11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * linux/drivers/net/netconsole.c 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Copyright (C) 2001 Ingo Molnar <mingo@redhat.com> 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * This file contains the implementation of an IRQ-safe, crash-safe 71da177e4SLinus Torvalds * kernel console implementation that outputs kernel messages to the 81da177e4SLinus Torvalds * network. 91da177e4SLinus Torvalds * 101da177e4SLinus Torvalds * Modification history: 111da177e4SLinus Torvalds * 121da177e4SLinus Torvalds * 2001-09-17 started by Ingo Molnar. 131da177e4SLinus Torvalds * 2003-08-11 2.6 port by Matt Mackall 141da177e4SLinus Torvalds * simplified options 151da177e4SLinus Torvalds * generic card hooks 161da177e4SLinus Torvalds * works non-modular 171da177e4SLinus Torvalds * 2003-09-07 rewritten with netpoll api 181da177e4SLinus Torvalds */ 191da177e4SLinus Torvalds 201da177e4SLinus Torvalds /**************************************************************** 211da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or modify 221da177e4SLinus Torvalds * it under the terms of the GNU General Public License as published by 231da177e4SLinus Torvalds * the Free Software Foundation; either version 2, or (at your option) 241da177e4SLinus Torvalds * any later version. 251da177e4SLinus Torvalds * 261da177e4SLinus Torvalds * This program is distributed in the hope that it will be useful, 271da177e4SLinus Torvalds * but WITHOUT ANY WARRANTY; without even the implied warranty of 281da177e4SLinus Torvalds * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 291da177e4SLinus Torvalds * GNU General Public License for more details. 301da177e4SLinus Torvalds * 311da177e4SLinus Torvalds * You should have received a copy of the GNU General Public License 321da177e4SLinus Torvalds * along with this program; if not, write to the Free Software 331da177e4SLinus Torvalds * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 341da177e4SLinus Torvalds * 351da177e4SLinus Torvalds ****************************************************************/ 361da177e4SLinus Torvalds 371da177e4SLinus Torvalds #include <linux/mm.h> 381da177e4SLinus Torvalds #include <linux/init.h> 391da177e4SLinus Torvalds #include <linux/module.h> 405a0e3ad6STejun Heo #include <linux/slab.h> 411da177e4SLinus Torvalds #include <linux/console.h> 421da177e4SLinus Torvalds #include <linux/moduleparam.h> 431da177e4SLinus Torvalds #include <linux/string.h> 441da177e4SLinus Torvalds #include <linux/netpoll.h> 450bcc1816SSatyam Sharma #include <linux/inet.h> 460bcc1816SSatyam Sharma #include <linux/configfs.h> 471da177e4SLinus Torvalds 481da177e4SLinus Torvalds MODULE_AUTHOR("Maintainer: Matt Mackall <mpm@selenic.com>"); 491da177e4SLinus Torvalds MODULE_DESCRIPTION("Console driver for network interfaces"); 501da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 511da177e4SLinus Torvalds 52d39badf0SSatyam Sharma #define MAX_PARAM_LENGTH 256 53d39badf0SSatyam Sharma #define MAX_PRINT_CHUNK 1000 54d39badf0SSatyam Sharma 55d39badf0SSatyam Sharma static char config[MAX_PARAM_LENGTH]; 56d39badf0SSatyam Sharma module_param_string(netconsole, config, MAX_PARAM_LENGTH, 0); 5761a2d07dSNiels de Vos MODULE_PARM_DESC(netconsole, " netconsole=[src-port]@[src-ip]/[dev],[tgt-port]@<tgt-ip>/[tgt-macaddr]"); 581da177e4SLinus Torvalds 59d2b60881SSatyam Sharma #ifndef MODULE 60d2b60881SSatyam Sharma static int __init option_setup(char *opt) 61d2b60881SSatyam Sharma { 62d2b60881SSatyam Sharma strlcpy(config, opt, MAX_PARAM_LENGTH); 63d2b60881SSatyam Sharma return 1; 64d2b60881SSatyam Sharma } 65d2b60881SSatyam Sharma __setup("netconsole=", option_setup); 66d2b60881SSatyam Sharma #endif /* MODULE */ 67d2b60881SSatyam Sharma 68b5427c27SSatyam Sharma /* Linked list of all configured targets */ 69b5427c27SSatyam Sharma static LIST_HEAD(target_list); 70b5427c27SSatyam Sharma 71b5427c27SSatyam Sharma /* This needs to be a spinlock because write_msg() cannot sleep */ 72b5427c27SSatyam Sharma static DEFINE_SPINLOCK(target_list_lock); 73b5427c27SSatyam Sharma 74df180e36SSatyam Sharma /** 75df180e36SSatyam Sharma * struct netconsole_target - Represents a configured netconsole target. 76b5427c27SSatyam Sharma * @list: Links this target into the target_list. 770bcc1816SSatyam Sharma * @item: Links us into the configfs subsystem hierarchy. 780bcc1816SSatyam Sharma * @enabled: On / off knob to enable / disable target. 790bcc1816SSatyam Sharma * Visible from userspace (read-write). 800bcc1816SSatyam Sharma * We maintain a strict 1:1 correspondence between this and 810bcc1816SSatyam Sharma * whether the corresponding netpoll is active or inactive. 820bcc1816SSatyam Sharma * Also, other parameters of a target may be modified at 830bcc1816SSatyam Sharma * runtime only when it is disabled (enabled == 0). 84df180e36SSatyam Sharma * @np: The netpoll structure for this target. 