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);
28
29 void ipt_unregister_table_pre_exit(struct net *net, const char *name);
30 void ipt_unregister_table_exit(struct net *net, const char *name);
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(void *priv,
67 struct sk_buff *skb,
68 const struct nf_hook_state *state);
69
70 #ifdef CONFIG_NETFILTER_XTABLES_COMPAT
71 #include <net/compat.h>
72
73 struct compat_ipt_entry {
74 struct ipt_ip ip;
75 compat_uint_t nfcache;
76 __u16 target_offset;
77 __u16 next_offset;
78 compat_uint_t comefrom;
79 struct compat_xt_counters counters;
80 unsigned char elems[];
81 };
82
83 /* Helper functions */
84 static inline struct xt_entry_target *
compat_ipt_get_target(struct compat_ipt_entry * e)85 compat_ipt_get_target(struct compat_ipt_entry *e)
86 {
87 return (void *)e + e->target_offset;
88 }
89
90 #endif /* CONFIG_COMPAT */
91 #endif /* _IPTABLES_H */
92
