mirror of
https://github.com/kubenetworks/kubevpn.git
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fix: fix dns on linux (#336)
* fix: fix dns on linux * feat: detect run in Github action or not to setup DNS
This commit is contained in:
naison
537
vendor/github.com/tailscale/netlink/conntrack_linux.go
generated
vendored
Normal file
537
vendor/github.com/tailscale/netlink/conntrack_linux.go
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vendored
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@@ -0,0 +1,537 @@
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package netlink
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import (
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"bytes"
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"encoding/binary"
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"errors"
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"fmt"
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"net"
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"time"
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"github.com/vishvananda/netlink/nl"
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"golang.org/x/sys/unix"
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)
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// ConntrackTableType Conntrack table for the netlink operation
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type ConntrackTableType uint8
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const (
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// ConntrackTable Conntrack table
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// https://github.com/torvalds/linux/blob/master/include/uapi/linux/netfilter/nfnetlink.h -> #define NFNL_SUBSYS_CTNETLINK 1
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ConntrackTable = 1
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// ConntrackExpectTable Conntrack expect table
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// https://github.com/torvalds/linux/blob/master/include/uapi/linux/netfilter/nfnetlink.h -> #define NFNL_SUBSYS_CTNETLINK_EXP 2
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ConntrackExpectTable = 2
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)
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const (
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// backward compatibility with golang 1.6 which does not have io.SeekCurrent
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seekCurrent = 1
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)
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// InetFamily Family type
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type InetFamily uint8
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// -L [table] [options] List conntrack or expectation table
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// -G [table] parameters Get conntrack or expectation
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// -I [table] parameters Create a conntrack or expectation
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// -U [table] parameters Update a conntrack
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// -E [table] [options] Show events
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// -C [table] Show counter
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// -S Show statistics
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// ConntrackTableList returns the flow list of a table of a specific family
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// conntrack -L [table] [options] List conntrack or expectation table
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func ConntrackTableList(table ConntrackTableType, family InetFamily) ([]*ConntrackFlow, error) {
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return pkgHandle.ConntrackTableList(table, family)
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}
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// ConntrackTableFlush flushes all the flows of a specified table
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// conntrack -F [table] Flush table
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// The flush operation applies to all the family types
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func ConntrackTableFlush(table ConntrackTableType) error {
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return pkgHandle.ConntrackTableFlush(table)
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}
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// ConntrackDeleteFilter deletes entries on the specified table on the base of the filter
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// conntrack -D [table] parameters Delete conntrack or expectation
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func ConntrackDeleteFilter(table ConntrackTableType, family InetFamily, filter CustomConntrackFilter) (uint, error) {
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return pkgHandle.ConntrackDeleteFilter(table, family, filter)
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}
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// ConntrackTableList returns the flow list of a table of a specific family using the netlink handle passed
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// conntrack -L [table] [options] List conntrack or expectation table
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func (h *Handle) ConntrackTableList(table ConntrackTableType, family InetFamily) ([]*ConntrackFlow, error) {
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res, err := h.dumpConntrackTable(table, family)
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if err != nil {
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return nil, err
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}
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// Deserialize all the flows
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var result []*ConntrackFlow
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for _, dataRaw := range res {
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result = append(result, parseRawData(dataRaw))
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}
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return result, nil
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}
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// ConntrackTableFlush flushes all the flows of a specified table using the netlink handle passed
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// conntrack -F [table] Flush table
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// The flush operation applies to all the family types
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func (h *Handle) ConntrackTableFlush(table ConntrackTableType) error {
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req := h.newConntrackRequest(table, unix.AF_INET, nl.IPCTNL_MSG_CT_DELETE, unix.NLM_F_ACK)
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_, err := req.Execute(unix.NETLINK_NETFILTER, 0)
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return err
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}
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// ConntrackDeleteFilter deletes entries on the specified table on the base of the filter using the netlink handle passed
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// conntrack -D [table] parameters Delete conntrack or expectation
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func (h *Handle) ConntrackDeleteFilter(table ConntrackTableType, family InetFamily, filter CustomConntrackFilter) (uint, error) {
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res, err := h.dumpConntrackTable(table, family)
