ipcpd: Restructure policy code

The policies were all in a single folder pol/, and have been moved to
a folder per component/mechanism to keep things a bit more orderly.

Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks>
Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>

1 files changed, 0 insertions, 849 deletions

diff --git a/src/ipcpd/unicast/pol/graph.c b/src/ipcpd/unicast/pol/graph.c
deleted file mode 100644
index 6ea5c507..00000000
--- a/src/ipcpd/unicast/pol/graph.c
+++ /dev/null
@@ -1,849 +0,0 @@
-/*
- * Ouroboros - Copyright (C) 2016 - 2021
- *
- * Undirected graph structure
- *
- *    Dimitri Staessens <dimitri@ouroboros.rocks>
- *    Sander Vrijders   <sander@ouroboros.rocks>
- *    Nick Aerts        <nick.aerts@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
-
-#define OUROBOROS_PREFIX "graph"
-
-#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>
-#include <string.h>
-
-struct vertex {
-        struct list_head next;
-        uint64_t         addr;
-        struct list_head edges;
-        int              index;
-};
-
-struct edge {
-        struct list_head next;
-        struct vertex *  nb;
-        qosspec_t        qs;
-        int              announced;
-};
-
-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;
-
-        assert(vertex);
-
-        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;
-
-        assert(graph);
-
-        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;
-
-        assert(vertex);
-        assert(nb);
-
-        edge = malloc(sizeof(*edge));
-        if (edge == NULL)
-                return NULL;
-
-        edge->nb = nb;
-        edge->announced = 0;
-
-        list_add(&edge->next, &vertex->edges);
-
-        return edge;
-}
-
-static void del_edge(struct edge * edge)
-{
-        assert(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;
-        int                i = 0;
-
-        assert(graph);
-
-        vertex = malloc(sizeof(*vertex));
-        if (vertex == NULL)
-                return NULL;
-
-        list_head_init(&vertex->edges);
-        vertex->addr = addr;
-
-        /* Keep them ordered on address. */
-        list_for_each(p, &graph->vertices) {
-                struct vertex * v = list_entry(p, struct vertex, next);
-                if (v->addr > addr)
-                        break;
-                i++;
-        }
-
-        vertex->index = i;
-
-        list_add_tail(&vertex->next, p);
-
-        /* Increase the index of the vertices to the right. */
-        list_for_each(p, &graph->vertices) {
-                struct vertex * v = list_entry(p, struct vertex, next);
-                if (v->addr > addr)
-                        v->index++;
-        }
-
-        graph->nr_vertices++;
-
-        return vertex;
-}
-
-static void del_vertex(struct graph *  graph,
-                       struct vertex * vertex)
-{
-        struct list_head * p;
-        struct list_head * h;
-
-        assert(graph);
-        assert(vertex);
-
-        list_del(&vertex->next);
-
-        /* Decrease the index of the vertices to the right. */
-        list_for_each(p, &graph->vertices) {
-                struct vertex * v = list_entry(p, struct vertex, next);
-                if (v->addr > vertex->addr)
-                        v->index--;
-        }
-
-        list_for_each_safe(p, h, &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->announced++;
-        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) {
-                        if (--e->announced == 0)
-                                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->announced++;
-        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 source vertex.");
-                return -1;
-        }
-
-        nb = find_vertex_by_addr(graph, d_addr);
-        if (nb == NULL) {
-                pthread_mutex_unlock(&graph->lock);
-                log_err("No such destination vertex.");
-                return -1;
-        }
-
-        e = find_edge_by_addr(v, d_addr);
-        if (e == NULL) {
-                pthread_mutex_unlock(&graph->lock);
-                log_err("No such source 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 destination edge.");
-                return -1;
-        }
-
-        if (--e->announced == 0)
-                del_edge(e);
-        if (--nb_e->announced == 0)
-                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 graph *   graph,
