1 files changed, 47 insertions, 0 deletions
diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
index c440de998910..74e64aad5114 100644
--- a/net/ipv4/inet_hashtables.c
+++ b/net/ipv4/inet_hashtables.c
@@ -1145,3 +1145,50 @@ int inet_ehash_locks_alloc(struct inet_hashinfo *hashinfo)
 	return 0;
 }
 EXPORT_SYMBOL_GPL(inet_ehash_locks_alloc);
+
+struct inet_hashinfo *inet_pernet_hashinfo_alloc(struct inet_hashinfo *hashinfo,
+						 unsigned int ehash_entries)
+{
+	struct inet_hashinfo *new_hashinfo;
+	int i;
+
+	new_hashinfo = kmemdup(hashinfo, sizeof(*hashinfo), GFP_KERNEL);
+	if (!new_hashinfo)
+		goto err;
+
+	new_hashinfo->ehash = vmalloc_huge(ehash_entries * sizeof(struct inet_ehash_bucket),
+					   GFP_KERNEL_ACCOUNT);
+	if (!new_hashinfo->ehash)
+		goto free_hashinfo;
+
+	new_hashinfo->ehash_mask = ehash_entries - 1;
+
+	if (inet_ehash_locks_alloc(new_hashinfo))
+		goto free_ehash;
+
+	for (i = 0; i < ehash_entries; i++)
+		INIT_HLIST_NULLS_HEAD(&new_hashinfo->ehash[i].chain, i);
+
+	new_hashinfo->pernet = true;
+
+	return new_hashinfo;
+
+free_ehash:
+	vfree(new_hashinfo->ehash);
+free_hashinfo:
+	kfree(new_hashinfo);
+err:
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(inet_pernet_hashinfo_alloc);
+
+void inet_pernet_hashinfo_free(struct inet_hashinfo *hashinfo)
+{
+	if (!hashinfo->pernet)
+		return;
+
+	inet_ehash_locks_free(hashinfo);
+	vfree(hashinfo->ehash);
+	kfree(hashinfo);
+}
+EXPORT_SYMBOL_GPL(inet_pernet_hashinfo_free);