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// Copyright 2015 CNI 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 allocator
import (
"encoding/json"
"fmt"
"net"
"github.com/containernetworking/cni/pkg/types"
"github.com/containernetworking/cni/pkg/types/020"
)
// The top-level network config - IPAM plugins are passed the full configuration
// of the calling plugin, not just the IPAM section.
type Net struct {
Name string `json:"name"`
CNIVersion string `json:"cniVersion"`
IPAM *IPAMConfig `json:"ipam"`
RuntimeConfig struct { // The capability arg
IPRanges []RangeSet `json:"ipRanges,omitempty"`
} `json:"runtimeConfig,omitempty"`
Args *struct {
A *IPAMArgs `json:"cni"`
} `json:"args"`
}
// IPAMConfig represents the IP related network configuration.
// This nests Range because we initially only supported a single
// range directly, and wish to preserve backwards compatability
type IPAMConfig struct {
*Range
Name string
Type string `json:"type"`
Routes []*types.Route `json:"routes"`
DataDir string `json:"dataDir"`
ResolvConf string `json:"resolvConf"`
Ranges []RangeSet `json:"ranges"`
IPArgs []net.IP `json:"-"` // Requested IPs from CNI_ARGS and args
}
type IPAMEnvArgs struct {
types.CommonArgs
IP net.IP `json:"ip,omitempty"`
}
type IPAMArgs struct {
IPs []net.IP `json:"ips"`
}
type RangeSet []Range
type Range struct {
RangeStart net.IP `json:"rangeStart,omitempty"` // The first ip, inclusive
RangeEnd net.IP `json:"rangeEnd,omitempty"` // The last ip, inclusive
Subnet types.IPNet `json:"subnet"`
Gateway net.IP `json:"gateway,omitempty"`
}
// NewIPAMConfig creates a NetworkConfig from the given network name.
func LoadIPAMConfig(bytes []byte, envArgs string) (*IPAMConfig, string, error) {
n := Net{}
if err := json.Unmarshal(bytes, &n); err != nil {
return nil, "", err
}
if n.IPAM == nil {
return nil, "", fmt.Errorf("IPAM config missing 'ipam' key")
}
// Parse custom IP from both env args *and* the top-level args config
if envArgs != "" {
e := IPAMEnvArgs{}
err := types.LoadArgs(envArgs, &e)
if err != nil {
return nil, "", err
}
if e.IP != nil {
n.IPAM.IPArgs = []net.IP{e.IP}
}
}
if n.Args != nil && n.Args.A != nil && len(n.Args.A.IPs) != 0 {
n.IPAM.IPArgs = append(n.IPAM.IPArgs, n.Args.A.IPs...)
}
for idx := range n.IPAM.IPArgs {
if err := canonicalizeIP(&n.IPAM.IPArgs[idx]); err != nil {
return nil, "", fmt.Errorf("cannot understand ip: %v", err)
}
}
// If a single range (old-style config) is specified, prepend it to
// the Ranges array
if n.IPAM.Range != nil && n.IPAM.Range.Subnet.IP != nil {
n.IPAM.Ranges = append([]RangeSet{{*n.IPAM.Range}}, n.IPAM.Ranges...)
}
n.IPAM.Range = nil
// If a range is supplied as a runtime config, prepend it to the Ranges
if len(n.RuntimeConfig.IPRanges) > 0 {
n.IPAM.Ranges = append(n.RuntimeConfig.IPRanges, n.IPAM.Ranges...)
}
if len(n.IPAM.Ranges) == 0 {
return nil, "", fmt.Errorf("no IP ranges specified")
}
// Validate all ranges
numV4 := 0
numV6 := 0
for i := range n.IPAM.Ranges {
if err := n.IPAM.Ranges[i].Canonicalize(); err != nil {
return nil, "", fmt.Errorf("invalid range set %d: %s", i, err)
}
if n.IPAM.Ranges[i][0].RangeStart.To4() != nil {
numV4++
} else {
numV6++
}
}
// CNI spec 0.2.0 and below supported only one v4 and v6 address
if numV4 > 1 || numV6 > 1 {
for _, v := range types020.SupportedVersions {
if n.CNIVersion == v {
return nil, "", fmt.Errorf("CNI version %v does not support more than 1 address per family", n.CNIVersion)
}
}
}
// Check for overlaps
l := len(n.IPAM.Ranges)
for i, p1 := range n.IPAM.Ranges[:l-1] {
for j, p2 := range n.IPAM.Ranges[i+1:] {
if p1.Overlaps(&p2) {
return nil, "", fmt.Errorf("range set %d overlaps with %d", i, (i + j + 1))
}
}
}
// Copy net name into IPAM so not to drag Net struct around
n.IPAM.Name = n.Name
return n.IPAM, n.CNIVersion, nil
}
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