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sim_ether.c
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/* sim_ether.c: OS-dependent network routines
------------------------------------------------------------------------------
Copyright (c) 2002-2007, David T. Hittner
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Except as contained in this notice, the name of the author shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from the author.
------------------------------------------------------------------------------
This ethernet simulation is based on the PCAP and WinPcap packages.
PCAP/WinPcap was chosen as the basis for network code since it is the most
"universal" of the various network packages available. Using this style has
allowed rapid network development for the major SIMH platforms. Developing
a network package specifically for SIMH was rejected due to the time required;
the advantage would be a more easily compiled and integrated code set.
There are various problems associated with use of ethernet networking, which
would be true regardless of the network package used, since there are no
universally accepted networking methods. The most serious of these is getting
the proper networking package loaded onto the system, since most environments
do not come with the network interface packages loaded.
The second most serious network issue relates to security. The network
simulation needs to simulate operating system level functionality (packet
driving). However, the host network programming interfaces tend to operate at
the user level of functionality, so getting to the full functionality of
the network interface usually requires that the person executing the
network code be a privileged user of the host system. See the PCAP/WinPcap
documentation for the appropriate host platform if unprivileged use of
networking is needed - there may be known workarounds.
Define one of the two macros below to enable networking:
USE_NETWORK - Create statically linked network code
USE_SHARED - Create dynamically linked network code
------------------------------------------------------------------------------
Supported/Tested Platforms:
Windows(NT,2K,XP,2K3,Vista,Win7) WinPcap V3.0+
Linux libpcap at least 0.9
OpenBSD,FreeBSD,NetBSD libpcap at least 0.9
MAC OS/X libpcap at least 0.9
Solaris Sparc libpcap at least 0.9
Solaris Intel libpcap at least 0.9
AIX ??
HP/UX ??
Compaq Tru64 Unix ??
VMS Alpha/Itanium VMS only, needs VMS libpcap
WinPcap is available from:
http://winpcap.polito.it/
libpcap for VMS is available from:
http://simh.trailing-edge.com/sources/vms-pcap.zip
libpcap for other Unix platforms is available at:
NOTE: As of the release of this version of sim_ether.c ALL current
*nix platforms ship with a sufficiently new version of
libpcap, and ALL provide a libpcap-dev package for developing
libpcap based applications. The OS vendor supplied version
of libpcap AND the libpcap-dev components are preferred for
proper operation of both simh AND other applications on the
host system which use libpcap.
Current Version: http://www.tcpdump.org/daily/libpcap-current.tar.gz
Released Version: http://www.tcpdump.org/release/
When necessary (see NOTE above about vendor supplied libpcap),
we've gotten the tarball, unpacked, built and installed it with:
gzip -dc libpcap-current.tar.gz | tar xvf -
cd libpcap-directory-name
./configure
make
make install
Note: The "make install" step generally will have to be done as root.
This will install libpcap in /usr/local/lib and /usr/local/include
The current simh makefile will do the right thing to locate and
reference the OS provided libpcap or the one just installed.
Note: Building for the platforms indicated above, with the indicated libpcap,
should automatically leverage the appropriate mechanisms contained here.
Things are structured so that it is likely to work for any other as yet
untested platform. If it works for you, please let the author know so we
can update the table above. If it doesn't work, then the following #define
variables can influence the operation on an untested platform.
USE_BPF - Determines if this code leverages a libpcap/WinPcap
provided bpf packet filtering facility. All tested
environments have bpf facilities that work the way we
need them to. However a new one might not. undefine
this variable to let this code do its own filtering.
USE_SETNONBLOCK - Specifies whether the libpcap environment's non-blocking
semantics are to be leveraged. This helps to manage the
varying behaviours of the kernel packet facilities
leveraged by libpcap.
USE_READER_THREAD - Specifies that packet reading should be done in the
context of a separate thread. The Posix threading
APIs are used. This option is less efficient than the
default non-threaded approach, but it exists since some
platforms don't want to work with nonblocking libpcap
semantics. OpenBSD and NetBSD either don't have pthread
APIs available, or they are too buggy to be useful.
Using the threaded approach may require special compile
and/or link time switches (i.e. -lpthread or -pthread,
etc.) Consult the documentation for your platform as
needed. Although this may be 'less efficient' than the
non-threaded approach, the efficiency is an overall system
efficiency not necessarily a simulator efficiency. This
means that work is removed from the thread executing
simulated instructions so the simulated system will most
likely run faster (given that modern host CPUs are
multi-core and have someplace to do this work in parallel).
MUST_DO_SELECT - Specifies that, when USE_READER_THREAD is active,
select() should be used to determine when available
packets are ready for reading. Otherwise, we depend
on the libpcap/kernel packet timeout specified on
pcap_open_live. If USE_READER_THREAD is not set, then
MUST_DO_SELECT is irrelevant
USE_TAP_NETWORK - Specifies that support for tap networking should be
included. This can be leveraged, along with OS bridging
capabilities to share a single LAN interface. This
allows device names of the form tap:tap0 to be specified
at open time. This functionality is only useful/needed
on *nix platforms since native sharing of Windows NIC
devices works with no external magic.
