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ipv6.h
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linux-6.19.14/include/net/ipv6.h
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 24struct 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 147struct 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 */ 157struct 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 168struct 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 177int ip6_fraglist_init(struct sk_buff *skb, unsigned int hlen, u8 *prevhdr, 178 u8 nexthdr, __be32 frag_id, 179 struct ip6_fraglist_iter *iter); 180void ip6_fraglist_prepare(struct sk_buff *skb, struct ip6_fraglist_iter *iter); 181 182static 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 192struct 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 205void 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); 208struct 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 */ 217extern int sysctl_mld_max_msf; 218extern 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 unsigned long _field = (field); \ 250 unsigned long _val = (val); \ 251 if (likely(_idev != NULL)) \ 252 mod##SNMP_ADD_STATS((_idev)->stats.statname, _field, _val); \ 253 mod##SNMP_ADD_STATS((net)->mib.statname##_statistics, _field, _val);\ 254}) 255 256#define _DEVUPD(net, statname, mod, idev, field, val) \ 257({ \ 258 struct inet6_dev *_idev = (idev); \ 259 unsigned long _val = (val); \ 260 if (likely(_idev != NULL)) \ 261 mod##SNMP_UPD_PO_STATS((_idev)->stats.statname, field, _val); \ 262 mod##SNMP_UPD_PO_STATS((net)->mib.statname##_statistics, field, _val);\ 263}) 264 265/* MIBs */ 266 267#define IP6_INC_STATS(net, idev,field) \ 268 _DEVINC(net, ipv6, , idev, field) 269#define __IP6_INC_STATS(net, idev,field) \ 270 _DEVINC(net, ipv6, __, idev, field) 271#define IP6_ADD_STATS(net, idev,field,val) \ 272 _DEVADD(net, ipv6, , idev, field, val) 273#define __IP6_ADD_STATS(net, idev,field,val) \ 274 _DEVADD(net, ipv6, __, idev, field, val) 275#define IP6_UPD_PO_STATS(net, idev,field,val) \ 276 _DEVUPD(net, ipv6, , idev, field, val) 277#define __IP6_UPD_PO_STATS(net, idev,field,val) \ 278 _DEVUPD(net, ipv6, __, idev, field, val) 279#define ICMP6_INC_STATS(net, idev, field) \ 280 _DEVINCATOMIC(net, icmpv6, , idev, field) 281#define __ICMP6_INC_STATS(net, idev, field) \ 282 _DEVINCATOMIC(net, icmpv6, __, idev, field) 283 284#define ICMP6MSGOUT_INC_STATS(net, idev, field) \ 285 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256) 286#define ICMP6MSGIN_INC_STATS(net, idev, field) \ 287 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field) 288 289struct ip6_ra_chain { 290 struct ip6_ra_chain *next; 291 struct sock *sk; 292 int sel; 293 void (*destructor)(struct sock *); 294}; 295 296extern struct ip6_ra_chain *ip6_ra_chain; 297extern rwlock_t ip6_ra_lock; 298 299/* 300 This structure is prepared by protocol, when parsing 301 ancillary data and passed to IPv6. 302 */ 303 304struct ipv6_txoptions { 305 refcount_t refcnt; 306 /* Length of this structure */ 307 int tot_len; 308 309 /* length of extension headers */ 310 311 __u16 opt_flen; /* after fragment hdr */ 312 __u16 opt_nflen; /* before fragment hdr */ 313 314 struct ipv6_opt_hdr *hopopt; 315 struct ipv6_opt_hdr *dst0opt; 316 struct ipv6_rt_hdr *srcrt; /* Routing Header */ 317 struct ipv6_opt_hdr *dst1opt; 318 struct rcu_head rcu; 319 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */ 320}; 321 322/* flowlabel_reflect sysctl values */ 323enum flowlabel_reflect { 324 FLOWLABEL_REFLECT_ESTABLISHED = 1, 325 FLOWLABEL_REFLECT_TCP_RESET = 2, 326 FLOWLABEL_REFLECT_ICMPV6_ECHO_REPLIES = 4, 327}; 328 329struct ip6_flowlabel { 330 struct ip6_flowlabel __rcu *next; 331 __be32 label; 332 atomic_t users; 333 struct in6_addr dst; 334 struct ipv6_txoptions *opt; 335 unsigned long linger; 336 struct rcu_head rcu; 337 u8 share; 338 union { 339 struct pid *pid; 340 kuid_t uid; 341 } owner; 342 unsigned long lastuse; 343 unsigned long expires; 344 struct net *fl_net; 345}; 346 347#define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF) 348#define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF) 349#define IPV6_FLOWLABEL_STATELESS_FLAG cpu_to_be32(0x00080000) 350 351#define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK) 352#define IPV6_TCLASS_SHIFT 20 353 354struct ipv6_fl_socklist { 355 struct ipv6_fl_socklist __rcu *next; 356 struct ip6_flowlabel *fl; 357 struct rcu_head