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 #if IS_ENABLED(CONFIG_IPV6) 275 static inline int ip6_frag_nqueues(struct net *net) 276 { 277 return net->ipv6.frags.nqueues; 278 } 279 280 static inline int ip6_frag_mem(struct net *net) 281 { 282 return atomic_read(&net->ipv6.frags.mem); 283 } 284 #endif 285 286 #define IPV6_FRAG_HIGH_THRESH (256 * 1024) /* 262144 */ 287 #define IPV6_FRAG_LOW_THRESH (192 * 1024) /* 196608 */ 288 #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */ 289 290 extern int __ipv6_addr_type(const struct in6_addr *addr); 291 static inline int ipv6_addr_type(const struct in6_addr *addr) 292 { 293 return __ipv6_addr_type(addr) & 0xffff; 294 } 295 296 static inline int ipv6_addr_scope(const struct in6_addr *addr) 297 { 298 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK; 299 } 300 301 static inline int __ipv6_addr_src_scope(int type) 302 { 303 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16); 304 } 305 306 static inline int ipv6_addr_src_scope(const struct in6_addr *addr) 307 { 308 return __ipv6_addr_src_scope(__ipv6_addr_type(addr)); 309 } 310 311 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2) 312 { 313 return memcmp(a1, a2, sizeof(struct in6_addr)); 314 } 315 316 static inline bool 317 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m, 318 const struct in6_addr *a2) 319 { 320 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 321 const unsigned long *ul1 = (const unsigned long *)a1; 322 const unsigned long *ulm = (const unsigned long *)m; 323 const unsigned long *ul2 = (const unsigned long *)a2; 324 325 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) | 326 ((ul1[1] ^ ul2[1]) & ulm[1])); 327 #else 328 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) | 329 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) | 330 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) | 331 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3])); 332 #endif 333 } 334 335 static inline void ipv6_addr_prefix(struct in6_addr *pfx, 336 const struct in6_addr *addr, 337 int plen) 338 { 339 /* caller must guarantee 0 <= plen <= 128 */ 340 int o = plen >> 3, 341 b = plen & 0x7; 342 343 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr)); 344 memcpy(pfx->s6_addr, addr, o); 345 if (b != 0) 346 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b); 347 } 348 349 static inline void ipv6_addr_set(struct in6_addr *addr, 350 __be32 w1, __be32 w2, 351 __be32 w3, __be32 w4) 352 { 353 addr->s6_addr32[0] = w1; 354 addr->s6_addr32[1] = w2; 355 addr->s6_addr32[2] = w3; 356 addr->s6_addr32[3] = w4; 357 } 358 359 static inline bool ipv6_addr_equal(const struct in6_addr *a1, 360 const struct in6_addr *a2) 361 { 362 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 363 const unsigned long *ul1 = (const unsigned long *)a1; 364 const unsigned long *ul2 = (const unsigned long *)a2; 365 366 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL; 367 #else 368 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) | 369 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) | 370 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) | 371 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0; 372 #endif 373 } 374 375 static inline bool __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2, 376 unsigned int prefixlen) 377 { 378 unsigned int pdw, pbi; 379 380 /* check complete u32 in prefix */ 381 pdw = prefixlen >> 5; 382 if (pdw && memcmp(a1, a2, pdw << 2)) 383 return false; 384 385 /* check incomplete u32 in prefix */ 386 pbi = prefixlen & 0x1f; 387 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi)))) 388 return false; 389 390 return true; 391 } 392 393 static inline bool ipv6_prefix_equal(const struct in6_addr *a1, 394 const struct in6_addr *a2, 395 unsigned int prefixlen) 396 { 397 return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32, 398 prefixlen); 399 } 400 401 struct inet_frag_queue; 402 403 enum ip6_defrag_users { 404 IP6_DEFRAG_LOCAL_DELIVER, 405 IP6_DEFRAG_CONNTRACK_IN, 406 __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX, 407 IP6_DEFRAG_CONNTRACK_OUT, 408 __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX, 409 IP6_DEFRAG_CONNTRACK_BRIDGE_IN, 410 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX, 411 }; 412 413 struct ip6_create_arg { 414 __be32 id; 415 u32 user; 416 const struct in6_addr *src; 417 const struct in6_addr *dst; 418 }; 419 420 void ip6_frag_init(struct inet_frag_queue *q, void *a); 421 bool ip6_frag_match(struct inet_frag_queue *q, void *a); 422 423 /* 424 * Equivalent of ipv4 struct ip 425 */ 426 struct