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823 lines
22 KiB
823 lines
22 KiB
/* |
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* An implementation of key value pair (KVP) functionality for Linux. |
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* |
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* |
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* Copyright (C) 2010, Novell, Inc. |
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* Author : K. Y. Srinivasan <[email protected]> |
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* |
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* This program is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 as published |
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* by the Free Software Foundation. |
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* |
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* This program is distributed in the hope that it will be useful, but |
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* WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or |
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* NON INFRINGEMENT. See the GNU General Public License for more |
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* details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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*/ |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#include <linux/net.h> |
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#include <linux/nls.h> |
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#include <linux/connector.h> |
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#include <linux/workqueue.h> |
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#include <linux/hyperv.h> |
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#include <asm/hyperv-tlfs.h> |
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|
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#include "hyperv_vmbus.h" |
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#include "hv_utils_transport.h" |
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|
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/* |
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* Pre win8 version numbers used in ws2008 and ws 2008 r2 (win7) |
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*/ |
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#define WS2008_SRV_MAJOR 1 |
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#define WS2008_SRV_MINOR 0 |
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#define WS2008_SRV_VERSION (WS2008_SRV_MAJOR << 16 | WS2008_SRV_MINOR) |
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#define WIN7_SRV_MAJOR 3 |
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#define WIN7_SRV_MINOR 0 |
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#define WIN7_SRV_VERSION (WIN7_SRV_MAJOR << 16 | WIN7_SRV_MINOR) |
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#define WIN8_SRV_MAJOR 4 |
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#define WIN8_SRV_MINOR 0 |
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#define WIN8_SRV_VERSION (WIN8_SRV_MAJOR << 16 | WIN8_SRV_MINOR) |
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#define KVP_VER_COUNT 3 |
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static const int kvp_versions[] = { |
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WIN8_SRV_VERSION, |
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WIN7_SRV_VERSION, |
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WS2008_SRV_VERSION |
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}; |
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#define FW_VER_COUNT 2 |
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static const int fw_versions[] = { |
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UTIL_FW_VERSION, |
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UTIL_WS2K8_FW_VERSION |
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}; |
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|
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/* |
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* Global state maintained for transaction that is being processed. For a class |
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* of integration services, including the "KVP service", the specified protocol |
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* is a "request/response" protocol which means that there can only be single |
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* outstanding transaction from the host at any given point in time. We use |
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* this to simplify memory management in this driver - we cache and process |
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* only one message at a time. |
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* |
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* While the request/response protocol is guaranteed by the host, we further |
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* ensure this by serializing packet processing in this driver - we do not |
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* read additional packets from the VMBUS until the current packet is fully |
