diff mbox series

[net-next,1/6] net: netfilter: use kfree_drop_reason() for NF_DROP

Message ID 20220124131538.1453657-2-imagedong@tencent.com
State Handled Elsewhere
Delegated to: Pablo Neira
Headers show
Series net: use kfree_skb_reason() for ip/udp packet receive | expand

Commit Message

Menglong Dong Jan. 24, 2022, 1:15 p.m. UTC 
From: Menglong Dong <imagedong@tencent.com>

Replace kfree_skb() with kfree_skb_reason() in nf_hook_slow() when
skb is dropped by reason of NF_DROP.

Signed-off-by: Menglong Dong <imagedong@tencent.com>
---
 include/linux/skbuff.h     | 1 +
 include/trace/events/skb.h | 1 +
 net/netfilter/core.c       | 3 ++-
 3 files changed, 4 insertions(+), 1 deletion(-)

Comments

Jakub Kicinski Jan. 25, 2022, 11:32 p.m. UTC | #1 
On Mon, 24 Jan 2022 21:15:33 +0800 menglong8.dong@gmail.com wrote:
> From: Menglong Dong <imagedong@tencent.com>
> 
> Replace kfree_skb() with kfree_skb_reason() in nf_hook_slow() when
> skb is dropped by reason of NF_DROP.

Netfilter folks, does this look good enough to you?

Do you prefer to take the netfilter changes via your tree? I'm asking
because enum skb_drop_reason is probably going to be pretty hot so if
the patch is simple enough maybe no point dealing with merge conflicts.
Pablo Neira Ayuso Jan. 26, 2022, 12:51 a.m. UTC | #2 
On Tue, Jan 25, 2022 at 03:32:14PM -0800, Jakub Kicinski wrote:
> On Mon, 24 Jan 2022 21:15:33 +0800 menglong8.dong@gmail.com wrote:
> > From: Menglong Dong <imagedong@tencent.com>
> > 
> > Replace kfree_skb() with kfree_skb_reason() in nf_hook_slow() when
> > skb is dropped by reason of NF_DROP.
> 
> Netfilter folks, does this look good enough to you?
> 
> Do you prefer to take the netfilter changes via your tree? I'm asking
> because enum skb_drop_reason is probably going to be pretty hot so if
> the patch is simple enough maybe no point dealing with merge conflicts.

I also think it's easier if you take it through net.git.

Thanks for asking.
diff mbox series

Patch

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index bf11e1fbd69b..1bcd690b8ae1 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -320,6 +320,7 @@  enum skb_drop_reason {
 	SKB_DROP_REASON_TCP_CSUM,
 	SKB_DROP_REASON_TCP_FILTER,
 	SKB_DROP_REASON_UDP_CSUM,
+	SKB_DROP_REASON_NETFILTER_DROP,
 	SKB_DROP_REASON_MAX,
 };
 
diff --git a/include/trace/events/skb.h b/include/trace/events/skb.h
index 3e042ca2cedb..beed7bb2bc0e 100644
--- a/include/trace/events/skb.h
+++ b/include/trace/events/skb.h
@@ -16,6 +16,7 @@ 
 	EM(SKB_DROP_REASON_TCP_CSUM, TCP_CSUM)			\
 	EM(SKB_DROP_REASON_TCP_FILTER, TCP_FILTER)		\
 	EM(SKB_DROP_REASON_UDP_CSUM, UDP_CSUM)			\
+	EM(SKB_DROP_REASON_NETFILTER_DROP, NETFILTER_DROP)	\
 	EMe(SKB_DROP_REASON_MAX, MAX)
 
 #undef EM
diff --git a/net/netfilter/core.c b/net/netfilter/core.c
index 354cb472f386..d1c9dfbb11fa 100644
--- a/net/netfilter/core.c
+++ b/net/netfilter/core.c
@@ -621,7 +621,8 @@  int nf_hook_slow(struct sk_buff *skb, struct nf_hook_state *state,
 		case NF_ACCEPT:
 			break;
 		case NF_DROP:
-			kfree_skb(skb);
+			kfree_skb_reason(skb,
+					 SKB_DROP_REASON_NETFILTER_DROP);
 			ret = NF_DROP_GETERR(verdict);
 			if (ret == 0)
 				ret = -EPERM;