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 3722ded577SJoe Perches #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 3822ded577SJoe Perches 391da177e4SLinus Torvalds #include <linux/mm.h> 401da177e4SLinus Torvalds #include <linux/init.h> 411da177e4SLinus Torvalds #include <linux/module.h> 425a0e3ad6STejun Heo #include <linux/slab.h> 431da177e4SLinus Torvalds #include <linux/console.h> 441da177e4SLinus Torvalds #include <linux/moduleparam.h> 454cd5773aSAndy Shevchenko #include <linux/kernel.h> 461da177e4SLinus Torvalds #include <linux/string.h> 471da177e4SLinus Torvalds #include <linux/netpoll.h> 480bcc1816SSatyam Sharma #include <linux/inet.h> 490bcc1816SSatyam Sharma #include <linux/configfs.h> 501da177e4SLinus Torvalds 511da177e4SLinus Torvalds MODULE_AUTHOR("Maintainer: Matt Mackall <mpm@selenic.com>"); 521da177e4SLinus Torvalds MODULE_DESCRIPTION("Console driver for network interfaces"); 531da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 541da177e4SLinus Torvalds 55d39badf0SSatyam Sharma #define MAX_PARAM_LENGTH 256 56d39badf0SSatyam Sharma #define MAX_PRINT_CHUNK 1000 57d39badf0SSatyam Sharma 58d39badf0SSatyam Sharma static char config[MAX_PARAM_LENGTH]; 59d39badf0SSatyam Sharma module_param_string(netconsole, config, MAX_PARAM_LENGTH, 0); 6061a2d07dSNiels de Vos MODULE_PARM_DESC(netconsole, " netconsole=[src-port]@[src-ip]/[dev],[tgt-port]@<tgt-ip>/[tgt-macaddr]"); 611da177e4SLinus Torvalds 62c1a60851SAmerigo Wang static bool oops_only = false; 63c1a60851SAmerigo Wang module_param(oops_only, bool, 0600); 64c1a60851SAmerigo Wang MODULE_PARM_DESC(oops_only, "Only log oops messages"); 65c1a60851SAmerigo Wang 66d2b60881SSatyam Sharma #ifndef MODULE 67d2b60881SSatyam Sharma static int __init option_setup(char *opt) 68d2b60881SSatyam Sharma { 69d2b60881SSatyam Sharma strlcpy(config, opt, MAX_PARAM_LENGTH); 70d2b60881SSatyam Sharma return 1; 71d2b60881SSatyam Sharma } 72d2b60881SSatyam Sharma __setup("netconsole=", option_setup); 73d2b60881SSatyam Sharma #endif /* MODULE */ 74d2b60881SSatyam Sharma 75b5427c27SSatyam Sharma /* Linked list of all configured targets */ 76b5427c27SSatyam Sharma static LIST_HEAD(target_list); 77b5427c27SSatyam Sharma 78b5427c27SSatyam Sharma /* This needs to be a spinlock because write_msg() cannot sleep */ 79b5427c27SSatyam Sharma static DEFINE_SPINLOCK(target_list_lock); 80b5427c27SSatyam Sharma 81df180e36SSatyam Sharma /** 82df180e36SSatyam Sharma * struct netconsole_target - Represents a configured netconsole target. 83b5427c27SSatyam Sharma * @list: Links this target into the target_list. 840bcc1816SSatyam Sharma * @item: Links us into the configfs subsystem hierarchy. 850bcc1816SSatyam Sharma * @enabled: On / off knob to enable / disable target. 860bcc1816SSatyam Sharma * Visible from userspace (read-write). 870bcc1816SSatyam Sharma * We maintain a strict 1:1 correspondence between this and 880bcc1816SSatyam Sharma * whether the corresponding netpoll is active or inactive. 890bcc1816SSatyam Sharma * Also, other parameters of a target may be modified at 900bcc1816SSatyam Sharma * runtime only when it is disabled (enabled == 0). 91df180e36SSatyam Sharma * @np: The netpoll structure for this target. 920bcc1816SSatyam Sharma * Contains the other userspace visible parameters: 930bcc1816SSatyam Sharma * dev_name (read-write) 940bcc1816SSatyam Sharma * local_port (read-write) 950bcc1816SSatyam Sharma * remote_port (read-write) 960bcc1816SSatyam Sharma * local_ip (read-write) 970bcc1816SSatyam Sharma * remote_ip (read-write) 980bcc1816SSatyam Sharma * local_mac (read-only) 990bcc1816SSatyam Sharma * remote_mac (read-write) 100df180e36SSatyam Sharma */ 101df180e36SSatyam Sharma struct netconsole_target { 102b5427c27SSatyam Sharma struct list_head list; 1030bcc1816SSatyam Sharma #ifdef CONFIG_NETCONSOLE_DYNAMIC 1040bcc1816SSatyam Sharma struct config_item item; 1050bcc1816SSatyam Sharma #endif 1060bcc1816SSatyam Sharma int enabled; 1077a163bfbSDan Aloni struct mutex mutex; 108df180e36SSatyam Sharma struct netpoll np; 109df180e36SSatyam Sharma }; 110df180e36SSatyam Sharma 1110bcc1816SSatyam Sharma #ifdef CONFIG_NETCONSOLE_DYNAMIC 1120bcc1816SSatyam Sharma 1130bcc1816SSatyam Sharma static struct configfs_subsystem netconsole_subsys; 1140bcc1816SSatyam Sharma 1150bcc1816SSatyam Sharma static int __init dynamic_netconsole_init(void) 1160bcc1816SSatyam Sharma { 1170bcc1816SSatyam Sharma config_group_init(&netconsole_subsys.su_group); 1180bcc1816SSatyam Sharma mutex_init(&netconsole_subsys.su_mutex); 1190bcc1816SSatyam Sharma return configfs_register_subsystem(&netconsole_subsys); 1200bcc1816SSatyam Sharma } 1210bcc1816SSatyam Sharma 1220bcc1816SSatyam Sharma static void __exit dynamic_netconsole_exit(void) 1230bcc1816SSatyam Sharma { 1240bcc1816SSatyam Sharma configfs_unregister_subsystem(&netconsole_subsys); 1250bcc1816SSatyam Sharma } 1260bcc1816SSatyam Sharma 1270bcc1816SSatyam Sharma /* 1280bcc1816SSatyam Sharma * Targets that were created by parsing the boot/module option string 