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 struct ip_tunnel_info; 25 26 #define SIN6_LEN_RFC2133 24 27 28 #define IPV6_MAXPLEN 65535 29 30 /* 31 * NextHeader field of IPv6 header 32 */ 33 34 #define NEXTHDR_HOP 0 /* Hop-by-hop option header. */ 35 #define NEXTHDR_IPV4 4 /* IPv4 in IPv6 */ 36 #define NEXTHDR_TCP 6 /* TCP segment. */ 37 #define NEXTHDR_UDP 17 /* UDP message. */ 38 #define NEXTHDR_IPV6 41 /* IPv6 in IPv6 */ 39 #define NEXTHDR_ROUTING 43 /* Routing header. */ 40 #define NEXTHDR_FRAGMENT 44 /* Fragmentation/reassembly header. */ 41 #define NEXTHDR_GRE 47 /* GRE header. */ 42 #define NEXTHDR_ESP 50 /* Encapsulating security payload. */ 43 #define NEXTHDR_AUTH 51 /* Authentication header. */ 44 #define NEXTHDR_ICMP 58 /* ICMP for IPv6. */ 45 #define NEXTHDR_NONE 59 /* No next header */ 46 #define NEXTHDR_DEST 60 /* Destination options header. */ 47 #define NEXTHDR_SCTP 132 /* SCTP message. */ 48 #define NEXTHDR_MOBILITY 135 /* Mobility header. */ 49 50 #define NEXTHDR_MAX 255 51 52 #define IPV6_DEFAULT_HOPLIMIT 64 53 #define IPV6_DEFAULT_MCASTHOPS 1 54 55 /* Limits on Hop-by-Hop and Destination options. 56 * 57 * Per RFC8200 there is no limit on the maximum number or lengths of options in 58 * Hop-by-Hop or Destination options other then the packet must fit in an MTU. 59 * We allow configurable limits in order to mitigate potential denial of 60 * service attacks. 61 * 62 * There are three limits that may be set: 63 * - Limit the number of options in a Hop-by-Hop or Destination options 64 * extension header 65 * - Limit the byte length of a Hop-by-Hop or Destination options extension 66 * header 67 * - Disallow unknown options 68 * 69 * The limits are expressed in corresponding sysctls: 70 * 71 * ipv6.sysctl.max_dst_opts_cnt 72 * ipv6.sysctl.max_hbh_opts_cnt 73 * ipv6.sysctl.max_dst_opts_len 74 * ipv6.sysctl.max_hbh_opts_len 75 * 76 * max_*_opts_cnt is the number of TLVs that are allowed for Destination 77 * options or Hop-by-Hop options. If the number is less than zero then unknown 78 * TLVs are disallowed and the number of known options that are allowed is the 79 * absolute value. Setting the value to INT_MAX indicates no limit. 80 * 81 * max_*_opts_len is the length limit in bytes of a Destination or 82 * Hop-by-Hop options extension header. Setting the value to INT_MAX 83 * indicates no length limit. 84 * 85 * If a limit is exceeded when processing an extension header the packet is 86 * silently discarded. 87 */ 88 89 /* Default limits for Hop-by-Hop and Destination options */ 90 #define IP6_DEFAULT_MAX_DST_OPTS_CNT 8 91 #define IP6_DEFAULT_MAX_HBH_OPTS_CNT 8 92 #define IP6_DEFAULT_MAX_DST_OPTS_LEN INT_MAX /* No limit */ 93 #define IP6_DEFAULT_MAX_HBH_OPTS_LEN INT_MAX /* No limit */ 94 95 /* 96 * Addr type 97 * 98 * type - unicast | multicast 99 * scope - local | site | global 100 * v4 - compat 101 * v4mapped 102 * any 103 * loopback 104 */ 105 106 #define IPV6_ADDR_ANY 0x0000U 107 108 #define IPV6_ADDR_UNICAST 0x0001U 109 #define IPV6_ADDR_MULTICAST 0x0002U 110 111 #define IPV6_ADDR_LOOPBACK 0x0010U 112 #define IPV6_ADDR_LINKLOCAL 0x0020U 113 #define IPV6_ADDR_SITELOCAL 0x0040U 114 115 #define IPV6_ADDR_COMPATv4 0x0080U 116 117 #define IPV6_ADDR_SCOPE_MASK 0x00f0U 118 119 #define IPV6_ADDR_MAPPED 0x1000U 120 121 /* 122 * Addr scopes 123 */ 124 #define IPV6_ADDR_MC_SCOPE(a) \ 125 ((a)->s6_addr[1] & 0x0f) /* nonstandard */ 126 #define __IPV6_ADDR_SCOPE_INVALID -1 127 #define IPV6_ADDR_SCOPE_NODELOCAL 0x01 128 #define IPV6_ADDR_SCOPE_LINKLOCAL 0x02 129 #define IPV6_ADDR_SCOPE_SITELOCAL 0x05 130 #define IPV6_ADDR_SCOPE_ORGLOCAL 0x08 131 #define IPV6_ADDR_SCOPE_GLOBAL 0x0e 132 133 /* 134 * Addr flags 135 */ 136 #define IPV6_ADDR_MC_FLAG_TRANSIENT(a) \ 137 ((a)->s6_addr[1] & 0x10) 138 #define IPV6_ADDR_MC_FLAG_PREFIX(a) \ 139 ((a)->s6_addr[1] & 0x20) 140 #define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \ 141 ((a)->s6_addr[1] & 0x40) 142 143 /* 144 * fragmentation header 145 */ 146 147 struct frag_hdr { 148 __u8 nexthdr; 149 __u8 reserved; 150 __be16 frag_off; 151 __be32 identification; 152 }; 153 154 #define IP6_MF 0x0001 155 #define IP6_OFFSET 0xFFF8 156 157 struct ip6_fraglist_iter { 158 struct ipv6hdr *tmp_hdr; 159 struct sk_buff *frag; 160 int offset; 161 unsigned int hlen; 162 __be32 frag_id; 163 u8 nexthdr; 164 }; 165 166 int ip6_fraglist_init(struct sk_buff *skb, unsigned int hlen, u8 *prevhdr, 167 u8 nexthdr, __be32 frag_id, 168 struct ip6_fraglist_iter *iter); 169 void ip6_fraglist_prepare(struct sk_buff *skb, struct ip6_fraglist_iter *iter); 170 171 static inline struct sk_buff *ip6_fraglist_next(struct ip6_fraglist_iter *iter) 172 { 173 struct sk_buff *skb = iter->frag; 174 175 iter->frag = skb->next; 176 skb_mark_not_on_list(skb); 177 178 