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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/drivers/net/netconsole.c
3 *
4 * Copyright (C) 2001 Ingo Molnar <mingo@redhat.com>
5 *
6 * This file contains the implementation of an IRQ-safe, crash-safe
7 * kernel console implementation that outputs kernel messages to the
8 * network.
9 *
10 * Modification history:
11 *
12 * 2001-09-17 started by Ingo Molnar.
13 * 2003-08-11 2.6 port by Matt Mackall
14 * simplified options
15 * generic card hooks
16 * works non-modular
17 * 2003-09-07 rewritten with netpoll api
18 */
19
20/****************************************************************
21 * This program is free software; you can redistribute it and/or modify
22 * it under the terms of the GNU General Public License as published by
23 * the Free Software Foundation; either version 2, or (at your option)
24 * any later version.
25 *
26 * This program is distributed in the hope that it will be useful,
27 * but WITHOUT ANY WARRANTY; without even the implied warranty of
28 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
29 * GNU General Public License for more details.
30 *
31 * You should have received a copy of the GNU General Public License
32 * along with this program; if not, write to the Free Software
33 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
34 *
35 ****************************************************************/
36
37#include <linux/mm.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038#include <linux/init.h>
39#include <linux/module.h>
40#include <linux/console.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#include <linux/moduleparam.h>
42#include <linux/string.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070043#include <linux/netpoll.h>
Satyam Sharma0bcc1812007-08-10 15:35:05 -070044#include <linux/inet.h>
45#include <linux/configfs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
47MODULE_AUTHOR("Maintainer: Matt Mackall <mpm@selenic.com>");
48MODULE_DESCRIPTION("Console driver for network interfaces");
49MODULE_LICENSE("GPL");
50
Satyam Sharmad39badf2007-08-10 15:27:24 -070051#define MAX_PARAM_LENGTH 256
52#define MAX_PRINT_CHUNK 1000
53
54static char config[MAX_PARAM_LENGTH];
55module_param_string(netconsole, config, MAX_PARAM_LENGTH, 0);
Niels de Vos61a2d072008-07-31 00:07:23 -070056MODULE_PARM_DESC(netconsole, " netconsole=[src-port]@[src-ip]/[dev],[tgt-port]@<tgt-ip>/[tgt-macaddr]");
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
Satyam Sharmad2b60882007-08-10 15:29:47 -070058#ifndef MODULE
59static int __init option_setup(char *opt)
60{
61 strlcpy(config, opt, MAX_PARAM_LENGTH);
62 return 1;
63}
64__setup("netconsole=", option_setup);
65#endif /* MODULE */
66
Satyam Sharmab5427c22007-08-10 15:33:40 -070067/* Linked list of all configured targets */
68static LIST_HEAD(target_list);
69
70/* This needs to be a spinlock because write_msg() cannot sleep */
71static DEFINE_SPINLOCK(target_list_lock);
72
Satyam Sharmadf180e32007-08-10 15:32:14 -070073/**
74 * struct netconsole_target - Represents a configured netconsole target.
Satyam Sharmab5427c22007-08-10 15:33:40 -070075 * @list: Links this target into the target_list.
Satyam Sharma0bcc1812007-08-10 15:35:05 -070076 * @item: Links us into the configfs subsystem hierarchy.
77 * @enabled: On / off knob to enable / disable target.
78 * Visible from userspace (read-write).
79 * We maintain a strict 1:1 correspondence between this and
80 * whether the corresponding netpoll is active or inactive.
81 * Also, other parameters of a target may be modified at
82 * runtime only when it is disabled (enabled == 0).
Satyam Sharmadf180e32007-08-10 15:32:14 -070083 * @np: The netpoll structure for this target.
