transient messages added; code cleanup

7 files changed, 796 insertions, 578 deletions

diff --git a/ecp/src/core.c b/ecp/src/core.c
index 51f2849..a0f1bdb 100644
--- a/ecp/src/core.c
+++ b/ecp/src/core.c
@@ -8,15 +8,18 @@
 #include "ht.h"
 #endif
 
-int ecp_dhkey_generate(ECPContext *ctx, ECPDHKey *key) {
+int ecp_ctx_init(ECPContext *ctx) {
     int rv;
 
-    if (ctx->rng == NULL) return ECP_ERR_RNG;
+    if (ctx == NULL) return ECP_ERR;
 
-    rv = ecp_cr_dh_mkpair(&key->public, &key->private, ctx->rng);
+    memset(ctx, 0, sizeof(ECPContext));
+
+    rv = ecp_tr_init(ctx);
+    if (rv) return rv;
+    rv = ecp_tm_init(ctx);
     if (rv) return rv;
 
-    key->valid = 1;
     return ECP_OK;
 }
 
@@ -35,18 +38,35 @@ int ecp_node_init(ECPNode *node, ecp_dh_public_t *public, void *addr) {
     return ECP_OK;
 }
 
-int ecp_ctx_init(ECPContext *ctx) {
-    int rv;
+int ecp_seq_item_init(ECPSeqItem *seq_item) {
+    memset(seq_item, 0, sizeof(ECPSeqItem));
 
-    if (ctx == NULL) return ECP_ERR;
+    return ECP_OK;
+}
 
-    memset(ctx, 0, sizeof(ECPContext));
+int ecp_frag_iter_init(ECPFragIter *iter, unsigned char *buffer, size_t buf_size) {
+    memset(iter, 0, sizeof(ECPFragIter));
+    iter->buffer = buffer;
+    iter->buf_size = buf_size;
 
-    rv = ecp_tr_init(ctx);
-    if (rv) return rv;
-    rv = ecp_tm_init(ctx);
+    return ECP_OK;
+}
+
+void ecp_frag_iter_reset(ECPFragIter *iter) {
+    iter->content_size = 0;
+    iter->seq = 0;
+    iter->frag_cnt = 0;
+}
+
+int ecp_dhkey_gen(ECPContext *ctx, ECPDHKey *key) {
+    int rv;
+
+    if (ctx->rng == NULL) return ECP_ERR_RNG;
+
+    rv = ecp_cr_dh_mkpair(&key->public, &key->private, ctx->rng);
     if (rv) return rv;
 
+    key->valid = 1;
     return ECP_OK;
 }
 
@@ -182,9 +202,10 @@ int ecp_sock_create(ECPSocket *sock, ECPContext *ctx, ECPDHKey *key) {
     sock->poll_timeout = ECP_POLL_TIMEOUT;
     sock->key_curr = 0;
     if (key) sock->key_perma = *key;
-    sock->conn_new = ecp_conn_handle_new;
+    sock->handler[ECP_MTYPE_OPEN] = ecp_sock_handle_open;
+    sock->handler[ECP_MTYPE_KGET] = ecp_sock_handle_kget;
 
-    rv = ecp_dhkey_generate(sock->ctx, &sock->key[sock->key_curr]);
+    rv = ecp_dhkey_gen(sock->ctx, &sock->key[sock->key_curr]);
     if (!rv) rv = ctable_create(&sock->conn, sock->ctx);
 
     if (rv) return rv;
@@ -247,7 +268,7 @@ int ecp_sock_dhkey_new(ECPSocket *sock) {
     ECPDHKey new_key;
     int rv;
 
-    rv = ecp_dhkey_generate(sock->ctx, &new_key);
+    rv = ecp_dhkey_gen(sock->ctx, &new_key);
     if (rv) return rv;
 
 #ifdef ECP_WITH_PTHREAD
@@ -329,7 +350,6 @@ static int conn_dhkey_new_pub_local(ECPConnection *conn, unsigned char idx) {
     return ECP_OK;
 }
 
-
 static int conn_dhkey_new_pub_remote(ECPConnection *conn, unsigned char idx, unsigned char *public) {
     // We obtained remote key
     ECPSocket *sock = conn->sock;
@@ -434,6 +454,26 @@ static int conn_shsec_set(ECPConnection *conn, unsigned char s_idx, unsigned cha
     return ECP_OK;
 }
 
+int ecp_conn_init(ECPConnection *conn, ECPNode *node) {
+    ECPDHKey key;
+    ECPContext *ctx = conn->sock->ctx;
+    int rv;
+
+    if (node == NULL) return ECP_ERR;
+
+    conn->out = 1;
+    conn->node = *node;
+    rv = ecp_dhkey_gen(ctx, &key);
+    if (!rv) rv = ctx->rng(conn->nonce, ECP_AEAD_SIZE_NONCE);
+    if (!rv) rv = ctx->rng(&conn->seq_out, sizeof(conn->seq_out));
+
+    if (!rv) rv = conn_dhkey_new_pair(conn, &key);
+    if (!rv) rv = conn_dhkey_new_pub_local(conn, conn->key_curr);
+    if (!rv) rv = ecp_conn_register(conn);
+
+    return rv;
+}
+
 int ecp_conn_create(ECPConnection *conn, ECPSocket *sock, unsigned char ctype) {
     int i, rv;
 
@@ -505,40 +545,6 @@ void ecp_conn_unregister(ECPConnection *conn) {
 #endif
 }
 
-static ssize_t _conn_send_kget(ECPConnection *conn, ECPTimerItem *ti) {
-    ECPBuffer packet;
-    ECPBuffer payload;
-    unsigned char pkt_buf[ECP_SIZE_PKT_BUF(0, ECP_MTYPE_KGET_REQ, conn)];
-    unsigned char pld_buf[ECP_SIZE_PLD_BUF(0, ECP_MTYPE_KGET_REQ, conn)];
-    packet.buffer = pkt_buf;
-    packet.size = ECP_SIZE_PKT_BUF(0, ECP_MTYPE_KGET_REQ, conn);
-    payload.buffer = pld_buf;
-    payload.size = ECP_SIZE_PLD_BUF(0, ECP_MTYPE_KGET_REQ, conn);
-
-    ecp_pld_set_type(pld_buf, ECP_MTYPE_KGET_REQ);
-    return ecp_pld_send_ll(conn, &packet, ECP_ECDH_IDX_PERMA, ECP_ECDH_IDX_INV, &payload, ECP_SIZE_PLD(0, ECP_MTYPE_KGET_REQ), 0, ti);
-}
-
-int ecp_conn_init(ECPConnection *conn, ECPNode *node) {
-    ECPDHKey key;
-    ECPContext *ctx = conn->sock->ctx;
-    int rv;
-
-    if (node == NULL) return ECP_ERR;
-
-    conn->out = 1;
-    conn->node = *node;
-    rv = ecp_dhkey_generate(ctx, &key);
-    if (!rv) rv = ctx->rng(conn->nonce, ECP_AEAD_SIZE_NONCE);
-    if (!rv) rv = ctx->rng(&conn->seq_out, sizeof(conn->seq_out));
-
-    if (!rv) rv = conn_dhkey_new_pair(conn, &key);
-    if (!rv) rv = conn_dhkey_new_pub_local(conn, conn->key_curr);
-    if (!rv) rv = ecp_conn_register(conn);
-
-    return rv;
-}
-
 int ecp_conn_open(ECPConnection *conn, ECPNode *node) {
     int rv;
     ssize_t _rv;
@@ -546,7 +552,7 @@ int ecp_conn_open(ECPConnection *conn, ECPNode *node) {
     rv = ecp_conn_init(conn, node);
     if (rv) return rv;
 
-    _rv = ecp_timer_send(conn, _conn_send_kget, ECP_MTYPE_KGET_REP, 3, 500);
+    _rv = ecp_conn_send_kget(conn);
     if (_rv < 0) {
         ecp_conn_unregister(conn);
         return _rv;
@@ -606,7 +612,7 @@ int ecp_conn_reset(ECPConnection *conn) {
     int rv;
     int i;
 
-    rv = ecp_dhkey_generate(ctx, &key);
+    rv = ecp_dhkey_gen(ctx, &key);
     if (rv) return rv;
 
 #ifdef ECP_WITH_PTHREAD
@@ -650,94 +656,149 @@ int ecp_conn_handler_init(ECPConnHandler *handler) {
     return ECP_OK;
 }
 
+int ecp_conn_dhkey_new(ECPConnection *conn) {
+    ECPSocket *sock = conn->sock;
+    ECPDHKey new_key;
+    int rv;
+    ssize_t _rv;
+
+    rv = ecp_dhkey_gen(sock->ctx, &new_key);
+    if (rv) return rv;
+
+#ifdef ECP_WITH_PTHREAD
+    pthread_mutex_lock(&sock->conn.mutex);
+    pthread_mutex_lock(&conn->mutex);
+#endif
+    rv = conn_dhkey_new_pair(conn, &new_key);
+#ifdef ECP_WITH_PTHREAD
+    pthread_mutex_unlock(&conn->mutex);
+    pthread_mutex_unlock(&sock->conn.mutex);
+#endif
+
+    if (rv) return rv;
+
+    _rv = ecp_conn_send_kput(conn);
+    if (_rv < 0) return _rv;
+
+    return ECP_OK;
+}
+
+int ecp_conn_dhkey_new_pub(ECPConnection *conn, unsigned char idx, unsigned char *public) {
+    ECPSocket *sock = conn->sock;
+    int rv;
+
+    if (conn == NULL) return ECP_ERR;
+    if (public == NULL) return ECP_ERR;
+
+#ifdef ECP_WITH_PTHREAD
+    pthread_mutex_lock(&sock->conn.mutex);
+    pthread_mutex_lock(&conn->mutex);
+#endif
+    rv = conn_dhkey_new_pub_remote(conn, idx, public);
+#ifdef ECP_WITH_PTHREAD
+    pthread_mutex_unlock(&conn->mutex);
+    pthread_mutex_unlock(&sock->conn.mutex);
+#endif
+    if (rv == ECP_ERR_ECDH_KEY_DUP) rv = ECP_OK;
+
+    return rv;
+}
+
+int ecp_conn_dhkey_get_curr(ECPConnection *conn, unsigned char *idx, unsigned char *public) {
+    unsigned char _idx;
+    ECPSocket *sock = conn->sock;
+
+#ifdef ECP_WITH_PTHREAD
+    pthread_mutex_lock(&conn->mutex);
+#endif
+
+    _idx = conn->key_curr;
+    if (_idx != ECP_ECDH_IDX_INV) ecp_cr_dh_pub_to_buf(public, &conn->key[_idx].public);
+
+#ifdef ECP_WITH_PTHREAD
+    pthread_mutex_unlock(&conn->mutex);
+#endif
+
+    if (_idx == ECP_ECDH_IDX_INV) return ecp_sock_dhkey_get_curr(sock, idx, public);
+
+    if (idx) *idx = _idx;
+    return ECP_OK;
+}
+
 static ssize_t _conn_send_open(ECPConnection *conn, ECPTimerItem *ti) {
     ECPBuffer packet;
     ECPBuffer payload;
     unsigned char pkt_buf[ECP_SIZE_PKT_BUF(1, ECP_MTYPE_OPEN_REQ, conn)];
     unsigned char pld_buf[ECP_SIZE_PLD_BUF(1, ECP_MTYPE_OPEN_REQ, conn)];
-    unsigned char *buf = ecp_pld_get_buf(pld_buf, ECP_MTYPE_OPEN_REQ);
+    unsigned char *buf;
 
     packet.buffer = pkt_buf;
     packet.size = ECP_SIZE_PKT_BUF(1, ECP_MTYPE_OPEN_REQ, conn);
     payload.buffer = pld_buf;
     payload.size = ECP_SIZE_PLD_BUF(1, ECP_MTYPE_OPEN_REQ, conn);
 
-    ecp_pld_set_type(pld_buf, ECP_MTYPE_OPEN_REQ);
+    ecp_pld_set_type(payload.buffer, payload.size, ECP_MTYPE_OPEN_REQ);
+    buf = ecp_pld_get_buf(payload.buffer, payload.size);
     buf[0] = conn->type;
 
     return ecp_pld_send_wtimer(conn, &packet, &payload, ECP_SIZE_PLD(1, ECP_MTYPE_OPEN_REQ), 0, ti);
 }
 
-ssize_t ecp_conn_send_open(ECPConnection *conn) {
-    return ecp_timer_send(conn, _conn_send_open, ECP_MTYPE_OPEN_REP, 3, 500);
-}
-
-int ecp_conn_handle_new(ECPSocket *sock, ECPConnection *parent, unsigned char *payload, size_t payload_size, ECPConnection **_conn) {
-    ECPConnection *conn = NULL;
-    ecp_conn_create_t handle_create = NULL;
-    ecp_conn_destroy_t handle_destroy = NULL;
-    unsigned char ctype = 0;
-    int rv;
+static ssize_t _conn_send_kget(ECPConnection *conn, ECPTimerItem *ti) {
+    ECPBuffer packet;
+    ECPBuffer payload;
+    unsigned char pkt_buf[ECP_SIZE_PKT_BUF(0, ECP_MTYPE_KGET_REQ, conn)];
+    unsigned char pld_buf[ECP_SIZE_PLD_BUF(0, ECP_MTYPE_KGET_REQ, conn)];
 
-    if (payload_size < 1) return ECP_ERR;
+    packet.buffer = pkt_buf;
+    packet.size = ECP_SIZE_PKT_BUF(0, ECP_MTYPE_KGET_REQ, conn);
+    payload.buffer = pld_buf;
+    payload.size = ECP_SIZE_PLD_BUF(0, ECP_MTYPE_KGET_REQ, conn);
 
-    ctype = payload[0];
+    ecp_pld_set_type(payload.buffer, payload.size, ECP_MTYPE_KGET_REQ);
+    return _ecp_pld_send(conn, &packet, ECP_ECDH_IDX_PERMA, ECP_ECDH_IDX_INV, NULL, &payload, ECP_SIZE_PLD(0, ECP_MTYPE_KGET_REQ), 0, ti);
+}
 
-    conn = sock->ctx->conn_alloc ? sock->ctx->conn_alloc(ctype) : NULL;
-    if (conn == NULL) return ECP_ERR_ALLOC;
+static ssize_t _conn_send_kput(ECPConnection *conn, ECPTimerItem *ti) {
+    ECPBuffer packet;
+    ECPBuffer payload;
+    unsigned char pkt_buf[ECP_SIZE_PKT_BUF(ECP_ECDH_SIZE_KEY+1, ECP_MTYPE_KPUT_REQ, conn)];
+    unsigned char pld_buf[ECP_SIZE_PLD_BUF(ECP_ECDH_SIZE_KEY+1, ECP_MTYPE_KPUT_REQ, conn)];
+    unsigned char *buf;
+    int rv;
 
-    rv = ecp_conn_create(conn, sock, ctype);
-    if (rv) {
-        if (sock->ctx->conn_free) sock->ctx->conn_free(conn);
-        return rv;
-    }
-    rv = sock->ctx->rng(&conn->seq_out, sizeof(conn->seq_out));
-    if (rv) {
-        ecp_conn_destroy(conn);
-        if (sock->ctx->conn_free) sock->ctx->conn_free(conn);
-        return rv;
-    }
+    packet.buffer = pkt_buf;
+    packet.size = ECP_SIZE_PKT_BUF(ECP_ECDH_SIZE_KEY+1, ECP_MTYPE_KPUT_REQ, conn);
+    payload.buffer = pld_buf;
+    payload.size = ECP_SIZE_PLD_BUF(ECP_ECDH_SIZE_KEY+1, ECP_MTYPE_KPUT_REQ, conn);
 
-    conn->refcount = 1;
-    conn->parent = parent;
-    conn->pcount = parent ? parent->pcount+1 : 0;
-    handle_create = conn->sock->ctx->handler[conn->type] ? conn->sock->ctx->handler[conn->type]->conn_create : NULL;
-    handle_destroy = conn->sock->ctx->handler[conn->type] ? conn->sock->ctx->handler[conn->type]->conn_destroy : NULL;
+    ecp_pld_set_type(payload.buffer, payload.size, ECP_MTYPE_KPUT_REQ);
+    buf = ecp_pld_get_buf(payload.buffer, payload.size);
+    rv = ecp_conn_dhkey_get_curr(conn, buf, buf+1);
+    if (rv) return rv;
 
-    if (handle_create) rv = handle_create(conn, payload+1, payload_size-1);
-    if (rv) {
-        ecp_conn_destroy(conn);
-        if (sock->ctx->conn_free) sock->ctx->conn_free(conn);
-        return rv;
-    }
+    return ecp_pld_send_wtimer(conn, &packet, &payload, ECP_SIZE_PLD(ECP_ECDH_SIZE_KEY+1, ECP_MTYPE_KPUT_REQ), 0, ti);
+}
 
-    rv = ecp_conn_register(conn);
-    if (rv) {
-        if (handle_destroy) handle_destroy(conn);
-        ecp_conn_destroy(conn);
-        if (sock->ctx->conn_free) sock->ctx->conn_free(conn);
-        return rv;
-    }
+ssize_t ecp_conn_send_open(ECPConnection *conn) {
+    return ecp_timer_send(conn, _conn_send_open, ECP_MTYPE_OPEN_REP, 3, 500);
+}
 
-    if (parent) {
-#ifdef ECP_WITH_PTHREAD
-        pthread_mutex_lock(&parent->mutex);
-#endif
-        parent->refcount++;
-#ifdef ECP_WITH_PTHREAD
-        pthread_mutex_unlock(&parent->mutex);
-#endif
-    }
+ssize_t ecp_conn_send_kget(ECPConnection *conn) {
+    return ecp_timer_send(conn, _conn_send_kget, ECP_MTYPE_KGET_REP, 3, 500);
+}
 
-    *_conn = conn;
-    return rv;
+ssize_t ecp_conn_send_kput(ECPConnection *conn) {
+    return ecp_timer_send(conn, _conn_send_kput, ECP_MTYPE_KPUT_REP, 3, 500);
 }
 
 ssize_t ecp_conn_handle_open(ECPConnection *conn, ecp_seq_t seq, unsigned char mtype, unsigned char *msg, ssize_t size, ECP2Buffer *b) {
+    int is_open;
+
 #ifdef ECP_WITH_PTHREAD
     pthread_mutex_lock(&conn->mutex);
 #endif
-    int is_open = ecp_conn_is_open(conn);
+    is_open = ecp_conn_is_open(conn);
     if (!is_open && (size >= 0)) conn->flags |= ECP_CONN_FLAG_OPEN;
 #ifdef ECP_WITH_PTHREAD
     pthread_mutex_unlock(&conn->mutex);
@@ -774,7 +835,7 @@ ssize_t ecp_conn_handle_open(ECPConnection *conn, ecp_seq_t seq, unsigned char m
         payload.size = ECP_SIZE_PLD_BUF(0, ECP_MTYPE_OPEN_REP, conn);
 
         ctype = msg[0];
-        ecp_pld_set_type(pld_buf, ECP_MTYPE_OPEN_REP);
+        ecp_pld_set_type(payload.buffer, payload.size, ECP_MTYPE_OPEN_REP);
         _rv = ecp_pld_send(conn, &packet, &payload, ECP_SIZE_PLD(0, ECP_MTYPE_OPEN_REP), 0);
 
         return 1;
@@ -786,13 +847,14 @@ ssize_t ecp_conn_handle_kget(ECPConnection *conn, ecp_seq_t seq, unsigned char m
     if (mtype & ECP_MTYPE_FLAG_REP) {
         ECPContext *ctx = conn->sock->ctx;
         int rv;
+        int is_open;
 
         if (!conn->out) return ECP_ERR;
 
 #ifdef ECP_WITH_PTHREAD
         pthread_mutex_lock(&conn->mutex);
 #endif
-        int is_open = ecp_conn_is_open(conn);
+        is_open = ecp_conn_is_open(conn);
 #ifdef ECP_WITH_PTHREAD
         pthread_mutex_unlock(&conn->mutex);
 #endif
@@ -826,7 +888,7 @@ ssize_t ecp_conn_handle_kget(ECPConnection *conn, ecp_seq_t seq, unsigned char m
         ECPBuffer payload;
         unsigned char pkt_buf[ECP_SIZE_PKT_BUF(ECP_ECDH_SIZE_KEY+1, ECP_MTYPE_KGET_REP, conn)];
         unsigned char pld_buf[ECP_SIZE_PLD_BUF(ECP_ECDH_SIZE_KEY+1, ECP_MTYPE_KGET_REP, conn)];
-        unsigned char *buf = ecp_pld_get_buf(pld_buf, 0);
+        unsigned char *buf;
         int rv;
         ssize_t _rv;
 
@@ -835,7 +897,9 @@ ssize_t ecp_conn_handle_kget(ECPConnection *conn, ecp_seq_t seq, unsigned char m
         payload.buffer = pld_buf;
         payload.size = ECP_SIZE_PLD_BUF(ECP_ECDH_SIZE_KEY+1, ECP_MTYPE_KGET_REP, conn);
 
-        ecp_pld_set_type(pld_buf, ECP_MTYPE_KGET_REP);
+        ecp_pld_set_type(payload.buffer, payload.size, ECP_MTYPE_KGET_REP);
+        buf= ecp_pld_get_buf(payload.buffer, payload.size);
+
         rv = ecp_conn_dhkey_get_curr(conn, buf, buf+1);
         if (rv) return rv;
         _rv = ecp_pld_send(conn, &packet, &payload, ECP_SIZE_PLD(ECP_ECDH_SIZE_KEY+1, ECP_MTYPE_KGET_REP), 0);
@@ -870,7 +934,7 @@ ssize_t ecp_conn_handle_kput(ECPConnection *conn, ecp_seq_t seq, unsigned char m
         rv = ecp_conn_dhkey_new_pub(conn, msg[0], msg+1);
         if (rv) return rv;
 
-        ecp_pld_set_type(pld_buf, ECP_MTYPE_KPUT_REP);
+        ecp_pld_set_type(payload.buffer, payload.size, ECP_MTYPE_KPUT_REP);
         _rv = ecp_pld_send(conn, &packet, &payload, ECP_SIZE_PLD(0, ECP_MTYPE_KPUT_REP), 0);
 
         return ECP_ECDH_SIZE_KEY+1;
@@ -878,7 +942,9 @@ ssize_t ecp_conn_handle_kput(ECPConnection *conn, ecp_seq_t seq, unsigned char m
     return ECP_ERR;
 }
 
-/* Memory limited version: */
+#ifdef ECP_MEM_TINY
+/* Memory limited version */
+
 ssize_t ecp_conn_handle_exec(ECPConnection *conn, ecp_seq_t seq, unsigned char mtype, unsigned char *msg, ssize_t size, ECP2Buffer *b) {
     if (size < 0) return size;
     if (b == NULL) return ECP_ERR;
@@ -888,8 +954,8 @@ ssize_t ecp_conn_handle_exec(ECPConnection *conn, ecp_seq_t seq, unsigned char m
     return ecp_pkt_handle(conn->sock, NULL, conn, b, size);
 }
 
-/* Non memory limited version: */
-/*
+#else
+
 ssize_t ecp_conn_handle_exec(ECPConnection *conn, ecp_seq_t seq, unsigned char mtype, unsigned char *msg, ssize_t size, ECP2Buffer *b) {
     if (size < 0) return size;
     if (b == NULL) return ECP_ERR;
@@ -909,134 +975,192 @@ ssize_t ecp_conn_handle_exec(ECPConnection *conn, ecp_seq_t seq, unsigned char m
 
     return ecp_pkt_handle(conn->sock, NULL, conn, &b2, size);
 }
-*/
 
-static ssize_t _conn_send_kput(ECPConnection *conn, ECPTimerItem *ti) {
-    ECPBuffer packet;
-    ECPBuffer payload;
-    unsigned char pkt_buf[ECP_SIZE_PKT_BUF(ECP_ECDH_SIZE_KEY+1, ECP_MTYPE_KPUT_REQ, conn)];
-    unsigned char pld_buf[ECP_SIZE_PLD_BUF(ECP_ECDH_SIZE_KEY+1, ECP_MTYPE_KPUT_REQ, conn)];
-    unsigned char *buf = ecp_pld_get_buf(pld_buf, ECP_MTYPE_KPUT_REQ);
-    int rv;
+#endif
 
-    packet.buffer = pkt_buf;
-    packet.size = ECP_SIZE_PKT_BUF(ECP_ECDH_SIZE_KEY+1, ECP_MTYPE_KPUT_REQ, conn);
-    payload.buffer = pld_buf;
-    payload.size = ECP_SIZE_PLD_BUF(ECP_ECDH_SIZE_KEY+1, ECP_MTYPE_KPUT_REQ, conn);
+ssize_t ecp_conn_handle_msg(ECPConnection *conn, ecp_seq_t seq, unsigned char *msg, size_t msg_size, ECP2Buffer *bufs) {
+    ecp_conn_handler_msg_t handler = NULL;
+    unsigned char mtype = 0;
+    unsigned char *content = NULL;
+    size_t rem_size = msg_size;
+    ssize_t rv;
+    int _rv;
 
-    ecp_pld_set_type(pld_buf, ECP_MTYPE_KPUT_REQ);
-    rv = ecp_conn_dhkey_get_curr(conn, buf, buf+1);
-    if (rv) return rv;
+    while (rem_size) {
+        _rv = ecp_msg_get_type(msg, rem_size, &mtype);
+        if (_rv) return ECP_ERR_MIN_MSG;
+        if ((mtype & ECP_MTYPE_MASK) >= ECP_MAX_MTYPE) return ECP_ERR_MAX_MTYPE;
 
-    return ecp_pld_send_wtimer(conn, &packet, &payload, ECP_SIZE_PLD(ECP_ECDH_SIZE_KEY+1, ECP_MTYPE_KPUT_REQ), 0, ti);
+        ecp_timer_pop(conn, mtype);
+
+        if (mtype & ECP_MTYPE_FLAG_FRAG) {
+#ifdef ECP_WITH_RBUF
+            if (conn->rbuf.recv && conn->rbuf.recv->frag_iter) {
+                _rv = ecp_msg_defrag(conn->rbuf.recv->frag_iter, seq, mtype, msg, msg_size, &msg, &rem_size);
+                if (_rv == ECP_ITER_NEXT) break;
+                if (_rv < 0) return _rv;
+            } else {
+                return ECP_ERR_ITER;
+            }
+#endif
+        }
+
+        content = ecp_msg_get_content(msg, rem_size);
+        if (content == NULL) return ECP_ERR_MIN_MSG;
+        rem_size -= content - msg;
+
+        handler = conn->sock->ctx->handler[conn->type] ? conn->sock->ctx->handler[conn->type]->msg[mtype & ECP_MTYPE_MASK] : NULL;
+        if (handler) {
+            rv = handler(conn, seq, mtype, content, rem_size, bufs);
+            if (rv < 0) return rv;
+            if (rv > rem_size) return ECP_ERR;
+            if (mtype & ECP_MTYPE_FLAG_FRAG) break;
+
+            rem_size -= rv;
+            msg = content + rv;
+        } else {
+            return msg_size - rem_size - 1;
+        }
+    }
+
+    return msg_size;
 }
 
-int ecp_conn_dhkey_new(ECPConnection *conn) {
-    ECPSocket *sock = conn->sock;
-    ECPDHKey new_key;
+int ecp_sock_handle_open(ECPSocket *sock, ECPNetAddr *addr, ECPConnection *parent, unsigned char *msg, size_t msg_size, ECPPktMeta *pkt_meta, ECP2Buffer *bufs, ECPConnection **_conn) {
+    ECPConnection *conn = NULL;
+    ecp_conn_create_t handle_create = NULL;
+    ecp_conn_destroy_t handle_destroy = NULL;
+    unsigned char ctype;
+    unsigned char c_idx = pkt_meta->c_idx;
+    unsigned char s_idx = pkt_meta->s_idx;
     int rv;
-    ssize_t _rv;
 
-    rv = ecp_dhkey_generate(sock->ctx, &new_key);
-    if (rv) return rv;
+    if (msg_size < 1) return ECP_ERR;
 
-#ifdef ECP_WITH_PTHREAD
-    pthread_mutex_lock(&sock->conn.mutex);
-    pthread_mutex_lock(&conn->mutex);
-#endif
-    rv = conn_dhkey_new_pair(conn, &new_key);
-#ifdef ECP_WITH_PTHREAD
-    pthread_mutex_unlock(&conn->mutex);
-    pthread_mutex_unlock(&sock->conn.mutex);
-#endif
+    ctype = msg[0];
 
-    if (rv) return rv;
+    conn = sock->ctx->conn_alloc ? sock->ctx->conn_alloc(ctype) : NULL;
+    if (conn == NULL) return ECP_ERR_ALLOC;
 
-    _rv = ecp_timer_send(conn, _conn_send_kput, ECP_MTYPE_KPUT_REP, 3, 500);
-    if (_rv < 0) return _rv;
+    rv = ecp_conn_create(conn, sock, ctype);
+    if (rv) {
+        if (sock->ctx->conn_free) sock->ctx->conn_free(conn);
+        return rv;
+    }
+    rv = sock->ctx->rng(&conn->seq_out, sizeof(conn->seq_out));
+    if (rv) {
+        ecp_conn_destroy(conn);
+        if (sock->ctx->conn_free) sock->ctx->conn_free(conn);
+        return rv;
+    }
 
-    return ECP_OK;
-}
+    conn->refcount = 1;
+    conn->parent = parent;
+    conn->pcount = parent ? parent->pcount+1 : 0;
+    handle_create = conn->sock->ctx->handler[conn->type] ? conn->sock->ctx->handler[conn->type]->conn_create : NULL;
+    handle_destroy = conn->sock->ctx->handler[conn->type] ? conn->sock->ctx->handler[conn->type]->conn_destroy : NULL;
 
-int ecp_conn_dhkey_new_pub(ECPConnection *conn, unsigned char idx, unsigned char *public) {
-    ECPSocket *sock = conn->sock;
-    int rv;
+    if (handle_create) rv = handle_create(conn, msg+1, msg_size-1);
+    if (rv) {
+        ecp_conn_destroy(conn);
+        if (sock->ctx->conn_free) sock->ctx->conn_free(conn);
+        return rv;
+    }
 
-    if (conn == NULL) return ECP_ERR;
-    if (public == NULL) return ECP_ERR;
+    rv = conn_dhkey_new_pub_remote(conn, c_idx, ecp_cr_dh_pub_get_buf(&pkt_meta->public));
+    if (rv) {
+        ecp_conn_destroy(conn);
+        if (sock->ctx->conn_free) sock->ctx->conn_free(conn);
+        return rv;
+    }
 
+    rv = ecp_conn_register(conn);
+    if (rv) {
+        if (handle_destroy) handle_destroy(conn);
+        ecp_conn_destroy(conn);
+        if (sock->ctx->conn_free) sock->ctx->conn_free(conn);
+        return rv;
+    }
+
+    if (parent) {
 #ifdef ECP_WITH_PTHREAD
-    pthread_mutex_lock(&sock->conn.mutex);
-    pthread_mutex_lock(&conn->mutex);
+        pthread_mutex_lock(&parent->mutex);
 #endif
-    rv = conn_dhkey_new_pub_remote(conn, idx, public);
+        parent->refcount++;
 #ifdef ECP_WITH_PTHREAD
-    pthread_mutex_unlock(&conn->mutex);
-    pthread_mutex_unlock(&sock->conn.mutex);
+        pthread_mutex_unlock(&parent->mutex);
 #endif
-    if (rv == ECP_ERR_ECDH_KEY_DUP) rv = ECP_OK;
+    }
 
-    return rv;
+    *_conn = conn;
+    return ECP_OK;
 }
 
-int ecp_conn_dhkey_get_curr(ECPConnection *conn, unsigned char *idx, unsigned char *public) {
-    unsigned char _idx;
-    ECPSocket *sock = conn->sock;
+int ecp_sock_handle_kget(ECPSocket *sock, ECPNetAddr *addr, ECPConnection *parent, unsigned char *msg, size_t msg_size, ECPPktMeta *pkt_meta, ECP2Buffer *bufs, ECPConnection **_conn) {
+    ECPBuffer _packet;
+    ECPBuffer _payload;
+    unsigned char pkt_buf[ECP_SIZE_PKT_BUF_TR(ECP_ECDH_SIZE_KEY+1, ECP_MTYPE_KGET_REP, parent)];
+    unsigned char pld_buf[ECP_SIZE_PLD_BUF_TR(ECP_ECDH_SIZE_KEY+1, ECP_MTYPE_KGET_REP, parent)];
+    unsigned char *buf;
+    int rv;
+    ssize_t _rv;
 
-#ifdef ECP_WITH_PTHREAD
-    pthread_mutex_lock(&conn->mutex);
-#endif
+    _packet.buffer = pkt_buf;
+    _packet.size = ECP_SIZE_PKT_BUF_TR(ECP_ECDH_SIZE_KEY+1, ECP_MTYPE_KGET_REP, parent);
+    _payload.buffer = pld_buf;
+    _payload.size = ECP_SIZE_PLD_BUF_TR(ECP_ECDH_SIZE_KEY+1, ECP_MTYPE_KGET_REP, parent);
 
-    _idx = conn->key_curr;
-    if (_idx != ECP_ECDH_IDX_INV) ecp_cr_dh_pub_to_buf(public, &conn->key[_idx].public);
+    ecp_pld_set_type(_payload.buffer, _payload.size, ECP_MTYPE_KGET_REP);
+    buf = ecp_pld_get_buf(_payload.buffer, _payload.size);
 
-#ifdef ECP_WITH_PTHREAD
-    pthread_mutex_unlock(&conn->mutex);
-#endif
+    rv = ecp_sock_dhkey_get_curr(sock, buf, buf+1);
+    if (rv) return rv;
 
-    if (_idx == ECP_ECDH_IDX_INV) return ecp_sock_dhkey_get_curr(sock, idx, public);
+    _rv = ecp_pld_send_tr(sock, addr, parent, &_packet, pkt_meta, &_payload, ECP_SIZE_PLD(ECP_ECDH_SIZE_KEY+1, ECP_MTYPE_KGET_REP), 0);
+    if (_rv < 0) return _rv;
 
-    if (idx) *idx = _idx;
     return ECP_OK;
 }
 
-ssize_t ecp_pkt_pack(ECPContext *ctx, unsigned char *packet, size_t pkt_size, unsigned char s_idx, unsigned char c_idx, ecp_dh_public_t *public, ecp_aead_key_t *shsec, unsigned char *nonce, ecp_seq_t seq, unsigned char *payload, size_t pld_size) {
+
+ssize_t _ecp_pack(ECPContext *ctx, unsigned char *packet, size_t pkt_size, ECPPktMeta *pkt_meta, unsigned char *payload, size_t pld_size) {
     ssize_t rv;
+    unsigned char s_idx, c_idx;
 
     if (pkt_size < ECP_SIZE_PKT_HDR) return ECP_ERR;
 
