On Mon, Aug 18, 2025 at 11:47:08AM +0800, Yi Chen wrote: > This patch adds a hint when: > > # modprobe nf_conntrack_ftp > # nfct helper del ftp inet tcp > # nfct helper add ftp inet tcp > *nfct v1.4.8: netlink error: File exists* > > or other type of helper. This patch changes EEXIST by EBUSY: https://patchwork.ozlabs.org/project/netfilter-devel/patch/20250818112220.26641-1-phil@xxxxxx/ This userspace patch is not very useful after this. So maybe a follow up fix to retain EEXIST for nfnetlink_cthelper in the kernel is needed? I mean, return EEXIST in nfnetlink_cthelper but EBUSY in case of insmod, ie. add a bool insmod flag to the helper register/unregister functions to return EBUSY for insmod and EEXIST for nfnetlink_cthelper.
