Android Wi-Fi源码分析之wpa_supplicant初始化(三):wpa_supplicant_add

路径为:external\wpa_supplicant_8\wpa_supplicant\wpa_supplicant.c

/*** wpa_supplicant_add_iface - Add a new network interface* @global: Pointer to global data from wpa_supplicant_init()* @iface: Interface configuration options* Returns: Pointer to the created interface or %NULL on failure** This function is used to add new network interfaces for %wpa_supplicant.* This can be called before wpa_supplicant_run() to add interfaces before the* main event loop has been started. In addition, new interfaces can be added* dynamically while %wpa_supplicant is already running. This could happen,* e.g., when a hotplug network adapter is inserted.*/
struct wpa_supplicant * wpa_supplicant_add_iface(struct wpa_global *global,struct wpa_interface *iface)
{struct wpa_supplicant *wpa_s;struct wpa_interface t_iface;struct wpa_ssid *ssid;if (global == NULL || iface == NULL)return NULL;wpa_s = wpa_supplicant_alloc();if (wpa_s == NULL)return NULL;wpa_s->global = global;t_iface = *iface;if (global->params.override_driver) {wpa_printf(MSG_DEBUG, "Override interface parameter: driver ""('%s' -> '%s')",iface->driver, global->params.override_driver);t_iface.driver = global->params.override_driver;}if (global->params.override_ctrl_interface) {wpa_printf(MSG_DEBUG, "Override interface parameter: ""ctrl_interface ('%s' -> '%s')",iface->ctrl_interface,global->params.override_ctrl_interface);t_iface.ctrl_interface =global->params.override_ctrl_interface;}/*重要*/if (wpa_supplicant_init_iface(wpa_s, &t_iface)) {wpa_printf(MSG_DEBUG, "Failed to add interface %s",iface->ifname);wpa_supplicant_deinit_iface(wpa_s, 0, 0);return NULL;}/* 通过dbus通知外接有新的iface加入 Notify the control interfaces about new iface */if (wpas_notify_iface_added(wpa_s)) {wpa_supplicant_deinit_iface(wpa_s, 1, 0);return NULL;}/*通过dbus通知外界有新的无线网络加入*/for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next)wpas_notify_network_added(wpa_s, ssid);/* wpa_global的ifaces变量指向一个wpa_supplicant对象,* 而wpa_supplicant又通过next变量将自己链接到一个单项链表中*/wpa_s->next = global->ifaces;global->ifaces = wpa_s;wpa_dbg(wpa_s, MSG_DEBUG, "Added interface %s", wpa_s->ifname);wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);return wpa_s;
}

wpa_supplicant_add_iface函数的内容非常丰富, 包括两个重要数据结构(wpa_supplicant和wpa_ssid)以及一个关键函数wpa_supplicant_init_iface.这些数据背景较多, 先来看看他们.

wpa_ssid结构体

wpa_ssid结构体用于存储某个无线网络的配置信息(如所支持的安全类型, 优先级等). (external\wpa_supplicant_8\wpa_supplicant\wpa_supplicant.conf)文件中的每一个network项都对应一个wpa_ssid对象.
路径为:external\wpa_supplicant_8\wpa_supplicant\config_ssid.h


