Staging
v0.5.1
v0.5.1
swh:1:snp:a902887e4be9191b7c6c4406aa06b31c1ce2c7cc
Tip revision: fdf0eaf11452d72945af31804e2a1048ee1b574c authored by Linus Torvalds on 16 July 2023, 22:10:37 UTC
Linux 6.5-rc2
Linux 6.5-rc2
Tip revision: fdf0eaf
arptable_filter.c
// SPDX-License-Identifier: GPL-2.0-only
/*
* Filtering ARP tables module.
*
* Copyright (C) 2002 David S. Miller (davem@redhat.com)
*
*/
#include <linux/module.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter_arp/arp_tables.h>
#include <linux/slab.h>
MODULE_LICENSE("GPL");
MODULE_AUTHOR("David S. Miller <davem@redhat.com>");
MODULE_DESCRIPTION("arptables filter table");
#define FILTER_VALID_HOOKS ((1 << NF_ARP_IN) | (1 << NF_ARP_OUT) | \
(1 << NF_ARP_FORWARD))
static const struct xt_table packet_filter = {
.name = "filter",
.valid_hooks = FILTER_VALID_HOOKS,
.me = THIS_MODULE,
.af = NFPROTO_ARP,
.priority = NF_IP_PRI_FILTER,
};
static struct nf_hook_ops *arpfilter_ops __read_mostly;
static int arptable_filter_table_init(struct net *net)
{
struct arpt_replace *repl;
int err;
repl = arpt_alloc_initial_table(&packet_filter);
if (repl == NULL)
return -ENOMEM;
err = arpt_register_table(net, &packet_filter, repl, arpfilter_ops);
kfree(repl);
return err;
}
static void __net_exit arptable_filter_net_pre_exit(struct net *net)
{
arpt_unregister_table_pre_exit(net, "filter");
}
static void __net_exit arptable_filter_net_exit(struct net *net)
{
arpt_unregister_table(net, "filter");
}
static struct pernet_operations arptable_filter_net_ops = {
.exit = arptable_filter_net_exit,
.pre_exit = arptable_filter_net_pre_exit,
};
static int __init arptable_filter_init(void)
{
int ret = xt_register_template(&packet_filter,
arptable_filter_table_init);
if (ret < 0)
return ret;
arpfilter_ops = xt_hook_ops_alloc(&packet_filter, arpt_do_table);
if (IS_ERR(arpfilter_ops)) {
xt_unregister_template(&packet_filter);
return PTR_ERR(arpfilter_ops);
}
ret = register_pernet_subsys(&arptable_filter_net_ops);
if (ret < 0) {
xt_unregister_template(&packet_filter);
kfree(arpfilter_ops);
return ret;
}
return ret;
}
static void __exit arptable_filter_fini(void)
{
unregister_pernet_subsys(&arptable_filter_net_ops);
xt_unregister_template(&packet_filter);
kfree(arpfilter_ops);
}
module_init(arptable_filter_init);
module_exit(arptable_filter_fini);