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Link cost-aware routing

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This commit is contained in:
Neil Alexander 2024-02-01 22:23:16 +00:00
parent 5ea16e63a1
commit bfdcf0762f
No known key found for this signature in database
GPG Key ID: A02A2019A2BB0944
8 changed files with 53 additions and 6 deletions
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3
cmd/yggdrasilctl/main.go
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@ -174,7 +174,7 @@ func run() int {
if err := json.Unmarshal(recv.Response, &resp); err != nil {
panic(err)
}
table.SetHeader([]string{"URI", "State", "Dir", "IP Address", "Uptime", "RTT", "RX", "TX", "Pr", "Last Error"})
table.SetHeader([]string{"URI", "State", "Dir", "IP Address", "Uptime", "RTT", "RX", "TX", "Pr", "Cost", "Last Error"})
for _, peer := range resp.Peers {
state, lasterr, dir, rtt := "Up", "-", "Out", "-"
if !peer.Up {
@ -200,6 +200,7 @@ func run() int {
peer.RXBytes.String(),
peer.TXBytes.String(),
fmt.Sprintf("%d", peer.Priority),
fmt.Sprintf("%d", peer.Cost),
lasterr,
})
}

2
src/admin/getpeers.go
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@ -24,6 +24,7 @@ type PeerEntry struct {
PublicKey string `json:"key"`
Port uint64 `json:"port"`
Priority uint64 `json:"priority"`
Cost uint64 `json:"cost"`
RXBytes DataUnit `json:"bytes_recvd,omitempty"`
TXBytes DataUnit `json:"bytes_sent,omitempty"`
Uptime float64 `json:"uptime,omitempty"`
@ -41,6 +42,7 @@ func (a *AdminSocket) getPeersHandler(_ *GetPeersRequest, res *GetPeersResponse)
Up: p.Up,
Inbound: p.Inbound,
Priority: uint64(p.Priority), // can't be uint8 thanks to gobind
Cost: uint64(p.Cost), // can't be uint8 thanks to gobind
URI: p.URI,
RXBytes: DataUnit(p.RXBytes),
TXBytes: DataUnit(p.TXBytes),

2
src/core/api.go
View File

@ -30,6 +30,7 @@ type PeerInfo struct {
Coords []uint64
Port uint64
Priority uint8
Cost uint8
RXBytes uint64
TXBytes uint64
Uptime time.Duration
@ -94,6 +95,7 @@ func (c *Core) GetPeers() []PeerInfo {
peerinfo.Port = p.Port
peerinfo.Priority = p.Priority
peerinfo.Latency = p.Latency
peerinfo.Cost = p.Cost
}
peers = append(peers, peerinfo)
}

25
src/core/link.go
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@ -70,6 +70,7 @@ type link struct {
type linkOptions struct {
pinnedEd25519Keys map[keyArray]struct{}
priority uint8
cost uint8
tlsSNI string
password []byte
maxBackoff time.Duration
@ -139,6 +140,7 @@ func (e linkError) Error() string { return string(e) }
const ErrLinkAlreadyConfigured = linkError("peer is already configured")
const ErrLinkNotConfigured = linkError("peer is not configured")
const ErrLinkPriorityInvalid = linkError("priority value is invalid")
const ErrLinkCostInvalid = linkError("cost value is invalid")
const ErrLinkPinnedKeyInvalid = linkError("pinned public key is invalid")
const ErrLinkPasswordInvalid = linkError("password is invalid")
const ErrLinkUnrecognisedSchema = linkError("link schema unknown")
@ -181,6 +183,14 @@ func (l *links) add(u *url.URL, sintf string, linkType linkType) error {
}
options.priority = uint8(pi)
}
if p := u.Query().Get("cost"); p != "" {
c, err := strconv.ParseUint(p, 10, 8)
if err != nil {
retErr = ErrLinkCostInvalid
return
}
options.cost = uint8(c)
}
if p := u.Query().Get("password"); p != "" {
if len(p) > blake2b.Size {
retErr = ErrLinkPasswordInvalid
@ -448,6 +458,13 @@ func (l *links) listen(u *url.URL, sintf string) (*Listener, error) {
}
options.priority = uint8(pi)
}
if p := u.Query().Get("cost"); p != "" {
c, err := strconv.ParseUint(p, 10, 8)
if err != nil {
return nil, ErrLinkCostInvalid
}
options.cost = uint8(c)
}
if p := u.Query().Get("password"); p != "" {
if len(p) > blake2b.Size {
return nil, ErrLinkPasswordInvalid
@ -567,6 +584,7 @@ func (l *links) handler(linkType linkType, options linkOptions, conn net.Conn, s
meta := version_getBaseMetadata()
meta.publicKey = l.core.public
meta.priority = options.priority
meta.cost = options.cost
metaBytes, err := meta.encode(l.core.secret, options.password)
if err != nil {
return fmt.Errorf("failed to generate handshake: %w", err)
@ -628,17 +646,20 @@ func (l *links) handler(linkType linkType, options linkOptions, conn net.Conn, s
remoteAddr := net.IP(address.AddrForKey(meta.publicKey)[:]).String()
remoteStr := fmt.Sprintf("%s@%s", remoteAddr, conn.RemoteAddr())
localStr := conn.LocalAddr()
priority := options.priority
cost, priority := options.cost, options.priority
if meta.priority > priority {
priority = meta.priority
}
if meta.cost > cost {
cost = meta.cost
}
l.core.log.Infof("Connected %s: %s, source %s",
dir, remoteStr, localStr)
if success != nil {
success()
}
err = l.core.HandleConn(meta.publicKey, conn, priority)
err = l.core.HandleConn(meta.publicKey, conn, cost, priority)
switch err {
case io.EOF, net.ErrClosed, nil:
l.core.log.Infof("Disconnected %s: %s, source %s",

