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 | |
Joe Perches | 22ded57 | 2013-10-28 12:53:21 -0700 | [diff] [blame] | 37 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 38 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | #include <linux/mm.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | #include <linux/init.h> |
| 41 | #include <linux/module.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 42 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | #include <linux/console.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | #include <linux/moduleparam.h> |
Andy Shevchenko | 4cd5773 | 2013-06-04 19:46:26 +0300 | [diff] [blame] | 45 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | #include <linux/string.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | #include <linux/netpoll.h> |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 48 | #include <linux/inet.h> |
| 49 | #include <linux/configfs.h> |
Joe Perches | 1667c94 | 2015-03-02 19:54:50 -0800 | [diff] [blame] | 50 | #include <linux/etherdevice.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | |
| 52 | MODULE_AUTHOR("Maintainer: Matt Mackall <mpm@selenic.com>"); |
| 53 | MODULE_DESCRIPTION("Console driver for network interfaces"); |
| 54 | MODULE_LICENSE("GPL"); |
| 55 | |
Satyam Sharma | d39badf | 2007-08-10 15:27:24 -0700 | [diff] [blame] | 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); |
Niels de Vos | 61a2d07 | 2008-07-31 00:07:23 -0700 | [diff] [blame] | 61 | 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] | 62 | |
Amerigo Wang | c1a6085 | 2012-11-08 03:42:38 +0000 | [diff] [blame] | 63 | static bool oops_only = false; |
| 64 | module_param(oops_only, bool, 0600); |
| 65 | MODULE_PARM_DESC(oops_only, "Only log oops messages"); |
| 66 | |
Satyam Sharma | d2b6088 | 2007-08-10 15:29:47 -0700 | [diff] [blame] | 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 | |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 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 | |
Tejun Heo | e2f15f9 | 2015-06-25 15:01:41 -0700 | [diff] [blame] | 82 | /* |
| 83 | * Console driver for extended netconsoles. Registered on the first use to |
| 84 | * avoid unnecessarily enabling ext message formatting. |
| 85 | */ |
| 86 | static struct console netconsole_ext; |
| 87 | |
Satyam Sharma | df180e3 | 2007-08-10 15:32:14 -0700 | [diff] [blame] | 88 | /** |
| 89 | * struct netconsole_target - Represents a configured netconsole target. |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 90 | * @list: Links this target into the target_list. |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 91 | * @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 Sharma | df180e3 | 2007-08-10 15:32:14 -0700 | [diff] [blame] | 98 | * @np: The netpoll structure for this target. |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 99 | * 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 Sharma | df180e3 | 2007-08-10 15:32:14 -0700 | [diff] [blame] | 107 | */ |
| 108 | struct netconsole_target { |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 109 | struct list_head list; |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 110 | #ifdef CONFIG_NETCONSOLE_DYNAMIC |
| 111 | struct config_item item; |
| 112 | #endif |
Tejun Heo | 698cf1c | 2015-06-25 15:01:36 -0700 | [diff] [blame] | 113 | bool enabled; |
Tejun Heo | e2f15f9 | 2015-06-25 15:01:41 -0700 | [diff] [blame] | 114 | bool extended; |
Satyam Sharma | df180e3 | 2007-08-10 15:32:14 -0700 | [diff] [blame] | 115 | struct netpoll np; |
| 116 | }; |
| 117 | |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 118 | #ifdef CONFIG_NETCONSOLE_DYNAMIC |
| 119 | |
| 120 | static struct configfs_subsystem netconsole_subsys; |
Tejun Heo | 369e5a8 | 2015-06-25 15:01:38 -0700 | [diff] [blame] | 121 | static DEFINE_MUTEX(dynamic_netconsole_mutex); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 122 | |
| 123 | static 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 | |
| 130 | static 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 | */ |
| 140 | static void netconsole_target_get(struct netconsole_target *nt) |
| 141 | { |
| 142 | if (config_item_name(&nt->item)) |
| 143 | config_item_get(&nt->item); |
| 144 | } |
| 145 | |
| 146 | static 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 | |
| 154 | static int __init dynamic_netconsole_init(void) |
| 155 | { |
| 156 | return 0; |
| 157 | } |
| 158 | |
| 159 | static 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 | */ |
| 167 | static void netconsole_target_get(struct netconsole_target *nt) |
| 168 | { |
| 169 | } |
| 170 | |
| 171 | static 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 */ |
| 178 | static struct netconsole_target *alloc_param_target(char *target_config) |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 179 | { |
| 180 | int err = -ENOMEM; |
| 181 | struct netconsole_target *nt; |
| 182 | |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 183 | /* |
| 184 | * Allocate and initialize with defaults. |
| 185 | * Note that these targets get their config_item fields zeroed-out. |
| 186 | */ |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 187 | nt = kzalloc(sizeof(*nt), GFP_KERNEL); |
Joe Perches | e404dec | 2012-01-29 12:56:23 +0000 | [diff] [blame] | 188 | if (!nt) |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 189 | goto fail; |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 190 | |
