| /* (C) 1999-2001 Michal Ludvig <michal@logix.cz> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/skbuff.h> |
| #include <linux/if_ether.h> |
| #include <linux/if_packet.h> |
| #include <linux/in.h> |
| #include <linux/ip.h> |
| |
| #include <linux/netfilter/xt_pkttype.h> |
| #include <linux/netfilter/x_tables.h> |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_AUTHOR("Michal Ludvig <michal@logix.cz>"); |
| MODULE_DESCRIPTION("IP tables match to match on linklayer packet type"); |
| MODULE_ALIAS("ipt_pkttype"); |
| MODULE_ALIAS("ip6t_pkttype"); |
| |
| static bool match(const struct sk_buff *skb, |
| const struct net_device *in, |
| const struct net_device *out, |
| const struct xt_match *match, |
| const void *matchinfo, |
| int offset, |
| unsigned int protoff, |
| bool *hotdrop) |
| { |
| u_int8_t type; |
| const struct xt_pkttype_info *info = matchinfo; |
| |
| if (skb->pkt_type == PACKET_LOOPBACK) |
| type = (MULTICAST(ip_hdr(skb)->daddr) |
| ? PACKET_MULTICAST |
| : PACKET_BROADCAST); |
| else |
| type = skb->pkt_type; |
| |
| return (type == info->pkttype) ^ info->invert; |
| } |
| |
| static struct xt_match xt_pkttype_match[] = { |
| { |
| .name = "pkttype", |
| .family = AF_INET, |
| .match = match, |
| .matchsize = sizeof(struct xt_pkttype_info), |
| .me = THIS_MODULE, |
| }, |
| { |
| .name = "pkttype", |
| .family = AF_INET6, |
| .match = match, |
| .matchsize = sizeof(struct xt_pkttype_info), |
| .me = THIS_MODULE, |
| }, |
| }; |
| |
| static int __init xt_pkttype_init(void) |
| { |
| return xt_register_matches(xt_pkttype_match, |
| ARRAY_SIZE(xt_pkttype_match)); |
| } |
| |
| static void __exit xt_pkttype_fini(void) |
| { |
| xt_unregister_matches(xt_pkttype_match, ARRAY_SIZE(xt_pkttype_match)); |
| } |
| |
| module_init(xt_pkttype_init); |
| module_exit(xt_pkttype_fini); |