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
vic_provinfo_alloc(gfp_t flags,const u8 * oui,const u8 type)11 struct 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
vic_provinfo_free(struct vic_provinfo * vp)30 void vic_provinfo_free(struct vic_provinfo *vp)
31 {
32 kfree(vp);
33 }
34
vic_provinfo_add_tlv(struct vic_provinfo * vp,u16 type,u16 length,const void * value)35 int 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
vic_provinfo_size(struct vic_provinfo * vp)62 size_t vic_provinfo_size(struct vic_provinfo *vp)
63 {
64 return vp ? ntohl(vp->length) + sizeof(*vp) - sizeof(vp->num_tlvs) : 0;
65 }
66