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74 lines
2.0 KiB
74 lines
2.0 KiB
// 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 <[email protected]> |
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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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const 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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