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 /* 29 * net80211 fast-logging support, primarily for debugging. 30 * 31 * This implements a single debugging queue which includes 32 * per-device enumeration where needed. 33 */ 34 35 #include "opt_wlan.h" 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/mbuf.h> 40 #include <sys/malloc.h> 41 #include <sys/endian.h> 42 #include <sys/kernel.h> 43 #include <sys/sysctl.h> 44 #include <sys/pcpu.h> 45 #include <sys/proc.h> 46 #include <sys/ucred.h> 47 #include <sys/alq.h> 48 49 #include <sys/socket.h> 50 51 #include <net/if.h> 52 #include <net/if_var.h> 53 #include <net/if_media.h> 54 #include <net/ethernet.h> 55 56 #include <net80211/ieee80211_var.h> 57 #include <net80211/ieee80211_freebsd.h> 58 #include <net80211/ieee80211_alq.h> 59 60 static struct alq *ieee80211_alq; 61 static int ieee80211_alq_lost; 62 static int ieee80211_alq_logged; 63 static char ieee80211_alq_logfile[MAXPATHLEN] = "/tmp/net80211.log"; 64 static unsigned int ieee80211_alq_qsize = 64*1024; 65 66 static int 67 ieee80211_alq_setlogging(int enable) 68 { 69 int error; 70 71 if (enable) { 72 if (ieee80211_alq) 73 alq_close(ieee80211_alq); 74 75 error = alq_open(&ieee80211_alq, 76 ieee80211_alq_logfile, 77 curthread->td_ucred, 78 ALQ_DEFAULT_CMODE, 79 ieee80211_alq_qsize, 0); 80 ieee80211_alq_lost = 0; 81 ieee80211_alq_logged = 0; 82 printf("net80211: logging to %s enabled; " 83 "struct size %d bytes\n", 84 ieee80211_alq_logfile, 85 (int) sizeof(struct ieee80211_alq_rec)); 86 } else { 87 if (ieee80211_alq) 88 alq_close(ieee80211_alq); 89 ieee80211_alq = NULL; 90 printf("net80211: logging disabled\n"); 91 error = 0; 92 } 93 return (error); 94 } 95 96 static int 97 sysctl_ieee80211_alq_log(SYSCTL_HANDLER_ARGS) 98 { 99 int error, enable; 100 101 enable = (ieee80211_alq != NULL); 102 error = sysctl_handle_int(oidp, &enable, 0, req); 103 if (error || !req->newptr) 104 return (error); 105 else 106 return (ieee80211_alq_setlogging(enable)); 107 } 108 109 SYSCTL_PROC(_net_wlan, OID_AUTO, alq, 110 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, 0, 0, 111 sysctl_ieee80211_alq_log, "I", 112 "Enable net80211 alq logging"); 113 SYSCTL_INT(_net_wlan, OID_AUTO, alq_size, CTLFLAG_RW, 114 &ieee80211_alq_qsize, 0, "In-memory log size (bytes)"); 115 SYSCTL_INT(_net_wlan, OID_AUTO, alq_lost, CTLFLAG_RW, 116 &ieee80211_alq_lost, 0, "Debugging operations not logged"); 117 SYSCTL_INT(_net_wlan, OID_AUTO, alq_logged, CTLFLAG_RW, 118 &ieee80211_alq_logged, 0, "Debugging operations logged"); 119 120 static struct ale * 121 ieee80211_alq_get(size_t len) 122 { 123 struct ale *ale; 124 125 ale = alq_getn(ieee80211_alq, len + sizeof(struct ieee80211_alq_rec), 126 ALQ_NOWAIT); 127 if (!ale) 128 ieee80211_alq_lost++; 129 else 130 ieee80211_alq_logged++; 131 return ale; 132 } 133 134 int 135 ieee80211_alq_log(struct ieee80211com *ic, struct ieee80211vap *vap, 136 uint32_t op, uint32_t flags, uint16_t srcid, const uint8_t *src, 137 size_t len) 138 { 139 struct ale *ale; 140 struct ieee80211_alq_rec *r; 141 char *dst; 142 143 /* Don't log if we're disabled */ 144 if (ieee80211_alq == NULL) 145 return (0); 146 147 if (len > IEEE80211_ALQ_MAX_PAYLOAD) 148 return (ENOMEM); 149 150 ale = ieee80211_alq_get(len); 151 if (! ale) 152 return (ENOMEM); 153 154 r = (struct ieee80211_alq_rec *) ale->ae_data; 155 dst = ((char *) r) + sizeof(struct ieee80211_alq_rec); 156 r->r_timestamp = htobe64(ticks); 157 if (vap != NULL) { 158 r->r_wlan = htobe16(vap->iv_ifp->if_dunit); 159 } else { 160 r->r_wlan = 0xffff; 161 } 162 r->r_src = htobe16(srcid); 163 r->r_flags = htobe32(flags); 164 r->r_op = htobe32(op); 165 r->r_len = htobe32(len + sizeof(struct ieee80211_alq_rec)); 166 r->r_threadid = htobe32((uint32_t) curthread->td_tid); 167 168 if (src != NULL) 169 memcpy(dst, src, len); 170 171 alq_post(ieee80211_alq, ale); 172 173 return (0); 174 } 175