From 6b0ceb8aec7dc2d607523d7aadc2fec237ce2ca8 Mon Sep 17 00:00:00 2001
From: Justus Winter <4winter@informatik.uni-hamburg.de>
Date: Fri, 22 Nov 2013 16:03:52 +0100
Subject: ipc: provide the protected payload in ipc_kmsg_copyout_header

* ipc/ipc_kmsg.c (ipc_kmsg_copyout_header): If a protected payload is
set for the destination port, provide it in msgh_protected_payload.
* ipc/mach_msg.c (mach_msg_trap): Likewise in the fast paths.
* doc/mach.texi (Message Receive): Document message semantics with
protected payloads.
---
 ipc/ipc_kmsg.c | 58 +++++++++++++++++++++++++++++++++++++++++++++-------------
 1 file changed, 45 insertions(+), 13 deletions(-)

(limited to 'ipc/ipc_kmsg.c')

diff --git a/ipc/ipc_kmsg.c b/ipc/ipc_kmsg.c
index 06cec72..71a0d74 100644
--- a/ipc/ipc_kmsg.c
+++ b/ipc/ipc_kmsg.c
@@ -1799,9 +1799,17 @@ ipc_kmsg_copyout_header(
 		} else
 			ip_unlock(dest);
 
-		msg->msgh_bits = (MACH_MSGH_BITS_OTHER(mbits) |
-				  MACH_MSGH_BITS(0, MACH_MSG_TYPE_PORT_SEND));
-		msg->msgh_local_port = dest_name;
+		if (! ipc_port_flag_protected_payload(dest)) {
+			msg->msgh_bits = (MACH_MSGH_BITS_OTHER(mbits) |
+				MACH_MSGH_BITS(0, MACH_MSG_TYPE_PORT_SEND));
+			msg->msgh_local_port = dest_name;
+		} else {
+			msg->msgh_bits = (MACH_MSGH_BITS_OTHER(mbits) |
+				MACH_MSGH_BITS(
+					0, MACH_MSG_TYPE_PROTECTED_PAYLOAD));
+			msg->msgh_protected_payload =
+				dest->ip_protected_payload;
+		}
 		msg->msgh_remote_port = MACH_PORT_NULL;
 		return MACH_MSG_SUCCESS;
 	    }
@@ -1897,10 +1905,18 @@ ipc_kmsg_copyout_header(
 		} else
 			ip_unlock(dest);
 
-		msg->msgh_bits = (MACH_MSGH_BITS_OTHER(mbits) |
-				  MACH_MSGH_BITS(MACH_MSG_TYPE_PORT_SEND_ONCE,
-						 MACH_MSG_TYPE_PORT_SEND));
-		msg->msgh_local_port = dest_name;
+		if (! ipc_port_flag_protected_payload(dest)) {
+			msg->msgh_bits = (MACH_MSGH_BITS_OTHER(mbits) |
+				MACH_MSGH_BITS(MACH_MSG_TYPE_PORT_SEND_ONCE,
+					       MACH_MSG_TYPE_PORT_SEND));
+			msg->msgh_local_port = dest_name;
+		} else {
+			msg->msgh_bits = (MACH_MSGH_BITS_OTHER(mbits) |
+				MACH_MSGH_BITS(MACH_MSG_TYPE_PORT_SEND_ONCE,
+					MACH_MSG_TYPE_PROTECTED_PAYLOAD));
+			msg->msgh_protected_payload =
+				dest->ip_protected_payload;
+		}
 		msg->msgh_remote_port = reply_name;
 		return MACH_MSG_SUCCESS;
 	    }
@@ -1932,9 +1948,18 @@ ipc_kmsg_copyout_header(
 			dest_name = MACH_PORT_NULL;
 		}
 
-		msg->msgh_bits = (MACH_MSGH_BITS_OTHER(mbits) |
-			MACH_MSGH_BITS(0, MACH_MSG_TYPE_PORT_SEND_ONCE));
-		msg->msgh_local_port = dest_name;
+		if (! ipc_port_flag_protected_payload(dest)) {
+			msg->msgh_bits = (MACH_MSGH_BITS_OTHER(mbits) |
+				MACH_MSGH_BITS(0,
+					MACH_MSG_TYPE_PORT_SEND_ONCE));
+			msg->msgh_local_port = dest_name;
+		} else {
+			msg->msgh_bits = (MACH_MSGH_BITS_OTHER(mbits) |
+				MACH_MSGH_BITS(0,
+					MACH_MSG_TYPE_PROTECTED_PAYLOAD));
+			msg->msgh_protected_payload =
+				dest->ip_protected_payload;
+		}
 		msg->msgh_remote_port = MACH_PORT_NULL;
 		return MACH_MSG_SUCCESS;
 	    }
@@ -2224,9 +2249,16 @@ ipc_kmsg_copyout_header(
 	if (IP_VALID(reply))
 		ipc_port_release(reply);
 
-	msg->msgh_bits = (MACH_MSGH_BITS_OTHER(mbits) |
-			  MACH_MSGH_BITS(reply_type, dest_type));
-	msg->msgh_local_port = dest_name;
+	if (! ipc_port_flag_protected_payload(dest)) {
+		msg->msgh_bits = (MACH_MSGH_BITS_OTHER(mbits) |
+				  MACH_MSGH_BITS(reply_type, dest_type));
+		msg->msgh_local_port = dest_name;
+	} else {
+		msg->msgh_bits = (MACH_MSGH_BITS_OTHER(mbits) |
+				  MACH_MSGH_BITS(reply_type,
+					MACH_MSG_TYPE_PROTECTED_PAYLOAD));
+		msg->msgh_protected_payload = dest->ip_protected_payload;
+	}
 	msg->msgh_remote_port = reply_name;
     }
 
-- 
cgit v1.2.3