[6319] | 1 | /** @file wlan_mac_bss_info.c |
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| 2 | * @brief BSS Info Subsystem |
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| 3 | * |
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| 4 | * This contains code tracking BSS information. It also contains code for managing |
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| 5 | * the active scan state machine. |
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| 6 | * |
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| 7 | * @copyright Copyright 2014-2019, Mango Communications. All rights reserved. |
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| 8 | * Distributed under the Mango Communications Reference Design License |
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| 9 | * See LICENSE.txt included in the design archive or |
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| 10 | * at http://mangocomm.com/802.11/license |
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| 11 | * |
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| 12 | * This file is part of the Mango 802.11 Reference Design (https://mangocomm.com/802.11) |
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| 13 | */ |
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| 14 | |
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| 15 | /***************************** Include Files *********************************/ |
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| 16 | |
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| 17 | #include "wlan_mac_high_sw_config.h" |
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| 18 | |
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| 19 | #include "xil_types.h" |
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| 20 | #include "stdlib.h" |
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| 21 | #include "stdio.h" |
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| 22 | #include "wlan_platform_common.h" |
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| 23 | #include "wlan_platform_high.h" |
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| 24 | #include "xparameters.h" |
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| 25 | #include "string.h" |
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| 26 | |
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| 27 | #include "wlan_mac_pkt_buf_util.h" |
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| 28 | #include "wlan_mac_high.h" |
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| 29 | #include "wlan_mac_network_info.h" |
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| 30 | #include "wlan_mac_station_info.h" |
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| 31 | #include "wlan_mac_dl_list.h" |
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| 32 | #include "wlan_mac_802_11_defs.h" |
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| 33 | #include "wlan_mac_schedule.h" |
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| 34 | #include "wlan_mac_mgmt_tags.h" |
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| 35 | #include "wlan_mac_packet_types.h" |
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| 36 | #include "wlan_mac_common.h" |
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| 37 | #include "wlan_mac_queue.h" |
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| 38 | |
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| 39 | /*********************** Global Variable Definitions *************************/ |
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| 40 | |
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| 41 | extern platform_high_dev_info_t platform_high_dev_info; |
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| 42 | extern volatile function_ptr_t tx_queue_state_change_callback; ///< User callback for Tx queue state changes |
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| 43 | |
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| 44 | /*************************** Variable Definitions ****************************/ |
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| 45 | |
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| 46 | /// The network_info_list is stored chronologically from .first being oldest |
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| 47 | /// and .last being newest. The "find" function search from last to first |
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| 48 | /// to minimize search time for new BSSes you hear from often. |
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| 49 | static dl_list network_info_list; ///< Filled network info |
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| 50 | static dl_list network_info_free; ///< Available network info |
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| 51 | static dl_list network_info_matching_ssid_list; ///< Filled network info that match the SSID provided to wlan_mac_high_find_network_info_SSID |
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| 52 | |
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| 53 | |
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| 54 | /*************************** Functions Prototypes ****************************/ |
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| 55 | |
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| 56 | network_info_entry_t* wlan_mac_high_find_network_info_oldest(); |
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| 57 | |
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| 58 | |
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| 59 | /******************************** Functions **********************************/ |
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| 60 | |
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| 61 | void network_info_init() { |
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| 62 | |
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| 63 | u32 i; |
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| 64 | u32 num_network_info; |
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| 65 | network_info_entry_t* network_info_entry_base; |
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| 66 | |
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| 67 | dl_list_init(&network_info_free); |
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| 68 | dl_list_init(&network_info_list); |
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| 69 | dl_list_init(&network_info_matching_ssid_list); |
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| 70 | |
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| 71 | // Clear the memory in the dram used for bss_infos |
