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netdev_alloc_skb(9) [centos man page]

NETDEV_ALLOC_SKB(9)						 Linux Networking					       NETDEV_ALLOC_SKB(9)

netdev_alloc_skb - allocate an skbuff for rx on a specific device SYNOPSIS
struct sk_buff * netdev_alloc_skb(struct net_device * dev, unsigned int length); ARGUMENTS
dev network device to receive on length length to allocate DESCRIPTION
Allocate a new sk_buff and assign it a usage count of one. The buffer has unspecified headroom built in. Users should allocate the headroom they think they need without accounting for the built in space. The built in space is used for optimisations. NULL is returned if there is no free memory. Although this function allocates memory it can be called from an interrupt. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 NETDEV_ALLOC_SKB(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 <johannes@sipsolutions.net> Author. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 CFG80211_TESTMODE_AL(9)
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