return skb; 179 } 180 181 struct ip6_frag_state { 182 u8 *prevhdr; 183 unsigned int hlen; 184 unsigned int mtu; 185 unsigned int left; 186 int offset; 187 int ptr; 188 int hroom; 189 int troom; 190 __be32 frag_id; 191 u8 nexthdr; 192 }; 193 194 void ip6_frag_init(struct sk_buff *skb, unsigned int hlen, unsigned int mtu, 195 unsigned short needed_tailroom, int hdr_room, u8 *prevhdr, 196 u8 nexthdr, __be32 frag_id, struct ip6_frag_state *state); 197 struct sk_buff *ip6_frag_next(struct sk_buff *skb, 198 struct ip6_frag_state *state); 199 200 #define IP6_REPLY_MARK(net, mark) \ 201 ((net)->ipv6.sysctl.fwmark_reflect ? (mark) : 0) 202 203 #include <net/sock.h> 204 205 /* sysctls */ 206 extern int sysctl_mld_max_msf; 207 extern int sysctl_mld_qrv; 208 209 #define _DEVINC(net, statname, mod, idev, field) \ 210 ({ \ 211 struct inet6_dev *_idev = (idev); \ 212 if (likely(_idev != NULL)) \ 213 mod##SNMP_INC_STATS64((_idev)->stats.statname, (field));\ 214 mod##SNMP_INC_STATS64((net)->mib.statname##_statistics, (field));\ 215 }) 216 217 /* per device counters are atomic_long_t */ 218 #define _DEVINCATOMIC(net, statname, mod, idev, field) \ 219 ({ \ 220 struct inet6_dev *_idev = (idev); \ 221 if (likely(_idev != NULL)) \ 222 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \ 223 mod##SNMP_INC_STATS((net)->mib.statname##_statistics, (field));\ 224 }) 225 226 /* per device and per net counters are atomic_long_t */ 227 #define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \ 228 ({ \ 229 struct inet6_dev *_idev = (idev); \ 230 if (likely(_idev != NULL)) \ 231 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \ 232 SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\ 233 }) 234 235 #define _DEVADD(net, statname, mod, idev, field, val) \ 236 ({ \ 237 struct inet6_dev *_idev = (idev); \ 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 if (likely(_idev != NULL)) \ 247 mod##SNMP_UPD_PO_STATS((_idev)->stats.statname, field, (val)); \ 248 mod##SNMP_UPD_PO_STATS((net)->mib.statname##_statistics, field, (val));\ 249 }) 250 251 /* MIBs */ 252 253 #define IP6_INC_STATS(net, idev,field) \ 254 _DEVINC(net, ipv6, , idev, field) 255 #define __IP6_INC_STATS(net, idev,field) \ 256 _DEVINC(net, ipv6, __, idev, field) 257 #define IP6_ADD_STATS(net, idev,field,val) \ 258 _DEVADD(net, ipv6, , idev, field, val) 259 #define __IP6_ADD_STATS(net, idev,field,val) \ 260 _DEVADD(net, ipv6, __, idev, field, val) 261 #define IP6_UPD_PO_STATS(net, idev,field,val) \ 262 _DEVUPD(net, ipv6, , idev, field, val) 263 #define __IP6_UPD_PO_STATS(net, idev,field,val) \ 264 _DEVUPD(net, ipv6, __, idev, field, val) 265 #define ICMP6_INC_STATS(net, idev, field) \ 266 _DEVINCATOMIC(net, icmpv6, , idev, field) 267 #define __ICMP6_INC_STATS(net, idev, field) \ 268 _DEVINCATOMIC(net, icmpv6, __, idev, field) 269 270 #define ICMP6MSGOUT_INC_STATS(net, idev, field) \ 271 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256) 272 #define ICMP6MSGIN_INC_STATS(net, idev, field) \ 273 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field) 274 275 struct ip6_ra_chain { 276 struct ip6_ra_chain *next; 277 struct sock *sk; 278 int sel; 279 void (*destructor)(struct sock *); 280 }; 281 282 extern struct ip6_ra_chain *ip6_ra_chain; 283 extern rwlock_t ip6_ra_lock; 284 285 /* 286 This structure is prepared by protocol, when parsing 287 ancillary data and passed to IPv6. 288 */ 289 290 struct ipv6_txoptions { 291 refcount_t refcnt; 292 /* Length of this structure */ 293 int tot_len; 294 295 /* length of extension headers */ 296 297 __u16 opt_flen; /* after fragment hdr */ 298 __u16 opt_nflen; /* before fragment hdr */ 299 300 struct ipv6_opt_hdr *hopopt; 301 struct ipv6_opt_hdr *dst0opt; 302 struct ipv6_rt_hdr *srcrt; /* Routing Header */ 303 struct ipv6_opt_hdr *dst1opt; 304 struct rcu_head rcu; 305 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */ 306 }; 307 308 /* flowlabel_reflect sysctl values */ 309 enum flowlabel_reflect { 310 FLOWLABEL_REFLECT_ESTABLISHED = 1, 311 FLOWLABEL_REFLECT_TCP_RESET = 2, 312 FLOWLABEL_REFLECT_ICMPV6_ECHO_REPLIES = 4, 313 }; 314 315 struct ip6_flowlabel { 316 struct ip6_flowlabel __rcu *next; 317 __be32 label; 318 atomic_t users; 319 struct in6_addr dst; 320 struct ipv6_txoptions *opt; 321 unsigned long linger; 322 struct rcu_head rcu; 323 u8 share; 324 union { 325 struct pid *pid; 326 kuid_t uid; 327 } owner; 328 unsigned long lastuse; 329 unsigned long expires; 330 struct net *fl_net; 331 }; 332 333 #define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF) 334 #define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF) 335 #define IPV6_FLOWLABEL_STATELESS_FLAG cpu_to_be32(0x00080000) 336 337 #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK) 338 #define IPV6_TCLASS_SHIFT 