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 #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 /* 155 * Jumbo payload option, as described in RFC 2675 2. 156 */ 157 struct hop_jumbo_hdr { 158 u8 nexthdr; 159 u8 hdrlen; 160 u8 tlv_type; /* IPV6_TLV_JUMBO, 0xC2 */ 161 u8 tlv_len; /* 4 */ 162 __be32 jumbo_payload_len; 163 }; 164 165 #define IP6_MF 0x0001 166 #define IP6_OFFSET 0xFFF8 167 168 struct ip6_fraglist_iter { 169 struct ipv6hdr *tmp_hdr; 170 struct sk_buff *frag; 171 int offset; 172 unsigned int hlen; 173 __be32 frag_id; 174 u8 nexthdr; 175 }; 176 177 int ip6_fraglist_init(struct sk_buff *skb, unsigned int hlen, u8 *prevhdr, 178 u8 nexthdr, __be32 frag_id, 179 struct ip6_fraglist_iter *iter); 180 void ip6_fraglist_prepare(struct sk_buff *skb, struct ip6_fraglist_iter *iter); 181 182 static inline struct sk_buff *ip6_fraglist_next(struct ip6_fraglist_iter *iter) 183 { 184 struct sk_buff *skb = iter->frag; 185 186 iter->frag = skb->next; 187 skb_mark_not_on_list(skb); 188 189 return skb; 190 } 191 192 struct ip6_frag_state { 193 u8 *prevhdr; 194 unsigned int hlen; 195 unsigned int mtu; 196 unsigned int left; 197 int offset; 198 int ptr; 199 int hroom; 200 int troom; 201 __be32 frag_id; 202 u8 nexthdr; 203 }; 204 205 void ip6_frag_init(struct sk_buff *skb, unsigned int hlen, unsigned int mtu, 206 unsigned short needed_tailroom, int hdr_room, u8 *prevhdr, 207 u8 nexthdr, __be32 frag_id, struct ip6_frag_state *state); 208 struct sk_buff *ip6_frag_next(struct sk_buff *skb, 209 struct ip6_frag_state *state); 210 211 #define IP6_REPLY_MARK(net, mark) \ 212 ((net)->ipv6.sysctl.fwmark_reflect ? (mark) : 0) 213 214 #include <net/sock.h> 215 216 /* sysctls */ 217 extern int sysctl_mld_max_msf; 218 extern int sysctl_mld_qrv; 219 220 #define _DEVINC(net, statname, mod, idev, field) \ 221 ({ \ 222 struct inet6_dev *_idev = (idev); \ 223 if (likely(_idev != NULL)) \ 224 mod##SNMP_INC_STATS64((_idev)->stats.statname, (field));\ 225 mod##SNMP_INC_STATS64((net)->mib.statname##_statistics, (field));\ 226 }) 227 228 /* per device counters are atomic_long_t */ 229 #define _DEVINCATOMIC(net, statname, mod, idev, field) \ 230 ({ \ 231 struct inet6_dev *_idev = (idev); \ 232 if (likely(_idev != NULL)) \ 233 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \ 234 mod##SNMP_INC_STATS((net)->mib.statname##_statistics, (field));\ 235 }) 236 237 /* per device and per net counters are atomic_long_t */ 238 #define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \ 239 ({ \ 240 struct inet6_dev *_idev = (idev); \ 241 if (likely(_idev != NULL)) \ 242 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \ 243 SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\ 244 }) 245 246 #define _DEVADD(net, statname, mod, idev, field, val) \ 247 ({ \ 248 struct inet6_dev *_idev = (idev); \ 249 if (likely(_idev != NULL)) \ 250 mod##SNMP_ADD_STATS((_idev)->stats.statname, (field), (val)); \ 251 mod##SNMP_ADD_STATS((net)->mib.statname##_statistics, (field), (val));\ 252 }) 253 254 #define _DEVUPD(net, statname, mod, idev, field, val) \ 255 ({ \ 256 struct inet6_dev *_idev = (idev); \ 257 if (likely(_idev != NULL)) \ 258 mod##SNMP_UPD_PO_STATS((_idev)->stats.statname, field, (val)); \ 259 mod##SNMP_UPD_PO_STATS((net)->mib.statname##_statistics, field, (val));\ 260 }) 261 262 /* MIBs */ 263 264 #define IP6_INC_STATS(net, idev,field) \ 265 _DEVINC(net, ipv6, , idev, field) 266 #define __IP6_INC_STATS(net, idev,field) \ 267 _DEVINC(net, ipv6, __, idev, field) 268 #define IP6_ADD_STATS(net, idev,field,val) \ 269 _DEVADD(net, ipv6, , idev, field, val) 270 #define __IP6_ADD_STATS(net, idev,field,val) \ 271 _DEVADD(net, ipv6, __, idev, field, val) 272 #define IP6_UPD_PO_STATS(net, idev,field,val) \ 273 _DEVUPD(net, ipv6, , idev, field, val) 274 #define __IP6_UPD_PO_STATS(net, idev,field,val) \ 275 _DEVUPD(net, ipv6, __, idev, field, val) 276 #define ICMP6_INC_STATS(net, idev, field) \ 277 _DEVINCATOMIC(net, icmpv6, , idev, field) 278 #define __ICMP6_INC_STATS(net, idev, field) \ 279 _DEVINCATOMIC(net, icmpv6, __, idev, field) 280 281 #define ICMP6MSGOUT_INC_STATS(net, idev, field) \ 282 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256) 283 #define ICMP6MSGIN_INC_STATS(net, idev, field) \ 284 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field) 285 286 struct ip6_ra_chain { 287 struct ip6_ra_chain *next; 288 struct sock *sk; 289 int sel; 290 void (*destructor)(struct sock *); 291 }; 292 293 extern struct ip6_ra_chain *ip6_ra_chain; 294 extern rwlock_t ip6_ra_lock; 295 296 /* 297 This structure is prepared by protocol, when parsing 298 ancillary data and passed to IPv6. 