NAME

       otherfns - Other functions

SYNOPSIS

   Modules
       Internal functions

   Functions
       unsigned int pktb_tailroom (struct pkt_buff *pktb)
       uint8_t * pktb_mac_header (struct pkt_buff *pktb)
       uint8_t * pktb_network_header (struct pkt_buff *pktb)
       uint8_t * pktb_transport_header (struct pkt_buff *pktb)

Detailed Description

       The library provides a number of other functions which many user-space programs will never
       need. These divide into 2 groups:

       1.  Functions to get values of members of opaque struct pktbuff, described below

       2.  Internal functions, described in Module Internal functions

Function Documentation

   uint8_t* pktb_mac_header (struct pkt_buff * pktb)
       pktb_mac_header - get address of layer 2 header (if any)

       Parameters
           pktb Pointer to userspace packet buffer

       Returns
           Pointer to MAC header or NULL if no such header present.
           Only packet buffers in family AF_BRIDGE have a non-NULL MAC header.

       Definition at line 233 of file pktbuff.c.

   uint8_t* pktb_network_header (struct pkt_buff * pktb)
       pktb_network_header - get address of layer 3 header

       Parameters
           pktb Pointer to userspace packet buffer

       Returns
           Pointer to layer 3 header or NULL if the packet buffer was created with an unsupported
           family

       Definition at line 245 of file pktbuff.c.

   unsigned int pktb_tailroom (struct pkt_buff * pktb)
       pktb_tailroom - get room available for packet expansion

       Parameters
           pktb Pointer to userspace packet buffer

       Returns
           room in bytes after the tail of the packet buffer
           This starts off as the extra argument to pktb_alloc(). Programmers should ensure this
           extra argument is sufficient for any packet mangle, as packet buffers cannot be
           expanded dynamically.

       Definition at line 220 of file pktbuff.c.

   uint8_t* pktb_transport_header (struct pkt_buff * pktb)
       pktb_transport_header - get address of layer 4 header (if known)

       Parameters
           pktb Pointer to userspace packet buffer

       Returns
           Pointer to layer 4 header or NULL if not (yet) set

       Note
           Unlike the lower-level headers, it is the programmer's responsibility to create the
           level 4 (transport) header pointer by caling e.g. nfq_ip_set_transport_header()

       Definition at line 260 of file pktbuff.c.

Author

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