20 339 340 struct ipv6_fl_socklist { 341 struct ipv6_fl_socklist __rcu *next; 342 struct ip6_flowlabel *fl; 343 struct rcu_head rcu; 344 }; 345 346 struct ipcm6_cookie { 347 struct sockcm_cookie sockc; 348 __s16 hlimit; 349 __s16 tclass; 350 __u16 gso_size; 351 __s8 dontfrag; 352 struct ipv6_txoptions *opt; 353 }; 354 355 static inline void ipcm6_init(struct ipcm6_cookie *ipc6) 356 { 357 *ipc6 = (struct ipcm6_cookie) { 358 .hlimit = -1, 359 .tclass = -1, 360 .dontfrag = -1, 361 }; 362 } 363 364 static inline void ipcm6_init_sk(struct ipcm6_cookie *ipc6, 365 const struct ipv6_pinfo *np) 366 { 367 *ipc6 = (struct ipcm6_cookie) { 368 .hlimit = -1, 369 .tclass = np->tclass, 370 .dontfrag = np->dontfrag, 371 }; 372 } 373 374 static inline struct ipv6_txoptions *txopt_get(const struct ipv6_pinfo *np) 375 { 376 struct ipv6_txoptions *opt; 377 378 rcu_read_lock(); 379 opt = rcu_dereference(np->opt); 380 if (opt) { 381 if (!refcount_inc_not_zero(&opt->refcnt)) 382 opt = NULL; 383 else 384 opt = rcu_pointer_handoff(opt); 385 } 386 rcu_read_unlock(); 387 return opt; 388 } 389 390 static inline void txopt_put(struct ipv6_txoptions *opt) 391 { 392 if (opt && refcount_dec_and_test(&opt->refcnt)) 393 kfree_rcu(opt, rcu); 394 } 395 396 #if IS_ENABLED(CONFIG_IPV6) 397 struct ip6_flowlabel *__fl6_sock_lookup(struct sock *sk, __be32 label); 398 399 extern struct static_key_false_deferred ipv6_flowlabel_exclusive; 400 static inline struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, 401 __be32 label) 402 { 403 if (static_branch_unlikely(&ipv6_flowlabel_exclusive.key) && 404 READ_ONCE(sock_net(sk)->ipv6.flowlabel_has_excl)) 405 return __fl6_sock_lookup(sk, label) ? : ERR_PTR(-ENOENT); 406 407 return NULL; 408 } 409 #endif 410 411 struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space, 412 struct ip6_flowlabel *fl, 413 struct ipv6_txoptions *fopt); 414 void fl6_free_socklist(struct sock *sk); 415 int ipv6_flowlabel_opt(struct sock *sk, sockptr_t optval, int optlen); 416 int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq, 417 int flags); 418 int ip6_flowlabel_init(void); 419 void ip6_flowlabel_cleanup(void); 420 bool ip6_autoflowlabel(struct net *net, const struct ipv6_pinfo *np); 421 422 static inline void fl6_sock_release(struct ip6_flowlabel *fl) 423 { 424 if (fl) 425 atomic_dec(&fl->users); 426 } 427 428 void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info); 429 430 void icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, 431 struct icmp6hdr *thdr, int len); 432 433 int ip6_ra_control(struct sock *sk, int sel); 434 435 int ipv6_parse_hopopts(struct sk_buff *skb); 436 437 struct ipv6_txoptions *ipv6_dup_options(struct sock *sk, 438 struct ipv6_txoptions *opt); 439 struct ipv6_txoptions *ipv6_renew_options(struct sock *sk, 440 struct ipv6_txoptions *opt, 441 int newtype, 442 struct ipv6_opt_hdr *newopt); 443 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space, 444 struct ipv6_txoptions *opt); 445 446 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb, 447 const struct inet6_skb_parm *opt); 448 struct ipv6_txoptions *ipv6_update_options(struct sock *sk, 449 struct ipv6_txoptions *opt); 450 451 static inline bool ipv6_accept_ra(struct inet6_dev *idev) 452 { 453 /* If forwarding is enabled, RA are not accepted unless the special 454 * hybrid mode (accept_ra=2) is enabled. 455 */ 456 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 : 457 idev->cnf.accept_ra; 458 } 459 460 #define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */ 461 #define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */ 462 #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */ 463 464 int __ipv6_addr_type(const struct in6_addr *addr); 465 static inline int ipv6_addr_type(const struct in6_addr *addr) 466 { 467 return __ipv6_addr_type(addr) & 0xffff; 468 } 469 470 static inline int ipv6_addr_scope(const struct in6_addr *addr) 471 { 472 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK; 473 } 474 475 static inline int __ipv6_addr_src_scope(int type) 476 { 477 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16); 478 } 479 480 static inline int ipv6_addr_src_scope(const struct in6_addr *addr) 481 { 482 return __ipv6_addr_src_scope(__ipv6_addr_type(addr)); 483 } 484 485 static inline bool __ipv6_addr_needs_scope_id(int type) 486 { 487 return type & IPV6_ADDR_LINKLOCAL || 488 (type & IPV6_ADDR_MULTICAST && 489 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL))); 490 } 491 492 static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface) 493 { 494 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0; 495 } 496 497 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2) 498 { 499 return memcmp(a1, a2, sizeof(struct in6_addr)); 500 } 501 502 static inline bool 