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NetBSD/dist/dhcp/common/dlpi.c
drochner 9fbefaf7c9 merge dhcp-3.0.3
2005-08-11 17:13:21 +00:00

1337 lines
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/* dlpi.c
Data Link Provider Interface (DLPI) network interface code. */
/*
* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
* Copyright (c) 1996-2003 by Internet Software Consortium
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Internet Systems Consortium, Inc.
* 950 Charter Street
* Redwood City, CA 94063
* <info@isc.org>
* http://www.isc.org/
*
* This software was written for Internet Systems Consortium
* by Eric James Negaard, <lmdejn@lmd.ericsson.se>. To learn more about
* Internet Systems Consortium, see ``http://www.isc.org''.
*
* Joost Mulders has also done considerable work in debugging the DLPI API
* support on Solaris and getting this code to work properly on a variety
* of different Solaris platforms.
*/
/*
* Based largely in part to the existing NIT code in nit.c.
*
* This code has been developed and tested on sparc-based machines running
* SunOS 5.5.1, with le and hme network interfaces. It should be pretty
* generic, though.
*/
/*
* Implementation notes:
*
* I first tried to write this code to the "vanilla" DLPI 2.0 API.
* It worked on a Sun Ultra-1 with a hme interface, but didn't work
* on Sun SparcStation 5's with "le" interfaces (the packets sent out
* via dlpiunitdatareq contained an Ethernet type of 0x0000 instead
* of the expected 0x0800).
*
* Therefore I added the "DLPI_RAW" code which is a Sun extension to
* the DLPI standard. This code works on both of the above machines.
* This is configurable in the OS-dependent include file by defining
* USE_DLPI_RAW.
*
* It quickly became apparant that I should also use the "pfmod"
* STREAMS module to cut down on the amount of user level packet
* processing. I don't know how widely available "pfmod" is, so it's
* use is conditionally included. This is configurable in the
* OS-dependent include file by defining USE_DLPI_PFMOD.
*
* A major quirk on the Sun's at least, is that no packets seem to get
* sent out the interface until six seconds after the interface is
* first "attached" to [per system reboot] (it's actually from when
* the interface is attached, not when it is plumbed, so putting a
* sleep into the dhclient-script at PREINIT time doesn't help). I
* HAVE tried, without success to poll the fd to see when it is ready
* for writing. This doesn't help at all. If the sleeps are not done,
* the initial DHCPREQUEST or DHCPDISCOVER never gets sent out, so
* I've put them here, when register_send and register_receive are
* called (split up into two three-second sleeps between the notices,
* so that it doesn't seem like so long when you're watching :-). The
* amount of time to sleep is configurable in the OS-dependent include
* file by defining DLPI_FIRST_SEND_WAIT to be the number of seconds
* to sleep.
*/
#ifndef lint
static char copyright[] =
"$Id: dlpi.c,v 1.3 2005/08/11 17:13:21 drochner Exp $ Copyright (c) 2004 Internet Systems Consortium. All rights reserved.\n";
#endif /* not lint */
#include "dhcpd.h"
#if defined (USE_DLPI_SEND) || defined (USE_DLPI_RECEIVE)
# include <sys/ioctl.h>
# include <sys/time.h>
# include <sys/dlpi.h>
# include <stropts.h>
# ifdef USE_DLPI_PFMOD
# include <sys/pfmod.h>
# endif
# ifdef USE_POLL
# include <poll.h>
# endif
# include <netinet/in_systm.h>
# include "includes/netinet/ip.h"
# include "includes/netinet/udp.h"
# include "includes/netinet/if_ether.h"
# ifdef USE_DLPI_PFMOD
# ifdef USE_DLPI_RAW
# define DLPI_MODNAME "DLPI+RAW+PFMOD"
# else
# define DLPI_MODNAME "DLPI+PFMOD"
# endif
# else
# ifdef USE_DLPI_RAW
# define DLPI_MODNAME "DLPI+RAW"
# else
# define DLPI_MODNAME "DLPI"
# endif
# endif
# ifndef ABS
# define ABS(x) ((x) >= 0 ? (x) : 0-(x))
# endif
static int strioctl PROTO ((int fd, int cmd, int timeout, int len, char *dp));
#define DLPI_MAXDLBUF 8192 /* Buffer size */
#define DLPI_MAXDLADDR 1024 /* Max address size */
#define DLPI_DEVDIR "/dev/" /* Device directory */
static int dlpiopen PROTO ((char *ifname));
static int dlpiunit PROTO ((char *ifname));
static int dlpiinforeq PROTO ((int fd));
static int dlpiphysaddrreq PROTO ((int fd, unsigned long addrtype));
static int dlpiattachreq PROTO ((int fd, unsigned long ppa));
static int dlpibindreq PROTO ((int fd, unsigned long sap, unsigned long max_conind,
unsigned long service_mode, unsigned long conn_mgmt,
unsigned long xidtest));
static int dlpidetachreq PROTO ((int fd));
static int dlpiunbindreq PROTO ((int fd));
static int dlpiokack PROTO ((int fd, char *bufp));
static int dlpiinfoack PROTO ((int fd, char *bufp));
static int dlpiphysaddrack PROTO ((int fd, char *bufp));
static int dlpibindack PROTO ((int fd, char *bufp));
static int dlpiunitdatareq PROTO ((int fd, unsigned char *addr,
int addrlen, unsigned long minpri,
unsigned long maxpri, unsigned char *data,
int datalen));
static int dlpiunitdataind PROTO ((int fd,
unsigned char *dstaddr,
unsigned long *dstaddrlen,
unsigned char *srcaddr,
unsigned long *srcaddrlen,
unsigned long *grpaddr,
unsigned char *data,
int datalen));
# ifndef USE_POLL
static void sigalrm PROTO ((int sig));
# endif
static int expected PROTO ((unsigned long prim, union DL_primitives *dlp,
int msgflags));
static int strgetmsg PROTO ((int fd, struct strbuf *ctlp,
struct strbuf *datap, int *flagsp,
char *caller));
/* Reinitializes the specified interface after an address change. This
is not required for packet-filter APIs. */
#ifdef USE_DLPI_SEND
void if_reinitialize_send (info)
struct interface_info *info;
{
}
#endif
#ifdef USE_DLPI_RECEIVE
void if_reinitialize_receive (info)
struct interface_info *info;
{
}
#endif
/* Called by get_interface_list for each interface that's discovered.
