Re: [B.A.T.M.A.N.] [RFC v4 04/19] batman-adv: Prepare framework for vlan genl config

Jiri Pirko
2019-01-21T09:44:30Z

Sat, Jan 19, 2019 at 04:56:11PM CET, sven@narfation.org wrote:

[...]

>+/**
>+ * batadv_netlink_vlan_put() - Fill message with vlan attributes
>+ * @msg: Netlink message to dump into
>+ * @bat_priv: the bat priv with all the soft interface information
>+ * @vlan: vlan which was modified
>+ * @cmd: type of message to generate
>+ * @portid: Port making netlink request
>+ * @seq: sequence number for message
>+ * @flags: Additional flags for message
>+ *
>+ * Return: 0 on success or negative error number in case of failure
>+ */
>+static int batadv_netlink_vlan_put(struct sk_buff *msg,
>+ struct batadv_priv *bat_priv,
>+ struct batadv_softif_vlan *vlan,
>+ enum batadv_nl_commands cmd,
>+ u32 portid, u32 seq, int flags)
>+{
>+ void *hdr;
>+
>+ hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, flags, cmd);
>+ if (!hdr)
>+ return -ENOBUFS;
>+
>+ if (nla_put_u32(msg, BATADV_ATTR_MESH_IFINDEX,
>+ bat_priv->soft_iface->ifindex))
>+ goto nla_put_failure;
>+
>+ if (nla_put_u32(msg, BATADV_ATTR_VLANID, vlan->vid & VLAN_VID_MASK))
>+ goto nla_put_failure;
>+
>+ genlmsg_end(msg, hdr);
>+ return 0;
>+
>+nla_put_failure:
>+ genlmsg_cancel(msg, hdr);
>+ return -EMSGSIZE;
>+}
>+
>+/**
>+ * batadv_netlink_notify_vlan() - send vlan attributes to listener
>+ * @bat_priv: the bat priv with all the soft interface information
>+ * @vlan: vlan which was modified
>+ *
>+ * Return: 0 on success, < 0 on error
>+ */
>+static int batadv_netlink_notify_vlan(struct batadv_priv *bat_priv,
>+ struct batadv_softif_vlan *vlan)
>+{
>+ struct sk_buff *msg;
>+ int ret;
>+
>+ msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
>+ if (!msg)
>+ return -ENOMEM;
>+
>+ ret = batadv_netlink_vlan_put(msg, bat_priv, vlan,
>+ BATADV_CMD_SET_VLAN, 0, 0, 0);
>+ if (ret < 0) {
>+ nlmsg_free(msg);
>+ return ret;
>+ }
>+
>+ genlmsg_multicast_netns(&batadv_netlink_family,
>+ dev_net(bat_priv->soft_iface), msg, 0,
>+ BATADV_NL_MCGRP_CONFIG, GFP_KERNEL);
>+
>+ return 0;
>+}
>+
>+/**
>+ * batadv_netlink_get_vlan() - Get vlan attributes
>+ * @skb: Netlink message with request data
>+ * @info: receiver information
>+ *
>+ * Return: 0 on success or negative error number in case of failure
>+ */
>+static int batadv_netlink_get_vlan(struct sk_buff *skb, struct genl_info *info)
>+{
>+ struct batadv_softif_vlan *vlan = info->user_ptr[1];
>+ struct batadv_priv *bat_priv = info->user_ptr[0];
>+ struct sk_buff *msg;
>+ int ret;
>+
>+ msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
>+ if (!msg)
>+ return -ENOMEM;
>+
>+ ret = batadv_netlink_vlan_put(msg, bat_priv, vlan, BATADV_CMD_GET_VLAN,
>+ info->snd_portid, info->snd_seq, 0);

This get/put naming here looks a bit confusing. Better to use "fill" for
example:
ret = batadv_netlink_vlan_fill(msg, bat_priv, vlan, BATADV_CMD_GET_VLAN,
info->snd_portid, info->snd_seq, 0);

>+ if (ret < 0) {

Just "if (!ret)" would do. Same in the rest of the code.

>+ nlmsg_free(msg);
>+ return ret;
>+ }
>+
>+ ret = genlmsg_reply(msg, info);
>+
>+ return ret;
>+}
>+ …