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Added TCP stub to vnet server - returning "Connection refused" for now.

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This commit is contained in:
Volker Ruppert 2020-05-03 11:38:16 +00:00
parent 9b844fc341
commit 780517aeca
1 changed files with 49 additions and 4 deletions
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53
bochs/iodev/network/netutil.cc
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@ -473,11 +473,56 @@ int vnet_server_c::process_tcpipv4(Bit8u clientid, const Bit8u *ipheader,
unsigned ipheader_len, const Bit8u *l4pkt,
unsigned l4pkt_len, Bit8u *reply)
{
if (l4pkt_len < 20) return 0;
unsigned tcp_src_port, tcp_dst_port, tcphdr_len, tcpdata_len = 0;
Bit32u guest_seq_num;
static Bit32u host_seq_num = 0;
BX_ERROR(("tcp packet - not implemented"));
// TODO
return 0;
if (l4pkt_len < 20) return 0;
tcp_header_t *tcphdr = (tcp_header_t *)l4pkt;
tcp_header_t *tcprhdr = (tcp_header_t *)&reply[34];
tcp_src_port = ntohs(tcphdr->src_port);
tcp_dst_port = ntohs(tcphdr->dst_port);
guest_seq_num = ntohl(tcphdr->seq_num);
if (tcphdr->flags.syn) {
memset(tcprhdr, 0, sizeof(tcp_header_t));
tcprhdr->flags.syn = 0;
tcprhdr->flags.rst = 1;
tcprhdr->flags.ack = 1;
tcprhdr->seq_num = htonl(host_seq_num);
tcprhdr->ack_num = htonl(guest_seq_num+1);
tcprhdr->window = 0;
tcphdr_len = 20;
tcpdata_len = 0;
}
BX_ERROR(("tcp packet - not implemented (port = %d)", tcp_dst_port));
// host-to-guest
if ((tcpdata_len + 54U) > BX_PACKET_BUFSIZE) {
BX_ERROR(("generated tcp data is too long"));
return 0;
}
// tcp pseudo-header
reply[34U-12U]=0;
reply[34U-11U]=0x06; // TCP
put_net2(&reply[34U-10U],tcphdr_len+tcpdata_len);
memcpy(&reply[34U-8U], dhcp->host_ipv4addr, 4);
memcpy(&reply[34U-4U], client[clientid].ipv4addr, 4);
// tcp header
tcprhdr->src_port = htons(tcp_dst_port);
tcprhdr->dst_port = htons(tcp_src_port);
tcprhdr->data_offset = tcphdr_len >> 2;
tcprhdr->checksum = 0;
put_net2(&reply[34U+16U], ip_checksum(&reply[34U-12U],12U+tcphdr_len+tcpdata_len) ^ (Bit16u)0xffff);
// ip header
memset(&reply[14U],0,20U);
reply[14U+0] = 0x45;
reply[14U+1] = 0x00;
put_net2(&reply[14U+2],20U+tcphdr_len+tcpdata_len);
put_net2(&reply[14U+4],1);
reply[14U+6] = 0x00;
reply[14U+7] = 0x00;
reply[14U+8] = 0x07; // TTL
reply[14U+9] = 0x06; // TCP
return (tcpdata_len+tcphdr_len+34);
}
layer4_handler_t vnet_server_c::get_layer4_handler(