/* packet-ieee80211-prism.c * Routines for Prism monitoring mode header dissection * * Wireshark - Network traffic analyzer * By Gerald Combs * Copyright 1998 Gerald Combs * Copyright (c) 2016, The Linux Foundation. All rights reserved. * Copyright 2016 Cisco Meraki * * Copied from README.developer * * SPDX-License-Identifier: GPL-2.0-or-later * */ #include "config.h" #include #include #include #include #include "packet-ieee80211.h" void proto_register_ieee80211_prism(void); void proto_reg_handoff_ieee80211_prism(void); #define SHORT_STR 256 static dissector_handle_t wlancap_handle; static dissector_handle_t ieee80211_handle; static dissector_handle_t ieee80211_radio_handle; static capture_dissector_handle_t ieee80211_cap_handle; static capture_dissector_handle_t wlancap_cap_handle; static int proto_prism; /* Prism radio header */ static int hf_ieee80211_prism_msgcode; static int hf_ieee80211_prism_msglen; static int hf_ieee80211_prism_devname; static int hf_ieee80211_prism_did; static int hf_ieee80211_prism_did_type; static int hf_ieee80211_prism_did_status; static int hf_ieee80211_prism_did_length; static int hf_ieee80211_prism_did_hosttime; static int hf_ieee80211_prism_did_mactime; static int hf_ieee80211_prism_did_channel; static int hf_ieee80211_prism_did_rssi; static int hf_ieee80211_prism_did_sq; static int hf_ieee80211_prism_did_signal; static int hf_ieee80211_prism_did_noise; static int hf_ieee80211_prism_did_rate; static int hf_ieee80211_prism_did_istx; static int hf_ieee80211_prism_did_frmlen; static int hf_ieee80211_prism_did_unknown; /* Qualcomm Extensions */ static int hf_ieee80211_prism_did_sig_a1; static int hf_ieee80211_prism_did_sig_a2; static int hf_ieee80211_prism_did_sig_b; static int hf_ieee80211_prism_did_sig_rate_field; static gint ett_prism; static gint ett_prism_did; static gint ett_sig_ab; static dissector_handle_t prism_handle; /* * Prism II-based wlan devices have a monitoring mode that sticks * a proprietary header on each packet with lots of good * information. This file is responsible for decoding that * data. * * Support by Tim Newsham * * A value from the header. * * It appears from looking at the linux-wlan-ng and Prism II HostAP * drivers, and various patches to the orinoco_cs drivers to add * Prism headers, that: * * the "did" identifies what the value is (i.e., what it's the value * of); * * "status" is 0 if the value is present or 1 if it's absent; * * "len" is the length of the value (always 4, in that code); * * "data" is the value of the data (or 0 if not present). * * Note: all of those values are in the *host* byte order of the machine * on which the capture was written. */ /* * Header attached during Prism monitor mode. * * At least according to one paper I've seen, the Prism 2.5 chip set * provides: * * RSSI (receive signal strength indication) is "the total power * received by the radio hardware while receiving the frame, * including signal, interfereence, and background noise"; * * "silence value" is "the total power observed just before the * start of the frame". * * None of the drivers I looked at supply the "rssi" or "sq" value, * but they do supply "signal" and "noise" values, along with a "rate" * value that's 1/5 of the raw value from what is presumably a raw * HFA384x frame descriptor, with the comment "set to 802.11 units", * which presumably means the units are 500 Kb/s. * * I infer from the current NetBSD "wi" driver that "signal" and "noise" * are adjusted dBm values, with the dBm value having 100 added to it * for the Prism II cards (although the NetBSD code has an XXX comment * for the #define for WI_PRISM_DBM_OFFSET) and 149 (with no XXX comment) * for the Orinoco cards. * * XXX - what about other drivers that supply Prism headers, such as * old versions of the MadWifi driver? * * I'm not sure where these DID values come from, but they work with * at least one capture file. However, in * * https://ask.wireshark.org/questions/14963/how-to-get-the-field-did-unknown-4041-into-the-column * * somebody reports a capture where *different* DID values, corresponding * to * * http://www.martin.cc/linux/prism * * are used (and that's not a byte-order