| // SPDX-License-Identifier: GPL-2.0-only |
| /* (C) 1999-2001 Michal Ludvig <michal@logix.cz> |
| */ |
| |
| #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/ipv6.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("Xtables: link layer packet type match"); |
| MODULE_ALIAS("ipt_pkttype"); |
| MODULE_ALIAS("ip6t_pkttype"); |
| |
| static bool |
| pkttype_mt(const struct sk_buff *skb, struct xt_action_param *par) |
| { |
| const struct xt_pkttype_info *info = par->matchinfo; |
| u_int8_t type; |
| |
| if (skb->pkt_type != PACKET_LOOPBACK) |
| type = skb->pkt_type; |
| else if (xt_family(par) == NFPROTO_IPV4 && |
| ipv4_is_multicast(ip_hdr(skb)->daddr)) |
| type = PACKET_MULTICAST; |
| else if (xt_family(par) == NFPROTO_IPV6) |
| type = PACKET_MULTICAST; |
| else |
| type = PACKET_BROADCAST; |
| |
| return (type == info->pkttype) ^ info->invert; |
| } |
| |
| static struct xt_match pkttype_mt_reg __read_mostly = { |
| .name = "pkttype", |
| .revision = 0, |
| .family = NFPROTO_UNSPEC, |
| .match = pkttype_mt, |
| .matchsize = sizeof(struct xt_pkttype_info), |
| .me = THIS_MODULE, |
| }; |
| |
| static int __init pkttype_mt_init(void) |
| { |
| return xt_register_match(&pkttype_mt_reg); |
| } |
| |
| static void __exit pkttype_mt_exit(void) |
| { |
| xt_unregister_match(&pkttype_mt_reg); |
| } |
| |
| module_init(pkttype_mt_init); |
| module_exit(pkttype_mt_exit); |