503 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m, 504 const struct in6_addr *a2) 505 { 506 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 507 const unsigned long *ul1 = (const unsigned long *)a1; 508 const unsigned long *ulm = (const unsigned long *)m; 509 const unsigned long *ul2 = (const unsigned long *)a2; 510 511 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) | 512 ((ul1[1] ^ ul2[1]) & ulm[1])); 513 #else 514 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) | 515 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) | 516 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) | 517 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3])); 518 #endif 519 } 520 521 static inline void ipv6_addr_prefix(struct in6_addr *pfx, 522 const struct in6_addr *addr, 523 int plen) 524 { 525 /* caller must guarantee 0 <= plen <= 128 */ 526 int o = plen >> 3, 527 b = plen & 0x7; 528 529 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr)); 530 memcpy(pfx->s6_addr, addr, o); 531 if (b != 0) 532 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b); 533 } 534 535 static inline void ipv6_addr_prefix_copy(struct in6_addr *addr, 536 const struct in6_addr *pfx, 537 int plen) 538 { 539 /* caller must guarantee 0 <= plen <= 128 */ 540 int o = plen >> 3, 541 b = plen & 0x7; 542 543 memcpy(addr->s6_addr, pfx, o); 544 if (b != 0) { 545 addr->s6_addr[o] &= ~(0xff00 >> b); 546 addr->s6_addr[o] |= (pfx->s6_addr[o] & (0xff00 >> b)); 547 } 548 } 549 550 static inline void __ipv6_addr_set_half(__be32 *addr, 551 __be32 wh, __be32 wl) 552 { 553 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 554 #if defined(__BIG_ENDIAN) 555 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) { 556 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl)); 557 return; 558 } 559 #elif defined(__LITTLE_ENDIAN) 560 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) { 561 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh)); 562 return; 563 } 564 #endif 565 #endif 566 addr[0] = wh; 567 addr[1] = wl; 568 } 569 570 static inline void ipv6_addr_set(struct in6_addr *addr, 571 __be32 w1, __be32 w2, 572 __be32 w3, __be32 w4) 573 { 574 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2); 575 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4); 576 } 577 578 static inline bool ipv6_addr_equal(const struct in6_addr *a1, 579 const struct in6_addr *a2) 580 { 581 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 582 const unsigned long *ul1 = (const unsigned long *)a1; 583 const unsigned long *ul2 = (const unsigned long *)a2; 584 585 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL; 586 #else 587 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) | 588 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) | 589 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) | 590 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0; 591 #endif 592 } 593 594 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 595 static inline bool __ipv6_prefix_equal64_half(const __be64 *a1, 596 const __be64 *a2, 597 unsigned int len) 598 { 599 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len)))) 600 return false; 601 return true; 602 } 603 604 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1, 605 const struct in6_addr *addr2, 606 unsigned int prefixlen) 607 { 608 const __be64 *a1 = (const __be64 *)addr1; 609 const __be64 *a2 = (const __be64 *)addr2; 610 611 if (prefixlen >= 64) { 612 if (a1[0] ^ a2[0]) 613 return false; 614 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64); 615 } 616 return __ipv6_prefix_equal64_half(a1, a2, prefixlen); 617 } 618 #else 619 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1, 620 const struct in6_addr *addr2, 621 unsigned int prefixlen) 622 { 623 const __be32 *a1 = addr1->s6_addr32; 624 const __be32 *a2 = addr2->s6_addr32; 625 unsigned int pdw, pbi; 626 627 /* check complete u32 in prefix */ 628 pdw = prefixlen >> 5; 629 if (pdw && memcmp(a1, a2, pdw << 2)) 630 return false; 631 632 /* check incomplete u32 in prefix */ 633 pbi = prefixlen & 0x1f; 634 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi)))) 635 return false; 636 637 return true; 638 } 639 #endif 640 641 static inline bool ipv6_addr_any(const struct in6_addr *a) 642 { 643 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 644 const unsigned long *ul = (const unsigned long *)a; 645 646 return (ul[0] | ul[1]) == 0UL; 647 #else 648 return (a->s6_addr32[0] | a->s6_addr32[1] | 649 a->s6_addr32[2] | a->s6_addr32[3]) == 0; 650 #endif 651 } 652 653 static inline u32 ipv6_addr_hash(const struct in6_addr *a) 654 { 655 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 656 const unsigned long *ul = (const unsigned long *)a; 657 unsigned long x = ul[0] ^ ul[1]; 658 659 