1 /*******************************************************************************
2 * Filename: target_core_fabric_lib.c
4 * This file contains generic high level protocol identifier and PR
5 * handlers for TCM fabric modules
7 * (c) Copyright 2010-2013 Datera, Inc.
9 * Nicholas A. Bellinger <nab@linux-iscsi.org>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
25 ******************************************************************************/
27 #include <linux/kernel.h>
28 #include <linux/string.h>
29 #include <linux/ctype.h>
30 #include <linux/spinlock.h>
31 #include <linux/export.h>
33 #include <target/target_core_base.h>
34 #include <target/target_core_fabric.h>
35 #include <target/target_core_configfs.h>
37 #include "target_core_internal.h"
38 #include "target_core_pr.h"
41 * Handlers for Serial Attached SCSI (SAS)
43 u8 sas_get_fabric_proto_ident(struct se_portal_group *se_tpg)
46 * Return a SAS Serial SCSI Protocol identifier for loopback operations
47 * This is defined in section 7.5.1 Table 362 in spc4r17
51 EXPORT_SYMBOL(sas_get_fabric_proto_ident);
53 u32 sas_get_pr_transport_id(
54 struct se_portal_group *se_tpg,
55 struct se_node_acl *se_nacl,
56 struct t10_pr_registration *pr_reg,
64 * Set PROTOCOL IDENTIFIER to 6h for SAS
68 * From spc4r17, 7.5.4.7 TransportID for initiator ports using SCSI
69 * over SAS Serial SCSI Protocol
71 ptr = &se_nacl->initiatorname[4]; /* Skip over 'naa. prefix */
73 ret = hex2bin(&buf[4], ptr, 8);
75 pr_debug("sas transport_id: invalid hex string\n");
78 * The SAS Transport ID is a hardcoded 24-byte length
82 EXPORT_SYMBOL(sas_get_pr_transport_id);
84 u32 sas_get_pr_transport_id_len(
85 struct se_portal_group *se_tpg,
86 struct se_node_acl *se_nacl,
87 struct t10_pr_registration *pr_reg,
92 * From spc4r17, 7.5.4.7 TransportID for initiator ports using SCSI
93 * over SAS Serial SCSI Protocol
95 * The SAS Transport ID is a hardcoded 24-byte length
99 EXPORT_SYMBOL(sas_get_pr_transport_id_len);
102 * Used for handling SCSI fabric dependent TransportIDs in SPC-3 and above
103 * Persistent Reservation SPEC_I_PT=1 and PROUT REGISTER_AND_MOVE operations.
105 char *sas_parse_pr_out_transport_id(
106 struct se_portal_group *se_tpg,
109 char **port_nexus_ptr)
112 * Assume the FORMAT CODE 00b from spc4r17, 7.5.4.7 TransportID
113 * for initiator ports using SCSI over SAS Serial SCSI Protocol
115 * The TransportID for a SAS Initiator Port is of fixed size of
116 * 24 bytes, and SAS does not contain a I_T nexus identifier,
117 * so we return the **port_nexus_ptr set to NULL.
119 *port_nexus_ptr = NULL;
122 return (char *)&buf[4];
124 EXPORT_SYMBOL(sas_parse_pr_out_transport_id);
127 * Handlers for Fibre Channel Protocol (FCP)
129 u8 fc_get_fabric_proto_ident(struct se_portal_group *se_tpg)
131 return 0x0; /* 0 = fcp-2 per SPC4 section 7.5.1 */
133 EXPORT_SYMBOL(fc_get_fabric_proto_ident);
135 u32 fc_get_pr_transport_id_len(
136 struct se_portal_group *se_tpg,
137 struct se_node_acl *se_nacl,
138 struct t10_pr_registration *pr_reg,
143 * The FC Transport ID is a hardcoded 24-byte length
147 EXPORT_SYMBOL(fc_get_pr_transport_id_len);
149 u32 fc_get_pr_transport_id(
150 struct se_portal_group *se_tpg,
151 struct se_node_acl *se_nacl,
152 struct t10_pr_registration *pr_reg,
161 * PROTOCOL IDENTIFIER is 0h for FCP-2
163 * From spc4r17, 7.5.4.2 TransportID for initiator ports using
164 * SCSI over Fibre Channel
166 * We convert the ASCII formatted N Port name into a binary
167 * encoded TransportID.
