/**
* Add cache to cache manager
* @arg mngr Cache manager.
* @arg cache Cache to be added to cache manager
* @arg cb Function to be called upon changes.
* @arg data Argument passed on to change callback
*
* Adds cache to the manager. The operation will trigger a full
* dump request from the kernel to initially fill the contents
* of the cache. The manager will subscribe to the notification group
* of the cache and keep track of any further changes.
*
* The user is responsible for calling nl_cache_mngr_poll() or monitor
* the socket and call nl_cache_mngr_data_ready() to allow the library
* to process netlink notification events.
*
* @see nl_cache_mngr_poll()
* @see nl_cache_mngr_data_ready()
*
* @return 0 on success or a negative error code.
* @return -NLE_PROTO_MISMATCH Protocol mismatch between cache manager and
* cache type
* @return -NLE_OPNOTSUPP Cache type does not support updates
* @return -NLE_EXIST Cache of this type already being managed
*/
int nl_cache_mngr_add_cache(struct nl_cache_mngr *mngr, struct nl_cache *cache,
change_func_t cb, void *data)
{
struct nl_cache_ops *ops;
struct nl_af_group *grp;
int err, i;
ops = cache->c_ops;
if (!ops)
return -NLE_INVAL;
if (ops->co_protocol != mngr->cm_protocol)
return -NLE_PROTO_MISMATCH;
if (ops->co_groups == NULL)
return -NLE_OPNOTSUPP;
for (i = 0; i < mngr->cm_nassocs; i++)
if (mngr->cm_assocs[i].ca_cache &&
mngr->cm_assocs[i].ca_cache->c_ops == ops)
return -NLE_EXIST;
retry:
for (i = 0; i < mngr->cm_nassocs; i++)
if (!mngr->cm_assocs[i].ca_cache)
break;
if (i >= mngr->cm_nassocs) {
mngr->cm_nassocs += NASSOC_EXPAND;
mngr->cm_assocs = realloc(mngr->cm_assocs,
mngr->cm_nassocs *
sizeof(struct nl_cache_assoc));
if (mngr->cm_assocs == NULL)
return -NLE_NOMEM;
memset(mngr->cm_assocs + (mngr->cm_nassocs - NASSOC_EXPAND), 0,
NASSOC_EXPAND * sizeof(struct nl_cache_assoc));
NL_DBG(1, "Increased capacity of cache manager %p " \
"to %d\n", mngr, mngr->cm_nassocs);
goto retry;
}
for (grp = ops->co_groups; grp->ag_group; grp++) {
err = nl_socket_add_membership(mngr->cm_sock, grp->ag_group);
if (err < 0)
return err;
}
err = nl_cache_refill(mngr->cm_sync_sock, cache);
if (err < 0)
goto errout_drop_membership;
mngr->cm_assocs[i].ca_cache = cache;
mngr->cm_assocs[i].ca_change = cb;
mngr->cm_assocs[i].ca_change_data = data;
if (mngr->cm_flags & NL_AUTO_PROVIDE)
nl_cache_mngt_provide(cache);
NL_DBG(1, "Added cache %p <%s> to cache manager %p\n",
cache, nl_cache_name(cache), mngr);
return 0;
errout_drop_membership:
for (grp = ops->co_groups; grp->ag_group; grp++)
nl_socket_drop_membership(mngr->cm_sock, grp->ag_group);
return err;
}
/**
* Add cache responsibility to cache manager
* @arg mngr Cache manager.
* @arg name Name of cache to keep track of
* @arg cb Function to be called upon changes.
* @arg data Argument passed on to change callback
* @arg result Pointer to store added cache.
*
* Allocates a new cache of the specified type and adds it to the manager.
* The operation will trigger a full dump request from the kernel to
* initially fill the contents of the cache. The manager will subscribe
* to the notification group of the cache to keep track of any further
* changes.
*
* @return 0 on success or a negative error code.
*/
int nl_cache_mngr_add(struct nl_cache_mngr *mngr, const char *name,
change_func_t cb, void *data, struct nl_cache **result)
{
struct nl_cache_ops *ops;
struct nl_cache *cache;
struct nl_af_group *grp;
int err, i;
ops = nl_cache_ops_lookup(name);
if (!ops)
return -NLE_NOCACHE;
if (ops->co_protocol != mngr->cm_protocol)
return -NLE_PROTO_MISMATCH;
if (ops->co_groups == NULL)
return -NLE_OPNOTSUPP;
for (i = 0; i < mngr->cm_nassocs; i++)
if (mngr->cm_assocs[i].ca_cache &&
mngr->cm_assocs[i].ca_cache->c_ops == ops)
return -NLE_EXIST;
retry:
for (i = 0; i < mngr->cm_nassocs; i++)
if (!mngr->cm_assocs[i].ca_cache)
break;
if (i >= mngr->cm_nassocs) {
mngr->cm_nassocs += 16;
mngr->cm_assocs = realloc(mngr->cm_assocs,
mngr->cm_nassocs *
sizeof(struct nl_cache_assoc));
if (mngr->cm_assocs == NULL)
return -NLE_NOMEM;
else {
NL_DBG(1, "Increased capacity of cache manager %p " \
"to %d\n", mngr, mngr->cm_nassocs);
goto retry;
}
}
cache = nl_cache_alloc(ops);
if (!cache)
return -NLE_NOMEM;
for (grp = ops->co_groups; grp->ag_group; grp++) {
err = nl_socket_add_membership(mngr->cm_handle, grp->ag_group);
if (err < 0)
goto errout_free_cache;
}
err = nl_cache_refill(mngr->cm_handle, cache);
if (err < 0)
goto errout_drop_membership;
mngr->cm_assocs[i].ca_cache = cache;
mngr->cm_assocs[i].ca_change = cb;
mngr->cm_assocs[i].ca_change_data = data;
if (mngr->cm_flags & NL_AUTO_PROVIDE)
nl_cache_mngt_provide(cache);
NL_DBG(1, "Added cache %p <%s> to cache manager %p\n",
cache, nl_cache_name(cache), mngr);
*result = cache;
return 0;
errout_drop_membership:
for (grp = ops->co_groups; grp->ag_group; grp++)
nl_socket_drop_membership(mngr->cm_handle, grp->ag_group);
errout_free_cache:
nl_cache_free(cache);
return err;
}
