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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; | |
df180e36 SS |
105 | struct netpoll np; |
106 | }; | |
107 | ||
0bcc1816 SS |
108 | #ifdef CONFIG_NETCONSOLE_DYNAMIC |
109 | ||
110 | static struct configfs_subsystem netconsole_subsys; | |
111 | ||
112 | static int __init dynamic_netconsole_init(void) | |
113 | { | |
114 | config_group_init(&netconsole_subsys.su_group); | |
115 | mutex_init(&netconsole_subsys.su_mutex); | |
116 | return configfs_register_subsystem(&netconsole_subsys); | |
117 | } | |
118 | ||
119 | static void __exit dynamic_netconsole_exit(void) | |
120 | { | |
121 | configfs_unregister_subsystem(&netconsole_subsys); | |
122 | } | |
123 | ||
124 | /* | |
125 | * Targets that were created by parsing the boot/module option string | |
126 | * do not exist in the configfs hierarchy (and have NULL names) and will | |
127 | * never go away, so make these a no-op for them. | |
128 | */ | |
129 | static void netconsole_target_get(struct netconsole_target *nt) | |
130 | { | |
131 | if (config_item_name(&nt->item)) | |
132 | config_item_get(&nt->item); | |
133 | } | |
134 | ||
135 | static void netconsole_target_put(struct netconsole_target *nt) | |
136 | { | |
137 | if (config_item_name(&nt->item)) | |
138 | config_item_put(&nt->item); | |
139 | } | |
140 | ||
141 | #else /* !CONFIG_NETCONSOLE_DYNAMIC */ | |
142 | ||
143 | static int __init dynamic_netconsole_init(void) | |
144 | { | |
145 | return 0; | |
146 | } | |
147 | ||
148 | static void __exit dynamic_netconsole_exit(void) | |
149 | { | |
150 | } | |
151 | ||
152 | /* | |
153 | * No danger of targets going away from under us when dynamic | |
154 | * reconfigurability is off. | |
155 | */ | |
156 | static void netconsole_target_get(struct netconsole_target *nt) | |
157 | { | |
158 | } | |
159 | ||
160 | static void netconsole_target_put(struct netconsole_target *nt) | |
161 | { | |
162 | } | |
163 | ||
164 | #endif /* CONFIG_NETCONSOLE_DYNAMIC */ | |
165 | ||
166 | /* Allocate new target (from boot/module param) and setup netpoll for it */ | |
167 | static struct netconsole_target *alloc_param_target(char *target_config) | |
b5427c27 SS |
168 | { |
169 | int err = -ENOMEM; | |
170 | struct netconsole_target *nt; | |
171 | ||
0bcc1816 SS |
172 | /* |
173 | * Allocate and initialize with defaults. | |
174 | * Note that these targets get their config_item fields zeroed-out. | |
175 | */ | |
b5427c27 | 176 | nt = kzalloc(sizeof(*nt), GFP_KERNEL); |
e404decb | 177 | if (!nt) |
b5427c27 | 178 | goto fail; |
b5427c27 SS |
179 | |
180 | nt->np.name = "netconsole"; | |
181 | strlcpy(nt->np.dev_name, "eth0", IFNAMSIZ); | |
182 | nt->np.local_port = 6665; | |
183 | nt->np.remote_port = 6666; | |
184 | memset(nt->np.remote_mac, 0xff, ETH_ALEN); | |
185 | ||
186 | /* Parse parameters and setup netpoll */ | |
187 | err = netpoll_parse_options(&nt->np, target_config); | |
188 | if (err) | |
189 | goto fail; | |
190 | ||
191 | err = netpoll_setup(&nt->np); | |
192 | if (err) | |
193 | goto fail; | |
194 | ||
0bcc1816 SS |
195 | nt->enabled = 1; |
196 | ||
b5427c27 SS |
197 | return nt; |
198 | ||
199 | fail: | |
200 | kfree(nt); | |
201 | return ERR_PTR(err); | |
202 | } | |
203 | ||
0bcc1816 SS |
