Function key_sendup_mbuf

freebsd/netipsec/keysock.c:176–263

so can be NULL if target != KEY_SENDUP_ONE */

/* so can be NULL if target != KEY_SENDUP_ONE */
int
key_sendup_mbuf(struct socket *so, struct mbuf *m, int target)
{
	struct mbuf *n;
	struct keycb *kp;
	struct rawcb *rp;
	int error = 0;

	KASSERT(m != NULL, ("NULL mbuf pointer was passed."));
	KASSERT(so != NULL || target != KEY_SENDUP_ONE,
	    ("NULL socket pointer was passed."));
	KASSERT(target == KEY_SENDUP_ONE || target == KEY_SENDUP_ALL ||
	    target == KEY_SENDUP_REGISTERED, ("Wrong target %d", target));

	PFKEYSTAT_INC(in_total);
	PFKEYSTAT_ADD(in_bytes, m->m_pkthdr.len);
	if (m->m_len < sizeof(struct sadb_msg)) {
		m = m_pullup(m, sizeof(struct sadb_msg));
		if (m == NULL) {
			PFKEYSTAT_INC(in_nomem);
			return ENOBUFS;
		}
	}
	if (m->m_len >= sizeof(struct sadb_msg)) {
		struct sadb_msg *msg;
		msg = mtod(m, struct sadb_msg *);
		PFKEYSTAT_INC(in_msgtype[msg->sadb_msg_type]);
	}
	mtx_lock(&rawcb_mtx);
	if (V_key_cb.any_count == 0) {
		mtx_unlock(&rawcb_mtx);
		m_freem(m);
		return (0);
	}
	LIST_FOREACH(rp, &V_rawcb_list, list)
	{
		if (rp->rcb_proto.sp_family != PF_KEY)
			continue;
		if (rp->rcb_proto.sp_protocol
		 && rp->rcb_proto.sp_protocol != PF_KEY_V2) {
			continue;
		}

		/*
		 * If you are in promiscuous mode, and when you get broadcasted
		 * reply, you'll get two PF_KEY messages.
		 * (based on pf_key@inner.net message on 14 Oct 1998)
		 */
		kp = (struct keycb *)rp;
		if (kp->kp_promisc) {
			n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
			if (n != NULL)
				key_sendup0(rp, n, 1);
			else
				PFKEYSTAT_INC(in_nomem);
		}

		/* the exact target will be processed later */