/
egress.go
86 lines (73 loc) · 2.6 KB
/
egress.go
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// Copyright 2022 Antrea Authors
//
// 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 openflow
import (
"net"
"antrea.io/antrea/pkg/agent/config"
"antrea.io/antrea/pkg/agent/openflow/cookie"
binding "antrea.io/antrea/pkg/ovs/openflow"
)
type featureEgress struct {
cookieAllocator cookie.Allocator
ipProtocols []binding.Protocol
cachedFlows *flowCategoryCache
exceptCIDRs map[binding.Protocol][]net.IPNet
nodeIPs map[binding.Protocol]net.IP
gatewayMAC net.HardwareAddr
category cookie.Category
}
func (f *featureEgress) getFeatureName() string {
return "Egress"
}
func newFeatureEgress(cookieAllocator cookie.Allocator,
ipProtocols []binding.Protocol,
nodeConfig *config.NodeConfig,
egressConfig *config.EgressConfig) *featureEgress {
exceptCIDRs := make(map[binding.Protocol][]net.IPNet)
for _, cidr := range egressConfig.ExceptCIDRs {
if cidr.IP.To4() == nil {
exceptCIDRs[binding.ProtocolIPv6] = append(exceptCIDRs[binding.ProtocolIPv6], cidr)
} else {
exceptCIDRs[binding.ProtocolIP] = append(exceptCIDRs[binding.ProtocolIP], cidr)
}
}
nodeIPs := make(map[binding.Protocol]net.IP)
for _, ipProtocol := range ipProtocols {
if ipProtocol == binding.ProtocolIP {
nodeIPs[ipProtocol] = nodeConfig.NodeIPv4Addr.IP
} else if ipProtocol == binding.ProtocolIPv6 {
nodeIPs[ipProtocol] = nodeConfig.NodeIPv6Addr.IP
}
}
return &featureEgress{
cachedFlows: newFlowCategoryCache(),
cookieAllocator: cookieAllocator,
exceptCIDRs: exceptCIDRs,
ipProtocols: ipProtocols,
nodeIPs: nodeIPs,
gatewayMAC: nodeConfig.GatewayConfig.MAC,
category: cookie.Egress,
}
}
func (f *featureEgress) initFlows() []binding.Flow {
// This installs the flows to enable Pods to communicate to the external IP addresses. The flows identify the packets
// from local Pods to the external IP address, and mark the packets to be SNAT'd with the configured SNAT IPs.
return f.externalFlows()
}
func (f *featureEgress) replayFlows() []binding.Flow {
var flows []binding.Flow
// Get cached flows.
flows = append(flows, getCachedFlows(f.cachedFlows)...)
return flows
}