drivers/net/ethernet/cisco/enic/vnic_vic.c

// SPDX-License-Identifier: GPL-2.0-only
// Copyright 2010 Cisco Systems, Inc.  All rights reserved.

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/slab.h>

#include "vnic_vic.h"

struct vic_provinfo *vic_provinfo_alloc(gfp_t flags, const u8 *oui,
	const u8 type)
{
	struct vic_provinfo *vp;

	if (!oui)
		return NULL;

	vp = kzalloc(VIC_PROVINFO_MAX_DATA, flags);
	if (!vp)
		return NULL;

	memcpy(vp->oui, oui, sizeof(vp->oui));
	vp->type = type;
	vp->length = htonl(sizeof(vp->num_tlvs));

	return vp;
}

void vic_provinfo_free(struct vic_provinfo *vp)
{
	kfree(vp);
}

int vic_provinfo_add_tlv(struct vic_provinfo *vp, u16 type, u16 length,
	const void *value)
{
	struct vic_provinfo_tlv *tlv;

	if (!vp || !value)
		return -EINVAL;

	if (ntohl(vp->length) + offsetof(struct vic_provinfo_tlv, value) +
		length > VIC_PROVINFO_MAX_TLV_DATA)
		return -ENOMEM;

	tlv = (struct vic_provinfo_tlv *)((u8 *)vp->tlv +
		ntohl(vp->length) - sizeof(vp->num_tlvs));

	tlv->type = htons(type);
	tlv->length = htons(length);
	unsafe_memcpy(tlv->value, value, length,
		      /* Flexible array of flexible arrays */);

	vp->num_tlvs = htonl(ntohl(vp->num_tlvs) + 1);
	vp->length = htonl(ntohl(vp->length) +
		offsetof(struct vic_provinfo_tlv, value) + length);

	return 0;
}

size_t vic_provinfo_size(struct vic_provinfo *vp)
{
	return vp ?  ntohl(vp->length) + sizeof(*vp) - sizeof(vp->num_tlvs) : 0;
}