blob: 0e27920c2b6b6219e70871ad13031bf56711907e [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Joe Perches22ded572013-10-28 12:53:21 -070037#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
38
Linus Torvalds1da177e2005-04-16 15:20:36 -070039#include <linux/mm.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070040#include <linux/init.h>
41#include <linux/module.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090042#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070043#include <linux/console.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070044#include <linux/moduleparam.h>
Andy Shevchenko4cd57732013-06-04 19:46:26 +030045#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070046#include <linux/string.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070047#include <linux/netpoll.h>
Satyam Sharma0bcc1812007-08-10 15:35:05 -070048#include <linux/inet.h>
49#include <linux/configfs.h>
Joe Perches1667c942015-03-02 19:54:50 -080050#include <linux/etherdevice.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
52MODULE_AUTHOR("Maintainer: Matt Mackall <mpm@selenic.com>");
53MODULE_DESCRIPTION("Console driver for network interfaces");
54MODULE_LICENSE("GPL");
55
Satyam Sharmad39badf2007-08-10 15:27:24 -070056#define MAX_PARAM_LENGTH 256
57#define MAX_PRINT_CHUNK 1000
58
59static char config[MAX_PARAM_LENGTH];
60module_param_string(netconsole, config, MAX_PARAM_LENGTH, 0);
Niels de Vos61a2d072008-07-31 00:07:23 -070061MODULE_PARM_DESC(netconsole, " netconsole=[src-port]@[src-ip]/[dev],[tgt-port]@<tgt-ip>/[tgt-macaddr]");
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
Amerigo Wangc1a60852012-11-08 03:42:38 +000063static bool oops_only = false;
64module_param(oops_only, bool, 0600);
65MODULE_PARM_DESC(oops_only, "Only log oops messages");
66
Satyam Sharmad2b60882007-08-10 15:29:47 -070067#ifndef MODULE
68static 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
Satyam Sharmab5427c22007-08-10 15:33:40 -070076/* Linked list of all configured targets */
77static LIST_HEAD(target_list);
78
79/* This needs to be a spinlock because write_msg() cannot sleep */
80static DEFINE_SPINLOCK(target_list_lock);
81
Tejun Heoe2f15f92015-06-25 15:01:41 -070082/*
83 * Console driver for extended netconsoles. Registered on the first use to
84 * avoid unnecessarily enabling ext message formatting.
85 */
86static struct console netconsole_ext;
87
Satyam Sharmadf180e32007-08-10 15:32:14 -070088/**
89 * struct netconsole_target - Represents a configured netconsole target.
Satyam Sharmab5427c22007-08-10 15:33:40 -070090 * @list: Links this target into the target_list.
Satyam Sharma0bcc1812007-08-10 15:35:05 -070091 * @item: Links us into the configfs subsystem hierarchy.
92 * @enabled: On / off knob to enable / disable target.
93 * Visible from userspace (read-write).
94 * We maintain a strict 1:1 correspondence between this and
95 * whether the corresponding netpoll is active or inactive.
96 * Also, other parameters of a target may be modified at
97 * runtime only when it is disabled (enabled == 0).
Satyam Sharmadf180e32007-08-10 15:32:14 -070098 * @np: The netpoll structure for this target.
Satyam Sharma0bcc1812007-08-10 15:35:05 -070099 * Contains the other userspace visible parameters:
100 * dev_name (read-write)
101 * local_port (read-write)
102 * remote_port (read-write)
103 * local_ip (read-write)
104 * remote_ip (read-write)
105 * local_mac (read-only)
106 * remote_mac (read-write)
Satyam Sharmadf180e32007-08-10 15:32:14 -0700107 */
108struct netconsole_target {
Satyam Sharmab5427c22007-08-10 15:33:40 -0700109 struct list_head list;
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700110#ifdef CONFIG_NETCONSOLE_DYNAMIC
111 struct config_item item;
112#endif
Tejun Heo698cf1c2015-06-25 15:01:36 -0700113 bool enabled;
Tejun Heoe2f15f92015-06-25 15:01:41 -0700114 bool extended;
Satyam Sharmadf180e32007-08-10 15:32:14 -0700115 struct netpoll np;
116};
117
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700118#ifdef CONFIG_NETCONSOLE_DYNAMIC
119
120static struct configfs_subsystem netconsole_subsys;
Tejun Heo369e5a82015-06-25 15:01:38 -0700121static DEFINE_MUTEX(dynamic_netconsole_mutex);
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700122
123static int __init dynamic_netconsole_init(void)
124{
125 config_group_init(&netconsole_subsys.su_group);
126 mutex_init(&netconsole_subsys.su_mutex);
127 return configfs_register_subsystem(&netconsole_subsys);
128}
129
130static void __exit dynamic_netconsole_exit(void)
131{
132 configfs_unregister_subsystem(&netconsole_subsys);
133}
134
135/*
136 * Targets that were created by parsing the boot/module option string
137 * do not exist in the configfs hierarchy (and have NULL names) and will
138 * never go away, so make these a no-op for them.
139 */
140static void netconsole_target_get(struct netconsole_target *nt)
141{
142 if (config_item_name(&nt->item))
143 config_item_get(&nt->item);
144}
145
146static void netconsole_target_put(struct netconsole_target *nt)
147{
148 if (config_item_name(&nt->item))
149 config_item_put(&nt->item);
150}
151
152#else /* !CONFIG_NETCONSOLE_DYNAMIC */
153
154static int __init dynamic_netconsole_init(void)
155{
156 return 0;
157}
158
159static void __exit dynamic_netconsole_exit(void)
160{
161}
162
163/*
164 * No danger of targets going away from under us when dynamic
165 * reconfigurability is off.
