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_mib_init(void *ptr[2], size_t mibsize, size_t mibalign);
 153 void snmp6_mib_free(void *ptr[2]);
 154
 155 struct ip6_ra_chain
 156 {
 157         struct ip6_ra_chain     *next;
 158         struct sock             *sk;
 159         int                     sel;
 160         void                    (*destructor)(struct sock *);
 161 };
 162
 163 extern struct ip6_ra_chain      *ip6_ra_chain;
 164 extern rwlock_t ip6_ra_lock;
 165
 166 /*
 167    This structure is prepared by protocol, when parsing
 168    ancillary data and passed to IPv6.
 169  */
 170
 171 struct ipv6_txoptions
 172 {
 173         /* Length of this structure */
 174         int                     tot_len;
 175
 176         /* length of extension headers   */
 177
 178         __u16                   opt_flen;       /* after fragment hdr */
 179         __u16                   opt_nflen;      /* before fragment hdr */
 180
 181         struct ipv6_opt_hdr     *hopopt;
 182         struct ipv6_opt_hdr     *dst0opt;
 183         struct ipv6_rt_hdr      *srcrt; /* Routing Header */
 184         struct ipv6_opt_hdr     *auth;
 185         struct ipv6_opt_hdr     *dst1opt;
 186
 187         /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
 188 };
 189
 190 struct ip6_flowlabel
 191 {
 192         struct ip6_flowlabel    *next;
 193         u32                     label;
 194         struct in6_addr         dst;
 195         struct ipv6_txoptions   *opt;
 196         atomic_t                users;
 197         unsigned long           linger;
 198         u8                      share;
 199         u32                     owner;
 200         unsigned long           lastuse;
 201         unsigned long           expires;
 202 };
 203
 204 #define IPV6_FLOWINFO_MASK      __constant_htonl(0x0FFFFFFF)
 205 #define IPV6_FLOWLABEL_MASK     __constant_htonl(0x000FFFFF)
 206
 207 struct ipv6_fl_socklist
 208 {
 209         struct ipv6_fl_socklist *next;
 210         struct ip6_flowlabel    *fl;
 211 };
 212
 213 extern struct ip6_flowlabel     *fl6_sock_lookup(struct sock *sk, u32 label);
 214 extern struct ipv6_txoptions    *fl6_merge_options(struct ipv6_txoptions * opt_space,
 215                                                    struct ip6_flowlabel * fl,
 216                                                    struct ipv6_txoptions * fopt);
 217 extern void                     fl6_free_socklist(struct sock *sk);
 218 extern int                      ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
 219 extern void                     ip6_flowlabel_init(void);
 220 extern void                     ip6_flowlabel_cleanup(void);
 221
 222 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
 223 {
 224         if (fl)
 225                 atomic_dec(&fl->users);
 226 }
 227
 228 extern int                      ip6_ra_control(struct sock *sk, int sel,
 229                                                void (*destructor)(struct sock *));
 230
 231
 232 extern int                      ip6_call_ra_chain(struct sk_buff *skb, int sel);
 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_any(const struct in6_addr *a)
 300 {
 301         return ((a->s6_addr32[0] | a->s6_addr32[1] |
 302                  a->s6_addr32[2] | a->s6_addr32[3] ) == 0);
 303 }
 304
 305 /*
 306  *      Prototypes exported by ipv6
 307  */
 308
 309 /*
 310  *      rcv function (called from netdevice level)
 311  */
 312
 313 extern int                      ipv6_rcv(struct sk_buff *skb,
 314                                          struct net_device *dev,
 315                                          struct packet_type *pt);
 316
 317 /*
 318  *      upper-layer output functions
 319  */
 320 extern int                      ip6_xmit(struct sock *sk,
 321                                          struct sk_buff *skb,
 322                                          struct flowi *fl,
 323                                          struct ipv6_txoptions *opt,
 324                                          int ipfragok);
 325
 326 extern int                      ip6_nd_hdr(struct sock *sk,
 327                                            struct sk_buff *skb,
 328                                            struct net_device *dev,
 329                                            struct in6_addr *saddr,
 330                                            struct in6_addr *daddr,
 331                                            int proto, int len);
 332
 333 extern int                      ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
 334
 335 extern int                      ip6_append_data(struct sock *sk,
 336                                                 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
 337                                                 void *from,
 338                                                 int length,
