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commit c9bd40daaee18cf1d9824e4a7ebaebe321e0a5a8
Author: Carlos O'Donell <carlos@redhat.com>
Date: Tue Jun 7 04:46:37 2016 -0400
Bug 20214: Fix linux/in6.h and netinet/in.h sync.
In: https://sourceware.org/glibc/wiki/Synchronizing_Headers
we explain how we synchronize our headers with Linux kernel
headers.
In order to synchronize with the Linux linux/in6.h and
linux/ipv6.h headers we checked for their guard macros and
then defined __USE_KERNEL_IPV6_DEFS and conditionalized code
on this macro.
In upstream kernel 56c176c9 the _UAPI prefix was stripped and
this broke our synchronized headers again. We now need to check
for _LINUX_IN6_H and _IPV6_H, and keep checking the old versions
of the header guard checks for maximum backwards compatibility
with older Linux headers (the history is actually a bit muddled
here and it appears upstream linus kernel broke this 10 months
*before* our fix was ever applied to glibc, but without glibc
testing we didn't notice and distro kernels have their own
testing to fix this).
This patch fixes synchronization with linux/in6.h and
with netinet/in.h.
diff --git a/sysdeps/unix/sysv/linux/bits/in.h b/sysdeps/unix/sysv/linux/bits/in.h
index 9bdadf3..4d70a6b 100644
--- a/sysdeps/unix/sysv/linux/bits/in.h
+++ b/sysdeps/unix/sysv/linux/bits/in.h
@@ -25,8 +25,14 @@
kernel then we will not define the IPv6 IPPROTO_* defines, in6_addr (nor the
defines), sockaddr_in6, or ipv6_mreq. Same for in6_ptkinfo or ip6_mtuinfo
in linux/ipv6.h. The ABI used by the linux-kernel and glibc match exactly.
- Neither the linux kernel nor glibc should break this ABI without coordination. */
-#if defined _UAPI_LINUX_IN6_H || defined _UAPI_IPV6_H
+ Neither the linux kernel nor glibc should break this ABI without coordination.
+ In upstream kernel 56c176c9 the _UAPI prefix was stripped so we need to check
+ for _LINUX_IN6_H and _IPV6_H now, and keep checking the old versions for
+ maximum backwards compatibility. */
+#if defined _UAPI_LINUX_IN6_H \
+ || defined _UAPI_IPV6_H \
+ || defined _LINUX_IN6_H \
+ || defined _IPV6_H
/* This is not quite the same API since the kernel always defines s6_addr16 and
s6_addr32. This is not a violation of POSIX since POSIX says "at least the
following member" and that holds true. */
@@ -209,8 +215,10 @@ struct in_pktinfo
#define IPV6_TCLASS 67
/* Obsolete synonyms for the above. */
-#define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
-#define IPV6_DROP_MEMBERSHIP IPV6_LEAVE_GROUP
+#if !__USE_KERNEL_IPV6_DEFS
+# define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
+# define IPV6_DROP_MEMBERSHIP IPV6_LEAVE_GROUP
+#endif
#define IPV6_RXHOPOPTS IPV6_HOPOPTS
#define IPV6_RXDSTOPTS IPV6_DSTOPTS