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-rw-r--r--lib/src/protocol/icmp.h84
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diff --git a/lib/src/protocol/icmp.h b/lib/src/protocol/icmp.h
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+/*
+ * Copyright (c) 2021-2022 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @file protocol/icmp.h
+ * @brief ICMP packet header
+ */
+#ifndef HICN_PROTOCOL_ICMP_H
+#define HICN_PROTOCOL_ICMP_H
+
+#include <hicn/common.h>
+
+/*
+ * The length of the ICMP header struct must be 4 bytes.
+ */
+#define EXPECTED_ICMP_HDRLEN 4
+
+typedef struct
+{
+ u8 type;
+ u8 code;
+ u16 csum;
+} _icmp_header_t;
+
+#define ICMP_HDRLEN sizeof (_icmp_header_t)
+static_assert (EXPECTED_ICMP_HDRLEN == ICMP_HDRLEN,
+ "Size of ICMP struct does not match its expected size.");
+
+/*
+ * The length of the ICMPWLDR header struct must be 4 bytes.
+ */
+#define EXPECTED_ICMPWLDR_HDRLEN 8
+
+typedef struct
+{
+ u8 type;
+ u8 code;
+ u16 csum;
+ union
+ {
+ struct
+ {
+ u16 id;
+ u16 sequence;
+ } echo; /* echo datagram */
+ u32 gateway; /* gateway address */
+ struct
+ {
+ u16 _unused;
+ u16 mtu;
+ } frag; /* path mtu discovery */
+ struct
+ {
+ u16 expected_lbl;
+ u16 received_lbl;
+ } wldr_notification_lbl;
+ };
+} _icmp_wldr_header_t;
+
+#define ICMPWLDR_HDRLEN sizeof (_icmp_wldr_header_t)
+static_assert (EXPECTED_ICMPWLDR_HDRLEN == ICMPWLDR_HDRLEN,
+ "Size of ICMPWLDR struct does not match its expected size.");
+
+#endif /* HICN_PROTOCOL_ICMP_H */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */