Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | #include <linux/init.h> |
| 39 | #include <linux/module.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 40 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | #include <linux/console.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | #include <linux/moduleparam.h> |
Andy Shevchenko | 4cd5773 | 2013-06-04 19:46:26 +0300 | [diff] [blame] | 43 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | #include <linux/string.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | #include <linux/netpoll.h> |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 46 | #include <linux/inet.h> |
| 47 | #include <linux/configfs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | |
| 49 | MODULE_AUTHOR("Maintainer: Matt Mackall <mpm@selenic.com>"); |
| 50 | MODULE_DESCRIPTION("Console driver for network interfaces"); |
| 51 | MODULE_LICENSE("GPL"); |
| 52 | |
Satyam Sharma | d39badf | 2007-08-10 15:27:24 -0700 | [diff] [blame] | 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); |
Niels de Vos | 61a2d07 | 2008-07-31 00:07:23 -0700 | [diff] [blame] | 58 | MODULE_PARM_DESC(netconsole, " netconsole=[src-port]@[src-ip]/[dev],[tgt-port]@<tgt-ip>/[tgt-macaddr]"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | |
Amerigo Wang | c1a6085 | 2012-11-08 03:42:38 +0000 | [diff] [blame] | 60 | static bool oops_only = false; |
| 61 | module_param(oops_only, bool, 0600); |
| 62 | MODULE_PARM_DESC(oops_only, "Only log oops messages"); |
| 63 | |
Satyam Sharma | d2b6088 | 2007-08-10 15:29:47 -0700 | [diff] [blame] | 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 | |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 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 | |
Satyam Sharma | df180e3 | 2007-08-10 15:32:14 -0700 | [diff] [blame] | 79 | /** |
| 80 | * struct netconsole_target - Represents a configured netconsole target. |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 81 | * @list: Links this target into the target_list. |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 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). |
Satyam Sharma | df180e3 | 2007-08-10 15:32:14 -0700 | [diff] [blame] | 89 | * @np: The netpoll structure for this target. |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 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) |
Satyam Sharma | df180e3 | 2007-08-10 15:32:14 -0700 | [diff] [blame] | 98 | */ |
| 99 | struct netconsole_target { |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 100 | struct list_head list; |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 101 | #ifdef CONFIG_NETCONSOLE_DYNAMIC |
| 102 | struct config_item item; |
| 103 | #endif |
| 104 | int enabled; |
Dan Aloni | 7a163bf | 2013-08-30 13:59:46 +0300 | [diff] [blame] | 105 | struct mutex mutex; |
Satyam Sharma | df180e3 | 2007-08-10 15:32:14 -0700 | [diff] [blame] | 106 | struct netpoll np; |
| 107 | }; |
| 108 | |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 109 | #ifdef CONFIG_NETCONSOLE_DYNAMIC |
| 110 | |
| 111 | static struct configfs_subsystem netconsole_subsys; |
| 112 | |
| 113 | static int __init dynamic_netconsole_init(void) |
| 114 | { |
| 115 | config_group_init(&netconsole_subsys.su_group); |
| 116 | mutex_init(&netconsole_subsys.su_mutex); |
| 117 | return configfs_register_subsystem(&netconsole_subsys); |
| 118 | } |
| 119 | |
| 120 | static void __exit dynamic_netconsole_exit(void) |
| 121 | { |
| 122 | configfs_unregister_subsystem(&netconsole_subsys); |
| 123 | } |
| 124 | |
| 125 | /* |
| 126 | * Targets that were created by parsing the boot/module option string |
| 127 | * do not exist in the configfs hierarchy (and have NULL names) and will |
| 128 | * never go away, so make these a no-op for them. |
| 129 | */ |
| 130 | static void netconsole_target_get(struct netconsole_target *nt) |
| 131 | { |
| 132 | if (config_item_name(&nt->item)) |
| 133 | config_item_get(&nt->item); |
| 134 | } |
| 135 | |
| 136 | static void netconsole_target_put(struct netconsole_target *nt) |
| 137 | { |
| 138 | if (config_item_name(&nt->item)) |
| 139 | config_item_put(&nt->item); |
| 140 | } |
| 141 | |
| 142 | #else /* !CONFIG_NETCONSOLE_DYNAMIC */ |
| 143 | |
| 144 | static int __init dynamic_netconsole_init(void) |
| 145 | { |
| 146 | return 0; |
| 147 | } |
| 148 | |
| 149 | static void __exit dynamic_netconsole_exit(void) |
| 150 | { |
| 151 | } |
| 152 | |
| 153 | /* |
| 154 | * No danger of targets going away from under us when dynamic |
| 155 | * reconfigurability is off. |
| 156 | */ |
| 157 | static void netconsole_target_get(struct netconsole_target *nt) |
| 158 | { |
| 159 | } |
| 160 | |
| 161 | static void netconsole_target_put(struct netconsole_target *nt) |
