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c8d9f1b9c9
Since the CPU already does almost all necessary validation steps for us, we don't really need to attempt to do this. Doing it ourselves doesn't really work very reliably, because we'd have to account for other processors modifying virtual memory, and we'd have to account for e.g. pages not being able to be allocated due to insufficient resources. So change the copy_to/from_user (and associated helper functions) to use the new safe_memcpy, which will return whether it succeeded or not. The only manual validation step needed (which the CPU can't perform for us) is making sure the pointers provided by user mode aren't pointing to kernel mappings. To make it easier to read/write from/to either kernel or user mode data add the UserOrKernelBuffer helper class, which will internally either use copy_from/to_user or directly memcpy, or pass the data through directly using a temporary buffer on the stack. Last but not least we need to keep syscall params trivial as we need to copy them from/to user mode using copy_from/to_user.
107 lines
4 KiB
C++
107 lines
4 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/ByteBuffer.h>
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#include <AK/Function.h>
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#include <AK/MACAddress.h>
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#include <AK/SinglyLinkedList.h>
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#include <AK/Types.h>
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#include <AK/WeakPtr.h>
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#include <AK/Weakable.h>
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#include <Kernel/KBuffer.h>
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#include <Kernel/Net/ARP.h>
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#include <Kernel/Net/ICMP.h>
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#include <Kernel/Net/IPv4.h>
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#include <Kernel/UserOrKernelBuffer.h>
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namespace Kernel {
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class NetworkAdapter;
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class NetworkAdapter : public RefCounted<NetworkAdapter> {
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public:
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static void for_each(Function<void(NetworkAdapter&)>);
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static RefPtr<NetworkAdapter> from_ipv4_address(const IPv4Address&);
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static RefPtr<NetworkAdapter> lookup_by_name(const StringView&);
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virtual ~NetworkAdapter();
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virtual const char* class_name() const = 0;
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const String& name() const { return m_name; }
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MACAddress mac_address() { return m_mac_address; }
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IPv4Address ipv4_address() const { return m_ipv4_address; }
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IPv4Address ipv4_netmask() const { return m_ipv4_netmask; }
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IPv4Address ipv4_gateway() const { return m_ipv4_gateway; }
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virtual bool link_up() { return false; }
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void set_ipv4_address(const IPv4Address&);
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void set_ipv4_netmask(const IPv4Address&);
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void set_ipv4_gateway(const IPv4Address&);
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void send(const MACAddress&, const ARPPacket&);
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int send_ipv4(const MACAddress&, const IPv4Address&, IPv4Protocol, const UserOrKernelBuffer& payload, size_t payload_size, u8 ttl);
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int send_ipv4_fragmented(const MACAddress&, const IPv4Address&, IPv4Protocol, const UserOrKernelBuffer& payload, size_t payload_size, u8 ttl);
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size_t dequeue_packet(u8* buffer, size_t buffer_size);
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bool has_queued_packets() const { return !m_packet_queue.is_empty(); }
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u32 mtu() const { return m_mtu; }
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void set_mtu(u32 mtu) { m_mtu = mtu; }
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u32 packets_in() const { return m_packets_in; }
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u32 bytes_in() const { return m_bytes_in; }
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u32 packets_out() const { return m_packets_out; }
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u32 bytes_out() const { return m_bytes_out; }
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Function<void()> on_receive;
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protected:
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NetworkAdapter();
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void set_interface_name(const StringView& basename);
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void set_mac_address(const MACAddress& mac_address) { m_mac_address = mac_address; }
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virtual void send_raw(ReadonlyBytes) = 0;
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void did_receive(ReadonlyBytes);
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private:
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MACAddress m_mac_address;
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IPv4Address m_ipv4_address;
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IPv4Address m_ipv4_netmask;
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IPv4Address m_ipv4_gateway;
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SinglyLinkedList<KBuffer> m_packet_queue;
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SinglyLinkedList<KBuffer> m_unused_packet_buffers;
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size_t m_unused_packet_buffers_count { 0 };
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String m_name;
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u32 m_packets_in { 0 };
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u32 m_bytes_in { 0 };
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u32 m_packets_out { 0 };
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u32 m_bytes_out { 0 };
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u32 m_mtu { 1500 };
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};
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}
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