/* * Ouroboros - Copyright (C) 2016 - 2017 * * Data Transfer AE * * 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/. */ #define _POSIX_C_SOURCE 200112L #include "config.h" #define OUROBOROS_PREFIX "dt-ae" #include <ouroboros/bitmap.h> #include <ouroboros/errno.h> #include <ouroboros/logs.h> #include <ouroboros/rib.h> #include <ouroboros/dev.h> #include "connmgr.h" #include "ipcp.h" #include "dt.h" #include "dt_pci.h" #include "pff.h" #include "neighbors.h" #include "routing.h" #include "sdu_sched.h" #include "ae.h" #include "ribconfig.h" #include "fa.h" #include <stdlib.h> #include <stdbool.h> #include <pthread.h> #include <string.h> #include <inttypes.h> #include <assert.h> struct ae_info { void (* post_sdu)(void * ae, struct shm_du_buff * sdb); void * ae; }; struct { struct sdu_sched * sdu_sched; struct pff * pff[QOS_CUBE_MAX]; struct routing_i * routing[QOS_CUBE_MAX]; struct bmp * res_fds; struct ae_info aes[AP_RES_FDS]; pthread_rwlock_t lock; struct nbs * nbs; struct nb_notifier nb_notifier; pthread_t listener; } dt; static int dt_neighbor_event(enum nb_event event, struct conn conn) { /* We are only interested in neighbors being added and removed. */ switch (event) { case NEIGHBOR_ADDED: sdu_sched_add(dt.sdu_sched, conn.flow_info.fd); log_dbg("Added fd %d to SDU scheduler.", conn.flow_info.fd); break; case NEIGHBOR_REMOVED: sdu_sched_del(dt.sdu_sched, conn.flow_info.fd); log_dbg("Removed fd %d from SDU scheduler.", conn.flow_info.fd); break; default: break; } return 0; } static int sdu_handler(int fd, qoscube_t qc, struct shm_du_buff * sdb) { struct dt_pci dt_pci; memset(&dt_pci, 0, sizeof(dt_pci)); dt_pci_des(sdb, &dt_pci); if (dt_pci.dst_addr != ipcpi.dt_addr) { if (dt_pci.ttl == 0) { log_dbg("TTL was zero."); ipcp_sdb_release(sdb); return 0; } fd = pff_nhop(dt.pff[qc], dt_pci.dst_addr); if (fd < 0) { log_err("No next hop for %" PRIu64, dt_pci.dst_addr); ipcp_sdb_release(sdb); return -1; } if (ipcp_flow_write(fd, sdb)) { log_err("Failed to write SDU to fd %d.", fd); ipcp_sdb_release(sdb); return -1; } } else { dt_pci_shrink(sdb); if (dt_pci.fd > AP_RES_FDS) { if (ipcp_flow_write(dt_pci.fd, sdb)) { ipcp_sdb_release(sdb); return -1; } return 0; } if (dt.aes[dt_pci.fd].post_sdu == NULL) { log_err("No registered AE on fd %d.", dt_pci.fd); ipcp_sdb_release(sdb); return -EPERM; } dt.aes[dt_pci.fd].post_sdu(dt.aes[dt_pci.fd].ae, sdb); return 0; } /* silence compiler */ return 0; } static void * dt_conn_handle(void * o) { struct conn conn; (void) o; while (true) { if (connmgr_wait(AEID_DT, &conn)) { log_err("Failed to get next DT connection."); continue; } log_dbg("Got new connection."); /* NOTE: connection acceptance policy could be here. */ nbs_add(dt.nbs, conn); } return 0; } int dt_init(enum pol_routing pr, uint8_t addr_size, uint8_t fd_size, bool has_ttl) { int i; int j; struct conn_info info; memset(&info, 0, sizeof(info)); strcpy(info.ae_name, DT_AE); strcpy(info.protocol, DT_PROTO); info.pref_version = 1; info.pref_syntax = PROTO_FIXED; info.addr = ipcpi.dt_addr; if (dt_pci_init(addr_size, fd_size, has_ttl)) { log_err("Failed to init shm dt_pci."); goto fail_pci_init; } dt.nbs = nbs_create(); if (dt.nbs == NULL) { log_err("Failed to create