README.txt
1This example shows a unique way to use a BPF program to demux any ethernet
2traffic into a pool of worker veth+namespaces (or any ifindex-based
3destination) depending on a configurable mapping of src-mac to ifindex. As
4part of the ingress processing, the program will dynamically learn the source
5ifindex of the matched source mac.
6
7Simulate a physical network with a vlan aware switch and clients that may
8connect to any vlan. The program will detect the known clients and pass the
9traffic through to a dedicated namespace for processing. Clients may have
10overlapping IP spaces and the traffic will still work.
11
12 | bpf program |
13cli0 --| | /--|-- worker0 |
14cli1 --| trunk | +->--->-handle_p2v(pkt)-> /---|-- worker1 |
15cli2 --|=======|=+ /----|-- worker2 |
16... --| | +-<---<-handle_v2p(pkt)-<-----|-- ... |
17cliN --| | \----|-- workerM |
18 | | ^ |
19 phys | veth |
20 switch | |
21
22To run the example, simply:
23
24sudo /path/to/vlan_learning/vlan_learning.py
25
26Serving HTTP on 0.0.0.0 port 80 ...
27Serving HTTP on 0.0.0.0 port 80 ...
28Serving HTTP on 0.0.0.0 port 80 ...
29 % Total % Received % Xferd Average Speed Time Time Time Current
30 Dload Upload Total Spent Left Speed
31 0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0172.16.1.100 - - [04/Nov/2015 10:54:47] "GET / HTTP/1.1" 200 -
32100 574 100 574 0 0 45580 0 --:--:-- --:--:-- --:--:-- 47833
33
34...
35
36Press enter to exit:
37mac 020000000000 rx pkts = 95, rx bytes = 7022
38 tx pkts = 0, tx bytes = 0
39mac 020000000001 rx pkts = 95, rx bytes = 7022
40 tx pkts = 0, tx bytes = 0
41mac 020000000002 rx pkts = 97, rx bytes = 7154
42 tx pkts = 0, tx bytes = 0
43
44