rcu; 358}; 359 360struct ipcm6_cookie { 361 struct sockcm_cookie sockc; 362 __s16 hlimit; 363 __s16 tclass; 364 __u16 gso_size; 365 __s8 dontfrag; 366 struct ipv6_txoptions *opt; 367}; 368 369static inline void ipcm6_init_sk(struct ipcm6_cookie *ipc6, 370 const struct sock *sk) 371{ 372 *ipc6 = (struct ipcm6_cookie) { 373 .hlimit = -1, 374 .tclass = inet6_sk(sk)->tclass, 375 .dontfrag = inet6_test_bit(DONTFRAG, sk), 376 }; 377 378 sockcm_init(&ipc6->sockc, sk); 379} 380 381static inline struct ipv6_txoptions *txopt_get(const struct ipv6_pinfo *np) 382{ 383 struct ipv6_txoptions *opt; 384 385 rcu_read_lock(); 386 opt = rcu_dereference(np->opt); 387 if (opt) { 388 if (!refcount_inc_not_zero(&opt->refcnt)) 389 opt = NULL; 390 else 391 opt = rcu_pointer_handoff(opt); 392 } 393 rcu_read_unlock(); 394 return opt; 395} 396 397static inline void txopt_put(struct ipv6_txoptions *opt) 398{ 399 if (opt && refcount_dec_and_test(&opt->refcnt)) 400 kfree_rcu(opt, rcu); 401} 402 403#if IS_ENABLED(CONFIG_IPV6) 404struct ip6_flowlabel *__fl6_sock_lookup(struct sock *sk, __be32 label); 405 406extern struct static_key_false_deferred ipv6_flowlabel_exclusive; 407static inline struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, 408 __be32 label) 409{ 410 if (static_branch_unlikely(&ipv6_flowlabel_exclusive.key) && 411 READ_ONCE(sock_net(sk)->ipv6.flowlabel_has_excl)) 412 return __fl6_sock_lookup(sk, label) ? : ERR_PTR(-ENOENT); 413 414 return NULL; 415} 416#endif 417 418struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space, 419 struct ip6_flowlabel *fl, 420 struct ipv6_txoptions *fopt); 421void fl6_free_socklist(struct sock *sk); 422int ipv6_flowlabel_opt(struct sock *sk, sockptr_t optval, int optlen); 423int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq, 424 int flags); 425int ip6_flowlabel_init(void); 426void ip6_flowlabel_cleanup(void); 427bool ip6_autoflowlabel(struct net *net, const struct sock *sk); 428 429static inline void fl6_sock_release(struct ip6_flowlabel *fl) 430{ 431 if (fl) 432 atomic_dec(&fl->users); 433} 434 435enum skb_drop_reason icmpv6_notify(struct sk_buff *skb, u8 type, 436 u8 code, __be32 info); 437 438void icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, 439 struct icmp6hdr *thdr, int len); 440 441int ip6_ra_control(struct sock *sk, int sel); 442 443int ipv6_parse_hopopts(struct sk_buff *skb); 444 445struct ipv6_txoptions *ipv6_dup_options(struct sock *sk, 446 struct ipv6_txoptions *opt); 447struct ipv6_txoptions *ipv6_renew_options(struct sock *sk, 448 struct ipv6_txoptions *opt, 449 int newtype, 450 struct ipv6_opt_hdr *newopt); 451struct ipv6_txoptions *__ipv6_fixup_options(struct ipv6_txoptions *opt_space, 452 struct ipv6_txoptions *opt); 453 454static inline struct ipv6_txoptions * 455ipv6_fixup_options(struct ipv6_txoptions *opt_space, struct ipv6_txoptions *opt) 456{ 457 if (!opt) 458 return NULL; 459 return __ipv6_fixup_options(opt_space, opt); 460} 461 462bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb, 463 const struct inet6_skb_parm *opt); 464struct ipv6_txoptions *ipv6_update_options(struct sock *sk, 465 struct ipv6_txoptions *opt); 466 467/* This helper is specialized for BIG TCP needs. 468 * It assumes the hop_jumbo_hdr will immediately follow the IPV6 header. 469 * It assumes headers are already in skb->head. 470 * Returns: 0, or IPPROTO_TCP if a BIG TCP packet is there. 471 */ 472static inline int ipv6_has_hopopt_jumbo(const struct sk_buff *skb) 473{ 474 const struct hop_jumbo_hdr *jhdr; 475 const struct ipv6hdr *nhdr; 476 477 if (likely(skb->len <= GRO_LEGACY_MAX_SIZE)) 478 return 0; 479 480 if (skb->protocol != htons(ETH_P_IPV6)) 481 return 0; 482 483 if (skb_network_offset(skb) + 484 sizeof(struct ipv6hdr) + 485 sizeof(struct hop_jumbo_hdr) > skb_headlen(skb)) 486 return 0; 487 488 nhdr = ipv6_hdr(skb); 489 490 if (nhdr->nexthdr != NEXTHDR_HOP) 491 return 0; 492 493 jhdr = (const struct hop_jumbo_hdr *) (nhdr + 1); 494 if (jhdr->tlv_type != IPV6_TLV_JUMBO || jhdr->hdrlen != 0 || 495 jhdr->nexthdr != IPPROTO_TCP) 496 return 0; 497 return jhdr->nexthdr; 498} 499 500/* Return 0 if HBH header is successfully removed 501 * Or if HBH removal is unnecessary (packet is not big TCP) 502 * Return error to indicate dropping the packet 503 */ 504static inline int ipv6_hopopt_jumbo_remove(struct sk_buff *skb) 505{ 506 const int hophdr_len = sizeof(struct hop_jumbo_hdr); 507 int nexthdr = ipv6_has_hopopt_jumbo(skb); 508 struct ipv6hdr *h6; 509 510 if (!nexthdr) 511 return 0; 512 513 if (skb_cow_head(skb, 0)) 514 return -1; 515 516 /* Remove the HBH header. 