下面我们将接上一篇文章继续分析main中第二个关键函数wpa_supplicant_add_iface。
wpa_supplicant_add_iface用于向wpa_supplicant添加接口设备。所谓的添加（add iface),其实就是初始化这些设备。
[wpa_supplicant.c::wpa_supplicant_add_iface]
[cpp] view plain copy 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; } 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; } /* Notify the control interfaces about new iface */ if (wpas_notify_iface_added(wpa_s)) { wpa_supplicant_deinit_iface(wpa_s, 1, 0); return NULL; } for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) wpas_notify_network_added(wpa_s, ssid); 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.
1、wpa_ssid结构体
wpa_ssid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）它其实是wpa_supplicant.conf中无线网络配置项在代码中的反映（conf文件中每一个network项都对应一个wpa_ssid对象）。它的一些主要数据成员如下所示：
struct wpa_ssid+next：struct wpa_ssid* //所有wpa_ssid对象都保存在一个链表中，头指针保存于另外一个结构体wpa_config的变量中 +pnext:struct wpa_ssid* //wpa_ssid还可按priority保存在另一个链表中，头指针为wpa_config的pssid变量 +id:int //每一个无线网络都有一个唯一的编号 +priority:int //该无线对应的priority值，默认为0 +ssid：8*：此无线网络的ssid（即无线网络名） +ssid_len:size_t //ssid变量的长度 +bssid:u8数组 //用于保存bssid，数组长度为ETH_ALEN(值为6） +bssid_set: //该无线网络是否设置了bssid变量 +psk：u8数组 //数组长度为32，用于保存WPA中的Pre-Shared Key +psk_set: int //是否设置了商数的psk参数 +passphrase:char* //为WPA设置了ASCII字符密码。 +pairwise_cipher:int //用于单播数据加密的密钥对类型 +group_cipher: int //用于组播数据加密的密钥对类型 +key_mgmt:int //密钥管理类型 +proto:int //该无线网络支持的安全保护类型 +auth_alg:int //该无线网络支持的身份验证类型 +scan_ssid:int //是否利用probe request帧扫描此ssid对应的无线网络 +eapol_flags:int //EAPOL选项 +eap:struct eap_peer_config //eap peer端设置信息 +proactive_key_caching:int // +mode:enum wpas_mode // +disabled:int //wpa_ssid定义的wpas_mode枚举变量 enum wpas_mode{ WPAS_MODE_INFRA = 0，//代表基础结构网络的STA WPAS_MODE_IBSS = 1，//代表IBSS网络的模式 WPAS_MODE_AP = 2，代表基础结构网络中的AP WPAS_MODE_P2P_GO = 3，//P2P相关 WPAS_MODE_GROUP_FORMATION = 4， }mode;
上表格中一些数据成员非常重要，下面分别介绍：
（1）安全相关成员变量
1）passphrase：该变量只和WPA/WPA2-PSK模式有关，用于存储我们输入的字符串密码。
2）pairwise_cipher和group_cipher：这两个变量和规范中的cipher suite定义有关。
[cpp] view plain copy #define WPA_CIPHER_NONE BIT(0)<span style="white-space:pre"> </span>//不保护 #define WPA_CIPHER_WEP40 BIT(1)<span style="white-space:pre"> </span>//WEP40 #define WPA_CIPHER_WEP104 BIT(2)<span style="white-space:pre"> </span>//WEP104 #define WPA_CIPHER_TKIP BIT(3)<span style="white-space:pre"> </span>//TKIP #define WPA_CIPHER_CCMP BIT(4)<span style="white-space:pre"> </span>//CCMP [cpp] view plain copy #define DEFAULT_PAIRWISE (WPA_CIPHER_CCMP | WPA_CIPHER_TKIP) #define DEFAULT_GROUP (WPA_CIPHER_CCMP | WPA_CIPHER_TKIP | \ WPA_CIPHER_WEP104 | WPA_CIPHER_WEP40) 3)key_mgmt:该成员和802.11中的AKM（Authentication and Key Managment，身份验证和密钥管理）suite相关。 [cpp] view plain copy #define WPA_KEY_MGMT_IEEE8021X BIT(0) #define WPA_KEY_MGMT_PSK BIT(1) #define WPA_KEY_MGMT_NONE BIT(2) #define WPA_KEY_MGMT_IEEE8021X_NO_WPA BIT(3) #define WPA_KEY_MGMT_WPA_NONE BIT(4) #define WPA_KEY_MGMT_FT_IEEE8021X BIT(5) #define WPA_KEY_MGMT_FT_PSK BIT(6) #define WPA_KEY_MGMT_IEEE8021X_SHA256 BIT(7) #define WPA_KEY_MGMT_PSK_SHA256 BIT(8) #define WPA_KEY_MGMT_WPS BIT(9) #define WPA_KEY_MGMT_SAE BIT(10) #define WPA_KEY_MGMT_FT_SAE BIT(11) #define WPA_KEY_MGMT_WAPI_PSK BIT(12) #define WPA_KEY_MGMT_WAPI_CERT BIT(13) #define WPA_KEY_MGMT_CCKM BIT(14) [cpp] view plain copy #define DEFAULT_KEY_MGMT (WPA_KEY_MGMT_PSK | WPA_KEY_MGMT_IEEE8021X) 4）proto：代表该无线网络支持的安全协议类型。 [cpp] view plain copy #define DEFAULT_PROTO (WPA_PROTO_WPA | WPA_PROTO_RSN) [cpp] view plain copy #define WPA_PROTO_WPA BIT(0) #define WPA_PROTO_RSN BIT(1) #define WPA_PROTO_WAPI BIT(2)5）auth_alg：表示该无线网络所支持的身份验证算法。其可取值如下：
[cpp] view plain copy #define WPA_AUTH_ALG_OPEN BIT(0)<span style="white-space:pre"> </span>//open system，如果要使用WPA或RSN，必须选择它 #define WPA_AUTH_ALG_SHARED BIT(1)<span style="white-space:pre"> </span>//Shard Key算法 #define WPA_AUTH_ALG_LEAP BIT(2)<span style="white-space:pre"> </span>//LEAP算法，LEAP是思科公司提出的身份验证算法 #define WPA_AUTH_ALG_FT BIT(3)<span style="white-space:pre"> </span>//和FT有关 #define WPA_AUTH_ALG_SAE BIT(4) 6）eapol_flags:和动态WEP Key有关 [cpp] view plain copy #define EAPOL_FLAG_REQUIRE_KEY_UNICAST BIT(0) #define EAPOL_FLAG_REQUIRE_KEY_BROADCAST BIT(1) （2）其他成员变量1）proactive_key_caching:该变量和OPC（Opportunistic PMK Caching)技术相关。
2）disable：该变量取值为0（代表该无线网络可用）、1（代表该无线网络被禁止使用，但可通过命令来启用它）、2（表示该无线网络和P2P有关）
3）mode：wpa_ssid结构体内部还定义了一个枚举型变量 2、wpa_supplicant结构体
wpa_supplicant结构体定义的成员变量非常多。详细请参考wpa_supplicant_i.h文件。
wpa_supplicant_init_iface函数分析
[cpp] view plain copy static int wpa_supplicant_init_iface(struct wpa_supplicant *wpa_s, struct wpa_interface *iface) { const char *ifname, *driver; struct wpa_driver_capa capa; wpa_printf(MSG_DEBUG, "Initializing interface '%s' conf '%s' driver " "'%s' ctrl_interface '%s' bridge '%s'", iface->ifname, iface->confname ? iface->confname : "N/A", iface->driver ? iface->driver : "default", iface->ctrl_interface ? iface->ctrl_interface : "N/A", iface->bridge_ifname ? iface->bridge_ifname : "N/A"); if (iface->confname) { #ifdef CONFIG_BACKEND_FILE wpa_s->confname = os_rel2abs_path(iface->confname); if (wpa_s->confname == NULL) { wpa_printf(MSG_ERROR, "Failed to get absolute path " "for configuration file '%s'.", iface->confname); return -1; } wpa_printf(MSG_DEBUG, "Configuration file '%s' -> '%s'", iface->confname, wpa_s->confname); #else /* CONFIG_BACKEND_FILE */ wpa_s->confname = os_strdup(iface->confname); #endif /* CONFIG_BACKEND_FILE */ wpa_s->conf = wpa_config_read(wpa_s->confname, NULL); if (wpa_s->conf == NULL) { wpa_printf(MSG_ERROR, "Failed to read or parse " "configuration '%s'.", wpa_s->confname); return -1; } wpa_s->confanother = os_rel2abs_path(iface->confanother); wpa_config_read(wpa_s->confanother, wpa_s->conf); /* * Override ctrl_interface and driver_param if set on command * line. */ if (iface->ctrl_interface) { os_free(wpa_s->conf->ctrl_interface); wpa_s->conf->ctrl_interface = os_strdup(iface->ctrl_interface); } if (iface->driver_param) { os_free(wpa_s->conf->driver_param); wpa_s->conf->driver_param = os_strdup(iface->driver_param); } if (iface->p2p_mgmt && !iface->ctrl_interface) { os_free(wpa_s->conf->ctrl_interface); wpa_s->conf->ctrl_interface = NULL; } } else wpa_s->conf = wpa_config_alloc_empty(iface->ctrl_interface, iface->driver_param); if (wpa_s->conf == NULL) { wpa_printf(MSG_ERROR, "\nNo configuration found."); return -1; } if (iface->ifname == NULL) { wpa_printf(MSG_ERROR, "\nInterface name is required."); return -1; } if (os_strlen(iface->ifname) >= sizeof(wpa_s->ifname)) { wpa_printf(MSG_ERROR, "\nToo long interface name '%s'.", iface->ifname); return -1; } os_strlcpy(wpa_s->ifname, iface->ifname, sizeof(wpa_s->ifname)); if (iface->bridge_ifname) { if (os_strlen(iface->bridge_ifname) >= sizeof(wpa_s->bridge_ifname)) { wpa_printf(MSG_ERROR, "\nToo long bridge interface " "name '%s'.", iface->bridge_ifname); return -1; } os_strlcpy(wpa_s->bridge_ifname, iface->bridge_ifname, sizeof(wpa_s->bridge_ifname)); } /* RSNA Supplicant Key Management - INITIALIZE */ eapol_sm_notify_portEnabled(wpa_s->eapol, FALSE); eapol_sm_notify_portValid(wpa_s->eapol, FALSE); /* Initialize driver interface and register driver event handler before * L2 receive handler so that association events are processed before * EAPOL-Key packets if both become available for the same select() * call. */ driver = iface->driver; next_driver: if (wpa_supplicant_set_driver(wpa_s, driver) < 0) return -1; wpa_s->drv_priv = wpa_drv_init(wpa_s, wpa_s->ifname); if (wpa_s->drv_priv == NULL) { const char *pos; pos = driver ? os_strchr(driver, ',') : NULL; if (pos) { wpa_dbg(wpa_s, MSG_DEBUG, "Failed to initialize " "driver interface - try next driver wrapper"); driver = pos + 1; goto next_driver; } wpa_msg(wpa_s, MSG_ERROR, "Failed to initialize driver " "interface"); return -1; } if (wpa_drv_set_param(wpa_s, wpa_s->conf->driver_param) < 0) { wpa_msg(wpa_s, MSG_ERROR, "Driver interface rejected " "driver_param '%s'", wpa_s->conf->driver_param); return -1; } ifname = wpa_drv_get_ifname(wpa_s); if (ifname && os_strcmp(ifname, wpa_s->ifname) != 0) { wpa_dbg(wpa_s, MSG_DEBUG, "Driver interface replaced " "interface name with '%s'", ifname); os_strlcpy(wpa_s->ifname, ifname, sizeof(wpa_s->ifname)); } if (wpa_supplicant_init_wpa(wpa_s) < 0) return -1; wpa_sm_set_ifname(wpa_s->wpa, wpa_s->ifname, wpa_s->bridge_ifname[0] ? wpa_s->bridge_ifname : NULL); wpa_sm_set_fast_reauth(wpa_s->wpa, wpa_s->conf->fast_reauth); if (wpa_s->conf->dot11RSNAConfigPMKLifetime && wpa_sm_set_param(wpa_s->wpa, RSNA_PMK_LIFETIME, wpa_s->conf->dot11RSNAConfigPMKLifetime)) { wpa_msg(wpa_s, MSG_ERROR, "Invalid WPA parameter value for " "dot11RSNAConfigPMKLifetime"); return -1; } if (wpa_s->conf->dot11RSNAConfigPMKReauthThreshold && wpa_sm_set_param(wpa_s->wpa, RSNA_PMK_REAUTH_THRESHOLD, wpa_s->conf->dot11RSNAConfigPMKReauthThreshold)) { wpa_msg(wpa_s, MSG_ERROR, "Invalid WPA parameter value for " "dot11RSNAConfigPMKReauthThreshold"); return -1; } if (wpa_s->conf->dot11RSNAConfigSATimeout && wpa_sm_set_param(wpa_s->wpa, RSNA_SA_TIMEOUT, wpa_s->conf->dot11RSNAConfigSATimeout)) { wpa_msg(wpa_s, MSG_ERROR, "Invalid WPA parameter value for " "dot11RSNAConfigSATimeout"); return -1; } wpa_s->hw.modes = wpa_drv_get_hw_feature_data(wpa_s, &wpa_s->hw.num_modes, &wpa_s->hw.flags); if (wpa_drv_get_capa(wpa_s, &capa) == 0) { wpa_s->drv_capa_known = 1; wpa_s->drv_flags = capa.flags; wpa_s->drv_enc = capa.enc; wpa_s->probe_resp_offloads = capa.probe_resp_offloads; wpa_s->max_scan_ssids = capa.max_scan_ssids; wpa_s->max_sched_scan_ssids = capa.max_sched_scan_ssids; wpa_s->sched_scan_supported = capa.sched_scan_supported; wpa_s->max_match_sets = capa.max_match_sets; wpa_s->max_remain_on_chan = capa.max_remain_on_chan; wpa_s->max_stations = capa.max_stations; wpa_s->extended_capa = capa.extended_capa; wpa_s->extended_capa_mask = capa.extended_capa_mask; wpa_s->extended_capa_len = capa.extended_capa_len; wpa_s->num_multichan_concurrent = capa.num_multichan_concurrent; } if (wpa_s->max_remain_on_chan == 0) wpa_s->max_remain_on_chan = 1000; /* * Only take p2p_mgmt parameters when P2P Device is supported. * Doing it here as it determines whether l2_packet_init() will be done * during wpa_supplicant_driver_init(). */ if (wpa_s->drv_flags & WPA_DRIVER_FLAGS_DEDICATED_P2P_DEVICE) wpa_s->p2p_mgmt = iface->p2p_mgmt; else iface->p2p_mgmt = 1; if (wpa_s->num_multichan_concurrent == 0) wpa_s->num_multichan_concurrent = 1; if (wpa_supplicant_driver_init(wpa_s) < 0) return -1; #ifdef CONFIG_TDLS if ((!iface->p2p_mgmt || !(wpa_s->drv_flags & WPA_DRIVER_FLAGS_DEDICATED_P2P_DEVICE)) && wpa_tdls_init(wpa_s->wpa)) return -1; #endif /* CONFIG_TDLS */ if (wpa_s->conf->country[0] && wpa_s->conf->country[1] && wpa_drv_set_country(wpa_s, wpa_s->conf->country)) { wpa_dbg(wpa_s, MSG_DEBUG, "Failed to set country"); return -1; } if (wpas_wps_init(wpa_s)) return -1; if (wpa_supplicant_init_eapol(wpa_s) < 0) return -1; wpa_sm_set_eapol(wpa_s->wpa, wpa_s->eapol); wpa_s->ctrl_iface = wpa_supplicant_ctrl_iface_init(wpa_s); if (wpa_s->ctrl_iface == NULL) { wpa_printf(MSG_ERROR, "Failed to initialize control interface '%s'.