Use named constants for kernel route manipulation.

kernel.c

@@ -545,7 +545,7 @@ kernel_interface_wireless(const char *ifname, int ifindex)
 }
 
 int
-kernel_route(int add, const unsigned char *dest, unsigned short plen,
+kernel_route(int operation, const unsigned char *dest, unsigned short plen,
              const unsigned char *gate, int ifindex, unsigned int metric)
 {
 
@@ -554,8 +554,8 @@ kernel_route(int add, const unsigned char *dest, unsigned short plen,
     struct rtattr *rta;
     int len = sizeof(buf.raw);
 
-    debugf("kernel_route: %s: %s/%d metric %d via %d nexthop %s\n",
-           add ? "Add" : "Del",
+    debugf("kernel_route: %s %s/%d metric %d via %d nexthop %s\n",
+           operation == ROUTE_ADD ? "add" : "flush",
            format_address(dest), plen, metric, ifindex,
            format_address(gate));
 
@@ -566,7 +566,7 @@ kernel_route(int add, const unsigned char *dest, unsigned short plen,
     }
 
     memset(buf.raw, 0, sizeof(buf.raw));
-    if(add) {
+    if(operation == ROUTE_ADD) {
         buf.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL;
         buf.nh.nlmsg_type = RTM_NEWROUTE;
     } else {

kernel.h

@@ -30,11 +30,14 @@ struct kernel_route {
     unsigned char gw[16];
 };
 
+#define ROUTE_FLUSH 0
+#define ROUTE_ADD 1
+
 int kernel_setup(int setup);
 int kernel_setup_interface(int setup, const char *ifname, int ifindex);
 int kernel_interface_mtu(const char *ifname, int ifindex);
 int kernel_interface_wireless(const char *ifname, int ifindex);
-int kernel_route(int add, const unsigned char *dest, unsigned short plen,
+int kernel_route(int operation, const unsigned char *dest, unsigned short plen,
                  const unsigned char *gate, int ifindex, unsigned int metric);
 int kernel_routes(int maxplen, struct kernel_route *routes, int maxroutes);
 int kernel_callback(void);

route.c

@@ -177,12 +177,12 @@ install_route(struct route *route)
     if(installed)
         uninstall_route(installed);
 
-    rc = kernel_route(1, route->dest->address, 128,
+    rc = kernel_route(ROUTE_ADD, route->dest->address, 128,
                       route->nexthop->address,
                       route->nexthop->network->ifindex,
                       metric_to_kernel(route->metric));
     if(rc < 0) {
-        perror("kernel_route(1)");
+        perror("kernel_route(ADD)");
         if(errno != EEXIST)
             return;
     }
@@ -209,12 +209,12 @@ uninstall_route(struct route *route)
             uninstall_xroute(&xroutes[i]);
     }
 
-    rc = kernel_route(0, route->dest->address, 128,
+    rc = kernel_route(ROUTE_FLUSH, route->dest->address, 128,
                       route->nexthop->address,
                       route->nexthop->network->ifindex,
                       metric_to_kernel(route->metric));
     if(rc < 0)
-        perror("kernel_route(0)");
+        perror("kernel_route(FLUSH)");
     route->installed = 0;
 }
 

xroute.c

@@ -116,12 +116,12 @@ install_xroute(struct xroute *xroute)
     if(installed)
         uninstall_xroute(installed);
 
-    rc = kernel_route(1, xroute->prefix, xroute->plen,
+    rc = kernel_route(ROUTE_ADD, xroute->prefix, xroute->plen,
                       gwroute->nexthop->address,
                       gwroute->nexthop->network->ifindex,
                       metric_to_kernel(xroute->metric));
     if(rc < 0) {
-        perror("kernel_route(1)");
+        perror("kernel_route(ADD)");
         if(errno != EEXIST)
             return;
     }
@@ -145,12 +145,12 @@ uninstall_xroute(struct xroute *xroute)
         return;
     }
 
-    rc = kernel_route(0, xroute->prefix, xroute->plen,
+    rc = kernel_route(ROUTE_FLUSH, xroute->prefix, xroute->plen,
                       gwroute->nexthop->address,
                       gwroute->nexthop->network->ifindex,
                       metric_to_kernel(xroute->metric));
     if(rc < 0)
-        perror("kernel_route(0)");
+        perror("kernel_route(FLUSH)");
     xroute->installed = 0;
 }