diff options
| author | Beniamino Galvani <bgalvani@redhat.com> | 2022-08-24 16:52:52 +0200 |
|---|---|---|
| committer | Thomas Haller <thaller@redhat.com> | 2022-08-25 23:19:13 +0200 |
| commit | 905adabdba033bbfc33013d0ad203bd444131dc5 (patch) | |
| tree | 1a10481c24f85a3cc634d242185417d1765fd88f | |
| parent | 6cd69fde339cc69717671226e06156339de71314 (diff) | |
| download | NetworkManager-905adabdba033bbfc33013d0ad203bd444131dc5.tar.gz | |
device: restart DHCP when the MAC changes
If the MAC changes there is the possibility that the DHCP client will
not be able to renew the address because it uses the old MAC as
CHADDR. Depending on the implementation, the DHCP server might use
CHADDR (so, the old address) as the destination MAC for DHCP replies,
and those packets will be lost.
To avoid this problem, restart the DHCP client when the MAC changes.
https://bugzilla.redhat.com/show_bug.cgi?id=2110000
| -rw-r--r-- | src/core/devices/nm-device.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/src/core/devices/nm-device.c b/src/core/devices/nm-device.c index 44f799f4a8..1df99a82ee 100644 --- a/src/core/devices/nm-device.c +++ b/src/core/devices/nm-device.c @@ -6646,6 +6646,7 @@ device_link_changed(gpointer user_data) NMDeviceClass *klass = NM_DEVICE_GET_CLASS(self); NMDevicePrivate *priv = NM_DEVICE_GET_PRIVATE(self); gboolean ip_ifname_changed = FALSE; + gboolean hw_addr_changed; nm_auto_nmpobj const NMPObject *pllink_keep_alive = NULL; const NMPlatformLink *pllink; const char *str; @@ -6692,9 +6693,9 @@ device_link_changed(gpointer user_data) if (ifindex == nm_device_get_ip_ifindex(self)) _stats_update_counters_from_pllink(self, pllink); - had_hw_addr = (priv->hw_addr != NULL); - nm_device_update_hw_address(self); - got_hw_addr = (!had_hw_addr && priv->hw_addr); + had_hw_addr = (priv->hw_addr != NULL); + hw_addr_changed = nm_device_update_hw_address(self); + got_hw_addr = (!had_hw_addr && priv->hw_addr); nm_device_update_permanent_hw_address(self, FALSE); if (pllink->name[0] && !nm_streq(priv->iface, pllink->name)) { @@ -6745,6 +6746,8 @@ device_link_changed(gpointer user_data) /* Update DHCP, etc, if needed */ if (ip_ifname_changed) nm_device_update_dynamic_ip_setup(self, "IP interface changed"); + else if (hw_addr_changed) + nm_device_update_dynamic_ip_setup(self, "hw-address changed"); was_up = priv->up; priv->up = NM_FLAGS_HAS(pllink->n_ifi_flags, IFF_UP); |