![Satyam Sharma](/assets/img/avatar_default.png)
Based upon initial work by Keiichi Kii <k-keiichi@bx.jp.nec.com>. To update fields of underlying netpoll structure at runtime on corresponding NETDEV_CHANGEADDR or NETDEV_CHANGENAME notifications. ioctl(SIOCSIFHWADDR or SIOCSIFNAME) could be used to change the hardware/MAC address or name of the local interface that our netpoll is attached to. Whenever this happens, netdev notifier chain is called out with the NETDEV_CHANGEADDR or NETDEV_CHANGENAME event message. We respond to that and update the local_mac or dev_name field of the struct netpoll. This makes sense anyway, but is especially required for dynamic netconsole because the netpoll structure's internal members become user visible files when either sysfs or configfs are used. So this helps us to keep up with the MAC address/name changes and keep values in struct netpoll uptodate. [ Note that ioctl(SIOCSIFADDR) to change IP address of interface at runtime is not handled (to update local_ip of netpoll) on purpose -- some setups may set the local_ip to a private address, not necessary the actual IP address of the sender host, as presently allowed. ] Signed-off-by: Satyam Sharma <satyam@infradead.org> Signed-off-by: Keiichi Kii <k-keiichi@bx.jp.nec.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: David S. Miller <davem@davemloft.net>
174 lines
4.4 KiB
C
174 lines
4.4 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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/**
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* struct netconsole_target - Represents a configured netconsole target.
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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 netpoll np;
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};
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static struct netconsole_target default_target = {
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.np = {
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.name = "netconsole",
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.dev_name = "eth0",
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.local_port = 6665,
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.remote_port = 6666,
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.remote_mac = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff},
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},
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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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struct net_device *dev = ptr;
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struct netconsole_target *nt = &default_target;
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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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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 = &default_target;
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if (netif_running(nt->np.dev)) {
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local_irq_save(flags);
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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, msg, frag);
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msg += frag;
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left -= frag;
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}
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local_irq_restore(flags);
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}
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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 = &default_target;
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if (!strnlen(config, 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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err = netpoll_parse_options(&nt->np, config);
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if (err)
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goto out;
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err = netpoll_setup(&nt->np);
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if (err)
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goto out;
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err = register_netdevice_notifier(&netconsole_netdev_notifier);
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if (err)
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goto out;
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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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}
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static void __exit cleanup_netconsole(void)
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{
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struct netconsole_target *nt = &default_target;
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unregister_console(&netconsole);
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unregister_netdevice_notifier(&netconsole_netdev_notifier);
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netpoll_cleanup(&nt->np);
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}
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module_init(init_netconsole);
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module_exit(cleanup_netconsole);
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