1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright 2007-2010 Red Hat, Inc.
4 * by Peter Jones <pjones@redhat.com>
5 * Copyright 2008 IBM, Inc.
6 * by Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
7 * Copyright 2008
8 * by Konrad Rzeszutek <ketuzsezr@darnok.org>
9 *
10 * This code exposes the iSCSI Boot Format Table to userland via sysfs.
11 *
12 * Changelog:
13 *
14 * 06 Jan 2010 - Peter Jones <pjones@redhat.com>
15 * New changelog entries are in the git log from now on. Not here.
16 *
17 * 14 Mar 2008 - Konrad Rzeszutek <ketuzsezr@darnok.org>
18 * Updated comments and copyrights. (v0.4.9)
19 *
20 * 11 Feb 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
21 * Converted to using ibft_addr. (v0.4.8)
22 *
23 * 8 Feb 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
24 * Combined two functions in one: reserve_ibft_region. (v0.4.7)
25 *
26 * 30 Jan 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
27 * Added logic to handle IPv6 addresses. (v0.4.6)
28 *
29 * 25 Jan 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
30 * Added logic to handle badly not-to-spec iBFT. (v0.4.5)
31 *
32 * 4 Jan 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
33 * Added __init to function declarations. (v0.4.4)
34 *
35 * 21 Dec 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
36 * Updated kobject registration, combined unregister functions in one
37 * and code and style cleanup. (v0.4.3)
38 *
39 * 5 Dec 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
40 * Added end-markers to enums and re-organized kobject registration. (v0.4.2)
41 *
42 * 4 Dec 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
43 * Created 'device' sysfs link to the NIC and style cleanup. (v0.4.1)
44 *
45 * 28 Nov 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
46 * Added sysfs-ibft documentation, moved 'find_ibft' function to
47 * in its own file and added text attributes for every struct field. (v0.4)
48 *
49 * 21 Nov 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
50 * Added text attributes emulating OpenFirmware /proc/device-tree naming.
51 * Removed binary /sysfs interface (v0.3)
52 *
53 * 29 Aug 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
54 * Added functionality in setup.c to reserve iBFT region. (v0.2)
55 *
56 * 27 Aug 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
57 * First version exposing iBFT data via a binary /sysfs. (v0.1)
58 */
59
60
61 #include <linux/blkdev.h>
62 #include <linux/capability.h>
63 #include <linux/ctype.h>
64 #include <linux/device.h>
65 #include <linux/err.h>
66 #include <linux/init.h>
67 #include <linux/iscsi_ibft.h>
68 #include <linux/limits.h>
69 #include <linux/module.h>
70 #include <linux/pci.h>
71 #include <linux/slab.h>
72 #include <linux/stat.h>
73 #include <linux/string.h>
74 #include <linux/types.h>
75 #include <linux/acpi.h>
76 #include <linux/iscsi_boot_sysfs.h>
77
78 #define IBFT_ISCSI_VERSION "0.5.0"
79 #define IBFT_ISCSI_DATE "2010-Feb-25"
80
81 MODULE_AUTHOR("Peter Jones <pjones@redhat.com> and "
82 "Konrad Rzeszutek <ketuzsezr@darnok.org>");
83 MODULE_DESCRIPTION("sysfs interface to BIOS iBFT information");
84 MODULE_LICENSE("GPL");
85 MODULE_VERSION(IBFT_ISCSI_VERSION);
86
87 #ifndef CONFIG_ISCSI_IBFT_FIND
88 struct acpi_table_ibft *ibft_addr;
