netdev - netdev: fwmarks questions

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Date:	Thu, 10 Nov 2011 20:12:56 +0100
From:	Toerless Eckert <Toerless.Eckert@...ormatik.Uni-Erlangen.de>
To:	netdev@...r.kernel.org
Subject: netdev: fwmarks questions

[ Sorry if this is the wron mailing list. Please let me know if so, and
  recommend a better list for these questions]

a) What APIs exist to set fwmarks for sockets. SO far i could only find:
   setsockopt(,SO_MARK,). But is there for example any system call to
   set the fwmark for all sockets of a process - and which is inherited
   across forks ? If not that, then anything else ?

b) Assume i have two physical ethernet interfaces,
   eth0 ip-address 10.1.1.1/24
   eth1 ip-address 10.10.10.1/24

   I do create a new routing table foobar. I populate it only with routes
   for eth1 (eg: interface route and maybe default route).

   ip route add 10.10.10.0/24 eth1 src 10.10.10.1  table foobar
   ip route add default via 10.10.10.254           table vvlan

   I do map this routing table to some fwmark 1234 via eg:

   ip rule add fwmark 1234 table foobar

   Now i have an app with a socket like this:

     s = socket( ...ipv4...)
     setsockopt(s, ... SO_MARK, 1234)
     listen(s, 10)

   Question: Would s also accept incoming connections that came in over
   eth0, eg: to eth0, 10.1.1.1 ?

   Logically i think the socket should not accept such connections, but
   only those to eth1, or whatever else i have in my routing table foobar,
   but i have found no documentation that explains how listen() actually
   works when you use fwmarks.

Cheers
    Toerless
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