1 // SPDX-License-Identifier: GPL-2.0-only
2 /* (C) 1999-2001 Michal Ludvig <michal@logix.cz>
3 */
4
5 #include <linux/module.h>
6 #include <linux/skbuff.h>
7 #include <linux/if_ether.h>
8 #include <linux/if_packet.h>
9 #include <linux/in.h>
10 #include <linux/ip.h>
11 #include <linux/ipv6.h>
12
13 #include <linux/netfilter/xt_pkttype.h>
14 #include <linux/netfilter/x_tables.h>
15
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");
21
22 static bool
23 pkttype_mt(const struct sk_buff *skb, struct xt_action_param *par)
24 {
25 const struct xt_pkttype_info *info = par->matchinfo;
26 u_int8_t type;
27
28 if (skb->pkt_type != PACKET_LOOPBACK)
29 type = skb->pkt_type;
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;
35 else
36 type = PACKET_BROADCAST;
37
38 return (type == info->pkttype) ^ info->invert;
39 }
40
41 static struct xt_match pkttype_mt_reg __read_mostly = {
42 .name = "pkttype",
43 .revision = 0,
44 .family = NFPROTO_UNSPEC,
45 .match = pkttype_mt,
46 .matchsize = sizeof(struct xt_pkttype_info),
47 .me = THIS_MODULE,
48 };
49
50 static int __init pkttype_mt_init(void)
51 {
52 return xt_register_match(&pkttype_mt_reg);
53 }
54
55 static void __exit pkttype_mt_exit(void)
56 {
57 xt_unregister_match(&pkttype_mt_reg);
58 }
59
60 module_init(pkttype_mt_init);
61 module_exit(pkttype_mt_exit);
62
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