/** * Functions implementing wlan scan IOCTL and firmware command APIs * * IOCTL handlers as well as command preperation and response routines * for sending scan commands to the firmware. */ #include #include #include #include #include #include #include "host.h" #include "decl.h" #include "dev.h" #include "scan.h" //! Approximate amount of data needed to pass a scan result back to iwlist #define MAX_SCAN_CELL_SIZE (IW_EV_ADDR_LEN \ + IW_ESSID_MAX_SIZE \ + IW_EV_UINT_LEN \ + IW_EV_FREQ_LEN \ + IW_EV_QUAL_LEN \ + IW_ESSID_MAX_SIZE \ + IW_EV_PARAM_LEN \ + 40) /* 40 for WPAIE */ //! Memory needed to store a max sized channel List TLV for a firmware scan #define CHAN_TLV_MAX_SIZE (sizeof(struct mrvlietypesheader) \ + (MRVDRV_MAX_CHANNELS_PER_SCAN \ * sizeof(struct chanscanparamset))) //! Memory needed to store a max number/size SSID TLV for a firmware scan #define SSID_TLV_MAX_SIZE (1 * sizeof(struct mrvlietypes_ssidparamset)) //! Maximum memory needed for a wlan_scan_cmd_config with all TLVs at max #define MAX_SCAN_CFG_ALLOC (sizeof(struct wlan_scan_cmd_config) \ + sizeof(struct mrvlietypes_numprobes) \ + CHAN_TLV_MAX_SIZE \ + SSID_TLV_MAX_SIZE) //! The maximum number of channels the firmware can scan per command #define MRVDRV_MAX_CHANNELS_PER_SCAN 14 /** * @brief Number of channels to scan per firmware scan command issuance. * * Number restricted to prevent hitting the limit on the amount of scan data * returned in a single firmware scan command. */ #define MRVDRV_CHANNELS_PER_SCAN_CMD 4 //! Scan time specified in the channel TLV for each channel for passive scans #define MRVDRV_PASSIVE_SCAN_CHAN_TIME 100 //! Scan time specified in the channel TLV for each channel for active scans #define MRVDRV_ACTIVE_SCAN_CHAN_TIME 100 //! Macro to enable/disable SSID checking before storing a scan table #ifdef DISCARD_BAD_SSID #define CHECK_SSID_IS_VALID(x) ssid_valid(&bssidEntry.ssid) #else #define CHECK_SSID_IS_VALID(x) 1 #endif /** * @brief Check if a scanned network compatible with the driver settings * * WEP WPA WPA2 ad-hoc encrypt Network * enabled enabled enabled AES mode privacy WPA WPA2 Compatible * 0 0 0 0 NONE 0 0 0 yes No security * 1 0 0 0 NONE 1 0 0 yes Static WEP * 0 1 0 0 x 1x 1 x yes WPA * 0 0 1 0 x 1x x 1 yes WPA2 * 0 0 0 1 NONE 1 0 0 yes Ad-hoc AES * 0 0 0 0 !=NONE 1 0 0 yes Dynamic WEP * * * @param adapter A pointer to wlan_adapter * @param index Index in scantable to check against current driver settings * @param mode Network mode: Infrastructure or IBSS * * @return Index in scantable, or error code if negative */ static int is_network_compatible(wlan_adapter * adapter, int index, int mode) { ENTER(); if (adapter->scantable[index].inframode == mode) { if (adapter->secinfo.WEPstatus == wlan802_11WEPdisabled && !adapter->secinfo.WPAenabled && !adapter->secinfo.WPA2enabled && adapter->scantable[index].wpa_ie[0] != WPA_IE && adapter->scantable[index].rsn_ie[0] != WPA2_IE && !adapter->scantable[index].privacy) { /* no security */ LEAVE(); return index; } else if (adapter->secinfo.WEPstatus == wlan802_11WEPenabled && !adapter->secinfo.WPAenabled && !adapter->secinfo.WPA2enabled && adapter->scantable[index].privacy) { /* static WEP enabled */ LEAVE(); return index; } else if (adapter->secinfo.WEPstatus == wlan802_11WEPdisabled && adapter->secinfo.WPAenabled && !adapter->secinfo.WPA2enabled && (adapter->scantable[index].wpa_ie[0] == WPA_IE) /* privacy bit may NOT be set in some APs like LinkSys WRT54G && adapter->scantable[index].privacy */ ) { /* WPA enabled */ lbs_pr_debug(1, "is_network_compatible() WPA: index=%d wpa_ie=%#x " "wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s " "privacy=%#x\n", index, adapter->scantable[index].wpa_ie[0], adapter->scantable[index].rsn_ie[0], (adapter->secinfo.WEPstatus == wlan802_11WEPenabled) ? "e" : "d", (adapter->secinfo.WPAenabled) ? "e" : "d", (adapter->secinfo.WPA2enabled) ? "e" : "d", adapter->scantable[index].privacy); LEAVE(); return index; } else if (adapter->secinfo.WEPstatus == wlan802_11WEPdisabled && !adapter->secinfo.WPAenabled && adapter->secinfo.WPA2enabled && (adapter->scantable[index].rsn_ie[0] == WPA2_IE) /* privacy bit may NOT be set in some APs like LinkSys WRT54G && adapter->scantable[index].privacy */ ) { /* WPA2 enabled */ lbs_pr_debug(1, "is_network_compatible() WPA2: index=%d wpa_ie=%#x " "wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s " "privacy=%#x\n", index, adapter->scantable[index].wpa_ie[0], adapter->scantable[index].rsn_ie[0], (adapter->secinfo.WEPstatus == wlan802_11WEPenabled) ? "e" : "d", (adapter->secinfo.WPAenabled) ? "e" : "d", (adapter->secinfo.WPA2enabled) ? "e" : "d", adapter->scantable[index].privacy); LEAVE(); return index; } else if (adapter->secinfo.WEPstatus == wlan802_11WEPdisabled && !adapter->secinfo.WPAenabled && !adapter->secinfo.WPA2enabled && (adapter->scantable[index].wpa_ie[0] != WPA_IE) && (adapter->scantable[index].rsn_ie[0] != WPA2_IE) && adapter->scantable[index].privacy) { /* dynamic WEP enabled */ lbs_pr_debug(1, "is_network_compatible() dynamic WEP: index=%d " "wpa_ie=%#x wpa2_ie=%#x privacy=%#x\n", index, adapter->scantable[index].wpa_ie[0], adapter->scantable[index].rsn_ie[0], adapter->scantable[index].privacy); LEAVE(); return index; } /* security doesn't match */ lbs_pr_debug(1, "is_network_compatible() FAILED: index=%d wpa_ie=%#x " "wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s privacy=%#x\n", index, adapter->scantable[index].wpa_ie[0], adapter->scantable[index].rsn_ie[0], (adapter->secinfo.WEPstatus == wlan802_11WEPenabled) ? "e" : "d", (adapter->secinfo.WPAenabled) ? "e" : "d", (adapter->secinfo.WPA2enabled) ? "e" : "d", adapter->scantable[index].privacy); LEAVE(); return -ECONNREFUSED; } /* mode doesn't match */ LEAVE(); return -ENETUNREACH; } /** * @brief This function validates a SSID as being able to be printed * * @param pssid SSID structure to validate * * @return TRUE or FALSE */ static u8 ssid_valid(struct WLAN_802_11_SSID *pssid) { int ssididx; for (ssididx = 0; ssididx < pssid->ssidlength; ssididx++) { if (!isprint(pssid->ssid[ssididx])) { return 0; } } return 1; } /** * @brief Post process the scan table after a new scan command has completed * * Inspect each entry of the scan table and try to find an entry that * matches our current associated/joined network from the scan. If * one is found, update the stored copy of the bssdescriptor for our * current network. * * Debug dump the current scan table contents if compiled accordingly. * * @param priv A pointer to wlan_private structure * * @return void */ static void wlan_scan_process_results(wlan_private * priv) { wlan_adapter *adapter = priv->adapter; int foundcurrent; int i; foundcurrent = 0; if (adapter->connect_status == libertas_connected) { /* try to find the current BSSID in the new scan list */ for (i = 0; i < adapter->numinscantable; i++) { if (!libertas_SSID_cmp(&adapter->scantable[i].ssid, &adapter->curbssparams.ssid) && !memcmp(adapter->curbssparams.bssid, adapter->scantable[i].macaddress, ETH_ALEN)) { foundcurrent = 1; } } if (foundcurrent) { /* Make a copy of current BSSID descriptor */ memcpy(&adapter->curbssparams.bssdescriptor, &adapter->scantable[i], sizeof(adapter->curbssparams.bssdescriptor)); } } for (i = 0; i < adapter->numinscantable; i++) { lbs_pr_debug(1, "Scan:(%02d) %02x:%02x:%02x:%02x:%02x:%02x, " "RSSI[%03d], SSID[%s]\n", i, adapter->scantable[i].macaddress[0], adapter->scantable[i].macaddress[1], adapter->scantable[i].macaddress[2], adapter->scantable[i].macaddress[3], adapter->scantable[i].macaddress[4], adapter->scantable[i].macaddress[5], (s32) adapter->scantable[i].rssi, adapter->scantable[i].ssid.ssid); } } /** * @brief Create a channel list for the driver to scan based on region info * * Use the driver region/band information to construct a comprehensive list * of channels to scan. This routine is used for any scan that is not * provided a specific channel list to scan. * * @param priv A pointer to wlan_private structure * @param scanchanlist Output parameter: resulting channel list to scan * @param filteredscan Flag indicating whether or not a BSSID or SSID filter * is being sent in the command to firmware. Used to * increase the number of channels sent in a scan * command and to disable the firmware channel scan * filter. * * @return void */ static void wlan_scan_create_channel_list(wlan_private * priv, struct chanscanparamset * scanchanlist, u8 filteredscan) { wlan_adapter *adapter = priv->adapter; struct region_channel *scanregion; struct chan_freq_power *cfp; int rgnidx; int chanidx; int nextchan; u8 scantype; chanidx = 0; /* Set the default scan type to the user specified type, will later * be changed to passive on a per channel basis if restricted by * regulatory requirements (11d or 11h) */ scantype = adapter->scantype; for (rgnidx = 0; rgnidx < ARRAY_SIZE(adapter->region_channel); rgnidx++) { if (priv->adapter->enable11d && adapter->connect_status != libertas_connected) { /* Scan all the supported chan for the first scan */ if (!adapter->universal_channel[rgnidx].valid) continue; scanregion = &adapter->universal_channel[rgnidx]; /* clear the parsed_region_chan for the first scan */ memset(&adapter->parsed_region_chan, 0x00, sizeof(adapter->parsed_region_chan)); } else { if (!adapter->region_channel[rgnidx].valid) continue; scanregion = &adapter->region_channel[rgnidx]; } for (nextchan = 0; nextchan < scanregion->nrcfp; nextchan++, chanidx++) { cfp = scanregion->CFP + nextchan; if (priv->adapter->enable11d) { scantype = libertas_get_scan_type_11d(cfp->channel, &adapter-> parsed_region_chan); } switch (scanregion->band) { case BAND_B: case BAND_G: default: scanchanlist[chanidx].radiotype = cmd_scan_radio_type_bg; break; } if (scantype == cmd_scan_type_passive) { scanchanlist[chanidx].maxscantime = cpu_to_le16 (MRVDRV_PASSIVE_SCAN_CHAN_TIME); scanchanlist[chanidx].chanscanmode.passivescan = 1; } else { scanchanlist[chanidx].maxscantime = cpu_to_le16 (MRVDRV_ACTIVE_SCAN_CHAN_TIME); scanchanlist[chanidx].chanscanmode.passivescan = 0; } scanchanlist[chanidx].channumber = cfp->channel; if (filteredscan) { scanchanlist[chanidx].chanscanmode. disablechanfilt = 1; } } } } /** * @brief Construct a wlan_scan_cmd_config structure to use in issue scan cmds * * Application layer or other functions can invoke wlan_scan_networks * with a scan configuration supplied in a wlan_ioctl_user_scan_cfg struct. * This structure is used as the basis of one or many wlan_scan_cmd_config * commands that are sent to the command processing module and sent to * firmware. * * Create a wlan_scan_cmd_config based on the following user supplied * parameters (if present): * - SSID filter * - BSSID filter * - Number of Probes to be sent * - channel list * * If the SSID or BSSID filter is not present, disable/clear