517 * Layout: [Ethernet header][IPv6 header][HBH][L4 Header] 518 */ 519 memmove(skb_mac_header(skb) + hophdr_len, skb_mac_header(skb), 520 skb_network_header(skb) - skb_mac_header(skb) + 521 sizeof(struct ipv6hdr)); 522 523 __skb_pull(skb, hophdr_len); 524 skb->network_header += hophdr_len; 525 skb->mac_header += hophdr_len; 526 527 h6 = ipv6_hdr(skb); 528 h6->nexthdr = nexthdr; 529 530 return 0; 531} 532 533static inline bool ipv6_accept_ra(const struct inet6_dev *idev) 534{ 535 s32 accept_ra = READ_ONCE(idev->cnf.accept_ra); 536 537 /* If forwarding is enabled, RA are not accepted unless the special 538 * hybrid mode (accept_ra=2) is enabled. 539 */ 540 return READ_ONCE(idev->cnf.forwarding) ? accept_ra == 2 : 541 accept_ra; 542} 543 544#define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */ 545#define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */ 546#define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */ 547 548int __ipv6_addr_type(const struct in6_addr *addr); 549static inline int ipv6_addr_type(const struct in6_addr *addr) 550{ 551 return __ipv6_addr_type(addr) & 0xffff; 552} 553 554static inline int ipv6_addr_scope(const struct in6_addr *addr) 555{ 556 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK; 557} 558 559static inline int __ipv6_addr_src_scope(int type) 560{ 561 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16); 562} 563 564static inline int ipv6_addr_src_scope(const struct in6_addr *addr) 565{ 566 return __ipv6_addr_src_scope(__ipv6_addr_type(addr)); 567} 568 569static inline bool __ipv6_addr_needs_scope_id(int type) 570{ 571 return type & IPV6_ADDR_LINKLOCAL || 572 (type & IPV6_ADDR_MULTICAST && 573 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL))); 574} 575 576static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface) 577{ 578 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0; 579} 580 581static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2) 582{ 583 return memcmp(a1, a2, sizeof(struct in6_addr)); 584} 585 586static inline bool 587ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m, 588 const struct in6_addr *a2) 589{ 590#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 591 const unsigned long *ul1 = (const unsigned long *)a1; 592 const unsigned long *ulm = (const unsigned long *)m; 593 const unsigned long *ul2 = (const unsigned long *)a2; 594 595 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) | 596 ((ul1[1] ^ ul2[1]) & ulm[1])); 597#else 598 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) | 599 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) | 600 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) | 601 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3])); 602#endif 603} 604 605static inline void ipv6_addr_prefix(struct in6_addr *pfx, 606 const struct in6_addr *addr, 607 int plen) 608{ 609 /* caller must guarantee 0 <= plen <= 128 */ 610 int o = plen >> 3, 611 b = plen & 0x7; 612 613 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr)); 614 memcpy(pfx->s6_addr, addr, o); 615 if (b != 0) 616 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b); 617} 618 619static inline void ipv6_addr_prefix_copy(struct in6_addr *addr, 620 const struct in6_addr *pfx, 621 int plen) 622{ 623 /* caller must guarantee 0 <= plen <= 128 */ 624 int o = plen >> 3, 625 b = plen & 0x7; 626 627 memcpy(addr->s6_addr, pfx, o); 628 if (b != 0) { 629 addr->s6_addr[o] &= ~(0xff00 >> b); 630 addr->s6_addr[o] |= (pfx->s6_addr[o] & (0xff00 >> b)); 631 } 632} 633 634static inline void __ipv6_addr_set_half(__be32 *addr, 635 __be32 wh, __be32 wl) 636{ 637#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 638#if defined(__BIG_ENDIAN) 639 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) { 640 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl)); 641 return; 642 } 643#elif defined(__LITTLE_ENDIAN) 644 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) { 645 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh)); 646 return; 647 } 648#endif 649#endif 650 addr[0] = wh; 651 addr[1] = wl; 652} 653 654static inline void ipv6_addr_set(struct in6_addr *addr, 655 __be32 w1, __be32 w2, 656 __be32 w3, __be32 w4) 657{ 658 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2); 659 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4); 