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1/*
2 * Copyright 2007-2010 Red Hat, Inc.
3 * by Peter Jones <pjones@redhat.com>
4 * Copyright 2008 IBM, Inc.
5 * by Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
6 * Copyright 2008
7 * by Konrad Rzeszutek <ketuzsezr@darnok.org>
8 *
9 * This code exposes the iSCSI Boot Format Table to userland via sysfs.
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License v2.0 as published by
13 * the Free Software Foundation
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * Changelog:
21 *
22 * 06 Jan 2010 - Peter Jones <pjones@redhat.com>
23 * New changelog entries are in the git log from now on. Not here.
24 *
25 * 14 Mar 2008 - Konrad Rzeszutek <ketuzsezr@darnok.org>
26 * Updated comments and copyrights. (v0.4.9)
27 *
28 * 11 Feb 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
29 * Converted to using ibft_addr. (v0.4.8)
30 *
31 * 8 Feb 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
32 * Combined two functions in one: reserve_ibft_region. (v0.4.7)
33 *
34 * 30 Jan 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
35 * Added logic to handle IPv6 addresses. (v0.4.6)
36 *
37 * 25 Jan 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
38 * Added logic to handle badly not-to-spec iBFT. (v0.4.5)
39 *
40 * 4 Jan 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
41 * Added __init to function declarations. (v0.4.4)
42 *
43 * 21 Dec 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
44 * Updated kobject registration, combined unregister functions in one
45 * and code and style cleanup. (v0.4.3)
46 *
47 * 5 Dec 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
48 * Added end-markers to enums and re-organized kobject registration. (v0.4.2)
49 *
50 * 4 Dec 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
51 * Created 'device' sysfs link to the NIC and style cleanup. (v0.4.1)
52 *
53 * 28 Nov 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
54 * Added sysfs-ibft documentation, moved 'find_ibft' function to
55 * in its own file and added text attributes for every struct field. (v0.4)
56 *
57 * 21 Nov 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
58 * Added text attributes emulating OpenFirmware /proc/device-tree naming.
59 * Removed binary /sysfs interface (v0.3)
60 *
61 * 29 Aug 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
62 * Added functionality in setup.c to reserve iBFT region. (v0.2)
63 *
64 * 27 Aug 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
65 * First version exposing iBFT data via a binary /sysfs. (v0.1)
66 *
67 */
68
69
70#include <linux/blkdev.h>
71#include <linux/capability.h>
72#include <linux/ctype.h>
73#include <linux/device.h>
74#include <linux/err.h>
75#include <linux/init.h>
76#include <linux/iscsi_ibft.h>
77#include <linux/limits.h>
78#include <linux/module.h>
79#include <linux/pci.h>
80#include <linux/slab.h>
81#include <linux/stat.h>
82#include <linux/string.h>
83#include <linux/types.h>
84#include <linux/acpi.h>
85#include <linux/iscsi_boot_sysfs.h>
86
87#define IBFT_ISCSI_VERSION "0.5.0"
88#define IBFT_ISCSI_DATE "2010-Feb-25"
89
90MODULE_AUTHOR("Peter Jones <pjones@redhat.com> and "
91 "Konrad Rzeszutek <ketuzsezr@darnok.org>");
92MODULE_DESCRIPTION("sysfs interface to BIOS iBFT information");
93MODULE_LICENSE("GPL");
94MODULE_VERSION(IBFT_ISCSI_VERSION);
95
96struct ibft_hdr {
97 u8 id;
98 u8 version;
99 u16 length;
100 u8 index;
101 u8 flags;
102} __attribute__((__packed__));
103
104struct ibft_control {
105 struct ibft_hdr hdr;
106 u16 extensions;
107 u16 initiator_off;
108 u16 nic0_off;
109 u16 tgt0_off;
110 u16 nic1_off;
111 u16 tgt1_off;
112} __attribute__((__packed__));
113
114struct ibft_initiator {
115 struct ibft_hdr hdr;
116 char isns_server[16];
117 char slp_server[16];
118 char pri_radius_server[16];
119 char sec_radius_server[16];
120 u16 initiator_name_len;
121 u16 initiator_name_off;
122} __attribute__((__packed__));
123
124struct ibft_nic {
125 struct ibft_hdr hdr;
126 char ip_addr[16];
127 u8 subnet_mask_prefix;
128 u8 origin;
129 char gateway[16];
130 char primary_dns[16];
131 char secondary_dns[16];
132 char dhcp[16];
133 u16 vlan;
134 char mac[6];
135 u16 pci_bdf;
136 u16 hostname_len;
137 u16 hostname_off;
138} __attribute__((__packed__));
139
140struct ibft_tgt {
141 struct ibft_hdr hdr;
142 char ip_addr[16];
143 u16 port;
144 char lun[8];
145 u8 chap_type;
146 u8 nic_assoc;
147 u16 tgt_name_len;
148 u16 tgt_name_off;
149 u16 chap_name_len;
150 u16 chap_name_off;
151 u16 chap_secret_len;
152 u16 chap_secret_off;
153 u16 rev_chap_name_len;
154 u16 rev_chap_name_off;
155 u16 rev_chap_secret_len;
156 u16 rev_chap_secret_off;
157} __attribute__((__packed__));
158
159/*
160 * The kobject different types and its names.
161 *
162*/
163enum ibft_id {
164 id_reserved = 0, /* We don't support. */
165 id_control = 1, /* Should show up only once and is not exported. */
166 id_initiator = 2,
167 id_nic = 3,
168 id_target = 4,
169 id_extensions = 5, /* We don't support. */
170 id_end_marker,
171};
172
173/*
174 * The kobject and attribute structures.
175 */
176
177struct ibft_kobject {
178 struct acpi_table_ibft *header;
179 union {
180 struct ibft_initiator *initiator;
181 struct ibft_nic *nic;
182 struct ibft_tgt *tgt;
183 struct ibft_hdr *hdr;
184 };
185};
186
187static struct iscsi_boot_kset *boot_kset;
188
189static const char nulls[16];
190
191/*
192 * Helper functions to parse data properly.
193 */
194static ssize_t sprintf_ipaddr(char *buf, u8 *ip)
195{
196 char *str = buf;
197
198 if (ip[0] == 0 && ip[1] == 0 && ip[2] == 0 && ip[3] == 0 &&
199 ip[4] == 0 && ip[5] == 0 && ip[6] == 0 && ip[7] == 0 &&
200 ip[8] == 0 && ip[9] == 0 && ip[10] == 0xff && ip[11] == 0xff) {
201 /*
202 * IPV4
203 */
204 str += sprintf(buf, "%pI4", ip + 12);
205 } else {
206 /*
207 * IPv6
208 */
209 str += sprintf(str, "%pI6", ip);
210 }
211 str += sprintf(str, "\n");
212 return str - buf;
213}
214
215static ssize_t sprintf_string(char *str, int len, char *buf)
216{
217 return sprintf(str, "%.*s\n", len, buf);
218}
219
220/*
221 * Helper function to verify the IBFT header.
