30278c443a
The rte_pcapng_init function doesn't exist, so remove it from the docs. Also fix minor mistakes in the file. Signed-off-by: Cian Ferriter <cian.ferriter@intel.com> Acked-by: Stephen Hemminger <stephen@networkplumber.org>
45 lines
1.7 KiB
ReStructuredText
45 lines
1.7 KiB
ReStructuredText
.. SPDX-License-Identifier: BSD-3-Clause
|
|
Copyright(c) 2021 Microsoft Corporation
|
|
|
|
Packet Capture Next Generation Library
|
|
======================================
|
|
|
|
Exchanging packet traces becomes more and more critical every day.
|
|
The de facto standard for this is the format defined by libpcap;
|
|
but that format is rather old and is lacking in functionality
|
|
for more modern applications.
|
|
The `Pcapng file format`_ is the default capture file format
|
|
for modern network capture processing tools
|
|
such as `wireshark`_ (can also be read by `tcpdump`_).
|
|
|
|
The Pcapng library is an API for formatting packet data
|
|
into a Pcapng file.
|
|
The format conforms to the current `Pcapng RFC`_ standard.
|
|
It is designed to be integrated with the packet capture library.
|
|
|
|
Usage
|
|
-----
|
|
|
|
The output stream is created with ``rte_pcapng_fdopen``,
|
|
and should be closed with ``rte_pcapng_close``.
|
|
|
|
The library requires a DPDK mempool to allocate mbufs.
|
|
The mbufs need to be able to accommodate additional space
|
|
for the pcapng packet format header and trailer information;
|
|
the function ``rte_pcapng_mbuf_size`` should be used
|
|
to determine the lower bound based on MTU.
|
|
|
|
Collecting packets is done in two parts.
|
|
The function ``rte_pcapng_copy`` is used to format and copy mbuf data
|
|
and ``rte_pcapng_write_packets`` writes a burst of packets to the output file.
|
|
|
|
The function ``rte_pcapng_write_stats`` can be used
|
|
to write statistics information into the output file.
|
|
The summary statistics information is automatically added
|
|
by ``rte_pcapng_close``.
|
|
|
|
.. _Tcpdump: https://tcpdump.org/
|
|
.. _Wireshark: https://wireshark.org/
|
|
.. _Pcapng file format: https://github.com/pcapng/pcapng/
|
|
.. _Pcapng RFC: https://datatracker.ietf.org/doc/html/draft-tuexen-opsawg-pcapng
|