| 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 Perches | 1667c94 | 2015-03-02 19:54:50 -0800 | [diff] [blame] | 195 | eth_broadcast_addr(nt->np.remote_mac); |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 196 | |
Tejun Heo | e2f15f9 | 2015-06-25 15:01:41 -0700 | [diff] [blame] | 197 | if (*target_config == '+') { |
| 198 | nt->extended = true; |
| 199 | target_config++; |
| 200 | } |
| 201 | |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 202 | /* 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 Heo | 698cf1c | 2015-06-25 15:01:36 -0700 | [diff] [blame] | 211 | nt->enabled = true; |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 212 | |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 213 | return nt; |
| 214 | |
| 215 | fail: |
| 216 | kfree(nt); |
| 217 | return ERR_PTR(err); |
| 218 | } |
| 219 | |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 220 | /* Cleanup netpoll for given target (from boot/module param) and free it */ |
| 221 | static void free_param_target(struct netconsole_target *nt) |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 222 | { |
| 223 | netpoll_cleanup(&nt->np); |
| 224 | kfree(nt); |
| 225 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 227 | #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 Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 247 | static 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 Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 255 | * Attribute operations for netconsole_target. |
| 256 | */ |
| 257 | |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 258 | static ssize_t enabled_show(struct config_item *item, char *buf) |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 259 | { |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 260 | return snprintf(buf, PAGE_SIZE, "%d\n", to_target(item)->enabled); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 261 | } |
| 262 | |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 263 | static ssize_t extended_show(struct config_item *item, char *buf) |
Tejun Heo | e2f15f9 | 2015-06-25 15:01:41 -0700 | [diff] [blame] | 264 | { |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 265 | return snprintf(buf, PAGE_SIZE, "%d\n", to_target(item)->extended); |
Tejun Heo | e2f15f9 | 2015-06-25 15:01:41 -0700 | [diff] [blame] | 266 | } |
| 267 | |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 268 | static ssize_t dev_name_show(struct config_item *item, char *buf) |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 269 | { |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 270 | return snprintf(buf, PAGE_SIZE, "%s\n", to_target(item)->np.dev_name); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 271 | } |
| 272 | |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 273 | static ssize_t local_port_show(struct config_item *item, char *buf) |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 274 | { |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 275 | return snprintf(buf, PAGE_SIZE, "%d\n", to_target(item)->np.local_port); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 276 | } |
| 277 | |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 278 | static ssize_t remote_port_show(struct config_item *item, char *buf) |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 279 | { |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 280 | return snprintf(buf, PAGE_SIZE, "%d\n", to_target(item)->np.remote_port); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 281 | } |
| 282 | |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 283 | static ssize_t local_ip_show(struct config_item *item, char *buf) |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 284 | { |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 285 | struct netconsole_target *nt = to_target(item); |
| 286 | |
Cong Wang | b3d936f | 2013-01-07 20:52:41 +0000 | [diff] [blame] | 287 | if (nt->np.ipv6) |
| 288 | return snprintf(buf, PAGE_SIZE, "%pI6c\n", &nt->np.local_ip.in6); |
| 289 | else |
Cong Wang | b7394d2 | 2013-01-07 20:52:39 +0000 | [diff] [blame] | 290 | return snprintf(buf, PAGE_SIZE, "%pI4\n", &nt->np.local_ip); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 291 | } |
| 292 | |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 293 | static ssize_t remote_ip_show(struct config_item *item, char *buf) |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 294 | { |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 295 | struct netconsole_target *nt = to_target(item); |
| 296 | |
Cong Wang | b3d936f | 2013-01-07 20:52:41 +0000 | [diff] [blame] | 297 | if (nt->np.ipv6) |
| 298 | return snprintf(buf, PAGE_SIZE, "%pI6c\n", &nt->np.remote_ip.in6); |
| 299 | else |
Cong Wang | b7394d2 | 2013-01-07 20:52:39 +0000 | [diff] [blame] | 300 | return snprintf(buf, PAGE_SIZE, "%pI4\n", &nt->np.remote_ip); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 301 | } |
| 302 | |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 303 | static ssize_t local_mac_show(struct config_item *item, char *buf) |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 304 | { |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 305 | struct net_device *dev = to_target(item)->np.dev; |
Johannes Berg | e174961 | 2008-10-27 15:59:26 -0700 | [diff] [blame] | 306 | static const u8 bcast[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; |
