// SPDX-License-Identifier: GPL-2.0-only
/*
 * llc_output.c - LLC minimal output path
 *
 * Copyright (c) 1997 by Procom Technology, Inc.
 *               2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
 */

#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>

/**
 *      llc_mac_hdr_init - fills MAC header fields
 *      @skb: Address of the frame to initialize its MAC header
 *      @sa: The MAC source address
 *      @da: The MAC destination address
 *
 *      Fills MAC header fields, depending on MAC type. Returns 0, If MAC type
 *      is a valid type and initialization completes correctly 1, otherwise.
 */
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:
                break;
        }
        return rc;
}

/**
 *      llc_build_and_send_ui_pkt - unitdata request interface for upper layers
 *      @sap: sap to use
 *      @skb: packet to send
 *      @dmac: destination mac address
 *      @dsap: destination sap
 *
 *      Upper layers calls this function when upper layer wants to send data
 *      using connection-less mode communication (UI pdu).
 *
 *      Accept data frame from network layer to be sent using connection-
 *      less mode communication; timeout/retries handled by network layer;
 *      package primitive as an event and send to SAP event handler
 */
int llc_build_and_send_ui_pkt(struct llc_sap *sap, struct sk_buff *skb,
                              const 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);
        else
                kfree_skb(skb);
        return rc;
}

EXPORT_SYMBOL(llc_mac_hdr_init);
EXPORT_SYMBOL(llc_build_and_send_ui_pkt);