1 // SPDX-License-Identifier: ISC
2 /*
3 * Copyright (c) 2019 Broadcom
4 */
5
6 #include <asm/unaligned.h>
7 #include <linux/string.h>
8 #include <linux/bug.h>
9
10 #include "xtlv.h"
11
brcmf_xtlv_header_size(u16 opts)12 static int brcmf_xtlv_header_size(u16 opts)
13 {
14 int len = (int)offsetof(struct brcmf_xtlv, data);
15
16 if (opts & BRCMF_XTLV_OPTION_IDU8)
17 --len;
18 if (opts & BRCMF_XTLV_OPTION_LENU8)
19 --len;
20
21 return len;
22 }
23
brcmf_xtlv_data_size(int dlen,u16 opts)24 int brcmf_xtlv_data_size(int dlen, u16 opts)
25 {
26 int hsz;
27
28 hsz = brcmf_xtlv_header_size(opts);
29 if (opts & BRCMF_XTLV_OPTION_ALIGN32)
30 return roundup(dlen + hsz, 4);
31
32 return dlen + hsz;
33 }
34
brcmf_xtlv_pack_header(struct brcmf_xtlv * xtlv,u16 id,u16 len,const u8 * data,u16 opts)35 void brcmf_xtlv_pack_header(struct brcmf_xtlv *xtlv, u16 id, u16 len,
36 const u8 *data, u16 opts)
37 {
38 u8 *data_buf;
39 u16 mask = BRCMF_XTLV_OPTION_IDU8 | BRCMF_XTLV_OPTION_LENU8;
40
41 if (!(opts & mask)) {
42 u8 *idp = (u8 *)xtlv;
43 u8 *lenp = idp + sizeof(xtlv->id);
44
45 put_unaligned_le16(id, idp);
46 put_unaligned_le16(len, lenp);
47 data_buf = lenp + sizeof(u16);
48 } else if ((opts & mask) == mask) { /* u8 id and u8 len */
49 u8 *idp = (u8 *)xtlv;
50 u8 *lenp = idp + 1;
51
52 *idp = (u8)id;
53 *lenp = (u8)len;
54 data_buf = lenp + sizeof(u8);
55 } else if (opts & BRCMF_XTLV_OPTION_IDU8) { /* u8 id, u16 len */
56 u8 *idp = (u8 *)xtlv;
57 u8 *lenp = idp + 1;
58
59 *idp = (u8)id;
60 put_unaligned_le16(len, lenp);
61 data_buf = lenp + sizeof(u16);
62 } else if (opts & BRCMF_XTLV_OPTION_LENU8) { /* u16 id, u8 len */
63 u8 *idp = (u8 *)xtlv;
64 u8 *lenp = idp + sizeof(u16);
65
66 put_unaligned_le16(id, idp);
67 *lenp = (u8)len;
68 data_buf = lenp + sizeof(u8);
69 } else {
70 WARN(true, "Unexpected xtlv option");
71 return;
72 }
73
74 if (opts & BRCMF_XTLV_OPTION_LENU8) {
75 WARN_ON(len > 0x00ff);
76 len &= 0xff;
77 }
78
79 if (data)
80 memcpy(data_buf, data, len);
81 }
82
83
