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/if.h>
21 #include <linux/netfilter_ipv4.h>
22
23 #include <linux/netfilter/x_tables.h>
24
25 #ifndef __KERNEL__
26 #define IPT_FUNCTION_MAXNAMELEN XT_FUNCTION_MAXNAMELEN
27 #define IPT_TABLE_MAXNAMELEN XT_TABLE_MAXNAMELEN
28 #define ipt_match xt_match
29 #define ipt_target xt_target
30 #define ipt_table xt_table
31 #define ipt_get_revision xt_get_revision
32 #define ipt_entry_match xt_entry_match
33 #define ipt_entry_target xt_entry_target
34 #define ipt_standard_target xt_standard_target
35 #define ipt_error_target xt_error_target
36 #define ipt_counters xt_counters
37 #define IPT_CONTINUE XT_CONTINUE
38 #define IPT_RETURN XT_RETURN
39
40 /* This group is older than old (iptables < v1.4.0-rc1~89) */
41 #include <linux/netfilter/xt_tcpudp.h>
42 #define ipt_udp xt_udp
43 #define ipt_tcp xt_tcp
44 #define IPT_TCP_INV_SRCPT XT_TCP_INV_SRCPT
45 #define IPT_TCP_INV_DSTPT XT_TCP_INV_DSTPT
46 #define IPT_TCP_INV_FLAGS XT_TCP_INV_FLAGS
47 #define IPT_TCP_INV_OPTION XT_TCP_INV_OPTION
48 #define IPT_TCP_INV_MASK XT_TCP_INV_MASK
49 #define IPT_UDP_INV_SRCPT XT_UDP_INV_SRCPT
50 #define IPT_UDP_INV_DSTPT XT_UDP_INV_DSTPT
51 #define IPT_UDP_INV_MASK XT_UDP_INV_MASK
52
53 /* The argument to IPT_SO_ADD_COUNTERS. */
54 #define ipt_counters_info xt_counters_info
55 /* Standard return verdict, or do jump. */
56 #define IPT_STANDARD_TARGET XT_STANDARD_TARGET
57 /* Error verdict. */
58 #define IPT_ERROR_TARGET XT_ERROR_TARGET
59
60 /* fn returns 0 to continue iteration */
61 #define IPT_MATCH_ITERATE(e, fn, args...) \
62 XT_MATCH_ITERATE(struct ipt_entry, e, fn, ## args)
63
64 /* fn returns 0 to continue iteration */
65 #define IPT_ENTRY_ITERATE(entries, size, fn, args...) \
66 XT_ENTRY_ITERATE(struct ipt_entry, entries, size, fn, ## args)
67 #endif
68
69 /* Yes, Virginia, you have to zero the padding. */
70 struct ipt_ip {
71 /* Source and destination IP addr */
72 struct in_addr src, dst;
73 /* Mask for src and dest IP addr */
74 struct in_addr smsk, dmsk;
75 char iniface[IFNAMSIZ], outiface[IFNAMSIZ];
76 unsigned char iniface_mask[IFNAMSIZ], outiface_mask[IFNAMSIZ];
77
78 /* Protocol, 0 = ANY */
79 __u16 proto;
80
81 /* Flags word */
82 __u8 flags;
83 /* Inverse flags */
84 __u8 invflags;
85 };
86
87 /* Values for "flag" field in struct ipt_ip (general ip structure). */
88 #define IPT_F_FRAG 0x01 /* Set if rule is a fragment rule */
89 #define IPT_F_GOTO 0x02 /* Set if jump is a goto */
90 #define IPT_F_MASK 0x03 /* All possible flag bits mask. */
91
92 /* Values for "inv" field in struct ipt_ip. */
93 #define IPT_INV_VIA_IN 0x01 /* Invert the sense of IN IFACE. */
94 #define IPT_INV_VIA_OUT 0x02 /* Invert the sense of OUT IFACE */
95 #define IPT_INV_TOS 0x04 /* Invert the sense of TOS. */
96 #define IPT_INV_SRCIP 0x08 /* Invert the sense of SRC IP. */
97 #define IPT_INV_DSTIP 0x10 /* Invert the sense of DST OP. */
98 #define IPT_INV_FRAG 0x20 /* Invert the sense of FRAG. */
99 #define IPT_INV_PROTO XT_INV_PROTO
100 #define IPT_INV_MASK 0x7F /* All possible flag bits mask. */
101
102 /* This structure defines each of the firewall rules. Consists of 3
103 parts which are 1) general IP header stuff 2) match specific
104 stuff 3) the target to perform if the rule matches */
105 struct ipt_entry {
106 struct ipt_ip ip;
107
108 /* Mark with fields that we care about. */
109 unsigned int nfcache;
110
111 /* Size of ipt_entry + matches */
112 __u16 target_offset;
113 /* Size of ipt_entry + matches + target */
114 __u16 next_offset;
115
116 /* Back pointer */
117 unsigned int comefrom;
118
119 /* Packet and byte counters. */
120 struct xt_counters counters;
121
122 /* The matches (if any), then the target. */
123 unsigned char elems[0];
124 };
125
126 /*
127 * New IP firewall options for [gs]etsockopt at the RAW IP level.
