include/net/ipv6.h

   1 /*
   2  *      Linux INET6 implementation
   3  *
   4  *      Authors:
   5  *      Pedro Roque             <roque@di.fc.ul.pt>
   6  *
   7  *      $Id: ipv6.h,v 1.1 2002/05/20 15:13:07 jgrimm Exp $
   8  *
   9  *      This program is free software; you can redistribute it and/or
  10  *      modify it under the terms of the GNU General Public License
  11  *      as published by the Free Software Foundation; either version
  12  *      2 of the License, or (at your option) any later version.
  13  */
  14
  15 #ifndef _NET_IPV6_H
  16 #define _NET_IPV6_H
  17
  18 #include <linux/ipv6.h>
  19 #include <linux/hardirq.h>
  20 #include <net/ndisc.h>
  21 #include <net/flow.h>
  22 #include <net/snmp.h>
  23
  24 #define SIN6_LEN_RFC2133        24
  25
  26 #define IPV6_MAXPLEN            65535
  27
  28 /*
  29  *      NextHeader field of IPv6 header
  30  */
  31
  32 #define NEXTHDR_HOP             0       /* Hop-by-hop option header. */
  33 #define NEXTHDR_TCP             6       /* TCP segment. */
  34 #define NEXTHDR_UDP             17      /* UDP message. */
  35 #define NEXTHDR_IPV6            41      /* IPv6 in IPv6 */
  36 #define NEXTHDR_ROUTING         43      /* Routing header. */
  37 #define NEXTHDR_FRAGMENT        44      /* Fragmentation/reassembly 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
  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 #define IPV6_ADDR_RESERVED      0x2000U /* reserved address space */
  77
  78 /*
  79  *      Addr scopes
  80  */
  81 #ifdef __KERNEL__
  82 #define IPV6_ADDR_MC_SCOPE(a)   \
  83         ((a)->s6_addr[1] & 0x0f)        /* nonstandard */
  84 #define __IPV6_ADDR_SCOPE_INVALID       -1
  85 #endif
  86 #define IPV6_ADDR_SCOPE_NODELOCAL       0x01
  87 #define IPV6_ADDR_SCOPE_LINKLOCAL       0x02
  88 #define IPV6_ADDR_SCOPE_SITELOCAL       0x05
  89 #define IPV6_ADDR_SCOPE_ORGLOCAL        0x08
  90 #define IPV6_ADDR_SCOPE_GLOBAL          0x0e
  91
  92 /*
  93  *      fragmentation header
  94  */
  95
  96 struct frag_hdr {
  97         unsigned char   nexthdr;
  98         unsigned char   reserved;
  99         unsigned short  frag_off;
 100         __u32           identification;
 101 };
 102
 103 #define IP6_MF  0x0001
 104
 105 #ifdef __KERNEL__
 106
 107 #include <linux/config.h>
 108 #include <net/sock.h>
 109
 110 /* sysctls */
 111 extern int sysctl_ipv6_bindv6only;
 112 extern int sysctl_mld_max_msf;
 113
 114 /* MIBs */
 115 DECLARE_SNMP_STAT(struct ipstats_mib, ipv6_statistics);
 116 #define IP6_INC_STATS(field)            SNMP_INC_STATS(ipv6_statistics, field)
 117 #define IP6_INC_STATS_BH(field)         SNMP_INC_STATS_BH(ipv6_statistics, field)
 118 #define IP6_INC_STATS_USER(field)       SNMP_INC_STATS_USER(ipv6_statistics, field)
 119 DECLARE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics);
 120 #define ICMP6_INC_STATS(idev, field)            ({                      \
 121         struct inet6_dev *_idev = (idev);                               \
 122         if (likely(_idev != NULL))                                      \
 123                 SNMP_INC_STATS(idev->stats.icmpv6, field);              \
 124         SNMP_INC_STATS(icmpv6_statistics, field);                       \
 125 })
 126 #define ICMP6_INC_STATS_BH(idev, field)         ({                      \
 127         struct inet6_dev *_idev = (idev);                               \
 128         if (likely(_idev != NULL))                                      \
 129                 SNMP_INC_STATS_BH((_idev)->stats.icmpv6, field);        \
 130         SNMP_INC_STATS_BH(icmpv6_statistics, field);                    \
 131 })
 132 #define ICMP6_INC_STATS_USER(idev, field)       ({                      \
 133         struct inet6_dev *_idev = (idev);                               \
 134         if (likely(_idev != NULL))                                      \
 135                 SNMP_INC_STATS_USER(_idev->stats.icmpv6, field);        \
 136         SNMP_INC_STATS_USER(icmpv6_statistics, field);                  \
 137 })
 138 #define ICMP6_INC_STATS_OFFSET_BH(idev, field, offset)  ({                      \
 139         struct inet6_dev *_idev = idev;                                         \
 140         __typeof__(offset) _offset = (offset);                                  \
 141         if (likely(_idev != NULL))                                              \
