/* *  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/tty.h>#include <linux/init.h>#include <linux/module.h>#include <linux/console.h>#include <linux/tty_driver.h>#include <linux/moduleparam.h>#include <linux/string.h>#include <linux/sysrq.h>#include <linux/smp.h>#include <linux/netpoll.h> MODULE_AUTHOR("Maintainer: Matt Mackall <mpm@selenic.com>");MODULE_DESCRIPTION("Console driver for network interfaces");MODULE_LICENSE("GPL"); static char config[256];module_param_string(netconsole, config, 256, 0);MODULE_PARM_DESC(netconsole, " netconsole=[src-port]@[src-ip]/[dev],[tgt-port]@<tgt-ip>/[tgt-macaddr]\n"); static struct netpoll np = {	.name = "netconsole",	.dev_name = "eth0",	.local_port = 6665,	.remote_port = 6666,	.remote_mac = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff},};static int configured = 0; #define MAX_PRINT_CHUNK 1000 static void write_msg(struct console *con, const char *msg, unsigned int len){	int frag, left;	unsigned long flags; 	if (!np.dev)		return; 	local_irq_save(flags); 	for(left = len; left; ) {		frag = min(left, MAX_PRINT_CHUNK);		netpoll_send_udp(&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 option_setup(char *opt){	configured = !netpoll_parse_options(&np, opt);	return 1;} __setup("netconsole=", option_setup); static int init_netconsole(void){	int err; 	if(strlen(config))		option_setup(config); 	if(!configured) {		printk("netconsole: not configured, aborting\n");		return 0;	} 	err = netpoll_setup(&np);	if (err)		return err; 	register_console(&netconsole);	printk(KERN_INFO "netconsole: network logging started\n");	return 0;} static void cleanup_netconsole(void){	unregister_console(&netconsole);	netpoll_cleanup(&np);} module_init(init_netconsole);module_exit(cleanup_netconsole);