1 /*
2  * Copyright 2010 Cisco Systems, Inc.  All rights reserved.
3  *
4  * This program is free software; you may redistribute it and/or modify
5  * it under the terms of the GNU General Public License as published by
6  * the Free Software Foundation; version 2 of the License.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
9  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
10  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
11  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
12  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
13  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
14  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
15  * SOFTWARE.
16  *
17  */
18 
19 #include <linux/kernel.h>
20 #include <linux/errno.h>
21 #include <linux/types.h>
22 #include <linux/slab.h>
23 
24 #include "vnic_vic.h"
25 
26 struct vic_provinfo *vic_provinfo_alloc(gfp_t flags, const u8 *oui,
27 	const u8 type)
28 {
29 	struct vic_provinfo *vp;
30 
31 	if (!oui)
32 		return NULL;
33 
34 	vp = kzalloc(VIC_PROVINFO_MAX_DATA, flags);
35 	if (!vp)
36 		return NULL;
37 
38 	memcpy(vp->oui, oui, sizeof(vp->oui));
39 	vp->type = type;
40 	vp->length = htonl(sizeof(vp->num_tlvs));
41 
42 	return vp;
43 }
44 
45 void vic_provinfo_free(struct vic_provinfo *vp)
46 {
47 	kfree(vp);
48 }
49 
50 int vic_provinfo_add_tlv(struct vic_provinfo *vp, u16 type, u16 length,
51 	const void *value)
52 {
53 	struct vic_provinfo_tlv *tlv;
54 
55 	if (!vp || !value)
56 		return -EINVAL;
57 
58 	if (ntohl(vp->length) + offsetof(struct vic_provinfo_tlv, value) +
59 		length > VIC_PROVINFO_MAX_TLV_DATA)
60 		return -ENOMEM;
61 
62 	tlv = (struct vic_provinfo_tlv *)((u8 *)vp->tlv +
63 		ntohl(vp->length) - sizeof(vp->num_tlvs));
64 
65 	tlv->type = htons(type);
66 	tlv->length = htons(length);
67 	memcpy(tlv->value, value, length);
68 
69 	vp->num_tlvs = htonl(ntohl(vp->num_tlvs) + 1);
70 	vp->length = htonl(ntohl(vp->length) +
71 		offsetof(struct vic_provinfo_tlv, value) + length);
72 
73 	return 0;
74 }
75 
76 size_t vic_provinfo_size(struct vic_provinfo *vp)
77 {
78 	return vp ?  ntohl(vp->length) + sizeof(*vp) - sizeof(vp->num_tlvs) : 0;
79 }
80