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