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TUN-6592: Decrement TTL and return ICMP time exceed if it's 0

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This commit is contained in:
cthuang
2022-09-13 14:00:54 +01:00
parent f5f3e6a453
commit 8a53c1aa1d
18 changed files with 515 additions and 106 deletions
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4
packet/decoder.go
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@@ -16,8 +16,8 @@ func FindProtocol(p []byte) (layers.IPProtocol, error) {
}
switch version {
case 4:
if len(p) < ipv4HeaderLen {
return 0, fmt.Errorf("IPv4 packet should have at least %d bytes, got %d bytes", ipv4HeaderLen, len(p))
if len(p) < ipv4MinHeaderLen {
return 0, fmt.Errorf("IPv4 packet should have at least %d bytes, got %d bytes", ipv4MinHeaderLen, len(p))
}
// Protocol is in the 10th byte of IPv4 header
return layers.IPProtocol(p[9]), nil