netdev - Re: [PATCH V2] sctp: reset flowi4_oif parameter on route lookup

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Date:	Sun, 27 Apr 2014 19:54:33 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	xufeng.zhang@...driver.com
Cc:	vyasevich@...il.com, nhorman@...driver.com, ja@....bg,
	linux-sctp@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH V2] sctp: reset flowi4_oif parameter on route lookup

From: Xufeng Zhang <xufeng.zhang@...driver.com>
Date: Fri, 25 Apr 2014 16:55:41 +0800

> commit 813b3b5db83 (ipv4: Use caller's on-stack flowi as-is
> in output route lookups.) introduces another regression which
> is very similar to the problem of commit e6b45241c (ipv4: reset
> flowi parameters on route connect) wants to fix:
> Before we call ip_route_output_key() in sctp_v4_get_dst() to
> get a dst that matches a bind address as the source address,
> we have already called this function previously and the flowi
> parameters have been initialized including flowi4_oif, so when
> we call this function again, the process in __ip_route_output_key()
> will be different because of the setting of flowi4_oif, and we'll
> get a networking device which corresponds to the inputted flowi4_oif
> as the output device, this is wrong because we'll never hit this
> place if the previously returned source address of dst match one
> of the bound addresses.
> 
> To reproduce this problem, a vlan setting is enough:
>   # ifconfig eth0 up
>   # route del default
>   # vconfig add eth0 2
>   # vconfig add eth0 3
>   # ifconfig eth0.2 10.0.1.14 netmask 255.255.255.0
>   # route add default gw 10.0.1.254 dev eth0.2
>   # ifconfig eth0.3 10.0.0.14 netmask 255.255.255.0
>   # ip rule add from 10.0.0.14 table 4
>   # ip route add table 4 default via 10.0.0.254 src 10.0.0.14 dev eth0.3
>   # sctp_darn -H 10.0.0.14 -P 36422 -h 10.1.4.134 -p 36422 -s -I
> You'll detect that all the flow are routed to eth0.2(10.0.1.254).
> 
> Signed-off-by: Xufeng Zhang <xufeng.zhang@...driver.com>
> Signed-off-by: Julian Anastasov <ja@....bg>

Applied and queued up for -stable.
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