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最新推荐文章于 2025-04-22 14:53:51 发布

原创最新推荐文章于 2025-04-22 14:53:51 发布 · 485 阅读

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#struct #structure #parameters #encoding #statistics #exchange

在kernel声明空间并赋值。
char *mem;
mem  = kmalloc(size, GFP_KERNEL);
memcpy(mem,source,size);
kfree(mem);
不然会出错。




定义枚举类
/*********************************/
typedef enum _IW_TYPE
{
     IW_POINT_TYPE=0,
     IW_PARAM_TYPE,
     IW_FREQ_TYPE,
} IW_TYPE;

IW_TYPE type;


/*********************************/


struct iw_request_info
{               
        __u16           cmd;            /* Wireless Extension command */
        __u16           flags;          /* More to come ;-) */
};

/* ------------------------ IOCTL REQUEST ------------------------ */
/*
* This structure defines the payload of an ioctl, and is used 
*/

862 union   iwreq_data
863 {
864         /* Config - generic */
865         char            name[IFNAMSIZ];
866         /* Name : used to verify the presence of  wireless extensions.
867          * Name of the protocol/provider... */
868 
869         struct iw_point essid;          /* Extended network name */
870         struct iw_param nwid;           /* network id (or domain - the cell) */
871         struct iw_freq  freq;           /* frequency or channel :
872                                          * 0-1000 = channel
873                                          * > 1000 = frequency in Hz */
874 
875         struct iw_param sens;           /* signal level threshold */
876         struct iw_param bitrate;        /* default bit rate */
877         struct iw_param txpower;        /* default transmit power */
878         struct iw_param rts;            /* RTS threshold threshold */
879         struct iw_param frag;           /* Fragmentation threshold */
880         __u32           mode;           /* Operation mode */
881         struct iw_param retry;          /* Retry limits & lifetime */
882 
883         struct iw_point encoding;       /* Encoding stuff : tokens */
884         struct iw_param power;          /* PM duration/timeout */
885         struct iw_quality qual;         /* Quality part of statistics */
886 
887         struct sockaddr ap_addr;        /* Access point address */
888         struct sockaddr addr;           /* Destination address (hw/mac) */
889 
890         struct iw_param param;          /* Other small parameters */
891         struct iw_point data;           /* Other large parameters */
892 };





894 /*
895  * The structure to exchange data for ioctl.
896  * This structure is the same as 'struct ifreq', but (re)defined for
897  * convenience...
898  * Do I need to remind you about structure size (32 octets) ?
899  */
900 struct  iwreq 
901 {
902         union
903         {
904                 char    ifrn_name[IFNAMSIZ];    /* if name, e.g. "eth0" */
905         } ifr_ifrn;
906 
907         /* Data part (defined just above) */
908         union   iwreq_data      u;
909 };





/* Send a single event to user space */


extern void wireless_send_event(struct net_device *dev, unsigned int  cmd, union iwreq_data *wrqu, char *extra);

struct net_device dev->flags 在ifconfig命令时候有用。



unsigned dev_get_flags(const struct net_device *dev)
int dev_change_flags(struct net_device *dev, unsigned flags)
example:
dev_change_flags(dev, dev->flags & ~IFF_UP);



netif_carrier_on(net_deviece **);
大多数涉及物理设备可以感知信号载波（carrier）的存在，载波的存在意味着设备可以工作
据个例子来讲：当一个用户拔掉了网线，也就意味着信号载波的消失
利用netif_carrier_on(net_device  * dev)，
netif_carrier_off(net_device * dev)，
这些关于载波的函数，你可以改变载波状态
netif_carrier_ok可以用来检测载波状态



netif_start_queue(net_device **);
函数告诉系统可以使用hard_start_xmit进行数据发送了