xdp-project-bng-router

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Toke Høiland-Jørgensen d38fb6ef73 Import build config and DHCP relay code from bpf-examples

The dhcp-relay utility was initially implemented as part of the
bpf-examples repository, but really belongs here. So import it along with
the build environment from bpf-examples.

Signed-off-by: Toke Høiland-Jørgensen <toke@toke.dk>

2021-08-18 14:40:32 +02:00

.gitignore

Import build config and DHCP relay code from bpf-examples

2021-08-18 14:40:32 +02:00

dhcp_kern_xdp.c

Import build config and DHCP relay code from bpf-examples

2021-08-18 14:40:32 +02:00

dhcp_user_xdp.c

Import build config and DHCP relay code from bpf-examples

2021-08-18 14:40:32 +02:00

dhcp-relay.h

Import build config and DHCP relay code from bpf-examples

2021-08-18 14:40:32 +02:00

Makefile

Import build config and DHCP relay code from bpf-examples

2021-08-18 14:40:32 +02:00

README

Import build config and DHCP relay code from bpf-examples

2021-08-18 14:40:32 +02:00

README

Usage
-----
dhcp_user_xdp takes network interface and dhcp relay server IP
as inputs and stores it in a map. Filters the incoming DHCP requests and inserts
option 82 in the DHCP request packets and overwrites the destination IP to that
of DHCP relay server IP.

Build instructions:
cd bpf-examples/dhcp-relay
make

Loading bpf program:
sudo ./dhcp_user_xdp -i <netif> -d <dhcp relay IP>
where,
netif: Ingress network interface name

unloading program:
sudo ./dhcp_user_xdp -i <netif> -u 

To run in SKB mode:
add option "-m skb" for both load and uload commands

Verify using tcpdump:
sudo tcpdump -s 0 -i <netif> port 67 and port 68 -vvv