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drop_monitor: Add a command to query current configuration

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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: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ido Schimmel 2019-08-11 10:35:53 +03:00 committed by David S. Miller
parent 57986617a7
commit 444be061d0
2 changed files with 50 additions and 0 deletions
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2
include/uapi/linux/net_dropmon.h
View File

@ -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,
};

48
net/core/drop_monitor.c
View File

@ -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,