derailed/cilium
Mar 2025 – Sep 2025
2 Months active
Languages Used
C
Technical Skills
BPFKernel DevelopmentNetworkingIPv4Network ProgrammingPacket Processing
yushoyamaguchi
PROFILE
Yushoyamaguchi
Worked on the derailed/cilium repository to enhance network reliability and standards compliance in kernel-level packet processing. Addressed a Geneve-DSR host-routing inconsistency by ensuring incoming packets are correctly delivered to the host stack, improving conntrack accuracy and preventing unintended iptables masquerading when host-routing is disabled. Expanded end-to-end test coverage for both IPv4 and IPv6 to validate these changes and prevent regressions. Additionally, refactored SNAT v4 ICMP error path handling to update the L3 checksum before L4 processing, aligning with RFC requirements and reducing dropped packets. Utilized C, BPF, and kernel development skills to deliver robust, standards-compliant networking solutions.
Overall Statistics
Feature vs Bugs
0%Features
Repository Contributions
2Total
Bugs
2
Commits
2
Features
0
Lines of code
349
Activity Months2
Your Network
134 peopleWork History
September 2025
1 Commits
Sep 1, 2025For 2025-09, delivered RFC-compliant L3 checksum update in SNAT v4 rewrite on ICMP error paths in derailed/cilium. Refactored snat_v4_rewrite_headers to compute the L3 checksum before processing the L4 header so the L3 checksum is updated even if the L4 checksum cannot be recalculated due to truncated inner headers in ICMP error packets, aligning with RFC standards for invalid IP header checksums. This work improves reliability of error-path handling and reduces dropped packets in SNAT v4 flows.
1 Commits
Sep 1, 2025For 2025-09, delivered RFC-compliant L3 checksum update in SNAT v4 rewrite on ICMP error paths in derailed/cilium. Refactored snat_v4_rewrite_headers to compute the L3 checksum before processing the L4 header so the L3 checksum is updated even if the L4 checksum cannot be recalculated due to truncated inner headers in ICMP error packets, aligning with RFC standards for invalid IP header checksums. This work improves reliability of error-path handling and reduces dropped packets in SNAT v4 flows.
September 2025
March 2025
1 Commits
Mar 1, 2025March 2025: Fixed a Geneve-DSR host-routing off inconsistency to ensure reliable packet processing, and expanded test coverage across IPv4/IPv6. This strengthens conntrack accuracy and prevents iptables masquerading when host-routing is disabled, contributing to more robust host-networking behavior.
March 2025
1 Commits
Mar 1, 2025March 2025: Fixed a Geneve-DSR host-routing off inconsistency to ensure reliable packet processing, and expanded test coverage across IPv4/IPv6. This strengthens conntrack accuracy and prevents iptables masquerading when host-routing is disabled, contributing to more robust host-networking behavior.
Activity
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Quality Metrics
Correctness100.0%
Maintainability90.0%
Architecture90.0%
Performance90.0%
AI Usage20.0%
Skills & Technologies
Programming Languages
C
Technical Skills
BPFIPv4Kernel DevelopmentNetwork ProgrammingNetworkingPacket Processing
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