[RFC PATCH net-next 1/3] netlink: add support for formatted extack messages

[<ecree@xilinx.com>]

From: Edward Cree <ecree.xilinx@gmail.com>

Include an 80-byte buffer in struct netlink_ext_ack that can be used
 for scnprintf()ed messages.  This does mean that the resulting string
 can't be enumerated, translated etc. in the way NL_SET_ERR_MSG() was
 designed to allow.

Signed-off-by: Edward Cree <ecree.xilinx@gmail.com>
---
 include/linux/netlink.h | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/include/linux/netlink.h b/include/linux/netlink.h
index d51e041d2242..bfab9dbd64fa 100644
--- a/include/linux/netlink.h
+++ b/include/linux/netlink.h
@@ -64,6 +64,7 @@ netlink_kernel_create(struct net *net, int unit, struct netlink_kernel_cfg *cfg)
 
 /* this can be increased when necessary - don't expose to userland */
 #define NETLINK_MAX_COOKIE_LEN	20
+#define NETLINK_MAX_FMTMSG_LEN	80
 
 /**
  * struct netlink_ext_ack - netlink extended ACK report struct
@@ -75,6 +76,8 @@ netlink_kernel_create(struct net *net, int unit, struct netlink_kernel_cfg *cfg)
  * @miss_nest: nest missing an attribute (%NULL if missing top level attr)
  * @cookie: cookie data to return to userspace (for success)
  * @cookie_len: actual cookie data length
+ * @_msg_buf: output buffer for formatted message strings - don't access
+ *	directly, use %NL_SET_ERR_MSG_FMT
  */
 struct netlink_ext_ack {
 	const char *_msg;
@@ -84,13 +87,13 @@ struct netlink_ext_ack {
 	u16 miss_type;
 	u8 cookie[NETLINK_MAX_COOKIE_LEN];
 	u8 cookie_len;
+	char _msg_buf[NETLINK_MAX_FMTMSG_LEN];
 };
 
 /* Always use this macro, this allows later putting the
  * message into a separate section or such for things
  * like translation or listing all possible messages.
- * Currently string formatting is not supported (due
- * to the lack of an output buffer.)
+ * If string formatting is needed use NL_SET_ERR_MSG_FMT.
  */
 #define NL_SET_ERR_MSG(extack, msg) do {		\
 	static const char __msg[] = msg;		\
@@ -102,9 +105,23 @@ struct netlink_ext_ack {
 		__extack->_msg = __msg;			\
 } while (0)
 
+#define NL_SET_ERR_MSG_FMT(extack, fmt, args...) do {		\
+	struct netlink_ext_ack *__extack = (extack);		\
+								\
+	scnprintf(__extack->_msg_buf, NETLINK_MAX_FMTMSG_LEN,	\
+		  (fmt), ##args);				\
+	do_trace_netlink_extack(__extack->_msg_buf);		\
+								\
+	if (__extack)						\
+		__extack->_msg = __extack->_msg_buf;		\
+} while (0)
+
 #define NL_SET_ERR_MSG_MOD(extack, msg)			\
 	NL_SET_ERR_MSG((extack), KBUILD_MODNAME ": " msg)
 
+#define NL_SET_ERR_MSG_FMT_MOD(extack, fmt, args...)	\
+	NL_SET_ERR_MSG_FMT((extack), KBUILD_MODNAME ": " fmt, ##args)
+
 #define NL_SET_BAD_ATTR_POLICY(extack, attr, pol) do {	\
 	if ((extack)) {					\
 		(extack)->bad_attr = (attr);		\