[INET]: Consolidate xxx_the secret_rebuild

This code works with the generic data types as well, so
move this into inet_fragment.c

This move makes it possible to hide the secret_timer
management and the secret_rebuild routine completely in
the inet_fragment.c

Introduce the ->hashfn() callback in inet_frags() to get
the hashfun for a given inet_frag_queue() object.
Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/inet_frag.h

@@ -36,6 +36,8 @@ struct inet_frags {
 	atomic_t		mem;
 	struct timer_list	secret_timer;
 	struct inet_frags_ctl	*ctl;
+
+	unsigned int		(*hashfn)(struct inet_frag_queue *);
 };
 
 void inet_frags_init(struct inet_frags *);

net/ipv4/inet_fragment.c

@@ -16,9 +16,38 @@
 #include <linux/module.h>
 #include <linux/timer.h>
 #include <linux/mm.h>
+#include <linux/random.h>
 
 #include <net/inet_frag.h>
 
+static void inet_frag_secret_rebuild(unsigned long dummy)
+{
+	struct inet_frags *f = (struct inet_frags *)dummy;
+	unsigned long now = jiffies;
+	int i;
+
+	write_lock(&f->lock);
+	get_random_bytes(&f->rnd, sizeof(u32));
+	for (i = 0; i < INETFRAGS_HASHSZ; i++) {
+		struct inet_frag_queue *q;
+		struct hlist_node *p, *n;
+
+		hlist_for_each_entry_safe(q, p, n, &f->hash[i], list) {
+			unsigned int hval = f->hashfn(q);
+
+			if (hval != i) {
+				hlist_del(&q->list);
+
+				/* Relink to new hash chain. */
+				hlist_add_head(&q->list, &f->hash[hval]);
+			}
+		}
+	}
+	write_unlock(&f->lock);
+
+	mod_timer(&f->secret_timer, now + f->ctl->secret_interval);
+}
+
 void inet_frags_init(struct inet_frags *f)
 {
 	int i;
@@ -35,11 +64,17 @@ void inet_frags_init(struct inet_frags *f)
 	f->nqueues = 0;
 	atomic_set(&f->mem, 0);
 
+	init_timer(&f->secret_timer);
+	f->secret_timer.function = inet_frag_secret_rebuild;
+	f->secret_timer.data = (unsigned long)f;
+	f->secret_timer.expires = jiffies + f->ctl->secret_interval;
+	add_timer(&f->secret_timer);
 }
 EXPORT_SYMBOL(inet_frags_init);
 
 void inet_frags_fini(struct inet_frags *f)
 {
+	del_timer(&f->secret_timer);
 }
 EXPORT_SYMBOL(inet_frags_fini);
 

net/ipv4/ip_fragment.c

@@ -115,32 +115,12 @@ static unsigned int ipqhashfn(__be16 id, __be32 saddr, __be32 daddr, u8 prot)
 			    ip4_frags.rnd) & (INETFRAGS_HASHSZ - 1);
 }
 
-static void ipfrag_secret_rebuild(unsigned long dummy)
+static unsigned int ip4_hashfn(struct inet_frag_queue *q)
 {
-	unsigned long now = jiffies;
-	int i;
+	struct ipq *ipq;
 
-	write_lock(&ip4_frags.lock);
-	get_random_bytes(&ip4_frags.rnd, sizeof(u32));
-	for (i = 0; i < INETFRAGS_HASHSZ; i++) {
-		struct ipq *q;
-		struct hlist_node *p, *n;
-
-		hlist_for_each_entry_safe(q, p, n, &ip4_frags.hash[i], q.list) {
-			unsigned int hval = ipqhashfn(q->id, q->saddr,
-						      q->daddr, q->protocol);
-
-			if (hval != i) {
-				hlist_del(&q->q.list);
-
-				/* Relink to new hash chain. */
-				hlist_add_head(&q->q.list, &ip4_frags.hash[hval]);
-			}
-		}
-	}
-	write_unlock(&ip4_frags.lock);
-
-	mod_timer(&ip4_frags.secret_timer, now + ip4_frags_ctl.secret_interval);
+	ipq = container_of(q, struct ipq, q);
+	return ipqhashfn(ipq->id, ipq->saddr, ipq->daddr, ipq->protocol);
 }
 
 /* Memory Tracking Functions. */
@@ -739,12 +719,8 @@ int ip_defrag(struct sk_buff *skb, u32 user)
 
 void __init ipfrag_init(void)
 {
-	init_timer(&ip4_frags.secret_timer);
-	ip4_frags.secret_timer.function = ipfrag_secret_rebuild;
-	ip4_frags.secret_timer.expires = jiffies + ip4_frags_ctl.secret_interval;
-	add_timer(&ip4_frags.secret_timer);
-
 	ip4_frags.ctl = &ip4_frags_ctl;
+	ip4_frags.hashfn = ip4_hashfn;
 	inet_frags_init(&ip4_frags);
 }
 

net/ipv6/netfilter/nf_conntrack_reasm.c

@@ -106,32 +106,12 @@ static unsigned int ip6qhashfn(__be32 id, struct in6_addr *saddr,
 	return c & (INETFRAGS_HASHSZ - 1);
 }
 
