/* Caller checks len */
void
ieee80211_print_essid(u_int8_t *essid, u_int len)
{
u_int8_t *p;
int i;
if (len > IEEE80211_NWID_LEN)
len = IEEE80211_NWID_LEN;
/* determine printable or not */
for (i = 0, p = essid; i < len; i++, p++) {
if (*p < ' ' || *p > 0x7e)
break;
}
if (i == len) {
printf(" (");
for (i = 0, p = essid; i < len; i++, p++)
putchar(*p);
putchar(')');
} else
ieee80211_print_element(essid, len);
}
/* Caller checks len */
void
ieee80211_print_htcaps(u_int8_t *data, u_int len)
{
uint16_t htcaps, rxrate;
int smps, rxstbc;
uint8_t ampdu, txmcs;
int i;
uint8_t *rxmcs;
if (len < 2) {
ieee80211_print_element(data, len);
return;
}
htcaps = (data[0]) | (data[1] << 8);
printf("=<");
/* channel width */
if (htcaps & IEEE80211_HTCAP_CBW20_40)
printf("20/40MHz");
else
printf("20MHz");
/* LDPC coding */
if (htcaps & IEEE80211_HTCAP_LDPC)
printf(",LDPC");
/* spatial multiplexing power save mode */
smps = (htcaps & IEEE80211_HTCAP_SMPS_MASK)
>> IEEE80211_HTCAP_SMPS_SHIFT;
if (smps == 0)
printf(",SMPS static");
else if (smps == 1)
printf(",SMPS dynamic");
/* 11n greenfield mode */
if (htcaps & IEEE80211_HTCAP_GF)
printf(",greenfield");
/* short guard interval */
if (htcaps & IEEE80211_HTCAP_SGI20)
printf(",SGI@20MHz");
if (htcaps & IEEE80211_HTCAP_SGI40)
printf(",SGI@40MHz");
/* space-time block coding */
if (htcaps & IEEE80211_HTCAP_TXSTBC)
printf(",TXSTBC");
rxstbc = (htcaps & IEEE80211_HTCAP_RXSTBC_MASK)
>> IEEE80211_HTCAP_RXSTBC_SHIFT;
if (rxstbc > 0 && rxstbc < 4)
printf(",RXSTBC %d stream", rxstbc);
/* delayed block-ack */
if (htcaps & IEEE80211_HTCAP_DELAYEDBA)
printf(",delayed BA");
/* max A-MSDU length */
if (htcaps & IEEE80211_HTCAP_AMSDU7935)
printf(",A-MSDU 7935");
else
printf(",A-MSDU 3839");
/* DSSS/CCK in 40MHz mode */
if (htcaps & IEEE80211_HTCAP_DSSSCCK40)
printf(",DSSS/CCK@40MHz");
/* 40MHz intolerant */
if (htcaps & IEEE80211_HTCAP_40INTOLERANT)
printf(",40MHz intolerant");
/* L-SIG TXOP protection */
if (htcaps & IEEE80211_HTCAP_LSIGTXOPPROT)
printf(",L-SIG TXOP prot");
if (len < 3) {
printf(">");
return;
}
/* A-MPDU parameters. */
ampdu = data[2];
/* A-MPDU length exponent */
if ((ampdu & IEEE80211_AMPDU_PARAM_LE) >= 0 &&
(ampdu & IEEE80211_AMPDU_PARAM_LE) <= 3)
printf(",A-MPDU max %d",
(1 << (13 + (ampdu & IEEE80211_AMPDU_PARAM_LE))) - 1);
/* A-MPDU start spacing */
if (ampdu & IEEE80211_AMPDU_PARAM_SS) {
float ss;
switch ((ampdu & IEEE80211_AMPDU_PARAM_SS) >> 2) {
case 1:
ss = 0.25;
break;
case 2:
ss = 0.5;
break;
case 3:
ss = 1;
break;
case 4:
ss = 2;
break;
case 5:
ss = 4;
break;
case 6:
ss = 8;
break;
case 7:
ss = 16;
break;
default:
ss = 0;
break;
}
if (ss != 0)
printf(",A-MPDU spacing %.2fus", ss);
}
