2 * 25-Jul-1998 Major changes to allow for ip chain table
4 * 3-Jan-2000 Named tables to allow packet selection for different uses.
8 * Format of an IP firewall descriptor
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.
18 #include <linux/types.h>
20 #include <linux/netfilter_ipv4.h>
22 #include <linux/netfilter/x_tables.h>
24 #define IPT_FUNCTION_MAXNAMELEN XT_FUNCTION_MAXNAMELEN
25 #define IPT_TABLE_MAXNAMELEN XT_TABLE_MAXNAMELEN
26 #define ipt_match xt_match
27 #define ipt_target xt_target
28 #define ipt_table xt_table
29 #define ipt_get_revision xt_get_revision
31 /* Yes, Virginia, you have to zero the padding. */
33 /* Source and destination IP addr */
34 struct in_addr src, dst;
35 /* Mask for src and dest IP addr */
36 struct in_addr smsk, dmsk;
37 char iniface[IFNAMSIZ], outiface[IFNAMSIZ];
38 unsigned char iniface_mask[IFNAMSIZ], outiface_mask[IFNAMSIZ];
40 /* Protocol, 0 = ANY */
49 #define ipt_entry_match xt_entry_match
50 #define ipt_entry_target xt_entry_target
51 #define ipt_standard_target xt_standard_target
53 #define ipt_counters xt_counters
55 /* Values for "flag" field in struct ipt_ip (general ip structure). */
56 #define IPT_F_FRAG 0x01 /* Set if rule is a fragment rule */
57 #define IPT_F_GOTO 0x02 /* Set if jump is a goto */
58 #define IPT_F_MASK 0x03 /* All possible flag bits mask. */
60 /* Values for "inv" field in struct ipt_ip. */
61 #define IPT_INV_VIA_IN 0x01 /* Invert the sense of IN IFACE. */
62 #define IPT_INV_VIA_OUT 0x02 /* Invert the sense of OUT IFACE */
63 #define IPT_INV_TOS 0x04 /* Invert the sense of TOS. */
64 #define IPT_INV_SRCIP 0x08 /* Invert the sense of SRC IP. */
65 #define IPT_INV_DSTIP 0x10 /* Invert the sense of DST OP. */
66 #define IPT_INV_FRAG 0x20 /* Invert the sense of FRAG. */
67 #define IPT_INV_PROTO XT_INV_PROTO
68 #define IPT_INV_MASK 0x7F /* All possible flag bits mask. */
70 /* This structure defines each of the firewall rules. Consists of 3
71 parts which are 1) general IP header stuff 2) match specific
72 stuff 3) the target to perform if the rule matches */
77 /* Mark with fields that we care about. */
80 /* Size of ipt_entry + matches */
81 u_int16_t target_offset;
82 /* Size of ipt_entry + matches + target */
83 u_int16_t next_offset;
86 unsigned int comefrom;
88 /* Packet and byte counters. */
89 struct xt_counters counters;
91 /* The matches (if any), then the target. */
92 unsigned char elems[0];
96 * New IP firewall options for [gs]etsockopt at the RAW IP level.
97 * Unlike BSD Linux inherits IP options so you don't have to use a raw
98 * socket for this. Instead we check rights in the calls.
100 * ATTENTION: check linux/in.h before adding new number here.
