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authorBart De Schuymer <bdschuym@pandora.be>2003-05-12 17:23:01 +0000
committerBart De Schuymer <bdschuym@pandora.be>2003-05-12 17:23:01 +0000
commit8edbefd238780b093545a808d431d05ed70ac612 (patch)
treea2e06b0e5c6e1dcbf79cbec37e2ac91e5005a8bf /kernel/linux2.5/net/bridge/netfilter/ebt_802_3.c
parent77eba6b013afd582d9f2145008fc8fa5c31019d1 (diff)
Chris Vitale <csv_at_bluetail.com>
Diffstat (limited to 'kernel/linux2.5/net/bridge/netfilter/ebt_802_3.c')
-rw-r--r--kernel/linux2.5/net/bridge/netfilter/ebt_802_3.c74
1 files changed, 74 insertions, 0 deletions
diff --git a/kernel/linux2.5/net/bridge/netfilter/ebt_802_3.c b/kernel/linux2.5/net/bridge/netfilter/ebt_802_3.c
new file mode 100644
index 0000000..f4732da
--- /dev/null
+++ b/kernel/linux2.5/net/bridge/netfilter/ebt_802_3.c
@@ -0,0 +1,74 @@
+/*
+ * 802_3
+ *
+ * Author:
+ * Chris Vitale csv@bluetail.com
+ *
+ * May 2003
+ *
+ */
+
+#include <linux/netfilter_bridge/ebtables.h>
+#include <linux/netfilter_bridge/ebt_802_3.h>
+#include <linux/module.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)
+{
+ struct ebt_802_3_info *info = (struct ebt_802_3_info *)data;
+ struct ebt_802_3_hdr *hdr = (struct ebt_802_3_hdr *)skb->mac.ethernet;
+ uint16_t type = hdr->llc.ui.ctrl & 0x3 ? 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 == 0xaa && hdr->llc.ui.ssap == 0xaa))
+ return EBT_NOMATCH;
+ if (FWINV(info->type != type, EBT_802_3_TYPE))
+ return EBT_NOMATCH;
+ }
+
+ /* Other matches will go here, when I get around to it */
+
+ return EBT_MATCH;
+}
+
+static int ebt_802_3_check(const char *tablename, unsigned int hookmask,
+ const struct ebt_entry *e, void *data, unsigned int datalen)
+{
+ struct ebt_802_3_info *info = (struct ebt_802_3_info *)data;
+
+ if (datalen < sizeof(struct ebt_802_3_info))
+ return -EINVAL;
+ if (info->bitmask & ~EBT_802_3_MASK || info->invflags & ~EBT_802_3_MASK)
+ return -EINVAL;
+
+ return 0;
+}
+
+static struct ebt_match filter_802_3 =
+{
+ {NULL, NULL}, EBT_802_3_MATCH, ebt_filter_802_3, ebt_802_3_check, NULL,
+ THIS_MODULE
+};
+
+static int __init init(void)
+{
+ return ebt_register_match(&filter_802_3);
+}
+
+static void __exit fini(void)
+{
+ ebt_unregister_match(&filter_802_3);
+}
+
+module_init(init);
+module_exit(fini);
+MODULE_LICENSE("GPL");
+