| /* |
| * Copyright (c) 2012-2013 The Linux Foundation. All rights reserved. |
| * |
| * Previously licensed under the ISC license by Qualcomm Atheros, Inc. |
| * |
| * |
| * Permission to use, copy, modify, and/or distribute this software for |
| * any purpose with or without fee is hereby granted, provided that the |
| * above copyright notice and this permission notice appear in all |
| * copies. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL |
| * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED |
| * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE |
| * AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL |
| * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
| * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER |
| * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR |
| * PERFORMANCE OF THIS SOFTWARE. |
| */ |
| |
| /* |
| * This file was originally distributed by Qualcomm Atheros, Inc. |
| * under proprietary terms before Copyright ownership was assigned |
| * to the Linux Foundation. |
| */ |
| |
| /* |
| * File: $Header: //depot/software/projects/feature_branches/gen5_phase1/os/linux/classic/ap/apps/ssm/lib/aniSsmReplayCtr.c#2 $ |
| * |
| * Contains definitions of various utilities for EAPoL frame |
| * parsing and creation. |
| * |
| * Author: Mayank D. Upadhyay |
| * Date: 19-June-2002 |
| * History:- |
| * Date Modified by Modification Information |
| * ------------------------------------------------------ |
| * |
| */ |
| #include "vos_types.h" |
| #include "vos_trace.h" |
| #include <bapRsnErrors.h> |
| |
| #include <bapRsnSsmReplayCtr.h> |
| #include "vos_status.h" |
| #include "vos_memory.h" |
| #include "vos_utils.h" |
| #include "vos_packet.h" |
| |
| //#include "aniSsmUtils.h" |
| |
| /* |
| * Opaque replay counter type. Does TX and RX side replay counter |
| * tracking. On the TX side, it returns monotonically increasing values |
| * of the counter and checks that the peer returned a value matching |
| * the one we sent. On the RX side, it makes sure that the peer sent a |
| * replay counter greater than the last one seen (excepting for the |
| * first time a check is made which the application has to special case.) |
| */ |
| struct sAniSsmReplayCtr { |
| v_U8_t size; |
| v_U8_t *buf; |
| v_U32_t currentValue; |
| v_U8_t init; |
| }; |
| |
| static int |
| updateCtrBuf(tAniSsmReplayCtr *ctr); |
| |
| /** |
| * aniSsmReplayCtrCreate |
| * |
| * Creates a replay counter and initializes it for first time |
| * use. The initialization can be done randomly or with a passed in |
| * value like 0. In case this is going to be used on the RX side, it |
| * doesn't matter what the initialization is and can be optimized to |
| * a fixed value so as to avoid the overhead of obtaining a random |
| * value. |
| * |
| * @param ctrPtr a pointer that will be set to the newly allocated |
| * counter if the operation succeeds |
| * @param size the number of bytes that are desired in the counter |
| * @param initValue if this is negative and size is greater than 4, |
| * the initialization is done randomly. Otherwise, these bytes are |
| * copied into the least significant four or less octets of the |
| * counter, depending on the size of the counter. i.e., if the counter |
| * is only 2B, then the least significant 2B of initValue will be |
| * copied over. |
| * |
| * @return ANI_OK if the operation succeeds |
| */ |
| int |
| aniSsmReplayCtrCreate(v_U32_t cryptHandle, tAniSsmReplayCtr **ctrPtr, |
| v_U8_t size, |
| int initValue) |
| { |
| tAniSsmReplayCtr *ctr; |
| |
| ctr = vos_mem_malloc( sizeof(tAniSsmReplayCtr) ); |
| if( NULL == ctr ) |
| { |
| return ANI_E_MALLOC_FAILED; |
| } |
| |
| ctr->buf = vos_mem_malloc( size ); |
| if (ctr->buf == NULL) |