Satyam Sharma0bcc1812007-08-10 15:35:05 -070084 * Contains the other userspace visible parameters:
85 * dev_name (read-write)
86 * local_port (read-write)
87 * remote_port (read-write)
88 * local_ip (read-write)
89 * remote_ip (read-write)
90 * local_mac (read-only)
91 * remote_mac (read-write)
Satyam Sharmadf180e32007-08-10 15:32:14 -070092 */
93struct netconsole_target {
Satyam Sharmab5427c22007-08-10 15:33:40 -070094 struct list_head list;
Satyam Sharma0bcc1812007-08-10 15:35:05 -070095#ifdef CONFIG_NETCONSOLE_DYNAMIC
96 struct config_item item;
97#endif
98 int enabled;
Satyam Sharmadf180e32007-08-10 15:32:14 -070099 struct netpoll np;
100};
101
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700102#ifdef CONFIG_NETCONSOLE_DYNAMIC
103
104static struct configfs_subsystem netconsole_subsys;
105
106static int __init dynamic_netconsole_init(void)
107{
108 config_group_init(&netconsole_subsys.su_group);
109 mutex_init(&netconsole_subsys.su_mutex);
110 return configfs_register_subsystem(&netconsole_subsys);
111}
112
113static void __exit dynamic_netconsole_exit(void)
114{
115 configfs_unregister_subsystem(&netconsole_subsys);
116}
117
118/*
119 * Targets that were created by parsing the boot/module option string
120 * do not exist in the configfs hierarchy (and have NULL names) and will
121 * never go away, so make these a no-op for them.
122 */
123static void netconsole_target_get(struct netconsole_target *nt)
124{
125 if (config_item_name(&nt->item))
126 config_item_get(&nt->item);
127}
128
129static void netconsole_target_put(struct netconsole_target *nt)
130{
131 if (config_item_name(&nt->item))
132 config_item_put(&nt->item);
133}
134
135#else /* !CONFIG_NETCONSOLE_DYNAMIC */
136
137static int __init dynamic_netconsole_init(void)
138{
139 return 0;
140}
141
142static void __exit dynamic_netconsole_exit(void)
143{
144}
145
146/*
147 * No danger of targets going away from under us when dynamic
148 * reconfigurability is off.
149 */
150static void netconsole_target_get(struct netconsole_target *nt)
151{
152}
153
154static void netconsole_target_put(struct netconsole_target *nt)
155{
156}
157
158#endif /* CONFIG_NETCONSOLE_DYNAMIC */
159
160/* Allocate new target (from boot/module param) and setup netpoll for it */
161static struct netconsole_target *alloc_param_target(char *target_config)
Satyam Sharmab5427c22007-08-10 15:33:40 -0700162{
163 int err = -ENOMEM;
164 struct netconsole_target *nt;
165
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700166 /*
167 * Allocate and initialize with defaults.
168 * Note that these targets get their config_item fields zeroed-out.
169 */
Satyam Sharmab5427c22007-08-10 15:33:40 -0700170 nt = kzalloc(sizeof(*nt), GFP_KERNEL);
171 if (!nt) {
172 printk(KERN_ERR "netconsole: failed to allocate memory\n");
173 goto fail;
174 }
175
176 nt->np.name = "netconsole";
177 strlcpy(nt->np.dev_name, "eth0", IFNAMSIZ);
178 nt->np.local_port = 6665;
179 nt->np.remote_port = 6666;
180 memset(nt->np.remote_mac, 0xff, ETH_ALEN);
181
182 /* Parse parameters and setup netpoll */
183 err = netpoll_parse_options(&nt->np, target_config);
184 if (err)
185 goto fail;
186
187 err = netpoll_setup(&nt->np);
188 if (err)
189 goto fail;
190
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700191 nt->enabled = 1;
192
Satyam Sharmab5427c22007-08-10 15:33:40 -0700193 return nt;
194
195fail:
196 kfree(nt);
197 return ERR_PTR(err);
198}
199
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700200/* Cleanup netpoll for given target (from boot/module param) and free it */
201static void free_param_target(struct netconsole_target *nt)
Satyam Sharmab5427c22007-08-10 15:33:40 -0700202{
203 netpoll_cleanup(&nt->np);
204 kfree(nt);
205}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700207#ifdef CONFIG_NETCONSOLE_DYNAMIC
208
209/*
210 * Our subsystem hierarchy is:
211 *
212 * /sys/kernel/config/netconsole/
213 * |
214 * <target>/
215 * | enabled
216 * | dev_name
217 * | local_port
218 * | remote_port
219 * | local_ip
220 * | remote_ip
221 * | local_mac
222 * | remote_mac
223 * |
224 * <target>/...
