dst_addr.sin_len = sizeof(struct sockaddr_in);
//      dst_addr.sin_addr.s_addr = peer->dst.s_addr;
        inet_aton("192.168.0.1", &(dst_addr.sin_addr));
        dst_addr.sin_family = AF_INET;
        tolen = sizeof(struct sockaddr);

sendto(peer->sck, icmp_packet, iphdr->ip_len, 0, (struct sockaddr *)&dst_addr, sizeof(dst_addr));

...


ip_len: 48
SSIZE_MAX[2147483647] tolen[16] sizeof[16] 
sendto() Invalid argument