[INET]: Consolidate xxx_find() in fragment management

Here we need another callback ->match to check whether the
entry found in hash matches the key passed. The key used 
is the same as the creation argument for inet_frag_create.

Yet again, this ->match is the same for netfilter and ipv6.
Running a frew steps forward - this callback will later
replace the ->equal one.

Since the inet_frag_find() uses the already consolidated
inet_frag_create() remove the xxx_frag_create from protocol
codes.

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

6 files changed, 73 insertions, 98 deletions

diff --git a/include/net/inet_frag.h b/include/net/inet_frag.h
index e33072b9fd91..64299266a868 100644
--- a/include/net/inet_frag.h
+++ b/include/net/inet_frag.h
@@ -45,6 +45,8 @@ struct inet_frags {
         void                    (*skb_free)(struct sk_buff *);
         int                     (*equal)(struct inet_frag_queue *q1,
                                          struct inet_frag_queue *q2);
+        int                     (*match)(struct inet_frag_queue *q,
+                                                void *arg);
         void                    (*frag_expire)(unsigned long data);
 };
 
@@ -55,8 +57,8 @@ 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_create(struct inet_frags *f,
-                void *create_arg, unsigned int hash);
+struct inet_frag_queue *inet_frag_find(struct inet_frags *f, void *key,
+                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 9dc99bf5cf0e..005853a33ef6 100644
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -387,6 +387,7 @@ struct ip6_create_arg {
 };
 
 void ip6_frag_init(struct inet_frag_queue *q, void *a);
+int ip6_frag_match(struct inet_frag_queue *q, void *a);
 
 static inline int ipv6_addr_any(const struct in6_addr *a)
 {
diff --git a/net/ipv4/inet_fragment.c b/net/ipv4/inet_fragment.c
index b531f803cda4..6ba98ebbed93 100644
--- a/net/ipv4/inet_fragment.c
+++ b/net/ipv4/inet_fragment.c
@@ -226,8 +226,8 @@ static struct inet_frag_queue *inet_frag_alloc(struct inet_frags *f, void *arg)
         return q;
 }
 
-struct inet_frag_queue *inet_frag_create(struct inet_frags *f, void *arg,
-                unsigned int hash)
+static struct inet_frag_queue *inet_frag_create(struct inet_frags *f,
+                void *arg, unsigned int hash)
 {
         struct inet_frag_queue *q;
 
@@ -237,4 +237,23 @@ struct inet_frag_queue *inet_frag_create(struct inet_frags *f, void *arg,
 
         return inet_frag_intern(q, f, hash);
 }
-EXPORT_SYMBOL(inet_frag_create);
+
+struct inet_frag_queue *inet_frag_find(struct inet_frags *f, void *key,
+                unsigned int hash)
+{
+        struct inet_frag_queue *q;
+        struct hlist_node *n;
+
+        read_lock(&f->lock);
+        hlist_for_each_entry(q, n, &f->hash[hash], list) {
+                if (f->match(q, key)) {
+                        atomic_inc(&q->refcnt);
+                        read_unlock(&f->lock);
+                        return q;
+                }
+        }
+        read_unlock(&f->lock);
+
+        return inet_frag_create(f, key, hash);
+}
+EXPORT_SYMBOL(inet_frag_find);
diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c
index 0d6cff1de5a3..928259dbc0f8 100644
--- a/net/ipv4/ip_fragment.c
+++ b/net/ipv4/ip_fragment.c
@@ -142,6 +142,19 @@ static int ip4_frag_equal(struct inet_frag_queue *q1,
                         qp1->user == qp2->user);
 }
 
+static int ip4_frag_match(struct inet_frag_queue *q, void *a)
+{
+        struct ipq *qp;
+        struct ip4_create_arg *arg = a;
+
+        qp = container_of(q, struct ipq, q);
+        return (qp->id == arg->iph->id &&
+                        qp->saddr == arg->iph->saddr &&
+                        qp->daddr == arg->iph->daddr &&
+                        qp->protocol == arg->iph->protocol &&
+                        qp->user == arg->user);
+}
+
 /* Memory Tracking Functions. */
 static __inline__ void frag_kfree_skb(struct sk_buff *skb, int *work)
 {
@@ -235,18 +248,20 @@ out:
         ipq_put(qp);
 }
 
