/* * Ouroboros - Copyright (C) 2016 - 2017 * * Data transfer neighbors * * 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 "neighbors" #include <ouroboros/config.h> #include <ouroboros/shared.h> #include <ouroboros/ipcp-dev.h> #include <ouroboros/errno.h> #include <ouroboros/logs.h> #include "neighbors.h" #include <stdlib.h> #include <assert.h> #include <inttypes.h> static void notify_listeners(enum nb_event event, struct nb * nb, struct nbs * nbs) { struct list_head * p = NULL; pthread_mutex_lock(&nbs->notifiers_lock); list_for_each(p, &nbs->notifiers) { struct nb_notifier * e = list_entry(p, struct nb_notifier, next); if (e->notify_call(event, nb->conn)) log_err("Listener reported an error."); } pthread_mutex_unlock(&nbs->notifiers_lock); } struct nbs * nbs_create(void) { struct nbs * nbs; nbs = malloc(sizeof(*nbs)); if (nbs == NULL) return NULL; list_head_init(&nbs->list); list_head_init(&nbs->notifiers); if (pthread_mutex_init(&nbs->list_lock, NULL)) return NULL; if (pthread_mutex_init(&nbs->notifiers_lock, NULL)) { pthread_mutex_destroy(&nbs->list_lock); return NULL; } return nbs; } void nbs_destroy(struct nbs * nbs) { struct list_head * p = NULL; struct list_head * n = NULL; assert(nbs); pthread_mutex_lock(&nbs->list_lock); list_for_each_safe(p, n, &nbs->list) { struct nb * e = list_entry(p, struct nb, next); list_del(&e->next); free(e); } pthread_mutex_unlock(&nbs->list_lock); pthread_mutex_destroy(&nbs->list_lock); pthread_mutex_destroy(&nbs->notifiers_lock); free(nbs); } int nbs_add(struct nbs * nbs, struct conn conn) { struct nb * nb; assert(nbs); nb = malloc(sizeof(*nb)); if (nb == NULL) return -ENOMEM; nb->conn = conn; pthread_mutex_lock(&nbs->list_lock); list_add(&nb->next, &nbs->list); notify_listeners(NEIGHBOR_ADDED, nb, nbs); pthread_mutex_unlock(&nbs->list_lock); log_info("Added neighbor with fd %d and address %" PRIu64 " to list.", conn.flow_info.fd, conn.conn_info.addr); return 0; } int nbs_update_qos(struct nbs * nbs, int fd, qosspec_t qs) { struct list_head * p = NULL; assert(nbs); pthread_mutex_lock(&nbs->list_lock); list_for_each(p, &nbs->list) { struct nb * e = list_entry(p, struct nb, next); if (e->conn.flow_info.fd == fd) { e->conn.flow_info.qs = qs; notify_listeners(NEIGHBOR_QOS_CHANGE, e, nbs); pthread_mutex_unlock(&nbs->list_lock); return 0; } } pthread_mutex_unlock(&nbs->list_lock); return -1; } int nbs_del(struct nbs * nbs, int fd) { struct list_head * p = NULL; struct list_head * n = NULL; assert(nbs); pthread_mutex_lock(&nbs->list_lock); list_for_each_safe(p, n, &nbs->list) { struct nb * e = list_entry(p, struct nb, next); if (e->conn.flow_info.fd == fd) { notify_listeners(NEIGHBOR_REMOVED, e, nbs); list_del(&e->next); free(e); pthread_mutex_unlock(&nbs->list_lock); return 0; } } pthread_mutex_unlock(&nbs->list_lock); return -1; } int nbs_reg_notifier(struct nbs * nbs, struct nb_notifier * notify) { assert(nbs); assert(notify); pthread_mutex_lock(&nbs->notifiers_lock); list_add(¬ify->next, &nbs->notifiers); pthread_mutex_unlock(&nbs->notifiers_lock); return 0; } int nbs_unreg_notifier(struct nbs * nbs, struct nb_notifier * notify) { struct list_head * p = NULL; struct list_head * n = NULL; pthread_mutex_lock(&nbs->notifiers_lock); list_for_each_safe(p, n, &nbs->notifiers) { struct nb_notifier * e = list_entry(p, struct nb_notifier, next); if (e == notify) { list_del(&e->next); pthread_mutex_unlock(&nbs->notifiers_lock); return 0; } } pthread_mutex_unlock(&nbs->notifiers_lock); return -1; }