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path: root/drivers/net/macsec.c
AgeCommit message (Expand)Author
2018-10-28macsec: let the administrator set UP state even if lowerdev is downSabrina Dubroca
2018-10-28macsec: update operstate when lower device changesSabrina Dubroca
2018-09-21DRIVERS: net: macsec: Fix multiple coding style issuesRomain Aviolat
2018-04-16Revert "macsec: missing dev_put() on error in macsec_newlink()"Dan Carpenter
2018-03-22macsec: missing dev_put() on error in macsec_newlink()Dan Carpenter
2018-01-22macsec: restore uAPI after addition of GCM-AES-256Sabrina Dubroca
2018-01-09macsec: Add support for GCM-AES-256 cipher suiteFelix Walter
2017-11-16genetlink: fix genlmsg_nlhdr()Michal Kubecek
2017-10-22Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller
2017-10-22drivers, net: convert masces_tx_sa.refcnt from atomic_t to refcount_tElena Reshetova
2017-10-22drivers, net: convert masces_rx_sc.refcnt from atomic_t to refcount_tElena Reshetova
2017-10-22drivers, net: convert masces_rx_sa.refcnt from atomic_t to refcount_tElena Reshetova
2017-10-11macsec: fix memory leaks when skb_to_sgvec failsSabrina Dubroca
2017-10-04net: Add extack to upper device linkingDavid Ahern
2017-08-22macsec: add genl family module aliasSabrina Dubroca
2017-06-26net: add netlink_ext_ack argument to rtnl_link_ops.validateMatthias Schiffer
2017-06-26net: add netlink_ext_ack argument to rtnl_link_ops.changelinkMatthias Schiffer
2017-06-26net: add netlink_ext_ack argument to rtnl_link_ops.newlinkMatthias Schiffer
2017-06-16networking: make skb_push & __skb_push return void pointersJohannes Berg
2017-06-15Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller
2017-06-07net: Fix inconsistent teardown and release of private netdev state.David S. Miller
2017-06-04macsec: check return value of skb_to_sgvec alwaysJason A. Donenfeld
2017-05-22macsec: double accounting of dropped rx/tx packetsGirish Moodalbail
2017-04-26Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller
2017-04-26macsec: dynamically allocate space for sglistJason A. Donenfeld
2017-04-24macsec: avoid heap overflow in skb_to_sgvecJason A. Donenfeld
2017-04-13netlink: pass extended ACK struct to parsing functionsJohannes Berg
2017-02-21macsec: fix validation failed in asynchronous operation.Lee Ryder
2017-01-08net: make ndo_get_stats64 a void functionstephen hemminger
2016-12-08macsec: remove first zero and add attribute name in commentsZhang Shengju
2016-10-30Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller
2016-10-27macsec: Fix header length if SCI is added if explicitly disabledTobias Brunner
2016-10-27genetlink: mark families as __ro_after_initJohannes Berg
2016-10-27genetlink: statically initialize familiesJohannes Berg
2016-10-27genetlink: no longer support using static family IDsJohannes Berg
2016-10-20net: use core MTU range checking in core net infraJarod Wilson
2016-09-09macsec: set network devtypestephen hemminger
2016-08-13net: remove type_check from dev_get_nest_level()Sabrina Dubroca
2016-08-13macsec: fix lockdep splats when nesting devicesSabrina Dubroca
2016-08-11macsec: use after free when deleting the underlying deviceSabrina Dubroca
2016-07-30macsec: fix negative refcnt on parent linkSabrina Dubroca
2016-07-30macsec: RXSAs don't need to hold a reference on RXSCsSabrina Dubroca
2016-07-30macsec: fix reference counting on RXSC in macsec_handle_frameSabrina Dubroca
2016-07-26macsec: ensure rx_sa is set when validation is disabledBeniamino Galvani
2016-07-25macsec: validate ICV length on link creationDavide Caratti
2016-07-25macsec: fix error codes when a SA is createdDavide Caratti
2016-07-25macsec: limit ICV length to 16 octetsDavide Caratti
2016-07-22macsec: enable GRO and RPS on macsec devicesPaolo Abeni
2016-07-01macsec: set actual real device for xmit when !protect_framesDaniel Borkmann
2016-06-15macsec: fix SA initializationSabrina Dubroca
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-12 17:39:03 +0000
d='n394' href='#n394'>394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 
/*
 * Direct MTD block device access
 *
 * Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org>
 * Copyright © 2000-2003 Nicolas Pitre <nico@fluxnic.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

