Beispiel #1
0
static void
soaio_process_sb(struct socket *so, struct sockbuf *sb)
{
	struct kaiocb *job;

	SOCKBUF_LOCK(sb);
	while (!TAILQ_EMPTY(&sb->sb_aiojobq) && soaio_ready(so, sb)) {
		job = TAILQ_FIRST(&sb->sb_aiojobq);
		TAILQ_REMOVE(&sb->sb_aiojobq, job, list);
		if (!aio_clear_cancel_function(job))
			continue;

		soaio_process_job(so, sb, job);
	}

	/*
	 * If there are still pending requests, the socket must not be
	 * ready so set SB_AIO to request a wakeup when the socket
	 * becomes ready.
	 */
	if (!TAILQ_EMPTY(&sb->sb_aiojobq))
		sb->sb_flags |= SB_AIO;
	sb->sb_flags &= ~SB_AIO_RUNNING;
	SOCKBUF_UNLOCK(sb);

	ACCEPT_LOCK();
	SOCK_LOCK(so);
	sorele(so);
}
Beispiel #2
0
/*
 * This does all of the accept except the final call to soaccept. The
 * caller will call soaccept after dropping its locks (soaccept may
 * call malloc).
 */
int
svc_vc_accept(struct socket *head, struct socket **sop)
{
	int error = 0;
	struct socket *so;

	if ((head->so_options & SO_ACCEPTCONN) == 0) {
		error = EINVAL;
		goto done;
	}
#ifdef MAC
	error = mac_socket_check_accept(curthread->td_ucred, head);
	if (error != 0)
		goto done;
#endif
	ACCEPT_LOCK();
	if (TAILQ_EMPTY(&head->so_comp)) {
		ACCEPT_UNLOCK();
		error = EWOULDBLOCK;
		goto done;
	}
	so = TAILQ_FIRST(&head->so_comp);
	KASSERT(!(so->so_qstate & SQ_INCOMP), ("svc_vc_accept: so SQ_INCOMP"));
	KASSERT(so->so_qstate & SQ_COMP, ("svc_vc_accept: so not SQ_COMP"));

	/*
	 * Before changing the flags on the socket, we have to bump the
	 * reference count.  Otherwise, if the protocol calls sofree(),
	 * the socket will be released due to a zero refcount.
	 * XXX might not need soref() since this is simpler than kern_accept.
	 */
	SOCK_LOCK(so);			/* soref() and so_state update */
	soref(so);			/* file descriptor reference */

	TAILQ_REMOVE(&head->so_comp, so, so_list);
	head->so_qlen--;
	so->so_state |= (head->so_state & SS_NBIO);
	so->so_qstate &= ~SQ_COMP;
	so->so_head = NULL;

	SOCK_UNLOCK(so);
	ACCEPT_UNLOCK();

	*sop = so;

	/* connection has been removed from the listen queue */
	KNOTE_UNLOCKED(&head->so_rcv.sb_sel.si_note, 0);
done:
	return (error);
}
Beispiel #3
0
/*ARGSUSED*/
static bool_t
svc_vc_rendezvous_recv(SVCXPRT *xprt, struct rpc_msg *msg,
    struct sockaddr **addrp, struct mbuf **mp)
{
	struct socket *so = NULL;
	struct sockaddr *sa = NULL;
	int error;
	SVCXPRT *new_xprt;

	/*
	 * The socket upcall calls xprt_active() which will eventually
	 * cause the server to call us here. We attempt to accept a
	 * connection from the socket and turn it into a new
	 * transport. If the accept fails, we have drained all pending
	 * connections so we call xprt_inactive().
	 */
	sx_xlock(&xprt->xp_lock);

	error = svc_vc_accept(xprt->xp_socket, &so);

	if (error == EWOULDBLOCK) {
		/*
		 * We must re-test for new connections after taking
		 * the lock to protect us in the case where a new
		 * connection arrives after our call to accept fails
		 * with EWOULDBLOCK. The pool lock protects us from
		 * racing the upcall after our TAILQ_EMPTY() call
		 * returns false.
		 */
		ACCEPT_LOCK();
		mtx_lock(&xprt->xp_pool->sp_lock);
		if (TAILQ_EMPTY(&xprt->xp_socket->so_comp))
			xprt_inactive_locked(xprt);
		mtx_unlock(&xprt->xp_pool->sp_lock);
		ACCEPT_UNLOCK();
		sx_xunlock(&xprt->xp_lock);
		return (FALSE);
	}

	if (error) {
		SOCKBUF_LOCK(&xprt->xp_socket->so_rcv);
		if (xprt->xp_upcallset) {
			xprt->xp_upcallset = 0;
			soupcall_clear(xprt->xp_socket, SO_RCV);
		}
		SOCKBUF_UNLOCK(&xprt->xp_socket->so_rcv);
		xprt_inactive(xprt);
		sx_xunlock(&xprt->xp_lock);
		return (FALSE);
	}

	sx_xunlock(&xprt->xp_lock);

	sa = 0;
	error = soaccept(so, &sa);

	if (error) {
		/*
		 * XXX not sure if I need to call sofree or soclose here.
		 */
		if (sa)
			free(sa, M_SONAME);
		return (FALSE);
	}

