Commit | Line | Data |
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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 | ||
22ded577 JP |
37 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
38 | ||
1da177e4 | 39 | #include <linux/mm.h> |
1da177e4 LT |
40 | #include <linux/init.h> |
41 | #include <linux/module.h> | |
5a0e3ad6 | 42 | #include <linux/slab.h> |
1da177e4 | 43 | #include <linux/console.h> |
1da177e4 | 44 | #include <linux/moduleparam.h> |
4cd5773a | 45 | #include <linux/kernel.h> |
1da177e4 | 46 | #include <linux/string.h> |
1da177e4 | 47 | #include <linux/netpoll.h> |
0bcc1816 SS |
48 | #include <linux/inet.h> |
49 | #include <linux/configfs.h> | |
1667c942 | 50 | #include <linux/etherdevice.h> |
1da177e4 LT |
51 | |
52 | MODULE_AUTHOR("Maintainer: Matt Mackall <mpm@selenic.com>"); | |
53 | MODULE_DESCRIPTION("Console driver for network interfaces"); | |
54 | MODULE_LICENSE("GPL"); | |
55 | ||
d39badf0 SS |
56 | #define MAX_PARAM_LENGTH 256 |
57 | #define MAX_PRINT_CHUNK 1000 | |
58 | ||
59 | static char config[MAX_PARAM_LENGTH]; | |
60 | module_param_string(netconsole, config, MAX_PARAM_LENGTH, 0); | |
61a2d07d | 61 | MODULE_PARM_DESC(netconsole, " netconsole=[src-port]@[src-ip]/[dev],[tgt-port]@<tgt-ip>/[tgt-macaddr]"); |
1da177e4 | 62 | |
c1a60851 AW |
63 | static bool oops_only = false; |
64 | module_param(oops_only, bool, 0600); | |
65 | MODULE_PARM_DESC(oops_only, "Only log oops messages"); | |
66 | ||
d2b60881 SS |
67 | #ifndef MODULE |
68 | static int __init option_setup(char *opt) | |
69 | { | |
70 | strlcpy(config, opt, MAX_PARAM_LENGTH); | |
71 | return 1; | |
72 | } | |
73 | __setup("netconsole=", option_setup); | |
74 | #endif /* MODULE */ | |
75 | ||
b5427c27 SS |
76 | /* Linked list of all configured targets */ |
77 | static LIST_HEAD(target_list); | |
78 | ||
79 | /* This needs to be a spinlock because write_msg() cannot sleep */ | |
80 | static DEFINE_SPINLOCK(target_list_lock); | |
81 | ||
df180e36 SS |
82 | /** |
83 | * struct netconsole_target - Represents a configured netconsole target. | |
b5427c27 | 84 | * @list: Links this target into the target_list. |
0bcc1816 SS |
85 | * @item: Links us into the configfs subsystem hierarchy. |
86 | * @enabled: On / off knob to enable / disable target. | |
87 | * Visible from userspace (read-write). | |
88 | * We maintain a strict 1:1 correspondence between this and | |
89 | * whether the corresponding netpoll is active or inactive. | |
90 | * Also, other parameters of a target may be modified at | |
91 | * runtime only when it is disabled (enabled == 0). | |
df180e36 | 92 | * @np: The netpoll structure for this target. |
0bcc1816 SS |
93 | * Contains the other userspace visible parameters: |
94 | * dev_name (read-write) | |
95 | * local_port (read-write) | |
96 | * remote_port (read-write) | |
97 | * local_ip (read-write) | |
98 | * remote_ip (read-write) | |
99 | * local_mac (read-only) | |
100 | * remote_mac (read-write) | |
df180e36 SS |
101 | */ |
102 | struct netconsole_target { | |
b5427c27 | 103 | struct list_head list; |
0bcc1816 SS |
104 | #ifdef CONFIG_NETCONSOLE_DYNAMIC |
105 | struct config_item item; | |
106 | #endif | |
107 | int enabled; | |
7a163bfb | 108 | struct mutex mutex; |
df180e36 SS |
109 | struct netpoll np; |
110 | }; | |
111 | ||
0bcc1816 SS |
112 | #ifdef CONFIG_NETCONSOLE_DYNAMIC |
113 | ||
114 | static struct configfs_subsystem netconsole_subsys; | |
115 | ||
116 | static int __init dynamic_netconsole_init(void) | |
117 | { | |
118 | config_group_init(&netconsole_subsys.su_group); | |
119 | mutex_init(&netconsole_subsys.su_mutex); | |
120 | return configfs_register_subsystem(&netconsole_subsys); | |
121 | } | |
122 | ||