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* handled. |
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*/ |
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|
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static struct { |
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int state; /* hvutil_device_state */ |
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int recv_len; /* number of bytes received. */ |
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struct hv_kvp_msg *kvp_msg; /* current message */ |
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struct vmbus_channel *recv_channel; /* chn we got the request */ |
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u64 recv_req_id; /* request ID. */ |
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} kvp_transaction; |
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/* |
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* This state maintains the version number registered by the daemon. |
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*/ |
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static int dm_reg_value; |
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static void kvp_send_key(struct work_struct *dummy); |
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static void kvp_respond_to_host(struct hv_kvp_msg *msg, int error); |
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static void kvp_timeout_func(struct work_struct *dummy); |
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static void kvp_host_handshake_func(struct work_struct *dummy); |
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static void kvp_register(int); |
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static DECLARE_DELAYED_WORK(kvp_timeout_work, kvp_timeout_func); |
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static DECLARE_DELAYED_WORK(kvp_host_handshake_work, kvp_host_handshake_func); |
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static DECLARE_WORK(kvp_sendkey_work, kvp_send_key); |
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static const char kvp_devname[] = "vmbus/hv_kvp"; |
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static u8 *recv_buffer; |
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static struct hvutil_transport *hvt; |
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/* |
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* Register the kernel component with the user-level daemon. |
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* As part of this registration, pass the LIC version number. |
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* This number has no meaning, it satisfies the registration protocol. |
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*/ |
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#define HV_DRV_VERSION "3.1" |
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|
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static void kvp_poll_wrapper(void *channel) |
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{ |
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/* Transaction is finished, reset the state here to avoid races. */ |
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kvp_transaction.state = HVUTIL_READY; |
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tasklet_schedule(&((struct vmbus_channel *)channel)->callback_event); |
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} |
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static void kvp_register_done(void) |
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{ |
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/* |
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* If we're still negotiating with the host cancel the timeout |
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* work to not poll the channel twice. |
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*/ |
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pr_debug("KVP: userspace daemon registered\n"); |
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cancel_delayed_work_sync(&kvp_host_handshake_work); |
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hv_poll_channel(kvp_transaction.recv_channel, kvp_poll_wrapper); |
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} |
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|
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static void |
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kvp_register(int reg_value) |
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{ |
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struct hv_kvp_msg *kvp_msg; |
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char *version; |
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kvp_msg = kzalloc(sizeof(*kvp_msg), GFP_KERNEL); |
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if (kvp_msg) { |
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version = kvp_msg->body.kvp_register.version; |
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kvp_msg->kvp_hdr.operation = reg_value; |
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strcpy(version, HV_DRV_VERSION); |
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hvutil_transport_send(hvt, kvp_msg, sizeof(*kvp_msg), |
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kvp_register_done); |