204 | /* Cleanup netpoll for given target (from boot/module param) and free it */ |
205 | static void free_param_target(struct netconsole_target *nt) | |
b5427c27 SS |
206 | { |
207 | netpoll_cleanup(&nt->np); | |
208 | kfree(nt); | |
209 | } | |
1da177e4 | 210 | |
0bcc1816 SS |
211 | #ifdef CONFIG_NETCONSOLE_DYNAMIC |
212 | ||
213 | /* | |
214 | * Our subsystem hierarchy is: | |
215 | * | |
216 | * /sys/kernel/config/netconsole/ | |
217 | * | | |
218 | * <target>/ | |
219 | * | enabled | |
220 | * | dev_name | |
221 | * | local_port | |
222 | * | remote_port | |
223 | * | local_ip | |
224 | * | remote_ip | |
225 | * | local_mac | |
226 | * | remote_mac | |
227 | * | | |
228 | * <target>/... | |
229 | */ | |
230 | ||
231 | struct netconsole_target_attr { | |
232 | struct configfs_attribute attr; | |
233 | ssize_t (*show)(struct netconsole_target *nt, | |
234 | char *buf); | |
235 | ssize_t (*store)(struct netconsole_target *nt, | |
236 | const char *buf, | |
237 | size_t count); | |
238 | }; | |
239 | ||
240 | static struct netconsole_target *to_target(struct config_item *item) | |
241 | { | |
242 | return item ? | |
243 | container_of(item, struct netconsole_target, item) : | |
244 | NULL; | |
245 | } | |
246 | ||
0bcc1816 SS |
247 | /* |
248 | * Attribute operations for netconsole_target. | |
249 | */ | |
250 | ||
251 | static ssize_t show_enabled(struct netconsole_target *nt, char *buf) | |
252 | { | |
253 | return snprintf(buf, PAGE_SIZE, "%d\n", nt->enabled); | |
254 | } | |
255 | ||
256 | static ssize_t show_dev_name(struct netconsole_target *nt, char *buf) | |
257 | { | |
258 | return snprintf(buf, PAGE_SIZE, "%s\n", nt->np.dev_name); | |
259 | } | |
260 | ||
261 | static ssize_t show_local_port(struct netconsole_target *nt, char *buf) | |
262 | { | |
263 | return snprintf(buf, PAGE_SIZE, "%d\n", nt->np.local_port); | |
264 | } | |
265 | ||
266 | static ssize_t show_remote_port(struct netconsole_target *nt, char *buf) | |
267 | { | |
268 | return snprintf(buf, PAGE_SIZE, "%d\n", nt->np.remote_port); | |
269 | } | |
270 | ||
271 | static ssize_t show_local_ip(struct netconsole_target *nt, char *buf) | |
272 | { | |
b3d936f3 CW |
273 | if (nt->np.ipv6) |
274 | return snprintf(buf, PAGE_SIZE, "%pI6c\n", &nt->np.local_ip.in6); | |
275 | else | |
b7394d24 | 276 | return snprintf(buf, PAGE_SIZE, "%pI4\n", &nt->np.local_ip); |
0bcc1816 SS |
277 | } |
278 | ||
279 | static ssize_t show_remote_ip(struct netconsole_target *nt, char *buf) | |
280 | { | |
b3d936f3 CW |
281 | if (nt->np.ipv6) |
282 | return snprintf(buf, PAGE_SIZE, "%pI6c\n", &nt->np.remote_ip.in6); | |
283 | else | |
b7394d24 | 284 | return snprintf(buf, PAGE_SIZE, "%pI4\n", &nt->np.remote_ip); |
0bcc1816 SS |
285 | } |
286 | ||
287 | static ssize_t show_local_mac(struct netconsole_target *nt, char *buf) | |
288 | { | |
09538641 | 289 | struct net_device *dev = nt->np.dev; |
e174961c | 290 | static const u8 bcast[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; |
09538641 | 291 | |
e174961c | 292 | return snprintf(buf, PAGE_SIZE, "%pM\n", dev ? dev->dev_addr : bcast); |
0bcc1816 SS |
293 | } |
294 | ||
295 | static ssize_t show_remote_mac(struct netconsole_target *nt, char *buf) | |
296 | { | |
e174961c | 297 | return snprintf(buf, PAGE_SIZE, "%pM\n", nt->np.remote_mac); |