299 */ 300 301 struct ipv6_txoptions { 302 refcount_t refcnt; 303 /* Length of this structure */ 304 int tot_len; 305 306 /* length of extension headers */ 307 308 __u16 opt_flen; /* after fragment hdr */ 309 __u16 opt_nflen; /* before fragment hdr */ 310 311 struct ipv6_opt_hdr *hopopt; 312 struct ipv6_opt_hdr *dst0opt; 313 struct ipv6_rt_hdr *srcrt; /* Routing Header */ 314 struct ipv6_opt_hdr *dst1opt; 315 struct rcu_head rcu; 316 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */ 317 }; 318 319 /* flowlabel_reflect sysctl values */ 320 enum flowlabel_reflect { 321 FLOWLABEL_REFLECT_ESTABLISHED = 1, 322 FLOWLABEL_REFLECT_TCP_RESET = 2, 323 FLOWLABEL_REFLECT_ICMPV6_ECHO_REPLIES = 4, 324 }; 325 326 struct ip6_flowlabel { 327 struct ip6_flowlabel __rcu *next; 328 __be32 label; 329 atomic_t users; 330 struct in6_addr dst; 331 struct ipv6_txoptions *opt; 332 unsigned long linger; 333 struct rcu_head rcu; 334 u8 share; 335 union { 336 struct pid *pid; 337 kuid_t uid; 338 } owner; 339 unsigned long lastuse; 340 unsigned long expires; 341 struct net *fl_net; 342 }; 343 344 #define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF) 345 #define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF) 346 #define IPV6_FLOWLABEL_STATELESS_FLAG cpu_to_be32(0x00080000) 347 348 #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK) 349 #define IPV6_TCLASS_SHIFT 20 350 351 struct ipv6_fl_socklist { 352 struct ipv6_fl_socklist __rcu *next; 353 struct ip6_flowlabel *fl; 354 struct rcu_head rcu; 355 }; 356 357 struct ipcm6_cookie { 358 struct sockcm_cookie sockc; 359 __s16 hlimit; 360 __s16 tclass; 361 __u16 gso_size; 362 __s8 dontfrag; 363 struct ipv6_txoptions *opt; 364 }; 365 366 static inline void ipcm6_init(struct ipcm6_cookie *ipc6) 367 { 368 *ipc6 = (struct ipcm6_cookie) { 369 .hlimit = -1, 370 .tclass = -1, 371 .dontfrag = -1, 372 }; 373 } 374 375 static inline void ipcm6_init_sk(struct ipcm6_cookie *ipc6, 376 const struct ipv6_pinfo *np) 377 { 378 *ipc6 = (struct ipcm6_cookie) { 379 .hlimit = -1, 380 .tclass = np->tclass, 381 .dontfrag = np->dontfrag, 382 }; 383 } 384 385 static inline struct ipv6_txoptions *txopt_get(const struct ipv6_pinfo *np) 386 { 387 struct ipv6_txoptions *opt; 388 389 rcu_read_lock(); 390 opt = rcu_dereference(np->opt); 391 if (opt) { 392 if (!refcount_inc_not_zero(&opt->refcnt)) 393 opt = NULL; 394 else 395 opt = rcu_pointer_handoff(opt); 396 } 397 rcu_read_unlock(); 398 return opt; 399 } 400 401 static inline void txopt_put(struct ipv6_txoptions *opt) 402 { 403 if (opt && refcount_dec_and_test(&opt->refcnt)) 404 kfree_rcu(opt, rcu); 405 } 406 407 #if IS_ENABLED(CONFIG_IPV6) 408 struct ip6_flowlabel *__fl6_sock_lookup(struct sock *sk, __be32 label); 409 410 extern struct static_key_false_deferred ipv6_flowlabel_exclusive; 411 static inline struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, 412 __be32 label) 413 { 414 if (static_branch_unlikely(&ipv6_flowlabel_exclusive.key) && 415 READ_ONCE(sock_net(sk)->ipv6.flowlabel_has_excl)) 416 return __fl6_sock_lookup(sk, label) ? : ERR_PTR(-ENOENT); 417 418 return NULL; 419 } 420 #endif 421 422 struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space, 423 struct ip6_flowlabel *fl, 424 struct ipv6_txoptions *fopt); 425 void fl6_free_socklist(struct sock *sk); 426 int ipv6_flowlabel_opt(struct sock *sk, sockptr_t optval, int optlen); 427 int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq, 428 int flags); 429 int ip6_flowlabel_init(void); 430 void ip6_flowlabel_cleanup(void); 431 bool ip6_autoflowlabel(struct net *net, const struct ipv6_pinfo *np); 432 433 static inline void fl6_sock_release(struct ip6_flowlabel *fl) 434 { 435 if (fl) 436 atomic_dec(&fl->users); 437 } 438 439 void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info); 440 441 void icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, 442 struct icmp6hdr *thdr, int len); 443 444 int ip6_ra_control(struct sock *sk, int sel); 445 446 int ipv6_parse_hopopts(struct sk_buff *skb); 447 448 struct ipv6_txoptions *ipv6_dup_options(struct sock *sk, 449 struct ipv6_txoptions *opt); 450 struct ipv6_txoptions *ipv6_renew_options(struct sock *sk, 451 struct ipv6_txoptions *opt, 452 int newtype, 453 struct ipv6_opt_hdr *newopt); 454 struct ipv6_txoptions *__ipv6_fixup_options(struct ipv6_txoptions *opt_space, 455 struct ipv6_txoptions *opt); 456 457 static inline struct ipv6_txoptions * 458 ipv6_fixup_options(struct ipv6_txoptions *opt_space, struct ipv6_txoptions *opt) 459 { 460 if (!opt) 461 return NULL; 462 return __ipv6_fixup_options(opt_space, opt); 463 } 464 465 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb, 466 const struct inet6_skb_parm *opt); 467 struct ipv6_txoptions *ipv6_update_options(struct sock *sk, 468 struct ipv6_txoptions *opt); 469 470 /* This helper is specialized for BIG TCP needs. 