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 #define ip6t_match xt_match 27 #define ip6t_target xt_target 28 #define ip6t_table xt_table 29 #define ip6t_get_revision xt_get_revision 30 #define ip6t_entry_match xt_entry_match 31 #define ip6t_entry_target xt_entry_target 32 #define ip6t_standard_target xt_standard_target 33 #define ip6t_error_target xt_error_target 34 #define ip6t_counters xt_counters 35 #define IP6T_CONTINUE XT_CONTINUE 36 #define IP6T_RETURN XT_RETURN 37 38 /* Pre-iptables-1.4.0 */ 39 #include <linux/netfilter/xt_tcpudp.h> 40 #define ip6t_tcp xt_tcp 41 #define ip6t_udp xt_udp 42 #define IP6T_TCP_INV_SRCPT XT_TCP_INV_SRCPT 43 #define IP6T_TCP_INV_DSTPT XT_TCP_INV_DSTPT 44 #define IP6T_TCP_INV_FLAGS XT_TCP_INV_FLAGS 45 #define IP6T_TCP_INV_OPTION XT_TCP_INV_OPTION 46 #define IP6T_TCP_INV_MASK XT_TCP_INV_MASK 47 #define IP6T_UDP_INV_SRCPT XT_UDP_INV_SRCPT 48 #define IP6T_UDP_INV_DSTPT XT_UDP_INV_DSTPT 49 #define IP6T_UDP_INV_MASK XT_UDP_INV_MASK 50 51 #define ip6t_counters_info xt_counters_info 52 #define IP6T_STANDARD_TARGET XT_STANDARD_TARGET 53 #define IP6T_ERROR_TARGET XT_ERROR_TARGET 54 #define IP6T_MATCH_ITERATE(e, fn, args...) \ 55 XT_MATCH_ITERATE(struct ip6t_entry, e, fn, ## args) 56 #define IP6T_ENTRY_ITERATE(entries, size, fn, args...) \ 57 XT_ENTRY_ITERATE(struct ip6t_entry, entries, size, fn, ## args) 58 59 /* Yes, Virginia, you have to zero the padding. */ 60 struct ip6t_ip6 { 61 /* Source and destination IP6 addr */ 62 struct in6_addr src, dst; 63 /* Mask for src and dest IP6 addr */ 64 struct in6_addr smsk, dmsk; 65 char iniface[IFNAMSIZ], outiface[IFNAMSIZ]; 66 unsigned char iniface_mask[IFNAMSIZ], outiface_mask[IFNAMSIZ]; 67 68 /* Upper protocol number 69 * - The allowed value is 0 (any) or protocol number of last parsable 70 * header, which is 50 (ESP), 59 (No Next Header), 135 (MH), or 71 * the non IPv6 extension headers. 72 * - The protocol numbers of IPv6 extension headers except of ESP and 73 * MH do not match any packets. 74 * - You also need to set IP6T_FLAGS_PROTO to "flags" to check protocol. 75 */ 76 __u16 proto; 77 /* TOS to match iff flags & IP6T_F_TOS */ 78 __u8 tos; 79 80 /* Flags word */ 81 __u8 flags; 82 /* Inverse flags */ 83 __u8 invflags; 84 }; 85 86 /* Values for "flag" field in struct ip6t_ip6 (general ip6 structure). */ 87 #define IP6T_F_PROTO 0x01 /* Set if rule cares about upper 88 protocols */ 89 #define IP6T_F_TOS 0x02 /* Match the TOS. */ 90 #define IP6T_F_GOTO 0x04 /* Set if jump is a goto */ 91 #define IP6T_F_MASK 0x07 /* All possible flag bits mask. */ 92 93 /* Values for "inv" field in struct ip6t_ip6. */ 94 #define IP6T_INV_VIA_IN 0x01 /* Invert the sense of IN IFACE. */ 95 #define IP6T_INV_VIA_OUT 0x02 /* Invert the sense of OUT IFACE */ 96 #define IP6T_INV_TOS 0x04 /* Invert the sense of TOS. */ 97 #define IP6T_INV_SRCIP 0x08 /* Invert the sense of SRC IP. */ 98 #define IP6T_INV_DSTIP 0x10 /* Invert the sense of DST OP. */ 99 #define IP6T_INV_FRAG 0x20 /* Invert the sense of FRAG. */ 100 #define IP6T_INV_PROTO XT_INV_PROTO 101 #define IP6T_INV_MASK 0x7F /* All possible flag bits mask. */ 102 103 /* This structure defines each of the firewall rules. Consists of 3 104 parts which are 1) general IP header stuff 2) match specific 105 stuff 3) the target to perform if the rule matches */ 106 struct ip6t_entry { 107 struct ip6t_ip6 ipv6; 108 109 /* Mark with fields that we care about. */ 110 unsigned int nfcache; 111 112 /* Size of ipt_entry + matches */ 113 __u16 target_offset; 114 /* Size of ipt_entry + matches + target */ 115 __u16 next_offset; 116 117 /* Back pointer */ 118 unsigned int comefrom; 119 120 /* Packet and byte counters. */ 121 struct xt_counters counters; 122 123 /* The matches (if any), then the target. */ 124 unsigned char elems[0]; 125 }; 126 127 /* Standard entry */ 128 struct ip6t_standard { 129 struct ip6t_entry entry; 130 struct xt_standard_target target; 131 }; 132 