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fb3ceec187
Follow the advice of the below link and prefer 'strscpy' in this subsystem. Conversion is 1:1 because the return value is not used. Generated by a coccinelle script. Link: https://lore.kernel.org/r/CAHk-=wgfRnXz0W3D37d01q3JFkr_i_uTL=V6A6G1oUZcprmknw@mail.gmail.com/ Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Acked-by: Marc Kleine-Budde <mkl@pengutronix.de> # for CAN Link: https://lore.kernel.org/r/20220830201457.7984-1-wsa+renesas@sang-engineering.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
974 lines
24 KiB
C
974 lines
24 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* linux/drivers/net/netconsole.c
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*
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* Copyright (C) 2001 Ingo Molnar <mingo@redhat.com>
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*
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* This file contains the implementation of an IRQ-safe, crash-safe
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* kernel console implementation that outputs kernel messages to the
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* network.
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*
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* Modification history:
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*
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* 2001-09-17 started by Ingo Molnar.
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* 2003-08-11 2.6 port by Matt Mackall
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* simplified options
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* generic card hooks
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* works non-modular
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* 2003-09-07 rewritten with netpoll api
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*/
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/****************************************************************
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*
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****************************************************************/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/mm.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/console.h>
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#include <linux/moduleparam.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/netpoll.h>
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#include <linux/inet.h>
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#include <linux/configfs.h>
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#include <linux/etherdevice.h>
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MODULE_AUTHOR("Maintainer: Matt Mackall <mpm@selenic.com>");
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MODULE_DESCRIPTION("Console driver for network interfaces");
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MODULE_LICENSE("GPL");
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#define MAX_PARAM_LENGTH 256
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#define MAX_PRINT_CHUNK 1000
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static char config[MAX_PARAM_LENGTH];
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module_param_string(netconsole, config, MAX_PARAM_LENGTH, 0);
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MODULE_PARM_DESC(netconsole, " netconsole=[src-port]@[src-ip]/[dev],[tgt-port]@<tgt-ip>/[tgt-macaddr]");
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static bool oops_only = false;
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module_param(oops_only, bool, 0600);
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MODULE_PARM_DESC(oops_only, "Only log oops messages");
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#ifndef MODULE
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static int __init option_setup(char *opt)
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{
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strscpy(config, opt, MAX_PARAM_LENGTH);
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return 1;
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}
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__setup("netconsole=", option_setup);
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#endif /* MODULE */
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/* Linked list of all configured targets */
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static LIST_HEAD(target_list);
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/* This needs to be a spinlock because write_msg() cannot sleep */
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static DEFINE_SPINLOCK(target_list_lock);
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/*
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* Console driver for extended netconsoles. Registered on the first use to
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* avoid unnecessarily enabling ext message formatting.
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*/
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static struct console netconsole_ext;
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/**
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* struct netconsole_target - Represents a configured netconsole target.
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* @list: Links this target into the target_list.
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* @item: Links us into the configfs subsystem hierarchy.
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* @enabled: On / off knob to enable / disable target.
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* Visible from userspace (read-write).
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* We maintain a strict 1:1 correspondence between this and
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* whether the corresponding netpoll is active or inactive.
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* Also, other parameters of a target may be modified at
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* runtime only when it is disabled (enabled == 0).
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* @extended: Denotes whether console is extended or not.
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* @np: The netpoll structure for this target.
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* Contains the other userspace visible parameters:
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* dev_name (read-write)
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* local_port (read-write)
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* remote_port (read-write)
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* local_ip (read-write)
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* remote_ip (read-write)
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* local_mac (read-only)
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* remote_mac (read-write)
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*/
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struct netconsole_target {
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struct list_head list;
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#ifdef CONFIG_NETCONSOLE_DYNAMIC
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struct config_item item;
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#endif
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bool enabled;
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bool extended;
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struct netpoll np;
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};
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#ifdef CONFIG_NETCONSOLE_DYNAMIC
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static struct configfs_subsystem netconsole_subsys;
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static DEFINE_MUTEX(dynamic_netconsole_mutex);
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static int __init dynamic_netconsole_init(void)
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{
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config_group_init(&netconsole_subsys.su_group);
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mutex_init(&netconsole_subsys.su_mutex);
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return configfs_register_subsystem(&netconsole_subsys);
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}
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static void __exit dynamic_netconsole_exit(void)
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{
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configfs_unregister_subsystem(&netconsole_subsys);
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}
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/*
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* Targets that were created by parsing the boot/module option string
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* do not exist in the configfs hierarchy (and have NULL names) and will
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* never go away, so make these a no-op for them.
