[INET]: Consolidate xxx_frag_alloc()

Just perform the kzalloc() allocation and setup common
fields in the inet_frag_queue(). Then return the result
to the caller to initialize the rest.

The inet_frag_alloc() may return NULL, so check the 
return value before doing the container_of(). This looks 
ugly, but the xxx_frag_alloc() will be removed soon.

The xxx_expire() timer callbacks are patches, 
because the argument is now the inet_frag_queue, not 
the protocol specific queue.
Signed-off-by: NPavel Emelyanov <xemul@openvz.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/net/inet_frag.h

@@ -43,6 +43,7 @@ struct inet_frags {
 	void			(*skb_free)(struct sk_buff *);
 	int			(*equal)(struct inet_frag_queue *q1,
 					 struct inet_frag_queue *q2);
+	void			(*frag_expire)(unsigned long data);
 };
 
 void inet_frags_init(struct inet_frags *);
@@ -54,6 +55,7 @@ void inet_frag_destroy(struct inet_frag_queue *q,
 int inet_frag_evictor(struct inet_frags *f);
 struct inet_frag_queue *inet_frag_intern(struct inet_frag_queue *q,
 		struct inet_frags *f, unsigned int hash);
+struct inet_frag_queue *inet_frag_alloc(struct inet_frags *f);
 
 static inline void inet_frag_put(struct inet_frag_queue *q, struct inet_frags *f)
 {

net/ipv4/inet_fragment.c

@@ -209,3 +209,20 @@ struct inet_frag_queue *inet_frag_intern(struct inet_frag_queue *qp_in,
 	return qp;
 }
 EXPORT_SYMBOL(inet_frag_intern);
+
+struct inet_frag_queue *inet_frag_alloc(struct inet_frags *f)
+{
+	struct inet_frag_queue *q;
+
+	q = kzalloc(f->qsize, GFP_ATOMIC);
+	if (q == NULL)
+		return NULL;
+
+	atomic_add(f->qsize, &f->mem);
+	setup_timer(&q->timer, f->frag_expire, (unsigned long)q);
+	spin_lock_init(&q->lock);
+	atomic_set(&q->refcnt, 1);
+
+	return q;
+}
+EXPORT_SYMBOL(inet_frag_alloc);

net/ipv4/ip_fragment.c

@@ -158,12 +158,10 @@ static __inline__ void ip4_frag_free(struct inet_frag_queue *q)
 
 static __inline__ struct ipq *frag_alloc_queue(void)
 {
-	struct ipq *qp = kzalloc(sizeof(struct ipq), GFP_ATOMIC);
+	struct inet_frag_queue *q;
 
-	if (!qp)
-		return NULL;
-	atomic_add(sizeof(struct ipq), &ip4_frags.mem);
-	return qp;
+	q = inet_frag_alloc(&ip4_frags);
+	return q ? container_of(q, struct ipq, q) : NULL;
 }
 
 
@@ -199,7 +197,9 @@ static void ip_evictor(void)
  */
 static void ip_expire(unsigned long arg)
 {
-	struct ipq *qp = (struct ipq *) arg;
+	struct ipq *qp;
+
+	qp = container_of((struct inet_frag_queue *) arg, struct ipq, q);
 
 	spin_lock(&qp->q.lock);
 
@@ -249,13 +249,6 @@ static struct ipq *ip_frag_create(struct iphdr *iph, u32 user, unsigned int h)
 	qp->user = user;
 	qp->peer = sysctl_ipfrag_max_dist ? inet_getpeer(iph->saddr, 1) : NULL;
 
-	/* Initialize a timer for this entry. */
-	init_timer(&qp->q.timer);
-	qp->q.timer.data = (unsigned long) qp;	/* pointer to queue	*/
-	qp->q.timer.function = ip_expire;		/* expire function	*/
-	spin_lock_init(&qp->q.lock);
-	atomic_set(&qp->q.refcnt, 1);
-
 	return ip_frag_intern(qp, h);
 
 out_nomem:
@@ -653,6 +646,7 @@ void __init ipfrag_init(void)
 	ip4_frags.skb_free = NULL;
 	ip4_frags.qsize = sizeof(struct ipq);
 	ip4_frags.equal = ip4_frag_equal;
+	ip4_frags.frag_expire = ip_expire;
 	inet_frags_init(&ip4_frags);
 }
 

net/ipv6/netfilter/nf_conntrack_reasm.c

@@ -137,13 +137,10 @@ static void nf_frag_free(struct inet_frag_queue *q)
 
 static inline struct nf_ct_frag6_queue *frag_alloc_queue(void)
 {
-	struct nf_ct_frag6_queue *fq;
+	struct inet_frag_queue *q;
 
