ipcpd: Allow specifying fixed syntax

This commits adds the functions and messages to specify a fixed
protocol syntax during CACEP. It also revises the messages for
specifying the DT protocol syntax from the irm tool.

20 files changed, 263 insertions, 285 deletions

diff --git a/include/ouroboros/CMakeLists.txt b/include/ouroboros/CMakeLists.txt
index f582b915..8f57d4d7 100644
--- a/include/ouroboros/CMakeLists.txt
+++ b/include/ouroboros/CMakeLists.txt
@@ -13,6 +13,7 @@ set(HEADER_FILES
   ipcp.h
   irm.h
   nsm.h
+  proto.h
   qos.h)
 
 install(FILES ${HEADER_FILES} DESTINATION usr/include/ouroboros)
diff --git a/include/ouroboros/cacep.h b/include/ouroboros/cacep.h
index 967151de..fb52fd0f 100644
--- a/include/ouroboros/cacep.h
+++ b/include/ouroboros/cacep.h
@@ -25,21 +25,19 @@
 #define OUROBOROS_CACEP_H
 
 #include <ouroboros/cdefs.h>
+#include <ouroboros/proto.h>
 
 #include <stdint.h>
-
-enum proto_concrete_syntax {
-        PROTO_GPB = 0,
-        PROTO_ASN_1,
-        PROTO_FIXED
-};
+#include <sys/types.h>
 
 struct conn_info {
         char                       ae_name[64];
         char                       protocol[64];
         uint32_t                   pref_version;
         enum proto_concrete_syntax pref_syntax;
-        uint64_t                   addr;
+        struct proto_field         fixed_conc_syntax[PROTO_MAX_FIELDS];
+        size_t                     num_fields;
+        uint64_t                   addr; /* AE-I name */
 };
 
 __BEGIN_DECLS
diff --git a/include/ouroboros/ipcp.h b/include/ouroboros/ipcp.h
index f418d640..05fdcd49 100644
--- a/include/ouroboros/ipcp.h
+++ b/include/ouroboros/ipcp.h
@@ -57,22 +57,22 @@ enum hash_algo {
         HASH_SHA3_512
 };
 
+#define DIF_NAME_SIZE 256
+
+struct dif_info {
+        char           dif_name[DIF_NAME_SIZE];
+        enum hash_algo dir_hash_algo;
+};
+
 struct ipcp_config {
-        char *             dif_name;
+        struct dif_info    dif_info;
+
         enum ipcp_type     type;
-        enum hash_algo     dir_hash_algo;
 
-        /* Normal DIF */
+        /* DT syntax */
         uint8_t            addr_size;
-        uint8_t            cep_id_size;
-        uint8_t            pdu_length_size;
-        uint8_t            seqno_size;
-
+        uint8_t            fd_size;
         bool               has_ttl;
-        bool               has_chk;
-
-        uint32_t           min_pdu_size;
-        uint32_t           max_pdu_size;
 
         enum pol_addr_auth addr_auth_type;
         enum pol_gam       dt_gam_type;
@@ -86,12 +86,4 @@ struct ipcp_config {
         char *             if_name;
 };
 
-#define DIF_NAME_SIZE 256
-
-/* capability report of a DIF */
-struct dif_info {
-        enum hash_algo algo;
-        char           dif_name[DIF_NAME_SIZE];
-};
-
 #endif /* OUROBOROS_IPCP_H */
diff --git a/include/ouroboros/proto.h b/include/ouroboros/proto.h
new file mode 100644
index 00000000..30c549c0
--- /dev/null
+++ b/include/ouroboros/proto.h
@@ -0,0 +1,44 @@
+/*
+ * Ouroboros - Copyright (C) 2016 - 2017
+ *
+ * Protocol syntax definitions
+ *
+ *    Dimitri Staessens <dimitri.staessens@ugent.be>
+ *    Sander Vrijders   <sander.vrijders@ugent.be>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * version 2.1 as published by the Free Software Foundation.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#ifndef OUROBOROS_PROTO_H
+#define OUROBOROS_PROTO_H
+
+#include <sys/types.h>
+
+#define PROTO_FIELD_ABSENT   -1
+#define PROTO_FIELD_VARIABLE  0
+#define PROTO_MAX_FIELDS      128
+
+enum proto_concrete_syntax {
+        PROTO_GPB = 0,
+        PROTO_ASN_1,
+        PROTO_FIXED
+};
+
+struct proto_field {
+        size_t  fid; /* an ID for the protocol field */
+        ssize_t len; /* 0 variable, -1 not present   */
+};
+
+#endif /* OUROBOROS_PROTO_H */
diff --git a/include/ouroboros/sockets.h b/include/ouroboros/sockets.h
index bb8f6d87..660709bf 100644
--- a/include/ouroboros/sockets.h
+++ b/include/ouroboros/sockets.h
@@ -28,6 +28,7 @@
 
 #include "ipcp_config.pb-c.h"
 typedef IpcpConfigMsg ipcp_config_msg_t;
+typedef DifInfoMsg dif_info_msg_t;
 
 #include "irmd_messages.pb-c.h"
 typedef IrmMsg irm_msg_t;
diff --git a/src/ipcpd/ipcp.c b/src/ipcpd/ipcp.c
index 7f3ebc73..4737b1cd 100644
--- a/src/ipcpd/ipcp.c
+++ b/src/ipcpd/ipcp.c
@@ -133,22 +133,21 @@ static void thread_exit(ssize_t id)
 
 static void * ipcp_main_loop(void * o)
 {
-        int     lsockfd;
-        uint8_t buf[IPCP_MSG_BUF_SIZE];
-
-        ipcp_msg_t * msg;
-        ssize_t      count;
-        buffer_t     buffer;
-        ipcp_msg_t   ret_msg = IPCP_MSG__INIT;
-
-        ipcp_config_msg_t * conf_msg;
+        int                 lsockfd;
+        uint8_t             buf[IPCP_MSG_BUF_SIZE];
+        ssize_t             count;
+        buffer_t            buffer;
         struct ipcp_config  conf;
         struct dif_info     info;
 
