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 ip6_fraglist_next(struct ip6_fraglist_iter * iter)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 ipcm6_init(struct ipcm6_cookie * ipc6)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 ipcm6_init_sk(struct ipcm6_cookie * ipc6,const struct sock * sk)375 static inline void ipcm6_init_sk(struct ipcm6_cookie *ipc6, 376 const struct sock *sk) 377 { 378 *ipc6 = (struct ipcm6_cookie) { 379 .hlimit = -1, 380 .tclass = inet6_sk(sk)->tclass, 381 .dontfrag = inet6_test_bit(DONTFRAG, sk), 382 }; 383 } 384 txopt_get(const struct ipv6_pinfo * np)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 txopt_put(struct ipv6_txoptions * opt)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; fl6_sock_lookup(struct sock * sk,__be32 label)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 sock *sk); 432 fl6_sock_release(struct ip6_flowlabel * fl)433 static inline void fl6_sock_release(struct ip6_flowlabel *fl) 434 { 435 if (fl) 436 atomic_dec(&fl->users); 437 } 438 439 enum skb_drop_reason icmpv6_notify(struct sk_buff *skb, u8 type, 440 u8 code, __be32 info); 441 442 void icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, 443 struct icmp6hdr *thdr, int len); 444 445 int ip6_ra_control(struct sock *sk, int sel); 446 447 int ipv6_parse_hopopts(struct sk_buff *skb); 448 449 struct ipv6_txoptions *ipv6_dup_options(struct sock *sk, 450 struct ipv6_txoptions *opt); 451 struct ipv6_txoptions *ipv6_renew_options(struct sock *sk, 452 struct ipv6_txoptions *opt, 453 int newtype, 454 struct ipv6_opt_hdr *newopt); 455 struct ipv6_txoptions *__ipv6_fixup_options(struct ipv6_txoptions *opt_space, 456 struct ipv6_txoptions *opt); 457 458 static inline struct ipv6_txoptions * ipv6_fixup_options(struct ipv6_txoptions * opt_space,struct ipv6_txoptions * opt)459 ipv6_fixup_options(struct ipv6_txoptions *opt_space, struct ipv6_txoptions *opt) 460 { 461 if (!opt) 462 return NULL; 463 return __ipv6_fixup_options(opt_space, opt); 464 } 465 466 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb, 467 const struct inet6_skb_parm *opt); 468 struct ipv6_txoptions *ipv6_update_options(struct sock *sk, 469 struct ipv6_txoptions *opt); 470 471 /* This helper is specialized for BIG TCP needs. 472 * It assumes the hop_jumbo_hdr will immediately follow the IPV6 header. 473 * It assumes headers are already in skb->head. 474 * Returns 0, or IPPROTO_TCP if a BIG TCP packet is there. 475 */ ipv6_has_hopopt_jumbo(const struct sk_buff * skb)476 static inline int ipv6_has_hopopt_jumbo(const struct sk_buff *skb) 477 { 478 const struct hop_jumbo_hdr *jhdr; 479 const struct ipv6hdr *nhdr; 480 481 if (likely(skb->len <= GRO_LEGACY_MAX_SIZE)) 482 return 0; 483 484 if (skb->protocol != htons(ETH_P_IPV6)) 485 return 0; 486 487 if (skb_network_offset(skb) + 488 sizeof(struct ipv6hdr) + 489 sizeof(struct hop_jumbo_hdr) > skb_headlen(skb)) 490 return 0; 491 492 nhdr = ipv6_hdr(skb); 493 494 if (nhdr->nexthdr != NEXTHDR_HOP) 495 return 0; 496 497 jhdr = (const struct hop_jumbo_hdr *) (nhdr + 1); 498 if (jhdr->tlv_type != IPV6_TLV_JUMBO || jhdr->hdrlen != 0 || 499 jhdr->nexthdr != IPPROTO_TCP) 500 return 0; 501 return jhdr->nexthdr; 502 } 503 504 /* Return 0 if HBH header is successfully removed 505 * Or if HBH removal is unnecessary (packet is not big TCP) 506 * Return error to indicate dropping the packet 507 */ ipv6_hopopt_jumbo_remove(struct sk_buff * skb)508 static inline int ipv6_hopopt_jumbo_remove(struct sk_buff *skb) 509 { 510 const int hophdr_len = sizeof(struct hop_jumbo_hdr); 511 int nexthdr = ipv6_has_hopopt_jumbo(skb); 512 struct ipv6hdr *h6; 513 514 if (!nexthdr) 515 return 0; 516 517 if (skb_cow_head(skb, 0)) 518 return -1; 519 520 /* Remove the HBH header. 521 * Layout: [Ethernet header][IPv6 header][HBH][L4 Header] 522 */ 523 memmove(skb_mac_header(skb) + hophdr_len, skb_mac_header(skb), 524 skb_network_header(skb) - skb_mac_header(skb) + 525 sizeof(struct ipv6hdr)); 526 527 __skb_pull(skb, hophdr_len); 528 skb->network_header += hophdr_len; 529 skb->mac_header += hophdr_len; 530 531 h6 = ipv6_hdr(skb); 532 h6->nexthdr = nexthdr; 533 534 return 0; 535 } 536 ipv6_accept_ra(const struct inet6_dev * idev)537 static inline bool ipv6_accept_ra(const struct inet6_dev *idev) 538 { 539 s32 accept_ra = READ_ONCE(idev->cnf.accept_ra); 540 541 /* If forwarding is enabled, RA are not accepted unless the special 542 * hybrid mode (accept_ra=2) is enabled. 