Split logging logic from XDP program into its own files.

src/xdp/utils/logging.c

@@ -0,0 +1,53 @@
+#include <linux/ip.h>
+#include <linux/ipv6.h>
+
+#include <xdp/utils/helpers.h>
+#include <xdp/utils/maps.h>
+
+/**
+ * Logs a message to the filter ringbuffer map.
+ * 
+ * @param iph The IPv4 header.
+ * @param iph6 The IPv6 header.
+ * @param src_port The source port.
+ * @param dst_port The destination port.
+ * @param protocol The protocol.
+ * @param now The timestamp.
+ * @param pps The current PPS rate.
+ * @param bps The current BPS rate.
+ * @param filter_id The filter ID that matched.
+ * 
+ * @return always 0
+ */
+static __always_inline int LogFilterMsg(struct iphdr* iph, struct ipv6hdr* iph6, u16 src_port, u16 dst_port, u8 protocol, u64 now, u64 pps, u64 bps, int filter_id)
+{
+    filter_log_event_t* e = bpf_ringbuf_reserve(&filter_log_map, sizeof(*e), 0);
+
+    if (e)
+    {
+        e->ts = now;
+        e->filter_id = filter_id;
+
+        if (iph)
+        {
+            e->src_ip = iph->saddr;
+            e->dst_ip = iph->daddr;
+        } else if (iph6)
+        {
+            memcpy(&e->src_ip6, iph6->saddr.in6_u.u6_addr32, 4);
+            memcpy(&e->dst_ip6, iph6->daddr.in6_u.u6_addr32, 4);
+        }
+
+        e->src_port = src_port;
+        e->dst_port = dst_port;
+
+        e->protocol = protocol;
+
+        e->pps = pps;
+        e->bps = bps;
+
+        bpf_ringbuf_submit(e, 0);
+    }
+
+    return 0;
+}