diff options
Diffstat (limited to 'vendor/github.com/google/gopacket/afpacket/options.go')
| -rw-r--r-- | vendor/github.com/google/gopacket/afpacket/options.go | 171 |
1 files changed, 0 insertions, 171 deletions
diff --git a/vendor/github.com/google/gopacket/afpacket/options.go b/vendor/github.com/google/gopacket/afpacket/options.go deleted file mode 100644 index c5ab771..0000000 --- a/vendor/github.com/google/gopacket/afpacket/options.go +++ /dev/null @@ -1,171 +0,0 @@ -// Copyright 2012 Google, Inc. All rights reserved. -// -// Use of this source code is governed by a BSD-style license -// that can be found in the LICENSE file in the root of the source -// tree. - -// +build linux - -package afpacket - -import ( - "errors" - "fmt" - "time" -) - -// #include <linux/if_packet.h> -// #include <sys/socket.h> -import "C" - -// OptTPacketVersion is the version of TPacket to use. -// It can be passed into NewTPacket. -type OptTPacketVersion int - -// String returns a string representation of the version, generally of the form V#. -func (t OptTPacketVersion) String() string { - switch t { - case TPacketVersion1: - return "V1" - case TPacketVersion2: - return "V2" - case TPacketVersion3: - return "V3" - case TPacketVersionHighestAvailable: - return "HighestAvailable" - } - return "InvalidVersion" -} - -// OptSocketType is the socket type used to open the TPacket socket. -type OptSocketType int - -func (t OptSocketType) String() string { - switch t { - case SocketRaw: - return "SOCK_RAW" - case SocketDgram: - return "SOCK_DGRAM" - } - return "UnknownSocketType" -} - -// TPacket version numbers for use with NewHandle. -const ( - // TPacketVersionHighestAvailable tells NewHandle to use the highest available version of tpacket the kernel has available. - // This is the default, should a version number not be given in NewHandle's options. - TPacketVersionHighestAvailable = OptTPacketVersion(-1) - TPacketVersion1 = OptTPacketVersion(C.TPACKET_V1) - TPacketVersion2 = OptTPacketVersion(C.TPACKET_V2) - TPacketVersion3 = OptTPacketVersion(C.TPACKET_V3) - tpacketVersionMax = TPacketVersion3 - tpacketVersionMin = -1 - // SocketRaw is the default socket type. It returns packet data - // including the link layer (ethernet headers, etc). - SocketRaw = OptSocketType(C.SOCK_RAW) - // SocketDgram strips off the link layer when reading packets, and adds - // the link layer back automatically on packet writes (coming soon...) - SocketDgram = OptSocketType(C.SOCK_DGRAM) -) - -// OptInterface is the specific interface to bind to. -// It can be passed into NewTPacket. -type OptInterface string - -// OptFrameSize is TPacket's tp_frame_size -// It can be passed into NewTPacket. -type OptFrameSize int - -// OptBlockSize is TPacket's tp_block_size -// It can be passed into NewTPacket. -type OptBlockSize int - -// OptNumBlocks is TPacket's tp_block_nr -// It can be passed into NewTPacket. -type OptNumBlocks int - -// OptBlockTimeout is TPacket v3's tp_retire_blk_tov. Note that it has only millisecond granularity, so must be >= 1 ms. -// It can be passed into NewTPacket. -type OptBlockTimeout time.Duration - -// OptPollTimeout is the number of milliseconds that poll() should block waiting for a file -// descriptor to become ready. Specifying a negative value in time‐out means an infinite timeout. -type OptPollTimeout time.Duration - -// Default constants used by options. -const ( - DefaultFrameSize = 4096 // Default value for OptFrameSize. - DefaultBlockSize = DefaultFrameSize * 128 // Default value for OptBlockSize. - DefaultNumBlocks = 128 // Default value for OptNumBlocks. - DefaultBlockTimeout = 64 * time.Millisecond // Default value for OptBlockTimeout. - DefaultPollTimeout = -1 * time.Millisecond // Default value for OptPollTimeout. This blocks forever. -) - -type options struct { - frameSize int - framesPerBlock int - blockSize int - numBlocks int - blockTimeout time.Duration - pollTimeout time.Duration - version OptTPacketVersion - socktype OptSocketType - iface string -} - -var defaultOpts = options{ - frameSize: DefaultFrameSize, - blockSize: DefaultBlockSize, - numBlocks: DefaultNumBlocks, - blockTimeout: DefaultBlockTimeout, - pollTimeout: DefaultPollTimeout, - version: TPacketVersionHighestAvailable, - socktype: SocketRaw, -} - -func parseOptions(opts ...interface{}) (ret options, err error) { - ret = defaultOpts - for _, opt := range opts { - switch v := opt.(type) { - case OptFrameSize: - ret.frameSize = int(v) - case OptBlockSize: - ret.blockSize = int(v) - case OptNumBlocks: - ret.numBlocks = int(v) - case OptBlockTimeout: - ret.blockTimeout = time.Duration(v) - case OptPollTimeout: - ret.pollTimeout = time.Duration(v) - case OptTPacketVersion: - ret.version = v - case OptInterface: - ret.iface = string(v) - case OptSocketType: - ret.socktype = v - default: - err = errors.New("unknown type in options") - return - } - } - if err = ret.check(); err != nil { - return - } - ret.framesPerBlock = ret.blockSize / ret.frameSize - return -} -func (o options) check() error { - switch { - case o.blockSize%pageSize != 0: - return fmt.Errorf("block size %d must be divisible by page size %d", o.blockSize, pageSize) - case o.blockSize%o.frameSize != 0: - return fmt.Errorf("block size %d must be divisible by frame size %d", o.blockSize, o.frameSize) - case o.numBlocks < 1: - return fmt.Errorf("num blocks %d must be >= 1", o.numBlocks) - case o.blockTimeout < time.Millisecond: - return fmt.Errorf("block timeout %v must be > %v", o.blockTimeout, time.Millisecond) - case o.version < tpacketVersionMin || o.version > tpacketVersionMax: - return fmt.Errorf("tpacket version %v is invalid", o.version) - } - return nil -} |