LXR linux/include/linux/netfilter_ipv6/ip6

   1/*
   2 * 25-Jul-1998 Major changes to allow for ip chain table
   3 *
   4 * 3-Jan-2000 Named tables to allow packet selection for different uses.
   5 */
   6
   7/*
   8 *      Format of an IP6 firewall descriptor
   9 *
  10 *      src, dst, src_mask, dst_mask are always stored in network byte order.
  11 *      flags are stored in host byte order (of course).
  12 *      Port numbers are stored in HOST byte order.
  13 */
  14
  15#ifndef _IP6_TABLES_H
  16#define _IP6_TABLES_H
  17
  18#ifdef __KERNEL__
  19#include <linux/if.h>
  20#include <linux/in6.h>
  21#include <linux/ipv6.h>
  22#include <linux/skbuff.h>
  23#endif
  24#include <linux/types.h>
  25#include <linux/compiler.h>
  26#include <linux/netfilter_ipv6.h>
  27
  28#include <linux/netfilter/x_tables.h>
  29
  30#define IP6T_FUNCTION_MAXNAMELEN XT_FUNCTION_MAXNAMELEN
  31#define IP6T_TABLE_MAXNAMELEN XT_TABLE_MAXNAMELEN
  32
  33#define ip6t_match xt_match
  34#define ip6t_target xt_target
  35#define ip6t_table xt_table
  36#define ip6t_get_revision xt_get_revision
  37
  38/* Yes, Virginia, you have to zero the padding. */
  39struct ip6t_ip6 {
  40        /* Source and destination IP6 addr */
  41        struct in6_addr src, dst;               
  42        /* Mask for src and dest IP6 addr */
  43        struct in6_addr smsk, dmsk;
  44        char iniface[IFNAMSIZ], outiface[IFNAMSIZ];
  45        unsigned char iniface_mask[IFNAMSIZ], outiface_mask[IFNAMSIZ];
  46
  47        /* Upper protocol number
  48         * - The allowed value is 0 (any) or protocol number of last parsable
  49         *   header, which is 50 (ESP), 59 (No Next Header), 135 (MH), or
  50         *   the non IPv6 extension headers.
  51         * - The protocol numbers of IPv6 extension headers except of ESP and
  52         *   MH do not match any packets.
  53         * - You also need to set IP6T_FLAGS_PROTO to "flags" to check protocol.
  54         */
  55        u_int16_t proto;
  56        /* TOS to match iff flags & IP6T_F_TOS */
  57        u_int8_t tos;
  58
  59        /* Flags word */
  60        u_int8_t flags;
  61        /* Inverse flags */
  62        u_int8_t invflags;
  63};
  64
  65#define ip6t_entry_match xt_entry_match
  66#define ip6t_entry_target xt_entry_target
  67#define ip6t_standard_target xt_standard_target
  68
  69#define ip6t_counters   xt_counters
  70
  71/* Values for "flag" field in struct ip6t_ip6 (general ip6 structure). */
  72#define IP6T_F_PROTO            0x01    /* Set if rule cares about upper 
  73                                           protocols */
  74#define IP6T_F_TOS              0x02    /* Match the TOS. */
  75#define IP6T_F_GOTO             0x04    /* Set if jump is a goto */
  76#define IP6T_F_MASK             0x07    /* All possible flag bits mask. */
  77
  78/* Values for "inv" field in struct ip6t_ip6. */
  79#define IP6T_INV_VIA_IN         0x01    /* Invert the sense of IN IFACE. */
  80#define IP6T_INV_VIA_OUT                0x02    /* Invert the sense of OUT IFACE */
  81#define IP6T_INV_TOS            0x04    /* Invert the sense of TOS. */
  82#define IP6T_INV_SRCIP          0x08    /* Invert the sense of SRC IP. */