 142                 SNMP_INC_STATS_OFFSET_BH(_idev->stats.icmpv6, field, _offset);  \
 143         SNMP_INC_STATS_OFFSET_BH(icmpv6_statistics, field, _offset);            \
 144 })
 145 DECLARE_SNMP_STAT(struct udp_mib, udp_stats_in6);
 146 #define UDP6_INC_STATS(field)           SNMP_INC_STATS(udp_stats_in6, field)
 147 #define UDP6_INC_STATS_BH(field)        SNMP_INC_STATS_BH(udp_stats_in6, field)
 148 #define UDP6_INC_STATS_USER(field)      SNMP_INC_STATS_USER(udp_stats_in6, field)
 149
 150 int snmp6_register_dev(struct inet6_dev *idev);
 151 int snmp6_unregister_dev(struct inet6_dev *idev);
 152 int snmp6_alloc_dev(struct inet6_dev *idev);
 153 int snmp6_free_dev(struct inet6_dev *idev);
 154 int snmp6_mib_init(void *ptr[2], size_t mibsize, size_t mibalign);
 155 void snmp6_mib_free(void *ptr[2]);
 156
 157 struct ip6_ra_chain
 158 {
 159         struct ip6_ra_chain     *next;
 160         struct sock             *sk;
 161         int                     sel;
 162         void                    (*destructor)(struct sock *);
 163 };
 164
 165 extern struct ip6_ra_chain      *ip6_ra_chain;
 166 extern rwlock_t ip6_ra_lock;
 167
 168 /*
 169    This structure is prepared by protocol, when parsing
 170    ancillary data and passed to IPv6.
 171  */
 172
 173 struct ipv6_txoptions
 174 {
 175         /* Length of this structure */
 176         int                     tot_len;
 177
 178         /* length of extension headers   */
 179
 180         __u16                   opt_flen;       /* after fragment hdr */
 181         __u16                   opt_nflen;      /* before fragment hdr */
 182
 183         struct ipv6_opt_hdr     *hopopt;
 184         struct ipv6_opt_hdr     *dst0opt;
 185         struct ipv6_rt_hdr      *srcrt; /* Routing Header */
 186         struct ipv6_opt_hdr     *dst1opt;
 187
 188         /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
 189 };
 190
 191 struct ip6_flowlabel
 192 {
 193         struct ip6_flowlabel    *next;
 194         u32                     label;
 195         struct in6_addr         dst;
 196         struct ipv6_txoptions   *opt;
 197         atomic_t                users;
 198         unsigned long           linger;
 199         u8                      share;
 200         u32                     owner;
 201         unsigned long           lastuse;
 202         unsigned long           expires;
 203 };
 204
 205 #define IPV6_FLOWINFO_MASK      __constant_htonl(0x0FFFFFFF)
 206 #define IPV6_FLOWLABEL_MASK     __constant_htonl(0x000FFFFF)
 207
 208 struct ipv6_fl_socklist
 209 {
 210         struct ipv6_fl_socklist *next;
 211         struct ip6_flowlabel    *fl;
 212 };
 213
 214 extern struct ip6_flowlabel     *fl6_sock_lookup(struct sock *sk, u32 label);
 215 extern struct ipv6_txoptions    *fl6_merge_options(struct ipv6_txoptions * opt_space,
 216                                                    struct ip6_flowlabel * fl,
 217                                                    struct ipv6_txoptions * fopt);
 218 extern void                     fl6_free_socklist(struct sock *sk);
 219 extern int                      ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
 220 extern void                     ip6_flowlabel_init(void);
 221 extern void                     ip6_flowlabel_cleanup(void);
 222
 223 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
 224 {
 225         if (fl)
 226                 atomic_dec(&fl->users);
 227 }
 228
 229 extern int                      ip6_ra_control(struct sock *sk, int sel,
 230                                                void (*destructor)(struct sock *));
 231
 232
 233 extern int                      ipv6_parse_hopopts(struct sk_buff *skb, int);
 234
 235 extern struct ipv6_txoptions *  ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
 236 extern 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);
 240 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
 241                                           struct ipv6_txoptions *opt);
 242
 243 extern int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb);
 244
 245 extern int ip6_frag_nqueues;
 246 extern atomic_t ip6_frag_mem;
 247
 248 #define IPV6_FRAG_TIMEOUT       (60*HZ)         /* 60 seconds */
 249
 250 /*
 251  *      Function prototype for build_xmit
 252  */
 253
 254 typedef int             (*inet_getfrag_t) (const void *data,
 255                                            struct in6_addr *addr,