Opens a packet filter for each interface and adds it to the select
mask. */
int if_register_dlpi (info)
struct interface_info *info;
{
int sock;
int unit;
long buf [DLPI_MAXDLBUF];
union DL_primitives *dlp;
dlp = (union DL_primitives *)buf;
/* Open a DLPI device */
if ((sock = dlpiopen (info -> name)) < 0) {
log_fatal ("Can't open DLPI device for %s: %m", info -> name);
}
/*
* Submit a DL_INFO_REQ request, to find the dl_mac_type and
* dl_provider_style
*/
if (dlpiinforeq(sock) < 0 || dlpiinfoack(sock, (char *)buf) < 0) {
log_fatal ("Can't get DLPI MAC type for %s: %m", info -> name);
} else {
switch (dlp -> info_ack.dl_mac_type) {
case DL_CSMACD: /* IEEE 802.3 */
case DL_ETHER:
info -> hw_address.hbuf [0] = HTYPE_ETHER;
break;
/* adding token ring 5/1999 - mayer@ping.at */
case DL_TPR:
info -> hw_address.hbuf [0] = HTYPE_IEEE802;
break;
case DL_FDDI:
info -> hw_address.hbuf [0] = HTYPE_FDDI;
break;
default:
log_fatal ("%s: unsupported DLPI MAC type %ld",
info -> name, dlp -> info_ack.dl_mac_type);
break;
}
/*
* copy the sap length and broadcast address of this interface
* to interface_info. This fixes nothing but seemed nicer than to
* assume -2 and ffffff.
*/
info -> dlpi_sap_length = dlp -> info_ack.dl_sap_length;
info -> dlpi_broadcast_addr.hlen =
dlp -> info_ack.dl_brdcst_addr_length;
memcpy (info -> dlpi_broadcast_addr.hbuf,
(char *)dlp + dlp -> info_ack.dl_brdcst_addr_offset,
dlp -> info_ack.dl_brdcst_addr_length);
}
if (dlp -> info_ack.dl_provider_style == DL_STYLE2) {
/*
* Attach to the device. If this fails, the device
* does not exist.
*/
unit = dlpiunit (info -> name);
if (dlpiattachreq (sock, unit) < 0
|| dlpiokack (sock, (char *)buf) < 0) {
log_fatal ("Can't attach DLPI device for %s: %m", info -> name);
}
}
/*
* Bind to the IP service access point (SAP), connectionless (CLDLS).