19
src/core/version.go
View File

@ -22,6 +22,7 @@ type version_metadata struct {
minorVer uint16
publicKey ed25519.PublicKey
priority uint8
cost uint8
}
const (
@ -36,6 +37,7 @@ const (
metaVersionMinor // uint16
metaPublicKey // [32]byte
metaPriority // uint8
metaCost // uint8
)
// Gets a base metadata with no keys set, but with the correct version numbers.
@ -64,9 +66,17 @@ func (m *version_metadata) encode(privateKey ed25519.PrivateKey, password []byte
bs = binary.BigEndian.AppendUint16(bs, ed25519.PublicKeySize)
bs = append(bs, m.publicKey[:]...)
bs = binary.BigEndian.AppendUint16(bs, metaPriority)
bs = binary.BigEndian.AppendUint16(bs, 1)
bs = append(bs, m.priority)
if m.priority > 0 {
bs = binary.BigEndian.AppendUint16(bs, metaPriority)
bs = binary.BigEndian.AppendUint16(bs, 1)
bs = append(bs, m.priority)
}
if m.cost > 0 {
bs = binary.BigEndian.AppendUint16(bs, metaCost)
bs = binary.BigEndian.AppendUint16(bs, 1)
bs = append(bs, m.cost)
}
hasher, err := blake2b.New512(password)
if err != nil {
@ -126,6 +136,9 @@ func (m *version_metadata) decode(r io.Reader, password []byte) error {
case metaPriority:
m.priority = bs[0]
case metaCost:
m.cost = bs[0]
}
bs = bs[oplen:]
}

3
src/core/version_test.go
View File

@ -52,6 +52,9 @@ func TestVersionRoundtrip(t *testing.T) {
{majorVer: 258, minorVer: 259},
{majorVer: 3, minorVer: 5, priority: 6},
{majorVer: 260, minorVer: 261, priority: 7},
{majorVer: 258, minorVer: 259, cost: 5},
{majorVer: 3, minorVer: 5, priority: 6, cost: 12},
{majorVer: 260, minorVer: 261, priority: 7, cost: 1},
} {
// Generate a random public key for each time, since it is
// a required field.

4
src/multicast/multicast.go
View File

@ -45,6 +45,7 @@ type interfaceInfo struct {
listen bool
port uint16
priority uint8
cost uint8
password []byte
hash []byte
}
@ -214,6 +215,7 @@ func (m *Multicast) _getAllowedInterfaces() map[string]*interfaceInfo {
listen: ifcfg.Listen,
port: ifcfg.Port,
priority: ifcfg.Priority,
cost: ifcfg.Cost,
password: []byte(ifcfg.Password),
hash: hasher.Sum(nil),
}
@ -314,6 +316,7 @@ func (m *Multicast) _announce() {
// No listener was found - let's create one
v := &url.Values{}
v.Add("priority", fmt.Sprintf("%d", info.priority))
v.Add("cost", fmt.Sprintf("%d", info.cost))
v.Add("password", string(info.password))
u := &url.URL{
Scheme: "tls",
@ -428,6 +431,7 @@ func (m *Multicast) listen() {
v := &url.Values{}
v.Add("key", hex.EncodeToString(adv.PublicKey))
v.Add("priority", fmt.Sprintf("%d", info.priority))
v.Add("cost", fmt.Sprintf("%d", info.cost))
v.Add("password", string(info.password))
u := &url.URL{
Scheme: "tls",

1
src/multicast/options.go
View File

@ -21,6 +21,7 @@ type MulticastInterface struct {
Listen bool
Port uint16
Priority uint8
Cost uint8
Password string
}