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1da177e4 LT |
1 | /* |
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> | |
1da177e4 LT |
38 | #include <linux/init.h> |
39 | #include <linux/module.h> | |
5a0e3ad6 | 40 | #include <linux/slab.h> |
1da177e4 | 41 | #include <linux/console.h> |
1da177e4 LT |
42 | #include <linux/moduleparam.h> |
43 | #include <linux/string.h> | |
1da177e4 | 44 | #include <linux/netpoll.h> |
0bcc1816 SS |
45 | #include <linux/inet.h> |
46 | #include <linux/configfs.h> | |
1da177e4 LT |
47 | |
48 | MODULE_AUTHOR("Maintainer: Matt Mackall <mpm@selenic.com>"); | |
49 | MODULE_DESCRIPTION("Console driver for network interfaces"); | |
50 | MODULE_LICENSE("GPL"); | |
51 | ||
d39badf0 SS |
52 | #define MAX_PARAM_LENGTH 256 |
53 | #define MAX_PRINT_CHUNK 1000 | |
54 | ||
55 | static char config[MAX_PARAM_LENGTH]; | |
56 | module_param_string(netconsole, config, MAX_PARAM_LENGTH, 0); | |
61a2d07d | 57 | MODULE_PARM_DESC(netconsole, " netconsole=[src-port]@[src-ip]/[dev],[tgt-port]@<tgt-ip>/[tgt-macaddr]"); |
1da177e4 | 58 | |
d2b60881 SS |
59 | #ifndef MODULE |
60 | static int __init option_setup(char *opt) | |
61 | { | |
62 | strlcpy(config, opt, MAX_PARAM_LENGTH); | |
63 | return 1; | |
64 | } | |
65 | __setup("netconsole=", option_setup); | |
66 | #endif /* MODULE */ | |
67 | ||
b5427c27 SS |
68 | /* Linked list of all configured targets */ |
69 | static LIST_HEAD(target_list); | |
70 | ||
71 | /* This needs to be a spinlock because write_msg() cannot sleep */ | |
72 | static DEFINE_SPINLOCK(target_list_lock); | |
73 | ||
df180e36 SS |
74 | /** |
75 | * struct netconsole_target - Represents a configured netconsole target. | |
b5427c27 | 76 | * @list: Links this target into the target_list. |
0bcc1816 SS |
77 | * @item: Links us into the configfs subsystem hierarchy. |
78 | * @enabled: On / off knob to enable / disable target. | |
79 | * Visible from userspace (read-write). | |
80 | * We maintain a strict 1:1 correspondence between this and | |
81 | * whether the corresponding netpoll is active or inactive. | |
82 | * Also, other parameters of a target may be modified at | |
83 | * runtime only when it is disabled (enabled == 0). | |
df180e36 | 84 | * @np: The netpoll structure for this target. |
0bcc1816 SS |
85 | * Contains the other userspace visible parameters: |
86 | * dev_name (read-write) | |
87 | * local_port (read-write) | |
88 | * remote_port (read-write) | |
89 | * local_ip (read-write) | |
90 | * remote_ip (read-write) | |
91 | * local_mac (read-only) | |
92 | * remote_mac (read-write) | |
df180e36 SS |
93 | */ |
94 | struct netconsole_target { | |
b5427c27 | 95 | struct list_head list; |
0bcc1816 SS |
96 | #ifdef CONFIG_NETCONSOLE_DYNAMIC |
97 | struct config_item item; | |
98 | #endif | |
99 | int enabled; | |
df180e36 SS |
100 | struct netpoll np; |
101 | }; | |
102 | ||
0bcc1816 SS |
103 | #ifdef CONFIG_NETCONSOLE_DYNAMIC |
104 | ||
105 | static struct configfs_subsystem netconsole_subsys; | |
106 | ||
107 | static int __init dynamic_netconsole_init(void) | |
108 | { | |
109 | config_group_init(&netconsole_subsys.su_group); | |
110 | mutex_init(&netconsole_subsys.su_mutex); | |
111 | return configfs_register_subsystem(&netconsole_subsys); | |
112 | } | |
113 | ||
114 | static void __exit dynamic_netconsole_exit(void) | |
115 | { | |
116 | configfs_unregister_subsystem(&netconsole_subsys); | |
117 | } | |
118 | ||
119 | /* | |
120 | * Targets that were created by parsing the boot/module option string | |