issue, as those values are *not* * just byte-swapped versions of the other values). */ #define PRISM_HEADER_LENGTH 144 /* Default Prism Header Length */ /* * Message code values. * * Some Prism captures have headers that begin with 0x00000044; those * captures have the non-home.martin.cc values for the DID types, * while a capture with 0x00000041 as the message code have the * home.martin.cc values for the DID types, and the home.martin.cc * page has 0x00000041 as the message code. */ #define PRISM_TYPE1_MSGCODE 0x00000044 /* Monitor Frame */ #define PRISM_TYPE2_MSGCODE 0x00000041 /* * DID codes - PRISM_TYPE1_xxx are the non-home.martin.cc values, and * PRISM_TYPE2_xxx are the home.martin.cc values. */ #define PRISM_TYPE1_HOSTTIME 0x00010044 /* Host time element */ #define PRISM_TYPE2_HOSTTIME 0x00001041 #define PRISM_TYPE1_MACTIME 0x00020044 /* Mac time element */ #define PRISM_TYPE2_MACTIME 0x00002041 #define PRISM_TYPE1_CHANNEL 0x00030044 /* Channel element */ #define PRISM_TYPE2_CHANNEL 0x00003041 #define PRISM_TYPE1_RSSI 0x00040044 /* RSSI element */ #define PRISM_TYPE2_RSSI 0x00004041 #define PRISM_TYPE1_SQ 0x00050044 /* SQ element */ #define PRISM_TYPE2_SQ 0x00005041 #define PRISM_TYPE1_SIGNAL 0x00060044 /* Signal element */ #define PRISM_TYPE2_SIGNAL 0x00006041 #define PRISM_TYPE1_NOISE 0x00070044 /* Noise element */ #define PRISM_TYPE2_NOISE 0x00007041 #define PRISM_TYPE1_RATE 0x00080044 /* Rate element */ #define PRISM_TYPE2_RATE 0x00008041 #define PRISM_TYPE1_ISTX 0x00090044 /* Is Tx frame */ #define PRISM_TYPE2_ISTX 0x00009041 #define PRISM_TYPE1_FRMLEN 0x000A0044 /* Frame length */ #define PRISM_TYPE2_FRMLEN 0x0000A041 /* Qualcomm extensions */ #define PRISM_TYPE1_RATE_SIG_A1 0x000B0044 /* VHT SIGA1 element */ #define PRISM_TYPE2_RATE_SIG_A1 0x0000B044 #define PRISM_TYPE1_RATE_SIG_A2 0x000C0044 /* VHT SIGA2 element */ #define PRISM_TYPE2_RATE_SIG_A2 0x0000C044 #define PRISM_TYPE1_RATE_SIG_B 0x000D0044 /* VHT SIGB element */ #define PRISM_TYPE2_RATE_SIG_B 0x0000D044 /* VHT SIGB element */ static const value_string prism_did_vals[] = { { PRISM_TYPE1_HOSTTIME, "Host Time" }, { PRISM_TYPE2_HOSTTIME, "Host Time" }, { PRISM_TYPE1_MACTIME, "Mac Time" }, { PRISM_TYPE2_MACTIME, "Mac Time" }, { PRISM_TYPE1_CHANNEL, "Channel" }, { PRISM_TYPE2_CHANNEL, "Channel" }, { PRISM_TYPE1_RSSI, "RSSI" }, { PRISM_TYPE2_RSSI, "RSSI" }, { PRISM_TYPE1_SQ, "SQ" }, { PRISM_TYPE2_SQ, "SQ" }, { PRISM_TYPE1_SIGNAL, "Signal" }, { PRISM_TYPE2_SIGNAL, "Signal" }, { PRISM_TYPE1_NOISE, "Noise" }, { PRISM_TYPE2_NOISE, "Noise" }, { PRISM_TYPE1_RATE, "Rate" }, { PRISM_TYPE2_RATE, "Rate" }, { PRISM_TYPE1_ISTX, "Is Tx" }, { PRISM_TYPE2_ISTX, "Is Tx" }, { PRISM_TYPE1_FRMLEN, "Frame Length" }, { PRISM_TYPE2_FRMLEN, "Frame Length" }, /* Qualcomm extensions */ { PRISM_TYPE1_RATE_SIG_A1, "SIG A1" }, { PRISM_TYPE2_RATE_SIG_A1, "SIG A1" }, { PRISM_TYPE1_RATE_SIG_A2, "SIG A2" }, { PRISM_TYPE2_RATE_SIG_A2, "SIG A2" }, { PRISM_TYPE1_RATE_SIG_B, "SIG B" }, { PRISM_TYPE2_RATE_SIG_B, "SIG B" }, { 0, NULL} }; /* * The header file mentioned above says 0 means "supplied" and 1 means * "not supplied". I haven't seen a capture file with anything other * than 0 there, but there is at least one driver that appears to use * 1 for values it doesn't supply (the Linux acx-20080210 driver). */ static const value_string prism_status_vals[] = { { 0, "Supplied" }, { 1, "Not Supplied" }, { 0, NULL} }; static const value_string prism_istx_vals[] = { { 0, "Rx Packet" }, { 1, "Tx Packet" }, { 0, NULL} }; static void prism_rate_base_custom(gchar *result, guint32 rate) { snprintf(result, ITEM_LABEL_LENGTH, "%u.%u", rate /2, rate & 1 ? 