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 <net/llc.h> 22 #include <net/llc_pdu.h> 23 24 /** 25 * llc_mac_hdr_init - fills MAC header fields 26 * @skb: Address of the frame to initialize its MAC header 27 * @sa: The MAC source address 28 * @da: The MAC destination address 29 * 30 * Fills MAC header fields, depending on MAC type. Returns 0, If MAC type 31 * is a valid type and initialization completes correctly 1, otherwise. 32 */ 33 int llc_mac_hdr_init(struct sk_buff *skb, unsigned char *sa, unsigned char *da) 34 { 35 int rc = 0; 36 37 switch (skb->dev->type) { 38 #ifdef CONFIG_TR 39 case ARPHRD_IEEE802_TR: { 40 struct net_device *dev = skb->dev; 41 struct trh_hdr *trh; 42 43 skb->mac.raw = skb_push(skb, sizeof(*trh)); 44 trh = tr_hdr(skb); 45 trh->ac = AC; 46 trh->fc = LLC_FRAME; 47 if (sa) 48 memcpy(trh->saddr, sa, dev->addr_len); 49 else 50 memset(trh->saddr, 0, dev->addr_len); 51 if (da) { 52 memcpy(trh->daddr, da, dev->addr_len); 53 tr_source_route(skb, trh, dev); 54 skb->mac.raw = skb->data; 55 } 56 break; 57 } 58 #endif 59 case ARPHRD_ETHER: 60 case ARPHRD_LOOPBACK: { 61 unsigned short len = skb->len; 62 struct ethhdr *eth; 63 64 skb->mac.raw = skb_push(skb, sizeof(*eth)); 65 eth = eth_hdr(skb); 66 eth->h_proto = htons(len); 67 memcpy(eth->h_dest, da, ETH_ALEN); 68 memcpy(eth->h_source, sa, ETH_ALEN); 69 break; 70 } 71 default: 72 printk(KERN_WARNING "device type not supported: %d\n", 73 skb->dev->type); 74 rc = -EINVAL; 75 } 76 return rc; 77 } 78 79 /** 80 * llc_build_and_send_ui_pkt - unitdata request interface for upper layers 81 * @sap: sap to use 82 * @skb: packet to send 83 * @dmac: destination mac address 84 * @dsap: destination sap 85 * 86 * Upper layers calls this function when upper layer wants to send data 87 * using connection-less mode communication (UI pdu). 88 * 89 * Accept data frame from network layer to be sent using connection- 90 * less mode communication; timeout/retries handled by network layer; 91 * package primitive as an event and send to SAP event handler 92 */ 93 int llc_build_and_send_ui_pkt(struct llc_sap *sap, struct sk_buff *skb, 94 unsigned char *dmac, unsigned char dsap) 95 { 96 int rc; 97 llc_pdu_header_init(skb, LLC_PDU_TYPE_U, sap->laddr.lsap, 98 dsap, LLC_PDU_CMD); 99 llc_pdu_init_as_ui_cmd(skb); 100 rc = llc_mac_hdr_init(skb, skb->dev->dev_addr, dmac); 101 if (likely(!rc)) 102 rc = dev_queue_xmit(skb); 103 return rc; 104 } 105 106 EXPORT_SYMBOL(llc_mac_hdr_init); 107 EXPORT_SYMBOL(llc_build_and_send_ui_pkt); 108