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Most necessary compatibility code is simply backported versions of kernel functions from newer kernels. These belong in the compat directory, where they can be transparently picked up when necessary. However, in some situations there is code that is different depending on the kernel version but is always needed in some form. Here it is desirable to segregate the code but it does not really belong in the compat directory because it does not exist in upstream kernels. This moves those functions to a compat file, which makes the meaning clear and prevents problems when Open vSwitch is integrated into other projects. Signed-off-by: Jesse Gross <jesse@nicira.com> Acked-by: Ben Pfaff <blp@nicira.com>
40 lines
717 B
C
40 lines
717 B
C
/*
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* Copyright (c) 2011 Nicira Networks.
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* Distributed under the terms of the GNU GPL version 2.
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*
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* Significant portions of this file may be copied from parts of the Linux
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* kernel, by Linus Torvalds and others.
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*/
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#ifndef COMPAT_H
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#define COMPAT_H 1
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#include <linux/netlink.h>
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#ifndef HAVE_NLA_NUL_STRING
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static inline int CHECK_NUL_STRING(struct nlattr *attr, int maxlen)
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{
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char *s;
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int len;
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if (!attr)
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return 0;
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len = nla_len(attr);
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if (len >= maxlen)
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return -EINVAL;
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s = nla_data(attr);
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if (s[len - 1] != '\0')
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return -EINVAL;
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return 0;
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}
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#else
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static inline int CHECK_NUL_STRING(struct nlattr *attr, int maxlen)
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{
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return 0;
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}
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#endif /* !HAVE_NLA_NUL_STRING */
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#endif /* compat.h */
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