Add the rt linux 4.1.3-rt3 as base
[kvmfornfv.git] / kernel / net / bridge / netfilter / ebt_802_3.c
diff --git a/kernel/net/bridge/netfilter/ebt_802_3.c b/kernel/net/bridge/netfilter/ebt_802_3.c
new file mode 100644 (file)
index 0000000..2a449b7
--- /dev/null
@@ -0,0 +1,72 @@
+/*
+ * 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");