89 #endif
90
91 struct ibft_hdr {
92 u8 id;
93 u8 version;
94 u16 length;
95 u8 index;
96 u8 flags;
97 } __attribute__((__packed__));
98
99 struct ibft_control {
100 struct ibft_hdr hdr;
101 u16 extensions;
102 u16 initiator_off;
103 u16 nic0_off;
104 u16 tgt0_off;
105 u16 nic1_off;
106 u16 tgt1_off;
107 u16 expansion[];
108 } __attribute__((__packed__));
109
110 struct ibft_initiator {
111 struct ibft_hdr hdr;
112 char isns_server[16];
113 char slp_server[16];
114 char pri_radius_server[16];
115 char sec_radius_server[16];
116 u16 initiator_name_len;
117 u16 initiator_name_off;
118 } __attribute__((__packed__));
119
120 struct ibft_nic {
121 struct ibft_hdr hdr;
122 char ip_addr[16];
123 u8 subnet_mask_prefix;
124 u8 origin;
125 char gateway[16];
126 char primary_dns[16];
127 char secondary_dns[16];
128 char dhcp[16];
129 u16 vlan;
130 char mac[6];
131 u16 pci_bdf;
132 u16 hostname_len;
133 u16 hostname_off;
134 } __attribute__((__packed__));
135
136 struct ibft_tgt {
137 struct ibft_hdr hdr;
138 char ip_addr[16];
139 u16 port;
140 char lun[8];
141 u8 chap_type;
142 u8 nic_assoc;
143 u16 tgt_name_len;
144 u16 tgt_name_off;
145 u16 chap_name_len;
146 u16 chap_name_off;
147 u16 chap_secret_len;
148 u16 chap_secret_off;
149 u16 rev_chap_name_len;
150 u16 rev_chap_name_off;
151 u16 rev_chap_secret_len;
152 u16 rev_chap_secret_off;
153 } __attribute__((__packed__));
154
155 /*
156 * The kobject different types and its names.
157 *
158 */
159 enum ibft_id {
160 id_reserved = 0, /* We don't support. */
161 id_control = 1, /* Should show up only once and is not exported. */
162 id_initiator = 2,
163 id_nic = 3,
164 id_target = 4,
165 id_extensions = 5, /* We don't support. */
166 id_end_marker,
167 };
168
169 /*
170 * The kobject and attribute structures.
171 */
172
173 struct ibft_kobject {
174 struct acpi_table_ibft *header;
175 union {
176 struct ibft_initiator *initiator;
177 struct ibft_nic *nic;
178 struct ibft_tgt *tgt;
179 struct ibft_hdr *hdr;
180 };
181 };
182
183 static struct iscsi_boot_kset *boot_kset;
184
185 /* fully null address */
186 static const char nulls[16];
187
188 /* IPv4-mapped IPv6 ::ffff:0.0.0.0 */
189 static const char mapped_nulls[16] = { 0x00, 0x00, 0x00, 0x00,
190 0x00, 0x00, 0x00, 0x00,
191 0x00, 0x00, 0xff, 0xff,
192 0x00, 0x00, 0x00, 0x00 };
193
address_not_null(u8 * ip)194 static int address_not_null(u8 *ip)
195 {
196 return (memcmp(ip, nulls, 16) && memcmp(ip, mapped_nulls, 16));
197 }
198
199 /*
200 * Helper functions to parse data properly.
201 */
sprintf_ipaddr(char * buf,u8 * ip)202 static ssize_t sprintf_ipaddr(char *buf, u8 *ip)
203 {
204 char *str = buf;
205
206 if (ip[0] == 0 && ip[1] == 0 && ip[2] == 0 && ip[3] == 0 &&
207 ip[4] == 0 && ip[5] == 0 && ip[6] == 0 && ip[7] == 0 &&
208 ip[8] == 0 && ip[9] == 0 && ip[10] == 0xff && ip[11] == 0xff) {
209 /*
210 * IPV4
211 */
212 str += sprintf(buf, "%pI4", ip + 12);
213 } else {
214 /*
215 * IPv6
216 */
217 str += sprintf(str, "%pI6", ip);
218 }
219 str += sprintf(str, "\n");
220 return str - buf;
221 }
222
sprintf_string(char * str,int len,char * buf)223 static ssize_t sprintf_string(char *str, int len, char *buf)
224 {
225 return sprintf(str, "%.*s\n", len, buf);
226 }
227
228 /*
229 * Helper function to verify the IBFT header.
