| From | Luis Henriques <> | Subject | [PATCH 049/118] netfilter: don't reset nf_trace in nf_reset() | Date | Tue, 7 May 2013 14:38:15 +0100 |
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3.5.7.12 -stable review patch. If anyone has any objections, please let me know.
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From: Patrick McHardy <kaber@trash.net>
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 <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net> [ luis: adjust context ] Signed-off-by: Luis Henriques <luis.henriques@canonical.com> --- 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) #endif } +static inline void nf_reset_trace(struct sk_buff *skb) +{ +#if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) + skb->nf_trace = 0; +#endif +} + /* 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; secpath_reset(skb); nf_reset(skb); + nf_reset_trace(skb); return netif_rx(skb); } EXPORT_SYMBOL_GPL(dev_forward_skb); -- 1.8.1.2
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