-        struct timeval ltv = {(SOCKET_TIMEOUT / 1000),
-                              (SOCKET_TIMEOUT % 1000) * 1000};
+        ipcp_config_msg_t * conf_msg;
+        ipcp_msg_t *        msg;
+        ipcp_msg_t          ret_msg  = IPCP_MSG__INIT;
+        dif_info_msg_t      dif_info = DIF_INFO_MSG__INIT;
+        struct timeval      ltv      = {(SOCKET_TIMEOUT / 1000),
+                                        (SOCKET_TIMEOUT % 1000) * 1000};
 
-        ssize_t id = (ssize_t)  o;
+        ssize_t             id       = (ssize_t)  o;
 
         while (true) {
 #ifdef __FreeBSD__
@@ -213,23 +212,19 @@ static void * ipcp_main_loop(void * o)
 
                         conf_msg = msg->conf;
                         conf.type = conf_msg->ipcp_type;
-                        conf.dir_hash_algo = conf_msg->dir_hash_algo;
-                        conf.dif_name = conf_msg->dif_name;
-                        if (conf.dif_name == NULL) {
+                        conf.dif_info.dir_hash_algo =
+                                conf_msg->dif_info->dir_hash_algo;
+                        strcpy(conf.dif_info.dif_name,
+                               conf_msg->dif_info->dif_name);
+                        if (conf.dif_info.dif_name == NULL) {
                                 ret_msg.has_result = true;
                                 ret_msg.result = -1;
                                 break;
                         }
                         if (conf_msg->ipcp_type == IPCP_NORMAL) {
                                 conf.addr_size = conf_msg->addr_size;
-                                conf.cep_id_size = conf_msg->cep_id_size;
-                                conf.pdu_length_size =
-                                        conf_msg->pdu_length_size;
-                                conf.seqno_size = conf_msg->seqno_size;
+                                conf.fd_size = conf_msg->fd_size;
                                 conf.has_ttl = conf_msg->has_ttl;
-                                conf.has_chk = conf_msg->has_chk;
-                                conf.min_pdu_size = conf_msg->min_pdu_size;
-                                conf.max_pdu_size = conf_msg->max_pdu_size;
                                 conf.addr_auth_type = conf_msg->addr_auth_type;
                                 conf.dt_gam_type = conf_msg->dt_gam_type;
                                 conf.rm_gam_type = conf_msg->rm_gam_type;
@@ -264,9 +259,9 @@ static void * ipcp_main_loop(void * o)
                                                                 &info);
 
                         if (ret_msg.result == 0) {
-                                ret_msg.has_dir_hash_algo = true;
-                                ret_msg.dir_hash_algo     = info.algo;
-                                ret_msg.dif_name          = info.dif_name;
+                                ret_msg.dif_info = &dif_info;
+                                dif_info.dir_hash_algo = info.dir_hash_algo;
+                                dif_info.dif_name      = info.dif_name;
                         }
                         break;
                 case IPCP_MSG_CODE__IPCP_REG:
diff --git a/src/ipcpd/local/main.c b/src/ipcpd/local/main.c
index 162ce4d9..6d89045c 100644
--- a/src/ipcpd/local/main.c
+++ b/src/ipcpd/local/main.c
@@ -119,7 +119,7 @@ static int ipcp_local_bootstrap(const struct ipcp_config * conf)
         assert(conf);
         assert(conf->type == THIS_TYPE);
 
-        ipcpi.dir_hash_algo = conf->dir_hash_algo;
+        ipcpi.dir_hash_algo = conf->dif_info.dir_hash_algo;
 
         ipcp_set_state(IPCP_OPERATIONAL);
 
diff --git a/src/ipcpd/normal/dt.h b/src/ipcpd/normal/dt.h
index b7b3f7c6..52760154 100644
--- a/src/ipcpd/normal/dt.h
+++ b/src/ipcpd/normal/dt.h
@@ -29,12 +29,6 @@
 
 #define INVALID_ADDR 0
 
-#define DT_PROTO "dt"
-#define FD_FA    1
-#define FD_DHT   2
-
-typedef uint32_t dt_cep_id_t;
-
 int  dt_init(void);
 
 void dt_fini(void);
diff --git a/src/ipcpd/normal/dt_pci.c b/src/ipcpd/normal/dt_pci.c
index 9f3b9a91..a4f99142 100644
--- a/src/ipcpd/normal/dt_pci.c
+++ b/src/ipcpd/normal/dt_pci.c
@@ -25,7 +25,6 @@
 #include <ouroboros/crc32.h>
 #include <ouroboros/rib.h>
 
-#include "dt_const.h"
 #include "dt_pci.h"
 #include "ribconfig.h"
 
@@ -33,16 +32,13 @@
 #include <string.h>
 #include <assert.h>
 
-#define PDU_TYPE_SIZE 1
-#define QC_SIZE       1
 #define DEFAULT_TTL   60
-#define TTL_SIZE      1
-#define CHK_SIZE      4
 
 struct {
-        struct dt_const dtc;
+        uint8_t         addr_size;
+        uint8_t         fd_size;
+        bool            has_ttl;
         size_t          head_size;
-        size_t          tail_size;
 
