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  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2011 Adrian Chadd, Xenion Lty Ltd
    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  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   26  */
   27 
   28 #include <sys/cdefs.h>
   29 #ifdef __FreeBSD__
   30 __FBSDID("$FreeBSD$");
   31 #endif
   32 
   33 /*
   34  * net80211 fast-logging support, primarily for debugging.
   35  *
   36  * This implements a single debugging queue which includes
   37  * per-device enumeration where needed.
   38  */
   39 
   40 #include "opt_wlan.h"
   41 
   42 #include <sys/param.h>
   43 #include <sys/systm.h>
   44 #include <sys/mbuf.h>
   45 #include <sys/malloc.h>
   46 #include <sys/endian.h>
   47 #include <sys/kernel.h>
   48 #include <sys/sysctl.h>
   49 #include <sys/pcpu.h>
   50 #include <sys/proc.h>
   51 #include <sys/ucred.h>
   52 #include <sys/alq.h>
   53 
   54 #include <sys/socket.h>
   55 
   56 #include <net/if.h>
   57 #include <net/if_var.h>
   58 #include <net/if_media.h>
   59 #include <net/ethernet.h>
   60 
   61 #include <net80211/ieee80211_var.h>
   62 #include <net80211/ieee80211_freebsd.h>
   63 #include <net80211/ieee80211_alq.h>
   64 
   65 static struct alq *ieee80211_alq;
   66 static int ieee80211_alq_lost;
   67 static int ieee80211_alq_logged;
   68 static char ieee80211_alq_logfile[MAXPATHLEN] = "/tmp/net80211.log";
   69 static unsigned int ieee80211_alq_qsize = 64*1024;
   70 
   71 static int
   72 ieee80211_alq_setlogging(int enable)
   73 {
   74         int error;
   75 
   76         if (enable) {
   77                 if (ieee80211_alq)
   78                         alq_close(ieee80211_alq);
   79 
   80                 error = alq_open(&ieee80211_alq,
   81                     ieee80211_alq_logfile,
   82                     curthread->td_ucred,
   83                     ALQ_DEFAULT_CMODE,
   84                     ieee80211_alq_qsize, 0);
   85                 ieee80211_alq_lost = 0;
   86                 ieee80211_alq_logged = 0;
   87                 printf("net80211: logging to %s enabled; "
   88                     "struct size %d bytes\n",
   89                     ieee80211_alq_logfile,
   90                     (int) sizeof(struct ieee80211_alq_rec));
   91         } else {
   92                 if (ieee80211_alq)
   93                         alq_close(ieee80211_alq);
   94                 ieee80211_alq = NULL;
   95                 printf("net80211: logging disabled\n");
   96                 error = 0;
   97         }
   98         return (error);
   99 }
  100 
  101 static int
  102 sysctl_ieee80211_alq_log(SYSCTL_HANDLER_ARGS)
  103 {
  104         int error, enable;
  105 
  106         enable = (ieee80211_alq != NULL);
  107         error = sysctl_handle_int(oidp, &enable, 0, req);
  108         if (error || !req->newptr)
  109                 return (error);
  110         else
  111                 return (ieee80211_alq_setlogging(enable));
  112 }
  113 
  114 SYSCTL_PROC(_net_wlan, OID_AUTO, alq,
  115     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, 0, 0,
  116     sysctl_ieee80211_alq_log, "I",
  117     "Enable net80211 alq logging");
  118 SYSCTL_INT(_net_wlan, OID_AUTO, alq_size, CTLFLAG_RW,
  119         &ieee80211_alq_qsize, 0, "In-memory log size (bytes)");
  120 SYSCTL_INT(_net_wlan, OID_AUTO, alq_lost, CTLFLAG_RW,
  121         &ieee80211_alq_lost, 0, "Debugging operations not logged");
  122 SYSCTL_INT(_net_wlan, OID_AUTO, alq_logged, CTLFLAG_RW,
  123         &ieee80211_alq_logged, 0, "Debugging operations logged");
  124 
  125 static struct ale *
  126 ieee80211_alq_get(size_t len)
  127 {
  128         struct ale *ale;
  129 
  130         ale = alq_getn(ieee80211_alq, len + sizeof(struct ieee80211_alq_rec),
  131             ALQ_NOWAIT);
  132         if (!ale)
  133                 ieee80211_alq_lost++;
  134         else
  135                 ieee80211_alq_logged++;
  136         return ale;
  137 }
  138 
  139 int
  140 ieee80211_alq_log(struct ieee80211com *ic, struct ieee80211vap *vap,
  141     uint32_t op, uint32_t flags, uint16_t srcid, const uint8_t *src,
  142     size_t len)
  143 {
  144         struct ale *ale;
  145         struct ieee80211_alq_rec *r;
  146         char *dst;
  147 
  148         /* Don't log if we're disabled */
  149         if (ieee80211_alq == NULL)
  150                 return (0);
  151 
  152         if (len > IEEE80211_ALQ_MAX_PAYLOAD)
  153                 return (ENOMEM);
  154 
  155         ale = ieee80211_alq_get(len);
  156         if (! ale)
  157                 return (ENOMEM);
  158 
  159         r = (struct ieee80211_alq_rec *) ale->ae_data;
  160         dst = ((char *) r) + sizeof(struct ieee80211_alq_rec);
  161         r->r_timestamp = htobe64(ticks);
  162         if (vap != NULL) {
  163                 r->r_wlan = htobe16(vap->iv_ifp->if_dunit);
  164         } else {
  165                 r->r_wlan = 0xffff;
  166         }
  167         r->r_src = htobe16(srcid);
  168         r->r_flags = htobe32(flags);
  169         r->r_op = htobe32(op);
  170         r->r_len = htobe32(len + sizeof(struct ieee80211_alq_rec));
  171         r->r_threadid = htobe32((uint32_t) curthread->td_tid);
  172 
  173         if (src != NULL)
  174                 memcpy(dst, src, len);
  175 
  176         alq_post(ieee80211_alq, ale);
  177 
  178         return (0);
  179 }

Cache object: d4b330c96b1ccfb8ddd4b97c5a4531f5


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