CFG80211_TESTMODE_AL(9)                     Test mode                     CFG80211_TESTMODE_AL(9)



NAME
       cfg80211_testmode_alloc_reply_skb - allocate testmode reply

SYNOPSIS
       struct sk_buff * cfg80211_testmode_alloc_reply_skb(struct wiphy * wiphy, int approxlen);

ARGUMENTS
       wiphy
           the wiphy

       approxlen
           an upper bound of the length of the data that will be put into the skb

DESCRIPTION
       This function allocates and pre-fills an skb for a reply to the testmode command. Since it
       is intended for a reply, calling it outside of the testmode_cmd operation is invalid.

       The returned skb is pre-filled with the wiphy index and set up in a way that any data that
       is put into the skb (with skb_put, nla_put or similar) will end up being within the
       NL80211_ATTR_TESTDATA attribute, so all that needs to be done with the skb is adding data
       for the corresponding userspace tool which can then read that data out of the testdata
       attribute. You must not modify the skb in any other way.

       When done, call cfg80211_testmode_reply with the skb and return its error code as the
       result of the testmode_cmd operation.

RETURN
       An allocated and pre-filled skb.  NULL if any errors happen.

AUTHOR
       Johannes Berg <johannes AT sipsolutions.net>
           Author.

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                   CFG80211_TESTMODE_AL(9)