         /* offsets */
         size_t          qc_o;
@@ -50,29 +46,28 @@ struct {
         size_t          fd_o;
 } dt_pci_info;
 
-int dt_pci_init(void)
+int dt_pci_init()
 {
         /* read dt constants from the RIB */
         if (rib_read(BOOT_PATH "/dt/const/addr_size",
-                     &dt_pci_info.dtc.addr_size,
-                     sizeof(dt_pci_info.dtc.addr_size)) < 0 ||
+                     &dt_pci_info.addr_size,
+                     sizeof(dt_pci_info.addr_size)) < 0 ||
+            rib_read(BOOT_PATH "/dt/const/fd_size",
+                     &dt_pci_info.fd_size,
+                     sizeof(dt_pci_info.fd_size)) < 0 ||
             rib_read(BOOT_PATH "/dt/const/has_ttl",
-                     &dt_pci_info.dtc.has_ttl,
-                     sizeof(dt_pci_info.dtc.has_ttl)) < 0 ||
-            rib_read(BOOT_PATH "/dt/const/has_chk",
-                     &dt_pci_info.dtc.has_chk,
-                     sizeof(dt_pci_info.dtc.has_chk)) < 0)
+                     &dt_pci_info.has_ttl,
+                     sizeof(dt_pci_info.has_ttl)) < 0)
                 return -1;
 
-        dt_pci_info.qc_o = dt_pci_info.dtc.addr_size;
-        dt_pci_info.ttl_o = dt_pci_info.qc_o + QC_SIZE;
-        if (dt_pci_info.dtc.has_ttl)
-                dt_pci_info.fd_o = dt_pci_info.ttl_o + TTL_SIZE;
+        dt_pci_info.qc_o = dt_pci_info.addr_size;
+        dt_pci_info.ttl_o = dt_pci_info.qc_o + QOS_LEN;
+        if (dt_pci_info.has_ttl)
+                dt_pci_info.fd_o = dt_pci_info.ttl_o + TTL_LEN;
         else
                 dt_pci_info.fd_o = dt_pci_info.ttl_o;
 
-        dt_pci_info.head_size = dt_pci_info.fd_o + PDU_TYPE_SIZE;
-        dt_pci_info.tail_size = dt_pci_info.dtc.has_chk ? CHK_SIZE : 0;
+        dt_pci_info.head_size = dt_pci_info.fd_o + dt_pci_info.fd_size;
 
         return 0;
 }
@@ -85,7 +80,6 @@ int dt_pci_ser(struct shm_du_buff * sdb,
                struct dt_pci *      dt_pci)
 {
         uint8_t * head;
-        uint8_t * tail;
         uint8_t ttl = DEFAULT_TTL;
 
         assert(sdb);
@@ -96,22 +90,11 @@ int dt_pci_ser(struct shm_du_buff * sdb,
                 return -EPERM;
 
         /* FIXME: Add check and operations for Big Endian machines */
-        memcpy(head, &dt_pci->dst_addr, dt_pci_info.dtc.addr_size);
-        memcpy(head + dt_pci_info.qc_o, &dt_pci->qc, QC_SIZE);
-        if (dt_pci_info.dtc.has_ttl)
-                memcpy(head + dt_pci_info.ttl_o, &ttl, TTL_SIZE);
-        memcpy(head + dt_pci_info.fd_o, &dt_pci->fd, PDU_TYPE_SIZE);
-
-        if (dt_pci_info.dtc.has_chk) {
-                tail = shm_du_buff_tail_alloc(sdb, dt_pci_info.tail_size);
-                if (tail == NULL) {
-                        shm_du_buff_head_release(sdb, dt_pci_info.head_size);
-                        return -EPERM;
-                }
-
-                *((uint32_t *) tail) = 0;
-                crc32((uint32_t *) tail, head, tail - head);
-        }
+        memcpy(head, &dt_pci->dst_addr, dt_pci_info.addr_size);
+        memcpy(head + dt_pci_info.qc_o, &dt_pci->qc, QOS_LEN);
+        if (dt_pci_info.has_ttl)
+                memcpy(head + dt_pci_info.ttl_o, &ttl, TTL_LEN);
+        memcpy(head + dt_pci_info.fd_o, &dt_pci->fd, dt_pci_info.fd_size);
 
         return 0;
 }
@@ -127,17 +110,17 @@ void dt_pci_des(struct shm_du_buff * sdb,
         head = shm_du_buff_head(sdb);
 
         /* FIXME: Add check and operations for Big Endian machines */
-        memcpy(&dt_pci->dst_addr, head, dt_pci_info.dtc.addr_size);
-        memcpy(&dt_pci->qc, head + dt_pci_info.qc_o, QC_SIZE);
+        memcpy(&dt_pci->dst_addr, head, dt_pci_info.addr_size);
+        memcpy(&dt_pci->qc, head + dt_pci_info.qc_o, QOS_LEN);
 
-        if (dt_pci_info.dtc.has_ttl) {
+        if (dt_pci_info.has_ttl) {
                 --*(head + dt_pci_info.ttl_o); /* decrease TTL */
-                memcpy(&dt_pci->ttl, head + dt_pci_info.ttl_o, TTL_SIZE);
+                memcpy(&dt_pci->ttl, head + dt_pci_info.ttl_o, TTL_LEN);
         } else {
                 dt_pci->ttl = 1;
         }
 