5 : 0); } static gchar * prism_rate_return(wmem_allocator_t *scope, guint32 rate) { gchar *result=NULL; result = (gchar *)wmem_alloc(scope, SHORT_STR); result[0] = '\0'; prism_rate_base_custom(result, rate); return result; } /* HT20 Rate table MAX NSS = 4 */ static unsigned int ht_20_tbl[32][2] = { { 65, 72 }, /* MCS 0 */ { 130, 144 }, /* MCS 1 */ { 195, 217 }, /* MCS 2 */ { 260, 289 }, /* MCS 3 */ { 390, 433 }, /* MCS 4 */ { 520, 578 }, /* MCS 5 */ { 585, 650 }, /* MCS 6 */ { 650, 722 }, /* MCS 7 */ { 130, 144 }, /* MCS 8 */ { 260, 289 }, /* MCS 9 */ { 390, 433 }, /* MCS 10 */ { 520, 578 }, /* MCS 11 */ { 780, 867 }, /* MCS 12 */ { 1040, 1156 }, /* MCS 13 */ { 1170, 1300 }, /* MCS 14 */ { 1300, 1444 }, /* MCS 15 */ { 195, 217 }, /* MCS 16 */ { 390, 433 }, /* MCS 17 */ { 585, 650 }, /* MCS 18 */ { 780, 867 }, /* MCS 19 */ { 1170, 1300 }, /* MCS 20 */ { 1560, 1733 }, /* MCS 21 */ { 1755, 1950 }, /* MCS 22 */ { 1950, 2167 }, /* MCS 23 */ { 260, 289 }, /* MCS 24 */ { 520, 578 }, /* MCS 25 */ { 780, 867 }, /* MCS 26 */ { 1040, 1156 }, /* MCS 27 */ { 1560, 1733 }, /* MCS 28 */ { 2080, 2311 }, /* MCS 29 */ { 2340, 2600 }, /* MCS 30 */ { 2600, 2889 } /* MCS 31 */ }; /* HT40 Rate table MAX NSS = 4 */ static unsigned int ht_40_tbl[32][2] = { { 135, 150 }, /* MCS 0 */ { 270, 300 }, /* MCS 1 */ { 405, 450 }, /* MCS 2 */ { 540, 600 }, /* MCS 3 */ { 810, 900 }, /* MCS 4 */ { 1080, 1200 }, /* MCS 5 */ { 1215, 1350 }, /* MCS 6 */ { 1350, 1500 }, /* MCS 7 */ { 270, 300 }, /* MCS 8 */ { 540, 600 }, /* MCS 9 */ { 810, 900 }, /* MCS 10 */ { 1080, 1200 }, /* MCS 11 */ { 1620, 1800 }, /* MCS 12 */ { 2160, 2400 }, /* MCS 13 */ { 2430, 2700 }, /* MCS 14 */ { 2700, 3000 }, /* MCS 15 */ { 405, 450 }, /* MCS 16 */ { 810, 900 }, /* MCS 17 */ { 1215, 1350 }, /* MCS 18 */ { 1620, 1800 }, /* MCS 19 */ { 2430, 2700 }, /* MCS 20 */ { 3240, 3600 }, /* MCS 21 */ { 3645, 4050 }, /* MCS 22 */ { 4050, 4500 }, /* MCS 23 */ { 540, 600 }, /* MCS 24 */ { 1080, 1200 }, /* MCS 25 */ { 1620, 1800 }, /* MCS 26 */ { 2160, 2400 }, /* MCS 27 */ { 3240, 3600 }, /* MCS 28 */ { 4320, 4800 }, /* MCS 29 */ { 4860, 5400 }, /* MCS 30 */ { 5400, 6000 }}; /* MCS 31 */ /* VHT20 Rate Table MAX NSS = 4 */ static unsigned int vht_20_tbl[10][8] = { { 65, 72, 130, 144, 195, 217, 260, 289}, /* MCS 0 */ { 130, 144, 260, 289, 390, 433, 520, 578}, /* MCS 1 */ { 195, 217, 390, 433, 585, 650, 780, 867}, /* MCS 2 */ { 260, 289, 520, 578, 780, 867, 1040, 1156}, /* MCS 3 */ { 390, 433, 780, 867, 1170, 1300, 1560, 1733}, /* MCS 4 */ { 520, 578, 1040, 1156, 1560, 1733, 2080, 2311}, /* MCS 5 */ { 585, 650, 1170, 1300, 1755, 1950, 2340, 2600}, /* MCS 6 */ { 650, 722, 1300, 1444, 1950, 2167, 2600, 2889}, /* MCS 7 */ { 780, 867, 1560, 1733, 2340, 2600, 3120, 3467}, /* MCS 8 */ { 0, 0, 0, 0, 2600, 2889, 0, 0} /* MCS 9 */ }; /* VHT40 Rate Table MAX NSS = 4 */ static unsigned int vht_40_tbl[10][8] = { { 135, 150, 270, 300, 405, 450, 540, 600}, /* MCS 0 */ { 270, 300, 540, 600, 810, 900, 1080, 1200}, /* MCS 1 */ { 405, 450, 810, 900, 1215, 1350, 1620, 1800}, /* MCS 2 */ { 540, 600, 1080, 1200, 1620, 1800, 2160, 2400}, /* MCS 3 */ { 810, 900, 1620, 1800, 2430, 2700, 3240, 3600}, /* MCS 4 */ { 1080, 1200, 2160, 2400, 3240, 3600, 4320, 4800}, /* MCS 5 */ { 1215, 1350, 2430, 2700, 3645, 4050, 4860, 5400}, /* MCS 6 */ { 1350, 1500, 2700, 3000, 4050, 4500, 5400, 6000}, /* MCS 7 */ { 1620, 1800, 3240, 3600, 4860, 5400, 6480, 7200}, /* MCS 8 */ { 1800, 2000, 3600, 4000, 5400, 6000, 7200, 8000} /* MCS 9 */ }; /* VHT80 Rate Table MAX NSS = 4 */ static unsigned int vht_80_tbl[10][8] = { { 293, 325, 585, 650, 878, 975, 1170, 1300}, /* MCS 0 */ { 585, 650, 1170, 1300, 1755, 1950, 2340, 2600}, /* MCS 1 */ { 878, 975, 1755, 1950, 2633, 2925, 3510, 3900}, /* MCS 2 */ { 1170, 1300, 2340, 2600, 3510, 3900, 4680, 5200}, /* MCS 3 */ { 1755, 1950, 3510, 3900, 5265, 5850, 7020, 7800}, /* MCS 4 */ { 2340, 2600, 4680, 5200, 7020, 7800, 9360, 10400}, /* MCS 5 */ { 2633, 2925, 5265, 5850, 0, 0, 10530, 11700}, /* MCS 6 */ { 2925, 3250, 5850, 6500, 8775, 9750, 11700, 13000}, /* MCS 7 */ { 3510, 3900, 7020, 7800, 10530, 11700, 14040, 15600}, /* MCS 8 */ { 3900, 4333, 7800, 8667, 11700, 13000, 15600, 17333} /* MCS 9 */ }; /* VHT160 Rate Table MAX NSS = 4 */ static unsigned int vht_160_tbl[10][8] = { { 585, 650, 1170, 1300, 1755, 1950, 2340, 2600}, /* MCS 0 */ { 1170, 1300, 2340, 2600, 3510, 3900, 4680, 5200}, /* MCS 1 */ { 1755, 1950, 3510, 3900, 5265, 5850, 7020, 7800}, /* MCS 2 */ { 2340, 2600, 4680, 5200, 7020, 7800, 9360, 10400}, /* MCS 3 */ { 3510, 3900, 7020, 7800, 10530, 11700, 14040, 15600}, /* MCS 4 */ { 4680, 5200, 9360, 10400, 14040, 15600, 18720, 20800}, /* MCS 5 */ { 5265, 5850, 10530, 11700, 15795, 17550, 21060, 23400}, /* MCS 