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/*
* 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
*/
/****************************************************************
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
****************************************************************/
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/console.h>
#include <linux/moduleparam.h>
#include <linux/string.h>
#include <linux/netpoll.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]\n");
#ifndef MODULE
static int __init option_setup(char *opt)
{
strlcpy(config, opt, MAX_PARAM_LENGTH);
return 1;
}
__setup("netconsole=", option_setup);
#endif /* MODULE */
/**
* struct netconsole_target - Represents a configured netconsole target.
* @np: The netpoll structure for this target.
*/
struct netconsole_target {
struct netpoll np;
};
static struct netconsole_target default_target = {
.np = {
.name = "netconsole",
.dev_name = "eth0",
.local_port = 6665,
.remote_port = 6666,
.remote_mac = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff},
},
};
/* Handle network interface device notifications */
static int netconsole_netdev_event(struct notifier_block *this,
unsigned long event,
void *ptr)
{
struct net_device *dev = ptr;
struct netconsole_target *nt = &default_target;
if (nt->np.dev == dev) {
switch (event) {
case NETDEV_CHANGEADDR:
memcpy(nt->np.local_mac, dev->dev_addr, ETH_ALEN);
break;
case NETDEV_CHANGENAME:
strlcpy(nt->np.dev_name, dev->name, IFNAMSIZ);
break;
}
}
return NOTIFY_DONE;
}
static struct notifier_block netconsole_netdev_notifier = {
.notifier_call = netconsole_netdev_event,
};
static void write_msg(struct console *con, const char *msg, unsigned int len)
{
int frag, left;
unsigned long flags;
struct netconsole_target *nt = &default_target;
if (netif_running(nt->np.dev)) {
local_irq_save(flags);
for (left = len; left;) {
frag = min(left, MAX_PRINT_CHUNK);
netpoll_send_udp(&nt->np, msg, frag);
msg += frag;
left -= frag;
}
local_irq_restore(flags);
}
}
static struct console netconsole = {
.name = "netcon",
.flags = CON_ENABLED | CON_PRINTBUFFER,
.write = write_msg,
};
static int __init init_netconsole(void)
{
int err = 0;
struct netconsole_target *nt = &default_target;
if (!strnlen(config, MAX_PARAM_LENGTH)) {
printk(KERN_INFO "netconsole: not configured, aborting\n");
goto out;
}
err = netpoll_parse_options(&nt->np, config);
if (err)
goto out;
err = netpoll_setup(&nt->np);
if (err)
goto out;
err = register_netdevice_notifier(&netconsole_netdev_notifier);
if (err)
goto out;
register_console(&netconsole);
printk(KERN_INFO "netconsole: network logging started\n");
out:
return err;
}
static void __exit cleanup_netconsole(void)
{
struct netconsole_target *nt = &default_target;
unregister_console(&netconsole);
unregister_netdevice_notifier(&netconsole_netdev_notifier);
netpoll_cleanup(&nt->np);
}
module_init(init_netconsole);
module_exit(cleanup_netconsole);
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