-        memcpy(&dt_pci->fd, head + dt_pci_info.fd_o, PDU_TYPE_SIZE);
+        memcpy(&dt_pci->fd, head + dt_pci_info.fd_o, dt_pci_info.fd_size);
 }
 
 void dt_pci_shrink(struct shm_du_buff * sdb)
@@ -145,5 +128,4 @@ void dt_pci_shrink(struct shm_du_buff * sdb)
         assert(sdb);
 
         shm_du_buff_head_release(sdb, dt_pci_info.head_size);
-        shm_du_buff_tail_release(sdb, dt_pci_info.tail_size);
 }
diff --git a/src/ipcpd/normal/dt_pci.h b/src/ipcpd/normal/dt_pci.h
index 280956f4..13f782a4 100644
--- a/src/ipcpd/normal/dt_pci.h
+++ b/src/ipcpd/normal/dt_pci.h
@@ -24,8 +24,31 @@
 #define OUROBOROS_IPCPD_NORMAL_DT_PCI_H
 
 #include <ouroboros/shm_du_buff.h>
+#include <ouroboros/proto.h>
 #include <ouroboros/shared.h>
 
+#include <stdint.h>
+#include <stdbool.h>
+
+#define DT_PROTO "dt"
+#define FD_FA    1
+#define FD_DHT   2
+
+/* Abstract syntax */
+enum dtp_fields {
+        DTP_DST = 0,   /* DST ADDRESS */
+        DTP_QOS,       /* QOS ID      */
+        DTP_DFD,       /* DEST FD     */
+        DTP_TTL,       /* TTL FIELD   */
+        DTP_NUM_FIELDS /* number of fields */
+};
+
+/* Default field lengths */
+#define TTL_LEN 1
+#define QOS_LEN 1
+#define DFD_LEN 1
+#define DST_LEN 2
+
 struct dt_pci {
         uint64_t  dst_addr;
         qoscube_t qc;
diff --git a/src/ipcpd/normal/main.c b/src/ipcpd/normal/main.c
index d103b339..f9718041 100644
--- a/src/ipcpd/normal/main.c
+++ b/src/ipcpd/normal/main.c
@@ -229,7 +229,7 @@ static int normal_ipcp_enroll(const char *      dst,
 
         log_dbg("Enrolled with " HASH_FMT, HASH_VAL(dst));
 
-        info->algo = ipcpi.dir_hash_algo;
+        info->dir_hash_algo = ipcpi.dir_hash_algo;
 
         strcpy(info->dif_name, ipcpi.dif_name);
 
@@ -259,12 +259,8 @@ const struct ros {
         {BOOT_PATH "/dt/gam", "cacep"},
         {BOOT_PATH "/dt", "const"},
         {BOOT_PATH "/dt/const", "addr_size"},
-        {BOOT_PATH "/dt/const", "cep_id_size"},
-        {BOOT_PATH "/dt/const", "seqno_size"},
+        {BOOT_PATH "/dt/const", "fd_size"},
         {BOOT_PATH "/dt/const", "has_ttl"},
-        {BOOT_PATH "/dt/const", "has_chk"},
-        {BOOT_PATH "/dt/const", "min_pdu_size"},
-        {BOOT_PATH "/dt/const", "max_pdu_size"},
 
         /* RIB MGR COMPONENT */
         {BOOT_PATH, "rm"},
@@ -301,7 +297,7 @@ static int normal_ipcp_bootstrap(const struct ipcp_config * conf)
         assert(conf);
         assert(conf->type == THIS_TYPE);
 
-        hash_algo = hton32((uint32_t) conf->dir_hash_algo);
+        hash_algo = hton32((uint32_t) conf->dif_info.dir_hash_algo);
 
         assert(ntoh32(hash_algo) != 0);
 
@@ -311,32 +307,20 @@ static int normal_ipcp_bootstrap(const struct ipcp_config * conf)
         }
 
         if (rib_write(BOOT_PATH "/general/dif_name",
-                      conf->dif_name,
-                      strlen(conf->dif_name) + 1) ||
+                      conf->dif_info.dif_name,
+                      strlen(conf->dif_info.dif_name) + 1) ||
             rib_write(BOOT_PATH "/general/dir_hash_algo",
                       &hash_algo,
                       sizeof(hash_algo)) ||
             rib_write(BOOT_PATH "/dt/const/addr_size",
                       &conf->addr_size,
                       sizeof(conf->addr_size)) ||
-            rib_write(BOOT_PATH "/dt/const/cep_id_size",
-                      &conf->cep_id_size,
-                      sizeof(conf->cep_id_size)) ||
-            rib_write(BOOT_PATH "/dt/const/seqno_size",
-                      &conf->seqno_size,
-                      sizeof(conf->seqno_size)) ||
+            rib_write(BOOT_PATH "/dt/const/fd_size",
+                      &conf->fd_size,
+                      sizeof(conf->fd_size)) ||
             rib_write(BOOT_PATH "/dt/const/has_ttl",
                       &conf->has_ttl,
                       sizeof(conf->has_ttl)) ||
-            rib_write(BOOT_PATH "/dt/const/has_chk",
-                      &conf->has_chk,
-                      sizeof(conf->has_chk)) ||
-            rib_write(BOOT_PATH "/dt/const/min_pdu_size",
-                      &conf->min_pdu_size,
-                      sizeof(conf->min_pdu_size)) ||
-            rib_write(BOOT_PATH "/dt/const/max_pdu_size",
-                      &conf->max_pdu_size,
-                      sizeof(conf->max_pdu_size)) ||
             rib_write(BOOT_PATH "/dt/gam/type",
                       &conf->dt_gam_type,
                       sizeof(conf->dt_gam_type)) ||
@@ -355,7 +339,7 @@ static int normal_ipcp_bootstrap(const struct ipcp_config * conf)
                 return -1;
         }
 
