/* * 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);