SKB_SEQ_READ(9) Linux Networking SKB_SEQ_READ(9)NAME
skb_seq_read - Sequentially read skb data
SYNOPSIS
unsigned int skb_seq_read(unsigned int consumed, const u8 ** data, struct skb_seq_state * st);
ARGUMENTS
consumed
number of bytes consumed by the caller so far
data
destination pointer for data to be returned
st
state variable
DESCRIPTION
Reads a block of skb data at consumed relative to the lower offset specified to skb_prepare_seq_read. Assigns the head of the data block to
data and returns the length of the block or 0 if the end of the skb data or the upper offset has been reached.
The caller is not required to consume all of the data returned, i.e. consumed is typically set to the number of bytes already consumed and
the next call to skb_seq_read will return the remaining part of the block.
NOTE 1
The size of each block of data returned can be arbitrary, this limitation is the cost for zerocopy seqeuental reads of potentially non
linear data.
NOTE 2
Fragment lists within fragments are not implemented at the moment, state->root_skb could be replaced with a stack for this purpose.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 SKB_SEQ_READ(9)
Check Out this Related Man Page
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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