 339                                                 int transhdrlen,
 340                                                 int hlimit,
 341                                                 struct ipv6_txoptions *opt,
 342                                                 struct flowi *fl,
 343                                                 struct rt6_info *rt,
 344                                                 unsigned int flags);
 345
 346 extern int                      ip6_push_pending_frames(struct sock *sk);
 347
 348 extern void                     ip6_flush_pending_frames(struct sock *sk);
 349
 350 extern int                      ip6_dst_lookup(struct sock *sk,
 351                                                struct dst_entry **dst,
 352                                                struct flowi *fl);
 353
 354 /*
 355  *      skb processing functions
 356  */
 357
 358 extern int                      ip6_output(struct sk_buff **pskb);
 359 extern int                      ip6_forward(struct sk_buff *skb);
 360 extern int                      ip6_input(struct sk_buff *skb);
 361 extern int                      ip6_mc_input(struct sk_buff *skb);
 362
 363 /*
 364  *      Extension header (options) processing
 365  */
 366
 367 extern u8 *                     ipv6_build_nfrag_opts(struct sk_buff *skb,
 368                                                       u8 *prev_hdr,
 369                                                       struct ipv6_txoptions *opt,
 370                                                       struct in6_addr *daddr,
 371                                                       u32 jumbolen);
 372 extern u8 *                     ipv6_build_frag_opts(struct sk_buff *skb,
 373                                                      u8 *prev_hdr,
 374                                                      struct ipv6_txoptions *opt);
 375 extern void                     ipv6_push_nfrag_opts(struct sk_buff *skb,
 376                                                      struct ipv6_txoptions *opt,
 377                                                      u8 *proto,
 378                                                      struct in6_addr **daddr_p);
 379 extern void                     ipv6_push_frag_opts(struct sk_buff *skb,
 380                                                     struct ipv6_txoptions *opt,
 381                                                     u8 *proto);
 382
 383 extern int                      ipv6_skip_exthdr(const struct sk_buff *, int start,
 384                                                  u8 *nexthdrp, int len);
 385
 386 extern int                      ipv6_ext_hdr(u8 nexthdr);
 387
 388 extern struct ipv6_txoptions *  ipv6_invert_rthdr(struct sock *sk,
 389                                                   struct ipv6_rt_hdr *hdr);
 390
 391
 392 /*
 393  *      socket options (ipv6_sockglue.c)
 394  */
 395
 396 extern int                      ipv6_setsockopt(struct sock *sk, int level,
 397                                                 int optname,
 398                                                 char __user *optval,
 399                                                 int optlen);
 400 extern int                      ipv6_getsockopt(struct sock *sk, int level,
 401                                                 int optname,
 402                                                 char __user *optval,
 403                                                 int __user *optlen);
 404
 405 extern void                     ipv6_packet_init(void);
 406
 407 extern void                     ipv6_packet_cleanup(void);
 408
 409 extern int                      ip6_datagram_connect(struct sock *sk,
 410                                                      struct sockaddr *addr, int addr_len);
 411
 412 extern int                      ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
 413 extern void                     ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, u16 port,
 414                                                 u32 info, u8 *payload);
 415 extern void                     ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info);
 416
 417 extern int inet6_release(struct socket *sock);
 418 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
 419                       int addr_len);
 420 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 421                          int *uaddr_len, int peer);
 422 extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
 423                        unsigned long arg);
 424
 425 /*
 426  * reassembly.c
 427  */
 428 extern int sysctl_ip6frag_high_thresh;
 429 extern int sysctl_ip6frag_low_thresh;
 430 extern int sysctl_ip6frag_time;
 431 extern int sysctl_ip6frag_secret_interval;
 432
 433 #endif /* __KERNEL__ */
 434 #endif /* _NET_IPV6_H */
 435
 436
 437