| 162 | { |
| 163 | } |
| 164 | |
| 165 | #endif /* CONFIG_NETCONSOLE_DYNAMIC */ |
| 166 | |
| 167 | /* Allocate new target (from boot/module param) and setup netpoll for it */ |
| 168 | static struct netconsole_target *alloc_param_target(char *target_config) |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 169 | { |
| 170 | int err = -ENOMEM; |
| 171 | struct netconsole_target *nt; |
| 172 | |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 173 | /* |
| 174 | * Allocate and initialize with defaults. |
| 175 | * Note that these targets get their config_item fields zeroed-out. |
| 176 | */ |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 177 | nt = kzalloc(sizeof(*nt), GFP_KERNEL); |
Joe Perches | e404dec | 2012-01-29 12:56:23 +0000 | [diff] [blame] | 178 | if (!nt) |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 179 | goto fail; |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 180 | |
| 181 | nt->np.name = "netconsole"; |
| 182 | strlcpy(nt->np.dev_name, "eth0", IFNAMSIZ); |
| 183 | nt->np.local_port = 6665; |
| 184 | nt->np.remote_port = 6666; |
Dan Aloni | 7a163bf | 2013-08-30 13:59:46 +0300 | [diff] [blame] | 185 | mutex_init(&nt->mutex); |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 186 | memset(nt->np.remote_mac, 0xff, ETH_ALEN); |
| 187 | |
| 188 | /* Parse parameters and setup netpoll */ |
| 189 | err = netpoll_parse_options(&nt->np, target_config); |
| 190 | if (err) |
| 191 | goto fail; |
| 192 | |
| 193 | err = netpoll_setup(&nt->np); |
| 194 | if (err) |
| 195 | goto fail; |
| 196 | |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 197 | nt->enabled = 1; |
| 198 | |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 199 | return nt; |
| 200 | |
| 201 | fail: |
| 202 | kfree(nt); |
| 203 | return ERR_PTR(err); |
| 204 | } |
| 205 | |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 206 | /* Cleanup netpoll for given target (from boot/module param) and free it */ |
| 207 | static void free_param_target(struct netconsole_target *nt) |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 208 | { |
| 209 | netpoll_cleanup(&nt->np); |
| 210 | kfree(nt); |
| 211 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 213 | #ifdef CONFIG_NETCONSOLE_DYNAMIC |
| 214 | |
| 215 | /* |
| 216 | * Our subsystem hierarchy is: |
| 217 | * |
| 218 | * /sys/kernel/config/netconsole/ |
| 219 | * | |
| 220 | * <target>/ |
| 221 | * | enabled |
| 222 | * | dev_name |
| 223 | * | local_port |
| 224 | * | remote_port |
| 225 | * | local_ip |
| 226 | * | remote_ip |
| 227 | * | local_mac |
| 228 | * | remote_mac |
| 229 | * | |
| 230 | * <target>/... |
| 231 | */ |
| 232 | |
| 233 | struct netconsole_target_attr { |
| 234 | struct configfs_attribute attr; |
| 235 | ssize_t (*show)(struct netconsole_target *nt, |
| 236 | char *buf); |
| 237 | ssize_t (*store)(struct netconsole_target *nt, |
| 238 | const char *buf, |
| 239 | size_t count); |
| 240 | }; |
| 241 | |
| 242 | static struct netconsole_target *to_target(struct config_item *item) |
| 243 | { |
| 244 | return item ? |
| 245 | container_of(item, struct netconsole_target, item) : |
| 246 | NULL; |
| 247 | } |
| 248 | |
| 249 | /* |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 250 | * Attribute operations for netconsole_target. |
| 251 | */ |
| 252 | |
| 253 | static ssize_t show_enabled(struct netconsole_target *nt, char *buf) |
| 254 | { |
| 255 | return snprintf(buf, PAGE_SIZE, "%d\n", nt->enabled); |
| 256 | } |
| 257 | |
| 258 | static ssize_t show_dev_name(struct netconsole_target *nt, char *buf) |
| 259 | { |
| 260 | return snprintf(buf, PAGE_SIZE, "%s\n", nt->np.dev_name); |
| 261 | } |
| 262 | |
| 263 | static ssize_t show_local_port(struct netconsole_target *nt, char *buf) |
| 264 | { |
| 265 | return snprintf(buf, PAGE_SIZE, "%d\n", nt->np.local_port); |
| 266 | } |
| 267 | |
| 268 | static ssize_t show_remote_port(struct netconsole_target *nt, char *buf) |
| 269 | { |
| 270 | return snprintf(buf, PAGE_SIZE, "%d\n", nt->np.remote_port); |
| 271 | } |
| 272 | |
| 273 | static ssize_t show_local_ip(struct netconsole_target *nt, char *buf) |
| 274 | { |
Cong Wang | b3d936f | 2013-01-07 20:52:41 +0000 | [diff] [blame] | 275 | if (nt->np.ipv6) |
| 276 | return snprintf(buf, PAGE_SIZE, "%pI6c\n", &nt->np.local_ip.in6); |
| 277 | else |
Cong Wang | b7394d2 | 2013-01-07 20:52:39 +0000 | [diff] [blame] | 278 | return snprintf(buf, PAGE_SIZE, "%pI4\n", &nt->np.local_ip); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 279 | } |
| 280 | |
| 281 | static ssize_t show_remote_ip(struct netconsole_target *nt, char *buf) |
| 282 | { |
Cong Wang | b3d936f | 2013-01-07 20:52:41 +0000 | [diff] [blame] | 283 | if (nt->np.ipv6) |
