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Linux/net/netfilter/xt_pkttype.c

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  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>
 12 #include <linux/in.h>
 13 #include <linux/ip.h>
 14 #include <linux/ipv6.h>
 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>");
 21 MODULE_DESCRIPTION("Xtables: link layer packet type match");
 22 MODULE_ALIAS("ipt_pkttype");
 23 MODULE_ALIAS("ip6t_pkttype");
 24 
 25 static bool
 26 pkttype_mt(const struct sk_buff *skb, struct xt_action_param *par)
 27 {
 28         const struct xt_pkttype_info *info = par->matchinfo;
 29         u_int8_t type;
 30 
 31         if (skb->pkt_type != PACKET_LOOPBACK)
 32                 type = skb->pkt_type;
 33         else if (par->family == NFPROTO_IPV4 &&
 34             ipv4_is_multicast(ip_hdr(skb)->daddr))
 35                 type = PACKET_MULTICAST;
 36         else if (par->family == NFPROTO_IPV6 &&
 37             ipv6_hdr(skb)->daddr.s6_addr[0] == 0xFF)
 38                 type = PACKET_MULTICAST;
 39         else
 40                 type = PACKET_BROADCAST;
 41 
 42         return (type == info->pkttype) ^ info->invert;
 43 }
 44 
 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,
 52 };
 53 
 54 static int __init pkttype_mt_init(void)
 55 {
 56         return xt_register_match(&pkttype_mt_reg);
 57 }
 58 
 59 static void __exit pkttype_mt_exit(void)
 60 {
 61         xt_unregister_match(&pkttype_mt_reg);
 62 }
 63 
 64 module_init(pkttype_mt_init);
 65 module_exit(pkttype_mt_exit);
 66 

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