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 } 180