Firewall Rule Conversion Problem

Sun, 09 Aug 2026 00:00:00 +0000

I was reviewing a teammate’s PR that optimized how we convert user-space firewall rules to another format to program into eBPF dataplane, and it was a nice reminder that DSA isn’t just interview trivia. It shows up in real infra code more often than you’d think. The change was small on the surface, but underneath it swapped a linear scan for a trie and turned a quadratic loop into linear complexity.

Firewall on viveksb007

Firewall Rule Conversion Problem