cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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ebtable_filter.c (2667B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 *  ebtable_filter
      4 *
      5 *	Authors:
      6 *	Bart De Schuymer <bdschuym@pandora.be>
      7 *
      8 *  April, 2002
      9 *
     10 */
     11
     12#include <linux/netfilter_bridge/ebtables.h>
     13#include <uapi/linux/netfilter_bridge.h>
     14#include <linux/module.h>
     15
     16#define FILTER_VALID_HOOKS ((1 << NF_BR_LOCAL_IN) | (1 << NF_BR_FORWARD) | \
     17			    (1 << NF_BR_LOCAL_OUT))
     18
     19static struct ebt_entries initial_chains[] = {
     20	{
     21		.name	= "INPUT",
     22		.policy	= EBT_ACCEPT,
     23	},
     24	{
     25		.name	= "FORWARD",
     26		.policy	= EBT_ACCEPT,
     27	},
     28	{
     29		.name	= "OUTPUT",
     30		.policy	= EBT_ACCEPT,
     31	},
     32};
     33
     34static struct ebt_replace_kernel initial_table = {
     35	.name		= "filter",
     36	.valid_hooks	= FILTER_VALID_HOOKS,
     37	.entries_size	= 3 * sizeof(struct ebt_entries),
     38	.hook_entry	= {
     39		[NF_BR_LOCAL_IN]	= &initial_chains[0],
     40		[NF_BR_FORWARD]		= &initial_chains[1],
     41		[NF_BR_LOCAL_OUT]	= &initial_chains[2],
     42	},
     43	.entries	= (char *)initial_chains,
     44};
     45
     46static int check(const struct ebt_table_info *info, unsigned int valid_hooks)
     47{
     48	if (valid_hooks & ~FILTER_VALID_HOOKS)
     49		return -EINVAL;
     50	return 0;
     51}
     52
     53static const struct ebt_table frame_filter = {
     54	.name		= "filter",
     55	.table		= &initial_table,
     56	.valid_hooks	= FILTER_VALID_HOOKS,
     57	.check		= check,
     58	.me		= THIS_MODULE,
     59};
     60
     61static const struct nf_hook_ops ebt_ops_filter[] = {
     62	{
     63		.hook		= ebt_do_table,
     64		.pf		= NFPROTO_BRIDGE,
     65		.hooknum	= NF_BR_LOCAL_IN,
     66		.priority	= NF_BR_PRI_FILTER_BRIDGED,
     67	},
     68	{
     69		.hook		= ebt_do_table,
     70		.pf		= NFPROTO_BRIDGE,
     71		.hooknum	= NF_BR_FORWARD,
     72		.priority	= NF_BR_PRI_FILTER_BRIDGED,
     73	},
     74	{
     75		.hook		= ebt_do_table,
     76		.pf		= NFPROTO_BRIDGE,
     77		.hooknum	= NF_BR_LOCAL_OUT,
     78		.priority	= NF_BR_PRI_FILTER_OTHER,
     79	},
     80};
     81
     82static int frame_filter_table_init(struct net *net)
     83{
     84	return ebt_register_table(net, &frame_filter, ebt_ops_filter);
     85}
     86
     87static void __net_exit frame_filter_net_pre_exit(struct net *net)
     88{
     89	ebt_unregister_table_pre_exit(net, "filter");
     90}
     91
     92static void __net_exit frame_filter_net_exit(struct net *net)
     93{
     94	ebt_unregister_table(net, "filter");
     95}
     96
     97static struct pernet_operations frame_filter_net_ops = {
     98	.exit = frame_filter_net_exit,
     99	.pre_exit = frame_filter_net_pre_exit,
    100};
    101
    102static int __init ebtable_filter_init(void)
    103{
    104	int ret = ebt_register_template(&frame_filter, frame_filter_table_init);
    105
    106	if (ret)
    107		return ret;
    108
    109	ret = register_pernet_subsys(&frame_filter_net_ops);
    110	if (ret) {
    111		ebt_unregister_template(&frame_filter);
    112		return ret;
    113	}
    114
    115	return 0;
    116}
    117
    118static void __exit ebtable_filter_fini(void)
    119{
    120	unregister_pernet_subsys(&frame_filter_net_ops);
    121	ebt_unregister_template(&frame_filter);
    122}
    123
    124module_init(ebtable_filter_init);
    125module_exit(ebtable_filter_fini);
    126MODULE_LICENSE("GPL");