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 IP6 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_IP6_TABLES_H
17 #define _UAPI_IP6_TABLES_H
18
19 #include <linux/types.h>
20 #include <linux/compiler.h>
21 #include <linux/if.h>
22 #include <linux/netfilter_ipv6.h>
23
24 #include <linux/netfilter/x_tables.h>
25
26 #ifndef __KERNEL__
27 #define IP6T_FUNCTION_MAXNAMELEN XT_FUNCTION_MAXNAMELEN
28 #define IP6T_TABLE_MAXNAMELEN XT_TABLE_MAXNAMELEN
29 #define ip6t_match xt_match
30 #define ip6t_target xt_target
31 #define ip6t_table xt_table
32 #define ip6t_get_revision xt_get_revision
33 #define ip6t_entry_match xt_entry_match
34 #define ip6t_entry_target xt_entry_target
35 #define ip6t_standard_target xt_standard_target
36 #define ip6t_error_target xt_error_target
37 #define ip6t_counters xt_counters
38 #define IP6T_CONTINUE XT_CONTINUE
39 #define IP6T_RETURN XT_RETURN
40
41 /* Pre-iptables-1.4.0 */
42 #include <linux/netfilter/xt_tcpudp.h>
43 #define ip6t_tcp xt_tcp
44 #define ip6t_udp xt_udp
45 #define IP6T_TCP_INV_SRCPT XT_TCP_INV_SRCPT
46 #define IP6T_TCP_INV_DSTPT XT_TCP_INV_DSTPT
47 #define IP6T_TCP_INV_FLAGS XT_TCP_INV_FLAGS
48 #define IP6T_TCP_INV_OPTION XT_TCP_INV_OPTION
49 #define IP6T_TCP_INV_MASK XT_TCP_INV_MASK
50 #define IP6T_UDP_INV_SRCPT XT_UDP_INV_SRCPT
51 #define IP6T_UDP_INV_DSTPT XT_UDP_INV_DSTPT
52 #define IP6T_UDP_INV_MASK XT_UDP_INV_MASK
53
54 #define ip6t_counters_info xt_counters_info
55 #define IP6T_STANDARD_TARGET XT_STANDARD_TARGET
56 #define IP6T_ERROR_TARGET XT_ERROR_TARGET
57 #define IP6T_MATCH_ITERATE(e, fn, args...) \
58 XT_MATCH_ITERATE(struct ip6t_entry, e, fn, ## args)
59 #define IP6T_ENTRY_ITERATE(entries, size, fn, args...) \
60 XT_ENTRY_ITERATE(struct ip6t_entry, entries, size, fn, ## args)
61 #endif
62
63 /* Yes, Virginia, you have to zero the padding. */
64 struct ip6t_ip6 {
65 /* Source and destination IP6 addr */
66 struct in6_addr src, dst;
67 /* Mask for src and dest IP6 addr */
68 struct in6_addr smsk, dmsk;
69 char iniface[IFNAMSIZ], outiface[IFNAMSIZ];
70 unsigned char iniface_mask[IFNAMSIZ], outiface_mask[IFNAMSIZ];
71
72 /* Upper protocol number
73 * - The allowed value is 0 (any) or protocol number of last parsable
74 * header, which is 50 (ESP), 59 (No Next Header), 135 (MH), or
75 * the non IPv6 extension headers.
76 * - The protocol numbers of IPv6 extension headers except of ESP and
77 * MH do not match any packets.
78 * - You also need to set IP6T_FLAGS_PROTO to "flags" to check protocol.
79 */
80 __u16 proto;
81 /* TOS to match iff flags & IP6T_F_TOS */
82 __u8 tos;
83
84 /* Flags word */
85 __u8 flags;
86 /* Inverse flags */
87 __u8 invflags;
88 };
89
90 /* Values for "flag" field in struct ip6t_ip6 (general ip6 structure). */
91 #define IP6T_F_PROTO 0x01 /* Set if rule cares about upper
92 protocols */
93 #define IP6T_F_TOS 0x02 /* Match the TOS. */
94 #define IP6T_F_GOTO 0x04 /* Set if jump is a goto */
95 #define IP6T_F_MASK 0x07 /* All possible flag bits mask. */
96
97 /* Values for "inv" field in struct ip6t_ip6. */
98 #define IP6T_INV_VIA_IN 0x01 /* Invert the sense of IN IFACE. */
99 #define IP6T_INV_VIA_OUT 0x02 /* Invert the sense of OUT IFACE */
100 #define IP6T_INV_TOS 0x04 /* Invert the sense of TOS. */
101 #define IP6T_INV_SRCIP 0x08 /* Invert the sense of SRC IP. */
102 #define IP6T_INV_DSTIP 0x10 /* Invert the sense of DST OP. */
103 #define IP6T_INV_FRAG 0x20 /* Invert the sense of FRAG. */
104 #define IP6T_INV_PROTO XT_INV_PROTO
105 #define IP6T_INV_MASK 0x7F /* All possible flag bits mask. */
106
107 /* This structure defines each of the firewall rules. Consists of 3
108 parts which are 1) general IP header stuff 2) match specific
109 stuff 3) the target to perform if the rule matches */
110 struct ip6t_entry {
111 struct ip6t_ip6 ipv6;
112
113 /* Mark with fields that we care about. */
114 unsigned int nfcache;
115
116 /* Size of ipt_entry + matches */
117 __u16 target_offset;
118 /* Size of ipt_entry + matches + target */
119 __u16 next_offset;
120
121 /* Back pointer */
122 unsigned int comefrom;
123
124 /* Packet and byte counters. */
125 struct xt_counters counters;
126
127 /* The matches (if any), then the target. */
128 unsigned char elems[0];
129 };
130
131 /* Standard entry */
132 struct ip6t_standard {
133 struct ip6t_entry entry;
134 struct xt_standard_target target;
135 };
136
137 struct ip6t_error {
138 struct ip6t_entry entry;
139 struct xt_error_target target;
140 };
141
142 #define IP6T_ENTRY_INIT(__size) \
143 { \
144 .target_offset = sizeof(struct ip6t_entry), \
145 .next_offset = (__size), \
146 }
147
148 #define IP6T_STANDARD_INIT(__verdict) \
149 { \
150 .entry = IP6T_ENTRY_INIT(sizeof(struct ip6t_standard)), \
151 .target = XT_TARGET_INIT(XT_STANDARD_TARGET, \
152 sizeof(struct xt_standard_target)), \
153 .target.verdict = -(__verdict) - 1, \
154 }
155
156 #define IP6T_ERROR_INIT \
157 { \
158 .entry = IP6T_ENTRY_INIT(sizeof(struct ip6t_error)), \
159 .target = XT_TARGET_INIT(XT_ERROR_TARGET, \
160 sizeof(struct xt_error_target)), \
161 .target.errorname = "ERROR", \
162 }
163
164 /*
165 * New IP firewall options for [gs]etsockopt at the RAW IP level.