0bcc1816 SS |
298 | } |
299 | ||
300 | /* | |
301 | * This one is special -- targets created through the configfs interface | |
302 | * are not enabled (and the corresponding netpoll activated) by default. | |
303 | * The user is expected to set the desired parameters first (which | |
304 | * would enable him to dynamically add new netpoll targets for new | |
305 | * network interfaces as and when they come up). | |
306 | */ | |
307 | static ssize_t store_enabled(struct netconsole_target *nt, | |
308 | const char *buf, | |
309 | size_t count) | |
310 | { | |
99f823f9 | 311 | int enabled; |
0bcc1816 | 312 | int err; |
0bcc1816 | 313 | |
99f823f9 AD |
314 | err = kstrtoint(buf, 10, &enabled); |
315 | if (err < 0) | |
316 | return err; | |
317 | if (enabled < 0 || enabled > 1) | |
318 | return -EINVAL; | |
d5123480 G |
319 | if (enabled == nt->enabled) { |
320 | printk(KERN_INFO "netconsole: network logging has already %s\n", | |
321 | nt->enabled ? "started" : "stopped"); | |
322 | return -EINVAL; | |
323 | } | |
0bcc1816 SS |
324 | |
325 | if (enabled) { /* 1 */ | |
326 | ||
327 | /* | |
328 | * Skip netpoll_parse_options() -- all the attributes are | |
329 | * already configured via configfs. Just print them out. | |
330 | */ | |
331 | netpoll_print_options(&nt->np); | |
332 | ||
333 | err = netpoll_setup(&nt->np); | |
334 | if (err) | |
335 | return err; | |
336 | ||
337 | printk(KERN_INFO "netconsole: network logging started\n"); | |
338 | ||
339 | } else { /* 0 */ | |
340 | netpoll_cleanup(&nt->np); | |
341 | } | |
342 | ||
343 | nt->enabled = enabled; | |
344 | ||
345 | return strnlen(buf, count); | |
346 | } | |
347 | ||
348 | static ssize_t store_dev_name(struct netconsole_target *nt, | |
349 | const char *buf, | |
350 | size_t count) | |
351 | { | |
352 | size_t len; | |
353 | ||
354 | if (nt->enabled) { | |
355 | printk(KERN_ERR "netconsole: target (%s) is enabled, " | |
356 | "disable to update parameters\n", | |
357 | config_item_name(&nt->item)); | |
358 | return -EINVAL; | |
359 | } | |
360 | ||
361 | strlcpy(nt->np.dev_name, buf, IFNAMSIZ); | |
362 | ||
363 | /* Get rid of possible trailing newline from echo(1) */ | |
364 | len = strnlen(nt->np.dev_name, IFNAMSIZ); | |
365 | if (nt->np.dev_name[len - 1] == '\n') | |
366 | nt->np.dev_name[len - 1] = '\0'; | |
367 | ||
368 | return strnlen(buf, count); | |
369 | } | |
370 | ||
371 | static ssize_t store_local_port(struct netconsole_target *nt, | |
372 | const char *buf, | |
373 | size_t count) | |
374 | { | |
99f823f9 | 375 | int rv; |
0bcc1816 SS |
376 | |
377 | if (nt->enabled) { | |
378 | printk(KERN_ERR "netconsole: target (%s) is enabled, " | |
379 | "disable to update parameters\n", | |
380 | config_item_name(&nt->item)); | |
381 | return -EINVAL; | |
382 | } | |
383 | ||
99f823f9 AD |
384 | rv = kstrtou16(buf, 10, &nt->np.local_port); |
385 | if (rv < 0) | |
386 | return rv; | |
0bcc1816 SS |
387 | return strnlen(buf, count); |
388 | } | |
389 | ||
390 | static ssize_t store_remote_port(struct netconsole_target *nt, | |
391 | const char *buf, | |
392 | size_t count) | |
393 | { | |
99f823f9 | 394 | int rv; |
0bcc1816 SS |
395 | |
396 | if (nt->enabled) { | |
397 | printk(KERN_ERR "netconsole: target (%s) is enabled, " | |
