Check return code when throttling users

[l2tpns.git] / rl.c

diff --git a/rl.c b/rl.c
index 6abb78c..1692944 100644 (file)
--- a/rl.c
+++ b/rl.c
@@ -1,32 +1,32 @@
 // L2TPNS Rate Limiting Stuff
-// $Id: rl.c,v 1.3 2004/04/05 05:29:13 fred_nerk Exp $
+// $Id: rl.c,v 1.4 2004/05/24 04:28:41 fred_nerk Exp $
 
+#include <arpa/inet.h>
+#include <errno.h>
+#include <malloc.h>
 #include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
 #include <sys/file.h>
 #include <sys/stat.h>
-#include <errno.h>
-#include <string.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <time.h>
 #include <unistd.h>
-#include <stdlib.h>
-#include <malloc.h>
 #include "l2tpns.h"
 
 extern radiust *radius;
 extern sessiont *session;
 extern u32 sessionid;
-extern int radfd;
 extern tbft *filter_buckets;
 extern struct configt *config;
 
 #define DEVICE "tun0"
 
-int next_tbf = 1;
-
 void init_rl()
 {
     char *commands[] = {
        "tc qdisc add dev " DEVICE " root handle 1: htb",
-       "tc class add dev " DEVICE " parent 1: classid 1:1 htb rate 100mbit burst 300k",
        "tc filter del dev " DEVICE " protocol ip pref 1 fw",
        "iptables -t mangle -N throttle 2>&1 >/dev/null",
        "iptables -t mangle -F throttle 2>&1 >/dev/null",
@@ -50,22 +50,31 @@ u16 rl_create_tbf()
     char cmd[2048];
     if (!config->rl_rate) return 0;
 
-    if (next_tbf >= MAXSESSION) return 0;
-    t = next_tbf++;
+    t = ++config->next_tbf;
+    if (config->next_tbf >= MAXSESSION) return 0;
     snprintf(filter_buckets[t].handle, 9, "1:%d0", t);
 
     log(2, 0, 0, 0, "Creating new htb %s\n", filter_buckets[t].handle);
     snprintf(cmd, 2048, "tc class add dev " DEVICE " parent 1: classid %s htb rate %lukbit burst 15k",
            filter_buckets[t].handle, config->rl_rate);
     log(3, 0, 0, 0, "%s\n", cmd);
-    system(cmd);
+    if (WEXITSTATUS(system(cmd)) != 0)
+    {
+       memset(filter_buckets[t].handle, 0, sizeof(filter_buckets[t].handle));
+       log(0, 0, 0, 0, "tc returned an error creating a token bucket\n");
+       return 0;
+    }
 
     snprintf(cmd, 2048, "tc filter add dev " DEVICE " protocol ip parent 1:0 prio 1 handle %d fw flowid %s",
            t, filter_buckets[t].handle);
     log(3, 0, 0, 0, "%s\n", cmd);
-    system(cmd);
+    if (WEXITSTATUS(system(cmd)) != 0)
+    {
+       memset(filter_buckets[t].handle, 0, sizeof(filter_buckets[t].handle));
+       log(0, 0, 0, 0, "tc returned an error creating a filter\n");
+       return 0;
+    }
 
-    next_tbf++;
     return t;
 }
 
@@ -76,12 +85,12 @@ u16 rl_get_tbf()
 
     for (i = 1; i < MAXSESSION; i++)
     {
-       if (!filter_buckets[i].in_use && *filter_buckets[i].handle)
-       {
-           filter_buckets[i].in_use = 1;
-           log(2, 0, 0, 0, "Returning tbf %s\n", filter_buckets[i].handle);
-           return i;
-       }
+       if (!*filter_buckets[i].handle) continue;
+       if (filter_buckets[i].in_use) continue;
+
+       filter_buckets[i].in_use = 1;
+       log(2, 0, 0, 0, "Returning tbf %s\n", filter_buckets[i].handle);
+       return i;
     }
     i = rl_create_tbf();
     if (i) filter_buckets[i].in_use = 1;
@@ -91,7 +100,6 @@ u16 rl_get_tbf()
 void rl_done_tbf(u16 t)
 {
     if (!t) return;
-    if (!config->rl_rate) return;
     log(2, 0, 0, 0, "Freeing up HTB %s\n", filter_buckets[t].handle);
     filter_buckets[t].in_use = 0;
 }
@@ -106,9 +114,8 @@ void rl_destroy_tbf(u16 t)
        return;
     }
     snprintf(cmd, 2048, "tc qdisc del dev " DEVICE " handle %s", filter_buckets[t].handle);
-    system(cmd);
-    system("iptables -t mangle -D l2tpns -j throttle 2>&1 >/dev/null");
-    system("iptables -t mangle -X throttle 2>&1 >/dev/null");
+    if (WEXITSTATUS(system(cmd)) != 0)
+       log(0, 0, 0, 0, "tc returned an error deleting a token bucket\n");
     memset(filter_buckets[t].handle, 0, sizeof(filter_buckets[t].handle));
 }