1290bcc1816SSatyam Sharma * do not exist in the configfs hierarchy (and have NULL names) and will 1300bcc1816SSatyam Sharma * never go away, so make these a no-op for them. 1310bcc1816SSatyam Sharma */ 1320bcc1816SSatyam Sharma static void netconsole_target_get(struct netconsole_target *nt) 1330bcc1816SSatyam Sharma { 1340bcc1816SSatyam Sharma if (config_item_name(&nt->item)) 1350bcc1816SSatyam Sharma config_item_get(&nt->item); 1360bcc1816SSatyam Sharma } 1370bcc1816SSatyam Sharma 1380bcc1816SSatyam Sharma static void netconsole_target_put(struct netconsole_target *nt) 1390bcc1816SSatyam Sharma { 1400bcc1816SSatyam Sharma if (config_item_name(&nt->item)) 1410bcc1816SSatyam Sharma config_item_put(&nt->item); 1420bcc1816SSatyam Sharma } 1430bcc1816SSatyam Sharma 1440bcc1816SSatyam Sharma #else /* !CONFIG_NETCONSOLE_DYNAMIC */ 1450bcc1816SSatyam Sharma 1460bcc1816SSatyam Sharma static int __init dynamic_netconsole_init(void) 1470bcc1816SSatyam Sharma { 1480bcc1816SSatyam Sharma return 0; 1490bcc1816SSatyam Sharma } 1500bcc1816SSatyam Sharma 1510bcc1816SSatyam Sharma static void __exit dynamic_netconsole_exit(void) 1520bcc1816SSatyam Sharma { 1530bcc1816SSatyam Sharma } 1540bcc1816SSatyam Sharma 1550bcc1816SSatyam Sharma /* 1560bcc1816SSatyam Sharma * No danger of targets going away from under us when dynamic 1570bcc1816SSatyam Sharma * reconfigurability is off. 1580bcc1816SSatyam Sharma */ 1590bcc1816SSatyam Sharma static void netconsole_target_get(struct netconsole_target *nt) 1600bcc1816SSatyam Sharma { 1610bcc1816SSatyam Sharma } 1620bcc1816SSatyam Sharma 1630bcc1816SSatyam Sharma static void netconsole_target_put(struct netconsole_target *nt) 1640bcc1816SSatyam Sharma { 1650bcc1816SSatyam Sharma } 1660bcc1816SSatyam Sharma 1670bcc1816SSatyam Sharma #endif /* CONFIG_NETCONSOLE_DYNAMIC */ 1680bcc1816SSatyam Sharma 1690bcc1816SSatyam Sharma /* Allocate new target (from boot/module param) and setup netpoll for it */ 1700bcc1816SSatyam Sharma static struct netconsole_target *alloc_param_target(char *target_config) 171b5427c27SSatyam Sharma { 172b5427c27SSatyam Sharma int err = -ENOMEM; 173b5427c27SSatyam Sharma struct netconsole_target *nt; 174b5427c27SSatyam Sharma 1750bcc1816SSatyam Sharma /* 1760bcc1816SSatyam Sharma * Allocate and initialize with defaults. 1770bcc1816SSatyam Sharma * Note that these targets get their config_item fields zeroed-out. 1780bcc1816SSatyam Sharma */ 179b5427c27SSatyam Sharma nt = kzalloc(sizeof(*nt), GFP_KERNEL); 180e404decbSJoe Perches if (!nt) 181b5427c27SSatyam Sharma goto fail; 182b5427c27SSatyam Sharma 183b5427c27SSatyam Sharma nt->np.name = "netconsole"; 184b5427c27SSatyam Sharma strlcpy(nt->np.dev_name, "eth0", IFNAMSIZ); 185b5427c27SSatyam Sharma nt->np.local_port = 6665; 186b5427c27SSatyam Sharma nt->np.remote_port = 6666; 1877a163bfbSDan Aloni mutex_init(&nt->mutex); 188b5427c27SSatyam Sharma memset(nt->np.remote_mac, 0xff, ETH_ALEN); 189b5427c27SSatyam Sharma 190b5427c27SSatyam Sharma /* Parse parameters and setup netpoll */ 191b5427c27SSatyam Sharma err = netpoll_parse_options(&nt->np, target_config); 192b5427c27SSatyam Sharma if (err) 193b5427c27SSatyam Sharma goto fail; 194b5427c27SSatyam Sharma 195b5427c27SSatyam Sharma err = netpoll_setup(&nt->np); 196b5427c27SSatyam Sharma if (err) 197b5427c27SSatyam Sharma goto fail; 198b5427c27SSatyam Sharma 1990bcc1816SSatyam Sharma nt->enabled = 1; 2000bcc1816SSatyam Sharma 201b5427c27SSatyam Sharma return nt; 202b5427c27SSatyam Sharma 203b5427c27SSatyam Sharma fail: 204b5427c27SSatyam Sharma kfree(nt); 205b5427c27SSatyam Sharma return ERR_PTR(err); 206b5427c27SSatyam Sharma } 207b5427c27SSatyam Sharma 2080bcc1816SSatyam Sharma /* Cleanup netpoll for given target (from boot/module param) and free it */ 2090bcc1816SSatyam Sharma static void free_param_target(struct netconsole_target *nt) 210b5427c27SSatyam Sharma { 211b5427c27SSatyam Sharma netpoll_cleanup(&nt->np); 212b5427c27SSatyam Sharma kfree(nt); 213b5427c27SSatyam Sharma } 2141da177e4SLinus Torvalds 2150bcc1816SSatyam Sharma #ifdef CONFIG_NETCONSOLE_DYNAMIC 2160bcc1816SSatyam Sharma 2170bcc1816SSatyam Sharma /* 2180bcc1816SSatyam Sharma * Our subsystem hierarchy is: 2190bcc1816SSatyam Sharma * 2200bcc1816SSatyam Sharma * /sys/kernel/config/netconsole/ 2210bcc1816SSatyam Sharma * | 2220bcc1816SSatyam Sharma * <target>/ 2230bcc1816SSatyam Sharma * | enabled 2240bcc1816SSatyam Sharma * | dev_name 2250bcc1816SSatyam Sharma * | local_port 2260bcc1816SSatyam Sharma * | remote_port 2270bcc1816SSatyam Sharma * | local_ip 2280bcc1816SSatyam Sharma * | remote_ip 2290bcc1816SSatyam Sharma * | local_mac 2300bcc1816SSatyam Sharma * | remote_mac 2310bcc1816SSatyam Sharma * | 2320bcc1816SSatyam Sharma * <target>/... 