Index: uspace/srv/net/loopip/loopip.c
===================================================================
--- uspace/srv/net/loopip/loopip.c	(revision 606c36909b6993ba6c2ab0208a9d54e4aa98d7d3)
+++ uspace/srv/net/loopip/loopip.c	(revision 606c36909b6993ba6c2ab0208a9d54e4aa98d7d3)
@@ -0,0 +1,227 @@
+/*
+ * 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 loopip
+ * @{
+ */
+/**
+ * @file
+ * @brief Loopback IP link provider
+ */
+
+#include <adt/prodcons.h>
+#include <async.h>
+#include <errno.h>
+#include <inet/iplink_srv.h>
+#include <io/log.h>
+#include <loc.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#define NAME "loopip"
+
+static int loopip_open(iplink_srv_t *srv);
+static int loopip_close(iplink_srv_t *srv);
+static int loopip_send(iplink_srv_t *srv, iplink_srv_sdu_t *sdu);
+static int loopip_get_mtu(iplink_srv_t *srv, size_t *mtu);
+static int loopip_addr_add(iplink_srv_t *srv, iplink_srv_addr_t *addr);
+static int loopip_addr_remove(iplink_srv_t *srv, iplink_srv_addr_t *addr);
+
+static void loopip_client_conn(ipc_callid_t iid, ipc_call_t *icall, void *arg);
+
+static iplink_ops_t loopip_iplink_ops = {
+	.open = loopip_open,
+	.close = loopip_close,
+	.send = loopip_send,
+	.get_mtu = loopip_get_mtu,
+	.addr_add = loopip_addr_add,
+	.addr_remove = loopip_addr_remove
+};
+
+static iplink_srv_t loopip_iplink;
+static prodcons_t loopip_rcv_queue;
+
+typedef struct {
+	link_t link;
+	iplink_srv_sdu_t sdu;
+} rqueue_entry_t;
+
+static int loopip_recv_fibril(void *arg)
+{
+	while (true) {
+		log_msg(LVL_DEBUG, "loopip_recv_fibril(): Wait for one item");
+		link_t *link = prodcons_consume(&loopip_rcv_queue);
+		rqueue_entry_t *rqe = list_get_instance(link, rqueue_entry_t, link);
+
+		(void) iplink_ev_recv(&loopip_iplink, &rqe->sdu);
+	}
+
+	return 0;
+}
+
+static int loopip_init(void)
+{
+	int rc;
+	service_id_t sid;
+	category_id_t iplink_cat;
+	const char *svc_name = "net/loopback";
+
+	async_set_client_connection(loopip_client_conn);
+
+	rc = loc_server_register(NAME);
+	if (rc != EOK) {
+		log_msg(LVL_ERROR, "Failed registering server.");
+		return rc;
+	}
+
+	iplink_srv_init(&loopip_iplink);
+	loopip_iplink.ops = &loopip_iplink_ops;
+	loopip_iplink.arg = NULL;
+
+	prodcons_initialize(&loopip_rcv_queue);
+
+	rc = loc_service_register(svc_name, &sid);
+	if (rc != EOK) {
+		log_msg(LVL_ERROR, "Failed registering service %s.", svc_name);
+		return rc;
+	}
+
+	rc = loc_category_get_id("iplink", &iplink_cat, IPC_FLAG_BLOCKING);
+	if (rc != EOK) {
+		log_msg(LVL_ERROR, "Failed resolving category 'iplink'.");
+		return rc;
+	}
+
+	rc = loc_service_add_to_cat(sid, iplink_cat);
+	if (rc != EOK) {
+		log_msg(LVL_ERROR, "Failed adding %s to category.", svc_name);
+		return rc;
+	}
+
+	fid_t fid = fibril_create(loopip_recv_fibril, NULL);
+	if (fid == 0)
+		return ENOMEM;
+
+	fibril_add_ready(fid);
+
+	return EOK;
+}
+
+static void loopip_client_conn(ipc_callid_t iid, ipc_call_t *icall, void *arg)
+{
+	log_msg(LVL_DEBUG, "loopip_client_conn()");
+	iplink_conn(iid, icall, &loopip_iplink);
+}
+
+static int loopip_open(iplink_srv_t *srv)
+{
+	log_msg(LVL_DEBUG, "loopip_open()");
+	return EOK;
+}
+
+static int loopip_close(iplink_srv_t *srv)
+{
+	log_msg(LVL_DEBUG, "loopip_close()");
+	return EOK;
+}
+
+static int loopip_send(iplink_srv_t *srv, iplink_srv_sdu_t *sdu)
+{
+	rqueue_entry_t *rqe;
+
+	log_msg(LVL_DEBUG, "loopip_send()");
+
+	rqe = calloc(1, sizeof(rqueue_entry_t));
+	if (rqe == NULL)
+		return ENOMEM;
+	/*
+	 * Clone SDU
+	 */
+	rqe->sdu.lsrc = sdu->ldest;
+	rqe->sdu.ldest = sdu->lsrc;
+	rqe->sdu.data = malloc(sdu->size);
+	if (rqe->sdu.data == NULL) {
+		free(rqe);
+		return ENOMEM;
+	}
+
+	memcpy(rqe->sdu.data, sdu->data, sdu->size);
+	rqe->sdu.size = sdu->size;
+
+	/*
+	 * Insert to receive queue
+	 */
+	prodcons_produce(&loopip_rcv_queue, &rqe->link);
+
+	return EOK;
+}
+
+static int loopip_get_mtu(iplink_srv_t *srv, size_t *mtu)
+{
+	log_msg(LVL_DEBUG, "loopip_get_mtu()");
+	*mtu = 1500;
+	return EOK;
+}
+
+static int loopip_addr_add(iplink_srv_t *srv, iplink_srv_addr_t *addr)
+{
+	log_msg(LVL_DEBUG, "loopip_addr_add(0x%" PRIx32 ")", addr->ipv4);
+	return EOK;
+}
+
+static int loopip_addr_remove(iplink_srv_t *srv, iplink_srv_addr_t *addr)
+{
+	log_msg(LVL_DEBUG, "loopip_addr_remove(0x%" PRIx32 ")", addr->ipv4);
+	return EOK;
+}
+
+int main(int argc, char *argv[])
+{
+	int rc;
+
+	printf(NAME ": HelenOS loopback IP link provider\n");
+
+	if (log_init(NAME, LVL_WARN) != EOK) {
+		printf(NAME ": Failed to initialize logging.\n");
+		return 1;
+	}
+
+	rc = loopip_init();
+	if (rc != EOK)
+		return 1;
+
+	printf(NAME ": Accepting connections.\n");
+	task_retval(0);
+	async_manager();
+
+	/* Not reached */
+	return 0;
+}
+
+/** @}
+ */