230 */
ibft_verify_hdr(char * t,struct ibft_hdr * hdr,int id,int length)231 static int ibft_verify_hdr(char *t, struct ibft_hdr *hdr, int id, int length)
232 {
233 if (hdr->id != id) {
234 printk(KERN_ERR "iBFT error: We expected the %s " \
235 "field header.id to have %d but " \
236 "found %d instead!\n", t, id, hdr->id);
237 return -ENODEV;
238 }
239 if (length && hdr->length != length) {
240 printk(KERN_ERR "iBFT error: We expected the %s " \
241 "field header.length to have %d but " \
242 "found %d instead!\n", t, length, hdr->length);
243 return -ENODEV;
244 }
245
246 return 0;
247 }
248
249 /*
250 * Routines for parsing the iBFT data to be human readable.
251 */
ibft_attr_show_initiator(void * data,int type,char * buf)252 static ssize_t ibft_attr_show_initiator(void *data, int type, char *buf)
253 {
254 struct ibft_kobject *entry = data;
255 struct ibft_initiator *initiator = entry->initiator;
256 void *ibft_loc = entry->header;
257 char *str = buf;
258
259 if (!initiator)
260 return 0;
261
262 switch (type) {
263 case ISCSI_BOOT_INI_INDEX:
264 str += sprintf(str, "%d\n", initiator->hdr.index);
265 break;
266 case ISCSI_BOOT_INI_FLAGS:
267 str += sprintf(str, "%d\n", initiator->hdr.flags);
268 break;
269 case ISCSI_BOOT_INI_ISNS_SERVER:
270 str += sprintf_ipaddr(str, initiator->isns_server);
271 break;
272 case ISCSI_BOOT_INI_SLP_SERVER:
273 str += sprintf_ipaddr(str, initiator->slp_server);
274 break;
275 case ISCSI_BOOT_INI_PRI_RADIUS_SERVER:
276 str += sprintf_ipaddr(str, initiator->pri_radius_server);
277 break;
278 case ISCSI_BOOT_INI_SEC_RADIUS_SERVER:
279 str += sprintf_ipaddr(str, initiator->sec_radius_server);
280 break;
281 case ISCSI_BOOT_INI_INITIATOR_NAME:
282 str += sprintf_string(str, initiator->initiator_name_len,
283 (char *)ibft_loc +
284 initiator->initiator_name_off);
285 break;
286 default:
287 break;
288 }
289
290 return str - buf;
291 }
292
ibft_attr_show_nic(void * data,int type,char * buf)293 static ssize_t ibft_attr_show_nic(void *data, int type, char *buf)
294 {
295 struct ibft_kobject *entry = data;
296 struct ibft_nic *nic = entry->nic;
297 void *ibft_loc = entry->header;
298 char *str = buf;
299 __be32 val;
300
301 if (!nic)
302 return 0;
303
304 switch (type) {
305 case ISCSI_BOOT_ETH_INDEX:
306 str += sprintf(str, "%d\n", nic->hdr.index);
307 break;
308 case ISCSI_BOOT_ETH_FLAGS:
309 str += sprintf(str, "%d\n", nic->hdr.flags);
310 break;
311 case ISCSI_BOOT_ETH_IP_ADDR:
312 str += sprintf_ipaddr(str, nic->ip_addr);
313 break;
314 case ISCSI_BOOT_ETH_SUBNET_MASK:
315 val = cpu_to_be32(~((1 << (32-nic->subnet_mask_prefix))-1));
316 str += sprintf(str, "%pI4", &val);