*/
if (dlpibindreq (sock, ETHERTYPE_IP, 0, DL_CLDLS, 0, 0) < 0
|| dlpibindack (sock, (char *)buf) < 0) {
log_fatal ("Can't bind DLPI device for %s: %m", info -> name);
}
/*
* Submit a DL_PHYS_ADDR_REQ request, to find
* the hardware address
*/
if (dlpiphysaddrreq (sock, DL_CURR_PHYS_ADDR) < 0
|| dlpiphysaddrack (sock, (char *)buf) < 0) {
log_fatal ("Can't get DLPI hardware address for %s: %m",
info -> name);
}
info -> hw_address.hlen = dlp -> physaddr_ack.dl_addr_length + 1;
memcpy (&info -> hw_address.hbuf [1],
(char *)buf + dlp -> physaddr_ack.dl_addr_offset,
dlp -> physaddr_ack.dl_addr_length);
#ifdef USE_DLPI_RAW
if (strioctl (sock, DLIOCRAW, INFTIM, 0, 0) < 0) {
log_fatal ("Can't set DLPI RAW mode for %s: %m",
info -> name);
}
#endif
#ifdef USE_DLPI_PFMOD
if (ioctl (sock, I_PUSH, "pfmod") < 0) {
log_fatal ("Can't push packet filter onto DLPI for %s: %m",
info -> name);
}
#endif
return sock;
}
static int
strioctl (fd, cmd, timeout, len, dp)
int fd;
int cmd;
int timeout;
int len;
char *dp;
{
struct strioctl sio;
int rslt;
sio.ic_cmd = cmd;
sio.ic_timout = timeout;
sio.ic_len = len;
sio.ic_dp = dp;
if ((rslt = ioctl (fd, I_STR, &sio)) < 0) {
return rslt;
} else {
return sio.ic_len;
}
}
#ifdef USE_DLPI_SEND
void if_register_send (info)
struct interface_info *info;
{
/* If we're using the DLPI API for sending and receiving,
we don't need to register this interface twice. */
#ifndef USE_DLPI_RECEIVE
# ifdef USE_DLPI_PFMOD
struct packetfilt pf;
# endif
info -> wfdesc = if_register_dlpi (info);
# ifdef USE_DLPI_PFMOD
/* Set up an PFMOD filter that rejects everything... */
pf.Pf_Priority = 0;
pf.Pf_FilterLen = 1;
pf.Pf_Filter [0] = ENF_PUSHZERO;
/* Install the filter */
if (strioctl (info -> wfdesc, PFIOCSETF, INFTIM,
sizeof (pf), (char *)&pf) < 0) {
log_fatal ("Can't set PFMOD send filter on %s: %m", info -> name);
}
# endif /* USE_DLPI_PFMOD */
#else /* !defined (USE_DLPI_RECEIVE) */
/*
* If using DLPI for both send and receive, simply re-use
* the read file descriptor that was set up earlier.
*/
info -> wfdesc = info -> rfdesc;
#endif
if (!quiet_interface_discovery)
log_info ("Sending on DLPI/%s/%s%s%s",
info -> name,
print_hw_addr (info -> hw_address.hbuf [0],
info -> hw_address.hlen - 1,
&info -> hw_address.hbuf [1]),
(info -> shared_network ? "/" : ""),
(info -> shared_network ?
info -> shared_network -> name : ""));
#ifdef DLPI_FIRST_SEND_WAIT
/* See the implementation notes at the beginning of this file */
# ifdef USE_DLPI_RECEIVE
sleep (DLPI_FIRST_SEND_WAIT - (DLPI_FIRST_SEND_WAIT / 2));
# else
sleep (DLPI_FIRST_SEND_WAIT);
# endif
#endif
}
void if_deregister_send (info)
struct interface_info *info;
{
/* If we're using the DLPI API for sending and receiving,
we don't need to register this interface twice. */
#ifndef USE_DLPI_RECEIVE
close (info -> wfdesc);
#endif
info -> wfdesc = -1;
if (!quiet_interface_discovery)
log_info ("Disabling output on DLPI/%s/%s%s%s",
info -> name,
print_hw_addr (info -> hw_address.hbuf [0],
info -> hw_address.hlen - 1,
&info -> hw_address.hbuf [1]),
(info -> shared_network ? "/" : ""),
(info -> shared_network ?
info -> shared_network -> name : ""));
}
#endif /* USE_DLPI_SEND */
#ifdef USE_DLPI_RECEIVE
/* Packet filter program...
XXX Changes to the filter program may require changes to the constant
offsets used in if_register_send to patch the NIT program! XXX */
void if_register_receive (info)
struct interface_info *info;
{
#ifdef USE_DLPI_PFMOD
struct packetfilt pf;
struct ip iphdr;
u_int16_t offset;
#endif
/* Open a DLPI device and hang it on this interface... */
info -> rfdesc = if_register_dlpi (info);
#ifdef USE_DLPI_PFMOD
/* Set up the PFMOD filter program. */
/* XXX Unlike the BPF filter program, this one won't work if the
XXX IP packet is fragmented or if there are options on the IP
XXX header. */
pf.Pf_Priority = 0;
pf.Pf_FilterLen = 0;
#if defined (USE_DLPI_RAW)
# define ETHER_H_PREFIX (14) /* sizeof (ethernet_header) */
/*
* ethertype == ETHERTYPE_IP
*/
offset = 12;
pf.Pf_Filter [pf.Pf_FilterLen++] = ENF_PUSHWORD + (offset / 2);
pf.Pf_Filter [pf.Pf_FilterLen++] = ENF_PUSHLIT | ENF_CAND;
pf.Pf_Filter [pf.Pf_FilterLen++] = htons (ETHERTYPE_IP);
# else
# define ETHER_H_PREFIX (0)
# endif /* USE_DLPI_RAW */
/*
* The packets that will be received on this file descriptor
* will be IP packets (due to the SAP that was specified in
* the dlbind call). There will be no ethernet header.
* Therefore, setup the packet filter to check the protocol
* field for UDP, and the destination port number equal
* to the local port. All offsets are relative to the start
* of an IP packet.
