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/*
* netifd - network interface daemon
* Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation
*
* 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.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <libubox/uloop.h>
#include "netifd.h"
#include "interface.h"
#include "ubus.h"
char *hotplug_cmd_path = DEFAULT_HOTPLUG_PATH;
static struct interface *current;
static enum interface_event current_ev;
static struct list_head pending = LIST_HEAD_INIT(pending);
static void task_complete(struct uloop_process *proc, int ret);
static struct uloop_process task = {
.cb = task_complete,
};
static const char * const eventnames[] = {"ifdown", "ifup", "ifupdate"};
static void
run_cmd(const char *ifname, const char *device, enum interface_event event,
enum interface_update_flags updated)
{
char *argv[3];
int pid;
pid = fork();
if (pid < 0)
return task_complete(NULL, -1);
if (pid > 0) {
task.pid = pid;
uloop_process_add(&task);
return;
}
setenv("ACTION", eventnames[event], 1);
setenv("INTERFACE", ifname, 1);
if (device)
setenv("DEVICE", device, 1);
if (event == IFEV_UPDATE) {
if (updated & IUF_ADDRESS)
setenv("IFUPDATE_ADDRESSES", "1", 1);
if (updated & IUF_ROUTE)
setenv("IFUPDATE_ROUTES", "1", 1);
if (updated & IUF_PREFIX)
setenv("IFUPDATE_PREFIXES", "1", 1);
if (updated & IUF_DATA)
setenv("IFUPDATE_DATA", "1", 1);
}
argv[0] = hotplug_cmd_path;
argv[1] = "iface";
argv[2] = NULL;
execvp(argv[0], argv);
exit(127);
}
static void
call_hotplug(void)
{
const char *device = NULL;
if (list_empty(&pending))
return;
current = list_first_entry(&pending, struct interface, hotplug_list);
current_ev = current->hotplug_ev;
list_del_init(¤t->hotplug_list);
if ((current_ev == IFEV_UP || current_ev == IFEV_UPDATE) && current->l3_dev.dev)
device = current->l3_dev.dev->ifname;
D(SYSTEM, "Call hotplug handler for interface '%s', event '%s' (%s)\n",
current->name, eventnames[current_ev], device ? device : "none");
run_cmd(current->name, device, current_ev, current->updated);
}
static void
task_complete(struct uloop_process *proc, int ret)
{
if (current)
D(SYSTEM, "Complete hotplug handler for interface '%s'\n", current->name);
current = NULL;
call_hotplug();
}
/*
* Queue an interface for an up/down event.
* An interface can only have one event in the queue and one
* event waiting for completion.
* When queueing an event that is the same as the one waiting for
* completion, remove the interface from the queue
*/
static void
interface_queue_event(struct interface *iface, enum interface_event ev)
{
D(SYSTEM, "Queue hotplug handler for interface '%s', event '%s'\n",
iface->name, eventnames[ev]);
if (ev == IFEV_UP || ev == IFEV_DOWN)
netifd_ubus_interface_event(iface, ev == IFEV_UP);
netifd_ubus_interface_notify(iface, ev != IFEV_DOWN);
if (current == iface) {
/* an event for iface is being processed */
if (!list_empty(&iface->hotplug_list)) {
/* an additional event for iface is pending */
if ((ev != current_ev || ev == IFEV_UPDATE) &&
!(iface->hotplug_ev == IFEV_UP && ev == IFEV_UPDATE)) {
/* if incoming event is different from the one
* being handled or if it is an update,
* overwrite pending event, but never
* overwrite an ifup with an ifupdate */
iface->hotplug_ev = ev;
}
else if (ev == current_ev && ev != IFEV_UPDATE) {
/* if incoming event is not an ifupdate
* and is the same as the one that is
* being handled, remove it from the
* pending list */
list_del_init(&iface->hotplug_list);
}
}
else {
/* no additional event for iface is pending */
if (ev != current_ev || ev == IFEV_UPDATE) {
/* only add the interface to the pending list if
* the event is different from the one being
* handled or if it is an update */
iface->hotplug_ev = ev;
/* Handle hotplug calls FIFO */
list_add_tail(&iface->hotplug_list, &pending);
}
}
}
else {
/* currently not handling an event or handling an event
* for another interface */
if (!list_empty(&iface->hotplug_list)) {
/* an event for iface is pending */
if (!(iface->hotplug_ev == IFEV_UP &&
ev == IFEV_UPDATE)) {
/* overwrite pending event, unless the incoming
* event is an ifupdate while the pending one
* is an ifup */
iface->hotplug_ev = ev;
}
}
else {
/* an event for the interface is not yet pending,
* queue it */
iface->hotplug_ev = ev;
/* Handle hotplug calls FIFO */
list_add_tail(&iface->hotplug_list, &pending);
}
}
if (!task.pending && !current)
call_hotplug();
}
static void
interface_dequeue_event(struct interface *iface)
{
if (iface == current)
current = NULL;
if (!list_empty(&iface->hotplug_list))
list_del_init(&iface->hotplug_list);
}
static void interface_event_cb(struct interface_user *dep, struct interface *iface,
enum interface_event ev)
{
switch (ev) {
case IFEV_UP:
case IFEV_UPDATE:
case IFEV_DOWN:
interface_queue_event(iface, ev);
break;
case IFEV_FREE:
case IFEV_RELOAD:
interface_dequeue_event(iface);
break;
}
}
static struct interface_user event_user = {
.cb = interface_event_cb
};
static void __init interface_event_init(void)
{
interface_add_user(&event_user, NULL);
}
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