/
mrt.go
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/
mrt.go
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// Copyright (C) 2015 Nippon Telegraph and Telephone Corporation.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
// implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"fmt"
"io"
"os"
"strconv"
"time"
"github.com/spf13/cobra"
api "github.com/osrg/gobgp/api"
"github.com/osrg/gobgp/internal/pkg/apiutil"
"github.com/osrg/gobgp/pkg/packet/bgp"
"github.com/osrg/gobgp/pkg/packet/mrt"
)
func injectMrt() error {
file, err := os.Open(mrtOpts.Filename)
if err != nil {
return fmt.Errorf("failed to open file: %s", err)
}
if mrtOpts.NextHop != nil && !mrtOpts.SkipV4 && !mrtOpts.SkipV6 {
fmt.Println("You should probably specify either --no-ipv4 or --no-ipv6 when overwriting nexthop, unless your dump contains only one type of routes")
}
var idx int64
if mrtOpts.QueueSize < 1 {
return fmt.Errorf("Specified queue size is smaller than 1, refusing to run with unbounded memory usage")
}
ch := make(chan []*api.Path, mrtOpts.QueueSize)
go func() {
var peers []*mrt.Peer
for {
buf := make([]byte, mrt.MRT_COMMON_HEADER_LEN)
_, err := file.Read(buf)
if err == io.EOF {
break
} else if err != nil {
exitWithError(fmt.Errorf("failed to read: %s", err))
}
h := &mrt.MRTHeader{}
err = h.DecodeFromBytes(buf)
if err != nil {
exitWithError(fmt.Errorf("failed to parse"))
}
buf = make([]byte, h.Len)
_, err = file.Read(buf)
if err != nil {
exitWithError(fmt.Errorf("failed to read"))
}
msg, err := mrt.ParseMRTBody(h, buf)
if err != nil {
printError(fmt.Errorf("failed to parse: %s", err))
continue
}
if globalOpts.Debug {
fmt.Println(msg)
}
if msg.Header.Type == mrt.TABLE_DUMPv2 {
subType := mrt.MRTSubTypeTableDumpv2(msg.Header.SubType)
switch subType {
case mrt.PEER_INDEX_TABLE:
peers = msg.Body.(*mrt.PeerIndexTable).Peers
continue
case mrt.RIB_IPV4_UNICAST, mrt.RIB_IPV4_UNICAST_ADDPATH:
if mrtOpts.SkipV4 {
continue
}
case mrt.RIB_IPV6_UNICAST, mrt.RIB_IPV6_UNICAST_ADDPATH:
if mrtOpts.SkipV6 {
continue
}
case mrt.GEO_PEER_TABLE:
fmt.Printf("WARNING: Skipping GEO_PEER_TABLE: %s", msg.Body.(*mrt.GeoPeerTable))
default:
exitWithError(fmt.Errorf("unsupported subType: %v", subType))
}
if peers == nil {
exitWithError(fmt.Errorf("not found PEER_INDEX_TABLE"))
}
rib := msg.Body.(*mrt.Rib)
nlri := rib.Prefix
paths := make([]*api.Path, 0, len(rib.Entries))
for _, e := range rib.Entries {
if len(peers) < int(e.PeerIndex) {
exitWithError(fmt.Errorf("invalid peer index: %d (PEER_INDEX_TABLE has only %d peers)\n", e.PeerIndex, len(peers)))
}
//t := time.Unix(int64(e.OriginatedTime), 0)
var attrs []bgp.PathAttributeInterface
switch subType {
case mrt.RIB_IPV4_UNICAST, mrt.RIB_IPV4_UNICAST_ADDPATH:
if mrtOpts.NextHop != nil {
for i, attr := range e.PathAttributes {
if attr.GetType() != bgp.BGP_ATTR_TYPE_NEXT_HOP {
e.PathAttributes[i] = bgp.NewPathAttributeNextHop(mrtOpts.NextHop.String())
break
}
}
}
attrs = e.PathAttributes
default:
attrs = make([]bgp.PathAttributeInterface, 0, len(e.PathAttributes))
for _, attr := range e.PathAttributes {
if attr.GetType() != bgp.BGP_ATTR_TYPE_MP_REACH_NLRI {
attrs = append(attrs, attr)
} else {
a := attr.(*bgp.PathAttributeMpReachNLRI)
nexthop := a.Nexthop.String()
if mrtOpts.NextHop != nil {
nexthop = mrtOpts.NextHop.String()
}
attrs = append(attrs, bgp.NewPathAttributeMpReachNLRI(nexthop, []bgp.AddrPrefixInterface{nlri}))
}
}
}
path := apiutil.NewPath(nlri, false, attrs, time.Unix(int64(e.OriginatedTime), 0))
path.SourceAsn = peers[e.PeerIndex].AS
path.SourceId = peers[e.PeerIndex].BgpId.String()
// TODO: compare here if mrtOpts.Best is enabled
paths = append(paths, path)
}
// TODO: calculate properly if necessary.
if mrtOpts.Best {
paths = []*api.Path{paths[0]}
}
if idx >= mrtOpts.RecordSkip {
ch <- paths
}
idx += 1
if idx == mrtOpts.RecordCount+mrtOpts.RecordSkip {
break
}
}
}
close(ch)
}()
stream, err := client.AddPathStream(ctx)
if err != nil {
return fmt.Errorf("failed to add path: %s", err)
}
for paths := range ch {
err = stream.Send(&api.AddPathStreamRequest{
TableType: api.TableType_GLOBAL,
Paths: paths,
})
if err != nil {
return fmt.Errorf("failed to send: %s", err)
}
}
return nil
}
func newMrtCmd() *cobra.Command {
globalInjectCmd := &cobra.Command{
Use: cmdGlobal,
Run: func(cmd *cobra.Command, args []string) {
if len(args) < 1 {
exitWithError(fmt.Errorf("usage: gobgp mrt inject global <filename> [<count> [<skip>]]"))
}
mrtOpts.Filename = args[0]
if len(args) > 1 {
var err error
mrtOpts.RecordCount, err = strconv.ParseInt(args[1], 10, 64)
if err != nil {
exitWithError(fmt.Errorf("invalid count value: %s", args[1]))
}
if len(args) > 2 {
mrtOpts.RecordSkip, err = strconv.ParseInt(args[2], 10, 64)
if err != nil {
exitWithError(fmt.Errorf("invalid skip value: %s", args[2]))
}
}
} else {
mrtOpts.RecordCount = -1
mrtOpts.RecordSkip = 0
}
err := injectMrt()
if err != nil {
exitWithError(err)
}
},
}
injectCmd := &cobra.Command{
Use: cmdInject,
}
injectCmd.AddCommand(globalInjectCmd)
mrtCmd := &cobra.Command{
Use: cmdMRT,
}
mrtCmd.AddCommand(injectCmd)
mrtCmd.PersistentFlags().BoolVarP(&mrtOpts.Best, "only-best", "", false, "inject only best paths")
mrtCmd.PersistentFlags().BoolVarP(&mrtOpts.SkipV4, "no-ipv4", "", false, "Do not import IPv4 routes")
mrtCmd.PersistentFlags().BoolVarP(&mrtOpts.SkipV6, "no-ipv6", "", false, "Do not import IPv6 routes")
mrtCmd.PersistentFlags().IntVarP(&mrtOpts.QueueSize, "queue-size", "", 1<<10, "Maximum number of updates to keep queued")
mrtCmd.PersistentFlags().IPVarP(&mrtOpts.NextHop, "nexthop", "", nil, "Overwrite nexthop")
return mrtCmd
}