*/
/*
* BOOTPS destination port
*/
offset = ETHER_H_PREFIX + sizeof (iphdr) + sizeof (u_int16_t);
pf.Pf_Filter [pf.Pf_FilterLen++] = ENF_PUSHWORD + (offset / 2);
pf.Pf_Filter [pf.Pf_FilterLen++] = ENF_PUSHLIT | ENF_CAND;
pf.Pf_Filter [pf.Pf_FilterLen++] = local_port;
/*
* protocol should be udp. this is a byte compare, test for
* endianess.
*/
offset = ETHER_H_PREFIX + ((u_int8_t *)&(iphdr.ip_p) - (u_int8_t *)&iphdr);
pf.Pf_Filter [pf.Pf_FilterLen++] = ENF_PUSHWORD + (offset / 2);
pf.Pf_Filter [pf.Pf_FilterLen++] = ENF_PUSHLIT | ENF_AND;
pf.Pf_Filter [pf.Pf_FilterLen++] = htons (0x00FF);
pf.Pf_Filter [pf.Pf_FilterLen++] = ENF_PUSHLIT | ENF_CAND;
pf.Pf_Filter [pf.Pf_FilterLen++] = htons (IPPROTO_UDP);
/* Install the filter... */
if (strioctl (info -> rfdesc, PFIOCSETF, INFTIM,
sizeof (pf), (char *)&pf) < 0) {
log_fatal ("Can't set PFMOD receive filter on %s: %m", info -> name);
}
#endif /* USE_DLPI_PFMOD */
if (!quiet_interface_discovery)
log_info ("Listening on DLPI/%s/%s%s%s",
info -> name,
print_hw_addr (info -> hw_address.hbuf [0],
info -> hw_address.hlen - 1,
&info -> hw_address.hbuf [1]),
(info -> shared_network ? "/" : ""),
(info -> shared_network ?
info -> shared_network -> name : ""));
#ifdef DLPI_FIRST_SEND_WAIT
/* See the implementation notes at the beginning of this file */
# ifdef USE_DLPI_SEND
sleep (DLPI_FIRST_SEND_WAIT / 2);
# else
sleep (DLPI_FIRST_SEND_WAIT);
# endif
#endif
}
void if_deregister_receive (info)
struct interface_info *info;
{
/* If we're using the DLPI API for sending and receiving,
we don't need to register this interface twice. */
#ifndef USE_DLPI_SEND
close (info -> rfdesc);
#endif
info -> rfdesc = -1;
if (!quiet_interface_discovery)
log_info ("Disabling input on DLPI/%s/%s%s%s",
info -> name,
print_hw_addr (info -> hw_address.hbuf [0],
info -> hw_address.hlen - 1,
&info -> hw_address.hbuf [1]),
(info -> shared_network ? "/" : ""),
(info -> shared_network ?
info -> shared_network -> name : ""));
}
#endif /* USE_DLPI_RECEIVE */
#ifdef USE_DLPI_SEND
ssize_t send_packet (interface, packet, raw, len, from, to, hto)
struct interface_info *interface;
struct packet *packet;
struct dhcp_packet *raw;
size_t len;
struct in_addr from;
struct sockaddr_in *to;
struct hardware *hto;
{
unsigned hbufp = 0;
double hh [32];
double ih [1536 / sizeof (double)];
unsigned char *dbuf = (unsigned char *)ih;
unsigned dbuflen;
unsigned char dstaddr [DLPI_MAXDLADDR];
unsigned addrlen;
int result;
int fudge;
if (!strcmp (interface -> name, "fallback"))
return send_fallback (interface, packet, raw,
len, from, to, hto);
dbuflen = 0;
/* Assemble the headers... */
#ifdef USE_DLPI_RAW
assemble_hw_header (interface, (unsigned char *)hh, &dbuflen, hto);
if (dbuflen > sizeof hh)
log_fatal ("send_packet: hh buffer too small.\n");
fudge = dbuflen % 4; /* IP header must be word-aligned. */
memcpy (dbuf + fudge, (unsigned char *)hh, dbuflen);
dbuflen += fudge;
#else
fudge = 0;
#endif
assemble_udp_ip_header (interface, dbuf, &dbuflen, from.s_addr,
to -> sin_addr.s_addr, to -> sin_port,
(unsigned char *)raw, len);
/* Copy the data into the buffer (yuk). */
memcpy (dbuf + dbuflen, raw, len);
dbuflen += len;
#ifdef USE_DLPI_RAW
result = write (interface -> wfdesc, dbuf + fudge, dbuflen - fudge);
#else
/*
* Setup the destination address (DLSAP) in dstaddr
*
* If sap_length < 0 we must deliver the DLSAP as phys+sap.
* If sap_length > 0 we must deliver the DLSAP as sap+phys.
*
* sap = Service Access Point == ETHERTYPE_IP
* sap + datalink address is called DLSAP in dlpi speak.