\n" "You may have another wpa_supplicant process " "already running or the file was\n" "left by an unclean termination of wpa_supplicant " "in which case you will need\n" "to manually remove this file before starting " "wpa_supplicant again.\n", wpa_s->conf->ctrl_interface); return -1; } wpa_s->gas = gas_query_init(wpa_s); if (wpa_s->gas == NULL) { wpa_printf(MSG_ERROR, "Failed to initialize GAS query"); return -1; } #ifdef CONFIG_P2P if (iface->p2p_mgmt && wpas_p2p_init(wpa_s->global, wpa_s) < 0) { wpa_msg(wpa_s, MSG_ERROR, "Failed to init P2P"); return -1; } #endif /* CONFIG_P2P */ if (wpa_bss_init(wpa_s) < 0) return -1; #ifdef CONFIG_EAP_PROXY { size_t len; wpa_s->mnc_len = eap_proxy_get_imsi(wpa_s->imsi, &len); if (wpa_s->mnc_len > 0) { wpa_s->imsi[len] = '\0'; wpa_printf(MSG_DEBUG, "eap_proxy: IMSI %s (MNC length %d)", wpa_s->imsi, wpa_s->mnc_len); } else { wpa_printf(MSG_DEBUG, "eap_proxy: IMSI not available"); } } #endif /* CONFIG_EAP_PROXY */ if (pcsc_reader_init(wpa_s) < 0) return -1; if (wpas_init_ext_pw(wpa_s) < 0) return -1; return 0; } 1、init_iface初始化的第一个工作是解析运行时配置文件。其中，wpa_s->confname的值为“/data/misc/wifi/wpa_supplicant.conf”,解析函数是wpa_config_read。 [cpp] view plain copy struct wpa_config * wpa_config_read(const char *name, struct wpa_config *cfgp) { FILE *f; char buf[512], *pos; int errors = 0, line = 0; struct wpa_ssid *ssid, *tail = NULL, *head = NULL; struct wpa_cred *cred, *cred_tail = NULL, *cred_head = NULL; struct wpa_config *config; int id = 0; int cred_id = 0; if (name == NULL) return NULL; if (cfgp) config = cfgp; else config = wpa_config_alloc_empty(NULL, NULL); if (config == NULL) { wpa_printf(MSG_ERROR, "Failed to allocate config file " "structure"); return NULL; } head = config->ssid; cred_head = config->cred; wpa_printf(MSG_DEBUG, "Reading configuration file '%s'", name); f = fopen(name, "r"); if (f == NULL) { wpa_printf(MSG_ERROR, "Failed to open config file '%s', " "error: %s", name, strerror(errno)); os_free(config); return NULL; } while (wpa_config_get_line(buf, sizeof(buf), f, &line, &pos)) { if (os_strcmp(pos, "network={") == 0) { ssid = wpa_config_read_network(f, &line, id++); if (ssid == NULL) { wpa_printf(MSG_ERROR, "Line %d: failed to " "parse network block.", line); errors++; continue; } if (head == NULL) { head = tail = ssid; } else { tail->next = ssid; tail = ssid; } if (wpa_config_add_prio_network(config, ssid)) { wpa_printf(MSG_ERROR, "Line %d: failed to add " "network block to priority list.", line); errors++; continue; } } else if (os_strcmp(pos, "cred={") == 0) { cred = wpa_config_read_cred(f, &line, cred_id++); if (cred == NULL) { wpa_printf(MSG_ERROR, "Line %d: failed to " "parse cred block.", line); errors++; continue; } if (cred_head == NULL) { cred_head = cred_tail = cred; } else { cred_tail->next = cred; cred_tail = cred; } #ifndef CONFIG_NO_CONFIG_BLOBS } else if (os_strncmp(pos, "blob-base64-", 12) == 0) { if (wpa_config_process_blob(config, f, &line, pos + 12) < 0) { wpa_printf(MSG_ERROR, "Line %d: failed to " "process blob.", line); errors++; continue; } #endif /* CONFIG_NO_CONFIG_BLOBS */ } else if (wpa_config_process_global(config, pos, line) < 0) { wpa_printf(MSG_ERROR, "Line %d: Invalid configuration " "line '%s'.", line, pos); errors++; continue; } } fclose(f); config->ssid = head; wpa_config_debug_dump_networks(config); config->cred = cred_head; #ifndef WPA_IGNORE_CONFIG_ERRORS if (errors) { wpa_config_free(config); config = NULL; head = NULL; } #endif /* WPA_IGNORE_CONFIG_ERRORS */ return config; } wpa_config和wpa_ssid这两个数据结构都是配置文件中的信息在代码中的实现。 2、wpa_supplicant_set_driver将根据nl80211找到wpa_driver数组中nl80211指定的driver对象wpa_driver_nl80211_ops，然后调用其global_init函数。global_init是wpa_driver_ops结构体重的一个类型为函数指针的成员变量。
[cpp] view plain copy static void * nl80211_global_init(void) { struct nl80211_global *global; struct netlink_config *cfg; global = os_zalloc(sizeof(*global)); if (global == NULL) return NULL; global->ioctl_sock = -1; dl_list_init(&global->interfaces); global->if_add_ifindex = -1; cfg = os_zalloc(sizeof(*cfg)); if (cfg == NULL) goto err; cfg->ctx = global; cfg->newlink_cb = wpa_driver_nl80211_event_rtm_newlink; cfg->dellink_cb = wpa_driver_nl80211_event_rtm_dellink; global->netlink = netlink_init(cfg); if (global->netlink == NULL) { os_free(cfg); goto err; } if (wpa_driver_nl80211_init_nl_global(global) < 0) goto err; global->ioctl_sock = socket(PF_INET, SOCK_DGRAM, 0); if (global->ioctl_sock < 0) { perror("socket(PF_INET,SOCK_DGRAM)"); goto err; } return global; err: nl80211_global_deinit(global); return NULL; } [cpp] view plain copy static int wpa_driver_nl80211_init_nl_global(struct nl80211_global *global) { int ret; global->nl_cb = nl_cb_alloc(NL_CB_DEFAULT); if (global->nl_cb == NULL) { wpa_printf(MSG_ERROR, "nl80211: Failed to allocate netlink " "callbacks"); return -1; } global->nl = nl_create_handle(global->nl_cb, "nl"); if (global->nl == NULL) goto err; global->nl80211_id = genl_ctrl_resolve(global->nl, "nl80211"); if (global->nl80211_id < 0) { wpa_printf(MSG_ERROR, "nl80211: 'nl80211' generic netlink not " "found"); goto err; } global->nl_event = nl_create_handle(global->nl_cb, "event"); if (global->nl_event == NULL) goto err; ret = nl_get_multicast_id(global, "nl80211", "scan"); if (ret >= 0) ret = nl_socket_add_membership(global->nl_event, ret); if (ret < 0) { wpa_printf(MSG_ERROR, "nl80211: Could not add multicast " "membership for scan events: %d (%s)", ret, strerror(-ret)); goto err; } ret = nl_get_multicast_id(global, "nl80211", "mlme"); if (ret >= 0) ret = nl_socket_add_membership(global->nl_event, ret); if (ret < 0) { wpa_printf(MSG_ERROR, "nl80211: Could not add multicast " "membership for mlme events: %d (%s)", ret, strerror(-ret)); goto err; } ret = nl_get_multicast_id(global, "nl80211", "regulatory"); if (ret >= 0) ret = nl_socket_add_membership(global->nl_event, ret); if (ret < 0) { wpa_printf(MSG_DEBUG, "nl80211: Could not add multicast " "membership for regulatory events: %d (%s)", ret, strerror(-ret)); /* Continue without regulatory events */ } nl_cb_set(global->nl_cb, NL_CB_SEQ_CHECK, NL_CB_CUSTOM, no_seq_check, NULL); nl_cb_set(global->nl_cb, NL_CB_VALID, NL_CB_CUSTOM, process_global_event, global); eloop_register_read_sock(nl_socket_get_fd(global->nl_event), wpa_driver_nl80211_event_receive, global->nl_cb, global->nl_event); return 0; err: nl_destroy_handles(&global->nl_event); nl_destroy_handles(&global->nl); nl_cb_put(global->nl_cb); global->nl_cb = NULL; return -1; } 3、wpa_drv_init函数处理单个driver。内部调用init2函数。 [cpp] view plain copy static void * wpa_driver_nl80211_init(void *ctx, const char *ifname, void *global_priv) { struct wpa_driver_nl80211_data *drv; struct rfkill_config *rcfg; struct i802_bss *bss; if (global_priv == NULL) return NULL; drv = os_zalloc(sizeof(*drv)); if (drv == NULL) return NULL; drv->global = global_priv; drv->ctx = ctx; bss = &drv->first_bss; bss->drv = drv; bss->ctx = ctx; os_strlcpy(bss->ifname, ifname, sizeof(bss->ifname)); drv->monitor_ifidx = -1; drv->monitor_sock = -1; drv->eapol_tx_sock = -1; drv->ap_scan_as_station = NL80211_IFTYPE_UNSPECIFIED; if (wpa_driver_nl80211_init_nl(drv)) { os_free(drv); return NULL; } if (nl80211_init_bss(bss)) goto failed; rcfg = os_zalloc(sizeof(*rcfg)); if (rcfg == NULL) goto failed; rcfg->ctx = drv; os_strlcpy(rcfg->ifname, ifname, sizeof(rcfg->ifname)); rcfg->blocked_cb = wpa_driver_nl80211_rfkill_blocked; rcfg->unblocked_cb = wpa_driver_nl80211_rfkill_unblocked; drv->rfkill = rfkill_init(rcfg); if (drv->rfkill == NULL) { wpa_printf(MSG_DEBUG, "nl80211: RFKILL status not available"); os_free(rcfg); } if (wpa_driver_nl80211_finish_drv_init(drv)) goto failed; drv->eapol_tx_sock = socket(PF_PACKET, SOCK_DGRAM, 0); if (drv->eapol_tx_sock < 0) goto failed; if (drv->data_tx_status) { int enabled = 1; if (setsockopt(drv->eapol_tx_sock, SOL_SOCKET, SO_WIFI_STATUS, &enabled, sizeof(enabled)) < 0) { wpa_printf(MSG_DEBUG, "nl80211: wifi status sockopt failed\n"); drv->data_tx_status = 0; if (!drv->use_monitor) drv->capa.flags &= ~WPA_DRIVER_FLAGS_EAPOL_TX_STATUS; } else { eloop_register_read_sock(drv->eapol_tx_sock, wpa_driver_nl80211_handle_eapol_tx_status, drv, NULL); } } if (drv->global) { dl_list_add(&drv->global->interfaces, &drv->list); drv->in_interface_list = 1; } return bss; failed: wpa_driver_nl80211_deinit(bss); return NULL; }