datapath/linux/route: Disregard MTU value when deleting routes#41819
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pippolo84 merged 1 commit intocilium:mainfrom Sep 23, 2025
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When Cilium starts in tunnel mode, a route for each remote node pod CIDRs is added to the current node. For these routes, the MTU is set to 1450, to include the tunnel overhead. If the routing mode is then changed to native and Cilium is restarted, the stale routes should be deleted at startup. Unfortunately, this is currently not happening because the MTU is set to 1500 in the deletion request, resulting in the folowing error from netlink: msg="Unable to delete route" ... error="no such process" In other words, the route cannot be found because the MTU value set in the deletion request is not matching the one of the installed route. To solve this, just disregard the MTU value while deleting a route. This should still allow to correctly remove stale IPsec related routes as intended in commit 35ca979 Fixes: 35ca979 ("datapath/linux/route: Fix Delete") Fixes: cilium#41811 Signed-off-by: Fabio Falzoi <fabio.falzoi@isovalent.com>
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Also tested manually for the scenario described in #41811 (restart Cilium to change routing-mode to native) and the one in #40653 (the operator removes pod CIDRs allocated from multi-pool IPAM and the agent removes the stale routes in the IPsec routing tables). In both cases, Cilium is now able to remove the routes correctly. |
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This PR contains the following updates: | Package | Update | Change | |---|---|---| | [cilium](https://cilium.io/) ([source](https://github.com/cilium/cilium)) | patch | `1.18.2` -> `1.18.3` | --- ### Release Notes <details> <summary>cilium/cilium (cilium)</summary> ### [`v1.18.3`](https://github.com/cilium/cilium/releases/tag/v1.18.3): 1.18.3 [Compare Source](cilium/cilium@1.18.2...1.18.3) ## Summary of Changes :information\_source: The images in this release were signed with cosign v3. Please use cosign v3 tooling to validate signatures with the following command syntax: ``` cosign verify --certificate-github-workflow-repository cilium/cilium --certificate-oidc-issuer https://token.actions.githubusercontent.com --certificate-github-workflow-name 'Image Release Build' --certificate-github-workflow-ref refs/tags/v1.18.3 --certificate-identity https://github.com/cilium/cilium/.github/workflows/build-images-releases.yaml@refs/tags/v1.18.3 quay.io/cilium/operator-aws:v1.18.3 | jq -r '.[].critical.image' ``` **Minor Changes:** - Fix a complexity issue for the bpf\_xdp program (Backport PR [#​42198](cilium/cilium#42198), Upstream PR [#​42193](cilium/cilium#42193), [@​aspsk](https://github.com/aspsk)) - hubble: mark kafka l7 visibility as deprecated (Backport PR [#​41968](cilium/cilium#41968), Upstream PR [#​41072](cilium/cilium#41072), [@​kaworu](https://github.com/kaworu)) **Bugfixes:** - add the port name for address based LRP so frontend can pick the right backend (Backport PR [#​41828](cilium/cilium#41828), Upstream PR [#​41602](cilium/cilium#41602), [@​liyihuang](https://github.com/liyihuang)) - Avoid scenario where ENI device configuration can be skipped. (Backport PR [#​41968](cilium/cilium#41968), Upstream PR [#​41760](cilium/cilium#41760), [@​jasonaliyetti](https://github.com/jasonaliyetti)) - Cilium now configures Envoy to allow websocket