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kfree(kvp_msg); |
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} |
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} |
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static void kvp_timeout_func(struct work_struct *dummy) |
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{ |
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/* |
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* If the timer fires, the user-mode component has not responded; |
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* process the pending transaction. |
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*/ |
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kvp_respond_to_host(NULL, HV_E_FAIL); |
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hv_poll_channel(kvp_transaction.recv_channel, kvp_poll_wrapper); |
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} |
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static void kvp_host_handshake_func(struct work_struct *dummy) |
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{ |
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tasklet_schedule(&kvp_transaction.recv_channel->callback_event); |
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} |
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static int kvp_handle_handshake(struct hv_kvp_msg *msg) |
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{ |
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switch (msg->kvp_hdr.operation) { |
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case KVP_OP_REGISTER: |
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dm_reg_value = KVP_OP_REGISTER; |
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pr_info("KVP: IP injection functionality not available\n"); |
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pr_info("KVP: Upgrade the KVP daemon\n"); |
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break; |
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case KVP_OP_REGISTER1: |
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dm_reg_value = KVP_OP_REGISTER1; |
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break; |
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default: |
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pr_info("KVP: incompatible daemon\n"); |
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pr_info("KVP: KVP version: %d, Daemon version: %d\n", |
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KVP_OP_REGISTER1, msg->kvp_hdr.operation); |
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return -EINVAL; |
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} |
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/* |
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* We have a compatible daemon; complete the handshake. |
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*/ |
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pr_debug("KVP: userspace daemon ver. %d connected\n", |
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msg->kvp_hdr.operation); |
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kvp_register(dm_reg_value); |
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return 0; |
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} |
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/* |
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* Callback when data is received from user mode. |
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*/ |
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static int kvp_on_msg(void *msg, int len) |
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{ |
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struct hv_kvp_msg *message = (struct hv_kvp_msg *)msg; |
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struct hv_kvp_msg_enumerate *data; |
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int error = 0; |
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if (len < sizeof(*message)) |
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return -EINVAL; |
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/* |
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* If we are negotiating the version information |
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* with the daemon; handle that first. |
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*/ |
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if (kvp_transaction.state < HVUTIL_READY) { |
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return kvp_handle_handshake(message); |
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} |
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/* We didn't send anything to userspace so the reply is spurious */ |
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if (kvp_transaction.state < HVUTIL_USERSPACE_REQ) |
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return -EINVAL; |
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kvp_transaction.state = HVUTIL_USERSPACE_RECV; |
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/* |
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* Based on the version of the daemon, we propagate errors from the |
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* daemon differently. |
