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 <net/sock.h>
 108
 109 /* sysctls */
 110 extern int sysctl_ipv6_bindv6only;
 111 extern int sysctl_mld_max_msf;
 112
 113 /* MIBs */
 114 DECLARE_SNMP_STAT(struct ipstats_mib, ipv6_statistics);
 115 #define IP6_INC_STATS(field)            SNMP_INC_STATS(ipv6_statistics, field)
 116 #define IP6_INC_STATS_BH(field)         SNMP_INC_STATS_BH(ipv6_statistics, field)
 117 #define IP6_INC_STATS_USER(field)       SNMP_INC_STATS_USER(ipv6_statistics, field)
 118 DECLARE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics);
 119 #define ICMP6_INC_STATS(idev, field)            ({                      \
 120         struct inet6_dev *_idev = (idev);                               \
 121         if (likely(_idev != NULL))                                      \
 122                 SNMP_INC_STATS(idev->stats.icmpv6, field);              \
 123         SNMP_INC_STATS(icmpv6_statistics, field);                       \
 124 })
 125 #define ICMP6_INC_STATS_BH(idev, field)         ({                      \
 126         struct inet6_dev *_idev = (idev);                               \
 127         if (likely(_idev != NULL))                                      \
 128                 SNMP_INC_STATS_BH((_idev)->stats.icmpv6, field);        \
 129         SNMP_INC_STATS_BH(icmpv6_statistics, field);                    \
 130 })
 131 #define ICMP6_INC_STATS_USER(idev, field)       ({                      \
 132         struct inet6_dev *_idev = (idev);                               \
 133         if (likely(_idev != NULL))                                      \
 134                 SNMP_INC_STATS_USER(_idev->stats.icmpv6, field);        \
 135         SNMP_INC_STATS_USER(icmpv6_statistics, field);                  \
 136 })
 137 #define ICMP6_INC_STATS_OFFSET_BH(idev, field, offset)  ({                      \
 138         struct inet6_dev *_idev = idev;                                         \
 139         __typeof__(offset) _offset = (offset);                                  \
 140         if (likely(_idev != NULL))                                              \
 141                 SNMP_INC_STATS_OFFSET_BH(_idev->stats.icmpv6, field, _offset);  \
 142         SNMP_INC_STATS_OFFSET_BH(icmpv6_statistics, field, _offset);            \
 143 })
 144 DECLARE_SNMP_STAT(struct udp_mib, udp_stats_in6);
 145 #define UDP6_INC_STATS(field)           SNMP_INC_STATS(udp_stats_in6, field)
 146 #define UDP6_INC_STATS_BH(field)        SNMP_INC_STATS_BH(udp_stats_in6, field)
 147 #define UDP6_INC_STATS_USER(field)      SNMP_INC_STATS_USER(udp_stats_in6, field)
 148 extern atomic_t                 inet6_sock_nr;
 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     *auth;
 187         struct ipv6_opt_hdr     *dst1opt;
 188
 189         /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
 190 };
 191
 192 struct ip6_flowlabel
 193 {
 194         struct ip6_flowlabel    *next;
 195         u32                     label;
 196         struct in6_addr         dst;
 197         struct ipv6_txoptions   *opt;
 198         atomic_t                users;
 199         unsigned long           linger;
 200         u8                      share;
 201         u32                     owner;
 202         unsigned long           lastuse;
 203         unsigned long           expires;
 204 };
 205
 206 #define IPV6_FLOWINFO_MASK      __constant_htonl(0x0FFFFFFF)
 207 #define IPV6_FLOWLABEL_MASK     __constant_htonl(0x000FFFFF)
 208
 209 struct ipv6_fl_socklist
 210 {
 211         struct ipv6_fl_socklist *next;
 212         struct ip6_flowlabel    *fl;
 213 };
 214
 215 extern struct ip6_flowlabel     *fl6_sock_lookup(struct sock *sk, u32 label);
 216 extern struct ipv6_txoptions    *fl6_merge_options(struct ipv6_txoptions * opt_space,
 217                                                    struct ip6_flowlabel * fl,
 218                                                    struct ipv6_txoptions * fopt);
 219 extern void                     fl6_free_socklist(struct sock *sk);
 220 extern int                      ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
 221 extern void                     ip6_flowlabel_init(void);
 222 extern void                     ip6_flowlabel_cleanup(void);
 223
 224 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
 225 {
 226         if (fl)
 227                 atomic_dec(&fl->users);
 228 }
 229
 230 extern int                      ip6_ra_control(struct sock *sk, int sel,
 231                                                void (*destructor)(struct sock *));
 232
 233
 234 extern int                      ipv6_parse_hopopts(struct sk_buff *skb, int);
 235
 236 extern struct ipv6_txoptions *  ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
 237
 238 extern int ip6_frag_nqueues;
 239 extern atomic_t ip6_frag_mem;
 240
 241 #define IPV6_FRAG_TIMEOUT       (60*HZ)         /* 60 seconds */
 242
