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authorJakub Kicinski <kuba@kernel.org>2022-08-25 20:09:32 -0700
committerPaolo Abeni <pabeni@redhat.com>2022-08-30 12:20:43 +0200
commit45dca15759643806660e9285e6af8a1ba3c76c82 (patch)
tree8103714a8db796c0ebe105ecb4fc9fd99c60bade /include/linux/netlink.h
parent690252f19f0e486abb8590b3a7a03d4e065d93d4 (diff)
netlink: add helpers for extack attr presence checking
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>
Diffstat (limited to 'include/linux/netlink.h')
-rw-r--r--include/linux/netlink.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/netlink.h b/include/linux/netlink.h
index 1619221c415c..d51e041d2242 100644
--- a/include/linux/netlink.h
+++ b/include/linux/netlink.h
@@ -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)
{