660} 661 662static inline bool ipv6_addr_equal(const struct in6_addr *a1, 663 const struct in6_addr *a2) 664{ 665#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 666 const unsigned long *ul1 = (const unsigned long *)a1; 667 const unsigned long *ul2 = (const unsigned long *)a2; 668 669 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL; 670#else 671 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) | 672 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) | 673 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) | 674 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0; 675#endif 676} 677 678#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 679static inline bool __ipv6_prefix_equal64_half(const __be64 *a1, 680 const __be64 *a2, 681 unsigned int len) 682{ 683 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len)))) 684 return false; 685 return true; 686} 687 688static inline bool ipv6_prefix_equal(const struct in6_addr *addr1, 689 const struct in6_addr *addr2, 690 unsigned int prefixlen) 691{ 692 const __be64 *a1 = (const __be64 *)addr1; 693 const __be64 *a2 = (const __be64 *)addr2; 694 695 if (prefixlen >= 64) { 696 if (a1[0] ^ a2[0]) 697 return false; 698 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64); 699 } 700 return __ipv6_prefix_equal64_half(a1, a2, prefixlen); 701} 702#else 703static inline bool ipv6_prefix_equal(const struct in6_addr *addr1, 704 const struct in6_addr *addr2, 705 unsigned int prefixlen) 706{ 707 const __be32 *a1 = addr1->s6_addr32; 708 const __be32 *a2 = addr2->s6_addr32; 709 unsigned int pdw, pbi; 710 711 /* check complete u32 in prefix */ 712 pdw = prefixlen >> 5; 713 if (pdw && memcmp(a1, a2, pdw << 2)) 714 return false; 715 716 /* check incomplete u32 in prefix */ 717 pbi = prefixlen & 0x1f; 718 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi)))) 719 return false; 720 721 return true; 722} 723#endif 724 725static inline bool ipv6_addr_any(const struct in6_addr *a) 726{ 727#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 728 const unsigned long *ul = (const unsigned long *)a; 729 730 return (ul[0] | ul[1]) == 0UL; 731#else 732 return (a->s6_addr32[0] | a->s6_addr32[1] | 733 a->s6_addr32[2] | a->s6_addr32[3]) == 0; 734#endif 735} 736 737static inline u32 ipv6_addr_hash(const struct in6_addr *a) 738{ 739#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 740 const unsigned long *ul = (const unsigned long *)a; 741 unsigned long x = ul[0] ^ ul[1]; 742 743 return (u32)(x ^ (x >> 32)); 744#else 745 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^ 746 a->s6_addr32[2] ^ a->s6_addr32[3]); 747#endif 748} 749 750/* more secured version of ipv6_addr_hash() */ 751static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval) 752{ 753 return jhash2((__force const u32 *)a->s6_addr32, 754 ARRAY_SIZE(a->s6_addr32), initval); 755} 756 757static inline bool ipv6_addr_loopback(const struct in6_addr *a) 758{ 759#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 760 const __be64 *be = (const __be64 *)a; 761 762 return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL; 763#else 764 return (a->s6_addr32[0] | a->s6_addr32[1] | 765 a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0; 766#endif 767} 768 769/* 770 * Note that we must __force cast these to unsigned long to make sparse happy, 771 * since all of the endian-annotated types are fixed size regardless of arch. 772 */ 773static inline bool ipv6_addr_v4mapped(const struct in6_addr *a) 774{ 775 return ( 776#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 777 *(unsigned long *)a | 778#else 779 (__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) | 780#endif 781 (__force unsigned long)(a->s6_addr32[2] ^ 782 cpu_to_be32(0x0000ffff))) == 0UL; 783} 784 785static inline bool ipv6_addr_v4mapped_loopback(const struct in6_addr *a) 786{ 787 return ipv6_addr_v4mapped(a) && ipv4_is_loopback(a->s6_addr32[3]); 788} 789 790static inline u32 ipv6_portaddr_hash(const struct net *net, 791 const struct in6_addr *addr6, 792 unsigned int port) 793{ 794 unsigned int hash, mix = net_hash_mix(net); 795 796 if (ipv6_addr_any(addr6)) 797 hash = jhash_1word(0, mix); 798 else if (ipv6_addr_v4mapped(addr6)) 799 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix); 800 else 801 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix); 802 803 return hash ^ port; 804} 805 806/* 807 * Check for a RFC 4843 ORCHID address 808 * (Overlay