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iwpriv工具通过ioctl动态获取相应无线网卡驱动的private_args所有扩展参数
iwpriv是处理下面的wlan_private_args的所有扩展命令,iwpriv的实现上,是这样的,=&main=&set_private=&iw_get_priv_info获取wireless网卡所能处理的所有wlan_private_args类型.
dev_ioctl=&wext_handle_ioctl=&wireless_process_ioctl&&& if (cmd == SIOCGIWPRIV && dev-&wireless_handlers)&&&&&&& return ioctl_standard_call(dev, ifr, cmd,&&&&&&&&&&&&&&&&&&&& &iw_handler_get_private);static int ioctl_standard_call(struct net_device *&&& dev,&&&&&&&&&&&& struct ifreq *&&&&&&& ifr,&&&&&&&&&&&& unsigned int&&&&&&& cmd,&&&&&&&&&&&& iw_handler&&&&&&& handler){&&& ...&&&&&&& /* Call the handler */&&&&&&& ret = handler(dev, &info, &(iwr-&u), extra);&&&&&&&&&&& if (user_length & iwr-&u.data.length) {&&&&&&&&&&&&&&& kfree(extra);&&&&&&&&&&&&&&& return -E2BIG;//通知iwpriv,本wifi网卡对应的private命令还没有完,还有,这样iwpriv将会继续//maxpriv默认为16,即将以16个为一组,一组一组的从wifi网卡驱动读取该网卡所能支持的所有private_args参数//newpriv = realloc(priv, maxpriv * sizeof(priv[0]));继续申请,继续拷贝,知道将wifi网卡自定义的wlan_private_args参数全部//传出到iwpriv为止.&&&&&&&&&&& }&&& ...}&&& /* New driver API : try to find the handler */&&& handler = get_handler(dev, cmd);//获取
&&& if (handler) {&&&&&&& /* Standard and private are not the same */&&&&&&& if (cmd & SIOCIWFIRSTPRIV)&&&&&&&&&&& return ioctl_standard_call(dev, ifr, cmd, handler);&&&&&&& else
//如果有对应的handler,那么处理iwpriv的命令,可以我们的iwpriv都是由dev-&do_ioctl完成的.&&&&&&&&&&& return ioctl_private_call(dev, ifr, cmd, handler);&&& }&&& /* Old driver API : call driver ioctl handler */&&& if (dev-&do_ioctl)//如果dev-&wireless_handlers-&standard和dev-&wireless_handlers-&private[index都不对该cmd作处理,那么由//dev-&do_ioctl = wlan_do_我们驱动的最后处理函数wlan_do_ioctl处理.&&&&&&& return dev-&do_ioctl(dev, ifr, cmd);
static iw_handler get_handler(struct net_device *dev, unsigned int cmd){&&& /* Don't "optimise" the following variable, it will crash */&&& unsigned int&&&&&&&&&& /* *MUST* be unsigned */
&&& /* Check if we have some wireless handlers defined */&&& if (dev-&wireless_handlers == NULL)&&&&&&& return NULL;
&&& /* Try as a standard command */&&& index = cmd - SIOCIWFIRST;&&& if (index & dev-&wireless_handlers-&num_standard)&&&&&&& return dev-&wireless_handlers-&standard[index];
&&& /* Try as a private command */&&& index = cmd - SIOCIWFIRSTPRIV;//
&&& if (index & dev-&wireless_handlers-&num_private)&&&&&&& return dev-&wireless_handlers-&private[index];//该private命令的handler.&&& /* Not found */&&& return NULL;}
下面wlan_private_args为本wifi网卡驱动的所能支持的所有命令,也就是iwpriv命令所能支持的所有命令
struct iw_handler_def wlan_handler_def = {& num_standard:sizeof(wlan_handler) / sizeof(iw_handler),& num_private:sizeof(wlan_private_handler) / sizeof(iw_handler),& num_private_args:sizeof(wlan_private_args) / sizeof(struct iw_priv_args),& standard:(iw_handler *) wlan_handler,& private:(iw_handler *) wlan_private_handler,& private_args:(struct iw_priv_args *) wlan_private_args,#if WIRELESS_EXT & 20& get_wireless_stats:wlan_get_wireless_stats,#endif};
以下为示意代码,我们的wifi网卡驱动支持如下iwpriv命令.
