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Kernel: Make sure outgoing ICMP packets have the correct checksum

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The internet_checksum() function relies on the buffer - or at least the
checksum field - to be all zeroes.
This commit is contained in:
Gunnar Beutner
2021-06-03 19:04:41 +02:00
committed by Andreas Kling
parent c4c577b2bf
commit 7f7897c900
1 changed files with 1 additions and 0 deletions
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Kernel/Net/NetworkTask.cpp
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@@ -253,6 +253,7 @@ void handle_icmp(const EthernetFrameHeader& eth, const IPv4Packet& ipv4_packet,
return; return;
} }
adapter->fill_in_ipv4_header(*packet, adapter->ipv4_address(), eth.source(), ipv4_packet.source(), IPv4Protocol::ICMP, icmp_packet_size, 64); adapter->fill_in_ipv4_header(*packet, adapter->ipv4_address(), eth.source(), ipv4_packet.source(), IPv4Protocol::ICMP, icmp_packet_size, 64);
memset(packet->buffer.data() + ipv4_payload_offset, 0, sizeof(ICMPEchoPacket));
auto& response = *(ICMPEchoPacket*)(packet->buffer.data() + ipv4_payload_offset); auto& response = *(ICMPEchoPacket*)(packet->buffer.data() + ipv4_payload_offset);
response.header.set_type(ICMPType::EchoReply); response.header.set_type(ICMPType::EchoReply);
response.header.set_code(0); response.header.set_code(0);