the filter. * If the number of probes is not set, use the adapter default setting * Qualify the channel * * @param priv A pointer to wlan_private structure * @param puserscanin NULL or pointer to scan configuration parameters * @param ppchantlvout Output parameter: Pointer to the start of the * channel TLV portion of the output scan config * @param pscanchanlist Output parameter: Pointer to the resulting channel * list to scan * @param pmaxchanperscan Output parameter: Number of channels to scan for * each issuance of the firmware scan command * @param pfilteredscan Output parameter: Flag indicating whether or not * a BSSID or SSID filter is being sent in the * command to firmware. Used to increase the number * of channels sent in a scan command and to * disable the firmware channel scan filter. * @param pscancurrentonly Output parameter: Flag indicating whether or not * we are only scanning our current active channel * * @return resulting scan configuration */ static struct wlan_scan_cmd_config * wlan_scan_setup_scan_config(wlan_private * priv, const struct wlan_ioctl_user_scan_cfg * puserscanin, struct mrvlietypes_chanlistparamset ** ppchantlvout, struct chanscanparamset * pscanchanlist, int *pmaxchanperscan, u8 * pfilteredscan, u8 * pscancurrentonly) { wlan_adapter *adapter = priv->adapter; const u8 zeromac[ETH_ALEN] = { 0, 0, 0, 0, 0, 0 }; struct mrvlietypes_numprobes *pnumprobestlv; struct mrvlietypes_ssidparamset *pssidtlv; struct wlan_scan_cmd_config * pscancfgout = NULL; u8 *ptlvpos; u16 numprobes; u16 ssidlen; int chanidx; int scantype; int scandur; int channel; int radiotype; pscancfgout = kzalloc(MAX_SCAN_CFG_ALLOC, GFP_KERNEL); if (pscancfgout == NULL) goto out; /* The tlvbufferlen is calculated for each scan command. The TLVs added * in this routine will be preserved since the routine that sends * the command will append channelTLVs at *ppchantlvout. The difference * between the *ppchantlvout and the tlvbuffer start will be used * to calculate the size of anything we add in this routine. */ pscancfgout->tlvbufferlen = 0; /* Running tlv pointer. Assigned to ppchantlvout at end of function * so later routines know where channels can be added to the command buf */ ptlvpos = pscancfgout->tlvbuffer; /* * Set the initial scan paramters for progressive scanning. If a specific * BSSID or SSID is used, the number of channels in the scan command * will be increased to the absolute maximum */ *pmaxchanperscan = MRVDRV_CHANNELS_PER_SCAN_CMD; /* Initialize the scan as un-filtered by firmware, set to TRUE below if * a SSID or BSSID filter is sent in the command */ *pfilteredscan = 0; /* Initialize the scan as not being only on the current channel. If * the channel list is customized, only contains one channel, and * is the active channel, this is set true and data flow is not halted. */ *pscancurrentonly = 0; if (puserscanin) { /* Set the bss type scan filter, use adapter setting if unset */ pscancfgout->bsstype = (puserscanin->bsstype ? puserscanin->bsstype : adapter-> scanmode); /* Set the number of probes to send, use adapter setting if unset */ numprobes = (puserscanin->numprobes ? puserscanin->numprobes : adapter->scanprobes); /* * Set the BSSID filter to the incoming configuration, * if non-zero. If not set, it will remain disabled (all zeros). */ memcpy(pscancfgout->specificBSSID, puserscanin->specificBSSID, sizeof(pscancfgout->specificBSSID)); ssidlen = strlen(puserscanin->specificSSID); if (ssidlen) { pssidtlv = (struct mrvlietypes_ssidparamset *) pscancfgout-> tlvbuffer; pssidtlv->header.type = cpu_to_le16(TLV_TYPE_SSID); pssidtlv->header.len = cpu_to_le16(ssidlen); memcpy(pssidtlv->ssid, puserscanin->specificSSID, ssidlen); ptlvpos += sizeof(pssidtlv->header) + ssidlen; } /* * The default number of channels sent in the command is low to * ensure the response buffer from the firmware does not truncate * scan results. That is not an issue with an SSID or BSSID * filter applied to the scan results in the firmware. */ if (ssidlen || (memcmp(pscancfgout->specificBSSID, &zeromac, sizeof(zeromac)) != 0)) { *pmaxchanperscan = MRVDRV_MAX_CHANNELS_PER_SCAN; *pfilteredscan = 1; } } else { pscancfgout->bsstype = adapter->scanmode; numprobes = adapter->scanprobes; } /* If the input config or adapter has the number of Probes set, add tlv */ if (numprobes) { pnumprobestlv = (struct mrvlietypes_numprobes *) ptlvpos; pnumprobestlv->header.type = cpu_to_le16(TLV_TYPE_NUMPROBES); pnumprobestlv->header.len = sizeof(pnumprobestlv->numprobes); pnumprobestlv->numprobes = cpu_to_le16(numprobes); ptlvpos += sizeof(pnumprobestlv->header) + pnumprobestlv->header.len; pnumprobestlv->header.len = cpu_to_le16(pnumprobestlv->header.len); } /* * Set the output for the channel TLV to the address in the tlv buffer * past any TLVs that were added in this fuction (SSID, numprobes). * channel TLVs will be added past this for each scan command, preserving * the TLVs that were previously added. */ *ppchantlvout = (struct mrvlietypes_chanlistparamset *) ptlvpos; if (puserscanin && puserscanin->chanlist[0].channumber) { lbs_pr_debug(1, "Scan: Using supplied channel list\n"); for (chanidx = 0; chanidx < WLAN_IOCTL_USER_SCAN_CHAN_MAX && puserscanin->chanlist[chanidx].channumber; chanidx++) { channel = puserscanin->chanlist[chanidx].channumber; (pscanchanlist + chanidx)->channumber = channel; radiotype = puserscanin->chanlist[chanidx].radiotype; (pscanchanlist + chanidx)->radiotype = radiotype; scantype = puserscanin->chanlist[chanidx].scantype; if (scantype == cmd_scan_type_passive) { (pscanchanlist + chanidx)->chanscanmode.passivescan = 1; } else { (pscanchanlist + chanidx)->chanscanmode.passivescan = 0; } if (puserscanin->chanlist[chanidx].scantime) { scandur = puserscanin->chanlist[chanidx].scantime; } else { if (scantype == cmd_scan_type_passive) { scandur = MRVDRV_PASSIVE_SCAN_CHAN_TIME; } else { scandur = MRVDRV_ACTIVE_SCAN_CHAN_TIME; } } (pscanchanlist + chanidx)->minscantime = cpu_to_le16(scandur); (pscanchanlist + chanidx)->maxscantime = cpu_to_le16(scandur); } /* Check if we are only scanning the current channel */ if ((chanidx == 1) && (puserscanin->chanlist[0].channumber == priv->adapter->curbssparams.channel)) { *pscancurrentonly = 1; lbs_pr_debug(1, "Scan: Scanning current channel only"); } } else { lbs_pr_debug(1, "Scan: Creating full region channel list\n"); wlan_scan_create_channel_list(priv, pscanchanlist, *pfilteredscan); } out: return pscancfgout; } /** * @brief Construct and send multiple scan config commands to the firmware * * Previous routines have created a wlan_scan_cmd_config with any requested * TLVs. This function splits the channel TLV into maxchanperscan lists * and sends the portion of the channel TLV along with the other TLVs * to the wlan_cmd routines for execution in the firmware. * * @param priv A pointer to wlan_private structure * @param maxchanperscan Maximum number channels to be included in each * scan command sent to firmware * @param filteredscan Flag indicating whether or not a BSSID or SSID * filter is being used for the firmware command * scan command sent to firmware * @param pscancfgout Scan configuration used for this scan. * @param pchantlvout Pointer in the pscancfgout where the channel TLV * should start. This is past any other TLVs that * must be sent down in each firmware command. * @param pscanchanlist List of channels to scan in maxchanperscan segments * * @return 0 or error return otherwise */ static int wlan_scan_channel_list(wlan_private * priv, int maxchanperscan, u8 filteredscan, struct wlan_scan_cmd_config * pscancfgout, struct mrvlietypes_chanlistparamset * pchantlvout, struct chanscanparamset * pscanchanlist) { struct chanscanparamset *ptmpchan; struct chanscanparamset *pstartchan; u8 scanband; int doneearly; int tlvidx; int ret = 0; ENTER(); if (pscancfgout == 0 || pchantlvout == 0 || pscanchanlist == 0) { lbs_pr_debug(1, "Scan: Null detect: %p, %p, %p\n", pscancfgout, pchantlvout, pscanchanlist); return -1; } pchantlvout->header.type = cpu_to_le16(TLV_TYPE_CHANLIST); /* Set the temp channel struct pointer to the start of the desired list */ ptmpchan = pscanchanlist; /* Loop through the desired channel list, sending a new firmware scan * commands for each maxchanperscan channels (or for 1,6,11 individually * if configured accordingly) */ while (ptmpchan->channumber) { tlvidx = 0; pchantlvout->header.len = 0; scanband = ptmpchan->radiotype; pstartchan = ptmpchan; doneearly = 0; /* Construct the channel TLV for the scan command. Continue to * insert channel TLVs until: * - the tlvidx hits the maximum configured per scan command * - the next channel to insert is 0 (end of desired channel list) * - doneearly is set (controlling individual scanning of 1,6,11) */ while (tlvidx < maxchanperscan && ptmpchan->channumber && !doneearly) { lbs_pr_debug(1, "Scan: Chan(%3d), Radio(%d), mode(%d,%d), Dur(%d)\n", ptmpchan->channumber, ptmpchan->radiotype, ptmpchan->chanscanmode.passivescan, ptmpchan->chanscanmode.disablechanfilt, ptmpchan->maxscantime); /* Copy the current channel TLV to the command being prepared */ memcpy(pchantlvout->chanscanparam + tlvidx, ptmpchan, sizeof(pchantlvout->chanscanparam)); /* Increment the TLV header length by the size appended */ pchantlvout->header.len += sizeof(pchantlvout->chanscanparam); /* * The tlv buffer length is set to the number of bytes of the * between the channel tlv pointer and the start of the * tlv buffer. This compensates for any TLVs that were appended * before the channel list. */ pscancfgout->tlvbufferlen = ((u8 *) pchantlvout - pscancfgout->tlvbuffer); /* Add the size of the channel tlv header and the data length */ pscancfgout->tlvbufferlen += (sizeof(pchantlvout->header) + pchantlvout->header.len); /* Increment the index to the channel tlv we are constructing */ tlvidx++; doneearly = 0; /* Stop the loop if the *current* channel is in the 1,6,11 set * and we are not filtering on a BSSID or SSID. */ if (!filteredscan && (ptmpchan->channumber == 1 || ptmpchan->channumber == 6 || ptmpchan->channumber == 11)) { doneearly = 1; } /* Increment the tmp pointer to the next channel to be scanned */ ptmpchan++; /* Stop the loop if the *next* channel is in the 1,6,11 set. * This will cause it to be the only channel scanned on the next * interation */ if (!filteredscan && (ptmpchan->channumber == 1 || ptmpchan->channumber == 6 || ptmpchan->channumber == 11)) { doneearly = 1; } } /* Send the scan command to the firmware with the specified cfg */ ret = libertas_prepare_and_send_command(priv, cmd_802_11_scan, 0, 0, 0, pscancfgout); } LEAVE(); return ret; } /** * @brief Internal function used to start a scan based on an input config * * Use the input user scan configuration information when provided in * order to send the appropriate scan