2 * 25-Jul-1998 Major changes to allow for ip chain table
4 * 3-Jan-2000 Named tables to allow packet selection for different uses.
8 * Format of an IP firewall descriptor
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.
22 #include <linux/skbuff.h>
24 #include <linux/types.h>
25 #include <linux/compiler.h>
26 #include <linux/netfilter_ipv4.h>
28 #include <linux/netfilter/x_tables.h>
30 #define IPT_FUNCTION_MAXNAMELEN XT_FUNCTION_MAXNAMELEN
31 #define IPT_TABLE_MAXNAMELEN XT_TABLE_MAXNAMELEN
32 #define ipt_match xt_match
33 #define ipt_target xt_target
34 #define ipt_table xt_table
35 #define ipt_get_revision xt_get_revision
37 /* Yes, Virginia, you have to zero the padding. */
39 /* Source and destination IP addr */
40 struct in_addr src, dst;
41 /* Mask for src and dest IP addr */
42 struct in_addr smsk, dmsk;
43 char iniface[IFNAMSIZ], outiface[IFNAMSIZ];
44 unsigned char iniface_mask[IFNAMSIZ], outiface_mask[IFNAMSIZ];
46 /* Protocol, 0 = ANY */
55 #define ipt_entry_match xt_entry_match
56 #define ipt_entry_target xt_entry_target
57 #define ipt_standard_target xt_standard_target
59 #define ipt_counters xt_counters
61 /* Values for "flag" field in struct ipt_ip (general ip structure). */
62 #define IPT_F_FRAG 0x01 /* Set if rule is a fragment rule */
63 #define IPT_F_GOTO 0x02 /* Set if jump is a goto */
64 #define IPT_F_MASK 0x03 /* All possible flag bits mask. */
66 /* Values for "inv" field in struct ipt_ip. */
67 #define IPT_INV_VIA_IN 0x01 /* Invert the sense of IN IFACE. */
68 #define IPT_INV_VIA_OUT 0x02 /* Invert the sense of OUT IFACE */
69 #define IPT_INV_TOS 0x04 /* Invert the sense of TOS. */
70 #define IPT_INV_SRCIP 0x08 /* Invert the sense of SRC IP. */
71 #define IPT_INV_DSTIP 0x10 /* Invert the sense of DST OP. */
72 #define IPT_INV_FRAG 0x20 /* Invert the sense of FRAG. */
73 #define IPT_INV_PROTO XT_INV_PROTO
74 #define IPT_INV_MASK 0x7F /* All possible flag bits mask. */
76 /* This structure defines each of the firewall rules. Consists of 3
77 parts which are 1) general IP header stuff 2) match specific
78 stuff 3) the target to perform if the rule matches */
82 /* Mark with fields that we care about. */
85 /* Size of ipt_entry + matches */
86 u_int16_t target_offset;
87 /* Size of ipt_entry + matches + target */
88 u_int16_t next_offset;
91 unsigned int comefrom;
93 /* Packet and byte counters. */
94 struct xt_counters counters;
96 /* The matches (if any), then the target. */
97 unsigned char elems[0];
101 * New IP firewall options for [gs]etsockopt at the RAW IP level.
102 * Unlike BSD Linux inherits IP options so you don't have to use a raw
103 * socket for this. Instead we check rights in the calls.
105 * ATTENTION: check linux/in.h before adding new number here.
107 #define IPT_BASE_CTL 64
109 #define IPT_SO_SET_REPLACE (IPT_BASE_CTL)
110 #define IPT_SO_SET_ADD_COUNTERS (IPT_BASE_CTL + 1)
111 #define IPT_SO_SET_MAX IPT_SO_SET_ADD_COUNTERS
113 #define IPT_SO_GET_INFO (IPT_BASE_CTL)
114 #define IPT_SO_GET_ENTRIES (IPT_BASE_CTL + 1)
115 #define IPT_SO_GET_REVISION_MATCH (IPT_BASE_CTL + 2)
116 #define IPT_SO_GET_REVISION_TARGET (IPT_BASE_CTL + 3)
117 #define IPT_SO_GET_MAX IPT_SO_GET_REVISION_TARGET
119 #define IPT_CONTINUE XT_CONTINUE
120 #define IPT_RETURN XT_RETURN
122 #include <linux/netfilter/xt_tcpudp.h>
123 #define ipt_udp xt_udp
124 #define ipt_tcp xt_tcp
126 #define IPT_TCP_INV_SRCPT XT_TCP_INV_SRCPT
127 #define IPT_TCP_INV_DSTPT XT_TCP_INV_DSTPT
128 #define IPT_TCP_INV_FLAGS XT_TCP_INV_FLAGS
129 #define IPT_TCP_INV_OPTION XT_TCP_INV_OPTION
130 #define IPT_TCP_INV_MASK XT_TCP_INV_MASK
132 #define IPT_UDP_INV_SRCPT XT_UDP_INV_SRCPT
133 #define IPT_UDP_INV_DSTPT XT_UDP_INV_DSTPT
134 #define IPT_UDP_INV_MASK XT_UDP_INV_MASK
136 /* ICMP matching stuff */
138 u_int8_t type; /* type to match */
139 u_int8_t code[2]; /* range of code */
140 u_int8_t invflags; /* Inverse flags */
143 /* Values for "inv" field for struct ipt_icmp. */
144 #define IPT_ICMP_INV 0x01 /* Invert the sense of type/code test */
146 /* The argument to IPT_SO_GET_INFO */
148 /* Which table: caller fills this in. */
149 char name[IPT_TABLE_MAXNAMELEN];
151 /* Kernel fills these in. */
152 /* Which hook entry points are valid: bitmask */
153 unsigned int valid_hooks;
155 /* Hook entry points: one per netfilter hook. */
156 unsigned int hook_entry[NF_INET_NUMHOOKS];
