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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 | |
c1a60851 AW |
59 | static bool oops_only = false; |
60 | module_param(oops_only, bool, 0600); | |
61 | MODULE_PARM_DESC(oops_only, "Only log oops messages"); | |
62 | ||
d2b60881 SS |
63 | #ifndef MODULE |
64 | static int __init option_setup(char *opt) | |
65 | { | |
66 | strlcpy(config, opt, MAX_PARAM_LENGTH); | |
67 | return 1; | |
68 | } | |
69 | __setup("netconsole=", option_setup); | |
70 | #endif /* MODULE */ | |
71 | ||
b5427c27 SS |
72 | /* Linked list of all configured targets */ |
73 | static LIST_HEAD(target_list); | |
74 | ||
75 | /* This needs to be a spinlock because write_msg() cannot sleep */ | |
76 | static DEFINE_SPINLOCK(target_list_lock); | |
77 | ||
df180e36 SS |
78 | /** |
79 | * struct netconsole_target - Represents a configured netconsole target. | |
b5427c27 | 80 | * @list: Links this target into the target_list. |
0bcc1816 SS |
81 | * @item: Links us into the configfs subsystem hierarchy. |
82 | * @enabled: On / off knob to enable / disable target. | |
83 | * Visible from userspace (read-write). | |
84 | * We maintain a strict 1:1 correspondence between this and | |
85 | * whether the corresponding netpoll is active or inactive. | |
86 | * Also, other parameters of a target may be modified at | |
87 | * runtime only when it is disabled (enabled == 0). | |
df180e36 | 88 | * @np: The netpoll structure for this target. |
0bcc1816 SS |
89 | * Contains the other userspace visible parameters: |
90 | * dev_name (read-write) | |
91 | * local_port (read-write) | |
92 | * remote_port (read-write) | |
93 | * local_ip (read-write) | |
94 | * remote_ip (read-write) | |
95 | * local_mac (read-only) | |
96 | * remote_mac (read-write) | |
df180e36 SS |
97 | */ |
98 | struct netconsole_target { | |
b5427c27 | 99 | struct list_head list; |
0bcc1816 SS |
100 | #ifdef CONFIG_NETCONSOLE_DYNAMIC |
101 | struct config_item item; | |
102 | #endif | |
103 | int enabled; | |
df180e36 SS |
104 | struct netpoll np; |
105 | }; | |
106 | ||
0bcc1816 SS |
107 | #ifdef CONFIG_NETCONSOLE_DYNAMIC |
108 | ||
109 | static struct configfs_subsystem netconsole_subsys; | |
110 | ||
111 | static int __init dynamic_netconsole_init(void) | |
112 | { | |
113 | config_group_init(&netconsole_subsys.su_group); | |
114 | mutex_init(&netconsole_subsys.su_mutex); | |
115 | return configfs_register_subsystem(&netconsole_subsys); | |
116 | } | |
117 | ||
118 | static void __exit dynamic_netconsole_exit(void) | |
119 | { | |
120 | configfs_unregister_subsystem(&netconsole_subsys); | |
121 | } | |
122 | ||
123 | /* | |
124 | * Targets that were created by parsing the boot/module option string | |
125 | * do not exist in the configfs hierarchy (and have NULL names) and will | |
126 | * never go away, so make these a no-op for them. | |
127 | */ | |
128 | static void netconsole_target_get(struct netconsole_target *nt) | |
129 | { | |
130 | if (config_item_name(&nt->item)) | |
131 | config_item_get(&nt->item); | |
132 | } | |
133 | ||
134 | static void netconsole_target_put(struct netconsole_target *nt) | |
135 | { | |
136 | if (config_item_name(&nt->item)) | |
137 | config_item_put(&nt->item); | |
138 | } | |
139 | ||
140 | #else /* !CONFIG_NETCONSOLE_DYNAMIC */ | |
141 | ||
142 | static int __init dynamic_netconsole_init(void) | |
143 | { | |
144 | return 0; | |
145 | } | |
146 | ||
147 | static void __exit dynamic_netconsole_exit(void) | |
148 | { | |
149 | } | |