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*/
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static void netconsole_target_get(struct netconsole_target *nt)
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{
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if (config_item_name(&nt->item))
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config_item_get(&nt->item);
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}
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static void netconsole_target_put(struct netconsole_target *nt)
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{
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if (config_item_name(&nt->item))
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config_item_put(&nt->item);
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}
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#else /* !CONFIG_NETCONSOLE_DYNAMIC */
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static int __init dynamic_netconsole_init(void)
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{
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return 0;
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}
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static void __exit dynamic_netconsole_exit(void)
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{
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}
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/*
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* No danger of targets going away from under us when dynamic
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* reconfigurability is off.
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*/
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static void netconsole_target_get(struct netconsole_target *nt)
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{
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}
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static void netconsole_target_put(struct netconsole_target *nt)
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{
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}
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#endif /* CONFIG_NETCONSOLE_DYNAMIC */
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/* Allocate new target (from boot/module param) and setup netpoll for it */
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static struct netconsole_target *alloc_param_target(char *target_config)
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{
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int err = -ENOMEM;
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struct netconsole_target *nt;
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/*
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* Allocate and initialize with defaults.
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* Note that these targets get their config_item fields zeroed-out.
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*/
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nt = kzalloc(sizeof(*nt), GFP_KERNEL);
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if (!nt)
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goto fail;
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nt->np.name = "netconsole";
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strscpy(nt->np.dev_name, "eth0", IFNAMSIZ);
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nt->np.local_port = 6665;
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nt->np.remote_port = 6666;
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eth_broadcast_addr(nt->np.remote_mac);
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if (*target_config == '+') {
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nt->extended = true;
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target_config++;
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}
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/* Parse parameters and setup netpoll */
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err = netpoll_parse_options(&nt->np, target_config);
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if (err)
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goto fail;
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err = netpoll_setup(&nt->np);
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if (err)
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goto fail;
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nt->enabled = true;
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return nt;
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fail:
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kfree(nt);
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return ERR_PTR(err);
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}
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/* Cleanup netpoll for given target (from boot/module param) and free it */
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static void free_param_target(struct netconsole_target *nt)
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{
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netpoll_cleanup(&nt->np);
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kfree(nt);
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}
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#ifdef CONFIG_NETCONSOLE_DYNAMIC
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/*
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* Our subsystem hierarchy is:
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*
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* /sys/kernel/config/netconsole/
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* |
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* <target>/
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* | enabled
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* | dev_name
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* | local_port
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* | remote_port
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* | local_ip
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* | remote_ip
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* | local_mac
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* | remote_mac
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* |
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* <target>/...
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*/
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static struct netconsole_target *to_target(struct config_item *item)
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{
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return item ?
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container_of(item, struct netconsole_target, item) :
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NULL;
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}
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/*
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* Attribute operations for netconsole_target.