neighbors struct."); goto fail_nbs; } dt.nb_notifier.notify_call = dt_neighbor_event; if (nbs_reg_notifier(dt.nbs, &dt.nb_notifier)) { log_err("Failed to register notifier."); goto fail_nbs_notifier; } if (connmgr_ae_init(AEID_DT, &info, dt.nbs)) { log_err("Failed to register with connmgr."); goto fail_connmgr_ae_init; } if (routing_init(pr, dt.nbs)) { log_err("Failed to init routing."); goto fail_routing; } for (i = 0; i < QOS_CUBE_MAX; ++i) { dt.pff[i] = pff_create(); if (dt.pff[i] == NULL) { for (j = 0; j < i; ++j) pff_destroy(dt.pff[j]); goto fail_pff; } } for (i = 0; i < QOS_CUBE_MAX; ++i) { dt.routing[i] = routing_i_create(dt.pff[i]); if (dt.routing[i] == NULL) { for (j = 0; j < i; ++j) routing_i_destroy(dt.routing[j]); goto fail_routing_i; } } if (pthread_rwlock_init(&dt.lock, NULL)) { log_err("Failed to init rwlock."); goto fail_rwlock_init; } dt.res_fds = bmp_create(AP_RES_FDS, 0); if (dt.res_fds == NULL) goto fail_res_fds; return 0; fail_res_fds: pthread_rwlock_destroy(&dt.lock); fail_rwlock_init: for (j = 0; j < QOS_CUBE_MAX; ++j) routing_i_destroy(dt.routing[j]); fail_routing_i: connmgr_ae_fini(AEID_DT); fail_connmgr_ae_init: for (i = 0; i < QOS_CUBE_MAX; ++i) pff_destroy(dt.pff[i]); fail_pff: routing_fini(); fail_routing: nbs_unreg_notifier(dt.nbs, &dt.nb_notifier); fail_nbs_notifier: nbs_destroy(dt.nbs); fail_nbs: dt_pci_fini(); fail_pci_init: connmgr_ae_fini(AEID_DT); return -1; } void dt_fini(void) { int i; bmp_destroy(dt.res_fds); pthread_rwlock_destroy(&dt.lock); for (i = 0; i < QOS_CUBE_MAX; ++i) routing_i_destroy(dt.routing[i]); for (i = 0; i < QOS_CUBE_MAX; ++i) pff_destroy(dt.pff[i]); routing_fini(); nbs_unreg_notifier(dt.nbs, &dt.nb_notifier); nbs_destroy(dt.nbs); connmgr_ae_fini(AEID_DT); } int dt_start(void) { dt.sdu_sched = sdu_sched_create(sdu_handler); if (dt.sdu_sched == NULL) { log_err("Failed to create N-1 SDU scheduler."); return -1; } if (pthread_create(&dt.listener, NULL, dt_conn_handle, NULL)) { log_err("Failed to create listener thread."); sdu_sched_destroy(dt.sdu_sched); return -1; } return 0; } void dt_stop(void) { pthread_cancel(dt.listener); pthread_join(dt.listener, NULL); sdu_sched_destroy(dt.sdu_sched); } int dt_reg_ae(void * ae, void (* func)(void * func, struct shm_du_buff *)) { int res_fd; assert(func); pthread_rwlock_wrlock(&dt.lock); res_fd = bmp_allocate(dt.res_fds); if (!bmp_is_id_valid(dt.res_fds, res_fd)) { log_warn("Reserved fds depleted."); pthread_rwlock_unlock(&dt.lock); return -EBADF; } assert(dt.aes[res_fd].post_sdu == NULL); assert(dt.aes[res_fd].ae == NULL); dt.aes[res_fd].post_sdu = func; dt.aes[res_fd].ae = ae; pthread_rwlock_unlock(&dt.lock); return res_fd; } int dt_write_sdu(uint64_t dst_addr, qoscube_t qc, int np1_fd, struct shm_du_buff * sdb) { int fd; struct dt_pci dt_pci; assert(sdb); assert(dst_addr != ipcpi.dt_addr); fd = pff_nhop(dt.pff[qc], dst_addr); if (fd < 0) { log_dbg("Could not get nhop for addr %" PRIu64 ".", dst_addr); return -1; } dt_pci.dst_addr = dst_addr; dt_pci.qc = qc; dt_pci.fd = np1_fd; if (dt_pci_ser(sdb, &dt_pci)) { log_err("Failed to serialize PDU."); return -1; } if (ipcp_flow_write(fd, sdb)) { log_err("Failed to write SDU to fd %d.", fd); return -1; } return 0; }