build: Move connmgr and enrolment to common ground

The connection manager and enrolment components of the unicast and
broadcast IPCP have a lot in common, as conjectured in the paper. The
initial implementation of the broadcast IPCP just duplicated the
code. This moves the shared functionality to common ground.

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

21 files changed, 944 insertions, 1890 deletions

diff --git a/src/ipcpd/broadcast/comp.h b/src/ipcpd/broadcast/comp.h
deleted file mode 100644
index 6cb42847..00000000
--- a/src/ipcpd/broadcast/comp.h
+++ /dev/null
@@ -1,45 +0,0 @@
-/*
- * Ouroboros - Copyright (C) 2016 - 2021
- *
- * Components for the broadcast IPC process
- *
- *    Dimitri Staessens <dimitri@ouroboros.rocks>
- *    Sander Vrijders   <sander@ouroboros.rocks>
- *
- * 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/.
- */
-
-#ifndef OUROBOROS_IPCPD_BROADCAST_COMP_H
-#define OUROBOROS_IPCPD_BROADCAST_COMP_H
-
-#include <ouroboros/cacep.h>
-
-#define DST_MAX_STRLEN 64
-
-enum comp_id {
-        COMPID_DT = 0,
-        COMPID_ENROLL,
-        COMPID_MAX
-};
-
-struct conn {
-        struct conn_info conn_info;
-        struct {
-                char      dst[DST_MAX_STRLEN + 1];
-                int       fd;
-                qosspec_t qs;
-        } flow_info;
-};
-
-#endif /* OUROBOROS_IPCPD_BROADCAST_COMP_H */
diff --git a/src/ipcpd/broadcast/connmgr.c b/src/ipcpd/broadcast/connmgr.c
index 1311a916..b65f48b0 100644
--- a/src/ipcpd/broadcast/connmgr.c
+++ b/src/ipcpd/broadcast/connmgr.c
@@ -20,496 +20,16 @@
  * Foundation, Inc., http://www.fsf.org/about/contact/.
  */
 
+#include "config.h"
+
 #if defined(__linux__) || defined(__CYGWIN__)
 #define _DEFAULT_SOURCE
 #else
 #define _POSIX_C_SOURCE 200112L
 #endif
 
-#define OUROBOROS_PREFIX "connection-manager"
-
-#include <ouroboros/dev.h>
-#include <ouroboros/cacep.h>
-#include <ouroboros/errno.h>
-#include <ouroboros/list.h>
-#include <ouroboros/logs.h>
-#include <ouroboros/notifier.h>
-
-#include "comp.h"
-#include "connmgr.h"
-#include "enroll.h"
-#include "ipcp.h"
-
-#include <pthread.h>
-#include <string.h>
-#include <stdlib.h>
-#include <assert.h>
-
-enum connmgr_state {
-        CONNMGR_NULL = 0,
-        CONNMGR_INIT,
-        CONNMGR_RUNNING
-};
-
-struct conn_el {
-        struct list_head next;
-        struct conn      conn;
-};
-
-struct comp {
-        struct conn_info info;
-
-        struct list_head conns;
-        struct list_head pending;
-
-        pthread_cond_t   cond;
-        pthread_mutex_t  lock;
-};
-
-struct {
-        struct comp        comps[COMPID_MAX];
-        enum connmgr_state state;
-
-        pthread_t          acceptor;
-} connmgr;
-
-static int get_id_by_name(const char * name)
-{
-        enum comp_id i;
-
-        for (i = 0; i < COMPID_MAX; ++i)
-                if (strcmp(name, connmgr.comps[i].info.comp_name) == 0)
-                        return i;
-
-        return -1;
-}
-
-static int get_conn_by_fd(int           fd,
-                          enum comp_id  id,
-                          struct conn * conn)
-{
-        struct list_head * p;
-
-        pthread_mutex_lock(&connmgr.comps[id].lock);
-
-        list_for_each(p, &connmgr.comps[id].conns) {
-                struct conn_el * c =
-                        list_entry(p, struct conn_el, next);
-                if (c->conn.flow_info.fd == fd) {
-                        *conn = c->conn;
-                        pthread_mutex_unlock(&connmgr.comps[id].lock);
-                        return 0;
-                }
-        }
-
-        pthread_mutex_unlock(&connmgr.comps[id].lock);
-
-        return -1;
-}
-
-static int add_comp_conn(enum comp_id       id,
-                         int                fd,
-                         qosspec_t          qs,
-                         struct conn_info * rcv_info)
-{
-        struct conn_el * el;
-
-        el = malloc(sizeof(*el));
-        if (el == NULL) {
-                log_err("Not enough memory.");
-                return -1;
-        }
-
-        el->conn.conn_info    = *rcv_info;
-        el->conn.flow_info.fd = fd;
-        el->conn.flow_info.qs = qs;
-
-        pthread_mutex_lock(&connmgr.comps[id].lock);
-
-        list_add(&el->next, &connmgr.comps[id].pending);
-        pthread_cond_signal(&connmgr.comps[id].cond);
-
-        pthread_mutex_unlock(&connmgr.comps[id].lock);
-
-        return 0;
-}
-
-static void * flow_acceptor(void * o)
-{
-        int               fd;
-        qosspec_t         qs;
-        struct conn_info  rcv_info;
-        struct conn_info  fail_info;
-
-        (void) o;
-
-        memset(&fail_info, 0, sizeof(fail_info));
-
-        while (true) {
-                int id;
-
-                fd = flow_accept(&qs, NULL);
-                if (fd < 0) {
-                        if (fd != -EIRMD)
-                                log_warn("Flow accept failed: %d", fd);
-                        continue;
-                }
-
-                if (cacep_rcv(fd, &rcv_info)) {
-                        log_dbg("Error establishing application connection.");
-                        flow_dealloc(fd);
-                        continue;
-                }
-
-                id = get_id_by_name(rcv_info.comp_name);
-                if (id < 0) {
-                        log_dbg("Connection request for unknown component %s.",
-                                rcv_info.comp_name);
-                        cacep_snd(fd, &fail_info);
-                        flow_dealloc(fd);
-                        continue;
-                }
-
-                assert(id < COMPID_MAX);
-
-                if (cacep_snd(fd, &connmgr.comps[id].info)) {
-                        log_dbg("Failed to respond to request.");
-                        flow_dealloc(fd);
-                        continue;
-                }
-
-                if (add_comp_conn(id, fd, qs, &rcv_info)) {
-                        log_dbg("Failed to add new connection.");
-                        flow_dealloc(fd);
-                        continue;
-                }
-        }
-
-        return (void *) 0;
-}
-
-static void handle_event(void *       self,
-                         int          event,
-                         const void * o)
-{
-        struct conn conn;
-
-        (void) self;
-
-        if (!(event == NOTIFY_DT_FLOW_UP ||
-              event == NOTIFY_DT_FLOW_DOWN ||
-              event == NOTIFY_DT_FLOW_DEALLOC))
-                return;
-
-        if (get_conn_by_fd(*((int *) o), COMPID_DT, &conn))
-                return;
-
-        switch (event) {
-        case NOTIFY_DT_FLOW_UP:
-                notifier_event(NOTIFY_DT_CONN_UP, &conn);
-                break;
-        case NOTIFY_DT_FLOW_DOWN:
-                notifier_event(NOTIFY_DT_CONN_DOWN, &conn);
-                break;
-        case NOTIFY_DT_FLOW_DEALLOC:
-                notifier_event(NOTIFY_DT_CONN_DEL, &conn);
-                break;
-        default:
-                break;
-        }
-}
-
-int connmgr_init(void)
-{
-        connmgr.state = CONNMGR_INIT;
-
-        if (notifier_reg(handle_event, NULL))
-                return -1;
-
-        return 0;
-}
-
-void connmgr_fini(void)
-{
-        int i;
-
-        notifier_unreg(handle_event);
-
-        if (connmgr.state == CONNMGR_RUNNING)
-                pthread_join(connmgr.acceptor, NULL);
-
-        for (i = 0; i < COMPID_MAX; ++i)
-                connmgr_comp_fini(i);
-}
-
-int connmgr_start(void)
-{
-        if (pthread_create(&connmgr.acceptor, NULL, flow_acceptor, NULL))
-                return -1;
-
-        connmgr.state = CONNMGR_RUNNING;
-
-        return 0;
-}
-
-void connmgr_stop(void)
-{
-        if (connmgr.state == CONNMGR_RUNNING)
-                pthread_cancel(connmgr.acceptor);
-}
-
-int connmgr_comp_init(enum comp_id             id,
-                      const struct conn_info * info)
-{
-        struct comp * comp;
-
-        assert(id >= 0 && id < COMPID_MAX);
-
-        comp = connmgr.comps + id;
-
-        if (pthread_mutex_init(&comp->lock, NULL))
-                return -1;
-
-        if (pthread_cond_init(&comp->cond, NULL)) {
-                pthread_mutex_destroy(&comp->lock);
-                return -1;
-        }
-
-        list_head_init(&comp->conns);
-        list_head_init(&comp->pending);
-
-        memcpy(&connmgr.comps[id].info, info, sizeof(connmgr.comps[id].info));
-
-        return 0;
-}
-
-void connmgr_comp_fini(enum comp_id id)
-{
-        struct list_head * p;
-        struct list_head * h;
-        struct comp *      comp;
-
-        assert(id >= 0 && id < COMPID_MAX);
-
-        if (strlen(connmgr.comps[id].info.comp_name) == 0)
-                return;
-
-        comp = connmgr.comps + id;
-
-        pthread_mutex_lock(&comp->lock);
-
-        list_for_each_safe(p, h, &comp->conns) {
-                struct conn_el * e = list_entry(p, struct conn_el, next);
-                list_del(&e->next);
-                free(e);
-        }
-
-        list_for_each_safe(p, h, &comp->pending) {
-                struct conn_el * e = list_entry(p, struct conn_el, next);
-                list_del(&e->next);
-                free(e);
-        }
-
-        pthread_mutex_unlock(&comp->lock);
-
-        pthread_cond_destroy(&comp->cond);
-        pthread_mutex_destroy(&comp->lock);
-
-        memset(&connmgr.comps[id].info, 0, sizeof(connmgr.comps[id].info));
-}
-
-int connmgr_ipcp_connect(const char * dst,
-                         const char * component,
-                         qosspec_t    qs)
-{
-        struct conn_el * ce;
-        int              id;
-
-        assert(dst);
-        assert(component);
-
-        ce = malloc(sizeof(*ce));
-        if (ce == NULL) {
-                log_dbg("Out of memory.");
-                return -1;
-        }
-
-        id = get_id_by_name(component);
-        if (id < 0) {
-                log_dbg("No such component: %s", component);
-                free(ce);
-                return -1;
-        }
-
-        if (connmgr_alloc(id, dst, &qs, &ce->conn)) {
-                free(ce);
-                return -1;
-        }
-
-        if (strlen(dst) > DST_MAX_STRLEN) {
-                log_warn("Truncating dst length for connection.");
-                memcpy(ce->conn.flow_info.dst, dst, DST_MAX_STRLEN);
-                ce->conn.flow_info.dst[DST_MAX_STRLEN] = '\0';
-        } else {
-                strcpy(ce->conn.flow_info.dst, dst);
-        }
-
-        pthread_mutex_lock(&connmgr.comps[id].lock);
-
-        list_add(&ce->next, &connmgr.comps[id].conns);
-
-        pthread_mutex_unlock(&connmgr.comps[id].lock);
-
-        return 0;
-}
-
-int connmgr_ipcp_disconnect(const char * dst,
-                            const char * component)
-{
-        struct list_head * p;
-        struct list_head * h;
-        int                id;
-
-        assert(dst);
-        assert(component);
-
-        id = get_id_by_name(component);
-        if (id < 0)
-                return -1;
-
-        pthread_mutex_lock(&connmgr.comps[id].lock);
-
-        list_for_each_safe(p,h, &connmgr.comps[id].conns) {
-                struct conn_el * el = list_entry(p, struct conn_el, next);
-                if (strcmp(el->conn.flow_info.dst, dst) == 0) {
-                        int ret;
-                        pthread_mutex_unlock(&connmgr.comps[id].lock);
-                        list_del(&el->next);
-                        ret = connmgr_dealloc(id, &el->conn);
-                        free(el);
-                        return ret;
-                }
-        }
-
-        pthread_mutex_unlock(&connmgr.comps[id].lock);
-
-        return 0;
-}
-
-int connmgr_alloc(enum comp_id  id,
-                  const char *  dst,
-                  qosspec_t *   qs,
-                  struct conn * conn)
-{
-        assert(id >= 0 && id < COMPID_MAX);
-        assert(dst);
-
-        conn->flow_info.fd = flow_alloc(dst, qs, NULL);
-        if (conn->flow_info.fd < 0) {
-                log_dbg("Failed to allocate flow to %s.", dst);
-                return -1;
-        }
-
-        if (qs != NULL)
-                conn->flow_info.qs = *qs;
-        else
-                memset(&conn->flow_info.qs, 0, sizeof(conn->flow_info.qs));
-
-        log_dbg("Sending cacep info for protocol %s to fd %d.",
-                connmgr.comps[id].info.protocol, conn->flow_info.fd);
-
-        if (cacep_snd(conn->flow_info.fd, &connmgr.comps[id].info)) {
-                log_dbg("Failed to create application connection.");
-                flow_dealloc(conn->flow_info.fd);
-                return -1;
-        }
-
-        if (cacep_rcv(conn->flow_info.fd, &conn->conn_info)) {
-                log_dbg("Failed to connect to application.");
-                flow_dealloc(conn->flow_info.fd);
-                return -1;
-        }
-
-        if (strcmp(connmgr.comps[id].info.protocol, conn->conn_info.protocol)) {
-                log_dbg("Unknown protocol (requested %s, got %s).",
-                        connmgr.comps[id].info.protocol,
-                        conn->conn_info.protocol);
-                flow_dealloc(conn->flow_info.fd);
-                return -1;
-        }
-
-        if (connmgr.comps[id].info.pref_version !=
-            conn->conn_info.pref_version) {
-                log_dbg("Unknown protocol version.");
-                flow_dealloc(conn->flow_info.fd);
-                return -1;
-        }
-
-        if (connmgr.comps[id].info.pref_syntax != conn->conn_info.pref_syntax) {
-                log_dbg("Unknown protocol syntax.");
-                flow_dealloc(conn->flow_info.fd);
-                return -1;
-        }
-
-        switch (id) {
-        case COMPID_DT:
-                notifier_event(NOTIFY_DT_CONN_ADD, conn);
-                break;
-        default:
-                break;
-        }
-
-        return 0;
-}
-
-int connmgr_dealloc(enum comp_id  id,
-                    struct conn * conn)
-{
-        switch (id) {
-        case COMPID_DT:
-                notifier_event(NOTIFY_DT_CONN_DEL, conn);
-                break;
-        default:
-                break;
-        }
-
-        return flow_dealloc(conn->flow_info.fd);
-}
-
-
-int connmgr_wait(enum comp_id  id,
-                 struct conn * conn)
-{
-        struct conn_el * el;
-        struct comp *    comp;
-
-        assert(id >= 0 && id < COMPID_MAX);
-        assert(conn);
-
-        comp = connmgr.comps + id;
-
-        pthread_mutex_lock(&comp->lock);
-
-        pthread_cleanup_push((void(*)(void *))pthread_mutex_unlock,
-                             (void *) &comp->lock);
-
-        while (list_is_empty(&comp->pending))
-                pthread_cond_wait(&comp->cond, &comp->lock);
-
-        pthread_cleanup_pop(false);
-
-        el = list_first_entry((&comp->pending), struct conn_el, next);
-        if (el == NULL) {
-                pthread_mutex_unlock(&comp->lock);
-                return -1;
-        }
-
-        *conn = el->conn;
-
-        list_del(&el->next);
-        list_add(&el->next, &connmgr.comps[id].conns);
+#include <ouroboros/ipcp.h>
 
