mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 16:29:59 +00:00
![Jan Engelhardt](/assets/img/avatar_default.png)
In future, layer-3 matches will be an xt module of their own, and need to set the fragoff and thoff fields. Adding more pointers would needlessy increase memory requirements (esp. so for 64-bit, where pointers are wider). Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
65 lines
1.6 KiB
C
65 lines
1.6 KiB
C
/* (C) 1999-2001 Michal Ludvig <michal@logix.cz>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/if_ether.h>
|
|
#include <linux/if_packet.h>
|
|
#include <linux/in.h>
|
|
#include <linux/ip.h>
|
|
#include <linux/ipv6.h>
|
|
|
|
#include <linux/netfilter/xt_pkttype.h>
|
|
#include <linux/netfilter/x_tables.h>
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Michal Ludvig <michal@logix.cz>");
|
|
MODULE_DESCRIPTION("Xtables: link layer packet type match");
|
|
MODULE_ALIAS("ipt_pkttype");
|
|
MODULE_ALIAS("ip6t_pkttype");
|
|
|
|
static bool
|
|
pkttype_mt(const struct sk_buff *skb, struct xt_action_param *par)
|
|
{
|
|
const struct xt_pkttype_info *info = par->matchinfo;
|
|
u_int8_t type;
|
|
|
|
if (skb->pkt_type != PACKET_LOOPBACK)
|
|
type = skb->pkt_type;
|
|
else if (par->family == NFPROTO_IPV4 &&
|
|
ipv4_is_multicast(ip_hdr(skb)->daddr))
|
|
type = PACKET_MULTICAST;
|
|
else if (par->family == NFPROTO_IPV6 &&
|
|
ipv6_hdr(skb)->daddr.s6_addr[0] == 0xFF)
|
|
type = PACKET_MULTICAST;
|
|
else
|
|
type = PACKET_BROADCAST;
|
|
|
|
return (type == info->pkttype) ^ info->invert;
|
|
}
|
|
|
|
static struct xt_match pkttype_mt_reg __read_mostly = {
|
|
.name = "pkttype",
|
|
.revision = 0,
|
|
.family = NFPROTO_UNSPEC,
|
|
.match = pkttype_mt,
|
|
.matchsize = sizeof(struct xt_pkttype_info),
|
|
.me = THIS_MODULE,
|
|
};
|
|
|
|
static int __init pkttype_mt_init(void)
|
|
{
|
|
return xt_register_match(&pkttype_mt_reg);
|
|
}
|
|
|
|
static void __exit pkttype_mt_exit(void)
|
|
{
|
|
xt_unregister_match(&pkttype_mt_reg);
|
|
}
|
|
|
|
module_init(pkttype_mt_init);
|
|
module_exit(pkttype_mt_exit);
|