blob: 69da1d3a1d85974a66c13c060078aa205a610963 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
|
/* (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, const struct xt_match_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);
|