	/*
	 * svc_vc_create_conn will call xprt_register - we don't need
	 * to do anything with the new connection except derefence it.
	 */
	new_xprt = svc_vc_create_conn(xprt->xp_pool, so, sa);
	if (!new_xprt) {
		soclose(so);
	} else {
		SVC_RELEASE(new_xprt);
	}

	free(sa, M_SONAME);

	return (FALSE); /* there is never an rpc msg to be processed */
}
Beispiel #4
0
/*
 * XXX: Doing accept in a separate thread in each socket might not be the best way
 * 	to do stuff, but it's pretty clean and debuggable - and you probably won't
 * 	have hundreds of listening sockets anyway.
 */
static void
icl_accept_thread(void *arg)
{
	struct icl_listen_sock *ils;
	struct socket *head, *so;
	struct sockaddr *sa;
	int error;

	ils = arg;
	head = ils->ils_socket;

	ils->ils_running = true;

	for (;;) {
		ACCEPT_LOCK();
		while (TAILQ_EMPTY(&head->so_comp) && head->so_error == 0 && ils->ils_disconnecting == false) {
			if (head->so_rcv.sb_state & SBS_CANTRCVMORE) {
				head->so_error = ECONNABORTED;
				break;
			}
			error = msleep(&head->so_timeo, &accept_mtx, PSOCK | PCATCH,
			    "accept", 0);
			if (error) {
				ACCEPT_UNLOCK();
				ICL_WARN("msleep failed with error %d", error);
				continue;
			}
			if (ils->ils_disconnecting) {
				ACCEPT_UNLOCK();
				ICL_DEBUG("terminating");
				ils->ils_running = false;
				kthread_exit();
				return;
			}
		}
		if (head->so_error) {
			error = head->so_error;
			head->so_error = 0;
			ACCEPT_UNLOCK();
			ICL_WARN("socket error %d", error);
			continue;
		}
		so = TAILQ_FIRST(&head->so_comp);
		KASSERT(so != NULL, ("NULL so"));
		KASSERT(!(so->so_qstate & SQ_INCOMP), ("accept1: so SQ_INCOMP"));
		KASSERT(so->so_qstate & SQ_COMP, ("accept1: so not SQ_COMP"));

		/*
		 * Before changing the flags on the socket, we have to bump the
		 * reference count.  Otherwise, if the protocol calls sofree(),
		 * the socket will be released due to a zero refcount.
		 */
		SOCK_LOCK(so);			/* soref() and so_state update */
		soref(so);			/* file descriptor reference */

		TAILQ_REMOVE(&head->so_comp, so, so_list);
		head->so_qlen--;
		so->so_state |= (head->so_state & SS_NBIO);
		so->so_qstate &= ~SQ_COMP;
		so->so_head = NULL;

		SOCK_UNLOCK(so);
		ACCEPT_UNLOCK();

		sa = NULL;
		error = soaccept(so, &sa);
		if (error != 0) {
			ICL_WARN("soaccept error %d", error);
			if (sa != NULL)
				free(sa, M_SONAME);
			soclose(so);
			continue;
		}

		(ils->ils_listen->il_accept)(so, sa, ils->ils_id);
	}
}
Beispiel #5
0
/*
 * Handle the first completed incoming connection, assumed to be already
 * on the socket's so_comp queue.
 */
static void
ng_ksocket_finish_accept(priv_p priv)
{
	struct socket *const head = priv->so;
	struct socket *so;
	struct sockaddr *sa = NULL;
	struct ng_mesg *resp;
	struct ng_ksocket_accept *resp_data;
	node_p node;
	priv_p priv2;
	int len;
	int error;

	ACCEPT_LOCK();
	so = TAILQ_FIRST(&head->so_comp);
	if (so == NULL) {	/* Should never happen */
		ACCEPT_UNLOCK();
		return;
	}
	TAILQ_REMOVE(&head->so_comp, so, so_list);
	head->so_qlen--;
	so->so_qstate &= ~SQ_COMP;
	so->so_head = NULL;
	SOCK_LOCK(so);
	soref(so);
	sosetstate(so, SS_NBIO);
	SOCK_UNLOCK(so);
	ACCEPT_UNLOCK();

	/* XXX KNOTE(&head->so_rcv.sb_sel.si_note, 0); */

	soaccept(so, &sa);

	len = OFFSETOF(struct ng_ksocket_accept, addr);
	if (sa != NULL)
		len += sa->sa_len;

	NG_MKMESSAGE(resp, NGM_KSOCKET_COOKIE, NGM_KSOCKET_ACCEPT, len,
	    M_WAITOK | M_NULLOK);
	if (resp == NULL) {
		soclose(so);
		goto out;
	}
	resp->header.flags |= NGF_RESP;
	resp->header.token = priv->response_token;

