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doc: remove out of date links and info from packet mmap

Browse source 
The packet_mmap documentation had links to no longer existing web
sites; replace with other site which has similar example.

Support for packet mmap has been in mainline versions of libpcap
for several years.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stephen Hemminger 2018-03-13 12:24:19 -07:00 committed by David S. Miller
parent ce3db6aade
commit 2b221d20db
1 changed files with 5 additions and 17 deletions
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22
Documentation/networking/packet_mmap.txt
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@ -7,15 +7,12 @@ socket interface on 2.4/2.6/3.x kernels. This type of sockets is used for
i) capture network traffic with utilities like tcpdump, ii) transmit network
traffic, or any other that needs raw access to network interface.
You can find the latest version of this document at:
http://wiki.ipxwarzone.com/index.php5?title=Linux_packet_mmap
Howto can be found at:
http://wiki.gnu-log.net (packet_mmap)
https://sites.google.com/site/packetmmap/
Please send your comments to
Ulisses Alonso Camaró <uaca@i.hate.spam.alumni.uv.es>
Johann Baudy <johann.baudy@gnu-log.net>
Johann Baudy
-------------------------------------------------------------------------------
+ Why use PACKET_MMAP
@ -51,17 +48,8 @@ From the user standpoint, you should use the higher level libpcap library, which
is a de facto standard, portable across nearly all operating systems
including Win32.
Said that, at time of this writing, official libpcap 0.8.1 is out and doesn't include
support for PACKET_MMAP, and also probably the libpcap included in your distribution.
I'm aware of two implementations of PACKET_MMAP in libpcap:
http://wiki.ipxwarzone.com/ (by Simon Patarin, based on libpcap 0.6.2)
http://public.lanl.gov/cpw/ (by Phil Wood, based on lastest libpcap)
The rest of this document is intended for people who want to understand
the low level details or want to improve libpcap by including PACKET_MMAP
support.
Packet MMAP support was integrated into libpcap around the time of version 1.3.0;
TPACKET_V3 support was added in version 1.5.0
--------------------------------------------------------------------------------
+ How to use mmap() directly to improve capture process
@ -174,7 +162,7 @@ As capture, each frame contains two parts:
/* bind socket to eth0 */
bind(this->socket, (struct sockaddr *)&my_addr, sizeof(struct sockaddr_ll));
A complete tutorial is available at: http://wiki.gnu-log.net/
A complete tutorial is available at: https://sites.google.com/site/packetmmap/
By default, the user should put data at :
frame base + TPACKET_HDRLEN - sizeof(struct sockaddr_ll)