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 #include <net/ip.h>
9
10 #define RAW_VALID_HOOKS ((1 << NF_INET_PRE_ROUTING) | (1 << NF_INET_LOCAL_OUT))
11
12 static struct
13 {
14 struct ipt_replace repl;
15 struct ipt_standard entries[2];
16 struct ipt_error term;
17 } initial_table __net_initdata = {
18 .repl = {
19 .name = "raw",
20 .valid_hooks = RAW_VALID_HOOKS,
21 .num_entries = 3,
22 .size = sizeof(struct ipt_standard) * 2 + sizeof(struct ipt_error),
23 .hook_entry = {
24 [NF_INET_PRE_ROUTING] = 0,
25 [NF_INET_LOCAL_OUT] = sizeof(struct ipt_standard)
26 },
27 .underflow = {
28 [NF_INET_PRE_ROUTING] = 0,
29 [NF_INET_LOCAL_OUT] = sizeof(struct ipt_standard)
30 },
31 },
32 .entries = {
33 IPT_STANDARD_INIT(NF_ACCEPT), /* PRE_ROUTING */
34 IPT_STANDARD_INIT(NF_ACCEPT), /* LOCAL_OUT */
35 },
36 .term = IPT_ERROR_INIT, /* ERROR */
37 };
38
39 static struct xt_table packet_raw = {
40 .name = "raw",
41 .valid_hooks = RAW_VALID_HOOKS,
42 .lock = RW_LOCK_UNLOCKED,
43 .me = THIS_MODULE,
44 .af = AF_INET,
45 };
46
47 /* The work comes in here from netfilter.c. */
48 static unsigned int
49 ipt_hook(unsigned int hook,
50 struct sk_buff *skb,
51 const struct net_device *in,
52 const struct net_device *out,
53 int (*okfn)(struct sk_buff *))
54 {
55 return ipt_do_table(skb, hook, in, out, init_net.ipv4.iptable_raw);
56 }
57
58 static unsigned int
59 ipt_local_hook(unsigned int hook,
60 struct sk_buff *skb,
61 const struct net_device *in,
62 const struct net_device *out,
63 int (*okfn)(struct sk_buff *))
64 {
65 /* root is playing with raw sockets. */
66 if (skb->len < sizeof(struct iphdr) ||
67 ip_hdrlen(skb) < sizeof(struct iphdr)) {
68 if (net_ratelimit())
69 printk("iptable_raw: ignoring short SOCK_RAW "
70 "packet.\n");
71 return NF_ACCEPT;
72 }
73 return ipt_do_table(skb, hook, in, out, init_net.ipv4.iptable_raw);
74 }
75
76 /* 'raw' is the very first table. */
77 static struct nf_hook_ops ipt_ops[] __read_mostly = {
78 {
79 .hook = ipt_hook,
80 .pf = PF_INET,
81 .hooknum = NF_INET_PRE_ROUTING,
82 .priority = NF_IP_PRI_RAW,
83 .owner = THIS_MODULE,
84 },
85 {
86 .hook = ipt_local_hook,
87 .pf = PF_INET,
88 .hooknum = NF_INET_LOCAL_OUT,
89 .priority = NF_IP_PRI_RAW,
90 .owner = THIS_MODULE,
91 },
92 };
93
94 static int __net_init iptable_raw_net_init(struct net *net)
95 {
96 /* Register table */
97 net->ipv4.iptable_raw =
98 ipt_register_table(net, &packet_raw, &initial_table.repl);
99 if (IS_ERR(net->ipv4.iptable_raw))
100 return PTR_ERR(net->ipv4.iptable_raw);
101 return 0;
102 }
103
104 static void __net_exit iptable_raw_net_exit(struct net *net)
105 {
106 ipt_unregister_table(net->ipv4.iptable_raw);
107 }
108
109 static struct pernet_operations iptable_raw_net_ops = {
110 .init = iptable_raw_net_init,
111 .exit = iptable_raw_net_exit,
112 };
113
114 static int __init iptable_raw_init(void)
115 {
116 int ret;
117
118 ret = register_pernet_subsys(&iptable_raw_net_ops);
119 if (ret < 0)
120 return ret;
121
122 /* Register hooks */
123 ret = nf_register_hooks(ipt_ops, ARRAY_SIZE(ipt_ops));
124 if (ret < 0)
125 goto cleanup_table;
126
127 return ret;
128
129 cleanup_table:
130 unregister_pernet_subsys(&iptable_raw_net_ops);
131 return ret;
132 }
133
134 static void __exit iptable_raw_fini(void)
135 {
136 nf_unregister_hooks(ipt_ops, ARRAY_SIZE(ipt_ops));
137 unregister_pernet_subsys(&iptable_raw_net_ops);
138 }
139
140 module_init(iptable_raw_init);
141 module_exit(iptable_raw_fini);
142 MODULE_LICENSE("GPL");
143
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