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*/ |
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data = &message->body.kvp_enum_data; |
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switch (dm_reg_value) { |
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case KVP_OP_REGISTER: |
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/* |
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* Null string is used to pass back error condition. |
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*/ |
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if (data->data.key[0] == 0) |
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error = HV_S_CONT; |
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break; |
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case KVP_OP_REGISTER1: |
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/* |
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* We use the message header information from |
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* the user level daemon to transmit errors. |
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*/ |
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error = message->error; |
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break; |
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} |
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/* |
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* Complete the transaction by forwarding the key value |
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* to the host. But first, cancel the timeout. |
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*/ |
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if (cancel_delayed_work_sync(&kvp_timeout_work)) { |
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kvp_respond_to_host(message, error); |
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hv_poll_channel(kvp_transaction.recv_channel, kvp_poll_wrapper); |
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} |
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return 0; |
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} |
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static int process_ob_ipinfo(void *in_msg, void *out_msg, int op) |
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{ |
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struct hv_kvp_msg *in = in_msg; |
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struct hv_kvp_ip_msg *out = out_msg; |
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int len; |
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switch (op) { |
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case KVP_OP_GET_IP_INFO: |
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/* |
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* Transform all parameters into utf16 encoding. |
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*/ |
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len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.ip_addr, |
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strlen((char *)in->body.kvp_ip_val.ip_addr), |
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UTF16_HOST_ENDIAN, |
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(wchar_t *)out->kvp_ip_val.ip_addr, |
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MAX_IP_ADDR_SIZE); |
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if (len < 0) |
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return len; |
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len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.sub_net, |
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strlen((char *)in->body.kvp_ip_val.sub_net), |
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UTF16_HOST_ENDIAN, |
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(wchar_t *)out->kvp_ip_val.sub_net, |
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MAX_IP_ADDR_SIZE); |
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if (len < 0) |
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return len; |
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len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.gate_way, |
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strlen((char *)in->body.kvp_ip_val.gate_way), |
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UTF16_HOST_ENDIAN, |
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(wchar_t *)out->kvp_ip_val.gate_way, |
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MAX_GATEWAY_SIZE); |
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if (len < 0) |
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return len; |
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len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.dns_addr, |
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strlen((char *)in->body.kvp_ip_val.dns_addr), |
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UTF16_HOST_ENDIAN, |
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(wchar_t *)out->kvp_ip_val.dns_addr, |
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MAX_IP_ADDR_SIZE); |
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if (len < 0) |
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return len; |