850bcc1816SSatyam Sharma * Contains the other userspace visible parameters: 860bcc1816SSatyam Sharma * dev_name (read-write) 870bcc1816SSatyam Sharma * local_port (read-write) 880bcc1816SSatyam Sharma * remote_port (read-write) 890bcc1816SSatyam Sharma * local_ip (read-write) 900bcc1816SSatyam Sharma * remote_ip (read-write) 910bcc1816SSatyam Sharma * local_mac (read-only) 920bcc1816SSatyam Sharma * remote_mac (read-write) 93df180e36SSatyam Sharma */ 94df180e36SSatyam Sharma struct netconsole_target { 95b5427c27SSatyam Sharma struct list_head list; 960bcc1816SSatyam Sharma #ifdef CONFIG_NETCONSOLE_DYNAMIC 970bcc1816SSatyam Sharma struct config_item item; 980bcc1816SSatyam Sharma #endif 990bcc1816SSatyam Sharma int enabled; 100df180e36SSatyam Sharma struct netpoll np; 101df180e36SSatyam Sharma }; 102df180e36SSatyam Sharma 1030bcc1816SSatyam Sharma #ifdef CONFIG_NETCONSOLE_DYNAMIC 1040bcc1816SSatyam Sharma 1050bcc1816SSatyam Sharma static struct configfs_subsystem netconsole_subsys; 1060bcc1816SSatyam Sharma 1070bcc1816SSatyam Sharma static int __init dynamic_netconsole_init(void) 1080bcc1816SSatyam Sharma { 1090bcc1816SSatyam Sharma config_group_init(&netconsole_subsys.su_group); 1100bcc1816SSatyam Sharma mutex_init(&netconsole_subsys.su_mutex); 1110bcc1816SSatyam Sharma return configfs_register_subsystem(&netconsole_subsys); 1120bcc1816SSatyam Sharma } 1130bcc1816SSatyam Sharma 1140bcc1816SSatyam Sharma static void __exit dynamic_netconsole_exit(void) 1150bcc1816SSatyam Sharma { 1160bcc1816SSatyam Sharma configfs_unregister_subsystem(&netconsole_subsys); 1170bcc1816SSatyam Sharma } 1180bcc1816SSatyam Sharma 1190bcc1816SSatyam Sharma /* 1200bcc1816SSatyam Sharma * Targets that were created by parsing the boot/module option string 1210bcc1816SSatyam Sharma * do not exist in the configfs hierarchy (and have NULL names) and will 1220bcc1816SSatyam Sharma * never go away, so make these a no-op for them. 1230bcc1816SSatyam Sharma */ 1240bcc1816SSatyam Sharma static void netconsole_target_get(struct netconsole_target *nt) 1250bcc1816SSatyam Sharma { 1260bcc1816SSatyam Sharma if (config_item_name(&nt->item)) 1270bcc1816SSatyam Sharma config_item_get(&nt->item); 1280bcc1816SSatyam Sharma } 1290bcc1816SSatyam Sharma 1300bcc1816SSatyam Sharma static void netconsole_target_put(struct netconsole_target *nt) 1310bcc1816SSatyam Sharma { 1320bcc1816SSatyam Sharma if (config_item_name(&nt->item)) 1330bcc1816SSatyam Sharma config_item_put(&nt->item); 1340bcc1816SSatyam Sharma } 1350bcc1816SSatyam Sharma 1360bcc1816SSatyam Sharma #else /* !CONFIG_NETCONSOLE_DYNAMIC */ 1370bcc1816SSatyam Sharma 1380bcc1816SSatyam Sharma static int __init dynamic_netconsole_init(void) 1390bcc1816SSatyam Sharma { 1400bcc1816SSatyam Sharma return 0; 1410bcc1816SSatyam Sharma } 1420bcc1816SSatyam Sharma 1430bcc1816SSatyam Sharma static void __exit dynamic_netconsole_exit(void) 1440bcc1816SSatyam Sharma { 1450bcc1816SSatyam Sharma } 1460bcc1816SSatyam Sharma 1470bcc1816SSatyam Sharma /* 1480bcc1816SSatyam Sharma * No danger of targets going away from under us when dynamic 1490bcc1816SSatyam Sharma * reconfigurability is off. 1500bcc1816SSatyam Sharma */ 1510bcc1816SSatyam Sharma static void netconsole_target_get(struct netconsole_target *nt) 1520bcc1816SSatyam Sharma { 1530bcc1816SSatyam Sharma } 1540bcc1816SSatyam Sharma 1550bcc1816SSatyam Sharma static void netconsole_target_put(struct netconsole_target *nt) 1560bcc1816SSatyam Sharma { 1570bcc1816SSatyam Sharma } 1580bcc1816SSatyam Sharma 1590bcc1816SSatyam Sharma #endif /* CONFIG_NETCONSOLE_DYNAMIC */ 1600bcc1816SSatyam Sharma 1610bcc1816SSatyam Sharma /* Allocate new target (from boot/module param) and setup netpoll for it */ 1620bcc1816SSatyam Sharma static struct netconsole_target *alloc_param_target(char *target_config) 163b5427c27SSatyam Sharma { 164b5427c27SSatyam Sharma int err = -ENOMEM; 165b5427c27SSatyam Sharma struct netconsole_target *nt; 166b5427c27SSatyam Sharma 1670bcc1816SSatyam Sharma /* 1680bcc1816SSatyam Sharma * Allocate and initialize with defaults. 1690bcc1816SSatyam Sharma * Note that these targets get their config_item fields zeroed-out. 1700bcc1816SSatyam Sharma */ 171b5427c27SSatyam Sharma nt = kzalloc(sizeof(*nt), GFP_KERNEL); 172b5427c27SSatyam Sharma if (!nt) { 173b5427c27SSatyam Sharma printk(KERN_ERR "netconsole: failed to allocate memory\n"); 174b5427c27SSatyam Sharma goto fail; 175b5427c27SSatyam Sharma } 176b5427c27SSatyam Sharma 177b5427c27SSatyam Sharma nt->np.name = "netconsole"; 178b5427c27SSatyam Sharma strlcpy(nt->np.dev_name, "eth0", IFNAMSIZ); 179b5427c27SSatyam Sharma nt->np.local_port = 6665; 180b5427c27SSatyam Sharma nt->np.remote_port = 6666; 181b5427c27SSatyam Sharma memset(nt->np.remote_mac, 0xff, ETH_ALEN); 182b5427c27SSatyam Sharma 183b5427c27SSatyam Sharma /* Parse parameters and setup netpoll */ 184b5427c27SSatyam Sharma err = netpoll_parse_options(&nt->np, target_config); 185b5427c27SSatyam Sharma if (err) 186b5427c27SSatyam Sharma goto fail; 187b5427c27SSatyam Sharma 188b5427c27SSatyam Sharma err = netpoll_setup(&nt->np); 189b5427c27SSatyam Sharma if (err) 190b5427c27SSatyam Sharma