// SPDX-License-Identifier: GPL-2.0-or-later/* * linux/drivers/net/netconsole.c * * Copyright (C) 2001 Ingo Molnar <mingo@redhat.com> * * This file contains the implementation of an IRQ-safe, crash-safe * kernel console implementation that outputs kernel messages to the * network. * * Modification history: * * 2001-09-17 started by Ingo Molnar. * 2003-08-11 2.6 port by Matt Mackall * simplified options * generic card hooks * works non-modular * 2003-09-07 rewritten with netpoll api */ /**************************************************************** * ****************************************************************/ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/mm.h>#include <linux/init.h>#include <linux/module.h>#include <linux/slab.h>#include <linux/console.h>#include <linux/moduleparam.h>#include <linux/kernel.h>#include <linux/string.h>#include <linux/netpoll.h>#include <linux/inet.h>#include <linux/configfs.h>#include <linux/etherdevice.h> MODULE_AUTHOR("Maintainer: Matt Mackall <mpm@selenic.com>");MODULE_DESCRIPTION("Console driver for network interfaces");MODULE_LICENSE("GPL"); #define MAX_PARAM_LENGTH 256#define MAX_PRINT_CHUNK 1000 static char config[MAX_PARAM_LENGTH];module_param_string(netconsole, config, MAX_PARAM_LENGTH, 0);MODULE_PARM_DESC(netconsole, " netconsole=[src-port]@[src-ip]/[dev],[tgt-port]@<tgt-ip>/[tgt-macaddr]"); static bool oops_only = false;module_param(oops_only, bool, 0600);MODULE_PARM_DESC(oops_only, "Only log oops messages"); #ifndef MODULEstatic int __init option_setup(char *opt){ strlcpy(config, opt, MAX_PARAM_LENGTH); return 1;}__setup("netconsole=", option_setup);#endif /* MODULE */ /* Linked list of all configured targets */static LIST_HEAD(target_list); /* This needs to be a spinlock because write_msg() cannot sleep */static DEFINE_SPINLOCK(target_list_lock); /* * Console driver for extended netconsoles. Registered on the first use to * avoid unnecessarily enabling ext message formatting. */static struct console netconsole_ext; /** * struct netconsole_target - Represents a configured netconsole target. * @list: Links this target into the target_list. * @item: Links us into the configfs subsystem hierarchy. * @enabled: On / off knob to enable / disable target. * Visible from userspace (read-write). * We maintain a strict 1:1 correspondence between this and * whether the corresponding netpoll is active or inactive. * Also, other parameters of a target may be modified at * runtime only when it is disabled (enabled == 0). * @extended: Denotes whether console is extended or not. * @np: The netpoll structure for this target. * Contains the other userspace visible parameters: * dev_name (read-write) * local_port (read-write) * remote_port (read-write) * local_ip (read-write) * remote_ip (read-write) * local_mac (read-only) * remote_mac (read-write) */struct netconsole_target { struct list_head list;#ifdef CONFIG_NETCONSOLE_DYNAMIC struct config_item item;#endif bool enabled; bool extended; struct netpoll np;}; #ifdef CONFIG_NETCONSOLE_DYNAMIC static struct configfs_subsystem netconsole_subsys;static DEFINE_MUTEX(dynamic_netconsole_mutex); static int __init dynamic_netconsole_init(void){ config_group_init(&netconsole_subsys.su_group); mutex_init(&netconsole_subsys.su_mutex); return configfs_register_subsystem(&netconsole_subsys);} static void __exit dynamic_netconsole_exit(void){ configfs_unregister_subsystem(&netconsole_subsys);} /* * Targets that were created by parsing the boot/module option string * do not exist in the configfs hierarchy (and have NULL names) and will * never go away, so make these a no-op for them. */static void netconsole_target_get(struct netconsole_target *nt){ if (config_item_name(&nt->item)) config_item_get(&nt->item);} static void netconsole_target_put(struct netconsole_target *nt){ if (config_item_name(&nt->item)) config_item_put(&nt->item);} #else /* !CONFIG_NETCONSOLE_DYNAMIC */ static int __init dynamic_netconsole_init(void){ return 0;} static void __exit dynamic_netconsole_exit(void){} /* * No danger of targets going