net: rtnetlink: plumb extended ack to doit function

Add netlink_ext_ack arg to rtnl_doit_func. Pass extack arg to nlmsg_parse
for doit functions that call it directly.

This is the first step to using extended error reporting in rtnetlink.
>From here individual subsystems can be updated to set netlink_ext_ack as
needed.

Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 2 deletions

diff --git a/net/dcb/dcbnl.c b/net/dcb/dcbnl.c
index 3f5a5f710576..93106120f987 100644
--- a/net/dcb/dcbnl.c
+++ b/net/dcb/dcbnl.c
@@ -1696,7 +1696,8 @@ static const struct reply_func reply_funcs[DCB_CMD_MAX+1] = {
         [DCB_CMD_CEE_GET]       = { RTM_GETDCB, dcbnl_cee_get },
 };
 
-static int dcb_doit(struct sk_buff *skb, struct nlmsghdr *nlh)
+static int dcb_doit(struct sk_buff *skb, struct nlmsghdr *nlh,
+                    struct netlink_ext_ack *extack)
 {
         struct net *net = sock_net(skb->sk);
         struct net_device *netdev;
@@ -1712,7 +1713,7 @@ static int dcb_doit(struct sk_buff *skb, struct nlmsghdr *nlh)
                 return -EPERM;
 
         ret = nlmsg_parse(nlh, sizeof(*dcb), tb, DCB_ATTR_MAX,
-                          dcbnl_rtnl_policy, NULL);
+                          dcbnl_rtnl_policy, extack);
         if (ret < 0)
                 return ret;