Unable to add default root no such device error in linux

int main()
{
struct ifreq ifr;
struct ifconf ifc;
char buf[1024];
int success = 0;

int sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
if (sock == -1) { /* handle error*/ };

ifc.ifc_len = sizeof(buf);
ifc.ifc_buf = buf;
if (ioctl(sock, SIOCGIFCONF, &ifc) == -1) { /* handle error */ }

struct ifreq* it = ifc.ifc_req;
const struct ifreq* const end = it + (ifc.ifc_len / sizeof(struct ifreq));

for (; it != end; ++it) {
    strcpy(ifr.ifr_name, it->ifr_name);
    if (ioctl(sock, SIOCGIFFLAGS, &ifr) == 0) {
        if (! (ifr.ifr_flags & IFF_LOOPBACK)) { // don't count loopback
            if (ioctl(sock, SIOCGIFHWADDR, &ifr) == 0) {
                success = 1;
                break;
            }
        }
    }
    else { /* handle error */ }
}

unsigned char mac_address[6];

if (success) memcpy(mac_address, ifr.ifr_hwaddr.sa_data, 6);
}

docker exec -it -u root MS1 bash