diff options
Diffstat (limited to 'pkg/tcpip/network/ipv4')
| -rw-r--r-- | pkg/tcpip/network/ipv4/icmp.go | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/pkg/tcpip/network/ipv4/icmp.go b/pkg/tcpip/network/ipv4/icmp.go index 284ad89cf..6bb97c46a 100644 --- a/pkg/tcpip/network/ipv4/icmp.go +++ b/pkg/tcpip/network/ipv4/icmp.go @@ -436,13 +436,13 @@ func (p *protocol) returnError(reason icmpReason, pkt *stack.PacketBuffer) *tcpi // systems implement the RFC 1812 definition and not the original // requirement. We treat 8 bytes as the minimum but will try send more. mtu := int(route.MTU()) - if mtu > header.IPv4MinimumProcessableDatagramSize { - mtu = header.IPv4MinimumProcessableDatagramSize + const maxIPData = header.IPv4MinimumProcessableDatagramSize - header.IPv4MinimumSize + if mtu > maxIPData { + mtu = maxIPData } - headerLen := int(route.MaxHeaderLength()) + header.ICMPv4MinimumSize - available := int(mtu) - headerLen + available := mtu - header.ICMPv4MinimumSize - if available < header.IPv4MinimumSize+header.ICMPv4MinimumErrorPayloadSize { + if available < len(origIPHdr)+header.ICMPv4MinimumErrorPayloadSize { return nil } @@ -465,7 +465,7 @@ func (p *protocol) returnError(reason icmpReason, pkt *stack.PacketBuffer) *tcpi payload.CapLength(payloadLen) icmpPkt := stack.NewPacketBuffer(stack.PacketBufferOptions{ - ReserveHeaderBytes: headerLen, + ReserveHeaderBytes: int(route.MaxHeaderLength()) + header.ICMPv4MinimumSize, Data: payload, }) |