ipcpd: normal: Split connection establishment

Connection establishment was done at the same time as flow
allocation. This splits it more cleanly, and allows to re-use the DT
AE for other purposes.

1 files changed, 149 insertions, 0 deletions

diff --git a/src/ipcpd/normal/dt_pci.c b/src/ipcpd/normal/dt_pci.c
new file mode 100644
index 00000000..0e596803
--- /dev/null
+++ b/src/ipcpd/normal/dt_pci.c
@@ -0,0 +1,149 @@
+/*
+ * Ouroboros - Copyright (C) 2016 - 2017
+ *
+ * Protocol Control Information of Data Transfer AE
+ *
+ *    Dimitri Staessens <[email protected]>
+ *    Sander Vrijders   <[email protected]>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <ouroboros/config.h>
+#include <ouroboros/errno.h>
+#include <ouroboros/crc32.h>
+#include <ouroboros/rib.h>
+
+#include "dt_const.h"
+#include "dt_pci.h"
+#include "ribconfig.h"
+
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+
+#define PDU_TYPE_SIZE 1
+#define QC_SIZE       1
+#define DEFAULT_TTL   60
+#define TTL_SIZE      1
+#define CHK_SIZE      4
+
+struct {
+        struct dt_const dtc;
+        size_t          head_size;
+        size_t          tail_size;
+
+        /* offsets */
+        size_t          qc_o;
+        size_t          ttl_o;
+        size_t          pdu_type_o;
+} dt_pci_info;
+
+int dt_pci_init(void)
+{
+        /* read dt constants from the RIB */
+        if (rib_read(BOOT_PATH "/dt/const/addr_size",
+                     &dt_pci_info.dtc.addr_size,
+                     sizeof(dt_pci_info.dtc.addr_size)) < 0 ||
+            rib_read(BOOT_PATH "/dt/const/has_ttl",
+                     &dt_pci_info.dtc.has_ttl,
+                     sizeof(dt_pci_info.dtc.has_ttl)) < 0 ||
+            rib_read(BOOT_PATH "/dt/const/has_chk",
+                     &dt_pci_info.dtc.has_chk,
+                     sizeof(dt_pci_info.dtc.has_chk)) < 0)
+                return -1;
+
+        dt_pci_info.qc_o = dt_pci_info.dtc.addr_size;
+        dt_pci_info.ttl_o = dt_pci_info.qc_o + QC_SIZE;
+
+        dt_pci_info.head_size = dt_pci_info.ttl_o + PDU_TYPE_SIZE;
+
+        if (dt_pci_info.dtc.has_ttl)
+                dt_pci_info.head_size += TTL_SIZE;
+
+        dt_pci_info.tail_size = dt_pci_info.dtc.has_chk ? CHK_SIZE : 0;
+
+        return 0;
+}
+
+void dt_pci_fini(void) {
+        return;
+}
+
+int dt_pci_ser(struct shm_du_buff * sdb,
+               struct dt_pci *      dt_pci)
+{
+        uint8_t * head;
+        uint8_t * tail;
+        uint8_t ttl = DEFAULT_TTL;
+
+        assert(sdb);
+        assert(dt_pci);
+
+        head = shm_du_buff_head_alloc(sdb, dt_pci_info.head_size);
+        if (head == NULL)
+                return -EPERM;
+
+        /* FIXME: Add check and operations for Big Endian machines */
+        memcpy(head, &dt_pci->dst_addr, dt_pci_info.dtc.addr_size);
+        memcpy(head + dt_pci_info.qc_o, &dt_pci->qc, QC_SIZE);
+        if (dt_pci_info.dtc.has_ttl)
+                memcpy(head + dt_pci_info.ttl_o, &ttl, TTL_SIZE);
+        memcpy(head + dt_pci_info.pdu_type_o, &dt_pci->pdu_type, PDU_TYPE_SIZE);
+
+        if (dt_pci_info.dtc.has_chk) {
+                tail = shm_du_buff_tail_alloc(sdb, dt_pci_info.tail_size);
+                if (tail == NULL) {
+                        shm_du_buff_head_release(sdb, dt_pci_info.head_size);
+                        return -EPERM;
+                }
+
+                *((uint32_t *) tail) = 0;
+                crc32((uint32_t *) tail, head, tail - head);
+        }
+
+        return 0;
+}
+
+void dt_pci_des(struct shm_du_buff * sdb,
+                struct dt_pci *      dt_pci)
+{
+        uint8_t * head;
+
+        assert(sdb);
+        assert(dt_pci);
+
+        head = shm_du_buff_head(sdb);
+
+        /* FIXME: Add check and operations for Big Endian machines */
+        memcpy(&dt_pci->dst_addr, head, dt_pci_info.dtc.addr_size);
+        memcpy(&dt_pci->qc, head + dt_pci_info.qc_o, QC_SIZE);
+
+        if (dt_pci_info.dtc.has_ttl) {
+                --*(head + dt_pci_info.ttl_o); /* decrease TTL */
+                memcpy(&dt_pci->ttl, head + dt_pci_info.ttl_o, TTL_SIZE);
+        } else {
+                dt_pci->ttl = 1;
+        }
+
+        memcpy(&dt_pci->pdu_type, head + dt_pci_info.pdu_type_o, PDU_TYPE_SIZE);
+}
+
+void dt_pci_shrink(struct shm_du_buff * sdb)
+{
+        assert(sdb);
+
+        shm_du_buff_head_release(sdb, dt_pci_info.head_size);
+        shm_du_buff_tail_release(sdb, dt_pci_info.tail_size);
+}