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Date:   Sun, 22 Dec 2019 00:02:27 -0600
From:   "A. Wilcox" <>
Cc:     "A. Wilcox" <>
Subject: [PATCH] uapi: Prevent redefinition of struct iphdr

As with struct ethhdr, the musl libc provides its own definition of the
iphdr struct.  This guard ensures software like net-tools builds correctly
on the musl libc.

The __UAPI_DEF_IPHDR definition is in ip.h itself to prevent the issue in
commit da360299b673 ("uapi/if_ether.h: move __UAPI_DEF_ETHHDR libc define")
from being seen here.

Signed-off-by: A. Wilcox <>
 include/uapi/linux/ip.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/uapi/linux/ip.h b/include/uapi/linux/ip.h
index e42d13b55cf3..d34a0d295672 100644
--- a/include/uapi/linux/ip.h
+++ b/include/uapi/linux/ip.h
@@ -83,6 +83,13 @@
+/* Allow libcs to deactivate this - musl has its own copy in <netinet/ip.h> */
+#ifndef __UAPI_DEF_IPHDR
+#define __UAPI_DEF_IPHDR	1
 struct iphdr {
 	__u8	ihl:4,
@@ -104,6 +111,7 @@ struct iphdr {
 	__be32	daddr;
 	/*The options start here. */
 struct ip_auth_hdr {

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