goto fail; 191b5427c27SSatyam Sharma 1920bcc1816SSatyam Sharma nt->enabled = 1; 1930bcc1816SSatyam Sharma 194b5427c27SSatyam Sharma return nt; 195b5427c27SSatyam Sharma 196b5427c27SSatyam Sharma fail: 197b5427c27SSatyam Sharma kfree(nt); 198b5427c27SSatyam Sharma return ERR_PTR(err); 199b5427c27SSatyam Sharma } 200b5427c27SSatyam Sharma 2010bcc1816SSatyam Sharma /* Cleanup netpoll for given target (from boot/module param) and free it */ 2020bcc1816SSatyam Sharma static void free_param_target(struct netconsole_target *nt) 203b5427c27SSatyam Sharma { 204b5427c27SSatyam Sharma netpoll_cleanup(&nt->np); 205b5427c27SSatyam Sharma kfree(nt); 206b5427c27SSatyam Sharma } 2071da177e4SLinus Torvalds 2080bcc1816SSatyam Sharma #ifdef CONFIG_NETCONSOLE_DYNAMIC 2090bcc1816SSatyam Sharma 2100bcc1816SSatyam Sharma /* 2110bcc1816SSatyam Sharma * Our subsystem hierarchy is: 2120bcc1816SSatyam Sharma * 2130bcc1816SSatyam Sharma * /sys/kernel/config/netconsole/ 2140bcc1816SSatyam Sharma * | 2150bcc1816SSatyam Sharma * <target>/ 2160bcc1816SSatyam Sharma * | enabled 2170bcc1816SSatyam Sharma * | dev_name 2180bcc1816SSatyam Sharma * | local_port 2190bcc1816SSatyam Sharma * | remote_port 2200bcc1816SSatyam Sharma * | local_ip 2210bcc1816SSatyam Sharma * | remote_ip 2220bcc1816SSatyam Sharma * | local_mac 2230bcc1816SSatyam Sharma * | remote_mac 2240bcc1816SSatyam Sharma * | 2250bcc1816SSatyam Sharma * <target>/... 2260bcc1816SSatyam Sharma */ 2270bcc1816SSatyam Sharma 2280bcc1816SSatyam Sharma struct netconsole_target_attr { 2290bcc1816SSatyam Sharma struct configfs_attribute attr; 2300bcc1816SSatyam Sharma ssize_t (*show)(struct netconsole_target *nt, 2310bcc1816SSatyam Sharma char *buf); 2320bcc1816SSatyam Sharma ssize_t (*store)(struct netconsole_target *nt, 2330bcc1816SSatyam Sharma const char *buf, 2340bcc1816SSatyam Sharma size_t count); 2350bcc1816SSatyam Sharma }; 2360bcc1816SSatyam Sharma 2370bcc1816SSatyam Sharma static struct netconsole_target *to_target(struct config_item *item) 2380bcc1816SSatyam Sharma { 2390bcc1816SSatyam Sharma return item ? 2400bcc1816SSatyam Sharma container_of(item, struct netconsole_target, item) : 2410bcc1816SSatyam Sharma NULL; 2420bcc1816SSatyam Sharma } 2430bcc1816SSatyam Sharma 2440bcc1816SSatyam Sharma /* 2450bcc1816SSatyam Sharma * Attribute operations for netconsole_target. 2460bcc1816SSatyam Sharma */ 2470bcc1816SSatyam Sharma 2480bcc1816SSatyam Sharma static ssize_t show_enabled(struct netconsole_target *nt, char *buf) 2490bcc1816SSatyam Sharma { 2500bcc1816SSatyam Sharma return snprintf(buf, PAGE_SIZE, "%d\n", nt->enabled); 2510bcc1816SSatyam Sharma } 2520bcc1816SSatyam Sharma 2530bcc1816SSatyam Sharma static ssize_t show_dev_name(struct netconsole_target *nt, char *buf) 2540bcc1816SSatyam Sharma { 2550bcc1816SSatyam Sharma return snprintf(buf, PAGE_SIZE, "%s\n", nt->np.dev_name); 2560bcc1816SSatyam Sharma } 2570bcc1816SSatyam Sharma 2580bcc1816SSatyam Sharma static ssize_t show_local_port(struct netconsole_target *nt, char *buf) 2590bcc1816SSatyam Sharma { 2600bcc1816SSatyam Sharma return snprintf(buf, PAGE_SIZE, "%d\n", nt->np.local_port); 2610bcc1816SSatyam Sharma } 2620bcc1816SSatyam Sharma 2630bcc1816SSatyam Sharma static ssize_t show_remote_port(struct netconsole_target *nt, char *buf) 2640bcc1816SSatyam Sharma { 2650bcc1816SSatyam Sharma return snprintf(buf, PAGE_SIZE, "%d\n", nt->np.remote_port); 2660bcc1816SSatyam Sharma } 2670bcc1816SSatyam Sharma 2680bcc1816SSatyam Sharma static ssize_t show_local_ip(struct netconsole_target *nt, char *buf) 2690bcc1816SSatyam Sharma { 270e7557af5SHarvey Harrison return snprintf(buf, PAGE_SIZE, "%pI4\n", &nt->np.local_ip); 2710bcc1816SSatyam Sharma } 2720bcc1816SSatyam Sharma 2730bcc1816SSatyam Sharma static ssize_t show_remote_ip(struct netconsole_target *nt, char *buf) 2740bcc1816SSatyam Sharma { 275e7557af5SHarvey Harrison return snprintf(buf, PAGE_SIZE, "%pI4\n", &nt->np.remote_ip); 2760bcc1816SSatyam Sharma } 2770bcc1816SSatyam Sharma 2780bcc1816SSatyam Sharma static ssize_t show_local_mac(struct netconsole_target *nt, char *buf) 2790bcc1816SSatyam Sharma { 28009538641SStephen Hemminger struct net_device *dev = nt->np.dev; 281e174961cSJohannes Berg static const u8 bcast[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 28209538641SStephen Hemminger 283e174961cSJohannes Berg return snprintf(buf, PAGE_SIZE, "%pM\n", dev ? dev->dev_addr : bcast); 2840bcc1816SSatyam Sharma } 2850bcc1816SSatyam Sharma 2860bcc1816SSatyam Sharma static ssize_t show_remote_mac(struct netconsole_target *nt, char *buf) 2870bcc1816SSatyam Sharma { 288e174961cSJohannes Berg return snprintf(buf, PAGE_SIZE, "%pM\n", nt->np.remote_mac); 2890bcc1816SSatyam Sharma } 2900bcc1816SSatyam Sharma 2910bcc1816SSatyam Sharma /* 2920bcc1816SSatyam Sharma * This one is special -- targets created through the configfs interface 2930bcc1816SSatyam Sharma * are not enabled (and the corresponding netpoll activated) by default. 