away from under us when dynamic * reconfigurability is off. */static void netconsole_target_get(struct netconsole_target *nt){} static void netconsole_target_put(struct netconsole_target *nt){} #endif /* CONFIG_NETCONSOLE_DYNAMIC */ /* Allocate new target (from boot/module param) and setup netpoll for it */static struct netconsole_target *alloc_param_target(char *target_config){ int err = -ENOMEM; struct netconsole_target *nt; /* * Allocate and initialize with defaults. * Note that these targets get their config_item fields zeroed-out. */ nt = kzalloc(sizeof(*nt), GFP_KERNEL); if (!nt) goto fail; nt->np.name = "netconsole"; strlcpy(nt->np.dev_name, "eth0", IFNAMSIZ); nt->np.local_port = 6665; nt->np.remote_port = 6666; eth_broadcast_addr(nt->np.remote_mac); if (*target_config == '+') { nt->extended = true; target_config++; } /* Parse parameters and setup netpoll */ err = netpoll_parse_options(&nt->np, target_config); if (err) goto fail; err = netpoll_setup(&nt->np); if (err) goto fail; nt->enabled = true; return nt; fail: kfree(nt); return ERR_PTR(err);} /* Cleanup netpoll for given target (from boot/module param) and free it */static void free_param_target(struct netconsole_target *nt){ netpoll_cleanup(&nt->np); kfree(nt);} #ifdef CONFIG_NETCONSOLE_DYNAMIC /* * Our subsystem hierarchy is: * * /sys/kernel/config/netconsole/ * | * <target>/ * | enabled * | dev_name * | local_port * | remote_port * | local_ip * | remote_ip * | local_mac * | remote_mac * | * <target>/... */ static struct netconsole_target *to_target(struct config_item *item){ return item ? container_of(item, struct netconsole_target, item) : NULL;} /* * Attribute operations for netconsole_target. */ static ssize_t enabled_show(struct config_item *item, char *buf){ return snprintf(buf, PAGE_SIZE, "%d\n", to_target(item)->enabled);} static ssize_t extended_show(struct config_item *item, char *buf){ return snprintf(buf, PAGE_SIZE, "%d\n", to_target(item)->extended);} static ssize_t dev_name_show(struct config_item *item, char *buf){ return snprintf(buf, PAGE_SIZE, "%s\n", to_target(item)->np.dev_name);} static ssize_t local_port_show(struct config_item *item, char *buf){ return snprintf(buf, PAGE_SIZE, "%d\n", to_target(item)->np.local_port);} static ssize_t remote_port_show(struct config_item *item, char *buf){ return snprintf(buf, PAGE_SIZE, "%d\n", to_target(item)->np.remote_port);} static ssize_t local_ip_show(struct config_item *item, char *buf){ struct netconsole_target *nt = to_target(item); if (nt->np.ipv6) return snprintf(buf, PAGE_SIZE, "%pI6c\n", &nt->np.local_ip.in6); else return snprintf(buf, PAGE_SIZE, "%pI4\n", &nt->np.local_ip);} static ssize_t remote_ip_show(struct config_item *item, char *buf){ struct netconsole_target *nt = to_target(item); if (nt->np.ipv6) return snprintf(buf, PAGE_SIZE, "%pI6c\n", &nt->np.remote_ip.in6); else return snprintf(buf, PAGE_SIZE, "%pI4\n", &nt->np.remote_ip);} static ssize_t local_mac_show(struct config_item *item, char *buf){ struct net_device *dev = to_target(item)->np.dev; static const u8 bcast[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; return snprintf(buf, PAGE_SIZE, "%pM\n", dev ? dev->dev_addr : bcast);} static ssize_t remote_mac_show(struct config_item *item, char *buf){ return snprintf(buf, PAGE_SIZE, "%pM\n", to_target(item)->np.remote_mac);} /* * This one is special -- targets created through the configfs interface * are not enabled (and the corresponding netpoll activated) by default. * The user is expected to set the desired parameters first (which * would enable him to dynamically add new netpoll targets for new * network interfaces as and when they come up). */static ssize_t enabled_store(struct config_item *item, const char *buf, size_t count){ struct netconsole_target *nt = to_target(item); unsigned long flags; int enabled; int err; mutex_lock(&dynamic_netconsole_mutex); err = kstrtoint(buf, 10, &enabled); if (err < 0) goto out_unlock; err = -EINVAL; if (enabled < 0 || enabled > 1) goto out_unlock; if ((bool)enabled == nt->enabled) { pr_info("network logging has already %s\n", nt->enabled ? "started" : "stopped"); goto out_unlock; } if (enabled) { /* true */ if (nt->extended && !