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fq/format/inet/icmpv6.go

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package inet
import (
"github.com/wader/fq/format"
"github.com/wader/fq/pkg/decode"
"github.com/wader/fq/pkg/interp"
"github.com/wader/fq/pkg/scalar"
)
func init() {
interp.RegisterFormat(
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format.ICMPv6,
&decode.Format{
Description: "Internet Control Message Protocol v6",
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Groups: []*decode.Group{format.IP_Packet},
DecodeFn: decodeICMPv6,
})
}
// based on https://en.wikipedia.org/wiki/Internet_Control_Message_Protocol_for_IPv6
var icmpv6TypeMap = scalar.UintMap{
1: {Sym: "unreachable", Description: "Destination unreachable"},
2: {Sym: "too_big", Description: "Packet too big"},
3: {Sym: "time_exceeded", Description: "Time exceeded"},
4: {Sym: "parameter_problem", Description: "Parameter problem"},
100: {Description: "Private experimentation"},
101: {Description: "Private experimentation"},
127: {Description: "Reserved for expansion of ICMPv6 error messages"},
128: {Sym: "echo_reply", Description: "Echo Request"},
129: {Sym: "echo_request", Description: "Echo Reply"},
130: {Description: "Multicast Listener Query (MLD)"},
131: {Description: "Multicast Listener Report (MLD)"},
132: {Description: "Multicast Listener Done (MLD)"},
133: {Description: "Router Solicitation (NDP)"},
134: {Description: "Router Advertisement (NDP)"},
135: {Description: "Neighbor Solicitation (NDP)"},
136: {Description: "Neighbor Advertisement (NDP)"},
137: {Description: "Redirect Message (NDP)"},
138: {Description: "Router Renumbering Router Renumbering Command"},
139: {Description: "ICMP Node Information Query"},
140: {Description: "ICMP Node Information Response"},
141: {Description: "Inverse Neighbor Discovery Solicitation Message"},
142: {Description: "Inverse Neighbor Discovery Advertisement Message"},
143: {Description: "Multicast Listener Discovery (MLDv2) reports (RFC 3810)"},
144: {Description: "Home Agent Address Discovery Request Message"},
145: {Description: "Home Agent Address Discovery Reply Message"},
146: {Description: "Mobile Prefix Solicitation"},
147: {Description: "Mobile Prefix Advertisement"},
148: {Description: "Certification Path Solicitation (SEND)"},
149: {Description: "Certification Path Advertisement (SEND)"},
151: {Description: "Multicast Router Advertisement (MRD)"},
152: {Description: "Multicast Router Solicitation (MRD)"},
153: {Description: "Multicast Router Termination (MRD)"},
155: {Description: "RPL Control Message"},
200: {Description: "Private experimentation"},
201: {Description: "Private experimentation"},
255: {Description: "Reserved for expansion of ICMPv6 informational messages"},
}
var icmpv6CodeMapMap = map[uint64]scalar.UintMapDescription{
1: {
1: "Communication with destination administratively prohibited",
2: "Beyond scope of source address",
3: "Address unreachable",
4: "Port unreachable",
5: "Source address failed ingress/egress policy",
6: "Reject route to destination",
7: "Error in Source Routing Header",
},
3: {
0: "Hop limit exceeded in transit",
1: "Fragment reassembly time exceeded",
},
4: {
0: "Erroneous header field encountered",
1: "Unrecognized Next Header type encountered",
2: "Unrecognized IPv6 option encountered",
},
}
func decodeICMPv6(d *decode.D) any {
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var ipi format.IP_Packet_In
if d.ArgAs(&ipi) && ipi.Protocol != format.IPv4ProtocolICMPv6 {
d.Fatalf("incorrect protocol %d", ipi.Protocol)
}
typ := d.FieldU8("type", icmpv6TypeMap)
d.FieldU8("code", icmpv6CodeMapMap[typ])
d.FieldU16("checksum")
d.FieldRawLen("content", d.BitsLeft())
return nil
}