From 69ef99bb2dc05337e8189acc42dc9122f4182ead Mon Sep 17 00:00:00 2001
From: Sander Vrijders <sander.vrijders@intec.ugent.be>
Date: Sat, 8 Oct 2016 19:42:51 +0200
Subject: ipcpd: normal: First version of the fast path bootstrap

This is the first version of the fast path bootstrap in the normal
IPCP. It sets up a connection with the other end, and creates the
appropriate data structures. N+1 and N-1 SDUs are read and written and
passed through the right components.
---
 src/ipcpd/normal/rmt.c | 163 ++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 153 insertions(+), 10 deletions(-)

(limited to 'src/ipcpd/normal/rmt.c')

diff --git a/src/ipcpd/normal/rmt.c b/src/ipcpd/normal/rmt.c
index ee92c3e3..fa4c7edd 100644
--- a/src/ipcpd/normal/rmt.c
+++ b/src/ipcpd/normal/rmt.c
@@ -24,29 +24,172 @@
 
 #include <ouroboros/config.h>
 #include <ouroboros/logs.h>
+#include <ouroboros/select.h>
+#include <ouroboros/ipcp-dev.h>
+#include <ouroboros/errno.h>
+#include <ouroboros/dev.h>
+
+#include <stdlib.h>
 
 #include "rmt.h"
+#include "config.h"
+#include "frct.h"
+
+struct {
+        pthread_t         sdu_reader;
+        struct flow_set * set;
+        uint32_t          address;
 
-struct rmt {
-};
+        /*
+         * FIXME: Normally the PFF is held here,
+         * for now we keep 1 fd to forward a PDU on
+         */
+        int fd;
+} rmt;
 
-int rmt_init(struct dt_const * dtc)
+int rmt_init(uint32_t address)
 {
-        LOG_MISSING;
+        rmt.set = flow_set_create();
+        if (rmt.set == NULL)
+                return -1;
 
-        return -1;
+        rmt.address = address;
+
+        return 0;
 }
 
 int rmt_fini()
 {
-        LOG_MISSING;
+        flow_set_destroy(rmt.set);
+
+        return 0;
+}
+
+void * rmt_sdu_reader(void * o)
+{
+        struct timespec timeout = {0, FD_UPDATE_TIMEOUT};
+        struct shm_du_buff * sdb;
+        struct pci * pci;
+
+        while (true) {
+                int fd = flow_select(rmt.set, &timeout);
+                if (fd == -ETIMEDOUT)
+                        continue;
+
+                if (fd < 0) {
+                        LOG_ERR("Failed to get active fd.");
+                        continue;
+                }
+
+                if (ipcp_flow_read(fd, &sdb)) {
+                        LOG_ERR("Failed to read SDU from fd %d.", fd);
+                        continue;
+                }
+
+                pci = shm_pci_des(sdb);
+                if (pci == NULL) {
+                        LOG_ERR("Failed to get PCI.");
+                        ipcp_flow_del(sdb);
+                        continue;
+                }
+
+                if (pci->dst_addr != rmt.address) {
+                        LOG_DBG("PDU needs to be forwarded.");
+
+                        if (pci->ttl == 0) {
+                                LOG_DBG("TTL was zero.");
+                                ipcp_flow_del(sdb);
+                                free(pci);
+                                continue;
+                        }
+
+                        if (shm_pci_dec_ttl(sdb)) {
+                                LOG_ERR("Failed to decrease TTL.");
+                                ipcp_flow_del(sdb);
+                                free(pci);
+                                continue;
+                        }
+                        /*
+                         * FIXME: Dropping for now, since
+                         * we don't have a PFF yet
+                         */
+                        ipcp_flow_del(sdb);
+                        free(pci);
+                        continue;
+                }
+
+                if (shm_pci_shrink(sdb)) {
+                        LOG_ERR("Failed to shrink PDU.");
+                        ipcp_flow_del(sdb);
+                        free(pci);
+                        continue;
+                }
+
+                if (frct_rmt_post_sdu(pci, sdb)) {
+                        LOG_ERR("Failed to hand PDU to FRCT.");
+                        ipcp_flow_del(sdb);
+                        free(pci);
+                        continue;
+                }
+        }
+
+        return (void *) 0;
+}
+
+int rmt_dt_flow(int           fd,
+                enum qos_cube qos)
+{
+        struct flow_set * set = rmt.set;
+        if (set == NULL)
+                return -1;
+
+        flow_set_add(set, fd);
 
-        return -1;
+        /* FIXME: This will be removed once we have a PFF */
+        rmt.fd = fd;
+
+        return 0;
 }
 
-int rmt_frct_post()
+int rmt_frct_write_sdu(struct pci *         pci,
+                       struct shm_du_buff * sdb)
 {
-        LOG_MISSING;
+        if (shm_pci_ser(sdb, pci)) {
+                LOG_ERR("Failed to serialize PDU.");
+                ipcp_flow_del(sdb);
+                return -1;
+        }
+
+        if (ipcp_flow_write(rmt.fd, sdb)) {
+                LOG_ERR("Failed to write SDU to fd %d.", rmt.fd);
+                ipcp_flow_del(sdb);
+                return -1;
+        }
+
+        return 0;
+}
+
+int rmt_frct_write_buf(struct pci * pci,
+                       buffer_t *   buf)
+{
+        buffer_t * buffer;
+
+        if (pci == NULL || buf == NULL || buf->data == NULL)
+                return -1;
+
+        buffer = shm_pci_ser_buf(buf, pci);
+        if (buffer == NULL) {
+                LOG_ERR("Failed to serialize buffer.");
+                free(buf->data);
+                return -1;
+        }
+
+        if (flow_write(rmt.fd, buffer->data, buffer->len) == -1) {
+                LOG_ERR("Failed to write buffer to fd.");
+                free(buffer);
+                return -1;
+        }
 
-        return -1;
+        free(buffer);
+        return 0;
 }
-- 
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