streams.c

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    1 /*-
    2  * Copyright (c) 1998 Mark Newton
    3  * Copyright (c) 1994 Christos Zoulas
    4  * Copyright (c) 1997 Todd Vierling
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. The names of the authors may not be used to endorse or promote products
   16  *    derived from this software without specific prior written permission
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   28  *
   29  * Stolen from NetBSD /sys/compat/svr4/svr4_net.c.  Pseudo-device driver
   30  * skeleton produced from /usr/share/examples/drivers/make_pseudo_driver.sh
   31  * in 3.0-980524-SNAP then hacked a bit (but probably not enough :-).
   32  *
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD$");
   37 
   38 #include <sys/param.h>
   39 #include <sys/systm.h>
   40 #include <sys/kernel.h>         /* SYSINIT stuff */
   41 #include <sys/conf.h>           /* cdevsw stuff */
   42 #include <sys/malloc.h>         /* malloc region definitions */
   43 #include <sys/file.h>
   44 #include <sys/filedesc.h>
   45 #include <sys/unistd.h>
   46 #include <sys/fcntl.h>
   47 #include <sys/socket.h>
   48 #include <sys/protosw.h>
   49 #include <sys/socketvar.h>
   50 #include <sys/syscallsubr.h>
   51 #include <sys/un.h>
   52 #include <sys/domain.h>
   53 #include <net/if.h>
   54 #include <netinet/in.h>
   55 #include <sys/proc.h>
   56 #include <sys/uio.h>
   57 
   58 #include <sys/sysproto.h>
   59 
   60 #include <compat/svr4/svr4_types.h>
   61 #include <compat/svr4/svr4_util.h>
   62 #include <compat/svr4/svr4_signal.h>
   63 #include <compat/svr4/svr4_ioctl.h>
   64 #include <compat/svr4/svr4_stropts.h>
   65 #include <compat/svr4/svr4_socket.h>
   66 
   67 static int svr4_soo_close(struct file *, struct thread *);
   68 static int svr4_ptm_alloc(struct thread *);
   69 static  d_open_t        streamsopen;
   70 
   71 /*
   72  * Device minor numbers
   73  */
   74 enum {
   75         dev_ptm                 = 10,
   76         dev_arp                 = 26,
   77         dev_icmp                = 27,
   78         dev_ip                  = 28,
   79         dev_tcp                 = 35,
   80         dev_udp                 = 36,
   81         dev_rawip               = 37,
   82         dev_unix_dgram          = 38,
   83         dev_unix_stream         = 39,
   84         dev_unix_ord_stream     = 40
   85 };
   86 
   87 static struct cdev *dt_ptm, *dt_arp, *dt_icmp, *dt_ip, *dt_tcp, *dt_udp,
   88         *dt_rawip, *dt_unix_dgram, *dt_unix_stream, *dt_unix_ord_stream;
   89 
   90 static struct fileops svr4_netops = {
   91         .fo_read = soo_read,
   92         .fo_write = soo_write,
   93         .fo_truncate = soo_truncate,
   94         .fo_ioctl = soo_ioctl,
   95         .fo_poll = soo_poll,
   96         .fo_kqfilter = soo_kqfilter,
   97         .fo_stat = soo_stat,
   98         .fo_close =  svr4_soo_close
   99 };
  100  
  101 static struct cdevsw streams_cdevsw = {
  102         .d_version =    D_VERSION,
  103         .d_open =       streamsopen,
  104         .d_name =       "streams",
  105 };
  106  
  107 struct streams_softc {
  108         struct isa_device *dev;
  109 } ;
  110 
  111 #define UNIT(dev) dev2unit(dev) /* assume one minor number per unit */
  112 
  113 typedef struct streams_softc *sc_p;
  114 
  115 static  int
  116 streams_modevent(module_t mod, int type, void *unused)
  117 {
  118         switch (type) {
  119         case MOD_LOAD:
  120                 dt_ptm = make_dev(&streams_cdevsw, dev_ptm, 0, 0, 0666,
  121                         "ptm");
  122                 dt_arp = make_dev(&streams_cdevsw, dev_arp, 0, 0, 0666,
  123                         "arp");
  124                 dt_icmp = make_dev(&streams_cdevsw, dev_icmp, 0, 0, 0666,
  125                         "icmp");
  126                 dt_ip = make_dev(&streams_cdevsw, dev_ip, 0, 0, 0666,
  127                         "ip");
  128                 dt_tcp = make_dev(&streams_cdevsw, dev_tcp, 0, 0, 0666,
  129                         "tcp");
  130                 dt_udp = make_dev(&streams_cdevsw, dev_udp, 0, 0, 0666,
  131                         "udp");
  132                 dt_rawip = make_dev(&streams_cdevsw, dev_rawip, 0, 0, 0666,
  133                         "rawip");
  134                 dt_unix_dgram = make_dev(&streams_cdevsw, dev_unix_dgram,