| 284 | return snprintf(buf, PAGE_SIZE, "%pI6c\n", &nt->np.remote_ip.in6); |
| 285 | else |
Cong Wang | b7394d2 | 2013-01-07 20:52:39 +0000 | [diff] [blame] | 286 | return snprintf(buf, PAGE_SIZE, "%pI4\n", &nt->np.remote_ip); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 287 | } |
| 288 | |
| 289 | static ssize_t show_local_mac(struct netconsole_target *nt, char *buf) |
| 290 | { |
Stephen Hemminger | 0953864 | 2007-11-19 19:23:29 -0800 | [diff] [blame] | 291 | struct net_device *dev = nt->np.dev; |
Johannes Berg | e174961 | 2008-10-27 15:59:26 -0700 | [diff] [blame] | 292 | static const u8 bcast[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; |
Stephen Hemminger | 0953864 | 2007-11-19 19:23:29 -0800 | [diff] [blame] | 293 | |
Johannes Berg | e174961 | 2008-10-27 15:59:26 -0700 | [diff] [blame] | 294 | return snprintf(buf, PAGE_SIZE, "%pM\n", dev ? dev->dev_addr : bcast); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 295 | } |
| 296 | |
| 297 | static ssize_t show_remote_mac(struct netconsole_target *nt, char *buf) |
| 298 | { |
Johannes Berg | e174961 | 2008-10-27 15:59:26 -0700 | [diff] [blame] | 299 | return snprintf(buf, PAGE_SIZE, "%pM\n", nt->np.remote_mac); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 300 | } |
| 301 | |
| 302 | /* |
| 303 | * This one is special -- targets created through the configfs interface |
| 304 | * are not enabled (and the corresponding netpoll activated) by default. |
| 305 | * The user is expected to set the desired parameters first (which |
| 306 | * would enable him to dynamically add new netpoll targets for new |
| 307 | * network interfaces as and when they come up). |
| 308 | */ |
| 309 | static ssize_t store_enabled(struct netconsole_target *nt, |
| 310 | const char *buf, |
| 311 | size_t count) |
| 312 | { |
Nikolay Aleksandrov | 45e526e | 2013-10-23 15:04:49 +0200 | [diff] [blame] | 313 | unsigned long flags; |
Alexey Dobriyan | 99f823f | 2011-05-07 20:33:13 +0000 | [diff] [blame] | 314 | int enabled; |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 315 | int err; |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 316 | |
Alexey Dobriyan | 99f823f | 2011-05-07 20:33:13 +0000 | [diff] [blame] | 317 | err = kstrtoint(buf, 10, &enabled); |
| 318 | if (err < 0) |
| 319 | return err; |
| 320 | if (enabled < 0 || enabled > 1) |
| 321 | return -EINVAL; |
Gao feng | d512348 | 2011-10-11 16:08:11 +0000 | [diff] [blame] | 322 | if (enabled == nt->enabled) { |
| 323 | printk(KERN_INFO "netconsole: network logging has already %s\n", |
| 324 | nt->enabled ? "started" : "stopped"); |
| 325 | return -EINVAL; |
| 326 | } |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 327 | |
| 328 | if (enabled) { /* 1 */ |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 329 | /* |
| 330 | * Skip netpoll_parse_options() -- all the attributes are |
| 331 | * already configured via configfs. Just print them out. |
| 332 | */ |
| 333 | netpoll_print_options(&nt->np); |
| 334 | |
| 335 | err = netpoll_setup(&nt->np); |
Nikolay Aleksandrov | c7c6eff | 2013-10-24 12:09:24 +0200 | [diff] [blame] | 336 | if (err) |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 337 | return err; |
| 338 | |
| 339 | printk(KERN_INFO "netconsole: network logging started\n"); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 340 | } else { /* 0 */ |
Nikolay Aleksandrov | 45e526e | 2013-10-23 15:04:49 +0200 | [diff] [blame] | 341 | /* We need to disable the netconsole before cleaning it up |
| 342 | * otherwise we might end up in write_msg() with |
| 343 | * nt->np.dev == NULL and nt->enabled == 1 |
| 344 | */ |
| 345 | spin_lock_irqsave(&target_list_lock, flags); |
| 346 | nt->enabled = 0; |
| 347 | spin_unlock_irqrestore(&target_list_lock, flags); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 348 | netpoll_cleanup(&nt->np); |
| 349 | } |
| 350 | |
| 351 | nt->enabled = enabled; |
| 352 | |
| 353 | return strnlen(buf, count); |
| 354 | } |
| 355 | |
| 356 | static ssize_t store_dev_name(struct netconsole_target *nt, |
| 357 | const char *buf, |
| 358 | size_t count) |
| 359 | { |
| 360 | size_t len; |
| 361 | |
| 362 | if (nt->enabled) { |
| 363 | printk(KERN_ERR "netconsole: target (%s) is enabled, " |
| 364 | "disable to update parameters\n", |
| 365 | config_item_name(&nt->item)); |
| 366 | return -EINVAL; |
| 367 | } |
| 368 | |
| 369 | strlcpy(nt->np.dev_name, buf, IFNAMSIZ); |
| 370 | |
| 371 | /* Get rid of possible trailing newline from echo(1) */ |
| 372 | len = strnlen(nt->np.dev_name, IFNAMSIZ); |
| 373 | if (nt->np.dev_name[len - 1] == '\n') |
| 374 | nt->np.dev_name[len - 1] = '\0'; |
| 375 | |
| 376 | return strnlen(buf, count); |
| 377 | } |
| 378 | |
| 379 | static ssize_t store_local_port(struct netconsole_target *nt, |
