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56 lines
1.4 KiB
56 lines
1.4 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <linux/kernel.h> |
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#include <net/netlink.h> |
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#include <linux/drbd_genl_api.h> |
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#include "drbd_nla.h" |
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static int drbd_nla_check_mandatory(int maxtype, struct nlattr *nla) |
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{ |
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struct nlattr *head = nla_data(nla); |
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int len = nla_len(nla); |
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int rem; |
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/* |
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* validate_nla (called from nla_parse_nested) ignores attributes |
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* beyond maxtype, and does not understand the DRBD_GENLA_F_MANDATORY flag. |
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* In order to have it validate attributes with the DRBD_GENLA_F_MANDATORY |
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* flag set also, check and remove that flag before calling |
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* nla_parse_nested. |
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*/ |
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nla_for_each_attr(nla, head, len, rem) { |
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if (nla->nla_type & DRBD_GENLA_F_MANDATORY) { |
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nla->nla_type &= ~DRBD_GENLA_F_MANDATORY; |
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if (nla_type(nla) > maxtype) |
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return -EOPNOTSUPP; |
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} |
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} |
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return 0; |
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} |
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int drbd_nla_parse_nested(struct nlattr *tb[], int maxtype, struct nlattr *nla, |
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const struct nla_policy *policy) |
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{ |
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int err; |
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err = drbd_nla_check_mandatory(maxtype, nla); |
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if (!err) |
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err = nla_parse_nested_deprecated(tb, maxtype, nla, policy, |
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NULL); |
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return err; |
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} |
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struct nlattr *drbd_nla_find_nested(int maxtype, struct nlattr *nla, int attrtype) |
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{ |
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int err; |
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/* |
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* If any nested attribute has the DRBD_GENLA_F_MANDATORY flag set and |
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* we don't know about that attribute, reject all the nested |
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* attributes. |
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*/ |
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err = drbd_nla_check_mandatory(maxtype, nla); |
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if (err) |
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return ERR_PTR(err); |
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return nla_find_nested(nla, attrtype); |
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}
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