123 | static void __exit dynamic_netconsole_exit(void) | |
124 | { | |
125 | configfs_unregister_subsystem(&netconsole_subsys); | |
126 | } | |
127 | ||
128 | /* | |
129 | * Targets that were created by parsing the boot/module option string | |
130 | * do not exist in the configfs hierarchy (and have NULL names) and will | |
131 | * never go away, so make these a no-op for them. | |
132 | */ | |
133 | static void netconsole_target_get(struct netconsole_target *nt) | |
134 | { | |
135 | if (config_item_name(&nt->item)) | |
136 | config_item_get(&nt->item); | |
137 | } | |
138 | ||
139 | static void netconsole_target_put(struct netconsole_target *nt) | |
140 | { | |
141 | if (config_item_name(&nt->item)) | |
142 | config_item_put(&nt->item); | |
143 | } | |
144 | ||
145 | #else /* !CONFIG_NETCONSOLE_DYNAMIC */ | |
146 | ||
147 | static int __init dynamic_netconsole_init(void) | |
148 | { | |
149 | return 0; | |
150 | } | |
151 | ||
152 | static void __exit dynamic_netconsole_exit(void) | |
153 | { | |
154 | } | |
155 | ||
156 | /* | |
157 | * No danger of targets going away from under us when dynamic | |
158 | * reconfigurability is off. | |
159 | */ | |
160 | static void netconsole_target_get(struct netconsole_target *nt) | |
161 | { | |
162 | } | |
163 | ||
164 | static void netconsole_target_put(struct netconsole_target *nt) | |
165 | { | |
166 | } | |
167 | ||
168 | #endif /* CONFIG_NETCONSOLE_DYNAMIC */ | |
169 | ||
170 | /* Allocate new target (from boot/module param) and setup netpoll for it */ | |
171 | static struct netconsole_target *alloc_param_target(char *target_config) | |
b5427c27 SS |
172 | { |
173 | int err = -ENOMEM; | |
174 | struct netconsole_target *nt; | |
175 | ||
0bcc1816 SS |
176 | /* |
177 | * Allocate and initialize with defaults. | |
178 | * Note that these targets get their config_item fields zeroed-out. | |
179 | */ | |
b5427c27 | 180 | nt = kzalloc(sizeof(*nt), GFP_KERNEL); |
e404decb | 181 | if (!nt) |
b5427c27 | 182 | goto fail; |
b5427c27 SS |
183 | |
184 | nt->np.name = "netconsole"; | |
185 | strlcpy(nt->np.dev_name, "eth0", IFNAMSIZ); | |
186 | nt->np.local_port = 6665; | |
187 | nt->np.remote_port = 6666; | |
7a163bfb | 188 | mutex_init(&nt->mutex); |
1667c942 | 189 | eth_broadcast_addr(nt->np.remote_mac); |
b5427c27 SS |
190 | |
191 | /* Parse parameters and setup netpoll */ | |
192 | err = netpoll_parse_options(&nt->np, target_config); | |
193 | if (err) | |
194 | goto fail; | |
195 | ||
196 | err = netpoll_setup(&nt->np); | |
197 | if (err) | |
198 | goto fail; | |
199 | ||
0bcc1816 SS |
200 | nt->enabled = 1; |
201 | ||
b5427c27 SS |
202 | return nt; |
203 | ||
204 | fail: | |
205 | kfree(nt); | |
206 | return ERR_PTR(err); | |
207 | } | |
208 | ||
0bcc1816 SS |
209 | /* Cleanup netpoll for given target (from boot/module param) and free it */ |
210 | static void free_param_target(struct netconsole_target *nt) | |
b5427c27 SS |
211 | { |
212 | netpoll_cleanup(&nt->np); | |
213 | kfree(nt); | |
214 | } | |
1da177e4 | 215 | |
0bcc1816 SS |
216 | #ifdef CONFIG_NETCONSOLE_DYNAMIC |
217 | ||
218 | /* | |
219 | * Our subsystem hierarchy is: | |
220 | * | |
221 | * /sys/kernel/config/netconsole/ | |
222 | * | | |
223 | * <target>/ | |
224 | * | enabled | |
225 | * | dev_name | |
226 | * | local_port | |
227 | * | remote_port | |
228 | * | local_ip | |
229 | * | remote_ip | |
230 | * | local_mac | |
231 | * | remote_mac | |
232 | * | | |
233 | * <target>/... | |
234 | */ | |
235 | ||
236 | struct netconsole_target_attr { | |
237 | struct configfs_attribute attr; | |
238 | ssize_t (*show)(struct netconsole_target *nt, | |
239 | char *buf); | |
240 | ssize_t (*store)(struct netconsole_target *nt, | |
241 | const char *buf, | |
