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4de643b714
There is a finite limit to the maximum message size that logtail can upload. We need to make sure network logging messages remain under this size. These constants allow us to compute the maximum number of ConnectionCounts we can buffer before we must flush. Signed-off-by: Joe Tsai <joetsai@digital-static.net>
93 lines
3.8 KiB
Go
93 lines
3.8 KiB
Go
// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package netlogtype defines types for network logging.
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package netlogtype
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import (
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"net/netip"
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"time"
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"tailscale.com/tailcfg"
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"tailscale.com/types/ipproto"
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)
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// TODO(joetsai): Remove "omitempty" if "omitzero" is ever supported in both
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// the v1 and v2 "json" packages.
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// Message is the log message that captures network traffic.
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type Message struct {
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NodeID tailcfg.StableNodeID `json:"nodeId" cbor:"0,keyasint"` // e.g., "n123456CNTRL"
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Start time.Time `json:"start" cbor:"12,keyasint"` // inclusive
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End time.Time `json:"end" cbor:"13,keyasint"` // inclusive
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VirtualTraffic []ConnectionCounts `json:"virtualTraffic,omitempty" cbor:"14,keyasint,omitempty"`
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SubnetTraffic []ConnectionCounts `json:"subnetTraffic,omitempty" cbor:"15,keyasint,omitempty"`
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ExitTraffic []ConnectionCounts `json:"exitTraffic,omitempty" cbor:"16,keyasint,omitempty"`
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PhysicalTraffic []ConnectionCounts `json:"physicalTraffic,omitempty" cbor:"17,keyasint,omitempty"`
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}
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const (
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maxJSONConnCounts = `{` + maxJSONConn + `,` + maxJSONCounts + `}`
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maxJSONConn = `"proto":` + maxJSONProto + `,"src":` + maxJSONAddrPort + `,"dst":` + maxJSONAddrPort
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maxJSONProto = `255`
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maxJSONAddrPort = `"[ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff]:65535"`
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maxJSONCounts = `"txPkts":` + maxJSONCount + `,"txBytes":` + maxJSONCount + `,"rxPkts":` + maxJSONCount + `,"rxBytes":` + maxJSONCount
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maxJSONCount = `18446744073709551615`
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// MaxConnectionCountsJSONSize is the maximum size of a ConnectionCounts
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// when it is serialized as JSON, assuming no superfluous whitespace.
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// It does not include the trailing comma that often appears when
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// this object is nested within an array.
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// It assumes that netip.Addr never has IPv6 zones.
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MaxConnectionCountsJSONSize = len(maxJSONConnCounts)
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maxCBORConnCounts = "\xbf" + maxCBORConn + maxCBORCounts + "\xff"
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maxCBORConn = "\x00" + maxCBORProto + "\x01" + maxCBORAddrPort + "\x02" + maxCBORAddrPort
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maxCBORProto = "\x18\xff"
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maxCBORAddrPort = "\x52\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"
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maxCBORCounts = "\x0c" + maxCBORCount + "\x0d" + maxCBORCount + "\x0e" + maxCBORCount + "\x0f" + maxCBORCount
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maxCBORCount = "\x1b\xff\xff\xff\xff\xff\xff\xff\xff"
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// MaxConnectionCountsCBORSize is the maximum size of a ConnectionCounts
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// when it is serialized as CBOR.
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// It assumes that netip.Addr never has IPv6 zones.
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MaxConnectionCountsCBORSize = len(maxCBORConnCounts)
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)
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// ConnectionCounts is a flattened struct of both a connection and counts.
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type ConnectionCounts struct {
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Connection
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Counts
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}
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// Connection is a 5-tuple of proto, source and destination IP and port.
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type Connection struct {
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Proto ipproto.Proto `json:"proto,omitzero,omitempty" cbor:"0,keyasint,omitempty"`
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Src netip.AddrPort `json:"src,omitzero,omitempty" cbor:"1,keyasint,omitempty"`
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Dst netip.AddrPort `json:"dst,omitzero,omitempty" cbor:"2,keyasint,omitempty"`
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}
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func (c Connection) IsZero() bool { return c == Connection{} }
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// Counts are statistics about a particular connection.
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type Counts struct {
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TxPackets uint64 `json:"txPkts,omitzero,omitempty" cbor:"12,keyasint,omitempty"`
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TxBytes uint64 `json:"txBytes,omitzero,omitempty" cbor:"13,keyasint,omitempty"`
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RxPackets uint64 `json:"rxPkts,omitzero,omitempty" cbor:"14,keyasint,omitempty"`
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RxBytes uint64 `json:"rxBytes,omitzero,omitempty" cbor:"15,keyasint,omitempty"`
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}
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func (c Counts) IsZero() bool { return c == Counts{} }
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// Add adds the counts from both c1 and c2.
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func (c1 Counts) Add(c2 Counts) Counts {
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c1.TxPackets += c2.TxPackets
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c1.TxBytes += c2.TxBytes
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c1.RxPackets += c2.RxPackets
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c1.RxBytes += c2.RxBytes
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return c1
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}
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