networkd-netdev.c revision ee3a6a51e5b098aa0c9641ed71d275c459ad2f5a
/*-*- 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"
#define VLANID_MAX 4094
static const char* const netdev_kind_table[] = {
[NETDEV_KIND_BRIDGE] = "bridge",
[NETDEV_KIND_BOND] = "bond",
[NETDEV_KIND_VLAN] = "vlan",
};
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_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_new_link(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->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, Link *link, sd_rtnl_message_handler_t callback) {
_cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL;
const char *kind;
int r;
assert(netdev);
assert(!(netdev->kind == NETDEV_KIND_VLAN) || (link && callback && netdev->vlanid <= VLANID_MAX));
assert(netdev->name);
assert(netdev->manager);
assert(netdev->manager->rtnl);
r = sd_rtnl_message_new_link(RTM_NEWLINK, 0, &req);
if (r < 0) {
log_error_netdev(netdev,
"Could not allocate RTM_NEWLINK message: %s",
strerror(-r));
return r;
}
if (link) {
r = sd_rtnl_message_append_u32(req, IFLA_LINK, link->ifindex);
if (r < 0) {
log_error_netdev(netdev,
"Could not append IFLA_LINK attribute: %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;
}
if (netdev->vlanid <= VLANID_MAX) {
r = sd_rtnl_message_open_container(req, IFLA_INFO_DATA);
if (r < 0) {
log_error_netdev(netdev,
"Could not open IFLA_INFO_DATA container: %s",
strerror(-r));
return r;
}
r = sd_rtnl_message_append_u16(req, IFLA_VLAN_ID, netdev->vlanid);
if (r < 0) {
log_error_netdev(netdev,
"Could not append IFLA_VLAN_ID attribute: %s",
strerror(-r));
return r;
}
r = sd_rtnl_message_close_container(req);
if (r < 0) {
log_error_netdev(netdev,
"Could not close IFLA_INFO_DATA container %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;
}
if (link)
r = sd_rtnl_call_async(netdev->manager->rtnl, req, callback, link, 0, NULL);
else
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->kind == NETDEV_KIND_VLAN)
return netdev_create(netdev, link, 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_ifindex(NetDev *netdev, int ifindex) {
assert(netdev);
assert(ifindex > 0);
if (netdev->ifindex > 0) {
if (netdev->ifindex == ifindex)
return 0;
else
return -EEXIST;
}
netdev->ifindex = ifindex;
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;
netdev->vlanid = VLANID_MAX + 1;
r = config_parse(NULL, filename, file, "NetDev\0VLAN\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;
}
if (netdev->kind == NETDEV_KIND_VLAN && netdev->vlanid > VLANID_MAX) {
log_warning("VLAN without valid Id 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);
if (netdev->kind != NETDEV_KIND_VLAN) {
r = netdev_create(netdev, NULL, NULL);
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;
}