225 */
226
227struct netconsole_target_attr {
228 struct configfs_attribute attr;
229 ssize_t (*show)(struct netconsole_target *nt,
230 char *buf);
231 ssize_t (*store)(struct netconsole_target *nt,
232 const char *buf,
233 size_t count);
234};
235
236static struct netconsole_target *to_target(struct config_item *item)
237{
238 return item ?
239 container_of(item, struct netconsole_target, item) :
240 NULL;
241}
242
243/*
244 * Wrapper over simple_strtol (base 10) with sanity and range checking.
245 * We return (signed) long only because we may want to return errors.
246 * Do not use this to convert numbers that are allowed to be negative.
247 */
248static long strtol10_check_range(const char *cp, long min, long max)
249{
250 long ret;
251 char *p = (char *) cp;
252
253 WARN_ON(min < 0);
254 WARN_ON(max < min);
255
256 ret = simple_strtol(p, &p, 10);
257
258 if (*p && (*p != '\n')) {
259 printk(KERN_ERR "netconsole: invalid input\n");
260 return -EINVAL;
261 }
262 if ((ret < min) || (ret > max)) {
263 printk(KERN_ERR "netconsole: input %ld must be between "
264 "%ld and %ld\n", ret, min, max);
265 return -EINVAL;
266 }
267
268 return ret;
269}
270
271/*
272 * Attribute operations for netconsole_target.
273 */
274
275static ssize_t show_enabled(struct netconsole_target *nt, char *buf)
276{
277 return snprintf(buf, PAGE_SIZE, "%d\n", nt->enabled);
278}
279
280static ssize_t show_dev_name(struct netconsole_target *nt, char *buf)
281{
282 return snprintf(buf, PAGE_SIZE, "%s\n", nt->np.dev_name);
283}
284
285static ssize_t show_local_port(struct netconsole_target *nt, char *buf)
286{
287 return snprintf(buf, PAGE_SIZE, "%d\n", nt->np.local_port);
288}
289
290static ssize_t show_remote_port(struct netconsole_target *nt, char *buf)
291{
292 return snprintf(buf, PAGE_SIZE, "%d\n", nt->np.remote_port);
293}
294
295static ssize_t show_local_ip(struct netconsole_target *nt, char *buf)
296{
297 return snprintf(buf, PAGE_SIZE, "%d.%d.%d.%d\n",
298 HIPQUAD(nt->np.local_ip));
299}
300
301static ssize_t show_remote_ip(struct netconsole_target *nt, char *buf)
302{
303 return snprintf(buf, PAGE_SIZE, "%d.%d.%d.%d\n",
304 HIPQUAD(nt->np.remote_ip));
305}
306
307static ssize_t show_local_mac(struct netconsole_target *nt, char *buf)
308{
Stephen Hemminger09538642007-11-19 19:23:29 -0800309 struct net_device *dev = nt->np.dev;
Johannes Berge1749612008-10-27 15:59:26 -0700310 static const u8 bcast[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
Stephen Hemminger09538642007-11-19 19:23:29 -0800311
Johannes Berge1749612008-10-27 15:59:26 -0700312 return snprintf(buf, PAGE_SIZE, "%pM\n", dev ? dev->dev_addr : bcast);
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700313}
314
315static ssize_t show_remote_mac(struct netconsole_target *nt, char *buf)
316{
Johannes Berge1749612008-10-27 15:59:26 -0700317 return snprintf(buf, PAGE_SIZE, "%pM\n", nt->np.remote_mac);
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700318}
319
320/*
321 * This one is special -- targets created through the configfs interface
322 * are not enabled (and the corresponding netpoll activated) by default.