2940bcc1816SSatyam Sharma * The user is expected to set the desired parameters first (which 2950bcc1816SSatyam Sharma * would enable him to dynamically add new netpoll targets for new 2960bcc1816SSatyam Sharma * network interfaces as and when they come up). 2970bcc1816SSatyam Sharma */ 2980bcc1816SSatyam Sharma static ssize_t store_enabled(struct netconsole_target *nt, 2990bcc1816SSatyam Sharma const char *buf, 3000bcc1816SSatyam Sharma size_t count) 3010bcc1816SSatyam Sharma { 30299f823f9SAlexey Dobriyan int enabled; 3030bcc1816SSatyam Sharma int err; 3040bcc1816SSatyam Sharma 30599f823f9SAlexey Dobriyan err = kstrtoint(buf, 10, &enabled); 30699f823f9SAlexey Dobriyan if (err < 0) 30799f823f9SAlexey Dobriyan return err; 30899f823f9SAlexey Dobriyan if (enabled < 0 || enabled > 1) 30999f823f9SAlexey Dobriyan return -EINVAL; 3100bcc1816SSatyam Sharma 3110bcc1816SSatyam Sharma if (enabled) { /* 1 */ 3120bcc1816SSatyam Sharma 3130bcc1816SSatyam Sharma /* 3140bcc1816SSatyam Sharma * Skip netpoll_parse_options() -- all the attributes are 3150bcc1816SSatyam Sharma * already configured via configfs. Just print them out. 3160bcc1816SSatyam Sharma */ 3170bcc1816SSatyam Sharma netpoll_print_options(&nt->np); 3180bcc1816SSatyam Sharma 3190bcc1816SSatyam Sharma err = netpoll_setup(&nt->np); 3200bcc1816SSatyam Sharma if (err) 3210bcc1816SSatyam Sharma return err; 3220bcc1816SSatyam Sharma 3230bcc1816SSatyam Sharma printk(KERN_INFO "netconsole: network logging started\n"); 3240bcc1816SSatyam Sharma 3250bcc1816SSatyam Sharma } else { /* 0 */ 3260bcc1816SSatyam Sharma netpoll_cleanup(&nt->np); 3270bcc1816SSatyam Sharma } 3280bcc1816SSatyam Sharma 3290bcc1816SSatyam Sharma nt->enabled = enabled; 3300bcc1816SSatyam Sharma 3310bcc1816SSatyam Sharma return strnlen(buf, count); 3320bcc1816SSatyam Sharma } 3330bcc1816SSatyam Sharma 3340bcc1816SSatyam Sharma static ssize_t store_dev_name(struct netconsole_target *nt, 3350bcc1816SSatyam Sharma const char *buf, 3360bcc1816SSatyam Sharma size_t count) 3370bcc1816SSatyam Sharma { 3380bcc1816SSatyam Sharma size_t len; 3390bcc1816SSatyam Sharma 3400bcc1816SSatyam Sharma if (nt->enabled) { 3410bcc1816SSatyam Sharma printk(KERN_ERR "netconsole: target (%s) is enabled, " 3420bcc1816SSatyam Sharma "disable to update parameters\n", 3430bcc1816SSatyam Sharma config_item_name(&nt->item)); 3440bcc1816SSatyam Sharma return -EINVAL; 3450bcc1816SSatyam Sharma } 3460bcc1816SSatyam Sharma 3470bcc1816SSatyam Sharma strlcpy(nt->np.dev_name, buf, IFNAMSIZ); 3480bcc1816SSatyam Sharma 3490bcc1816SSatyam Sharma /* Get rid of possible trailing newline from echo(1) */ 3500bcc1816SSatyam Sharma len = strnlen(nt->np.dev_name, IFNAMSIZ); 3510bcc1816SSatyam Sharma if (nt->np.dev_name[len - 1] == '\n') 3520bcc1816SSatyam Sharma nt->np.dev_name[len - 1] = '\0'; 3530bcc1816SSatyam Sharma 3540bcc1816SSatyam Sharma return strnlen(buf, count); 3550bcc1816SSatyam Sharma } 3560bcc1816SSatyam Sharma 3570bcc1816SSatyam Sharma static ssize_t store_local_port(struct netconsole_target *nt, 3580bcc1816SSatyam Sharma const char *buf, 3590bcc1816SSatyam Sharma size_t count) 3600bcc1816SSatyam Sharma { 36199f823f9SAlexey Dobriyan int rv; 3620bcc1816SSatyam Sharma 3630bcc1816SSatyam Sharma if (nt->enabled) { 3640bcc1816SSatyam Sharma printk(KERN_ERR "netconsole: target (%s) is enabled, " 3650bcc1816SSatyam Sharma "disable to update parameters\n", 3660bcc1816SSatyam Sharma config_item_name(&nt->item)); 3670bcc1816SSatyam Sharma return -EINVAL; 3680bcc1816SSatyam Sharma } 3690bcc1816SSatyam Sharma 37099f823f9SAlexey Dobriyan rv = kstrtou16(buf, 10, &nt->np.local_port); 37199f823f9SAlexey Dobriyan if (rv < 0) 37299f823f9SAlexey Dobriyan return rv; 3730bcc1816SSatyam Sharma return strnlen(buf, count); 3740bcc1816SSatyam Sharma } 3750bcc1816SSatyam Sharma 3760bcc1816SSatyam Sharma static ssize_t store_remote_port(struct netconsole_target *nt, 3770bcc1816SSatyam Sharma const char *buf, 3780bcc1816SSatyam Sharma size_t count) 3790bcc1816SSatyam Sharma { 38099f823f9SAlexey Dobriyan int rv; 3810bcc1816SSatyam Sharma 3820bcc1816SSatyam Sharma if (nt->enabled) { 3830bcc1816SSatyam Sharma printk(KERN_ERR "netconsole: target (%s) is enabled, " 3840bcc1816SSatyam Sharma "disable to update parameters\n", 3850bcc1816SSatyam Sharma config_item_name(&nt->item)); 3860bcc1816SSatyam Sharma return -EINVAL; 3870bcc1816SSatyam Sharma } 3880bcc1816SSatyam Sharma 38999f823f9SAlexey Dobriyan rv = kstrtou16(buf, 10, &nt->np.remote_port); 39099f823f9SAlexey Dobriyan if (rv < 0) 39199f823f9SAlexey Dobriyan return rv; 3920bcc1816SSatyam Sharma return strnlen(buf, count); 3930bcc1816SSatyam Sharma } 3940bcc1816SSatyam Sharma 3950bcc1816SSatyam Sharma static ssize_t store_local_ip(struct netconsole_target *nt, 3960bcc1816SSatyam Sharma const char *buf, 3970bcc1816SSatyam Sharma size_t count) 3980bcc1816SSatyam Sharma { 3990bcc1816SSatyam Sharma if (nt->enabled) { 4000bcc1816SSatyam Sharma printk(KERN_ERR "netconsole: target (%s) is enabled, " 4010bcc1816SSatyam Sharma "disable to update parameters\n", 4020bcc1816SSatyam Sharma config_item_name(&nt->item)); 4030bcc1816SSatyam