222 */
223static int ibft_verify_hdr(char *t, struct ibft_hdr *hdr, int id, int length)
224{
225 if (hdr->id != id) {
226 printk(KERN_ERR "iBFT error: We expected the %s " \
227 "field header.id to have %d but " \
228 "found %d instead!\n", t, id, hdr->id);
229 return -ENODEV;
230 }
231 if (hdr->length != length) {
232 printk(KERN_ERR "iBFT error: We expected the %s " \
233 "field header.length to have %d but " \
234 "found %d instead!\n", t, length, hdr->length);
235 return -ENODEV;
236 }
237
238 return 0;
239}
240
241/*
242 * Routines for parsing the iBFT data to be human readable.
243 */
244static ssize_t ibft_attr_show_initiator(void *data, int type, char *buf)
245{
246 struct ibft_kobject *entry = data;
247 struct ibft_initiator *initiator = entry->initiator;
248 void *ibft_loc = entry->header;
249 char *str = buf;
250
251 if (!initiator)
252 return 0;
253
254 switch (type) {
255 case ISCSI_BOOT_INI_INDEX:
256 str += sprintf(str, "%d\n", initiator->hdr.index);
257 break;
258 case ISCSI_BOOT_INI_FLAGS:
259 str += sprintf(str, "%d\n", initiator->hdr.flags);
260 break;
261 case ISCSI_BOOT_INI_ISNS_SERVER:
262 str += sprintf_ipaddr(str, initiator->isns_server);
263 break;
264 case ISCSI_BOOT_INI_SLP_SERVER:
265 str += sprintf_ipaddr(str, initiator->slp_server);
266 break;
267 case ISCSI_BOOT_INI_PRI_RADIUS_SERVER:
268 str += sprintf_ipaddr(str, initiator->pri_radius_server);
269 break;
270 case ISCSI_BOOT_INI_SEC_RADIUS_SERVER:
271 str += sprintf_ipaddr(str, initiator->sec_radius_server);
272 break;
273 case ISCSI_BOOT_INI_INITIATOR_NAME:
274 str += sprintf_string(str, initiator->initiator_name_len,
275 (char *)ibft_loc +
276 initiator->initiator_name_off);
277 break;
278 default:
279 break;
280 }
281
282 return str - buf;
283}
284
285static ssize_t ibft_attr_show_nic(void *data, int type, char *buf)
286{
287 struct ibft_kobject *entry = data;
288 struct ibft_nic *nic = entry->nic;
289 void *ibft_loc = entry->header;
290 char *str = buf;
291 __be32 val;
292
293 if (!nic)
294 return 0;
295
296 switch (type) {
297 case ISCSI_BOOT_ETH_INDEX:
298 str += sprintf(str, "%d\n", nic->hdr.index);
299 break;
300 case ISCSI_BOOT_ETH_FLAGS:
301 str += sprintf(str, "%d\n", nic->hdr.flags);
302 break;
303 case ISCSI_BOOT_ETH_IP_ADDR:
304 str += sprintf_ipaddr(str, nic->ip_addr);
305 break;
306 case ISCSI_BOOT_ETH_SUBNET_MASK:
307 val = cpu_to_be32(~((1 << (32-nic->subnet_mask_prefix))-1));
308 str += sprintf(str, "%pI4", &val);
309 break;
310 case ISCSI_BOOT_ETH_ORIGIN:
311 str += sprintf(str, "%d\n", nic->origin);
312 break;
313 case ISCSI_BOOT_ETH_GATEWAY:
314 str += sprintf_ipaddr(str, nic->gateway);
315 break;
316 case ISCSI_BOOT_ETH_PRIMARY_DNS:
317 str += sprintf_ipaddr(str, nic->primary_dns);
318 break;
319 case ISCSI_BOOT_ETH_SECONDARY_DNS:
320 str += sprintf_ipaddr(str, nic->secondary_dns);
321 break;
322 case ISCSI_BOOT_ETH_DHCP:
323 str += sprintf_ipaddr(str, nic->dhcp);
324 break;
325 case ISCSI_BOOT_ETH_VLAN:
326 str += sprintf(str, "%d\n", nic->vlan);
327 break;
328 case ISCSI_BOOT_ETH_MAC:
329 str += sprintf(str, "%pM\n", nic->mac);
330 break;
331 case ISCSI_BOOT_ETH_HOSTNAME:
332 str += sprintf_string(str, nic->hostname_len,
333 (char *)ibft_loc + nic->hostname_off);
334 break;
335 default:
336 break;
337 }
338
339 return str - buf;
340};
341
342static ssize_t ibft_attr_show_target(void *data, int type, char *buf)
343{
344 struct ibft_kobject *entry = data;
345 struct ibft_tgt *tgt = entry->tgt;
346 void *ibft_loc = entry->header;
347 char *str = buf;
348 int i;
349
350 if (!tgt)
351 return 0;
352
353 switch (type) {
354 case ISCSI_BOOT_TGT_INDEX:
355 str += sprintf(str, "%d\n", tgt->hdr.index);
356 break;
357 case ISCSI_BOOT_TGT_FLAGS:
358 str += sprintf(str, "%d\n", tgt->hdr.flags);
359 break;
360 case ISCSI_BOOT_TGT_IP_ADDR:
361 str += sprintf_ipaddr(str, tgt->ip_addr);
362 break;
363 case ISCSI_BOOT_TGT_PORT:
364 str += sprintf(str, "%d\n", tgt->port);
365 break;
366 case ISCSI_BOOT_TGT_LUN:
367 for (i = 0; i < 8; i++)
368 str += sprintf(str, "%x", (u8)tgt->lun[i]);
369 str += sprintf(str, "\n");
370 break;
371 case ISCSI_BOOT_TGT_NIC_ASSOC:
372 str += sprintf(str, "%d\n", tgt->nic_assoc);
373 break;
374 case ISCSI_BOOT_TGT_CHAP_TYPE:
375 str += sprintf(str, "%d\n", tgt->chap_type);
376 break;
377 case ISCSI_BOOT_TGT_NAME:
378 str += sprintf_string(str, tgt->tgt_name_len,
379 (char *)ibft_loc + tgt->tgt_name_off);
380 break;
381 case ISCSI_BOOT_TGT_CHAP_NAME:
382 str += sprintf_string(str, tgt->chap_name_len,
383 (char *)ibft_loc + tgt->chap_name_off);
384 break;
385 case ISCSI_BOOT_TGT_CHAP_SECRET:
386 str += sprintf_string(str, tgt->chap_secret_len,
387 (char *)ibft_loc + tgt->chap_secret_off);
388 break;
389 case ISCSI_BOOT_TGT_REV_CHAP_NAME:
390 str += sprintf_string(str, tgt->rev_chap_name_len,
391 (char *)ibft_loc +
392 tgt->rev_chap_name_off);
393 break;
394 case ISCSI_BOOT_TGT_REV_CHAP_SECRET:
395 str += sprintf_string(str, tgt->rev_chap_secret_len,
396 (char *)ibft_loc +
397 tgt->rev_chap_secret_off);
398 break;
399 default:
400 break;
401 }
402
403 return str - buf;
404}
405
406static int __init ibft_check_device(void)
407{
408 int len;
409 u8 *pos;
410 u8 csum = 0;
411
412 len = ibft_addr->header.length;
413
414 /* Sanity checking of iBFT. */
415 if (ibft_addr->header.revision != 1) {
416 printk(KERN_ERR "iBFT module supports only revision 1, " \
417 "while this is %d.\n",
418 ibft_addr->header.revision);
419 return -ENOENT;
420 }
421 for (pos = (u8 *)ibft_addr; pos < (u8 *)ibft_addr + len; pos++)
422 csum += *pos;
423
424 if (csum) {
425 printk(KERN_ERR "iBFT has incorrect checksum (0x%x)!\n", csum);
426 return -ENOENT;
427 }
428
429 return 0;
430}
431
432/*
433 * Helper routiners to check to determine if the entry is valid
434 * in the proper iBFT structure.