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*/
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static ssize_t enabled_show(struct config_item *item, char *buf)
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{
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return snprintf(buf, PAGE_SIZE, "%d\n", to_target(item)->enabled);
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}
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static ssize_t extended_show(struct config_item *item, char *buf)
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{
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return snprintf(buf, PAGE_SIZE, "%d\n", to_target(item)->extended);
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}
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static ssize_t dev_name_show(struct config_item *item, char *buf)
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{
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return snprintf(buf, PAGE_SIZE, "%s\n", to_target(item)->np.dev_name);
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}
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static ssize_t local_port_show(struct config_item *item, char *buf)
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{
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return snprintf(buf, PAGE_SIZE, "%d\n", to_target(item)->np.local_port);
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}
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static ssize_t remote_port_show(struct config_item *item, char *buf)
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{
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return snprintf(buf, PAGE_SIZE, "%d\n", to_target(item)->np.remote_port);
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}
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static ssize_t local_ip_show(struct config_item *item, char *buf)
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{
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struct netconsole_target *nt = to_target(item);
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if (nt->np.ipv6)
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return snprintf(buf, PAGE_SIZE, "%pI6c\n", &nt->np.local_ip.in6);
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else
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return snprintf(buf, PAGE_SIZE, "%pI4\n", &nt->np.local_ip);
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}
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static ssize_t remote_ip_show(struct config_item *item, char *buf)
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{
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struct netconsole_target *nt = to_target(item);
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if (nt->np.ipv6)
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return snprintf(buf, PAGE_SIZE, "%pI6c\n", &nt->np.remote_ip.in6);
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else
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return snprintf(buf, PAGE_SIZE, "%pI4\n", &nt->np.remote_ip);
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}
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static ssize_t local_mac_show(struct config_item *item, char *buf)
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{
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struct net_device *dev = to_target(item)->np.dev;
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static const u8 bcast[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
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return snprintf(buf, PAGE_SIZE, "%pM\n", dev ? dev->dev_addr : bcast);
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}
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static ssize_t remote_mac_show(struct config_item *item, char *buf)
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{
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return snprintf(buf, PAGE_SIZE, "%pM\n", to_target(item)->np.remote_mac);
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}
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/*
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* This one is special -- targets created through the configfs interface
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* are not enabled (and the corresponding netpoll activated) by default.
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* The user is expected to set the desired parameters first (which
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* would enable him to dynamically add new netpoll targets for new
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* network interfaces as and when they come up).
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*/
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static ssize_t enabled_store(struct config_item *item,
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const char *buf, size_t count)
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{
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struct netconsole_target *nt = to_target(item);
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unsigned long flags;
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int enabled;
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int err;
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mutex_lock(&dynamic_netconsole_mutex);
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err = kstrtoint(buf, 10, &enabled);
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if (err < 0)
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goto out_unlock;
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err = -EINVAL;
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if (enabled < 0 || enabled > 1)
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goto out_unlock;
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if ((bool)enabled == nt->enabled) {
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pr_info("network logging has already %s\n",
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nt->enabled ? "started" : "stopped");
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goto out_unlock;
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}
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if (enabled) { /* true */
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if (nt->extended && !(netconsole_ext.flags & CON_ENABLED)) {
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netconsole_ext.flags |= CON_ENABLED;
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register_console(&netconsole_ext);
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}
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/*
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* Skip netpoll_parse_options() -- all the attributes are
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* already configured via configfs. Just print them out.
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*/
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netpoll_print_options(&nt->np);