543 */ 544 return READ_ONCE(idev->cnf.forwarding) ? accept_ra == 2 : 545 accept_ra; 546 } 547 548 #define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */ 549 #define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */ 550 #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */ 551 552 int __ipv6_addr_type(const struct in6_addr *addr); ipv6_addr_type(const struct in6_addr * addr)553 static inline int ipv6_addr_type(const struct in6_addr *addr) 554 { 555 return __ipv6_addr_type(addr) & 0xffff; 556 } 557 ipv6_addr_scope(const struct in6_addr * addr)558 static inline int ipv6_addr_scope(const struct in6_addr *addr) 559 { 560 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK; 561 } 562 __ipv6_addr_src_scope(int type)563 static inline int __ipv6_addr_src_scope(int type) 564 { 565 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16); 566 } 567 ipv6_addr_src_scope(const struct in6_addr * addr)568 static inline int ipv6_addr_src_scope(const struct in6_addr *addr) 569 { 570 return __ipv6_addr_src_scope(__ipv6_addr_type(addr)); 571 } 572 __ipv6_addr_needs_scope_id(int type)573 static inline bool __ipv6_addr_needs_scope_id(int type) 574 { 575 return type & IPV6_ADDR_LINKLOCAL || 576 (type & IPV6_ADDR_MULTICAST && 577 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL))); 578 } 579 ipv6_iface_scope_id(const struct in6_addr * addr,int iface)580 static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface) 581 { 582 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0; 583 } 584 ipv6_addr_cmp(const struct in6_addr * a1,const struct in6_addr * a2)585 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2) 586 { 587 return memcmp(a1, a2, sizeof(struct in6_addr)); 588 } 589 590 static inline bool ipv6_masked_addr_cmp(const struct in6_addr * a1,const struct in6_addr * m,const struct in6_addr * a2)591 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m, 592 const struct in6_addr *a2) 593 { 594 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 595 const unsigned long *ul1 = (const unsigned long *)a1; 596 const unsigned long *ulm = (const unsigned long *)m; 597 const unsigned long *ul2 = (const unsigned long *)a2; 598 599 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) | 600 ((ul1[1] ^ ul2[1]) & ulm[1])); 601 #else 602 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) | 603 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) | 604 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) | 605 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3])); 606 #endif 607 } 608 ipv6_addr_prefix(struct in6_addr * pfx,const struct in6_addr * addr,int plen)609 static inline void ipv6_addr_prefix(struct in6_addr *pfx, 610 const struct in6_addr *addr, 611 int plen) 612 { 613 /* caller must guarantee 0 <= plen <= 128 */ 614 int o = plen >> 3, 615 b = plen & 0x7; 616 617 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr)); 618 memcpy(pfx->s6_addr, addr, o); 619 if (b != 0) 620 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b); 621 } 622 ipv6_addr_prefix_copy(struct in6_addr * addr,const struct in6_addr * pfx,int plen)623 static inline void ipv6_addr_prefix_copy(struct in6_addr *addr, 624 const struct in6_addr *pfx, 625 int plen) 626 { 627 /* caller must guarantee 0 <= plen <= 128 */ 628 int o = plen >> 3, 629 b = plen & 0x7; 630 631 memcpy(addr->s6_addr, pfx, o); 632 if (b != 0) { 633 addr->s6_addr[o] &= ~(0xff00 >> b); 634 addr->s6_addr[o] |= (pfx->s6_addr[o] & (0xff00 >> b)); 635 } 636 } 637 __ipv6_addr_set_half(__be32 * addr,__be32 wh,__be32 wl)638 static inline void __ipv6_addr_set_half(__be32 *addr, 639 __be32 wh, __be32 wl) 640 { 641 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 642 #if defined(__BIG_ENDIAN) 643 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) { 644 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl)); 645 return; 646 } 647 #elif defined(__LITTLE_ENDIAN) 648 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) { 649 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh)); 