435 */
436static mode_t ibft_check_nic_for(void *data, int type)
437{
438 struct ibft_kobject *entry = data;
439 struct ibft_nic *nic = entry->nic;
440 mode_t rc = 0;
441
442 switch (type) {
443 case ISCSI_BOOT_ETH_INDEX:
444 case ISCSI_BOOT_ETH_FLAGS:
445 rc = S_IRUGO;
446 break;
447 case ISCSI_BOOT_ETH_IP_ADDR:
448 if (memcmp(nic->ip_addr, nulls, sizeof(nic->ip_addr)))
449 rc = S_IRUGO;
450 break;
451 case ISCSI_BOOT_ETH_SUBNET_MASK:
452 if (nic->subnet_mask_prefix)
453 rc = S_IRUGO;
454 break;
455 case ISCSI_BOOT_ETH_ORIGIN:
456 rc = S_IRUGO;
457 break;
458 case ISCSI_BOOT_ETH_GATEWAY:
459 if (memcmp(nic->gateway, nulls, sizeof(nic->gateway)))
460 rc = S_IRUGO;
461 break;
462 case ISCSI_BOOT_ETH_PRIMARY_DNS:
463 if (memcmp(nic->primary_dns, nulls,
464 sizeof(nic->primary_dns)))
465 rc = S_IRUGO;
466 break;
467 case ISCSI_BOOT_ETH_SECONDARY_DNS:
468 if (memcmp(nic->secondary_dns, nulls,
469 sizeof(nic->secondary_dns)))
470 rc = S_IRUGO;
471 break;
472 case ISCSI_BOOT_ETH_DHCP:
473 if (memcmp(nic->dhcp, nulls, sizeof(nic->dhcp)))
474 rc = S_IRUGO;
475 break;
476 case ISCSI_BOOT_ETH_VLAN:
477 case ISCSI_BOOT_ETH_MAC:
478 rc = S_IRUGO;
479 break;
480 case ISCSI_BOOT_ETH_HOSTNAME:
481 if (nic->hostname_off)
482 rc = S_IRUGO;
483 break;
484 default:
485 break;
486 }
487
488 return rc;
489}
490
491static mode_t __init ibft_check_tgt_for(void *data, int type)
492{
493 struct ibft_kobject *entry = data;
494 struct ibft_tgt *tgt = entry->tgt;
495 mode_t rc = 0;
496
497 switch (type) {
498 case ISCSI_BOOT_TGT_INDEX:
499 case ISCSI_BOOT_TGT_FLAGS:
500 case ISCSI_BOOT_TGT_IP_ADDR:
501 case ISCSI_BOOT_TGT_PORT:
502 case ISCSI_BOOT_TGT_LUN:
503 case ISCSI_BOOT_TGT_NIC_ASSOC:
504 case ISCSI_BOOT_TGT_CHAP_TYPE:
505 rc = S_IRUGO;
506 case ISCSI_BOOT_TGT_NAME:
507 if (tgt->tgt_name_len)
508 rc = S_IRUGO;
509 break;
510 case ISCSI_BOOT_TGT_CHAP_NAME:
511 case ISCSI_BOOT_TGT_CHAP_SECRET:
512 if (tgt->chap_name_len)
513 rc = S_IRUGO;
514 break;
515 case ISCSI_BOOT_TGT_REV_CHAP_NAME:
516 case ISCSI_BOOT_TGT_REV_CHAP_SECRET:
517 if (tgt->rev_chap_name_len)
518 rc = S_IRUGO;
519 break;
520 default:
521 break;
522 }
523
524 return rc;
525}
526
527static mode_t __init ibft_check_initiator_for(void *data, int type)
528{
529 struct ibft_kobject *entry = data;
530 struct ibft_initiator *init = entry->initiator;
531 mode_t rc = 0;
532
533 switch (type) {
534 case ISCSI_BOOT_INI_INDEX:
535 case ISCSI_BOOT_INI_FLAGS:
536 rc = S_IRUGO;
537 break;
538 case ISCSI_BOOT_INI_ISNS_SERVER:
539 if (memcmp(init->isns_server, nulls,
540 sizeof(init->isns_server)))
541 rc = S_IRUGO;
542 break;
543 case ISCSI_BOOT_INI_SLP_SERVER:
544 if (memcmp(init->slp_server, nulls,
545 sizeof(init->slp_server)))
546 rc = S_IRUGO;
547 break;
548 case ISCSI_BOOT_INI_PRI_RADIUS_SERVER:
549 if (memcmp(init->pri_radius_server, nulls,
550 sizeof(init->pri_radius_server)))
551 rc = S_IRUGO;
552 break;
553 case ISCSI_BOOT_INI_SEC_RADIUS_SERVER:
554 if (memcmp(init->sec_radius_server, nulls,
555 sizeof(init->sec_radius_server)))
556 rc = S_IRUGO;
557 break;
558 case ISCSI_BOOT_INI_INITIATOR_NAME:
559 if (init->initiator_name_len)
560 rc = S_IRUGO;
561 break;
562 default:
563 break;
564 }
565
566 return rc;
567}
568
569static void ibft_kobj_release(void *data)
570{
571 kfree(data);
572}
573
574/*
575 * Helper function for ibft_register_kobjects.
