1 files changed, 65 insertions, 0 deletions
diff --git a/net/802/p8022.c b/net/802/p8022.c
new file mode 100644
index 000000000000..5ae63416df6d
--- /dev/null
+++ b/net/802/p8022.c
@@ -0,0 +1,65 @@
+/*
+ *	NET3:	Support for 802.2 demultiplexing off Ethernet (Token ring
+ *		is kept separate see p8022tr.c)
+ *		This program is free software; you can redistribute it and/or
+ *		modify it under the terms of the GNU General Public License
+ *		as published by the Free Software Foundation; either version
+ *		2 of the License, or (at your option) any later version.
+ *
+ *		Demultiplex 802.2 encoded protocols. We match the entry by the
+ *		SSAP/DSAP pair and then deliver to the registered datalink that
+ *		matches. The control byte is ignored and handling of such items
+ *		is up to the routine passed the frame.
+ *
+ *		Unlike the 802.3 datalink we have a list of 802.2 entries as
+ *		there are multiple protocols to demux. The list is currently
+ *		short (3 or 4 entries at most). The current demux assumes this.
+ */
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <net/datalink.h>
+#include <linux/mm.h>
+#include <linux/in.h>
+#include <linux/init.h>
+#include <net/llc.h>
+#include <net/p8022.h>
+
+static int p8022_request(struct datalink_proto *dl, struct sk_buff *skb,
+			 unsigned char *dest)
+{
+	llc_build_and_send_ui_pkt(dl->sap, skb, dest, dl->sap->laddr.lsap);
+	return 0;
+}
+
+struct datalink_proto *register_8022_client(unsigned char type,
+					    int (*func)(struct sk_buff *skb,
+							struct net_device *dev,
+							struct packet_type *pt))
+{
+	struct datalink_proto *proto;
+
+	proto = kmalloc(sizeof(*proto), GFP_ATOMIC);
+	if (proto) {
+		proto->type[0]		= type;
+		proto->header_length	= 3;
+		proto->request		= p8022_request;
+		proto->sap = llc_sap_open(type, func);
+		if (!proto->sap) {
+			kfree(proto);
+			proto = NULL;
+		}
+	}
+	return proto;
+}
+
+void unregister_8022_client(struct datalink_proto *proto)
+{
+	llc_sap_close(proto->sap);
+	kfree(proto);
+}
+
+EXPORT_SYMBOL(register_8022_client);
+EXPORT_SYMBOL(unregister_8022_client);
+
+MODULE_LICENSE("GPL");