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 IP6 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 _IP6_TABLES_H
16 #define _IP6_TABLES_H
17
18 #include <linux/types.h>
19
20 #include <linux/netfilter_ipv6.h>
21
22 #include <linux/netfilter/x_tables.h>
23
24 #define IP6T_FUNCTION_MAXNAMELEN XT_FUNCTION_MAXNAMELEN
25 #define IP6T_TABLE_MAXNAMELEN XT_TABLE_MAXNAMELEN
26 #define ip6t_match xt_match
27 #define ip6t_target xt_target
28 #define ip6t_table xt_table
29 #define ip6t_get_revision xt_get_revision
30 #define ip6t_entry_match xt_entry_match
31 #define ip6t_entry_target xt_entry_target
32 #define ip6t_standard_target xt_standard_target
33 #define ip6t_error_target xt_error_target
34 #define ip6t_counters xt_counters
35 #define IP6T_CONTINUE XT_CONTINUE
36 #define IP6T_RETURN XT_RETURN
37
38 /* Pre-iptables-1.4.0 */
39 #include <linux/netfilter/xt_tcpudp.h>
40 #define ip6t_tcp xt_tcp
41 #define ip6t_udp xt_udp
42 #define IP6T_TCP_INV_SRCPT XT_TCP_INV_SRCPT
43 #define IP6T_TCP_INV_DSTPT XT_TCP_INV_DSTPT
44 #define IP6T_TCP_INV_FLAGS XT_TCP_INV_FLAGS
45 #define IP6T_TCP_INV_OPTION XT_TCP_INV_OPTION
46 #define IP6T_TCP_INV_MASK XT_TCP_INV_MASK
47 #define IP6T_UDP_INV_SRCPT XT_UDP_INV_SRCPT
48 #define IP6T_UDP_INV_DSTPT XT_UDP_INV_DSTPT
49 #define IP6T_UDP_INV_MASK XT_UDP_INV_MASK
50
51 #define ip6t_counters_info xt_counters_info
52 #define IP6T_STANDARD_TARGET XT_STANDARD_TARGET
53 #define IP6T_ERROR_TARGET XT_ERROR_TARGET
54 #define IP6T_MATCH_ITERATE(e, fn, args...) \
55 XT_MATCH_ITERATE(struct ip6t_entry, e, fn, ## args)
56 #define IP6T_ENTRY_ITERATE(entries, size, fn, args...) \
57 XT_ENTRY_ITERATE(struct ip6t_entry, entries, size, fn, ## args)
58
59 /* Yes, Virginia, you have to zero the padding. */
60 struct ip6t_ip6 {
61 /* Source and destination IP6 addr */
62 struct in6_addr src, dst;
63 /* Mask for src and dest IP6 addr */
64 struct in6_addr smsk, dmsk;
65 char iniface[IFNAMSIZ], outiface[IFNAMSIZ];
66 unsigned char iniface_mask[IFNAMSIZ], outiface_mask[IFNAMSIZ];
67
68 /* Upper protocol number
69 * - The allowed value is 0 (any) or protocol number of last parsable
70 * header, which is 50 (ESP), 59 (No Next Header), 135 (MH), or
71 * the non IPv6 extension headers.
72 * - The protocol numbers of IPv6 extension headers except of ESP and
73 * MH do not match any packets.
74 * - You also need to set IP6T_FLAGS_PROTO to "flags" to check protocol.
75 */
76 __u16 proto;
77 /* TOS to match iff flags & IP6T_F_TOS */
78 __u8 tos;
79
80 /* Flags word */
81 __u8 flags;
82 /* Inverse flags */
83 __u8 invflags;
84 };
85
86 /* Values for "flag" field in struct ip6t_ip6 (general ip6 structure). */
87 #define IP6T_F_PROTO 0x01 /* Set if rule cares about upper
88 protocols */
89 #define IP6T_F_TOS 0x02 /* Match the TOS. */
90 #define IP6T_F_GOTO 0x04 /* Set if jump is a goto */
91 #define IP6T_F_MASK 0x07 /* All possible flag bits mask. */
92
93 /* Values for "inv" field in struct ip6t_ip6. */
94 #define IP6T_INV_VIA_IN 0x01 /* Invert the sense of IN IFACE. */
95 #define IP6T_INV_VIA_OUT 0x02 /* Invert the sense of OUT IFACE */
96 #define IP6T_INV_TOS 0x04 /* Invert the sense of TOS. */
97 #define IP6T_INV_SRCIP 0x08 /* Invert the sense of SRC IP. */
98 #define IP6T_INV_DSTIP 0x10 /* Invert the sense of DST OP. */
99 #define IP6T_INV_FRAG 0x20 /* Invert the sense of FRAG. */
100 #define IP6T_INV_PROTO XT_INV_PROTO
101 #define IP6T_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 ip6t_entry {
107 struct ip6t_ip6 ipv6;
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[0];
125 };
126
127 /* Standard entry */
128 struct ip6t_standard {
129 struct ip6t_entry entry;
130 struct xt_standard_target target;
131 };
132
133 struct ip6t_error {
134 struct ip6t_entry entry;
135 struct xt_error_target target;
136 };
137
138 #define IP6T_ENTRY_INIT(__size) \
139 { \
140 .target_offset = sizeof(struct ip6t_entry), \
141 .next_offset = (__size), \
142 }
143
144 #define IP6T_STANDARD_INIT(__verdict) \
145 { \
146 .entry = IP6T_ENTRY_INIT(sizeof(struct ip6t_standard)), \
147 .target = XT_TARGET_INIT(XT_STANDARD_TARGET, \
148 sizeof(struct xt_standard_target)), \
149 .target.verdict = -(__verdict) - 1, \
150 }
151
152 #define IP6T_ERROR_INIT \
153 { \
154 .entry = IP6T_ENTRY_INIT(sizeof(struct ip6t_error)), \
155 .target = XT_TARGET_INIT(XT_ERROR_TARGET, \
156 sizeof(struct xt_error_target)), \
157 .target.errorname = "ERROR", \
158 }
159
160 /*
161 * New IP firewall options for [gs]etsockopt at the RAW IP level.