121 | * do not exist in the configfs hierarchy (and have NULL names) and will | |
122 | * never go away, so make these a no-op for them. | |
123 | */ | |
124 | static void netconsole_target_get(struct netconsole_target *nt) | |
125 | { | |
126 | if (config_item_name(&nt->item)) | |
127 | config_item_get(&nt->item); | |
128 | } | |
129 | ||
130 | static void netconsole_target_put(struct netconsole_target *nt) | |
131 | { | |
132 | if (config_item_name(&nt->item)) | |
133 | config_item_put(&nt->item); | |
134 | } | |
135 | ||
136 | #else /* !CONFIG_NETCONSOLE_DYNAMIC */ | |
137 | ||
138 | static int __init dynamic_netconsole_init(void) | |
139 | { | |
140 | return 0; | |
141 | } | |
142 | ||
143 | static void __exit dynamic_netconsole_exit(void) | |
144 | { | |
145 | } | |
146 | ||
147 | /* | |
148 | * No danger of targets going away from under us when dynamic | |
149 | * reconfigurability is off. | |
150 | */ | |
151 | static void netconsole_target_get(struct netconsole_target *nt) | |
152 | { | |
153 | } | |
154 | ||
155 | static void netconsole_target_put(struct netconsole_target *nt) | |
156 | { | |
157 | } | |
158 | ||
159 | #endif /* CONFIG_NETCONSOLE_DYNAMIC */ | |
160 | ||
161 | /* Allocate new target (from boot/module param) and setup netpoll for it */ | |
162 | static struct netconsole_target *alloc_param_target(char *target_config) | |
b5427c27 SS |
163 | { |
164 | int err = -ENOMEM; | |
165 | struct netconsole_target *nt; | |
166 | ||
0bcc1816 SS |
167 | /* |
168 | * Allocate and initialize with defaults. | |
169 | * Note that these targets get their config_item fields zeroed-out. | |
170 | */ | |
b5427c27 SS |
171 | nt = kzalloc(sizeof(*nt), GFP_KERNEL); |
172 | if (!nt) { | |
173 | printk(KERN_ERR "netconsole: failed to allocate memory\n"); | |
174 | goto fail; | |
175 | } | |
176 | ||
177 | nt->np.name = "netconsole"; | |
178 | strlcpy(nt->np.dev_name, "eth0", IFNAMSIZ); | |
179 | nt->np.local_port = 6665; | |
180 | nt->np.remote_port = 6666; | |
181 | memset(nt->np.remote_mac, 0xff, ETH_ALEN); | |
182 | ||
183 | /* Parse parameters and setup netpoll */ | |
184 | err = netpoll_parse_options(&nt->np, target_config); | |
185 | if (err) | |
186 | goto fail; | |
187 | ||
188 | err = netpoll_setup(&nt->np); | |
189 | if (err) | |
190 | goto fail; | |
191 | ||
0bcc1816 SS |
192 | nt->enabled = 1; |
193 | ||
b5427c27 SS |
194 | return nt; |
195 | ||
196 | fail: | |
197 | kfree(nt); | |
198 | return ERR_PTR(err); | |
199 | } | |
200 | ||
0bcc1816 SS |
201 | /* Cleanup netpoll for given target (from boot/module param) and free it */ |
202 | static void free_param_target(struct netconsole_target *nt) | |
b5427c27 SS |
203 | { |
204 | netpoll_cleanup(&nt->np); | |
205 | kfree(nt); | |
206 | } | |
1da177e4 | 207 | |
0bcc1816 SS |
208 | #ifdef CONFIG_NETCONSOLE_DYNAMIC |
209 | ||
210 | /* | |
211 | * Our subsystem hierarchy is: | |
212 | * | |
213 | * /sys/kernel/config/netconsole/ | |
214 | * | | |
215 | * <target>/ | |
216 | * | enabled | |
217 | * | dev_name | |
218 | * | local_port | |
219 | * | remote_port | |
220 | * | local_ip | |
221 | * | remote_ip | |
222 | * | local_mac | |
223 | * | remote_mac | |
224 | * | | |
225 | * <target>/... | |
226 | */ | |
227 | ||
228 | struct netconsole_target_attr { | |
229 | struct configfs_attribute attr; | |
230 | ssize_t (*show)(struct netconsole_target *nt, | |
231 | char *buf); | |
232 | ssize_t (*store)(struct netconsole_target *nt, | |
