Commit | Line | Data |
---|---|---|
d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 | 2 | /* (C) 1999-2001 Michal Ludvig <michal@logix.cz> |
1da177e4 LT |
3 | */ |
4 | ||
5 | #include <linux/module.h> | |
6 | #include <linux/skbuff.h> | |
7 | #include <linux/if_ether.h> | |
8 | #include <linux/if_packet.h> | |
28658c89 PO |
9 | #include <linux/in.h> |
10 | #include <linux/ip.h> | |
57de0abb | 11 | #include <linux/ipv6.h> |
1da177e4 | 12 | |
2e4e6a17 HW |
13 | #include <linux/netfilter/xt_pkttype.h> |
14 | #include <linux/netfilter/x_tables.h> | |
1da177e4 LT |
15 | |
16 | MODULE_LICENSE("GPL"); | |
17 | MODULE_AUTHOR("Michal Ludvig <michal@logix.cz>"); | |
2ae15b64 | 18 | MODULE_DESCRIPTION("Xtables: link layer packet type match"); |
2e4e6a17 HW |
19 | MODULE_ALIAS("ipt_pkttype"); |
20 | MODULE_ALIAS("ip6t_pkttype"); | |
1da177e4 | 21 | |
d3c5ee6d | 22 | static bool |
62fc8051 | 23 | pkttype_mt(const struct sk_buff *skb, struct xt_action_param *par) |
1da177e4 | 24 | { |
f7108a20 | 25 | const struct xt_pkttype_info *info = par->matchinfo; |
57de0abb | 26 | u_int8_t type; |
1da177e4 | 27 | |
57de0abb | 28 | if (skb->pkt_type != PACKET_LOOPBACK) |
28658c89 | 29 | type = skb->pkt_type; |
613dbd95 | 30 | else if (xt_family(par) == NFPROTO_IPV4 && |
57de0abb JE |
31 | ipv4_is_multicast(ip_hdr(skb)->daddr)) |
32 | type = PACKET_MULTICAST; | |
9a6d8762 | 33 | else if (xt_family(par) == NFPROTO_IPV6) |
57de0abb JE |
34 | type = PACKET_MULTICAST; |
35 | else | |
36 | type = PACKET_BROADCAST; | |
28658c89 PO |
37 | |
38 | return (type == info->pkttype) ^ info->invert; | |
1da177e4 LT |
39 | } |
40 | ||
92f3b2b1 JE |
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, | |
2e4e6a17 HW |
48 | }; |
49 | ||
d3c5ee6d | 50 | static int __init pkttype_mt_init(void) |
1da177e4 | 51 | { |
92f3b2b1 | 52 | return xt_register_match(&pkttype_mt_reg); |
1da177e4 LT |
53 | } |
54 | ||
d3c5ee6d | 55 | static void __exit pkttype_mt_exit(void) |
1da177e4 | 56 | { |
92f3b2b1 | 57 | xt_unregister_match(&pkttype_mt_reg); |
1da177e4 LT |
58 | } |
59 | ||
d3c5ee6d JE |
60 | module_init(pkttype_mt_init); |
61 | module_exit(pkttype_mt_exit); |