Thanks for this advice Anatoly, I corrected the script to redirect all
incoming traffic to ifb0, and now statistics on the ifb0 classes and
qdiscs are incrementing, but they're still not incrementing in the way I
expect. Outgoing traffic is still getting classified as expected: If I
make a request with TOS 28, I watch the statistics of eth0.2 class 2:3
increment, but the response causes ifb0 class 2:2 to increment, not 2:3.
I think that the TOS field is correctly matched and the mark is
correctly saved and restored, but only outgoing traffic is getting
classified based on the mark? Do you have any more suggestions how to
investigate why incoming traffic isn't getting classified? or is there
another way to classify response traffic based on the TOS/DSCP field of
the request?
Here is the corrected script:
1: iptables -N NEW_CONN -t mangle
2: iptables -A NEW_CONN -t mangle -m tos --tos 12 -j MARK --set-mark 1
3: iptables -A NEW_CONN -t mangle -m tos --tos 28 -j MARK --set-mark 2
4: iptables -A NEW_CONN -t mangle -m mark --mark 0 -j MARK --set-mark 3
5: iptables -A NEW_CONN -t mangle -j CONNMARK --save-mark
6:
7: iptables -A PREROUTING -t mangle -m conntrack --ctstate INVALID
-j DROP
8: iptables -A PREROUTING -t mangle -m conntrack --ctstate
ESTABLISHED -j CONNMARK --restore-mark
9: iptables -A PREROUTING -t mangle -m conntrack --ctstate
NEW,RELATED -j NEW_CONN
10:
11: ifconfig ifb0 up
12:
13: insmod sch_ingress
14: tc qdisc add dev eth0.2 ingress
15:
16: insmod cls_u32
17: insmod act_mirred
18: tc filter add dev eth0.2 parent ffff: protocol ip pref 1 handle 1
u32 match u32 0 0 action mirred egress redirect dev ifb0
19:
20: # Limit up and downstream to 1mbit, to "own" the queue
21: insmod sch_tbf
22: tc qdisc add dev eth0.2 root handle 1 tbf rate 1mbit burst 5k
latency 70ms
23: tc qdisc add dev ifb0 root handle 1 tbf rate 1mbit burst 5k
latency 70ms
24:
25: # High, low, and "other" priority
26: insmod sch_prio
27: tc qdisc add dev eth0.2 parent 1: handle 2 prio
28: tc qdisc add dev ifb0 parent 1: handle 2 prio
29:
30: insmod cls_fw
31:
32: # Classify request traffic from proxy server based on mark
33: tc filter add dev eth0.2 parent 2: protocol ip pref 1 handle 1 fw
flowid :1
34: tc filter add dev eth0.2 parent 2: protocol ip pref 1 handle 2 fw
flowid :3
35: tc filter add dev eth0.2 parent 2: protocol ip pref 1 handle 3 fw
flowid :2
36:
37: # Classify response traffic from origin server based on restored mark
38: tc filter add dev ifb0 parent 2: protocol ip pref 1 handle 1 fw
flowid :1
39: tc filter add dev ifb0 parent 2: protocol ip pref 1 handle 2 fw
flowid :3
40: tc filter add dev ifb0 parent 2: protocol ip pref 1 handle 3 fw
flowid :2
On 10/12/12 12:11 PM, Anatoly Muliarski wrote:
IMHO, the problem lies in next - incoming packets on eth0.2 have no
mark and therefore they cannot be forwarded into ifb0 on the current
classification scheme. You should redirect all incoming packets( or
use non-mark redirection criteria ) into ifb0 and then classify and
shape them on ifb0 device.
To more clarify the way of a packet look at
http://en.wikipedia.org/wiki/File:Netfilter-packet-flow.svg
2012/12/10, Jack Bates <uo4zau@xxxxxxxxxxxxxxxx>:
Thank you for this clarification, and your assumptions are correct: I'm
trying to prioritize incoming and outgoing traffic on eth0.2, ifb0 is
for shaping the incoming traffic.
But I'm still failing to filter incoming traffic based on the restored
mark: statistics on the ifb0 qdiscs and classes remain zero. Filtering
outgoing traffic is working as expected, statistics on the eth0.2
classes are incrementing as expected, which I think means that the
PREROUTING --restore-mark target is working?
Do you have any other suggestions how to investigate why incoming
traffic isn't getting filtered? or is there another way to classify
response traffic from the origin server based on the TOS/DSCP field of
the request from the proxy server? Are there any more details that would
help explain the problem?