USE_VDE_NETWORK - Specifies that support for vde networking should be
included. This can be leveraged, along with OS bridging
capabilities to share a single LAN interface. It also
can allow a simulator to have useful networking
functionality when running without root access. This
allows device names of the form vde:/tmp/switch to be
specified at open time. This functionality is only
available on *nix platforms since the vde api isn't
available on Windows.
NEED_PCAP_SENDPACKET
- Specifies that you are using an older version of libpcap
which doesn't provide a pcap_sendpacket API.
NOTE: Changing these defines is done in either sim_ether.h OR on the global
compiler command line which builds all of the modules included in a
simulator.
------------------------------------------------------------------------------
Modification history:
30-Mar-12 MP Added host NIC address determination on supported VMS platforms
01-Mar-12 MP Made host NIC address determination on *nix platforms more
robust.
01-Mar-12 MP Added host NIC address determination work when building
under Cygwin
01-Mar-12 AGN Add conditionals for Cygwin dynamic loading of wpcap.dll
01-Mar-12 AGN Specify the full /usr/lib for dlopen under Apple Mac OS X.
17-Nov-11 MP Added dynamic loading of libpcap on *nix platforms
30-Oct-11 MP Added support for vde (Virtual Distributed Ethernet) networking
29-Oct-11 MP Added support for integrated Tap networking interfaces on OSX
12-Aug-11 MP Cleaned up payload length determination
Fixed race condition detecting reflections when threaded
reading and writing is enabled
18-Apr-11 MP Fixed race condition with self loopback packets in
multithreaded environments
09-Jan-11 MP Fixed missing crc data when USE_READER_THREAD is defined and
crc's are needed (only the pdp11_xu)
16-Dec-10 MP added priority boost for read and write threads when
USE_READER_THREAD does I/O in separate threads. This helps
throughput since it allows these I/O bound threads to preempt
the main thread (which is executing simulated instructions).
09-Dec-10 MP allowed more flexible parsing of MAC address strings
09-Dec-10 MP Added support to determine if network address conflicts exist
07-Dec-10 MP Reworked DECnet self detection to the more general approach
of loopback self when a Physical Address is being set.
04-Dec-10 MP Changed eth_write to do nonblocking writes when
USE_READER_THREAD is defined.
20-Aug-10 TVO Fix for Mac OSX 10.6
17-Jun-10 MP Fixed bug in the AUTODIN II hash filtering.
14-Jun-10 MP Added support for integrated Tap networking interfaces on BSD
platforms.
13-Jun-10 MP Added support for integrated Tap networking interfaces on Linux
platforms.
31-May-10 MP Added support for more TOE (TCP Offload Engine) features for IPv4
network traffic from the host and/or from hosts on the LAN. These
new TOE features are: LSO (Large Send Offload) and Jumbo packet
fragmentation support. These features allow a simulated network
device to support traffic when a host leverages a NIC's Large
Send Offload capabilities to fregment and/or segment outgoing
network traffic. Additionally a simulated network device can
reasonably exist on a LAN which is configured to use Jumbo frames.
21-May-10 MP Added functionality to fixup IP header checksums to accomodate
packets from a host with a NIC which has TOE (TCP Offload Engine)
enabled which is expected to implement the checksum computations
in hardware. Since we catch packets before they arrive at the
NIC the expected checksum insertions haven't been performed yet.
This processing is only done for packets sent from the hoat to
the guest we're supporting. In general this will be a relatively
small number of packets so it is done for all IP frame packets
coming from the hoat to the guest. In order to make the
determination of packets specifically arriving from the host we
need to know the hardware MAC address of the host NIC. Currently
determining a NIC's MAC address is relatively easy on Windows.
The non-windows code works on linux and may work on other *nix
platforms either as is or with slight modifications. The code,
as implemented, only messes with this activity if the host
interface MAC address can be determined.
20-May-10 MP Added general support to deal with receiving packets smaller
than ETH_MIN_PACKET in length. These come from packets
looped back by some bridging mechanism and need to be padded
to the minimum frame size. A real NIC won't pass us any
packets like that. This fix belongs here since this layer
is responsible for interfacing to they physical layer
devices, AND it belongs here to get CRC processing right.
05-Mar-08 MP Added optional multicast filtering support for doing
LANCE style AUTODIN II based hashed filtering.
07-Feb-08 MP Added eth_show_dev to display ethernet state
Changed the return value from eth_read to return whether
or not a packet was read. No existing callers used or
checked constant return value that previously was being
supplied.
29-Jan-08 MP Added eth_set_async to provide a mechanism (when
USE_READER_THREAD is enabled) to allow packet reception
to dynamically update the simulator event queue and
potentially avoid polling for I/O. This provides a minimal
overhead (no polling) maximal responsiveness for network
activities.
