Commit | Line | Data |
---|---|---|
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 | { | |
45e526e8 | 313 | unsigned long flags; |
99f823f9 | 314 | int enabled; |
0bcc1816 | 315 | int err; |
0bcc1816 | 316 | |
99f823f9 AD |
317 | err = kstrtoint(buf, 10, &enabled); |
318 | if (err < 0) | |
319 | return err; | |
320 | if (enabled < 0 || enabled > 1) | |
321 | return -EINVAL; | |
d5123480 G |
322 | if (enabled == nt->enabled) { |
323 | printk(KERN_INFO "netconsole: network logging has already %s\n", | |
324 | nt->enabled ? "started" : "stopped"); | |
325 | return -EINVAL; | |
326 | } | |
0bcc1816 SS |
327 | |
328 | if (enabled) { /* 1 */ | |
0bcc1816 SS |
329 | /* |
330 | * Skip netpoll_parse_options() -- all the attributes are | |
331 | * already configured via configfs. Just print them out. | |
332 | */ | |
333 | netpoll_print_options(&nt->np); | |
334 | ||
335 | err = netpoll_setup(&nt->np); | |
c7c6effd | 336 | if (err) |
0bcc1816 SS |
337 | return err; |
338 | ||
339 | printk(KERN_INFO "netconsole: network logging started\n"); | |
0bcc1816 | 340 | } else { /* 0 */ |
45e526e8 NA |
341 | /* We need to disable the netconsole before cleaning it up |
342 | * otherwise we might end up in write_msg() with | |
343 | * nt->np.dev == NULL and nt->enabled == 1 | |
344 | */ | |
345 | spin_lock_irqsave(&target_list_lock, flags); | |
346 | nt->enabled = 0; | |
347 | spin_unlock_irqrestore(&target_list_lock, flags); | |
0bcc1816 SS |
348 | netpoll_cleanup(&nt->np); |
349 | } | |
350 | ||
351 | nt->enabled = enabled; | |
352 | ||
353 | return strnlen(buf, count); | |
354 | } | |
355 | ||
356 | static ssize_t store_dev_name(struct netconsole_target *nt, | |
357 | const char *buf, | |
358 | size_t count) | |
359 | { | |
360 | size_t len; | |
361 | ||
362 | if (nt->enabled) { | |
363 | printk(KERN_ERR "netconsole: target (%s) is enabled, " | |
364 | "disable to update parameters\n", | |
365 | config_item_name(&nt->item)); | |
366 | return -EINVAL; | |
367 | } | |
368 | ||
369 | strlcpy(nt->np.dev_name, buf, IFNAMSIZ); | |
370 | ||
371 | /* Get rid of possible trailing newline from echo(1) */ | |
372 | len = strnlen(nt->np.dev_name, IFNAMSIZ); | |
373 | if (nt->np.dev_name[len - 1] == '\n') | |
374 | nt->np.dev_name[len - 1] = '\0'; | |
375 | ||
376 | return strnlen(buf, count); | |
377 | } | |
378 | ||
379 | static ssize_t store_local_port(struct netconsole_target *nt, | |
380 | const char *buf, | |
381 | size_t count) | |
382 | { | |
99f823f9 | 383 | int rv; |
0bcc1816 SS |
384 | |
385 | if (nt->enabled) { | |
386 | printk(KERN_ERR "netconsole: target (%s) is enabled, " | |
387 | "disable to update parameters\n", | |
388 | config_item_name(&nt->item)); | |
389 | return -EINVAL; | |
390 | } | |
391 | ||
99f823f9 AD |
392 | rv = kstrtou16(buf, 10, &nt->np.local_port); |
393 | if (rv < 0) | |
394 | return rv; | |
0bcc1816 SS |
395 | return strnlen(buf, count); |
396 | } | |
397 | ||
398 | static ssize_t store_remote_port(struct netconsole_target *nt, | |
399 | const char *buf, | |
400 | size_t count) | |
401 | { | |
99f823f9 | 402 | int rv; |
0bcc1816 SS |
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 | ||
99f823f9 AD |
411 | rv = kstrtou16(buf, 10, &nt->np.remote_port); |
412 | if (rv < 0) | |
413 | return rv; | |
