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 LT |
11 | |
12 | static struct | |
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 | ||
9335f047 | 39 | static struct xt_table packet_raw = { |
e905a9ed YH |
40 | .name = "raw", |
41 | .valid_hooks = RAW_VALID_HOOKS, | |
fdccecd0 | 42 | .lock = __RW_LOCK_UNLOCKED(packet_raw.lock), |
2e4e6a17 HW |
43 | .me = THIS_MODULE, |
44 | .af = AF_INET, | |
1da177e4 LT |
45 | }; |
46 | ||
47 | /* The work comes in here from netfilter.c. */ | |
48 | static unsigned int | |
49 | ipt_hook(unsigned int hook, | |
3db05fea | 50 | struct sk_buff *skb, |
1da177e4 LT |
51 | const struct net_device *in, |
52 | const struct net_device *out, | |
53 | int (*okfn)(struct sk_buff *)) | |
54 | { | |
666953df | 55 | return ipt_do_table(skb, hook, in, out, |
48dc7865 | 56 | dev_net(in)->ipv4.iptable_raw); |
1da177e4 LT |
57 | } |
58 | ||
802169a4 PM |
59 | static unsigned int |
60 | ipt_local_hook(unsigned int hook, | |
3db05fea | 61 | struct sk_buff *skb, |
802169a4 PM |
62 | const struct net_device *in, |
63 | const struct net_device *out, | |
64 | int (*okfn)(struct sk_buff *)) | |
65 | { | |
66 | /* root is playing with raw sockets. */ | |
3db05fea HX |
67 | if (skb->len < sizeof(struct iphdr) || |
68 | ip_hdrlen(skb) < sizeof(struct iphdr)) { | |
802169a4 | 69 | if (net_ratelimit()) |
464c4f18 | 70 | printk("iptable_raw: ignoring short SOCK_RAW " |
802169a4 PM |
71 | "packet.\n"); |
72 | return NF_ACCEPT; | |
73 | } | |
666953df | 74 | return ipt_do_table(skb, hook, in, out, |
48dc7865 | 75 | dev_net(out)->ipv4.iptable_raw); |
802169a4 PM |
76 | } |
77 | ||
1da177e4 | 78 | /* 'raw' is the very first table. */ |
1999414a | 79 | static struct nf_hook_ops ipt_ops[] __read_mostly = { |
1da177e4 | 80 | { |
964ddaa1 PM |
81 | .hook = ipt_hook, |
82 | .pf = PF_INET, | |
6e23ae2a | 83 | .hooknum = NF_INET_PRE_ROUTING, |
964ddaa1 PM |
84 | .priority = NF_IP_PRI_RAW, |
85 | .owner = THIS_MODULE, | |
1da177e4 LT |
86 | }, |
87 | { | |
802169a4 | 88 | .hook = ipt_local_hook, |
964ddaa1 | 89 | .pf = PF_INET, |
6e23ae2a | 90 | .hooknum = NF_INET_LOCAL_OUT, |
964ddaa1 PM |
91 | .priority = NF_IP_PRI_RAW, |
92 | .owner = THIS_MODULE, | |
1da177e4 LT |
93 | }, |
94 | }; | |
95 | ||
9335f047 AD |
96 | static int __net_init iptable_raw_net_init(struct net *net) |
97 | { | |
98 | /* Register table */ | |
99 | net->ipv4.iptable_raw = | |
100 | ipt_register_table(net, &packet_raw, &initial_table.repl); | |
101 | if (IS_ERR(net->ipv4.iptable_raw)) | |
102 | return PTR_ERR(net->ipv4.iptable_raw); | |
103 | return 0; | |
104 | } | |
105 | ||
106 | static void __net_exit iptable_raw_net_exit(struct net *net) | |
107 | { | |
108 | ipt_unregister_table(net->ipv4.iptable_raw); | |
109 | } | |
110 | ||
111 | static struct pernet_operations iptable_raw_net_ops = { | |
112 | .init = iptable_raw_net_init, | |
113 | .exit = iptable_raw_net_exit, | |
114 | }; | |
115 | ||
65b4b4e8 | 116 | static int __init iptable_raw_init(void) |
1da177e4 LT |
117 | { |
118 | int ret; | |
119 | ||
9335f047 AD |
120 | ret = register_pernet_subsys(&iptable_raw_net_ops); |
121 | if (ret < 0) | |
122 | return ret; | |
1da177e4 LT |
123 | |
124 | /* Register hooks */ | |
964ddaa1 | 125 | ret = nf_register_hooks(ipt_ops, ARRAY_SIZE(ipt_ops)); |
1da177e4 LT |
126 | if (ret < 0) |
127 | goto cleanup_table; | |
128 | ||
1da177e4 LT |
129 | return ret; |
130 | ||
1da177e4 | 131 | cleanup_table: |
9335f047 | 132 | unregister_pernet_subsys(&iptable_raw_net_ops); |
1da177e4 LT |
133 | return ret; |
134 | } | |
135 | ||
65b4b4e8 | 136 | static void __exit iptable_raw_fini(void) |
1da177e4 | 137 | { |
964ddaa1 | 138 | nf_unregister_hooks(ipt_ops, ARRAY_SIZE(ipt_ops)); |
9335f047 | 139 | unregister_pernet_subsys(&iptable_raw_net_ops); |
1da177e4 LT |
140 | } |
141 | ||
65b4b4e8 AM |
142 | module_init(iptable_raw_init); |
143 | module_exit(iptable_raw_fini); | |
1da177e4 | 144 | MODULE_LICENSE("GPL"); |