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1 | /* (C) 1999-2001 Michal Ludvig <michal@logix.cz> | |
2 | * | |
3 | * This program is free software; you can redistribute it and/or modify | |
4 | * it under the terms of the GNU General Public License version 2 as | |
5 | * published by the Free Software Foundation. | |
6 | */ | |
7 | ||
8 | #include <linux/module.h> | |
9 | #include <linux/skbuff.h> | |
10 | #include <linux/if_ether.h> | |
11 | #include <linux/if_packet.h> | |
12 | #include <linux/in.h> | |
13 | #include <linux/ip.h> | |
14 | #include <linux/ipv6.h> | |
15 | ||
16 | #include <linux/netfilter/xt_pkttype.h> | |
17 | #include <linux/netfilter/x_tables.h> | |
18 | ||
19 | MODULE_LICENSE("GPL"); | |
20 | MODULE_AUTHOR("Michal Ludvig <michal@logix.cz>"); | |
21 | MODULE_DESCRIPTION("Xtables: link layer packet type match"); | |
22 | MODULE_ALIAS("ipt_pkttype"); | |
23 | MODULE_ALIAS("ip6t_pkttype"); | |
24 | ||
25 | static bool | |
26 | pkttype_mt(const struct sk_buff *skb, struct xt_action_param *par) | |
27 | { | |
28 | const struct xt_pkttype_info *info = par->matchinfo; | |
29 | u_int8_t type; | |
30 | ||
31 | if (skb->pkt_type != PACKET_LOOPBACK) | |
32 | type = skb->pkt_type; | |
33 | else if (par->family == NFPROTO_IPV4 && | |
34 | ipv4_is_multicast(ip_hdr(skb)->daddr)) | |
35 | type = PACKET_MULTICAST; | |
36 | else if (par->family == NFPROTO_IPV6 && | |
37 | ipv6_hdr(skb)->daddr.s6_addr[0] == 0xFF) | |
38 | type = PACKET_MULTICAST; | |
39 | else | |
40 | type = PACKET_BROADCAST; | |
41 | ||
42 | return (type == info->pkttype) ^ info->invert; | |
43 | } | |
44 | ||
45 | static struct xt_match pkttype_mt_reg __read_mostly = { | |
46 | .name = "pkttype", | |
47 | .revision = 0, | |
48 | .family = NFPROTO_UNSPEC, | |
49 | .match = pkttype_mt, | |
50 | .matchsize = sizeof(struct xt_pkttype_info), | |
51 | .me = THIS_MODULE, | |
52 | }; | |
53 | ||
54 | static int __init pkttype_mt_init(void) | |
55 | { | |
56 | return xt_register_match(&pkttype_mt_reg); | |
57 | } | |
58 | ||
59 | static void __exit pkttype_mt_exit(void) | |
60 | { | |
61 | xt_unregister_match(&pkttype_mt_reg); | |
62 | } | |
63 | ||
64 | module_init(pkttype_mt_init); | |
65 | module_exit(pkttype_mt_exit); |