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小弟用的是ath9k的源码,经过分析我大概可以分析出来应该是通过beacon帧的携带的信息获取的。流程大概如下所示
ieee80211_rx_h_mgmt调用ieee80211_queue_work(&rx->local->hw, &sdata->work);也就是进入了iface.c中的ieee80211_iface_work函数;这在个函数中接着调用
ieee80211_sta_rx_queued_mgmt(这里考虑AP模式下的情况);进而调用ieee80211_rx_mgmt_beacon这个函数,这个函数通过依次调用ieee80211_bss_info_update, cfg80211_inform_bss_width_frame 和cfg80211_bss_update函数将接收到的BSS信息保存在rdev中;最后一个函数cfg中可以看到是一个红黑树的基本操作,如果之前的BSS存在则更新,不存在则创建一个新的插入进去,代码非常值得一看。
这里我遇到的问题是rdev中的数据是如何被上层获取的,一般来说都是通过cfg.c中定义的函数获取并返回用户态。下面是cfg.c中定义的全部ops但是我并没有找到是获取BSS信息的。请各位大神多多指点,不甚感激。- const struct cfg80211_ops mac80211_config_ops = {
- .add_virtual_intf = ieee80211_add_iface,
- .del_virtual_intf = ieee80211_del_iface,
- .change_virtual_intf = ieee80211_change_iface,
- .start_p2p_device = ieee80211_start_p2p_device,
- .stop_p2p_device = ieee80211_stop_p2p_device,
- .add_key = ieee80211_add_key,
- .del_key = ieee80211_del_key,
- .get_key = ieee80211_get_key,
- .set_default_key = ieee80211_config_default_key,
- .set_default_mgmt_key = ieee80211_config_default_mgmt_key,
- .start_ap = ieee80211_start_ap,
- .change_beacon = ieee80211_change_beacon,
- .stop_ap = ieee80211_stop_ap,
- .add_station = ieee80211_add_station,
- .del_station = ieee80211_del_station,
- .change_station = ieee80211_change_station,
- .get_station = ieee80211_get_station,
- .dump_station = ieee80211_dump_station,
- .dump_survey = ieee80211_dump_survey,
- #ifdef CPTCFG_MAC80211_MESH
- .add_mpath = ieee80211_add_mpath,
- .del_mpath = ieee80211_del_mpath,
- .change_mpath = ieee80211_change_mpath,
- .get_mpath = ieee80211_get_mpath,
- .dump_mpath = ieee80211_dump_mpath,
- .update_mesh_config = ieee80211_update_mesh_config,
- .get_mesh_config = ieee80211_get_mesh_config,
- .join_mesh = ieee80211_join_mesh,
- .leave_mesh = ieee80211_leave_mesh,
- #endif
- .change_bss = ieee80211_change_bss,
- .set_txq_params = ieee80211_set_txq_params,
- .set_monitor_channel = ieee80211_set_monitor_channel,
- .suspend = ieee80211_suspend,
- .resume = ieee80211_resume,
- .scan = ieee80211_scan,
- .sched_scan_start = ieee80211_sched_scan_start,
- .sched_scan_stop = ieee80211_sched_scan_stop,
- .auth = ieee80211_auth,
- .assoc = ieee80211_assoc,
- .deauth = ieee80211_deauth,
- .disassoc = ieee80211_disassoc,
- .join_ibss = ieee80211_join_ibss,
- .leave_ibss = ieee80211_leave_ibss,
- .set_mcast_rate = ieee80211_set_mcast_rate,
- .set_wiphy_params = ieee80211_set_wiphy_params,
- .set_tx_power = ieee80211_set_tx_power,
- .get_tx_power = ieee80211_get_tx_power,
- .set_antenna_gain = ieee80211_set_antenna_gain,
- .set_wds_peer = ieee80211_set_wds_peer,
- .rfkill_poll = ieee80211_rfkill_poll,
- CFG80211_TESTMODE_CMD(ieee80211_testmode_cmd)
- CFG80211_TESTMODE_DUMP(ieee80211_testmode_dump)
- .set_power_mgmt = ieee80211_set_power_mgmt,
- .set_bitrate_mask = ieee80211_set_bitrate_mask,
- .remain_on_channel = ieee80211_remain_on_channel,
- .cancel_remain_on_channel = ieee80211_cancel_remain_on_channel,
- .mgmt_tx = ieee80211_mgmt_tx,
- .mgmt_tx_cancel_wait = ieee80211_mgmt_tx_cancel_wait,
- .set_cqm_rssi_config = ieee80211_set_cqm_rssi_config,
- .mgmt_frame_register = ieee80211_mgmt_frame_register,
- .set_antenna = ieee80211_set_antenna,
- .get_antenna = ieee80211_get_antenna,
- .set_rekey_data = ieee80211_set_rekey_data,
- .tdls_oper = ieee80211_tdls_oper,
- .tdls_mgmt = ieee80211_tdls_mgmt,
- .probe_client = ieee80211_probe_client,
- .set_noack_map = ieee80211_set_noack_map,
- #ifdef CONFIG_PM
- .set_wakeup = ieee80211_set_wakeup,
- #endif
- .get_channel = ieee80211_cfg_get_channel,
- .start_radar_detection = ieee80211_start_radar_detection,
- .channel_switch = ieee80211_channel_switch,
- .set_qos_map = ieee80211_set_qos_map,
- .set_ap_chanwidth = ieee80211_set_ap_chanwidth,
- };
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