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| 72 | bzero((void*)BSS_INFO_BUFFER_BASE, BSS_INFO_BUFFER_SIZE); |
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| 73 | |
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| 74 | // The number of BSS info elements we can initialize is limited by the smaller of two values: |
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| 75 | // (1) The number of network_info_entry_t structs we can squeeze into BSS_INFO_DL_ENTRY_MEM_SIZE |
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| 76 | // (2) The number of bss_info structs we can squeeze into BSS_INFO_BUFFER_SIZE |
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| 77 | num_network_info = WLAN_MIN(BSS_INFO_DL_ENTRY_MEM_SIZE/sizeof(network_info_entry_t), BSS_INFO_BUFFER_SIZE/sizeof(network_info_t)); |
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| 78 | |
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| 79 | // At boot, every dl_entry buffer descriptor is free |
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| 80 | // To set up the doubly linked list, we exploit the fact that we know the starting state is sequential. |
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| 81 | // This matrix addressing is not safe once the queue is used. The insert/remove helper functions should be used |
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| 82 | network_info_entry_base = (network_info_entry_t*)(BSS_INFO_DL_ENTRY_MEM_BASE); |
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| 83 | |
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| 84 | for (i = 0; i < num_network_info; i++) { |
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| 85 | network_info_entry_base[i].data = (void*)(BSS_INFO_BUFFER_BASE + (i*sizeof(network_info_t))); |
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| 86 | dl_entry_insertEnd(&network_info_free, (dl_entry*)&(network_info_entry_base[i])); |
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| 87 | } |
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| 88 | |
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| 89 | xil_printf("Network Info list (len %d) placed in DRAM: using %d kB\n", num_network_info, (num_network_info*sizeof(network_info_t))/1024); |
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| 90 | |
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| 91 | return; |
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| 92 | } |
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| 93 | |
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| 94 | |
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| 95 | |
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| 96 | void network_info_init_finish(){ |
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| 97 | //Will be called after interrupts have been started. Safe to use scheduler now. |
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| 98 | wlan_mac_schedule_add_event(SCHEDULE_ID_COARSE, 10000000, SCHEDULE_REPEAT_FOREVER, (void*)network_info_timestamp_check); |
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| 99 | } |
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| 100 | |
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| 101 | |
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| 102 | |
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| 103 | inline void network_info_rx_process(void* pkt_buf_addr) { |
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| 104 | |
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| 105 | rx_frame_info_t* rx_frame_info = (rx_frame_info_t*)pkt_buf_addr; |
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| 106 | void* mac_payload = (u8*)pkt_buf_addr + PHY_RX_PKT_BUF_MPDU_OFFSET; |
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| 107 | u8* mac_payload_ptr_u8 = (u8*)mac_payload; |
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| 108 | char* ssid; |
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| 109 | u8 ssid_length; |
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| 110 | mac_header_80211* rx_80211_header = (mac_header_80211*)((void *)mac_payload_ptr_u8); |
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| 111 | network_info_entry_t* curr_network_info_entry; |
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| 112 | network_info_t* curr_network_info; |
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| 113 | u8 unicast_to_me; |
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| 114 | u8 to_multicast; |
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| 115 | u8 update_rx_power = 0; |
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| 116 | u8 update_timestamp = 0; |
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| 117 | u16 length = rx_frame_info->phy_details.length; |
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| 118 | |
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| 119 | // Determine destination of packet |
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| 120 | unicast_to_me = wlan_addr_eq(rx_80211_header->address_1, get_mac_hw_addr_wlan()); |
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| 121 | to_multicast = wlan_addr_mcast(rx_80211_header->address_1); |
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| 122 | |
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| 123 | if ((rx_frame_info->flags & RX_FRAME_INFO_FLAGS_FCS_GOOD) && (unicast_to_me || to_multicast) ) { |
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| 124 | switch(rx_80211_header->frame_control_1) { |
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| 125 | case (MAC_FRAME_CTRL1_SUBTYPE_BEACON): |
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| 126 | update_rx_power = 1; |
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| 127 | update_timestamp = 1; |
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| 128 | /* no break */ |
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| 129 | case (MAC_FRAME_CTRL1_SUBTYPE_PROBE_RESP): |
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| 130 | case (MAC_FRAME_CTRL1_SUBTYPE_ASSOC_RESP): |
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| 131 | |
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| 132 | curr_network_info_entry = wlan_mac_high_find_network_info_BSSID(rx_80211_header->address_3); |
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| 133 | |
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| 134 | if(curr_network_info_entry != NULL){ |
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| 135 | curr_network_info = curr_network_info_entry->data; |
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| 136 | |
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| 137 | // Remove entry from bss_info_list; Will be added back at the bottom of the function |
