Send an Ethernet data frame on linux

Send an Ethernet data frame on the linux platform-general Linux technology-Linux technology and application information. The following is a detailed description. # Include
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# DefineIFALIASZ256
Typedef char INT8;

# Define VSTRONG_PROTOCOL 0x0807
# Define DEBUGMSG (cond, printf_exp)
Int main (int argc, char ** argv ){
Int I, send_flag = 0;
Struct sockaddr_ll stTagAddr;
Char szBuff [68];
Memset (& stTagAddr, 0, sizeof (stTagAddr ));
StTagAddr. sll_family = PF_PACKET; // enter AF_PACKET, which is no longer processed by the protocol layer.
StTagAddr. sll_protocol = htons (VSTRONG_PROTOCOL );
Int ret;
Int ERR;
Struct ifreq req;
Int sd;
Sd = socket (AF_PACKET, SOCK_RAW, htons (ETH_P_IP); // This sd is used to obtain the index of eth0. When it is finished, close d = socket (PF_INET, SOCK_DGRAM, 0) AF_INET, SOCK_DGRAM, 0 SOCK_PACKET
Strncpy (req. ifr_name, "eth0", 4); // obtain the index using the device name
Ret = ioctl (sd, SIOCGIFFLAGS, & req );

// Close (sd );
If (ret =-1)
{
DEBUGMSG (1, ("Level: % d [Searcher main] Get eth0 index err \ n", ERR ));
}
StTagAddr. sll_ifindex = req. ifr_ifindex; // the index of the eth0 Nic, which is very important for the system to send data to the NIC.
StTagAddr. sll_pkttype = PACKET_OUTGOING; // The type of the Flag package is the outgoing package.
StTagAddr. sll_halen = 6; // The target MAC address length is 6.

// Enter the target MAC address
StTagAddr. sll_addr [0] = 0xff;
StTagAddr. sll_addr [1] = 0xff;
StTagAddr. sll_addr [2] = 0xff;
StTagAddr. sll_addr [3] = 0xff;
StTagAddr. sll_addr [4] = 0xff;
StTagAddr. sll_addr [5] = 0xff;

// Fill in the frame header and content

Memset (szBuff, 1, 68 );

For (I = 0; I <68; I ++)
Printf ("% d \ n", szBuff );
Send_flag = sendto (sd, (INT8 *) szBuff, sizeof (szBuff), 0, (const struct sockaddr *) & stTagAddr, sizeof (stTagAddr ));
}
This is my changed program. send_flag returns-1.