     // ECP_SIZE_PROTO
     packet[0] = 0;
     packet[1] = 0;
-    s_idx = s_idx & 0x0F;
-    c_idx = c_idx & 0x0F;
+    s_idx = pkt_meta->s_idx & 0x0F;
+    c_idx = pkt_meta->c_idx & 0x0F;
     packet[ECP_SIZE_PROTO] = (s_idx << 4) | c_idx;
-    ecp_cr_dh_pub_to_buf(packet+ECP_SIZE_PROTO+1, public);
-    memcpy(packet+ECP_SIZE_PROTO+1+ECP_ECDH_SIZE_KEY, nonce, ECP_AEAD_SIZE_NONCE);
-
-    payload[0] = (seq & 0xFF000000) >> 24;
-    payload[1] = (seq & 0x00FF0000) >> 16;
-    payload[2] = (seq & 0x0000FF00) >> 8;
-    payload[3] = (seq & 0x000000FF);
-    rv = ecp_cr_aead_enc(packet+ECP_SIZE_PKT_HDR, pkt_size-ECP_SIZE_PKT_HDR, payload, pld_size, shsec, nonce);
+    ecp_cr_dh_pub_to_buf(packet+ECP_SIZE_PROTO+1, &pkt_meta->public);
+    memcpy(packet+ECP_SIZE_PROTO+1+ECP_ECDH_SIZE_KEY, pkt_meta->nonce, ECP_AEAD_SIZE_NONCE);
+
+    payload[0] = (pkt_meta->seq & 0xFF000000) >> 24;
+    payload[1] = (pkt_meta->seq & 0x00FF0000) >> 16;
+    payload[2] = (pkt_meta->seq & 0x0000FF00) >> 8;
+    payload[3] = (pkt_meta->seq & 0x000000FF);
+    rv = ecp_cr_aead_enc(packet+ECP_SIZE_PKT_HDR, pkt_size-ECP_SIZE_PKT_HDR, payload, pld_size, &pkt_meta->shsec, pkt_meta->nonce);
     if (rv < 0) return ECP_ERR_ENCRYPT;
 
-    memcpy(nonce, packet+ECP_SIZE_PKT_HDR, ECP_AEAD_SIZE_NONCE);
+    memcpy(pkt_meta->nonce, packet+ECP_SIZE_PKT_HDR, ECP_AEAD_SIZE_NONCE);
 
     return rv+ECP_SIZE_PKT_HDR;
 }
 
-ssize_t ecp_pkt_pack_raw(ECPSocket *sock, ECPConnection *parent, unsigned char *packet, size_t pkt_size, unsigned char s_idx, unsigned char c_idx, ecp_dh_public_t *public, ecp_aead_key_t *shsec, unsigned char *nonce, ecp_seq_t seq, unsigned char *payload, size_t pld_size, ECPNetAddr *addr) {
-    ECPContext *ctx = sock->ctx;
+#ifndef ECP_WITH_VCONN
+ssize_t ecp_pack(ECPContext *ctx, ECPConnection *parent, ECPBuffer *packet, ECPPktMeta *pkt_meta, ECPBuffer *payload, size_t pld_size, ECPNetAddr *addr) {
+    if ((packet == NULL) || (packet->buffer == NULL)) return ECP_ERR;
+    if ((payload == NULL) || (payload->buffer == NULL)) return ECP_ERR;
 
-    return ecp_pkt_pack(ctx, packet, pkt_size, s_idx, c_idx, public, shsec, nonce, seq, payload, pld_size);
+    return _ecp_pack(ctx, packet->buffer, packet->size, pkt_meta, payload->buffer, pld_size);
 }
+#endif
 
-ssize_t ecp_conn_pack(ECPConnection *conn, unsigned char *packet, size_t pkt_size, unsigned char s_idx, unsigned char c_idx, unsigned char *payload, size_t pld_size, ECPSeqItem *si, ECPNetAddr *addr) {
-    ecp_aead_key_t shsec;
-    ecp_dh_public_t public;
-    ecp_seq_t _seq;
-    unsigned char nonce[ECP_AEAD_SIZE_NONCE];
+ssize_t _ecp_pack_conn(ECPConnection *conn, unsigned char *packet, size_t pkt_size, unsigned char s_idx, unsigned char c_idx, ECPSeqItem *si, unsigned char *payload, size_t pld_size, ECPNetAddr *addr) {
+    ECPPktMeta pkt_meta;
     int rv;
     ssize_t _rv;
 
@@ -1057,35 +1181,40 @@ ssize_t ecp_conn_pack(ECPConnection *conn, unsigned char *packet, size_t pkt_siz
             if (conn->remote.key_curr != ECP_ECDH_IDX_INV) c_idx = conn->remote.key[conn->remote.key_curr].idx;
         }
     }
-    rv = conn_shsec_get(conn, s_idx, c_idx, &shsec);
-    if (!rv) memcpy(nonce, conn->nonce, sizeof(nonce));
+    rv = conn_shsec_get(conn, s_idx, c_idx, &pkt_meta.shsec);
+    if (!rv) memcpy(pkt_meta.nonce, conn->nonce, sizeof(pkt_meta.nonce));
     if (!rv) {
         if (conn->out) {
             ECPDHKey *key = conn_dhkey_get(conn, c_idx);
 
             if ((key == NULL) || !key->valid) rv = ECP_ERR_ECDH_IDX;
-            if (!rv) memcpy(&public, &key->public, sizeof(public));
+            if (!rv) memcpy(&pkt_meta.public, &key->public, sizeof(pkt_meta.public));
         } else {
-            memcpy(&public, &conn->remote.key[conn->remote.key_curr].public, sizeof(public));
+            memcpy(&pkt_meta.public, &conn->remote.key[conn->remote.key_curr].public, sizeof(pkt_meta.public));
         }
     }
     if (!rv) {
         if (si) {
             if (si->seq_w) {
-                _seq = si->seq;
+                pkt_meta.seq = si->seq;
             } else {
-                _seq = conn->seq_out + 1;
-                si->seq = _seq;
+                pkt_meta.seq = conn->seq_out + 1;
+                si->seq = pkt_meta.seq;
             }
 
 #ifdef ECP_WITH_RBUF
-            if (conn->rbuf.send) rv = ecp_rbuf_pkt_prep(conn->rbuf.send, si, ecp_pld_get_type(payload));
+            if (conn->rbuf.send) {
+                unsigned char mtype;
+
+                rv = ecp_pld_get_type(payload, pld_size, &mtype);
+                if (!rv) rv = ecp_rbuf_pkt_prep(conn->rbuf.send, si, mtype);
+            }
 #endif
 
-            if (!rv && !si->seq_w) conn->seq_out = _seq;
+            if (!rv && !si->seq_w) conn->seq_out = pkt_meta.seq;
         } else {
-            _seq = conn->seq_out + 1;
-            conn->seq_out = _seq;
+            pkt_meta.seq = conn->seq_out + 1;
+            conn->seq_out = pkt_meta.seq;
         }
         if (!rv && addr) *addr = conn->node.addr;
     }
@@ -1096,13 +1225,15 @@ ssize_t ecp_conn_pack(ECPConnection *conn, unsigned char *packet, size_t pkt_siz
 
     if (rv) return rv;
 
-    _rv = ecp_pkt_pack(conn->sock->ctx, packet, pkt_size, s_idx, c_idx, &public, &shsec, nonce, _seq, payload, pld_size);
+    pkt_meta.s_idx = s_idx;
+    pkt_meta.c_idx = c_idx;
+    _rv = _ecp_pack(conn->sock->ctx, packet, pkt_size, &pkt_meta, payload, pld_size);
     if (_rv < 0) return _rv;
 
 #ifdef ECP_WITH_PTHREAD
     pthread_mutex_lock(&conn->mutex);
 #endif
-    memcpy(conn->nonce, nonce, sizeof(conn->nonce));
+    memcpy(conn->nonce, pkt_meta.nonce, sizeof(conn->nonce));
 #ifdef ECP_WITH_PTHREAD
     pthread_mutex_unlock(&conn->mutex);
 #endif
@@ -1111,18 +1242,11 @@ ssize_t ecp_conn_pack(ECPConnection *conn, unsigned char *packet, size_t pkt_siz
 }
 
 #ifndef ECP_WITH_VCONN
-ssize_t ecp_pack(ECPConnection *conn, ECPBuffer *packet, unsigned char s_idx, unsigned char c_idx, ECPBuffer *payload, size_t pld_size, ECPSeqItem *si, ECPNetAddr *addr) {
+ssize_t ecp_pack_conn(ECPConnection *conn, ECPBuffer *packet, unsigned char s_idx, unsigned char c_idx, ECPSeqItem *si, ECPBuffer *payload, size_t pld_size, ECPNetAddr *addr) {
     if ((packet == NULL) || (packet->buffer == NULL)) return ECP_ERR;
     if ((payload == NULL) || (payload->buffer == NULL)) return ECP_ERR;
 
-    return ecp_conn_pack(conn, packet->buffer, packet->size, s_idx, c_idx, payload->buffer, pld_size, si, addr);
-}
-
-ssize_t ecp_pack_raw(ECPSocket *sock, ECPConnection *parent, ECPBuffer *packet, unsigned char s_idx, unsigned char c_idx, ecp_dh_public_t *public, ecp_aead_key_t *shsec, unsigned char *nonce, ecp_seq_t seq, ECPBuffer *payload, size_t pld_size, ECPNetAddr *addr) {
-    if ((packet == NULL) || (packet->buffer == NULL)) return ECP_ERR;
-    if ((payload == NULL) || (payload->buffer == NULL)) return ECP_ERR;
-
-    return ecp_pkt_pack_raw(sock, parent, packet->buffer, packet->size, s_idx, c_idx, public, shsec, nonce, seq, payload->buffer, pld_size, addr);
+    return _ecp_pack_conn(conn, packet->buffer, packet->size, s_idx, c_idx, si, payload->buffer, pld_size, addr);
 }
 #endif
 
@@ -1132,18 +1256,22 @@ ssize_t ecp_unpack(ECPSocket *sock, ECPNetAddr *addr, ECPConnection *parent, ECP
     unsigned char l_idx = ECP_ECDH_IDX_INV;
     unsigned char *payload = bufs->payload->buffer;
     unsigned char *packet = bufs->packet->buffer;
+    size_t pld_size = bufs->payload->size;
+    ssize_t dec_size;
     ecp_aead_key_t shsec;
     ecp_dh_public_t public;
     ecp_dh_private_t private;
+    unsigned char *public_buf;
+    unsigned char *nonce;
+    unsigned char nonce_next[ECP_AEAD_SIZE_NONCE];
     ECPConnection *conn = NULL;
     ECPDHKey *key = NULL;
+    unsigned char mtype;
     unsigned char is_open = 0;
-    unsigned char is_new = 0;
-    unsigned char seq_check = 1;
-    unsigned char seq_reset = 0;
-    ecp_seq_t seq_c, seq_p, seq_n;
+    unsigned char seq_check;
+    unsigned char seq_reset;
+    ecp_seq_t seq_pkt, seq_conn, seq_last;
     ecp_ack_t seq_map;
-    ssize_t dec_size;
     int rv = ECP_OK;
 
     *_conn = NULL;
@@ -1152,11 +1280,14 @@ ssize_t ecp_unpack(ECPSocket *sock, ECPNetAddr *addr, ECPConnection *parent, ECP
     s_idx = (packet[ECP_SIZE_PROTO] & 0xF0) >> 4;
     c_idx = (packet[ECP_SIZE_PROTO] & 0x0F);
 
+    public_buf = packet+ECP_SIZE_PROTO+1;
+    nonce = packet+ECP_SIZE_PROTO+1+ECP_ECDH_SIZE_KEY;
+
 #ifdef ECP_WITH_PTHREAD
     pthread_mutex_lock(&sock->conn.mutex);
 #endif
 
-    conn = ctable_search(sock, c_idx, packet+ECP_SIZE_PROTO+1, NULL);
+    conn = ctable_search(sock, c_idx, public_buf, NULL);
     if (conn && !conn->out && (s_idx == ECP_ECDH_IDX_PERMA)) conn = NULL;
 
 #ifdef ECP_WITH_PTHREAD
@@ -1188,7 +1319,7 @@ ssize_t ecp_unpack(ECPSocket *sock, ECPNetAddr *addr, ECPConnection *parent, ECP
         conn->refcount++;
         is_open = ecp_conn_is_open(conn);
         if (is_open) {
-            seq_c = conn->seq_in;
+            seq_conn = conn->seq_in;
             seq_map = conn->seq_in_map;
         }
     }
@@ -1200,73 +1331,73 @@ ssize_t ecp_unpack(ECPSocket *sock, ECPNetAddr *addr, ECPConnection *parent, ECP
     if (rv) return rv;
 
     if (key) {
-        ecp_cr_dh_pub_from_buf(&public, packet+ECP_SIZE_PROTO+1);
+        ecp_cr_dh_pub_from_buf(&public, public_buf);
         ecp_cr_dh_shsec(&shsec, &public, &private);
         memset(&private, 0, sizeof(private));
     }
 
-    dec_size = ecp_cr_aead_dec(payload, bufs->payload->size, packet+ECP_SIZE_PKT_HDR, pkt_size-ECP_SIZE_PKT_HDR, &shsec, packet+ECP_SIZE_PROTO+1+ECP_ECDH_SIZE_KEY);
+    dec_size = ecp_cr_aead_dec(payload, pld_size, packet+ECP_SIZE_PKT_HDR, pkt_size-ECP_SIZE_PKT_HDR, &shsec, nonce);
     if (dec_size < ECP_SIZE_PLD_HDR+1) rv = ECP_ERR_DECRYPT;
     if (rv) goto ecp_unpack_err;
 
-    seq_p = \
+    seq_pkt = \
         (payload[0] << 24) | \
         (payload[1] << 16) | \
         (payload[2] << 8)  | \
         (payload[3]);
 
-    if ((payload[ECP_SIZE_PLD_HDR] & ECP_MTYPE_MASK) < ECP_MAX_MTYPE_SYS) ecp_tr_release(bufs->packet, 1);
+    mtype = payload[ECP_SIZE_PLD_HDR];
+    memcpy(nonce_next, packet+ECP_SIZE_PKT_HDR, sizeof(nonce_next));
+    // XXX!
+    // if ((mtype & ECP_MTYPE_MASK) < ECP_MAX_MTYPE_SYS) ecp_tr_release(bufs->packet, 1);
     if (conn == NULL) {
-        if (payload[ECP_SIZE_PLD_HDR] == ECP_MTYPE_OPEN_REQ) {
-            is_new = 1;
-            rv = sock->conn_new(sock, parent, payload+ECP_SIZE_PLD_HDR+1, dec_size-ECP_SIZE_PLD_HDR-1, &conn);
-            if (rv) return rv;
-        } else if (payload[ECP_SIZE_PLD_HDR] == ECP_MTYPE_KGET_REQ) {
-            ECPBuffer _packet;
-            ECPBuffer _payload;
-            unsigned char pkt_buf[ECP_SIZE_PKT_RAW_BUF(ECP_ECDH_SIZE_KEY+1, ECP_MTYPE_KGET_REP, parent)];
-            unsigned char pld_buf[ECP_SIZE_PLD_RAW_BUF(ECP_ECDH_SIZE_KEY+1, ECP_MTYPE_KGET_REP, parent)];
-
-            unsigned char *buf = ecp_pld_get_buf(pld_buf, ECP_MTYPE_KGET_REP);
-            ecp_pld_set_type(pld_buf, ECP_MTYPE_KGET_REP);
-
-            _packet.buffer = pkt_buf;
-            _packet.size = ECP_SIZE_PKT_RAW_BUF(ECP_ECDH_SIZE_KEY+1, ECP_MTYPE_KGET_REP, parent);
-            _payload.buffer = pld_buf;
-            _payload.size = ECP_SIZE_PLD_RAW_BUF(ECP_ECDH_SIZE_KEY+1, ECP_MTYPE_KGET_REP, parent);
-
-            rv = ecp_sock_dhkey_get_curr(sock, buf, buf+1);
-            if (!rv) {
-                ssize_t _rv;
-
-                _rv = ecp_pld_send_raw(sock, parent, addr, &_packet, s_idx, c_idx, &public, &shsec, packet+ECP_SIZE_PKT_HDR, seq_p, &_payload, ECP_SIZE_PLD(ECP_ECDH_SIZE_KEY+1, ECP_MTYPE_KGET_REP), 0);
-                if (_rv < 0) rv = _rv;
-            }
+        ECPPktMeta pkt_meta;
+        unsigned char *msg = payload+ECP_SIZE_PLD_HDR+1;
+        size_t msg_size = dec_size-ECP_SIZE_PLD_HDR-1;
+        ecp_sock_handler_msg_t handler;
+
+        if (key == NULL) return ECP_ERR;
+        if ((mtype & ECP_MTYPE_MASK) >= ECP_MAX_MTYPE_SOCK) return ECP_ERR_MAX_MTYPE;
+        if (mtype & ECP_MTYPE_FLAG_REP) return ECP_ERR;
+
+        memcpy(&pkt_meta.public, &public, sizeof(pkt_meta.public));
+        memcpy(&pkt_meta.shsec, &shsec, sizeof(pkt_meta.shsec));
+        memcpy(pkt_meta.nonce, nonce_next, sizeof(pkt_meta.nonce));
+        pkt_meta.seq = seq_pkt;
+        pkt_meta.s_idx = s_idx;
+        pkt_meta.c_idx = c_idx;
+
+        handler = sock->handler[mtype & ECP_MTYPE_MASK];
+        if (handler) {
+            rv = handler(sock, addr, parent, msg, msg_size, &pkt_meta, bufs, &conn);
             if (rv) return rv;
-        } else {
-            return ECP_ERR_CONN_NOT_FOUND;
         }
     }
 
     if (conn == NULL) return dec_size;
 
