datapath: add skb mark matching and set action

[cascardo/ovs.git] / datapath / compat.h

diff --git a/datapath/compat.h b/datapath/compat.h
index 84a222f..3b8d577 100644 (file)
--- a/datapath/compat.h
+++ b/datapath/compat.h
@@ -1,25 +1,117 @@
 /*
- * Copyright (c) 2009 Nicira Networks.
- * Distributed under the terms of the GNU GPL version 2.
+ * Copyright (c) 2007-2012 Nicira, Inc.
  *
- * Significant portions of this file may be copied from parts of the Linux
- * kernel, by Linus Torvalds and others.
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
  */
 
 #ifndef COMPAT_H
 #define COMPAT_H 1
 
-#include <linux/version.h>
+#include <linux/netlink.h>
+
+#ifndef HAVE_NLA_NUL_STRING
+static inline int CHECK_NUL_STRING(struct nlattr *attr, int maxlen)
+{
+       char *s;
+       int len;
+       if (!attr)
+               return 0;
+
+       len = nla_len(attr);
+       if (len >= maxlen)
+               return -EINVAL;
+
+       s = nla_data(attr);
+       if (s[len - 1] != '\0')
+               return -EINVAL;
+
+       return 0;
+}
+#else
+static inline int CHECK_NUL_STRING(struct nlattr *attr, int maxlen)
+{
+       return 0;
+}
+#endif  /* !HAVE_NLA_NUL_STRING */
 
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
+static inline void skb_clear_rxhash(struct sk_buff *skb)
+{
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35)
+       skb->rxhash = 0;
+#endif
+}
 
-#include "compat26.h"
+/*
+ * Enforces, mutual exclusion with the Linux bridge module, by declaring and
+ * exporting br_should_route_hook.  Because the bridge module also exports the
+ * same symbol, the module loader will refuse to load both modules at the same
+ * time (e.g. "bridge: exports duplicate symbol br_should_route_hook (owned by
+ * openvswitch)").
+ *
+ * Before Linux 2.6.36, Open vSwitch cannot safely coexist with the Linux
+ * bridge module, so openvswitch uses this macro in those versions.  In
+ * Linux 2.6.36 and later, Open vSwitch can coexist with the bridge module,
+ * but it makes no sense to load both bridge and brcompat, so brcompat uses
+ * this macro in those versions.
+ *
+ * The use of "typeof" here avoids the need to track changes in the type of
+ * br_should_route_hook over various kernel versions.
+ */
+#define BRIDGE_MUTUAL_EXCLUSION                                        \
+       typeof(br_should_route_hook) br_should_route_hook;      \
+       EXPORT_SYMBOL(br_should_route_hook)
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,32)
+#define GENL_SOCK(net) (genl_sock)
+#define SET_NETNSOK
 #else
+#define GENL_SOCK(net) ((net)->genl_sock)
+#define SET_NETNSOK    .netnsok = true,
+#endif
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,20)
+#ifdef CONFIG_NETFILTER
+static inline u32 skb_get_mark(struct sk_buff *skb)
+{
+       return skb->nfmark;
+}
 
-#include "compat24.h"
+static inline void skb_set_mark(struct sk_buff *skb, u32 mark)
+{
+       skb->nfmark = mark;
+}
+#else /* CONFIG_NETFILTER */
+static inline u32 skb_get_mark(struct sk_buff *skb)
+{
+       return 0;
+}
 
+static inline void skb_set_mark(struct sk_buff *skb, u32 mark)
+{
+}
 #endif
+#else /* before 2.6.20 */
+static inline u32 skb_get_mark(struct sk_buff *skb)
+{
+       return skb->mark;
+}
 
+static inline void skb_set_mark(struct sk_buff *skb, u32 mark)
+{
+       skb->mark = mark;
+}
+#endif /* after 2.6.20 */
 
 #endif /* compat.h */