tipc: convert legacy nl link prop set to nl compat

Convert setting of link proprieties to compat doit calls.

Commands converted in this patch:
TIPC_CMD_SET_LINK_TOL
TIPC_CMD_SET_LINK_PRI
TIPC_CMD_SET_LINK_WINDOW

Signed-off-by: Richard Alpe <richard.alpe@ericsson.com>
Reviewed-by: Erik Hugne <erik.hugne@ericsson.com>
Reviewed-by: Ying Xue <ying.xue@windriver.com>
Reviewed-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/tipc/config.c

@@ -226,12 +226,6 @@ struct sk_buff *tipc_cfg_do_cmd(struct net *net, u32 orig_node, u16 cmd,
 	case TIPC_CMD_SHOW_STATS:
 		rep_tlv_buf = tipc_show_stats();
 		break;
-	case TIPC_CMD_SET_LINK_TOL:
-	case TIPC_CMD_SET_LINK_PRI:
-	case TIPC_CMD_SET_LINK_WINDOW:
-		rep_tlv_buf = tipc_link_cmd_config(net, req_tlv_area,
-						   req_tlv_space, cmd);
-		break;
 	case TIPC_CMD_SET_NODE_ADDR:
 		rep_tlv_buf = cfg_set_own_addr(net);
 		break;

net/tipc/link.c

@@ -1958,150 +1958,6 @@ static struct tipc_node *tipc_link_find_owner(struct net *net,
 	return found_node;
 }
 
-/**
- * link_value_is_valid -- validate proposed link tolerance/priority/window
- *
- * @cmd: value type (TIPC_CMD_SET_LINK_*)
- * @new_value: the new value
- *
- * Returns 1 if value is within range, 0 if not.
- */
-static int link_value_is_valid(u16 cmd, u32 new_value)
-{
-	switch (cmd) {
-	case TIPC_CMD_SET_LINK_TOL:
-		return (new_value >= TIPC_MIN_LINK_TOL) &&
-			(new_value <= TIPC_MAX_LINK_TOL);
-	case TIPC_CMD_SET_LINK_PRI:
-		return (new_value <= TIPC_MAX_LINK_PRI);
-	case TIPC_CMD_SET_LINK_WINDOW:
-		return (new_value >= TIPC_MIN_LINK_WIN) &&
-			(new_value <= TIPC_MAX_LINK_WIN);
-	}
-	return 0;
-}
-
-/**
- * link_cmd_set_value - change priority/tolerance/window for link/bearer/media
- * @net: the applicable net namespace
- * @name: ptr to link, bearer, or media name
- * @new_value: new value of link, bearer, or media setting
- * @cmd: which link, bearer, or media attribute to set (TIPC_CMD_SET_LINK_*)
- *
- * Caller must hold RTNL lock to ensure link/bearer/media is not deleted.
- *
- * Returns 0 if value updated and negative value on error.
- */
-static int link_cmd_set_value(struct net *net, const char *name, u32 new_value,
-			      u16 cmd)
-{
-	struct tipc_node *node;
-	struct tipc_link *l_ptr;
-	struct tipc_bearer *b_ptr;
-	struct tipc_media *m_ptr;
-	int bearer_id;
-	int res = 0;
-
-	node = tipc_link_find_owner(net, name, &bearer_id);
-	if (node) {
-		tipc_node_lock(node);
-		l_ptr = node->links[bearer_id];
-
-		if (l_ptr) {
-			switch (cmd) {
-			case TIPC_CMD_SET_LINK_TOL:
-				link_set_supervision_props(l_ptr, new_value);
-				tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0,
-						     new_value, 0, 0);
-				break;
-			case TIPC_CMD_SET_LINK_PRI:
-				l_ptr->priority = new_value;
-				tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0,
-						     0, new_value, 0);
-				break;
-			case TIPC_CMD_SET_LINK_WINDOW:
-				tipc_link_set_queue_limits(l_ptr, new_value);
-				break;
-			default:
-				res = -EINVAL;
-				break;
-			}
-		}
-		tipc_node_unlock(node);
-		return res;
-	}
-
-	b_ptr = tipc_bearer_find(net, name);
-	if (b_ptr) {
-		switch (cmd) {
-		case TIPC_CMD_SET_LINK_TOL:
-			b_ptr->tolerance = new_value;
-			break;
-		case TIPC_CMD_SET_LINK_PRI:
-			b_ptr->priority = new_value;
-			break;
-		case TIPC_CMD_SET_LINK_WINDOW:
-			b_ptr->window = new_value;
-			break;
-		default:
-			res = -EINVAL;
-			break;
-		}
-		return res;
-	}
-
-	m_ptr = tipc_media_find(name);
-	if (!m_ptr)
-		return -ENODEV;
-	switch (cmd) {
-	case TIPC_CMD_SET_LINK_TOL:
-		m_ptr->tolerance = new_value;
-		break;
-	case TIPC_CMD_SET_LINK_PRI:
-		m_ptr->priority = new_value;
-		break;
-	case TIPC_CMD_SET_LINK_WINDOW:
-		m_ptr->window = new_value;
-		break;
-	default:
-		res = -EINVAL;
-		break;
-	}
-	return res;
-}
-
-struct sk_buff *tipc_link_cmd_config(struct net *net, const void *req_tlv_area,
-				     int req_tlv_space, u16 cmd)
-{
-	struct tipc_link_config *args;
-	u32 new_value;
-	int res;
-
-	if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_LINK_CONFIG))
-		return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
-
-	args = (struct tipc_link_config *)TLV_DATA(req_tlv_area);
-	new_value = ntohl(args->value);
-
-	if (!link_value_is_valid(cmd, new_value))
-		return tipc_cfg_reply_error_string(
-			"cannot change, value invalid");
-
-	if (!strcmp(args->name, tipc_bclink_name)) {
-		if ((cmd == TIPC_CMD_SET_LINK_WINDOW) &&
-		    (tipc_bclink_set_queue_limits(net, new_value) == 0))
-			return tipc_cfg_reply_none();
-		return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
-						   " (cannot change setting on broadcast link)");
-	}
-
-	res = link_cmd_set_value(net, args->name, new_value, cmd);
-	if (res)
-		return tipc_cfg_reply_error_string("cannot change link setting");
-
-	return tipc_cfg_reply_none();
-}
-
 /**
  * link_reset_statistics - reset link statistics
  * @l_ptr: pointer to link
@@ -2216,7 +2072,7 @@ int tipc_nl_link_set(struct sk_buff *skb, struct genl_info *info)
 	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

