Commit | Line | Data |
---|---|---|
1da177e4 LT |
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 | #ifdef __KERNEL__ | |
19 | #include <linux/if.h> | |
1da177e4 LT |
20 | #include <linux/in6.h> |
21 | #include <linux/ipv6.h> | |
22 | #include <linux/skbuff.h> | |
23 | #endif | |
c8942f1f | 24 | #include <linux/types.h> |
1da177e4 LT |
25 | #include <linux/compiler.h> |
26 | #include <linux/netfilter_ipv6.h> | |
27 | ||
2e4e6a17 HW |
28 | #include <linux/netfilter/x_tables.h> |
29 | ||
12b00c2c | 30 | #ifndef __KERNEL__ |
2e4e6a17 HW |
31 | #define IP6T_FUNCTION_MAXNAMELEN XT_FUNCTION_MAXNAMELEN |
32 | #define IP6T_TABLE_MAXNAMELEN XT_TABLE_MAXNAMELEN | |
2e4e6a17 HW |
33 | #define ip6t_match xt_match |
34 | #define ip6t_target xt_target | |
35 | #define ip6t_table xt_table | |
36 | #define ip6t_get_revision xt_get_revision | |
87a2e70d JE |
37 | #define ip6t_entry_match xt_entry_match |
38 | #define ip6t_entry_target xt_entry_target | |
39 | #define ip6t_standard_target xt_standard_target | |
75f0a0fd | 40 | #define ip6t_error_target xt_error_target |
87a2e70d | 41 | #define ip6t_counters xt_counters |
243bf6e2 JE |
42 | #define IP6T_CONTINUE XT_CONTINUE |
43 | #define IP6T_RETURN XT_RETURN | |
44 | ||
45 | /* Pre-iptables-1.4.0 */ | |
46 | #include <linux/netfilter/xt_tcpudp.h> | |
47 | #define ip6t_tcp xt_tcp | |
48 | #define ip6t_udp xt_udp | |
49 | #define IP6T_TCP_INV_SRCPT XT_TCP_INV_SRCPT | |
50 | #define IP6T_TCP_INV_DSTPT XT_TCP_INV_DSTPT | |
51 | #define IP6T_TCP_INV_FLAGS XT_TCP_INV_FLAGS | |
52 | #define IP6T_TCP_INV_OPTION XT_TCP_INV_OPTION | |
53 | #define IP6T_TCP_INV_MASK XT_TCP_INV_MASK | |
54 | #define IP6T_UDP_INV_SRCPT XT_UDP_INV_SRCPT | |
55 | #define IP6T_UDP_INV_DSTPT XT_UDP_INV_DSTPT | |
56 | #define IP6T_UDP_INV_MASK XT_UDP_INV_MASK | |
57 | ||
58 | #define ip6t_counters_info xt_counters_info | |
59 | #define IP6T_STANDARD_TARGET XT_STANDARD_TARGET | |
60 | #define IP6T_ERROR_TARGET XT_ERROR_TARGET | |
61 | #define IP6T_MATCH_ITERATE(e, fn, args...) \ | |
62 | XT_MATCH_ITERATE(struct ip6t_entry, e, fn, ## args) | |
63 | #define IP6T_ENTRY_ITERATE(entries, size, fn, args...) \ | |
64 | XT_ENTRY_ITERATE(struct ip6t_entry, entries, size, fn, ## args) | |
12b00c2c | 65 | #endif |
1da177e4 LT |
66 | |
67 | /* Yes, Virginia, you have to zero the padding. */ | |
68 | struct ip6t_ip6 { | |
69 | /* Source and destination IP6 addr */ | |
70 | struct in6_addr src, dst; | |
71 | /* Mask for src and dest IP6 addr */ | |
72 | struct in6_addr smsk, dmsk; | |
73 | char iniface[IFNAMSIZ], outiface[IFNAMSIZ]; | |
74 | unsigned char iniface_mask[IFNAMSIZ], outiface_mask[IFNAMSIZ]; | |
75 | ||
7bfe2461 YK |
76 | /* Upper protocol number |
77 | * - The allowed value is 0 (any) or protocol number of last parsable | |
78 | * header, which is 50 (ESP), 59 (No Next Header), 135 (MH), or | |
79 | * the non IPv6 extension headers. | |
80 | * - The protocol numbers of IPv6 extension headers except of ESP and | |
81 | * MH do not match any packets. | |
82 | * - You also need to set IP6T_FLAGS_PROTO to "flags" to check protocol. | |
83 | */ | |
7ff30c43 | 84 | __u16 proto; |
1da177e4 | 85 | /* TOS to match iff flags & IP6T_F_TOS */ |
7ff30c43 | 86 | __u8 tos; |
