llc_output.c

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/*
 * llc_output.c - LLC minimal output path
 *
 * Copyright (c) 1997 by Procom Technology, Inc.
 *       2001-2003 by Arnaldo Carvalho de Melo <[email protected]>
 *
 * This program can be redistributed or modified under the terms of the
 * GNU General Public License version 2 as published by the Free Software
 * Foundation.
 * This program is distributed without any warranty or implied warranty
 * of merchantability or fitness for a particular purpose.
 *
 * See the GNU General Public License version 2 for more details.
 */

#include <linux/if_arp.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/export.h>
#include <net/llc.h>
#include <net/llc_pdu.h>

int llc_mac_hdr_init(struct sk_buff *skb,
             const unsigned char *sa, const unsigned char *da)
{
    int rc = -EINVAL;

    switch (skb->dev->type) {
    case ARPHRD_ETHER:
    case ARPHRD_LOOPBACK:
        rc = dev_hard_header(skb, skb->dev, ETH_P_802_2, da, sa,
                     skb->len);
        if (rc > 0)
            rc = 0;
        break;
    default:
        WARN(1, "device type not supported: %d\n", skb->dev->type);
    }
    return rc;
}

int llc_build_and_send_ui_pkt(struct llc_sap *sap, struct sk_buff *skb,
                  unsigned char *dmac, unsigned char dsap)
{
    int rc;
    llc_pdu_header_init(skb, LLC_PDU_TYPE_U, sap->laddr.lsap,
                dsap, LLC_PDU_CMD);
    llc_pdu_init_as_ui_cmd(skb);
    rc = llc_mac_hdr_init(skb, skb->dev->dev_addr, dmac);
    if (likely(!rc))
        rc = dev_queue_xmit(skb);
    return rc;
}

EXPORT_SYMBOL(llc_mac_hdr_init);
EXPORT_SYMBOL(llc_build_and_send_ui_pkt);