  83#define IP6T_INV_DSTIP          0x10    /* Invert the sense of DST OP. */
  84#define IP6T_INV_FRAG           0x20    /* Invert the sense of FRAG. */
  85#define IP6T_INV_PROTO          XT_INV_PROTO
  86#define IP6T_INV_MASK           0x7F    /* All possible flag bits mask. */
  87
  88/* This structure defines each of the firewall rules.  Consists of 3
  89   parts which are 1) general IP header stuff 2) match specific
  90   stuff 3) the target to perform if the rule matches */
  91struct ip6t_entry
  92{
  93        struct ip6t_ip6 ipv6;
  94
  95        /* Mark with fields that we care about. */
  96        unsigned int nfcache;
  97
  98        /* Size of ipt_entry + matches */
  99        u_int16_t target_offset;
 100        /* Size of ipt_entry + matches + target */
 101        u_int16_t next_offset;
 102
 103        /* Back pointer */
 104        unsigned int comefrom;
 105
 106        /* Packet and byte counters. */
 107        struct xt_counters counters;
 108
 109        /* The matches (if any), then the target. */
 110        unsigned char elems[0];
 111};
 112
 113/* Standard entry */
 114struct ip6t_standard
 115{
 116        struct ip6t_entry entry;
 117        struct ip6t_standard_target target;
 118};
 119
 120struct ip6t_error_target
 121{
 122        struct ip6t_entry_target target;
 123        char errorname[IP6T_FUNCTION_MAXNAMELEN];
 124};
 125
 126struct ip6t_error
 127{
 128        struct ip6t_entry entry;
 129        struct ip6t_error_target target;
 130};
 131
 132#define IP6T_ENTRY_INIT(__size)                                                \
 133{                                                                              \
 134        .target_offset  = sizeof(struct ip6t_entry),                           \
 135        .next_offset    = (__size),                                            \
 136}
 137
 138#define IP6T_STANDARD_INIT(__verdict)                                          \
 139{                                                                              \
 140        .entry          = IP6T_ENTRY_INIT(sizeof(struct ip6t_standard)),       \
 141        .target         = XT_TARGET_INIT(IP6T_STANDARD_TARGET,                 \
 142                                         sizeof(struct ip6t_standard_target)), \
 143        .target.verdict = -(__verdict) - 1,                                    \
 144}
 145
 146#define IP6T_ERROR_INIT                                                        \
 147{                                                                              \
 148        .entry          = IP6T_ENTRY_INIT(sizeof(struct ip6t_error)),          \
 149        .target         = XT_TARGET_INIT(IP6T_ERROR_TARGET,                    \
 150                                         sizeof(struct ip6t_error_target)),    \
 151        .target.errorname = "ERROR",                                           \
 152}
 153
 154/*
 155 * New IP firewall options for [gs]etsockopt at the RAW IP level.
 156 * Unlike BSD Linux inherits IP options so you don't have to use
 157 * a raw socket for this. Instead we check rights in the calls.
 158 *
 159 * ATTENTION: check linux/in6.h before adding new number here.
