1 /* 2 * Linux INET6 implementation 3 * 4 * Authors: 5 * Pedro Roque <roque@di.fc.ul.pt> 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License 9 * as published by the Free Software Foundation; either version 10 * 2 of the License, or (at your option) any later version. 11 */ 12 13 #ifndef _NET_IPV6_H 14 #define _NET_IPV6_H 15 16 #include <linux/ipv6.h> 17 #include <linux/hardirq.h> 18 #include <net/if_inet6.h> 19 #include <net/ndisc.h> 20 #include <net/flow.h> 21 #include <net/snmp.h> 22 23 #define SIN6_LEN_RFC2133 24 24 25 #define IPV6_MAXPLEN 65535 26 27 /* 28 * NextHeader field of IPv6 header 29 */ 30 31 #define NEXTHDR_HOP 0 /* Hop-by-hop option header. */ 32 #define NEXTHDR_TCP 6 /* TCP segment. */ 33 #define NEXTHDR_UDP 17 /* UDP message. */ 34 #define NEXTHDR_IPV6 41 /* IPv6 in IPv6 */ 35 #define NEXTHDR_ROUTING 43 /* Routing header. */ 36 #define NEXTHDR_FRAGMENT 44 /* Fragmentation/reassembly header. */ 37 #define NEXTHDR_GRE 47 /* GRE header. */ 38 #define NEXTHDR_ESP 50 /* Encapsulating security payload. */ 39 #define NEXTHDR_AUTH 51 /* Authentication header. */ 40 #define NEXTHDR_ICMP 58 /* ICMP for IPv6. */ 41 #define NEXTHDR_NONE 59 /* No next header */ 42 #define NEXTHDR_DEST 60 /* Destination options header. */ 43 #define NEXTHDR_MOBILITY 135 /* Mobility header. */ 44 45 #define NEXTHDR_MAX 255 46 47 48 49 #define IPV6_DEFAULT_HOPLIMIT 64 50 #define IPV6_DEFAULT_MCASTHOPS 1 51 52 /* 53 * Addr type 54 * 55 * type - unicast | multicast 56 * scope - local | site | global 57 * v4 - compat 58 * v4mapped 59 * any 60 * loopback 61 */ 62 63 #define IPV6_ADDR_ANY 0x0000U 64 65 #define IPV6_ADDR_UNICAST 0x0001U 66 #define IPV6_ADDR_MULTICAST 0x0002U 67 68 #define IPV6_ADDR_LOOPBACK 0x0010U 69 #define IPV6_ADDR_LINKLOCAL 0x0020U 70 #define IPV6_ADDR_SITELOCAL 0x0040U 71 72 #define IPV6_ADDR_COMPATv4 0x0080U 73 74 #define IPV6_ADDR_SCOPE_MASK 0x00f0U 75 76 #define IPV6_ADDR_MAPPED 0x1000U 77 78 /* 79 * Addr scopes 80 */ 81 #define IPV6_ADDR_MC_SCOPE(a) \ 82 ((a)->s6_addr[1] & 0x0f) /* nonstandard */ 83 #define __IPV6_ADDR_SCOPE_INVALID -1 84 #define IPV6_ADDR_SCOPE_NODELOCAL 0x01 85 #define IPV6_ADDR_SCOPE_LINKLOCAL 0x02 86 #define IPV6_ADDR_SCOPE_SITELOCAL 0x05 87 #define IPV6_ADDR_SCOPE_ORGLOCAL 0x08 88 #define IPV6_ADDR_SCOPE_GLOBAL 0x0e 89 90 /* 91 * Addr flags 92 */ 93 #define IPV6_ADDR_MC_FLAG_TRANSIENT(a) \ 94 ((a)->s6_addr[1] & 0x10) 95 #define IPV6_ADDR_MC_FLAG_PREFIX(a) \ 96 ((a)->s6_addr[1] & 0x20) 97 #define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \ 98 ((a)->s6_addr[1] & 0x40) 99 100 /* 101 * fragmentation header 102 */ 103 104 struct frag_hdr { 105 __u8 nexthdr; 106 __u8 reserved; 107 __be16 frag_off; 108 __be32 identification; 109 }; 110 111 #define IP6_MF 0x0001 112 113 #include <net/sock.h> 114 115 /* sysctls */ 116 extern int sysctl_mld_max_msf; 117 118 #define _DEVINC(net, statname, modifier, idev, field) \ 119 ({ \ 120 struct inet6_dev *_idev = (idev); \ 121 if (likely(_idev != NULL)) \ 122 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \ 123 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\ 124 }) 125 126 /* per device counters are atomic_long_t */ 127 #define _DEVINCATOMIC(net, statname, modifier, idev, field) \ 128 ({ \ 129 struct inet6_dev *_idev = (idev); \ 130 if (likely(_idev != NULL)) \ 131 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \ 132 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\ 133 }) 134 135 /* per device and per net counters are atomic_long_t */ 136 #define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \ 137 ({ \ 138 struct inet6_dev *_idev = (idev); \ 139 if (likely(_idev != NULL)) \ 140 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \ 141 SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\ 142 }) 143 144 #define _DEVADD(net, statname, modifier, idev, field, val) \ 145 ({ \ 146 struct inet6_dev *_idev = (idev); \ 147 if (likely(_idev != NULL)) \ 148 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \ 149 SNMP_ADD_STATS##modifier((net)->mib.statname##_statistics, (field), (val));\ 150 }) 151 152 #define _DEVUPD(net, statname, modifier, idev, field, val) \ 153 ({ \ 154 struct inet6_dev *_idev = (idev); \ 155 if (likely(_idev != NULL)) \ 156 SNMP_UPD_PO_STATS##modifier((_idev)->stats.statname, field, (val)); \ 157 SNMP_UPD_PO_STATS##modifier((net)->mib.statname##_statistics, field, (val));\ 158 }) 159 160 /* MIBs */ 161 162 #define IP6_INC_STATS(net, idev,field) \ 163 _DEVINC(net, ipv6, 64, idev, field) 164 #define IP6_INC_STATS_BH(net, idev,field) \ 165 _DEVINC(net, ipv6, 64_BH, idev, field) 166 #define IP6_ADD_STATS(net, idev,field,val) \ 167 _DEVADD(net, ipv6, 64, idev, field, val) 168 #define IP6_ADD_STATS_BH(net, idev,field,val) \ 169 _DEVADD(net, ipv6, 64_BH, idev, field, val) 170 #define IP6_UPD_PO_STATS(net, idev,field,val) \ 171 _DEVUPD(net, ipv6, 64, idev, field, val) 172 #define IP6_UPD_PO_STATS_BH(net, idev,field,val) \ 173 _DEVUPD(net, ipv6, 64_BH, idev, field, val) 174 #define ICMP6_INC_STATS(net, idev, field) \ 175 _DEVINCATOMIC(net, icmpv6, , idev, field) 176 #define ICMP6_INC_STATS_BH(net, idev, field) \ 177 _DEVINCATOMIC(net, icmpv6, _BH, idev, field) 178 179 #define ICMP6MSGOUT_INC_STATS(net, idev, field) \ 180 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256) 181 #define ICMP6MSGOUT_INC_STATS_BH(net, idev, field) \ 182 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256) 183 #define ICMP6MSGIN_INC_STATS_BH(net, idev, field) \ 184 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field) 185 186 struct ip6_ra_chain { 187 struct ip6_ra_chain *next; 188 struct sock *sk; 189 int sel; 190 void (*destructor)(struct sock *); 191 }; 192 193 extern struct ip6_ra_chain *ip6_ra_chain; 194 extern rwlock_t ip6_ra_lock; 195 196 /* 197 This structure is prepared by protocol, when parsing 198 ancillary data and passed to IPv6. 199 */ 200 201 struct ipv6_txoptions { 202 /* Length of this structure */ 203 int tot_len; 204 205 /* length of extension headers */ 206 207 __u16 opt_flen; /* after fragment hdr */ 208 __u16 opt_nflen; /* before fragment hdr */ 209 210 struct ipv6_opt_hdr *hopopt; 211 struct ipv6_opt_hdr *dst0opt; 212 struct ipv6_rt_hdr *srcrt; /* Routing Header */ 213 struct ipv6_opt_hdr *dst1opt; 214 215 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */ 216 }; 217 218 struct ip6_flowlabel { 219 struct ip6_flowlabel *next; 220 __be32 label; 221 atomic_t users; 222 struct in6_addr dst; 223 struct ipv6_txoptions *opt; 224 unsigned long linger; 225 u8 share; 226 union { 227 struct pid *pid; 228 kuid_t uid; 229 } owner; 230 unsigned long lastuse; 231 unsigned long expires; 232 struct net *fl_net; 233 }; 234 235 #define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF) 236 #define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF) 237 238 struct ipv6_fl_socklist { 239 struct ipv6_fl_socklist *next; 240 struct ip6_flowlabel *fl; 241 }; 242 243 extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label); 244 extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space, 245 struct ip6_flowlabel * fl, 246 struct ipv6_txoptions * fopt); 247 extern void fl6_free_socklist(struct sock *sk); 248 extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen); 249 extern int ip6_flowlabel_init(void); 250 extern void ip6_flowlabel_cleanup(void); 251 252 static inline void fl6_sock_release(struct ip6_flowlabel *fl) 253 { 254 if (fl) 255 atomic_dec(&fl->users); 256 } 257 258 