437 lines
12 KiB
C
437 lines
12 KiB
C
/*******************************************************************************
|
|
* Filename: target_core_fabric_lib.c
|
|
*
|
|
* This file contains generic high level protocol identifier and PR
|
|
* handlers for TCM fabric modules
|
|
*
|
|
* (c) Copyright 2010-2013 Datera, Inc.
|
|
*
|
|
* Nicholas A. Bellinger <nab@linux-iscsi.org>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
*
|
|
******************************************************************************/
|
|
|
|
/*
|
|
* See SPC4, section 7.5 "Protocol specific parameters" for details
|
|
* on the formats implemented in this file.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/string.h>
|
|
#include <linux/ctype.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/export.h>
|
|
#include <asm/unaligned.h>
|
|
|
|
#include <scsi/scsi_proto.h>
|
|
|
|
#include <target/target_core_base.h>
|
|
#include <target/target_core_fabric.h>
|
|
|
|
#include "target_core_internal.h"
|
|
#include "target_core_pr.h"
|
|
|
|
|
|
static int sas_get_pr_transport_id(
|
|
struct se_node_acl *nacl,
|
|
int *format_code,
|
|
unsigned char *buf)
|
|
{
|
|
int ret;
|
|
|
|
/* Skip over 'naa. prefix */
|
|
ret = hex2bin(&buf[4], &nacl->initiatorname[4], 8);
|
|
if (ret) {
|
|
pr_debug("%s: invalid hex string\n", __func__);
|
|
return ret;
|
|
}
|
|
|
|
return 24;
|
|
}
|
|
|
|
static int fc_get_pr_transport_id(
|
|
struct se_node_acl *se_nacl,
|
|
int *format_code,
|
|
unsigned char *buf)
|
|
{
|
|
unsigned char *ptr;
|
|
int i, ret;
|
|
u32 off = 8;
|
|
|
|
/*
|
|
* We convert the ASCII formatted N Port name into a binary
|
|
* encoded TransportID.
|
|
*/
|
|
ptr = &se_nacl->initiatorname[0];
|
|
for (i = 0; i < 24; ) {
|
|
if (!strncmp(&ptr[i], ":", 1)) {
|
|
i++;
|
|
continue;
|
|
}
|
|
ret = hex2bin(&buf[off++], &ptr[i], 1);
|
|
if (ret < 0) {
|
|
pr_debug("%s: invalid hex string\n", __func__);
|
|
return ret;
|
|
}
|
|
i += 2;
|
|
}
|
|
/*
|
|
* The FC Transport ID is a hardcoded 24-byte length
|
|
*/
|
|
return 24;
|
|
}
|
|
|
|
static int sbp_get_pr_transport_id(
|
|
struct se_node_acl *nacl,
|
|
int *format_code,
|
|
unsigned char *buf)
|
|
{
|
|
int ret;
|
|
|
|
ret = hex2bin(&buf[8], nacl->initiatorname, 8);
|
|
if (ret) {
|
|
pr_debug("%s: invalid hex string\n", __func__);
|
|
return ret;
|
|
}
|
|
|
|
return 24;
|
|
}
|
|
|
|
static int srp_get_pr_transport_id(
|
|
struct se_node_acl *nacl,
|
|
int *format_code,
|
|
unsigned char *buf)
|
|
{
|
|
const char *p;
|
|
unsigned len, count, leading_zero_bytes;
|
|
int rc;
|
|
|
|
p = nacl->initiatorname;
|
|
if (strncasecmp(p, "0x", 2) == 0)
|
|
p += 2;
|
|
len = strlen(p);
|
|
if (len % 2)
|
|
return -EINVAL;
|
|
|
|
count = min(len / 2, 16U);
|
|
leading_zero_bytes = 16 - count;
|
|
memset(buf + 8, 0, leading_zero_bytes);
|
|
rc = hex2bin(buf + 8 + leading_zero_bytes, p, count);
|
|
if (rc < 0) {
|
|
pr_debug("hex2bin failed for %s: %d\n", __func__, rc);
|
|
return rc;
|
|
}
|
|
|
|
return 24;
|
|
}
|
|
|
|
static int iscsi_get_pr_transport_id(
|
|
struct se_node_acl *se_nacl,
|
|
struct t10_pr_registration *pr_reg,
|
|
int *format_code,
|
|
unsigned char *buf)
|
|
{
|
|
u32 off = 4, padding = 0;
|
|
u16 len = 0;
|
|
|
|
spin_lock_irq(&se_nacl->nacl_sess_lock);
|
|
/*
|
|
* From spc4r17 Section 7.5.4.6: TransportID for initiator
|
|
* ports using SCSI over iSCSI.
