123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172 |
- /*
- * 802_3
- *
- * Author:
- * 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>
- static bool
- ebt_802_3_mt(const struct sk_buff *skb, struct xt_action_param *par)
- {
- const struct ebt_802_3_info *info = par->matchinfo;
- 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))
- return false;
- if (FWINV(info->sap != hdr->llc.ui.dsap, EBT_802_3_SAP))
- return false;
- }
- if (info->bitmask & EBT_802_3_TYPE) {
- if (!(hdr->llc.ui.dsap == CHECK_TYPE && hdr->llc.ui.ssap == CHECK_TYPE))
- return false;
- if (FWINV(info->type != type, EBT_802_3_TYPE))
- return false;
- }
- return true;
- }
- static int ebt_802_3_mt_check(const struct xt_mtchk_param *par)
- {
- const struct ebt_802_3_info *info = par->matchinfo;
- if (info->bitmask & ~EBT_802_3_MASK || info->invflags & ~EBT_802_3_MASK)
- return -EINVAL;
- return 0;
- }
- static struct xt_match ebt_802_3_mt_reg __read_mostly = {
- .name = "802_3",
- .revision = 0,
- .family = NFPROTO_BRIDGE,
- .match = ebt_802_3_mt,
- .checkentry = ebt_802_3_mt_check,
- .matchsize = sizeof(struct ebt_802_3_info),
- .me = THIS_MODULE,
- };
- static int __init ebt_802_3_init(void)
- {
- return xt_register_match(&ebt_802_3_mt_reg);
- }
- static void __exit ebt_802_3_fini(void)
- {
- xt_unregister_match(&ebt_802_3_mt_reg);
- }
- 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");
|