snow/wireguard-go
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device: reduce size of trie struct

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Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld 2021-06-03 13:51:03 +02:00
parent 64cb82f2b3
commit 4a57024b94
5 changed files with 45 additions and 53 deletions
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68
device/allowedips.go
View file

@ -15,13 +15,13 @@ import (
)
type trieEntry struct {
child [2]*trieEntry
peer *Peer
bits net.IP
cidr uint
bit_at_byte uint
bit_at_shift uint
perPeerElem *list.Element
peer *Peer
child [2]*trieEntry
cidr uint8
bitAtByte uint8
bitAtShift uint8
bits net.IP
perPeerElem *list.Element
}
func isLittleEndian() bool {
@ -45,24 +45,24 @@ func swapU64(i uint64) uint64 {
return bits.ReverseBytes64(i)
}
func commonBits(ip1 net.IP, ip2 net.IP) uint {
func commonBits(ip1 net.IP, ip2 net.IP) uint8 {
size := len(ip1)
if size == net.IPv4len {
a := (*uint32)(unsafe.Pointer(&ip1[0]))
b := (*uint32)(unsafe.Pointer(&ip2[0]))
x := *a ^ *b
return uint(bits.LeadingZeros32(swapU32(x)))
return uint8(bits.LeadingZeros32(swapU32(x)))
} else if size == net.IPv6len {
a := (*uint64)(unsafe.Pointer(&ip1[0]))
b := (*uint64)(unsafe.Pointer(&ip2[0]))
x := *a ^ *b
if x != 0 {
return uint(bits.LeadingZeros64(swapU64(x)))
return uint8(bits.LeadingZeros64(swapU64(x)))
}
a = (*uint64)(unsafe.Pointer(&ip1[8]))
b = (*uint64)(unsafe.Pointer(&ip2[8]))
x = *a ^ *b
return 64 + uint(bits.LeadingZeros64(swapU64(x)))
return 64 + uint8(bits.LeadingZeros64(swapU64(x)))
} else {
panic("Wrong size bit string")
}
@ -104,7 +104,7 @@ func (node *trieEntry) removeByPeer(p *Peer) *trieEntry {
}
func (node *trieEntry) choose(ip net.IP) byte {
return (ip[node.bit_at_byte] >> node.bit_at_shift) & 1
return (ip[node.bitAtByte] >> node.bitAtShift) & 1
}
func (node *trieEntry) maskSelf() {
@ -114,17 +114,17 @@ func (node *trieEntry) maskSelf() {
}
}
func (node *trieEntry) insert(ip net.IP, cidr uint, peer *Peer) *trieEntry {
func (node *trieEntry) insert(ip net.IP, cidr uint8, peer *Peer) *trieEntry {
// at leaf
if node == nil {
node := &trieEntry{
bits: ip,
peer: peer,
cidr: cidr,
bit_at_byte: cidr / 8,
bit_at_shift: 7 - (cidr % 8),
bits: ip,
peer: peer,
cidr: cidr,
bitAtByte: cidr / 8,
bitAtShift: 7 - (cidr % 8),
}
node.maskSelf()
node.addToPeerEntries()
@ -149,16 +149,18 @@ func (node *trieEntry) insert(ip net.IP, cidr uint, peer *Peer) *trieEntry {
// split node
newNode := &trieEntry{
bits: ip,
peer: peer,
cidr: cidr,
bit_at_byte: cidr / 8,
bit_at_shift: 7 - (cidr % 8),
bits: ip,
peer: peer,
cidr: cidr,
bitAtByte: cidr / 8,
bitAtShift: 7 - (cidr % 8),
}
newNode.maskSelf()
newNode.addToPeerEntries()
cidr = min(cidr, common)
if common < cidr {
cidr = common
}
// check for shorter prefix
@ -171,11 +173,11 @@ func (node *trieEntry) insert(ip net.IP, cidr uint, peer *Peer) *trieEntry {
// create new parent for node & newNode
parent := &trieEntry{
bits: append([]byte{}, ip...),
peer: nil,
cidr: cidr,
bit_at_byte: cidr / 8,
bit_at_shift: 7 - (cidr % 8),
bits: append([]byte{}, ip...),
peer: nil,
cidr: cidr,
bitAtByte: cidr / 8,
bitAtShift: 7 - (cidr % 8),
}
parent.maskSelf()
@ -188,12 +190,12 @@ func (node *trieEntry) insert(ip net.IP, cidr uint, peer *Peer) *trieEntry {
func (node *trieEntry) lookup(ip net.IP) *Peer {
var found *Peer
size := uint(len(ip))
size := uint8(len(ip))
for node != nil && commonBits(node.bits, ip) >= node.cidr {
if node.peer != nil {
found = node.peer
}
if node.bit_at_byte == size {
if node.bitAtByte == size {
break
}
bit := node.choose(ip)
@ -208,7 +210,7 @@ type AllowedIPs struct {
mutex sync.RWMutex
}
func (table *AllowedIPs) EntriesForPeer(peer *Peer, cb func(ip net.IP, cidr uint) bool) {
func (table *AllowedIPs) EntriesForPeer(peer *Peer, cb func(ip net.IP, cidr uint8) bool) {
table.mutex.RLock()
defer table.mutex.RUnlock()
@ -228,7 +230,7 @@ func (table *AllowedIPs) RemoveByPeer(peer *Peer) {
table.IPv6 = table.IPv6.removeByPeer(peer)
}
func (table *AllowedIPs) Insert(ip net.IP, cidr uint, peer *Peer) {
func (table *AllowedIPs) Insert(ip net.IP, cidr uint8, peer *Peer) {
table.mutex.Lock()
defer table.mutex.Unlock()

