Merged in dstaesse/ouroboros/be-pci (pull request #12)

PCI structure for IPCP

1 files changed, 142 insertions, 0 deletions

diff --git a/src/ipcpd/pci.c b/src/ipcpd/pci.c
new file mode 100644
index 00000000..19c42e53
--- /dev/null
+++ b/src/ipcpd/pci.c
@@ -0,0 +1,142 @@
+/*
+ * Ouroboros - Copyright (C) 2016
+ *
+ * Protocol Control Information
+ *
+ *    Dimitri Staessens <dimitri.staessens@intec.ugent.be>
+ *    Sander Vrijders   <sander.vrijders@intec.ugent.be>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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 "pci.h"
+#include <malloc.h>
+#include <errno.h>
+
+#define PCI_HEAD_SIZE(a, b) a.addr_size * 2 +  \
+        a.cep_id_size * 2 +                    \
+        a.pdu_length_size +                    \
+        b.ttl_size +                           \
+        a.seqno_size +                         \
+        a.qos_id_size
+#define PCI_TAIL_SIZE(b) b.chk_size
+
+
+struct pci {
+        /* head */
+        uint8_t * dst_addr;
+        uint8_t * src_addr;
+        uint8_t * dst_cep_id;
+        uint8_t * src_cep_id;
+        uint8_t * pdu_length;
+        uint8_t * ttl;
+        uint8_t * seqno;
+        uint8_t * qos_id;
+
+        uint8_t * chk;
+
+        du_buff_t * dub;
+
+        struct ipcp_dtp_const dtpc;
+        struct ipcp_dup_const dupc;
+
+};
+
+pci_t * pci_create(du_buff_t                   * dub,
+                   const struct ipcp_dtp_const * dtpc,
+                   const struct ipcp_dup_const * dupc)
+{
+        struct pci * p;
+
+        if (dub == NULL) {
+                LOG_DBGF("Bogus input. Bugging out.");
+                return NULL;
+        }
+
+        p = malloc(sizeof *p);
+
+        if (p == NULL)
+                return NULL;
+
+        p->dub = dub;
+
+        p->dtpc = *dtpc;
+        p->dupc = *dupc;
+
+        p->dst_addr   = NULL;
+        p->src_addr   = NULL;
+        p->dst_cep_id = NULL;
+        p->src_cep_id = NULL;
+        p->pdu_length = NULL;
+        p->ttl        = NULL;
+        p->seqno      = NULL;
+        p->qos_id     = NULL;
+        p->chk        = NULL;
+
+        return p;
+}
+
+void pci_destroy(pci_t * pci)
+{
+        free(pci);
+}
+
+int pci_init(pci_t                 * pci)
+{
+        if (pci == NULL) {
+                LOG_DBGF("Bogus input. Bugging out.");
+                return -EINVAL;
+        }
+
+        uint8_t * pci_head = du_buff_head_alloc(pci->dub, PCI_HEAD_SIZE(
+                                                        pci->dtpc,pci->dupc));
+        uint8_t * pci_tail = du_buff_tail_alloc(pci->dub, PCI_TAIL_SIZE(
+                                                        pci->dupc));
+
+        if (pci_head == NULL) {
+                LOG_DBG("Failed to allocate space for PCI at head.");
+                return -ENOBUFS;
+        }
+
+        if (pci_tail == NULL) {
+                LOG_DBG("Failed to allocate space for PCI at tail.");
+                return -ENOBUFS;
+        }
+
+        pci->dst_addr   = pci_head;
+        pci->src_addr   = (pci_head += pci->dtpc.addr_size);
+        pci->dst_cep_id = (pci_head += pci->dtpc.addr_size);
+        pci->src_cep_id = (pci_head += pci->dtpc.cep_id_size);
+        pci->pdu_length = (pci_head += pci->dtpc.cep_id_size);
+        pci->ttl        = (pci_head += pci->dtpc.pdu_length_size);
+        pci->seqno      = (pci_head += pci->dupc.ttl_size);
+        pci->qos_id     = (pci_head += pci->dtpc.seqno_size);
+
+        pci->chk        = (pci_tail);
+
+        return 0;
+}
+
+void pci_release(pci_t * pci)
+{
+        if (pci == NULL)
+                return;
+
+        if (pci->dub == NULL)
+                return;
+
+        du_buff_head_release(pci->dub, PCI_HEAD_SIZE(pci->dtpc, pci->dupc));
+        du_buff_tail_release(pci->dub, PCI_TAIL_SIZE(pci->dupc));
+}