-                          int *            dist,
-                          bool *           used,
-                          struct vertex ** v)
-{
-        int                min = INT_MAX;
-        int                index = -1;
-        int                i = 0;
-        struct list_head * p;
-
-        assert(v);
-        assert(graph);
-        assert(dist);
-        assert(used);
-
-        *v = NULL;
-
-        list_for_each(p, &graph->vertices) {
-                if (!used[i] && dist[i] < min) {
-                        min = dist[i];
-                        index = i;
-                        *v = list_entry(p, struct vertex, next);
-                }
-
-                i++;
-        }
-
-        if (index != -1)
-                used[index] = true;
-
-        return index;
-}
-
-static int dijkstra(struct graph *    graph,
-                    uint64_t          src,
-                    struct vertex *** nhops,
-                    int **            dist)
-{
-        bool *             used;
-        struct list_head * p = NULL;
-        int                i = 0;
-        struct vertex *    v = NULL;
-        struct edge *      e = NULL;
-        int                alt;
-
-        assert(graph);
-        assert(nhops);
-        assert(dist);
-
-        *nhops = malloc(sizeof(**nhops) * graph->nr_vertices);
-        if (*nhops == NULL)
-                goto fail_pnhops;
-
-        *dist = malloc(sizeof(**dist) * graph->nr_vertices);
-        if (*dist == NULL)
-                goto fail_pdist;
-
-        used = malloc(sizeof(*used) * graph->nr_vertices);
-        if (used == NULL)
-                goto fail_used;
-
-        /* Init the data structures */
-        memset(used, 0, sizeof(*used) * graph->nr_vertices);
-        memset(*nhops, 0, sizeof(**nhops) * graph->nr_vertices);
-        memset(*dist, 0, sizeof(**dist) * graph->nr_vertices);
-
-        list_for_each(p, &graph->vertices) {
-                v = list_entry(p, struct vertex, next);
-                (*dist)[i++]  = (v->addr == src) ? 0 : INT_MAX;
-        }
-
-        /* Perform actual Dijkstra */
-        i = get_min_vertex(graph, *dist, used, &v);
-        while (v != NULL) {
-                list_for_each(p, &v->edges) {
-                        e = list_entry(p, struct edge, next);
-
-                        /* Only include it if both sides announced it. */
-                        if (e->announced != 2)
-                                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)[e->nb->index]) {
-                                (*dist)[e->nb->index] = alt;
-                                if (v->addr == src)
-                                        (*nhops)[e->nb->index] = e->nb;
-                                else
-                                        (*nhops)[e->nb->index] = (*nhops)[i];
-                        }
-                }
-                i = get_min_vertex(graph, *dist, used, &v);
-        }
-
-        free(used);
-
-        return 0;
-
- fail_used:
-        free(*dist);
- fail_pdist:
-        free(*nhops);
- fail_pnhops:
-        return -1;
-
-}
-
-static void free_routing_table(struct list_head * table)
-{
-        struct list_head * h;
-        struct list_head * p;
-        struct list_head * q;
-        struct list_head * i;
-
-        assert(table);
-
-        list_for_each_safe(p, h, table) {
-                struct routing_table * t =
-                        list_entry(p, struct routing_table, next);
-                list_for_each_safe(q, i, &t->nhops) {
-                        struct nhop * n =
-                                list_entry(q, struct nhop, next);
-                        list_del(&n->next);
-                        free(n);
-                }
-                list_del(&t->next);
-                free(t);
-        }
-}
-
-void graph_free_routing_table(struct graph *     graph,
-                              struct list_head * table)
-{
-        assert(table);
-
-        pthread_mutex_lock(&graph->lock);
-
-        free_routing_table(table);
-
-        pthread_mutex_unlock(&graph->lock);
-}
-
-static int graph_routing_table_simple(struct graph *     graph,
-                                      uint64_t           s_addr,
-                                      struct list_head * table,
-                                      int **             dist)
-{
-        struct vertex **       nhops;
-        struct list_head *     p;
