rtnetlink: pass netlink message header and portid to rtnl_configure_link()

This patch pass netlink message header and portid to rtnl_configure_link()
All the functions in this call chain need to add the parameters so we can
use them in the last call rtnl_notify(), and notify the userspace about
the new link info if NLM_F_ECHO flag is set.

- rtnl_configure_link()
  - __dev_notify_flags()
    - rtmsg_ifinfo()
      - rtmsg_ifinfo_event()
        - rtmsg_ifinfo_build_skb()
        - rtmsg_ifinfo_send()
	  - rtnl_notify()

Also move __dev_notify_flags() declaration to net/core/dev.h, as Jakub
suggested.

Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Reviewed-by: Guillaume Nault <gnault@redhat.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

2 files changed, 13 insertions, 1 deletions

diff --git a/include/net/netlink.h b/include/net/netlink.h
index 784b4688fc6f..464e2e026f7b 100644
--- a/include/net/netlink.h
+++ b/include/net/netlink.h
@@ -900,6 +900,17 @@ static inline int nlmsg_report(const struct nlmsghdr *nlh)
 }
 
 /**
+ * nlmsg_seq - return the seq number of netlink message
+ * @nlh: netlink message header
+ *
+ * Returns 0 if netlink message is NULL
+ */
+static inline u32 nlmsg_seq(const struct nlmsghdr *nlh)
+{
+	return nlh ? nlh->nlmsg_seq : 0;
+}
+
+/**
  * nlmsg_for_each_attr - iterate over a stream of attributes
  * @pos: loop counter, set to current attribute
  * @nlh: netlink message header
diff --git a/include/net/rtnetlink.h b/include/net/rtnetlink.h
index bf8bb3357825..cd94f65dc2a9 100644
--- a/include/net/rtnetlink.h
+++ b/include/net/rtnetlink.h
@@ -187,7 +187,8 @@ struct net_device *rtnl_create_link(struct net *net, const char *ifname,
 				    struct nlattr *tb[],
 				    struct netlink_ext_ack *extack);
 int rtnl_delete_link(struct net_device *dev);
-int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm);
+int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm,
+			u32 portid, const struct nlmsghdr *nlh);
 
 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len,
 			struct netlink_ext_ack *exterr);