The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netgraph/ng_device.c

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    1 /*
    2  * Copyright (c) 2002 Mark Santcroos <marks@ripe.net>
    3  *
    4  * Redistribution and use in source and binary forms, with or without
    5  * modification, are permitted provided that the following conditions
    6  * are met:
    7  * 1. Redistributions of source code must retain the above copyright
    8  *    notice, this list of conditions and the following disclaimer.
    9  * 2. Redistributions in binary form must reproduce the above copyright
   10  *    notice, this list of conditions and the following disclaimer in the
   11  *    documentation and/or other materials provided with the distribution.
   12  * 3. The name of the author may not be used to endorse or promote products
   13  *    derived from this software without specific prior written permission.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   25  *
   26  * Netgraph "device" node
   27  *
   28  * This node presents a /dev/ngd%d device that interfaces to an other 
   29  * netgraph node.
   30  *
   31  * $FreeBSD: src/sys/netgraph/ng_device.c,v 1.1.2.1 2002/08/23 07:15:44 julian Exp $
   32  *
   33  */
   34 
   35 #include <sys/param.h>
   36 #include <sys/systm.h>
   37 #include <sys/kernel.h>
   38 #include <sys/mbuf.h>
   39 #include <sys/uio.h>
   40 #include <sys/queue.h>
   41 #include <sys/malloc.h>
   42 #include <sys/conf.h>
   43 #include <sys/poll.h>
   44 
   45 #include <netgraph/ng_message.h>
   46 #include <netgraph/netgraph.h>
   47 
   48 #include "ng_device.h"
   49 
   50 /* turn this on for verbose messages */
   51 #define NGD_DEBUG
   52 
   53 /* Netgraph methods */
   54 static ng_constructor_t ng_device_cons;
   55 static ng_rcvmsg_t      ng_device_rcvmsg;
   56 static ng_newhook_t     ng_device_newhook;
   57 static ng_connect_t     ng_device_connect;
   58 static ng_rcvdata_t     ng_device_rcvdata;
   59 static ng_disconnect_t  ng_device_disconnect;
   60 static int              ng_device_mod_event(module_t mod, int event, void *data);
   61 
   62 static int ng_device_init(void);
   63 static int get_free_unit(void);
   64 
   65 /* Netgraph type */
   66 static struct ng_type typestruct = {
   67         NG_VERSION,                     /* version */
   68         NG_DEVICE_NODE_TYPE,            /* name */
   69         ng_device_mod_event,            /* modevent */
   70         ng_device_cons,                 /* constructor */
   71         ng_device_rcvmsg,               /* receive msg */
   72         NULL,                           /* shutdown */
   73         ng_device_newhook,              /* newhook */
   74         NULL,                           /* findhook */
   75         ng_device_connect,              /* connect */
   76         ng_device_rcvdata,              /* receive data */
   77         ng_device_rcvdata,              /* receive queued data */
   78         ng_device_disconnect,           /* disconnect */
   79         NULL
   80 };
   81 NETGRAPH_INIT(device, &typestruct);
   82 
   83 /* per hook data */
   84 struct ngd_connection {
   85         SLIST_ENTRY(ngd_connection) links;
   86 
   87         cdev_t  ngddev;
   88         struct  ng_hook *active_hook;
   89         char    *readq;
   90         int     loc;
   91         int     unit;
   92 };
   93 
   94 /* global data */
   95 struct ngd_softc {
   96         SLIST_HEAD(, ngd_connection) head;
   97 
   98         node_p node;
   99         char nodename[NG_NODESIZ];
  100 } ngd_softc;
  101 
  102 /* helper definition */
  103 #define         MIN(a, b)       ((a) < (b) ? (a) : (b))
  104 
  105 /* the per connection receiving queue maximum */
  106 #define NGD_QUEUE_SIZE (1024*10)
  107 
  108 /* Maximum number of NGD devices */
  109 #define MAX_NGD 25              /* should be more than enough for now */
  110 
  111 static d_close_t ngdclose;
  112 static d_open_t ngdopen;
  113 static d_read_t ngdread;
  114 static d_write_t ngdwrite;
