networkd: add basic bonding support

Refactor bridging support to be generic netdev support and extend it to
cover bonding as well.

1 files changed, 354 insertions, 0 deletions

diff --git a/src/network/networkd-netdev.c b/src/network/networkd-netdev.c
new file mode 100644
index 0000000000..2d1cef112b
--- /dev/null
+++ b/src/network/networkd-netdev.c
@@ -0,0 +1,354 @@
+/*-*- 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 "networkd.h"
+#include "net-util.h"
+#include "path-util.h"
+#include "conf-files.h"
+#include "conf-parser.h"
+#include "list.h"
+
+static const char* const netdev_kind_table[] = {
+        [NETDEV_KIND_BRIDGE] = "bridge",
+        [NETDEV_KIND_BOND] = "bond"
+};
+
+DEFINE_STRING_TABLE_LOOKUP(netdev_kind, NetdevKind);
+DEFINE_CONFIG_PARSE_ENUM(config_parse_netdev_kind, netdev_kind, NetdevKind, "Failed to parse netdev kind");
+
+void netdev_free(Netdev *netdev) {
+        netdev_enslave_callback *callback;
+
+        if (!netdev)
+                return;
+
+        while ((callback = netdev->callbacks)) {
+                LIST_REMOVE(callbacks, netdev->callbacks, callback);
+                free(callback);
+        }
+
+        if (netdev->name)
+                hashmap_remove(netdev->manager->netdevs, netdev->name);
+
+        free(netdev->filename);
+
+        free(netdev->description);
+        free(netdev->name);
+
+        free(netdev);
+}
+
+int netdev_get(Manager *manager, const char *name, Netdev **ret) {
+        Netdev *netdev;
+
+        assert(manager);
+        assert(name);
+        assert(ret);
+
+        netdev = hashmap_get(manager->netdevs, name);
+        if (!netdev) {
+                *ret = NULL;
+                return -ENOENT;
+        }
+
+        *ret = netdev;
+
+        return 0;
+}
+
+static int netdev_enter_failed(Netdev *netdev) {
+        netdev->state = NETDEV_STATE_FAILED;
+
+        return 0;
+}
+
+static int netdev_enslave_ready(Netdev *netdev, Link* link, sd_rtnl_message_handler_t callback) {
+        _cleanup_sd_rtnl_message_unref_ sd_rtnl_message *req = NULL;
+        int r;
+
+        assert(netdev);
+        assert(netdev->state == NETDEV_STATE_READY);
+        assert(link);
+        assert(callback);
+
+        r = sd_rtnl_message_link_new(RTM_SETLINK, link->ifindex, &req);
+        if (r < 0) {
+                log_error_netdev(netdev,
+                                 "Could not allocate RTM_SETLINK message: %s",
+                                 strerror(-r));
+                return r;
+        }
+
+        r = sd_rtnl_message_append_u32(req, IFLA_MASTER, netdev->link->ifindex);
+        if (r < 0) {
+                log_error_netdev(netdev,
+                                 "Could not append IFLA_MASTER attribute: %s",
+                                 strerror(-r));
+                return r;
+        }
+
+        r = sd_rtnl_call_async(netdev->manager->rtnl, req, 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, "enslaving link '%s'", link->ifname);
+
+        return 0;
+}
+
+static int netdev_enter_ready(Netdev *netdev) {
+        netdev_enslave_callback *callback;
+
+        assert(netdev);
+        assert(netdev->name);
+
+        netdev->state = NETDEV_STATE_READY;
+
+        log_info_netdev(netdev, "netdev ready");
+
+        LIST_FOREACH(callbacks, callback, netdev->callbacks) {
+                /* enslave the links that were attempted to be enslaved befor the
+                 * link was ready */
+                netdev_enslave_ready(netdev, callback->link, callback->callback);
+        }
+
+        return 0;
+}
+
+static int netdev_create_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
+        Netdev *netdev = userdata;
+        int r;
+
+        assert(netdev->state != _NETDEV_STATE_INVALID);
+
+        r = sd_rtnl_message_get_errno(m);
+        if (r < 0) {
+                log_warning_netdev(netdev, "netdev failed: %s", strerror(-r));
+                netdev_enter_failed(netdev);
+
+                return 1;
+        }
+
+        return 1;
+}
+
+static int netdev_create(Netdev *netdev) {
+        _cleanup_sd_rtnl_message_unref_ sd_rtnl_message *req = NULL;
+        const char *kind;
+        int r;
+
+        assert(netdev);
+        assert(netdev->state == _NETDEV_STATE_INVALID);
+        assert(netdev->name);
+        assert(netdev->manager);
+        assert(netdev->manager->rtnl);
+
+        r = sd_rtnl_message_link_new(RTM_NEWLINK, 0, &req);
+        if (r < 0) {
+                log_error_netdev(netdev,
+                                 "Could not allocate RTM_NEWLINK message: %s",
+                                 strerror(-r));
+                return r;
+        }
+
+        r = sd_rtnl_message_append_string(req, IFLA_IFNAME, netdev->name);
+        if (r < 0) {
+                log_error_netdev(netdev,
+                                 "Could not append IFLA_IFNAME attribute: %s",
+                                 strerror(-r));
