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/net80211/ieee80211_alq.c

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    1 /*-
    2  * Copyright (c) 2011 Adrian Chadd, Xenion Lty Ltd
    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  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   17  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   24  */
   25 
   26 #include <sys/cdefs.h>
   27 #ifdef __FreeBSD__
   28 __FBSDID("$FreeBSD: releng/11.0/sys/net80211/ieee80211_alq.c 257284 2013-10-28 22:26:03Z glebius $");
   29 #endif
   30 
   31 /*
   32  * net80211 fast-logging support, primarily for debugging.
   33  *
   34  * This implements a single debugging queue which includes
   35  * per-device enumeration where needed.
   36  */
   37 
   38 #include "opt_wlan.h"
   39 
   40 #include <sys/param.h>
   41 #include <sys/systm.h>
   42 #include <sys/mbuf.h>
   43 #include <sys/malloc.h>
   44 #include <sys/endian.h>
   45 #include <sys/kernel.h>
   46 #include <sys/sysctl.h>
   47 #include <sys/pcpu.h>
   48 #include <sys/proc.h>
   49 #include <sys/ucred.h>
   50 #include <sys/alq.h>
   51 
   52 #include <sys/socket.h>
   53 
   54 #include <net/if.h>
   55 #include <net/if_var.h>
   56 #include <net/if_media.h>
   57 #include <net/ethernet.h>
   58 
   59 #include <net80211/ieee80211_var.h>
   60 #include <net80211/ieee80211_freebsd.h>
   61 #include <net80211/ieee80211_alq.h>
   62 
   63 static struct alq *ieee80211_alq;
   64 static int ieee80211_alq_lost;
   65 static int ieee80211_alq_logged;
   66 static char ieee80211_alq_logfile[MAXPATHLEN] = "/tmp/net80211.log";
   67 static unsigned int ieee80211_alq_qsize = 64*1024;
   68 
   69 static int
   70 ieee80211_alq_setlogging(int enable)
   71 {
   72         int error;
   73 
   74         if (enable) {
   75                 if (ieee80211_alq)
   76                         alq_close(ieee80211_alq);
   77 
   78                 error = alq_open(&ieee80211_alq,
   79                     ieee80211_alq_logfile,
   80                     curthread->td_ucred,
   81                     ALQ_DEFAULT_CMODE,
   82                     sizeof (struct ieee80211_alq_rec),
   83                     ieee80211_alq_qsize);
   84                 ieee80211_alq_lost = 0;
   85                 ieee80211_alq_logged = 0;
   86                 printf("net80211: logging to %s enabled; "
   87                     "struct size %d bytes\n",
   88                     ieee80211_alq_logfile,
   89                     sizeof(struct ieee80211_alq_rec));
   90         } else {
   91                 if (ieee80211_alq)
   92                         alq_close(ieee80211_alq);
   93                 ieee80211_alq = NULL;
   94                 printf("net80211: logging disabled\n");
   95                 error = 0;
   96         }
   97         return (error);
   98 }
   99 
  100 static int
  101 sysctl_ieee80211_alq_log(SYSCTL_HANDLER_ARGS)
  102 {
  103         int error, enable;
  104 
  105         enable = (ieee80211_alq != NULL);
  106         error = sysctl_handle_int(oidp, &enable, 0, req);
  107         if (error || !req->newptr)
  108                 return (error);
  109         else
  110                 return (ieee80211_alq_setlogging(enable));
  111 }
  112 
  113 SYSCTL_PROC(_net_wlan, OID_AUTO, alq, CTLTYPE_INT|CTLFLAG_RW,
  114         0, 0, sysctl_ieee80211_alq_log, "I", "Enable net80211 alq logging");
  115 SYSCTL_INT(_net_wlan, OID_AUTO, alq_size, CTLFLAG_RW,
  116         &ieee80211_alq_qsize, 0, "In-memory log size (#records)");
  117 SYSCTL_INT(_net_wlan, OID_AUTO, alq_lost, CTLFLAG_RW,
  118         &ieee80211_alq_lost, 0, "Debugging operations not logged");
  119 SYSCTL_INT(_net_wlan, OID_AUTO, alq_logged, CTLFLAG_RW,
  120         &ieee80211_alq_logged, 0, "Debugging operations logged");
  121 
  122 static struct ale *
  123 ieee80211_alq_get(void)
  124 {
  125         struct ale *ale;
  126 
  127         ale = alq_get(ieee80211_alq, ALQ_NOWAIT);
  128         if (!ale)
  129                 ieee80211_alq_lost++;
  130         else
  131                 ieee80211_alq_logged++;
  132         return ale;
  133 }
  134 
  135 void
  136 ieee80211_alq_log(struct ieee80211vap *vap, uint8_t op, u_char *p, int l)
  137 {
  138         struct ale *ale;
  139         struct ieee80211_alq_rec *r;
  140 
  141         if (ieee80211_alq == NULL)
  142                 return;
  143 
  144         ale = ieee80211_alq_get();
  145         if (! ale)
  146                 return;
  147 
  148         r = (struct ieee80211_alq_rec *) ale->ae_data;
  149         r->r_timestamp = htonl(ticks);
  150         r->r_version = 1;
  151         r->r_wlan = htons(vap->iv_ifp->if_dunit);
  152         r->r_op = op;
  153         r->r_threadid = htonl((uint32_t) curthread->td_tid);
  154         memcpy(&r->r_payload, p, MIN(l, sizeof(r->r_payload)));
  155         alq_post(ieee80211_alq, ale);
  156 }

Cache object: b553d4ae1ff903033badf1248ab26e8e


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