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tsnet,wgengine: fix src to primary Tailscale IP for TCP dials

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Ensure that the src address for a connection is one of the primary
addresses assigned by Tailscale. Not, for example, a virtual IP address.

Updates #14667

Signed-off-by: Fran Bull <fran@tailscale.com>
This commit is contained in:
Fran Bull 2025-03-05 10:25:30 -08:00 committed by franbull
parent 8f0080c7a4
commit 5ebc135397
3 changed files with 51 additions and 2 deletions
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1
cmd/k8s-operator/depaware.txt
View File

@ -904,6 +904,7 @@ tailscale.com/cmd/k8s-operator dependencies: (generated by github.com/tailscale/
tailscale.com/tstime/rate from tailscale.com/derp+
tailscale.com/tsweb/varz from tailscale.com/util/usermetric
tailscale.com/types/appctype from tailscale.com/ipn/ipnlocal
tailscale.com/types/bools from tailscale.com/tsnet
tailscale.com/types/dnstype from tailscale.com/ipn/ipnlocal+
tailscale.com/types/empty from tailscale.com/ipn+
tailscale.com/types/ipproto from tailscale.com/net/flowtrack+

9
tsnet/tsnet.go
View File

@ -49,6 +49,7 @@ import (
"tailscale.com/net/socks5"
"tailscale.com/net/tsdial"
"tailscale.com/tsd"
"tailscale.com/types/bools"
"tailscale.com/types/logger"
"tailscale.com/types/logid"
"tailscale.com/types/nettype"
@ -601,7 +602,9 @@ func (s *Server) start() (reterr error) {
// Note: don't just return ns.DialContextTCP or we'll return
// *gonet.TCPConn(nil) instead of a nil interface which trips up
// callers.
tcpConn, err := ns.DialContextTCP(ctx, dst)
v4, v6 := s.TailscaleIPs()
src := bools.IfElse(dst.Addr().Is6(), v6, v4)
tcpConn, err := ns.DialContextTCPWithBind(ctx, src, dst)
if err != nil {
return nil, err
}
@ -611,7 +614,9 @@ func (s *Server) start() (reterr error) {
// Note: don't just return ns.DialContextUDP or we'll return
// *gonet.UDPConn(nil) instead of a nil interface which trips up
// callers.
udpConn, err := ns.DialContextUDP(ctx, dst)
v4, v6 := s.TailscaleIPs()
src := bools.IfElse(dst.Addr().Is6(), v6, v4)
udpConn, err := ns.DialContextUDPWithBind(ctx, src, dst)
if err != nil {
return nil, err
}

43
wgengine/netstack/netstack.go
View File

@ -843,6 +843,27 @@ func (ns *Impl) DialContextTCP(ctx context.Context, ipp netip.AddrPort) (*gonet.
return gonet.DialContextTCP(ctx, ns.ipstack, remoteAddress, ipType)
}
// DialContextTCPWithBind creates a new gonet.TCPConn connected to the specified
// remoteAddress with its local address bound to localAddr on an available port.
func (ns *Impl) DialContextTCPWithBind(ctx context.Context, localAddr netip.Addr, remoteAddr netip.AddrPort) (*gonet.TCPConn, error) {
remoteAddress := tcpip.FullAddress{
NIC: nicID,
Addr: tcpip.AddrFromSlice(remoteAddr.Addr().AsSlice()),
Port: remoteAddr.Port(),
}
localAddress := tcpip.FullAddress{
NIC: nicID,
Addr: tcpip.AddrFromSlice(localAddr.AsSlice()),
}
var ipType tcpip.NetworkProtocolNumber
if remoteAddr.Addr().Is4() {
ipType = ipv4.ProtocolNumber
} else {
ipType = ipv6.ProtocolNumber
}
return gonet.DialTCPWithBind(ctx, ns.ipstack, localAddress, remoteAddress, ipType)
}
func (ns *Impl) DialContextUDP(ctx context.Context, ipp netip.AddrPort) (*gonet.UDPConn, error) {
remoteAddress := &tcpip.FullAddress{
NIC: nicID,
@ -859,6 +880,28 @@ func (ns *Impl) DialContextUDP(ctx context.Context, ipp netip.AddrPort) (*gonet.
return gonet.DialUDP(ns.ipstack, nil, remoteAddress, ipType)
}
// DialContextUDPWithBind creates a new gonet.UDPConn. Connected to remoteAddr.
// With its local address bound to localAddr on an available port.
func (ns *Impl) DialContextUDPWithBind(ctx context.Context, localAddr netip.Addr, remoteAddr netip.AddrPort) (*gonet.UDPConn, error) {
remoteAddress := &tcpip.FullAddress{
NIC: nicID,
Addr: tcpip.AddrFromSlice(remoteAddr.Addr().AsSlice()),
Port: remoteAddr.Port(),
}
localAddress := &tcpip.FullAddress{
NIC: nicID,
Addr: tcpip.AddrFromSlice(localAddr.AsSlice()),
}
var ipType tcpip.NetworkProtocolNumber
if remoteAddr.Addr().Is4() {
ipType = ipv4.ProtocolNumber
} else {
ipType = ipv6.ProtocolNumber
}
return gonet.DialUDP(ns.ipstack, localAddress, remoteAddress, ipType)
}
// getInjectInboundBuffsSizes returns packet memory and a sizes slice for usage
// when calling tstun.Wrapper.InjectInboundPacketBuffer(). These are sized with
// consideration for MTU and GSO support on ns.linkEP. They should be recycled