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/types.h>
  21 #include <linux/in6.h>
  22 #include <linux/ipv6.h>
  23 #include <linux/skbuff.h>
  24 #endif
  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         /* ARGH, HopByHop uses 0, so can't do 0 = ANY,
  48            instead IP6T_F_NOPROTO must be set */
  49         u_int16_t proto;
  50         /* TOS to match iff flags & IP6T_F_TOS */
  51         u_int8_t tos;
  52
  53         /* Flags word */
  54         u_int8_t flags;
  55         /* Inverse flags */
  56         u_int8_t invflags;
  57 };
  58
  59 #define ip6t_entry_match xt_entry_match
  60 #define ip6t_entry_target xt_entry_target
  61 #define ip6t_standard_target xt_standard_target
  62
  63 #define ip6t_counters   xt_counters
  64
  65 /* Values for "flag" field in struct ip6t_ip6 (general ip6 structure). */
  66 #define IP6T_F_PROTO            0x01    /* Set if rule cares about upper
  67                                            protocols */
  68 #define IP6T_F_TOS              0x02    /* Match the TOS. */
  69 #define IP6T_F_GOTO             0x04    /* Set if jump is a goto */
  70 #define IP6T_F_MASK             0x07    /* All possible flag bits mask. */
  71
  72 /* Values for "inv" field in struct ip6t_ip6. */
  73 #define IP6T_INV_VIA_IN         0x01    /* Invert the sense of IN IFACE. */
  74 #define IP6T_INV_VIA_OUT                0x02    /* Invert the sense of OUT IFACE */
  75 #define IP6T_INV_TOS            0x04    /* Invert the sense of TOS. */
  76 #define IP6T_INV_SRCIP          0x08    /* Invert the sense of SRC IP. */
  77 #define IP6T_INV_DSTIP          0x10    /* Invert the sense of DST OP. */
  78 #define IP6T_INV_FRAG           0x20    /* Invert the sense of FRAG. */
  79 #define IP6T_INV_PROTO          XT_INV_PROTO
  80 #define IP6T_INV_MASK           0x7F    /* All possible flag bits mask. */
  81
  82 /* This structure defines each of the firewall rules.  Consists of 3
  83    parts which are 1) general IP header stuff 2) match specific
  84    stuff 3) the target to perform if the rule matches */
  85 struct ip6t_entry
  86 {
  87         struct ip6t_ip6 ipv6;
  88
  89         /* Mark with fields that we care about. */
  90         unsigned int nfcache;
  91
  92         /* Size of ipt_entry + matches */
  93         u_int16_t target_offset;
  94         /* Size of ipt_entry + matches + target */
  95         u_int16_t next_offset;
  96
  97         /* Back pointer */
  98         unsigned int comefrom;
  99
 100         /* Packet and byte counters. */
 101         struct xt_counters counters;
 102
 103         /* The matches (if any), then the target. */
 104         unsigned char elems[0];
 105 };
 106
 107 /*
 108  * New IP firewall options for [gs]etsockopt at the RAW IP level.
