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Test Your Knowledge in Computers #949
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In computer security, term virus and malware refer to the exact same thing.
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skb_trim(9) [centos man page]

SKB_TRIM(9)							 Linux Networking						       SKB_TRIM(9)

NAME
skb_trim - remove end from a buffer SYNOPSIS
void skb_trim(struct sk_buff * skb, unsigned int len); ARGUMENTS
skb buffer to alter len new length DESCRIPTION
Cut the length of a buffer down by removing data from the tail. If the buffer is already under the length specified it is not modified. The skb must be linear. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 SKB_TRIM(9)

Check Out this Related Man Page

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)

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