blob: aa0d79eb9e5e315072b740226b510c0b485b84c8 [file] [log] [blame]
/*
* Copyright (C) 2016 The Android Open Source Project
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <interface/storage/storage.h>
#include <trusty/rpmb.h>
#include <trusty/trusty_ipc.h>
#include <trusty/util.h>
#define LOCAL_LOG 0
static bool initialized;
/* Address of rpmb device */
static void* proxy_rpmb;
struct trusty_ipc_chan proxy_chan;
struct storage_msg req_msg;
static uint8_t req_buf[4096];
static uint8_t read_buf[4096];
/*
* Read RPMB request from storage service. Writes message to @msg
* and @req.
*
* @chan: proxy ipc channel
* @msg: address of storage message header
* @req: address of storage message request
* @req_len: length of req in bytes
*/
static int proxy_read_request(struct trusty_ipc_chan* chan,
struct storage_msg* msg,
void* req,
size_t req_len) {
int rc;
struct trusty_ipc_iovec req_iovs[2] = {
{.base = msg, .len = sizeof(*msg)},
{.base = req, .len = req_len},
};
rc = trusty_ipc_recv(chan, req_iovs, 2, false);
if (rc < 0) {
/* recv message failed */
trusty_error("%s: failed (%d) to recv request\n", __func__, rc);
return rc;
}
if ((size_t)rc < sizeof(*msg)) {
/* malformed message */
trusty_error("%s: malformed request (%zu)\n", __func__, (size_t)rc);
return TRUSTY_ERR_GENERIC;
}
return rc - sizeof(*msg); /* return payload size */
}
/*
* Send RPMB response to storage service
*
* @chan: proxy ipc channel
* @msg: address of storage message header
* @resp: address of storage message response
* @resp_len: length of resp in bytes
*/
static int proxy_send_response(struct trusty_ipc_chan* chan,
struct storage_msg* msg,
void* resp,
size_t resp_len) {
struct trusty_ipc_iovec resp_iovs[2] = {{.base = msg, .len = sizeof(*msg)},
{.base = resp, .len = resp_len}};
msg->cmd |= STORAGE_RESP_BIT;
return trusty_ipc_send(chan, resp_iovs, resp ? 2 : 1, false);
}
/*
* Executes the RPMB request at @r, sends response to storage service.
*
* @chan: proxy ipc channel
* @msg: address of storage message header
* @r: address of storage message request
* @req_len: length of resp in bytes
*/
static int proxy_handle_rpmb(struct trusty_ipc_chan* chan,
struct storage_msg* msg,
const void* r,
size_t req_len) {
int rc;
size_t exp_len;
const void* write_data = NULL;
const void* rel_write_data = NULL;
const struct storage_rpmb_send_req* req = r;
if (req_len < sizeof(req)) {
msg->result = STORAGE_ERR_NOT_VALID;
goto err_response;
}
exp_len = sizeof(*req) + req->reliable_write_size + req->write_size;
if (req_len != exp_len) {
trusty_error(
"%s: malformed rpmb request: invalid length (%zu != %zu)\n",
__func__, req_len, exp_len);
msg->result = STORAGE_ERR_NOT_VALID;
goto err_response;
}
if (req->reliable_write_size) {
if ((req->reliable_write_size % MMC_BLOCK_SIZE) != 0) {
trusty_error("%s: invalid reliable write size %u\n", __func__,
req->reliable_write_size);
msg->result = STORAGE_ERR_NOT_VALID;
goto err_response;
}
rel_write_data = req->payload;
}
if (req->write_size) {
if ((req->write_size % MMC_BLOCK_SIZE) != 0) {
trusty_error("%: invalid write size %u\n", __func__,
req->write_size);
msg->result = STORAGE_ERR_NOT_VALID;
goto err_response;
}
write_data = req->payload + req->reliable_write_size;
}
if (req->read_size) {
if (req->read_size % MMC_BLOCK_SIZE != 0 ||
req->read_size > sizeof(read_buf)) {
trusty_error("%s: invalid read size %u\n", __func__,
req->read_size);
msg->result = STORAGE_ERR_NOT_VALID;
goto err_response;
}
}
/* execute rpmb command */
rc = rpmb_storage_send(proxy_rpmb, rel_write_data, req->reliable_write_size,
write_data, req->write_size, read_buf,
req->read_size);
if (rc) {
trusty_error("%s: rpmb_storage_send failed: %d\n", __func__, rc);
msg->result = STORAGE_ERR_GENERIC;
goto err_response;
}
if (msg->flags & STORAGE_MSG_FLAG_POST_COMMIT) {
/*
* Nothing todo for post msg commit request as MMC_IOC_MULTI_CMD
* is fully synchronous in this implementation.
