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htlcswitch+router: add onion error obfuscation

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Within the network, it's important that when an HTLC forwarding failure
occurs, the recipient is notified in a timely manner in order to ensure
that errors are graceful and not unknown. For that reason with
accordance to BOLT №4 onion failure obfuscation have been added.
This commit is contained in:
Andrey Samokhvalov
2017-06-29 16:40:45 +03:00
committed by Olaoluwa Osuntokun
parent ef73062c14
commit 2d378b3280
13 changed files with 639 additions and 212 deletions
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37
htlcswitch/packet.go
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@@ -29,12 +29,27 @@ type htlcPacket struct {
src lnwire.ShortChannelID
// amount is the value of the HTLC that is being created or modified.
//
// TODO(andrew.shvv) should be removed after introducing sphinx payment.
amount btcutil.Amount
// htlc lnwire message type of which depends on switch request type.
htlc lnwire.Message
// obfuscator is entity which is needed to make the obfuscation of the
// onion failure, it is carried inside the packet from channel
// link to the switch because we have to create onion error inside the
// switch to, but we unable to restore obfuscator from the onion, because
// on stage of forwarding onion inside payment belongs to the remote node.
// TODO(andrew.shvv) revisit after refactoring the way of returning errors
// inside the htlcswitch packet.
obfuscator Obfuscator
// isObfuscated is used in case if switch sent the packet to the link,
// but error have occurred locally, in this case we shouldn't obfuscate
// it again.
// TODO(andrew.shvv) revisit after refactoring the way of returning errors
// inside the htlcswitch packet.
isObfuscated bool
}
// newInitPacket creates htlc switch add packet which encapsulates the add htlc
@@ -49,12 +64,13 @@ func newInitPacket(destNode [33]byte, htlc *lnwire.UpdateAddHTLC) *htlcPacket {
// newAddPacket creates htlc switch add packet which encapsulates the add htlc
// request and additional information for proper forwarding over htlc switch.
func newAddPacket(src, dest lnwire.ShortChannelID,
htlc *lnwire.UpdateAddHTLC) *htlcPacket {
htlc *lnwire.UpdateAddHTLC, obfuscator Obfuscator) *htlcPacket {
return &htlcPacket{
dest: dest,
src: src,
htlc: htlc,
dest: dest,
src: src,
htlc: htlc,
obfuscator: obfuscator,
}
}
@@ -77,11 +93,12 @@ func newSettlePacket(src lnwire.ShortChannelID, htlc *lnwire.UpdateFufillHTLC,
// add request if something wrong happened on the path to the final
// destination.
func newFailPacket(src lnwire.ShortChannelID, htlc *lnwire.UpdateFailHTLC,
payHash [sha256.Size]byte, amount btcutil.Amount) *htlcPacket {
payHash [sha256.Size]byte, amount btcutil.Amount, isObfuscated bool) *htlcPacket {
return &htlcPacket{
src: src,
payHash: payHash,
htlc: htlc,
amount: amount,
src: src,
payHash: payHash,
htlc: htlc,
amount: amount,
isObfuscated: isObfuscated,
}
}