sensors

package
v0.8.20 Latest Latest
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 Go to latest Published: Mar 14, 2023 License: Apache-2.0 Imports: 23 Imported by: 0

Documentation

Overview

SPDX-License-Identifier: Apache-2.0 Copyright Authors of Tetragon

SPDX-License-Identifier: Apache-2.0 Copyright Authors of Tetragon

SPDX-License-Identifier: Apache-2.0 Copyright Authors of Tetragon

Index

Constants

View Source 
const (
	BPF_PROG_TYPE_UNSPEC                  = 0
	BPF_PROG_TYPE_SOCKET_FILTER           = 1
	BPF_PROG_TYPE_KPROBE                  = 2
	BPF_PROG_TYPE_SCHED_CLS               = 3
	BPF_PROG_TYPE_SCHED_ACT               = 4
	BPF_PROG_TYPE_TRACEPOINT              = 5
	BPF_PROG_TYPE_XDP                     = 6
	BPF_PROG_TYPE_PERF_EVENT              = 7
	BPF_PROG_TYPE_CGROUP_SKB              = 8
	BPF_PROG_TYPE_CGROUP_SOCK             = 9
	BPF_PROG_TYPE_LWT_IN                  = 10
	BPF_PROG_TYPE_LWT_OUT                 = 11
	BPF_PROG_TYPE_LWT_XMIT                = 12
	BPF_PROG_TYPE_SOCK_OPS                = 13
	BPF_PROG_TYPE_SK_SKB                  = 14
	BPF_PROG_TYPE_CGROUP_DEVICE           = 15
	BPF_PROG_TYPE_SK_MSG                  = 16
	BPF_PROG_TYPE_RAW_TRACEPOINT          = 17
	BPF_PROG_TYPE_CGROUP_SOCK_ADDR        = 18
	BPF_PROG_TYPE_LWT_SEG6LOCAL           = 19
	BPF_PROG_TYPE_LIRC_MODE2              = 20
	BPF_PROG_TYPE_SK_REUSEPORT            = 21
	BPF_PROG_TYPE_FLOW_DISSECTOR          = 22
	BPF_PROG_TYPE_CGROUP_SYSCTL           = 23
	BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE = 24
	BPF_PROG_TYPE_CGROUP_SOCKOPT          = 25
	BPF_PROG_TYPE_TRACING                 = 26
	BPF_PROG_TYPE_STRUCT_OPS              = 27
	BPF_PROG_TYPE_EXT                     = 28
	BPF_PROG_TYPE_LSM                     = 29
)

Variables

View Source 
var (
	// AllPrograms are all the loaded programs. For use with Unload().
	AllPrograms = []*program.Program{}
	// AllMaps are all the loaded programs. For use with Unload().
	AllMaps = []*program.Map{}
)

Functions

func LoadConfig 

func LoadConfig(ctx context.Context, bpfDir, mapDir, ciliumDir string, sens []*Sensor) error

LoadConfig loads the default sensor, including any from the configuration file.

func PathJoin 

func PathJoin(elem ...string) string

PathJoin creates a path meant for sensor filenames in /sys/fs/bpf.

At some point, we would like to have a file hierarchy under /sys/fs/bpf for each sensor. see: https://github.com/go-faster/tetragon/issues/408

Unfortunately, this requires changes, for properly creating and deleting these directories requires. As an intermediate step, we use this function that uses dashes instead of / to create unique files in flat hierarchy, without needeing to manage directories.

func RegisterPolicyHandlerAtInit added in v0.8.20 

func RegisterPolicyHandlerAtInit(name string, h policyHandler)

RegisterPolicyHandlerAtInit registers a handler for a tracing policy.

func RegisterProbeType 

func RegisterProbeType(probeType string, s probeLoader)

RegisterProbeType registers a handler for a probe type string

This function is meant to be called in an init() by sensors that need extra logic when loading a specific probe type.

func RegisterSpecHandlerAtInit 

func RegisterSpecHandlerAtInit(name string, s specHandler)

RegisterSpecHandlerAtInit registers a handler for Tracing policy. NB: This is deprecated, please use RegisterPolicyHandlerAtInit for new code.

This function is meant to be called in an init(). This will register a CRD or config file handler so that the config file or CRDs will be passed to the handler to be parsed.

func UnloadAll 

func UnloadAll(bpfDir string)

func UpdateStatsMap 

func UpdateStatsMap(m *ebpf.Map, val int64) error

Types

type LoadArg 

type LoadArg struct {
	STTManagerHandle sttManager.Handle
}

type LoadProbeArgs 

type LoadProbeArgs struct {
	BPFDir, MapDir, CiliumDir string
	Load                      *program.Program
	Version, Verbose          int
}

LoadProbeArgs are the args to the LoadProbe function.

type Manager 

type Manager struct {
	STTManager sttManager.Handle
	// contains filtered or unexported fields
}

Manager handles dynamic sensor management, such as adding / removing sensors at runtime.

func StartSensorManager 

func StartSensorManager(bpfDir, mapDir, ciliumDir string) (*Manager, error)

StartSensorManager initializes the sensorCtlHandle by spawning a sensor controller goroutine.

