1 files changed, 94 insertions, 0 deletions
diff --git a/shared/n-acd/src/n-acd.h b/shared/n-acd/src/n-acd.h
new file mode 100644
index 00000000..46394dca
--- /dev/null
+++ b/shared/n-acd/src/n-acd.h
@@ -0,0 +1,94 @@
+#pragma once
+
+/*
+ * IPv4 Address Conflict Detection
+ *
+ * This is the public header of the n-acd library, implementing IPv4 Address
+ * Conflict Detection as described in RFC-5227. This header defines the public
+ * API and all entry points of n-acd.
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <netinet/in.h>
+#include <stdbool.h>
+
+enum {
+        _N_ACD_E_SUCCESS,
+
+        N_ACD_E_DONE,
+        N_ACD_E_STOPPED,
+        N_ACD_E_PREEMPTED,
+
+        N_ACD_E_INVALID_ARGUMENT,
+        N_ACD_E_BUSY,
+};
+
+typedef struct NAcd NAcd;
+
+typedef struct NAcdConfig {
+        int ifindex;
+        unsigned int transport;
+        const uint8_t *mac;
+        size_t n_mac;
+        struct in_addr ip;
+        uint64_t timeout_msec;
+} NAcdConfig;
+
+typedef struct NAcdEvent {
+        unsigned int event;
+        union {
+                struct {
+                } ready, down;
+                struct {
+                        uint16_t operation;
+                        uint8_t *sender;
+                        size_t n_sender;
+                        struct in_addr target;
+                } used, defended, conflict;
+        };
+} NAcdEvent;
+
+enum {
+        N_ACD_TRANSPORT_ETHERNET,
+        _N_ACD_TRANSPORT_N,
+};
+
+enum {
+        N_ACD_EVENT_READY,
+        N_ACD_EVENT_USED,
+        N_ACD_EVENT_DEFENDED,
+        N_ACD_EVENT_CONFLICT,
+        N_ACD_EVENT_DOWN,
+        _N_ACD_EVENT_N,
+};
+
+enum {
+        N_ACD_DEFEND_NEVER,
+        N_ACD_DEFEND_ONCE,
+        N_ACD_DEFEND_ALWAYS,
+        _N_ACD_DEFEND_N,
+};
+
+int n_acd_new(NAcd **acdp);
+void n_acd_free(NAcd *acd);
+
+void n_acd_get_fd(NAcd *acd, int *fdp);
+
+int n_acd_dispatch(NAcd *acd);
+int n_acd_pop_event(NAcd *acd, NAcdEvent **eventp);
+int n_acd_announce(NAcd *acd, unsigned int defend);
+
+int n_acd_start(NAcd *acd, NAcdConfig *config);
+int n_acd_stop(NAcd *acd);
+
+static inline void n_acd_freep(NAcd **acd) {
+        if (*acd)
+                n_acd_free(*acd);
+}
+
+#ifdef __cplusplus
+}
+#endif