.TH "otherfns" 3 "Thu Jan 28 2021" "Version 1.0.5" "libnetfilter_queue" \" -*- nroff -*-
.ad l
.nh
.SH NAME
otherfns \- Other functions
.SH SYNOPSIS
.br
.PP
.SS "Modules"

.in +1c
.ti -1c
.RI "\fBInternal functions\fP"
.br
.in -1c
.SS "Functions"

.in +1c
.ti -1c
.RI "unsigned int \fBpktb_tailroom\fP (struct pkt_buff *pktb)"
.br
.ti -1c
.RI "uint8_t * \fBpktb_mac_header\fP (struct pkt_buff *pktb)"
.br
.ti -1c
.RI "uint8_t * \fBpktb_network_header\fP (struct pkt_buff *pktb)"
.br
.ti -1c
.RI "uint8_t * \fBpktb_transport_header\fP (struct pkt_buff *pktb)"
.br
.in -1c
.SH "Detailed Description"
.PP 
The library provides a number of other functions which many user-space programs will never need\&. These divide into 2 groups: 
.br
.IP "1." 4
Functions to get values of members of opaque \fBstruct pktbuff\fP, described below 
.br

.IP "2." 4
Internal functions, described in Module \fBInternal functions\fP 
.PP

.SH "Function Documentation"
.PP 
.SS "uint8_t* pktb_mac_header (struct pkt_buff * pktb)"
pktb_mac_header - get address of layer 2 header (if any) 
.PP
\fBParameters\fP
.RS 4
\fIpktb\fP Pointer to userspace packet buffer 
.RE
.PP
\fBReturns\fP
.RS 4
Pointer to MAC header or NULL if no such header present\&. 
.br
Only packet buffers in family \fBAF_BRIDGE\fP have a non-NULL MAC header\&. 
.RE
.PP

.PP
Definition at line 233 of file pktbuff\&.c\&.
.SS "uint8_t* pktb_network_header (struct pkt_buff * pktb)"
pktb_network_header - get address of layer 3 header 
.PP
\fBParameters\fP
.RS 4
\fIpktb\fP Pointer to userspace packet buffer 
.RE
.PP
\fBReturns\fP
.RS 4
Pointer to layer 3 header or NULL if the packet buffer was created with an unsupported family 
.RE
.PP

.PP
Definition at line 245 of file pktbuff\&.c\&.
.SS "unsigned int pktb_tailroom (struct pkt_buff * pktb)"
pktb_tailroom - get room available for packet expansion 
.PP
\fBParameters\fP
.RS 4
\fIpktb\fP Pointer to userspace packet buffer 
.RE
.PP
\fBReturns\fP
.RS 4
room in bytes after the tail of the packet buffer 
.br
This starts off as the \fBextra\fP argument to \fBpktb_alloc()\fP\&. Programmers should ensure this \fBextra\fP argument is sufficient for any packet mangle, as packet buffers cannot be expanded dynamically\&. 
.RE
.PP

.PP
Definition at line 220 of file pktbuff\&.c\&.
.SS "uint8_t* pktb_transport_header (struct pkt_buff * pktb)"
pktb_transport_header - get address of layer 4 header (if known) 
.PP
\fBParameters\fP
.RS 4
\fIpktb\fP Pointer to userspace packet buffer 
.RE
.PP
\fBReturns\fP
.RS 4
Pointer to layer 4 header or NULL if not (yet) set 
.RE
.PP
\fBNote\fP
.RS 4
Unlike the lower-level headers, it is the programmer's responsibility to create the level 4 (transport) header pointer by caling e\&.g\&. \fBnfq_ip_set_transport_header()\fP 
.RE
.PP

.PP
Definition at line 260 of file pktbuff\&.c\&.
.SH "Author"
.PP 
Generated automatically by Doxygen for libnetfilter_queue from the source code\&.