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Diffstat (limited to 'src/ipcpd/normal/dt_pci.c')
-rw-r--r--src/ipcpd/normal/dt_pci.c149
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 <dimitri.staessens@ugent.be>
+ * Sander Vrijders <sander.vrijders@ugent.be>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 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);
+}