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netlink: add helpers for extack attr presence checking

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Being able to check attribute presence and set extack
if not on one line is handy, add helpers.

Reviewed-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Jakub Kicinski 2022-08-25 20:09:32 -07:00 committed by Paolo Abeni
parent 690252f19f
commit 45dca15759
2 changed files with 18 additions and 0 deletions
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11
include/linux/netlink.h
View File

@ -139,6 +139,17 @@ struct netlink_ext_ack {
} \
} while (0)
#define NL_REQ_ATTR_CHECK(extack, nest, tb, type) ({ \
struct nlattr **__tb = (tb); \
u32 __attr = (type); \
int __retval; \
\
__retval = !__tb[__attr]; \
if (__retval) \
NL_SET_ERR_ATTR_MISS((extack), (nest), __attr); \
__retval; \
})
static inline void nl_set_extack_cookie_u64(struct netlink_ext_ack *extack,
u64 cookie)
{

7
include/net/genetlink.h
View File

@ -110,6 +110,13 @@ static inline void genl_info_net_set(struct genl_info *info, struct net *net)
#define GENL_SET_ERR_MSG(info, msg) NL_SET_ERR_MSG((info)->extack, msg)
/* Report that a root attribute is missing */
#define GENL_REQ_ATTR_CHECK(info, attr) ({ \
struct genl_info *__info = (info); \
\
NL_REQ_ATTR_CHECK(__info->extack, NULL, __info->attrs, (attr)); \
})
enum genl_validate_flags {
GENL_DONT_VALIDATE_STRICT = BIT(0),
GENL_DONT_VALIDATE_DUMP = BIT(1),