150 | ||
151 | /* | |
152 | * No danger of targets going away from under us when dynamic | |
153 | * reconfigurability is off. | |
154 | */ | |
155 | static void netconsole_target_get(struct netconsole_target *nt) | |
156 | { | |
157 | } | |
158 | ||
159 | static void netconsole_target_put(struct netconsole_target *nt) | |
160 | { | |
161 | } | |
162 | ||
163 | #endif /* CONFIG_NETCONSOLE_DYNAMIC */ | |
164 | ||
165 | /* Allocate new target (from boot/module param) and setup netpoll for it */ | |
166 | static struct netconsole_target *alloc_param_target(char *target_config) | |
b5427c27 SS |
167 | { |
168 | int err = -ENOMEM; | |
169 | struct netconsole_target *nt; | |
170 | ||
0bcc1816 SS |
171 | /* |
172 | * Allocate and initialize with defaults. | |
173 | * Note that these targets get their config_item fields zeroed-out. | |
174 | */ | |
b5427c27 | 175 | nt = kzalloc(sizeof(*nt), GFP_KERNEL); |
e404decb | 176 | if (!nt) |
b5427c27 | 177 | goto fail; |
b5427c27 SS |
178 | |
179 | nt->np.name = "netconsole"; | |
180 | strlcpy(nt->np.dev_name, "eth0", IFNAMSIZ); | |
181 | nt->np.local_port = 6665; | |
182 | nt->np.remote_port = 6666; | |
183 | memset(nt->np.remote_mac, 0xff, ETH_ALEN); | |
184 | ||
185 | /* Parse parameters and setup netpoll */ | |
186 | err = netpoll_parse_options(&nt->np, target_config); | |
187 | if (err) | |
188 | goto fail; | |
189 | ||
190 | err = netpoll_setup(&nt->np); | |
191 | if (err) | |
192 | goto fail; | |
193 | ||
0bcc1816 SS |
194 | nt->enabled = 1; |
195 | ||
b5427c27 SS |
196 | return nt; |
197 | ||
198 | fail: | |
199 | kfree(nt); | |
200 | return ERR_PTR(err); | |
201 | } | |
202 | ||
0bcc1816 SS |
203 | /* Cleanup netpoll for given target (from boot/module param) and free it */ |
204 | static void free_param_target(struct netconsole_target *nt) | |
b5427c27 SS |
205 | { |
206 | netpoll_cleanup(&nt->np); | |
207 | kfree(nt); | |
208 | } | |
1da177e4 | 209 | |
0bcc1816 SS |
210 | #ifdef CONFIG_NETCONSOLE_DYNAMIC |
211 | ||
212 | /* | |
213 | * Our subsystem hierarchy is: | |
214 | * | |
215 | * /sys/kernel/config/netconsole/ | |
216 | * | | |
217 | * <target>/ | |
218 | * | enabled | |
219 | * | dev_name | |
220 | * | local_port | |
221 | * | remote_port | |
222 | * | local_ip | |
223 | * | remote_ip | |
224 | * | local_mac | |
225 | * | remote_mac | |
226 | * | | |
227 | * <target>/... | |
228 | */ | |
229 | ||
230 | struct netconsole_target_attr { | |
231 | struct configfs_attribute attr; | |
232 | ssize_t (*show)(struct netconsole_target *nt, | |
233 | char *buf); | |
234 | ssize_t (*store)(struct netconsole_target *nt, | |
235 | const char *buf, | |
236 | size_t count); | |
237 | }; | |
238 | ||
239 | static struct netconsole_target *to_target(struct config_item *item) | |
240 | { | |
241 | return item ? | |
242 | container_of(item, struct netconsole_target, item) : | |
243 | NULL; | |
244 | } | |
245 | ||
0bcc1816 SS |
246 | /* |
247 | * Attribute operations for netconsole_target. | |
248 | */ | |
249 | ||
250 | static ssize_t show_enabled(struct netconsole_target *nt, char *buf) | |
251 | { | |
252 | return snprintf(buf, PAGE_SIZE, "%d\n", nt->enabled); | |
253 | } | |
254 | ||
255 | static ssize_t show_dev_name(struct netconsole_target *nt, char *buf) | |
256 | { | |
257 | return snprintf(buf, PAGE_SIZE, "%s\n", nt->np.dev_name); | |
258 | } | |
259 | ||
260 | static ssize_t show_local_port(struct netconsole_target *nt, char *buf) | |
261 | { | |
262 | return snprintf(buf, PAGE_SIZE, "%d\n", nt->np.local_port); | |
