https://git.netfilter.org/iptables/commit/?id=0e7cf0ad306cdf95dc3c28d15a254532206a888e
https://bugs.gentoo.org/846377

From: Phil Sutter <phil@nwl.cc>
Date: Wed, 18 May 2022 16:04:09 +0200
Subject: Revert "fix build for missing ETH_ALEN definition"
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This reverts commit c5d9a723b5159a28f547b577711787295a14fd84 as it broke
compiling against musl libc. Might be a bug in the latter, but for the
time being try to please both by avoiding the include and instead
defining ETH_ALEN if unset.

While being at it, move netinet/ether.h include up.

Fixes: 1bdb5535f561a ("libxtables: Extend MAC address printing/parsing support")
Signed-off-by: Phil Sutter <phil@nwl.cc>
Reviewed-by: Maciej Żenczykowski <maze@google.com>
--- a/libxtables/xtables.c
+++ b/libxtables/xtables.c
@@ -28,6 +28,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
+#include <netinet/ether.h>
 #include <sys/socket.h>
 #include <sys/stat.h>
 #include <sys/statfs.h>
@@ -45,7 +46,6 @@
 
 #include <xtables.h>
 #include <limits.h> /* INT_MAX in ip_tables.h/ip6_tables.h */
-#include <linux/if_ether.h> /* ETH_ALEN */
 #include <linux/netfilter_ipv4/ip_tables.h>
 #include <linux/netfilter_ipv6/ip6_tables.h>
 #include <libiptc/libxtc.h>
@@ -72,6 +72,10 @@
 #define PROC_SYS_MODPROBE "/proc/sys/kernel/modprobe"
 #endif
 
+#ifndef ETH_ALEN
+#define ETH_ALEN 6
+#endif
+
 /* we need this for ip6?tables-restore.  ip6?tables-restore.c sets line to the
  * current line of the input file, in order  to give a more precise error
  * message.  ip6?tables itself doesn't need this, so it is initialized to the
@@ -2245,8 +2249,6 @@ void xtables_print_num(uint64_t number, unsigned int format)
 	printf(FMT("%4lluT ","%lluT "), (unsigned long long)number);
 }
 
-#include <netinet/ether.h>
-
 static const unsigned char mac_type_unicast[ETH_ALEN] =   {};
 static const unsigned char msk_type_unicast[ETH_ALEN] =   {1};
 static const unsigned char mac_type_multicast[ETH_ALEN] = {1};
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