62fc805108
In future, layer-3 matches will be an xt module of their own, and need to set the fragoff and thoff fields. Adding more pointers would needlessy increase memory requirements (esp. so for 64-bit, where pointers are wider). Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
66 lines
1.6 KiB
C
66 lines
1.6 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/ipv6.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("Xtables: link layer packet type match");
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MODULE_ALIAS("ipt_pkttype");
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MODULE_ALIAS("ip6t_pkttype");
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static bool
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pkttype_mt(const struct sk_buff *skb, struct xt_action_param *par)
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{
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const struct xt_pkttype_info *info = par->matchinfo;
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u_int8_t type;
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if (skb->pkt_type != PACKET_LOOPBACK)
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type = skb->pkt_type;
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else if (par->family == NFPROTO_IPV4 &&
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ipv4_is_multicast(ip_hdr(skb)->daddr))
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type = PACKET_MULTICAST;
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else if (par->family == NFPROTO_IPV6 &&
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ipv6_hdr(skb)->daddr.s6_addr[0] == 0xFF)
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type = PACKET_MULTICAST;
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else
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type = PACKET_BROADCAST;
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return (type == info->pkttype) ^ info->invert;
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}
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static struct xt_match pkttype_mt_reg __read_mostly = {
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.name = "pkttype",
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.revision = 0,
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.family = NFPROTO_UNSPEC,
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.match = pkttype_mt,
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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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static int __init pkttype_mt_init(void)
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{
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return xt_register_match(&pkttype_mt_reg);
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}
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static void __exit pkttype_mt_exit(void)
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{
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xt_unregister_match(&pkttype_mt_reg);
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}
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module_init(pkttype_mt_init);
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module_exit(pkttype_mt_exit);
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