From 124dff01afbdbff251f0385beca84ba1b9adda68 Mon Sep 17 00:00:00 2001 From: Patrick McHardy Date: Fri, 5 Apr 2013 20:42:05 +0200 Subject: [PATCH] netfilter: don't reset nf_trace in nf_reset() 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 --- include/linux/skbuff.h | 4 ++++ net/core/dev.c | 1 + 2 files changed, 5 insertions(+) diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index 72b396751de7..b8292d8cc9fa 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -2641,6 +2641,10 @@ static inline void nf_reset(struct sk_buff *skb) nf_bridge_put(skb->nf_bridge); skb->nf_bridge = NULL; #endif +} + +static inline void nf_reset_trace(struct sk_buff *skb) +{ #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) skb->nf_trace = 0; #endif diff --git a/net/core/dev.c b/net/core/dev.c index 13e6447f0398..e7d68ed8aafe 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -1639,6 +1639,7 @@ 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); -- GitLab