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// Copyright The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package procfs
import (
"bufio"
"bytes"
"fmt"
"github.com/prometheus/procfs/internal/util"
)
const nfNetLinkQueueFormat = "%d %d %d %d %d %d %d %d %d"
// NFNetLinkQueue contains general information about netfilter queues found in /proc/net/netfilter/nfnetlink_queue.
type NFNetLinkQueue struct {
// id of the queue
QueueID uint
// pid of process handling the queue
PeerPID uint
// number of packets waiting for a decision
QueueTotal uint
// indicate how userspace receive packets
CopyMode uint
// size of copy
CopyRange uint
// number of items dropped by the kernel because too many packets were waiting a decision.
// It queue_total is superior to queue_max_len (1024 per default) the packets are dropped.
QueueDropped uint
// number of packets dropped by userspace (due to kernel send failure on the netlink socket)
QueueUserDropped uint
// sequence number of packets queued. It gives a correct approximation of the number of queued packets.
SequenceID uint
// internal value (number of entity using the queue)
Use uint
}
// NFNetLinkQueue returns information about current state of netfilter queues.
func (fs FS) NFNetLinkQueue() ([]NFNetLinkQueue, error) {
data, err := util.ReadFileNoStat(fs.proc.Path("net/netfilter/nfnetlink_queue"))
if err != nil {
return nil, err
}
queue := []NFNetLinkQueue{}
if len(data) == 0 {
return queue, nil
}
scanner := bufio.NewScanner(bytes.NewReader(data))
for scanner.Scan() {
line := scanner.Text()
nFNetLinkQueue, err := parseNFNetLinkQueueLine(line)
if err != nil {
return nil, err
}
queue = append(queue, *nFNetLinkQueue)
}
return queue, nil
}
// parseNFNetLinkQueueLine parses each line of the /proc/net/netfilter/nfnetlink_queue file.
func parseNFNetLinkQueueLine(line string) (*NFNetLinkQueue, error) {
nFNetLinkQueue := NFNetLinkQueue{}
_, err := fmt.Sscanf(
line, nfNetLinkQueueFormat,
&nFNetLinkQueue.QueueID, &nFNetLinkQueue.PeerPID, &nFNetLinkQueue.QueueTotal, &nFNetLinkQueue.CopyMode,
&nFNetLinkQueue.CopyRange, &nFNetLinkQueue.QueueDropped, &nFNetLinkQueue.QueueUserDropped, &nFNetLinkQueue.SequenceID, &nFNetLinkQueue.Use,
)
if err != nil {
return nil, err
}
return &nFNetLinkQueue, nil
}
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