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, |
2b95efe7 | 44 | .priority = NF_IP_PRI_RAW, |
1da177e4 LT |
45 | }; |
46 | ||
47 | /* The work comes in here from netfilter.c. */ | |
48 | static unsigned int | |
737535c5 JE |
49 | iptable_raw_hook(unsigned int hook, struct sk_buff *skb, |
50 | const struct net_device *in, const struct net_device *out, | |
51 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 52 | { |
2b21e051 | 53 | const struct net *net; |
1da177e4 | 54 | |
2b21e051 JE |
55 | if (hook == NF_INET_LOCAL_OUT && |
56 | (skb->len < sizeof(struct iphdr) || | |
57 | ip_hdrlen(skb) < sizeof(struct iphdr))) | |
58 | /* root is playing with raw sockets. */ | |
802169a4 | 59 | return NF_ACCEPT; |
2b21e051 JE |
60 | |
61 | net = dev_net((in != NULL) ? in : out); | |
62 | return ipt_do_table(skb, hook, in, out, net->ipv4.iptable_raw); | |
802169a4 PM |
63 | } |
64 | ||
2b95efe7 | 65 | static struct nf_hook_ops *rawtable_ops __read_mostly; |
1da177e4 | 66 | |
9335f047 AD |
67 | static int __net_init iptable_raw_net_init(struct net *net) |
68 | { | |
69 | /* Register table */ | |
70 | net->ipv4.iptable_raw = | |
71 | ipt_register_table(net, &packet_raw, &initial_table.repl); | |
72 | if (IS_ERR(net->ipv4.iptable_raw)) | |
73 | return PTR_ERR(net->ipv4.iptable_raw); | |
74 | return 0; | |
75 | } | |
76 | ||
77 | static void __net_exit iptable_raw_net_exit(struct net *net) | |
78 | { | |
f54e9367 | 79 | ipt_unregister_table(net, net->ipv4.iptable_raw); |
9335f047 AD |
80 | } |
81 | ||
82 | static struct pernet_operations iptable_raw_net_ops = { | |
83 | .init = iptable_raw_net_init, | |
84 | .exit = iptable_raw_net_exit, | |
85 | }; | |
86 | ||
65b4b4e8 | 87 | static int __init iptable_raw_init(void) |
1da177e4 LT |
88 | { |
89 | int ret; | |
90 | ||
9335f047 AD |
91 | ret = register_pernet_subsys(&iptable_raw_net_ops); |
92 | if (ret < 0) | |
93 | return ret; | |
1da177e4 LT |
94 | |
95 | /* Register hooks */ | |
2b95efe7 JE |
96 | rawtable_ops = xt_hook_link(&packet_raw, iptable_raw_hook); |
97 | if (IS_ERR(rawtable_ops)) { | |
98 | ret = PTR_ERR(rawtable_ops); | |
1da177e4 | 99 | goto cleanup_table; |
2b95efe7 | 100 | } |
1da177e4 | 101 | |
1da177e4 LT |
102 | return ret; |
103 | ||
1da177e4 | 104 | cleanup_table: |
9335f047 | 105 | unregister_pernet_subsys(&iptable_raw_net_ops); |
1da177e4 LT |
106 | return ret; |
107 | } | |
108 | ||
65b4b4e8 | 109 | static void __exit iptable_raw_fini(void) |
1da177e4 | 110 | { |
2b95efe7 | 111 | xt_hook_unlink(&packet_raw, rawtable_ops); |
9335f047 | 112 | unregister_pernet_subsys(&iptable_raw_net_ops); |
1da177e4 LT |
113 | } |
114 | ||
65b4b4e8 AM |
115 | module_init(iptable_raw_init); |
116 | module_exit(iptable_raw_fini); | |
1da177e4 | 117 | MODULE_LICENSE("GPL"); |