修改mac地址

设置网卡网速

int phy_mii_ioctl(struct phy_device *phydev,
struct mii_ioctl_data *mii_data, int cmd)
{
u16 val = mii_data->val_in;

switch (cmd) {
case SIOCGMIIPHY:
mii_data->phy_id = phydev->addr;
break;
case SIOCGMIIREG:
mii_data->val_out = phy_read(phydev, mii_data->reg_num);
break;

case SIOCSMIIREG:
if (!capable(CAP_NET_ADMIN))
return -EPERM;

if (mii_data->phy_id == phydev->addr) {
switch(mii_data->reg_num) {
case MII_BMCR:
if (val & (BMCR_RESET|BMCR_ANENABLE))
phydev->autoneg = AUTONEG_DISABLE;
else
phydev->autoneg = AUTONEG_ENABLE;
if ((!phydev->autoneg) && (val & BMCR_FULLDPLX))
phydev->duplex = DUPLEX_FULL;
else
phydev->duplex = DUPLEX_HALF;
if ((!phydev->autoneg) &&
(val & BMCR_SPEED1000))
phydev->speed = SPEED_1000;
else if ((!phydev->autoneg) &&
(val & BMCR_SPEED100))
phydev->speed = SPEED_100;
break;
case MII_ADVERTISE:
phydev->advertising = val;
break;
default:
/* do nothing */
break;
}
}

phy_write(phydev, mii_data->reg_num, val);

if (mii_data->reg_num == MII_BMCR
&& val & BMCR_RESET
&& phydev->drv->config_init)
phydev->drv->config_init(phydev);
break;
}

return 0;
}

发这个ioctl来设置SIOCSMIIREG

ifconfig修改mac地址

有三种方法：

方法一：

1.关闭网卡设备

ifconfig eth0 down

2.修改MAC地址

ifconfig eth0 hw ether 00:AA:BB:CC:DD:11

3.重启网卡

ifconfig eth0 up

service network restart

方法三：

很简单的，只是在./etc/sysconfig/network-scripts/ifcfg-eth0中加入下面一句话：

MACADDR=00:AA:BB:CC:DD:EE

SIOCSIFHWADDR 设置mac地址

用ioctl控制，通过SIOCGIFHWADDR获取MAC地址，SIOCSIFHWADDR设置MAC地址，不过在设

置MAC地址之前，要先把网卡down掉，设置好了以后，再UP起来

#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>

typedef signed   char   INT8S;
typedef unsigned char 	INT8U;
typedef signed   short  INT16S;
typedef unsigned short  INT16U;
typedef signed 	 int    INT32S;
typedef unsigned int    INT32U;

//add by lightd, 2014-06-04
//============================================================================
//Function:    ifconfig_ethx_down_API
//Description: 关闭本地指定网卡 - eg: ifconfig eth0 down
//Input:
//Output:
//Return:
//Others:	   None
//============================================================================
INT8S ifconfig_ethx_down_API(const INT8U *interface_name)
{
INT32S 		 sock_fd;
struct ifreq ifr;
int			 selector;

//传入参数合法性检测
if(interface_name == NULL)
{
fprintf(stdout, "%s:%d: args invalid!", __FUNCTION__, __LINE__);
return -1;
}

//禁止关闭回环
if(strncmp((char *)interface_name, (char *)"lo", 2) == 0)
{
fprintf(stdout, "%s:%d: You can't pull down interface lo!",  __FUNCTION__, __LINE__);
return 0;
}

sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
if(sock_fd < 0)
{
fprintf(stdout, "%s:%d: socket failed!",  __FUNCTION__, __LINE__);
return -2;
}

sprintf(ifr.ifr_name, "%s", interface_name);

if(ioctl(sock_fd, SIOCGIFFLAGS, &ifr) < 0)
{
fprintf(stdout, "%s:%d: ioctl failed 1!",  __FUNCTION__, __LINE__);
return -3;
}

selector = IFF_UP;
ifr.ifr_flags &= ~selector;
if(ioctl(sock_fd, SIOCSIFFLAGS, &ifr) < 0)
{
fprintf(stdout, "%s:%d: ioctl failed 2!",  __FUNCTION__, __LINE__);
return -4;
}

close( sock_fd );

return 0;
}

//add by lightd, 2014-06-04
//============================================================================
//Function:    ifconfig_ethx_up_API
//Description: 打开本地指定网卡 - eg: ifconfig eth0 up
//Input:
//Output:
//Return:
//Others:			 None
//============================================================================
INT8S ifconfig_ethx_up_API(const INT8U *interface_name)
{
INT32S		 	sock_fd;
struct ifreq 	ifr;
int			 	selector;

