// SPDX-License-Identifier: GPL-2.0-or-later/* * NET3:	Fibre Channel device handling subroutines * *		Vineet Abraham <vma@iol.unh.edu> *		v 1.0 03/22/99 */ #include <linux/uaccess.h>#include <linux/types.h>#include <linux/kernel.h>#include <linux/string.h>#include <linux/mm.h>#include <linux/socket.h>#include <linux/in.h>#include <linux/inet.h>#include <linux/netdevice.h>#include <linux/fcdevice.h>#include <linux/skbuff.h>#include <linux/errno.h>#include <linux/timer.h>#include <linux/net.h>#include <linux/proc_fs.h>#include <linux/init.h>#include <linux/export.h>#include <net/arp.h> /* *	Put the headers on a Fibre Channel packet. */ static int fc_header(struct sk_buff *skb, struct net_device *dev,		     unsigned short type,		     const void *daddr, const void *saddr, unsigned int len){	struct fch_hdr *fch;	int hdr_len; 	/*	 * Add the 802.2 SNAP header if IP as the IPv4 code calls	 * dev->hard_header directly.	 */	if (type == ETH_P_IP || type == ETH_P_ARP)	{		struct fcllc *fcllc; 		hdr_len = sizeof(struct fch_hdr) + sizeof(struct fcllc);		fch = skb_push(skb, hdr_len);		fcllc = (struct fcllc *)(fch+1);		fcllc->dsap = fcllc->ssap = EXTENDED_SAP;		fcllc->llc = UI_CMD;		fcllc->protid[0] = fcllc->protid[1] = fcllc->protid[2] = 0x00;		fcllc->ethertype = htons(type);	}	else	{		hdr_len = sizeof(struct fch_hdr);		fch = skb_push(skb, hdr_len);	} 	if(saddr)		memcpy(fch->saddr,saddr,dev->addr_len);	else		memcpy(fch->saddr,dev->dev_addr,dev->addr_len); 	if(daddr)	{		memcpy(fch->daddr,daddr,dev->addr_len);		return hdr_len;	}	return -hdr_len;} static const struct header_ops fc_header_ops = {	.create	 = fc_header,}; static void fc_setup(struct net_device *dev){	dev->header_ops		= &fc_header_ops;	dev->type		= ARPHRD_IEEE802;	dev->hard_header_len	= FC_HLEN;	dev->mtu		= 2024;	dev->addr_len		= FC_ALEN;	dev->tx_queue_len	= 100; /* Long queues on fc */	dev->flags		= IFF_BROADCAST; 	memset(dev->broadcast, 0xFF, FC_ALEN);} /** * alloc_fcdev - Register fibre channel device * @sizeof_priv: Size of additional driver-private structure to be allocated *	for this fibre channel device * * Fill in the fields of the device structure with fibre channel-generic values. * * Constructs a new net device, complete with a private data area of * size @sizeof_priv.  A 32-byte (not bit) alignment is enforced for * this private data area. */struct net_device *alloc_fcdev(int sizeof_priv){	return alloc_netdev(sizeof_priv, "fc%d", NET_NAME_UNKNOWN, fc_setup);}EXPORT_SYMBOL(alloc_fcdev);