#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("IP tables match to match on linklayer packet type");
+MODULE_DESCRIPTION("Xtables: link layer packet type match");
MODULE_ALIAS("ipt_pkttype");
MODULE_ALIAS("ip6t_pkttype");
-static int match(const struct sk_buff *skb,
- const struct net_device *in,
- const struct net_device *out,
- const void *matchinfo,
- int offset,
- unsigned int protoff,
- int *hotdrop)
+static bool
+pkttype_mt(const struct sk_buff *skb, const struct xt_match_param *par)
{
- const struct xt_pkttype_info *info = matchinfo;
+ const struct xt_pkttype_info *info = par->matchinfo;
+ u_int8_t type;
- return (skb->pkt_type == info->pkttype) ^ info->invert;
-}
-
-static int checkentry(const char *tablename,
- const void *ip,
- void *matchinfo,
- unsigned int matchsize,
- unsigned int hook_mask)
-{
- if (matchsize != XT_ALIGN(sizeof(struct xt_pkttype_info)))
- return 0;
+ if (skb->pkt_type != PACKET_LOOPBACK)
+ type = skb->pkt_type;
+ else if (par->family == NFPROTO_IPV4 &&
+ ipv4_is_multicast(ip_hdr(skb)->daddr))
+ type = PACKET_MULTICAST;
+ else if (par->family == NFPROTO_IPV6 &&
+ ipv6_hdr(skb)->daddr.s6_addr[0] == 0xFF)
+ type = PACKET_MULTICAST;
+ else
+ type = PACKET_BROADCAST;
- return 1;
+ return (type == info->pkttype) ^ info->invert;
}
-static struct xt_match pkttype_match = {
- .name = "pkttype",
- .match = &match,
- .checkentry = &checkentry,
- .me = THIS_MODULE,
-};
-static struct xt_match pkttype6_match = {
- .name = "pkttype",
- .match = &match,
- .checkentry = &checkentry,
- .me = THIS_MODULE,
+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 init(void)
+static int __init pkttype_mt_init(void)
{
- int ret;
- ret = xt_register_match(AF_INET, &pkttype_match);
- if (ret)
- return ret;
-
- ret = xt_register_match(AF_INET6, &pkttype6_match);
- if (ret)
- xt_unregister_match(AF_INET, &pkttype_match);
-
- return ret;
+ return xt_register_match(&pkttype_mt_reg);
}
-static void __exit fini(void)
+static void __exit pkttype_mt_exit(void)
{
- xt_unregister_match(AF_INET, &pkttype_match);
- xt_unregister_match(AF_INET6, &pkttype6_match);
+ xt_unregister_match(&pkttype_mt_reg);
}
-module_init(init);
-module_exit(fini);
+module_init(pkttype_mt_init);
+module_exit(pkttype_mt_exit);