|
|
*
|
|
* The null-terminated, null-padded (see 4.4.2) ISCSI NAME field
|
|
* shall contain the iSCSI name of an iSCSI initiator node (see
|
|
* RFC 3720). The first ISCSI NAME field byte containing an ASCII
|
|
* null character terminates the ISCSI NAME field without regard for
|
|
* the specified length of the iSCSI TransportID or the contents of
|
|
* the ADDITIONAL LENGTH field.
|
|
*/
|
|
len = sprintf(&buf[off], "%s", se_nacl->initiatorname);
|
|
/*
|
|
* Add Extra byte for NULL terminator
|
|
*/
|
|
len++;
|
|
/*
|
|
* If there is ISID present with the registration and *format code == 1
|
|
* 1, use iSCSI Initiator port TransportID format.
|
|
*
|
|
* Otherwise use iSCSI Initiator device TransportID format that
|
|
* does not contain the ASCII encoded iSCSI Initiator iSID value
|
|
* provied by the iSCSi Initiator during the iSCSI login process.
|
|
*/
|
|
if ((*format_code == 1) && (pr_reg->isid_present_at_reg)) {
|
|
/*
|
|
* Set FORMAT CODE 01b for iSCSI Initiator port TransportID
|
|
* format.
|
|
*/
|
|
buf[0] |= 0x40;
|
|
/*
|
|
* From spc4r17 Section 7.5.4.6: TransportID for initiator
|
|
* ports using SCSI over iSCSI. Table 390
|
|
*
|
|
* The SEPARATOR field shall contain the five ASCII
|
|
* characters ",i,0x".
|
|
*
|
|
* The null-terminated, null-padded ISCSI INITIATOR SESSION ID
|
|
* field shall contain the iSCSI initiator session identifier
|
|
* (see RFC 3720) in the form of ASCII characters that are the
|
|
* hexadecimal digits converted from the binary iSCSI initiator
|
|
* session identifier value. The first ISCSI INITIATOR SESSION
|
|
* ID field byte containing an ASCII null character
|
|
*/
|
|
buf[off+len] = 0x2c; off++; /* ASCII Character: "," */
|
|
buf[off+len] = 0x69; off++; /* ASCII Character: "i" */
|
|
buf[off+len] = 0x2c; off++; /* ASCII Character: "," */
|
|
buf[off+len] = 0x30; off++; /* ASCII Character: "0" */
|
|
buf[off+len] = 0x78; off++; /* ASCII Character: "x" */
|
|
len += 5;
|
|
buf[off+len] = pr_reg->pr_reg_isid[0]; off++;
|
|
buf[off+len] = pr_reg->pr_reg_isid[1]; off++;
|
|
buf[off+len] = pr_reg->pr_reg_isid[2]; off++;
|
|
buf[off+len] = pr_reg->pr_reg_isid[3]; off++;
|
|
buf[off+len] = pr_reg->pr_reg_isid[4]; off++;
|
|
buf[off+len] = pr_reg->pr_reg_isid[5]; off++;
|
|
buf[off+len] = '\0'; off++;
|
|
len += 7;
|
|
}
|
|
spin_unlock_irq(&se_nacl->nacl_sess_lock);
|
|
/*
|
|
* The ADDITIONAL LENGTH field specifies the number of bytes that follow
|
|
* in the TransportID. The additional length shall be at least 20 and
|
|
* shall be a multiple of four.
