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54 lines
1.3 KiB
Go
54 lines
1.3 KiB
Go
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// Copyright (c) 2020 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 packet
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// IPProto is an IP subprotocol as defined by the IANA protocol
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// numbers list
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// (https://www.iana.org/assignments/protocol-numbers/protocol-numbers.xhtml),
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// or the special values Unknown or Fragment.
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type IPProto uint8
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const (
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// Unknown represents an unknown or unsupported protocol; it's
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// deliberately the zero value. Strictly speaking the zero
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// value is IPv6 hop-by-hop extensions, but we don't support
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// those, so this is still technically correct.
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Unknown IPProto = 0x00
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// Values from the IANA registry.
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ICMPv4 IPProto = 0x01
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IGMP IPProto = 0x02
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ICMPv6 IPProto = 0x3a
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TCP IPProto = 0x06
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UDP IPProto = 0x11
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// Fragment represents any non-first IP fragment, for which we
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// don't have the sub-protocol header (and therefore can't
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// figure out what the sub-protocol is).
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//
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// 0xFF is reserved in the IANA registry, so we steal it for
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// internal use.
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Fragment IPProto = 0xFF
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)
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func (p IPProto) String() string {
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switch p {
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case Fragment:
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return "Frag"
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case ICMPv4:
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return "ICMPv4"
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case IGMP:
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return "IGMP"
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case ICMPv6:
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return "ICMPv6"
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case UDP:
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return "UDP"
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case TCP:
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return "TCP"
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default:
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return "Unknown"
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}
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}
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