Here is the clarified script:
1: iptables -N NEW_CONN -t mangle
2: iptables -A NEW_CONN -t mangle -m tos --tos 12 -j MARK --set-mark 1
3: iptables -A NEW_CONN -t mangle -m tos --tos 28 -j MARK --set-mark 2
4: iptables -A NEW_CONN -t mangle -m mark --mark 0 -j MARK --set-mark 3
5: iptables -A NEW_CONN -t mangle -j CONNMARK --save-mark
6:
7: iptables -A PREROUTING -t mangle -m conntrack --ctstate INVALID
-j DROP
8: iptables -A PREROUTING -t mangle -m conntrack --ctstate
ESTABLISHED -j CONNMARK --restore-mark
9: iptables -A PREROUTING -t mangle -m conntrack --ctstate
NEW,RELATED -j NEW_CONN
10:
11: ifconfig ifb0 up
12:
13: insmod sch_ingress
14: tc qdisc add dev eth0.2 ingress
15:
16: # Classify response traffic from origin server based on restored
mark
17: insmod cls_fw
18: insmod act_mirred
19: tc filter add dev eth0.2 parent ffff: protocol ip pref 1 handle 1
fw flowid 2:1 action mirred egress redirect dev ifb0
20: tc filter add dev eth0.2 parent ffff: protocol ip pref 1 handle 2
fw flowid 2:3 action mirred egress redirect dev ifb0
21: tc filter add dev eth0.2 parent ffff: protocol ip pref 1 handle 3
fw flowid 2:2 action mirred egress redirect dev ifb0
22:
23: # Limit up and downstream to 1mbit, to "own" the queue
24: insmod sch_tbf
25: tc qdisc add dev eth0.2 root handle 1 tbf rate 1mbit burst 5k
latency 70ms
26: tc qdisc add dev ifb0 root handle 1 tbf rate 1mbit burst 5k
latency 70ms
27:
28: # High, low, and "other" priority
29: insmod sch_prio
30: tc qdisc add dev eth0.2 parent 1: handle 2 prio
31: tc qdisc add dev ifb0 parent 1: handle 2 prio
32:
33: # Classify request traffic from proxy server based on mark
34: tc filter add dev eth0.2 parent 2: protocol ip pref 1 handle 1 fw
flowid :1
35: tc filter add dev eth0.2 parent 2: protocol ip pref 1 handle 2 fw
flowid :3
36: tc filter add dev eth0.2 parent 2: protocol ip pref 1 handle 3 fw
flowid :2
On 05/12/12 08:18 PM, Anatoly Muliarski wrote:
IMHO, there is a bit of mess in your scheme.
Let's clarify it :)
If my assumptions are right then:
1. eth0.2 is the external shaper interface.
2. ifb0 is using for shaping incoming traffic on this interface.
To set marks for the traffic you should use something like these:
iptables -t manlge -N NEW_CONN
iptables -t mangle -A NEW_CONN -m tos --tos 12 -j MARK --set-mark 1
iptables -t mangle -A NEW_CONN -m tos --tos 28 -j MARK --set-mark 2
# to mark all the unmatched traffic and treat it separately in your
shaper
iptables -t mangle -A NEW_CONN -m mark --mark 0 -j MARK --set-mark 3
iptables -t mangle -A NEW_CONN -j CONNMARK --save-mark
iptables -t mangle -A PREROUTING -m conntrack --cstate INVALID -j DROP
iptables -t mangle -A PREROUTING -m conntrack --cstate ESTABLISHED -j
CONNMARK --restore-mark
iptables -t mangle -A PREROUTING -m conntrack --cstate NEW,RELATED -g
NEW_CONN
2012/12/5, Jack Bates <uo4zau@xxxxxxxxxxxxxxxx>:
Thanks for this help, I think the marks are getting saved/restored
successfully, and I can successfully classify request traffic from the
proxy server based on the mark (statistics on the eth0.2 classes are
incrementing) but response traffic from the origin server isn't getting
classified yet (statistics on the ifb0 classes remain zero).
Here is my complete work in progress script. How can I investigate why
response traffic isn't getting classified? Are there any more details
that would help explain why not?
How can I classify traffic based on the restored mark? or is there
another way to classify response traffic from the origin server based on
the TOS/DSCP field of the request?