//传入参数合法性检测
if(interface_name == NULL)
{
fprintf(stdout, "%s:%d: args invalid!",  __FUNCTION__, __LINE__);
return -1;
}

sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
if(sock_fd < 0)
{
fprintf(stdout, "%s:%d: create socket failed!",  __FUNCTION__, __LINE__);
return -2;
}

sprintf(ifr.ifr_name, "%s", interface_name);
if(ioctl(sock_fd, SIOCGIFFLAGS, &ifr) < 0)
{
fprintf(stdout, "%s:%d: ioctl error 1",  __FUNCTION__, __LINE__);
return -3;
}

selector = (IFF_UP | IFF_RUNNING);
ifr.ifr_flags |= selector;
if(ioctl(sock_fd, SIOCSIFFLAGS, &ifr) < 0)
{
fprintf(stdout, "%s:%d: ioctl error 2",  __FUNCTION__, __LINE__);
return -4;
}

close( sock_fd );

return 0;
}

//add by lightd, 2014-06-04
//============================================================================
//Function:    SetLocalMACAddr_API
//Description: 设置本地指定网卡的MAC
//Input:
//Output:
//Return:
//Others:	   None
//Test result: 测试结果 - 连续调用20次不出错
//============================================================================
INT8S SetLocalMACAddr_API(const INT8U *interface_name, const INT8U *str_macaddr)
{
int 			ret;
int 			sock_fd;
struct ifreq 	ifr;
INT32U 			mac2bit[6];

//传入参数合法性检测
if(interface_name == NULL || str_macaddr == NULL)
{
fprintf(stdout, "%s:%d: args invalid!",  __FUNCTION__, __LINE__);
return -1;
}

//提取mac格式
sscanf((char *)str_macaddr, "%02X:%02X:%02X:%02X:%02X:%02X", (INT8U *)&mac2bit[0], (INT8U *)&mac2bit[1], (INT8U *)&mac2bit[2], (INT8U *)&mac2bit[3], (INT8U *)&mac2bit[4], (INT8U *)&mac2bit[5]);

sock_fd = socket(PF_INET, SOCK_DGRAM, 0);
if (sock_fd < 0)
{
perror("socket error");
return -2;
}

//设置mac前，必须关闭对应的网卡 - 否则出错
ret = ifconfig_ethx_down_API( interface_name );
if(ret < 0)
{
fprintf(stdout, "%s:%d: close eth0 error",  __FUNCTION__, __LINE__);
return -3;
}
sleep(1); //等待网卡关闭OK

sprintf(ifr.ifr_ifrn.ifrn_name, "%s", interface_name);
ifr.ifr_ifru.ifru_hwaddr.sa_family = 1;
ifr.ifr_ifru.ifru_hwaddr.sa_data[0] = mac2bit[0];
ifr.ifr_ifru.ifru_hwaddr.sa_data[1] = mac2bit[1];
ifr.ifr_ifru.ifru_hwaddr.sa_data[2] = mac2bit[2];
ifr.ifr_ifru.ifru_hwaddr.sa_data[3] = mac2bit[3];
ifr.ifr_ifru.ifru_hwaddr.sa_data[4] = mac2bit[4];
ifr.ifr_ifru.ifru_hwaddr.sa_data[5] = mac2bit[5];

ret = ioctl(sock_fd, SIOCSIFHWADDR, &ifr);
if (ret != 0)
{
perror("set mac address erorr");
return -4;
}

close( sock_fd );

ret = ifconfig_ethx_up_API( interface_name );
if(ret < 0)
{
fprintf(stdout, "%s:%d: open eth0 error!",  __FUNCTION__, __LINE__);
return -5;
}

sleep(2); //等待网卡打开OK

return 0;
}

//add by lightd, 2014-06-04
//============================================================================
//Function:    GetLocalMACAddr_API
//Description: 获取本地指定网卡的MAC
//Input:
//Output:
//Return:
//Others:	   None
//============================================================================
INT8S GetLocalMACAddr_API(const INT8U *interface_name, INT8U *str_macaddr)
{
INT32S 		 sock_fd;
struct ifreq ifr_mac;

