1 /* 2 * Format of an ARP firewall descriptor 3 * 4 * src, tgt, src_mask, tgt_mask, arpop, arpop_mask are always stored in 5 * network byte order. 6 * flags are stored in host byte order (of course). 7 */ 8 9 #ifndef _UAPI_ARPTABLES_H 10 #define _UAPI_ARPTABLES_H 11 12 #include <linux/types.h> 13 #include <linux/compiler.h> 14 #include <linux/netfilter_arp.h> 15 16 #include <linux/netfilter/x_tables.h> 17 18 #ifndef __KERNEL__ 19 #define ARPT_FUNCTION_MAXNAMELEN XT_FUNCTION_MAXNAMELEN 20 #define ARPT_TABLE_MAXNAMELEN XT_TABLE_MAXNAMELEN 21 #define arpt_entry_target xt_entry_target 22 #define arpt_standard_target xt_standard_target 23 #define arpt_error_target xt_error_target 24 #define ARPT_CONTINUE XT_CONTINUE 25 #define ARPT_RETURN XT_RETURN 26 #define arpt_counters_info xt_counters_info 27 #define arpt_counters xt_counters 28 #define ARPT_STANDARD_TARGET XT_STANDARD_TARGET 29 #define ARPT_ERROR_TARGET XT_ERROR_TARGET 30 #define ARPT_ENTRY_ITERATE(entries, size, fn, args...) \ 31 XT_ENTRY_ITERATE(struct arpt_entry, entries, size, fn, ## args) 32 #endif 33 34 #define ARPT_DEV_ADDR_LEN_MAX 16 35 36 struct arpt_devaddr_info { 37 char addr[ARPT_DEV_ADDR_LEN_MAX]; 38 char mask[ARPT_DEV_ADDR_LEN_MAX]; 39 }; 40 41 /* Yes, Virginia, you have to zero the padding. */ 42 struct arpt_arp { 43 /* Source and target IP addr */ 44 struct in_addr src, tgt; 45 /* Mask for src and target IP addr */ 46 struct in_addr smsk, tmsk; 47 48 /* Device hw address length, src+target device addresses */ 49 __u8 arhln, arhln_mask; 50 struct arpt_devaddr_info src_devaddr; 51 struct arpt_devaddr_info tgt_devaddr; 52 53 /* ARP operation code. */ 54 __be16 arpop, arpop_mask; 55 56 /* ARP hardware address and protocol address format. */ 57 __be16 arhrd, arhrd_mask; 58 __be16 arpro, arpro_mask; 59 60 /* The protocol address length is only accepted if it is 4 61 * so there is no use in offering a way to do filtering on it. 62 */ 63 64 char iniface[IFNAMSIZ], outiface[IFNAMSIZ]; 65 unsigned char iniface_mask[IFNAMSIZ], outiface_mask[IFNAMSIZ]; 66 67 /* Flags word */ 68 __u8 flags; 69 /* Inverse flags */ 70 __u16 invflags; 71 }; 72 73 /* Values for "flag" field in struct arpt_ip (general arp structure). 74 * No flags defined yet. 75 */ 76 #define ARPT_F_MASK 0x00 /* All possible flag bits mask. */ 77 78 /* Values for "inv" field in struct arpt_arp. */ 79 #define ARPT_INV_VIA_IN 0x0001 /* Invert the sense of IN IFACE. */ 80 #define ARPT_INV_VIA_OUT 0x0002 /* Invert the sense of OUT IFACE */ 81 #define ARPT_INV_SRCIP 0x0004 /* Invert the sense of SRC IP. */ 82 #define ARPT_INV_TGTIP 0x0008 /* Invert the sense of TGT IP. */ 83 #define ARPT_INV_SRCDEVADDR 0x0010 /* Invert the sense of SRC DEV ADDR. */ 84 #define ARPT_INV_TGTDEVADDR 0x0020 /* Invert the sense of TGT DEV ADDR. */ 85 #define ARPT_INV_ARPOP 0x0040 /* Invert the sense of ARP OP. */ 86 #define ARPT_INV_ARPHRD 0x0080 /* Invert the sense of ARP HRD. */ 87 #define ARPT_INV_ARPPRO 0x0100 /* Invert the sense of ARP PRO. */ 88 #define ARPT_INV_ARPHLN 0x0200 /* Invert the sense of ARP HLN. */ 89 #define ARPT_INV_MASK 0x03FF /* All possible flag bits mask. */ 90 91 /* This structure defines each of the firewall rules. Consists of 3 92 parts which are 1) general ARP header stuff 2) match specific 