|
|
*/
|
|
padding = ((-len) & 3);
|
|
if (padding != 0)
|
|
len += padding;
|
|
|
|
put_unaligned_be16(len, &buf[2]);
|
|
/*
|
|
* Increment value for total payload + header length for
|
|
* full status descriptor
|
|
*/
|
|
len += 4;
|
|
|
|
return len;
|
|
}
|
|
|
|
static int iscsi_get_pr_transport_id_len(
|
|
struct se_node_acl *se_nacl,
|
|
struct t10_pr_registration *pr_reg,
|
|
int *format_code)
|
|
{
|
|
u32 len = 0, padding = 0;
|
|
|
|
spin_lock_irq(&se_nacl->nacl_sess_lock);
|
|
len = strlen(se_nacl->initiatorname);
|
|
/*
|
|
* Add extra byte for NULL terminator
|
|
*/
|
|
len++;
|
|
/*
|
|
* If there is ISID present with the registration, use format code:
|
|
* 01b: iSCSI Initiator port TransportID format
|
|
*
|
|
* If there is not an active iSCSI session, use format code:
|
|
* 00b: iSCSI Initiator device TransportID format
|
|
*/
|
|
if (pr_reg->isid_present_at_reg) {
|
|
len += 5; /* For ",i,0x" ASCII separator */
|
|
len += 7; /* For iSCSI Initiator Session ID + Null terminator */
|
|
*format_code = 1;
|
|
} else
|
|
*format_code = 0;
|
|
spin_unlock_irq(&se_nacl->nacl_sess_lock);
|
|
/*
|
|
* The ADDITIONAL LENGTH field specifies the number of bytes that follow
|
|
* in the TransportID. The additional length shall be at least 20 and
|
|
* shall be a multiple of four.
|
|
*/
|
|
padding = ((-len) & 3);
|
|
if (padding != 0)
|
|
len += padding;
|
|
/*
|
|
* Increment value for total payload + header length for
|
|
* full status descriptor
|
|
*/
|
|
len += 4;
|
|
|
|
return len;
|
|
}
|
|
|
|
static char *iscsi_parse_pr_out_transport_id(
|
|
struct se_portal_group *se_tpg,
|
|
const char *buf,
|
|
u32 *out_tid_len,
|
|
char **port_nexus_ptr)
|
|
{
|
|
char *p;
|
|
u32 tid_len, padding;
|
|
int i;
|
|
u16 add_len;
|
|
u8 format_code = (buf[0] & 0xc0);
|
|
/*
|
|
* Check for FORMAT CODE 00b or 01b from spc4r17, section 7.5.4.6:
|
|
*
|
|
* TransportID for initiator ports using SCSI over iSCSI,
|
|
* from Table 388 -- iSCSI TransportID formats.
|
|
*
|
|
* 00b Initiator port is identified using the world wide unique
|
|
* SCSI device name of the iSCSI initiator
|
|
* device containing the initiator port (see table 389).
|
|
* 01b Initiator port is identified using the world wide unique
|
|
* initiator port identifier (see table 390).10b to 11b
|
|
* Reserved
|
|
*/
|
|
if ((format_code != 0x00) && (format_code != 0x40)) {
|
|
pr_err("Illegal format code: 0x%02x for iSCSI"
|
|
" Initiator Transport ID\n", format_code);
|
|
return NULL;
|
|
}
|
|
/*
|
|
* If the caller wants the TransportID Length, we set that value for the
|
|
* entire iSCSI Tarnsport ID now.
|
|
*/
|
|
if (out_tid_len) {
|
|
/* The shift works thanks to integer promotion rules */
|
|
add_len = get_unaligned_be16(&buf[2]);
|
|
|
|
tid_len = strlen(&buf[4]);
|
|
tid_len += 4; /* Add four bytes for iSCSI Transport ID header */
|
|
tid_len += 1; /* Add one byte for NULL terminator */
|
|
padding = ((-tid_len) & 3);
|
|
if (padding != 0)
|
|
tid_len += padding;
|
|
|
|
if ((add_len + 4) != tid_len) {
|
|
pr_debug("LIO-Target Extracted add_len: %hu "
|
|
"does not match calculated tid_len: %u,"
|
|
" using tid_len instead\n", add_len+4, tid_len);
|
|
*out_tid_len = tid_len;
|
|
} else
|
|
*out_tid_len = (add_len + 4);
|
|
}
|
|
/*
|
|
* Check for ',i,0x' separator between iSCSI Name and iSCSI Initiator
|
|
* Session ID as defined in Table 390 - iSCSI initiator port TransportID
|
|
* format.