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if err != nil {
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return 0, err
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}
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var matched uint
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for _, dataRaw := range res {
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flow := parseRawData(dataRaw)
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if match := filter.MatchConntrackFlow(flow); match {
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req2 := h.newConntrackRequest(table, family, nl.IPCTNL_MSG_CT_DELETE, unix.NLM_F_ACK)
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// skip the first 4 byte that are the netfilter header, the newConntrackRequest is adding it already
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req2.AddRawData(dataRaw[4:])
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req2.Execute(unix.NETLINK_NETFILTER, 0)
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matched++
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}
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}
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return matched, nil
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}
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func (h *Handle) newConntrackRequest(table ConntrackTableType, family InetFamily, operation, flags int) *nl.NetlinkRequest {
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// Create the Netlink request object
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req := h.newNetlinkRequest((int(table)<<8)|operation, flags)
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// Add the netfilter header
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msg := &nl.Nfgenmsg{
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NfgenFamily: uint8(family),
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Version: nl.NFNETLINK_V0,
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ResId: 0,
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}
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req.AddData(msg)
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return req
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}
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func (h *Handle) dumpConntrackTable(table ConntrackTableType, family InetFamily) ([][]byte, error) {
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req := h.newConntrackRequest(table, family, nl.IPCTNL_MSG_CT_GET, unix.NLM_F_DUMP)
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return req.Execute(unix.NETLINK_NETFILTER, 0)
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}
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// The full conntrack flow structure is very complicated and can be found in the file:
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// http://git.netfilter.org/libnetfilter_conntrack/tree/include/internal/object.h
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// For the time being, the structure below allows to parse and extract the base information of a flow
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type ipTuple struct {
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Bytes uint64
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DstIP net.IP
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DstPort uint16
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Packets uint64
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Protocol uint8
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SrcIP net.IP
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SrcPort uint16
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}
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type ConntrackFlow struct {
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FamilyType uint8
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Forward ipTuple
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Reverse ipTuple
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Mark uint32
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TimeStart uint64
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TimeStop uint64
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TimeOut uint32
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}
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func (s *ConntrackFlow) String() string {
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// conntrack cmd output:
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// udp 17 src=127.0.0.1 dst=127.0.0.1 sport=4001 dport=1234 packets=5 bytes=532 [UNREPLIED] src=127.0.0.1 dst=127.0.0.1 sport=1234 dport=4001 packets=10 bytes=1078 mark=0
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// start=2019-07-26 01:26:21.557800506 +0000 UTC stop=1970-01-01 00:00:00 +0000 UTC timeout=30(sec)
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start := time.Unix(0, int64(s.TimeStart))
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stop := time.Unix(0, int64(s.TimeStop))
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timeout := int32(s.TimeOut)
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return fmt.Sprintf("%s\t%d src=%s dst=%s sport=%d dport=%d packets=%d bytes=%d\tsrc=%s dst=%s sport=%d dport=%d packets=%d bytes=%d mark=0x%x start=%v stop=%v timeout=%d(sec)",
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nl.L4ProtoMap[s.Forward.Protocol], s.Forward.Protocol,
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s.Forward.SrcIP.String(), s.Forward.DstIP.String(), s.Forward.SrcPort, s.Forward.DstPort, s.Forward.Packets, s.Forward.Bytes,
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s.Reverse.SrcIP.String(), s.Reverse.DstIP.String(), s.Reverse.SrcPort, s.Reverse.DstPort, s.Reverse.Packets, s.Reverse.Bytes,
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s.Mark, start, stop, timeout)
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}
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// This method parse the ip tuple structure
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// The message structure is the following:
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// <len, [CTA_IP_V4_SRC|CTA_IP_V6_SRC], 16 bytes for the IP>
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// <len, [CTA_IP_V4_DST|CTA_IP_V6_DST], 16 bytes for the IP>
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// <len, NLA_F_NESTED|nl.CTA_TUPLE_PROTO, 1 byte for the protocol, 3 bytes of padding>
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// <len, CTA_PROTO_SRC_PORT, 2 bytes for the source port, 2 bytes of padding>
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// <len, CTA_PROTO_DST_PORT, 2 bytes for the source port, 2 bytes of padding>
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func parseIpTuple(reader *bytes.Reader, tpl *ipTuple) uint8 {
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for i := 0; i < 2; i++ {
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_, t, _, v := parseNfAttrTLV(reader)
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switch t {
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case nl.CTA_IP_V4_SRC, nl.CTA_IP_V6_SRC:
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tpl.SrcIP = v
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case nl.CTA_IP_V4_DST, nl.CTA_IP_V6_DST:
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tpl.DstIP = v
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}
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}
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// Get total length of nested protocol-specific info.