-        log_dbg("Bootstrapped in DIF %s.", conf->dif_name);
+        log_dbg("Bootstrapped in DIF %s.", conf->dif_info.dif_name);
 
         return 0;
 }
diff --git a/src/ipcpd/shim-eth-llc/main.c b/src/ipcpd/shim-eth-llc/main.c
index 72889236..1696d0ad 100644
--- a/src/ipcpd/shim-eth-llc/main.c
+++ b/src/ipcpd/shim-eth-llc/main.c
@@ -758,7 +758,7 @@ static int eth_llc_ipcp_bootstrap(const struct ipcp_config * conf)
         assert(conf);
         assert(conf->type == THIS_TYPE);
 
-        ipcpi.dir_hash_algo = conf->dir_hash_algo;
+        ipcpi.dir_hash_algo = conf->dif_info.dir_hash_algo;
 
         if (conf->if_name == NULL) {
                 log_err("Interface name is NULL.");
diff --git a/src/ipcpd/shim-udp/main.c b/src/ipcpd/shim-udp/main.c
index a3e87b86..4ea0ad3d 100644
--- a/src/ipcpd/shim-udp/main.c
+++ b/src/ipcpd/shim-udp/main.c
@@ -534,7 +534,7 @@ static int ipcp_udp_bootstrap(const struct ipcp_config * conf)
         assert(conf);
         assert(conf->type == THIS_TYPE);
 
-        ipcpi.dir_hash_algo = conf->dir_hash_algo;
+        ipcpi.dir_hash_algo = conf->dif_info.dir_hash_algo;
 
         if (inet_ntop(AF_INET,
                       &conf->ip_addr,
diff --git a/src/irmd/ipcp.c b/src/irmd/ipcp.c
index 182970b1..28e91b18 100644
--- a/src/irmd/ipcp.c
+++ b/src/irmd/ipcp.c
@@ -241,14 +241,14 @@ int ipcp_enroll(pid_t             api,
                 return ret;
         }
 
-        if (!recv_msg->has_dir_hash_algo || recv_msg->dif_name == NULL) {
+        if (recv_msg->dif_info == NULL) {
                 ipcp_msg__free_unpacked(recv_msg, NULL);
                 return -EIPCP;
         }
 
-        info->algo = recv_msg->dir_hash_algo;
+        info->dir_hash_algo = recv_msg->dif_info->dir_hash_algo;
 
-        strcpy(info->dif_name, recv_msg->dif_name);
+        strcpy(info->dif_name, recv_msg->dif_info->dif_name);
 
         ipcp_msg__free_unpacked(recv_msg, NULL);
 
diff --git a/src/irmd/main.c b/src/irmd/main.c
index 3331c754..b3243192 100644
--- a/src/irmd/main.c
+++ b/src/irmd/main.c
@@ -423,19 +423,19 @@ static int bootstrap_ipcp(pid_t               api,
                 return -1;
         }
 
-        entry->dif_name = strdup(conf->dif_name);
+        entry->dif_name = strdup(conf->dif_info->dif_name);
         if (entry->dif_name == NULL) {
                 pthread_rwlock_unlock(&irmd.reg_lock);
                 log_warn("Failed to set name of DIF.");
                 return -ENOMEM;
         }
 
-        entry->dir_hash_algo = conf->dir_hash_algo;
+        entry->dir_hash_algo = conf->dif_info->dir_hash_algo;
 
         pthread_rwlock_unlock(&irmd.reg_lock);
 
         log_info("Bootstrapped IPCP %d in DIF %s.",
-                 entry->api, conf->dif_name);
+                 entry->api, conf->dif_info->dif_name);
 
         return 0;
 }
@@ -484,7 +484,7 @@ static int enroll_ipcp(pid_t  api,
                 return -ENOMEM;
         }
 
-        entry->dir_hash_algo = info.algo;
+        entry->dir_hash_algo = info.dir_hash_algo;
 
         pthread_rwlock_unlock(&irmd.reg_lock);
 
diff --git a/src/lib/cacep.proto b/src/lib/cacep.proto
index cdeaa0b7..8a159a35 100644
--- a/src/lib/cacep.proto
+++ b/src/lib/cacep.proto
@@ -23,12 +23,18 @@
 
 syntax = "proto2";
 
+message fixed_conc_syntax_msg {
+        repeated uint32 fids = 1;
+        repeated uint32 lens = 2;
+}
+
 message cacep_msg {
-        required string ae_name     = 1;
-        required string protocol    = 2;
-        required int32 pref_version = 3;
-        repeated int32 supp_version = 4;
-        required int32 pref_syntax  = 5;
-        repeated int32 supp_syntax  = 6;
-        required uint64 address     = 7;
+        required string ae_name                    = 1;
+        required string protocol                   = 2;
+        required int32 pref_version                = 3;
+        repeated int32 supp_version                = 4;
+        required int32 pref_syntax                 = 5;
+        repeated int32 supp_syntax                 = 6;
+        optional fixed_conc_syntax_msg syntax_spec = 7;
+        required uint64 address                    = 8;
 }
\ No newline at end of file
diff --git a/src/lib/ipcp_config.proto b/src/lib/ipcp_config.proto
index d5ff75d6..b6c8c303 100644
--- a/src/lib/ipcp_config.proto
+++ b/src/lib/ipcp_config.proto
@@ -23,25 +23,24 @@
 
 syntax = "proto2";
 
