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| author | Florian Westphal <fw@strlen.de> | 2022-02-02 12:00:56 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-02-16 12:58:31 +0100 |
| commit | 54e302cf55b6f782bd1b85a0e4e0a4f483c40d4c (patch) | |
| tree | 5f6d92e1e7a665abe50290fa5b1b0c239082d2dc /include | |
| parent | c3cef1b1fe34a9ee705a364217bc326c169968a9 (diff) | |
| download | linux-54e302cf55b6f782bd1b85a0e4e0a4f483c40d4c.tar.gz linux-54e302cf55b6f782bd1b85a0e4e0a4f483c40d4c.tar.bz2 linux-54e302cf55b6f782bd1b85a0e4e0a4f483c40d4c.zip | |
netfilter: ctnetlink: disable helper autoassign
[ Upstream commit d1ca60efc53d665cf89ed847a14a510a81770b81 ]
When userspace, e.g. conntrackd, inserts an entry with a specified helper,
its possible that the helper is lost immediately after its added:
ctnetlink_create_conntrack
-> nf_ct_helper_ext_add + assign helper
-> ctnetlink_setup_nat
-> ctnetlink_parse_nat_setup
-> parse_nat_setup -> nfnetlink_parse_nat_setup
-> nf_nat_setup_info
-> nf_conntrack_alter_reply
-> __nf_ct_try_assign_helper
... and __nf_ct_try_assign_helper will zero the helper again.
Set IPS_HELPER bit to bypass auto-assign logic, its unwanted, just like
when helper is assigned via ruleset.
Dropped old 'not strictly necessary' comment, it referred to use of
rcu_assign_pointer() before it got replaced by RCU_INIT_POINTER().
NB: Fixes tag intentionally incorrect, this extends the referenced commit,
but this change won't build without IPS_HELPER introduced there.
Fixes: 6714cf5465d280 ("netfilter: nf_conntrack: fix explicit helper attachment and NAT")
Reported-by: Pham Thanh Tuyen <phamtyn@gmail.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/uapi/linux/netfilter/nf_conntrack_common.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/uapi/linux/netfilter/nf_conntrack_common.h b/include/uapi/linux/netfilter/nf_conntrack_common.h index 4b3395082d15..26071021e986 100644 --- a/include/uapi/linux/netfilter/nf_conntrack_common.h +++ b/include/uapi/linux/netfilter/nf_conntrack_common.h @@ -106,7 +106,7 @@ enum ip_conntrack_status { IPS_NAT_CLASH = IPS_UNTRACKED, #endif - /* Conntrack got a helper explicitly attached via CT target. */ + /* Conntrack got a helper explicitly attached (ruleset, ctnetlink). */ IPS_HELPER_BIT = 13, IPS_HELPER = (1 << IPS_HELPER_BIT), |