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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 * |
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 |
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