0bcc1816 SS |
414 | return strnlen(buf, count); |
415 | } | |
416 | ||
417 | static ssize_t store_local_ip(struct netconsole_target *nt, | |
418 | const char *buf, | |
419 | size_t count) | |
420 | { | |
421 | if (nt->enabled) { | |
422 | printk(KERN_ERR "netconsole: target (%s) is enabled, " | |
423 | "disable to update parameters\n", | |
424 | config_item_name(&nt->item)); | |
425 | return -EINVAL; | |
426 | } | |
427 | ||
b3d936f3 CW |
428 | if (strnchr(buf, count, ':')) { |
429 | const char *end; | |
430 | if (in6_pton(buf, count, nt->np.local_ip.in6.s6_addr, -1, &end) > 0) { | |
431 | if (*end && *end != '\n') { | |
432 | printk(KERN_ERR "netconsole: invalid IPv6 address at: <%c>\n", *end); | |
433 | return -EINVAL; | |
434 | } | |
435 | nt->np.ipv6 = true; | |
436 | } else | |
437 | return -EINVAL; | |
438 | } else { | |
439 | if (!nt->np.ipv6) { | |
440 | nt->np.local_ip.ip = in_aton(buf); | |
441 | } else | |
442 | return -EINVAL; | |
443 | } | |
0bcc1816 SS |
444 | |
445 | return strnlen(buf, count); | |
446 | } | |
447 | ||
448 | static ssize_t store_remote_ip(struct netconsole_target *nt, | |
449 | const char *buf, | |
450 | size_t count) | |
451 | { | |
452 | if (nt->enabled) { | |
453 | printk(KERN_ERR "netconsole: target (%s) is enabled, " | |
454 | "disable to update parameters\n", | |
455 | config_item_name(&nt->item)); | |
456 | return -EINVAL; | |
457 | } | |
458 | ||
b3d936f3 CW |
459 | if (strnchr(buf, count, ':')) { |
460 | const char *end; | |
461 | if (in6_pton(buf, count, nt->np.remote_ip.in6.s6_addr, -1, &end) > 0) { | |
462 | if (*end && *end != '\n') { | |
463 | printk(KERN_ERR "netconsole: invalid IPv6 address at: <%c>\n", *end); | |
464 | return -EINVAL; | |
465 | } | |
466 | nt->np.ipv6 = true; | |
467 | } else | |
468 | return -EINVAL; | |
469 | } else { | |
470 | if (!nt->np.ipv6) { | |
471 | nt->np.remote_ip.ip = in_aton(buf); | |
472 | } else | |
473 | return -EINVAL; | |
474 | } | |
0bcc1816 SS |
475 | |
476 | return strnlen(buf, count); | |
477 | } | |
478 | ||
479 | static ssize_t store_remote_mac(struct netconsole_target *nt, | |
480 | const char *buf, | |
481 | size_t count) | |
482 | { | |
483 | u8 remote_mac[ETH_ALEN]; | |
0bcc1816 SS |
484 | |
485 | if (nt->enabled) { | |
486 | printk(KERN_ERR "netconsole: target (%s) is enabled, " | |
487 | "disable to update parameters\n", | |
488 | config_item_name(&nt->item)); | |
489 | return -EINVAL; | |
490 | } | |
491 | ||
4940fc88 AD |
492 | if (!mac_pton(buf, remote_mac)) |
493 | return -EINVAL; | |
494 | if (buf[3 * ETH_ALEN - 1] && buf[3 * ETH_ALEN - 1] != '\n') | |
495 | return -EINVAL; | |
0bcc1816 SS |
496 | memcpy(nt->np.remote_mac, remote_mac, ETH_ALEN); |
497 | ||
498 | return strnlen(buf, count); | |
0bcc1816 SS |
499 | } |
500 | ||
501 | /* | |
502 | * Attribute definitions for netconsole_target. | |
503 | */ | |
504 | ||
505 | #define NETCONSOLE_TARGET_ATTR_RO(_name) \ | |
506 | static struct netconsole_target_attr netconsole_target_##_name = \ | |
507 | __CONFIGFS_ATTR(_name, S_IRUGO, show_##_name, NULL) | |
508 | ||
509 | #define NETCONSOLE_TARGET_ATTR_RW(_name) \ | |
510 | static struct netconsole_target_attr netconsole_target_##_name = \ | |
511 | __CONFIGFS_ATTR(_name, S_IRUGO | S_IWUSR, show_##_name, store_##_name) | |
