projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
| 1da177e4 | 2 | /* |
| 211ed865 | 3 | * NET3: Support for 802.2 demultiplexing off Ethernet |
| 1da177e4 LT |
4 | * |
| 5 | * Demultiplex 802.2 encoded protocols. We match the entry by the | |
| 6 | * SSAP/DSAP pair and then deliver to the registered datalink that | |
| 7 | * matches. The control byte is ignored and handling of such items | |
| 8 | * is up to the routine passed the frame. | |
| 9 | * | |
| 10 | * Unlike the 802.3 datalink we have a list of 802.2 entries as | |
| 11 | * there are multiple protocols to demux. The list is currently | |
| 12 | * short (3 or 4 entries at most). The current demux assumes this. | |
| 13 | */ | |
| 14 | #include <linux/module.h> | |
| 15 | #include <linux/netdevice.h> | |
| 16 | #include <linux/skbuff.h> | |
| 5a0e3ad6 | 17 | #include <linux/slab.h> |
| 1da177e4 LT |
18 | #include <net/datalink.h> |
| 19 | #include <linux/mm.h> | |
| 20 | #include <linux/in.h> | |
| 21 | #include <linux/init.h> | |
| 22 | #include <net/llc.h> | |
| 23 | #include <net/p8022.h> | |
| 24 | ||
| 25 | static int p8022_request(struct datalink_proto *dl, struct sk_buff *skb, | |
| 2ef6db76 | 26 | const unsigned char *dest) |
| 1da177e4 LT |
27 | { |
| 28 | llc_build_and_send_ui_pkt(dl->sap, skb, dest, dl->sap->laddr.lsap); | |
| 29 | return 0; | |
| 30 | } | |
| 31 | ||
| 32 | struct datalink_proto *register_8022_client(unsigned char type, | |
| 33 | int (*func)(struct sk_buff *skb, | |
| 34 | struct net_device *dev, | |
| f2ccd8fa DM |
35 | struct packet_type *pt, |
| 36 | struct net_device *orig_dev)) | |
| 1da177e4 LT |
37 | { |
| 38 | struct datalink_proto *proto; | |
| 39 | ||
| 40 | proto = kmalloc(sizeof(*proto), GFP_ATOMIC); | |
| 41 | if (proto) { | |
| 42 | proto->type[0] = type; | |
| 43 | proto->header_length = 3; | |
| 44 | proto->request = p8022_request; | |
| 45 | proto->sap = llc_sap_open(type, func); | |
| 46 | if (!proto->sap) { | |
| 47 | kfree(proto); | |
| 48 | proto = NULL; | |
| 49 | } | |
| 50 | } | |
| 51 | return proto; | |
| 52 | } | |
| 53 | ||
| 54 | void unregister_8022_client(struct datalink_proto *proto) | |
| 55 | { | |
| 6e2144b7 | 56 | llc_sap_put(proto->sap); |
| 1da177e4 LT |
57 | kfree(proto); |
| 58 | } | |
| 59 | ||
| 60 | EXPORT_SYMBOL(register_8022_client); | |
| 61 | EXPORT_SYMBOL(unregister_8022_client); | |
| 62 | ||
| 63 | MODULE_LICENSE("GPL"); |