static int kvp_on_msg(void *msg, int len)
{
struct hv_kvp_msg *message = (struct hv_kvp_msg *)msg;
struct hv_kvp_msg_enumerate *data;
int error = 0;
if (len < sizeof(*message))
return -EINVAL;
/*
* If we are negotiating the version information
* with the daemon; handle that first.
*/
if (kvp_transaction.state < HVUTIL_READY) {
return kvp_handle_handshake(message);
}
/* We didn't send anything to userspace so the reply is spurious */
if (kvp_transaction.state < HVUTIL_USERSPACE_REQ)
return -EINVAL;
kvp_transaction.state = HVUTIL_USERSPACE_RECV;
/*
* Based on the version of the daemon, we propagate errors from the
* daemon differently.
*/
data = &message->body.kvp_enum_data;
switch (dm_reg_value) {
case KVP_OP_REGISTER:
/*
* Null string is used to pass back error condition.
*/
if (data->data.key[0] == 0)
error = HV_S_CONT;
break;
case KVP_OP_REGISTER1:
/*
* We use the message header information from
* the user level daemon to transmit errors.
*/
error = message->error;
break;
}
/*
* Complete the transaction by forwarding the key value
* to the host. But first, cancel the timeout.
*/
if (cancel_delayed_work_sync(&kvp_timeout_work)) {
kvp_respond_to_host(message, error);
hv_poll_channel(kvp_transaction.recv_channel, kvp_poll_wrapper);
}
return 0;
}
static void
kvp_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
{
struct hv_kvp_msg *message;
struct hv_kvp_msg_enumerate *data;
int error = 0;
message = (struct hv_kvp_msg *)msg->data;
/*
* If we are negotiating the version information
* with the daemon; handle that first.
*/
if (in_hand_shake) {
if (kvp_handle_handshake(message))
in_hand_shake = false;
return;
}
/*
* Based on the version of the daemon, we propagate errors from the
* daemon differently.
*/
data = &message->body.kvp_enum_data;
switch (dm_reg_value) {
case KVP_OP_REGISTER:
/*
* Null string is used to pass back error condition.
*/
if (data->data.key[0] == 0)
error = HV_S_CONT;
break;
case KVP_OP_REGISTER1:
/*
* We use the message header information from
* the user level daemon to transmit errors.
*/
error = message->error;
break;
}
/*
* Complete the transaction by forwarding the key value
* to the host. But first, cancel the timeout.
*/
if (cancel_delayed_work_sync(&kvp_work))
kvp_respond_to_host(message, error);
}