29-Jan-08 MP Properly sequenced activities in eth_close to avoid a race
condition when USE_READER_THREAD is enabled.
25-Jan-08 MP Changed the following when USE_READER_THREAD is enabled:
- Fixed bug when the simulated device doesn't need crc
in packet data which is read.
- Added call to pcap_setmintocopy to minimize packet
delivery latencies.
- Added ethq_destroy and used it to avoid a memory leak in
eth_close.
- Properly cleaned up pthread mutexes in eth_close.
Migrated to using sim_os_ms_sleep for a delay instead of
a call to select().
Fixed the bpf filter used when no traffic is to be matched.
Reworked eth_add_packet_crc32 implementation to avoid an
extra buffer copy while reading packets.
Fixedup #ifdef's relating to USE_SHARED so that setting
USE_SHARED or USE_NETWORK will build a working network
environment.
23-Jan-08 MP Reworked eth_packet_trace and eth_packet_trace_ex to allow
only output ethernet header+crc and provide a mechanism for
the simulated device to display full packet data debugging.
17-May-07 DTH Fixed non-ethernet device removal loop (from Naoki Hamada)
15-May-07 DTH Added dynamic loading of wpcap.dll;
Corrected exceed max index bug in ethX lookup
04-May-07 DTH Corrected failure to look up ethernet device names in
the registry on Windows XP x64
10-Jul-06 RMS Fixed linux conditionalization (from Chaskiel Grundman)
02-Jun-06 JDB Fixed compiler warning for incompatible sscanf parameter
15-Dec-05 DTH Patched eth_host_devices [remove non-ethernet devices]
(from Mark Pizzolato and Galen Tackett, 08-Jun-05)
Patched eth_open [tun fix](from Antal Ritter, 06-Oct-05)
30-Nov-05 DTH Added option to regenerate CRC on received packets; some
ethernet devices need to pass it on to the simulation, and by
the time libpcap/winpcap gets the packet, the host OS network
layer has already stripped CRC out of the packet
01-Dec-04 DTH Added Windows user-defined adapter names (from Timothe Litt)
25-Mar-04 MP Revised comments and minor #defines to deal with updated
libpcap which now provides pcap_sendpacket on all platforms.
04-Feb-04 MP Returned success/fail status from eth_write to support
determining if the current libpcap connection can successfully
write packets.
Added threaded approach to reading packets since
this works better on some platforms (solaris intel) than the
inconsistently implemented non-blocking read approach.
04-Feb-04 DTH Converted ETH_DEBUG to sim_debug
13-Jan-04 MP tested and fixed on OpenBSD, NetBS and FreeBSD.
09-Jan-04 MP removed the BIOCSHDRCMPLT ioctl() for OS/X
05-Jan-04 DTH Added eth_mac_scan
30-Dec-03 DTH Cleaned up queue routines, added no network support message
26-Dec-03 DTH Added ethernet show and queue functions from pdp11_xq
15-Dec-03 MP polished generic libpcap support.
05-Dec-03 DTH Genericized eth_devices() and #ifdefs
03-Dec-03 MP Added Solaris support
02-Dec-03 DTH Corrected decnet fix to use reflection counting
01-Dec-03 DTH Added BPF source filtering and reflection counting
28-Nov-03 DTH Rewrote eth_devices using universal pcap_findalldevs()
25-Nov-03 DTH Verified DECNET_FIX, reversed ifdef to mainstream code
19-Nov-03 MP Fixed BPF functionality on Linux/BSD.
17-Nov-03 DTH Added xBSD simplification
14-Nov-03 DTH Added #ifdef DECNET_FIX for problematic duplicate detection code
13-Nov-03 DTH Merged in __FreeBSD__ support
21-Oct-03 MP Added enriched packet dumping for debugging
20-Oct-03 MP Added support for multiple ethernet devices on VMS
20-Sep-03 Ankan Add VMS support (Alpha only)
29-Sep-03 MP Changed separator character in eth_fmt_mac to be ":" to
format ethernet addresses the way the BPF compile engine
wants to see them.
Added BPF support to filter packets
Added missing printf in eth_close
07-Jun-03 MP Added WIN32 support for DECNET duplicate address detection.
06-Jun-03 MP Fixed formatting of Ethernet Protocol Type in eth_packet_trace
30-May-03 DTH Changed WIN32 to _WIN32 for consistency
07-Mar-03 MP Fixed Linux implementation of PacketGetAdapterNames to also
work on Red Hat 6.2-sparc and Debian 3.0r1-sparc.
03-Mar-03 MP Changed logging to be consistent on stdout and sim_log
01-Feb-03 MP Changed type of local variables in eth_packet_trace to
conform to the interface needs of eth_mac_fmt wich produces
char data instead of unsigned char data. Suggested by the
DECC compiler.
15-Jan-03 DTH Corrected PacketGetAdapterNames parameter2 datatype
26-Dec-02 DTH Merged Mark Pizzolato's enhancements with main source
Added networking documentation
Changed _DEBUG to ETH_DEBUG
20-Dec-02 MP Added display of packet CRC to the eth_packet_trace.
