Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) #include <net/netlink.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) #include <linux/drbd_genl_api.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) #include "drbd_nla.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) static int drbd_nla_check_mandatory(int maxtype, struct nlattr *nla)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) 	struct nlattr *head = nla_data(nla);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) 	int len = nla_len(nla);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) 	int rem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) 	 * validate_nla (called from nla_parse_nested) ignores attributes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 	 * beyond maxtype, and does not understand the DRBD_GENLA_F_MANDATORY flag.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 	 * In order to have it validate attributes with the DRBD_GENLA_F_MANDATORY
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 	 * flag set also, check and remove that flag before calling
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 	 * nla_parse_nested.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 	nla_for_each_attr(nla, head, len, rem) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 		if (nla->nla_type & DRBD_GENLA_F_MANDATORY) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 			nla->nla_type &= ~DRBD_GENLA_F_MANDATORY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 			if (nla_type(nla) > maxtype)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 				return -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) int drbd_nla_parse_nested(struct nlattr *tb[], int maxtype, struct nlattr *nla,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 			  const struct nla_policy *policy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 	err = drbd_nla_check_mandatory(maxtype, nla);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	if (!err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 		err = nla_parse_nested_deprecated(tb, maxtype, nla, policy,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 						  NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) struct nlattr *drbd_nla_find_nested(int maxtype, struct nlattr *nla, int attrtype)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	 * If any nested attribute has the DRBD_GENLA_F_MANDATORY flag set and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	 * we don't know about that attribute, reject all the nested
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 	 * attributes.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 	err = drbd_nla_check_mandatory(maxtype, nla);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 		return ERR_PTR(err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 	return nla_find_nested(nla, attrtype);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) }