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This example shows a unique way to use a BPF program to demux any ethernet
traffic into a pool of worker veth+namespaces (or any ifindex-based
destination) depending on a configurable mapping of src-mac to ifindex. As
part of the ingress processing, the program will dynamically learn the source
ifindex of the matched source mac.
Simulate a physical network with a vlan aware switch and clients that may
connect to any vlan. The program will detect the known clients and pass the
traffic through to a dedicated namespace for processing. Clients may have
overlapping IP spaces and the traffic will still work.
| bpf program |
cli0 --| | /--|-- worker0 |
cli1 --| trunk | +->--->-handle_p2v(pkt)-> /---|-- worker1 |
cli2 --|=======|=+ /----|-- worker2 |
... --| | +-<---<-handle_v2p(pkt)-<-----|-- ... |
cliN --| | \----|-- workerM |
| | ^ |
phys | veth |
switch | |
To run the example, simply:
sudo /path/to/vlan_learning/vlan_learning.py
Serving HTTP on 0.0.0.0 port 80 ...
Serving HTTP on 0.0.0.0 port 80 ...
Serving HTTP on 0.0.0.0 port 80 ...
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0172.16.1.100 - - [04/Nov/2015 10:54:47] "GET / HTTP/1.1" 200 -
100 574 100 574 0 0 45580 0 --:--:-- --:--:-- --:--:-- 47833
...
Press enter to exit:
mac 020000000000 rx pkts = 95, rx bytes = 7022
tx pkts = 0, tx bytes = 0
mac 020000000001 rx pkts = 95, rx bytes = 7022
tx pkts = 0, tx bytes = 0
mac 020000000002 rx pkts = 97, rx bytes = 7154
tx pkts = 0, tx bytes = 0