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This example shows how a combination of BPF programs can be used to perform
per-IP classification and rate limiting. The simulation in this example
shows an example where N+M devices are combined and use 1 WAN. Traffic sent
from/to the "neighbor" devices have their combined bandwidth capped at
128kbit, and the rest of the traffic can use an additional 1Mbit.
This works by sharing a map between various tc ingress filters, each with
a related set of bpf functions attached. The map stores a list of dynamically
learned ip addresses that were seen on the neighbor devices and should be
throttled.
/------------\ |
neigh1 --|->->->->->->->-| | |
neigh2 --|->->->->->->->-| <-128kb-| /------\ |
neigh3 --|->->->->->->->-| | wan0 | wan | |
| ^ | br100 |-<-<-<--| sim | |
| clsfy_neigh() | | ^ \------/ |
lan1 ----|->->->->->->->-| <--1Mb--| | |
lan2 ----|->->->->->->->-| | classify_wan() |
^ \------------/ |
pass() |
To run the example:
$ sudo /path/to/neighbor_sharing/neighbor_sharing.py
Starting netserver with host 'IN(6)ADDR_ANY' port '12865' and family AF_UNSPEC
Starting netserver with host 'IN(6)ADDR_ANY' port '12865' and family AF_UNSPEC
Starting netserver with host 'IN(6)ADDR_ANY' port '12865' and family AF_UNSPEC
Starting netserver with host 'IN(6)ADDR_ANY' port '12865' and family AF_UNSPEC
Starting netserver with host 'IN(6)ADDR_ANY' port '12865' and family AF_UNSPEC
Network ready. Create a shell in the wan0 namespace and test with netperf
(Neighbors are 172.16.1.100-102, and LAN clients are 172.16.1.150-151)
e.g.: ip netns exec wan0 netperf -H 172.16.1.100 -l 2
Press enter when finished:
In another shell:
$ sudo ip netns exec wan0 netperf -H 172.16.1.100 -l 2
MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 172.16.1.100 () port 0 AF_INET : demo
Recv Send Send
Socket Socket Message Elapsed
Size Size Size Time Throughput
bytes bytes bytes secs. 10^6bits/sec
87380 16384 16384 4.30 0.18
$ sudo ip netns exec wan0 netperf -H 172.16.1.150 -l 2
MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 172.16.1.150 () port 0 AF_INET : demo
Recv Send Send
Socket Socket Message Elapsed
Size Size Size Time Throughput
bytes bytes bytes secs. 10^6bits/sec
87380 16384 16384 4.10 1.01
The bandwidth is throttled according to the IP.