Hi Hannes:

On 10/8/15 1:25 PM, Hannes Frederic Sowa wrote:
diff --git a/include/net/if_inet6.h b/include/net/if_inet6.h
index 1c8b6820b694..f190a14148ab 100644
--- a/include/net/if_inet6.h
+++ b/include/net/if_inet6.h
@@ -72,6 +72,7 @@ struct inet6_ifaddr {
        int                     regen_count;

        bool                    tokenized;
+       bool                    managed;

IMHO the naming of the bool is a bit too vague. ;) Would you mind
renaming it to something like puuh... user_managed, non_autoconf,
manual_conf etc.?  'managed' seems so often used in the context of
temporary addresses, I first thought about that.

enum { USER_SPACE, KERNEL_AUTOCONF } managed_by;

I have no preference on naming; unless other preferences are stated I'll do v5 with it renamed to 'user_managed'.



@@ -2689,6 +2692,9 @@ static int inet6_addr_add(struct net *net, int ifindex,
                            valid_lft, prefered_lft);

        if (!IS_ERR(ifp)) {
+               if (!expires)
+                       ifp->managed = true;
+

This assumes that user space managed addresses don't time out. This is
in fact not true. I am not sure if it matters a lot, as most addresses
added from user space with a timeout most probably will be added because
of autoconf, but they are not managed by kernel autoconf. Not sure if we
want to make this more explicit, certainly it would avoid surprises.

Not exactly. I'm taking the easy way out and saying only addresses with no expiration time fall into the 'user managed' category and retained on an ifdown. Trying to accommodate lifetimes is a PITA. I mentioned that in the documentation:
  "static global addresses with no expiration time are not flushed"

Thanks for the review,
David
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