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Not all pyroute2 versions which ship IPRoute() support subscribing to RTNL
multicast groups. If subscribing fails, fallback to all messages.
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Move to the re-implementation of the commit in progress check added in
commit 002d45b70efd ("vyos.commit: T8781: move from O(n) to O(1) for
commit_in_progress() checks").
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message (#5199)
* vyos-netlinkd: T8781: do not call commit_in_progress() for EVERY netlink message
Signed-off-by: Fabrizzio Petrucci <fabrizziopm@compumundohipermegared.one>
* vyos-netlinkd: T8781: restrict netlink subscription to link multicast group
Bind IPRoute with RTMGRP_LINK only so route/rule/neighbour/address updates
(e.g. full-table BGP) are not delivered to this socket.
Add a match wildcard so unexpected message types do not raise MatchError and
get logged as generic errors.
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Signed-off-by: Fabrizzio Petrucci <fabrizziopm@compumundohipermegared.one>
Co-authored-by: Fabrizzio Petrucci <fabrizziopm@compumundohipermegared.one>
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Failures appear during PPPoEIf.remove() -> flush_addrs() -> set_dhcpv6(False),
where disable uses self._cmd(f'systemctl stop ...'), which raises on any
non-zero exit code of cmd().
PermissionError: [Errno 1] is misleading: cmd() raises OSError(exit_code,
feedback); exit code 1 maps to PermissionError in Python 3, so logs point at
"permissions" while the real signal is systemctl stop returned 1 (job failure,
timeout, restart contention with Restart=always on dhcp6c@.service.
Add a small systemd teardown helper stop_systemd_unit() validating the return
codes from the "systemctl stop" calls.
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strace: Process 16362 attached
[pid 16362] execve("/bin/cli-shell-api", ["/bin/cli-shell-api", "--show-active-only", "showConfig", "interfaces"], ...) = 0
[pid 16362] +++ exited with 0 +++
--- SIGCHLD ...
strace: Process 16363 attached
[pid 16363] execve("/bin/cli-shell-api", ["/bin/cli-shell-api", "--show-active-only", "showConfig", "interfaces"], ...) = 0
[pid 16363] +++ exited with 0 +++
--- SIGCHLD ...
This would appear to be due to vyos-netlinkd calling op_mode_config_dict() more
than is necessary: it can be called only when it may be applicable (this patch).
Co-Authored-by: John Estabrook <jestabro@vyos.io>
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Implementing a daemon that listens for netlink messages in Python was discussed
for many years. This is a proof-of-concept implementation how we can listen for
netlink messages and process them in Python.
Python 3.10 minimum is required due to the use of case statements which mimics
C-style switch/case instructions.
Add example:
set interfaces ethernet eth1 vif 21 address dhcp
set interfaces ethernet eth1 vif 21 address dhcpv6
commit
If network cable is unplugged:
vyos-netlinkd[12681]: RTM_NEWLINK -> eth3.10, state=DOWN, mac=00:50:56:b3:9d:8e
vyos-netlinkd[12681]: Stopping dhclient@eth3.10.service...
vyos-netlinkd[12681]: Stopping dhcp6c@eth3.10.service...
If cable is plugged back in:
vyos-netlinkd[12681]: RTM_NEWLINK -> eth3.10, state=DOWN, mac=00:50:56:b3:9d:8e
vyos-netlinkd[12681]: RTM_NEWLINK -> eth3.10, state=UP, mac=00:50:56:b3:9d:8e
vyos-netlinkd[12681]: Restarting dhclient@eth3.10.service...
vyos-netlinkd[12681]: Restarting dhcp6c@eth3.10.service...
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