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Kernel: Route packets destined for us through the loopback adapter

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Without this patch we'd send packets through the physical adapter
and they'd incorrectly end up on the network.
This commit is contained in:
Gunnar Beutner 2021-05-12 14:43:14 +02:00 • committed by Andreas Kling
parent 2b6aa571d1
commit 790d68ac5e
1 changed files with 8 additions and 0 deletions
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8
Kernel/Net/Routing.cpp
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@ -156,6 +156,11 @@ RoutingDecision route_to(const IPv4Address& target, const IPv4Address& source, c
auto adapter_addr = adapter.ipv4_address().to_u32();
auto adapter_mask = adapter.ipv4_netmask().to_u32();
if (target_addr == adapter_addr) {
local_adapter = LoopbackAdapter::the();
return;
}
if (source_addr != 0 && source_addr != adapter_addr)
return;
@ -205,6 +210,9 @@ RoutingDecision route_to(const IPv4Address& target, const IPv4Address& source, c
if (target_addr == 0xffffffff && matches(adapter))
return { adapter, { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff } };
if (adapter == LoopbackAdapter::the())
return { adapter, adapter->mac_address() };
if ((target_addr & IPv4Address { 240, 0, 0, 0 }.to_u32()) == IPv4Address { 224, 0, 0, 0 }.to_u32())
return { adapter, multicast_ethernet_address(target) };