424 строки
11 KiB
C
424 строки
11 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*******************************************************************************
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* Filename: target_core_fabric_lib.c
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*
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* This file contains generic high level protocol identifier and PR
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* handlers for TCM fabric modules
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*
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* (c) Copyright 2010-2013 Datera, Inc.
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*
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* Nicholas A. Bellinger <nab@linux-iscsi.org>
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*
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******************************************************************************/
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/*
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* See SPC4, section 7.5 "Protocol specific parameters" for details
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* on the formats implemented in this file.
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*/
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/ctype.h>
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#include <linux/spinlock.h>
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#include <linux/export.h>
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#include <asm/unaligned.h>
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#include <scsi/scsi_proto.h>
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#include <target/target_core_base.h>
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#include <target/target_core_fabric.h>
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#include "target_core_internal.h"
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#include "target_core_pr.h"
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static int sas_get_pr_transport_id(
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struct se_node_acl *nacl,
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int *format_code,
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unsigned char *buf)
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{
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int ret;
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/* Skip over 'naa. prefix */
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ret = hex2bin(&buf[4], &nacl->initiatorname[4], 8);
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if (ret) {
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pr_debug("%s: invalid hex string\n", __func__);
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return ret;
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}
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return 24;
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}
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static int fc_get_pr_transport_id(
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struct se_node_acl *se_nacl,
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int *format_code,
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unsigned char *buf)
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{
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unsigned char *ptr;
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int i, ret;
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u32 off = 8;
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/*
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* We convert the ASCII formatted N Port name into a binary
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* encoded TransportID.
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*/
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ptr = &se_nacl->initiatorname[0];
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for (i = 0; i < 24; ) {
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if (!strncmp(&ptr[i], ":", 1)) {
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i++;
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continue;
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}
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ret = hex2bin(&buf[off++], &ptr[i], 1);
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if (ret < 0) {
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pr_debug("%s: invalid hex string\n", __func__);
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return ret;
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}
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i += 2;
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}
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/*
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* The FC Transport ID is a hardcoded 24-byte length
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*/
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return 24;
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}
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static int sbp_get_pr_transport_id(
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struct se_node_acl *nacl,
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int *format_code,
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unsigned char *buf)
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{
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int ret;
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ret = hex2bin(&buf[8], nacl->initiatorname, 8);
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if (ret) {
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pr_debug("%s: invalid hex string\n", __func__);
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return ret;
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}
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return 24;
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}
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static int srp_get_pr_transport_id(
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struct se_node_acl *nacl,
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int *format_code,
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unsigned char *buf)
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{
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const char *p;
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unsigned len, count, leading_zero_bytes;
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int rc;
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p = nacl->initiatorname;
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if (strncasecmp(p, "0x", 2) == 0)
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p += 2;
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len = strlen(p);
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if (len % 2)
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return -EINVAL;
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count = min(len / 2, 16U);
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leading_zero_bytes = 16 - count;
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memset(buf + 8, 0, leading_zero_bytes);
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rc = hex2bin(buf + 8 + leading_zero_bytes, p, count);
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if (rc < 0) {
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pr_debug("hex2bin failed for %s: %d\n", p, rc);
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return rc;
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}
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return 24;
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}
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static int iscsi_get_pr_transport_id(
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struct se_node_acl *se_nacl,
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struct t10_pr_registration *pr_reg,
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int *format_code,
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unsigned char *buf)
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{
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u32 off = 4, padding = 0;
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u16 len = 0;
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spin_lock_irq(&se_nacl->nacl_sess_lock);
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/*
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* From spc4r17 Section 7.5.4.6: TransportID for initiator
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* ports using SCSI over iSCSI.
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*
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* The null-terminated, null-padded (see 4.4.2) ISCSI NAME field
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* shall contain the iSCSI name of an iSCSI initiator node (see
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* RFC 3720). The first ISCSI NAME field byte containing an ASCII
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* null character terminates the ISCSI NAME field without regard for
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* the specified length of the iSCSI TransportID or the contents of
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* the ADDITIONAL LENGTH field.
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*/
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len = sprintf(&buf[off], "%s", se_nacl->initiatorname);
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/*
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* Add Extra byte for NULL terminator
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*/
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len++;
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/*
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* If there is ISID present with the registration and *format code == 1
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* 1, use iSCSI Initiator port TransportID format.
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*
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* Otherwise use iSCSI Initiator device TransportID format that
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* does not contain the ASCII encoded iSCSI Initiator iSID value
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* provied by the iSCSi Initiator during the iSCSI login process.
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*/
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if ((*format_code == 1) && (pr_reg->isid_present_at_reg)) {
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/*
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* Set FORMAT CODE 01b for iSCSI Initiator port TransportID
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* format.
