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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
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.
This commit is contained in:
Carlos O'Donell 2016-06-07 04:46:37 -04:00
parent 47dd3543d3
commit c9bd40daae
2 changed files with 26 additions and 5 deletions
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15
ChangeLog
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@ -1,4 +1,17 @@
2016-06-03 Carlos O'Donell <carlos@redhat.com>
2016-06-07 Carlos O'Donell <carlos@redhat.com>
[BZ #20214]
* sysdeps/unix/sysv/linux/bits/in.h
[defined _UAPI_LINUX_IN6_H || defined _UAPI_IPV6_H
|| defined _LINUX_IN6_H || defined _IPV6_H] (__USE_KERNEL_IPV6_DEFS):
Define to 1.
[!(defined _UAPI_LINUX_IN6_H || defined _UAPI_IPV6_H
|| defined _LINUX_IN6_H || defined _IPV6_H)] (__USE_KERNEL_IPV6_DEFS):
Define to 0.
[!__USE_KERNEL_IPV6_DEFS] (IPV6_ADD_MEMBERSHIP): Define.
[!__USE_KERNEL_IPV6_DEFS] (IPV6_DROP_MEMBERSHIP): Define.
2016-06-06 Carlos O'Donell <carlos@redhat.com>
[BZ #20198]
* stdlib/Makefile (tests): Add tst-quick_exit, and

16
sysdeps/unix/sysv/linux/bits/in.h
View File

@ -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