263 | } | |
264 | ||
265 | static ssize_t show_remote_port(struct netconsole_target *nt, char *buf) | |
266 | { | |
267 | return snprintf(buf, PAGE_SIZE, "%d\n", nt->np.remote_port); | |
268 | } | |
269 | ||
270 | static ssize_t show_local_ip(struct netconsole_target *nt, char *buf) | |
271 | { | |
b3d936f3 CW |
272 | if (nt->np.ipv6) |
273 | return snprintf(buf, PAGE_SIZE, "%pI6c\n", &nt->np.local_ip.in6); | |
274 | else | |
b7394d24 | 275 | return snprintf(buf, PAGE_SIZE, "%pI4\n", &nt->np.local_ip); |
0bcc1816 SS |
276 | } |
277 | ||
278 | static ssize_t show_remote_ip(struct netconsole_target *nt, char *buf) | |
279 | { | |
b3d936f3 CW |
280 | if (nt->np.ipv6) |
281 | return snprintf(buf, PAGE_SIZE, "%pI6c\n", &nt->np.remote_ip.in6); | |
282 | else | |
b7394d24 | 283 | return snprintf(buf, PAGE_SIZE, "%pI4\n", &nt->np.remote_ip); |
0bcc1816 SS |
284 | } |
285 | ||
286 | static ssize_t show_local_mac(struct netconsole_target *nt, char *buf) | |
287 | { | |
09538641 | 288 | struct net_device *dev = nt->np.dev; |
e174961c | 289 | static const u8 bcast[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; |
09538641 | 290 | |
e174961c | 291 | return snprintf(buf, PAGE_SIZE, "%pM\n", dev ? dev->dev_addr : bcast); |
0bcc1816 SS |
292 | } |
293 | ||
294 | static ssize_t show_remote_mac(struct netconsole_target *nt, char *buf) | |
295 | { | |
e174961c | 296 | return snprintf(buf, PAGE_SIZE, "%pM\n", nt->np.remote_mac); |
0bcc1816 SS |
297 | } |
298 | ||
299 | /* | |
300 | * This one is special -- targets created through the configfs interface | |
301 | * are not enabled (and the corresponding netpoll activated) by default. | |
302 | * The user is expected to set the desired parameters first (which | |
303 | * would enable him to dynamically add new netpoll targets for new | |
304 | * network interfaces as and when they come up). | |
305 | */ | |
306 | static ssize_t store_enabled(struct netconsole_target *nt, | |
307 | const char *buf, | |
308 | size_t count) | |
309 | { | |
99f823f9 | 310 | int enabled; |
0bcc1816 | 311 | int err; |
0bcc1816 | 312 | |
99f823f9 AD |
313 | err = kstrtoint(buf, 10, &enabled); |
314 | if (err < 0) | |
315 | return err; | |
316 | if (enabled < 0 || enabled > 1) | |
317 | return -EINVAL; | |
d5123480 G |
318 | if (enabled == nt->enabled) { |
319 | printk(KERN_INFO "netconsole: network logging has already %s\n", | |
320 | nt->enabled ? "started" : "stopped"); | |
321 | return -EINVAL; | |
322 | } | |
0bcc1816 SS |
323 | |
324 | if (enabled) { /* 1 */ | |
325 | ||
326 | /* | |
327 | * Skip netpoll_parse_options() -- all the attributes are | |
328 | * already configured via configfs. Just print them out. | |
329 | */ | |
330 | netpoll_print_options(&nt->np); | |
331 | ||
332 | err = netpoll_setup(&nt->np); | |
333 | if (err) | |
334 | return err; | |
335 | ||
336 | printk(KERN_INFO "netconsole: network logging started\n"); | |
337 | ||
338 | } else { /* 0 */ | |
339 | netpoll_cleanup(&nt->np); | |
340 | } | |
341 | ||
342 | nt->enabled = enabled; | |
343 | ||
344 | return strnlen(buf, count); | |
345 | } | |
346 | ||
347 | static ssize_t store_dev_name(struct netconsole_target *nt, | |
348 | const char *buf, | |
349 | size_t count) | |
350 | { | |
351 | size_t len; | |
352 | ||
353 | if (nt->enabled) { | |
354 | printk(KERN_ERR "netconsole: target (%s) is enabled, " | |
355 | "disable to update parameters\n", | |
356 | config_item_name(&nt->item)); | |
357 | return -EINVAL; | |
358 | } | |
359 | ||