-        pthread_mutex_unlock(&comp->lock);
+#define BUILD_IPCP_BROADCAST
 
-        return 0;
-}
+#include "common/connmgr.c"
diff --git a/src/ipcpd/broadcast/connmgr.h b/src/ipcpd/broadcast/connmgr.h
deleted file mode 100644
index 49ff61d8..00000000
--- a/src/ipcpd/broadcast/connmgr.h
+++ /dev/null
@@ -1,71 +0,0 @@
-/*
- * Ouroboros - Copyright (C) 2016 - 2021
- *
- * Handles the different AP connections
- *
- *    Dimitri Staessens <dimitri@ouroboros.rocks>
- *    Sander Vrijders   <sander@ouroboros.rocks>
- *
- * 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/.
- */
-
-#ifndef OUROBOROS_IPCPD_BROADCAST_CONNMGR_H
-#define OUROBOROS_IPCPD_BROADCAST_CONNMGR_H
-
-#include <ouroboros/cacep.h>
-#include <ouroboros/qos.h>
-
-#include "comp.h"
-
-#define NOTIFY_DT_CONN_ADD     0x00D0
-#define NOTIFY_DT_CONN_DEL     0x00D1
-#define NOTIFY_DT_CONN_QOS     0x00D2
-#define NOTIFY_DT_CONN_UP      0x00D3
-#define NOTIFY_DT_CONN_DOWN    0x00D4
-#define NOTIFY_DT_FLOW_UP      0x00D5
-#define NOTIFY_DT_FLOW_DOWN    0x00D6
-#define NOTIFY_DT_FLOW_DEALLOC 0x00D7
-
-int         connmgr_init(void);
-
-void        connmgr_fini(void);
-
-int         connmgr_start(void);
-
-void        connmgr_stop(void);
-
-int         connmgr_comp_init(enum comp_id             id,
-                              const struct conn_info * info);
-
-void        connmgr_comp_fini(enum comp_id id);
-
-int         connmgr_ipcp_connect(const char * dst,
-                                 const char * component,
-                                 qosspec_t    qs);
-
-int         connmgr_ipcp_disconnect(const char * dst,
-                                    const char * component);
-
-int         connmgr_alloc(enum comp_id  id,
-                          const char *  dst,
-                          qosspec_t *   qs,
-                          struct conn * conn);
-
-int         connmgr_dealloc(enum comp_id  id,
-                            struct conn * conn);
-
-int         connmgr_wait(enum comp_id  id,
-                         struct conn * conn);
-
-#endif /* OUROBOROS_IPCPD_BROADCAST_CONNMGR_H */
diff --git a/src/ipcpd/broadcast/dt.c b/src/ipcpd/broadcast/dt.c
index 77f6204d..c3f40909 100644
--- a/src/ipcpd/broadcast/dt.c
+++ b/src/ipcpd/broadcast/dt.c
@@ -42,8 +42,8 @@
 #include <ouroboros/notifier.h>
 #include <ouroboros/utils.h>
 
-#include "comp.h"
-#include "connmgr.h"
+#include "common/comp.h"
+#include "common/connmgr.h"
 #include "dt.h"
 #include "ipcp.h"
 
diff --git a/src/ipcpd/broadcast/enroll.c b/src/ipcpd/broadcast/enroll.c
index c05c6d8e..143f16d5 100644
--- a/src/ipcpd/broadcast/enroll.c
+++ b/src/ipcpd/broadcast/enroll.c
@@ -19,345 +19,6 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., http://www.fsf.org/about/contact/.
  */
+#define BUILD_IPCP_BROADCAST
 