extern void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info); 259 260 extern int ip6_ra_control(struct sock *sk, int sel); 261 262 extern int ipv6_parse_hopopts(struct sk_buff *skb); 263 264 extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt); 265 extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt, 266 int newtype, 267 struct ipv6_opt_hdr __user *newopt, 268 int newoptlen); 269 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space, 270 struct ipv6_txoptions *opt); 271 272 extern bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb); 273 274 static inline bool ipv6_accept_ra(struct inet6_dev *idev) 275 { 276 /* If forwarding is enabled, RA are not accepted unless the special 277 * hybrid mode (accept_ra=2) is enabled. 278 */ 279 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 : 280 idev->cnf.accept_ra; 281 } 282 283 #if IS_ENABLED(CONFIG_IPV6) 284 static inline int ip6_frag_nqueues(struct net *net) 285 { 286 return net->ipv6.frags.nqueues; 287 } 288 289 static inline int ip6_frag_mem(struct net *net) 290 { 291 return atomic_read(&net->ipv6.frags.mem); 292 } 293 #endif 294 295 #define IPV6_FRAG_HIGH_THRESH (256 * 1024) /* 262144 */ 296 #define IPV6_FRAG_LOW_THRESH (192 * 1024) /* 196608 */ 297 #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */ 298 299 extern int __ipv6_addr_type(const struct in6_addr *addr); 300 static inline int ipv6_addr_type(const struct in6_addr *addr) 301 { 302 return __ipv6_addr_type(addr) & 0xffff; 303 } 304 305 static inline int ipv6_addr_scope(const struct in6_addr *addr) 306 { 307 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK; 308 } 309 310 static inline int __ipv6_addr_src_scope(int type) 311 { 312 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16); 313 } 314 315 static inline int ipv6_addr_src_scope(const struct in6_addr *addr) 316 { 317 return __ipv6_addr_src_scope(__ipv6_addr_type(addr)); 318 } 319 320 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2) 321 { 322 return memcmp(a1, a2, sizeof(struct in6_addr)); 323 } 324 325 static inline bool 326 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m, 327 const struct in6_addr *a2) 328 { 329 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 330 const unsigned long *ul1 = (const unsigned long *)a1; 331 const unsigned long *ulm = (const unsigned long *)m; 332 const unsigned long *ul2 = (const unsigned long *)a2; 333 334 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) | 335 ((ul1[1] ^ ul2[1]) & ulm[1])); 336 #else 337 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) | 338 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) | 339 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) | 340 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3])); 341 #endif 342 } 343 344 static inline void ipv6_addr_prefix(struct in6_addr *pfx, 345 const struct in6_addr *addr, 346 int plen) 347 { 348 /* caller must guarantee 0 <= plen <= 128 */ 349 int o = plen >> 3, 350 b = plen & 0x7; 351 352 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr)); 353 memcpy(pfx->s6_addr, addr, o); 354 if (b != 0) 355 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b); 356 } 357 358 static inline void ipv6_addr_set(struct in6_addr *addr, 359 __be32 w1, __be32 w2, 360 __be32 w3, __be32 w4) 361 { 362 addr->s6_addr32[0] = w1; 363 addr->s6_addr32[1] = w2; 364 addr->s6_addr32[2] = w3; 365 addr->s6_addr32[3] = w4; 366 } 367 368 static inline bool ipv6_addr_equal(const struct in6_addr *a1, 369 const struct in6_addr *a2) 370 { 371 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 372 const unsigned long *ul1 = (const unsigned long *)a1; 373 const unsigned long *ul2 = (const unsigned long *)a2; 374 375 