int
ieee80211_elements(struct ieee80211_frame *wh)
{
u_int8_t *frm;
u_int8_t *tstamp, *bintval, *capinfo;
int i;
frm = (u_int8_t *)&wh[1];
tstamp = frm;
TCHECK2(*tstamp, 8);
frm += 8;
bintval = frm;
TCHECK2(*bintval, 2);
frm += 2;
if (vflag)
PRINTF(", interval %u", letoh16(*(u_int16_t *)bintval));
capinfo = frm;
TCHECK2(*capinfo, 2);
frm += 2;
#if 0
if (vflag)
printb(", caps", letoh16(*(u_int16_t *)capinfo),
IEEE80211_CAPINFO_BITS);
#endif
while (TTEST2(*frm, 2)) {
u_int len = frm[1];
u_int8_t *data = frm + 2;
if (!TTEST2(*data, len))
break;
#define ELEM_CHECK(l) if (len != l) break
switch (*frm) {
case IEEE80211_ELEMID_SSID:
PRINTF(", ssid");
ieee80211_print_essid(data, len);
break;
case IEEE80211_ELEMID_RATES:
if (!vflag)
break;
PRINTF(", rates");
for (i = len; i > 0; i--, data++)
PRINTF(" %uM",
(data[0] & IEEE80211_RATE_VAL) / 2);
break;
case IEEE80211_ELEMID_FHPARMS:
ELEM_CHECK(5);
PRINTF(", fh (dwell %u, chan %u, index %u)",
(data[1] << 8) | data[0],
(data[2] - 1) * 80 + data[3], /* FH_CHAN */
data[4]);
break;
case IEEE80211_ELEMID_DSPARMS:
ELEM_CHECK(1);
if (!vflag)
break;
PRINTF(", ds");
PRINTF(" (chan %u)", data[0]);
break;
case IEEE80211_ELEMID_CFPARMS:
if (!vflag)
break;
PRINTF(", cf");
ieee80211_print_element(data, len);
break;
case IEEE80211_ELEMID_TIM:
if (!vflag)
break;
PRINTF(", tim");
ieee80211_print_element(data, len);
break;
case IEEE80211_ELEMID_IBSSPARMS:
if (!vflag)
break;
PRINTF(", ibss");
ieee80211_print_element(data, len);
break;
case IEEE80211_ELEMID_COUNTRY:
if (!vflag)
break;
PRINTF(", country");
for (i = len; i > 0; i--, data++)
PRINTF(" %u", data[0]);
break;
case IEEE80211_ELEMID_CHALLENGE:
if (!vflag)
break;
PRINTF(", challenge");
ieee80211_print_element(data, len);
break;
case IEEE80211_ELEMID_ERP:
if (!vflag)
break;
PRINTF(", erp");
ieee80211_print_element(data, len);
break;
case IEEE80211_ELEMID_RSN:
if (!vflag)
break;
PRINTF(", rsn");
ieee80211_print_element(data, len);
break;
case IEEE80211_ELEMID_XRATES:
if (!vflag)
break;
PRINTF(", xrates");
for (i = len; i > 0; i--, data++)
PRINTF(" %uM",
(data[0] & IEEE80211_RATE_VAL) / 2);
break;
case IEEE80211_ELEMID_TPC:
if (!vflag)
break;
PRINTF(", tpc");
ieee80211_print_element(data, len);
break;
case IEEE80211_ELEMID_CCKM:
if (!vflag)
break;
PRINTF(", cckm");
ieee80211_print_element(data, len);
break;
case IEEE80211_ELEMID_VENDOR:
if (!vflag)
break;
PRINTF(", vendor");
ieee80211_print_element(data, len);
break;
default:
if (!vflag)
break;
PRINTF(", %u:%u", (u_int) *frm, len);
ieee80211_print_element(data, len);
break;
}
frm += len + 2;
if (frm >= snapend)
break;
}
#undef ELEM_CHECK
return (0);
trunc:
/* Truncated elements in frame */
return (1);
}