(netconsole_ext.flags & CON_ENABLED)) { netconsole_ext.flags |= CON_ENABLED; register_console(&netconsole_ext); } /* * Skip netpoll_parse_options() -- all the attributes are * already configured via configfs. Just print them out. */ netpoll_print_options(&nt->np); err = netpoll_setup(&nt->np); if (err) goto out_unlock; pr_info("network logging started\n"); } else { /* false */ /* We need to disable the netconsole before cleaning it up * otherwise we might end up in write_msg() with * nt->np.dev == NULL and nt->enabled == true */ spin_lock_irqsave(&target_list_lock, flags); nt->enabled = false; spin_unlock_irqrestore(&target_list_lock, flags); netpoll_cleanup(&nt->np); } nt->enabled = enabled; mutex_unlock(&dynamic_netconsole_mutex); return strnlen(buf, count);out_unlock: mutex_unlock(&dynamic_netconsole_mutex); return err;} static ssize_t extended_store(struct config_item *item, const char *buf, size_t count){ struct netconsole_target *nt = to_target(item); int extended; int err; mutex_lock(&dynamic_netconsole_mutex); if (nt->enabled) { pr_err("target (%s) is enabled, disable to update parameters\n", config_item_name(&nt->item)); err = -EINVAL; goto out_unlock; } err = kstrtoint(buf, 10, &extended); if (err < 0) goto out_unlock; if (extended < 0 || extended > 1) { err = -EINVAL; goto out_unlock; } nt->extended = extended; mutex_unlock(&dynamic_netconsole_mutex); return strnlen(buf, count);out_unlock: mutex_unlock(&dynamic_netconsole_mutex); return err;} static ssize_t dev_name_store(struct config_item *item, const char *buf, size_t count){ struct netconsole_target *nt = to_target(item); size_t len; mutex_lock(&dynamic_netconsole_mutex); if (nt->enabled) { pr_err("target (%s) is enabled, disable to update parameters\n", config_item_name(&nt->item)); mutex_unlock(&dynamic_netconsole_mutex); return -EINVAL; } strlcpy(nt->np.dev_name, buf, IFNAMSIZ); /* Get rid of possible trailing newline from echo(1) */ len = strnlen(nt->np.dev_name, IFNAMSIZ); if (nt->np.dev_name[len - 1] == '\n') nt->np.dev_name[len - 1] = '\0'; mutex_unlock(&dynamic_netconsole_mutex); return strnlen(buf, count);} static ssize_t local_port_store(struct config_item *item, const char *buf, size_t count){ struct netconsole_target *nt = to_target(item); int rv = -EINVAL; mutex_lock(&dynamic_netconsole_mutex); if (nt->enabled) { pr_err("target (%s) is enabled, disable to update parameters\n", config_item_name(&nt->item)); goto out_unlock; } rv = kstrtou16(buf, 10, &nt->np.local_port); if (rv < 0) goto out_unlock; mutex_unlock(&dynamic_netconsole_mutex); return strnlen(buf, count);out_unlock: mutex_unlock(&dynamic_netconsole_mutex); return rv;} static ssize_t remote_port_store(struct config_item *item, const char *buf, size_t count){ struct netconsole_target *nt = to_target(item); int rv = -EINVAL; mutex_lock(&dynamic_netconsole_mutex); if (nt->enabled) { pr_err("target (%s) is enabled, disable to update parameters\n", config_item_name(&nt->item)); goto out_unlock; } rv = kstrtou16(buf, 10, &nt->np.remote_port); if (rv < 0) goto out_unlock; mutex_unlock(&dynamic_netconsole_mutex); return strnlen(buf, count);out_unlock: mutex_unlock(&dynamic_netconsole_mutex); return rv;} static ssize_t local_ip_store(struct config_item *item, const char *buf, size_t count){ struct netconsole_target *nt = to_target(item); mutex_lock(&dynamic_netconsole_mutex); if (nt->enabled) { pr_err("target (%s) is enabled, disable to update parameters\n", config_item_name(&nt->item)); goto out_unlock; } if (strnchr(buf, count, ':')) { const char *end; if (in6_pton(buf, count, nt->np.local_ip.in6.s6_addr, -1, &end) > 0) { if (*end && *end != '\n') { pr_err("invalid IPv6 address at: <%c>\n", *end); goto out_unlock; } nt->np.ipv6 = true; } else goto out_unlock; } else { if (!nt->np.ipv6) { nt->np.local_ip.ip = in_aton(buf); } else goto out_unlock;Lines 1–500 of 974. 