1 files changed, 87 insertions, 0 deletions
diff --git a/src/libsystemd-network/dhcp-identifier.h b/src/libsystemd-network/dhcp-identifier.h
new file mode 100644
index 0000000..96db588
--- /dev/null
+++ b/src/libsystemd-network/dhcp-identifier.h
@@ -0,0 +1,87 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#pragma once
+
+#include "sd-device.h"
+#include "sd-id128.h"
+
+#include "ether-addr-util.h"
+#include "macro.h"
+#include "sparse-endian.h"
+#include "time-util.h"
+#include "unaligned.h"
+
+#define SYSTEMD_PEN    43793
+
+typedef enum DUIDType {
+        DUID_TYPE_LLT       = 1,
+        DUID_TYPE_EN        = 2,
+        DUID_TYPE_LL        = 3,
+        DUID_TYPE_UUID      = 4,
+        _DUID_TYPE_MAX,
+        _DUID_TYPE_INVALID  = -EINVAL,
+        _DUID_TYPE_FORCE_U16 = UINT16_MAX,
+} DUIDType;
+
+/* RFC 8415 section 11.1:
+ * A DUID consists of a 2-octet type code represented in network byte order, followed by a variable number of
+ * octets that make up the actual identifier. The length of the DUID (not including the type code) is at
+ * least 1 octet and at most 128 octets. */
+#define MAX_DUID_DATA_LEN 128
+#define MAX_DUID_LEN (sizeof(be16_t) + MAX_DUID_DATA_LEN)
+
+/* https://tools.ietf.org/html/rfc3315#section-9.1 */
+struct duid {
+        be16_t type;
+        union {
+                struct {
+                        /* DUID_TYPE_LLT */
+                        be16_t htype;
+                        be32_t time;
+                        uint8_t haddr[];
+                } _packed_ llt;
+                struct {
+                        /* DUID_TYPE_EN */
+                        be32_t pen;
+                        uint8_t id[];
+                } _packed_ en;
+                struct {
+                        /* DUID_TYPE_LL */
+                        be16_t htype;
+                        uint8_t haddr[];
+                } _packed_ ll;
+                struct {
+                        /* DUID_TYPE_UUID */
+                        sd_id128_t uuid;
+                } _packed_ uuid;
+                struct {
+                        uint8_t data[MAX_DUID_DATA_LEN];
+                } _packed_ raw;
+        };
+} _packed_;
+
+int dhcp_identifier_set_duid_llt(
+                const struct hw_addr_data *hw_addr,
+                uint16_t arp_type,
+                usec_t t,
+                struct duid *ret_duid,
+                size_t *ret_len);
+int dhcp_identifier_set_duid_ll(
+                const struct hw_addr_data *hw_addr,
+                uint16_t arp_type,
+                struct duid *ret_duid,
+                size_t *ret_len);
+int dhcp_identifier_set_duid_en(struct duid *ret_duid, size_t *ret_len);
+int dhcp_identifier_set_duid_uuid(struct duid *ret_duid, size_t *ret_len);
+int dhcp_identifier_set_duid_raw(
+                DUIDType duid_type,
+                const uint8_t *buf,
+                size_t buf_len,
+                struct duid *ret_duid,
+                size_t *ret_len);
+int dhcp_identifier_set_iaid(
+                sd_device *dev,
+                const struct hw_addr_data *hw_addr,
+                bool legacy_unstable_byteorder,
+                void *ret);
+
+const char *duid_type_to_string(DUIDType t) _const_;