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/if_tr.h> 18 #include <linux/netdevice.h> 19 #include <linux/trdevice.h> 20 #include <linux/skbuff.h> 21 #include <linux/export.h> 22 #include <net/llc.h> 23 #include <net/llc_pdu.h> 24 25 /** 26 * llc_mac_hdr_init - fills MAC header fields 27 * @skb: Address of the frame to initialize its MAC header 28 * @sa: The MAC source address 29 * @da: The MAC destination address 30 * 31 * Fills MAC header fields, depending on MAC type. Returns 0, If MAC type 32 * is a valid type and initialization completes correctly 1, otherwise. 33 */ 34 int llc_mac_hdr_init(struct sk_buff *skb, 35 const unsigned char *sa, const unsigned char *da) 36 { 37 int rc = -EINVAL; 38 39 switch (skb->dev->type) { 40 case ARPHRD_IEEE802_TR: 41 case ARPHRD_ETHER: 42 case ARPHRD_LOOPBACK: 43 rc = dev_hard_header(skb, skb->dev, ETH_P_802_2, da, sa, 44 skb->len); 45 if (rc > 0) 46 rc = 0; 47 break; 48 default: 49 WARN(1, "device type not supported: %d\n", skb->dev->type); 50 } 51 return rc; 52 } 53 54 /** 55 * llc_build_and_send_ui_pkt - unitdata request interface for upper layers 56 * @sap: sap to use 57 * @skb: packet to send 58 * @dmac: destination mac address 59 * @dsap: destination sap 60 * 61 * Upper layers calls this function when upper layer wants to send data 62 * using connection-less mode communication (UI pdu). 63 * 64 * Accept data frame from network layer to be sent using connection- 65 * less mode communication; timeout/retries handled by network layer; 66 * package primitive as an event and send to SAP event handler 67 */ 68 int llc_build_and_send_ui_pkt(struct llc_sap *sap, struct sk_buff *skb, 69 unsigned char *dmac, unsigned char dsap) 70 { 71 int rc; 72 llc_pdu_header_init(skb, LLC_PDU_TYPE_U, sap->laddr.lsap, 73 dsap, LLC_PDU_CMD); 74 llc_pdu_init_as_ui_cmd(skb); 75 rc = llc_mac_hdr_init(skb, skb->dev->dev_addr, dmac); 76 if (likely(!rc)) 77 rc = dev_queue_xmit(skb); 78 return rc; 79 } 80 81 EXPORT_SYMBOL(llc_mac_hdr_init); 82 EXPORT_SYMBOL(llc_build_and_send_ui_pkt); 83