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From: David Ahern <dsahern@gmail.com>
To: Cong Wang <xiyou.wangcong@gmail.com>, netdev@vger.kernel.org
Cc: Julian Anastasov <ja@ssi.bg>
Subject: Re: [Patch net] fib: relax source validation check for loopback packets
Date: Sat, 13 Jul 2019 18:29:17 -0600
Message-ID: <128233e2-aa2c-d2a0-6249-68fd927a299f@gmail.com> (raw)
In-Reply-To: <8355af23-100f-a3bb-0759-fca8b0aa583b@gmail.com>

On 7/13/19 4:42 PM, David Ahern wrote:
> On 7/12/19 2:17 PM, Cong Wang wrote:
>> diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
>> index 317339cd7f03..8662a44a28f9 100644
>> --- a/net/ipv4/fib_frontend.c
>> +++ b/net/ipv4/fib_frontend.c
>> @@ -388,6 +388,12 @@ static int __fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
>>  	fib_combine_itag(itag, &res);
>>  
>>  	dev_match = fib_info_nh_uses_dev(res.fi, dev);
>> +	/* This is rare, loopback packets retain skb_dst so normally they
>> +	 * would not even hit this slow path.
>> +	 */
>> +	dev_match = dev_match || (res.type == RTN_LOCAL &&
>> +				  dev == net->loopback_dev &&
> 
> The dev should not be needed. res.type == RTN_LOCAL should be enough, no?
> 

nevermind, I see why you have the dev check.

  reply index

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-12 20:17 Cong Wang
2019-07-13 22:42 ` David Ahern
2019-07-14  0:29   ` David Ahern [this message]
2019-07-14  6:30   ` Cong Wang
2019-07-14  6:33     ` Cong Wang

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