Sharma return -EINVAL; 4040bcc1816SSatyam Sharma } 4050bcc1816SSatyam Sharma 406e7557af5SHarvey Harrison nt->np.local_ip = in_aton(buf); 4070bcc1816SSatyam Sharma 4080bcc1816SSatyam Sharma return strnlen(buf, count); 4090bcc1816SSatyam Sharma } 4100bcc1816SSatyam Sharma 4110bcc1816SSatyam Sharma static ssize_t store_remote_ip(struct netconsole_target *nt, 4120bcc1816SSatyam Sharma const char *buf, 4130bcc1816SSatyam Sharma size_t count) 4140bcc1816SSatyam Sharma { 4150bcc1816SSatyam Sharma if (nt->enabled) { 4160bcc1816SSatyam Sharma printk(KERN_ERR "netconsole: target (%s) is enabled, " 4170bcc1816SSatyam Sharma "disable to update parameters\n", 4180bcc1816SSatyam Sharma config_item_name(&nt->item)); 4190bcc1816SSatyam Sharma return -EINVAL; 4200bcc1816SSatyam Sharma } 4210bcc1816SSatyam Sharma 422e7557af5SHarvey Harrison nt->np.remote_ip = in_aton(buf); 4230bcc1816SSatyam Sharma 4240bcc1816SSatyam Sharma return strnlen(buf, count); 4250bcc1816SSatyam Sharma } 4260bcc1816SSatyam Sharma 4270bcc1816SSatyam Sharma static ssize_t store_remote_mac(struct netconsole_target *nt, 4280bcc1816SSatyam Sharma const char *buf, 4290bcc1816SSatyam Sharma size_t count) 4300bcc1816SSatyam Sharma { 4310bcc1816SSatyam Sharma u8 remote_mac[ETH_ALEN]; 4320bcc1816SSatyam Sharma char *p = (char *) buf; 4330bcc1816SSatyam Sharma int i; 4340bcc1816SSatyam Sharma 4350bcc1816SSatyam Sharma if (nt->enabled) { 4360bcc1816SSatyam Sharma printk(KERN_ERR "netconsole: target (%s) is enabled, " 4370bcc1816SSatyam Sharma "disable to update parameters\n", 4380bcc1816SSatyam Sharma config_item_name(&nt->item)); 4390bcc1816SSatyam Sharma return -EINVAL; 4400bcc1816SSatyam Sharma } 4410bcc1816SSatyam Sharma 4420bcc1816SSatyam Sharma for (i = 0; i < ETH_ALEN - 1; i++) { 4430bcc1816SSatyam Sharma remote_mac[i] = simple_strtoul(p, &p, 16); 4440bcc1816SSatyam Sharma if (*p != ':') 4450bcc1816SSatyam Sharma goto invalid; 4460bcc1816SSatyam Sharma p++; 4470bcc1816SSatyam Sharma } 4480bcc1816SSatyam Sharma remote_mac[ETH_ALEN - 1] = simple_strtoul(p, &p, 16); 4490bcc1816SSatyam Sharma if (*p && (*p != '\n')) 4500bcc1816SSatyam Sharma goto invalid; 4510bcc1816SSatyam Sharma 4520bcc1816SSatyam Sharma memcpy(nt->np.remote_mac, remote_mac, ETH_ALEN); 4530bcc1816SSatyam Sharma 4540bcc1816SSatyam Sharma return strnlen(buf, count); 4550bcc1816SSatyam Sharma 4560bcc1816SSatyam Sharma invalid: 4570bcc1816SSatyam Sharma printk(KERN_ERR "netconsole: invalid input\n"); 4580bcc1816SSatyam Sharma return -EINVAL; 4590bcc1816SSatyam Sharma } 4600bcc1816SSatyam Sharma 4610bcc1816SSatyam Sharma /* 4620bcc1816SSatyam Sharma * Attribute definitions for netconsole_target. 4630bcc1816SSatyam Sharma */ 4640bcc1816SSatyam Sharma 4650bcc1816SSatyam Sharma #define NETCONSOLE_TARGET_ATTR_RO(_name) \ 4660bcc1816SSatyam Sharma static struct netconsole_target_attr netconsole_target_##_name = \ 4670bcc1816SSatyam Sharma __CONFIGFS_ATTR(_name, S_IRUGO, show_##_name, NULL) 4680bcc1816SSatyam Sharma 4690bcc1816SSatyam Sharma #define NETCONSOLE_TARGET_ATTR_RW(_name) \ 4700bcc1816SSatyam Sharma static struct netconsole_target_attr netconsole_target_##_name = \ 4710bcc1816SSatyam Sharma __CONFIGFS_ATTR(_name, S_IRUGO | S_IWUSR, show_##_name, store_##_name) 4720bcc1816SSatyam Sharma 4730bcc1816SSatyam Sharma NETCONSOLE_TARGET_ATTR_RW(enabled); 4740bcc1816SSatyam Sharma NETCONSOLE_TARGET_ATTR_RW(dev_name); 4750bcc1816SSatyam Sharma NETCONSOLE_TARGET_ATTR_RW(local_port); 4760bcc1816SSatyam Sharma NETCONSOLE_TARGET_ATTR_RW(remote_port); 4770bcc1816SSatyam Sharma NETCONSOLE_TARGET_ATTR_RW(local_ip); 4780bcc1816SSatyam Sharma NETCONSOLE_TARGET_ATTR_RW(remote_ip); 4790bcc1816SSatyam Sharma NETCONSOLE_TARGET_ATTR_RO(local_mac); 4800bcc1816SSatyam Sharma NETCONSOLE_TARGET_ATTR_RW(remote_mac); 4810bcc1816SSatyam Sharma 4820bcc1816SSatyam Sharma static struct configfs_attribute *netconsole_target_attrs[] = { 4830bcc1816SSatyam Sharma &netconsole_target_enabled.attr, 4840bcc1816SSatyam Sharma &netconsole_target_dev_name.attr, 4850bcc1816SSatyam Sharma &netconsole_target_local_port.attr, 4860bcc1816SSatyam Sharma &netconsole_target_remote_port.attr, 4870bcc1816SSatyam Sharma &netconsole_target_local_ip.attr, 4880bcc1816SSatyam Sharma &netconsole_target_remote_ip.attr, 4890bcc1816SSatyam Sharma &netconsole_target_local_mac.attr, 4900bcc1816SSatyam Sharma &netconsole_target_remote_mac.attr, 4910bcc1816SSatyam Sharma NULL, 4920bcc1816SSatyam Sharma }; 4930bcc1816SSatyam Sharma 4940bcc1816SSatyam Sharma /* 4950bcc1816SSatyam Sharma * Item operations and type for netconsole_target. 