166 */
167static void netconsole_target_get(struct netconsole_target *nt)
168{
169}
170
171static void netconsole_target_put(struct netconsole_target *nt)
172{
173}
174
175#endif /* CONFIG_NETCONSOLE_DYNAMIC */
176
177/* Allocate new target (from boot/module param) and setup netpoll for it */
178static struct netconsole_target *alloc_param_target(char *target_config)
Satyam Sharmab5427c22007-08-10 15:33:40 -0700179{
180 int err = -ENOMEM;
181 struct netconsole_target *nt;
182
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700183 /*
184 * Allocate and initialize with defaults.
185 * Note that these targets get their config_item fields zeroed-out.
186 */
Satyam Sharmab5427c22007-08-10 15:33:40 -0700187 nt = kzalloc(sizeof(*nt), GFP_KERNEL);
Joe Perchese404dec2012-01-29 12:56:23 +0000188 if (!nt)
Satyam Sharmab5427c22007-08-10 15:33:40 -0700189 goto fail;
Satyam Sharmab5427c22007-08-10 15:33:40 -0700190
191 nt->np.name = "netconsole";
192 strlcpy(nt->np.dev_name, "eth0", IFNAMSIZ);
193 nt->np.local_port = 6665;
194 nt->np.remote_port = 6666;
Joe Perches1667c942015-03-02 19:54:50 -0800195 eth_broadcast_addr(nt->np.remote_mac);
Satyam Sharmab5427c22007-08-10 15:33:40 -0700196
Tejun Heoe2f15f92015-06-25 15:01:41 -0700197 if (*target_config == '+') {
198 nt->extended = true;
199 target_config++;
200 }
201
Satyam Sharmab5427c22007-08-10 15:33:40 -0700202 /* Parse parameters and setup netpoll */
203 err = netpoll_parse_options(&nt->np, target_config);
204 if (err)
205 goto fail;
206
207 err = netpoll_setup(&nt->np);
208 if (err)
209 goto fail;
210
Tejun Heo698cf1c2015-06-25 15:01:36 -0700211 nt->enabled = true;
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700212
Satyam Sharmab5427c22007-08-10 15:33:40 -0700213 return nt;
214
215fail:
216 kfree(nt);
217 return ERR_PTR(err);
218}
219
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700220/* Cleanup netpoll for given target (from boot/module param) and free it */
221static void free_param_target(struct netconsole_target *nt)
Satyam Sharmab5427c22007-08-10 15:33:40 -0700222{
223 netpoll_cleanup(&nt->np);
224 kfree(nt);
225}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700227#ifdef CONFIG_NETCONSOLE_DYNAMIC
228
229/*
230 * Our subsystem hierarchy is:
231 *
232 * /sys/kernel/config/netconsole/
233 * |
234 * <target>/
235 * | enabled
236 * | dev_name
237 * | local_port
238 * | remote_port
239 * | local_ip
240 * | remote_ip
241 * | local_mac
242 * | remote_mac
243 * |
244 * <target>/...
245 */
246
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700247static struct netconsole_target *to_target(struct config_item *item)
248{
249 return item ?
250 container_of(item, struct netconsole_target, item) :
251 NULL;
252}
253
254/*
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700255 * Attribute operations for netconsole_target.
256 */
257
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200258static ssize_t enabled_show(struct config_item *item, char *buf)
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700259{
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200260 return snprintf(buf, PAGE_SIZE, "%d\n", to_target(item)->enabled);
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700261}
262
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200263static ssize_t extended_show(struct config_item *item, char *buf)
Tejun Heoe2f15f92015-06-25 15:01:41 -0700264{
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200265 return snprintf(buf, PAGE_SIZE, "%d\n", to_target(item)->extended);
Tejun Heoe2f15f92015-06-25 15:01:41 -0700266}
267
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200268static ssize_t dev_name_show(struct config_item *item, char *buf)
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700269{
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200270 return snprintf(buf, PAGE_SIZE, "%s\n", to_target(item)->np.dev_name);
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700271}
272
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200273static ssize_t local_port_show(struct config_item *item, char *buf)
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700274{
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200275 return snprintf(buf, PAGE_SIZE, "%d\n", to_target(item)->np.local_port);
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700276}
277
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200278static ssize_t remote_port_show(struct config_item *item, char *buf)
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700279{
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200280 return snprintf(buf, PAGE_SIZE, "%d\n", to_target(item)->np.remote_port);
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700281}
282
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200283static ssize_t local_ip_show(struct config_item *item, char *buf)
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700284{
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200285 struct netconsole_target *nt = to_target(item);
286
Cong Wangb3d936f2013-01-07 20:52:41 +0000287 if (nt->np.ipv6)
288 return snprintf(buf, PAGE_SIZE, "%pI6c\n", &nt->np.local_ip.in6);
289 else
Cong Wangb7394d22013-01-07 20:52:39 +0000290 return snprintf(buf, PAGE_SIZE, "%pI4\n", &nt->np.local_ip);
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700291}
292
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200293static ssize_t remote_ip_show(struct config_item *item, char *buf)
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700294{
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200295 struct netconsole_target *nt = to_target(item);
296
Cong Wangb3d936f2013-01-07 20:52:41 +0000297 if (nt->np.ipv6)
298 return snprintf(buf, PAGE_SIZE, "%pI6c\n", &nt->np.remote_ip.in6);
299 else
Cong Wangb7394d22013-01-07 20:52:39 +0000300 return snprintf(buf, PAGE_SIZE, "%pI4\n", &nt->np.remote_ip);
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700301}
302
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200303static ssize_t local_mac_show(struct config_item *item, char *buf)
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700304{
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200305 struct net_device *dev = to_target(item)->np.dev;
Johannes Berge1749612008-10-27 15:59:26 -0700306 static const u8 bcast[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
Stephen Hemminger09538642007-11-19 19:23:29 -0800307
Johannes Berge1749612008-10-27 15:59:26 -0700308 return snprintf(buf, PAGE_SIZE, "%pM\n", dev ? dev->dev_addr : bcast);
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700309}
310
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200311static ssize_t remote_mac_show(struct config_item *item, char *buf)
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700312{
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200313 return snprintf(buf, PAGE_SIZE, "%pM\n", to_target(item)->np.remote_mac);
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700314}
315
316/*
317 * This one is special -- targets created through the configfs interface
318 * are not enabled (and the corresponding netpoll activated) by default.