static const struct iw_priv_args wlan_private_args[] = {&&&& "extscan"/&&&& "hostcmd"/&&&& "arpfilter"/&&&& "regrdwr"/&&&& "sdcmd52rw"/&&&& "sdcmd53rw"/&&&& "setgetconf"/&&&& "getcis"/&&&& "scantype"/&&&& "deauth"&&&& "getNF"/&&&& "getRSSI"/&&&& "bgscan"/&&&& "enable11d"/&&&& "adhocgrate"&&&& "sdioclock"/&&&& "wmm"/&&&& "uapsdnullgen"/&&&& "setcoalescing"/&&&& "adhocgprot"&&&& "setpowercons"/&&&& "wmm_qosinfo"/&&&& "lolisteninter"/&&&& "fwwakeupmethod"&&&& "psnullinterval"/&&&& "bcnmisto"/&&&& "adhocawakepd"/&&&& "moduletype"&&&& "autodeepsleep"/&&&& "enhanceps"/&&&& "wakeupmt"/&&&& "setrxant"/&&&& "settxant"&&&& "authalgs"/&&&& "encryptionmode"/&&&& "setregioncode"/&&&& "setlisteninter"&&&& "setmultipledtim"/&&&& "setbcnavg"/&&&& "setdataavg"/&&&& "associate"/&&&& "getregioncode"&&&& "getlisteninter"/&&&& "getmultipledtim"/&&&& "gettxrate"/&&&& "getbcnavg"&&&& "getdataavg"/&&&& "getrxant"/&&&& "gettxant"/&&&& "gettsf"/&&&& "wpssession"&&&& "deepsleep"/&&&& "adhocstop"/&&&& "radioon"/&&&& "radiooff"/&&&& "rmaeskey"&&&& "crypto_test"/&&&& "reasso-on"/&&&& "reasso-off"/&&&& "wlanidle-on"/&&&& "wlanidle-off"&&&& "sleepparams"/&&&& "requesttpc"/&&&& "powercap"/&&&& "measreq"/&&&& "bca-ts"&&&& "scanmode"/&&&& "getadhocstatus"/&&&& "setgenie"/&&&& "getgenie"/&&&& "qstatus"&&&& "ts_status"/&&&& "setaeskey"/&&&& "getaeskey"/&&&& "version"/&&&& "verext"/&&&& "setwpaie"&&&& "setband"/&&&& "setadhocch"/&&&& "chanswann"/&&&& "getband"/&&&& "getadhocch"&&&& "getlog"/&&&& "tpccfg"/&&&& "scanprobes"/&&&& "ledgpio"/&&&& "sleeppd"/&&&& "rateadapt"&&&& "getSNR"/&&&& "getrate"/&&&& "getrxinfo"/&&&& "atimwindow"/&&&& "bcninterval"/&&&& "sdiopullctrl"&&&& "scantime"/&&&& "sysclock"/&&&& "txcontrol"/&&&& "hscfg"/&&&& "hssetpara"/&&&& "inactoext"&&&& "dbgscfg"/&&&& "drvdbg"/&&&& "drvdelaymax"/&&&& "intfctrl"/&&&& "setquietie"/&&&& ""&&&& "setuserscan"/&&&& "getscantable"/&&&& "setmrvltlv"/&&&& "getassocrsp"/&&&& "addts"&&&& "delts"/&&& "qconfig"/&&&& "qstats"/&&&& "txpktstats"/&&&& "getcfptable"/&&&& "mefcfg"&&&& "getmem"
浅析ethx网卡控制函数ioctl实现具体流程
====================1.应用层程序iwprivwireless tools网络配置应用程序iwpriv命令格式:iwpriv ethX private-command [parameters]
iwpriv部分实现源码如下:int main(int argc, char *argv[]){&&& ...&&& sockfd = socket(AF_INET, SOCK_STREAM, 0);&&& ...&&& ioctl(sockfd, ioctl_val, &iwr);//将控制命令通过ioctl发送到无线网卡&&& ...}====================2.系统调用sys_ioctl应用层通过ioctl(sockfd, ioctl_val, &iwr);触发sys_ioctl系统调用,实际流程:sys_ioctl=&vfs_ioctl=&do_ioctl=最后调用filp-&f_op-&unlocked_ioctl执行具体的ioctl操作,该操作就是sock_ioctl,至于为什么是sock_ioctl,后边作了进一步分析sock_ioctl=&{&&& ...&&& #ifdef CONFIG_WIRELESS_EXT&&&&&&& if (cmd &= SIOCIWFIRST && cmd &= SIOCIWLAST) {&&&&&&&&&&& err = dev_ioctl(net, cmd, argp);//