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL; 376 #else 377 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) | 378 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) | 379 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) | 380 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0; 381 #endif 382 } 383 384 static inline bool __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2, 385 unsigned int prefixlen) 386 { 387 unsigned int pdw, pbi; 388 389 /* check complete u32 in prefix */ 390 pdw = prefixlen >> 5; 391 if (pdw && memcmp(a1, a2, pdw << 2)) 392 return false; 393 394 /* check incomplete u32 in prefix */ 395 pbi = prefixlen & 0x1f; 396 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi)))) 397 return false; 398 399 return true; 400 } 401 402 static inline bool ipv6_prefix_equal(const struct in6_addr *a1, 403 const struct in6_addr *a2, 404 unsigned int prefixlen) 405 { 406 return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32, 407 prefixlen); 408 } 409 410 struct inet_frag_queue; 411 412 enum ip6_defrag_users { 413 IP6_DEFRAG_LOCAL_DELIVER, 414 IP6_DEFRAG_CONNTRACK_IN, 415 __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX, 416 IP6_DEFRAG_CONNTRACK_OUT, 417 __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX, 418 IP6_DEFRAG_CONNTRACK_BRIDGE_IN, 419 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX, 420 }; 421 422 struct ip6_create_arg { 423 __be32 id; 424 u32 user; 425 const struct in6_addr *src; 426 const struct in6_addr *dst; 427 }; 428 429 void ip6_frag_init(struct inet_frag_queue *q, void *a); 430 bool ip6_frag_match(struct inet_frag_queue *q, void *a); 431 432 /* 433 * Equivalent of ipv4 struct ip 434 */ 435 struct frag_queue { 436 struct inet_frag_queue q; 437 438 __be32 id; /* fragment id */ 439 u32 user; 440 struct in6_addr saddr; 441 struct in6_addr daddr; 442 443 int iif; 444 unsigned int csum; 445 __u16 nhoffset; 446 }; 447 448 void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq, 449 struct inet_frags *frags); 450 451 static inline bool ipv6_addr_any(const struct in6_addr *a) 452 { 453 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 454 const unsigned long *ul = (const unsigned long *)a; 455 456 return (ul[0] | ul[1]) == 0UL; 457 #else 458 return (a->s6_addr32[0] | a->s6_addr32[1] | 459 a->s6_addr32[2] | a->s6_addr32[3]) == 0; 460 #endif 461 } 462 463 static inline u32 ipv6_addr_hash(const struct in6_addr *a) 464 { 465 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 466 const unsigned long *ul = (const unsigned long *)a; 467 unsigned long x = ul[0] ^ ul[1]; 468 469 return (u32)(x ^ (x >> 32)); 470 #else 471 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^ 472 a->s6_addr32[2] ^ a->s6_addr32[3]); 473 #endif 474 } 475 476 static inline bool ipv6_addr_loopback(const struct in6_addr *a) 477 { 478 return (a->s6_addr32[0] | a->s6_addr32[1] | 479 a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0; 480 } 481 482 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a) 483 { 484 return (a->s6_addr32[0] | a->s6_addr32[1] | 485 (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0; 486 } 487 488 /* 489 * Check for a RFC 4843 ORCHID address 490 * (Overlay Routable Cryptographic Hash Identifiers) 491 */ 492 static inline bool ipv6_addr_orchid(const struct in6_addr *a) 493 { 494 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010); 495 } 496 497 static inline void ipv6_addr_set_v4mapped(const __be32 addr, 498 struct in6_addr *v4mapped) 499 { 500 ipv6_addr_set(v4mapped, 501 0, 0, 502 htonl(0x0000FFFF), 503 addr); 504 } 505 506 /* 507 * find the first different bit between two addresses 508 * length of address must be a multiple of 32bits 509 */ 510 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen) 511 { 512 const __be32 *a1 = token1, *a2 = token2; 513 int i; 514 515 addrlen >>= 2; 516 517 for (i = 0; i < addrlen; i++) { 518 __be32 xb = a1[i] ^ a2[i]; 519 if (xb) 520 return i * 32 + 31 - __fls(ntohl(xb)); 521 } 522 523 /* 524 * we should *never* get to this point since that 525 * would mean the addrs are equal 526 * 527 * However, we do get to it 8) And exacly, when 528 * addresses are equal 8) 529 * 530 * ip route add 1111::/128 via ... 