Re: fw mark based tc class selection not working

[Andy Furniss <adf.lists@gmail.com>]

Akshat Kakkar wrote:
> Recently I came to know that, Without any options fw classifier maps
> fwmark to classid.
>
> tc filter add dev <iface> parent <qhandle> protocol ip prio 1 fw
>
> i.e. if my packet has mark(0x10001) and class id is not set, then
> above tc filter, will set class id = 0x10001 i.e. 1:1
>
> But when I am trying it out, its not working! I am having class 1:1
> defined but its not at all hit.
>
> Am I missing something out here?

Seems to be broken, below is a paste from a mail I sent to this list 2
years ago showing it working. The same test now (apart from I am using
eth2 instead of eth0) doesn't work.

tc qdisc add dev eth0 root handle 1: htb
tc class add dev eth0 parent 1: classid 1:a htb rate 1mbit
tc class add dev eth0 parent 1: classid 1:b htb rate 1mbit
tc class add dev eth0 parent 1: classid 1:c htb rate 1mbit
tc filter add dev eth0 parent 1:0 protocol ip fw

iptables -t mangle -I OUTPUT -o eth0 -p tcp -j MARK --set-mark 0x1000a
iptables -t mangle -I OUTPUT -o eth0 -p icmp -j MARK --set-mark 0x1000b
iptables -t mangle -I OUTPUT -o eth0 -p udp -j MARK --set-mark 0x1000c


ph4[/home/andy]# iptables -L OUTPUT -vnt mangle

Chain OUTPUT (policy ACCEPT 84 packets, 14747 bytes)
pkts bytes target     prot opt in     out     source destination
    3   196 MARK       udp  --  *      eth0    0.0.0.0/0 0.0.0.0/0 
       MARK set 0x1000c
    7   588 MARK       icmp --  *      eth0    0.0.0.0/0 0.0.0.0/0 
       MARK set 0x1000b
   74 13963 MARK       tcp  --  *      eth0    0.0.0.0/0 0.0.0.0/0 
       MARK set 0x1000a


ph4[/home/andy]# tc -s class ls dev eth0

class htb 1:c root prio 0 rate 1000Kbit ceil 1000Kbit burst 2850b cburst 
2850b
Sent 238 bytes 3 pkt (dropped 0, overlimits 0 requeues 0)
rate 0bit 0pps backlog 0b 0p requeues 0
lended: 3 borrowed: 0 giants: 0
tokens: 346750 ctokens: 346750

class htb 1:a root prio 0 rate 1000Kbit ceil 1000Kbit burst 2850b cburst 
2850b
Sent 14999 bytes 74 pkt (dropped 0, overlimits 0 requeues 0)
rate 32bit 0pps backlog 0b 0p requeues 0
lended: 74 borrowed: 0 giants: 0
tokens: 348000 ctokens: 348000

class htb 1:b root prio 0 rate 1000Kbit ceil 1000Kbit burst 2850b cburst 
2850b
Sent 686 bytes 7 pkt (dropped 0, overlimits 0 requeues 0)
rate 0bit 0pps backlog 0b 0p requeues 0
lended: 7 borrowed: 0 giants: 0
tokens: 344000 ctokens: 344000