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 IP 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_IPTABLES_H 17 #define _UAPI_IPTABLES_H 18 19 #include <linux/types.h> 20 #include <linux/compiler.h> 21 #include <linux/if.h> 22 #include <linux/netfilter_ipv4.h> 23 24 #include <linux/netfilter/x_tables.h> 25 26 #ifndef __KERNEL__ 27 #define IPT_FUNCTION_MAXNAMELEN XT_FUNCTION_MAXNAMELEN 28 #define IPT_TABLE_MAXNAMELEN XT_TABLE_MAXNAMELEN 29 #define ipt_match xt_match 30 #define ipt_target xt_target 31 #define ipt_table xt_table 32 #define ipt_get_revision xt_get_revision 33 #define ipt_entry_match xt_entry_match 34 #define ipt_entry_target xt_entry_target 35 #define ipt_standard_target xt_standard_target 36 #define ipt_error_target xt_error_target 37 #define ipt_counters xt_counters 38 #define IPT_CONTINUE XT_CONTINUE 39 #define IPT_RETURN XT_RETURN 40 41 /* This group is older than old (iptables < v1.4.0-rc1~89) */ 42 #include <linux/netfilter/xt_tcpudp.h> 43 #define ipt_udp xt_udp 44 #define ipt_tcp xt_tcp 45 #define IPT_TCP_INV_SRCPT XT_TCP_INV_SRCPT 46 #define IPT_TCP_INV_DSTPT XT_TCP_INV_DSTPT 47 #define IPT_TCP_INV_FLAGS XT_TCP_INV_FLAGS 48 #define IPT_TCP_INV_OPTION XT_TCP_INV_OPTION 49 #define IPT_TCP_INV_MASK XT_TCP_INV_MASK 50 #define IPT_UDP_INV_SRCPT XT_UDP_INV_SRCPT 51 #define IPT_UDP_INV_DSTPT XT_UDP_INV_DSTPT 52 #define IPT_UDP_INV_MASK XT_UDP_INV_MASK 53 54 /* The argument to IPT_SO_ADD_COUNTERS. */ 55 #define ipt_counters_info xt_counters_info 56 /* Standard return verdict, or do jump. */ 57 #define IPT_STANDARD_TARGET XT_STANDARD_TARGET 58 /* Error verdict. */ 59 #define IPT_ERROR_TARGET XT_ERROR_TARGET 60 61 /* fn returns 0 to continue iteration */ 62 #define IPT_MATCH_ITERATE(e, fn, args...) \ 63 XT_MATCH_ITERATE(struct ipt_entry, e, fn, ## args) 64 65 /* fn returns 0 to continue iteration */ 66 #define IPT_ENTRY_ITERATE(entries, size, fn, args...) \ 67 XT_ENTRY_ITERATE(struct ipt_entry, entries, size, fn, ## args) 68 #endif 69 70 /* Yes, Virginia, you have to zero the padding. */ 71 struct ipt_ip { 72 /* Source and destination IP addr */ 73 struct in_addr src, dst; 74 /* Mask for src and dest IP addr */ 75 struct in_addr smsk, dmsk; 76 char iniface[IFNAMSIZ], outiface[IFNAMSIZ]; 77 unsigned char iniface_mask[IFNAMSIZ], outiface_mask[IFNAMSIZ]; 78 79 /* Protocol, 0 = ANY */ 80 __u16 proto; 81 82 /* Flags word */ 83 __u8 flags; 84 /* Inverse flags */ 85 __u8 invflags; 86 }; 87 88 /* Values for "flag" field in struct ipt_ip (general ip structure). */ 89 #define IPT_F_FRAG 0x01 /* Set if rule is a fragment rule */ 90 #define IPT_F_GOTO 0x02 /* Set if jump is a goto */ 91 #define IPT_F_MASK 0x03 /* All possible flag bits mask. */ 92 93 /* Values for "inv" field in struct ipt_ip. */ 94 #define IPT_INV_VIA_IN 0x01 /* Invert the sense of IN IFACE. */ 95 #define IPT_INV_VIA_OUT 0x02 /* Invert the sense of OUT IFACE */ 96 #define IPT_INV_TOS 0x04 /* Invert the sense of TOS. */ 97 #define IPT_INV_SRCIP 0x08 /* Invert the sense of SRC IP. */ 98 #define IPT_INV_DSTIP 0x10 /* Invert the sense of DST OP. */ 99 #define IPT_INV_FRAG 0x20 /* Invert the sense of FRAG. */ 100 #define IPT_INV_PROTO XT_INV_PROTO 101 #define IPT_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 ipt_entry { 107 struct ipt_ip ip; 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[]; 125 }; 126 127 /* 128 * New IP firewall options for [gs]etsockopt at the RAW IP level. 