/* * linux/drivers/net/netconsole.c * * Copyright (C) 2001 Ingo Molnar * * 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 #include #include #include #include #include #include MODULE_AUTHOR("Maintainer: Matt Mackall "); 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-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}, }, }; 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; 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); netpoll_cleanup(&nt->np); } module_init(init_netconsole); module_exit(cleanup_netconsole);