Stephen Hemminger | 0953864 | 2007-11-19 19:23:29 -0800 | [diff] [blame] | 307 | |
Johannes Berg | e174961 | 2008-10-27 15:59:26 -0700 | [diff] [blame] | 308 | return snprintf(buf, PAGE_SIZE, "%pM\n", dev ? dev->dev_addr : bcast); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 309 | } |
| 310 | |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 311 | static ssize_t remote_mac_show(struct config_item *item, char *buf) |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 312 | { |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 313 | return snprintf(buf, PAGE_SIZE, "%pM\n", to_target(item)->np.remote_mac); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 314 | } |
| 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 Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 323 | static ssize_t enabled_store(struct config_item *item, |
| 324 | const char *buf, size_t count) |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 325 | { |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 326 | struct netconsole_target *nt = to_target(item); |
Nikolay Aleksandrov | 45e526e | 2013-10-23 15:04:49 +0200 | [diff] [blame] | 327 | unsigned long flags; |
Alexey Dobriyan | 99f823f | 2011-05-07 20:33:13 +0000 | [diff] [blame] | 328 | int enabled; |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 329 | int err; |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 330 | |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 331 | mutex_lock(&dynamic_netconsole_mutex); |
Alexey Dobriyan | 99f823f | 2011-05-07 20:33:13 +0000 | [diff] [blame] | 332 | err = kstrtoint(buf, 10, &enabled); |
| 333 | if (err < 0) |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 334 | goto out_unlock; |
| 335 | |
| 336 | err = -EINVAL; |
Alexey Dobriyan | 99f823f | 2011-05-07 20:33:13 +0000 | [diff] [blame] | 337 | if (enabled < 0 || enabled > 1) |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 338 | goto out_unlock; |
Tejun Heo | 698cf1c | 2015-06-25 15:01:36 -0700 | [diff] [blame] | 339 | if ((bool)enabled == nt->enabled) { |
Joe Perches | 22ded57 | 2013-10-28 12:53:21 -0700 | [diff] [blame] | 340 | pr_info("network logging has already %s\n", |
| 341 | nt->enabled ? "started" : "stopped"); |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 342 | goto out_unlock; |
Gao feng | d512348 | 2011-10-11 16:08:11 +0000 | [diff] [blame] | 343 | } |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 344 | |
Tejun Heo | 698cf1c | 2015-06-25 15:01:36 -0700 | [diff] [blame] | 345 | if (enabled) { /* true */ |
Tejun Heo | e2f15f9 | 2015-06-25 15:01:41 -0700 | [diff] [blame] | 346 | if (nt->extended && !(netconsole_ext.flags & CON_ENABLED)) { |
| 347 | netconsole_ext.flags |= CON_ENABLED; |
| 348 | register_console(&netconsole_ext); |
| 349 | } |
| 350 | |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 351 | /* |
| 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 Aleksandrov | c7c6eff | 2013-10-24 12:09:24 +0200 | [diff] [blame] | 358 | if (err) |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 359 | goto out_unlock; |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 360 | |
Joe Perches | 4a6a97e | 2017-06-12 16:39:51 -0700 | [diff] [blame] | 361 | pr_info("network logging started\n"); |
Tejun Heo | 698cf1c | 2015-06-25 15:01:36 -0700 | [diff] [blame] | 362 | } else { /* false */ |
Nikolay Aleksandrov | 45e526e | 2013-10-23 15:04:49 +0200 | [diff] [blame] | 363 | /* We need to disable the netconsole before cleaning it up |
| 364 | * otherwise we might end up in write_msg() with |
Tejun Heo | 698cf1c | 2015-06-25 15:01:36 -0700 | [diff] [blame] | 365 | * nt->np.dev == NULL and nt->enabled == true |
Nikolay Aleksandrov | 45e526e | 2013-10-23 15:04:49 +0200 | [diff] [blame] | 366 | */ |
| 367 | spin_lock_irqsave(&target_list_lock, flags); |
Tejun Heo | 698cf1c | 2015-06-25 15:01:36 -0700 | [diff] [blame] | 368 | nt->enabled = false; |
Nikolay Aleksandrov | 45e526e | 2013-10-23 15:04:49 +0200 | [diff] [blame] | 369 | spin_unlock_irqrestore(&target_list_lock, flags); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 370 | netpoll_cleanup(&nt->np); |
| 371 | } |
| 372 | |
| 373 | nt->enabled = enabled; |
| 374 | |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 375 | mutex_unlock(&dynamic_netconsole_mutex); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 376 | return strnlen(buf, count); |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 377 | out_unlock: |
| 378 | mutex_unlock(&dynamic_netconsole_mutex); |
| 379 | return err; |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 380 | } |
| 381 | |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 382 | static ssize_t extended_store(struct config_item *item, const char *buf, |
| 383 | size_t count) |
Tejun Heo | e2f15f9 | 2015-06-25 15:01:41 -0700 | [diff] [blame] | 384 | { |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 385 | struct netconsole_target *nt = to_target(item); |
Tejun Heo | e2f15f9 | 2015-06-25 15:01:41 -0700 | [diff] [blame] | 386 | int extended; |
| 387 | int err; |
| 388 | |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 389 | mutex_lock(&dynamic_netconsole_mutex); |
Tejun Heo | e2f15f9 | 2015-06-25 15:01:41 -0700 | [diff] [blame] | 390 | if (nt->enabled) { |
| 391 | pr_err("target (%s) is enabled, disable to update parameters\n", |