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len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.adapter_id, |
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strlen((char *)in->body.kvp_ip_val.adapter_id), |
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UTF16_HOST_ENDIAN, |
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(wchar_t *)out->kvp_ip_val.adapter_id, |
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MAX_ADAPTER_ID_SIZE); |
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if (len < 0) |
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return len; |
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out->kvp_ip_val.dhcp_enabled = |
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in->body.kvp_ip_val.dhcp_enabled; |
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out->kvp_ip_val.addr_family = |
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in->body.kvp_ip_val.addr_family; |
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} |
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return 0; |
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} |
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static void process_ib_ipinfo(void *in_msg, void *out_msg, int op) |
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{ |
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struct hv_kvp_ip_msg *in = in_msg; |
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struct hv_kvp_msg *out = out_msg; |
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switch (op) { |
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case KVP_OP_SET_IP_INFO: |
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/* |
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* Transform all parameters into utf8 encoding. |
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*/ |
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utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.ip_addr, |
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MAX_IP_ADDR_SIZE, |
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UTF16_LITTLE_ENDIAN, |
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(__u8 *)out->body.kvp_ip_val.ip_addr, |
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MAX_IP_ADDR_SIZE); |
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utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.sub_net, |
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MAX_IP_ADDR_SIZE, |
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UTF16_LITTLE_ENDIAN, |
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(__u8 *)out->body.kvp_ip_val.sub_net, |
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MAX_IP_ADDR_SIZE); |
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utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.gate_way, |
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MAX_GATEWAY_SIZE, |
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UTF16_LITTLE_ENDIAN, |
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(__u8 *)out->body.kvp_ip_val.gate_way, |
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MAX_GATEWAY_SIZE); |
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|
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utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.dns_addr, |
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MAX_IP_ADDR_SIZE, |
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UTF16_LITTLE_ENDIAN, |
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(__u8 *)out->body.kvp_ip_val.dns_addr, |
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MAX_IP_ADDR_SIZE); |
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|
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out->body.kvp_ip_val.dhcp_enabled = in->kvp_ip_val.dhcp_enabled; |
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fallthrough; |
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case KVP_OP_GET_IP_INFO: |
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utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.adapter_id, |
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MAX_ADAPTER_ID_SIZE, |
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UTF16_LITTLE_ENDIAN, |
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(__u8 *)out->body.kvp_ip_val.adapter_id, |
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MAX_ADAPTER_ID_SIZE); |
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|
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out->body.kvp_ip_val.addr_family = in->kvp_ip_val.addr_family; |
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} |
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} |
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|
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static void |
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kvp_send_key(struct work_struct *dummy) |
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{ |
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struct hv_kvp_msg *message; |
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struct hv_kvp_msg *in_msg; |
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__u8 operation = kvp_transaction.kvp_msg->kvp_hdr.operation; |
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__u8 pool = kvp_transaction.kvp_msg->kvp_hdr.pool; |
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__u32 val32; |