Routable Cryptographic Hash Identifiers) 809 */ 810static inline bool ipv6_addr_orchid(const struct in6_addr *a) 811{ 812 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010); 813} 814 815static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr) 816{ 817 return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000); 818} 819 820static inline void ipv6_addr_set_v4mapped(const __be32 addr, 821 struct in6_addr *v4mapped) 822{ 823 ipv6_addr_set(v4mapped, 824 0, 0, 825 htonl(0x0000FFFF), 826 addr); 827} 828 829/* 830 * find the first different bit between two addresses 831 * length of address must be a multiple of 32bits 832 */ 833static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen) 834{ 835 const __be32 *a1 = token1, *a2 = token2; 836 int i; 837 838 addrlen >>= 2; 839 840 for (i = 0; i < addrlen; i++) { 841 __be32 xb = a1[i] ^ a2[i]; 842 if (xb) 843 return i * 32 + 31 - __fls(ntohl(xb)); 844 } 845 846 /* 847 * we should *never* get to this point since that 848 * would mean the addrs are equal 849 * 850 * However, we do get to it 8) And exactly, when 851 * addresses are equal 8) 852 * 853 * ip route add 1111::/128 via ... 854 * ip route add 1111::/64 via ... 855 * and we are here. 856 * 857 * Ideally, this function should stop comparison 858 * at prefix length. It does not, but it is still OK, 859 * if returned value is greater than prefix length. 860 * --ANK (980803) 861 */ 862 return addrlen << 5; 863} 864 865#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 866static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen) 867{ 868 const __be64 *a1 = token1, *a2 = token2; 869 int i; 870 871 addrlen >>= 3; 872 873 for (i = 0; i < addrlen; i++) { 874 __be64 xb = a1[i] ^ a2[i]; 875 if (xb) 876 return i * 64 + 63 - __fls(be64_to_cpu(xb)); 877 } 878 879 return addrlen << 6; 880} 881#endif 882 883static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen) 884{ 885#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 886 if (__builtin_constant_p(addrlen) && !(addrlen & 7)) 887 return __ipv6_addr_diff64(token1, token2, addrlen); 888#endif 889 return __ipv6_addr_diff32(token1, token2, addrlen); 890} 891 892static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2) 893{ 894 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr)); 895} 896 897__be32 ipv6_select_ident(struct net *net, 898 const struct in6_addr *daddr, 899 const struct in6_addr *saddr); 900__be32 ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb); 901 902int ip6_dst_hoplimit(struct dst_entry *dst); 903 904static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6, 905 struct dst_entry *dst) 906{ 907 int hlimit; 908 909 if (ipv6_addr_is_multicast(&fl6->daddr)) 910 hlimit = READ_ONCE(np->mcast_hops); 911 else 912 hlimit = READ_ONCE(np->hop_limit); 913 if (hlimit < 0) 914 hlimit = ip6_dst_hoplimit(dst); 915 return hlimit; 916} 917 918/* copy IPv6 saddr & daddr to flow_keys, possibly using 64bit load/store 919 * Equivalent to : flow->v6addrs.src = iph->saddr; 920 * flow->v6addrs.dst = iph->daddr; 921 */ 922static inline void iph_to_flow_copy_v6addrs(struct flow_keys *flow, 923 const struct ipv6hdr *iph) 924{ 925 BUILD_BUG_ON(offsetof(typeof(flow->addrs), v6addrs.dst) != 926 offsetof(typeof(flow->addrs), v6addrs.src) + 927 sizeof(flow->addrs.v6addrs.src)); 928 memcpy(&flow->addrs.v6addrs, &iph->addrs, sizeof(flow->addrs.v6addrs)); 929 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; 930} 931 932#if IS_ENABLED(CONFIG_IPV6) 933 934static inline bool ipv6_can_nonlocal_bind(struct net *net, 935 struct inet_sock *inet) 936{ 937 return net->ipv6.sysctl.ip_nonlocal_bind || 938 test_bit(INET_FLAGS_FREEBIND, &inet->inet_flags) || 939 test_bit(INET_FLAGS_TRANSPARENT, &inet->inet_flags); 940} 941 942/* Sysctl settings for net ipv6.auto_flowlabels */ 943#define IP6_AUTO_FLOW_LABEL_OFF 0 944#define IP6_AUTO_FLOW_LABEL_OPTOUT 1 945#define IP6_AUTO_FLOW_LABEL_OPTIN 2 946#define IP6_AUTO_FLOW_LABEL_FORCED 3 947 948#define IP6_AUTO_FLOW_LABEL_MAX IP6_AUTO_FLOW_LABEL_FORCED 949 950#define IP6_DEFAULT_AUTO_FLOW_LABELS IP6_AUTO_FLOW_LABEL_OPTOUT 951 952static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb, 953 __be32 flowlabel, bool autolabel, 954 struct flowi6 *fl6) 955{ 956 u32 hash; 957 958 /* @flowlabel may include more than a flow label, eg, the traffic class. 959 * Here we want only the flow label value. 