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err = netpoll_setup(&nt->np);
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if (err)
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goto out_unlock;
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pr_info("network logging started\n");
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} else { /* false */
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/* We need to disable the netconsole before cleaning it up
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* otherwise we might end up in write_msg() with
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* nt->np.dev == NULL and nt->enabled == true
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*/
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spin_lock_irqsave(&target_list_lock, flags);
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nt->enabled = false;
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spin_unlock_irqrestore(&target_list_lock, flags);
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netpoll_cleanup(&nt->np);
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}
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nt->enabled = enabled;
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|
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mutex_unlock(&dynamic_netconsole_mutex);
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return strnlen(buf, count);
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out_unlock:
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mutex_unlock(&dynamic_netconsole_mutex);
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return err;
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}
|
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|
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static ssize_t extended_store(struct config_item *item, const char *buf,
|
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size_t count)
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{
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struct netconsole_target *nt = to_target(item);
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int extended;
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int err;
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|
|
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mutex_lock(&dynamic_netconsole_mutex);
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if (nt->enabled) {
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pr_err("target (%s) is enabled, disable to update parameters\n",
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config_item_name(&nt->item));
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err = -EINVAL;
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goto out_unlock;
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}
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|
|
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err = kstrtoint(buf, 10, &extended);
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|
if (err < 0)
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goto out_unlock;
|
|
if (extended < 0 || extended > 1) {
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err = -EINVAL;
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goto out_unlock;
|
|
}
|
|
|
|
nt->extended = extended;
|
|
|
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mutex_unlock(&dynamic_netconsole_mutex);
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return strnlen(buf, count);
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|
out_unlock:
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mutex_unlock(&dynamic_netconsole_mutex);
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return err;
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}
|
|
|
|
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;
|
|
|
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mutex_lock(&dynamic_netconsole_mutex);
|
|
if (nt->enabled) {
|
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pr_err("target (%s) is enabled, disable to update parameters\n",
|
|
config_item_name(&nt->item));
|
|
mutex_unlock(&dynamic_netconsole_mutex);
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|
return -EINVAL;
|
|
}
|
|
|
|
strscpy(nt->np.dev_name, buf, IFNAMSIZ);
|
|
|
|
/* Get rid of possible trailing newline from echo(1) */
|
|
len = strnlen(nt->np.dev_name, IFNAMSIZ);
|
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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;
|
|
}
|
|
|
|
mutex_unlock(&dynamic_netconsole_mutex);
|
|
return strnlen(buf, count);
|
|
out_unlock:
|
|
mutex_unlock(&dynamic_netconsole_mutex);
|
|
return -EINVAL;
|
|
}
|
|
|
|
static ssize_t remote_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.remote_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.remote_ip.ip = in_aton(buf);
|
|
} else
|
|
goto out_unlock;
|
|
}
|
|
|
|
mutex_unlock(&dynamic_netconsole_mutex);
|
|
return strnlen(buf, count);
|
|
out_unlock:
|
|
mutex_unlock(&dynamic_netconsole_mutex);
|
|
return -EINVAL;
|
|
}
|
|
|
|
static ssize_t remote_mac_store(struct config_item *item, const char *buf,
|
|
size_t count)
|
|
{
|
|
struct netconsole_target *nt = to_target(item);
|
|
u8 remote_mac[ETH_ALEN];
|
|
|
|
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 (!mac_pton(buf, remote_mac))
|
|
goto out_unlock;
|
|
if (buf[3 * ETH_ALEN - 1] && buf[3 * ETH_ALEN - 1] != '\n')
|
|
goto out_unlock;
|
|
memcpy(nt->np.remote_mac, remote_mac, ETH_ALEN);
|
|
|
|
mutex_unlock(&dynamic_netconsole_mutex);
|
|
return strnlen(buf, count);
|
|
out_unlock:
|
|
mutex_unlock(&dynamic_netconsole_mutex);
|
|
return -EINVAL;
|
|
}
|
|
|
|
CONFIGFS_ATTR(, enabled);
|
|
CONFIGFS_ATTR(, extended);
|
|
CONFIGFS_ATTR(, dev_name);
|
|
CONFIGFS_ATTR(, local_port);
|
|
CONFIGFS_ATTR(, remote_port);
|
|
CONFIGFS_ATTR(, local_ip);
|
|
CONFIGFS_ATTR(, remote_ip);
|
|
CONFIGFS_ATTR_RO(, local_mac);
|
|
CONFIGFS_ATTR(, remote_mac);
|
|
|
|
static struct configfs_attribute *netconsole_target_attrs[] = {
|
|
&attr_enabled,
|
|
&attr_extended,
|
|
&attr_dev_name,
|
|
&attr_local_port,
|
|
&attr_remote_port,
|
|
&attr_local_ip,
|
|
&attr_remote_ip,
|
|
&attr_local_mac,
|
|
&attr_remote_mac,
|
|
NULL,
|
|
};
|
|
|
|
/*
|
|
* Item operations and type for netconsole_target.
|
|
*/
|
|
|
|
static void netconsole_target_release(struct config_item *item)
|
|
{
|
|
kfree(to_target(item));
|
|
}
|
|
|
|
static struct configfs_item_operations netconsole_target_item_ops = {
|
|
.release = netconsole_target_release,
|
|
};
|
|
|
|
static const struct config_item_type netconsole_target_type = {
|
|
.ct_attrs = netconsole_target_attrs,
|
|
.ct_item_ops = &netconsole_target_item_ops,
|
|
.ct_owner = THIS_MODULE,
|
|
};
|
|
|
|
/*
|
|
* Group operations and type for netconsole_subsys.
|
|
*/
|
|
|
|
static struct config_item *make_netconsole_target(struct config_group *group,
|
|
const char *name)
|
|
{
|
|
unsigned long flags;
|
|
struct netconsole_target *nt;
|
|
|
|
/*
|
|
* Allocate and initialize with defaults.
|
|
* Target is disabled at creation (!enabled).
