/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * CTR: Counter mode
 *
 * Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au>
 */

#ifndef _CRYPTO_CTR_H
#define _CRYPTO_CTR_H

#include <crypto/algapi.h>
#include <crypto/internal/skcipher.h>
#include <linux/string.h>
#include <linux/types.h>

#define CTR_RFC3686_NONCE_SIZE 4
#define CTR_RFC3686_IV_SIZE 8
#define CTR_RFC3686_BLOCK_SIZE 16

static inline int crypto_ctr_encrypt_walk(struct skcipher_request *req,
					  void (*fn)(struct crypto_skcipher *,
						     const u8 *, u8 *))
{
	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
	int blocksize = crypto_skcipher_chunksize(tfm);
	u8 buf[MAX_CIPHER_BLOCKSIZE];
	struct skcipher_walk walk;
	int err;

	/* avoid integer division due to variable blocksize parameter */
	if (WARN_ON_ONCE(!is_power_of_2(blocksize)))
		return -EINVAL;

	err = skcipher_walk_virt(&walk, req, false);

	while (walk.nbytes > 0) {
		u8 *dst = walk.dst.virt.addr;
		u8 *src = walk.src.virt.addr;
		int nbytes = walk.nbytes;
		int tail = 0;

		if (nbytes < walk.total) {
			tail = walk.nbytes & (blocksize - 1);
			nbytes -= tail;
		}

		do {
			int bsize = min(nbytes, blocksize);

			fn(tfm, walk.iv, buf);

			crypto_xor_cpy(dst, src, buf, bsize);
			crypto_inc(walk.iv, blocksize);

			dst += bsize;
			src += bsize;
			nbytes -= bsize;
		} while (nbytes > 0);

		err = skcipher_walk_done(&walk, tail);
	}
	return err;
}

#endif  /* _CRYPTO_CTR_H */
rmlinux.org.uk/linux-net-next.git/log/'>log</a><a href='/cgit/git.armlinux.org.uk/linux-net-next.git/tree/?id=b7683155517c09c7e0f9d791eaab6dab3b4b2477'>tree</a><a class='active' href='/cgit/git.armlinux.org.uk/linux-net-next.git/commit/?id=b7683155517c09c7e0f9d791eaab6dab3b4b2477'>commit</a><a href='/cgit/git.armlinux.org.uk/linux-net-next.git/diff/?id=b7683155517c09c7e0f9d791eaab6dab3b4b2477'>diff</a></td><td class='form'><form class='right' method='get' action='/cgit/git.armlinux.org.uk/linux-net-next.git/log/'>
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<div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='b7683155517c09c7e0f9d791eaab6dab3b4b2477'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Edward Cree &lt;ecree@solarflare.com&gt;</td><td class='right'>2020-02-17 13:43:10 +0000</td></tr>
<tr><th>committer</th><td>David S. Miller &lt;davem@davemloft.net&gt;</td><td class='right'>2020-02-17 14:35:23 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='sha1'><a href='/cgit/git.armlinux.org.uk/linux-net-next.git/commit/?id=b7683155517c09c7e0f9d791eaab6dab3b4b2477'>b7683155517c09c7e0f9d791eaab6dab3b4b2477</a> (<a href='/cgit/git.armlinux.org.uk/linux-net-next.git/patch/?id=b7683155517c09c7e0f9d791eaab6dab3b4b2477'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='sha1'><a href='/cgit/git.armlinux.org.uk/linux-net-next.git/tree/?id=b7683155517c09c7e0f9d791eaab6dab3b4b2477'>cea3ca29b8db6619ce2b9f90695c919f0f3d1fd1</a></td></tr>
<tr><th>parent</th><td colspan='2' class='sha1'><a href='/cgit/git.armlinux.org.uk/linux-net-next.git/commit/?id=bd706ff8ea2b6e2d3f21f0863b2fc42f860f8ba2'>bd706ff8ea2b6e2d3f21f0863b2fc42f860f8ba2</a> (<a href='/cgit/git.armlinux.org.uk/linux-net-next.git/diff/?id=b7683155517c09c7e0f9d791eaab6dab3b4b2477&amp;id2=bd706ff8ea2b6e2d3f21f0863b2fc42f860f8ba2'>diff</a>)</td></tr></table>
<div class='commit-subject'>sfc: only schedule asynchronous filter work if needed</div><div class='commit-msg'>Prevent excessive CPU time spent running a workitem with nothing to do.

We avoid any races by keeping the same check in efx_filter_rfs_expire().

Suggested-by: Martin Habets &lt;mhabets@solarflare.com&gt;
Signed-off-by: Edward Cree &lt;ecree@solarflare.com&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;
</div><div class='diffstat-header'><a href='/cgit/git.armlinux.org.uk/linux-net-next.git/diff/?id=b7683155517c09c7e0f9d791eaab6dab3b4b2477'>Diffstat</a></div><table summary='diffstat' class='diffstat'>