skb_tailroom(9) [centos man page]

SKB_TAILROOM(9) 						 Linux Networking						   SKB_TAILROOM(9)

NAME

       skb_tailroom - bytes at buffer end

SYNOPSIS

       int skb_tailroom(const struct sk_buff * skb);

ARGUMENTS

       skb
	   buffer to check

DESCRIPTION

       Return the number of bytes of free space at the tail of an sk_buff

COPYRIGHT

Kernel Hackers Manual 3.10					     June 2014							   SKB_TAILROOM(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)