360 | strlcpy(nt->np.dev_name, buf, IFNAMSIZ); | |
361 | ||
362 | /* Get rid of possible trailing newline from echo(1) */ | |
363 | len = strnlen(nt->np.dev_name, IFNAMSIZ); | |
364 | if (nt->np.dev_name[len - 1] == '\n') | |
365 | nt->np.dev_name[len - 1] = '\0'; | |
366 | ||
367 | return strnlen(buf, count); | |
368 | } | |
369 | ||
370 | static ssize_t store_local_port(struct netconsole_target *nt, | |
371 | const char *buf, | |
372 | size_t count) | |
373 | { | |
99f823f9 | 374 | int rv; |
0bcc1816 SS |
375 | |
376 | if (nt->enabled) { | |
377 | printk(KERN_ERR "netconsole: target (%s) is enabled, " | |
378 | "disable to update parameters\n", | |
379 | config_item_name(&nt->item)); | |
380 | return -EINVAL; | |
381 | } | |
382 | ||
99f823f9 AD |
383 | rv = kstrtou16(buf, 10, &nt->np.local_port); |
384 | if (rv < 0) | |
385 | return rv; | |
0bcc1816 SS |
386 | return strnlen(buf, count); |
387 | } | |
388 | ||
389 | static ssize_t store_remote_port(struct netconsole_target *nt, | |
390 | const char *buf, | |
391 | size_t count) | |
392 | { | |
99f823f9 | 393 | int rv; |
0bcc1816 SS |
394 | |
395 | if (nt->enabled) { | |
396 | printk(KERN_ERR "netconsole: target (%s) is enabled, " | |
397 | "disable to update parameters\n", | |
398 | config_item_name(&nt->item)); | |
399 | return -EINVAL; | |
400 | } | |
401 | ||
99f823f9 AD |
402 | rv = kstrtou16(buf, 10, &nt->np.remote_port); |
403 | if (rv < 0) | |
404 | return rv; | |
0bcc1816 SS |
405 | return strnlen(buf, count); |
406 | } | |
407 | ||
408 | static ssize_t store_local_ip(struct netconsole_target *nt, | |
409 | const char *buf, | |
410 | size_t count) | |
411 | { | |
412 | if (nt->enabled) { | |
413 | printk(KERN_ERR "netconsole: target (%s) is enabled, " | |
414 | "disable to update parameters\n", | |
415 | config_item_name(&nt->item)); | |
416 | return -EINVAL; | |
417 | } | |
418 | ||
b3d936f3 CW |
419 | if (strnchr(buf, count, ':')) { |
420 | const char *end; | |
421 | if (in6_pton(buf, count, nt->np.local_ip.in6.s6_addr, -1, &end) > 0) { | |
422 | if (*end && *end != '\n') { | |
423 | printk(KERN_ERR "netconsole: invalid IPv6 address at: <%c>\n", *end); | |
424 | return -EINVAL; | |
425 | } | |
426 | nt->np.ipv6 = true; | |
427 | } else | |
428 | return -EINVAL; | |
429 | } else { | |
430 | if (!nt->np.ipv6) { | |
431 | nt->np.local_ip.ip = in_aton(buf); | |
432 | } else | |
433 | return -EINVAL; | |
434 | } | |
0bcc1816 SS |
435 | |
436 | return strnlen(buf, count); | |
437 | } | |
438 | ||
439 | static ssize_t store_remote_ip(struct netconsole_target *nt, | |
440 | const char *buf, | |
441 | size_t count) | |
442 | { | |
443 | if (nt->enabled) { | |
444 | printk(KERN_ERR "netconsole: target (%s) is enabled, " | |
445 | "disable to update parameters\n", | |
446 | config_item_name(&nt->item)); | |
447 | return -EINVAL; | |
448 | } | |
449 | ||
b3d936f3 CW |
450 | if (strnchr(buf, count, ':')) { |
451 | const char *end; | |
452 | if (in6_pton(buf, count, nt->np.remote_ip.in6.s6_addr, -1, &end) > 0) { | |
453 | if (*end && *end != '\n') { | |
454 | printk(KERN_ERR "netconsole: invalid IPv6 address at: <%c>\n", *end); | |
455 | return -EINVAL; | |
456 | } | |
457 | nt->np.ipv6 = true; | |
458 | } else | |
459 | return -EINVAL; | |
460 | } else { | |
461 | if (!nt->np.ipv6) { | |
462 | nt->np.remote_ip.ip = in_aton(buf); | |
463 | } else | |
464 | return -EINVAL; | |
465 | } | |
0bcc1816 SS |
466 | |
467 | return strnlen(buf, count); | |
468 | } | |
469 | ||
470 | static ssize_t store_remote_mac(struct netconsole_target *nt, | |
