derailed/cilium
Mar 2025 – Sep 2025
2 Months active
Languages Used
C
Technical Skills
BPFKernel DevelopmentNetworkingIPv4Network ProgrammingPacket Processing
yushoyamaguchi
PROFILE
Yushoyamaguchi
Yoshihiro Shibata contributed to the derailed/cilium repository by addressing complex networking bugs over a two-month period. He focused on kernel-level packet processing, using C and BPF to resolve a Geneve-DSR host-routing inconsistency that previously led to unreliable connection tracking and unintended iptables masquerading. His approach included expanding end-to-end test coverage for both IPv4 and IPv6, ensuring robust validation and preventing regressions. Additionally, he refactored SNAT v4 error-path handling to update L3 checksums in compliance with RFC standards, even when inner headers were truncated in ICMP error packets. His work demonstrated depth in kernel networking and protocol correctness.
Overall Statistics
Feature vs Bugs
0%Features
Repository Contributions
2Total
Bugs
2
Commits
2
Features
0
Lines of code
349
Activity Months2
Your Network
123 people
Work 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
Loading activity data...
Quality Metrics
Correctness100.0%
Maintainability90.0%
Architecture90.0%
Performance90.0%
AI Usage20.0%
Skills & Technologies
Programming Languages
C
Technical Skills
BPFIPv4Kernel DevelopmentNetwork ProgrammingNetworkingPacket Processing
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline