Date: Mon, 12 Jan 2009 22:50:55 +0000 (UTC) From: Sam Leffler <sam@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r187120 - in head/tools/tools/net80211: . wlantxtime Message-ID: <200901122250.n0CMotCw078634@svn.freebsd.org>
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Author: sam Date: Mon Jan 12 22:50:55 2009 New Revision: 187120 URL: http://svn.freebsd.org/changeset/base/187120 Log: add tool to calculate air time for 802.11 packets Added: head/tools/tools/net80211/wlantxtime/ head/tools/tools/net80211/wlantxtime/Makefile (contents, props changed) head/tools/tools/net80211/wlantxtime/wlantxtime.c (contents, props changed) Modified: head/tools/tools/net80211/Makefile Modified: head/tools/tools/net80211/Makefile ============================================================================== --- head/tools/tools/net80211/Makefile Mon Jan 12 22:37:05 2009 (r187119) +++ head/tools/tools/net80211/Makefile Mon Jan 12 22:50:55 2009 (r187120) @@ -1,5 +1,5 @@ # $FreeBSD$ -SUBDIR= stumbler w00t wesside wlaninject wlanstats wlanwatch wlanwds +SUBDIR= stumbler w00t wesside wlaninject wlanstats wlantxtime wlanwatch wlanwds .include <bsd.subdir.mk> Added: head/tools/tools/net80211/wlantxtime/Makefile ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/tools/tools/net80211/wlantxtime/Makefile Mon Jan 12 22:50:55 2009 (r187120) @@ -0,0 +1,7 @@ +# $FreeBSD$ + +PROG= wlantxtime +BINDIR= /usr/local/bin +NO_MAN= + +.include <bsd.prog.mk> Added: head/tools/tools/net80211/wlantxtime/wlantxtime.c ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/tools/tools/net80211/wlantxtime/wlantxtime.c Mon Jan 12 22:50:55 2009 (r187120) @@ -0,0 +1,596 @@ +/*- + * Copyright (c) 2007-2009 Sam Leffler, Errno Consulting + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +/* + * IEEE 802.11 PHY-related support. + */ + +#include <sys/param.h> +#include <sys/types.h> + +#include <net/if_llc.h> + +#include <net80211/_ieee80211.h> +#include <net80211/ieee80211.h> + +#define IEEE80211_F_SHPREAMBLE 0x00040000 /* STATUS: use short preamble */ + +#include <err.h> +#include <stdio.h> +#include <stdarg.h> +#include <stdlib.h> +#include <strings.h> +#include <unistd.h> + +struct ieee80211_rate_table { + int rateCount; /* NB: for proper padding */ + uint8_t rateCodeToIndex[256]; /* back mapping */ + struct { + uint8_t phy; /* CCK/OFDM/TURBO */ + uint32_t rateKbps; /* transfer rate in kbs */ + uint8_t shortPreamble; /* mask for enabling short + * preamble in CCK rate code */ + uint8_t dot11Rate; /* value for supported rates + * info element of MLME */ + uint8_t ctlRateIndex; /* index of next lower basic + * rate; used for dur. calcs */ + uint16_t lpAckDuration; /* long preamble ACK dur. */ + uint16_t spAckDuration; /* short preamble ACK dur. */ + } info[32]; +}; + +uint16_t +ieee80211_compute_duration(const struct ieee80211_rate_table *rt, + uint32_t frameLen, uint16_t rate, int isShortPreamble); + +#define KASSERT(c, msg) do { \ + if (!