+message dif_info_msg {
+        required string dif_name      =  1;
+        required uint32 dir_hash_algo =  2;
+}
+
 message ipcp_config_msg {
-        required string dif_name        =  1;
-        required uint32 dir_hash_algo   =  2;
-        required int32 ipcp_type        =  3;
+        required dif_info_msg dif_info =  1;
+        required int32 ipcp_type       =  2;
         // Config for normal IPCP
-        optional uint32 addr_size       =  4;
-        optional uint32 cep_id_size     =  5;
-        optional uint32 pdu_length_size =  6;
-        optional uint32 seqno_size      =  7;
-        optional bool has_ttl           =  8;
-        optional bool has_chk           =  9;
-        optional uint32 min_pdu_size    = 10;
-        optional uint32 max_pdu_size    = 11;
-        optional uint32 addr_auth_type  = 12;
-        optional uint32 dt_gam_type     = 13;
-        optional uint32 rm_gam_type     = 14;
+        optional uint32 addr_size      =  3;
+        optional uint32 fd_size        =  4;
+        optional bool has_ttl          =  5;
+        optional uint32 addr_auth_type =  6;
+        optional uint32 dt_gam_type    =  7;
+        optional uint32 rm_gam_type    =  8;
         // Config for shim UDP
-        optional uint32 ip_addr         = 15;
-        optional uint32 dns_addr        = 16;
+        optional uint32 ip_addr        =  9;
+        optional uint32 dns_addr       = 10;
         // Config for the shim Ethernet LLC
-        optional string if_name         = 17;
-}
\ No newline at end of file
+        optional string if_name        = 11;
+}
diff --git a/src/lib/ipcpd_messages.proto b/src/lib/ipcpd_messages.proto
index 9299afcd..8a9ae214 100644
--- a/src/lib/ipcpd_messages.proto
+++ b/src/lib/ipcpd_messages.proto
@@ -38,16 +38,15 @@ enum ipcp_msg_code {
 };
 
 message ipcp_msg {
-        required ipcp_msg_code code   =  1;
-        optional string name          =  2;
-        optional bytes hash           =  3;
-        optional int32 port_id        =  4;
-        optional string dst_name      =  5;
-        optional uint32 qoscube       =  6;
-        optional ipcp_config_msg conf =  7;
-        optional int32 api            =  8;
-        optional int32 dir_hash_algo  =  9;
-        optional string dif_name      = 10;
-        optional int32 response       = 11;
-        optional int32 result         = 12;
+        required ipcp_msg_code code    =  1;
+        optional string name           =  2;
+        optional bytes hash            =  3;
+        optional int32 port_id         =  4;
+        optional string dst_name       =  5;
+        optional uint32 qoscube        =  6;
+        optional ipcp_config_msg conf  =  7;
+        optional int32 api             =  8;
+        optional dif_info_msg dif_info =  9;
+        optional int32 response        = 10;
+        optional int32 result          = 11;
 };
diff --git a/src/lib/irm.c b/src/lib/irm.c
index 12d8e8f7..d2f85bbf 100644
--- a/src/lib/irm.c
+++ b/src/lib/irm.c
@@ -93,6 +93,7 @@ int irm_bootstrap_ipcp(pid_t                      api,
 {
         irm_msg_t         msg      = IRM_MSG__INIT;
         ipcp_config_msg_t config   = IPCP_CONFIG_MSG__INIT;
+        dif_info_msg_t    dif_info = DIF_INFO_MSG__INIT;
         irm_msg_t *       recv_msg = NULL;
         int               ret      = -1;
 
@@ -103,42 +104,34 @@ int irm_bootstrap_ipcp(pid_t                      api,
         msg.has_api = true;
         msg.api     = api;
 
+        config.dif_info = &dif_info;
         msg.conf = &config;
-        config.dif_name = conf->dif_name;
+
+        dif_info.dif_name = (char *) conf->dif_info.dif_name;
+        dif_info.dir_hash_algo = conf->dif_info.dir_hash_algo;
+
         config.ipcp_type = conf->type;
-        config.dir_hash_algo = (enum hash_algo) conf->dir_hash_algo;
 
         switch (conf->type) {
         case IPCP_NORMAL:
-                config.has_addr_size = true;
-                config.has_cep_id_size = true;
-                config.has_pdu_length_size = true;
-                config.has_seqno_size = true;
-                config.has_has_ttl = true;
-                config.has_has_chk = true;
-                config.has_min_pdu_size = true;
-                config.has_max_pdu_size = true;
+                config.has_addr_size      = true;
+                config.addr_size          = conf->addr_size;
+                config.has_fd_size        = true;
+                config.fd_size            = conf->fd_size;
+                config.has_has_ttl        = true;
+                config.has_ttl            = conf->has_ttl;
                 config.has_addr_auth_type = true;
-                config.has_dt_gam_type = true;
-                config.has_rm_gam_type = true;
-
-                config.addr_size = conf->addr_size;
-                config.cep_id_size = conf->cep_id_size;
-                config.pdu_length_size = conf->pdu_length_size;
-                config.seqno_size = conf->seqno_size;
-                config.has_ttl = conf->has_ttl;
-                config.has_chk = conf->has_chk;
-                config.min_pdu_size = conf->min_pdu_size;
-                config.max_pdu_size = conf->max_pdu_size;
-                config.addr_auth_type = conf->addr_auth_type;
-                config.dt_gam_type = conf->dt_gam_type;
-                config.rm_gam_type = conf->rm_gam_type;
+                config.addr_auth_type     = conf->addr_auth_type;
+                config.has_dt_gam_type    = true;
+                config.dt_gam_type        = conf->dt_gam_type;
+                config.has_rm_gam_type    = true;
+                config.rm_gam_type        = conf->rm_gam_type;
                 break;
         case IPCP_SHIM_UDP:
-                config.has_ip_addr = true;
-                config.ip_addr = conf->ip_addr;
+                config.has_ip_addr  = true;
+                config.ip_addr      = conf->ip_addr;
                 config.has_dns_addr = true;
-                config.dns_addr = conf->dns_addr;
+                config.dns_addr     = conf->dns_addr;
                 break;
         case IPCP_LOCAL:
                 break;
diff --git a/src/tools/irm/irm_ipcp_bootstrap.c b/src/tools/irm/irm_ipcp_bootstrap.c
index 32c09b55..44fdfb3d 100644
--- a/src/tools/irm/irm_ipcp_bootstrap.c
+++ b/src/tools/irm/irm_ipcp_bootstrap.c
@@ -34,34 +34,30 @@
 #include "irm_ops.h"
 #include "irm_utils.h"
 
