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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>
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