![Thomas Gleixner](/assets/img/avatar_default.png)
Add SPDX license identifiers to all files which: - Have no license information of any form - Have MODULE_LICENCE("GPL*") inside which was used in the initial scan/conversion to ignore the file These files fall under the project license, GPL v2 only. The resulting SPDX license identifier is: GPL-2.0-only Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
102 lines
2.4 KiB
C
102 lines
2.4 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 int __net_init arptable_filter_table_init(struct net *net);
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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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.table_init = arptable_filter_table_init,
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};
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/* The work comes in here from netfilter.c */
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static unsigned int
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arptable_filter_hook(void *priv, struct sk_buff *skb,
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const struct nf_hook_state *state)
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{
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return arpt_do_table(skb, state, state->net->ipv4.arptable_filter);
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}
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static struct nf_hook_ops *arpfilter_ops __read_mostly;
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static int __net_init 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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if (net->ipv4.arptable_filter)
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return 0;
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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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&net->ipv4.arptable_filter);
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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_exit(struct net *net)
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{
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if (!net->ipv4.arptable_filter)
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return;
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arpt_unregister_table(net, net->ipv4.arptable_filter, arpfilter_ops);
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net->ipv4.arptable_filter = NULL;
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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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};
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static int __init arptable_filter_init(void)
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{
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int ret;
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arpfilter_ops = xt_hook_ops_alloc(&packet_filter, arptable_filter_hook);
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if (IS_ERR(arpfilter_ops))
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return PTR_ERR(arpfilter_ops);
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ret = register_pernet_subsys(&arptable_filter_net_ops);
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if (ret < 0) {
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kfree(arpfilter_ops);
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return ret;
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}
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ret = arptable_filter_table_init(&init_net);
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if (ret) {
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unregister_pernet_subsys(&arptable_filter_net_ops);
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kfree(arpfilter_ops);
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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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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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