iph_to_flow_copy_v6addrs(struct flow_keys *flow, 847 const struct ipv6hdr *iph) 848 { 849 BUILD_BUG_ON(offsetof(typeof(flow->addrs), v6addrs.dst) != 850 offsetof(typeof(flow->addrs), v6addrs.src) + 851 sizeof(flow->addrs.v6addrs.src)); 852 memcpy(&flow->addrs.v6addrs, &iph->addrs, sizeof(flow->addrs.v6addrs)); 853 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; 854 } 855 856 #if IS_ENABLED(CONFIG_IPV6) 857 858 static inline bool ipv6_can_nonlocal_bind(const struct net *net, 859 const struct inet_sock *inet) 860 { 861 return READ_ONCE(net->ipv6.sysctl.ip_nonlocal_bind) || 862 test_bit(INET_FLAGS_FREEBIND, &inet->inet_flags) || 863 test_bit(INET_FLAGS_TRANSPARENT, &inet->inet_flags); 864 } 865 866 /* Sysctl settings for net ipv6.auto_flowlabels */ 867 #define IP6_AUTO_FLOW_LABEL_OFF 0 868 #define IP6_AUTO_FLOW_LABEL_OPTOUT 1 869 #define IP6_AUTO_FLOW_LABEL_OPTIN 2 870 #define IP6_AUTO_FLOW_LABEL_FORCED 3 871 872 #define IP6_AUTO_FLOW_LABEL_MAX IP6_AUTO_FLOW_LABEL_FORCED 873 874 #define IP6_DEFAULT_AUTO_FLOW_LABELS IP6_AUTO_FLOW_LABEL_OPTOUT 875 876 static inline __be32 ip6_make_flowlabel(const struct net *net, 877 struct sk_buff *skb, 878 __be32 flowlabel, bool autolabel, 879 struct flowi6 *fl6) 880 { 881 u8 auto_flowlabels; 882 u32 hash; 883 884 /* @flowlabel may include more than a flow label, eg, the traffic class. 885 * Here we want only the flow label value. 886 */ 887 flowlabel &= IPV6_FLOWLABEL_MASK; 888 889 if (flowlabel) 890 return flowlabel; 891 892 auto_flowlabels = READ_ONCE(net->ipv6.sysctl.auto_flowlabels); 893 if (auto_flowlabels == IP6_AUTO_FLOW_LABEL_OFF || 894 (!autolabel && auto_flowlabels != IP6_AUTO_FLOW_LABEL_FORCED)) 895 return flowlabel; 896 897 hash = skb_get_hash_flowi6(skb, fl6); 898 899 /* Since this is being sent on the wire obfuscate hash a bit 900 * to minimize possibility that any useful information to an 901 * attacker is leaked. Only lower 20 bits are relevant. 902 */ 903 hash = rol32(hash, 16); 904 905 flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK; 906 907 if (READ_ONCE(net->ipv6.sysctl.flowlabel_state_ranges)) 908 flowlabel |= IPV6_FLOWLABEL_STATELESS_FLAG; 909 910 return flowlabel; 911 } 912 913 static inline int ip6_default_np_autolabel(const struct net *net) 914 { 915 switch (READ_ONCE(net->ipv6.sysctl.auto_flowlabels)) { 916 case IP6_AUTO_FLOW_LABEL_OFF: 917 case IP6_AUTO_FLOW_LABEL_OPTIN: 918 default: 919 return 0; 920 case IP6_AUTO_FLOW_LABEL_OPTOUT: 921 case IP6_AUTO_FLOW_LABEL_FORCED: 922 return 1; 923 } 924 } 925 #else 926 static inline __be32 ip6_make_flowlabel(const struct net *net, struct sk_buff *skb, 927 __be32 flowlabel, bool autolabel, 928 struct flowi6 *fl6) 929 { 930 return flowlabel; 931 } 932 static inline int ip6_default_np_autolabel(const struct net *net) 933 { 934 return 0; 935 } 936 #endif 937 938 #if IS_ENABLED(CONFIG_IPV6) 939 static inline int ip6_multipath_hash_policy(const struct net *net) 940 { 941 return READ_ONCE(net->ipv6.sysctl.multipath_hash_policy); 942 } 943 static inline u32 ip6_multipath_hash_fields(const struct net *net) 944 { 945 return READ_ONCE(net->ipv6.sysctl.multipath_hash_fields); 946 } 947 #else 948 static inline int ip6_multipath_hash_policy(const struct net *net) 949 { 950 return 0; 951 } 952 static inline u32 ip6_multipath_hash_fields(const struct net *net) 953 { 954 return 0; 955 } 956 #endif 957 958 /* Derive the IPv6 ECMP hash from txhash so a rehash may pick a different path; 959 * policy 0 only, and only when txhash is set. >> 1 clears the top bit 960 * (fib6_select_path() uses mp_hash as a signed 31-bit value); ?: 1 keeps the 961 * result non-zero, since mp_hash 0 falls back to rt6_multipath_hash(). 