-/* Creation primitives. */
-
-/* Add an entry to the 'ipq' queue for a newly received IP datagram. */
-static struct ipq *ip_frag_create(struct iphdr *iph, u32 user, unsigned int h)
+/* Find the correct entry in the "incomplete datagrams" queue for
+ * this IP datagram, and create new one, if nothing is found.
+ */
+static inline struct ipq *ip_find(struct iphdr *iph, u32 user)
 {
         struct inet_frag_queue *q;
         struct ip4_create_arg arg;
+        unsigned int hash;
 
         arg.iph = iph;
         arg.user = user;
+        hash = ipqhashfn(iph->id, iph->saddr, iph->daddr, iph->protocol);
 
-        q = inet_frag_create(&ip4_frags, &arg, h);
+        q = inet_frag_find(&ip4_frags, &arg, hash);
         if (q == NULL)
                 goto out_nomem;
 
@@ -257,37 +272,6 @@ out_nomem:
         return NULL;
 }
 
-/* Find the correct entry in the "incomplete datagrams" queue for
- * this IP datagram, and create new one, if nothing is found.
- */
-static inline struct ipq *ip_find(struct iphdr *iph, u32 user)
-{
-        __be16 id = iph->id;
-        __be32 saddr = iph->saddr;
-        __be32 daddr = iph->daddr;
-        __u8 protocol = iph->protocol;
-        unsigned int hash;
-        struct ipq *qp;
-        struct hlist_node *n;
-
-        read_lock(&ip4_frags.lock);
-        hash = ipqhashfn(id, saddr, daddr, protocol);
-        hlist_for_each_entry(qp, n, &ip4_frags.hash[hash], q.list) {
-                if (qp->id == id                &&
-                    qp->saddr == saddr  &&
-                    qp->daddr == daddr  &&
-                    qp->protocol == protocol &&
-                    qp->user == user) {
-                        atomic_inc(&qp->q.refcnt);
-                        read_unlock(&ip4_frags.lock);
-                        return qp;
-                }
-        }
-        read_unlock(&ip4_frags.lock);
-
-        return ip_frag_create(iph, user, hash);
-}
-
 /* Is the fragment too far ahead to be part of ipq? */
 static inline int ip_frag_too_far(struct ipq *qp)
 {
@@ -648,6 +632,7 @@ void __init ipfrag_init(void)
         ip4_frags.skb_free = NULL;
         ip4_frags.qsize = sizeof(struct ipq);
         ip4_frags.equal = ip4_frag_equal;
+        ip4_frags.match = ip4_frag_match;
         ip4_frags.frag_expire = ip_expire;
         inet_frags_init(&ip4_frags);
 }
diff --git a/net/ipv6/netfilter/nf_conntrack_reasm.c b/net/ipv6/netfilter/nf_conntrack_reasm.c
index 127d1d842786..bff63d79c644 100644
--- a/net/ipv6/netfilter/nf_conntrack_reasm.c
+++ b/net/ipv6/netfilter/nf_conntrack_reasm.c
@@ -176,18 +176,19 @@ out:
 
 /* Creation primitives. */
 
-static struct nf_ct_frag6_queue *
-nf_ct_frag6_create(unsigned int hash, __be32 id, struct in6_addr *src,
-                struct in6_addr *dst)
+static __inline__ struct nf_ct_frag6_queue *
+fq_find(__be32 id, struct in6_addr *src, struct in6_addr *dst)
 {
         struct inet_frag_queue *q;
         struct ip6_create_arg arg;
+        unsigned int hash;
 
         arg.id = id;
         arg.src = src;
         arg.dst = dst;
+        hash = ip6qhashfn(id, src, dst);
 
-        q = inet_frag_create(&nf_frags, &arg, hash);
+        q = inet_frag_find(&nf_frags, &arg, hash);
         if (q == NULL)
                 goto oom;
 
