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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 | 42 | #include <linux/moduleparam.h> |
4cd5773a | 43 | #include <linux/kernel.h> |
1da177e4 | 44 | #include <linux/string.h> |
1da177e4 | 45 | #include <linux/netpoll.h> |
0bcc1816 SS |
46 | #include <linux/inet.h> |
47 | #include <linux/configfs.h> | |
1da177e4 LT |
48 | |
49 | MODULE_AUTHOR("Maintainer: Matt Mackall <mpm@selenic.com>"); | |
50 | MODULE_DESCRIPTION("Console driver for network interfaces"); | |
51 | MODULE_LICENSE("GPL"); | |
52 | ||
d39badf0 SS |
53 | #define MAX_PARAM_LENGTH 256 |
54 | #define MAX_PRINT_CHUNK 1000 | |
55 | ||
56 | static char config[MAX_PARAM_LENGTH]; | |
57 | module_param_string(netconsole, config, MAX_PARAM_LENGTH, 0); | |
61a2d07d | 58 | MODULE_PARM_DESC(netconsole, " netconsole=[src-port]@[src-ip]/[dev],[tgt-port]@<tgt-ip>/[tgt-macaddr]"); |
1da177e4 | 59 | |
c1a60851 AW |
60 | static bool oops_only = false; |
61 | module_param(oops_only, bool, 0600); | |
62 | MODULE_PARM_DESC(oops_only, "Only log oops messages"); | |
63 | ||
d2b60881 SS |
64 | #ifndef MODULE |
65 | static int __init option_setup(char *opt) | |
66 | { | |
67 | strlcpy(config, opt, MAX_PARAM_LENGTH); | |
68 | return 1; | |
69 | } | |
70 | __setup("netconsole=", option_setup); | |
71 | #endif /* MODULE */ | |
72 | ||
b5427c27 SS |
73 | /* Linked list of all configured targets */ |
74 | static LIST_HEAD(target_list); | |
75 | ||
76 | /* This needs to be a spinlock because write_msg() cannot sleep */ | |
77 | static DEFINE_SPINLOCK(target_list_lock); | |
78 | ||
df180e36 SS |
79 | /** |
80 | * struct netconsole_target - Represents a configured netconsole target. | |
b5427c27 | 81 | * @list: Links this target into the target_list. |
0bcc1816 SS |
82 | * @item: Links us into the configfs subsystem hierarchy. |
83 | * @enabled: On / off knob to enable / disable target. | |
84 | * Visible from userspace (read-write). | |
85 | * We maintain a strict 1:1 correspondence between this and | |
86 | * whether the corresponding netpoll is active or inactive. | |
87 | * Also, other parameters of a target may be modified at | |
88 | * runtime only when it is disabled (enabled == 0). | |
df180e36 | 89 | * @np: The netpoll structure for this target. |
0bcc1816 SS |
90 | * Contains the other userspace visible parameters: |
91 | * dev_name (read-write) | |
92 | * local_port (read-write) | |
93 | * remote_port (read-write) | |
94 | * local_ip (read-write) | |
95 | * remote_ip (read-write) | |
96 | * local_mac (read-only) | |
97 | * remote_mac (read-write) | |
df180e36 SS |
98 | */ |
99 | struct netconsole_target { | |
b5427c27 | 100 | struct list_head list; |
0bcc1816 SS |
101 | #ifdef CONFIG_NETCONSOLE_DYNAMIC |
102 | struct config_item item; | |
103 | #endif | |
104 | int enabled; | |
7a163bfb | 105 | struct mutex mutex; |
df180e36 SS |
106 | struct netpoll np; |
107 | }; | |
108 | ||
0bcc1816 SS |
109 | #ifdef CONFIG_NETCONSOLE_DYNAMIC |
110 | ||
111 | static struct configfs_subsystem netconsole_subsys; | |
112 | ||
113 | static int __init dynamic_netconsole_init(void) | |
114 | { | |
115 | config_group_init(&netconsole_subsys.su_group); | |
116 | mutex_init(&netconsole_subsys.su_mutex); | |
117 | return configfs_register_subsystem(&netconsole_subsys); | |
118 | } | |
119 | ||
120 | static void __exit dynamic_netconsole_exit(void) | |
121 | { | |
122 | configfs_unregister_subsystem(&netconsole_subsys); | |
123 | } | |
124 | ||
125 | /* | |
126 | * Targets that were created by parsing the boot/module option string | |
127 | * do not exist in the configfs hierarchy (and have NULL names) and will | |