  115 static d_ioctl_t ngdioctl;
  116 static d_poll_t ngdpoll;
  117 
  118 #define NGD_CDEV_MAJOR 20
  119 static struct cdevsw ngd_cdevsw = {
  120         /* name */      "ngd",
  121         /* maj */       NGD_CDEV_MAJOR,
  122         /* flags */     0,
  123         /* port */      NULL,
  124         /* clone */     NULL,
  125 
  126         /* open */      ngdopen,
  127         /* close */     ngdclose,
  128         /* read */      ngdread,
  129         /* write */     ngdwrite,
  130         /* ioctl */     ngdioctl,
  131         /* poll */      ngdpoll,
  132         /* mmap */      nommap,
  133         /* strategy */  nostrategy,
  134         /* dump */      nodump,
  135         /* psize */     nopsize
  136 };
  137 
  138 /* 
  139  * this holds all the stuff that should be done at load time 
  140  */
  141 static int
  142 ng_device_mod_event(module_t mod, int event, void *data)
  143 {
  144         int error = 0;
  145 
  146 #ifdef NGD_DEBUG
  147         kprintf("%s()\n", __func__);
  148 #endif /* NGD_DEBUG */
  149 
  150         switch (event) {
  151                 case MOD_LOAD:
  152                         cdevsw_add(&ngd_cdevsw, 0, 0);
  153                         ng_device_init();
  154                         break;
  155 
  156                 case MOD_UNLOAD:
  157                         /* XXX do we need to do something specific ? */
  158                         /* ng_device_breakdown */
  159                         cdevsw_remove(&ngd_cdevsw, 0, 0);
  160                         error = EBUSY; /* no unload! */
  161                         break;
  162 
  163                 
  164                 default:
  165                         error = EOPNOTSUPP;
  166                         break;
  167         }
  168 
  169         return(error);
  170 }
  171 
  172 
  173 static int
  174 ng_device_init(void)
  175 {
  176         struct ngd_softc *sc = &ngd_softc;
  177         
  178 #ifdef NGD_DEBUG
  179         kprintf("%s()\n", __func__);
  180 #endif /* NGD_DEBUG */ 
  181 
  182         SLIST_INIT(&sc->head);
  183 
  184         if (ng_make_node_common(&typestruct, &sc->node) != 0) {
  185                 kprintf("%s(): ng_make_node_common failed\n", __func__);
  186                 return(ENXIO);
  187         }
  188         ksprintf(sc->nodename, "%s", NG_DEVICE_NODE_TYPE);
  189         if (ng_name_node(sc->node, sc->nodename)) {
  190                 NG_NODE_UNREF(sc->node); /* make it go away again */
  191                 kprintf("%s(): ng_name_node failed\n", __func__);
  192                 return(ENXIO);
  193         }
  194         NG_NODE_SET_PRIVATE(sc->node, sc);
  195 
  196         return(0);
  197 }
  198 
  199 /* 
  200  * don't allow to be created, only the device can do that 
  201  */
  202 static int
  203 ng_device_cons(node_p node)
  204 {
  205 
  206 #ifdef NGD_DEBUG
  207         kprintf("%s()\n", __func__);
  208 #endif /* NGD_DEBUG */
  209         
  210         return(EINVAL);
  211 }
  212 
  213 /*
  214  * Receive control message. We just  free it.
  215  */
  216 static int
  217 ng_device_rcvmsg(node_p node, 
  218         struct ng_mesg *msg, const char *retaddr, struct ng_mesg **rptr)
  219 {
  220         kfree(msg, M_NETGRAPH);
  221         return(ENOTTY);
  222 }
  223 
  224 static int
  225 get_free_unit(void)
  226 {
  227         struct ngd_connection *tmp = NULL;
  228         struct ngd_softc *sc = &ngd_softc;
  229         int n = 0;
  230         int unit = -1;
  231 
  232 #ifdef NGD_DEBUG
  233         kprintf("%s()\n", __func__);
  234 #endif /* NGD_DEBUG */
  235 
  236         /* When there is no list yet, the first device unit is always 0. */
  237         if (SLIST_EMPTY(&sc->head)) {
  238                 unit = 0;
  239                 return(unit);
  240         }
  241 
  242         /* Just do a brute force loop to find the first free unit that is
  243          * smaller than MAX_NGD.
  244          * Set MAX_NGD to a large value, doesn't impact performance.
