| /* |
| * 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 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) |
| { |
| 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)) |
| 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)) |
| return EBT_NOMATCH; |
| } |
| |
| return EBT_MATCH; |
| } |
| |
| static struct ebt_match filter_802_3; |
| static int ebt_802_3_check(const char *tablename, unsigned int hookmask, |
| const struct ebt_entry *e, void *data, unsigned int datalen) |
| { |
| const struct ebt_802_3_info *info = data; |
| |
| if (info->bitmask & ~EBT_802_3_MASK || info->invflags & ~EBT_802_3_MASK) |
| return -EINVAL; |
| |
| return 0; |
| } |
| |
| 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, |
| }; |
| |
| static int __init ebt_802_3_init(void) |
| { |
| return ebt_register_match(&filter_802_3); |
| } |
| |
| static void __exit ebt_802_3_fini(void) |
| { |
| ebt_unregister_match(&filter_802_3); |
| } |
| |
| 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"); |