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__u64 val64; |
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int rc; |
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|
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/* The transaction state is wrong. */ |
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if (kvp_transaction.state != HVUTIL_HOSTMSG_RECEIVED) |
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return; |
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|
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message = kzalloc(sizeof(*message), GFP_KERNEL); |
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if (!message) |
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return; |
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|
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message->kvp_hdr.operation = operation; |
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message->kvp_hdr.pool = pool; |
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in_msg = kvp_transaction.kvp_msg; |
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|
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/* |
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* The key/value strings sent from the host are encoded in |
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* in utf16; convert it to utf8 strings. |
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* The host assures us that the utf16 strings will not exceed |
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* the max lengths specified. We will however, reserve room |
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* for the string terminating character - in the utf16s_utf8s() |
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* function we limit the size of the buffer where the converted |
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* string is placed to HV_KVP_EXCHANGE_MAX_*_SIZE -1 to guarantee |
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* that the strings can be properly terminated! |
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*/ |
|
|
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switch (message->kvp_hdr.operation) { |
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case KVP_OP_SET_IP_INFO: |
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process_ib_ipinfo(in_msg, message, KVP_OP_SET_IP_INFO); |
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break; |
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case KVP_OP_GET_IP_INFO: |
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/* |
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* We only need to pass on the info of operation, adapter_id |
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* and addr_family to the userland kvp daemon. |
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*/ |
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process_ib_ipinfo(in_msg, message, KVP_OP_GET_IP_INFO); |
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break; |
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case KVP_OP_SET: |
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switch (in_msg->body.kvp_set.data.value_type) { |
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case REG_SZ: |
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/* |
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* The value is a string - utf16 encoding. |
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*/ |
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message->body.kvp_set.data.value_size = |
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utf16s_to_utf8s( |
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(wchar_t *)in_msg->body.kvp_set.data.value, |
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in_msg->body.kvp_set.data.value_size, |
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UTF16_LITTLE_ENDIAN, |
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message->body.kvp_set.data.value, |
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HV_KVP_EXCHANGE_MAX_VALUE_SIZE - 1) + 1; |
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break; |
|
|
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case REG_U32: |
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/* |
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* The value is a 32 bit scalar. |
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* We save this as a utf8 string. |
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*/ |
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val32 = in_msg->body.kvp_set.data.value_u32; |
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message->body.kvp_set.data.value_size = |
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sprintf(message->body.kvp_set.data.value, |
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"%u", val32) + 1; |
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break; |
|
|
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case REG_U64: |
|
/* |
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* The value is a 64 bit scalar. |
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* We save this as a utf8 string. |
|
*/ |
|
val64 = in_msg->body.kvp_set.data.value_u64; |
|
message->body.kvp_set.data.value_size = |
