1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
|
#!/bin/bash
# Written by Marco Bonetti & Mike Perry
# Based on instructions from Dan Singletary's ADSL BW Management HOWTO:
# http://www.faqs.org/docs/Linux-HOWTO/ADSL-Bandwidth-Management-HOWTO.html
# This script is Public Domain.
############################### README #################################
# This script provides prioritization of Tor traffic below other
# traffic on a Linux server. It has two modes of operation: UID based
# and IP based.
# UID BASED PRIORITIZATION
#
# The UID based method requires that Tor be launched from
# a specific user ID. The "User" Tor config setting is
# insufficient, as it sets the UID after the socket is created.
# Here is a C wrapper you can use to execute Tor and drop privs before
# it creates any sockets.
#
# Compile with:
# gcc -DUID=`id -u tor` -DGID=`id -g tor` tor_wrap.c -o tor_wrap
#
# #include <unistd.h>
# int main(int argc, char **argv) {
# if(initgroups("tor", GID) == -1) { perror("initgroups"); return 1; }
# if(setresgid(GID, GID, GID) == -1) { perror("setresgid"); return 1; }
# if(setresuid(UID, UID, UID) == -1) { perror("setresuid"); return 1; }
# execl("/bin/tor", "/bin/tor", "-f", "/etc/tor/torrc", NULL);
# perror("execl"); return 1;
# }
# IP BASED PRIORITIZATION
#
# The IP setting requires that a separate IP address be dedicated to Tor.
# Your Torrc should be set to bind to this IP for "OutboundBindAddress",
# "ListenAddress", and "Address".
# GENERAL USAGE
#
# You should also tune the individual connection rate parameters below
# to your individual connection. In particular, you should leave *some*
# minimum amount of bandwidth for Tor, so that Tor users are not
# completely choked out when you use your server's bandwidth. 30% is
# probably a reasonable choice. More is better of course.
#
# To start the shaping, run it as:
# ./linux-tor-prio.sh
#
# To get status information (useful to verify packets are getting marked
# and prioritized), run:
# ./linux-tor-prio.sh status
#
# And to stop prioritization:
# ./linux-tor-prio.sh stop
#
########################################################################
# BEGIN USER TUNABLE PARAMETERS
DEV=eth0
# NOTE! You must START Tor under this UID. Using the Tor User
# config setting is NOT sufficient. See above.
TOR_UID=$(id -u tor)
# If the UID mechanism doesn't work for you, you can set this parameter
# instead. If set, it will take precedence over the UID setting. Note that
# you need multiple IPs with one specifically devoted to Tor for this to
# work.
#TOR_IP="42.42.42.42"
# Average ping to most places on the net, milliseconds
RTT_LATENCY=40
# RATE_UP must be less than your connection's upload capacity in
# kbits/sec. If it is larger, then the bottleneck will be at your
# router's queue, which you do not control. This will cause congestion
# and a revert to normal TCP fairness no matter what the queing
# priority is.
RATE_UP=5000
# RATE_UP_TOR is the minimum speed your Tor connections will have in
# kbits/sec. They will have at least this much bandwidth for upload.
# In general, you probably shouldn't set this too low, or else Tor
# users who use your node will be completely choked out whenever your
# machine does any other network activity. That is not very fun.
RATE_UP_TOR=1500
# RATE_UP_TOR_CEIL is the maximum rate allowed for all Tor trafic in
# kbits/sec.
RATE_UP_TOR_CEIL=5000
CHAIN=OUTPUT
#CHAIN=PREROUTING
#CHAIN=POSTROUTING
MTU=1500
AVG_PKT=900 # should be more like 600 for non-exit nodes
# END USER TUNABLE PARAMETERS
# The queue size should be no larger than your bandwidth-delay
# product. This is RT latency*bandwidth/MTU/2
BDP=$(expr $RTT_LATENCY \* $RATE_UP / $AVG_PKT)
# Further research indicates that the BDP calculations should use
# RTT/sqrt(n) where n is the expected number of active connections..
BDP=$(expr $BDP / 4)
if [ "$1" = "status" ]
then
echo "[qdisc]"
tc -s qdisc show dev $DEV
tc -s qdisc show dev imq0
echo "[class]"
tc -s class show dev $DEV
tc -s class show dev imq0
echo "[filter]"
tc -s filter show dev $DEV
tc -s filter show dev imq0
echo "[iptables]"
iptables -t mangle -L TORSHAPER-OUT -v -x 2> /dev/null
exit
fi
# Reset everything to a known state (cleared)
tc qdisc del dev $DEV root 2> /dev/null > /dev/null
tc qdisc del dev imq0 root 2> /dev/null > /dev/null
iptables -t mangle -D POSTROUTING -o $DEV -j TORSHAPER-OUT 2> /dev/null > /dev/null
iptables -t mangle -D PREROUTING -o $DEV -j TORSHAPER-OUT 2> /dev/null > /dev/null
iptables -t mangle -D OUTPUT -o $DEV -j TORSHAPER-OUT 2> /dev/null > /dev/null
iptables -t mangle -F TORSHAPER-OUT 2> /dev/null > /dev/null
iptables -t mangle -X TORSHAPER-OUT 2> /dev/null > /dev/null
ip link set imq0 down 2> /dev/null > /dev/null
rmmod imq 2> /dev/null > /dev/null
if [ "$1" = "stop" ]
then
echo "Shaping removed on $DEV."
exit
fi
# Outbound Shaping (limits total bandwidth to RATE_UP)
ip link set dev $DEV qlen $BDP
# Add HTB root qdisc, default is high prio
tc qdisc add dev $DEV root handle 1: htb default 20
# Add main rate limit class
tc class add dev $DEV parent 1: classid 1:1 htb rate ${RATE_UP}kbit
# Create the two classes, giving Tor at least RATE_UP_TOR kbit and capping
# total upstream at RATE_UP so the queue is under our control.
tc class add dev $DEV parent 1:1 classid 1:20 htb rate $(expr $RATE_UP - $RATE_UP_TOR)kbit ceil ${RATE_UP}kbit prio 0
tc class add dev $DEV parent 1:1 classid 1:21 htb rate $[$RATE_UP_TOR]kbit ceil ${RATE_UP_TOR_CEIL}kbit prio 10
# Start up pfifo
tc qdisc add dev $DEV parent 1:20 handle 20: pfifo limit $BDP
tc qdisc add dev $DEV parent 1:21 handle 21: pfifo limit $BDP
# filter traffic into classes by fwmark
tc filter add dev $DEV parent 1:0 prio 0 protocol ip handle 20 fw flowid 1:20
tc filter add dev $DEV parent 1:0 prio 0 protocol ip handle 21 fw flowid 1:21
# add TORSHAPER-OUT chain to the mangle table in iptables
iptables -t mangle -N TORSHAPER-OUT
iptables -t mangle -I $CHAIN -o $DEV -j TORSHAPER-OUT
# Set firewall marks
# Low priority to Tor
if [ ""$TOR_IP == "" ]
then
echo "Using UID-based QoS. UID $TOR_UID marked as low priority."
iptables -t mangle -A TORSHAPER-OUT -m owner --uid-owner $TOR_UID -j MARK --set-mark 21
else
echo "Using IP-based QoS. $TOR_IP marked as low priority."
iptables -t mangle -A TORSHAPER-OUT -s $TOR_IP -j MARK --set-mark 21
fi
# High prio for everything else
iptables -t mangle -A TORSHAPER-OUT -m mark --mark 0 -j MARK --set-mark 20
echo "Outbound shaping added to $DEV. Rate for Tor upload at least: ${RATE_UP_TOR}Kbyte/sec."
|