1// SPDX-License-Identifier: GPL-2.0-only
2// Copyright 2010 Cisco Systems, Inc.  All rights reserved.
3
4#include <linux/kernel.h>
5#include <linux/errno.h>
6#include <linux/types.h>
7#include <linux/slab.h>
8
9#include "vnic_vic.h"
10
11struct vic_provinfo *vic_provinfo_alloc(gfp_t flags, const u8 *oui,
12	const u8 type)
13{
14	struct vic_provinfo *vp;
15
16	if (!oui)
17		return NULL;
18
19	vp = kzalloc(VIC_PROVINFO_MAX_DATA, flags);
20	if (!vp)
21		return NULL;
22
23	memcpy(vp->oui, oui, sizeof(vp->oui));
24	vp->type = type;
25	vp->length = htonl(sizeof(vp->num_tlvs));
26
27	return vp;
28}
29
30void vic_provinfo_free(struct vic_provinfo *vp)
31{
32	kfree(vp);
33}
34
35int vic_provinfo_add_tlv(struct vic_provinfo *vp, u16 type, u16 length,
36	const void *value)
37{
38	struct vic_provinfo_tlv *tlv;
39
40	if (!vp || !value)
41		return -EINVAL;
42
43	if (ntohl(vp->length) + offsetof(struct vic_provinfo_tlv, value) +
44		length > VIC_PROVINFO_MAX_TLV_DATA)
45		return -ENOMEM;
46
47	tlv = (struct vic_provinfo_tlv *)((u8 *)vp->tlv +
48		ntohl(vp->length) - sizeof(vp->num_tlvs));
49
50	tlv->type = htons(type);
51	tlv->length = htons(length);
52	unsafe_memcpy(tlv->value, value, length,
53		      /* Flexible array of flexible arrays */);
54
55	vp->num_tlvs = htonl(ntohl(vp->num_tlvs) + 1);
56	vp->length = htonl(ntohl(vp->length) +
57		offsetof(struct vic_provinfo_tlv, value) + length);
58
59	return 0;
60}
61
62size_t vic_provinfo_size(struct vic_provinfo *vp)
63{
64	return vp ?  ntohl(vp->length) + sizeof(*vp) - sizeof(vp->num_tlvs) : 0;
65}
66