  135                         0, 0, 0666, "ticlts");
  136                 dt_unix_stream = make_dev(&streams_cdevsw, dev_unix_stream,
  137                         0, 0, 0666, "ticots");
  138                 dt_unix_ord_stream = make_dev(&streams_cdevsw,
  139                         dev_unix_ord_stream, 0, 0, 0666, "ticotsord");
  140 
  141                 if (! (dt_ptm && dt_arp && dt_icmp && dt_ip && dt_tcp &&
  142                                 dt_udp && dt_rawip && dt_unix_dgram &&
  143                                 dt_unix_stream && dt_unix_ord_stream)) {
  144                         printf("WARNING: device config for STREAMS failed\n");
  145                         printf("Suggest unloading streams KLD\n");
  146                 }
  147                 return 0;
  148         case MOD_UNLOAD:
  149                 /* XXX should check to see if it's busy first */
  150                 destroy_dev(dt_ptm);
  151                 destroy_dev(dt_arp);
  152                 destroy_dev(dt_icmp);
  153                 destroy_dev(dt_ip);
  154                 destroy_dev(dt_tcp);
  155                 destroy_dev(dt_udp);
  156                 destroy_dev(dt_rawip);
  157                 destroy_dev(dt_unix_dgram);
  158                 destroy_dev(dt_unix_stream);
  159                 destroy_dev(dt_unix_ord_stream);
  160 
  161                 return 0;
  162         default:
  163                 return EOPNOTSUPP;
  164                 break;
  165         }
  166         return 0;
  167 }
  168 
  169 static moduledata_t streams_mod = {
  170         "streams",
  171         streams_modevent,
  172         0
  173 };
  174 DECLARE_MODULE(streams, streams_mod, SI_SUB_DRIVERS, SI_ORDER_ANY);
  175 MODULE_VERSION(streams, 1);
  176 
  177 /*
  178  * We only need open() and close() routines.  open() calls socreate()
  179  * to allocate a "real" object behind the stream and mallocs some state
  180  * info for use by the svr4 emulator;  close() deallocates the state
  181  * information and passes the underlying object to the normal socket close
  182  * routine.
  183  */
  184 static  int
  185 streamsopen(struct cdev *dev, int oflags, int devtype, struct thread *td)
  186 {
  187         struct filedesc *fdp;
  188         struct svr4_strm *st;
  189         struct socket *so;
  190         struct file *fp;
  191         int family, type, protocol;
  192         int error, fd;
  193         
  194         if (td->td_dupfd >= 0)
  195           return ENODEV;
  196 
  197         switch (dev2unit(dev)) {
  198         case dev_udp:
  199           family = AF_INET;
  200           type = SOCK_DGRAM;
  201           protocol = IPPROTO_UDP;
  202           break;
  203 
  204         case dev_tcp:
  205           family = AF_INET;
  206           type = SOCK_STREAM;
  207           protocol = IPPROTO_TCP;
  208           break;
  209 
  210         case dev_ip:
  211         case dev_rawip:
  212           family = AF_INET;
  213           type = SOCK_RAW;
  214           protocol = IPPROTO_IP;
  215           break;
  216 
  217         case dev_icmp:
  218           family = AF_INET;
  219           type = SOCK_RAW;
  220           protocol = IPPROTO_ICMP;
  221           break;
  222 
  223         case dev_unix_dgram:
  224           family = AF_LOCAL;
  225           type = SOCK_DGRAM;
  226           protocol = 0;
  227           break;
  228 
  229         case dev_unix_stream:
  230         case dev_unix_ord_stream:
  231           family = AF_LOCAL;
  232           type = SOCK_STREAM;
  233           protocol = 0;
  234           break;
  235 
  236         case dev_ptm:
  237           return svr4_ptm_alloc(td);
  238 
  239         default:
  240           return EOPNOTSUPP;
  241         }
  242 
  243         fdp = td->td_proc->p_fd;
  244         if ((error = falloc(td, &fp, &fd)) != 0)
  245           return error;
  246         /* An extra reference on `fp' has been held for us by falloc(). */
  247 
  248         error = socreate(family, &so, type, protocol, td->td_ucred, td);
  249         if (error) {
  250            fdclose(fdp, fp, fd, td);
  251            fdrop(fp, td);
  252            return error;
  253         }
  254 
  255         finit(fp, FREAD | FWRITE, DTYPE_SOCKET, so, &svr4_netops);
  256 
  257         /*
  258          * Allocate a stream structure and attach it to this socket.
