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/*
* ClickOS
*
* file: click.cc
*
* NEC Europe Ltd. PROPRIETARY INFORMATION
*
* This software is supplied under the terms of a license agreement
* or nondisclosure agreement with NEC Europe Ltd. and may not be
* copied or disclosed except in accordance with the terms of that
* agreement. The software and its source code contain valuable trade
* secrets and confidential information which have to be maintained in
* confidence.
* Any unauthorized publication, transfer to third parties or duplication
* of the object or source code - either totally or in part – is
* prohibited.
*
* Copyright (c) 2014 NEC Europe Ltd. All Rights Reserved.
*
* Authors: Joao Martins <joao.martins@neclab.eu>
* Filipe Manco <filipe.manco@neclab.eu>
*
* NEC Europe Ltd. DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED,
* INCLUDING BUT NOT LIMITED TO IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE AND THE WARRANTY AGAINST LATENT
* DEFECTS, WITH RESPECT TO THE PROGRAM AND THE ACCOMPANYING
* DOCUMENTATION.
*
* No Liability For Consequential Damages IN NO EVENT SHALL NEC Europe
* Ltd., NEC Corporation OR ANY OF ITS SUBSIDIARIES BE LIABLE FOR ANY
* DAMAGES WHATSOEVER (INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS
* OF BUSINESS PROFITS, BUSINESS INTERRUPTION, LOSS OF INFORMATION, OR
* OTHER PECUNIARY LOSS AND INDIRECT, CONSEQUENTIAL, INCIDENTAL,
* ECONOMIC OR PUNITIVE DAMAGES) ARISING OUT OF THE USE OF OR INABILITY
* TO USE THIS PROGRAM, EVEN IF NEC Europe Ltd. HAS BEEN ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*
* THIS HEADER MAY NOT BE EXTRACTED OR MODIFIED IN ANY WAY.
*/
#include <click/config.h>
#include <click/lexer.hh>
#include <click/router.hh>
#include <click/master.hh>
#include <click/error.hh>
#include <click/timer.hh>
#include <click/string.hh>
#include <click/straccum.hh>
#include <click/driver.hh>
extern "C"{
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <mini-os/xenbus.h>
#include <mini-os/shutdown.h>
#include <mini-os/sched.h>
}
void *__dso_handle = NULL;
#define NLOG(fmt, ...)
#define LOG(fmt, ...) \
printf("[%s:%d] " fmt "\n", \
__FUNCTION__, __LINE__, ##__VA_ARGS__)
/**
* xenstore helpers
*/
#define PATH_ROOT "clickos"
#define PATH_MAX_LEN 1024
struct xenstore_dev {
domid_t dom;
char *nodename;
xenbus_event_queue events;
} *xsdev = NULL;
uint32_t domid = -1;
u_int _shutdown = 0;
u_int _reason = 0;
char*
event_token(char **key)
{
char *p = *key, *p2;
char *token;
u_int sz;
p2 = strchr(++p, '/');
sz = (p2 != NULL ? p2 - p : strlen(p));
token = strndup(p, sz);
*key = (p+sz);
return token;
}
char*
read_rid(char *path)
{
char *id = strdup(path + 1);
char *id_end = strchr(id, '/');
*id_end = '\0';
return id;
}
String *
read_config(u_int rid = 0)
{
char path[PATH_MAX_LEN];
String *cfg = new String();
char *token;
for (int i = 0;; i++) {
snprintf(path, PATH_MAX_LEN, "%s/%d/config/%d",
PATH_ROOT, rid, i);
xenbus_read(XBT_NIL, path, &token);
if (token == NULL)
break;
*cfg += token;
}
return cfg;
}
/*
* click glue
*/
#define MAX_ROUTERS 64
static ErrorHandler *errh;
static Master master(1);
struct router_instance {
Router *r;
u_int f_stop;
} router_list[MAX_ROUTERS];
void
router_thread(void *thread_data)
{
u_int *rid = (u_int*) thread_data;
String *config = read_config(*rid);
struct router_instance *ri = &router_list[*rid];
ri->r = click_read_router(*config, true, errh, false, &master);
if (ri->r->initialize(errh) < 0) {
LOG("Router init failed!");
ri->f_stop = 1;
return;
}
ri->r->use();
ri->r->activate(errh);
LOG("Starting driver...\n\n");
ri->r->master()->thread(0)->driver();
LOG("Stopping driver...\n\n");
ri->r->unuse();
ri->f_stop = 1;
LOG("Master/driver stopped, closing router_thread");
free(config);
free(rid);
}
void
router_stop(int n = MAX_ROUTERS)
{
LOG("Stopping all routers...\n\n");
for (int i = n - 1; i >= 0; --i) {
Router *r = router_list[i].r;
if (router_list[i].f_stop)
continue;