650 return; 651 } 652 #endif 653 #endif 654 addr[0] = wh; 655 addr[1] = wl; 656 } 657 ipv6_addr_set(struct in6_addr * addr,__be32 w1,__be32 w2,__be32 w3,__be32 w4)658 static inline void ipv6_addr_set(struct in6_addr *addr, 659 __be32 w1, __be32 w2, 660 __be32 w3, __be32 w4) 661 { 662 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2); 663 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4); 664 } 665 ipv6_addr_equal(const struct in6_addr * a1,const struct in6_addr * a2)666 static inline bool ipv6_addr_equal(const struct in6_addr *a1, 667 const struct in6_addr *a2) 668 { 669 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 670 const unsigned long *ul1 = (const unsigned long *)a1; 671 const unsigned long *ul2 = (const unsigned long *)a2; 672 673 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL; 674 #else 675 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) | 676 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) | 677 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) | 678 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0; 679 #endif 680 } 681 682 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 __ipv6_prefix_equal64_half(const __be64 * a1,const __be64 * a2,unsigned int len)683 static inline bool __ipv6_prefix_equal64_half(const __be64 *a1, 684 const __be64 *a2, 685 unsigned int len) 686 { 687 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len)))) 688 return false; 689 return true; 690 } 691 ipv6_prefix_equal(const struct in6_addr * addr1,const struct in6_addr * addr2,unsigned int prefixlen)692 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1, 693 const struct in6_addr *addr2, 694 unsigned int prefixlen) 695 { 696 const __be64 *a1 = (const __be64 *)addr1; 697 const __be64 *a2 = (const __be64 *)addr2; 698 699 if (prefixlen >= 64) { 700 if (a1[0] ^ a2[0]) 701 return false; 702 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64); 703 } 704 return __ipv6_prefix_equal64_half(a1, a2, prefixlen); 705 } 706 #else ipv6_prefix_equal(const struct in6_addr * addr1,const struct in6_addr * addr2,unsigned int prefixlen)707 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1, 708 const struct in6_addr *addr2, 709 unsigned int prefixlen) 710 { 711 const __be32 *a1 = addr1->s6_addr32; 712 const __be32 *a2 = addr2->s6_addr32; 713 unsigned int pdw, pbi; 714 715 /* check complete u32 in prefix */ 716 pdw = prefixlen >> 5; 717 if (pdw && memcmp(a1, a2, pdw << 2)) 718 return false; 719 720 /* check incomplete u32 in prefix */ 721 pbi = prefixlen & 0x1f; 722 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi)))) 723 return false; 724 725 return true; 726 } 727 #endif 728 ipv6_addr_any(const struct in6_addr * a)729 static inline bool ipv6_addr_any(const struct in6_addr *a) 730 { 731 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 732 const unsigned long *ul = (const unsigned long *)a; 733 734 return (ul[0] | ul[1]) == 0UL; 735 #else 736 return (a->s6_addr32[0] | a->s6_addr32[1] | 737 a->s6_addr32[2] | a->s6_addr32[3]) == 0; 738 #endif 739 } 740 ipv6_addr_hash(const struct in6_addr * a)741 static inline u32 ipv6_addr_hash(const struct in6_addr *a) 742 { 743 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 744 const unsigned long *ul = (const unsigned long *)a; 745 unsigned long x = ul[0] ^ ul[1]; 746 747 return (u32)(x ^ (x >> 32)); 748 #else 749 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^ 750 a->s6_addr32[2] ^ a->s6_addr32[3]); 751 #endif 752 } 753 754 /* more secured version of ipv6_addr_hash() */ __ipv6_addr_jhash(const struct in6_addr * a,const u32 initval)755 static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval) 756 { 757 return jhash2((__force const u32 *)a->s6_addr32, 758 ARRAY_SIZE(a->s6_addr32), initval); 759 } 760 ipv6_addr_loopback(const struct in6_addr * a)761 static inline bool ipv6_addr_loopback(const struct in6_addr *a) 762 { 763 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 764 const __be64 *be = (const __be64 *)a; 765 766 return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL; 767 #else 768 return (a->s6_addr32[0] | a->s6_addr32[1] | 769 a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0; 770 #endif 771 } 