From: Bart Polot <bart@net.in.tum.de>
Date: Thu, 27 Oct 2016 06:18:17 +0000 (+0000)
Subject: Build messages fully in tunnel code, avoid copying in connection layer
X-Git-Tag: initial-import-from-subversion-38251~26
X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=6a0ded9c43e7e8407e8944f3e62a9d3d08726062;p=oweals%2Fgnunet.git

Build messages fully in tunnel code, avoid copying in connection layer
---

diff --git a/src/cadet/gnunet-service-cadet_connection.c b/src/cadet/gnunet-service-cadet_connection.c
index eb13cb637..4a4de2200 100644
--- a/src/cadet/gnunet-service-cadet_connection.c
+++ b/src/cadet/gnunet-service-cadet_connection.c
@@ -3268,37 +3268,6 @@ GCC_send_prebuilt_message (const struct GNUNET_MessageHeader *message,
   size = ntohs (message->size);
   type = ntohs (message->type);
 
-  /* Allocate a copy of the message on the stack, so we can modify it as needed,
-   * adding the Connection ID, PID, and other data the Tunnel layer doesn't
-   * have access to.
-   */
-  char cbuf[size];
-  struct GNUNET_MessageHeader *copy = (struct GNUNET_MessageHeader *)cbuf;
-
-  if (GNUNET_MESSAGE_TYPE_CADET_AX == type
-      || GNUNET_MESSAGE_TYPE_CADET_KX == type)
-  {
-    GNUNET_memcpy (copy, message, size);
-    if (GNUNET_MESSAGE_TYPE_CADET_AX == type)
-    {
-      struct GNUNET_CADET_AX        *axmsg;
-
-      axmsg = (struct GNUNET_CADET_AX *) copy;
-      axmsg->cid = c->id;
-      axmsg->pid = htonl (GCC_get_pid (c, fwd));
-    }
-    else /* case GNUNET_MESSAGE_TYPE_CADET_KX */
-    {
-      struct GNUNET_CADET_KX        *kmsg;
-
-      GNUNET_assert (GNUNET_MESSAGE_TYPE_CADET_KX == type);
-      kmsg = (struct GNUNET_CADET_KX *) copy;
-      kmsg->reserved = htonl (0);
-      kmsg->cid = c->id;
-    }
-    message = copy;
-  }
-
   GCC_check_connections ();
   fc = fwd ? &c->fwd_fc : &c->bck_fc;
   if (0 == fc->queue_max)
@@ -3307,8 +3276,6 @@ GCC_send_prebuilt_message (const struct GNUNET_MessageHeader *message,
     return NULL;
   }
 
-  size = ntohs (message->size);
-  type = ntohs (message->type);
   LOG (GNUNET_ERROR_TYPE_INFO,
        "--> %s (%s %4u) on conn %s (%p) %s [%5u]\n",
        GC_m2s (type), GC_m2s (payload_type), payload_id, GCC_2s (c), c,
diff --git a/src/cadet/gnunet-service-cadet_tunnel.c b/src/cadet/gnunet-service-cadet_tunnel.c
index 267070552..26c1ea3d4 100644
--- a/src/cadet/gnunet-service-cadet_tunnel.c
+++ b/src/cadet/gnunet-service-cadet_tunnel.c
@@ -1406,6 +1406,9 @@ send_prebuilt_message (const struct GNUNET_MessageHeader *message,
     }
     return NULL; /* Drop... */
   }
+  fwd = GCC_is_origin (c, GNUNET_YES);
+  ax_msg->cid = *GCC_get_id (c);
+  ax_msg->pid = htonl (GCC_get_pid (c, fwd));
 
   mid = 0;
   type = ntohs (message->type);
@@ -1430,8 +1433,6 @@ send_prebuilt_message (const struct GNUNET_MessageHeader *message,
   }
   LOG (GNUNET_ERROR_TYPE_DEBUG, "type %s\n", GC_m2s (type));
 
-  fwd = GCC_is_origin (c, GNUNET_YES);
-
   if (NULL == cont)
   {
     GNUNET_break (NULL == GCC_send_prebuilt_message (msg, type, mid, c, fwd,
@@ -1612,6 +1613,7 @@ send_kx (struct CadetTunnel *t,
   msg = (struct GNUNET_CADET_KX *) cbuf;
   msg->header.type = htons (GNUNET_MESSAGE_TYPE_CADET_KX);
   msg->header.size = htons (sizeof (struct GNUNET_CADET_KX) + size);
+  msg->reserved = htonl (0);
   c = tunnel_get_connection (t);
   if (NULL == c)
   {
@@ -1622,6 +1624,7 @@ send_kx (struct CadetTunnel *t,
     }
     return NULL;
   }
+  msg->cid = *GCC_get_id (c);
   switch (type)
   {
     case GNUNET_MESSAGE_TYPE_CADET_AX_KX: