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_ESP 50 /* Encapsulating security payload. */ 38#define NEXTHDR_AUTH 51 /* Authentication header. */ 39#define NEXTHDR_ICMP 58 /* ICMP for IPv6. */ 40#define NEXTHDR_NONE 59 /* No next header */ 41#define NEXTHDR_DEST 60 /* Destination options header. */ 42#define NEXTHDR_MOBILITY 135 /* Mobility header. */ 43 44#define NEXTHDR_MAX 255 45 46 47 48#define IPV6_DEFAULT_HOPLIMIT 64 49#define IPV6_DEFAULT_MCASTHOPS 1 50 51/* 52 * Addr type 53 * 54 * type - unicast | multicast 55 * scope - local | site | global 56 * v4 - compat 57 * v4mapped 58 * any 59 * loopback 60 */ 61 62#define IPV6_ADDR_ANY 0x0000U 63 64#define IPV6_ADDR_UNICAST 0x0001U 65#define IPV6_ADDR_MULTICAST 0x0002U 66 67#define IPV6_ADDR_LOOPBACK 0x0010U 68#define IPV6_ADDR_LINKLOCAL 0x0020U 69#define IPV6_ADDR_SITELOCAL 0x0040U 70 71#define IPV6_ADDR_COMPATv4 0x0080U 72 73#define IPV6_ADDR_SCOPE_MASK 0x00f0U 74 75#define IPV6_ADDR_MAPPED 0x1000U 76 77/* 78 * Addr scopes 79 */ 80#ifdef __KERNEL__ 81#define IPV6_ADDR_MC_SCOPE(a) \ 82 ((a)->s6_addr[1] & 0x0f) /* nonstandard */ 83#define __IPV6_ADDR_SCOPE_INVALID -1 84#endif 85#define IPV6_ADDR_SCOPE_NODELOCAL 0x01 86#define IPV6_ADDR_SCOPE_LINKLOCAL 0x02 87#define IPV6_ADDR_SCOPE_SITELOCAL 0x05 88#define IPV6_ADDR_SCOPE_ORGLOCAL 0x08 89#define IPV6_ADDR_SCOPE_GLOBAL 0x0e 90 91/* 92 * fragmentation header 93 */ 94 95struct frag_hdr { 96 __u8 nexthdr; 97 __u8 reserved; 98 __be16 frag_off; 99 __be32 identification; 100}; 101 102#define IP6_MF 0x0001 103 104#ifdef __KERNEL__ 105 106#include <net/sock.h> 107 108/* sysctls */ 109extern int sysctl_mld_max_msf; 110extern struct ctl_path net_ipv6_ctl_path[]; 111 112#define _DEVINC(net, statname, modifier, idev, field) \ 113({ \ 114 struct inet6_dev *_idev = (idev); \ 115 if (likely(_idev != NULL)) \ 116 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \ 117 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\ 118}) 119 120#define _DEVADD(net, statname, modifier, idev, field, val) \ 121({ \ 122 struct inet6_dev *_idev = (idev); \ 123 if (likely(_idev != NULL)) \ 124 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \ 125 SNMP_ADD_STATS##modifier((net)->mib.statname##_statistics, (field), (val));\ 126}) 127 128#define _DEVUPD(net, statname, modifier, idev, field, val) \ 129({ \ 130 struct inet6_dev *_idev = (idev); \ 131 if (likely(_idev != NULL)) \ 132 SNMP_UPD_PO_STATS##modifier((_idev)->stats.statname, field, (val)); \ 133 SNMP_UPD_PO_STATS##modifier((net)->mib.statname##_statistics, field, (val));\ 134}) 135 136/* MIBs */ 137 138#define IP6_INC_STATS(net, idev,field) \ 139 _DEVINC(net, ipv6, 64, idev, field) 140#define IP6_INC_STATS_BH(net, idev,field) \ 141 _DEVINC(net, ipv6, 64_BH, idev, field) 142#define IP6_ADD_STATS(net, idev,field,val) \ 143 _DEVADD(net, ipv6, 64, idev, field, val) 144#define IP6_ADD_STATS_BH(net, idev,field,val) \ 145 _DEVADD(net, ipv6, 64_BH, idev, field, val) 146#define IP6_UPD_PO_STATS(net, idev,field,val) \ 147 _DEVUPD(net, ipv6, 64, idev, field, val) 148#define IP6_UPD_PO_STATS_BH(net, idev,field,val) \ 149 _DEVUPD(net, ipv6, 64_BH, idev, field, val) 150#define ICMP6_INC_STATS(net, idev, field) \ 151 _DEVINC(net, icmpv6, , idev, field) 152#define ICMP6_INC_STATS_BH(net, idev, field) \ 153 _DEVINC(net, icmpv6, _BH, idev, field) 154 155#define ICMP6MSGOUT_INC_STATS(net, idev, field) \ 156 _DEVINC(net, icmpv6msg, , idev, field +256) 157#define ICMP6MSGOUT_INC_STATS_BH(net, idev, field) \ 158 _DEVINC(net, icmpv6msg, _BH, idev, field +256) 159#define ICMP6MSGIN_INC_STATS_BH(net, idev, field) \ 160 _DEVINC(net, icmpv6msg, _BH, idev, field) 161 162struct ip6_ra_chain { 163 struct ip6_ra_chain *next; 164 struct sock *sk; 165 int sel; 166 void (*destructor)(struct sock *); 167}; 168 169extern struct ip6_ra_chain *ip6_ra_chain; 170extern rwlock_t ip6_ra_lock; 171 172/* 173 This structure is prepared by protocol, when parsing 174 ancillary data and passed to IPv6. 175 */ 176 177struct ipv6_txoptions { 178 /* Length of this structure */ 179 int tot_len; 180 181 /* length of extension headers */ 182 183 __u16 opt_flen; /* after fragment hdr */ 184 __u16 opt_nflen; /* before fragment hdr */ 185 186 struct ipv6_opt_hdr *hopopt; 187 struct ipv6_opt_hdr *dst0opt; 188 struct ipv6_rt_hdr *srcrt; /* Routing Header */ 189 struct ipv6_opt_hdr *dst1opt; 190 191 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */ 192}; 193 194struct ip6_flowlabel { 195 struct ip6_flowlabel *next; 196 __be32 label; 197 atomic_t users; 198 struct in6_addr dst; 199 struct ipv6_txoptions *opt; 200 unsigned long linger; 201 u8 share; 202 u32 owner; 203 unsigned long lastuse; 204 unsigned long expires; 205 struct net *fl_net; 206}; 207 208#define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF) 209#define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF) 210 211struct ipv6_fl_socklist { 212 struct ipv6_fl_socklist *next; 213 struct ip6_flowlabel *fl; 214}; 215 216extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label); 217extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space, 218 struct ip6_flowlabel * fl, 219 struct ipv6_txoptions * fopt); 220extern void fl6_free_socklist(struct sock *sk); 221extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen); 222extern int ip6_flowlabel_init(void); 223extern void ip6_flowlabel_cleanup(void); 224 225static inline void fl6_sock_release(struct ip6_flowlabel *fl) 226{ 227 if (fl) 228 atomic_dec(&fl->users); 229} 230 231extern int ip6_ra_control(struct sock *sk, int sel); 232 233extern int ipv6_parse_hopopts(struct sk_buff *skb); 234 235extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt); 236extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt, 237 int newtype, 238 struct ipv6_opt_hdr __user *newopt, 239 int newoptlen); 240struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space, 241 struct ipv6_txoptions *opt); 242 243extern int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb); 244 245int ip6_frag_nqueues(struct net *net); 246int ip6_frag_mem(struct net *net); 247 248#define IPV6_FRAG_HIGH_THRESH (256 * 1024) /* 262144 */ 249#define IPV6_FRAG_LOW_THRESH (192 * 1024) /* 196608 */ 250#define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */ 251 252extern int __ipv6_addr_type(const struct in6_addr *addr); 253static inline int ipv6_addr_type(const struct in6_addr *addr) 254{ 255 return __ipv6_addr_type(addr) & 0xffff; 256} 257 258static inline int ipv6_addr_scope(const struct in6_addr *addr) 259{ 260 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK; 261} 262 263static inline int __ipv6_addr_src_scope(int type) 264{ 265 return (type == IPV6_ADDR_ANY ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16)); 266} 267 268static inline int ipv6_addr_src_scope(const struct in6_addr *addr) 269{ 270 return __ipv6_addr_src_scope(__ipv6_addr_type(addr)); 271} 272 273static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2) 274{ 275 return memcmp(a1, a2, sizeof(struct in6_addr)); 276} 277 278static inline int 279ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m, 280 const struct in6_addr *a2) 281{ 282 return (!!