 243 /*
 244  *      Function prototype for build_xmit
 245  */
 246
 247 typedef int             (*inet_getfrag_t) (const void *data,
 248                                            struct in6_addr *addr,
 249                                            char *,
 250                                            unsigned int, unsigned int);
 251
 252
 253 extern int              ipv6_addr_type(const struct in6_addr *addr);
 254
 255 static inline int ipv6_addr_scope(const struct in6_addr *addr)
 256 {
 257         return ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
 258 }
 259
 260 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
 261 {
 262         return memcmp((const void *) a1, (const void *) a2, sizeof(struct in6_addr));
 263 }
 264
 265 static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2)
 266 {
 267         memcpy((void *) a1, (const void *) a2, sizeof(struct in6_addr));
 268 }
 269
 270 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
 271                                     const struct in6_addr *addr,
 272                                     int plen)
 273 {
 274         /* caller must guarantee 0 <= plen <= 128 */
 275         int o = plen >> 3,
 276             b = plen & 0x7;
 277
 278         memcpy(pfx->s6_addr, addr, o);
 279         if (b != 0) {
 280                 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
 281                 o++;
 282         }
 283         if (o < 16)
 284                 memset(pfx->s6_addr + o, 0, 16 - o);
 285 }
 286
 287 #ifndef __HAVE_ARCH_ADDR_SET
 288 static inline void ipv6_addr_set(struct in6_addr *addr,
 289                                      __u32 w1, __u32 w2,
 290                                      __u32 w3, __u32 w4)
 291 {
 292         addr->s6_addr32[0] = w1;
 293         addr->s6_addr32[1] = w2;
 294         addr->s6_addr32[2] = w3;
 295         addr->s6_addr32[3] = w4;
 296 }
 297 #endif
 298
 299 static inline int ipv6_addr_equal(const struct in6_addr *a1,
 300                                   const struct in6_addr *a2)
 301 {
 302         return (a1->s6_addr32[0] == a2->s6_addr32[0] &&
 303                 a1->s6_addr32[1] == a2->s6_addr32[1] &&
 304                 a1->s6_addr32[2] == a2->s6_addr32[2] &&
 305                 a1->s6_addr32[3] == a2->s6_addr32[3]);
 306 }
 307
 308 static inline int __ipv6_prefix_equal(const u32 *a1, const u32 *a2,
 309                                       unsigned int prefixlen)
 310 {
 311         unsigned pdw, pbi;
 312
 313         /* check complete u32 in prefix */
 314         pdw = prefixlen >> 5;
 315         if (pdw && memcmp(a1, a2, pdw << 2))
 316                 return 0;
 317
 318         /* check incomplete u32 in prefix */
 319         pbi = prefixlen & 0x1f;
 320         if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
 321                 return 0;
 322
 323         return 1;
 324 }
 325
 326 static inline int ipv6_prefix_equal(const struct in6_addr *a1,
 327                                     const struct in6_addr *a2,
 328                                     unsigned int prefixlen)
 329 {
 330         return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32,
 331                                    prefixlen);
 332 }
 333
 334 static inline int ipv6_addr_any(const struct in6_addr *a)
 335 {
 336         return ((a->s6_addr32[0] | a->s6_addr32[1] |
 337                  a->s6_addr32[2] | a->s6_addr32[3] ) == 0);
 338 }
 339
 340 /*
 341  *      Prototypes exported by ipv6
 342  */
 343
 344 /*
 345  *      rcv function (called from netdevice level)
 346  */
 347
 348 extern int                      ipv6_rcv(struct sk_buff *skb,
 349                                          struct net_device *dev,
 350                                          struct packet_type *pt);
 351
 352 /*
 353  *      upper-layer output functions
 354  */
 355 extern int                      ip6_xmit(struct sock *sk,
 356                                          struct sk_buff *skb,
 357                                          struct flowi *fl,
 358                                          struct ipv6_txoptions *opt,
 359                                          int ipfragok);
 360
 361 extern int                      ip6_nd_hdr(struct sock *sk,
 362                                            struct sk_buff *skb,
 363                                            struct net_device *dev,
 364                                            struct in6_addr *saddr,
 365                                            struct in6_addr *daddr,
 366                                            int proto, int len);
 367
 368 extern int                      ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
 369
 370 extern int                      ip6_append_data(struct sock *sk,
 371                                                 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
 372                                                 void *from,