This helps distinguish packets with identical lengths
and protocols.
05-Dec-02 MP With the goal of draining the input buffer more rapidly
changed eth_read to call pcap_dispatch repeatedly until
either a timeout returns nothing or a packet allowed by
the filter is seen. This more closely reflects how the
pcap layer will work when the filtering is actually done
by a bpf filter.
31-Oct-02 DTH Added USE_NETWORK conditional
Reworked not attached test
Added OpenBSD support (from Federico Schwindt)
Added ethX detection simplification (from Megan Gentry)
Removed sections of temporary code
Added parameter validation
23-Oct-02 DTH Beta 5 released
22-Oct-02 DTH Added all_multicast and promiscuous support
Fixed not attached behavior
21-Oct-02 DTH Added NetBSD support (from Jason Thorpe)
Patched buffer size to make sure entire packet is read in
Made 'ethX' check characters passed as well as length
Corrected copyright again
16-Oct-02 DTH Beta 4 released
Corrected copyright
09-Oct-02 DTH Beta 3 released
Added pdp11 write acceleration (from Patrick Caulfield)
08-Oct-02 DTH Beta 2 released
Integrated with 2.10-0p4
Added variable vector and copyrights
04-Oct-02 DTH Added linux support (from Patrick Caulfield)
03-Oct-02 DTH Beta version of xq/sim_ether released for SIMH 2.09-11
24-Sep-02 DTH Finished eth_devices, eth_getname
18-Sep-02 DTH Callbacks implemented
13-Sep-02 DTH Basic packet read/write written
20-Aug-02 DTH Created Sim_Ether for O/S independant ethernet implementation
------------------------------------------------------------------------------
*/
#include <ctype.h>
#include "sim_ether.h"
#include "sim_sock.h"
/*============================================================================*/
/* OS-independant ethernet routines */
/*============================================================================*/
t_stat eth_mac_scan (ETH_MAC* mac, char* strmac)
{
unsigned int a0, a1, a2, a3, a4, a5;
const ETH_MAC zeros = {0,0,0,0,0,0};
const ETH_MAC ones = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
ETH_MAC newmac;
if ((6 != sscanf(strmac, "%x:%x:%x:%x:%x:%x", &a0, &a1, &a2, &a3, &a4, &a5)) &&
(6 != sscanf(strmac, "%x.%x.%x.%x.%x.%x", &a0, &a1, &a2, &a3, &a4, &a5)) &&
(6 != sscanf(strmac, "%x-%x-%x-%x-%x-%x", &a0, &a1, &a2, &a3, &a4, &a5)))
return SCPE_ARG;
if ((a0 > 0xFF) || (a1 > 0xFF) || (a2 > 0xFF) || (a3 > 0xFF) || (a4 > 0xFF) || (a5 > 0xFF))
return SCPE_ARG;
newmac[0] = a0;
newmac[1] = a1;
newmac[2] = a2;
newmac[3] = a3;
newmac[4] = a4;
newmac[5] = a5;
/* final check - mac cannot be broadcast or multicast address */
if (!memcmp(newmac, zeros, sizeof(ETH_MAC)) || /* broadcast */
!memcmp(newmac, ones, sizeof(ETH_MAC)) || /* broadcast */
(newmac[0] & 0x01) /* multicast */
)
return SCPE_ARG;
/* new mac is OK, copy into passed mac */
memcpy (*mac, newmac, sizeof(ETH_MAC));
return SCPE_OK;
}
void eth_mac_fmt(ETH_MAC* mac, char* buff)
{
uint8* m = (uint8*) mac;
sprintf(buff, "%02X:%02X:%02X:%02X:%02X:%02X", m[0], m[1], m[2], m[3], m[4], m[5]);
return;
}
static const uint32 crcTable[256] = {
0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F,
0xE963A535, 0x9E6495A3, 0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988,
0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91, 0x1DB71064, 0x6AB020F2,
0xF3B97148, 0x84BE41DE, 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7,
0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9,
0xFA0F3D63, 0x8D080DF5, 0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172,
0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B, 0x35B5A8FA, 0x42B2986C,
0xDBBBC9D6, 0xACBCF940, 0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59,
0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423,
0xCFBA9599, 0xB8BDA50F, 0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924,
0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D, 0x76DC4190, 0x01DB7106,
0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D,
0x91646C97, 0xE6635C01, 0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E,
0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457, 0x65B0D9C6, 0x12B7E950,
