-int nf_conntrack_register_cache(u_int32_t features, const char *name,
- size_t size)
-{
- int ret = 0;
- char *cache_name;
- struct kmem_cache *cachep;
-
- DEBUGP("nf_conntrack_register_cache: features=0x%x, name=%s, size=%d\n",
- features, name, size);
-
- if (features < NF_CT_F_BASIC || features >= NF_CT_F_NUM) {
- DEBUGP("nf_conntrack_register_cache: invalid features.: 0x%x\n",
- features);
- return -EINVAL;
- }
-
- mutex_lock(&nf_ct_cache_mutex);
-
- write_lock_bh(&nf_ct_cache_lock);
- /* e.g: multiple helpers are loaded */
- if (nf_ct_cache[features].use > 0) {
- DEBUGP("nf_conntrack_register_cache: already resisterd.\n");
- if ((!strncmp(nf_ct_cache[features].name, name,
- NF_CT_FEATURES_NAMELEN))
- && nf_ct_cache[features].size == size) {
- DEBUGP("nf_conntrack_register_cache: reusing.\n");
- nf_ct_cache[features].use++;
- ret = 0;
- } else
- ret = -EBUSY;
-
- write_unlock_bh(&nf_ct_cache_lock);
- mutex_unlock(&nf_ct_cache_mutex);
- return ret;
- }
- write_unlock_bh(&nf_ct_cache_lock);
-
- /*
- * The memory space for name of slab cache must be alive until
- * cache is destroyed.
- */
- cache_name = kmalloc(sizeof(char)*NF_CT_FEATURES_NAMELEN, GFP_ATOMIC);
- if (cache_name == NULL) {
- DEBUGP("nf_conntrack_register_cache: can't alloc cache_name\n");
- ret = -ENOMEM;
- goto out_up_mutex;
- }
-
- if (strlcpy(cache_name, name, NF_CT_FEATURES_NAMELEN)
- >= NF_CT_FEATURES_NAMELEN) {
- printk("nf_conntrack_register_cache: name too long\n");
- ret = -EINVAL;
- goto out_free_name;
- }
-
- cachep = kmem_cache_create(cache_name, size, 0, 0,
- NULL, NULL);
- if (!cachep) {
- printk("nf_conntrack_register_cache: Can't create slab cache "
- "for the features = 0x%x\n", features);
- ret = -ENOMEM;
- goto out_free_name;
- }
-
- write_lock_bh(&nf_ct_cache_lock);
- nf_ct_cache[features].use = 1;
- nf_ct_cache[features].size = size;
- nf_ct_cache[features].cachep = cachep;
- nf_ct_cache[features].name = cache_name;
- write_unlock_bh(&nf_ct_cache_lock);
-
- goto out_up_mutex;
-
-out_free_name:
- kfree(cache_name);
-out_up_mutex:
- mutex_unlock(&nf_ct_cache_mutex);
- return ret;
-}
-EXPORT_SYMBOL_GPL(nf_conntrack_register_cache);
-
-/* FIXME: In the current, only nf_conntrack_cleanup() can call this function. */
-void nf_conntrack_unregister_cache(u_int32_t features)
-{
- struct kmem_cache *cachep;
- char *name;
-
- /*
- * This assures that kmem_cache_create() isn't called before destroying
- * slab cache.
- */
- DEBUGP("nf_conntrack_unregister_cache: 0x%04x\n", features);
- mutex_lock(&nf_ct_cache_mutex);
-
- write_lock_bh(&nf_ct_cache_lock);
- if (--nf_ct_cache[features].use > 0) {
- write_unlock_bh(&nf_ct_cache_lock);
- mutex_unlock(&nf_ct_cache_mutex);
- return;
- }
- cachep = nf_ct_cache[features].cachep;
- name = nf_ct_cache[features].name;
- nf_ct_cache[features].cachep = NULL;
- nf_ct_cache[features].name = NULL;
- nf_ct_cache[features].size = 0;
- write_unlock_bh(&nf_ct_cache_lock);
-
- synchronize_net();
-
- kmem_cache_destroy(cachep);
- kfree(name);
-
- mutex_unlock(&nf_ct_cache_mutex);
-}
-EXPORT_SYMBOL_GPL(nf_conntrack_unregister_cache);
-