sch_log 0.10

sch_log is a patch for Linux kernel that allows qdisc to mirror traffic that pass to a special network device which can be listened to with tcpdump.
This is an example of how to use it :
tc qdisc add dev eth0 root dup gap 1 limit 100
ping x.y.z.t
PING x.y.z.t (1.1.1.2) 56(84) bytes of data.
64 bytes from x.y.z.t (1.1.1.2): icmp_seq=1 ttl=62 time=0.687 ms
64 bytes from x.y.z.t (1.1.1.2): icmp_seq=1 ttl=62 time=1.07 ms (DUP!)
64 bytes from x.y.z.t (1.1.1.2): icmp_seq=2 ttl=62 time=0.710 ms
64 bytes from x.y.z.t (1.1.1.2): icmp_seq=2 ttl=62 time=0.739 ms (DUP!)
Enhancements:
- A possible leak.
- Some fixes in debug code, but also in the main code (related to fragments).