-#if defined(__linux__) || defined(__CYGWIN__)
-#define _DEFAULT_SOURCE
-#else
-#define _POSIX_C_SOURCE 199309L
-#endif
-
-#define OUROBOROS_PREFIX "enrollment"
-
-#include <ouroboros/endian.h>
-#include <ouroboros/errno.h>
-#include <ouroboros/time_utils.h>
-#include <ouroboros/dev.h>
-#include <ouroboros/logs.h>
-#include <ouroboros/errno.h>
-#include <ouroboros/sockets.h>
-
-#include "connmgr.h"
-#include "enroll.h"
-#include "ipcp.h"
-
-#include <assert.h>
-#include <stdlib.h>
-#include <string.h>
-#include <pthread.h>
-
-#include "ipcp_config.pb-c.h"
-typedef EnrollMsg enroll_msg_t;
-
-#define ENROLL_COMP             "Enrollment"
-#define ENROLL_PROTO            "OEP" /* Ouroboros enrollment protocol */
-#define ENROLL_WARN_TIME_OFFSET 20
-#define ENROLL_BUF_LEN          1024
-
-enum enroll_state {
-        ENROLL_NULL = 0,
-        ENROLL_INIT,
-        ENROLL_RUNNING
-};
-
-struct {
-        struct ipcp_config conf;
-        enum enroll_state  state;
-        pthread_t          listener;
-} enroll;
-
-static int send_rcv_enroll_msg(int fd)
-{
-        enroll_msg_t    req = ENROLL_MSG__INIT;
-        enroll_msg_t *  reply;
-        uint8_t         buf[ENROLL_BUF_LEN];
-        ssize_t         len;
-        ssize_t         delta_t;
-        struct timespec t0;
-        struct timespec rtt;
-
-        req.code = ENROLL_CODE__ENROLL_REQ;
-
-        len = enroll_msg__get_packed_size(&req);
-        if (len < 0) {
-                log_dbg("Failed pack request message.");
-                return -1;
-        }
-
-        enroll_msg__pack(&req, buf);
-
-        clock_gettime(CLOCK_REALTIME, &t0);
-
-        if (flow_write(fd, buf, len) < 0) {
-                log_dbg("Failed to send request message.");
-                return -1;
-        }
-
-        len = flow_read(fd, buf, ENROLL_BUF_LEN);
-        if (len < 0) {
-                log_dbg("No enrollment reply received.");
-                return -1;
-        }
-
-        log_dbg("Received enrollment info (%zd bytes).", len);
-
-        reply = enroll_msg__unpack(NULL, len, buf);
-        if (reply == NULL) {
-                log_dbg("No enrollment response.");
-                return -1;
-        }
-
-        if (reply->code != ENROLL_CODE__ENROLL_BOOT) {
-                log_dbg("Failed to unpack enrollment response.");
-                enroll_msg__free_unpacked(reply, NULL);
-                return -1;
-        }
-
-        if (!(reply->has_t_sec && reply->has_t_nsec)) {
-                log_dbg("No time in response message.");
-                enroll_msg__free_unpacked(reply, NULL);
-                return -1;
-        }
-
-        clock_gettime(CLOCK_REALTIME, &rtt);
-
-        delta_t = ts_diff_ms(&t0, &rtt);
-
-        rtt.tv_sec  = reply->t_sec;
-        rtt.tv_nsec = reply->t_nsec;
-
-        if (labs(ts_diff_ms(&t0, &rtt)) - delta_t > ENROLL_WARN_TIME_OFFSET)
-                log_warn("Clock offset above threshold.");
-
-        strcpy(enroll.conf.layer_info.layer_name,
-               reply->conf->layer_info->layer_name);
-        enroll.conf.layer_info.dir_hash_algo
-                = reply->conf->layer_info->dir_hash_algo;
-
-        enroll_msg__free_unpacked(reply, NULL);
-
-        return 0;
-}
-
-static ssize_t enroll_pack(uint8_t ** buf)
-{
-        enroll_msg_t      msg        = ENROLL_MSG__INIT;
-        ipcp_config_msg_t config     = IPCP_CONFIG_MSG__INIT;
-        layer_info_msg_t  layer_info = LAYER_INFO_MSG__INIT;
-        struct timespec   now;
-        ssize_t           len;
-
-        clock_gettime(CLOCK_REALTIME, &now);
-
-        msg.code       = ENROLL_CODE__ENROLL_BOOT;
-        msg.has_t_sec  = true;
-        msg.t_sec      = now.tv_sec;
-        msg.has_t_nsec = true;
-        msg.t_nsec     = now.tv_nsec;
-        msg.conf       = &config;
-
-        config.ipcp_type  = enroll.conf.type;
-        config.layer_info = &layer_info;
-
-        layer_info.layer_name    = (char *) enroll.conf.layer_info.layer_name;
-        layer_info.dir_hash_algo = enroll.conf.layer_info.dir_hash_algo;
-
-        len = enroll_msg__get_packed_size(&msg);
-
-        *buf = malloc(len);
-        if (*buf == NULL)
-                return -1;
-
-        enroll_msg__pack(&msg, *buf);
-
-        return len;
-}
-
-static void * enroll_handle(void * o)
-{
-        struct conn    conn;
-        uint8_t        buf[ENROLL_BUF_LEN];
-        uint8_t *      reply;
-        ssize_t        len;
-        enroll_msg_t * msg;
-
-        (void) o;
-
-        while (true) {
-                if (connmgr_wait(COMPID_ENROLL, &conn)) {
-                        log_err("Failed to get next connection.");
-                        continue;
-                }
-
-                len = flow_read(conn.flow_info.fd, buf, ENROLL_BUF_LEN);
-                if (len < 0) {
-                        log_err("Failed to read from flow.");
-                        connmgr_dealloc(COMPID_ENROLL, &conn);
-                        continue;
-                }
-
-                msg = enroll_msg__unpack(NULL, len, buf);
-                if (msg == NULL) {
-                        log_err("Failed to unpack message.");
-                        connmgr_dealloc(COMPID_ENROLL, &conn);
-                        continue;
-                }
-
-                if (msg->code != ENROLL_CODE__ENROLL_REQ) {
-                        log_err("Wrong message type.");
-                        connmgr_dealloc(COMPID_ENROLL, &conn);
-                        enroll_msg__free_unpacked(msg, NULL);
-                        continue;
-                }
-
-                log_dbg("Enrolling a new neighbor.");
-
-                enroll_msg__free_unpacked(msg, NULL);
-
-                len = enroll_pack(&reply);
-                if (reply == NULL) {
-                        log_err("Failed to pack enrollment message.");
-                        connmgr_dealloc(COMPID_ENROLL, &conn);
-                        continue;
-                }
-
-                log_dbg("Sending enrollment info (%zd bytes).", len);
-
-                if (flow_write(conn.flow_info.fd, reply, len) < 0) {
-                        log_err("Failed respond to enrollment request.");
-                        connmgr_dealloc(COMPID_ENROLL, &conn);
-                        free(reply);
-                        continue;
-                }
-
-                free(reply);
-
-                len = flow_read(conn.flow_info.fd, buf, ENROLL_BUF_LEN);
-                if (len < 0) {
-                        log_err("Failed to read from flow.");
-                        connmgr_dealloc(COMPID_ENROLL, &conn);
-                        continue;
-                }
-
-                msg = enroll_msg__unpack(NULL, len, buf);
-                if (msg == NULL) {
-                        log_err("Failed to unpack message.");
-                        connmgr_dealloc(COMPID_ENROLL, &conn);
-                        continue;
-                }
-
-                if (msg->code != ENROLL_CODE__ENROLL_DONE || !msg->has_result) {
-                        log_err("Wrong message type.");
-                        enroll_msg__free_unpacked(msg, NULL);
-                        connmgr_dealloc(COMPID_ENROLL, &conn);
-                        continue;
-                }
-
-                if (msg->result == 0)
-                        log_dbg("Neighbor enrollment successful.");
-                else
-                        log_dbg("Neigbor reported failed enrollment.");
-
-                enroll_msg__free_unpacked(msg, NULL);
-
-                connmgr_dealloc(COMPID_ENROLL, &conn);
-        }
-
-        return 0;
-}
-
-int enroll_boot(struct conn * conn)
-{
-        log_dbg("Getting boot information.");
-
-        if (send_rcv_enroll_msg(conn->flow_info.fd)) {
-                log_err("Failed to enroll.");
-                return -1;
-        }
-
-        return 0;
-}
-
-int enroll_done(struct conn * conn,
-                int           result)
-{
-        enroll_msg_t msg = ENROLL_MSG__INIT;
-        uint8_t      buf[ENROLL_BUF_LEN];
-        ssize_t       len;
-
-        msg.code       = ENROLL_CODE__ENROLL_DONE;
-        msg.has_result = true;
-        msg.result     = result;
-
-        len = enroll_msg__get_packed_size(&msg);
-        if (len < 0) {
-                log_dbg("Failed pack request message.");
-                return -1;
-        }
-
-        enroll_msg__pack(&msg, buf);
-
-        if (flow_write(conn->flow_info.fd, buf, len) < 0) {
-                log_dbg("Failed to send acknowledgment.");
-                return -1;
-        }
-
-        return 0;
-}
-
-void enroll_bootstrap(const struct ipcp_config * conf)
-{
-        assert(conf);
-
-        memcpy(&enroll.conf, conf, sizeof(enroll.conf));
-}
-
-struct ipcp_config * enroll_get_conf(void)
-{
-        return &enroll.conf;
-}
-
-int enroll_init(void)
-{
-        struct conn_info info;
-
-        memset(&info, 0, sizeof(info));
-
-        strcpy(info.comp_name, ENROLL_COMP);
-        strcpy(info.protocol, ENROLL_PROTO);
-        info.pref_version = 1;
-        info.pref_syntax  = PROTO_GPB;
-        info.addr         = 0;
-
-        if (connmgr_comp_init(COMPID_ENROLL, &info)) {
-                log_err("Failed to register with connmgr.");
-                return -1;
-        }
-
-        enroll.state = ENROLL_INIT;
-
-        return 0;
-}
-
-void enroll_fini(void)
-{
-        if (enroll.state == ENROLL_RUNNING)
-                pthread_join(enroll.listener, NULL);
-
-        connmgr_comp_fini(COMPID_ENROLL);
-}
-
-int enroll_start(void)
-{
-        if (pthread_create(&enroll.listener, NULL, enroll_handle, NULL))
-                return -1;
-
-        enroll.state = ENROLL_RUNNING;
-
-        return 0;
-}
-
-void enroll_stop(void)
-{
-        if (enroll.state == ENROLL_RUNNING)
-                pthread_cancel(enroll.listener);
-}
+#include "common/enroll.c"
diff --git a/src/ipcpd/broadcast/enroll.h b/src/ipcpd/broadcast/enroll.h
deleted file mode 100644
index 5c7f1a02..00000000
--- a/src/ipcpd/broadcast/enroll.h
+++ /dev/null
@@ -1,47 +0,0 @@
-/*
- * Ouroboros - Copyright (C) 2016 - 2021
- *
- * Enrollment Task
- *
- *    Dimitri Staessens <dimitri@ouroboros.rocks>
- *    Sander Vrijders   <sander@ouroboros.rocks>
- *
- * 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/.
- */
-
-#ifndef OUROBOROS_IPCPD_BROADCAST_ENROLL_H
-#define OUROBOROS_IPCPD_BROADCAST_ENROLL_H
-
-#include <ouroboros/ipcp.h>
-
-#include "comp.h"
-
-int                  enroll_init(void);
-
-void                 enroll_fini(void);
-
-int                  enroll_start(void);
-
-void                 enroll_stop(void);
-
-void                 enroll_bootstrap(const struct ipcp_config * conf);
-
-int                  enroll_boot(struct conn * conn);
-
-int                  enroll_done(struct conn * conn,
-                                 int           result);
-
-struct ipcp_config * enroll_get_conf(void);
-
-#endif /* OUROBOROS_IPCPD_BROADCAST_ENROLL_H */
diff --git a/src/ipcpd/broadcast/main.c b/src/ipcpd/broadcast/main.c
index b7555803..a2643029 100644
--- a/src/ipcpd/broadcast/main.c
+++ b/src/ipcpd/broadcast/main.c
@@ -29,6 +29,7 @@
 #include "config.h"
 
 #define OUROBOROS_PREFIX "broadcast-ipcp"
+#define THIS_TYPE IPCP_BROADCAST
 
 #include <ouroboros/errno.h>
 #include <ouroboros/hash.h>
@@ -39,9 +40,9 @@
 #include <ouroboros/rib.h>
 #include <ouroboros/time_utils.h>
 
-#include "connmgr.h"
+#include "common/connmgr.h"
+#include "common/enroll.h"
 #include "dt.h"
-#include "enroll.h"
 #include "ipcp.h"
 
 #include <stdbool.h>
@@ -51,8 +52,6 @@
 #include <assert.h>
 #include <inttypes.h>
 
-#define THIS_TYPE IPCP_BROADCAST
-
 struct ipcp ipcpi;
 
 static int initialize_components(const struct ipcp_config * conf)
diff --git a/src/ipcpd/unicast/comp.h b/src/ipcpd/common/comp.h
index 45880aab..95e59b24 100644
--- a/src/ipcpd/unicast/comp.h
+++ b/src/ipcpd/common/comp.h
@@ -1,7 +1,7 @@
 /*
  * Ouroboros - Copyright (C) 2016 - 2021
  *
- * Components for the unicast IPC process
+ * Components for the unicast/broadcast IPC process
  *
  *    Dimitri Staessens <dimitri@ouroboros.rocks>
  *    Sander Vrijders   <sander@ouroboros.rocks>
@@ -20,13 +20,11 @@
  * Foundation, Inc., http://www.fsf.org/about/contact/.
  */
 
-#ifndef OUROBOROS_IPCPD_UNICAST_COMP_H
-#define OUROBOROS_IPCPD_UNICAST_COMP_H
+#ifndef OUROBOROS_IPCPD_COMMON_COMP_H
+#define OUROBOROS_IPCPD_COMMON_COMP_H
 
 #include <ouroboros/cacep.h>
 
-#include "dt.h"
-
 #define DST_MAX_STRLEN 64
 
 enum comp_id {
@@ -45,4 +43,4 @@ struct conn {
         } flow_info;
 };
 
