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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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fceb6435e8
Pass the new extended ACK reporting struct to all of the generic netlink parsing functions. For now, pass NULL in almost all callers (except for some in the core.) Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
54 lines
1.4 KiB
C
54 lines
1.4 KiB
C
#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(tb, maxtype, nla, policy, 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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