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 IP 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 #ifndef _IPTABLES_H
15 #define _IPTABLES_H
16
17 #include <linux/if.h>
18 #include <linux/in.h>
19 #include <linux/ip.h>
20 #include <linux/skbuff.h>
21
22 #include <linux/init.h>
23 #include <uapi/linux/netfilter_ipv4/ip_tables.h>
24
25 extern void ipt_init(void) __init;
26
27 extern struct xt_table *ipt_register_table(struct net *net,
28 const struct xt_table *table,
29 const struct ipt_replace *repl);
30 extern void ipt_unregister_table(struct net *net, struct xt_table *table);
31
32 /* Standard entry. */
33 struct ipt_standard {
34 struct ipt_entry entry;
35 struct xt_standard_target target;
36 };
37
38 struct ipt_error {
39 struct ipt_entry entry;
40 struct xt_error_target target;
41 };
42
43 #define IPT_ENTRY_INIT(__size) \
44 { \
45 .target_offset = sizeof(struct ipt_entry), \
46 .next_offset = (__size), \
47 }
48
49 #define IPT_STANDARD_INIT(__verdict) \
50 { \
51 .entry = IPT_ENTRY_INIT(sizeof(struct ipt_standard)), \
52 .target = XT_TARGET_INIT(XT_STANDARD_TARGET, \
53 sizeof(struct xt_standard_target)), \
54 .target.verdict = -(__verdict) - 1, \
55 }
56
57 #define IPT_ERROR_INIT \
58 { \
59 .entry = IPT_ENTRY_INIT(sizeof(struct ipt_error)), \
60 .target = XT_TARGET_INIT(XT_ERROR_TARGET, \
61 sizeof(struct xt_error_target)), \
62 .target.errorname = "ERROR", \
63 }
64
65 extern void *ipt_alloc_initial_table(const struct xt_table *);
66 extern unsigned int ipt_do_table(struct sk_buff *skb,
67 unsigned int hook,
68 const struct net_device *in,
69 const struct net_device *out,
70 struct xt_table *table);
71
72 #ifdef CONFIG_COMPAT
73 #include <net/compat.h>
74
75 struct compat_ipt_entry {
76 struct ipt_ip ip;
77 compat_uint_t nfcache;
78 __u16 target_offset;
79 __u16 next_offset;
80 compat_uint_t comefrom;
81 struct compat_xt_counters counters;
82 unsigned char elems[0];
83 };
84
85 /* Helper functions */
86 static inline struct xt_entry_target *
87 compat_ipt_get_target(struct compat_ipt_entry *e)
88 {
89 return (void *)e + e->target_offset;
90 }
91
92 #endif /* CONFIG_COMPAT */
93 #endif /* _IPTABLES_H */
94
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