blob: b658cba89fdd6fe97ded4b79d7fd9ae30459182d [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * llc_output.c - LLC minimal output path
3 *
4 * Copyright (c) 1997 by Procom Technology, Inc.
5 * 2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
6 *
7 * This program can be redistributed or modified under the terms of the
8 * GNU General Public License version 2 as published by the Free Software
9 * Foundation.
10 * This program is distributed without any warranty or implied warranty
11 * of merchantability or fitness for a particular purpose.
12 *
13 * See the GNU General Public License version 2 for more details.
14 */
15
16#include <linux/if_arp.h>
17#include <linux/if_tr.h>
18#include <linux/netdevice.h>
19#include <linux/trdevice.h>
20#include <linux/skbuff.h>
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040021#include <linux/export.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <net/llc.h>
23#include <net/llc_pdu.h>
24
25/**
26 * llc_mac_hdr_init - fills MAC header fields
27 * @skb: Address of the frame to initialize its MAC header
28 * @sa: The MAC source address
29 * @da: The MAC destination address
30 *
31 * Fills MAC header fields, depending on MAC type. Returns 0, If MAC type
32 * is a valid type and initialization completes correctly 1, otherwise.
33 */
Stephen Hemmingerf4ad2b12006-03-20 22:59:36 -080034int llc_mac_hdr_init(struct sk_buff *skb,
35 const unsigned char *sa, const unsigned char *da)
Linus Torvalds1da177e2005-04-16 15:20:36 -070036{
Octavian Purdilabf9ae532009-12-26 11:50:59 +000037 int rc = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
39 switch (skb->dev->type) {
Octavian Purdilabf9ae532009-12-26 11:50:59 +000040 case ARPHRD_IEEE802_TR:
Linus Torvalds1da177e2005-04-16 15:20:36 -070041 case ARPHRD_ETHER:
Octavian Purdilabf9ae532009-12-26 11:50:59 +000042 case ARPHRD_LOOPBACK:
43 rc = dev_hard_header(skb, skb->dev, ETH_P_802_2, da, sa,
44 skb->len);
45 if (rc > 0)
46 rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070047 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -070048 default:
Octavian Purdilabf9ae532009-12-26 11:50:59 +000049 WARN(1, "device type not supported: %d\n", skb->dev->type);
Linus Torvalds1da177e2005-04-16 15:20:36 -070050 }
51 return rc;
52}
53
54/**
55 * llc_build_and_send_ui_pkt - unitdata request interface for upper layers
56 * @sap: sap to use
57 * @skb: packet to send
58 * @dmac: destination mac address
59 * @dsap: destination sap
60 *
61 * Upper layers calls this function when upper layer wants to send data
62 * using connection-less mode communication (UI pdu).
63 *
64 * Accept data frame from network layer to be sent using connection-
65 * less mode communication; timeout/retries handled by network layer;
66 * package primitive as an event and send to SAP event handler
67 */
68int llc_build_and_send_ui_pkt(struct llc_sap *sap, struct sk_buff *skb,
69 unsigned char *dmac, unsigned char dsap)
70{
71 int rc;
72 llc_pdu_header_init(skb, LLC_PDU_TYPE_U, sap->laddr.lsap,
73 dsap, LLC_PDU_CMD);
74 llc_pdu_init_as_ui_cmd(skb);
75 rc = llc_mac_hdr_init(skb, skb->dev->dev_addr, dmac);
Arnaldo Carvalho de Melo249ff1c2005-09-22 04:32:10 -030076 if (likely(!rc))
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 rc = dev_queue_xmit(skb);
78 return rc;
79}
80
81EXPORT_SYMBOL(llc_mac_hdr_init);
82EXPORT_SYMBOL(llc_build_and_send_ui_pkt);