commands to firmware to populate or * update the internal driver scan table * * @param priv A pointer to wlan_private structure * @param puserscanin Pointer to the input configuration for the requested * scan. * * @return 0 or < 0 if error */ int wlan_scan_networks(wlan_private * priv, const struct wlan_ioctl_user_scan_cfg * puserscanin) { wlan_adapter *adapter = priv->adapter; struct mrvlietypes_chanlistparamset *pchantlvout; struct chanscanparamset * scan_chan_list = NULL; struct wlan_scan_cmd_config * scan_cfg = NULL; u8 keeppreviousscan; u8 filteredscan; u8 scancurrentchanonly; int maxchanperscan; int ret; ENTER(); scan_chan_list = kzalloc(sizeof(struct chanscanparamset) * WLAN_IOCTL_USER_SCAN_CHAN_MAX, GFP_KERNEL); if (scan_chan_list == NULL) { ret = -ENOMEM; goto out; } scan_cfg = wlan_scan_setup_scan_config(priv, puserscanin, &pchantlvout, scan_chan_list, &maxchanperscan, &filteredscan, &scancurrentchanonly); if (scan_cfg == NULL) { ret = -ENOMEM; goto out; } keeppreviousscan = 0; if (puserscanin) { keeppreviousscan = puserscanin->keeppreviousscan; } if (!keeppreviousscan) { memset(adapter->scantable, 0x00, sizeof(struct bss_descriptor) * MRVDRV_MAX_BSSID_LIST); adapter->numinscantable = 0; } /* Keep the data path active if we are only scanning our current channel */ if (!scancurrentchanonly) { netif_stop_queue(priv->wlan_dev.netdev); netif_carrier_off(priv->wlan_dev.netdev); } ret = wlan_scan_channel_list(priv, maxchanperscan, filteredscan, scan_cfg, pchantlvout, scan_chan_list); /* Process the resulting scan table: * - Remove any bad ssids * - Update our current BSS information from scan data */ wlan_scan_process_results(priv); if (priv->adapter->connect_status == libertas_connected) { netif_carrier_on(priv->wlan_dev.netdev); netif_wake_queue(priv->wlan_dev.netdev); } out: if (scan_cfg) kfree(scan_cfg); if (scan_chan_list) kfree(scan_chan_list); LEAVE(); return ret; } /** * @brief Inspect the scan response buffer for pointers to expected TLVs * * TLVs can be included at the end of the scan response BSS information. * Parse the data in the buffer for pointers to TLVs that can potentially * be passed back in the response * * @param ptlv Pointer to the start of the TLV buffer to parse * @param tlvbufsize size of the TLV buffer * @param ptsftlv Output parameter: Pointer to the TSF TLV if found * * @return void */ static void wlan_ret_802_11_scan_get_tlv_ptrs(struct mrvlietypes_data * ptlv, int tlvbufsize, struct mrvlietypes_tsftimestamp ** ptsftlv) { struct mrvlietypes_data *pcurrenttlv; int tlvbufleft; u16 tlvtype; u16 tlvlen; pcurrenttlv = ptlv; tlvbufleft = tlvbufsize; *ptsftlv = NULL; lbs_pr_debug(1, "SCAN_RESP: tlvbufsize = %d\n", tlvbufsize); lbs_dbg_hex("SCAN_RESP: TLV Buf", (u8 *) ptlv, tlvbufsize); while (tlvbufleft >= sizeof(struct mrvlietypesheader)) { tlvtype = le16_to_cpu(pcurrenttlv->header.type); tlvlen = le16_to_cpu(pcurrenttlv->header.len); switch (tlvtype) { case TLV_TYPE_TSFTIMESTAMP: *ptsftlv = (struct mrvlietypes_tsftimestamp *) pcurrenttlv; break; default: lbs_pr_debug(1, "SCAN_RESP: Unhandled TLV = %d\n", tlvtype); /* Give up, this seems corrupted */ return; } /* switch */ tlvbufleft -= (sizeof(ptlv->header) + tlvlen); pcurrenttlv = (struct mrvlietypes_data *) (pcurrenttlv->Data + tlvlen); } /* while */ } /** * @brief Interpret a BSS scan response returned from the firmware * * Parse the various fixed fields and IEs passed back for a a BSS probe * response or beacon from the scan command. Record information as needed * in the scan table struct bss_descriptor for that entry. * * @param pBSSIDEntry Output parameter: Pointer to the BSS Entry * * @return 0 or -1 */ static int InterpretBSSDescriptionWithIE(struct bss_descriptor * pBSSEntry, u8 ** pbeaconinfo, int *bytesleft) { enum ieeetypes_elementid elemID; struct ieeetypes_fhparamset *pFH; struct ieeetypes_dsparamset *pDS; struct ieeetypes_cfparamset *pCF; struct ieeetypes_ibssparamset *pibss; struct ieeetypes_capinfo *pcap; struct WLAN_802_11_FIXED_IEs fixedie; u8 *pcurrentptr; u8 *pRate; u8 elemlen; u8 bytestocopy; u8 ratesize; u16 beaconsize; u8 founddatarateie; int bytesleftforcurrentbeacon; struct IE_WPA *pIe; const u8 oui01[4] = { 0x00, 0x50, 0xf2, 0x01 }; struct ieeetypes_countryinfoset *pcountryinfo; ENTER(); founddatarateie = 0; ratesize = 0; beaconsize = 0; if (*bytesleft >= sizeof(beaconsize)) { /* Extract & convert beacon size from the command buffer */ memcpy(&beaconsize, *pbeaconinfo, sizeof(beaconsize)); beaconsize = le16_to_cpu(beaconsize); *bytesleft -= sizeof(beaconsize); *pbeaconinfo += sizeof(beaconsize); } if (beaconsize == 0 || beaconsize > *bytesleft) { *pbeaconinfo += *bytesleft; *bytesleft = 0; return -1; } /* Initialize the current working beacon pointer for this BSS iteration */ pcurrentptr = *pbeaconinfo; /* Advance the return beacon pointer past the current beacon */ *pbeaconinfo += beaconsize; *bytesleft -= beaconsize; bytesleftforcurrentbeacon = beaconsize; memcpy(pBSSEntry->macaddress, pcurrentptr, ETH_ALEN); lbs_pr_debug(1, "InterpretIE: AP MAC Addr-%x:%x:%x:%x:%x:%x\n", pBSSEntry->macaddress[0], pBSSEntry->macaddress[1], pBSSEntry->macaddress[2], pBSSEntry->macaddress[3], pBSSEntry->macaddress[4], pBSSEntry->macaddress[5]); pcurrentptr += ETH_ALEN; bytesleftforcurrentbeacon -= ETH_ALEN; if (bytesleftforcurrentbeacon < 12) { lbs_pr_debug(1, "InterpretIE: Not enough bytes left\n"); return -1; } /* * next 4 fields are RSSI, time stamp, beacon interval, * and capability information */ /* RSSI is 1 byte long */ pBSSEntry->rssi = le32_to_cpu((long)(*pcurrentptr)); lbs_pr_debug(1, "InterpretIE: RSSI=%02X\n", *pcurrentptr); pcurrentptr += 1; bytesleftforcurrentbeacon -= 1; /* time stamp is 8 bytes long */ memcpy(fixedie.timestamp, pcurrentptr, 8); memcpy(pBSSEntry->timestamp, pcurrentptr, 8); pcurrentptr += 8; bytesleftforcurrentbeacon -= 8; /* beacon interval is 2 bytes long */ memcpy(&fixedie.beaconinterval, pcurrentptr, 2); pBSSEntry->beaconperiod = le16_to_cpu(fixedie.beaconinterval); pcurrentptr += 2; bytesleftforcurrentbeacon -= 2; /* capability information is 2 bytes long */ memcpy(&fixedie.capabilities, pcurrentptr, 2); lbs_pr_debug(1, "InterpretIE: fixedie.capabilities=0x%X\n", fixedie.capabilities); fixedie.capabilities = le16_to_cpu(fixedie.capabilities); pcap = (struct ieeetypes_capinfo *) & fixedie.capabilities; memcpy(&pBSSEntry->cap, pcap, sizeof(struct ieeetypes_capinfo)); pcurrentptr += 2; bytesleftforcurrentbeacon -= 2; /* rest of the current buffer are IE's */ lbs_pr_debug(1, "InterpretIE: IElength for this AP = %d\n", bytesleftforcurrentbeacon); lbs_dbg_hex("InterpretIE: IE info", (u8 *) pcurrentptr, bytesleftforcurrentbeacon); if (pcap->privacy) { lbs_pr_debug(1, "InterpretIE: AP WEP enabled\n"); pBSSEntry->privacy = wlan802_11privfilter8021xWEP; } else { pBSSEntry->privacy = wlan802_11privfilteracceptall; } if (pcap->ibss == 1) { pBSSEntry->inframode = wlan802_11ibss; } else { pBSSEntry->inframode = wlan802_11infrastructure; } /* process variable IE */ while (bytesleftforcurrentbeacon >= 2) { elemID = (enum ieeetypes_elementid) (*((u8 *) pcurrentptr)); elemlen = *((u8 *) pcurrentptr + 1); if (bytesleftforcurrentbeacon < elemlen) { lbs_pr_debug(1, "InterpretIE: error in processing IE, " "bytes left < IE length\n"); bytesleftforcurrentbeacon = 0; continue; } switch (elemID) { case SSID: pBSSEntry->ssid.ssidlength = elemlen; memcpy(pBSSEntry->ssid.ssid, (pcurrentptr + 2), elemlen); lbs_pr_debug(1, "ssid: %32s", pBSSEntry->ssid.ssid); break; case SUPPORTED_RATES: memcpy(pBSSEntry->datarates, (pcurrentptr + 2), elemlen); memmove(pBSSEntry->libertas_supported_rates, (pcurrentptr + 2), elemlen); ratesize = elemlen; founddatarateie = 1; break; case EXTRA_IE: lbs_pr_debug(1, "InterpretIE: EXTRA_IE Found!\n"); pBSSEntry->extra_ie = 1; break; case FH_PARAM_SET: pFH = (struct ieeetypes_fhparamset *) pcurrentptr; memmove(&pBSSEntry->phyparamset.fhparamset, pFH, sizeof(struct ieeetypes_fhparamset)); pBSSEntry->phyparamset.fhparamset.dwelltime = le16_to_cpu(pBSSEntry->phyparamset.fhparamset. dwelltime); break; case DS_PARAM_SET: pDS = (struct ieeetypes_dsparamset *) pcurrentptr; pBSSEntry->channel = pDS->currentchan; memcpy(&pBSSEntry->phyparamset.dsparamset, pDS, sizeof(struct ieeetypes_dsparamset)); break; case CF_PARAM_SET: pCF = (struct ieeetypes_cfparamset *) pcurrentptr; memcpy(&pBSSEntry->ssparamset.cfparamset, pCF, sizeof(struct ieeetypes_cfparamset)); break; case IBSS_PARAM_SET: pibss = (struct ieeetypes_ibssparamset *) pcurrentptr; pBSSEntry->atimwindow = le32_to_cpu(pibss->atimwindow); memmove(&pBSSEntry->ssparamset.ibssparamset, pibss, sizeof(struct ieeetypes_ibssparamset)); pBSSEntry->ssparamset.ibssparamset.atimwindow = le16_to_cpu(pBSSEntry->ssparamset.ibssparamset. atimwindow); break; /* Handle Country Info IE */ case COUNTRY_INFO: pcountryinfo = (struct ieeetypes_countryinfoset *) pcurrentptr; if (pcountryinfo->len < sizeof(pcountryinfo->countrycode) || pcountryinfo->len > 254) { lbs_pr_debug(1, "InterpretIE: 11D- Err " "CountryInfo len =%d min=%d max=254\n", pcountryinfo->len, sizeof(pcountryinfo->countrycode)); LEAVE(); return -1; } memcpy(&pBSSEntry->countryinfo, pcountryinfo, pcountryinfo->len + 2); lbs_dbg_hex("InterpretIE: 11D- CountryInfo:", (u8 *) pcountryinfo, (u32) (pcountryinfo->len + 2)); break; case EXTENDED_SUPPORTED_RATES: /* * only process extended supported rate * if data rate is already found. * data rate IE should come before * extended supported rate IE */ if (founddatarateie) { if ((elemlen + ratesize) > WLAN_SUPPORTED_RATES) { bytestocopy = (WLAN_SUPPORTED_RATES - ratesize); } else { bytestocopy = elemlen; } pRate = (u8 *) pBSSEntry->datarates; pRate += ratesize; memmove(pRate, (pcurrentptr + 2), bytestocopy); pRate = (u8 *) pBSSEntry->libertas_supported_rates; pRate += ratesize; memmove(pRate, (pcurrentptr + 2), bytestocopy); } break; case VENDOR_SPECIFIC_221: #define IE_ID_LEN_FIELDS_BYTES 2 pIe = (struct IE_WPA *)pcurrentptr; if (memcmp(pIe->oui, oui01, sizeof(oui01))) break; pBSSEntry->wpa_ie_len = min_t(size_t, elemlen + IE_ID_LEN_FIELDS_BYTES, sizeof(pBSSEntry->wpa_ie)); memcpy(pBSSEntry->wpa_ie, pcurrentptr, pBSSEntry->wpa_ie_len); lbs_dbg_hex("InterpretIE: Resp WPA_IE", pBSSEntry->wpa_ie, elemlen); break; case WPA2_IE: pIe = (struct IE_WPA *)pcurrentptr; pBSSEntry->rsn_ie_len = min_t(size_t, elemlen + IE_ID_LEN_FIELDS_BYTES, sizeof(pBSSEntry->rsn_ie)); memcpy(pBSSEntry->rsn_ie, pcurrentptr, pBSSEntry->rsn_ie_len); lbs_dbg_hex("InterpretIE: Resp WPA2_IE", pBSSEntry->rsn_ie, elemlen); break; case TIM: break; case CHALLENGE_TEXT: break; } pcurrentptr += elemlen + 2; /* need to account for IE ID and IE len */ bytesleftforcurrentbeacon -= (elemlen + 2); } /* while (bytesleftforcurrentbeacon > 2) */ return 0; } /** * @brief Compare two SSIDs * * @param ssid1 A pointer to ssid to compare * @param ssid2 A pointer to ssid to compare * * @return 0--ssid is same, otherwise is different */ int libertas_SSID_cmp(struct WLAN_802_11_SSID *ssid1, struct WLAN_802_11_SSID *ssid2) { if (!ssid1 || !ssid2) return -1; if (ssid1->ssidlength != ssid2->ssidlength) return -1; return memcmp(ssid1->ssid, ssid2->ssid, ssid1->ssidlength); } /** * @brief This function finds a specific compatible BSSID in the scan list * * @param adapter A pointer to wlan_adapter * @param bssid BSSID to find in the scan list * @param mode Network mode: Infrastructure or IBSS * * @return index in BSSID list, or error return code (< 0) */ int libertas_find_BSSID_in_list(wlan_adapter * adapter, u8 * bssid, int mode) { int ret = -ENETUNREACH; int i; if (!bssid) return -EFAULT; lbs_pr_debug(1, "FindBSSID: Num of BSSIDs = %d\n", adapter->numinscantable); /* Look through the scan table for a compatible match. The ret return * variable will be equal to the index in the scan table (greater * than zero) if the network is compatible. The loop will continue * past a matched bssid that is not compatible in case there is an * AP with multiple SSIDs assigned to the same BSSID */ for (i = 0; ret < 0 && i < adapter->numinscantable; i++) { if (!memcmp(adapter->scantable[i].macaddress, bssid, ETH_ALEN)) { switch (mode) { case wlan802_11infrastructure: case wlan802_11ibss: ret = is_network_compatible(adapter, i, mode); break; default: ret = i; break; } } } return ret; } /** * @brief This function finds ssid in ssid list. * * @param adapter A pointer to wlan_adapter * @param ssid SSID to find in the list * @param bssid BSSID to qualify the SSID selection (if provided) * @param mode Network mode: Infrastructure or IBSS * * @return index in BSSID list */ int libertas_find_SSID_in_list(wlan_adapter * adapter, struct WLAN_802_11_SSID *ssid, u8 * bssid, int mode) { int net = -ENETUNREACH; u8 bestrssi = 0; int i; int j; lbs_pr_debug(1, "Num of Entries in Table = %d\n", adapter->numinscantable); for (i = 0; i < adapter->numinscantable; i++) { if (!libertas_SSID_cmp(&adapter->scantable[i].ssid, ssid) && (!bssid || !memcmp(adapter->scantable[i]. macaddress, bssid, ETH_ALEN))) { switch (mode) { case wlan802_11infrastructure: case wlan802_11ibss: j = is_network_compatible(adapter, i, mode); if (j >= 0) { if (bssid) { return i; } if (SCAN_RSSI (adapter->scantable[i].rssi) > bestrssi) { bestrssi = SCAN_RSSI(adapter-> scantable[i]. rssi); net = i; } } else { if (net == -ENETUNREACH) { net = j; } } break; case wlan802_11autounknown: default: if (SCAN_RSSI(adapter->scantable[i].rssi) > bestrssi) { bestrssi = SCAN_RSSI(adapter->scantable[i]. rssi); net = i; } break; } } } return net; } /** * @brief This function finds the best SSID in the Scan List * * Search the scan table for the best SSID that also matches the current * adapter network preference (infrastructure or adhoc) * * @param adapter A pointer to wlan_adapter * * @return index in BSSID list */ int libertas_find_best_SSID_in_list(wlan_adapter * adapter, enum WLAN_802_11_NETWORK_INFRASTRUCTURE mode) { int bestnet = -ENETUNREACH; u8 bestrssi = 0; int i; ENTER(); lbs_pr_debug(1, "Num of BSSIDs = %d\n", adapter->numinscantable); for (i = 0; i < adapter->numinscantable; i++) { switch (mode) { case wlan802_11infrastructure: case wlan802_11ibss: if (is_network_compatible(adapter, i, mode) >= 0) { if (SCAN_RSSI(adapter->scantable[i].rssi) > bestrssi) { bestrssi = SCAN_RSSI(adapter->scantable[i]. rssi); bestnet = i; } } break; case wlan802_11autounknown: default: if (SCAN_RSSI(adapter->scantable[i].rssi) > bestrssi) { bestrssi = SCAN_RSSI(adapter->scantable[i].rssi); bestnet = i; } break; } } LEAVE(); return bestnet; } /** * @brief Find the AP with specific ssid in the scan list * * @param priv A pointer to wlan_private structure * @param pSSID A pointer to AP's ssid * * @return 0--success, otherwise--fail */ int libertas_find_best_network_SSID(wlan_private * priv, struct WLAN_802_11_SSID *pSSID, enum WLAN_802_11_NETWORK_INFRASTRUCTURE preferred_mode, enum WLAN_802_11_NETWORK_INFRASTRUCTURE *out_mode) { wlan_adapter *adapter = priv->adapter; int ret = 0; struct bss_descriptor *preqbssid; int i; ENTER(); memset(pSSID, 0, sizeof(struct WLAN_802_11_SSID)); wlan_scan_networks(priv, NULL); if (adapter->surpriseremoved) return -1; wait_event_interruptible(adapter->cmd_pending, !adapter->nr_cmd_pending); i = libertas_find_best_SSID_in_list(adapter, preferred_mode); if (i < 0) { ret = -1; goto out; } preqbssid = &adapter->scantable[i]; memcpy(pSSID, &preqbssid->ssid, sizeof(struct WLAN_802_11_SSID)); *out_mode = preqbssid->inframode; if (!pSSID->ssidlength) { ret = -1; } out: LEAVE(); return ret; } /** * @brief Scan Network * * @param dev A pointer to net_device structure * @param info A pointer to iw_request_info structure * @param vwrq A pointer to iw_param structure * @param extra A pointer to extra data buf * * @return 0 --success, otherwise fail */ int libertas_set_scan(struct net_device *dev, struct iw_request_info *info, struct iw_param *vwrq, char *extra) { wlan_private *priv = dev->priv; wlan_adapter *adapter = priv->adapter; union iwreq_data wrqu; ENTER(); if (!wlan_scan_networks(priv, NULL)) { memset(&wrqu, 0, sizeof(union iwreq_data)); wireless_send_event(priv->wlan_dev.netdev, SIOCGIWSCAN, &wrqu, NULL); } if (adapter->surpriseremoved) return -1; LEAVE(); return 0; } /** * @brief