-#endif /* OUROBOROS_IPCPD_UNICAST_COMP_H */
+#endif /* OUROBOROS_IPCPD_COMMON_COMP_H */
diff --git a/src/ipcpd/common/connmgr.c b/src/ipcpd/common/connmgr.c
new file mode 100644
index 00000000..9002467c
--- /dev/null
+++ b/src/ipcpd/common/connmgr.c
@@ -0,0 +1,518 @@
+/*
+ * Ouroboros - Copyright (C) 2016 - 2021
+ *
+ * Handles connections between components
+ *
+ *    Dimitri Staessens <dimitri@ouroboros.rocks>
+ *    Sander Vrijders   <sander@ouroboros.rocks>
+ *
+ * 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 OUROBOROS_PREFIX "connection-manager"
+
+#include <ouroboros/dev.h>
+#include <ouroboros/cacep.h>
+#include <ouroboros/errno.h>
+#include <ouroboros/list.h>
+#include <ouroboros/logs.h>
+#include <ouroboros/notifier.h>
+
+#include "connmgr.h"
+#include "ipcp.h"
+
+#include <pthread.h>
+#include <string.h>
+#include <stdlib.h>
+#include <assert.h>
+
+enum connmgr_state {
+        CONNMGR_NULL = 0,
+        CONNMGR_INIT,
+        CONNMGR_RUNNING
+};
+
+struct conn_el {
+        struct list_head next;
+        struct conn      conn;
+};
+
+struct comp {
+        struct conn_info info;
+
+        struct list_head conns;
+        struct list_head pending;
+
+        pthread_cond_t   cond;
+        pthread_mutex_t  lock;
+};
+
+struct {
+        struct comp        comps[COMPID_MAX];
+        enum connmgr_state state;
+
+        pthread_t          acceptor;
+} connmgr;
+
+static int get_id_by_name(const char * name)
+{
+        enum comp_id i;
+
+        for (i = 0; i < COMPID_MAX; ++i)
+                if (strcmp(name, connmgr.comps[i].info.comp_name) == 0)
+                        return i;
+
+        return -1;
+}
+
+static int get_conn_by_fd(int           fd,
+                          enum comp_id  id,
+                          struct conn * conn)
+{
+        struct list_head * p;
+
+        pthread_mutex_lock(&connmgr.comps[id].lock);
+
+        list_for_each(p, &connmgr.comps[id].conns) {
+                struct conn_el * c =
+                        list_entry(p, struct conn_el, next);
+                if (c->conn.flow_info.fd == fd) {
+                        *conn = c->conn;
+                        pthread_mutex_unlock(&connmgr.comps[id].lock);
+                        return 0;
+                }
+        }
+
+        pthread_mutex_unlock(&connmgr.comps[id].lock);
+
+        return -1;
+}
+
+static int add_comp_conn(enum comp_id       id,
+                         int                fd,
+                         qosspec_t          qs,
+                         struct conn_info * rcv_info)
+{
+        struct conn_el * el;
+
+        el = malloc(sizeof(*el));
+        if (el == NULL) {
+                log_err("Not enough memory.");
+                return -1;
+        }
+
+        el->conn.conn_info    = *rcv_info;
+        el->conn.flow_info.fd = fd;
+        el->conn.flow_info.qs = qs;
+
+        pthread_mutex_lock(&connmgr.comps[id].lock);
+
+        list_add(&el->next, &connmgr.comps[id].pending);
+        pthread_cond_signal(&connmgr.comps[id].cond);
+
+        pthread_mutex_unlock(&connmgr.comps[id].lock);
+
+        return 0;
+}
+
+static void * flow_acceptor(void * o)
+{
+        int               fd;
+        qosspec_t         qs;
+        struct conn_info  rcv_info;
+        struct conn_info  fail_info;
+
+        (void) o;
+
+        memset(&fail_info, 0, sizeof(fail_info));
+
+        while (true) {
+                int id;
+
+                fd = flow_accept(&qs, NULL);
+                if (fd < 0) {
+                        if (fd != -EIRMD)
+                                log_warn("Flow accept failed: %d", fd);
+                        continue;
+                }
+
+                if (cacep_rcv(fd, &rcv_info)) {
+                        log_dbg("Error establishing application connection.");
+                        flow_dealloc(fd);
+                        continue;
+                }
+
+                id = get_id_by_name(rcv_info.comp_name);
+                if (id < 0) {
+                        log_dbg("Connection request for unknown component %s.",
+                                rcv_info.comp_name);
+                        cacep_snd(fd, &fail_info);
+                        flow_dealloc(fd);
+                        continue;
+                }
+
+                assert(id < COMPID_MAX);
+
+                if (cacep_snd(fd, &connmgr.comps[id].info)) {
+                        log_dbg("Failed to respond to request.");
+                        flow_dealloc(fd);
+                        continue;
+                }
+
+                if (add_comp_conn(id, fd, qs, &rcv_info)) {
+                        log_dbg("Failed to add new connection.");
+                        flow_dealloc(fd);
+                        continue;
+                }
+        }
+
+        return (void *) 0;
+}
+
+static void handle_event(void *       self,
+                         int          event,
+                         const void * o)
+{
+        struct conn conn;
+
+        (void) self;
+
+        if (!(event == NOTIFY_DT_FLOW_UP ||
+              event == NOTIFY_DT_FLOW_DOWN ||
+              event == NOTIFY_DT_FLOW_DEALLOC))
+                return;
+
+        if (get_conn_by_fd(*((int *) o), COMPID_DT, &conn))
+                return;
+
+        switch (event) {
+        case NOTIFY_DT_FLOW_UP:
+                notifier_event(NOTIFY_DT_CONN_UP, &conn);
+                break;
+        case NOTIFY_DT_FLOW_DOWN:
+                notifier_event(NOTIFY_DT_CONN_DOWN, &conn);
+                break;
+        case NOTIFY_DT_FLOW_DEALLOC:
+                notifier_event(NOTIFY_DT_CONN_DEL, &conn);
+                break;
+        default:
+                break;
+        }
+}
+
+int connmgr_init(void)
+{
+        connmgr.state = CONNMGR_INIT;
+
+        if (notifier_reg(handle_event, NULL))
+                return -1;
+
+        return 0;
+}
+
+void connmgr_fini(void)
+{
+        int i;
+
+        notifier_unreg(handle_event);
+
+        if (connmgr.state == CONNMGR_RUNNING)
+                pthread_join(connmgr.acceptor, NULL);
+
+        for (i = 0; i < COMPID_MAX; ++i)
+                connmgr_comp_fini(i);
+}
+
+int connmgr_start(void)
+{
+        if (pthread_create(&connmgr.acceptor, NULL, flow_acceptor, NULL))
+                return -1;
+
+        connmgr.state = CONNMGR_RUNNING;
+
+        return 0;
+}
+
+void connmgr_stop(void)
+{
+        if (connmgr.state == CONNMGR_RUNNING)
+                pthread_cancel(connmgr.acceptor);
+}
+
+int connmgr_comp_init(enum comp_id             id,
+                      const struct conn_info * info)
+{
+        struct comp * comp;
+
+        assert(id >= 0 && id < COMPID_MAX);
+
+        comp = connmgr.comps + id;
+
+        if (pthread_mutex_init(&comp->lock, NULL))
+                return -1;
+
+        if (pthread_cond_init(&comp->cond, NULL)) {
+                pthread_mutex_destroy(&comp->lock);
+                return -1;
+        }
+
+        list_head_init(&comp->conns);
+        list_head_init(&comp->pending);
+
+        memcpy(&connmgr.comps[id].info, info, sizeof(connmgr.comps[id].info));
+
+        return 0;
+}
+
+void connmgr_comp_fini(enum comp_id id)
+{
+        struct list_head * p;
+        struct list_head * h;
+        struct comp *      comp;
+
+        assert(id >= 0 && id < COMPID_MAX);
+
+        if (strlen(connmgr.comps[id].info.comp_name) == 0)
+                return;
+
+        comp = connmgr.comps + id;
+
+        pthread_mutex_lock(&comp->lock);
+
+        list_for_each_safe(p, h, &comp->conns) {
+                struct conn_el * e = list_entry(p, struct conn_el, next);
+                list_del(&e->next);
+                free(e);
+        }
+
+        list_for_each_safe(p, h, &comp->pending) {
+                struct conn_el * e = list_entry(p, struct conn_el, next);
+                list_del(&e->next);
+                free(e);
+        }
+
+        pthread_mutex_unlock(&comp->lock);
+
+        pthread_cond_destroy(&comp->cond);
+        pthread_mutex_destroy(&comp->lock);
+
+        memset(&connmgr.comps[id].info, 0, sizeof(connmgr.comps[id].info));
+}
+
+int connmgr_ipcp_connect(const char * dst,
+                         const char * component,
+                         qosspec_t    qs)
+{
+        struct conn_el * ce;
+        int              id;
+
+        assert(dst);
+        assert(component);
+
+        ce = malloc(sizeof(*ce));
+        if (ce == NULL) {
+                log_dbg("Out of memory.");
+                return -1;
+        }
+
+        id = get_id_by_name(component);
+        if (id < 0) {
+                log_dbg("No such component: %s", component);
+                free(ce);
+                return -1;
+        }
+
+        if (connmgr_alloc(id, dst, &qs, &ce->conn)) {
+                free(ce);
+                return -1;
+        }
+
+        if (strlen(dst) > DST_MAX_STRLEN) {
+                log_warn("Truncating dst length for connection.");
+                memcpy(ce->conn.flow_info.dst, dst, DST_MAX_STRLEN);
+                ce->conn.flow_info.dst[DST_MAX_STRLEN] = '\0';
+        } else {
+                strcpy(ce->conn.flow_info.dst, dst);
+        }
+
+        pthread_mutex_lock(&connmgr.comps[id].lock);
+
+        list_add(&ce->next, &connmgr.comps[id].conns);
+
+        pthread_mutex_unlock(&connmgr.comps[id].lock);
+
+        return 0;
+}
+
+int connmgr_ipcp_disconnect(const char * dst,
+                            const char * component)
+{
+        struct list_head * p;
+        struct list_head * h;
+        int                id;
+
+        assert(dst);
+        assert(component);
+
+        id = get_id_by_name(component);
+        if (id < 0)
+                return -1;
+
+        pthread_mutex_lock(&connmgr.comps[id].lock);
+
+        list_for_each_safe(p,h, &connmgr.comps[id].conns) {
+                struct conn_el * el = list_entry(p, struct conn_el, next);
+                if (strcmp(el->conn.flow_info.dst, dst) == 0) {
+                        int ret;
+                        pthread_mutex_unlock(&connmgr.comps[id].lock);
+                        list_del(&el->next);
+                        ret = connmgr_dealloc(id, &el->conn);
+                        free(el);
+                        return ret;
+                }
+        }
+
+        pthread_mutex_unlock(&connmgr.comps[id].lock);
+
+        return 0;
+}
+
+int connmgr_alloc(enum comp_id  id,
+                  const char *  dst,
+                  qosspec_t *   qs,
+                  struct conn * conn)
+{
+        assert(id >= 0 && id < COMPID_MAX);
+        assert(dst);
+
+        conn->flow_info.fd = flow_alloc(dst, qs, NULL);
+        if (conn->flow_info.fd < 0) {
+                log_dbg("Failed to allocate flow to %s.", dst);
+                return -1;
+        }
+
+        if (qs != NULL)
+                conn->flow_info.qs = *qs;
+        else
+                memset(&conn->flow_info.qs, 0, sizeof(conn->flow_info.qs));
+
+        log_dbg("Sending cacep info for protocol %s to fd %d.",
+                connmgr.comps[id].info.protocol, conn->flow_info.fd);
+
+        if (cacep_snd(conn->flow_info.fd, &connmgr.comps[id].info)) {
+                log_dbg("Failed to create application connection.");
+                flow_dealloc(conn->flow_info.fd);
+                return -1;
+        }
+
+        if (cacep_rcv(conn->flow_info.fd, &conn->conn_info)) {
+                log_dbg("Failed to connect to application.");
+                flow_dealloc(conn->flow_info.fd);
+                return -1;
+        }
+
+        if (strcmp(connmgr.comps[id].info.protocol, conn->conn_info.protocol)) {
+                log_dbg("Unknown protocol (requested %s, got %s).",
+                        connmgr.comps[id].info.protocol,
+                        conn->conn_info.protocol);
+                flow_dealloc(conn->flow_info.fd);
+                return -1;
+        }
+
+        if (connmgr.comps[id].info.pref_version !=
+            conn->conn_info.pref_version) {
+                log_dbg("Unknown protocol version.");
+                flow_dealloc(conn->flow_info.fd);
+                return -1;
+        }
+
+        if (connmgr.comps[id].info.pref_syntax != conn->conn_info.pref_syntax) {
+                log_dbg("Unknown protocol syntax.");
+                flow_dealloc(conn->flow_info.fd);
+                return -1;
+        }
+
+        switch (id) {
+        case COMPID_DT:
+                notifier_event(NOTIFY_DT_CONN_ADD, conn);
+#if defined(BUILD_IPCP_UNICAST) && defined(IPCP_CONN_WAIT_DIR)
+                dir_wait_running();
+#endif
+                break;
+        case COMPID_MGMT:
+                notifier_event(NOTIFY_MGMT_CONN_ADD, conn);
+                break;
+        default:
+                break;
+        }
+
+        return 0;
+}
+
+int connmgr_dealloc(enum comp_id  id,
+                    struct conn * conn)
+{
+        switch (id) {
+        case COMPID_DT:
+                notifier_event(NOTIFY_DT_CONN_DEL, conn);
+                break;
+#if defined(BUILD_IPCP_UNICAST) && defined(IPCP_CONN_WAIT_DIR)
+        case COMPID_MGMT:
+                notifier_event(NOTIFY_MGMT_CONN_DEL, conn);
+                break;
+#endif
+        default:
+                break;
+        }
+
+        return flow_dealloc(conn->flow_info.fd);
+}
+
+
+int connmgr_wait(enum comp_id  id,
+                 struct conn * conn)
+{
+        struct conn_el * el;
+        struct comp *    comp;
+
+        assert(id >= 0 && id < COMPID_MAX);
+        assert(conn);
+
+        comp = connmgr.comps + id;
+
+        pthread_mutex_lock(&comp->lock);
+
+        pthread_cleanup_push((void(*)(void *))pthread_mutex_unlock,
+                             (void *) &comp->lock);
+
+        while (list_is_empty(&comp->pending))
+                pthread_cond_wait(&comp->cond, &comp->lock);
+
+        pthread_cleanup_pop(false);
+
+        el = list_first_entry((&comp->pending), struct conn_el, next);
+        if (el == NULL) {
+                pthread_mutex_unlock(&comp->lock);
+                return -1;
+        }
+
+        *conn = el->conn;
+
+        list_del(&el->next);
+        list_add(&el->next, &connmgr.comps[id].conns);
+
+        pthread_mutex_unlock(&comp->lock);
+
+        return 0;
+}
diff --git a/src/ipcpd/unicast/connmgr.h b/src/ipcpd/common/connmgr.h
index 92892a3d..5f7b557f 100644
--- a/src/ipcpd/unicast/connmgr.h
+++ b/src/ipcpd/common/connmgr.h
@@ -20,8 +20,8 @@
  * Foundation, Inc., http://www.fsf.org/about/contact/.
  */
 