576 */
577static int __init ibft_create_kobject(struct acpi_table_ibft *header,
578 struct ibft_hdr *hdr)
579{
580 struct iscsi_boot_kobj *boot_kobj = NULL;
581 struct ibft_kobject *ibft_kobj = NULL;
582 struct ibft_nic *nic = (struct ibft_nic *)hdr;
583 struct pci_dev *pci_dev;
584 int rc = 0;
585
586 ibft_kobj = kzalloc(sizeof(*ibft_kobj), GFP_KERNEL);
587 if (!ibft_kobj)
588 return -ENOMEM;
589
590 ibft_kobj->header = header;
591 ibft_kobj->hdr = hdr;
592
593 switch (hdr->id) {
594 case id_initiator:
595 rc = ibft_verify_hdr("initiator", hdr, id_initiator,
596 sizeof(*ibft_kobj->initiator));
597 if (rc)
598 break;
599
600 boot_kobj = iscsi_boot_create_initiator(boot_kset, hdr->index,
601 ibft_kobj,
602 ibft_attr_show_initiator,
603 ibft_check_initiator_for,
604 ibft_kobj_release);
605 if (!boot_kobj) {
606 rc = -ENOMEM;
607 goto free_ibft_obj;
608 }
609 break;
610 case id_nic:
611 rc = ibft_verify_hdr("ethernet", hdr, id_nic,
612 sizeof(*ibft_kobj->nic));
613 if (rc)
614 break;
615
616 boot_kobj = iscsi_boot_create_ethernet(boot_kset, hdr->index,
617 ibft_kobj,
618 ibft_attr_show_nic,
619 ibft_check_nic_for,
620 ibft_kobj_release);
621 if (!boot_kobj) {
622 rc = -ENOMEM;
623 goto free_ibft_obj;
624 }
625 break;
626 case id_target:
627 rc = ibft_verify_hdr("target", hdr, id_target,
628 sizeof(*ibft_kobj->tgt));
629 if (rc)
630 break;
631
632 boot_kobj = iscsi_boot_create_target(boot_kset, hdr->index,
633 ibft_kobj,
634 ibft_attr_show_target,
635 ibft_check_tgt_for,
636 ibft_kobj_release);
637 if (!boot_kobj) {
638 rc = -ENOMEM;
639 goto free_ibft_obj;
640 }
641 break;
642 case id_reserved:
643 case id_control:
644 case id_extensions:
645 /* Fields which we don't support. Ignore them */
646 rc = 1;
647 break;
648 default:
649 printk(KERN_ERR "iBFT has unknown structure type (%d). " \
650 "Report this bug to %.6s!\n", hdr->id,
651 header->header.oem_id);
652 rc = 1;
653 break;
654 }
655
656 if (rc) {
657 /* Skip adding this kobject, but exit with non-fatal error. */
658 rc = 0;
659 goto free_ibft_obj;
660 }
661
662 if (hdr->id == id_nic) {
663 /*
664 * We don't search for the device in other domains than
665 * zero. This is because on x86 platforms the BIOS
666 * executes only devices which are in domain 0. Furthermore, the
667 * iBFT spec doesn't have a domain id field :-(
668 */
669 pci_dev = pci_get_bus_and_slot((nic->pci_bdf & 0xff00) >> 8,
670 (nic->pci_bdf & 0xff));
671 if (pci_dev) {
672 rc = sysfs_create_link(&boot_kobj->kobj,
673 &pci_dev->dev.kobj, "device");
674 pci_dev_put(pci_dev);
675 }
676 }
677 return 0;
678
679free_ibft_obj:
680 kfree(ibft_kobj);
681 return rc;
682}
683
684/*
685 * Scan the IBFT table structure for the NIC and Target fields. When
686 * found add them on the passed-in list. We do not support the other
687 * fields at this point, so they are skipped.
688 */
689static int __init ibft_register_kobjects(struct acpi_table_ibft *header)
690{
691 struct ibft_control *control = NULL;
692 void *ptr, *end;
693 int rc = 0;
694 u16 offset;
695 u16 eot_offset;
696
697 control = (void *)header + sizeof(*header);
698 end = (void *)control + control->hdr.length;
699 eot_offset = (void *)header + header->header.length - (void *)control;
700 rc = ibft_verify_hdr("control", (struct ibft_hdr *)control, id_control,
701 sizeof(*control));
702
703 /* iBFT table safety checking */
704 rc |= ((control->hdr.index) ? -ENODEV : 0);
705 if (rc) {
706 printk(KERN_ERR "iBFT error: Control header is invalid!\n");
707 return rc;
708 }
709 for (ptr = &control->initiator_off; ptr < end; ptr += sizeof(u16)) {
710 offset = *(u16 *)ptr;
711 if (offset && offset < header->header.length &&
712 offset < eot_offset) {
713 rc = ibft_create_kobject(header,
714 (void *)header + offset);
715 if (rc)
716 break;
717 }
718 }
719
720 return rc;
721}
722
723static void ibft_unregister(void)
724{
725 struct iscsi_boot_kobj *boot_kobj, *tmp_kobj;
726 struct ibft_kobject *ibft_kobj;
727
728 list_for_each_entry_safe(boot_kobj, tmp_kobj,
729 &boot_kset->kobj_list, list) {
730 ibft_kobj = boot_kobj->data;
731 if (ibft_kobj->hdr->id == id_nic)
732 sysfs_remove_link(&boot_kobj->kobj, "device");
733 };
734}
735
736static void ibft_cleanup(void)
737{
738 if (boot_kset) {
739 ibft_unregister();
740 iscsi_boot_destroy_kset(boot_kset);
741 }
742}
743
744static void __exit ibft_exit(void)
745{
746 ibft_cleanup();
747}
748
749/*
750 * ibft_init() - creates sysfs tree entries for the iBFT data.
751 */
752static int __init ibft_init(void)
753{
754 int rc = 0;
755
756 if (ibft_addr) {
757 printk(KERN_INFO "iBFT detected at 0x%llx.\n",
758 (u64)isa_virt_to_bus(ibft_addr));
759
760 rc = ibft_check_device();
761 if (rc)
762 return rc;
763
764 boot_kset = iscsi_boot_create_kset("ibft");
765 if (!boot_kset)
766 return -ENOMEM;
767
768 /* Scan the IBFT for data and register the kobjects. */
769 rc = ibft_register_kobjects(ibft_addr);
770 if (rc)
771 goto out_free;
772 } else
773 printk(KERN_INFO "No iBFT detected.\n");
774
775 return 0;
776
777out_free:
778 ibft_cleanup();
779 return rc;
780}
781
782module_init(ibft_init);
783module_exit(ibft_exit);
1/*
2 * Copyright 2007-2010 Red Hat, Inc.
3 * by Peter Jones <pjones@redhat.com>
4 * Copyright 2008 IBM, Inc.
5 * by Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
6 * Copyright 2008
7 * by Konrad Rzeszutek <ketuzsezr@darnok.org>
8 *
9 * This code exposes the iSCSI Boot Format Table to userland via sysfs.
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License v2.0 as published by
13 * the Free Software Foundation
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * Changelog:
21 *
22 * 06 Jan 2010 - Peter Jones <pjones@redhat.com>
23 * New changelog entries are in the git log from now on. Not here.
24 *
25 * 14 Mar 2008 - Konrad Rzeszutek <ketuzsezr@darnok.org>
26 * Updated comments and copyrights. (v0.4.9)
27 *
28 * 11 Feb 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
29 * Converted to using ibft_addr. (v0.4.8)
30 *
31 * 8 Feb 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
32 * Combined two functions in one: reserve_ibft_region. (v0.4.7)
33 *
34 * 30 Jan 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
35 * Added logic to handle IPv6 addresses. (v0.4.6)
36 *
37 * 25 Jan 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
38 * Added logic to handle badly not-to-spec iBFT. (v0.4.5)
39 *
40 * 4 Jan 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
41 * Added __init to function declarations. (v0.4.4)
42 *
43 * 21 Dec 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
44 * Updated kobject registration, combined unregister functions in one
45 * and code and style cleanup. (v0.4.3)
46 *
47 * 5 Dec 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
48 * Added end-markers to enums and re-organized kobject registration. (v0.4.2)
49 *
50 * 4 Dec 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
51 * Created 'device' sysfs link to the NIC and style cleanup. (v0.4.1)
52 *
53 * 28 Nov 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
54 * Added sysfs-ibft documentation, moved 'find_ibft' function to
55 * in its own file and added text attributes for every struct field. (v0.4)
56 *
57 * 21 Nov 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
58 * Added text attributes emulating OpenFirmware /proc/device-tree naming.