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| 138 | dl_entry_remove(&network_info_list, (dl_entry*)curr_network_info_entry); |
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| 139 | } else { |
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| 140 | // We haven't seen this BSS ID before, so we'll attempt to checkout a new dl_entry |
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| 141 | // struct from the free pool |
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| 142 | curr_network_info_entry = network_info_checkout(); |
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| 143 | |
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| 144 | if (curr_network_info_entry == NULL){ |
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| 145 | // No free dl_entry! |
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| 146 | // We'll have to reallocate the oldest entry in the filled list |
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| 147 | curr_network_info_entry = wlan_mac_high_find_network_info_oldest(); |
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| 148 | |
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| 149 | if (curr_network_info_entry != NULL) { |
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| 150 | dl_entry_remove(&network_info_list, (dl_entry*)curr_network_info_entry); |
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| 151 | } else { |
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| 152 | xil_printf("Cannot create network_info_t.\n"); |
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| 153 | return; |
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| 154 | } |
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| 155 | } |
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| 156 | |
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| 157 | curr_network_info = curr_network_info_entry->data; |
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| 158 | |
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| 159 | // Clear any old information from the network info |
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| 160 | wlan_mac_high_clear_network_info(curr_network_info); |
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| 161 | |
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| 162 | // Initialize the members stations list |
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| 163 | dl_list_init(&(curr_network_info->members)); |
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| 164 | |
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| 165 | // Copy BSSID into network_info_t struct |
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| 166 | memcpy(curr_network_info->bss_config.bssid, rx_80211_header->address_3, MAC_ADDR_LEN); |
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| 167 | |
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| 168 | // Copy BSSID into network_info_entry_t struct |
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| 169 | memcpy(curr_network_info_entry->bssid, rx_80211_header->address_3, MAC_ADDR_LEN); |
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| 170 | |
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| 171 | } |
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| 172 | |
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| 173 | // Move the packet pointer to after the header |
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| 174 | mac_payload_ptr_u8 += sizeof(mac_header_80211); |
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| 175 | |
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| 176 | if((rx_80211_header->frame_control_1 == MAC_FRAME_CTRL1_SUBTYPE_BEACON) || (rx_80211_header->frame_control_1 == MAC_FRAME_CTRL1_SUBTYPE_PROBE_RESP)){ |
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| 177 | //Set values to zero that will be updated when processing tags |
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| 178 | curr_network_info->capabilities = 0; |
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| 179 | curr_network_info->bss_config.ht_capable = 0; |
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| 180 | curr_network_info->bss_config.dtim_period = 0; |
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| 181 | |
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| 182 | // Copy beacon capabilities into bss_info struct |
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| 183 | // - Only a subset of beacon capabilities are recorded |
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| 184 | curr_network_info->capabilities |= (((beacon_probe_frame*)mac_payload_ptr_u8)->capabilities & BSS_CAPABILITIES_BEACON_MASK); |
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| 185 | |
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| 186 | // Copy beacon interval into bss_info struct |
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| 187 | curr_network_info->bss_config.beacon_interval = ((beacon_probe_frame*)mac_payload_ptr_u8)->beacon_interval; |
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| 188 | |
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| 189 | // Move the packet pointer to after the beacon/probe frame |
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| 190 | mac_payload_ptr_u8 += sizeof(beacon_probe_frame); |
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| 191 | } else { |
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| 192 | // This must be an association response |
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| 193 | mac_payload_ptr_u8 += sizeof(association_response_frame); |
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| 194 | } |
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| 195 | |
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| 196 | // Copy the channel on which this packet was received into the network_info struct |
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| 197 | // - chan_spec will be overwritten later in this function if a HT |
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| 198 | // capabilities tag is discovered |
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| 199 | curr_network_info->bss_config.chan_spec.chan_pri = rx_frame_info->channel; |
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| 200 | curr_network_info->bss_config.chan_spec.chan_type = CHAN_TYPE_BW20; |
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| 201 | |
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| 202 | |
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| 203 | // Parse the tagged parameters |
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| 204 | while( (((u32)mac_payload_ptr_u8) - ((u32)mac_payload)) < (length - WLAN_PHY_FCS_NBYTES)) { |