323 * The user is expected to set the desired parameters first (which
324 * would enable him to dynamically add new netpoll targets for new
325 * network interfaces as and when they come up).
326 */
327static ssize_t store_enabled(struct netconsole_target *nt,
328 const char *buf,
329 size_t count)
330{
331 int err;
332 long enabled;
333
334 enabled = strtol10_check_range(buf, 0, 1);
335 if (enabled < 0)
336 return enabled;
337
338 if (enabled) { /* 1 */
339
340 /*
341 * Skip netpoll_parse_options() -- all the attributes are
342 * already configured via configfs. Just print them out.
343 */
344 netpoll_print_options(&nt->np);
345
346 err = netpoll_setup(&nt->np);
347 if (err)
348 return err;
349
350 printk(KERN_INFO "netconsole: network logging started\n");
351
352 } else { /* 0 */
353 netpoll_cleanup(&nt->np);
354 }
355
356 nt->enabled = enabled;
357
358 return strnlen(buf, count);
359}
360
361static ssize_t store_dev_name(struct netconsole_target *nt,
362 const char *buf,
363 size_t count)
364{
365 size_t len;
366
367 if (nt->enabled) {
368 printk(KERN_ERR "netconsole: target (%s) is enabled, "
369 "disable to update parameters\n",
370 config_item_name(&nt->item));
371 return -EINVAL;
372 }
373
374 strlcpy(nt->np.dev_name, buf, IFNAMSIZ);
375
376 /* Get rid of possible trailing newline from echo(1) */
377 len = strnlen(nt->np.dev_name, IFNAMSIZ);
378 if (nt->np.dev_name[len - 1] == '\n')
379 nt->np.dev_name[len - 1] = '\0';
380
381 return strnlen(buf, count);
382}
383
384static ssize_t store_local_port(struct netconsole_target *nt,
385 const char *buf,
386 size_t count)
387{
388 long local_port;
389#define __U16_MAX ((__u16) ~0U)
390
391 if (nt->enabled) {
392 printk(KERN_ERR "netconsole: target (%s) is enabled, "
393 "disable to update parameters\n",
394 config_item_name(&nt->item));
395 return -EINVAL;
396 }
397
398 local_port = strtol10_check_range(buf, 0, __U16_MAX);
399 if (local_port < 0)
400 return local_port;
401
402 nt->np.local_port = local_port;
403
404 return strnlen(buf, count);
405}
406
407static ssize_t store_remote_port(struct netconsole_target *nt,
408 const char *buf,
409 size_t count)
410{
411 long remote_port;
412#define __U16_MAX ((__u16) ~0U)
413
414 if (nt->enabled) {
415 printk(KERN_ERR "netconsole: target (%s) is enabled, "
416 "disable to update parameters\n",
417 config_item_name(&nt->item));
418 return -EINVAL;
419 }
420
421 remote_port = strtol10_check_range(buf, 0, __U16_MAX);
422 if (remote_port < 0)
423 return remote_port;
424
425 nt->np.remote_port = remote_port;
426
427 return strnlen(buf, count);
428}
429
430static ssize_t store_local_ip(struct netconsole_target *nt,
431 const char *buf,
432 size_t count)