| 392 | config_item_name(&nt->item)); |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 393 | err = -EINVAL; |
| 394 | goto out_unlock; |
Tejun Heo | e2f15f9 | 2015-06-25 15:01:41 -0700 | [diff] [blame] | 395 | } |
| 396 | |
| 397 | err = kstrtoint(buf, 10, &extended); |
| 398 | if (err < 0) |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 399 | goto out_unlock; |
| 400 | if (extended < 0 || extended > 1) { |
| 401 | err = -EINVAL; |
| 402 | goto out_unlock; |
| 403 | } |
Tejun Heo | e2f15f9 | 2015-06-25 15:01:41 -0700 | [diff] [blame] | 404 | |
| 405 | nt->extended = extended; |
| 406 | |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 407 | mutex_unlock(&dynamic_netconsole_mutex); |
Tejun Heo | e2f15f9 | 2015-06-25 15:01:41 -0700 | [diff] [blame] | 408 | return strnlen(buf, count); |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 409 | out_unlock: |
| 410 | mutex_unlock(&dynamic_netconsole_mutex); |
| 411 | return err; |
Tejun Heo | e2f15f9 | 2015-06-25 15:01:41 -0700 | [diff] [blame] | 412 | } |
| 413 | |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 414 | static ssize_t dev_name_store(struct config_item *item, const char *buf, |
| 415 | size_t count) |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 416 | { |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 417 | struct netconsole_target *nt = to_target(item); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 418 | size_t len; |
| 419 | |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 420 | mutex_lock(&dynamic_netconsole_mutex); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 421 | if (nt->enabled) { |
Joe Perches | 22ded57 | 2013-10-28 12:53:21 -0700 | [diff] [blame] | 422 | pr_err("target (%s) is enabled, disable to update parameters\n", |
| 423 | config_item_name(&nt->item)); |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 424 | mutex_unlock(&dynamic_netconsole_mutex); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 425 | 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 Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 435 | mutex_unlock(&dynamic_netconsole_mutex); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 436 | return strnlen(buf, count); |
| 437 | } |
| 438 | |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 439 | static ssize_t local_port_store(struct config_item *item, const char *buf, |
| 440 | size_t count) |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 441 | { |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 442 | struct netconsole_target *nt = to_target(item); |
| 443 | int rv = -EINVAL; |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 444 | |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 445 | mutex_lock(&dynamic_netconsole_mutex); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 446 | if (nt->enabled) { |
Joe Perches | 22ded57 | 2013-10-28 12:53:21 -0700 | [diff] [blame] | 447 | pr_err("target (%s) is enabled, disable to update parameters\n", |
| 448 | config_item_name(&nt->item)); |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 449 | goto out_unlock; |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 450 | } |
| 451 | |
Alexey Dobriyan | 99f823f | 2011-05-07 20:33:13 +0000 | [diff] [blame] | 452 | rv = kstrtou16(buf, 10, &nt->np.local_port); |
| 453 | if (rv < 0) |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 454 | goto out_unlock; |
| 455 | mutex_unlock(&dynamic_netconsole_mutex); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 456 | return strnlen(buf, count); |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 457 | out_unlock: |
| 458 | mutex_unlock(&dynamic_netconsole_mutex); |
| 459 | return rv; |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 460 | } |
| 461 | |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 462 | static ssize_t remote_port_store(struct config_item *item, |
| 463 | const char *buf, size_t count) |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 464 | { |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 465 | struct netconsole_target *nt = to_target(item); |
| 466 | int rv = -EINVAL; |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 467 | |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 468 | mutex_lock(&dynamic_netconsole_mutex); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 469 | if (nt->enabled) { |
Joe Perches | 22ded57 | 2013-10-28 12:53:21 -0700 | [diff] [blame] | 470 | pr_err("target (%s) is enabled, disable to update parameters\n", |
| 471 | config_item_name(&nt->item)); |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 472 | goto out_unlock; |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 473 | } |
| 474 | |
Alexey Dobriyan | 99f823f | 2011-05-07 20:33:13 +0000 | [diff] [blame] | 475 | rv = kstrtou16(buf, 10, &nt->np.remote_port); |
| 476 | if (rv < 0) |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 477 | goto out_unlock; |
| 478 | mutex_unlock(&dynamic_netconsole_mutex); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 479 | return strnlen(buf, count); |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 480 | out_unlock: |
| 481 | mutex_unlock(&dynamic_netconsole_mutex); |
| 482 | return rv; |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 483 | } |
| 484 | |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 485 | static ssize_t local_ip_store(struct config_item *item, const char *buf, |
