ipdpd: Pass MPL to application at flow_allocation

The maximum packet lifetime (MPL) is a property of the flow that needs
to be passed to the reliable transmission protocol (FRCP) for its
correct operation. Previously, the value of MPL was set fixed as one
of the (fixed) Delta-t parameters. This patch makes the MPL a property
of the layer, and it can now be set per layer-type at build time.
This is a step towards a proper MPL estimator in the flow allocator.

Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks>
Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>

2 files changed, 4 insertions, 1 deletions

diff --git a/src/ipcpd/broadcast/CMakeLists.txt b/src/ipcpd/broadcast/CMakeLists.txt
index afcc8696..af0d8fcf 100644
--- a/src/ipcpd/broadcast/CMakeLists.txt
+++ b/src/ipcpd/broadcast/CMakeLists.txt
@@ -13,6 +13,8 @@ include_directories(${CMAKE_SOURCE_DIR}/include)
 include_directories(${CMAKE_BINARY_DIR}/include)
 
 set(IPCP_BROADCAST_TARGET ipcpd-broadcast CACHE INTERNAL "")
+set(IPCP_BROADCAST_MPL 60 CACHE STRING
+    "Default maximum packet lifetime for the broadcast IPCP, in seconds")
 
 set(SOURCE_FILES
   # Add source files here
diff --git a/src/ipcpd/broadcast/main.c b/src/ipcpd/broadcast/main.c
index 522d1391..03c1e746 100644
--- a/src/ipcpd/broadcast/main.c
+++ b/src/ipcpd/broadcast/main.c
@@ -224,6 +224,7 @@ static int broadcast_ipcp_join(int             fd,
                                qosspec_t       qs)
 {
         struct conn conn;
+        time_t      mpl = IPCP_BROADCAST_MPL;
 
         (void) qs;
 
@@ -236,7 +237,7 @@ static int broadcast_ipcp_join(int             fd,
 
         notifier_event(NOTIFY_DT_CONN_ADD, &conn);
 
-        ipcp_flow_alloc_reply(fd, 0, NULL, 0);
+        ipcp_flow_alloc_reply(fd, 0, mpl, NULL, 0);
 
         return 0;
 }