networkd: introduce vxlan

This patch enables netwokd to create vxlan

Changes:
Added:
	1. File networkd networkd-vxlan.c
	2. to netdev
	    bool learning
	    struct in_addr group
	    uint64_t vxlanid;
	3. VXLAN subsection and config
	   parameters

1 files changed, 162 insertions, 0 deletions

diff --git a/src/network/networkd-vxlan.c b/src/network/networkd-vxlan.c
new file mode 100644
index 0000000000..d6721222f2
--- /dev/null
+++ b/src/network/networkd-vxlan.c
@@ -0,0 +1,162 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+    This file is part of systemd.
+
+    Copyright 2014 Susant Sahani <susant@redhat.com>
+
+    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 "sd-rtnl.h"
+#include "networkd.h"
+
+
+static int netdev_fill_vxlan_rtnl_message(NetDev *netdev, Link *link, sd_rtnl_message *m) {
+        int r;
+
+        assert(link);
+        assert(link->network);
+        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;
+        }
+
+        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;
+        }
+
+        if (netdev->vlanid <= VXLAN_VID_MAX) {
+                r = sd_rtnl_message_append_u32(m, IFLA_VXLAN_ID, netdev->vxlanid);
+                if (r < 0) {
+                        log_error_netdev(netdev,
+                                         "Could not append IFLA_VXLAN_ID attribute: %s",
+                                         strerror(-r));
+                        return r;
+                }
+        }
+
+        r = sd_rtnl_message_append_in_addr(m, IFLA_VXLAN_GROUP, &netdev->group);
+        if (r < 0) {
+                log_error_netdev(netdev,
+                                 "Could not append IFLA_VXLAN_GROUP attribute: %s",
+                                 strerror(-r));
+                return r;
+        }
+
+        r = sd_rtnl_message_append_u32(m, IFLA_VXLAN_LINK, link->ifindex);
+        if (r < 0) {
+                log_error_netdev(netdev,
+                                 "Could not append IFLA_VXLAN_LINK attribute: %s",
+                                 strerror(-r));
+                return r;
+        }
+
+        if(netdev->ttl) {
+                r = sd_rtnl_message_append_u8(m, IFLA_VXLAN_TTL, netdev->ttl);
+                if (r < 0) {
+                        log_error_netdev(netdev,
+                                         "Could not append IFLA_VXLAN_TTL attribute: %s",
+                                         strerror(-r));
+                        return r;
+                }
+        }
+
+        if(netdev->tos) {
+                r = sd_rtnl_message_append_u8(m, IFLA_VXLAN_TOS, netdev->tos);
+                if (r < 0) {
+                        log_error_netdev(netdev,
+                                         "Could not append IFLA_VXLAN_TOS attribute: %s",
+                                         strerror(-r));
+                        return r;
+                }
+        }
+
+        r = sd_rtnl_message_append_u8(m, IFLA_VXLAN_LEARNING, netdev->learning);
+        if (r < 0) {
+                log_error_netdev(netdev,
+                                 "Could not append IFLA_VXLAN_LEARNING 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_vxlan(NetDev *netdev, Link *link, sd_rtnl_message_handler_t callback) {
+        _cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;
+        int r;
+
+        assert(netdev);
+        assert(!(netdev->kind == NETDEV_KIND_VXLAN) || (link && callback));
+        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;
+        }
+
+        r = netdev_fill_vxlan_rtnl_message(netdev, link, m);
+        if(r < 0)
+                return r;
+
+        r = sd_rtnl_call_async(netdev->manager->rtnl, m, callback, link, 0, NULL);
+        if (r < 0) {
+                log_error_netdev(netdev,
+                                 "Could not send rtnetlink message: %s", strerror(-r));
+                return r;
+        }
+
+        log_debug_netdev(netdev, "Creating vxlan netdev: %s",
+                         netdev_kind_to_string(netdev->kind));
+
+        netdev->state = NETDEV_STATE_CREATING;
+
+        return 0;
+}