//传入参数合法性检测
if(interface_name == NULL || str_macaddr == NULL)
{
fprintf(stdout, "%s:%d: args invalid!",  __FUNCTION__, __LINE__);
return -1;
}

sock_fd = socket( AF_INET, SOCK_STREAM, 0 );
if( sock_fd == -1)
{
perror("create socket failed");
sprintf((char *)str_macaddr, "00:00:00:00:00:00");
return -2;
}

//指定网卡
memset(&ifr_mac, 0, sizeof(ifr_mac));
sprintf(ifr_mac.ifr_name, "%s", interface_name);

//获取指定网卡的mac地址
if( (ioctl( sock_fd, SIOCGIFHWADDR, &ifr_mac)) < 0 )
{
perror("mac ioctl error");
sprintf((char *)str_macaddr, "00:00:00:00:00:00");
return -3;
}

close( sock_fd );

sprintf((char *)str_macaddr,"%02x:%02x:%02x:%02x:%02x:%02x",
(unsigned char)ifr_mac.ifr_hwaddr.sa_data[0],
(unsigned char)ifr_mac.ifr_hwaddr.sa_data[1],
(unsigned char)ifr_mac.ifr_hwaddr.sa_data[2],
(unsigned char)ifr_mac.ifr_hwaddr.sa_data[3],
(unsigned char)ifr_mac.ifr_hwaddr.sa_data[4],
(unsigned char)ifr_mac.ifr_hwaddr.sa_data[5]);

printf("local mac:<%s> \n", str_macaddr);

return 0;
}

int main(void)
{
INT8U str_macaddr[20];

memset(str_macaddr, 0, sizeof(str_macaddr));
GetLocalMACAddr_API("eth0", str_macaddr);
fprintf(stdout, "1 mac: %s\n", str_macaddr);

//ifconfig_ethx_down_API("eth0");

//system("ifconfig eth0 down");
//usleep(500000);
//system("ifconfig eth0 up");
//usleep(500000);
//sleep(1); //10ms
//ifconfig_ethx_down_API("eth0");
//sleep(1);

SetLocalMACAddr_API("eth0", "08:00:11:22:33:44");
//ifconfig_ethx_up_API("eth0");
//ifconfig_ethx_up_API("eth0");
//sleep(2);

memset(str_macaddr, 0, sizeof(str_macaddr));
GetLocalMACAddr_API("eth0", str_macaddr);
fprintf(stdout, "2 mac: %s\n", str_macaddr);

system("ping 200.200.200.100");
//usleep(50000);
//ifconfig_ethx_down_API("eth0");
//ifconfig_ethx_up_API("eth0");

//memset(str_macaddr, 0, sizeof(str_macaddr));
//GetLocalMACAddr_API("eth0", str_macaddr);
fprintf(stdout, "2 mac: %s\n", str_macaddr);

return 0;
}

SIOCSMIIREG SIOCGMIIREG获取以及设置mac地址

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <linux/mii.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <linux/sockios.h>
#include <linux/types.h>
#include <netinet/in.h>

#define reteck(ret)     \
if(ret < 0){    \
printf("%m! \"%s\" : line: %d\n", __func__, __LINE__);   \
goto lab;   \
}

#define help() \
printf("mdio:\n");                  \
printf("read operation: mdio reg_addr\n");          \
printf("write operation: mdio reg_addr value\n");    \
printf("For example:\n");            \
printf("mdio eth0 1\n");             \
printf("mdio eth0 0 0x12\n\n");      \
exit(0);

int sockfd;

int main(int argc, char *argv[]){

if(argc == 1 || !strcmp(argv[1], "-h")){
help();
}

struct mii_ioctl_data *mii = NULL;
struct ifreq ifr;
int ret;

memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_name, argv[1], IFNAMSIZ - 1);

sockfd = socket(PF_LOCAL, SOCK_DGRAM, 0);
reteck(sockfd);

