The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/kern/uipc_accf.c

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    1 /*
    2  * Copyright (c) 2000 Paycounter, Inc.
    3  * Author: Alfred Perlstein <alfred@paycounter.com>, <alfred@FreeBSD.org>
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25  * SUCH DAMAGE.
   26  *
   27  *      $FreeBSD: releng/5.1/sys/kern/uipc_accf.c 111119 2003-02-19 05:47:46Z imp $
   28  */
   29 
   30 #define ACCEPT_FILTER_MOD
   31 
   32 #include "opt_param.h"
   33 #include <sys/param.h>
   34 #include <sys/systm.h>
   35 #include <sys/domain.h>
   36 #include <sys/kernel.h>
   37 #include <sys/malloc.h>
   38 #include <sys/mbuf.h>
   39 #include <sys/protosw.h>
   40 #include <sys/sysctl.h>
   41 #include <sys/socket.h>
   42 #include <sys/socketvar.h>
   43 #include <sys/queue.h>
   44 
   45 static SLIST_HEAD(, accept_filter) accept_filtlsthd =
   46         SLIST_HEAD_INITIALIZER(&accept_filtlsthd);
   47 
   48 MALLOC_DEFINE(M_ACCF, "accf", "accept filter data");
   49 
   50 static int unloadable = 0;
   51 
   52 SYSCTL_DECL(_net_inet); /* XXX: some header should do this for me */
   53 SYSCTL_NODE(_net_inet, OID_AUTO, accf, CTLFLAG_RW, 0, "Accept filters");
   54 SYSCTL_INT(_net_inet_accf, OID_AUTO, unloadable, CTLFLAG_RW, &unloadable, 0,
   55         "Allow unload of accept filters (not recommended)");
   56 
   57 /*
   58  * must be passed a malloc'd structure so we don't explode if the kld
   59  * is unloaded, we leak the struct on deallocation to deal with this,
   60  * but if a filter is loaded with the same name as a leaked one we re-use
   61  * the entry.
   62  */
   63 int
   64 accept_filt_add(struct accept_filter *filt)
   65 {
   66         struct accept_filter *p;
   67 
   68         SLIST_FOREACH(p, &accept_filtlsthd, accf_next)
   69                 if (strcmp(p->accf_name, filt->accf_name) == 0)  {
   70                         if (p->accf_callback != NULL) {
   71                                 return (EEXIST);
   72                         } else {
   73                                 p->accf_callback = filt->accf_callback;
   74                                 FREE(filt, M_ACCF);
   75                                 return (0);
   76                         }
   77                 }
   78                                 
   79         if (p == NULL)
   80                 SLIST_INSERT_HEAD(&accept_filtlsthd, filt, accf_next);
   81         return (0);
   82 }
   83 
   84 int
   85 accept_filt_del(char *name)
   86 {
   87         struct accept_filter *p;
   88 
   89         p = accept_filt_get(name);
   90         if (p == NULL)
   91                 return (ENOENT);
   92 
   93         p->accf_callback = NULL;
   94         return (0);
   95 }
   96 
   97 struct accept_filter *
   98 accept_filt_get(char *name)
   99 {
  100         struct accept_filter *p;
  101 
  102         SLIST_FOREACH(p, &accept_filtlsthd, accf_next)
  103                 if (strcmp(p->accf_name, name) == 0)
  104                         return (p);
  105 
  106         return (NULL);
  107 }
  108 
  109 int
  110 accept_filt_generic_mod_event(module_t mod, int event, void *data)
  111 {
  112         struct accept_filter *p;
  113         struct accept_filter *accfp = (struct accept_filter *) data;
  114         int     s, error;
  115 
  116         switch (event) {
  117         case MOD_LOAD:
  118                 MALLOC(p, struct accept_filter *, sizeof(*p), M_ACCF, M_WAITOK);
  119                 bcopy(accfp, p, sizeof(*p));
  120                 s = splnet();
  121                 error = accept_filt_add(p);
  122                 splx(s);
  123                 break;
  124 
  125         case MOD_UNLOAD:
  126                 /*
  127                  * Do not support unloading yet. we don't keep track of refcounts
  128                  * and unloading an accept filter callback and then having it called
  129                  * is a bad thing.  A simple fix would be to track the refcount
  130                  * in the struct accept_filter.
  131                  */
  132                 if (unloadable != 0) {
  133                         s = splnet();
  134                         error = accept_filt_del(accfp->accf_name);
  135                         splx(s);
  136                 } else
  137                         error = EOPNOTSUPP;
  138                 break;
  139 
  140         case MOD_SHUTDOWN:
  141                 error = 0;
  142                 break;
  143 
  144         default:
  145                 error = EOPNOTSUPP;
  146                 break;
  147         }
  148 
  149         return (error);
  150 }

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