102 #define IPT_BASE_CTL 64
104 #define IPT_SO_SET_REPLACE (IPT_BASE_CTL)
105 #define IPT_SO_SET_ADD_COUNTERS (IPT_BASE_CTL + 1)
106 #define IPT_SO_SET_MAX IPT_SO_SET_ADD_COUNTERS
108 #define IPT_SO_GET_INFO (IPT_BASE_CTL)
109 #define IPT_SO_GET_ENTRIES (IPT_BASE_CTL + 1)
110 #define IPT_SO_GET_REVISION_MATCH (IPT_BASE_CTL + 2)
111 #define IPT_SO_GET_REVISION_TARGET (IPT_BASE_CTL + 3)
112 #define IPT_SO_GET_MAX IPT_SO_GET_REVISION_TARGET
114 #define IPT_CONTINUE XT_CONTINUE
115 #define IPT_RETURN XT_RETURN
117 #include <linux/netfilter/xt_tcpudp.h>
118 #define ipt_udp xt_udp
119 #define ipt_tcp xt_tcp
121 #define IPT_TCP_INV_SRCPT XT_TCP_INV_SRCPT
122 #define IPT_TCP_INV_DSTPT XT_TCP_INV_DSTPT
123 #define IPT_TCP_INV_FLAGS XT_TCP_INV_FLAGS
124 #define IPT_TCP_INV_OPTION XT_TCP_INV_OPTION
125 #define IPT_TCP_INV_MASK XT_TCP_INV_MASK
127 #define IPT_UDP_INV_SRCPT XT_UDP_INV_SRCPT
128 #define IPT_UDP_INV_DSTPT XT_UDP_INV_DSTPT
129 #define IPT_UDP_INV_MASK XT_UDP_INV_MASK
131 /* ICMP matching stuff */
134 u_int8_t type; /* type to match */
135 u_int8_t code[2]; /* range of code */
136 u_int8_t invflags; /* Inverse flags */
139 /* Values for "inv" field for struct ipt_icmp. */
140 #define IPT_ICMP_INV 0x01 /* Invert the sense of type/code test */
142 /* The argument to IPT_SO_GET_INFO */
145 /* Which table: caller fills this in. */
146 char name[IPT_TABLE_MAXNAMELEN];
148 /* Kernel fills these in. */
149 /* Which hook entry points are valid: bitmask */
150 unsigned int valid_hooks;
152 /* Hook entry points: one per netfilter hook. */
153 unsigned int hook_entry[NF_INET_NUMHOOKS];
155 /* Underflow points. */
156 unsigned int underflow[NF_INET_NUMHOOKS];
158 /* Number of entries */
159 unsigned int num_entries;
161 /* Size of entries. */
165 /* The argument to IPT_SO_SET_REPLACE. */
169 char name[IPT_TABLE_MAXNAMELEN];
171 /* Which hook entry points are valid: bitmask. You can't
173 unsigned int valid_hooks;
175 /* Number of entries */
176 unsigned int num_entries;
178 /* Total size of new entries */
181 /* Hook entry points. */
182 unsigned int hook_entry[NF_INET_NUMHOOKS];
184 /* Underflow points. */
185 unsigned int underflow[NF_INET_NUMHOOKS];
187 /* Information about old entries: */
188 /* Number of counters (must be equal to current number of entries). */
189 unsigned int num_counters;
190 /* The old entries' counters. */
191 struct xt_counters *counters;
193 /* The entries (hang off end: not really an array). */
194 struct ipt_entry entries[0];
197 /* The argument to IPT_SO_ADD_COUNTERS. */
198 #define ipt_counters_info xt_counters_info
200 /* The argument to IPT_SO_GET_ENTRIES. */
201 struct ipt_get_entries
203 /* Which table: user fills this in. */
204 char name[IPT_TABLE_MAXNAMELEN];
206 /* User fills this in: total entry size. */
210 struct ipt_entry entrytable[0];
213 /* Standard return verdict, or do jump. */
214 #define IPT_STANDARD_TARGET XT_STANDARD_TARGET
216 #define IPT_ERROR_TARGET XT_ERROR_TARGET
218 /* Helper functions */
219 static __inline__ struct ipt_entry_target *
220 ipt_get_target(struct ipt_entry *e)
222 return (void *)e + e->target_offset;
225 /* fn returns 0 to continue iteration */
226 #define IPT_MATCH_ITERATE(e, fn, args...) \
227 XT_MATCH_ITERATE(struct ipt_entry, e, fn, ## args)
229 /* fn returns 0 to continue iteration */
230 #define IPT_ENTRY_ITERATE(entries, size, fn, args...) \
231 XT_ENTRY_ITERATE(struct ipt_entry, entries, size, fn, ## args)
234 * Main firewall chains definitions and global var's definitions.
236 #endif /* _IPTABLES_H */