162 * Unlike BSD Linux inherits IP options so you don't have to use
163 * a raw socket for this. Instead we check rights in the calls.
164 *
165 * ATTENTION: check linux/in6.h before adding new number here.
166 */
167 #define IP6T_BASE_CTL 64
168
169 #define IP6T_SO_SET_REPLACE (IP6T_BASE_CTL)
170 #define IP6T_SO_SET_ADD_COUNTERS (IP6T_BASE_CTL + 1)
171 #define IP6T_SO_SET_MAX IP6T_SO_SET_ADD_COUNTERS
172
173 #define IP6T_SO_GET_INFO (IP6T_BASE_CTL)
174 #define IP6T_SO_GET_ENTRIES (IP6T_BASE_CTL + 1)
175 #define IP6T_SO_GET_REVISION_MATCH (IP6T_BASE_CTL + 4)
176 #define IP6T_SO_GET_REVISION_TARGET (IP6T_BASE_CTL + 5)
177 #define IP6T_SO_GET_MAX IP6T_SO_GET_REVISION_TARGET
178
179 /* obtain original address if REDIRECT'd connection */
180 #define IP6T_SO_ORIGINAL_DST 80
181
182 /* ICMP matching stuff */
183 struct ip6t_icmp {
184 __u8 type; /* type to match */
185 __u8 code[2]; /* range of code */
186 __u8 invflags; /* Inverse flags */
187 };
188
189 /* Values for "inv" field for struct ipt_icmp. */
190 #define IP6T_ICMP_INV 0x01 /* Invert the sense of type/code test */
191
192 /* The argument to IP6T_SO_GET_INFO */
193 struct ip6t_getinfo {
194 /* Which table: caller fills this in. */
195 char name[XT_TABLE_MAXNAMELEN];
196
197 /* Kernel fills these in. */
198 /* Which hook entry points are valid: bitmask */
199 unsigned int valid_hooks;
200
201 /* Hook entry points: one per netfilter hook. */
202 unsigned int hook_entry[NF_INET_NUMHOOKS];
203
204 /* Underflow points. */
205 unsigned int underflow[NF_INET_NUMHOOKS];
206
207 /* Number of entries */
208 unsigned int num_entries;
209
210 /* Size of entries. */
211 unsigned int size;
212 };
213
214 /* The argument to IP6T_SO_SET_REPLACE. */
215 struct ip6t_replace {
216 /* Which table. */
217 char name[XT_TABLE_MAXNAMELEN];
218
219 /* Which hook entry points are valid: bitmask. You can't
220 change this. */
221 unsigned int valid_hooks;
222
223 /* Number of entries */
224 unsigned int num_entries;
225
226 /* Total size of new entries */
227 unsigned int size;
228
229 /* Hook entry points. */
230 unsigned int hook_entry[NF_INET_NUMHOOKS];
231
232 /* Underflow points. */
233 unsigned int underflow[NF_INET_NUMHOOKS];
234
235 /* Information about old entries: */
236 /* Number of counters (must be equal to current number of entries). */
237 unsigned int num_counters;
238 /* The old entries' counters. */
239 struct xt_counters *counters;
240
241 /* The entries (hang off end: not really an array). */
242 struct ip6t_entry entries[0];
243 };
244
245 /* The argument to IP6T_SO_GET_ENTRIES. */
246 struct ip6t_get_entries {
247 /* Which table: user fills this in. */
248 char name[XT_TABLE_MAXNAMELEN];
249
250 /* User fills this in: total entry size. */
251 unsigned int size;
252
253 /* The entries. */
254 struct ip6t_entry entrytable[0];
255 };
256
257 /* Helper functions */
258 static __inline__ struct xt_entry_target *
ip6t_get_target(struct ip6t_entry * e)259 ip6t_get_target(struct ip6t_entry *e)
260 {
261 return (void *)e + e->target_offset;
262 }
263
264 /*
265 * Main firewall chains definitions and global var's definitions.
266 */
267
268 #endif /* _IP6_TABLES_H */
269