| 380 | const char *buf, |
| 381 | size_t count) |
| 382 | { |
Alexey Dobriyan | 99f823f | 2011-05-07 20:33:13 +0000 | [diff] [blame] | 383 | int rv; |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 384 | |
| 385 | if (nt->enabled) { |
| 386 | printk(KERN_ERR "netconsole: target (%s) is enabled, " |
| 387 | "disable to update parameters\n", |
| 388 | config_item_name(&nt->item)); |
| 389 | return -EINVAL; |
| 390 | } |
| 391 | |
Alexey Dobriyan | 99f823f | 2011-05-07 20:33:13 +0000 | [diff] [blame] | 392 | rv = kstrtou16(buf, 10, &nt->np.local_port); |
| 393 | if (rv < 0) |
| 394 | return rv; |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 395 | return strnlen(buf, count); |
| 396 | } |
| 397 | |
| 398 | static ssize_t store_remote_port(struct netconsole_target *nt, |
| 399 | const char *buf, |
| 400 | size_t count) |
| 401 | { |
Alexey Dobriyan | 99f823f | 2011-05-07 20:33:13 +0000 | [diff] [blame] | 402 | int rv; |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 403 | |
| 404 | if (nt->enabled) { |
| 405 | printk(KERN_ERR "netconsole: target (%s) is enabled, " |
| 406 | "disable to update parameters\n", |
| 407 | config_item_name(&nt->item)); |
| 408 | return -EINVAL; |
| 409 | } |
| 410 | |
Alexey Dobriyan | 99f823f | 2011-05-07 20:33:13 +0000 | [diff] [blame] | 411 | rv = kstrtou16(buf, 10, &nt->np.remote_port); |
| 412 | if (rv < 0) |
| 413 | return rv; |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 414 | return strnlen(buf, count); |
| 415 | } |
| 416 | |
| 417 | static ssize_t store_local_ip(struct netconsole_target *nt, |
| 418 | const char *buf, |
| 419 | size_t count) |
| 420 | { |
| 421 | if (nt->enabled) { |
| 422 | printk(KERN_ERR "netconsole: target (%s) is enabled, " |
| 423 | "disable to update parameters\n", |
| 424 | config_item_name(&nt->item)); |
| 425 | return -EINVAL; |
| 426 | } |
| 427 | |
Cong Wang | b3d936f | 2013-01-07 20:52:41 +0000 | [diff] [blame] | 428 | if (strnchr(buf, count, ':')) { |
| 429 | const char *end; |
| 430 | if (in6_pton(buf, count, nt->np.local_ip.in6.s6_addr, -1, &end) > 0) { |
| 431 | if (*end && *end != '\n') { |
| 432 | printk(KERN_ERR "netconsole: invalid IPv6 address at: <%c>\n", *end); |
| 433 | return -EINVAL; |
| 434 | } |
| 435 | nt->np.ipv6 = true; |
| 436 | } else |
| 437 | return -EINVAL; |
| 438 | } else { |
| 439 | if (!nt->np.ipv6) { |
| 440 | nt->np.local_ip.ip = in_aton(buf); |
| 441 | } else |
| 442 | return -EINVAL; |
| 443 | } |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 444 | |
| 445 | return strnlen(buf, count); |
| 446 | } |
| 447 | |
| 448 | static ssize_t store_remote_ip(struct netconsole_target *nt, |
| 449 | const char *buf, |
| 450 | size_t count) |
| 451 | { |
| 452 | if (nt->enabled) { |
| 453 | printk(KERN_ERR "netconsole: target (%s) is enabled, " |
| 454 | "disable to update parameters\n", |
| 455 | config_item_name(&nt->item)); |
| 456 | return -EINVAL; |
| 457 | } |
| 458 | |
Cong Wang | b3d936f | 2013-01-07 20:52:41 +0000 | [diff] [blame] | 459 | if (strnchr(buf, count, ':')) { |
| 460 | const char *end; |
| 461 | if (in6_pton(buf, count, nt->np.remote_ip.in6.s6_addr, -1, &end) > 0) { |
| 462 | if (*end && *end != '\n') { |
| 463 | printk(KERN_ERR "netconsole: invalid IPv6 address at: <%c>\n", *end); |
| 464 | return -EINVAL; |
| 465 | } |
| 466 | nt->np.ipv6 = true; |
| 467 | } else |
| 468 | return -EINVAL; |
| 469 | } else { |
| 470 | if (!nt->np.ipv6) { |
| 471 | nt->np.remote_ip.ip = in_aton(buf); |
| 472 | } else |
| 473 | return -EINVAL; |
| 474 | } |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 475 | |
| 476 | return strnlen(buf, count); |
| 477 | } |
| 478 | |
| 479 | static ssize_t store_remote_mac(struct netconsole_target *nt, |
| 480 | const char *buf, |
| 481 | size_t count) |
| 482 | { |
| 483 | u8 remote_mac[ETH_ALEN]; |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 484 | |
| 485 | if (nt->enabled) { |
| 486 | printk(KERN_ERR "netconsole: target (%s) is enabled, " |
| 487 | "disable to update parameters\n", |
| 488 | config_item_name(&nt->item)); |
| 489 | return -EINVAL; |
| 490 | } |
| 491 | |
Alexey Dobriyan | 4940fc8 | 2011-05-07 23:00:07 +0000 | [diff] [blame] | 492 | if (!mac_pton(buf, remote_mac)) |
| 493 | return -EINVAL; |
| 494 | if (buf[3 * ETH_ALEN - 1] && buf[3 * ETH_ALEN - 1] != '\n') |
| 495 | return -EINVAL; |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 496 | memcpy(nt->np.remote_mac, remote_mac, ETH_ALEN); |
| 497 | |
| 498 | return strnlen(buf, count); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 499 | } |
| 500 | |
| 501 | /* |
| 502 | * Attribute definitions for netconsole_target. |
| 503 | */ |
| 504 | |
| 505 | #define NETCONSOLE_TARGET_ATTR_RO(_name) \ |
