release/src-rt-6.x.4708/linux/linux-2.6.36/include/linux/netfilter_ipv4/ip_tables.h

   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 IP 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 _IPTABLES_H
  16 #define _IPTABLES_H
  17
  18 #ifdef __KERNEL__
  19 #include <linux/if.h>
  20 #include <linux/in.h>
  21 #include <linux/ip.h>
  22 #include <linux/skbuff.h>
  23 #endif
  24 #include <linux/types.h>
  25 #include <linux/compiler.h>
  26 #include <linux/netfilter_ipv4.h>
  27
  28 #include <linux/netfilter/x_tables.h>
  29
  30 #define IPT_FUNCTION_MAXNAMELEN XT_FUNCTION_MAXNAMELEN
  31 #define IPT_TABLE_MAXNAMELEN XT_TABLE_MAXNAMELEN
  32 #define ipt_match xt_match
  33 #define ipt_target xt_target
  34 #define ipt_table xt_table
  35 #define ipt_get_revision xt_get_revision
  36
  37 /* Yes, Virginia, you have to zero the padding. */
  38 struct ipt_ip {
  39         /* Source and destination IP addr */
  40         struct in_addr src, dst;
  41         /* Mask for src and dest IP addr */
  42         struct in_addr smsk, dmsk;
  43         char iniface[IFNAMSIZ], outiface[IFNAMSIZ];
  44         unsigned char iniface_mask[IFNAMSIZ], outiface_mask[IFNAMSIZ];
  45
  46         /* Protocol, 0 = ANY */
  47         u_int16_t proto;
  48
  49         /* Flags word */
  50         u_int8_t flags;
  51         /* Inverse flags */
  52         u_int8_t invflags;
  53 };
  54
  55 #define ipt_entry_match xt_entry_match
  56 #define ipt_entry_target xt_entry_target
  57 #define ipt_standard_target xt_standard_target
  58
  59 #define ipt_counters xt_counters
  60
  61 /* Values for "flag" field in struct ipt_ip (general ip structure). */
  62 #define IPT_F_FRAG              0x01    /* Set if rule is a fragment rule */
  63 #define IPT_F_GOTO              0x02    /* Set if jump is a goto */
  64 #define IPT_F_MASK              0x03    /* All possible flag bits mask. */
  65 #define IPT_F_NO_DEF_MATCH      0x80    /* Internal: no default match rules present */
  66
  67 /* Values for "inv" field in struct ipt_ip. */
  68 #define IPT_INV_VIA_IN          0x01    /* Invert the sense of IN IFACE. */
  69 #define IPT_INV_VIA_OUT         0x02    /* Invert the sense of OUT IFACE */
  70 #define IPT_INV_TOS             0x04    /* Invert the sense of TOS. */
  71 #define IPT_INV_SRCIP           0x08    /* Invert the sense of SRC IP. */
  72 #define IPT_INV_DSTIP           0x10    /* Invert the sense of DST OP. */
  73 #define IPT_INV_FRAG            0x20    /* Invert the sense of FRAG. */
  74 #define IPT_INV_PROTO           XT_INV_PROTO
  75 #define IPT_INV_MASK            0x7F    /* All possible flag bits mask. */
  76
  77 /* This structure defines each of the firewall rules.  Consists of 3
  78    parts which are 1) general IP header stuff 2) match specific
  79    stuff 3) the target to perform if the rule matches */
  80 struct ipt_entry {
  81         struct ipt_ip ip;
  82
  83         /* Mark with fields that we care about. */
  84         unsigned int nfcache;
  85
  86         /* Size of ipt_entry + matches */
  87         u_int16_t target_offset;
  88         /* Size of ipt_entry + matches + target */
  89         u_int16_t next_offset;
  90
  91         /* Back pointer */
  92         unsigned int comefrom;
  93
  94         /* Packet and byte counters. */
  95         struct xt_counters counters;
  96
  97         /* The matches (if any), then the target. */
  98         unsigned char elems[0];
  99 };
 100
 101 /*
 102  * New IP firewall options for [gs]etsockopt at the RAW IP level.
 103  * Unlike BSD Linux inherits IP options so you don't have to use a raw
 104  * socket for this. Instead we check rights in the calls.
 105  *
 106  * ATTENTION: check linux/in.h before adding new number here.