return (u32)(x ^ (x >> 32)); 660 #else 661 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^ 662 a->s6_addr32[2] ^ a->s6_addr32[3]); 663 #endif 664 } 665 666 /* more secured version of ipv6_addr_hash() */ 667 static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval) 668 { 669 u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1]; 670 671 return jhash_3words(v, 672 (__force u32)a->s6_addr32[2], 673 (__force u32)a->s6_addr32[3], 674 initval); 675 } 676 677 static inline bool ipv6_addr_loopback(const struct in6_addr *a) 678 { 679 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 680 const __be64 *be = (const __be64 *)a; 681 682 return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL; 683 #else 684 return (a->s6_addr32[0] | a->s6_addr32[1] | 685 a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0; 686 #endif 687 } 688 689 /* 690 * Note that we must __force cast these to unsigned long to make sparse happy, 691 * since all of the endian-annotated types are fixed size regardless of arch. 692 */ 693 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a) 694 { 695 return ( 696 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 697 *(unsigned long *)a | 698 #else 699 (__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) | 700 #endif 701 (__force unsigned long)(a->s6_addr32[2] ^ 702 cpu_to_be32(0x0000ffff))) == 0UL; 703 } 704 705 static inline bool ipv6_addr_v4mapped_loopback(const struct in6_addr *a) 706 { 707 return ipv6_addr_v4mapped(a) && ipv4_is_loopback(a->s6_addr32[3]); 708 } 709 710 static inline u32 ipv6_portaddr_hash(const struct net *net, 711 const struct in6_addr *addr6, 712 unsigned int port) 713 { 714 unsigned int hash, mix = net_hash_mix(net); 715 716 if (ipv6_addr_any(addr6)) 717 hash = jhash_1word(0, mix); 718 else if (ipv6_addr_v4mapped(addr6)) 719 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix); 720 else 721 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix); 722 723 return hash ^ port; 724 } 725 726 /* 727 * Check for a RFC 4843 ORCHID address 728 * (Overlay Routable Cryptographic Hash Identifiers) 729 */ 730 static inline bool ipv6_addr_orchid(const struct in6_addr *a) 731 { 732 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010); 733 } 734 735 static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr) 736 { 737 return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000); 738 } 739 740 static inline void ipv6_addr_set_v4mapped(const __be32 addr, 741 struct in6_addr *v4mapped) 742 { 743 ipv6_addr_set(v4mapped, 744 0, 0, 745 htonl(0x0000FFFF), 746 addr); 747 } 748 749 /* 750 * find the first different bit between two addresses 751 * length of address must be a multiple of 32bits 752 */ 753 static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen) 754 { 755 const __be32 *a1 = token1, *a2 = token2; 756 int i; 757 758 addrlen >>= 2; 759 760 for (i = 0; i < addrlen; i++) { 761 __be32 xb = a1[i] ^ a2[i]; 762 if (xb) 763 return i * 32 + 31 - __fls(ntohl(xb)); 764 } 765 766 /* 767 * we should *never* get to this point since that 768 * would mean the addrs are equal 769 * 770 * However, we do get to it 8) And exacly, when 771 * addresses are equal 8) 772 * 773 * ip route add 1111::/128 via ... 774 * ip route add 1111::/64 via ... 775 * and we are here. 776 * 777 * Ideally, this function should stop comparison 778 * at prefix length. It does not, but it is still OK, 779 * if returned value is greater than prefix length. 780 * --ANK (980803) 781 */ 782 return addrlen << 5; 783 } 784 785 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 786 static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen) 787 { 788 const __be64 *a1 = token1, *a2 = token2; 789 int i; 790 791 addrlen >>= 3; 792 793 for (i = 0; i < addrlen; i++) { 794 __be64 xb = a1[i] ^ a2[i]; 795 if (xb) 796 return i * 64 + 63 - __fls(be64_to_cpu(xb)); 797 } 798 799 return addrlen << 6; 800 } 801 #endif 802 803 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen) 804 { 805 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 806 if (__builtin_constant_p(addrlen) && !