317 break;
318 case ISCSI_BOOT_ETH_PREFIX_LEN:
319 str += sprintf(str, "%d\n", nic->subnet_mask_prefix);
320 break;
321 case ISCSI_BOOT_ETH_ORIGIN:
322 str += sprintf(str, "%d\n", nic->origin);
323 break;
324 case ISCSI_BOOT_ETH_GATEWAY:
325 str += sprintf_ipaddr(str, nic->gateway);
326 break;
327 case ISCSI_BOOT_ETH_PRIMARY_DNS:
328 str += sprintf_ipaddr(str, nic->primary_dns);
329 break;
330 case ISCSI_BOOT_ETH_SECONDARY_DNS:
331 str += sprintf_ipaddr(str, nic->secondary_dns);
332 break;
333 case ISCSI_BOOT_ETH_DHCP:
334 str += sprintf_ipaddr(str, nic->dhcp);
335 break;
336 case ISCSI_BOOT_ETH_VLAN:
337 str += sprintf(str, "%d\n", nic->vlan);
338 break;
339 case ISCSI_BOOT_ETH_MAC:
340 str += sprintf(str, "%pM\n", nic->mac);
341 break;
342 case ISCSI_BOOT_ETH_HOSTNAME:
343 str += sprintf_string(str, nic->hostname_len,
344 (char *)ibft_loc + nic->hostname_off);
345 break;
346 default:
347 break;
348 }
349
350 return str - buf;
351 };
352
ibft_attr_show_target(void * data,int type,char * buf)353 static ssize_t ibft_attr_show_target(void *data, int type, char *buf)
354 {
355 struct ibft_kobject *entry = data;
356 struct ibft_tgt *tgt = entry->tgt;
357 void *ibft_loc = entry->header;
358 char *str = buf;
359 int i;
360
361 if (!tgt)
362 return 0;
363
364 switch (type) {
365 case ISCSI_BOOT_TGT_INDEX:
366 str += sprintf(str, "%d\n", tgt->hdr.index);
367 break;
368 case ISCSI_BOOT_TGT_FLAGS:
369 str += sprintf(str, "%d\n", tgt->hdr.flags);
370 break;
371 case ISCSI_BOOT_TGT_IP_ADDR:
372 str += sprintf_ipaddr(str, tgt->ip_addr);
373 break;
374 case ISCSI_BOOT_TGT_PORT:
375 str += sprintf(str, "%d\n", tgt->port);
376 break;
377 case ISCSI_BOOT_TGT_LUN:
378 for (i = 0; i < 8; i++)
379 str += sprintf(str, "%x", (u8)tgt->lun[i]);
380 str += sprintf(str, "\n");
381 break;
382 case ISCSI_BOOT_TGT_NIC_ASSOC:
383 str += sprintf(str, "%d\n", tgt->nic_assoc);
384 break;
385 case ISCSI_BOOT_TGT_CHAP_TYPE:
386 str += sprintf(str, "%d\n", tgt->chap_type);
387 break;
388 case ISCSI_BOOT_TGT_NAME:
389 str += sprintf_string(str, tgt->tgt_name_len,
390 (char *)ibft_loc + tgt->tgt_name_off);
391 break;
392 case ISCSI_BOOT_TGT_CHAP_NAME:
393 str += sprintf_string(str, tgt->chap_name_len,
394 (char *)ibft_loc + tgt->chap_name_off);
395 break;
396 case ISCSI_BOOT_TGT_CHAP_SECRET:
397 str += sprintf_string(str, tgt->chap_secret_len,
398 (char *)ibft_loc + tgt->chap_secret_off);
399 break;
400 case ISCSI_BOOT_TGT_REV_CHAP_NAME:
401 str += sprintf_string(str, tgt->rev_chap_name_len,
402 (char *)ibft_loc +
403 tgt->rev_chap_name_off);
404 break;
405 case ISCSI_BOOT_TGT_REV_CHAP_SECRET:
406 str += sprintf_string(str, tgt->rev_chap_secret_len,
