networkd: netdev - add dummy support

7 files changed, 145 insertions, 4 deletions

diff --git a/Makefile.am b/Makefile.am
index 783f5fe18..092153b56 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -4518,6 +4518,7 @@ libsystemd_networkd_core_la_SOURCES = \
 	src/network/networkd-tunnel.c \
 	src/network/networkd-veth.c \
 	src/network/networkd-vxlan.c \
+	src/network/networkd-dummy.c \
 	src/network/networkd-network.c \
 	src/network/networkd-address.c \
 	src/network/networkd-route.c \
diff --git a/TODO b/TODO
index 9fcbb6977..983479b79 100644
--- a/TODO
+++ b/TODO
@@ -621,7 +621,6 @@ Features:
    - properly handle routerless dhcp leases
    - add veth netdev support (c.f. http://shorewall.net/bridge-Shorewall-perl.html#veth)
    - add tun/tap netdev support
-   - add dummy netdev support
    - add more attribute support for SIT tunnel
    - make metric of routes configurable
    - work with non-ethernet devices
diff --git a/man/systemd.netdev.xml b/man/systemd.netdev.xml
index 48c6e726d..5d033e77d 100644
--- a/man/systemd.netdev.xml
+++ b/man/systemd.netdev.xml
@@ -163,8 +163,8 @@
                                                 <literal>macvlan</literal>, <literal>vxlan</literal>,
                                                 <literal>ipip</literal>, <literal>gre</literal>,
                                                 <literal>sit</literal>, <literal>vti</literal>,
-                                                <literal>veth</literal> are supported. This option
-                                                is compulsory.</para>
+                                                <literal>veth</literal>, and <literal>dummy</literal>
+                                                are supported. This option is compulsory.</para>
                                         </listitem>
                                 </varlistentry>
                                 <varlistentry>
@@ -422,6 +422,14 @@ Kind=veth
 Name=veth-peer</programlisting>
                 </example>
 
