/*
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* IE/TLV fragmentation/defragmentation support for
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* Broadcom 802.11bang Networking Device Driver
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*
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* Copyright (C) 2020, Broadcom.
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*
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* Unless you and Broadcom execute a separate written software license
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* agreement governing use of this software, this software is licensed to you
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* under the terms of the GNU General Public License version 2 (the "GPL"),
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* available at http://www.broadcom.com/licenses/GPLv2.php, with the
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* following added to such license:
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*
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* As a special exception, the copyright holders of this software give you
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* permission to link this software with independent modules, and to copy and
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* distribute the resulting executable under terms of your choice, provided that
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* you also meet, for each linked independent module, the terms and conditions of
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* the license of that module. An independent module is a module which is not
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* derived from this software. The special exception does not apply to any
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* modifications of the software.
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*
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*
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* <<Broadcom-WL-IPTag/Dual:>>
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*/
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#include <bcmutils.h>
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#include <frag.h>
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#include <802.11.h>
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/* defrag a fragmented dot11 ie/tlv. if space does not permit, return the needed
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* ie length to contain all the fragments with status BCME_BUFTOOSHORT.
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* out_len is in/out parameter, max length on input, used/required length on output
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*/
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int
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bcm_tlv_dot11_defrag(const void *buf, uint buf_len, uint8 id, bool id_ext,
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uint8 *out, uint *out_len)
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{
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int err = BCME_OK;
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const bcm_tlv_t *ie;
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uint tot_len = 0;
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uint out_left;
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/* find the ie; includes validation */
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ie = bcm_parse_tlvs_dot11(buf, buf_len, id, id_ext);
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if (!ie) {
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err = BCME_IE_NOTFOUND;
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goto done;
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}
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out_left = (out && out_len) ? *out_len : 0;
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/* first fragment */
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tot_len = id_ext ? ie->len - 1 : ie->len;
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/* copy out if output space permits */
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if (out_left < tot_len) {
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err = BCME_BUFTOOSHORT;
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out_left = 0; /* prevent further copy */
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} else {
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memcpy(out, &ie->data[id_ext ? 1 : 0], tot_len);
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out += tot_len;
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out_left -= tot_len;
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}
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/* if not fragmened or not fragmentable per 802.11 table 9-77 11md0.1 bail
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* we can introduce the latter check later
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*/
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if (ie->len != BCM_TLV_MAX_DATA_SIZE) {
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goto done;
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}
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/* adjust buf_len to length after ie including it */
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buf_len -= (uint)(((const uint8 *)ie - (const uint8 *)buf));
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/* update length from fragments, okay if no next ie */
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while ((ie = bcm_next_tlv(ie, &buf_len)) &&
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(ie->id == DOT11_MNG_FRAGMENT_ID)) {
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/* note: buf_len starts at next ie and last frag may be partial */
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if (out_left < ie->len) {
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err = BCME_BUFTOOSHORT;
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out_left = 0;
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} else {
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memcpy(out, &ie->data[0], ie->len);
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out += ie->len;
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out_left -= ie->len;
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}
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tot_len += ie->len + BCM_TLV_HDR_SIZE;
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/* all but last should be of max size */
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if (ie->len < BCM_TLV_MAX_DATA_SIZE) {
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break;
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}
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}
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done:
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if (out_len) {
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*out_len = tot_len;
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}
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return err;
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}
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int
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bcm_tlv_dot11_frag_tot_len(const void *buf, uint buf_len,
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uint8 id, bool id_ext, uint *ie_len)
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{
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return bcm_tlv_dot11_defrag(buf, buf_len, id, id_ext, NULL, ie_len);
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}
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