398 | "disable to update parameters\n", | |
399 | config_item_name(&nt->item)); | |
400 | return -EINVAL; | |
401 | } | |
402 | ||
99f823f9 AD |
403 | rv = kstrtou16(buf, 10, &nt->np.remote_port); |
404 | if (rv < 0) | |
405 | return rv; | |
0bcc1816 SS |
406 | return strnlen(buf, count); |
407 | } | |
408 | ||
409 | static ssize_t store_local_ip(struct netconsole_target *nt, | |
410 | const char *buf, | |
411 | size_t count) | |
412 | { | |
413 | if (nt->enabled) { | |
414 | printk(KERN_ERR "netconsole: target (%s) is enabled, " | |
415 | "disable to update parameters\n", | |
416 | config_item_name(&nt->item)); | |
417 | return -EINVAL; | |
418 | } | |
419 | ||
b3d936f3 CW |
420 | if (strnchr(buf, count, ':')) { |
421 | const char *end; | |
422 | if (in6_pton(buf, count, nt->np.local_ip.in6.s6_addr, -1, &end) > 0) { | |
423 | if (*end && *end != '\n') { | |
424 | printk(KERN_ERR "netconsole: invalid IPv6 address at: <%c>\n", *end); | |
425 | return -EINVAL; | |
426 | } | |
427 | nt->np.ipv6 = true; | |
428 | } else | |
429 | return -EINVAL; | |
430 | } else { | |
431 | if (!nt->np.ipv6) { | |
432 | nt->np.local_ip.ip = in_aton(buf); | |
433 | } else | |
434 | return -EINVAL; | |
435 | } | |
0bcc1816 SS |
436 | |
437 | return strnlen(buf, count); | |
438 | } | |
439 | ||
440 | static ssize_t store_remote_ip(struct netconsole_target *nt, | |
441 | const char *buf, | |
442 | size_t count) | |
443 | { | |
444 | if (nt->enabled) { | |
445 | printk(KERN_ERR "netconsole: target (%s) is enabled, " | |
446 | "disable to update parameters\n", | |
447 | config_item_name(&nt->item)); | |
448 | return -EINVAL; | |
449 | } | |
450 | ||
b3d936f3 CW |
451 | if (strnchr(buf, count, ':')) { |
452 | const char *end; | |
453 | if (in6_pton(buf, count, nt->np.remote_ip.in6.s6_addr, -1, &end) > 0) { | |
454 | if (*end && *end != '\n') { | |
455 | printk(KERN_ERR "netconsole: invalid IPv6 address at: <%c>\n", *end); | |
456 | return -EINVAL; | |
457 | } | |
458 | nt->np.ipv6 = true; | |
459 | } else | |
460 | return -EINVAL; | |
461 | } else { | |
462 | if (!nt->np.ipv6) { | |
463 | nt->np.remote_ip.ip = in_aton(buf); | |
464 | } else | |
465 | return -EINVAL; | |
466 | } | |
0bcc1816 SS |
467 | |
468 | return strnlen(buf, count); | |
469 | } | |
470 | ||
471 | static ssize_t store_remote_mac(struct netconsole_target *nt, | |
472 | const char *buf, | |
473 | size_t count) | |
474 | { | |
475 | u8 remote_mac[ETH_ALEN]; | |
0bcc1816 SS |
476 | |
477 | if (nt->enabled) { | |
478 | printk(KERN_ERR "netconsole: target (%s) is enabled, " | |
479 | "disable to update parameters\n", | |
480 | config_item_name(&nt->item)); | |
481 | return -EINVAL; | |
482 | } | |
483 | ||
4940fc88 AD |
484 | if (!mac_pton(buf, remote_mac)) |
485 | return -EINVAL; | |
486 | if (buf[3 * ETH_ALEN - 1] && buf[3 * ETH_ALEN - 1] != '\n') | |
487 | return -EINVAL; | |
0bcc1816 SS |
488 | memcpy(nt->np.remote_mac, remote_mac, ETH_ALEN); |
489 | ||
490 | return strnlen(buf, count); | |
0bcc1816 SS |
491 | } |
492 | ||
493 | /* | |
494 | * Attribute definitions for netconsole_target. | |
495 | */ | |
496 | ||
497 | #define NETCONSOLE_TARGET_ATTR_RO(_name) \ | |
498 | static struct netconsole_target_attr netconsole_target_##_name = \ | |
