tipc: convert legacy nl link stat reset to nl compat

Convert TIPC_CMD_RESET_LINK_STATS to compat doit.

Signed-off-by: Richard Alpe <[e-mail]>
Reviewed-by: Erik Hugne <[e-mail]>
Reviewed-by: Ying Xue <[e-mail]>
Reviewed-by: Jon Maloy <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/tipc/config.c

···
 		rep_tlv_buf = tipc_node_get_nodes(net, req_tlv_area,
 						  req_tlv_space);
 		break;
-	case TIPC_CMD_RESET_LINK_STATS:
-		rep_tlv_buf = tipc_link_cmd_reset_stats(net, req_tlv_area,
-							req_tlv_space);
-		break;
 	case TIPC_CMD_SHOW_NAME_TABLE:
 		rep_tlv_buf = tipc_nametbl_get(net, req_tlv_area,
 					       req_tlv_space);

net/tipc/link.c

···
 	l_ptr->stats.recv_info = l_ptr->next_in_no;
 }
 
-struct sk_buff *tipc_link_cmd_reset_stats(struct net *net,
-					  const void *req_tlv_area,
-					  int req_tlv_space)
-{
-	char *link_name;
-	struct tipc_link *l_ptr;
-	struct tipc_node *node;
-	unsigned int bearer_id;
-
-	if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_LINK_NAME))
-		return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
-
-	link_name = (char *)TLV_DATA(req_tlv_area);
-	if (!strcmp(link_name, tipc_bclink_name)) {
-		if (tipc_bclink_reset_stats(net))
-			return tipc_cfg_reply_error_string("link not found");
-		return tipc_cfg_reply_none();
-	}
-	node = tipc_link_find_owner(net, link_name, &bearer_id);
-	if (!node)
-		return tipc_cfg_reply_error_string("link not found");
-
-	tipc_node_lock(node);
-	l_ptr = node->links[bearer_id];
-	if (!l_ptr) {
-		tipc_node_unlock(node);
-		return tipc_cfg_reply_error_string("link not found");
-	}
-	link_reset_statistics(l_ptr);
-	tipc_node_unlock(node);
-	return tipc_cfg_reply_none();
-}
-
 static void link_print(struct tipc_link *l_ptr, const char *str)
 {
 	struct tipc_net *tn = net_generic(l_ptr->owner->net, tipc_net_id);
···
 	struct tipc_link *link;
 	struct tipc_node *node;
 	struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
-	struct net *net = genl_info_net(info);
+	struct net *net = sock_net(skb->sk);
 
 	if (!info->attrs[TIPC_NLA_LINK])
 		return -EINVAL;

net/tipc/link.h

···
 int tipc_link_is_up(struct tipc_link *l_ptr);
 int tipc_link_is_active(struct tipc_link *l_ptr);
 void tipc_link_purge_queues(struct tipc_link *l_ptr);
-struct sk_buff *tipc_link_cmd_reset_stats(struct net *net,
-					  const void *req_tlv_area,
-					  int req_tlv_space);
 void tipc_link_reset_all(struct tipc_node *node);
 void tipc_link_reset(struct tipc_link *l_ptr);
 void tipc_link_reset_list(struct net *net, unsigned int bearer_id);

net/tipc/netlink_compat.c

···
 	return 0;
 }
 
+static int tipc_nl_compat_link_reset_stats(struct sk_buff *skb,
+					   struct tipc_nl_compat_msg *msg)
+{
+	char *name;
+	struct nlattr *link;
+
+	name = (char *)TLV_DATA(msg->req);
+
+	link = nla_nest_start(skb, TIPC_NLA_LINK);
+	if (!link)
+		return -EMSGSIZE;
+
+	if (nla_put_string(skb, TIPC_NLA_LINK_NAME, name))
+		return -EMSGSIZE;
+
+	nla_nest_end(skb, link);
+
+	return 0;
+}
+
 static int tipc_nl_compat_handle(struct tipc_nl_compat_msg *msg)
 {
 	struct tipc_nl_compat_cmd_dump dump;
···
 		msg->req_type =  TIPC_TLV_LINK_CONFIG;
 		doit.doit = tipc_nl_link_set;
 		doit.transcode = tipc_nl_compat_link_set;
+		return tipc_nl_compat_doit(&doit, msg);
+	case TIPC_CMD_RESET_LINK_STATS:
+		msg->req_type = TIPC_TLV_LINK_NAME;
+		doit.doit = tipc_nl_link_reset_stats;
+		doit.transcode = tipc_nl_compat_link_reset_stats;
 		return tipc_nl_compat_doit(&doit, msg);
 	}
 
···
 	case TIPC_CMD_SET_LINK_TOL:
 	case TIPC_CMD_SET_LINK_PRI:
 	case TIPC_CMD_SET_LINK_WINDOW:
+	case TIPC_CMD_RESET_LINK_STATS:
 		return tipc_nl_compat_recv(skb, info);
 	}