*/
{ /* ENCODE DLSAP */
unsigned char phys [DLPI_MAXDLADDR];
unsigned char sap [4];
int sap_len = interface -> dlpi_sap_length;
int phys_len = interface -> hw_address.hlen - 1;
/* sap = htons (ETHERTYPE_IP) kludge */
memset (sap, 0, sizeof (sap));
# if (BYTE_ORDER == LITTLE_ENDIAN)
sap [0] = 0x00;
sap [1] = 0x08;
# else
sap [0] = 0x08;
sap [1] = 0x00;
# endif
if (hto && hto -> hlen == interface -> hw_address.hlen)
memcpy ( phys, (char *) &hto -> hbuf [1], phys_len);
else
memcpy ( phys, interface -> dlpi_broadcast_addr.hbuf,
interface -> dlpi_broadcast_addr.hlen);
if (sap_len < 0) {
memcpy ( dstaddr, phys, phys_len);
memcpy ( (char *) &dstaddr [phys_len], sap, ABS (sap_len));
}
else {
memcpy ( dstaddr, (void *) sap, sap_len);
memcpy ( (char *) &dstaddr [sap_len], phys, phys_len);
}
addrlen = phys_len + ABS (sap_len);
} /* ENCODE DLSAP */
result = dlpiunitdatareq (interface -> wfdesc, dstaddr, addrlen,
0, 0, dbuf, dbuflen);
#endif /* USE_DLPI_RAW */
if (result < 0)
log_error ("send_packet: %m");
return result;
}
#endif /* USE_DLPI_SEND */
#ifdef USE_DLPI_RECEIVE
ssize_t receive_packet (interface, buf, len, from, hfrom)
struct interface_info *interface;
unsigned char *buf;
size_t len;
struct sockaddr_in *from;
struct hardware *hfrom;
{
unsigned char dbuf [1536];
unsigned char srcaddr [DLPI_MAXDLADDR];
unsigned long srcaddrlen;
int flags = 0;
int length = 0;
int offset = 0;
int rslt;
int bufix = 0;
#ifdef USE_DLPI_RAW
length = read (interface -> rfdesc, dbuf, sizeof (dbuf));
#else
length = dlpiunitdataind (interface -> rfdesc, (unsigned char *)NULL,
(unsigned long *)NULL, srcaddr, &srcaddrlen,
(unsigned long *)NULL, dbuf, sizeof (dbuf));
#endif
if (length <= 0) {
return length;
}
# if !defined (USE_DLPI_RAW)
/*
* Copy the sender's hw address into hfrom
* If sap_len < 0 the DLSAP is as phys+sap.
* If sap_len > 0 the DLSAP is as sap+phys.
*
* sap is discarded here.
*/
{ /* DECODE DLSAP */
int sap_len = interface -> dlpi_sap_length;
int phys_len = interface -> hw_address.hlen - 1;
if (hfrom && (srcaddrlen == ABS (sap_len) + phys_len )) {
hfrom -> hbuf [0] = interface -> hw_address.hbuf [0];
hfrom -> hlen = interface -> hw_address.hlen;
if (sap_len < 0) {
memcpy ((char *) &hfrom -> hbuf [1], srcaddr, phys_len);
}
else {
memcpy ((char *) &hfrom -> hbuf [1], (char *) &srcaddr [phys_len],
phys_len);
}
}
else if (hfrom) {
memset (hfrom, '\0', sizeof *hfrom);
}
} /* DECODE_DLSAP */
# endif /* !defined (USE_DLPI_RAW) */
/* Decode the IP and UDP headers... */
bufix = 0;
#ifdef USE_DLPI_RAW
/* Decode the physical header... */
offset = decode_hw_header (interface, dbuf, bufix, hfrom);
/* If a physical layer checksum failed (dunno of any
physical layer that supports this, but WTH), skip this
packet. */
if (offset < 0) {
return 0;
}
bufix += offset;
length -= offset;
#endif
offset = decode_udp_ip_header (interface, dbuf, bufix,
from, length);
/* If the IP or UDP checksum was bad, skip the packet... */
if (offset < 0) {
return 0;
}
bufix += offset;
length -= offset;
/* Copy out the data in the packet... */
memcpy (buf, &dbuf [bufix], length);
return length;
}
#endif
/* Common DLPI routines ...
*
* Written by Eric James Negaard, <lmdejn@lmd.ericsson.se>
*
* Based largely in part to the example code contained in the document
* "How to Use the STREAMS Data Link Provider Interface (DLPI)", written
* by Neal Nuckolls of SunSoft Internet Engineering.
*
* This code has been developed and tested on sparc-based machines running
* SunOS 5.5.1, with le and hme network interfaces. It should be pretty
* generic, though.
*
* The usual disclaimers apply. This code works for me. Don't blame me
* if it makes your machine or network go down in flames. That taken
* into consideration, use this code as you wish. If you make usefull
* modifications I'd appreciate hearing about it.