-#ifndef OUROBOROS_IPCPD_UNICAST_CONNMGR_H
-#define OUROBOROS_IPCPD_UNICAST_CONNMGR_H
+#ifndef OUROBOROS_IPCPD_COMMON_CONNMGR_H
+#define OUROBOROS_IPCPD_COMMON_CONNMGR_H
 
 #include <ouroboros/cacep.h>
 #include <ouroboros/qos.h>
@@ -71,4 +71,4 @@ int         connmgr_dealloc(enum comp_id  id,
 int         connmgr_wait(enum comp_id  id,
                          struct conn * conn);
 
-#endif /* OUROBOROS_IPCPD_UNICAST_CONNMGR_H */
+#endif /* OUROBOROS_IPCPD_COMMON_CONNMGR_H */
diff --git a/src/ipcpd/common/enroll.c b/src/ipcpd/common/enroll.c
new file mode 100644
index 00000000..090067d8
--- /dev/null
+++ b/src/ipcpd/common/enroll.c
@@ -0,0 +1,385 @@
+/*
+ * Ouroboros - Copyright (C) 2016 - 2021
+ *
+ * Enrollment Task
+ *
+ *    Dimitri Staessens <dimitri@ouroboros.rocks>
+ *    Sander Vrijders   <sander@ouroboros.rocks>
+ *
+ * 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 199309L
+#endif
+
+#define OUROBOROS_PREFIX "enrollment"
+
+#include <ouroboros/endian.h>
+#include <ouroboros/errno.h>
+#include <ouroboros/time_utils.h>
+#include <ouroboros/dev.h>
+#include <ouroboros/logs.h>
+#include <ouroboros/errno.h>
+#include <ouroboros/sockets.h>
+
+#include "common/connmgr.h"
+#include "common/enroll.h"
+#include "ipcp.h"
+
+#include <assert.h>
+#include <stdlib.h>
+#include <string.h>
+#include <pthread.h>
+
+#include "ipcp_config.pb-c.h"
+typedef EnrollMsg enroll_msg_t;
+
+#define ENROLL_COMP             "Enrollment"
+#define ENROLL_PROTO            "OEP" /* Ouroboros enrollment protocol */
+#define ENROLL_WARN_TIME_OFFSET 20
+#define ENROLL_BUF_LEN          1024
+
+enum enroll_state {
+        ENROLL_NULL = 0,
+        ENROLL_INIT,
+        ENROLL_RUNNING
+};
+
+struct {
+        struct ipcp_config conf;
+        enum enroll_state  state;
+        pthread_t          listener;
+} enroll;
+
+static int send_rcv_enroll_msg(int fd)
+{
+        enroll_msg_t    req = ENROLL_MSG__INIT;
+        enroll_msg_t *  reply;
+        uint8_t         buf[ENROLL_BUF_LEN];
+        ssize_t         len;
+        ssize_t         delta_t;
+        struct timespec t0;
+        struct timespec rtt;
+
+        req.code = ENROLL_CODE__ENROLL_REQ;
+
+        len = enroll_msg__get_packed_size(&req);
+        if (len < 0) {
+                log_dbg("Failed pack request message.");
+                return -1;
+        }
+
+        enroll_msg__pack(&req, buf);
+
+        clock_gettime(CLOCK_REALTIME, &t0);
+
+        if (flow_write(fd, buf, len) < 0) {
+                log_dbg("Failed to send request message.");
+                return -1;
+        }
+
+        len = flow_read(fd, buf, ENROLL_BUF_LEN);
+        if (len < 0) {
+                log_dbg("No enrollment reply received.");
+                return -1;
+        }
+
+        log_dbg("Received enrollment info (%zd bytes).", len);
+
+        reply = enroll_msg__unpack(NULL, len, buf);
+        if (reply == NULL) {
+                log_dbg("No enrollment response.");
+                return -1;
+        }
+
+        if (reply->code != ENROLL_CODE__ENROLL_BOOT) {
+                log_dbg("Failed to unpack enrollment response.");
+                enroll_msg__free_unpacked(reply, NULL);
+                return -1;
+        }
+
+        if (!(reply->has_t_sec && reply->has_t_nsec)) {
+                log_dbg("No time in response message.");
+                enroll_msg__free_unpacked(reply, NULL);
+                return -1;
+        }
+
+        clock_gettime(CLOCK_REALTIME, &rtt);
+
+        delta_t = ts_diff_ms(&t0, &rtt);
+
+        rtt.tv_sec  = reply->t_sec;
+        rtt.tv_nsec = reply->t_nsec;
+
+        if (labs(ts_diff_ms(&t0, &rtt)) - delta_t > ENROLL_WARN_TIME_OFFSET)
+                log_warn("Clock offset above threshold.");
+
+        strcpy(enroll.conf.layer_info.layer_name,
+               reply->conf->layer_info->layer_name);
+        enroll.conf.type           = reply->conf->ipcp_type;
+#ifdef BUILD_IPCP_UNICAST
+        enroll.conf.addr_size      = reply->conf->addr_size;
+        enroll.conf.eid_size       = reply->conf->eid_size;
+        enroll.conf.max_ttl        = reply->conf->max_ttl;
+        enroll.conf.addr_auth_type = reply->conf->addr_auth_type;
+        enroll.conf.routing_type   = reply->conf->routing_type;
+        enroll.conf.cong_avoid     = reply->conf->cong_avoid;
+#endif
+        enroll.conf.layer_info.dir_hash_algo
+                = reply->conf->layer_info->dir_hash_algo;
+        enroll_msg__free_unpacked(reply, NULL);
+
+        return 0;
+}
+
+static ssize_t enroll_pack(uint8_t ** buf)
+{
+        enroll_msg_t      msg        = ENROLL_MSG__INIT;
+        ipcp_config_msg_t config     = IPCP_CONFIG_MSG__INIT;
+        layer_info_msg_t  layer_info = LAYER_INFO_MSG__INIT;
+        struct timespec   now;
+        ssize_t           len;
+
+        clock_gettime(CLOCK_REALTIME, &now);
+
+        msg.code       = ENROLL_CODE__ENROLL_BOOT;
+        msg.has_t_sec  = true;
+        msg.t_sec      = now.tv_sec;
+        msg.has_t_nsec = true;
+        msg.t_nsec     = now.tv_nsec;
+        msg.conf       = &config;
+
+        config.ipcp_type          = enroll.conf.type;
+#ifdef BUILD_IPCP_UNICAST
+        config.has_addr_size      = true;
+        config.addr_size          = enroll.conf.addr_size;
+        config.has_eid_size       = true;
+        config.eid_size           = enroll.conf.eid_size;
+        config.has_max_ttl        = true;
+        config.max_ttl            = enroll.conf.max_ttl;
+        config.has_addr_auth_type = true;
+        config.addr_auth_type     = enroll.conf.addr_auth_type;
+        config.has_routing_type   = true;
+        config.routing_type       = enroll.conf.routing_type;
+        config.has_cong_avoid     = true;
+        config.cong_avoid         = enroll.conf.cong_avoid;
+#endif
+        config.layer_info         = &layer_info;
+
+        layer_info.layer_name     = (char *) enroll.conf.layer_info.layer_name;
+        layer_info.dir_hash_algo  = enroll.conf.layer_info.dir_hash_algo;
+
+        len = enroll_msg__get_packed_size(&msg);
+
+        *buf = malloc(len);
+        if (*buf == NULL)
+                return -1;
+
+        enroll_msg__pack(&msg, *buf);
+
+        return len;
+}
+
+static void * enroll_handle(void * o)
+{
+        struct conn    conn;
+        uint8_t        buf[ENROLL_BUF_LEN];
+        uint8_t *      reply;
+        ssize_t        len;
+        enroll_msg_t * msg;
+
+        (void) o;
+
+        while (true) {
+                if (connmgr_wait(COMPID_ENROLL, &conn)) {
+                        log_err("Failed to get next connection.");
+                        continue;
+                }
+
+                len = flow_read(conn.flow_info.fd, buf, ENROLL_BUF_LEN);
+                if (len < 0) {
+                        log_err("Failed to read from flow.");
+                        connmgr_dealloc(COMPID_ENROLL, &conn);
+                        continue;
+                }
+
+                msg = enroll_msg__unpack(NULL, len, buf);
+                if (msg == NULL) {
+                        log_err("Failed to unpack message.");
+                        connmgr_dealloc(COMPID_ENROLL, &conn);
+                        continue;
+                }
+
+                if (msg->code != ENROLL_CODE__ENROLL_REQ) {
+                        log_err("Wrong message type.");
+                        connmgr_dealloc(COMPID_ENROLL, &conn);
+                        enroll_msg__free_unpacked(msg, NULL);
+                        continue;
+                }
+
+                log_dbg("Enrolling a new neighbor.");
+
+                enroll_msg__free_unpacked(msg, NULL);
+
+                len = enroll_pack(&reply);
+                if (reply == NULL) {
+                        log_err("Failed to pack enrollment message.");
+                        connmgr_dealloc(COMPID_ENROLL, &conn);
+                        continue;
+                }
+
+                log_dbg("Sending enrollment info (%zd bytes).", len);
+
+                if (flow_write(conn.flow_info.fd, reply, len) < 0) {
+                        log_err("Failed respond to enrollment request.");
+                        connmgr_dealloc(COMPID_ENROLL, &conn);
+                        free(reply);
+                        continue;
+                }
+
+                free(reply);
+
+                len = flow_read(conn.flow_info.fd, buf, ENROLL_BUF_LEN);
+                if (len < 0) {
+                        log_err("Failed to read from flow.");
+                        connmgr_dealloc(COMPID_ENROLL, &conn);
+                        continue;
+                }
+
+                msg = enroll_msg__unpack(NULL, len, buf);
+                if (msg == NULL) {
+                        log_err("Failed to unpack message.");
+                        connmgr_dealloc(COMPID_ENROLL, &conn);
+                        continue;
+                }
+
+                if (msg->code != ENROLL_CODE__ENROLL_DONE || !msg->has_result) {
+                        log_err("Wrong message type.");
+                        enroll_msg__free_unpacked(msg, NULL);
+                        connmgr_dealloc(COMPID_ENROLL, &conn);
+                        continue;
+                }
+
+                if (msg->result == 0)
+                        log_dbg("Neighbor enrollment successful.");
+                else
+                        log_dbg("Neigbor reported failed enrollment.");
+
+                enroll_msg__free_unpacked(msg, NULL);
+
+                connmgr_dealloc(COMPID_ENROLL, &conn);
+        }
+
+        return 0;
+}
+
+int enroll_boot(struct conn * conn)
+{
+        log_dbg("Getting boot information.");
+
+        if (send_rcv_enroll_msg(conn->flow_info.fd)) {
+                log_err("Failed to enroll.");
+                return -1;
+        }
+
+        return 0;
+}
+
+int enroll_done(struct conn * conn,
+                int           result)
+{
+        enroll_msg_t msg = ENROLL_MSG__INIT;
+        uint8_t      buf[ENROLL_BUF_LEN];
+        ssize_t       len;
+
+        msg.code       = ENROLL_CODE__ENROLL_DONE;
+        msg.has_result = true;
+        msg.result     = result;
+
+        len = enroll_msg__get_packed_size(&msg);
+        if (len < 0) {
+                log_dbg("Failed pack request message.");
+                return -1;
+        }
+
+        enroll_msg__pack(&msg, buf);
+
+        if (flow_write(conn->flow_info.fd, buf, len) < 0) {
+                log_dbg("Failed to send acknowledgment.");
+                return -1;
+        }
+
+        return 0;
+}
+
+void enroll_bootstrap(const struct ipcp_config * conf)
+{
+        assert(conf);
+
+        memcpy(&enroll.conf, conf, sizeof(enroll.conf));
+}
+
+struct ipcp_config * enroll_get_conf(void)
+{
+        return &enroll.conf;
+}
+
+int enroll_init(void)
+{
+        struct conn_info info;
+
+        memset(&info, 0, sizeof(info));
+
+        strcpy(info.comp_name, ENROLL_COMP);
+        strcpy(info.protocol, ENROLL_PROTO);
+        info.pref_version = 1;
+        info.pref_syntax  = PROTO_GPB;
+        info.addr         = 0;
+
+        if (connmgr_comp_init(COMPID_ENROLL, &info)) {
+                log_err("Failed to register with connmgr.");
+                return -1;
+        }
+
+        enroll.state = ENROLL_INIT;
+
+        return 0;
+}
+
+void enroll_fini(void)
+{
+        if (enroll.state == ENROLL_RUNNING)
+                pthread_join(enroll.listener, NULL);
+
+        connmgr_comp_fini(COMPID_ENROLL);
+}
+
+int enroll_start(void)
+{
+        if (pthread_create(&enroll.listener, NULL, enroll_handle, NULL))
+                return -1;
+
+        enroll.state = ENROLL_RUNNING;
+
+        return 0;
+}
+
+void enroll_stop(void)
+{
+        if (enroll.state == ENROLL_RUNNING)
+                pthread_cancel(enroll.listener);
+}
diff --git a/src/ipcpd/unicast/enroll.h b/src/ipcpd/common/enroll.h
index 18b31942..fb866416 100644
--- a/src/ipcpd/unicast/enroll.h
+++ b/src/ipcpd/common/enroll.h
@@ -20,8 +20,8 @@
  * Foundation, Inc., http://www.fsf.org/about/contact/.
  */
 