962 */ 963 static inline void ip6_ecmp_set_mp_hash(const struct net *net, 964 struct flowi6 *fl6, u32 txhash) 965 { 966 if (ip6_multipath_hash_policy(net) == 0 && txhash) 967 fl6->mp_hash = (txhash >> 1) ?: 1; 968 } 969 970 /* 971 * Header manipulation 972 */ 973 static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass, 974 __be32 flowlabel) 975 { 976 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel; 977 } 978 979 static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr) 980 { 981 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK; 982 } 983 984 static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr) 985 { 986 return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK; 987 } 988 989 static inline u8 ip6_tclass(__be32 flowinfo) 990 { 991 return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT; 992 } 993 994 static inline dscp_t ip6_dscp(__be32 flowinfo) 995 { 996 return inet_dsfield_to_dscp(ip6_tclass(flowinfo)); 997 } 998 999 static inline __be32 ip6_make_flowinfo(unsigned int tclass, __be32 flowlabel) 1000 { 1001 return htonl(tclass << IPV6_TCLASS_SHIFT) | flowlabel; 1002 } 1003 1004 static inline __be32 flowi6_get_flowlabel(const struct flowi6 *fl6) 1005 { 1006 return fl6->flowlabel & IPV6_FLOWLABEL_MASK; 1007 } 1008 1009 /* 1010 * Prototypes exported by ipv6 1011 */ 1012 1013 /* 1014 * rcv function (called from netdevice level) 1015 */ 1016 1017 int ipv6_rcv(struct sk_buff *skb, struct net_device *dev, 1018 struct packet_type *pt, struct net_device *orig_dev); 1019 void ipv6_list_rcv(struct list_head *head, struct packet_type *pt, 1020 struct net_device *orig_dev); 1021 1022 int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 1023 1024 /* 1025 * upper-layer output functions 1026 */ 1027 int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6, 1028 __u32 mark, struct ipv6_txoptions *opt, int tclass, u32 priority); 1029 1030 int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr); 1031 1032 int ip6_append_data(struct sock *sk, 1033 int getfrag(void *from, char *to, int offset, int len, 1034 int odd, struct sk_buff *skb), 1035 void *from, size_t length, int transhdrlen, 1036 struct ipcm6_cookie *ipc6, struct flowi6 *fl6, 1037 struct rt6_info *rt, unsigned int flags); 1038 1039 int ip6_push_pending_frames(struct sock *sk); 1040 1041 void ip6_flush_pending_frames(struct sock *sk); 1042 1043 int ip6_send_skb(struct sk_buff *skb); 1044 1045 struct sk_buff *__ip6_make_skb(struct sock *sk, struct sk_buff_head *queue, 1046 struct inet_cork_full *cork); 1047 struct sk_buff *ip6_make_skb(struct sock *sk, 1048 int getfrag(void *from, char *to, int offset, 1049 int len, int odd, struct sk_buff *skb), 1050 void *from, size_t length, int transhdrlen, 1051 struct ipcm6_cookie *ipc6, 1052 struct rt6_info *rt, unsigned int flags, 1053 struct inet_cork_full *cork); 1054 1055 static inline struct sk_buff *ip6_finish_skb(struct sock *sk) 1056 { 1057 return __ip6_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork); 1058 } 1059 1060 int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst, 1061 struct flowi6 *fl6); 1062 #if IS_ENABLED(CONFIG_IPV6) 1063 struct dst_entry *ip6_dst_lookup_flow(struct net *net, const struct sock *sk, struct flowi6 *fl6, 1064 const struct in6_addr *final_dst); 1065 #else 1066 static inline struct dst_entry *ip6_dst_lookup_flow(struct net *net, const struct sock *sk, 1067 struct flowi6 *fl6, 1068 const struct in6_addr *final_dst) 1069 { 1070 return ERR_PTR(-EAFNOSUPPORT); 1071 } 1072 #endif 1073 1074 struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6, 1075 const struct in6_addr *final_dst, 1076 bool connected); 1077 struct dst_entry *ip6_blackhole_route(struct net *net, 1078 struct dst_entry *orig_dst); 1079 1080 /* 1081 * skb processing functions 1082 */ 1083 1084 int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb); 1085 int ip6_forward(struct sk_buff *skb); 1086 int ip6_input(struct sk_buff *skb); 1087 int ip6_mc_input(struct sk_buff *skb); 1088 void ip6_protocol_deliver_rcu(struct net *net, struct sk_buff *skb, int nexthdr, 1089 bool have_final); 1090 1091 int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); 1092 int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); 1093 1094 /* 1095 * Extension header (options) processing 1096 */ 1097 1098 u8 ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, 1099 u8 proto, struct in6_addr **daddr_p, 1100 struct in6_addr *saddr); 1101 u8 ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, 1102 u8 proto); 1103 1104 int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp, 1105 __be16 *frag_offp); 1106 1107 bool ipv6_ext_hdr(u8 nexthdr); 1108 1109 enum { 1110 IP6_FH_F_FRAG = (1 << 0), 1111 IP6_FH_F_AUTH = (1 << 1), 1112 IP6_FH_F_SKIP_RH = (1 << 2), 1113 }; 1114 1115 /* find specified header and get offset to it */ 1116 int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target, 1117 unsigned short *fragoff, int *fragflg); 1118 1119 int ipv6_find_tlv(const struct sk_buff *skb, int offset, int type); 1120 1121 struct in6_addr *__fl6_update_dst(struct flowi6 *fl6, 1122 const struct ipv6_txoptions *opt, 1123 struct in6_addr *orig); 1124 1125 static inline struct in6_addr * 1126 fl6_update_dst(struct flowi6 *fl6, const struct ipv6_txoptions *opt, 1127 struct in6_addr *orig) 1128 { 1129 if (likely(!opt)) 1130 return NULL; 1131 1132 return __fl6_update_dst(fl6, opt, orig); 1133 } 1134 1135 /* 1136 * socket options (ipv6_sockglue.c) 1137 */ 1138 DECLARE_STATIC_KEY_FALSE(ip6_min_hopcount); 1139 1140 int do_ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, 1141 unsigned int optlen); 1142 int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, 1143 unsigned int optlen); 1144 int do_ipv6_getsockopt(struct sock *sk, int level, int optname, 1145 sockptr_t optval, sockptr_t optlen); 1146 int ipv6_getsockopt(struct sock *sk, int level, int optname, 1147 char __user *optval, int __user *optlen); 1148 1149 int __ip6_datagram_connect(struct sock *sk, struct sockaddr_unsized *addr, 1150 int addr_len); 1151 int ip6_datagram_connect(struct sock *sk, struct sockaddr_unsized *addr, int addr_len); 1152 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr_unsized *addr, 1153 int addr_len); 1154 int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr); 1155 void ip6_datagram_release_cb(struct sock *sk); 1156 1157 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len); 1158 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len); 1159 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, 1160 u32 info, u8 *payload); 1161 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info); 1162 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu); 1163 1164 void inet6_cleanup_sock(struct sock *sk); 1165 void inet6_sock_destruct(struct sock *sk); 1166 int inet6_release(struct socket *sock); 1167 int __inet6_bind(struct sock *sk, struct sockaddr_unsized *uaddr, int addr_len, 1168 u32 flags); 1169 int inet6_bind(struct socket *sock, struct sockaddr_unsized *uaddr, int addr_len); 1170 int inet6_bind_sk(struct sock *sk, struct sockaddr_unsized *uaddr, int addr_len); 1171 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 1172 int peer); 1173 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg); 1174 int inet6_compat_ioctl(struct socket *sock, unsigned int cmd, 1175 unsigned long arg); 1176 1177 int inet6_hash_connect(struct inet_timewait_death_row *death_row, 1178 struct sock *sk); 1179 int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size); 1180 int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 1181 int flags); 1182 1183 /* 1184 * reassembly.c 1185 */ 1186 extern const struct proto_ops inet6_stream_ops; 1187 extern const struct proto_ops inet6_dgram_ops; 1188 extern const struct proto_ops inet6_sockraw_ops; 1189 1190 struct group_source_req; 1191 struct group_filter; 1192 1193 int ip6_mc_source(int add, int omode, struct sock *sk, 1194 struct group_source_req *pgsr); 1195 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf, 1196 struct sockaddr_storage *list); 1197 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 1198 sockptr_t optval, size_t ss_offset); 1199 1200 #ifdef CONFIG_PROC_FS 1201 int ac6_proc_init(struct net *net); 1202 void ac6_proc_exit(struct net *net); 1203 int