5 * Chris Vitale csv@bluetail.com
10 #include <linux/module.h>
11 #include <linux/netfilter/x_tables.h>
12 #include <linux/netfilter_bridge/ebtables.h>
13 #include <linux/netfilter_bridge/ebt_802_3.h>
16 ebt_802_3_mt(const struct sk_buff *skb, const struct xt_match_param *par)
18 const struct ebt_802_3_info *info = par->matchinfo;
19 const struct ebt_802_3_hdr *hdr = ebt_802_3_hdr(skb);
20 __be16 type = hdr->llc.ui.ctrl & IS_UI ? hdr->llc.ui.type : hdr->llc.ni.type;
22 if (info->bitmask & EBT_802_3_SAP) {
23 if (FWINV(info->sap != hdr->llc.ui.ssap, EBT_802_3_SAP))
25 if (FWINV(info->sap != hdr->llc.ui.dsap, EBT_802_3_SAP))
29 if (info->bitmask & EBT_802_3_TYPE) {
30 if (!(hdr->llc.ui.dsap == CHECK_TYPE && hdr->llc.ui.ssap == CHECK_TYPE))
32 if (FWINV(info->type != type, EBT_802_3_TYPE))
40 ebt_802_3_mt_check(const char *table, const void *entry,
41 const struct xt_match *match, void *data,
42 unsigned int hook_mask)
44 const struct ebt_802_3_info *info = data;
46 if (info->bitmask & ~EBT_802_3_MASK || info->invflags & ~EBT_802_3_MASK)
52 static struct xt_match ebt_802_3_mt_reg __read_mostly = {
55 .family = NFPROTO_BRIDGE,
56 .match = ebt_802_3_mt,
57 .checkentry = ebt_802_3_mt_check,
58 .matchsize = XT_ALIGN(sizeof(struct ebt_802_3_info)),
62 static int __init ebt_802_3_init(void)
64 return xt_register_match(&ebt_802_3_mt_reg);
67 static void __exit ebt_802_3_fini(void)
69 xt_unregister_match(&ebt_802_3_mt_reg);
72 module_init(ebt_802_3_init);
73 module_exit(ebt_802_3_fini);
74 MODULE_DESCRIPTION("Ebtables: DSAP/SSAP field and SNAP type matching");
75 MODULE_LICENSE("GPL");