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devices: send ARPs when configuring static IPv4 addresses (rh #1073447)

Browse source 
After applying a configuration with static IPv4 addresses, call
/sbin/arping to announce the new addresses to the host's neighbors.
(Basic idea copied from Fedora ifup-eth.)
This commit is contained in:
Dan Winship 2014-03-19 12:39:38 -04:00
parent 7ff7df7640
commit 01f41506fb
1 changed files with 99 additions and 1 deletions
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100
src/devices/nm-device.c
View file

@ -262,6 +262,7 @@ typedef struct {
NMDHCP4Config * dhcp4_config;
NMIP4Config * vpn4_config; /* routes added by a VPN which uses this device */
guint arp_round2_id;
PingInfo gw_ping;
/* dnsmasq stuff for shared connections */
@ -4344,6 +4345,99 @@ start_sharing (NMDevice *self, NMIP4Config *config)
return TRUE;
}
static void
send_arps (NMDevice *self, const char *mode_arg)
{
const char *argv[] = { "/sbin/arping", mode_arg, "-q", "-I", nm_device_get_ip_iface (self), "-c", "1", NULL, NULL };
int ip_arg = G_N_ELEMENTS (argv) - 2;
NMConnection *connection;
NMSettingIP4Config *s_ip4;
int i, num;
NMIP4Address *addr;
guint32 ipaddr;
GError *error = NULL;
connection = nm_device_get_connection (self);
if (!connection)
return;
s_ip4 = nm_connection_get_setting_ip4_config (connection);
if (!s_ip4)
return;
num = nm_setting_ip4_config_get_num_addresses (s_ip4);
for (i = 0; i < num; i++) {
addr = nm_setting_ip4_config_get_address (s_ip4, i);
ipaddr = nm_ip4_address_get_address (addr);
argv[ip_arg] = (char *) nm_utils_inet4_ntop (ipaddr, NULL);
nm_log_dbg (LOGD_DEVICE | LOGD_IP4,
"Running arping %s -I %s %s",
mode_arg, nm_device_get_iface (self), argv[ip_arg]);
g_spawn_async (NULL, (char **) argv, NULL,
G_SPAWN_STDOUT_TO_DEV_NULL | G_SPAWN_STDERR_TO_DEV_NULL,
nm_unblock_posix_signals,
NULL, NULL, &error);
if (error) {
nm_log_warn (LOGD_DEVICE | LOGD_IP4,
"Could not send ARP for local address %s: %s",
argv[ip_arg], error->message);
g_clear_error (&error);
}
}
}
static gboolean
arp_announce_round2 (gpointer self)
{
NMDevicePrivate *priv = NM_DEVICE_GET_PRIVATE (self);
priv->arp_round2_id = 0;
if ( priv->state >= NM_DEVICE_STATE_IP_CONFIG
&& priv->state <= NM_DEVICE_STATE_ACTIVATED)
send_arps (self, "-U");
return G_SOURCE_REMOVE;
}
static void
arp_cleanup (NMDevice *self)
{
NMDevicePrivate *priv = NM_DEVICE_GET_PRIVATE (self);
if (priv->arp_round2_id) {
g_source_remove (priv->arp_round2_id);
priv->arp_round2_id = 0;
}
}
static void
arp_announce (NMDevice *self)
{
NMDevicePrivate *priv = NM_DEVICE_GET_PRIVATE (self);
NMConnection *connection;
NMSettingIP4Config *s_ip4;
int num;
arp_cleanup (self);
/* We only care about manually-configured addresses; DHCP- and autoip-configured
* ones should already have been seen on the network at this point.
*/
connection = nm_device_get_connection (self);
if (!connection)
return;
s_ip4 = nm_connection_get_setting_ip4_config (connection);
if (!s_ip4)
return;
num = nm_setting_ip4_config_get_num_addresses (s_ip4);
if (num == 0)
return;
send_arps (self, "-A");
priv->arp_round2_id = g_timeout_add_seconds (2, arp_announce_round2, self);
}
static gboolean
nm_device_activate_ip4_config_commit (gpointer user_data)
{
@ -4392,6 +4486,8 @@ nm_device_activate_ip4_config_commit (gpointer user_data)
}
}
arp_announce (self);
/* Enter the IP_CHECK state if this is the first method to complete */
priv->ip4_state = IP_DONE;
if (nm_device_get_state (self) == NM_DEVICE_STATE_IP_CONFIG)
@ -4799,6 +4895,7 @@ nm_device_cleanup (NMDevice *self, NMDeviceStateReason reason)
priv->ip4_state = priv->ip6_state = IP_NONE;
dhcp4_cleanup (self, TRUE, FALSE);
arp_cleanup (self);
dhcp6_cleanup (self, TRUE, FALSE);
linklocal6_cleanup (self);
addrconf6_cleanup (self);
@ -5581,8 +5678,9 @@ dispose (GObject *object)
nm_device_queued_state_clear (self);
nm_device_queued_ip_config_change_clear (self);
/* Clean up and stop DHCP */
/* Clean up and stop address configuration */
dhcp4_cleanup (self, deconfigure, FALSE);
arp_cleanup (self);
dhcp6_cleanup (self, deconfigure, FALSE);
linklocal6_cleanup (self);
addrconf6_cleanup (self);