+    seq_check = 1;
+    seq_reset = 0;
+
     if (is_open) {
 #ifdef ECP_WITH_RBUF
-        if (conn->rbuf.recv || (payload[ECP_SIZE_PLD_HDR] == ECP_MTYPE_RBACK) || (payload[ECP_SIZE_PLD_HDR] == ECP_MTYPE_RBFLUSH)) seq_check = 0;
+        if (conn->rbuf.recv || (mtype == ECP_MTYPE_RBACK) || (mtype == ECP_MTYPE_RBFLUSH)) {
+            seq_check = 0;
+        }
 #endif
 
         if (seq_check) {
-            if (ECP_SEQ_LTE(seq_p, seq_c)) {
-                ecp_seq_t seq_offset = seq_c - seq_p;
+            if (ECP_SEQ_LTE(seq_pkt, seq_conn)) {
+                ecp_seq_t seq_offset = seq_conn - seq_pkt;
                 if (seq_offset < ECP_SIZE_ACKB) {
                     ecp_ack_t ack_mask = ((ecp_ack_t)1 << seq_offset);
                     if (ack_mask & seq_map) rv = ECP_ERR_SEQ;
-                    if (!rv) seq_n = seq_c;
+                    if (!rv) seq_last = seq_conn;
                 } else {
                     rv = ECP_ERR_SEQ;
                 }
             } else {
-                ecp_seq_t seq_offset = seq_p - seq_c;
+                ecp_seq_t seq_offset = seq_pkt - seq_conn;
                 if (seq_offset < ECP_MAX_SEQ_FWD) {
                     if (seq_offset < ECP_SIZE_ACKB) {
                         seq_map = seq_map << seq_offset;
@@ -1274,13 +1405,13 @@ ssize_t ecp_unpack(ECPSocket *sock, ECPNetAddr *addr, ECPConnection *parent, ECP
                         seq_map = 0;
                     }
                     seq_map |= 1;
-                    seq_n = seq_p;
+                    seq_last = seq_pkt;
                 } else {
                     rv = ECP_ERR_SEQ;
                 }
             }
 
-            if ((rv == ECP_ERR_SEQ) && (payload[ECP_SIZE_PLD_HDR] == ECP_MTYPE_OPEN_REQ) && key) {
+            if ((rv == ECP_ERR_SEQ) && (mtype == ECP_MTYPE_OPEN_REQ) && key) {
                 rv = ECP_OK;
                 seq_reset = 1;
             }
@@ -1289,12 +1420,12 @@ ssize_t ecp_unpack(ECPSocket *sock, ECPNetAddr *addr, ECPConnection *parent, ECP
     }
 
     if (!is_open || seq_reset) {
-        seq_n = seq_p;
+        seq_last = seq_pkt;
         seq_map = 1;
 
 #ifdef ECP_WITH_RBUF
         if (conn->rbuf.recv) {
-            rv = ecp_rbuf_recv_start(conn, seq_p);
+            rv = ecp_rbuf_recv_start(conn, seq_pkt);
             if (rv) goto ecp_unpack_err;
         }
 #endif
@@ -1303,14 +1434,13 @@ ssize_t ecp_unpack(ECPSocket *sock, ECPNetAddr *addr, ECPConnection *parent, ECP
 #ifdef ECP_WITH_PTHREAD
     pthread_mutex_lock(&conn->mutex);
 #endif
-    memcpy(conn->nonce, packet+ECP_SIZE_PKT_HDR, sizeof(conn->nonce));
+    memcpy(conn->nonce, nonce_next, sizeof(conn->nonce));
     if (addr) conn->node.addr = *addr;
     if (seq_check) {
-        conn->seq_in = seq_n;
+        conn->seq_in = seq_last;
         conn->seq_in_map = seq_map;
     }
     if (key) {
-        if (is_new) rv = conn_dhkey_new_pub_remote(conn, c_idx, packet+ECP_SIZE_PROTO+1);
         if (!rv) rv = conn_dhkey_new_pub_local(conn, l_idx);
         if (!rv) rv = conn_shsec_set(conn, s_idx, c_idx, &shsec);
     }
@@ -1321,7 +1451,7 @@ ssize_t ecp_unpack(ECPSocket *sock, ECPNetAddr *addr, ECPConnection *parent, ECP
     if (rv) goto ecp_unpack_err;
 
     *_conn = conn;
-    *_seq = seq_p;
+    *_seq = seq_pkt;
     return dec_size;
 
 ecp_unpack_err:
@@ -1350,9 +1480,11 @@ ssize_t ecp_pkt_handle(ECPSocket *sock, ECPNetAddr *addr, ECPConnection *parent,
 
     if (conn) {
 #ifdef ECP_WITH_RBUF
-        if (conn->rbuf.recv) rv = ecp_rbuf_recv_store(conn, seq, bufs->payload->buffer+ECP_SIZE_PLD_HDR, pld_size-ECP_SIZE_PLD_HDR, bufs);
+        if (conn->rbuf.recv) {
+            rv = ecp_rbuf_recv_store(conn, seq, bufs->payload->buffer+ECP_SIZE_PLD_HDR, pld_size-ECP_SIZE_PLD_HDR, bufs);
+        }
 #endif
-        if (rv == 0) rv = ecp_msg_handle(conn, seq, bufs->payload->buffer+ECP_SIZE_PLD_HDR, pld_size-ECP_SIZE_PLD_HDR, bufs);
+        if (rv == 0) rv = ecp_conn_handle_msg(conn, seq, bufs->payload->buffer+ECP_SIZE_PLD_HDR, pld_size-ECP_SIZE_PLD_HDR, bufs);
 
 #ifdef ECP_WITH_PTHREAD
         pthread_mutex_lock(&conn->mutex);
@@ -1379,46 +1511,56 @@ ssize_t ecp_pkt_send(ECPSocket *sock, ECPNetAddr *addr, ECPBuffer *packet, size_
     return rv;
 }
 
-int ecp_seq_item_init(ECPSeqItem *seq_item) {
-    memset(seq_item, 0, sizeof(ECPSeqItem));
+int ecp_msg_get_type(unsigned char *msg, size_t msg_size, unsigned char *mtype) {
+    if (msg_size == 0) ECP_ERR;
 
+    *mtype = msg[0];
     return ECP_OK;
 }
 
-int ecp_frag_iter_init(ECPFragIter *iter, unsigned char *buffer, size_t buf_size) {
-    memset(iter, 0, sizeof(ECPFragIter));
-    iter->buffer = buffer;
-    iter->buf_size = buf_size;
+int ecp_msg_set_type(unsigned char *msg, size_t msg_size, unsigned char type) {
+    if (msg_size == 0) ECP_ERR;
 
+    msg[0] = type;
     return ECP_OK;
 }
 
-unsigned char ecp_msg_get_type(unsigned char *msg) {
-    return msg[0];
-}
+int ecp_msg_get_frag(unsigned char *msg, size_t msg_size, unsigned char *frag_cnt, unsigned char *frag_tot, uint16_t *frag_size) {
+    if (msg_size < 3) return ECP_ERR;
+    if (!(msg[0] & ECP_MTYPE_FLAG_FRAG)) return ECP_ERR;
+    if (msg[2] == 0) return ECP_ERR;
 
-unsigned char *ecp_msg_get_content(unsigned char *msg, size_t msg_size) {
-    size_t offset = 1 + ECP_SIZE_MT_FLAG(msg[0]);
+    *frag_cnt = msg[1];
+    *frag_tot = msg[2];
+    *frag_size = \
+        (msg[3] << 8) | \
+        (msg[4]);
 
-    if (msg_size < offset) return NULL;
-    return msg + offset;
+    return ECP_OK;
 }
 
-int ecp_msg_get_frag(unsigned char *msg, size_t msg_size, unsigned char *frag_cnt, unsigned char *frag_tot) {
-    if (!(msg[0] & ECP_MTYPE_FLAG_FRAG)) return ECP_ERR;
+int ecp_msg_set_frag(unsigned char *msg, size_t msg_size, unsigned char frag_cnt, unsigned char frag_tot, uint16_t frag_size) {
     if (msg_size < 3) return ECP_ERR;
+    if (!(msg[0] & ECP_MTYPE_FLAG_FRAG)) return ECP_ERR;
 
-    *frag_cnt = msg[1];
-    *frag_tot = msg[2];
+    msg[1] = frag_cnt;
+    msg[2] = frag_tot;
+    msg[3] = (frag_size & 0xFF00) >> 8;
+    msg[4] = (frag_size & 0x00FF);
 
     return ECP_OK;
 }
 
 int ecp_msg_get_pts(unsigned char *msg, size_t msg_size, ecp_pts_t *pts) {
-    unsigned char mtype = msg[0];
-    size_t offset = 1 + ECP_SIZE_MT_FRAG(mtype);
+    unsigned char mtype;
+    size_t offset;
+
+    if (msg_size == 0) ECP_ERR;
 
+    mtype = msg[0];
     if (!(mtype & ECP_MTYPE_FLAG_PTS)) return ECP_ERR;
+
+    offset = 1 + ECP_SIZE_MT_FRAG(mtype);
     if (msg_size < offset + sizeof(ecp_pts_t)) return ECP_ERR;
 
     *pts = \
@@ -1430,145 +1572,148 @@ int ecp_msg_get_pts(unsigned char *msg, size_t msg_size, ecp_pts_t *pts) {
     return ECP_OK;
 }
 
-int ecp_msg_defrag(ECPFragIter *iter, ecp_seq_t seq, unsigned char *msg_in, size_t msg_in_size, unsigned char **msg_out, size_t *msg_out_size) {
-    unsigned char frag_cnt, frag_tot;
-    int rv;
+int ecp_msg_set_pts(unsigned char *msg, size_t msg_size, ecp_pts_t pts) {
+    unsigned char mtype;
+    size_t offset;
 
-    rv = ecp_msg_get_frag(msg_in, msg_in_size, &frag_cnt, &frag_tot);
-    if (rv == ECP_OK) {
-        unsigned char mtype = ecp_msg_get_type(msg_in) & (~ECP_MTYPE_FLAG_FRAG);
-        unsigned char *content = NULL;
-        size_t content_size = 0;
-        size_t buf_offset = 0;
+    if (msg_size == 0) ECP_ERR;
 
-        content = ecp_msg_get_content(msg_in, msg_in_size);
-        if (content == NULL) return ECP_ERR_MIN_MSG;
+    mtype = msg[0];
+    if (!(mtype & ECP_MTYPE_FLAG_PTS)) return ECP_ERR;
 
-        content_size = msg_in_size - (content - msg_in);
-        if (frag_cnt == 0) {
-            iter->seq = seq;
-            iter->frag_cnt = 0;
-            iter->frag_size = content_size;
-            iter->buffer[0] = mtype;
-            if (ECP_SIZE_MT_FLAG(mtype)) {
-                memcpy(iter->buffer + 1, msg_in, ECP_SIZE_MT_FLAG(mtype));
-            }
-        } else {
-            if (iter->seq + frag_cnt != seq) {
-                iter->seq = seq - frag_cnt;
-                iter->frag_cnt = 0;
-                return ECP_ERR_ITER;
-            }
-            if (iter->frag_cnt != frag_cnt) return ECP_ERR_ITER;
-        }
-        if ((1 + ECP_SIZE_MT_FLAG(mtype) + iter->frag_size * frag_tot) > iter->buf_size) return ECP_ERR_SIZE;
+    offset = 1 + ECP_SIZE_MT_FRAG(mtype);
+    if (msg_size < offset + sizeof(ecp_pts_t)) return ECP_ERR;
 
-        buf_offset = 1 + ECP_SIZE_MT_FLAG(mtype) + iter->frag_size * frag_cnt;
-        memcpy(iter->buffer + buf_offset, content, content_size);
-        iter->frag_cnt++;
+    msg[offset]     = (pts & 0xFF000000) >> 24;
+    msg[offset + 1] = (pts & 0x00FF0000) >> 16;
+    msg[offset + 2] = (pts & 0x0000FF00) >> 8;
+    msg[offset + 3] = (pts & 0x000000FF);
 
-        if (iter->frag_cnt == frag_tot) {
-            *msg_out = iter->buffer;
-            *msg_out_size = buf_offset + content_size;
-            return ECP_OK;
-        } else {
-            return ECP_ITER_NEXT;
-        }
-    } else {
-        iter->seq = seq;
-        *msg_out = msg_in;
-        *msg_out_size = msg_in_size;
-        return ECP_OK;
-    }
+    return ECP_OK;
 }
 
-ssize_t ecp_msg_handle(ECPConnection *conn, ecp_seq_t seq, unsigned char *msg, size_t msg_size, ECP2Buffer *bufs) {
-    ecp_conn_handler_msg_t handler = NULL;
-    unsigned char mtype = 0;
-    unsigned char *content = NULL;
-    size_t rem_size = msg_size;
-    ssize_t rv;
-    int _rv;
+unsigned char *ecp_msg_get_content(unsigned char *msg, size_t msg_size) {
+    unsigned char mtype;
+    size_t offset;
 
-    while (rem_size) {
-        mtype = ecp_msg_get_type(msg);
-        if ((mtype & ECP_MTYPE_MASK) >= ECP_MAX_MTYPE) return ECP_ERR_MAX_MTYPE;
+    if (msg_size == 0) ECP_ERR;
 
-        ecp_timer_pop(conn, mtype);
+    mtype = msg[0];
+    offset = 1 + ECP_SIZE_MT_FLAG(mtype);
+    if (msg_size < offset) return NULL;
 
-#ifdef ECP_WITH_RBUF
-        if (conn->rbuf.recv && conn->rbuf.recv->frag_iter) {
+    return msg + offset;
+}
 
-            _rv = ecp_msg_defrag(conn->rbuf.recv->frag_iter, seq, msg, msg_size, &msg, &rem_size);
-            if (_rv < 0) return _rv;
-            if (_rv == ECP_ITER_NEXT) return msg_size;
-        }
-#endif
+int ecp_msg_defrag(ECPFragIter *iter, ecp_seq_t seq, unsigned char mtype, unsigned char *msg_in, size_t msg_in_size, unsigned char **msg_out, size_t *msg_out_size) {
+    unsigned char *content;
+    unsigned char frag_cnt, frag_tot;
+    uint16_t frag_size;
+    size_t content_size;
+    size_t buf_offset;
+    int rv;
 
-        content = ecp_msg_get_content(msg, rem_size);
-        if (content == NULL) return ECP_ERR_MIN_MSG;
-        rem_size -= content - msg;
+    rv = ecp_msg_get_frag(msg_in, msg_in_size, &frag_cnt, &frag_tot, &frag_size);
+    if (rv) return ECP_ERR_MIN_MSG;
 
-        handler = conn->sock->ctx->handler[conn->type] ? conn->sock->ctx->handler[conn->type]->msg[mtype & ECP_MTYPE_MASK] : NULL;
-        if (handler) {
-            rv = handler(conn, seq, mtype, content, rem_size, bufs);
-            if (rv < 0) return rv;
-            if (rv > rem_size) return ECP_ERR;
+    content = ecp_msg_get_content(msg_in, msg_in_size);
+    if (content == NULL) return ECP_ERR_MIN_MSG;
 
-            rem_size -= rv;
-            msg = content + rv;
-        } else {
-            return msg_size - rem_size - 1;
+    content_size = msg_in_size - (content - msg_in);
+    if (content_size == 0) return ECP_ERR_MIN_MSG;
+
+    if (iter->content_size && (iter->seq + frag_cnt != seq)) ecp_frag_iter_reset(iter);
+
+    if (iter->content_size == 0) {
+        iter->seq = seq - frag_cnt;
+        iter->frag_cnt = 0;
+    }
+
+    mtype &= (~ECP_MTYPE_FLAG_FRAG);
+    if (frag_cnt == 0) {
+        if (1 + ECP_SIZE_MT_FLAG(mtype) > iter->buf_size) return ECP_ERR_SIZE;
+        iter->buffer[0] = mtype;
+        if (ECP_SIZE_MT_FLAG(mtype)) {
+            memcpy(iter->buffer + 1, msg_in, ECP_SIZE_MT_FLAG(mtype));
         }
     }
 
-    return msg_size;
+    buf_offset = 1 + ECP_SIZE_MT_FLAG(mtype) + frag_size * frag_cnt;
+    if (buf_offset + content_size > iter->buf_size) return ECP_ERR_SIZE;
+
+    memcpy(iter->buffer + buf_offset, content, content_size);
+    iter->frag_cnt++;
+    iter->content_size += content_size;
+    if (iter->frag_cnt == frag_tot) {
+        *msg_out = iter->buffer;
+        *msg_out_size = iter->content_size;
+        return ECP_OK;
+    } else {
+        return ECP_ITER_NEXT;
+    }
 }
 