319 * The user is expected to set the desired parameters first (which
320 * would enable him to dynamically add new netpoll targets for new
321 * network interfaces as and when they come up).
322 */
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200323static ssize_t enabled_store(struct config_item *item,
324 const char *buf, size_t count)
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700325{
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200326 struct netconsole_target *nt = to_target(item);
Nikolay Aleksandrov45e526e2013-10-23 15:04:49 +0200327 unsigned long flags;
Alexey Dobriyan99f823f2011-05-07 20:33:13 +0000328 int enabled;
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700329 int err;
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700330
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200331 mutex_lock(&dynamic_netconsole_mutex);
Alexey Dobriyan99f823f2011-05-07 20:33:13 +0000332 err = kstrtoint(buf, 10, &enabled);
333 if (err < 0)
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200334 goto out_unlock;
335
336 err = -EINVAL;
Alexey Dobriyan99f823f2011-05-07 20:33:13 +0000337 if (enabled < 0 || enabled > 1)
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200338 goto out_unlock;
Tejun Heo698cf1c2015-06-25 15:01:36 -0700339 if ((bool)enabled == nt->enabled) {
Joe Perches22ded572013-10-28 12:53:21 -0700340 pr_info("network logging has already %s\n",
341 nt->enabled ? "started" : "stopped");
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200342 goto out_unlock;
Gao fengd5123482011-10-11 16:08:11 +0000343 }
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700344
Tejun Heo698cf1c2015-06-25 15:01:36 -0700345 if (enabled) { /* true */
Tejun Heoe2f15f92015-06-25 15:01:41 -0700346 if (nt->extended && !(netconsole_ext.flags & CON_ENABLED)) {
347 netconsole_ext.flags |= CON_ENABLED;
348 register_console(&netconsole_ext);
349 }
350
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700351 /*
352 * Skip netpoll_parse_options() -- all the attributes are
353 * already configured via configfs. Just print them out.
354 */
355 netpoll_print_options(&nt->np);
356
357 err = netpoll_setup(&nt->np);
Nikolay Aleksandrovc7c6eff2013-10-24 12:09:24 +0200358 if (err)
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200359 goto out_unlock;
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700360
Joe Perches4a6a97e2017-06-12 16:39:51 -0700361 pr_info("network logging started\n");
Tejun Heo698cf1c2015-06-25 15:01:36 -0700362 } else { /* false */
Nikolay Aleksandrov45e526e2013-10-23 15:04:49 +0200363 /* We need to disable the netconsole before cleaning it up
364 * otherwise we might end up in write_msg() with
Tejun Heo698cf1c2015-06-25 15:01:36 -0700365 * nt->np.dev == NULL and nt->enabled == true
Nikolay Aleksandrov45e526e2013-10-23 15:04:49 +0200366 */
367 spin_lock_irqsave(&target_list_lock, flags);
Tejun Heo698cf1c2015-06-25 15:01:36 -0700368 nt->enabled = false;
Nikolay Aleksandrov45e526e2013-10-23 15:04:49 +0200369 spin_unlock_irqrestore(&target_list_lock, flags);
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700370 netpoll_cleanup(&nt->np);
371 }
372
373 nt->enabled = enabled;
374
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200375 mutex_unlock(&dynamic_netconsole_mutex);
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700376 return strnlen(buf, count);
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200377out_unlock:
378 mutex_unlock(&dynamic_netconsole_mutex);
379 return err;
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700380}
381
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200382static ssize_t extended_store(struct config_item *item, const char *buf,
383 size_t count)
Tejun Heoe2f15f92015-06-25 15:01:41 -0700384{
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200385 struct netconsole_target *nt = to_target(item);
Tejun Heoe2f15f92015-06-25 15:01:41 -0700386 int extended;
387 int err;
388
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200389 mutex_lock(&dynamic_netconsole_mutex);
Tejun Heoe2f15f92015-06-25 15:01:41 -0700390 if (nt->enabled) {
391 pr_err("target (%s) is enabled, disable to update parameters\n",
392 config_item_name(&nt->item));
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200393 err = -EINVAL;
394 goto out_unlock;
Tejun Heoe2f15f92015-06-25 15:01:41 -0700395 }
396
397 err = kstrtoint(buf, 10, &extended);
398 if (err < 0)
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200399 goto out_unlock;
400 if (extended < 0 || extended > 1) {
401 err = -EINVAL;
402 goto out_unlock;
403 }
Tejun Heoe2f15f92015-06-25 15:01:41 -0700404
405 nt->extended = extended;
406
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200407 mutex_unlock(&dynamic_netconsole_mutex);
Tejun Heoe2f15f92015-06-25 15:01:41 -0700408 return strnlen(buf, count);
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200409out_unlock:
410 mutex_unlock(&dynamic_netconsole_mutex);
411 return err;
Tejun Heoe2f15f92015-06-25 15:01:41 -0700412}
413
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200414static ssize_t dev_name_store(struct config_item *item, const char *buf,
415 size_t count)
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700416{
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200417 struct netconsole_target *nt = to_target(item);
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700418 size_t len;
419
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200420 mutex_lock(&dynamic_netconsole_mutex);
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700421 if (nt->enabled) {
Joe Perches22ded572013-10-28 12:53:21 -0700422 pr_err("target (%s) is enabled, disable to update parameters\n",
423 config_item_name(&nt->item));
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200424 mutex_unlock(&dynamic_netconsole_mutex);
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700425 return -EINVAL;
426 }
427
428 strlcpy(nt->np.dev_name, buf, IFNAMSIZ);
429
430 /* Get rid of possible trailing newline from echo(1) */
431 len = strnlen(nt->np.dev_name, IFNAMSIZ);
