1 // SPDX-License-Identifier: ISC
2 /*
3 * Copyright (c) 2019 Broadcom
4 */
5
6 #include <asm/unaligned.h>
7
8 #include <linux/math.h>
9 #include <linux/string.h>
10 #include <linux/bug.h>
11
12 #include "xtlv.h"
13
brcmf_xtlv_header_size(u16 opts)14 static int brcmf_xtlv_header_size(u16 opts)
15 {
16 int len = (int)offsetof(struct brcmf_xtlv, data);
17
18 if (opts & BRCMF_XTLV_OPTION_IDU8)
19 --len;
20 if (opts & BRCMF_XTLV_OPTION_LENU8)
21 --len;
22
23 return len;
24 }
25
brcmf_xtlv_data_size(int dlen,u16 opts)26 int brcmf_xtlv_data_size(int dlen, u16 opts)
27 {
28 int hsz;
29
30 hsz = brcmf_xtlv_header_size(opts);
31 if (opts & BRCMF_XTLV_OPTION_ALIGN32)
32 return roundup(dlen + hsz, 4);
33
34 return dlen + hsz;
35 }
36
brcmf_xtlv_pack_header(struct brcmf_xtlv * xtlv,u16 id,u16 len,const u8 * data,u16 opts)37 void brcmf_xtlv_pack_header(struct brcmf_xtlv *xtlv, u16 id, u16 len,
38 const u8 *data, u16 opts)
39 {
40 u8 *data_buf;
41 u16 mask = BRCMF_XTLV_OPTION_IDU8 | BRCMF_XTLV_OPTION_LENU8;
42
43 if (!(opts & mask)) {
44 u8 *idp = (u8 *)xtlv;
45 u8 *lenp = idp + sizeof(xtlv->id);
46
47 put_unaligned_le16(id, idp);
48 put_unaligned_le16(len, lenp);
49 data_buf = lenp + sizeof(u16);
50 } else if ((opts & mask) == mask) { /* u8 id and u8 len */
51 u8 *idp = (u8 *)xtlv;
52 u8 *lenp = idp + 1;
53
54 *idp = (u8)id;
55 *lenp = (u8)len;
56 data_buf = lenp + sizeof(u8);
57 } else if (opts & BRCMF_XTLV_OPTION_IDU8) { /* u8 id, u16 len */
58 u8 *idp = (u8 *)xtlv;
59 u8 *lenp = idp + 1;
60
61 *idp = (u8)id;
62 put_unaligned_le16(len, lenp);
63 data_buf = lenp + sizeof(u16);
64 } else if (opts & BRCMF_XTLV_OPTION_LENU8) { /* u16 id, u8 len */
65 u8 *idp = (u8 *)xtlv;
66 u8 *lenp = idp + sizeof(u16);
67
68 put_unaligned_le16(id, idp);
69 *lenp = (u8)len;
70 data_buf = lenp + sizeof(u8);
71 } else {
72 WARN(true, "Unexpected xtlv option");
73 return;
74 }
75
76 if (opts & BRCMF_XTLV_OPTION_LENU8) {
77 WARN_ON(len > 0x00ff);
78 len &= 0xff;
79 }
80
81 if (data)
82 memcpy(data_buf, data, len);
83 }
84
85