[PATCH] llib/ibrte_net: workaround to avoid macro conflict

[Jingjing Wu <jingjing.wu-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>]

Macros such as IPPROTO_TCP, IPPROTO_UDP are already defined in <netinet/in.h>.
If user's application includes <netinet/in.h> and rte_ip.h at the same time,
there will be conflict error.

This patch uses the way "#ifndef #endif" to avoid the conflict. 

Signed-off-by: Jingjing Wu <jingjing.wu-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
---
 lib/librte_net/rte_ip.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/librte_net/rte_ip.h b/lib/librte_net/rte_ip.h
index e3f65c1..2bcb479 100644
--- a/lib/librte_net/rte_ip.h
+++ b/lib/librte_net/rte_ip.h
@@ -116,6 +116,8 @@ struct ipv4_hdr {
 
 #define	IPV4_HDR_OFFSET_UNITS	8
 
+#ifndef _NETINET_IN_H
+#ifndef _NETINET_IN_H_
 /* IPv4 protocols */
 #define IPPROTO_IP         0  /**< dummy for IP */
 #define IPPROTO_HOPOPTS    0  /**< IP6 hop-by-hop options */
@@ -227,6 +229,9 @@ struct ipv4_hdr {
 #define IPPROTO_RAW      255  /**< raw IP packet */
 #define IPPROTO_MAX      256  /**< maximum protocol number */
 
+#endif /*_NETINET_IN_H_*/
+#endif /*_NETINET_IN_H*/
+
 /*
  * IPv4 address types
  */
-- 
1.8.1.4