4960bcc1816SSatyam Sharma */ 4970bcc1816SSatyam Sharma 4980bcc1816SSatyam Sharma static void netconsole_target_release(struct config_item *item) 4990bcc1816SSatyam Sharma { 5000bcc1816SSatyam Sharma kfree(to_target(item)); 5010bcc1816SSatyam Sharma } 5020bcc1816SSatyam Sharma 5030bcc1816SSatyam Sharma static ssize_t netconsole_target_attr_show(struct config_item *item, 5040bcc1816SSatyam Sharma struct configfs_attribute *attr, 5050bcc1816SSatyam Sharma char *buf) 5060bcc1816SSatyam Sharma { 5070bcc1816SSatyam Sharma ssize_t ret = -EINVAL; 5080bcc1816SSatyam Sharma struct netconsole_target *nt = to_target(item); 5090bcc1816SSatyam Sharma struct netconsole_target_attr *na = 5100bcc1816SSatyam Sharma container_of(attr, struct netconsole_target_attr, attr); 5110bcc1816SSatyam Sharma 5120bcc1816SSatyam Sharma if (na->show) 5130bcc1816SSatyam Sharma ret = na->show(nt, buf); 5140bcc1816SSatyam Sharma 5150bcc1816SSatyam Sharma return ret; 5160bcc1816SSatyam Sharma } 5170bcc1816SSatyam Sharma 5180bcc1816SSatyam Sharma static ssize_t netconsole_target_attr_store(struct config_item *item, 5190bcc1816SSatyam Sharma struct configfs_attribute *attr, 5200bcc1816SSatyam Sharma const char *buf, 5210bcc1816SSatyam Sharma size_t count) 5220bcc1816SSatyam Sharma { 5230bcc1816SSatyam Sharma ssize_t ret = -EINVAL; 5240bcc1816SSatyam Sharma struct netconsole_target *nt = to_target(item); 5250bcc1816SSatyam Sharma struct netconsole_target_attr *na = 5260bcc1816SSatyam Sharma container_of(attr, struct netconsole_target_attr, attr); 5270bcc1816SSatyam Sharma 5280bcc1816SSatyam Sharma if (na->store) 5290bcc1816SSatyam Sharma ret = na->store(nt, buf, count); 5300bcc1816SSatyam Sharma 5310bcc1816SSatyam Sharma return ret; 5320bcc1816SSatyam Sharma } 5330bcc1816SSatyam Sharma 5340bcc1816SSatyam Sharma static struct configfs_item_operations netconsole_target_item_ops = { 5350bcc1816SSatyam Sharma .release = netconsole_target_release, 5360bcc1816SSatyam Sharma .show_attribute = netconsole_target_attr_show, 5370bcc1816SSatyam Sharma .store_attribute = netconsole_target_attr_store, 5380bcc1816SSatyam Sharma }; 5390bcc1816SSatyam Sharma 5400bcc1816SSatyam Sharma static struct config_item_type netconsole_target_type = { 5410bcc1816SSatyam Sharma .ct_attrs = netconsole_target_attrs, 5420bcc1816SSatyam Sharma .ct_item_ops = &netconsole_target_item_ops, 5430bcc1816SSatyam Sharma .ct_owner = THIS_MODULE, 5440bcc1816SSatyam Sharma }; 5450bcc1816SSatyam Sharma 5460bcc1816SSatyam Sharma /* 5470bcc1816SSatyam Sharma * Group operations and type for netconsole_subsys. 5480bcc1816SSatyam Sharma */ 5490bcc1816SSatyam Sharma 550f89ab861SJoel Becker static struct config_item *make_netconsole_target(struct config_group *group, 551f89ab861SJoel Becker const char *name) 5520bcc1816SSatyam Sharma { 5530bcc1816SSatyam Sharma unsigned long flags; 5540bcc1816SSatyam Sharma struct netconsole_target *nt; 5550bcc1816SSatyam Sharma 5560bcc1816SSatyam Sharma /* 5570bcc1816SSatyam Sharma * Allocate and initialize with defaults. 5580bcc1816SSatyam Sharma * Target is disabled at creation (enabled == 0). 5590bcc1816SSatyam Sharma */ 5600bcc1816SSatyam Sharma nt = kzalloc(sizeof(*nt), GFP_KERNEL); 5610bcc1816SSatyam Sharma if (!nt) { 5620bcc1816SSatyam Sharma printk(KERN_ERR "netconsole: failed to allocate memory\n"); 563a6795e9eSJoel Becker return ERR_PTR(-ENOMEM); 5640bcc1816SSatyam Sharma } 5650bcc1816SSatyam Sharma 5660bcc1816SSatyam Sharma nt->np.name = "netconsole"; 5670bcc1816SSatyam Sharma strlcpy(nt->np.dev_name, "eth0", IFNAMSIZ); 5680bcc1816SSatyam Sharma nt->np.local_port = 6665; 5690bcc1816SSatyam Sharma nt->np.remote_port = 6666; 5700bcc1816SSatyam Sharma memset(nt->np.remote_mac, 0xff, ETH_ALEN); 5710bcc1816SSatyam Sharma 5720bcc1816SSatyam Sharma /* Initialize the config_item member */ 5730bcc1816SSatyam Sharma config_item_init_type_name(&nt->item, name, &netconsole_target_type); 5740bcc1816SSatyam Sharma 5750bcc1816SSatyam Sharma /* Adding, but it is disabled */ 5760bcc1816SSatyam Sharma spin_lock_irqsave(&target_list_lock, flags); 5770bcc1816SSatyam Sharma list_add(&nt->list, &target_list); 5780bcc1816SSatyam Sharma spin_unlock_irqrestore(&target_list_lock, flags); 5790bcc1816SSatyam Sharma 580f89ab861SJoel Becker return &nt->item; 5810bcc1816SSatyam Sharma } 5820bcc1816SSatyam Sharma 5830bcc1816SSatyam Sharma static void drop_netconsole_target(struct config_group *group, 5840bcc1816SSatyam Sharma struct config_item *item) 5850bcc1816SSatyam Sharma { 5860bcc1816SSatyam Sharma unsigned long flags; 5870bcc1816SSatyam Sharma struct netconsole_target *nt = to_target(item); 5880bcc1816SSatyam Sharma 5890bcc1816SSatyam Sharma spin_lock_irqsave(&target_list_lock, flags); 5900bcc1816SSatyam Sharma list_del(&nt->list); 5910bcc1816SSatyam Sharma spin_unlock_irqrestore(&target_list_lock, flags); 5920bcc1816SSatyam Sharma 5930bcc1816SSatyam Sharma /* 5940bcc1816SSatyam Sharma * The target may have never been enabled, or was manually disabled 5950bcc1816SSatyam Sharma * before being removed so netpoll may have already been cleaned up. 5960bcc1816SSatyam Sharma */ 5970bcc1816SSatyam Sharma if (nt->enabled) 5980bcc1816SSatyam Sharma netpoll_cleanup(&nt->np); 5990bcc1816SSatyam Sharma 6000bcc1816SSatyam Sharma config_item_put(&nt->item); 6010bcc1816SSatyam Sharma } 6020bcc1816SSatyam Sharma 6030bcc1816SSatyam Sharma static struct configfs_group_operations netconsole_subsys_group_ops = { 6040bcc1816SSatyam Sharma .make_item = make_netconsole_target, 