-static void nf_ct_frag6_secret_rebuild(unsigned long dummy)
+static unsigned int nf_hashfn(struct inet_frag_queue *q)
 {
-	unsigned long now = jiffies;
-	int i;
+	struct nf_ct_frag6_queue *nq;
 
-	write_lock(&nf_frags.lock);
-	get_random_bytes(&nf_frags.rnd, sizeof(u32));
-	for (i = 0; i < INETFRAGS_HASHSZ; i++) {
-		struct nf_ct_frag6_queue *q;
-		struct hlist_node *p, *n;
-
-		hlist_for_each_entry_safe(q, p, n, &nf_frags.hash[i], q.list) {
-			unsigned int hval = ip6qhashfn(q->id,
-						       &q->saddr,
-						       &q->daddr);
-			if (hval != i) {
-				hlist_del(&q->q.list);
-				/* Relink to new hash chain. */
-				hlist_add_head(&q->q.list,
-					       &nf_frags.hash[hval]);
-			}
-		}
-	}
-	write_unlock(&nf_frags.lock);
-
-	mod_timer(&nf_frags.secret_timer, now + nf_frags_ctl.secret_interval);
+	nq = container_of(q, struct nf_ct_frag6_queue, q);
+	return ip6qhashfn(nq->id, &nq->saddr, &nq->daddr);
 }
 
 /* Memory Tracking Functions. */
@@ -817,11 +797,8 @@ int nf_ct_frag6_kfree_frags(struct sk_buff *skb)
 
 int nf_ct_frag6_init(void)
 {
-	setup_timer(&nf_frags.secret_timer, nf_ct_frag6_secret_rebuild, 0);
-	nf_frags.secret_timer.expires = jiffies + nf_frags_ctl.secret_interval;
-	add_timer(&nf_frags.secret_timer);
-
 	nf_frags.ctl = &nf_frags_ctl;
+	nf_frags.hashfn = nf_hashfn;
 	inet_frags_init(&nf_frags);
 
 	return 0;
@@ -831,7 +808,6 @@ void nf_ct_frag6_cleanup(void)
 {
 	inet_frags_fini(&nf_frags);
 
-	del_timer(&nf_frags.secret_timer);
 	nf_frags_ctl.low_thresh = 0;
 	nf_ct_frag6_evictor();
 }

net/ipv6/reassembly.c

@@ -135,35 +135,12 @@ static unsigned int ip6qhashfn(__be32 id, struct in6_addr *saddr,
 	return c & (INETFRAGS_HASHSZ - 1);
 }
 
-static void ip6_frag_secret_rebuild(unsigned long dummy)
+static unsigned int ip6_hashfn(struct inet_frag_queue *q)
 {
-	unsigned long now = jiffies;
-	int i;
-
-	write_lock(&ip6_frags.lock);
-	get_random_bytes(&ip6_frags.rnd, sizeof(u32));
-	for (i = 0; i < INETFRAGS_HASHSZ; i++) {
-		struct frag_queue *q;
-		struct hlist_node *p, *n;
-
-		hlist_for_each_entry_safe(q, p, n, &ip6_frags.hash[i], q.list) {
-			unsigned int hval = ip6qhashfn(q->id,
-						       &q->saddr,
-						       &q->daddr);
-
-			if (hval != i) {
-				hlist_del(&q->q.list);
-
-				/* Relink to new hash chain. */
-				hlist_add_head(&q->q.list,
-					       &ip6_frags.hash[hval]);
-
-			}
-		}
-	}
-	write_unlock(&ip6_frags.lock);
+	struct frag_queue *fq;
 
-	mod_timer(&ip6_frags.secret_timer, now + ip6_frags_ctl.secret_interval);
+	fq = container_of(q, struct frag_queue, q);
+	return ip6qhashfn(fq->id, &fq->saddr, &fq->daddr);
 }
 
 /* Memory Tracking Functions. */
@@ -765,11 +742,7 @@ void __init ipv6_frag_init(void)
 	if (inet6_add_protocol(&frag_protocol, IPPROTO_FRAGMENT) < 0)
 		printk(KERN_ERR "ipv6_frag_init: Could not register protocol\n");
 
-	init_timer(&ip6_frags.secret_timer);
-	ip6_frags.secret_timer.function = ip6_frag_secret_rebuild;
-	ip6_frags.secret_timer.expires = jiffies + ip6_frags_ctl.secret_interval;
-	add_timer(&ip6_frags.secret_timer);
-
 	ip6_frags.ctl = &ip6_frags_ctl;
+	ip6_frags.hashfn = ip6_hashfn;
 	inet_frags_init(&ip6_frags);
 }