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freebsd/usr.sbin/iscsid/pdu.c
Pedro F. Giffuni 1de7b4b805 various: general adoption of SPDX licensing ID tags.
Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

No functional change intended.
2017-11-27 15:37:16 +00:00

311 lines
7.0 KiB
C

/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2012 The FreeBSD Foundation
* All rights reserved.
*
* This software was developed by Edward Tomasz Napierala under sponsorship
* from the FreeBSD Foundation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <sys/uio.h>
#include <assert.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "iscsid.h"
#include "iscsi_proto.h"
#ifdef ICL_KERNEL_PROXY
#include <sys/ioctl.h>
#endif
static int
pdu_ahs_length(const struct pdu *pdu)
{
return (pdu->pdu_bhs->bhs_total_ahs_len * 4);
}
static int
pdu_data_segment_length(const struct pdu *pdu)
{
uint32_t len = 0;
len += pdu->pdu_bhs->bhs_data_segment_len[0];
len <<= 8;
len += pdu->pdu_bhs->bhs_data_segment_len[1];
len <<= 8;
len += pdu->pdu_bhs->bhs_data_segment_len[2];
return (len);
}
static void
pdu_set_data_segment_length(struct pdu *pdu, uint32_t len)
{
pdu->pdu_bhs->bhs_data_segment_len[2] = len;
pdu->pdu_bhs->bhs_data_segment_len[1] = len >> 8;
pdu->pdu_bhs->bhs_data_segment_len[0] = len >> 16;
}
struct pdu *
pdu_new(struct connection *conn)
{
struct pdu *pdu;
pdu = calloc(1, sizeof(*pdu));
if (pdu == NULL)
log_err(1, "calloc");
pdu->pdu_bhs = calloc(1, sizeof(*pdu->pdu_bhs));
if (pdu->pdu_bhs == NULL)
log_err(1, "calloc");
pdu->pdu_connection = conn;
return (pdu);
}
struct pdu *
pdu_new_response(struct pdu *request)
{
return (pdu_new(request->pdu_connection));
}
#ifdef ICL_KERNEL_PROXY
static void
pdu_receive_proxy(struct pdu *pdu)
{
struct connection *conn;
struct iscsi_daemon_receive *idr;
size_t len;
int error;
conn = pdu->pdu_connection;
assert(conn->conn_conf.isc_iser != 0);
pdu->pdu_data = malloc(conn->conn_max_recv_data_segment_length);
if (pdu->pdu_data == NULL)
log_err(1, "malloc");
idr = calloc(1, sizeof(*idr));
if (idr == NULL)
log_err(1, "calloc");
idr->idr_session_id = conn->conn_session_id;
idr->idr_bhs = pdu->pdu_bhs;
idr->idr_data_segment_len = conn->conn_max_recv_data_segment_length;
idr->idr_data_segment = pdu->pdu_data;
error = ioctl(conn->conn_iscsi_fd, ISCSIDRECEIVE, idr);
if (error != 0)
log_err(1, "ISCSIDRECEIVE");
len = pdu_ahs_length(pdu);
if (len > 0)
log_errx(1, "protocol error: non-empty AHS");
len = pdu_data_segment_length(pdu);
assert(len <= (size_t)conn->conn_max_recv_data_segment_length);
pdu->pdu_data_len = len;
free(idr);
}
static void
pdu_send_proxy(struct pdu *pdu)
{
struct connection *conn;
struct iscsi_daemon_send *ids;
int error;
conn = pdu->pdu_connection;
assert(conn->conn_conf.isc_iser != 0);
pdu_set_data_segment_length(pdu, pdu->pdu_data_len);
ids = calloc(1, sizeof(*ids));
if (ids == NULL)
log_err(1, "calloc");
