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Fix BPF Filter

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This commit is contained in:
Kioubit 2021-12-24 18:04:09 -05:00
parent 8562c2f533
commit bef2b5d3ef
1 changed files with 4 additions and 4 deletions
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8
pndp/rawsocket.go
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@ -85,16 +85,16 @@ func listen(iface string, responder chan *ndpRequest, requestType ndpType, stopW
//Neighbor Advertisement
protocolNo = 0x88
}
var f bpfFilter = []bpf.Instruction{
var f bpfFilter
f = []bpf.Instruction{
// Load "EtherType" field from the ethernet header.
bpf.LoadAbsolute{Off: 12, Size: 2},
// Jump to the drop packet instruction if EtherType is not IPv6.
bpf.JumpIf{Cond: bpf.JumpNotEqual, Val: 0x86dd, SkipTrue: 4},
bpf.JumpIf{Cond: bpf.JumpNotEqual, Val: 0x86dd, SkipTrue: 5},
// Load "Next Header" field from IPV6 header.
bpf.LoadAbsolute{Off: 20, Size: 1},
// Jump to the drop packet instruction if Next Header is not ICMPv6.
bpf.JumpIf{Cond: bpf.JumpNotEqual, Val: 0x3a, SkipTrue: 2},
bpf.JumpIf{Cond: bpf.JumpNotEqual, Val: 0x3a, SkipTrue: 3},
// Load "Type" field from ICMPv6 header.
bpf.LoadAbsolute{Off: 54, Size: 1},
// Jump to the drop packet instruction if Type is not Neighbor Solicitation / Advertisement.