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Systemd/src/network/networkd-link.c
Lennart Poettering 151b9b9662 api: in constructor function calls, always put the returned object pointer first (or second) 
Previously the returned object of constructor functions where sometimes
returned as last, sometimes as first and sometimes as second parameter.
Let's clean this up a bit. Here are the new rules:

1. The object the new object is derived from is put first, if there is any

2. The object we are creating will be returned in the next arguments

3. This is followed by any additional arguments

Rationale:

For functions that operate on an object we always put that object first.
Constructors should probably not be too different in this regard. Also,
if the additional parameters might want to use varargs which suggests to
put them last.

Note that this new scheme only applies to constructor functions, not to
all other functions. We do give a lot of freedom for those.

Note that this commit only changes the order of the new functions we
added, for old ones we accept the wrong order and leave it like that.
2014-02-20 00:03:10 +01:00

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/*-*- 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 <netinet/ether.h>
#include <linux/if.h>
#include "networkd.h"
#include "libudev-private.h"
#include "util.h"
#include "bus-util.h"
#include "net-util.h"
int link_new(Manager *manager, struct udev_device *device, Link **ret) {
_cleanup_link_free_ Link *link = NULL;
const char *mac;
struct ether_addr *mac_addr;
const char *ifname;
int r;
assert(device);
assert(ret);
link = new0(Link, 1);
if (!link)
return -ENOMEM;
link->manager = manager;
link->state = _LINK_STATE_INVALID;
link->ifindex = udev_device_get_ifindex(device);
if (link->ifindex <= 0)
return -EINVAL;
mac = udev_device_get_sysattr_value(device, "address");
if (mac) {
mac_addr = ether_aton(mac);
if (mac_addr)
memcpy(&link->mac, mac_addr, sizeof(struct ether_addr));
}
ifname = udev_device_get_sysname(device);
link->ifname = strdup(ifname);
r = hashmap_put(manager->links, &link->ifindex, link);
if (r < 0)
return r;
*ret = link;
link = NULL;
return 0;
}
void link_free(Link *link) {
if (!link)
return;
assert(link->manager);
sd_dhcp_client_free(link->dhcp_client);
sd_dhcp_lease_unref(link->dhcp_lease);
hashmap_remove(link->manager->links, &link->ifindex);
free(link->ifname);
free(link);
}
int link_get(Manager *m, int ifindex, Link **ret) {
Link *link;
uint64_t ifindex_64;
assert(m);
assert(m->links);
assert(ifindex);
assert(ret);
ifindex_64 = ifindex;
link = hashmap_get(m->links, &ifindex_64);
if (!link)
return -ENODEV;
*ret = link;
return 0;
}
int link_add(Manager *m, struct udev_device *device, Link **ret) {
Link *link = NULL;
Network *network;
int r;
assert(m);
assert(device);
r = link_new(m, device, &link);
if (r < 0)
return r;
*ret = link;
r = network_get(m, device, &network);
if (r < 0)
return r == -ENOENT ? 0 : r;
r = network_apply(m, network, link);
if (r < 0)
return r;
return 0;
}
static int link_enter_configured(Link *link) {
assert(link);
assert(link->state == LINK_STATE_SETTING_ROUTES);
log_info_link(link, "link configured");
link->state = LINK_STATE_CONFIGURED;
return 0;
}
static void link_enter_failed(Link *link) {
assert(link);
log_warning_link(link, "failed");
link->state = LINK_STATE_FAILED;
}
static int route_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
Link *link = userdata;
int r;
assert(link->route_messages > 0);
assert(link->state == LINK_STATE_SETTING_ADDRESSES ||