499 | __CONFIGFS_ATTR(_name, S_IRUGO, show_##_name, NULL) | |
500 | ||
501 | #define NETCONSOLE_TARGET_ATTR_RW(_name) \ | |
502 | static struct netconsole_target_attr netconsole_target_##_name = \ | |
503 | __CONFIGFS_ATTR(_name, S_IRUGO | S_IWUSR, show_##_name, store_##_name) | |
504 | ||
505 | NETCONSOLE_TARGET_ATTR_RW(enabled); | |
506 | NETCONSOLE_TARGET_ATTR_RW(dev_name); | |
507 | NETCONSOLE_TARGET_ATTR_RW(local_port); | |
508 | NETCONSOLE_TARGET_ATTR_RW(remote_port); | |
509 | NETCONSOLE_TARGET_ATTR_RW(local_ip); | |
510 | NETCONSOLE_TARGET_ATTR_RW(remote_ip); | |
511 | NETCONSOLE_TARGET_ATTR_RO(local_mac); | |
512 | NETCONSOLE_TARGET_ATTR_RW(remote_mac); | |
513 | ||
514 | static struct configfs_attribute *netconsole_target_attrs[] = { | |
515 | &netconsole_target_enabled.attr, | |
516 | &netconsole_target_dev_name.attr, | |
517 | &netconsole_target_local_port.attr, | |
518 | &netconsole_target_remote_port.attr, | |
519 | &netconsole_target_local_ip.attr, | |
520 | &netconsole_target_remote_ip.attr, | |
521 | &netconsole_target_local_mac.attr, | |
522 | &netconsole_target_remote_mac.attr, | |
523 | NULL, | |
524 | }; | |
525 | ||
526 | /* | |
527 | * Item operations and type for netconsole_target. | |
528 | */ | |
529 | ||
530 | static void netconsole_target_release(struct config_item *item) | |
531 | { | |
532 | kfree(to_target(item)); | |
533 | } | |
534 | ||
535 | static ssize_t netconsole_target_attr_show(struct config_item *item, | |
536 | struct configfs_attribute *attr, | |
537 | char *buf) | |
538 | { | |
539 | ssize_t ret = -EINVAL; | |
540 | struct netconsole_target *nt = to_target(item); | |
541 | struct netconsole_target_attr *na = | |
542 | container_of(attr, struct netconsole_target_attr, attr); | |
543 | ||
544 | if (na->show) | |
545 | ret = na->show(nt, buf); | |
546 | ||
547 | return ret; | |
548 | } | |
549 | ||
550 | static ssize_t netconsole_target_attr_store(struct config_item *item, | |
551 | struct configfs_attribute *attr, | |
552 | const char *buf, | |
553 | size_t count) | |
554 | { | |
555 | ssize_t ret = -EINVAL; | |
556 | struct netconsole_target *nt = to_target(item); | |
557 | struct netconsole_target_attr *na = | |
558 | container_of(attr, struct netconsole_target_attr, attr); | |
559 | ||
560 | if (na->store) | |
561 | ret = na->store(nt, buf, count); | |
562 | ||
563 | return ret; | |
564 | } | |
565 | ||
566 | static struct configfs_item_operations netconsole_target_item_ops = { | |
567 | .release = netconsole_target_release, | |
568 | .show_attribute = netconsole_target_attr_show, | |
569 | .store_attribute = netconsole_target_attr_store, | |
570 | }; | |
571 | ||
572 | static struct config_item_type netconsole_target_type = { | |
573 | .ct_attrs = netconsole_target_attrs, | |
574 | .ct_item_ops = &netconsole_target_item_ops, | |
575 | .ct_owner = THIS_MODULE, | |
576 | }; | |
577 | ||
578 | /* | |
579 | * Group operations and type for netconsole_subsys. | |
580 | */ | |
581 | ||
f89ab861 JB |
582 | static struct config_item *make_netconsole_target(struct config_group *group, |
583 | const char *name) | |
0bcc1816 SS |
584 | { |
585 | unsigned long flags; | |
586 | struct netconsole_target *nt; | |
587 | ||
588 | /* | |
589 | * Allocate and initialize with defaults. | |
