ipcpd: normal: Make routing a policy

This makes the routing component into a policy since different
approaches may exist to do this, depending on how high the rank of the
DIF is.

1 files changed, 0 insertions, 517 deletions

diff --git a/src/ipcpd/normal/graph.c b/src/ipcpd/normal/graph.c
deleted file mode 100644
index 78ed203d..00000000
--- a/src/ipcpd/normal/graph.c
+++ /dev/null
@@ -1,517 +0,0 @@
-/*
- * Ouroboros - Copyright (C) 2016 - 2017
- *
- * Undirected graph structure
- *
- *    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 "graph"
-
-#include <ouroboros/config.h>
-#include <ouroboros/logs.h>
-#include <ouroboros/errno.h>
-#include <ouroboros/list.h>
-
-#include "graph.h"
-#include "ipcp.h"
-
-#include <assert.h>
-#include <pthread.h>
-#include <stdlib.h>
-#include <limits.h>
-
-struct edge {
-        struct list_head next;
-        struct vertex *  nb;
-        qosspec_t        qs;
-};
-
-struct vertex {
-        struct list_head next;
-        uint64_t         addr;
-        struct list_head edges;
-};
-
-struct graph {
-        size_t           nr_vertices;
-        struct list_head vertices;
-        pthread_mutex_t  lock;
-};
-
-static struct edge * find_edge_by_addr(struct vertex * vertex,
-                                       uint64_t        dst_addr)
-{
-        struct list_head * p = NULL;
-
-        list_for_each(p, &vertex->edges) {
-                struct edge * e = list_entry(p, struct edge, next);
-                if (e->nb->addr == dst_addr)
-                        return e;
-        }
-
-        return NULL;
-}
-
-static struct vertex * find_vertex_by_addr(struct graph * graph,
-                                           uint64_t       addr)
-{
-        struct list_head * p = NULL;
-
-        list_for_each(p, &graph->vertices) {
-                struct vertex * e = list_entry(p, struct vertex, next);
-                if (e->addr == addr)
-                        return e;
-        }
-
-        return NULL;
-}
-
-static struct edge * add_edge(struct vertex * vertex,
-                              struct vertex * nb)
-{
-        struct edge * edge;
-
-        edge = malloc(sizeof(*edge));
-        if (edge == NULL)
-                return NULL;
-
-        list_head_init(&edge->next);
-        edge->nb = nb;
-
-        list_add(&edge->next, &vertex->edges);
-
-        return edge;
-}
-
-static void del_edge(struct edge * edge)
-{
-       list_del(&edge->next);
-       free(edge);
-}
-
-static struct vertex * add_vertex(struct graph * graph,
-                                  uint64_t       addr)
-{
-        struct vertex *    vertex;
-        struct list_head * p;
-
-        vertex = malloc(sizeof(*vertex));
-        if (vertex == NULL)
-                return NULL;
-
-        list_head_init(&vertex->next);
-        list_head_init(&vertex->edges);
-        vertex->addr = addr;
-
-        list_for_each(p, &graph->vertices) {
-                struct vertex * v = list_entry(p, struct vertex, next);
-                if (v->addr > addr)
-                        break;
-        }
-
-        list_add_tail(&vertex->next, p);
-
-        graph->nr_vertices++;
-
-        return vertex;
-}
-
-static void del_vertex(struct graph * graph,
-                       struct vertex * vertex)
-{
-        struct list_head * p = NULL;
-        struct list_head * n = NULL;
-
-        list_del(&vertex->next);
-
-        list_for_each_safe(p, n, &vertex->edges) {
-                struct edge * e = list_entry(p, struct edge, next);
-                del_edge(e);
-        }
-
-        free(vertex);
-
-        graph->nr_vertices--;
-}
-
-struct graph * graph_create(void)
-{
-        struct graph * graph;
-
-        graph = malloc(sizeof(*graph));
-        if (graph == NULL)
-                return NULL;
-
-        if (pthread_mutex_init(&graph->lock, NULL)) {
-                free(graph);
-                return NULL;
-        }
-
-        graph->nr_vertices = 0;
-        list_head_init(&graph->vertices);
-
-        return graph;
-}
-
-void graph_destroy(struct graph * graph)
-{
-        struct list_head * p = NULL;
-        struct list_head * n = NULL;
-
-        assert(graph);
-
-        pthread_mutex_lock(&graph->lock);
-
-        list_for_each_safe(p, n, &graph->vertices) {
-                struct vertex * e = list_entry(p, struct vertex, next);
-                del_vertex(graph, e);
-        }
-
-        pthread_mutex_unlock(&graph->lock);
-
-        pthread_mutex_destroy(&graph->lock);
-
-        free(graph);
-}
-
-int graph_update_edge(struct graph * graph,
-                      uint64_t       s_addr,
-                      uint64_t       d_addr,
-                      qosspec_t      qs)
-{
-        struct vertex * v;
-        struct edge *   e;
-        struct vertex * nb;
-        struct edge *   nb_e;
-
-        assert(graph);
-
