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netlink: return optional metadata with the operation result.
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Authored by melifaro on Jan 30 2023, 6:40 PM.
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Details

Summary

Some operations like interface creation may need to return metadata - in this case, interface name - back to the caller if the operation is successful.

This change implements attaching an NLMSGERR_ATTR_COOKIE nla to the operation reply message via nlmsg_report_cookie().
Additionally, on successful interface creation, interface index and interface name are returned in the IFLA_NEW_IFINDEX and IFLA_IFNAME TLVs, encapsulated in the NLMSGERR_ATTR_COOKIE`.

MFC after: 1 week

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rG FreeBSD src repository
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Build Status
Buildable 49334
Build 46224: arc lint + arc unit

Event Timeline

melifaro added a reviewer: network.
melifaro added a reviewer: manpages.

Fix python code formatting.

Manual page change LGTM. Can't speak to consistency with source code.

This revision is now accepted and ready to land.Jan 31 2023, 6:01 PM
This revision was landed with ongoing or failed builds.Feb 9 2023, 3:30 PM
This revision was automatically updated to reflect the committed changes.