Index: uspace/lib/c/generic/iplink.c
===================================================================
--- uspace/lib/c/generic/iplink.c	(revision bc385789c90bd429765abebdb70ac2057bcf31db)
+++ uspace/lib/c/generic/iplink.c	(revision bc385789c90bd429765abebdb70ac2057bcf31db)
@@ -0,0 +1,166 @@
+/*
+ * Copyright (c) 2012 Jiri Svoboda
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** @addtogroup libc
+ * @{
+ */
+/**
+ * @file
+ * @brief IP link client stub
+ */
+
+#include <async.h>
+#include <assert.h>
+#include <errno.h>
+#include <inet/iplink.h>
+#include <ipc/iplink.h>
+#include <ipc/services.h>
+#include <loc.h>
+#include <stdlib.h>
+
+static void iplink_cb_conn(ipc_callid_t iid, ipc_call_t *icall, void *arg);
+
+int iplink_open(async_sess_t *sess, iplink_ev_ops_t *ev_ops,
+    iplink_t **riplink)
+{
+	iplink_t *iplink = NULL;
+	int rc;
+
+	iplink = calloc(1, sizeof(iplink_t));
+	if (iplink == NULL)
+		return ENOMEM;
+
+	iplink->sess = sess;
+	iplink->ev_ops = ev_ops;
+
+	async_exch_t *exch = async_exchange_begin(sess);
+
+	rc = async_connect_to_me(exch, 0, 0, 0, iplink_cb_conn, iplink);
+	async_exchange_end(exch);
+
+	if (rc != EOK)
+		goto error;
+
+	*riplink = iplink;
+	return EOK;
+
+error:
+	if (iplink != NULL)
+		free(iplink);
+
+	return rc;
+}
+
+void iplink_close(iplink_t *iplink)
+{
+	/* XXX Synchronize with iplink_cb_conn */
+	free(iplink);
+}
+
+int iplink_send(iplink_t *iplink, iplink_sdu_t *sdu)
+{
+	async_exch_t *exch = async_exchange_begin(iplink->sess);
+
+	ipc_call_t answer;
+	aid_t req = async_send_2(exch, IPLINK_SEND, sdu->src.ipv4,
+	    sdu->dest.ipv4, &answer);
+	int rc = async_data_write_start(exch, sdu->data, sdu->size);
+	async_exchange_end(exch);
+
+	if (rc != EOK) {
+		async_wait_for(req, NULL);
+		return rc;
+	}
+
+	sysarg_t retval;
+	async_wait_for(req, &retval);
+	if (retval != EOK)
+		return retval;
+
+	return EOK;
+}
+
+int iplink_get_mtu(iplink_t *iplink, size_t *rmtu)
+{
+	sysarg_t mtu;
+	async_exch_t *exch = async_exchange_begin(iplink->sess);
+
+	int rc = async_req_0_1(exch, IPLINK_GET_MTU, &mtu);
+	async_exchange_end(exch);
+
+	if (rc != EOK)
+		return rc;
+
+	*rmtu = mtu;
+	return EOK;
+}
+
+static void iplink_ev_recv(iplink_t *iplink, ipc_callid_t callid,
+    ipc_call_t *call)
+{
+	int rc;
+	iplink_sdu_t sdu;
+
+	sdu.src.ipv4 = IPC_GET_ARG1(*call);
+	sdu.dest.ipv4 = IPC_GET_ARG2(*call);
+
+	rc = async_data_write_accept(&sdu.data, false, 0, 0, 0, &sdu.size);
+	if (rc != EOK) {
+		async_answer_0(callid, rc);
+		return;
+	}
+
+	rc = iplink->ev_ops->recv(iplink, &sdu);
+	async_answer_0(callid, rc);
+}
+
+static void iplink_cb_conn(ipc_callid_t iid, ipc_call_t *icall, void *arg)
+{
+	iplink_t *iplink = (iplink_t *)arg;
+
+	while (true) {
+		ipc_call_t call;
+		ipc_callid_t callid = async_get_call(&call);
+
+		if (!IPC_GET_IMETHOD(call)) {
+			/* TODO: Handle hangup */
+			return;
+		}
+
