netdev - [PATCH iproute2] ip: Fix compilation break on old systems

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Date:   Mon, 13 Nov 2017 12:21:19 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     netdev@...r.kernel.org, Leon Romanovsky <leonro@...lanox.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Riad Abo Raed <riada@...lanox.com>
Subject: [PATCH iproute2] ip: Fix compilation break on old systems

From: Leon Romanovsky <leonro@...lanox.com>

As was reported [1], the iproute2 fails to compile on old systems,
in Cong's case, it was Fedora 19, in our case it was RedHat 7.2, which
failed with the following errors during compilation:

ipxfrm.c: In function ‘xfrm_selector_print’:
ipxfrm.c:479:7: error: ‘IPPROTO_MH’ undeclared (first use in this
function)
  case IPPROTO_MH:
       ^
ipxfrm.c:479:7: note: each undeclared identifier is reported only once
for each function it appears in
ipxfrm.c: In function ‘xfrm_selector_upspec_parse’:
ipxfrm.c:1345:8: error: ‘IPPROTO_MH’ undeclared (first use in this
function)
   case IPPROTO_MH:
        ^                                                                                                                                                            make[1]: *** [ipxfrm.o] Error 1

The reason to it is the order of headers files. The IPPROTO_MH field is
set in kernel's UAPI header file (in6.h), but only in case
__UAPI_DEF_IPPROTO_V6 is set before. That define comes from other kernel's
header file (libc-compat.h) and is set in case there are no previous
libc relevant declarations.

In ip code, the include of <netdb.h> causes to indirect inclusion of
<netinet/in.h> and it sets __UAPI_DEF_IPPROTO_V6 to be zero and prevents from
IPPROTO_MH declaration.

This patch takes the simplest possible approach to fix the compilation
error by checking if IPPROTO_MH was defined before and in case it
wasn't, it defines it to be the same as in the kernel.

[1] https://www.spinics.net/lists/netdev/msg463980.html

Cc: Cong Wang <xiyou.wangcong@...il.com>
Cc: Riad Abo Raed <riada@...lanox.com>
Signed-off-by: Leon Romanovsky <leonro@...lanox.com>
---
 ip/xfrm.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/ip/xfrm.h b/ip/xfrm.h
index 8566d639..71be574d 100644
--- a/ip/xfrm.h
+++ b/ip/xfrm.h
@@ -30,6 +30,10 @@
 #include <linux/xfrm.h>
 #include <linux/ipsec.h>

+#ifndef IPPROTO_MH
+#define IPPROTO_MH              135
+#endif
+
 #define XFRMS_RTA(x)  ((struct rtattr*)(((char*)(x)) + NLMSG_ALIGN(sizeof(struct xfrm_usersa_info))))
 #define XFRMS_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct xfrm_usersa_info))

--
2.15.0