Function send_input

freebsd/netinet6/send.c:260–303

* Send a SeND message to user space, that was either received and has to be * validated or was about to be send out and has to be handled by the SEND * daemon adding SeND ICMPv6 options. */

 * daemon adding SeND ICMPv6 options.
 */
static int
send_input(struct mbuf *m, struct ifnet *ifp, int direction, int msglen __unused)
{
	struct ip6_hdr *ip6;
	struct sockaddr_send sendsrc;

	SEND_LOCK();
	if (V_send_so == NULL) {
		SEND_UNLOCK();
		return (-1);
	}

	/*
	 * Make sure to clear any possible internally embedded scope before
	 * passing the packet to user space for SeND cryptographic signature
	 * validation to succeed.
	 */
	ip6 = mtod(m, struct ip6_hdr *);
	in6_clearscope(&ip6->ip6_src);
	in6_clearscope(&ip6->ip6_dst);

	bzero(&sendsrc, sizeof(sendsrc));
	sendsrc.send_len = sizeof(sendsrc);
	sendsrc.send_family = AF_INET6;
	sendsrc.send_direction = direction;
	sendsrc.send_ifidx = ifp->if_index;

	/*
	 * Send incoming or outgoing traffic to user space either to be
	 * protected (outgoing) or validated (incoming) according to rfc3971.
	 */
	SOCKBUF_LOCK(&V_send_so->so_rcv);
	if (sbappendaddr_locked(&V_send_so->so_rcv,
	    (struct sockaddr *)&sendsrc, m, NULL) == 0) {
		SOCKBUF_UNLOCK(&V_send_so->so_rcv);
		/* XXX stats. */
		m_freem(m);
	} else {
		sorwakeup_locked(V_send_so);
	}

	SEND_UNLOCK();
	return (0);
}

struct pr_usrreqs send_usrreqs = {
	.pru_attach =		send_attach,