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device: don't modify the device MTU if it's unset

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The MTU of 0 means default, not zero-length packets:

  <warn>  (wlp3s0): Lowering IPv6 MTU (1472) to match device MTU (0)
  <warn>  (wlp3s0): IPv6 MTU (0) smaller than 1280, adjusting
  <warn>  (wlp3s0): Raising device MTU (0) to match IPv6 MTU (1280)
  <error> [1437068831.306733] [platform/nm-linux-platform.c:2440] sysctl_set(): platform-linux: sysctl: failed to set '/proc/sys/net/ipv6/conf/wlp3s0/mtu' to '1472': (22) Invalid argument

Reported-by:  Jan Alexander Steffens <jan.steffens@gmail.com>

https://bugzilla.gnome.org/show_bug.cgi?id=752508
(cherry picked from commit a92d8b0c67)
This commit is contained in:
Lubomir Rintel 2015-07-20 18:10:08 +02:00
parent 375100715f
commit 82da29746d
1 changed files with 3 additions and 3 deletions
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6
src/devices/nm-device.c
View file

@ -4492,19 +4492,19 @@ nm_device_ipv6_set_mtu (NMDevice *self, guint32 mtu)
priv->ip6_mtu = mtu ?: plat_mtu;
if (priv->ip6_mtu && priv->mtu < priv->ip6_mtu) {
if (priv->ip6_mtu && priv->mtu && priv->mtu < priv->ip6_mtu) {
_LOGW (LOGD_DEVICE | LOGD_IP6, "Lowering IPv6 MTU (%d) to match device MTU (%d)",
priv->ip6_mtu, priv->mtu);
priv->ip6_mtu = priv->mtu;
}
if (priv->ip6_mtu < 1280) {
if (priv->ip6_mtu && priv->ip6_mtu < 1280) {
_LOGW (LOGD_DEVICE | LOGD_IP6, "IPv6 MTU (%d) smaller than 1280, adjusting",
priv->ip6_mtu);
priv->ip6_mtu = 1280;
}
if (priv->mtu < priv->ip6_mtu) {
if (priv->ip6_mtu && priv->mtu && priv->mtu < priv->ip6_mtu) {
_LOGW (LOGD_DEVICE | LOGD_IP6, "Raising device MTU (%d) to match IPv6 MTU (%d)",
priv->mtu, priv->ip6_mtu);
nm_device_set_mtu (self, priv->ip6_mtu);