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Linux/net/llc/llc_output.c

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  1 /*
  2  * llc_output.c - LLC minimal output path
  3  *
  4  * Copyright (c) 1997 by Procom Technology, Inc.
  5  *               2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
  6  *
  7  * This program can be redistributed or modified under the terms of the
  8  * GNU General Public License version 2 as published by the Free Software
  9  * Foundation.
 10  * This program is distributed without any warranty or implied warranty
 11  * of merchantability or fitness for a particular purpose.
 12  *
 13  * See the GNU General Public License version 2 for more details.
 14  */
 15 
 16 #include <linux/if_arp.h>
 17 #include <linux/netdevice.h>
 18 #include <linux/skbuff.h>
 19 #include <linux/export.h>
 20 #include <net/llc.h>
 21 #include <net/llc_pdu.h>
 22 
 23 /**
 24  *      llc_mac_hdr_init - fills MAC header fields
 25  *      @skb: Address of the frame to initialize its MAC header
 26  *      @sa: The MAC source address
 27  *      @da: The MAC destination address
 28  *
 29  *      Fills MAC header fields, depending on MAC type. Returns 0, If MAC type
 30  *      is a valid type and initialization completes correctly 1, otherwise.
 31  */
 32 int llc_mac_hdr_init(struct sk_buff *skb,
 33                      const unsigned char *sa, const unsigned char *da)
 34 {
 35         int rc = -EINVAL;
 36 
 37         switch (skb->dev->type) {
 38         case ARPHRD_ETHER:
 39         case ARPHRD_LOOPBACK:
 40                 rc = dev_hard_header(skb, skb->dev, ETH_P_802_2, da, sa,
 41                                      skb->len);
 42                 if (rc > 0)
 43                         rc = 0;
 44                 break;
 45         default:
 46                 break;
 47         }
 48         return rc;
 49 }
 50 
 51 /**
 52  *      llc_build_and_send_ui_pkt - unitdata request interface for upper layers
 53  *      @sap: sap to use
 54  *      @skb: packet to send
 55  *      @dmac: destination mac address
 56  *      @dsap: destination sap
 57  *
 58  *      Upper layers calls this function when upper layer wants to send data
 59  *      using connection-less mode communication (UI pdu).
 60  *
 61  *      Accept data frame from network layer to be sent using connection-
 62  *      less mode communication; timeout/retries handled by network layer;
 63  *      package primitive as an event and send to SAP event handler
 64  */
 65 int llc_build_and_send_ui_pkt(struct llc_sap *sap, struct sk_buff *skb,
 66                               unsigned char *dmac, unsigned char dsap)
 67 {
 68         int rc;
 69         llc_pdu_header_init(skb, LLC_PDU_TYPE_U, sap->laddr.lsap,
 70                             dsap, LLC_PDU_CMD);
 71         llc_pdu_init_as_ui_cmd(skb);
 72         rc = llc_mac_hdr_init(skb, skb->dev->dev_addr, dmac);
 73         if (likely(!rc))
 74                 rc = dev_queue_xmit(skb);
 75         return rc;
 76 }
 77 
 78 EXPORT_SYMBOL(llc_mac_hdr_init);
 79 EXPORT_SYMBOL(llc_build_and_send_ui_pkt);
 80 

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