433{
434 if (nt->enabled) {
435 printk(KERN_ERR "netconsole: target (%s) is enabled, "
436 "disable to update parameters\n",
437 config_item_name(&nt->item));
438 return -EINVAL;
439 }
440
441 nt->np.local_ip = ntohl(in_aton(buf));
442
443 return strnlen(buf, count);
444}
445
446static ssize_t store_remote_ip(struct netconsole_target *nt,
447 const char *buf,
448 size_t count)
449{
450 if (nt->enabled) {
451 printk(KERN_ERR "netconsole: target (%s) is enabled, "
452 "disable to update parameters\n",
453 config_item_name(&nt->item));
454 return -EINVAL;
455 }
456
457 nt->np.remote_ip = ntohl(in_aton(buf));
458
459 return strnlen(buf, count);
460}
461
462static ssize_t store_remote_mac(struct netconsole_target *nt,
463 const char *buf,
464 size_t count)
465{
466 u8 remote_mac[ETH_ALEN];
467 char *p = (char *) buf;
468 int i;
469
470 if (nt->enabled) {
471 printk(KERN_ERR "netconsole: target (%s) is enabled, "
472 "disable to update parameters\n",
473 config_item_name(&nt->item));
474 return -EINVAL;
475 }
476
477 for (i = 0; i < ETH_ALEN - 1; i++) {
478 remote_mac[i] = simple_strtoul(p, &p, 16);
479 if (*p != ':')
480 goto invalid;
481 p++;
482 }
483 remote_mac[ETH_ALEN - 1] = simple_strtoul(p, &p, 16);
484 if (*p && (*p != '\n'))
485 goto invalid;
486
487 memcpy(nt->np.remote_mac, remote_mac, ETH_ALEN);
488
489 return strnlen(buf, count);
490
491invalid:
492 printk(KERN_ERR "netconsole: invalid input\n");
493 return -EINVAL;
494}
495
496/*
497 * Attribute definitions for netconsole_target.
498 */
499
500#define NETCONSOLE_TARGET_ATTR_RO(_name) \
501static struct netconsole_target_attr netconsole_target_##_name = \
502 __CONFIGFS_ATTR(_name, S_IRUGO, show_##_name, NULL)
503
504#define NETCONSOLE_TARGET_ATTR_RW(_name) \
505static struct netconsole_target_attr netconsole_target_##_name = \
506 __CONFIGFS_ATTR(_name, S_IRUGO | S_IWUSR, show_##_name, store_##_name)
507
508NETCONSOLE_TARGET_ATTR_RW(enabled);
509NETCONSOLE_TARGET_ATTR_RW(dev_name);
510NETCONSOLE_TARGET_ATTR_RW(local_port);
511NETCONSOLE_TARGET_ATTR_RW(remote_port);
512NETCONSOLE_TARGET_ATTR_RW(local_ip);
513NETCONSOLE_TARGET_ATTR_RW(remote_ip);
514NETCONSOLE_TARGET_ATTR_RO(local_mac);
515NETCONSOLE_TARGET_ATTR_RW(remote_mac);
516
517static struct configfs_attribute *netconsole_target_attrs[] = {
518 &netconsole_target_enabled.attr,
519 &netconsole_target_dev_name.attr,
520 &netconsole_target_local_port.attr,
521 &netconsole_target_remote_port.attr,
522 &netconsole_target_local_ip.attr,
523 &netconsole_target_remote_ip.attr,
524 &netconsole_target_local_mac.attr,
525 &netconsole_target_remote_mac.attr,
526 NULL,
527};
528
529/*
530 * Item operations and type for netconsole_target.