raw6_proc_init(void); 1204 void raw6_proc_exit(void); 1205 int tcp6_proc_init(struct net *net); 1206 void tcp6_proc_exit(struct net *net); 1207 int udp6_proc_init(struct net *net); 1208 void udp6_proc_exit(struct net *net); 1209 int ipv6_misc_proc_init(void); 1210 void ipv6_misc_proc_exit(void); 1211 int snmp6_register_dev(struct inet6_dev *idev); 1212 int snmp6_unregister_dev(struct inet6_dev *idev); 1213 1214 #else 1215 static inline int ac6_proc_init(struct net *net) { return 0; } 1216 static inline void ac6_proc_exit(struct net *net) { } 1217 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; } 1218 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; } 1219 #endif 1220 1221 #ifdef CONFIG_SYSCTL 1222 struct ctl_table *ipv6_icmp_sysctl_init(struct net *net); 1223 size_t ipv6_icmp_sysctl_table_size(void); 1224 struct ctl_table *ipv6_route_sysctl_init(struct net *net); 1225 size_t ipv6_route_sysctl_table_size(struct net *net); 1226 int ipv6_sysctl_register(void); 1227 void ipv6_sysctl_unregister(void); 1228 #endif 1229 1230 int ipv6_sock_mc_join(struct sock *sk, int ifindex, 1231 const struct in6_addr *addr); 1232 int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex, 1233 const struct in6_addr *addr, unsigned int mode); 1234 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, 1235 const struct in6_addr *addr); 1236 1237 static inline int ip6_sock_set_v6only(struct sock *sk) 1238 { 1239 int ret = 0; 1240 1241 lock_sock(sk); 1242 if (inet_sk(sk)->inet_num) 1243 ret = -EINVAL; 1244 else 1245 sk->sk_ipv6only = true; 1246 release_sock(sk); 1247 return ret; 1248 } 1249 1250 static inline void ip6_sock_set_recverr(struct sock *sk) 1251 { 1252 inet6_set_bit(RECVERR6, sk); 1253 } 1254 1255 #define IPV6_PREFER_SRC_MASK (IPV6_PREFER_SRC_TMP | IPV6_PREFER_SRC_PUBLIC | \ 1256 IPV6_PREFER_SRC_COA) 1257 1258 static inline int ip6_sock_set_addr_preferences(struct sock *sk, int val) 1259 { 1260 unsigned int prefmask = ~IPV6_PREFER_SRC_MASK; 1261 unsigned int pref = 0; 1262 1263 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */ 1264 switch (val & (IPV6_PREFER_SRC_PUBLIC | 1265 IPV6_PREFER_SRC_TMP | 1266 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) { 1267 case IPV6_PREFER_SRC_PUBLIC: 1268 pref |= IPV6_PREFER_SRC_PUBLIC; 1269 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC | 1270 IPV6_PREFER_SRC_TMP); 1271 break; 1272 case IPV6_PREFER_SRC_TMP: 1273 pref |= IPV6_PREFER_SRC_TMP; 1274 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC | 1275 IPV6_PREFER_SRC_TMP); 1276 break; 1277 case IPV6_PREFER_SRC_PUBTMP_DEFAULT: 1278 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC | 1279 IPV6_PREFER_SRC_TMP); 1280 break; 1281 case 0: 1282 break; 1283 default: 1284 return -EINVAL; 1285 } 1286 1287 /* check HOME/COA conflicts */ 1288 switch (val & (IPV6_PREFER_SRC_HOME | IPV6_PREFER_SRC_COA)) { 1289 case IPV6_PREFER_SRC_HOME: 1290 prefmask &= ~IPV6_PREFER_SRC_COA; 1291 break; 1292 case IPV6_PREFER_SRC_COA: 1293 pref |= IPV6_PREFER_SRC_COA; 1294 break; 1295 case 0: 1296 break; 1297 default: 1298 return -EINVAL; 1299 } 1300 1301 /* check CGA/NONCGA conflicts */ 1302 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) { 1303 case IPV6_PREFER_SRC_CGA: 1304 case IPV6_PREFER_SRC_NONCGA: 1305 case 0: 1306 break; 1307 default: 1308 return -EINVAL; 1309 } 1310 1311 WRITE_ONCE(inet6_sk(sk)->srcprefs, 1312 (READ_ONCE(inet6_sk(sk)->srcprefs) & prefmask) | pref); 1313 return 0; 1314 } 1315 1316 static inline void ip6_sock_set_recvpktinfo(struct sock *sk) 1317 { 1318 lock_sock(sk); 1319 inet6_sk(sk)->rxopt.bits.rxinfo = true; 1320 release_sock(sk); 1321 } 1322 1323 #define IPV6_ADDR_WORDS 4 1324 1325 static inline void ipv6_addr_cpu_to_be32(__be32 *dst, const u32 *src) 1326 { 1327 cpu_to_be32_array(dst, src, IPV6_ADDR_WORDS); 1328 } 1329 1330 static inline void ipv6_addr_be32_to_cpu(u32 *dst, const __be32 *src) 1331 { 1332 be32_to_cpu_array(dst, src, IPV6_ADDR_WORDS); 1333 } 1334 1335 #endif /* _NET_IPV6_H */ 1336