531 * ip route add 1111::/64 via ... 532 * and we are here. 533 * 534 * Ideally, this function should stop comparison 535 * at prefix length. It does not, but it is still OK, 536 * if returned value is greater than prefix length. 537 * --ANK (980803) 538 */ 539 return addrlen << 5; 540 } 541 542 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2) 543 { 544 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr)); 545 } 546 547 extern void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt); 548 549 /* 550 * Prototypes exported by ipv6 551 */ 552 553 /* 554 * rcv function (called from netdevice level) 555 */ 556 557 extern int ipv6_rcv(struct sk_buff *skb, 558 struct net_device *dev, 559 struct packet_type *pt, 560 struct net_device *orig_dev); 561 562 extern int ip6_rcv_finish(struct sk_buff *skb); 563 564 /* 565 * upper-layer output functions 566 */ 567 extern int ip6_xmit(struct sock *sk, 568 struct sk_buff *skb, 569 struct flowi6 *fl6, 570 struct ipv6_txoptions *opt, 571 int tclass); 572 573 extern int ip6_nd_hdr(struct sock *sk, 574 struct sk_buff *skb, 575 struct net_device *dev, 576 const struct in6_addr *saddr, 577 const struct in6_addr *daddr, 578 int proto, int len); 579 580 extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr); 581 582 extern int ip6_append_data(struct sock *sk, 583 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb), 584 void *from, 585 int length, 586 int transhdrlen, 587 int hlimit, 588 int tclass, 589 struct ipv6_txoptions *opt, 590 struct flowi6 *fl6, 591 struct rt6_info *rt, 592 unsigned int flags, 593 int dontfrag); 594 595 extern int ip6_push_pending_frames(struct sock *sk); 596 597 extern void ip6_flush_pending_frames(struct sock *sk); 598 599 extern int ip6_dst_lookup(struct sock *sk, 600 struct dst_entry **dst, 601 struct flowi6 *fl6); 602 extern struct dst_entry * ip6_dst_lookup_flow(struct sock *sk, 603 struct flowi6 *fl6, 604 const struct in6_addr *final_dst, 605 bool can_sleep); 606 extern struct dst_entry * ip6_sk_dst_lookup_flow(struct sock *sk, 607 struct flowi6 *fl6, 608 const struct in6_addr *final_dst, 609 bool can_sleep); 610 extern struct dst_entry * ip6_blackhole_route(struct net *net, 611 struct dst_entry *orig_dst); 612 613 /* 614 * skb processing functions 615 */ 616 617 extern int ip6_output(struct sk_buff *skb); 618 extern int ip6_forward(struct sk_buff *skb); 619 extern int ip6_input(struct sk_buff *skb); 620 extern int ip6_mc_input(struct sk_buff *skb); 621 622 extern int __ip6_local_out(struct sk_buff *skb); 623 extern int ip6_local_out(struct sk_buff *skb); 624 625 /* 626 * Extension header (options) processing 627 */ 628 629 extern void ipv6_push_nfrag_opts(struct sk_buff *skb, 630 struct ipv6_txoptions *opt, 631 u8 *proto, 632 struct in6_addr **daddr_p); 633 extern void ipv6_push_frag_opts(struct sk_buff *skb, 634 struct ipv6_txoptions *opt, 635 u8 *proto); 636 637 extern int ipv6_skip_exthdr(const struct sk_buff *, int start, 638 u8 *nexthdrp, __be16 *frag_offp); 639 640 extern bool ipv6_ext_hdr(u8 nexthdr); 641 642 enum { 643 IP6_FH_F_FRAG = (1 << 0), 644 IP6_FH_F_AUTH = (1 << 1), 645 IP6_FH_F_SKIP_RH = (1 << 2), 646 }; 647 648 /* find specified header and get offset to it */ 649 extern int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, 