| 506 | static struct netconsole_target_attr netconsole_target_##_name = \ |
| 507 | __CONFIGFS_ATTR(_name, S_IRUGO, show_##_name, NULL) |
| 508 | |
| 509 | #define NETCONSOLE_TARGET_ATTR_RW(_name) \ |
| 510 | static struct netconsole_target_attr netconsole_target_##_name = \ |
| 511 | __CONFIGFS_ATTR(_name, S_IRUGO | S_IWUSR, show_##_name, store_##_name) |
| 512 | |
| 513 | NETCONSOLE_TARGET_ATTR_RW(enabled); |
| 514 | NETCONSOLE_TARGET_ATTR_RW(dev_name); |
| 515 | NETCONSOLE_TARGET_ATTR_RW(local_port); |
| 516 | NETCONSOLE_TARGET_ATTR_RW(remote_port); |
| 517 | NETCONSOLE_TARGET_ATTR_RW(local_ip); |
| 518 | NETCONSOLE_TARGET_ATTR_RW(remote_ip); |
| 519 | NETCONSOLE_TARGET_ATTR_RO(local_mac); |
| 520 | NETCONSOLE_TARGET_ATTR_RW(remote_mac); |
| 521 | |
| 522 | static struct configfs_attribute *netconsole_target_attrs[] = { |
| 523 | &netconsole_target_enabled.attr, |
| 524 | &netconsole_target_dev_name.attr, |
| 525 | &netconsole_target_local_port.attr, |
| 526 | &netconsole_target_remote_port.attr, |
| 527 | &netconsole_target_local_ip.attr, |
| 528 | &netconsole_target_remote_ip.attr, |
| 529 | &netconsole_target_local_mac.attr, |
| 530 | &netconsole_target_remote_mac.attr, |
| 531 | NULL, |
| 532 | }; |
| 533 | |
| 534 | /* |
| 535 | * Item operations and type for netconsole_target. |
| 536 | */ |
| 537 | |
| 538 | static void netconsole_target_release(struct config_item *item) |
| 539 | { |
| 540 | kfree(to_target(item)); |
| 541 | } |
| 542 | |
| 543 | static ssize_t netconsole_target_attr_show(struct config_item *item, |
| 544 | struct configfs_attribute *attr, |
| 545 | char *buf) |
| 546 | { |
| 547 | ssize_t ret = -EINVAL; |
| 548 | struct netconsole_target *nt = to_target(item); |
| 549 | struct netconsole_target_attr *na = |
| 550 | container_of(attr, struct netconsole_target_attr, attr); |
| 551 | |
| 552 | if (na->show) |
| 553 | ret = na->show(nt, buf); |
| 554 | |
| 555 | return ret; |
| 556 | } |
| 557 | |
| 558 | static ssize_t netconsole_target_attr_store(struct config_item *item, |
| 559 | struct configfs_attribute *attr, |
| 560 | const char *buf, |
| 561 | size_t count) |
| 562 | { |
| 563 | ssize_t ret = -EINVAL; |
| 564 | struct netconsole_target *nt = to_target(item); |
| 565 | struct netconsole_target_attr *na = |
| 566 | container_of(attr, struct netconsole_target_attr, attr); |
| 567 | |
Nikolay Aleksandrov | c7c6eff | 2013-10-24 12:09:24 +0200 | [diff] [blame] | 568 | mutex_lock(&nt->mutex); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 569 | if (na->store) |
| 570 | ret = na->store(nt, buf, count); |
Nikolay Aleksandrov | c7c6eff | 2013-10-24 12:09:24 +0200 | [diff] [blame] | 571 | mutex_unlock(&nt->mutex); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 572 | |
| 573 | return ret; |
| 574 | } |
| 575 | |
| 576 | static struct configfs_item_operations netconsole_target_item_ops = { |
| 577 | .release = netconsole_target_release, |
| 578 | .show_attribute = netconsole_target_attr_show, |
| 579 | .store_attribute = netconsole_target_attr_store, |
| 580 | }; |
| 581 | |
| 582 | static struct config_item_type netconsole_target_type = { |
| 583 | .ct_attrs = netconsole_target_attrs, |
| 584 | .ct_item_ops = &netconsole_target_item_ops, |
| 585 | .ct_owner = THIS_MODULE, |
| 586 | }; |
| 587 | |
| 588 | /* |
| 589 | * Group operations and type for netconsole_subsys. |
| 590 | */ |
| 591 | |
Joel Becker | f89ab86 | 2008-07-17 14:53:48 -0700 | [diff] [blame] | 592 | static struct config_item *make_netconsole_target(struct config_group *group, |
| 593 | const char *name) |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 594 | { |
| 595 | unsigned long flags; |
| 596 | struct netconsole_target *nt; |
| 597 | |
| 598 | /* |
| 599 | * Allocate and initialize with defaults. |
| 600 | * Target is disabled at creation (enabled == 0). |
| 601 | */ |
| 602 | nt = kzalloc(sizeof(*nt), GFP_KERNEL); |
Joe Perches | e404dec | 2012-01-29 12:56:23 +0000 | [diff] [blame] | 603 | if (!nt) |
Joel Becker | a6795e9 | 2008-07-17 15:21:29 -0700 | [diff] [blame] | 604 | return ERR_PTR(-ENOMEM); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 605 | |
| 606 | nt->np.name = "netconsole"; |
| 607 | strlcpy(nt->np.dev_name, "eth0", IFNAMSIZ); |
| 608 | nt->np.local_port = 6665; |
| 609 | nt->np.remote_port = 6666; |
Dan Aloni | 7a163bf | 2013-08-30 13:59:46 +0300 | [diff] [blame] | 610 | mutex_init(&nt->mutex); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 611 | memset(nt->np.remote_mac, 0xff, ETH_ALEN); |
| 612 | |
| 613 | /* Initialize the config_item member */ |
| 614 | config_item_init_type_name(&nt->item, name, &netconsole_target_type); |
| 615 | |
| 616 | /* Adding, but it is disabled */ |
| 617 | spin_lock_irqsave(&target_list_lock, flags); |
