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#ifndef __KERNEL__
  31#define IP6T_FUNCTION_MAXNAMELEN XT_FUNCTION_MAXNAMELEN
  32#define IP6T_TABLE_MAXNAMELEN XT_TABLE_MAXNAMELEN
  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#define ip6t_entry_match xt_entry_match
  38#define ip6t_entry_target xt_entry_target
  39#define ip6t_standard_target xt_standard_target
  40#define ip6t_error_target xt_error_target
  41#define ip6t_counters xt_counters
  42#define IP6T_CONTINUE XT_CONTINUE
  43#define IP6T_RETURN XT_RETURN
  44
  45/* Pre-iptables-1.4.0 */
  46#include <linux/netfilter/xt_tcpudp.h>
  47#define ip6t_tcp xt_tcp
  48#define ip6t_udp xt_udp
  49#define IP6T_TCP_INV_SRCPT      XT_TCP_INV_SRCPT
  50#define IP6T_TCP_INV_DSTPT      XT_TCP_INV_DSTPT
  51#define IP6T_TCP_INV_FLAGS      XT_TCP_INV_FLAGS
  52#define IP6T_TCP_INV_OPTION     XT_TCP_INV_OPTION
  53#define IP6T_TCP_INV_MASK       XT_TCP_INV_MASK
  54#define IP6T_UDP_INV_SRCPT      XT_UDP_INV_SRCPT
  55#define IP6T_UDP_INV_DSTPT      XT_UDP_INV_DSTPT
  56#define IP6T_UDP_INV_MASK       XT_UDP_INV_MASK
  57
  58#define ip6t_counters_info xt_counters_info
  59#define IP6T_STANDARD_TARGET XT_STANDARD_TARGET
  60#define IP6T_ERROR_TARGET XT_ERROR_TARGET
  61#define IP6T_MATCH_ITERATE(e, fn, args...) \
  62        XT_MATCH_ITERATE(struct ip6t_entry, e, fn, ## args)
  63#define IP6T_ENTRY_ITERATE(entries, size, fn, args...) \
  64        XT_ENTRY_ITERATE(struct ip6t_entry, entries, size, fn, ## args)
  65#endif
  66
  67/* Yes, Virginia, you have to zero the padding. */
  68struct ip6t_ip6 {
  69        /* Source and destination IP6 addr */
  70        struct in6_addr src, dst;               
  71        /* Mask for src and dest IP6 addr */
  72        struct in6_addr smsk, dmsk;
  73        char iniface[IFNAMSIZ], outiface[IFNAMSIZ];
  74        unsigned char iniface_mask[IFNAMSIZ], outiface_mask[IFNAMSIZ];
  75
  76        /* Upper protocol number
  77         * - The allowed value is 0 (any) or protocol number of last parsable
  78         *   header, which is 50 (ESP), 59 (No Next Header), 135 (MH), or
  79         *   the non IPv6 extension headers.
  80         * - The protocol numbers of IPv6 extension headers except of ESP and
  81         *   MH do not match any packets.
  82         * - You also need to set IP6T_FLAGS_PROTO to "flags" to check protocol.
