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Kernel: Add SocketHandle helper class that wraps locked sockets.

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This allows us to have a comfy IPv4Socket::from_tcp_port() API that returns
a socket that's locked and safe to access. No need to worry about locking
at the client site.
This commit is contained in:
Andreas Kling 2019-03-14 09:19:24 +01:00
parent 3d5296a901
commit 54e7df0586
4 changed files with 106 additions and 22 deletions
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36
Kernel/IPv4Socket.cpp
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@ -27,6 +27,34 @@ Lockable<HashMap<word, IPv4Socket*>>& IPv4Socket::sockets_by_tcp_port()
return *s_map;
}
IPv4SocketHandle IPv4Socket::from_tcp_port(word port)
{
RetainPtr<IPv4Socket> socket;
{
LOCKER(sockets_by_tcp_port().lock());
auto it = sockets_by_tcp_port().resource().find(port);
if (it == sockets_by_tcp_port().resource().end())
return { };
socket = (*it).value;
ASSERT(socket);
}
return { move(socket) };
}
IPv4SocketHandle IPv4Socket::from_udp_port(word port)
{
RetainPtr<IPv4Socket> socket;
{
LOCKER(sockets_by_udp_port().lock());
auto it = sockets_by_udp_port().resource().find(port);
if (it == sockets_by_udp_port().resource().end())
return { };
socket = (*it).value;
ASSERT(socket);
}
return { move(socket) };
}
Lockable<HashTable<IPv4Socket*>>& IPv4Socket::all_sockets()
{
static Lockable<HashTable<IPv4Socket*>>* s_table;
@ -217,8 +245,12 @@ NetworkOrdered<word> IPv4Socket::compute_tcp_checksum(const IPv4Address& source,
if (checksum > 0xffff)
checksum = (checksum >> 16) + (checksum & 0xffff);
}
if (payload_size & 1)
ASSERT_NOT_REACHED();
if (payload_size & 1) {
word expanded_byte = ((const byte*)packet.payload())[payload_size - 1];
checksum += expanded_byte;
if (checksum > 0xffff)
checksum = (checksum >> 16) + (checksum & 0xffff);
}
return ~(checksum & 0xffff);
}