	/* Clone a ksocket node to wrap the new socket */
        error = ng_make_node_common(&ng_ksocket_typestruct, &node);
        if (error) {
		kfree(resp, M_NETGRAPH);
		soclose(so);
		goto out;
	}

	if (ng_ksocket_constructor(node) != 0) {
		NG_NODE_UNREF(node);
		kfree(resp, M_NETGRAPH);
		soclose(so);
		goto out;
	}

	priv2 = NG_NODE_PRIVATE(node);
	priv2->so = so;
	priv2->flags |= KSF_CLONED | KSF_EMBRYONIC;

	/*
	 * Insert the cloned node into a list of embryonic children
	 * on the parent node.  When a hook is created on the cloned
	 * node it will be removed from this list.  When the parent
	 * is destroyed it will destroy any embryonic children it has.
	 */
	LIST_INSERT_HEAD(&priv->embryos, priv2, siblings);

	so->so_upcallarg = (caddr_t)node;
	so->so_upcall = ng_ksocket_incoming;
	SOCKBUF_LOCK(&so->so_rcv);
	so->so_rcv.sb_flags |= SB_UPCALL;
	SOCKBUF_UNLOCK(&so->so_rcv);
	SOCKBUF_LOCK(&so->so_snd);
	so->so_snd.sb_flags |= SB_UPCALL;
	SOCKBUF_UNLOCK(&so->so_snd);

	/* Fill in the response data and send it or return it to the caller */
	resp_data = (struct ng_ksocket_accept *)resp->data;
	resp_data->nodeid = NG_NODE_ID(node);
	if (sa != NULL)
		bcopy(sa, &resp_data->addr, sa->sa_len);
	NG_SEND_MSG_ID(error, node, resp, priv->response_addr, 0);

out:
	if (sa != NULL)
		kfree(sa, M_SONAME);
}
Beispiel #6
0
int
ofp_accept(int sockfd, struct ofp_sockaddr *addr, ofp_socklen_t *addrlen)
{
	struct ofp_sockaddr *sa = NULL;
	struct socket *so, *head = ofp_get_sock_by_fd(sockfd);
	if (!head) {
		ofp_errno = OFP_EBADF;
		return -1;
	}

	if ((head->so_options & OFP_SO_ACCEPTCONN) == 0) {
		ofp_errno = OFP_EINVAL;
		return -1;
	}

	ACCEPT_LOCK();
	if ((head->so_state & SS_NBIO) && OFP_TAILQ_EMPTY(&head->so_comp)) {
		ACCEPT_UNLOCK();
		ofp_errno = OFP_EWOULDBLOCK;
		return -1;
	}

	while (OFP_TAILQ_EMPTY(&head->so_comp) && head->so_error == 0) {
		if (head->so_rcv.sb_state & SBS_CANTRCVMORE) {
			head->so_error = OFP_ECONNABORTED;
			break;
		}
		if (ofp_msleep(&head->so_timeo, ofp_accept_mtx(), 0,
				 "accept", 0)) {
			ACCEPT_UNLOCK();
			return -1;
		}
	}

	if (head->so_error) {
		ofp_errno = head->so_error;
		head->so_error = 0;
		ACCEPT_UNLOCK();
		return -1;
	}
	so = OFP_TAILQ_FIRST(&head->so_comp);
	KASSERT(!(so->so_qstate & SQ_INCOMP), ("accept1: so SQ_INCOMP"));
	KASSERT(so->so_qstate & SQ_COMP, ("accept1: so not SQ_COMP"));

	/*
	 * Before changing the flags on the socket, we have to bump the
	 * reference count.  Otherwise, if the protocol calls ofp_sofree(),
	 * the socket will be released due to a zero refcount.
	 */
	OFP_SOCK_LOCK(so);			/* soref() and so_state update */
	soref(so);			/* file descriptor reference */

	OFP_TAILQ_REMOVE(&head->so_comp, so, so_list);
	head->so_qlen--;
	so->so_state |= (head->so_state & SS_NBIO);
	so->so_qstate &= ~SQ_COMP;
	so->so_head = NULL;

	OFP_SOCK_UNLOCK(so);
	ACCEPT_UNLOCK();

	/* connection has been removed from the listen queue */
	/*KNOTE_UNLOCKED(&head->so_rcv.sb_sel.si_note, 0);*/

	sa = 0;
	ofp_errno = ofp_soaccept(so, &sa);
	if (ofp_errno) {
		/*
		 * return a namelen of zero for older code which might
		 * ignore the return value from accept.
		 */
		if (addr)
			*addrlen = 0;
		return -1;
	}

	if (sa == NULL) {
		if (addr)
			*addrlen = 0;
		return so->so_number;
	}

	if (addr) {
		/* check sa_len before it is destroyed */
		if (*addrlen > sa->sa_len)
			*addrlen = sa->sa_len;
		memcpy(addr, sa, *addrlen);
	}

	free(sa);
	return so->so_number;
}