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) | 283 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) | 284 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) | 285 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]))); 286} 287 288static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2) 289{ 290 memcpy(a1, a2, sizeof(struct in6_addr)); 291} 292 293static inline void ipv6_addr_prefix(struct in6_addr *pfx, 294 const struct in6_addr *addr, 295 int plen) 296{ 297 /* caller must guarantee 0 <= plen <= 128 */ 298 int o = plen >> 3, 299 b = plen & 0x7; 300 301 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr)); 302 memcpy(pfx->s6_addr, addr, o); 303 if (b != 0) 304 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b); 305} 306 307static inline void ipv6_addr_set(struct in6_addr *addr, 308 __be32 w1, __be32 w2, 309 __be32 w3, __be32 w4) 310{ 311 addr->s6_addr32[0] = w1; 312 addr->s6_addr32[1] = w2; 313 addr->s6_addr32[2] = w3; 314 addr->s6_addr32[3] = w4; 315} 316 317static inline int ipv6_addr_equal(const struct in6_addr *a1, 318 const struct in6_addr *a2) 319{ 320 return (((a1->s6_addr32[0] ^ a2->s6_addr32[0]) | 321 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) | 322 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) | 323 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0); 324} 325 326static inline int __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2, 327 unsigned int prefixlen) 328{ 329 unsigned pdw, pbi; 330 331 /* check complete u32 in prefix */ 332 pdw = prefixlen >> 5; 333 if (pdw && memcmp(a1, a2, pdw << 2)) 334 return 0; 335 336 /* check incomplete u32 in prefix */ 337 pbi = prefixlen & 0x1f; 338 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi)))) 339 return 0; 340 341 return 1; 342} 343 344static inline int ipv6_prefix_equal(const struct in6_addr *a1, 345 const struct in6_addr *a2, 346 unsigned int prefixlen) 347{ 348 return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32, 349 prefixlen); 350} 351 352struct inet_frag_queue; 353 354enum ip6_defrag_users { 355 IP6_DEFRAG_LOCAL_DELIVER, 356 IP6_DEFRAG_CONNTRACK_IN, 357 __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX, 358 IP6_DEFRAG_CONNTRACK_OUT, 359 __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX, 360 IP6_DEFRAG_CONNTRACK_BRIDGE_IN, 361 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX, 362}; 363 364struct ip6_create_arg { 365 __be32 id; 366 u32 user; 367 struct in6_addr *src; 368 struct in6_addr *dst; 369}; 370 371void ip6_frag_init(struct inet_frag_queue *q, void *a); 372int ip6_frag_match(struct inet_frag_queue *q, void *a); 373 374static inline int ipv6_addr_any(const struct in6_addr *a) 375{ 376 return ((a->s6_addr32[0] | a->s6_addr32[1] | 377 a->s6_addr32[2] | a->s6_addr32[3] ) == 0); 378} 379 380static inline int ipv6_addr_loopback(const struct in6_addr *a) 381{ 382 return ((a->s6_addr32[0] | a->s6_addr32[1] | 383 a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0); 384} 385 386static inline int ipv6_addr_v4mapped(const struct in6_addr *a) 387{ 388 return ((a->s6_addr32[0] | a->s6_addr32[1] | 389 (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0); 390} 391 392/* 393 * Check for a RFC 4843 ORCHID address 394 * (Overlay Routable Cryptographic Hash Identifiers) 395 */ 396static inline int ipv6_addr_orchid(const struct in6_addr *a) 397{ 398 return ((a->s6_addr32[0] & htonl(0xfffffff0)) 399 == htonl(0x20010010)); 400} 401 402static inline void ipv6_addr_set_v4mapped(const __be32 addr, 403 struct in6_addr *v4mapped) 404{ 405 ipv6_addr_set(v4mapped, 406 0, 0, 407 htonl(0x0000FFFF), 408 addr); 409} 410 411/* 412 * find the first different bit between two addresses 413 * length of address must be a multiple of 32bits 414 */ 415static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen) 416{ 417 const __be32 *a1 = token1, *a2 = token2; 418 int i; 419 420 addrlen >>= 2; 421 422 for (i = 0; i < addrlen; i++) { 423 __be32 xb = a1[i] ^ a2[i]; 424 if (xb) 425 return i * 32 + 31 - __fls(ntohl(xb)); 426 } 427 428 /* 429 * we should *never* get to this point since that 430 * would mean the addrs are equal 431 * 432 * However, we do get to it 8) And exacly, when 433 * addresses are equal 8) 434 * 435 * ip route add 1111::/128 via ... 436 * ip route add 1111::/64 via ... 437 * and we are here. 438 * 439 * Ideally, this function should stop comparison 440 * at prefix length. It does not, but it is still OK, 441 * if returned value is greater than prefix length. 442 * --ANK (980803) 443 */ 444 return (addrlen << 5); 445} 446 447static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2) 448{ 449 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr)); 450} 451 452static __inline__ void ipv6_select_ident(struct frag_hdr *fhdr) 453{ 454 static u32 ipv6_fragmentation_id = 1; 455 static DEFINE_SPINLOCK(ip6_id_lock); 456 457 spin_lock_bh(&ip6_id_lock); 458 fhdr->identification = htonl(ipv6_fragmentation_id); 459 if (++ipv6_fragmentation_id == 0) 460 ipv6_fragmentation_id = 1; 461 spin_unlock_bh(&ip6_id_lock); 462} 463 464/* 465 * Prototypes exported by ipv6 466 */ 467 468/* 469 * rcv function (called from netdevice level) 470 */ 471 472extern int ipv6_rcv(struct sk_buff *skb, 473 struct net_device *dev, 474 struct packet_type *pt, 475 struct net_device *orig_dev); 476 477extern int ip6_rcv_finish(struct sk_buff *skb); 478 479/* 480 * upper-layer output functions 481 */ 482extern int ip6_xmit(struct sock *sk, 483 struct sk_buff *skb, 484 struct flowi *fl, 485 struct ipv6_txoptions *opt); 486 487extern int ip6_nd_hdr(struct sock *sk, 488 struct sk_buff *skb, 489 struct net_device *dev, 490 const struct in6_addr *saddr, 491 const struct in6_addr *daddr, 492 int proto, int len); 493 494extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr); 495 496extern int ip6_append_data(struct sock *sk, 497 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb), 498 void *from, 499 int length, 500 int transhdrlen, 501 int hlimit, 502 int tclass, 503 struct ipv6_txoptions *opt, 504 struct flowi *fl, 505 struct rt6_info *rt, 506 unsigned int flags, 507 int dontfrag); 508 509extern int ip6_push_pending_frames(struct sock *sk); 510 511extern void ip6_flush_pending_frames(struct sock *sk); 512 513extern int ip6_dst_lookup(struct sock *sk, 514 struct dst_entry **dst, 515 struct flowi *fl); 516extern int ip6_dst_blackhole(struct sock *sk, 517 struct dst_entry **dst, 518 struct flowi *fl); 519extern int ip6_sk_dst_lookup(struct sock *sk, 520 struct dst_entry **dst, 521 struct flowi *fl); 522 523/* 524 * skb processing functions 525 */ 526 527extern int ip6_output(struct sk_buff *skb); 528extern int ip6_forward(struct sk_buff *skb); 529extern int ip6_input(struct sk_buff *skb); 530extern int ip6_mc_input(struct sk_buff *skb); 531 532extern int __ip6_local_out(struct sk_buff *skb); 533extern int ip6_local_out(struct sk_buff *skb); 534 535/* 536 * Extension header (options) processing 537 */ 538 539extern void ipv6_push_nfrag_opts(struct sk_buff *skb, 540 struct ipv6_txoptions *opt, 541 u8 *proto, 542 struct in6_addr **daddr_p); 543extern void ipv6_push_frag_opts(struct sk_buff *skb, 544 struct ipv6_txoptions *opt, 545 u8 *proto); 546 547extern int ipv6_skip_exthdr(const struct sk_buff *, int start, 548 u8 *nexthdrp); 549 550extern int ipv6_ext_hdr(u8 nexthdr); 551 552extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type); 553 554extern struct in6_addr *fl6_update_dst(struct flowi *fl, 555 const struct ipv6_txoptions *opt, 556 struct in6_addr *orig); 557 558/* 559 * socket options (ipv6_sockglue.c) 560 */ 561 562extern int ipv6_setsockopt(struct sock *sk, int level, 563 int optname, 564 char __user *optval, 565 unsigned int optlen); 566extern int ipv6_getsockopt(struct sock *sk, int level, 567 int optname, 568 char __user *optval, 569 int __user *optlen); 570extern int compat_ipv6_setsockopt(struct sock *sk, 571 int level, 572 int optname, 573 char __user *optval, 574 unsigned int optlen); 575extern int compat_ipv6_getsockopt(struct sock *sk, 576 int level, 577 int optname, 578 char __user *optval, 579 int __user *optlen); 580 581extern int ip6_datagram_connect(struct sock *sk, 582 struct sockaddr *addr, int addr_len); 583 584extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len); 585extern int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len); 586extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, 587 u32 info, u8 *payload); 588extern void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info); 589extern void ipv6_local_rxpmtu(struct sock *sk, struct flowi *fl, u32 mtu); 590 591extern int inet6_release(struct socket *sock); 592extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr, 593 int addr_len); 594extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 595 int *uaddr_len, int peer); 596extern int inet6_ioctl(struct socket *sock, unsigned int cmd, 597 unsigned long arg); 598 599extern int inet6_hash_connect(struct inet_timewait_death_row *death_row, 600 struct sock *sk); 601 602/* 603 * reassembly.c 604 */ 605extern const struct proto_ops inet6_stream_ops; 606extern const struct proto_ops inet6_dgram_ops; 607 608struct group_source_req; 609struct group_filter; 610 611extern int ip6_mc_source(int add, int omode, struct sock *sk, 612 struct group_source_req *pgsr); 613extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf); 614extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 615 struct group_filter __user *optval, 616 int __user *optlen); 617extern unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr, 618 const struct in6_addr *daddr, u32 rnd); 619 620#ifdef CONFIG_PROC_FS 621extern int ac6_proc_init(struct net *net); 622extern void ac6_proc_exit(struct net *net); 623extern int raw6_proc_init(void); 624extern void raw6_proc_exit(void); 625extern int tcp6_proc_init(struct net *net); 626extern void tcp6_proc_exit(struct net *net); 627extern int udp6_proc_init(struct net *net); 628extern void udp6_proc_exit(struct net *net); 629extern int udplite6_proc_init(void); 630extern void udplite6_proc_exit(void); 631extern int ipv6_misc_proc_init(void); 632extern void ipv6_misc_proc_exit(void); 633extern int snmp6_register_dev(struct inet6_dev *idev); 634extern int snmp6_unregister_dev(struct inet6_dev *idev); 635 636#else 637static inline int ac6_proc_init(struct net *net) { return 0; } 638static inline void ac6_proc_exit(struct net *net) { } 639static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; } 640static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; } 641#endif 642 643#ifdef CONFIG_SYSCTL 644extern ctl_table ipv6_route_table_template[]; 645extern ctl_table ipv6_icmp_table_template[]; 646 647extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net); 648extern struct ctl_table *ipv6_route_sysctl_init(struct net *net); 649extern int ipv6_sysctl_register(void); 650extern void ipv6_sysctl_unregister(void); 651extern int ipv6_static_sysctl_register(void); 652extern void ipv6_static_sysctl_unregister(void); 653#endif 654 655#endif /* __KERNEL__ */ 656#endif /* _NET_IPV6_H */ 657