[linux-block.git] / net / sched / em_u32.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * net/sched/em_u32.c	U32 Ematch
 *
 * Authors:	Thomas Graf <tgraf@suug.ch>
 *		Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
 *
 * Based on net/sched/cls_u32.c
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/skbuff.h>
#include <net/pkt_cls.h>

static int em_u32_match(struct sk_buff *skb, struct tcf_ematch *em,
			struct tcf_pkt_info *info)
{
	struct tc_u32_key *key = (struct tc_u32_key *) em->data;
	const unsigned char *ptr = skb_network_header(skb);

	if (info) {
		if (info->ptr)
			ptr = info->ptr;
		ptr += (info->nexthdr & key->offmask);
	}

	ptr += key->off;

	if (!tcf_valid_offset(skb, ptr, sizeof(u32)))
		return 0;

	return !(((*(__be32 *) ptr)  ^ key->val) & key->mask);
}

static struct tcf_ematch_ops em_u32_ops = {
	.kind	  = TCF_EM_U32,
	.datalen  = sizeof(struct tc_u32_key),
	.match	  = em_u32_match,
	.owner	  = THIS_MODULE,
	.link	  = LIST_HEAD_INIT(em_u32_ops.link)
};

static int __init init_em_u32(void)
{
	return tcf_em_register(&em_u32_ops);
}

static void __exit exit_em_u32(void)
{
	tcf_em_unregister(&em_u32_ops);
}

MODULE_LICENSE("GPL");

module_init(init_em_u32);
module_exit(exit_em_u32);

MODULE_ALIAS_TCF_EMATCH(TCF_EM_U32);
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4 LT	2	/*
	3	* net/sched/em_u32.c U32 Ematch
	4	*
1da177e4 LT	5	* Authors: Thomas Graf <tgraf@suug.ch>
	6	* Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
	7	*
	8	* Based on net/sched/cls_u32.c
	9	*/
	10
1da177e4 LT	11	#include <linux/module.h>
	12	#include <linux/types.h>
	13	#include <linux/kernel.h>
	14	#include <linux/skbuff.h>
	15	#include <net/pkt_cls.h>
	16
	17	static int em_u32_match(struct sk_buff skb, struct tcf_ematch em,
	18	struct tcf_pkt_info *info)
	19	{
	20	struct tc_u32_key key = (struct tc_u32_key ) em->data;
d56f90a7	21	const unsigned char *ptr = skb_network_header(skb);
10297b99	22
1da177e4 LT	23	if (info) {
	24	if (info->ptr)
	25	ptr = info->ptr;
	26	ptr += (info->nexthdr & key->offmask);
	27	}
	28
	29	ptr += key->off;
	30
	31	if (!tcf_valid_offset(skb, ptr, sizeof(u32)))
	32	return 0;
10297b99	33
cc7ec456	34	return !((((__be32 ) ptr) ^ key->val) & key->mask);
1da177e4 LT	35	}
	36
	37	static struct tcf_ematch_ops em_u32_ops = {
	38	.kind = TCF_EM_U32,
	39	.datalen = sizeof(struct tc_u32_key),
	40	.match = em_u32_match,
	41	.owner = THIS_MODULE,
	42	.link = LIST_HEAD_INIT(em_u32_ops.link)
	43	};
	44
	45	static int __init init_em_u32(void)
	46	{
	47	return tcf_em_register(&em_u32_ops);
	48	}
	49
10297b99	50	static void __exit exit_em_u32(void)
1da177e4 LT	51	{
	52	tcf_em_unregister(&em_u32_ops);
	53	}
	54
	55	MODULE_LICENSE("GPL");
	56
	57	module_init(init_em_u32);
	58	module_exit(exit_em_u32);
db3d99c0 PM	59
db3d99c0 PM	60	MODULE_ALIAS_TCF_EMATCH(TCF_EM_U32);