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 _UAPI_IP6_TABLES_H 17 #define _UAPI_IP6_TABLES_H 18 19 #include <linux/types.h> 20 #include <linux/compiler.h> 21 #include <linux/if.h> 22 #include <linux/netfilter_ipv6.h> 23 24 #include <linux/netfilter/x_tables.h> 25 26 #ifndef __KERNEL__ 27 #define IP6T_FUNCTION_MAXNAMELEN XT_FUNCTION_MAXNAMELEN 28 #define IP6T_TABLE_MAXNAMELEN XT_TABLE_MAXNAMELEN 29 #define ip6t_match xt_match 30 #define ip6t_target xt_target 31 #define ip6t_table xt_table 32 #define ip6t_get_revision xt_get_revision 33 #define ip6t_entry_match xt_entry_match 34 #define ip6t_entry_target xt_entry_target 35 #define ip6t_standard_target xt_standard_target 36 #define ip6t_error_target xt_error_target 37 #define ip6t_counters xt_counters 38 #define IP6T_CONTINUE XT_CONTINUE 39 #define IP6T_RETURN XT_RETURN 40 41 /* Pre-iptables-1.4.0 */ 42 #include <linux/netfilter/xt_tcpudp.h> 43 #define ip6t_tcp xt_tcp 44 #define ip6t_udp xt_udp 45 #define IP6T_TCP_INV_SRCPT XT_TCP_INV_SRCPT 46 #define IP6T_TCP_INV_DSTPT XT_TCP_INV_DSTPT 47 #define IP6T_TCP_INV_FLAGS XT_TCP_INV_FLAGS 48 #define IP6T_TCP_INV_OPTION XT_TCP_INV_OPTION 49 #define IP6T_TCP_INV_MASK XT_TCP_INV_MASK 50 #define IP6T_UDP_INV_SRCPT XT_UDP_INV_SRCPT 51 #define IP6T_UDP_INV_DSTPT XT_UDP_INV_DSTPT 52 #define IP6T_UDP_INV_MASK XT_UDP_INV_MASK 53 54 #define ip6t_counters_info xt_counters_info 55 #define IP6T_STANDARD_TARGET XT_STANDARD_TARGET 56 #define IP6T_ERROR_TARGET XT_ERROR_TARGET 57 #define IP6T_MATCH_ITERATE(e, fn, args...) \ 58 XT_MATCH_ITERATE(struct ip6t_entry, e, fn, ## args) 59 #define IP6T_ENTRY_ITERATE(entries, size, fn, args...) \ 60 XT_ENTRY_ITERATE(struct ip6t_entry, entries, size, fn, ## args) 61 #endif 62 63 /* Yes, Virginia, you have to zero the padding. */ 64 struct ip6t_ip6 { 65 /* Source and destination IP6 addr */ 66 struct in6_addr src, dst; 67 /* Mask for src and dest IP6 addr */ 68 struct in6_addr smsk, dmsk; 69 char iniface[IFNAMSIZ], outiface[IFNAMSIZ]; 70 unsigned char iniface_mask[IFNAMSIZ], outiface_mask[IFNAMSIZ]; 71 72 /* Upper protocol number 73 * - The allowed value is 0 (any) or protocol number of last parsable 74 * header, which is 50 (ESP), 59 (No Next Header), 135 (MH), or 75 * the non IPv6 extension headers. 76 * - The protocol numbers of IPv6 extension headers except of ESP and 77 * MH do not match any packets. 78 * - You also need to set IP6T_FLAGS_PROTO to "flags" to check protocol. 79 */ 80 __u16 proto; 81 /* TOS to match iff flags & IP6T_F_TOS */ 82 __u8 tos; 83 84 /* Flags word */ 85 __u8 flags; 86 /* Inverse flags */ 87 __u8 invflags; 88 }; 89 90 /* Values for "flag" field in struct ip6t_ip6 (general ip6 structure). */ 91 #define IP6T_F_PROTO 0x01 /* Set if rule cares about upper 92 protocols */ 93 #define IP6T_F_TOS 0x02 /* Match the TOS. */ 94 #define IP6T_F_GOTO 0x04 /* Set if jump is a goto */ 95 #define IP6T_F_MASK 0x07 /* All possible flag bits mask. */ 96 97 /* Values for "inv" field in struct ip6t_ip6. */ 98 #define IP6T_INV_VIA_IN 0x01 /* Invert the sense of IN IFACE. */ 99 #define IP6T_INV_VIA_OUT 0x02 /* Invert the sense of OUT IFACE */ 100 #define IP6T_INV_TOS 0x04 /* Invert the sense of TOS. */ 101 #define IP6T_INV_SRCIP 0x08 /* Invert the sense of SRC IP. */ 102 #define IP6T_INV_DSTIP 0x10 /* Invert the sense of DST OP. */ 103 #define IP6T_INV_FRAG 0x20 /* Invert the sense of FRAG. */ 104 #define IP6T_INV_PROTO XT_INV_PROTO 105 #define IP6T_INV_MASK 0x7F /* All possible flag bits mask. */ 106 107 /* This structure defines each of the firewall rules. Consists of 3 108 parts which are 1) general IP header stuff 2) match specific 109 stuff 3) the target to perform if the rule matches */ 110 struct ip6t_entry { 111 struct ip6t_ip6 ipv6; 112 113 /* Mark with fields that we care about. */ 114 unsigned int nfcache; 115 116 /* Size of ipt_entry + matches */ 117 __u16 target_offset; 118 /* Size of ipt_entry + matches + target */ 119 __u16 next_offset; 120 121 /* Back pointer */ 122 unsigned int comefrom; 123 124 /* Packet and byte counters. */ 125 struct xt_counters counters; 126 127 /* The matches (if any), then the