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sk_filter(9) [centos man page]

SK_FILTER(9)							 Linux Networking						      SK_FILTER(9)

sk_filter - run a packet through a socket filter SYNOPSIS
int sk_filter(struct sock * sk, struct sk_buff * skb); ARGUMENTS
sk sock associated with sk_buff skb buffer to filter DESCRIPTION
Run the filter code and then cut skb->data to correct size returned by sk_run_filter. If pkt_len is 0 we toss packet. If skb->len is smaller than pkt_len we keep whole skb->data. This is the socket level wrapper to sk_run_filter. It returns 0 if the packet should be accepted or -EPERM if the packet should be tossed. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 SK_FILTER(9)

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CFG80211_TESTMODE_AL(9) 					     Test mode						   CFG80211_TESTMODE_AL(9)

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 <> Author. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 CFG80211_TESTMODE_AL(9)

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