| 486 | size_t count) |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 487 | { |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 488 | struct netconsole_target *nt = to_target(item); |
| 489 | |
| 490 | mutex_lock(&dynamic_netconsole_mutex); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 491 | if (nt->enabled) { |
Joe Perches | 22ded57 | 2013-10-28 12:53:21 -0700 | [diff] [blame] | 492 | pr_err("target (%s) is enabled, disable to update parameters\n", |
| 493 | config_item_name(&nt->item)); |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 494 | goto out_unlock; |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 495 | } |
| 496 | |
Cong Wang | b3d936f | 2013-01-07 20:52:41 +0000 | [diff] [blame] | 497 | 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 Perches | 22ded57 | 2013-10-28 12:53:21 -0700 | [diff] [blame] | 501 | pr_err("invalid IPv6 address at: <%c>\n", *end); |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 502 | goto out_unlock; |
Cong Wang | b3d936f | 2013-01-07 20:52:41 +0000 | [diff] [blame] | 503 | } |
| 504 | nt->np.ipv6 = true; |
| 505 | } else |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 506 | goto out_unlock; |
Cong Wang | b3d936f | 2013-01-07 20:52:41 +0000 | [diff] [blame] | 507 | } else { |
| 508 | if (!nt->np.ipv6) { |
| 509 | nt->np.local_ip.ip = in_aton(buf); |
| 510 | } else |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 511 | goto out_unlock; |
Cong Wang | b3d936f | 2013-01-07 20:52:41 +0000 | [diff] [blame] | 512 | } |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 513 | |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 514 | mutex_unlock(&dynamic_netconsole_mutex); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 515 | return strnlen(buf, count); |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 516 | out_unlock: |
| 517 | mutex_unlock(&dynamic_netconsole_mutex); |
| 518 | return -EINVAL; |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 519 | } |
| 520 | |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 521 | static ssize_t remote_ip_store(struct config_item *item, const char *buf, |
| 522 | size_t count) |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 523 | { |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 524 | struct netconsole_target *nt = to_target(item); |
| 525 | |
| 526 | mutex_lock(&dynamic_netconsole_mutex); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 527 | if (nt->enabled) { |
Joe Perches | 22ded57 | 2013-10-28 12:53:21 -0700 | [diff] [blame] | 528 | pr_err("target (%s) is enabled, disable to update parameters\n", |
| 529 | config_item_name(&nt->item)); |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 530 | goto out_unlock; |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 531 | } |
| 532 | |
Cong Wang | b3d936f | 2013-01-07 20:52:41 +0000 | [diff] [blame] | 533 | 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 Perches | 22ded57 | 2013-10-28 12:53:21 -0700 | [diff] [blame] | 537 | pr_err("invalid IPv6 address at: <%c>\n", *end); |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 538 | goto out_unlock; |
Cong Wang | b3d936f | 2013-01-07 20:52:41 +0000 | [diff] [blame] | 539 | } |
| 540 | nt->np.ipv6 = true; |
| 541 | } else |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 542 | goto out_unlock; |
Cong Wang | b3d936f | 2013-01-07 20:52:41 +0000 | [diff] [blame] | 543 | } else { |
| 544 | if (!nt->np.ipv6) { |
| 545 | nt->np.remote_ip.ip = in_aton(buf); |
| 546 | } else |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 547 | goto out_unlock; |
Cong Wang | b3d936f | 2013-01-07 20:52:41 +0000 | [diff] [blame] | 548 | } |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 549 | |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 550 | mutex_unlock(&dynamic_netconsole_mutex); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 551 | return strnlen(buf, count); |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 552 | out_unlock: |
| 553 | mutex_unlock(&dynamic_netconsole_mutex); |
| 554 | return -EINVAL; |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 555 | } |
| 556 | |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 557 | static ssize_t remote_mac_store(struct config_item *item, const char *buf, |
| 558 | size_t count) |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 559 | { |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 560 | struct netconsole_target *nt = to_target(item); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 561 | u8 remote_mac[ETH_ALEN]; |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 562 | |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 563 | mutex_lock(&dynamic_netconsole_mutex); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 564 | if (nt->enabled) { |
Joe Perches | 22ded57 | 2013-10-28 12:53:21 -0700 | [diff] [blame] | 565 | pr_err("target (%s) is enabled, disable to update parameters\n", |
| 566 | config_item_name(&nt->item)); |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 567 | goto out_unlock; |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 568 | } |
| 569 | |
Alexey Dobriyan | 4940fc8 | 2011-05-07 23:00:07 +0000 | [diff] [blame] | 570 | if (!mac_pton(buf, remote_mac)) |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 571 | goto out_unlock; |
