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device: enforce a link MTU of at least 1280 for connections with IPv6

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This commit is contained in:
Thomas Haller 2017-01-16 14:58:11 +01:00
parent 22e8af6242
commit 665e398022
1 changed files with 16 additions and 0 deletions
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16
src/devices/nm-device.c
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@ -6653,6 +6653,22 @@ _commit_mtu (NMDevice *self, const NMIP4Config *config)
}
}
if (mtu_desired && mtu_desired < 1280) {
NMSettingIPConfig *s_ip6;
s_ip6 = (NMSettingIPConfig *) nm_device_get_applied_setting (self, NM_TYPE_SETTING_IP6_CONFIG);
if (s_ip6 && nm_streq0 (nm_setting_ip_config_get_method (s_ip6),
NM_SETTING_IP6_CONFIG_METHOD_IGNORE)) {
/* the interface has IPv6 enabled. The MTU with IPv6 cannot be smaller
* then 1280.
*
* For slave-devices (that don't have @s_ip6 we) don't do this fixup because
* it's anyway an unsolved problem when the slave configures a conflicting
* MTU. */
mtu_desired = 1280;
}
}
ip6_mtu = priv->ip6_mtu;
if (!ip6_mtu && !priv->mtu_initialized) {
/* initially, if the IPv6 MTU is not specified, grow it as large as the