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// SPDX-License-Identifier: GPL-2.0-or-later /* * linux/drivers/net/netconsole.c * * Copyright (C) 2001 Ingo Molnar <mingo@redhat.com> * * This file contains the implementation of an IRQ-safe, crash-safe * kernel console implementation that outputs kernel messages to the * network. * * Modification history: * * 2001-09-17 started by Ingo Molnar. * 2003-08-11 2.6 port by Matt Mackall * simplified options * generic card hooks * works non-modular * 2003-09-07 rewritten with netpoll api */ /**************************************************************** * ****************************************************************/ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/mm.h> #include <linux/init.h> #include <linux/module.h> #include <linux/slab.h> #include <linux/console.h> #include <linux/moduleparam.h> #include <linux/kernel.h> #include <linux/string.h> #include <linux/netpoll.h> #include <linux/inet.h> #include <linux/configfs.h> #include <linux/etherdevice.h> MODULE_AUTHOR("Maintainer: Matt Mackall <mpm@selenic.com>"); MODULE_DESCRIPTION("Console driver for network interfaces"); MODULE_LICENSE("GPL"); #define MAX_PARAM_LENGTH 256 #define MAX_PRINT_CHUNK 1000 static char config[MAX_PARAM_LENGTH]; module_param_string(netconsole, config, MAX_PARAM_LENGTH, 0); MODULE_PARM_DESC(netconsole, " netconsole=[src-port]@[src-ip]/[dev],[tgt-port]@<tgt-ip>/[tgt-macaddr]"); static bool oops_only = false; module_param(oops_only, bool, 0600); MODULE_PARM_DESC(oops_only, "Only log oops messages"); #ifndef MODULE static int __init option_setup(char *opt) { strlcpy(config, opt, MAX_PARAM_LENGTH); return 1; } __setup("netconsole=", option_setup); #endif /* MODULE */ /* Linked list of all configured targets */ static LIST_HEAD(target_list); /* This needs to be a spinlock because write_msg() cannot sleep */ static DEFINE_SPINLOCK(target_list_lock); /* * Console driver for extended netconsoles. Registered on the first use to * avoid unnecessarily enabling ext message formatting. */ static struct console netconsole_ext; /** * struct netconsole_target - Represents a configured netconsole target. * @list: Links this target into the target_list. * @item: Links us into the configfs subsystem hierarchy. * @enabled: On / off knob to enable / disable target. * Visible from userspace (read-write). * We maintain a strict 1:1 correspondence between this and * whether the corresponding netpoll is active or inactive. * Also, other parameters of a target may be modified at * runtime only when it is disabled (enabled == 0). * @extended: Denotes whether console is extended or not. * @np: The netpoll structure for this target. * Contains the other userspace visible parameters: * dev_name (read-write) * local_port (read-write) * remote_port (read-write) * local_ip (read-write) * remote_ip (read-write) * local_mac (read-only) * remote_mac (read-write) */ struct netconsole_target { struct list_head list; #ifdef CONFIG_NETCONSOLE_DYNAMIC struct config_item item; #endif bool enabled; bool extended; struct netpoll np; }; #ifdef CONFIG_NETCONSOLE_DYNAMIC static struct configfs_subsystem netconsole_subsys; static DEFINE_MUTEX(dynamic_netconsole_mutex); static int __init dynamic_netconsole_init(void) { config_group_init(&netconsole_subsys.su_group); mutex_init(&netconsole_subsys.su_mutex); return configfs_register_subsystem(&netconsole_subsys); } static void __exit dynamic_netconsole_exit(void) { configfs_unregister_subsystem(&netconsole_subsys); } /* * Targets that were created by parsing the boot/module option string * do not exist in the configfs hierarchy (and have NULL names) and will * never go away, so make these a no-op for them. */ static void netconsole_target_get(struct netconsole_target *nt) { if (config_item_name(&nt->item)) config_item_get(&nt->item); } static void netconsole_target_put(struct netconsole_target *nt) { if (config_item_name(&nt->item)) config_item_put(&nt->item); } #else /* !CONFIG_NETCONSOLE_DYNAMIC */ static int __init dynamic_netconsole_init(void) { return 0; } static void __exit dynamic_netconsole_exit(void) { } /* * No