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-rw-r--r--src/ipcpd/normal/routing.c298
1 files changed, 298 insertions, 0 deletions
diff --git a/src/ipcpd/normal/routing.c b/src/ipcpd/normal/routing.c
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+++ b/src/ipcpd/normal/routing.c
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+/*
+ * Ouroboros - Copyright (C) 2016 - 2017
+ *
+ * Routing component of the IPCP
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#define OUROBOROS_PREFIX "routing"
+
+#include <ouroboros/config.h>
+#include <ouroboros/errno.h>
+#include <ouroboros/list.h>
+#include <ouroboros/logs.h>
+#include <ouroboros/rib.h>
+#include <ouroboros/rqueue.h>
+
+#include "routing.h"
+#include "ribmgr.h"
+#include "ribconfig.h"
+#include "ipcp.h"
+#include "graph.h"
+
+#include <assert.h>
+#include <stdlib.h>
+#include <inttypes.h>
+#include <string.h>
+
+#include "fso.pb-c.h"
+typedef Fso fso_t;
+
+#define BUF_SIZE 256
+
+struct routing_table_entry {
+ struct list_head next;
+ uint64_t dst;
+ uint64_t nhop;
+};
+
+struct routing_i {
+ struct pff * pff;
+};
+
+struct {
+ struct nbs * nbs;
+ struct nb_notifier nb_notifier;
+
+ struct graph * graph;
+
+ ro_set_t * set;
+ rqueue_t * queue;
+ pthread_t rib_listener;
+} routing;
+
+struct routing_i * routing_i_create(struct pff * pff)
+{
+ struct routing_i * tmp;
+
+ assert(pff);
+
+ tmp = malloc(sizeof(*tmp));
+ if (tmp == NULL)
+ return NULL;
+
+ tmp->pff = pff;
+
+ return tmp;
+}
+
+void routing_i_destroy(struct routing_i * instance)
+{
+ assert(instance);
+
+ free(instance);
+}
+
+static int routing_neighbor_event(enum nb_event event,
+ struct conn conn)
+{
+ char path[RIB_MAX_PATH_LEN + 1];
+ char fso_name[RIB_MAX_PATH_LEN + 1];
+ fso_t fso = FSO__INIT;
+ size_t len;
+ uint8_t * data;
+
+ sprintf(fso_name, "%" PRIx64 "-%" PRIx64,
+ ipcpi.dt_addr, conn.conn_info.addr);
+ rib_path_append(rib_path_append(path, ROUTING_PATH), fso_name);
+
+ switch (event) {
+ case NEIGHBOR_ADDED:
+ fso.s_addr = ipcpi.dt_addr;
+ fso.d_addr = conn.conn_info.addr;
+
+ len = fso__get_packed_size(&fso);
+ if (len == 0)
+ return -1;
+
+ data = malloc(len);
+ if (data == NULL)
+ return -1;
+
+ fso__pack(&fso, data);
+
+ if (rib_add(ROUTING_PATH, fso_name)) {
+ log_err("Failed to add FSO.");
+ free(data);
+ return -1;
+ }
+
+ if (rib_put(path, data, len)) {
+ log_err("Failed to put FSO in RIB.");
+ rib_del(path);
+ free(data);
+ return -1;
+ }
+
+ break;
+ case NEIGHBOR_REMOVED:
+ if (rib_del(path)) {
+ log_err("Failed to remove FSO.");
+ return -1;
+ }
+
+ break;
+ case NEIGHBOR_QOS_CHANGE:
+ log_info("Not currently supported.");
+ break;
+ default:
+ log_info("Unsupported event for routing.");
+ break;
+ }
+
+ return 0;
+}
+
+static int read_fso(char * path,
+ int32_t flag)
+{
+ ssize_t len;
+ uint8_t ro[BUF_SIZE];
+ fso_t * fso;
+ qosspec_t qs;
+
+ len = rib_read(path, ro, BUF_SIZE);
+ if (len < 0) {