93 stuff 3) the target to perform if the rule matches */ 94 struct arpt_entry 95 { 96 struct arpt_arp arp; 97 98 /* Size of arpt_entry + matches */ 99 __u16 target_offset; 100 /* Size of arpt_entry + matches + target */ 101 __u16 next_offset; 102 103 /* Back pointer */ 104 unsigned int comefrom; 105 106 /* Packet and byte counters. */ 107 struct xt_counters counters; 108 109 /* The matches (if any), then the target. */ 110 unsigned char elems[0]; 111 }; 112 113 /* 114 * New IP firewall options for [gs]etsockopt at the RAW IP level. 115 * Unlike BSD Linux inherits IP options so you don't have to use a raw 116 * socket for this. Instead we check rights in the calls. 117 * 118 * ATTENTION: check linux/in.h before adding new number here. 119 */ 120 #define ARPT_BASE_CTL 96 121 122 #define ARPT_SO_SET_REPLACE (ARPT_BASE_CTL) 123 #define ARPT_SO_SET_ADD_COUNTERS (ARPT_BASE_CTL + 1) 124 #define ARPT_SO_SET_MAX ARPT_SO_SET_ADD_COUNTERS 125 126 #define ARPT_SO_GET_INFO (ARPT_BASE_CTL) 127 #define ARPT_SO_GET_ENTRIES (ARPT_BASE_CTL + 1) 128 /* #define ARPT_SO_GET_REVISION_MATCH (APRT_BASE_CTL + 2) */ 129 #define ARPT_SO_GET_REVISION_TARGET (ARPT_BASE_CTL + 3) 130 #define ARPT_SO_GET_MAX (ARPT_SO_GET_REVISION_TARGET) 131 132 /* The argument to ARPT_SO_GET_INFO */ 133 struct arpt_getinfo { 134 /* Which table: caller fills this in. */ 135 char name[XT_TABLE_MAXNAMELEN]; 136 137 /* Kernel fills these in. */ 138 /* Which hook entry points are valid: bitmask */ 139 unsigned int valid_hooks; 140 141 /* Hook entry points: one per netfilter hook. */ 142 unsigned int hook_entry[NF_ARP_NUMHOOKS]; 143 144 /* Underflow points. */ 145 unsigned int underflow[NF_ARP_NUMHOOKS]; 146 147 /* Number of entries */ 148 unsigned int num_entries; 149 150 /* Size of entries. */ 151 unsigned int size; 152 }; 153 154 /* The argument to ARPT_SO_SET_REPLACE. */ 155 struct arpt_replace { 156 /* Which table. */ 157 char name[XT_TABLE_MAXNAMELEN]; 158 159 /* Which hook entry points are valid: bitmask. You can't 160 change this. */ 161 unsigned int valid_hooks; 162 163 /* Number of entries */ 164 unsigned int num_entries; 165 166 /* Total size of new entries */ 167 unsigned int size; 168 169 /* Hook entry points. */ 170 unsigned int hook_entry[NF_ARP_NUMHOOKS]; 171 172 /* Underflow points. */ 173 unsigned int underflow[NF_ARP_NUMHOOKS]; 174 175 /* Information about old entries: */ 176 /* Number of counters (must be equal to current number of entries). */ 177 unsigned int num_counters; 178 /* The old entries' counters. */ 179 struct xt_counters __user *counters; 180 181 /* The entries (hang off end: not really an array). */ 182 struct arpt_entry entries[0]; 183 }; 184 185 /* The argument to ARPT_SO_GET_ENTRIES. */ 186 struct arpt_get_entries { 187 /* Which table: user fills this in. */ 188 char name[XT_TABLE_MAXNAMELEN]; 189 190 /* User fills this in: total entry size. */ 191 unsigned int size; 192 193 /* The entries. */ 194 struct arpt_entry entrytable[0]; 195 }; 196 197 /* Helper functions */ 198 static __inline__ struct xt_entry_target *arpt_get_target(struct arpt_entry *e) 199 { 200 return (void *)e + e->target_offset; 201 } 202 203 /* 204 * Main firewall chains definitions and global var's definitions. 205 */ 206 #endif /* _UAPI_ARPTABLES_H */ 207
