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63 lines
1.7 KiB
63 lines
1.7 KiB
// 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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