[INET]: Consolidate xxx_frag_intern

This routine checks for the existence of a given entry
in the hash table and inserts the new one if needed.

The ->equal callback is used to compare two frag_queue-s
together, but this one is temporary and will be removed
later. The netfilter code and the ipv6 one use the same
routine to compare frags.

The inet_frag_intern() always returns non-NULL pointer,
so convert the inet_frag_queue into protocol specific
one (with the container_of) without any checks.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

6 files changed, 82 insertions, 96 deletions

diff --git a/include/net/inet_frag.h b/include/net/inet_frag.h
index 911c2cd02941..133e187fbc98 100644
--- a/include/net/inet_frag.h
+++ b/include/net/inet_frag.h
@@ -41,6 +41,8 @@ struct inet_frags {
         unsigned int            (*hashfn)(struct inet_frag_queue *);
         void                    (*destructor)(struct inet_frag_queue *);
         void                    (*skb_free)(struct sk_buff *);
+        int                     (*equal)(struct inet_frag_queue *q1,
+                                         struct inet_frag_queue *q2);
 };
 
 void inet_frags_init(struct inet_frags *);
@@ -50,6 +52,8 @@ void inet_frag_kill(struct inet_frag_queue *q, struct inet_frags *f);
 void inet_frag_destroy(struct inet_frag_queue *q,
                                 struct inet_frags *f, int *work);
 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);
 
 static inline void inet_frag_put(struct inet_frag_queue *q, struct inet_frags *f)
 {
diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index cc796cbc1b26..ff1269713462 100644
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -377,6 +377,9 @@ static inline int ipv6_prefix_equal(const struct in6_addr *a1,
                                    prefixlen);
 }
 
+struct inet_frag_queue;
+int ip6_frag_equal(struct inet_frag_queue *q1, struct inet_frag_queue *q2);
+
 static inline int ipv6_addr_any(const struct in6_addr *a)
 {
         return ((a->s6_addr32[0] | a->s6_addr32[1] | 
diff --git a/net/ipv4/inet_fragment.c b/net/ipv4/inet_fragment.c
index 484cf512858f..15054eb3d4b9 100644
--- a/net/ipv4/inet_fragment.c
+++ b/net/ipv4/inet_fragment.c
@@ -172,3 +172,40 @@ int inet_frag_evictor(struct inet_frags *f)
         return evicted;
 }
 EXPORT_SYMBOL(inet_frag_evictor);
+
+struct inet_frag_queue *inet_frag_intern(struct inet_frag_queue *qp_in,
+                struct inet_frags *f, unsigned int hash)
+{
+        struct inet_frag_queue *qp;
+#ifdef CONFIG_SMP
+        struct hlist_node *n;
+#endif
+
+        write_lock(&f->lock);
+#ifdef CONFIG_SMP
+        /* With SMP race we have to recheck hash table, because
+         * such entry could be created on other cpu, while we
+         * promoted read lock to write lock.
+         */
+        hlist_for_each_entry(qp, n, &f->hash[hash], list) {
+                if (f->equal(qp, qp_in)) {
+                        atomic_inc(&qp->refcnt);
+                        write_unlock(&f->lock);
+                        qp_in->last_in |= COMPLETE;
+                        inet_frag_put(qp_in, f);
+                        return qp;
+                }
+        }
+#endif
+        qp = qp_in;
+        if (!mod_timer(&qp->timer, jiffies + f->ctl->timeout))
+                atomic_inc(&qp->refcnt);
+
+        atomic_inc(&qp->refcnt);
+        hlist_add_head(&qp->list, &f->hash[hash]);
+        list_add_tail(&qp->lru_list, &f->lru_list);
+        f->nqueues++;
+        write_unlock(&f->lock);
+        return qp;
+}
+EXPORT_SYMBOL(inet_frag_intern);
diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c
index d12a18b8f568..4b1bbbee22c5 100644
--- a/net/ipv4/ip_fragment.c
+++ b/net/ipv4/ip_fragment.c
@@ -123,6 +123,20 @@ static unsigned int ip4_hashfn(struct inet_frag_queue *q)
         return ipqhashfn(ipq->id, ipq->saddr, ipq->daddr, ipq->protocol);
 }
 