531 */
532
533static void netconsole_target_release(struct config_item *item)
534{
535 kfree(to_target(item));
536}
537
538static ssize_t netconsole_target_attr_show(struct config_item *item,
539 struct configfs_attribute *attr,
540 char *buf)
541{
542 ssize_t ret = -EINVAL;
543 struct netconsole_target *nt = to_target(item);
544 struct netconsole_target_attr *na =
545 container_of(attr, struct netconsole_target_attr, attr);
546
547 if (na->show)
548 ret = na->show(nt, buf);
549
550 return ret;
551}
552
553static ssize_t netconsole_target_attr_store(struct config_item *item,
554 struct configfs_attribute *attr,
555 const char *buf,
556 size_t count)
557{
558 ssize_t ret = -EINVAL;
559 struct netconsole_target *nt = to_target(item);
560 struct netconsole_target_attr *na =
561 container_of(attr, struct netconsole_target_attr, attr);
562
563 if (na->store)
564 ret = na->store(nt, buf, count);
565
566 return ret;
567}
568
569static struct configfs_item_operations netconsole_target_item_ops = {
570 .release = netconsole_target_release,
571 .show_attribute = netconsole_target_attr_show,
572 .store_attribute = netconsole_target_attr_store,
573};
574
575static struct config_item_type netconsole_target_type = {
576 .ct_attrs = netconsole_target_attrs,
577 .ct_item_ops = &netconsole_target_item_ops,
578 .ct_owner = THIS_MODULE,
579};
580
581/*
582 * Group operations and type for netconsole_subsys.
583 */
584
Joel Beckerf89ab862008-07-17 14:53:48 -0700585static struct config_item *make_netconsole_target(struct config_group *group,
586 const char *name)
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700587{
588 unsigned long flags;
589 struct netconsole_target *nt;
590
591 /*
592 * Allocate and initialize with defaults.
593 * Target is disabled at creation (enabled == 0).
594 */
595 nt = kzalloc(sizeof(*nt), GFP_KERNEL);
596 if (!nt) {
597 printk(KERN_ERR "netconsole: failed to allocate memory\n");
Joel Beckera6795e92008-07-17 15:21:29 -0700598 return ERR_PTR(-ENOMEM);
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700599 }
600
601 nt->np.name = "netconsole";
602 strlcpy(nt->np.dev_name, "eth0", IFNAMSIZ);
603 nt->np.local_port = 6665;
604 nt->np.remote_port = 6666;
605 memset(nt->np.remote_mac, 0xff, ETH_ALEN);
606
607 /* Initialize the config_item member */
608 config_item_init_type_name(&nt->item, name, &netconsole_target_type);
609
610 /* Adding, but it is disabled */
611 spin_lock_irqsave(&target_list_lock, flags);
612 list_add(&nt->list, &target_list);
613 spin_unlock_irqrestore(&target_list_lock, flags);
614
Joel Beckerf89ab862008-07-17 14:53:48 -0700615 return &nt->item;
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700616}
617
618static void drop_netconsole_target(struct config_group *group,
619 struct config_item *item)
620{
621 unsigned long flags;
622 struct netconsole_target *nt = to_target(item);
623
624 spin_lock_irqsave(&target_list_lock, flags);
625 list_del(&nt->list);
626 spin_unlock_irqrestore(&target_list_lock, flags);
627
628 /*
629 * The target may have never been enabled, or was manually disabled
630 * before being removed so netpoll may have already been cleaned up.
