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Diffstat (limited to 'src/ipcpd/broadcast/dt.c')
-rw-r--r--src/ipcpd/broadcast/dt.c318
1 files changed, 318 insertions, 0 deletions
diff --git a/src/ipcpd/broadcast/dt.c b/src/ipcpd/broadcast/dt.c
new file mode 100644
index 00000000..4d48ac84
--- /dev/null
+++ b/src/ipcpd/broadcast/dt.c
@@ -0,0 +1,318 @@
+/*
+ * Ouroboros - Copyright (C) 2016 - 2018
+ *
+ * Forward loop for broadcast
+ *
+ * Dimitri Staessens <dimitri.staessens@ugent.be>
+ * Sander Vrijders <sander.vrijders@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., http://www.fsf.org/about/contact/.
+ */
+
+#if defined(__linux__) || defined(__CYGWIN__)
+#define _DEFAULT_SOURCE
+#else
+#define _POSIX_C_SOURCE 200112L
+#endif
+
+#include "config.h"
+
+#define BROADCAST_MTU 1400 /* FIXME: avoid packet copy. */
+
+#define DT "dt"
+#define OUROBOROS_PREFIX DT
+
+#include <ouroboros/endian.h>
+#include <ouroboros/dev.h>
+#include <ouroboros/errno.h>
+#include <ouroboros/fqueue.h>
+#include <ouroboros/list.h>
+#include <ouroboros/logs.h>
+#include <ouroboros/notifier.h>
+#include <ouroboros/utils.h>
+
+#include "comp.h"
+#include "connmgr.h"
+#include "dt.h"
+#include "ipcp.h"
+
+#include <assert.h>
+#include <stdlib.h>
+#include <inttypes.h>
+#include <string.h>
+#include <pthread.h>
+
+struct nb {
+ struct list_head next;
+
+ int fd;
+};
+
+struct {
+ struct list_head nbs;
+ size_t nbs_len;
+ pthread_rwlock_t nbs_lock;
+
+ fset_t * set;
+
+ pthread_t reader;
+ pthread_t listener;
+} fwd;
+
+static int dt_add_nb(int fd)
+{
+ struct list_head * p;
+ struct nb * nb;
+
+ pthread_rwlock_wrlock(&fwd.nbs_lock);
+
+ list_for_each(p, &fwd.nbs) {
+ struct nb * el = list_entry(p, struct nb, next);
+ if (el->fd == fd) {
+ log_dbg("Already know neighbor.");
+ pthread_rwlock_unlock(&fwd.nbs_lock);
+ return -EPERM;
+ }
+ }
+
+ nb = malloc(sizeof(*nb));
+ if (nb == NULL) {
+ pthread_rwlock_unlock(&fwd.nbs_lock);
+ return -ENOMEM;
+ }
+
+ nb->fd = fd;
+
+ list_add_tail(&nb->next, p);
+
+ ++fwd.nbs_len;
+
+ log_dbg("Neighbor %d added.", fd);
+
+ pthread_rwlock_unlock(&fwd.nbs_lock);
+
+ return 0;
+}
+
+static int dt_del_nb(int fd)
+{
+ struct list_head * p;
+ struct list_head * h;
+
+ pthread_rwlock_wrlock(&fwd.nbs_lock);
+
+ list_for_each_safe(p, h, &fwd.nbs) {
+ struct nb * nb = list_entry(p, struct nb, next);
+ if (nb->fd == fd) {
+ list_del(&nb->next);
+ --fwd.nbs_len;
+ pthread_rwlock_unlock(&fwd.nbs_lock);
+ log_dbg("Neighbor %d deleted.", nb->fd);
+ free(nb);
+ return 0;
+ }
+ }
+
+ pthread_rwlock_unlock(&fwd.nbs_lock);
+
+ return -EPERM;
+}
+
+static void * dt_conn_handle(void * o)
+{
+ struct conn conn;
+
+ (void) o;
+
+ while (true) {
+ if (connmgr_wait(COMPID_DT, &conn)) {
+ log_err("Failed to get next DT connection.");
+ continue;
+ }
+
+ /* NOTE: connection acceptance policy could be here. */
+
+ notifier_event(NOTIFY_DT_CONN_ADD, &conn);
+ }
+
+ return 0;
+}
+
+
+static void dt_packet(uint8_t * buf,
+ size_t len,
+ int in_fd)
+{
+ struct list_head * p;
+
+ pthread_rwlock_rdlock(&fwd.nbs_lock);
+
+ pthread_cleanup_push((void (*))(void *) pthread_rwlock_unlock,
