1 /* 2 * linux/drivers/net/netconsole.c 3 * 4 * Copyright (C) 2001 Ingo Molnar <mingo@redhat.com> 5 * 6 * This file contains the implementation of an IRQ-safe, crash-safe 7 * kernel console implementation that outputs kernel messages to the 8 * network. 9 * 10 * Modification history: 11 * 12 * 2001-09-17 started by Ingo Molnar. 13 * 2003-08-11 2.6 port by Matt Mackall 14 * simplified options 15 * generic card hooks 16 * works non-modular 17 * 2003-09-07 rewritten with netpoll api 18 */ 19 20 /**************************************************************** 21 * This program is free software; you can redistribute it and/or modify 22 * it under the terms of the GNU General Public License as published by 23 * the Free Software Foundation; either version 2, or (at your option) 24 * any later version. 25 * 26 * This program is distributed in the hope that it will be useful, 27 * but WITHOUT ANY WARRANTY; without even the implied warranty of 28 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 29 * GNU General Public License for more details. 30 * 31 * You should have received a copy of the GNU General Public License 32 * along with this program; if not, write to the Free Software 33 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 34 * 35 ****************************************************************/ 36 37 #include <linux/mm.h> 38 #include <linux/tty.h> 39 #include <linux/init.h> 40 #include <linux/module.h> 41 #include <linux/console.h> 42 #include <linux/tty_driver.h> 43 #include <linux/moduleparam.h> 44 #include <linux/string.h> 45 #include <linux/sysrq.h> 46 #include <linux/smp.h> 47 #include <linux/netpoll.h> 48 49 MODULE_AUTHOR("Maintainer: Matt Mackall <mpm@selenic.com>"); 50 MODULE_DESCRIPTION("Console driver for network interfaces"); 51 MODULE_LICENSE("GPL"); 52 53 static char config[256]; 54 module_param_string(netconsole, config, 256, 0); 55 MODULE_PARM_DESC(netconsole, " netconsole=[src-port]@[src-ip]/[dev],[tgt-port]@<tgt-ip>/[tgt-macaddr]\n"); 56 57 static struct netpoll np = { 58 .name = "netconsole", 59 .dev_name = "eth0", 60 .local_port = 6665, 61 .remote_port = 6666, 62 .remote_mac = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}, 63 .drop = netpoll_queue, 64 }; 65 static int configured = 0; 66 67 #define MAX_PRINT_CHUNK 1000 68 69 static void write_msg(struct console *con, const char *msg, unsigned int len) 70 { 71 int frag, left; 72 unsigned long flags; 73 74 if (!np.dev) 75 return; 76 77 local_irq_save(flags); 78 79 for(left = len; left; ) { 80 frag = min(left, MAX_PRINT_CHUNK); 81 netpoll_send_udp(&np, msg, frag); 82 msg += frag; 83 left -= frag; 84 } 85 86 local_irq_restore(flags); 87 } 88 89 static struct console netconsole = { 90 .name = "netcon", 91 .flags = CON_ENABLED | CON_PRINTBUFFER, 92 .write = write_msg 93 }; 94 95 static int option_setup(char *opt) 96 { 97 configured = !netpoll_parse_options(&np, opt); 98 return 1; 99 } 100 101 __setup("netconsole=", option_setup); 102 103 static int init_netconsole(void) 104 { 105 if(strlen(config)) 106 option_setup(config); 107 108 if(!configured) { 109 printk("netconsole: not configured, aborting\n"); 110 return 0; 111 } 112 113 if(netpoll_setup(&np)) 114 return -EINVAL; 115 116 register_console(&netconsole); 117 printk(KERN_INFO "netconsole: network logging started\n"); 118 return 0; 119 } 120 121 static void cleanup_netconsole(void) 122 { 123 unregister_console(&netconsole); 124 netpoll_cleanup(&np); 125 } 126 127 module_init(init_netconsole); 128 module_exit(cleanup_netconsole); 129