&&&&&&& } else&&& #endif&&& ...}dev_ioctl=&wext_handle_ioctl{&&& .../* Take care of Wireless Extensions */&&& if (cmd &= SIOCIWFIRST && cmd &= SIOCIWLAST)&&&&&&& return wext_handle_ioctl(net, &ifr, cmd, arg);&&& ...}wext_handle_ioctl=&wireless_process_ioctl=&然后通过if ((dev = __dev_get_by_name(net, ifr-&ifr_name)) == NULL)函数,从系统管理的net链表中,把ioctl指定的ethX对应的struct net_device摘出来,最后调用ioctl_private_call(handler)或者调用dev-&do_ioctl(dev, ifr, cmd)来处理该ioctl,这两个函数分别指向wlan_handler_def和wlan_do_ioctl====================3.wifi网卡是怎么登记到kernel上的wlan_probe()=&wlan_add_card()=&alloc_etherdev()=&之后将操作方法添加到struct net_device *dev=alloc_etherdev()申请的dev上去,其中包括:&&& ...&&& /* Setup the OS Interface to our functions */&&& dev-&open = wlan_&&& dev-&hard_start_xmit = wlan_hard_start_&&& dev-&stop = wlan_&&& dev-&do_ioctl = wlan_do_&&& dev-&set_mac_address = wlan_set_mac_
&&& dev-&tx_timeout = wlan_tx_&&& dev-&get_stats = wlan_get_&&& dev-&watchdog_timeo = MRVDRV_DEFAULT_WATCHDOG_TIMEOUT;&&& dev-&wireless_handlers = (struct iw_handler_def *) &wlan_handler_&&& dev-&set_multicast_list = wlan_set_multicast_&&& ...4.socket系统调用如何关联上ioctl和ethX设备
asmlinkage long sys_socket(int family, int type, int protocol);
sys_socket=&sock_create=&__sock_create=&sock =
sock_alloc();通过sock_mnt-&mnt_sb从socket文件系统的超级块上申请一个inode节点,这样也就同时获得了由
该inode描述的一个sock结构体单元,所以sokcet和dentry目录项等效,接下来从net_families全局管理结构体中找到当前family对应的ops操作集,net_proto_family *pf=net_families[family];pf-&create(net, sock, protocol);//核心调用,对于ipv4,就是inet_create以ipv4为例static struct net_proto_family inet_family_ops = {&&& .family = PF_INET,&&& .create = inet_create,&&& .owner&&& = THIS_MODULE,};还记得上面应用层创建sokcet的函数吧,sockfd = socket(AF_INET, SOCK_STREAM, 0);//AF_INET虽然等于PF_INET,但是因为种种原因我们提倡使用PF_INET可见family等于AF_INET,type等于SOCK_STREAM,协议protocol为0,也就是采用IP协议,inet_create=&inetsw[sock-&type]也就是inetsw[SOCK_STREAM],从inetsw[sock-&type]中找到已经登记的protocol网络协议处理函数,inetsw[]是怎么填充的呢?inet_init()=&inet_register_protosw(inetsw_array)=&这样inetsw_array中的所有protocol处理模块都将登记到inetsw中了,static struct inet_protosw inetsw_array[] ={&&& {&&&&&&& .type = SOCK_STREAM,&&&&&&& .protocol = IPPROTO_TCP,&&&&&&& .prot = &tcp_prot,&&&&&&& .ops = &inet_stream_ops,&&&&&&& .capability = -1,&&&&&&& .no_check = 0,&&&&&&& .flags = INET_PROTOSW_PERMANENT | INET_PROTOSW_ICSK,&&& },