(addrlen & 7)) 807 return __ipv6_addr_diff64(token1, token2, addrlen); 808 #endif 809 return __ipv6_addr_diff32(token1, token2, addrlen); 810 } 811 812 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2) 813 { 814 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr)); 815 } 816 817 __be32 ipv6_select_ident(struct net *net, 818 const struct in6_addr *daddr, 819 const struct in6_addr *saddr); 820 __be32 ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb); 821 822 int ip6_dst_hoplimit(struct dst_entry *dst); 823 824 static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6, 825 struct dst_entry *dst) 826 { 827 int hlimit; 828 829 if (ipv6_addr_is_multicast(&fl6->daddr)) 830 hlimit = np->mcast_hops; 831 else 832 hlimit = np->hop_limit; 833 if (hlimit < 0) 834 hlimit = ip6_dst_hoplimit(dst); 835 return hlimit; 836 } 837 838 /* copy IPv6 saddr & daddr to flow_keys, possibly using 64bit load/store 839 * Equivalent to : flow->v6addrs.src = iph->saddr; 840 * flow->v6addrs.dst = iph->daddr; 841 */ 842 static inline void iph_to_flow_copy_v6addrs(struct flow_keys *flow, 843 const struct ipv6hdr *iph) 844 { 845 BUILD_BUG_ON(offsetof(typeof(flow->addrs), v6addrs.dst) != 846 offsetof(typeof(flow->addrs), v6addrs.src) + 847 sizeof(flow->addrs.v6addrs.src)); 848 memcpy(&flow->addrs.v6addrs, &iph->saddr, sizeof(flow->addrs.v6addrs)); 849 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; 850 } 851 852 #if IS_ENABLED(CONFIG_IPV6) 853 854 static inline bool ipv6_can_nonlocal_bind(struct net *net, 855 struct inet_sock *inet) 856 { 857 return net->ipv6.sysctl.ip_nonlocal_bind || 858 inet->freebind || inet->transparent; 859 } 860 861 /* Sysctl settings for net ipv6.auto_flowlabels */ 862 #define IP6_AUTO_FLOW_LABEL_OFF 0 863 #define IP6_AUTO_FLOW_LABEL_OPTOUT 1 864 #define IP6_AUTO_FLOW_LABEL_OPTIN 2 865 #define IP6_AUTO_FLOW_LABEL_FORCED 3 866 867 #define IP6_AUTO_FLOW_LABEL_MAX IP6_AUTO_FLOW_LABEL_FORCED 868 869 #define IP6_DEFAULT_AUTO_FLOW_LABELS IP6_AUTO_FLOW_LABEL_OPTOUT 870 871 static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb, 872 __be32 flowlabel, bool autolabel, 873 struct flowi6 *fl6) 874 { 875 u32 hash; 876 877 /* @flowlabel may include more than a flow label, eg, the traffic class. 878 * Here we want only the flow label value. 879 */ 880 flowlabel &= IPV6_FLOWLABEL_MASK; 881 882 if (flowlabel || 883 net->ipv6.sysctl.auto_flowlabels == IP6_AUTO_FLOW_LABEL_OFF || 884 (!autolabel && 885 net->ipv6.sysctl.auto_flowlabels != IP6_AUTO_FLOW_LABEL_FORCED)) 886 return flowlabel; 887 888 hash = skb_get_hash_flowi6(skb, fl6); 889 890 /* Since this is being sent on the wire obfuscate hash a bit 891 * to minimize possbility that any useful information to an 892 * attacker is leaked. Only lower 20 bits are relevant. 893 */ 894 hash = rol32(hash, 16); 895 896 flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK; 897 898 if (net->ipv6.sysctl.flowlabel_state_ranges) 899 flowlabel |= IPV6_FLOWLABEL_STATELESS_FLAG; 900 901 return flowlabel; 902 } 903 904 static inline int ip6_default_np_autolabel(struct net *net) 905 { 906 switch (net->ipv6.sysctl.auto_flowlabels) { 907 case IP6_AUTO_FLOW_LABEL_OFF: 908 case IP6_AUTO_FLOW_LABEL_OPTIN: 909 default: 910 return 0; 911 case IP6_AUTO_FLOW_LABEL_OPTOUT: 912 case IP6_AUTO_FLOW_LABEL_FORCED: 913 return 1; 914 } 915 } 916 #else 917 static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb, 918 __be32 flowlabel, bool autolabel, 919 struct flowi6 *fl6) 920 { 921 return flowlabel; 922 } 923 static inline int ip6_default_np_autolabel(struct net *net) 924 { 925 return 0; 926 } 927 #endif 928 929 #if IS_ENABLED(CONFIG_IPV6) 930 static inline int ip6_multipath_hash_policy(const struct net *net) 931 { 932 return net->ipv6.sysctl.multipath_hash_policy; 933 } 934 static inline u32 ip6_multipath_hash_fields(const struct net *net) 935 { 936 return net->ipv6.sysctl.multipath_hash_fields; 937 } 938 #else 939 static inline int ip6_multipath_hash_policy(const struct net *net) 940 { 941 return 0; 942 } 943 static inline u32 ip6_multipath_hash_fields(const struct net *net) 944 { 945 return 0; 946 } 947 #endif 948 949 /* 950 * Header manipulation 951 */ 952 static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass, 953 __be32 flowlabel) 954 { 955 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel; 956 } 957 958 static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr) 959 { 960 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK; 961 } 962 963 static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr) 964 { 965 return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK; 966 } 967 968 static inline u8 ip6_tclass(__be32 flowinfo) 969 { 970 return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT; 971 } 972 973 static inline __be32 ip6_make_flowinfo(unsigned int tclass, __be32 flowlabel) 974 { 975 return htonl(tclass << IPV6_TCLASS_SHIFT) | flowlabel; 976 } 977 978 static inline __be32 flowi6_get_flowlabel(const struct flowi6 *fl6) 979 { 980 return fl6->flowlabel & IPV6_FLOWLABEL_MASK; 981 } 982 983 /* 984 * Prototypes exported by ipv6 985 */ 986 987 /* 988 * rcv function (called from netdevice level) 989 */ 990 991 int ipv6_rcv(struct sk_buff *skb, struct net_device *dev, 992 struct packet_type *pt, struct net_device *orig_dev); 993 void ipv6_list_rcv(struct list_head *head, struct packet_type *pt, 994 struct net_device *orig_dev); 995 996 int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 997 998 /* 999 * upper-layer output functions 1000 */ 1001 int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6, 1002 __u32 mark, struct ipv6_txoptions *opt, int tclass, u32 priority); 1003 1004 int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr); 1005 1006 int ip6_append_data(struct sock *sk, 1007 int getfrag(void *from, char *to, int offset, int len, 1008 int odd, struct sk_buff *skb), 1009 void *from, int length, int transhdrlen, 1010 struct ipcm6_cookie *ipc6, struct flowi6 *fl6, 1011 struct rt6_info *rt, unsigned int flags); 1012 1013 int ip6_push_pending_frames(struct sock *sk); 1014 1015 void ip6_flush_pending_frames(struct sock *sk); 1016 1017 int ip6_send_skb(struct sk_buff *skb); 1018 1019 struct sk_buff *__ip6_make_skb(struct sock *sk, struct sk_buff_head *queue, 1020 struct inet_cork_full *cork, 1021 struct inet6_cork *v6_cork); 1022 struct sk_buff *ip6_make_skb(struct sock *sk, 1023 int getfrag(void *from, char *to, int offset, 1024 int len, int odd, struct sk_buff *skb), 1025 void *from, int length, int transhdrlen, 1026 struct ipcm6_cookie *ipc6, struct flowi6 *fl6, 1027 struct rt6_info *rt, unsigned int flags, 1028 struct inet_cork_full *cork); 1029 1030 static inline struct sk_buff *ip6_finish_skb(struct sock *sk) 1031 { 1032 return __ip6_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork, 1033 &inet6_sk(sk)->cork); 1034 } 1035 1036 int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst, 1037 struct flowi6 *fl6); 1038 struct dst_entry *ip6_dst_lookup_flow(struct net *net, const struct sock *sk, struct flowi6 *fl6, 1039 const struct in6_addr *final_dst); 1040 struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6, 1041 const struct in6_addr *final_dst, 1042 bool connected); 1043 struct dst_entry *ip6_dst_lookup_tunnel(struct sk_buff *skb, 1044 struct net_device *dev, 1045 struct net *net, struct socket *sock, 1046 struct in6_addr *saddr, 1047 const struct ip_tunnel_info *info, 1048 u8 protocol, bool use_cache); 1049 struct dst_entry *ip6_blackhole_route(struct net *net, 1050 struct dst_entry *orig_dst); 1051 1052 /* 1053 * skb processing functions 1054 */ 1055 1056 int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb); 1057 int ip6_forward(struct sk_buff *skb); 1058 int ip6_input(struct sk_buff *skb); 1059 int ip6_mc_input(struct sk_buff *skb); 1060 void ip6_protocol_deliver_rcu(struct net *net, struct sk_buff *skb, int nexthdr, 1061 bool have_final); 1062 1063 int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); 1064 int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); 1065 1066 /* 1067 * Extension header (options) processing 1068 */ 1069 1070 void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, 1071 u8 *proto, struct in6_addr **daddr_p, 1072 struct in6_addr *saddr); 1073 void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, 1074 u8 *proto); 1075 1076 int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp, 1077 __be16 *frag_offp); 1078 1079 bool ipv6_ext_hdr(u8 nexthdr); 1080 1081 enum { 1082 IP6_FH_F_FRAG = (1 << 0), 1083 IP6_FH_F_AUTH = (1 << 1), 1084 IP6_FH_F_SKIP_RH = (1 << 2), 1085 }; 1086 1087 /* find specified header and get offset to it */ 1088 int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target, 1089 unsigned short *fragoff, int *fragflg); 1090 1091 int ipv6_find_tlv(const struct sk_buff *skb, int offset, int type); 1092 1093 struct in6_addr *fl6_update_dst(struct flowi6 *fl6, 1094 const struct ipv6_txoptions *opt, 1095 struct in6_addr *orig); 1096 1097 /* 1098 * socket options (ipv6_sockglue.c) 1099 */ 1100 DECLARE_STATIC_KEY_FALSE(ip6_min_hopcount); 1101 1102 int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, 1103 unsigned int optlen); 1104 int ipv6_getsockopt(struct sock *sk, int level, int optname, 1105 char __user *optval, int __user *optlen); 1106 1107 int __ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, 1108 int addr_len); 1109 int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len); 1110 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr, 1111 int addr_len); 1112 int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr); 1113 void ip6_datagram_release_cb(struct sock *sk); 1114 1115 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, 1116 int *addr_len); 1117 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len, 1118 int *addr_len); 1119 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, 1120 u32 info, u8 *payload); 1121 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info); 1122 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu); 1123 1124 int inet6_release(struct socket *sock); 1125 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len); 1126 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 1127 int peer); 1128 