114 lines
2.9 KiB
C
114 lines
2.9 KiB
C
// L2TPNS Rate Limiting Stuff
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// $Id: rl.c,v 1.3 2004-04-05 05:29:13 fred_nerk Exp $
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#include <stdio.h>
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#include <sys/file.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <malloc.h>
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#include "l2tpns.h"
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extern radiust *radius;
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extern sessiont *session;
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extern u32 sessionid;
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extern int radfd;
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extern tbft *filter_buckets;
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extern struct configt *config;
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#define DEVICE "tun0"
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int next_tbf = 1;
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void init_rl()
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{
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char *commands[] = {
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"tc qdisc add dev " DEVICE " root handle 1: htb",
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"tc class add dev " DEVICE " parent 1: classid 1:1 htb rate 100mbit burst 300k",
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"tc filter del dev " DEVICE " protocol ip pref 1 fw",
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"iptables -t mangle -N throttle 2>&1 >/dev/null",
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"iptables -t mangle -F throttle 2>&1 >/dev/null",
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"iptables -t mangle -A l2tpns -j throttle 2>&1 >/dev/null",
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NULL
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};
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int i;
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log(2, 0, 0, 0, "Initializing HTB\n");
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for (i = 0; commands[i] && *commands[i]; i++)
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{
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log(3, 0, 0, 0, "Running \"%s\"\n", commands[i]);
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system(commands[i]);
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}
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log(2, 0, 0, 0, "Done initializing HTB\n");
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}
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u16 rl_create_tbf()
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{
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u16 t;
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char cmd[2048];
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if (!config->rl_rate) return 0;
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if (next_tbf >= MAXSESSION) return 0;
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t = next_tbf++;
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snprintf(filter_buckets[t].handle, 9, "1:%d0", t);
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log(2, 0, 0, 0, "Creating new htb %s\n", filter_buckets[t].handle);
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snprintf(cmd, 2048, "tc class add dev " DEVICE " parent 1: classid %s htb rate %lukbit burst 15k",
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filter_buckets[t].handle, config->rl_rate);
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log(3, 0, 0, 0, "%s\n", cmd);
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system(cmd);
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snprintf(cmd, 2048, "tc filter add dev " DEVICE " protocol ip parent 1:0 prio 1 handle %d fw flowid %s",
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t, filter_buckets[t].handle);
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log(3, 0, 0, 0, "%s\n", cmd);
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system(cmd);
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next_tbf++;
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return t;
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}
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u16 rl_get_tbf()
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{
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int i;
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if (!config->rl_rate) return 0;
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for (i = 1; i < MAXSESSION; i++)
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{
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if (!filter_buckets[i].in_use && *filter_buckets[i].handle)
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{
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filter_buckets[i].in_use = 1;
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log(2, 0, 0, 0, "Returning tbf %s\n", filter_buckets[i].handle);
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return i;
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}
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}
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i = rl_create_tbf();
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if (i) filter_buckets[i].in_use = 1;
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return i;
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}
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void rl_done_tbf(u16 t)
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{
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if (!t) return;
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if (!config->rl_rate) return;
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log(2, 0, 0, 0, "Freeing up HTB %s\n", filter_buckets[t].handle);
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filter_buckets[t].in_use = 0;
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}
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void rl_destroy_tbf(u16 t)
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{
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char cmd[2048];
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if (!config->rl_rate) return;
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if (filter_buckets[t].in_use)
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{
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log(0, 0, 0, 0, "Trying to destroy an in-use HTB %s\n", filter_buckets[t].handle);
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return;
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}
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snprintf(cmd, 2048, "tc qdisc del dev " DEVICE " handle %s", filter_buckets[t].handle);
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system(cmd);
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system("iptables -t mangle -D l2tpns -j throttle 2>&1 >/dev/null");
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system("iptables -t mangle -X throttle 2>&1 >/dev/null");
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memset(filter_buckets[t].handle, 0, sizeof(filter_buckets[t].handle));
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}
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