 109  * Unlike BSD Linux inherits IP options so you don't have to use
 110  * a raw socket for this. Instead we check rights in the calls. */
 111 #define IP6T_BASE_CTL                   XT_BASE_CTL
 112
 113 #define IP6T_SO_SET_REPLACE             XT_SO_SET_REPLACE
 114 #define IP6T_SO_SET_ADD_COUNTERS        XT_SO_SET_ADD_COUNTERS
 115 #define IP6T_SO_SET_MAX                 XT_SO_SET_MAX
 116
 117 #define IP6T_SO_GET_INFO                XT_SO_GET_INFO
 118 #define IP6T_SO_GET_ENTRIES             XT_SO_GET_ENTRIES
 119 #define IP6T_SO_GET_REVISION_MATCH      XT_SO_GET_REVISION_MATCH
 120 #define IP6T_SO_GET_REVISION_TARGET     XT_SO_GET_REVISION_TARGET
 121 #define IP6T_SO_GET_MAX                 XT_SO_GET_REVISION_TARGET
 122
 123 /* CONTINUE verdict for targets */
 124 #define IP6T_CONTINUE XT_CONTINUE
 125
 126 /* For standard target */
 127 #define IP6T_RETURN XT_RETURN
 128
 129 /* TCP/UDP matching stuff */
 130 #include <linux/netfilter/xt_tcpudp.h>
 131
 132 #define ip6t_tcp xt_tcp
 133 #define ip6t_udp xt_udp
 134
 135 /* Values for "inv" field in struct ipt_tcp. */
 136 #define IP6T_TCP_INV_SRCPT      XT_TCP_INV_SRCPT
 137 #define IP6T_TCP_INV_DSTPT      XT_TCP_INV_DSTPT
 138 #define IP6T_TCP_INV_FLAGS      XT_TCP_INV_FLAGS
 139 #define IP6T_TCP_INV_OPTION     XT_TCP_INV_OPTION
 140 #define IP6T_TCP_INV_MASK       XT_TCP_INV_MASK
 141
 142 /* Values for "invflags" field in struct ipt_udp. */
 143 #define IP6T_UDP_INV_SRCPT      XT_UDP_INV_SRCPT
 144 #define IP6T_UDP_INV_DSTPT      XT_UDP_INV_DSTPT
 145 #define IP6T_UDP_INV_MASK       XT_UDP_INV_MASK
 146
 147 /* ICMP matching stuff */
 148 struct ip6t_icmp
 149 {
 150         u_int8_t type;                          /* type to match */
 151         u_int8_t code[2];                       /* range of code */
 152         u_int8_t invflags;                      /* Inverse flags */
 153 };
 154
 155 /* Values for "inv" field for struct ipt_icmp. */
 156 #define IP6T_ICMP_INV   0x01    /* Invert the sense of type/code test */
 157
 158 /* The argument to IP6T_SO_GET_INFO */
 159 struct ip6t_getinfo
 160 {
 161         /* Which table: caller fills this in. */
 162         char name[IP6T_TABLE_MAXNAMELEN];
 163
 164         /* Kernel fills these in. */
 165         /* Which hook entry points are valid: bitmask */
 166         unsigned int valid_hooks;
 167
 168         /* Hook entry points: one per netfilter hook. */
 169         unsigned int hook_entry[NF_IP6_NUMHOOKS];
 170
 171         /* Underflow points. */
 172         unsigned int underflow[NF_IP6_NUMHOOKS];
 173
 174         /* Number of entries */
 175         unsigned int num_entries;
 176
 177         /* Size of entries. */
 178         unsigned int size;
 179 };
 180
 181 /* The argument to IP6T_SO_SET_REPLACE. */
 182 struct ip6t_replace
 183 {
 184         /* Which table. */
 185         char name[IP6T_TABLE_MAXNAMELEN];
 186
 187         /* Which hook entry points are valid: bitmask.  You can't
 188            change this. */
 189         unsigned int valid_hooks;
 190
 191         /* Number of entries */
 192         unsigned int num_entries;
 193
 194         /* Total size of new entries */
 195         unsigned int size;
 196
 197         /* Hook entry points. */
 198         unsigned int hook_entry[NF_IP6_NUMHOOKS];
 199
 200         /* Underflow points. */
 201         unsigned int underflow[NF_IP6_NUMHOOKS];
 202
 203         /* Information about old entries: */
 204         /* Number of counters (must be equal to current number of entries). */
 205         unsigned int num_counters;
 206         /* The old entries' counters. */
 207         struct xt_counters __user *counters;
 208
 209         /* The entries (hang off end: not really an array). */
 210         struct ip6t_entry entries[0];
 211 };
 212
 213 /* The argument to IP6T_SO_ADD_COUNTERS. */
 214 #define ip6t_counters_info xt_counters_info
 215
 216 /* The argument to IP6T_SO_GET_ENTRIES. */
 217 struct ip6t_get_entries
 218 {
 219         /* Which table: user fills this in. */
 220         char name[IP6T_TABLE_MAXNAMELEN];
 221
 222         /* User fills this in: total entry size. */
 223         unsigned int size;
 224
 225         /* The entries. */