471 * It assumes the hop_jumbo_hdr will immediately follow the IPV6 header. 472 * It assumes headers are already in skb->head. 473 * Returns 0, or IPPROTO_TCP if a BIG TCP packet is there. 474 */ 475 static inline int ipv6_has_hopopt_jumbo(const struct sk_buff *skb) 476 { 477 const struct hop_jumbo_hdr *jhdr; 478 const struct ipv6hdr *nhdr; 479 480 if (likely(skb->len <= GRO_LEGACY_MAX_SIZE)) 481 return 0; 482 483 if (skb->protocol != htons(ETH_P_IPV6)) 484 return 0; 485 486 if (skb_network_offset(skb) + 487 sizeof(struct ipv6hdr) + 488 sizeof(struct hop_jumbo_hdr) > skb_headlen(skb)) 489 return 0; 490 491 nhdr = ipv6_hdr(skb); 492 493 if (nhdr->nexthdr != NEXTHDR_HOP) 494 return 0; 495 496 jhdr = (const struct hop_jumbo_hdr *) (nhdr + 1); 497 if (jhdr->tlv_type != IPV6_TLV_JUMBO || jhdr->hdrlen != 0 || 498 jhdr->nexthdr != IPPROTO_TCP) 499 return 0; 500 return jhdr->nexthdr; 501 } 502 503 static inline bool ipv6_accept_ra(struct inet6_dev *idev) 504 { 505 /* If forwarding is enabled, RA are not accepted unless the special 506 * hybrid mode (accept_ra=2) is enabled. 507 */ 508 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 : 509 idev->cnf.accept_ra; 510 } 511 512 #define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */ 513 #define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */ 514 #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */ 515 516 int __ipv6_addr_type(const struct in6_addr *addr); 517 static inline int ipv6_addr_type(const struct in6_addr *addr) 518 { 519 return __ipv6_addr_type(addr) & 0xffff; 520 } 521 522 static inline int ipv6_addr_scope(const struct in6_addr *addr) 523 { 524 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK; 525 } 526 527 static inline int __ipv6_addr_src_scope(int type) 528 { 529 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16); 530 } 531 532 static inline int ipv6_addr_src_scope(const struct in6_addr *addr) 533 { 534 return __ipv6_addr_src_scope(__ipv6_addr_type(addr)); 535 } 536 537 static inline bool __ipv6_addr_needs_scope_id(int type) 538 { 539 return type & IPV6_ADDR_LINKLOCAL || 540 (type & IPV6_ADDR_MULTICAST && 541 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL))); 542 } 543 544 static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface) 545 { 546 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0; 547 } 548 549 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2) 550 { 551 return memcmp(a1, a2, sizeof(struct in6_addr)); 552 } 553 554 static inline bool 555 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m, 556 const struct in6_addr *a2) 557 { 558 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 559 const unsigned long *ul1 = (const unsigned long *)a1; 560 const unsigned long *ulm = (const unsigned long *)m; 561 const unsigned long *ul2 = (const unsigned long *)a2; 562 563 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) | 564 ((ul1[1] ^ ul2[1]) & ulm[1])); 565 #else 566 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) | 567 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) | 568 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) | 569 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3])); 570 #endif 571 } 572 573 static inline void ipv6_addr_prefix(struct in6_addr *pfx, 574 const struct in6_addr *addr, 575 int plen) 576 { 577 /* caller must guarantee 0 <= plen <= 128 */ 578 int o = plen >> 3, 579 b = plen & 0x7; 580 581 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr)); 582 memcpy(pfx->s6_addr, addr, o); 583 if (b != 0) 584 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b); 585 } 586 587 static inline void ipv6_addr_prefix_copy(struct in6_addr *addr, 588 const struct in6_addr *pfx, 589 int plen) 590 { 591 /* caller must guarantee 0 <= plen <= 128 */ 592 int o = plen >> 3, 593 b = plen & 0x7; 594 595 memcpy(addr->s6_addr, pfx, o); 596 if (b != 0) { 597 addr->s6_addr[o] &= ~(0xff00 >> b); 598 addr->s6_addr[o] |= (pfx->s6_addr[o] & (0xff00 >> b)); 599 } 600 } 601 602 static inline void __ipv6_addr_set_half(__be32 *addr, 603 __be32 wh, __be32 wl) 604 { 605 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 