&&& {&&&&&&& .type = SOCK_DGRAM,&&&&&&& .protocol = IPPROTO_UDP,&&&&&&& .prot = &udp_prot,&&&&&&& .ops = &inet_dgram_ops,&&&&&&& .capability = -1,&&&&&&& .no_check = UDP_CSUM_DEFAULT,&&&&&&& .flags = INET_PROTOSW_PERMANENT,&&& },
&&& {&&&&&&& .type = SOCK_RAW,&&&&&&& .protocol = IPPROTO_IP,&&& /* wild card */&&&&&&& .prot = &raw_prot,&&&&&&& .ops = &inet_sockraw_ops,&&&&&&& .capability = CAP_NET_RAW,&&&&&&& .no_check = UDP_CSUM_DEFAULT,&&&&&&& .flags = INET_PROTOSW_REUSE,&&& }};至
于inet_init,则是以fs_initcall(inet_init)方式,以5号优先级被build
in到了内核中,当kernel启动时会在start_kernel=&rest_init=&kernel_init=&
do_basic_setup=&do_initcalls中依据优先级号优先于其他module驱动被调用.这样sock-&ops = answer-&对于ipv4也就等于inet_stream_ops,接下来就是将ops填充到file操作指针中了,sys_socket=&sock_map_fd=&sock_attach_fd=&dentry-&d_op = &sockfs_dentry_init_file(file, sock_mnt, dentry, FMODE_READ | FMODE_WRITE, &socket_file_ops);file-&private_data =其中init_file=&file-&f_op =也就是file-&f_op = socket_file_所以read(),wirte(),poll()和ioctl()应用程序调用的file-&f_op就是socket_file_ops了,比如:read()对应sock_aio_read网络异步读write()对应sock_aio_write网络异步写ioctl()对应sock_ioctl
socket_file_ops结构体具体实现如下:static const struct file_operations socket_file_ops = {&&& .owner =&&& THIS_MODULE,&&& .llseek =&&& no_llseek,&&& .aio_read =&&& sock_aio_read,&&& .aio_write =&&& sock_aio_write,&&& .poll =&&&&&&& sock_poll,&&& .unlocked_ioctl = sock_ioctl,#ifdef CONFIG_COMPAT&&& .compat_ioctl = compat_sock_ioctl,#endif&&& .mmap =&&&&&&& sock_mmap,&&& .open =&&&&&&& sock_no_open,&&& /* special open code to disallow open via /proc */&&& .release =&&& sock_close,&&& .fasync =&&& sock_fasync,&&& .sendpage =&&& sock_sendpage,&&& .splice_write = generic_splice_sendpage,};网卡控制因为涉及到的知识点比较多,上面只是从宏观上对数据流程做了一个简单的介绍,深入到其中的每个知识点,都会牵扯出一系列文章,读者需要自己去一个个的慢慢深入,希望本文能够对刚刚接触网络驱动的读者有所帮助和启发【gliethttp.Leith】
wireless extention扩展接口Blog作者的回复:wlan_add_card=&wlan_create_thread(wlan_service_main_thread, &priv-&MainThread, "wlan_main_service");=&wlan_service_main_thread=&wlan_exec_next_cmd=&将调用wlan_enter_ps和wlan_exit_ps
sbi_interrupt=&从sdio口上传来的中断数据,sdio_irq_thread=&process_sdio_pending_irqs=&调用func-&irq_handler(func);即本.在mmc_signal_sdio_irq=&将调用wake_up_process(host-&sdio_irq_thread);来唤醒该irq处理线程,可能还有其他命令需要处理wlan_exec_next_cmd这个pxamci_irq就是mmc的物理irq中断了,pxamci_irq=&mmc_signal_sdio_irq(host-&mmc);
wlan_exec_next_cmd=&只要cmd链表上CmdNode还存在,那么就会执行wlan_dnld_cmd_to_fw(wlan_private * priv, CmdCtrlNode * CmdNode)将CmdNode中的数据下发下去,然后重新触发wlan_mod_timer(&Adapter-&MrvDrvCommandTimer, MRVDRV_TIMER_5S);也就是wlan_cmd_timeout_func命令超时处理函数,在cmd已经有了恢复之后,在主线程中调用wlan_process_cmdresp,立即调用wlan_cancel_timer(&Adapter-&MrvDrvCommandTimer);来删除定时器
