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, 170 insertions, 0 deletions

diff --git a/src/network/networkd.h b/src/network/networkd.h
new file mode 100644
index 0000000000..fd3b60a6cb
--- /dev/null
+++ b/src/network/networkd.h
@@ -0,0 +1,170 @@
+/*-*- 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/>.
+***/
+
+#pragma once
+
+#include <arpa/inet.h>
+#include <linux/rtnetlink.h>
+
+#include "sd-event.h"
+#include "sd-rtnl.h"
+#include "udev.h"
+
+#include "rtnl-util.h"
+#include "hashmap.h"
+#include "list.h"
+
+typedef struct Network Network;
+typedef struct Link Link;
+typedef struct Address Address;
+typedef struct Route Route;
+typedef struct Manager Manager;
+
+struct Network {
+        Manager *manager;
+
+        char *filename;
+
+        struct ether_addr *match_mac;
+        char *match_path;
+        char *match_driver;
+        char *match_type;
+        char *match_name;
+
+        char *description;
+
+        LIST_HEAD(Address, addresses);
+        LIST_HEAD(Route, routes);
+
+        LIST_FIELDS(Network, networks);
+};
+
+struct Address {
+        Network *network;
+
+        unsigned char family;
+        unsigned char prefixlen;
+        char *label;
+
+        union {
+                struct in_addr in;
+                struct in6_addr in6;
+        } in_addr;
+
+        LIST_FIELDS(Address, addresses);
+};
+
+struct Route {
+        Network *network;
+
+        unsigned char family;
+
+        union {
+                struct in_addr in;
+                struct in6_addr in6;
+        } in_addr;
+
+        LIST_FIELDS(Route, routes);
+};
+
+struct Link {
+        Manager *manager;
+
+        int ifindex;
+
+        unsigned flags;
+
+        Network *network;
+};
+
+struct Manager {
+        sd_rtnl *rtnl;
+        sd_event *event;
+        struct udev *udev;
+        struct udev_monitor *udev_monitor;
+        sd_event_source *udev_event_source;
+
+        Hashmap *links;
+        LIST_HEAD(Network, networks);
+
+        char **network_dirs;
+        usec_t network_dirs_ts_usec;
+};
+
+/* Manager */
+
+int manager_new(Manager **ret);
+void manager_free(Manager *m);
+
+int manager_udev_enumerate_links(Manager *m);
+int manager_udev_listen(Manager *m);
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(Manager*, manager_free);
+#define _cleanup_manager_free_ _cleanup_(manager_freep)
+
+/* Network */
+
+int network_load(Manager *manager);
+bool network_should_reload(Manager *manager);
+
+void network_free(Network *network);
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(Network*, network_free);
+#define _cleanup_network_free_ _cleanup_(network_freep)
+
+int network_get(Manager *manager, struct udev_device *device, Network **ret);
+int network_apply(Manager *manager, Network *network, Link *link);
+
+const struct ConfigPerfItem* network_gperf_lookup(const char *key, unsigned length);
+
+/* Route */
+int route_new(Network *network, Route **ret);
+void route_free(Route *route);
+int route_configure(Manager *manager, Route *route, Link *link);
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(Route*, route_free);
+#define _cleanup_route_free_ _cleanup_(route_freep)
+
+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);
+
+/* Address */
+int address_new(Network *network, Address **ret);
+void address_free(Address *address);
+int address_configure(Manager *manager, Address *address, Link *link);
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(Address*, address_free);
+#define _cleanup_address_free_ _cleanup_(address_freep)
+
+int config_parse_address(const char *unit, const char *filename, unsigned line,
+                         const char *section, const char *lvalue, int ltype,
+                         const char *rvalue, void *data, void *userdata);
+
+/* Link */
+
+int link_new(Manager *manager, struct udev_device *device, Link **ret);
+void link_free(Link *link);
+int link_add(Manager *manager, struct udev_device *device);
+int link_up(Manager *manager, Link *link);
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(Link*, link_free);
+#define _cleanup_link_free_ _cleanup_(link_freep)