-void ecp_pld_set_type(unsigned char *payload, unsigned char mtype) {
-    payload[ECP_SIZE_PLD_HDR] = mtype;
+int ecp_pld_get_type(unsigned char *payload, size_t pld_size, unsigned char *mtype) {
+    payload += ECP_SIZE_PLD_HDR;
+    pld_size -= ECP_SIZE_PLD_HDR;
+
+    return ecp_msg_get_type(payload, pld_size, mtype);
 }
 
-int ecp_pld_set_frag(unsigned char *payload, unsigned char mtype, unsigned char frag_cnt, unsigned char frag_tot) {
-    size_t offset = ECP_SIZE_PLD_HDR + 1;
+int ecp_pld_set_type(unsigned char *payload, size_t pld_size, unsigned char mtype) {
+    payload += ECP_SIZE_PLD_HDR;
+    pld_size -= ECP_SIZE_PLD_HDR;
 
-    if (!(mtype & ECP_MTYPE_FLAG_FRAG)) return ECP_ERR;
-    payload[offset] = frag_cnt;
-    payload[offset + 1] = frag_tot;
-    return ECP_OK;
+    return ecp_msg_set_type(payload, pld_size, mtype);
 }
 
-int ecp_pld_set_pts(unsigned char *payload, unsigned char mtype, ecp_pts_t pts) {
-    size_t offset = ECP_SIZE_PLD_HDR + 1 + ECP_SIZE_MT_FRAG(mtype);
+int ecp_pld_get_frag(unsigned char *payload, size_t pld_size, unsigned char *frag_cnt, unsigned char *frag_tot, uint16_t *frag_size) {
+    payload += ECP_SIZE_PLD_HDR;
+    pld_size -= ECP_SIZE_PLD_HDR;
 
-    if (!(mtype & ECP_MTYPE_FLAG_PTS)) return ECP_ERR;
+    return ecp_msg_get_frag(payload, pld_size, frag_cnt, frag_tot, frag_size);
+}
 
-    payload[offset] = (pts & 0xFF000000) >> 24;
-    payload[offset + 1] = (pts & 0x00FF0000) >> 16;
-    payload[offset + 2] = (pts & 0x0000FF00) >> 8;
-    payload[offset + 3] = (pts & 0x000000FF);
+int ecp_pld_set_frag(unsigned char *payload, size_t pld_size, unsigned char frag_cnt, unsigned char frag_tot, uint16_t frag_size) {
+    payload += ECP_SIZE_PLD_HDR;
+    pld_size -= ECP_SIZE_PLD_HDR;
 
-    return ECP_OK;
+    return ecp_msg_set_frag(payload, pld_size, frag_cnt, frag_tot, frag_size);
 }
 
-unsigned char ecp_pld_get_type(unsigned char *payload) {
-    return payload[ECP_SIZE_PLD_HDR];
+int ecp_pld_get_pts(unsigned char *payload, size_t pld_size, ecp_pts_t *pts) {
+    payload += ECP_SIZE_PLD_HDR;
+    pld_size -= ECP_SIZE_PLD_HDR;
+
+    return ecp_msg_get_pts(payload, pld_size, pts);
 }
 
-unsigned char *ecp_pld_get_buf(unsigned char *payload, unsigned char mtype) {
-    return payload + ECP_SIZE_PLD_HDR + 1 + ECP_SIZE_MT_FLAG(mtype);
+int ecp_pld_set_pts(unsigned char *payload, size_t pld_size, ecp_pts_t pts) {
+    payload += ECP_SIZE_PLD_HDR;
+    pld_size -= ECP_SIZE_PLD_HDR;
+
+    return ecp_msg_set_pts(payload, pld_size, pts);
+}
+
+unsigned char *ecp_pld_get_buf(unsigned char *payload, size_t pld_size) {
+    payload += ECP_SIZE_PLD_HDR;
+    pld_size -= ECP_SIZE_PLD_HDR;
+
+    return ecp_msg_get_content(payload, pld_size);
 }
 
-static ssize_t pld_send(ECPConnection *conn, ECPBuffer *packet, unsigned char s_idx, unsigned char c_idx, ECPBuffer *payload, size_t pld_size, unsigned char flags, ECPTimerItem *ti, ECPSeqItem *si) {
+static ssize_t pld_send(ECPConnection *conn, ECPBuffer *packet, unsigned char s_idx, unsigned char c_idx, ECPSeqItem *si, ECPBuffer *payload, size_t pld_size, unsigned char flags, ECPTimerItem *ti) {
     ECPSocket *sock = conn->sock;
     ECPNetAddr addr;
     ssize_t rv;
 
-    rv = ecp_pack(conn, packet, s_idx, c_idx, payload, pld_size, si, &addr);
+    rv = ecp_pack_conn(conn, packet, s_idx, c_idx, si, payload, pld_size, &addr);
     if (rv < 0) return rv;
 
 #ifdef ECP_WITH_RBUF
-    if (conn->rbuf.send) return ecp_rbuf_pkt_send(conn->rbuf.send, conn->sock, &addr, packet, rv, flags, ti, si);
+    if (conn->rbuf.send) {
+        return ecp_rbuf_pkt_send(conn->rbuf.send, conn->sock, &addr, packet, rv, flags, ti, si);
+    }
 #endif
 
     if (ti) {
@@ -1577,42 +1722,42 @@ static ssize_t pld_send(ECPConnection *conn, ECPBuffer *packet, unsigned char s_
         _rv = ecp_timer_push(ti);
         if (_rv) return _rv;
     }
-    return ecp_pkt_send(sock, &addr, packet, rv, flags);
-}
 
-ssize_t ecp_pld_send(ECPConnection *conn, ECPBuffer *packet, ECPBuffer *payload, size_t pld_size, unsigned char flags) {
-    return ecp_pld_send_ll(conn, packet, ECP_ECDH_IDX_INV, ECP_ECDH_IDX_INV, payload, pld_size, flags, NULL);
-}
-
-ssize_t ecp_pld_send_wtimer(ECPConnection *conn, ECPBuffer *packet, ECPBuffer *payload, size_t pld_size, unsigned char flags, ECPTimerItem *ti) {
-    return ecp_pld_send_ll(conn, packet, ECP_ECDH_IDX_INV, ECP_ECDH_IDX_INV, payload, pld_size, flags, ti);
+    return ecp_pkt_send(sock, &addr, packet, rv, flags);
 }
 
-ssize_t ecp_pld_send_ll(ECPConnection *conn, ECPBuffer *packet, unsigned char s_idx, unsigned char c_idx, ECPBuffer *payload, size_t pld_size, unsigned char flags, ECPTimerItem *ti) {
-    ECPSeqItem *_seq_item = NULL;
-
+ssize_t _ecp_pld_send(ECPConnection *conn, ECPBuffer *packet, unsigned char s_idx, unsigned char c_idx, ECPSeqItem *si, ECPBuffer *payload, size_t pld_size, unsigned char flags, ECPTimerItem *ti) {
 #ifdef ECP_WITH_RBUF
-    ECPSeqItem seq_item;
-    int rv;
+    if ((si == NULL) && conn->rbuf.send) {
+        ECPSeqItem seq_item;
+        int rv;
 
-    if (conn->rbuf.send) {
         rv = ecp_seq_item_init(&seq_item);
         if (rv) return rv;
-        _seq_item = &seq_item;
+
+        return pld_send(conn, packet, s_idx, c_idx, &seq_item, payload, pld_size, flags, ti);
     }
 #endif
 
-    return pld_send(conn, packet, s_idx, c_idx, payload, pld_size, flags, ti, _seq_item);
+    return pld_send(conn, packet, s_idx, c_idx, NULL, payload, pld_size, flags, ti);
+}
+
+ssize_t ecp_pld_send(ECPConnection *conn, ECPBuffer *packet, ECPBuffer *payload, size_t pld_size, unsigned char flags) {
+    return _ecp_pld_send(conn, packet, ECP_ECDH_IDX_INV, ECP_ECDH_IDX_INV, NULL, payload, pld_size, flags, NULL);
+}
+
+ssize_t ecp_pld_send_wtimer(ECPConnection *conn, ECPBuffer *packet, ECPBuffer *payload, size_t pld_size, unsigned char flags, ECPTimerItem *ti) {
+    return _ecp_pld_send(conn, packet, ECP_ECDH_IDX_INV, ECP_ECDH_IDX_INV, NULL, payload, pld_size, flags, ti);
 }
 
-ssize_t ecp_pld_send_raw(ECPSocket *sock, ECPConnection *parent, ECPNetAddr *addr, ECPBuffer *packet, unsigned char s_idx, unsigned char c_idx, ecp_dh_public_t *public, ecp_aead_key_t *shsec, unsigned char *nonce, ecp_seq_t seq, ECPBuffer *payload, size_t pld_size, unsigned char flags) {
+ssize_t ecp_pld_send_tr(ECPSocket *sock, ECPNetAddr *addr, ECPConnection *parent, ECPBuffer *packet, ECPPktMeta *pkt_meta, ECPBuffer *payload, size_t pld_size, unsigned char flags) {
     ECPNetAddr _addr;
     ssize_t rv;
 
-    rv = ecp_pack_raw(sock, parent, packet, s_idx, c_idx, public, shsec, nonce, seq, payload, pld_size, &_addr);
+    rv = ecp_pack(sock->ctx, parent, packet, pkt_meta, payload, pld_size, &_addr);
     if (rv < 0) return rv;
 
-    return ecp_pkt_send(sock, parent ? &_addr : addr, packet, rv, flags);
+    return ecp_pkt_send(sock, addr ? addr : &_addr, packet, rv, flags);
 }
 
 ssize_t ecp_send(ECPConnection *conn, unsigned char mtype, unsigned char *content, size_t content_size) {
@@ -1620,28 +1765,29 @@ ssize_t ecp_send(ECPConnection *conn, unsigned char mtype, unsigned char *conten
     ECPBuffer payload;
     unsigned char pkt_buf[ECP_MAX_PKT];
     unsigned char pld_buf[ECP_MAX_PLD];
+    unsigned char *content_buf;
     ssize_t rv = 0;
     int pkt_cnt = 0;
     int vc_cnt = conn->pcount + 1;
-    size_t size_max = ECP_MAX_PKT - (ECP_SIZE_PKT_HDR + ECP_AEAD_SIZE_TAG + ECP_SIZE_SEQ + 1) * vc_cnt;
+    size_t pld_max = ECP_MAX_PKT - (ECP_SIZE_PKT_HDR + ECP_AEAD_SIZE_TAG + ECP_SIZE_PLD_HDR + 1) * vc_cnt;
 
     packet.buffer = pkt_buf;
     packet.size = ECP_MAX_PKT;
     payload.buffer = pld_buf;
     payload.size = ECP_MAX_PLD;
 
-    if (content_size + ECP_SIZE_MT_FLAG(mtype) > size_max) {
-        int i;
-        int _rv = ECP_OK;
+    if (ECP_SIZE_PLD(content_size, mtype) > pld_max) {
         size_t frag_size, frag_size_final;
-        ecp_seq_t seq_start = 0;
+        ecp_seq_t seq_start;
         ECPSeqItem seq_item;
+        int i;
+        int _rv;
 
         _rv = ecp_seq_item_init(&seq_item);
         if (_rv) return _rv;
 
         mtype |= ECP_MTYPE_FLAG_FRAG;
-        frag_size = size_max - ECP_SIZE_MT_FLAG(mtype);
+        frag_size = pld_max - (ECP_SIZE_PLD_HDR +1 +ECP_SIZE_MT_FLAG(mtype));
         pkt_cnt = content_size / frag_size;
         frag_size_final = content_size - frag_size * pkt_cnt;
         if (frag_size_final) pkt_cnt++;
@@ -1661,21 +1807,25 @@ ssize_t ecp_send(ECPConnection *conn, unsigned char mtype, unsigned char *conten
         for (i=0; i<pkt_cnt; i++) {
             ssize_t _rv;
 
+            ecp_pld_set_type(pld_buf, ECP_MAX_PLD, mtype);
+            ecp_pld_set_frag(pld_buf, ECP_MAX_PLD, i, pkt_cnt, frag_size);
+            content_buf = ecp_pld_get_buf(pld_buf, ECP_MAX_PLD);
+
             if ((i == pkt_cnt - 1) && frag_size_final) frag_size = frag_size_final;
-            ecp_pld_set_type(pld_buf, mtype);
-            ecp_pld_set_frag(pld_buf, mtype, i, pkt_cnt);
-            memcpy(ecp_pld_get_buf(pld_buf, mtype), content, frag_size);
+            memcpy(content_buf, content, frag_size);
             content += frag_size;
-
             seq_item.seq = seq_start + i;
-            _rv = pld_send(conn, &packet, ECP_ECDH_IDX_INV, ECP_ECDH_IDX_INV, &payload, ECP_SIZE_PLD(frag_size, mtype), 0, NULL, &seq_item);
+
+            _rv = _ecp_pld_send(conn, &packet, ECP_ECDH_IDX_INV, ECP_ECDH_IDX_INV, &seq_item, &payload, ECP_SIZE_PLD(frag_size, mtype), 0, NULL);
             if (_rv < 0) return _rv;
 
             rv += _rv;
         }
     } else {
-        ecp_pld_set_type(pld_buf, mtype);
-        memcpy(ecp_pld_get_buf(pld_buf, mtype), content, content_size);
+        ecp_pld_set_type(pld_buf, ECP_MAX_PLD, mtype);
+        content_buf = ecp_pld_get_buf(pld_buf, ECP_MAX_PLD);
+
+        memcpy(content_buf, content, content_size);
         rv = ecp_pld_send(conn, &packet, &payload, ECP_SIZE_PLD(content_size, mtype), 0);
     }
     return rv;
diff --git a/ecp/src/core.h b/ecp/src/core.h
index 3c62450..bb96f26 100644
--- a/ecp/src/core.h
+++ b/ecp/src/core.h
@@ -7,6 +7,8 @@
 #include <pthread.h>
 #endif
 
+#define ECP_MEM_TINY                1
+
 #define ECP_OK                      0
 #define ECP_ITER_NEXT               1
 
@@ -52,6 +54,7 @@
 #define ECP_MAX_CTYPE               8
 #define ECP_MAX_MTYPE               16
 #define ECP_MAX_MTYPE_SYS           4
+#define ECP_MAX_MTYPE_SOCK          ECP_MAX_MTYPE_SYS
 #define ECP_MAX_SEQ_FWD             1024
 
 #define ECP_SIZE_PKT_HDR            (ECP_SIZE_PROTO+1+ECP_ECDH_SIZE_KEY+ECP_AEAD_SIZE_NONCE)
@@ -75,7 +78,7 @@
 #define ECP_MTYPE_OPEN              0x00
 #define ECP_MTYPE_KGET              0x01
 #define ECP_MTYPE_KPUT              0x02
-#define ECP_MTYPE_NOP               0x03
+#define ECP_MTYPE_DIR               0x03
 
 #define ECP_MTYPE_OPEN_REQ          (ECP_MTYPE_OPEN)
 #define ECP_MTYPE_OPEN_REP          (ECP_MTYPE_OPEN | ECP_MTYPE_FLAG_REP)
@@ -115,7 +118,7 @@ typedef uint32_t ecp_seq_t;
 #define ECP_SEQ_LTE(a,b)            ((ecp_seq_t)((ecp_seq_t)(b) - (ecp_seq_t)(a)) < ECP_SEQ_HALF)
 
 
-#define ECP_SIZE_MT_FRAG(F)         ((F) & ECP_MTYPE_FLAG_FRAG ? 2 : 0)
+#define ECP_SIZE_MT_FRAG(F)         ((F) & ECP_MTYPE_FLAG_FRAG ? 2 + sizeof(uint16_t) : 0)
 #define ECP_SIZE_MT_PTS(F)          ((F) & ECP_MTYPE_FLAG_PTS ? sizeof(ecp_pts_t) : 0)
 #define ECP_SIZE_MT_FLAG(F)         (ECP_SIZE_MT_FRAG(F)+ECP_SIZE_MT_PTS(F))
 #define ECP_SIZE_PLD(X,F)           ((X) + ECP_SIZE_PLD_HDR+1+ECP_SIZE_MT_FLAG(F))
@@ -126,8 +129,8 @@ typedef uint32_t ecp_seq_t;
 #define ECP_SIZE_PLD_BUF(X,T,C)     (ECP_SIZE_PLD(X,T)+(C)->pcount*(ECP_SIZE_PKT_HDR+ECP_SIZE_MSG_BUF(T,(C)->parent)+ECP_AEAD_SIZE_TAG))
 #define ECP_SIZE_PKT_BUF(X,T,C)     (ECP_SIZE_PLD_BUF(X,T,C)+ECP_SIZE_PKT_HDR+ECP_AEAD_SIZE_TAG)
 
-#define ECP_SIZE_PLD_RAW_BUF(X,T,P) (ECP_SIZE_PLD(X,T)+((P) ? ((P)->pcount+1)*(ECP_SIZE_PKT_HDR+ECP_SIZE_MSG_BUF(T,P)+ECP_AEAD_SIZE_TAG) : 0))
-#define ECP_SIZE_PKT_RAW_BUF(X,T,P) (ECP_SIZE_PLD_RAW_BUF(X,T,P)+ECP_SIZE_PKT_HDR+ECP_AEAD_SIZE_TAG)
+#define ECP_SIZE_PLD_BUF_TR(X,T,P)  (ECP_SIZE_PLD(X,T)+((P) ? ((P)->pcount+1)*(ECP_SIZE_PKT_HDR+ECP_SIZE_MSG_BUF(T,P)+ECP_AEAD_SIZE_TAG) : 0))
+#define ECP_SIZE_PKT_BUF_TR(X,T,P)  (ECP_SIZE_PLD_BUF_TR(X,T,P)+ECP_SIZE_PKT_HDR+ECP_AEAD_SIZE_TAG)
 