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*/
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buf[0] |= 0x40;
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/*
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* From spc4r17 Section 7.5.4.6: TransportID for initiator
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* ports using SCSI over iSCSI. Table 390
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*
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* The SEPARATOR field shall contain the five ASCII
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* characters ",i,0x".
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*
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* The null-terminated, null-padded ISCSI INITIATOR SESSION ID
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* field shall contain the iSCSI initiator session identifier
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* (see RFC 3720) in the form of ASCII characters that are the
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* hexadecimal digits converted from the binary iSCSI initiator
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* session identifier value. The first ISCSI INITIATOR SESSION
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* ID field byte containing an ASCII null character
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*/
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buf[off+len] = 0x2c; off++; /* ASCII Character: "," */
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buf[off+len] = 0x69; off++; /* ASCII Character: "i" */
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buf[off+len] = 0x2c; off++; /* ASCII Character: "," */
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buf[off+len] = 0x30; off++; /* ASCII Character: "0" */
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buf[off+len] = 0x78; off++; /* ASCII Character: "x" */
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len += 5;
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buf[off+len] = pr_reg->pr_reg_isid[0]; off++;
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buf[off+len] = pr_reg->pr_reg_isid[1]; off++;
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buf[off+len] = pr_reg->pr_reg_isid[2]; off++;
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buf[off+len] = pr_reg->pr_reg_isid[3]; off++;
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buf[off+len] = pr_reg->pr_reg_isid[4]; off++;
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buf[off+len] = pr_reg->pr_reg_isid[5]; off++;
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buf[off+len] = '\0'; off++;
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len += 7;
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}
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spin_unlock_irq(&se_nacl->nacl_sess_lock);
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/*
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* The ADDITIONAL LENGTH field specifies the number of bytes that follow
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* in the TransportID. The additional length shall be at least 20 and
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* shall be a multiple of four.
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*/
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padding = ((-len) & 3);
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if (padding != 0)
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len += padding;
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put_unaligned_be16(len, &buf[2]);
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/*
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* Increment value for total payload + header length for
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* full status descriptor
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*/
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len += 4;
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return len;
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}
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static int iscsi_get_pr_transport_id_len(
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struct se_node_acl *se_nacl,
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struct t10_pr_registration *pr_reg,
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int *format_code)
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{
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u32 len = 0, padding = 0;
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spin_lock_irq(&se_nacl->nacl_sess_lock);
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len = strlen(se_nacl->initiatorname);
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/*
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* Add extra byte for NULL terminator
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*/
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len++;
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/*
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* If there is ISID present with the registration, use format code:
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* 01b: iSCSI Initiator port TransportID format
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*
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* If there is not an active iSCSI session, use format code:
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* 00b: iSCSI Initiator device TransportID format
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*/
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if (pr_reg->isid_present_at_reg) {
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len += 5; /* For ",i,0x" ASCII separator */
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len += 7; /* For iSCSI Initiator Session ID + Null terminator */
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*format_code = 1;
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} else
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*format_code = 0;
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spin_unlock_irq(&se_nacl->nacl_sess_lock);
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/*
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* The ADDITIONAL LENGTH field specifies the number of bytes that follow
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* in the TransportID. The additional length shall be at least 20 and
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* shall be a multiple of four.
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*/
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padding = ((-len) & 3);
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if (padding != 0)
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len += padding;
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/*
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* Increment value for total payload + header length for
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* full status descriptor
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*/
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len += 4;
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return len;
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}
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static char *iscsi_parse_pr_out_transport_id(
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struct se_portal_group *se_tpg,
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char *buf,
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u32 *out_tid_len,
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char **port_nexus_ptr)
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{
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char *p;
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u32 tid_len, padding;
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int i;
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u16 add_len;
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u8 format_code = (buf[0] & 0xc0);
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/*
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* Check for FORMAT CODE 00b or 01b from spc4r17, section 7.5.4.6:
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*
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* TransportID for initiator ports using SCSI over iSCSI,
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* from Table 388 -- iSCSI TransportID formats.
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*
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* 00b Initiator port is identified using the world wide unique
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* SCSI device name of the iSCSI initiator
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* device containing the initiator port (see table 389).
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* 01b Initiator port is identified using the world wide unique
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* initiator port identifier (see table 390).10b to 11b
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* Reserved
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*/
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if ((format_code != 0x00) && (format_code != 0x40)) {
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pr_err("Illegal format code: 0x%02x for iSCSI"
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" Initiator Transport ID\n", format_code);
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return NULL;
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}
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/*
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* If the caller wants the TransportID Length, we set that value for the
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* entire iSCSI Tarnsport ID now.