242 | size_t count); | |
243 | }; | |
244 | ||
245 | static struct netconsole_target *to_target(struct config_item *item) | |
246 | { | |
247 | return item ? | |
248 | container_of(item, struct netconsole_target, item) : | |
249 | NULL; | |
250 | } | |
251 | ||
0bcc1816 SS |
252 | /* |
253 | * Attribute operations for netconsole_target. | |
254 | */ | |
255 | ||
256 | static ssize_t show_enabled(struct netconsole_target *nt, char *buf) | |
257 | { | |
258 | return snprintf(buf, PAGE_SIZE, "%d\n", nt->enabled); | |
259 | } | |
260 | ||
261 | static ssize_t show_dev_name(struct netconsole_target *nt, char *buf) | |
262 | { | |
263 | return snprintf(buf, PAGE_SIZE, "%s\n", nt->np.dev_name); | |
264 | } | |
265 | ||
266 | static ssize_t show_local_port(struct netconsole_target *nt, char *buf) | |
267 | { | |
268 | return snprintf(buf, PAGE_SIZE, "%d\n", nt->np.local_port); | |
269 | } | |
270 | ||
271 | static ssize_t show_remote_port(struct netconsole_target *nt, char *buf) | |
272 | { | |
273 | return snprintf(buf, PAGE_SIZE, "%d\n", nt->np.remote_port); | |
274 | } | |
275 | ||
276 | static ssize_t show_local_ip(struct netconsole_target *nt, char *buf) | |
277 | { | |
b3d936f3 CW |
278 | if (nt->np.ipv6) |
279 | return snprintf(buf, PAGE_SIZE, "%pI6c\n", &nt->np.local_ip.in6); | |
280 | else | |
b7394d24 | 281 | return snprintf(buf, PAGE_SIZE, "%pI4\n", &nt->np.local_ip); |
0bcc1816 SS |
282 | } |
283 | ||
284 | static ssize_t show_remote_ip(struct netconsole_target *nt, char *buf) | |
285 | { | |
b3d936f3 CW |
286 | if (nt->np.ipv6) |
287 | return snprintf(buf, PAGE_SIZE, "%pI6c\n", &nt->np.remote_ip.in6); | |
288 | else | |
b7394d24 | 289 | return snprintf(buf, PAGE_SIZE, "%pI4\n", &nt->np.remote_ip); |
0bcc1816 SS |
290 | } |
291 | ||
292 | static ssize_t show_local_mac(struct netconsole_target *nt, char *buf) | |
293 | { | |
09538641 | 294 | struct net_device *dev = nt->np.dev; |
e174961c | 295 | static const u8 bcast[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; |
09538641 | 296 | |
e174961c | 297 | return snprintf(buf, PAGE_SIZE, "%pM\n", dev ? dev->dev_addr : bcast); |
0bcc1816 SS |
298 | } |
299 | ||
300 | static ssize_t show_remote_mac(struct netconsole_target *nt, char *buf) | |
301 | { | |
e174961c | 302 | return snprintf(buf, PAGE_SIZE, "%pM\n", nt->np.remote_mac); |
0bcc1816 SS |
303 | } |
304 | ||
305 | /* | |
306 | * This one is special -- targets created through the configfs interface | |
307 | * are not enabled (and the corresponding netpoll activated) by default. | |
308 | * The user is expected to set the desired parameters first (which | |
309 | * would enable him to dynamically add new netpoll targets for new | |
310 | * network interfaces as and when they come up). | |
311 | */ | |
312 | static ssize_t store_enabled(struct netconsole_target *nt, | |
313 | const char *buf, | |
314 | size_t count) | |
315 | { | |
45e526e8 | 316 | unsigned long flags; |
99f823f9 | 317 | int enabled; |
0bcc1816 | 318 | int err; |
0bcc1816 | 319 | |
99f823f9 AD |
320 | err = kstrtoint(buf, 10, &enabled); |
321 | if (err < 0) | |
322 | return err; | |
323 | if (enabled < 0 || enabled > 1) | |
324 | return -EINVAL; | |
d5123480 | 325 | if (enabled == nt->enabled) { |
22ded577 JP |
326 | pr_info("network logging has already %s\n", |
327 | nt->enabled ? "started" : "stopped"); | |
d5123480 G |
328 | return -EINVAL; |
329 | } | |
0bcc1816 SS |
330 | |
331 | if (enabled) { /* 1 */ | |
0bcc1816 SS |
332 | /* |
333 | * Skip netpoll_parse_options() -- all the attributes are | |
334 | * already configured via configfs. Just print them out. | |
335 | */ | |
336 | netpoll_print_options(&nt->np); | |
337 | ||
338 | err = netpoll_setup(&nt->np); | |
