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📝 WalkthroughWalkthroughThe change adds ChangesRule subscription
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟡 Moderate · up to The new rule subscription and decoding behavior still has unresolved cancellation, resource-lifecycle, and data-decoding defects. Valid policy-routing rules can crash consumers or report incorrect values, so these issues should be addressed before merge. Sequence Diagram(s)sequenceDiagram
participant Caller
participant RuleSubscribeWithOptions
participant Netlink
participant UpdateChannel
Caller->>RuleSubscribeWithOptions: provide subscription options
RuleSubscribeWithOptions->>Netlink: subscribe to IPv4 and IPv6 rule groups
RuleSubscribeWithOptions->>Netlink: request existing rules when enabled
Netlink-->>RuleSubscribeWithOptions: deliver rule messages
RuleSubscribeWithOptions->>UpdateChannel: send decoded RuleUpdate
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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cheina97
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Inline comments:
In `@rule_linux.go`:
- Line 385: Update the RuleUpdate delivery send in the receive goroutine to
select between sending on ch and receiving from done, returning promptly when
done closes. Ensure the goroutine can continue its existing cleanup and
channel-close behavior without blocking on an unsubscribed consumer.
- Around line 344-345: Update the initial dump send error path in ListExisting
to close the socket s before returning the Send error, including when done is
nil; preserve the existing successful subscription cleanup behavior.
- Around line 244-248: Update deserializeRule to copy the netlink header’s
msg.Family into the newly created Rule’s Family field, preserving the correct
IPv4 or IPv6 family even when no address selector is present.
In `@rule_test.go`:
- Around line 491-495: Update both test locations in rule_test.go (lines 491-495
and 535-539) to lock the current OS thread, capture the original namespace with
netns.Get(), and restore it using netns.Set(origNs) before unlocking. Apply the
same cleanup sequence around each netns.New() call, while preserving existing
error handling and test behavior.
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cheina97
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September 2, 2026 22:16
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Actionable comments posted: 3
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Inline comments:
In `@cmd/rulesubscribe/main.go`:
- Line 58: Update both os.Exit(1) sites in cmd/rulesubscribe/main.go at lines 58
and 91 to clean up the named network namespace before exiting, or route both
subscription-error paths through a return path that allows the deferred
netns.DeleteNamed cleanup to run.
In `@rule_linux.go`:
- Around line 394-399: Update the socket-option setup around SetReceiveTimeout
and SetReceiveBufferSize so every error return closes s before returning the
error. Preserve the existing successful setup flow and ensure cleanup occurs
before the done watcher is started.
In `@scripts/test_rule_add_del_update.sh`:
- Around line 57-59: Add an EXIT cleanup trap in
scripts/test_rule_add_del_update.sh that removes only the three test rules
created by the rule-add commands, including both IPv4 and IPv6 entries with
their fixed priorities. Ensure cleanup runs when set -e causes an early exit
without affecting unrelated rules.
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Inline comments:
In `@rule_test.go`:
- Line 682: Update expectRuleUpdate to receive update, ok from ch and return
false when the channel closes, avoiding rejection of a zero RuleUpdate and an
infinite loop. Create the timeout timer once before the loop so unrelated
updates cannot extend the overall wait duration.
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Inline comments:
In `@route_linux.go`:
- Line 960: The empty-destination fallback in the route handling logic must
provide a 4-byte IPv4 value for the Linux RTA_DST payload. Update the dstData
assignment using net.IPv4zero to convert it with To4() or use an equivalent
4-byte zero slice, while leaving the surrounding FAMILY_V4 handling unchanged.
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Inline comments:
In `@rule_linux.go`:
- Around line 321-322: Update the FRA_IP_PROTO handling in the rule decoding
switch to read the first payload byte directly and convert it to int, replacing
the four-byte native.Uint32 slice access while preserving the existing
rule.IPProto assignment.
- Around line 299-300: Update the FRA_TUN_ID handling in the rule attribute
parsing switch to decode the 64-bit value with networkOrder.Uint64 instead of
native.Uint64, preserving the kernel-provided tunnel ID across host endianness.
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This change adds the ability to subscribe to netlink rule (policy routing) change events, mirroring the existing
RouteSubscribeAPI.What's new
Public API
RuleSubscribe(ch chan<- RuleUpdate, done <-chan struct{}) errorRuleSubscribeAt(ns netns.NsHandle, ch chan<- RuleUpdate, done <-chan struct{}) errorRuleSubscribeWithOptions(ch chan<- RuleUpdate, done <-chan struct{}, options RuleSubscribeOptions) errortype RuleSubscribeOptions structtype RuleUpdate structThe API and behavior are intentionally aligned with
RouteSubscribe:RTNLGRP_IPV4_RULEandRTNLGRP_IPV6_RULEmulticast groups.RTM_NEWRULE/RTM_DELRULEupdates on the provided channel.ListExisting.donechannel is closed.Internal changes
deserializeRulefrom the inline parsing inRuleListFilteredso the same decoding logic is reused for both dump results and live subscription messages.Summary by CodeRabbit
New Features
Bug Fixes