128 | * never go away, so make these a no-op for them. | |
129 | */ | |
130 | static void netconsole_target_get(struct netconsole_target *nt) | |
131 | { | |
132 | if (config_item_name(&nt->item)) | |
133 | config_item_get(&nt->item); | |
134 | } | |
135 | ||
136 | static void netconsole_target_put(struct netconsole_target *nt) | |
137 | { | |
138 | if (config_item_name(&nt->item)) | |
139 | config_item_put(&nt->item); | |
140 | } | |
141 | ||
142 | #else /* !CONFIG_NETCONSOLE_DYNAMIC */ | |
143 | ||
144 | static int __init dynamic_netconsole_init(void) | |
145 | { | |
146 | return 0; | |
147 | } | |
148 | ||
149 | static void __exit dynamic_netconsole_exit(void) | |
150 | { | |
151 | } | |
152 | ||
153 | /* | |
154 | * No danger of targets going away from under us when dynamic | |
155 | * reconfigurability is off. | |
156 | */ | |
157 | static void netconsole_target_get(struct netconsole_target *nt) | |
158 | { | |
159 | } | |
160 | ||
161 | static void netconsole_target_put(struct netconsole_target *nt) | |
162 | { | |
163 | } | |
164 | ||
165 | #endif /* CONFIG_NETCONSOLE_DYNAMIC */ | |
166 | ||
167 | /* Allocate new target (from boot/module param) and setup netpoll for it */ | |
168 | static struct netconsole_target *alloc_param_target(char *target_config) | |
b5427c27 SS |
169 | { |
170 | int err = -ENOMEM; | |
171 | struct netconsole_target *nt; | |
172 | ||
0bcc1816 SS |
173 | /* |
174 | * Allocate and initialize with defaults. | |
175 | * Note that these targets get their config_item fields zeroed-out. | |
176 | */ | |
b5427c27 | 177 | nt = kzalloc(sizeof(*nt), GFP_KERNEL); |
e404decb | 178 | if (!nt) |
b5427c27 | 179 | goto fail; |
b5427c27 SS |
180 | |
181 | nt->np.name = "netconsole"; | |
182 | strlcpy(nt->np.dev_name, "eth0", IFNAMSIZ); | |
183 | nt->np.local_port = 6665; | |
184 | nt->np.remote_port = 6666; | |
7a163bfb | 185 | mutex_init(&nt->mutex); |
b5427c27 SS |
186 | memset(nt->np.remote_mac, 0xff, ETH_ALEN); |
187 | ||
188 | /* Parse parameters and setup netpoll */ | |
189 | err = netpoll_parse_options(&nt->np, target_config); | |
190 | if (err) | |
191 | goto fail; | |
192 | ||
193 | err = netpoll_setup(&nt->np); | |
194 | if (err) | |
195 | goto fail; | |
196 | ||
0bcc1816 SS |
197 | nt->enabled = 1; |
198 | ||
b5427c27 SS |
199 | return nt; |
200 | ||
201 | fail: | |
202 | kfree(nt); | |
203 | return ERR_PTR(err); | |
204 | } | |
205 | ||
0bcc1816 SS |
206 | /* Cleanup netpoll for given target (from boot/module param) and free it */ |
207 | static void free_param_target(struct netconsole_target *nt) | |
b5427c27 SS |
208 | { |
209 | netpoll_cleanup(&nt->np); | |
210 | kfree(nt); | |
211 | } | |
1da177e4 | 212 | |
0bcc1816 SS |
213 | #ifdef CONFIG_NETCONSOLE_DYNAMIC |
214 | ||
215 | /* | |
216 | * Our subsystem hierarchy is: | |
217 | * | |
218 | * /sys/kernel/config/netconsole/ | |
219 | * | | |
220 | * <target>/ | |
221 | * | enabled | |
222 | * | dev_name | |
223 | * | local_port | |
224 | * | remote_port | |
225 | * | local_ip | |
226 | * | remote_ip | |
227 | * | local_mac | |
228 | * | remote_mac | |
229 | * | | |
230 | * <target>/... | |
231 | */ | |
232 | ||
233 | struct netconsole_target_attr { | |
234 | struct configfs_attribute attr; | |
235 | ssize_t (*show)(struct netconsole_target *nt, | |
236 | char *buf); | |
237 | ssize_t (*store)(struct netconsole_target *nt, | |
238 | const char *buf, | |
239 | size_t count); | |
240 | }; | |
241 | ||
242 | static struct netconsole_target *to_target(struct config_item *item) | |
243 | { | |
244 | return item ? | |
245 | container_of(item, struct netconsole_target, item) : | |