-#define NORMAL               "normal"
-#define SHIM_UDP             "shim-udp"
-#define SHIM_ETH_LLC         "shim-eth-llc"
-#define LOCAL                "local"
-
-#define CRC32                "CRC32"
-#define MD5                  "MD5"
-#define SHA3_224             "SHA3_224"
-#define SHA3_256             "SHA3_256"
-#define SHA3_384             "SHA3_384"
-#define SHA3_512             "SHA3_512"
-
-#define DEFAULT_HASH_ALGO    HASH_SHA3_256
-#define DEFAULT_HASH_STR     SHA3_256
-#define DEFAULT_ADDR_SIZE    4
-#define DEFAULT_CEP_ID_SIZE  2
-#define DEFAULT_PDU_LEN_SIZE 2
-#define DEFAULT_SEQ_NO_SIZE  4
-#define DEFAULT_MIN_PDU_SIZE 0
-#define DEFAULT_MAX_PDU_SIZE 9000
-#define DEFAULT_DDNS         0
-#define DEFAULT_ADDR_AUTH    FLAT_RANDOM
-#define DEFAULT_DT_GAM       COMPLETE
-#define DEFAULT_RM_GAM       COMPLETE
-#define ADDR_AUTH_FLAT       "flat"
-
-#define DT_GAM_COMPLETE      "complete"
-#define RM_GAM_COMPLETE      "complete"
+#define NORMAL            "normal"
+#define SHIM_UDP          "shim-udp"
+#define SHIM_ETH_LLC      "shim-eth-llc"
+#define LOCAL             "local"
+
+#define CRC32             "CRC32"
+#define MD5               "MD5"
+#define SHA3_224          "SHA3_224"
+#define SHA3_256          "SHA3_256"
+#define SHA3_384          "SHA3_384"
+#define SHA3_512          "SHA3_512"
+
+#define DEFAULT_HASH_ALGO HASH_SHA3_256
+#define DEFAULT_HASH_STR  SHA3_256
+#define DEFAULT_ADDR_SIZE 4
+#define DEFAULT_FD_SIZE   2
+#define DEFAULT_DDNS      0
+#define DEFAULT_ADDR_AUTH FLAT_RANDOM
+#define DEFAULT_DT_GAM    COMPLETE
+#define DEFAULT_RM_GAM    COMPLETE
+#define ADDR_AUTH_FLAT    "flat"
+
+#define DT_GAM_COMPLETE   "complete"
+#define RM_GAM_COMPLETE   "complete"
 
 static void usage(void)
 {
@@ -77,13 +73,8 @@ static void usage(void)
                SHA3_224 " " SHA3_256 " " SHA3_384 " " SHA3_512 "}.\n\n"
                "if TYPE == " NORMAL "\n"
                "                [addr <address size> (default: %d)]\n"
-               "                [cep_id <CEP-id size> (default: %d)]\n"
-               "                [pdu_len <PDU length size> (default: %d)]\n"
-               "                [seqno <sequence number size> (default: %d)]\n"
+               "                [fd <fd size> (default: %d)]\n"
                "                [ttl <add time to live value in the PCI>]\n"
-               "                [chk <add 32-bit checksum in the PCI>]\n"
-               "                [min_pdu <minimum PDU size> (default: %d)]\n"
-               "                [max_pdu <maximum PDU size> (default: %d)]\n"
                "                [addr_auth <address policy> (default: %s)]\n"
                "                [dt_gam <data transfer graph adjacency manager>"
                " (default: %s)]\n"
@@ -95,37 +86,30 @@ static void usage(void)
                " (default = none: %d)]\n"
                "if TYPE == " SHIM_ETH_LLC "\n"
                "                if_name <interface name>\n",
-               DEFAULT_HASH_STR, DEFAULT_ADDR_SIZE, DEFAULT_CEP_ID_SIZE,
-               DEFAULT_PDU_LEN_SIZE, DEFAULT_SEQ_NO_SIZE,
-               DEFAULT_MIN_PDU_SIZE, DEFAULT_MAX_PDU_SIZE,
+               DEFAULT_HASH_STR, DEFAULT_ADDR_SIZE, DEFAULT_FD_SIZE,
                ADDR_AUTH_FLAT, DT_GAM_COMPLETE, RM_GAM_COMPLETE, DEFAULT_DDNS);
 }
 