8
device/allowedips_rand_test.go
View file

@ -19,7 +19,7 @@ const (
type SlowNode struct {
peer *Peer
cidr uint
cidr uint8
bits []byte
}
@ -37,7 +37,7 @@ func (r SlowRouter) Swap(i, j int) {
r[i], r[j] = r[j], r[i]
}
func (r SlowRouter) Insert(addr []byte, cidr uint, peer *Peer) SlowRouter {
func (r SlowRouter) Insert(addr []byte, cidr uint8, peer *Peer) SlowRouter {
for _, t := range r {
if t.cidr == cidr && commonBits(t.bits, addr) >= cidr {
t.peer = peer
@ -80,7 +80,7 @@ func TestTrieRandomIPv4(t *testing.T) {
for n := 0; n < NumberOfAddresses; n++ {
var addr [AddressLength]byte
rand.Read(addr[:])
cidr := uint(rand.Uint32() % (AddressLength * 8))
cidr := uint8(rand.Uint32() % (AddressLength * 8))
index := rand.Int() % NumberOfPeers
trie = trie.insert(addr[:], cidr, peers[index])
slow = slow.Insert(addr[:], cidr, peers[index])
@ -113,7 +113,7 @@ func TestTrieRandomIPv6(t *testing.T) {
for n := 0; n < NumberOfAddresses; n++ {
var addr [AddressLength]byte
rand.Read(addr[:])
cidr := uint(rand.Uint32() % (AddressLength * 8))
cidr := uint8(rand.Uint32() % (AddressLength * 8))
index := rand.Int() % NumberOfPeers
trie = trie.insert(addr[:], cidr, peers[index])
slow = slow.Insert(addr[:], cidr, peers[index])

11
device/allowedips_test.go
View file

@ -11,13 +11,10 @@ import (
"testing"
)
/* Todo: More comprehensive
*/
type testPairCommonBits struct {
s1 []byte
s2 []byte
match uint
match uint8
}
func TestCommonBits(t *testing.T) {
@ -57,7 +54,7 @@ func benchmarkTrie(peerNumber int, addressNumber int, addressLength int, b *test
for n := 0; n < addressNumber; n++ {
var addr [AddressLength]byte
rand.Read(addr[:])
cidr := uint(rand.Uint32() % (AddressLength * 8))
cidr := uint8(rand.Uint32() % (AddressLength * 8))
index := rand.Int() % peerNumber
trie = trie.insert(addr[:], cidr, peers[index])
}
@ -99,7 +96,7 @@ func TestTrieIPv4(t *testing.T) {
var trie *trieEntry
insert := func(peer *Peer, a, b, c, d byte, cidr uint) {
insert := func(peer *Peer, a, b, c, d byte, cidr uint8) {
trie = trie.insert([]byte{a, b, c, d}, cidr, peer)
}
@ -195,7 +192,7 @@ func TestTrieIPv6(t *testing.T) {
return out[:]
}
insert := func(peer *Peer, a, b, c, d uint32, cidr uint) {
insert := func(peer *Peer, a, b, c, d uint32, cidr uint8) {
var addr []byte
addr = append(addr, expand(a)...)
addr = append(addr, expand(b)...)

7
device/misc.go
View file

@ -39,10 +39,3 @@ func (a *AtomicBool) Set(val bool) {
}
atomic.StoreInt32(&a.int32, flag)
}
func min(a, b uint) uint {
if a > b {
return b
}
return a
}

4
device/uapi.go
View file

@ -121,7 +121,7 @@ func (device *Device) IpcGetOperation(w io.Writer) error {
sendf("rx_bytes=%d", atomic.LoadUint64(&peer.stats.rxBytes))
sendf("persistent_keepalive_interval=%d", atomic.LoadUint32(&peer.persistentKeepaliveInterval))
device.allowedips.EntriesForPeer(peer, func(ip net.IP, cidr uint) bool {
device.allowedips.EntriesForPeer(peer, func(ip net.IP, cidr uint8) bool {
sendf("allowed_ip=%s/%d", ip.String(), cidr)
return true
})
@ -379,7 +379,7 @@ func (device *Device) handlePeerLine(peer *ipcSetPeer, key, value string) error
return nil
}
ones, _ := network.Mask.Size()
device.allowedips.Insert(network.IP, uint(ones), peer.Peer)
device.allowedips.Insert(network.IP, uint8(ones), peer.Peer)
case "protocol_version":
if value != "1" {