590 | * Target is disabled at creation (enabled == 0). | |
591 | */ | |
592 | nt = kzalloc(sizeof(*nt), GFP_KERNEL); | |
e404decb | 593 | if (!nt) |
a6795e9e | 594 | return ERR_PTR(-ENOMEM); |
0bcc1816 SS |
595 | |
596 | nt->np.name = "netconsole"; | |
597 | strlcpy(nt->np.dev_name, "eth0", IFNAMSIZ); | |
598 | nt->np.local_port = 6665; | |
599 | nt->np.remote_port = 6666; | |
600 | memset(nt->np.remote_mac, 0xff, ETH_ALEN); | |
601 | ||
602 | /* Initialize the config_item member */ | |
603 | config_item_init_type_name(&nt->item, name, &netconsole_target_type); | |
604 | ||
605 | /* Adding, but it is disabled */ | |
606 | spin_lock_irqsave(&target_list_lock, flags); | |
607 | list_add(&nt->list, &target_list); | |
608 | spin_unlock_irqrestore(&target_list_lock, flags); | |
609 | ||
f89ab861 | 610 | return &nt->item; |
0bcc1816 SS |
611 | } |
612 | ||
613 | static void drop_netconsole_target(struct config_group *group, | |
614 | struct config_item *item) | |
615 | { | |
616 | unsigned long flags; | |
617 | struct netconsole_target *nt = to_target(item); | |
618 | ||
619 | spin_lock_irqsave(&target_list_lock, flags); | |
620 | list_del(&nt->list); | |
621 | spin_unlock_irqrestore(&target_list_lock, flags); | |
622 | ||
623 | /* | |
624 | * The target may have never been enabled, or was manually disabled | |
625 | * before being removed so netpoll may have already been cleaned up. | |
626 | */ | |
627 | if (nt->enabled) | |
628 | netpoll_cleanup(&nt->np); | |
629 | ||
630 | config_item_put(&nt->item); | |
631 | } | |
632 | ||
633 | static struct configfs_group_operations netconsole_subsys_group_ops = { | |
634 | .make_item = make_netconsole_target, | |
635 | .drop_item = drop_netconsole_target, | |
636 | }; | |
637 | ||
638 | static struct config_item_type netconsole_subsys_type = { | |
639 | .ct_group_ops = &netconsole_subsys_group_ops, | |
640 | .ct_owner = THIS_MODULE, | |
641 | }; | |
642 | ||
643 | /* The netconsole configfs subsystem */ | |
644 | static struct configfs_subsystem netconsole_subsys = { | |
645 | .su_group = { | |
646 | .cg_item = { | |
647 | .ci_namebuf = "netconsole", | |
648 | .ci_type = &netconsole_subsys_type, | |
649 | }, | |
650 | }, | |
651 | }; | |
652 | ||
653 | #endif /* CONFIG_NETCONSOLE_DYNAMIC */ | |
654 | ||
17951f34 SS |
655 | /* Handle network interface device notifications */ |
656 | static int netconsole_netdev_event(struct notifier_block *this, | |
657 | unsigned long event, | |
658 | void *ptr) | |
659 | { | |
b5427c27 SS |
660 | unsigned long flags; |
661 | struct netconsole_target *nt; | |
17951f34 | 662 | struct net_device *dev = ptr; |
141dfba3 | 663 | bool stopped = false; |
17951f34 | 664 | |
0e34e931 | 665 | if (!(event == NETDEV_CHANGENAME || event == NETDEV_UNREGISTER || |
daf9209b | 666 | event == NETDEV_RELEASE || event == NETDEV_JOIN)) |
b5427c27 SS |
667 | goto done; |
668 | ||
669 | spin_lock_irqsave(&target_list_lock, flags); | |
3f315bef | 670 | restart: |
b5427c27 | 671 | list_for_each_entry(nt, &target_list, list) { |
0bcc1816 | 672 | netconsole_target_get(nt); |
b5427c27 SS |
673 | if (nt->np.dev == dev) { |
674 | switch (event) { | |
b5427c27 SS |
675 | case NETDEV_CHANGENAME: |
676 | strlcpy(nt->np.dev_name, dev->name, IFNAMSIZ); | |
677 | break; | |
daf9209b | 678 | case NETDEV_RELEASE: |