59 * Removed binary /sysfs interface (v0.3)
60 *
61 * 29 Aug 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
62 * Added functionality in setup.c to reserve iBFT region. (v0.2)
63 *
64 * 27 Aug 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
65 * First version exposing iBFT data via a binary /sysfs. (v0.1)
66 *
67 */
68
69
70#include <linux/blkdev.h>
71#include <linux/capability.h>
72#include <linux/ctype.h>
73#include <linux/device.h>
74#include <linux/err.h>
75#include <linux/init.h>
76#include <linux/iscsi_ibft.h>
77#include <linux/limits.h>
78#include <linux/module.h>
79#include <linux/pci.h>
80#include <linux/slab.h>
81#include <linux/stat.h>
82#include <linux/string.h>
83#include <linux/types.h>
84#include <linux/acpi.h>
85#include <linux/iscsi_boot_sysfs.h>
86
87#define IBFT_ISCSI_VERSION "0.5.0"
88#define IBFT_ISCSI_DATE "2010-Feb-25"
89
90MODULE_AUTHOR("Peter Jones <pjones@redhat.com> and "
91 "Konrad Rzeszutek <ketuzsezr@darnok.org>");
92MODULE_DESCRIPTION("sysfs interface to BIOS iBFT information");
93MODULE_LICENSE("GPL");
94MODULE_VERSION(IBFT_ISCSI_VERSION);
95
96struct ibft_hdr {
97 u8 id;
98 u8 version;
99 u16 length;
100 u8 index;
101 u8 flags;
102} __attribute__((__packed__));
103
104struct ibft_control {
105 struct ibft_hdr hdr;
106 u16 extensions;
107 u16 initiator_off;
108 u16 nic0_off;
109 u16 tgt0_off;
110 u16 nic1_off;
111 u16 tgt1_off;
112} __attribute__((__packed__));
113
114struct ibft_initiator {
115 struct ibft_hdr hdr;
116 char isns_server[16];
117 char slp_server[16];
118 char pri_radius_server[16];
119 char sec_radius_server[16];
120 u16 initiator_name_len;
121 u16 initiator_name_off;
122} __attribute__((__packed__));
123
124struct ibft_nic {
125 struct ibft_hdr hdr;
126 char ip_addr[16];
127 u8 subnet_mask_prefix;
128 u8 origin;
129 char gateway[16];
130 char primary_dns[16];
131 char secondary_dns[16];
132 char dhcp[16];
133 u16 vlan;
134 char mac[6];
135 u16 pci_bdf;
136 u16 hostname_len;
137 u16 hostname_off;
138} __attribute__((__packed__));
139
140struct ibft_tgt {
141 struct ibft_hdr hdr;
142 char ip_addr[16];
143 u16 port;
144 char lun[8];
145 u8 chap_type;
146 u8 nic_assoc;
147 u16 tgt_name_len;
148 u16 tgt_name_off;
149 u16 chap_name_len;
150 u16 chap_name_off;
151 u16 chap_secret_len;
152 u16 chap_secret_off;
153 u16 rev_chap_name_len;
154 u16 rev_chap_name_off;
155 u16 rev_chap_secret_len;
156 u16 rev_chap_secret_off;
157} __attribute__((__packed__));
158
159/*
160 * The kobject different types and its names.
161 *
162*/
163enum ibft_id {
164 id_reserved = 0, /* We don't support. */
165 id_control = 1, /* Should show up only once and is not exported. */
166 id_initiator = 2,
167 id_nic = 3,
168 id_target = 4,
169 id_extensions = 5, /* We don't support. */
170 id_end_marker,
171};
172
173/*
174 * The kobject and attribute structures.
175 */
176
177struct ibft_kobject {
178 struct acpi_table_ibft *header;
179 union {
180 struct ibft_initiator *initiator;
181 struct ibft_nic *nic;
182 struct ibft_tgt *tgt;
183 struct ibft_hdr *hdr;
184 };
185};
186
187static struct iscsi_boot_kset *boot_kset;
188
189/* fully null address */
190static const char nulls[16];
191
192/* IPv4-mapped IPv6 ::ffff:0.0.0.0 */
193static const char mapped_nulls[16] = { 0x00, 0x00, 0x00, 0x00,
194 0x00, 0x00, 0x00, 0x00,
195 0x00, 0x00, 0xff, 0xff,
196 0x00, 0x00, 0x00, 0x00 };
197
198static int address_not_null(u8 *ip)
199{
200 return (memcmp(ip, nulls, 16) && memcmp(ip, mapped_nulls, 16));
201}
202
203/*
204 * Helper functions to parse data properly.
205 */
206static ssize_t sprintf_ipaddr(char *buf, u8 *ip)
207{
208 char *str = buf;
209
210 if (ip[0] == 0 && ip[1] == 0 && ip[2] == 0 && ip[3] == 0 &&
211 ip[4] == 0 && ip[5] == 0 && ip[6] == 0 && ip[7] == 0 &&
212 ip[8] == 0 && ip[9] == 0 && ip[10] == 0xff && ip[11] == 0xff) {
213 /*
214 * IPV4
215 */
216 str += sprintf(buf, "%pI4", ip + 12);
217 } else {
218 /*
219 * IPv6
220 */
221 str += sprintf(str, "%pI6", ip);
222 }
223 str += sprintf(str, "\n");
224 return str - buf;
225}
226
227static ssize_t sprintf_string(char *str, int len, char *buf)
228{
229 return sprintf(str, "%.*s\n", len, buf);
230}
231
232/*
233 * Helper function to verify the IBFT header.
234 */
235static int ibft_verify_hdr(char *t, struct ibft_hdr *hdr, int id, int length)
236{
237 if (hdr->id != id) {
238 printk(KERN_ERR "iBFT error: We expected the %s " \
239 "field header.id to have %d but " \
240 "found %d instead!\n", t, id, hdr->id);
241 return -ENODEV;
242 }
243 if (hdr->length != length) {
244 printk(KERN_ERR "iBFT error: We expected the %s " \
245 "field header.length to have %d but " \
246 "found %d instead!\n", t, length, hdr->length);
247 return -ENODEV;
248 }
249
250 return 0;
251}
252
253/*
254 * Routines for parsing the iBFT data to be human readable.