|
sprintf(message->body.kvp_set.data.value, |
|
"%llu", val64) + 1; |
|
break; |
|
|
|
} |
|
|
|
/* |
|
* The key is always a string - utf16 encoding. |
|
*/ |
|
message->body.kvp_set.data.key_size = |
|
utf16s_to_utf8s( |
|
(wchar_t *)in_msg->body.kvp_set.data.key, |
|
in_msg->body.kvp_set.data.key_size, |
|
UTF16_LITTLE_ENDIAN, |
|
message->body.kvp_set.data.key, |
|
HV_KVP_EXCHANGE_MAX_KEY_SIZE - 1) + 1; |
|
|
|
break; |
|
|
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case KVP_OP_GET: |
|
message->body.kvp_get.data.key_size = |
|
utf16s_to_utf8s( |
|
(wchar_t *)in_msg->body.kvp_get.data.key, |
|
in_msg->body.kvp_get.data.key_size, |
|
UTF16_LITTLE_ENDIAN, |
|
message->body.kvp_get.data.key, |
|
HV_KVP_EXCHANGE_MAX_KEY_SIZE - 1) + 1; |
|
break; |
|
|
|
case KVP_OP_DELETE: |
|
message->body.kvp_delete.key_size = |
|
utf16s_to_utf8s( |
|
(wchar_t *)in_msg->body.kvp_delete.key, |
|
in_msg->body.kvp_delete.key_size, |
|
UTF16_LITTLE_ENDIAN, |
|
message->body.kvp_delete.key, |
|
HV_KVP_EXCHANGE_MAX_KEY_SIZE - 1) + 1; |
|
break; |
|
|
|
case KVP_OP_ENUMERATE: |
|
message->body.kvp_enum_data.index = |
|
in_msg->body.kvp_enum_data.index; |
|
break; |
|
} |
|
|
|
kvp_transaction.state = HVUTIL_USERSPACE_REQ; |
|
rc = hvutil_transport_send(hvt, message, sizeof(*message), NULL); |
|
if (rc) { |
|
pr_debug("KVP: failed to communicate to the daemon: %d\n", rc); |
|
if (cancel_delayed_work_sync(&kvp_timeout_work)) { |
|
kvp_respond_to_host(message, HV_E_FAIL); |
|
kvp_transaction.state = HVUTIL_READY; |
|
} |
|
} |
|
|
|
kfree(message); |
|
} |
|
|
|
/* |
|
* Send a response back to the host. |
|
*/ |
|
|
|
static void |
|
kvp_respond_to_host(struct hv_kvp_msg *msg_to_host, int error) |
|
{ |
|
struct hv_kvp_msg *kvp_msg; |
|
struct hv_kvp_exchg_msg_value *kvp_data; |
|
char *key_name; |
|
char *value; |
|
struct icmsg_hdr *icmsghdrp; |
|
int keylen = 0; |
|
int valuelen = 0; |
|
u32 buf_len; |
|
struct vmbus_channel *channel; |
|
u64 req_id; |
|
int ret; |
|
|
|
/* |
|
* Copy the global state for completing the transaction. Note that |
|
* only one transaction can be active at a time. |
|
*/ |
|
|
|
buf_len = kvp_transaction.recv_len; |
|
channel = kvp_transaction.recv_channel; |
|
req_id = kvp_transaction.recv_req_id; |
|
|
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icmsghdrp = (struct icmsg_hdr *) |
|
&recv_buffer[sizeof(struct vmbuspipe_hdr)]; |
|
|
|
if (channel->onchannel_callback == NULL) |
|
/* |
|
* We have raced with util driver being unloaded; |
|
* silently return. |
|
*/ |
|
return; |
|
|
|
icmsghdrp->status = error; |
|
|
|
/* |
|
* If the error parameter is set, terminate the host's enumeration |
|
* on this pool. |
|
*/ |
|
if (error) { |
|
/* |
|
* Something failed or we have timed out; |
|
* terminate the current host-side iteration. |
|
*/ |
|
goto response_done; |
|
} |
|
|
|
kvp_msg = (struct hv_kvp_msg *) |
|
&recv_buffer[sizeof(struct vmbuspipe_hdr) + |
|
sizeof(struct icmsg_hdr)]; |
|
|
|
switch (kvp_transaction.kvp_msg->kvp_hdr.operation) { |
|
case KVP_OP_GET_IP_INFO: |
|
ret = process_ob_ipinfo(msg_to_host, |
|
(struct hv_kvp_ip_msg *)kvp_msg, |
|
KVP_OP_GET_IP_INFO); |
|
if (ret < 0) |
|
icmsghdrp->status = HV_E_FAIL; |
|
|
|
goto response_done; |
|
case KVP_OP_SET_IP_INFO: |
|
goto response_done; |
|
case KVP_OP_GET: |
|
kvp_data = &kvp_msg->body.kvp_get.data; |
|
goto copy_value; |
|
|
|
case KVP_OP_SET: |
|
case KVP_OP_DELETE: |
|
goto response_done; |
|
|
|
default: |
|
break; |
|
} |
|
|
|
kvp_data = &kvp_msg->body.kvp_enum_data.data; |
|
key_name = msg_to_host->body.kvp_enum_data.data.key; |
|
|
|
/* |
|
* The windows host expects the key/value pair to be encoded |
|
* in utf16. Ensure that the key/value size reported to the host |
|
* will be less than or equal to the MAX size (including the |
|
* terminating character). |
|
*/ |
|
keylen = utf8s_to_utf16s(key_name, strlen(key_name), UTF16_HOST_ENDIAN, |
|
(wchar_t *) kvp_data->key, |
|
(HV_KVP_EXCHANGE_MAX_KEY_SIZE / 2) - 2); |
|
kvp_data->key_size = 2*(keylen + 1); /* utf16 encoding */ |
|
|
|
copy_value: |
|
value = msg_to_host->body.kvp_enum_data.data.value; |
|
valuelen = utf8s_to_utf16s(value, strlen(value), UTF16_HOST_ENDIAN, |
|
(wchar_t *) kvp_data->value, |
|
(HV_KVP_EXCHANGE_MAX_VALUE_SIZE / 2) - 2); |
|
kvp_data->value_size = 2*(valuelen + 1); /* utf16 encoding */ |
|
|
|
/* |
|
* If the utf8s to utf16s conversion failed; notify host |
|
* of the error. |
|
*/ |
|
if ((keylen < 0) || (valuelen < 0)) |
|
icmsghdrp->status = HV_E_FAIL; |
|
|
|
kvp_data->value_type = REG_SZ; /* all our values are strings */ |
|
|
|
response_done: |
|
icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION | ICMSGHDRFLAG_RESPONSE; |
|
|
|
vmbus_sendpacket(channel, recv_buffer, buf_len, req_id, |
|
VM_PKT_DATA_INBAND, 0); |
|
} |
|
|
|
/* |
|
* This callback is invoked when we get a KVP message from the host. |
|
* The host ensures that only one KVP transaction can be active at a time. |
|
* KVP implementation in Linux needs to forward the key to a user-mde |
|
* component to retrieve the corresponding value. Consequently, we cannot |
|
* respond to the host in the context of this callback. Since the host |
|
* guarantees that at most only one transaction can be active at a time, |
|
* we stash away the transaction state in a set of global variables. |
|
*/ |
|
|
|
void hv_kvp_onchannelcallback(void *context) |
