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netlink: add nla_policy_len()

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It calculates the max. length of a Netlink policy, which is usefull
for allocating Netlink buffers roughly the size of the actual
message.

Signed-off-by: Holger Eitzenberger <holger@eitzenberger.org>
Signed-off-by: Patrick McHardy <kaber@trash.net>
This commit is contained in:
Holger Eitzenberger
2009-03-25 18:26:30 +01:00
committed by Patrick McHardy
parent d0dba7255b
commit e487eb99cf
2 changed files with 28 additions and 0 deletions
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include/net/netlink.h
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@@ -230,6 +230,7 @@ extern int nla_validate(struct nlattr *head, int len, int maxtype,
extern int nla_parse(struct nlattr *tb[], int maxtype,
struct nlattr *head, int len,
const struct nla_policy *policy);
extern int nla_policy_len(const struct nla_policy *, int);
extern struct nlattr * nla_find(struct nlattr *head, int len, int attrtype);
extern size_t nla_strlcpy(char *dst, const struct nlattr *nla,
size_t dstsize);