 226         struct ip6t_entry entrytable[0];
 227 };
 228
 229 /* Standard return verdict, or do jump. */
 230 #define IP6T_STANDARD_TARGET XT_STANDARD_TARGET
 231 /* Error verdict. */
 232 #define IP6T_ERROR_TARGET XT_ERROR_TARGET
 233
 234 /* Helper functions */
 235 static __inline__ struct ip6t_entry_target *
 236 ip6t_get_target(struct ip6t_entry *e)
 237 {
 238         return (void *)e + e->target_offset;
 239 }
 240
 241 /* fn returns 0 to continue iteration */
 242 #define IP6T_MATCH_ITERATE(e, fn, args...)      \
 243 ({                                              \
 244         unsigned int __i;                       \
 245         int __ret = 0;                          \
 246         struct ip6t_entry_match *__m;           \
 247                                                 \
 248         for (__i = sizeof(struct ip6t_entry);   \
 249              __i < (e)->target_offset;          \
 250              __i += __m->u.match_size) {        \
 251                 __m = (void *)(e) + __i;        \
 252                                                 \
 253                 __ret = fn(__m , ## args);      \
 254                 if (__ret != 0)                 \
 255                         break;                  \
 256         }                                       \
 257         __ret;                                  \
 258 })
 259
 260 /* fn returns 0 to continue iteration */
 261 #define IP6T_ENTRY_ITERATE(entries, size, fn, args...)          \
 262 ({                                                              \
 263         unsigned int __i;                                       \
 264         int __ret = 0;                                          \
 265         struct ip6t_entry *__e;                                 \
 266                                                                 \
 267         for (__i = 0; __i < (size); __i += __e->next_offset) {  \
 268                 __e = (void *)(entries) + __i;                  \
 269                                                                 \
 270                 __ret = fn(__e , ## args);                      \
 271                 if (__ret != 0)                                 \
 272                         break;                                  \
 273         }                                                       \
 274         __ret;                                                  \
 275 })
 276
 277 /*
 278  *      Main firewall chains definitions and global var's definitions.
 279  */
 280
 281 #ifdef __KERNEL__
 282
 283 #include <linux/init.h>
 284 extern void ip6t_init(void) __init;
 285
 286 #define ip6t_register_target(tgt)               \
 287 ({      (tgt)->family = AF_INET6;               \
 288         xt_register_target(tgt); })
 289 #define ip6t_unregister_target(tgt) xt_unregister_target(tgt)
 290
 291 #define ip6t_register_match(match)              \
 292 ({      (match)->family = AF_INET6;             \
 293         xt_register_match(match); })
 294 #define ip6t_unregister_match(match) xt_unregister_match(match)
 295
 296 extern int ip6t_register_table(struct ip6t_table *table,
 297                                const struct ip6t_replace *repl);
 298 extern void ip6t_unregister_table(struct ip6t_table *table);
 299 extern unsigned int ip6t_do_table(struct sk_buff **pskb,
 300                                   unsigned int hook,
 301                                   const struct net_device *in,
 302                                   const struct net_device *out,
 303                                   struct ip6t_table *table);
 304
 305 /* Check for an extension */
 306 extern int ip6t_ext_hdr(u8 nexthdr);
 307 /* find specified header and get offset to it */
 308 extern int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset,
 309                          int target, unsigned short *fragoff);
 310
 311 extern int ip6_masked_addrcmp(const struct in6_addr *addr1,
 312                               const struct in6_addr *mask,
 313                               const struct in6_addr *addr2);
 314
 315 #define IP6T_ALIGN(s) (((s) + (__alignof__(struct ip6t_entry)-1)) & ~(__alignof__(struct ip6t_entry)-1))
 316
 317 #endif /*__KERNEL__*/
 318 #endif /* _IP6_TABLES_H */