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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
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@@ -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)
{