246 | NULL; | |
247 | } | |
248 | ||
0bcc1816 SS |
249 | /* |
250 | * Attribute operations for netconsole_target. | |
251 | */ | |
252 | ||
253 | static ssize_t show_enabled(struct netconsole_target *nt, char *buf) | |
254 | { | |
255 | return snprintf(buf, PAGE_SIZE, "%d\n", nt->enabled); | |
256 | } | |
257 | ||
258 | static ssize_t show_dev_name(struct netconsole_target *nt, char *buf) | |
259 | { | |
260 | return snprintf(buf, PAGE_SIZE, "%s\n", nt->np.dev_name); | |
261 | } | |
262 | ||
263 | static ssize_t show_local_port(struct netconsole_target *nt, char *buf) | |
264 | { | |
265 | return snprintf(buf, PAGE_SIZE, "%d\n", nt->np.local_port); | |
266 | } | |
267 | ||
268 | static ssize_t show_remote_port(struct netconsole_target *nt, char *buf) | |
269 | { | |
270 | return snprintf(buf, PAGE_SIZE, "%d\n", nt->np.remote_port); | |
271 | } | |
272 | ||
273 | static ssize_t show_local_ip(struct netconsole_target *nt, char *buf) | |
274 | { | |
b3d936f3 CW |
275 | if (nt->np.ipv6) |
276 | return snprintf(buf, PAGE_SIZE, "%pI6c\n", &nt->np.local_ip.in6); | |
277 | else | |
b7394d24 | 278 | return snprintf(buf, PAGE_SIZE, "%pI4\n", &nt->np.local_ip); |
0bcc1816 SS |
279 | } |
280 | ||
281 | static ssize_t show_remote_ip(struct netconsole_target *nt, char *buf) | |
282 | { | |
b3d936f3 CW |
283 | if (nt->np.ipv6) |
284 | return snprintf(buf, PAGE_SIZE, "%pI6c\n", &nt->np.remote_ip.in6); | |
285 | else | |
b7394d24 | 286 | return snprintf(buf, PAGE_SIZE, "%pI4\n", &nt->np.remote_ip); |
0bcc1816 SS |
287 | } |
288 | ||
289 | static ssize_t show_local_mac(struct netconsole_target *nt, char *buf) | |
290 | { | |
09538641 | 291 | struct net_device *dev = nt->np.dev; |
e174961c | 292 | static const u8 bcast[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; |
09538641 | 293 | |
e174961c | 294 | return snprintf(buf, PAGE_SIZE, "%pM\n", dev ? dev->dev_addr : bcast); |
0bcc1816 SS |
295 | } |
296 | ||
297 | static ssize_t show_remote_mac(struct netconsole_target *nt, char *buf) | |
298 | { | |
e174961c | 299 | return snprintf(buf, PAGE_SIZE, "%pM\n", nt->np.remote_mac); |
0bcc1816 SS |
300 | } |
301 | ||
302 | /* | |
303 | * This one is special -- targets created through the configfs interface | |
304 | * are not enabled (and the corresponding netpoll activated) by default. | |
305 | * The user is expected to set the desired parameters first (which | |
306 | * would enable him to dynamically add new netpoll targets for new | |
307 | * network interfaces as and when they come up). | |
308 | */ | |
309 | static ssize_t store_enabled(struct netconsole_target *nt, | |
310 | const char *buf, | |
311 | size_t count) | |
312 | { | |
99f823f9 | 313 | int enabled; |
0bcc1816 | 314 | int err; |
0bcc1816 | 315 | |
99f823f9 AD |
316 | err = kstrtoint(buf, 10, &enabled); |
317 | if (err < 0) | |
318 | return err; | |
319 | if (enabled < 0 || enabled > 1) | |
320 | return -EINVAL; | |
d5123480 G |
321 | if (enabled == nt->enabled) { |
322 | printk(KERN_INFO "netconsole: network logging has already %s\n", | |
323 | nt->enabled ? "started" : "stopped"); | |
324 | return -EINVAL; | |
325 | } | |
0bcc1816 | 326 | |
7a163bfb | 327 | mutex_lock(&nt->mutex); |
0bcc1816 SS |
328 | if (enabled) { /* 1 */ |
329 | ||
330 | /* | |
331 | * Skip netpoll_parse_options() -- all the attributes are | |
332 | * already configured via configfs. Just print them out. | |
333 | */ | |
334 | netpoll_print_options(&nt->np); | |
335 | ||
336 | err = netpoll_setup(&nt->np); | |
7a163bfb DA |
337 | if (err) { |
338 | mutex_unlock(&nt->mutex); | |
0bcc1816 | 339 | return err; |
7a163bfb | 340 | } |
0bcc1816 SS |
341 | |
