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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 | ||
0bcc1816 SS |
244 | /* |
245 | * Attribute operations for netconsole_target. | |
246 | */ | |
247 | ||
248 | static ssize_t show_enabled(struct netconsole_target *nt, char *buf) | |
249 | { | |
250 | return snprintf(buf, PAGE_SIZE, "%d\n", nt->enabled); | |
251 | } | |
252 | ||
253 | static ssize_t show_dev_name(struct netconsole_target *nt, char *buf) | |
254 | { | |
255 | return snprintf(buf, PAGE_SIZE, "%s\n", nt->np.dev_name); | |
256 | } | |
257 | ||
258 | static ssize_t show_local_port(struct netconsole_target *nt, char *buf) | |
259 | { | |
260 | return snprintf(buf, PAGE_SIZE, "%d\n", nt->np.local_port); | |
261 | } | |
262 | ||
263 | static ssize_t show_remote_port(struct netconsole_target *nt, char *buf) | |
264 | { | |
265 | return snprintf(buf, PAGE_SIZE, "%d\n", nt->np.remote_port); | |
266 | } | |
267 | ||
268 | static ssize_t show_local_ip(struct netconsole_target *nt, char *buf) | |
269 | { | |
e7557af5 | 270 | return snprintf(buf, PAGE_SIZE, "%pI4\n", &nt->np.local_ip); |
0bcc1816 SS |
271 | } |
272 | ||
273 | static ssize_t show_remote_ip(struct netconsole_target *nt, char *buf) | |
274 | { | |
e7557af5 | 275 | return snprintf(buf, PAGE_SIZE, "%pI4\n", &nt->np.remote_ip); |
0bcc1816 SS |
276 | } |
277 | ||
278 | static ssize_t show_local_mac(struct netconsole_target *nt, char *buf) | |
279 | { | |
09538641 | 280 | struct net_device *dev = nt->np.dev; |
e174961c | 281 | static const u8 bcast[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; |
09538641 | 282 | |
e174961c | 283 | return snprintf(buf, PAGE_SIZE, "%pM\n", dev ? dev->dev_addr : bcast); |
0bcc1816 SS |
284 | } |
285 | ||
286 | static ssize_t show_remote_mac(struct netconsole_target *nt, char *buf) | |
287 | { | |
e174961c | 288 | return snprintf(buf, PAGE_SIZE, "%pM\n", nt->np.remote_mac); |
0bcc1816 SS |
289 | } |
290 | ||
291 | /* | |
292 | * This one is special -- targets created through the configfs interface | |
293 | * are not enabled (and the corresponding netpoll activated) by default. | |
294 | * The user is expected to set the desired parameters first (which | |
295 | * would enable him to dynamically add new netpoll targets for new | |
296 | * network interfaces as and when they come up). | |
297 | */ | |
298 | static ssize_t store_enabled(struct netconsole_target *nt, | |
299 | const char *buf, | |
300 | size_t count) | |
301 | { | |
99f823f9 | 302 | int enabled; |
0bcc1816 | 303 | int err; |
0bcc1816 | 304 | |
99f823f9 AD |
305 | err = kstrtoint(buf, 10, &enabled); |
306 | if (err < 0) | |
307 | return err; | |
308 | if (enabled < 0 || enabled > 1) | |
309 | return -EINVAL; | |
d5123480 G |
310 | if (enabled == nt->enabled) { |
311 | printk(KERN_INFO "netconsole: network logging has already %s\n", | |
312 | nt->enabled ? "started" : "stopped"); | |
313 | return -EINVAL; | |
314 | } | |
0bcc1816 SS |
315 | |
316 | if (enabled) { /* 1 */ | |
317 | ||
318 | /* | |
319 | * Skip netpoll_parse_options() -- all the attributes are | |
320 | * already configured via configfs. Just print them out. | |
321 | */ | |
322 | netpoll_print_options(&nt->np); | |
323 | ||
324 | err = netpoll_setup(&nt->np); | |
325 | if (err) | |
326 | return err; | |
327 | ||
328 | printk(KERN_INFO "netconsole: network logging started\n"); | |
329 | ||
330 | } else { /* 0 */ | |