650 int target, unsigned short *fragoff, int *fragflg); 651 652 extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type); 653 654 extern struct in6_addr *fl6_update_dst(struct flowi6 *fl6, 655 const struct ipv6_txoptions *opt, 656 struct in6_addr *orig); 657 658 /* 659 * socket options (ipv6_sockglue.c) 660 */ 661 662 extern int ipv6_setsockopt(struct sock *sk, int level, 663 int optname, 664 char __user *optval, 665 unsigned int optlen); 666 extern int ipv6_getsockopt(struct sock *sk, int level, 667 int optname, 668 char __user *optval, 669 int __user *optlen); 670 extern int compat_ipv6_setsockopt(struct sock *sk, 671 int level, 672 int optname, 673 char __user *optval, 674 unsigned int optlen); 675 extern int compat_ipv6_getsockopt(struct sock *sk, 676 int level, 677 int optname, 678 char __user *optval, 679 int __user *optlen); 680 681 extern int ip6_datagram_connect(struct sock *sk, 682 struct sockaddr *addr, int addr_len); 683 684 extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len); 685 extern int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len); 686 extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, 687 u32 info, u8 *payload); 688 extern void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info); 689 extern void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu); 690 691 extern int inet6_release(struct socket *sock); 692 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr, 693 int addr_len); 694 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 695 int *uaddr_len, int peer); 696 extern int inet6_ioctl(struct socket *sock, unsigned int cmd, 697 unsigned long arg); 698 699 extern int inet6_hash_connect(struct inet_timewait_death_row *death_row, 700 struct sock *sk); 701 702 /* 703 * reassembly.c 704 */ 705 extern const struct proto_ops inet6_stream_ops; 706 extern const struct proto_ops inet6_dgram_ops; 707 708 struct group_source_req; 709 struct group_filter; 710 711 extern int ip6_mc_source(int add, int omode, struct sock *sk, 712 struct group_source_req *pgsr); 713 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf); 714 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 715 struct group_filter __user *optval, 716 int __user *optlen); 717 extern unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr, 718 const struct in6_addr *daddr, u32 rnd); 719 720 #ifdef CONFIG_PROC_FS 721 extern int ac6_proc_init(struct net *net); 722 extern void ac6_proc_exit(struct net *net); 723 extern int raw6_proc_init(void); 724 extern void raw6_proc_exit(void); 725 extern int tcp6_proc_init(struct net *net); 726 extern void tcp6_proc_exit(struct net *net); 727 extern int udp6_proc_init(struct net *net); 728 extern void udp6_proc_exit(struct net *net); 729 extern int udplite6_proc_init(void); 730 extern void udplite6_proc_exit(void); 731 extern int ipv6_misc_proc_init(void); 732 extern void ipv6_misc_proc_exit(void); 733 extern int snmp6_register_dev(struct inet6_dev *idev); 734 extern int snmp6_unregister_dev(struct inet6_dev *idev); 735 736 #else 737 static inline int ac6_proc_init(struct net *net) { return 0; } 738 static inline void ac6_proc_exit(struct net *net) { } 739 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; } 740 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; } 741 #endif 742 743 #ifdef CONFIG_SYSCTL 744 extern ctl_table ipv6_route_table_template[]; 745 extern ctl_table ipv6_icmp_table_template[]; 746 747 extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net); 748 extern struct ctl_table *ipv6_route_sysctl_init(struct net *net); 749 extern int ipv6_sysctl_register(void); 750 extern void ipv6_sysctl_unregister(void); 751 #endif 752 753 #endif /* _NET_IPV6_H */ 754