342 | printk(KERN_INFO "netconsole: network logging started\n"); | |
343 | ||
344 | } else { /* 0 */ | |
345 | netpoll_cleanup(&nt->np); | |
346 | } | |
347 | ||
348 | nt->enabled = enabled; | |
7a163bfb | 349 | mutex_unlock(&nt->mutex); |
0bcc1816 SS |
350 | |
351 | return strnlen(buf, count); | |
352 | } | |
353 | ||
354 | static ssize_t store_dev_name(struct netconsole_target *nt, | |
355 | const char *buf, | |
356 | size_t count) | |
357 | { | |
358 | size_t len; | |
359 | ||
360 | if (nt->enabled) { | |
361 | printk(KERN_ERR "netconsole: target (%s) is enabled, " | |
362 | "disable to update parameters\n", | |
363 | config_item_name(&nt->item)); | |
364 | return -EINVAL; | |
365 | } | |
366 | ||
367 | strlcpy(nt->np.dev_name, buf, IFNAMSIZ); | |
368 | ||
369 | /* Get rid of possible trailing newline from echo(1) */ | |
370 | len = strnlen(nt->np.dev_name, IFNAMSIZ); | |
371 | if (nt->np.dev_name[len - 1] == '\n') | |
372 | nt->np.dev_name[len - 1] = '\0'; | |
373 | ||
374 | return strnlen(buf, count); | |
375 | } | |
376 | ||
377 | static ssize_t store_local_port(struct netconsole_target *nt, | |
378 | const char *buf, | |
379 | size_t count) | |
380 | { | |
99f823f9 | 381 | int rv; |
0bcc1816 SS |
382 | |
383 | if (nt->enabled) { | |
384 | printk(KERN_ERR "netconsole: target (%s) is enabled, " | |
385 | "disable to update parameters\n", | |
386 | config_item_name(&nt->item)); | |
387 | return -EINVAL; | |
388 | } | |
389 | ||
99f823f9 AD |
390 | rv = kstrtou16(buf, 10, &nt->np.local_port); |
391 | if (rv < 0) | |
392 | return rv; | |
0bcc1816 SS |
393 | return strnlen(buf, count); |
394 | } | |
395 | ||
396 | static ssize_t store_remote_port(struct netconsole_target *nt, | |
397 | const char *buf, | |
398 | size_t count) | |
399 | { | |
99f823f9 | 400 | int rv; |
0bcc1816 SS |
401 | |
402 | if (nt->enabled) { | |
403 | printk(KERN_ERR "netconsole: target (%s) is enabled, " | |
404 | "disable to update parameters\n", | |
405 | config_item_name(&nt->item)); | |
406 | return -EINVAL; | |
407 | } | |
408 | ||
99f823f9 AD |
409 | rv = kstrtou16(buf, 10, &nt->np.remote_port); |
410 | if (rv < 0) | |
411 | return rv; | |
0bcc1816 SS |
412 | return strnlen(buf, count); |
413 | } | |
414 | ||
415 | static ssize_t store_local_ip(struct netconsole_target *nt, | |
416 | const char *buf, | |
417 | size_t count) | |
418 | { | |
419 | if (nt->enabled) { | |
420 | printk(KERN_ERR "netconsole: target (%s) is enabled, " | |
421 | "disable to update parameters\n", | |
422 | config_item_name(&nt->item)); | |
423 | return -EINVAL; | |
424 | } | |
425 | ||
b3d936f3 CW |
426 | if (strnchr(buf, count, ':')) { |
427 | const char *end; | |
428 | if (in6_pton(buf, count, nt->np.local_ip.in6.s6_addr, -1, &end) > 0) { | |
429 | if (*end && *end != '\n') { | |
430 | printk(KERN_ERR "netconsole: invalid IPv6 address at: <%c>\n", *end); | |
431 | return -EINVAL; | |
432 | } | |
433 | nt->np.ipv6 = true; | |
434 | } else | |
435 | return -EINVAL; | |
436 | } else { | |
437 | if (!nt->np.ipv6) { | |
438 | nt->np.local_ip.ip = in_aton(buf); | |
439 | } else | |
440 | return -EINVAL; | |
441 | } | |
0bcc1816 SS |
442 | |
443 | return strnlen(buf, count); | |
444 | } | |
445 | ||
446 | static 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 | ||
b3d936f3 CW |
457 | if (strnchr(buf, count, ':')) { |
458 | const char *end; | |
459 | if (in6_pton(buf, count, nt->np.remote_ip.in6.s6_addr, -1, &end) > 0) { | |
460 | if (*end && *end != '\n') { | |
461 | printk(KERN_ERR "netconsole: invalid IPv6 address at: <%c>\n", *end); | |
462 | return -EINVAL; | |
463 | } | |
464 | nt->np.ipv6 = true; | |