6 */ { 5850, 6500, 11700, 13000, 17550, 19500, 23400, 26000}, /* MCS 7 */ { 7020, 7800, 14040, 15600, 21060, 23400, 28080, 31200}, /* MCS 8 */ { 7800, 8667, 15600, 17333, 0, 0, 31200, 34667} /* MCS 9 */ }; static gchar * prism_rate_return_sig(wmem_allocator_t *scope, guint32 rate_phy1, guint32 rate_phy2, struct ieee_802_11_phdr *phdr) { gchar *result = NULL; unsigned int mcs, base, pream_type, disp_rate, bw, sgi, ldpc, stbc, groupid, txbf; gboolean su_ppdu = FALSE; unsigned int partial_aid, nsts_u1, nsts_u2, nsts_u3, nsts_u4; unsigned int sig_a_1, sig_a_2, nss = 1, nsts_su, signal_type; unsigned int dsss_tbl[] = {22, 11, 4, 2}; static const unsigned int bw_map[] = { 0, 1, 4, 11 }; /* * Qualcomm Atheros: Display Nss, MCS/Rate, BW, sgi, LDPC, STBC info */ pream_type = rate_phy1 & 0xF; switch (pream_type) { case 0: /* OFDM */ phdr->phy = PHDR_802_11_PHY_11A; /* or 11g? */ mcs = (rate_phy1 >> 4) & 0xF; base = (mcs & 0x4) ? 9 : 6; mcs &= ~0x4; mcs = base << (11 - mcs); mcs = (mcs > 54) ? 54 : mcs; phdr->has_data_rate = 1; phdr->data_rate = mcs * 2; signal_type = rate_phy1 & (1 << 12); bw = 20 << ((rate_phy1 >> 13) & 0x3); result = wmem_strdup_printf(scope, "Rate: %u.%u Mb/s OFDM Signaling:%s BW %d", mcs, 0, signal_type ? "Dynamic" : "Static", bw ); break; case 1: /* DSSS */ phdr->phy = PHDR_802_11_PHY_11B; mcs = (rate_phy1 >> 4) & 0xF; base = (mcs & 0x4) ? 1 : 0; phdr->phy_info.info_11b.has_short_preamble = 1; phdr->phy_info.info_11b.short_preamble = base; mcs &= ~0x4; mcs = (mcs - 8) & 0x3; disp_rate = dsss_tbl[mcs]; phdr->has_data_rate = 1; phdr->data_rate = disp_rate; result = wmem_strdup_printf(scope, "Rate: %u.%u Mb/s DSSS %s", disp_rate / 2, (disp_rate & 1) ? 5 : 0, base ? "[SP]" : "[LP]"); break; case 2: /* HT */ phdr->phy = PHDR_802_11_PHY_11N; sig_a_1 = (rate_phy1 >> 4) & 0xFFFF; sig_a_2 = (rate_phy2) & 0xFFF; mcs = sig_a_1 & 0x7f; phdr->phy_info.info_11n.has_mcs_index = 1; phdr->phy_info.info_11n.mcs_index = mcs; bw = 20 << ((sig_a_1 >> 7) & 1); phdr->phy_info.info_11n.has_bandwidth = 1; phdr->phy_info.info_11n.bandwidth = ((sig_a_1 >> 7) & 1); sgi = (sig_a_2 >> 7) & 1; phdr->phy_info.info_11n.has_short_gi = 1; phdr->phy_info.info_11n.short_gi = sgi; ldpc = (sig_a_2 >> 6) & 1; phdr->phy_info.info_11n.has_fec = 1; phdr->phy_info.info_11n.fec = ldpc; stbc = ((sig_a_2 >> 4) & 3)?1:0; phdr->phy_info.info_11n.has_stbc_streams = 1; phdr->phy_info.info_11n.stbc_streams = stbc; phdr->phy_info.info_11n.has_ness = 1; phdr->phy_info.info_11n.ness = (sig_a_2 >> 8) & 3; nss = (mcs >> 3) + 1; /* Check limits */ disp_rate = 0; if ((nss <= 4) && (mcs <= 31) && ((bw == 20) || (bw==40))){ switch (bw) { case 20: if (sgi) { disp_rate = ht_20_tbl[mcs][1]; } else { disp_rate = ht_20_tbl[mcs][0]; } break; case 40: if (sgi) { disp_rate = ht_40_tbl[mcs][1]; } else { disp_rate = ht_40_tbl[mcs][0]; } break; } } result = wmem_strdup_printf(scope, "Rate: %u.%u Mb/s HT MCS %d NSS %d BW %d MHz %s %s %s", disp_rate/10, disp_rate%10, mcs, nss, bw, sgi ? "[SGI]" : "", ldpc ? "[LDPC]" : "", stbc ? "[STBC]" : ""); break; case 3: /* VHT */ phdr->phy = PHDR_802_11_PHY_11AC; sig_a_1 = (rate_phy1 >> 4) & 0xFFFFFF; sig_a_2 = (rate_phy2) & 0xFFFFFF; stbc = (sig_a_1 >> 3) & 1; phdr->phy_info.info_11ac.has_stbc = 1; phdr->phy_info.info_11ac.stbc = stbc; sgi = sig_a_2 & 1; phdr->phy_info.info_11ac.has_short_gi = 1; phdr->phy_info.info_11ac.short_gi = sgi; bw = 20 << (sig_a_1 & 3); phdr->phy_info.info_11ac.has_bandwidth = 1; phdr->phy_info.info_11ac.bandwidth = bw_map[(sig_a_1 & 3)]; ldpc = (sig_a_2 >> 2) & 1; phdr->phy_info.info_11ac.has_fec = 1; phdr->phy_info.info_11ac.fec = ldpc; groupid = (sig_a_1 >> 4) & 0x3F; phdr->phy_info.info_11ac.has_group_id = 1; phdr->phy_info.info_11ac.group_id = groupid; if (groupid == 0 || groupid == 63) su_ppdu = TRUE; disp_rate = 0; if (su_ppdu) { nsts_su = (sig_a_1 >> 10) & 0x7; if (stbc) nss = nsts_su >> 2; else nss = nsts_su; ++nss; mcs = (sig_a_2 >> 4) & 0xF; phdr->phy_info.info_11ac.mcs[0] = mcs; phdr->phy_info.info_11ac.nss[0] = nss; txbf = (sig_a_2 >> 8) & 1; phdr->phy_info.info_11ac.has_beamformed = 1; phdr->phy_info.info_11ac.beamformed = txbf; partial_aid = (sig_a_1 >> 13) & 