/*
 * net/sched/em_cmp.c	Simple packet data comparison ematch
 *
 *		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.
 *
 * Authors:	Thomas Graf <tgraf@suug.ch>
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/skbuff.h>
#include <linux/tc_ematch/tc_em_cmp.h>
#include <asm/unaligned.h>
#include <net/pkt_cls.h>

static inline int cmp_needs_transformation(struct tcf_em_cmp *cmp)
{
	return unlikely(cmp->flags & TCF_EM_CMP_TRANS);
}

static int em_cmp_match(struct sk_buff *skb, struct tcf_ematch *em,
			struct tcf_pkt_info *info)
{
	struct tcf_em_cmp *cmp = (struct tcf_em_cmp *) em->data;
	unsigned char *ptr = tcf_get_base_ptr(skb, cmp->layer) + cmp->off;
	u32 val = 0;

	if (!tcf_valid_offset(skb, ptr, cmp->align))
		return 0;

	switch (cmp->align) {
	case TCF_EM_ALIGN_U8:
		val = *ptr;
		break;

	case TCF_EM_ALIGN_U16:
		val = get_unaligned_be16(ptr);

		if (cmp_needs_transformation(cmp))
			val = be16_to_cpu(val);
		break;

	case TCF_EM_ALIGN_U32:
		/* Worth checking boundries? The branching seems
		 * to get worse. Visit again.
		 */
		val = get_unaligned_be32(ptr);

		if (cmp_needs_transformation(cmp))
			val = be32_to_cpu(val);
		break;

	default:
		return 0;
	}

	if (cmp->mask)
		val &= cmp->mask;

	switch (cmp->opnd) {
	case TCF_EM_OPND_EQ:
		return val == cmp->val;
	case TCF_EM_OPND_LT:
		return val < cmp->val;
	case TCF_EM_OPND_GT:
		return val > cmp->val;
	}

	return 0;
}

static struct tcf_ematch_ops em_cmp_ops = {
	.kind	  = TCF_EM_CMP,
	.datalen  = sizeof(struct tcf_em_cmp),
	.match	  = em_cmp_match,
	.owner	  = THIS_MODULE,
	.link	  = LIST_HEAD_INIT(em_cmp_ops.link)
};

static int __init init_em_cmp(void)
{
	return tcf_em_register(&em_cmp_ops);
}

static void __exit exit_em_cmp(void)
{
	tcf_em_unregister(&em_cmp_ops);
}

MODULE_LICENSE("GPL");

module_init(init_em_cmp);
module_exit(exit_em_cmp);

MODULE_ALIAS_TCF_EMATCH(TCF_EM_CMP);
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=7a7b5df84b6b4e5d599c7289526eed96541a0654'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net?id=7a7b5df84b6b4e5d599c7289526eed96541a0654'>net</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net/caif?id=7a7b5df84b6b4e5d599c7289526eed96541a0654'>caif</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net/caif/Makefile?id=7a7b5df84b6b4e5d599c7289526eed96541a0654'>Makefile</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='7a7b5df84b6b4e5d599c7289526eed96541a0654'/><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>Johan Hovold &lt;johan@kernel.org&gt;</td><td class='right'>2017-01-30 11:26:38 +0100</td></tr>
<tr><th>committer</th><td>Jiri Kosina &lt;jkosina@suse.cz&gt;</td><td class='right'>2017-01-31 12:59:32 +0100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/caif/Makefile?id=7a7b5df84b6b4e5d599c7289526eed96541a0654'>7a7b5df84b6b4e5d599c7289526eed96541a0654</a> (<a href='/cgit.cgi/linux/net-next.git/patch/net/caif/Makefile?id=7a7b5df84b6b4e5d599c7289526eed96541a0654'>patch</a>)</td></tr>
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<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/caif/Makefile?id=877a021e08ccb6434718c0cc781fdf943c884cc0'>877a021e08ccb6434718c0cc781fdf943c884cc0</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/caif/Makefile?id=7a7b5df84b6b4e5d599c7289526eed96541a0654&amp;id2=877a021e08ccb6434718c0cc781fdf943c884cc0'>diff</a>)</td></tr></table>
<div class='commit-subject'>HID: cp2112: fix sleep-while-atomic</div><div class='commit-msg'>A recent commit fixing DMA-buffers on stack added a shared transfer
buffer protected by a spinlock. This is broken as the USB HID request
callbacks can sleep. Fix this up by replacing the spinlock with a mutex.

Fixes: 1ffb3c40ffb5 ("HID: cp2112: make transfer buffers DMA capable")
Cc: stable &lt;stable@vger.kernel.org&gt;	# 4.9
Signed-off-by: Johan Hovold &lt;johan@kernel.org&gt;
Reviewed-by: Benjamin Tissoires &lt;benjamin.tissoires@redhat.com&gt;
Signed-off-by: Jiri Kosina &lt;jkosina@suse.cz&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=7a7b5df84b6b4e5d599c7289526eed96541a0654'>Diffstat</a> (limited to 'net/caif/Makefile')</div><table summary='diffstat' class='diffstat'>next.git/commit/net/ipv4?h=nds-private-remove&amp;id=cb9c68363efb6d1f950ec55fb06e031ee70db5fc'>skbuff: add and use skb_nfct helper</a></td><td>Florian Westphal</td><td>4</td><td><span class='deletions'>-8</span>/<span class='insertions'>+8</span></td></tr>
<tr><td><span title='2017-02-02 14:31:51 +0100'>2017-02-02</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/net/ipv4?h=nds-private-remove&amp;id=6e10148c5c85629832d9156f337cbf67e96b69fe'>netfilter: reset netfilter state when duplicating packet</a></td><td>Florian Westphal</td><td>1</td><td><span class='deletions'>-1</span>/<span class='insertions'>+1</span></td></tr>
<tr><td><span title='2017-02-02 14:31:51 +0100'>2017-02-02</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/net/ipv4?h=nds-private-remove&amp;id=11df4b760f11ca7528c62b1c4b870735d1c62116'>netfilter: conntrack: no need to pass ctinfo to error handler</a></td><td>Florian Westphal</td><td>1</td><td><span class='deletions'>-6</span>/<span class='insertions'>+6</span></td></tr>