+ log_err("Failed to read FSO.");
+ return -1;
+ }
+
+ fso = fso__unpack(NULL, len, ro);
+ if (fso == NULL) {
+ log_err("Failed to unpack.");
+ return -1;
+ }
+
+ if (flag & RO_CREATE) {
+ if (graph_add_edge(routing.graph,
+ fso->s_addr, fso->d_addr, qs)) {
+ log_err("Failed to add edge to graph.");
+ fso__free_unpacked(fso, NULL);
+ return -1;
+ }
+ } else if (flag & RO_MODIFY) {
+ if (graph_update_edge(routing.graph,
+ fso->s_addr, fso->d_addr, qs)) {
+ log_err("Failed to update edge of graph.");
+ fso__free_unpacked(fso, NULL);
+ return -1;
+ }
+ } else if (flag & RO_DELETE) {
+ if (graph_del_edge(routing.graph, fso->s_addr, fso->d_addr)) {
+ log_err("Failed to del edge of graph.");
+ fso__free_unpacked(fso, NULL);
+ return -1;
+ }
+ }
+
+ fso__free_unpacked(fso, NULL);
+
+ return 0;
+}
+
+static void * rib_listener(void * o)
+{
+ int32_t flag;
+ char path[RIB_MAX_PATH_LEN + 1];
+ char ** children;
+ ssize_t len;
+ int i;
+
+ (void) o;
+
+ if (ro_set_add(routing.set, ROUTING_PATH,
+ RO_MODIFY | RO_CREATE | RO_DELETE)) {
+ log_err("Failed to add to RO set");
+ return (void * ) -1;
+ }
+
+ len = rib_children(ROUTING_PATH, &children);
+ if (len < 0) {
+ log_err("Failed to retrieve children.");
+ return (void *) -1;
+ }
+
+ for (i = 0; i < len; i++) {
+ if (read_fso(children[i], RO_CREATE)) {
+ log_err("Failed to parse FSO.");
+ continue;
+ }
+ }
+
+ while (rib_event_wait(routing.set, routing.queue, NULL)) {
+ flag = rqueue_next(routing.queue, path);
+ if (flag < 0)
+ continue;
+
+ if (read_fso(children[i], flag)) {
+ log_err("Failed to parse FSO.");
+ continue;
+ }
+ }
+
+ return (void *) 0;
+}
+
+int routing_init(struct nbs * nbs)
+{
+ routing.graph = graph_create();
+ if (routing.graph == NULL)
+ return -1;
+
+ if (rib_add(RIB_ROOT, ROUTING_NAME)) {
+ graph_destroy(routing.graph);
+ return -1;
+ }
+
+ routing.nbs = nbs;
+
+ routing.nb_notifier.notify_call = routing_neighbor_event;
+ if (nbs_reg_notifier(routing.nbs, &routing.nb_notifier)) {
+ graph_destroy(routing.graph);
+ rib_del(ROUTING_PATH);
+ return -1;
+ }
+
+ routing.set = ro_set_create();
+ if (routing.set == NULL) {
+ nbs_unreg_notifier(routing.nbs, &routing.nb_notifier);
+ graph_destroy(routing.graph);
+ rib_del(ROUTING_PATH);
+ return -1;
+ }
+
+ routing.queue = rqueue_create();
+ if (routing.queue == NULL) {
+ ro_set_destroy(routing.set);
+ nbs_unreg_notifier(routing.nbs, &routing.nb_notifier);
+ graph_destroy(routing.graph);
+ rib_del(ROUTING_PATH);
+ return -1;
+ }
+
+ pthread_create(&routing.rib_listener, NULL, rib_listener, NULL);
+
+ return 0;
+}
+
+void routing_fini(void)
+{
+ pthread_cancel(routing.rib_listener);
+
+ pthread_join(routing.rib_listener, NULL);
+
+ rqueue_destroy(routing.queue);
+
+ ro_set_destroy(routing.set);
+
+ graph_destroy(routing.graph);
+
+ rib_del(ROUTING_PATH);
+
+ nbs_unreg_notifier(routing.nbs, &routing.nb_notifier);
+}
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