471 | const char *buf, | |
472 | size_t count) | |
473 | { | |
474 | u8 remote_mac[ETH_ALEN]; | |
0bcc1816 SS |
475 | |
476 | if (nt->enabled) { | |
477 | printk(KERN_ERR "netconsole: target (%s) is enabled, " | |
478 | "disable to update parameters\n", | |
479 | config_item_name(&nt->item)); | |
480 | return -EINVAL; | |
481 | } | |
482 | ||
4940fc88 AD |
483 | if (!mac_pton(buf, remote_mac)) |
484 | return -EINVAL; | |
485 | if (buf[3 * ETH_ALEN - 1] && buf[3 * ETH_ALEN - 1] != '\n') | |
486 | return -EINVAL; | |
0bcc1816 SS |
487 | memcpy(nt->np.remote_mac, remote_mac, ETH_ALEN); |
488 | ||
489 | return strnlen(buf, count); | |
0bcc1816 SS |
490 | } |
491 | ||
492 | /* | |
493 | * Attribute definitions for netconsole_target. | |
494 | */ | |
495 | ||
496 | #define NETCONSOLE_TARGET_ATTR_RO(_name) \ | |
497 | static struct netconsole_target_attr netconsole_target_##_name = \ | |
498 | __CONFIGFS_ATTR(_name, S_IRUGO, show_##_name, NULL) | |
499 | ||
500 | #define NETCONSOLE_TARGET_ATTR_RW(_name) \ | |
501 | static struct netconsole_target_attr netconsole_target_##_name = \ | |
502 | __CONFIGFS_ATTR(_name, S_IRUGO | S_IWUSR, show_##_name, store_##_name) | |
503 | ||
504 | NETCONSOLE_TARGET_ATTR_RW(enabled); | |
505 | NETCONSOLE_TARGET_ATTR_RW(dev_name); | |
506 | NETCONSOLE_TARGET_ATTR_RW(local_port); | |
507 | NETCONSOLE_TARGET_ATTR_RW(remote_port); | |
508 | NETCONSOLE_TARGET_ATTR_RW(local_ip); | |
509 | NETCONSOLE_TARGET_ATTR_RW(remote_ip); | |
510 | NETCONSOLE_TARGET_ATTR_RO(local_mac); | |
511 | NETCONSOLE_TARGET_ATTR_RW(remote_mac); | |
512 | ||
513 | static struct configfs_attribute *netconsole_target_attrs[] = { | |
514 | &netconsole_target_enabled.attr, | |
515 | &netconsole_target_dev_name.attr, | |
516 | &netconsole_target_local_port.attr, | |
517 | &netconsole_target_remote_port.attr, | |
518 | &netconsole_target_local_ip.attr, | |
519 | &netconsole_target_remote_ip.attr, | |
520 | &netconsole_target_local_mac.attr, | |
521 | &netconsole_target_remote_mac.attr, | |
522 | NULL, | |
523 | }; | |
524 | ||
525 | /* | |
526 | * Item operations and type for netconsole_target. | |
527 | */ | |
528 | ||
529 | static void netconsole_target_release(struct config_item *item) | |
530 | { | |
531 | kfree(to_target(item)); | |
532 | } | |
533 | ||
534 | static ssize_t netconsole_target_attr_show(struct config_item *item, | |
535 | struct configfs_attribute *attr, | |
536 | char *buf) | |
537 | { | |
538 | ssize_t ret = -EINVAL; | |
539 | struct netconsole_target *nt = to_target(item); | |
540 | struct netconsole_target_attr *na = | |
541 | container_of(attr, struct netconsole_target_attr, attr); | |
542 | ||
543 | if (na->show) | |
544 | ret = na->show(nt, buf); | |
545 | ||
546 | return ret; | |
547 | } | |
548 | ||
549 | static ssize_t netconsole_target_attr_store(struct config_item *item, | |
550 | struct configfs_attribute *attr, | |
551 | const char *buf, | |
552 | size_t count) | |
553 | { | |
554 | ssize_t ret = -EINVAL; | |
555 | struct netconsole_target *nt = to_target(item); | |
556 | struct netconsole_target_attr *na = | |
557 | container_of(attr, struct netconsole_target_attr, attr); | |
558 | ||
559 | if (na->store) | |
560 | ret = na->store(nt, buf, count); | |
561 | ||
562 | return ret; | |
563 | } | |
564 | ||
565 | static struct configfs_item_operations netconsole_target_item_ops = { | |
566 | .release = netconsole_target_release, | |
567 | .show_attribute = netconsole_target_attr_show, | |