| 618 | list_add(&nt->list, &target_list); |
| 619 | spin_unlock_irqrestore(&target_list_lock, flags); |
| 620 | |
Joel Becker | f89ab86 | 2008-07-17 14:53:48 -0700 | [diff] [blame] | 621 | return &nt->item; |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 622 | } |
| 623 | |
| 624 | static void drop_netconsole_target(struct config_group *group, |
| 625 | struct config_item *item) |
| 626 | { |
| 627 | unsigned long flags; |
| 628 | struct netconsole_target *nt = to_target(item); |
| 629 | |
| 630 | spin_lock_irqsave(&target_list_lock, flags); |
| 631 | list_del(&nt->list); |
| 632 | spin_unlock_irqrestore(&target_list_lock, flags); |
| 633 | |
| 634 | /* |
| 635 | * The target may have never been enabled, or was manually disabled |
| 636 | * before being removed so netpoll may have already been cleaned up. |
| 637 | */ |
| 638 | if (nt->enabled) |
| 639 | netpoll_cleanup(&nt->np); |
| 640 | |
| 641 | config_item_put(&nt->item); |
| 642 | } |
| 643 | |
| 644 | static struct configfs_group_operations netconsole_subsys_group_ops = { |
| 645 | .make_item = make_netconsole_target, |
| 646 | .drop_item = drop_netconsole_target, |
| 647 | }; |
| 648 | |
| 649 | static struct config_item_type netconsole_subsys_type = { |
| 650 | .ct_group_ops = &netconsole_subsys_group_ops, |
| 651 | .ct_owner = THIS_MODULE, |
| 652 | }; |
| 653 | |
| 654 | /* The netconsole configfs subsystem */ |
| 655 | static struct configfs_subsystem netconsole_subsys = { |
| 656 | .su_group = { |
| 657 | .cg_item = { |
| 658 | .ci_namebuf = "netconsole", |
| 659 | .ci_type = &netconsole_subsys_type, |
| 660 | }, |
| 661 | }, |
| 662 | }; |
| 663 | |
| 664 | #endif /* CONFIG_NETCONSOLE_DYNAMIC */ |
| 665 | |
Satyam Sharma | 17951f3 | 2007-08-10 15:33:01 -0700 | [diff] [blame] | 666 | /* Handle network interface device notifications */ |
| 667 | static int netconsole_netdev_event(struct notifier_block *this, |
Jiri Pirko | 351638e | 2013-05-28 01:30:21 +0000 | [diff] [blame] | 668 | unsigned long event, void *ptr) |
Satyam Sharma | 17951f3 | 2007-08-10 15:33:01 -0700 | [diff] [blame] | 669 | { |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 670 | unsigned long flags; |
| 671 | struct netconsole_target *nt; |
Jiri Pirko | 351638e | 2013-05-28 01:30:21 +0000 | [diff] [blame] | 672 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
Ferenc Wagner | 141dfba | 2011-01-06 05:11:19 +0000 | [diff] [blame] | 673 | bool stopped = false; |
Satyam Sharma | 17951f3 | 2007-08-10 15:33:01 -0700 | [diff] [blame] | 674 | |
WANG Cong | 0e34e93 | 2010-05-06 00:47:21 -0700 | [diff] [blame] | 675 | if (!(event == NETDEV_CHANGENAME || event == NETDEV_UNREGISTER || |
Amerigo Wang | daf9209 | 2011-05-19 21:39:12 +0000 | [diff] [blame] | 676 | event == NETDEV_RELEASE || event == NETDEV_JOIN)) |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 677 | goto done; |
Satyam Sharma | 17951f3 | 2007-08-10 15:33:01 -0700 | [diff] [blame] | 678 | |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 679 | spin_lock_irqsave(&target_list_lock, flags); |
Veaceslav Falico | 3f315be | 2013-03-11 00:21:48 +0000 | [diff] [blame] | 680 | restart: |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 681 | list_for_each_entry(nt, &target_list, list) { |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 682 | netconsole_target_get(nt); |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 683 | if (nt->np.dev == dev) { |
| 684 | switch (event) { |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 685 | case NETDEV_CHANGENAME: |
| 686 | strlcpy(nt->np.dev_name, dev->name, IFNAMSIZ); |
| 687 | break; |
Amerigo Wang | daf9209 | 2011-05-19 21:39:12 +0000 | [diff] [blame] | 688 | case NETDEV_RELEASE: |
Amerigo Wang | 8d8fc29 | 2011-05-19 21:39:10 +0000 | [diff] [blame] | 689 | case NETDEV_JOIN: |
Bruno Prémont | 2382b15 | 2009-04-29 20:45:17 +0000 | [diff] [blame] | 690 | case NETDEV_UNREGISTER: |
Nikolay Aleksandrov | c71380f | 2013-09-19 15:02:36 +0200 | [diff] [blame] | 691 | /* rtnl_lock already held |
Veaceslav Falico | 3f315be | 2013-03-11 00:21:48 +0000 | [diff] [blame] | 692 | * we might sleep in __netpoll_cleanup() |
Neil Horman | 3b410a3 | 2010-10-13 16:01:52 +0000 | [diff] [blame] | 693 | */ |
Veaceslav Falico | 3f315be | 2013-03-11 00:21:48 +0000 | [diff] [blame] | 694 | spin_unlock_irqrestore(&target_list_lock, flags); |
Dan Aloni | 7a163bf | 2013-08-30 13:59:46 +0300 | [diff] [blame] | 695 | |
Veaceslav Falico | 3f315be | 2013-03-11 00:21:48 +0000 | [diff] [blame] | 696 | __netpoll_cleanup(&nt->np); |
Dan Aloni | 7a163bf | 2013-08-30 13:59:46 +0300 | [diff] [blame] | 697 | |
Veaceslav Falico | 3f315be | 2013-03-11 00:21:48 +0000 | [diff] [blame] | 698 | spin_lock_irqsave(&target_list_lock, flags); |