432 if (nt->np.dev_name[len - 1] == '\n')
433 nt->np.dev_name[len - 1] = '\0';
434
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200435 mutex_unlock(&dynamic_netconsole_mutex);
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700436 return strnlen(buf, count);
437}
438
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200439static ssize_t local_port_store(struct config_item *item, const char *buf,
440 size_t count)
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700441{
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200442 struct netconsole_target *nt = to_target(item);
443 int rv = -EINVAL;
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700444
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200445 mutex_lock(&dynamic_netconsole_mutex);
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700446 if (nt->enabled) {
Joe Perches22ded572013-10-28 12:53:21 -0700447 pr_err("target (%s) is enabled, disable to update parameters\n",
448 config_item_name(&nt->item));
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200449 goto out_unlock;
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700450 }
451
Alexey Dobriyan99f823f2011-05-07 20:33:13 +0000452 rv = kstrtou16(buf, 10, &nt->np.local_port);
453 if (rv < 0)
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200454 goto out_unlock;
455 mutex_unlock(&dynamic_netconsole_mutex);
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700456 return strnlen(buf, count);
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200457out_unlock:
458 mutex_unlock(&dynamic_netconsole_mutex);
459 return rv;
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700460}
461
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200462static ssize_t remote_port_store(struct config_item *item,
463 const char *buf, size_t count)
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700464{
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200465 struct netconsole_target *nt = to_target(item);
466 int rv = -EINVAL;
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700467
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200468 mutex_lock(&dynamic_netconsole_mutex);
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700469 if (nt->enabled) {
Joe Perches22ded572013-10-28 12:53:21 -0700470 pr_err("target (%s) is enabled, disable to update parameters\n",
471 config_item_name(&nt->item));
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200472 goto out_unlock;
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700473 }
474
Alexey Dobriyan99f823f2011-05-07 20:33:13 +0000475 rv = kstrtou16(buf, 10, &nt->np.remote_port);
476 if (rv < 0)
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200477 goto out_unlock;
478 mutex_unlock(&dynamic_netconsole_mutex);
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700479 return strnlen(buf, count);
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200480out_unlock:
481 mutex_unlock(&dynamic_netconsole_mutex);
482 return rv;
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700483}
484
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200485static ssize_t local_ip_store(struct config_item *item, const char *buf,
486 size_t count)
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700487{
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200488 struct netconsole_target *nt = to_target(item);
489
490 mutex_lock(&dynamic_netconsole_mutex);
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700491 if (nt->enabled) {
Joe Perches22ded572013-10-28 12:53:21 -0700492 pr_err("target (%s) is enabled, disable to update parameters\n",
493 config_item_name(&nt->item));
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200494 goto out_unlock;
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700495 }
496
Cong Wangb3d936f2013-01-07 20:52:41 +0000497 if (strnchr(buf, count, ':')) {
498 const char *end;
499 if (in6_pton(buf, count, nt->np.local_ip.in6.s6_addr, -1, &end) > 0) {
500 if (*end && *end != '\n') {
Joe Perches22ded572013-10-28 12:53:21 -0700501 pr_err("invalid IPv6 address at: <%c>\n", *end);
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200502 goto out_unlock;
Cong Wangb3d936f2013-01-07 20:52:41 +0000503 }
504 nt->np.ipv6 = true;
505 } else
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200506 goto out_unlock;
Cong Wangb3d936f2013-01-07 20:52:41 +0000507 } else {
508 if (!nt->np.ipv6) {
509 nt->np.local_ip.ip = in_aton(buf);
510 } else
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200511 goto out_unlock;
Cong Wangb3d936f2013-01-07 20:52:41 +0000512 }
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700513
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200514 mutex_unlock(&dynamic_netconsole_mutex);
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700515 return strnlen(buf, count);
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200516out_unlock:
517 mutex_unlock(&dynamic_netconsole_mutex);
518 return -EINVAL;
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700519}
520
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200521static ssize_t remote_ip_store(struct config_item *item, const char *buf,
522 size_t count)
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700523{
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200524 struct netconsole_target *nt = to_target(item);
525
526 mutex_lock(&dynamic_netconsole_mutex);
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700527 if (nt->enabled) {
Joe Perches22ded572013-10-28 12:53:21 -0700528 pr_err("target (%s) is enabled, disable to update parameters\n",
529 config_item_name(&nt->item));
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200530 goto out_unlock;
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700531 }
532
Cong Wangb3d936f2013-01-07 20:52:41 +0000533 if (strnchr(buf, count, ':')) {
534 const char *end;
535 if (in6_pton(buf, count, nt->np.remote_ip.in6.s6_addr, -1, &end) > 0) {
536 if (*end && *end != '\n') {
Joe Perches22ded572013-10-28 12:53:21 -0700537 pr_err("invalid IPv6 address at: <%c>\n", *end);
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200538 goto out_unlock;
Cong Wangb3d936f2013-01-07 20:52:41 +0000539 }
540 nt->np.ipv6 = true;
541 } else
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200542 goto out_unlock;
Cong Wangb3d936f2013-01-07 20:52:41 +0000543 } else {
544 if (!nt->np.ipv6) {
545 nt->np.remote_ip.ip = in_aton(buf);
546 } else
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200547 goto out_unlock;
Cong Wangb3d936f2013-01-07 20:52:41 +0000548 }
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700549
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200550 mutex_unlock(&dynamic_netconsole_mutex);
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700551 return strnlen(buf, count);
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200552out_unlock:
553 mutex_unlock(&dynamic_netconsole_mutex);
554 return -EINVAL;
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700555}
556
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200557static ssize_t remote_mac_store(struct config_item *item, const char *buf,
558 size_t count)
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700559{
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200560 struct netconsole_target *nt = to_target(item);
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700561 u8 remote_mac[ETH_ALEN];
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700562
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200563 mutex_lock(&dynamic_netconsole_mutex);
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700564 if (nt->enabled) {
Joe Perches22ded572013-10-28 12:53:21 -0700565 pr_err("target (%s) is enabled, disable to update parameters\n",
566 config_item_name(&nt->item));
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200567 goto out_unlock;
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700568 }
569
Alexey Dobriyan4940fc82011-05-07 23:00:07 +0000570 if (!mac_pton(buf, remote_mac))
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200571 goto out_unlock;
Alexey Dobriyan4940fc82011-05-07 23:00:07 +0000572 if (buf[3 * ETH_ALEN - 1] && buf[3 * ETH_ALEN - 1] != '\n')
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200573 goto out_unlock;
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700574 memcpy(nt->np.remote_mac, remote_mac, ETH_ALEN);
575
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200576 mutex_unlock(&dynamic_netconsole_mutex);
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700577 return strnlen(buf, count);
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200578out_unlock:
579 mutex_unlock(&dynamic_netconsole_mutex);
580 return -EINVAL;
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700581}
582
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200583CONFIGFS_ATTR(, enabled);
584CONFIGFS_ATTR(, extended);
585CONFIGFS_ATTR(, dev_name);
586CONFIGFS_ATTR(, local_port);
587CONFIGFS_ATTR(, remote_port);
588CONFIGFS_ATTR(, local_ip);
589CONFIGFS_ATTR(, remote_ip);
590CONFIGFS_ATTR_RO(, local_mac);
591CONFIGFS_ATTR(, remote_mac);
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700592
593static struct configfs_attribute *netconsole_target_attrs[] = {
Christoph Hellwigea9ed9c2015-10-03 15:32:56 +0200594 &attr_enabled,
595 &attr_extended,
596 &attr_dev_name,
597 &attr_local_port,
598 &attr_remote_port,
599 &attr_local_ip,
600 &attr_remote_ip,
601 &attr_local_mac,
602 &attr_remote_mac,
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700603 NULL,
604};
605
606/*
607 * Item operations and type for netconsole_target.
608 */
609
610static void netconsole_target_release(struct config_item *item)
611{
612 kfree(to_target(item));
613}
614
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700615static struct configfs_item_operations netconsole_target_item_ops = {
616 .release = netconsole_target_release,
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700617};
618
619static struct config_item_type netconsole_target_type = {
620 .ct_attrs = netconsole_target_attrs,
621 .ct_item_ops = &netconsole_target_item_ops,
622 .ct_owner = THIS_MODULE,
623};
624
625/*
626 * Group operations and type for netconsole_subsys.
627 */
628
Joel Beckerf89ab862008-07-17 14:53:48 -0700629static struct config_item *make_netconsole_target(struct config_group *group,
630 const char *name)
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700631{
632 unsigned long flags;
633 struct netconsole_target *nt;
634
635 /*
636 * Allocate and initialize with defaults.
Tejun Heo698cf1c2015-06-25 15:01:36 -0700637 * Target is disabled at creation (!enabled).
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700638 */
639 nt = kzalloc(sizeof(*nt), GFP_KERNEL);
Joe Perchese404dec2012-01-29 12:56:23 +0000640 if (!nt)
Joel Beckera6795e92008-07-17 15:21:29 -0700641 return ERR_PTR(-ENOMEM);
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700642
643 nt->np.name = "netconsole";
644 strlcpy(nt->np.dev_name, "eth0", IFNAMSIZ);
645 nt->np.local_port = 6665;
646 nt->np.remote_port = 6666;
Joe Perches1667c942015-03-02 19:54:50 -0800647 eth_broadcast_addr(nt->np.remote_mac);
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700648
649 /* Initialize the config_item member */
650 config_item_init_type_name(&nt->item, name, &netconsole_target_type);
651
652 /* Adding, but it is disabled */
653 spin_lock_irqsave(&target_list_lock, flags);
654 list_add(&nt->list, &target_list);
655 spin_unlock_irqrestore(&target_list_lock, flags);
656
Joel Beckerf89ab862008-07-17 14:53:48 -0700657 return &nt->item;
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700658}
659
660static void drop_netconsole_target(struct config_group *group,
661 struct config_item *item)
662{
663 unsigned long flags;
664 struct netconsole_target *nt = to_target(item);
665
666 spin_lock_irqsave(&target_list_lock, flags);
667 list_del(&nt->list);
668 spin_unlock_irqrestore(&target_list_lock, flags);
669
670 /*
671 * The target may have never been enabled, or was manually disabled
672 * before being removed so netpoll may have already been cleaned up.
673 */
674 if (nt->enabled)
675 netpoll_cleanup(&nt->np);
676
677 config_item_put(&nt->item);
678}
679
680static struct configfs_group_operations netconsole_subsys_group_ops = {
681 .make_item = make_netconsole_target,
682 .drop_item = drop_netconsole_target,
683};
684
685static struct config_item_type netconsole_subsys_type = {
686 .ct_group_ops = &netconsole_subsys_group_ops,
687 .ct_owner = THIS_MODULE,
688};
689
690/* The netconsole configfs subsystem */
691static struct configfs_subsystem netconsole_subsys = {
692 .su_group = {
693 .cg_item = {
694 .ci_namebuf = "netconsole",
695 .ci_type = &netconsole_subsys_type,
696 },
697 },
698};
699
700#endif /* CONFIG_NETCONSOLE_DYNAMIC */
701
Satyam Sharma17951f32007-08-10 15:33:01 -0700702/* Handle network interface device notifications */
703static int netconsole_netdev_event(struct notifier_block *this,
Jiri Pirko351638e2013-05-28 01:30:21 +0000704 unsigned long event, void *ptr)
Satyam Sharma17951f32007-08-10 15:33:01 -0700705{
Satyam Sharmab5427c22007-08-10 15:33:40 -0700706 unsigned long flags;
707 struct netconsole_target *nt;
Jiri Pirko351638e2013-05-28 01:30:21 +0000708 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
Ferenc Wagner141dfba2011-01-06 05:11:19 +0000709 bool stopped = false;
Satyam Sharma17951f32007-08-10 15:33:01 -0700710
WANG Cong0e34e932010-05-06 00:47:21 -0700711 if (!(event == NETDEV_CHANGENAME || event == NETDEV_UNREGISTER ||
Amerigo Wangdaf92092011-05-19 21:39:12 +0000712 event == NETDEV_RELEASE || event == NETDEV_JOIN))
Satyam Sharmab5427c22007-08-10 15:33:40 -0700713 goto done;
Satyam Sharma17951f32007-08-10 15:33:01 -0700714
Satyam Sharmab5427c22007-08-10 15:33:40 -0700715 spin_lock_irqsave(&target_list_lock, flags);
Veaceslav Falico3f315be2013-03-11 00:21:48 +0000716restart:
Satyam Sharmab5427c22007-08-10 15:33:40 -0700717 list_for_each_entry(nt, &target_list, list) {
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700718 netconsole_target_get(nt);
Satyam Sharmab5427c22007-08-10 15:33:40 -0700719 if (nt->np.dev == dev) {
720 switch (event) {
Satyam Sharmab5427c22007-08-10 15:33:40 -0700721 case NETDEV_CHANGENAME:
722 strlcpy(nt->np.dev_name, dev->name, IFNAMSIZ);
723 break;
Amerigo Wangdaf92092011-05-19 21:39:12 +0000724 case NETDEV_RELEASE:
Amerigo Wang8d8fc292011-05-19 21:39:10 +0000725 case NETDEV_JOIN:
Bruno Prémont2382b152009-04-29 20:45:17 +0000726 case NETDEV_UNREGISTER:
Nikolay Aleksandrovc71380f2013-09-19 15:02:36 +0200727 /* rtnl_lock already held
Veaceslav Falico3f315be2013-03-11 00:21:48 +0000728 * we might sleep in __netpoll_cleanup()
Neil Horman3b410a32010-10-13 16:01:52 +0000729 */
Veaceslav Falico3f315be2013-03-11 00:21:48 +0000730 spin_unlock_irqrestore(&target_list_lock, flags);
Dan Aloni7a163bf2013-08-30 13:59:46 +0300731
Veaceslav Falico3f315be2013-03-11 00:21:48 +0000732 __netpoll_cleanup(&nt->np);
Dan Aloni7a163bf2013-08-30 13:59:46 +0300733
Veaceslav Falico3f315be2013-03-11 00:21:48 +0000734 spin_lock_irqsave(&target_list_lock, flags);
735 dev_put(nt->np.dev);
736 nt->np.dev = NULL;
Tejun Heo698cf1c2015-06-25 15:01:36 -0700737 nt->enabled = false;
Ferenc Wagner141dfba2011-01-06 05:11:19 +0000738 stopped = true;
Veaceslav Falico3f315be2013-03-11 00:21:48 +0000739 netconsole_target_put(nt);
740 goto restart;
Satyam Sharmab5427c22007-08-10 15:33:40 -0700741 }
Satyam Sharma17951f32007-08-10 15:33:01 -0700742 }
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700743 netconsole_target_put(nt);
Satyam Sharma17951f32007-08-10 15:33:01 -0700744 }
Satyam Sharmab5427c22007-08-10 15:33:40 -0700745 spin_unlock_irqrestore(&target_list_lock, flags);
Amerigo Wang8d8fc292011-05-19 21:39:10 +0000746 if (stopped) {
Joe Perches22ded572013-10-28 12:53:21 -0700747 const char *msg = "had an event";
Amerigo Wang8d8fc292011-05-19 21:39:10 +0000748 switch (event) {
749 case NETDEV_UNREGISTER:
Joe Perches22ded572013-10-28 12:53:21 -0700750 msg = "unregistered";
Amerigo Wang8d8fc292011-05-19 21:39:10 +0000751 break;
Amerigo Wangdaf92092011-05-19 21:39:12 +0000752 case NETDEV_RELEASE:
Joe Perches22ded572013-10-28 12:53:21 -0700753 msg = "released slaves";
Amerigo Wang8d8fc292011-05-19 21:39:10 +0000754 break;
755 case NETDEV_JOIN:
Joe Perches22ded572013-10-28 12:53:21 -0700756 msg = "is joining a master device";
Amerigo Wang8d8fc292011-05-19 21:39:10 +0000757 break;
758 }
Joe Perches22ded572013-10-28 12:53:21 -0700759 pr_info("network logging stopped on interface %s as it %s\n",
760 dev->name, msg);
Amerigo Wang8d8fc292011-05-19 21:39:10 +0000761 }
Satyam Sharma17951f32007-08-10 15:33:01 -0700762
Satyam Sharmab5427c22007-08-10 15:33:40 -0700763done:
Satyam Sharma17951f32007-08-10 15:33:01 -0700764 return NOTIFY_DONE;
765}
766
767static struct notifier_block netconsole_netdev_notifier = {
768 .notifier_call = netconsole_netdev_event,
769};
770
Tejun Heoe2f15f92015-06-25 15:01:41 -0700771/**
772 * send_ext_msg_udp - send extended log message to target
773 * @nt: target to send message to
774 * @msg: extended log message to send
775 * @msg_len: length of message
776 *
777 * Transfer extended log @msg to @nt. If @msg is longer than
778 * MAX_PRINT_CHUNK, it'll be split and transmitted in multiple chunks with
779 * ncfrag header field added to identify them.
780 */
781static void send_ext_msg_udp(struct netconsole_target *nt, const char *msg,
782 int msg_len)
783{
784 static char buf[MAX_PRINT_CHUNK]; /* protected by target_list_lock */
785 const char *header, *body;
786 int offset = 0;
787 int header_len, body_len;
788
789 if (msg_len <= MAX_PRINT_CHUNK) {
790 netpoll_send_udp(&nt->np, msg, msg_len);
791 return;
792 }
793
794 /* need to insert extra header fields, detect header and body */
795 header = msg;
796 body = memchr(msg, ';', msg_len);
797 if (WARN_ON_ONCE(!body))
798 return;
799
800 header_len = body - header;
801 body_len = msg_len - header_len - 1;
802 body++;
803
804 /*
805 * Transfer multiple chunks with the following extra header.
806 * "ncfrag=<byte-offset>/<total-bytes>"
807 */
808 memcpy(buf, header, header_len);
809
810 while (offset < body_len) {
811 int this_header = header_len;
812 int this_chunk;
813
814 this_header += scnprintf(buf + this_header,
815 sizeof(buf) - this_header,
816 ",ncfrag=%d/%d;", offset, body_len);
817
818 this_chunk = min(body_len - offset,
819 MAX_PRINT_CHUNK - this_header);
820 if (WARN_ON_ONCE(this_chunk <= 0))
821 return;
822
823 memcpy(buf + this_header, body + offset, this_chunk);
824
825 netpoll_send_udp(&nt->np, buf, this_header + this_chunk);
826
827 offset += this_chunk;
828 }
829}
830
831static void write_ext_msg(struct console *con, const char *msg,
832 unsigned int len)
833{
834 struct netconsole_target *nt;
835 unsigned long flags;
836
837 if ((oops_only && !oops_in_progress) || list_empty(&target_list))
838 return;
839
840 spin_lock_irqsave(&target_list_lock, flags);
841 list_for_each_entry(nt, &target_list, list)
842 if (nt->extended && nt->enabled && netif_running(nt->np.dev))
843 send_ext_msg_udp(nt, msg, len);
844 spin_unlock_irqrestore(&target_list_lock, flags);
845}
846
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847static void write_msg(struct console *con, const char *msg, unsigned int len)
848{
849 int frag, left;
850 unsigned long flags;
Satyam Sharmab5427c22007-08-10 15:33:40 -0700851 struct netconsole_target *nt;
852 const char *tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853
Amerigo Wangc1a60852012-11-08 03:42:38 +0000854 if (oops_only && !oops_in_progress)
855 return;
Satyam Sharmab5427c22007-08-10 15:33:40 -0700856 /* Avoid taking lock and disabling interrupts unnecessarily */
857 if (list_empty(&target_list))
858 return;
859
860 spin_lock_irqsave(&target_list_lock, flags);
861 list_for_each_entry(nt, &target_list, list) {
Tejun Heoe2f15f92015-06-25 15:01:41 -0700862 if (!nt->extended && nt->enabled && netif_running(nt->np.dev)) {
Satyam Sharmab5427c22007-08-10 15:33:40 -0700863 /*
864 * We nest this inside the for-each-target loop above
865 * so that we're able to get as much logging out to
866 * at least one target if we die inside here, instead
867 * of unnecessarily keeping all targets in lock-step.
