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/*
* Copyright (c) 2007-2012 Nicira Networks.
*
* 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/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 */
static inline void skb_clear_rxhash(struct sk_buff *skb)
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35)
skb->rxhash = 0;
#endif
}
/*
* 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
#endif /* compat.h */
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