The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/dev/streams/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: releng/7.3/sys/dev/streams/streams.c 171744 2007-08-06 14:26:03Z rwatson $");
   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_ioctl = soo_ioctl,
   94         .fo_poll = soo_poll,
   95         .fo_kqfilter = soo_kqfilter,
   96         .fo_stat = soo_stat,
   97         .fo_close =  svr4_soo_close
   98 };
   99  
  100 static struct cdevsw streams_cdevsw = {
  101         .d_version =    D_VERSION,
  102         .d_open =       streamsopen,
  103         .d_name =       "streams",
  104 };
  105  
  106 struct streams_softc {
  107         struct isa_device *dev;
  108 } ;
  109 
  110 #define UNIT(dev) minor(dev)    /* assume one minor number per unit */
  111 
  112 typedef struct streams_softc *sc_p;
  113 
  114 static  int
  115 streams_modevent(module_t mod, int type, void *unused)
  116 {
  117         switch (type) {
  118         case MOD_LOAD:
  119                 dt_ptm = make_dev(&streams_cdevsw, dev_ptm, 0, 0, 0666,
  120                         "ptm");
  121                 dt_arp = make_dev(&streams_cdevsw, dev_arp, 0, 0, 0666,
  122                         "arp");
  123                 dt_icmp = make_dev(&streams_cdevsw, dev_icmp, 0, 0, 0666,
  124                         "icmp");
  125                 dt_ip = make_dev(&streams_cdevsw, dev_ip, 0, 0, 0666,
  126                         "ip");
  127                 dt_tcp = make_dev(&streams_cdevsw, dev_tcp, 0, 0, 0666,
  128                         "tcp");
  129                 dt_udp = make_dev(&streams_cdevsw, dev_udp, 0, 0, 0666,
  130                         "udp");
  131                 dt_rawip = make_dev(&streams_cdevsw, dev_rawip, 0, 0, 0666,
  132                         "rawip");
  133                 dt_unix_dgram = make_dev(&streams_cdevsw, dev_unix_dgram,
  134                         0, 0, 0666, "ticlts");
  135                 dt_unix_stream = make_dev(&streams_cdevsw, dev_unix_stream,
  136                         0, 0, 0666, "ticots");
  137                 dt_unix_ord_stream = make_dev(&streams_cdevsw,
  138                         dev_unix_ord_stream, 0, 0, 0666, "ticotsord");
  139 
  140                 if (! (dt_ptm && dt_arp && dt_icmp && dt_ip && dt_tcp &&
  141                                 dt_udp && dt_rawip && dt_unix_dgram &&
  142                                 dt_unix_stream && dt_unix_ord_stream)) {
  143                         printf("WARNING: device config for STREAMS failed\n");
  144                         printf("Suggest unloading streams KLD\n");
  145                 }
  146                 return 0;
  147         case MOD_UNLOAD:
  148                 /* XXX should check to see if it's busy first */
  149                 destroy_dev(dt_ptm);
  150                 destroy_dev(dt_arp);
  151                 destroy_dev(dt_icmp);
  152                 destroy_dev(dt_ip);
  153                 destroy_dev(dt_tcp);
  154                 destroy_dev(dt_udp);
  155                 destroy_dev(dt_rawip);
  156                 destroy_dev(dt_unix_dgram);
  157                 destroy_dev(dt_unix_stream);
  158                 destroy_dev(dt_unix_ord_stream);
  159 
  160                 return 0;
  161         default:
  162                 return EOPNOTSUPP;
  163                 break;
  164         }
  165         return 0;
  166 }
  167 
  168 static moduledata_t streams_mod = {
  169         "streams",
  170         streams_modevent,
  171         0
  172 };
  173 DECLARE_MODULE(streams, streams_mod, SI_SUB_DRIVERS, SI_ORDER_ANY);
  174 MODULE_VERSION(streams, 1);
  175 
  176 /*
  177  * We only need open() and close() routines.  open() calls socreate()
  178  * to allocate a "real" object behind the stream and mallocs some state
  179  * info for use by the svr4 emulator;  close() deallocates the state
  180  * information and passes the underlying object to the normal socket close
  181  * routine.
