1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2 /* 3 * 25-Jul-1998 Major changes to allow for ip chain table 4 * 5 * 3-Jan-2000 Named tables to allow packet selection for different uses. 6 */ 7 8 /* 9 * Format of an IP6 firewall descriptor 10 * 11 * src, dst, src_mask, dst_mask are always stored in network byte order. 12 * flags are stored in host byte order (of course). 13 * Port numbers are stored in HOST byte order. 14 */ 15 16 #ifndef _IP6_TABLES_H 17 #define _IP6_TABLES_H 18 19 #include <linux/types.h> 20 21 #include <linux/if.h> 22 #include <linux/netfilter_ipv6.h> 23 24 #include <linux/netfilter/x_tables.h> 25 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 61 /* Yes, Virginia, you have to zero the padding. */ 62 struct ip6t_ip6 { 63 /* Source and destination IP6 addr */ 64 struct in6_addr src, dst; 65 /* Mask for src and dest IP6 addr */ 66 struct in6_addr smsk, dmsk; 67 char iniface[IFNAMSIZ], outiface[IFNAMSIZ]; 68 unsigned char iniface_mask[IFNAMSIZ], outiface_mask[IFNAMSIZ]; 69 70 /* Upper protocol number 71 * - The allowed value is 0 (any) or protocol number of last parsable 72 * header, which is 50 (ESP), 59 (No Next Header), 135 (MH), or 73 * the non IPv6 extension headers. 74 * - The protocol numbers of IPv6 extension headers except of ESP and 75 * MH do not match any packets. 76 * - You also need to set IP6T_FLAGS_PROTO to "flags" to check protocol. 77 */ 78 __u16 proto; 79 /* TOS to match iff flags & IP6T_F_TOS */ 80 __u8 tos; 81 82 /* Flags word */ 83 __u8 flags; 84 /* Inverse flags */ 85 __u8 invflags; 86 }; 87 88 /* Values for "flag" field in struct ip6t_ip6 (general ip6 structure). */ 89 #define IP6T_F_PROTO 0x01 /* Set if rule cares about upper 90 protocols */ 91 #define IP6T_F_TOS 0x02 /* Match the TOS. */ 92 #define IP6T_F_GOTO 0x04 /* Set if jump is a goto */ 93 #define IP6T_F_MASK 0x07 /* All possible flag bits mask. */ 94 95 /* Values for "inv" field in struct ip6t_ip6. */ 96 #define IP6T_INV_VIA_IN 0x01 /* Invert the sense of IN IFACE. */ 97 #define IP6T_INV_VIA_OUT 0x02 /* Invert the sense of OUT IFACE */ 98 #define IP6T_INV_TOS 0x04 /* Invert the sense of TOS. */ 99 #define IP6T_INV_SRCIP 0x08 /* Invert the sense of SRC IP. */ 100 #define IP6T_INV_DSTIP 0x10 /* Invert the sense of DST OP. */ 101 #define IP6T_INV_FRAG 0x20 /* Invert the sense of FRAG. */ 102 #define IP6T_INV_PROTO XT_INV_PROTO 103 #define IP6T_INV_MASK 0x7F /* All possible flag bits mask. */ 104 105 /* This structure defines each of the firewall rules. Consists of 3 106 parts which are 1) general IP header stuff 2) match specific 107 stuff 3) the target to perform if the rule matches */ 108 struct ip6t_entry { 109 struct ip6t_ip6 ipv6; 110 111 /* Mark with fields that we care about. */ 112 unsigned int nfcache; 113 114 /* Size of ipt_entry + matches */ 115 __u16 target_offset; 116 /* Size of ipt_entry + matches + target */ 117 __u16 next_offset; 118 119 /* Back pointer */ 120 unsigned int comefrom; 121 122 /* Packet and byte counters. */ 123 struct xt_counters counters; 124 125 /* The matches (if any), then the target. */ 126 unsigned char elems[0]; 127 }; 128 129 /* Standard entry */ 130 struct ip6t_standard { 131 struct ip6t_entry entry; 132 struct xt_standard_target target; 133 }; 134 135 struct ip6t_error { 136 struct ip6t_entry entry; 137 struct xt_error_target target; 138 }; 139 140 #define IP6T_ENTRY_INIT(__size) \ 141 { \ 142 .target_offset = sizeof(struct ip6t_entry), \ 143 .next_offset = (__size), \ 144 } 145 146 #define IP6T_STANDARD_INIT(__verdict) \ 147 { \ 148 .entry = IP6T_ENTRY_INIT(sizeof(struct ip6t_standard)), \ 149 .target = XT_TARGET_INIT(XT_STANDARD_TARGET, \ 150 sizeof(struct xt_standard_target)), \ 151 .target.verdict = -(__verdict) - 1, \ 152 } 153 154 #define IP6T_ERROR_INIT \ 155 { \ 156 .entry = IP6T_ENTRY_INIT(sizeof(struct ip6t_error)), \ 157 .target = XT_TARGET_INIT(XT_ERROR_TARGET, \ 158 sizeof(struct xt_error_target)), \ 159 .target.errorname = "ERROR", \ 160 } 161 162 /* 163 * New IP firewall options for [gs]etsockopt at the RAW IP level. 