lib/route: merge branch 'pr/184'

2 files changed, 8 insertions, 0 deletions

diff --git a/lib/msg.c b/lib/msg.c
index 0a523405..4fbd2ca9 100644
--- a/lib/msg.c
+++ b/lib/msg.c
@@ -350,6 +350,8 @@ struct nl_msg *nlmsg_alloc_simple(int nlmsgtype, int flags)
 	struct nlmsghdr nlh = {
 		.nlmsg_type = nlmsgtype,
 		.nlmsg_flags = flags,
+		.nlmsg_seq = NL_AUTO_SEQ,
+		.nlmsg_pid = NL_AUTO_PID,
 	};
 
 	msg = nlmsg_inherit(&nlh);
diff --git a/lib/route/link.c b/lib/route/link.c
index de3c393d..ec19bb51 100644
--- a/lib/route/link.c
+++ b/lib/route/link.c
@@ -1772,6 +1772,10 @@ errout:
  * @note The link name can only be changed if the link has been put
  *       in opertional down state. (~IF_UP)
  *
+ * @note On versions up to 3.4.0, \c NLE_SEQ_MISMATCH would be returned if the
+ *       kernel does not supports \c RTM_NEWLINK. It is advised to ignore the
+ *       error code if you cannot upgrade the library.
+ *
  * @return 0 on success or a negative error code.
  */
 int rtnl_link_change(struct nl_sock *sk, struct rtnl_link *orig,
@@ -1784,6 +1788,7 @@ int rtnl_link_change(struct nl_sock *sk, struct rtnl_link *orig,
 	if (err < 0)
 		return err;
 
+	BUG_ON(msg->nm_nlh->nlmsg_seq != NL_AUTO_SEQ);
 retry:
 	err = nl_send_auto_complete(sk, msg);
 	if (err < 0)
@@ -1792,6 +1797,7 @@ retry:
 	err = wait_for_ack(sk);
 	if (err == -NLE_OPNOTSUPP && msg->nm_nlh->nlmsg_type == RTM_NEWLINK) {
 		msg->nm_nlh->nlmsg_type = RTM_SETLINK;
+		msg->nm_nlh->nlmsg_seq = NL_AUTO_SEQ;
 		goto retry;
 	}