568 | .store_attribute = netconsole_target_attr_store, | |
569 | }; | |
570 | ||
571 | static struct config_item_type netconsole_target_type = { | |
572 | .ct_attrs = netconsole_target_attrs, | |
573 | .ct_item_ops = &netconsole_target_item_ops, | |
574 | .ct_owner = THIS_MODULE, | |
575 | }; | |
576 | ||
577 | /* | |
578 | * Group operations and type for netconsole_subsys. | |
579 | */ | |
580 | ||
f89ab861 JB |
581 | static struct config_item *make_netconsole_target(struct config_group *group, |
582 | const char *name) | |
0bcc1816 SS |
583 | { |
584 | unsigned long flags; | |
585 | struct netconsole_target *nt; | |
586 | ||
587 | /* | |
588 | * Allocate and initialize with defaults. | |
589 | * Target is disabled at creation (enabled == 0). | |
590 | */ | |
591 | nt = kzalloc(sizeof(*nt), GFP_KERNEL); | |
e404decb | 592 | if (!nt) |
a6795e9e | 593 | return ERR_PTR(-ENOMEM); |
0bcc1816 SS |
594 | |
595 | nt->np.name = "netconsole"; | |
596 | strlcpy(nt->np.dev_name, "eth0", IFNAMSIZ); | |
597 | nt->np.local_port = 6665; | |
598 | nt->np.remote_port = 6666; | |
599 | memset(nt->np.remote_mac, 0xff, ETH_ALEN); | |
600 | ||
601 | /* Initialize the config_item member */ | |
602 | config_item_init_type_name(&nt->item, name, &netconsole_target_type); | |
603 | ||
604 | /* Adding, but it is disabled */ | |
605 | spin_lock_irqsave(&target_list_lock, flags); | |
606 | list_add(&nt->list, &target_list); | |
607 | spin_unlock_irqrestore(&target_list_lock, flags); | |
608 | ||
f89ab861 | 609 | return &nt->item; |
0bcc1816 SS |
610 | } |
611 | ||
612 | static void drop_netconsole_target(struct config_group *group, | |
613 | struct config_item *item) | |
614 | { | |
615 | unsigned long flags; | |
616 | struct netconsole_target *nt = to_target(item); | |
617 | ||
618 | spin_lock_irqsave(&target_list_lock, flags); | |
619 | list_del(&nt->list); | |
620 | spin_unlock_irqrestore(&target_list_lock, flags); | |
621 | ||
622 | /* | |
623 | * The target may have never been enabled, or was manually disabled | |
624 | * before being removed so netpoll may have already been cleaned up. | |
625 | */ | |
626 | if (nt->enabled) | |
627 | netpoll_cleanup(&nt->np); | |
628 | ||
629 | config_item_put(&nt->item); | |
630 | } | |
631 | ||
632 | static struct configfs_group_operations netconsole_subsys_group_ops = { | |
633 | .make_item = make_netconsole_target, | |
634 | .drop_item = drop_netconsole_target, | |
635 | }; | |
636 | ||
637 | static struct config_item_type netconsole_subsys_type = { | |
638 | .ct_group_ops = &netconsole_subsys_group_ops, | |
639 | .ct_owner = THIS_MODULE, | |
640 | }; | |
641 | ||
642 | /* The netconsole configfs subsystem */ | |
643 | static struct configfs_subsystem netconsole_subsys = { | |
644 | .su_group = { | |
645 | .cg_item = { | |
646 | .ci_namebuf = "netconsole", | |
647 | .ci_type = &netconsole_subsys_type, | |
648 | }, | |
649 | }, | |
650 | }; | |
651 | ||
652 | #endif /* CONFIG_NETCONSOLE_DYNAMIC */ | |
653 | ||
17951f34 SS |
654 | /* Handle network interface device notifications */ |
655 | static int netconsole_netdev_event(struct notifier_block *this, | |
351638e7 | 656 | unsigned long event, void *ptr) |
17951f34 | 657 | { |
b5427c27 SS |
658 | unsigned long flags; |
659 | struct netconsole_target *nt; | |
351638e7 | 660 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
141dfba3 | 661 | bool stopped = false; |
17951f34 | 662 | |
0e34e931 | 663 | if (!(event == NETDEV_CHANGENAME || event == NETDEV_UNREGISTER || |
daf9209b | 664 | event == NETDEV_RELEASE || event == NETDEV_JOIN)) |
