mirror of https://gitee.com/openkylin/linux.git
132 lines
3.3 KiB
C
132 lines
3.3 KiB
C
/*
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* NET3: Fibre Channel device handling subroutines
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Vineet Abraham <vma@iol.unh.edu>
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* v 1.0 03/22/99
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*/
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#include <asm/uaccess.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/socket.h>
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#include <linux/in.h>
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#include <linux/inet.h>
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#include <linux/netdevice.h>
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#include <linux/fcdevice.h>
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#include <linux/skbuff.h>
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#include <linux/errno.h>
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#include <linux/timer.h>
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#include <linux/net.h>
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#include <linux/proc_fs.h>
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#include <linux/init.h>
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#include <linux/export.h>
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#include <net/arp.h>
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/*
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* Put the headers on a Fibre Channel packet.
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*/
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static int fc_header(struct sk_buff *skb, struct net_device *dev,
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unsigned short type,
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const void *daddr, const void *saddr, unsigned len)
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{
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struct fch_hdr *fch;
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int hdr_len;
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/*
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* Add the 802.2 SNAP header if IP as the IPv4 code calls
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* dev->hard_header directly.
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*/
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if (type == ETH_P_IP || type == ETH_P_ARP)
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{
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struct fcllc *fcllc;
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hdr_len = sizeof(struct fch_hdr) + sizeof(struct fcllc);
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fch = (struct fch_hdr *)skb_push(skb, hdr_len);
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fcllc = (struct fcllc *)(fch+1);
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fcllc->dsap = fcllc->ssap = EXTENDED_SAP;
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fcllc->llc = UI_CMD;
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fcllc->protid[0] = fcllc->protid[1] = fcllc->protid[2] = 0x00;
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fcllc->ethertype = htons(type);
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}
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else
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{
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hdr_len = sizeof(struct fch_hdr);
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fch = (struct fch_hdr *)skb_push(skb, hdr_len);
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}
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if(saddr)
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memcpy(fch->saddr,saddr,dev->addr_len);
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else
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memcpy(fch->saddr,dev->dev_addr,dev->addr_len);
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if(daddr)
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{
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memcpy(fch->daddr,daddr,dev->addr_len);
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return hdr_len;
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}
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return -hdr_len;
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}
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/*
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* A neighbour discovery of some species (eg arp) has completed. We
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* can now send the packet.
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*/
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static int fc_rebuild_header(struct sk_buff *skb)
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{
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#ifdef CONFIG_INET
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struct fch_hdr *fch=(struct fch_hdr *)skb->data;
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struct fcllc *fcllc=(struct fcllc *)(skb->data+sizeof(struct fch_hdr));
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if(fcllc->ethertype != htons(ETH_P_IP)) {
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printk("fc_rebuild_header: Don't know how to resolve type %04X addresses ?\n", ntohs(fcllc->ethertype));
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return 0;
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}
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return arp_find(fch->daddr, skb);
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#else
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return 0;
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#endif
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}
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static const struct header_ops fc_header_ops = {
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.create = fc_header,
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.rebuild = fc_rebuild_header,
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};
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static void fc_setup(struct net_device *dev)
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{
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dev->header_ops = &fc_header_ops;
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dev->type = ARPHRD_IEEE802;
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dev->hard_header_len = FC_HLEN;
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dev->mtu = 2024;
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dev->addr_len = FC_ALEN;
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dev->tx_queue_len = 100; /* Long queues on fc */
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dev->flags = IFF_BROADCAST;
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memset(dev->broadcast, 0xFF, FC_ALEN);
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}
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/**
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* alloc_fcdev - Register fibre channel device
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* @sizeof_priv: Size of additional driver-private structure to be allocated
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* for this fibre channel device
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*
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* Fill in the fields of the device structure with fibre channel-generic values.
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*
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* Constructs a new net device, complete with a private data area of
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* size @sizeof_priv. A 32-byte (not bit) alignment is enforced for
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* this private data area.
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*/
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struct net_device *alloc_fcdev(int sizeof_priv)
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{
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return alloc_netdev(sizeof_priv, "fc%d", fc_setup);
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}
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EXPORT_SYMBOL(alloc_fcdev);
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