+ &fwd.nbs_lock);
+
+ list_for_each(p, &fwd.nbs) {
+ struct nb * nb = list_entry(p, struct nb, next);
+ if (nb->fd != in_fd)
+ flow_write(nb->fd, buf, len); /* FIXME: avoid copy. */
+ }
+
+ pthread_cleanup_pop(true);
+}
+
+static void * dt_reader(void * o)
+{
+ fqueue_t * fq;
+ int ret;
+ uint8_t buf[BROADCAST_MTU];
+ int fd;
+ ssize_t len;
+
+ (void) o;
+
+ fq = fqueue_create();
+ if (fq == NULL)
+ return (void *) -1;
+
+ pthread_cleanup_push((void (*) (void *)) fqueue_destroy,
+ (void *) fq);
+
+ while (true) {
+ ret = fevent(fwd.set, fq, NULL);
+ if (ret < 0) {
+ log_warn("Event error: %d.", ret);
+ continue;
+ }
+
+ while ((fd = fqueue_next(fq)) >= 0) {
+ if (fqueue_type(fq) != FLOW_PKT)
+ continue;
+
+ /* FIXME: avoid copy. */
+ len = flow_read(fd, buf, BROADCAST_MTU);
+ if (len < 0)
+ continue;
+
+ dt_packet(buf, len, fd);
+ }
+ }
+
+ pthread_cleanup_pop(true);
+
+ return (void *) 0;
+}
+
+static void handle_event(void * self,
+ int event,
+ const void * o)
+{
+ /* FIXME: Apply correct QoS on graph */
+ struct conn * c;
+
+ (void) self;
+
+ c = (struct conn *) o;
+
+ switch (event) {
+ case NOTIFY_DT_CONN_ADD:
+ if (dt_add_nb(c->flow_info.fd))
+ log_dbg("Failed to add neighbor.");
+ fset_add(fwd.set, c->flow_info.fd);
+ break;
+ case NOTIFY_DT_CONN_DEL:
+ if (dt_del_nb(c->flow_info.fd))
+ log_dbg("Failed to delete neighbor.");
+ fset_del(fwd.set, c->flow_info.fd);
+ break;
+ default:
+ break;
+ }
+}
+
+int dt_init(void)
+{
+ struct conn_info info;
+
+ memset(&info, 0, sizeof(info));
+
+ strcpy(info.comp_name, DT);
+ strcpy(info.comp_name, DT_COMP);
+
+ list_head_init(&fwd.nbs);
+
+ if (notifier_reg(handle_event, NULL))
+ goto fail_notifier_reg;
+
+ if (pthread_rwlock_init(&fwd.nbs_lock, NULL))
+ goto fail_lock_init;
+
+ fwd.set = fset_create();
+ if (fwd.set == NULL)
+ goto fail_fset_create;
+
+ if (pthread_create(&fwd.reader, NULL, dt_reader, NULL))
+ goto fail_pthread_create_reader;
+
+ if (pthread_create(&fwd.listener, NULL, dt_conn_handle, NULL))
+ goto fail_pthread_create_listener;
+
+ if (connmgr_comp_init(COMPID_DT, &info))
+ goto fail_connmgr_comp_init;
+
+ fwd.nbs_len = 0;
+
+ return 0;
+
+ fail_connmgr_comp_init:
+ pthread_cancel(fwd.listener);
+ pthread_join(fwd.listener, NULL);
+ fail_pthread_create_listener:
+ pthread_cancel(fwd.reader);
+ pthread_join(fwd.reader, NULL);
+ fail_pthread_create_reader:
+ fset_destroy(fwd.set);
+ fail_fset_create:
+ pthread_rwlock_destroy(&fwd.nbs_lock);
+ fail_lock_init:
+ notifier_unreg(handle_event);
+ fail_notifier_reg:
+ return -1;
+}
+
+void dt_fini(void)
+{
+ struct list_head * p;
+ struct list_head * h;
+
+ notifier_unreg(handle_event);
+
+ pthread_cancel(fwd.reader);
+ pthread_cancel(fwd.listener);
+
+ pthread_join(fwd.reader, NULL);
+ pthread_join(fwd.listener, NULL);
+
+ fset_destroy(fwd.set);
+
+ pthread_rwlock_wrlock(&fwd.nbs_lock);
+
+ list_for_each_safe(p, h, &fwd.nbs) {
+ struct nb * n = list_entry(p, struct nb, next);
+ list_del(&n->next);
+ free(n);
+ }
+
+ pthread_rwlock_unlock(&fwd.nbs_lock);
+
+ pthread_rwlock_destroy(&fwd.nbs_lock);
+}
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