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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/net/llc/llc_output.c
15109 views
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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 <[email protected]>

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 *

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 * This program can be redistributed or modified under the terms of the

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 * GNU General Public License version 2 as published by the Free Software

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 * Foundation.

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 * This program is distributed without any warranty or implied warranty

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 * of merchantability or fitness for a particular purpose.

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 *

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 * See the GNU General Public License version 2 for more details.

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 */

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#include <linux/if_arp.h>

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#include <linux/if_tr.h>

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#include <linux/netdevice.h>

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#include <linux/trdevice.h>

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#include <linux/skbuff.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_IEEE802_TR:

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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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		WARN(1, "device type not supported: %d\n", skb->dev->type);

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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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	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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