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// SPDX-License-Identifier: ISC
/*
* Copyright (c) 2019 Broadcom
*/
#include <linux/unaligned.h>
#include <linux/math.h>
#include <linux/string.h>
#include <linux/bug.h>
#include "xtlv.h"
static int brcmf_xtlv_header_size(u16 opts)
{
int len = (int)offsetof(struct brcmf_xtlv, data);
if (opts & BRCMF_XTLV_OPTION_IDU8)
--len;
if (opts & BRCMF_XTLV_OPTION_LENU8)
--len;
return len;
}
int brcmf_xtlv_data_size(int dlen, u16 opts)
{
int hsz;
hsz = brcmf_xtlv_header_size(opts);
if (opts & BRCMF_XTLV_OPTION_ALIGN32)
return roundup(dlen + hsz, 4);
return dlen + hsz;
}
void brcmf_xtlv_pack_header(struct brcmf_xtlv *xtlv, u16 id, u16 len,
const u8 *data, u16 opts)
{
u8 *data_buf;
u16 mask = BRCMF_XTLV_OPTION_IDU8 | BRCMF_XTLV_OPTION_LENU8;
if (!(opts & mask)) {
u8 *idp = (u8 *)xtlv;
u8 *lenp = idp + sizeof(xtlv->id);
put_unaligned_le16(id, idp);
put_unaligned_le16(len, lenp);
data_buf = lenp + sizeof(u16);
} else if ((opts & mask) == mask) { /* u8 id and u8 len */
u8 *idp = (u8 *)xtlv;
u8 *lenp = idp + 1;
*idp = (u8)id;
*lenp = (u8)len;
data_buf = lenp + sizeof(u8);
} else if (opts & BRCMF_XTLV_OPTION_IDU8) { /* u8 id, u16 len */
u8 *idp = (u8 *)xtlv;
u8 *lenp = idp + 1;
*idp = (u8)id;
put_unaligned_le16(len, lenp);
data_buf = lenp + sizeof(u16);
} else if (opts & BRCMF_XTLV_OPTION_LENU8) { /* u16 id, u8 len */
u8 *idp = (u8 *)xtlv;
u8 *lenp = idp + sizeof(u16);
put_unaligned_le16(id, idp);
*lenp = (u8)len;
data_buf = lenp + sizeof(u8);
} else {
WARN(true, "Unexpected xtlv option");
return;
}
if (opts & BRCMF_XTLV_OPTION_LENU8) {
WARN_ON(len > 0x00ff);
len &= 0xff;
}
if (data)
memcpy(data_buf, data, len);
}
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