PDP: Introduce flag to limit MTU

Setting flag RIL_MAX_MTU will limit MTU to specified value,
the unit is bytes and the default value is 1500.

Signed-off-by: Sverre Vegge <sverre.vegge@stericsson.com>

2 files changed, 12 insertions, 3 deletions

diff --git a/Android.mk b/Android.mk
index d32fd79..043b58b 100755
--- a/Android.mk
+++ b/Android.mk
@@ -85,6 +85,12 @@ ifneq ($(USE_EARLY_NITZ_TIME_SUBSCRIPTION),)
 LOCAL_CFLAGS += -DUSE_EARLY_NITZ_TIME_SUBSCRIPTION
 endif
 
+ifneq ($(RIL_MAX_MTU),)
+LOCAL_CFLAGS += -DRIL_MAX_MTU=$(RIL_MAX_MTU)
+else
+LOCAL_CFLAGS += -DRIL_MAX_MTU=1500
+endif
+
 ifneq ($(USE_LEGACY_SAT_AT_CMDS),)
 LOCAL_CFLAGS += -DUSE_LEGACY_SAT_AT_CMDS
 endif
diff --git a/u300-ril-pdp.c b/u300-ril-pdp.c
index cd73d8a..a0b03ad 100644
--- a/u300-ril-pdp.c
+++ b/u300-ril-pdp.c
@@ -1106,8 +1106,11 @@ void requestSetupDataCall(void *data, size_t datalen, RIL_Token t)
         int mtu = 0;
 
         mtu = atoi(mtuStr);
-        if (mtu > 1500)
-            mtu = 1500;
+        /* Default value of RIL_MAX_MTU is 1500, see Android.mk for details */
+        if (mtu > RIL_MAX_MTU) {
+            mtu = RIL_MAX_MTU;
+            LOGI("%s(): MTU is overridden and limited to %d!", __func__, mtu);
+        }
 
         if (mtu > 1) {
             struct ifreq ifr;
@@ -1124,7 +1127,7 @@ void requestSetupDataCall(void *data, size_t datalen, RIL_Token t)
             }
 
             if (ioctl(ifc_ctl_sock, SIOCSIFMTU, &ifr)) {
-                LOGE("%s() failed to set MTU to %s!", __func__, mtuStr);
+                LOGE("%s() failed to set MTU to %d!", __func__, mtu);
                 goto error__deactivate_pdp;
             }