c7c6effd | 339 | if (err) |
0bcc1816 | 340 | return err; |
0bcc1816 | 341 | |
394efd19 | 342 | pr_info("netconsole: network logging started\n"); |
0bcc1816 | 343 | } else { /* 0 */ |
45e526e8 NA |
344 | /* We need to disable the netconsole before cleaning it up |
345 | * otherwise we might end up in write_msg() with | |
346 | * nt->np.dev == NULL and nt->enabled == 1 | |
347 | */ | |
348 | spin_lock_irqsave(&target_list_lock, flags); | |
349 | nt->enabled = 0; | |
350 | spin_unlock_irqrestore(&target_list_lock, flags); | |
0bcc1816 SS |
351 | netpoll_cleanup(&nt->np); |
352 | } | |
353 | ||
354 | nt->enabled = enabled; | |
355 | ||
356 | return strnlen(buf, count); | |
357 | } | |
358 | ||
359 | static ssize_t store_dev_name(struct netconsole_target *nt, | |
360 | const char *buf, | |
361 | size_t count) | |
362 | { | |
363 | size_t len; | |
364 | ||
365 | if (nt->enabled) { | |
22ded577 JP |
366 | pr_err("target (%s) is enabled, disable to update parameters\n", |
367 | config_item_name(&nt->item)); | |
0bcc1816 SS |
368 | return -EINVAL; |
369 | } | |
370 | ||
371 | strlcpy(nt->np.dev_name, buf, IFNAMSIZ); | |
372 | ||
373 | /* Get rid of possible trailing newline from echo(1) */ | |
374 | len = strnlen(nt->np.dev_name, IFNAMSIZ); | |
375 | if (nt->np.dev_name[len - 1] == '\n') | |
376 | nt->np.dev_name[len - 1] = '\0'; | |
377 | ||
378 | return strnlen(buf, count); | |
379 | } | |
380 | ||
381 | static ssize_t store_local_port(struct netconsole_target *nt, | |
382 | const char *buf, | |
383 | size_t count) | |
384 | { | |
99f823f9 | 385 | int rv; |
0bcc1816 SS |
386 | |
387 | if (nt->enabled) { | |
22ded577 JP |
388 | pr_err("target (%s) is enabled, disable to update parameters\n", |
389 | config_item_name(&nt->item)); | |
0bcc1816 SS |
390 | return -EINVAL; |
391 | } | |
392 | ||
99f823f9 AD |
393 | rv = kstrtou16(buf, 10, &nt->np.local_port); |
394 | if (rv < 0) | |
395 | return rv; | |
0bcc1816 SS |
396 | return strnlen(buf, count); |
397 | } | |
398 | ||
399 | static ssize_t store_remote_port(struct netconsole_target *nt, | |
400 | const char *buf, | |
401 | size_t count) | |
402 | { | |
99f823f9 | 403 | int rv; |
0bcc1816 SS |
404 | |
405 | if (nt->enabled) { | |
22ded577 JP |
406 | pr_err("target (%s) is enabled, disable to update parameters\n", |
407 | config_item_name(&nt->item)); | |
0bcc1816 SS |
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) { | |
22ded577 JP |
422 | pr_err("target (%s) is enabled, disable to update parameters\n", |
423 | config_item_name(&nt->item)); | |
0bcc1816 SS |
424 | return -EINVAL; |
425 | } | |
426 | ||
b3d936f3 CW |
427 | if (strnchr(buf, count, ':')) { |
428 | const char *end; | |
429 | if (in6_pton(buf, count, nt->np.local_ip.in6.s6_addr, -1, &end) > 0) { | |
430 | if (*end && *end != '\n') { | |
22ded577 | 431 | pr_err("invalid IPv6 address at: <%c>\n", *end); |
b3d936f3 CW |
432 | return -EINVAL; |
433 | } | |
434 | nt->np.ipv6 = true; | |
435 | } else | |
436 | return -EINVAL; | |
437 | } else { | |
438 | if (!nt->np.ipv6) { | |
439 | nt->np.local_ip.ip = in_aton(buf); | |
440 | } else | |
441 | return -EINVAL; | |
442 | } | |
0bcc1816 SS |
443 | |
444 | return strnlen(buf, count); | |
445 | } | |
446 | ||
447 | static ssize_t store_remote_ip(struct netconsole_target *nt, | |
448 | const char *buf, | |
449 | size_t count) | |
450 | { | |
451 | if (nt->enabled) { | |
22ded577 JP |
452 | pr_err("target (%s) is enabled, disable to update parameters\n", |
453 | config_item_name(&nt->item)); | |
0bcc1816 SS |
454 | return -EINVAL; |
455 | } | |
456 | ||
b3d936f3 CW |
457 | if (strnchr(buf, count, ':')) { |
458 | const char *end; | |
459 | if (in6_pton(buf, count, nt->np.remote_ip.in6.s6_addr, -1, &end) > 0) { | |
460 | if (*end && *end != '\n') { | |
22ded577 | 461 | pr_err("invalid IPv6 address at: <%c>\n", *end); |
b3d936f3 CW |
462 | return -EINVAL; |
463 | } | |
464 | nt->np.ipv6 = true; | |
465 | } else | |
466 | return -EINVAL; | |
467 | } else { | |
468 | if (!nt->np.ipv6) { | |
469 | nt->np.remote_ip.ip = in_aton(buf); | |
470 | } else | |
471 | return -EINVAL; | |
472 | } | |
0bcc1816 SS |
473 | |
474 | return strnlen(buf, count); | |
475 | } | |
476 | ||
477 | static ssize_t store_remote_mac(struct netconsole_target *nt, | |
478 | const char *buf, | |
479 | size_t count) | |
480 | { | |
481 | u8 remote_mac[ETH_ALEN]; | |
0bcc1816 SS |
482 | |
483 | if (nt->enabled) { | |
22ded577 JP |
484 | pr_err("target (%s) is enabled, disable to update parameters\n", |
485 | config_item_name(&nt->item)); | |
0bcc1816 SS |
486 | return -EINVAL; |
487 | } | |
488 | ||
4940fc88 AD |
489 | if (!mac_pton(buf, remote_mac)) |
490 | return -EINVAL; | |
491 | if (buf[3 * ETH_ALEN - 1] && buf[3 * ETH_ALEN - 1] != '\n') | |
492 | return -EINVAL; | |
0bcc1816 SS |
493 | memcpy(nt->np.remote_mac, remote_mac, ETH_ALEN); |
494 | ||
495 | return strnlen(buf, count); | |
0bcc1816 SS |
496 | } |
497 | ||
498 | /* | |
499 | * Attribute definitions for netconsole_target. | |
500 | */ | |
501 | ||
502 | #define NETCONSOLE_TARGET_ATTR_RO(_name) \ | |
503 | static struct netconsole_target_attr netconsole_target_##_name = \ | |
504 | __CONFIGFS_ATTR(_name, S_IRUGO, show_##_name, NULL) | |
505 | ||
506 | #define NETCONSOLE_TARGET_ATTR_RW(_name) \ | |
507 | static struct netconsole_target_attr netconsole_target_##_name = \ | |
508 | __CONFIGFS_ATTR(_name, S_IRUGO | S_IWUSR, show_##_name, store_##_name) | |
509 | ||
510 | NETCONSOLE_TARGET_ATTR_RW(enabled); | |
511 | NETCONSOLE_TARGET_ATTR_RW(dev_name); | |
512 | NETCONSOLE_TARGET_ATTR_RW(local_port); | |
513 | NETCONSOLE_TARGET_ATTR_RW(remote_port); | |
514 | NETCONSOLE_TARGET_ATTR_RW(local_ip); | |
515 | NETCONSOLE_TARGET_ATTR_RW(remote_ip); | |
516 | NETCONSOLE_TARGET_ATTR_RO(local_mac); | |
517 | NETCONSOLE_TARGET_ATTR_RW(remote_mac); | |
518 | ||
519 | static struct configfs_attribute *netconsole_target_attrs[] = { | |
520 | &netconsole_target_enabled.attr, | |
521 | &netconsole_target_dev_name.attr, | |
522 | &netconsole_target_local_port.attr, | |
523 | &netconsole_target_remote_port.attr, | |
524 | &netconsole_target_local_ip.attr, | |
525 | &netconsole_target_remote_ip.attr, | |
526 | &netconsole_target_local_mac.attr, | |
527 | &netconsole_target_remote_mac.attr, | |
528 | NULL, | |
529 | }; | |
530 | ||
531 | /* | |
532 | * Item operations and type for netconsole_target. | |
533 | */ | |
534 | ||
535 | static void netconsole_target_release(struct config_item *item) | |
536 | { | |
537 | kfree(to_target(item)); | |
538 | } | |
539 | ||
540 | static ssize_t netconsole_target_attr_show(struct config_item *item, | |
541 | struct configfs_attribute *attr, | |
542 | char *buf) | |
543 | { | |
544 | ssize_t ret = -EINVAL; | |
545 | struct netconsole_target *nt = to_target(item); | |
546 | struct netconsole_target_attr *na = | |
547 | container_of(attr, struct netconsole_target_attr, attr); | |
548 | ||
549 | if (na->show) | |
550 | ret = na->show(nt, buf); | |
551 | ||
552 | return ret; | |
553 | } | |
554 | ||
555 | static ssize_t netconsole_target_attr_store(struct config_item *item, | |
556 | struct configfs_attribute *attr, | |
557 | const char *buf, | |
558 | size_t count) | |
559 | { | |
560 | ssize_t ret = -EINVAL; | |
561 | struct netconsole_target *nt = to_target(item); | |
562 | struct netconsole_target_attr *na = | |
563 | container_of(attr, struct netconsole_target_attr, attr); | |
564 | ||
c7c6effd | 565 | mutex_lock(&nt->mutex); |
0bcc1816 SS |
566 | if (na->store) |
567 | ret = na->store(nt, buf, count); | |
c7c6effd | 568 | mutex_unlock(&nt->mutex); |
0bcc1816 SS |
569 | |
570 | return ret; | |
571 | } | |
572 | ||
573 | static struct configfs_item_operations netconsole_target_item_ops = { | |
574 | .release = netconsole_target_release, | |
575 | .show_attribute = netconsole_target_attr_show, | |
576 | .store_attribute = netconsole_target_attr_store, | |
577 | }; | |
578 | ||
579 | static struct config_item_type netconsole_target_type = { | |
580 | .ct_attrs = netconsole_target_attrs, | |
581 | .ct_item_ops = &netconsole_target_item_ops, | |
582 | .ct_owner = THIS_MODULE, | |
583 | }; | |
584 | ||
585 | /* | |
586 | * Group operations and type for netconsole_subsys. | |
587 | */ | |
588 | ||
f89ab861 JB |
589 | static struct config_item *make_netconsole_target(struct config_group *group, |
590 | const char *name) | |
0bcc1816 SS |
591 | { |
592 | unsigned long flags; | |
593 | struct netconsole_target *nt; | |
594 | ||
595 | /* | |
596 | * Allocate and initialize with defaults. | |
597 | * Target is disabled at creation (enabled == 0). | |
598 | */ | |
599 | nt = kzalloc(sizeof(*nt), GFP_KERNEL); | |
e404decb | 600 | if (!nt) |
a6795e9e | 601 | return ERR_PTR(-ENOMEM); |
0bcc1816 SS |
602 | |
603 | nt->np.name = "netconsole"; | |
604 | strlcpy(nt->np.dev_name, "eth0", IFNAMSIZ); | |
605 | nt->np.local_port = 6665; | |
606 | nt->np.remote_port = 6666; | |
7a163bfb | 607 | mutex_init(&nt->mutex); |
1667c942 | 608 | eth_broadcast_addr(nt->np.remote_mac); |
0bcc1816 SS |
609 | |
610 | /* Initialize the config_item member */ | |
611 | config_item_init_type_name(&nt->item, name, &netconsole_target_type); | |
612 | ||
613 | /* Adding, but it is disabled */ | |
614 | spin_lock_irqsave(&target_list_lock, flags); | |
615 | list_add(&nt->list, &target_list); | |
616 | spin_unlock_irqrestore(&target_list_lock, flags); | |
617 | ||
f89ab861 | 618 | return &nt->item; |
0bcc1816 SS |
619 | } |
620 | ||
621 | static void drop_netconsole_target(struct config_group *group, | |
622 | struct config_item *item) | |
623 | { | |
624 | unsigned long flags; | |
625 | struct netconsole_target *nt = to_target(item); | |
626 | ||
627 | spin_lock_irqsave(&target_list_lock, flags); | |
628 | list_del(&nt->list); | |
629 | spin_unlock_irqrestore(&target_list_lock, flags); | |
630 | ||
631 | /* | |
632 | * The target may have never been enabled, or was manually disabled | |
633 | * before being removed so netpoll may have already been cleaned up. | |
634 | */ | |
635 | if (nt->enabled) | |
636 | netpoll_cleanup(&nt->np); | |
637 | ||
638 | config_item_put(&nt->item); | |
639 | } | |
640 | ||
641 | static struct configfs_group_operations netconsole_subsys_group_ops = { | |
642 | .make_item = make_netconsole_target, | |
643 | .drop_item = drop_netconsole_target, | |
644 | }; | |
645 | ||
646 | static struct config_item_type netconsole_subsys_type = { | |
647 | .ct_group_ops = &netconsole_subsys_group_ops, | |
648 | .ct_owner = THIS_MODULE, | |
649 | }; | |
650 | ||
651 | /* The netconsole configfs subsystem */ | |
652 | static struct configfs_subsystem netconsole_subsys = { | |
653 | .su_group = { | |
654 | .cg_item = { | |
655 | .ci_namebuf = "netconsole", | |
656 | .ci_type = &netconsole_subsys_type, | |
657 | }, | |
658 | }, | |
659 | }; | |
660 | ||
661 | #endif /* CONFIG_NETCONSOLE_DYNAMIC */ | |
662 | ||
17951f34 SS |
663 | /* Handle network interface device notifications */ |
664 | static int netconsole_netdev_event(struct notifier_block *this, | |
351638e7 | 665 | unsigned long event, void *ptr) |
17951f34 | 666 | { |
b5427c27 SS |
667 | unsigned long flags; |
668 | struct netconsole_target *nt; | |
351638e7 | 669 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
141dfba3 | 670 | bool stopped = false; |
17951f34 | 671 | |
0e34e931 | 672 | if (!(event == NETDEV_CHANGENAME || event == NETDEV_UNREGISTER || |
daf9209b | 673 | event == NETDEV_RELEASE || event == NETDEV_JOIN)) |
b5427c27 SS |
674 | goto done; |
675 | ||
676 | spin_lock_irqsave(&target_list_lock, flags); | |
3f315bef | 677 | restart: |
b5427c27 | 678 | list_for_each_entry(nt, &target_list, list) { |
0bcc1816 | 679 | netconsole_target_get(nt); |
b5427c27 SS |
680 | if (nt->np.dev == dev) { |
681 | switch (event) { | |
b5427c27 SS |
682 | case NETDEV_CHANGENAME: |
683 | strlcpy(nt->np.dev_name, dev->name, IFNAMSIZ); | |
684 | break; | |
daf9209b | 685 | case NETDEV_RELEASE: |
8d8fc29d | 686 | case NETDEV_JOIN: |
2382b15b | 687 | case NETDEV_UNREGISTER: |
c71380ff | 688 | /* rtnl_lock already held |
3f315bef | 689 | * we might sleep in __netpoll_cleanup() |
3b410a31 | 690 | */ |
3f315bef | 691 | spin_unlock_irqrestore(&target_list_lock, flags); |
7a163bfb | 692 | |
3f315bef | 693 | __netpoll_cleanup(&nt->np); |
7a163bfb | 694 | |
3f315bef VF |
695 | spin_lock_irqsave(&target_list_lock, flags); |
696 | dev_put(nt->np.dev); | |
697 | nt->np.dev = NULL; | |
2382b15b | 698 | nt->enabled = 0; |
141dfba3 | 699 | stopped = true; |
3f315bef VF |
700 | netconsole_target_put(nt); |
701 | goto restart; | |
b5427c27 | 702 | } |
17951f34 | 703 | } |
0bcc1816 | 704 | netconsole_target_put(nt); |
17951f34 | 705 | } |
b5427c27 | 706 | spin_unlock_irqrestore(&target_list_lock, flags); |
8d8fc29d | 707 | if (stopped) { |
22ded577 | 708 | const char *msg = "had an event"; |
8d8fc29d AW |
709 | switch (event) { |
710 | case NETDEV_UNREGISTER: | |
22ded577 | 711 | msg = "unregistered"; |
8d8fc29d | 712 | break; |
daf9209b | 713 | case NETDEV_RELEASE: |
22ded577 | 714 | msg = "released slaves"; |
8d8fc29d AW |
715 | break; |
716 | case NETDEV_JOIN: | |
22ded577 | 717 | msg = "is joining a master device"; |
8d8fc29d AW |
718 | break; |
719 | } | |
22ded577 JP |
720 | pr_info("network logging stopped on interface %s as it %s\n", |
721 | dev->name, msg); | |
8d8fc29d | 722 | } |
17951f34 | 723 | |
b5427c27 | 724 | done: |
17951f34 SS |
725 | return NOTIFY_DONE; |
726 | } | |
727 | ||
728 | static struct notifier_block netconsole_netdev_notifier = { | |
729 | .notifier_call = netconsole_netdev_event, | |
730 | }; | |
731 | ||
1da177e4 LT |
732 | static void write_msg(struct console *con, const char *msg, unsigned int len) |
733 | { | |
734 | int frag, left; | |
735 | unsigned long flags; | |
b5427c27 SS |
736 | struct netconsole_target *nt; |
737 | const char *tmp; | |
738 | ||
c1a60851 AW |
739 | if (oops_only && !oops_in_progress) |
740 | return; | |
b5427c27 SS |
741 | /* Avoid taking lock and disabling interrupts unnecessarily */ |
742 | if (list_empty(&target_list)) | |
743 | return; | |
744 | ||
745 | spin_lock_irqsave(&target_list_lock, flags); | |
746 | list_for_each_entry(nt, &target_list, list) { | |
0bcc1816 SS |
747 | netconsole_target_get(nt); |
748 | if (nt->enabled && netif_running(nt->np.dev)) { | |
b5427c27 SS |
749 | /* |
750 | * We nest this inside the for-each-target loop above | |
751 | * so that we're able to get as much logging out to | |
752 | * at least one target if we die inside here, instead | |
753 | * of unnecessarily keeping all targets in lock-step. | |
754 | */ | |
755 | tmp = msg; | |
756 | for (left = len; left;) { | |
757 | frag = min(left, MAX_PRINT_CHUNK); | |
758 | netpoll_send_udp(&nt->np, tmp, frag); | |
759 | tmp += frag; | |
760 | left -= frag; | |
761 | } | |
0cc120be | 762 | } |
0bcc1816 | 763 | netconsole_target_put(nt); |
1da177e4 | 764 | } |
b5427c27 | 765 | spin_unlock_irqrestore(&target_list_lock, flags); |
1da177e4 LT |
766 | } |
767 | ||
768 | static struct console netconsole = { | |
d39badf0 | 769 | .name = "netcon", |
0517deed | 770 | .flags = CON_ENABLED, |
d39badf0 | 771 | .write = write_msg, |
1da177e4 LT |
772 | }; |
773 | ||
d39badf0 | 774 | static int __init init_netconsole(void) |
1da177e4 | 775 | { |
0bcc1816 | 776 | int err; |
b5427c27 SS |
777 | struct netconsole_target *nt, *tmp; |
778 | unsigned long flags; | |
779 | char *target_config; | |
780 | char *input = config; | |
b41848b6 | 781 | |
0bcc1816 SS |
782 | if (strnlen(input, MAX_PARAM_LENGTH)) { |
783 | while ((target_config = strsep(&input, ";"))) { | |
784 | nt = alloc_param_target(target_config); | |
785 | if (IS_ERR(nt)) { | |
786 | err = PTR_ERR(nt); | |
787 | goto fail; | |
788 | } | |
0517deed ME |
789 | /* Dump existing printks when we register */ |
790 | netconsole.flags |= CON_PRINTBUFFER; | |
791 | ||
0bcc1816 SS |
792 | spin_lock_irqsave(&target_list_lock, flags); |
793 | list_add(&nt->list, &target_list); | |
794 | spin_unlock_irqrestore(&target_list_lock, flags); | |
b5427c27 | 795 | } |
b5427c27 | 796 | } |
1da177e4 | 797 | |
17951f34 SS |
798 | err = register_netdevice_notifier(&netconsole_netdev_notifier); |
799 | if (err) | |
b5427c27 | 800 | goto fail; |
17951f34 | 801 | |
0bcc1816 SS |
802 | err = dynamic_netconsole_init(); |
803 | if (err) | |
804 | goto undonotifier; | |
805 | ||
1da177e4 | 806 | register_console(&netconsole); |
22ded577 | 807 | pr_info("network logging started\n"); |
d39badf0 | 808 | |
d39badf0 | 809 | return err; |
b5427c27 | 810 | |
0bcc1816 SS |
811 | undonotifier: |
812 | unregister_netdevice_notifier(&netconsole_netdev_notifier); | |
813 | ||
b5427c27 | 814 | fail: |
22ded577 | 815 | pr_err("cleaning up\n"); |
b5427c27 SS |
816 | |
817 | /* | |
0bcc1816 SS |
818 | * Remove all targets and destroy them (only targets created |
819 | * from the boot/module option exist here). Skipping the list | |
b5427c27 SS |
820 | * lock is safe here, and netpoll_cleanup() will sleep. |
821 | */ | |
822 | list_for_each_entry_safe(nt, tmp, &target_list, list) { | |
823 | list_del(&nt->list); | |
0bcc1816 | 824 | free_param_target(nt); |
b5427c27 SS |
825 | } |
826 | ||
827 | return err; | |
1da177e4 LT |
828 | } |
829 | ||
d39badf0 | 830 | static void __exit cleanup_netconsole(void) |
1da177e4 | 831 | { |
b5427c27 | 832 | struct netconsole_target *nt, *tmp; |
df180e36 | 833 | |
1da177e4 | 834 | unregister_console(&netconsole); |
0bcc1816 | 835 | dynamic_netconsole_exit(); |
17951f34 | 836 | unregister_netdevice_notifier(&netconsole_netdev_notifier); |
b5427c27 SS |
837 | |
838 | /* | |
0bcc1816 SS |
839 | * Targets created via configfs pin references on our module |
840 | * and would first be rmdir(2)'ed from userspace. We reach | |
841 | * here only when they are already destroyed, and only those | |
842 | * created from the boot/module option are left, so remove and | |
843 | * destroy them. Skipping the list lock is safe here, and | |
844 | * netpoll_cleanup() will sleep. | |
b5427c27 SS |
845 | */ |
846 | list_for_each_entry_safe(nt, tmp, &target_list, list) { | |
847 | list_del(&nt->list); | |
0bcc1816 | 848 | free_param_target(nt); |
b5427c27 | 849 | } |
1da177e4 LT |
850 | } |
851 | ||
97c7de05 LM |
852 | /* |
853 | * Use late_initcall to ensure netconsole is | |
854 | * initialized after network device driver if built-in. | |
855 | * | |
856 | * late_initcall() and module_init() are identical if built as module. | |
857 | */ | |
858 | late_initcall(init_netconsole); | |
1da177e4 | 859 | module_exit(cleanup_netconsole); |