772 773 /* 774 * Note that we must __force cast these to unsigned long to make sparse happy, 775 * since all of the endian-annotated types are fixed size regardless of arch. 776 */ ipv6_addr_v4mapped(const struct in6_addr * a)777 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a) 778 { 779 return ( 780 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 781 *(unsigned long *)a | 782 #else 783 (__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) | 784 #endif 785 (__force unsigned long)(a->s6_addr32[2] ^ 786 cpu_to_be32(0x0000ffff))) == 0UL; 787 } 788 ipv6_addr_v4mapped_loopback(const struct in6_addr * a)789 static inline bool ipv6_addr_v4mapped_loopback(const struct in6_addr *a) 790 { 791 return ipv6_addr_v4mapped(a) && ipv4_is_loopback(a->s6_addr32[3]); 792 } 793 ipv6_portaddr_hash(const struct net * net,const struct in6_addr * addr6,unsigned int port)794 static inline u32 ipv6_portaddr_hash(const struct net *net, 795 const struct in6_addr *addr6, 796 unsigned int port) 797 { 798 unsigned int hash, mix = net_hash_mix(net); 799 800 if (ipv6_addr_any(addr6)) 801 hash = jhash_1word(0, mix); 802 else if (ipv6_addr_v4mapped(addr6)) 803 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix); 804 else 805 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix); 806 807 return hash ^ port; 808 } 809 810 /* 811 * Check for a RFC 4843 ORCHID address 812 * (Overlay Routable Cryptographic Hash Identifiers) 813 */ ipv6_addr_orchid(const struct in6_addr * a)814 static inline bool ipv6_addr_orchid(const struct in6_addr *a) 815 { 816 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010); 817 } 818 ipv6_addr_is_multicast(const struct in6_addr * addr)819 static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr) 820 { 821 return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000); 822 } 823 ipv6_addr_set_v4mapped(const __be32 addr,struct in6_addr * v4mapped)824 static inline void ipv6_addr_set_v4mapped(const __be32 addr, 825 struct in6_addr *v4mapped) 826 { 827 ipv6_addr_set(v4mapped, 828 0, 0, 829 htonl(0x0000FFFF), 830 addr); 831 } 832 833 /* 834 * find the first different bit between two addresses 835 * length of address must be a multiple of 32bits 836 */ __ipv6_addr_diff32(const void * token1,const void * token2,int addrlen)837 static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen) 838 { 839 const __be32 *a1 = token1, *a2 = token2; 840 int i; 841 842 addrlen >>= 2; 843 844 for (i = 0; i < addrlen; i++) { 845 __be32 xb = a1[i] ^ a2[i]; 846 if (xb) 847 return i * 32 + 31 - __fls(ntohl(xb)); 848 } 849 850 /* 851 * we should *never* get to this point since that 852 * would mean the addrs are equal 853 * 854 * However, we do get to it 8) And exactly, when 855 * addresses are equal 8) 856 * 857 * ip route add 1111::/128 via ... 858 * ip route add 1111::/64 via ... 859 * and we are here. 860 * 861 * Ideally, this function should stop comparison 862 * at prefix length. It does not, but it is still OK, 863 * if returned value is greater than prefix length. 864 * --ANK (980803) 865 */ 866 return addrlen << 5; 867 } 868 869 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 __ipv6_addr_diff64(const void * token1,const void * token2,int addrlen)870 static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen) 871 { 872 const __be64 *a1 = token1, *a2 = token2; 873 int i; 874 875 addrlen >>= 3; 876 877 for (i = 0; i < addrlen; i++) { 878 __be64 xb = a1[i] ^ a2[i]; 879 if (xb) 880 return i * 64 + 63 - __fls(be64_to_cpu(xb)); 881 } 882 883 return addrlen << 6; 884 } 885 #endif 886 __ipv6_addr_diff(const void * token1,const void * token2,int addrlen)887 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen) 888 { 889 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 890 if (__builtin_constant_p(addrlen) && !