129 * Unlike BSD Linux inherits IP options so you don't have to use a raw 130 * socket for this. Instead we check rights in the calls. 131 * 132 * ATTENTION: check linux/in.h before adding new number here. 133 */ 134 #define IPT_BASE_CTL 64 135 136 #define IPT_SO_SET_REPLACE (IPT_BASE_CTL) 137 #define IPT_SO_SET_ADD_COUNTERS (IPT_BASE_CTL + 1) 138 #define IPT_SO_SET_MAX IPT_SO_SET_ADD_COUNTERS 139 140 #define IPT_SO_GET_INFO (IPT_BASE_CTL) 141 #define IPT_SO_GET_ENTRIES (IPT_BASE_CTL + 1) 142 #define IPT_SO_GET_REVISION_MATCH (IPT_BASE_CTL + 2) 143 #define IPT_SO_GET_REVISION_TARGET (IPT_BASE_CTL + 3) 144 #define IPT_SO_GET_MAX IPT_SO_GET_REVISION_TARGET 145 146 /* ICMP matching stuff */ 147 struct ipt_icmp { 148 __u8 type; /* type to match */ 149 __u8 code[2]; /* range of code */ 150 __u8 invflags; /* Inverse flags */ 151 }; 152 153 /* Values for "inv" field for struct ipt_icmp. */ 154 #define IPT_ICMP_INV 0x01 /* Invert the sense of type/code test */ 155 156 /* The argument to IPT_SO_GET_INFO */ 157 struct ipt_getinfo { 158 /* Which table: caller fills this in. */ 159 char name[XT_TABLE_MAXNAMELEN]; 160 161 /* Kernel fills these in. */ 162 /* Which hook entry points are valid: bitmask */ 163 unsigned int valid_hooks; 164 165 /* Hook entry points: one per netfilter hook. */ 166 unsigned int hook_entry[NF_INET_NUMHOOKS]; 167 168 /* Underflow points. */ 169 unsigned int underflow[NF_INET_NUMHOOKS]; 170 171 /* Number of entries */ 172 unsigned int num_entries; 173 174 /* Size of entries. */ 175 unsigned int size; 176 }; 177 178 /* The argument to IPT_SO_SET_REPLACE. */ 179 struct ipt_replace { 180 /* Which table. */ 181 char name[XT_TABLE_MAXNAMELEN]; 182 183 /* Which hook entry points are valid: bitmask. You can't 184 change this. */ 185 unsigned int valid_hooks; 186 187 /* Number of entries */ 188 unsigned int num_entries; 189 190 /* Total size of new entries */ 191 unsigned int size; 192 193 /* Hook entry points. */ 194 unsigned int hook_entry[NF_INET_NUMHOOKS]; 195 196 /* Underflow points. */ 197 unsigned int underflow[NF_INET_NUMHOOKS]; 198 199 /* Information about old entries: */ 200 /* Number of counters (must be equal to current number of entries). */ 201 unsigned int num_counters; 202 /* The old entries' counters. */ 203 struct xt_counters __user *counters; 204 205 /* The entries (hang off end: not really an array). */ 206 struct ipt_entry entries[]; 207 }; 208 209 /* The argument to IPT_SO_GET_ENTRIES. */ 210 struct ipt_get_entries { 211 /* Which table: user fills this in. */ 212 char name[XT_TABLE_MAXNAMELEN]; 213 214 /* User fills this in: total entry size. */ 215 unsigned int size; 216 217 /* The entries. */ 218 struct ipt_entry entrytable[]; 219 }; 220 221 /* Helper functions */ 222 static __inline__ struct xt_entry_target * 223 ipt_get_target(struct ipt_entry *e) 224 { 225 return (struct xt_entry_target *)((char *)e + e->target_offset); 226 } 227 228 /* 229 * Main firewall chains definitions and global var's definitions. 230 */ 231 #endif /* _UAPI_IPTABLES_H */ 232