ipcpd: initial IPC processes

Basic functions for implementation of IPC processes, and
implementation of core functions of the shim IPCP over UDP.  Updates
to the build system to compile these IPC processes, as well as some
fixes in the irmd (rudimentary capturing exit signals) and some fixes
in the library, mainly relating to the messaging.

Basic implementation of creation / bootstrapping / deletion of the
shim UDP. Placeholders for other functions.

1 files changed, 146 insertions, 0 deletions

diff --git a/src/ipcpd/normal/pci.c b/src/ipcpd/normal/pci.c
new file mode 100644
index 00000000..d7df52b6
--- /dev/null
+++ b/src/ipcpd/normal/pci.c
@@ -0,0 +1,146 @@
+/*
+ * 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 <stdlib.h>
+#include <errno.h>
+
+#define OUROBOROS_PREFIX "ipcp/pci"
+
+#include <ouroboros/logs.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));
+}