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Kernel: Add the SO_BINDTODEVICE socket option

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This patch adds a way for a socket to ask to be routed through a
specific interface.
Currently, this option only applies to sending, however, it should also
apply to receiving...somehow :^)
This commit is contained in:
AnotherTest 2020-04-05 01:16:45 +04:30 • committed by Andreas Kling
parent 7d0bf9b5a9
commit 77191d82dc
10 changed files with 186 additions and 13 deletions
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22
Kernel/Net/Routing.cpp
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@ -46,10 +46,22 @@ bool RoutingDecision::is_zero() const
return adapter.is_null() || next_hop.is_zero();
}
RoutingDecision route_to(const IPv4Address& target, const IPv4Address& source)
RoutingDecision route_to(const IPv4Address& target, const IPv4Address& source, const RefPtr<NetworkAdapter> through)
{
auto matches = [&](auto& adapter) {
if (!through)
return true;
return through == adapter;
};
auto if_matches = [&](auto& adapter, const auto& mac) -> RoutingDecision {
if (!matches(adapter))
return { nullptr, {} };
return { adapter, mac };
};
if (target[0] == 127)
return { LoopbackAdapter::the(), LoopbackAdapter::the().mac_address() };
return if_matches(LoopbackAdapter::the(), LoopbackAdapter::the().mac_address());
auto target_addr = target.to_u32();
auto source_addr = source.to_u32();
@ -57,17 +69,17 @@ RoutingDecision route_to(const IPv4Address& target, const IPv4Address& source)
RefPtr<NetworkAdapter> local_adapter = nullptr;
RefPtr<NetworkAdapter> gateway_adapter = nullptr;
NetworkAdapter::for_each([source_addr, &target_addr, &local_adapter, &gateway_adapter](auto& adapter) {
NetworkAdapter::for_each([source_addr, &target_addr, &local_adapter, &gateway_adapter, &matches](auto& adapter) {
auto adapter_addr = adapter.ipv4_address().to_u32();
auto adapter_mask = adapter.ipv4_netmask().to_u32();
if (source_addr != 0 && source_addr != adapter_addr)
return;
if ((target_addr & adapter_mask) == (adapter_addr & adapter_mask))
if ((target_addr & adapter_mask) == (adapter_addr & adapter_mask) && matches(adapter))
local_adapter = adapter;
if (adapter.ipv4_gateway().to_u32() != 0)
if (adapter.ipv4_gateway().to_u32() != 0 && matches(adapter))
gateway_adapter = adapter;
});