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