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-rw-r--r--src/ipcpd/normal/gam.c339
1 files changed, 339 insertions, 0 deletions
diff --git a/src/ipcpd/normal/gam.c b/src/ipcpd/normal/gam.c
new file mode 100644
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--- /dev/null
+++ b/src/ipcpd/normal/gam.c
@@ -0,0 +1,339 @@
+/*
+ * Ouroboros - Copyright (C) 2016 - 2017
+ *
+ * Graph adjacency manager for IPC Process components
+ *
+ * Dimitri Staeesens <dimitri.staessens@intec.ugent.be>
+ * 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 "graph-adjacency-manager"
+
+#include <ouroboros/config.h>
+#include <ouroboros/dev.h>
+#include <ouroboros/logs.h>
+#include <ouroboros/cacep.h>
+#include <ouroboros/list.h>
+#include <ouroboros/errno.h>
+
+#include "ribmgr.h"
+#include "ipcp.h"
+#include "ro.h"
+#include "pathname.h"
+#include "gam.h"
+
+#include <assert.h>
+#include <stdlib.h>
+#include <pthread.h>
+#include <string.h>
+
+#define RO_DIR "neighbors"
+
+struct ga {
+ struct list_head next;
+
+ qosspec_t qs;
+ int fd;
+ struct cacep_info * info;
+};
+
+struct gam {
+ struct list_head gas;
+ pthread_mutex_t gas_lock;
+ pthread_cond_t gas_cond;
+
+ char * ae_name;
+
+ /* FIXME: Keep a list of known members */
+
+ pthread_t allocator;
+};
+
+static void * allocator(void * o)
+{
+ qosspec_t qs;
+ ssize_t len;
+ char ** children;
+ struct gam * instance;
+ int i;
+ char * ro_name;
+
+ instance = (struct gam *) o;
+
+ qs.delay = 0;
+ qs.jitter = 0;
+
+ ro_name = pathname_create(RO_DIR);
+ if (ro_name == NULL)
+ return (void *) -1;
+
+ len = ro_children(ro_name, &children);
+ if (len > 0) {
+ for (i = 0; i < len; i++) {
+ if (strcmp(children[i], ipcpi.name) == 0)
+ continue;
+ gam_flow_alloc(instance, children[i], qs);
+ }
+ }
+
+ pathname_destroy(ro_name);
+
+ return (void *) 0;
+}
+
+struct gam * gam_create(char * ae_name)
+{
+ struct gam * tmp;
+ struct ro_attr attr;
+ char * ro_name;
+
+ tmp = malloc(sizeof(*tmp));
+ if (tmp == NULL)
+ return NULL;
+
+ INIT_LIST_HEAD(&tmp->gas);
+
+ tmp->ae_name = strdup(ae_name);
+ if (tmp->ae_name == NULL) {
+ free(tmp);
+ return NULL;
+ }
+
+ if (pthread_mutex_init(&tmp->gas_lock, NULL)) {
+ free(tmp->ae_name);
+ free(tmp);
+ return NULL;
+ }
+
+ if (pthread_cond_init(&tmp->gas_cond, NULL)) {
+ pthread_mutex_destroy(&tmp->gas_lock);
+ free(tmp->ae_name);
+ free(tmp);
+ return NULL;
+ }
+
+ ro_attr_init(&attr);
+ attr.enrol_sync = true;
+ attr.recv_set = ALL_MEMBERS;
+
+ ro_name = pathname_create(RO_DIR);
+ if (ro_name == NULL) {
+ pthread_mutex_destroy(&tmp->gas_lock);
+ free(tmp->ae_name);
+ free(tmp);
+ return NULL;
+ }
+
+ if (!ro_exists(RO_DIR)) {
+ if (ro_create(ro_name, &attr, NULL, 0)) {
+ pathname_destroy(ro_name);
+ pthread_mutex_destroy(&tmp->gas_lock);
+ free(tmp->ae_name);
+ free(tmp);
+ return NULL;
+ }
+ }
+
+ ro_name = pathname_append(ro_name, ipcpi.name);
+ if (ro_name == NULL) {
+ pathname_destroy(ro_name);
+ pthread_mutex_destroy(&tmp->gas_lock);
+ free(tmp->ae_name);
+ free(tmp);
+ return NULL;
+ }
+
+ if (ro_create(ro_name, &attr, NULL, 0)) {
+ pathname_destroy(ro_name);
+ pthread_mutex_destroy(&tmp->gas_lock);
+ free(tmp->ae_name);
+ free(tmp);
+ return NULL;
+ }
+ pathname_destroy(ro_name);
+
+ if (pthread_create(&tmp->allocator, NULL, allocator, (void *) tmp)) {
+ pthread_cond_destroy(&tmp->gas_cond);