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| 205 | |
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| 206 | // Parse each of the tags |
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| 207 | switch(mac_payload_ptr_u8[0]){ |
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| 208 | |
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| 209 | //------------------------------------------------- |
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| 210 | case MGMT_TAG_SSID: |
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| 211 | // SSID parameter set |
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| 212 | // |
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| 213 | ssid = (char*)(&(mac_payload_ptr_u8[2])); |
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| 214 | ssid_length = WLAN_MIN(mac_payload_ptr_u8[1],SSID_LEN_MAX); |
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| 215 | |
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| 216 | memcpy(curr_network_info->bss_config.ssid, ssid, ssid_length); |
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| 217 | |
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| 218 | // Terminate the string |
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| 219 | (curr_network_info->bss_config.ssid)[ssid_length] = 0; |
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| 220 | break; |
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| 221 | |
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| 222 | //------------------------------------------------- |
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| 223 | case MGMT_TAG_HT_CAPABILITIES: |
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| 224 | curr_network_info->bss_config.ht_capable = 1; |
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| 225 | break; |
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| 226 | |
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| 227 | //------------------------------------------------- |
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| 228 | case MGMT_TAG_HT_OPERATION: |
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| 229 | curr_network_info->bss_config.chan_spec.chan_pri = mac_payload_ptr_u8[2]; |
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| 230 | if(mac_payload_ptr_u8[2] & 0x4){ |
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| 231 | // Channel widths larger than 20MHz are supported by this BSS |
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| 232 | if((mac_payload_ptr_u8[2] & 0x3) == 0x3){ |
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| 233 | //Secondary Channel is below primary channel |
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| 234 | curr_network_info->bss_config.chan_spec.chan_type = CHAN_TYPE_BW40_SEC_BELOW; |
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| 235 | } else if((mac_payload_ptr_u8[2] & 0x3) == 0x1){ |
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| 236 | //Secondary Channel is above primary channel |
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| 237 | curr_network_info->bss_config.chan_spec.chan_type = CHAN_TYPE_BW40_SEC_ABOVE; |
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| 238 | } |
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| 239 | } |
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| 240 | break; |
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| 241 | |
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| 242 | //------------------------------------------------- |
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| 243 | case MGMT_TAG_DSSS_PARAMETER_SET: |
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| 244 | // DS Parameter set (e.g. channel) |
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| 245 | curr_network_info->bss_config.chan_spec.chan_pri = mac_payload_ptr_u8[2]; |
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| 246 | break; |
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| 247 | |
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| 248 | //------------------------------------------------- |
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| 249 | case MGMT_TAG_TIM: |
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| 250 | curr_network_info->bss_config.dtim_period = mac_payload_ptr_u8[3]; |
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| 251 | break; |
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| 252 | } |
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| 253 | |
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| 254 | // Increment packet pointer to the next tag |
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| 255 | mac_payload_ptr_u8 += mac_payload_ptr_u8[1]+2; |
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| 256 | } |
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| 257 | |
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| 258 | // Update the beacon Rx power |
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| 259 | if (update_rx_power) curr_network_info->latest_beacon_rx_power = rx_frame_info->rx_power; |
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| 260 | |
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| 261 | // Update the beacon timestamp |
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| 262 | if (update_timestamp) curr_network_info->latest_beacon_rx_time = get_system_time_usec(); |
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| 263 | |
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| 264 | // TODO: Potential here for a application-specific callback on new BSS capabilities |
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| 265 | |
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| 266 | // Add network info into bss_info_list |
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| 267 | dl_entry_insertEnd(&network_info_list, (dl_entry*)curr_network_info_entry); |
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| 268 | break; |
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| 269 | |
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| 270 | |
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| 271 | //--------------------------------------------------------------------- |
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| 272 | default: |
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| 273 | // Only need to process MAC_FRAME_CTRL1_SUBTYPE_BEACON, MAC_FRAME_CTRL1_SUBTYPE_PROBE_RESP |
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| 274 | // to update BSS information. |
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| 275 | break; |
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| 276 | } |
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| 277 | } |