255 */
256static ssize_t ibft_attr_show_initiator(void *data, int type, char *buf)
257{
258 struct ibft_kobject *entry = data;
259 struct ibft_initiator *initiator = entry->initiator;
260 void *ibft_loc = entry->header;
261 char *str = buf;
262
263 if (!initiator)
264 return 0;
265
266 switch (type) {
267 case ISCSI_BOOT_INI_INDEX:
268 str += sprintf(str, "%d\n", initiator->hdr.index);
269 break;
270 case ISCSI_BOOT_INI_FLAGS:
271 str += sprintf(str, "%d\n", initiator->hdr.flags);
272 break;
273 case ISCSI_BOOT_INI_ISNS_SERVER:
274 str += sprintf_ipaddr(str, initiator->isns_server);
275 break;
276 case ISCSI_BOOT_INI_SLP_SERVER:
277 str += sprintf_ipaddr(str, initiator->slp_server);
278 break;
279 case ISCSI_BOOT_INI_PRI_RADIUS_SERVER:
280 str += sprintf_ipaddr(str, initiator->pri_radius_server);
281 break;
282 case ISCSI_BOOT_INI_SEC_RADIUS_SERVER:
283 str += sprintf_ipaddr(str, initiator->sec_radius_server);
284 break;
285 case ISCSI_BOOT_INI_INITIATOR_NAME:
286 str += sprintf_string(str, initiator->initiator_name_len,
287 (char *)ibft_loc +
288 initiator->initiator_name_off);
289 break;
290 default:
291 break;
292 }
293
294 return str - buf;
295}
296
297static ssize_t ibft_attr_show_nic(void *data, int type, char *buf)
298{
299 struct ibft_kobject *entry = data;
300 struct ibft_nic *nic = entry->nic;
301 void *ibft_loc = entry->header;
302 char *str = buf;
303 __be32 val;
304
305 if (!nic)
306 return 0;
307
308 switch (type) {
309 case ISCSI_BOOT_ETH_INDEX:
310 str += sprintf(str, "%d\n", nic->hdr.index);
311 break;
312 case ISCSI_BOOT_ETH_FLAGS:
313 str += sprintf(str, "%d\n", nic->hdr.flags);
314 break;
315 case ISCSI_BOOT_ETH_IP_ADDR:
316 str += sprintf_ipaddr(str, nic->ip_addr);
317 break;
318 case ISCSI_BOOT_ETH_SUBNET_MASK:
319 val = cpu_to_be32(~((1 << (32-nic->subnet_mask_prefix))-1));
320 str += sprintf(str, "%pI4", &val);
321 break;
322 case ISCSI_BOOT_ETH_PREFIX_LEN:
323 str += sprintf(str, "%d\n", nic->subnet_mask_prefix);
324 break;
325 case ISCSI_BOOT_ETH_ORIGIN:
326 str += sprintf(str, "%d\n", nic->origin);
327 break;
328 case ISCSI_BOOT_ETH_GATEWAY:
329 str += sprintf_ipaddr(str, nic->gateway);
330 break;
331 case ISCSI_BOOT_ETH_PRIMARY_DNS:
332 str += sprintf_ipaddr(str, nic->primary_dns);
333 break;
334 case ISCSI_BOOT_ETH_SECONDARY_DNS:
335 str += sprintf_ipaddr(str, nic->secondary_dns);
336 break;
337 case ISCSI_BOOT_ETH_DHCP:
338 str += sprintf_ipaddr(str, nic->dhcp);
339 break;
340 case ISCSI_BOOT_ETH_VLAN:
341 str += sprintf(str, "%d\n", nic->vlan);
342 break;
343 case ISCSI_BOOT_ETH_MAC:
344 str += sprintf(str, "%pM\n", nic->mac);
345 break;
346 case ISCSI_BOOT_ETH_HOSTNAME:
347 str += sprintf_string(str, nic->hostname_len,
348 (char *)ibft_loc + nic->hostname_off);
349 break;
350 default:
351 break;
352 }
353
354 return str - buf;
355};
356
357static ssize_t ibft_attr_show_target(void *data, int type, char *buf)
358{
359 struct ibft_kobject *entry = data;
360 struct ibft_tgt *tgt = entry->tgt;
361 void *ibft_loc = entry->header;
362 char *str = buf;
363 int i;
364
365 if (!tgt)
366 return 0;
367
368 switch (type) {
369 case ISCSI_BOOT_TGT_INDEX:
370 str += sprintf(str, "%d\n", tgt->hdr.index);
371 break;
372 case ISCSI_BOOT_TGT_FLAGS:
373 str += sprintf(str, "%d\n", tgt->hdr.flags);
374 break;
375 case ISCSI_BOOT_TGT_IP_ADDR:
376 str += sprintf_ipaddr(str, tgt->ip_addr);
377 break;
378 case ISCSI_BOOT_TGT_PORT:
379 str += sprintf(str, "%d\n", tgt->port);
380 break;
381 case ISCSI_BOOT_TGT_LUN:
382 for (i = 0; i < 8; i++)
383 str += sprintf(str, "%x", (u8)tgt->lun[i]);
384 str += sprintf(str, "\n");
385 break;
386 case ISCSI_BOOT_TGT_NIC_ASSOC:
387 str += sprintf(str, "%d\n", tgt->nic_assoc);
388 break;
389 case ISCSI_BOOT_TGT_CHAP_TYPE:
390 str += sprintf(str, "%d\n", tgt->chap_type);
391 break;
392 case ISCSI_BOOT_TGT_NAME:
393 str += sprintf_string(str, tgt->tgt_name_len,
394 (char *)ibft_loc + tgt->tgt_name_off);
395 break;
396 case ISCSI_BOOT_TGT_CHAP_NAME:
397 str += sprintf_string(str, tgt->chap_name_len,
398 (char *)ibft_loc + tgt->chap_name_off);
399 break;
400 case ISCSI_BOOT_TGT_CHAP_SECRET:
401 str += sprintf_string(str, tgt->chap_secret_len,
402 (char *)ibft_loc + tgt->chap_secret_off);
403 break;
404 case ISCSI_BOOT_TGT_REV_CHAP_NAME:
405 str += sprintf_string(str, tgt->rev_chap_name_len,
406 (char *)ibft_loc +
407 tgt->rev_chap_name_off);
408 break;
409 case ISCSI_BOOT_TGT_REV_CHAP_SECRET:
410 str += sprintf_string(str, tgt->rev_chap_secret_len,
411 (char *)ibft_loc +
412 tgt->rev_chap_secret_off);
413 break;
414 default:
415 break;
416 }
417
418 return str - buf;
419}
420
421static ssize_t ibft_attr_show_acpitbl(void *data, int type, char *buf)
422{
423 struct ibft_kobject *entry = data;
424 char *str = buf;
425
426 switch (type) {
427 case ISCSI_BOOT_ACPITBL_SIGNATURE:
428 str += sprintf_string(str, ACPI_NAME_SIZE,
429 entry->header->header.signature);
430 break;
431 case ISCSI_BOOT_ACPITBL_OEM_ID:
432 str += sprintf_string(str, ACPI_OEM_ID_SIZE,
433 entry->header->header.oem_id);
434 break;
435 case ISCSI_BOOT_ACPITBL_OEM_TABLE_ID:
436 str += sprintf_string(str, ACPI_OEM_TABLE_ID_SIZE,
437 entry->header->header.oem_table_id);
438 break;
439 default:
440 break;
441 }
442
443 return str - buf;
444}
445
446static int __init ibft_check_device(void)
447{
448 int len;
449 u8 *pos;
450 u8 csum = 0;
451
452 len = ibft_addr->header.length;
453
454 /* Sanity checking of iBFT. */
455 if (ibft_addr->header.revision != 1) {
456 printk(KERN_ERR "iBFT module supports only revision 1, " \
457 "while this is %d.\n",
458 ibft_addr->header.revision);
459 return -ENOENT;
460 }
461 for (pos = (u8 *)ibft_addr; pos < (u8 *)ibft_addr + len; pos++)
462 csum += *pos;
463
464 if (csum) {
465 printk(KERN_ERR "iBFT has incorrect checksum (0x%x)!\n", csum);
466 return -ENOENT;
467 }
468
469 return 0;
470}
471
472/*
473 * Helper routiners to check to determine if the entry is valid
474 * in the proper iBFT structure.
