/* * 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_push(skb, sizeof(*trh)); skb_reset_mac_header(skb); 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_reset_mac_header(skb); } break; } #endif case ARPHRD_ETHER: case ARPHRD_LOOPBACK: { unsigned short len = skb->len; struct ethhdr *eth; skb_push(skb, sizeof(*eth)); skb_reset_mac_header(skb); 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);