// SPDX-License-Identifier: GPL-2.0-only
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/*
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* llc_output.c - LLC minimal output path
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*
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* Copyright (c) 1997 by Procom Technology, Inc.
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* 2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
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*/
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#include <linux/if_arp.h>
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <linux/export.h>
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#include <net/llc.h>
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#include <net/llc_pdu.h>
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/**
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* llc_mac_hdr_init - fills MAC header fields
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* @skb: Address of the frame to initialize its MAC header
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* @sa: The MAC source address
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* @da: The MAC destination address
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*
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* Fills MAC header fields, depending on MAC type. Returns 0, If MAC type
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* is a valid type and initialization completes correctly 1, otherwise.
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*/
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int llc_mac_hdr_init(struct sk_buff *skb,
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const unsigned char *sa, const unsigned char *da)
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{
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int rc = -EINVAL;
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switch (skb->dev->type) {
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case ARPHRD_ETHER:
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case ARPHRD_LOOPBACK:
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rc = dev_hard_header(skb, skb->dev, ETH_P_802_2, da, sa,
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skb->len);
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if (rc > 0)
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rc = 0;
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break;
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default:
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break;
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}
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return rc;
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}
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/**
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* llc_build_and_send_ui_pkt - unitdata request interface for upper layers
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* @sap: sap to use
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* @skb: packet to send
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* @dmac: destination mac address
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* @dsap: destination sap
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*
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* Upper layers calls this function when upper layer wants to send data
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* using connection-less mode communication (UI pdu).
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*
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* Accept data frame from network layer to be sent using connection-
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* less mode communication; timeout/retries handled by network layer;
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* package primitive as an event and send to SAP event handler
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*/
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int llc_build_and_send_ui_pkt(struct llc_sap *sap, struct sk_buff *skb,
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unsigned char *dmac, unsigned char dsap)
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{
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int rc;
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llc_pdu_header_init(skb, LLC_PDU_TYPE_U, sap->laddr.lsap,
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dsap, LLC_PDU_CMD);
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llc_pdu_init_as_ui_cmd(skb);
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rc = llc_mac_hdr_init(skb, skb->dev->dev_addr, dmac);
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if (likely(!rc))
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rc = dev_queue_xmit(skb);
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else
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kfree_skb(skb);
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return rc;
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}
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EXPORT_SYMBOL(llc_mac_hdr_init);
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EXPORT_SYMBOL(llc_build_and_send_ui_pkt);
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