LinuxQuestions.org - Injecting packets ...sockets??

Hi all,
Friends I have built an IP packet and I need to inject this packet to another computer on the same LAN and hence with a different ethernet header. I have used sockets and managed to inject a raw packet on to the wire but what exactly I want is that the kernel should build the ethernet header for me.

Here is my code ...

Code:

inject(u_char *pkt, int nr)

{

/*open socket*/

fd = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL));

if (fd == -1)

{

printf("\nSocket failed!!");

}



if(setsockopt (fd, IPPROTO_IP, IP_HDRINCL, val, sizeof (one))<0)

printf("iphdrincl error");



/*Select interface*/

memset(&ifr, 0, sizeof(ifr));

strncpy (ifr.ifr_name, iftext, sizeof(ifr.ifr_name) - 1);

ifr.ifr_name[sizeof(ifr.ifr_name)-1] = '\0';



if (ioctl(fd, SIOCGIFINDEX, &ifr) == -1)

{

printf("No such interface: %s\n", iftext);

return -1;

}



ioctl(fd, SIOCGIFFLAGS, &ifr);



if ( (ifr.ifr_flags & IFF_UP) == 0)

{

printf("Interface %s is down\n", iftext);

return -1;

}



ioctl(fd, SIOCGIFINDEX, &ifr);

memset(&sa, 0, sizeof (sa));

sa.sll_family = AF_PACKET;

sa.sll_ifindex = ifr.ifr_ifindex;

sa.sll_protocol = htons(ETH_P_ALL);



/*Send*/

c = sendto(fd, pkt, nr, 0, (struct sockaddr *)&sa, sizeof (sa));

}

Note: The setsockopt() IP_HDRINCL option gives an error with errno = 92.

Please help me...any help will be appreciated.