 107  */
 108 #define IPT_BASE_CTL            64
 109
 110 #define IPT_SO_SET_REPLACE      (IPT_BASE_CTL)
 111 #define IPT_SO_SET_ADD_COUNTERS (IPT_BASE_CTL + 1)
 112 #define IPT_SO_SET_MAX          IPT_SO_SET_ADD_COUNTERS
 113
 114 #define IPT_SO_GET_INFO                 (IPT_BASE_CTL)
 115 #define IPT_SO_GET_ENTRIES              (IPT_BASE_CTL + 1)
 116 #define IPT_SO_GET_REVISION_MATCH       (IPT_BASE_CTL + 2)
 117 #define IPT_SO_GET_REVISION_TARGET      (IPT_BASE_CTL + 3)
 118 #define IPT_SO_GET_MAX                  IPT_SO_GET_REVISION_TARGET
 119
 120 #define IPT_CONTINUE XT_CONTINUE
 121 #define IPT_RETURN XT_RETURN
 122
 123 #include <linux/netfilter/xt_tcpudp.h>
 124 #define ipt_udp xt_udp
 125 #define ipt_tcp xt_tcp
 126
 127 #define IPT_TCP_INV_SRCPT       XT_TCP_INV_SRCPT
 128 #define IPT_TCP_INV_DSTPT       XT_TCP_INV_DSTPT
 129 #define IPT_TCP_INV_FLAGS       XT_TCP_INV_FLAGS
 130 #define IPT_TCP_INV_OPTION      XT_TCP_INV_OPTION
 131 #define IPT_TCP_INV_MASK        XT_TCP_INV_MASK
 132
 133 #define IPT_UDP_INV_SRCPT       XT_UDP_INV_SRCPT
 134 #define IPT_UDP_INV_DSTPT       XT_UDP_INV_DSTPT
 135 #define IPT_UDP_INV_MASK        XT_UDP_INV_MASK
 136
 137 /* ICMP matching stuff */
 138 struct ipt_icmp {
 139         u_int8_t type;                          /* type to match */
 140         u_int8_t code[2];                       /* range of code */
 141         u_int8_t invflags;                      /* Inverse flags */
 142 };
 143
 144 /* Values for "inv" field for struct ipt_icmp. */
 145 #define IPT_ICMP_INV    0x01    /* Invert the sense of type/code test */
 146
 147 /* The argument to IPT_SO_GET_INFO */
 148 struct ipt_getinfo {
 149         /* Which table: caller fills this in. */
 150         char name[IPT_TABLE_MAXNAMELEN];
 151
 152         /* Kernel fills these in. */
 153         /* Which hook entry points are valid: bitmask */
 154         unsigned int valid_hooks;
 155
 156         /* Hook entry points: one per netfilter hook. */
 157         unsigned int hook_entry[NF_INET_NUMHOOKS];
 158
 159         /* Underflow points. */
 160         unsigned int underflow[NF_INET_NUMHOOKS];
 161
 162         /* Number of entries */
 163         unsigned int num_entries;
 164
 165         /* Size of entries. */
 166         unsigned int size;
 167 };
 168
 169 /* The argument to IPT_SO_SET_REPLACE. */
 170 struct ipt_replace {
 171         /* Which table. */
 172         char name[IPT_TABLE_MAXNAMELEN];
 173
 174         /* Which hook entry points are valid: bitmask.  You can't
 175            change this. */
 176         unsigned int valid_hooks;
 177
 178         /* Number of entries */
 179         unsigned int num_entries;
 180
 181         /* Total size of new entries */
 182         unsigned int size;
 183
 184         /* Hook entry points. */
 185         unsigned int hook_entry[NF_INET_NUMHOOKS];
 186
 187         /* Underflow points. */
 188         unsigned int underflow[NF_INET_NUMHOOKS];
 189
 190         /* Information about old entries: */
 191         /* Number of counters (must be equal to current number of entries). */
 192         unsigned int num_counters;
 193         /* The old entries' counters. */
 194         struct xt_counters __user *counters;
 195
 196         /* The entries (hang off end: not really an array). */
 197         struct ipt_entry entries[0];
 198 };
 199
 200 /* The argument to IPT_SO_ADD_COUNTERS. */
 201 #define ipt_counters_info xt_counters_info
 202
 203 /* The argument to IPT_SO_GET_ENTRIES. */
 204 struct ipt_get_entries {
 205         /* Which table: user fills this in. */
 206         char name[IPT_TABLE_MAXNAMELEN];
 207
 208         /* User fills this in: total entry size. */
 209         unsigned int size;
 210
 211         /* The entries. */
 212         struct ipt_entry entrytable[0];
 213 };
 214
 215 /* Standard return verdict, or do jump. */
 216 #define IPT_STANDARD_TARGET XT_STANDARD_TARGET
 217 /* Error verdict. */
 218 #define IPT_ERROR_TARGET XT_ERROR_TARGET
 219
 220 /* Helper functions */
 221 static __inline__ struct ipt_entry_target *
 222 ipt_get_target(struct ipt_entry *e)
 223 {
 224         return (void *)e + e->target_offset;
 225 }
 226
 227 #ifndef __KERNEL__
 228 /* fn returns 0 to continue iteration */
 229 #define IPT_MATCH_ITERATE(e, fn, args...) \
 230         XT_MATCH_ITERATE(struct ipt_entry, e, fn, ## args)
 231
 232 /* fn returns 0 to continue iteration */
 233 #define IPT_ENTRY_ITERATE(entries, size, fn, args...) \
 234         XT_ENTRY_ITERATE(struct ipt_entry, entries, size, fn, ## args)
 235 #endif
 236
 237 /*
 238  *      Main firewall chains definitions and global var's definitions.