(addrlen & 7)) 891 return __ipv6_addr_diff64(token1, token2, addrlen); 892 #endif 893 return __ipv6_addr_diff32(token1, token2, addrlen); 894 } 895 ipv6_addr_diff(const struct in6_addr * a1,const struct in6_addr * a2)896 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2) 897 { 898 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr)); 899 } 900 901 __be32 ipv6_select_ident(struct net *net, 902 const struct in6_addr *daddr, 903 const struct in6_addr *saddr); 904 __be32 ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb); 905 906 int ip6_dst_hoplimit(struct dst_entry *dst); 907 ip6_sk_dst_hoplimit(struct ipv6_pinfo * np,struct flowi6 * fl6,struct dst_entry * dst)908 static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6, 909 struct dst_entry *dst) 910 { 911 int hlimit; 912 913 if (ipv6_addr_is_multicast(&fl6->daddr)) 914 hlimit = READ_ONCE(np->mcast_hops); 915 else 916 hlimit = READ_ONCE(np->hop_limit); 917 if (hlimit < 0) 918 hlimit = ip6_dst_hoplimit(dst); 919 return hlimit; 920 } 921 922 /* copy IPv6 saddr & daddr to flow_keys, possibly using 64bit load/store 923 * Equivalent to : flow->v6addrs.src = iph->saddr; 924 * flow->v6addrs.dst = iph->daddr; 925 */ iph_to_flow_copy_v6addrs(struct flow_keys * flow,const struct ipv6hdr * iph)926 static inline void iph_to_flow_copy_v6addrs(struct flow_keys *flow, 927 const struct ipv6hdr *iph) 928 { 929 BUILD_BUG_ON(offsetof(typeof(flow->addrs), v6addrs.dst) != 930 offsetof(typeof(flow->addrs), v6addrs.src) + 931 sizeof(flow->addrs.v6addrs.src)); 932 memcpy(&flow->addrs.v6addrs, &iph->addrs, sizeof(flow->addrs.v6addrs)); 933 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; 934 } 935 936 #if IS_ENABLED(CONFIG_IPV6) 937 ipv6_can_nonlocal_bind(struct net * net,struct inet_sock * inet)938 static inline bool ipv6_can_nonlocal_bind(struct net *net, 939 struct inet_sock *inet) 940 { 941 return net->ipv6.sysctl.ip_nonlocal_bind || 942 test_bit(INET_FLAGS_FREEBIND, &inet->inet_flags) || 943 test_bit(INET_FLAGS_TRANSPARENT, &inet->inet_flags); 944 } 945 946 /* Sysctl settings for net ipv6.auto_flowlabels */ 947 #define IP6_AUTO_FLOW_LABEL_OFF 0 948 #define IP6_AUTO_FLOW_LABEL_OPTOUT 1 949 #define IP6_AUTO_FLOW_LABEL_OPTIN 2 950 #define IP6_AUTO_FLOW_LABEL_FORCED 3 951 952 #define IP6_AUTO_FLOW_LABEL_MAX IP6_AUTO_FLOW_LABEL_FORCED 953 954 #define IP6_DEFAULT_AUTO_FLOW_LABELS IP6_AUTO_FLOW_LABEL_OPTOUT 955 ip6_make_flowlabel(struct net * net,struct sk_buff * skb,__be32 flowlabel,bool autolabel,struct flowi6 * fl6)956 static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb, 957 __be32 flowlabel, bool autolabel, 958 struct flowi6 *fl6) 959 { 960 u32 hash; 961 962 /* @flowlabel may include more than a flow label, eg, the traffic class. 963 * Here we want only the flow label value. 964 */ 965 flowlabel &= IPV6_FLOWLABEL_MASK; 966 967 if (flowlabel || 968 net->ipv6.sysctl.auto_flowlabels == IP6_AUTO_FLOW_LABEL_OFF || 969 (!autolabel && 970 net->ipv6.sysctl.auto_flowlabels != IP6_AUTO_FLOW_LABEL_FORCED)) 971 return flowlabel; 972 973 hash = skb_get_hash_flowi6(skb, fl6); 974 975 /* Since this is being sent on the wire obfuscate hash a bit 976 * to minimize possibility that any useful information to an 977 * attacker is leaked. Only lower 20 bits are relevant. 978 */ 979 hash = rol32(hash, 16); 980 981 flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK; 982 983 if (net->ipv6.sysctl.flowlabel_state_ranges) 984 flowlabel |= IPV6_FLOWLABEL_STATELESS_FLAG; 985 986 return flowlabel; 987 } 988 ip6_default_np_autolabel(struct net * net)989 static inline int ip6_default_np_autolabel(struct net *net) 990 { 991 switch (net->ipv6.sysctl.auto_flowlabels) { 992 case IP6_AUTO_FLOW_LABEL_OFF: 993 case IP6_AUTO_FLOW_LABEL_OPTIN: 994 default: 995 return 0; 996 case IP6_AUTO_FLOW_LABEL_OPTOUT: 997 case IP6_AUTO_FLOW_LABEL_FORCED: 998 return 1; 999 } 1000 } 1001 #else ip6_make_flowlabel(struct net * net,struct sk_buff * skb,__be32 flowlabel,bool autolabel,struct flowi6 * fl6)1002 static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb, 1003 __be32 flowlabel, bool autolabel, 1004 struct flowi6 *fl6) 1005 { 1006 return flowlabel; 1007 } ip6_default_np_autolabel(struct net * net)1008 static inline int ip6_default_np_autolabel(struct net *net) 1009 { 1010 return 0; 1011 } 1012 #endif 1013 1014 #if IS_ENABLED(CONFIG_IPV6) ip6_multipath_hash_policy(const struct net * net)1015 static inline int ip6_multipath_hash_policy(const struct net *net) 1016 { 1017 return net->ipv6.sysctl.multipath_hash_policy; 1018 } ip6_multipath_hash_fields(const struct net * net)1019 static inline u32 ip6_multipath_hash_fields(const struct net *net) 1020 { 1021 return net->ipv6.sysctl.multipath_hash_fields; 1022 } 1023 #else ip6_multipath_hash_policy(const struct net * net)1024 static inline int ip6_multipath_hash_policy(const struct net *net) 1025 { 1026 return 0; 1027 } ip6_multipath_hash_fields(const struct net * net)1028 static inline u32 ip6_multipath_hash_fields(const struct net *net) 1029 { 1030 return 0; 1031 } 1032 #endif 1033 1034 /* 1035 * Header manipulation 1036 */ ip6_flow_hdr(struct ipv6hdr * hdr,unsigned int tclass,__be32 flowlabel)1037 static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass, 1038 __be32 flowlabel) 1039 { 1040 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel; 1041 } 1042 ip6_flowinfo(const struct ipv6hdr * hdr)1043 static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr) 1044 { 1045 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK; 1046 } 1047 ip6_flowlabel(const struct ipv6hdr * hdr)1048 static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr) 1049 { 1050 return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK; 1051 } 1052 ip6_tclass(__be32 flowinfo)1053 static inline u8 ip6_tclass(__be32 flowinfo) 1054 { 1055 return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT; 1056 } 1057 ip6_dscp(__be32 flowinfo)1058 static inline dscp_t ip6_dscp(__be32 flowinfo) 1059 { 1060 return inet_dsfield_to_dscp(ip6_tclass(flowinfo)); 1061 } 1062 ip6_make_flowinfo(unsigned int tclass,__be32 flowlabel)1063 static inline __be32 ip6_make_flowinfo(unsigned int tclass, __be32 flowlabel) 1064 { 1065 return htonl(tclass << IPV6_TCLASS_SHIFT) | flowlabel; 1066 } 1067 flowi6_get_flowlabel(const struct flowi6 * fl6)1068 static inline __be32 flowi6_get_flowlabel(const struct flowi6 *fl6) 1069 { 1070 return fl6->flowlabel & IPV6_FLOWLABEL_MASK; 1071 } 1072 1073 /* 1074 * Prototypes exported by ipv6 1075 */ 1076 1077 /* 1078 * rcv function (called from netdevice level) 1079 */ 1080 1081 int ipv6_rcv(struct sk_buff *skb, struct net_device *dev, 1082 struct packet_type *pt, struct net_device *orig_dev); 1083 void ipv6_list_rcv(struct list_head *head, struct packet_type *pt, 1084 struct net_device *orig_dev); 1085 1086 int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 1087 1088 /* 1089 * upper-layer output functions 1090 */ 1091 int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6, 1092 __u32 mark, struct ipv6_txoptions *opt, int tclass, u32 priority); 1093 1094 int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr); 1095 1096 int ip6_append_data(struct sock *sk, 1097 int getfrag(void *from, char *to, int offset, int len, 1098 int odd, struct sk_buff *skb), 1099 void *from, size_t length, int transhdrlen, 1100 struct ipcm6_cookie *ipc6, struct flowi6 *fl6, 1101 struct rt6_info *rt, unsigned int flags); 1102 1103 int ip6_push_pending_frames(struct sock *sk); 1104 1105 void ip6_flush_pending_frames(struct sock *sk); 1106 1107 int ip6_send_skb(struct sk_buff *skb); 1108 1109 struct sk_buff *__ip6_make_skb(struct sock *sk, struct sk_buff_head *queue, 1110 struct inet_cork_full *cork, 1111 struct inet6_cork *v6_cork); 1112 struct sk_buff *ip6_make_skb(struct sock *sk, 1113 int getfrag(void *from, char *to, int offset, 1114 int len, int odd, struct sk_buff *skb), 1115 void *from, size_t length, int transhdrlen, 1116 struct ipcm6_cookie *ipc6, 1117 struct rt6_info *rt, unsigned int flags, 1118 struct inet_cork_full *cork); 1119 ip6_finish_skb(struct sock * sk)1120 static inline struct sk_buff *ip6_finish_skb(struct sock *sk) 1121 { 1122 return __ip6_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork, 1123 &inet6_sk(sk)->cork); 1124 } 1125 1126 int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst, 1127 struct flowi6 *fl6); 1128 struct dst_entry *ip6_dst_lookup_flow(struct net *net, const struct sock *sk, struct flowi6 *fl6, 1129 const struct in6_addr *final_dst); 1130 struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6, 1131 const struct in6_addr *final_dst, 1132 bool connected); 1133 struct dst_entry *ip6_blackhole_route(struct net *net, 1134 struct dst_entry *orig_dst); 1135 1136 /* 1137 * skb processing functions 1138 */ 1139 1140 int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb); 1141 int ip6_forward(struct