queued skbs might be using conntrack extensions that are being removed,
such as timeout. This happens for skbs that have a skb->nfct in
unconfirmed state (i.e., not in hash table yet).
This is destructive, but there are only two use cases:
- module removal (rare)
- netns cleanup (most likely no conntracks exist, and if they do,
they are removed anyway later on).
Signed-off-by: Florian Westphal <fw@xxxxxxxxx>
---
net/netfilter/nf_conntrack_core.c | 4 ++++
net/netfilter/nf_queue.c | 1 +
2 files changed, 5 insertions(+)
diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index c8b87eaa17a2..258077980a93 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -56,6 +56,8 @@
#include <net/netfilter/nf_nat_helper.h>
#include <net/netns/hash.h>
+#include "nf_internals.h"
+
#define NF_CONNTRACK_VERSION "0.5.0"
int (*nfnetlink_parse_nat_setup_hook)(struct nf_conn *ct,
@@ -1695,6 +1697,7 @@ void nf_ct_unconfirmed_destroy(struct net *net)
if (atomic_read(&net->ct.count) > 0) {
__nf_ct_unconfirmed_destroy(net);
+ nf_queue_nf_hook_drop(net);
synchronize_net();
}
}
@@ -1740,6 +1743,7 @@ nf_ct_iterate_destroy(int (*iter)(struct nf_conn *i, void *data), void *data)
if (atomic_read(&net->ct.count) == 0)
continue;
__nf_ct_unconfirmed_destroy(net);
+ nf_queue_nf_hook_drop(net);
}
rtnl_unlock();
diff --git a/net/netfilter/nf_queue.c b/net/netfilter/nf_queue.c
index 043850c9d154..4f4d80a58fb5 100644
--- a/net/netfilter/nf_queue.c
+++ b/net/netfilter/nf_queue.c
@@ -109,6 +109,7 @@ unsigned int nf_queue_nf_hook_drop(struct net *net)
return count;
}
+EXPORT_SYMBOL_GPL(nf_queue_nf_hook_drop);
static int __nf_queue(struct sk_buff *skb, const struct nf_hook_state *state,
struct nf_hook_entry *hook_entry, unsigned int queuenum)
--
2.13.0
--
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