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Cache crypto-key routes (until routing table changes)

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This commit is contained in:
Neil Alexander 2018-11-05 17:31:10 +00:00
parent ec751e8cc7
commit 295e9c9a10
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GPG Key ID: A02A2019A2BB0944
1 changed files with 37 additions and 14 deletions
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51
src/yggdrasil/ckr.go
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@ -16,6 +16,8 @@ type cryptokey struct {
enabled bool
ipv4routes []cryptokey_route
ipv6routes []cryptokey_route
ipv4cache map[address]cryptokey_route
ipv6cache map[address]cryptokey_route
}
type cryptokey_route struct {
@ -27,6 +29,8 @@ func (c *cryptokey) init(core *Core) {
c.core = core
c.ipv4routes = make([]cryptokey_route, 0)
c.ipv6routes = make([]cryptokey_route, 0)
c.ipv4cache = make(map[address]cryptokey_route, 0)
c.ipv6cache = make(map[address]cryptokey_route, 0)
}
func (c *cryptokey) isEnabled() bool {
@ -68,12 +72,20 @@ func (c *cryptokey) addRoute(cidr string, dest string) error {
subnet: *ipnet,
destination: boxPubKey,
})
// Sort so most specific routes are first
sort.Slice(c.ipv6routes, func(i, j int) bool {
im, _ := c.ipv6routes[i].subnet.Mask.Size()
jm, _ := c.ipv6routes[j].subnet.Mask.Size()
return im > jm
})
// Clear the cache as this route might change future routing
// Setting an empty slice keeps the memory whereas nil invokes GC
for k := range c.ipv6cache {
delete(c.ipv6cache, k)
}
return nil
}
} else if prefixsize == net.IPv4len*8 {
@ -83,28 +95,39 @@ func (c *cryptokey) addRoute(cidr string, dest string) error {
return errors.New("Unspecified error")
}
func (c *cryptokey) getPublicKeyForAddress(addr string) (boxPubKey, error) {
ipaddr := net.ParseIP(addr)
func (c *cryptokey) getPublicKeyForAddress(addr address) (boxPubKey, error) {
// Check if there's a cache entry for this addr
if route, ok := c.ipv6cache[addr]; ok {
var box boxPubKey
copy(box[:boxPubKeyLen], route.destination)
return box, nil
}
if ipaddr.To4() == nil {
// IPv6
// No cache was found - start by converting the address into a net.IP
ip := make(net.IP, 16)
copy(ip[:16], addr[:])
// Check whether it's an IPv4 or an IPv6 address
if ip.To4() == nil {
// Check if we have a route. At this point c.ipv6routes should be
// pre-sorted so that the most specific routes are first
for _, route := range c.ipv6routes {
if route.subnet.Contains(ipaddr) {
// Does this subnet match the given IP?
if route.subnet.Contains(ip) {
// Cache the entry for future packets to get a faster lookup
c.ipv6cache[addr] = route
// Return the boxPubKey
var box boxPubKey
copy(box[:boxPubKeyLen], route.destination)
return box, nil
}
}
} else {
// IPv4
// IPv4 isn't supported yet
return boxPubKey{}, errors.New("IPv4 not supported at this time")
/*
for _, route := range c.ipv4routes {
if route.subnet.Contains(ipaddr) {
return route.destination, nil
}
}
*/
}
return boxPubKey{}, errors.New(fmt.Sprintf("No route to %s", addr))
// No route was found if we got to this point
return boxPubKey{}, errors.New(fmt.Sprintf("No route to %s", ip.String()))
}