109 lines
2.9 KiB
C
109 lines
2.9 KiB
C
/*
|
|
* 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>
|
|
*
|
|
* This program can be redistributed or modified under the terms of the
|
|
* GNU General Public License version 2 as published by the Free Software
|
|
* Foundation.
|
|
* This program is distributed without any warranty or implied warranty
|
|
* of merchantability or fitness for a particular purpose.
|
|
*
|
|
* See the GNU General Public License version 2 for more details.
|
|
*/
|
|
|
|
#include <linux/if_arp.h>
|
|
#include <linux/if_tr.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/trdevice.h>
|
|
#include <linux/skbuff.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 = 0;
|
|
|
|
switch (skb->dev->type) {
|
|
#ifdef CONFIG_TR
|
|
case ARPHRD_IEEE802_TR: {
|
|
struct net_device *dev = skb->dev;
|
|
struct trh_hdr *trh;
|
|
|
|
skb->mac.raw = skb_push(skb, sizeof(*trh));
|
|
trh = tr_hdr(skb);
|
|
trh->ac = AC;
|
|
trh->fc = LLC_FRAME;
|
|
if (sa)
|
|
memcpy(trh->saddr, sa, dev->addr_len);
|
|
else
|
|
memset(trh->saddr, 0, dev->addr_len);
|
|
if (da) {
|
|
memcpy(trh->daddr, da, dev->addr_len);
|
|
tr_source_route(skb, trh, dev);
|
|
skb->mac.raw = skb->data;
|
|
}
|
|
break;
|
|
}
|
|
#endif
|
|
case ARPHRD_ETHER:
|
|
case ARPHRD_LOOPBACK: {
|
|
unsigned short len = skb->len;
|
|
struct ethhdr *eth;
|
|
|
|
skb->mac.raw = skb_push(skb, sizeof(*eth));
|
|
eth = eth_hdr(skb);
|
|
eth->h_proto = htons(len);
|
|
memcpy(eth->h_dest, da, ETH_ALEN);
|
|
memcpy(eth->h_source, sa, ETH_ALEN);
|
|
break;
|
|
}
|
|
default:
|
|
printk(KERN_WARNING "device type not supported: %d\n",
|
|
skb->dev->type);
|
|
rc = -EINVAL;
|
|
}
|
|
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,
|
|
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);
|
|
return rc;
|
|
}
|
|
|
|
EXPORT_SYMBOL(llc_mac_hdr_init);
|
|
EXPORT_SYMBOL(llc_build_and_send_ui_pkt);
|