#include <linux/fs.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/vmalloc.h>

#include <linux/mtd/mtd.h>
#include <linux/mtd/blktrans.h>
#include <linux/mutex.h>


struct mtdblk_dev {
	struct mtd_blktrans_dev mbd;
	int count;
	struct mutex cache_mutex;
	unsigned char *cache_data;
	unsigned long cache_offset;
	unsigned int cache_size;
	enum { STATE_EMPTY, STATE_CLEAN, STATE_DIRTY } cache_state;
};

static struct mutex mtdblks_lock;

/*
 * Cache stuff...
 *
 * Since typical flash erasable sectors are much larger than what Linux's
 * buffer cache can handle, we must implement read-modify-write on flash
 * sectors for each block write requests.  To avoid over-erasing flash sectors
 * and to speed things up, we locally cache a whole flash sector while it is
 * being written to until a different sector is required.
 */

static void erase_callback(struct erase_info *done)
{
	wait_queue_head_t *wait_q = (wait_queue_head_t *)done->priv;
	wake_up(wait_q);
}

static int erase_write (struct mtd_info *mtd, unsigned long pos,
			int len, const char *buf)
{
	struct erase_info erase;
	DECLARE_WAITQUEUE(wait, current);
	wait_queue_head_t wait_q;
	size_t retlen;
	int ret;

	/*
	 * First, let's erase the flash block.
	 */

	init_waitqueue_head(&wait_q);
	erase.mtd = mtd;
	erase.callback = erase_callback;
	erase.addr = pos;
	erase.len = len;
	erase.priv = (u_long)&wait_q;

	set_current_state(TASK_INTERRUPTIBLE);
	add_wait_queue(&wait_q, &wait);

	ret = mtd->erase(mtd, &erase);
	if (ret) {
		set_current_state(TASK_RUNNING);
		remove_wait_queue(&wait_q, &wait);
		printk (KERN_WARNING "mtdblock: erase of region [0x%lx, 0x%x] "
				     "on \"%s\" failed\n",
			pos, len, mtd->name);
		return ret;
	}

	schedule();  /* Wait for erase to finish. */
	remove_wait_queue(&wait_q, &wait);

	/*
	 * Next, write the data to flash.
	 */

	ret = mtd->write(mtd, pos, len, &retlen, buf);
	if (ret)
		return ret;
	if (retlen != len)
		return -EIO;
	return 0;
}


static int write_cached_data (struct mtdblk_dev *mtdblk)
{
	struct mtd_info *mtd = mtdblk->mbd.mtd;
	int ret;

	if (mtdblk->cache_state != STATE_DIRTY)
		return 0;

	DEBUG(MTD_DEBUG_LEVEL2, "mtdblock: writing cached data for \"%s\" "
			"at 0x%lx, size 0x%x\n", mtd->name,
			mtdblk->cache_offset, mtdblk->cache_size);

	ret = erase_write (mtd, mtdblk->cache_offset,
			   mtdblk->cache_size, mtdblk->cache_data);
	if (ret)
		return ret;

	/*
	 * Here we could arguably set the cache state to STATE_CLEAN.
	 * However this could lead to inconsistency since we will not
	 * be notified if this content is altered on the flash by other
	 * means.  Let's declare it empty and leave buffering tasks to
	 * the buffer cache instead.
	 */
	mtdblk->cache_state = STATE_EMPTY;
	return 0;
}


static int do_cached_write (struct mtdblk_dev *mtdblk, unsigned long pos,
			    int len, const char *buf)
{
	struct mtd_info *mtd = mtdblk->mbd.mtd;
	unsigned int sect_size = mtdblk->cache_size;
	size_t retlen;
	int ret;

