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2874c5fd28
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
64 lines
1.7 KiB
C
64 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* NET3: Support for 802.2 demultiplexing off Ethernet
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*
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* Demultiplex 802.2 encoded protocols. We match the entry by the
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* SSAP/DSAP pair and then deliver to the registered datalink that
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* matches. The control byte is ignored and handling of such items
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* is up to the routine passed the frame.
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*
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* Unlike the 802.3 datalink we have a list of 802.2 entries as
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* there are multiple protocols to demux. The list is currently
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* short (3 or 4 entries at most). The current demux assumes this.
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*/
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#include <linux/module.h>
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <linux/slab.h>
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#include <net/datalink.h>
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#include <linux/mm.h>
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#include <linux/in.h>
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#include <linux/init.h>
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#include <net/llc.h>
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#include <net/p8022.h>
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static int p8022_request(struct datalink_proto *dl, struct sk_buff *skb,
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unsigned char *dest)
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{
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llc_build_and_send_ui_pkt(dl->sap, skb, dest, dl->sap->laddr.lsap);
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return 0;
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}
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struct datalink_proto *register_8022_client(unsigned char type,
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int (*func)(struct sk_buff *skb,
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struct net_device *dev,
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struct packet_type *pt,
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struct net_device *orig_dev))
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{
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struct datalink_proto *proto;
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proto = kmalloc(sizeof(*proto), GFP_ATOMIC);
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if (proto) {
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proto->type[0] = type;
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proto->header_length = 3;
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proto->request = p8022_request;
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proto->sap = llc_sap_open(type, func);
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if (!proto->sap) {
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kfree(proto);
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proto = NULL;
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}
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}
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return proto;
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}
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void unregister_8022_client(struct datalink_proto *proto)
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{
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llc_sap_put(proto->sap);
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kfree(proto);
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}
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EXPORT_SYMBOL(register_8022_client);
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EXPORT_SYMBOL(unregister_8022_client);
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MODULE_LICENSE("GPL");
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