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| 278 | } |
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| 279 | |
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| 280 | |
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| 281 | |
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| 282 | void print_network_info(){ |
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| 283 | int iter; |
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| 284 | u32 i; |
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| 285 | network_info_entry_t* curr_network_info_entry; |
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| 286 | network_info_t* curr_network_info; |
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| 287 | |
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| 288 | i = 0; |
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| 289 | iter = network_info_list.length; |
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| 290 | curr_network_info_entry = (network_info_entry_t*)network_info_list.last; |
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| 291 | |
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| 292 | // Print the header |
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| 293 | xil_printf("************************ Network Info *************************\n"); |
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| 294 | |
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| 295 | while ((curr_network_info_entry != NULL) && (iter-- > 0)) { |
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| 296 | curr_network_info = curr_network_info_entry->data; |
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| 297 | |
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| 298 | xil_printf("[%d] SSID: %s ", i, curr_network_info->bss_config.ssid); |
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| 299 | |
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| 300 | if(curr_network_info->capabilities & BSS_CAPABILITIES_PRIVACY){ |
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| 301 | xil_printf("(*)"); |
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| 302 | } |
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| 303 | if(curr_network_info->capabilities & BSS_CAPABILITIES_IBSS){ |
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| 304 | xil_printf("(I)"); |
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| 305 | } |
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| 306 | if(curr_network_info->flags & NETWORK_FLAGS_KEEP){ |
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| 307 | xil_printf("(my BSS)"); |
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| 308 | } |
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| 309 | xil_printf("\n"); |
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| 310 | |
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| 311 | xil_printf(" BSSID: %02x-%02x-%02x-%02x-%02x-%02x\n", curr_network_info->bss_config.bssid[0], curr_network_info->bss_config.bssid[1], |
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| 312 | curr_network_info->bss_config.bssid[2], curr_network_info->bss_config.bssid[3], |
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| 313 | curr_network_info->bss_config.bssid[4], curr_network_info->bss_config.bssid[5]); |
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| 314 | xil_printf(" Channel: %d\n", wlan_mac_high_bss_channel_spec_to_radio_chan(curr_network_info->bss_config.chan_spec)); |
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| 315 | |
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| 316 | xil_printf(" DTIM Period: %d\n", curr_network_info->bss_config.dtim_period); |
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| 317 | |
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| 318 | xil_printf(" HT Capable: %d\n", curr_network_info->bss_config.ht_capable); |
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| 319 | |
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| 320 | xil_printf(" Last update: %d msec ago\n", (u32)((get_system_time_usec() - curr_network_info->latest_beacon_rx_time)/1000)); |
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| 321 | |
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| 322 | xil_printf(" Capabilities: 0x%04x\n", curr_network_info->capabilities); |
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| 323 | curr_network_info_entry = dl_entry_prev(curr_network_info_entry); |
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| 324 | i++; |
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| 325 | } |
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| 326 | } |
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| 327 | |
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| 328 | |
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| 329 | |
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| 330 | void network_info_timestamp_check() { |
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| 331 | network_info_entry_t* curr_network_info_entry; |
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| 332 | network_info_t* curr_network_info; |
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| 333 | curr_network_info_entry = (network_info_entry_t*)network_info_list.first; |
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| 334 | |
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| 335 | while(curr_network_info_entry != NULL){ |
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| 336 | curr_network_info = curr_network_info_entry->data; |
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| 337 | |
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| 338 | if((get_system_time_usec() - curr_network_info->latest_beacon_rx_time) > NETWORK_INFO_TIMEOUT_USEC){ |
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| 339 | if((curr_network_info->flags & NETWORK_FLAGS_KEEP) == 0){ |
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| 340 | wlan_mac_high_clear_network_info(curr_network_info); |
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| 341 | dl_entry_remove(&network_info_list, (dl_entry*)curr_network_info_entry); |
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| 342 | network_info_checkin(curr_network_info_entry); |
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| 343 | } |
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| 344 | } else { |
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| 345 | // Nothing after this entry is older, so it's safe to quit |
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| 346 | return; |
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| 347 | } |
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| 348 | |