/*** struct wpa_ssid - Network configuration data** This structure includes all the configuration variables for a network. This* data is included in the per-interface configuration data as an element of* the network list, struct wpa_config::ssid. Each network block in the* configuration is mapped to a struct wpa_ssid instance.* */
struct wpa_ssid {/*** next - Next network in global list** This pointer can be used to iterate over all networks. The head of* this list is stored in the ssid field of struct wpa_config.*/struct wpa_ssid *next;/*所有wpa_ssid对象都保存在一个链表当中, 头指针保存于另外一个结构体wpa_config的ssid变量中*//*** pnext - Next network in per-priority list** This pointer can be used to iterate over all networks in the same* priority class. The heads of these list are stored in the pssid* fields of struct wpa_config.*/struct wpa_ssid *pnext;/*wpa_ssid还可以按priority保存在另一个链表中, 头指针为wpa_config的ssid变量*//*** id - Unique id for the network** This identifier is used as a unique identifier for each network* block when using the control interface. Each network is allocated an* id when it is being created, either when reading the configuration* file or when a new network is added through the control interface.*/int id;/*每个无线网络都有一个唯一的编号*//*** priority - Priority group** By default, all networks will get same priority group (0). If some* of the networks are more desirable, this field can be used to change* the order in which wpa_supplicant goes through the networks when* selecting a BSS. The priority groups will be iterated in decreasing* priority (i.e., the larger the priority value, the sooner the* network is matched against the scan results). Within each priority* group, networks will be selected based on security policy, signal* strength, etc.** Please note that AP scanning with scan_ssid=1 and ap_scan=2 mode are* not using this priority to select the order for scanning. Instead,* they try the networks in the order that used in the configuration* file.*/int priority;/*该无线网络对应的priority值, 默认为0*//*** ssid - Service set identifier (network name)** This is the SSID for the network. For wireless interfaces, this is* used to select which network will be used. If set to %NULL (or* ssid_len=0), any SSID can be used. For wired interfaces, this must* be set to %NULL. Note: SSID may contain any characters, even nul* (ASCII 0) and as such, this should not be assumed to be a nul* terminated string. ssid_len defines how many characters are valid* and the ssid field is not guaranteed to be nul terminated.*/u8 *ssid;/*无线网络的名字*//*** ssid_len - Length of the SSID*/size_t ssid_len;/*ssid变量长度*//*** bssid - BSSID** If set, this network block is used only when associating with the AP* using the configured BSSID** If this is a persistent P2P group (disabled == 2), this is the GO* Device Address.*/u8 bssid[ETH_ALEN];/*用于保存bssid[ETH_ALEN]*//*** bssid_set - Whether BSSID is configured for this network*/int bssid_set;/*该无线网络是否设置了bssid变量*//*** psk - WPA pre-shared key (256 bits)*/u8 psk[32];/*数组长度为32, 用于保存WPA中的Pre-Shared Key (256位)*//*** psk_set - Whether PSK field is configured*/int psk_set;/*是否设置了上面的psk参数*//*** passphrase - WPA ASCII passphrase** If this is set, psk will be generated using the SSID and passphrase* configured for the network. ASCII passphrase must be between 8 and* 63 characters (inclusive).*/char *passphrase;/*为WPA设置ASCII字符密码*//*** ext_psk - PSK/passphrase name in external storage** If this is set, PSK/passphrase will be fetched from external storage* when requesting association with the network.