+static int ip4_frag_equal(struct inet_frag_queue *q1,
+                struct inet_frag_queue *q2)
+{
+        struct ipq *qp1, *qp2;
+
+        qp1 = container_of(q1, struct ipq, q);
+        qp2 = container_of(q2, struct ipq, q);
+        return (qp1->id == qp2->id &&
+                        qp1->saddr == qp2->saddr &&
+                        qp1->daddr == qp2->daddr &&
+                        qp1->protocol == qp2->protocol &&
+                        qp1->user == qp2->user);
+}
+
 /* Memory Tracking Functions. */
 static __inline__ void frag_kfree_skb(struct sk_buff *skb, int *work)
 {
@@ -214,43 +228,10 @@ out:
 
 static struct ipq *ip_frag_intern(struct ipq *qp_in, unsigned int hash)
 {
-        struct ipq *qp;
-#ifdef CONFIG_SMP
-        struct hlist_node *n;
-#endif
+        struct inet_frag_queue *q;
 
-        write_lock(&ip4_frags.lock);
-#ifdef CONFIG_SMP
-        /* With SMP race we have to recheck hash table, because
-         * such entry could be created on other cpu, while we
-         * promoted read lock to write lock.
-         */
-        hlist_for_each_entry(qp, n, &ip4_frags.hash[hash], q.list) {
-                if (qp->id == qp_in->id         &&
-                    qp->saddr == qp_in->saddr   &&
-                    qp->daddr == qp_in->daddr   &&
-                    qp->protocol == qp_in->protocol &&
-                    qp->user == qp_in->user) {
-                        atomic_inc(&qp->q.refcnt);
-                        write_unlock(&ip4_frags.lock);
-                        qp_in->q.last_in |= COMPLETE;
-                        ipq_put(qp_in);
-                        return qp;
-                }
-        }
-#endif
-        qp = qp_in;
-
-        if (!mod_timer(&qp->q.timer, jiffies + ip4_frags_ctl.timeout))
-                atomic_inc(&qp->q.refcnt);
-
-        atomic_inc(&qp->q.refcnt);
-        hlist_add_head(&qp->q.list, &ip4_frags.hash[hash]);
-        INIT_LIST_HEAD(&qp->q.lru_list);
-        list_add_tail(&qp->q.lru_list, &ip4_frags.lru_list);
-        ip4_frags.nqueues++;
-        write_unlock(&ip4_frags.lock);
-        return qp;
+        q = inet_frag_intern(&qp_in->q, &ip4_frags, hash);
+        return container_of(q, struct ipq, q);
 }
 
 /* Add an entry to the 'ipq' queue for a newly received IP datagram. */
@@ -671,6 +652,7 @@ void __init ipfrag_init(void)
         ip4_frags.destructor = ip4_frag_free;
         ip4_frags.skb_free = NULL;
         ip4_frags.qsize = sizeof(struct ipq);
+        ip4_frags.equal = ip4_frag_equal;
         inet_frags_init(&ip4_frags);
 }
 
diff --git a/net/ipv6/netfilter/nf_conntrack_reasm.c b/net/ipv6/netfilter/nf_conntrack_reasm.c
index 726fafd41961..d7dc444ec48f 100644
--- a/net/ipv6/netfilter/nf_conntrack_reasm.c
+++ b/net/ipv6/netfilter/nf_conntrack_reasm.c
@@ -187,37 +187,10 @@ out:
 static struct nf_ct_frag6_queue *nf_ct_frag6_intern(unsigned int hash,
                                           struct nf_ct_frag6_queue *fq_in)
 {
-        struct nf_ct_frag6_queue *fq;
-#ifdef CONFIG_SMP
-        struct hlist_node *n;
-#endif
-
-        write_lock(&nf_frags.lock);
-#ifdef CONFIG_SMP
-        hlist_for_each_entry(fq, n, &nf_frags.hash[hash], q.list) {
-                if (fq->id == fq_in->id &&
-                    ipv6_addr_equal(&fq_in->saddr, &fq->saddr) &&
-                    ipv6_addr_equal(&fq_in->daddr, &fq->daddr)) {
-                        atomic_inc(&fq->q.refcnt);
-                        write_unlock(&nf_frags.lock);
-                        fq_in->q.last_in |= COMPLETE;
-                        fq_put(fq_in);
-                        return fq;
-                }
-        }
-#endif
-        fq = fq_in;
+        struct inet_frag_queue *q;
 
