【ioctl二】无线扩展ioctl

简介：本文是在上文的基础上，介绍下无线扩展socekt控制ioctl的实例。
文章基础：WIFI设备管理工具iwconfig/iwpriv及对应内核态的实现机制
一、ioctl的cmd（注意理解其中的地址大小包含关系）

#define SIOCDEVPRIVATE 0x89F0//①老的无线私有ioctl：最初的iwpriv实现使用的ioctl号范围由SIOCDEVPRIVATE确定[#define SIOCDEVPRIVATE 0x89F0 /* to 89FF */]；但这些ioctl被其它功能占用，支持功能有限。

#define SIOCIWFIRST 0x8B00//④新的无线标准ioctl。

#define SIOCGIWPRIV 0x8B0D//③用户可以使用SIOCGIWPRIV(#define SIOCGIWPRIV 0x8B0D)来获取私有ioctl的描述信息。


#define SIOCIWFIRSTPRIV   0x8BE0//②新的无线私有ioctl：新ioctl范围由SIOCIWFIRSTPRIV确定；这些ioctl是特定为无线扩展使用，不用担心与其它功能冲突；SIOCIWFIRSTPRIV支持私有ioctl号为32个。

#define SIOCIWLASTPRIV 0x8BFF


#define SIOCIWLAST SIOCIWLASTPRIV 0x8BFF

注释：无线扩展（Wireless Extensions）就是新的无线标准ioctl+新的无线私有ioctl。
二、ioctl的cmd调用实例（有空在排版，我直接上传我排版好的txt）

//Old driver API
wlanconfig ath4 list sta    IEEE80211_IOCTL_STA_INFO                                            ->    case IEEE80211_IOCTL_STA_INFO    ->    ieee80211_ioctl()                                                                    ->    ndo_do_ioctl = ieee80211_ioctl()            ->    dev->netdev_ops->ndo_do_ioctl
//无线标准ioctl用户态工具对应iwconfig
iwconfig ath16 txpower 15    SIOCSIWTXPOW(注意区别于SIOCSIWPOWER)(无)                                    ->    无                ->    static const iw_handler ieee80211_handlers[] = {...(iw_handler) ieee80211_ioctl_siwtxpow, /* SIOCSIWTXPOW */...}                    ->    dev->wireless_handlers = &ieee80211_iw_handler_def    ->    dev->wireless_handlers
//无线私有ioctl用户态工具对应iwpriv
iwpriv wifi0 get_country    ATH_IOCTL_GETCOUNTRY(static const struct iw_priv_args ol_ath_iw_priv_args[] = {...ATH_IOCTL_GETCOUNTRY...})    ->    case ATH_IOCTL_GETCOUNTRY    ->    static const iw_handler ol_ath_iw_priv_handlers[] = {...(iw_handler) ol_ath_iw_setcountry, /* SIOCWFIRSTPRIV+2 */...}                ->    dev->wireless_handlers = &ol_ath_iw_handler_def        ->    dev->wireless_handlers
iwpriv wifi0 sync_sta        OL_ATH_PARAM_SYNC_STA(static const struct iw_priv_args ol_ath_iw_priv_args[] = {...OL_ATH_PARAM_SYNC_STA...})    ->    case OL_ATH_PARAM_SYNC_STA    ->    static const iw_handler ol_ath_iw_priv_handlers[] = {...(iw_handler) ol_ath_iw_getparam, /* SIOCWFIRSTPRIV+1 */...}    ->在其case中处理    ->    dev->wireless_handlers = &ol_ath_iw_handler_def        ->    dev->wireless_handlers
iwpriv ath0 get_mode        IEEE80211_IOCTL_GETMODE(static const struct ieee80211_priv_args[] = {...IEEE80211_IOCTL_GETMODE...})        ->    case IEEE80211_IOCTL_GETMODE    ->    static const iw_handler ieee80211_priv_handlers[] = {...(iw_handler) ieee80211_ioctl_getmode, /* SIOCWFIRSTPRIV+17 */...}                ->    dev->wireless_handlers = &ieee80211_iw_handler_def    ->    dev->wireless_handlers
iwpriv ath0 get_sta_count    IEEE80211_PARAM_STA_COUNT(static const struct ieee80211_priv_args[] = {...IEEE80211_PARAM_STA_COUNT...})    ->    case IEEE80211_PARAM_STA_COUNT    ->    static const iw_handler ieee80211_priv_handlers[] = {...(iw_handler) ieee80211_ioctl_getparam, /* SIOCWFIRSTPRIV+1 */...}    ->在其case中处理    ->    dev->wireless_handlers = &ieee80211_iw_handler_def    ->    dev->wireless_handlers

另外，我们研究下iwpriv工具。在iwpriv中，就巧妙利用了SIOCGIWPRIV来玩转所有私有cmd：
iwpriv/iwpriv ath0        ->    print_priv_info ->    iw_get_priv_info
iwpriv -a/iwpriv ath0 -a    ->    print_priv_all    ->    iw_get_priv_info
iwpriv ath0 getmode        ->    set_private    ->    iw_get_priv_info//即调用iwlib.c中的iw_get_priv_info中通过ioctl(SIOCGIWPRIV)获取到私有信息，其次调用set_private_cmd中匹配到私有cmd并ioctl(私有cmd)。    ->    if (cmd == SIOCGIWPRIV && dev->wireless_handlers)//获取私有ioctl的描述信息

example.txt