960 */ 961 flowlabel &= IPV6_FLOWLABEL_MASK; 962 963 if (flowlabel || 964 net->ipv6.sysctl.auto_flowlabels == IP6_AUTO_FLOW_LABEL_OFF || 965 (!autolabel && 966 net->ipv6.sysctl.auto_flowlabels != IP6_AUTO_FLOW_LABEL_FORCED)) 967 return flowlabel; 968 969 hash = skb_get_hash_flowi6(skb, fl6); 970 971 /* Since this is being sent on the wire obfuscate hash a bit 972 * to minimize possibility that any useful information to an 973 * attacker is leaked. Only lower 20 bits are relevant. 974 */ 975 hash = rol32(hash, 16); 976 977 flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK; 978 979 if (net->ipv6.sysctl.flowlabel_state_ranges) 980 flowlabel |= IPV6_FLOWLABEL_STATELESS_FLAG; 981 982 return flowlabel; 983} 984 985static inline int ip6_default_np_autolabel(struct net *net) 986{ 987 switch (net->ipv6.sysctl.auto_flowlabels) { 988 case IP6_AUTO_FLOW_LABEL_OFF: 989 case IP6_AUTO_FLOW_LABEL_OPTIN: 990 default: 991 return 0; 992 case IP6_AUTO_FLOW_LABEL_OPTOUT: 993 case IP6_AUTO_FLOW_LABEL_FORCED: 994 return 1; 995 } 996} 997#else 998static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb, 999 __be32 flowlabel, bool autolabel, 1000 struct flowi6 *fl6) 1001{ 1002 return flowlabel; 1003} 1004static inline int ip6_default_np_autolabel(struct net *net) 1005{ 1006 return 0; 1007} 1008#endif 1009 1010#if IS_ENABLED(CONFIG_IPV6) 1011static inline int ip6_multipath_hash_policy(const struct net *net) 1012{ 1013 return READ_ONCE(net->ipv6.sysctl.multipath_hash_policy); 1014} 1015static inline u32 ip6_multipath_hash_fields(const struct net *net) 1016{ 1017 return READ_ONCE(net->ipv6.sysctl.multipath_hash_fields); 1018} 1019#else 1020static inline int ip6_multipath_hash_policy(const struct net *net) 1021{ 1022 return 0; 1023} 1024static inline u32 ip6_multipath_hash_fields(const struct net *net) 1025{ 1026 return 0; 1027} 1028#endif 1029 1030/* 1031 * Header manipulation 1032 */ 1033static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass, 1034 __be32 flowlabel) 1035{ 1036 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel; 1037} 1038 1039static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr) 1040{ 1041 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK; 1042} 1043 1044static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr) 1045{ 1046 return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK; 1047} 1048 1049static inline u8 ip6_tclass(__be32 flowinfo) 1050{ 1051 return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT; 1052} 1053 1054static inline dscp_t ip6_dscp(__be32 flowinfo) 1055{ 1056 return inet_dsfield_to_dscp(ip6_tclass(flowinfo)); 1057} 1058 1059static inline __be32 ip6_make_flowinfo(unsigned int tclass, __be32 flowlabel) 1060{ 1061 return htonl(tclass << IPV6_TCLASS_SHIFT) | flowlabel; 1062} 1063 1064static inline __be32 flowi6_get_flowlabel(const struct flowi6 *fl6) 1065{ 1066 return fl6->flowlabel & IPV6_FLOWLABEL_MASK; 1067} 1068 1069/* 1070 * Prototypes exported by ipv6 1071 */ 1072 1073/* 1074 * rcv function (called from netdevice level) 1075 */ 1076 1077int ipv6_rcv(struct sk_buff *skb, struct net_device *dev, 1078 struct packet_type *pt, struct net_device *orig_dev); 1079void ipv6_list_rcv(struct list_head *head, struct packet_type *pt, 1080 struct net_device *orig_dev); 1081 1082int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 1083 1084/* 1085 * upper-layer output functions 1086 */ 1087int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6, 1088 __u32 mark, struct ipv6_txoptions *opt, int tclass, u32 priority); 1089 1090int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr); 1091 1092int ip6_append_data(struct sock *sk, 1093 int getfrag(void *from, char *to, int offset, int len, 1094 int odd, struct sk_buff *skb), 1095 void *from, size_t length, int transhdrlen, 1096 struct ipcm6_cookie *ipc6, struct flowi6 *fl6, 1097 struct rt6_info *rt, unsigned int flags); 1098 1099int ip6_push_pending_frames(struct sock *sk); 1100 1101void ip6_flush_pending_frames(struct sock *sk); 1102 1103int ip6_send_skb(struct sk_buff *skb); 1104 1105struct sk_buff *__ip6_make_skb(struct sock *sk, struct sk_buff_head *queue, 1106 struct inet_cork_full *cork, 1107 struct inet6_cork *v6_cork); 1108struct sk_buff *ip6_make_skb(struct sock *sk, 1109 int getfrag(void *from, char *to, int offset, 1110 int len, int odd, struct sk_buff *skb), 1111 void *from, size_t length, int transhdrlen, 1112 struct ipcm6_cookie *ipc6, 1113 struct rt6_info *rt, unsigned int flags, 1114 struct inet_cork_full *cork); 1115 1116static