|
|
*/
|
|
nt = kzalloc(sizeof(*nt), GFP_KERNEL);
|
|
if (!nt)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
nt->np.name = "netconsole";
|
|
strscpy(nt->np.dev_name, "eth0", IFNAMSIZ);
|
|
nt->np.local_port = 6665;
|
|
nt->np.remote_port = 6666;
|
|
eth_broadcast_addr(nt->np.remote_mac);
|
|
|
|
/* Initialize the config_item member */
|
|
config_item_init_type_name(&nt->item, name, &netconsole_target_type);
|
|
|
|
/* Adding, but it is disabled */
|
|
spin_lock_irqsave(&target_list_lock, flags);
|
|
list_add(&nt->list, &target_list);
|
|
spin_unlock_irqrestore(&target_list_lock, flags);
|
|
|
|
return &nt->item;
|
|
}
|
|
|
|
static void drop_netconsole_target(struct config_group *group,
|
|
struct config_item *item)
|
|
{
|
|
unsigned long flags;
|
|
struct netconsole_target *nt = to_target(item);
|
|
|
|
spin_lock_irqsave(&target_list_lock, flags);
|
|
list_del(&nt->list);
|
|
spin_unlock_irqrestore(&target_list_lock, flags);
|
|
|
|
/*
|
|
* The target may have never been enabled, or was manually disabled
|
|
* before being removed so netpoll may have already been cleaned up.
|
|
*/
|
|
if (nt->enabled)
|
|
netpoll_cleanup(&nt->np);
|
|
|
|
config_item_put(&nt->item);
|
|
}
|
|
|
|
static struct configfs_group_operations netconsole_subsys_group_ops = {
|
|
.make_item = make_netconsole_target,
|
|
.drop_item = drop_netconsole_target,
|
|
};
|
|
|
|
static const struct config_item_type netconsole_subsys_type = {
|
|
.ct_group_ops = &netconsole_subsys_group_ops,
|
|
.ct_owner = THIS_MODULE,
|
|
};
|
|
|
|
/* The netconsole configfs subsystem */
|
|
static struct configfs_subsystem netconsole_subsys = {
|
|
.su_group = {
|
|
.cg_item = {
|
|
.ci_namebuf = "netconsole",
|
|
.ci_type = &netconsole_subsys_type,
|
|
},
|
|
},
|
|
};
|
|
|
|
#endif /* CONFIG_NETCONSOLE_DYNAMIC */
|
|
|
|
/* Handle network interface device notifications */
|
|
static int netconsole_netdev_event(struct notifier_block *this,
|
|
unsigned long event, void *ptr)
|
|
{
|
|
unsigned long flags;
|
|
struct netconsole_target *nt;
|
|
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
|
|
bool stopped = false;
|
|
|
|
if (!(event == NETDEV_CHANGENAME || event == NETDEV_UNREGISTER ||
|
|
event == NETDEV_RELEASE || event == NETDEV_JOIN))
|
|
goto done;
|
|
|
|
spin_lock_irqsave(&target_list_lock, flags);
|
|
restart:
|
|
list_for_each_entry(nt, &target_list, list) {
|
|
netconsole_target_get(nt);
|
|
if (nt->np.dev == dev) {
|
|
switch (event) {
|
|
case NETDEV_CHANGENAME:
|
|
strscpy(nt->np.dev_name, dev->name, IFNAMSIZ);
|
|
break;
|
|
case NETDEV_RELEASE:
|
|
case NETDEV_JOIN:
|
|
case NETDEV_UNREGISTER:
|
|
/* rtnl_lock already held
|
|
* we might sleep in __netpoll_cleanup()
|
|
*/
|
|
spin_unlock_irqrestore(&target_list_lock, flags);
|
|
|
|
__netpoll_cleanup(&nt->np);
|
|
|
|
spin_lock_irqsave(&target_list_lock, flags);
|
|
netdev_put(nt->np.dev, &nt->np.dev_tracker);
|
|
nt->np.dev = NULL;
|
|
nt->enabled = false;
|
|
stopped = true;
|
|
netconsole_target_put(nt);
|
|
goto restart;
|
|
}
|
|
}
|
|
netconsole_target_put(nt);
|
|
}
|
|
spin_unlock_irqrestore(&target_list_lock, flags);
|
|
if (stopped) {
|
|
const char *msg = "had an event";
|
|
switch (event) {
|
|
case NETDEV_UNREGISTER:
|
|
msg = "unregistered";
|
|
break;
|
|
case NETDEV_RELEASE:
|
|
msg = "released slaves";
|
|
break;
|
|
case NETDEV_JOIN:
|
|
msg = "is joining a master device";
|
|
break;
|
|
}
|
|
pr_info("network logging stopped on interface %s as it %s\n",
|
|
dev->name, msg);
|
|
}
|
|
|
|
done:
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block netconsole_netdev_notifier = {
|
|
.notifier_call = netconsole_netdev_event,
|
|
};
|
|
|
|
/**
|
|
* send_ext_msg_udp - send extended log message to target
|
|
* @nt: target to send message to
|
|
* @msg: extended log message to send
|
|
* @msg_len: length of message
|
|
*
|
|
* Transfer extended log @msg to @nt. If @msg is longer than
|
|
* MAX_PRINT_CHUNK, it'll be split and transmitted in multiple chunks with
|
|
* ncfrag header field added to identify them.