233 | const char *buf, | |
234 | size_t count); | |
235 | }; | |
236 | ||
237 | static struct netconsole_target *to_target(struct config_item *item) | |
238 | { | |
239 | return item ? | |
240 | container_of(item, struct netconsole_target, item) : | |
241 | NULL; | |
242 | } | |
243 | ||
244 | /* | |
245 | * Wrapper over simple_strtol (base 10) with sanity and range checking. | |
246 | * We return (signed) long only because we may want to return errors. | |
247 | * Do not use this to convert numbers that are allowed to be negative. | |
248 | */ | |
249 | static long strtol10_check_range(const char *cp, long min, long max) | |
250 | { | |
251 | long ret; | |
252 | char *p = (char *) cp; | |
253 | ||
254 | WARN_ON(min < 0); | |
255 | WARN_ON(max < min); | |
256 | ||
257 | ret = simple_strtol(p, &p, 10); | |
258 | ||
259 | if (*p && (*p != '\n')) { | |
260 | printk(KERN_ERR "netconsole: invalid input\n"); | |
261 | return -EINVAL; | |
262 | } | |
263 | if ((ret < min) || (ret > max)) { | |
264 | printk(KERN_ERR "netconsole: input %ld must be between " | |
265 | "%ld and %ld\n", ret, min, max); | |
266 | return -EINVAL; | |
267 | } | |
268 | ||
269 | return ret; | |
270 | } | |
271 | ||
272 | /* | |
273 | * Attribute operations for netconsole_target. | |
274 | */ | |
275 | ||
276 | static ssize_t show_enabled(struct netconsole_target *nt, char *buf) | |
277 | { | |
278 | return snprintf(buf, PAGE_SIZE, "%d\n", nt->enabled); | |
279 | } | |
280 | ||
281 | static ssize_t show_dev_name(struct netconsole_target *nt, char *buf) | |
282 | { | |
283 | return snprintf(buf, PAGE_SIZE, "%s\n", nt->np.dev_name); | |
284 | } | |
285 | ||
286 | static ssize_t show_local_port(struct netconsole_target *nt, char *buf) | |
287 | { | |
288 | return snprintf(buf, PAGE_SIZE, "%d\n", nt->np.local_port); | |
289 | } | |
290 | ||
291 | static ssize_t show_remote_port(struct netconsole_target *nt, char *buf) | |
292 | { | |
293 | return snprintf(buf, PAGE_SIZE, "%d\n", nt->np.remote_port); | |
294 | } | |
295 | ||
296 | static ssize_t show_local_ip(struct netconsole_target *nt, char *buf) | |
297 | { | |
e7557af5 | 298 | return snprintf(buf, PAGE_SIZE, "%pI4\n", &nt->np.local_ip); |
0bcc1816 SS |
299 | } |
300 | ||
301 | static ssize_t show_remote_ip(struct netconsole_target *nt, char *buf) | |
302 | { | |
e7557af5 | 303 | return snprintf(buf, PAGE_SIZE, "%pI4\n", &nt->np.remote_ip); |
0bcc1816 SS |
304 | } |
305 | ||
306 | static ssize_t show_local_mac(struct netconsole_target *nt, char *buf) | |
307 | { | |
09538641 | 308 | struct net_device *dev = nt->np.dev; |
e174961c | 309 | static const u8 bcast[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; |
09538641 | 310 | |
e174961c | 311 | return snprintf(buf, PAGE_SIZE, "%pM\n", dev ? dev->dev_addr : bcast); |
0bcc1816 SS |
312 | } |
313 | ||
314 | static ssize_t show_remote_mac(struct netconsole_target *nt, char *buf) | |
315 | { | |
e174961c | 316 | return snprintf(buf, PAGE_SIZE, "%pM\n", nt->np.remote_mac); |
0bcc1816 SS |
317 | } |
318 | ||
319 | /* | |
320 | * This one is special -- targets created through the configfs interface | |
321 | * are not enabled (and the corresponding netpoll activated) by default. | |
322 | * The user is expected to set the desired parameters first (which | |
323 | * would enable him to dynamically add new netpoll targets for new | |
324 | * network interfaces as and when they come up). | |
325 | */ | |
326 | static ssize_t store_enabled(struct netconsole_target *nt, | |
