datapath: Add missing definitions for building GRE on older kernels

6 files changed, 52 insertions, 3 deletions

diff --git a/acinclude.m4 b/acinclude.m4
index e4fa5e621..490936e1d 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -139,6 +139,8 @@ AC_DEFUN([OVS_CHECK_LINUX26_COMPAT], [
   rm -f datapath/linux-2.6/kcompat.h.new
   mkdir -p datapath/linux-2.6
   : > datapath/linux-2.6/kcompat.h.new
+  OVS_GREP_IFELSE([$KSRC26/include/linux/types.h], [bool],
+                  [OVS_DEFINE([HAVE_BOOL_TYPE])])
   OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], [skb_transport_header],
                   [OVS_DEFINE([HAVE_SKBUFF_HEADER_HELPERS])])
   OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], [raw],
@@ -154,6 +156,10 @@ AC_DEFUN([OVS_CHECK_LINUX26_COMPAT], [
                   [OVS_DEFINE([HAVE_CSUM_UNFOLD])])
   OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], [skb_cow],
                   [OVS_DEFINE([HAVE_SKB_COW])])
+  OVS_GREP_IFELSE([$KSRC26/include/net/netlink.h], [nla_get_be16],
+                  [OVS_DEFINE([HAVE_NLA_GET_BE16])])
+  OVS_GREP_IFELSE([$KSRC26/include/linux/in.h], [ipv4_is_multicast],
+                  [OVS_DEFINE([HAVE_IPV4_IS_MULTICAST])])
   # Check for the proto_data_valid member in struct sk_buff.  The [^@]
   # is necessary because some versions of this header remove the
   # member but retain the kerneldoc comment that describes it (which
diff --git a/datapath/linux-2.6/compat-2.6/include/linux/in.h b/datapath/linux-2.6/compat-2.6/include/linux/in.h
index 2cfe6450e..fd5c3c673 100644
--- a/datapath/linux-2.6/compat-2.6/include/linux/in.h
+++ b/datapath/linux-2.6/compat-2.6/include/linux/in.h
@@ -3,14 +3,13 @@
 
 #include_next <linux/in.h>
 
-#include <linux/version.h>
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,25)
+#ifndef HAVE_IPV4_IS_MULTICAST
 
 static inline bool ipv4_is_multicast(__be32 addr)
 {
 	return (addr & htonl(0xf0000000)) == htonl(0xe0000000);
 }
 
-#endif /* linux kernel < 2.6.25 */
+#endif /* !HAVE_IPV4_IS_MULTICAST */
 
 #endif
diff --git a/datapath/linux-2.6/compat-2.6/include/linux/skbuff.h b/datapath/linux-2.6/compat-2.6/include/linux/skbuff.h
index edeba5ae2..d8205c6a2 100644
--- a/datapath/linux-2.6/compat-2.6/include/linux/skbuff.h
+++ b/datapath/linux-2.6/compat-2.6/include/linux/skbuff.h
@@ -149,6 +149,11 @@ static inline unsigned char *skb_network_header(const struct sk_buff *skb)
 	return skb->nh.raw;
 }
 
+static inline void skb_reset_network_header(struct sk_buff *skb)
+{
+	skb->nh.raw = skb->data;
+}
+
 static inline void skb_set_network_header(struct sk_buff *skb, const int offset)
 {
 	skb->nh.raw = skb->data + offset;
diff --git a/datapath/linux-2.6/compat-2.6/include/linux/stddef.h b/datapath/linux-2.6/compat-2.6/include/linux/stddef.h
new file mode 100644
index 000000000..9b68f710f
--- /dev/null
+++ b/datapath/linux-2.6/compat-2.6/include/linux/stddef.h
@@ -0,0 +1,17 @@
+#ifndef __LINUX_STDDEF_WRAPPER_H
+#define __LINUX_STDDEF_WRAPPER_H 1
+
+#include_next <linux/stddef.h>
+
+#ifdef __KERNEL__
+
+#ifndef HAVE_BOOL_TYPE
+enum {
+	false   = 0,
+	true    = 1
+};
+#endif /* !HAVE_BOOL_TYPE */
+
+#endif /* __KERNEL__ */
+
+#endif
diff --git a/datapath/linux-2.6/compat-2.6/include/linux/types.h b/datapath/linux-2.6/compat-2.6/include/linux/types.h
index c1f375eb3..d88baf71c 100644
--- a/datapath/linux-2.6/compat-2.6/include/linux/types.h
+++ b/datapath/linux-2.6/compat-2.6/include/linux/types.h
@@ -11,4 +11,8 @@ typedef __u32 __bitwise __wsum;
 
 #endif /* linux kernel < 2.6.20 */
 
+#ifndef HAVE_BOOL_TYPE
+typedef _Bool bool;
+#endif /* !HAVE_BOOL_TYPE */
+
 #endif
diff --git a/datapath/linux-2.6/compat-2.6/include/net/netlink.h b/datapath/linux-2.6/compat-2.6/include/net/netlink.h
index e0d594d78..2f979fecb 100644
--- a/datapath/linux-2.6/compat-2.6/include/net/netlink.h
+++ b/datapath/linux-2.6/compat-2.6/include/net/netlink.h
@@ -19,4 +19,22 @@ static inline int VERIFY_NUL_STRING(struct nlattr *attr)
 }
 #endif	/* !HAVE_NLA_NUL_STRING */
 
+
+#ifndef NLA_PUT_BE16
+#define NLA_PUT_BE16(skb, attrtype, value) \
+        NLA_PUT_TYPE(skb, __be16, attrtype, value)
+#endif  /* !NLA_PUT_BE16 */
+
+
+#ifndef HAVE_NLA_GET_BE16
+/**
+ * nla_get_be16 - return payload of __be16 attribute
+ * @nla: __be16 netlink attribute
+ */
+static inline __be16 nla_get_be16(struct nlattr *nla)
+{
+        return *(__be16 *) nla_data(nla);
+}
+#endif  /* !HAVE_NLA_GET_BE16 */
+
 #endif /* net/netlink.h */