331 | netpoll_cleanup(&nt->np); | |
332 | } | |
333 | ||
334 | nt->enabled = enabled; | |
335 | ||
336 | return strnlen(buf, count); | |
337 | } | |
338 | ||
339 | static ssize_t store_dev_name(struct netconsole_target *nt, | |
340 | const char *buf, | |
341 | size_t count) | |
342 | { | |
343 | size_t len; | |
344 | ||
345 | if (nt->enabled) { | |
346 | printk(KERN_ERR "netconsole: target (%s) is enabled, " | |
347 | "disable to update parameters\n", | |
348 | config_item_name(&nt->item)); | |
349 | return -EINVAL; | |
350 | } | |
351 | ||
352 | strlcpy(nt->np.dev_name, buf, IFNAMSIZ); | |
353 | ||
354 | /* Get rid of possible trailing newline from echo(1) */ | |
355 | len = strnlen(nt->np.dev_name, IFNAMSIZ); | |
356 | if (nt->np.dev_name[len - 1] == '\n') | |
357 | nt->np.dev_name[len - 1] = '\0'; | |
358 | ||
359 | return strnlen(buf, count); | |
360 | } | |
361 | ||
362 | static ssize_t store_local_port(struct netconsole_target *nt, | |
363 | const char *buf, | |
364 | size_t count) | |
365 | { | |
99f823f9 | 366 | int rv; |
0bcc1816 SS |
367 | |
368 | if (nt->enabled) { | |
369 | printk(KERN_ERR "netconsole: target (%s) is enabled, " | |
370 | "disable to update parameters\n", | |
371 | config_item_name(&nt->item)); | |
372 | return -EINVAL; | |
373 | } | |
374 | ||
99f823f9 AD |
375 | rv = kstrtou16(buf, 10, &nt->np.local_port); |
376 | if (rv < 0) | |
377 | return rv; | |
0bcc1816 SS |
378 | return strnlen(buf, count); |
379 | } | |
380 | ||
381 | static ssize_t store_remote_port(struct netconsole_target *nt, | |
382 | const char *buf, | |
383 | size_t count) | |
384 | { | |
99f823f9 | 385 | int rv; |
0bcc1816 SS |
386 | |
387 | if (nt->enabled) { | |
388 | printk(KERN_ERR "netconsole: target (%s) is enabled, " | |
389 | "disable to update parameters\n", | |
390 | config_item_name(&nt->item)); | |
391 | return -EINVAL; | |
392 | } | |
393 | ||
99f823f9 AD |
394 | rv = kstrtou16(buf, 10, &nt->np.remote_port); |
395 | if (rv < 0) | |
396 | return rv; | |
0bcc1816 SS |
397 | return strnlen(buf, count); |
398 | } | |
399 | ||
400 | static ssize_t store_local_ip(struct netconsole_target *nt, | |
401 | const char *buf, | |
402 | size_t count) | |
403 | { | |
404 | if (nt->enabled) { | |
405 | printk(KERN_ERR "netconsole: target (%s) is enabled, " | |
406 | "disable to update parameters\n", | |
407 | config_item_name(&nt->item)); | |
408 | return -EINVAL; | |
409 | } | |
410 | ||
e7557af5 | 411 | nt->np.local_ip = in_aton(buf); |
0bcc1816 SS |
412 | |
413 | return strnlen(buf, count); | |
414 | } | |
415 | ||
416 | static ssize_t store_remote_ip(struct netconsole_target *nt, | |
417 | const char *buf, | |
418 | size_t count) | |
419 | { | |
420 | if (nt->enabled) { | |
421 | printk(KERN_ERR "netconsole: target (%s) is enabled, " | |
422 | "disable to update parameters\n", | |
423 | config_item_name(&nt->item)); | |
424 | return -EINVAL; | |
425 | } | |
426 | ||
e7557af5 | 427 | nt->np.remote_ip = in_aton(buf); |
0bcc1816 SS |
428 | |
429 | return strnlen(buf, count); | |
430 | } | |
431 | ||
432 | static ssize_t store_remote_mac(struct netconsole_target *nt, | |
433 | const char *buf, | |
434 | size_t count) | |
435 | { | |
436 | u8 remote_mac[ETH_ALEN]; | |
0bcc1816 SS |
437 | |
438 | if (nt->enabled) { | |
439 | printk(KERN_ERR "netconsole: target (%s) is enabled, " | |
440 | "disable to update parameters\n", | |
441 | config_item_name(&nt->item)); | |
