mac80211_hwsim: Allow managing radios from non-initial namespaces
While wiphys can be moved into network namespaces over nl80211, the creation and removal of hwsim radios is currently limited to the initial namespace. This patch allows management of namespaced radios from the owning namespace by setting genetlink netnsok. To prevent two arbitrary namespaces to communicate over the simulated shared medium, radios are separated by netgroups. Each radio created in the same namespace lives in the same netgroup and hence can communicate with other radios in that group. When moving radios to other namespaces, the netgroup is preserved, so two radios having the same netgroup can communicate even if not in the same namespace; This allows a controlling namespace to create radios and move them to other namespaces for communication. When a net namespace owning a radio exits, the radio is destroyed unless it was created in the initial network namespace. This keeps the previous behavior by returning them to the init namespace, but prevents unprivileged users from creating radios in the initial namespace. Signed-off-by: NMartin Willi <martin@strongswan.org> Signed-off-by: NJohannes Berg <johannes.berg@intel.com>
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