Ben Cheng | 30692c6 | 2013-10-15 18:26:18 -0700 | [diff] [blame^] | 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 IP 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_IPTABLES_H |
| 16 | #define _UAPI_IPTABLES_H |
| 17 | |
| 18 | #include <linux/types.h> |
| 19 | #include <linux/compiler.h> |
| 20 | #include <linux/netfilter_ipv4.h> |
| 21 | |
| 22 | #include <linux/netfilter/x_tables.h> |
| 23 | |
| 24 | #ifndef __KERNEL__ |
| 25 | #define IPT_FUNCTION_MAXNAMELEN XT_FUNCTION_MAXNAMELEN |
| 26 | #define IPT_TABLE_MAXNAMELEN XT_TABLE_MAXNAMELEN |
| 27 | #define ipt_match xt_match |
| 28 | #define ipt_target xt_target |
| 29 | #define ipt_table xt_table |
| 30 | #define ipt_get_revision xt_get_revision |
| 31 | #define ipt_entry_match xt_entry_match |
| 32 | #define ipt_entry_target xt_entry_target |
| 33 | #define ipt_standard_target xt_standard_target |
| 34 | #define ipt_error_target xt_error_target |
| 35 | #define ipt_counters xt_counters |
| 36 | #define IPT_CONTINUE XT_CONTINUE |
| 37 | #define IPT_RETURN XT_RETURN |
| 38 | |
| 39 | /* This group is older than old (iptables < v1.4.0-rc1~89) */ |
| 40 | #include <linux/netfilter/xt_tcpudp.h> |
| 41 | #define ipt_udp xt_udp |
| 42 | #define ipt_tcp xt_tcp |
| 43 | #define IPT_TCP_INV_SRCPT XT_TCP_INV_SRCPT |
| 44 | #define IPT_TCP_INV_DSTPT XT_TCP_INV_DSTPT |
| 45 | #define IPT_TCP_INV_FLAGS XT_TCP_INV_FLAGS |
| 46 | #define IPT_TCP_INV_OPTION XT_TCP_INV_OPTION |
| 47 | #define IPT_TCP_INV_MASK XT_TCP_INV_MASK |
| 48 | #define IPT_UDP_INV_SRCPT XT_UDP_INV_SRCPT |
| 49 | #define IPT_UDP_INV_DSTPT XT_UDP_INV_DSTPT |
| 50 | #define IPT_UDP_INV_MASK XT_UDP_INV_MASK |
| 51 | |
| 52 | /* The argument to IPT_SO_ADD_COUNTERS. */ |
| 53 | #define ipt_counters_info xt_counters_info |
| 54 | /* Standard return verdict, or do jump. */ |
| 55 | #define IPT_STANDARD_TARGET XT_STANDARD_TARGET |
| 56 | /* Error verdict. */ |
| 57 | #define IPT_ERROR_TARGET XT_ERROR_TARGET |
| 58 | |
| 59 | /* fn returns 0 to continue iteration */ |
| 60 | #define IPT_MATCH_ITERATE(e, fn, args...) \ |
| 61 | XT_MATCH_ITERATE(struct ipt_entry, e, fn, ## args) |
| 62 | |
| 63 | /* fn returns 0 to continue iteration */ |
| 64 | #define IPT_ENTRY_ITERATE(entries, size, fn, args...) \ |
| 65 | XT_ENTRY_ITERATE(struct ipt_entry, entries, size, fn, ## args) |
| 66 | #endif |
| 67 | |
| 68 | /* Yes, Virginia, you have to zero the padding. */ |
| 69 | struct ipt_ip { |
| 70 | /* Source and destination IP addr */ |
| 71 | struct in_addr src, dst; |
| 72 | /* Mask for src and dest IP addr */ |
| 73 | struct in_addr smsk, dmsk; |
| 74 | char iniface[IFNAMSIZ], outiface[IFNAMSIZ]; |
| 75 | unsigned char iniface_mask[IFNAMSIZ], outiface_mask[IFNAMSIZ]; |
| 76 | |
| 77 | /* Protocol, 0 = ANY */ |
| 78 | __u16 proto; |