	DEBUG(MTD_DEBUG_LEVEL2, "mtdblock: write on \"%s\" at 0x%lx, size 0x%x\n",
		mtd->name, pos, len);

	if (!sect_size)
		return mtd->write(mtd, pos, len, &retlen, buf);

	while (len > 0) {
		unsigned long sect_start = (pos/sect_size)*sect_size;
		unsigned int offset = pos - sect_start;
		unsigned int size = sect_size - offset;
		if( size > len )
			size = len;

		if (size == sect_size) {
			/*
			 * We are covering a whole sector.  Thus there is no
			 * need to bother with the cache while it may still be
			 * useful for other partial writes.
			 */
			ret = erase_write (mtd, pos, size, buf);
			if (ret)
				return ret;
		} else {
			/* Partial sector: need to use the cache */

			if (mtdblk->cache_state == STATE_DIRTY &&
			    mtdblk->cache_offset != sect_start) {
				ret = write_cached_data(mtdblk);
				if (ret)
					return ret;
			}

			if (mtdblk->cache_state == STATE_EMPTY ||
			    mtdblk->cache_offset != sect_start) {
				/* fill the cache with the current sector */
				mtdblk->cache_state = STATE_EMPTY;
				ret = mtd->read(mtd, sect_start, sect_size,
						&retlen, mtdblk->cache_data);
				if (ret)
					return ret;
				if (retlen != sect_size)
					return -EIO;

				mtdblk->cache_offset = sect_start;
				mtdblk->cache_size = sect_size;
				mtdblk->cache_state = STATE_CLEAN;
			}

			/* write data to our local cache */
			memcpy (mtdblk->cache_data + offset, buf, size);
			mtdblk->cache_state = STATE_DIRTY;
		}

		buf += size;
		pos += size;
		len -= size;
	}

	return 0;
}


static int do_cached_read (struct mtdblk_dev *mtdblk, unsigned long pos,
			   int len, char *buf)
{
	struct mtd_info *mtd = mtdblk->mbd.mtd;
	unsigned int sect_size = mtdblk->cache_size;
	size_t retlen;
	int ret;

	DEBUG(MTD_DEBUG_LEVEL2, "mtdblock: read on \"%s\" at 0x%lx, size 0x%x\n",
			mtd->name, pos, len);

	if (!sect_size)
		return mtd->read(mtd, pos, len, &retlen, buf);

	while (len > 0) {
		unsigned long sect_start = (pos/sect_size)*sect_size;
		unsigned int offset = pos - sect_start;
		unsigned int size = sect_size - offset;
		if (size > len)
			size = len;

		/*
		 * Check if the requested data is already cached
		 * Read the requested amount of data from our internal cache if it
		 * contains what we want, otherwise we read the data directly
		 * from flash.
		 */
		if (mtdblk->cache_state != STATE_EMPTY &&
		    mtdblk->cache_offset == sect_start) {
			memcpy (buf, mtdblk->cache_data + offset, size);
		} else {
			ret = mtd->read(mtd, pos, size, &retlen, buf);
			if (ret)
				return ret;
			if (retlen != size)
				return -EIO;
		}

		buf += size;
		pos += size;
		len -= size;
	}

	return 0;
}

static int mtdblock_readsect(struct mtd_blktrans_dev *dev,
			      unsigned long block, char *buf)
{
	struct mtdblk_dev *mtdblk = container_of(dev, struct mtdblk_dev, mbd);
	return do_cached_read(mtdblk, block<<9, 512, buf);
}

static int mtdblock_writesect(struct mtd_blktrans_dev *dev,
			      unsigned long block, char *buf)
{
	struct mtdblk_dev *mtdblk = container_of(dev, struct mtdblk_dev, mbd);
	if (unlikely(