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authorHauke Mehrtens <hauke@hauke-m.de>2019-02-14 14:18:00 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-02-20 10:13:21 +0100
commit28b5d0be0ab6427ee495fb4f10c0574f4132b360 (patch)
tree482140a53c0f6c3028d8ffee3a6862eedf0ea1e8
parent7cbbbf750ef6542aebc00993ded62cc9c3256a6c (diff)
uapi/if_ether.h: prevent redefinition of struct ethhdr
commit 6926e041a8920c8ec27e4e155efa760aa01551fd upstream. Musl provides its own ethhdr struct definition. Add a guard to prevent its definition of the appropriate musl header has already been included. glibc does not implement this header, but when glibc will implement this they can just define __UAPI_DEF_ETHHDR 0 to make it work with the kernel. Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
-rw-r--r--include/uapi/linux/if_ether.h3
-rw-r--r--include/uapi/linux/libc-compat.h6
2 files changed, 9 insertions, 0 deletions
diff --git a/include/uapi/linux/if_ether.h b/include/uapi/linux/if_ether.h
index 064d2026ab38..cb490cd9376f 100644
--- a/include/uapi/linux/if_ether.h
+++ b/include/uapi/linux/if_ether.h
@@ -22,6 +22,7 @@
#define _UAPI_LINUX_IF_ETHER_H
#include <linux/types.h>
+#include <linux/libc-compat.h>
/*
* IEEE 802.3 Ethernet magic constants. The frame sizes omit the preamble
@@ -136,11 +137,13 @@
* This is an Ethernet frame header.
*/
+#if __UAPI_DEF_ETHHDR
struct ethhdr {
unsigned char h_dest[ETH_ALEN]; /* destination eth addr */
unsigned char h_source[ETH_ALEN]; /* source ether addr */
__be16 h_proto; /* packet type ID field */
} __attribute__((packed));
+#endif
#endif /* _UAPI_LINUX_IF_ETHER_H */
diff --git a/include/uapi/linux/libc-compat.h b/include/uapi/linux/libc-compat.h
index e4f048ee7043..5da44c571cdd 100644
--- a/include/uapi/linux/libc-compat.h
+++ b/include/uapi/linux/libc-compat.h
@@ -184,4 +184,10 @@
#endif /* __GLIBC__ */
+/* Definitions for if_ether.h */
+/* allow libcs like musl to deactivate this, glibc does not implement this. */
+#ifndef __UAPI_DEF_ETHHDR
+#define __UAPI_DEF_ETHHDR 1
+#endif
+
#endif /* _UAPI_LIBC_COMPAT_H */