606 #if defined(__BIG_ENDIAN) 607 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) { 608 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl)); 609 return; 610 } 611 #elif defined(__LITTLE_ENDIAN) 612 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) { 613 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh)); 614 return; 615 } 616 #endif 617 #endif 618 addr[0] = wh; 619 addr[1] = wl; 620 } 621 622 static inline void ipv6_addr_set(struct in6_addr *addr, 623 __be32 w1, __be32 w2, 624 __be32 w3, __be32 w4) 625 { 626 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2); 627 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4); 628 } 629 630 static inline bool ipv6_addr_equal(const struct in6_addr *a1, 631 const struct in6_addr *a2) 632 { 633 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 634 const unsigned long *ul1 = (const unsigned long *)a1; 635 const unsigned long *ul2 = (const unsigned long *)a2; 636 637 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL; 638 #else 639 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) | 640 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) | 641 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) | 642 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0; 643 #endif 644 } 645 646 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 647 static inline bool __ipv6_prefix_equal64_half(const __be64 *a1, 648 const __be64 *a2, 649 unsigned int len) 650 { 651 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len)))) 652 return false; 653 return true; 654 } 655 656 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1, 657 const struct in6_addr *addr2, 658 unsigned int prefixlen) 659 { 660 const __be64 *a1 = (const __be64 *)addr1; 661 const __be64 *a2 = (const __be64 *)addr2; 662 663 if (prefixlen >= 64) { 664 if (a1[0] ^ a2[0]) 665 return false; 666 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64); 667 } 668 return __ipv6_prefix_equal64_half(a1, a2, prefixlen); 669 } 670 #else 671 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1, 672 const struct in6_addr *addr2, 673 unsigned int prefixlen) 674 { 675 const __be32 *a1 = addr1->s6_addr32; 676 const __be32 *a2 = addr2->s6_addr32; 677 unsigned int pdw, pbi; 678 679 /* check complete u32 in prefix */ 680 pdw = prefixlen >> 5; 681 if (pdw && memcmp(a1, a2, pdw << 2)) 682 return false; 683 684 /* check incomplete u32 in prefix */ 685 pbi = prefixlen & 0x1f; 686 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi)))) 687 return false; 688 689 return true; 690 } 691 #endif 692 693 static inline bool ipv6_addr_any(const struct in6_addr *a) 694 { 695 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 696 const unsigned long *ul = (const unsigned long *)a; 697 698 return (ul[0] | ul[1]) == 0UL; 699 #else 700 return (a->s6_addr32[0] | a->s6_addr32[1] | 701 a->s6_addr32[2] | a->s6_addr32[3]) == 0; 702 #endif 703 } 704 705 static inline u32 ipv6_addr_hash(const struct in6_addr *a) 706 { 707 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 708 const unsigned long *ul = (const unsigned long *)a; 709 unsigned long x = ul[0] ^ ul[1]; 710 711 return (u32)(x ^ (x >> 32)); 712 #else 713 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^ 714 a->s6_addr32[2] ^ a->s6_addr32[3]); 715 #endif 716 } 717 718 /* more secured version of ipv6_addr_hash() */ 719 static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval) 720 { 721 u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1]; 722 723 return jhash_3words(v, 724 (__force u32)a->s6_addr32[2], 725 (__force u32)a->s6_addr32[3], 726 initval); 727 } 728 729 static inline bool ipv6_addr_loopback(const struct in6_addr *a) 730 { 731 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 732 const __be64 *be = (const __be64 *)a; 733 734 return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL; 735 #else 736 return (a->s6_addr32[0] | a->s6_addr32[1] | 737 a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0; 738 #endif 739 } 740 741 /* 742 * Note that we must __force cast these to unsigned long to make sparse happy, 743 * since all of the endian-annotated types are fixed size regardless of arch. 744 */ 745 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a) 746 { 747 return ( 748 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 749 *(unsigned long *)a | 750 #else 751 (__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) | 752 #endif 753 (__force unsigned long)(a->s6_addr32[2] ^ 754 cpu_to_be32(0x0000ffff))) == 0UL; 755 } 756 757 static inline