2005-04-16 22:20:36 +00:00
|
|
|
/*
|
|
|
|
* Filtering ARP tables module.
|
|
|
|
*
|
|
|
|
* Copyright (C) 2002 David S. Miller (davem@redhat.com)
|
|
|
|
*
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include <linux/module.h>
|
|
|
|
#include <linux/netfilter_arp/arp_tables.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))
|
|
|
|
|
|
|
|
/* Standard entry. */
|
|
|
|
struct arpt_standard
|
|
|
|
{
|
|
|
|
struct arpt_entry entry;
|
|
|
|
struct arpt_standard_target target;
|
|
|
|
};
|
|
|
|
|
|
|
|
struct arpt_error_target
|
|
|
|
{
|
|
|
|
struct arpt_entry_target target;
|
|
|
|
char errorname[ARPT_FUNCTION_MAXNAMELEN];
|
|
|
|
};
|
|
|
|
|
|
|
|
struct arpt_error
|
|
|
|
{
|
|
|
|
struct arpt_entry entry;
|
|
|
|
struct arpt_error_target target;
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct
|
|
|
|
{
|
|
|
|
struct arpt_replace repl;
|
|
|
|
struct arpt_standard entries[3];
|
|
|
|
struct arpt_error term;
|
|
|
|
} initial_table __initdata
|
|
|
|
= { { "filter", FILTER_VALID_HOOKS, 4,
|
|
|
|
sizeof(struct arpt_standard) * 3 + sizeof(struct arpt_error),
|
|
|
|
{ [NF_ARP_IN] = 0,
|
|
|
|
[NF_ARP_OUT] = sizeof(struct arpt_standard),
|
|
|
|
[NF_ARP_FORWARD] = 2 * sizeof(struct arpt_standard), },
|
|
|
|
{ [NF_ARP_IN] = 0,
|
|
|
|
[NF_ARP_OUT] = sizeof(struct arpt_standard),
|
|
|
|
[NF_ARP_FORWARD] = 2 * sizeof(struct arpt_standard), },
|
|
|
|
0, NULL, { } },
|
|
|
|
{
|
|
|
|
/* ARP_IN */
|
|
|
|
{
|
|
|
|
{
|
|
|
|
{
|
|
|
|
{ 0 }, { 0 }, { 0 }, { 0 },
|
|
|
|
0, 0,
|
|
|
|
{ { 0, }, { 0, } },
|
|
|
|
{ { 0, }, { 0, } },
|
|
|
|
0, 0,
|
|
|
|
0, 0,
|
|
|
|
0, 0,
|
|
|
|
"", "", { 0 }, { 0 },
|
|
|
|
0, 0
|
|
|
|
},
|
|
|
|
sizeof(struct arpt_entry),
|
|
|
|
sizeof(struct arpt_standard),
|
|
|
|
0,
|
|
|
|
{ 0, 0 }, { } },
|
|
|
|
{ { { { ARPT_ALIGN(sizeof(struct arpt_standard_target)), "" } }, { } },
|
|
|
|
-NF_ACCEPT - 1 }
|
|
|
|
},
|
|
|
|
/* ARP_OUT */
|
|
|
|
{
|
|
|
|
{
|
|
|
|
{
|
|
|
|
{ 0 }, { 0 }, { 0 }, { 0 },
|
|
|
|
0, 0,
|
|
|
|
{ { 0, }, { 0, } },
|
|
|
|
{ { 0, }, { 0, } },
|
|
|
|
0, 0,
|
|
|
|
0, 0,
|
|
|
|
0, 0,
|
|
|
|
"", "", { 0 }, { 0 },
|
|
|
|
0, 0
|
|
|
|
},
|
|
|
|
sizeof(struct arpt_entry),
|
|
|
|
sizeof(struct arpt_standard),
|
|
|
|
0,
|
|
|
|
{ 0, 0 }, { } },
|
|
|
|
{ { { { ARPT_ALIGN(sizeof(struct arpt_standard_target)), "" } }, { } },
|
|
|
|
-NF_ACCEPT - 1 }
|
|
|
|
},
|
|
|
|
/* ARP_FORWARD */
|
|
|
|
{
|
|
|
|
{
|
|
|
|
{
|
|
|
|
{ 0 }, { 0 }, { 0 }, { 0 },
|
|
|
|
0, 0,
|
|
|
|
{ { 0, }, { 0, } },
|
|
|
|
{ { 0, }, { 0, } },
|
|
|
|
0, 0,
|
|
|
|
0, 0,
|
|
|
|
0, 0,
|
|
|
|
"", "", { 0 }, { 0 },
|
|
|
|
0, 0
|
|
|
|
},
|
|
|
|
sizeof(struct arpt_entry),
|
|
|
|
sizeof(struct arpt_standard),
|
|
|
|
0,
|
|
|
|
{ 0, 0 }, { } },
|
|
|
|
{ { { { ARPT_ALIGN(sizeof(struct arpt_standard_target)), "" } }, { } },
|
|
|
|
-NF_ACCEPT - 1 }
|
|
|
|
}
|
|
|
|
},
|
|
|
|
/* ERROR */
|
|
|
|
{
|
|
|
|
{
|
|
|
|
{
|
|
|
|
{ 0 }, { 0 }, { 0 }, { 0 },
|
|
|
|
0, 0,
|
|
|
|
{ { 0, }, { 0, } },
|
|
|
|
{ { 0, }, { 0, } },
|
|
|
|
0, 0,
|
|
|
|
0, 0,
|
|
|
|
0, 0,
|
|
|
|
"", "", { 0 }, { 0 },
|
|
|
|
0, 0
|
|
|
|
},
|
|
|
|
sizeof(struct arpt_entry),
|
|
|
|
sizeof(struct arpt_error),
|
|
|
|
0,
|
|
|
|
{ 0, 0 }, { } },
|
|
|
|
{ { { { ARPT_ALIGN(sizeof(struct arpt_error_target)), ARPT_ERROR_TARGET } },
|
|
|
|
{ } },
|
|
|
|
"ERROR"
|
|
|
|
}
|
|
|
|
}
