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FreeBSD/Linux Kernel Cross Reference
sys/netncp/ncp_subr.c

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    1 /*-
    2  * Copyright (c) 1999, 2000, 2001 Boris Popov
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *    This product includes software developed by Boris Popov.
   16  * 4. Neither the name of the author nor the names of any co-contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  */
   32 
   33 #include <sys/cdefs.h>
   34 __FBSDID("$FreeBSD$");
   35 
   36 #include <sys/param.h>
   37 #include <sys/systm.h>
   38 #include <sys/errno.h>
   39 #include <sys/eventhandler.h>
   40 #include <sys/kernel.h>
   41 #include <sys/lock.h>
   42 #include <sys/malloc.h>
   43 #include <sys/proc.h>
   44 #include <sys/sysctl.h>
   45 #include <sys/time.h>
   46 
   47 #include <netncp/ncp.h>
   48 #include <netncp/ncp_conn.h>
   49 #include <netncp/ncp_sock.h>
   50 #include <netncp/ncp_subr.h>
   51 #include <netncp/ncp_rq.h>
   52 #include <netncp/ncp_ncp.h>
   53 #include <netncp/nwerror.h>
   54 
   55 int ncp_debuglevel = 0;
   56 
   57 struct callout_handle ncp_timer_handle;
   58 static eventhandler_tag ncp_exit_tag;
   59 
   60 static void ncp_at_exit(void *arg, struct proc *p);
   61 static void ncp_timer(void *arg);
   62 
   63 /*
   64  * duplicate string from user space. It should be very-very slow.
   65  */
   66 char *
   67 ncp_str_dup(char *s) {
   68         char *p, bt;
   69         int len = 0;
   70 
   71         for (p = s;;p++) {
   72                 if (copyin(p, &bt, 1)) return NULL;
   73                 len++;
   74                 if (bt == 0) break;
   75         }
   76         MALLOC(p, char*, len, M_NCPDATA, M_WAITOK);
   77         copyin(s, p, len);
   78         return p;
   79 }
   80 
   81 
   82 void
   83 ncp_at_exit(void *arg, struct proc *p)
   84 {
   85         struct ncp_conn *ncp, *nncp;
   86         struct thread *td;
   87 
   88         mtx_lock(&Giant);
   89         FOREACH_THREAD_IN_PROC(p, td) {
   90                 if (ncp_conn_putprochandles(td) == 0)
   91                         continue;
   92 
   93                 ncp_conn_locklist(LK_EXCLUSIVE, td);
   94                 for (ncp = SLIST_FIRST(&conn_list); ncp; ncp = nncp) {
   95                         nncp = SLIST_NEXT(ncp, nc_next);
   96                         if (ncp_conn_lock(ncp, td, td->td_ucred,
   97                                           NCPM_READ | NCPM_EXECUTE | NCPM_WRITE))
   98                                 continue;
   99                         if (ncp_conn_free(ncp) != 0)
  100                                 ncp_conn_unlock(ncp, td);
  101                 }
  102                 ncp_conn_unlocklist(td);
  103         }
  104         mtx_unlock(&Giant);
  105 }
  106 
  107 int
  108 ncp_init(void)
  109 {
  110         ncp_conn_init();
  111         ncp_exit_tag = EVENTHANDLER_REGISTER(process_exit, ncp_at_exit, NULL,
  112             EVENTHANDLER_PRI_ANY);
  113         ncp_timer_handle = timeout(ncp_timer, NULL, NCP_TIMER_TICK);
  114         return 0;
  115 }
  116 
  117 int
  118 ncp_done(void)
  119 {
  120         int error;
  121 
  122         error = ncp_conn_destroy();
  123         if (error)
  124                 return error;
  125         untimeout(ncp_timer, NULL, ncp_timer_handle);
  126         EVENTHANDLER_DEREGISTER(process_exit, ncp_exit_tag);
  127         return 0;
  128 }
  129 
  130 
  131 /* tick every second and check for watch dog packets and lost connections */
  132 static void
  133 ncp_timer(void *arg)
  134 {
  135         struct ncp_conn *conn;
  136 
  137         if(ncp_conn_locklist(LK_SHARED | LK_NOWAIT, NULL) == 0) {
  138                 SLIST_FOREACH(conn, &conn_list, nc_next)
  139                         ncp_check_conn(conn);
  140                 ncp_conn_unlocklist(NULL);
  141         }
  142         ncp_timer_handle = timeout(ncp_timer, NULL, NCP_TIMER_TICK);
  143 }

Cache object: 9a03387b67a7a48ca46101031ef65599


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