*/
#define DLPI_MAXWAIT 15 /* Max timeout */
/*
* Parse an interface name and extract the unit number
*/
static int dlpiunit (ifname)
char *ifname;
{
int fd;
char *cp, *dp, *ep;
int unit;
if (!ifname) {
return 0;
}
/* Advance to the end of the name */
cp = ifname;
while (*cp) cp++;
/* Back up to the start of the first digit */
while ((*(cp-1) >= '0' && *(cp-1) <= '9') || *(cp - 1) == ':') cp--;
/* Convert the unit number */
unit = 0;
while (*cp >= '0' && *cp <= '9') {
unit *= 10;
unit += (*cp++ - '0');
}
return unit;
}
/*
* dlpiopen - open the DLPI device for a given interface name
*/
static int dlpiopen (ifname)
char *ifname;
{
char devname [50];
char *cp, *dp, *ep;
if (!ifname) {
return -1;
}
/* Open a DLPI device */
if (*ifname == '/') {
dp = devname;
} else {
/* Prepend the device directory */
memcpy (devname, DLPI_DEVDIR, strlen (DLPI_DEVDIR));
dp = &devname [strlen (DLPI_DEVDIR)];
}
/* Find the end of the interface name */
ep = cp = ifname;
while (*ep)
ep++;
/* And back up to the first digit (unit number) */
while ((*(ep - 1) >= '0' && *(ep - 1) <= '9') || *(ep - 1) == ':')
ep--;
/* Copy everything up to the unit number */
while (cp < ep) {
*dp++ = *cp++;
}
*dp = '\0';
return open (devname, O_RDWR, 0);
}
/*
* dlpiinforeq - request information about the data link provider.
*/
static int dlpiinforeq (fd)
int fd;
{
dl_info_req_t info_req;
struct strbuf ctl;
int flags;
info_req.dl_primitive = DL_INFO_REQ;
ctl.maxlen = 0;
ctl.len = sizeof (info_req);
ctl.buf = (char *)&info_req;
flags = RS_HIPRI;
return putmsg (fd, &ctl, (struct strbuf *)NULL, flags);
}
/*
* dlpiphysaddrreq - request the current physical address.
*/
static int dlpiphysaddrreq (fd, addrtype)
int fd;
unsigned long addrtype;
{
dl_phys_addr_req_t physaddr_req;
struct strbuf ctl;
int flags;
physaddr_req.dl_primitive = DL_PHYS_ADDR_REQ;
physaddr_req.dl_addr_type = addrtype;
ctl.maxlen = 0;
ctl.len = sizeof (physaddr_req);
ctl.buf = (char *)&physaddr_req;
flags = RS_HIPRI;
return putmsg (fd, &ctl, (struct strbuf *)NULL, flags);
}
/*
* dlpiattachreq - send a request to attach to a specific unit.
*/
static int dlpiattachreq (fd, ppa)
unsigned long ppa;
int fd;
{
dl_attach_req_t attach_req;
struct strbuf ctl;
int flags;
attach_req.dl_primitive = DL_ATTACH_REQ;
attach_req.dl_ppa = ppa;
ctl.maxlen = 0;
ctl.len = sizeof (attach_req);
ctl.buf = (char *)&attach_req;
flags = 0;
return putmsg (fd, &ctl, (struct strbuf*)NULL, flags);
}
/*
* dlpibindreq - send a request to bind to a specific SAP address.
*/
static int dlpibindreq (fd, sap, max_conind, service_mode, conn_mgmt, xidtest)
unsigned long sap;
unsigned long max_conind;
unsigned long service_mode;
unsigned long conn_mgmt;
unsigned long xidtest;
int fd;
{
dl_bind_req_t bind_req;
struct strbuf ctl;
int flags;
bind_req.dl_primitive = DL_BIND_REQ;
bind_req.dl_sap = sap;
bind_req.dl_max_conind = max_conind;
bind_req.dl_service_mode = service_mode;
bind_req.dl_conn_mgmt = conn_mgmt;
bind_req.dl_xidtest_flg = xidtest;
ctl.maxlen = 0;
ctl.len = sizeof (bind_req);
ctl.buf = (char *)&bind_req;
flags = 0;
return putmsg (fd, &ctl, (struct strbuf*)NULL, flags);
}
/*
* dlpiunbindreq - send a request to unbind.
*/
static int dlpiunbindreq (fd)
int fd;
{
dl_unbind_req_t unbind_req;
struct strbuf ctl;
int flags;
unbind_req.dl_primitive = DL_UNBIND_REQ;
ctl.maxlen = 0;
ctl.len = sizeof (unbind_req);
ctl.buf = (char *)&unbind_req;
flags = 0;
return putmsg (fd, &ctl, (struct strbuf*)NULL, flags);
}
/*
* dlpidetachreq - send a request to detach.
*/
static int dlpidetachreq (fd)
int fd;
{
dl_detach_req_t detach_req;
struct strbuf ctl;
int flags;
detach_req.dl_primitive = DL_DETACH_REQ;
ctl.maxlen = 0;
ctl.len = sizeof (detach_req);
ctl.buf = (char *)&detach_req;
flags = 0;
return putmsg (fd, &ctl, (struct strbuf*)NULL, flags);
}
/*
* dlpibindack - receive an ack to a dlbindreq.
