68 lines
1.7 KiB
Go
68 lines
1.7 KiB
Go
// Copyright 2017 CNI authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package main
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import (
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"crypto/sha512"
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"fmt"
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"net"
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"github.com/vishvananda/netlink"
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)
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const maxChainNameLength = 28
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// fmtIpPort correctly formats ip:port literals for iptables and ip6tables -
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// need to wrap v6 literals in a []
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func fmtIpPort(ip net.IP, port int) string {
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if ip.To4() == nil {
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return fmt.Sprintf("[%s]:%d", ip.String(), port)
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}
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return fmt.Sprintf("%s:%d", ip.String(), port)
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}
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func localhostIP(isV6 bool) string {
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if isV6 {
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return "::1"
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}
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return "127.0.0.1"
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}
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// getRoutableHostIF will try and determine which interface routes the container's
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// traffic. This is the one on which we disable martian filtering.
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func getRoutableHostIF(containerIP net.IP) string {
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routes, err := netlink.RouteGet(containerIP)
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if err != nil {
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return ""
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}
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for _, route := range routes {
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link, err := netlink.LinkByIndex(route.LinkIndex)
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if err != nil {
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continue
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}
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return link.Attrs().Name
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}
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return ""
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}
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func formatChainName(prefix, name, id string) string {
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chainBytes := sha512.Sum512([]byte(name + id))
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chain := fmt.Sprintf("CNI-%s%x", prefix, chainBytes)
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return chain[:maxChainNameLength]
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}
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