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/11.2/sys/dev/streams/streams.c 298519 2016-04-23 20:29:55Z dchagin $");
   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 
   92 static struct cdevsw streams_cdevsw = {
   93         .d_version =    D_VERSION,
   94         .d_open =       streamsopen,
   95         .d_name =       "streams",
   96 };
   97  
   98 struct streams_softc {
   99         struct isa_device *dev;
  100 } ;
  101 
  102 #define UNIT(dev) dev2unit(dev) /* assume one minor number per unit */
  103 
  104 typedef struct streams_softc *sc_p;
  105 
  106 static  int
  107 streams_modevent(module_t mod, int type, void *unused)
  108 {
  109         switch (type) {
  110         case MOD_LOAD:
  111                 dt_ptm = make_dev(&streams_cdevsw, dev_ptm, 0, 0, 0666,
  112                         "ptm");
  113                 dt_arp = make_dev(&streams_cdevsw, dev_arp, 0, 0, 0666,
  114                         "arp");
  115                 dt_icmp = make_dev(&streams_cdevsw, dev_icmp, 0, 0, 0666,
  116                         "icmp");
  117                 dt_ip = make_dev(&streams_cdevsw, dev_ip, 0, 0, 0666,
  118                         "ip");
  119                 dt_tcp = make_dev(&streams_cdevsw, dev_tcp, 0, 0, 0666,
  120                         "tcp");
  121                 dt_udp = make_dev(&streams_cdevsw, dev_udp, 0, 0, 0666,
  122                         "udp");
  123                 dt_rawip = make_dev(&streams_cdevsw, dev_rawip, 0, 0, 0666,
  124                         "rawip");
  125                 dt_unix_dgram = make_dev(&streams_cdevsw, dev_unix_dgram,
  126                         0, 0, 0666, "ticlts");
  127                 dt_unix_stream = make_dev(&streams_cdevsw, dev_unix_stream,
  128                         0, 0, 0666, "ticots");
  129                 dt_unix_ord_stream = make_dev(&streams_cdevsw,
  130                         dev_unix_ord_stream, 0, 0, 0666, "ticotsord");
  131 
  132                 if (! (dt_ptm && dt_arp && dt_icmp && dt_ip && dt_tcp &&
  133                                 dt_udp && dt_rawip && dt_unix_dgram &&
  134                                 dt_unix_stream && dt_unix_ord_stream)) {
  135                         printf("WARNING: device config for STREAMS failed\n");
  136                         printf("Suggest unloading streams KLD\n");
  137                 }
  138 
  139                 /* Inherit generic socket file operations, except close(2). */
  140                 bcopy(&socketops, &svr4_netops, sizeof(struct fileops));
  141                 svr4_netops.fo_close = svr4_soo_close;
  142 
  143                 return 0;
  144         case MOD_UNLOAD:
  145                 /* XXX should check to see if it's busy first */
  146                 destroy_dev(dt_ptm);
  147                 destroy_dev(dt_arp);
  148                 destroy_dev(dt_icmp);
  149                 destroy_dev(dt_ip);
  150                 destroy_dev(dt_tcp);
  151                 destroy_dev(dt_udp);
  152                 destroy_dev(dt_rawip);
  153                 destroy_dev(dt_unix_dgram);
  154                 destroy_dev(dt_unix_stream);
  155                 destroy_dev(dt_unix_ord_stream);
  156 
  157                 return 0;
  158         default:
  159                 return EOPNOTSUPP;
  160                 break;
  161         }
  162         return 0;
  163 }
  164 
  165 static moduledata_t streams_mod = {
  166         "streams",
  167         streams_modevent,
  168         0
  169 };
  170 DECLARE_MODULE(streams, streams_mod, SI_SUB_DRIVERS, SI_ORDER_ANY);
  171 MODULE_VERSION(streams, 1);
  172 MODULE_DEPEND(streams, svr4elf, 1, 1, 1);
  173 
  174 /*
  175  * We only need open() and close() routines.  open() calls socreate()
  176  * to allocate a "real" object behind the stream and mallocs some state
  177  * info for use by the svr4 emulator;  close() deallocates the state
  178  * information and passes the underlying object to the normal socket close
  179  * routine.