Alexey Dobriyan | 4940fc8 | 2011-05-07 23:00:07 +0000 | [diff] [blame] | 572 | if (buf[3 * ETH_ALEN - 1] && buf[3 * ETH_ALEN - 1] != '\n') |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 573 | goto out_unlock; |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 574 | memcpy(nt->np.remote_mac, remote_mac, ETH_ALEN); |
| 575 | |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 576 | mutex_unlock(&dynamic_netconsole_mutex); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 577 | return strnlen(buf, count); |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 578 | out_unlock: |
| 579 | mutex_unlock(&dynamic_netconsole_mutex); |
| 580 | return -EINVAL; |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 581 | } |
| 582 | |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 583 | CONFIGFS_ATTR(, enabled); |
| 584 | CONFIGFS_ATTR(, extended); |
| 585 | CONFIGFS_ATTR(, dev_name); |
| 586 | CONFIGFS_ATTR(, local_port); |
| 587 | CONFIGFS_ATTR(, remote_port); |
| 588 | CONFIGFS_ATTR(, local_ip); |
| 589 | CONFIGFS_ATTR(, remote_ip); |
| 590 | CONFIGFS_ATTR_RO(, local_mac); |
| 591 | CONFIGFS_ATTR(, remote_mac); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 592 | |
| 593 | static struct configfs_attribute *netconsole_target_attrs[] = { |
Christoph Hellwig | ea9ed9c | 2015-10-03 15:32:56 +0200 | [diff] [blame] | 594 | &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 Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 603 | NULL, |
| 604 | }; |
| 605 | |
| 606 | /* |
| 607 | * Item operations and type for netconsole_target. |
| 608 | */ |
| 609 | |
| 610 | static void netconsole_target_release(struct config_item *item) |
| 611 | { |
| 612 | kfree(to_target(item)); |
| 613 | } |
| 614 | |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 615 | static struct configfs_item_operations netconsole_target_item_ops = { |
| 616 | .release = netconsole_target_release, |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 617 | }; |
| 618 | |
| 619 | static 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 Becker | f89ab86 | 2008-07-17 14:53:48 -0700 | [diff] [blame] | 629 | static struct config_item *make_netconsole_target(struct config_group *group, |
| 630 | const char *name) |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 631 | { |
| 632 | unsigned long flags; |
| 633 | struct netconsole_target *nt; |
| 634 | |
| 635 | /* |
| 636 | * Allocate and initialize with defaults. |
Tejun Heo | 698cf1c | 2015-06-25 15:01:36 -0700 | [diff] [blame] | 637 | * Target is disabled at creation (!enabled). |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 638 | */ |
| 639 | nt = kzalloc(sizeof(*nt), GFP_KERNEL); |
Joe Perches | e404dec | 2012-01-29 12:56:23 +0000 | [diff] [blame] | 640 | if (!nt) |
Joel Becker | a6795e9 | 2008-07-17 15:21:29 -0700 | [diff] [blame] | 641 | return ERR_PTR(-ENOMEM); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 642 | |
| 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 Perches | 1667c94 | 2015-03-02 19:54:50 -0800 | [diff] [blame] | 647 | eth_broadcast_addr(nt->np.remote_mac); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 648 | |
| 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 Becker | f89ab86 | 2008-07-17 14:53:48 -0700 | [diff] [blame] | 657 | return &nt->item; |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 658 | } |
| 659 | |
| 660 | static 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 | |
| 680 | static struct configfs_group_operations netconsole_subsys_group_ops = { |
| 681 | .make_item = make_netconsole_target, |
| 682 | .drop_item = drop_netconsole_target, |
| 683 | }; |
| 684 | |
| 685 | static 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 */ |
| 691 | static 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 Sharma | 17951f3 | 2007-08-10 15:33:01 -0700 | [diff] [blame] | 702 | /* Handle network interface device notifications */ |
| 703 | static int netconsole_netdev_event(struct notifier_block *this, |
Jiri Pirko | 351638e | 2013-05-28 01:30:21 +0000 | [diff] [blame] | 704 | unsigned long event, void *ptr) |
Satyam Sharma | 17951f3 | 2007-08-10 15:33:01 -0700 | [diff] [blame] | 705 | { |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 706 | unsigned long flags; |
| 707 | struct netconsole_target *nt; |
Jiri Pirko | 351638e | 2013-05-28 01:30:21 +0000 | [diff] [blame] | 708 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
Ferenc Wagner | 141dfba | 2011-01-06 05:11:19 +0000 | [diff] [blame] | 709 | bool stopped = false; |
Satyam Sharma | 17951f3 | 2007-08-10 15:33:01 -0700 | [diff] [blame] | 710 | |
WANG Cong | 0e34e93 | 2010-05-06 00:47:21 -0700 | [diff] [blame] | 711 | if (!(event == NETDEV_CHANGENAME || event == NETDEV_UNREGISTER || |
Amerigo Wang | daf9209 | 2011-05-19 21:39:12 +0000 | [diff] [blame] | 712 | event == NETDEV_RELEASE || event == NETDEV_JOIN)) |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 713 | goto done; |
Satyam Sharma | 17951f3 | 2007-08-10 15:33:01 -0700 | [diff] [blame] | 714 | |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 715 | spin_lock_irqsave(&target_list_lock, flags); |
Veaceslav Falico | 3f315be | 2013-03-11 00:21:48 +0000 | [diff] [blame] | 716 | restart: |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 717 | list_for_each_entry(nt, &target_list, list) { |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 718 | netconsole_target_get(nt); |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 719 | if (nt->np.dev == dev) { |
