[OpenWrt-Devel] [PATCH] linux-3.18: prevent redefinition of struct ethhdr

[Alejandro Mery]

On 22/06/15 21:08, Alejandro Mery wrote:
> Hi,
>
> On 22/06/15 11:32, Karl Palsson wrote:
>>
>> Alejandro Mery <amery at geeks.cl> wrote:
>>> when using musl packages include netinet/ether.h break because
>>> struct ethhdr gets redefined.
>>>
>>> this patch comes includes a patch originally from sabotage linux
>>> and it has been submitted upstream https://lkml.org/lkml/2014/3/14/266
>>>
>>
>> If this gets merged, could we then drop the large and growing pile of
>> musl ether.h patches in each of the packages?  Is this going to get
>> _merged_ upstream, or was it just posted to LKML?  I didn't see any
>> discussion of it there.
>
> not sure if *all* related patches can be removed because some packages
> do very nasty stuff, but this at least fixes those not doing
> define/include witchcraft. also, here I'm only patching 3.18 and will
> 4.0 need similar love.
>
> this patch is happily used by openembedded and sabotage linux, but it
> might take a while upstream decides to take it into consideration...
> it's not that they enjoy becoming part of libc wars.
>
> but they did at least replace the #ifdef __GLIBC__ with a #ifndef
> __KERNEL__ in libc-compat.h, and that's something :)

An example of weakness of this patch is etherwake which breaks because 
it includes the kernel headers before libc's. so I suppose it's hard 
(impossible?) to find an almighty patch that fixes every case.


 From d25df0f20a5fd690a502a169c56a4cc0458bb6b1 Mon Sep 17 00:00:00 2001
From: Alejandro Mery <amery at geeks.cl>
Date: Mon, 22 Jun 2015 23:44:27 +0200
Subject: [PATCH] etherwake: prevent the redefinition of struct ethhdr

by including the libc headers first

Signed-off-by: Alejandro Mery <amery at geeks.cl>
---
  net/etherwake/patches/200-netinit-if_ether_h.patch | 24 
++++++++++++++++++++++
  1 file changed, 24 insertions(+)
  create mode 100644 net/etherwake/patches/200-netinit-if_ether_h.patch

diff --git a/net/etherwake/patches/200-netinit-if_ether_h.patch 
b/net/etherwake/patches/200-netinit-if_ether_h.patch
new file mode 100644
index 0000000..a29ea27
--- /dev/null
+++ b/net/etherwake/patches/200-netinit-if_ether_h.patch
@@ -0,0 +1,24 @@
+avoid redefinition of struct struct ethhdr by including
+the libc headers first.
+
+--- ./ether-wake.c.orig	2015-06-22 23:39:23.271788072 +0200
++++ ./ether-wake.c	2015-06-22 23:39:52.771788072 +0200
+@@ -82,6 +82,9 @@
+ #include <linux/if.h>
+
+ #include <features.h>
++#include <netdb.h>
++#include <netinet/ether.h>
++
+ #if __GLIBC__ >= 2 && __GLIBC_MINOR >= 1
+ #include <netpacket/packet.h>
+ #include <net/ethernet.h>
+@@ -90,8 +93,6 @@
+ #include <linux/if_packet.h>
+ #include <linux/if_ether.h>
+ #endif
+-#include <netdb.h>
+-#include <netinet/ether.h>
+
+ /* Grrr, no consistency between include versions.
+    Enable this if setsockopt() isn't declared with your library. */
-- 
2.4.4
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