+ pthread_mutex_destroy(&tmp->gas_lock);
+ free(tmp->ae_name);
+ free(tmp);
+ return NULL;
+ }
+
+ return tmp;
+}
+
+void gam_destroy(struct gam * instance)
+{
+ struct list_head * p = NULL;
+ struct list_head * n = NULL;
+
+ assert(instance);
+
+ pthread_cancel(instance->allocator);
+ pthread_join(instance->allocator, NULL);
+
+ pthread_mutex_destroy(&instance->gas_lock);
+ pthread_cond_destroy(&instance->gas_cond);
+
+ list_for_each_safe(p, n, &instance->gas) {
+ struct ga * e = list_entry(p, struct ga, next);
+ list_del(&e->next);
+ free(e->info);
+ free(e);
+ }
+
+ free(instance->ae_name);
+ free(instance);
+}
+
+static int add_ga(struct gam * instance,
+ int fd,
+ qosspec_t qs,
+ struct cacep_info * info)
+{
+ struct ga * ga;
+
+ ga = malloc(sizeof(*ga));
+ if (ga == NULL)
+ return -ENOMEM;
+
+ ga->fd = fd;
+ ga->info = info;
+ ga->qs = qs;
+
+ INIT_LIST_HEAD(&ga->next);
+
+ pthread_mutex_lock(&instance->gas_lock);
+ list_add(&ga->next, &instance->gas);
+ pthread_cond_signal(&instance->gas_cond);
+ pthread_mutex_unlock(&instance->gas_lock);
+
+ return 0;
+}
+
+int gam_flow_arr(struct gam * instance,
+ int fd,
+ qosspec_t qs)
+{
+ struct cacep * cacep;
+ struct cacep_info * info;
+
+ if (flow_alloc_resp(fd, 0) < 0) {
+ LOG_ERR("Could not respond to new flow.");
+ return -1;
+ }
+
+ cacep = cacep_create(fd, ipcpi.name, ribmgr_address());
+ if (cacep == NULL) {
+ LOG_ERR("Failed to create CACEP instance.");
+ return -1;
+ }
+
+ info = cacep_auth_wait(cacep);
+ if (info == NULL) {
+ LOG_ERR("Other side failed to authenticate.");
+ cacep_destroy(cacep);
+ return -1;
+ }
+ cacep_destroy(cacep);
+
+ if (add_ga(instance, fd, qs, info)) {
+ LOG_ERR("Failed to add ga to graph adjacency manager list.");
+ free(info);
+ return -1;
+ }
+
+ return 0;
+}
+
+int gam_flow_alloc(struct gam * instance,
+ char * dst_name,
+ qosspec_t qs)
+{
+ struct cacep * cacep;
+ struct cacep_info * info;
+ int fd;
+
+ fd = flow_alloc(dst_name, instance->ae_name, NULL);
+ if (fd < 0) {
+ LOG_ERR("Failed to allocate flow to %s.", dst_name);
+ return -1;
+ }
+
+ if (flow_alloc_res(fd)) {
+ LOG_ERR("Flow allocation to %s failed.", dst_name);
+ flow_dealloc(fd);
+ return -1;
+ }
+
+ cacep = cacep_create(fd, ipcpi.name, ribmgr_address());
+ if (cacep == NULL) {
+ LOG_ERR("Failed to create CACEP instance.");
+ return -1;
+ }
+
+ info = cacep_auth(cacep);
+ if (info == NULL) {
+ LOG_ERR("Failed to authenticate.");
+ cacep_destroy(cacep);
+ return -1;
+ }
+ cacep_destroy(cacep);
+
+ if (add_ga(instance, fd, qs, info)) {
+ LOG_ERR("Failed to add ga to graph adjacency manager list.");
+ free(info);
+ return -1;
+ }
+
+ return 0;
+}
+
+int gam_flow_wait(struct gam * instance,
+ int * fd,
+ struct cacep_info ** info,
+ qosspec_t * qs)
+{
+ struct ga * ga;
+
+ assert(fd);
+ assert(info);
+ assert(qs);
+
+ pthread_mutex_lock(&instance->gas_lock);
+
+ while (list_empty(&instance->gas))
+ pthread_cond_wait(&instance->gas_cond, &instance->gas_lock);
+
+ ga = list_first_entry((&instance->gas), struct ga, next);
+ if (ga == NULL) {
+ pthread_mutex_unlock(&instance->gas_lock);
+ LOG_ERR("Ga was NULL.");
+ return -1;
+ }
+
+ *fd = ga->fd;
+ *info = ga->info;
+ *qs = ga->qs;
+
+ list_del(&ga->next);
+ free(ga);
+
+ pthread_mutex_unlock(&instance->gas_lock);
+
+ return 0;
+}
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