danger of targets going away from under us when dynamic * reconfigurability is off. */ static void netconsole_target_get(struct netconsole_target *nt) { } static void netconsole_target_put(struct netconsole_target *nt) { } #endif /* CONFIG_NETCONSOLE_DYNAMIC */ /* Allocate new target (from boot/module param) and setup netpoll for it */ static struct netconsole_target *alloc_param_target(char *target_config) { int err = -ENOMEM; struct netconsole_target *nt; /* * Allocate and initialize with defaults. * Note that these targets get their config_item fields zeroed-out. */ nt = kzalloc(sizeof(*nt), GFP_KERNEL); if (!nt) goto fail; nt->np.name = "netconsole"; strlcpy(nt->np.dev_name, "eth0", IFNAMSIZ); nt->np.local_port = 6665; nt->np.remote_port = 6666; eth_broadcast_addr(nt->np.remote_mac); if (*target_config == '+') { nt->extended = true; target_config++; } /* Parse parameters and setup netpoll */ err = netpoll_parse_options(&nt->np, target_config); if (err) goto fail; err = netpoll_setup(&nt->np); if (err) goto fail; nt->enabled = true; return nt; fail: kfree(nt); return ERR_PTR(err); } /* Cleanup netpoll for given target (from boot/module param) and free it */ static void free_param_target(struct netconsole_target *nt) { netpoll_cleanup(&nt->np); kfree(nt); } #ifdef CONFIG_NETCONSOLE_DYNAMIC /* * Our subsystem hierarchy is: * * /sys/kernel/config/netconsole/ * | * <target>/ * | enabled * | dev_name * | local_port * | remote_port * | local_ip * | remote_ip * | local_mac * | remote_mac * | * <target>/... */ static struct netconsole_target *to_target(struct config_item *item) { return item ? container_of(item, struct netconsole_target, item) : NULL; } /* * Attribute operations for netconsole_target. */ static ssize_t enabled_show(struct config_item *item, char *buf) { return snprintf(buf, PAGE_SIZE, "%d\n", to_target(item)->enabled); } static ssize_t extended_show(struct config_item *item, char *buf) { return snprintf(buf, PAGE_SIZE, "%d\n", to_target(item)->extended); } static ssize_t dev_name_show(struct config_item *item, char *buf) { return snprintf(buf, PAGE_SIZE, "%s\n", to_target(item)->np.dev_name); } static ssize_t local_port_show(struct config_item *item, char *buf) { return snprintf(buf, PAGE_SIZE, "%d\n", to_target(item)->np.local_port); } static ssize_t remote_port_show(struct config_item *item, char *buf) { return snprintf(buf, PAGE_SIZE, "%d\n", to_target(item)->np.remote_port); } static ssize_t local_ip_show(struct config_item *item, char *buf) { struct netconsole_target *nt = to_target(item); if (nt->np.ipv6) return snprintf(buf, PAGE_SIZE, "%pI6c\n", &nt->np.local_ip.in6); else return snprintf(buf, PAGE_SIZE, "%pI4\n", &nt->np.local_ip); } static ssize_t remote_ip_show(struct config_item *item, char *buf) { struct netconsole_target *nt = to_target(item); if (nt->np.ipv6) return snprintf(buf, PAGE_SIZE, "%pI6c\n", &nt->np.remote_ip.in6); else return snprintf(buf, PAGE_SIZE, "%pI4\n", &nt->np.remote_ip); } static ssize_t local_mac_show(struct config_item *item, char *buf) { struct net_device *dev = to_target(item)->np.dev; static const u8 bcast[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; return snprintf(buf, PAGE_SIZE, "%pM\n", dev ? dev->dev_addr : bcast); } static ssize_t remote_mac_show(struct config_item *item, char *buf) { return snprintf(buf, PAGE_SIZE, "%pM\n", to_target(item)->np.remote_mac); } /* * This one is special -- targets created through the configfs interface * are not enabled (and the corresponding netpoll activated) by default. * The user is expected to set the desired parameters first (which * would enable him to dynamically add new netpoll targets for new * network interfaces as and when they come up). */ static ssize_t enabled_store(struct config_item *item, const char *buf, size_t count) { struct netconsole_target *nt = to_target(item); unsigned long flags; int enabled; int err; mutex_lock(&dynamic_netconsole_mutex); err = kstrtoint(buf, 10, &enabled); if (err < 0) goto out_unlock; err = -EINVAL; if (enabled < 0 || enabled > 1) goto out_unlock; if ((bool)enabled == nt->enabled) { pr_info("network logging has already %s\n", nt->enabled ? "started" : "stopped"); goto out_unlock; } if (enabled) { /* true */ if (nt->extended && !