Patchwork [049/118] netfilter: don't reset nf_trace in nf_reset()

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Submitter Luis Henriques
Date May 7, 2013, 1:38 p.m.
Message ID <>
Download mbox | patch
Permalink /patch/242225/
State New
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Luis Henriques - May 7, 2013, 1:38 p.m. -stable review patch.  If anyone has any objections, please let me know.


From: Patrick McHardy <>

commit 124dff01afbdbff251f0385beca84ba1b9adda68 upstream.

Commit 130549fe ("netfilter: reset nf_trace in nf_reset") added code
to reset nf_trace in nf_reset(). This is wrong and unnecessary.

nf_reset() is used in the following cases:

- when passing packets up the the socket layer, at which point we want to
  release all netfilter references that might keep modules pinned while
  the packet is queued. nf_trace doesn't matter anymore at this point.

- when encapsulating or decapsulating IPsec packets. We want to continue
  tracing these packets after IPsec processing.

- when passing packets through virtual network devices. Only devices on
  that encapsulate in IPv4/v6 matter since otherwise nf_trace is not
  used anymore. Its not entirely clear whether those packets should
  be traced after that, however we've always done that.

- when passing packets through virtual network devices that make the
  packet cross network namespace boundaries. This is the only cases
  where we clearly want to reset nf_trace and is also what the
  original patch intended to fix.

Add a new function nf_reset_trace() and use it in dev_forward_skb() to
fix this properly.

Signed-off-by: Patrick McHardy <>
Signed-off-by: David S. Miller <>
[ luis: adjust context ]
Signed-off-by: Luis Henriques <>
 include/linux/skbuff.h | 7 +++++++
 net/core/dev.c         | 1 +
 2 files changed, 8 insertions(+)


diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 5af4bef..e1c1e64 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -2404,6 +2404,13 @@  static inline void nf_reset(struct sk_buff *skb)
+static inline void nf_reset_trace(struct sk_buff *skb)
+	skb->nf_trace = 0;
 /* Note: This doesn't put any conntrack and bridge info in dst. */
 static inline void __nf_copy(struct sk_buff *dst, const struct sk_buff *src)
diff --git a/net/core/dev.c b/net/core/dev.c
index 845a83a..196bc5f 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1627,6 +1627,7 @@  int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
 	skb->mark = 0;
+	nf_reset_trace(skb);
 	return netif_rx(skb);