Make the kernel dump interval configurable.

babeld.c

@@ -91,6 +91,7 @@ static int kernel_routes_changed = 0;
 static int kernel_rules_changed = 0;
 static int kernel_link_changed = 0;
 static int kernel_addr_changed = 0;
+int kernel_check_interval = 300;
 
 struct timeval check_neighbours_timeout, check_interfaces_timeout;
 
@@ -603,7 +604,7 @@ main(int argc, char **argv)
     kernel_rules_changed = 0;
     kernel_link_changed = 0;
     kernel_addr_changed = 0;
-    kernel_dump_time = now.tv_sec + roughly(30);
+    kernel_dump_time = now.tv_sec + roughly(kernel_check_interval);
     schedule_neighbours_check(5000, 1);
     schedule_interfaces_check(30000, 1);
     expiry_time = now.tv_sec + roughly(30);
@@ -645,7 +646,8 @@ main(int argc, char **argv)
         timeval_min(&tv, &check_interfaces_timeout);
         timeval_min_sec(&tv, expiry_time);
         timeval_min_sec(&tv, source_expiry_time);
-        timeval_min_sec(&tv, kernel_dump_time);
+        if(kernel_check_interval > 0)
+            timeval_min_sec(&tv, kernel_dump_time);
         timeval_min(&tv, &resend_time);
         FOR_ALL_INTERFACES(ifp) {
             if(!if_up(ifp))
@@ -759,12 +761,12 @@ main(int argc, char **argv)
         }
 
         if(kernel_routes_changed || kernel_addr_changed ||
-           kernel_rules_changed || now.tv_sec >= kernel_dump_time) {
+           (kernel_check_interval > 0 && now.tv_sec >= kernel_dump_time)) {
             rc = check_xroutes(1);
             if(rc < 0)
                 fprintf(stderr, "Warning: couldn't check exported routes.\n");
             kernel_routes_changed = kernel_addr_changed = 0;
-            kernel_dump_time = now.tv_sec + roughly(300);
+            kernel_dump_time = now.tv_sec + roughly(kernel_check_interval);
         }
 
         if(timeval_compare(&check_neighbours_timeout, &now) < 0) {

babeld.h

@@ -106,6 +106,7 @@ extern int local_server_write;
 extern unsigned char protocol_group[16];
 extern int protocol_socket;
 extern int kernel_socket;
+extern int kernel_check_interval;
 extern int max_request_hopcount;
 
 extern uint32_t fee;

babeld.man

@@ -269,6 +269,11 @@ and can be specified multiple times with a cumulative effect.  This is
 equivalent to the command-line option
 .BR \-T .
 .TP
+.BI kernel-check-interval " seconds"
+This specifies the interval between two kernel routing table dumps.  The
+default is 300s (5 minutes).  This may be set to 0 in order to never
+perform periodic kernel dumps.
+.TP
 .BR link-detect " {" true | false }
 This specifies whether to use carrier sense for determining interface
 availability, and is equivalent to the command-line option

configuration.c

@@ -819,7 +819,8 @@ parse_option(int c, gnc_t gnc, void *closure, char *token)
        strcmp(token, "local-port") == 0 ||
        strcmp(token, "local-port-readwrite") == 0 ||
        strcmp(token, "export-table") == 0 ||
-       strcmp(token, "import-table") == 0) {
+       strcmp(token, "import-table") == 0 ||
+       strcmp(token, "kernel-check-interval") == 0) {
         int v;
         c = getint(c, &v, gnc, closure);
         if(c < -1 || v <= 0 || v >= 0xFFFF)
@@ -845,6 +846,8 @@ parse_option(int c, gnc_t gnc, void *closure, char *token)
             export_table = v;
         else if(strcmp(token, "import-table") == 0)
             add_import_table(v);
+        else if(strcmp(token, "kernel-check-interval") == 0)
+            kernel_check_interval = v;
         else
             abort();
     } else if(strcmp(token, "link-detect") == 0 ||