 373                                                 int length,
 374                                                 int transhdrlen,
 375                                                 int hlimit,
 376                                                 struct ipv6_txoptions *opt,
 377                                                 struct flowi *fl,
 378                                                 struct rt6_info *rt,
 379                                                 unsigned int flags);
 380
 381 extern int                      ip6_push_pending_frames(struct sock *sk);
 382
 383 extern void                     ip6_flush_pending_frames(struct sock *sk);
 384
 385 extern int                      ip6_dst_lookup(struct sock *sk,
 386                                                struct dst_entry **dst,
 387                                                struct flowi *fl);
 388
 389 /*
 390  *      skb processing functions
 391  */
 392
 393 extern int                      ip6_output(struct sk_buff *skb);
 394 extern int                      ip6_forward(struct sk_buff *skb);
 395 extern int                      ip6_input(struct sk_buff *skb);
 396 extern int                      ip6_mc_input(struct sk_buff *skb);
 397
 398 /*
 399  *      Extension header (options) processing
 400  */
 401
 402 extern u8 *                     ipv6_build_nfrag_opts(struct sk_buff *skb,
 403                                                       u8 *prev_hdr,
 404                                                       struct ipv6_txoptions *opt,
 405                                                       struct in6_addr *daddr,
 406                                                       u32 jumbolen);
 407 extern u8 *                     ipv6_build_frag_opts(struct sk_buff *skb,
 408                                                      u8 *prev_hdr,
 409                                                      struct ipv6_txoptions *opt);
 410 extern void                     ipv6_push_nfrag_opts(struct sk_buff *skb,
 411                                                      struct ipv6_txoptions *opt,
 412                                                      u8 *proto,
 413                                                      struct in6_addr **daddr_p);
 414 extern void                     ipv6_push_frag_opts(struct sk_buff *skb,
 415                                                     struct ipv6_txoptions *opt,
 416                                                     u8 *proto);
 417
 418 extern int                      ipv6_skip_exthdr(const struct sk_buff *, int start,
 419                                                  u8 *nexthdrp);
 420
 421 extern int                      ipv6_ext_hdr(u8 nexthdr);
 422
 423 extern struct ipv6_txoptions *  ipv6_invert_rthdr(struct sock *sk,
 424                                                   struct ipv6_rt_hdr *hdr);
 425
 426
 427 /*
 428  *      socket options (ipv6_sockglue.c)
 429  */
 430
 431 extern int                      ipv6_setsockopt(struct sock *sk, int level,
 432                                                 int optname,
 433                                                 char __user *optval,
 434                                                 int optlen);
 435 extern int                      ipv6_getsockopt(struct sock *sk, int level,
 436                                                 int optname,
 437                                                 char __user *optval,
 438                                                 int __user *optlen);
 439
 440 extern void                     ipv6_packet_init(void);
 441
 442 extern void                     ipv6_packet_cleanup(void);
 443
 444 extern int                      ip6_datagram_connect(struct sock *sk,
 445                                                      struct sockaddr *addr, int addr_len);
 446
 447 extern int                      ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
 448 extern void                     ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, u16 port,
 449                                                 u32 info, u8 *payload);
 450 extern void                     ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info);
 451
 452 extern int inet6_release(struct socket *sock);
 453 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
 454                       int addr_len);
 455 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 456                          int *uaddr_len, int peer);
 457 extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
 458                        unsigned long arg);
 459
 460 /*
 461  * reassembly.c
 462  */
 463 extern int sysctl_ip6frag_high_thresh;
 464 extern int sysctl_ip6frag_low_thresh;
 465 extern int sysctl_ip6frag_time;
 466 extern int sysctl_ip6frag_secret_interval;
 467
 468 #endif /* __KERNEL__ */
 469 #endif /* _NET_IPV6_H */
 470
 471
 472