465 | } else | |
466 | return -EINVAL; | |
467 | } else { | |
468 | if (!nt->np.ipv6) { | |
469 | nt->np.remote_ip.ip = in_aton(buf); | |
470 | } else | |
471 | return -EINVAL; | |
472 | } | |
0bcc1816 SS |
473 | |
474 | return strnlen(buf, count); | |
475 | } | |
476 | ||
477 | static ssize_t store_remote_mac(struct netconsole_target *nt, | |
478 | const char *buf, | |
479 | size_t count) | |
480 | { | |
481 | u8 remote_mac[ETH_ALEN]; | |
0bcc1816 SS |
482 | |
483 | if (nt->enabled) { | |
484 | printk(KERN_ERR "netconsole: target (%s) is enabled, " | |
485 | "disable to update parameters\n", | |
486 | config_item_name(&nt->item)); | |
487 | return -EINVAL; | |
488 | } | |
489 | ||
4940fc88 AD |
490 | if (!mac_pton(buf, remote_mac)) |
491 | return -EINVAL; | |
492 | if (buf[3 * ETH_ALEN - 1] && buf[3 * ETH_ALEN - 1] != '\n') | |
493 | return -EINVAL; | |
0bcc1816 SS |
494 | memcpy(nt->np.remote_mac, remote_mac, ETH_ALEN); |
495 | ||
496 | return strnlen(buf, count); | |
0bcc1816 SS |
497 | } |
498 | ||
499 | /* | |
500 | * Attribute definitions for netconsole_target. | |
501 | */ | |
502 | ||
503 | #define NETCONSOLE_TARGET_ATTR_RO(_name) \ | |
504 | static struct netconsole_target_attr netconsole_target_##_name = \ | |
505 | __CONFIGFS_ATTR(_name, S_IRUGO, show_##_name, NULL) | |
506 | ||
507 | #define NETCONSOLE_TARGET_ATTR_RW(_name) \ | |
508 | static struct netconsole_target_attr netconsole_target_##_name = \ | |
509 | __CONFIGFS_ATTR(_name, S_IRUGO | S_IWUSR, show_##_name, store_##_name) | |
510 | ||
511 | NETCONSOLE_TARGET_ATTR_RW(enabled); | |
512 | NETCONSOLE_TARGET_ATTR_RW(dev_name); | |
513 | NETCONSOLE_TARGET_ATTR_RW(local_port); | |
514 | NETCONSOLE_TARGET_ATTR_RW(remote_port); | |
515 | NETCONSOLE_TARGET_ATTR_RW(local_ip); | |
516 | NETCONSOLE_TARGET_ATTR_RW(remote_ip); | |
517 | NETCONSOLE_TARGET_ATTR_RO(local_mac); | |
518 | NETCONSOLE_TARGET_ATTR_RW(remote_mac); | |
519 | ||
520 | static struct configfs_attribute *netconsole_target_attrs[] = { | |
521 | &netconsole_target_enabled.attr, | |
522 | &netconsole_target_dev_name.attr, | |
523 | &netconsole_target_local_port.attr, | |
524 | &netconsole_target_remote_port.attr, | |
525 | &netconsole_target_local_ip.attr, | |
526 | &netconsole_target_remote_ip.attr, | |
527 | &netconsole_target_local_mac.attr, | |
528 | &netconsole_target_remote_mac.attr, | |
529 | NULL, | |
530 | }; | |
531 | ||
532 | /* | |
533 | * Item operations and type for netconsole_target. | |
534 | */ | |
535 | ||
536 | static void netconsole_target_release(struct config_item *item) | |
537 | { | |
538 | kfree(to_target(item)); | |
539 | } | |
540 | ||
541 | static ssize_t netconsole_target_attr_show(struct config_item *item, | |
542 | struct configfs_attribute *attr, | |
543 | char *buf) | |
544 | { | |
545 | ssize_t ret = -EINVAL; | |
546 | struct netconsole_target *nt = to_target(item); | |
547 | struct netconsole_target_attr *na = | |
548 | container_of(attr, struct netconsole_target_attr, attr); | |
549 | ||
550 | if (na->show) | |
551 | ret = na->show(nt, buf); | |
552 | ||
553 | return ret; | |
554 | } | |
555 | ||
556 | static ssize_t netconsole_target_attr_store(struct config_item *item, | |
557 | struct configfs_attribute *attr, | |
558 | const char *buf, | |
559 | size_t count) | |
560 | { | |
561 | ssize_t ret = -EINVAL; | |
562 | struct netconsole_target *nt = to_target(item); | |
563 | struct netconsole_target_attr *na = | |
564 | container_of(attr, struct netconsole_target_attr, attr); | |
565 | ||
566 | if (na->store) | |
567 | ret = na->store(nt, buf, count); | |
568 | ||
569 | return ret; | |
570 | } | |
571 | ||
