ipvs: changes related to service usecnt
Change the usage of svc usecnt during command execution:
- we check if svc is registered but we do not need to hold usecnt
reference while under __ip_vs_mutex, only the packet handling needs
it during scheduling
- change __ip_vs_service_get to __ip_vs_service_find and
__ip_vs_svc_fwm_get to __ip_vs_svc_fwm_find because now caller
will increase svc->usecnt
- put common code that calls update_service in __ip_vs_update_dest
- put common code in ip_vs_unlink_service() and use it to unregister
the service
- add comment that svc should not be accessed after ip_vs_del_service
anymore
- all IP_VS_WAIT_WHILE calls are now unified: usecnt > 0
- Properly log the app ports
As result, some problems are fixed:
- possible use-after-free of svc in ip_vs_genl_set_cmd after
ip_vs_del_service because our usecnt reference does not guarantee that
svc is not freed on refcnt==0, eg. when no dests are moved to trash
- possible usecnt leak in do_ip_vs_set_ctl after ip_vs_del_service
when the service is not freed now, for example, when some
destionations are moved into trash and svc->refcnt remains above 0.
It is harmless because svc is not in hash anymore.
Signed-off-by: Julian Anastasov <ja@ssi.bg>
Acked-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Patrick McHardy <kaber@trash.net>
diff --git a/net/netfilter/ipvs/ip_vs_app.c b/net/netfilter/ipvs/ip_vs_app.c
index e76f87f..a475ede 100644
--- a/net/netfilter/ipvs/ip_vs_app.c
+++ b/net/netfilter/ipvs/ip_vs_app.c
@@ -103,8 +103,8 @@
goto out;
list_add(&inc->a_list, &app->incs_list);
- IP_VS_DBG(9, "%s application %s:%u registered\n",
- pp->name, inc->name, inc->port);
+ IP_VS_DBG(9, "%s App %s:%u registered\n",
+ pp->name, inc->name, ntohs(inc->port));
return 0;
@@ -130,7 +130,7 @@
pp->unregister_app(inc);
IP_VS_DBG(9, "%s App %s:%u unregistered\n",
- pp->name, inc->name, inc->port);
+ pp->name, inc->name, ntohs(inc->port));
list_del(&inc->a_list);