  83         */
  84        u_int16_t proto;
  85        /* TOS to match iff flags & IP6T_F_TOS */
  86        u_int8_t tos;
  87
  88        /* Flags word */
  89        u_int8_t flags;
  90        /* Inverse flags */
  91        u_int8_t invflags;
  92};
  93
  94/* Values for "flag" field in struct ip6t_ip6 (general ip6 structure). */
  95#define IP6T_F_PROTO            0x01    /* Set if rule cares about upper 
  96                                           protocols */
  97#define IP6T_F_TOS              0x02    /* Match the TOS. */
  98#define IP6T_F_GOTO             0x04    /* Set if jump is a goto */
  99#define IP6T_F_MASK             0x07    /* All possible flag bits mask. */
 100
 101/* Values for "inv" field in struct ip6t_ip6. */
 102#define IP6T_INV_VIA_IN         0x01    /* Invert the sense of IN IFACE. */
 103#define IP6T_INV_VIA_OUT                0x02    /* Invert the sense of OUT IFACE */
 104#define IP6T_INV_TOS            0x04    /* Invert the sense of TOS. */
 105#define IP6T_INV_SRCIP          0x08    /* Invert the sense of SRC IP. */
 106#define IP6T_INV_DSTIP          0x10    /* Invert the sense of DST OP. */
 107#define IP6T_INV_FRAG           0x20    /* Invert the sense of FRAG. */
 108#define IP6T_INV_PROTO          XT_INV_PROTO
 109#define IP6T_INV_MASK           0x7F    /* All possible flag bits mask. */
 110
 111/* This structure defines each of the firewall rules.  Consists of 3
 112   parts which are 1) general IP header stuff 2) match specific
 113   stuff 3) the target to perform if the rule matches */
 114struct ip6t_entry {
 115        struct ip6t_ip6 ipv6;
 116
 117        /* Mark with fields that we care about. */
 118        unsigned int nfcache;
 119
 120        /* Size of ipt_entry + matches */
 121        u_int16_t target_offset;
 122        /* Size of ipt_entry + matches + target */
 123        u_int16_t next_offset;
 124
 125        /* Back pointer */
 126        unsigned int comefrom;
 127
 128        /* Packet and byte counters. */
 129        struct xt_counters counters;
 130
 131        /* The matches (if any), then the target. */
 132        unsigned char elems[0];
 133};
 134
 135/* Standard entry */
 136struct ip6t_standard {
 137        struct ip6t_entry entry;
 138        struct xt_standard_target target;
 139};
 140
 141struct ip6t_error {
 142        struct ip6t_entry entry;
 143        struct xt_error_target target;
 144};
 145
 146#define IP6T_ENTRY_INIT(__size)                                                \
 147{                                                                              \
 148        .target_offset  = sizeof(struct ip6t_entry),                           \
 149        .next_offset    = (__size),                                            \
 150}
 151
 152#define IP6T_STANDARD_INIT(__verdict)                                          \
 153{                                                                              \
 154        .entry          = IP6T_ENTRY_INIT(sizeof(struct ip6t_standard)),       \
 155        .target         = XT_TARGET_INIT(XT_STANDARD_TARGET,                   \
 156                                         sizeof(struct xt_standard_target)),   \
 157        .target.verdict = -(__verdict) - 1,                                    \
 158}
 159
 160#define IP6T_ERROR_INIT                                                        \
 161{                                                                              \
 162        .entry          = IP6T_ENTRY_INIT(sizeof(struct ip6t_error)),          \
 163        .target         = XT_TARGET_INIT(XT_ERROR_TARGET,                      \
 164                                         sizeof(struct xt_error_target)),      \
 165        .target.errorname = "ERROR",                                           \
 166}
 167
 168/*
 169 * New IP firewall options for [gs]etsockopt at the RAW IP level.
 170 * Unlike BSD Linux inherits IP options so you don't have to use
 171 * a raw socket for this. Instead we check rights in the calls.
 172 *
 173 * ATTENTION: check linux/in6.h before adding new number here.
 174 */
 175#define IP6T_BASE_CTL                   64
 176
 177#define IP6T_SO_SET_REPLACE             (IP6T_BASE_CTL)
 178#define IP6T_SO_SET_ADD_COUNTERS        (IP6T_BASE_CTL + 1)
 179#define IP6T_SO_SET_MAX                 IP6T_SO_SET_ADD_COUNTERS
 180
 181#define IP6T_SO_GET_INFO                (IP6T_BASE_CTL)
 182#define IP6T_SO_GET_ENTRIES             (IP6T_BASE_CTL + 1)
 183#define IP6T_SO_GET_REVISION_MATCH      (IP6T_BASE_CTL + 4)