link->state == LINK_STATE_SETTING_ROUTES ||
link->state == LINK_STATE_FAILED);
link->route_messages --;
if (link->state == LINK_STATE_FAILED)
return 1;
r = sd_rtnl_message_get_errno(m);
if (r < 0 && r != -EEXIST)
log_struct_link(LOG_WARNING, link,
"MESSAGE=%s: could not set route: %s",
link->ifname, strerror(-r),
"ERRNO=%d", -r,
NULL);
/* we might have received an old reply after moving back to SETTING_ADDRESSES,
* ignore it */
if (link->route_messages == 0 && link->state == LINK_STATE_SETTING_ROUTES) {
log_debug_link(link, "routes set");
link_enter_configured(link);
}
return 1;
}
static int link_enter_set_routes(Link *link) {
Route *rt;
int r;
assert(link);
assert(link->network);
assert(link->state == LINK_STATE_SETTING_ADDRESSES);
link->state = LINK_STATE_SETTING_ROUTES;
if (!link->network->static_routes && !link->dhcp_lease)
return link_enter_configured(link);
log_debug_link(link, "setting routes");
LIST_FOREACH(static_routes, rt, link->network->static_routes) {
r = route_configure(rt, link, &route_handler);
if (r < 0) {
log_warning_link(link,
"could not set routes: %s", strerror(-r));
link_enter_failed(link);
return r;
}
link->route_messages ++;
}
if (link->dhcp_lease) {
_cleanup_route_free_ Route *route = NULL;
struct in_addr gateway;
r = sd_dhcp_lease_get_router(link->dhcp_lease, &gateway);
if (r < 0) {
log_warning_link(link, "DHCP error: no router: %s",
strerror(-r));
return r;
}
r = route_new_dynamic(&route);
if (r < 0) {
log_error_link(link, "Could not allocate route: %s",
strerror(-r));
return r;
}
route->family = AF_INET;
route->in_addr.in = gateway;
r = route_configure(route, link, &route_handler);
if (r < 0) {
log_warning_link(link,
"could not set routes: %s", strerror(-r));
link_enter_failed(link);
return r;
}
link->route_messages ++;
}
return 0;
}
static int address_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
Link *link = userdata;
int r;
assert(m);
assert(link);
assert(link->ifname);
assert(link->addr_messages > 0);
assert(link->state == LINK_STATE_SETTING_ADDRESSES || link->state == LINK_STATE_FAILED);
link->addr_messages --;
if (link->state == LINK_STATE_FAILED)
return 1;
r = sd_rtnl_message_get_errno(m);
if (r < 0 && r != -EEXIST)
log_struct_link(LOG_WARNING, link,
"MESSAGE=%s: could not set address: %s",
link->ifname, strerror(-r),
"ERRNO=%d", -r,
NULL);
if (link->addr_messages == 0) {
log_debug_link(link, "addresses set");
link_enter_set_routes(link);
}
return 1;
}
static int link_enter_set_addresses(Link *link) {
Address *ad;
int r;
assert(link);
assert(link->network);
assert(link->state != _LINK_STATE_INVALID);
link->state = LINK_STATE_SETTING_ADDRESSES;
if (!link->network->static_addresses && !link->dhcp_lease)
return link_enter_set_routes(link);
log_debug_link(link, "setting addresses");
LIST_FOREACH(static_addresses, ad, link->network->static_addresses) {
r = address_configure(ad, link, &address_handler);
if (r < 0) {
log_warning_link(link,
"could not set addresses: %s", strerror(-r));
link_enter_failed(link);
return r;
}
link->addr_messages ++;
}
if (link->dhcp_lease) {
_cleanup_address_free_ Address *address = NULL;
struct in_addr addr;
struct in_addr netmask;
unsigned prefixlen;
r = sd_dhcp_lease_get_address(link->dhcp_lease, &addr);
if (r < 0) {
log_warning_link(link, "DHCP error: no address: %s",
strerror(-r));
return r;
}
r = sd_dhcp_lease_get_netmask(link->dhcp_lease, &netmask);
if (r < 0) {
log_warning_link(link, "DHCP error: no netmask: %s",
strerror(-r));
return r;
}
prefixlen = net_netmask_to_prefixlen(&netmask);
r = address_new_dynamic(&address);
