From: Joe Stringer <joe@ovn.org>
Date: Thu, 24 Dec 2015 19:32:38 +0000 (-0800)
Subject: compat: Detect and use nf_ipv6_ops->fragment.
X-Git-Url: http://git.cascardo.eti.br/?p=cascardo%2Fovs.git;a=commitdiff_plain;h=e4e04c3b6bf5209592d2a6db96c7905d2bb9133e

compat: Detect and use nf_ipv6_ops->fragment.

Signed-off-by: Joe Stringer <joe@ovn.org>
Acked-by: Pravin B Shelar <pshelar@ovn.org>
---

diff --git a/acinclude.m4 b/acinclude.m4
index f1ee8f873..6b574036a 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -388,6 +388,8 @@ AC_DEFUN([OVS_CHECK_LINUX_COMPAT], [
   OVS_GREP_IFELSE([$KSRC/include/linux/netfilter.h], [nf_register_net_hook])
   OVS_GREP_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hookfn.*nf_hook_ops],
                   [OVS_DEFINE([HAVE_NF_HOOKFN_ARG_OPS])])
+  OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netfilter_ipv6.h], [nf_ipv6_ops],
+                        [fragment], [OVS_DEFINE([HAVE_NF_IPV6_OPS_FRAGMENT])])
 
   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
                   [tmpl_alloc.*conntrack_zone],
diff --git a/datapath/compat.h b/datapath/compat.h
index 3cbd121f2..0e19051fb 100644
--- a/datapath/compat.h
+++ b/datapath/compat.h
@@ -55,8 +55,13 @@ static inline bool skb_encapsulation(struct sk_buff *skb)
 #endif
 
 #ifdef OVS_FRAGMENT_BACKPORT
+#ifdef HAVE_NF_IPV6_OPS_FRAGMENT
+static inline int __init ip6_output_init(void) { return 0; }
+static inline void ip6_output_exit(void) { }
+#else
 int __init ip6_output_init(void);
 void ip6_output_exit(void);
+#endif
 
 static inline int __init compat_init(void)
 {
diff --git a/datapath/linux/compat/include/linux/netfilter_ipv6.h b/datapath/linux/compat/include/linux/netfilter_ipv6.h
index 3026e1fe6..3939e1423 100644
--- a/datapath/linux/compat/include/linux/netfilter_ipv6.h
+++ b/datapath/linux/compat/include/linux/netfilter_ipv6.h
@@ -7,7 +7,7 @@
 #include <net/ip.h>		/* For OVS_VPORT_OUTPUT_PARAMS */
 #include <net/ip6_route.h>
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4,3,0)
+#ifndef HAVE_NF_IPV6_OPS_FRAGMENT
 /* Try to minimise changes required to the actions.c code for calling IPv6
  * fragmentation. We can keep the fragment() API mostly the same, except that
  * the callback parameter needs to be in the form that older kernels accept.
@@ -27,7 +27,7 @@ static inline struct ovs_nf_ipv6_ops *ovs_nf_get_ipv6_ops(void)
 {
 	return &ovs_ipv6_ops;
 }
-#else /* !OVS_FRAGMENT_BACKPORT || !CONFIG_NETFILTER || || !CONFIG_IPV6 */
+#else /* !OVS_FRAGMENT_BACKPORT */
 static inline const struct ovs_nf_ipv6_ops *ovs_nf_get_ipv6_ops(void)
 {
 	return NULL;
@@ -35,5 +35,5 @@ static inline const struct ovs_nf_ipv6_ops *ovs_nf_get_ipv6_ops(void)
 #endif
 #define nf_get_ipv6_ops ovs_nf_get_ipv6_ops
 
-#endif /* < 4.3 */
+#endif /* HAVE_NF_IPV6_OPS_FRAGMENT */
 #endif /* __NETFILTER_IPV6_WRAPPER_H */
diff --git a/datapath/linux/compat/include/net/ip6_route.h b/datapath/linux/compat/include/net/ip6_route.h
index ba7dcc58f..16027e47e 100644
--- a/datapath/linux/compat/include/net/ip6_route.h
+++ b/datapath/linux/compat/include/net/ip6_route.h
@@ -30,18 +30,19 @@ struct dst_entry *rpl_ip6_route_output(struct net *net, const struct sock *sk,
 
 #endif /* 2.6.39 */
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(3,10,0)
+#ifndef HAVE_NF_IPV6_OPS_FRAGMENT
+#ifdef OVS_FRAGMENT_BACKPORT
+int rpl_ip6_fragment(struct sock *sk, struct sk_buff *skb,
+		     int (*output)(OVS_VPORT_OUTPUT_PARAMS));
+#else
 static inline int rpl_ip6_fragment(struct sock *sk, struct sk_buff *skb,
 				   int (*output)(struct sk_buff *))
 {
 	kfree_skb(skb);
 	return -ENOTSUPP;
 }
-#define ip6_fragment rpl_ip6_fragment
-#elif defined(OVS_FRAGMENT_BACKPORT)
-int rpl_ip6_fragment(struct sock *sk, struct sk_buff *skb,
-		     int (*output)(OVS_VPORT_OUTPUT_PARAMS));
-#define ip6_fragment rpl_ip6_fragment
 #endif /* OVS_FRAGMENT_BACKPORT */
+#define ip6_fragment rpl_ip6_fragment
+#endif /* HAVE_NF_IPV6_OPS_FRAGMENT */
 
 #endif /* _NET_IP6_ROUTE_WRAPPER */
diff --git a/datapath/linux/compat/ip6_output.c b/datapath/linux/compat/ip6_output.c
index 5c0cdec4b..c3ef46c4a 100644
--- a/datapath/linux/compat/ip6_output.c
+++ b/datapath/linux/compat/ip6_output.c
@@ -31,7 +31,7 @@
 
 #include <linux/version.h>
 
-#ifdef OVS_FRAGMENT_BACKPORT
+#if !defined(HAVE_NF_IPV6_OPS_FRAGMENT) && defined(OVS_FRAGMENT_BACKPORT)
 
 #include <linux/errno.h>
 #include <linux/kernel.h>