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device: refactor nm_device_set_ip_ifindex() and set_ip_iface()

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- don't even bother to look into the platform cache, but use
  if_indextoname() / if_nametoindex(). In most cases, we obtained
  the ifindex/ifname not from the platform cache in the first
  place. Hence, there is a race, where the interface might not
  exist.
  However, try to process events of the platform cache, hoping
  that the cache contains an interface for the given ifindex/ifname.

- let set_ip_ifindex() and set_ip_iface() both return a boolean
  value to indicate whether a ip-interface is set or not. That is,
  whether we have a positive ip_ifindex. That seems more interesting
  information, then to return whether anything changed.

- as before, set_ip_ifindex() can only clear an ifindex/ifname,
  or error out without doing anything. That is different from
  set_ip_iface(), which will also set an ifname if no ifindex
  can be resolved. That is curreently ugly, because then ip-ifindex
  and ip-iface don't agree. That shall be improved in the future
  by:
  - trying to set an interface that cannot be resolved shall
    lead to a disconnect in any case.
  - we shall make less use of the ip-iface and rely more on the
    ifindex.
This commit is contained in:
Thomas Haller
2018-01-10 16:33:13 +01:00
parent 79980536b9
commit ab4578302d
2 changed files with 66 additions and 90 deletions
Download Patch File Download Diff File Expand all files Collapse all files

