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Initial working version of DHCP relay using XDP is created. Currently, this code has user program and a xdp ebpf program. User program takes network interface and dhcp relay server IP as inputs and store it in a map. XDP program 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.An optional argu -ment for user program is also provided to unload the xdp program. README file provides to instructions to build and load the xdp program. Signed-off-by: Sachin Tiptur <sachin.tiptur.satyanarayana.gupta@hof-university.de> [ whitespace fixes ] Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
26 lines
640 B
Plaintext
26 lines
640 B
Plaintext
Usage
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dhcp_user_xdp takes network interface and dhcp relay server IP
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as inputs and stores it in a map. Filters the incoming DHCP requests and inserts
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option 82 in the DHCP request packets and overwrites the destination IP to that
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of DHCP relay server IP.
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Build instructions:
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cd bpf-examples/dhcp-relay
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make
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Loading bpf program:
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sudo ./dhcp_user_xdp -i <netif> -d <dhcp relay IP>
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where,
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netif: Ingress network interface name
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unloading program:
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sudo ./dhcp_user_xdp -i <netif> -u
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To run in SKB mode:
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add option "-m skb" for both load and uload commands
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Verify using tcpdump:
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sudo tcpdump -s 0 -i <netif> port 67 and port 68 -vvv
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