|
|
*/
|
|
static void send_ext_msg_udp(struct netconsole_target *nt, const char *msg,
|
|
int msg_len)
|
|
{
|
|
static char buf[MAX_PRINT_CHUNK]; /* protected by target_list_lock */
|
|
const char *header, *body;
|
|
int offset = 0;
|
|
int header_len, body_len;
|
|
|
|
if (msg_len <= MAX_PRINT_CHUNK) {
|
|
netpoll_send_udp(&nt->np, msg, msg_len);
|
|
return;
|
|
}
|
|
|
|
/* need to insert extra header fields, detect header and body */
|
|
header = msg;
|
|
body = memchr(msg, ';', msg_len);
|
|
if (WARN_ON_ONCE(!body))
|
|
return;
|
|
|
|
header_len = body - header;
|
|
body_len = msg_len - header_len - 1;
|
|
body++;
|
|
|
|
/*
|
|
* Transfer multiple chunks with the following extra header.
|
|
* "ncfrag=<byte-offset>/<total-bytes>"
|
|
*/
|
|
memcpy(buf, header, header_len);
|
|
|
|
while (offset < body_len) {
|
|
int this_header = header_len;
|
|
int this_chunk;
|
|
|
|
this_header += scnprintf(buf + this_header,
|
|
sizeof(buf) - this_header,
|
|
",ncfrag=%d/%d;", offset, body_len);
|
|
|
|
this_chunk = min(body_len - offset,
|
|
MAX_PRINT_CHUNK - this_header);
|
|
if (WARN_ON_ONCE(this_chunk <= 0))
|
|
return;
|
|
|
|
memcpy(buf + this_header, body + offset, this_chunk);
|
|
|
|
netpoll_send_udp(&nt->np, buf, this_header + this_chunk);
|
|
|
|
offset += this_chunk;
|
|
}
|
|
}
|
|
|
|
static void write_ext_msg(struct console *con, const char *msg,
|
|
unsigned int len)
|
|
{
|
|
struct netconsole_target *nt;
|
|
unsigned long flags;
|
|
|
|
if ((oops_only && !oops_in_progress) || list_empty(&target_list))
|
|
return;
|
|
|
|
spin_lock_irqsave(&target_list_lock, flags);
|
|
list_for_each_entry(nt, &target_list, list)
|
|
if (nt->extended && nt->enabled && netif_running(nt->np.dev))
|
|
send_ext_msg_udp(nt, msg, len);
|
|
spin_unlock_irqrestore(&target_list_lock, flags);
|
|
}
|
|
|
|
static void write_msg(struct console *con, const char *msg, unsigned int len)
|
|
{
|
|
int frag, left;
|
|
unsigned long flags;
|
|
struct netconsole_target *nt;
|
|
const char *tmp;
|
|
|
|
if (oops_only && !oops_in_progress)
|
|
return;
|
|
/* Avoid taking lock and disabling interrupts unnecessarily */
|
|
if (list_empty(&target_list))
|
|
return;
|
|
|
|
spin_lock_irqsave(&target_list_lock, flags);
|
|
list_for_each_entry(nt, &target_list, list) {
|
|
if (!nt->extended && nt->enabled && netif_running(nt->np.dev)) {
|
|
/*
|
|
* We nest this inside the for-each-target loop above
|
|
* so that we're able to get as much logging out to
|
|
* at least one target if we die inside here, instead
|
|
* of unnecessarily keeping all targets in lock-step.