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_, _, protoInfoTotalLen := parseNfAttrTL(reader)
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_, t, l, v := parseNfAttrTLV(reader)
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// Track the number of bytes read.
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protoInfoBytesRead := uint16(nl.SizeofNfattr) + l
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if t == nl.CTA_PROTO_NUM {
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tpl.Protocol = uint8(v[0])
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}
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// We only parse TCP & UDP headers. Skip the others.
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if tpl.Protocol != 6 && tpl.Protocol != 17 {
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// skip the rest
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bytesRemaining := protoInfoTotalLen - protoInfoBytesRead
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reader.Seek(int64(bytesRemaining), seekCurrent)
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return tpl.Protocol
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}
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// Skip 3 bytes of padding
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reader.Seek(3, seekCurrent)
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protoInfoBytesRead += 3
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for i := 0; i < 2; i++ {
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_, t, _ := parseNfAttrTL(reader)
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protoInfoBytesRead += uint16(nl.SizeofNfattr)
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switch t {
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case nl.CTA_PROTO_SRC_PORT:
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parseBERaw16(reader, &tpl.SrcPort)
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protoInfoBytesRead += 2
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case nl.CTA_PROTO_DST_PORT:
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parseBERaw16(reader, &tpl.DstPort)
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protoInfoBytesRead += 2
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}
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// Skip 2 bytes of padding
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reader.Seek(2, seekCurrent)
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protoInfoBytesRead += 2
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}
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// Skip any remaining/unknown parts of the message
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bytesRemaining := protoInfoTotalLen - protoInfoBytesRead
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reader.Seek(int64(bytesRemaining), seekCurrent)
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return tpl.Protocol
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}
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func parseNfAttrTLV(r *bytes.Reader) (isNested bool, attrType, len uint16, value []byte) {
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isNested, attrType, len = parseNfAttrTL(r)
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value = make([]byte, len)
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binary.Read(r, binary.BigEndian, &value)
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return isNested, attrType, len, value
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}
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func parseNfAttrTL(r *bytes.Reader) (isNested bool, attrType, len uint16) {
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binary.Read(r, nl.NativeEndian(), &len)
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len -= nl.SizeofNfattr
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binary.Read(r, nl.NativeEndian(), &attrType)
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isNested = (attrType & nl.NLA_F_NESTED) == nl.NLA_F_NESTED
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attrType = attrType & (nl.NLA_F_NESTED - 1)
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return isNested, attrType, len
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}
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func skipNfAttrValue(r *bytes.Reader, len uint16) {
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len = (len + nl.NLA_ALIGNTO - 1) & ^(nl.NLA_ALIGNTO - 1)
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r.Seek(int64(len), seekCurrent)
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}
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func parseBERaw16(r *bytes.Reader, v *uint16) {