| 720 | switch (event) { |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 721 | case NETDEV_CHANGENAME: |
| 722 | strlcpy(nt->np.dev_name, dev->name, IFNAMSIZ); |
| 723 | break; |
Amerigo Wang | daf9209 | 2011-05-19 21:39:12 +0000 | [diff] [blame] | 724 | case NETDEV_RELEASE: |
Amerigo Wang | 8d8fc29 | 2011-05-19 21:39:10 +0000 | [diff] [blame] | 725 | case NETDEV_JOIN: |
Bruno Prémont | 2382b15 | 2009-04-29 20:45:17 +0000 | [diff] [blame] | 726 | case NETDEV_UNREGISTER: |
Nikolay Aleksandrov | c71380f | 2013-09-19 15:02:36 +0200 | [diff] [blame] | 727 | /* rtnl_lock already held |
Veaceslav Falico | 3f315be | 2013-03-11 00:21:48 +0000 | [diff] [blame] | 728 | * we might sleep in __netpoll_cleanup() |
Neil Horman | 3b410a3 | 2010-10-13 16:01:52 +0000 | [diff] [blame] | 729 | */ |
Veaceslav Falico | 3f315be | 2013-03-11 00:21:48 +0000 | [diff] [blame] | 730 | spin_unlock_irqrestore(&target_list_lock, flags); |
Dan Aloni | 7a163bf | 2013-08-30 13:59:46 +0300 | [diff] [blame] | 731 | |
Veaceslav Falico | 3f315be | 2013-03-11 00:21:48 +0000 | [diff] [blame] | 732 | __netpoll_cleanup(&nt->np); |
Dan Aloni | 7a163bf | 2013-08-30 13:59:46 +0300 | [diff] [blame] | 733 | |
Veaceslav Falico | 3f315be | 2013-03-11 00:21:48 +0000 | [diff] [blame] | 734 | spin_lock_irqsave(&target_list_lock, flags); |
| 735 | dev_put(nt->np.dev); |
| 736 | nt->np.dev = NULL; |
Tejun Heo | 698cf1c | 2015-06-25 15:01:36 -0700 | [diff] [blame] | 737 | nt->enabled = false; |
Ferenc Wagner | 141dfba | 2011-01-06 05:11:19 +0000 | [diff] [blame] | 738 | stopped = true; |
Veaceslav Falico | 3f315be | 2013-03-11 00:21:48 +0000 | [diff] [blame] | 739 | netconsole_target_put(nt); |
| 740 | goto restart; |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 741 | } |
Satyam Sharma | 17951f3 | 2007-08-10 15:33:01 -0700 | [diff] [blame] | 742 | } |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 743 | netconsole_target_put(nt); |
Satyam Sharma | 17951f3 | 2007-08-10 15:33:01 -0700 | [diff] [blame] | 744 | } |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 745 | spin_unlock_irqrestore(&target_list_lock, flags); |
Amerigo Wang | 8d8fc29 | 2011-05-19 21:39:10 +0000 | [diff] [blame] | 746 | if (stopped) { |
Joe Perches | 22ded57 | 2013-10-28 12:53:21 -0700 | [diff] [blame] | 747 | const char *msg = "had an event"; |
Amerigo Wang | 8d8fc29 | 2011-05-19 21:39:10 +0000 | [diff] [blame] | 748 | switch (event) { |
| 749 | case NETDEV_UNREGISTER: |
Joe Perches | 22ded57 | 2013-10-28 12:53:21 -0700 | [diff] [blame] | 750 | msg = "unregistered"; |
Amerigo Wang | 8d8fc29 | 2011-05-19 21:39:10 +0000 | [diff] [blame] | 751 | break; |
Amerigo Wang | daf9209 | 2011-05-19 21:39:12 +0000 | [diff] [blame] | 752 | case NETDEV_RELEASE: |
Joe Perches | 22ded57 | 2013-10-28 12:53:21 -0700 | [diff] [blame] | 753 | msg = "released slaves"; |
Amerigo Wang | 8d8fc29 | 2011-05-19 21:39:10 +0000 | [diff] [blame] | 754 | break; |
| 755 | case NETDEV_JOIN: |
Joe Perches | 22ded57 | 2013-10-28 12:53:21 -0700 | [diff] [blame] | 756 | msg = "is joining a master device"; |
Amerigo Wang | 8d8fc29 | 2011-05-19 21:39:10 +0000 | [diff] [blame] | 757 | break; |
| 758 | } |
Joe Perches | 22ded57 | 2013-10-28 12:53:21 -0700 | [diff] [blame] | 759 | pr_info("network logging stopped on interface %s as it %s\n", |
| 760 | dev->name, msg); |
Amerigo Wang | 8d8fc29 | 2011-05-19 21:39:10 +0000 | [diff] [blame] | 761 | } |
Satyam Sharma | 17951f3 | 2007-08-10 15:33:01 -0700 | [diff] [blame] | 762 | |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 763 | done: |
Satyam Sharma | 17951f3 | 2007-08-10 15:33:01 -0700 | [diff] [blame] | 764 | return NOTIFY_DONE; |
| 765 | } |
| 766 | |
| 767 | static struct notifier_block netconsole_netdev_notifier = { |
| 768 | .notifier_call = netconsole_netdev_event, |
| 769 | }; |
| 770 | |
Tejun Heo | e2f15f9 | 2015-06-25 15:01:41 -0700 | [diff] [blame] | 771 | /** |
| 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 | */ |
| 781 | static 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 | |
| 831 | static 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | static void write_msg(struct console *con, const char *msg, unsigned int len) |
| 848 | { |
| 849 | int frag, left; |
| 850 | unsigned long flags; |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 851 | struct netconsole_target *nt; |
| 852 | const char *tmp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | |
Amerigo Wang | c1a6085 | 2012-11-08 03:42:38 +0000 | [diff] [blame] | 854 | if (oops_only && !oops_in_progress) |
| 855 | return; |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 856 | /* 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 Heo | e2f15f9 | 2015-06-25 15:01:41 -0700 | [diff] [blame] | 862 | if (!nt->extended && nt->enabled && netif_running(nt->np.dev)) { |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 863 | /* |
| 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 Sharma | 0cc120be | 2007-08-10 15:30:31 -0700 | [diff] [blame] | 876 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 877 | } |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 878 | spin_unlock_irqrestore(&target_list_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 879 | } |
| 880 | |
Tejun Heo | e2f15f9 | 2015-06-25 15:01:41 -0700 | [diff] [blame] | 881 | static 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | static struct console netconsole = { |
Satyam Sharma | d39badf | 2007-08-10 15:27:24 -0700 | [diff] [blame] | 888 | .name = "netcon", |
