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Linux/net/netfilter/xt_pkttype.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /* (C) 1999-2001 Michal Ludvig <michal@logix.cz>
  3  */
  4 
  5 #include <linux/module.h>
  6 #include <linux/skbuff.h>
  7 #include <linux/if_ether.h>
  8 #include <linux/if_packet.h>
  9 #include <linux/in.h>
 10 #include <linux/ip.h>
 11 #include <linux/ipv6.h>
 12 
 13 #include <linux/netfilter/xt_pkttype.h>
 14 #include <linux/netfilter/x_tables.h>
 15 
 16 MODULE_LICENSE("GPL");
 17 MODULE_AUTHOR("Michal Ludvig <michal@logix.cz>");
 18 MODULE_DESCRIPTION("Xtables: link layer packet type match");
 19 MODULE_ALIAS("ipt_pkttype");
 20 MODULE_ALIAS("ip6t_pkttype");
 21 
 22 static bool
 23 pkttype_mt(const struct sk_buff *skb, struct xt_action_param *par)
 24 {
 25         const struct xt_pkttype_info *info = par->matchinfo;
 26         u_int8_t type;
 27 
 28         if (skb->pkt_type != PACKET_LOOPBACK)
 29                 type = skb->pkt_type;
 30         else if (xt_family(par) == NFPROTO_IPV4 &&
 31             ipv4_is_multicast(ip_hdr(skb)->daddr))
 32                 type = PACKET_MULTICAST;
 33         else if (xt_family(par) == NFPROTO_IPV6)
 34                 type = PACKET_MULTICAST;
 35         else
 36                 type = PACKET_BROADCAST;
 37 
 38         return (type == info->pkttype) ^ info->invert;
 39 }
 40 
 41 static struct xt_match pkttype_mt_reg __read_mostly = {
 42         .name      = "pkttype",
 43         .revision  = 0,
 44         .family    = NFPROTO_UNSPEC,
 45         .match     = pkttype_mt,
 46         .matchsize = sizeof(struct xt_pkttype_info),
 47         .me        = THIS_MODULE,
 48 };
 49 
 50 static int __init pkttype_mt_init(void)
 51 {
 52         return xt_register_match(&pkttype_mt_reg);
 53 }
 54 
 55 static void __exit pkttype_mt_exit(void)
 56 {
 57         xt_unregister_match(&pkttype_mt_reg);
 58 }
 59 
 60 module_init(pkttype_mt_init);
 61 module_exit(pkttype_mt_exit);
 62 

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