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Kernel: Record MAC addresses for incoming IPv4 packets

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This way we don't have to do ARP just to send packets back to
an address which just sent us a packet.
This commit is contained in:
Gunnar Beutner 2021-04-30 22:07:41 +02:00 committed by Andreas Kling
parent fb2ad94195
commit c03cbf83ab
Notes: sideshowbarker 2024-07-18 18:51:14 +09:00 
Author: https://github.com/gunnarbeutner
Commit: https://github.com/SerenityOS/serenity/commit/c03cbf83abc
Pull-request: https://github.com/SerenityOS/serenity/pull/6762
1 changed files with 9 additions and 0 deletions
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9
Kernel/Net/NetworkTask.cpp
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@ -183,6 +183,15 @@ void handle_ipv4(const EthernetFrameHeader& eth, size_t frame_size, const Time&
dbgln_if(IPV4_DEBUG, "handle_ipv4: source={}, destination={}", packet.source(), packet.destination());
NetworkAdapter::for_each([&](auto& adapter) {
if (adapter.link_up()) {
auto my_net = adapter.ipv4_address().to_u32() & adapter.ipv4_netmask().to_u32();
auto their_net = packet.source().to_u32() & adapter.ipv4_netmask().to_u32();
if (my_net == their_net)
update_arp_table(packet.source(), eth.source());
}
});
switch ((IPv4Protocol)packet.protocol()) {
case IPv4Protocol::ICMP:
return handle_icmp(eth, packet, packet_timestamp);