  245          */
  246         for(n = 0;n<MAX_NGD && unit == -1;n++) {
  247                 SLIST_FOREACH(tmp, &sc->head, links) {
  248 
  249                         if(tmp->unit == n) {
  250                                 unit = -1;
  251                                 break;
  252                         }
  253                         unit = n;
  254                 }
  255         }
  256 
  257         return(unit);
  258 }
  259 
  260 /*
  261  * incoming hook
  262  */
  263 static int
  264 ng_device_newhook(node_p node, hook_p hook, const char *name)
  265 {
  266         struct ngd_softc *sc = &ngd_softc;
  267         struct ngd_connection * new_connection = NULL;
  268 
  269 #ifdef NGD_DEBUG
  270         kprintf("%s()\n", __func__);
  271 #endif /* NGD_DEBUG */
  272 
  273         new_connection = kmalloc(sizeof(struct ngd_connection), M_DEVBUF, M_NOWAIT);
  274         if(new_connection == NULL) {
  275                 kprintf("%s(): ERROR: new_connection == NULL\n", __func__);
  276                 return(-1);
  277         }
  278 
  279         new_connection->unit = get_free_unit();
  280         if(new_connection->unit<0) {
  281                 kprintf("%s: No free unit found by get_free_unit(), "
  282                                 "increas MAX_NGD\n", __func__);
  283                 kfree(new_connection, M_DEVBUF);
  284                 return(-1);
  285         }
  286         new_connection->ngddev = make_dev(&ngd_cdevsw,
  287             new_connection->unit, 0, 0, 0600, "ngd%d", new_connection->unit);
  288         if(new_connection->ngddev == NULL) {
  289                 kprintf("%s(): make_dev failed\n", __func__);
  290                 SLIST_REMOVE(&sc->head, new_connection, ngd_connection, links);
  291                 kfree(new_connection, M_DEVBUF);
  292                 return(-1);
  293         }
  294 
  295         new_connection->readq =
  296             kmalloc(sizeof(char)*NGD_QUEUE_SIZE, M_DEVBUF, M_NOWAIT | M_ZERO);
  297         if(new_connection->readq == NULL) {
  298                 kprintf("%s(): readq malloc failed\n", __func__);
  299                 destroy_dev(new_connection->ngddev);
  300                 SLIST_REMOVE(&sc->head, new_connection, ngd_connection, links);
  301                 kfree(new_connection, M_DEVBUF);
  302                 return(-1);
  303         }
  304 
  305         /* point to begin of buffer */
  306         new_connection->loc = 0;
  307         new_connection->active_hook = hook;
  308 
  309         SLIST_INSERT_HEAD(&sc->head, new_connection, links);
  310 
  311         return(0);
  312 }
  313 
  314 /*
  315  * we gave ok to a new hook
  316  * now connect
  317  */
  318 static int
  319 ng_device_connect(hook_p hook)
  320 {
  321 
  322 #ifdef NGD_DEBUG
  323         kprintf("%s()\n", __func__);
  324 #endif /* NGD_DEBUG */
  325 
  326         return(0);
  327 }
  328 
  329 
  330 /*
  331  * Receive data from hook
  332  */
  333 static int
  334 ng_device_rcvdata(hook_p hook, struct mbuf *m, meta_p meta)
  335 {
  336         struct ngd_softc *sc = &ngd_softc;
  337         struct ngd_connection * connection = NULL;
  338         struct ngd_connection * tmp;
  339         char *buffer;
  340 
  341 #ifdef NGD_DEBUG
  342         kprintf("%s()\n", __func__);
  343 #endif /* NGD_DEBUG */
  344 
  345         SLIST_FOREACH(tmp, &sc->head, links) {
  346                 if(tmp->active_hook == hook) {
  347                         connection = tmp;
  348                 }
  349         }
  350         if(connection == NULL) {
  351                 kprintf("%s(): connection still NULL, no hook found\n", __func__);
  352                 return(-1);
  353         }
  354 
  355         NG_FREE_META(meta);
  356 
  357         m = m_pullup(m, m->m_len);
  358         if(m == NULL) {
  359                 kprintf("%s(): ERROR: m_pullup failed\n", __func__);
  360                 return(-1);
  361         }
  362 
  363         buffer = kmalloc(sizeof(char)*m->m_len, M_DEVBUF, M_NOWAIT | M_ZERO);
  364         if(buffer == NULL) {
  365                 kprintf("%s(): ERROR: buffer malloc failed\n", __func__);