-#ifndef OUROBOROS_IPCPD_UNICAST_ENROLL_H
-#define OUROBOROS_IPCPD_UNICAST_ENROLL_H
+#ifndef OUROBOROS_IPCPD_COMMON_ENROLL_H
+#define OUROBOROS_IPCPD_COMMON_ENROLL_H
 
 #include <ouroboros/ipcp.h>
 
@@ -44,4 +44,4 @@ int                  enroll_done(struct conn * conn,
 
 struct ipcp_config * enroll_get_conf(void);
 
-#endif /* OUROBOROS_IPCPD_UNICAST_ENROLL_H */
+#endif /* OUROBOROS_IPCPD_COMMON_ENROLL_H */
diff --git a/src/ipcpd/unicast/CMakeLists.txt b/src/ipcpd/unicast/CMakeLists.txt
index 035ee5f4..07f12540 100644
--- a/src/ipcpd/unicast/CMakeLists.txt
+++ b/src/ipcpd/unicast/CMakeLists.txt
@@ -29,7 +29,6 @@ if (HAVE_FUSE)
     endif ()
 endif ()
 
-
 set(SOURCE_FILES
   # Add source files here
   addr_auth.c
diff --git a/src/ipcpd/unicast/connmgr.c b/src/ipcpd/unicast/connmgr.c
index 51c4ce26..904deff8 100644
--- a/src/ipcpd/unicast/connmgr.c
+++ b/src/ipcpd/unicast/connmgr.c
@@ -20,505 +20,20 @@
  * Foundation, Inc., http://www.fsf.org/about/contact/.
  */
 
+#include "config.h"
+
 #if defined(__linux__) || defined(__CYGWIN__)
 #define _DEFAULT_SOURCE
 #else
 #define _POSIX_C_SOURCE 200112L
 #endif
 
-#define OUROBOROS_PREFIX "connection-manager"
-
-#include <ouroboros/dev.h>
-#include <ouroboros/cacep.h>
-#include <ouroboros/errno.h>
-#include <ouroboros/list.h>
-#include <ouroboros/logs.h>
-#include <ouroboros/notifier.h>
-
-#include "comp.h"
-#include "connmgr.h"
-#include "dir.h"
-#include "ipcp.h"
-
-#include <pthread.h>
-#include <string.h>
-#include <stdlib.h>
-#include <assert.h>
-
-enum connmgr_state {
-        CONNMGR_NULL = 0,
-        CONNMGR_INIT,
-        CONNMGR_RUNNING
-};
-
-struct conn_el {
-        struct list_head next;
-        struct conn      conn;
-};
-
-struct comp {
-        struct conn_info info;
-
-        struct list_head conns;
-        struct list_head pending;
-
-        pthread_cond_t   cond;
-        pthread_mutex_t  lock;
-};
-
-struct {
-        struct comp        comps[COMPID_MAX];
-        enum connmgr_state state;
-
-        pthread_t          acceptor;
-} connmgr;
-
-static int get_id_by_name(const char * name)
-{
-        enum comp_id i;
-
-        for (i = 0; i < COMPID_MAX; ++i)
-                if (strcmp(name, connmgr.comps[i].info.comp_name) == 0)
-                        return i;
-
-        return -1;
-}
-
-static int get_conn_by_fd(int           fd,
-                          enum comp_id  id,
-                          struct conn * conn)
-{
-        struct list_head * p;
-
-        pthread_mutex_lock(&connmgr.comps[id].lock);
-
-        list_for_each(p, &connmgr.comps[id].conns) {
-                struct conn_el * c =
-                        list_entry(p, struct conn_el, next);
-                if (c->conn.flow_info.fd == fd) {
-                        *conn = c->conn;
-                        pthread_mutex_unlock(&connmgr.comps[id].lock);
-                        return 0;
-                }
-        }
-
-        pthread_mutex_unlock(&connmgr.comps[id].lock);
-
-        return -1;
-}
-
-static int add_comp_conn(enum comp_id       id,
-                         int                fd,
-                         qosspec_t          qs,
-                         struct conn_info * rcv_info)
-{
-        struct conn_el * el;
-
-        el = malloc(sizeof(*el));
-        if (el == NULL) {
-                log_err("Not enough memory.");
-                return -1;
-        }
-
-        el->conn.conn_info    = *rcv_info;
-        el->conn.flow_info.fd = fd;
-        el->conn.flow_info.qs = qs;
-
-        pthread_mutex_lock(&connmgr.comps[id].lock);
-
-        list_add(&el->next, &connmgr.comps[id].pending);
-        pthread_cond_signal(&connmgr.comps[id].cond);
-
-        pthread_mutex_unlock(&connmgr.comps[id].lock);
-
-        return 0;
-}
-
-static void * flow_acceptor(void * o)
-{
-        int               fd;
-        qosspec_t         qs;
-        struct conn_info  rcv_info;
-        struct conn_info  fail_info;
-
-        (void) o;
-
-        memset(&fail_info, 0, sizeof(fail_info));
-
-        while (true) {
-                int id;
-
-                fd = flow_accept(&qs, NULL);
-                if (fd < 0) {
-                        if (fd != -EIRMD)
-                                log_warn("Flow accept failed: %d", fd);
-                        continue;
-                }
-
-                if (cacep_rcv(fd, &rcv_info)) {
-                        log_dbg("Error establishing application connection.");
-                        flow_dealloc(fd);
-                        continue;
-                }
-
-                id = get_id_by_name(rcv_info.comp_name);
-                if (id < 0) {
-                        log_dbg("Connection request for unknown component %s.",
-                                rcv_info.comp_name);
-                        cacep_snd(fd, &fail_info);
-                        flow_dealloc(fd);
-                        continue;
-                }
-
-                assert(id < COMPID_MAX);
-
-                if (cacep_snd(fd, &connmgr.comps[id].info)) {
-                        log_dbg("Failed to respond to request.");
-                        flow_dealloc(fd);
-                        continue;
-                }
-
-                if (add_comp_conn(id, fd, qs, &rcv_info)) {
-                        log_dbg("Failed to add new connection.");
-                        flow_dealloc(fd);
-                        continue;
-                }
-        }
-
-        return (void *) 0;
-}
-
-static void handle_event(void *       self,
-                         int          event,
-                         const void * o)
-{
-        struct conn conn;
-
-        (void) self;
-
-        if (!(event == NOTIFY_DT_FLOW_UP ||
-              event == NOTIFY_DT_FLOW_DOWN ||
-              event == NOTIFY_DT_FLOW_DEALLOC))
-                return;
-
-        if (get_conn_by_fd(*((int *) o), COMPID_DT, &conn))
-                return;
-
-        switch (event) {
-        case NOTIFY_DT_FLOW_UP:
-                notifier_event(NOTIFY_DT_CONN_UP, &conn);
-                break;
-        case NOTIFY_DT_FLOW_DOWN:
-                notifier_event(NOTIFY_DT_CONN_DOWN, &conn);
-                break;
-        case NOTIFY_DT_FLOW_DEALLOC:
-                notifier_event(NOTIFY_DT_CONN_DEL, &conn);
-                break;
-        default:
-                break;
-        }
-}
-
-int connmgr_init(void)
-{
-        connmgr.state = CONNMGR_INIT;
-
-        if (notifier_reg(handle_event, NULL))
-                return -1;
-
-        return 0;
-}
-
-void connmgr_fini(void)
-{
-        int i;
-
-        notifier_unreg(handle_event);
-
-        if (connmgr.state == CONNMGR_RUNNING)
-                pthread_join(connmgr.acceptor, NULL);
-
-        for (i = 0; i < COMPID_MAX; ++i)
-                connmgr_comp_fini(i);
-}
-
-int connmgr_start(void)
-{
-        if (pthread_create(&connmgr.acceptor, NULL, flow_acceptor, NULL))
-                return -1;
-
-        connmgr.state = CONNMGR_RUNNING;
-
-        return 0;
-}
-
-void connmgr_stop(void)
-{
-        if (connmgr.state == CONNMGR_RUNNING)
-                pthread_cancel(connmgr.acceptor);
-}
-
-int connmgr_comp_init(enum comp_id             id,
-                      const struct conn_info * info)
-{
-        struct comp * comp;
-
-        assert(id >= 0 && id < COMPID_MAX);
-
-        comp = connmgr.comps + id;
+#include <ouroboros/ipcp.h>
 
-        if (pthread_mutex_init(&comp->lock, NULL))
-                return -1;
+#define BUILD_IPCP_UNICAST
 
