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Normalize AllocatedIPs/ExtraAllowedIPs to network address before ip route replace

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A client CIDR with nonzero host bits (e.g. 10.66.120.1/30 instead of the
network 10.66.120.0/30) is tolerated by wg's own AllowedIPs/setconf, which
just warns, but plain iproute2 rejects it with "Invalid prefix for given
prefix length" and aborts the whole PostUp chain, taking the interface
down on start. Added a routeNet template func that clears host bits via
net.ParseCIDR before generating each PostUp route line.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01ATVUwTa4Pqwq26orW5BcDW
This commit is contained in:
sysops
2026-07-29 14:30:53 +02:00
co-authored by Claude Sonnet 5
parent 3e57de1b44
commit 1539c589a1
3 changed files with 237 additions and 2 deletions
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templates/wg.conf
+1 -1
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@@ -17,7 +17,7 @@ PreUp = {{ .serverConfig.Interface.PreUp }}
# "RTNETLINK: File exists" the moment two servers claim the same route,
# which used to take down every server started after the first. `replace`
# is idempotent and never fails on a pre-existing route.
PostUp = {{ .serverConfig.Interface.PostUp }}{{range .clientDataList}}{{if eq .Client.Enabled true}}{{range .Client.AllocatedIPs}}ip route replace {{.}} dev %i; {{end}}{{range .Client.ExtraAllowedIPs}}ip route replace {{.}} dev %i; {{end}}{{end}}{{end}}
PostUp = {{ .serverConfig.Interface.PostUp }}{{range .clientDataList}}{{if eq .Client.Enabled true}}{{range .Client.AllocatedIPs}}ip route replace {{routeNet .}} dev %i; {{end}}{{range .Client.ExtraAllowedIPs}}ip route replace {{routeNet .}} dev %i; {{end}}{{end}}{{end}}
PreDown = {{ .serverConfig.Interface.PreDown }}
PostDown = {{ .serverConfig.Interface.PostDown }}
Table = off