networkd: add a basic network daemon

This daemon listens for and configures network devices tagged with
'systemd-networkd'. By default, no devices are tagged so this daemon
can safely run in parallel with existing network daemons/scripts.

Networks are configured in /etc/systemd/network/*.network. The first .network
file that matches a given link is applied. The matching logic is similar to
the one for .link files, but additionally supports matching on interface name.

The mid-term aim is to provide an alternative to ad-hoc scripts currently used
in initrd's and for wired setups that don't change much (e.g., as seen on
servers/and some embedded systems).

Currently, static addresses and a gateway can be configured.

Example .network file:

[Match]
Name=wlp2s0

[Network]
Description=My Network
Gateway=192.168.1.1
Address=192.168.1.23/24
Address=fe80::9aee:94ff:fe3f:c618/64

1 files changed, 129 insertions, 0 deletions

diff --git a/src/network/networkd-route.c b/src/network/networkd-route.c
new file mode 100644
index 0000000000..918a1d0191
--- /dev/null
+++ b/src/network/networkd-route.c
@@ -0,0 +1,129 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2013 Tom Gundersen <teg@jklm.no>
+
+  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 <net/if.h>
+
+#include "networkd.h"
+
+#include "utf8.h"
+#include "util.h"
+#include "conf-parser.h"
+#include "net-util.h"
+
+int route_new(Network *network, Route **ret) {
+        _cleanup_route_free_ Route *route = NULL;
+
+        route = new0(Route, 1);
+        if (!route)
+                return -ENOMEM;
+
+        route->network = network;
+
+        LIST_PREPEND(routes, network->routes, route);
+
+        *ret = route;
+        route = NULL;
+
+        return 0;
+}
+
+void route_free(Route *route) {
+        if (!route)
+                return;
+
+        LIST_REMOVE(routes, route->network->routes, route);
+
+        free(route);
+}
+
+int route_configure(Manager *manager, Route *route, Link *link) {
+        _cleanup_sd_rtnl_message_unref_ sd_rtnl_message *req = NULL;
+        int r;
+
+        assert(manager);
+        assert(link);
+        assert(link->ifindex > 0);
+        assert(route->family == AF_INET || route->family == AF_INET6);
+
+        r = sd_rtnl_message_route_new(RTM_NEWROUTE, route->family, 0, 0, 0,
+                                      RT_TABLE_MAIN, RT_SCOPE_UNIVERSE, RTPROT_BOOT,
+                                      RTN_UNICAST, 0, &req);
+        if (r < 0) {
+                log_error("Could not create RTM_NEWROUTE message: %s", strerror(-r));
+                return r;
+        }
+
+        r = sd_rtnl_message_append(req, RTA_GATEWAY, &route->in_addr);
+        if (r < 0) {
+                log_error("Could not append RTA_GATEWAY attribute: %s", strerror(-r));
+                return r;
+        }
+
+        r = sd_rtnl_message_append(req, RTA_OIF, &link->ifindex);
+        if (r < 0) {
+                log_error("Could not append RTA_OIF attribute: %s", strerror(-r));
+                return r;
+        }
+
+        r = sd_rtnl_send_with_reply_and_block(manager->rtnl, req, 0, NULL);
+        if (r < 0) {
+                log_error("Could not configure route: %s", strerror(-r));
+                return r;
+        }
+
+        log_info("Configured route");
+
+        return 0;
+}
+
+int config_parse_gateway(const char *unit,
+                const char *filename,
+                unsigned line,
+                const char *section,
+                const char *lvalue,
+                int ltype,
+                const char *rvalue,
+                void *data,
+                void *userdata) {
+        _cleanup_route_free_ Route *n = NULL;
+        _cleanup_free_ char *route = NULL;
+        int r;
+
+        assert(filename);
+        assert(lvalue);
+        assert(rvalue);
+        assert(data);
+
+        r = route_new(userdata, &n);
+        if (r < 0)
+                return r;
+
+        r = net_parse_inaddr(rvalue, &n->family, &n->in_addr);
+        if (r < 0) {
+                log_syntax(unit, LOG_ERR, filename, line, EINVAL,
+                           "Route is invalid, ignoring assignment: %s", route);
+                return 0;
+        }
+
+        n = NULL;
+
+        return 0;
+}