linux-next: build failure after merge of the net-next tree

Hi all,

After merging the net-next tree, today's linux-next build (arm
multi_v7_defconfig) failed like this:

net/ipv4/fib_frontend.c: In function 'fib_validate_source':
net/ipv4/fib_frontend.c:411:16: error: 'struct netns_ipv4' has no member named 'fib_has_custom_local_routes'
   if (net->ipv4.fib_has_custom_local_routes)
                ^
net/ipv4/fib_frontend.c: In function 'inet_rtm_newroute':
net/ipv4/fib_frontend.c:773:12: error: 'struct netns_ipv4' has no member named 'fib_has_custom_local_routes'
   net->ipv4.fib_has_custom_local_routes = true;
            ^

Caused by commit

  6e617de84e87 ("net: avoid a full fib lookup when rp_filter is disabled.")

This build has CONFIG_IP_MULTIPLE_TABLES unset.

I have reverted that commit for today.

-- 
Cheers,
Stephen Rothwell

From: Stephen Rothwell <redacted>
Date: Fri, 22 Sep 2017 11:03:55 +1000

After merging the net-next tree, today's linux-next build (arm
multi_v7_defconfig) failed like this:

net/ipv4/fib_frontend.c: In function 'fib_validate_source':
net/ipv4/fib_frontend.c:411:16: error: 'struct netns_ipv4' has no member named 'fib_has_custom_local_routes'
   if (net->ipv4.fib_has_custom_local_routes)
                ^
net/ipv4/fib_frontend.c: In function 'inet_rtm_newroute':
net/ipv4/fib_frontend.c:773:12: error: 'struct netns_ipv4' has no member named 'fib_has_custom_local_routes'
   net->ipv4.fib_has_custom_local_routes = true;
            ^

Caused by commit

  6e617de84e87 ("net: avoid a full fib lookup when rp_filter is disabled.")

Paolo, it seems this struct member should be placed outside of
IP_MULTIPLE_TABLES protection, since users can insert custom
local routes even without that set.

So I'm installing the following fix for this:

====================
[PATCH] ipv4: Move fib_has_custom_local_routes outside of IP_MULTIPLE_TABLES.

net/ipv4/fib_frontend.c: In function 'fib_validate_source':
net/ipv4/fib_frontend.c:411:16: error: 'struct netns_ipv4' has no member named 'fib_has_custom_local_routes'
   if (net->ipv4.fib_has_custom_local_routes)
                ^
net/ipv4/fib_frontend.c: In function 'inet_rtm_newroute':
net/ipv4/fib_frontend.c:773:12: error: 'struct netns_ipv4' has no member named 'fib_has_custom_local_routes'
   net->ipv4.fib_has_custom_local_routes = true;
            ^

Fixes: 6e617de84e87 ("net: avoid a full fib lookup when rp_filter is disabled.")
Reported-by: Stephen Rothwell <redacted>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 include/net/netns/ipv4.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/net/netns/ipv4.h b/include/net/netns/ipv4.h
index 20720721da4b..8387f099115e 100644
--- a/include/net/netns/ipv4.h
+++ b/include/net/netns/ipv4.h

@@ -49,10 +49,10 @@ struct netns_ipv4 {
 #ifdef CONFIG_IP_MULTIPLE_TABLES
 	struct fib_rules_ops	*rules_ops;
 	bool			fib_has_custom_rules;
-	bool			fib_has_custom_local_routes;
 	struct fib_table __rcu	*fib_main;
 	struct fib_table __rcu	*fib_default;
 #endif
+	bool			fib_has_custom_local_routes;
 #ifdef CONFIG_IP_ROUTE_CLASSID
 	int			fib_num_tclassid_users;
 #endif

-- 
2.13.5

On Thu, 2017-09-21 at 18:37 -0700, David Miller wrote:

My fault, I should have fuzzed the configuration before posting.

Fix looks good, thanks David!

Paolo