[PR #6829] [client] Preserve routed allowed IPs across lazy connection switch #27220

New Issue

saavagebueno · 2026-08-05T07:08:23-04:00

saavagebueno commented

2026-08-05 07:08:23 -04:00

Original Pull Request: https://github.com/netbirdio/netbird/pull/6829

State: closed
Merged: No

Describe your changes

When a routing peer goes idle under lazy connections, the WireGuard peer is removed and re-created as a wake endpoint. The route manager deliberately keeps routed prefixes installed on idle peers, but its asynchronous re-add uses update_only, which is a silent no-op while the peer is absent. When the re-add races into the removal/re-arm window, the routed subnet is left out of the peer's allowed IPs — and since the peer's status does not change again, nothing retries the add: traffic to the subnet is black-holed until the peer is woken by other means (e.g. a ping to its overlay IP).

Split the idle transition from the full close: Conn.Idle tears down transports, cancels pending delayed endpoint updates and updates the status without touching the WireGuard peer. The activity listener then arms the wake endpoint via the new IdlePeerEndpoint operation, which removes and re-creates the peer in a single transaction: handshake state is dropped (keeping the handshake-first wake semantics of packet staging and first-packet capture/reinjection) while the currently installed allowed IPs are preserved. The read-modify-write runs under the interface mutex, serializing it against concurrent allowed IP updates from the route manager — a concurrent add either lands before the read (included in the re-created set) or after the transaction (on the existing peer), so the race window is gone by construction.

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Is it a bug fix
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Is a feature enhancement
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This change does not modify the public API, gRPC protocols, functionality behavior, CLI / service flags, or introduce a new feature — OR I have discussed it with the NetBird team beforehand (link the issue / Slack thread in the description). See CONTRIBUTING.md.

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Summary by CodeRabbit

New Features
- Improved lazy connection handling by switching peers to a wake (“idle”) endpoint while preserving configured allowed IPs/routes.
- Automatically recreates peers when they’re missing during lazy connection setup.
- Idle behavior now retains the existing peer configuration to support faster reconnection.
Bug Fixes
- Prevents scheduled/queued endpoint updates from applying after a peer becomes idle.
- Refined close/idle transitions and cleanup to ensure consistent peer endpoint behavior.

**Original Pull Request:** https://github.com/netbirdio/netbird/pull/6829 **State:** closed **Merged:** No --- ## Describe your changes When a routing peer goes idle under lazy connections, the WireGuard peer is removed and re-created as a wake endpoint. The route manager deliberately keeps routed prefixes installed on idle peers, but its asynchronous re-add uses update_only, which is a silent no-op while the peer is absent. When the re-add races into the removal/re-arm window, the routed subnet is left out of the peer's allowed IPs — and since the peer's status does not change again, nothing retries the add: traffic to the subnet is black-holed until the peer is woken by other means (e.g. a ping to its overlay IP). Split the idle transition from the full close: Conn.Idle tears down transports, cancels pending delayed endpoint updates and updates the status without touching the WireGuard peer. The activity listener then arms the wake endpoint via the new IdlePeerEndpoint operation, which removes and re-creates the peer in a single transaction: handshake state is dropped (keeping the handshake-first wake semantics of packet staging and first-packet capture/reinjection) while the currently installed allowed IPs are preserved. The read-modify-write runs under the interface mutex, serializing it against concurrent allowed IP updates from the route manager — a concurrent add either lands before the read (included in the re-created set) or after the transaction (on the existing peer), so the race window is gone by construction. ## Issue ticket number and link ## Stack  ### Checklist - [x] Is it a bug fix - [ ] Is a typo/documentation fix - [ ] Is a feature enhancement - [ ] It is a refactor - [ ] Created tests that fail without the change (if possible) - [ ] This change does **not** modify the public API, gRPC protocols, functionality behavior, CLI / service flags, or introduce a new feature — **OR** I have discussed it with the NetBird team beforehand (link the issue / Slack thread in the description). See [CONTRIBUTING.md](https://github.com/netbirdio/netbird/blob/main/CONTRIBUTING.md#discuss-changes-with-the-netbird-team-first). > By submitting this pull request, you confirm that you have read and agree to the terms of the [Contributor License Agreement](https://github.com/netbirdio/netbird/blob/main/CONTRIBUTOR_LICENSE_AGREEMENT.md). ## Documentation Select exactly one: - [ ] I added/updated documentation for this change - [x] Documentation is **not needed** for this change (explain why) ### Docs PR URL (required if "docs added" is checked) Paste the PR link from https://github.com/netbirdio/docs here: https://github.com/netbirdio/docs/pull/__  --- <a href="https://app.blacksmith.sh/netbirdio/codesmith/netbird/pr/6829"><picture><source media="(prefers-color-scheme: dark)" srcset="https://pr-comments-assets.blacksmith.sh/codesmith/view-with-codesmith-dark-v2.svg"><source media="(prefers-color-scheme: light)" srcset="https://pr-comments-assets.blacksmith.sh/codesmith/view-with-codesmith-light-v2.svg"><img alt="View with Codesmith" src="https://pr-comments-assets.blacksmith.sh/codesmith/view-with-codesmith-dark-v2.svg"></picture></a> <a href="https://backend.blacksmith.sh/track/enable-autofix?expires=1787082043&installation_id=146802194&pr_number=6829&repository=netbirdio%2Fnetbird&return_to=https%3A%2F%2Fgithub.com%2Fnetbirdio%2Fnetbird%2Fpull%2F6829&signature=0b721db25e04e4d7d509a430ba02c9a88f3c1f890a68f20b1aecb806633cfdb9"><picture><source media="(prefers-color-scheme: dark)" srcset="https://pr-comments-assets.blacksmith.sh/codesmith/autofix-with-codesmith-dark.svg"><source media="(prefers-color-scheme: light)" srcset="https://pr-comments-assets.blacksmith.sh/codesmith/autofix-with-codesmith-light.svg"><img alt="Autofix with Codesmith" src="https://pr-comments-assets.blacksmith.sh/codesmith/autofix-with-codesmith-dark.svg"></picture></a> <sup>Need help on this PR? Tag <code>/codesmith</code> with what you need. Autofix is disabled.</sup>    ## Summary by CodeRabbit * **New Features** * Improved lazy connection handling by switching peers to a wake (“idle”) endpoint while preserving configured allowed IPs/routes. * Automatically recreates peers when they’re missing during lazy connection setup. * Idle behavior now retains the existing peer configuration to support faster reconnection. * **Bug Fixes** * Prevents scheduled/queued endpoint updates from applying after a peer becomes idle. * Refined close/idle transitions and cleanup to ensure consistent peer endpoint behavior.

saavagebueno added the pull-request label 2026-08-05 07:08:23 -04:00

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Reference: DYNR/netbird#27220