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![Florian Westphal](/assets/img/avatar_default.png)
This is possible now that the xt_table structure is passed in via *priv. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
91 lines
2.1 KiB
C
91 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Filtering ARP tables module.
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*
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* Copyright (C) 2002 David S. Miller (davem@redhat.com)
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*
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*/
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#include <linux/module.h>
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#include <linux/netfilter/x_tables.h>
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#include <linux/netfilter_arp/arp_tables.h>
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#include <linux/slab.h>
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("David S. Miller <davem@redhat.com>");
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MODULE_DESCRIPTION("arptables filter table");
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#define FILTER_VALID_HOOKS ((1 << NF_ARP_IN) | (1 << NF_ARP_OUT) | \
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(1 << NF_ARP_FORWARD))
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static const struct xt_table packet_filter = {
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.name = "filter",
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.valid_hooks = FILTER_VALID_HOOKS,
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.me = THIS_MODULE,
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.af = NFPROTO_ARP,
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.priority = NF_IP_PRI_FILTER,
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};
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static struct nf_hook_ops *arpfilter_ops __read_mostly;
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static int arptable_filter_table_init(struct net *net)
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{
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struct arpt_replace *repl;
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int err;
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repl = arpt_alloc_initial_table(&packet_filter);
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if (repl == NULL)
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return -ENOMEM;
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err = arpt_register_table(net, &packet_filter, repl, arpfilter_ops);
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kfree(repl);
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return err;
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}
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static void __net_exit arptable_filter_net_pre_exit(struct net *net)
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{
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arpt_unregister_table_pre_exit(net, "filter");
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}
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static void __net_exit arptable_filter_net_exit(struct net *net)
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{
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arpt_unregister_table(net, "filter");
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}
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static struct pernet_operations arptable_filter_net_ops = {
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.exit = arptable_filter_net_exit,
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.pre_exit = arptable_filter_net_pre_exit,
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};
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static int __init arptable_filter_init(void)
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{
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int ret = xt_register_template(&packet_filter,
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arptable_filter_table_init);
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if (ret < 0)
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return ret;
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arpfilter_ops = xt_hook_ops_alloc(&packet_filter, arpt_do_table);
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if (IS_ERR(arpfilter_ops)) {
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xt_unregister_template(&packet_filter);
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return PTR_ERR(arpfilter_ops);
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}
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ret = register_pernet_subsys(&arptable_filter_net_ops);
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if (ret < 0) {
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xt_unregister_template(&packet_filter);
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kfree(arpfilter_ops);
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return ret;
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}
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return ret;
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}
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static void __exit arptable_filter_fini(void)
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{
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unregister_pernet_subsys(&arptable_filter_net_ops);
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xt_unregister_template(&packet_filter);
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kfree(arpfilter_ops);
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}
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module_init(arptable_filter_init);
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module_exit(arptable_filter_fini);
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