forked from networkservicemesh/networkservicemesh
/
excluded_prefixes_service.go
110 lines (92 loc) · 3.51 KB
/
excluded_prefixes_service.go
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// Copyright (c) 2019 Cisco Systems, Inc.
//
// SPDX-License-Identifier: Apache-2.0
//
// 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 common
import (
"context"
"github.com/golang/protobuf/ptypes/empty"
"github.com/pkg/errors"
"github.com/networkservicemesh/networkservicemesh/controlplane/api/connection"
"github.com/networkservicemesh/networkservicemesh/controlplane/api/connectioncontext"
"github.com/networkservicemesh/networkservicemesh/controlplane/api/networkservice"
"github.com/networkservicemesh/networkservicemesh/sdk/prefix_pool"
)
// ConnectionService makes basic Mechanism selection for the incoming connection
type excludedPrefixesService struct {
prefixes prefix_pool.PrefixPool
}
// NewExcludedPrefixesService - creates a service to select endpoint.
func NewExcludedPrefixesService() networkservice.NetworkServiceServer {
return NewExcludedPrefixesServiceFromPath(prefix_pool.PrefixesFilePathDefault)
}
// NewExcludedPrefixesService - creates a service to select endpoint.
func NewExcludedPrefixesServiceFromPath(configPath string) networkservice.NetworkServiceServer {
return &excludedPrefixesService{
prefixes: prefix_pool.NewPrefixPoolReader(configPath),
}
}
func (eps *excludedPrefixesService) Request(ctx context.Context, request *networkservice.NetworkServiceRequest) (*connection.Connection, error) {
logger := Log(ctx)
if request.GetConnection() == nil {
return nil, errors.Errorf("request's connection cannot be empty")
}
requestNext := request.Clone()
conn := requestNext.Connection
if conn.Context == nil {
conn.Context = &connectioncontext.ConnectionContext{}
}
if conn.Context.IpContext == nil {
conn.Context.IpContext = &connectioncontext.IPContext{}
}
prefixes := eps.prefixes.GetPrefixes()
logger.Infof("ExcludedPrefixesService: adding excluded prefixes to connection: %v", prefixes)
ipCtx := conn.Context.IpContext
ipCtx.ExcludedPrefixes = append(ipCtx.GetExcludedPrefixes(), prefixes...)
conn, err := ProcessNext(ctx, requestNext)
if err != nil {
return nil, err
}
if err = eps.validateConnection(conn); err != nil {
logger.Errorf("ExcludedPrefixesService: connection is invalid: %v", err)
return nil, err
}
return conn, nil
}
func (eps *excludedPrefixesService) validateConnection(conn *connection.Connection) error {
if err := conn.IsComplete(); err != nil {
return err
}
ipCtx := conn.GetContext().GetIpContext()
if err := eps.validateIPAddress(ipCtx.GetSrcIpAddr(), "srcIP"); err != nil {
return err
}
return eps.validateIPAddress(ipCtx.GetDstIpAddr(), "dstIP")
}
func (eps *excludedPrefixesService) validateIPAddress(ip, ipName string) error {
if ip == "" {
return nil
}
intersect, err := eps.prefixes.Intersect(ip)
if err != nil {
return err
}
if intersect {
return errors.Errorf("%s '%s' intersects excluded prefixes list %v", ipName, ip, eps.prefixes.GetPrefixes())
}
return nil
}
func (eps *excludedPrefixesService) Close(ctx context.Context, connection *connection.Connection) (*empty.Empty, error) {
return ProcessClose(ctx, connection)
}