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Date:   Tue, 20 Oct 2020 02:58:17 +0200
From:   Petr Machata <me@...chata.org>
To:     netdev@...r.kernel.org, dsahern@...il.com,
        stephen@...workplumber.org
Cc:     john.fastabend@...il.com, jiri@...dia.com, idosch@...dia.com,
        Petr Machata <me@...chata.org>
Subject: [PATCH iproute2-next 09/15] lib: Extract from devlink/mnlg a helper, mnlu_msg_prepare()

Allocation of a new netlink message with the two usual headers is reusable
with other netlink netlink message types. Extract it into a helper,
mnlu_msg_prepare(). Take the second header as an argument, instead of
passing in parameters to initialize it, and copy it in.

Signed-off-by: Petr Machata <me@...chata.org>
---
 devlink/mnlg.c      | 18 ++++++------------
 include/mnl_utils.h |  2 ++
 lib/mnl_utils.c     | 19 +++++++++++++++++++
 3 files changed, 27 insertions(+), 12 deletions(-)

diff --git a/devlink/mnlg.c b/devlink/mnlg.c
index 9817bbad5e7d..4995b7af06a3 100644
--- a/devlink/mnlg.c
+++ b/devlink/mnlg.c
@@ -14,7 +14,6 @@
 #include <string.h>
 #include <errno.h>
 #include <unistd.h>
-#include <time.h>
 #include <libmnl/libmnl.h>
 #include <linux/genetlink.h>
 
@@ -36,19 +35,14 @@ static struct nlmsghdr *__mnlg_msg_prepare(struct mnlg_socket *nlg, uint8_t cmd,
 					   uint16_t flags, uint32_t id,
 					   uint8_t version)
 {
+	struct genlmsghdr genl = {
+		.cmd = cmd,
+		.version = version,
+	};
 	struct nlmsghdr *nlh;
-	struct genlmsghdr *genl;
-
-	nlh = mnl_nlmsg_put_header(nlg->buf);
-	nlh->nlmsg_type	= id;
-	nlh->nlmsg_flags = flags;
-	nlg->seq = time(NULL);
-	nlh->nlmsg_seq = nlg->seq;
-
-	genl = mnl_nlmsg_put_extra_header(nlh, sizeof(struct genlmsghdr));
-	genl->cmd = cmd;
-	genl->version = version;
 
+	nlh = mnlu_msg_prepare(nlg->buf, id, flags, &genl, sizeof(genl));
+	nlg->seq = nlh->nlmsg_seq;
 	return nlh;
 }
 
diff --git a/include/mnl_utils.h b/include/mnl_utils.h
index 10a064afdfe8..86ce30f49a94 100644
--- a/include/mnl_utils.h
+++ b/include/mnl_utils.h
@@ -3,5 +3,7 @@
 #define __MNL_UTILS_H__ 1
 
 struct mnl_socket *mnlu_socket_open(int bus);
+struct nlmsghdr *mnlu_msg_prepare(void *buf, uint32_t nlmsg_type, uint16_t flags,
+				  void *extra_header, size_t extra_header_size);
 
 #endif /* __MNL_UTILS_H__ */
diff --git a/lib/mnl_utils.c b/lib/mnl_utils.c
index eecb11341651..87df1e81faf5 100644
--- a/lib/mnl_utils.c
+++ b/lib/mnl_utils.c
@@ -8,6 +8,8 @@
  *
  */
 
+#include <string.h>
+#include <time.h>
 #include <libmnl/libmnl.h>
 
 #include "mnl_utils.h"
@@ -33,3 +35,20 @@ err_bind:
 	mnl_socket_close(nl);
 	return NULL;
 }
+
+struct nlmsghdr *mnlu_msg_prepare(void *buf, uint32_t nlmsg_type, uint16_t flags,
+				  void *extra_header, size_t extra_header_size)
+{
+	struct nlmsghdr *nlh;
+	void *eh;
+
+	nlh = mnl_nlmsg_put_header(buf);
+	nlh->nlmsg_type = nlmsg_type;
+	nlh->nlmsg_flags = flags;
+	nlh->nlmsg_seq = time(NULL);
+
+	eh = mnl_nlmsg_put_extra_header(nlh, extra_header_size);
+	memcpy(eh, extra_header, extra_header_size);
+
+	return nlh;
+}
-- 
2.25.1

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