* Chris Vitale csv@bluetail.com
*
* May 2003
- *
+ *
*/
-
+#include <linux/module.h>
+#include <linux/netfilter/x_tables.h>
#include <linux/netfilter_bridge/ebtables.h>
#include <linux/netfilter_bridge/ebt_802_3.h>
-#include <linux/module.h>
static int ebt_filter_802_3(const struct sk_buff *skb, const struct net_device *in,
const struct net_device *out, const void *data, unsigned int datalen)
{
- struct ebt_802_3_info *info = (struct ebt_802_3_info *)data;
- struct ebt_802_3_hdr *hdr = ebt_802_3_hdr(skb);
- uint16_t type = hdr->llc.ui.ctrl & IS_UI ? hdr->llc.ui.type : hdr->llc.ni.type;
+ const struct ebt_802_3_info *info = data;
+ const struct ebt_802_3_hdr *hdr = ebt_802_3_hdr(skb);
+ __be16 type = hdr->llc.ui.ctrl & IS_UI ? hdr->llc.ui.type : hdr->llc.ni.type;
if (info->bitmask & EBT_802_3_SAP) {
- if (FWINV(info->sap != hdr->llc.ui.ssap, EBT_802_3_SAP))
+ if (FWINV(info->sap != hdr->llc.ui.ssap, EBT_802_3_SAP))
return EBT_NOMATCH;
if (FWINV(info->sap != hdr->llc.ui.dsap, EBT_802_3_SAP))
return EBT_NOMATCH;
if (info->bitmask & EBT_802_3_TYPE) {
if (!(hdr->llc.ui.dsap == CHECK_TYPE && hdr->llc.ui.ssap == CHECK_TYPE))
return EBT_NOMATCH;
- if (FWINV(info->type != type, EBT_802_3_TYPE))
+ if (FWINV(info->type != type, EBT_802_3_TYPE))
return EBT_NOMATCH;
}
static int ebt_802_3_check(const char *tablename, unsigned int hookmask,
const struct ebt_entry *e, void *data, unsigned int datalen)
{
- struct ebt_802_3_info *info = (struct ebt_802_3_info *)data;
+ const struct ebt_802_3_info *info = data;
- if (datalen < sizeof(struct ebt_802_3_info))
- return -EINVAL;
if (info->bitmask & ~EBT_802_3_MASK || info->invflags & ~EBT_802_3_MASK)
return -EINVAL;
return 0;
}
-static struct ebt_match filter_802_3 =
-{
+static struct ebt_match filter_802_3 __read_mostly = {
.name = EBT_802_3_MATCH,
.match = ebt_filter_802_3,
.check = ebt_802_3_check,
+ .matchsize = XT_ALIGN(sizeof(struct ebt_802_3_info)),
.me = THIS_MODULE,
};
module_init(ebt_802_3_init);
module_exit(ebt_802_3_fini);
+MODULE_DESCRIPTION("Ebtables: DSAP/SSAP field and SNAP type matching");
MODULE_LICENSE("GPL");