if (r < 0) {
log_error_link(link, "Could not allocate address: %s",
strerror(-r));
return r;
}
address->family = AF_INET;
address->in_addr.in = addr;
address->prefixlen = prefixlen;
address->broadcast.s_addr = addr.s_addr | ~netmask.s_addr;
r = address_configure(address, link, &address_handler);
if (r < 0) {
log_warning_link(link,
"could not set addresses: %s", strerror(-r));
link_enter_failed(link);
return r;
}
link->addr_messages ++;
}
return 0;
}
static int address_drop_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
Link *link = userdata;
int r;
assert(m);
assert(link);
assert(link->ifname);
if (link->state == LINK_STATE_FAILED)
return 1;
r = sd_rtnl_message_get_errno(m);
if (r < 0 && r != -ENOENT)
log_struct_link(LOG_WARNING, link,
"MESSAGE=%s: could not drop address: %s",
link->ifname, strerror(-r),
"ERRNO=%d", -r,
NULL);
return 1;
}
static int set_hostname_handler(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
int r;
r = sd_bus_message_get_errno(m);
if (r < 0)
log_warning("Could not set hostname: %s", strerror(-r));
return 1;
}
static int set_hostname(sd_bus *bus, const char *hostname) {
_cleanup_bus_message_unref_ sd_bus_message *m = NULL;
int r = 0;
assert(hostname);
log_debug("Setting transient hostname: '%s'", hostname);
if (!bus) { /* TODO: replace by assert when we can rely on kdbus */
log_info("Not connected to system bus, ignoring transient hostname.");
return 0;
}
r = sd_bus_message_new_method_call(
bus,
&m,
"org.freedesktop.hostname1",
"/org/freedesktop/hostname1",
"org.freedesktop.hostname1",
"SetHostname");
if (r < 0)
return r;
r = sd_bus_message_append(m, "sb", hostname, false);
if (r < 0)
return r;
r = sd_bus_call_async(bus, m, set_hostname_handler, NULL, 0, NULL);
if (r < 0)
log_error("Could not set transient hostname: %s", strerror(-r));
return r;
}
static int set_mtu_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
Link *link = userdata;
int r;
assert(m);
assert(link);
assert(link->ifname);
if (link->state == LINK_STATE_FAILED)
return 1;
r = sd_rtnl_message_get_errno(m);
if (r < 0)
log_struct_link(LOG_WARNING, link,
"MESSAGE=%s: could not set MTU: %s",
link->ifname, strerror(-r),
"ERRNO=%d", -r,
NULL);
return 1;
}
static int link_set_mtu(Link *link, uint32_t mtu) {
_cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL;
int r;
assert(link);
assert(link->manager);
assert(link->manager->rtnl);
log_debug_link(link, "setting MTU: %" PRIu32, mtu);
r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
RTM_SETLINK, link->ifindex);
if (r < 0) {
log_error_link(link, "Could not allocate RTM_SETLINK message");
return r;
}
r = sd_rtnl_message_append_u32(req, IFLA_MTU, mtu);
if (r < 0) {
log_error_link(link, "Could not append MTU: %s", strerror(-r));
return r;
}
r = sd_rtnl_call_async(link->manager->rtnl, req, set_mtu_handler, link, 0, NULL);
if (r < 0) {
log_error_link(link,
"Could not send rtnetlink message: %s", strerror(-r));
return r;
}
return 0;
}
static int dhcp_lease_lost(Link *link) {
_cleanup_address_free_ Address *address = NULL;
struct in_addr addr;
struct in_addr netmask;
unsigned prefixlen;
int r;
assert(link);
assert(link->dhcp_lease);
log_warning_link(link, "DHCP lease lost");
r = address_new_dynamic(&address);
if (r >= 0) {
sd_dhcp_lease_get_address(link->dhcp_lease, &addr);
sd_dhcp_lease_get_netmask(link->dhcp_lease, &netmask);
prefixlen = net_netmask_to_prefixlen(&netmask);
address->family = AF_INET;
address->in_addr.in = addr;
address->prefixlen = prefixlen;
address_drop(address, link, address_drop_handler);
}
if (link->network->dhcp_mtu) {