//get phy address in smi bus
ret = ioctl(sockfd, SIOCGMIIPHY, &ifr);
reteck(ret);

mii = (struct mii_ioctl_data*)&ifr.ifr_data;

if(argc == 3){

mii->reg_num    = (uint16_t)strtoul(argv[2], NULL, 0);

ret = ioctl(sockfd, SIOCGMIIREG, &ifr);
reteck(ret);

printf("read phy addr: 0x%x  reg: 0x%x   value : 0x%x\n\n", mii->phy_id, mii->reg_num, mii->val_out);
}else if(argc == 4){

mii->reg_num    = (uint16_t)strtoul(argv[2], NULL, 0);
mii->val_in     = (uint16_t)strtoul(argv[3], NULL, 0);

ret = ioctl(sockfd, SIOCSMIIREG, &ifr);
reteck(ret);

printf("write phy addr: 0x%x  reg: 0x%x  value : 0x%x\n\n", mii->phy_id, mii->reg_num, mii->val_in);
}

lab:
close(sockfd);
return 0;
}

很多人在read操作里面判断phy的link状态，

if(mii->val_out& 0x0004){

printf("linkup\n");

}else{

printf("linkdown\n");

}

Uboot通过bootm命令向内核传递MAC地址

一、内核参数的传递

向Linux驱动传递参数的方式有两种，一为在系统启动的时候由bootloader传入，还有一种是将驱动编译成模块，将参数作为模块加载的参数传入。

本系统使用的是由bootloader传入的方式。内核通过setup接口接受Bootloader传入的参数。方式如下：

static int __init param_mac_setup(char *str)

{

……

}

__setup("mac=", param_mac_setup);

这样，当在Bootloader中指定“mac=00:2E:79:38:6D:4E”，系统在加载这个模块的时候，就会执行相应的param_mac_setup()函数，而传入给它的参数就是等号后面的物理地址“00:2E:79:38:6D:4E”。这样，该函数就可以对它进行相应的处理。

二、bootm传递参数的方式

在bootm执行的流程图中，可以看到会调用do_bootm_linux()在执行Linux内核，内核的起始地址如下：

void (*theKernel)(int zero, int arch, uint params);

image_header_t *hdr = &header;

theKernel = (void (*)(int, int, uint))ntohl(hdr->ih_ep);

header是uImage的头部，通过头部，得到内核映像起始的执行地址，标识为theKernel。从中也可以看到，内核接受三个参数，第一个为0，第二个为系统的ID号，第三个是传入内核的参数。

在do_bootm_linux()的最后，会跳到内核去执行：

theKernel (0, bd->bi_arch_number, bd->bi_boot_params);

最后两个参数在board/smdk2410/smdk2410.c的board_init()中被初始化：

/* arch number of SMDK2410-Board */

gd->bd->bi_arch_number = MACH_TYPE_SMDK2410; /* 193 */

/* adress of boot parameters */

gd->bd->bi_boot_params = 0x30000100;

可以看到，uboot传给内核的参数表存放在内存中起始偏移0x100的位置，这里只是指定了“指针”的位置，但还没初始化其中的值，这是在do_bootm_linux()中跳到内核前去完成的。

值得注意的是， 内核的默认运行地址的0x30008000，前面就是留给参数用的。所以一般不要将内核下载到该地址之前，以免冲掉了传给内核的参数。

三、参数列表的构建

#if defined (CONFIG_SETUP_MEMORY_TAGS) || /

defined (CONFIG_CMDLINE_TAG) || /

defined (CONFIG_INITRD_TAG) || /

defined (CONFIG_SERIAL_TAG)

setup_start_tag (bd);

#ifdef CONFIG_SERIAL_TAG

setup_serial_tag (¶ms);

#endif

#ifdef CONFIG_REVISION_TAG

setup_revision_tag (¶ms);

#endif

#ifdef CONFIG_SETUP_MEMORY_TAGS

setup_memory_tags (bd);

#endif

#ifdef CONFIG_CMDLINE_TAG

setup_commandline_tag (bd, commandline);

#endif

#ifdef CONFIG_INITRD_TAG

if (initrd_start && initrd_end)

setup_initrd_tag (bd, initrd_start, initrd_end);

#endif

#if defined (CONFIG_VFD) || defined (CONFIG_LCD)

setup_videolfb_tag ((gd_t *) gd);

#endif

setup_end_tag (bd);

#endif

四、将MAC地址参数传入命令行参数

为了传入命令行参数，uboot所作的是：

char *commandline = getenv ("bootargs");

setup_commandline_tag (bd, commandline);

现在想要把MAC地址也加入到命令行参数中，只需要实现：

char *commandline = getenv ("bootargs") + “ mac=” + getenv ("ethaddr");

setup_commandline_tag (bd, commandline);

即可。这样就不需要每次在命令行后面手工追加MAC地址参数了。