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