  182  */
  183 static  int
  184 streamsopen(struct cdev *dev, int oflags, int devtype, struct thread *td)
  185 {
  186         struct filedesc *fdp;
  187         struct svr4_strm *st;
  188         struct socket *so;
  189         struct file *fp;
  190         int family, type, protocol;
  191         int error, fd;
  192         
  193         if (td->td_dupfd >= 0)
  194           return ENODEV;
  195 
  196         switch (minor(dev)) {
  197         case dev_udp:
  198           family = AF_INET;
  199           type = SOCK_DGRAM;
  200           protocol = IPPROTO_UDP;
  201           break;
  202 
  203         case dev_tcp:
  204           family = AF_INET;
  205           type = SOCK_STREAM;
  206           protocol = IPPROTO_TCP;
  207           break;
  208 
  209         case dev_ip:
  210         case dev_rawip:
  211           family = AF_INET;
  212           type = SOCK_RAW;
  213           protocol = IPPROTO_IP;
  214           break;
  215 
  216         case dev_icmp:
  217           family = AF_INET;
  218           type = SOCK_RAW;
  219           protocol = IPPROTO_ICMP;
  220           break;
  221 
  222         case dev_unix_dgram:
  223           family = AF_LOCAL;
  224           type = SOCK_DGRAM;
  225           protocol = 0;
  226           break;
  227 
  228         case dev_unix_stream:
  229         case dev_unix_ord_stream:
  230           family = AF_LOCAL;
  231           type = SOCK_STREAM;
  232           protocol = 0;
  233           break;
  234 
  235         case dev_ptm:
  236           return svr4_ptm_alloc(td);
  237 
  238         default:
  239           return EOPNOTSUPP;
  240         }
  241 
  242         fdp = td->td_proc->p_fd;
  243         if ((error = falloc(td, &fp, &fd)) != 0)
  244           return error;
  245         /* An extra reference on `fp' has been held for us by falloc(). */
  246 
  247         error = socreate(family, &so, type, protocol, td->td_ucred, td);
  248         if (error) {
  249            fdclose(fdp, fp, fd, td);
  250            fdrop(fp, td);
  251            return error;
  252         }
  253 
  254         FILE_LOCK(fp);
  255         fp->f_data = so;
  256         fp->f_flag = FREAD|FWRITE;
  257         fp->f_ops = &svr4_netops;
  258         fp->f_type = DTYPE_SOCKET;
  259         FILE_UNLOCK(fp);
  260 
  261         /*
  262          * Allocate a stream structure and attach it to this socket.
  263          * We don't bother locking so_emuldata for SVR4 stream sockets as
  264          * its value is constant for the lifetime of the stream once it
  265          * is initialized here.
  266          */
  267         st = malloc(sizeof(struct svr4_strm), M_TEMP, M_WAITOK);
  268         st->s_family = so->so_proto->pr_domain->dom_family;
  269         st->s_cmd = ~0;
  270         st->s_afd = -1;
  271         st->s_eventmask = 0;
  272         so->so_emuldata = st;
  273 
  274         fdrop(fp, td);
  275         td->td_dupfd = fd;
  276         return ENXIO;
  277 }
  278 
  279 static int
  280 svr4_ptm_alloc(td)
  281         struct thread *td;
  282 {
  283         /*
  284          * XXX this is very, very ugly.  But I can't find a better
  285          * way that won't duplicate a big amount of code from
  286          * sys_open().  Ho hum...
  287          *
  288          * Fortunately for us, Solaris (at least 2.5.1) makes the
  289          * /dev/ptmx open automatically just open a pty, that (after
  290          * STREAMS I_PUSHes), is just a plain pty.  fstat() is used
  291          * to get the minor device number to map to a tty.
  292          * 
  293          * Cycle through the names. If sys_open() returns ENOENT (or
  294          * ENXIO), short circuit the cycle and exit.
  295          */
  296         static char ptyname[] = "/dev/ptyXX";
  297         static char ttyletters[] = "pqrstuwxyzPQRST";
  298         static char ttynumbers[] = "0123456789abcdef";
  299         struct proc *p;
  300         register_t fd;
  301         int error, l, n;
  302 
  303         fd = -1;
  304         n = 0;
  305         l = 0;
  306         p = td->td_proc;
  307         while (fd == -1) {
  308                 ptyname[8] = ttyletters[l];
  309                 ptyname[9] = ttynumbers[n];
  310 
  311                 error = kern_open(td, ptyname, UIO_SYSSPACE, O_RDWR, 0);
  312                 switch (error) {
  313                 case ENOENT:
  314                 case ENXIO:
  315                         return error;
  316                 case 0:
  317                         td->td_dupfd = td->td_retval[0];
  318                         return ENXIO;
  319                 default:
  320                         if (ttynumbers[++n] == '\0') {
  321                                 if (ttyletters[++l] == '\0')
  322                                         break;
  323                                 n = 0;
  324                         }
  325                 }
  326         }
  327         return ENOENT;
  328 }
  329 
  330 
  331 struct svr4_strm *
  332 svr4_stream_get(fp)
  333         struct file *fp;
  334 {
  335         struct socket *so;
  336 
  337         if (fp == NULL || fp->f_type != DTYPE_SOCKET)
  338                 return NULL;
  339 
  340         so = fp->f_data;
  341         return so->so_emuldata;
  342 }
  343 
  344 static int
  345 svr4_soo_close(struct file *fp, struct thread *td)
  346 {
  347         struct socket *so = fp->f_data;
  348         
  349         /*      CHECKUNIT_DIAG(ENXIO);*/
  350 
  351         svr4_delete_socket(td->td_proc, fp);
  352         free(so->so_emuldata, M_TEMP);
  353         return soo_close(fp, td);
  354 }

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