0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65,
0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, 0x4ADFA541, 0x3DD895D7,
0xA4D1C46D, 0xD3D6F4FB, 0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0,
0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9, 0x5005713C, 0x270241AA,
0xBE0B1010, 0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,
0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81,
0xB7BD5C3B, 0xC0BA6CAD, 0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A,
0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683, 0xE3630B12, 0x94643B84,
0x0D6D6A3E, 0x7A6A5AA8, 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1,
0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB,
0x196C3671, 0x6E6B06E7, 0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC,
0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5, 0xD6D6A3E8, 0xA1D1937E,
0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B,
0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55,
0x316E8EEF, 0x4669BE79, 0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236,
0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F, 0xC5BA3BBE, 0xB2BD0B28,
0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D,
0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 0x9C0906A9, 0xEB0E363F,
0x72076785, 0x05005713, 0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38,
0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21, 0x86D3D2D4, 0xF1D4E242,
0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69,
0x616BFFD3, 0x166CCF45, 0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2,
0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB, 0xAED16A4A, 0xD9D65ADC,
0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605, 0xCDD70693,
0x54DE5729, 0x23D967BF, 0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94,
0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D
};
uint32 eth_crc32(uint32 crc, const void* vbuf, size_t len)
{
const uint32 mask = 0xFFFFFFFF;
const unsigned char* buf = (const unsigned char*)vbuf;
crc ^= mask;
while (len > 8) {
crc = (crc >> 8) ^ crcTable[ (crc ^ (*buf++)) & 0xFF ];
crc = (crc >> 8) ^ crcTable[ (crc ^ (*buf++)) & 0xFF ];
crc = (crc >> 8) ^ crcTable[ (crc ^ (*buf++)) & 0xFF ];
crc = (crc >> 8) ^ crcTable[ (crc ^ (*buf++)) & 0xFF ];
crc = (crc >> 8) ^ crcTable[ (crc ^ (*buf++)) & 0xFF ];
crc = (crc >> 8) ^ crcTable[ (crc ^ (*buf++)) & 0xFF ];
crc = (crc >> 8) ^ crcTable[ (crc ^ (*buf++)) & 0xFF ];
crc = (crc >> 8) ^ crcTable[ (crc ^ (*buf++)) & 0xFF ];
len -= 8;
}
while (0 != len--)
crc = (crc >> 8) ^ crcTable[ (crc ^ (*buf++)) & 0xFF ];
return(crc ^ mask);
}
int eth_get_packet_crc32_data(const uint8 *msg, int len, uint8 *crcdata)
{
int crc_len;
if (len <= ETH_MAX_PACKET) {
uint32 crc = eth_crc32(0, msg, len); /* calculate CRC */
uint32 ncrc = htonl(crc); /* CRC in network order */
int size = sizeof(ncrc); /* size of crc field */
memcpy(crcdata, &ncrc, size); /* append crc to packet */
crc_len = len + size; /* set packet crc length */
} else {
crc_len = 0; /* appending crc would destroy packet */
}
return crc_len;
}
int eth_add_packet_crc32(uint8 *msg, int len)
{
int crc_len;
if (len <= ETH_MAX_PACKET) {
crc_len = eth_get_packet_crc32_data(msg, len, &msg[len]);/* append crc to packet */
} else {
crc_len = 0; /* appending crc would destroy packet */
}
return crc_len;
}
void eth_setcrc(ETH_DEV* dev, int need_crc)
{
dev->need_crc = need_crc;
}
void eth_packet_trace_ex(ETH_DEV* dev, const uint8 *msg, int len, char* txt, int detail, uint32 reason)
{
if (dev->dptr->dctrl & reason) {
char src[20];
char dst[20];
unsigned short* proto = (unsigned short*) &msg[12];
uint32 crc = eth_crc32(0, msg, len);
eth_mac_fmt((ETH_MAC*)&msg[0], dst);
eth_mac_fmt((ETH_MAC*)&msg[6], src);
sim_debug(reason, dev->dptr, "%s dst: %s src: %s proto: 0x%04X len: %d crc: %X\n",
txt, dst, src, ntohs(*proto), len, crc);
if (detail) {
int i, same, group, sidx, oidx;
char outbuf[80], strbuf[18];
static char hex[] = "0123456789ABCDEF";
for (i=same=0; i<len; i += 16) {
if ((i > 0) && (0 == memcmp(&msg[i], &msg[i-16], 16))) {
++same;
continue;
}
if (same > 0) {