407 (char *)ibft_loc +
408 tgt->rev_chap_secret_off);
409 break;
410 default:
411 break;
412 }
413
414 return str - buf;
415 }
416
ibft_attr_show_acpitbl(void * data,int type,char * buf)417 static ssize_t ibft_attr_show_acpitbl(void *data, int type, char *buf)
418 {
419 struct ibft_kobject *entry = data;
420 char *str = buf;
421
422 switch (type) {
423 case ISCSI_BOOT_ACPITBL_SIGNATURE:
424 str += sprintf_string(str, ACPI_NAMESEG_SIZE,
425 entry->header->header.signature);
426 break;
427 case ISCSI_BOOT_ACPITBL_OEM_ID:
428 str += sprintf_string(str, ACPI_OEM_ID_SIZE,
429 entry->header->header.oem_id);
430 break;
431 case ISCSI_BOOT_ACPITBL_OEM_TABLE_ID:
432 str += sprintf_string(str, ACPI_OEM_TABLE_ID_SIZE,
433 entry->header->header.oem_table_id);
434 break;
435 default:
436 break;
437 }
438
439 return str - buf;
440 }
441
ibft_check_device(void)442 static int __init ibft_check_device(void)
443 {
444 int len;
445 u8 *pos;
446 u8 csum = 0;
447
448 len = ibft_addr->header.length;
449
450 /* Sanity checking of iBFT. */
451 if (ibft_addr->header.revision != 1) {
452 printk(KERN_ERR "iBFT module supports only revision 1, " \
453 "while this is %d.\n",
454 ibft_addr->header.revision);
455 return -ENOENT;
456 }
457 for (pos = (u8 *)ibft_addr; pos < (u8 *)ibft_addr + len; pos++)
458 csum += *pos;
459
460 if (csum) {
461 printk(KERN_ERR "iBFT has incorrect checksum (0x%x)!\n", csum);
462 return -ENOENT;
463 }
464
465 return 0;
466 }
467
468 /*
469 * Helper routiners to check to determine if the entry is valid
470 * in the proper iBFT structure.
471 */
ibft_check_nic_for(void * data,int type)472 static umode_t ibft_check_nic_for(void *data, int type)
473 {
474 struct ibft_kobject *entry = data;
475 struct ibft_nic *nic = entry->nic;
476 umode_t rc = 0;
477
478 switch (type) {
479 case ISCSI_BOOT_ETH_INDEX:
480 case ISCSI_BOOT_ETH_FLAGS:
481 rc = S_IRUGO;
482 break;
483 case ISCSI_BOOT_ETH_IP_ADDR:
484 if (address_not_null(nic->ip_addr))
485 rc = S_IRUGO;
486 break;
487 case ISCSI_BOOT_ETH_PREFIX_LEN:
488 case ISCSI_BOOT_ETH_SUBNET_MASK:
489 if (nic->subnet_mask_prefix)
490 rc = S_IRUGO;
491 break;
492 case ISCSI_BOOT_ETH_ORIGIN:
493 rc = S_IRUGO;
494 break;
495 case ISCSI_BOOT_ETH_GATEWAY:
496 if (address_not_null(nic->gateway))
497 rc = S_IRUGO;
498 break;
499 case ISCSI_BOOT_ETH_PRIMARY_DNS:
500 if (address_not_null(nic->primary_dns))
501 rc = S_IRUGO;
502 break;
503 case ISCSI_BOOT_ETH_SECONDARY_DNS:
504 if (address_not_null(nic->secondary_dns))
505 rc = S_IRUGO;
506 break;
507 case ISCSI_BOOT_ETH_DHCP:
508 if (address_not_null(nic->dhcp))
509 rc = S_IRUGO;
510 break;
