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netfilter: doc: Add nf_tables part in tproxy.txt

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Recently, transparent proxy support has been added to nf_tables so that
this document should be updated with the new information.

- Nft commands are added as alternatives to iptables ones.
- The link for a patched iptables is removed as it is already part of
  the mainline iptables implementation (and the link is dead).
- tcprdr is added as an example implementation of a transparent proxy

Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Florian Westphal <fw@strlen.de>
Cc: KOVACS Krisztian <hidden@sch.bme.hu>
Cc: Pablo Neira Ayuso <pablo@netfilter.org>
Cc: linux-doc@vger.kernel.org
Signed-off-by: Máté Eckl <ecklm94@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Máté Eckl 2018-08-10 12:58:39 +02:00 committed by Pablo Neira Ayuso
parent a148ce1537
commit 1bfc2bc7ad
1 changed files with 27 additions and 7 deletions
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34
Documentation/networking/tproxy.txt
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@ -5,19 +5,28 @@ This feature adds Linux 2.2-like transparent proxy support to current kernels.
To use it, enable the socket match and the TPROXY target in your kernel config.
You will need policy routing too, so be sure to enable that as well.
From Linux 4.18 transparent proxy support is also available in nf_tables.
1. Making non-local sockets work
================================
The idea is that you identify packets with destination address matching a local
socket on your box, set the packet mark to a certain value, and then match on that
value using policy routing to have those packets delivered locally:
socket on your box, set the packet mark to a certain value:
# iptables -t mangle -N DIVERT
# iptables -t mangle -A PREROUTING -p tcp -m socket -j DIVERT
# iptables -t mangle -A DIVERT -j MARK --set-mark 1
# iptables -t mangle -A DIVERT -j ACCEPT
Alternatively you can do this in nft with the following commands:
# nft add table filter
# nft add chain filter divert "{ type filter hook prerouting priority -150; }"
# nft add rule filter divert meta l4proto tcp socket transparent 1 meta mark set 1 accept
And then match on that value using policy routing to have those packets
delivered locally:
# ip rule add fwmark 1 lookup 100
# ip route add local 0.0.0.0/0 dev lo table 100
@ -57,17 +66,28 @@ add rules like this to the iptables ruleset above:
# iptables -t mangle -A PREROUTING -p tcp --dport 80 -j TPROXY \
--tproxy-mark 0x1/0x1 --on-port 50080
Or the following rule to nft:
# nft add rule filter divert tcp dport 80 tproxy to :50080 meta mark set 1 accept
Note that for this to work you'll have to modify the proxy to enable (SOL_IP,
IP_TRANSPARENT) for the listening socket.
As an example implementation, tcprdr is available here:
https://git.breakpoint.cc/cgit/fw/tcprdr.git/
This tool is written by Florian Westphal and it was used for testing during the
nf_tables implementation.
3. Iptables extensions
======================
3. Iptables and nf_tables extensions
====================================
To use tproxy you'll need to have the 'socket' and 'TPROXY' modules
compiled for iptables. A patched version of iptables is available
here: http://git.balabit.hu/?p=bazsi/iptables-tproxy.git
To use tproxy you'll need to have the following modules compiled for iptables:
- NETFILTER_XT_MATCH_SOCKET
- NETFILTER_XT_TARGET_TPROXY
Or the floowing modules for nf_tables:
- NFT_SOCKET
- NFT_TPROXY
4. Application support
======================