inet: frags: 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.

Cc: Alexander Aring <alex.aring@gmail.com>
Cc: Stefan Schmidt <stefan@osg.samsung.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
Cc: Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>
Cc: Pablo Neira Ayuso <pablo@netfilter.org>
Cc: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Cc: Florian Westphal <fw@strlen.de>
Cc: linux-wpan@vger.kernel.org
Cc: netdev@vger.kernel.org
Cc: netfilter-devel@vger.kernel.org
Cc: coreteam@netfilter.org
Signed-off-by: NKees Cook <keescook@chromium.org>
Acked-by: Stefan Schmidt <stefan@osg.samsung.com> # for ieee802154
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/net/inet_frag.h

@@ -95,7 +95,7 @@ struct inet_frags {
 	void			(*constructor)(struct inet_frag_queue *q,
 					       const void *arg);
 	void			(*destructor)(struct inet_frag_queue *);
-	void			(*frag_expire)(unsigned long data);
+	void			(*frag_expire)(struct timer_list *t);
 	struct kmem_cache	*frags_cachep;
 	const char		*frags_cache_name;
 };

net/ieee802154/6lowpan/reassembly.c

@@ -80,12 +80,13 @@ static void lowpan_frag_init(struct inet_frag_queue *q, const void *a)
 	fq->daddr = *arg->dst;
 }
 
-static void lowpan_frag_expire(unsigned long data)
+static void lowpan_frag_expire(struct timer_list *t)
 {
+	struct inet_frag_queue *frag = from_timer(frag, t, timer);
 	struct frag_queue *fq;
 	struct net *net;
 
-	fq = container_of((struct inet_frag_queue *)data, struct frag_queue, q);
+	fq = container_of(frag, struct frag_queue, q);
 	net = container_of(fq->q.net, struct net, ieee802154_lowpan.frags);
 
 	spin_lock(&fq->q.lock);

net/ipv4/inet_fragment.c

@@ -147,7 +147,7 @@ inet_evict_bucket(struct inet_frags *f, struct inet_frag_bucket *hb)
 	spin_unlock(&hb->chain_lock);
 
 	hlist_for_each_entry_safe(fq, n, &expired, list_evictor)
-		f->frag_expire((unsigned long) fq);
+		f->frag_expire(&fq->timer);
 
 	return evicted;
 }
@@ -366,7 +366,7 @@ static struct inet_frag_queue *inet_frag_alloc(struct netns_frags *nf,
 	f->constructor(q, arg);
 	add_frag_mem_limit(nf, f->qsize);
 
-	setup_timer(&q->timer, f->frag_expire, (unsigned long)q);
+	timer_setup(&q->timer, f->frag_expire, 0);
 	spin_lock_init(&q->lock);
 	refcount_set(&q->refcnt, 1);
 

net/ipv4/ip_fragment.c

@@ -190,12 +190,13 @@ static bool frag_expire_skip_icmp(u32 user)
 /*
  * Oops, a fragment queue timed out.  Kill it and send an ICMP reply.
  */
-static void ip_expire(unsigned long arg)
+static void ip_expire(struct timer_list *t)
 {
+	struct inet_frag_queue *frag = from_timer(frag, t, timer);
 	struct ipq *qp;
 	struct net *net;
 
-	qp = container_of((struct inet_frag_queue *) arg, struct ipq, q);
+	qp = container_of(frag, struct ipq, q);
 	net = container_of(qp->q.net, struct net, ipv4.frags);
 
 	rcu_read_lock();

net/ipv6/netfilter/nf_conntrack_reasm.c

@@ -169,12 +169,13 @@ static unsigned int nf_hashfn(const struct inet_frag_queue *q)
 	return nf_hash_frag(nq->id, &nq->saddr, &nq->daddr);
 }
 
-static void nf_ct_frag6_expire(unsigned long data)
+static void nf_ct_frag6_expire(struct timer_list *t)
 {
+	struct inet_frag_queue *frag = from_timer(frag, t, timer);
 	struct frag_queue *fq;
 	struct net *net;
 
-	fq = container_of((struct inet_frag_queue *)data, struct frag_queue, q);
+	fq = container_of(frag, struct frag_queue, q);
 	net = container_of(fq->q.net, struct net, nf_frag.frags);
 
 	ip6_expire_frag_queue(net, fq, &nf_frags);

net/ipv6/reassembly.c

@@ -170,12 +170,13 @@ void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq,
 }
 EXPORT_SYMBOL(ip6_expire_frag_queue);
 
-static void ip6_frag_expire(unsigned long data)
+static void ip6_frag_expire(struct timer_list *t)
 {
+	struct inet_frag_queue *frag = from_timer(frag, t, timer);
 	struct frag_queue *fq;
 	struct net *net;
 
-	fq = container_of((struct inet_frag_queue *)data, struct frag_queue, q);
+	fq = container_of(frag, struct frag_queue, q);
 	net = container_of(fq->q.net, struct net, ipv6.frags);
 
 	ip6_expire_frag_queue(net, fq, &ip6_frags);