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binary.Read(r, binary.BigEndian, v)
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}
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func parseBERaw32(r *bytes.Reader, v *uint32) {
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binary.Read(r, binary.BigEndian, v)
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}
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func parseBERaw64(r *bytes.Reader, v *uint64) {
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binary.Read(r, binary.BigEndian, v)
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}
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func parseByteAndPacketCounters(r *bytes.Reader) (bytes, packets uint64) {
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for i := 0; i < 2; i++ {
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switch _, t, _ := parseNfAttrTL(r); t {
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case nl.CTA_COUNTERS_BYTES:
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parseBERaw64(r, &bytes)
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case nl.CTA_COUNTERS_PACKETS:
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parseBERaw64(r, &packets)
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default:
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return
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}
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}
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return
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}
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// when the flow is alive, only the timestamp_start is returned in structure
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func parseTimeStamp(r *bytes.Reader, readSize uint16) (tstart, tstop uint64) {
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var numTimeStamps int
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oneItem := nl.SizeofNfattr + 8 // 4 bytes attr header + 8 bytes timestamp
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if readSize == uint16(oneItem) {
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numTimeStamps = 1
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} else if readSize == 2*uint16(oneItem) {
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numTimeStamps = 2
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} else {
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return
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}
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for i := 0; i < numTimeStamps; i++ {
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switch _, t, _ := parseNfAttrTL(r); t {
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case nl.CTA_TIMESTAMP_START:
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parseBERaw64(r, &tstart)
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case nl.CTA_TIMESTAMP_STOP:
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parseBERaw64(r, &tstop)
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default:
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return
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}
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}
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return
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}
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func parseTimeOut(r *bytes.Reader) (ttimeout uint32) {
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parseBERaw32(r, &ttimeout)
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return
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}
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func parseConnectionMark(r *bytes.Reader) (mark uint32) {
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parseBERaw32(r, &mark)
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return
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}
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func parseRawData(data []byte) *ConntrackFlow {
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s := &ConntrackFlow{}
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// First there is the Nfgenmsg header
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// consume only the family field
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reader := bytes.NewReader(data)
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binary.Read(reader, nl.NativeEndian(), &s.FamilyType)
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// skip rest of the Netfilter header
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reader.Seek(3, seekCurrent)
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// The message structure is the following:
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// <len, NLA_F_NESTED|CTA_TUPLE_ORIG> 4 bytes
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// <len, NLA_F_NESTED|CTA_TUPLE_IP> 4 bytes
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// flow information of the forward flow
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// <len, NLA_F_NESTED|CTA_TUPLE_REPLY> 4 bytes
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// <len, NLA_F_NESTED|CTA_TUPLE_IP> 4 bytes
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// flow information of the reverse flow
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for reader.Len() > 0 {
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if nested, t, l := parseNfAttrTL(reader); nested {
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||||
switch t {
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||||
case nl.CTA_TUPLE_ORIG:
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if nested, t, l = parseNfAttrTL(reader); nested && t == nl.CTA_TUPLE_IP {
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parseIpTuple(reader, &s.Forward)
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}
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case nl.CTA_TUPLE_REPLY:
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if nested, t, l = parseNfAttrTL(reader); nested && t == nl.CTA_TUPLE_IP {
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||||
parseIpTuple(reader, &s.Reverse)
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||||
} else {
|
||||
// Header not recognized skip it
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skipNfAttrValue(reader, l)
|
||||
}
|
||||
case nl.CTA_COUNTERS_ORIG:
|
||||
s.Forward.Bytes, s.Forward.Packets = parseByteAndPacketCounters(reader)
|
||||
case nl.CTA_COUNTERS_REPLY:
|
||||
s.Reverse.Bytes, s.Reverse.Packets = parseByteAndPacketCounters(reader)
|
||||
case nl.CTA_TIMESTAMP:
|
||||
s.TimeStart, s.TimeStop = parseTimeStamp(reader, l)
|
||||
case nl.CTA_PROTOINFO:
|
||||
skipNfAttrValue(reader, l)
|
||||
default:
|
||||
skipNfAttrValue(reader, l)
|
||||
}
|
||||
} else {
|
||||
switch t {
|
||||
case nl.CTA_MARK:
|
||||
s.Mark = parseConnectionMark(reader)
|
||||
case nl.CTA_TIMEOUT:
|
||||
s.TimeOut = parseTimeOut(reader)
|
||||
case nl.CTA_STATUS, nl.CTA_USE, nl.CTA_ID:
|
||||
skipNfAttrValue(reader, l)
|
||||
default:
|
||||
skipNfAttrValue(reader, l)
|
||||
}
|
||||
}
|
||||
}
|
||||
return s
|
||||
}
|
||||
|
||||
// Conntrack parameters and options:
|
||||
// -n, --src-nat ip source NAT ip
|
||||
// -g, --dst-nat ip destination NAT ip
|
||||
// -j, --any-nat ip source or destination NAT ip
|
||||
// -m, --mark mark Set mark
|
||||
// -c, --secmark secmark Set selinux secmark
|
||||
// -e, --event-mask eventmask Event mask, eg. NEW,DESTROY
|
||||
// -z, --zero Zero counters while listing
|
||||
// -o, --output type[,...] Output format, eg. xml
|
||||
// -l, --label label[,...] conntrack labels
|
||||
|
||||
// Common parameters and options:
|
||||
// -s, --src, --orig-src ip Source address from original direction
|
||||
// -d, --dst, --orig-dst ip Destination address from original direction
|
||||
// -r, --reply-src ip Source address from reply direction
|
||||
// -q, --reply-dst ip Destination address from reply direction
|
||||
// -p, --protonum proto Layer 4 Protocol, eg. 'tcp'
|
||||
// -f, --family proto Layer 3 Protocol, eg. 'ipv6'
|
||||
// -t, --timeout timeout Set timeout
|
||||
// -u, --status status Set status, eg. ASSURED
|
||||
// -w, --zone value Set conntrack zone
|
||||
// --orig-zone value Set zone for original direction
|
||||
// --reply-zone value Set zone for reply direction
|
||||
// -b, --buffer-size Netlink socket buffer size
|
||||
// --mask-src ip Source mask address
|
||||
// --mask-dst ip Destination mask address
|
||||
|
||||
// Layer 4 Protocol common parameters and options:
|
||||
// TCP, UDP, SCTP, UDPLite and DCCP
|
||||
// --sport, --orig-port-src port Source port in original direction
|
||||
// --dport, --orig-port-dst port Destination port in original direction
|
||||
|
||||
// Filter types
|
||||
type ConntrackFilterType uint8
|
||||
|
||||
const (
|
||||
ConntrackOrigSrcIP = iota // -orig-src ip Source address from original direction
|
||||
ConntrackOrigDstIP // -orig-dst ip Destination address from original direction
|
||||
ConntrackReplySrcIP // --reply-src ip Reply Source IP
|
||||
ConntrackReplyDstIP // --reply-dst ip Reply Destination IP
|
||||
ConntrackReplyAnyIP // Match source or destination reply IP
|
||||
ConntrackOrigSrcPort // --orig-port-src port Source port in original direction
|
||||
ConntrackOrigDstPort // --orig-port-dst port Destination port in original direction
|
||||
ConntrackNatSrcIP = ConntrackReplySrcIP // deprecated use instead ConntrackReplySrcIP