b5427c27 SS |
665 | goto done; |
666 | ||
667 | spin_lock_irqsave(&target_list_lock, flags); | |
3f315bef | 668 | restart: |
b5427c27 | 669 | list_for_each_entry(nt, &target_list, list) { |
0bcc1816 | 670 | netconsole_target_get(nt); |
b5427c27 SS |
671 | if (nt->np.dev == dev) { |
672 | switch (event) { | |
b5427c27 SS |
673 | case NETDEV_CHANGENAME: |
674 | strlcpy(nt->np.dev_name, dev->name, IFNAMSIZ); | |
675 | break; | |
daf9209b | 676 | case NETDEV_RELEASE: |
8d8fc29d | 677 | case NETDEV_JOIN: |
2382b15b | 678 | case NETDEV_UNREGISTER: |
3b410a31 NH |
679 | /* |
680 | * rtnl_lock already held | |
3f315bef | 681 | * we might sleep in __netpoll_cleanup() |
3b410a31 | 682 | */ |
3f315bef VF |
683 | spin_unlock_irqrestore(&target_list_lock, flags); |
684 | __netpoll_cleanup(&nt->np); | |
685 | spin_lock_irqsave(&target_list_lock, flags); | |
686 | dev_put(nt->np.dev); | |
687 | nt->np.dev = NULL; | |
2382b15b | 688 | nt->enabled = 0; |
141dfba3 | 689 | stopped = true; |
3f315bef VF |
690 | netconsole_target_put(nt); |
691 | goto restart; | |
b5427c27 | 692 | } |
17951f34 | 693 | } |
0bcc1816 | 694 | netconsole_target_put(nt); |
17951f34 | 695 | } |
b5427c27 | 696 | spin_unlock_irqrestore(&target_list_lock, flags); |
8d8fc29d | 697 | if (stopped) { |
38cfb907 | 698 | printk(KERN_INFO "netconsole: network logging stopped on " |
8d8fc29d AW |
699 | "interface %s as it ", dev->name); |
700 | switch (event) { | |
701 | case NETDEV_UNREGISTER: | |
702 | printk(KERN_CONT "unregistered\n"); | |
703 | break; | |
daf9209b | 704 | case NETDEV_RELEASE: |
8d8fc29d AW |
705 | printk(KERN_CONT "released slaves\n"); |
706 | break; | |
707 | case NETDEV_JOIN: | |
708 | printk(KERN_CONT "is joining a master device\n"); | |
709 | break; | |
710 | } | |
711 | } | |
17951f34 | 712 | |
b5427c27 | 713 | done: |
17951f34 SS |
714 | return NOTIFY_DONE; |
715 | } | |
716 | ||
717 | static struct notifier_block netconsole_netdev_notifier = { | |
718 | .notifier_call = netconsole_netdev_event, | |
719 | }; | |
720 | ||
1da177e4 LT |
721 | static void write_msg(struct console *con, const char *msg, unsigned int len) |
722 | { | |
723 | int frag, left; | |
724 | unsigned long flags; | |
b5427c27 SS |
725 | struct netconsole_target *nt; |
726 | const char *tmp; | |
727 | ||
c1a60851 AW |
728 | if (oops_only && !oops_in_progress) |
729 | return; | |
b5427c27 SS |
730 | /* Avoid taking lock and disabling interrupts unnecessarily */ |
731 | if (list_empty(&target_list)) | |
732 | return; | |
733 | ||
734 | spin_lock_irqsave(&target_list_lock, flags); | |
735 | list_for_each_entry(nt, &target_list, list) { | |
0bcc1816 SS |
736 | netconsole_target_get(nt); |
737 | if (nt->enabled && netif_running(nt->np.dev)) { | |
b5427c27 SS |
738 | /* |
739 | * We nest this inside the for-each-target loop above | |
740 | * so that we're able to get as much logging out to | |
741 | * at least one target if we die inside here, instead | |
742 | * of unnecessarily keeping all targets in lock-step. | |
743 | */ | |
744 | tmp = msg; | |
745 | for (left = len; left;) { | |
746 | frag = min(left, MAX_PRINT_CHUNK); | |
747 | netpoll_send_udp(&nt->np, tmp, frag); | |
748 | tmp += frag; | |
749 | left -= frag; | |
750 | } | |
0cc120be | 751 | } |
0bcc1816 | 752 | netconsole_target_put(nt); |
1da177e4 | 753 | } |
b5427c27 | 754 | spin_unlock_irqrestore(&target_list_lock, flags); |
1da177e4 LT |
755 | } |
756 | ||
757 | static struct console netconsole = { | |