327 | const char *buf, | |
328 | size_t count) | |
329 | { | |
330 | int err; | |
331 | long enabled; | |
332 | ||
333 | enabled = strtol10_check_range(buf, 0, 1); | |
334 | if (enabled < 0) | |
335 | return enabled; | |
336 | ||
337 | if (enabled) { /* 1 */ | |
338 | ||
339 | /* | |
340 | * Skip netpoll_parse_options() -- all the attributes are | |
341 | * already configured via configfs. Just print them out. | |
342 | */ | |
343 | netpoll_print_options(&nt->np); | |
344 | ||
345 | err = netpoll_setup(&nt->np); | |
346 | if (err) | |
347 | return err; | |
348 | ||
349 | printk(KERN_INFO "netconsole: network logging started\n"); | |
350 | ||
351 | } else { /* 0 */ | |
352 | netpoll_cleanup(&nt->np); | |
353 | } | |
354 | ||
355 | nt->enabled = enabled; | |
356 | ||
357 | return strnlen(buf, count); | |
358 | } | |
359 | ||
360 | static ssize_t store_dev_name(struct netconsole_target *nt, | |
361 | const char *buf, | |
362 | size_t count) | |
363 | { | |
364 | size_t len; | |
365 | ||
366 | if (nt->enabled) { | |
367 | printk(KERN_ERR "netconsole: target (%s) is enabled, " | |
368 | "disable to update parameters\n", | |
369 | config_item_name(&nt->item)); | |
370 | return -EINVAL; | |
371 | } | |
372 | ||
373 | strlcpy(nt->np.dev_name, buf, IFNAMSIZ); | |
374 | ||
375 | /* Get rid of possible trailing newline from echo(1) */ | |
376 | len = strnlen(nt->np.dev_name, IFNAMSIZ); | |
377 | if (nt->np.dev_name[len - 1] == '\n') | |
378 | nt->np.dev_name[len - 1] = '\0'; | |
379 | ||
380 | return strnlen(buf, count); | |
381 | } | |
382 | ||
383 | static ssize_t store_local_port(struct netconsole_target *nt, | |
384 | const char *buf, | |
385 | size_t count) | |
386 | { | |
387 | long local_port; | |
388 | #define __U16_MAX ((__u16) ~0U) | |
389 | ||
390 | if (nt->enabled) { | |
391 | printk(KERN_ERR "netconsole: target (%s) is enabled, " | |
392 | "disable to update parameters\n", | |
393 | config_item_name(&nt->item)); | |
394 | return -EINVAL; | |
395 | } | |
396 | ||
397 | local_port = strtol10_check_range(buf, 0, __U16_MAX); | |
398 | if (local_port < 0) | |
399 | return local_port; | |
400 | ||
401 | nt->np.local_port = local_port; | |
402 | ||
403 | return strnlen(buf, count); | |
404 | } | |
405 | ||
406 | static ssize_t store_remote_port(struct netconsole_target *nt, | |
407 | const char *buf, | |
408 | size_t count) | |
409 | { | |
410 | long remote_port; | |
411 | #define __U16_MAX ((__u16) ~0U) | |
412 | ||
413 | if (nt->enabled) { | |
414 | printk(KERN_ERR "netconsole: target (%s) is enabled, " | |
415 | "disable to update parameters\n", | |
416 | config_item_name(&nt->item)); | |
417 | return -EINVAL; | |
418 | } | |
419 | ||
420 | remote_port = strtol10_check_range(buf, 0, __U16_MAX); | |
421 | if (remote_port < 0) | |
422 | return remote_port; | |
423 | ||
424 | nt->np.remote_port = remote_port; | |
425 | ||
426 | return strnlen(buf, count); | |
427 | } | |
428 | ||
429 | static ssize_t store_local_ip(struct netconsole_target *nt, | |
430 | const char *buf, | |
431 | size_t count) | |
432 | { | |
433 | if (nt->enabled) { | |
434 | printk(KERN_ERR "netconsole: target (%s) is enabled, " | |
435 | "disable to update parameters\n", | |
436 | config_item_name(&nt->item)); | |
437 | return -EINVAL; | |
438 | } | |
439 | ||
e7557af5 | 440 | nt->np.local_ip = in_aton(buf); |
0bcc1816 SS |
441 | |
442 | return strnlen(buf, count); | |
443 | } | |
444 | ||
445 | static ssize_t store_remote_ip(struct netconsole_target *nt, | |