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| 349 | curr_network_info_entry = dl_entry_next(curr_network_info_entry); |
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| 350 | } |
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| 351 | } |
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| 352 | |
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| 353 | |
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| 354 | |
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| 355 | network_info_entry_t* network_info_checkout(){ |
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| 356 | network_info_entry_t* network_info_entry; |
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| 357 | network_info_t* curr_network_info; |
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| 358 | |
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| 359 | if(network_info_free.length > 0){ |
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| 360 | network_info_entry = ((network_info_entry_t*)(network_info_free.first)); |
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| 361 | dl_entry_remove(&network_info_free,network_info_free.first); |
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| 362 | |
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| 363 | curr_network_info = network_info_entry->data; |
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| 364 | dl_list_init(&(curr_network_info->members)); |
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| 365 | return network_info_entry; |
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| 366 | } else { |
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| 367 | return NULL; |
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| 368 | } |
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| 369 | } |
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| 370 | |
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| 371 | void network_info_checkin(network_info_entry_t* network_info_entry){ |
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| 372 | dl_entry_insertEnd(&network_info_free, (dl_entry*)network_info_entry); |
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| 373 | return; |
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| 374 | } |
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| 375 | |
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| 376 | |
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| 377 | dl_list* wlan_mac_high_find_network_info_SSID(char* ssid){ |
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| 378 | // This function will return a pointer to a dl_list that contains every |
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| 379 | // network_info_t struct that matches the SSID argument. |
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| 380 | |
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| 381 | int iter; |
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| 382 | network_info_entry_t* curr_network_info_entry_primary_list; |
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| 383 | network_info_entry_t* curr_network_info_entry_match_list; |
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| 384 | network_info_entry_t* next_network_info_entry_match_list; |
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| 385 | network_info_t* curr_network_info; |
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| 386 | |
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| 387 | // Remove/free any members of network_info_matching_ssid_list that exist since the last time |
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| 388 | // this function was called |
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| 389 | |
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| 390 | iter = network_info_matching_ssid_list.length; |
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| 391 | curr_network_info_entry_match_list = (network_info_entry_t*)network_info_matching_ssid_list.first; |
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| 392 | |
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| 393 | while ((curr_network_info_entry_match_list != NULL) && (iter-- > 0)) { |
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| 394 | next_network_info_entry_match_list = dl_entry_next(curr_network_info_entry_match_list); |
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| 395 | dl_entry_remove(&network_info_matching_ssid_list, (dl_entry*)curr_network_info_entry_match_list); |
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| 396 | wlan_mac_high_free(curr_network_info_entry_match_list); |
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| 397 | curr_network_info_entry_match_list = next_network_info_entry_match_list; |
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| 398 | } |
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| 399 | |
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| 400 | // At this point in the code, network_info_matching_ssid_list is guaranteed to be empty. |
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| 401 | // We will fill it with new network_info_entry_t that point to existing network_info_t structs that |
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| 402 | // match the SSID argument to this function. Note: these network_info_t structs will continue |
---|
| 403 | // to be pointed to by the existing network_info_entry_t |
---|
| 404 | |
---|
| 405 | iter = network_info_list.length; |
---|
| 406 | curr_network_info_entry_primary_list = (network_info_entry_t*)network_info_list.last; |
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| 407 | |
---|
| 408 | while ((curr_network_info_entry_primary_list != NULL) && (iter-- > 0)) { |
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| 409 | curr_network_info = curr_network_info_entry_primary_list->data; |
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| 410 | |
---|
| 411 | if (strcmp(ssid, curr_network_info->bss_config.ssid) == 0) { |
---|
| 412 | curr_network_info_entry_match_list = wlan_mac_high_malloc(sizeof(network_info_entry_t)); |
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| 413 | curr_network_info_entry_match_list->data = curr_network_info; |
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| 414 | memcpy(curr_network_info_entry_match_list->bssid, curr_network_info->bss_config.bssid, MAC_ADDR_LEN); |
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| 415 | dl_entry_insertEnd(&network_info_matching_ssid_list, (dl_entry*)curr_network_info_entry_match_list); |
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| 416 | } |
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| 417 | |
---|
| 418 | curr_network_info_entry_primary_list = dl_entry_prev(curr_network_info_entry_primary_list); |
---|
| 419 | } |
---|
| 420 | |
---|
