rule: populate Type field in RuleList and RuleListFiltered

[chent1996]

Summary

• Add Type int field to Rule struct to expose the FIB rule action type (e.g. RTN_UNICAST, RTN_BLACKHOLE, RTN_UNREACHABLE)
• Populate rule.Type from msg.Type during deserialization in RuleListFiltered
• Support setting msg.Type from rule.Type during rule creation in ruleHandle()
• Add RT_FILTER_TYPE filtering support for RuleListFiltered

This follows the same pattern used by Route.Type in route handling.

Fixes #1055

Summary by CodeRabbit

• New Features
  • Rules now support a type attribute.
  • Added filtering capability to exclude rules based on type matching.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: d0c086e0-5021-4808-85d5-5fdf63c8aae4

📥 Commits

Reviewing files that changed from the base of the PR and between 72a8cd7 and a3122c7.

📒 Files selected for processing (2)

• rule.go
• rule_linux.go

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📝 Walkthrough

Walkthrough

The Rule struct gains a new Type field. The rule handling logic is updated to properly serialize this type when creating netlink messages and deserialize it when listing rules. Filter matching now supports type-based filtering.

Changes

Cohort / File(s)	Summary
Rule Struct Definition rule.go	Added exported Type int field to the Rule struct to store rule type information.
Rule Handling and Filtering rule_linux.go	Updated ruleHandle to set netlink message type from rule.Type when populated. Modified RuleListFiltered to deserialize message type into rule.Type and support RT_FILTER_TYPE filter mask for type-based rule filtering.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰 A type now flows through rules so fine,
No longer lost to zeros' line,
Each rule remembers what it's for,
And filters know it to the core! ✨

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[chent1996]

Closing as duplicate of #1096 which provides a more comprehensive fix.