868 */
869 tmp = msg;
870 for (left = len; left;) {
871 frag = min(left, MAX_PRINT_CHUNK);
872 netpoll_send_udp(&nt->np, tmp, frag);
873 tmp += frag;
874 left -= frag;
875 }
Satyam Sharma0cc120be2007-08-10 15:30:31 -0700876 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877 }
Satyam Sharmab5427c22007-08-10 15:33:40 -0700878 spin_unlock_irqrestore(&target_list_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879}
880
Tejun Heoe2f15f92015-06-25 15:01:41 -0700881static struct console netconsole_ext = {
882 .name = "netcon_ext",
883 .flags = CON_EXTENDED, /* starts disabled, registered on first use */
884 .write = write_ext_msg,
885};
886
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887static struct console netconsole = {
Satyam Sharmad39badf2007-08-10 15:27:24 -0700888 .name = "netcon",
Michael Ellerman0517dee2008-04-15 00:49:04 -0700889 .flags = CON_ENABLED,
Satyam Sharmad39badf2007-08-10 15:27:24 -0700890 .write = write_msg,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891};
892
Satyam Sharmad39badf2007-08-10 15:27:24 -0700893static int __init init_netconsole(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894{
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700895 int err;
Satyam Sharmab5427c22007-08-10 15:33:40 -0700896 struct netconsole_target *nt, *tmp;
897 unsigned long flags;
898 char *target_config;
899 char *input = config;
Stephen Hemmingerb41848b2006-10-26 15:46:52 -0700900
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700901 if (strnlen(input, MAX_PARAM_LENGTH)) {
902 while ((target_config = strsep(&input, ";"))) {
903 nt = alloc_param_target(target_config);
904 if (IS_ERR(nt)) {
905 err = PTR_ERR(nt);
906 goto fail;
907 }
Michael Ellerman0517dee2008-04-15 00:49:04 -0700908 /* Dump existing printks when we register */
Tejun Heoe2f15f92015-06-25 15:01:41 -0700909 if (nt->extended)
910 netconsole_ext.flags |= CON_PRINTBUFFER |
911 CON_ENABLED;
912 else
913 netconsole.flags |= CON_PRINTBUFFER;
Michael Ellerman0517dee2008-04-15 00:49:04 -0700914
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700915 spin_lock_irqsave(&target_list_lock, flags);
916 list_add(&nt->list, &target_list);
917 spin_unlock_irqrestore(&target_list_lock, flags);
Satyam Sharmab5427c22007-08-10 15:33:40 -0700918 }
Satyam Sharmab5427c22007-08-10 15:33:40 -0700919 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920
Satyam Sharma17951f32007-08-10 15:33:01 -0700921 err = register_netdevice_notifier(&netconsole_netdev_notifier);
922 if (err)
Satyam Sharmab5427c22007-08-10 15:33:40 -0700923 goto fail;
Satyam Sharma17951f32007-08-10 15:33:01 -0700924
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700925 err = dynamic_netconsole_init();
926 if (err)
927 goto undonotifier;
928
Tejun Heoe2f15f92015-06-25 15:01:41 -0700929 if (netconsole_ext.flags & CON_ENABLED)
930 register_console(&netconsole_ext);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931 register_console(&netconsole);
Joe Perches22ded572013-10-28 12:53:21 -0700932 pr_info("network logging started\n");
Satyam Sharmad39badf2007-08-10 15:27:24 -0700933
Satyam Sharmad39badf2007-08-10 15:27:24 -0700934 return err;
Satyam Sharmab5427c22007-08-10 15:33:40 -0700935
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700936undonotifier:
937 unregister_netdevice_notifier(&netconsole_netdev_notifier);
938
Satyam Sharmab5427c22007-08-10 15:33:40 -0700939fail:
Joe Perches22ded572013-10-28 12:53:21 -0700940 pr_err("cleaning up\n");
Satyam Sharmab5427c22007-08-10 15:33:40 -0700941
942 /*
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700943 * Remove all targets and destroy them (only targets created
944 * from the boot/module option exist here). Skipping the list
Satyam Sharmab5427c22007-08-10 15:33:40 -0700945 * lock is safe here, and netpoll_cleanup() will sleep.
946 */
947 list_for_each_entry_safe(nt, tmp, &target_list, list) {
948 list_del(&nt->list);
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700949 free_param_target(nt);
Satyam Sharmab5427c22007-08-10 15:33:40 -0700950 }
951
952 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953}
954
Satyam Sharmad39badf2007-08-10 15:27:24 -0700955static void __exit cleanup_netconsole(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956{
Satyam Sharmab5427c22007-08-10 15:33:40 -0700957 struct netconsole_target *nt, *tmp;
Satyam Sharmadf180e32007-08-10 15:32:14 -0700958
Tejun Heoe2f15f92015-06-25 15:01:41 -0700959 unregister_console(&netconsole_ext);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700960 unregister_console(&netconsole);
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700961 dynamic_netconsole_exit();
Satyam Sharma17951f32007-08-10 15:33:01 -0700962 unregister_netdevice_notifier(&netconsole_netdev_notifier);
Satyam Sharmab5427c22007-08-10 15:33:40 -0700963
964 /*
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700965 * Targets created via configfs pin references on our module
966 * and would first be rmdir(2)'ed from userspace. We reach
967 * here only when they are already destroyed, and only those
968 * created from the boot/module option are left, so remove and
969 * destroy them. Skipping the list lock is safe here, and
970 * netpoll_cleanup() will sleep.
Satyam Sharmab5427c22007-08-10 15:33:40 -0700971 */
972 list_for_each_entry_safe(nt, tmp, &target_list, list) {
973 list_del(&nt->list);
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700974 free_param_target(nt);
Satyam Sharmab5427c22007-08-10 15:33:40 -0700975 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976}
977
Lin Ming97c7de02011-09-20 15:45:07 -0400978/*
979 * Use late_initcall to ensure netconsole is
980 * initialized after network device driver if built-in.
981 *
982 * late_initcall() and module_init() are identical if built as module.
983 */
984late_initcall(init_netconsole);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700985module_exit(cleanup_netconsole);