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*/
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if (out_tid_len) {
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/* The shift works thanks to integer promotion rules */
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add_len = get_unaligned_be16(&buf[2]);
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tid_len = strlen(&buf[4]);
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tid_len += 4; /* Add four bytes for iSCSI Transport ID header */
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tid_len += 1; /* Add one byte for NULL terminator */
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padding = ((-tid_len) & 3);
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if (padding != 0)
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tid_len += padding;
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if ((add_len + 4) != tid_len) {
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pr_debug("LIO-Target Extracted add_len: %hu "
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"does not match calculated tid_len: %u,"
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" using tid_len instead\n", add_len+4, tid_len);
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*out_tid_len = tid_len;
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} else
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*out_tid_len = (add_len + 4);
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}
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/*
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* Check for ',i,0x' separator between iSCSI Name and iSCSI Initiator
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* Session ID as defined in Table 390 - iSCSI initiator port TransportID
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* format.
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*/
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if (format_code == 0x40) {
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p = strstr(&buf[4], ",i,0x");
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if (!p) {
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pr_err("Unable to locate \",i,0x\" separator"
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" for Initiator port identifier: %s\n",
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&buf[4]);
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return NULL;
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}
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*p = '\0'; /* Terminate iSCSI Name */
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p += 5; /* Skip over ",i,0x" separator */
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*port_nexus_ptr = p;
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/*
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* Go ahead and do the lower case conversion of the received
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* 12 ASCII characters representing the ISID in the TransportID
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* for comparison against the running iSCSI session's ISID from
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* iscsi_target.c:lio_sess_get_initiator_sid()
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*/
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for (i = 0; i < 12; i++) {
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if (isdigit(*p)) {
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p++;
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continue;
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}
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*p = tolower(*p);
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p++;
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}
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}
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return &buf[4];
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}
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int target_get_pr_transport_id_len(struct se_node_acl *nacl,
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struct t10_pr_registration *pr_reg, int *format_code)
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{
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switch (nacl->se_tpg->proto_id) {
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case SCSI_PROTOCOL_FCP:
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case SCSI_PROTOCOL_SBP:
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case SCSI_PROTOCOL_SRP:
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case SCSI_PROTOCOL_SAS:
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break;
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case SCSI_PROTOCOL_ISCSI:
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return iscsi_get_pr_transport_id_len(nacl, pr_reg, format_code);
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default:
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pr_err("Unknown proto_id: 0x%02x\n", nacl->se_tpg->proto_id);
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return -EINVAL;
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}
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/*
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* Most transports use a fixed length 24 byte identifier.
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*/
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*format_code = 0;
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return 24;
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}
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int target_get_pr_transport_id(struct se_node_acl *nacl,
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struct t10_pr_registration *pr_reg, int *format_code,
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unsigned char *buf)
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{
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switch (nacl->se_tpg->proto_id) {
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case SCSI_PROTOCOL_SAS:
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return sas_get_pr_transport_id(nacl, format_code, buf);
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case SCSI_PROTOCOL_SBP:
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return sbp_get_pr_transport_id(nacl, format_code, buf);
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case SCSI_PROTOCOL_SRP:
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return srp_get_pr_transport_id(nacl, format_code, buf);
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case SCSI_PROTOCOL_FCP:
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return fc_get_pr_transport_id(nacl, format_code, buf);
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case SCSI_PROTOCOL_ISCSI:
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return iscsi_get_pr_transport_id(nacl, pr_reg, format_code,
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buf);
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default:
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pr_err("Unknown proto_id: 0x%02x\n", nacl->se_tpg->proto_id);
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return -EINVAL;
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}
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}
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const char *target_parse_pr_out_transport_id(struct se_portal_group *tpg,
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char *buf, u32 *out_tid_len, char **port_nexus_ptr)
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{
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u32 offset;
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switch (tpg->proto_id) {
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case SCSI_PROTOCOL_SAS:
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/*
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* Assume the FORMAT CODE 00b from spc4r17, 7.5.4.7 TransportID
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* for initiator ports using SCSI over SAS Serial SCSI Protocol.
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*/
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offset = 4;
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break;
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case SCSI_PROTOCOL_SBP:
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case SCSI_PROTOCOL_SRP:
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case SCSI_PROTOCOL_FCP:
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offset = 8;
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break;
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case SCSI_PROTOCOL_ISCSI:
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return iscsi_parse_pr_out_transport_id(tpg, buf, out_tid_len,
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port_nexus_ptr);
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default:
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pr_err("Unknown proto_id: 0x%02x\n", tpg->proto_id);
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return NULL;
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}
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*port_nexus_ptr = NULL;
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*out_tid_len = 24;
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return buf + offset;
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}
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