1: # Save/restore connection mark based on TOS field
2: iptables -A PREROUTING -t mangle -j CONNMARK --restore-mark
3: iptables -A PREROUTING -t mangle -m tos --tos 12 -j MARK
--set-mark
1
4: iptables -A PREROUTING -t mangle -m tos --tos 28 -j MARK
--set-mark
2
5: iptables -A PREROUTING -t mangle -j CONNMARK --save-mark
6:
7: ifconfig ifb0 up
8:
9: insmod sch_ingress
10: tc qdisc add dev eth0.2 ingress
11:
12: # Classify response traffic from origin server based on restored
mark
13: insmod cls_fw
14: insmod act_mirred
15: tc filter add dev eth0.2 parent ffff: protocol ip pref 1 handle
1
fw flowid 2:1 action mirred egress redirect dev ifb0
16: tc filter add dev eth0.2 parent ffff: protocol ip pref 1 handle
2
fw flowid 2:3 action mirred egress redirect dev ifb0
17:
18: # Send unmarked traffic to class 2:2
19: insmod cls_u32
20: tc filter add dev eth0.2 parent ffff: protocol ip pref 1 u32
match u32 0 0 flowid 2:2 action mirred egress redirect dev ifb0
21:
22: # Limit up and downstream to 1mbit, to "own" the queue
23: insmod sch_tbf
24: tc qdisc add dev eth0.2 root handle 1 tbf rate 1mbit burst 5k
latency 70ms
25: tc qdisc add dev ifb0 root handle 1 tbf rate 1mbit burst 5k
latency 70ms
26:
27: # High, low, and "other" priority
28: insmod sch_prio
29: tc qdisc add dev eth0.2 parent 1: handle 2 prio
30: tc qdisc add dev ifb0 parent 1: handle 2 prio
31:
32: # Classify request traffic from proxy server based on mark
33: tc filter add dev eth0.2 parent 2: protocol ip pref 1 handle 1
fw
flowid :1
34: tc filter add dev eth0.2 parent 2: protocol ip pref 1 handle 2
fw
flowid :3
On 05/12/12 01:12 AM, Eliezer Croitoru wrote:
Thanks Anatoly,
My idea was that based on a mark he will jump the packets to another
table which HE will mark TOS/DSCP.
Eliezer
On 12/5/2012 4:39 AM, Anatoly Muliarski wrote:
Hi Jack,
--restore-mark should be used for existing connections and to mark new
ones you may use something like that:
iptables -t mangle -A PREROUTING -i eth0.2 -m tos --tos 1 -m conntrack
--cstate NEW,RELATED -j MARK --set-mark 1
The main idea consists in marking packets on the physical input
interface and shaping them on ifb0( where they arrive already marked
).
iptables' packet marks exist only in memory of one computer, TOS/DSCP
may be used for transmitting a map of them to another one.
BTW, use --restore-mark on the output interface of your shaper too.
2012/12/3, Jack Bates <uo4zau@xxxxxxxxxxxxxxxx>:
Thanks a lot for your help, how can I evaluate --restore-mark before
I
classify and shape response traffic from the origin server?
I think you mean something like:
# Copy ctmart to nfmark (e.g. 1, 2)
iptables -A PREROUTING -t mangle -i eth0.2 -j CONNMARK
--restore-mark
# Classify by nfmark (e.g. 1, 2), send unmarked traffic to class
2:2
tc filter add dev eth0.2 parent ffff: protocol ip handle 1 fw
flowid
2:1 action mirred egress redirect dev ifb0
tc filter add dev eth0.2 parent ffff: protocol ip handle 2 fw
flowid
2:3 action mirred egress redirect dev ifb0
tc filter add dev eth0.2 parent ffff: protocol ip u32 match u32 0
0
flowid 2:2 action mirred egress redirect dev ifb0
Just how can I get --restore-mark to evaluate before tc filter?
Another way I can imagine is with the CLASSIFY target:
# Send unmarked traffic to class 2:2
iptables -A PREROUTING -t mangle -i eth0.2 -m connmark --mark 1
-j
CLASSIFY 2:1
iptables -A PREROUTING -t mangle -i eth0.2 -m connmark --mark 2
-j
CLASSIFY 2:3
iptables -A PREROUTING -t mangle -i eth0.2 -j CLASSIFY 2:2
But I have the same challenge, how can I evaluate the CLASSIFY target
before I shape traffic?
Or is there another way to classify and shape response traffic from
the
origin server based on the TOS/DSCP field of the request?
On 03/12/12 03:52 AM, Eliezer Croitoru wrote:
You use iptables mark + restore mark based on connection tracking.
you can mark the TOS on the outgoing postrouting table.
you can take a look at the iptabes man pages:
http://ipset.netfilter.org/iptables.man.html
which has --restore-mark exaple.
Eliezer
On 12/3/2012 10:43 AM, Jack Bates wrote:
I can imagine a couple ways of classifying traffic from our proxy
server
based on the TOS/DSCP field, and also how to set the connection
mark
based on this field. But how do I classify and shape response
traffic
from the origin server based on the connection mark?
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