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skb_copy(9) [centos man page]

SKB_COPY(9)							 Linux Networking						       SKB_COPY(9)

NAME
skb_copy - create private copy of an sk_buff SYNOPSIS
struct sk_buff * skb_copy(const struct sk_buff * skb, gfp_t gfp_mask); ARGUMENTS
skb buffer to copy gfp_mask allocation priority DESCRIPTION
Make a copy of both an sk_buff and its data. This is used when the caller wishes to modify the data and needs a private copy of the data to alter. Returns NULL on failure or the pointer to the buffer on success. The returned buffer has a reference count of 1. As by-product this function converts non-linear sk_buff to linear one, so that sk_buff becomes completely private and caller is allowed to modify all the data of returned buffer. This means that this function is not recommended for use in circumstances when only header is going to be modified. Use pskb_copy instead. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 SKB_COPY(9)

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STRUCT 
SK_BUFF(9) Linux Networking STRUCT SK_BUFF(9) NAME
struct_sk_buff - socket buffer SYNOPSIS
struct sk_buff { struct sk_buff * next; struct sk_buff * prev; ktime_t tstamp; struct sock * sk; struct net_device * dev; char cb[48]; unsigned long _skb_dst; #ifdef CONFIG_XFRM struct sec_path * sp; #endif unsigned int len; unsigned int data_len; __u16 mac_len; __u16 hdr_len; union {unnamed_union}; __u16 vlan_tci; sk_buff_data_t transport_header; sk_buff_data_t network_header; sk_buff_data_t mac_header; sk_buff_data_t tail; sk_buff_data_t end; unsigned char * head; unsigned char * data; unsigned int truesize; atomic_t users; }; MEMBERS
next Next buffer in list prev Previous buffer in list tstamp Time we arrived sk Socket we are owned by dev Device we arrived on/are leaving by cb[48] Control buffer. Free for use by every layer. Put private vars here _skb_dst destination entry sp the security path, used for xfrm len Length of actual data data_len Data length mac_len Length of link layer header hdr_len writable header length of cloned skb {unnamed_union} anonymous vlan_tci vlan tag control information transport_header Transport layer header network_header Network layer header mac_header Link layer header tail Tail pointer end End pointer head Head of buffer data Data head pointer truesize Buffer size users User count - see {datagram,tcp}.c COPYRIGHT
Kernel Hackers Manual 2.6. July 2010 STRUCT SK_BUFF(9)
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