bool ipv6_addr_v4mapped_loopback(const struct in6_addr *a) 758 { 759 return ipv6_addr_v4mapped(a) && ipv4_is_loopback(a->s6_addr32[3]); 760 } 761 762 static inline u32 ipv6_portaddr_hash(const struct net *net, 763 const struct in6_addr *addr6, 764 unsigned int port) 765 { 766 unsigned int hash, mix = net_hash_mix(net); 767 768 if (ipv6_addr_any(addr6)) 769 hash = jhash_1word(0, mix); 770 else if (ipv6_addr_v4mapped(addr6)) 771 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix); 772 else 773 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix); 774 775 return hash ^ port; 776 } 777 778 /* 779 * Check for a RFC 4843 ORCHID address 780 * (Overlay Routable Cryptographic Hash Identifiers) 781 */ 782 static inline bool ipv6_addr_orchid(const struct in6_addr *a) 783 { 784 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010); 785 } 786 787 static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr) 788 { 789 return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000); 790 } 791 792 static inline void ipv6_addr_set_v4mapped(const __be32 addr, 793 struct in6_addr *v4mapped) 794 { 795 ipv6_addr_set(v4mapped, 796 0, 0, 797 htonl(0x0000FFFF), 798 addr); 799 } 800 801 /* 802 * find the first different bit between two addresses 803 * length of address must be a multiple of 32bits 804 */ 805 static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen) 806 { 807 const __be32 *a1 = token1, *a2 = token2; 808 int i; 809 810 addrlen >>= 2; 811 812 for (i = 0; i < addrlen; i++) { 813 __be32 xb = a1[i] ^ a2[i]; 814 if (xb) 815 return i * 32 + 31 - __fls(ntohl(xb)); 816 } 817 818 /* 819 * we should *never* get to this point since that 820 * would mean the addrs are equal 821 * 822 * However, we do get to it 8) And exacly, when 823 * addresses are equal 8) 824 * 825 * ip route add 1111::/128 via ... 826 * ip route add 1111::/64 via ... 827 * and we are here. 828 * 829 * Ideally, this function should stop comparison 830 * at prefix length. It does not, but it is still OK, 831 * if returned value is greater than prefix length. 832 * --ANK (980803) 833 */ 834 return addrlen << 5; 835 } 836 837 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 838 static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen) 839 { 840 const __be64 *a1 = token1, *a2 = token2; 841 int i; 842 843 addrlen >>= 3; 844 845 for (i = 0; i < addrlen; i++) { 846 __be64 xb = a1[i] ^ a2[i]; 847 if (xb) 848 return i * 64 + 63 - __fls(be64_to_cpu(xb)); 849 } 850 851 return addrlen << 6; 852 } 853 #endif 854 855 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen) 856 { 857 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 858 if (__builtin_constant_p(addrlen) && !(addrlen & 7)) 859 return __ipv6_addr_diff64(token1, token2, addrlen); 860 #endif 861 return __ipv6_addr_diff32(token1, token2, addrlen); 862 } 863 864 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2) 865 { 866 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr)); 867 } 868 869 __be32 ipv6_select_ident(struct net *net, 870 const struct in6_addr *daddr, 871 const struct in6_addr *saddr); 872 __be32 ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb); 873 874 int ip6_dst_hoplimit(struct dst_entry *dst); 875 876 static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6, 877 struct dst_entry *dst) 878 { 879 int hlimit; 880 881 if (ipv6_addr_is_multicast(&fl6->daddr)) 882 hlimit = np->mcast_hops; 883 else 884 hlimit = np->hop_limit; 885 if (hlimit < 0) 886 hlimit = ip6_dst_hoplimit(dst); 887 return hlimit; 888 } 889 890 /* copy IPv6 saddr & daddr to flow_keys, possibly using 64bit load/store 891 * Equivalent to : flow->v6addrs.src = iph->saddr; 892 * flow->v6addrs.dst = iph->daddr; 893 */ 894 static inline void iph_to_flow_copy_v6addrs(struct flow_keys *flow, 895 const struct ipv6hdr *iph) 896 { 897 BUILD_BUG_ON(offsetof(typeof(flow->addrs), v6addrs.dst) != 898 offsetof(typeof(flow->addrs), v6addrs.src) + 899 sizeof(flow->addrs.v6addrs.src)); 900 memcpy(&flow->addrs.v6addrs, &iph->saddr, sizeof(flow->addrs.v6addrs)); 901 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; 902 } 903 904 #if IS_ENABLED(CONFIG_IPV6) 905 906 static inline bool ipv6_can_nonlocal_bind(struct net *net, 907 struct inet_sock *inet) 908 { 909 return net->ipv6.sysctl.ip_nonlocal_bind || 910 inet->freebind || inet->transparent; 911 } 912 913 /* Sysctl settings for net ipv6.auto_flowlabels */ 914 #define IP6_AUTO_FLOW_LABEL_OFF 0 915 #define IP6_AUTO_FLOW_LABEL_OPTOUT 1 916 #define IP6_AUTO_FLOW_LABEL_OPTIN 2 917 #define IP6_AUTO_FLOW_LABEL_FORCED 3 918 919 #define IP6_AUTO_FLOW_LABEL_MAX IP6_AUTO_FLOW_LABEL_FORCED 920 921 #define IP6_DEFAULT_AUTO_FLOW_LABELS IP6_AUTO_FLOW_LABEL_OPTOUT 922 923 static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb, 924 __be32 flowlabel, bool autolabel, 925 struct flowi6 *fl6) 926 { 927 u32 hash; 928 929 /* @flowlabel may include more than a flow label, eg, the traffic class. 930 * Here we want only the flow label value. 931 */ 932 flowlabel &= IPV6_FLOWLABEL_MASK; 933 934 if (flowlabel || 935 net->ipv6.sysctl.auto_flowlabels == IP6_AUTO_FLOW_LABEL_OFF || 936 (!autolabel && 937 net->ipv6.sysctl.auto_flowlabels != IP6_AUTO_FLOW_LABEL_FORCED)) 938 return flowlabel; 939 940 hash = skb_get_hash_flowi6(skb, fl6); 941 942 /* Since this is being sent on the wire obfuscate hash a bit 943 * to minimize possbility that any useful information to an 944 * attacker is leaked. Only lower 20 bits are relevant. 945 */ 946 hash = rol32(hash, 16); 947 948 flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK; 949 950 if (net->ipv6.sysctl.flowlabel_state_ranges) 951 flowlabel |= IPV6_FLOWLABEL_STATELESS_FLAG; 952 953 return flowlabel; 954 } 955 956 static inline int ip6_default_np_autolabel(struct net *net) 957 { 958 switch (net->ipv6.sysctl.auto_flowlabels) { 959 case IP6_AUTO_FLOW_LABEL_OFF: 960 case IP6_AUTO_FLOW_LABEL_OPTIN: 961 default: 962 return 0; 963 case IP6_AUTO_FLOW_LABEL_OPTOUT: 964 case IP6_AUTO_FLOW_LABEL_FORCED: 965 return 1; 966 } 967 } 968 #else 969 static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb, 970 __be32 flowlabel, bool autolabel, 971 struct flowi6 *fl6) 972 { 973 return flowlabel; 974 } 975 static inline int ip6_default_np_autolabel(struct net *net) 976 { 977 return 0; 978 } 979 #endif 980 981 #if IS_ENABLED(CONFIG_IPV6) 982 static inline int ip6_multipath_hash_policy(const struct net *net) 983 { 984 return net->ipv6.sysctl.multipath_hash_policy; 985 } 986 static inline u32 ip6_multipath_hash_fields(const struct net *net) 987 { 988 return net->ipv6.sysctl.multipath_hash_fields; 989 } 990 #else 991 static inline int ip6_multipath_hash_policy(const struct net *net) 992 { 993 return 0; 994 } 995 static inline u32 ip6_multipath_hash_fields(const struct net *net) 996 { 997 return 0; 998 } 999 #endif 1000 1001 /* 1002 * Header manipulation 1003 */ 1004 static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass, 1005 __be32 flowlabel) 1006 { 1007 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel; 1008 } 1009 1010 static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr) 1011 { 1012 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK; 1013 } 1014 1015 static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr) 1016 { 1017 return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK; 1018 } 1019 1020 static inline u8 ip6_tclass(__be32 flowinfo) 1021 { 1022 return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT; 1023 } 1024 1025 static inline dscp_t ip6_dscp(__be32 flowinfo) 1026 { 1027 return inet_dsfield_to_dscp(ip6_tclass(flowinfo)); 1028 } 1029 1030 static inline __be32 ip6_make_flowinfo(unsigned int tclass, __be32 flowlabel) 1031 { 1032 return htonl(tclass << IPV6_TCLASS_SHIFT) | flowlabel; 1033 } 1034 1035 static inline __be32 flowi6_get_flowlabel(const struct flowi6 *fl6) 1036 { 1037 return fl6->flowlabel & IPV6_FLOWLABEL_MASK; 1038 } 1039 1040 /* 1041 * Prototypes exported by ipv6 1042 */ 1043 1044 /* 1045 * rcv function (called from netdevice level) 1046 */ 1047 1048 int ipv6_rcv(struct sk_buff *skb, struct net_device *dev, 1049 struct packet_type *pt, struct net_device *orig_dev); 1050 void ipv6_list_rcv(struct list_head *head, struct packet_type *pt, 1051 struct net_device *orig_dev); 1052 1053 int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 1054 1055 /* 1056 * upper-layer output functions 1057 */ 1058 int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6, 1059 __u32 mark, struct ipv6_txoptions *opt, int tclass, u32 priority); 1060 1061 int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr); 1062 1063 int ip6_append_data(struct sock *sk, 1064 int getfrag(void *from, char *to, int offset, int len, 1065 int odd, struct sk_buff *skb), 1066 void *from, size_t length, int transhdrlen, 1067 struct ipcm6_cookie *ipc6, struct flowi6 *fl6, 1068 struct rt6_info *rt, unsigned int flags); 1069 1070 int ip6_push_pending_frames(struct sock *sk); 1071 1072 void ip6_flush_pending_frames(struct sock *sk); 1073 1074 int ip6_send_skb(struct sk_buff *skb); 1075 1076 struct sk_buff *__ip6_make_skb(struct