sk_buff *skb); 1142 int ip6_input(struct sk_buff *skb); 1143 int ip6_mc_input(struct sk_buff *skb); 1144 void ip6_protocol_deliver_rcu(struct net *net, struct sk_buff *skb, int nexthdr, 1145 bool have_final); 1146 1147 int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); 1148 int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); 1149 1150 /* 1151 * Extension header (options) processing 1152 */ 1153 1154 void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, 1155 u8 *proto, struct in6_addr **daddr_p, 1156 struct in6_addr *saddr); 1157 void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, 1158 u8 *proto); 1159 1160 int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp, 1161 __be16 *frag_offp); 1162 1163 bool ipv6_ext_hdr(u8 nexthdr); 1164 1165 enum { 1166 IP6_FH_F_FRAG = (1 << 0), 1167 IP6_FH_F_AUTH = (1 << 1), 1168 IP6_FH_F_SKIP_RH = (1 << 2), 1169 }; 1170 1171 /* find specified header and get offset to it */ 1172 int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target, 1173 unsigned short *fragoff, int *fragflg); 1174 1175 int ipv6_find_tlv(const struct sk_buff *skb, int offset, int type); 1176 1177 struct in6_addr *fl6_update_dst(struct flowi6 *fl6, 1178 const struct ipv6_txoptions *opt, 1179 struct in6_addr *orig); 1180 1181 /* 1182 * socket options (ipv6_sockglue.c) 1183 */ 1184 DECLARE_STATIC_KEY_FALSE(ip6_min_hopcount); 1185 1186 int do_ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, 1187 unsigned int optlen); 1188 int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, 1189 unsigned int optlen); 1190 int do_ipv6_getsockopt(struct sock *sk, int level, int optname, 1191 sockptr_t optval, sockptr_t optlen); 1192 int ipv6_getsockopt(struct sock *sk, int level, int optname, 1193 char __user *optval, int __user *optlen); 1194 1195 int __ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, 1196 int addr_len); 1197 int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len); 1198 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr, 1199 int addr_len); 1200 int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr); 1201 void ip6_datagram_release_cb(struct sock *sk); 1202 1203 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, 1204 int *addr_len); 1205 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len, 1206 int *addr_len); 1207 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, 1208 u32 info, u8 *payload); 1209 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info); 1210 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu); 1211 1212 void inet6_cleanup_sock(struct sock *sk); 1213 void inet6_sock_destruct(struct sock *sk); 1214 int inet6_release(struct socket *sock); 1215 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len); 1216 int inet6_bind_sk(struct sock *sk, struct sockaddr *uaddr, int addr_len); 1217 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 1218 int peer); 1219 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg); 1220 int inet6_compat_ioctl(struct socket *sock, unsigned int cmd, 1221 unsigned long arg); 1222 1223 int inet6_hash_connect(struct inet_timewait_death_row *death_row, 1224 struct sock *sk); 1225 int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size); 1226 int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 1227 int flags); 1228 1229 /* 1230 * reassembly.c 1231 */ 1232 extern const struct proto_ops inet6_stream_ops; 1233 extern const struct proto_ops inet6_dgram_ops; 1234 extern const struct proto_ops inet6_sockraw_ops; 1235 1236 struct group_source_req; 1237 struct group_filter; 1238 1239 int ip6_mc_source(int add, int omode, struct sock *sk, 1240 struct group_source_req *pgsr); 1241 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf, 1242 struct sockaddr_storage *list); 1243 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 1244 sockptr_t optval, size_t ss_offset); 1245 1246 #ifdef CONFIG_PROC_FS 1247 int ac6_proc_init(struct net *net); 1248 void ac6_proc_exit(struct net *net); 1249 int raw6_proc_init(void); 1250 void raw6_proc_exit(void); 1251 int tcp6_proc_init(struct net *net); 1252 void tcp6_proc_exit(struct net *net); 1253 int udp6_proc_init(struct net *net); 1254 void udp6_proc_exit(struct net *net); 1255 int