-        pthread_mutex_lock(&graph->lock);
-
-        v = find_vertex_by_addr(graph, s_addr);
-        if (v == NULL) {
-                v = add_vertex(graph, s_addr);
-                if (v == NULL) {
-                        pthread_mutex_unlock(&graph->lock);
-                        log_err("Failed to add vertex.");
-                        return -ENOMEM;
-                }
-        }
-
-        nb = find_vertex_by_addr(graph, d_addr);
-        if (nb == NULL) {
-                nb = add_vertex(graph, d_addr);
-                if (nb == NULL) {
-                        if (list_is_empty(&v->edges))
-                                del_vertex(graph, v);
-                        pthread_mutex_unlock(&graph->lock);
-                        log_err("Failed to add vertex.");
-                        return -ENOMEM;
-                }
-        }
-
-        e = find_edge_by_addr(v, d_addr);
-        if (e == NULL) {
-                e = add_edge(v, nb);
-                if (e == NULL) {
-                        if (list_is_empty(&v->edges))
-                            del_vertex(graph, v);
-                        if (list_is_empty(&nb->edges))
-                                del_vertex(graph, nb);
-                        pthread_mutex_unlock(&graph->lock);
-                        log_err("Failed to add edge.");
-                        return -ENOMEM;
-                }
-        }
-
-        e->qs = qs;
-
-        nb_e = find_edge_by_addr(nb, s_addr);
-        if (nb_e == NULL) {
-                nb_e = add_edge(nb, v);
-                if (nb_e == NULL) {
-                        del_edge(e);
-                        if (list_is_empty(&v->edges))
-                                del_vertex(graph, v);
-                        if (list_is_empty(&nb->edges))
-                                del_vertex(graph, nb);
-                        pthread_mutex_unlock(&graph->lock);
-                        log_err("Failed to add edge.");
-                        return -ENOMEM;
-                }
-        }
-
-        nb_e->qs = qs;
-
-        pthread_mutex_unlock(&graph->lock);
-
-        return 0;
-}
-
-int graph_del_edge(struct graph * graph,
-                   uint64_t       s_addr,
-                   uint64_t       d_addr)
-{
-        struct vertex * v;
-        struct edge *   e;
-        struct vertex * nb;
-        struct edge *   nb_e;
-
-        assert(graph);
-
-        pthread_mutex_lock(&graph->lock);
-
-        v = find_vertex_by_addr(graph, s_addr);
-        if (v == NULL) {
-                pthread_mutex_unlock(&graph->lock);
-                log_err("No such vertex.");
-                return -1;
-        }
-
-        nb = find_vertex_by_addr(graph, d_addr);
-        if (nb == NULL) {
-                pthread_mutex_unlock(&graph->lock);
-                log_err("No such vertex.");
-                return -1;
-        }
-
-        e = find_edge_by_addr(v, d_addr);
-        if (e == NULL) {
-                pthread_mutex_unlock(&graph->lock);
-                log_err("No such edge.");
-                return -1;
-        }
-
-        nb_e = find_edge_by_addr(nb, s_addr);
-        if (nb_e == NULL) {
-                pthread_mutex_unlock(&graph->lock);
-                log_err("No such edge.");
-                return -1;
-        }
-
-        del_edge(e);
-        del_edge(nb_e);
-
-        /* Removing vertex if it was the last edge */
-        if (list_is_empty(&v->edges))
-                del_vertex(graph, v);
-        if (list_is_empty(&nb->edges))
-                del_vertex(graph, nb);
-
-        pthread_mutex_unlock(&graph->lock);
-
-        return 0;
-}
-
-static int get_min_vertex(struct vertex ** vertices,
-                          int              nr_vertices,
-                          int *            dist,
-                          struct vertex ** v)
-{
-        int min = INT_MAX;
-        int index = -1;
-        int i;
-
-        *v = NULL;
-
-        for (i = 0; i < nr_vertices; i++) {
-                if (vertices[i] == NULL)
-                        continue;
-
-                if (dist[i] < min) {
-                        *v = vertices[i];
-                        min = dist[i];
-                        index = i;
-                }
-        }
-
-        if (index != -1)
-                vertices[index] = NULL;
-
-        return index;
-}
-
-static int get_vertex_number(struct vertex ** vertices,
-                             int              nr_vertices,
-                             struct vertex *  v)
-
-{
-        int i;
-
-        for (i = 0; i < nr_vertices; i++) {
-                if (vertices[i] == v)
-                        return i;
-        }
-
-        return -1;
-}
-
-static int get_vertex_index(struct graph *  graph,
-                            struct vertex * v)
-
-{
-        struct list_head * p = NULL;
