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 _UAPI_IP6_TABLES_H 16 #define _UAPI_IP6_TABLES_H 17 18 #include <linux/types.h> 19 #include <linux/compiler.h> 20 #include <linux/if.h> 21 #include <linux/netfilter_ipv6.h> 22 23 #include <linux/netfilter/x_tables.h> 24 25 #ifndef __KERNEL__ 26 #define IP6T_FUNCTION_MAXNAMELEN XT_FUNCTION_MAXNAMELEN 27 #define IP6T_TABLE_MAXNAMELEN XT_TABLE_MAXNAMELEN 28 #define ip6t_match xt_match 29 #define ip6t_target xt_target 30 #define ip6t_table xt_table 31 #define ip6t_get_revision xt_get_revision 32 #define ip6t_entry_match xt_entry_match 33 #define ip6t_entry_target xt_entry_target 34 #define ip6t_standard_target xt_standard_target 35 #define ip6t_error_target xt_error_target 36 #define ip6t_counters xt_counters 37 #define IP6T_CONTINUE XT_CONTINUE 38 #define IP6T_RETURN XT_RETURN 39 40 /* Pre-iptables-1.4.0 */ 41 #include <linux/netfilter/xt_tcpudp.h> 42 #define ip6t_tcp xt_tcp 43 #define ip6t_udp xt_udp 44 #define IP6T_TCP_INV_SRCPT XT_TCP_INV_SRCPT 45 #define IP6T_TCP_INV_DSTPT XT_TCP_INV_DSTPT 46 #define IP6T_TCP_INV_FLAGS XT_TCP_INV_FLAGS 47 #define IP6T_TCP_INV_OPTION XT_TCP_INV_OPTION 48 #define IP6T_TCP_INV_MASK XT_TCP_INV_MASK 49 #define IP6T_UDP_INV_SRCPT XT_UDP_INV_SRCPT 50 #define IP6T_UDP_INV_DSTPT XT_UDP_INV_DSTPT 51 #define IP6T_UDP_INV_MASK XT_UDP_INV_MASK 52 53 #define ip6t_counters_info xt_counters_info 54 #define IP6T_STANDARD_TARGET XT_STANDARD_TARGET 55 #define IP6T_ERROR_TARGET XT_ERROR_TARGET 56 #define IP6T_MATCH_ITERATE(e, fn, args...) \ 57 XT_MATCH_ITERATE(struct ip6t_entry, e, fn, ## args) 58 #define IP6T_ENTRY_ITERATE(entries, size, fn, args...) \ 59 XT_ENTRY_ITERATE(struct ip6t_entry, entries, size, fn, ## args) 60 #endif 61 62 /* Yes, Virginia, you have to zero the padding. */ 63 struct ip6t_ip6 { 64 /* Source and destination IP6 addr */ 65 struct in6_addr src, dst; 66 /* Mask for src and dest IP6 addr */ 67 struct in6_addr smsk, dmsk; 68 char iniface[IFNAMSIZ], outiface[IFNAMSIZ]; 69 unsigned char iniface_mask[IFNAMSIZ], outiface_mask[IFNAMSIZ]; 70 71 /* Upper protocol number 72 * - The allowed value is 0 (any) or protocol number of last parsable 73 * header, which is 50 (ESP), 59 (No Next Header), 135 (MH), or 74 * the non IPv6 extension headers. 75 * - The protocol numbers of IPv6 extension headers except of ESP and 76 * MH do not match any packets. 77 * - You also need to set IP6T_FLAGS_PROTO to "flags" to check protocol. 78 */ 79 __u16 proto; 80 /* TOS to match iff flags & IP6T_F_TOS */ 81 __u8 tos; 82 83 /* Flags word */ 84 __u8 flags; 85 /* Inverse flags */ 86 __u8 invflags; 87 }; 88 89 /* Values for "flag" field in struct ip6t_ip6 (general ip6 structure). */ 90 #define IP6T_F_PROTO 0x01 /* Set if rule cares about upper 91 protocols */ 92 #define IP6T_F_TOS 0x02 /* Match the TOS. */ 93 #define IP6T_F_GOTO 0x04 /* Set if jump is a goto */ 94 #define IP6T_F_MASK 0x07 /* All possible flag bits mask. */ 95 96 /* Values for "inv" field in struct ip6t_ip6. */ 97 #define IP6T_INV_VIA_IN 0x01 /* Invert the sense of IN IFACE. */ 98 #define IP6T_INV_VIA_OUT 0x02 /* Invert the sense of OUT IFACE */ 99 #define IP6T_INV_TOS 0x04 /* Invert the sense of TOS. */ 100 #define IP6T_INV_SRCIP 0x08 /* Invert the sense of SRC IP. */ 101 #define IP6T_INV_DSTIP 0x10 /* Invert the sense of DST OP. */ 102 #define IP6T_INV_FRAG 0x20 /* Invert the sense of FRAG. */ 103 #define IP6T_INV_PROTO XT_INV_PROTO 104 #define IP6T_INV_MASK 0x7F /* All possible flag bits mask. */ 105 106 /* This structure defines each of the firewall rules. Consists of 3 107 parts which are 1) general IP header stuff 2) match specific 108 stuff 3) the target to perform if the rule matches */ 109 struct ip6t_entry { 110 struct ip6t_ip6 ipv6; 111 112 /* Mark with fields that we care about. */ 113 unsigned int nfcache; 114 115 /* Size of ipt_entry + matches */ 116 __u16 target_offset; 117 /* Size of ipt_entry + matches + target */ 118 __u16 next_offset; 119 120 /* Back pointer */ 121 unsigned int comefrom; 122 123 /* Packet and byte counters. */ 124 struct xt_counters counters; 125 126 /* The matches (if any), then the