512 | ||
513 | NETCONSOLE_TARGET_ATTR_RW(enabled); | |
514 | NETCONSOLE_TARGET_ATTR_RW(dev_name); | |
515 | NETCONSOLE_TARGET_ATTR_RW(local_port); | |
516 | NETCONSOLE_TARGET_ATTR_RW(remote_port); | |
517 | NETCONSOLE_TARGET_ATTR_RW(local_ip); | |
518 | NETCONSOLE_TARGET_ATTR_RW(remote_ip); | |
519 | NETCONSOLE_TARGET_ATTR_RO(local_mac); | |
520 | NETCONSOLE_TARGET_ATTR_RW(remote_mac); | |
521 | ||
522 | static struct configfs_attribute *netconsole_target_attrs[] = { | |
523 | &netconsole_target_enabled.attr, | |
524 | &netconsole_target_dev_name.attr, | |
525 | &netconsole_target_local_port.attr, | |
526 | &netconsole_target_remote_port.attr, | |
527 | &netconsole_target_local_ip.attr, | |
528 | &netconsole_target_remote_ip.attr, | |
529 | &netconsole_target_local_mac.attr, | |
530 | &netconsole_target_remote_mac.attr, | |
531 | NULL, | |
532 | }; | |
533 | ||
534 | /* | |
535 | * Item operations and type for netconsole_target. | |
536 | */ | |
537 | ||
538 | static void netconsole_target_release(struct config_item *item) | |
539 | { | |
540 | kfree(to_target(item)); | |
541 | } | |
542 | ||
543 | static ssize_t netconsole_target_attr_show(struct config_item *item, | |
544 | struct configfs_attribute *attr, | |
545 | char *buf) | |
546 | { | |
547 | ssize_t ret = -EINVAL; | |
548 | struct netconsole_target *nt = to_target(item); | |
549 | struct netconsole_target_attr *na = | |
550 | container_of(attr, struct netconsole_target_attr, attr); | |
551 | ||
552 | if (na->show) | |
553 | ret = na->show(nt, buf); | |
554 | ||
555 | return ret; | |
556 | } | |
557 | ||
558 | static ssize_t netconsole_target_attr_store(struct config_item *item, | |
559 | struct configfs_attribute *attr, | |
560 | const char *buf, | |
561 | size_t count) | |
562 | { | |
563 | ssize_t ret = -EINVAL; | |
564 | struct netconsole_target *nt = to_target(item); | |
565 | struct netconsole_target_attr *na = | |
566 | container_of(attr, struct netconsole_target_attr, attr); | |
567 | ||
c7c6effd | 568 | mutex_lock(&nt->mutex); |
0bcc1816 SS |
569 | if (na->store) |
570 | ret = na->store(nt, buf, count); | |
c7c6effd | 571 | mutex_unlock(&nt->mutex); |
0bcc1816 SS |
572 | |
573 | return ret; | |
574 | } | |
575 | ||
576 | static struct configfs_item_operations netconsole_target_item_ops = { | |
577 | .release = netconsole_target_release, | |
578 | .show_attribute = netconsole_target_attr_show, | |
579 | .store_attribute = netconsole_target_attr_store, | |
580 | }; | |
581 | ||
582 | static struct config_item_type netconsole_target_type = { | |
583 | .ct_attrs = netconsole_target_attrs, | |
584 | .ct_item_ops = &netconsole_target_item_ops, | |
585 | .ct_owner = THIS_MODULE, | |
586 | }; | |
587 | ||
588 | /* | |
589 | * Group operations and type for netconsole_subsys. | |
590 | */ | |
591 | ||
f89ab861 JB |
592 | static struct config_item *make_netconsole_target(struct config_group *group, |
593 | const char *name) | |
0bcc1816 SS |
594 | { |
595 | unsigned long flags; | |
596 | struct netconsole_target *nt; | |
597 | ||
598 | /* | |
599 | * Allocate and initialize with defaults. | |
600 | * Target is disabled at creation (enabled == 0). | |
601 | */ | |
602 | nt = kzalloc(sizeof(*nt), GFP_KERNEL); | |
e404decb | 603 | if (!nt) |
a6795e9e | 604 | return ERR_PTR(-ENOMEM); |
0bcc1816 SS |
605 | |
606 | nt->np.name = "netconsole"; | |
607 | strlcpy(nt->np.dev_name, "eth0", IFNAMSIZ); | |
608 | nt->np.local_port = 6665; | |
609 | nt->np.remote_port = 6666; | |
7a163bfb | 610 | mutex_init(&nt->mutex); |
0bcc1816 SS |
611 | memset(nt->np.remote_mac, 0xff, ETH_ALEN); |
612 | ||
613 | /* Initialize the config_item member */ | |
614 | config_item_init_type_name(&nt->item, name, &netconsole_target_type); | |
615 | ||
616 | /* Adding, but it is disabled */ | |
617 | spin_lock_irqsave(&target_list_lock, flags); | |
618 | list_add(&nt->list, &target_list); | |
619 | spin_unlock_irqrestore(&target_list_lock, flags); | |
620 | ||
f89ab861 | 621 | return &nt->item; |
0bcc1816 SS |
622 | } |
623 | ||
624 | static void drop_netconsole_target(struct config_group *group, | |
625 | struct config_item *item) | |
626 | { | |
627 | unsigned long flags; | |
628 | struct netconsole_target *nt = to_target(item); | |
629 | ||
630 | spin_lock_irqsave(&target_list_lock, flags); | |
631 | list_del(&nt->list); | |
632 | spin_unlock_irqrestore(&target_list_lock, flags); | |
633 | ||
634 | /* | |
635 | * The target may have never been enabled, or was manually disabled | |
636 | * before being removed so netpoll may have already been cleaned up. | |
637 | */ | |
638 | if (nt->enabled) | |
639 | netpoll_cleanup(&nt->np); | |
640 | ||
641 | config_item_put(&nt->item); | |
642 | } | |
643 | ||
644 | static struct configfs_group_operations netconsole_subsys_group_ops = { | |
645 | .make_item = make_netconsole_target, | |
646 | .drop_item = drop_netconsole_target, | |
647 | }; | |
648 | ||
649 | static struct config_item_type netconsole_subsys_type = { | |
650 | .ct_group_ops = &netconsole_subsys_group_ops, | |
651 | .ct_owner = THIS_MODULE, | |
652 | }; | |
653 | ||
654 | /* The netconsole configfs subsystem */ | |
655 | static struct configfs_subsystem netconsole_subsys = { | |
656 | .su_group = { | |
657 | .cg_item = { | |
658 | .ci_namebuf = "netconsole", | |
659 | .ci_type = &netconsole_subsys_type, | |
660 | }, | |
661 | }, | |
662 | }; | |
663 | ||
664 | #endif /* CONFIG_NETCONSOLE_DYNAMIC */ | |
665 | ||
17951f34 SS |
666 | /* Handle network interface device notifications */ |
667 | static int netconsole_netdev_event(struct notifier_block *this, | |
351638e7 | 668 | unsigned long event, void *ptr) |
17951f34 | 669 | { |
b5427c27 SS |
670 | unsigned long flags; |
671 | struct netconsole_target *nt; | |
351638e7 | 672 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
141dfba3 | 673 | bool stopped = false; |
17951f34 | 674 | |
0e34e931 | 675 | if (!(event == NETDEV_CHANGENAME || event == NETDEV_UNREGISTER || |
daf9209b | 676 | event == NETDEV_RELEASE || event == NETDEV_JOIN)) |
b5427c27 SS |
677 | goto done; |
678 | ||
679 | spin_lock_irqsave(&target_list_lock, flags); | |
3f315bef | 680 | restart: |
b5427c27 | 681 | list_for_each_entry(nt, &target_list, list) { |
0bcc1816 | 682 | netconsole_target_get(nt); |
b5427c27 SS |
683 | if (nt->np.dev == dev) { |
684 | switch (event) { | |
b5427c27 SS |
685 | case NETDEV_CHANGENAME: |
686 | strlcpy(nt->np.dev_name, dev->name, IFNAMSIZ); | |
687 | break; | |
daf9209b | 688 | case NETDEV_RELEASE: |
8d8fc29d | 689 | case NETDEV_JOIN: |