udplite6_proc_init(void); 1256 void udplite6_proc_exit(void); 1257 int ipv6_misc_proc_init(void); 1258 void ipv6_misc_proc_exit(void); 1259 int snmp6_register_dev(struct inet6_dev *idev); 1260 int snmp6_unregister_dev(struct inet6_dev *idev); 1261 1262 #else ac6_proc_init(struct net * net)1263 static inline int ac6_proc_init(struct net *net) { return 0; } ac6_proc_exit(struct net * net)1264 static inline void ac6_proc_exit(struct net *net) { } snmp6_register_dev(struct inet6_dev * idev)1265 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; } snmp6_unregister_dev(struct inet6_dev * idev)1266 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; } 1267 #endif 1268 1269 #ifdef CONFIG_SYSCTL 1270 struct ctl_table *ipv6_icmp_sysctl_init(struct net *net); 1271 size_t ipv6_icmp_sysctl_table_size(void); 1272 struct ctl_table *ipv6_route_sysctl_init(struct net *net); 1273 size_t ipv6_route_sysctl_table_size(struct net *net); 1274 int ipv6_sysctl_register(void); 1275 void ipv6_sysctl_unregister(void); 1276 #endif 1277 1278 int ipv6_sock_mc_join(struct sock *sk, int ifindex, 1279 const struct in6_addr *addr); 1280 int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex, 1281 const struct in6_addr *addr, unsigned int mode); 1282 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, 1283 const struct in6_addr *addr); 1284 ip6_sock_set_v6only(struct sock * sk)1285 static inline int ip6_sock_set_v6only(struct sock *sk) 1286 { 1287 if (inet_sk(sk)->inet_num) 1288 return -EINVAL; 1289 lock_sock(sk); 1290 sk->sk_ipv6only = true; 1291 release_sock(sk); 1292 return 0; 1293 } 1294 ip6_sock_set_recverr(struct sock * sk)1295 static inline void ip6_sock_set_recverr(struct sock *sk) 1296 { 1297 inet6_set_bit(RECVERR6, sk); 1298 } 1299 1300 #define IPV6_PREFER_SRC_MASK (IPV6_PREFER_SRC_TMP | IPV6_PREFER_SRC_PUBLIC | \ 1301 IPV6_PREFER_SRC_COA) 1302 ip6_sock_set_addr_preferences(struct sock * sk,int val)1303 static inline int ip6_sock_set_addr_preferences(struct sock *sk, int val) 1304 { 1305 unsigned int prefmask = ~IPV6_PREFER_SRC_MASK; 1306 unsigned int pref = 0; 1307 1308 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */ 1309 switch (val & (IPV6_PREFER_SRC_PUBLIC | 1310 IPV6_PREFER_SRC_TMP | 1311 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) { 1312 case IPV6_PREFER_SRC_PUBLIC: 1313 pref |= IPV6_PREFER_SRC_PUBLIC; 1314 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC | 1315 IPV6_PREFER_SRC_TMP); 1316 break; 1317 case IPV6_PREFER_SRC_TMP: 1318 pref |= IPV6_PREFER_SRC_TMP; 1319 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC | 1320 IPV6_PREFER_SRC_TMP); 1321 break; 1322 case IPV6_PREFER_SRC_PUBTMP_DEFAULT: 1323 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC | 1324 IPV6_PREFER_SRC_TMP); 1325 break; 1326 case 0: 1327 break; 1328 default: 1329 return -EINVAL; 1330 } 1331 1332 /* check HOME/COA conflicts */ 1333 switch (val & (IPV6_PREFER_SRC_HOME | IPV6_PREFER_SRC_COA)) { 1334 case IPV6_PREFER_SRC_HOME: 1335 prefmask &= ~IPV6_PREFER_SRC_COA; 1336 break; 1337 case IPV6_PREFER_SRC_COA: 1338 pref |= IPV6_PREFER_SRC_COA; 1339 break; 1340 case 0: 1341 break; 1342 default: 1343 return -EINVAL; 1344 } 1345 1346 /* check CGA/NONCGA conflicts */ 1347 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) { 1348 case IPV6_PREFER_SRC_CGA: 1349 case IPV6_PREFER_SRC_NONCGA: 1350 case 0: 1351 break; 1352 default: 1353 return -EINVAL; 1354 } 1355 1356 WRITE_ONCE(inet6_sk(sk)->srcprefs, 1357 (READ_ONCE(inet6_sk(sk)->srcprefs) & prefmask) | pref); 1358 return 0; 1359 } 1360 ip6_sock_set_recvpktinfo(struct sock * sk)1361 static inline void ip6_sock_set_recvpktinfo(struct sock *sk) 1362 { 1363 lock_sock(sk); 1364 inet6_sk(sk)->rxopt.bits.rxinfo = true; 1365 release_sock(sk); 1366 } 1367 1368 #define IPV6_ADDR_WORDS 4 1369 ipv6_addr_cpu_to_be32(__be32 * dst,const u32 * src)1370 static inline void ipv6_addr_cpu_to_be32(__be32 *dst, const u32 *src) 1371 { 1372 cpu_to_be32_array(dst, src, IPV6_ADDR_WORDS); 1373 } 1374 ipv6_addr_be32_to_cpu(u32 * dst,const __be32 * src)1375 static inline void ipv6_addr_be32_to_cpu(u32 *dst, const __be32 *src) 1376 { 1377 be32_to_cpu_array(dst, src, IPV6_ADDR_WORDS); 1378 } 1379 1380 #endif /* _NET_IPV6_H */ 1381