6050bcc1816SSatyam Sharma .drop_item = drop_netconsole_target, 6060bcc1816SSatyam Sharma }; 6070bcc1816SSatyam Sharma 6080bcc1816SSatyam Sharma static struct config_item_type netconsole_subsys_type = { 6090bcc1816SSatyam Sharma .ct_group_ops = &netconsole_subsys_group_ops, 6100bcc1816SSatyam Sharma .ct_owner = THIS_MODULE, 6110bcc1816SSatyam Sharma }; 6120bcc1816SSatyam Sharma 6130bcc1816SSatyam Sharma /* The netconsole configfs subsystem */ 6140bcc1816SSatyam Sharma static struct configfs_subsystem netconsole_subsys = { 6150bcc1816SSatyam Sharma .su_group = { 6160bcc1816SSatyam Sharma .cg_item = { 6170bcc1816SSatyam Sharma .ci_namebuf = "netconsole", 6180bcc1816SSatyam Sharma .ci_type = &netconsole_subsys_type, 6190bcc1816SSatyam Sharma }, 6200bcc1816SSatyam Sharma }, 6210bcc1816SSatyam Sharma }; 6220bcc1816SSatyam Sharma 6230bcc1816SSatyam Sharma #endif /* CONFIG_NETCONSOLE_DYNAMIC */ 6240bcc1816SSatyam Sharma 62517951f34SSatyam Sharma /* Handle network interface device notifications */ 62617951f34SSatyam Sharma static int netconsole_netdev_event(struct notifier_block *this, 62717951f34SSatyam Sharma unsigned long event, 62817951f34SSatyam Sharma void *ptr) 62917951f34SSatyam Sharma { 630b5427c27SSatyam Sharma unsigned long flags; 631b5427c27SSatyam Sharma struct netconsole_target *nt; 63217951f34SSatyam Sharma struct net_device *dev = ptr; 633141dfba3SFerenc Wagner bool stopped = false; 63417951f34SSatyam Sharma 6350e34e931SWANG Cong if (!(event == NETDEV_CHANGENAME || event == NETDEV_UNREGISTER || 6360e34e931SWANG Cong event == NETDEV_BONDING_DESLAVE || event == NETDEV_GOING_DOWN)) 637b5427c27SSatyam Sharma goto done; 638b5427c27SSatyam Sharma 639b5427c27SSatyam Sharma spin_lock_irqsave(&target_list_lock, flags); 64013f172ffSNeil Horman restart: 641b5427c27SSatyam Sharma list_for_each_entry(nt, &target_list, list) { 6420bcc1816SSatyam Sharma netconsole_target_get(nt); 64317951f34SSatyam Sharma if (nt->np.dev == dev) { 64417951f34SSatyam Sharma switch (event) { 64517951f34SSatyam Sharma case NETDEV_CHANGENAME: 64617951f34SSatyam Sharma strlcpy(nt->np.dev_name, dev->name, IFNAMSIZ); 64717951f34SSatyam Sharma break; 6482382b15bSBruno Prémont case NETDEV_UNREGISTER: 6493b410a31SNeil Horman /* 6503b410a31SNeil Horman * rtnl_lock already held 6513b410a31SNeil Horman */ 6523b410a31SNeil Horman if (nt->np.dev) { 65313f172ffSNeil Horman spin_unlock_irqrestore( 65413f172ffSNeil Horman &target_list_lock, 65513f172ffSNeil Horman flags); 6563b410a31SNeil Horman __netpoll_cleanup(&nt->np); 65713f172ffSNeil Horman spin_lock_irqsave(&target_list_lock, 65813f172ffSNeil Horman flags); 6593b410a31SNeil Horman dev_put(nt->np.dev); 6603b410a31SNeil Horman nt->np.dev = NULL; 66113f172ffSNeil Horman netconsole_target_put(nt); 66213f172ffSNeil Horman goto restart; 6633b410a31SNeil Horman } 6640e34e931SWANG Cong /* Fall through */ 6650e34e931SWANG Cong case NETDEV_GOING_DOWN: 6660e34e931SWANG Cong case NETDEV_BONDING_DESLAVE: 6672382b15bSBruno Prémont nt->enabled = 0; 668141dfba3SFerenc Wagner stopped = true; 6692382b15bSBruno Prémont break; 67017951f34SSatyam Sharma } 67117951f34SSatyam Sharma } 6720bcc1816SSatyam Sharma netconsole_target_put(nt); 673b5427c27SSatyam Sharma } 674b5427c27SSatyam Sharma spin_unlock_irqrestore(&target_list_lock, flags); 675141dfba3SFerenc Wagner if (stopped && (event == NETDEV_UNREGISTER || event == NETDEV_BONDING_DESLAVE)) 67638cfb907SFerenc Wagner printk(KERN_INFO "netconsole: network logging stopped on " 67738cfb907SFerenc Wagner "interface %s as it %s\n", dev->name, 6780e34e931SWANG Cong event == NETDEV_UNREGISTER ? "unregistered" : "released slaves"); 67917951f34SSatyam Sharma 680b5427c27SSatyam Sharma done: 68117951f34SSatyam Sharma return NOTIFY_DONE; 68217951f34SSatyam Sharma } 68317951f34SSatyam Sharma 68417951f34SSatyam Sharma static struct notifier_block netconsole_netdev_notifier = { 68517951f34SSatyam Sharma .notifier_call = netconsole_netdev_event, 68617951f34SSatyam Sharma }; 68717951f34SSatyam Sharma 6881da177e4SLinus Torvalds static void write_msg(struct console *con, const char *msg, unsigned int len) 6891da177e4SLinus Torvalds { 6901da177e4SLinus Torvalds int frag, left; 6911da177e4SLinus Torvalds unsigned long flags; 692b5427c27SSatyam Sharma struct netconsole_target *nt; 693b5427c27SSatyam Sharma const char *tmp; 6941da177e4SLinus Torvalds 695b5427c27SSatyam Sharma /* Avoid taking lock and disabling interrupts unnecessarily */ 696b5427c27SSatyam Sharma if (list_empty(&target_list)) 697b5427c27SSatyam Sharma return; 698b5427c27SSatyam Sharma 699b5427c27SSatyam Sharma spin_lock_irqsave(&target_list_lock, flags); 700b5427c27SSatyam Sharma list_for_each_entry(nt, &target_list, list) { 7010bcc1816SSatyam Sharma netconsole_target_get(nt); 7020bcc1816SSatyam Sharma if (nt->enabled && netif_running(nt->np.dev)) { 703b5427c27SSatyam Sharma /* 704b5427c27SSatyam Sharma * We nest this inside the for-each-target loop above 705b5427c27SSatyam Sharma * so that we're able to get as much logging out to 706b5427c27SSatyam