2330bcc1816SSatyam Sharma */ 2340bcc1816SSatyam Sharma 2350bcc1816SSatyam Sharma struct netconsole_target_attr { 2360bcc1816SSatyam Sharma struct configfs_attribute attr; 2370bcc1816SSatyam Sharma ssize_t (*show)(struct netconsole_target *nt, 2380bcc1816SSatyam Sharma char *buf); 2390bcc1816SSatyam Sharma ssize_t (*store)(struct netconsole_target *nt, 2400bcc1816SSatyam Sharma const char *buf, 2410bcc1816SSatyam Sharma size_t count); 2420bcc1816SSatyam Sharma }; 2430bcc1816SSatyam Sharma 2440bcc1816SSatyam Sharma static struct netconsole_target *to_target(struct config_item *item) 2450bcc1816SSatyam Sharma { 2460bcc1816SSatyam Sharma return item ? 2470bcc1816SSatyam Sharma container_of(item, struct netconsole_target, item) : 2480bcc1816SSatyam Sharma NULL; 2490bcc1816SSatyam Sharma } 2500bcc1816SSatyam Sharma 2510bcc1816SSatyam Sharma /* 2520bcc1816SSatyam Sharma * Attribute operations for netconsole_target. 2530bcc1816SSatyam Sharma */ 2540bcc1816SSatyam Sharma 2550bcc1816SSatyam Sharma static ssize_t show_enabled(struct netconsole_target *nt, char *buf) 2560bcc1816SSatyam Sharma { 2570bcc1816SSatyam Sharma return snprintf(buf, PAGE_SIZE, "%d\n", nt->enabled); 2580bcc1816SSatyam Sharma } 2590bcc1816SSatyam Sharma 2600bcc1816SSatyam Sharma static ssize_t show_dev_name(struct netconsole_target *nt, char *buf) 2610bcc1816SSatyam Sharma { 2620bcc1816SSatyam Sharma return snprintf(buf, PAGE_SIZE, "%s\n", nt->np.dev_name); 2630bcc1816SSatyam Sharma } 2640bcc1816SSatyam Sharma 2650bcc1816SSatyam Sharma static ssize_t show_local_port(struct netconsole_target *nt, char *buf) 2660bcc1816SSatyam Sharma { 2670bcc1816SSatyam Sharma return snprintf(buf, PAGE_SIZE, "%d\n", nt->np.local_port); 2680bcc1816SSatyam Sharma } 2690bcc1816SSatyam Sharma 2700bcc1816SSatyam Sharma static ssize_t show_remote_port(struct netconsole_target *nt, char *buf) 2710bcc1816SSatyam Sharma { 2720bcc1816SSatyam Sharma return snprintf(buf, PAGE_SIZE, "%d\n", nt->np.remote_port); 2730bcc1816SSatyam Sharma } 2740bcc1816SSatyam Sharma 2750bcc1816SSatyam Sharma static ssize_t show_local_ip(struct netconsole_target *nt, char *buf) 2760bcc1816SSatyam Sharma { 277b3d936f3SCong Wang if (nt->np.ipv6) 278b3d936f3SCong Wang return snprintf(buf, PAGE_SIZE, "%pI6c\n", &nt->np.local_ip.in6); 279b3d936f3SCong Wang else 280e7557af5SHarvey Harrison return snprintf(buf, PAGE_SIZE, "%pI4\n", &nt->np.local_ip); 2810bcc1816SSatyam Sharma } 2820bcc1816SSatyam Sharma 2830bcc1816SSatyam Sharma static ssize_t show_remote_ip(struct netconsole_target *nt, char *buf) 2840bcc1816SSatyam Sharma { 285b3d936f3SCong Wang if (nt->np.ipv6) 286b3d936f3SCong Wang return snprintf(buf, PAGE_SIZE, "%pI6c\n", &nt->np.remote_ip.in6); 287b3d936f3SCong Wang else 288e7557af5SHarvey Harrison return snprintf(buf, PAGE_SIZE, "%pI4\n", &nt->np.remote_ip); 2890bcc1816SSatyam Sharma } 2900bcc1816SSatyam Sharma 2910bcc1816SSatyam Sharma static ssize_t show_local_mac(struct netconsole_target *nt, char *buf) 2920bcc1816SSatyam Sharma { 29309538641SStephen Hemminger struct net_device *dev = nt->np.dev; 294e174961cSJohannes Berg static const u8 bcast[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 29509538641SStephen Hemminger 296e174961cSJohannes Berg return snprintf(buf, PAGE_SIZE, "%pM\n", dev ? dev->dev_addr : bcast); 2970bcc1816SSatyam Sharma } 2980bcc1816SSatyam Sharma 2990bcc1816SSatyam Sharma static ssize_t show_remote_mac(struct netconsole_target *nt, char *buf) 3000bcc1816SSatyam Sharma { 301e174961cSJohannes Berg return snprintf(buf, PAGE_SIZE, "%pM\n", nt->np.remote_mac); 3020bcc1816SSatyam Sharma } 3030bcc1816SSatyam Sharma 3040bcc1816SSatyam Sharma /* 3050bcc1816SSatyam Sharma * This one is special -- targets created through the configfs interface 3060bcc1816SSatyam Sharma * are not enabled (and the corresponding netpoll activated) by default. 3070bcc1816SSatyam Sharma * The user is expected to set the desired parameters first (which 3080bcc1816SSatyam Sharma * would enable him to dynamically add new netpoll targets for new 3090bcc1816SSatyam Sharma * network interfaces as and when they come up). 3100bcc1816SSatyam Sharma */ 3110bcc1816SSatyam Sharma static ssize_t store_enabled(struct netconsole_target *nt, 3120bcc1816SSatyam Sharma const char *buf, 3130bcc1816SSatyam Sharma size_t count) 3140bcc1816SSatyam Sharma { 31599f823f9SAlexey Dobriyan int enabled; 3160bcc1816SSatyam Sharma int err; 3170bcc1816SSatyam Sharma 31899f823f9SAlexey Dobriyan err = kstrtoint(buf, 10, &enabled); 31999f823f9SAlexey Dobriyan if (err < 0) 32099f823f9SAlexey Dobriyan return err; 32199f823f9SAlexey Dobriyan if (enabled < 0 || enabled > 1) 32299f823f9SAlexey Dobriyan return -EINVAL; 323d5123480SGao feng if (enabled == nt->enabled) { 32422ded577SJoe Perches pr_info("network logging has already %s\n", 325d5123480SGao feng nt->enabled ? "started" : "stopped"); 326d5123480SGao feng return -EINVAL; 327d5123480SGao feng } 3280bcc1816SSatyam Sharma 3297a163bfbSDan Aloni mutex_lock(&nt->mutex); 3300bcc1816SSatyam Sharma if (enabled) { /* 1 */ 3310bcc1816SSatyam Sharma 3320bcc1816SSatyam Sharma /* 3330bcc1816SSatyam Sharma * Skip netpoll_parse_options() -- all the attributes are 3340bcc1816SSatyam Sharma * already configured via configfs. Just print them out. 3350bcc1816SSatyam Sharma */ 3360bcc1816SSatyam Sharma netpoll_print_options(&nt->np); 