+                <example>
+                        <title>/etc/systemd/network/dummy.netdev</title>
+                        <programlisting>[NetDev]
+Name=dummy-test
+Kind=dummy
+MACAddress=12:34:56:78:9a:bc</programlisting>
+                </example>
+
         </refsect1>
         <refsect1>
                 <title>See Also</title>
diff --git a/src/libsystemd/sd-rtnl/rtnl-types.c b/src/libsystemd/sd-rtnl/rtnl-types.c
index d3349b21b..9c3430d1b 100644
--- a/src/libsystemd/sd-rtnl/rtnl-types.c
+++ b/src/libsystemd/sd-rtnl/rtnl-types.c
@@ -160,6 +160,7 @@ typedef enum NLUnionLinkInfoData {
         NL_UNION_LINK_INFO_DATA_BRIDGE,
         NL_UNION_LINK_INFO_DATA_VLAN,
         NL_UNION_LINK_INFO_DATA_VETH,
+        NL_UNION_LINK_INFO_DATA_DUMMY,
         NL_UNION_LINK_INFO_DATA_MACVLAN,
         NL_UNION_LINK_INFO_DATA_VXLAN,
         NL_UNION_LINK_INFO_DATA_IPIP_TUNNEL,
@@ -179,6 +180,7 @@ static const char* const nl_union_link_info_data_table[_NL_UNION_LINK_INFO_DATA_
         [NL_UNION_LINK_INFO_DATA_BRIDGE] = "bridge",
         [NL_UNION_LINK_INFO_DATA_VLAN] = "vlan",
         [NL_UNION_LINK_INFO_DATA_VETH] = "veth",
+        [NL_UNION_LINK_INFO_DATA_DUMMY] = "dummy",
         [NL_UNION_LINK_INFO_DATA_MACVLAN] = "macvlan",
         [NL_UNION_LINK_INFO_DATA_VXLAN] = "vxlan",
         [NL_UNION_LINK_INFO_DATA_IPIP_TUNNEL] = "ipip",
diff --git a/src/network/networkd-dummy.c b/src/network/networkd-dummy.c
new file mode 100644
index 000000000..5232524df
--- /dev/null
+++ b/src/network/networkd-dummy.c
@@ -0,0 +1,120 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+    This file is part of systemd.
+
+    Copyright 2014 Susant Sahani <susant@redhat.com>
+    Copyright 2014 Tom Gundersen
+
+    systemd is free software; you can redistribute it and/or modify it
+    under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation; either version 2.1 of the License, or
+    (at your option) any later version.
+
+    systemd is distributed in the hope that it will be useful, but
+    WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <netinet/ether.h>
+#include <arpa/inet.h>
+#include <net/if.h>
+#include <linux/veth.h>
+
+#include "sd-rtnl.h"
+#include "networkd.h"
+
+
+static int netdev_fill_dummy_rtnl_message(NetDev *netdev, sd_rtnl_message *m) {
+        int r;
+
+        assert(netdev);
+        assert(m);
+
+        r = sd_rtnl_message_append_string(m, IFLA_IFNAME, netdev->ifname);
+        if (r < 0) {
+                log_error_netdev(netdev,
+                                 "Could not append IFLA_IFNAME, attribute: %s",
+                                 strerror(-r));
+                return r;
+        }
+
+        if (netdev->mac) {
+                r = sd_rtnl_message_append_ether_addr(m, IFLA_ADDRESS, netdev->mac);
+                if (r < 0) {
+                        log_error_netdev(netdev,
+                                         "Colud not append IFLA_ADDRESS attribute: %s",
+                                         strerror(-r));
+                    return r;
+                }
+        }
+
+        r = sd_rtnl_message_open_container(m, IFLA_LINKINFO);
+        if (r < 0) {
+                log_error_netdev(netdev,
+                                 "Could not append IFLA_LINKINFO attribute: %s",
+                                 strerror(-r));
+                return r;
+        }
+
+        r = sd_rtnl_message_open_container_union(m, IFLA_INFO_DATA,
+                                                 netdev_kind_to_string(netdev->kind));
+        if (r < 0) {
+                log_error_netdev(netdev,
+                                 "Could not append IFLA_INFO_DATA attribute: %s",
+                                 strerror(-r));
+                return r;
+        }
+
+        r = sd_rtnl_message_close_container(m);
+        if (r < 0) {
+                log_error_netdev(netdev,
+                                 "Could not append IFLA_LINKINFO attribute: %s",
+                                 strerror(-r));
+                return r;
+        }
+
+        return r;
+}
+
+int netdev_create_dummy(NetDev *netdev, sd_rtnl_message_handler_t callback) {
+        _cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;
+        int r;
+
+        assert(netdev);
+        assert(netdev->ifname);
+        assert(netdev->manager);
+        assert(netdev->manager->rtnl);
+
+        r = sd_rtnl_message_new_link(netdev->manager->rtnl, &m, RTM_NEWLINK, 0);
+        if (r < 0) {
+                log_error_netdev(netdev,
+                                 "Could not allocate RTM_NEWLINK message: %s",
+                                 strerror(-r));
+                return r;
+        }
+
+        if(netdev->kind != NETDEV_KIND_DUMMY)
+                return -ENOTSUP;
+
+        r = netdev_fill_dummy_rtnl_message(netdev, m);
+        if(r < 0)
+                return r;
+
+        r = sd_rtnl_call_async(netdev->manager->rtnl, m, callback, netdev, 0, NULL);
+        if (r < 0) {
+                log_error_netdev(netdev,
+                                 "Could not send rtnetlink message: %s", strerror(-r));
+                return r;
+        }
+
+        log_debug_netdev(netdev, "Creating dummy netdev.");
+
+        netdev->state = NETDEV_STATE_CREATING;
+
+        return 0;
+}
diff --git a/src/network/networkd-netdev.c b/src/network/networkd-netdev.c
index 20917e334..2fff962b5 100644
--- a/src/network/networkd-netdev.c
+++ b/src/network/networkd-netdev.c
@@ -41,7 +41,8 @@ static const char* const netdev_kind_table[_NETDEV_KIND_MAX] = {
         [NETDEV_KIND_GRE] = "gre",
         [NETDEV_KIND_SIT] = "sit",
         [NETDEV_KIND_VETH] = "veth",
-        [NETDEV_KIND_VTI] = "vti"
+        [NETDEV_KIND_VTI] = "vti",
+        [NETDEV_KIND_DUMMY] = "dummy",
 };
 
 DEFINE_STRING_TABLE_LOOKUP(netdev_kind, NetDevKind);
@@ -718,6 +719,14 @@ static int netdev_load_one(Manager *manager, const char *filename) {
                         return r;
 
                 break;
+        case NETDEV_KIND_DUMMY:
+                r = netdev_create_dummy(netdev, netdev_create_handler);
+                if (r < 0)
+                        return r;
+
+                netdev_ref(netdev);
+
+                break;
         case NETDEV_KIND_BRIDGE:
         case NETDEV_KIND_BOND:
                 r = netdev_create(netdev, NULL, NULL);
diff --git a/src/network/networkd.h b/src/network/networkd.h
index c2b88acd6..e0232af1e 100644
--- a/src/network/networkd.h
+++ b/src/network/networkd.h
@@ -81,6 +81,7 @@ typedef enum NetDevKind {
         NETDEV_KIND_SIT,
         NETDEV_KIND_VETH,
         NETDEV_KIND_VTI,
+        NETDEV_KIND_DUMMY,
         _NETDEV_KIND_MAX,
         _NETDEV_KIND_INVALID = -1
 } NetDevKind;
@@ -353,6 +354,7 @@ int netdev_enslave(NetDev *netdev, Link *link, sd_rtnl_message_handler_t cb);
 int netdev_create_tunnel(NetDev *netdev, Link *link, sd_rtnl_message_handler_t callback);
 int netdev_create_veth(NetDev *netdev, sd_rtnl_message_handler_t callback);
 int netdev_create_vxlan(NetDev *netdev, Link *link, sd_rtnl_message_handler_t callback);
+int netdev_create_dummy(NetDev *netdev, sd_rtnl_message_handler_t callback);
 
 const char *netdev_kind_to_string(NetDevKind d) _const_;
 NetDevKind netdev_kind_from_string(const char *d) _pure_;