572 | static struct configfs_item_operations netconsole_target_item_ops = { | |
573 | .release = netconsole_target_release, | |
574 | .show_attribute = netconsole_target_attr_show, | |
575 | .store_attribute = netconsole_target_attr_store, | |
576 | }; | |
577 | ||
578 | static struct config_item_type netconsole_target_type = { | |
579 | .ct_attrs = netconsole_target_attrs, | |
580 | .ct_item_ops = &netconsole_target_item_ops, | |
581 | .ct_owner = THIS_MODULE, | |
582 | }; | |
583 | ||
584 | /* | |
585 | * Group operations and type for netconsole_subsys. | |
586 | */ | |
587 | ||
f89ab861 JB |
588 | static struct config_item *make_netconsole_target(struct config_group *group, |
589 | const char *name) | |
0bcc1816 SS |
590 | { |
591 | unsigned long flags; | |
592 | struct netconsole_target *nt; | |
593 | ||
594 | /* | |
595 | * Allocate and initialize with defaults. | |
596 | * Target is disabled at creation (enabled == 0). | |
597 | */ | |
598 | nt = kzalloc(sizeof(*nt), GFP_KERNEL); | |
e404decb | 599 | if (!nt) |
a6795e9e | 600 | return ERR_PTR(-ENOMEM); |
0bcc1816 SS |
601 | |
602 | nt->np.name = "netconsole"; | |
603 | strlcpy(nt->np.dev_name, "eth0", IFNAMSIZ); | |
604 | nt->np.local_port = 6665; | |
605 | nt->np.remote_port = 6666; | |
7a163bfb | 606 | mutex_init(&nt->mutex); |
0bcc1816 SS |
607 | memset(nt->np.remote_mac, 0xff, ETH_ALEN); |
608 | ||
609 | /* Initialize the config_item member */ | |
610 | config_item_init_type_name(&nt->item, name, &netconsole_target_type); | |
611 | ||
612 | /* Adding, but it is disabled */ | |
613 | spin_lock_irqsave(&target_list_lock, flags); | |
614 | list_add(&nt->list, &target_list); | |
615 | spin_unlock_irqrestore(&target_list_lock, flags); | |
616 | ||
f89ab861 | 617 | return &nt->item; |
0bcc1816 SS |
618 | } |
619 | ||
620 | static void drop_netconsole_target(struct config_group *group, | |
621 | struct config_item *item) | |
622 | { | |
623 | unsigned long flags; | |
624 | struct netconsole_target *nt = to_target(item); | |
625 | ||
626 | spin_lock_irqsave(&target_list_lock, flags); | |
627 | list_del(&nt->list); | |
628 | spin_unlock_irqrestore(&target_list_lock, flags); | |
629 | ||
630 | /* | |
631 | * The target may have never been enabled, or was manually disabled | |
632 | * before being removed so netpoll may have already been cleaned up. | |
633 | */ | |
634 | if (nt->enabled) | |
635 | netpoll_cleanup(&nt->np); | |
636 | ||
637 | config_item_put(&nt->item); | |
638 | } | |
639 | ||
640 | static struct configfs_group_operations netconsole_subsys_group_ops = { | |
641 | .make_item = make_netconsole_target, | |
642 | .drop_item = drop_netconsole_target, | |
643 | }; | |
644 | ||
645 | static struct config_item_type netconsole_subsys_type = { | |
646 | .ct_group_ops = &netconsole_subsys_group_ops, | |
647 | .ct_owner = THIS_MODULE, | |
648 | }; | |
649 | ||
650 | /* The netconsole configfs subsystem */ | |
651 | static struct configfs_subsystem netconsole_subsys = { | |
652 | .su_group = { | |
653 | .cg_item = { | |
654 | .ci_namebuf = "netconsole", | |
655 | .ci_type = &netconsole_subsys_type, | |
656 | }, | |
657 | }, | |
658 | }; | |
659 | ||
660 | #endif /* CONFIG_NETCONSOLE_DYNAMIC */ | |
661 | ||
17951f34 SS |
662 | /* Handle network interface device notifications */ |
663 | static int netconsole_netdev_event(struct notifier_block *this, | |
351638e7 | 664 | unsigned long event, void *ptr) |
17951f34 | 665 | { |
b5427c27 SS |
666 | unsigned long flags; |
667 | struct netconsole_target *nt; | |
351638e7 | 668 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
141dfba3 | 669 | bool stopped = false; |
17951f34 | 670 | |