164 * Unlike BSD Linux inherits IP options so you don't have to use 165 * a raw socket for this. Instead we check rights in the calls. 166 * 167 * ATTENTION: check linux/in6.h before adding new number here. 168 */ 169 #define IP6T_BASE_CTL 64 170 171 #define IP6T_SO_SET_REPLACE (IP6T_BASE_CTL) 172 #define IP6T_SO_SET_ADD_COUNTERS (IP6T_BASE_CTL + 1) 173 #define IP6T_SO_SET_MAX IP6T_SO_SET_ADD_COUNTERS 174 175 #define IP6T_SO_GET_INFO (IP6T_BASE_CTL) 176 #define IP6T_SO_GET_ENTRIES (IP6T_BASE_CTL + 1) 177 #define IP6T_SO_GET_REVISION_MATCH (IP6T_BASE_CTL + 4) 178 #define IP6T_SO_GET_REVISION_TARGET (IP6T_BASE_CTL + 5) 179 #define IP6T_SO_GET_MAX IP6T_SO_GET_REVISION_TARGET 180 181 /* obtain original address if REDIRECT'd connection */ 182 #define IP6T_SO_ORIGINAL_DST 80 183 184 /* ICMP matching stuff */ 185 struct ip6t_icmp { 186 __u8 type; /* type to match */ 187 __u8 code[2]; /* range of code */ 188 __u8 invflags; /* Inverse flags */ 189 }; 190 191 /* Values for "inv" field for struct ipt_icmp. */ 192 #define IP6T_ICMP_INV 0x01 /* Invert the sense of type/code test */ 193 194 /* The argument to IP6T_SO_GET_INFO */ 195 struct ip6t_getinfo { 196 /* Which table: caller fills this in. */ 197 char name[XT_TABLE_MAXNAMELEN]; 198 199 /* Kernel fills these in. */ 200 /* Which hook entry points are valid: bitmask */ 201 unsigned int valid_hooks; 202 203 /* Hook entry points: one per netfilter hook. */ 204 unsigned int hook_entry[NF_INET_NUMHOOKS]; 205 206 /* Underflow points. */ 207 unsigned int underflow[NF_INET_NUMHOOKS]; 208 209 /* Number of entries */ 210 unsigned int num_entries; 211 212 /* Size of entries. */ 213 unsigned int size; 214 }; 215 216 /* The argument to IP6T_SO_SET_REPLACE. */ 217 struct ip6t_replace { 218 /* Which table. */ 219 char name[XT_TABLE_MAXNAMELEN]; 220 221 /* Which hook entry points are valid: bitmask. You can't 222 change this. */ 223 unsigned int valid_hooks; 224 225 /* Number of entries */ 226 unsigned int num_entries; 227 228 /* Total size of new entries */ 229 unsigned int size; 230 231 /* Hook entry points. */ 232 unsigned int hook_entry[NF_INET_NUMHOOKS]; 233 234 /* Underflow points. */ 235 unsigned int underflow[NF_INET_NUMHOOKS]; 236 237 /* Information about old entries: */ 238 /* Number of counters (must be equal to current number of entries). */ 239 unsigned int num_counters; 240 /* The old entries' counters. */ 241 struct xt_counters *counters; 242 243 /* The entries (hang off end: not really an array). */ 244 struct ip6t_entry entries[0]; 245 }; 246 247 /* The argument to IP6T_SO_GET_ENTRIES. */ 248 struct ip6t_get_entries { 249 /* Which table: user fills this in. */ 250 char name[XT_TABLE_MAXNAMELEN]; 251 252 /* User fills this in: total entry size. */ 253 unsigned int size; 254 255 /* The entries. */ 256 struct ip6t_entry entrytable[0]; 257 }; 258 259 /* Helper functions */ 260 static __inline__ struct xt_entry_target * 261 ip6t_get_target(struct ip6t_entry *e) 262 { 263 return (void *)e + e->target_offset; 264 } 265 266 /* 267 * Main firewall chains definitions and global var's definitions. 268 */ 269 270 #endif /* _IP6_TABLES_H */ 271
