static int ksocket_receive(struct socket* sock, struct sockaddr_in* addr, unsigned char* buf, int len)
{
    struct msghdr msg;
    mm_segment_t oldfs;
    int size = 0;

    if (sock->sk == NULL) return 0;

    msg.msg_flags = 0;
    msg.msg_name = addr;
    msg.msg_namelen  = sizeof(struct sockaddr_in);
    msg.msg_control = NULL;
    msg.msg_controllen = 0;
    msg.msg_iocb = NULL;

    oldfs = get_fs();
    set_fs(KERNEL_DS);
    size = sock_recvmsg(sock,&msg,len,msg.msg_flags);
    set_fs(oldfs);

    return size;
}