 160 */
 161#define IP6T_BASE_CTL                   64
 162
 163#define IP6T_SO_SET_REPLACE             (IP6T_BASE_CTL)
 164#define IP6T_SO_SET_ADD_COUNTERS        (IP6T_BASE_CTL + 1)
 165#define IP6T_SO_SET_MAX                 IP6T_SO_SET_ADD_COUNTERS
 166
 167#define IP6T_SO_GET_INFO                (IP6T_BASE_CTL)
 168#define IP6T_SO_GET_ENTRIES             (IP6T_BASE_CTL + 1)
 169#define IP6T_SO_GET_REVISION_MATCH      (IP6T_BASE_CTL + 4)
 170#define IP6T_SO_GET_REVISION_TARGET     (IP6T_BASE_CTL + 5)
 171#define IP6T_SO_GET_MAX                 IP6T_SO_GET_REVISION_TARGET
 172
 173/* CONTINUE verdict for targets */
 174#define IP6T_CONTINUE XT_CONTINUE
 175
 176/* For standard target */
 177#define IP6T_RETURN XT_RETURN
 178
 179/* TCP/UDP matching stuff */
 180#include <linux/netfilter/xt_tcpudp.h>
 181
 182#define ip6t_tcp xt_tcp
 183#define ip6t_udp xt_udp
 184
 185/* Values for "inv" field in struct ipt_tcp. */
 186#define IP6T_TCP_INV_SRCPT      XT_TCP_INV_SRCPT
 187#define IP6T_TCP_INV_DSTPT      XT_TCP_INV_DSTPT
 188#define IP6T_TCP_INV_FLAGS      XT_TCP_INV_FLAGS
 189#define IP6T_TCP_INV_OPTION     XT_TCP_INV_OPTION
 190#define IP6T_TCP_INV_MASK       XT_TCP_INV_MASK
 191
 192/* Values for "invflags" field in struct ipt_udp. */
 193#define IP6T_UDP_INV_SRCPT      XT_UDP_INV_SRCPT
 194#define IP6T_UDP_INV_DSTPT      XT_UDP_INV_DSTPT
 195#define IP6T_UDP_INV_MASK       XT_UDP_INV_MASK
 196
 197/* ICMP matching stuff */
 198struct ip6t_icmp
 199{
 200        u_int8_t type;                          /* type to match */
 201        u_int8_t code[2];                       /* range of code */
 202        u_int8_t invflags;                      /* Inverse flags */
 203};
 204
 205/* Values for "inv" field for struct ipt_icmp. */
 206#define IP6T_ICMP_INV   0x01    /* Invert the sense of type/code test */
 207
 208/* The argument to IP6T_SO_GET_INFO */
 209struct ip6t_getinfo
 210{
 211        /* Which table: caller fills this in. */
 212        char name[IP6T_TABLE_MAXNAMELEN];
 213
 214        /* Kernel fills these in. */
 215        /* Which hook entry points are valid: bitmask */
 216        unsigned int valid_hooks;
 217
 218        /* Hook entry points: one per netfilter hook. */
 219        unsigned int hook_entry[NF_INET_NUMHOOKS];
 220
 221        /* Underflow points. */
 222        unsigned int underflow[NF_INET_NUMHOOKS];
 223
 224        /* Number of entries */
 225        unsigned int num_entries;
 226
 227        /* Size of entries. */
 228        unsigned int size;
 229};
 230
 231/* The argument to IP6T_SO_SET_REPLACE. */
 232struct ip6t_replace
 233{
 234        /* Which table. */
 235        char name[IP6T_TABLE_MAXNAMELEN];
 236
 237        /* Which hook entry points are valid: bitmask.  You can't
 238           change this. */
 239        unsigned int valid_hooks;
 240
 241        /* Number of entries */
 242        unsigned int num_entries;
 243
 244        /* Total size of new entries */
 245        unsigned int size;
 246
 247        /* Hook entry points. */
 248        unsigned int hook_entry[NF_INET_NUMHOOKS];
 249
 250        /* Underflow points. */
 251        unsigned int underflow[NF_INET_NUMHOOKS];
 252
 253        /* Information about old entries: */
 254        /* Number of counters (must be equal to current number of entries). */
 255        unsigned int num_counters;
 256        /* The old entries' counters. */
 257        struct xt_counters __user *counters;
 258
 259        /* The entries (hang off end: not really an array). */
 260        struct ip6t_entry entries[0];
 261};
 262
 263/* The argument to IP6T_SO_ADD_COUNTERS. */
 264#define ip6t_counters_info xt_counters_info
 265
 266/* The argument to IP6T_SO_GET_ENTRIES. */
 267struct ip6t_get_entries
 268{
 269        /* Which table: user fills this in. */
 270        char name[IP6T_TABLE_MAXNAMELEN];
 271
 272        /* User fills this in: total entry size. */
 273        unsigned int size;
 274
 275        /* The entries. */
 276        struct ip6t_entry entrytable[0];
 277};
 278
 279/* Standard return verdict, or do jump. */
 280#define IP6T_STANDARD_TARGET XT_STANDARD_TARGET
 281/* Error verdict. */
 282#define IP6T_ERROR_TARGET XT_ERROR_TARGET
 283
 284/* Helper functions */
 285static __inline__ struct ip6t_entry_target *
 286ip6t_get_target(struct ip6t_entry *e)
 287{
 288        return (void *)e + e->target_offset;
 289}
 290
 291/* fn returns 0 to continue iteration */
 292#define IP6T_MATCH_ITERATE(e, fn, args...) \
 293        XT_MATCH_ITERATE(struct ip6t_entry, e, fn, ## args)
 294
 295/* fn returns 0 to continue iteration */
 296#define IP6T_ENTRY_ITERATE(entries, size, fn, args...) \
 297        XT_ENTRY_ITERATE(struct ip6t_entry, entries, size, fn, ## args)
 298
 299/*
 300 *      Main firewall chains definitions and global var's definitions.
