release/src-rt-6.x.4708/linux/linux-2.6.36/include/linux/netfilter_ipv6/ip6_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 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. */
  39 struct 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 */
  91 struct ip6t_entry {
  92         struct ip6t_ip6 ipv6;
  93
  94         /* Mark with fields that we care about. */
  95         unsigned int nfcache;
  96
  97         /* Size of ipt_entry + matches */
  98         u_int16_t target_offset;
  99         /* Size of ipt_entry + matches + target */
 100         u_int16_t next_offset;
 101
 102         /* Back pointer */
 103         unsigned int comefrom;
 104
 105         /* Packet and byte counters. */
 106         struct xt_counters counters;
 107
 108         /* The matches (if any), then the target. */
 109         unsigned char elems[0];
 110 };
 111
 112 /* Standard entry */
 113 struct ip6t_standard {
 114         struct ip6t_entry entry;
 115         struct ip6t_standard_target target;
 116 };
 117
 118 struct ip6t_error_target {
 119         struct ip6t_entry_target target;
 120         char errorname[IP6T_FUNCTION_MAXNAMELEN];
 121 };
 122
 123 struct ip6t_error {
 124         struct ip6t_entry entry;
 125         struct ip6t_error_target target;
 126 };
 127
 128 #define IP6T_ENTRY_INIT(__size)                                                \
 129 {                                                                              \
 130         .target_offset  = sizeof(struct ip6t_entry),                           \
 131         .next_offset    = (__size),                                            \
 132 }
 133
 134 #define IP6T_STANDARD_INIT(__verdict)                                          \
 135 {                                                                              \
 136         .entry          = IP6T_ENTRY_INIT(sizeof(struct ip6t_standard)),       \
 137         .target         = XT_TARGET_INIT(IP6T_STANDARD_TARGET,                 \
 138                                          sizeof(struct ip6t_standard_target)), \
 139         .target.verdict = -(__verdict) - 1,                                    \
 140 }
 141
 142 #define IP6T_ERROR_INIT                                                        \
 143 {                                                                              \
 144         .entry          = IP6T_ENTRY_INIT(sizeof(struct ip6t_error)),          \
 145         .target         = XT_TARGET_INIT(IP6T_ERROR_TARGET,                    \
 146                                          sizeof(struct ip6t_error_target)),    \
 147         .target.errorname = "ERROR",                                           \
 148 }
 149
 150 /*
 151  * New IP firewall options for [gs]etsockopt at the RAW IP level.
 152  * Unlike BSD Linux inherits IP options so you don't have to use
 153  * a raw socket for this. Instead we check rights in the calls.
 154  *
 155  * ATTENTION: check linux/in6.h before adding new number here.
 156  */
 157 #define IP6T_BASE_CTL                   64
 158
 159 #define IP6T_SO_SET_REPLACE             (IP6T_BASE_CTL)
 160 #define IP6T_SO_SET_ADD_COUNTERS        (IP6T_BASE_CTL + 1)
 161 #define IP6T_SO_SET_MAX                 IP6T_SO_SET_ADD_COUNTERS
 162
 163 #define IP6T_SO_GET_INFO                (IP6T_BASE_CTL)
 164 #define IP6T_SO_GET_ENTRIES             (IP6T_BASE_CTL + 1)
 165 #define IP6T_SO_GET_REVISION_MATCH      (IP6T_BASE_CTL + 4)
 166 #define IP6T_SO_GET_REVISION_TARGET     (IP6T_BASE_CTL + 5)
 167 #define IP6T_SO_GET_MAX                 IP6T_SO_GET_REVISION_TARGET
 168
 169 /* CONTINUE verdict for targets */
 170 #define IP6T_CONTINUE XT_CONTINUE
 171
 172 /* For standard target */
 173 #define IP6T_RETURN XT_RETURN
 174
 175 /* TCP/UDP matching stuff */
 176 #include <linux/netfilter/xt_tcpudp.h>
 177
 178 #define ip6t_tcp xt_tcp
 179 #define ip6t_udp xt_udp
 180
 181 /* Values for "inv" field in struct ipt_tcp. */
 182 #define IP6T_TCP_INV_SRCPT      XT_TCP_INV_SRCPT
 183 #define IP6T_TCP_INV_DSTPT      XT_TCP_INV_DSTPT
 184 #define IP6T_TCP_INV_FLAGS      XT_TCP_INV_FLAGS
 185 #define IP6T_TCP_INV_OPTION     XT_TCP_INV_OPTION
 186 #define IP6T_TCP_INV_MASK       XT_TCP_INV_MASK
 187
 188 /* Values for "invflags" field in struct ipt_udp. */
 189 #define IP6T_UDP_INV_SRCPT      XT_UDP_INV_SRCPT
 190 #define IP6T_UDP_INV_DSTPT      XT_UDP_INV_DSTPT
 191 #define IP6T_UDP_INV_MASK       XT_UDP_INV_MASK
 192
 193 /* ICMP matching stuff */
 194 struct ip6t_icmp {
 195         u_int8_t type;                          /* type to match */
 196         u_int8_t code[2];                       /* range of code */
 197         u_int8_t invflags;                      /* Inverse flags */
 198 };
 199
 200 /* Values for "inv" field for struct ipt_icmp. */
 201 #define IP6T_ICMP_INV   0x01    /* Invert the sense of type/code test */
 202
 203 /* The argument to IP6T_SO_GET_INFO */