ids->ids_session_id = conn->conn_session_id;
ids->ids_bhs = pdu->pdu_bhs;
ids->ids_data_segment_len = pdu->pdu_data_len;
ids->ids_data_segment = pdu->pdu_data;
error = ioctl(conn->conn_iscsi_fd, ISCSIDSEND, ids);
if (error != 0)
log_err(1, "ISCSIDSEND");
free(ids);
}
#endif /* ICL_KERNEL_PROXY */
static size_t
pdu_padding(const struct pdu *pdu)
{
if ((pdu->pdu_data_len % 4) != 0)
return (4 - (pdu->pdu_data_len % 4));
return (0);
}
static void
pdu_read(const struct connection *conn, char *data, size_t len)
{
ssize_t ret;
while (len > 0) {
ret = read(conn->conn_socket, data, len);
if (ret < 0) {
if (timed_out()) {
fail(conn, "Login Phase timeout");
log_errx(1, "exiting due to timeout");
}
fail(conn, strerror(errno));
log_err(1, "read");
} else if (ret == 0) {
fail(conn, "connection lost");
log_errx(1, "read: connection lost");
}
len -= ret;
data += ret;
}
}
void
pdu_receive(struct pdu *pdu)
{
struct connection *conn;
size_t len, padding;
char dummy[4];
conn = pdu->pdu_connection;
#ifdef ICL_KERNEL_PROXY
if (conn->conn_conf.isc_iser != 0)
return (pdu_receive_proxy(pdu));
#endif
assert(conn->conn_conf.isc_iser == 0);
pdu_read(conn, (char *)pdu->pdu_bhs, sizeof(*pdu->pdu_bhs));
len = pdu_ahs_length(pdu);
if (len > 0)
log_errx(1, "protocol error: non-empty AHS");
len = pdu_data_segment_length(pdu);
if (len > 0) {
if (len > (size_t)conn->conn_max_recv_data_segment_length) {
log_errx(1, "protocol error: received PDU "
"with DataSegmentLength exceeding %d",
conn->conn_max_recv_data_segment_length);
}
pdu->pdu_data_len = len;
pdu->pdu_data = malloc(len);
if (pdu->pdu_data == NULL)
log_err(1, "malloc");
pdu_read(conn, (char *)pdu->pdu_data, pdu->pdu_data_len);
padding = pdu_padding(pdu);
if (padding != 0) {
assert(padding < sizeof(dummy));
pdu_read(conn, (char *)dummy, padding);
}
}
}
void
pdu_send(struct pdu *pdu)
{
struct connection *conn;
ssize_t ret, total_len;
size_t padding;
uint32_t zero = 0;
struct iovec iov[3];
int iovcnt;
conn = pdu->pdu_connection;
#ifdef ICL_KERNEL_PROXY
if (conn->conn_conf.isc_iser != 0)
return (pdu_send_proxy(pdu));
#endif
assert(conn->conn_conf.isc_iser == 0);
pdu_set_data_segment_length(pdu, pdu->pdu_data_len);
iov[0].iov_base = pdu->pdu_bhs;
iov[0].iov_len = sizeof(*pdu->pdu_bhs);
total_len = iov[0].iov_len;
iovcnt = 1;
if (pdu->pdu_data_len > 0) {
iov[1].iov_base = pdu->pdu_data;
iov[1].iov_len = pdu->pdu_data_len;
total_len += iov[1].iov_len;
iovcnt = 2;
padding = pdu_padding(pdu);
if (padding > 0) {
assert(padding < sizeof(zero));
iov[2].iov_base = &zero;
iov[2].iov_len = padding;
total_len += iov[2].iov_len;
iovcnt = 3;
}
}
ret = writev(conn->conn_socket, iov, iovcnt);
if (ret < 0) {
if (timed_out())
log_errx(1, "exiting due to timeout");
log_err(1, "writev");
}
if (ret != total_len)
log_errx(1, "short write");
}
void
pdu_delete(struct pdu *pdu)
{
free(pdu->pdu_data);
free(pdu->pdu_bhs);
free(pdu);
}