 256                                            char *,
 257                                            unsigned int, unsigned int);
 258
 259 extern int __ipv6_addr_type(const struct in6_addr *addr);
 260 static inline int ipv6_addr_type(const struct in6_addr *addr)
 261 {
 262         return __ipv6_addr_type(addr) & 0xffff;
 263 }
 264
 265 static inline int ipv6_addr_scope(const struct in6_addr *addr)
 266 {
 267         return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
 268 }
 269
 270 static inline int __ipv6_addr_src_scope(int type)
 271 {
 272         return (type == IPV6_ADDR_ANY ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16));
 273 }
 274
 275 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
 276 {
 277         return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
 278 }
 279
 280 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
 281 {
 282         return memcmp((const void *) a1, (const void *) a2, sizeof(struct in6_addr));
 283 }
 284
 285 static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2)
 286 {
 287         memcpy((void *) a1, (const void *) a2, sizeof(struct in6_addr));
 288 }
 289
 290 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
 291                                     const struct in6_addr *addr,
 292                                     int plen)
 293 {
 294         /* caller must guarantee 0 <= plen <= 128 */
 295         int o = plen >> 3,
 296             b = plen & 0x7;
 297
 298         memcpy(pfx->s6_addr, addr, o);
 299         if (b != 0) {
 300                 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
 301                 o++;
 302         }
 303         if (o < 16)
 304                 memset(pfx->s6_addr + o, 0, 16 - o);
 305 }
 306
 307 #ifndef __HAVE_ARCH_ADDR_SET
 308 static inline void ipv6_addr_set(struct in6_addr *addr,
 309                                      __u32 w1, __u32 w2,
 310                                      __u32 w3, __u32 w4)
 311 {
 312         addr->s6_addr32[0] = w1;
 313         addr->s6_addr32[1] = w2;
 314         addr->s6_addr32[2] = w3;
 315         addr->s6_addr32[3] = w4;
 316 }
 317 #endif
 318
 319 static inline int ipv6_addr_equal(const struct in6_addr *a1,
 320                                   const struct in6_addr *a2)
 321 {
 322         return (a1->s6_addr32[0] == a2->s6_addr32[0] &&
 323                 a1->s6_addr32[1] == a2->s6_addr32[1] &&
 324                 a1->s6_addr32[2] == a2->s6_addr32[2] &&
 325                 a1->s6_addr32[3] == a2->s6_addr32[3]);
 326 }
 327
 328 static inline int __ipv6_prefix_equal(const u32 *a1, const u32 *a2,
 329                                       unsigned int prefixlen)
 330 {
 331         unsigned pdw, pbi;
 332
 333         /* check complete u32 in prefix */
 334         pdw = prefixlen >> 5;
 335         if (pdw && memcmp(a1, a2, pdw << 2))
 336                 return 0;
 337
 338         /* check incomplete u32 in prefix */
 339         pbi = prefixlen & 0x1f;
 340         if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
 341                 return 0;
 342
 343         return 1;
 344 }
 345
 346 static inline int ipv6_prefix_equal(const struct in6_addr *a1,
 347                                     const struct in6_addr *a2,
 348                                     unsigned int prefixlen)
 349 {
 350         return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32,
 351                                    prefixlen);
 352 }
 353
 354 static inline int ipv6_addr_any(const struct in6_addr *a)
 355 {
 356         return ((a->s6_addr32[0] | a->s6_addr32[1] |
 357                  a->s6_addr32[2] | a->s6_addr32[3] ) == 0);
 358 }
 359
 360 /*
 361  * find the first different bit between two addresses
 362  * length of address must be a multiple of 32bits
 363  */
 364 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
 365 {
 366         const __u32 *a1 = token1, *a2 = token2;
 367         int i;
 368
 369         addrlen >>= 2;
 370
 371         for (i = 0; i < addrlen; i++) {
 372                 __u32 xb = a1[i] ^ a2[i];
 373                 if (xb) {
 374                         int j = 31;
 375
 376                         xb = ntohl(xb);
 377                         while ((xb & (1 << j)) == 0)
 378                                 j--;
 379
 380                         return (i * 32 + 31 - j);
 381                 }
 382         }
 383
 384         /*
