Commit 444be061 authored by Ido Schimmel's avatar Ido Schimmel Committed by David S. Miller
Browse files

drop_monitor: Add a command to query current configuration 



Users should be able to query the current configuration of drop monitor
before they start using it. Add a command to query the existing
configuration which currently consists of alert mode and packet
truncation length.

Signed-off-by: default avatarIdo Schimmel <idosch@mellanox.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 57986617

include/uapi/linux/net_dropmon.h

+2 −0
Original line number Diff line number Diff line
@@ -54,6 +54,8 @@ enum { 
	NET_DM_CMD_START,

	NET_DM_CMD_STOP,

	NET_DM_CMD_PACKET_ALERT,

	NET_DM_CMD_CONFIG_GET,

	NET_DM_CMD_CONFIG_NEW,

	_NET_DM_CMD_MAX,

};

net/core/drop_monitor.c

+48 −0
Original line number Diff line number Diff line
@@ -676,6 +676,50 @@ static int net_dm_cmd_trace(struct sk_buff *skb, 
	return -EOPNOTSUPP;

}



static int net_dm_config_fill(struct sk_buff *msg, struct genl_info *info)

{

	void *hdr;



	hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq,

			  &net_drop_monitor_family, 0, NET_DM_CMD_CONFIG_NEW);

	if (!hdr)

		return -EMSGSIZE;



	if (nla_put_u8(msg, NET_DM_ATTR_ALERT_MODE, net_dm_alert_mode))

		goto nla_put_failure;



	if (nla_put_u32(msg, NET_DM_ATTR_TRUNC_LEN, net_dm_trunc_len))

		goto nla_put_failure;



	genlmsg_end(msg, hdr);



	return 0;



nla_put_failure:

	genlmsg_cancel(msg, hdr);

	return -EMSGSIZE;

}



static int net_dm_cmd_config_get(struct sk_buff *skb, struct genl_info *info)

{

	struct sk_buff *msg;

	int rc;



	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);

	if (!msg)

		return -ENOMEM;



	rc = net_dm_config_fill(msg, info);

	if (rc)

		goto free_msg;



	return genlmsg_reply(msg, info);



free_msg:

	nlmsg_free(msg);

	return rc;

}



static int dropmon_net_event(struct notifier_block *ev_block,

			     unsigned long event, void *ptr)

{
@@ -738,6 +782,10 @@ static const struct genl_ops dropmon_ops[] = { 
		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,

		.doit = net_dm_cmd_trace,

	},

	{

		.cmd = NET_DM_CMD_CONFIG_GET,

		.doit = net_dm_cmd_config_get,

	},

};



static int net_dm_nl_pre_doit(const struct genl_ops *ops,

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