-        struct vertex *    vertex;
-        int                i = 0;
-
-        list_for_each(p, &graph->vertices) {
-                vertex = list_entry(p, struct vertex, next);
-                if (vertex == v)
-                        return i;
-                i++;
-        }
-
-        return -1;
-}
-
-static struct vertex ** dijkstra(struct graph * graph,
-                                 uint64_t       src)
-{
-        int                dist[graph->nr_vertices];
-        struct vertex *    vertices[graph->nr_vertices];
-        struct list_head * p = NULL;
-        int                i = 0;
-        int                j = 0;
-        struct vertex *    v = NULL;
-        struct edge *      e = NULL;
-        int                alt;
-        struct vertex **   prev;
-
-        prev = malloc(sizeof(*prev) * graph->nr_vertices);
-        if (prev == NULL)
-                return NULL;
-
-        /* Init the data structures */
-        list_for_each(p, &graph->vertices) {
-                v = list_entry(p, struct vertex, next);
-                vertices[i] = v;
-                if (v->addr == src)
-                        dist[i] = 0;
-                else
-                        dist[i] = INT_MAX;
-                prev[i] = NULL;
-                i++;
-        }
-
-        /* Perform actual Dijkstra */
-        i = get_min_vertex(vertices, graph->nr_vertices, dist, &v);
-        while (v != NULL) {
-                list_for_each(p, &v->edges) {
-                        e = list_entry(p, struct edge, next);
-
-                        j = get_vertex_number(vertices,
-                                              graph->nr_vertices,
-                                              e->nb);
-                        if (j == -1)
-                                continue;
-
-                        /*
-                         * NOTE: Current weight is just hop count.
-                         * Method could be extended to use a different
-                         * weight for a different QoS cube.
-                         */
-                        alt = dist[i] + 1;
-                        if (alt < dist[j]) {
-                                dist[j] = alt;
-                                prev[j] = v;
-                        }
-                }
-                i = get_min_vertex(vertices, graph->nr_vertices, dist, &v);
-        }
-
-        return prev;
-}
-
-ssize_t graph_routing_table(struct graph *           graph,
-                            uint64_t                 s_addr,
-                            struct routing_table *** table)
-{
-        struct vertex **   prevs;
-        struct list_head * p = NULL;
-        int                i = 0;
-        int                index = 0;
-        int                j = 0;
-        int                k = 0;
-        struct vertex *    prev;
-        struct vertex *    nhop;
-        struct vertex *    v;
-
-        pthread_mutex_lock(&graph->lock);
-
-        if (graph->nr_vertices == 0) {
-                pthread_mutex_unlock(&graph->lock);
-                return 0;
-        }
-
-        prevs = dijkstra(graph, s_addr);
-        if (prevs == NULL) {
-                pthread_mutex_unlock(&graph->lock);
-                return -1;
-        }
-
-        *table = malloc(sizeof(**table) * (graph->nr_vertices - 1));
-        if (*table == NULL) {
-                pthread_mutex_unlock(&graph->lock);
-                free(prevs);
-                return -1;
-        }
-
-        /*
-         * Now loop through the list of predecessors
-         * to construct the routing table
-         */
-        list_for_each(p, &graph->vertices) {
-                v = list_entry(p, struct vertex, next);
-                prev = prevs[i];
-                nhop = v;
-
-                /* This is the src */
-                if (prev == NULL) {
-                        i++;
-                        continue;
-                }
-
-                index = get_vertex_index(graph, prev);
-                while (prevs[index] != NULL) {
-                        nhop = prev;
-                        prev = prevs[index];
-                        index = get_vertex_index(graph, prev);
-                }
-
-                (*table)[j] = malloc(sizeof(***table));
-                if ((*table)[j] == NULL) {
-                        pthread_mutex_unlock(&graph->lock);
-                        for (k = 0; k < j; ++k)
-                                free((*table)[k]);
-                        free(*table);
-                        free(prevs);
-                        return -1;
-                }
-
-                (*table)[j]->dst = v->addr;
-                (*table)[j]->nhop = nhop->addr;
-                j++;
-                i++;
-        }
-
-        pthread_mutex_unlock(&graph->lock);
-
-        free(prevs);
-
-        return j;
-}