cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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fc.c (2580B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * NET3:	Fibre Channel device handling subroutines
      4 *
      5 *		Vineet Abraham <vma@iol.unh.edu>
      6 *		v 1.0 03/22/99
      7 */
      8
      9#include <linux/uaccess.h>
     10#include <linux/types.h>
     11#include <linux/kernel.h>
     12#include <linux/string.h>
     13#include <linux/mm.h>
     14#include <linux/socket.h>
     15#include <linux/in.h>
     16#include <linux/inet.h>
     17#include <linux/netdevice.h>
     18#include <linux/fcdevice.h>
     19#include <linux/skbuff.h>
     20#include <linux/errno.h>
     21#include <linux/timer.h>
     22#include <linux/net.h>
     23#include <linux/proc_fs.h>
     24#include <linux/init.h>
     25#include <linux/export.h>
     26#include <net/arp.h>
     27
     28/*
     29 *	Put the headers on a Fibre Channel packet.
     30 */
     31
     32static int fc_header(struct sk_buff *skb, struct net_device *dev,
     33		     unsigned short type,
     34		     const void *daddr, const void *saddr, unsigned int len)
     35{
     36	struct fch_hdr *fch;
     37	int hdr_len;
     38
     39	/*
     40	 * Add the 802.2 SNAP header if IP as the IPv4 code calls
     41	 * dev->hard_header directly.
     42	 */
     43	if (type == ETH_P_IP || type == ETH_P_ARP)
     44	{
     45		struct fcllc *fcllc;
     46
     47		hdr_len = sizeof(struct fch_hdr) + sizeof(struct fcllc);
     48		fch = skb_push(skb, hdr_len);
     49		fcllc = (struct fcllc *)(fch+1);
     50		fcllc->dsap = fcllc->ssap = EXTENDED_SAP;
     51		fcllc->llc = UI_CMD;
     52		fcllc->protid[0] = fcllc->protid[1] = fcllc->protid[2] = 0x00;
     53		fcllc->ethertype = htons(type);
     54	}
     55	else
     56	{
     57		hdr_len = sizeof(struct fch_hdr);
     58		fch = skb_push(skb, hdr_len);
     59	}
     60
     61	if(saddr)
     62		memcpy(fch->saddr,saddr,dev->addr_len);
     63	else
     64		memcpy(fch->saddr,dev->dev_addr,dev->addr_len);
     65
     66	if(daddr)
     67	{
     68		memcpy(fch->daddr,daddr,dev->addr_len);
     69		return hdr_len;
     70	}
     71	return -hdr_len;
     72}
     73
     74static const struct header_ops fc_header_ops = {
     75	.create	 = fc_header,
     76};
     77
     78static void fc_setup(struct net_device *dev)
     79{
     80	dev->header_ops		= &fc_header_ops;
     81	dev->type		= ARPHRD_IEEE802;
     82	dev->hard_header_len	= FC_HLEN;
     83	dev->mtu		= 2024;
     84	dev->addr_len		= FC_ALEN;
     85	dev->tx_queue_len	= 100; /* Long queues on fc */
     86	dev->flags		= IFF_BROADCAST;
     87
     88	memset(dev->broadcast, 0xFF, FC_ALEN);
     89}
     90
     91/**
     92 * alloc_fcdev - Register fibre channel device
     93 * @sizeof_priv: Size of additional driver-private structure to be allocated
     94 *	for this fibre channel device
     95 *
     96 * Fill in the fields of the device structure with fibre channel-generic values.
     97 *
     98 * Constructs a new net device, complete with a private data area of
     99 * size @sizeof_priv.  A 32-byte (not bit) alignment is enforced for
    100 * this private data area.
    101 */
    102struct net_device *alloc_fcdev(int sizeof_priv)
    103{
    104	return alloc_netdev(sizeof_priv, "fc%d", NET_NAME_UNKNOWN, fc_setup);
    105}
    106EXPORT_SYMBOL(alloc_fcdev);