Subject: [PATCH] netfilter: ipset: Convert timers to use timer_setup()

From: Kees Cook <[email-masked]>
Date: Wed, 4 Oct 2017 17:52:21 -0700

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 <[email-masked]>
Cc: Jozsef Kadlecsik <[email-masked]>
Cc: Florian Westphal <[email-masked]>
Cc: "David S. Miller" <[email-masked]>
Cc: Stephen Hemminger <[email-masked]>
Cc: simran singhal <[email-masked]>
Cc: Muhammad Falak R Wani <[email-masked]>
Cc: [email-masked]
Cc: [email-masked]
Cc: [email-masked]
Cc: Thomas Gleixner <[email-masked]>
Signed-off-by: Kees Cook <[email-masked]>
---
This requires commit 686fef928bba ("timer: Prepare to change timer
callback argument type") in v4.14-rc3, but should be otherwise
stand-alone.
---
 net/netfilter/ipset/ip_set_bitmap_gen.h   | 10 +++++-----
 net/netfilter/ipset/ip_set_bitmap_ip.c    |  2 ++
 net/netfilter/ipset/ip_set_bitmap_ipmac.c |  2 ++
 net/netfilter/ipset/ip_set_bitmap_port.c  |  2 ++
 net/netfilter/ipset/ip_set_hash_gen.h     | 12 +++++++-----
 5 files changed, 18 insertions(+), 10 deletions(-)

diff --git a/net/netfilter/ipset/ip_set_bitmap_gen.h b/net/netfilter/ipset/ip_set_bitmap_gen.h
index 8ad2b52a0b32..5ca18f07683b 100644
--- a/net/netfilter/ipset/ip_set_bitmap_gen.h
+++ b/net/netfilter/ipset/ip_set_bitmap_gen.h
@@ -37,11 +37,11 @@
 #define get_ext(set, map, id)	((map)->extensions + ((set)->dsize * (id)))
 
 static void
-mtype_gc_init(struct ip_set *set, void (*gc)(unsigned long ul_set))
+mtype_gc_init(struct ip_set *set, void (*gc)(struct timer_list *t))
 {
 	struct mtype *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);
 }
 
@@ -272,10 +272,10 @@ mtype_list(const struct ip_set *set,
 }
 
 static void
-mtype_gc(unsigned long ul_set)
+mtype_gc(struct timer_list *t)
 {
-	struct ip_set *set = (struct ip_set *)ul_set;
-	struct mtype *map = set->data;
+	struct mtype *map = from_timer(map, t, gc);
+	struct ip_set *set = map->set;
 	void *x;
 	u32 id;
 
diff --git a/net/netfilter/ipset/ip_set_bitmap_ip.c b/net/netfilter/ipset/ip_set_bitmap_ip.c
index 4783efff0bde..d8975a0b4282 100644
--- a/net/netfilter/ipset/ip_set_bitmap_ip.c
+++ b/net/netfilter/ipset/ip_set_bitmap_ip.c
@@ -48,6 +48,7 @@ struct bitmap_ip {
 	size_t memsize;		/* members size */
 	u8 netmask;		/* subnet netmask */
 	struct timer_list gc;	/* garbage collection */
+	struct ip_set *set;	/* attached to this ip_set */
 	unsigned char extensions[0]	/* data extensions */
 		__aligned(__alignof__(u64));
 };
@@ -232,6 +233,7 @@ init_map_ip(struct ip_set *set, struct bitmap_ip *map,
 	map->netmask = netmask;
 	set->timeout = IPSET_NO_TIMEOUT;
 
+	map->set = set;
 	set->data = map;
 	set->family = NFPROTO_IPV4;
 
diff --git a/net/netfilter/ipset/ip_set_bitmap_ipmac.c b/net/netfilter/ipset/ip_set_bitmap_ipmac.c
index 9a065f672d3a..4c279fbd2d5d 100644
--- a/net/netfilter/ipset/ip_set_bitmap_ipmac.c
+++ b/net/netfilter/ipset/ip_set_bitmap_ipmac.c
@@ -52,6 +52,7 @@ struct bitmap_ipmac {
 	u32 elements;		/* number of max elements in the set */
 	size_t memsize;		/* members size */
 	struct timer_list gc;	/* garbage collector */
+	struct ip_set *set;	/* attached to this ip_set */
 	unsigned char extensions[0]	/* MAC + data extensions */
 		__aligned(__alignof__(u64));
 };
@@ -307,6 +308,7 @@ init_map_ipmac(struct ip_set *set, struct bitmap_ipmac *map,
 	map->elements = elements;
 	set->timeout = IPSET_NO_TIMEOUT;
 