*/char *ext_psk;/*** pairwise_cipher - Bitfield of allowed pairwise ciphers, WPA_CIPHER_**/int pairwise_cipher;/*用于单播数据加密的密钥类型*//*** group_cipher - Bitfield of allowed group ciphers, WPA_CIPHER_**/int group_cipher;/*用于数组数据加密的密钥类型*//*** key_mgmt - Bitfield of allowed key management protocols** WPA_KEY_MGMT_**/int key_mgmt;/*密钥管理类型*//*** bg_scan_period - Background scan period in seconds, 0 to disable, or* -1 to indicate no change to default driver configuration*/int bg_scan_period;/*** proto - Bitfield of allowed protocols, WPA_PROTO_**/int proto;/*该无线网络支持的安全保护类型*//*** auth_alg -  Bitfield of allowed authentication algorithms** WPA_AUTH_ALG_**/int auth_alg;/*该无线网络支持的身份验证类型*//*** scan_ssid - Scan this SSID with Probe Requests** scan_ssid can be used to scan for APs using hidden SSIDs.* Note: Many drivers do not support this. ap_mode=2 can be used with* such drivers to use hidden SSIDs.*/int scan_ssid;/*是否利用probe request帧扫描此ssid对应的无线网络*/#ifdef IEEE8021X_EAPOL
#define EAPOL_FLAG_REQUIRE_KEY_UNICAST BIT(0)
#define EAPOL_FLAG_REQUIRE_KEY_BROADCAST BIT(1)/*** eapol_flags - Bit field of IEEE 802.1X/EAPOL options (EAPOL_FLAG_*)*/int eapol_flags;/*EAPOL选项*//*** eap - EAP peer configuration for this network*/struct eap_peer_config eap;/*eap peer端设置信息*/
#endif /* IEEE8021X_EAPOL */#define NUM_WEP_KEYS 4
#define MAX_WEP_KEY_LEN 16/*** wep_key - WEP keys*/u8 wep_key[NUM_WEP_KEYS][MAX_WEP_KEY_LEN];/*** wep_key_len - WEP key lengths*/size_t wep_key_len[NUM_WEP_KEYS];/*** wep_tx_keyidx - Default key index for TX frames using WEP*/int wep_tx_keyidx;/*** proactive_key_caching - Enable proactive key caching** This field can be used to enable proactive key caching which is also* known as opportunistic PMKSA caching for WPA2. This is disabled (0)* by default unless default value is changed with the global okc=1* parameter. Enable by setting this to 1.** Proactive key caching is used to make supplicant assume that the APs* are using the same PMK and generate PMKSA cache entries without* doing RSN pre-authentication. This requires support from the AP side* and is normally used with wireless switches that co-locate the* authenticator.** Internally, special value -1 is used to indicate that the parameter* was not specified in the configuration (i.e., default behavior is* followed).*/int proactive_key_caching;/*** mixed_cell - Whether mixed cells are allowed** This option can be used to configure whether so called mixed cells,* i.e., networks that use both plaintext and encryption in the same* SSID, are allowed. This is disabled (0) by default. Enable by* setting this to 1.*/int mixed_cell;#ifdef IEEE8021X_EAPOL/*** leap - Number of EAP methods using LEAP** This field should be set to 1 if LEAP is enabled. This is used to* select IEEE 802.11 authentication algorithm.*/int leap;/*** non_leap - Number of EAP methods not using LEAP** This field should be set to >0 if any EAP method other than LEAP is* enabled. This is used to select IEEE 802.11 authentication* algorithm.*/int non_leap;/*** eap_workaround - EAP workarounds enabled** wpa_supplicant supports number of "EAP workarounds" to work around* interoperability issues with incorrectly behaving authentication* servers. This is recommended to be enabled by default because some* of the issues are present in large number of authentication servers.** Strict EAP conformance mode can be configured by disabling* workarounds with eap_workaround = 0.*/unsigned int eap_workaround;#endif /* IEEE8021X_EAPOL *//*** mode - IEEE 802.11 operation mode (Infrastucture/IBSS)** 0 = infrastructure (Managed) mode, i.e., associate with an AP.** 1 = IBSS (ad-hoc, peer-to-peer)** 2 = AP (access point)** 3 = P2P Group Owner (can be set in the configuration file)** 4 = P2P Group Formation (used internally; not in configuration* files)** Note: IBSS can only be used with key_mgmt NONE (plaintext and* static WEP) and key_mgmt=WPA-NONE (fixed group key TKIP/CCMP). In* addition, ap_scan has to be set to 2 for IBSS. WPA-None requires* following network block options: proto=WPA, key_mgmt=WPA-NONE,* pairwise=NONE, group=TKIP (or CCMP, but not both), and psk must also* be set (either directly or using ASCII passphrase).