/*
 * 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/log/?h=nds-private-remove&amp;id=e60df62492efd0b38e9575272d4621e6739facfd'>root</a>/<a href='/cgit.cgi/linux/net-next.git/log/net?h=nds-private-remove&amp;id=e60df62492efd0b38e9575272d4621e6739facfd'>net</a>/<a href='/cgit.cgi/linux/net-next.git/log/net/dccp?h=nds-private-remove&amp;id=e60df62492efd0b38e9575272d4621e6739facfd'>dccp</a>/<a href='/cgit.cgi/linux/net-next.git/log/net/dccp/feat.c?h=nds-private-remove&amp;id=e60df62492efd0b38e9575272d4621e6739facfd'>feat.c</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/cgit.cgi/linux/net-next.git/log/net/dccp/feat.c?h=nds-private-remove&amp;id=e60df62492efd0b38e9575272d4621e6739facfd&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>
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<tr><th>author</th><td>Vincent &lt;vincent.stehle@laposte.net&gt;</td><td class='right'>2017-01-30 15:06:43 +0100</td></tr>
<tr><th>committer</th><td>David S. Miller &lt;davem@davemloft.net&gt;</td><td class='right'>2017-01-31 13:07:40 -0500</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/netrom?h=nds-private-remove&amp;id=c73e44269369e936165f0f9b61f1f09a11dae01c'>c73e44269369e936165f0f9b61f1f09a11dae01c</a> (<a href='/cgit.cgi/linux/net-next.git/patch/net/netrom?id=c73e44269369e936165f0f9b61f1f09a11dae01c'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?h=nds-private-remove&amp;id=c73e44269369e936165f0f9b61f1f09a11dae01c'>e2188e900ba06302f8ed2746cb07edd3efbc5c35</a> /<a href='/cgit.cgi/linux/net-next.git/tree/net/netrom?h=nds-private-remove&amp;id=c73e44269369e936165f0f9b61f1f09a11dae01c'>net/netrom</a></td></tr>
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<div class='commit-subject'>net: thunderx: avoid dereferencing xcv when NULL</div><div class='commit-msg'>This fixes the following smatch and coccinelle warnings:

  drivers/net/ethernet/cavium/thunder/thunder_xcv.c:119 xcv_setup_link() error: we previously assumed 'xcv' could be null (see line 118) [smatch]
  drivers/net/ethernet/cavium/thunder/thunder_xcv.c:119:16-20: ERROR: xcv is NULL but dereferenced. [coccinelle]

Fixes: 6465859aba1e66a5 ("net: thunderx: Add RGMII interface type support")
Signed-off-by: Vincent Stehlé &lt;vincent.stehle@laposte.net&gt;
Cc: Sunil Goutham &lt;sgoutham@cavium.com&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=c73e44269369e936165f0f9b61f1f09a11dae01c'>Diffstat</a> (limited to 'net/netrom')</div><table summary='diffstat' class='diffstat'>