3370bcc1816SSatyam Sharma 3380bcc1816SSatyam Sharma err = netpoll_setup(&nt->np); 3397a163bfbSDan Aloni if (err) { 3407a163bfbSDan Aloni mutex_unlock(&nt->mutex); 3410bcc1816SSatyam Sharma return err; 3427a163bfbSDan Aloni } 3430bcc1816SSatyam Sharma 34422ded577SJoe Perches pr_info("network logging started\n"); 3450bcc1816SSatyam Sharma 3460bcc1816SSatyam Sharma } else { /* 0 */ 3470bcc1816SSatyam Sharma netpoll_cleanup(&nt->np); 3480bcc1816SSatyam Sharma } 3490bcc1816SSatyam Sharma 3500bcc1816SSatyam Sharma nt->enabled = enabled; 3517a163bfbSDan Aloni mutex_unlock(&nt->mutex); 3520bcc1816SSatyam Sharma 3530bcc1816SSatyam Sharma return strnlen(buf, count); 3540bcc1816SSatyam Sharma } 3550bcc1816SSatyam Sharma 3560bcc1816SSatyam Sharma static ssize_t store_dev_name(struct netconsole_target *nt, 3570bcc1816SSatyam Sharma const char *buf, 3580bcc1816SSatyam Sharma size_t count) 3590bcc1816SSatyam Sharma { 3600bcc1816SSatyam Sharma size_t len; 3610bcc1816SSatyam Sharma 3620bcc1816SSatyam Sharma if (nt->enabled) { 36322ded577SJoe Perches pr_err("target (%s) is enabled, disable to update parameters\n", 3640bcc1816SSatyam Sharma config_item_name(&nt->item)); 3650bcc1816SSatyam Sharma return -EINVAL; 3660bcc1816SSatyam Sharma } 3670bcc1816SSatyam Sharma 3680bcc1816SSatyam Sharma strlcpy(nt->np.dev_name, buf, IFNAMSIZ); 3690bcc1816SSatyam Sharma 3700bcc1816SSatyam Sharma /* Get rid of possible trailing newline from echo(1) */ 3710bcc1816SSatyam Sharma len = strnlen(nt->np.dev_name, IFNAMSIZ); 3720bcc1816SSatyam Sharma if (nt->np.dev_name[len - 1] == '\n') 3730bcc1816SSatyam Sharma nt->np.dev_name[len - 1] = '\0'; 3740bcc1816SSatyam Sharma 3750bcc1816SSatyam Sharma return strnlen(buf, count); 3760bcc1816SSatyam Sharma } 3770bcc1816SSatyam Sharma 3780bcc1816SSatyam Sharma static ssize_t store_local_port(struct netconsole_target *nt, 3790bcc1816SSatyam Sharma const char *buf, 3800bcc1816SSatyam Sharma size_t count) 3810bcc1816SSatyam Sharma { 38299f823f9SAlexey Dobriyan int rv; 3830bcc1816SSatyam Sharma 3840bcc1816SSatyam Sharma if (nt->enabled) { 38522ded577SJoe Perches pr_err("target (%s) is enabled, disable to update parameters\n", 3860bcc1816SSatyam Sharma config_item_name(&nt->item)); 3870bcc1816SSatyam Sharma return -EINVAL; 3880bcc1816SSatyam Sharma } 3890bcc1816SSatyam Sharma 39099f823f9SAlexey Dobriyan rv = kstrtou16(buf, 10, &nt->np.local_port); 39199f823f9SAlexey Dobriyan if (rv < 0) 39299f823f9SAlexey Dobriyan return rv; 3930bcc1816SSatyam Sharma return strnlen(buf, count); 3940bcc1816SSatyam Sharma } 3950bcc1816SSatyam Sharma 3960bcc1816SSatyam Sharma static ssize_t store_remote_port(struct netconsole_target *nt, 3970bcc1816SSatyam Sharma const char *buf, 3980bcc1816SSatyam Sharma size_t count) 3990bcc1816SSatyam Sharma { 40099f823f9SAlexey Dobriyan int rv; 4010bcc1816SSatyam Sharma 4020bcc1816SSatyam Sharma if (nt->enabled) { 40322ded577SJoe Perches pr_err("target (%s) is enabled, disable to update parameters\n", 4040bcc1816SSatyam Sharma config_item_name(&nt->item)); 4050bcc1816SSatyam Sharma return -EINVAL; 4060bcc1816SSatyam Sharma } 4070bcc1816SSatyam Sharma 40899f823f9SAlexey Dobriyan rv = kstrtou16(buf, 10, &nt->np.remote_port); 40999f823f9SAlexey Dobriyan if (rv < 0) 41099f823f9SAlexey Dobriyan return rv; 4110bcc1816SSatyam Sharma return strnlen(buf, count); 4120bcc1816SSatyam Sharma } 4130bcc1816SSatyam Sharma 4140bcc1816SSatyam Sharma static ssize_t store_local_ip(struct netconsole_target *nt, 4150bcc1816SSatyam Sharma const char *buf, 4160bcc1816SSatyam Sharma size_t count) 4170bcc1816SSatyam Sharma { 4180bcc1816SSatyam Sharma if (nt->enabled) { 41922ded577SJoe Perches pr_err("target (%s) is enabled, disable to update parameters\n", 4200bcc1816SSatyam Sharma config_item_name(&nt->item)); 4210bcc1816SSatyam Sharma return -EINVAL; 4220bcc1816SSatyam Sharma } 4230bcc1816SSatyam Sharma 424b3d936f3SCong Wang if (strnchr(buf, count, ':')) { 425b3d936f3SCong Wang const char *end; 426b3d936f3SCong Wang if (in6_pton(buf, count, nt->np.local_ip.in6.s6_addr, -1, &end) > 0) { 427b3d936f3SCong Wang if (*end && *end != '\n') { 42822ded577SJoe Perches pr_err("invalid IPv6 address at: <%c>\n", *end); 429b3d936f3SCong Wang return -EINVAL; 430b3d936f3SCong Wang } 431b3d936f3SCong Wang nt->np.ipv6 = true; 432b3d936f3SCong Wang } else 433b3d936f3SCong Wang return -EINVAL; 434b3d936f3SCong Wang } else { 435b3d936f3SCong Wang if (!nt->np.ipv6) { 436b7394d24SCong Wang nt->np.local_ip.ip = in_aton(buf); 437b3d936f3SCong Wang } else 438b3d936f3SCong Wang return -EINVAL; 439b3d936f3SCong Wang } 4400bcc1816SSatyam Sharma 4410bcc1816SSatyam Sharma return strnlen(buf, count); 4420bcc1816SSatyam Sharma } 4430bcc1816SSatyam Sharma 4440bcc1816SSatyam Sharma static ssize_t store_remote_ip(struct netconsole_target *nt, 4450bcc1816SSatyam Sharma const char *buf, 4460bcc1816SSatyam Sharma size_t count) 4470bcc1816SSatyam Sharma { 4480bcc1816SSatyam Sharma if (nt->enabled) { 44922ded577SJoe Perches pr_err("target (%s) is enabled, disable to