1 // SPDX-License-Identifier: GPL-2.0-only
2 /* (C) 1999-2001 Michal Ludvig <michal@logix.cz>
5 #include <linux/module.h>
6 #include <linux/skbuff.h>
7 #include <linux/if_ether.h>
8 #include <linux/if_packet.h>
11 #include <linux/ipv6.h>
13 #include <linux/netfilter/xt_pkttype.h>
14 #include <linux/netfilter/x_tables.h>
16 MODULE_LICENSE("GPL");
17 MODULE_AUTHOR("Michal Ludvig <michal@logix.cz>");
18 MODULE_DESCRIPTION("Xtables: link layer packet type match");
19 MODULE_ALIAS("ipt_pkttype");
20 MODULE_ALIAS("ip6t_pkttype");
23 pkttype_mt(const struct sk_buff
*skb
, struct xt_action_param
*par
)
25 const struct xt_pkttype_info
*info
= par
->matchinfo
;
28 if (skb
->pkt_type
!= PACKET_LOOPBACK
)
30 else if (xt_family(par
) == NFPROTO_IPV4
&&
31 ipv4_is_multicast(ip_hdr(skb
)->daddr
))
32 type
= PACKET_MULTICAST
;
33 else if (xt_family(par
) == NFPROTO_IPV6
)
34 type
= PACKET_MULTICAST
;
36 type
= PACKET_BROADCAST
;
38 return (type
== info
->pkttype
) ^ info
->invert
;
41 static struct xt_match pkttype_mt_reg __read_mostly
= {
44 .family
= NFPROTO_UNSPEC
,
46 .matchsize
= sizeof(struct xt_pkttype_info
),
50 static int __init
pkttype_mt_init(void)
52 return xt_register_match(&pkttype_mt_reg
);
55 static void __exit
pkttype_mt_exit(void)
57 xt_unregister_match(&pkttype_mt_reg
);
60 module_init(pkttype_mt_init
);
61 module_exit(pkttype_mt_exit
);