| 421 | return &network_info_matching_ssid_list; |
---|
| 422 | } |
---|
| 423 | |
---|
| 424 | |
---|
| 425 | network_info_entry_t* wlan_mac_high_find_network_info_BSSID(u8* bssid){ |
---|
| 426 | int iter; |
---|
| 427 | network_info_entry_t* curr_network_info_entry; |
---|
| 428 | |
---|
| 429 | iter = network_info_list.length; |
---|
| 430 | curr_network_info_entry = (network_info_entry_t*)network_info_list.last; |
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| 431 | |
---|
| 432 | while ((curr_network_info_entry != NULL) && (iter-- > 0)) { |
---|
| 433 | if (wlan_addr_eq(bssid,curr_network_info_entry->bssid)) { |
---|
| 434 | return curr_network_info_entry; |
---|
| 435 | } |
---|
| 436 | curr_network_info_entry = dl_entry_prev(curr_network_info_entry); |
---|
| 437 | } |
---|
| 438 | return NULL; |
---|
| 439 | } |
---|
| 440 | |
---|
| 441 | network_info_entry_t* wlan_mac_high_find_network_info_oldest(){ |
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| 442 | int iter; |
---|
| 443 | network_info_entry_t* curr_network_info_entry; |
---|
| 444 | network_info_t* curr_network_info; |
---|
| 445 | |
---|
| 446 | iter = network_info_list.length; |
---|
| 447 | curr_network_info_entry = (network_info_entry_t*)network_info_list.first; |
---|
| 448 | |
---|
| 449 | while ((curr_network_info_entry != NULL) && (iter-- > 0)) { |
---|
| 450 | curr_network_info = curr_network_info_entry->data; |
---|
| 451 | |
---|
| 452 | if ((curr_network_info->flags & NETWORK_FLAGS_KEEP) == 0) { |
---|
| 453 | return curr_network_info_entry; |
---|
| 454 | } |
---|
| 455 | |
---|
| 456 | curr_network_info_entry = dl_entry_next(curr_network_info_entry); |
---|
| 457 | } |
---|
| 458 | return NULL; |
---|
| 459 | } |
---|
| 460 | |
---|
| 461 | |
---|
| 462 | |
---|
| 463 | // Function will create a bss_info and make sure that the BSS ID is unique |
---|
| 464 | // in the bss_info list. |
---|
| 465 | // |
---|
| 466 | network_info_t* wlan_mac_high_create_network_info(u8* bssid, char* ssid, u8 chan){ |
---|
| 467 | network_info_entry_t* curr_network_info_entry; |
---|
| 468 | network_info_t* curr_network_info = NULL; |
---|
| 469 | |
---|
| 470 | curr_network_info_entry = wlan_mac_high_find_network_info_BSSID(bssid); |
---|
| 471 | |
---|
| 472 | if (curr_network_info_entry != NULL){ |
---|
| 473 | // Get the BSS info from the entry |
---|
| 474 | curr_network_info = curr_network_info_entry->data; |
---|
| 475 | |
---|
| 476 | // Remove the entry from the info list so it can be added back later |
---|
| 477 | dl_entry_remove(&network_info_list, (dl_entry*)curr_network_info_entry); |
---|
| 478 | } else { |
---|
| 479 | // Have not seen this BSS ID before; attempt to grab a new network_info_entry_t |
---|
| 480 | // struct from the free pool |
---|
| 481 | curr_network_info_entry = network_info_checkout(); |
---|
| 482 | |
---|
| 483 | if (curr_network_info_entry == NULL){ |
---|
| 484 | // No free network_info_entry_t; Re-allocate the oldest entry in the filled list |
---|
| 485 | curr_network_info_entry = wlan_mac_high_find_network_info_oldest(); |
---|
| 486 | |
---|
| 487 | if (curr_network_info_entry != NULL) { |
---|
| 488 | dl_entry_remove(&network_info_list, (dl_entry*)curr_network_info_entry); |
---|
| 489 | } else { |
---|
| 490 | xil_printf("Cannot create network_info_t.\n"); |
---|
| 491 | return NULL; |
---|
| 492 | } |
---|
| 493 | } |
---|
| 494 | |
---|
| 495 | // Get the network_info_t from the entry |
---|
| 496 | curr_network_info = curr_network_info_entry->data; |
---|
| 497 | |
---|
| 498 | // Clear any old information from the network info |
---|
| 499 | wlan_mac_high_clear_network_info(curr_network_info); |
---|
| 500 | |
---|
| 501 | // Initialize the associated stations list |
---|
| 502 | dl_list_init(&(curr_network_info->members)); |
---|
| 503 | |
---|
| 504 | // Copy the BSS ID to the network_info_t struct |
---|
| 505 | memcpy(curr_network_info->bss_config.bssid, bssid, MAC_ADDR_LEN); |
---|
| 506 | |
---|
| 507 | // Copy the BSS ID to the network_info_entry_t struct |
---|
| 508 | memcpy(curr_network_info_entry->bssid, bssid, MAC_ADDR_LEN); |
---|
| 509 | } |
---|
| 510 | |
---|
| 511 | // Update the fields of the BSS Info |
---|
| 512 | strncpy(curr_network_info->bss_config.ssid, ssid, SSID_LEN_MAX); |
---|
| 513 | curr_network_info->bss_config.chan_spec.chan_pri = chan; |
---|
| 514 | curr_network_info->bss_config.chan_spec.chan_type = CHAN_TYPE_BW20; |
---|
| 515 | curr_network_info->latest_beacon_rx_time = get_system_time_usec(); |
---|
| 516 | curr_network_info->latest_beacon_rx_power = 127; //Maximum s8 value with unrealistic power value. This let's downstream |
---|
| 517 | // processes know that no beacon has actually ever been received if they |
---|
| 518 | // see this value |
---|
| 519 | |
---|
| 520 | // |
---|
| 521 | // The following fields have their previous value retained if the were |
---|
| 522 | // in the network list (i.e. wlan_mac_high_find_bss_info_BSSID() returned |
---|
| 523 | // a non-NULL entry): |
---|
| 524 | // - latest_beacon_rx_power |
---|
| 525 | // - capabilities |
---|
| 526 | // - beacon_interval |
---|
| 527 | // - flags |
---|
| 528 | // - station_info_list |
---|
| 529 | // |
---|
| 530 | |
---|
| 531 | // Insert the updated entry into the network list |
---|
| 532 | dl_entry_insertEnd(&network_info_list, (dl_entry*)curr_network_info_entry); |
---|
| 533 | |
---|
| 534 | return curr_network_info; |
---|
| 535 | } |
---|
| 536 | |
---|
| 537 | /** |
---|
| 538 | * @brief Reset List of Networks |
---|
| 539 | * |
---|
| 540 | * Reset all BSS Info except ones flagged to be kept |
---|
| 541 | * |
---|
| 542 | * @param None |
---|
| 543 | * @return None |
---|
| 544 | */ |
---|
| 545 | void wlan_mac_high_reset_network_list(){ |
---|
| 546 | network_info_entry_t* next_network_info_entry = (network_info_entry_t*)network_info_list.first; |
---|
| 547 | network_info_entry_t* curr_network_info_entry; |
---|
| 548 | network_info_t* curr_network_info; |
---|
| 549 | int iter = network_info_list.length; |
---|
| 550 | |
---|
| 551 | while( (next_network_info_entry != NULL) && (iter-- > 0) ){ |
---|
| 552 | curr_network_info_entry = next_network_info_entry; |
---|
| 553 | next_network_info_entry = dl_entry_next(curr_network_info_entry); |
---|
| 554 | curr_network_info = curr_network_info_entry->data; |
---|
| 555 | |
---|
| 556 | if( (curr_network_info->flags & NETWORK_FLAGS_KEEP) == 0){ |
---|
| 557 | wlan_mac_high_clear_network_info(curr_network_info); |
---|
| 558 | dl_entry_remove(&network_info_list, (dl_entry*)curr_network_info_entry); |
---|
| 559 | network_info_checkin(curr_network_info_entry); |
---|
| 560 | } |
---|
| 561 | } |
---|
| 562 | } |
---|
| 563 | |
---|
| 564 | void wlan_mac_high_clear_network_info(network_info_t* info){ |
---|
| 565 | int iter; |