169 ptr = &se_nacl->initiatorname[0];
171 for (i = 0; i < 24; ) {
172 if (!strncmp(&ptr[i], ":", 1)) {
176 ret = hex2bin(&buf[off++], &ptr[i], 1);
178 pr_debug("fc transport_id: invalid hex string\n");
182 * The FC Transport ID is a hardcoded 24-byte length
186 EXPORT_SYMBOL(fc_get_pr_transport_id);
188 char *fc_parse_pr_out_transport_id(
189 struct se_portal_group *se_tpg,
192 char **port_nexus_ptr)
195 * The TransportID for a FC N Port is of fixed size of
196 * 24 bytes, and FC does not contain a I_T nexus identifier,
197 * so we return the **port_nexus_ptr set to NULL.
199 *port_nexus_ptr = NULL;
202 return (char *)&buf[8];
204 EXPORT_SYMBOL(fc_parse_pr_out_transport_id);
207 * Handlers for Internet Small Computer Systems Interface (iSCSI)
210 u8 iscsi_get_fabric_proto_ident(struct se_portal_group *se_tpg)
213 * This value is defined for "Internet SCSI (iSCSI)"
214 * in spc4r17 section 7.5.1 Table 362
218 EXPORT_SYMBOL(iscsi_get_fabric_proto_ident);
220 u32 iscsi_get_pr_transport_id(
221 struct se_portal_group *se_tpg,
222 struct se_node_acl *se_nacl,
223 struct t10_pr_registration *pr_reg,
227 u32 off = 4, padding = 0;
230 spin_lock_irq(&se_nacl->nacl_sess_lock);
232 * Set PROTOCOL IDENTIFIER to 5h for iSCSI
236 * From spc4r17 Section 7.5.4.6: TransportID for initiator
237 * ports using SCSI over iSCSI.
239 * The null-terminated, null-padded (see 4.4.2) ISCSI NAME field
240 * shall contain the iSCSI name of an iSCSI initiator node (see
241 * RFC 3720). The first ISCSI NAME field byte containing an ASCII
242 * null character terminates the ISCSI NAME field without regard for
243 * the specified length of the iSCSI TransportID or the contents of
244 * the ADDITIONAL LENGTH field.
246 len = sprintf(&buf[off], "%s", se_nacl->initiatorname);
248 * Add Extra byte for NULL terminator
252 * If there is ISID present with the registration and *format code == 1
253 * 1, use iSCSI Initiator port TransportID format.
255 * Otherwise use iSCSI Initiator device TransportID format that
256 * does not contain the ASCII encoded iSCSI Initiator iSID value
257 * provied by the iSCSi Initiator during the iSCSI login process.
259 if ((*format_code == 1) && (pr_reg->isid_present_at_reg)) {
261 * Set FORMAT CODE 01b for iSCSI Initiator port TransportID
266 * From spc4r17 Section 7.5.4.6: TransportID for initiator
267 * ports using SCSI over iSCSI. Table 390
269 * The SEPARATOR field shall contain the five ASCII
270 * characters ",i,0x".
272 * The null-terminated, null-padded ISCSI INITIATOR SESSION ID
273 * field shall contain the iSCSI initiator session identifier
274 * (see RFC 3720) in the form of ASCII characters that are the
275 * hexadecimal digits converted from the binary iSCSI initiator
276 * session identifier value. The first ISCSI INITIATOR SESSION
277 * ID field byte containing an ASCII null character
279 buf[off+len] = 0x2c; off++; /* ASCII Character: "," */
280 buf[off+len] = 0x69; off++; /* ASCII Character: "i" */
281 buf[off+len] = 0x2c; off++; /* ASCII Character: "," */
282 buf[off+len] = 0x30; off++; /* ASCII Character: "0" */
283 buf[off+len] = 0x78; off++; /* ASCII Character: "x" */
285 buf[off+len] = pr_reg->pr_reg_isid[0]; off++;
286 buf[off+len] = pr_reg->pr_reg_isid[1]; off++;
287 buf[off+len] = pr_reg->pr_reg_isid[2]; off++;
288 buf[off+len] = pr_reg->pr_reg_isid[3]; off++;
289 buf[off+len] = pr_reg->pr_reg_isid[4]; off++;
290 buf[off+len] = pr_reg->pr_reg_isid[5]; off++;
291 buf[off+len] = '\0'; off++;
294 spin_unlock_irq(&se_nacl->nacl_sess_lock);
296 * The ADDITIONAL LENGTH field specifies the number of bytes that follow
297 * in the TransportID. The additional length shall be at least 20 and
298 * shall be a multiple of four.