+	map->set = set;
 	set->data = map;
 	set->family = NFPROTO_IPV4;
 
diff --git a/net/netfilter/ipset/ip_set_bitmap_port.c b/net/netfilter/ipset/ip_set_bitmap_port.c
index 7f0c733358a4..7f9bbd7c98b5 100644
--- a/net/netfilter/ipset/ip_set_bitmap_port.c
+++ b/net/netfilter/ipset/ip_set_bitmap_port.c
@@ -40,6 +40,7 @@ struct bitmap_port {
 	u32 elements;		/* number of max elements in the set */
 	size_t memsize;		/* members size */
 	struct timer_list gc;	/* garbage collection */
+	struct ip_set *set;	/* attached to this ip_set */
 	unsigned char extensions[0]	/* data extensions */
 		__aligned(__alignof__(u64));
 };
@@ -214,6 +215,7 @@ init_map_port(struct ip_set *set, struct bitmap_port *map,
 	map->last_port = last_port;
 	set->timeout = IPSET_NO_TIMEOUT;
 
+	map->set = set;
 	set->data = map;
 	set->family = NFPROTO_UNSPEC;
 
diff --git a/net/netfilter/ipset/ip_set_hash_gen.h b/net/netfilter/ipset/ip_set_hash_gen.h
index 51063d9ed0f7..efffc8eabafe 100644
--- a/net/netfilter/ipset/ip_set_hash_gen.h
+++ b/net/netfilter/ipset/ip_set_hash_gen.h
@@ -280,6 +280,7 @@ htable_bits(u32 hashsize)
 struct htype {
 	struct htable __rcu *table; /* the hash table */
 	struct timer_list gc;	/* garbage collection when timeout enabled */
+	struct ip_set *set;	/* attached to this ip_set */
 	u32 maxelem;		/* max elements in the hash */
 	u32 initval;		/* random jhash init value */
 #ifdef IP_SET_HASH_WITH_MARKMASK
@@ -429,11 +430,11 @@ mtype_destroy(struct ip_set *set)
 }
 
 static void
-mtype_gc_init(struct ip_set *set, void (*gc)(unsigned long ul_set))
+mtype_gc_init(struct ip_set *set, void (*gc)(struct timer_list *t))
 {
 	struct htype *h = set->data;
 
-	setup_timer(&h->gc, gc, (unsigned long)set);
+	timer_setup(&h->gc, gc, 0);
 	mod_timer(&h->gc, jiffies + IPSET_GC_PERIOD(set->timeout) * HZ);
 	pr_debug("gc initialized, run in every %u\n",
 		 IPSET_GC_PERIOD(set->timeout));
@@ -526,10 +527,10 @@ mtype_expire(struct ip_set *set, struct htype *h)
 }
 
 static void
-mtype_gc(unsigned long ul_set)
+mtype_gc(struct timer_list *t)
 {
-	struct ip_set *set = (struct ip_set *)ul_set;
-	struct htype *h = set->data;
+	struct htype *h = from_timer(h, t, gc);
+	struct ip_set *set = h->set;
 
 	pr_debug("called\n");
 	spin_lock_bh(&set->lock);
@@ -1314,6 +1315,7 @@ IPSET_TOKEN(HTYPE, _create)(struct net *net, struct ip_set *set,
 	t->htable_bits = hbits;
 	RCU_INIT_POINTER(h->table, t);
 
+	h->set = set;
 	set->data = h;
 #ifndef IP_SET_PROTO_UNDEF
 	if (set->family == NFPROTO_IPV4) {
-- 
2.7.4

-- 
Kees Cook
Pixel Security