target. */ 127 unsigned char elems[0]; 128 }; 129 130 /* Standard entry */ 131 struct ip6t_standard { 132 struct ip6t_entry entry; 133 struct xt_standard_target target; 134 }; 135 136 struct ip6t_error { 137 struct ip6t_entry entry; 138 struct xt_error_target target; 139 }; 140 141 #define IP6T_ENTRY_INIT(__size) \ 142 { \ 143 .target_offset = sizeof(struct ip6t_entry), \ 144 .next_offset = (__size), \ 145 } 146 147 #define IP6T_STANDARD_INIT(__verdict) \ 148 { \ 149 .entry = IP6T_ENTRY_INIT(sizeof(struct ip6t_standard)), \ 150 .target = XT_TARGET_INIT(XT_STANDARD_TARGET, \ 151 sizeof(struct xt_standard_target)), \ 152 .target.verdict = -(__verdict) - 1, \ 153 } 154 155 #define IP6T_ERROR_INIT \ 156 { \ 157 .entry = IP6T_ENTRY_INIT(sizeof(struct ip6t_error)), \ 158 .target = XT_TARGET_INIT(XT_ERROR_TARGET, \ 159 sizeof(struct xt_error_target)), \ 160 .target.errorname = "ERROR", \ 161 } 162 163 /* 164 * New IP firewall options for [gs]etsockopt at the RAW IP level. 165 * Unlike BSD Linux inherits IP options so you don't have to use 166 * a raw socket for this. Instead we check rights in the calls. 167 * 168 * ATTENTION: check linux/in6.h before adding new number here. 169 */ 170 #define IP6T_BASE_CTL 64 171 172 #define IP6T_SO_SET_REPLACE (IP6T_BASE_CTL) 173 #define IP6T_SO_SET_ADD_COUNTERS (IP6T_BASE_CTL + 1) 174 #define IP6T_SO_SET_MAX IP6T_SO_SET_ADD_COUNTERS 175 176 #define IP6T_SO_GET_INFO (IP6T_BASE_CTL) 177 #define IP6T_SO_GET_ENTRIES (IP6T_BASE_CTL + 1) 178 #define IP6T_SO_GET_REVISION_MATCH (IP6T_BASE_CTL + 4) 179 #define IP6T_SO_GET_REVISION_TARGET (IP6T_BASE_CTL + 5) 180 #define IP6T_SO_GET_MAX IP6T_SO_GET_REVISION_TARGET 181 182 /* obtain original address if REDIRECT'd connection */ 183 #define IP6T_SO_ORIGINAL_DST 80 184 185 /* ICMP matching stuff */ 186 struct ip6t_icmp { 187 __u8 type; /* type to match */ 188 __u8 code[2]; /* range of code */ 189 __u8 invflags; /* Inverse flags */ 190 }; 191 192 /* Values for "inv" field for struct ipt_icmp. */ 193 #define IP6T_ICMP_INV 0x01 /* Invert the sense of type/code test */ 194 195 /* The argument to IP6T_SO_GET_INFO */ 196 struct ip6t_getinfo { 197 /* Which table: caller fills this in. */ 198 char name[XT_TABLE_MAXNAMELEN]; 199 200 /* Kernel fills these in. */ 201 /* Which hook entry points are valid: bitmask */ 202 unsigned int valid_hooks; 203 204 /* Hook entry points: one per netfilter hook. */ 205 unsigned int hook_entry[NF_INET_NUMHOOKS]; 206 207 /* Underflow points. */ 208 unsigned int underflow[NF_INET_NUMHOOKS]; 209 210 /* Number of entries */ 211 unsigned int num_entries; 212 213 /* Size of entries. */ 214 unsigned int size; 215 }; 216 217 /* The argument to IP6T_SO_SET_REPLACE. */ 218 struct ip6t_replace { 219 /* Which table. */ 220 char name[XT_TABLE_MAXNAMELEN]; 221 222 /* Which hook entry points are valid: bitmask. You can't 223 change this. */ 224 unsigned int valid_hooks; 225 226 /* Number of entries */ 227 unsigned int num_entries; 228 229 /* Total size of new entries */ 230 unsigned int size; 231 232 /* Hook entry points. */ 233 unsigned int hook_entry[NF_INET_NUMHOOKS]; 234 235 /* Underflow points. */ 236 unsigned int underflow[NF_INET_NUMHOOKS]; 237 238 /* Information about old entries: */ 239 /* Number of counters (must be equal to current number of entries). */ 240 unsigned int num_counters; 241 /* The old entries' counters. */ 242 struct xt_counters __user *counters; 243 244 /* The entries (hang off end: not really an array). */ 245 struct ip6t_entry entries[0]; 246 }; 247 248 /* The argument to IP6T_SO_GET_ENTRIES. */ 249 struct ip6t_get_entries { 250 /* Which table: user fills this in. */ 251 char name[XT_TABLE_MAXNAMELEN]; 252 253 /* User fills this in: total entry size. */ 254 unsigned int size; 255 256 /* The entries. */ 257 struct ip6t_entry entrytable[0]; 258 }; 259 260 /* Helper functions */ 261 static __inline__ struct xt_entry_target * 262 ip6t_get_target(struct ip6t_entry *e) 263 { 264 return (void *)e + e->target_offset; 265 } 266 267 /* 268 * Main firewall chains definitions and global var's definitions. 269 */ 270 271 #endif /* _UAPI_IP6_TABLES_H */ 272