0x1FF; phdr->phy_info.info_11ac.has_partial_aid = 1; phdr->phy_info.info_11ac.partial_aid = partial_aid; /* Check limits */ if ((nss <= 4) && (mcs <= 9) && ((bw == 20) || (bw==40) || (bw==80) || bw==160)) { switch (bw) { case 20: if (sgi) { disp_rate = vht_20_tbl[mcs][(nss * 2) - 1]; } else { disp_rate = vht_20_tbl[mcs][(nss - 1) * 2]; } break; case 40: if (sgi) { disp_rate = vht_40_tbl[mcs][(nss * 2) - 1]; } else { disp_rate = vht_40_tbl[mcs][(nss - 1) * 2]; } break; case 80: if (sgi) { disp_rate = vht_80_tbl[mcs][(nss * 2) - 1]; } else { disp_rate = vht_80_tbl[mcs][(nss - 1) * 2]; } break; case 160: if (sgi) { disp_rate = vht_160_tbl[mcs][(nss * 2) - 1]; } else { disp_rate = vht_160_tbl[mcs][(nss - 1) * 2]; } break; } } result = wmem_strdup_printf(scope, "Rate: %u.%u Mb/s VHT MCS %d NSS %d Partial AID %d BW %d MHz %s %s %s GroupID %d %s %s", disp_rate/10, disp_rate%10, mcs, nss, partial_aid, bw, sgi ? "[SGI]" : "", ldpc ? "[LDPC]" : "", stbc ? "[STBC]" : "", groupid, "[SU_PPDU]", txbf ? "[TxBF]" : ""); } else { nsts_u1 = (sig_a_1 >> 10) & 0x7; nsts_u2 = (sig_a_1 >> 13) & 0x7; nsts_u3 = (sig_a_1 >> 16) & 0x7; nsts_u4 = (sig_a_1 >> 19) & 0x7; result = wmem_strdup_printf(scope, "VHT NSTS %d %d %d %d BW %d MHz %s %s %s GroupID %d %s", nsts_u1, nsts_u2, nsts_u3, nsts_u4, bw, sgi ? "[SGI]" : "", ldpc ? "[LDPC]" : "", stbc ? "[STBC]" : "", groupid, "[MU_PPDU]"); } break; } return result; } static gboolean capture_prism(const guchar *pd, int offset, int len, capture_packet_info_t *cpinfo, const union wtap_pseudo_header *pseudo_header _U_) { guint32 cookie; if (!BYTES_ARE_IN_FRAME(offset, len, 4)) return FALSE; /* Some captures with DLT_PRISM have the AVS WLAN header */ cookie = pntoh32(pd); if ((cookie == WLANCAP_MAGIC_COOKIE_V1) || (cookie == WLANCAP_MAGIC_COOKIE_V2)) { return call_capture_dissector(wlancap_cap_handle, pd, offset, len, cpinfo, pseudo_header); } /* Prism header */ if (!BYTES_ARE_IN_FRAME(offset, len, PRISM_HEADER_LENGTH)) return FALSE; offset += PRISM_HEADER_LENGTH; /* 802.11 header follows */ return call_capture_dissector(ieee80211_cap_handle, pd, offset, len, cpinfo, pseudo_header); } static int dissect_prism(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_) { proto_tree *prism_tree, *prism_did_tree = NULL; proto_item *ti = NULL, *ti_did = NULL; tvbuff_t *next_tvb; int offset; guint32 msgcode, msglen, did, rate_phy1 = 0, rate_phy2 = 0; guint byte_order; guint16 status; const guint8 *devname_p; guint32 mactime; guint32 channel; guint32 signal_dbm; guint32 rate; struct ieee_802_11_phdr phdr; offset = 0; did = 0; /* handle the AVS header */ msgcode = tvb_get_ntohl(tvb, offset); if ((msgcode == WLANCAP_MAGIC_COOKIE_V1) || (msgcode == WLANCAP_MAGIC_COOKIE_V2)) { call_dissector(wlancap_handle, tvb, pinfo, tree); return tvb_captured_length(tvb); } /* * If we don't see a valid message type, assume the Prism or AVS * header was omitted and just hand off to the 802.11 dissector; * at least one capture has AVS headers on some packets and no * radio headers on others (incoming vs. outgoing?). * * Check for both byte orders and use that to determine * the byte order of the fields in the Prism header. */ if ((msgcode == PRISM_TYPE1_MSGCODE) || (msgcode == PRISM_TYPE2_MSGCODE)) { /* big-endian fetch matched */ byte_order = ENC_BIG_ENDIAN; } else if (((msgcode = tvb_get_letohl(tvb, offset)) == PRISM_TYPE1_MSGCODE) || (msgcode == PRISM_TYPE2_MSGCODE)) { /* little-endian fetch matched */ byte_order = ENC_LITTLE_ENDIAN; } else { /* neither matched - try it as just 802.11 with no Prism header */ call_dissector(ieee80211_handle, tvb, pinfo, tree); return tvb_captured_length(tvb); } /* We don't have any 802.11 metadata yet. */ memset(&phdr, 0, sizeof(phdr)); phdr.fcs_len = -1; phdr.decrypted = FALSE; phdr.datapad = FALSE; phdr.phy = PHDR_802_11_PHY_UNKNOWN; col_set_str(pinfo->cinfo, COL_PROTOCOL, "Prism"); col_clear(pinfo->cinfo, COL_INFO); ti = proto_tree_add_item(tree, proto_prism, tvb, 0, 144, ENC_NA); prism_tree = proto_item_add_subtree(ti, ett_prism); /* Message Code */ proto_tree_add_item_ret_uint(prism_tree, hf_ieee80211_prism_msgcode, tvb, offset, 4, byte_order, &msgcode); offset += 4; /* Message Length */ proto_tree_add_item_ret_uint(prism_tree, hf_ieee80211_prism_msglen, tvb, offset, 4, byte_order, &msglen); offset += 4; /* Device Name */ proto_tree_add_item_ret_string(prism_tree, hf_ieee80211_prism_devname, tvb, offset, 16, ENC_ASCII|ENC_NA, pinfo->pool, &devname_p); offset += 16; col_add_fstr(pinfo->cinfo, COL_INFO, "Device: %s, Message 0x%x, Length %d", devname_p, msgcode, msglen); while (offset < PRISM_HEADER_LENGTH) { /* DID */ if (tree) { ti_did = proto_tree_add_item(prism_tree, hf_ieee80211_prism_did, tvb, offset, 12, ENC_NA); prism_did_tree = proto_item_add_subtree(ti_did, ett_prism_did); proto_tree_add_item(prism_did_tree, hf_ieee80211_prism_did_type, tvb, offset, 4, byte_order); did = tvb_get_guint32(tvb, offset, byte_order); proto_item_append_text(ti_did, " %s", val_to_str(did, prism_did_vals, "Unknown %x") ); } offset += 4; /* Status */ status = tvb_get_guint16(tvb, offset, byte_order); proto_tree_add_item(prism_did_tree, hf_ieee80211_prism_did_status, tvb, offset, 2, byte_order); offset += 2; /* Length */ proto_tree_add_item(prism_did_tree, hf_ieee80211_prism_did_length, tvb, offset, 2, byte_order); offset += 2; /* Data, if present... */ if (status == 0) { switch (did) { case PRISM_TYPE1_HOSTTIME: case PRISM_TYPE2_HOSTTIME: if (tree) { proto_tree_add_item(prism_did_tree, hf_ieee80211_prism_did_hosttime, tvb, offset, 4, byte_order); proto_item_append_text(ti_did, " %d", tvb_get_guint32(tvb, offset, byte_order) ); } break; case PRISM_TYPE1_MACTIME: case PRISM_TYPE2_MACTIME: mactime = tvb_get_guint32(tvb, offset, byte_order); phdr.has_tsf_timestamp = 1; phdr.tsf_timestamp = mactime; if (tree) { proto_tree_add_item(prism_did_tree, hf_ieee80211_prism_did_mactime, tvb, offset, 4, byte_order); proto_item_append_text(ti_did, " %d", mactime ); } break; case PRISM_TYPE1_CHANNEL: case PRISM_TYPE2_CHANNEL: channel = tvb_get_guint32(tvb, offset, byte_order); phdr.has_channel = TRUE; phdr.channel = channel; if (tree) { proto_tree_add_item(prism_did_tree, hf_ieee80211_prism_did_channel, tvb, offset, 4, byte_order); proto_item_append_text(ti_did, " %u", channel); } col_add_fstr(pinfo->cinfo, COL_FREQ_CHAN, "%u", channel); break; case PRISM_TYPE1_RSSI: case PRISM_TYPE2_RSSI: signal_dbm = tvb_get_guint32(tvb, offset, byte_order); phdr.has_signal_dbm = 1; phdr.signal_dbm = signal_dbm; if (tree) { proto_tree_add_item(prism_did_tree, hf_ieee80211_prism_did_rssi, tvb, offset, 4, byte_order); proto_item_append_text(ti_did, " %d", signal_dbm ); } col_add_fstr(pinfo->cinfo, COL_RSSI, "%d", signal_dbm); break; case PRISM_TYPE1_SQ: case PRISM_TYPE2_SQ: if (tree) { proto_tree_add_item(prism_did_tree, hf_ieee80211_prism_did_sq, tvb, offset, 4, byte_order); proto_item_append_text(ti_did, " 0x%x", tvb_get_guint32(tvb, offset, byte_order) ); } break; case PRISM_TYPE1_SIGNAL: case PRISM_TYPE2_SIGNAL: if (tree) { proto_tree_add_item(prism_did_tree, hf_ieee80211_prism_did_signal, tvb, offset, 4, byte_order); proto_item_append_text(ti_did, " 0x%x", tvb_get_guint32(tvb, offset, byte_order) ); } break; case PRISM_TYPE1_NOISE: case PRISM_TYPE2_NOISE: if (tree) { proto_tree_add_item(prism_did_tree, hf_ieee80211_prism_did_noise, tvb, offset, 4, byte_order); proto_item_append_text(ti_did, " 0x%x", tvb_get_guint32(tvb, offset, byte_order) ); } break; case PRISM_TYPE1_RATE: case PRISM_TYPE2_RATE: rate = tvb_get_guint32(tvb, offset, byte_order); phdr.has_data_rate = TRUE; phdr.data_rate = rate; if (tree) { proto_tree_add_item(prism_did_tree, hf_ieee80211_prism_did_rate, tvb, offset, 4, byte_order); proto_item_append_text(ti_did, " %s Mb/s", prism_rate_return(pinfo->pool, rate)); } col_add_fstr(pinfo->cinfo, COL_TX_RATE, "%s", prism_rate_return(pinfo->pool, rate)); break; case PRISM_TYPE1_RATE_SIG_A1: case PRISM_TYPE2_RATE_SIG_A1: /* * XXX - always little-endian, or same byte order as the * rest of the Prism header? */ rate_phy1 = tvb_get_letohl(tvb, offset); if (tree) { proto_tree_add_item(prism_did_tree, hf_ieee80211_prism_did_sig_a1, tvb, offset, 4, byte_order); proto_item_append_text(ti_did, " 0x%x", tvb_get_letohl(tvb, offset)); } break; case PRISM_TYPE1_RATE_SIG_A2: case PRISM_TYPE2_RATE_SIG_A2: /* * XXX - always little-endian, or same