netfilter: ipset: Convert timers to use timer_setup()

In preparation for unconditionally passing the struct timer_list pointer to
all timer callbacks, switch to using the new timer_setup() and from_timer()
to pass the timer pointer explicitly. This introduces a pointer back to the
struct ip_set, which is used instead of the struct timer_list .data field.

Cc: Pablo Neira Ayuso <pablo@netfilter.org>
Cc: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Cc: Florian Westphal <fw@strlen.de>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Stephen Hemminger <stephen@networkplumber.org>
Cc: simran singhal <singhalsimran0@gmail.com>
Cc: Muhammad Falak R Wani <falakreyaz@gmail.com>
Cc: netfilter-devel@vger.kernel.org
Cc: coreteam@netfilter.org
Cc: netdev@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 5 deletions

diff --git a/net/netfilter/ipset/ip_set_list_set.c b/net/netfilter/ipset/ip_set_list_set.c
index 178d4eba013b..c9b4e05ad940 100644
--- a/net/netfilter/ipset/ip_set_list_set.c
+++ b/net/netfilter/ipset/ip_set_list_set.c
@@ -44,6 +44,7 @@ struct set_adt_elem {
 struct list_set {
 	u32 size;		/* size of set list array */
 	struct timer_list gc;	/* garbage collection */
+	struct ip_set *set;	/* attached to this ip_set */
 	struct net *net;	/* namespace */
 	struct list_head members; /* the set members */
 };
@@ -571,10 +572,10 @@ static const struct ip_set_type_variant set_variant = {
 };
 
 static void
-list_set_gc(unsigned long ul_set)
+list_set_gc(struct timer_list *t)
 {
-	struct ip_set *set = (struct ip_set *)ul_set;
-	struct list_set *map = set->data;
+	struct list_set *map = from_timer(map, t, gc);
+	struct ip_set *set = map->set;
 
 	spin_lock_bh(&set->lock);
 	set_cleanup_entries(set);
@@ -585,11 +586,11 @@ list_set_gc(unsigned long ul_set)
 }
 
 static void
-list_set_gc_init(struct ip_set *set, void (*gc)(unsigned long ul_set))
+list_set_gc_init(struct ip_set *set, void (*gc)(struct timer_list *t))
 {
 	struct list_set *map = set->data;
 
-	setup_timer(&map->gc, gc, (unsigned long)set);
+	timer_setup(&map->gc, gc, 0);
 	mod_timer(&map->gc, jiffies + IPSET_GC_PERIOD(set->timeout) * HZ);
 }
 
@@ -606,6 +607,7 @@ init_list_set(struct net *net, struct ip_set *set, u32 size)
 
 	map->size = size;
 	map->net = net;
+	map->set = set;
 	INIT_LIST_HEAD(&map->members);
 	set->data = map;