142 lines
2.9 KiB
Go
142 lines
2.9 KiB
Go
package headscale
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import (
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"fmt"
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"net/netip"
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"strings"
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"go4.org/netipx"
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"tailscale.com/tailcfg"
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)
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// This is borrowed from, and updated to use IPSet
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// https://github.com/tailscale/tailscale/blob/71029cea2ddf82007b80f465b256d027eab0f02d/wgengine/filter/tailcfg.go#L97-L162
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// TODO(kradalby): contribute upstream and make public.
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var (
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zeroIP4 = netip.AddrFrom4([4]byte{})
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zeroIP6 = netip.AddrFrom16([16]byte{})
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)
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// parseIPSet parses arg as one:
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//
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// - an IP address (IPv4 or IPv6)
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// - the string "*" to match everything (both IPv4 & IPv6)
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// - a CIDR (e.g. "192.168.0.0/16")
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// - a range of two IPs, inclusive, separated by hyphen ("2eff::1-2eff::0800")
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//
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// bits, if non-nil, is the legacy SrcBits CIDR length to make a IP
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// address (without a slash) treated as a CIDR of *bits length.
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// nolint
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func parseIPSet(arg string, bits *int) (*netipx.IPSet, error) {
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var ipSet netipx.IPSetBuilder
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if arg == "*" {
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ipSet.AddPrefix(netip.PrefixFrom(zeroIP4, 0))
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ipSet.AddPrefix(netip.PrefixFrom(zeroIP6, 0))
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return ipSet.IPSet()
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}
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if strings.Contains(arg, "/") {
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pfx, err := netip.ParsePrefix(arg)
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if err != nil {
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return nil, err
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}
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if pfx != pfx.Masked() {
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return nil, fmt.Errorf("%v contains non-network bits set", pfx)
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}
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ipSet.AddPrefix(pfx)
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return ipSet.IPSet()
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}
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if strings.Count(arg, "-") == 1 {
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ip1s, ip2s, _ := strings.Cut(arg, "-")
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ip1, err := netip.ParseAddr(ip1s)
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if err != nil {
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return nil, err
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}
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ip2, err := netip.ParseAddr(ip2s)
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if err != nil {
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return nil, err
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}
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r := netipx.IPRangeFrom(ip1, ip2)
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if !r.IsValid() {
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return nil, fmt.Errorf("invalid IP range %q", arg)
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}
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for _, prefix := range r.Prefixes() {
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ipSet.AddPrefix(prefix)
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}
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return ipSet.IPSet()
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}
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ip, err := netip.ParseAddr(arg)
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if err != nil {
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return nil, fmt.Errorf("invalid IP address %q", arg)
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}
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bits8 := uint8(ip.BitLen())
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if bits != nil {
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if *bits < 0 || *bits > int(bits8) {
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return nil, fmt.Errorf("invalid CIDR size %d for IP %q", *bits, arg)
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}
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bits8 = uint8(*bits)
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}
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ipSet.AddPrefix(netip.PrefixFrom(ip, int(bits8)))
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return ipSet.IPSet()
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}
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type Match struct {
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Srcs *netipx.IPSet
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Dests *netipx.IPSet
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}
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func MatchFromFilterRule(rule tailcfg.FilterRule) Match {
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srcs := new(netipx.IPSetBuilder)
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dests := new(netipx.IPSetBuilder)
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for _, srcIP := range rule.SrcIPs {
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set, _ := parseIPSet(srcIP, nil)
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srcs.AddSet(set)
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}
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for _, dest := range rule.DstPorts {
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set, _ := parseIPSet(dest.IP, nil)
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dests.AddSet(set)
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}
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srcsSet, _ := srcs.IPSet()
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destsSet, _ := dests.IPSet()
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match := Match{
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Srcs: srcsSet,
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Dests: destsSet,
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}
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return match
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}
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func (m *Match) SrcsContainsIPs(ips []netip.Addr) bool {
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for _, ip := range ips {
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if m.Srcs.Contains(ip) {
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return true
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}
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}
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return false
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}
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func (m *Match) DestsContainsIP(ips []netip.Addr) bool {
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for _, ip := range ips {
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if m.Dests.Contains(ip) {
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return true
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}
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}
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return false
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}
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