Sort of - QSDK uses an old version of OpenWRT and a 3.x Linux Kernel to allow board partners (e.g. Netgear et al) to use their reference designs and spin up a working home router firmware quickly and easily.
An awful lot of devices these days ship with firmware that is actually OpenWRT (often v10-v15) based.
The actual NSS kernel modules have source available, and this is pulled into QSDK OpenWRT builds, but they've not had much luck getting stuff upstreamed[1] and getting them working on a recent 4.x kernel is non trivial.
This was also before the netfilter flow offloading framework, so the work is further compounded because they used their own offloading system.
An awful lot of devices these days ship with firmware that is actually OpenWRT (often v10-v15) based.
The actual NSS kernel modules have source available, and this is pulled into QSDK OpenWRT builds, but they've not had much luck getting stuff upstreamed[1] and getting them working on a recent 4.x kernel is non trivial.
This was also before the netfilter flow offloading framework, so the work is further compounded because they used their own offloading system.
[1] https://lkml.org/lkml/2015/1/8/534