 239  */
 240 #ifdef __KERNEL__
 241
 242 #include <linux/init.h>
 243 extern void ipt_init(void) __init;
 244
 245 extern struct xt_table *ipt_register_table(struct net *net,
 246                                            const struct xt_table *table,
 247                                            const struct ipt_replace *repl);
 248 extern void ipt_unregister_table(struct net *net, struct xt_table *table);
 249
 250 /* Standard entry. */
 251 struct ipt_standard {
 252         struct ipt_entry entry;
 253         struct ipt_standard_target target;
 254 };
 255
 256 struct ipt_error_target {
 257         struct ipt_entry_target target;
 258         char errorname[IPT_FUNCTION_MAXNAMELEN];
 259 };
 260
 261 struct ipt_error {
 262         struct ipt_entry entry;
 263         struct ipt_error_target target;
 264 };
 265
 266 #define IPT_ENTRY_INIT(__size)                                                 \
 267 {                                                                              \
 268         .target_offset  = sizeof(struct ipt_entry),                            \
 269         .next_offset    = (__size),                                            \
 270 }
 271
 272 #define IPT_STANDARD_INIT(__verdict)                                           \
 273 {                                                                              \
 274         .entry          = IPT_ENTRY_INIT(sizeof(struct ipt_standard)),         \
 275         .target         = XT_TARGET_INIT(IPT_STANDARD_TARGET,                  \
 276                                          sizeof(struct xt_standard_target)),   \
 277         .target.verdict = -(__verdict) - 1,                                    \
 278 }
 279
 280 #define IPT_ERROR_INIT                                                         \
 281 {                                                                              \
 282         .entry          = IPT_ENTRY_INIT(sizeof(struct ipt_error)),            \
 283         .target         = XT_TARGET_INIT(IPT_ERROR_TARGET,                     \
 284                                          sizeof(struct ipt_error_target)),     \
 285         .target.errorname = "ERROR",                                           \
 286 }
 287
 288 extern void *ipt_alloc_initial_table(const struct xt_table *);
 289 extern unsigned int ipt_do_table(struct sk_buff *skb,
 290                                  unsigned int hook,
 291                                  const struct net_device *in,
 292                                  const struct net_device *out,
 293                                  struct xt_table *table);
 294
 295 #define IPT_ALIGN(s) XT_ALIGN(s)
 296
 297 #ifdef CONFIG_COMPAT
 298 #include <net/compat.h>
 299
 300 struct compat_ipt_entry {
 301         struct ipt_ip ip;
 302         compat_uint_t nfcache;
 303         u_int16_t target_offset;
 304         u_int16_t next_offset;
 305         compat_uint_t comefrom;
 306         struct compat_xt_counters counters;
 307         unsigned char elems[0];
 308 };
 309
 310 /* Helper functions */
 311 static inline struct ipt_entry_target *
 312 compat_ipt_get_target(struct compat_ipt_entry *e)
 313 {
 314         return (void *)e + e->target_offset;
 315 }
 316
 317 #define COMPAT_IPT_ALIGN(s)     COMPAT_XT_ALIGN(s)
 318
 319 #endif /* CONFIG_COMPAT */
 320 #endif /*__KERNEL__*/
 321 #endif /* _IPTABLES_H */