 int do_bootstrap_ipcp(int argc, char ** argv)
 {
-        char *             name            = NULL;
-        char *             hash            = DEFAULT_HASH_STR;
+        char *             name           = NULL;
+        char *             hash           = DEFAULT_HASH_STR;
         pid_t              api;
         struct ipcp_config conf;
-        uint8_t            addr_size       = DEFAULT_ADDR_SIZE;
-        uint8_t            cep_id_size     = DEFAULT_CEP_ID_SIZE;
-        uint8_t            pdu_length_size = DEFAULT_PDU_LEN_SIZE;
-        uint8_t            seqno_size      = DEFAULT_SEQ_NO_SIZE;
-        bool               has_ttl         = false;
-        bool               has_chk         = false;
-        uint32_t           min_pdu_size    = DEFAULT_MIN_PDU_SIZE;
-        uint32_t           max_pdu_size    = DEFAULT_MAX_PDU_SIZE;
-        enum pol_addr_auth addr_auth_type  = DEFAULT_ADDR_AUTH;
-        enum pol_gam       dt_gam_type     = DEFAULT_DT_GAM;
-        enum pol_gam       rm_gam_type     = DEFAULT_RM_GAM;
-        uint32_t           ip_addr         = 0;
-        uint32_t           dns_addr        = DEFAULT_DDNS;
-        char *             ipcp_type       = NULL;
-        char *             dif_name        = NULL;
-        char *             if_name         = NULL;
-        pid_t *            apis            = NULL;
-        ssize_t            len             = 0;
-        int                i               = 0;
+        uint8_t            addr_size      = DEFAULT_ADDR_SIZE;
+        uint8_t            fd_size        = DEFAULT_FD_SIZE;
+        bool               has_ttl        = false;
+        enum pol_addr_auth addr_auth_type = DEFAULT_ADDR_AUTH;
+        enum pol_gam       dt_gam_type    = DEFAULT_DT_GAM;
+        enum pol_gam       rm_gam_type    = DEFAULT_RM_GAM;
+        uint32_t           ip_addr        = 0;
+        uint32_t           dns_addr       = DEFAULT_DDNS;
+        char *             ipcp_type      = NULL;
+        char *             dif_name       = NULL;
+        char *             if_name        = NULL;
+        pid_t *            apis           = NULL;
+        ssize_t            len            = 0;
+        int                i              = 0;
 
         while (argc > 0) {
                 if (matches(*argv, "type") == 0) {
@@ -150,24 +134,12 @@ int do_bootstrap_ipcp(int argc, char ** argv)
                         if_name = *(argv + 1);
                 } else if (matches(*argv, "addr") == 0) {
                         addr_size = atoi(*(argv + 1));
-                } else if (matches(*argv, "cep_id") == 0) {
-                        cep_id_size = atoi(*(argv + 1));
-                } else if (matches(*argv, "pdu_len") == 0) {
-                        pdu_length_size = atoi(*(argv + 1));
-                } else if (matches(*argv, "seqno") == 0) {
-                        seqno_size = atoi(*(argv + 1));
+                } else if (matches(*argv, "fd") == 0) {
+                        fd_size = atoi(*(argv + 1));
                 } else if (matches(*argv, "ttl") == 0) {
                         has_ttl = true;
                         argc++;
                         argv--;
-                } else if (matches(*argv, "chk") == 0) {
-                        has_chk = true;
-                        argc++;
-                        argv--;
-                } else if (matches(*argv, "min_pdu") == 0) {
-                        min_pdu_size = atoi(*(argv + 1));
-                } else if (matches(*argv, "max_pdu") == 0) {
-                        max_pdu_size = atoi(*(argv + 1));
                 } else if (matches(*argv, "addr_auth") == 0) {
                         if (strcmp(ADDR_AUTH_FLAT, *(argv + 1)) == 0)
                                 addr_auth_type = FLAT_RANDOM;
@@ -192,20 +164,20 @@ int do_bootstrap_ipcp(int argc, char ** argv)
                 return -1;
         }
 
-        conf.dif_name = dif_name;
+        strcpy(conf.dif_info.dif_name, dif_name);
 
         if (strcmp(hash, CRC32) == 0) {
-                conf.dir_hash_algo = HASH_CRC32;
+                conf.dif_info.dir_hash_algo = HASH_CRC32;
         } else if (strcmp(hash, MD5) == 0) {
-                conf.dir_hash_algo = HASH_MD5;
+                conf.dif_info.dir_hash_algo = HASH_MD5;
         } else if (strcmp(hash, SHA3_224) == 0) {
-                conf.dir_hash_algo = HASH_SHA3_224;
+                conf.dif_info.dir_hash_algo = HASH_SHA3_224;
         } else if (strcmp(hash, SHA3_256) == 0) {
-                conf.dir_hash_algo = HASH_SHA3_256;
+                conf.dif_info.dir_hash_algo = HASH_SHA3_256;
         } else if (strcmp(hash, SHA3_384) == 0) {
-                conf.dir_hash_algo = HASH_SHA3_384;
+                conf.dif_info.dir_hash_algo = HASH_SHA3_384;
         } else if (strcmp(hash, SHA3_512) == 0) {
-                conf.dir_hash_algo = HASH_SHA3_512;
+                conf.dif_info.dir_hash_algo = HASH_SHA3_512;
         } else {
                 usage();
                 return -1;
@@ -214,13 +186,8 @@ int do_bootstrap_ipcp(int argc, char ** argv)
         if (strcmp(ipcp_type, NORMAL) == 0) {
                 conf.type = IPCP_NORMAL;
                 conf.addr_size = addr_size;
-                conf.cep_id_size = cep_id_size;
-                conf.pdu_length_size = pdu_length_size;
-                conf.seqno_size = seqno_size;
+                conf.fd_size = fd_size;
                 conf.has_ttl = has_ttl;
-                conf.has_chk = has_chk;
-                conf.min_pdu_size = min_pdu_size;
-                conf.max_pdu_size = max_pdu_size;
                 conf.addr_auth_type = addr_auth_type;
                 conf.dt_gam_type = dt_gam_type;
                 conf.rm_gam_type = rm_gam_type;