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IPv4: Begin fleshing out TCP support.

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This commit is contained in:
Andreas Kling 2019-03-13 17:17:07 +01:00
parent ef5d0a397c
commit c588653f76
Notes: sideshowbarker 2024-07-19 15:04:02 +09:00
4 changed files with 112 additions and 6 deletions
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48
Kernel/NetworkTask.cpp
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@ -3,6 +3,7 @@
#include <Kernel/ARP.h>
#include <Kernel/ICMP.h>
#include <Kernel/UDP.h>
#include <Kernel/TCP.h>
#include <Kernel/IPv4.h>
#include <Kernel/IPv4Socket.h>
#include <Kernel/Process.h>
@ -10,14 +11,16 @@
#include <AK/Lock.h>
//#define ETHERNET_DEBUG
//#define IPV4_DEBUG
#define IPV4_DEBUG
//#define ICMP_DEBUG
#define UDP_DEBUG
#define TCP_DEBUG
static void handle_arp(const EthernetFrameHeader&, int frame_size);
static void handle_ipv4(const EthernetFrameHeader&, int frame_size);
static void handle_icmp(const EthernetFrameHeader&, int frame_size);
static void handle_udp(const EthernetFrameHeader&, int frame_size);
static void handle_tcp(const EthernetFrameHeader&, int frame_size);
Lockable<HashMap<IPv4Address, MACAddress>>& arp_table()
{
@ -152,6 +155,8 @@ void handle_ipv4(const EthernetFrameHeader& eth, int frame_size)
return handle_icmp(eth, frame_size);
case IPv4Protocol::UDP:
return handle_udp(eth, frame_size);
case IPv4Protocol::TCP:
return handle_tcp(eth, frame_size);
default:
kprintf("handle_ipv4: Unhandled protocol %u\n", packet.protocol());
break;
@ -244,3 +249,44 @@ void handle_udp(const EthernetFrameHeader& eth, int frame_size)
ASSERT(socket->source_port() == udp_packet.destination_port());
socket->did_receive(ByteBuffer::copy((const byte*)&ipv4_packet, sizeof(IPv4Packet) + ipv4_packet.payload_size()));
}
void handle_tcp(const EthernetFrameHeader& eth, int frame_size)
{
(void)frame_size;
auto& ipv4_packet = *static_cast<const IPv4Packet*>(eth.payload());
auto* adapter = NetworkAdapter::from_ipv4_address(ipv4_packet.destination());
if (!adapter) {
kprintf("handle_tcp: this packet is not for me, it's for %s\n", ipv4_packet.destination().to_string().characters());
return;
}
auto& tcp_packet = *static_cast<const TCPPacket*>(ipv4_packet.payload());
#ifdef TCP_DEBUG
kprintf("handle_tcp: source=%s:%u, destination=%s:%u seq=%u, ack=%u, flags=%w, window_size=%u\n",
ipv4_packet.source().to_string().characters(),
tcp_packet.source_port(),
ipv4_packet.destination().to_string().characters(),
tcp_packet.destination_port(),
tcp_packet.sequence_number(),
tcp_packet.ack_number(),
tcp_packet.flags(),
tcp_packet.window_size()
);
#endif
RetainPtr<IPv4Socket> socket;
{
LOCKER(IPv4Socket::sockets_by_tcp_port().lock());
auto it = IPv4Socket::sockets_by_tcp_port().resource().find(tcp_packet.destination_port());
if (it == IPv4Socket::sockets_by_tcp_port().resource().end())
return;
ASSERT((*it).value);
socket = *(*it).value;
}
LOCKER(socket->lock());
ASSERT(socket->type() == SOCK_STREAM);
ASSERT(socket->source_port() == tcp_packet.destination_port());
socket->did_receive(ByteBuffer::copy((const byte*)&ipv4_packet, sizeof(IPv4Packet) + ipv4_packet.payload_size()));
}