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-rw-r--r--src/ipcpd/normal/pol/flat.c255
-rw-r--r--src/ipcpd/normal/pol/flat.h30
2 files changed, 285 insertions, 0 deletions
diff --git a/src/ipcpd/normal/pol/flat.c b/src/ipcpd/normal/pol/flat.c
new file mode 100644
index 00000000..a428da20
--- /dev/null
+++ b/src/ipcpd/normal/pol/flat.c
@@ -0,0 +1,255 @@
+/*
+ * Ouroboros - Copyright (C) 2016
+ *
+ * Policy for flat addresses in a distributed way
+ *
+ * Sander Vrijders <[email protected]>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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 "path.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));
+
+ 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;
+ char * name;
+
+ srand(time(NULL));
+ 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_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_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;
+}
diff --git a/src/ipcpd/normal/pol/flat.h b/src/ipcpd/normal/pol/flat.h
new file mode 100644
index 00000000..51cb511b
--- /dev/null
+++ b/src/ipcpd/normal/pol/flat.h
@@ -0,0 +1,30 @@
+/*
+ * Ouroboros - Copyright (C) 2016
+ *
+ * Policy for flat addresses in a distributed way
+ *
+ * Sander Vrijders <[email protected]>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ */
+
+#ifndef OUROBOROS_FLAT
+#define OUROBOROS_FLAT
+
+int flat_init(void);
+int flat_fini(void);
+uint64_t flat_address(void);
+
+#endif /* OUROBOROS_FLAT */
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