diff options
Diffstat (limited to 'lib/scanmerge.c')
| -rw-r--r-- | lib/scanmerge.c | 343 |
1 files changed, 343 insertions, 0 deletions
diff --git a/lib/scanmerge.c b/lib/scanmerge.c new file mode 100644 index 00000000..36f17a2c --- /dev/null +++ b/lib/scanmerge.c @@ -0,0 +1,343 @@ +/* + * Copyright (C) 2008 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +/*-------------------------------------------------------------------*/ +#include "includes.h" +#include "scanmerge.h" +#include "shlist.h" + +#define IS_HIDDEN_AP(a) (((a)->ssid_len == 0) || ((a)->ssid[0] == '\0')) + +scan_ssid_t *scan_get_ssid( scan_result_t *res_ptr ) +{ + static scan_ssid_t ssid_temp; +#ifdef WPA_SUPPLICANT_VER_0_6_X + const u8 *res_ie; + + res_ie = wpa_scan_get_ie(res_ptr, WLAN_EID_SSID); + if (!res_ie) + return NULL; + ssid_temp.ssid_len = (size_t)res_ie[1]; + os_memcpy(ssid_temp.ssid, (res_ie + 2), ssid_temp.ssid_len); +#else + ssid_temp.ssid_len = res_ptr->ssid_len; + os_memcpy(ssid_temp.ssid, res_ptr->ssid, ssid_temp.ssid_len); +#endif + return &ssid_temp; +} + +/*----------------------------------------------------------------------------- +Routine Name: scan_init +Routine Description: Inits scan merge list +Arguments: + mydrv - pointer to private driver data structure +Return Value: +-----------------------------------------------------------------------------*/ +void scan_init( struct wpa_driver_ti_data *mydrv ) +{ + mydrv->last_scan = -1; + shListInitList(&(mydrv->scan_merge_list)); +} + +/*----------------------------------------------------------------------------- +Routine Name: scan_free +Routine Description: Frees scan structure private data +Arguments: + ptr - pointer to private data structure +Return Value: +-----------------------------------------------------------------------------*/ +static void scan_free( void *ptr ) +{ + os_free(ptr); +} + +/*----------------------------------------------------------------------------- +Routine Name: scan_exit +Routine Description: Cleans scan merge list +Arguments: + mydrv - pointer to private driver data structure +Return Value: +-----------------------------------------------------------------------------*/ +void scan_exit( struct wpa_driver_ti_data *mydrv ) +{ + shListDelAllItems(&(mydrv->scan_merge_list), scan_free); +} + +/*----------------------------------------------------------------------------- +Routine Name: scan_count +Routine Description: Gives number of list elements +Arguments: + mydrv - pointer to private driver data structure +Return Value: Number of elements in the list +-----------------------------------------------------------------------------*/ +unsigned long scan_count( struct wpa_driver_ti_data *mydrv ) +{ + return shListGetCount(&(mydrv->scan_merge_list)); +} + +/*----------------------------------------------------------------------------- +Routine Name: scan_equal +Routine Description: Compares bssid of scan result and scan merge structure +Arguments: + val - pointer to scan result structure + idata - pointer to scan merge structure +Return Value: 1 - if equal, 0 - if not +-----------------------------------------------------------------------------*/ +static int scan_equal( void *val, void *idata ) +{ + scan_ssid_t n_ssid, l_ssid, *p_ssid; + scan_result_t *new_res = (scan_result_t *)val; + scan_result_t *lst_res = + (scan_result_t *)(&(((scan_merge_t *)idata)->scanres)); + int ret; + size_t len; + + p_ssid = scan_get_ssid(new_res); + if (!p_ssid) + return 0; + os_memcpy(&n_ssid, p_ssid, sizeof(scan_ssid_t)); + p_ssid = scan_get_ssid(lst_res); + if (!p_ssid) + return 0; + os_memcpy(&l_ssid, p_ssid, sizeof(scan_ssid_t)); + + len = (IS_HIDDEN_AP(&n_ssid) || IS_HIDDEN_AP(&l_ssid)) ? + 0 : n_ssid.ssid_len; + ret = ((l_ssid.ssid_len != n_ssid.ssid_len) && (len != 0)) || + (os_memcmp(new_res->bssid, lst_res->bssid, ETH_ALEN) || + os_memcmp(n_ssid.ssid, l_ssid.ssid, len)); + return !ret; +} + +/*----------------------------------------------------------------------------- +Routine Name: copy_scan_res +Routine Description: copies scan result structure to scan merge list item +Arguments: + dst - pointer to scan result structure in the list + src - source pointer to scan result structure +Return Value: NONE +-----------------------------------------------------------------------------*/ +void copy_scan_res( scan_result_t *dst, scan_result_t *src ) +{ +#ifdef WPA_SUPPLICANT_VER_0_5_X + if( IS_HIDDEN_AP(src) ) { + os_memcpy(src->ssid, dst->ssid, dst->ssid_len); + src->ssid_len = dst->ssid_len; + } +#endif + os_memcpy(dst, src, sizeof(scan_result_t)); +} + +/*----------------------------------------------------------------------------- +Routine Name: scan_add +Routine Description: adds scan result structure to scan merge list +Arguments: + head - pointer to scan merge list head + res_ptr - pointer to scan result structure +Return Value: Pointer to scan merge item +-----------------------------------------------------------------------------*/ +static scan_merge_t *scan_add( SHLIST *head, scan_result_t *res_ptr ) +{ + scan_merge_t *scan_ptr; + unsigned size = 0; + +#ifdef WPA_SUPPLICANT_VER_0_6_X + size += res_ptr->ie_len; +#endif + scan_ptr = (scan_merge_t *)os_malloc(sizeof(scan_merge_t) + size); + if( !scan_ptr ) + return( NULL ); + os_memcpy(&(scan_ptr->scanres), res_ptr, sizeof(scan_result_t) + size); + scan_ptr->count = SCAN_MERGE_COUNT; + shListInsLastItem(head, (void *)scan_ptr); + return scan_ptr; +} + +/*----------------------------------------------------------------------------- +Routine Name: scan_find +Routine Description: Looks for scan merge item in scan results array +Arguments: + scan_ptr - pointer to scan merge item + results - pointer to scan results array + number_items - current number of items +Return Value: 1 - if item was found, 0 - otherwise +-----------------------------------------------------------------------------*/ +static int scan_find( scan_merge_t *scan_ptr, scan_result_t *results, + unsigned int number_items ) +{ + unsigned int i; + + for(i=0;( i < number_items );i++) { + if( scan_equal(&(results[i]), scan_ptr) ) + return 1; + } + return 0; +} + +#ifdef WPA_SUPPLICANT_VER_0_6_X +/*----------------------------------------------------------------------------- +Routine Name: scan_dup +Routine Description: Create copy of scan results entry +Arguments: + res_ptr - pointer to scan result item +Return Value: pointer to new scan result item, or NULL +-----------------------------------------------------------------------------*/ +static scan_result_t *scan_dup( scan_result_t *res_ptr ) +{ + unsigned size; + scan_result_t *new_ptr; + + if (!res_ptr) + return NULL; + + size = sizeof(scan_result_t) + res_ptr->ie_len; + new_ptr = os_malloc(size); + if (!new_ptr) + return NULL; + if (res_ptr) { + os_memcpy(new_ptr, res_ptr, size); + } + return new_ptr; +} +#endif + +/*----------------------------------------------------------------------------- +Routine Name: scan_merge +Routine Description: Merges current scan results with