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