uint16_t mtu;
r = sd_dhcp_lease_get_mtu(link->dhcp_lease, &mtu);
if (r >= 0 && link->original_mtu != mtu) {
r = link_set_mtu(link, link->original_mtu);
if (r < 0) {
log_warning_link(link, "DHCP error: could not reset MTU");
link_enter_failed(link);
return r;
}
}
}
if (link->network->dhcp_hostname) {
const char *hostname = NULL;
r = sd_dhcp_lease_get_hostname(link->dhcp_lease, &hostname);
if (r >= 0 && hostname) {
r = set_hostname(link->manager->bus, "");
if (r < 0)
log_error("Failed to reset transient hostname");
}
}
link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease);
return 0;
}
static int dhcp_lease_acquired(sd_dhcp_client *client, Link *link) {
sd_dhcp_lease *lease;
struct in_addr address;
struct in_addr netmask;
struct in_addr gateway;
unsigned prefixlen;
struct in_addr *nameservers;
size_t nameservers_size;
int r;
assert(client);
assert(link);
r = sd_dhcp_client_get_lease(client, &lease);
if (r < 0) {
log_warning_link(link, "DHCP error: no lease: %s",
strerror(-r));
return r;
}
r = sd_dhcp_lease_get_address(lease, &address);
if (r < 0) {
log_warning_link(link, "DHCP error: no address: %s",
strerror(-r));
return r;
}
r = sd_dhcp_lease_get_netmask(lease, &netmask);
if (r < 0) {
log_warning_link(link, "DHCP error: no netmask: %s",
strerror(-r));
return r;
}
prefixlen = net_netmask_to_prefixlen(&netmask);
r = sd_dhcp_lease_get_router(lease, &gateway);
if (r < 0) {
log_warning_link(link, "DHCP error: no router: %s",
strerror(-r));
return r;
}
log_struct_link(LOG_INFO, link,
"MESSAGE=%s: DHCPv4 address %u.%u.%u.%u/%u via %u.%u.%u.%u",
link->ifname,
ADDRESS_FMT_VAL(address),
prefixlen,
ADDRESS_FMT_VAL(gateway),
"ADDRESS=%u.%u.%u.%u",
ADDRESS_FMT_VAL(address),
"PREFIXLEN=%u",
prefixlen,
"GATEWAY=%u.%u.%u.%u",
ADDRESS_FMT_VAL(gateway),
NULL);
link->dhcp_lease = lease;
if (link->network->dhcp_dns) {
r = sd_dhcp_lease_get_dns(lease, &nameservers, &nameservers_size);
if (r >= 0) {
r = manager_update_resolv_conf(link->manager);
if (r < 0)
log_error("Failed to update resolv.conf");
}
}
if (link->network->dhcp_mtu) {
uint16_t mtu;
r = sd_dhcp_lease_get_mtu(lease, &mtu);
if (r >= 0) {
r = link_set_mtu(link, mtu);
if (r < 0)
log_error_link(link, "Failed to set MTU "
"to %" PRIu16, mtu);
}
}
if (link->network->dhcp_hostname) {
const char *hostname;
r = sd_dhcp_lease_get_hostname(lease, &hostname);
if (r >= 0) {
r = set_hostname(link->manager->bus, hostname);
if (r < 0)
log_error("Failed to set transient hostname "
"to '%s'", hostname);
}
}
link_enter_set_addresses(link);
return 0;
}
static void dhcp_handler(sd_dhcp_client *client, int event, void *userdata) {
Link *link = userdata;
int r;
assert(link);
assert(link->network);
assert(link->manager);
if (link->state == LINK_STATE_FAILED)
return;
switch (event) {
case DHCP_EVENT_NO_LEASE:
log_debug_link(link, "IP address in use.");
break;
case DHCP_EVENT_EXPIRED:
case DHCP_EVENT_STOP:
case DHCP_EVENT_IP_CHANGE:
if (link->network->dhcp_critical) {
log_error_link(link, "DHCPv4 connection considered system critical, "
"ignoring request to reconfigure it.");
return;
}
if (link->dhcp_lease) {
r = dhcp_lease_lost(link);
if (r < 0) {
link_enter_failed(link);
return;
}
}
if (event == DHCP_EVENT_IP_CHANGE) {
r = dhcp_lease_acquired(client, link);
if (r < 0) {
link_enter_failed(link);
return;
}
}
break;
case DHCP_EVENT_IP_ACQUIRE:
r = dhcp_lease_acquired(client, link);
if (r < 0) {
link_enter_failed(link);
return;
}
break;
default:
if (event < 0)
log_warning_link(link, "DHCP error: %s", strerror(-event));
else
log_warning_link(link, "DHCP unknown event: %d", event);
