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FS#4042 - netifd forces up dhcp interfaces set admin-down with "ip link set $I down" #9030

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openwrt-bot opened this issue Sep 17, 2021 · 0 comments
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flyspray release/21.02

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@openwrt-bot openwrt-bot commented Sep 17, 2021

BradG:

netifd will immediately and automatically set an interface active/up which has been administratively disabled with either the "ip link set $I down" or "ifconfig $I down" commands.

This problem will only occur if the interface proto is configured for "dhcp" rather than "static". This appears to be related to the behavior induced by the "force_link" option, however force_link suppresses hotplug events (which breaks my use-case) and probably has other undesirable side-effects.

Below is a sample log where "ip link set eth0.1 down" is used against the "lan" interface-configuration. Note that identical behavior is also observed on a typical ethernet interface (eth0) where there is no intermediate switch or VLAN-interfaces involved.

Sat Sep 11 00:39:59 2021 daemon.notice netifd: VLAN 'eth0.1' link is down
Sat Sep 11 00:39:59 2021 daemon.notice netifd: Interface 'lan' has link connectivity loss
Sat Sep 11 00:39:59 2021 kern.info kernel: [48844.417075] device eth0 left promiscuous mode
Sat Sep 11 00:39:59 2021 daemon.notice netifd: lan (28106): udhcpc: received SIGTERM
Sat Sep 11 00:39:59 2021 daemon.notice netifd: Interface 'lan' is now down
Sat Sep 11 00:39:59 2021 daemon.notice netifd: Interface 'lan' is disabled
Sat Sep 11 00:39:59 2021 daemon.notice netifd: Interface 'lan' is enabled
Sat Sep 11 00:39:59 2021 daemon.notice netifd: VLAN 'eth0.1' link is up
Sat Sep 11 00:39:59 2021 daemon.notice netifd: Interface 'lan' has link connectivity
Sat Sep 11 00:39:59 2021 daemon.notice netifd: Interface 'lan' is setting up now
Sat Sep 11 00:39:59 2021 daemon.notice netifd: lan (29997): udhcpc: started, v1.30.1
Sat Sep 11 00:39:59 2021 kern.info kernel: [48845.042493] device eth0 entered promiscuous mode
Sat Sep 11 00:39:59 2021 daemon.notice netifd: lan (29997): udhcpc: sending discover
Sat Sep 11 00:39:59 2021 daemon.notice netifd: lan (29997): udhcpc: sending select for 192.168.0.148
Sat Sep 11 00:39:59 2021 daemon.notice netifd: lan (29997): udhcpc: lease of 192.168.0.148 obtained, lease time 43200
Sat Sep 11 00:40:00 2021 daemon.notice netifd: Interface 'lan' is now up
Sat Sep 11 00:40:01 2021 user.notice firewall: Reloading firewall due to ifup of lan (eth0.1)

This behavior was verified on multiple 21.02 and 19.07 devices.

@aparcar aparcar added the release/21.02 label Feb 22, 2022
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