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Use the correct source IP when binding multiple IPs

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When the server is listening on multiple interfaces or interfaces with
multiple IPs, the outgoing datagrams are sometime delivered with the
wrong source IP address.

In order to fix that, each quic connection needs to extract the
destination IP (and optionally interface id) of the received datagrams,
and set it as source IP (and interface) on the sent datagrams.

On most platforms, this can be done using ancillary data with recvmsg()
and sendmsg(). Some of the machinery for this is already there for ECN,
this change extends it to read the destination IP info and write it to
the outgoing packets.

Fix #1736
This commit is contained in:
Olivier Poitrey 2021-03-16 00:43:41 +01:00
parent 3bce408c8d
commit eb6bdfdfc1
15 changed files with 468 additions and 181 deletions
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17
client.go
View file

@ -116,13 +116,14 @@ func dialAddrContext(
return dialContext(ctx, udpConn, udpAddr, addr, tlsConf, config, use0RTT, true)
}
// Dial establishes a new QUIC connection to a server using a net.PacketConn.
// If the PacketConn satisfies the ECNCapablePacketConn interface (as a net.UDPConn does), ECN support will be enabled.
// In this case, ReadMsgUDP will be used instead of ReadFrom to read packets.
// The same PacketConn can be used for multiple calls to Dial and Listen,
// QUIC connection IDs are used for demultiplexing the different connections.
// The host parameter is used for SNI.
// The tls.Config must define an application protocol (using NextProtos).
// Dial establishes a new QUIC connection to a server using a net.PacketConn. If
// the PacketConn satisfies the OOBCapablePacketConn interface (as a net.UDPConn
// does), ECN and packet info support will be enabled. In this case, ReadMsgUDP
// and WriteMsgUDP will be used instead of ReadFrom and WriteTo to read/write
// packets. The same PacketConn can be used for multiple calls to Dial and
// Listen, QUIC connection IDs are used for demultiplexing the different
// connections. The host parameter is used for SNI. The tls.Config must define
// an application protocol (using NextProtos).
func Dial(
pconn net.PacketConn,
remoteAddr net.Addr,
@ -255,7 +256,7 @@ func newClient(
c := &client{
srcConnID: srcConnID,
destConnID: destConnID,
conn: newSendConn(pconn, remoteAddr),
conn: newSendPconn(pconn, remoteAddr),
createdPacketConn: createdPacketConn,
use0RTT: use0RTT,
tlsConf: tlsConf,