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- /*
- * 'raw' table, which is the very first hooked in at PRE_ROUTING and LOCAL_OUT .
- *
- * Copyright (C) 2003 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
- */
- #include <linux/module.h>
- #include <linux/netfilter_ipv4/ip_tables.h>
- #define RAW_VALID_HOOKS ((1 << NF_IP_PRE_ROUTING) | (1 << NF_IP_LOCAL_OUT))
- static struct
- {
- struct ipt_replace repl;
- struct ipt_standard entries[2];
- struct ipt_error term;
- } initial_table __initdata = {
- .repl = {
- .name = "raw",
- .valid_hooks = RAW_VALID_HOOKS,
- .num_entries = 3,
- .size = sizeof(struct ipt_standard) * 2 + sizeof(struct ipt_error),
- .hook_entry = {
- [NF_IP_PRE_ROUTING] = 0,
- [NF_IP_LOCAL_OUT] = sizeof(struct ipt_standard) },
- .underflow = {
- [NF_IP_PRE_ROUTING] = 0,
- [NF_IP_LOCAL_OUT] = sizeof(struct ipt_standard) },
- },
- .entries = {
- /* PRE_ROUTING */
- {
- .entry = {
- .target_offset = sizeof(struct ipt_entry),
- .next_offset = sizeof(struct ipt_standard),
- },
- .target = {
- .target = {
- .u = {
- .target_size = IPT_ALIGN(sizeof(struct ipt_standard_target)),
- },
- },
- .verdict = -NF_ACCEPT - 1,
- },
- },
- /* LOCAL_OUT */
- {
- .entry = {
- .target_offset = sizeof(struct ipt_entry),
- .next_offset = sizeof(struct ipt_standard),
- },
- .target = {
- .target = {
- .u = {
- .target_size = IPT_ALIGN(sizeof(struct ipt_standard_target)),
- },
- },
- .verdict = -NF_ACCEPT - 1,
- },
- },
- },
- /* ERROR */
- .term = {
- .entry = {
- .target_offset = sizeof(struct ipt_entry),
- .next_offset = sizeof(struct ipt_error),
- },
- .target = {
- .target = {
- .u = {
- .user = {
- .target_size = IPT_ALIGN(sizeof(struct ipt_error_target)),
- .name = IPT_ERROR_TARGET,
- },
- },
- },
- .errorname = "ERROR",
- },
- }
- };
- static struct xt_table packet_raw = {
- .name = "raw",
- .valid_hooks = RAW_VALID_HOOKS,
- .lock = RW_LOCK_UNLOCKED,
- .me = THIS_MODULE,
- .af = AF_INET,
- };
- /* The work comes in here from netfilter.c. */
- static unsigned int
- ipt_hook(unsigned int hook,
- struct sk_buff **pskb,
- const struct net_device *in,
- const struct net_device *out,
- int (*okfn)(struct sk_buff *))
- {
- return ipt_do_table(pskb, hook, in, out, &packet_raw);
- }
- /* 'raw' is the very first table. */
- static struct nf_hook_ops ipt_ops[] = {
- {
- .hook = ipt_hook,
- .pf = PF_INET,
- .hooknum = NF_IP_PRE_ROUTING,
- .priority = NF_IP_PRI_RAW,
- .owner = THIS_MODULE,
- },
- {
- .hook = ipt_hook,
- .pf = PF_INET,
- .hooknum = NF_IP_LOCAL_OUT,
- .priority = NF_IP_PRI_RAW,
- .owner = THIS_MODULE,
- },
- };
- static int __init iptable_raw_init(void)
- {
- int ret;
- /* Register table */
- ret = ipt_register_table(&packet_raw, &initial_table.repl);
- if (ret < 0)
- return ret;
- /* Register hooks */
- ret = nf_register_hooks(ipt_ops, ARRAY_SIZE(ipt_ops));
- if (ret < 0)
- goto cleanup_table;
- return ret;
- cleanup_table:
- ipt_unregister_table(&packet_raw);
- return ret;
- }
- static void __exit iptable_raw_fini(void)
- {
- nf_unregister_hooks(ipt_ops, ARRAY_SIZE(ipt_ops));
- ipt_unregister_table(&packet_raw);
- }
- module_init(iptable_raw_init);
- module_exit(iptable_raw_fini);
- MODULE_LICENSE("GPL");
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