300 padding = ((-len) & 3);
304 buf[2] = ((len >> 8) & 0xff);
305 buf[3] = (len & 0xff);
307 * Increment value for total payload + header length for
308 * full status descriptor
314 EXPORT_SYMBOL(iscsi_get_pr_transport_id);
316 u32 iscsi_get_pr_transport_id_len(
317 struct se_portal_group *se_tpg,
318 struct se_node_acl *se_nacl,
319 struct t10_pr_registration *pr_reg,
322 u32 len = 0, padding = 0;
324 spin_lock_irq(&se_nacl->nacl_sess_lock);
325 len = strlen(se_nacl->initiatorname);
327 * Add extra byte for NULL terminator
331 * If there is ISID present with the registration, use format code:
332 * 01b: iSCSI Initiator port TransportID format
334 * If there is not an active iSCSI session, use format code:
335 * 00b: iSCSI Initiator device TransportID format
337 if (pr_reg->isid_present_at_reg) {
338 len += 5; /* For ",i,0x" ASCII separator */
339 len += 7; /* For iSCSI Initiator Session ID + Null terminator */
343 spin_unlock_irq(&se_nacl->nacl_sess_lock);
345 * The ADDITIONAL LENGTH field specifies the number of bytes that follow
346 * in the TransportID. The additional length shall be at least 20 and
347 * shall be a multiple of four.
349 padding = ((-len) & 3);
353 * Increment value for total payload + header length for
354 * full status descriptor
360 EXPORT_SYMBOL(iscsi_get_pr_transport_id_len);
362 char *iscsi_parse_pr_out_transport_id(
363 struct se_portal_group *se_tpg,
366 char **port_nexus_ptr)
369 u32 tid_len, padding;
372 u8 format_code = (buf[0] & 0xc0);
374 * Check for FORMAT CODE 00b or 01b from spc4r17, section 7.5.4.6:
376 * TransportID for initiator ports using SCSI over iSCSI,
377 * from Table 388 -- iSCSI TransportID formats.
379 * 00b Initiator port is identified using the world wide unique
380 * SCSI device name of the iSCSI initiator
381 * device containing the initiator port (see table 389).
382 * 01b Initiator port is identified using the world wide unique
383 * initiator port identifier (see table 390).10b to 11b
386 if ((format_code != 0x00) && (format_code != 0x40)) {
387 pr_err("Illegal format code: 0x%02x for iSCSI"
388 " Initiator Transport ID\n", format_code);
392 * If the caller wants the TransportID Length, we set that value for the
393 * entire iSCSI Tarnsport ID now.
396 /* The shift works thanks to integer promotion rules */
397 add_len = (buf[2] << 8) | buf[3];
399 tid_len = strlen(&buf[4]);
400 tid_len += 4; /* Add four bytes for iSCSI Transport ID header */
401 tid_len += 1; /* Add one byte for NULL terminator */
402 padding = ((-tid_len) & 3);
406 if ((add_len + 4) != tid_len) {
407 pr_debug("LIO-Target Extracted add_len: %hu "
408 "does not match calculated tid_len: %u,"
409 " using tid_len instead\n", add_len+4, tid_len);
410 *out_tid_len = tid_len;
412 *out_tid_len = (add_len + 4);
415 * Check for ',i,0x' separator between iSCSI Name and iSCSI Initiator
416 * Session ID as defined in Table 390 - iSCSI initiator port TransportID
419 if (format_code == 0x40) {
420 p = strstr(&buf[4], ",i,0x");
422 pr_err("Unable to locate \",i,0x\" separator"
423 " for Initiator port identifier: %s\n",
427 *p = '\0'; /* Terminate iSCSI Name */
428 p += 5; /* Skip over ",i,0x" separator */
432 * Go ahead and do the lower case conversion of the received
433 * 12 ASCII characters representing the ISID in the TransportID
434 * for comparison against the running iSCSI session's ISID from
435 * iscsi_target.c:lio_sess_get_initiator_sid()
437 for (i = 0; i < 12; i++) {
447 return (char *)&buf[4];
449 EXPORT_SYMBOL(iscsi_parse_pr_out_transport_id);