133 struct ip6t_error { 134 struct ip6t_entry entry; 135 struct xt_error_target target; 136 }; 137 138 #define IP6T_ENTRY_INIT(__size) \ 139 { \ 140 .target_offset = sizeof(struct ip6t_entry), \ 141 .next_offset = (__size), \ 142 } 143 144 #define IP6T_STANDARD_INIT(__verdict) \ 145 { \ 146 .entry = IP6T_ENTRY_INIT(sizeof(struct ip6t_standard)), \ 147 .target = XT_TARGET_INIT(XT_STANDARD_TARGET, \ 148 sizeof(struct xt_standard_target)), \ 149 .target.verdict = -(__verdict) - 1, \ 150 } 151 152 #define IP6T_ERROR_INIT \ 153 { \ 154 .entry = IP6T_ENTRY_INIT(sizeof(struct ip6t_error)), \ 155 .target = XT_TARGET_INIT(XT_ERROR_TARGET, \ 156 sizeof(struct xt_error_target)), \ 157 .target.errorname = "ERROR", \ 158 } 159 160 /* 161 * New IP firewall options for [gs]etsockopt at the RAW IP level. 162 * Unlike BSD Linux inherits IP options so you don't have to use 163 * a raw socket for this. Instead we check rights in the calls. 164 * 165 * ATTENTION: check linux/in6.h before adding new number here. 166 */ 167 #define IP6T_BASE_CTL 64 168 169 #define IP6T_SO_SET_REPLACE (IP6T_BASE_CTL) 170 #define IP6T_SO_SET_ADD_COUNTERS (IP6T_BASE_CTL + 1) 171 #define IP6T_SO_SET_MAX IP6T_SO_SET_ADD_COUNTERS 172 173 #define IP6T_SO_GET_INFO (IP6T_BASE_CTL) 174 #define IP6T_SO_GET_ENTRIES (IP6T_BASE_CTL + 1) 175 #define IP6T_SO_GET_REVISION_MATCH (IP6T_BASE_CTL + 4) 176 #define IP6T_SO_GET_REVISION_TARGET (IP6T_BASE_CTL + 5) 177 #define IP6T_SO_GET_MAX IP6T_SO_GET_REVISION_TARGET 178 179 /* obtain original address if REDIRECT'd connection */ 180 #define IP6T_SO_ORIGINAL_DST 80 181 182 /* ICMP matching stuff */ 183 struct ip6t_icmp { 184 __u8 type; /* type to match */ 185 __u8 code[2]; /* range of code */ 186 __u8 invflags; /* Inverse flags */ 187 }; 188 189 /* Values for "inv" field for struct ipt_icmp. */ 190 #define IP6T_ICMP_INV 0x01 /* Invert the sense of type/code test */ 191 192 /* The argument to IP6T_SO_GET_INFO */ 193 struct ip6t_getinfo { 194 /* Which table: caller fills this in. */ 195 char name[XT_TABLE_MAXNAMELEN]; 196 197 /* Kernel fills these in. */ 198 /* Which hook entry points are valid: bitmask */ 199 unsigned int valid_hooks; 200 201 /* Hook entry points: one per netfilter hook. */ 202 unsigned int hook_entry[NF_INET_NUMHOOKS]; 203 204 /* Underflow points. */ 205 unsigned int underflow[NF_INET_NUMHOOKS]; 206 207 /* Number of entries */ 208 unsigned int num_entries; 209 210 /* Size of entries. */ 211 unsigned int size; 212 }; 213 214 /* The argument to IP6T_SO_SET_REPLACE. */ 215 struct ip6t_replace { 216 /* Which table. */ 217 char name[XT_TABLE_MAXNAMELEN]; 218 219 /* Which hook entry points are valid: bitmask. You can't 220 change this. */ 221 unsigned int valid_hooks; 222 223 /* Number of entries */ 224 unsigned int num_entries; 225 226 /* Total size of new entries */ 227 unsigned int size; 228 229 /* Hook entry points. */ 230 unsigned int hook_entry[NF_INET_NUMHOOKS]; 231 232 /* Underflow points. */ 233 unsigned int underflow[NF_INET_NUMHOOKS]; 234 235 /* Information about old entries: */ 236 /* Number of counters (must be equal to current number of entries). */ 237 unsigned int num_counters; 238 /* The old entries' counters. */ 239 struct xt_counters *counters; 240 241 /* The entries (hang off end: not really an array). */ 242 struct ip6t_entry entries[0]; 243 }; 244 245 /* The argument to IP6T_SO_GET_ENTRIES. */ 246 struct ip6t_get_entries { 247 /* Which table: user fills this in. */ 248 char name[XT_TABLE_MAXNAMELEN]; 249 250 /* User fills this in: total entry size. */ 251 unsigned int size; 252 253 /* The entries. */ 254 struct ip6t_entry entrytable[0]; 255 }; 256 257 /* Helper functions */ 258 static __inline__ struct xt_entry_target * 259 ip6t_get_target(struct ip6t_entry *e) 260 { 261 return (void *)e + e->target_offset; 262 } 263 264 /* 265 * Main firewall chains definitions and global var's definitions. 266 */ 267 268 #endif /* _IP6_TABLES_H */ 269