break;
}
return;
}
static int link_acquire_conf(Link *link) {
int r;
assert(link);
assert(link->network);
assert(link->network->dhcp);
assert(link->manager);
assert(link->manager->event);
if (!link->dhcp_client) {
r = sd_dhcp_client_new(&link->dhcp_client);
if (r < 0)
return r;
r = sd_dhcp_client_attach_event(link->dhcp_client, NULL, 0);
if (r < 0)
return r;
r = sd_dhcp_client_set_index(link->dhcp_client, link->ifindex);
if (r < 0)
return r;
r = sd_dhcp_client_set_mac(link->dhcp_client, &link->mac);
if (r < 0)
return r;
r = sd_dhcp_client_set_callback(link->dhcp_client, dhcp_handler, link);
if (r < 0)
return r;
if (link->network->dhcp_mtu) {
r = sd_dhcp_client_set_request_option(link->dhcp_client, 26);
if (r < 0)
return r;
}
}
log_debug_link(link, "acquiring DHCPv4 lease");
r = sd_dhcp_client_start(link->dhcp_client);
if (r < 0)
return r;
return 0;
}
static int link_update_flags(Link *link, unsigned flags) {
int r;
assert(link);
assert(link->network);
if (link->state == LINK_STATE_FAILED)
return 0;
if (link->flags == flags) {
log_debug_link(link, "link status unchanged: %#.8x", flags);
return 0;
}
if ((link->flags & IFF_UP) != (flags & IFF_UP))
log_info_link(link,
"link is %s", flags & IFF_UP ? "up": "down");
if ((link->flags & IFF_LOWER_UP) != (flags & IFF_LOWER_UP)) {
if (flags & IFF_LOWER_UP) {
log_info_link(link, "carrier on");
if (link->network->dhcp) {
r = link_acquire_conf(link);
if (r < 0) {
log_warning_link(link, "Could not acquire DHCPv4 lease: %s", strerror(-r));
link_enter_failed(link);
return r;
}
}
} else {
log_info_link(link, "carrier off");
if (link->network->dhcp) {
r = sd_dhcp_client_stop(link->dhcp_client);
if (r < 0) {
log_warning_link(link, "Could not stop DHCPv4 client: %s", strerror(-r));
link_enter_failed(link);
return r;
}
}
}
}
log_debug_link(link,
"link status updated: %#.8x -> %#.8x", link->flags, flags);
link->flags = flags;
return 0;
}
static int link_up_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
Link *link = userdata;
int r;
assert(link);
if (link->state == LINK_STATE_FAILED)
return 1;
r = sd_rtnl_message_get_errno(m);
if (r < 0) {
log_struct_link(LOG_ERR, link,
"MESSAGE=%s: could not bring up interface: %s",
link->ifname, strerror(-r),
"ERRNO=%d", -r,
NULL);
link_enter_failed(link);
return 1;
}
link_update_flags(link, link->flags | IFF_UP);
return 1;
}
static int link_up(Link *link) {
_cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL;
int r;
assert(link);
assert(link->manager);
assert(link->manager->rtnl);
log_debug_link(link, "bringing link up");
r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
RTM_SETLINK, link->ifindex);
if (r < 0) {
log_error_link(link, "Could not allocate RTM_SETLINK message");
return r;
}
r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
if (r < 0) {
log_error_link(link, "Could not set link flags: %s", strerror(-r));
return r;
}
r = sd_rtnl_call_async(link->manager->rtnl, req, link_up_handler, link, 0, NULL);
if (r < 0) {
log_error_link(link,
"Could not send rtnetlink message: %s", strerror(-r));
return r;
}
return 0;
}
static int link_enslaved(Link *link) {
int r;
assert(link);
assert(link->state == LINK_STATE_ENSLAVING);
assert(link->network);
r = link_up(link);
if (r < 0) {
link_enter_failed(link);
return r;
}
if (!link->network->dhcp)
return link_enter_set_addresses(link);
return 0;
}
static int enslave_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
Link *link = userdata;
int r;
assert(link);
assert(link->state == LINK_STATE_ENSLAVING || link->state == LINK_STATE_FAILED);