446 | const char *buf, | |
447 | size_t count) | |
448 | { | |
449 | if (nt->enabled) { | |
450 | printk(KERN_ERR "netconsole: target (%s) is enabled, " | |
451 | "disable to update parameters\n", | |
452 | config_item_name(&nt->item)); | |
453 | return -EINVAL; | |
454 | } | |
455 | ||
e7557af5 | 456 | nt->np.remote_ip = in_aton(buf); |
0bcc1816 SS |
457 | |
458 | return strnlen(buf, count); | |
459 | } | |
460 | ||
461 | static ssize_t store_remote_mac(struct netconsole_target *nt, | |
462 | const char *buf, | |
463 | size_t count) | |
464 | { | |
465 | u8 remote_mac[ETH_ALEN]; | |
466 | char *p = (char *) buf; | |
467 | int i; | |
468 | ||
469 | if (nt->enabled) { | |
470 | printk(KERN_ERR "netconsole: target (%s) is enabled, " | |
471 | "disable to update parameters\n", | |
472 | config_item_name(&nt->item)); | |
473 | return -EINVAL; | |
474 | } | |
475 | ||
476 | for (i = 0; i < ETH_ALEN - 1; i++) { | |
477 | remote_mac[i] = simple_strtoul(p, &p, 16); | |
478 | if (*p != ':') | |
479 | goto invalid; | |
480 | p++; | |
481 | } | |
482 | remote_mac[ETH_ALEN - 1] = simple_strtoul(p, &p, 16); | |
483 | if (*p && (*p != '\n')) | |
484 | goto invalid; | |
485 | ||
486 | memcpy(nt->np.remote_mac, remote_mac, ETH_ALEN); | |
487 | ||
488 | return strnlen(buf, count); | |
489 | ||
490 | invalid: | |
491 | printk(KERN_ERR "netconsole: invalid input\n"); | |
492 | return -EINVAL; | |
493 | } | |
494 | ||
495 | /* | |
496 | * Attribute definitions for netconsole_target. | |
497 | */ | |
498 | ||
499 | #define NETCONSOLE_TARGET_ATTR_RO(_name) \ | |
500 | static struct netconsole_target_attr netconsole_target_##_name = \ | |
501 | __CONFIGFS_ATTR(_name, S_IRUGO, show_##_name, NULL) | |
502 | ||
503 | #define NETCONSOLE_TARGET_ATTR_RW(_name) \ | |
504 | static struct netconsole_target_attr netconsole_target_##_name = \ | |
505 | __CONFIGFS_ATTR(_name, S_IRUGO | S_IWUSR, show_##_name, store_##_name) | |
506 | ||
507 | NETCONSOLE_TARGET_ATTR_RW(enabled); | |
508 | NETCONSOLE_TARGET_ATTR_RW(dev_name); | |
509 | NETCONSOLE_TARGET_ATTR_RW(local_port); | |
510 | NETCONSOLE_TARGET_ATTR_RW(remote_port); | |
511 | NETCONSOLE_TARGET_ATTR_RW(local_ip); | |
512 | NETCONSOLE_TARGET_ATTR_RW(remote_ip); | |
513 | NETCONSOLE_TARGET_ATTR_RO(local_mac); | |
514 | NETCONSOLE_TARGET_ATTR_RW(remote_mac); | |
515 | ||
516 | static struct configfs_attribute *netconsole_target_attrs[] = { | |
517 | &netconsole_target_enabled.attr, | |
518 | &netconsole_target_dev_name.attr, | |
519 | &netconsole_target_local_port.attr, | |
520 | &netconsole_target_remote_port.attr, | |
521 | &netconsole_target_local_ip.attr, | |
522 | &netconsole_target_remote_ip.attr, | |
523 | &netconsole_target_local_mac.attr, | |
524 | &netconsole_target_remote_mac.attr, | |
525 | NULL, | |
526 | }; | |
527 | ||
528 | /* | |
529 | * Item operations and type for netconsole_target. | |
530 | */ | |
531 | ||
532 | static void netconsole_target_release(struct config_item *item) | |
533 | { | |
534 | kfree(to_target(item)); | |
535 | } | |
536 | ||
537 | static ssize_t netconsole_target_attr_show(struct config_item *item, | |
538 | struct configfs_attribute *attr, | |
539 | char *buf) | |
540 | { | |
541 | ssize_t ret = -EINVAL; | |
542 | struct netconsole_target *nt = to_target(item); | |
543 | struct netconsole_target_attr *na = | |
544 | container_of(attr, struct netconsole_target_attr, attr); | |
545 | ||
546 | if (na->show) | |
547 | ret = na->show(nt, buf); | |
548 | ||