128 * Unlike BSD Linux inherits IP options so you don't have to use a raw
129 * socket for this. Instead we check rights in the calls.
130 *
131 * ATTENTION: check linux/in.h before adding new number here.
132 */
133 #define IPT_BASE_CTL 64
134
135 #define IPT_SO_SET_REPLACE (IPT_BASE_CTL)
136 #define IPT_SO_SET_ADD_COUNTERS (IPT_BASE_CTL + 1)
137 #define IPT_SO_SET_MAX IPT_SO_SET_ADD_COUNTERS
138
139 #define IPT_SO_GET_INFO (IPT_BASE_CTL)
140 #define IPT_SO_GET_ENTRIES (IPT_BASE_CTL + 1)
141 #define IPT_SO_GET_REVISION_MATCH (IPT_BASE_CTL + 2)
142 #define IPT_SO_GET_REVISION_TARGET (IPT_BASE_CTL + 3)
143 #define IPT_SO_GET_MAX IPT_SO_GET_REVISION_TARGET
144
145 /* ICMP matching stuff */
146 struct ipt_icmp {
147 __u8 type; /* type to match */
148 __u8 code[2]; /* range of code */
149 __u8 invflags; /* Inverse flags */
150 };
151
152 /* Values for "inv" field for struct ipt_icmp. */
153 #define IPT_ICMP_INV 0x01 /* Invert the sense of type/code test */
154
155 /* The argument to IPT_SO_GET_INFO */
156 struct ipt_getinfo {
157 /* Which table: caller fills this in. */
158 char name[XT_TABLE_MAXNAMELEN];
159
160 /* Kernel fills these in. */
161 /* Which hook entry points are valid: bitmask */
162 unsigned int valid_hooks;
163
164 /* Hook entry points: one per netfilter hook. */
165 unsigned int hook_entry[NF_INET_NUMHOOKS];
166
167 /* Underflow points. */
168 unsigned int underflow[NF_INET_NUMHOOKS];
169
170 /* Number of entries */
171 unsigned int num_entries;
172
173 /* Size of entries. */
174 unsigned int size;
175 };
176
177 /* The argument to IPT_SO_SET_REPLACE. */
178 struct ipt_replace {
179 /* Which table. */
180 char name[XT_TABLE_MAXNAMELEN];
181
182 /* Which hook entry points are valid: bitmask. You can't
183 change this. */
184 unsigned int valid_hooks;
185
186 /* Number of entries */
187 unsigned int num_entries;
188
189 /* Total size of new entries */
190 unsigned int size;
191
192 /* Hook entry points. */
193 unsigned int hook_entry[NF_INET_NUMHOOKS];
194
195 /* Underflow points. */
196 unsigned int underflow[NF_INET_NUMHOOKS];
197
198 /* Information about old entries: */
199 /* Number of counters (must be equal to current number of entries). */
200 unsigned int num_counters;
201 /* The old entries' counters. */
202 struct xt_counters __user *counters;
203
204 /* The entries (hang off end: not really an array). */
205 struct ipt_entry entries[0];
206 };
207
208 /* The argument to IPT_SO_GET_ENTRIES. */
209 struct ipt_get_entries {
210 /* Which table: user fills this in. */
211 char name[XT_TABLE_MAXNAMELEN];
212
213 /* User fills this in: total entry size. */
214 unsigned int size;
215
216 /* The entries. */
217 struct ipt_entry entrytable[0];
218 };
219
220 /* Helper functions */
221 static __inline__ struct xt_entry_target *
222 ipt_get_target(struct ipt_entry *e)
223 {
224 return (void *)e + e->target_offset;
225 }
226
227 /*
228 * Main firewall chains definitions and global var's definitions.
229 */
230 #endif /* _UAPI_IPTABLES_H */
231
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