sim_debug(reason, dev->dptr, "%04X thru %04X same as above\n", i-(16*same), i-1);
same = 0;
}
group = (((len - i) > 16) ? 16 : (len - i));
for (sidx=oidx=0; sidx<group; ++sidx) {
outbuf[oidx++] = ' ';
outbuf[oidx++] = hex[(msg[i+sidx]>>4)&0xf];
outbuf[oidx++] = hex[msg[i+sidx]&0xf];
if (isprint(msg[i+sidx]))
strbuf[sidx] = msg[i+sidx];
else
strbuf[sidx] = '.';
}
outbuf[oidx] = '\0';
strbuf[sidx] = '\0';
sim_debug(reason, dev->dptr, "%04X%-48s %s\n", i, outbuf, strbuf);
}
if (same > 0) {
sim_debug(reason, dev->dptr, "%04X thru %04X same as above\n", i-(16*same), len-1);
}
}
}
}
void eth_packet_trace(ETH_DEV* dev, const uint8 *msg, int len, char* txt)
{
eth_packet_trace_ex(dev, msg, len, txt, 0, dev->dbit);
}
char* eth_getname(int number, char* name)
{
ETH_LIST list[ETH_MAX_DEVICE];
int count = eth_devices(ETH_MAX_DEVICE, list);
if ((number < 0) || (count <= number))
return NULL;
strcpy(name, list[number].name);
return name;
}
char* eth_getname_bydesc(char* desc, char* name)
{
ETH_LIST list[ETH_MAX_DEVICE];
int count = eth_devices(ETH_MAX_DEVICE, list);
int i;
size_t j=strlen(desc);
for (i=0; i<count; i++) {
int found = 1;
size_t k = strlen(list[i].desc);
if (j != k) continue;
for (k=0; k<j; k++)
if (tolower(list[i].desc[k]) != tolower(desc[k]))
found = 0;
if (found == 0) continue;
/* found a case-insensitive description match */
strcpy(name, list[i].name);
return name;
}
/* not found */
return NULL;
}
/* strncasecmp() is not available on all platforms */
int eth_strncasecmp(char* string1, char* string2, size_t len)
{
size_t i;
unsigned char s1, s2;
for (i=0; i<len; i++) {
s1 = string1[i];
s2 = string2[i];
if (islower (s1)) s1 = toupper (s1);
if (islower (s2)) s2 = toupper (s2);
if (s1 < s2)
return -1;
if (s1 > s2)
return 1;
if (s1 == 0) return 0;
}
return 0;
}
char* eth_getname_byname(char* name, char* temp)
{
ETH_LIST list[ETH_MAX_DEVICE];
int count = eth_devices(ETH_MAX_DEVICE, list);
size_t n;
int i, found;
found = 0;
n = strlen(name);
for (i=0; i<count && !found; i++) {
if ((n == strlen(list[i].name)) &&
(eth_strncasecmp(name, list[i].name, n) == 0)) {
found = 1;
strcpy(temp, list[i].name); /* only case might be different */
}
}
return (found ? temp : NULL);
}
char* eth_getdesc_byname(char* name, char* temp)
{
ETH_LIST list[ETH_MAX_DEVICE];
int count = eth_devices(ETH_MAX_DEVICE, list);
size_t n;
int i, found;
found = 0;
n = strlen(name);
for (i=0; i<count && !found; i++) {
if ((n == strlen(list[i].name)) &&
(eth_strncasecmp(name, list[i].name, n) == 0)) {
found = 1;
strcpy(temp, list[i].desc);
}
}
return (found ? temp : NULL);
}
void eth_zero(ETH_DEV* dev)
{
/* set all members to NULL OR 0 */
memset(dev, 0, sizeof(ETH_DEV));
dev->reflections = -1; /* not established yet */
}
static ETH_DEV **eth_open_devices = NULL;
static int eth_open_device_count = 0;
#if defined (USE_NETWORK) || defined (USE_SHARED)
static void _eth_add_to_open_list (ETH_DEV* dev)
{
eth_open_devices = (ETH_DEV**)realloc(eth_open_devices, (eth_open_device_count+1)*sizeof(*eth_open_devices));
eth_open_devices[eth_open_device_count++] = dev;
}
static void _eth_remove_from_open_list (ETH_DEV* dev)
{
int i, j;
for (i=0; i<eth_open_device_count; ++i)
if (eth_open_devices[i] == dev) {
for (j=i+1; j<eth_open_device_count; ++j)
eth_open_devices[j-1] = eth_open_devices[j];
--eth_open_device_count;
break;
}
}
#endif
t_stat eth_show (FILE* st, UNIT* uptr, int32 val, void* desc)
{
ETH_LIST list[ETH_MAX_DEVICE];
int number = eth_devices(ETH_MAX_DEVICE, list);
fprintf(st, "ETH devices:\n");
if (number == -1)
fprintf(st, " network support not available in simulator\n");
else
if (number == 0)
fprintf(st, " no network devices are available\n");
else {
size_t min, len;
int i;
for (i=0, min=0; i<number; i++)
if ((len = strlen(list[i].name)) > min) min = len;
for (i=0; i<number; i++)
fprintf(st," eth%d\t%-*s (%s)\n", i, (int)min, list[i].name, list[i].desc);
}
if (eth_open_device_count) {
int i;
char desc[ETH_DEV_DESC_MAX], *d;
fprintf(st,"Open ETH Devices:\n");
for (i=0; i<eth_open_device_count; i++) {
d = eth_getdesc_byname(eth_open_devices[i]->name, desc);
if (d)