2382b15b | 690 | case NETDEV_UNREGISTER: |
c71380ff | 691 | /* rtnl_lock already held |
3f315bef | 692 | * we might sleep in __netpoll_cleanup() |
3b410a31 | 693 | */ |
3f315bef | 694 | spin_unlock_irqrestore(&target_list_lock, flags); |
7a163bfb | 695 | |
3f315bef | 696 | __netpoll_cleanup(&nt->np); |
7a163bfb | 697 | |
3f315bef VF |
698 | spin_lock_irqsave(&target_list_lock, flags); |
699 | dev_put(nt->np.dev); | |
700 | nt->np.dev = NULL; | |
2382b15b | 701 | nt->enabled = 0; |
141dfba3 | 702 | stopped = true; |
3f315bef VF |
703 | netconsole_target_put(nt); |
704 | goto restart; | |
b5427c27 | 705 | } |
17951f34 | 706 | } |
0bcc1816 | 707 | netconsole_target_put(nt); |
17951f34 | 708 | } |
b5427c27 | 709 | spin_unlock_irqrestore(&target_list_lock, flags); |
8d8fc29d | 710 | if (stopped) { |
38cfb907 | 711 | printk(KERN_INFO "netconsole: network logging stopped on " |
8d8fc29d AW |
712 | "interface %s as it ", dev->name); |
713 | switch (event) { | |
714 | case NETDEV_UNREGISTER: | |
715 | printk(KERN_CONT "unregistered\n"); | |
716 | break; | |
daf9209b | 717 | case NETDEV_RELEASE: |
8d8fc29d AW |
718 | printk(KERN_CONT "released slaves\n"); |
719 | break; | |
720 | case NETDEV_JOIN: | |
721 | printk(KERN_CONT "is joining a master device\n"); | |
722 | break; | |
723 | } | |
724 | } | |
17951f34 | 725 | |
b5427c27 | 726 | done: |
17951f34 SS |
727 | return NOTIFY_DONE; |
728 | } | |
729 | ||
730 | static struct notifier_block netconsole_netdev_notifier = { | |
731 | .notifier_call = netconsole_netdev_event, | |
732 | }; | |
733 | ||
1da177e4 LT |
734 | static void write_msg(struct console *con, const char *msg, unsigned int len) |
735 | { | |
736 | int frag, left; | |
737 | unsigned long flags; | |
b5427c27 SS |
738 | struct netconsole_target *nt; |
739 | const char *tmp; | |
740 | ||
c1a60851 AW |
741 | if (oops_only && !oops_in_progress) |
742 | return; | |
b5427c27 SS |
743 | /* Avoid taking lock and disabling interrupts unnecessarily */ |
744 | if (list_empty(&target_list)) | |
745 | return; | |
746 | ||
747 | spin_lock_irqsave(&target_list_lock, flags); | |
748 | list_for_each_entry(nt, &target_list, list) { | |
0bcc1816 SS |
749 | netconsole_target_get(nt); |
750 | if (nt->enabled && netif_running(nt->np.dev)) { | |
b5427c27 SS |
751 | /* |
752 | * We nest this inside the for-each-target loop above | |
753 | * so that we're able to get as much logging out to | |
754 | * at least one target if we die inside here, instead | |
755 | * of unnecessarily keeping all targets in lock-step. | |
756 | */ | |
757 | tmp = msg; | |
758 | for (left = len; left;) { | |
759 | frag = min(left, MAX_PRINT_CHUNK); | |
760 | netpoll_send_udp(&nt->np, tmp, frag); | |
761 | tmp += frag; | |
762 | left -= frag; | |
763 | } | |
0cc120be | 764 | } |
0bcc1816 | 765 | netconsole_target_put(nt); |
1da177e4 | 766 | } |
b5427c27 | 767 | spin_unlock_irqrestore(&target_list_lock, flags); |
1da177e4 LT |
768 | } |
769 | ||
770 | static struct console netconsole = { | |
d39badf0 | 771 | .name = "netcon", |
0517deed | 772 | .flags = CON_ENABLED, |
d39badf0 | 773 | .write = write_msg, |
1da177e4 LT |
774 | }; |
775 | ||
d39badf0 | 776 | static int __init init_netconsole(void) |
1da177e4 | 777 | { |
0bcc1816 | 778 | int err; |
