Function ngc_send

freebsd/netgraph/ng_socket.c:218–363

}

static int
ngc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
	 struct mbuf *control, struct thread *td)
{
	struct ngpcb *const pcbp = sotongpcb(so);
	struct ngsock *const priv = NG_NODE_PRIVATE(pcbp->sockdata->node);
	struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr;
	struct ng_mesg *msg;
	struct mbuf *m0;
	item_p item;
	char *path = NULL;
	int len, error = 0;
	struct ng_apply_info apply;

	if (control) {
		error = EINVAL;
		goto release;
	}

	/* Require destination as there may be >= 1 hooks on this node. */
	if (addr == NULL) {
		error = EDESTADDRREQ;
		goto release;
	}

	/*
	 * Allocate an expendable buffer for the path, chop off
	 * the sockaddr header, and make sure it's NUL terminated.
	 */
	len = sap->sg_len - 2;
	path = malloc(len + 1, M_NETGRAPH_PATH, M_WAITOK);
	bcopy(sap->sg_data, path, len);
	path[len] = '\0';

	/*
	 * Move the actual message out of mbufs into a linear buffer.
	 * Start by adding up the size of the data. (could use mh_len?)
	 */
	for (len = 0, m0 = m; m0 != NULL; m0 = m0->m_next)
		len += m0->m_len;

	/*
	 * Move the data into a linear buffer as well.
	 * Messages are not delivered in mbufs.
	 */
	msg = malloc(len + 1, M_NETGRAPH_MSG, M_WAITOK);
	m_copydata(m, 0, len, (char *)msg);

	if (msg->header.version != NG_VERSION) {
		free(msg, M_NETGRAPH_MSG);
		error = EINVAL;
		goto release;
	}

	/*
	 * Hack alert!
	 * We look into the message and if it mkpeers a node of unknown type, we
	 * try to load it. We need to do this now, in syscall thread, because if