150
src/devices/nm-device.c
View File

@@ -1282,126 +1282,102 @@ nm_device_get_ip_ifindex (const NMDevice *self)
return priv->ip_iface ? priv->ip_ifindex : priv->ifindex;
}
gboolean
nm_device_set_ip_ifindex (NMDevice *self, int ifindex)
static void
_set_ip_ifindex (NMDevice *self,
int ifindex,
const char *ifname)
{
NMDevicePrivate *priv;
NMDevicePrivate *priv = NM_DEVICE_GET_PRIVATE (self);
NMPlatform *platform;
const char *name = NULL;
gboolean eq_name;
g_return_val_if_fail (NM_IS_DEVICE (self), FALSE);
/* we can set only the ifname without ifindex (to indicate that this
* is an ip-interface, but lookup for the ifindex failed.
* But we cannot just set ifindex > 0 without an ifname. */
nm_assert (ifindex <= 0 || ifname);
priv = NM_DEVICE_GET_PRIVATE (self);
platform = nm_device_get_platform (self);
/* normalize ifindex */
if (ifindex < 0)
ifindex = 0;
if (ifindex > 0) {
const NMPlatformLink *plink;
eq_name = nm_streq0 (priv->ip_iface, ifname);
plink = nm_platform_link_get (platform, ifindex);
if (!plink) {
nm_platform_process_events (platform);
plink = nm_platform_link_get (NM_PLATFORM_GET, ifindex);
}
if (!plink) {
_LOGW (LOGD_DEVICE, "ip-ifindex: ifindex %d not found", ifindex);
return FALSE;
}
name = plink->name;
} else
g_return_val_if_fail (ifindex == 0, FALSE);
if ( eq_name
&& priv->ip_ifindex == ifindex)
return;
if (priv->ip_ifindex == ifindex)
return TRUE;
_LOGD (LOGD_DEVICE, "ip-ifindex: update ip-interface to %s%s%s, ifindex %d",
NM_PRINT_FMT_QUOTE_STRING (ifname),
ifindex);
_LOGD (LOGD_DEVICE, "ip-ifindex: update ifindex to %d", ifindex);
priv->ip_ifindex = ifindex;
if (!nm_streq0 (priv->ip_iface, name)) {
_LOGD (LOGD_DEVICE, "ip-ifindex: update ip-iface to %s%s%s",
NM_PRINT_FMT_QUOTED (name, "\"", name, "\"", "NULL"));
priv->ip_iface = g_strdup (name);
if (!eq_name) {
g_free (priv->ip_iface);
priv->ip_iface = g_strdup (ifname);
_notify (self, PROP_IP_IFACE);
}
if (priv->ip_ifindex > 0) {
if (nm_platform_check_kernel_support (nm_device_get_platform (self),
NM_PLATFORM_KERNEL_SUPPORT_USER_IPV6LL))
nm_platform_link_set_user_ipv6ll_enabled (nm_device_get_platform (self), priv->ip_ifindex, TRUE);
platform = nm_device_get_platform (self);
if (!nm_platform_link_is_up (nm_device_get_platform (self), priv->ip_ifindex))
nm_platform_link_set_up (nm_device_get_platform (self), priv->ip_ifindex, NULL);
nm_platform_process_events_ensure_link (platform,
priv->ip_ifindex,
priv->ip_iface);
if (nm_platform_check_kernel_support (platform,
NM_PLATFORM_KERNEL_SUPPORT_USER_IPV6LL))
nm_platform_link_set_user_ipv6ll_enabled (platform, priv->ip_ifindex, TRUE);
if (!nm_platform_link_is_up (platform, priv->ip_ifindex))
nm_platform_link_set_up (platform, priv->ip_ifindex, NULL);
}
/* We don't care about any saved values from the old iface */
g_hash_table_remove_all (priv->ip6_saved_properties);
}
return TRUE;
gboolean
nm_device_set_ip_ifindex (NMDevice *self, int ifindex)
{
char ifname_buf[IFNAMSIZ];
const char *ifname = NULL;
g_return_val_if_fail (NM_IS_DEVICE (self), FALSE);
if (ifindex > 0) {
ifname = nm_platform_if_indextoname (nm_device_get_platform (self), ifindex, ifname_buf);
if (!ifname) {
_LOGW (LOGD_DEVICE, "ip-ifindex: ifindex %d not found", ifindex);
return FALSE;
}
}
_set_ip_ifindex (self, ifindex, ifname);
return ifindex > 0;
}
/**
* nm_device_set_ip_iface:
* @self: the #NMDevice
* @iface: the new IP interface name
* @ifname: the new IP interface name
*
* Updates the IP interface name and possibly the ifindex.
*
* Returns: %TRUE if the anything (name or ifindex) changed, %FALSE if nothing
* changed.
* Returns: %TRUE if an interface with name @ifname exists,
* and %FALSE, if @ifname is %NULL or no such interface exists.
*/
gboolean
nm_device_set_ip_iface (NMDevice *self, const char *iface)
nm_device_set_ip_iface (NMDevice *self, const char *ifname)
{
NMDevicePrivate *priv;
int ifindex;
int ifindex = 0;
g_return_val_if_fail (NM_IS_DEVICE (self), FALSE);
priv = NM_DEVICE_GET_PRIVATE (self);
if (nm_streq0 (iface, priv->ip_iface)) {
if (!iface)
return FALSE;
ifindex = nm_platform_if_nametoindex (nm_device_get_platform (self), iface);
if ( ifindex <= 0
|| priv->ip_ifindex == ifindex)
return FALSE;
if (ifname)
ifindex = nm_platform_if_nametoindex (nm_device_get_platform (self), ifname);
priv->ip_ifindex = ifindex;
_LOGD (LOGD_DEVICE, "ip-ifname: update ifindex for ifname '%s': %d", iface, priv->ip_ifindex);
} else {
g_free (priv->ip_iface);
priv->ip_iface = g_strdup (iface);
if (iface) {
/* The @iface name is not in sync with the platform cache.
* So, there is no point asking the platform cache to resolve
* the ifindex. Instead, we can only hope that the interface
* with this name still exists and we resolve the ifindex
* anew.
*/
priv->ip_ifindex = nm_platform_if_nametoindex (nm_device_get_platform (self), iface);
if (priv->ip_ifindex > 0)
_LOGD (LOGD_DEVICE, "ip-ifname: set ifname '%s', ifindex %d", iface, priv->ip_ifindex);
else
_LOGW (LOGD_DEVICE, "ip-ifname: set ifname '%s', unknown ifindex", iface);
} else {
priv->ip_ifindex = 0;
_LOGD (LOGD_DEVICE, "ip-ifname: clear ifname");
}
}
if (priv->ip_ifindex > 0) {
if (nm_platform_check_kernel_support (nm_device_get_platform (self),
NM_PLATFORM_KERNEL_SUPPORT_USER_IPV6LL))
nm_platform_link_set_user_ipv6ll_enabled (nm_device_get_platform (self), priv->ip_ifindex, TRUE);
if (!nm_platform_link_is_up (nm_device_get_platform (self), priv->ip_ifindex))
nm_platform_link_set_up (nm_device_get_platform (self), priv->ip_ifindex, NULL);
}
/* We don't care about any saved values from the old iface */
g_hash_table_remove_all (priv->ip6_saved_properties);
_notify (self, PROP_IP_IFACE);
return TRUE;
_set_ip_ifindex (self, ifindex, ifname);
return ifindex > 0;
}
static gboolean
@@ -12941,7 +12917,7 @@ _cleanup_generic_post (NMDevice *self, CleanupType cleanup_type)
* those are identified by ip_iface, not by iface (which might be a tty
* or ATM device).
*/
nm_device_set_ip_iface (self, NULL);
_set_ip_ifindex (self, 0, NULL);
}
/*

6
src/devices/wwan/nm-device-modem.c
View File

@@ -263,17 +263,17 @@ static void
data_port_changed_cb (NMModem *modem, GParamSpec *pspec, gpointer user_data)
{
NMDevice *self = NM_DEVICE (user_data);
gboolean changed;
gboolean has_ifindex;
/* We set the IP iface in the device as soon as we know it, so that we
* properly ifup it if needed */
changed = nm_device_set_ip_iface (self, nm_modem_get_data_port (modem));
has_ifindex = nm_device_set_ip_iface (self, nm_modem_get_data_port (modem));
/* Disable IPv6 immediately on the interface since NM handles IPv6
* internally, and leaving it enabled could allow the kernel's IPv6
* RA handling code to run before NM is ready.
*/
if (changed)
if (has_ifindex)
nm_device_ipv6_sysctl_set (self, "disable_ipv6", "1");
}