As we approach the v1.3 pre-release feature freeze, I've been thinking a little bit about nice things to have. One thing I found useful in both BracketQoS and Preseem was the ability to grab a list of IP addresses that had been through the shaper, but weren't mapped to a queue (obviously, only from within the "allowed IP" range - we're not trying to map the Internet!).
In Preseem, there's a link to download a CSV file containing all the unmapped IP addresses and how much traffic they have consumed. BracketQoS (pre cpumap-pping) has a report showing the IPs (no traffic).
*Why is this useful?*
Knowing which local IP addresses were processed but not mapped lets you find:
* the times that a device was installed, but the on-boarding process wasn't completed. Yes, that shouldn't happen. And - unfortunately - it occasionally does. If you're using RADIUS-based authentication, it's really difficult for this to happen - but not everyone is.
* If there's a bug in your shaper integration, it's helpful to see "oops, I put X on the default"
* Just occasionally, you get a customer who needs a special setup; it's helpful to see that it worked.
*Current Status*
Before cpumap-pping, Bracket was grabbing them by reading the pping output and listing addresses that didn't match a shaping rule. That doesn't work now:
* xdp_pping is spitting out TC handles, rather than IP addresses.
* With a default rule in place, and handling for IPv6 and IPv4 subnets, an IP address might not exactly match an entry (requires an LPM trie lookup) - and IPs matching a default rule (::/0 or
0.0.0.0/0) will always come back with the "default" handle.
It's currently pretty tricky to do.
So I'm curious; would others like to see this? I have a few ideas for how to make it work, but don't want to start serious planning/design if I'm the only one who wants the feature.