corrected data link receive of large packets that were reporting a actual PDU length but not loading the PDU.

bacnet-stack/Makefile

@@ -6,8 +6,8 @@ BASEDIR = .
 #CFLAGS  = -Wall -I. -O2 -g
 # Note: you can strip out symbols using the strip command
 # to get an idea of how big the compile really is.
-#CFLAGS  = -Wall -I. -g -DBACDL_ETHERNET=1
-CFLAGS  = -Wall -I. -Iports/linux -g -DBACDL_BIP=1
+CFLAGS  = -Wall -I. -g -DBACDL_ETHERNET=1
+#CFLAGS  = -Wall -I. -Iports/linux -g -DBACDL_BIP=1
 
 SRCS = ports/linux/main.c \
        ports/linux/ethernet.c \

bacnet-stack/ports/linux/ethernet.c

@@ -357,6 +357,10 @@ uint16_t ethernet_receive(
     // copy the buffer into the PDU
     if (pdu_len < max_pdu)
       memmove(&pdu[0],&buf[17],pdu_len);
+    // ignore packets that are too large
+    else
+      pdu_len = 0;
+      
 
     return pdu_len;
 }

bacnet-stack/ports/linux/main.c

@@ -46,6 +46,7 @@
 // buffers used for receiving
 static uint8_t Rx_Buf[MAX_MPDU] = {0};
 
+#ifdef BACDL_BIP
 static int get_local_ifr_ioctl(char *ifname, struct ifreq *ifr, int request)
 {
     int fd;
@@ -106,12 +107,11 @@ static void Init_Network(char *ifname)
     /* setup local address */
     get_local_address_ioctl(ifname, &local_address, SIOCGIFADDR);
     decode_network_address(&local_address, &octet1, &octet2, &octet3, &octet4);
-    #ifdef BACDL_BIP
     bip_set_address(octet1, octet2, octet3, octet4);
-    #endif
     fprintf(stderr,"IP Address: %d.%d.%d.%d\n",
       (int)octet1, (int)octet2, (int)octet3, (int)octet4);   
 }
+#endif
 
 static void Init_Device_Parameters(void)
 {

bacnet-stack/ports/rtos32/bip.c

@@ -284,6 +284,8 @@ uint16_t bip_receive(
         pdu_len -= 4; /* BVLC header */
         if (pdu_len < max_pdu)
             memmove(&pdu[0],&buf[4],pdu_len);
+        // ignore packets that are too large
+        // clients should check my max-apdu first
         else
             pdu_len = 0;
     }

bacnet-stack/ports/rtos32/ethernet.c

@@ -257,6 +257,10 @@ uint16_t ethernet_receive(
     // copy the buffer into the PDU
     if (pdu_len < max_pdu)
       memmove(&pdu[0],&buf[17],pdu_len);
+    // ignore packets that are too large
+    // client should check my max apdu first
+    else
+      pdu_len = 0;
 
     return pdu_len;
 }