 385          *      we should *never* get to this point since that
 386          *      would mean the addrs are equal
 387          *
 388          *      However, we do get to it 8) And exacly, when
 389          *      addresses are equal 8)
 390          *
 391          *      ip route add 1111::/128 via ...
 392          *      ip route add 1111::/64 via ...
 393          *      and we are here.
 394          *
 395          *      Ideally, this function should stop comparison
 396          *      at prefix length. It does not, but it is still OK,
 397          *      if returned value is greater than prefix length.
 398          *                                      --ANK (980803)
 399          */
 400         return (addrlen << 5);
 401 }
 402
 403 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
 404 {
 405         return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
 406 }
 407
 408 /*
 409  *      Prototypes exported by ipv6
 410  */
 411
 412 /*
 413  *      rcv function (called from netdevice level)
 414  */
 415
 416 extern int                      ipv6_rcv(struct sk_buff *skb,
 417                                          struct net_device *dev,
 418                                          struct packet_type *pt,
 419                                          struct net_device *orig_dev);
 420
 421 extern int                      ip6_rcv_finish(struct sk_buff *skb);
 422
 423 /*
 424  *      upper-layer output functions
 425  */
 426 extern int                      ip6_xmit(struct sock *sk,
 427                                          struct sk_buff *skb,
 428                                          struct flowi *fl,
 429                                          struct ipv6_txoptions *opt,
 430                                          int ipfragok);
 431
 432 extern int                      ip6_nd_hdr(struct sock *sk,
 433                                            struct sk_buff *skb,
 434                                            struct net_device *dev,
 435                                            struct in6_addr *saddr,
 436                                            struct in6_addr *daddr,
 437                                            int proto, int len);
 438
 439 extern int                      ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
 440
 441 extern int                      ip6_append_data(struct sock *sk,
 442                                                 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
 443                                                 void *from,
 444                                                 int length,
 445                                                 int transhdrlen,
 446                                                 int hlimit,
 447                                                 int tclass,
 448                                                 struct ipv6_txoptions *opt,
 449                                                 struct flowi *fl,
 450                                                 struct rt6_info *rt,
 451                                                 unsigned int flags);
 452
 453 extern int                      ip6_push_pending_frames(struct sock *sk);
 454
 455 extern void                     ip6_flush_pending_frames(struct sock *sk);
 456
 457 extern int                      ip6_dst_lookup(struct sock *sk,
 458                                                struct dst_entry **dst,
 459                                                struct flowi *fl);
 460
 461 /*
 462  *      skb processing functions
 463  */
 464
 465 extern int                      ip6_output(struct sk_buff *skb);
 466 extern int                      ip6_forward(struct sk_buff *skb);
 467 extern int                      ip6_input(struct sk_buff *skb);
 468 extern int                      ip6_mc_input(struct sk_buff *skb);
 469
 470 /*
 471  *      Extension header (options) processing
 472  */
 473
 474 extern u8 *                     ipv6_build_nfrag_opts(struct sk_buff *skb,
 475                                                       u8 *prev_hdr,
 476                                                       struct ipv6_txoptions *opt,
 477                                                       struct in6_addr *daddr,
 478                                                       u32 jumbolen);
 479 extern u8 *                     ipv6_build_frag_opts(struct sk_buff *skb,
