Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 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> |
Phil Oester | 28658c8 | 2006-07-24 22:54:14 -0700 | [diff] [blame] | 12 | #include <linux/in.h> |
| 13 | #include <linux/ip.h> |
Jan Engelhardt | 57de0ab | 2008-01-14 23:41:50 -0800 | [diff] [blame] | 14 | #include <linux/ipv6.h> |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 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>"); |
Jan Engelhardt | 2ae15b6 | 2008-01-14 23:42:28 -0800 | [diff] [blame] | 21 | MODULE_DESCRIPTION("Xtables: link layer packet type match"); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 22 | MODULE_ALIAS("ipt_pkttype"); |
| 23 | MODULE_ALIAS("ip6t_pkttype"); |
| 24 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 25 | static bool |
Jan Engelhardt | f7108a2 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 26 | pkttype_mt(const struct sk_buff *skb, const struct xt_match_param *par) |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 27 | { |
Jan Engelhardt | f7108a2 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 28 | const struct xt_pkttype_info *info = par->matchinfo; |
Jan Engelhardt | 57de0ab | 2008-01-14 23:41:50 -0800 | [diff] [blame] | 29 | u_int8_t type; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 30 | |
Jan Engelhardt | 57de0ab | 2008-01-14 23:41:50 -0800 | [diff] [blame] | 31 | if (skb->pkt_type != PACKET_LOOPBACK) |
Phil Oester | 28658c8 | 2006-07-24 22:54:14 -0700 | [diff] [blame] | 32 | type = skb->pkt_type; |
Jan Engelhardt | 92f3b2b | 2008-10-08 11:35:20 +0200 | [diff] [blame^] | 33 | else if (par->family == NFPROTO_IPV4 && |
Jan Engelhardt | 57de0ab | 2008-01-14 23:41:50 -0800 | [diff] [blame] | 34 | ipv4_is_multicast(ip_hdr(skb)->daddr)) |
| 35 | type = PACKET_MULTICAST; |
Jan Engelhardt | 92f3b2b | 2008-10-08 11:35:20 +0200 | [diff] [blame^] | 36 | else if (par->family == NFPROTO_IPV6 && |
Jan Engelhardt | 57de0ab | 2008-01-14 23:41:50 -0800 | [diff] [blame] | 37 | ipv6_hdr(skb)->daddr.s6_addr[0] == 0xFF) |
| 38 | type = PACKET_MULTICAST; |
| 39 | else |
| 40 | type = PACKET_BROADCAST; |
Phil Oester | 28658c8 | 2006-07-24 22:54:14 -0700 | [diff] [blame] | 41 | |
| 42 | return (type == info->pkttype) ^ info->invert; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 43 | } |
| 44 | |
Jan Engelhardt | 92f3b2b | 2008-10-08 11:35:20 +0200 | [diff] [blame^] | 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, |
Patrick McHardy | 5d04bff | 2006-03-20 18:01:58 -0800 | [diff] [blame] | 52 | }; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 53 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 54 | static int __init pkttype_mt_init(void) |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 55 | { |
Jan Engelhardt | 92f3b2b | 2008-10-08 11:35:20 +0200 | [diff] [blame^] | 56 | return xt_register_match(&pkttype_mt_reg); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 57 | } |
| 58 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 59 | static void __exit pkttype_mt_exit(void) |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 60 | { |
Jan Engelhardt | 92f3b2b | 2008-10-08 11:35:20 +0200 | [diff] [blame^] | 61 | xt_unregister_match(&pkttype_mt_reg); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 62 | } |
| 63 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 64 | module_init(pkttype_mt_init); |
| 65 | module_exit(pkttype_mt_exit); |