skb_put(9) [centos man page]

SKB_PUT(9)							 Linux Networking							SKB_PUT(9)

NAME

       skb_put - add data to a buffer

SYNOPSIS

       unsigned char * skb_put(struct sk_buff * skb, unsigned int len);

ARGUMENTS

       skb
	   buffer to use

       len
	   amount of data to add

DESCRIPTION

       This function extends the used data area of the buffer. If this would exceed the total buffer size the kernel will panic. A pointer to the
       first byte of the extra data is returned.

COPYRIGHT

Kernel Hackers Manual 3.10					     June 2014								SKB_PUT(9)

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_refdst;
       #ifdef CONFIG_XFRM
	 struct sec_path * sp;
       #endif
	 unsigned int len;
	 unsigned int data_len;
	 __u16 mac_len;
	 __u16 hdr_len;
	 union {unnamed_union};
	 __be16 inner_protocol;
	 __u16 inner_transport_header;
	 __u16 inner_network_header;
	 __u16 inner_mac_header;
	 __u16 transport_header;
	 __u16 network_header;
	 __u16 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_refdst
	   destination entry (with norefcount bit)

       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

       inner_protocol
	   Protocol (encapsulation)

       inner_transport_header
	   Inner transport layer header (encapsulation)

       inner_network_header
	   Network layer header (encapsulation)

       inner_mac_header
	   Link layer header (encapsulation)

       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 3.10					     June 2014							 STRUCT SK_BUFF(9)