Export tcp_pcb_lists from tcp.c - can be used in SNMP code to implement MIB2 tcp connection tables

src/core/tcp.c

@@ -109,8 +109,6 @@ struct tcp_pcb *tcp_active_pcbs;
 /** List of all TCP PCBs in TIME-WAIT state */
 struct tcp_pcb *tcp_tw_pcbs;
 
-#define NUM_TCP_PCB_LISTS               4
-#define NUM_TCP_PCB_LISTS_NO_TIME_WAIT  3
 /** An array with all (non-temporary) PCB lists, mainly used for smaller code size */
 struct tcp_pcb ** const tcp_pcb_lists[] = {&tcp_listen_pcbs.pcbs, &tcp_bound_pcbs,
   &tcp_active_pcbs, &tcp_tw_pcbs};

src/include/lwip/priv/tcp_priv.h

@@ -360,6 +360,9 @@ extern struct tcp_pcb *tcp_active_pcbs;  /* List of all TCP PCBs that are in a
               data. */
 extern struct tcp_pcb *tcp_tw_pcbs;      /* List of all TCP PCBs in TIME-WAIT. */
 
+#define NUM_TCP_PCB_LISTS_NO_TIME_WAIT  3
+#define NUM_TCP_PCB_LISTS               4
+extern struct tcp_pcb ** const tcp_pcb_lists[NUM_TCP_PCB_LISTS];
 
 /* Axioms about the above lists:
    1) Every TCP PCB that is not CLOSED is in one of the lists.