158 /* Underflow points. */
159 unsigned int underflow[NF_INET_NUMHOOKS];
161 /* Number of entries */
162 unsigned int num_entries;
164 /* Size of entries. */
168 /* The argument to IPT_SO_SET_REPLACE. */
171 char name[IPT_TABLE_MAXNAMELEN];
173 /* Which hook entry points are valid: bitmask. You can't
175 unsigned int valid_hooks;
177 /* Number of entries */
178 unsigned int num_entries;
180 /* Total size of new entries */
183 /* Hook entry points. */
184 unsigned int hook_entry[NF_INET_NUMHOOKS];
186 /* Underflow points. */
187 unsigned int underflow[NF_INET_NUMHOOKS];
189 /* Information about old entries: */
190 /* Number of counters (must be equal to current number of entries). */
191 unsigned int num_counters;
192 /* The old entries' counters. */
193 struct xt_counters __user *counters;
195 /* The entries (hang off end: not really an array). */
196 struct ipt_entry entries[0];
199 /* The argument to IPT_SO_ADD_COUNTERS. */
200 #define ipt_counters_info xt_counters_info
202 /* The argument to IPT_SO_GET_ENTRIES. */
203 struct ipt_get_entries {
204 /* Which table: user fills this in. */
205 char name[IPT_TABLE_MAXNAMELEN];
207 /* User fills this in: total entry size. */
211 struct ipt_entry entrytable[0];
214 /* Standard return verdict, or do jump. */
215 #define IPT_STANDARD_TARGET XT_STANDARD_TARGET
217 #define IPT_ERROR_TARGET XT_ERROR_TARGET
219 /* Helper functions */
220 static __inline__ struct ipt_entry_target *
221 ipt_get_target(struct ipt_entry *e)
223 return (void *)e + e->target_offset;
226 /* fn returns 0 to continue iteration */
227 #define IPT_MATCH_ITERATE(e, fn, args...) \
228 XT_MATCH_ITERATE(struct ipt_entry, e, fn, ## args)
230 /* fn returns 0 to continue iteration */
231 #define IPT_ENTRY_ITERATE(entries, size, fn, args...) \
232 XT_ENTRY_ITERATE(struct ipt_entry, entries, size, fn, ## args)
235 * Main firewall chains definitions and global var's definitions.
239 #include <linux/init.h>
240 extern void ipt_init(void) __init;
242 extern struct xt_table *ipt_register_table(struct net *net,
243 const struct xt_table *table,
244 const struct ipt_replace *repl);
245 extern void ipt_unregister_table(struct net *net, struct xt_table *table);
247 /* Standard entry. */
248 struct ipt_standard {
249 struct ipt_entry entry;
250 struct ipt_standard_target target;
253 struct ipt_error_target {
254 struct ipt_entry_target target;
255 char errorname[IPT_FUNCTION_MAXNAMELEN];
259 struct ipt_entry entry;
260 struct ipt_error_target target;
263 #define IPT_ENTRY_INIT(__size) \
265 .target_offset = sizeof(struct ipt_entry), \
266 .next_offset = (__size), \
269 #define IPT_STANDARD_INIT(__verdict) \
271 .entry = IPT_ENTRY_INIT(sizeof(struct ipt_standard)), \
272 .target = XT_TARGET_INIT(IPT_STANDARD_TARGET, \
273 sizeof(struct xt_standard_target)), \
274 .target.verdict = -(__verdict) - 1, \
277 #define IPT_ERROR_INIT \
279 .entry = IPT_ENTRY_INIT(sizeof(struct ipt_error)), \
280 .target = XT_TARGET_INIT(IPT_ERROR_TARGET, \
281 sizeof(struct ipt_error_target)), \
282 .target.errorname = "ERROR", \
285 extern unsigned int ipt_do_table(struct sk_buff *skb,
287 const struct net_device *in,
288 const struct net_device *out,
289 struct xt_table *table);
291 #define IPT_ALIGN(s) XT_ALIGN(s)
294 #include <net/compat.h>
296 struct compat_ipt_entry {
298 compat_uint_t nfcache;
299 u_int16_t target_offset;
300 u_int16_t next_offset;
301 compat_uint_t comefrom;
302 struct compat_xt_counters counters;
303 unsigned char elems[0];
306 /* Helper functions */
307 static inline struct ipt_entry_target *
308 compat_ipt_get_target(struct compat_ipt_entry *e)
310 return (void *)e + e->target_offset;
313 #define COMPAT_IPT_ALIGN(s) COMPAT_XT_ALIGN(s)
315 /* fn returns 0 to continue iteration */
316 #define COMPAT_IPT_MATCH_ITERATE(e, fn, args...) \
317 XT_MATCH_ITERATE(struct compat_ipt_entry, e, fn, ## args)
319 /* fn returns 0 to continue iteration */
320 #define COMPAT_IPT_ENTRY_ITERATE(entries, size, fn, args...) \
321 XT_ENTRY_ITERATE(struct compat_ipt_entry, entries, size, fn, ## args)
323 /* fn returns 0 to continue iteration */
324 #define COMPAT_IPT_ENTRY_ITERATE_CONTINUE(entries, size, n, fn, args...) \
325 XT_ENTRY_ITERATE_CONTINUE(struct compat_ipt_entry, entries, size, n, \
328 #endif /* CONFIG_COMPAT */
329 #endif /*__KERNEL__*/
330 #endif /* _IPTABLES_H */