442 | return -EINVAL; | |
443 | } | |
444 | ||
4940fc88 AD |
445 | if (!mac_pton(buf, remote_mac)) |
446 | return -EINVAL; | |
447 | if (buf[3 * ETH_ALEN - 1] && buf[3 * ETH_ALEN - 1] != '\n') | |
448 | return -EINVAL; | |
0bcc1816 SS |
449 | memcpy(nt->np.remote_mac, remote_mac, ETH_ALEN); |
450 | ||
451 | return strnlen(buf, count); | |
0bcc1816 SS |
452 | } |
453 | ||
454 | /* | |
455 | * Attribute definitions for netconsole_target. | |
456 | */ | |
457 | ||
458 | #define NETCONSOLE_TARGET_ATTR_RO(_name) \ | |
459 | static struct netconsole_target_attr netconsole_target_##_name = \ | |
460 | __CONFIGFS_ATTR(_name, S_IRUGO, show_##_name, NULL) | |
461 | ||
462 | #define NETCONSOLE_TARGET_ATTR_RW(_name) \ | |
463 | static struct netconsole_target_attr netconsole_target_##_name = \ | |
464 | __CONFIGFS_ATTR(_name, S_IRUGO | S_IWUSR, show_##_name, store_##_name) | |
465 | ||
466 | NETCONSOLE_TARGET_ATTR_RW(enabled); | |
467 | NETCONSOLE_TARGET_ATTR_RW(dev_name); | |
468 | NETCONSOLE_TARGET_ATTR_RW(local_port); | |
469 | NETCONSOLE_TARGET_ATTR_RW(remote_port); | |
470 | NETCONSOLE_TARGET_ATTR_RW(local_ip); | |
471 | NETCONSOLE_TARGET_ATTR_RW(remote_ip); | |
472 | NETCONSOLE_TARGET_ATTR_RO(local_mac); | |
473 | NETCONSOLE_TARGET_ATTR_RW(remote_mac); | |
474 | ||
475 | static struct configfs_attribute *netconsole_target_attrs[] = { | |
476 | &netconsole_target_enabled.attr, | |
477 | &netconsole_target_dev_name.attr, | |
478 | &netconsole_target_local_port.attr, | |
479 | &netconsole_target_remote_port.attr, | |
480 | &netconsole_target_local_ip.attr, | |
481 | &netconsole_target_remote_ip.attr, | |
482 | &netconsole_target_local_mac.attr, | |
483 | &netconsole_target_remote_mac.attr, | |
484 | NULL, | |
485 | }; | |
486 | ||
487 | /* | |
488 | * Item operations and type for netconsole_target. | |
489 | */ | |
490 | ||
491 | static void netconsole_target_release(struct config_item *item) | |
492 | { | |
493 | kfree(to_target(item)); | |
494 | } | |
495 | ||
496 | static ssize_t netconsole_target_attr_show(struct config_item *item, | |
497 | struct configfs_attribute *attr, | |
498 | char *buf) | |
499 | { | |
500 | ssize_t ret = -EINVAL; | |
501 | struct netconsole_target *nt = to_target(item); | |
502 | struct netconsole_target_attr *na = | |
503 | container_of(attr, struct netconsole_target_attr, attr); | |
504 | ||
505 | if (na->show) | |
506 | ret = na->show(nt, buf); | |
507 | ||
508 | return ret; | |
509 | } | |
510 | ||
511 | static ssize_t netconsole_target_attr_store(struct config_item *item, | |
512 | struct configfs_attribute *attr, | |
513 | const char *buf, | |
514 | size_t count) | |
515 | { | |
516 | ssize_t ret = -EINVAL; | |
517 | struct netconsole_target *nt = to_target(item); | |
518 | struct netconsole_target_attr *na = | |
519 | container_of(attr, struct netconsole_target_attr, attr); | |
520 | ||
521 | if (na->store) | |
522 | ret = na->store(nt, buf, count); | |
523 | ||
524 | return ret; | |
525 | } | |
526 | ||
527 | static struct configfs_item_operations netconsole_target_item_ops = { | |
528 | .release = netconsole_target_release, | |
529 | .show_attribute = netconsole_target_attr_show, | |
530 | .store_attribute = netconsole_target_attr_store, | |
531 | }; | |
532 | ||
533 | static struct config_item_type netconsole_target_type = { | |
534 | .ct_attrs = netconsole_target_attrs, | |
535 | .ct_item_ops = &netconsole_target_item_ops, | |