---|
| 566 | station_info_t* curr_station_info; |
---|
| 567 | station_info_entry_t* next_station_info_entry; |
---|
| 568 | station_info_entry_t* curr_station_info_entry; |
---|
| 569 | |
---|
| 570 | if (info != NULL){ |
---|
| 571 | // Remove any station infos |
---|
| 572 | iter = info->members.length; |
---|
| 573 | next_station_info_entry = (station_info_entry_t*)(info->members.first); |
---|
| 574 | |
---|
| 575 | if (((info->flags & NETWORK_FLAGS_KEEP) == 0) && (next_station_info_entry != NULL)) { |
---|
| 576 | xil_printf("WARNING: network_info_t not flagged to be kept but contained station_info_t entries.\n"); |
---|
| 577 | } |
---|
| 578 | |
---|
| 579 | // Set any members to ~STATION_INFO_FLAG_KEEP so the framework can remove them |
---|
| 580 | while ((next_station_info_entry != NULL) && (iter-- > 0)) { |
---|
| 581 | curr_station_info_entry = next_station_info_entry; |
---|
| 582 | next_station_info_entry = dl_entry_next(curr_station_info_entry); |
---|
| 583 | |
---|
| 584 | curr_station_info = curr_station_info_entry->data; |
---|
| 585 | |
---|
| 586 | // Remove the "keep" flag for this station_info so the framework can cleanup later. |
---|
| 587 | curr_station_info->flags &= ~STATION_INFO_FLAG_KEEP; |
---|
| 588 | network_info_remove_member(info, curr_station_info->addr); |
---|
| 589 | } |
---|
| 590 | |
---|
| 591 | |
---|
| 592 | // Clear the bss_info |
---|
| 593 | bzero(info, sizeof(network_info_t)); |
---|
| 594 | |
---|
| 595 | // Set beacon_interval to "unknown" |
---|
| 596 | info->bss_config.beacon_interval = BEACON_INTERVAL_UNKNOWN; |
---|
| 597 | } |
---|
| 598 | } |
---|
| 599 | |
---|
| 600 | station_info_t* network_info_add_member(network_info_t* network_info, u8* addr, u32 max_queue_size){ |
---|
| 601 | |
---|
| 602 | // This function always: |
---|
| 603 | // 1) keeps the ID fields of each station_info_t orthogonal, starting with the value 1 and packed such that |
---|
| 604 | // any holes are filled before larger IDs are used. |
---|
| 605 | // 2) opens a Tx queue fo this station |
---|
| 606 | // |
---|
| 607 | // Both of the above behaviors would need to be made optional before promiscuously adding station_info_t |
---|
| 608 | // into non-active network_info_t |
---|
| 609 | |
---|
| 610 | station_info_entry_t* station_info_entry = NULL; |
---|
| 611 | station_info_t* station_info = NULL; |
---|
| 612 | s16 max_existing_ID = 0; |
---|
| 613 | s16 new_ID = 0; |
---|
| 614 | u8* ones_array; |
---|
| 615 | u32 i; |
---|
| 616 | |
---|
| 617 | if(network_info == NULL) return NULL; |
---|
| 618 | |
---|
| 619 | station_info_entry = station_info_find_by_addr(addr, &(network_info->members)); |
---|
| 620 | |
---|
| 621 | // If we found a this station is already a member, return it. |
---|
| 622 | if(station_info_entry) return station_info_entry->data; |
---|
| 623 | |
---|
| 624 | // 1) Select a valid ID for this member. network_info->members is not ordered. |
---|
| 625 | // We need to, first, find any gaps in currently used IDs and fill those. If |
---|
| 626 | // no gaps exist, we will use an ID higher that the current maximum. |
---|
| 627 | station_info_entry = (station_info_entry_t*)(network_info->members.first); |
---|
| 628 | for(i = 0; i < network_info->members.length; i++){ |
---|
| 629 | max_existing_ID = WLAN_MAX(max_existing_ID, station_info_entry->data->ID); |
---|
| 630 | station_info_entry = dl_entry_next(station_info_entry); |
---|
| 631 | } |
---|
| 632 | |
---|
| 633 | if(max_existing_ID > 0){ |
---|
| 634 | ones_array = wlan_mac_high_malloc(max_existing_ID * sizeof(u8)); |
---|
| 635 | |
---|
| 636 | if(ones_array){ |
---|
| 637 | // Set ones_array to all ones |
---|
| 638 | memset(ones_array, 1, max_existing_ID * sizeof(u8)); |
---|
| 639 | |
---|
| 640 | station_info_entry = (station_info_entry_t*)(network_info->members.first); |
---|
| 641 | for(i = 0; i < network_info->members.length; i++){ |
---|
| 642 | if(station_info_entry->data->ID > 0){ |
---|
| 643 | // Mark this ID has used |
---|
| 644 | ones_array[ (station_info_entry->data->ID) - 1 ] = 0; |
---|
| 645 | } |
---|
| 646 | station_info_entry = dl_entry_next(station_info_entry); |
---|
| 647 | } |
---|
| 648 | |
---|
| 649 | //Find the first unused ID in the ones_array |
---|
| 650 | for(i = 0; i < (u32)max_existing_ID; i++){ |
---|
| 651 | if(ones_array[i]){ |
---|
| 652 | new_ID = i+1; |
---|
| 653 | break; |
---|
| 654 | } |
---|
| 655 | } |
---|
| 656 | wlan_mac_high_free(ones_array); |
---|
| 657 | } |
---|
| 658 | } |
---|
| 659 | |
---|
| 660 | if(new_ID == 0){ |
---|
| 661 | // If we didn't find any gaps in the existing IDs, we will use a new |
---|
| 662 | // maximum value. |
---|
| 663 | new_ID = max_existing_ID + 1; |
---|
| 664 | } |
---|
| 665 | |
---|
| 666 | // If not, we need to add it to the member list |
---|
| 667 | station_info = station_info_add_to_list(&(network_info->members), addr); |
---|
| 668 | |
---|
| 669 | if(station_info == NULL) return NULL; |
---|
| 670 | |
---|
| 671 | |
---|
| 672 | station_info->ID = new_ID; |
---|
| 673 | station_info->QID = queue_open(tx_queue_state_change_callback, new_ID, max_queue_size); |
---|
| 674 | |
---|
| 675 | // Initialize the latest activity timestamp |
---|
| 676 | // NOTE: This is so we don't run into a race condition when we try to check the association timeout |
---|
| 677 | // |
---|
| 678 | station_info->latest_rx_timestamp = get_system_time_usec(); |
---|
| 679 | |
---|
| 680 | // Set the last received sequence number to something invalid so we don't accidentally |
---|
| 681 | // de-duplicate the next reception if that sequence number is 0. |
---|
| 682 | station_info->latest_rx_seq = 0xFFFF; //Sequence numbers are only 12 bits long. This is intentionally invalid. |
---|
| 683 | |
---|
| 684 | return station_info; |
---|
| 685 | |
---|
| 686 | } |
---|
| 687 | |
---|
| 688 | int network_info_remove_member(network_info_t* network_info, u8* addr){ |
---|
| 689 | |
---|
| 690 | station_info_entry_t* station_info_entry; |
---|
| 691 | |
---|
| 692 | if(network_info == NULL) return WLAN_FAILURE; |
---|
| 693 | |
---|
| 694 | station_info_entry = station_info_find_by_addr(addr, &(network_info->members)); |
---|
| 695 | |
---|
| 696 | if(station_info_entry){ |
---|
| 697 | if(station_info_entry->data->QID >= 0) queue_close(station_info_entry->data->QID); |
---|
| 698 | station_info_entry->data->QID = -1; |
---|
| 699 | station_info_entry->data->ID = -1; |
---|
| 700 | station_info_remove_from_list(&(network_info->members), addr); |
---|
| 701 | return WLAN_SUCCESS; |
---|
| 702 | } else { |
---|
| 703 | return WLAN_FAILURE; |
---|
| 704 | } |
---|
| 705 | |
---|
| 706 | } |
---|
| 707 | |
---|
| 708 | inline dl_list* wlan_mac_high_get_network_info_list(){ |
---|
| 709 | return &network_info_list; |
---|
| 710 | } |
---|