475 */
476static umode_t ibft_check_nic_for(void *data, int type)
477{
478 struct ibft_kobject *entry = data;
479 struct ibft_nic *nic = entry->nic;
480 umode_t rc = 0;
481
482 switch (type) {
483 case ISCSI_BOOT_ETH_INDEX:
484 case ISCSI_BOOT_ETH_FLAGS:
485 rc = S_IRUGO;
486 break;
487 case ISCSI_BOOT_ETH_IP_ADDR:
488 if (address_not_null(nic->ip_addr))
489 rc = S_IRUGO;
490 break;
491 case ISCSI_BOOT_ETH_PREFIX_LEN:
492 case ISCSI_BOOT_ETH_SUBNET_MASK:
493 if (nic->subnet_mask_prefix)
494 rc = S_IRUGO;
495 break;
496 case ISCSI_BOOT_ETH_ORIGIN:
497 rc = S_IRUGO;
498 break;
499 case ISCSI_BOOT_ETH_GATEWAY:
500 if (address_not_null(nic->gateway))
501 rc = S_IRUGO;
502 break;
503 case ISCSI_BOOT_ETH_PRIMARY_DNS:
504 if (address_not_null(nic->primary_dns))
505 rc = S_IRUGO;
506 break;
507 case ISCSI_BOOT_ETH_SECONDARY_DNS:
508 if (address_not_null(nic->secondary_dns))
509 rc = S_IRUGO;
510 break;
511 case ISCSI_BOOT_ETH_DHCP:
512 if (address_not_null(nic->dhcp))
513 rc = S_IRUGO;
514 break;
515 case ISCSI_BOOT_ETH_VLAN:
516 case ISCSI_BOOT_ETH_MAC:
517 rc = S_IRUGO;
518 break;
519 case ISCSI_BOOT_ETH_HOSTNAME:
520 if (nic->hostname_off)
521 rc = S_IRUGO;
522 break;
523 default:
524 break;
525 }
526
527 return rc;
528}
529
530static umode_t __init ibft_check_tgt_for(void *data, int type)
531{
532 struct ibft_kobject *entry = data;
533 struct ibft_tgt *tgt = entry->tgt;
534 umode_t rc = 0;
535
536 switch (type) {
537 case ISCSI_BOOT_TGT_INDEX:
538 case ISCSI_BOOT_TGT_FLAGS:
539 case ISCSI_BOOT_TGT_IP_ADDR:
540 case ISCSI_BOOT_TGT_PORT:
541 case ISCSI_BOOT_TGT_LUN:
542 case ISCSI_BOOT_TGT_NIC_ASSOC:
543 case ISCSI_BOOT_TGT_CHAP_TYPE:
544 rc = S_IRUGO;
545 case ISCSI_BOOT_TGT_NAME:
546 if (tgt->tgt_name_len)
547 rc = S_IRUGO;
548 break;
549 case ISCSI_BOOT_TGT_CHAP_NAME:
550 case ISCSI_BOOT_TGT_CHAP_SECRET:
551 if (tgt->chap_name_len)
552 rc = S_IRUGO;
553 break;
554 case ISCSI_BOOT_TGT_REV_CHAP_NAME:
555 case ISCSI_BOOT_TGT_REV_CHAP_SECRET:
556 if (tgt->rev_chap_name_len)
557 rc = S_IRUGO;
558 break;
559 default:
560 break;
561 }
562
563 return rc;
564}
565
566static umode_t __init ibft_check_initiator_for(void *data, int type)
567{
568 struct ibft_kobject *entry = data;
569 struct ibft_initiator *init = entry->initiator;
570 umode_t rc = 0;
571
572 switch (type) {
573 case ISCSI_BOOT_INI_INDEX:
574 case ISCSI_BOOT_INI_FLAGS:
575 rc = S_IRUGO;
576 break;
577 case ISCSI_BOOT_INI_ISNS_SERVER:
578 if (address_not_null(init->isns_server))
579 rc = S_IRUGO;
580 break;
581 case ISCSI_BOOT_INI_SLP_SERVER:
582 if (address_not_null(init->slp_server))
583 rc = S_IRUGO;
584 break;
585 case ISCSI_BOOT_INI_PRI_RADIUS_SERVER:
586 if (address_not_null(init->pri_radius_server))
587 rc = S_IRUGO;
588 break;
589 case ISCSI_BOOT_INI_SEC_RADIUS_SERVER:
590 if (address_not_null(init->sec_radius_server))
591 rc = S_IRUGO;
592 break;
593 case ISCSI_BOOT_INI_INITIATOR_NAME:
594 if (init->initiator_name_len)
595 rc = S_IRUGO;
596 break;
597 default:
598 break;
599 }
600
601 return rc;
602}
603
604static umode_t __init ibft_check_acpitbl_for(void *data, int type)
605{
606
607 umode_t rc = 0;
608
609 switch (type) {
610 case ISCSI_BOOT_ACPITBL_SIGNATURE:
611 case ISCSI_BOOT_ACPITBL_OEM_ID:
612 case ISCSI_BOOT_ACPITBL_OEM_TABLE_ID:
613 rc = S_IRUGO;
614 break;
615 default:
616 break;
617 }
618
619 return rc;
620}
621
622static void ibft_kobj_release(void *data)
623{
624 kfree(data);
625}
626
627/*
628 * Helper function for ibft_register_kobjects.
