2 * llc_output.c - LLC minimal output path
4 * Copyright (c) 1997 by Procom Technology, Inc.
5 * 2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
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
10 * This program is distributed without any warranty or implied warranty
11 * of merchantability or fitness for a particular purpose.
13 * See the GNU General Public License version 2 for more details.
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>
22 #include <net/llc_pdu.h>
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
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.
33 int llc_mac_hdr_init(struct sk_buff *skb,
34 const unsigned char *sa, const unsigned char *da)
38 switch (skb->dev->type) {
40 case ARPHRD_IEEE802_TR: {
41 struct net_device *dev = skb->dev;
44 skb_push(skb, sizeof(*trh));
45 skb_reset_mac_header(skb);
50 memcpy(trh->saddr, sa, dev->addr_len);
52 memset(trh->saddr, 0, dev->addr_len);
54 memcpy(trh->daddr, da, dev->addr_len);
55 tr_source_route(skb, trh, dev);
56 skb_reset_mac_header(skb);
62 case ARPHRD_LOOPBACK: {
63 unsigned short len = skb->len;
66 skb_push(skb, sizeof(*eth));
67 skb_reset_mac_header(skb);
69 eth->h_proto = htons(len);
70 memcpy(eth->h_dest, da, ETH_ALEN);
71 memcpy(eth->h_source, sa, ETH_ALEN);
75 printk(KERN_WARNING "device type not supported: %d\n",
83 * llc_build_and_send_ui_pkt - unitdata request interface for upper layers
85 * @skb: packet to send
86 * @dmac: destination mac address
87 * @dsap: destination sap
89 * Upper layers calls this function when upper layer wants to send data
90 * using connection-less mode communication (UI pdu).
92 * Accept data frame from network layer to be sent using connection-
93 * less mode communication; timeout/retries handled by network layer;
94 * package primitive as an event and send to SAP event handler
96 int llc_build_and_send_ui_pkt(struct llc_sap *sap, struct sk_buff *skb,
97 unsigned char *dmac, unsigned char dsap)
100 llc_pdu_header_init(skb, LLC_PDU_TYPE_U, sap->laddr.lsap,
102 llc_pdu_init_as_ui_cmd(skb);
103 rc = llc_mac_hdr_init(skb, skb->dev->dev_addr, dmac);
105 rc = dev_queue_xmit(skb);
109 EXPORT_SYMBOL(llc_mac_hdr_init);
110 EXPORT_SYMBOL(llc_build_and_send_ui_pkt);