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");