target. */ 128 unsigned char elems[0]; 129 }; 130 131 /* Standard entry */ 132 struct ip6t_standard { 133 struct ip6t_entry entry; 134 struct xt_standard_target target; 135 }; 136 137 struct ip6t_error { 138 struct ip6t_entry entry; 139 struct xt_error_target target; 140 }; 141 142 #define IP6T_ENTRY_INIT(__size) \ 143 { \ 144 .target_offset = sizeof(struct ip6t_entry), \ 145 .next_offset = (__size), \ 146 } 147 148 #define IP6T_STANDARD_INIT(__verdict) \ 149 { \ 150 .entry = IP6T_ENTRY_INIT(sizeof(struct ip6t_standard)), \ 151 .target = XT_TARGET_INIT(XT_STANDARD_TARGET, \ 152 sizeof(struct xt_standard_target)), \ 153 .target.verdict = -(__verdict) - 1, \ 154 } 155 156 #define IP6T_ERROR_INIT \ 157 { \ 158 .entry = IP6T_ENTRY_INIT(sizeof(struct ip6t_error)), \ 159 .target = XT_TARGET_INIT(XT_ERROR_TARGET, \ 160 sizeof(struct xt_error_target)), \ 161 .target.errorname = "ERROR", \ 162 } 163 164 /* 165 * New IP firewall options for [gs]etsockopt at the RAW IP level. 166 * Unlike BSD Linux inherits IP options so you don't have to use 167 * a raw socket for this. Instead we check rights in the calls. 168 * 169 * ATTENTION: check linux/in6.h before adding new number here. 170 */ 171 #define IP6T_BASE_CTL 64 172 173 #define IP6T_SO_SET_REPLACE (IP6T_BASE_CTL) 174 #define IP6T_SO_SET_ADD_COUNTERS (IP6T_BASE_CTL + 1) 175 #define IP6T_SO_SET_MAX IP6T_SO_SET_ADD_COUNTERS 176 177 #define IP6T_SO_GET_INFO (IP6T_BASE_CTL) 178 #define IP6T_SO_GET_ENTRIES (IP6T_BASE_CTL + 1) 179 #define IP6T_SO_GET_REVISION_MATCH (IP6T_BASE_CTL + 4) 180 #define IP6T_SO_GET_REVISION_TARGET (IP6T_BASE_CTL + 5) 181 #define IP6T_SO_GET_MAX IP6T_SO_GET_REVISION_TARGET 182 183 /* obtain original address if REDIRECT'd connection */ 184 #define IP6T_SO_ORIGINAL_DST 80 185 186 /* ICMP matching stuff */ 187 struct ip6t_icmp { 188 __u8 type; /* type to match */ 189 __u8 code[2]; /* range of code */ 190 __u8 invflags; /* Inverse flags */ 191 }; 192 193 /* Values for "inv" field for struct ipt_icmp. */ 194 #define IP6T_ICMP_INV 0x01 /* Invert the sense of type/code test */ 195 196 /* The argument to IP6T_SO_GET_INFO */ 197 struct ip6t_getinfo { 198 /* Which table: caller fills this in. */ 199 char name[XT_TABLE_MAXNAMELEN]; 200 201 /* Kernel fills these in. */ 202 /* Which hook entry points are valid: bitmask */ 203 unsigned int valid_hooks; 204 205 /* Hook entry points: one per netfilter hook. */ 206 unsigned int hook_entry[NF_INET_NUMHOOKS]; 207 208 /* Underflow points. */ 209 unsigned int underflow[NF_INET_NUMHOOKS]; 210 211 /* Number of entries */ 212 unsigned int num_entries; 213 214 /* Size of entries. */ 215 unsigned int size; 216 }; 217 218 /* The argument to IP6T_SO_SET_REPLACE. */ 219 struct ip6t_replace { 220 /* Which table. */ 221 char name[XT_TABLE_MAXNAMELEN]; 222 223 /* Which hook entry points are valid: bitmask. You can't 224 change this. */ 225 unsigned int valid_hooks; 226 227 /* Number of entries */ 228 unsigned int num_entries; 229 230 /* Total size of new entries */ 231 unsigned int size; 232 233 /* Hook entry points. */ 234 unsigned int hook_entry[NF_INET_NUMHOOKS]; 235 236 /* Underflow points. */ 237 unsigned int underflow[NF_INET_NUMHOOKS]; 238 239 /* Information about old entries: */ 240 /* Number of counters (must be equal to current number of entries). */ 241 unsigned int num_counters; 242 /* The old entries' counters. */ 243 struct xt_counters __user *counters; 244 245 /* The entries (hang off end: not really an array). */ 246 struct ip6t_entry entries[0]; 247 }; 248 249 /* The argument to IP6T_SO_GET_ENTRIES. */ 250 struct ip6t_get_entries { 251 /* Which table: user fills this in. */ 252 char name[XT_TABLE_MAXNAMELEN]; 253 254 /* User fills this in: total entry size. */ 255 unsigned int size; 256 257 /* The entries. */ 258 struct ip6t_entry entrytable[0]; 259 }; 260 261 /* Helper functions */ 262 static __inline__ struct xt_entry_target * 263 ip6t_get_target(struct ip6t_entry *e) 264 { 265 return (void *)e + e->target_offset; 266 } 267 268 /* 269 * Main firewall chains definitions and global var's definitions. 270 */ 271 272 #endif /* _UAPI_IP6_TABLES_H */ 273