536 | .ct_owner = THIS_MODULE, | |
537 | }; | |
538 | ||
539 | /* | |
540 | * Group operations and type for netconsole_subsys. | |
541 | */ | |
542 | ||
f89ab861 JB |
543 | static struct config_item *make_netconsole_target(struct config_group *group, |
544 | const char *name) | |
0bcc1816 SS |
545 | { |
546 | unsigned long flags; | |
547 | struct netconsole_target *nt; | |
548 | ||
549 | /* | |
550 | * Allocate and initialize with defaults. | |
551 | * Target is disabled at creation (enabled == 0). | |
552 | */ | |
553 | nt = kzalloc(sizeof(*nt), GFP_KERNEL); | |
554 | if (!nt) { | |
555 | printk(KERN_ERR "netconsole: failed to allocate memory\n"); | |
a6795e9e | 556 | return ERR_PTR(-ENOMEM); |
0bcc1816 SS |
557 | } |
558 | ||
559 | nt->np.name = "netconsole"; | |
560 | strlcpy(nt->np.dev_name, "eth0", IFNAMSIZ); | |
561 | nt->np.local_port = 6665; | |
562 | nt->np.remote_port = 6666; | |
563 | memset(nt->np.remote_mac, 0xff, ETH_ALEN); | |
564 | ||
565 | /* Initialize the config_item member */ | |
566 | config_item_init_type_name(&nt->item, name, &netconsole_target_type); | |
567 | ||
568 | /* Adding, but it is disabled */ | |
569 | spin_lock_irqsave(&target_list_lock, flags); | |
570 | list_add(&nt->list, &target_list); | |
571 | spin_unlock_irqrestore(&target_list_lock, flags); | |
572 | ||
f89ab861 | 573 | return &nt->item; |
0bcc1816 SS |
574 | } |
575 | ||
576 | static void drop_netconsole_target(struct config_group *group, | |
577 | struct config_item *item) | |
578 | { | |
579 | unsigned long flags; | |
580 | struct netconsole_target *nt = to_target(item); | |
581 | ||
582 | spin_lock_irqsave(&target_list_lock, flags); | |
583 | list_del(&nt->list); | |
584 | spin_unlock_irqrestore(&target_list_lock, flags); | |
585 | ||
586 | /* | |
587 | * The target may have never been enabled, or was manually disabled | |
588 | * before being removed so netpoll may have already been cleaned up. | |
589 | */ | |
590 | if (nt->enabled) | |
591 | netpoll_cleanup(&nt->np); | |
592 | ||
593 | config_item_put(&nt->item); | |
594 | } | |
595 | ||
596 | static struct configfs_group_operations netconsole_subsys_group_ops = { | |
597 | .make_item = make_netconsole_target, | |
598 | .drop_item = drop_netconsole_target, | |
599 | }; | |
600 | ||
601 | static struct config_item_type netconsole_subsys_type = { | |
602 | .ct_group_ops = &netconsole_subsys_group_ops, | |
603 | .ct_owner = THIS_MODULE, | |
604 | }; | |
605 | ||
606 | /* The netconsole configfs subsystem */ | |
607 | static struct configfs_subsystem netconsole_subsys = { | |
608 | .su_group = { | |
609 | .cg_item = { | |
610 | .ci_namebuf = "netconsole", | |
611 | .ci_type = &netconsole_subsys_type, | |
612 | }, | |
613 | }, | |
614 | }; | |
615 | ||
616 | #endif /* CONFIG_NETCONSOLE_DYNAMIC */ | |
617 | ||
17951f34 SS |
618 | /* Handle network interface device notifications */ |
619 | static int netconsole_netdev_event(struct notifier_block *this, | |
620 | unsigned long event, | |
621 | void *ptr) | |
622 | { | |
b5427c27 SS |
623 | unsigned long flags; |
624 | struct netconsole_target *nt; | |
17951f34 | 625 | struct net_device *dev = ptr; |
141dfba3 | 626 | bool stopped = false; |
17951f34 | 627 | |
0e34e931 | 628 | if (!(event == NETDEV_CHANGENAME || event == NETDEV_UNREGISTER || |
daf9209b | 629 | event == NETDEV_RELEASE || event == NETDEV_JOIN)) |
b5427c27 SS |
630 | goto done; |
631 | ||
