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 #include <linux/types.h> 19 20 #include <linux/netfilter_ipv6.h> 21 22 #include <linux/netfilter/x_tables.h> 23 24 #define IP6T_FUNCTION_MAXNAMELEN XT_FUNCTION_MAXNAMELEN 25 #define IP6T_TABLE_MAXNAMELEN XT_TABLE_MAXNAMELEN 26 27 #define ip6t_match xt_match 28 #define ip6t_target xt_target 29 #define ip6t_table xt_table 30 #define ip6t_get_revision xt_get_revision 31 32 /* Yes, Virginia, you have to zero the padding. */ 33 struct ip6t_ip6 { 34 /* Source and destination IP6 addr */ 35 struct in6_addr src, dst; 36 /* Mask for src and dest IP6 addr */ 37 struct in6_addr smsk, dmsk; 38 char iniface[IFNAMSIZ], outiface[IFNAMSIZ]; 39 unsigned char iniface_mask[IFNAMSIZ], outiface_mask[IFNAMSIZ]; 40 41 /* Upper protocol number 42 * - The allowed value is 0 (any) or protocol number of last parsable 43 * header, which is 50 (ESP), 59 (No Next Header), 135 (MH), or 44 * the non IPv6 extension headers. 45 * - The protocol numbers of IPv6 extension headers except of ESP and 46 * MH do not match any packets. 47 * - You also need to set IP6T_FLAGS_PROTO to "flags" to check protocol. 48 */ 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 /* Standard entry */ 108 struct ip6t_standard 109 { 110 struct ip6t_entry entry; 111 struct ip6t_standard_target target; 112 }; 113 114 struct ip6t_error_target 115 { 116 struct ip6t_entry_target target; 117 char errorname[IP6T_FUNCTION_MAXNAMELEN]; 118 }; 119 120 struct ip6t_error 121 { 122 struct ip6t_entry entry; 123 struct ip6t_error_target target; 124 }; 125 126 #define IP6T_ENTRY_INIT(__size) \ 127 { \ 128 .target_offset = sizeof(struct ip6t_entry), \ 129 .next_offset = (__size), \ 130 } 131 132 #define IP6T_STANDARD_INIT(__verdict) \ 133 { \ 134 .entry = IP6T_ENTRY_INIT(sizeof(struct ip6t_standard)), \ 135 .target = XT_TARGET_INIT(IP6T_STANDARD_TARGET, \ 136 sizeof(struct ip6t_standard_target)), \ 137 .target.verdict = -(__verdict) - 1, \ 138 } 139 140 #define IP6T_ERROR_INIT \ 141 { \ 142 .entry = IP6T_ENTRY_INIT(sizeof(struct ip6t_error)), \ 143 .target = XT_TARGET_INIT(IP6T_ERROR_TARGET, \ 144 sizeof(struct ip6t_error_target)), \ 145 .target.errorname = "ERROR", \ 146 } 147 148 /* 149 * New IP firewall options for [gs]etsockopt at the RAW IP level. 150 * Unlike BSD Linux inherits IP options so you don't have to use 151 * a raw socket for this. Instead we check rights in the calls. 152 * 153 * ATTENTION: check linux/in6.h before adding new number here. 154 */ 155 #define IP6T_BASE_CTL 64 156 157 #define IP6T_SO_SET_REPLACE (IP6T_BASE_CTL) 158 #define IP6T_SO_SET_ADD_COUNTERS (IP6T_BASE_CTL + 1) 159 #define IP6T_SO_SET_MAX IP6T_SO_SET_ADD_COUNTERS 160 161 #define IP6T_SO_GET_INFO (IP6T_BASE_CTL) 162 #define IP6T_SO_GET_ENTRIES (IP6T_BASE_CTL + 1) 163 #define IP6T_SO_GET_REVISION_MATCH (IP6T_BASE_CTL + 4) 164 #define IP6T_SO_GET_REVISION_TARGET (IP6T_BASE_CTL + 5) 165 #define IP6T_SO_GET_MAX IP6T_SO_GET_REVISION_TARGET 166 167 /* CONTINUE verdict for targets */ 168 #define IP6T_CONTINUE XT_CONTINUE 169 170 /* For standard target */ 171 #define IP6T_RETURN XT_RETURN 