| 699 | dev_put(nt->np.dev); |
| 700 | nt->np.dev = NULL; |
Bruno Prémont | 2382b15 | 2009-04-29 20:45:17 +0000 | [diff] [blame] | 701 | nt->enabled = 0; |
Ferenc Wagner | 141dfba | 2011-01-06 05:11:19 +0000 | [diff] [blame] | 702 | stopped = true; |
Veaceslav Falico | 3f315be | 2013-03-11 00:21:48 +0000 | [diff] [blame] | 703 | netconsole_target_put(nt); |
| 704 | goto restart; |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 705 | } |
Satyam Sharma | 17951f3 | 2007-08-10 15:33:01 -0700 | [diff] [blame] | 706 | } |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 707 | netconsole_target_put(nt); |
Satyam Sharma | 17951f3 | 2007-08-10 15:33:01 -0700 | [diff] [blame] | 708 | } |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 709 | spin_unlock_irqrestore(&target_list_lock, flags); |
Amerigo Wang | 8d8fc29 | 2011-05-19 21:39:10 +0000 | [diff] [blame] | 710 | if (stopped) { |
Ferenc Wagner | 38cfb90 | 2011-01-06 05:11:20 +0000 | [diff] [blame] | 711 | printk(KERN_INFO "netconsole: network logging stopped on " |
Amerigo Wang | 8d8fc29 | 2011-05-19 21:39:10 +0000 | [diff] [blame] | 712 | "interface %s as it ", dev->name); |
| 713 | switch (event) { |
| 714 | case NETDEV_UNREGISTER: |
| 715 | printk(KERN_CONT "unregistered\n"); |
| 716 | break; |
Amerigo Wang | daf9209 | 2011-05-19 21:39:12 +0000 | [diff] [blame] | 717 | case NETDEV_RELEASE: |
Amerigo Wang | 8d8fc29 | 2011-05-19 21:39:10 +0000 | [diff] [blame] | 718 | printk(KERN_CONT "released slaves\n"); |
| 719 | break; |
| 720 | case NETDEV_JOIN: |
| 721 | printk(KERN_CONT "is joining a master device\n"); |
| 722 | break; |
| 723 | } |
| 724 | } |
Satyam Sharma | 17951f3 | 2007-08-10 15:33:01 -0700 | [diff] [blame] | 725 | |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 726 | done: |
Satyam Sharma | 17951f3 | 2007-08-10 15:33:01 -0700 | [diff] [blame] | 727 | return NOTIFY_DONE; |
| 728 | } |
| 729 | |
| 730 | static struct notifier_block netconsole_netdev_notifier = { |
| 731 | .notifier_call = netconsole_netdev_event, |
| 732 | }; |
| 733 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | static void write_msg(struct console *con, const char *msg, unsigned int len) |
| 735 | { |
| 736 | int frag, left; |
| 737 | unsigned long flags; |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 738 | struct netconsole_target *nt; |
| 739 | const char *tmp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | |
Amerigo Wang | c1a6085 | 2012-11-08 03:42:38 +0000 | [diff] [blame] | 741 | if (oops_only && !oops_in_progress) |
| 742 | return; |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 743 | /* Avoid taking lock and disabling interrupts unnecessarily */ |
| 744 | if (list_empty(&target_list)) |
| 745 | return; |
| 746 | |
| 747 | spin_lock_irqsave(&target_list_lock, flags); |
| 748 | list_for_each_entry(nt, &target_list, list) { |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 749 | netconsole_target_get(nt); |
| 750 | if (nt->enabled && netif_running(nt->np.dev)) { |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 751 | /* |
| 752 | * We nest this inside the for-each-target loop above |
| 753 | * so that we're able to get as much logging out to |
| 754 | * at least one target if we die inside here, instead |
| 755 | * of unnecessarily keeping all targets in lock-step. |
| 756 | */ |
| 757 | tmp = msg; |
| 758 | for (left = len; left;) { |
| 759 | frag = min(left, MAX_PRINT_CHUNK); |
| 760 | netpoll_send_udp(&nt->np, tmp, frag); |
| 761 | tmp += frag; |
| 762 | left -= frag; |
| 763 | } |
Satyam Sharma | 0cc120be | 2007-08-10 15:30:31 -0700 | [diff] [blame] | 764 | } |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 765 | netconsole_target_put(nt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | } |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 767 | spin_unlock_irqrestore(&target_list_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | } |
| 769 | |
| 770 | static struct console netconsole = { |
Satyam Sharma | d39badf | 2007-08-10 15:27:24 -0700 | [diff] [blame] | 771 | .name = "netcon", |
Michael Ellerman | 0517dee | 2008-04-15 00:49:04 -0700 | [diff] [blame] | 772 | .flags = CON_ENABLED, |
Satyam Sharma | d39badf | 2007-08-10 15:27:24 -0700 | [diff] [blame] | 773 | .write = write_msg, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | }; |
| 775 | |
Satyam Sharma | d39badf | 2007-08-10 15:27:24 -0700 | [diff] [blame] | 776 | static int __init init_netconsole(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | { |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 778 | int err; |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 779 | struct netconsole_target *nt, *tmp; |
| 780 | unsigned long flags; |
| 781 | char *target_config; |