update parameters\n", 4500bcc1816SSatyam Sharma config_item_name(&nt->item)); 4510bcc1816SSatyam Sharma return -EINVAL; 4520bcc1816SSatyam Sharma } 4530bcc1816SSatyam Sharma 454b3d936f3SCong Wang if (strnchr(buf, count, ':')) { 455b3d936f3SCong Wang const char *end; 456b3d936f3SCong Wang if (in6_pton(buf, count, nt->np.remote_ip.in6.s6_addr, -1, &end) > 0) { 457b3d936f3SCong Wang if (*end && *end != '\n') { 45822ded577SJoe Perches pr_err("invalid IPv6 address at: <%c>\n", *end); 459b3d936f3SCong Wang return -EINVAL; 460b3d936f3SCong Wang } 461b3d936f3SCong Wang nt->np.ipv6 = true; 462b3d936f3SCong Wang } else 463b3d936f3SCong Wang return -EINVAL; 464b3d936f3SCong Wang } else { 465b3d936f3SCong Wang if (!nt->np.ipv6) { 466b7394d24SCong Wang nt->np.remote_ip.ip = in_aton(buf); 467b3d936f3SCong Wang } else 468b3d936f3SCong Wang return -EINVAL; 469b3d936f3SCong Wang } 4700bcc1816SSatyam Sharma 4710bcc1816SSatyam Sharma return strnlen(buf, count); 4720bcc1816SSatyam Sharma } 4730bcc1816SSatyam Sharma 4740bcc1816SSatyam Sharma static ssize_t store_remote_mac(struct netconsole_target *nt, 4750bcc1816SSatyam Sharma const char *buf, 4760bcc1816SSatyam Sharma size_t count) 4770bcc1816SSatyam Sharma { 4780bcc1816SSatyam Sharma u8 remote_mac[ETH_ALEN]; 4790bcc1816SSatyam Sharma 4800bcc1816SSatyam Sharma if (nt->enabled) { 48122ded577SJoe Perches pr_err("target (%s) is enabled, disable to update parameters\n", 4820bcc1816SSatyam Sharma config_item_name(&nt->item)); 4830bcc1816SSatyam Sharma return -EINVAL; 4840bcc1816SSatyam Sharma } 4850bcc1816SSatyam Sharma 4864940fc88SAlexey Dobriyan if (!mac_pton(buf, remote_mac)) 4874940fc88SAlexey Dobriyan return -EINVAL; 4884940fc88SAlexey Dobriyan if (buf[3 * ETH_ALEN - 1] && buf[3 * ETH_ALEN - 1] != '\n') 4894940fc88SAlexey Dobriyan return -EINVAL; 4900bcc1816SSatyam Sharma memcpy(nt->np.remote_mac, remote_mac, ETH_ALEN); 4910bcc1816SSatyam Sharma 4920bcc1816SSatyam Sharma return strnlen(buf, count); 4930bcc1816SSatyam Sharma } 4940bcc1816SSatyam Sharma 4950bcc1816SSatyam Sharma /* 4960bcc1816SSatyam Sharma * Attribute definitions for netconsole_target. 4970bcc1816SSatyam Sharma */ 4980bcc1816SSatyam Sharma 4990bcc1816SSatyam Sharma #define NETCONSOLE_TARGET_ATTR_RO(_name) \ 5000bcc1816SSatyam Sharma static struct netconsole_target_attr netconsole_target_##_name = \ 5010bcc1816SSatyam Sharma __CONFIGFS_ATTR(_name, S_IRUGO, show_##_name, NULL) 5020bcc1816SSatyam Sharma 5030bcc1816SSatyam Sharma #define NETCONSOLE_TARGET_ATTR_RW(_name) \ 5040bcc1816SSatyam Sharma static struct netconsole_target_attr netconsole_target_##_name = \ 5050bcc1816SSatyam Sharma __CONFIGFS_ATTR(_name, S_IRUGO | S_IWUSR, show_##_name, store_##_name) 5060bcc1816SSatyam Sharma 5070bcc1816SSatyam Sharma NETCONSOLE_TARGET_ATTR_RW(enabled); 5080bcc1816SSatyam Sharma NETCONSOLE_TARGET_ATTR_RW(dev_name); 5090bcc1816SSatyam Sharma NETCONSOLE_TARGET_ATTR_RW(local_port); 5100bcc1816SSatyam Sharma NETCONSOLE_TARGET_ATTR_RW(remote_port); 5110bcc1816SSatyam Sharma NETCONSOLE_TARGET_ATTR_RW(local_ip); 5120bcc1816SSatyam Sharma NETCONSOLE_TARGET_ATTR_RW(remote_ip); 5130bcc1816SSatyam Sharma NETCONSOLE_TARGET_ATTR_RO(local_mac); 5140bcc1816SSatyam Sharma NETCONSOLE_TARGET_ATTR_RW(remote_mac); 5150bcc1816SSatyam Sharma 5160bcc1816SSatyam Sharma static struct configfs_attribute *netconsole_target_attrs[] = { 5170bcc1816SSatyam Sharma &netconsole_target_enabled.attr, 5180bcc1816SSatyam Sharma &netconsole_target_dev_name.attr, 5190bcc1816SSatyam Sharma &netconsole_target_local_port.attr, 5200bcc1816SSatyam Sharma &netconsole_target_remote_port.attr, 5210bcc1816SSatyam Sharma &netconsole_target_local_ip.attr, 5220bcc1816SSatyam Sharma &netconsole_target_remote_ip.attr, 5230bcc1816SSatyam Sharma &netconsole_target_local_mac.attr, 5240bcc1816SSatyam Sharma &netconsole_target_remote_mac.attr, 5250bcc1816SSatyam Sharma NULL, 5260bcc1816SSatyam Sharma }; 5270bcc1816SSatyam Sharma 5280bcc1816SSatyam Sharma /* 5290bcc1816SSatyam Sharma * Item operations and type for netconsole_target. 5300bcc1816SSatyam Sharma */ 5310bcc1816SSatyam Sharma 5320bcc1816SSatyam Sharma static void netconsole_target_release(struct config_item *item) 5330bcc1816SSatyam Sharma { 5340bcc1816SSatyam Sharma kfree(to_target(item)); 5350bcc1816SSatyam Sharma } 5360bcc1816SSatyam Sharma 5370bcc1816SSatyam Sharma static ssize_t netconsole_target_attr_show(struct config_item *item, 5380bcc1816SSatyam Sharma struct configfs_attribute *attr, 5390bcc1816SSatyam Sharma char *buf) 5400bcc1816SSatyam Sharma { 5410bcc1816SSatyam Sharma ssize_t ret = -EINVAL; 5420bcc1816SSatyam Sharma struct netconsole_target *nt = to_target(item); 5430bcc1816SSatyam Sharma struct netconsole_target_attr *na = 5440bcc1816SSatyam Sharma container_of(attr, struct netconsole_target_attr, attr); 5450bcc1816SSatyam Sharma 5460bcc1816SSatyam Sharma if (na->show) 5470bcc1816SSatyam Sharma ret = na->show(nt, buf); 5480bcc1816SSatyam Sharma 5490bcc1816SSatyam Sharma return ret; 5500bcc1816SSatyam Sharma } 5510bcc1816SSatyam