549 | return ret; | |
550 | } | |
551 | ||
552 | static ssize_t netconsole_target_attr_store(struct config_item *item, | |
553 | struct configfs_attribute *attr, | |
554 | const char *buf, | |
555 | size_t count) | |
556 | { | |
557 | ssize_t ret = -EINVAL; | |
558 | struct netconsole_target *nt = to_target(item); | |
559 | struct netconsole_target_attr *na = | |
560 | container_of(attr, struct netconsole_target_attr, attr); | |
561 | ||
562 | if (na->store) | |
563 | ret = na->store(nt, buf, count); | |
564 | ||
565 | return ret; | |
566 | } | |
567 | ||
568 | static struct configfs_item_operations netconsole_target_item_ops = { | |
569 | .release = netconsole_target_release, | |
570 | .show_attribute = netconsole_target_attr_show, | |
571 | .store_attribute = netconsole_target_attr_store, | |
572 | }; | |
573 | ||
574 | static struct config_item_type netconsole_target_type = { | |
575 | .ct_attrs = netconsole_target_attrs, | |
576 | .ct_item_ops = &netconsole_target_item_ops, | |
577 | .ct_owner = THIS_MODULE, | |
578 | }; | |
579 | ||
580 | /* | |
581 | * Group operations and type for netconsole_subsys. | |
582 | */ | |
583 | ||
f89ab861 JB |
584 | static struct config_item *make_netconsole_target(struct config_group *group, |
585 | const char *name) | |
0bcc1816 SS |
586 | { |
587 | unsigned long flags; | |
588 | struct netconsole_target *nt; | |
589 | ||
590 | /* | |
591 | * Allocate and initialize with defaults. | |
592 | * Target is disabled at creation (enabled == 0). | |
593 | */ | |
594 | nt = kzalloc(sizeof(*nt), GFP_KERNEL); | |
595 | if (!nt) { | |
596 | printk(KERN_ERR "netconsole: failed to allocate memory\n"); | |
a6795e9e | 597 | return ERR_PTR(-ENOMEM); |
0bcc1816 SS |
598 | } |
599 | ||
600 | nt->np.name = "netconsole"; | |
601 | strlcpy(nt->np.dev_name, "eth0", IFNAMSIZ); | |
602 | nt->np.local_port = 6665; | |
603 | nt->np.remote_port = 6666; | |
604 | memset(nt->np.remote_mac, 0xff, ETH_ALEN); | |
605 | ||
606 | /* Initialize the config_item member */ | |
607 | config_item_init_type_name(&nt->item, name, &netconsole_target_type); | |
608 | ||
609 | /* Adding, but it is disabled */ | |
610 | spin_lock_irqsave(&target_list_lock, flags); | |
611 | list_add(&nt->list, &target_list); | |
612 | spin_unlock_irqrestore(&target_list_lock, flags); | |
613 | ||
f89ab861 | 614 | return &nt->item; |
0bcc1816 SS |
615 | } |
616 | ||
617 | static void drop_netconsole_target(struct config_group *group, | |
618 | struct config_item *item) | |
619 | { | |
620 | unsigned long flags; | |
621 | struct netconsole_target *nt = to_target(item); | |
622 | ||
623 | spin_lock_irqsave(&target_list_lock, flags); | |
624 | list_del(&nt->list); | |
625 | spin_unlock_irqrestore(&target_list_lock, flags); | |
626 | ||
627 | /* | |
628 | * The target may have never been enabled, or was manually disabled | |
629 | * before being removed so netpoll may have already been cleaned up. | |
630 | */ | |
631 | if (nt->enabled) | |
632 | netpoll_cleanup(&nt->np); | |
633 | ||
634 | config_item_put(&nt->item); | |
635 | } | |
636 | ||
637 | static struct configfs_group_operations netconsole_subsys_group_ops = { | |
638 | .make_item = make_netconsole_target, | |
639 | .drop_item = drop_netconsole_target, | |
640 | }; | |
641 | ||
642 | static struct config_item_type netconsole_subsys_type = { | |
643 | .ct_group_ops = &netconsole_subsys_group_ops, | |
644 | .ct_owner = THIS_MODULE, | |
645 | }; | |
646 | ||
647 | /* The netconsole configfs subsystem */ | |