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg); 1129 int inet6_compat_ioctl(struct socket *sock, unsigned int cmd, 1130 unsigned long arg); 1131 1132 int inet6_hash_connect(struct inet_timewait_death_row *death_row, 1133 struct sock *sk); 1134 int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size); 1135 int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 1136 int flags); 1137 1138 /* 1139 * reassembly.c 1140 */ 1141 extern const struct proto_ops inet6_stream_ops; 1142 extern const struct proto_ops inet6_dgram_ops; 1143 extern const struct proto_ops inet6_sockraw_ops; 1144 1145 struct group_source_req; 1146 struct group_filter; 1147 1148 int ip6_mc_source(int add, int omode, struct sock *sk, 1149 struct group_source_req *pgsr); 1150 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf, 1151 struct sockaddr_storage *list); 1152 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 1153 struct sockaddr_storage __user *p); 1154 1155 #ifdef CONFIG_PROC_FS 1156 int ac6_proc_init(struct net *net); 1157 void ac6_proc_exit(struct net *net); 1158 int raw6_proc_init(void); 1159 void raw6_proc_exit(void); 1160 int tcp6_proc_init(struct net *net); 1161 void tcp6_proc_exit(struct net *net); 1162 int udp6_proc_init(struct net *net); 1163 void udp6_proc_exit(struct net *net); 1164 int udplite6_proc_init(void); 1165 void udplite6_proc_exit(void); 1166 int ipv6_misc_proc_init(void); 1167 void ipv6_misc_proc_exit(void); 1168 int snmp6_register_dev(struct inet6_dev *idev); 1169 int snmp6_unregister_dev(struct inet6_dev *idev); 1170 1171 #else 1172 static inline int ac6_proc_init(struct net *net) { return 0; } 1173 static inline void ac6_proc_exit(struct net *net) { } 1174 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; } 1175 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; } 1176 #endif 1177 1178 #ifdef CONFIG_SYSCTL 1179 struct ctl_table *ipv6_icmp_sysctl_init(struct net *net); 1180 struct ctl_table *ipv6_route_sysctl_init(struct net *net); 1181 int ipv6_sysctl_register(void); 1182 void ipv6_sysctl_unregister(void); 1183 #endif 1184 1185 int ipv6_sock_mc_join(struct sock *sk, int ifindex, 1186 const struct in6_addr *addr); 1187 int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex, 1188 const struct in6_addr *addr, unsigned int mode); 1189 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, 1190 const struct in6_addr *addr); 1191 1192 static inline int ip6_sock_set_v6only(struct sock *sk) 1193 { 1194 if (inet_sk(sk)->inet_num) 1195 return -EINVAL; 1196 lock_sock(sk); 1197 sk->sk_ipv6only = true; 1198 release_sock(sk); 1199 return 0; 1200 } 1201 1202 static inline void ip6_sock_set_recverr(struct sock *sk) 1203 { 1204 lock_sock(sk); 1205 inet6_sk(sk)->recverr = true; 1206 release_sock(sk); 1207 } 1208 1209 static inline int __ip6_sock_set_addr_preferences(struct sock *sk, int val) 1210 { 1211 unsigned int pref = 0; 1212 unsigned int prefmask = ~0; 1213 1214 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */ 1215 switch (val & (IPV6_PREFER_SRC_PUBLIC | 1216 IPV6_PREFER_SRC_TMP | 1217 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) { 1218 case IPV6_PREFER_SRC_PUBLIC: 1219 pref |= IPV6_PREFER_SRC_PUBLIC; 1220 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC | 1221 IPV6_PREFER_SRC_TMP); 1222 break; 1223 case IPV6_PREFER_SRC_TMP: 1224 pref |= IPV6_PREFER_SRC_TMP; 1225 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC | 1226 IPV6_PREFER_SRC_TMP); 1227 break; 1228 case IPV6_PREFER_SRC_PUBTMP_DEFAULT: 1229 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC | 1230 IPV6_PREFER_SRC_TMP); 1231 break; 1232 case 0: 1233 break; 1234 default: 1235 return -EINVAL; 1236 } 1237 1238 /* check HOME/COA conflicts */ 1239 switch (val & (IPV6_PREFER_SRC_HOME | IPV6_PREFER_SRC_COA)) { 1240 case IPV6_PREFER_SRC_HOME: 1241 prefmask &= ~IPV6_PREFER_SRC_COA; 1242 break; 1243 case IPV6_PREFER_SRC_COA: 1244 pref |= IPV6_PREFER_SRC_COA; 1245 break; 1246 case 0: 1247 break; 1248 default: 1249 return -EINVAL; 1250 } 1251 1252 /* check CGA/NONCGA conflicts */ 1253 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) { 1254 case IPV6_PREFER_SRC_CGA: 1255 case IPV6_PREFER_SRC_NONCGA: 1256 case 0: 1257 break; 1258 default: 1259 return -EINVAL; 1260 } 1261 1262 inet6_sk(sk)->srcprefs = (inet6_sk(sk)->srcprefs & prefmask) | pref; 1263 return 0; 1264 } 1265 1266 static inline int ip6_sock_set_addr_preferences(struct sock *sk, bool val) 1267 { 1268 int ret; 1269 1270 lock_sock(sk); 1271 ret = __ip6_sock_set_addr_preferences(sk, val); 1272 release_sock(sk); 1273 return ret; 1274 } 1275 1276 static inline void ip6_sock_set_recvpktinfo(struct sock *sk) 1277 { 1278 lock_sock(sk); 1279 inet6_sk(sk)->rxopt.bits.rxinfo = true; 1280 release_sock(sk); 1281 } 1282 1283 #endif /* _NET_IPV6_H */ 1284