 #ifdef ECP_DEBUG
 #include <stdio.h>
@@ -139,7 +142,7 @@ struct ECPContext;
 struct ECPSocket;
 struct ECPConnection;
 struct ECPSeqItem;
-struct ECPFragIter;
+struct ECPPktMeta;
 
 #include "platform/transport.h"
 #include "crypto/crypto.h"
@@ -151,7 +154,7 @@ struct ECPFragIter;
 
 typedef int (*ecp_rng_t) (void *, size_t);
 
-typedef int (*ecp_conn_handler_new_t) (struct ECPSocket *s, struct ECPConnection *p, unsigned char *msg, size_t sz, struct ECPConnection **c);
+typedef int (*ecp_sock_handler_msg_t) (struct ECPSocket *s, ECPNetAddr *a, struct ECPConnection *p, unsigned char *msg, size_t sz, struct ECPPktMeta *m, struct ECP2Buffer *b, struct ECPConnection **c);
 typedef ssize_t (*ecp_conn_handler_msg_t) (struct ECPConnection *c, ecp_seq_t s, unsigned char t, unsigned char *msg, ssize_t sz, struct ECP2Buffer *b);
 
 typedef struct ECPConnection * (*ecp_conn_alloc_t) (unsigned char t);
@@ -210,12 +213,21 @@ typedef struct ECPSeqItem {
 
 typedef struct ECPFragIter {
     ecp_seq_t seq;
-    size_t frag_size;
     unsigned char frag_cnt;
     unsigned char *buffer;
     size_t buf_size;
+    size_t content_size;
 } ECPFragIter;
 
+typedef struct ECPPktMeta {
+    ecp_aead_key_t shsec;
+    ecp_dh_public_t public;
+    ecp_seq_t seq;
+    unsigned char nonce[ECP_AEAD_SIZE_NONCE];
+    unsigned char s_idx;
+    unsigned char c_idx;
+} ECPPktMeta;
+
 typedef struct ECPConnHandler {
     ecp_conn_handler_msg_t msg[ECP_MAX_MTYPE];
     ecp_conn_create_t conn_create;
@@ -253,7 +265,7 @@ typedef struct ECPSocket {
     unsigned char key_curr;
     ECPSockCTable conn;
     ECPTimer timer;
-    ecp_conn_handler_new_t conn_new;
+    ecp_sock_handler_msg_t handler[ECP_MAX_MTYPE_SOCK];
 #ifdef ECP_WITH_PTHREAD
     pthread_t rcvr_thd;
     pthread_mutex_t mutex;
@@ -290,11 +302,12 @@ typedef struct ECPConnection {
 } ECPConnection;
 
 int ecp_init(ECPContext *ctx);
-
-int ecp_dhkey_generate(ECPContext *ctx, ECPDHKey *key);
-int ecp_node_init(ECPNode *node, ecp_dh_public_t *public, void *addr);
-
 int ecp_ctx_init(ECPContext *ctx);
+int ecp_node_init(ECPNode *node, ecp_dh_public_t *public, void *addr);
+int ecp_seq_item_init(ECPSeqItem *seq_item);
+int ecp_frag_iter_init(ECPFragIter *iter, unsigned char *buffer, size_t buf_size);
+void ecp_frag_iter_reset(ECPFragIter *iter);
+int ecp_dhkey_gen(ECPContext *ctx, ECPDHKey *key);
 
 int ecp_sock_create(ECPSocket *sock, ECPContext *ctx, ECPDHKey *key);
 void ecp_sock_destroy(ECPSocket *sock);
@@ -303,59 +316,64 @@ void ecp_sock_close(ECPSocket *sock);
 int ecp_sock_dhkey_get_curr(ECPSocket *sock, unsigned char *idx, unsigned char *public);
 int ecp_sock_dhkey_new(ECPSocket *sock);
 
+int ecp_conn_init(ECPConnection *conn, ECPNode *node);
 int ecp_conn_create(ECPConnection *conn, ECPSocket *sock, unsigned char ctype);
 void ecp_conn_destroy(ECPConnection *conn);
 int ecp_conn_register(ECPConnection *conn);
 void ecp_conn_unregister(ECPConnection *conn);
 
-int ecp_conn_init(ECPConnection *conn, ECPNode *node);
 int ecp_conn_open(ECPConnection *conn, ECPNode *node);
 int ecp_conn_close(ECPConnection *conn, ecp_cts_t timeout);
-
+int ecp_conn_reset(ECPConnection *conn);
 int ecp_conn_handler_init(ECPConnHandler *handler);
+
+int ecp_conn_dhkey_new(ECPConnection *conn);
+int ecp_conn_dhkey_new_pub(ECPConnection *conn, unsigned char idx, unsigned char *public);
+int ecp_conn_dhkey_get_curr(ECPConnection *conn, unsigned char *idx, unsigned char *public);
+
 ssize_t ecp_conn_send_open(ECPConnection *conn);
-int ecp_conn_handle_new(ECPSocket *sock, ECPConnection *parent, unsigned char *payload, size_t payload_size, ECPConnection **_conn);
+ssize_t ecp_conn_send_kget(ECPConnection *conn);
+ssize_t ecp_conn_send_kput(ECPConnection *conn);
+
 ssize_t ecp_conn_handle_open(ECPConnection *conn, ecp_seq_t seq, unsigned char mtype, unsigned char *msg, ssize_t size, ECP2Buffer *b);
 ssize_t ecp_conn_handle_kget(ECPConnection *conn, ecp_seq_t seq, unsigned char mtype, unsigned char *msg, ssize_t size, ECP2Buffer *b);
 ssize_t ecp_conn_handle_kput(ECPConnection *conn, ecp_seq_t seq, unsigned char mtype, unsigned char *msg, ssize_t size, ECP2Buffer *b);
 ssize_t ecp_conn_handle_exec(ECPConnection *conn, ecp_seq_t seq, unsigned char mtype, unsigned char *msg, ssize_t size, ECP2Buffer *b);
+ssize_t ecp_conn_handle_msg(ECPConnection *conn, ecp_seq_t seq, unsigned char *msg, size_t msg_size, ECP2Buffer *bufs);
+int ecp_sock_handle_open(ECPSocket *sock, ECPNetAddr *addr, ECPConnection *parent, unsigned char *msg, size_t msg_size, ECPPktMeta *pkt_meta, ECP2Buffer *bufs, ECPConnection **_conn);
+int ecp_sock_handle_kget(ECPSocket *sock, ECPNetAddr *addr, ECPConnection *parent, unsigned char *msg, size_t msg_size, ECPPktMeta *pkt_meta, ECP2Buffer *bufs, ECPConnection **_conn);
 
-int ecp_conn_dhkey_new(ECPConnection *conn);
-int ecp_conn_dhkey_new_pub(ECPConnection *conn, unsigned char idx, unsigned char *public);
-int ecp_conn_dhkey_get_curr(ECPConnection *conn, unsigned char *idx, unsigned char *public);
+ssize_t _ecp_pack(ECPContext *ctx, unsigned char *packet, size_t pkt_size, ECPPktMeta *pkt_meta, unsigned char *payload, size_t pld_size);
+ssize_t ecp_pack(ECPContext *ctx, ECPConnection *parent, ECPBuffer *packet, ECPPktMeta *pkt_meta, ECPBuffer *payload, size_t pld_size, ECPNetAddr *addr) ;
 
-ssize_t ecp_pkt_pack(ECPContext *ctx, unsigned char *packet, size_t pkt_size, unsigned char s_idx, unsigned char c_idx, ecp_dh_public_t *public, ecp_aead_key_t *shsec, unsigned char *nonce, ecp_seq_t seq, unsigned char *payload, size_t pld_size);
-ssize_t ecp_pkt_pack_raw(ECPSocket *sock, ECPConnection *parent, unsigned char *packet, size_t pkt_size, unsigned char s_idx, unsigned char c_idx, ecp_dh_public_t *public, ecp_aead_key_t *shsec, unsigned char *nonce, ecp_seq_t seq, unsigned char *payload, size_t pld_size, ECPNetAddr *addr);
-ssize_t ecp_conn_pack(ECPConnection *conn, unsigned char *packet, size_t pkt_size, unsigned char s_idx, unsigned char c_idx, unsigned char *payload, size_t pld_size, ECPSeqItem *si, ECPNetAddr *addr);
-
-ssize_t ecp_pack(ECPConnection *conn, ECPBuffer *packet, unsigned char s_idx, unsigned char c_idx, ECPBuffer *payload, size_t pld_size, ECPSeqItem *si, ECPNetAddr *addr);
-ssize_t ecp_pack_raw(ECPSocket *sock, ECPConnection *parent, ECPBuffer *packet, unsigned char s_idx, unsigned char c_idx, ecp_dh_public_t *public, ecp_aead_key_t *shsec, unsigned char *nonce, ecp_seq_t seq, ECPBuffer *payload, size_t pld_size, ECPNetAddr *addr);
+ssize_t _ecp_pack_conn(ECPConnection *conn, unsigned char *packet, size_t pkt_size, unsigned char s_idx, unsigned char c_idx, ECPSeqItem *si, unsigned char *payload, size_t pld_size, ECPNetAddr *addr);
+ssize_t ecp_pack_conn(ECPConnection *conn, ECPBuffer *packet, unsigned char s_idx, unsigned char c_idx, ECPSeqItem *si, ECPBuffer *payload, size_t pld_size, ECPNetAddr *addr);
 
 ssize_t ecp_unpack(ECPSocket *sock, ECPNetAddr *addr, ECPConnection *parent, ECP2Buffer *bufs, size_t pkt_size, ECPConnection **_conn, ecp_seq_t *_seq);
 ssize_t ecp_pkt_handle(ECPSocket *sock, ECPNetAddr *addr, ECPConnection *parent, ECP2Buffer *bufs, size_t pkt_size);
-
 ssize_t ecp_pkt_send(ECPSocket *sock, ECPNetAddr *addr, ECPBuffer *packet, size_t pkt_size, unsigned char flags);
 
-int ecp_seq_item_init(ECPSeqItem *seq_item);
-int ecp_frag_iter_init(ECPFragIter *iter, unsigned char *buffer, size_t buf_size);
-
-unsigned char ecp_msg_get_type(unsigned char *msg);
-unsigned char *ecp_msg_get_content(unsigned char *msg, size_t msg_size);
-int ecp_msg_get_frag(unsigned char *msg, size_t msg_size, unsigned char *frag_cnt, unsigned char *frag_tot);
+int ecp_msg_get_type(unsigned char *msg, size_t msg_size, unsigned char *mtype);
+int ecp_msg_set_type(unsigned char *msg, size_t msg_size, unsigned char mtype);
+int ecp_msg_get_frag(unsigned char *msg, size_t msg_size, unsigned char *frag_cnt, unsigned char *frag_tot, uint16_t *frag_size);
+int ecp_msg_set_frag(unsigned char *msg, size_t msg_size, unsigned char frag_cnt, unsigned char frag_tot, uint16_t frag_size);
 int ecp_msg_get_pts(unsigned char *msg, size_t msg_size, ecp_pts_t *pts);
-int ecp_msg_defrag(ECPFragIter *iter, ecp_seq_t seq, unsigned char *msg_in, size_t msg_in_size, unsigned char **msg_out, size_t *msg_out_size);
-ssize_t ecp_msg_handle(ECPConnection *conn, ecp_seq_t seq, unsigned char *msg, size_t msg_size, ECP2Buffer *bufs);
+int ecp_msg_set_pts(unsigned char *msg, size_t msg_size, ecp_pts_t pts);
+unsigned char *ecp_msg_get_content(unsigned char *msg, size_t msg_size);
+int ecp_msg_defrag(ECPFragIter *iter, ecp_seq_t seq, unsigned char mtype, unsigned char *msg_in, size_t msg_in_size, unsigned char **msg_out, size_t *msg_out_size);
 
-void ecp_pld_set_type(unsigned char *payload, unsigned char mtype);
-int ecp_pld_set_frag(unsigned char *payload, unsigned char mtype, unsigned char frag_cnt, unsigned char frag_tot);
-int ecp_pld_set_pts(unsigned char *payload, unsigned char mtype, ecp_pts_t pts);
-unsigned char *ecp_pld_get_buf(unsigned char *payload, unsigned char mtype);
-unsigned char ecp_pld_get_type(unsigned char *payload);
+int ecp_pld_get_type(unsigned char *payload, size_t pld_size, unsigned char *mtype);
+int ecp_pld_set_type(unsigned char *payload, size_t pld_size, unsigned char mtype);
+int ecp_pld_get_frag(unsigned char *payload, size_t pld_size, unsigned char *frag_cnt, unsigned char *frag_tot, uint16_t *frag_size);
+int ecp_pld_set_frag(unsigned char *payload, size_t pld_size, unsigned char frag_cnt, unsigned char frag_tot, uint16_t frag_size);
+int ecp_pld_get_pts(unsigned char *payload, size_t pld_size, ecp_pts_t *pts);
+int ecp_pld_set_pts(unsigned char *payload, size_t pld_size, ecp_pts_t pts);
+unsigned char *ecp_pld_get_buf(unsigned char *payload, size_t pld_size);
 
+ssize_t _ecp_pld_send(ECPConnection *conn, ECPBuffer *packet, unsigned char s_idx, unsigned char c_idx, ECPSeqItem *si, ECPBuffer *payload, size_t pld_size, unsigned char flags, ECPTimerItem *ti);
 ssize_t ecp_pld_send(ECPConnection *conn, ECPBuffer *packet, ECPBuffer *payload, size_t pld_size, unsigned char flags);
 ssize_t ecp_pld_send_wtimer(ECPConnection *conn, ECPBuffer *packet, ECPBuffer *payload, size_t pld_size, unsigned char flags, ECPTimerItem *ti);
-ssize_t ecp_pld_send_ll(ECPConnection *conn, ECPBuffer *packet, unsigned char s_idx, unsigned char c_idx, ECPBuffer *payload, size_t pld_size, unsigned char flags, ECPTimerItem *ti);
-ssize_t ecp_pld_send_raw(ECPSocket *sock, ECPConnection *parent, ECPNetAddr *addr, ECPBuffer *packet, unsigned char s_idx, unsigned char c_idx, ecp_dh_public_t *public, ecp_aead_key_t *shsec, unsigned char *nonce, ecp_seq_t seq, ECPBuffer *payload, size_t pld_size, unsigned char flags);
+ssize_t ecp_pld_send_tr(ECPSocket *sock, ECPNetAddr *addr, ECPConnection *parent, ECPBuffer *packet, ECPPktMeta *pkt_meta, ECPBuffer *payload, size_t pld_size, unsigned char flags);
 
 ssize_t ecp_send(ECPConnection *conn, unsigned char mtype, unsigned char *content, size_t content_size);
 ssize_t ecp_receive(ECPConnection *conn, unsigned char mtype, unsigned char *msg, size_t msg_size, ecp_cts_t timeout);
diff --git a/ecp/src/rbuf.c b/ecp/src/rbuf.c
index 05eb5ae..9a5bd8c 100644
--- a/ecp/src/rbuf.c
+++ b/ecp/src/rbuf.c
@@ -1,19 +1,32 @@
 #include "core.h"
 
+int ecp_rbuf_init(ECPRBuffer *rbuf, ECPRBMessage *msg, unsigned int msg_size) {
+    rbuf->msg = msg;
+    if (msg_size) {
+        if (msg == NULL) return ECP_ERR;
+        rbuf->msg_size = msg_size;
+        memset(rbuf->msg, 0, sizeof(ECPRBMessage) * msg_size);
+    } else {
+        rbuf->msg_size = ECP_SEQ_HALF;
+    }
+
+    return ECP_OK;
+}
+
 int ecp_rbuf_create(ECPConnection *conn, ECPRBSend *buf_s, ECPRBMessage *msg_s, unsigned int msg_s_size, ECPRBRecv *buf_r, ECPRBMessage *msg_r, unsigned int msg_r_size) {
     int rv;
-    
+
     if (buf_s) {
         rv = ecp_rbuf_send_create(conn, buf_s, msg_s, msg_s_size);
         if (rv) return rv;
-        
+
         rv = ecp_rbuf_send_start(conn);
         if (rv) {
             ecp_rbuf_send_destroy(conn);
             return rv;
         }
     }
-    
+
     if (buf_r) {
         rv = ecp_rbuf_recv_create(conn, buf_r, msg_r, msg_r_size);
         if (rv) {
@@ -21,7 +34,7 @@ int ecp_rbuf_create(ECPConnection *conn, ECPRBSend *buf_s, ECPRBMessage *msg_s,
             return rv;
         }
     }
-    
+
     return ECP_OK;
 }
 
@@ -30,19 +43,6 @@ void ecp_rbuf_destroy(ECPConnection *conn) {
     ecp_rbuf_recv_destroy(conn);
 }
 