648 | static struct configfs_subsystem netconsole_subsys = { | |
649 | .su_group = { | |
650 | .cg_item = { | |
651 | .ci_namebuf = "netconsole", | |
652 | .ci_type = &netconsole_subsys_type, | |
653 | }, | |
654 | }, | |
655 | }; | |
656 | ||
657 | #endif /* CONFIG_NETCONSOLE_DYNAMIC */ | |
658 | ||
17951f34 SS |
659 | /* Handle network interface device notifications */ |
660 | static int netconsole_netdev_event(struct notifier_block *this, | |
661 | unsigned long event, | |
662 | void *ptr) | |
663 | { | |
b5427c27 SS |
664 | unsigned long flags; |
665 | struct netconsole_target *nt; | |
17951f34 | 666 | struct net_device *dev = ptr; |
17951f34 | 667 | |
0e34e931 WC |
668 | if (!(event == NETDEV_CHANGENAME || event == NETDEV_UNREGISTER || |
669 | event == NETDEV_BONDING_DESLAVE || event == NETDEV_GOING_DOWN)) | |
b5427c27 SS |
670 | goto done; |
671 | ||
672 | spin_lock_irqsave(&target_list_lock, flags); | |
673 | list_for_each_entry(nt, &target_list, list) { | |
0bcc1816 | 674 | netconsole_target_get(nt); |
b5427c27 SS |
675 | if (nt->np.dev == dev) { |
676 | switch (event) { | |
b5427c27 SS |
677 | case NETDEV_CHANGENAME: |
678 | strlcpy(nt->np.dev_name, dev->name, IFNAMSIZ); | |
679 | break; | |
2382b15b | 680 | case NETDEV_UNREGISTER: |
3b410a31 NH |
681 | /* |
682 | * rtnl_lock already held | |
683 | */ | |
684 | if (nt->np.dev) { | |
685 | __netpoll_cleanup(&nt->np); | |
686 | dev_put(nt->np.dev); | |
687 | nt->np.dev = NULL; | |
688 | } | |
0e34e931 WC |
689 | /* Fall through */ |
690 | case NETDEV_GOING_DOWN: | |
691 | case NETDEV_BONDING_DESLAVE: | |
2382b15b | 692 | nt->enabled = 0; |
2382b15b | 693 | break; |
b5427c27 | 694 | } |
17951f34 | 695 | } |
0bcc1816 | 696 | netconsole_target_put(nt); |
17951f34 | 697 | } |
b5427c27 | 698 | spin_unlock_irqrestore(&target_list_lock, flags); |
0e34e931 WC |
699 | if (event == NETDEV_UNREGISTER || event == NETDEV_BONDING_DESLAVE) |
700 | printk(KERN_INFO "netconsole: network logging stopped, " | |
701 | "interface %s %s\n", dev->name, | |
702 | event == NETDEV_UNREGISTER ? "unregistered" : "released slaves"); | |
17951f34 | 703 | |
b5427c27 | 704 | done: |
17951f34 SS |
705 | return NOTIFY_DONE; |
706 | } | |
707 | ||
708 | static struct notifier_block netconsole_netdev_notifier = { | |
709 | .notifier_call = netconsole_netdev_event, | |
710 | }; | |
711 | ||
1da177e4 LT |
712 | static void write_msg(struct console *con, const char *msg, unsigned int len) |
713 | { | |
714 | int frag, left; | |
715 | unsigned long flags; | |
b5427c27 SS |
716 | struct netconsole_target *nt; |
717 | const char *tmp; | |
718 | ||
719 | /* Avoid taking lock and disabling interrupts unnecessarily */ | |
720 | if (list_empty(&target_list)) | |
721 | return; | |
722 | ||
723 | spin_lock_irqsave(&target_list_lock, flags); | |
724 | list_for_each_entry(nt, &target_list, list) { | |
0bcc1816 SS |
725 | netconsole_target_get(nt); |
726 | if (nt->enabled && netif_running(nt->np.dev)) { | |
b5427c27 SS |
727 | /* |
728 | * We nest this inside the for-each-target loop above | |
729 | * so that we're able to get as much logging out to | |
730 | * at least one target if we die inside here, instead | |
731 | * of unnecessarily keeping all targets in lock-step. | |
732 | */ | |
733 | tmp = msg; | |
734 | for (left = len; left;) { | |
735 | frag = min(left, MAX_PRINT_CHUNK); | |
736 | netpoll_send_udp(&nt->np, tmp, frag); | |
737 | tmp += frag; | |
738 | left -= frag; | |
739 | } | |
0cc120be | 740 | } |