511 case ISCSI_BOOT_ETH_VLAN:
512 case ISCSI_BOOT_ETH_MAC:
513 rc = S_IRUGO;
514 break;
515 case ISCSI_BOOT_ETH_HOSTNAME:
516 if (nic->hostname_off)
517 rc = S_IRUGO;
518 break;
519 default:
520 break;
521 }
522
523 return rc;
524 }
525
ibft_check_tgt_for(void * data,int type)526 static umode_t __init ibft_check_tgt_for(void *data, int type)
527 {
528 struct ibft_kobject *entry = data;
529 struct ibft_tgt *tgt = entry->tgt;
530 umode_t rc = 0;
531
532 switch (type) {
533 case ISCSI_BOOT_TGT_INDEX:
534 case ISCSI_BOOT_TGT_FLAGS:
535 case ISCSI_BOOT_TGT_IP_ADDR:
536 case ISCSI_BOOT_TGT_PORT:
537 case ISCSI_BOOT_TGT_LUN:
538 case ISCSI_BOOT_TGT_NIC_ASSOC:
539 case ISCSI_BOOT_TGT_CHAP_TYPE:
540 rc = S_IRUGO;
541 break;
542 case ISCSI_BOOT_TGT_NAME:
543 if (tgt->tgt_name_len)
544 rc = S_IRUGO;
545 break;
546 case ISCSI_BOOT_TGT_CHAP_NAME:
547 case ISCSI_BOOT_TGT_CHAP_SECRET:
548 if (tgt->chap_name_len)
549 rc = S_IRUGO;
550 break;
551 case ISCSI_BOOT_TGT_REV_CHAP_NAME:
552 case ISCSI_BOOT_TGT_REV_CHAP_SECRET:
553 if (tgt->rev_chap_name_len)
554 rc = S_IRUGO;
555 break;
556 default:
557 break;
558 }
559
560 return rc;
561 }
562
ibft_check_initiator_for(void * data,int type)563 static umode_t __init ibft_check_initiator_for(void *data, int type)
564 {
565 struct ibft_kobject *entry = data;
566 struct ibft_initiator *init = entry->initiator;
567 umode_t rc = 0;
568
569 switch (type) {
570 case ISCSI_BOOT_INI_INDEX:
571 case ISCSI_BOOT_INI_FLAGS:
572 rc = S_IRUGO;
573 break;
574 case ISCSI_BOOT_INI_ISNS_SERVER:
575 if (address_not_null(init->isns_server))
576 rc = S_IRUGO;
577 break;
578 case ISCSI_BOOT_INI_SLP_SERVER:
579 if (address_not_null(init->slp_server))
580 rc = S_IRUGO;
581 break;
582 case ISCSI_BOOT_INI_PRI_RADIUS_SERVER:
583 if (address_not_null(init->pri_radius_server))
584 rc = S_IRUGO;
585 break;
586 case ISCSI_BOOT_INI_SEC_RADIUS_SERVER:
587 if (address_not_null(init->sec_radius_server))
588 rc = S_IRUGO;
589 break;
590 case ISCSI_BOOT_INI_INITIATOR_NAME:
591 if (init->initiator_name_len)
592 rc = S_IRUGO;
593 break;
594 default:
595 break;
596 }
597
598 return rc;
599 }
600
ibft_check_acpitbl_for(void * data,int type)601 static umode_t __init ibft_check_acpitbl_for(void *data, int type)
602 {
603
604 umode_t rc = 0;
605
606 switch (type) {
607 case ISCSI_BOOT_ACPITBL_SIGNATURE:
608 case ISCSI_BOOT_ACPITBL_OEM_ID:
609 case ISCSI_BOOT_ACPITBL_OEM_TABLE_ID:
610 rc = S_IRUGO;
611 break;
612 default:
613 break;
614 }
615
616 return rc;
617 }
618
ibft_kobj_release(void * data)619 static void ibft_kobj_release(void *data)
620 {
621 kfree(data);
622 }
623
624 /*
625 * Helper function for ibft_register_kobjects.