-int ecp_rbuf_init(ECPRBuffer *rbuf, ECPRBMessage *msg, unsigned int msg_size) {
-    rbuf->msg = msg;
-    if (msg_size) {
-        if (msg == NULL) return ECP_ERR;
-        rbuf->msg_size = msg_size;
-        memset(rbuf->msg, 0, sizeof(ECPRBMessage) * msg_size);
-    } else {
-        rbuf->msg_size = ECP_SEQ_HALF;
-    }
-
-    return ECP_OK;
-}
-
 int ecp_rbuf_start(ECPRBuffer *rbuf, ecp_seq_t seq) {
     rbuf->seq_max = seq;
     rbuf->seq_start = seq + 1;
@@ -64,7 +64,7 @@ ssize_t ecp_rbuf_msg_store(ECPRBuffer *rbuf, ecp_seq_t seq, int idx, unsigned ch
 
     if (rbuf->msg == NULL) return 0;
     if (test_flags && (test_flags & rbuf->msg[idx].flags)) return ECP_ERR_RBUF_DUP;
-    
+
     if (msg_size) memcpy(rbuf->msg[idx].msg, msg, msg_size);
     rbuf->msg[idx].size = msg_size;
     rbuf->msg[idx].flags = set_flags;
@@ -78,16 +78,16 @@ ssize_t ecp_rbuf_pld_send(ECPConnection *conn, ECPBuffer *packet, ECPBuffer *pay
     ECPNetAddr addr;
     ECPSeqItem seq_item;
     ssize_t rv;
-    int _rv;    
-    
+    int _rv;
+
     _rv = ecp_seq_item_init(&seq_item);
     if (_rv) return _rv;
-    
+
     seq_item.seq = seq;
     seq_item.seq_w = 1;
     seq_item.rb_pass = 1;
 
-    rv = ecp_pack(conn, packet, ECP_ECDH_IDX_INV, ECP_ECDH_IDX_INV, payload, pld_size, &seq_item, &addr);
+    rv = ecp_pack_conn(conn, packet, ECP_ECDH_IDX_INV, ECP_ECDH_IDX_INV, &seq_item, payload, pld_size, &addr);
     if (rv < 0) return rv;
 
     rv = ecp_pkt_send(sock, &addr, packet, rv, flags);
diff --git a/ecp/src/rbuf.h b/ecp/src/rbuf.h
index 289a0c4..3a2a51b 100644
--- a/ecp/src/rbuf.h
+++ b/ecp/src/rbuf.h
@@ -10,6 +10,7 @@
 #define ECP_MTYPE_RBACK             0x04
 #define ECP_MTYPE_RBFLUSH           0x05
 #define ECP_MTYPE_RBFLUSH_PTS       0x06
+#define ECP_MTYPE_NOP               0x07
 
 #define ECP_ERR_RBUF_DUP            -100
 #define ECP_ERR_RBUF_FULL           -101
@@ -23,6 +24,16 @@ typedef uint32_t ecp_win_t;
 #include "msgq.h"
 #endif
 
+typedef struct ECPRBTimerItem {
+    unsigned char occupied;
+    ECPTimerItem item;
+} ECPRBTimerItem;
+
+typedef struct ECPRBTimer {
+    ECPRBTimerItem item[ECP_MAX_TIMER];
+    unsigned short idx_w;
+} ECPRBTimer;
+
 typedef struct ECPRBMessage {
     unsigned char msg[ECP_MAX_PKT];
     ssize_t size;
@@ -38,17 +49,6 @@ typedef struct ECPRBuffer {
     ECPRBMessage *msg;
 } ECPRBuffer;
 
-
-typedef struct ECPRBTimerItem {
-    unsigned char occupied;
-    ECPTimerItem item;
-} ECPRBTimerItem;
-
-typedef struct ECPRBTimer {
-    ECPRBTimerItem item[ECP_MAX_TIMER];
-    unsigned short idx_w;
-} ECPRBTimer;
-
 typedef struct ECPRBRecv {
     unsigned char flags;
     unsigned char timer_pts;
@@ -89,17 +89,15 @@ typedef struct ECPConnRBuffer {
     ECPRBSend *send;
 } ECPConnRBuffer;
 
-
 int ecp_rbuf_init(ECPRBuffer *rbuf, ECPRBMessage *msg, unsigned int msg_size);
+int ecp_rbuf_create(struct ECPConnection *conn, ECPRBSend *buf_s, ECPRBMessage *msg_s, unsigned int msg_s_size, ECPRBRecv *buf_r, ECPRBMessage *msg_r, unsigned int msg_r_size);
+void ecp_rbuf_destroy(struct ECPConnection *conn);
 int ecp_rbuf_start(ECPRBuffer *rbuf, ecp_seq_t seq);
 int ecp_rbuf_msg_idx(ECPRBuffer *rbuf, ecp_seq_t seq);
 
 ssize_t ecp_rbuf_msg_store(ECPRBuffer *rbuf, ecp_seq_t seq, int idx, unsigned char *msg, size_t msg_size, unsigned char test_flags, unsigned char set_flags);
 ssize_t ecp_rbuf_pld_send(struct ECPConnection *conn, struct ECPBuffer *packet, struct ECPBuffer *payload, size_t pld_size, unsigned char flags, ecp_seq_t seq);
 
-int ecp_rbuf_create(struct ECPConnection *conn, ECPRBSend *buf_s, ECPRBMessage *msg_s, unsigned int msg_s_size, ECPRBRecv *buf_r, ECPRBMessage *msg_r, unsigned int msg_r_size);
-void ecp_rbuf_destroy(struct ECPConnection *conn);
-
 int ecp_rbuf_recv_create(struct ECPConnection *conn, ECPRBRecv *buf, ECPRBMessage *msg, unsigned int msg_size);
 void ecp_rbuf_recv_destroy(struct ECPConnection *conn);
 int ecp_rbuf_recv_start(struct ECPConnection *conn, ecp_seq_t seq);
diff --git a/ecp/src/rbuf_recv.c b/ecp/src/rbuf_recv.c
index e949da7..17bbd01 100644
--- a/ecp/src/rbuf_recv.c
+++ b/ecp/src/rbuf_recv.c
@@ -8,13 +8,18 @@
 static ssize_t msg_store(ECPConnection *conn, ecp_seq_t seq, unsigned char *msg, size_t msg_size, ECP2Buffer *b) {
     ECPRBRecv *buf = conn->rbuf.recv;
     unsigned char flags = ECP_RBUF_FLAG_IN_RBUF;
-    unsigned char mtype = ecp_msg_get_type(msg) & ECP_MTYPE_MASK;
+    unsigned char mtype;
     ssize_t rv;
+    int _rv;
+
+    _rv = ecp_msg_get_type(msg, msg_size, &mtype);
+    if (_rv) return _rv;
 
+    mtype &= ECP_MTYPE_MASK;
     if (mtype < ECP_MAX_MTYPE_SYS) flags |= ECP_RBUF_FLAG_SYS;
 
-#ifdef ECP_WITH_MSGQ
     if (buf->flags & ECP_RBUF_FLAG_MSGQ) {
+#ifdef ECP_WITH_MSGQ
         ecp_seq_t seq_offset;
         int _rv = ECP_OK;
 
@@ -24,14 +29,14 @@ static ssize_t msg_store(ECPConnection *conn, ecp_seq_t seq, unsigned char *msg,
         pthread_mutex_unlock(&buf->msgq.mutex);
 
         if (_rv) return _rv;
-    }
 #endif
+    }
 
     rv = ecp_rbuf_msg_store(&buf->rbuf, seq, -1, msg, msg_size, ECP_RBUF_FLAG_IN_RBUF | ECP_RBUF_FLAG_IN_MSGQ, flags);
     if (rv < 0) return rv;
 
     if (ECP_SEQ_LT(buf->rbuf.seq_max, seq)) buf->rbuf.seq_max = seq;
-    if (flags & ECP_RBUF_FLAG_SYS) ecp_msg_handle(conn, seq, msg, msg_size, b);
+    if (flags & ECP_RBUF_FLAG_SYS) ecp_conn_handle_msg(conn, seq, msg, msg_size, b);
 
     return rv;
 }
@@ -62,9 +67,10 @@ static void msg_flush(ECPConnection *conn, ECP2Buffer *b) {
                 ecp_seq_t seq = buf->rbuf.seq_start + i;
                 unsigned char frag_tot;
                 unsigned char frag_cnt;
+                uint16_t frag_size;
                 int rv;
 
-                rv = ecp_msg_get_frag(buf->rbuf.msg[idx].msg, buf->rbuf.msg[idx].size, &frag_cnt, &frag_tot);
+                rv = ecp_msg_get_frag(buf->rbuf.msg[idx].msg, buf->rbuf.msg[idx].size, &frag_cnt, &frag_tot, &frag_size);
                 if (!rv && (frag_cnt != 0) && (seq != seq_next)) {
                     ecp_seq_t seq_fend = seq + (ecp_seq_t)(frag_tot - frag_cnt - 1);
 
@@ -98,12 +104,16 @@ static void msg_flush(ECPConnection *conn, ECP2Buffer *b) {
                 seq_next = seq + 1;
                 if (buf->flags & ECP_RBUF_FLAG_MSGQ) {
 #ifdef ECP_WITH_MSGQ
-                    rv = ecp_conn_msgq_push(conn, seq, ecp_msg_get_type(buf->rbuf.msg[idx].msg));
+                    unsigned char mtype;
+
+                    rv = ecp_msg_get_type(buf->rbuf.msg[idx].msg, buf->rbuf.msg[idx].size, &mtype);
+                    if (!rv) rv = ecp_conn_msgq_push(conn, seq, mtype);
                     if (rv) break;
+
                     buf->rbuf.msg[idx].flags |= ECP_RBUF_FLAG_IN_MSGQ;
 #endif
                 } else {
-                    ecp_msg_handle(conn, seq, buf->rbuf.msg[idx].msg, buf->rbuf.msg[idx].size, b);
+                    ecp_conn_handle_msg(conn, seq, buf->rbuf.msg[idx].msg, buf->rbuf.msg[idx].size, b);
                 }
             }
             buf->rbuf.msg[idx].flags &= ~ECP_RBUF_FLAG_IN_RBUF;
@@ -132,7 +142,7 @@ static int ack_send(ECPConnection *conn) {
     ECPBuffer payload;
     unsigned char pkt_buf[ECP_SIZE_PKT_BUF(sizeof(ecp_seq_t) + sizeof(ecp_ack_t), ECP_MTYPE_RBACK, conn)];
     unsigned char pld_buf[ECP_SIZE_PLD_BUF(sizeof(ecp_seq_t) + sizeof(ecp_ack_t), ECP_MTYPE_RBACK, conn)];
-    unsigned char *buf_ = ecp_pld_get_buf(pld_buf, ECP_MTYPE_RBACK);
+    unsigned char *_buf;
     ssize_t rv;
 
     packet.buffer = pkt_buf;
@@ -140,15 +150,16 @@ static int ack_send(ECPConnection *conn) {
     payload.buffer = pld_buf;
     payload.size = ECP_SIZE_PLD_BUF(sizeof(ecp_seq_t) + sizeof(ecp_ack_t), ECP_MTYPE_RBACK, conn);
 
-    ecp_pld_set_type(pld_buf, ECP_MTYPE_RBACK);
-    buf_[0] = (buf->seq_ack & 0xFF000000) >> 24;
-    buf_[1] = (buf->seq_ack & 0x00FF0000) >> 16;
-    buf_[2] = (buf->seq_ack & 0x0000FF00) >> 8;
-    buf_[3] = (buf->seq_ack & 0x000000FF);
-    buf_[4] = (buf->ack_map & 0xFF000000) >> 24;
-    buf_[5] = (buf->ack_map & 0x00FF0000) >> 16;
-    buf_[6] = (buf->ack_map & 0x0000FF00) >> 8;
-    buf_[7] = (buf->ack_map & 0x000000FF);
+    ecp_pld_set_type(payload.buffer, payload.size, ECP_MTYPE_RBACK);
+    _buf = ecp_pld_get_buf(payload.buffer, payload.size);
+    _buf[0] = (buf->seq_ack & 0xFF000000) >> 24;
+    _buf[1] = (buf->seq_ack & 0x00FF0000) >> 16;
+    _buf[2] = (buf->seq_ack & 0x0000FF00) >> 8;
+    _buf[3] = (buf->seq_ack & 0x000000FF);
+    _buf[4] = (buf->ack_map & 0xFF000000) >> 24;
+    _buf[5] = (buf->ack_map & 0x00FF0000) >> 16;
+    _buf[6] = (buf->ack_map & 0x0000FF00) >> 8;
+    _buf[7] = (buf->ack_map & 0x000000FF);
 
     rv = ecp_rbuf_pld_send(conn, &packet, &payload, ECP_SIZE_PLD(sizeof(ecp_seq_t) + sizeof(ecp_ack_t), ECP_MTYPE_RBACK), 0, 0);
     if (rv < 0) return rv;
@@ -258,12 +269,12 @@ int ecp_rbuf_recv_start(ECPConnection *conn, ecp_seq_t seq) {
     rv = ecp_rbuf_start(&buf->rbuf, seq);
     if (rv) return rv;
 
-#ifdef ECP_WITH_MSGQ
     if (buf->flags & ECP_RBUF_FLAG_MSGQ) {
+#ifdef ECP_WITH_MSGQ
         rv = ecp_conn_msgq_start(&buf->msgq, seq);
         if (rv) return rv;
-    }
 #endif
+    }
 
     return ECP_OK;
 }
@@ -290,10 +301,14 @@ ssize_t ecp_rbuf_recv_store(ECPConnection *conn, ecp_seq_t seq, unsigned char *m
     ECPRBRecv *buf = conn->rbuf.recv;
     ecp_seq_t ack_pkt = 0;
     ssize_t rv;
+    int _rv;
     unsigned char mtype;
 
-    mtype = ecp_msg_get_type(msg) & ECP_MTYPE_MASK;
-    if ((mtype == ECP_MTYPE_RBACK) || (mtype == ECP_MTYPE_RBFLUSH)) return ecp_msg_handle(conn, seq, msg, msg_size, b);
+    _rv = ecp_msg_get_type(msg, msg_size, &mtype);
+    if (_rv) return _rv;
+
+    mtype &= ECP_MTYPE_MASK;
+    if ((mtype == ECP_MTYPE_RBACK) || (mtype == ECP_MTYPE_RBFLUSH)) return ecp_conn_handle_msg(conn, seq, msg, msg_size, b);
 
     if (ECP_SEQ_LT(buf->rbuf.seq_max, seq)) {
         ack_pkt = seq - buf->rbuf.seq_max;
@@ -321,7 +336,7 @@ ssize_t ecp_rbuf_recv_store(ECPConnection *conn, ecp_seq_t seq, unsigned char *m
                 rv = msg_store(conn, seq, msg, msg_size, b);
                 if (rv < 0) return rv;
             } else {
-                ecp_msg_handle(conn, seq, msg, msg_size, b);
+                ecp_conn_handle_msg(conn, seq, msg, msg_size, b);
                 rv = msg_size;
                 buf->rbuf.seq_max++;
                 buf->rbuf.seq_start++;
diff --git a/ecp/src/rbuf_send.c b/ecp/src/rbuf_send.c
index 13b314e..a680285 100644
--- a/ecp/src/rbuf_send.c
+++ b/ecp/src/rbuf_send.c
@@ -14,7 +14,7 @@ static ssize_t flush_send(ECPConnection *conn, ECPTimerItem *ti) {
     payload.buffer = pld_buf;
     payload.size = ECP_SIZE_PLD_BUF(0, ECP_MTYPE_RBFLUSH, conn);
 
-    ecp_pld_set_type(pld_buf, ECP_MTYPE_RBFLUSH);
+    ecp_pld_set_type(payload.buffer, payload.size, ECP_MTYPE_RBFLUSH);
     if (ti == NULL) {
         ECPTimerItem _ti;
         int rv;
@@ -153,7 +153,7 @@ ssize_t ecp_rbuf_handle_ack(ECPConnection *conn, ecp_seq_t seq, unsigned char mt
                             payload.buffer = pld_buf;
                             payload.size = ECP_SIZE_PLD_BUF(0, ECP_MTYPE_NOP, conn);
 
-                            ecp_pld_set_type(pld_buf, ECP_MTYPE_NOP);
+                            ecp_pld_set_type(payload.buffer, payload.size, ECP_MTYPE_NOP);
                             ecp_rbuf_pld_send(conn, &packet, &payload, ECP_SIZE_PLD(0, ECP_MTYPE_NOP), 0, seq_ack + i);
                         } else {
                             ECPBuffer packet;
@@ -305,12 +305,14 @@ int ecp_rbuf_send_flush(ECPConnection *conn) {
 }
 
 int ecp_rbuf_pkt_prep(ECPRBSend *buf, ECPSeqItem *si, unsigned char mtype) {
+    int idx;
+
     if (si->rb_pass) return ECP_OK;
 
 #ifdef ECP_WITH_PTHREAD
     pthread_mutex_lock(&buf->mutex);
 #endif
-    int idx = ecp_rbuf_msg_idx(&buf->rbuf, si->seq);
+    idx = ecp_rbuf_msg_idx(&buf->rbuf, si->seq);
 #ifdef ECP_WITH_PTHREAD
     pthread_mutex_unlock(&buf->mutex);
 #endif
diff --git a/ecp/src/vconn/vconn.c b/ecp/src/vconn/vconn.c
index a4109a8..286a79a 100644
--- a/ecp/src/vconn/vconn.c
+++ b/ecp/src/vconn/vconn.c
@@ -81,15 +81,15 @@ static ssize_t _vconn_send_open(ECPConnection *conn, ECPTimerItem *ti) {
     payload.buffer = pld_buf;
     payload.size = ECP_SIZE_PLD_BUF(0, ECP_MTYPE_KGET_REQ, conn);
 