  259          * We don't bother locking so_emuldata for SVR4 stream sockets as
  260          * its value is constant for the lifetime of the stream once it
  261          * is initialized here.
  262          */
  263         st = malloc(sizeof(struct svr4_strm), M_TEMP, M_WAITOK);
  264         st->s_family = so->so_proto->pr_domain->dom_family;
  265         st->s_cmd = ~0;
  266         st->s_afd = -1;
  267         st->s_eventmask = 0;
  268         so->so_emuldata = st;
  269 
  270         fdrop(fp, td);
  271         td->td_dupfd = fd;
  272         return ENXIO;
  273 }
  274 
  275 static int
  276 svr4_ptm_alloc(td)
  277         struct thread *td;
  278 {
  279         /*
  280          * XXX this is very, very ugly.  But I can't find a better
  281          * way that won't duplicate a big amount of code from
  282          * sys_open().  Ho hum...
  283          *
  284          * Fortunately for us, Solaris (at least 2.5.1) makes the
  285          * /dev/ptmx open automatically just open a pty, that (after
  286          * STREAMS I_PUSHes), is just a plain pty.  fstat() is used
  287          * to get the minor device number to map to a tty.
  288          * 
  289          * Cycle through the names. If sys_open() returns ENOENT (or
  290          * ENXIO), short circuit the cycle and exit.
  291          *
  292          * XXX: Maybe this can now be implemented by posix_openpt()?
  293          */
  294         static char ptyname[] = "/dev/ptyXX";
  295         static char ttyletters[] = "pqrstuwxyzPQRST";
  296         static char ttynumbers[] = "0123456789abcdef";
  297         struct proc *p;
  298         register_t fd;
  299         int error, l, n;
  300 
  301         fd = -1;
  302         n = 0;
  303         l = 0;
  304         p = td->td_proc;
  305         while (fd == -1) {
  306                 ptyname[8] = ttyletters[l];
  307                 ptyname[9] = ttynumbers[n];
  308 
  309                 error = kern_open(td, ptyname, UIO_SYSSPACE, O_RDWR, 0);
  310                 switch (error) {
  311                 case ENOENT:
  312                 case ENXIO:
  313                         return error;
  314                 case 0:
  315                         td->td_dupfd = td->td_retval[0];
  316                         return ENXIO;
  317                 default:
  318                         if (ttynumbers[++n] == '\0') {
  319                                 if (ttyletters[++l] == '\0')
  320                                         break;
  321                                 n = 0;
  322                         }
  323                 }
  324         }
  325         return ENOENT;
  326 }
  327 
  328 
  329 struct svr4_strm *
  330 svr4_stream_get(fp)
  331         struct file *fp;
  332 {
  333         struct socket *so;
  334 
  335         if (fp == NULL || fp->f_type != DTYPE_SOCKET)
  336                 return NULL;
  337 
  338         so = fp->f_data;
  339         return so->so_emuldata;
  340 }
  341 
  342 static int
  343 svr4_soo_close(struct file *fp, struct thread *td)
  344 {
  345         struct socket *so = fp->f_data;
  346         
  347         /*      CHECKUNIT_DIAG(ENXIO);*/
  348 
  349         svr4_delete_socket(td->td_proc, fp);
  350         free(so->so_emuldata, M_TEMP);
  351         return soo_close(fp, td);
  352 }
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FreeBSD/Linux Kernel Cross Reference sys/dev/streams/streams.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/streams/streams.c