|
{ |
|
struct vmbus_channel *channel = context; |
|
u32 recvlen; |
|
u64 requestid; |
|
|
|
struct hv_kvp_msg *kvp_msg; |
|
|
|
struct icmsg_hdr *icmsghdrp; |
|
int kvp_srv_version; |
|
static enum {NEGO_NOT_STARTED, |
|
NEGO_IN_PROGRESS, |
|
NEGO_FINISHED} host_negotiatied = NEGO_NOT_STARTED; |
|
|
|
if (kvp_transaction.state < HVUTIL_READY) { |
|
/* |
|
* If userspace daemon is not connected and host is asking |
|
* us to negotiate we need to delay to not lose messages. |
|
* This is important for Failover IP setting. |
|
*/ |
|
if (host_negotiatied == NEGO_NOT_STARTED) { |
|
host_negotiatied = NEGO_IN_PROGRESS; |
|
schedule_delayed_work(&kvp_host_handshake_work, |
|
HV_UTIL_NEGO_TIMEOUT * HZ); |
|
} |
|
return; |
|
} |
|
if (kvp_transaction.state > HVUTIL_READY) |
|
return; |
|
|
|
if (vmbus_recvpacket(channel, recv_buffer, HV_HYP_PAGE_SIZE * 4, &recvlen, &requestid)) { |
|
pr_err_ratelimited("KVP request received. Could not read into recv buf\n"); |
|
return; |
|
} |
|
|
|
if (!recvlen) |
|
return; |
|
|
|
/* Ensure recvlen is big enough to read header data */ |
|
if (recvlen < ICMSG_HDR) { |
|
pr_err_ratelimited("KVP request received. Packet length too small: %d\n", |
|
recvlen); |
|
return; |
|
} |
|
|
|
icmsghdrp = (struct icmsg_hdr *)&recv_buffer[sizeof(struct vmbuspipe_hdr)]; |
|
|
|
if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) { |
|
if (vmbus_prep_negotiate_resp(icmsghdrp, |
|
recv_buffer, recvlen, |
|
fw_versions, FW_VER_COUNT, |
|
kvp_versions, KVP_VER_COUNT, |
|
NULL, &kvp_srv_version)) { |
|
pr_info("KVP IC version %d.%d\n", |
|
kvp_srv_version >> 16, |
|
kvp_srv_version & 0xFFFF); |
|
} |
|
} else if (icmsghdrp->icmsgtype == ICMSGTYPE_KVPEXCHANGE) { |
|
/* |
|
* recvlen is not checked against sizeof(struct kvp_msg) because kvp_msg contains |
|
* a union of structs and the msg type received is not known. Code using this |
|
* struct should provide validation when accessing its fields. |
|
*/ |
|
kvp_msg = (struct hv_kvp_msg *)&recv_buffer[ICMSG_HDR]; |
|
|
|
/* |
|
* Stash away this global state for completing the |
|
* transaction; note transactions are serialized. |
|
*/ |
|
|
|
kvp_transaction.recv_len = recvlen; |
|
kvp_transaction.recv_req_id = requestid; |
|
kvp_transaction.kvp_msg = kvp_msg; |
|
|
|
if (kvp_transaction.state < HVUTIL_READY) { |
|
/* Userspace is not registered yet */ |
|
kvp_respond_to_host(NULL, HV_E_FAIL); |
|
return; |
|
} |
|
kvp_transaction.state = HVUTIL_HOSTMSG_RECEIVED; |
|
|
|
/* |
|
* Get the information from the |
|
* user-mode component. |
|
* component. This transaction will be |
|
* completed when we get the value from |
|
* the user-mode component. |
|
* Set a timeout to deal with |
|
* user-mode not responding. |
|
*/ |
|
schedule_work(&kvp_sendkey_work); |
|
schedule_delayed_work(&kvp_timeout_work, |
|
HV_UTIL_TIMEOUT * HZ); |
|
|
|
return; |
|
|
|
} else { |
|
pr_err_ratelimited("KVP request received. Invalid msg type: %d\n", |
|
icmsghdrp->icmsgtype); |
|
return; |
|
} |
|
|
|
icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION |
|
| ICMSGHDRFLAG_RESPONSE; |
|
|
|
vmbus_sendpacket(channel, recv_buffer, |
|
recvlen, requestid, |
|
VM_PKT_DATA_INBAND, 0); |
|
|
|
host_negotiatied = NEGO_FINISHED; |
|
hv_poll_channel(kvp_transaction.recv_channel, kvp_poll_wrapper); |
|
} |
|
|
|
static void kvp_on_reset(void) |
|
{ |
|
if (cancel_delayed_work_sync(&kvp_timeout_work)) |
|
kvp_respond_to_host(NULL, HV_E_FAIL); |
|
kvp_transaction.state = HVUTIL_DEVICE_INIT; |
|
} |
|
|
|
int |
|
hv_kvp_init(struct hv_util_service *srv) |
|
{ |
|
recv_buffer = srv->recv_buffer; |
|
kvp_transaction.recv_channel = srv->channel; |
|
|
|
/* |
|
* When this driver loads, the user level daemon that |
|
* processes the host requests may not yet be running. |
|
* Defer processing channel callbacks until the daemon |
|
* has registered. |
|
*/ |
|
kvp_transaction.state = HVUTIL_DEVICE_INIT; |
|
|
|
hvt = hvutil_transport_init(kvp_devname, CN_KVP_IDX, CN_KVP_VAL, |
|
kvp_on_msg, kvp_on_reset); |
|
if (!hvt) |
|
return -EFAULT; |
|
|
|
return 0; |
|
} |
|
|
|
static void hv_kvp_cancel_work(void) |
|
{ |
|
cancel_delayed_work_sync(&kvp_host_handshake_work); |
|
cancel_delayed_work_sync(&kvp_timeout_work); |
|
cancel_work_sync(&kvp_sendkey_work); |
|
} |
|
|
|
int hv_kvp_pre_suspend(void) |
|
{ |
|
struct vmbus_channel *channel = kvp_transaction.recv_channel; |
|
|
|
tasklet_disable(&channel->callback_event); |
|
|
|
/* |
|
* If there is a pending transtion, it's unnecessary to tell the host |
|
* that the transaction will fail, because that is implied when |
|
* util_suspend() calls vmbus_close() later. |
|
*/ |
|
hv_kvp_cancel_work(); |
|
|
|
/* |
|
* Forece the state to READY to handle the ICMSGTYPE_NEGOTIATE message |
|
* later. The user space daemon may go out of order and its write() |
|
* may fail with EINVAL: this doesn't matter since the daemon will |
|
* reset the device by closing and re-opening it. |
|
*/ |
|
kvp_transaction.state = HVUTIL_READY; |
|
return 0; |
|
} |
|
|
|
int hv_kvp_pre_resume(void) |
|
{ |
|
struct vmbus_channel *channel = kvp_transaction.recv_channel; |
|
|
|
tasklet_enable(&channel->callback_event); |
|
|
|
return 0; |
|
} |
|
|
|
void hv_kvp_deinit(void) |
|
{ |
|
kvp_transaction.state = HVUTIL_DEVICE_DYING; |
|
|
|
hv_kvp_cancel_work(); |
|
|
|
hvutil_transport_destroy(hvt); |
|
}
|
|
|