From 2f8e4e2b0615a82225a1d63b5bd767a85ceee754 Mon Sep 17 00:00:00 2001 From: Beniamino Galvani Date: Wed, 24 Aug 2022 16:50:14 +0200 Subject: [PATCH 1/2] core: log when dynamic IP configuration is restarted and why (cherry picked from commit 6cd69fde339cc69717671226e06156339de71314) --- src/core/devices/nm-device-ethernet.c | 2 +- src/core/devices/nm-device.c | 10 ++++++---- src/core/devices/nm-device.h | 2 +- src/core/devices/wifi/nm-device-wifi.c | 4 ++-- src/core/nm-manager.c | 2 +- 5 files changed, 11 insertions(+), 9 deletions(-) diff --git a/src/core/devices/nm-device-ethernet.c b/src/core/devices/nm-device-ethernet.c index 32f2fbf9b4..40c6d208e1 100644 --- a/src/core/devices/nm-device-ethernet.c +++ b/src/core/devices/nm-device-ethernet.c @@ -451,7 +451,7 @@ supplicant_auth_state_changed(NMSupplicantInterface *iface, if (state == NM_SUPPLICANT_AUTH_STATE_SUCCESS) { nm_clear_g_signal_handler(priv->supplicant.iface, &priv->supplicant.iface_state_id); - nm_device_update_dynamic_ip_setup(NM_DEVICE(self)); + nm_device_update_dynamic_ip_setup(NM_DEVICE(self), "supplicant auth state changed"); } } diff --git a/src/core/devices/nm-device.c b/src/core/devices/nm-device.c index df7fb37f41..7585acf4d3 100644 --- a/src/core/devices/nm-device.c +++ b/src/core/devices/nm-device.c @@ -6332,7 +6332,7 @@ _dev_unmanaged_check_external_down(NMDevice *self, gboolean only_if_unmanaged, g } void -nm_device_update_dynamic_ip_setup(NMDevice *self) +nm_device_update_dynamic_ip_setup(NMDevice *self, const char *reason) { NMDevicePrivate *priv; @@ -6343,6 +6343,8 @@ nm_device_update_dynamic_ip_setup(NMDevice *self) if (priv->state < NM_DEVICE_STATE_IP_CONFIG || priv->state > NM_DEVICE_STATE_ACTIVATED) return; + _LOGD(LOGD_DEVICE, "restarting dynamic IP configuration (%s)", reason); + g_hash_table_remove_all(priv->ip6_saved_properties); if (priv->ipdhcp_data_4.state != NM_DEVICE_IP_STATE_NONE) @@ -6742,7 +6744,7 @@ device_link_changed(gpointer user_data) /* Update DHCP, etc, if needed */ if (ip_ifname_changed) - nm_device_update_dynamic_ip_setup(self); + nm_device_update_dynamic_ip_setup(self, "IP interface changed"); was_up = priv->up; priv->up = NM_FLAGS_HAS(pllink->n_ifi_flags, IFF_UP); @@ -6802,7 +6804,7 @@ device_link_changed(gpointer user_data) * renew DHCP leases and such. */ if (priv->state == NM_DEVICE_STATE_ACTIVATED) { - nm_device_update_dynamic_ip_setup(self); + nm_device_update_dynamic_ip_setup(self, "interface got carrier"); } } @@ -6864,7 +6866,7 @@ device_ip_link_changed(gpointer user_data) priv->ip_iface_ = g_strdup(ip_iface); update_prop_ip_iface(self); - nm_device_update_dynamic_ip_setup(self); + nm_device_update_dynamic_ip_setup(self, "interface renamed"); } return G_SOURCE_REMOVE; diff --git a/src/core/devices/nm-device.h b/src/core/devices/nm-device.h index 382c866053..de850e68f2 100644 --- a/src/core/devices/nm-device.h +++ b/src/core/devices/nm-device.h @@ -764,7 +764,7 @@ void nm_device_update_metered(NMDevice *self); gboolean nm_device_update_hw_address(NMDevice *self); void nm_device_update_initial_hw_address(NMDevice *self); void nm_device_update_permanent_hw_address(NMDevice *self, gboolean force_freeze); -void nm_device_update_dynamic_ip_setup(NMDevice *self); +void nm_device_update_dynamic_ip_setup(NMDevice *self, const char *reason); guint nm_device_get_supplicant_timeout(NMDevice *self); gboolean nm_device_auth_retries_try_next(NMDevice *self); diff --git a/src/core/devices/wifi/nm-device-wifi.c b/src/core/devices/wifi/nm-device-wifi.c index 39c68d777f..43798b85ad 100644 --- a/src/core/devices/wifi/nm-device-wifi.c +++ b/src/core/devices/wifi/nm-device-wifi.c @@ -2520,7 +2520,7 @@ supplicant_iface_state(NMDeviceWifi *self, _LOGD(LOGD_WIFI, "supplicant state settled after roaming, renew dynamic IP configuration"); nm_clear_g_source_inst(&priv->roam_supplicant_wait_source); - nm_device_update_dynamic_ip_setup(device); + nm_device_update_dynamic_ip_setup(device, "roamed to a different AP"); } } break; @@ -2663,7 +2663,7 @@ supplicant_iface_notify_current_bss(NMSupplicantInterface *iface, if (nm_supplicant_interface_get_state(priv->sup_iface) == NM_SUPPLICANT_INTERFACE_STATE_COMPLETED) { - nm_device_update_dynamic_ip_setup(NM_DEVICE(self)); + nm_device_update_dynamic_ip_setup(NM_DEVICE(self), "roamed to a different AP"); } else { /* Wait that the authentication to new the AP completes before * trying to renew, otherwise the DHCP REQUEST could be lost diff --git a/src/core/nm-manager.c b/src/core/nm-manager.c index 3af24aa00b..822df7ad3b 100644 --- a/src/core/nm-manager.c +++ b/src/core/nm-manager.c @@ -6580,7 +6580,7 @@ do_sleep_wake(NMManager *self, gboolean sleeping_changed) && !nm_device_get_unmanaged_flags(device, NM_UNMANAGED_SLEEPING)) { /* DHCP leases of software devices could have gone stale * so we need to renew them. */ - nm_device_update_dynamic_ip_setup(device); + nm_device_update_dynamic_ip_setup(device, "wake up"); continue; } From 5a49a2f6b20e6d124ac705e79ab7d5df3837b8c1 Mon Sep 17 00:00:00 2001 From: Beniamino Galvani Date: Wed, 24 Aug 2022 16:52:52 +0200 Subject: [PATCH 2/2] 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 (cherry picked from commit 905adabdba033bbfc33013d0ad203bd444131dc5) --- src/core/devices/nm-device.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/src/core/devices/nm-device.c b/src/core/devices/nm-device.c index 7585acf4d3..d63b902b16 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);