 204 struct ip6t_getinfo {
 205         /* Which table: caller fills this in. */
 206         char name[IP6T_TABLE_MAXNAMELEN];
 207
 208         /* Kernel fills these in. */
 209         /* Which hook entry points are valid: bitmask */
 210         unsigned int valid_hooks;
 211
 212         /* Hook entry points: one per netfilter hook. */
 213         unsigned int hook_entry[NF_INET_NUMHOOKS];
 214
 215         /* Underflow points. */
 216         unsigned int underflow[NF_INET_NUMHOOKS];
 217
 218         /* Number of entries */
 219         unsigned int num_entries;
 220
 221         /* Size of entries. */
 222         unsigned int size;
 223 };
 224
 225 /* The argument to IP6T_SO_SET_REPLACE. */
 226 struct ip6t_replace {
 227         /* Which table. */
 228         char name[IP6T_TABLE_MAXNAMELEN];
 229
 230         /* Which hook entry points are valid: bitmask.  You can't
 231            change this. */
 232         unsigned int valid_hooks;
 233
 234         /* Number of entries */
 235         unsigned int num_entries;
 236
 237         /* Total size of new entries */
 238         unsigned int size;
 239
 240         /* Hook entry points. */
 241         unsigned int hook_entry[NF_INET_NUMHOOKS];
 242
 243         /* Underflow points. */
 244         unsigned int underflow[NF_INET_NUMHOOKS];
 245
 246         /* Information about old entries: */
 247         /* Number of counters (must be equal to current number of entries). */
 248         unsigned int num_counters;
 249         /* The old entries' counters. */
 250         struct xt_counters __user *counters;
 251
 252         /* The entries (hang off end: not really an array). */
 253         struct ip6t_entry entries[0];
 254 };
 255
 256 /* The argument to IP6T_SO_ADD_COUNTERS. */
 257 #define ip6t_counters_info xt_counters_info
 258
 259 /* The argument to IP6T_SO_GET_ENTRIES. */
 260 struct ip6t_get_entries {
 261         /* Which table: user fills this in. */
 262         char name[IP6T_TABLE_MAXNAMELEN];
 263
 264         /* User fills this in: total entry size. */
 265         unsigned int size;
 266
 267         /* The entries. */
 268         struct ip6t_entry entrytable[0];
 269 };
 270
 271 /* Standard return verdict, or do jump. */
 272 #define IP6T_STANDARD_TARGET XT_STANDARD_TARGET
 273 /* Error verdict. */
 274 #define IP6T_ERROR_TARGET XT_ERROR_TARGET
 275
 276 /* Helper functions */
 277 static __inline__ struct ip6t_entry_target *
 278 ip6t_get_target(struct ip6t_entry *e)
 279 {
 280         return (void *)e + e->target_offset;
 281 }
 282
 283 #ifndef __KERNEL__
 284 /* fn returns 0 to continue iteration */
 285 #define IP6T_MATCH_ITERATE(e, fn, args...) \
 286         XT_MATCH_ITERATE(struct ip6t_entry, e, fn, ## args)
 287
 288 /* fn returns 0 to continue iteration */
 289 #define IP6T_ENTRY_ITERATE(entries, size, fn, args...) \
 290         XT_ENTRY_ITERATE(struct ip6t_entry, entries, size, fn, ## args)
 291 #endif
 292
 293 /*
 294  *      Main firewall chains definitions and global var's definitions.
 295  */
 296
 297 #ifdef __KERNEL__
 298
 299 #include <linux/init.h>
 300 extern void ip6t_init(void) __init;
 301
 302 extern void *ip6t_alloc_initial_table(const struct xt_table *);
 303 extern struct xt_table *ip6t_register_table(struct net *net,
 304                                             const struct xt_table *table,
 305                                             const struct ip6t_replace *repl);
 306 extern void ip6t_unregister_table(struct net *net, struct xt_table *table);
 307 extern unsigned int ip6t_do_table(struct sk_buff *skb,
 308                                   unsigned int hook,
 309                                   const struct net_device *in,
 310                                   const struct net_device *out,
 311                                   struct xt_table *table);
 312
 313 /* Check for an extension */
 314 extern int ip6t_ext_hdr(u8 nexthdr);
 315 /* find specified header and get offset to it */
 316 extern int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset,
 317                          int target, unsigned short *fragoff);
 318
 319 #define IP6T_ALIGN(s) XT_ALIGN(s)
 320
 321 #ifdef CONFIG_COMPAT
 322 #include <net/compat.h>
 323
 324 struct compat_ip6t_entry {
 325         struct ip6t_ip6 ipv6;
 326         compat_uint_t nfcache;
 327         u_int16_t target_offset;
 328         u_int16_t next_offset;
 329         compat_uint_t comefrom;
 330         struct compat_xt_counters counters;
 331         unsigned char elems[0];
 332 };
 333
 334 static inline struct ip6t_entry_target *
 335 compat_ip6t_get_target(struct compat_ip6t_entry *e)
 336 {
 337         return (void *)e + e->target_offset;
 338 }
 339
 340 #define COMPAT_IP6T_ALIGN(s)    COMPAT_XT_ALIGN(s)
 341
 342 #endif /* CONFIG_COMPAT */
 343 #endif /*__KERNEL__*/
 344 #endif /* _IP6_TABLES_H */