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netlink: Add a macro to set policy message with format string 

Similar to NL_SET_ERR_MSG_FMT, add a macro which sets netlink policy
error message with a format string.

Signed-off-by: Shay Agroskin <shayagr@amazon.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Shay Agroskin 2023-03-23 18:36:04 +02:00 committed by Jakub Kicinski
parent 2bcc74ffd2
commit 3e4d5ba9a3
1 changed files with 22 additions and 0 deletions
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22
include/linux/netlink.h
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@ -161,9 +161,31 @@ struct netlink_ext_ack {
} \
} while (0)
#define NL_SET_ERR_MSG_ATTR_POL_FMT(extack, attr, pol, fmt, args...) do { \
struct netlink_ext_ack *__extack = (extack); \
\
if (!__extack) \
break; \
\
if (snprintf(__extack->_msg_buf, NETLINK_MAX_FMTMSG_LEN, \
"%s" fmt "%s", "", ##args, "") >= \
NETLINK_MAX_FMTMSG_LEN) \
net_warn_ratelimited("%s" fmt "%s", "truncated extack: ", \
##args, "\n"); \
\
do_trace_netlink_extack(__extack->_msg_buf); \
\
__extack->_msg = __extack->_msg_buf; \
__extack->bad_attr = (attr); \
__extack->policy = (pol); \
} while (0)
#define NL_SET_ERR_MSG_ATTR(extack, attr, msg) \
NL_SET_ERR_MSG_ATTR_POL(extack, attr, NULL, msg)
#define NL_SET_ERR_MSG_ATTR_FMT(extack, attr, msg, args...) \
NL_SET_ERR_MSG_ATTR_POL_FMT(extack, attr, NULL, msg, ##args)
#define NL_SET_ERR_ATTR_MISS(extack, nest, type) do { \
struct netlink_ext_ack *__extack = (extack); \
\