(netconsole_ext.flags & CON_ENABLED)) { netconsole_ext.flags |= CON_ENABLED; register_console(&netconsole_ext); } /* * Skip netpoll_parse_options() -- all the attributes are * already configured via configfs. Just print them out. */ netpoll_print_options(&nt->np); err = netpoll_setup(&nt->np); if (err) goto out_unlock; pr_info("network logging started\n"); } else { /* false */ /* We need to disable the netconsole before cleaning it up * otherwise we might end up in write_msg() with * nt->np.dev == NULL and nt->enabled == true */ spin_lock_irqsave(&target_list_lock, flags); nt->enabled = false; spin_unlock_irqrestore(&target_list_lock, flags); netpoll_cleanup(&nt->np); } nt->enabled = enabled; mutex_unlock(&dynamic_netconsole_mutex); return strnlen(buf, count); out_unlock: mutex_unlock(&dynamic_netconsole_mutex); return err; } static ssize_t extended_store(struct config_item *item, const char *buf, size_t count) { struct netconsole_target *nt = to_target(item); int extended; int err; mutex_lock(&dynamic_netconsole_mutex); if (nt->enabled) { pr_err("target (%s) is enabled, disable to update parameters\n", config_item_name(&nt->item)); err = -EINVAL; goto out_unlock; } err = kstrtoint(buf, 10, &extended); if (err < 0) goto out_unlock; if (extended < 0 || extended > 1) { err = -EINVAL; goto out_unlock; } nt->extended = extended; mutex_unlock(&dynamic_netconsole_mutex); return strnlen(buf, count); out_unlock: mutex_unlock(&dynamic_netconsole_mutex); return err; } static ssize_t dev_name_store(struct config_item *item, const char *buf, size_t count) { struct netconsole_target *nt = to_target(item); size_t len; mutex_lock(&dynamic_netconsole_mutex); if (nt->enabled) { pr_err("target (%s) is enabled, disable to update parameters\n", config_item_name(&nt->item)); mutex_unlock(&dynamic_netconsole_mutex); return -EINVAL; } strlcpy(nt->np.dev_name, buf, IFNAMSIZ); /* Get rid of possible trailing newline from echo(1) */ len = strnlen(nt->np.dev_name, IFNAMSIZ); if (nt->np.dev_name[len - 1] == '\n') nt->np.dev_name[len - 1] = '\0'; mutex_unlock(&dynamic_netconsole_mutex); return strnlen(buf, count); } static ssize_t local_port_store(struct config_item *item, const char *buf, size_t count) { struct netconsole_target *nt = to_target(item); int rv = -EINVAL; mutex_lock(&dynamic_netconsole_mutex); if (nt->enabled) { pr_err("target (%s) is enabled, disable to update parameters\n", config_item_name(&nt->item)); goto out_unlock; } rv = kstrtou16(buf, 10, &nt->np.local_port); if (rv < 0) goto out_unlock; mutex_unlock(&dynamic_netconsole_mutex); return strnlen(buf, count); out_unlock: mutex_unlock(&dynamic_netconsole_mutex); return rv; } static ssize_t remote_port_store(struct config_item *item, const char *buf, size_t count) { struct netconsole_target *nt = to_target(item); int rv = -EINVAL; mutex_lock(&dynamic_netconsole_mutex); if (nt->enabled) { pr_err("target (%s) is enabled, disable to update parameters\n", config_item_name(&nt->item)); goto out_unlock; } rv = kstrtou16(buf, 10, &nt->np.remote_port); if (rv < 0) goto out_unlock; mutex_unlock(&dynamic_netconsole_mutex); return strnlen(buf, count); out_unlock: mutex_unlock(&dynamic_netconsole_mutex); return rv; } static ssize_t local_ip_store(struct config_item *item, const char *buf, size_t count) { struct netconsole_target *nt = to_target(item); mutex_lock(&dynamic_netconsole_mutex); if (nt->enabled) { pr_err("target (%s) is enabled, disable to update parameters\n", config_item_name(&nt->item)); goto out_unlock; } if (strnchr(buf, count, ':')) { const char *end; if (in6_pton(buf, count, nt->np.local_ip.in6.s6_addr, -1, &end) > 0) { if (*end && *end != '\n') { pr_err("invalid IPv6 address at: <%c>\n", *end); goto out_unlock; } nt->np.ipv6 = true; } else goto out_unlock; } else { if (!nt->np.ipv6) { nt->np.local_ip.ip = in_aton(buf); } else goto out_unlock;