On Fri, 19 Feb 2021 at 11:49, Eric Dumazet [off-list ref] wrote:

quoted

+     case SO_NETNS_COOKIE:
+             lv = sizeof(u64);
+             if (len < lv)
+                     return -EINVAL;

        if (len != lv)
                return -EINVAL;

(There is no reason to support bigger value before at least hundred years)

Sorry that was copy pasta from SO_COOKIE which uses the same check. I'll
change it to your suggestion. Want me to fix SO_COOKIE as well?

quoted

+#ifdef CONFIG_NET_NS
+             v.val64 = sock_net(sk)->net_cookie;
+#else
+             v.val64 = init_net.net_cookie;
+#endif
+             break;
+

Why using this ugly #ifdef ?

The following should work just fine, even if CONFIG_NET_NS is not set.

v.val64 = sock_net(sk)->net_cookie;

I looked at sock_net and didn't understand how it avoids a compile error
so I didn't use it, thanks for pointing this out.

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