1 /* SPDX-License-Identifier: GPL-2.0 */
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 IP 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 #ifndef _IPTABLES_H
16 #define _IPTABLES_H
17
18 #include <linux/if.h>
19 #include <linux/in.h>
20 #include <linux/init.h>
21 #include <linux/ip.h>
22 #include <linux/skbuff.h>
23 #include <uapi/linux/netfilter_ipv4/ip_tables.h>
24
25 int ipt_register_table(struct net *net, const struct xt_table *table,
26 const struct ipt_replace *repl,
27 const struct nf_hook_ops *ops, struct xt_table **res);
28
29 void ipt_unregister_table_pre_exit(struct net *net, struct xt_table *table,
30 const struct nf_hook_ops *ops);
31
32 void ipt_unregister_table_exit(struct net *net, struct xt_table *table);
33
34 void ipt_unregister_table(struct net *net, struct xt_table *table,
35 const struct nf_hook_ops *ops);
36
37 /* Standard entry. */
38 struct ipt_standard {
39 struct ipt_entry entry;
40 struct xt_standard_target target;
41 };
42
43 struct ipt_error {
44 struct ipt_entry entry;
45 struct xt_error_target target;
46 };
47
48 #define IPT_ENTRY_INIT(__size) \
49 { \
50 .target_offset = sizeof(struct ipt_entry), \
51 .next_offset = (__size), \
52 }
53
54 #define IPT_STANDARD_INIT(__verdict) \
55 { \
56 .entry = IPT_ENTRY_INIT(sizeof(struct ipt_standard)), \
57 .target = XT_TARGET_INIT(XT_STANDARD_TARGET, \
58 sizeof(struct xt_standard_target)), \
59 .target.verdict = -(__verdict) - 1, \
60 }
61
62 #define IPT_ERROR_INIT \
63 { \
64 .entry = IPT_ENTRY_INIT(sizeof(struct ipt_error)), \
65 .target = XT_TARGET_INIT(XT_ERROR_TARGET, \
66 sizeof(struct xt_error_target)), \
67 .target.errorname = "ERROR", \
68 }
69
70 extern void *ipt_alloc_initial_table(const struct xt_table *);
71 extern unsigned int ipt_do_table(struct sk_buff *skb,
72 const struct nf_hook_state *state,
73 struct xt_table *table);
74
75 #ifdef CONFIG_COMPAT
76 #include <net/compat.h>
77
78 struct compat_ipt_entry {
79 struct ipt_ip ip;
80 compat_uint_t nfcache;
81 __u16 target_offset;
82 __u16 next_offset;
83 compat_uint_t comefrom;
84 struct compat_xt_counters counters;
85 unsigned char elems[];
86 };
87
88 /* Helper functions */
89 static inline struct xt_entry_target *
90 compat_ipt_get_target(struct compat_ipt_entry *e)
91 {
92 return (void *)e + e->target_offset;
93 }
94
95 #endif /* CONFIG_COMPAT */
96 #endif /* _IPTABLES_H */
97
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