111 lines
3.0 KiB
C
111 lines
3.0 KiB
C
/*
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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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* 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 = 0;
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switch (skb->dev->type) {
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#ifdef CONFIG_TR
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case ARPHRD_IEEE802_TR: {
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struct net_device *dev = skb->dev;
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struct trh_hdr *trh;
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skb_push(skb, sizeof(*trh));
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skb_reset_mac_header(skb);
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trh = tr_hdr(skb);
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trh->ac = AC;
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trh->fc = LLC_FRAME;
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if (sa)
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memcpy(trh->saddr, sa, dev->addr_len);
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else
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memset(trh->saddr, 0, dev->addr_len);
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if (da) {
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memcpy(trh->daddr, da, dev->addr_len);
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tr_source_route(skb, trh, dev);
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skb_reset_mac_header(skb);
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}
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break;
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}
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#endif
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case ARPHRD_ETHER:
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case ARPHRD_LOOPBACK: {
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unsigned short len = skb->len;
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struct ethhdr *eth;
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skb_push(skb, sizeof(*eth));
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skb_reset_mac_header(skb);
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eth = eth_hdr(skb);
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eth->h_proto = htons(len);
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memcpy(eth->h_dest, da, ETH_ALEN);
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memcpy(eth->h_source, sa, ETH_ALEN);
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break;
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}
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default:
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printk(KERN_WARNING "device type not supported: %d\n",
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skb->dev->type);
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rc = -EINVAL;
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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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