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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> | |
1da177e4 | 14 | |
2e4e6a17 HW |
15 | #include <linux/netfilter/xt_pkttype.h> |
16 | #include <linux/netfilter/x_tables.h> | |
1da177e4 LT |
17 | |
18 | MODULE_LICENSE("GPL"); | |
19 | MODULE_AUTHOR("Michal Ludvig <michal@logix.cz>"); | |
20 | MODULE_DESCRIPTION("IP tables match to match on linklayer packet type"); | |
2e4e6a17 HW |
21 | MODULE_ALIAS("ipt_pkttype"); |
22 | MODULE_ALIAS("ip6t_pkttype"); | |
1da177e4 | 23 | |
d3c5ee6d JE |
24 | static bool |
25 | pkttype_mt(const struct sk_buff *skb, const struct net_device *in, | |
26 | const struct net_device *out, const struct xt_match *match, | |
27 | const void *matchinfo, int offset, unsigned int protoff, | |
28 | bool *hotdrop) | |
1da177e4 | 29 | { |
28658c89 | 30 | u_int8_t type; |
2e4e6a17 | 31 | const struct xt_pkttype_info *info = matchinfo; |
1da177e4 | 32 | |
28658c89 | 33 | if (skb->pkt_type == PACKET_LOOPBACK) |
13b0e83b JE |
34 | type = match->family == AF_INET && |
35 | ipv4_is_multicast(ip_hdr(skb)->daddr) | |
28658c89 | 36 | ? PACKET_MULTICAST |
7c4e36bc | 37 | : PACKET_BROADCAST; |
28658c89 PO |
38 | else |
39 | type = skb->pkt_type; | |
40 | ||
41 | return (type == info->pkttype) ^ info->invert; | |
1da177e4 LT |
42 | } |
43 | ||
d3c5ee6d | 44 | static struct xt_match pkttype_mt_reg[] __read_mostly = { |
4470bbc7 PM |
45 | { |
46 | .name = "pkttype", | |
47 | .family = AF_INET, | |
d3c5ee6d | 48 | .match = pkttype_mt, |
4470bbc7 PM |
49 | .matchsize = sizeof(struct xt_pkttype_info), |
50 | .me = THIS_MODULE, | |
51 | }, | |
52 | { | |
53 | .name = "pkttype", | |
54 | .family = AF_INET6, | |
d3c5ee6d | 55 | .match = pkttype_mt, |
4470bbc7 PM |
56 | .matchsize = sizeof(struct xt_pkttype_info), |
57 | .me = THIS_MODULE, | |
58 | }, | |
2e4e6a17 HW |
59 | }; |
60 | ||
d3c5ee6d | 61 | static int __init pkttype_mt_init(void) |
1da177e4 | 62 | { |
d3c5ee6d | 63 | return xt_register_matches(pkttype_mt_reg, ARRAY_SIZE(pkttype_mt_reg)); |
1da177e4 LT |
64 | } |
65 | ||
d3c5ee6d | 66 | static void __exit pkttype_mt_exit(void) |
1da177e4 | 67 | { |
d3c5ee6d | 68 | xt_unregister_matches(pkttype_mt_reg, ARRAY_SIZE(pkttype_mt_reg)); |
1da177e4 LT |
69 | } |
70 | ||
d3c5ee6d JE |
71 | module_init(pkttype_mt_init); |
72 | module_exit(pkttype_mt_exit); |