fprintf(st, " %-7s%s (%s)\n", eth_open_devices[i]->dptr->name, eth_open_devices[i]->dptr->units[0].filename, d);
else
fprintf(st, " %-7s%s\n", eth_open_devices[i]->dptr->name, eth_open_devices[i]->dptr->units[0].filename);
eth_show_dev (st, eth_open_devices[i]);
}
}
return SCPE_OK;
}
t_stat eth_show_devices (FILE* st, DEVICE *dptr, UNIT* uptr, int32 val, char* desc)
{
return eth_show (st, uptr, val, desc);
}
t_stat ethq_init(ETH_QUE* que, int max)
{
/* create dynamic queue if it does not exist */
if (!que->item) {
que->item = (struct eth_item *) calloc(max, sizeof(struct eth_item));
if (!que->item) {
/* failed to allocate memory */
char* msg = "EthQ: failed to allocate dynamic queue[%d]\r\n";
printf(msg, max);
if (sim_log) fprintf(sim_log, msg, max);
return SCPE_MEM;
};
que->max = max;
};
ethq_clear(que);
return SCPE_OK;
}
t_stat ethq_destroy(ETH_QUE* que)
{
/* release dynamic queue if it exists */
ethq_clear(que);
que->max = 0;
if (que->item) {
free(que->item);
que->item = NULL;
};
return SCPE_OK;
}
void ethq_clear(ETH_QUE* que)
{
int i;
/* free up any extended packets */
for (i=0; i<que->max; ++i)
if (que->item[i].packet.oversize) {
free (que->item[i].packet.oversize);
que->item[i].packet.oversize = NULL;
}
/* clear packet array */
memset(que->item, 0, sizeof(struct eth_item) * que->max);
/* clear rest of structure */
que->count = que->head = que->tail = 0;
}
void ethq_remove(ETH_QUE* que)
{
struct eth_item* item = &que->item[que->head];
if (que->count) {
if (item->packet.oversize)
free (item->packet.oversize);
memset(item, 0, sizeof(struct eth_item));
if (++que->head == que->max)
que->head = 0;
que->count--;
}
}
void ethq_insert_data(ETH_QUE* que, int32 type, const uint8 *data, int used, size_t len, size_t crc_len, const uint8 *crc_data, int32 status)
{
struct eth_item* item;
/* if queue empty, set pointers to beginning */
if (!que->count) {
que->head = 0;
que->tail = -1;
}
/* find new tail of the circular queue */
if (++que->tail == que->max)
que->tail = 0;
if (++que->count > que->max) {
que->count = que->max;
/* lose oldest packet */
if (++que->head == que->max)
que->head = 0;
que->loss++;
}
if (que->count > que->high)
que->high = que->count;
/* set information in (new) tail item */
item = &que->item[que->tail];
item->type = type;
item->packet.len = len;
item->packet.used = used;
item->packet.crc_len = crc_len;
if (len <= sizeof (item->packet.msg)) {
memcpy(item->packet.msg, data, ((len > crc_len) ? len : crc_len));
if (crc_data && (crc_len > len))
memcpy(&item->packet.msg[len], crc_data, ETH_CRC_SIZE);
}
else {
item->packet.oversize = (uint8 *)realloc (item->packet.oversize, ((len > crc_len) ? len : crc_len));
memcpy(item->packet.oversize, data, ((len > crc_len) ? len : crc_len));
if (crc_data && (crc_len > len))
memcpy(&item->packet.oversize[len], crc_data, ETH_CRC_SIZE);
}
item->packet.status = status;
}
void ethq_insert(ETH_QUE* que, int32 type, ETH_PACK* pack, int32 status)
{
ethq_insert_data(que, type, pack->oversize ? pack->oversize : pack->msg, pack->used, pack->len, pack->crc_len, NULL, status);
}
/*============================================================================*/
/* Non-implemented versions */
/*============================================================================*/
#if !defined (USE_NETWORK) && !defined (USE_SHARED)
t_stat eth_open(ETH_DEV* dev, char* name, DEVICE* dptr, uint32 dbit)
{return SCPE_NOFNC;}
t_stat eth_close (ETH_DEV* dev)
{return SCPE_NOFNC;}
t_stat eth_attach_help(FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, char *cptr)
{
fprintf (st, "%s attach help\n\n", dptr->name);
fprintf (st, "This simulator was not built with ethernet device support\n");
return SCPE_OK;
}
t_stat eth_check_address_conflict (ETH_DEV* dev,
ETH_MAC* const mac)
{return SCPE_NOFNC;}
t_stat eth_set_async (ETH_DEV *dev, int latency)
{return SCPE_NOFNC;}
t_stat eth_clr_async (ETH_DEV *dev)
{return SCPE_NOFNC;}
t_stat eth_write (ETH_DEV* dev, ETH_PACK* packet, ETH_PCALLBACK routine)
{return SCPE_NOFNC;}
int eth_read (ETH_DEV* dev, ETH_PACK* packet, ETH_PCALLBACK routine)
{return SCPE_NOFNC;}
