target/linux/generic/patches-4.9/272-uapi-if_ether.h-prevent-redefinition-of-struct-ethhd.patch

   1 From fcbb6fed85ea9ff4feb4f1ebd4f0f235fdaf06b6 Mon Sep 17 00:00:00 2001
   2 From: David Heidelberger <david.heidelberger@ixit.cz>
   3 Date: Mon, 29 Jun 2015 16:53:03 +0200
   4 Subject: [PATCH 3/3] uapi/if_ether.h: prevent redefinition of struct ethhdr
   5
   6 Musl provides its own ethhdr struct definition. Add a guard to prevent
   7 its definition of the appropriate musl header has already been included.
   8
   9 Signed-off-by: John Spencer <maillist-linux@barfooze.de>
  10 Tested-by: David Heidelberger <david.heidelberger@ixit.cz>
  11 Signed-off-by: Jonas Gorski <jogo@openwrt.org>
  12 ---
  13  include/uapi/linux/if_ether.h    |  3 +++
  14  include/uapi/linux/libc-compat.h | 11 +++++++++++
  15  2 files changed, 14 insertions(+)
  16
  17 --- a/include/uapi/linux/if_ether.h
  18 +++ b/include/uapi/linux/if_ether.h
  19 @@ -22,6 +22,7 @@
  20  #define _UAPI_LINUX_IF_ETHER_H
  21
  22  #include <linux/types.h>
  23 +#include <linux/libc-compat.h>
  24
  25  /*
  26   *     IEEE 802.3 Ethernet magic constants.  The frame sizes omit the preamble
  27 @@ -138,11 +139,13 @@
  28   *     This is an Ethernet frame header.
  29   */
  30
  31 +#if __UAPI_DEF_ETHHDR
  32  struct ethhdr {
  33         unsigned char   h_dest[ETH_ALEN];       /* destination eth addr */
  34         unsigned char   h_source[ETH_ALEN];     /* source ether addr    */
  35         __be16          h_proto;                /* packet type ID field */
  36  } __attribute__((packed));
  37 +#endif
  38
  39
  40  #endif /* _UAPI_LINUX_IF_ETHER_H */
  41 --- a/include/uapi/linux/libc-compat.h
  42 +++ b/include/uapi/linux/libc-compat.h
  43 @@ -89,6 +89,14 @@
  44
  45  #endif /* _NET_IF_H */
  46
  47 +/* musl defines the ethhdr struct itself in its netinet/if_ether.h.
  48 + * Glibc just includes the kernel header and uses a different guard. */
  49 +#if defined(_NETINET_IF_ETHER_H)
  50 +#define __UAPI_DEF_ETHHDR              0
  51 +#else
  52 +#define __UAPI_DEF_ETHHDR              1
  53 +#endif
  54 +
  55  /* Coordinate with libc netinet/in.h header. */
  56  #if defined(_NETINET_IN_H)
  57
  58 @@ -184,6 +192,9 @@
  59  /* For the future if glibc adds IFF_LOWER_UP, IFF_DORMANT and IFF_ECHO */
  60  #define __UAPI_DEF_IF_NET_DEVICE_FLAGS_LOWER_UP_DORMANT_ECHO 1
  61
  62 +/* Definitions for if_ether.h */
  63 +#define __UAPI_DEF_ETHHDR              1
  64 +
  65  /* Definitions for in.h */
  66  #define __UAPI_DEF_IN_ADDR             1
  67  #define __UAPI_DEF_IN_IPPROTO          1