netdev - Re: [PATCH] bridge: only provide proxy ARP when CONFIG

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <54B58AAC.7090001@gmail.com>
Date:	Tue, 13 Jan 2015 14:14:20 -0700
From:	David Ahern <dsahern@...il.com>
To:	David Miller <davem@...emloft.net>, cwang@...pensource.com,
	arnd@...db.de
CC:	netdev@...r.kernel.org, kyeyoonp@...eaurora.org,
	bridge@...ts.linux-foundation.org, stephen@...workplumber.org
Subject: Re: [PATCH] bridge: only provide proxy ARP when CONFIG_INET is enabled

On 1/13/15 1:57 PM, David Miller wrote:
> From: Cong Wang <cwang@...pensource.com>
> Date: Tue, 13 Jan 2015 11:25:45 -0800
>
>> On Tue, Jan 13, 2015 at 6:10 AM, Arnd Bergmann <arnd@...db.de> wrote:
>>> When IPV4 support is disabled, we cannot call arp_send from
>>> the bridge code, which would result in a kernel link error:
>>>
>>> net/built-in.o: In function `br_handle_frame_finish':
>>> :(.text+0x59914): undefined reference to `arp_send'
>>> :(.text+0x59a50): undefined reference to `arp_tbl'
>>>
>>> This makes the newly added proxy ARP support in the bridge
>>> code depend on the CONFIG_INET symbol and lets the compiler
>>> optimize the code out to avoid the link error.
>>>
>>
>> Not sure how much sense to make CONFIG_BRIDGE depend
>> on CONFIG_INET, at least CONFIG_BONDING does.
>
> It depends upon whether we want to provide and consider
> as a valid configuration bridging without INET.  Probably
> we do.

Rather than connect CONFIG_BRIDGE to CONFIG_INET, why not make 
br_do_proxy_arp (and setting BR_PROXYARP flag) a no-op if CONFIG_INET is 
not set?

#ifdef CONFIG_INET
#else
static inline void br_do_proxy_arp(...args...)
{
}
#endif

That covers both arp_tbl and arp_send.

David

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html