632 | spin_lock_irqsave(&target_list_lock, flags); | |
633 | list_for_each_entry(nt, &target_list, list) { | |
0bcc1816 | 634 | netconsole_target_get(nt); |
b5427c27 SS |
635 | if (nt->np.dev == dev) { |
636 | switch (event) { | |
b5427c27 SS |
637 | case NETDEV_CHANGENAME: |
638 | strlcpy(nt->np.dev_name, dev->name, IFNAMSIZ); | |
639 | break; | |
daf9209b | 640 | case NETDEV_RELEASE: |
8d8fc29d | 641 | case NETDEV_JOIN: |
2382b15b | 642 | case NETDEV_UNREGISTER: |
3b410a31 NH |
643 | /* |
644 | * rtnl_lock already held | |
645 | */ | |
646 | if (nt->np.dev) { | |
13f172ff NH |
647 | spin_unlock_irqrestore( |
648 | &target_list_lock, | |
649 | flags); | |
3b410a31 | 650 | __netpoll_cleanup(&nt->np); |
13f172ff NH |
651 | spin_lock_irqsave(&target_list_lock, |
652 | flags); | |
3b410a31 NH |
653 | dev_put(nt->np.dev); |
654 | nt->np.dev = NULL; | |
13f172ff | 655 | netconsole_target_put(nt); |
3b410a31 | 656 | } |
2382b15b | 657 | nt->enabled = 0; |
141dfba3 | 658 | stopped = true; |
2382b15b | 659 | break; |
b5427c27 | 660 | } |
17951f34 | 661 | } |
0bcc1816 | 662 | netconsole_target_put(nt); |
17951f34 | 663 | } |
b5427c27 | 664 | spin_unlock_irqrestore(&target_list_lock, flags); |
8d8fc29d | 665 | if (stopped) { |
38cfb907 | 666 | printk(KERN_INFO "netconsole: network logging stopped on " |
8d8fc29d AW |
667 | "interface %s as it ", dev->name); |
668 | switch (event) { | |
669 | case NETDEV_UNREGISTER: | |
670 | printk(KERN_CONT "unregistered\n"); | |
671 | break; | |
daf9209b | 672 | case NETDEV_RELEASE: |
8d8fc29d AW |
673 | printk(KERN_CONT "released slaves\n"); |
674 | break; | |
675 | case NETDEV_JOIN: | |
676 | printk(KERN_CONT "is joining a master device\n"); | |
677 | break; | |
678 | } | |
679 | } | |
17951f34 | 680 | |
b5427c27 | 681 | done: |
17951f34 SS |
682 | return NOTIFY_DONE; |
683 | } | |
684 | ||
685 | static struct notifier_block netconsole_netdev_notifier = { | |
686 | .notifier_call = netconsole_netdev_event, | |
687 | }; | |
688 | ||
1da177e4 LT |
689 | static void write_msg(struct console *con, const char *msg, unsigned int len) |
690 | { | |
691 | int frag, left; | |
692 | unsigned long flags; | |
b5427c27 SS |
693 | struct netconsole_target *nt; |
694 | const char *tmp; | |
695 | ||
696 | /* Avoid taking lock and disabling interrupts unnecessarily */ | |
697 | if (list_empty(&target_list)) | |
698 | return; | |
699 | ||
700 | spin_lock_irqsave(&target_list_lock, flags); | |
701 | list_for_each_entry(nt, &target_list, list) { | |
0bcc1816 SS |
702 | netconsole_target_get(nt); |
703 | if (nt->enabled && netif_running(nt->np.dev)) { | |
b5427c27 SS |
704 | /* |
705 | * We nest this inside the for-each-target loop above | |
706 | * so that we're able to get as much logging out to | |
707 | * at least one target if we die inside here, instead | |
708 | * of unnecessarily keeping all targets in lock-step. | |
709 | */ | |
710 | tmp = msg; | |
711 | for (left = len; left;) { | |
712 | frag = min(left, MAX_PRINT_CHUNK); | |
713 | netpoll_send_udp(&nt->np, tmp, frag); | |
714 | tmp += frag; | |
715 | left -= frag; | |
716 | } | |
0cc120be | 717 | } |
0bcc1816 | 718 | netconsole_target_put(nt); |
1da177e4 | 719 | } |
b5427c27 | 720 | spin_unlock_irqrestore(&target_list_lock, flags); |
1da177e4 LT |
721 | } |
722 | ||
723 | static struct console netconsole = { | |
d39badf0 | 724 | .name = "netcon", |
0517deed | 725 | .flags = CON_ENABLED, |
d39badf0 | 726 | .write = write_msg, |
