| /* |
| * 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"); |