*/enum wpas_mode {WPAS_MODE_INFRA = 0,WPAS_MODE_IBSS = 1,WPAS_MODE_AP = 2,WPAS_MODE_P2P_GO = 3,WPAS_MODE_P2P_GROUP_FORMATION = 4,} mode;/*** disabled - Whether this network is currently disabled** 0 = this network can be used (default).* 1 = this network block is disabled (can be enabled through* ctrl_iface, e.g., with wpa_cli or wpa_gui).* 2 = this network block includes parameters for a persistent P2P* group (can be used with P2P ctrl_iface commands)*/int disabled;/*** disabled_for_connect - Whether this network was temporarily disabled** This flag is used to reenable all the temporarily disabled networks* after either the success or failure of a WPS connection.*/int disabled_for_connect;/*** peerkey -  Whether PeerKey handshake for direct links is allowed** This is only used when both RSN/WPA2 and IEEE 802.11e (QoS) are* enabled.** 0 = disabled (default)* 1 = enabled*/int peerkey;/*** id_str - Network identifier string for external scripts** This value is passed to external ctrl_iface monitors in* WPA_EVENT_CONNECTED event and wpa_cli sets this as WPA_ID_STR* environment variable for action scripts.*/char *id_str;#ifdef CONFIG_IEEE80211W/*** ieee80211w - Whether management frame protection is enabled** This value is used to configure policy for management frame* protection (IEEE 802.11w). 0 = disabled, 1 = optional, 2 = required.* This is disabled by default unless the default value has been changed* with the global pmf=1/2 parameter.** Internally, special value 3 is used to indicate that the parameter* was not specified in the configuration (i.e., default behavior is* followed).*/enum mfp_options ieee80211w;
#endif /* CONFIG_IEEE80211W *//*** frequency - Channel frequency in megahertz (MHz) for IBSS** This value is used to configure the initial channel for IBSS (adhoc)* networks, e.g., 2412 = IEEE 802.11b/g channel 1. It is ignored in* the infrastructure mode. In addition, this value is only used by the* station that creates the IBSS. If an IBSS network with the* configured SSID is already present, the frequency of the network* will be used instead of this configured value.*/int frequency;int ht40;/*** wpa_ptk_rekey - Maximum lifetime for PTK in seconds** This value can be used to enforce rekeying of PTK to mitigate some* attacks against TKIP deficiencies.*/int wpa_ptk_rekey;/*** scan_freq - Array of frequencies to scan or %NULL for all** This is an optional zero-terminated array of frequencies in* megahertz (MHz) to include in scan requests when searching for this* network. This can be used to speed up scanning when the network is* known to not use all possible channels.*/int *scan_freq;/*** bgscan - Background scan and roaming parameters or %NULL if none** This is an optional set of parameters for background scanning and* roaming within a network (ESS) in following format:* <bgscan module name>:<module parameters>*/char *bgscan;/*** ignore_broadcast_ssid - Hide SSID in AP mode** Send empty SSID in beacons and ignore probe request frames that do* not specify full SSID, i.e., require stations to know SSID.* default: disabled (0)* 1 = send empty (length=0) SSID in beacon and ignore probe request* for broadcast SSID* 2 = clear SSID (ASCII 0), but keep the original length (this may be* required with some clients that do not support empty SSID) and* ignore probe requests for broadcast SSID*/int ignore_broadcast_ssid;/*** freq_list - Array of allowed frequencies or %NULL for all** This is an optional zero-terminated array of frequencies in* megahertz (MHz) to allow for selecting the BSS. If set, scan results* that do not match any of the specified frequencies are not* considered when selecting a BSS.*/int *freq_list;/*** p2p_client_list - List of P2P Clients in a persistent group (GO)** This is a list of P2P Clients (P2P Device Address) that have joined* the persistent group. This is maintained on the GO for persistent* group entries (disabled == 2).*/u8 *p2p_client_list;/*** num_p2p_clients - Number of entries in p2p_client_list*/size_t num_p2p_clients;#ifndef P2P_MAX_STORED_CLIENTS