-        int                    i = 0;
-        struct vertex *        v;
-        struct routing_table * t;
-        struct nhop *          n;
-
-        assert(graph);
-        assert(table);
-        assert(dist);
-
-        /* We need at least 2 vertices for a table */
-        if (graph->nr_vertices < 2)
-                goto fail_vertices;
-
-        if (dijkstra(graph, s_addr, &nhops, dist))
-                goto fail_vertices;
-
-        list_head_init(table);
-
-        /* Now construct the routing table from the nhops. */
-        list_for_each(p, &graph->vertices) {
-                v = list_entry(p, struct vertex, next);
-
-                /* This is the src */
-                if (nhops[i] == NULL) {
-                        i++;
-                        continue;
-                }
-
-                t = malloc(sizeof(*t));
-                if (t == NULL)
-                        goto fail_t;
-
-                list_head_init(&t->nhops);
-
-                n = malloc(sizeof(*n));
-                if (n == NULL)
-                        goto fail_n;
-
-                t->dst = v->addr;
-                n->nhop = nhops[i]->addr;
-
-                list_add(&n->next, &t->nhops);
-                list_add(&t->next, table);
-
-                i++;
-        }
-
-        free(nhops);
-
-        return 0;
-
- fail_n:
-        free(t);
- fail_t:
-        free_routing_table(table);
-        free(nhops);
-        free(*dist);
- fail_vertices:
-        *dist = NULL;
-        return -1;
-}
-
-static int add_lfa_to_table(struct list_head * table,
-                            uint64_t           addr,
-                            uint64_t           lfa)
-{
-        struct list_head * p;
-        struct nhop *      n;
-
-        assert(table);
-
-        n = malloc(sizeof(*n));
-        if (n == NULL)
-                return -1;
-
-        n->nhop = lfa;
-
-        list_for_each(p, table) {
-                struct routing_table * t =
-                        list_entry(p, struct routing_table, next);
-                if (t->dst == addr) {
-                        list_add_tail(&n->next, &t->nhops);
-                        return 0;
-                }
-        }
-
-        free(n);
-
-        return -1;
-}
-
-static int graph_routing_table_lfa(struct graph *     graph,
-                                   uint64_t           s_addr,
-                                   struct list_head * table,
-                                   int **             dist)
-{
-        int *              n_dist[PROG_MAX_FLOWS];
-        uint64_t           addrs[PROG_MAX_FLOWS];
-        int                n_index[PROG_MAX_FLOWS];
-        struct list_head * p;
-        struct list_head * q;
-        struct vertex *    v;
-        struct edge *      e;
-        struct vertex **   nhops;
-        int                i = 0;
-        int                j;
-        int                k;
-
-        if (graph_routing_table_simple(graph, s_addr, table, dist))
-                goto fail_table;
-
-        for (j = 0; j < PROG_MAX_FLOWS; j++) {
-                n_dist[j] = NULL;
-                n_index[j] = -1;
-                addrs[j] = -1;
-        }
-
-        list_for_each(p, &graph->vertices) {
-                v = list_entry(p, struct vertex, next);
-
-                if (v->addr != s_addr)
-                        continue;
-
-                /*
-                 * Get the distances for every neighbor
-                 * of the source.
-                 */
-                list_for_each(q, &v->edges) {
-                        e = list_entry(q, struct edge, next);
-
-                        addrs[i] = e->nb->addr;
-                        n_index[i] = e->nb->index;
-                        if (dijkstra(graph, e->nb->addr,
-                                     &nhops, &(n_dist[i++])))
-                                goto fail_dijkstra;
-
-                        free(nhops);
-                }
-
-                break;
-        }
-
-        /* Loop though all nodes to see if we have a LFA for them. */
-        list_for_each(p, &graph->vertices) {
-                v = list_entry(p, struct vertex, next);
-
-                if (v->addr == s_addr)
-                        continue;
-
-                /*
-                 * Check for every neighbor if
-                 * dist(neighbor, destination) <
-                 * dist(neighbor, source) + dist(source, destination).
