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("$FreeBSD$"); 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 ieee80211_alq_qsize, 0); 83 ieee80211_alq_lost = 0; 84 ieee80211_alq_logged = 0; 85 printf("net80211: logging to %s enabled; " 86 "struct size %d bytes\n", 87 ieee80211_alq_logfile, 88 (int) sizeof(struct ieee80211_alq_rec)); 89 } else { 90 if (ieee80211_alq) 91 alq_close(ieee80211_alq); 92 ieee80211_alq = NULL; 93 printf("net80211: logging disabled\n"); 94 error = 0; 95 } 96 return (error); 97 } 98 99 static int 100 sysctl_ieee80211_alq_log(SYSCTL_HANDLER_ARGS) 101 { 102 int error, enable; 103 104 enable = (ieee80211_alq != NULL); 105 error = sysctl_handle_int(oidp, &enable, 0, req); 106 if (error || !req->newptr) 107 return (error); 108 else 109 return (ieee80211_alq_setlogging(enable)); 110 } 111 112 SYSCTL_PROC(_net_wlan, OID_AUTO, alq, CTLTYPE_INT|CTLFLAG_RW, 113 0, 0, sysctl_ieee80211_alq_log, "I", "Enable net80211 alq logging"); 114 SYSCTL_INT(_net_wlan, OID_AUTO, alq_size, CTLFLAG_RW, 115 &ieee80211_alq_qsize, 0, "In-memory log size (bytes)"); 116 SYSCTL_INT(_net_wlan, OID_AUTO, alq_lost, CTLFLAG_RW, 117 &ieee80211_alq_lost, 0, "Debugging operations not logged"); 118 SYSCTL_INT(_net_wlan, OID_AUTO, alq_logged, CTLFLAG_RW, 119 &ieee80211_alq_logged, 0, "Debugging operations logged"); 120 121 static struct ale * 122 ieee80211_alq_get(size_t len) 123 { 124 struct ale *ale; 125 126 ale = alq_getn(ieee80211_alq, len + sizeof(struct ieee80211_alq_rec), 127 ALQ_NOWAIT); 128 if (!ale) 129 ieee80211_alq_lost++; 130 else 131 ieee80211_alq_logged++; 132 return ale; 133 } 134 135 int 136 ieee80211_alq_log(struct ieee80211com *ic, struct ieee80211vap *vap, 137 uint32_t op, uint32_t flags, uint16_t srcid, const uint8_t *src, 138 size_t len) 139 { 140 struct ale *ale; 141 struct ieee80211_alq_rec *r; 142 char *dst; 143 144 /* Don't log if we're disabled */ 145 if (ieee80211_alq == NULL) 146 return (0); 147 148 if (len > IEEE80211_ALQ_MAX_PAYLOAD) 149 return (ENOMEM); 150 151 ale = ieee80211_alq_get(len); 152 if (! ale) 153 return (ENOMEM); 154 155 r = (struct ieee80211_alq_rec *) ale->ae_data; 156 dst = ((char *) r) + sizeof(struct ieee80211_alq_rec); 157 r->r_timestamp = htobe64(ticks); 158 if (vap != NULL) { 159 r->r_wlan = htobe16(vap->iv_ifp->if_dunit); 160 } else { 161 r->r_wlan = 0xffff; 162 } 163 r->r_src = htobe16(srcid); 164 r->r_flags = htobe32(flags); 165 r->r_op = htobe32(op); 166 r->r_len = htobe32(len + sizeof(struct ieee80211_alq_rec)); 167 r->r_threadid = htobe32((uint32_t) curthread->td_tid); 168 169 if (src != NULL) 170 memcpy(dst, src, len); 171 172 alq_post(ieee80211_alq, ale); 173 174 return (0); 175 } 176