|
|
*/
|
|
if (format_code == 0x40) {
|
|
p = strstr(&buf[4], ",i,0x");
|
|
if (!p) {
|
|
pr_err("Unable to locate \",i,0x\" separator"
|
|
" for Initiator port identifier: %s\n",
|
|
&buf[4]);
|
|
return NULL;
|
|
}
|
|
*p = '\0'; /* Terminate iSCSI Name */
|
|
p += 5; /* Skip over ",i,0x" separator */
|
|
|
|
*port_nexus_ptr = p;
|
|
/*
|
|
* Go ahead and do the lower case conversion of the received
|
|
* 12 ASCII characters representing the ISID in the TransportID
|
|
* for comparison against the running iSCSI session's ISID from
|
|
* iscsi_target.c:lio_sess_get_initiator_sid()
|
|
*/
|
|
for (i = 0; i < 12; i++) {
|
|
if (isdigit(*p)) {
|
|
p++;
|
|
continue;
|
|
}
|
|
*p = tolower(*p);
|
|
p++;
|
|
}
|
|
}
|
|
|
|
return (char *)&buf[4];
|
|
}
|
|
|
|
int target_get_pr_transport_id_len(struct se_node_acl *nacl,
|
|
struct t10_pr_registration *pr_reg, int *format_code)
|
|
{
|
|
switch (nacl->se_tpg->proto_id) {
|
|
case SCSI_PROTOCOL_FCP:
|
|
case SCSI_PROTOCOL_SBP:
|
|
case SCSI_PROTOCOL_SRP:
|
|
case SCSI_PROTOCOL_SAS:
|
|
break;
|
|
case SCSI_PROTOCOL_ISCSI:
|
|
return iscsi_get_pr_transport_id_len(nacl, pr_reg, format_code);
|
|
default:
|
|
pr_err("Unknown proto_id: 0x%02x\n", nacl->se_tpg->proto_id);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Most transports use a fixed length 24 byte identifier.
|
|
*/
|
|
*format_code = 0;
|
|
return 24;
|
|
}
|
|
|
|
int target_get_pr_transport_id(struct se_node_acl *nacl,
|
|
struct t10_pr_registration *pr_reg, int *format_code,
|
|
unsigned char *buf)
|
|
{
|
|
switch (nacl->se_tpg->proto_id) {
|
|
case SCSI_PROTOCOL_SAS:
|
|
return sas_get_pr_transport_id(nacl, format_code, buf);
|
|
case SCSI_PROTOCOL_SBP:
|
|
return sbp_get_pr_transport_id(nacl, format_code, buf);
|
|
case SCSI_PROTOCOL_SRP:
|
|
return srp_get_pr_transport_id(nacl, format_code, buf);
|
|
case SCSI_PROTOCOL_FCP:
|
|
return fc_get_pr_transport_id(nacl, format_code, buf);
|
|
case SCSI_PROTOCOL_ISCSI:
|
|
return iscsi_get_pr_transport_id(nacl, pr_reg, format_code,
|
|
buf);
|
|
default:
|
|
pr_err("Unknown proto_id: 0x%02x\n", nacl->se_tpg->proto_id);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
const char *target_parse_pr_out_transport_id(struct se_portal_group *tpg,
|
|
const char *buf, u32 *out_tid_len, char **port_nexus_ptr)
|
|
{
|
|
u32 offset;
|
|
|
|
switch (tpg->proto_id) {
|
|
case SCSI_PROTOCOL_SAS:
|
|
/*
|
|
* Assume the FORMAT CODE 00b from spc4r17, 7.5.4.7 TransportID
|
|
* for initiator ports using SCSI over SAS Serial SCSI Protocol.
|
|
*/
|
|
offset = 4;
|
|
break;
|
|
case SCSI_PROTOCOL_SBP:
|
|
case SCSI_PROTOCOL_SRP:
|
|
case SCSI_PROTOCOL_FCP:
|
|
offset = 8;
|
|
break;
|
|
case SCSI_PROTOCOL_ISCSI:
|
|
return iscsi_parse_pr_out_transport_id(tpg, buf, out_tid_len,
|
|
port_nexus_ptr);
|
|
default:
|
|
pr_err("Unknown proto_id: 0x%02x\n", tpg->proto_id);
|
|
return NULL;
|
|
}
|
|
|
|
*port_nexus_ptr = NULL;
|
|
*out_tid_len = 24;
|
|
return buf + offset;
|
|
}
|