-                 */
-                for (j = 0; j < i; j++) {
-                        /* Exclude ourselves. */
-                        if (addrs[j] == v->addr)
-                                continue;
-
-                        if (n_dist[j][v->index] <
-                            (*dist)[n_index[j]] + (*dist)[v->index])
-                                if (add_lfa_to_table(table, v->addr,
-                                                     addrs[j]))
-                                        goto fail_add_lfa;
-                }
-        }
-
-        for (j = 0; j < i; j++)
-                free(n_dist[j]);
-
-        return 0;
-
- fail_add_lfa:
-        for (k = j; k < i; k++)
-                free(n_dist[k]);
- fail_dijkstra:
-        free_routing_table(table);
- fail_table:
-        return -1;
-}
-
-static int graph_routing_table_ecmp(struct graph *     graph,
-                                    uint64_t           s_addr,
-                                    struct list_head * table,
-                                    int **             dist)
-{
-        struct vertex **       nhops;
-        struct list_head *     p;
-        struct list_head *     h;
-        size_t                 i;
-        struct vertex *        v;
-        struct vertex *        src_v;
-        struct edge *          e;
-        struct routing_table * t;
-        struct nhop *          n;
-        struct list_head *     forwarding;
-
-        assert(graph);
-        assert(dist);
-
-        if (graph-> nr_vertices < 2)
-                goto fail_vertices;
-
-        forwarding = malloc(sizeof(*forwarding) * graph->nr_vertices);
-        if (forwarding == NULL)
-                goto fail_vertices;
-
-        for (i = 0; i < graph->nr_vertices; ++i)
-                list_head_init(&forwarding[i]);
-
-        if (dijkstra(graph, s_addr, &nhops, dist))
-                goto fail_dijkstra;
-
-        free(nhops);
-
-        src_v = find_vertex_by_addr(graph, s_addr);
-        if (src_v == NULL)
-                goto fail_src_v;
-
-        list_for_each(p, &src_v->edges) {
-                int * tmp_dist;
-
-                e = list_entry(p, struct edge, next);
-                if (dijkstra(graph, e->nb->addr, &nhops, &tmp_dist))
-                        goto fail_src_v;
-
-                free(nhops);
-
-                list_for_each(h, &graph->vertices) {
-                        v = list_entry(h, struct vertex, next);
-                        if (tmp_dist[v->index] + 1 == (*dist)[v->index]) {
-                                n = malloc(sizeof(*n));
-                                if (n == NULL) {
-                                        free(tmp_dist);
-                                        goto fail_src_v;
-                                }
-                                n->nhop = e->nb->addr;
-                                list_add_tail(&n->next, &forwarding[v->index]);
-                        }
-                }
-
-                free(tmp_dist);
-        }
-
-        list_head_init(table);
-        i = 0;
-        list_for_each(p, &graph->vertices) {
-                v = list_entry(p, struct vertex, next);
-                if (v->addr == s_addr) {
-                        ++i;
-                        continue;
-                }
-
-                t = malloc(sizeof(*t));
-                if (t == NULL)
-                        goto fail_t;
-
-                t->dst = v->addr;
-
-                list_head_init(&t->nhops);
-                if (&forwarding[i] != forwarding[i].nxt) {
-                        t->nhops.nxt = forwarding[i].nxt;
-                        t->nhops.prv = forwarding[i].prv;
-                        forwarding[i].prv->nxt = &t->nhops;
-                        forwarding[i].nxt->prv = &t->nhops;
-                }
-
-                list_add(&t->next, table);
-                ++i;
-        }
-
-        free(*dist);
-        *dist = NULL;
-        free(forwarding);
-
-        return 0;
-
- fail_t:
-        free_routing_table(table);
- fail_src_v:
-        free(*dist);
- fail_dijkstra:
-        free(forwarding);
- fail_vertices:
-        *dist = NULL;
-        return -1;
-}
-
-int graph_routing_table(struct graph *     graph,
-                        enum routing_algo  algo,
-                        uint64_t           s_addr,
-                        struct list_head * table)
-{
-        int * s_dist;
-
-        assert(graph);
-        assert(table);
-
-        pthread_mutex_lock(&graph->lock);
-
-        switch (algo) {
-        case ROUTING_SIMPLE:
-                /* LFA uses the s_dist this returns. */
-                if (graph_routing_table_simple(graph, s_addr, table, &s_dist))
-                        goto fail_table;
-                break;
-        case ROUTING_LFA:
-                if (graph_routing_table_lfa(graph, s_addr, table, &s_dist))
-                        goto fail_table;
-                break;
-
-        case ROUTING_ECMP:
-                if (graph_routing_table_ecmp(graph, s_addr, table, &s_dist))
-                        goto fail_table;
-                break;
-        default:
-                log_err("Unsupported algorithm.");
-                goto fail_table;
-        }
-
-        pthread_mutex_unlock(&graph->lock);
-
-        free(s_dist);
-
-        return 0;
-
- fail_table:
-        pthread_mutex_unlock(&graph->lock);
-        return -1;
-}