1da177e4 LT |
87 | |
88 | /* Flags word */ | |
7ff30c43 | 89 | __u8 flags; |
1da177e4 | 90 | /* Inverse flags */ |
7ff30c43 | 91 | __u8 invflags; |
1da177e4 LT |
92 | }; |
93 | ||
1da177e4 LT |
94 | /* Values for "flag" field in struct ip6t_ip6 (general ip6 structure). */ |
95 | #define IP6T_F_PROTO 0x01 /* Set if rule cares about upper | |
96 | protocols */ | |
97 | #define IP6T_F_TOS 0x02 /* Match the TOS. */ | |
05465343 PM |
98 | #define IP6T_F_GOTO 0x04 /* Set if jump is a goto */ |
99 | #define IP6T_F_MASK 0x07 /* All possible flag bits mask. */ | |
1da177e4 LT |
100 | |
101 | /* Values for "inv" field in struct ip6t_ip6. */ | |
102 | #define IP6T_INV_VIA_IN 0x01 /* Invert the sense of IN IFACE. */ | |
103 | #define IP6T_INV_VIA_OUT 0x02 /* Invert the sense of OUT IFACE */ | |
104 | #define IP6T_INV_TOS 0x04 /* Invert the sense of TOS. */ | |
105 | #define IP6T_INV_SRCIP 0x08 /* Invert the sense of SRC IP. */ | |
106 | #define IP6T_INV_DSTIP 0x10 /* Invert the sense of DST OP. */ | |
107 | #define IP6T_INV_FRAG 0x20 /* Invert the sense of FRAG. */ | |
2e4e6a17 | 108 | #define IP6T_INV_PROTO XT_INV_PROTO |
1da177e4 LT |
109 | #define IP6T_INV_MASK 0x7F /* All possible flag bits mask. */ |
110 | ||
111 | /* This structure defines each of the firewall rules. Consists of 3 | |
112 | parts which are 1) general IP header stuff 2) match specific | |
113 | stuff 3) the target to perform if the rule matches */ | |
d94d9fee | 114 | struct ip6t_entry { |
1da177e4 LT |
115 | struct ip6t_ip6 ipv6; |
116 | ||
117 | /* Mark with fields that we care about. */ | |
118 | unsigned int nfcache; | |
119 | ||
120 | /* Size of ipt_entry + matches */ | |
7ff30c43 | 121 | __u16 target_offset; |
1da177e4 | 122 | /* Size of ipt_entry + matches + target */ |
7ff30c43 | 123 | __u16 next_offset; |
1da177e4 LT |
124 | |
125 | /* Back pointer */ | |
126 | unsigned int comefrom; | |
127 | ||
128 | /* Packet and byte counters. */ | |
2e4e6a17 | 129 | struct xt_counters counters; |
1da177e4 LT |
130 | |
131 | /* The matches (if any), then the target. */ | |
132 | unsigned char elems[0]; | |
133 | }; | |
134 | ||
9934e81c | 135 | /* Standard entry */ |
d94d9fee | 136 | struct ip6t_standard { |
9934e81c | 137 | struct ip6t_entry entry; |
87a2e70d | 138 | struct xt_standard_target target; |
9934e81c PM |
139 | }; |
140 | ||
d94d9fee | 141 | struct ip6t_error { |
9934e81c | 142 | struct ip6t_entry entry; |
75f0a0fd | 143 | struct xt_error_target target; |
9934e81c PM |
144 | }; |
145 | ||
3c2ad469 PM |
146 | #define IP6T_ENTRY_INIT(__size) \ |
147 | { \ | |
148 | .target_offset = sizeof(struct ip6t_entry), \ | |
149 | .next_offset = (__size), \ | |
150 | } | |
151 | ||
152 | #define IP6T_STANDARD_INIT(__verdict) \ | |
153 | { \ | |
154 | .entry = IP6T_ENTRY_INIT(sizeof(struct ip6t_standard)), \ | |
243bf6e2 | 155 | .target = XT_TARGET_INIT(XT_STANDARD_TARGET, \ |
87a2e70d | 156 | sizeof(struct xt_standard_target)), \ |
3c2ad469 PM |
157 | .target.verdict = -(__verdict) - 1, \ |
158 | } | |
159 | ||
160 | #define IP6T_ERROR_INIT \ | |
161 | { \ | |
162 | .entry = IP6T_ENTRY_INIT(sizeof(struct ip6t_error)), \ | |
243bf6e2 | 163 | .target = XT_TARGET_INIT(XT_ERROR_TARGET, \ |
