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xdp.go
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xdp.go
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// Copyright 2021 Authors of Cilium
//
// 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 loader
import (
"context"
"fmt"
"path"
"strings"
"github.com/cilium/cilium/pkg/identity"
"github.com/cilium/cilium/pkg/mac"
"github.com/cilium/cilium/pkg/option"
"github.com/vishvananda/netlink"
"github.com/vishvananda/netlink/nl"
)
func xdpModeToFlag(xdpMode string) uint32 {
switch xdpMode {
case option.XDPModeNative:
return nl.XDP_FLAGS_DRV_MODE
case option.XDPModeGeneric:
return nl.XDP_FLAGS_SKB_MODE
case option.XDPModeLinkDriver:
return nl.XDP_FLAGS_DRV_MODE
case option.XDPModeLinkGeneric:
return nl.XDP_FLAGS_SKB_MODE
}
return 0
}
// maybeUnloadObsoleteXDPPrograms removes bpf_xdp.o from previously used devices.
func maybeUnloadObsoleteXDPPrograms(xdpDevs []string, xdpMode string) {
links, err := netlink.LinkList()
if err != nil {
log.WithError(err).Warn("Failed to list links for XDP unload")
}
for _, link := range links {
linkxdp := link.Attrs().Xdp
if linkxdp == nil || !linkxdp.Attached {
// No XDP program is attached
continue
}
if strings.Contains(link.Attrs().Name, "cilium") {
// Ignore devices created by cilium-agent
continue
}
used := false
for _, xdpDev := range xdpDevs {
if link.Attrs().Name == xdpDev &&
linkxdp.Flags&xdpModeToFlag(xdpMode) != 0 {
// XDP mode matches; don't unload, otherwise we might introduce
// intermittent connectivity problems
used = true
break
}
}
if !used {
netlink.LinkSetXdpFdWithFlags(link, -1, int(xdpModeToFlag(option.XDPModeLinkGeneric)))
netlink.LinkSetXdpFdWithFlags(link, -1, int(xdpModeToFlag(option.XDPModeLinkDriver)))
}
}
}
// xdpCompileArgs derives compile arguments for bpf_xdp.c.
func xdpCompileArgs(xdpDev string, extraCArgs []string) ([]string, error) {
link, err := netlink.LinkByName(xdpDev)
if err != nil {
return nil, err
}
args := []string{
fmt.Sprintf("-DSECLABEL=%d", identity.ReservedIdentityWorld),
fmt.Sprintf("-DNODE_MAC={.addr=%s}", mac.CArrayString(link.Attrs().HardwareAddr)),
"-DCALLS_MAP=cilium_calls_xdp",
}
args = append(args, extraCArgs...)
if option.Config.EnableNodePort {
args = append(args, []string{
fmt.Sprintf("-DTHIS_MTU=%d", link.Attrs().MTU),
fmt.Sprintf("-DNATIVE_DEV_IFINDEX=%d", link.Attrs().Index),
"-DDISABLE_LOOPBACK_LB",
}...)
}
return args, nil
}
// compileAndLoadXDPProg compiles bpf_xdp.c for the given XDP device and loads it.
func compileAndLoadXDPProg(ctx context.Context, xdpDev, xdpMode string, extraCArgs []string) error {
args, err := xdpCompileArgs(xdpDev, extraCArgs)
if err != nil {
return fmt.Errorf("failed to derive XDP compile extra args: %w", err)
}
dirs := &directoryInfo{
Library: option.Config.BpfDir,
Runtime: option.Config.StateDir,
Output: option.Config.StateDir,
State: option.Config.StateDir,
}
prog := &progInfo{
Source: xdpProg,
Output: xdpObj,
OutputType: outputObject,
Options: args,
}
if err := compile(ctx, prog, dirs); err != nil {
return err
}
if err := ctx.Err(); err != nil {
return err
}
objPath := path.Join(dirs.Output, prog.Output)
return replaceDatapath(ctx, xdpDev, objPath, symbolFromHostNetdevEp, "", true, xdpMode)
}