| 79 | |
| 80 | /* Flags word */ |
| 81 | __u8 flags; |
| 82 | /* Inverse flags */ |
| 83 | __u8 invflags; |
| 84 | }; |
| 85 | |
| 86 | /* Values for "flag" field in struct ipt_ip (general ip structure). */ |
| 87 | #define IPT_F_FRAG 0x01 /* Set if rule is a fragment rule */ |
| 88 | #define IPT_F_GOTO 0x02 /* Set if jump is a goto */ |
| 89 | #define IPT_F_MASK 0x03 /* All possible flag bits mask. */ |
| 90 | |
| 91 | /* Values for "inv" field in struct ipt_ip. */ |
| 92 | #define IPT_INV_VIA_IN 0x01 /* Invert the sense of IN IFACE. */ |
| 93 | #define IPT_INV_VIA_OUT 0x02 /* Invert the sense of OUT IFACE */ |
| 94 | #define IPT_INV_TOS 0x04 /* Invert the sense of TOS. */ |
| 95 | #define IPT_INV_SRCIP 0x08 /* Invert the sense of SRC IP. */ |
| 96 | #define IPT_INV_DSTIP 0x10 /* Invert the sense of DST OP. */ |
| 97 | #define IPT_INV_FRAG 0x20 /* Invert the sense of FRAG. */ |
| 98 | #define IPT_INV_PROTO XT_INV_PROTO |
| 99 | #define IPT_INV_MASK 0x7F /* All possible flag bits mask. */ |
| 100 | |
| 101 | /* This structure defines each of the firewall rules. Consists of 3 |
| 102 | parts which are 1) general IP header stuff 2) match specific |
| 103 | stuff 3) the target to perform if the rule matches */ |
| 104 | struct ipt_entry { |
| 105 | struct ipt_ip ip; |
| 106 | |
| 107 | /* Mark with fields that we care about. */ |
| 108 | unsigned int nfcache; |
| 109 | |
| 110 | /* Size of ipt_entry + matches */ |
| 111 | __u16 target_offset; |
| 112 | /* Size of ipt_entry + matches + target */ |
| 113 | __u16 next_offset; |
| 114 | |
| 115 | /* Back pointer */ |
| 116 | unsigned int comefrom; |
| 117 | |
| 118 | /* Packet and byte counters. */ |
| 119 | struct xt_counters counters; |
| 120 | |
| 121 | /* The matches (if any), then the target. */ |
| 122 | unsigned char elems[0]; |
| 123 | }; |
| 124 | |
| 125 | /* |
| 126 | * New IP firewall options for [gs]etsockopt at the RAW IP level. |
| 127 | * Unlike BSD Linux inherits IP options so you don't have to use a raw |
| 128 | * socket for this. Instead we check rights in the calls. |
| 129 | * |
| 130 | * ATTENTION: check linux/in.h before adding new number here. |
| 131 | */ |
| 132 | #define IPT_BASE_CTL 64 |
| 133 | |
| 134 | #define IPT_SO_SET_REPLACE (IPT_BASE_CTL) |
| 135 | #define IPT_SO_SET_ADD_COUNTERS (IPT_BASE_CTL + 1) |
| 136 | #define IPT_SO_SET_MAX IPT_SO_SET_ADD_COUNTERS |
| 137 | |
| 138 | #define IPT_SO_GET_INFO (IPT_BASE_CTL) |
| 139 | #define IPT_SO_GET_ENTRIES (IPT_BASE_CTL + 1) |
| 140 | #define IPT_SO_GET_REVISION_MATCH (IPT_BASE_CTL + 2) |
| 141 | #define IPT_SO_GET_REVISION_TARGET (IPT_BASE_CTL + 3) |
| 142 | #define IPT_SO_GET_MAX IPT_SO_GET_REVISION_TARGET |
| 143 | |
| 144 | /* ICMP matching stuff */ |
| 145 | struct ipt_icmp { |