connections to be passed through with HTTP policies. (Backport PR [#​41828](cilium/cilium#41828), Upstream PR [#​41729](cilium/cilium#41729), [@​jrajahalme](https://github.com/jrajahalme)) - Fix a bug that was preventing Cilium to delete stale pod CIDRs routes when changing routing mode to native (Backport PR [#​41968](cilium/cilium#41968), Upstream PR [#​41819](cilium/cilium#41819), [@​pippolo84](https://github.com/pippolo84)) - Fix a fatal error when accessing multicast map using cilium-dbg bpf multicast (Backport PR [#​42151](cilium/cilium#42151), Upstream PR [#​42080](cilium/cilium#42080), [@​tklauser](https://github.com/tklauser)) - Fix BGP auto discovery not sending community info (Backport PR [#​41968](cilium/cilium#41968), Upstream PR [#​41920](cilium/cilium#41920), [@​jiashengz](https://github.com/jiashengz)) - Fix bug in ENI routing where Cilium would chose the wrong subnet for routing traffic on secondary interfaces (Backport PR [#​41828](cilium/cilium#41828), Upstream PR [#​40860](cilium/cilium#40860), [@​liyihuang](https://github.com/liyihuang)) - Fix bug that could cause ICMP error packets to have an incorrect inner IP checksum when KPR is enabled. (Backport PR [#​41828](cilium/cilium#41828), Upstream PR [#​41551](cilium/cilium#41551), [@​yushoyamaguchi](https://github.com/yushoyamaguchi)) - Fix bug with delegated IPAM where IPv6 traffic was routed via the wrong interface (Backport PR [#​41968](cilium/cilium#41968), Upstream PR [#​41598](cilium/cilium#41598), [@​NihaNallappagari](https://github.com/NihaNallappagari)) - Fix failing node health check on dual stack cluster if NodeInternalIPs are not configured for both families. (Backport PR [#​42055](cilium/cilium#42055), Upstream PR [#​41633](cilium/cilium#41633), [@​Dennor](https://github.com/Dennor)) - Fix increase in memory usage when service names are looked up at high rate during Hubble flow creation (Backport PR [#​42151](cilium/cilium#42151), Upstream PR [#​41965](cilium/cilium#41965), [@​joamaki](https://github.com/joamaki)) - Fix panic at startup in IPsec subsystem with Multi-Pool IPAM mode ([#​41725](cilium/cilium#41725), [@​pippolo84](https://github.com/pippolo84)) - Fix race condition preventing the skiplbmap BPF map from sometimes being pruned after restart. (Backport PR [#​41828](cilium/cilium#41828), Upstream PR [#​41529](cilium/cilium#41529), [@​joamaki](https://github.com/joamaki)) - Fixes a rare bug where endpoints may have incomplete policies in large clusters. (Backport PR [#​42151](cilium/cilium#42151), Upstream PR [#​42049](cilium/cilium#42049), [@​squeed](https://github.com/squeed)) - hostfw: also exclude non-transparent proxy traffic when BPF masq is enabled (Backport PR [#​41989](cilium/cilium#41989), Upstream PR [#​41915](cilium/cilium#41915), [@​julianwiedmann](https://github.com/julianwiedmann)) - Ignore expected error in neighbor reconciliation (Backport PR [#​41968](cilium/cilium#41968), Upstream PR [#​41815](cilium/cilium#41815), [@​dylandreimerink](https://github.com/dylandreimerink)) - loadbalancer: allow HostPort for multiple protos on same port (Backport PR [#​41913](cilium/cilium#41913), Upstream PR [#​41521](cilium/cilium#41521), [@​bersoare](https://github.com/bersoare)) - operator/pkg/lbipam: fix LoadBalancerIPPool conditions update logic (Backport PR [#​41828](cilium/cilium#41828), Upstream PR [#​41322](cilium/cilium#41322), [@​alimehrabikoshki](https://github.com/alimehrabikoshki)) **CI Changes:** - .actions/cilium-config: add missing extraEnv in GH action (Backport PR [#​41828](cilium/cilium#41828), Upstream PR [#​41420](cilium/cilium#41420), [@​aanm](https://github.com/aanm)) - .github/workflows: add variable for renovate bot username (Backport PR [#​41843](cilium/cilium#41843), Upstream PR [#​41818](cilium/cilium#41818), [@​aanm](https://github.com/aanm)) - .github/workflows: automatically add /test for renovate PRs (Backport PR [#​41843](cilium/cilium#41843), Upstream PR [#​41770](cilium/cilium#41770), [@​aanm](https://github.com/aanm)) - .github/workflows: do not wait on linters form forks (Backport PR [#​41828](cilium/cilium#41828), Upstream PR [#​41822](cilium/cilium#41822), [@​aanm](https://github.com/aanm)) - .github/workflows: remove reviewers requested by auto-committer\[bot] (Backport PR [#​41828](cilium/cilium#41828), Upstream PR [#​41759](cilium/cilium#41759), [@​aanm](https://github.com/aanm)) - cli: Fix unreliable tests due to error emitted in Cilium logs "retrieving device lxc\*: Link not found" (Backport PR [#​42200](cilium/cilium#42200), Upstream PR [#​42146](cilium/cilium#42146), [@​fristonio](https://github.com/fristonio)) - gha: Correct k8s version for f12-datapath-service-ns-misc (Backport PR [#​41756](cilium/cilium#41756), Upstream PR [#​41753](cilium/cilium#41753), [@​sayboras](https://github.com/sayboras)) - ginkgo: add test ownership for ginkgo tests (Backport PR [#​42055](cilium/cilium#42055), Upstream PR [#​41950](cilium/cilium#41950), [@​aanm](https://github.com/aanm)) - Streamline ci-multi-pool workflow (Backport PR [#​41631](cilium/cilium#41631), Upstream PR [#​40658](cilium/cilium#40658), [@​pippolo84](https://github.com/pippolo84)) - workflows: fix GCP OIDC authentication's project ID ([#​42173](cilium/cilium#42173), [@​nbusseneau](https://github.com/nbusseneau)) **Misc Changes:** - .github/workflows: stop build CI images until base images are built (Backport PR [#​41828](cilium/cilium#41828), Upstream PR [#​41681](cilium/cilium#41681), [@​aanm](https://github.com/aanm)) - agent: Add Cilium health config cell (Backport PR [#​42055](cilium/cilium#42055), Upstream PR [#​41627](cilium/cilium#41627), [@​aditighag](https://github.com/aditighag)) - bpf/nat: Move `ipv6_nat_entry` to map (Backport PR [#​41968](cilium/cilium#41968), Upstream PR [#​41902](cilium/cilium#41902), [@​pchaigno](https://github.com/pchaigno)) - bpf: hostfw: have from-host always pass the ipcache-based src identity (Backport PR [#​42113](cilium/cilium#42113), Upstream PR [#​42093](cilium/cilium#42093), [@​julianwiedmann](https://github.com/julianwiedmann)) - bpf: Only send fillup signal to agent on ENOMEM error (Backport PR [#​41968](cilium/cilium#41968), Upstream PR [#​41864](cilium/cilium#41864), [@​borkmann](https://github.com/borkmann)) - chore(deps): update all github action dependencies (v1.18) ([#​41795](cilium/cilium#41795), [@​cilium-renovate](https://github.com/cilium-renovate)\[bot]) - chore(deps): update all github action dependencies (v1.18) ([#​41931](cilium/cilium#41931), [@​cilium-renovate](https://github.com/cilium-renovate)\[bot]) - chore(deps): update all github action dependencies (v1.18) ([#​42028](cilium/cilium#42028), [@​cilium-renovate](https://github.com/cilium-renovate)\[bot]) - chore(deps): update all github action dependencies (v1.18) ([#​42136](cilium/cilium#42136), [@​cilium-renovate](https://github.com/cilium-renovate)\[bot]) - chore(deps): update all github action dependencies (v1.18) ([#​42264](cilium/cilium#42264), [@​cilium-renovate](https://github.com/cilium-renovate)\[bot]) - chore(deps): update all-dependencies (v1.18) ([#​41716](cilium/cilium#41716), [@​cilium-renovate](https://github.com/cilium-renovate)\[bot]) - chore(deps): update all-dependencies (v1.18) ([#​41793](cilium/cilium#41793), [@​cilium-renovate](https://github.com/cilium-renovate)\[bot]) - chore(deps): update all-dependencies (v1.18) ([#​42035](cilium/cilium#42035), [@​cilium-renovate](https://github.com/cilium-renovate)\[bot]) - chore(deps): update all-dependencies (v1.18) ([#​42116](cilium/cilium#42116), [@​cilium-renovate](https://github.com/cilium-renovate)\[bot]) - chore(deps): update dependency cilium/little-vm-helper to v0.0.27 (v1.18) ([#​42263](cilium/cilium#42263), [@​cilium-renovate](https://github.com/cilium-renovate)\[bot]) - chore(deps): update dependency protocolbuffers/protobuf to v33 (v1.18) ([#​42265](cilium/cilium#42265), [@​cilium-renovate](https://github.com/cilium-renovate)\[bot]) - chore(deps): update docker.io/library/golang:1.24.7 docker digest to [`2c5f7a0`](cilium/cilium@2c5f7a0) (v1.18) ([#​42026](cilium/cilium#42026), [@​cilium-renovate](https://github.com/cilium-renovate)\[bot]) - chore(deps): update docker.io/library/golang:1.24.7 docker digest to [`87916ac`](cilium/cilium@87916ac) (v1.18) ([#​41792](cilium/cilium#41792), [@​cilium-renovate](https://github.com/cilium-renovate)\[bot]) - chore(deps): update docker.io/library/golang:1.24.9 docker digest to [`02ce1d7`](cilium/cilium@02ce1d7) (v1.18) ([#​42253](cilium/cilium#42253), [@​cilium-renovate](https://github.com/cilium-renovate)\[bot]) - chore(deps): update go to v1.24.8 (v1.18) ([#​42062](cilium/cilium#42062), [@​cilium-renovate](https://github.com/cilium-renovate)\[bot]) - chore(deps): update go to v1.24.9 (v1.18) ([#​42166](cilium/cilium#42166), [@​cilium-renovate](https://github.com/cilium-renovate)\[bot]) - chore(deps): update quay.io/cilium/cilium-envoy docker tag to v1.34.7-1759058812-49b096a457d6e7f6d650229cbf95c63d59759331 (v1.18) ([#​41933](cilium/cilium#41933), [@​cilium-renovate](https://github.com/cilium-renovate)\[bot]) - chore(deps): update stable lvh-images (v1.18) (patch) ([#​41730](cilium/cilium#41730), [@​cilium-renovate](https://github.com/cilium-renovate)\[bot]) - chore(deps): update stable lvh-images (v1.18) (patch) ([#​41794](cilium/cilium#41794), [@​cilium-renovate](https://github.com/cilium-renovate)\[bot]) - chore(deps): update stable lvh-images (v1.18) (patch) ([#​41930](cilium/cilium#41930), [@​cilium-renovate](https://github.com/cilium-renovate)\[bot]) - chore(deps): update stable lvh-images (v1.18) (patch) ([#​42027](cilium/cilium#42027), [@​cilium-renovate](https://github.com/cilium-renovate)\[bot]) - chore(deps): update stable lvh-images (v1.18) (patch) ([#​42135](cilium/cilium#42135), [@​cilium-renovate](https://github.com/cilium-renovate)\[bot]) - chore(deps): update stable lvh-images (v1.18) (patch) ([#​42300](cilium/cilium#42300), [@​cilium-renovate](https://github.com/cilium-renovate)\[bot]) - doc: add note on hostfw and ipsec interaction (Backport PR [#​41968](cilium/cilium#41968), Upstream PR [#​41810](cilium/cilium#41810), [@​darox](https://github.com/darox)) - docs/dsr: Remove IPIP example configuration (Backport PR [#​41828](cilium/cilium#41828), Upstream PR [#​41701](cilium/cilium#41701), [@​pchaigno](https://github.com/pchaigno)) - docs: Clarify list of capabilities in threat model (Backport PR [#​41828](cilium/cilium#41828), Upstream PR [#​41682](cilium/cilium#41682), [@​joestringer](https://github.com/joestringer)) - docs: fix broken Chainguard SBOM link (Backport PR [#​41828](cilium/cilium#41828), Upstream PR [#​41719](cilium/cilium#41719), [@​yashisrani](https://github.com/yashisrani)) - docs: remove stale kernel requirements (Backport PR [#​42151](cilium/cilium#42151), Upstream PR [#​42081](cilium/cilium#42081), [@​julianwiedmann](https://github.com/julianwiedmann)) - docs: Update iproute2 compile steps in reference guide. (Backport PR [#​41828](cilium/cilium#41828), Upstream PR [#​41638](cilium/cilium#41638), [@​dkanaliev](https://github.com/dkanaliev)) - endpoint: reduce missed-policy-update log severity for restoring eps (Backport PR [#​42055](cilium/cilium#42055), Upstream PR [#​41095](cilium/cilium#41095), [@​fristonio](https://github.com/fristonio)) - endpointsynchronizer: suppress warning log when endpoint is terminating (Backport PR [#​41828](cilium/cilium#41828), Upstream PR [#​41755](cilium/cilium#41755), [@​giorio94](https://github.com/giorio94)) - gateway-api: Fix incorrect `Owns` call in refactor (Backport PR [#​41968](cilium/cilium#41968), Upstream PR [#​41807](cilium/cilium#41807), [@​youngnick](https://github.com/youngnick)) - hubble: allow overrrides if building from outside the tree (Backport PR [#​41828](cilium/cilium#41828), Upstream PR [#​41726](cilium/cilium#41726), [@​tklauser](https://github.com/tklauser)) - ipsec: add support for using remote PodCIDR entries (Backport PR [#​42073](cilium/cilium#42073), Upstream PR [#​41519](cilium/cilium#41519), [@​julianwiedmann](https://github.com/julianwiedmann)) - Make kubeProxyReplacement available in the reference and documentation (Backport PR [#​41968](cilium/cilium#41968), Upstream PR [#​41535](cilium/cilium#41535), [@​liyihuang](https://github.com/liyihuang)) - redirectpolicy: Always OpenOrCreate SkipLB map to avoid loader race (Backport PR [#​41968](cilium/cilium#41968), Upstream PR [#​41707](cilium/cilium#41707), [@​joamaki](https://github.com/joamaki)) - redirectpolicy: Fix comparison of BackendParams (Backport PR [#​41848](cilium/cilium#41848), Upstream PR [#​41705](cilium/cilium#41705), [@​joamaki](https://github.com/joamaki)) - Remove kiam documentation from Local Redirect Policy (Backport PR [#​41968](cilium/cilium#41968), Upstream PR [#​41644](cilium/cilium#41644), [@​liyihuang](https://github.com/liyihuang)) - Update `checkpatch` and `startup-script` image digest (Backport PR [#​41828](cilium/cilium#41828), Upstream PR [#​41710](cilium/cilium#41710), [@​HadrienPatte](https://github.com/HadrienPatte)) **Other Changes:** - \[v1.18] gateway-api: Refactor Gateway API reconciler ([#​41720](cilium/cilium#41720), [@​youngnick](https://github.com/youngnick)) - \[v1.18] workflows/release: add secrets for step 4 and 5 ([#​41733](cilium/cilium#41733), [@​jrajahalme](https://github.com/jrajahalme)) - install: Update image digests for v1.18.2 ([#​41722](cilium/cilium#41722), [@​cilium-release-bot](https://github.com/cilium-release-bot)\[bot]) - proxy: Bump cilium-envoy to 1.34.10 ([#​42251](cilium/cilium#42251), [@​sayboras](https://github.com/sayboras)) #### Docker Manifests ##### cilium `quay.io/cilium/cilium:v1.18.3@​sha256:5649db451c88d928ea585514746d50d91e6210801b300c897283ea319d68de15` `quay.io/cilium/cilium:stable@sha256:5649db451c88d928ea585514746d50d91e6210801b300c897283ea319d68de15` ##### clustermesh-apiserver `quay.io/cilium/clustermesh-apiserver:v1.18.3@​sha256:0d15efc992a85003759232598bf05fb1a4cd3c9fa28fb96bee1789ffe27cc50d` `quay.io/cilium/clustermesh-apiserver:stable@sha256:0d15efc992a85003759232598bf05fb1a4cd3c9fa28fb96bee1789ffe27cc50d` ##### docker-plugin `quay.io/cilium/docker-plugin:v1.18.3@​sha256:996d9fa5747175b1806ce01dd90dc586a5f52a32b7da409937a1f42714827d67` `quay.io/cilium/docker-plugin:stable@sha256:996d9fa5747175b1806ce01dd90dc586a5f52a32b7da409937a1f42714827d67` ##### hubble-relay `quay.io/cilium/hubble-relay:v1.18.3@​sha256:e53e00c47fe4ffb9c086bad0c1c77f23cb968be4385881160683d9e15aa34dc3` `quay.io/cilium/hubble-relay:stable@sha256:e53e00c47fe4ffb9c086bad0c1c77f23cb968be4385881160683d9e15aa34dc3` ##### operator-alibabacloud `quay.io/cilium/operator-alibabacloud:v1.18.3@​sha256:df8b6830ef0545199cffc5fb9fbf14c9dc8d92093b0e6355d8659705227f89ef` `quay.io/cilium/operator-alibabacloud:stable@sha256:df8b6830ef0545199cffc5fb9fbf14c9dc8d92093b0e6355d8659705227f89ef` ##### operator-aws `quay.io/cilium/operator-aws:v1.18.3@​sha256:ef39d61183b3bdf0e235650461b6c4d9ec7aa5f61a6c770f33c47a6bc5165e24` `quay.io/cilium/operator-aws:stable@sha256:ef39d61183b3bdf0e235650461b6c4d9ec7aa5f61a6c770f33c47a6bc5165e24` ##### operator-azure `quay.io/cilium/operator-azure:v1.18.3@​sha256:10a8a83ca6f0b02432c1ca0e67af98a48fdbefb684af44a399f58184ab174143` `quay.io/cilium/operator-azure:stable@sha256:10a8a83ca6f0b02432c1ca0e67af98a48fdbefb684af44a399f58184ab174143` ##### operator-generic `quay.io/cilium/operator-generic:v1.18.3@​sha256:b5a0138e1a38e4437c5215257ff4e35373619501f4877dbaf92c89ecfad81797` `quay.io/cilium/operator-generic:stable@sha256:b5a0138e1a38e4437c5215257ff4e35373619501f4877dbaf92c89ecfad81797` ##### operator `quay.io/cilium/operator:v1.18.3@​sha256:e350cea751afeae2f226a1bc275649c77a04a1e1ff50e61d782a371eae6fb2ff` `quay.io/cilium/operator:stable@sha256:e350cea751afeae2f226a1bc275649c77a04a1e1ff50e61d782a371eae6fb2ff` </details> --- ### Configuration 📅 **Schedule**: Branch creation - 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Please merge this manually once you are satisfied. ♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this PR and you won't be reminded about this update again. --- - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box --- This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate). <!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0MS4xNTguMyIsInVwZGF0ZWRJblZlciI6IjQxLjE1OS4zIiwidGFyZ2V0QnJhbmNoIjoibWFzdGVyIiwibGFiZWxzIjpbXX0=--> Reviewed-on: https://kubara.git.onstackit.cloud/STACKIT/kubara/pulls/140
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When Cilium starts in tunnel mode, a route for each remote node pod CIDRs is added to the current node. For these routes, the MTU is set to 1450, to include the tunnel overhead.
If the routing mode is then changed to native and Cilium is restarted, the stale routes should be deleted at startup. Unfortunately, this is currently not happening because the MTU is set to 1500 in the deletion request, resulting in the folowing error from netlink:
msg="Unable to delete route" ... error="no such process"
In other words, the route cannot be found because the MTU value set in the deletion request is not matching the one of the installed route.
To solve this, just disregard the MTU value while deleting a route. This should still allow to correctly remove stale IPsec related routes as intended in commit 35ca979
Fixes: 35ca979 ("datapath/linux/route: Fix Delete")
Fixes: #41811