75f0a0fd | 164 | sizeof(struct xt_error_target)), \ |
3c2ad469 PM |
165 | .target.errorname = "ERROR", \ |
166 | } | |
167 | ||
1da177e4 LT |
168 | /* |
169 | * New IP firewall options for [gs]etsockopt at the RAW IP level. | |
170 | * Unlike BSD Linux inherits IP options so you don't have to use | |
b96e7ecb YK |
171 | * a raw socket for this. Instead we check rights in the calls. |
172 | * | |
173 | * ATTENTION: check linux/in6.h before adding new number here. | |
174 | */ | |
175 | #define IP6T_BASE_CTL 64 | |
176 | ||
177 | #define IP6T_SO_SET_REPLACE (IP6T_BASE_CTL) | |
178 | #define IP6T_SO_SET_ADD_COUNTERS (IP6T_BASE_CTL + 1) | |
179 | #define IP6T_SO_SET_MAX IP6T_SO_SET_ADD_COUNTERS | |
180 | ||
181 | #define IP6T_SO_GET_INFO (IP6T_BASE_CTL) | |
182 | #define IP6T_SO_GET_ENTRIES (IP6T_BASE_CTL + 1) | |
183 | #define IP6T_SO_GET_REVISION_MATCH (IP6T_BASE_CTL + 4) | |
184 | #define IP6T_SO_GET_REVISION_TARGET (IP6T_BASE_CTL + 5) | |
185 | #define IP6T_SO_GET_MAX IP6T_SO_GET_REVISION_TARGET | |
1da177e4 | 186 | |
1da177e4 | 187 | /* ICMP matching stuff */ |
d94d9fee | 188 | struct ip6t_icmp { |
7ff30c43 BH |
189 | __u8 type; /* type to match */ |
190 | __u8 code[2]; /* range of code */ | |
191 | __u8 invflags; /* Inverse flags */ | |
1da177e4 LT |
192 | }; |
193 | ||
194 | /* Values for "inv" field for struct ipt_icmp. */ | |
195 | #define IP6T_ICMP_INV 0x01 /* Invert the sense of type/code test */ | |
196 | ||
197 | /* The argument to IP6T_SO_GET_INFO */ | |
d94d9fee | 198 | struct ip6t_getinfo { |
1da177e4 | 199 | /* Which table: caller fills this in. */ |
12b00c2c | 200 | char name[XT_TABLE_MAXNAMELEN]; |
1da177e4 LT |
201 | |
202 | /* Kernel fills these in. */ | |
203 | /* Which hook entry points are valid: bitmask */ | |
204 | unsigned int valid_hooks; | |
205 | ||
206 | /* Hook entry points: one per netfilter hook. */ | |
6e23ae2a | 207 | unsigned int hook_entry[NF_INET_NUMHOOKS]; |
1da177e4 LT |
208 | |
209 | /* Underflow points. */ | |
6e23ae2a | 210 | unsigned int underflow[NF_INET_NUMHOOKS]; |
1da177e4 LT |
211 | |
212 | /* Number of entries */ | |
213 | unsigned int num_entries; | |
214 | ||
215 | /* Size of entries. */ | |
216 | unsigned int size; | |
217 | }; | |
218 | ||
219 | /* The argument to IP6T_SO_SET_REPLACE. */ | |
d94d9fee | 220 | struct ip6t_replace { |
1da177e4 | 221 | /* Which table. */ |
12b00c2c | 222 | char name[XT_TABLE_MAXNAMELEN]; |
1da177e4 LT |
223 | |
224 | /* Which hook entry points are valid: bitmask. You can't | |
225 | change this. */ | |
226 | unsigned int valid_hooks; | |
227 | ||
228 | /* Number of entries */ | |
229 | unsigned int num_entries; | |
230 | ||
231 | /* Total size of new entries */ | |
232 | unsigned int size; | |
233 | ||
234 | /* Hook entry points. */ | |
6e23ae2a | 235 | unsigned int hook_entry[NF_INET_NUMHOOKS]; |
1da177e4 LT |
236 | |
237 | /* Underflow points. */ | |
6e23ae2a | 238 | unsigned int underflow[NF_INET_NUMHOOKS]; |
1da177e4 LT |
239 | |
240 | /* Information about old entries: */ | |
241 | /* Number of counters (must be equal to current number of entries). */ | |
242 | unsigned int num_counters; | |
243 | /* The old entries' counters. */ | |
2e4e6a17 | 244 | struct xt_counters __user *counters; |
1da177e4 LT |
