netdev - Re: [PATCH v3 bpf-next 2/3] net: netfilter: add bpf_ct_set_nat

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Date:   Fri, 23 Sep 2022 14:34:14 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Lorenzo Bianconi <lorenzo@...nel.org>
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org, ast@...nel.org,
        daniel@...earbox.net, andrii@...nel.org, davem@...emloft.net,
        kuba@...nel.org, edumazet@...gle.com, pabeni@...hat.com,
        pablo@...filter.org, fw@...len.de, netfilter-devel@...r.kernel.org,
        lorenzo.bianconi@...hat.com, brouer@...hat.com, toke@...hat.com,
        memxor@...il.com
Subject: Re: [PATCH v3 bpf-next 2/3] net: netfilter: add bpf_ct_set_nat_info
 kfunc helper

Hi Lorenzo,

On Wed, Sep 21, 2022 at 06:48:26PM +0200, Lorenzo Bianconi wrote:
> Introduce bpf_ct_set_nat_info kfunc helper in order to set source and
> destination nat addresses/ports in a new allocated ct entry not inserted
> in the connection tracking table yet.
> 
> Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>

This commit is now in -next as commit 0fabd2aa199f ("net: netfilter: add
bpf_ct_set_nat_info kfunc helper"). Unfortunately, it introduces a
circular dependency when I build with my distribution's (Arch Linux)
configuration:

$ curl -LSso .config https://github.com/archlinux/svntogit-packages/raw/packages/linux/trunk/config

$ make -skj"$(nproc)" INSTALL_MOD_PATH=rootfs INSTALL_MOD_STRIP=1 olddefconfig all modules_install
...
WARN: multiple IDs found for 'nf_conn': 99333, 114119 - using 99333
WARN: multiple IDs found for 'nf_conn': 99333, 115663 - using 99333
WARN: multiple IDs found for 'nf_conn': 99333, 117330 - using 99333
WARN: multiple IDs found for 'nf_conn': 99333, 119583 - using 99333
depmod: ERROR: Cycle detected: nf_conntrack -> nf_nat -> nf_conntrack
depmod: ERROR: Found 2 modules in dependency cycles!
...

The WARN lines are there before this change but I figured they were
worth including anyways, in case they factor in here.

If there is any more information I can provide or patches I can test,
please let me know!

Cheers,
Nathan