Sharma 5520bcc1816SSatyam Sharma static ssize_t netconsole_target_attr_store(struct config_item *item, 5530bcc1816SSatyam Sharma struct configfs_attribute *attr, 5540bcc1816SSatyam Sharma const char *buf, 5550bcc1816SSatyam Sharma size_t count) 5560bcc1816SSatyam Sharma { 5570bcc1816SSatyam Sharma ssize_t ret = -EINVAL; 5580bcc1816SSatyam Sharma struct netconsole_target *nt = to_target(item); 5590bcc1816SSatyam Sharma struct netconsole_target_attr *na = 5600bcc1816SSatyam Sharma container_of(attr, struct netconsole_target_attr, attr); 5610bcc1816SSatyam Sharma 5620bcc1816SSatyam Sharma if (na->store) 5630bcc1816SSatyam Sharma ret = na->store(nt, buf, count); 5640bcc1816SSatyam Sharma 5650bcc1816SSatyam Sharma return ret; 5660bcc1816SSatyam Sharma } 5670bcc1816SSatyam Sharma 5680bcc1816SSatyam Sharma static struct configfs_item_operations netconsole_target_item_ops = { 5690bcc1816SSatyam Sharma .release = netconsole_target_release, 5700bcc1816SSatyam Sharma .show_attribute = netconsole_target_attr_show, 5710bcc1816SSatyam Sharma .store_attribute = netconsole_target_attr_store, 5720bcc1816SSatyam Sharma }; 5730bcc1816SSatyam Sharma 5740bcc1816SSatyam Sharma static struct config_item_type netconsole_target_type = { 5750bcc1816SSatyam Sharma .ct_attrs = netconsole_target_attrs, 5760bcc1816SSatyam Sharma .ct_item_ops = &netconsole_target_item_ops, 5770bcc1816SSatyam Sharma .ct_owner = THIS_MODULE, 5780bcc1816SSatyam Sharma }; 5790bcc1816SSatyam Sharma 5800bcc1816SSatyam Sharma /* 5810bcc1816SSatyam Sharma * Group operations and type for netconsole_subsys. 5820bcc1816SSatyam Sharma */ 5830bcc1816SSatyam Sharma 584f89ab861SJoel Becker static struct config_item *make_netconsole_target(struct config_group *group, 585f89ab861SJoel Becker const char *name) 5860bcc1816SSatyam Sharma { 5870bcc1816SSatyam Sharma unsigned long flags; 5880bcc1816SSatyam Sharma struct netconsole_target *nt; 5890bcc1816SSatyam Sharma 5900bcc1816SSatyam Sharma /* 5910bcc1816SSatyam Sharma * Allocate and initialize with defaults. 5920bcc1816SSatyam Sharma * Target is disabled at creation (enabled == 0). 5930bcc1816SSatyam Sharma */ 5940bcc1816SSatyam Sharma nt = kzalloc(sizeof(*nt), GFP_KERNEL); 595e404decbSJoe Perches if (!nt) 596a6795e9eSJoel Becker return ERR_PTR(-ENOMEM); 5970bcc1816SSatyam Sharma 5980bcc1816SSatyam Sharma nt->np.name = "netconsole"; 5990bcc1816SSatyam Sharma strlcpy(nt->np.dev_name, "eth0", IFNAMSIZ); 6000bcc1816SSatyam Sharma nt->np.local_port = 6665; 6010bcc1816SSatyam Sharma nt->np.remote_port = 6666; 6027a163bfbSDan Aloni mutex_init(&nt->mutex); 6030bcc1816SSatyam Sharma memset(nt->np.remote_mac, 0xff, ETH_ALEN); 6040bcc1816SSatyam Sharma 6050bcc1816SSatyam Sharma /* Initialize the config_item member */ 6060bcc1816SSatyam Sharma config_item_init_type_name(&nt->item, name, &netconsole_target_type); 6070bcc1816SSatyam Sharma 6080bcc1816SSatyam Sharma /* Adding, but it is disabled */ 6090bcc1816SSatyam Sharma spin_lock_irqsave(&target_list_lock, flags); 6100bcc1816SSatyam Sharma list_add(&nt->list, &target_list); 6110bcc1816SSatyam Sharma spin_unlock_irqrestore(&target_list_lock, flags); 6120bcc1816SSatyam Sharma 613f89ab861SJoel Becker return &nt->item; 6140bcc1816SSatyam Sharma } 6150bcc1816SSatyam Sharma 6160bcc1816SSatyam Sharma static void drop_netconsole_target(struct config_group *group, 6170bcc1816SSatyam Sharma struct config_item *item) 6180bcc1816SSatyam Sharma { 6190bcc1816SSatyam Sharma unsigned long flags; 6200bcc1816SSatyam Sharma struct netconsole_target *nt = to_target(item); 6210bcc1816SSatyam Sharma 6220bcc1816SSatyam Sharma spin_lock_irqsave(&target_list_lock, flags); 6230bcc1816SSatyam Sharma list_del(&nt->list); 6240bcc1816SSatyam Sharma spin_unlock_irqrestore(&target_list_lock, flags); 6250bcc1816SSatyam Sharma 6260bcc1816SSatyam Sharma /* 6270bcc1816SSatyam Sharma * The target may have never been enabled, or was manually disabled 6280bcc1816SSatyam Sharma * before being removed so netpoll may have already been cleaned up. 6290bcc1816SSatyam Sharma */ 6300bcc1816SSatyam Sharma if (nt->enabled) 6310bcc1816SSatyam Sharma netpoll_cleanup(&nt->np); 6320bcc1816SSatyam Sharma 6330bcc1816SSatyam Sharma config_item_put(&nt->item); 6340bcc1816SSatyam Sharma } 6350bcc1816SSatyam Sharma 6360bcc1816SSatyam Sharma static struct configfs_group_operations netconsole_subsys_group_ops = { 6370bcc1816SSatyam Sharma .make_item = make_netconsole_target, 6380bcc1816SSatyam Sharma .drop_item = drop_netconsole_target, 6390bcc1816SSatyam Sharma }; 6400bcc1816SSatyam Sharma 6410bcc1816SSatyam Sharma static struct config_item_type netconsole_subsys_type = { 6420bcc1816SSatyam Sharma .ct_group_ops = &netconsole_subsys_group_ops, 6430bcc1816SSatyam Sharma .ct_owner = THIS_MODULE, 6440bcc1816SSatyam Sharma }; 6450bcc1816SSatyam Sharma 6460bcc1816SSatyam Sharma /* The netconsole configfs subsystem */ 6470bcc1816SSatyam Sharma static struct configfs_subsystem netconsole_subsys = { 6480bcc1816SSatyam Sharma .su_group = { 6490bcc1816SSatyam Sharma .cg_item = { 6500bcc1816SSatyam Sharma .ci_namebuf = "netconsole", 6510bcc1816SSatyam Sharma .ci_type = &netconsole_subsys_type, 6520bcc1816SSatyam Sharma }, 6530bcc1816SSatyam Sharma }, 6540bcc1816SSatyam Sharma }; 6550bcc1816SSatyam Sharma 6560bcc1816SSatyam Sharma #endif /* CONFIG_NETCONSOLE_DYNAMIC */ 6570bcc1816SSatyam Sharma 65817951f34SSatyam Sharma /* Handle network interface device notifications */ 65917951f34SSatyam Sharma static int netconsole_netdev_event(struct notifier_block *this, 660351638e7SJiri Pirko unsigned long event, void *ptr) 66117951f34SSatyam Sharma { 662b5427c27SSatyam Sharma unsigned long flags; 663b5427c27SSatyam Sharma struct netconsole_target *nt; 664351638e7SJiri Pirko struct net_device *dev = netdev_notifier_info_to_dev(ptr); 665141dfba3SFerenc Wagner bool stopped = false; 66617951f34SSatyam Sharma 6670e34e931SWANG Cong if (!(event == NETDEV_CHANGENAME || event == NETDEV_UNREGISTER || 668daf9209bSAmerigo Wang event == NETDEV_RELEASE || event == NETDEV_JOIN)) 669b5427c27SSatyam Sharma goto done; 670b5427c27SSatyam Sharma 671b5427c27SSatyam Sharma spin_lock_irqsave(&target_list_lock, flags); 6723f315befSVeaceslav Falico restart: 673b5427c27SSatyam Sharma list_for_each_entry(nt, &target_list, list) { 6740bcc1816SSatyam Sharma netconsole_target_get(nt); 67517951f34SSatyam Sharma if (nt->np.dev == dev) { 67617951f34SSatyam Sharma switch (event) { 67717951f34SSatyam Sharma case NETDEV_CHANGENAME: 67817951f34SSatyam Sharma strlcpy(nt->np.dev_name, dev->name, IFNAMSIZ); 67917951f34SSatyam Sharma break; 680daf9209bSAmerigo Wang case NETDEV_RELEASE: 6818d8fc29dSAmerigo Wang case NETDEV_JOIN: 6822382b15bSBruno Prémont case NETDEV_UNREGISTER: 683c71380ffSNikolay Aleksandrov /* rtnl_lock already held 6843f315befSVeaceslav Falico * we might sleep in __netpoll_cleanup() 6853b410a31SNeil Horman */ 6863f315befSVeaceslav Falico spin_unlock_irqrestore(&target_list_lock, flags); 6877a163bfbSDan Aloni 6883b410a31SNeil Horman __netpoll_cleanup(&nt->np); 6897a163bfbSDan Aloni 6903f315befSVeaceslav Falico spin_lock_irqsave(&target_list_lock, flags); 6913b410a31SNeil Horman dev_put(nt->np.dev); 6923b410a31SNeil Horman nt->np.dev = NULL; 6932382b15bSBruno Prémont nt->enabled = 0; 694141dfba3SFerenc Wagner stopped = true; 6953f315befSVeaceslav Falico netconsole_target_put(nt); 6963f315befSVeaceslav Falico goto restart; 69717951f34SSatyam Sharma } 69817951f34SSatyam Sharma } 6990bcc1816SSatyam Sharma netconsole_target_put(nt); 700b5427c27SSatyam Sharma } 701b5427c27SSatyam Sharma spin_unlock_irqrestore(&target_list_lock, flags); 7028d8fc29dSAmerigo Wang if (stopped) { 70322ded577SJoe Perches const char *msg = "had an event"; 7048d8fc29dSAmerigo Wang switch (event) { 7058d8fc29dSAmerigo Wang case NETDEV_UNREGISTER: 70622ded577SJoe Perches msg = "unregistered"; 7078d8fc29dSAmerigo Wang break; 708daf9209bSAmerigo Wang case NETDEV_RELEASE: 70922ded577SJoe Perches msg = "released slaves"; 7108d8fc29dSAmerigo Wang break; 7118d8fc29dSAmerigo Wang case NETDEV_JOIN: 71222ded577SJoe Perches msg = "is joining a master device"; 7138d8fc29dSAmerigo Wang break; 7148d8fc29dSAmerigo Wang } 71522ded577SJoe Perches pr_info("network logging stopped on interface %s as it %s\n", 71622ded577SJoe Perches dev->name, msg); 7178d8fc29dSAmerigo Wang } 71817951f34SSatyam Sharma 719b5427c27SSatyam Sharma done: 72017951f34SSatyam Sharma return NOTIFY_DONE; 72117951f34SSatyam Sharma } 72217951f34SSatyam Sharma 72317951f34SSatyam Sharma static struct notifier_block netconsole_netdev_notifier = { 72417951f34SSatyam Sharma .notifier_call = netconsole_netdev_event, 72517951f34SSatyam Sharma }; 72617951f34SSatyam Sharma 7271da177e4SLinus Torvalds static void write_msg(struct console *con, const char *msg, unsigned int len) 7281da177e4SLinus Torvalds { 7291da177e4SLinus Torvalds int frag, left; 7301da177e4SLinus Torvalds unsigned long flags; 731b5427c27SSatyam Sharma struct netconsole_target *nt; 732b5427c27SSatyam Sharma const char *tmp; 7331da177e4SLinus Torvalds 734c1a60851SAmerigo Wang if (oops_only && !oops_in_progress) 735c1a60851SAmerigo Wang return; 736b5427c27SSatyam Sharma /* Avoid taking lock and disabling interrupts unnecessarily */ 737b5427c27SSatyam Sharma if (list_empty(&target_list)) 738b5427c27SSatyam Sharma return; 739b5427c27SSatyam Sharma 740b5427c27SSatyam Sharma spin_lock_irqsave(&target_list_lock, flags); 741b5427c27SSatyam Sharma list_for_each_entry(nt, &target_list, list) { 7420bcc1816SSatyam Sharma netconsole_target_get(nt); 7430bcc1816SSatyam Sharma if (nt->enabled && netif_running(nt->np.dev)) { 744b5427c27SSatyam Sharma /* 745b5427c27SSatyam Sharma * We nest this inside the for-each-target loop above 746b5427c27SSatyam Sharma * so that we're able to get as much logging out to 747b5427c27SSatyam Sharma * at least one target if we die inside here, instead 748b5427c27SSatyam Sharma * of unnecessarily keeping all targets in lock-step. 749b5427c27SSatyam Sharma */ 750b5427c27SSatyam Sharma tmp = msg; 7511da177e4SLinus Torvalds for (left = len; left;) { 