*/
static int dlpibindack (fd, bufp)
char *bufp;
int fd;
{
union DL_primitives *dlp;
struct strbuf ctl;
int flags;
ctl.maxlen = DLPI_MAXDLBUF;
ctl.len = 0;
ctl.buf = bufp;
if (strgetmsg (fd, &ctl,
(struct strbuf*)NULL, &flags, "dlpibindack") < 0) {
return -1;
}
dlp = (union DL_primitives *)ctl.buf;
if (!expected (DL_BIND_ACK, dlp, flags) < 0) {
return -1;
}
if (ctl.len < sizeof (dl_bind_ack_t)) {
/* Returned structure is too short */
return -1;
}
return 0;
}
/*
* dlpiokack - general acknowledgement reception.
*/
static int dlpiokack (fd, bufp)
char *bufp;
int fd;
{
union DL_primitives *dlp;
struct strbuf ctl;
int flags;
ctl.maxlen = DLPI_MAXDLBUF;
ctl.len = 0;
ctl.buf = bufp;
if (strgetmsg (fd, &ctl,
(struct strbuf*)NULL, &flags, "dlpiokack") < 0) {
return -1;
}
dlp = (union DL_primitives *)ctl.buf;
if (!expected (DL_OK_ACK, dlp, flags) < 0) {
return -1;
}
if (ctl.len < sizeof (dl_ok_ack_t)) {
/* Returned structure is too short */
return -1;
}
return 0;
}
/*
* dlpiinfoack - receive an ack to a dlinforeq.
*/
static int dlpiinfoack (fd, bufp)
char *bufp;
int fd;
{
union DL_primitives *dlp;
struct strbuf ctl;
int flags;
ctl.maxlen = DLPI_MAXDLBUF;
ctl.len = 0;
ctl.buf = bufp;
if (strgetmsg (fd, &ctl, (struct strbuf *)NULL, &flags,
"dlpiinfoack") < 0) {
return -1;
}
dlp = (union DL_primitives *) ctl.buf;
if (!expected (DL_INFO_ACK, dlp, flags) < 0) {
return -1;
}
if (ctl.len < sizeof (dl_info_ack_t)) {
/* Returned structure is too short */
return -1;
}
return 0;
}
/*
* dlpiphysaddrack - receive an ack to a dlpiphysaddrreq.
*/
int dlpiphysaddrack (fd, bufp)
char *bufp;
int fd;
{
union DL_primitives *dlp;
struct strbuf ctl;
int flags;
ctl.maxlen = DLPI_MAXDLBUF;
ctl.len = 0;
ctl.buf = bufp;
if (strgetmsg (fd, &ctl, (struct strbuf *)NULL, &flags,
"dlpiphysaddrack") < 0) {
return -1;
}
dlp = (union DL_primitives *)ctl.buf;
if (!expected (DL_PHYS_ADDR_ACK, dlp, flags) < 0) {
return -1;
}
if (ctl.len < sizeof (dl_phys_addr_ack_t)) {
/* Returned structure is too short */
return -1;
}
return 0;
}
int dlpiunitdatareq (fd, addr, addrlen, minpri, maxpri, dbuf, dbuflen)
int fd;
unsigned char *addr;
int addrlen;
unsigned long minpri;
unsigned long maxpri;
unsigned char *dbuf;
int dbuflen;
{
long buf [DLPI_MAXDLBUF];
union DL_primitives *dlp;
struct strbuf ctl, data;
/* Set up the control information... */
dlp = (union DL_primitives *)buf;
dlp -> unitdata_req.dl_primitive = DL_UNITDATA_REQ;
dlp -> unitdata_req.dl_dest_addr_length = addrlen;
dlp -> unitdata_req.dl_dest_addr_offset = sizeof (dl_unitdata_req_t);
dlp -> unitdata_req.dl_priority.dl_min = minpri;
dlp -> unitdata_req.dl_priority.dl_max = maxpri;
/* Append the destination address */
memcpy ((char *)buf + dlp -> unitdata_req.dl_dest_addr_offset,
addr, addrlen);
ctl.maxlen = 0;
ctl.len = dlp -> unitdata_req.dl_dest_addr_offset + addrlen;
ctl.buf = (char *)buf;
data.maxlen = 0;
data.buf = (char *)dbuf;
data.len = dbuflen;
/* Send the packet down the wire... */
return putmsg (fd, &ctl, &data, 0);
}
static int dlpiunitdataind (fd, daddr, daddrlen,
saddr, saddrlen, grpaddr, dbuf, dlen)
int fd;
unsigned char *daddr;
unsigned long *daddrlen;
unsigned char *saddr;
unsigned long *saddrlen;
unsigned long *grpaddr;
unsigned char *dbuf;
int dlen;
{
long buf [DLPI_MAXDLBUF];
union DL_primitives *dlp;
struct strbuf ctl, data;
int flags = 0;
int result;
/* Set up the msg_buf structure... */
dlp = (union DL_primitives *)buf;
dlp -> unitdata_ind.dl_primitive = DL_UNITDATA_IND;
ctl.maxlen = DLPI_MAXDLBUF;
ctl.len = 0;
ctl.buf = (char *)buf;
data.maxlen = dlen;
data.len = 0;
data.buf = (char *)dbuf;
result = getmsg (fd, &ctl, &data, &flags);
if (result != 0) {
return -1;
}
if (ctl.len < sizeof (dl_unitdata_ind_t) ||
dlp -> unitdata_ind.dl_primitive != DL_UNITDATA_IND) {
return -1;
}
if (data.len <= 0) {
return data.len;
}
/* Copy sender info */
if (saddr) {
memcpy (saddr,
(char *)buf + dlp -> unitdata_ind.dl_src_addr_offset,
dlp -> unitdata_ind.dl_src_addr_length);
}
if (saddrlen) {
*saddrlen = dlp -> unitdata_ind.dl_src_addr_length;
}
/* Copy destination info */
if (daddr) {
memcpy (daddr,
(char *)buf + dlp -> unitdata_ind.dl_dest_addr_offset,
dlp -> unitdata_ind.dl_dest_addr_length);
}
if (daddrlen) {
*daddrlen = dlp -> unitdata_ind.dl_dest_addr_length;
}
if (grpaddr) {
*grpaddr = dlp -> unitdata_ind.dl_group_address;
}
return data.len;
}
/*
* expected - see if we got what we wanted.