Sharma * at least one target if we die inside here, instead 707b5427c27SSatyam Sharma * of unnecessarily keeping all targets in lock-step. 708b5427c27SSatyam Sharma */ 709b5427c27SSatyam Sharma tmp = msg; 7101da177e4SLinus Torvalds for (left = len; left;) { 7111da177e4SLinus Torvalds frag = min(left, MAX_PRINT_CHUNK); 712b5427c27SSatyam Sharma netpoll_send_udp(&nt->np, tmp, frag); 713b5427c27SSatyam Sharma tmp += frag; 7141da177e4SLinus Torvalds left -= frag; 7151da177e4SLinus Torvalds } 7161da177e4SLinus Torvalds } 7170bcc1816SSatyam Sharma netconsole_target_put(nt); 7180cc120beSSatyam Sharma } 719b5427c27SSatyam Sharma spin_unlock_irqrestore(&target_list_lock, flags); 720b5427c27SSatyam Sharma } 7211da177e4SLinus Torvalds 7221da177e4SLinus Torvalds static struct console netconsole = { 723d938ab44SRandy Dunlap .name = "netcon", 7240517deedSMichael Ellerman .flags = CON_ENABLED, 725d39badf0SSatyam Sharma .write = write_msg, 7261da177e4SLinus Torvalds }; 7271da177e4SLinus Torvalds 728d39badf0SSatyam Sharma static int __init init_netconsole(void) 7291da177e4SLinus Torvalds { 7300bcc1816SSatyam Sharma int err; 731b5427c27SSatyam Sharma struct netconsole_target *nt, *tmp; 732b5427c27SSatyam Sharma unsigned long flags; 733b5427c27SSatyam Sharma char *target_config; 734b5427c27SSatyam Sharma char *input = config; 735b41848b6SStephen Hemminger 7360bcc1816SSatyam Sharma if (strnlen(input, MAX_PARAM_LENGTH)) { 737b5427c27SSatyam Sharma while ((target_config = strsep(&input, ";"))) { 7380bcc1816SSatyam Sharma nt = alloc_param_target(target_config); 739b5427c27SSatyam Sharma if (IS_ERR(nt)) { 740b5427c27SSatyam Sharma err = PTR_ERR(nt); 741b5427c27SSatyam Sharma goto fail; 742b5427c27SSatyam Sharma } 7430517deedSMichael Ellerman /* Dump existing printks when we register */ 7440517deedSMichael Ellerman netconsole.flags |= CON_PRINTBUFFER; 7450517deedSMichael Ellerman 746b5427c27SSatyam Sharma spin_lock_irqsave(&target_list_lock, flags); 747b5427c27SSatyam Sharma list_add(&nt->list, &target_list); 748b5427c27SSatyam Sharma spin_unlock_irqrestore(&target_list_lock, flags); 749b5427c27SSatyam Sharma } 7500bcc1816SSatyam Sharma } 7511da177e4SLinus Torvalds 75217951f34SSatyam Sharma err = register_netdevice_notifier(&netconsole_netdev_notifier); 75317951f34SSatyam Sharma if (err) 754b5427c27SSatyam Sharma goto fail; 75517951f34SSatyam Sharma 7560bcc1816SSatyam Sharma err = dynamic_netconsole_init(); 7570bcc1816SSatyam Sharma if (err) 7580bcc1816SSatyam Sharma goto undonotifier; 7590bcc1816SSatyam Sharma 7601da177e4SLinus Torvalds register_console(&netconsole); 7611da177e4SLinus Torvalds printk(KERN_INFO "netconsole: network logging started\n"); 762d39badf0SSatyam Sharma 763d39badf0SSatyam Sharma return err; 764b5427c27SSatyam Sharma 7650bcc1816SSatyam Sharma undonotifier: 7660bcc1816SSatyam Sharma unregister_netdevice_notifier(&netconsole_netdev_notifier); 7670bcc1816SSatyam Sharma 768b5427c27SSatyam Sharma fail: 769b5427c27SSatyam Sharma printk(KERN_ERR "netconsole: cleaning up\n"); 770b5427c27SSatyam Sharma 771b5427c27SSatyam Sharma /* 7720bcc1816SSatyam Sharma * Remove all targets and destroy them (only targets created 7730bcc1816SSatyam Sharma * from the boot/module option exist here). Skipping the list 774b5427c27SSatyam Sharma * lock is safe here, and netpoll_cleanup() will sleep. 775b5427c27SSatyam Sharma */ 776b5427c27SSatyam Sharma list_for_each_entry_safe(nt, tmp, &target_list, list) { 777b5427c27SSatyam Sharma list_del(&nt->list); 7780bcc1816SSatyam Sharma free_param_target(nt); 779b5427c27SSatyam Sharma } 780b5427c27SSatyam Sharma 781b5427c27SSatyam Sharma return err; 7821da177e4SLinus Torvalds } 7831da177e4SLinus Torvalds 784d39badf0SSatyam Sharma static void __exit cleanup_netconsole(void) 7851da177e4SLinus Torvalds { 786b5427c27SSatyam Sharma struct netconsole_target *nt, *tmp; 787df180e36SSatyam Sharma 7881da177e4SLinus Torvalds unregister_console(&netconsole); 7890bcc1816SSatyam Sharma dynamic_netconsole_exit(); 79017951f34SSatyam Sharma unregister_netdevice_notifier(&netconsole_netdev_notifier); 791b5427c27SSatyam Sharma 792b5427c27SSatyam Sharma /* 7930bcc1816SSatyam Sharma * Targets created via configfs pin references on our module 7940bcc1816SSatyam Sharma * and would first be rmdir(2)'ed from userspace. We reach 7950bcc1816SSatyam Sharma * here only when they are already destroyed, and only those 7960bcc1816SSatyam Sharma * created from the boot/module option are left, so remove and 7970bcc1816SSatyam Sharma * destroy them. Skipping the list lock is safe here, and 7980bcc1816SSatyam Sharma * netpoll_cleanup() will sleep. 799b5427c27SSatyam Sharma */ 800b5427c27SSatyam Sharma list_for_each_entry_safe(nt, tmp, &target_list, list) { 801b5427c27SSatyam Sharma list_del(&nt->list); 8020bcc1816SSatyam Sharma free_param_target(nt); 803b5427c27SSatyam Sharma } 8041da177e4SLinus Torvalds } 8051da177e4SLinus Torvalds 8061da177e4SLinus Torvalds module_init(init_netconsole); 8071da177e4SLinus Torvalds module_exit(cleanup_netconsole); 808