linux-kernel - Re: [PATCH 1/4] netfilter: nfnetlink_log: use proper helper for fetching physinif

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Date: Wed, 10 Jan 2024 21:48:15 +0800
From: Pavel Tikhomirov <ptikhomirov@...tuozzo.com>
To: Florian Westphal <fw@...len.de>
Cc: "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, kernel@...nvz.org
Subject: Re: [PATCH 1/4] netfilter: nfnetlink_log: use proper helper for
 fetching physinif



On 10/01/2024 21:33, Florian Westphal wrote:
> Pavel Tikhomirov <ptikhomirov@...tuozzo.com> wrote:
>> We don't use physindev in __build_packet_message except for getting
>> physinif from it. So let's switch to nf_bridge_get_physinif to get what
>> we want directly.
>>
>> Signed-off-by: Pavel Tikhomirov <ptikhomirov@...tuozzo.com>
>> ---
>>   net/netfilter/nfnetlink_log.c | 8 ++++----
>>   1 file changed, 4 insertions(+), 4 deletions(-)
>>
>> diff --git a/net/netfilter/nfnetlink_log.c b/net/netfilter/nfnetlink_log.c
>> index f03f4d4d7d889..134e05d31061e 100644
>> --- a/net/netfilter/nfnetlink_log.c
>> +++ b/net/netfilter/nfnetlink_log.c
>> @@ -508,7 +508,7 @@ __build_packet_message(struct nfnl_log_net *log,
>>   					 htonl(br_port_get_rcu(indev)->br->dev->ifindex)))
>>   				goto nla_put_failure;
>>   		} else {
>> -			struct net_device *physindev;
>> +			int physinif;
>>   
>>   			/* Case 2: indev is bridge group, we need to look for
>>   			 * physical device (when called from ipv4) */
>> @@ -516,10 +516,10 @@ __build_packet_message(struct nfnl_log_net *log,
>>   					 htonl(indev->ifindex)))
>>   				goto nla_put_failure;
>>   
>> -			physindev = nf_bridge_get_physindev(skb);
>> -			if (physindev &&
>> +			physinif = nf_bridge_get_physinif(skb);
>> +			if (physinif &&
>>   			    nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSINDEV,
>> -					 htonl(physindev->ifindex)))
>> +					 htonl(physinif)))
> 
> I think you can drop this patch and make the last patch pass
> nf_bridge_info->physinif directly.

The whole Idea of this patch was to replace nf_bridge_get_physindev with 
nf_bridge_get_physinif before the patch which propagates net, so that we 
don't need to propagate net first and then in later patch remove it when 
replacing with nf_bridge_get_physinif.

But I spoiled it by forgetting to remove net propagation to 
__build_packet_message...

Is it ok if I leave this patch as is, but instead remove:

diff --git a/net/netfilter/nfnetlink_log.c b/net/netfilter/nfnetlink_log.c
index 134e05d31061e..ad93dd77e6071 100644
--- a/net/netfilter/nfnetlink_log.c
+++ b/net/netfilter/nfnetlink_log.c
@@ -463,7 +463,8 @@ __build_packet_message(struct nfnl_log_net *log,
                         const struct net_device *outdev,
                         const char *prefix, unsigned int plen,
                         const struct nfnl_ct_hook *nfnl_ct,
-                       struct nf_conn *ct, enum ip_conntrack_info ctinfo)
+                       struct nf_conn *ct, enum ip_conntrack_info ctinfo,
+                       struct net *net)
  {
         struct nfulnl_msg_packet_hdr pmsg;
         struct nlmsghdr *nlh;
@@ -804,7 +805,7 @@ nfulnl_log_packet(struct net *net,

         __build_packet_message(log, inst, skb, data_len, pf,
                                 hooknum, in, out, prefix, plen,
-                               nfnl_ct, ct, ctinfo);
+                               nfnl_ct, ct, ctinfo, net);

         if (inst->qlen >= qthreshold)
                 __nfulnl_flush(inst);

from third patch?

-- 
Best regards, Tikhomirov Pavel
Senior Software Developer, Virtuozzo.