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Kernel: Properly support the SO_BROADCAST socket option

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POSIX requires that broadcast sends will only be allowed if the
SO_BROADCAST socket option was set on the socket.
Also, broadcast sends to protocols that do not support broadcast (like
TCP), should always fail.
This commit is contained in:
Idan Horowitz 2023-12-24 19:01:09 +02:00 • committed by Andreas Kling
parent 8b2beb2ebe
commit 545f4b6cc1
7 changed files with 36 additions and 6 deletions
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14
Kernel/Net/Socket.cpp
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@ -130,6 +130,12 @@ ErrorOr<void> Socket::setsockopt(int level, int option, Userspace<void const*> u
case SO_REUSEADDR:
dbgln("FIXME: SO_REUSEADDR requested, but not implemented.");
return {};
case SO_BROADCAST: {
if (user_value_size != sizeof(int))
return EINVAL;
m_broadcast_allowed = TRY(copy_typed_from_user(static_ptr_cast<int const*>(user_value))) != 0;
return {};
}
default:
dbgln("setsockopt({}) at SOL_SOCKET not implemented.", option);
return ENOPROTOOPT;
@ -235,6 +241,14 @@ ErrorOr<void> Socket::getsockopt(OpenFileDescription&, int level, int option, Us
size = sizeof(routing_disabled);
return copy_to_user(value_size, &size);
}
case SO_BROADCAST: {
int broadcast_allowed = m_broadcast_allowed ? 1 : 0;
if (size < sizeof(broadcast_allowed))
return EINVAL;
TRY(copy_to_user(static_ptr_cast<int*>(value), &broadcast_allowed));
size = sizeof(broadcast_allowed);
return copy_to_user(value_size, &size);
}
default:
dbgln("getsockopt({}) at SOL_SOCKET not implemented.", option);
return ENOPROTOOPT;