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/*
* Ouroboros - Copyright (C) 2016 - 2017
*
* Policy for flat addresses in a distributed way
*
* Sander Vrijders <sander.vrijders@intec.ugent.be>
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#define OUROBOROS_PREFIX "flat-addr-auth"
#include <ouroboros/config.h>
#include <ouroboros/logs.h>
#include <ouroboros/errno.h>
#include <ouroboros/time_utils.h>
#include "shm_pci.h"
#include "ribmgr.h"
#include "ro.h"
#include "pathname.h"
#include <time.h>
#include <stdlib.h>
#include <math.h>
#include <string.h>
#include <assert.h>
#define POL_RO_ROOT "flat_addr"
#define TIMEOUT 100 /* ms */
#define STR_SIZE 100
#define FLAT_ADDR_REQ 0
#define FLAT_ADDR_REPLY 1
struct flat_addr_msg {
uint8_t code;
uint64_t addr;
};
struct {
int sid;
uint64_t addr;
bool addr_in_use;
pthread_cond_t cond;
pthread_mutex_t lock;
} flat;
static char * addr_name(void)
{
char * name;
/* uint64_t as a string has 25 chars */
char addr_name[30];
sprintf(addr_name, "%lu", (unsigned long) flat.addr);
name = pathname_create(POL_RO_ROOT);
if (name == NULL)
return NULL;
name = pathname_append(name, addr_name);
return name;
}
static void ro_created(const char * name,
uint8_t * data,
size_t len)
{
struct flat_addr_msg * msg;
assert(name);
assert(data);
assert(len >= sizeof(*msg));
msg = (struct flat_addr_msg *) data;
if (msg->code == FLAT_ADDR_REQ && msg->addr == flat.addr) {
msg->code = FLAT_ADDR_REPLY;
ro_write(name, data, len);
}
}
static void ro_updated(const char * name,
uint8_t * data,
size_t len)
{
struct flat_addr_msg * msg;
char * ro_name;
assert(name);
assert(data);
assert(len >= sizeof(*msg));
(void) len;
ro_name = addr_name();
if (ro_name == NULL) {
free(data);
return;
}
msg = (struct flat_addr_msg *) data;
if (msg->code == FLAT_ADDR_REPLY &&
strcmp(name, ro_name) == 0) {
pthread_mutex_lock(&flat.lock);
flat.addr_in_use = true;
pthread_cond_broadcast(&flat.cond);
pthread_mutex_unlock(&flat.lock);
}
free(data);
free(ro_name);
}
static struct ro_sub_ops flat_sub_ops = {
.ro_created = ro_created,
.ro_updated = ro_updated,
.ro_deleted = NULL
};
int flat_init(void)
{
struct ro_attr rattr;
pthread_condattr_t cattr;
struct timespec t;
char * name;
clock_gettime(CLOCK_REALTIME, &t);
srand(t.tv_nsec);
flat.addr_in_use = false;
ro_attr_init(&rattr);
pthread_mutex_init(&flat.lock, NULL);
pthread_condattr_init(&cattr);
#ifndef __APPLE__
pthread_condattr_setclock(&cattr, PTHREAD_COND_CLOCK);
#endif
pthread_cond_init(&flat.cond, &cattr);
flat.sid = ro_subscribe(POL_RO_ROOT, &flat_sub_ops);
if (flat.sid < 0) {
LOG_ERR("Could not subscribe to RIB.");
pthread_cond_destroy(&flat.cond);
pthread_mutex_destroy(&flat.lock);
return -1;
}
name = pathname_create(POL_RO_ROOT);
if (name == NULL) {
pthread_cond_destroy(&flat.cond);
pthread_mutex_destroy(&flat.lock);
ro_unsubscribe(flat.sid);
return -1;
}
if (!ro_exists(name)) {
rattr.enrol_sync = true;
if (ro_create(name, &rattr, NULL, 0)) {
LOG_ERR("Could not create RO.");
pathname_destroy(name);
pthread_cond_destroy(&flat.cond);
pthread_mutex_destroy(&flat.lock);
ro_unsubscribe(flat.sid);
return -1;
}
}
pathname_destroy(name);
return 0;
}
int flat_fini(void)
{
pthread_cond_destroy(&flat.cond);
pthread_mutex_destroy(&flat.lock);
ro_unsubscribe(flat.sid);
return 0;
}
uint64_t flat_address(void)
{
int ret = 0;
uint64_t max_addr;
struct dt_const * dtc;
struct timespec timeout = {(TIMEOUT / 1000),
(TIMEOUT % 1000) * MILLION};
struct timespec abstime;
struct ro_attr attr;
struct flat_addr_msg * msg;
uint8_t * buf;
char * ro_name;
dtc = ribmgr_dt_const();
if (dtc == NULL)
return INVALID_ADDR;
if (dtc->addr_size == 8) {
LOG_ERR("Policy cannot be used with 64 bit addresses.");
return INVALID_ADDR;
}
while (ret != -ETIMEDOUT) {
clock_gettime(PTHREAD_COND_CLOCK, &abstime);
ts_add(&abstime, &timeout, &abstime);
max_addr = (1 << (8 * dtc->addr_size)) - 1;
flat.addr = (rand() % (max_addr - 1)) + 1;
ro_attr_init(&attr);
attr.recv_set = ALL_MEMBERS;
attr.expiry.tv_sec = TIMEOUT / 1000;
attr.expiry.tv_nsec = (TIMEOUT % 1000) * MILLION;
buf = malloc(sizeof(*msg));
if (buf == NULL)
return INVALID_ADDR;
msg = (struct flat_addr_msg *) buf;
msg->code = FLAT_ADDR_REQ;
msg->addr = flat.addr;
ro_name = addr_name();
if (ro_name == NULL) {
free(buf);
return INVALID_ADDR;
}
pthread_mutex_lock(&flat.lock);
if (ro_exists(ro_name)) {
pthread_mutex_unlock(&flat.lock);
free(ro_name);
free(buf);
continue;
}
if (ro_create(ro_name, &attr, buf, sizeof(*msg))) {
pthread_mutex_unlock(&flat.lock);
free(ro_name);
free(buf);
return INVALID_ADDR;
}
free(ro_name);
while (flat.addr_in_use == false) {
ret = -pthread_cond_timedwait(&flat.cond,
&flat.lock,
&abstime);
if (ret == -ETIMEDOUT)
break;
}
pthread_mutex_unlock(&flat.lock);
}
return flat.addr;
}
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