SKB_TRIM(9) Linux Networking SKB_TRIM(9)NAME
skb_trim - remove end from a buffer
SYNOPSIS
void skb_trim(struct sk_buff * skb, unsigned int len);
ARGUMENTS
skb
buffer to alter
len
new length
DESCRIPTION
Cut the length of a buffer down by removing data from the tail. If the buffer is already under the length specified it is not modified. The
skb must be linear.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 SKB_TRIM(9)
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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@sipsolutions.net>
Author.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 CFG80211_TESTMODE_AL(9)
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