b5427c27 SS |
779 | struct netconsole_target *nt, *tmp; |
780 | unsigned long flags; | |
781 | char *target_config; | |
782 | char *input = config; | |
b41848b6 | 783 | |
0bcc1816 SS |
784 | if (strnlen(input, MAX_PARAM_LENGTH)) { |
785 | while ((target_config = strsep(&input, ";"))) { | |
786 | nt = alloc_param_target(target_config); | |
787 | if (IS_ERR(nt)) { | |
788 | err = PTR_ERR(nt); | |
789 | goto fail; | |
790 | } | |
0517deed ME |
791 | /* Dump existing printks when we register */ |
792 | netconsole.flags |= CON_PRINTBUFFER; | |
793 | ||
0bcc1816 SS |
794 | spin_lock_irqsave(&target_list_lock, flags); |
795 | list_add(&nt->list, &target_list); | |
796 | spin_unlock_irqrestore(&target_list_lock, flags); | |
b5427c27 | 797 | } |
b5427c27 | 798 | } |
1da177e4 | 799 | |
17951f34 SS |
800 | err = register_netdevice_notifier(&netconsole_netdev_notifier); |
801 | if (err) | |
b5427c27 | 802 | goto fail; |
17951f34 | 803 | |
0bcc1816 SS |
804 | err = dynamic_netconsole_init(); |
805 | if (err) | |
806 | goto undonotifier; | |
807 | ||
1da177e4 LT |
808 | register_console(&netconsole); |
809 | printk(KERN_INFO "netconsole: network logging started\n"); | |
d39badf0 | 810 | |
d39badf0 | 811 | return err; |
b5427c27 | 812 | |
0bcc1816 SS |
813 | undonotifier: |
814 | unregister_netdevice_notifier(&netconsole_netdev_notifier); | |
815 | ||
b5427c27 SS |
816 | fail: |
817 | printk(KERN_ERR "netconsole: cleaning up\n"); | |
818 | ||
819 | /* | |
0bcc1816 SS |
820 | * Remove all targets and destroy them (only targets created |
821 | * from the boot/module option exist here). Skipping the list | |
b5427c27 SS |
822 | * lock is safe here, and netpoll_cleanup() will sleep. |
823 | */ | |
824 | list_for_each_entry_safe(nt, tmp, &target_list, list) { | |
825 | list_del(&nt->list); | |
0bcc1816 | 826 | free_param_target(nt); |
b5427c27 SS |
827 | } |
828 | ||
829 | return err; | |
1da177e4 LT |
830 | } |
831 | ||
d39badf0 | 832 | static void __exit cleanup_netconsole(void) |
1da177e4 | 833 | { |
b5427c27 | 834 | struct netconsole_target *nt, *tmp; |
df180e36 | 835 | |
1da177e4 | 836 | unregister_console(&netconsole); |
0bcc1816 | 837 | dynamic_netconsole_exit(); |
17951f34 | 838 | unregister_netdevice_notifier(&netconsole_netdev_notifier); |
b5427c27 SS |
839 | |
840 | /* | |
0bcc1816 SS |
841 | * Targets created via configfs pin references on our module |
842 | * and would first be rmdir(2)'ed from userspace. We reach | |
843 | * here only when they are already destroyed, and only those | |
844 | * created from the boot/module option are left, so remove and | |
845 | * destroy them. Skipping the list lock is safe here, and | |
846 | * netpoll_cleanup() will sleep. | |
b5427c27 SS |
847 | */ |
848 | list_for_each_entry_safe(nt, tmp, &target_list, list) { | |
849 | list_del(&nt->list); | |
0bcc1816 | 850 | free_param_target(nt); |
b5427c27 | 851 | } |
1da177e4 LT |
852 | } |
853 | ||
97c7de05 LM |
854 | /* |
855 | * Use late_initcall to ensure netconsole is | |
856 | * initialized after network device driver if built-in. | |
857 | * | |
858 | * late_initcall() and module_init() are identical if built as module. | |
859 | */ | |
860 | late_initcall(init_netconsole); | |
1da177e4 | 861 | module_exit(cleanup_netconsole); |