+                return r;
+        }
+
+        r = sd_rtnl_message_open_container(req, IFLA_LINKINFO);
+        if (r < 0) {
+                log_error_netdev(netdev,
+                                 "Could not open IFLA_LINKINFO container: %s",
+                                 strerror(-r));
+                return r;
+        }
+
+        kind = netdev_kind_to_string(netdev->kind);
+        if (!kind) {
+                log_error_netdev(netdev, "Invalid kind");
+                return -EINVAL;
+        }
+
+        r = sd_rtnl_message_append_string(req, IFLA_INFO_KIND, kind);
+        if (r < 0) {
+                log_error_netdev(netdev,
+                                 "Could not append IFLA_INFO_KIND attribute: %s",
+                                 strerror(-r));
+                return r;
+        }
+
+        r = sd_rtnl_message_close_container(req);
+        if (r < 0) {
+                log_error_netdev(netdev,
+                                 "Could not close IFLA_LINKINFO container %s",
+                                 strerror(-r));
+                return r;
+        }
+
+        r = sd_rtnl_call_async(netdev->manager->rtnl, req, &netdev_create_handler, 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 netdev");
+
+        netdev->state = NETDEV_STATE_CREATING;
+
+        return 0;
+}
+
+int netdev_enslave(Netdev *netdev, Link *link, sd_rtnl_message_handler_t callback) {
+        if (netdev->state == NETDEV_STATE_READY) {
+                netdev_enslave_ready(netdev, link, callback);
+        } else {
+                /* the netdev is not yet read, save this request for when it is*/
+                netdev_enslave_callback *cb;
+
+                cb = new0(netdev_enslave_callback, 1);
+                if (!cb)
+                        return log_oom();
+
+                cb->callback = callback;
+                cb->link = link;
+
+                LIST_PREPEND(callbacks, netdev->callbacks, cb);
+        }
+
+        return 0;
+}
+
+int netdev_set_link(Manager *m, NetdevKind kind, Link *link) {
+        Netdev *netdev;
+        int r;
+
+        r = netdev_get(m, link->ifname, &netdev);
+        if (r < 0)
+                return r;
+
+        if (netdev->link && netdev->link != link)
+                return -EEXIST;
+
+        if (netdev->kind != kind)
+                return -EINVAL;
+
+        netdev->link = link;
+
+        netdev_enter_ready(netdev);
+
+        return 0;
+}
+
+static int netdev_load_one(Manager *manager, const char *filename) {
+        _cleanup_netdev_free_ Netdev *netdev = NULL;
+        _cleanup_fclose_ FILE *file = NULL;
+        int r;
+
+        assert(manager);
+        assert(filename);
+
+        file = fopen(filename, "re");
+        if (!file) {
+                if (errno == ENOENT)
+                        return 0;
+                else
+                        return errno;
+        }
+
+        netdev = new0(Netdev, 1);
+        if (!netdev)
+                return log_oom();
+
+        netdev->manager = manager;
+        netdev->state = _NETDEV_STATE_INVALID;
+        netdev->kind = _NETDEV_KIND_INVALID;
+
+        r = config_parse(NULL, filename, file, "Netdev\0", config_item_perf_lookup,
+                        (void*) network_gperf_lookup, false, false, netdev);
+        if (r < 0) {
+                log_warning("Could not parse config file %s: %s", filename, strerror(-r));
+                return r;
+        }
+
+        if (netdev->kind == _NETDEV_KIND_INVALID) {
+                log_warning("Netdev without Kind configured in %s. Ignoring", filename);
+                return 0;
+        }
+
+        if (!netdev->name) {
+                log_warning("Netdev without Name configured in %s. Ignoring", filename);
+                return 0;
+        }
+
+        netdev->filename = strdup(filename);
+        if (!netdev->filename)
+                return log_oom();
+
+        r = hashmap_put(netdev->manager->netdevs, netdev->name, netdev);
+        if (r < 0)
+                return r;
+
+        LIST_HEAD_INIT(netdev->callbacks);
+
+        r = netdev_create(netdev);
+        if (r < 0)
+                return r;
+
+        netdev = NULL;
+
+        return 0;
+}
+
+int netdev_load(Manager *manager) {
+        Netdev *netdev;
+        char **files, **f;
+        int r;
+
+        assert(manager);
+
+        while ((netdev = hashmap_first(manager->netdevs)))
+                netdev_free(netdev);
+
+        r = conf_files_list_strv(&files, ".netdev", NULL, network_dirs);
+        if (r < 0) {
+                log_error("Failed to enumerate netdev files: %s", strerror(-r));
+                return r;
+        }
+
+        STRV_FOREACH_BACKWARDS(f, files) {
+                r = netdev_load_one(manager, *f);
+                if (r < 0)
+                        return r;
+        }
+
+        strv_free(files);
+
+        return 0;
+}