629 */
630static int __init ibft_create_kobject(struct acpi_table_ibft *header,
631 struct ibft_hdr *hdr)
632{
633 struct iscsi_boot_kobj *boot_kobj = NULL;
634 struct ibft_kobject *ibft_kobj = NULL;
635 struct ibft_nic *nic = (struct ibft_nic *)hdr;
636 struct pci_dev *pci_dev;
637 int rc = 0;
638
639 ibft_kobj = kzalloc(sizeof(*ibft_kobj), GFP_KERNEL);
640 if (!ibft_kobj)
641 return -ENOMEM;
642
643 ibft_kobj->header = header;
644 ibft_kobj->hdr = hdr;
645
646 switch (hdr->id) {
647 case id_initiator:
648 rc = ibft_verify_hdr("initiator", hdr, id_initiator,
649 sizeof(*ibft_kobj->initiator));
650 if (rc)
651 break;
652
653 boot_kobj = iscsi_boot_create_initiator(boot_kset, hdr->index,
654 ibft_kobj,
655 ibft_attr_show_initiator,
656 ibft_check_initiator_for,
657 ibft_kobj_release);
658 if (!boot_kobj) {
659 rc = -ENOMEM;
660 goto free_ibft_obj;
661 }
662 break;
663 case id_nic:
664 rc = ibft_verify_hdr("ethernet", hdr, id_nic,
665 sizeof(*ibft_kobj->nic));
666 if (rc)
667 break;
668
669 boot_kobj = iscsi_boot_create_ethernet(boot_kset, hdr->index,
670 ibft_kobj,
671 ibft_attr_show_nic,
672 ibft_check_nic_for,
673 ibft_kobj_release);
674 if (!boot_kobj) {
675 rc = -ENOMEM;
676 goto free_ibft_obj;
677 }
678 break;
679 case id_target:
680 rc = ibft_verify_hdr("target", hdr, id_target,
681 sizeof(*ibft_kobj->tgt));
682 if (rc)
683 break;
684
685 boot_kobj = iscsi_boot_create_target(boot_kset, hdr->index,
686 ibft_kobj,
687 ibft_attr_show_target,
688 ibft_check_tgt_for,
689 ibft_kobj_release);
690 if (!boot_kobj) {
691 rc = -ENOMEM;
692 goto free_ibft_obj;
693 }
694 break;
695 case id_reserved:
696 case id_control:
697 case id_extensions:
698 /* Fields which we don't support. Ignore them */
699 rc = 1;
700 break;
701 default:
702 printk(KERN_ERR "iBFT has unknown structure type (%d). " \
703 "Report this bug to %.6s!\n", hdr->id,
704 header->header.oem_id);
705 rc = 1;
706 break;
707 }
708
709 if (rc) {
710 /* Skip adding this kobject, but exit with non-fatal error. */
711 rc = 0;
712 goto free_ibft_obj;
713 }
714
715 if (hdr->id == id_nic) {
716 /*
717 * We don't search for the device in other domains than
718 * zero. This is because on x86 platforms the BIOS
719 * executes only devices which are in domain 0. Furthermore, the
720 * iBFT spec doesn't have a domain id field :-(
721 */
722 pci_dev = pci_get_domain_bus_and_slot(0,
723 (nic->pci_bdf & 0xff00) >> 8,
724 (nic->pci_bdf & 0xff));
725 if (pci_dev) {
726 rc = sysfs_create_link(&boot_kobj->kobj,
727 &pci_dev->dev.kobj, "device");
728 pci_dev_put(pci_dev);
729 }
730 }
731 return 0;
732
733free_ibft_obj:
734 kfree(ibft_kobj);
735 return rc;
736}
737
738/*
739 * Scan the IBFT table structure for the NIC and Target fields. When
740 * found add them on the passed-in list. We do not support the other
741 * fields at this point, so they are skipped.
742 */
743static int __init ibft_register_kobjects(struct acpi_table_ibft *header)
744{
745 struct ibft_control *control = NULL;
746 struct iscsi_boot_kobj *boot_kobj;
747 struct ibft_kobject *ibft_kobj;
748 void *ptr, *end;
749 int rc = 0;
750 u16 offset;
751 u16 eot_offset;
752
753 control = (void *)header + sizeof(*header);
754 end = (void *)control + control->hdr.length;
755 eot_offset = (void *)header + header->header.length - (void *)control;
756 rc = ibft_verify_hdr("control", (struct ibft_hdr *)control, id_control,
757 sizeof(*control));
758
759 /* iBFT table safety checking */
760 rc |= ((control->hdr.index) ? -ENODEV : 0);
761 if (rc) {
762 printk(KERN_ERR "iBFT error: Control header is invalid!\n");
763 return rc;
764 }
765 for (ptr = &control->initiator_off; ptr < end; ptr += sizeof(u16)) {
766 offset = *(u16 *)ptr;
767 if (offset && offset < header->header.length &&
768 offset < eot_offset) {
769 rc = ibft_create_kobject(header,
770 (void *)header + offset);
771 if (rc)
772 break;
773 }
774 }
775 if (rc)
776 return rc;
777
778 ibft_kobj = kzalloc(sizeof(*ibft_kobj), GFP_KERNEL);
779 if (!ibft_kobj)
780 return -ENOMEM;
781
782 ibft_kobj->header = header;
783 ibft_kobj->hdr = NULL; /*for ibft_unregister*/
784
785 boot_kobj = iscsi_boot_create_acpitbl(boot_kset, 0,
786 ibft_kobj,
787 ibft_attr_show_acpitbl,
788 ibft_check_acpitbl_for,
789 ibft_kobj_release);
790 if (!boot_kobj) {
791 kfree(ibft_kobj);
792 rc = -ENOMEM;
793 }
794
795 return rc;
796}
797
798static void ibft_unregister(void)
799{
800 struct iscsi_boot_kobj *boot_kobj, *tmp_kobj;
801 struct ibft_kobject *ibft_kobj;
802
803 list_for_each_entry_safe(boot_kobj, tmp_kobj,
804 &boot_kset->kobj_list, list) {
805 ibft_kobj = boot_kobj->data;
806 if (ibft_kobj->hdr && ibft_kobj->hdr->id == id_nic)
807 sysfs_remove_link(&boot_kobj->kobj, "device");
808 };
809}
810
811static void ibft_cleanup(void)
812{
813 if (boot_kset) {
814 ibft_unregister();
815 iscsi_boot_destroy_kset(boot_kset);
816 }
817}
818
819static void __exit ibft_exit(void)
820{
821 ibft_cleanup();
822}
823
824#ifdef CONFIG_ACPI
825static const struct {
826 char *sign;
827} ibft_signs[] = {
828 /*
829 * One spec says "IBFT", the other says "iBFT". We have to check
830 * for both.
831 */
832 { ACPI_SIG_IBFT },
833 { "iBFT" },
834 { "BIFT" }, /* Broadcom iSCSI Offload */
835};
836
837static void __init acpi_find_ibft_region(void)
838{
839 int i;
840 struct acpi_table_header *table = NULL;
841
842 if (acpi_disabled)
843 return;
844
845 for (i = 0; i < ARRAY_SIZE(ibft_signs) && !ibft_addr; i++) {
846 acpi_get_table(ibft_signs[i].sign, 0, &table);
847 ibft_addr = (struct acpi_table_ibft *)table;
848 }
849}
850#else
851static void __init acpi_find_ibft_region(void)
852{
853}
854#endif
855
856/*
857 * ibft_init() - creates sysfs tree entries for the iBFT data.
858 */
859static int __init ibft_init(void)
860{
861 int rc = 0;
862
863 /*
864 As on UEFI systems the setup_arch()/find_ibft_region()
865 is called before ACPI tables are parsed and it only does
866 legacy finding.
867 */
868 if (!ibft_addr)
869 acpi_find_ibft_region();
870
871 if (ibft_addr) {
872 pr_info("iBFT detected.\n");
873
874 rc = ibft_check_device();
875 if (rc)
876 return rc;
877
878 boot_kset = iscsi_boot_create_kset("ibft");
879 if (!boot_kset)
880 return -ENOMEM;
881
882 /* Scan the IBFT for data and register the kobjects. */
883 rc = ibft_register_kobjects(ibft_addr);
884 if (rc)
885 goto out_free;
886 } else
887 printk(KERN_INFO "No iBFT detected.\n");
888
889 return 0;
890
891out_free:
892 ibft_cleanup();
893 return rc;
894}
895
896module_init(ibft_init);
897module_exit(ibft_exit);