skb_partial_csum_set(9) [suse man page]
SKB_PARTIAL_CSUM_SET(9) Linux Networking SKB_PARTIAL_CSUM_SET(9) NAME
skb_partial_csum_set - set up and verify partial csum values for packet SYNOPSIS
bool skb_partial_csum_set(struct sk_buff * skb, u16 start, u16 off); ARGUMENTS
skb the skb to set start the number of bytes after skb->data to start checksumming. off the offset from start to place the checksum. DESCRIPTION
For untrusted partially-checksummed packets, we need to make sure the values for skb->csum_start and skb->csum_offset are valid so we don't oops. This function checks and sets those values and skb->ip_summed: if this returns false you should drop the packet. COPYRIGHT
Kernel Hackers Manual 2.6. July 2010 SKB_PARTIAL_CSUM_SET(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)