inline struct sk_buff *ip6_finish_skb(struct sock *sk) 1117{ 1118 return __ip6_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork, 1119 &inet6_sk(sk)->cork); 1120} 1121 1122int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst, 1123 struct flowi6 *fl6); 1124struct dst_entry *ip6_dst_lookup_flow(struct net *net, const struct sock *sk, struct flowi6 *fl6, 1125 const struct in6_addr *final_dst); 1126struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6, 1127 const struct in6_addr *final_dst, 1128 bool connected); 1129struct dst_entry *ip6_blackhole_route(struct net *net, 1130 struct dst_entry *orig_dst); 1131 1132/* 1133 * skb processing functions 1134 */ 1135 1136int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb); 1137int ip6_forward(struct sk_buff *skb); 1138int ip6_input(struct sk_buff *skb); 1139int ip6_mc_input(struct sk_buff *skb); 1140void ip6_protocol_deliver_rcu(struct net *net, struct sk_buff *skb, int nexthdr, 1141 bool have_final); 1142 1143int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); 1144int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); 1145 1146/* 1147 * Extension header (options) processing 1148 */ 1149 1150void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, 1151 u8 *proto, struct in6_addr **daddr_p, 1152 struct in6_addr *saddr); 1153void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, 1154 u8 *proto); 1155 1156int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp, 1157 __be16 *frag_offp); 1158 1159bool ipv6_ext_hdr(u8 nexthdr); 1160 1161enum { 1162 IP6_FH_F_FRAG = (1 << 0), 1163 IP6_FH_F_AUTH = (1 << 1), 1164 IP6_FH_F_SKIP_RH = (1 << 2), 1165}; 1166 1167/* find specified header and get offset to it */ 1168int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target, 1169 unsigned short *fragoff, int *fragflg); 1170 1171int ipv6_find_tlv(const struct sk_buff *skb, int offset, int type); 1172 1173struct in6_addr *fl6_update_dst(struct flowi6 *fl6, 1174 const struct ipv6_txoptions *opt, 1175 struct in6_addr *orig); 1176 1177/* 1178 * socket options (ipv6_sockglue.c) 1179 */ 1180DECLARE_STATIC_KEY_FALSE(ip6_min_hopcount); 1181 1182int do_ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, 1183 unsigned int optlen); 1184int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, 1185 unsigned int optlen); 1186int do_ipv6_getsockopt(struct sock *sk, int level, int optname, 1187 sockptr_t optval, sockptr_t optlen); 1188int ipv6_getsockopt(struct sock *sk, int level, int optname, 1189 char __user *optval, int __user *optlen); 1190 1191int __ip6_datagram_connect(struct sock *sk, struct sockaddr_unsized *addr, 1192 int addr_len); 1193int ip6_datagram_connect(struct sock *sk, struct sockaddr_unsized *addr, int addr_len); 1194int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr_unsized *addr, 1195 int addr_len); 1196int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr); 1197void ip6_datagram_release_cb(struct sock *sk); 1198 1199int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, 1200 int *addr_len); 1201int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len, 1202 int *addr_len); 1203void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, 1204 u32 info, u8 *payload); 1205void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info); 1206void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu); 1207 1208void inet6_cleanup_sock(struct sock *sk); 1209void inet6_sock_destruct(struct sock *sk); 1210int inet6_release(struct socket *sock); 1211int inet6_bind(struct socket *sock, struct sockaddr_unsized *uaddr, int addr_len); 1212int inet6_bind_sk(struct sock *sk, struct sockaddr_unsized *uaddr, int addr_len); 1213int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 1214 int peer); 1215int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg); 1216int inet6_compat_ioctl(struct socket *sock, unsigned int cmd, 1217 unsigned long arg); 1218 1219int inet6_hash_connect(struct inet_timewait_death_row *death_row, 1220 struct sock *sk); 1221int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size); 1222int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 1223 int flags); 1224 1225/* 1226 * reassembly.c 1227 */ 1228extern const struct proto_ops inet6_stream_ops; 1229extern const struct proto_ops inet6_dgram_ops; 1230extern const struct proto_ops inet6_sockraw_ops; 1231 1232struct group_source_req; 1233struct group_filter; 1234 1235int ip6_mc_source(int add, int omode, struct