| 146 | __u8 type; /* type to match */ |
| 147 | __u8 code[2]; /* range of code */ |
| 148 | __u8 invflags; /* Inverse flags */ |
| 149 | }; |
| 150 | |
| 151 | /* Values for "inv" field for struct ipt_icmp. */ |
| 152 | #define IPT_ICMP_INV 0x01 /* Invert the sense of type/code test */ |
| 153 | |
| 154 | /* The argument to IPT_SO_GET_INFO */ |
| 155 | struct ipt_getinfo { |
| 156 | /* Which table: caller fills this in. */ |
| 157 | char name[XT_TABLE_MAXNAMELEN]; |
| 158 | |
| 159 | /* Kernel fills these in. */ |
| 160 | /* Which hook entry points are valid: bitmask */ |
| 161 | unsigned int valid_hooks; |
| 162 | |
| 163 | /* Hook entry points: one per netfilter hook. */ |
| 164 | unsigned int hook_entry[NF_INET_NUMHOOKS]; |
| 165 | |
| 166 | /* Underflow points. */ |
| 167 | unsigned int underflow[NF_INET_NUMHOOKS]; |
| 168 | |
| 169 | /* Number of entries */ |
| 170 | unsigned int num_entries; |
| 171 | |
| 172 | /* Size of entries. */ |
| 173 | unsigned int size; |
| 174 | }; |
| 175 | |
| 176 | /* The argument to IPT_SO_SET_REPLACE. */ |
| 177 | struct ipt_replace { |
| 178 | /* Which table. */ |
| 179 | char name[XT_TABLE_MAXNAMELEN]; |
| 180 | |
| 181 | /* Which hook entry points are valid: bitmask. You can't |
| 182 | change this. */ |
| 183 | unsigned int valid_hooks; |
| 184 | |
| 185 | /* Number of entries */ |
| 186 | unsigned int num_entries; |
| 187 | |
| 188 | /* Total size of new entries */ |
| 189 | unsigned int size; |
| 190 | |
| 191 | /* Hook entry points. */ |
| 192 | unsigned int hook_entry[NF_INET_NUMHOOKS]; |
| 193 | |
| 194 | /* Underflow points. */ |
| 195 | unsigned int underflow[NF_INET_NUMHOOKS]; |
| 196 | |
| 197 | /* Information about old entries: */ |
| 198 | /* Number of counters (must be equal to current number of entries). */ |
| 199 | unsigned int num_counters; |
| 200 | /* The old entries' counters. */ |
| 201 | struct xt_counters __user *counters; |
| 202 | |
| 203 | /* The entries (hang off end: not really an array). */ |
| 204 | struct ipt_entry entries[0]; |
| 205 | }; |
| 206 | |
| 207 | /* The argument to IPT_SO_GET_ENTRIES. */ |
| 208 | struct ipt_get_entries { |
| 209 | /* Which table: user fills this in. */ |
| 210 | char name[XT_TABLE_MAXNAMELEN]; |
| 211 | |
| 212 | /* User fills this in: total entry size. */ |
| 213 | unsigned int size; |
| 214 | |
| 215 | /* The entries. */ |
| 216 | struct ipt_entry entrytable[0]; |
| 217 | }; |
| 218 | |
| 219 | /* Helper functions */ |
| 220 | static __inline__ struct xt_entry_target * |
| 221 | ipt_get_target(struct ipt_entry *e) |
| 222 | { |
| 223 | return (void *)e + e->target_offset; |
| 224 | } |
| 225 | |
| 226 | /* |
| 227 | * Main firewall chains definitions and global var's definitions. |
| 228 | */ |
| 229 | #endif /* _UAPI_IPTABLES_H */ |