626 */
ibft_create_kobject(struct acpi_table_ibft * header,struct ibft_hdr * hdr)627 static int __init ibft_create_kobject(struct acpi_table_ibft *header,
628 struct ibft_hdr *hdr)
629 {
630 struct iscsi_boot_kobj *boot_kobj = NULL;
631 struct ibft_kobject *ibft_kobj = NULL;
632 struct ibft_nic *nic = (struct ibft_nic *)hdr;
633 struct pci_dev *pci_dev;
634 int rc = 0;
635
636 ibft_kobj = kzalloc(sizeof(*ibft_kobj), GFP_KERNEL);
637 if (!ibft_kobj)
638 return -ENOMEM;
639
640 ibft_kobj->header = header;
641 ibft_kobj->hdr = hdr;
642
643 switch (hdr->id) {
644 case id_initiator:
645 rc = ibft_verify_hdr("initiator", hdr, id_initiator,
646 sizeof(*ibft_kobj->initiator));
647 if (rc)
648 break;
649
650 boot_kobj = iscsi_boot_create_initiator(boot_kset, hdr->index,
651 ibft_kobj,
652 ibft_attr_show_initiator,
653 ibft_check_initiator_for,
654 ibft_kobj_release);
655 if (!boot_kobj) {
656 rc = -ENOMEM;
657 goto free_ibft_obj;
658 }
659 break;
660 case id_nic:
661 rc = ibft_verify_hdr("ethernet", hdr, id_nic,
662 sizeof(*ibft_kobj->nic));
663 if (rc)
664 break;
665
666 boot_kobj = iscsi_boot_create_ethernet(boot_kset, hdr->index,
667 ibft_kobj,
668 ibft_attr_show_nic,
669 ibft_check_nic_for,
670 ibft_kobj_release);
671 if (!boot_kobj) {
672 rc = -ENOMEM;
673 goto free_ibft_obj;
674 }
675 break;
676 case id_target:
677 rc = ibft_verify_hdr("target", hdr, id_target,
678 sizeof(*ibft_kobj->tgt));
679 if (rc)
680 break;
681
682 boot_kobj = iscsi_boot_create_target(boot_kset, hdr->index,
683 ibft_kobj,
684 ibft_attr_show_target,
685 ibft_check_tgt_for,
686 ibft_kobj_release);
687 if (!boot_kobj) {
688 rc = -ENOMEM;
689 goto free_ibft_obj;
690 }
691 break;
692 case id_reserved:
693 case id_control:
694 case id_extensions:
695 /* Fields which we don't support. Ignore them */
696 rc = 1;
697 break;
698 default:
699 printk(KERN_ERR "iBFT has unknown structure type (%d). " \
700 "Report this bug to %.6s!\n", hdr->id,
701 header->header.oem_id);
702 rc = 1;
703 break;
704 }
705
706 if (rc) {
707 /* Skip adding this kobject, but exit with non-fatal error. */
708 rc = 0;
709 goto free_ibft_obj;
710 }
711
712 if (hdr->id == id_nic) {
713 /*
714 * We don't search for the device in other domains than
715 * zero. This is because on x86 platforms the BIOS
716 * executes only devices which are in domain 0. Furthermore, the
717 * iBFT spec doesn't have a domain id field :-(
718 */
719 pci_dev = pci_get_domain_bus_and_slot(0,
720 (nic->pci_bdf & 0xff00) >> 8,
721 (nic->pci_bdf & 0xff));
722 if (pci_dev) {
723 rc = sysfs_create_link(&boot_kobj->kobj,
724 &pci_dev->dev.kobj, "device");
725 pci_dev_put(pci_dev);
726 }
727 }
728 return 0;
729
730 free_ibft_obj:
731 kfree(ibft_kobj);
732 return rc;
733 }
734
735 /*
736 * Scan the IBFT table structure for the NIC and Target fields. When
737 * found add them on the passed-in list. We do not support the other
738 * fields at this point, so they are skipped.
