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xdp: split xdp_loader subcommands into cmd directory
This allows other code to use them as deps, which is impossible as a go_binary. PiperOrigin-RevId: 591054831
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load("//tools:defs.bzl", "go_library") | ||
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package( | ||
default_applicable_licenses = ["//:license"], | ||
licenses = ["notice"], | ||
) | ||
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go_library( | ||
name = "cmd", | ||
srcs = [ | ||
"cmd.go", | ||
"drop.go", | ||
"pass.go", | ||
"redirect_host.go", | ||
"tcpdump.go", | ||
], | ||
embedsrcs = [ | ||
"//tools/xdp/cmd/bpf:drop_ebpf.o", # keep | ||
"//tools/xdp/cmd/bpf:pass_ebpf.o", # keep | ||
"//tools/xdp/cmd/bpf:redirect_host_ebpf.o", # keep | ||
"//tools/xdp/cmd/bpf:tcpdump_ebpf.o", # keep | ||
], | ||
visibility = ["//:sandbox"], | ||
deps = [ | ||
"//pkg/buffer", | ||
"//pkg/tcpip/header", | ||
"//pkg/tcpip/link/sniffer", | ||
"//pkg/tcpip/stack", | ||
"//pkg/xdp", | ||
"//runsc/flag", | ||
"@com_github_cilium_ebpf//:go_default_library", | ||
"@com_github_cilium_ebpf//link:go_default_library", | ||
"@com_github_google_subcommands//:go_default_library", | ||
"@org_golang_x_sys//unix:go_default_library", | ||
], | ||
) |
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Original file line number | Diff line number | Diff line change |
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// Copyright 2022 The gVisor 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. | ||
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//go:build amd64 || arm64 | ||
// +build amd64 arm64 | ||
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// Package cmd implements the subcommands of xdp_loader. | ||
package cmd | ||
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import ( | ||
"bytes" | ||
_ "embed" | ||
"fmt" | ||
"log" | ||
"net" | ||
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"github.com/cilium/ebpf" | ||
"github.com/cilium/ebpf/link" | ||
"golang.org/x/sys/unix" | ||
) | ||
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func runBasicProgram(progData []byte, device string, deviceIndex int) error { | ||
iface, err := getIface(device, deviceIndex) | ||
if err != nil { | ||
return fmt.Errorf("%v", err) | ||
} | ||
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// Load into the kernel. | ||
spec, err := ebpf.LoadCollectionSpecFromReader(bytes.NewReader(progData)) | ||
if err != nil { | ||
return fmt.Errorf("failed to load spec: %v", err) | ||
} | ||
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var objects struct { | ||
Program *ebpf.Program `ebpf:"xdp_prog"` | ||
} | ||
if err := spec.LoadAndAssign(&objects, nil); err != nil { | ||
return fmt.Errorf("failed to load program: %v", err) | ||
} | ||
defer func() { | ||
if err := objects.Program.Close(); err != nil { | ||
fmt.Printf("failed to close program: %v", err) | ||
} | ||
}() | ||
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_, cleanup, err := attach(objects.Program, iface) | ||
if err != nil { | ||
return fmt.Errorf("failed to attach: %v", err) | ||
} | ||
defer cleanup() | ||
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waitForever() | ||
return nil | ||
} | ||
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func getIface(device string, deviceIndex int) (*net.Interface, error) { | ||
switch { | ||
case device != "" && deviceIndex != 0: | ||
return nil, fmt.Errorf("device specified twice") | ||
case device != "": | ||
iface, err := net.InterfaceByName(device) | ||
if err != nil { | ||
return nil, fmt.Errorf("unknown device %q: %v", device, err) | ||
} | ||
return iface, nil | ||
case deviceIndex != 0: | ||
iface, err := net.InterfaceByIndex(deviceIndex) | ||
if err != nil { | ||
return nil, fmt.Errorf("unknown device with index %d: %v", deviceIndex, err) | ||
} | ||
return iface, nil | ||
default: | ||
return nil, fmt.Errorf("no device specified") | ||
} | ||
} | ||
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func attach(program *ebpf.Program, iface *net.Interface) (link.Link, func(), error) { | ||
// Attach the program to the XDP hook on the device. Fallback from best | ||
// to worst mode. | ||
modes := []struct { | ||
name string | ||
flag link.XDPAttachFlags | ||
}{ | ||
{name: "offload", flag: link.XDPOffloadMode}, | ||
{name: "driver", flag: link.XDPDriverMode}, | ||
{name: "generic", flag: link.XDPGenericMode}, | ||
} | ||
var attached link.Link | ||
var err error | ||
for _, mode := range modes { | ||
attached, err = link.AttachXDP(link.XDPOptions{ | ||
Program: program, | ||
Interface: iface.Index, | ||
Flags: mode.flag, | ||
}) | ||
if err == nil { | ||
log.Printf("attached with mode %q", mode.name) | ||
break | ||
} | ||
log.Printf("failed to attach with mode %q: %v", mode.name, err) | ||
} | ||
if attached == nil { | ||
return nil, nil, fmt.Errorf("failed to attach program") | ||
} | ||
return attached, func() { attached.Close() }, nil | ||
} | ||
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func waitForever() { | ||
log.Printf("Successfully attached! Press CTRL-C to quit and remove the program from the device.") | ||
for { | ||
unix.Pause() | ||
} | ||
} |
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