@@ -215,8 +215,6 @@ void tipc_link_reset_fragments(struct tipc_link *l_ptr);
 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_config(struct net *net, const void *req_tlv_area,
-				     int req_tlv_space, u16 cmd);
 struct sk_buff *tipc_link_cmd_reset_stats(struct net *net,
 					  const void *req_tlv_area,
 					  int req_tlv_space);

net/tipc/netlink_compat.c

@@ -569,6 +569,43 @@ static int tipc_nl_compat_link_dump(struct tipc_nl_compat_msg *msg,
 			    &link_info, sizeof(link_info));
 }
 
+static int tipc_nl_compat_link_set(struct sk_buff *skb,
+				   struct tipc_nl_compat_msg *msg)
+{
+	struct nlattr *link;
+	struct nlattr *prop;
+	struct tipc_link_config *lc;
+
+	lc = (struct tipc_link_config *)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, lc->name))
+		return -EMSGSIZE;
+
+	prop = nla_nest_start(skb, TIPC_NLA_LINK_PROP);
+	if (!prop)
+		return -EMSGSIZE;
+
+	if (msg->cmd == TIPC_CMD_SET_LINK_PRI) {
+		if (nla_put_u32(skb, TIPC_NLA_PROP_PRIO, ntohl(lc->value)))
+			return -EMSGSIZE;
+	} else if (msg->cmd == TIPC_CMD_SET_LINK_TOL) {
+		if (nla_put_u32(skb, TIPC_NLA_PROP_TOL, ntohl(lc->value)))
+			return -EMSGSIZE;
+	} else if (msg->cmd == TIPC_CMD_SET_LINK_WINDOW) {
+		if (nla_put_u32(skb, TIPC_NLA_PROP_WIN, ntohl(lc->value)))
+			return -EMSGSIZE;
+	}
+
+	nla_nest_end(skb, prop);
+	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;
@@ -606,6 +643,13 @@ static int tipc_nl_compat_handle(struct tipc_nl_compat_msg *msg)
 		dump.dumpit = tipc_nl_link_dump;
 		dump.format = tipc_nl_compat_link_dump;
 		return tipc_nl_compat_dumpit(&dump, msg);
+	case TIPC_CMD_SET_LINK_TOL:
+	case TIPC_CMD_SET_LINK_PRI:
+	case TIPC_CMD_SET_LINK_WINDOW:
+		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);
 	}
 
 	return -EOPNOTSUPP;
@@ -707,6 +751,9 @@ static int tipc_nl_compat_tmp_wrap(struct sk_buff *skb, struct genl_info *info)
 	case TIPC_CMD_DISABLE_BEARER:
 	case TIPC_CMD_SHOW_LINK_STATS:
 	case TIPC_CMD_GET_LINKS:
+	case TIPC_CMD_SET_LINK_TOL:
+	case TIPC_CMD_SET_LINK_PRI:
+	case TIPC_CMD_SET_LINK_WINDOW:
 		return tipc_nl_compat_recv(skb, info);
 	}