]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * 'raw' table, which is the very first hooked in at PRE_ROUTING and LOCAL_OUT . | |
3 | * | |
4 | * Copyright (C) 2003 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> | |
5 | */ | |
6 | #include <linux/module.h> | |
7 | #include <linux/netfilter_ipv4/ip_tables.h> | |
8 | ||
9 | #define RAW_VALID_HOOKS ((1 << NF_IP_PRE_ROUTING) | (1 << NF_IP_LOCAL_OUT)) | |
10 | ||
11 | static struct | |
12 | { | |
13 | struct ipt_replace repl; | |
14 | struct ipt_standard entries[2]; | |
15 | struct ipt_error term; | |
16 | } initial_table __initdata = { | |
17 | .repl = { | |
18 | .name = "raw", | |
19 | .valid_hooks = RAW_VALID_HOOKS, | |
20 | .num_entries = 3, | |
21 | .size = sizeof(struct ipt_standard) * 2 + sizeof(struct ipt_error), | |
22 | .hook_entry = { | |
23 | [NF_IP_PRE_ROUTING] = 0, | |
24 | [NF_IP_LOCAL_OUT] = sizeof(struct ipt_standard) }, | |
25 | .underflow = { | |
26 | [NF_IP_PRE_ROUTING] = 0, | |
27 | [NF_IP_LOCAL_OUT] = sizeof(struct ipt_standard) }, | |
28 | }, | |
29 | .entries = { | |
30 | /* PRE_ROUTING */ | |
31 | { | |
32 | .entry = { | |
33 | .target_offset = sizeof(struct ipt_entry), | |
34 | .next_offset = sizeof(struct ipt_standard), | |
35 | }, | |
36 | .target = { | |
37 | .target = { | |
38 | .u = { | |
39 | .target_size = IPT_ALIGN(sizeof(struct ipt_standard_target)), | |
40 | }, | |
41 | }, | |
42 | .verdict = -NF_ACCEPT - 1, | |
43 | }, | |
44 | }, | |
45 | ||
46 | /* LOCAL_OUT */ | |
47 | { | |
48 | .entry = { | |
49 | .target_offset = sizeof(struct ipt_entry), | |
50 | .next_offset = sizeof(struct ipt_standard), | |
51 | }, | |
52 | .target = { | |
53 | .target = { | |
54 | .u = { | |
55 | .target_size = IPT_ALIGN(sizeof(struct ipt_standard_target)), | |
56 | }, | |
57 | }, | |
58 | .verdict = -NF_ACCEPT - 1, | |
59 | }, | |
60 | }, | |
61 | }, | |
62 | /* ERROR */ | |
63 | .term = { | |
64 | .entry = { | |
65 | .target_offset = sizeof(struct ipt_entry), | |
66 | .next_offset = sizeof(struct ipt_error), | |
67 | }, | |
68 | .target = { | |
69 | .target = { | |
70 | .u = { | |
71 | .user = { | |
72 | .target_size = IPT_ALIGN(sizeof(struct ipt_error_target)), | |
73 | .name = IPT_ERROR_TARGET, | |
74 | }, | |
75 | }, | |
76 | }, | |
77 | .errorname = "ERROR", | |
78 | }, | |
79 | } | |
80 | }; | |
81 | ||
82 | static struct ipt_table packet_raw = { | |
83 | .name = "raw", | |
84 | .valid_hooks = RAW_VALID_HOOKS, | |
85 | .lock = RW_LOCK_UNLOCKED, | |
86 | .me = THIS_MODULE | |
87 | }; | |
88 | ||
89 | /* The work comes in here from netfilter.c. */ | |
90 | static unsigned int | |
91 | ipt_hook(unsigned int hook, | |
92 | struct sk_buff **pskb, | |
93 | const struct net_device *in, | |
94 | const struct net_device *out, | |
95 | int (*okfn)(struct sk_buff *)) | |
96 | { | |
97 | return ipt_do_table(pskb, hook, in, out, &packet_raw, NULL); | |
98 | } | |
99 | ||
100 | /* 'raw' is the very first table. */ | |
101 | static struct nf_hook_ops ipt_ops[] = { | |
102 | { | |
103 | .hook = ipt_hook, | |
104 | .pf = PF_INET, | |
105 | .hooknum = NF_IP_PRE_ROUTING, | |
106 | .priority = NF_IP_PRI_RAW | |
107 | }, | |
108 | { | |
109 | .hook = ipt_hook, | |
110 | .pf = PF_INET, | |
111 | .hooknum = NF_IP_LOCAL_OUT, | |
112 | .priority = NF_IP_PRI_RAW | |
113 | }, | |
114 | }; | |
115 | ||
116 | static int __init init(void) | |
117 | { | |
118 | int ret; | |
119 | ||
120 | /* Register table */ | |
121 | ret = ipt_register_table(&packet_raw, &initial_table.repl); | |
122 | if (ret < 0) | |
123 | return ret; | |
124 | ||
125 | /* Register hooks */ | |
126 | ret = nf_register_hook(&ipt_ops[0]); | |
127 | if (ret < 0) | |
128 | goto cleanup_table; | |
129 | ||
130 | ret = nf_register_hook(&ipt_ops[1]); | |
131 | if (ret < 0) | |
132 | goto cleanup_hook0; | |
133 | ||
134 | return ret; | |
135 | ||
136 | cleanup_hook0: | |
137 | nf_unregister_hook(&ipt_ops[0]); | |
138 | cleanup_table: | |
139 | ipt_unregister_table(&packet_raw); | |
140 | ||
141 | return ret; | |
142 | } | |
143 | ||
144 | static void __exit fini(void) | |
145 | { | |
146 | unsigned int i; | |
147 | ||
148 | for (i = 0; i < sizeof(ipt_ops)/sizeof(struct nf_hook_ops); i++) | |
149 | nf_unregister_hook(&ipt_ops[i]); | |
150 | ||
151 | ipt_unregister_table(&packet_raw); | |
152 | } | |
153 | ||
154 | module_init(init); | |
155 | module_exit(fini); | |
156 | MODULE_LICENSE("GPL"); |