1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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 #endif 31 32 /* 33 * net80211 fast-logging support, primarily for debugging. 34 * 35 * This implements a single debugging queue which includes 36 * per-device enumeration where needed. 37 */ 38 39 #include "opt_wlan.h" 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/mbuf.h> 44 #include <sys/malloc.h> 45 #include <sys/endian.h> 46 #include <sys/kernel.h> 47 #include <sys/sysctl.h> 48 #include <sys/pcpu.h> 49 #include <sys/proc.h> 50 #include <sys/ucred.h> 51 #include <sys/alq.h> 52 53 #include <sys/socket.h> 54 55 #include <net/if.h> 56 #include <net/if_var.h> 57 #include <net/if_media.h> 58 #include <net/ethernet.h> 59 60 #include <net80211/ieee80211_var.h> 61 #include <net80211/ieee80211_freebsd.h> 62 #include <net80211/ieee80211_alq.h> 63 64 static struct alq *ieee80211_alq; 65 static int ieee80211_alq_lost; 66 static int ieee80211_alq_logged; 67 static char ieee80211_alq_logfile[MAXPATHLEN] = "/tmp/net80211.log"; 68 static unsigned int ieee80211_alq_qsize = 64*1024; 69 70 static int 71 ieee80211_alq_setlogging(int enable) 72 { 73 int error; 74 75 if (enable) { 76 if (ieee80211_alq) 77 alq_close(ieee80211_alq); 78 79 error = alq_open(&ieee80211_alq, 80 ieee80211_alq_logfile, 81 curthread->td_ucred, 82 ALQ_DEFAULT_CMODE, 83 ieee80211_alq_qsize, 0); 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 (int) 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, 114 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, 0, 0, 115 sysctl_ieee80211_alq_log, "I", 116 "Enable net80211 alq logging"); 117 SYSCTL_INT(_net_wlan, OID_AUTO, alq_size, CTLFLAG_RW, 118 &ieee80211_alq_qsize, 0, "In-memory log size (bytes)"); 119 SYSCTL_INT(_net_wlan, OID_AUTO, alq_lost, CTLFLAG_RW, 120 &ieee80211_alq_lost, 0, "Debugging operations not logged"); 121 SYSCTL_INT(_net_wlan, OID_AUTO, alq_logged, CTLFLAG_RW, 122 &ieee80211_alq_logged, 0, "Debugging operations logged"); 123 124 static struct ale * 125 ieee80211_alq_get(size_t len) 126 { 127 struct ale *ale; 128 129 ale = alq_getn(ieee80211_alq, len + sizeof(struct ieee80211_alq_rec), 130 ALQ_NOWAIT); 131 if (!ale) 132 ieee80211_alq_lost++; 133 else 134 ieee80211_alq_logged++; 135 return ale; 136 } 137 138 int 139 ieee80211_alq_log(struct ieee80211com *ic, struct ieee80211vap *vap, 140 uint32_t op, uint32_t flags, uint16_t srcid, const uint8_t *src, 141 size_t len) 142 { 143 struct ale *ale; 144 struct ieee80211_alq_rec *r; 145 char *dst; 146 147 /* Don't log if we're disabled */ 148 if (ieee80211_alq == NULL) 149 return (0); 150 151 if (len > IEEE80211_ALQ_MAX_PAYLOAD) 152 return (ENOMEM); 153 154 ale = ieee80211_alq_get(len); 155 if (! ale) 156 return (ENOMEM); 157 158 r = (struct ieee80211_alq_rec *) ale->ae_data; 159 dst = ((char *) r) + sizeof(struct ieee80211_alq_rec); 160 r->r_timestamp = htobe64(ticks); 161 if (vap != NULL) { 162 r->r_wlan = htobe16(vap->iv_ifp->if_dunit); 163 } else { 164 r->r_wlan = 0xffff; 165 } 166 r->r_src = htobe16(srcid); 167 r->r_flags = htobe32(flags); 168 r->r_op = htobe32(op); 169 r->r_len = htobe32(len + sizeof(struct ieee80211_alq_rec)); 170 r->r_threadid = htobe32((uint32_t) curthread->td_tid); 171 172 if (src != NULL) 173 memcpy(dst, src, len); 174 175 alq_post(ieee80211_alq, ale); 176 177 return (0); 178 } 179