0bcc1816 | 741 | netconsole_target_put(nt); |
1da177e4 | 742 | } |
b5427c27 | 743 | spin_unlock_irqrestore(&target_list_lock, flags); |
1da177e4 LT |
744 | } |
745 | ||
746 | static struct console netconsole = { | |
d39badf0 | 747 | .name = "netcon", |
0517deed | 748 | .flags = CON_ENABLED, |
d39badf0 | 749 | .write = write_msg, |
1da177e4 LT |
750 | }; |
751 | ||
d39badf0 | 752 | static int __init init_netconsole(void) |
1da177e4 | 753 | { |
0bcc1816 | 754 | int err; |
b5427c27 SS |
755 | struct netconsole_target *nt, *tmp; |
756 | unsigned long flags; | |
757 | char *target_config; | |
758 | char *input = config; | |
b41848b6 | 759 | |
0bcc1816 SS |
760 | if (strnlen(input, MAX_PARAM_LENGTH)) { |
761 | while ((target_config = strsep(&input, ";"))) { | |
762 | nt = alloc_param_target(target_config); | |
763 | if (IS_ERR(nt)) { | |
764 | err = PTR_ERR(nt); | |
765 | goto fail; | |
766 | } | |
0517deed ME |
767 | /* Dump existing printks when we register */ |
768 | netconsole.flags |= CON_PRINTBUFFER; | |
769 | ||
0bcc1816 SS |
770 | spin_lock_irqsave(&target_list_lock, flags); |
771 | list_add(&nt->list, &target_list); | |
772 | spin_unlock_irqrestore(&target_list_lock, flags); | |
b5427c27 | 773 | } |
b5427c27 | 774 | } |
1da177e4 | 775 | |
17951f34 SS |
776 | err = register_netdevice_notifier(&netconsole_netdev_notifier); |
777 | if (err) | |
b5427c27 | 778 | goto fail; |
17951f34 | 779 | |
0bcc1816 SS |
780 | err = dynamic_netconsole_init(); |
781 | if (err) | |
782 | goto undonotifier; | |
783 | ||
1da177e4 LT |
784 | register_console(&netconsole); |
785 | printk(KERN_INFO "netconsole: network logging started\n"); | |
d39badf0 | 786 | |
d39badf0 | 787 | return err; |
b5427c27 | 788 | |
0bcc1816 SS |
789 | undonotifier: |
790 | unregister_netdevice_notifier(&netconsole_netdev_notifier); | |
791 | ||
b5427c27 SS |
792 | fail: |
793 | printk(KERN_ERR "netconsole: cleaning up\n"); | |
794 | ||
795 | /* | |
0bcc1816 SS |
796 | * Remove all targets and destroy them (only targets created |
797 | * from the boot/module option exist here). Skipping the list | |
b5427c27 SS |
798 | * lock is safe here, and netpoll_cleanup() will sleep. |
799 | */ | |
800 | list_for_each_entry_safe(nt, tmp, &target_list, list) { | |
801 | list_del(&nt->list); | |
0bcc1816 | 802 | free_param_target(nt); |
b5427c27 SS |
803 | } |
804 | ||
805 | return err; | |
1da177e4 LT |
806 | } |
807 | ||
d39badf0 | 808 | static void __exit cleanup_netconsole(void) |
1da177e4 | 809 | { |
b5427c27 | 810 | struct netconsole_target *nt, *tmp; |
df180e36 | 811 | |
1da177e4 | 812 | unregister_console(&netconsole); |
0bcc1816 | 813 | dynamic_netconsole_exit(); |
17951f34 | 814 | unregister_netdevice_notifier(&netconsole_netdev_notifier); |
b5427c27 SS |
815 | |
816 | /* | |
0bcc1816 SS |
817 | * Targets created via configfs pin references on our module |
818 | * and would first be rmdir(2)'ed from userspace. We reach | |
819 | * here only when they are already destroyed, and only those | |
820 | * created from the boot/module option are left, so remove and | |
821 | * destroy them. Skipping the list lock is safe here, and | |
822 | * netpoll_cleanup() will sleep. | |
b5427c27 SS |
823 | */ |
824 | list_for_each_entry_safe(nt, tmp, &target_list, list) { | |
825 | list_del(&nt->list); | |
0bcc1816 | 826 | free_param_target(nt); |
b5427c27 | 827 | } |
1da177e4 LT |
828 | } |
829 | ||
830 | module_init(init_netconsole); | |
831 | module_exit(cleanup_netconsole); |