netlink: add netlink_dump_control structure for netlink_dump_start()

Davem considers that the argument list of this interface is getting
out of control. This patch tries to address this issue following
his proposal:

struct netlink_dump_control c = { .dump = dump, .done = done, ... };

netlink_dump_start(..., &c);

Suggested by David S. Miller.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 12 insertions, 6 deletions

diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c
index fcf2818..8d25a1c 100644
--- a/net/ipv4/inet_diag.c
+++ b/net/ipv4/inet_diag.c
@@ -960,9 +960,12 @@ static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
 			    inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
 				return -EINVAL;
 		}
-
-		return netlink_dump_start(sock_diag_nlsk, skb, nlh,
-					  inet_diag_dump_compat, NULL, 0);
+		{
+			struct netlink_dump_control c = {
+				.dump = inet_diag_dump_compat,
+			};
+			return netlink_dump_start(sock_diag_nlsk, skb, nlh, &c);
+		}
 	}
 
 	return inet_diag_get_exact_compat(skb, nlh);
@@ -985,9 +988,12 @@ static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
 			    inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
 				return -EINVAL;
 		}
-
-		return netlink_dump_start(sock_diag_nlsk, skb, h,
-					  inet_diag_dump, NULL, 0);
+		{
+			struct netlink_dump_control c = {
+				.dump = inet_diag_dump,
+			};
+			return netlink_dump_start(sock_diag_nlsk, skb, h, &c);
+		}
 	}
 
 	return inet_diag_get_exact(skb, h, (struct inet_diag_req_v2 *)NLMSG_DATA(h));