|
|
*/
|
|
tmp = msg;
|
|
for (left = len; left;) {
|
|
frag = min(left, MAX_PRINT_CHUNK);
|
|
netpoll_send_udp(&nt->np, tmp, frag);
|
|
tmp += frag;
|
|
left -= frag;
|
|
}
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&target_list_lock, flags);
|
|
}
|
|
|
|
static struct console netconsole_ext = {
|
|
.name = "netcon_ext",
|
|
.flags = CON_EXTENDED, /* starts disabled, registered on first use */
|
|
.write = write_ext_msg,
|
|
};
|
|
|
|
static struct console netconsole = {
|
|
.name = "netcon",
|
|
.flags = CON_ENABLED,
|
|
.write = write_msg,
|
|
};
|
|
|
|
static int __init init_netconsole(void)
|
|
{
|
|
int err;
|
|
struct netconsole_target *nt, *tmp;
|
|
unsigned long flags;
|
|
char *target_config;
|
|
char *input = config;
|
|
|
|
if (strnlen(input, MAX_PARAM_LENGTH)) {
|
|
while ((target_config = strsep(&input, ";"))) {
|
|
nt = alloc_param_target(target_config);
|
|
if (IS_ERR(nt)) {
|
|
err = PTR_ERR(nt);
|
|
goto fail;
|
|
}
|
|
/* Dump existing printks when we register */
|
|
if (nt->extended)
|
|
netconsole_ext.flags |= CON_PRINTBUFFER |
|
|
CON_ENABLED;
|
|
else
|
|
netconsole.flags |= CON_PRINTBUFFER;
|
|
|
|
spin_lock_irqsave(&target_list_lock, flags);
|
|
list_add(&nt->list, &target_list);
|
|
spin_unlock_irqrestore(&target_list_lock, flags);
|
|
}
|
|
}
|
|
|
|
err = register_netdevice_notifier(&netconsole_netdev_notifier);
|
|
if (err)
|
|
goto fail;
|
|
|
|
err = dynamic_netconsole_init();
|
|
if (err)
|
|
goto undonotifier;
|
|
|
|
if (netconsole_ext.flags & CON_ENABLED)
|
|
register_console(&netconsole_ext);
|
|
register_console(&netconsole);
|
|
pr_info("network logging started\n");
|
|
|
|
return err;
|
|
|
|
undonotifier:
|
|
unregister_netdevice_notifier(&netconsole_netdev_notifier);
|
|
|
|
fail:
|
|
pr_err("cleaning up\n");
|
|
|
|
/*
|
|
* Remove all targets and destroy them (only targets created
|
|
* from the boot/module option exist here). Skipping the list
|
|
* lock is safe here, and netpoll_cleanup() will sleep.
|
|
*/
|
|
list_for_each_entry_safe(nt, tmp, &target_list, list) {
|
|
list_del(&nt->list);
|
|
free_param_target(nt);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static void __exit cleanup_netconsole(void)
|
|
{
|
|
struct netconsole_target *nt, *tmp;
|
|
|
|
unregister_console(&netconsole_ext);
|
|
unregister_console(&netconsole);
|
|
dynamic_netconsole_exit();
|
|
unregister_netdevice_notifier(&netconsole_netdev_notifier);
|
|
|
|
/*
|
|
* Targets created via configfs pin references on our module
|
|
* and would first be rmdir(2)'ed from userspace. We reach
|
|
* here only when they are already destroyed, and only those
|
|
* created from the boot/module option are left, so remove and
|
|
* destroy them. Skipping the list lock is safe here, and
|
|
* netpoll_cleanup() will sleep.
|
|
*/
|
|
list_for_each_entry_safe(nt, tmp, &target_list, list) {
|
|
list_del(&nt->list);
|
|
free_param_target(nt);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Use late_initcall to ensure netconsole is
|
|
* initialized after network device driver if built-in.
|
|
*
|
|
* late_initcall() and module_init() are identical if built as module.
|
|
*/
|
|
late_initcall(init_netconsole);
|
|
module_exit(cleanup_netconsole);
|