| 782 | char *input = config; |
Stephen Hemminger | b41848b | 2006-10-26 15:46:52 -0700 | [diff] [blame] | 783 | |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 784 | if (strnlen(input, MAX_PARAM_LENGTH)) { |
| 785 | while ((target_config = strsep(&input, ";"))) { |
| 786 | nt = alloc_param_target(target_config); |
| 787 | if (IS_ERR(nt)) { |
| 788 | err = PTR_ERR(nt); |
| 789 | goto fail; |
| 790 | } |
Michael Ellerman | 0517dee | 2008-04-15 00:49:04 -0700 | [diff] [blame] | 791 | /* Dump existing printks when we register */ |
| 792 | netconsole.flags |= CON_PRINTBUFFER; |
| 793 | |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 794 | spin_lock_irqsave(&target_list_lock, flags); |
| 795 | list_add(&nt->list, &target_list); |
| 796 | spin_unlock_irqrestore(&target_list_lock, flags); |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 797 | } |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 798 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | |
Satyam Sharma | 17951f3 | 2007-08-10 15:33:01 -0700 | [diff] [blame] | 800 | err = register_netdevice_notifier(&netconsole_netdev_notifier); |
| 801 | if (err) |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 802 | goto fail; |
Satyam Sharma | 17951f3 | 2007-08-10 15:33:01 -0700 | [diff] [blame] | 803 | |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 804 | err = dynamic_netconsole_init(); |
| 805 | if (err) |
| 806 | goto undonotifier; |
| 807 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | register_console(&netconsole); |
| 809 | printk(KERN_INFO "netconsole: network logging started\n"); |
Satyam Sharma | d39badf | 2007-08-10 15:27:24 -0700 | [diff] [blame] | 810 | |
Satyam Sharma | d39badf | 2007-08-10 15:27:24 -0700 | [diff] [blame] | 811 | return err; |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 812 | |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 813 | undonotifier: |
| 814 | unregister_netdevice_notifier(&netconsole_netdev_notifier); |
| 815 | |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 816 | fail: |
| 817 | printk(KERN_ERR "netconsole: cleaning up\n"); |
| 818 | |
| 819 | /* |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 820 | * Remove all targets and destroy them (only targets created |
| 821 | * from the boot/module option exist here). Skipping the list |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 822 | * lock is safe here, and netpoll_cleanup() will sleep. |
| 823 | */ |
| 824 | list_for_each_entry_safe(nt, tmp, &target_list, list) { |
| 825 | list_del(&nt->list); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 826 | free_param_target(nt); |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 827 | } |
| 828 | |
| 829 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | } |
| 831 | |
Satyam Sharma | d39badf | 2007-08-10 15:27:24 -0700 | [diff] [blame] | 832 | static void __exit cleanup_netconsole(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | { |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 834 | struct netconsole_target *nt, *tmp; |
Satyam Sharma | df180e3 | 2007-08-10 15:32:14 -0700 | [diff] [blame] | 835 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | unregister_console(&netconsole); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 837 | dynamic_netconsole_exit(); |
Satyam Sharma | 17951f3 | 2007-08-10 15:33:01 -0700 | [diff] [blame] | 838 | unregister_netdevice_notifier(&netconsole_netdev_notifier); |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 839 | |
| 840 | /* |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 841 | * Targets created via configfs pin references on our module |
| 842 | * and would first be rmdir(2)'ed from userspace. We reach |
| 843 | * here only when they are already destroyed, and only those |
| 844 | * created from the boot/module option are left, so remove and |
| 845 | * destroy them. Skipping the list lock is safe here, and |
| 846 | * netpoll_cleanup() will sleep. |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 847 | */ |
| 848 | list_for_each_entry_safe(nt, tmp, &target_list, list) { |
| 849 | list_del(&nt->list); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 850 | free_param_target(nt); |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 851 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | } |
| 853 | |
Lin Ming | 97c7de0 | 2011-09-20 15:45:07 -0400 | [diff] [blame] | 854 | /* |
| 855 | * Use late_initcall to ensure netconsole is |
| 856 | * initialized after network device driver if built-in. |
| 857 | * |
| 858 | * late_initcall() and module_init() are identical if built as module. |
| 859 | */ |
| 860 | late_initcall(init_netconsole); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | module_exit(cleanup_netconsole); |