linux-kernel - [RFC PATCH net-next v3 01/21] netlink: introduce nla_put

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Message-Id: <b874a527531020f62a25391334e83c3c78ea2a90.1550513384.git.mkubecek@suse.cz>
Date:   Mon, 18 Feb 2019 19:21:29 +0100 (CET)
From:   Michal Kubecek <mkubecek@...e.cz>
To:     netdev@...r.kernel.org
Cc:     David Miller <davem@...emloft.net>, Andrew Lunn <andrew@...n.ch>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Jiri Pirko <jiri@...nulli.us>, linux-kernel@...r.kernel.org
Subject: [RFC PATCH net-next v3 01/21] netlink: introduce nla_put_bitfield32()

Similar to other data types, this helper puts NLA_BITFIELD32 attribute into
a netlink message. It takes separate value and selector arguments, if there
is a struct nla_bitfield32 already, one can use nla_put().

Signed-off-by: Michal Kubecek <mkubecek@...e.cz>
---
 include/net/netlink.h | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/include/net/netlink.h b/include/net/netlink.h
index 23f27b0b3cef..bc0497076bec 100644
--- a/include/net/netlink.h
+++ b/include/net/netlink.h
@@ -1211,6 +1211,21 @@ static inline int nla_put_in6_addr(struct sk_buff *skb, int attrtype,
 	return nla_put(skb, attrtype, sizeof(*addr), addr);
 }
 
+/**
+ * nla_put_bitfield32 - Add a bitfield32 value/selector attribute to
+ * a socket buffer
+ * @skb: socket buffer to add attribute to
+ * @value: 32-bit value bitmap
+ * @selector: 32-bit selector bitmap
+ */
+static inline int nla_put_bitfield32(struct sk_buff *skb, int attrtype,
+				     u32 value, u32 selector)
+{
+	struct nla_bitfield32 tmp = { .value = value, .selector = selector };
+
+	return nla_put(skb, attrtype, sizeof(tmp), &tmp);
+}
+
 /**
  * nla_get_u32 - return payload of u32 attribute
  * @nla: u32 netlink attribute
-- 
2.20.1