739 */
ibft_register_kobjects(struct acpi_table_ibft * header)740 static int __init ibft_register_kobjects(struct acpi_table_ibft *header)
741 {
742 struct ibft_control *control = NULL;
743 struct iscsi_boot_kobj *boot_kobj;
744 struct ibft_kobject *ibft_kobj;
745 void *ptr, *end;
746 int rc = 0;
747 u16 offset;
748 u16 eot_offset;
749
750 control = (void *)header + sizeof(*header);
751 end = (void *)control + control->hdr.length;
752 eot_offset = (void *)header + header->header.length - (void *)control;
753 rc = ibft_verify_hdr("control", (struct ibft_hdr *)control, id_control, 0);
754
755 /* iBFT table safety checking */
756 rc |= ((control->hdr.index) ? -ENODEV : 0);
757 rc |= ((control->hdr.length < sizeof(*control)) ? -ENODEV : 0);
758 if (rc) {
759 printk(KERN_ERR "iBFT error: Control header is invalid!\n");
760 return rc;
761 }
762 for (ptr = &control->initiator_off; ptr + sizeof(u16) <= end; ptr += sizeof(u16)) {
763 offset = *(u16 *)ptr;
764 if (offset && offset < header->header.length &&
765 offset < eot_offset) {
766 rc = ibft_create_kobject(header,
767 (void *)header + offset);
768 if (rc)
769 break;
770 }
771 }
772 if (rc)
773 return rc;
774
775 ibft_kobj = kzalloc(sizeof(*ibft_kobj), GFP_KERNEL);
776 if (!ibft_kobj)
777 return -ENOMEM;
778
779 ibft_kobj->header = header;
780 ibft_kobj->hdr = NULL; /*for ibft_unregister*/
781
782 boot_kobj = iscsi_boot_create_acpitbl(boot_kset, 0,
783 ibft_kobj,
784 ibft_attr_show_acpitbl,
785 ibft_check_acpitbl_for,
786 ibft_kobj_release);
787 if (!boot_kobj) {
788 kfree(ibft_kobj);
789 rc = -ENOMEM;
790 }
791
792 return rc;
793 }
794
ibft_unregister(void)795 static void ibft_unregister(void)
796 {
797 struct iscsi_boot_kobj *boot_kobj, *tmp_kobj;
798 struct ibft_kobject *ibft_kobj;
799
800 list_for_each_entry_safe(boot_kobj, tmp_kobj,
801 &boot_kset->kobj_list, list) {
802 ibft_kobj = boot_kobj->data;
803 if (ibft_kobj->hdr && ibft_kobj->hdr->id == id_nic)
804 sysfs_remove_link(&boot_kobj->kobj, "device");
805 };
806 }
807
ibft_cleanup(void)808 static void ibft_cleanup(void)
809 {
810 if (boot_kset) {
811 ibft_unregister();
812 iscsi_boot_destroy_kset(boot_kset);
813 }
814 }
815
ibft_exit(void)816 static void __exit ibft_exit(void)
817 {
818 ibft_cleanup();
819 }
820
821 #ifdef CONFIG_ACPI
822 static const struct {
823 char *sign;
824 } ibft_signs[] = {
825 /*
826 * One spec says "IBFT", the other says "iBFT". We have to check
827 * for both.
828 */
829 { ACPI_SIG_IBFT },
830 { "iBFT" },
831 { "BIFT" }, /* Broadcom iSCSI Offload */
832 };
833
acpi_find_ibft_region(void)834 static void __init acpi_find_ibft_region(void)
835 {
836 int i;
837 struct acpi_table_header *table = NULL;
838
839 if (acpi_disabled)
840 return;
841
842 for (i = 0; i < ARRAY_SIZE(ibft_signs) && !ibft_addr; i++) {
843 acpi_get_table(ibft_signs[i].sign, 0, &table);
844 ibft_addr = (struct acpi_table_ibft *)table;
845 }
846 }
847 #else
acpi_find_ibft_region(void)848 static void __init acpi_find_ibft_region(void)
849 {
850 }
851 #endif
852
853 /*
854 * ibft_init() - creates sysfs tree entries for the iBFT data.
855 */
ibft_init(void)856 static int __init ibft_init(void)
857 {
858 int rc = 0;
859
860 /*
861 As on UEFI systems the setup_arch()/find_ibft_region()
862 is called before ACPI tables are parsed and it only does
863 legacy finding.
864 */
865 if (!ibft_addr)
866 acpi_find_ibft_region();
867
868 if (ibft_addr) {
869 pr_info("iBFT detected.\n");
870
871 rc = ibft_check_device();
872 if (rc)
873 return rc;
874
875 boot_kset = iscsi_boot_create_kset("ibft");
876 if (!boot_kset)
877 return -ENOMEM;
878
879 /* Scan the IBFT for data and register the kobjects. */
880 rc = ibft_register_kobjects(ibft_addr);
881 if (rc)
882 goto out_free;
883 } else
884 printk(KERN_INFO "No iBFT detected.\n");
885
886 return 0;
887
888 out_free:
889 ibft_cleanup();
890 return rc;
891 }
892
893 module_init(ibft_init);
894 module_exit(ibft_exit);
895