sock *sk, struct sk_buff_head *queue, 1077 struct inet_cork_full *cork, 1078 struct inet6_cork *v6_cork); 1079 struct sk_buff *ip6_make_skb(struct sock *sk, 1080 int getfrag(void *from, char *to, int offset, 1081 int len, int odd, struct sk_buff *skb), 1082 void *from, size_t length, int transhdrlen, 1083 struct ipcm6_cookie *ipc6, 1084 struct rt6_info *rt, unsigned int flags, 1085 struct inet_cork_full *cork); 1086 1087 static inline struct sk_buff *ip6_finish_skb(struct sock *sk) 1088 { 1089 return __ip6_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork, 1090 &inet6_sk(sk)->cork); 1091 } 1092 1093 int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst, 1094 struct flowi6 *fl6); 1095 struct dst_entry *ip6_dst_lookup_flow(struct net *net, const struct sock *sk, struct flowi6 *fl6, 1096 const struct in6_addr *final_dst); 1097 struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6, 1098 const struct in6_addr *final_dst, 1099 bool connected); 1100 struct dst_entry *ip6_dst_lookup_tunnel(struct sk_buff *skb, 1101 struct net_device *dev, 1102 struct net *net, struct socket *sock, 1103 struct in6_addr *saddr, 1104 const struct ip_tunnel_info *info, 1105 u8 protocol, bool use_cache); 1106 struct dst_entry *ip6_blackhole_route(struct net *net, 1107 struct dst_entry *orig_dst); 1108 1109 /* 1110 * skb processing functions 1111 */ 1112 1113 int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb); 1114 int ip6_forward(struct sk_buff *skb); 1115 int ip6_input(struct sk_buff *skb); 1116 int ip6_mc_input(struct sk_buff *skb); 1117 void ip6_protocol_deliver_rcu(struct net *net, struct sk_buff *skb, int nexthdr, 1118 bool have_final); 1119 1120 int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); 1121 int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); 1122 1123 /* 1124 * Extension header (options) processing 1125 */ 1126 1127 void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, 1128 u8 *proto, struct in6_addr **daddr_p, 1129 struct in6_addr *saddr); 1130 void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, 1131 u8 *proto); 1132 1133 int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp, 1134 __be16 *frag_offp); 1135 1136 bool ipv6_ext_hdr(u8 nexthdr); 1137 1138 enum { 1139 IP6_FH_F_FRAG = (1 << 0), 1140 IP6_FH_F_AUTH = (1 << 1), 1141 IP6_FH_F_SKIP_RH = (1 << 2), 1142 }; 1143 1144 /* find specified header and get offset to it */ 1145 int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target, 1146 unsigned short *fragoff, int *fragflg); 1147 1148 int ipv6_find_tlv(const struct sk_buff *skb, int offset, int type); 1149 1150 struct in6_addr *fl6_update_dst(struct flowi6 *fl6, 1151 const struct ipv6_txoptions *opt, 1152 struct in6_addr *orig); 1153 1154 /* 1155 * socket options (ipv6_sockglue.c) 1156 */ 1157 DECLARE_STATIC_KEY_FALSE(ip6_min_hopcount); 1158 1159 int do_ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, 1160 unsigned int optlen); 1161 int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, 1162 unsigned int optlen); 1163 int do_ipv6_getsockopt(struct sock *sk, int level, int optname, 1164 sockptr_t optval, sockptr_t optlen); 1165 int ipv6_getsockopt(struct sock *sk, int level, int optname, 1166 char __user *optval, int __user *optlen); 1167 1168 int __ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, 1169 int addr_len); 1170 int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len); 1171 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr, 1172 int addr_len); 1173 int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr); 1174 void ip6_datagram_release_cb(struct sock *sk); 1175 1176 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, 1177 int *addr_len); 1178 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len, 1179 int *addr_len); 1180 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, 1181 u32 info, u8 *payload); 1182 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info); 1183 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu); 1184 1185 void inet6_cleanup_sock(struct sock *sk); 1186 void inet6_sock_destruct(struct sock *sk); 1187 int inet6_release(struct socket *sock); 1188 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len); 1189 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 1190 int peer); 1191 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg); 1192 int inet6_compat_ioctl(struct socket *sock, unsigned int cmd, 1193 unsigned long arg); 1194 1195 int inet6_hash_connect(struct inet_timewait_death_row *death_row, 1196 struct sock *sk); 1197 