| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * NET3: Support for 802.2 demultiplexing off Ethernet (Token ring |
| 3 | * is kept separate see p8022tr.c) |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation; either version |
| 7 | * 2 of the License, or (at your option) any later version. |
| 8 | * |
| 9 | * Demultiplex 802.2 encoded protocols. We match the entry by the |
| 10 | * SSAP/DSAP pair and then deliver to the registered datalink that |
| 11 | * matches. The control byte is ignored and handling of such items |
| 12 | * is up to the routine passed the frame. |
| 13 | * |
| 14 | * Unlike the 802.3 datalink we have a list of 802.2 entries as |
| 15 | * there are multiple protocols to demux. The list is currently |
| 16 | * short (3 or 4 entries at most). The current demux assumes this. |
| 17 | */ |
| 18 | #include <linux/module.h> |
| 19 | #include <linux/netdevice.h> |
| 20 | #include <linux/skbuff.h> |
| 21 | #include <net/datalink.h> |
| 22 | #include <linux/mm.h> |
| 23 | #include <linux/in.h> |
| 24 | #include <linux/init.h> |
| 25 | #include <net/llc.h> |
| 26 | #include <net/p8022.h> |
| 27 | |
| 28 | static int p8022_request(struct datalink_proto *dl, struct sk_buff *skb, |
| 29 | unsigned char *dest) |
| 30 | { |
| 31 | llc_build_and_send_ui_pkt(dl->sap, skb, dest, dl->sap->laddr.lsap); |
| 32 | return 0; |
| 33 | } |
| 34 | |
| 35 | struct datalink_proto *register_8022_client(unsigned char type, |
| 36 | int (*func)(struct sk_buff *skb, |
| 37 | struct net_device *dev, |
| 38 | struct packet_type *pt)) |
| 39 | { |
| 40 | struct datalink_proto *proto; |
| 41 | |
| 42 | proto = kmalloc(sizeof(*proto), GFP_ATOMIC); |
| 43 | if (proto) { |
| 44 | proto->type[0] = type; |
| 45 | proto->header_length = 3; |
| 46 | proto->request = p8022_request; |
| 47 | proto->sap = llc_sap_open(type, func); |
| 48 | if (!proto->sap) { |
| 49 | kfree(proto); |
| 50 | proto = NULL; |
| 51 | } |
| 52 | } |
| 53 | return proto; |
| 54 | } |
| 55 | |
| 56 | void unregister_8022_client(struct datalink_proto *proto) |
| 57 | { |
| 58 | llc_sap_close(proto->sap); |
| 59 | kfree(proto); |
| 60 | } |
| 61 | |
| 62 | EXPORT_SYMBOL(register_8022_client); |
| 63 | EXPORT_SYMBOL(unregister_8022_client); |
| 64 | |
| 65 | MODULE_LICENSE("GPL"); |