(c)) { \ + printf msg; \ + putchar('\n'); \ + exit(-1); \ + } \ +} while (0) + +static void +panic(const char *fmt, ...) +{ + va_list ap; + + va_start(ap, fmt); + vprintf(fmt, ap); + va_end(ap); + exit(-1); +} + +/* shorthands to compact tables for readability */ +#define OFDM IEEE80211_T_OFDM +#define CCK IEEE80211_T_CCK +#define TURBO IEEE80211_T_TURBO +#define PBCC (IEEE80211_T_HT+1) /* XXX */ +#define B(r) (0x80 | r) +#define Mb(x) (x*1000) + +static struct ieee80211_rate_table ieee80211_11b_table = { + .rateCount = 4, /* XXX no PBCC */ + .info = { +/* short ctrl */ +/* Preamble dot11Rate Rate */ + [0] = { .phy = CCK, 1000, 0x00, B(2), 0 },/* 1 Mb */ + [1] = { .phy = CCK, 2000, 0x04, B(4), 1 },/* 2 Mb */ + [2] = { .phy = CCK, 5500, 0x04, B(11), 1 },/* 5.5 Mb */ + [3] = { .phy = CCK, 11000, 0x04, B(22), 1 },/* 11 Mb */ + [4] = { .phy = PBCC, 22000, 0x04, 44, 3 } /* 22 Mb */ + }, +}; + +static struct ieee80211_rate_table ieee80211_11g_table = { + .rateCount = 12, + .info = { +/* short ctrl */ +/* Preamble dot11Rate Rate */ + [0] = { .phy = CCK, 1000, 0x00, B(2), 0 }, + [1] = { .phy = CCK, 2000, 0x04, B(4), 1 }, + [2] = { .phy = CCK, 5500, 0x04, B(11), 2 }, + [3] = { .phy = CCK, 11000, 0x04, B(22), 3 }, + [4] = { .phy = OFDM, 6000, 0x00, 12, 4 }, + [5] = { .phy = OFDM, 9000, 0x00, 18, 4 }, + [6] = { .phy = OFDM, 12000, 0x00, 24, 6 }, + [7] = { .phy = OFDM, 18000, 0x00, 36, 6 }, + [8] = { .phy = OFDM, 24000, 0x00, 48, 8 }, + [9] = { .phy = OFDM, 36000, 0x00, 72, 8 }, + [10] = { .phy = OFDM, 48000, 0x00, 96, 8 }, + [11] = { .phy = OFDM, 54000, 0x00, 108, 8 } + }, +}; + +static struct ieee80211_rate_table ieee80211_11a_table = { + .rateCount = 8, + .info = { +/* short ctrl */ +/* Preamble dot11Rate Rate */ + [0] = { .phy = OFDM, 6000, 0x00, B(12), 0 }, + [1] = { .phy = OFDM, 9000, 0x00, 18, 0 }, + [2] = { .phy = OFDM, 12000, 0x00, B(24), 2 }, + [3] = { .phy = OFDM, 18000, 0x00, 36, 2 }, + [4] = { .phy = OFDM, 24000, 0x00, B(48), 4 }, + [5] = { .phy = OFDM, 36000, 0x00, 72, 4 }, + [6] = { .phy = OFDM, 48000, 0x00, 96, 4 }, + [7] = { .phy = OFDM, 54000, 0x00, 108, 4 } + }, +}; + +static struct ieee80211_rate_table ieee80211_half_table = { + .rateCount = 8, + .info = { +/* short ctrl */ +/* Preamble dot11Rate Rate */ + [0] = { .phy = OFDM, 3000, 0x00, B(6), 0 }, + [1] = { .phy = OFDM, 4500, 0x00, 9, 0 }, + [2] = { .phy = OFDM, 6000, 0x00, B(12), 2 }, + [3] = { .phy = OFDM, 9000, 0x00, 18, 2 }, + [4] = { .phy = OFDM, 12000, 0x00, B(24), 4 }, + [5] = { .phy = OFDM, 18000, 0x00, 36, 4 }, + [6] = { .phy = OFDM, 24000, 0x00, 48, 4 }, + [7] = { .phy = OFDM, 27000, 0x00, 54, 4 } + }, +}; + +static struct ieee80211_rate_table ieee80211_quarter_table = { + .rateCount = 8, + .info = { +/* short ctrl */ +/* Preamble dot11Rate Rate */ + [0] = { .phy = OFDM, 1500, 0x00, B(3), 0 }, + [1] = { .phy = OFDM, 2250, 0x00, 4, 0 }, + [2] = { .phy = OFDM, 3000, 0x00, B(9), 2 }, + [3] = { .phy = OFDM, 4500, 0x00, 9, 2 }, + [4] = { .phy = OFDM, 6000, 0x00, B(12), 4 }, + [5] = { .phy = OFDM, 9000, 0x00, 18, 4 }, + [6] = { .phy = OFDM, 12000, 0x00, 