  180  */
  181 static  int
  182 streamsopen(struct cdev *dev, int oflags, int devtype, struct thread *td)
  183 {
  184         struct svr4_strm *st;
  185         struct socket *so;
  186         struct file *fp;
  187         int family, type, protocol;
  188         int error, fd;
  189         
  190         if (td->td_dupfd >= 0)
  191           return ENODEV;
  192 
  193         switch (dev2unit(dev)) {
  194         case dev_udp:
  195           family = AF_INET;
  196           type = SOCK_DGRAM;
  197           protocol = IPPROTO_UDP;
  198           break;
  199 
  200         case dev_tcp:
  201           family = AF_INET;
  202           type = SOCK_STREAM;
  203           protocol = IPPROTO_TCP;
  204           break;
  205 
  206         case dev_ip:
  207         case dev_rawip:
  208           family = AF_INET;
  209           type = SOCK_RAW;
  210           protocol = IPPROTO_IP;
  211           break;
  212 
  213         case dev_icmp:
  214           family = AF_INET;
  215           type = SOCK_RAW;
  216           protocol = IPPROTO_ICMP;
  217           break;
  218 
  219         case dev_unix_dgram:
  220           family = AF_LOCAL;
  221           type = SOCK_DGRAM;
  222           protocol = 0;
  223           break;
  224 
  225         case dev_unix_stream:
  226         case dev_unix_ord_stream:
  227           family = AF_LOCAL;
  228           type = SOCK_STREAM;
  229           protocol = 0;
  230           break;
  231 
  232         case dev_ptm:
  233           return svr4_ptm_alloc(td);
  234 
  235         default:
  236           return EOPNOTSUPP;
  237         }
  238 
  239         if ((error = falloc(td, &fp, &fd, 0)) != 0)
  240           return error;
  241         /* An extra reference on `fp' has been held for us by falloc(). */
  242 
  243         error = socreate(family, &so, type, protocol, td->td_ucred, td);
  244         if (error) {
  245            fdclose(td, fp, fd);
  246            fdrop(fp, td);
  247            return error;
  248         }
  249 
  250         finit(fp, FREAD | FWRITE, DTYPE_SOCKET, so, &svr4_netops);
  251 
  252         /*
  253          * Allocate a stream structure and attach it to this socket.
  254          * We don't bother locking so_emuldata for SVR4 stream sockets as
  255          * its value is constant for the lifetime of the stream once it
  256          * is initialized here.
  257          */
  258         st = malloc(sizeof(struct svr4_strm), M_TEMP, M_WAITOK);
  259         st->s_family = so->so_proto->pr_domain->dom_family;
  260         st->s_cmd = ~0;
  261         st->s_afd = -1;
  262         st->s_eventmask = 0;
  263         so->so_emuldata = st;
  264 
  265         fdrop(fp, td);
  266         td->td_dupfd = fd;
  267         return ENXIO;
  268 }
  269 
  270 static int
  271 svr4_ptm_alloc(td)
  272         struct thread *td;
  273 {
  274         /*
  275          * XXX this is very, very ugly.  But I can't find a better
  276          * way that won't duplicate a big amount of code from
  277          * sys_open().  Ho hum...
  278          *
  279          * Fortunately for us, Solaris (at least 2.5.1) makes the
  280          * /dev/ptmx open automatically just open a pty, that (after
  281          * STREAMS I_PUSHes), is just a plain pty.  fstat() is used
  282          * to get the minor device number to map to a tty.
  283          * 
  284          * Cycle through the names. If sys_open() returns ENOENT (or
  285          * ENXIO), short circuit the cycle and exit.
  286          *
  287          * XXX: Maybe this can now be implemented by posix_openpt()?
  288          */
  289         static char ptyname[] = "/dev/ptyXX";
  290         static char ttyletters[] = "pqrstuwxyzPQRST";
  291         static char ttynumbers[] = "0123456789abcdef";
  292         struct proc *p;
  293         register_t fd;
  294         int error, l, n;
  295 
  296         fd = -1;
  297         n = 0;
  298         l = 0;
  299         p = td->td_proc;
  300         while (fd == -1) {
  301                 ptyname[8] = ttyletters[l];
  302                 ptyname[9] = ttynumbers[n];
  303 
  304                 error = kern_openat(td, AT_FDCWD, ptyname, UIO_SYSSPACE,
  305                     O_RDWR, 0);
  306                 switch (error) {
  307                 case ENOENT:
  308                 case ENXIO:
  309                         return error;
  310                 case 0:
  311                         td->td_dupfd = td->td_retval[0];
  312                         return ENXIO;
  313                 default:
  314                         if (ttynumbers[++n] == '\0') {
  315                                 if (ttyletters[++l] == '\0')
  316                                         break;
  317                                 n = 0;
  318                         }
  319                 }
  320         }
  321         return ENOENT;
  322 }
  323 
  324 
  325 static int
  326 svr4_soo_close(struct file *fp, struct thread *td)
  327 {
  328         struct socket *so = fp->f_data;
  329         
  330         /*      CHECKUNIT_DIAG(ENXIO);*/
  331 
  332         svr4_delete_socket(td->td_proc, fp);
  333         free(so->so_emuldata, M_TEMP);
  334 
  335         fp->f_ops = &badfileops;
  336         fp->f_data = NULL;
  337 
  338         return soclose(so);
  339 }
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FreeBSD/Linux Kernel Cross Reference sys/dev/streams/streams.c

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