*/
}
msg->result = STORAGE_NO_ERROR;
return proxy_send_response(chan, msg, read_buf, req->read_size);
err_response:
return proxy_send_response(chan, msg, NULL, 0);
}
/*
* Handles storage request.
*
* @chan: proxy ipc channel
* @msg: address of storage message header
* @req: address of storage message request
* @req_len: length of resp in bytes
*/
static int proxy_handle_req(struct trusty_ipc_chan* chan,
struct storage_msg* msg,
const void* req,
size_t req_len) {
int rc;
if (msg->flags & STORAGE_MSG_FLAG_PRE_COMMIT) {
/* nothing to do */
}
switch (msg->cmd) {
case STORAGE_RPMB_SEND:
rc = proxy_handle_rpmb(chan, msg, req, req_len);
break;
case STORAGE_FILE_DELETE:
case STORAGE_FILE_OPEN:
case STORAGE_FILE_CLOSE:
case STORAGE_FILE_WRITE:
case STORAGE_FILE_READ:
case STORAGE_FILE_GET_SIZE:
case STORAGE_FILE_SET_SIZE:
/* Bulk filesystem is not supported */
msg->result = STORAGE_ERR_UNIMPLEMENTED;
rc = proxy_send_response(chan, msg, NULL, 0);
break;
default:
msg->result = STORAGE_ERR_UNIMPLEMENTED;
rc = proxy_send_response(chan, msg, NULL, 0);
}
return rc;
}
/*
* Invalidates @chan on hangup event
*
* @chan: proxy ipc channel
*/
static int proxy_on_disconnect(struct trusty_ipc_chan* chan) {
trusty_assert(chan);
trusty_debug("%s: closed by peer\n", __func__);
chan->handle = INVALID_IPC_HANDLE;
return TRUSTY_EVENT_HANDLED;
}
/*
* Handles received storage message on message event
*
* @chan: proxy ipc channel
*/
static int proxy_on_message(struct trusty_ipc_chan* chan) {
int rc;
trusty_assert(chan);
/* read request */
rc = proxy_read_request(chan, &req_msg, req_buf, sizeof(req_buf));
if (rc < 0) {
trusty_error("%s: failed (%d) to read request\n", __func__, rc);
trusty_ipc_close(chan);
return rc;
}
/* handle it and send reply */
rc = proxy_handle_req(chan, &req_msg, req_buf, rc);
if (rc < 0) {
trusty_error("%s: failed (%d) to handle request\n", __func__, rc);
trusty_ipc_close(chan);
return rc;
}
return TRUSTY_EVENT_HANDLED;
}
static struct trusty_ipc_ops proxy_ops = {
.on_message = proxy_on_message,
.on_disconnect = proxy_on_disconnect,
};
/*
* Initialize RPMB storage proxy
*/
int rpmb_storage_proxy_init(struct trusty_ipc_dev* dev, void* rpmb_dev) {
int rc;
trusty_assert(dev);
trusty_assert(!initialized);
/* attach rpmb device */
proxy_rpmb = rpmb_dev;
/* init ipc channel */
trusty_ipc_chan_init(&proxy_chan, dev);
/* connect to proxy service and wait for connect to complete */
rc = trusty_ipc_connect(&proxy_chan, STORAGE_DISK_PROXY_PORT, true);
if (rc < 0) {
trusty_error("%s: failed (%d) to connect to '%s'\n", __func__, rc,
STORAGE_DISK_PROXY_PORT);
return rc;
}
/* override default ops */
proxy_chan.ops = &proxy_ops;
do {
/* Check for RPMB events */
rc = trusty_ipc_poll_for_event(proxy_chan.dev);
if (rc < 0) {
trusty_error("%s: failed (%d) to get rpmb event\n", __func__, rc);
return rc;
}
if (proxy_chan.handle == INVALID_IPC_HANDLE) {
trusty_error("%s: unexpected proxy channel close\n", __func__);
return TRUSTY_ERR_CHANNEL_CLOSED;
}
} while (rc != TRUSTY_EVENT_NONE);
/* mark as initialized */
initialized = true;
return TRUSTY_ERR_NONE;
}
void rpmb_storage_proxy_shutdown(struct trusty_ipc_dev* dev) {
trusty_assert(initialized);
/* close channel */
trusty_ipc_close(&proxy_chan);
initialized = false;
}