byte order as the * rest of the Prism header? */ rate_phy2 = tvb_get_letohl(tvb, offset); if (tree) { proto_tree_add_item(prism_did_tree, hf_ieee80211_prism_did_sig_a2, tvb, offset, 4, byte_order); proto_item_append_text(ti_did, " 0x%x", tvb_get_letohl(tvb, offset)); } break; case PRISM_TYPE1_RATE_SIG_B: case PRISM_TYPE2_RATE_SIG_B: if (tree && rate_phy1 && rate_phy2) { proto_item *sig_sub_item; proto_tree_add_item(prism_did_tree, hf_ieee80211_prism_did_sig_b, tvb, offset, 4, byte_order); proto_item_append_text(ti_did, " 0x%x", tvb_get_letohl(tvb, offset)); sig_sub_item = proto_tree_add_item(prism_tree, hf_ieee80211_prism_did_sig_rate_field, tvb, offset, 4, byte_order); proto_item_append_text(sig_sub_item, " %s", prism_rate_return_sig(pinfo->pool, rate_phy1, rate_phy2, &phdr)); } break; case PRISM_TYPE1_ISTX: case PRISM_TYPE2_ISTX: if (tree) { proto_tree_add_item(prism_did_tree, hf_ieee80211_prism_did_istx, tvb, offset, 4, byte_order); proto_item_append_text(ti_did, " 0x%x", tvb_get_guint32(tvb, offset, byte_order) ); } break; case PRISM_TYPE1_FRMLEN: case PRISM_TYPE2_FRMLEN: if (tree) { proto_tree_add_item(prism_did_tree, hf_ieee80211_prism_did_frmlen, tvb, offset, 4, byte_order); proto_item_append_text(ti_did, " %d", tvb_get_guint32(tvb, offset, byte_order)); } break; default: proto_tree_add_item(prism_did_tree, hf_ieee80211_prism_did_unknown, tvb, offset, 4, byte_order); break; } } offset += 4; } /* * The only DIDs that directly indicate the packet modulation * are the SIG_A1 and SIG_A2 DIDs; if they're not present, we * ned to use some other way to determine the packet modulation, * so, if the modulation is unknown at this point: * * if the data rate is 1 Mb/s or 2 Mb/s, the packet was * transmitted using the 802.11 legacy DSSS modulation * (we ignore the IR PHY - was it ever implemented?); * * if the data rate is 5 Mb/s or 11 Mb/s, the packet * was transmitted using the 802.11b DSSS/CCK modulation * (or the now-obsolete DSSS/PBCC modulation; *if* we can * rely on the channel/xchannel field's "CCK channel" and * "Dynamic CCK-OFDM channel" flags, the absence of either * flag would presumably indicate DSSS/PBCC); * * if the data rate is 22 Mb/s or 33 Mb/s, the packet was * transmitted using the 802.11b DSSS/PBCC modulation (as * those speeds aren't supported by DSSS/CCK); * * if the data rate is one of the OFDM rates for the 11a * OFDM PHY and the OFDM part of the 11g ERP PHY, the * packet was transmitted with the 11g/11a OFDM modulation - * we distinguish between them based on the channel, if we * have it. * * In addition, if they *are* present, and indicate that the * modulation uses OFDM and isn't HT, VHT, or HE, all we know * from that is that it's 11a or 11g, not which of those it * is. We use the channel to distinguish between them. */ if (phdr.has_data_rate) { if (phdr.phy == PHDR_802_11_PHY_UNKNOWN) { /* * We don't know they PHY, but we do have the * data rate; try to guess it based on the * data rate and center frequency. */ if (RATE_IS_DSSS(phdr.data_rate)) { /* 11b */ phdr.phy = PHDR_802_11_PHY_11B; } else if (RATE_IS_OFDM(phdr.data_rate)) { /* 11a or 11g, depending on the band. */ if (phdr.has_channel) { if (CHAN_IS_BG(phdr.channel)) { /* 11g */ phdr.phy = PHDR_802_11_PHY_11G; } else { /* 11a */ phdr.phy = PHDR_802_11_PHY_11A; } } } } else if (phdr.phy == PHDR_802_11_PHY_11A) { /* * All we know is that it's OFDM; we guessed * 11a in prism_rate_return_sig(), but if * the channel is 2.4 GHz channel, it's * 11g. */ if (phdr.has_channel) { if (CHAN_IS_BG(phdr.channel)) { /* 11g */ phdr.phy = PHDR_802_11_PHY_11G; } } if (RATE_IS_DSSS(phdr.data_rate)) { /* DSSS, so 11b. */ phdr.phy = PHDR_802_11_PHY_11B; } } } /* dissect the 802.11 header next */ next_tvb = tvb_new_subset_remaining(tvb, offset); call_dissector_with_data(ieee80211_radio_handle, next_tvb, pinfo, tree, (void *)&phdr); return tvb_captured_length(tvb); } static hf_register_info hf_prism[] = { /* Prism-specific header fields XXX - make as many of these generic as possible. */ { &hf_ieee80211_prism_msgcode, {"Message Code", "prism.msgcode", FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL }}, { &hf_ieee80211_prism_msglen, {"Message