Re: [PATCH] inet: frags: Convert timers to use timer_setup()

[Stefan Schmidt <stefan@datenfreihafen.org>]

Hello.

On 05.10.2017 02:52, Kees Cook wrote:
> 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
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Signed-off-by: Kees Cook <keescook@chromium.org>
> ---
> This requires commit 686fef928bba ("timer: Prepare to change timer
> callback argument type") in v4.14-rc3, but should be otherwise
> stand-alone.
> ---
>  include/net/inet_frag.h                 | 2 +-
>  net/ieee802154/6lowpan/reassembly.c     | 5 +++--
>  net/ipv4/inet_fragment.c                | 4 ++--
>  net/ipv4/ip_fragment.c                  | 5 +++--
>  net/ipv6/netfilter/nf_conntrack_reasm.c | 5 +++--
>  net/ipv6/reassembly.c                   | 5 +++--
>  6 files changed, 15 insertions(+), 11 deletions(-)
> 
> diff --git a/include/net/inet_frag.h b/include/net/inet_frag.h
> index fc59e0775e00..c695807ca707 100644
> --- a/include/net/inet_frag.h
> +++ b/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;
>  };
> diff --git a/net/ieee802154/6lowpan/reassembly.c b/net/ieee802154/6lowpan/reassembly.c
> index f85b08baff16..85bf86ad6b18 100644
> --- a/net/ieee802154/6lowpan/reassembly.c
> +++ b/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);
> diff --git a/net/ipv4/inet_fragment.c b/net/ipv4/inet_fragment.c
> index af74d0433453..7f3ef5c287a1 100644
> --- a/net/ipv4/inet_fragment.c
> +++ b/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);
>  
> diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c
> index 46408c220d9d..9215654a401f 100644
> --- a/net/ipv4/ip_fragment.c
> +++ b/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();
> diff --git a/net/ipv6/netfilter/nf_conntrack_reasm.c b/net/ipv6/netfilter/nf_conntrack_reasm.c
> index b263bf3a19f7..977d8900cfd1 100644
> --- a/net/ipv6/netfilter/nf_conntrack_reasm.c
> +++ b/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);
> diff --git a/net/ipv6/reassembly.c b/net/ipv6/reassembly.c
> index 846012eae526..afbc000ad4f2 100644
> --- a/net/ipv6/reassembly.c
> +++ b/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);
> 

For the ieee802154 part:

Acked-by: Stefan Schmidt <stefan@osg.samsung.com>

regards
Stefan Schmidt