7521da177e4SLinus Torvalds frag = min(left, MAX_PRINT_CHUNK); 753b5427c27SSatyam Sharma netpoll_send_udp(&nt->np, tmp, frag); 754b5427c27SSatyam Sharma tmp += frag; 7551da177e4SLinus Torvalds left -= frag; 7561da177e4SLinus Torvalds } 7571da177e4SLinus Torvalds } 7580bcc1816SSatyam Sharma netconsole_target_put(nt); 7590cc120beSSatyam Sharma } 760b5427c27SSatyam Sharma spin_unlock_irqrestore(&target_list_lock, flags); 761b5427c27SSatyam Sharma } 7621da177e4SLinus Torvalds 7631da177e4SLinus Torvalds static struct console netconsole = { 764d938ab44SRandy Dunlap .name = "netcon", 7650517deedSMichael Ellerman .flags = CON_ENABLED, 766d39badf0SSatyam Sharma .write = write_msg, 7671da177e4SLinus Torvalds }; 7681da177e4SLinus Torvalds 769d39badf0SSatyam Sharma static int __init init_netconsole(void) 7701da177e4SLinus Torvalds { 7710bcc1816SSatyam Sharma int err; 772b5427c27SSatyam Sharma struct netconsole_target *nt, *tmp; 773b5427c27SSatyam Sharma unsigned long flags; 774b5427c27SSatyam Sharma char *target_config; 775b5427c27SSatyam Sharma char *input = config; 776b41848b6SStephen Hemminger 7770bcc1816SSatyam Sharma if (strnlen(input, MAX_PARAM_LENGTH)) { 778b5427c27SSatyam Sharma while ((target_config = strsep(&input, ";"))) { 7790bcc1816SSatyam Sharma nt = alloc_param_target(target_config); 780b5427c27SSatyam Sharma if (IS_ERR(nt)) { 781b5427c27SSatyam Sharma err = PTR_ERR(nt); 782b5427c27SSatyam Sharma goto fail; 783b5427c27SSatyam Sharma } 7840517deedSMichael Ellerman /* Dump existing printks when we register */ 7850517deedSMichael Ellerman netconsole.flags |= CON_PRINTBUFFER; 7860517deedSMichael Ellerman 787b5427c27SSatyam Sharma spin_lock_irqsave(&target_list_lock, flags); 788b5427c27SSatyam Sharma list_add(&nt->list, &target_list); 789b5427c27SSatyam Sharma spin_unlock_irqrestore(&target_list_lock, flags); 790b5427c27SSatyam Sharma } 7910bcc1816SSatyam Sharma } 7921da177e4SLinus Torvalds 79317951f34SSatyam Sharma err = register_netdevice_notifier(&netconsole_netdev_notifier); 79417951f34SSatyam Sharma if (err) 795b5427c27SSatyam Sharma goto fail; 79617951f34SSatyam Sharma 7970bcc1816SSatyam Sharma err = dynamic_netconsole_init(); 7980bcc1816SSatyam Sharma if (err) 7990bcc1816SSatyam Sharma goto undonotifier; 8000bcc1816SSatyam Sharma 8011da177e4SLinus Torvalds register_console(&netconsole); 80222ded577SJoe Perches pr_info("network logging started\n"); 803d39badf0SSatyam Sharma 804d39badf0SSatyam Sharma return err; 805b5427c27SSatyam Sharma 8060bcc1816SSatyam Sharma undonotifier: 8070bcc1816SSatyam Sharma unregister_netdevice_notifier(&netconsole_netdev_notifier); 8080bcc1816SSatyam Sharma 809b5427c27SSatyam Sharma fail: 81022ded577SJoe Perches pr_err("cleaning up\n"); 811b5427c27SSatyam Sharma 812b5427c27SSatyam Sharma /* 8130bcc1816SSatyam Sharma * Remove all targets and destroy them (only targets created 8140bcc1816SSatyam Sharma * from the boot/module option exist here). Skipping the list 815b5427c27SSatyam Sharma * lock is safe here, and netpoll_cleanup() will sleep. 816b5427c27SSatyam Sharma */ 817b5427c27SSatyam Sharma list_for_each_entry_safe(nt, tmp, &target_list, list) { 818b5427c27SSatyam Sharma list_del(&nt->list); 8190bcc1816SSatyam Sharma free_param_target(nt); 820b5427c27SSatyam Sharma } 821b5427c27SSatyam Sharma 822b5427c27SSatyam Sharma return err; 8231da177e4SLinus Torvalds } 8241da177e4SLinus Torvalds 825d39badf0SSatyam Sharma static void __exit cleanup_netconsole(void) 8261da177e4SLinus Torvalds { 827b5427c27SSatyam Sharma struct netconsole_target *nt, *tmp; 828df180e36SSatyam Sharma 8291da177e4SLinus Torvalds unregister_console(&netconsole); 8300bcc1816SSatyam Sharma dynamic_netconsole_exit(); 83117951f34SSatyam Sharma unregister_netdevice_notifier(&netconsole_netdev_notifier); 832b5427c27SSatyam Sharma 833b5427c27SSatyam Sharma /* 8340bcc1816SSatyam Sharma * Targets created via configfs pin references on our module 8350bcc1816SSatyam Sharma * and would first be rmdir(2)'ed from userspace. We reach 8360bcc1816SSatyam Sharma * here only when they are already destroyed, and only those 8370bcc1816SSatyam Sharma * created from the boot/module option are left, so remove and 8380bcc1816SSatyam Sharma * destroy them. Skipping the list lock is safe here, and 8390bcc1816SSatyam Sharma * netpoll_cleanup() will sleep. 840b5427c27SSatyam Sharma */ 841b5427c27SSatyam Sharma list_for_each_entry_safe(nt, tmp, &target_list, list) { 842b5427c27SSatyam Sharma list_del(&nt->list); 8430bcc1816SSatyam Sharma free_param_target(nt); 844b5427c27SSatyam Sharma } 8451da177e4SLinus Torvalds } 8461da177e4SLinus Torvalds 84797c7de05SLin Ming /* 84897c7de05SLin Ming * Use late_initcall to ensure netconsole is 84997c7de05SLin Ming * initialized after network device driver if built-in. 85097c7de05SLin Ming * 85197c7de05SLin Ming * late_initcall() and module_init() are identical if built as module. 85297c7de05SLin Ming */ 85397c7de05SLin Ming late_initcall(init_netconsole); 8541da177e4SLinus Torvalds module_exit(cleanup_netconsole); 855