Michael Ellerman | 0517dee | 2008-04-15 00:49:04 -0700 | [diff] [blame] | 889 | .flags = CON_ENABLED, |
Satyam Sharma | d39badf | 2007-08-10 15:27:24 -0700 | [diff] [blame] | 890 | .write = write_msg, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | }; |
| 892 | |
Satyam Sharma | d39badf | 2007-08-10 15:27:24 -0700 | [diff] [blame] | 893 | static int __init init_netconsole(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 894 | { |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 895 | int err; |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 896 | struct netconsole_target *nt, *tmp; |
| 897 | unsigned long flags; |
| 898 | char *target_config; |
| 899 | char *input = config; |
Stephen Hemminger | b41848b | 2006-10-26 15:46:52 -0700 | [diff] [blame] | 900 | |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 901 | 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 Ellerman | 0517dee | 2008-04-15 00:49:04 -0700 | [diff] [blame] | 908 | /* Dump existing printks when we register */ |
Tejun Heo | e2f15f9 | 2015-06-25 15:01:41 -0700 | [diff] [blame] | 909 | if (nt->extended) |
| 910 | netconsole_ext.flags |= CON_PRINTBUFFER | |
| 911 | CON_ENABLED; |
| 912 | else |
| 913 | netconsole.flags |= CON_PRINTBUFFER; |
Michael Ellerman | 0517dee | 2008-04-15 00:49:04 -0700 | [diff] [blame] | 914 | |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 915 | spin_lock_irqsave(&target_list_lock, flags); |
| 916 | list_add(&nt->list, &target_list); |
| 917 | spin_unlock_irqrestore(&target_list_lock, flags); |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 918 | } |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 919 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 920 | |
Satyam Sharma | 17951f3 | 2007-08-10 15:33:01 -0700 | [diff] [blame] | 921 | err = register_netdevice_notifier(&netconsole_netdev_notifier); |
| 922 | if (err) |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 923 | goto fail; |
Satyam Sharma | 17951f3 | 2007-08-10 15:33:01 -0700 | [diff] [blame] | 924 | |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 925 | err = dynamic_netconsole_init(); |
| 926 | if (err) |
| 927 | goto undonotifier; |
| 928 | |
Tejun Heo | e2f15f9 | 2015-06-25 15:01:41 -0700 | [diff] [blame] | 929 | if (netconsole_ext.flags & CON_ENABLED) |
| 930 | register_console(&netconsole_ext); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 931 | register_console(&netconsole); |
Joe Perches | 22ded57 | 2013-10-28 12:53:21 -0700 | [diff] [blame] | 932 | pr_info("network logging started\n"); |
Satyam Sharma | d39badf | 2007-08-10 15:27:24 -0700 | [diff] [blame] | 933 | |
Satyam Sharma | d39badf | 2007-08-10 15:27:24 -0700 | [diff] [blame] | 934 | return err; |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 935 | |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 936 | undonotifier: |
| 937 | unregister_netdevice_notifier(&netconsole_netdev_notifier); |
| 938 | |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 939 | fail: |
Joe Perches | 22ded57 | 2013-10-28 12:53:21 -0700 | [diff] [blame] | 940 | pr_err("cleaning up\n"); |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 941 | |
| 942 | /* |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 943 | * Remove all targets and destroy them (only targets created |
| 944 | * from the boot/module option exist here). Skipping the list |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 945 | * 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 Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 949 | free_param_target(nt); |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 950 | } |
| 951 | |
| 952 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 953 | } |
| 954 | |
Satyam Sharma | d39badf | 2007-08-10 15:27:24 -0700 | [diff] [blame] | 955 | static void __exit cleanup_netconsole(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 956 | { |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 957 | struct netconsole_target *nt, *tmp; |
Satyam Sharma | df180e3 | 2007-08-10 15:32:14 -0700 | [diff] [blame] | 958 | |
Tejun Heo | e2f15f9 | 2015-06-25 15:01:41 -0700 | [diff] [blame] | 959 | unregister_console(&netconsole_ext); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | unregister_console(&netconsole); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 961 | dynamic_netconsole_exit(); |
Satyam Sharma | 17951f3 | 2007-08-10 15:33:01 -0700 | [diff] [blame] | 962 | unregister_netdevice_notifier(&netconsole_netdev_notifier); |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 963 | |
| 964 | /* |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 965 | * 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 Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 971 | */ |
| 972 | list_for_each_entry_safe(nt, tmp, &target_list, list) { |
| 973 | list_del(&nt->list); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 974 | free_param_target(nt); |
Satyam Sharma | b5427c2 | 2007-08-10 15:33:40 -0700 | [diff] [blame] | 975 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 976 | } |
| 977 | |
Lin Ming | 97c7de0 | 2011-09-20 15:45:07 -0400 | [diff] [blame] | 978 | /* |
| 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 | */ |
| 984 | late_initcall(init_netconsole); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 985 | module_exit(cleanup_netconsole); |