d39badf0 | 758 | .name = "netcon", |
0517deed | 759 | .flags = CON_ENABLED, |
d39badf0 | 760 | .write = write_msg, |
1da177e4 LT |
761 | }; |
762 | ||
d39badf0 | 763 | static int __init init_netconsole(void) |
1da177e4 | 764 | { |
0bcc1816 | 765 | int err; |
b5427c27 SS |
766 | struct netconsole_target *nt, *tmp; |
767 | unsigned long flags; | |
768 | char *target_config; | |
769 | char *input = config; | |
b41848b6 | 770 | |
0bcc1816 SS |
771 | if (strnlen(input, MAX_PARAM_LENGTH)) { |
772 | while ((target_config = strsep(&input, ";"))) { | |
773 | nt = alloc_param_target(target_config); | |
774 | if (IS_ERR(nt)) { | |
775 | err = PTR_ERR(nt); | |
776 | goto fail; | |
777 | } | |
0517deed ME |
778 | /* Dump existing printks when we register */ |
779 | netconsole.flags |= CON_PRINTBUFFER; | |
780 | ||
0bcc1816 SS |
781 | spin_lock_irqsave(&target_list_lock, flags); |
782 | list_add(&nt->list, &target_list); | |
783 | spin_unlock_irqrestore(&target_list_lock, flags); | |
b5427c27 | 784 | } |
b5427c27 | 785 | } |
1da177e4 | 786 | |
17951f34 SS |
787 | err = register_netdevice_notifier(&netconsole_netdev_notifier); |
788 | if (err) | |
b5427c27 | 789 | goto fail; |
17951f34 | 790 | |
0bcc1816 SS |
791 | err = dynamic_netconsole_init(); |
792 | if (err) | |
793 | goto undonotifier; | |
794 | ||
1da177e4 LT |
795 | register_console(&netconsole); |
796 | printk(KERN_INFO "netconsole: network logging started\n"); | |
d39badf0 | 797 | |
d39badf0 | 798 | return err; |
b5427c27 | 799 | |
0bcc1816 SS |
800 | undonotifier: |
801 | unregister_netdevice_notifier(&netconsole_netdev_notifier); | |
802 | ||
b5427c27 SS |
803 | fail: |
804 | printk(KERN_ERR "netconsole: cleaning up\n"); | |
805 | ||
806 | /* | |
0bcc1816 SS |
807 | * Remove all targets and destroy them (only targets created |
808 | * from the boot/module option exist here). Skipping the list | |
b5427c27 SS |
809 | * lock is safe here, and netpoll_cleanup() will sleep. |
810 | */ | |
811 | list_for_each_entry_safe(nt, tmp, &target_list, list) { | |
812 | list_del(&nt->list); | |
0bcc1816 | 813 | free_param_target(nt); |
b5427c27 SS |
814 | } |
815 | ||
816 | return err; | |
1da177e4 LT |
817 | } |
818 | ||
d39badf0 | 819 | static void __exit cleanup_netconsole(void) |
1da177e4 | 820 | { |
b5427c27 | 821 | struct netconsole_target *nt, *tmp; |
df180e36 | 822 | |
1da177e4 | 823 | unregister_console(&netconsole); |
0bcc1816 | 824 | dynamic_netconsole_exit(); |
17951f34 | 825 | unregister_netdevice_notifier(&netconsole_netdev_notifier); |
b5427c27 SS |
826 | |
827 | /* | |
0bcc1816 SS |
828 | * Targets created via configfs pin references on our module |
829 | * and would first be rmdir(2)'ed from userspace. We reach | |
830 | * here only when they are already destroyed, and only those | |
831 | * created from the boot/module option are left, so remove and | |
832 | * destroy them. Skipping the list lock is safe here, and | |
833 | * netpoll_cleanup() will sleep. | |
b5427c27 SS |
834 | */ |
835 | list_for_each_entry_safe(nt, tmp, &target_list, list) { | |
836 | list_del(&nt->list); | |
0bcc1816 | 837 | free_param_target(nt); |
b5427c27 | 838 | } |
1da177e4 LT |
839 | } |
840 | ||
97c7de05 LM |
841 | /* |
842 | * Use late_initcall to ensure netconsole is | |
843 | * initialized after network device driver if built-in. | |
844 | * | |
845 | * late_initcall() and module_init() are identical if built as module. | |
846 | */ | |
847 | late_initcall(init_netconsole); | |
1da177e4 | 848 | module_exit(cleanup_netconsole); |