24, 4 }, + [7] = { .phy = OFDM, 13500, 0x00, 27, 4 } + }, +}; + +static struct ieee80211_rate_table ieee80211_turbog_table = { + .rateCount = 7, + .info = { +/* short ctrl */ +/* Preamble dot11Rate Rate */ + [0] = { .phy = TURBO, 12000, 0x00, B(12), 0 }, + [1] = { .phy = TURBO, 24000, 0x00, B(24), 1 }, + [2] = { .phy = TURBO, 36000, 0x00, 36, 1 }, + [3] = { .phy = TURBO, 48000, 0x00, B(48), 3 }, + [4] = { .phy = TURBO, 72000, 0x00, 72, 3 }, + [5] = { .phy = TURBO, 96000, 0x00, 96, 3 }, + [6] = { .phy = TURBO, 108000, 0x00, 108, 3 } + }, +}; + +static struct ieee80211_rate_table ieee80211_turboa_table = { + .rateCount = 8, + .info = { +/* short ctrl */ +/* Preamble dot11Rate Rate */ + [0] = { .phy = TURBO, 12000, 0x00, B(12), 0 }, + [1] = { .phy = TURBO, 18000, 0x00, 18, 0 }, + [2] = { .phy = TURBO, 24000, 0x00, B(24), 2 }, + [3] = { .phy = TURBO, 36000, 0x00, 36, 2 }, + [4] = { .phy = TURBO, 48000, 0x00, B(48), 4 }, + [5] = { .phy = TURBO, 72000, 0x00, 72, 4 }, + [6] = { .phy = TURBO, 96000, 0x00, 96, 4 }, + [7] = { .phy = TURBO, 108000, 0x00, 108, 4 } + }, +}; + +#undef Mb +#undef B +#undef OFDM +#undef CCK +#undef TURBO +#undef XR + +/* + * Setup a rate table's reverse lookup table and fill in + * ack durations. The reverse lookup tables are assumed + * to be initialized to zero (or at least the first entry). + * We use this as a key that indicates whether or not + * we've previously setup the reverse lookup table. + * + * XXX not reentrant, but shouldn't matter + */ +static void +ieee80211_setup_ratetable(struct ieee80211_rate_table *rt) +{ +#define N(a) (sizeof(a)/sizeof(a[0])) +#define WLAN_CTRL_FRAME_SIZE \ + (sizeof(struct ieee80211_frame_ack) + IEEE80211_CRC_LEN) + + int i; + + for (i = 0; i < N(rt->rateCodeToIndex); i++) + rt->rateCodeToIndex[i] = (uint8_t) -1; + for (i = 0; i < rt->rateCount; i++) { + uint8_t code = rt->info[i].dot11Rate; + uint8_t cix = rt->info[i].ctlRateIndex; + uint8_t ctl_rate = rt->info[cix].dot11Rate; + + rt->rateCodeToIndex[code] = i; + if (code & IEEE80211_RATE_BASIC) { + /* + * Map w/o basic rate bit too. + */ + code &= IEEE80211_RATE_VAL; + rt->rateCodeToIndex[code] = i; + } + + /* + * XXX for 11g the control rate to use for 5.5 and 11 Mb/s + * depends on whether they are marked as basic rates; + * the static tables are setup with an 11b-compatible + * 2Mb/s rate which will work but is suboptimal + * + * NB: Control rate is always less than or equal to the + * current rate, so control rate's reverse lookup entry + * has been installed and following call is safe. + */ + rt->info[i].lpAckDuration = ieee80211_compute_duration(rt, + WLAN_CTRL_FRAME_SIZE, ctl_rate, 0); + rt->info[i].spAckDuration = ieee80211_compute_duration(rt, + WLAN_CTRL_FRAME_SIZE, ctl_rate, IEEE80211_F_SHPREAMBLE); + } + +#undef WLAN_CTRL_FRAME_SIZE +#undef N +} + +/* Setup all rate tables */ +static void +ieee80211_phy_init(void) +{ +#define N(arr) (int)(sizeof(arr) / sizeof(arr[0])) + static struct ieee80211_rate_table * const