 480                                                      u8 *prev_hdr,
 481                                                      struct ipv6_txoptions *opt);
 482 extern void                     ipv6_push_nfrag_opts(struct sk_buff *skb,
 483                                                      struct ipv6_txoptions *opt,
 484                                                      u8 *proto,
 485                                                      struct in6_addr **daddr_p);
 486 extern void                     ipv6_push_frag_opts(struct sk_buff *skb,
 487                                                     struct ipv6_txoptions *opt,
 488                                                     u8 *proto);
 489
 490 extern int                      ipv6_skip_exthdr(const struct sk_buff *, int start,
 491                                                  u8 *nexthdrp);
 492
 493 extern int                      ipv6_ext_hdr(u8 nexthdr);
 494
 495 extern struct ipv6_txoptions *  ipv6_invert_rthdr(struct sock *sk,
 496                                                   struct ipv6_rt_hdr *hdr);
 497
 498
 499 /*
 500  *      socket options (ipv6_sockglue.c)
 501  */
 502
 503 extern int                      ipv6_setsockopt(struct sock *sk, int level,
 504                                                 int optname,
 505                                                 char __user *optval,
 506                                                 int optlen);
 507 extern int                      ipv6_getsockopt(struct sock *sk, int level,
 508                                                 int optname,
 509                                                 char __user *optval,
 510                                                 int __user *optlen);
 511
 512 extern void                     ipv6_packet_init(void);
 513
 514 extern void                     ipv6_packet_cleanup(void);
 515
 516 extern int                      ip6_datagram_connect(struct sock *sk,
 517                                                      struct sockaddr *addr, int addr_len);
 518
 519 extern int                      ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
 520 extern void                     ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, u16 port,
 521                                                 u32 info, u8 *payload);
 522 extern void                     ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info);
 523
 524 extern int inet6_release(struct socket *sock);
 525 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
 526                       int addr_len);
 527 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 528                          int *uaddr_len, int peer);
 529 extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
 530                        unsigned long arg);
 531
 532 extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
 533                               struct sock *sk);
 534
 535 /*
 536  * reassembly.c
 537  */
 538 extern int sysctl_ip6frag_high_thresh;
 539 extern int sysctl_ip6frag_low_thresh;
 540 extern int sysctl_ip6frag_time;
 541 extern int sysctl_ip6frag_secret_interval;
 542
 543 extern const struct proto_ops inet6_stream_ops;
 544 extern const struct proto_ops inet6_dgram_ops;
 545
 546 struct group_source_req;
 547 struct group_filter;
 548
 549 extern int ip6_mc_source(int add, int omode, struct sock *sk,
 550                          struct group_source_req *pgsr);
 551 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
 552 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 553                          struct group_filter __user *optval,
 554                          int __user *optlen);
 555
 556 #ifdef CONFIG_PROC_FS
 557 extern int  ac6_proc_init(void);
 558 extern void ac6_proc_exit(void);
 559 extern int  raw6_proc_init(void);
 560 extern void raw6_proc_exit(void);
 561 extern int  tcp6_proc_init(void);
 562 extern void tcp6_proc_exit(void);
 563 extern int  udp6_proc_init(void);
 564 extern void udp6_proc_exit(void);
 565 extern int  ipv6_misc_proc_init(void);
 566 extern void ipv6_misc_proc_exit(void);
 567
 568 extern struct rt6_statistics rt6_stats;
 569 #endif
 570
 571 #ifdef CONFIG_SYSCTL
 572 extern ctl_table ipv6_route_table[];
 573 extern ctl_table ipv6_icmp_table[];
 574
 575 extern void ipv6_sysctl_register(void);
 576 extern void ipv6_sysctl_unregister(void);
 577 #endif
 578
 579 #endif /* __KERNEL__ */
 580 #endif /* _NET_IPV6_H */