8d8fc29d | 679 | case NETDEV_JOIN: |
2382b15b | 680 | case NETDEV_UNREGISTER: |
3b410a31 NH |
681 | /* |
682 | * rtnl_lock already held | |
3f315bef | 683 | * we might sleep in __netpoll_cleanup() |
3b410a31 | 684 | */ |
3f315bef VF |
685 | spin_unlock_irqrestore(&target_list_lock, flags); |
686 | __netpoll_cleanup(&nt->np); | |
687 | spin_lock_irqsave(&target_list_lock, flags); | |
688 | dev_put(nt->np.dev); | |
689 | nt->np.dev = NULL; | |
2382b15b | 690 | nt->enabled = 0; |
141dfba3 | 691 | stopped = true; |
3f315bef VF |
692 | netconsole_target_put(nt); |
693 | goto restart; | |
b5427c27 | 694 | } |
17951f34 | 695 | } |
0bcc1816 | 696 | netconsole_target_put(nt); |
17951f34 | 697 | } |
b5427c27 | 698 | spin_unlock_irqrestore(&target_list_lock, flags); |
8d8fc29d | 699 | if (stopped) { |
38cfb907 | 700 | printk(KERN_INFO "netconsole: network logging stopped on " |
8d8fc29d AW |
701 | "interface %s as it ", dev->name); |
702 | switch (event) { | |
703 | case NETDEV_UNREGISTER: | |
704 | printk(KERN_CONT "unregistered\n"); | |
705 | break; | |
daf9209b | 706 | case NETDEV_RELEASE: |
8d8fc29d AW |
707 | printk(KERN_CONT "released slaves\n"); |
708 | break; | |
709 | case NETDEV_JOIN: | |
710 | printk(KERN_CONT "is joining a master device\n"); | |
711 | break; | |
712 | } | |
713 | } | |
17951f34 | 714 | |
b5427c27 | 715 | done: |
17951f34 SS |
716 | return NOTIFY_DONE; |
717 | } | |
718 | ||
719 | static struct notifier_block netconsole_netdev_notifier = { | |
720 | .notifier_call = netconsole_netdev_event, | |
721 | }; | |
722 | ||
1da177e4 LT |
723 | static void write_msg(struct console *con, const char *msg, unsigned int len) |
724 | { | |
725 | int frag, left; | |
726 | unsigned long flags; | |
b5427c27 SS |
727 | struct netconsole_target *nt; |
728 | const char *tmp; | |
729 | ||
c1a60851 AW |
730 | if (oops_only && !oops_in_progress) |
731 | return; | |
b5427c27 SS |
732 | /* Avoid taking lock and disabling interrupts unnecessarily */ |
733 | if (list_empty(&target_list)) | |
734 | return; | |
735 | ||
736 | spin_lock_irqsave(&target_list_lock, flags); | |
737 | list_for_each_entry(nt, &target_list, list) { | |
0bcc1816 SS |
738 | netconsole_target_get(nt); |
739 | if (nt->enabled && netif_running(nt->np.dev)) { | |
b5427c27 SS |
740 | /* |
741 | * We nest this inside the for-each-target loop above | |
742 | * so that we're able to get as much logging out to | |
743 | * at least one target if we die inside here, instead | |
744 | * of unnecessarily keeping all targets in lock-step. | |
745 | */ | |
746 | tmp = msg; | |
747 | for (left = len; left;) { | |
748 | frag = min(left, MAX_PRINT_CHUNK); | |
749 | netpoll_send_udp(&nt->np, tmp, frag); | |
750 | tmp += frag; | |
751 | left -= frag; | |
752 | } | |
0cc120be | 753 | } |
0bcc1816 | 754 | netconsole_target_put(nt); |
1da177e4 | 755 | } |
b5427c27 | 756 | spin_unlock_irqrestore(&target_list_lock, flags); |
1da177e4 LT |
757 | } |
758 | ||
759 | static struct console netconsole = { | |
d39badf0 | 760 | .name = "netcon", |
0517deed | 761 | .flags = CON_ENABLED, |
d39badf0 | 762 | .write = write_msg, |
1da177e4 LT |
763 | }; |
764 | ||
d39badf0 | 765 | static int __init init_netconsole(void) |
1da177e4 | 766 | { |
0bcc1816 | 767 | int err; |