631 */
632 if (nt->enabled)
633 netpoll_cleanup(&nt->np);
634
635 config_item_put(&nt->item);
636}
637
638static struct configfs_group_operations netconsole_subsys_group_ops = {
639 .make_item = make_netconsole_target,
640 .drop_item = drop_netconsole_target,
641};
642
643static struct config_item_type netconsole_subsys_type = {
644 .ct_group_ops = &netconsole_subsys_group_ops,
645 .ct_owner = THIS_MODULE,
646};
647
648/* The netconsole configfs subsystem */
649static struct configfs_subsystem netconsole_subsys = {
650 .su_group = {
651 .cg_item = {
652 .ci_namebuf = "netconsole",
653 .ci_type = &netconsole_subsys_type,
654 },
655 },
656};
657
658#endif /* CONFIG_NETCONSOLE_DYNAMIC */
659
Satyam Sharma17951f32007-08-10 15:33:01 -0700660/* Handle network interface device notifications */
661static int netconsole_netdev_event(struct notifier_block *this,
662 unsigned long event,
663 void *ptr)
664{
Satyam Sharmab5427c22007-08-10 15:33:40 -0700665 unsigned long flags;
666 struct netconsole_target *nt;
Satyam Sharma17951f32007-08-10 15:33:01 -0700667 struct net_device *dev = ptr;
Satyam Sharma17951f32007-08-10 15:33:01 -0700668
Stephen Hemminger09538642007-11-19 19:23:29 -0800669 if (!(event == NETDEV_CHANGENAME))
Satyam Sharmab5427c22007-08-10 15:33:40 -0700670 goto done;
Satyam Sharma17951f32007-08-10 15:33:01 -0700671
Satyam Sharmab5427c22007-08-10 15:33:40 -0700672 spin_lock_irqsave(&target_list_lock, flags);
673 list_for_each_entry(nt, &target_list, list) {
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700674 netconsole_target_get(nt);
Satyam Sharmab5427c22007-08-10 15:33:40 -0700675 if (nt->np.dev == dev) {
676 switch (event) {
Satyam Sharmab5427c22007-08-10 15:33:40 -0700677 case NETDEV_CHANGENAME:
678 strlcpy(nt->np.dev_name, dev->name, IFNAMSIZ);
679 break;
680 }
Satyam Sharma17951f32007-08-10 15:33:01 -0700681 }
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700682 netconsole_target_put(nt);
Satyam Sharma17951f32007-08-10 15:33:01 -0700683 }
Satyam Sharmab5427c22007-08-10 15:33:40 -0700684 spin_unlock_irqrestore(&target_list_lock, flags);
Satyam Sharma17951f32007-08-10 15:33:01 -0700685
Satyam Sharmab5427c22007-08-10 15:33:40 -0700686done:
Satyam Sharma17951f32007-08-10 15:33:01 -0700687 return NOTIFY_DONE;
688}
689
690static struct notifier_block netconsole_netdev_notifier = {
691 .notifier_call = netconsole_netdev_event,
692};
693
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694static void write_msg(struct console *con, const char *msg, unsigned int len)
695{
696 int frag, left;
697 unsigned long flags;
Satyam Sharmab5427c22007-08-10 15:33:40 -0700698 struct netconsole_target *nt;
699 const char *tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700
Satyam Sharmab5427c22007-08-10 15:33:40 -0700701 /* Avoid taking lock and disabling interrupts unnecessarily */
702 if (list_empty(&target_list))
703 return;
704
705 spin_lock_irqsave(&target_list_lock, flags);
706 list_for_each_entry(nt, &target_list, list) {
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700707 netconsole_target_get(nt);
708 if (nt->enabled && netif_running(nt->np.dev)) {
Satyam Sharmab5427c22007-08-10 15:33:40 -0700709 /*
710 * We nest this inside the for-each-target loop above
711 * so that we're able to get as much logging out to
712 * at least one target if we die inside here, instead
713 * of unnecessarily keeping all targets in lock-step.