int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size); 1198 int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 1199 int flags); 1200 1201 /* 1202 * reassembly.c 1203 */ 1204 extern const struct proto_ops inet6_stream_ops; 1205 extern const struct proto_ops inet6_dgram_ops; 1206 extern const struct proto_ops inet6_sockraw_ops; 1207 1208 struct group_source_req; 1209 struct group_filter; 1210 1211 int ip6_mc_source(int add, int omode, struct sock *sk, 1212 struct group_source_req *pgsr); 1213 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf, 1214 struct sockaddr_storage *list); 1215 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 1216 sockptr_t optval, size_t ss_offset); 1217 1218 #ifdef CONFIG_PROC_FS 1219 int ac6_proc_init(struct net *net); 1220 void ac6_proc_exit(struct net *net); 1221 int raw6_proc_init(void); 1222 void raw6_proc_exit(void); 1223 int tcp6_proc_init(struct net *net); 1224 void tcp6_proc_exit(struct net *net); 1225 int udp6_proc_init(struct net *net); 1226 void udp6_proc_exit(struct net *net); 1227 int udplite6_proc_init(void); 1228 void udplite6_proc_exit(void); 1229 int ipv6_misc_proc_init(void); 1230 void ipv6_misc_proc_exit(void); 1231 int snmp6_register_dev(struct inet6_dev *idev); 1232 int snmp6_unregister_dev(struct inet6_dev *idev); 1233 1234 #else 1235 static inline int ac6_proc_init(struct net *net) { return 0; } 1236 static inline void ac6_proc_exit(struct net *net) { } 1237 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; } 1238 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; } 1239 #endif 1240 1241 #ifdef CONFIG_SYSCTL 1242 struct ctl_table *ipv6_icmp_sysctl_init(struct net *net); 1243 struct ctl_table *ipv6_route_sysctl_init(struct net *net); 1244 int ipv6_sysctl_register(void); 1245 void ipv6_sysctl_unregister(void); 1246 #endif 1247 1248 int ipv6_sock_mc_join(struct sock *sk, int ifindex, 1249 const struct in6_addr *addr); 1250 int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex, 1251 const struct in6_addr *addr, unsigned int mode); 1252 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, 1253 const struct in6_addr *addr); 1254 1255 static inline int ip6_sock_set_v6only(struct sock *sk) 1256 { 1257 if (inet_sk(sk)->inet_num) 1258 return -EINVAL; 1259 lock_sock(sk); 1260 sk->sk_ipv6only = true; 1261 release_sock(sk); 1262 return 0; 1263 } 1264 1265 static inline void ip6_sock_set_recverr(struct sock *sk) 1266 { 1267 lock_sock(sk); 1268 inet6_sk(sk)->recverr = true; 1269 release_sock(sk); 1270 } 1271 1272 static inline int __ip6_sock_set_addr_preferences(struct sock *sk, int val) 1273 { 1274 unsigned int pref = 0; 1275 unsigned int prefmask = ~0; 1276 1277 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */ 1278 switch (val & (IPV6_PREFER_SRC_PUBLIC | 1279 IPV6_PREFER_SRC_TMP | 1280 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) { 1281 case IPV6_PREFER_SRC_PUBLIC: 1282 pref |= IPV6_PREFER_SRC_PUBLIC; 1283 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC | 1284 IPV6_PREFER_SRC_TMP); 1285 break; 1286 case IPV6_PREFER_SRC_TMP: 1287 pref |= IPV6_PREFER_SRC_TMP; 1288 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC | 1289 IPV6_PREFER_SRC_TMP); 1290 break; 1291 case IPV6_PREFER_SRC_PUBTMP_DEFAULT: 1292 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC | 1293 IPV6_PREFER_SRC_TMP); 1294 break; 1295 case 0: 1296 break; 1297 default: 1298 return -EINVAL; 1299 } 1300 1301 /* check HOME/COA conflicts */ 1302 switch (val & (IPV6_PREFER_SRC_HOME | IPV6_PREFER_SRC_COA)) { 1303 case IPV6_PREFER_SRC_HOME: 1304 prefmask &= ~IPV6_PREFER_SRC_COA; 1305 break; 1306 case IPV6_PREFER_SRC_COA: 1307 pref |= IPV6_PREFER_SRC_COA; 1308 break; 1309 case 0: 1310 break; 1311 default: 1312 return -EINVAL; 1313 } 1314 1315 /* check CGA/NONCGA conflicts */ 1316 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) { 1317 case IPV6_PREFER_SRC_CGA: 1318 case IPV6_PREFER_SRC_NONCGA: 1319 case 0: 1320 break; 1321 default: 1322 return -EINVAL; 1323 } 1324 1325 inet6_sk(sk)->srcprefs = (inet6_sk(sk)->srcprefs & prefmask) | pref; 1326 return 0; 1327 } 1328 1329 static inline int ip6_sock_set_addr_preferences(struct sock *sk, bool val) 1330 { 1331 int ret; 1332 1333 lock_sock(sk); 1334 ret = __ip6_sock_set_addr_preferences(sk, val); 1335 release_sock(sk); 1336 return ret; 1337 } 1338 1339 static inline void ip6_sock_set_recvpktinfo(struct sock *sk) 1340 { 1341 lock_sock(sk); 1342 inet6_sk(sk)->rxopt.bits.rxinfo = true; 1343 release_sock(sk); 1344 } 1345 1346 #endif /* _NET_IPV6_H */ 1347