-    ecp_pld_set_type(pld_buf, ECP_MTYPE_KGET_REQ);
-    return ecp_pld_send_ll(conn, &packet, ECP_ECDH_IDX_PERMA, ECP_ECDH_IDX_INV, &payload, ECP_SIZE_PLD(0, ECP_MTYPE_KGET_REQ), 0, ti);
+    ecp_pld_set_type(payload.buffer, payload.size, ECP_MTYPE_KGET_REQ);
+    return _ecp_pld_send(conn, &packet, ECP_ECDH_IDX_PERMA, ECP_ECDH_IDX_INV, NULL, &payload, ECP_SIZE_PLD(0, ECP_MTYPE_KGET_REQ), 0, ti);
 }
 
 static ssize_t vconn_open(ECPConnection *conn) {
     ECPTimerItem ti;
     ECPVConnection *conn_v = (ECPVConnection *)conn;
     ECPConnection *conn_next = conn_v->next;
-    ssize_t rv
+    ssize_t rv;
 
     if (conn_next == NULL) return ECP_ERR;
 
@@ -195,7 +195,7 @@ static ssize_t vconn_handle_relay(ECPConnection *conn, ecp_seq_t seq, unsigned c
     payload.buffer = msg - ECP_SIZE_PLD_HDR - 1;
     payload.size = b->payload->size - (payload.buffer - b->payload->buffer);
 
-    ecp_pld_set_type(payload.buffer, ECP_MTYPE_EXEC);
+    ecp_pld_set_type(payload.buffer, payload.size, ECP_MTYPE_EXEC);
     rv = ecp_pld_send(conn_out, b->packet, &payload, ECP_SIZE_PLD_HDR+1+size, ECP_SEND_FLAG_REPLY);
 
 #ifdef ECP_WITH_PTHREAD
@@ -259,7 +259,7 @@ static ssize_t _vlink_send_open(ECPConnection *conn, ECPTimerItem *ti) {
     ECPBuffer payload;
     unsigned char pkt_buf[ECP_SIZE_PKT_BUF(ECP_ECDH_SIZE_KEY+1, ECP_MTYPE_OPEN_REQ, conn)];
     unsigned char pld_buf[ECP_SIZE_PLD_BUF(ECP_ECDH_SIZE_KEY+1, ECP_MTYPE_OPEN_REQ, conn)];
-    unsigned char *buf = ecp_pld_get_buf(pld_buf, ECP_MTYPE_OPEN_REQ);
+    unsigned char *buf;
 
     packet.buffer = pkt_buf;
     packet.size = ECP_SIZE_PKT_BUF(ECP_ECDH_SIZE_KEY+1, ECP_MTYPE_OPEN_REQ, conn);
@@ -267,7 +267,8 @@ static ssize_t _vlink_send_open(ECPConnection *conn, ECPTimerItem *ti) {
     payload.size = ECP_SIZE_PLD_BUF(ECP_ECDH_SIZE_KEY+1, ECP_MTYPE_OPEN_REQ, conn);
 
     // XXX server should verify perma_key
-    ecp_pld_set_type(pld_buf, ECP_MTYPE_OPEN_REQ);
+    ecp_pld_set_type(payload.buffer, payload.size, ECP_MTYPE_OPEN_REQ);
+    buf = ecp_pld_get_buf(payload.buffer, payload.size);
     buf[0] = conn->type;
     memcpy(buf+1, ecp_cr_dh_pub_get_buf(&sock->key_perma.public), ECP_ECDH_SIZE_KEY);
 
@@ -367,7 +368,7 @@ static ssize_t vlink_handle_relay(ECPConnection *conn, ecp_seq_t seq, unsigned c
     payload.buffer = msg - ECP_SIZE_PLD_HDR - 1;
     payload.size = b->payload->size - (payload.buffer - b->payload->buffer);
 
-    ecp_pld_set_type(payload.buffer, ECP_MTYPE_EXEC);
+    ecp_pld_set_type(payload.buffer, payload.size, ECP_MTYPE_EXEC);
     rv = ecp_pld_send(conn, b->packet, &payload, ECP_SIZE_PLD_HDR+1+size, ECP_SEND_FLAG_REPLY);
 
 #ifdef ECP_WITH_PTHREAD
@@ -393,8 +394,8 @@ static ssize_t vconn_set_msg(ECPConnection *conn, ECPBuffer *payload, unsigned c
         if (payload->size < ECP_SIZE_PLD_HDR + 3 + 2 * ECP_ECDH_SIZE_KEY) return ECP_ERR;
         if (conn_next == NULL) return ECP_ERR;
 
-        ecp_pld_set_type(payload->buffer, ECP_MTYPE_OPEN_REQ);
-        buf = ecp_pld_get_buf(payload->buffer, 0);
+        ecp_pld_set_type(payload->buffer, payload->size, ECP_MTYPE_OPEN_REQ);
+        buf = ecp_pld_get_buf(payload->buffer, payload->size);
 
         buf[0] = ECP_CTYPE_VCONN;
         rv = ecp_conn_dhkey_get_curr(conn_next, NULL, buf+1);
@@ -407,104 +408,138 @@ static ssize_t vconn_set_msg(ECPConnection *conn, ECPBuffer *payload, unsigned c
     } else {
         if (payload->size < ECP_SIZE_PLD_HDR + 1) return ECP_ERR;
 
-        ecp_pld_set_type(payload->buffer, ECP_MTYPE_RELAY);
+        ecp_pld_set_type(payload->buffer, payload->size, ECP_MTYPE_RELAY);
 
         return ECP_SIZE_PLD_HDR + 1;
     }
 
 }
 
-/* Memory limited version: */
-ssize_t ecp_pack(ECPConnection *conn, ECPBuffer *packet, unsigned char s_idx, unsigned char c_idx, ECPBuffer *payload, size_t pld_size, ECPSeqItem *si, ECPNetAddr *addr) {
+#ifdef ECP_MEM_TINY
+/* Memory limited version */
+
+ssize_t ecp_pack(ECPContext *ctx, ECPConnection *parent, ECPBuffer *packet, ECPPktMeta *pkt_meta, ECPBuffer *payload, size_t pld_size, ECPNetAddr *addr) {
     if ((packet == NULL) || (packet->buffer == NULL)) return ECP_ERR;
     if ((payload == NULL) || (payload->buffer == NULL)) return ECP_ERR;
 
-    if (conn->parent) {
-        unsigned char mtype = ecp_pld_get_type(payload->buffer);
-        ssize_t rv, hdr_size = vconn_set_msg(conn->parent, packet, mtype);
+    if (parent) {
+        unsigned char mtype;
+        ssize_t rv, hdr_size;
+        int _rv;
+
+        _rv = ecp_pld_get_type(payload->buffer, payload->size, &mtype);
+        if (_rv) return _rv;
+
+        hdr_size = vconn_set_msg(parent, packet, mtype);
         if (hdr_size < 0) return hdr_size;
 
-        rv = ecp_conn_pack(conn, packet->buffer+hdr_size, packet->size-hdr_size, s_idx, c_idx, payload->buffer, pld_size, si, NULL);
+        rv = _ecp_pack(ctx, packet->buffer+hdr_size, packet->size-hdr_size, pkt_meta, payload->buffer, pld_size);
         if (rv < 0) return rv;
 
         if (payload->size < rv+hdr_size) return ECP_ERR;
         memcpy(payload->buffer, packet->buffer, rv+hdr_size);
 
-        return ecp_pack(conn->parent, packet, ECP_ECDH_IDX_INV, ECP_ECDH_IDX_INV, payload, rv+hdr_size, NULL, addr);
+        return ecp_pack_conn(parent, packet, ECP_ECDH_IDX_INV, ECP_ECDH_IDX_INV, NULL, payload, rv+hdr_size, addr);
     } else {
-        return ecp_conn_pack(conn, packet->buffer, packet->size, s_idx, c_idx, payload->buffer, pld_size, si, addr);
+        return _ecp_pack(ctx, packet->buffer, packet->size, pkt_meta, payload->buffer, pld_size);
     }
 }
 
-ssize_t ecp_pack_raw(ECPSocket *sock, ECPConnection *parent, ECPBuffer *packet, unsigned char s_idx, unsigned char c_idx, ecp_dh_public_t *public, ecp_aead_key_t *shsec, unsigned char *nonce, ecp_seq_t seq, ECPBuffer *payload, size_t pld_size, ECPNetAddr *addr) {
-    ECPContext *ctx = sock->ctx;
+#else
 
+ssize_t ecp_pack(ECPContext *ctx, ECPConnection *parent, ECPBuffer *packet, ECPPktMeta *pkt_meta, ECPBuffer *payload, size_t pld_size, ECPNetAddr *addr) {
     if ((packet == NULL) || (packet->buffer == NULL)) return ECP_ERR;
     if ((payload == NULL) || (payload->buffer == NULL)) return ECP_ERR;
 
     if (parent) {
-        unsigned char mtype = ecp_pld_get_type(payload->buffer);
-        ssize_t rv, hdr_size = vconn_set_msg(parent, packet, mtype);
+        ECPBuffer _payload;
+        unsigned char pld_buf[ECP_MAX_PLD];
+        unsigned char mtype;
+        ssize_t rv, hdr_size;
+        int _rv;
+
+        _payload.buffer = pld_buf;
+        _payload.size = ECP_MAX_PLD;
+
+        _rv = ecp_pld_get_type(payload->buffer, payload->size, &mtype);
+        if (_rv) return _rv;
+
+        hdr_size = vconn_set_msg(parent, &_payload, mtype);
         if (hdr_size < 0) return hdr_size;
 
-        rv = ecp_pkt_pack(ctx, packet->buffer+hdr_size, packet->size-hdr_size, s_idx, c_idx, public, shsec, nonce, seq, payload->buffer, pld_size);
+        rv = _ecp_pack(ctx, _payload.buffer+hdr_size, _payload.size-hdr_size, pkt_meta, payload->buffer, pld_size);
         if (rv < 0) return rv;
 
-        if (payload->size < rv+hdr_size) return ECP_ERR;
-        memcpy(payload->buffer, packet->buffer, rv+hdr_size);
-
-        return ecp_pack(parent, packet, ECP_ECDH_IDX_INV, ECP_ECDH_IDX_INV, payload, rv+hdr_size, NULL, addr);
+        return ecp_pack_conn(parent, packet, ECP_ECDH_IDX_INV, ECP_ECDH_IDX_INV, NULL, &_payload, rv+hdr_size, addr);
     } else {
-        return ecp_pkt_pack(ctx, packet->buffer, packet->size, s_idx, c_idx, public, shsec, nonce, seq, payload->buffer, pld_size);
+        return _ecp_pack(ctx, packet->buffer, packet->size, pkt_meta, payload->buffer, pld_size);
     }
 }
 
-/* Non memory limited version: */
-/*
-static ssize_t ecp_pack(ECPConnection *conn, ECPBuffer *packet, unsigned char s_idx, unsigned char c_idx, ECPBuffer *payload, size_t pld_size, ECPSeqItem *si, ECPNetAddr *addr) {
+#endif
+
+#ifdef ECP_MEM_TINY
+/* Memory limited version */
+
+ssize_t ecp_pack_conn(ECPConnection *conn, ECPBuffer *packet, unsigned char s_idx, unsigned char c_idx, ECPSeqItem *si, ECPBuffer *payload, size_t pld_size, ECPNetAddr *addr) {
+    if ((packet == NULL) || (packet->buffer == NULL)) return ECP_ERR;
+    if ((payload == NULL) || (payload->buffer == NULL)) return ECP_ERR;
+
     if (conn->parent) {
-        ECPBuffer payload_;
-        unsigned char pld_buf[ECP_MAX_PLD];
+        unsigned char mtype;
+        ssize_t rv, hdr_size;
+        int _rv;
 
-        payload_.buffer = pld_buf;
-        payload_.size = ECP_MAX_PLD;
+        _rv = ecp_pld_get_type(payload->buffer, payload->size, &mtype);
+        if (_rv) return _rv;
 
-        unsigned char mtype = ecp_pld_get_type(payload->buffer);
-        ssize_t rv, hdr_size = vconn_set_msg(conn->parent, &payload_, mtype);
+        hdr_size = vconn_set_msg(conn->parent, packet, mtype);
         if (hdr_size < 0) return hdr_size;
 
-        rv = ecp_conn_pack(conn, payload_.buffer+hdr_size, payload_.size-hdr_size, s_idx, c_idx, payload->buffer, pld_size, si, NULL);
+        rv = _ecp_pack_conn(conn, packet->buffer+hdr_size, packet->size-hdr_size, s_idx, c_idx, si, payload->buffer, pld_size, NULL);
         if (rv < 0) return rv;
 
-        return ecp_pack(conn->parent, packet, ECP_ECDH_IDX_INV, ECP_ECDH_IDX_INV, &payload_, rv+hdr_size, NULL, addr);
+        if (payload->size < rv+hdr_size) return ECP_ERR;
+        memcpy(payload->buffer, packet->buffer, rv+hdr_size);
+
+        return ecp_pack_conn(conn->parent, packet, ECP_ECDH_IDX_INV, ECP_ECDH_IDX_INV, NULL, payload, rv+hdr_size, addr);
     } else {
-        return ecp_conn_pack(conn, packet->buffer, packet->size, s_idx, c_idx, payload->buffer, pld_size, si, addr);
+        return _ecp_pack_conn(conn, packet->buffer, packet->size, s_idx, c_idx, si, payload->buffer, pld_size, addr);
     }
 }
 
-static ssize_t ecp_pack_raw(ECPSocket *sock, ECPConnection *parent, ECPBuffer *packet, unsigned char s_idx, unsigned char c_idx, ecp_dh_public_t *public, ecp_aead_key_t *shsec, unsigned char *nonce, ecp_seq_t seq, ECPBuffer *payload, size_t pld_size, ECPNetAddr *addr) {
-    ECPContext *ctx = sock->ctx;
+#else
 
-    if (parent) {
-        ECPBuffer payload_;
+ssize_t ecp_pack_conn(ECPConnection *conn, ECPBuffer *packet, unsigned char s_idx, unsigned char c_idx, ECPSeqItem *si, ECPBuffer *payload, size_t pld_size, ECPNetAddr *addr) {
+    if ((packet == NULL) || (packet->buffer == NULL)) return ECP_ERR;
+    if ((payload == NULL) || (payload->buffer == NULL)) return ECP_ERR;
+
+    if (conn->parent) {
+        ECPBuffer _payload;
         unsigned char pld_buf[ECP_MAX_PLD];
+        unsigned char mtype;
+        ssize_t rv, hdr_size;
+        int _rv;
 
-        payload_.buffer = pld_buf;
-        payload_.size = ECP_MAX_PLD;
+        _payload.buffer = pld_buf;
+        _payload.size = ECP_MAX_PLD;
 
-        unsigned char mtype = ecp_pld_get_type(payload->buffer);
-        ssize_t rv, hdr_size = vconn_set_msg(parent, &payload_, mtype);
+        _rv = ecp_pld_get_type(payload->buffer, payload->size, &mtype);
+        if (_rv) return _rv;
+
+        hdr_size = vconn_set_msg(conn->parent, &_payload, mtype);
         if (hdr_size < 0) return hdr_size;
 
-        rv = ecp_pkt_pack(ctx, payload_.buffer+hdr_size, payload_.size-hdr_size, s_idx, c_idx, public, shsec, nonce, seq, payload->buffer, pld_size);
+        rv = _ecp_pack_conn(conn, _payload.buffer+hdr_size, _payload.size-hdr_size, s_idx, c_idx, si, payload->buffer, pld_size, NULL);
         if (rv < 0) return rv;
 
-        return ecp_pack(parent, packet, ECP_ECDH_IDX_INV, ECP_ECDH_IDX_INV, &payload_, rv+hdr_size, NULL, addr);
+        return ecp_pack_conn(conn->parent, packet, ECP_ECDH_IDX_INV, ECP_ECDH_IDX_INV, NULL, &_payload, rv+hdr_size, addr);
     } else {
-        return ecp_pkt_pack(ctx, packet->buffer, packet->size, s_idx, c_idx, public, shsec, nonce, seq, payload->buffer, pld_size);
+        return _ecp_pack_conn(conn, packet->buffer, packet->size, s_idx, c_idx, si, payload->buffer, pld_size, addr);
     }
 }
-*/
+
+#endif
 
 int ecp_vconn_ctx_init(ECPContext *ctx) {
     int rv;
@@ -614,8 +649,8 @@ static ssize_t _vconn_send_kget(ECPConnection *conn, ECPTimerItem *ti) {
     payload.buffer = pld_buf;
     payload.size = ECP_SIZE_PLD_BUF(0, ECP_MTYPE_KGET_REQ, conn);
 
-    ecp_pld_set_type(pld_buf, ECP_MTYPE_KGET_REQ);
-    return ecp_pld_send_ll(conn, &packet, ECP_ECDH_IDX_PERMA, ECP_ECDH_IDX_INV, &payload, ECP_SIZE_PLD(0, ECP_MTYPE_KGET_REQ), 0, ti);
+    ecp_pld_set_type(payload.buffer, payload.size, ECP_MTYPE_KGET_REQ);
+    return _ecp_pld_send(conn, &packet, ECP_ECDH_IDX_PERMA, ECP_ECDH_IDX_INV, NULL, &payload, ECP_SIZE_PLD(0, ECP_MTYPE_KGET_REQ), 0, ti);
 }
 
 int ecp_vconn_open(ECPConnection *conn, ECPNode *conn_node, ECPVConnection vconn[], ECPNode vconn_node[], int size) {