ratetables[] = { + &ieee80211_half_table, + &ieee80211_quarter_table, + &ieee80211_11a_table, + &ieee80211_11g_table, + &ieee80211_turbog_table, + &ieee80211_turboa_table, + &ieee80211_turboa_table, + &ieee80211_11a_table, + &ieee80211_11g_table, + &ieee80211_11b_table + }; + int i; + + for (i = 0; i < N(ratetables); ++i) + ieee80211_setup_ratetable(ratetables[i]); + +#undef N +} + +/* + * Compute the time to transmit a frame of length frameLen bytes + * using the specified rate, phy, and short preamble setting. + * SIFS is included. + */ +uint16_t +ieee80211_compute_duration(const struct ieee80211_rate_table *rt, + uint32_t frameLen, uint16_t rate, int isShortPreamble) +{ + uint8_t rix = rt->rateCodeToIndex[rate]; + uint32_t bitsPerSymbol, numBits, numSymbols, phyTime, txTime; + uint32_t kbps; + + KASSERT(rix != (uint8_t)-1, ("rate %d has no info", rate)); + kbps = rt->info[rix].rateKbps; + if (kbps == 0) /* XXX bandaid for channel changes */ + return 0; + + switch (rt->info[rix].phy) { + case IEEE80211_T_CCK: +#define CCK_SIFS_TIME 10 +#define CCK_PREAMBLE_BITS 144 +#define CCK_PLCP_BITS 48 + phyTime = CCK_PREAMBLE_BITS + CCK_PLCP_BITS; + if (isShortPreamble && rt->info[rix].shortPreamble) + phyTime >>= 1; + numBits = frameLen << 3; + txTime = CCK_SIFS_TIME + phyTime + + ((numBits * 1000)/kbps); + break; +#undef CCK_SIFS_TIME +#undef CCK_PREAMBLE_BITS +#undef CCK_PLCP_BITS + + case IEEE80211_T_OFDM: +#define OFDM_SIFS_TIME 16 +#define OFDM_PREAMBLE_TIME 20 +#define OFDM_PLCP_BITS 22 +#define OFDM_SYMBOL_TIME 4 + +#define OFDM_SIFS_TIME_HALF 32 +#define OFDM_PREAMBLE_TIME_HALF 40 +#define OFDM_PLCP_BITS_HALF 22 +#define OFDM_SYMBOL_TIME_HALF 8 + +#define OFDM_SIFS_TIME_QUARTER 64 +#define OFDM_PREAMBLE_TIME_QUARTER 80 +#define OFDM_PLCP_BITS_QUARTER 22 +#define OFDM_SYMBOL_TIME_QUARTER 16 + if (rt == &ieee80211_half_table) { + bitsPerSymbol = (kbps * OFDM_SYMBOL_TIME_QUARTER) / 1000; + KASSERT(bitsPerSymbol != 0, ("1/2 rate bps")); + + numBits = OFDM_PLCP_BITS + (frameLen << 3); + numSymbols = howmany(numBits, bitsPerSymbol); + txTime = OFDM_SIFS_TIME_QUARTER + + OFDM_PREAMBLE_TIME_QUARTER + + (numSymbols * OFDM_SYMBOL_TIME_QUARTER); + } else if (rt == &ieee80211_quarter_table) { + bitsPerSymbol = (kbps * OFDM_SYMBOL_TIME_HALF) / 1000; + KASSERT(bitsPerSymbol != 0, ("1/4 rate bps")); + + numBits = OFDM_PLCP_BITS + (frameLen << 3); + numSymbols = howmany(numBits, bitsPerSymbol); + txTime = OFDM_SIFS_TIME_HALF + + OFDM_PREAMBLE_TIME_HALF + + (numSymbols * OFDM_SYMBOL_TIME_HALF); + } else { /* full rate channel */ + bitsPerSymbol = (kbps * OFDM_SYMBOL_TIME) / 1000; + KASSERT(bitsPerSymbol != 0, ("full rate bps")); + + numBits = OFDM_PLCP_BITS + (frameLen << 3); + numSymbols = howmany(numBits, bitsPerSymbol); + txTime = OFDM_SIFS_TIME + + OFDM_PREAMBLE_TIME + + (numSymbols * OFDM_SYMBOL_TIME); + } + break; + +#undef OFDM_SIFS_TIME +#undef OFDM_PREAMBLE_TIME +#undef OFDM_PLCP_BITS +#undef OFDM_SYMBOL_TIME + + case IEEE80211_T_TURBO: +#define TURBO_SIFS_TIME 8 +#define TURBO_PREAMBLE_TIME 14 +#define