sock *sk, 1236 struct group_source_req *pgsr); 1237int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf, 1238 struct sockaddr_storage *list); 1239int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 1240 sockptr_t optval, size_t ss_offset); 1241 1242#ifdef CONFIG_PROC_FS 1243int ac6_proc_init(struct net *net); 1244void ac6_proc_exit(struct net *net); 1245int raw6_proc_init(void); 1246void raw6_proc_exit(void); 1247int tcp6_proc_init(struct net *net); 1248void tcp6_proc_exit(struct net *net); 1249int udp6_proc_init(struct net *net); 1250void udp6_proc_exit(struct net *net); 1251int udplite6_proc_init(void); 1252void udplite6_proc_exit(void); 1253int ipv6_misc_proc_init(void); 1254void ipv6_misc_proc_exit(void); 1255int snmp6_register_dev(struct inet6_dev *idev); 1256int snmp6_unregister_dev(struct inet6_dev *idev); 1257 1258#else 1259static inline int ac6_proc_init(struct net *net) { return 0; } 1260static inline void ac6_proc_exit(struct net *net) { } 1261static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; } 1262static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; } 1263#endif 1264 1265#ifdef CONFIG_SYSCTL 1266struct ctl_table *ipv6_icmp_sysctl_init(struct net *net); 1267size_t ipv6_icmp_sysctl_table_size(void); 1268struct ctl_table *ipv6_route_sysctl_init(struct net *net); 1269size_t ipv6_route_sysctl_table_size(struct net *net); 1270int ipv6_sysctl_register(void); 1271void ipv6_sysctl_unregister(void); 1272#endif 1273 1274int ipv6_sock_mc_join(struct sock *sk, int ifindex, 1275 const struct in6_addr *addr); 1276int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex, 1277 const struct in6_addr *addr, unsigned int mode); 1278int ipv6_sock_mc_drop(struct sock *sk, int ifindex, 1279 const struct in6_addr *addr); 1280 1281static inline int ip6_sock_set_v6only(struct sock *sk) 1282{ 1283 int ret = 0; 1284 1285 lock_sock(sk); 1286 if (inet_sk(sk)->inet_num) 1287 ret = -EINVAL; 1288 else 1289 sk->sk_ipv6only = true; 1290 release_sock(sk); 1291 return ret; 1292} 1293 1294static inline void ip6_sock_set_recverr(struct sock *sk) 1295{ 1296 inet6_set_bit(RECVERR6, sk); 1297} 1298 1299#define IPV6_PREFER_SRC_MASK (IPV6_PREFER_SRC_TMP | IPV6_PREFER_SRC_PUBLIC | \ 1300 IPV6_PREFER_SRC_COA) 1301 1302static inline int ip6_sock_set_addr_preferences(struct sock *sk, int val) 1303{ 1304 unsigned int prefmask = ~IPV6_PREFER_SRC_MASK; 1305 unsigned int pref = 0; 1306 1307 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */ 1308 switch (val & (IPV6_PREFER_SRC_PUBLIC | 1309 IPV6_PREFER_SRC_TMP | 1310 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) { 1311 case IPV6_PREFER_SRC_PUBLIC: 1312 pref |= IPV6_PREFER_SRC_PUBLIC; 1313 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC | 1314 IPV6_PREFER_SRC_TMP); 1315 break; 1316 case IPV6_PREFER_SRC_TMP: 1317 pref |= IPV6_PREFER_SRC_TMP; 1318 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC | 1319 IPV6_PREFER_SRC_TMP); 1320 break; 1321 case IPV6_PREFER_SRC_PUBTMP_DEFAULT: 1322 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC | 1323 IPV6_PREFER_SRC_TMP); 1324 break; 1325 case 0: 1326 break; 1327 default: 1328 return -EINVAL; 1329 } 1330 1331 /* check HOME/COA conflicts */ 1332 switch (val & (IPV6_PREFER_SRC_HOME | IPV6_PREFER_SRC_COA)) { 1333 case IPV6_PREFER_SRC_HOME: 1334 prefmask &= ~IPV6_PREFER_SRC_COA; 1335 break; 1336 case IPV6_PREFER_SRC_COA: 1337 pref |= IPV6_PREFER_SRC_COA; 1338 break; 1339 case 0: 1340 break; 1341 default: 1342 return -EINVAL; 1343 } 1344 1345 /* check CGA/NONCGA conflicts */ 1346 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) { 1347 case IPV6_PREFER_SRC_CGA: 1348 case IPV6_PREFER_SRC_NONCGA: 1349 case 0: 1350 break; 1351 default: 1352 return -EINVAL; 1353 } 1354 1355 WRITE_ONCE(inet6_sk(sk)->srcprefs, 1356 (READ_ONCE(inet6_sk(sk)->srcprefs) & prefmask) | pref); 1357 return 0; 1358} 1359 1360static inline void ip6_sock_set_recvpktinfo(struct sock *sk) 1361{ 1362 lock_sock(sk); 1363 inet6_sk(sk)->rxopt.bits.rxinfo = true; 1364 release_sock(sk); 1365} 1366 1367#define IPV6_ADDR_WORDS 4 1368 1369static inline void ipv6_addr_cpu_to_be32(__be32 *dst, const u32 *src) 1370{ 1371 cpu_to_be32_array(dst, src, IPV6_ADDR_WORDS); 1372} 1373 1374static inline void ipv6_addr_be32_to_cpu(u32 *dst, const __be32 *src) 1375{ 1376 be32_to_cpu_array(dst, src, IPV6_ADDR_WORDS); 1377} 1378 1379#endif /* _NET_IPV6_H */
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