+		switch (IPC_GET_IMETHOD(call)) {
+		case IPLINK_EV_RECV:
+			iplink_ev_recv(iplink, callid, &call);
+			break;
+		default:
+			async_answer_0(callid, ENOTSUP);
+		}
+	}
+}
+
+/** @}
+ */
Index: uspace/lib/c/generic/iplink_srv.c
===================================================================
--- uspace/lib/c/generic/iplink_srv.c	(revision bc385789c90bd429765abebdb70ac2057bcf31db)
+++ uspace/lib/c/generic/iplink_srv.c	(revision bc385789c90bd429765abebdb70ac2057bcf31db)
@@ -0,0 +1,143 @@
+/*
+ * Copyright (c) 2012 Jiri Svoboda
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** @addtogroup libc
+ * @{
+ */
+/**
+ * @file
+ * @brief IP link server stub
+ */
+#include <errno.h>
+#include <ipc/iplink.h>
+#include <stdlib.h>
+#include <sys/types.h>
+
+#include <inet/iplink_srv.h>
+
+static void iplink_get_mtu_srv(iplink_conn_t *conn, ipc_callid_t callid,
+    ipc_call_t *call)
+{
+	int rc;
+	size_t mtu;
+
+	rc = conn->srv->ops->get_mtu(conn, &mtu);
+	async_answer_1(callid, rc, mtu);
+}
+
+static void iplink_send_srv(iplink_conn_t *conn, ipc_callid_t callid,
+    ipc_call_t *call)
+{
+	iplink_srv_sdu_t sdu;
+	int rc;
+
+	sdu.src.ipv4 = IPC_GET_ARG1(*call);
+	sdu.dest.ipv4 = IPC_GET_ARG2(*call);
+
+	rc = async_data_write_accept(&sdu.data, false, 0, 0, 0, &sdu.size);
+	if (rc != EOK) {
+		async_answer_0(callid, rc);
+		return;
+	}
+
+	rc = conn->srv->ops->send(conn, &sdu);
+	free(sdu.data);
+	async_answer_0(callid, rc);
+}
+
+int iplink_conn(ipc_callid_t iid, ipc_call_t *icall, void *arg)
+{
+	iplink_srv_t *srv = (iplink_srv_t *)arg;
+	iplink_conn_t conn;
+	int rc;
+
+	/* Accept the connection */
+	async_answer_0(iid, EOK);
+
+	async_sess_t *sess = async_callback_receive(EXCHANGE_SERIALIZE);
+	if (sess == NULL)
+		return ENOMEM;
+
+	conn.srv = srv;
+	conn.client_sess = sess;
+
+	rc = srv->ops->open(&conn);
+	if (rc != EOK)
+		return rc;
+
+	while (true) {
+		ipc_call_t call;
+		ipc_callid_t callid = async_get_call(&call);
+		sysarg_t method = IPC_GET_IMETHOD(call);
+
+		if (!method) {
+			/* The other side has hung up */
+			async_answer_0(callid, EOK);
+			break;
+		}
+
+		switch (method) {
+		case IPLINK_GET_MTU:
+			iplink_get_mtu_srv(&conn, callid, &call);
+			break;
+		case IPLINK_SEND:
+			iplink_send_srv(&conn, callid, &call);
+			break;
+		default:
+			async_answer_0(callid, EINVAL);
+		}
+	}
+
+	return srv->ops->close(&conn);
+}
+
+int iplink_ev_recv(iplink_conn_t *conn, iplink_srv_sdu_t *sdu)
+{
+	async_exch_t *exch = async_exchange_begin(conn->client_sess);
+
+	ipc_call_t answer;
+	aid_t req = async_send_2(exch, IPLINK_EV_RECV, sdu->src.ipv4,
+	    sdu->dest.ipv4, &answer);
+	int rc = async_data_write_start(exch, sdu->data, sdu->size);
+	async_exchange_end(exch);
+
+	if (rc != EOK) {
+		async_wait_for(req, NULL);
+		return rc;
+	}
+
+	sysarg_t retval;
+	async_wait_for(req, &retval);
+	if (retval != EOK)
+		return retval;
+
+	return EOK;
+}
+
+/** @}
+ */