The purpose of this goroutine is to serialize loading and unloading of sensors as requested from different goroutines (e.g., different GRPC clients).

func (*Manager) AddSensor 

func (h *Manager) AddSensor(ctx context.Context, name string, sensor *Sensor) error

AddSensor adds a sensor

func (*Manager) AddTracingPolicy 

func (h *Manager) AddTracingPolicy(ctx context.Context, tp tracingpolicy.TracingPolicy) error

AddTracingPolicy adds a new sensor based on a tracing policy NB: if tp implements tracingpolicy.TracingPolicyNamespaced, it will be treated as a namespaced policy

func (*Manager) DelTracingPolicy 

func (h *Manager) DelTracingPolicy(ctx context.Context, name string) error

DelTracingPolicy deletes a new sensor based on a tracing policy

func (*Manager) DisableSensor 

func (h *Manager) DisableSensor(ctx context.Context, name string) error

DisableSensor disables a sensor by name

func (*Manager) EnableSensor 

func (h *Manager) EnableSensor(ctx context.Context, name string) error

EnableSensor enables a sensor by name

func (*Manager) GetSensorConfig 

func (h *Manager) GetSensorConfig(ctx context.Context, name string, cfgkey string) (string, error)

func (*Manager) ListSensors 

func (h *Manager) ListSensors(ctx context.Context) (*[]SensorStatus, error)

func (*Manager) ListTracingPolicies added in v0.8.20 

func (h *Manager) ListTracingPolicies(ctx context.Context) (*tetragon.ListTracingPoliciesResponse, error)

ListTracingPolicies returns a list of the active tracing policies

func (*Manager) LogSensorsAndProbes 

func (h *Manager) LogSensorsAndProbes(ctx context.Context)

func (*Manager) RemoveSensor 

func (h *Manager) RemoveSensor(ctx context.Context, sensorName string) error

func (*Manager) SetSensorConfig 

func (h *Manager) SetSensorConfig(ctx context.Context, name string, cfgkey string, cfgval string) error

func (*Manager) StopSensorManager 

func (h *Manager) StopSensorManager(ctx context.Context) error

type Operations 

type Operations interface {
	Loaded(arg LoadArg)
	Unloaded(arg UnloadArg)

	GetConfig(cfg string) (string, error)
	SetConfig(cfg string, val string) error
}

Operations is the interface to the underlying sensor implementations.

type Sensor 

type Sensor struct {
	// Name is a human-readbale description.
	Name string
	// Progs are all the BPF programs that exist on the filesystem.
	Progs []*program.Program
	// Maps are all the BPF Maps that the progs use.
	Maps []*program.Map
	// Loaded indicates whether the sensor has been Loaded.
	Loaded bool
	// Ops contains an implementation to perform on this sensor.
	Ops Operations
	// UnloadHook can optionally contain a pointer to a function to be
	// called during sensor unloading, prior to the programs and maps being
	// unloaded.
	UnloadHook SensorUnloadHook
}

Sensor is a set of BPF programs and maps that are managed as a unit.

NB: We need to rethink the Ops field. See manager main loop for some discussion on this. If we decide to keep them, we should merge them with the UnloadHook since the two are similar: ops.Unloaded is called when a sensor is successfully unloaded, while UnloadHook is called during unloading.

func GetMergedSensorFromParserPolicy 

func GetMergedSensorFromParserPolicy(tp tracingpolicy.TracingPolicy) (*Sensor, error)

func SensorBuilder 

func SensorBuilder(name string, p []*program.Program, m []*program.Map) *Sensor

func SensorCombine 

func SensorCombine(name string, sensors ...*Sensor) *Sensor

func SensorsFromPolicy added in v0.8.20 

func SensorsFromPolicy(tp tracingpolicy.TracingPolicy, filterID policyfilter.PolicyID) ([]*Sensor, error)

revive:disable:exported

func (*Sensor) FindPrograms 

func (s *Sensor) FindPrograms(ctx context.Context) error

FindPrograms finds all the BPF programs in the sensor on the filesytem.

func (*Sensor) Load 

func (s *Sensor) Load(stopCtx context.Context, bpfDir, mapDir, ciliumDir string) error

Load loads the sensor, by loading all the BPF programs and maps.

func (*Sensor) Unload 

func (s *Sensor) Unload() error

type SensorStatus 

type SensorStatus struct {
	Name       string
	Enabled    bool
	Collection string
}

type SensorUnloadHook 

type SensorUnloadHook func() error

SensorUnloadHook is the function signature for an optional function that can be called during sensor unloading.

type TracingPolicy 

type TracingPolicy interface {
	// TpName returns the name of the policy.
	TpName() string
	// TpSpec  returns the specification of the policy
	TpSpec() *v1alpha1.TracingPolicySpec
	// TpInfo returns a description of the policy
	TpInfo() string
}

TracingPolicy is an interface for a tracing policy This is implemented by v1alpha1.types.TracingPolicy and config.GenericTracingConf. The former is what is the k8s API server uses, and the latter is used when we load files directly (e.g., via the cli).

type UnloadArg 

type UnloadArg = LoadArg

Source Files

View all Source files

Directories

Path Synopsis
cgroup
cgrouptrackmap
config
confmap
SPDX-License-Identifier: Apache-2.0 Copyright Authors of Tetragon
 SPDX-License-Identifier: Apache-2.0 Copyright Authors of Tetragon
execvemap
procevents
SPDX-License-Identifier: Apache-2.0 Copyright Authors of Tetragon
 SPDX-License-Identifier: Apache-2.0 Copyright Authors of Tetragon
cgroup
SPDX-License-Identifier: Apache-2.0 Copyright Authors of Tetragon
 SPDX-License-Identifier: Apache-2.0 Copyright Authors of Tetragon
SPDX-License-Identifier: Apache-2.0 Copyright Authors of Tetragon
 SPDX-License-Identifier: Apache-2.0 Copyright Authors of Tetragon
SPDX-License-Identifier: Apache-2.0 Copyright Authors of Tetragon
 SPDX-License-Identifier: Apache-2.0 Copyright Authors of Tetragon

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