@@ -198,28 +199,6 @@ oom:
         return NULL;
 }
 
-static __inline__ struct nf_ct_frag6_queue *
-fq_find(__be32 id, struct in6_addr *src, struct in6_addr *dst)
-{
-        struct nf_ct_frag6_queue *fq;
-        struct hlist_node *n;
-        unsigned int hash = ip6qhashfn(id, src, dst);
-
-        read_lock(&nf_frags.lock);
-        hlist_for_each_entry(fq, n, &nf_frags.hash[hash], q.list) {
-                if (fq->id == id &&
-                    ipv6_addr_equal(src, &fq->saddr) &&
-                    ipv6_addr_equal(dst, &fq->daddr)) {
-                        atomic_inc(&fq->q.refcnt);
-                        read_unlock(&nf_frags.lock);
-                        return fq;
-                }
-        }
-        read_unlock(&nf_frags.lock);
-
-        return nf_ct_frag6_create(hash, id, src, dst);
-}
-
 
 static int nf_ct_frag6_queue(struct nf_ct_frag6_queue *fq, struct sk_buff *skb,
                              struct frag_hdr *fhdr, int nhoff)
@@ -706,6 +685,7 @@ 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.match = ip6_frag_match;
         nf_frags.equal = ip6_frag_equal;
         nf_frags.frag_expire = nf_ct_frag6_expire;
         inet_frags_init(&nf_frags);
diff --git a/net/ipv6/reassembly.c b/net/ipv6/reassembly.c
index ce8734028d94..11fffe791fc4 100644
--- a/net/ipv6/reassembly.c
+++ b/net/ipv6/reassembly.c
@@ -155,6 +155,18 @@ int ip6_frag_equal(struct inet_frag_queue *q1, struct inet_frag_queue *q2)
 }
 EXPORT_SYMBOL(ip6_frag_equal);
 
+int ip6_frag_match(struct inet_frag_queue *q, void *a)
+{
+        struct frag_queue *fq;
+        struct ip6_create_arg *arg = a;
+
+        fq = container_of(q, struct frag_queue, q);
+        return (fq->id == arg->id &&
+                        ipv6_addr_equal(&fq->saddr, arg->src) &&
+                        ipv6_addr_equal(&fq->daddr, arg->dst));
+}
+EXPORT_SYMBOL(ip6_frag_match);
+
 /* Memory Tracking Functions. */
 static inline void frag_kfree_skb(struct sk_buff *skb, int *work)
 {
@@ -245,20 +257,20 @@ out:
         fq_put(fq);
 }
 
-/* Creation primitives. */
-
-static struct frag_queue *
-ip6_frag_create(__be32 id, struct in6_addr *src, struct in6_addr *dst,
-                struct inet6_dev *idev, unsigned int hash)
+static __inline__ struct frag_queue *
+fq_find(__be32 id, struct in6_addr *src, struct in6_addr *dst,
+        struct inet6_dev *idev)
 {
         struct inet_frag_queue *q;
         struct ip6_create_arg arg;
+        unsigned int hash;
 
         arg.id = id;
         arg.src = src;
         arg.dst = dst;
+        hash = ip6qhashfn(id, src, dst);
 
-        q = inet_frag_create(&ip6_frags, &arg, hash);
+        q = inet_frag_find(&ip6_frags, &arg, hash);
         if (q == NULL)
                 goto oom;
 
@@ -269,31 +281,6 @@ oom:
         return NULL;
 }
 
-static __inline__ struct frag_queue *
-fq_find(__be32 id, struct in6_addr *src, struct in6_addr *dst,
-        struct inet6_dev *idev)
-{
-        struct frag_queue *fq;
-        struct hlist_node *n;
-        unsigned int hash;
-
-        read_lock(&ip6_frags.lock);
-        hash = ip6qhashfn(id, src, dst);
-        hlist_for_each_entry(fq, n, &ip6_frags.hash[hash], q.list) {
-                if (fq->id == id &&
-                    ipv6_addr_equal(src, &fq->saddr) &&
-                    ipv6_addr_equal(dst, &fq->daddr)) {
-                        atomic_inc(&fq->q.refcnt);
-                        read_unlock(&ip6_frags.lock);
-                        return fq;
-                }
-        }
-        read_unlock(&ip6_frags.lock);
-
-        return ip6_frag_create(id, src, dst, idev, hash);
-}
-
-
 static int ip6_frag_queue(struct frag_queue *fq, struct sk_buff *skb,
                            struct frag_hdr *fhdr, int nhoff)
 {
@@ -673,6 +660,7 @@ 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.match = ip6_frag_match;
         ip6_frags.equal = ip6_frag_equal;
         ip6_frags.frag_expire = ip6_frag_expire;
         inet_frags_init(&ip6_frags);