265 lines
6.7 KiB
C
265 lines
6.7 KiB
C
/*
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* linux/drivers/net/netconsole.c
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*
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* Copyright (C) 2001 Ingo Molnar <mingo@redhat.com>
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*
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* This file contains the implementation of an IRQ-safe, crash-safe
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* kernel console implementation that outputs kernel messages to the
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* network.
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*
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* Modification history:
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*
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* 2001-09-17 started by Ingo Molnar.
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* 2003-08-11 2.6 port by Matt Mackall
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* simplified options
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* generic card hooks
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* works non-modular
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* 2003-09-07 rewritten with netpoll api
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*/
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/****************************************************************
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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****************************************************************/
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#include <linux/mm.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/console.h>
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#include <linux/moduleparam.h>
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#include <linux/string.h>
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#include <linux/netpoll.h>
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MODULE_AUTHOR("Maintainer: Matt Mackall <mpm@selenic.com>");
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MODULE_DESCRIPTION("Console driver for network interfaces");
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MODULE_LICENSE("GPL");
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#define MAX_PARAM_LENGTH 256
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#define MAX_PRINT_CHUNK 1000
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static char config[MAX_PARAM_LENGTH];
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module_param_string(netconsole, config, MAX_PARAM_LENGTH, 0);
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MODULE_PARM_DESC(netconsole, " netconsole=[src-port]@[src-ip]/[dev],[tgt-port]@<tgt-ip>/[tgt-macaddr]\n");
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#ifndef MODULE
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static int __init option_setup(char *opt)
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{
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strlcpy(config, opt, MAX_PARAM_LENGTH);
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return 1;
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}
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__setup("netconsole=", option_setup);
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#endif /* MODULE */
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/* Linked list of all configured targets */
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static LIST_HEAD(target_list);
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/* This needs to be a spinlock because write_msg() cannot sleep */
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static DEFINE_SPINLOCK(target_list_lock);
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/**
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* struct netconsole_target - Represents a configured netconsole target.
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* @list: Links this target into the target_list.
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* @np: The netpoll structure for this target.
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*/
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struct netconsole_target {
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struct list_head list;
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struct netpoll np;
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};
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/* Allocate new target and setup netpoll for it */
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static struct netconsole_target *alloc_target(char *target_config)
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{
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int err = -ENOMEM;
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struct netconsole_target *nt;
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/* Allocate and initialize with defaults */
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nt = kzalloc(sizeof(*nt), GFP_KERNEL);
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if (!nt) {
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printk(KERN_ERR "netconsole: failed to allocate memory\n");
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goto fail;
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}
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nt->np.name = "netconsole";
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strlcpy(nt->np.dev_name, "eth0", IFNAMSIZ);
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nt->np.local_port = 6665;
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nt->np.remote_port = 6666;
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memset(nt->np.remote_mac, 0xff, ETH_ALEN);
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/* Parse parameters and setup netpoll */
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err = netpoll_parse_options(&nt->np, target_config);
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if (err)
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goto fail;
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err = netpoll_setup(&nt->np);
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if (err)
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goto fail;
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return nt;
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fail:
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kfree(nt);
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return ERR_PTR(err);
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}
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/* Cleanup netpoll for given target and free it */
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static void free_target(struct netconsole_target *nt)
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{
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netpoll_cleanup(&nt->np);
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kfree(nt);
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}
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/* Handle network interface device notifications */
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static int netconsole_netdev_event(struct notifier_block *this,
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unsigned long event,
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void *ptr)
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{
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unsigned long flags;
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struct netconsole_target *nt;
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struct net_device *dev = ptr;
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if (!(event == NETDEV_CHANGEADDR || event == NETDEV_CHANGENAME))
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goto done;
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spin_lock_irqsave(&target_list_lock, flags);
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list_for_each_entry(nt, &target_list, list) {
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if (nt->np.dev == dev) {
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switch (event) {
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case NETDEV_CHANGEADDR:
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memcpy(nt->np.local_mac, dev->dev_addr, ETH_ALEN);
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break;
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case NETDEV_CHANGENAME:
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strlcpy(nt->np.dev_name, dev->name, IFNAMSIZ);
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break;
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}
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}
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}
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spin_unlock_irqrestore(&target_list_lock, flags);
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done:
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return NOTIFY_DONE;
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}
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static struct notifier_block netconsole_netdev_notifier = {
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.notifier_call = netconsole_netdev_event,
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};
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static void write_msg(struct console *con, const char *msg, unsigned int len)
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{
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int frag, left;
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unsigned long flags;
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struct netconsole_target *nt;
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const char *tmp;
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/* Avoid taking lock and disabling interrupts unnecessarily */
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if (list_empty(&target_list))
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return;
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spin_lock_irqsave(&target_list_lock, flags);
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list_for_each_entry(nt, &target_list, list) {
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if (netif_running(nt->np.dev)) {
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/*
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* We nest this inside the for-each-target loop above
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* so that we're able to get as much logging out to
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* at least one target if we die inside here, instead
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* of unnecessarily keeping all targets in lock-step.
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*/
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tmp = msg;
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for (left = len; left;) {
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frag = min(left, MAX_PRINT_CHUNK);
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netpoll_send_udp(&nt->np, tmp, frag);
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tmp += frag;
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left -= frag;
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}
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}
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}
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spin_unlock_irqrestore(&target_list_lock, flags);
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}
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static struct console netconsole = {
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.name = "netcon",
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.flags = CON_ENABLED | CON_PRINTBUFFER,
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.write = write_msg,
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};
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static int __init init_netconsole(void)
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{
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int err = 0;
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struct netconsole_target *nt, *tmp;
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unsigned long flags;
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char *target_config;
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char *input = config;
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if (!strnlen(input, MAX_PARAM_LENGTH)) {
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printk(KERN_INFO "netconsole: not configured, aborting\n");
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goto out;
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}
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while ((target_config = strsep(&input, ";"))) {
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nt = alloc_target(target_config);
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if (IS_ERR(nt)) {
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err = PTR_ERR(nt);
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goto fail;
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}
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spin_lock_irqsave(&target_list_lock, flags);
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list_add(&nt->list, &target_list);
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spin_unlock_irqrestore(&target_list_lock, flags);
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}
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err = register_netdevice_notifier(&netconsole_netdev_notifier);
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if (err)
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goto fail;
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register_console(&netconsole);
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printk(KERN_INFO "netconsole: network logging started\n");
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out:
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return err;
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fail:
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printk(KERN_ERR "netconsole: cleaning up\n");
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/*
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* Remove all targets and destroy them. Skipping the list
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* lock is safe here, and netpoll_cleanup() will sleep.
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*/
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list_for_each_entry_safe(nt, tmp, &target_list, list) {
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list_del(&nt->list);
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free_target(nt);
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}
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return err;
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}
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static void __exit cleanup_netconsole(void)
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{
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struct netconsole_target *nt, *tmp;
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unregister_console(&netconsole);
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unregister_netdevice_notifier(&netconsole_netdev_notifier);
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/*
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* Remove all targets and destroy them. Skipping the list
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* lock is safe here, and netpoll_cleanup() will sleep.
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*/
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list_for_each_entry_safe(nt, tmp, &target_list, list) {
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list_del(&nt->list);
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free_target(nt);
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}
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}
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module_init(init_netconsole);
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module_exit(cleanup_netconsole);
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