1da177e4 LT |
727 | }; |
728 | ||
d39badf0 | 729 | static int __init init_netconsole(void) |
1da177e4 | 730 | { |
0bcc1816 | 731 | int err; |
b5427c27 SS |
732 | struct netconsole_target *nt, *tmp; |
733 | unsigned long flags; | |
734 | char *target_config; | |
735 | char *input = config; | |
b41848b6 | 736 | |
0bcc1816 SS |
737 | if (strnlen(input, MAX_PARAM_LENGTH)) { |
738 | while ((target_config = strsep(&input, ";"))) { | |
739 | nt = alloc_param_target(target_config); | |
740 | if (IS_ERR(nt)) { | |
741 | err = PTR_ERR(nt); | |
742 | goto fail; | |
743 | } | |
0517deed ME |
744 | /* Dump existing printks when we register */ |
745 | netconsole.flags |= CON_PRINTBUFFER; | |
746 | ||
0bcc1816 SS |
747 | spin_lock_irqsave(&target_list_lock, flags); |
748 | list_add(&nt->list, &target_list); | |
749 | spin_unlock_irqrestore(&target_list_lock, flags); | |
b5427c27 | 750 | } |
b5427c27 | 751 | } |
1da177e4 | 752 | |
17951f34 SS |
753 | err = register_netdevice_notifier(&netconsole_netdev_notifier); |
754 | if (err) | |
b5427c27 | 755 | goto fail; |
17951f34 | 756 | |
0bcc1816 SS |
757 | err = dynamic_netconsole_init(); |
758 | if (err) | |
759 | goto undonotifier; | |
760 | ||
1da177e4 LT |
761 | register_console(&netconsole); |
762 | printk(KERN_INFO "netconsole: network logging started\n"); | |
d39badf0 | 763 | |
d39badf0 | 764 | return err; |
b5427c27 | 765 | |
0bcc1816 SS |
766 | undonotifier: |
767 | unregister_netdevice_notifier(&netconsole_netdev_notifier); | |
768 | ||
b5427c27 SS |
769 | fail: |
770 | printk(KERN_ERR "netconsole: cleaning up\n"); | |
771 | ||
772 | /* | |
0bcc1816 SS |
773 | * Remove all targets and destroy them (only targets created |
774 | * from the boot/module option exist here). Skipping the list | |
b5427c27 SS |
775 | * lock is safe here, and netpoll_cleanup() will sleep. |
776 | */ | |
777 | list_for_each_entry_safe(nt, tmp, &target_list, list) { | |
778 | list_del(&nt->list); | |
0bcc1816 | 779 | free_param_target(nt); |
b5427c27 SS |
780 | } |
781 | ||
782 | return err; | |
1da177e4 LT |
783 | } |
784 | ||
d39badf0 | 785 | static void __exit cleanup_netconsole(void) |
1da177e4 | 786 | { |
b5427c27 | 787 | struct netconsole_target *nt, *tmp; |
df180e36 | 788 | |
1da177e4 | 789 | unregister_console(&netconsole); |
0bcc1816 | 790 | dynamic_netconsole_exit(); |
17951f34 | 791 | unregister_netdevice_notifier(&netconsole_netdev_notifier); |
b5427c27 SS |
792 | |
793 | /* | |
0bcc1816 SS |
794 | * Targets created via configfs pin references on our module |
795 | * and would first be rmdir(2)'ed from userspace. We reach | |
796 | * here only when they are already destroyed, and only those | |
797 | * created from the boot/module option are left, so remove and | |
798 | * destroy them. Skipping the list lock is safe here, and | |
799 | * netpoll_cleanup() will sleep. | |
b5427c27 SS |
800 | */ |
801 | list_for_each_entry_safe(nt, tmp, &target_list, list) { | |
802 | list_del(&nt->list); | |
0bcc1816 | 803 | free_param_target(nt); |
b5427c27 | 804 | } |
1da177e4 LT |
805 | } |
806 | ||
97c7de05 LM |
807 | /* |
808 | * Use late_initcall to ensure netconsole is | |
809 | * initialized after network device driver if built-in. | |
810 | * | |
811 | * late_initcall() and module_init() are identical if built as module. | |
812 | */ | |
813 | late_initcall(init_netconsole); | |
1da177e4 | 814 | module_exit(cleanup_netconsole); |