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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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24
Kernel/Net/Socket.cpp
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@ -25,6 +25,7 @@
*/
#include <AK/StringBuilder.h>
#include <AK/StringView.h>
#include <Kernel/FileSystem/FileDescription.h>
#include <Kernel/Net/IPv4Socket.h>
#include <Kernel/Net/LocalSocket.h>
@ -114,6 +115,16 @@ KResult Socket::setsockopt(int level, int option, const void* value, socklen_t v
return KResult(-EINVAL);
m_receive_timeout = *(const timeval*)value;
return KSuccess;
case SO_BINDTODEVICE: {
if (value_size != IFNAMSIZ)
return KResult(-EINVAL);
StringView ifname { (const char*)value };
auto device = NetworkAdapter::lookup_by_name(ifname);
if (!device)
return KResult(-ENODEV);
m_bound_interface = device;
return KSuccess;
}
default:
dbg() << "setsockopt(" << option << ") at SOL_SOCKET not implemented.";
return KResult(-ENOPROTOOPT);
@ -143,6 +154,19 @@ KResult Socket::getsockopt(FileDescription&, int level, int option, void* value,
*(int*)value = 0;
*value_size = sizeof(int);
return KSuccess;
case SO_BINDTODEVICE:
if (*value_size < IFNAMSIZ)
return KResult(-EINVAL);
if (m_bound_interface) {
const auto& name = m_bound_interface->name();
auto length = name.length() + 1;
memcpy(value, name.characters(), length);
*value_size = length;
return KSuccess;
} else {
*value_size = 0;
return KResult(-EFAULT);
}
default:
dbg() << "getsockopt(" << option << ") at SOL_SOCKET not implemented.";
return KResult(-ENOPROTOOPT);