b5427c27 SS |
768 | struct netconsole_target *nt, *tmp; |
769 | unsigned long flags; | |
770 | char *target_config; | |
771 | char *input = config; | |
b41848b6 | 772 | |
0bcc1816 SS |
773 | if (strnlen(input, MAX_PARAM_LENGTH)) { |
774 | while ((target_config = strsep(&input, ";"))) { | |
775 | nt = alloc_param_target(target_config); | |
776 | if (IS_ERR(nt)) { | |
777 | err = PTR_ERR(nt); | |
778 | goto fail; | |
779 | } | |
0517deed ME |
780 | /* Dump existing printks when we register */ |
781 | netconsole.flags |= CON_PRINTBUFFER; | |
782 | ||
0bcc1816 SS |
783 | spin_lock_irqsave(&target_list_lock, flags); |
784 | list_add(&nt->list, &target_list); | |
785 | spin_unlock_irqrestore(&target_list_lock, flags); | |
b5427c27 | 786 | } |
b5427c27 | 787 | } |
1da177e4 | 788 | |
17951f34 SS |
789 | err = register_netdevice_notifier(&netconsole_netdev_notifier); |
790 | if (err) | |
b5427c27 | 791 | goto fail; |
17951f34 | 792 | |
0bcc1816 SS |
793 | err = dynamic_netconsole_init(); |
794 | if (err) | |
795 | goto undonotifier; | |
796 | ||
1da177e4 LT |
797 | register_console(&netconsole); |
798 | printk(KERN_INFO "netconsole: network logging started\n"); | |
d39badf0 | 799 | |
d39badf0 | 800 | return err; |
b5427c27 | 801 | |
0bcc1816 SS |
802 | undonotifier: |
803 | unregister_netdevice_notifier(&netconsole_netdev_notifier); | |
804 | ||
b5427c27 SS |
805 | fail: |
806 | printk(KERN_ERR "netconsole: cleaning up\n"); | |
807 | ||
808 | /* | |
0bcc1816 SS |
809 | * Remove all targets and destroy them (only targets created |
810 | * from the boot/module option exist here). Skipping the list | |
b5427c27 SS |
811 | * lock is safe here, and netpoll_cleanup() will sleep. |
812 | */ | |
813 | list_for_each_entry_safe(nt, tmp, &target_list, list) { | |
814 | list_del(&nt->list); | |
0bcc1816 | 815 | free_param_target(nt); |
b5427c27 SS |
816 | } |
817 | ||
818 | return err; | |
1da177e4 LT |
819 | } |
820 | ||
d39badf0 | 821 | static void __exit cleanup_netconsole(void) |
1da177e4 | 822 | { |
b5427c27 | 823 | struct netconsole_target *nt, *tmp; |
df180e36 | 824 | |
1da177e4 | 825 | unregister_console(&netconsole); |
0bcc1816 | 826 | dynamic_netconsole_exit(); |
17951f34 | 827 | unregister_netdevice_notifier(&netconsole_netdev_notifier); |
b5427c27 SS |
828 | |
829 | /* | |
0bcc1816 SS |
830 | * Targets created via configfs pin references on our module |
831 | * and would first be rmdir(2)'ed from userspace. We reach | |
832 | * here only when they are already destroyed, and only those | |
833 | * created from the boot/module option are left, so remove and | |
834 | * destroy them. Skipping the list lock is safe here, and | |
835 | * netpoll_cleanup() will sleep. | |
b5427c27 SS |
836 | */ |
837 | list_for_each_entry_safe(nt, tmp, &target_list, list) { | |
838 | list_del(&nt->list); | |
0bcc1816 | 839 | free_param_target(nt); |
b5427c27 | 840 | } |
1da177e4 LT |
841 | } |
842 | ||
97c7de05 LM |
843 | /* |
844 | * Use late_initcall to ensure netconsole is | |
845 | * initialized after network device driver if built-in. | |
846 | * | |
847 | * late_initcall() and module_init() are identical if built as module. | |
848 | */ | |
849 | late_initcall(init_netconsole); | |
1da177e4 | 850 | module_exit(cleanup_netconsole); |