assert(link->network);
link->enslaving --;
if (link->state == LINK_STATE_FAILED)
return 1;
r = sd_rtnl_message_get_errno(m);
if (r < 0) {
log_struct_link(LOG_ERR, link,
"MESSAGE=%s: could not enslave: %s",
link->ifname, strerror(-r),
"ERRNO=%d", -r,
NULL);
link_enter_failed(link);
return 1;
}
log_debug_link(link, "enslaved");
if (link->enslaving == 0)
link_enslaved(link);
return 1;
}
static int link_enter_enslave(Link *link) {
NetDev *vlan;
Iterator i;
int r;
assert(link);
assert(link->network);
assert(link->state == _LINK_STATE_INVALID);
link->state = LINK_STATE_ENSLAVING;
if (!link->network->bridge && !link->network->bond &&
hashmap_isempty(link->network->vlans))
return link_enslaved(link);
if (link->network->bridge) {
log_struct_link(LOG_DEBUG, link,
"MESSAGE=%s: enslaving by '%s'",
link->ifname, link->network->bridge->name,
NETDEV(link->network->bridge),
NULL);
r = netdev_enslave(link->network->bridge, link, &enslave_handler);
if (r < 0) {
log_struct_link(LOG_WARNING, link,
"MESSAGE=%s: could not enslave by '%s': %s",
link->ifname, link->network->bridge->name, strerror(-r),
NETDEV(link->network->bridge),
NULL);
link_enter_failed(link);
return r;
}
link->enslaving ++;
}
HASHMAP_FOREACH(vlan, link->network->vlans, i) {
log_struct_link(LOG_DEBUG, link,
"MESSAGE=%s: enslaving by '%s'",
link->ifname, vlan->name, NETDEV(vlan), NULL);
r = netdev_enslave(vlan, link, &enslave_handler);
if (r < 0) {
log_struct_link(LOG_WARNING, link,
"MESSAGE=%s: could not enslave by '%s': %s",
link->ifname, vlan->name, strerror(-r),
NETDEV(vlan), NULL);
link_enter_failed(link);
return r;
}
link->enslaving ++;
}
return 0;
}
static int link_getlink_handler(sd_rtnl *rtnl, sd_rtnl_message *m,
void *userdata) {
Link *link = userdata;
int r;
assert(link);
if (link->state == LINK_STATE_FAILED)
return 1;
r = sd_rtnl_message_get_errno(m);
if (r < 0) {
log_struct_link(LOG_ERR, link,
"MESSAGE=%s: could not get state: %s",
link->ifname, strerror(-r),
"ERRNO=%d", -r,
NULL);
link_enter_failed(link);
return 1;
}
log_debug_link(link, "got link state");
link_update(link, m);
return 1;
}
static int link_getlink(Link *link) {
_cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL;
int r;
assert(link);
assert(link->manager);
assert(link->manager->rtnl);
log_debug_link(link, "requesting link status");
r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
RTM_GETLINK, link->ifindex);
if (r < 0) {
log_error_link(link, "Could not allocate RTM_GETLINK message");
return r;
}
r = sd_rtnl_call_async(link->manager->rtnl, req, link_getlink_handler,
link, 0, NULL);
if (r < 0) {
log_error_link(link,
"Could not send rtnetlink message: %s", strerror(-r));
return r;
}
return 0;
}
int link_configure(Link *link) {
int r;
assert(link);
assert(link->network);
assert(link->state == _LINK_STATE_INVALID);
r = link_getlink(link);
if (r < 0) {
link_enter_failed(link);
return r;
}
return link_enter_enslave(link);
}
int link_update(Link *link, sd_rtnl_message *m) {
unsigned flags;
void *data;
uint16_t type;
int r;
assert(link);
assert(m);
if (link->state == LINK_STATE_FAILED)
return 0;
r = sd_rtnl_message_link_get_flags(m, &flags);
if (r < 0) {
log_warning_link(link, "Could not get link flags");
return r;
}
while (sd_rtnl_message_read(m, &type, &data) > 0) {
if (type == IFLA_MTU && link->network->dhcp &&
link->network->dhcp_mtu && !link->original_mtu) {
link->original_mtu = *(uint16_t *) data;
log_debug_link(link, "saved original MTU: %" PRIu16,
link->original_mtu);
}
}
return link_update_flags(link, flags);
}
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