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 | |