Measure network traffic programmatically on iPhone

I'm interested in measuring the network traffic for my application. Ideally I would need to separate wireless from 3G network traffic. I can't seem to find any API that gets this information; however I see that there is at least one app in the AppStore that does something close (they actually sum up the traffic for the entire phone).

Any ideas?

How do I measure network traffic?

The best way to check network traffic is with a tool like SolarWinds® Bandwidth Analyzer Pack (BAP). BAP is built to automatically check and compile network traffic insights from devices across your network in a centralized dashboard and alert you to any concerning behavior in your network.

I've found one approximate solution: getifaddrs can be used to get statistics on network usage.

One advantage is that it can get separate statistics for Wi-Fi and WWAN interfaces.

A disadvantage is that on multi-tasking devices those interfaces may be used by multiple applications and the statistics are cumulated.