451b60b8a2
utility to get rid of code duplication. New class vnet_server_c now contains all of the network emulation including the DNS code from bxhub.cc.
213 lines
6.4 KiB
C++
213 lines
6.4 KiB
C++
/////////////////////////////////////////////////////////////////////////
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// $Id$
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/////////////////////////////////////////////////////////////////////////
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//
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// Copyright (C) 2004-2020 The Bochs Project
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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//
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// netutil.h - shared code for eth_vnet.cc and bxhub.cc
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#ifndef BX_NETUTIL_H
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#define BX_NETUTIL_H
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#define ETHERNET_MAC_ADDR_LEN 6
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#if defined(_MSC_VER)
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#pragma pack(push, 1)
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#elif defined(__MWERKS__) && defined(macintosh)
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#pragma options align=packed
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#endif
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typedef struct ethernet_header {
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#if defined(_MSC_VER) && (_MSC_VER>=1300)
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__declspec(align(1))
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#endif
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Bit8u dst_mac_addr[ETHERNET_MAC_ADDR_LEN];
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Bit8u src_mac_addr[ETHERNET_MAC_ADDR_LEN];
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Bit16u type;
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}
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#if !defined(_MSC_VER)
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GCC_ATTRIBUTE((packed))
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#endif
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ethernet_header_t;
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typedef struct arp_header {
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#if defined(_MSC_VER) && (_MSC_VER>=1300)
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__declspec(align(1))
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#endif
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Bit16u hw_addr_space;
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Bit16u proto_addr_space;
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Bit8u hw_addr_len;
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Bit8u proto_addr_len;
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Bit16u opcode;
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/* HW address of sender */
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/* Protocol address of sender */
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/* HW address of target*/
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/* Protocol address of target */
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}
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#if !defined(_MSC_VER)
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GCC_ATTRIBUTE((packed))
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#endif
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arp_header_t;
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typedef struct ip_header {
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#if defined(_MSC_VER) && (_MSC_VER>=1300)
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__declspec(align(1))
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#endif
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#ifdef BX_LITTLE_ENDIAN
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Bit8u header_len : 4;
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Bit8u version : 4;
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#else
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Bit8u version : 4;
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Bit8u header_len : 4;
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#endif
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Bit8u tos;
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Bit16u total_len;
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Bit16u id;
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Bit16u frag_offs;
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Bit8u ttl;
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Bit8u protocol;
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Bit16u checksum;
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Bit32u src_addr;
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Bit32u dst_addr;
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}
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#if !defined(_MSC_VER)
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GCC_ATTRIBUTE((packed))
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#endif
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ip_header_t;
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typedef struct udp_header {
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#if defined(_MSC_VER) && (_MSC_VER>=1300)
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__declspec(align(1))
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#endif
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Bit16u src_port;
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Bit16u dst_port;
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Bit16u length;
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Bit16u checksum;
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}
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#if !defined(_MSC_VER)
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GCC_ATTRIBUTE((packed))
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#endif
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udp_header_t;
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#if defined(_MSC_VER)
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#pragma pack(pop)
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#elif defined(__MWERKS__) && defined(macintosh)
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#pragma options align=reset
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#endif
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// DHCP configuration structure
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typedef struct {
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Bit8u host_macaddr[6];
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Bit8u host_ipv4addr[4];
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Bit8u dns_ipv4addr[4];
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} dhcp_cfg_t;
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// vnet functions shared with bxhub
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#ifdef BXHUB
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#define bx_devmodel_c void
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#endif
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Bit16u ip_checksum(const Bit8u *buf, unsigned buf_len);
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// VNET server
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#define VNET_MAX_CLIENTS 6
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#define LAYER4_LISTEN_MAX 128
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typedef int (*layer4_handler_t)(
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void *this_ptr,
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const Bit8u *ipheader,
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unsigned ipheader_len,
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unsigned sourceport,
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unsigned targetport,
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const Bit8u *data,
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unsigned data_len,
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Bit8u *reply
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);
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class vnet_server_c {
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public:
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vnet_server_c();
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virtual ~vnet_server_c();
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void init(bx_devmodel_c *netdev, dhcp_cfg_t *dhcpc, const char *tftp_rootdir);
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void init_client(Bit8u clientid, const Bit8u *macaddr, const Bit8u *default_ipv4addr);
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int handle_packet(const Bit8u *buf, unsigned len, Bit8u *reply);
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layer4_handler_t get_layer4_handler(unsigned ipprotocol, unsigned port);
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bx_bool register_layer4_handler(unsigned ipprotocol, unsigned port,
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layer4_handler_t func);
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bx_bool unregister_layer4_handler(unsigned ipprotocol, unsigned port);
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private:
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bx_bool find_client(const Bit8u *mac_addr, Bit8u *clientid);
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int process_arp(Bit8u clientid, const Bit8u *buf, unsigned len, Bit8u *reply);
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int process_ipv4(Bit8u clientid, const Bit8u *buf, unsigned len, Bit8u *reply);
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int process_icmpipv4(Bit8u clientid, const Bit8u *ipheader, unsigned ipheader_len,
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const Bit8u *l4pkt, unsigned l4pkt_len, Bit8u *reply);
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int process_tcpipv4(Bit8u clientid, const Bit8u *ipheader, unsigned ipheader_len,
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const Bit8u *l4pkt, unsigned l4pkt_len, Bit8u *reply);
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int process_udpipv4(Bit8u clientid, const Bit8u *ipheader, unsigned ipheader_len,
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const Bit8u *l4pkt, unsigned l4pkt_len, Bit8u *reply);
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static int udpipv4_dhcp_handler(void *this_ptr, const Bit8u *ipheader,
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unsigned ipheader_len, unsigned sourceport,
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unsigned targetport, const Bit8u *data,
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unsigned data_len, Bit8u *reply);
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int udpipv4_dhcp_handler_ns(const Bit8u *ipheader, unsigned ipheader_len,
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unsigned sourceport, unsigned targetport,
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const Bit8u *data, unsigned data_len, Bit8u *reply);
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static int udpipv4_tftp_handler(void *this_ptr, const Bit8u *ipheader,
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unsigned ipheader_len, unsigned sourceport,
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unsigned targetport, const Bit8u *data,
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unsigned data_len, Bit8u *reply);
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int udpipv4_tftp_handler_ns(const Bit8u *ipheader, unsigned ipheader_len,
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unsigned sourceport, unsigned targetport,
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const Bit8u *data, unsigned data_len, Bit8u *reply);
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static int udpipv4_dns_handler(void *this_ptr, const Bit8u *ipheader,
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unsigned ipheader_len, unsigned sourceport,
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unsigned targetport, const Bit8u *data,
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unsigned data_len, Bit8u *reply);
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int udpipv4_dns_handler_ns(const Bit8u *ipheader, unsigned ipheader_len,
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unsigned sourceport, unsigned targetport,
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const Bit8u *data, unsigned data_len, Bit8u *reply);
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bx_devmodel_c *netdev;
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dhcp_cfg_t *dhcp;
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const char *tftp_root;
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struct {
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bx_bool init;
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const Bit8u *macaddr;
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const Bit8u *default_ipv4addr;
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Bit8u ipv4addr[4];
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char *hostname;
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} client[VNET_MAX_CLIENTS];
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struct {
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unsigned ipprotocol;
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unsigned port;
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layer4_handler_t func;
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} l4data[LAYER4_LISTEN_MAX];
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unsigned l4data_used;
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};
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#endif
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