mirror of
https://github.com/tailscale/tailscale.git
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1eb95c7e32
Only use the ones in types/ipproto now. Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
146 lines
3.5 KiB
Go
146 lines
3.5 KiB
Go
// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package filter
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import (
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"fmt"
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"strings"
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"inet.af/netaddr"
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"tailscale.com/tailcfg"
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"tailscale.com/types/ipproto"
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)
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var defaultProtos = []ipproto.Proto{
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ipproto.TCP,
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ipproto.UDP,
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ipproto.ICMPv4,
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ipproto.ICMPv6,
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}
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// MatchesFromFilterRules converts tailcfg FilterRules into Matches.
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// If an error is returned, the Matches result is still valid,
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// containing the rules that were successfully converted.
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func MatchesFromFilterRules(pf []tailcfg.FilterRule) ([]Match, error) {
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mm := make([]Match, 0, len(pf))
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var erracc error
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for _, r := range pf {
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m := Match{}
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if len(r.IPProto) == 0 {
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m.IPProto = append([]ipproto.Proto(nil), defaultProtos...)
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} else {
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m.IPProto = make([]ipproto.Proto, 0, len(r.IPProto))
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for _, n := range r.IPProto {
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if n >= 0 && n <= 0xff {
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m.IPProto = append(m.IPProto, ipproto.Proto(n))
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}
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}
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}
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for i, s := range r.SrcIPs {
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var bits *int
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if len(r.SrcBits) > i {
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bits = &r.SrcBits[i]
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}
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nets, err := parseIPSet(s, bits)
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if err != nil && erracc == nil {
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erracc = err
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continue
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}
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m.Srcs = append(m.Srcs, nets...)
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}
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for _, d := range r.DstPorts {
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nets, err := parseIPSet(d.IP, d.Bits)
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if err != nil && erracc == nil {
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erracc = err
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continue
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}
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for _, net := range nets {
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m.Dsts = append(m.Dsts, NetPortRange{
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Net: net,
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Ports: PortRange{
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First: d.Ports.First,
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Last: d.Ports.Last,
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},
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})
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}
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}
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mm = append(mm, m)
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}
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return mm, erracc
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}
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var (
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zeroIP4 = netaddr.IPv4(0, 0, 0, 0)
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zeroIP6 = netaddr.IPFrom16([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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//
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// TODO(bradfitz): make this return an IPSet and plumb that all
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// around, and ultimately use a new version of IPSet.ContainsFunc like
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// Contains16Func that works in [16]byte address, so we we can match
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// at runtime without allocating?
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func parseIPSet(arg string, bits *int) ([]netaddr.IPPrefix, error) {
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if arg == "*" {
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// User explicitly requested wildcard.
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return []netaddr.IPPrefix{
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{IP: zeroIP4, Bits: 0},
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{IP: zeroIP6, Bits: 0},
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}, nil
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}
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if strings.Contains(arg, "/") {
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pfx, err := netaddr.ParseIPPrefix(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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return []netaddr.IPPrefix{pfx}, nil
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}
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if strings.Count(arg, "-") == 1 {
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i := strings.Index(arg, "-")
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ip1s, ip2s := arg[:i], arg[i+1:]
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ip1, err := netaddr.ParseIP(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 := netaddr.ParseIP(ip2s)
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if err != nil {
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return nil, err
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}
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r := netaddr.IPRange{From: ip1, To: ip2}
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if !r.Valid() {
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return nil, fmt.Errorf("invalid IP range %q", arg)
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}
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return r.Prefixes(), nil
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}
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ip, err := netaddr.ParseIP(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 := 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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return []netaddr.IPPrefix{{IP: ip, Bits: bits8}}, nil
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}
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