*/
static int expected (prim, dlp, msgflags)
unsigned long prim;
union DL_primitives *dlp;
int msgflags;
{
if (msgflags != RS_HIPRI) {
/* Message was not M_PCPROTO */
return 0;
}
if (dlp -> dl_primitive != prim) {
/* Incorrect/unexpected return message */
return 0;
}
return 1;
}
/*
* strgetmsg - get a message from a stream, with timeout.
*/
static int strgetmsg (fd, ctlp, datap, flagsp, caller)
struct strbuf *ctlp, *datap;
char *caller;
int *flagsp;
int fd;
{
int result;
#ifdef USE_POLL
struct pollfd pfd;
int count;
time_t now;
time_t starttime;
int to_msec;
#endif
#ifdef USE_POLL
pfd.fd = fd;
pfd.events = POLLPRI; /* We're only interested in knowing
* when we can receive the next high
* priority message.
*/
pfd.revents = 0;
now = time (&starttime);
while (now <= starttime + DLPI_MAXWAIT) {
to_msec = ((starttime + DLPI_MAXWAIT) - now) * 1000;
count = poll (&pfd, 1, to_msec);
if (count == 0) {
/* log_fatal ("strgetmsg: timeout"); */
return -1;
} else if (count < 0) {
if (errno == EAGAIN || errno == EINTR) {
time (&now);
continue;
} else {
/* log_fatal ("poll: %m"); */
return -1;
}
} else {
break;
}
}
#else /* defined (USE_POLL) */
/*
* Start timer. Can't use select, since it might return true if there
* were non High-Priority data available on the stream.
*/
(void) sigset (SIGALRM, sigalrm);
if (alarm (DLPI_MAXWAIT) < 0) {
/* log_fatal ("alarm: %m"); */
return -1;
}
#endif /* !defined (USE_POLL) */
/*
* Set flags argument and issue getmsg ().
*/
*flagsp = 0;
if ((result = getmsg (fd, ctlp, datap, flagsp)) < 0) {
return result;
}
#ifndef USE_POLL
/*
* Stop timer.
*/
if (alarm (0) < 0) {
/* log_fatal ("alarm: %m"); */
return -1;
}
#endif
/*
* Check for MOREDATA and/or MORECTL.
*/
if (result & (MORECTL|MOREDATA)) {
return -1;
}
/*
* Check for at least sizeof (long) control data portion.
*/
if (ctlp -> len < sizeof (long)) {
return -1;
}
return 0;
}
#ifndef USE_POLL
/*
* sigalrm - handle alarms.
*/
static void sigalrm (sig)
int sig;
{
fprintf (stderr, "strgetmsg: timeout");
exit (1);
}
#endif /* !defined (USE_POLL) */
int can_unicast_without_arp (ip)
struct interface_info *ip;
{
return 1;
}
int can_receive_unicast_unconfigured (ip)
struct interface_info *ip;
{
return 1;
}
int supports_multiple_interfaces (ip)
struct interface_info *ip;
{
return 1;
}
void maybe_setup_fallback ()
{
isc_result_t status;
struct interface_info *fbi = (struct interface_info *)0;
if (setup_fallback (&fbi, MDL)) {
if_register_fallback (fbi);
status = omapi_register_io_object ((omapi_object_t *)fbi,
if_readsocket, 0,
fallback_discard, 0, 0);
if (status != ISC_R_SUCCESS)
log_fatal ("Can't register I/O handle for %s: %s",
fbi -> name, isc_result_totext (status));
interface_dereference (&fbi, MDL);
}
}
#endif /* USE_DLPI */
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