wlan_service_main_thread=&每次唤醒都会检查====&&& /* Execute the next command */&&& if (!priv-&wlan_dev.cmd_sent && !Adapter-&CurCmd)&&&&&&& wlan_exec_next_cmd(priv);====
wlan_prepare_cmd=&wlan_hostcmd_ioctl=&获取一个空闲的CmdNode节点wlan_get_cmd_node,当完成赋值之后,执行如下语句,将CmdNode节点添加到处理队列中:wlan_insert_cmd_to_pending_q(Adapter, CmdNode, TRUE);wake_up_interruptible(&priv-&MainThread.waitQ);另外在数组中/*&* iwconfig settable callbacks &*/static const iw_handler wlan_handler[]这个数组中全部是回调函数,
/** wlan_handler_def */struct iw_handler_def wlan_handler_def = {& num_standard:sizeof(wlan_handler) / sizeof(iw_handler),& num_private:sizeof(wlan_private_handler) / sizeof(iw_handler),& num_private_args:sizeof(wlan_private_args) / sizeof(struct iw_priv_args),& standard:(iw_handler *) wlan_handler,& private:(iw_handler *) wlan_private_handler,& private_args:(struct iw_priv_args *) wlan_private_args,#if WIRELESS_EXT & 20& get_wireless_stats:wlan_get_wireless_stats,#endif};在wlan_add_card函数中dev-&wireless_handlers = (struct iw_handler_def *) &wlan_handler_
===============在kernel的net中使用wireless extention扩展接口
static iw_handler get_handler(struct net_device *dev, unsigned int cmd){&&& /* Don't "optimise" the following variable, it will crash */&&& unsigned int&&&&&&&&&& /* *MUST* be unsigned */
&&& /* Check if we have some wireless handlers defined */&&& if (dev-&wireless_handlers == NULL)&&&&&&& return NULL;
&&& /* Try as a standard command */&&& index = cmd - SIOCIWFIRST;&&& if (index & dev-&wireless_handlers-&num_standard)&&&&&&& return dev-&wireless_handlers-&standard[index];
&&& /* Try as a private command */&&& index = cmd - SIOCIWFIRSTPRIV;&&& if (index & dev-&wireless_handlers-&num_private)&&&&&&& return dev-&wireless_handlers-&private[index];
&&& /* Not found */&&& return NULL;}
=&sock_ioctl=&dev_ioctl+++/* Take care of Wireless Extensions */+++if (cmd &= SIOCIWFIRST && cmd &= SIOCIWLAST)+++return wext_handle_ioctl(net, &ifr, cmd, arg);=&wext_handle_ioctl=&wireless_process_ioctl(struct net *net, struct ifreq *ifr, unsigned int cmd)=&get_handler(dev, cmd);如果没有实现该cmd,那么将调用dev-&do_ioctl来处理,
wlan_reassoc_timer_func=&wmm_start_queue=&wlan_tx_packet=&wlan_tx_timeout=&wlan_remove_card=&wlan_hostcmd_ioctl=&wlan_auto_deep_sleep=&wlan_set_deep_sleep=&wlan_prepare_cmd=&wlan_cmd_timeout_func=&将调用wake_up_interruptible(&priv-&MainThread.waitQ);唤醒wlan_service_main_thread主处理线程.