 184#define IP6T_SO_GET_REVISION_TARGET     (IP6T_BASE_CTL + 5)
 185#define IP6T_SO_GET_MAX                 IP6T_SO_GET_REVISION_TARGET
 186
 187/* ICMP matching stuff */
 188struct ip6t_icmp {
 189        u_int8_t type;                          /* type to match */
 190        u_int8_t code[2];                       /* range of code */
 191        u_int8_t invflags;                      /* Inverse flags */
 192};
 193
 194/* Values for "inv" field for struct ipt_icmp. */
 195#define IP6T_ICMP_INV   0x01    /* Invert the sense of type/code test */
 196
 197/* The argument to IP6T_SO_GET_INFO */
 198struct ip6t_getinfo {
 199        /* Which table: caller fills this in. */
 200        char name[XT_TABLE_MAXNAMELEN];
 201
 202        /* Kernel fills these in. */
 203        /* Which hook entry points are valid: bitmask */
 204        unsigned int valid_hooks;
 205
 206        /* Hook entry points: one per netfilter hook. */
 207        unsigned int hook_entry[NF_INET_NUMHOOKS];
 208
 209        /* Underflow points. */
 210        unsigned int underflow[NF_INET_NUMHOOKS];
 211
 212        /* Number of entries */
 213        unsigned int num_entries;
 214
 215        /* Size of entries. */
 216        unsigned int size;
 217};
 218
 219/* The argument to IP6T_SO_SET_REPLACE. */
 220struct ip6t_replace {
 221        /* Which table. */
 222        char name[XT_TABLE_MAXNAMELEN];
 223
 224        /* Which hook entry points are valid: bitmask.  You can't
 225           change this. */
 226        unsigned int valid_hooks;
 227
 228        /* Number of entries */
 229        unsigned int num_entries;
 230
 231        /* Total size of new entries */
 232        unsigned int size;
 233
 234        /* Hook entry points. */
 235        unsigned int hook_entry[NF_INET_NUMHOOKS];
 236
 237        /* Underflow points. */
 238        unsigned int underflow[NF_INET_NUMHOOKS];
 239
 240        /* Information about old entries: */
 241        /* Number of counters (must be equal to current number of entries). */
 242        unsigned int num_counters;
 243        /* The old entries' counters. */
 244        struct xt_counters __user *counters;
 245
 246        /* The entries (hang off end: not really an array). */
 247        struct ip6t_entry entries[0];
 248};
 249
 250/* The argument to IP6T_SO_GET_ENTRIES. */
 251struct ip6t_get_entries {
 252        /* Which table: user fills this in. */
 253        char name[XT_TABLE_MAXNAMELEN];
 254
 255        /* User fills this in: total entry size. */
 256        unsigned int size;
 257
 258        /* The entries. */
 259        struct ip6t_entry entrytable[0];
 260};
 261
 262/* Helper functions */
 263static __inline__ struct xt_entry_target *
 264ip6t_get_target(struct ip6t_entry *e)
 265{
 266        return (void *)e + e->target_offset;
 267}
 268
 269/*
 270 *      Main firewall chains definitions and global var's definitions.
 271 */
 272
 273#ifdef __KERNEL__
 274
 275#include <linux/init.h>
 276extern void ip6t_init(void) __init;
 277
 278extern void *ip6t_alloc_initial_table(const struct xt_table *);
 279extern struct xt_table *ip6t_register_table(struct net *net,
 280                                            const struct xt_table *table,
 281                                            const struct ip6t_replace *repl);
 282extern void ip6t_unregister_table(struct net *net, struct xt_table *table);
 283extern unsigned int ip6t_do_table(struct sk_buff *skb,
 284                                  unsigned int hook,
 285                                  const struct net_device *in,
 286                                  const struct net_device *out,
 287                                  struct xt_table *table);
 288
 289/* Check for an extension */
 290extern int ip6t_ext_hdr(u8 nexthdr);
 291/* find specified header and get offset to it */
 292extern int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset,
 293                         int target, unsigned short *fragoff);
 294
 295#ifdef CONFIG_COMPAT
 296#include <net/compat.h>
 297
 298struct compat_ip6t_entry {
 299        struct ip6t_ip6 ipv6;
 300        compat_uint_t nfcache;
 301        u_int16_t target_offset;
 302        u_int16_t next_offset;
 303        compat_uint_t comefrom;
 304        struct compat_xt_counters counters;
 305        unsigned char elems[0];
 306};
 307
 308static inline struct xt_entry_target *
 309compat_ip6t_get_target(struct compat_ip6t_entry *e)
 310{
 311        return (void *)e + e->target_offset;
 312}
 313
 314#endif /* CONFIG_COMPAT */
 315#endif /*__KERNEL__*/
 316#endif /* _IP6_TABLES_H */
 317