  366                 return(-1);
  367         }
  368 
  369         buffer = mtod(m, char *);
  370 
  371         if( (connection->loc+m->m_len) < NGD_QUEUE_SIZE) {
  372                 memcpy(connection->readq+connection->loc, buffer, m->m_len);
  373                 connection->loc += m->m_len;
  374         } else
  375                 kprintf("%s(): queue full, first read out a bit\n", __func__);
  376 
  377         kfree(buffer, M_DEVBUF);
  378 
  379         return(0);
  380 }
  381 
  382 /*
  383  * Removal of the last link destroys the node
  384  */
  385 static int
  386 ng_device_disconnect(hook_p hook)
  387 {
  388         struct ngd_softc *sc = &ngd_softc;
  389         struct ngd_connection * connection = NULL;
  390         struct ngd_connection * tmp;
  391 
  392 #ifdef NGD_DEBUG
  393         kprintf("%s()\n", __func__);
  394 #endif /* NGD_DEBUG */
  395 
  396         SLIST_FOREACH(tmp, &sc->head, links) {
  397                 if(tmp->active_hook == hook) {
  398                         connection = tmp;
  399                 }
  400         }
  401         if(connection == NULL) {
  402                 kprintf("%s(): connection still NULL, no hook found\n",
  403                     __func__);
  404                 return(-1);
  405         }
  406 
  407         kfree(connection->readq, M_DEVBUF);
  408 
  409         destroy_dev(connection->ngddev);
  410 
  411         SLIST_REMOVE(&sc->head, connection, ngd_connection, links);
  412 
  413         return(0);
  414 }
  415 /*
  416  * the device is opened 
  417  */
  418 static int
  419 ngdopen(cdev_t dev, int flag, int mode, struct thread *td)
  420 {
  421 
  422 #ifdef NGD_DEBUG
  423         kprintf("%s()\n", __func__);
  424 #endif /* NGD_DEBUG */
  425 
  426         return(0);
  427 }
  428 
  429 /*
  430  * the device is closed 
  431  */
  432 static int
  433 ngdclose(cdev_t dev, int flag, int mode, struct thread *td)
  434 {
  435 
  436 #ifdef NGD_DEBUG
  437         kprintf("%s()\n", __func__);
  438 #endif
  439 
  440         return(0);
  441 }
  442 
  443 
  444 /*
  445  * process ioctl
  446  *
  447  * they are translated into netgraph messages and passed on
  448  * 
  449  */
  450 static int
  451 ngdioctl(cdev_t dev, u_long cmd, caddr_t addr, int flag, struct thread *td)
  452 {
  453         struct ngd_softc *sc = &ngd_softc;
  454         struct ngd_connection * connection = NULL;
  455         struct ngd_connection * tmp;
  456         int error = 0;
  457         struct ng_mesg *msg;
  458         struct ngd_param_s * datap;
  459 
  460 #ifdef NGD_DEBUG
  461         kprintf("%s()\n", __func__);
  462 #endif /* NGD_DEBUG */
  463 
  464         SLIST_FOREACH(tmp, &sc->head, links) {
  465                 if(tmp->ngddev == dev) {
  466                         connection = tmp;
  467                 }
  468         }
  469         if(connection == NULL) {
  470                 kprintf("%s(): connection still NULL, no dev found\n",
  471                     __func__);
  472                 return(-1);
  473         }
  474 
  475         /* NG_MKMESSAGE(msg, cookie, cmdid, len, how) */
  476         NG_MKMESSAGE(msg, NGM_DEVICE_COOKIE, cmd, sizeof(struct ngd_param_s), 
  477                         M_NOWAIT);
  478         if (msg == NULL) {
  479                 kprintf("%s(): msg == NULL\n", __func__);
  480                 goto nomsg;
  481         }
  482 
  483         /* pass the ioctl data into the ->data area */
  484         datap = (struct ngd_param_s *)msg->data;
  485         datap->p = addr;
  486 
  487         /*ng_send_msg(node_p here, struct ng_mesg *msg,
  488                     const char *address, struct ng_mesg **resp); */
  489         error = ng_send_msg(sc->node, msg,
  490             NG_HOOK_NAME(connection->active_hook), NULL);
  491         if(error)
  492                 kprintf("%s(): ng_send_msg() error: %d\n", __func__, error);
  493 
  494 nomsg:
  495 
  496         return(0);
  497 }
  498 
  499 
  500 /*
  501  * This function is called when a read(2) is done to our device.
  502  * We pass the data available in kernelspace on into userland using
  503  * uiomove.