245 | |
246 | /* The entries (hang off end: not really an array). */ | |
247 | struct ip6t_entry entries[0]; | |
248 | }; | |
249 | ||
1da177e4 | 250 | /* The argument to IP6T_SO_GET_ENTRIES. */ |
d94d9fee | 251 | struct ip6t_get_entries { |
1da177e4 | 252 | /* Which table: user fills this in. */ |
12b00c2c | 253 | char name[XT_TABLE_MAXNAMELEN]; |
1da177e4 LT |
254 | |
255 | /* User fills this in: total entry size. */ | |
256 | unsigned int size; | |
257 | ||
258 | /* The entries. */ | |
259 | struct ip6t_entry entrytable[0]; | |
260 | }; | |
261 | ||
1da177e4 | 262 | /* Helper functions */ |
87a2e70d | 263 | static __inline__ struct xt_entry_target * |
1da177e4 LT |
264 | ip6t_get_target(struct ip6t_entry *e) |
265 | { | |
266 | return (void *)e + e->target_offset; | |
267 | } | |
268 | ||
1da177e4 LT |
269 | /* |
270 | * Main firewall chains definitions and global var's definitions. | |
271 | */ | |
272 | ||
273 | #ifdef __KERNEL__ | |
274 | ||
275 | #include <linux/init.h> | |
276 | extern void ip6t_init(void) __init; | |
277 | ||
e3eaa991 | 278 | extern void *ip6t_alloc_initial_table(const struct xt_table *); |
336b517f | 279 | extern struct xt_table *ip6t_register_table(struct net *net, |
35aad0ff | 280 | const struct xt_table *table, |
44d34e72 | 281 | const struct ip6t_replace *repl); |
f54e9367 | 282 | extern void ip6t_unregister_table(struct net *net, struct xt_table *table); |
3db05fea | 283 | extern unsigned int ip6t_do_table(struct sk_buff *skb, |
1da177e4 LT |
284 | unsigned int hook, |
285 | const struct net_device *in, | |
286 | const struct net_device *out, | |
e60a13e0 | 287 | struct xt_table *table); |
1da177e4 LT |
288 | |
289 | /* Check for an extension */ | |
95ad2f87 PNA |
290 | static inline int |
291 | ip6t_ext_hdr(u8 nexthdr) | |
292 | { return (nexthdr == IPPROTO_HOPOPTS) || | |
293 | (nexthdr == IPPROTO_ROUTING) || | |
294 | (nexthdr == IPPROTO_FRAGMENT) || | |
295 | (nexthdr == IPPROTO_ESP) || | |
296 | (nexthdr == IPPROTO_AH) || | |
297 | (nexthdr == IPPROTO_NONE) || | |
298 | (nexthdr == IPPROTO_DSTOPTS); | |
299 | } | |
300 | ||
84018f55 HS |
301 | enum { |
302 | IP6T_FH_F_FRAG = (1 << 0), | |
303 | IP6T_FH_F_AUTH = (1 << 1), | |
304 | }; | |
305 | ||
e674d0f3 YK |
306 | /* find specified header and get offset to it */ |
307 | extern int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, | |
84018f55 | 308 | int target, unsigned short *fragoff, int *fragflg); |
1da177e4 | 309 | |
3bc3fe5e PM |
310 | #ifdef CONFIG_COMPAT |
311 | #include <net/compat.h> | |
312 | ||
d94d9fee | 313 | struct compat_ip6t_entry { |
3bc3fe5e PM |
314 | struct ip6t_ip6 ipv6; |
315 | compat_uint_t nfcache; | |
7ff30c43 BH |
316 | __u16 target_offset; |
317 | __u16 next_offset; | |
3bc3fe5e PM |
318 | compat_uint_t comefrom; |
319 | struct compat_xt_counters counters; | |
320 | unsigned char elems[0]; | |
321 | }; | |
322 | ||
87a2e70d | 323 | static inline struct xt_entry_target * |
3bc3fe5e PM |
324 | compat_ip6t_get_target(struct compat_ip6t_entry *e) |
325 | { | |
326 | return (void *)e + e->target_offset; | |
327 | } | |
328 | ||
3bc3fe5e | 329 | #endif /* CONFIG_COMPAT */ |
1da177e4 LT |
330 | #endif /*__KERNEL__*/ |
331 | #endif /* _IP6_TABLES_H */ |