xdp-filter: add page (#18049)

Co-authored-by: Harshavardhan <harshath3018@gmail.com>
Co-authored-by: Dylan <145150333+dmmqz@users.noreply.github.com>

pages/linux/xdp-filter.md

@@ -0,0 +1,29 @@
+# xdp-filter
+
+> Load and manage an eBPF XDP packet filter.
+> Part of the xdp-tools collection.
+> More information: <https://github.com/xdp-project/xdp-tools/tree/main/xdp-filter#running-xdp-filter>.
+
+- Load the filter on an interface in skb (generic) mode with default allow policy:
+
+`sudo xdp-filter load {{[-p|--policy]}} allow {{[-m|--mode]}} skb {{network_interface}}`
+
+- Unload the filter from an interface:
+
+`sudo xdp-filter unload {{network_interface}}`
+
+- Deny traffic to a specific destination port:
+
+`sudo xdp-filter port {{destination_port}}`
+
+- Deny traffic from a specific source IP address:
+
+`sudo xdp-filter ip {{[-m|--mode]}} src {{source_ip}}`
+
+- Deny traffic from a specific source MAC address:
+
+`sudo xdp-filter ether {{[-m|--mode]}} src {{mac_address}}`
+
+- Poll packets and show statistics every 10000 milliseconds:
+
+`sudo xdp-filter poll {{[-i|--interval]}} 10000`