LOG("Stopping instance = %d...\n\n", i);
do {
r->please_stop_driver();
schedule();
} while (!(router_list[i].f_stop));
}
LOG("Stopped all routers...\n\n");
}
void
router_suspend(int n = MAX_ROUTERS)
{
}
void
router_resume(int n = MAX_ROUTERS)
{
}
u_int
on_status(int rid, char *key, void *data)
{
String status = (char *) data;
struct router_instance *r = &router_list[rid];
LOG("router id %d", rid);
LOG("status change to %s", data);
if (status == "Running") {
u_int *arg0;
if (!r->f_stop)
goto status_err;
arg0 = (u_int*) malloc(sizeof(u_int));
*arg0 = rid;
r->f_stop = 0;
create_thread((char*)"click", router_thread, arg0);
} else if (status == "Halted") {
if (r->f_stop)
goto status_err;
router_stop(rid);
}
return 0;
status_err:
return -EINVAL;
}
static void
read_cname(char *path, Element **e, const Handler **h, int rid)
{
int sep = strchr(path, '/') - path;
String ename(path, sep), hname(path + sep + 1);
Router *r = router_list[rid].r;
NLOG("sep=%d element=%s handler=%s", sep,
ename.c_str(), hname.c_str());
*e = r->find(ename);
*h = Router::handler(*e, hname);
NLOG("ename %s=%p hname %s=%p", ename.c_str(), e, hname.c_str(), h);
}
u_int
on_elem_readh(int rid, char *key, void *data)
{
Element *e;
const Handler* h;
String val, h_path, lock_path;
int f_stop = router_list[rid].f_stop;
if (strncmp(key, "/read/", 6))
return 0;
if (f_stop)
return 0;
read_cname(key+6, &e, &h, rid);
if (!h || !h->readable())
return EINVAL;
val = h->call_read(e, "", ErrorHandler::default_handler());
h_path = String(PATH_ROOT) + "/0/elements/" + e->name() + "/" + h->name();
lock_path = h_path + "/lock";
xenbus_write(XBT_NIL, h_path.c_str(), val.c_str());
xenbus_write(XBT_NIL, lock_path.c_str(), "0");
NLOG("element handler read %s", val.c_str());
return 0;
}
u_int
on_elem_writeh(int rid, char *key, void *data)
{
Element *e;
const Handler* h;
int f_stop = router_list[rid].f_stop;
if (f_stop || strlen((char *) data) == 0)
return 0;
read_cname(key+1, &e, &h, rid);
if (!h || !h->writable())
return EINVAL;
h->call_write(String(data), e, ErrorHandler::default_handler());
NLOG("element handler write %s value %s", data, "");
return 0;
}
u_int
on_router(char *key, void *data)
{
char *p = key;
String rev;
u_int rid;
if (strlen(key) == 0)
return 0;
rid = atoi(event_token(&p));
rev = event_token(&p);
if (rev == "control")
on_elem_readh(rid, p, data);
else if (rev == "elements")
on_elem_writeh(rid, p, data);
else if (rev == "status")
on_status(rid, key, data);
return 0;
}
/* runs the event loop */
int main(int argc, char **argv)
{
size_t len = sizeof(struct xenstore_dev);
click_static_initialize();
errh = ErrorHandler::default_handler();
xsdev = (struct xenstore_dev*) malloc(len);
memset(xsdev, 0, len);
memset(router_list, 0, MAX_ROUTERS * sizeof(struct router_instance));
for (int i = 0; i < MAX_ROUTERS; ++i) {
router_list[i].f_stop = 1;
}
xenbus_watch_path_token(XBT_NIL, PATH_ROOT, "router-watch",
&xsdev->events);
while (!_shutdown) {
String value;
char *err, *val, **path;
path = xenbus_wait_for_watch_return(&xsdev->events);
if (!path || _shutdown)
continue;
err = xenbus_read(XBT_NIL, *path, &val);
if (err)
continue;
on_router((*path + strlen(PATH_ROOT)), val);
}
LOG("Shutting down...");
xenbus_unwatch_path_token(XBT_NIL, PATH_ROOT, "router-watch");
fini_xenbus();
free(xsdev);
return _reason;
}
/* app shutdown hook from minios */
extern "C" {
int app_shutdown(unsigned reason)
{
switch (reason) {
case SHUTDOWN_poweroff:
LOG("Requested shutdown reason=poweroff");
_shutdown = 1;
_reason = reason;
router_stop();
xenbus_release_wait_for_watch(&xsdev->events);
break;
case SHUTDOWN_reboot:
LOG("Requested shutdown reason=reboot");
_shutdown = 1;
_reason = reason;
router_stop();
xenbus_release_wait_for_watch(&xsdev->events);
break;
case SHUTDOWN_suspend:
LOG("Requested shutdown reason=suspend");
router_suspend();
kernel_suspend();
router_resume();
default:
LOG("Requested shutdown with invalid reason (%d)", reason);
break;
}
return 0;
}
}