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 net_device *in,
17 const struct net_device *out, const struct xt_match *match,
18 const void *data, int offset, unsigned int protoff, bool *hotdrop)
20 const struct ebt_802_3_info *info = data;
21 const struct ebt_802_3_hdr *hdr = ebt_802_3_hdr(skb);
22 __be16 type = hdr->llc.ui.ctrl & IS_UI ? hdr->llc.ui.type : hdr->llc.ni.type;
24 if (info->bitmask & EBT_802_3_SAP) {
25 if (FWINV(info->sap != hdr->llc.ui.ssap, EBT_802_3_SAP))
27 if (FWINV(info->sap != hdr->llc.ui.dsap, EBT_802_3_SAP))
31 if (info->bitmask & EBT_802_3_TYPE) {
32 if (!(hdr->llc.ui.dsap == CHECK_TYPE && hdr->llc.ui.ssap == CHECK_TYPE))
34 if (FWINV(info->type != type, EBT_802_3_TYPE))
42 ebt_802_3_mt_check(const char *table, const void *entry,
43 const struct xt_match *match, void *data,
44 unsigned int hook_mask)
46 const struct ebt_802_3_info *info = data;
48 if (info->bitmask & ~EBT_802_3_MASK || info->invflags & ~EBT_802_3_MASK)
54 static struct xt_match ebt_802_3_mt_reg __read_mostly = {
57 .family = NFPROTO_BRIDGE,
58 .match = ebt_802_3_mt,
59 .checkentry = ebt_802_3_mt_check,
60 .matchsize = XT_ALIGN(sizeof(struct ebt_802_3_info)),
64 static int __init ebt_802_3_init(void)
66 return xt_register_match(&ebt_802_3_mt_reg);
69 static void __exit ebt_802_3_fini(void)
71 xt_unregister_match(&ebt_802_3_mt_reg);
74 module_init(ebt_802_3_init);
75 module_exit(ebt_802_3_fini);
76 MODULE_DESCRIPTION("Ebtables: DSAP/SSAP field and SNAP type matching");
77 MODULE_LICENSE("GPL");