Length", "prism.msglen", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }}, { &hf_ieee80211_prism_devname, {"Device Name", "prism.devname", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }}, { &hf_ieee80211_prism_did, {"DID", "prism.did", FT_NONE, BASE_NONE, NULL, 0x0, NULL, HFILL }}, { &hf_ieee80211_prism_did_type, {"DID", "prism.did.type", FT_UINT32, BASE_HEX, VALS(prism_did_vals), 0x0, "Different ID for each parameter", HFILL }}, { &hf_ieee80211_prism_did_status, {"Status", "prism.did.status", FT_UINT16, BASE_DEC, VALS(prism_status_vals), 0x0, "Supplied by the driver or not", HFILL }}, { &hf_ieee80211_prism_did_length, {"Length", "prism.did.length", FT_UINT16, BASE_DEC, NULL, 0x0, "Length of data", HFILL }}, { &hf_ieee80211_prism_did_hosttime, {"Host Time", "prism.did.hosttime", FT_UINT32, BASE_DEC, NULL, 0x0, "In jiffies - for our system this is in 10ms units", HFILL }}, { &hf_ieee80211_prism_did_mactime, {"MAC timestamp (lower 32 bits)", "prism.did.mactime", FT_UINT32, BASE_DEC, NULL, 0x0, "Lower 32 bits of value in microseconds of the MAC's Time Synchronization Function timer when the first bit of the MPDU arrived at the MAC.", HFILL }}, { &hf_ieee80211_prism_did_channel, {"Channel", "prism.did.channel", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }}, { &hf_ieee80211_prism_did_rssi, {"RSSI", "prism.did.rssi", FT_INT32, BASE_DEC, NULL, 0x0, NULL, HFILL }}, { &hf_ieee80211_prism_did_sq, {"Signal Quality", "prism.did.sq", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }}, { &hf_ieee80211_prism_did_signal, {"Signal", "prism.did.signal", FT_INT32, BASE_DEC, NULL, 0x0, NULL, HFILL }}, { &hf_ieee80211_prism_did_noise, {"Noise", "prism.did.noise", FT_INT32, BASE_DEC, NULL, 0x0, NULL, HFILL }}, { &hf_ieee80211_prism_did_rate, {"Data rate (Mb/s)", "prism.did.rate", FT_UINT32, BASE_CUSTOM, CF_FUNC(prism_rate_base_custom), 0x0, "Speed this frame was sent/received at", HFILL }}, { &hf_ieee80211_prism_did_sig_a1, {"SIG_A1", "prism.did.siga1", FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL }}, { &hf_ieee80211_prism_did_sig_a2, {"SIG_A2", "prism.did.siga2", FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL }}, { &hf_ieee80211_prism_did_sig_b, {"SIG", "prism.did.sigb", FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL}}, { &hf_ieee80211_prism_did_sig_rate_field, {"SIG Field", "prism.did.sigab", FT_NONE, BASE_NONE, 0, 0x0, NULL, HFILL}}, { &hf_ieee80211_prism_did_istx, {"IsTX", "prism.did.istx", FT_UINT32, BASE_HEX, VALS(prism_istx_vals), 0x0, "Type of packet (RX or TX?)", HFILL }}, { &hf_ieee80211_prism_did_frmlen, {"Frame Length", "prism.did.frmlen", FT_UINT32, BASE_DEC, NULL, 0x0, "Length of the following frame in bytes", HFILL }}, { &hf_ieee80211_prism_did_unknown, {"Unknown DID Field", "prism.did.unknown", FT_UINT32, BASE_HEX_DEC, NULL, 0x0, NULL, HFILL }} }; static gint *tree_array[] = { &ett_prism, &ett_prism_did, &ett_sig_ab }; void proto_register_ieee80211_prism(void) { proto_prism = proto_register_protocol("Prism capture header", "Prism", "prism"); proto_register_field_array(proto_prism, hf_prism, array_length(hf_prism)); proto_register_subtree_array(tree_array, array_length(tree_array)); prism_handle = register_dissector("prism", dissect_prism, proto_prism); } void proto_reg_handoff_ieee80211_prism(void) { capture_dissector_handle_t ieee80211_prism_cap_handle; dissector_add_uint("wtap_encap", WTAP_ENCAP_IEEE_802_11_PRISM, prism_handle); ieee80211_handle = find_dissector_add_dependency("wlan", proto_prism); ieee80211_radio_handle = find_dissector_add_dependency("wlan_radio", proto_prism); wlancap_handle = find_dissector_add_dependency("wlancap", proto_prism); ieee80211_prism_cap_handle = create_capture_dissector_handle(capture_prism, proto_prism); capture_dissector_add_uint("wtap_encap", WTAP_ENCAP_IEEE_802_11_PRISM, ieee80211_prism_cap_handle); ieee80211_cap_handle = find_capture_dissector("ieee80211"); wlancap_cap_handle = find_capture_dissector("wlancap"); } /* * Editor modelines * * Local Variables: * c-basic-offset: 4 * tab-width: 8 * indent-tabs-mode: nil * End: * * ex: set shiftwidth=4 tabstop=8 expandtab: * :indentSize=4:tabSize=8:noTabs=true: */