0e34e931 | 671 | if (!(event == NETDEV_CHANGENAME || event == NETDEV_UNREGISTER || |
daf9209b | 672 | event == NETDEV_RELEASE || event == NETDEV_JOIN)) |
b5427c27 SS |
673 | goto done; |
674 | ||
675 | spin_lock_irqsave(&target_list_lock, flags); | |
3f315bef | 676 | restart: |
b5427c27 | 677 | list_for_each_entry(nt, &target_list, list) { |
0bcc1816 | 678 | netconsole_target_get(nt); |
b5427c27 SS |
679 | if (nt->np.dev == dev) { |
680 | switch (event) { | |
b5427c27 SS |
681 | case NETDEV_CHANGENAME: |
682 | strlcpy(nt->np.dev_name, dev->name, IFNAMSIZ); | |
683 | break; | |
daf9209b | 684 | case NETDEV_RELEASE: |
8d8fc29d | 685 | case NETDEV_JOIN: |
2382b15b | 686 | case NETDEV_UNREGISTER: |
3b410a31 NH |
687 | /* |
688 | * rtnl_lock already held | |
3f315bef | 689 | * we might sleep in __netpoll_cleanup() |
3b410a31 | 690 | */ |
3f315bef | 691 | spin_unlock_irqrestore(&target_list_lock, flags); |
7a163bfb DA |
692 | |
693 | mutex_lock(&nt->mutex); | |
3f315bef | 694 | __netpoll_cleanup(&nt->np); |
7a163bfb DA |
695 | mutex_unlock(&nt->mutex); |
696 | ||
3f315bef VF |
697 | spin_lock_irqsave(&target_list_lock, flags); |
698 | dev_put(nt->np.dev); | |
699 | nt->np.dev = NULL; | |
2382b15b | 700 | nt->enabled = 0; |
141dfba3 | 701 | stopped = true; |
3f315bef VF |
702 | netconsole_target_put(nt); |
703 | goto restart; | |
b5427c27 | 704 | } |
17951f34 | 705 | } |
0bcc1816 | 706 | netconsole_target_put(nt); |
17951f34 | 707 | } |
b5427c27 | 708 | spin_unlock_irqrestore(&target_list_lock, flags); |
8d8fc29d | 709 | if (stopped) { |
38cfb907 | 710 | printk(KERN_INFO "netconsole: network logging stopped on " |
8d8fc29d AW |
711 | "interface %s as it ", dev->name); |
712 | switch (event) { | |
713 | case NETDEV_UNREGISTER: | |
714 | printk(KERN_CONT "unregistered\n"); | |
715 | break; | |
daf9209b | 716 | case NETDEV_RELEASE: |
8d8fc29d AW |
717 | printk(KERN_CONT "released slaves\n"); |
718 | break; | |
719 | case NETDEV_JOIN: | |
720 | printk(KERN_CONT "is joining a master device\n"); | |
721 | break; | |
722 | } | |
723 | } | |
17951f34 | 724 | |
b5427c27 | 725 | done: |
17951f34 SS |
726 | return NOTIFY_DONE; |
727 | } | |
728 | ||
729 | static struct notifier_block netconsole_netdev_notifier = { | |
730 | .notifier_call = netconsole_netdev_event, | |
731 | }; | |
732 | ||
1da177e4 LT |
733 | static void write_msg(struct console *con, const char *msg, unsigned int len) |
734 | { | |
735 | int frag, left; | |
736 | unsigned long flags; | |
b5427c27 SS |
737 | struct netconsole_target *nt; |
738 | const char *tmp; | |
739 | ||
c1a60851 AW |
740 | if (oops_only && !oops_in_progress) |
741 | return; | |
b5427c27 SS |
742 | /* Avoid taking lock and disabling interrupts unnecessarily */ |
743 | if (list_empty(&target_list)) | |
744 | return; | |
745 | ||
746 | spin_lock_irqsave(&target_list_lock, flags); | |
747 | list_for_each_entry(nt, &target_list, list) { | |
0bcc1816 SS |
748 | netconsole_target_get(nt); |
749 | if (nt->enabled && netif_running(nt->np.dev)) { | |
b5427c27 SS |
750 | /* |
751 | * We nest this inside the for-each-target loop above | |
752 | * so that we're able to get as much logging out to | |
753 | * at least one target if we die inside here, instead | |
754 | * of unnecessarily keeping all targets in lock-step. | |
755 | */ | |
756 | tmp = msg; | |
757 | for (left = len; left;) { | |
758 | frag = min(left, MAX_PRINT_CHUNK); | |
759 | netpoll_send_udp(&nt->np, tmp, frag); | |
760 | tmp += frag; | |
761 | left -= frag; | |
762 | } | |
0cc120be | 763 | } |
0bcc1816 | 764 | netconsole_target_put(nt); |
1da177e4 | 765 | } |
b5427c27 | 766 | spin_unlock_irqrestore(&target_list_lock, flags); |