714 */
715 tmp = msg;
716 for (left = len; left;) {
717 frag = min(left, MAX_PRINT_CHUNK);
718 netpoll_send_udp(&nt->np, tmp, frag);
719 tmp += frag;
720 left -= frag;
721 }
Satyam Sharma0cc120be2007-08-10 15:30:31 -0700722 }
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700723 netconsole_target_put(nt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724 }
Satyam Sharmab5427c22007-08-10 15:33:40 -0700725 spin_unlock_irqrestore(&target_list_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726}
727
728static struct console netconsole = {
Satyam Sharmad39badf2007-08-10 15:27:24 -0700729 .name = "netcon",
Michael Ellerman0517dee2008-04-15 00:49:04 -0700730 .flags = CON_ENABLED,
Satyam Sharmad39badf2007-08-10 15:27:24 -0700731 .write = write_msg,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732};
733
Satyam Sharmad39badf2007-08-10 15:27:24 -0700734static int __init init_netconsole(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735{
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700736 int err;
Satyam Sharmab5427c22007-08-10 15:33:40 -0700737 struct netconsole_target *nt, *tmp;
738 unsigned long flags;
739 char *target_config;
740 char *input = config;
Stephen Hemmingerb41848b2006-10-26 15:46:52 -0700741
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700742 if (strnlen(input, MAX_PARAM_LENGTH)) {
743 while ((target_config = strsep(&input, ";"))) {
744 nt = alloc_param_target(target_config);
745 if (IS_ERR(nt)) {
746 err = PTR_ERR(nt);
747 goto fail;
748 }
Michael Ellerman0517dee2008-04-15 00:49:04 -0700749 /* Dump existing printks when we register */
750 netconsole.flags |= CON_PRINTBUFFER;
751
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700752 spin_lock_irqsave(&target_list_lock, flags);
753 list_add(&nt->list, &target_list);
754 spin_unlock_irqrestore(&target_list_lock, flags);
Satyam Sharmab5427c22007-08-10 15:33:40 -0700755 }
Satyam Sharmab5427c22007-08-10 15:33:40 -0700756 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757
Satyam Sharma17951f32007-08-10 15:33:01 -0700758 err = register_netdevice_notifier(&netconsole_netdev_notifier);
759 if (err)
Satyam Sharmab5427c22007-08-10 15:33:40 -0700760 goto fail;
Satyam Sharma17951f32007-08-10 15:33:01 -0700761
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700762 err = dynamic_netconsole_init();
763 if (err)
764 goto undonotifier;
765
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766 register_console(&netconsole);
767 printk(KERN_INFO "netconsole: network logging started\n");
Satyam Sharmad39badf2007-08-10 15:27:24 -0700768
Satyam Sharmad39badf2007-08-10 15:27:24 -0700769 return err;
Satyam Sharmab5427c22007-08-10 15:33:40 -0700770
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700771undonotifier:
772 unregister_netdevice_notifier(&netconsole_netdev_notifier);
773
Satyam Sharmab5427c22007-08-10 15:33:40 -0700774fail:
775 printk(KERN_ERR "netconsole: cleaning up\n");
776
777 /*
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700778 * Remove all targets and destroy them (only targets created
779 * from the boot/module option exist here). Skipping the list
Satyam Sharmab5427c22007-08-10 15:33:40 -0700780 * lock is safe here, and netpoll_cleanup() will sleep.
781 */
782 list_for_each_entry_safe(nt, tmp, &target_list, list) {
783 list_del(&nt->list);
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700784 free_param_target(nt);
Satyam Sharmab5427c22007-08-10 15:33:40 -0700785 }
786
787 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788}
789
Satyam Sharmad39badf2007-08-10 15:27:24 -0700790static void __exit cleanup_netconsole(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791{
Satyam Sharmab5427c22007-08-10 15:33:40 -0700792 struct netconsole_target *nt, *tmp;
Satyam Sharmadf180e32007-08-10 15:32:14 -0700793
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794 unregister_console(&netconsole);
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700795 dynamic_netconsole_exit();
Satyam Sharma17951f32007-08-10 15:33:01 -0700796 unregister_netdevice_notifier(&netconsole_netdev_notifier);
Satyam Sharmab5427c22007-08-10 15:33:40 -0700797
798 /*
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700799 * Targets created via configfs pin references on our module
800 * and would first be rmdir(2)'ed from userspace. We reach
801 * here only when they are already destroyed, and only those
802 * created from the boot/module option are left, so remove and
803 * destroy them. Skipping the list lock is safe here, and
804 * netpoll_cleanup() will sleep.
Satyam Sharmab5427c22007-08-10 15:33:40 -0700805 */
806 list_for_each_entry_safe(nt, tmp, &target_list, list) {
807 list_del(&nt->list);
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700808 free_param_target(nt);
Satyam Sharmab5427c22007-08-10 15:33:40 -0700809 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810}
811
812module_init(init_netconsole);
813module_exit(cleanup_netconsole);