55 lines
1.4 KiB
C
55 lines
1.4 KiB
C
#include <linux/kernel.h>
|
|
#include <net/netlink.h>
|
|
#include <linux/drbd_genl_api.h>
|
|
#include "drbd_nla.h"
|
|
|
|
static int drbd_nla_check_mandatory(int maxtype, struct nlattr *nla)
|
|
{
|
|
struct nlattr *head = nla_data(nla);
|
|
int len = nla_len(nla);
|
|
int rem;
|
|
|
|
/*
|
|
* validate_nla (called from nla_parse_nested) ignores attributes
|
|
* beyond maxtype, and does not understand the DRBD_GENLA_F_MANDATORY flag.
|
|
* In order to have it validate attributes with the DRBD_GENLA_F_MANDATORY
|
|
* flag set also, check and remove that flag before calling
|
|
* nla_parse_nested.
|
|
*/
|
|
|
|
nla_for_each_attr(nla, head, len, rem) {
|
|
if (nla->nla_type & DRBD_GENLA_F_MANDATORY) {
|
|
nla->nla_type &= ~DRBD_GENLA_F_MANDATORY;
|
|
if (nla_type(nla) > maxtype)
|
|
return -EOPNOTSUPP;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int drbd_nla_parse_nested(struct nlattr *tb[], int maxtype, struct nlattr *nla,
|
|
const struct nla_policy *policy)
|
|
{
|
|
int err;
|
|
|
|
err = drbd_nla_check_mandatory(maxtype, nla);
|
|
if (!err)
|
|
err = nla_parse_nested(tb, maxtype, nla, policy, NULL);
|
|
|
|
return err;
|
|
}
|
|
|
|
struct nlattr *drbd_nla_find_nested(int maxtype, struct nlattr *nla, int attrtype)
|
|
{
|
|
int err;
|
|
/*
|
|
* If any nested attribute has the DRBD_GENLA_F_MANDATORY flag set and
|
|
* we don't know about that attribute, reject all the nested
|
|
* attributes.
|
|
*/
|
|
err = drbd_nla_check_mandatory(maxtype, nla);
|
|
if (err)
|
|
return ERR_PTR(err);
|
|
return nla_find_nested(nla, attrtype);
|
|
}
|