frag_queue { 427 struct inet_frag_queue q; 428 429 __be32 id; /* fragment id */ 430 u32 user; 431 struct in6_addr saddr; 432 struct in6_addr daddr; 433 434 int iif; 435 unsigned int csum; 436 __u16 nhoffset; 437 }; 438 439 void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq, 440 struct inet_frags *frags); 441 442 static inline bool ipv6_addr_any(const struct in6_addr *a) 443 { 444 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 445 const unsigned long *ul = (const unsigned long *)a; 446 447 return (ul[0] | ul[1]) == 0UL; 448 #else 449 return (a->s6_addr32[0] | a->s6_addr32[1] | 450 a->s6_addr32[2] | a->s6_addr32[3]) == 0; 451 #endif 452 } 453 454 static inline u32 ipv6_addr_hash(const struct in6_addr *a) 455 { 456 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 457 const unsigned long *ul = (const unsigned long *)a; 458 unsigned long x = ul[0] ^ ul[1]; 459 460 return (u32)(x ^ (x >> 32)); 461 #else 462 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^ 463 a->s6_addr32[2] ^ a->s6_addr32[3]); 464 #endif 465 } 466 467 static inline bool ipv6_addr_loopback(const struct in6_addr *a) 468 { 469 return (a->s6_addr32[0] | a->s6_addr32[1] | 470 a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0; 471 } 472 473 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a) 474 { 475 return (a->s6_addr32[0] | a->s6_addr32[1] | 476 (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0; 477 } 478 479 /* 480 * Check for a RFC 4843 ORCHID address 481 * (Overlay Routable Cryptographic Hash Identifiers) 482 */ 483 static inline bool ipv6_addr_orchid(const struct in6_addr *a) 484 { 485 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010); 486 } 487 488 static inline void ipv6_addr_set_v4mapped(const __be32 addr, 489 struct in6_addr *v4mapped) 490 { 491 ipv6_addr_set(v4mapped, 492 0, 0, 493 htonl(0x0000FFFF), 494 addr); 495 } 496 497 /* 498 * find the first different bit between two addresses 499 * length of address must be a multiple of 32bits 500 */ 501 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen) 502 { 503 const __be32 *a1 = token1, *a2 = token2; 504 int i; 505 506 addrlen >>= 2; 507 508 for (i = 0; i < addrlen; i++) { 509 __be32 xb = a1[i] ^ a2[i]; 510 if (xb) 511 return i * 32 + 31 - __fls(ntohl(xb)); 512 } 513 514 /* 515 * we should *never* get to this point since that 516 * would mean the addrs are equal 517 * 518 * However, we do get to it 8) And exacly, when 519 * addresses are equal 8) 520 * 521 * ip route add 1111::/128 via ... 522 * ip route add 1111::/64 via ... 523 * and we are here. 524 * 525 * Ideally, this function should stop comparison 526 * at prefix length. It does not, but it is still OK, 527 * if returned value is greater than prefix length. 528 * --ANK (980803) 529 */ 530 return addrlen << 5; 531 } 532 533 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2) 534 { 535 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr)); 536 } 537 538 extern void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt); 539 540 /* 541 * Prototypes exported by ipv6 542 */ 543 544 /* 545 * rcv function (called from netdevice level) 546 */ 547 548 extern int ipv6_rcv(struct sk_buff *skb, 549 struct net_device *dev, 550 struct packet_type *pt, 551 struct net_device *orig_dev); 552 553 extern int ip6_rcv_finish(struct sk_buff *skb); 554 555 /* 556 * upper-layer output functions 557 */ 558 extern int ip6_xmit(struct sock *sk, 559 struct sk_buff *skb, 560 struct flowi6 *fl6, 561 struct ipv6_txoptions *opt, 562 int tclass); 563 564 extern int ip6_nd_hdr(struct sock *sk, 565 struct sk_buff *skb, 566 struct net_device *dev, 567 const struct in6_addr *saddr, 568 const struct in6_addr *daddr, 569 int proto, int len); 570 571 extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr); 572 573 extern int ip6_append_data(struct sock *sk, 574 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb), 575 void *from, 576 int length, 577 int transhdrlen, 578 int hlimit, 579 int tclass, 580 struct ipv6_txoptions *opt, 581 struct flowi6 *fl6, 582 struct rt6_info *rt, 583 unsigned int flags, 584 int dontfrag); 585 586 extern int ip6_push_pending_frames(struct sock *sk); 587 588 extern void ip6_flush_pending_frames(struct sock *sk); 589 590 extern int ip6_dst_lookup(struct sock *sk, 591 struct dst_entry **dst, 592 struct flowi6 *fl6); 593 extern struct dst_entry * ip6_dst_lookup_flow(struct sock *sk, 594 struct flowi6 *fl6, 595 const struct in6_addr *final_dst, 596 bool can_sleep); 597 extern struct dst_entry * ip6_sk_dst_lookup_flow(struct sock *sk, 598 struct flowi6 *fl6, 599 const struct in6_addr *final_dst, 600 bool can_sleep); 601 extern struct dst_entry * ip6_blackhole_route(struct net *net, 602 struct dst_entry *orig_dst); 603 604 /* 605 * skb processing functions 606 */ 607 608 extern int ip6_output(struct sk_buff *skb); 609 extern int ip6_forward(struct sk_buff *skb); 610 extern int ip6_input(struct sk_buff *skb); 611 extern int ip6_mc_input(struct sk_buff *skb); 612 613 extern int __ip6_local_out(struct sk_buff *skb); 614 extern int ip6_local_out(struct sk_buff *skb); 615 616 /* 617 * Extension header (options) processing 618 */ 619 620 extern void ipv6_push_nfrag_opts(struct sk_buff *skb, 621 struct ipv6_txoptions *opt, 622 u8 *proto, 623 struct in6_addr **daddr_p); 624 extern void ipv6_push_frag_opts(struct sk_buff *skb, 625 struct ipv6_txoptions *opt, 626 u8 *proto); 627 628 extern int ipv6_skip_exthdr(const struct sk_buff *, int start, 629 u8 *nexthdrp, __be16 *frag_offp); 630 631 extern bool ipv6_ext_hdr(u8 nexthdr); 632 633 extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type); 634 635 extern struct in6_addr *fl6_update_dst(struct flowi6 *fl6, 636 const struct ipv6_txoptions *opt, 637 struct in6_addr *orig); 638 639 /* 640 * socket options (ipv6_sockglue.c) 641 */ 642 643 extern int ipv6_setsockopt(struct sock *sk, int level, 644 int optname, 645 char __user *optval, 646 unsigned int optlen); 647 extern int ipv6_getsockopt(struct sock *sk, int level, 648 int optname, 649 char __user *optval, 650 int __user *optlen); 651 extern int compat_ipv6_setsockopt(struct sock *sk, 652 int level, 653 int optname, 654 char __user *optval, 655 unsigned int optlen); 656 extern int compat_ipv6_getsockopt(struct sock *sk, 657 int level, 658 int optname, 659 char __user *optval, 660 int __user *optlen); 661 662 extern int ip6_datagram_connect(struct sock *sk, 663 struct sockaddr *addr, int addr_len); 664 665 extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len); 666 extern int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len); 667 extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, 668 u32 info, u8 *payload); 669 extern void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info); 670 extern void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu); 671 672 extern int inet6_release(struct socket *sock); 673 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr, 674 int addr_len); 675 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 676 int *uaddr_len, int peer); 677 extern int inet6_ioctl(struct socket *sock, unsigned int cmd, 678 unsigned long arg); 679 680 extern int inet6_hash_connect(struct inet_timewait_death_row *death_row, 681 struct sock *sk); 682 683 /* 684 * reassembly.c 685 */ 686 extern const struct proto_ops inet6_stream_ops; 687 extern const struct proto_ops inet6_dgram_ops; 688 689 struct group_source_req; 690 struct group_filter; 691 692 extern int ip6_mc_source(int add, int omode, struct sock *sk, 693 struct group_source_req *pgsr); 694 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf); 695 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 696 struct group_filter __user *optval, 697 int __user *optlen); 698 extern unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr, 699 const struct in6_addr *daddr, u32 rnd); 700 701 #ifdef CONFIG_PROC_FS 702 extern int ac6_proc_init(struct net *net); 703 extern void ac6_proc_exit(struct net *net); 704 extern int raw6_proc_init(void); 705 extern void raw6_proc_exit(void); 706 extern int tcp6_proc_init(struct net *net); 707 extern void tcp6_proc_exit(struct net *net); 708 extern int udp6_proc_init(struct net *net); 709 extern void udp6_proc_exit(struct net *net); 710 extern int udplite6_proc_init(void); 711 extern void udplite6_proc_exit(void); 712 extern int ipv6_misc_proc_init(void); 713 extern void ipv6_misc_proc_exit(void); 714 extern int snmp6_register_dev(struct inet6_dev *idev); 715 extern int snmp6_unregister_dev(struct inet6_dev *idev); 716 717 #else 718 static inline int ac6_proc_init(struct net *net) { return 0; } 719 static inline void ac6_proc_exit(struct net *net) { } 720 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; } 721 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; } 722 #endif 723 724 #ifdef CONFIG_SYSCTL 725 extern ctl_table ipv6_route_table_template[]; 726 extern ctl_table ipv6_icmp_table_template[]; 727 728 extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net); 729 extern struct ctl_table *ipv6_route_sysctl_init(struct net *net); 730 extern int ipv6_sysctl_register(void); 731 extern void ipv6_sysctl_unregister(void); 732 #endif 733 734 #endif /* _NET_IPV6_H */ 735