  504  */
  505 static int
  506 ngdread(cdev_t dev, struct uio *uio, int flag)
  507 {
  508         int ret = 0, amnt;
  509         char buffer[uio->uio_resid+1];
  510         struct ngd_softc *sc = &ngd_softc;
  511         struct ngd_connection * connection = NULL;
  512         struct ngd_connection * tmp;
  513 
  514 #ifdef NGD_DEBUG
  515         kprintf("%s()\n", __func__);
  516 #endif /* NGD_DEBUG */
  517 
  518         SLIST_FOREACH(tmp, &sc->head, links) {
  519                 if(tmp->ngddev == dev) {
  520                         connection = tmp;
  521                 }
  522         }
  523         if(connection == NULL) {
  524                 kprintf("%s(): connection still NULL, no dev found\n", __func__);
  525                 return(-1);
  526         }
  527 
  528         while ( ( uio->uio_resid > 0 ) && ( connection->loc > 0 ) ) {
  529                 amnt = MIN(uio->uio_resid, connection->loc);
  530 
  531                 memcpy(buffer, connection->readq, amnt);
  532                 memcpy(connection->readq, connection->readq+amnt,
  533                                 connection->loc-amnt);
  534                 connection->loc -= amnt;
  535 
  536                 ret = uiomove((caddr_t)buffer, amnt, uio);
  537                 if(ret != 0)
  538                         goto error;
  539 
  540         }
  541         return(0);
  542 
  543 error:
  544         kprintf("%s(): uiomove returns error %d\n", __func__, ret);
  545         /* do error cleanup here */
  546         return(ret);
  547 }
  548 
  549 
  550 /* 
  551  * This function is called when our device is written to.
  552  * We read the data from userland into our local buffer and pass it on
  553  * into the remote hook.
  554  *
  555  */
  556 static int
  557 ngdwrite(cdev_t dev, struct uio *uio, int flag)
  558 {
  559         int ret;
  560         int error = 0;
  561         struct mbuf *m;
  562         char buffer[uio->uio_resid];
  563         int len = uio->uio_resid;
  564         struct ngd_softc *sc =& ngd_softc;
  565         struct ngd_connection * connection = NULL;
  566         struct ngd_connection * tmp;
  567 
  568 #ifdef NGD_DEBUG
  569         kprintf("%s()\n", __func__);
  570 #endif /* NGD_DEBUG */
  571 
  572         SLIST_FOREACH(tmp, &sc->head, links) {
  573                 if(tmp->ngddev == dev) {
  574                         connection = tmp;
  575                 }
  576         }
  577 
  578         if(connection == NULL) {
  579                 kprintf("%s(): connection still NULL, no dev found\n", __func__);
  580                 return(-1);
  581         }
  582 
  583         if (len > 0) {
  584                 if ((ret = uiomove((caddr_t)buffer, len, uio)) != 0)
  585                         goto error;
  586         } else
  587                 kprintf("%s(): len <= 0 : supposed to happen?!\n", __func__);
  588 
  589         m = m_devget(buffer, len, 0, NULL, NULL);
  590 
  591         NG_SEND_DATA_ONLY(error, connection->active_hook, m);
  592 
  593         return(0);
  594 
  595 error:
  596         /* do error cleanup here */
  597         kprintf("%s(): uiomove returned err: %d\n", __func__, ret);
  598 
  599         return(ret);
  600 }
  601 
  602 /*
  603  * we are being polled/selected
  604  * check if there is data available for read
  605  */
  606 static int
  607 ngdpoll(cdev_t dev, int events, struct thread *td)
  608 {
  609         int revents = 0;
  610         struct ngd_softc *sc = &ngd_softc;
  611         struct ngd_connection * connection = NULL;
  612         struct ngd_connection * tmp;
  613 
  614 
  615         if (events & (POLLIN | POLLRDNORM)) {
  616                 /* get the connection we have to know the loc from */
  617                 SLIST_FOREACH(tmp, &sc->head, links) {
  618                         if(tmp->ngddev == dev) {
  619                                 connection = tmp;
  620                         }
  621                 }
  622                 if(connection == NULL) {
  623                         kprintf("%s(): ERROR: connection still NULL, "
  624                                 "no dev found\n", __func__);
  625                         return(-1);
  626                 }
  627 
  628                 if (connection->loc > 0)
  629                         revents |= events & (POLLIN | POLLRDNORM);
  630         }
  631 
  632         return(revents);
  633 }

Cache object: 004ed929593d3bfb301b983edbab9ced


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