previous +Arguments: + mydrv - pointer to private driver data structure + results - pointer to scan results array + number_items - current number of items + max_size - maximum namber of items +Return Value: Merged number of items +-----------------------------------------------------------------------------*/ +#ifdef WPA_SUPPLICANT_VER_0_6_X +unsigned int scan_merge( struct wpa_driver_ti_data *mydrv, + scan_result_t **results, int force_flag, + unsigned int number_items, unsigned int max_size ) +#else +unsigned int scan_merge( struct wpa_driver_ti_data *mydrv, + scan_result_t *results, int force_flag, + unsigned int number_items, unsigned int max_size ) +#endif +{ + SHLIST *head = &(mydrv->scan_merge_list); + SHLIST *item, *del_item; + scan_result_t *res_ptr; + scan_merge_t *scan_ptr; + unsigned int i; + + /* Prepare items for removal */ + item = shListGetFirstItem(head); + while( item != NULL ) { + scan_ptr = (scan_merge_t *)(item->data); + if( scan_ptr->count != 0 ) + scan_ptr->count--; + item = shListGetNextItem(head, item); + } + + for(i=0;( i < number_items );i++) { /* Find/Add new items */ +#ifdef WPA_SUPPLICANT_VER_0_6_X + res_ptr = results[i]; +#else + res_ptr = &(results[i]); +#endif + item = shListFindItem( head, res_ptr, scan_equal ); + if( item ) { +#ifdef WPA_SUPPLICANT_VER_0_6_X + scan_ssid_t *p_ssid; + scan_result_t *new_ptr; +#endif + scan_ptr = (scan_merge_t *)(item->data); + copy_scan_res(&(scan_ptr->scanres), res_ptr); + scan_ptr->count = SCAN_MERGE_COUNT; +#ifdef WPA_SUPPLICANT_VER_0_6_X + p_ssid = scan_get_ssid(res_ptr); + if (p_ssid && IS_HIDDEN_AP(p_ssid)) { + new_ptr = scan_dup(res_ptr); + if (new_ptr) { + results[i] = new_ptr; + os_free(res_ptr); + } + } +#endif + } + else { + scan_add(head, res_ptr); + } + } + + item = shListGetFirstItem( head ); /* Add/Remove missing items */ + while( item != NULL ) { + del_item = NULL; + scan_ptr = (scan_merge_t *)(item->data); + if( scan_ptr->count != SCAN_MERGE_COUNT ) { + if( !force_flag && ((scan_ptr->count == 0) || + (mydrv->last_scan == SCAN_TYPE_NORMAL_ACTIVE)) ) { + del_item = item; + } + else { + if( number_items < max_size ) { +#ifdef WPA_SUPPLICANT_VER_0_6_X + res_ptr = scan_dup(&(scan_ptr->scanres)); + if (res_ptr) { + results[number_items] = res_ptr; + number_items++; + } +#else + os_memcpy(&(results[number_items]), + &(scan_ptr->scanres), sizeof(scan_result_t)); + number_items++; +#endif + } + } + } + item = shListGetNextItem(head, item); + shListDelItem(head, del_item, scan_free); + } + + return( number_items ); +} + +/*----------------------------------------------------------------------------- +Routine Name: scan_get_by_bssid +Routine Description: Gets scan_result pointer to item by bssid +Arguments: + mydrv - pointer to private driver data structure + bssid - pointer to bssid value +Return Value: pointer to scan_result item +-----------------------------------------------------------------------------*/ +scan_result_t *scan_get_by_bssid( struct wpa_driver_ti_data *mydrv, u8 *bssid ) +{ + SHLIST *head = &(mydrv->scan_merge_list); + SHLIST *item; + scan_result_t *cur_res; + scan_ssid_t *p_ssid; + + item = shListGetFirstItem(head); + if( item == NULL ) + return( NULL ); + do { + cur_res = (scan_result_t *)&(((scan_merge_t *)(item->data))->scanres); + p_ssid = scan_get_ssid(cur_res); + if( (!os_memcmp(cur_res->bssid, bssid, ETH_ALEN)) && + (!IS_HIDDEN_AP(p_ssid)) ) { + return( cur_res ); + } + item = shListGetNextItem(head, item); + } while( item != NULL ); + + return( NULL ); +} |