166 * Unlike BSD Linux inherits IP options so you don't have to use
167 * a raw socket for this. Instead we check rights in the calls.
168 *
169 * ATTENTION: check linux/in6.h before adding new number here.
170 */
171 #define IP6T_BASE_CTL 64
172
173 #define IP6T_SO_SET_REPLACE (IP6T_BASE_CTL)
174 #define IP6T_SO_SET_ADD_COUNTERS (IP6T_BASE_CTL + 1)
175 #define IP6T_SO_SET_MAX IP6T_SO_SET_ADD_COUNTERS
176
177 #define IP6T_SO_GET_INFO (IP6T_BASE_CTL)
178 #define IP6T_SO_GET_ENTRIES (IP6T_BASE_CTL + 1)
179 #define IP6T_SO_GET_REVISION_MATCH (IP6T_BASE_CTL + 4)
180 #define IP6T_SO_GET_REVISION_TARGET (IP6T_BASE_CTL + 5)
181 #define IP6T_SO_GET_MAX IP6T_SO_GET_REVISION_TARGET
182
183 /* obtain original address if REDIRECT'd connection */
184 #define IP6T_SO_ORIGINAL_DST 80
185
186 /* ICMP matching stuff */
187 struct ip6t_icmp {
188 __u8 type; /* type to match */
189 __u8 code[2]; /* range of code */
190 __u8 invflags; /* Inverse flags */
191 };
192
193 /* Values for "inv" field for struct ipt_icmp. */
194 #define IP6T_ICMP_INV 0x01 /* Invert the sense of type/code test */
195
196 /* The argument to IP6T_SO_GET_INFO */
197 struct ip6t_getinfo {
198 /* Which table: caller fills this in. */
199 char name[XT_TABLE_MAXNAMELEN];
200
201 /* Kernel fills these in. */
202 /* Which hook entry points are valid: bitmask */
203 unsigned int valid_hooks;
204
205 /* Hook entry points: one per netfilter hook. */
206 unsigned int hook_entry[NF_INET_NUMHOOKS];
207
208 /* Underflow points. */
209 unsigned int underflow[NF_INET_NUMHOOKS];
210
211 /* Number of entries */
212 unsigned int num_entries;
213
214 /* Size of entries. */
215 unsigned int size;
216 };
217
218 /* The argument to IP6T_SO_SET_REPLACE. */
219 struct ip6t_replace {
220 /* Which table. */
221 char name[XT_TABLE_MAXNAMELEN];
222
223 /* Which hook entry points are valid: bitmask. You can't
224 change this. */
225 unsigned int valid_hooks;
226
227 /* Number of entries */
228 unsigned int num_entries;
229
230 /* Total size of new entries */
231 unsigned int size;
232
233 /* Hook entry points. */
234 unsigned int hook_entry[NF_INET_NUMHOOKS];
235
236 /* Underflow points. */
237 unsigned int underflow[NF_INET_NUMHOOKS];
238
239 /* Information about old entries: */
240 /* Number of counters (must be equal to current number of entries). */
241 unsigned int num_counters;
242 /* The old entries' counters. */
243 struct xt_counters __user *counters;
244
245 /* The entries (hang off end: not really an array). */
246 struct ip6t_entry entries[0];
247 };
248
249 /* The argument to IP6T_SO_GET_ENTRIES. */
250 struct ip6t_get_entries {
251 /* Which table: user fills this in. */
252 char name[XT_TABLE_MAXNAMELEN];
253
254 /* User fills this in: total entry size. */
255 unsigned int size;
256
257 /* The entries. */
258 struct ip6t_entry entrytable[0];
259 };
260
261 /* Helper functions */
262 static __inline__ struct xt_entry_target *
ip6t_get_target(struct ip6t_entry * e)263 ip6t_get_target(struct ip6t_entry *e)
264 {
265 return (struct xt_entry_target *)((char *)e + e->target_offset);
266 }
267
268 /*
269 * Main firewall chains definitions and global var's definitions.
270 */
271
272 #endif /* _UAPI_IP6_TABLES_H */
273