-	fq = kzalloc(sizeof(struct nf_ct_frag6_queue), GFP_ATOMIC);
-	if (fq == NULL)
-		return NULL;
-	atomic_add(sizeof(struct nf_ct_frag6_queue), &nf_frags.mem);
-	return fq;
+	q = inet_frag_alloc(&nf_frags);
+	return q ? container_of(q, struct nf_ct_frag6_queue, q) : NULL;
 }
 
 /* Destruction primitives. */
@@ -168,7 +165,10 @@ static void nf_ct_frag6_evictor(void)
 
 static void nf_ct_frag6_expire(unsigned long data)
 {
-	struct nf_ct_frag6_queue *fq = (struct nf_ct_frag6_queue *) data;
+	struct nf_ct_frag6_queue *fq;
+
+	fq = container_of((struct inet_frag_queue *)data,
+			struct nf_ct_frag6_queue, q);
 
 	spin_lock(&fq->q.lock);
 
@@ -208,10 +208,6 @@ nf_ct_frag6_create(unsigned int hash, __be32 id, struct in6_addr *src,				   str
 	ipv6_addr_copy(&fq->saddr, src);
 	ipv6_addr_copy(&fq->daddr, dst);
 
-	setup_timer(&fq->q.timer, nf_ct_frag6_expire, (unsigned long)fq);
-	spin_lock_init(&fq->q.lock);
-	atomic_set(&fq->q.refcnt, 1);
-
 	return nf_ct_frag6_intern(hash, fq);
 
 oom:
@@ -726,6 +722,7 @@ int nf_ct_frag6_init(void)
 	nf_frags.skb_free = nf_skb_free;
 	nf_frags.qsize = sizeof(struct nf_ct_frag6_queue);
 	nf_frags.equal = ip6_frag_equal;
+	nf_frags.frag_expire = nf_ct_frag6_expire;
 	inet_frags_init(&nf_frags);
 
 	return 0;

net/ipv6/reassembly.c

@@ -171,12 +171,10 @@ static void ip6_frag_free(struct inet_frag_queue *fq)
 
 static inline struct frag_queue *frag_alloc_queue(void)
 {
-	struct frag_queue *fq = kzalloc(sizeof(struct frag_queue), GFP_ATOMIC);
+	struct inet_frag_queue *q;
 
-	if(!fq)
-		return NULL;
-	atomic_add(sizeof(struct frag_queue), &ip6_frags.mem);
-	return fq;
+	q = inet_frag_alloc(&ip6_frags);
+	return q ? container_of(q, struct frag_queue, q) : NULL;
 }
 
 /* Destruction primitives. */
@@ -205,9 +203,11 @@ static void ip6_evictor(struct inet6_dev *idev)
 
 static void ip6_frag_expire(unsigned long data)
 {
-	struct frag_queue *fq = (struct frag_queue *) data;
+	struct frag_queue *fq;
 	struct net_device *dev = NULL;
 
+	fq = container_of((struct inet_frag_queue *)data, struct frag_queue, q);
+
 	spin_lock(&fq->q.lock);
 
 	if (fq->q.last_in & COMPLETE)
@@ -268,12 +268,6 @@ ip6_frag_create(__be32 id, struct in6_addr *src, struct in6_addr *dst,
 	ipv6_addr_copy(&fq->saddr, src);
 	ipv6_addr_copy(&fq->daddr, dst);
 
-	init_timer(&fq->q.timer);
-	fq->q.timer.function = ip6_frag_expire;
-	fq->q.timer.data = (long) fq;
-	spin_lock_init(&fq->q.lock);
-	atomic_set(&fq->q.refcnt, 1);
-
 	return ip6_frag_intern(fq, hash);
 
 oom:
@@ -685,5 +679,6 @@ void __init ipv6_frag_init(void)
 	ip6_frags.skb_free = NULL;
 	ip6_frags.qsize = sizeof(struct frag_queue);
 	ip6_frags.equal = ip6_frag_equal;
+	ip6_frags.frag_expire = ip6_frag_expire;
 	inet_frags_init(&ip6_frags);
 }