projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 JE |
25 | static bool |
| 26 | pkttype_mt(const struct sk_buff *skb, const struct net_device *in, | |
| 27 | const struct net_device *out, const struct xt_match *match, | |
| 28 | const void *matchinfo, int offset, unsigned int protoff, | |
| 29 | bool *hotdrop) | |
| 1da177e4 | 30 | { |
| 2e4e6a17 | 31 | const struct xt_pkttype_info *info = matchinfo; |
| 57de0abb | 32 | u_int8_t type; |
| 1da177e4 | 33 | |
| 57de0abb | 34 | if (skb->pkt_type != PACKET_LOOPBACK) |
| 28658c89 | 35 | type = skb->pkt_type; |
| ee999d8b | 36 | else if (match->family == NFPROTO_IPV4 && |
| 57de0abb JE |
37 | ipv4_is_multicast(ip_hdr(skb)->daddr)) |
| 38 | type = PACKET_MULTICAST; | |
| ee999d8b | 39 | else if (match->family == NFPROTO_IPV6 && |
| 57de0abb JE |
40 | ipv6_hdr(skb)->daddr.s6_addr[0] == 0xFF) |
| 41 | type = PACKET_MULTICAST; | |
| 42 | else | |
| 43 | type = PACKET_BROADCAST; | |
| 28658c89 PO |
44 | |
| 45 | return (type == info->pkttype) ^ info->invert; | |
| 1da177e4 LT |
46 | } |
| 47 | ||
| d3c5ee6d | 48 | static struct xt_match pkttype_mt_reg[] __read_mostly = { |
| 4470bbc7 PM |
49 | { |
| 50 | .name = "pkttype", | |
| ee999d8b | 51 | .family = NFPROTO_IPV4, |
| d3c5ee6d | 52 | .match = pkttype_mt, |
| 4470bbc7 PM |
53 | .matchsize = sizeof(struct xt_pkttype_info), |
| 54 | .me = THIS_MODULE, | |
| 55 | }, | |
| 56 | { | |
| 57 | .name = "pkttype", | |
| ee999d8b | 58 | .family = NFPROTO_IPV6, |
| d3c5ee6d | 59 | .match = pkttype_mt, |
| 4470bbc7 PM |
60 | .matchsize = sizeof(struct xt_pkttype_info), |
| 61 | .me = THIS_MODULE, | |
| 62 | }, | |
| 2e4e6a17 HW |
63 | }; |
| 64 | ||
| d3c5ee6d | 65 | static int __init pkttype_mt_init(void) |
| 1da177e4 | 66 | { |
| d3c5ee6d | 67 | return xt_register_matches(pkttype_mt_reg, ARRAY_SIZE(pkttype_mt_reg)); |
| 1da177e4 LT |
68 | } |
| 69 | ||
| d3c5ee6d | 70 | static void __exit pkttype_mt_exit(void) |
| 1da177e4 | 71 | { |
| d3c5ee6d | 72 | xt_unregister_matches(pkttype_mt_reg, ARRAY_SIZE(pkttype_mt_reg)); |
| 1da177e4 LT |
73 | } |
| 74 | ||
| d3c5ee6d JE |
75 | module_init(pkttype_mt_init); |
| 76 | module_exit(pkttype_mt_exit); |