Function key_attach

freebsd/netipsec/keysock.c:279–316

* key_attach() * derived from net/rtsock.c:rts_attach() */

 * derived from net/rtsock.c:rts_attach()
 */
static int
key_attach(struct socket *so, int proto, struct thread *td)
{
	struct keycb *kp;
	int error;

	KASSERT(so->so_pcb == NULL, ("key_attach: so_pcb != NULL"));

	if (td != NULL) {
		error = priv_check(td, PRIV_NET_RAW);
		if (error)
			return error;
	}

	/* XXX */
	kp = malloc(sizeof *kp, M_PCB, M_WAITOK | M_ZERO); 
	if (kp == NULL)
		return ENOBUFS;

	so->so_pcb = (caddr_t)kp;
	error = raw_attach(so, proto);
	kp = (struct keycb *)sotorawcb(so);
	if (error) {
		free(kp, M_PCB);
		so->so_pcb = (caddr_t) 0;
		return error;
	}

	kp->kp_promisc = kp->kp_registered = 0;

	if (kp->kp_raw.rcb_proto.sp_protocol == PF_KEY) /* XXX: AF_KEY */
		V_key_cb.key_count++;
	V_key_cb.any_count++;
	soisconnected(so);
	so->so_options |= SO_USELOOPBACK;

	return 0;
}

/*
 * key_bind()