[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>

1 files changed, 19 insertions, 31 deletions

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);