Commit | Line | Data |
---|---|---|
e905a9ed | 1 | /* |
1da177e4 LT |
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> | |
802169a4 | 8 | #include <net/ip.h> |
1da177e4 | 9 | |
6e23ae2a | 10 | #define RAW_VALID_HOOKS ((1 << NF_INET_PRE_ROUTING) | (1 << NF_INET_LOCAL_OUT)) |
1da177e4 | 11 | |
35aad0ff | 12 | static const struct |
1da177e4 LT |
13 | { |
14 | struct ipt_replace repl; | |
15 | struct ipt_standard entries[2]; | |
16 | struct ipt_error term; | |
9335f047 | 17 | } initial_table __net_initdata = { |
1da177e4 | 18 | .repl = { |
e905a9ed YH |
19 | .name = "raw", |
20 | .valid_hooks = RAW_VALID_HOOKS, | |
1da177e4 LT |
21 | .num_entries = 3, |
22 | .size = sizeof(struct ipt_standard) * 2 + sizeof(struct ipt_error), | |
e905a9ed | 23 | .hook_entry = { |
6e23ae2a PM |
24 | [NF_INET_PRE_ROUTING] = 0, |
25 | [NF_INET_LOCAL_OUT] = sizeof(struct ipt_standard) | |
3c2ad469 | 26 | }, |
e905a9ed | 27 | .underflow = { |
6e23ae2a PM |
28 | [NF_INET_PRE_ROUTING] = 0, |
29 | [NF_INET_LOCAL_OUT] = sizeof(struct ipt_standard) | |
3c2ad469 | 30 | }, |
1da177e4 LT |
31 | }, |
32 | .entries = { | |
3c2ad469 PM |
33 | IPT_STANDARD_INIT(NF_ACCEPT), /* PRE_ROUTING */ |
34 | IPT_STANDARD_INIT(NF_ACCEPT), /* LOCAL_OUT */ | |
1da177e4 | 35 | }, |
3c2ad469 | 36 | .term = IPT_ERROR_INIT, /* ERROR */ |
1da177e4 LT |
37 | }; |
38 | ||
35aad0ff | 39 | static const struct xt_table packet_raw = { |
e905a9ed YH |
40 | .name = "raw", |
41 | .valid_hooks = RAW_VALID_HOOKS, | |
2e4e6a17 | 42 | .me = THIS_MODULE, |
f88e6a8a | 43 | .af = NFPROTO_IPV4, |
1da177e4 LT |
44 | }; |
45 | ||
46 | /* The work comes in here from netfilter.c. */ | |
47 | static unsigned int | |
737535c5 JE |
48 | iptable_raw_hook(unsigned int hook, struct sk_buff *skb, |
49 | const struct net_device *in, const struct net_device *out, | |
50 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 51 | { |
737535c5 JE |
52 | if (hook == NF_INET_PRE_ROUTING) |
53 | return ipt_do_table(skb, hook, in, out, | |
54 | dev_net(in)->ipv4.iptable_raw); | |
1da177e4 | 55 | |
737535c5 | 56 | /* OUTPUT: */ |
802169a4 | 57 | /* root is playing with raw sockets. */ |
3db05fea | 58 | if (skb->len < sizeof(struct iphdr) || |
88843104 | 59 | ip_hdrlen(skb) < sizeof(struct iphdr)) |
802169a4 | 60 | return NF_ACCEPT; |
666953df | 61 | return ipt_do_table(skb, hook, in, out, |
48dc7865 | 62 | dev_net(out)->ipv4.iptable_raw); |
802169a4 PM |
63 | } |
64 | ||
1da177e4 | 65 | /* 'raw' is the very first table. */ |
1999414a | 66 | static struct nf_hook_ops ipt_ops[] __read_mostly = { |
1da177e4 | 67 | { |
737535c5 | 68 | .hook = iptable_raw_hook, |
24c232d8 | 69 | .pf = NFPROTO_IPV4, |
6e23ae2a | 70 | .hooknum = NF_INET_PRE_ROUTING, |
964ddaa1 PM |
71 | .priority = NF_IP_PRI_RAW, |
72 | .owner = THIS_MODULE, | |
1da177e4 LT |
73 | }, |
74 | { | |
737535c5 | 75 | .hook = iptable_raw_hook, |
24c232d8 | 76 | .pf = NFPROTO_IPV4, |
6e23ae2a | 77 | .hooknum = NF_INET_LOCAL_OUT, |
964ddaa1 PM |
78 | .priority = NF_IP_PRI_RAW, |
79 | .owner = THIS_MODULE, | |
1da177e4 LT |
80 | }, |
81 | }; | |
82 | ||
9335f047 AD |
83 | static int __net_init iptable_raw_net_init(struct net *net) |
84 | { | |
85 | /* Register table */ | |
86 | net->ipv4.iptable_raw = | |
87 | ipt_register_table(net, &packet_raw, &initial_table.repl); | |
88 | if (IS_ERR(net->ipv4.iptable_raw)) | |
89 | return PTR_ERR(net->ipv4.iptable_raw); | |
90 | return 0; | |
91 | } | |
92 | ||
93 | static void __net_exit iptable_raw_net_exit(struct net *net) | |
94 | { | |
f54e9367 | 95 | ipt_unregister_table(net, net->ipv4.iptable_raw); |
9335f047 AD |
96 | } |
97 | ||
98 | static struct pernet_operations iptable_raw_net_ops = { | |
99 | .init = iptable_raw_net_init, | |
100 | .exit = iptable_raw_net_exit, | |
101 | }; | |
102 | ||
65b4b4e8 | 103 | static int __init iptable_raw_init(void) |
1da177e4 LT |
104 | { |
105 | int ret; | |
106 | ||
9335f047 AD |
107 | ret = register_pernet_subsys(&iptable_raw_net_ops); |
108 | if (ret < 0) | |
109 | return ret; | |
1da177e4 LT |
110 | |
111 | /* Register hooks */ | |
964ddaa1 | 112 | ret = nf_register_hooks(ipt_ops, ARRAY_SIZE(ipt_ops)); |
1da177e4 LT |
113 | if (ret < 0) |
114 | goto cleanup_table; | |
115 | ||
1da177e4 LT |
116 | return ret; |
117 | ||
1da177e4 | 118 | cleanup_table: |
9335f047 | 119 | unregister_pernet_subsys(&iptable_raw_net_ops); |
1da177e4 LT |
120 | return ret; |
121 | } | |
122 | ||
65b4b4e8 | 123 | static void __exit iptable_raw_fini(void) |
1da177e4 | 124 | { |
964ddaa1 | 125 | nf_unregister_hooks(ipt_ops, ARRAY_SIZE(ipt_ops)); |
9335f047 | 126 | unregister_pernet_subsys(&iptable_raw_net_ops); |
1da177e4 LT |
127 | } |
128 | ||
65b4b4e8 AM |
129 | module_init(iptable_raw_init); |
130 | module_exit(iptable_raw_fini); | |
1da177e4 | 131 | MODULE_LICENSE("GPL"); |