1da177e4 LT |
767 | } |
768 | ||
769 | static struct console netconsole = { | |
d39badf0 | 770 | .name = "netcon", |
0517deed | 771 | .flags = CON_ENABLED, |
d39badf0 | 772 | .write = write_msg, |
1da177e4 LT |
773 | }; |
774 | ||
d39badf0 | 775 | static int __init init_netconsole(void) |
1da177e4 | 776 | { |
0bcc1816 | 777 | int err; |
b5427c27 SS |
778 | struct netconsole_target *nt, *tmp; |
779 | unsigned long flags; | |
780 | char *target_config; | |
781 | char *input = config; | |
b41848b6 | 782 | |
0bcc1816 SS |
783 | if (strnlen(input, MAX_PARAM_LENGTH)) { |
784 | while ((target_config = strsep(&input, ";"))) { | |
785 | nt = alloc_param_target(target_config); | |
786 | if (IS_ERR(nt)) { | |
787 | err = PTR_ERR(nt); | |
788 | goto fail; | |
789 | } | |
0517deed ME |
790 | /* Dump existing printks when we register */ |
791 | netconsole.flags |= CON_PRINTBUFFER; | |
792 | ||
0bcc1816 SS |
793 | spin_lock_irqsave(&target_list_lock, flags); |
794 | list_add(&nt->list, &target_list); | |
795 | spin_unlock_irqrestore(&target_list_lock, flags); | |
b5427c27 | 796 | } |
b5427c27 | 797 | } |
1da177e4 | 798 | |
17951f34 SS |
799 | err = register_netdevice_notifier(&netconsole_netdev_notifier); |
800 | if (err) | |
b5427c27 | 801 | goto fail; |
17951f34 | 802 | |
0bcc1816 SS |
803 | err = dynamic_netconsole_init(); |
804 | if (err) | |
805 | goto undonotifier; | |
806 | ||
1da177e4 LT |
807 | register_console(&netconsole); |
808 | printk(KERN_INFO "netconsole: network logging started\n"); | |
d39badf0 | 809 | |
d39badf0 | 810 | return err; |
b5427c27 | 811 | |
0bcc1816 SS |
812 | undonotifier: |
813 | unregister_netdevice_notifier(&netconsole_netdev_notifier); | |
814 | ||
b5427c27 SS |
815 | fail: |
816 | printk(KERN_ERR "netconsole: cleaning up\n"); | |
817 | ||
818 | /* | |
0bcc1816 SS |
819 | * Remove all targets and destroy them (only targets created |
820 | * from the boot/module option exist here). Skipping the list | |
b5427c27 SS |
821 | * lock is safe here, and netpoll_cleanup() will sleep. |
822 | */ | |
823 | list_for_each_entry_safe(nt, tmp, &target_list, list) { | |
824 | list_del(&nt->list); | |
0bcc1816 | 825 | free_param_target(nt); |
b5427c27 SS |
826 | } |
827 | ||
828 | return err; | |
1da177e4 LT |
829 | } |
830 | ||
d39badf0 | 831 | static void __exit cleanup_netconsole(void) |
1da177e4 | 832 | { |
b5427c27 | 833 | struct netconsole_target *nt, *tmp; |
df180e36 | 834 | |
1da177e4 | 835 | unregister_console(&netconsole); |
0bcc1816 | 836 | dynamic_netconsole_exit(); |
17951f34 | 837 | unregister_netdevice_notifier(&netconsole_netdev_notifier); |
b5427c27 SS |
838 | |
839 | /* | |
0bcc1816 SS |
840 | * Targets created via configfs pin references on our module |
841 | * and would first be rmdir(2)'ed from userspace. We reach | |
842 | * here only when they are already destroyed, and only those | |
843 | * created from the boot/module option are left, so remove and | |
844 | * destroy them. Skipping the list lock is safe here, and | |
845 | * netpoll_cleanup() will sleep. | |
b5427c27 SS |
846 | */ |
847 | list_for_each_entry_safe(nt, tmp, &target_list, list) { | |
848 | list_del(&nt->list); | |
0bcc1816 | 849 | free_param_target(nt); |
b5427c27 | 850 | } |
1da177e4 LT |
851 | } |
852 | ||
97c7de05 LM |
853 | /* |
854 | * Use late_initcall to ensure netconsole is | |
855 | * initialized after network device driver if built-in. | |
856 | * | |
857 | * late_initcall() and module_init() are identical if built as module. | |
858 | */ | |
859 | late_initcall(init_netconsole); | |
1da177e4 | 860 | module_exit(cleanup_netconsole); |