172 173 /* TCP/UDP matching stuff */ 174 #include <linux/netfilter/xt_tcpudp.h> 175 176 #define ip6t_tcp xt_tcp 177 #define ip6t_udp xt_udp 178 179 /* Values for "inv" field in struct ipt_tcp. */ 180 #define IP6T_TCP_INV_SRCPT XT_TCP_INV_SRCPT 181 #define IP6T_TCP_INV_DSTPT XT_TCP_INV_DSTPT 182 #define IP6T_TCP_INV_FLAGS XT_TCP_INV_FLAGS 183 #define IP6T_TCP_INV_OPTION XT_TCP_INV_OPTION 184 #define IP6T_TCP_INV_MASK XT_TCP_INV_MASK 185 186 /* Values for "invflags" field in struct ipt_udp. */ 187 #define IP6T_UDP_INV_SRCPT XT_UDP_INV_SRCPT 188 #define IP6T_UDP_INV_DSTPT XT_UDP_INV_DSTPT 189 #define IP6T_UDP_INV_MASK XT_UDP_INV_MASK 190 191 /* ICMP matching stuff */ 192 struct ip6t_icmp 193 { 194 u_int8_t type; /* type to match */ 195 u_int8_t code[2]; /* range of code */ 196 u_int8_t invflags; /* Inverse flags */ 197 }; 198 199 /* Values for "inv" field for struct ipt_icmp. */ 200 #define IP6T_ICMP_INV 0x01 /* Invert the sense of type/code test */ 201 202 /* The argument to IP6T_SO_GET_INFO */ 203 struct ip6t_getinfo 204 { 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 { 228 /* Which table. */ 229 char name[IP6T_TABLE_MAXNAMELEN]; 230 231 /* Which hook entry points are valid: bitmask. You can't 232 change this. */ 233 unsigned int valid_hooks; 234 235 /* Number of entries */ 236 unsigned int num_entries; 237 238 /* Total size of new entries */ 239 unsigned int size; 240 241 /* Hook entry points. */ 242 unsigned int hook_entry[NF_INET_NUMHOOKS]; 243 244 /* Underflow points. */ 245 unsigned int underflow[NF_INET_NUMHOOKS]; 246 247 /* Information about old entries: */ 248 /* Number of counters (must be equal to current number of entries). */ 249 unsigned int num_counters; 250 /* The old entries' counters. */ 251 struct xt_counters *counters; 252 253 /* The entries (hang off end: not really an array). */ 254 struct ip6t_entry entries[0]; 255 }; 256 257 /* The argument to IP6T_SO_ADD_COUNTERS. */ 258 #define ip6t_counters_info xt_counters_info 259 260 /* The argument to IP6T_SO_GET_ENTRIES. */ 261 struct ip6t_get_entries 262 { 263 /* Which table: user fills this in. */ 264 char name[IP6T_TABLE_MAXNAMELEN]; 265 266 /* User fills this in: total entry size. */ 267 unsigned int size; 268 269 /* The entries. */ 270 struct ip6t_entry entrytable[0]; 271 }; 272 273 /* Standard return verdict, or do jump. */ 274 #define IP6T_STANDARD_TARGET XT_STANDARD_TARGET 275 /* Error verdict. */ 276 #define IP6T_ERROR_TARGET XT_ERROR_TARGET 277 278 /* Helper functions */ 279 static __inline__ struct ip6t_entry_target * 280 ip6t_get_target(struct ip6t_entry *e) 281 { 282 return (void *)e + e->target_offset; 283 } 284 285 /* fn returns 0 to continue iteration */ 286 #define IP6T_MATCH_ITERATE(e, fn, args...) \ 287 XT_MATCH_ITERATE(struct ip6t_entry, e, fn, ## args) 288 289 /* fn returns 0 to continue iteration */ 290 #define IP6T_ENTRY_ITERATE(entries, size, fn, args...) \ 291 XT_ENTRY_ITERATE(struct ip6t_entry, entries, size, fn, ## args) 292 293 /* 294 * Main firewall chains definitions and global var's definitions. 295 */ 296 297 #endif /* _IP6_TABLES_H */ 298