|
||||
ConntrackNatDstIP = ConntrackReplyDstIP // deprecated use instead ConntrackReplyDstIP
|
||||
ConntrackNatAnyIP = ConntrackReplyAnyIP // deprecated use instead ConntrackReplyAnyIP
|
||||
)
|
||||
|
||||
type CustomConntrackFilter interface {
|
||||
// MatchConntrackFlow applies the filter to the flow and returns true if the flow matches
|
||||
// the filter or false otherwise
|
||||
MatchConntrackFlow(flow *ConntrackFlow) bool
|
||||
}
|
||||
|
||||
type ConntrackFilter struct {
|
||||
ipNetFilter map[ConntrackFilterType]*net.IPNet
|
||||
portFilter map[ConntrackFilterType]uint16
|
||||
protoFilter uint8
|
||||
}
|
||||
|
||||
// AddIPNet adds a IP subnet to the conntrack filter
|
||||
func (f *ConntrackFilter) AddIPNet(tp ConntrackFilterType, ipNet *net.IPNet) error {
|
||||
if ipNet == nil {
|
||||
return fmt.Errorf("Filter attribute empty")
|
||||
}
|
||||
if f.ipNetFilter == nil {
|
||||
f.ipNetFilter = make(map[ConntrackFilterType]*net.IPNet)
|
||||
}
|
||||
if _, ok := f.ipNetFilter[tp]; ok {
|
||||
return errors.New("Filter attribute already present")
|
||||
}
|
||||
f.ipNetFilter[tp] = ipNet
|
||||
return nil
|
||||
}
|
||||
|
||||
// AddIP adds an IP to the conntrack filter
|
||||
func (f *ConntrackFilter) AddIP(tp ConntrackFilterType, ip net.IP) error {
|
||||
if ip == nil {
|
||||
return fmt.Errorf("Filter attribute empty")
|
||||
}
|
||||
return f.AddIPNet(tp, NewIPNet(ip))
|
||||
}
|
||||
|
||||
// AddPort adds a Port to the conntrack filter if the Layer 4 protocol allows it
|
||||
func (f *ConntrackFilter) AddPort(tp ConntrackFilterType, port uint16) error {
|
||||
switch f.protoFilter {
|
||||
// TCP, UDP, DCCP, SCTP, UDPLite
|
||||
case 6, 17, 33, 132, 136:
|
||||
default:
|
||||
return fmt.Errorf("Filter attribute not available without a valid Layer 4 protocol: %d", f.protoFilter)
|
||||
}
|
||||
|
||||
if f.portFilter == nil {
|
||||
f.portFilter = make(map[ConntrackFilterType]uint16)
|
||||
}
|
||||
if _, ok := f.portFilter[tp]; ok {
|
||||
return errors.New("Filter attribute already present")
|
||||
}
|
||||
f.portFilter[tp] = port
|
||||
return nil
|
||||
}
|
||||
|
||||
// AddProtocol adds the Layer 4 protocol to the conntrack filter
|
||||
func (f *ConntrackFilter) AddProtocol(proto uint8) error {
|
||||
if f.protoFilter != 0 {
|
||||
return errors.New("Filter attribute already present")
|
||||
}
|
||||
f.protoFilter = proto
|
||||
return nil
|
||||
}
|
||||
|
||||
// MatchConntrackFlow applies the filter to the flow and returns true if the flow matches the filter
|
||||
// false otherwise
|
||||
func (f *ConntrackFilter) MatchConntrackFlow(flow *ConntrackFlow) bool {
|
||||
if len(f.ipNetFilter) == 0 && len(f.portFilter) == 0 && f.protoFilter == 0 {
|
||||
// empty filter always not match
|
||||
return false
|
||||
}
|
||||
|
||||
// -p, --protonum proto Layer 4 Protocol, eg. 'tcp'
|
||||
if f.protoFilter != 0 && flow.Forward.Protocol != f.protoFilter {
|
||||
// different Layer 4 protocol always not match
|
||||
return false
|
||||
}
|
||||
|
||||
match := true
|
||||
|
||||
// IP conntrack filter
|
||||
if len(f.ipNetFilter) > 0 {
|
||||
// -orig-src ip Source address from original direction
|
||||
if elem, found := f.ipNetFilter[ConntrackOrigSrcIP]; found {
|
||||
match = match && elem.Contains(flow.Forward.SrcIP)
|
||||
}
|
||||
|
||||
// -orig-dst ip Destination address from original direction
|
||||
if elem, found := f.ipNetFilter[ConntrackOrigDstIP]; match && found {
|
||||
match = match && elem.Contains(flow.Forward.DstIP)
|
||||
}
|
||||
|
||||
// -src-nat ip Source NAT ip
|
||||
if elem, found := f.ipNetFilter[ConntrackReplySrcIP]; match && found {
|
||||
match = match && elem.Contains(flow.Reverse.SrcIP)
|
||||
}
|
||||
|
||||
// -dst-nat ip Destination NAT ip
|
||||
if elem, found := f.ipNetFilter[ConntrackReplyDstIP]; match && found {
|
||||
match = match && elem.Contains(flow.Reverse.DstIP)
|
||||
}
|
||||
|
||||
// Match source or destination reply IP
|
||||
if elem, found := f.ipNetFilter[ConntrackReplyAnyIP]; match && found {
|
||||
match = match && (elem.Contains(flow.Reverse.SrcIP) || elem.Contains(flow.Reverse.DstIP))
|
||||
}
|
||||
}
|
||||
|
||||
// Layer 4 Port filter
|
||||
if len(f.portFilter) > 0 {
|
||||
// -orig-port-src port Source port from original direction
|
||||
if elem, found := f.portFilter[ConntrackOrigSrcPort]; match && found {
|
||||
match = match && elem == flow.Forward.SrcPort
|
||||
}
|
||||
|
||||
// -orig-port-dst port Destination port from original direction
|
||||
if elem, found := f.portFilter[ConntrackOrigDstPort]; match && found {
|
||||
match = match && elem == flow.Forward.DstPort
|
||||
}
|
||||
}
|
||||
|
||||
return match
|
||||
}
|
||||
|
||||
var _ CustomConntrackFilter = (*ConntrackFilter)(nil)
|
||||
Reference in New Issue
Block a user