#define P2P_MAX_STORED_CLIENTS 100
#endif /* P2P_MAX_STORED_CLIENTS *//*** psk_list - Per-client PSKs (struct psk_list_entry)*/struct dl_list psk_list;/*** p2p_group - Network generated as a P2P group (used internally)*/int p2p_group;/*** p2p_persistent_group - Whether this is a persistent group*/int p2p_persistent_group;/*** temporary - Whether this network is temporary and not to be saved*/int temporary;/*** export_keys - Whether keys may be exported** This attribute will be set when keys are determined through* WPS or similar so that they may be exported.*/int export_keys;#ifdef ANDROID_P2P/*** assoc_retry - Number of times association should be retried.*/int assoc_retry;
#endif#ifdef CONFIG_HT_OVERRIDES/*** disable_ht - Disable HT (IEEE 802.11n) for this network** By default, use it if it is available, but this can be configured* to 1 to have it disabled.*/int disable_ht;/*** disable_ht40 - Disable HT40 for this network** By default, use it if it is available, but this can be configured* to 1 to have it disabled.*/int disable_ht40;/*** disable_sgi - Disable SGI (Short Guard Interval) for this network** By default, use it if it is available, but this can be configured* to 1 to have it disabled.*/int disable_sgi;/*** disable_max_amsdu - Disable MAX A-MSDU** A-MDSU will be 3839 bytes when disabled, or 7935* when enabled (assuming it is otherwise supported)* -1 (default) means do not apply any settings to the kernel.*/int disable_max_amsdu;/*** ampdu_factor - Maximum A-MPDU Length Exponent** Value: 0-3, see 7.3.2.56.3 in IEEE Std 802.11n-2009.*/int ampdu_factor;/*** ampdu_density - Minimum A-MPDU Start Spacing** Value: 0-7, see 7.3.2.56.3 in IEEE Std 802.11n-2009.*/int ampdu_density;/*** ht_mcs - Allowed HT-MCS rates, in ASCII hex: ffff0000...** By default (empty string): Use whatever the OS has configured.*/char *ht_mcs;
#endif /* CONFIG_HT_OVERRIDES */#ifdef CONFIG_VHT_OVERRIDES/*** disable_vht - Disable VHT (IEEE 802.11ac) for this network** By default, use it if it is available, but this can be configured* to 1 to have it disabled.*/int disable_vht;/*** vht_capa - VHT capabilities to use*/unsigned int vht_capa;/*** vht_capa_mask - mask for VHT capabilities*/unsigned int vht_capa_mask;int vht_rx_mcs_nss_1, vht_rx_mcs_nss_2,vht_rx_mcs_nss_3, vht_rx_mcs_nss_4,vht_rx_mcs_nss_5, vht_rx_mcs_nss_6,vht_rx_mcs_nss_7, vht_rx_mcs_nss_8;int vht_tx_mcs_nss_1, vht_tx_mcs_nss_2,vht_tx_mcs_nss_3, vht_tx_mcs_nss_4,vht_tx_mcs_nss_5, vht_tx_mcs_nss_6,vht_tx_mcs_nss_7, vht_tx_mcs_nss_8;
#endif /* CONFIG_VHT_OVERRIDES *//*** ap_max_inactivity - Timeout in seconds to detect STA's inactivity** This timeout value is used in AP mode to clean up inactive stations.* By default: 300 seconds.*/int ap_max_inactivity;/*** dtim_period - DTIM period in Beacon intervals* By default: 2*/int dtim_period;/*** beacon_int - Beacon interval (default: 100 TU)*/int beacon_int;/*** auth_failures - Number of consecutive authentication failures*/unsigned int auth_failures;/*** disabled_until - Network block disabled until this time if non-zero*/struct os_time disabled_until;/*** parent_cred - Pointer to parent wpa_cred entry** This pointer can be used to delete temporary networks when a wpa_cred* that was used to create them is removed. This pointer should not be* dereferences since it may not be updated in all cases.*/void *parent_cred;
};

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Android Wi-Fi源码分析之wpa_supplicant初始化(三):wpa_supplicant_add_iface函数分析

wpa_ssid结构体

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