netdev - [PATCH] genl: ctrl: print op -> policy idx mapping

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Message-Id: <20201002102609.224150-1-johannes@sipsolutions.net>
Date:   Fri,  2 Oct 2020 12:26:09 +0200
From:   Johannes Berg <johannes@...solutions.net>
To:     netdev@...r.kernel.org
Cc:     Jakub Kicinski <kuba@...nel.org>, David Ahern <dsahern@...il.com>
Subject: [PATCH] genl: ctrl: print op -> policy idx mapping

Newer kernels can dump per-op policies, so print out the new
mapping attribute to indicate which op has which policy.

Signed-off-by: Johannes Berg <johannes@...solutions.net>
---
 genl/ctrl.c                    | 10 ++++++++++
 include/uapi/linux/genetlink.h |  2 ++
 2 files changed, 12 insertions(+)

diff --git a/genl/ctrl.c b/genl/ctrl.c
index 68099fe97f1a..c62212b40fa3 100644
--- a/genl/ctrl.c
+++ b/genl/ctrl.c
@@ -162,6 +162,16 @@ static int print_ctrl(struct rtnl_ctrl_data *ctrl,
 		__u32 *ma = RTA_DATA(tb[CTRL_ATTR_MAXATTR]);
 		fprintf(fp, " max attribs: %d ",*ma);
 	}
+	if (tb[CTRL_ATTR_OP_POLICY]) {
+		const struct rtattr *pos;
+
+		rtattr_for_each_nested(pos, tb[CTRL_ATTR_OP_POLICY]) {
+			__u32 *v = RTA_DATA(pos);
+
+			fprintf(fp, " op %d has policy %d",
+				pos->rta_type, *v);
+		}
+	}
 	if (tb[CTRL_ATTR_POLICY])
 		nl_print_policy(tb[CTRL_ATTR_POLICY], fp);
 
diff --git a/include/uapi/linux/genetlink.h b/include/uapi/linux/genetlink.h
index 7c6c390c48ee..adb59b9fb9a3 100644
--- a/include/uapi/linux/genetlink.h
+++ b/include/uapi/linux/genetlink.h
@@ -64,6 +64,8 @@ enum {
 	CTRL_ATTR_OPS,
 	CTRL_ATTR_MCAST_GROUPS,
 	CTRL_ATTR_POLICY,
+	CTRL_ATTR_OP,
+	CTRL_ATTR_OP_POLICY,
 	__CTRL_ATTR_MAX,
 };
 
-- 
2.26.2