diff --git a/libc/include/netinet/igmp.h b/libc/include/netinet/igmp.h
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+++ b/libc/include/netinet/igmp.h
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+/*
+ * Copyright (C) 2024 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#pragma once
+
+/**
+ * @file netinet/igmp.h
+ * @brief Internet Group Management Protocol (IGMP).
+ */
+
+#include <sys/cdefs.h>
+#include <netinet/in.h>
+
+#include <linux/igmp.h>
+
+/**
+ * The uapi type is called `igmphdr`,
+ * doesn't have the `igmp_` prefix on each field,
+ * and uses a `__be32` for the group address.
+ *
+ * This is the type that BSDs and musl/glibc expose to userspace.
+ */
+struct igmp {
+  uint8_t igmp_type;
+  uint8_t igmp_code;
+  uint16_t igmp_cksum;
+  struct in_addr igmp_group;
+};
+
+/** Commonly-used BSD synonym for the Linux constant. */
+#define IGMP_MEMBERSHIP_QUERY IGMP_HOST_MEMBERSHIP_QUERY