-        if (pthread_cond_init(&comp->cond, NULL)) {
-                pthread_mutex_destroy(&comp->lock);
-                return -1;
-        }
-
-        list_head_init(&comp->conns);
-        list_head_init(&comp->pending);
-
-        memcpy(&connmgr.comps[id].info, info, sizeof(connmgr.comps[id].info));
-
-        return 0;
-}
-
-void connmgr_comp_fini(enum comp_id id)
-{
-        struct list_head * p;
-        struct list_head * h;
-        struct comp *      comp;
-
-        assert(id >= 0 && id < COMPID_MAX);
-
-        if (strlen(connmgr.comps[id].info.comp_name) == 0)
-                return;
-
-        comp = connmgr.comps + id;
-
-        pthread_mutex_lock(&comp->lock);
-
-        list_for_each_safe(p, h, &comp->conns) {
-                struct conn_el * e = list_entry(p, struct conn_el, next);
-                list_del(&e->next);
-                free(e);
-        }
-
-        list_for_each_safe(p, h, &comp->pending) {
-                struct conn_el * e = list_entry(p, struct conn_el, next);
-                list_del(&e->next);
-                free(e);
-        }
-
-        pthread_mutex_unlock(&comp->lock);
-
-        pthread_cond_destroy(&comp->cond);
-        pthread_mutex_destroy(&comp->lock);
-
-        memset(&connmgr.comps[id].info, 0, sizeof(connmgr.comps[id].info));
-}
-
-int connmgr_ipcp_connect(const char * dst,
-                         const char * component,
-                         qosspec_t    qs)
-{
-        struct conn_el * ce;
-        int              id;
-
-        assert(dst);
-        assert(component);
-
-        ce = malloc(sizeof(*ce));
-        if (ce == NULL) {
-                log_dbg("Out of memory.");
-                return -1;
-        }
-
-        id = get_id_by_name(component);
-        if (id < 0) {
-                log_dbg("No such component: %s", component);
-                free(ce);
-                return -1;
-        }
-
-        if (connmgr_alloc(id, dst, &qs, &ce->conn)) {
-                free(ce);
-                return -1;
-        }
-
-        if (strlen(dst) > DST_MAX_STRLEN) {
-                log_warn("Truncating dst length for connection.");
-                memcpy(ce->conn.flow_info.dst, dst, DST_MAX_STRLEN);
-                ce->conn.flow_info.dst[DST_MAX_STRLEN] = '\0';
-        } else {
-                strcpy(ce->conn.flow_info.dst, dst);
-        }
-
-        pthread_mutex_lock(&connmgr.comps[id].lock);
-
-        list_add(&ce->next, &connmgr.comps[id].conns);
-
-        pthread_mutex_unlock(&connmgr.comps[id].lock);
-
-        return 0;
-}
-
-int connmgr_ipcp_disconnect(const char * dst,
-                            const char * component)
-{
-        struct list_head * p;
-        struct list_head * h;
-        int                id;
-
-        assert(dst);
-        assert(component);
-
-        id = get_id_by_name(component);
-        if (id < 0)
-                return -1;
-
-        pthread_mutex_lock(&connmgr.comps[id].lock);
-
-        list_for_each_safe(p,h, &connmgr.comps[id].conns) {
-                struct conn_el * el = list_entry(p, struct conn_el, next);
-                if (strcmp(el->conn.flow_info.dst, dst) == 0) {
-                        int ret;
-                        pthread_mutex_unlock(&connmgr.comps[id].lock);
-                        list_del(&el->next);
-                        ret = connmgr_dealloc(id, &el->conn);
-                        free(el);
-                        return ret;
-                }
-        }
-
-        pthread_mutex_unlock(&connmgr.comps[id].lock);
-
-        return 0;
-}
-
-int connmgr_alloc(enum comp_id  id,
-                  const char *  dst,
-                  qosspec_t *   qs,
-                  struct conn * conn)
-{
-        assert(id >= 0 && id < COMPID_MAX);
-        assert(dst);
-
-        conn->flow_info.fd = flow_alloc(dst, qs, NULL);
-        if (conn->flow_info.fd < 0) {
-                log_dbg("Failed to allocate flow to %s.", dst);
-                return -1;
-        }
-
-        if (qs != NULL)
-                conn->flow_info.qs = *qs;
-        else
-                memset(&conn->flow_info.qs, 0, sizeof(conn->flow_info.qs));
-
-        log_dbg("Sending cacep info for protocol %s to fd %d.",
-                connmgr.comps[id].info.protocol, conn->flow_info.fd);
-
-        if (cacep_snd(conn->flow_info.fd, &connmgr.comps[id].info)) {
-                log_dbg("Failed to create application connection.");
-                flow_dealloc(conn->flow_info.fd);
-                return -1;
-        }
-
-        if (cacep_rcv(conn->flow_info.fd, &conn->conn_info)) {
-                log_dbg("Failed to connect to application.");
-                flow_dealloc(conn->flow_info.fd);
-                return -1;
-        }
-
-        if (strcmp(connmgr.comps[id].info.protocol, conn->conn_info.protocol)) {
-                log_dbg("Unknown protocol (requested %s, got %s).",
-                        connmgr.comps[id].info.protocol,
-                        conn->conn_info.protocol);
-                flow_dealloc(conn->flow_info.fd);
-                return -1;
-        }
-
-        if (connmgr.comps[id].info.pref_version !=
-            conn->conn_info.pref_version) {
-                log_dbg("Unknown protocol version.");
-                flow_dealloc(conn->flow_info.fd);
-                return -1;
-        }
-
-        if (connmgr.comps[id].info.pref_syntax != conn->conn_info.pref_syntax) {
-                log_dbg("Unknown protocol syntax.");
-                flow_dealloc(conn->flow_info.fd);
-                return -1;
-        }
-
-        switch (id) {
-        case COMPID_DT:
-                notifier_event(NOTIFY_DT_CONN_ADD, conn);
 #ifdef IPCP_CONN_WAIT_DIR
-                dir_wait_running();
+ #include "dir.h"
 #endif
-                break;
-        case COMPID_MGMT:
-                notifier_event(NOTIFY_MGMT_CONN_ADD, conn);
-                break;
-        default:
-                break;
-        }
-
-        return 0;
-}
-
-int connmgr_dealloc(enum comp_id  id,
-                    struct conn * conn)
-{
-        switch (id) {
-        case COMPID_DT:
-                notifier_event(NOTIFY_DT_CONN_DEL, conn);
-                break;
-        case COMPID_MGMT:
-                notifier_event(NOTIFY_MGMT_CONN_DEL, conn);
-                break;
-        default:
-                break;
-        }
-
-        return flow_dealloc(conn->flow_info.fd);
-}
-
-
-int connmgr_wait(enum comp_id  id,
-                 struct conn * conn)
-{
-        struct conn_el * el;
-        struct comp *    comp;
-
-        assert(id >= 0 && id < COMPID_MAX);
-        assert(conn);
-
-        comp = connmgr.comps + id;
-
-        pthread_mutex_lock(&comp->lock);
-
-        pthread_cleanup_push((void(*)(void *))pthread_mutex_unlock,
-                             (void *) &comp->lock);
-
-        while (list_is_empty(&comp->pending))
-                pthread_cond_wait(&comp->cond, &comp->lock);
-
-        pthread_cleanup_pop(false);
-
-        el = list_first_entry((&comp->pending), struct conn_el, next);
-        if (el == NULL) {
-                pthread_mutex_unlock(&comp->lock);
-                return -1;
-        }
-
-        *conn = el->conn;
-
-        list_del(&el->next);
-        list_add(&el->next, &connmgr.comps[id].conns);
-
-        pthread_mutex_unlock(&comp->lock);
 
-        return 0;
-}
+#include "common/connmgr.c"
diff --git a/src/ipcpd/unicast/dht.c b/src/ipcpd/unicast/dht.c
index 70c3408a..3dc592db 100644
--- a/src/ipcpd/unicast/dht.c
+++ b/src/ipcpd/unicast/dht.c
@@ -43,7 +43,7 @@
 #include <ouroboros/tpm.h>
 #include <ouroboros/utils.h>
 
-#include "connmgr.h"
+#include "common/connmgr.h"
 #include "dht.h"
 #include "dt.h"
 
diff --git a/src/ipcpd/unicast/dir.h b/src/ipcpd/unicast/dir.h
index 32595749..8aa79638 100644
--- a/src/ipcpd/unicast/dir.h
+++ b/src/ipcpd/unicast/dir.h
@@ -23,6 +23,8 @@
 #ifndef OUROBOROS_IPCPD_UNICAST_DIR_H
 #define OUROBOROS_IPCPD_UNICAST_DIR_H
 
+#include <inttypes.h>
+
 int      dir_init(void);
 
 void     dir_fini(void);
diff --git a/src/ipcpd/unicast/dt.c b/src/ipcpd/unicast/dt.c
index 5d2bd9ce..92496e54 100644
--- a/src/ipcpd/unicast/dt.c
+++ b/src/ipcpd/unicast/dt.c
@@ -41,14 +41,14 @@
 #include <ouroboros/fccntl.h>
 #endif
 
+#include "common/comp.h"
+#include "common/connmgr.h"
 #include "ca.h"
-#include "connmgr.h"
 #include "ipcp.h"
 #include "dt.h"
 #include "pff.h"
 #include "routing.h"
 #include "psched.h"
-#include "comp.h"
 #include "fa.h"
 
 #include <stdlib.h>
diff --git a/src/ipcpd/unicast/enroll.c b/src/ipcpd/unicast/enroll.c
index 3abe431e..500a3895 100644
--- a/src/ipcpd/unicast/enroll.c
+++ b/src/ipcpd/unicast/enroll.c
@@ -1,382 +1,3 @@
-/*
- * Ouroboros - Copyright (C) 2016 - 2021
- *
- * Enrollment Task
- *
- *    Dimitri Staessens <dimitri@ouroboros.rocks>
- *    Sander Vrijders   <sander@ouroboros.rocks>
- *
- * 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 BUILD_IPCP_UNICAST
 
-#if defined(__linux__) || defined(__CYGWIN__)
-#define _DEFAULT_SOURCE
-#else
-#define _POSIX_C_SOURCE 199309L
-#endif
-
-#define OUROBOROS_PREFIX "enrollment"
-
-#include <ouroboros/endian.h>
-#include <ouroboros/errno.h>
-#include <ouroboros/time_utils.h>
-#include <ouroboros/dev.h>
-#include <ouroboros/logs.h>
-#include <ouroboros/errno.h>
-#include <ouroboros/sockets.h>
-
-#include "connmgr.h"
-#include "enroll.h"
-#include "ipcp.h"
-
-#include <assert.h>
-#include <stdlib.h>
-#include <string.h>
-#include <pthread.h>
-
-#include "ipcp_config.pb-c.h"
-typedef EnrollMsg enroll_msg_t;
-
-#define ENROLL_COMP             "Enrollment"
-#define ENROLL_PROTO            "OEP" /* Ouroboros enrollment protocol */
-#define ENROLL_WARN_TIME_OFFSET 20
-#define ENROLL_BUF_LEN          1024
-
-enum enroll_state {
-        ENROLL_NULL = 0,
-        ENROLL_INIT,
-        ENROLL_RUNNING
-};
-
-struct {
-        struct ipcp_config conf;
-        enum enroll_state  state;
-        pthread_t          listener;
-} enroll;
-
-static int send_rcv_enroll_msg(int fd)
-{
-        enroll_msg_t    req = ENROLL_MSG__INIT;
-        enroll_msg_t *  reply;
-        uint8_t         buf[ENROLL_BUF_LEN];
-        ssize_t         len;
-        ssize_t         delta_t;
-        struct timespec t0;
-        struct timespec rtt;
-
-        req.code = ENROLL_CODE__ENROLL_REQ;
-
-        len = enroll_msg__get_packed_size(&req);
-        if (len < 0) {
-                log_dbg("Failed pack request message.");
-                return -1;
-        }
-
-        enroll_msg__pack(&req, buf);
-
-        clock_gettime(CLOCK_REALTIME, &t0);
-
-        if (flow_write(fd, buf, len) < 0) {
-                log_dbg("Failed to send request message.");
-                return -1;
-        }
-
-        len = flow_read(fd, buf, ENROLL_BUF_LEN);
-        if (len < 0) {
-                log_dbg("No enrollment reply received.");
-                return -1;
-        }
-
-        log_dbg("Received enrollment info (%zd bytes).", len);
-
-        reply = enroll_msg__unpack(NULL, len, buf);
-        if (reply == NULL) {
-                log_dbg("No enrollment response.");
-                return -1;
-        }
-
-        if (reply->code != ENROLL_CODE__ENROLL_BOOT) {
-                log_dbg("Failed to unpack enrollment response.");
-                enroll_msg__free_unpacked(reply, NULL);
-                return -1;
-        }
-
-        if (!(reply->has_t_sec && reply->has_t_nsec)) {
-                log_dbg("No time in response message.");
-                enroll_msg__free_unpacked(reply, NULL);
-                return -1;
-        }
-
-        clock_gettime(CLOCK_REALTIME, &rtt);
-
-        delta_t = ts_diff_ms(&t0, &rtt);
-
-        rtt.tv_sec  = reply->t_sec;
-        rtt.tv_nsec = reply->t_nsec;
-
-        if (labs(ts_diff_ms(&t0, &rtt)) - delta_t > ENROLL_WARN_TIME_OFFSET)
-                log_warn("Clock offset above threshold.");
-
-        strcpy(enroll.conf.layer_info.layer_name,
-               reply->conf->layer_info->layer_name);
-        enroll.conf.type           = reply->conf->ipcp_type;
-        enroll.conf.addr_size      = reply->conf->addr_size;
-        enroll.conf.eid_size       = reply->conf->eid_size;
-        enroll.conf.max_ttl        = reply->conf->max_ttl;
-        enroll.conf.addr_auth_type = reply->conf->addr_auth_type;
-        enroll.conf.routing_type   = reply->conf->routing_type;
-        enroll.conf.cong_avoid     = reply->conf->cong_avoid;
-        enroll.conf.layer_info.dir_hash_algo
-                = reply->conf->layer_info->dir_hash_algo;
-
-        enroll_msg__free_unpacked(reply, NULL);
-
-        return 0;
-}
-
-static ssize_t enroll_pack(uint8_t ** buf)
-{
-        enroll_msg_t      msg        = ENROLL_MSG__INIT;
-        ipcp_config_msg_t config     = IPCP_CONFIG_MSG__INIT;
-        layer_info_msg_t  layer_info = LAYER_INFO_MSG__INIT;
-        struct timespec   now;
-        ssize_t           len;
-
-        clock_gettime(CLOCK_REALTIME, &now);
-
-        msg.code       = ENROLL_CODE__ENROLL_BOOT;
-        msg.has_t_sec  = true;
-        msg.t_sec      = now.tv_sec;
-        msg.has_t_nsec = true;
-        msg.t_nsec     = now.tv_nsec;
-        msg.conf       = &config;
-
-        config.ipcp_type          = enroll.conf.type;
-        config.has_addr_size      = true;
-        config.addr_size          = enroll.conf.addr_size;
-        config.has_eid_size       = true;
-        config.eid_size           = enroll.conf.eid_size;
-        config.has_max_ttl        = true;
-        config.max_ttl            = enroll.conf.max_ttl;
-        config.has_addr_auth_type = true;
-        config.addr_auth_type     = enroll.conf.addr_auth_type;
-        config.has_routing_type   = true;
-        config.routing_type       = enroll.conf.routing_type;
-        config.has_cong_avoid     = true;
-        config.cong_avoid         = enroll.conf.cong_avoid;
-        config.layer_info         = &layer_info;
-
-        layer_info.layer_name     = (char *) enroll.conf.layer_info.layer_name;
-        layer_info.dir_hash_algo  = enroll.conf.layer_info.dir_hash_algo;
-
-        len = enroll_msg__get_packed_size(&msg);
-
-        *buf = malloc(len);
-        if (*buf == NULL)
-                return -1;
-
-        enroll_msg__pack(&msg, *buf);
-
-        return len;
-}
-
-static void * enroll_handle(void * o)
-{
-        struct conn    conn;
-        uint8_t        buf[ENROLL_BUF_LEN];
-        uint8_t *      reply;
-        ssize_t        len;
-        enroll_msg_t * msg;
-
-        (void) o;
-
-        while (true) {
-                if (connmgr_wait(COMPID_ENROLL, &conn)) {
-                        log_err("Failed to get next connection.");
-                        continue;
-                }
-
-                len = flow_read(conn.flow_info.fd, buf, ENROLL_BUF_LEN);
-                if (len < 0) {
-                        log_err("Failed to read from flow.");
-                        connmgr_dealloc(COMPID_ENROLL, &conn);
-                        continue;
-                }
-
-                msg = enroll_msg__unpack(NULL, len, buf);
-                if (msg == NULL) {
-                        log_err("Failed to unpack message.");
-                        connmgr_dealloc(COMPID_ENROLL, &conn);
-                        continue;
-                }
-
-                if (msg->code != ENROLL_CODE__ENROLL_REQ) {
-                        log_err("Wrong message type.");
-                        connmgr_dealloc(COMPID_ENROLL, &conn);
-                        enroll_msg__free_unpacked(msg, NULL);
-                        continue;
-                }
-
-                log_dbg("Enrolling a new neighbor.");
-
-                enroll_msg__free_unpacked(msg, NULL);
-
-                len = enroll_pack(&reply);
-                if (reply == NULL) {
-                        log_err("Failed to pack enrollment message.");
-                        connmgr_dealloc(COMPID_ENROLL, &conn);
-                        continue;
-                }
-
-                log_dbg("Sending enrollment info (%zd bytes).", len);
-
-                if (flow_write(conn.flow_info.fd, reply, len) < 0) {
-                        log_err("Failed respond to enrollment request.");
-                        connmgr_dealloc(COMPID_ENROLL, &conn);
-                        free(reply);
-                        continue;
-                }
-
-                free(reply);
-
-                len = flow_read(conn.flow_info.fd, buf, ENROLL_BUF_LEN);
-                if (len < 0) {
-                        log_err("Failed to read from flow.");
-                        connmgr_dealloc(COMPID_ENROLL, &conn);
-                        continue;
-                }
-
-                msg = enroll_msg__unpack(NULL, len, buf);
-                if (msg == NULL) {
-                        log_err("Failed to unpack message.");
-                        connmgr_dealloc(COMPID_ENROLL, &conn);
-                        continue;
-                }
-
-                if (msg->code != ENROLL_CODE__ENROLL_DONE || !msg->has_result) {
-                        log_err("Wrong message type.");
-                        enroll_msg__free_unpacked(msg, NULL);
-                        connmgr_dealloc(COMPID_ENROLL, &conn);
-                        continue;
-                }
-
-                if (msg->result == 0)
-                        log_dbg("Neighbor enrollment successful.");
-                else
-                        log_dbg("Neigbor reported failed enrollment.");
-
-                enroll_msg__free_unpacked(msg, NULL);
-
-                connmgr_dealloc(COMPID_ENROLL, &conn);
-        }
-
-        return 0;
-}
-
-int enroll_boot(struct conn * conn)
-{
-        log_dbg("Getting boot information.");
-
-        if (send_rcv_enroll_msg(conn->flow_info.fd)) {
-                log_err("Failed to enroll.");
-                return -1;
-        }
-
-        return 0;
-}
-
-int enroll_done(struct conn * conn,
-                int           result)
-{
-        enroll_msg_t msg = ENROLL_MSG__INIT;
-        uint8_t      buf[ENROLL_BUF_LEN];
-        ssize_t       len;
-
-        msg.code       = ENROLL_CODE__ENROLL_DONE;
-        msg.has_result = true;
-        msg.result     = result;
-
-        len = enroll_msg__get_packed_size(&msg);
-        if (len < 0) {
-                log_dbg("Failed pack request message.");
-                return -1;
-        }
-
-        enroll_msg__pack(&msg, buf);
-
-        if (flow_write(conn->flow_info.fd, buf, len) < 0) {
-                log_dbg("Failed to send acknowledgment.");
-                return -1;
-        }
-
-        return 0;
-}
-
-void enroll_bootstrap(const struct ipcp_config * conf)
-{
-        assert(conf);
-
-        memcpy(&enroll.conf, conf, sizeof(enroll.conf));
-}
-
-struct ipcp_config * enroll_get_conf(void)
-{
-        return &enroll.conf;
-}
-
-int enroll_init(void)
-{
-        struct conn_info info;
-
-        memset(&info, 0, sizeof(info));
-
-        strcpy(info.comp_name, ENROLL_COMP);
-        strcpy(info.protocol, ENROLL_PROTO);
-        info.pref_version = 1;
-        info.pref_syntax  = PROTO_GPB;
-        info.addr         = 0;
-
-        if (connmgr_comp_init(COMPID_ENROLL, &info)) {
-                log_err("Failed to register with connmgr.");
-                return -1;
-        }
-
-        enroll.state = ENROLL_INIT;
-
-        return 0;
-}
-
-void enroll_fini(void)
-{
-        if (enroll.state == ENROLL_RUNNING)
-                pthread_join(enroll.listener, NULL);
-
-        connmgr_comp_fini(COMPID_ENROLL);
-}
-
-int enroll_start(void)
-{
-        if (pthread_create(&enroll.listener, NULL, enroll_handle, NULL))
-                return -1;
-
-        enroll.state = ENROLL_RUNNING;
-
-        return 0;
-}
-
-void enroll_stop(void)
-{
-        if (enroll.state == ENROLL_RUNNING)
-                pthread_cancel(enroll.listener);
-}
+#include "common/enroll.c"
diff --git a/src/ipcpd/unicast/main.c b/src/ipcpd/unicast/main.c
index 050b9229..96df1664 100644
--- a/src/ipcpd/unicast/main.c
+++ b/src/ipcpd/unicast/main.c
@@ -29,6 +29,7 @@
 #include "config.h"
 
 #define OUROBOROS_PREFIX "unicast-ipcp"
+#define THIS_TYPE IPCP_UNICAST
 
 #include <ouroboros/errno.h>
 #include <ouroboros/hash.h>
@@ -38,12 +39,12 @@
 #include <ouroboros/rib.h>
 #include <ouroboros/time_utils.h>
 
+#include "common/connmgr.h"
+#include "common/enroll.h"
 #include "addr_auth.h"
 #include "ca.h"
-#include "connmgr.h"
 #include "dir.h"
 #include "dt.h"
-#include "enroll.h"
 #include "fa.h"
 #include "ipcp.h"
 
@@ -54,8 +55,6 @@
 #include <assert.h>
 #include <inttypes.h>
 
-#define THIS_TYPE IPCP_UNICAST
-
 struct ipcp ipcpi;
 
 static int initialize_components(const struct ipcp_config * conf)
diff --git a/src/ipcpd/unicast/pol/link_state.c b/src/ipcpd/unicast/pol/link_state.c
index 18729a7c..e8983ec6 100644
--- a/src/ipcpd/unicast/pol/link_state.c
+++ b/src/ipcpd/unicast/pol/link_state.c
@@ -41,8 +41,8 @@
 #include <ouroboros/rib.h>
 #include <ouroboros/utils.h>
 
-#include "comp.h"
-#include "connmgr.h"
+#include "common/comp.h"
+#include "common/connmgr.h"
 #include "graph.h"
 #include "ipcp.h"
 #include "link_state.h"
diff --git a/src/ipcpd/unicast/psched.c b/src/ipcpd/unicast/psched.c
index facc495c..33ac5afe 100644
--- a/src/ipcpd/unicast/psched.c
+++ b/src/ipcpd/unicast/psched.c
@@ -31,9 +31,9 @@
 #include <ouroboros/errno.h>
 #include <ouroboros/notifier.h>
 
+#include "common/connmgr.h"
 #include "ipcp.h"
 #include "psched.h"
-#include "connmgr.h"
 
 #include <assert.h>
 #include <sched.h>