Re: [PATCH V5] netfilter: netns nf_conntrack: per-netns net.netfilter.nf_conntrack_max sysctl

lvxiafei
2025-04-12T17:31:14Z

The limit of other netns cannot be greater than init_net netns.
+----------------+-------------+----------------+
| init_net netns | other netns | limit behavior |
+----------------+-------------+----------------+
| 0 | 0 | unlimited |
+----------------+-------------+----------------+
| 0 | not 0 | other |
+----------------+-------------+----------------+
| not 0 | 0 | init_net |
+----------------+-------------+----------------+
| not 0 | not 0 | min |
+----------------+-------------+----------------+

0,0
[Apr12 17:16] init_net.ct.sysctl_max 0, net->ct.sysctl_max 0, ct_max 0
0,1
[Apr12 17:17] init_net.ct.sysctl_max 0, net->ct.sysctl_max 1, ct_max 1
[ +0.000004] nf_conntrack: nf_conntrack: table full, dropping packet
1,0
Apr12 17:18] init_net.ct.sysctl_max 1, net->ct.sysctl_max 0, ct_max 1
[ +0.000006] nf_conntrack: nf_conntrack: table full, dropping packet
1,2
[Apr12 17:19] init_net.ct.sysctl_max 1, net->ct.sysctl_max 2, ct_max 1
[ +0.000004] nf_conntrack: nf_conntrack: table full, dropping packet
2,1
[Apr12 17:21] init_net.ct.sysctl_max 2, net->ct.sysctl_max 1, ct_max 1
[ +0.000004] nf_conntrack: nf_conntrack: table full, dropping packet