 301 */
 302
 303#ifdef __KERNEL__
 304
 305#include <linux/init.h>
 306extern void ip6t_init(void) __init;
 307
 308extern struct xt_table *ip6t_register_table(struct net *net,
 309                                            const struct xt_table *table,
 310                                            const struct ip6t_replace *repl);
 311extern void ip6t_unregister_table(struct xt_table *table);
 312extern unsigned int ip6t_do_table(struct sk_buff *skb,
 313                                  unsigned int hook,
 314                                  const struct net_device *in,
 315                                  const struct net_device *out,
 316                                  struct xt_table *table);
 317
 318/* Check for an extension */
 319extern int ip6t_ext_hdr(u8 nexthdr);
 320/* find specified header and get offset to it */
 321extern int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset,
 322                         int target, unsigned short *fragoff);
 323
 324extern int ip6_masked_addrcmp(const struct in6_addr *addr1,
 325                              const struct in6_addr *mask,
 326                              const struct in6_addr *addr2);
 327
 328#define IP6T_ALIGN(s) XT_ALIGN(s)
 329
 330#ifdef CONFIG_COMPAT
 331#include <net/compat.h>
 332
 333struct compat_ip6t_entry
 334{
 335        struct ip6t_ip6 ipv6;
 336        compat_uint_t nfcache;
 337        u_int16_t target_offset;
 338        u_int16_t next_offset;
 339        compat_uint_t comefrom;
 340        struct compat_xt_counters counters;
 341        unsigned char elems[0];
 342};
 343
 344static inline struct ip6t_entry_target *
 345compat_ip6t_get_target(struct compat_ip6t_entry *e)
 346{
 347        return (void *)e + e->target_offset;
 348}
 349
 350#define COMPAT_IP6T_ALIGN(s)    COMPAT_XT_ALIGN(s)
 351
 352/* fn returns 0 to continue iteration */
 353#define COMPAT_IP6T_MATCH_ITERATE(e, fn, args...) \
 354        XT_MATCH_ITERATE(struct compat_ip6t_entry, e, fn, ## args)
 355
 356/* fn returns 0 to continue iteration */
 357#define COMPAT_IP6T_ENTRY_ITERATE(entries, size, fn, args...) \
 358        XT_ENTRY_ITERATE(struct compat_ip6t_entry, entries, size, fn, ## args)
 359
 360#define COMPAT_IP6T_ENTRY_ITERATE_CONTINUE(entries, size, n, fn, args...) \
 361        XT_ENTRY_ITERATE_CONTINUE(struct compat_ip6t_entry, entries, size, n, \
 362                                  fn, ## args)
 363
 364#endif /* CONFIG_COMPAT */
 365#endif /*__KERNEL__*/
 366#endif /* _IP6_TABLES_H */
 367