t_stat eth_filter (ETH_DEV* dev, int addr_count, ETH_MAC* const addresses,
ETH_BOOL all_multicast, ETH_BOOL promiscuous)
{return SCPE_NOFNC;}
t_stat eth_filter_hash (ETH_DEV* dev, int addr_count, ETH_MAC* const addresses,
ETH_BOOL all_multicast, ETH_BOOL promiscuous, ETH_MULTIHASH* const hash)
{return SCPE_NOFNC;}
int eth_devices (int max, ETH_LIST* dev)
{return -1;}
void eth_show_dev (FILE* st, ETH_DEV* dev)
{}
#else /* endif unimplemented */
/*============================================================================*/
/* WIN32, Linux, and xBSD routines use WinPcap and libpcap packages */
/* OpenVMS Alpha uses a WinPcap port and an associated execlet */
/*============================================================================*/
#if defined (xBSD) || defined(__APPLE__)
#include <sys/ioctl.h>
#include <net/bpf.h>
#endif /* xBSD */
#include <pcap.h>
#include <string.h>
#ifdef USE_TAP_NETWORK
#if defined(__linux) || defined(__linux__)
#include <sys/ioctl.h>
#include <net/if.h>
#include <linux/if_tun.h>
#elif defined(USE_BSDTUNTAP)
#include <sys/types.h>
#include <net/if_types.h>
#include <net/if.h>
#else /* We don't know how to do this on the current platform */
#undef USE_TAP_NETWORK
#endif
#endif /* USE_TAP_NETWORK */
#ifdef USE_VDE_NETWORK
#include <libvdeplug.h>
#endif /* USE_VDE_NETWORK */
/* Allows windows to look up user-defined adapter names */
#if defined(_WIN32)
#include <winreg.h>
#endif
#ifdef HAVE_DLOPEN
#include <dlfcn.h>
#endif
#if defined(USE_SHARED) && (defined(_WIN32) || defined(HAVE_DLOPEN))
/* Dynamic DLL loading technique and modified source comes from
Etherial/WireShark capture_pcap.c */
/* Dynamic DLL load variables */
#ifdef _WIN32
static HINSTANCE hLib = 0; /* handle to DLL */
#else
static void *hLib = 0; /* handle to Library */
#endif
static int lib_loaded = 0; /* 0=not loaded, 1=loaded, 2=library load failed, 3=Func load failed */
static char* lib_name =
#if defined(_WIN32) || defined(__CYGWIN__)
"wpcap.dll";
#elif defined(__APPLE__)
"/usr/lib/libpcap.A.dylib";
#else
#define __STR_QUOTE(tok) #tok
#define __STR(tok) __STR_QUOTE(tok)
"libpcap." __STR(HAVE_DLOPEN);
#endif
static char* no_pcap =
#if defined(_WIN32) || defined(__CYGWIN__)
"wpcap load failure";
#else
"libpcap load failure";
#endif
/* define pointers to pcap functions needed */
static void (*p_pcap_close) (pcap_t *);
static int (*p_pcap_compile) (pcap_t *, struct bpf_program *, const char *, int, bpf_u_int32);
static int (*p_pcap_datalink) (pcap_t *);
static int (*p_pcap_dispatch) (pcap_t *, int, pcap_handler, u_char *);
static int (*p_pcap_findalldevs) (pcap_if_t **, char *);
static void (*p_pcap_freealldevs) (pcap_if_t *);
static void (*p_pcap_freecode) (struct bpf_program *);
static char* (*p_pcap_geterr) (pcap_t *);
static int (*p_pcap_lookupnet) (const char *, bpf_u_int32 *, bpf_u_int32 *, char *);
static pcap_t* (*p_pcap_open_live) (const char *, int, int, int, char *);
#ifdef _WIN32
static int (*p_pcap_setmintocopy) (pcap_t* handle, int);
static HANDLE (*p_pcap_getevent) (pcap_t *);
#else
#ifdef MUST_DO_SELECT
static int (*p_pcap_get_selectable_fd) (pcap_t *);
#endif
static int (*p_pcap_fileno) (pcap_t *);
#endif
static int (*p_pcap_sendpacket) (pcap_t* handle, const u_char* msg, int len);
static int (*p_pcap_setfilter) (pcap_t *, struct bpf_program *);
static int (*p_pcap_setnonblock)(pcap_t* a, int nonblock, char *errbuf);
static char* (*p_pcap_lib_version) (void);
/* load function pointer from DLL */
typedef int (*_func)();
static void load_function(char* function, _func* func_ptr) {
#ifdef _WIN32
*func_ptr = (_func)((size_t)GetProcAddress(hLib, function));
#else
*func_ptr = (_func)((size_t)dlsym(hLib, function));
#endif
if (*func_ptr == 0) {
char* msg = "Eth: Failed to find function '%s' in %s\r\n";
printf (msg, function, lib_name);
if (sim_log) fprintf (sim_log, msg, function, lib_name);
lib_loaded = 3;
}
}
/* load wpcap.dll as required */
int load_pcap(void) {
switch(lib_loaded) {
case 0: /* not loaded */
/* attempt to load DLL */
#ifdef _WIN32
hLib = LoadLibraryA(lib_name);
#else
hLib = dlopen(lib_name, RTLD_NOW);
#endif
if (hLib == 0) {
/* failed to load DLL */