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct arpt_table packet_filter = {
|
|
|
|
.name = "filter",
|
|
|
|
.valid_hooks = FILTER_VALID_HOOKS,
|
|
|
|
.lock = RW_LOCK_UNLOCKED,
|
|
|
|
.private = NULL,
|
|
|
|
.me = THIS_MODULE,
|
[NETFILTER] x_tables: Abstraction layer for {ip,ip6,arp}_tables
This monster-patch tries to do the best job for unifying the data
structures and backend interfaces for the three evil clones ip_tables,
ip6_tables and arp_tables. In an ideal world we would never have
allowed this kind of copy+paste programming... but well, our world
isn't (yet?) ideal.
o introduce a new x_tables module
o {ip,arp,ip6}_tables depend on this x_tables module
o registration functions for tables, matches and targets are only
wrappers around x_tables provided functions
o all matches/targets that are used from ip_tables and ip6_tables
are now implemented as xt_FOOBAR.c files and provide module aliases
to ipt_FOOBAR and ip6t_FOOBAR
o header files for xt_matches are in include/linux/netfilter/,
include/linux/netfilter_{ipv4,ipv6} contains compatibility wrappers
around the xt_FOOBAR.h headers
Based on this patchset we're going to further unify the code,
gradually getting rid of all the layer 3 specific assumptions.
Signed-off-by: Harald Welte <laforge@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-12 21:30:04 +00:00
|
|
|
.af = NF_ARP,
|
2005-04-16 22:20:36 +00:00
|
|
|
};
|
|
|
|
|
|
|
|
/* The work comes in here from netfilter.c */
|
|
|
|
static unsigned int arpt_hook(unsigned int hook,
|
|
|
|
struct sk_buff **pskb,
|
|
|
|
const struct net_device *in,
|
|
|
|
const struct net_device *out,
|
|
|
|
int (*okfn)(struct sk_buff *))
|
|
|
|
{
|
|
|
|
return arpt_do_table(pskb, hook, in, out, &packet_filter, NULL);
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct nf_hook_ops arpt_ops[] = {
|
|
|
|
{
|
|
|
|
.hook = arpt_hook,
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
.pf = NF_ARP,
|
|
|
|
.hooknum = NF_ARP_IN,
|
|
|
|
},
|
|
|
|
{
|
|
|
|
.hook = arpt_hook,
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
.pf = NF_ARP,
|
|
|
|
.hooknum = NF_ARP_OUT,
|
|
|
|
},
|
|
|
|
{
|
|
|
|
.hook = arpt_hook,
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
.pf = NF_ARP,
|
|
|
|
.hooknum = NF_ARP_FORWARD,
|
|
|
|
},
|
|
|
|
};
|
|
|
|
|
2006-03-29 00:37:06 +00:00
|
|
|
static int __init arptable_filter_init(void)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
int ret, i;
|
|
|
|
|
|
|
|
/* Register table */
|
|
|
|
ret = arpt_register_table(&packet_filter, &initial_table.repl);
|
|
|
|
if (ret < 0)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
for (i = 0; i < ARRAY_SIZE(arpt_ops); i++)
|
|
|
|
if ((ret = nf_register_hook(&arpt_ops[i])) < 0)
|
|
|
|
goto cleanup_hooks;
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
cleanup_hooks:
|
|
|
|
while (--i >= 0)
|
|
|
|
nf_unregister_hook(&arpt_ops[i]);
|
|
|
|
|
|
|
|
arpt_unregister_table(&packet_filter);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2006-03-29 00:37:06 +00:00
|
|
|
static void __exit arptable_filter_fini(void)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
unsigned int i;
|
|
|
|
|
|
|
|
for (i = 0; i < ARRAY_SIZE(arpt_ops); i++)
|
|
|
|
nf_unregister_hook(&arpt_ops[i]);
|
|
|
|
|
|
|
|
arpt_unregister_table(&packet_filter);
|
|
|
|
}
|
|
|
|
|
2006-03-29 00:37:06 +00:00
|
|
|
module_init(arptable_filter_init);
|
|
|
|
module_exit(arptable_filter_fini);
|