wlan_hard_start_xmit=&wlan_tx_packet发送数据包dev-&tx_timeout = wlan_tx_wlan_initialize_timer(&Adapter-&MrvDrvCommandTimer, wlan_cmd_timeout_func, priv);
int wlan_do_ioctl(struct net_device *dev, struct ifreq *req, int cmd){&&& ...&&&&&&& case WLAN_WAKEUP_MT:&&&&&&&&&&& if (wrq-&u.data.length & 0)&&&&&&&&&&&&&&& Adapter-&IntCounter++;&&&&&&&&&&& wake_up_interruptible(&priv-&MainThread.waitQ);&&&&&&&&&&&&&& ...}
在wlan_process_cmdresp()处理完该cmd之后,调用wlan_insert_cmd_to_free_q=&wlan_clean_cmd_noder,从命令链表上删除已经处理完成的cmd_node,wlan_clean_cmd_noder然后pTempNode-&CmdWaitQWoken = TRUE;同时如果该cmd_node是一个被阻塞等待的,那么唤醒等待的程序.wake_up_interruptible(&pTempNode-&cmdwait_q);
Available private ioctls :&&&&&&&&& set&&&&&&&&&&&&& (8BE2) : set 1024 char& & get&& 0&&&&&&&&& connStatus&&&&&& (0004) : set 1024 char& & get 2047 char&&&&&&&&& driverVer&&&&&&& (0005) : set 1024 char& & get 2047 char&&&&&&&&& bainfo&&&&&&&&&& (0006) : set 1024 char& & get 2047 char&&&&&&&&& descinfo&&&&&&&& (0007) : set 1024 char& & get 2047 char&&&&&&&&& radio_off&&&&&&& (000A) : set 1024 char& & get 2047 char&&&&&&&&& radio_on&&&&&&&& (000B) : set 1024 char& & get 2047 char&&&&&&&&& show&&&&&&&&&&&& (0015) : set 1024 char& & get 2047 char&&&&&&&&& adhocEntry&&&&&& (0016) : set 1024 char& & get 2047 char&&&&&&&&& bbp&&&&&&&&&&&&& (8BE3) : set 2047 char& & get 2047 char&&&&&&&&& mac&&&&&&&&&&&&& (8BE5) : set 1024 char& & get 1024 char&&&&&&&&& rf&&&&&&&&&&&&&& (8BF3) : set 2047 char& & get 2047 char&&&&&&&&& e2p&&&&&&&&&&&&& (8BE7) : set 1024 char& & get 1024 char&&&&&&&&& stat&&&&&&&&&&&& (8BE9) : set&& 0&&&&&& & get 2047 char
‍&&&&&&&&& get_site_survey& (8BED) : set&& 0&&&&&& & get 1024 char&&& 查看网络状态&&&&&&&&&
Connect to stongest open AP
设置命令&&&&&&&&& iwpriv ra0 set SSID="" iwpriv ra0 set Channel=0 iwpriv ra0 set NetworkType=Infra iwpriv ra0 set AuthMode=SHARED iwpriv ra0 set EncrypType=WEP iwpriv ra0 set DefaultKeyID=1 iwpriv ra0 set Key1="whatever" iwpriv ra0 set SSID="some_ssed" iwpriv ra0 set WPAPSK="wpa_key"
‍显示命令
iwpriv ra0 show SSID
iwpriv ra0&show Channel iwpriv ra0&show NetworkType
iwpriv ra0&show AuthMode
iwpriv ra0&show EncrypType
iwpriv ra0 show DefaultKeyID iwpriv ra0&show Key1&iwpriv ra0&show WPAPSK
./iwpriv ra0 show&&& 无线网卡功能参数ra0&&&&&& show:SSIDWirelessModeTxBurstTxPreambleTxPowerChannelBGProtectionRTSThresholdFragThresholdHtBwHtMcsHtGiHtOpModeHtExtchaHtMpduDensityHtBaWinSizeHtRdgHtAmsduHtAutoBaCountryRegionCountryRegionABandCountryCodePktAggregateWmmCapableIEEE80211HNetworkTypeWPAPSKAutoReconnectAuthModeEncrypTypeDefaultKeyIDKey1Key2Key3Key4PMK轉自：/fghzone/blog/item/a57ff8.html
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