Commit | Line | Data |
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1da177e4 LT |
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> | |
28658c89 PO |
12 | #include <linux/in.h> |
13 | #include <linux/ip.h> | |
57de0abb | 14 | #include <linux/ipv6.h> |
1da177e4 | 15 | |
2e4e6a17 HW |
16 | #include <linux/netfilter/xt_pkttype.h> |
17 | #include <linux/netfilter/x_tables.h> | |
1da177e4 LT |
18 | |
19 | MODULE_LICENSE("GPL"); | |
20 | MODULE_AUTHOR("Michal Ludvig <michal@logix.cz>"); | |
2ae15b64 | 21 | MODULE_DESCRIPTION("Xtables: link layer packet type match"); |
2e4e6a17 HW |
22 | MODULE_ALIAS("ipt_pkttype"); |
23 | MODULE_ALIAS("ip6t_pkttype"); | |
1da177e4 | 24 | |
d3c5ee6d | 25 | static bool |
f7108a20 | 26 | pkttype_mt(const struct sk_buff *skb, const struct xt_match_param *par) |
1da177e4 | 27 | { |
f7108a20 | 28 | const struct xt_pkttype_info *info = par->matchinfo; |
57de0abb | 29 | u_int8_t type; |
1da177e4 | 30 | |
57de0abb | 31 | if (skb->pkt_type != PACKET_LOOPBACK) |
28658c89 | 32 | type = skb->pkt_type; |
f7108a20 | 33 | else if (par->match->family == NFPROTO_IPV4 && |
57de0abb JE |
34 | ipv4_is_multicast(ip_hdr(skb)->daddr)) |
35 | type = PACKET_MULTICAST; | |
f7108a20 | 36 | else if (par->match->family == NFPROTO_IPV6 && |
57de0abb JE |
37 | ipv6_hdr(skb)->daddr.s6_addr[0] == 0xFF) |
38 | type = PACKET_MULTICAST; | |
39 | else | |
40 | type = PACKET_BROADCAST; | |
28658c89 PO |
41 | |
42 | return (type == info->pkttype) ^ info->invert; | |
1da177e4 LT |
43 | } |
44 | ||
d3c5ee6d | 45 | static struct xt_match pkttype_mt_reg[] __read_mostly = { |
4470bbc7 PM |
46 | { |
47 | .name = "pkttype", | |
ee999d8b | 48 | .family = NFPROTO_IPV4, |
d3c5ee6d | 49 | .match = pkttype_mt, |
4470bbc7 PM |
50 | .matchsize = sizeof(struct xt_pkttype_info), |
51 | .me = THIS_MODULE, | |
52 | }, | |
53 | { | |
54 | .name = "pkttype", | |
ee999d8b | 55 | .family = NFPROTO_IPV6, |
d3c5ee6d | 56 | .match = pkttype_mt, |
4470bbc7 PM |
57 | .matchsize = sizeof(struct xt_pkttype_info), |
58 | .me = THIS_MODULE, | |
59 | }, | |
2e4e6a17 HW |
60 | }; |
61 | ||
d3c5ee6d | 62 | static int __init pkttype_mt_init(void) |
1da177e4 | 63 | { |
d3c5ee6d | 64 | return xt_register_matches(pkttype_mt_reg, ARRAY_SIZE(pkttype_mt_reg)); |
1da177e4 LT |
65 | } |
66 | ||
d3c5ee6d | 67 | static void __exit pkttype_mt_exit(void) |
1da177e4 | 68 | { |
d3c5ee6d | 69 | xt_unregister_matches(pkttype_mt_reg, ARRAY_SIZE(pkttype_mt_reg)); |
1da177e4 LT |
70 | } |
71 | ||
d3c5ee6d JE |
72 | module_init(pkttype_mt_init); |
73 | module_exit(pkttype_mt_exit); |