-        if (!mod_timer(&fq->q.timer, jiffies + nf_frags_ctl.timeout))
-                atomic_inc(&fq->q.refcnt);
-
-        atomic_inc(&fq->q.refcnt);
-        hlist_add_head(&fq->q.list, &nf_frags.hash[hash]);
-        INIT_LIST_HEAD(&fq->q.lru_list);
-        list_add_tail(&fq->q.lru_list, &nf_frags.lru_list);
-        nf_frags.nqueues++;
-        write_unlock(&nf_frags.lock);
-        return fq;
+        q = inet_frag_intern(&fq_in->q, &nf_frags, hash);
+        return container_of(q, struct nf_ct_frag6_queue, q);
 }
 
 
@@ -752,6 +725,7 @@ int nf_ct_frag6_init(void)
         nf_frags.destructor = nf_frag_free;
         nf_frags.skb_free = nf_skb_free;
         nf_frags.qsize = sizeof(struct nf_ct_frag6_queue);
+        nf_frags.equal = ip6_frag_equal;
         inet_frags_init(&nf_frags);
 
         return 0;
diff --git a/net/ipv6/reassembly.c b/net/ipv6/reassembly.c
index 0a1bf43bd489..73ea204eaa6f 100644
--- a/net/ipv6/reassembly.c
+++ b/net/ipv6/reassembly.c
@@ -143,6 +143,18 @@ static unsigned int ip6_hashfn(struct inet_frag_queue *q)
         return ip6qhashfn(fq->id, &fq->saddr, &fq->daddr);
 }
 
+int ip6_frag_equal(struct inet_frag_queue *q1, struct inet_frag_queue *q2)
+{
+        struct frag_queue *fq1, *fq2;
+
+        fq1 = container_of(q1, struct frag_queue, q);
+        fq2 = container_of(q2, struct frag_queue, q);
+        return (fq1->id == fq2->id &&
+                        ipv6_addr_equal(&fq2->saddr, &fq1->saddr) &&
+                        ipv6_addr_equal(&fq2->daddr, &fq1->daddr));
+}
+EXPORT_SYMBOL(ip6_frag_equal);
+
 /* Memory Tracking Functions. */
 static inline void frag_kfree_skb(struct sk_buff *skb, int *work)
 {
@@ -236,37 +248,10 @@ out:
 static struct frag_queue *ip6_frag_intern(struct frag_queue *fq_in,
                 unsigned int hash)
 {
-        struct frag_queue *fq;
-#ifdef CONFIG_SMP
-        struct hlist_node *n;
-#endif
-
-        write_lock(&ip6_frags.lock);
-#ifdef CONFIG_SMP
-        hlist_for_each_entry(fq, n, &ip6_frags.hash[hash], q.list) {
-                if (fq->id == fq_in->id &&
-                    ipv6_addr_equal(&fq_in->saddr, &fq->saddr) &&
-                    ipv6_addr_equal(&fq_in->daddr, &fq->daddr)) {
-                        atomic_inc(&fq->q.refcnt);
-                        write_unlock(&ip6_frags.lock);
-                        fq_in->q.last_in |= COMPLETE;
-                        fq_put(fq_in);
-                        return fq;
-                }
-        }
-#endif
-        fq = fq_in;
-
-        if (!mod_timer(&fq->q.timer, jiffies + ip6_frags_ctl.timeout))
-                atomic_inc(&fq->q.refcnt);
+        struct inet_frag_queue *q;
 
-        atomic_inc(&fq->q.refcnt);
-        hlist_add_head(&fq->q.list, &ip6_frags.hash[hash]);
-        INIT_LIST_HEAD(&fq->q.lru_list);
-        list_add_tail(&fq->q.lru_list, &ip6_frags.lru_list);
-        ip6_frags.nqueues++;
-        write_unlock(&ip6_frags.lock);
-        return fq;
+        q = inet_frag_intern(&fq_in->q, &ip6_frags, hash);
+        return container_of(q, struct frag_queue, q);
 }
 
 
@@ -699,5 +684,6 @@ void __init ipv6_frag_init(void)
         ip6_frags.destructor = ip6_frag_free;
         ip6_frags.skb_free = NULL;
         ip6_frags.qsize = sizeof(struct frag_queue);
+        ip6_frags.equal = ip6_frag_equal;
         inet_frags_init(&ip6_frags);
 }