TURBO_PLCP_BITS 22 +#define TURBO_SYMBOL_TIME 4 + /* we still save OFDM rates in kbps - so double them */ + bitsPerSymbol = ((kbps << 1) * TURBO_SYMBOL_TIME) / 1000; + KASSERT(bitsPerSymbol != 0, ("turbo bps")); + + numBits = TURBO_PLCP_BITS + (frameLen << 3); + numSymbols = howmany(numBits, bitsPerSymbol); + txTime = TURBO_SIFS_TIME + TURBO_PREAMBLE_TIME + + (numSymbols * TURBO_SYMBOL_TIME); + break; +#undef TURBO_SIFS_TIME +#undef TURBO_PREAMBLE_TIME +#undef TURBO_PLCP_BITS +#undef TURBO_SYMBOL_TIME + + default: + panic("%s: unknown phy %u (rate %u)\n", __func__, + rt->info[rix].phy, rate); + break; + } + return txTime; +} + +#define OFDM_PLCP_BITS 22 +#define HT_L_STF 8 +#define HT_L_LTF 8 +#define HT_L_SIG 4 +#define HT_SIG 8 +#define HT_STF 4 +#define HT_LTF(n) ((n) * 4) + +uint32_t +ieee80211_compute_duration_ht(const struct ieee80211_rate_table *rt, + uint32_t frameLen, uint16_t rate, + int streams, int isht40, int isShortGI) +{ + static const uint16_t ht20_bps[16] = { + 26, 52, 78, 104, 156, 208, 234, 260, + 52, 104, 156, 208, 312, 416, 468, 520 + }; + static const uint16_t ht40_bps[16] = { + 54, 108, 162, 216, 324, 432, 486, 540, + 108, 216, 324, 432, 648, 864, 972, 1080, + }; + uint32_t bitsPerSymbol, numBits, numSymbols, txTime; + + KASSERT(rate & IEEE80211_RATE_MCS, ("not mcs %d", rate)); + KASSERT((rate &~ IEEE80211_RATE_MCS) < 16, ("bad mcs 0x%x", rate)); + + if (isht40) + bitsPerSymbol = ht40_bps[rate & 0xf]; + else + bitsPerSymbol = ht20_bps[rate & 0xf]; + numBits = OFDM_PLCP_BITS + (frameLen << 3); + numSymbols = howmany(numBits, bitsPerSymbol); + if (isShortGI) + txTime = ((numSymbols * 18) + 4) / 5; /* 3.6us */ + else + txTime = numSymbols * 4; /* 4us */ + return txTime + HT_L_STF + HT_L_LTF + + HT_L_SIG + HT_SIG + HT_STF + HT_LTF(streams); +} + +static const struct ieee80211_rate_table * +mode2table(const char *mode) +{ + if (strcasecmp(mode, "half") == 0) + return &ieee80211_half_table; + else if (strcasecmp(mode, "quarter") == 0) + return &ieee80211_quarter_table; + else if (strcasecmp(mode, "hta") == 0) + return &ieee80211_11a_table; /* XXX */ + else if (strcasecmp(mode, "htg") == 0) + return &ieee80211_11g_table; /* XXX */ + else if (strcasecmp(mode, "108g") == 0) + return &ieee80211_turbog_table; + else if (strcasecmp(mode, "sturbo") == 0) + return &ieee80211_turboa_table; + else if (strcasecmp(mode, "turbo") == 0) + return &ieee80211_turboa_table; + else if (strcasecmp(mode, "11a") == 0) + return &ieee80211_11a_table; + else if (strcasecmp(mode, "11g") == 0) + return &ieee80211_11g_table; + else if (strcasecmp(mode, "11b") == 0) + return &ieee80211_11b_table; + else + return NULL; +} + +const char * +srate(int rate) +{ + static char buf[32]; + if (rate & 1) + snprintf(buf, sizeof(buf), "%u.5", rate/2); + else + snprintf(buf, sizeof(buf), "%u", rate/2); + return buf; +} + +static int +checkpreamble(const struct ieee80211_rate_table *rt, uint8_t rix, + int isShortPreamble, int verbose) +{ + if (isShortPreamble) { + if (rt->info[rix].phy != IEEE80211_T_CCK) { + if (verbose) + warnx("short preamble not meaningful, ignored"); + isShortPreamble = 0; + } else if (!rt->info[rix].shortPreamble) { + if (verbose) + warnx("short preamble not meaningful with " + "rate %s, ignored", + srate(rt->info[rix].dot11Rate &~ IEEE80211_RATE_BASIC)); + isShortPreamble = 0; + } + } + return isShortPreamble; +} + +static void +usage(const char *progname) +{ + fprintf(stderr, "usage: %s [-a] [-l framelen] [-m mode] [-r rate] [-s]\n", + progname); + fprintf(stderr, "-a display calculations for all possible rates\n"); + fprintf(stderr, "-l framelen length in bytes of 802.11 payload (default 1536)\n"); + fprintf(stderr, "-m 11a calculate for 11a channel\n"); + fprintf(stderr, "-m 11b calculate for 11b channel\n"); + fprintf(stderr, "-m 11g calculate for 11g channel (default)\n"); + fprintf(stderr, "-m half calculate for 1/2 width channel\n"); + fprintf(stderr, "-m quarter calculate for 1/4 width channel\n"); + fprintf(stderr, "-m 108g calculate for dynamic turbo 11g channel\n"); + fprintf(stderr, "-m sturbo calculate for static turbo channel\n"); + fprintf(stderr, "-m turbo calculate for dynamic turbo 11a channel\n"); + fprintf(stderr, "-r rate IEEE rate code (default 54)\n"); + fprintf(stderr, "-s short preamble (default long)\n"); + exit(0); +} + +int +main(int argc, char *argv[]) +{ + const struct ieee80211_rate_table *rt; + const char *mode; + uint32_t frameLen; + uint16_t rate; + uint16_t time; + uint8_t rix; + int ch, allrates, isShortPreamble, isShort; + float frate; + + ieee80211_phy_init(); + + mode = "11g"; + isShortPreamble = 0; + frameLen = 1500 + + sizeof(struct ieee80211_frame) + + LLC_SNAPFRAMELEN + + IEEE80211_CRC_LEN + ; + rate = 2*54; + allrates = 0; + while ((ch = getopt(argc, argv, "al:m:r:s")) != -1) { + switch (ch) { + case 'a': + allrates = 1; + break; + case 'l': + frameLen = strtoul(optarg, NULL, 0); + break; + case 'm': + mode = optarg; + break; + case 'r': + frate = atof(optarg); + rate = (int) 2*frate; + break; + case 's': + isShortPreamble = 1; + break; + default: + usage(argv[0]); + break; + } + } + rt = mode2table(mode); + if (rt == NULL) + errx(-1, "unknown mode %s", mode); + if (!allrates) { + rix = rt->rateCodeToIndex[rate]; + if (rix == (uint8_t) -1) + errx(-1, "rate %s not valid for mode %s", srate(rate), mode); + isShort = checkpreamble(rt, rix, isShortPreamble, 1); + + time = ieee80211_compute_duration(rt, frameLen, rate, isShort); + printf("%u usec to send %u bytes @ %s Mb/s, %s preamble\n", + time, frameLen, srate(rate), + isShort ? "short" : "long"); + } else { + for (rix = 0; rix < rt->rateCount; rix++) { + rate = rt->info[rix].dot11Rate &~ IEEE80211_RATE_BASIC; + isShort = checkpreamble(rt, rix, isShortPreamble, 0); + time = ieee80211_compute_duration(rt, frameLen, rate, + isShort); + printf("%u usec to send %u bytes @ %s Mb/s, %s preamble\n", + time, frameLen, srate(rate), + isShort ? "short" : "long"); + } + } + return 0; +}
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