| { |
| VOS_ASSERT( 0 ); |
| vos_mem_free(ctr); |
| return ANI_E_MALLOC_FAILED; |
| } |
| |
| ctr->size = size; |
| |
| // We cannot randomly generate the most significant bytes if the |
| // total number of bytes is not greater than 4 (sizeof ANI_U32). |
| if (initValue < 0 && ctr->size <= 4) |
| initValue = 0; |
| |
| // If initValue is negative, initialize the ctr randomly, else |
| // initialize it to what the user specified. |
| if (initValue < 0) |
| { |
| if( !VOS_IS_STATUS_SUCCESS( vos_rand_get_bytes(cryptHandle, ctr->buf, ctr->size) ) ) |
| { |
| return ANI_ERROR; |
| } |
| } |
| else { |
| ctr->currentValue = initValue - 1; |
| } |
| |
| *ctrPtr = ctr; |
| |
| return ANI_OK; |
| } |
| |
| static int |
| updateCtrBuf(tAniSsmReplayCtr *ctr) |
| { |
| |
| v_U32_t numBytes; |
| v_U32_t offset; |
| v_U32_t tmp; |
| |
| tmp = vos_cpu_to_be32( ctr->currentValue ); |
| |
| numBytes = (4 <= ctr->size) ? 4 : ctr->size; |
| offset = 4 - numBytes; |
| vos_mem_copy(ctr->buf + ctr->size - numBytes, |
| ((v_U8_t *) &tmp) + offset, numBytes); |
| |
| return ANI_OK; |
| } |
| |
| /** |
| * aniSsmReplayCtrCmp |
| * |
| * Used to check if the passed in value is greater |
| * than, less than, or the same as the previous value. |
| * |
| * Can be used on the TX side to determine if the response to a |
| * request contains the same counter as the one in the request. |
| * |
| * Can be used on the RX side to determine if the request has a |
| * counter greater than the previous request, or if this is a |
| * retransmission of the previous request. The application should |
| * special-case the first time this is called on the RX side. |
| * |
| * @param ctr the current replay counter |
| * @param value the value to check against |
| * |
| * @return a negative value if current ctr is less than the |
| * given value, zero if they are the same, and a positive value if the |
| * current counter is greater than that of the given value. |
| */ |
| int |
| aniSsmReplayCtrCmp(tAniSsmReplayCtr *ctr, v_U8_t *value) |
| { |
| return vos_mem_compare2(ctr->buf, value, ctr->size); |
| } |
| |
| /** |
| * aniSsmReplayCtrUpdate |
| * |
| * Used on the RX side to update the value of the current replay |
| * counter to that received in the next request. Typically this is |
| * called after it is determined that this is not a retransmission, |
| * and some sort of integrity checking is done on it. |
| * |
| * @param ctr the current replay counter |
| * @param value the value that it should be set to |
| * |
| * @return ANI_OK if the operation succeeds |
| */ |
| int |
| aniSsmReplayCtrUpdate(tAniSsmReplayCtr *ctr, |
| v_U8_t *value) |
| { |
| vos_mem_copy(ctr->buf, value, ctr->size); |
| |
| return ANI_OK; |
| } |
| |
| /** |
| * aniSsmReplayCtrNext |
| * |
| * Used on the RX side to obtain the next value that should be sent |
| * with a request. After this call, the current value is incremented |
| * by one. |
| * |
| * @param ctr the current replay counter |
| * @param value where the next counter value should be copied |
| * into. The caller must allocated enough storage for this. |
| * |
| * @return ANI_OK if the operation succeeds |
| */ |
| int |
| aniSsmReplayCtrNext(tAniSsmReplayCtr *ctr, |
| v_U8_t *value) |
| { |
| ctr->currentValue++; |
| updateCtrBuf(ctr); |
| vos_mem_copy(value, ctr->buf, ctr->size); |
| |
| return ANI_OK; |
| } |
| |
| /** |
| * aniSsmReplayCtrFree |
| * |
| * Frees the replay counter context. |
| * |
| * @param ctr the replay counter to free. |
| * |
| * @return ANI_OK if the operation succeeds |
| */ |
| int |
| aniSsmReplayCtrFree(tAniSsmReplayCtr *ctr) |
| { |
| |
| if (ctr->buf != NULL) |
| vos_mem_free(ctr->buf); |
| |
| vos_mem_free(ctr); |
| |
| return ANI_OK; |
| } |