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netfilter: arp_tables: allow use of arpt_do_table as hookfn

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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>
This commit is contained in:
Florian Westphal 2021-10-11 17:15:12 +02:00 committed by Pablo Neira Ayuso
parent 8844e01062
commit e8d225b600
3 changed files with 7 additions and 15 deletions
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5
include/linux/netfilter_arp/arp_tables.h
View File

@ -54,9 +54,8 @@ int arpt_register_table(struct net *net, const struct xt_table *table,
const struct nf_hook_ops *ops);
void arpt_unregister_table(struct net *net, const char *name);
void arpt_unregister_table_pre_exit(struct net *net, const char *name);
extern unsigned int arpt_do_table(struct sk_buff *skb,
const struct nf_hook_state *state,
struct xt_table *table);
extern unsigned int arpt_do_table(void *priv, struct sk_buff *skb,
const struct nf_hook_state *state);
#ifdef CONFIG_NETFILTER_XTABLES_COMPAT
#include <net/compat.h>

7
net/ipv4/netfilter/arp_tables.c
View File

@ -179,10 +179,11 @@ struct arpt_entry *arpt_next_entry(const struct arpt_entry *entry)
return (void *)entry + entry->next_offset;
}
unsigned int arpt_do_table(struct sk_buff *skb,
const struct nf_hook_state *state,
struct xt_table *table)
unsigned int arpt_do_table(void *priv,
struct sk_buff *skb,
const struct nf_hook_state *state)
{
const struct xt_table *table = priv;
unsigned int hook = state->hook;
static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long))));
unsigned int verdict = NF_DROP;

10
net/ipv4/netfilter/arptable_filter.c
View File

@ -26,14 +26,6 @@ static const struct xt_table packet_filter = {
.priority = NF_IP_PRI_FILTER,
};
/* The work comes in here from netfilter.c */
static unsigned int
arptable_filter_hook(void *priv, struct sk_buff *skb,
const struct nf_hook_state *state)
{
return arpt_do_table(skb, state, priv);
}
static struct nf_hook_ops *arpfilter_ops __read_mostly;
static int arptable_filter_table_init(struct net *net)
@ -72,7 +64,7 @@ static int __init arptable_filter_init(void)
if (ret < 0)
return ret;
arpfilter_ops = xt_hook_ops_alloc(&packet_filter, arptable_filter_hook);
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);