Send a scan command for all available channels filtered on a spec * * @param priv A pointer to wlan_private structure * @param prequestedssid A pointer to AP's ssid * @param keeppreviousscan Flag used to save/clear scan table before scan * * @return 0-success, otherwise fail */ int libertas_send_specific_SSID_scan(wlan_private * priv, struct WLAN_802_11_SSID *prequestedssid, u8 keeppreviousscan) { wlan_adapter *adapter = priv->adapter; struct wlan_ioctl_user_scan_cfg scancfg; ENTER(); if (prequestedssid == NULL) { return -1; } memset(&scancfg, 0x00, sizeof(scancfg)); memcpy(scancfg.specificSSID, prequestedssid->ssid, prequestedssid->ssidlength); scancfg.keeppreviousscan = keeppreviousscan; wlan_scan_networks(priv, &scancfg); if (adapter->surpriseremoved) return -1; wait_event_interruptible(adapter->cmd_pending, !adapter->nr_cmd_pending); LEAVE(); return 0; } /** * @brief scan an AP with specific BSSID * * @param priv A pointer to wlan_private structure * @param bssid A pointer to AP's bssid * @param keeppreviousscan Flag used to save/clear scan table before scan * * @return 0-success, otherwise fail */ int libertas_send_specific_BSSID_scan(wlan_private * priv, u8 * bssid, u8 keeppreviousscan) { struct wlan_ioctl_user_scan_cfg scancfg; ENTER(); if (bssid == NULL) { return -1; } memset(&scancfg, 0x00, sizeof(scancfg)); memcpy(scancfg.specificBSSID, bssid, sizeof(scancfg.specificBSSID)); scancfg.keeppreviousscan = keeppreviousscan; wlan_scan_networks(priv, &scancfg); if (priv->adapter->surpriseremoved) return -1; wait_event_interruptible(priv->adapter->cmd_pending, !priv->adapter->nr_cmd_pending); LEAVE(); return 0; } /** * @brief Retrieve the scan table entries via wireless tools IOCTL call * * @param dev A pointer to net_device structure * @param info A pointer to iw_request_info structure * @param dwrq A pointer to iw_point structure * @param extra A pointer to extra data buf * * @return 0 --success, otherwise fail */ int libertas_get_scan(struct net_device *dev, struct iw_request_info *info, struct iw_point *dwrq, char *extra) { wlan_private *priv = dev->priv; wlan_adapter *adapter = priv->adapter; int ret = 0; char *current_ev = extra; char *end_buf = extra + IW_SCAN_MAX_DATA; struct chan_freq_power *cfp; struct bss_descriptor *pscantable; char *current_val; /* For rates */ struct iw_event iwe; /* Temporary buffer */ int i; int j; int rate; #define PERFECT_RSSI ((u8)50) #define WORST_RSSI ((u8)0) #define RSSI_DIFF ((u8)(PERFECT_RSSI - WORST_RSSI)) u8 rssi; u8 buf[16 + 256 * 2]; u8 *ptr; ENTER(); /* * if there's either commands in the queue or one being * processed return -EAGAIN for iwlist to retry later. */ if (adapter->nr_cmd_pending) return -EAGAIN; if (adapter->connect_status == libertas_connected) lbs_pr_debug(1, "Current ssid: %32s\n", adapter->curbssparams.ssid.ssid); lbs_pr_debug(1, "Scan: Get: numinscantable = %d\n", adapter->numinscantable); /* The old API using SIOCGIWAPLIST had a hard limit of IW_MAX_AP. * The new API using SIOCGIWSCAN is only limited by buffer size * WE-14 -> WE-16 the buffer is limited to IW_SCAN_MAX_DATA bytes * which is 4096. */ for (i = 0; i < adapter->numinscantable; i++) { if ((current_ev + MAX_SCAN_CELL_SIZE) >= end_buf) { lbs_pr_debug(1, "i=%d break out: current_ev=%p end_buf=%p " "MAX_SCAN_CELL_SIZE=%d\n", i, current_ev, end_buf, MAX_SCAN_CELL_SIZE); break; } pscantable = &adapter->scantable[i]; lbs_pr_debug(1, "i=%d ssid: %32s\n", i, pscantable->ssid.ssid); cfp = libertas_find_cfp_by_band_and_channel(adapter, 0, pscantable->channel); if (!cfp) { lbs_pr_debug(1, "Invalid channel number %d\n", pscantable->channel); continue; } if (!ssid_valid(&adapter->scantable[i].ssid)) { continue; } /* First entry *MUST* be the AP MAC address */ iwe.cmd = SIOCGIWAP; iwe.u.ap_addr.sa_family = ARPHRD_ETHER; memcpy(iwe.u.ap_addr.sa_data, &adapter->scantable[i].macaddress, ETH_ALEN); iwe.len = IW_EV_ADDR_LEN; current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe, iwe.len); //Add the ESSID iwe.u.data.length = adapter->scantable[i].ssid.ssidlength; if (iwe.u.data.length > 32) { iwe.u.data.length = 32; } iwe.cmd = SIOCGIWESSID; iwe.u.data.flags = 1; iwe.len = IW_EV_POINT_LEN + iwe.u.data.length; current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe, adapter->scantable[i].ssid. ssid); //Add mode iwe.cmd = SIOCGIWMODE; iwe.u.mode = adapter->scantable[i].inframode + 1; iwe.len = IW_EV_UINT_LEN; current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe, iwe.len); //frequency iwe.cmd = SIOCGIWFREQ; iwe.u.freq.m = (long)cfp->freq * 100000; iwe.u.freq.e = 1; iwe.len = IW_EV_FREQ_LEN; current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe, iwe.len); /* Add quality statistics */ iwe.cmd = IWEVQUAL; iwe.u.qual.updated = IW_QUAL_ALL_UPDATED; iwe.u.qual.level = SCAN_RSSI(adapter->scantable[i].rssi); rssi = iwe.u.qual.level - MRVDRV_NF_DEFAULT_SCAN_VALUE; iwe.u.qual.qual = (100 * RSSI_DIFF * RSSI_DIFF - (PERFECT_RSSI - rssi) * (15 * (RSSI_DIFF) + 62 * (PERFECT_RSSI - rssi))) / (RSSI_DIFF * RSSI_DIFF); if (iwe.u.qual.qual > 100) iwe.u.qual.qual = 100; else if (iwe.u.qual.qual < 1) iwe.u.qual.qual = 0; if (adapter->NF[TYPE_BEACON][TYPE_NOAVG] == 0) { iwe.u.qual.noise = MRVDRV_NF_DEFAULT_SCAN_VALUE; } else { iwe.u.qual.noise = CAL_NF(adapter->NF[TYPE_BEACON][TYPE_NOAVG]); } if ((adapter->inframode == wlan802_11ibss) && !libertas_SSID_cmp(&adapter->curbssparams.ssid, &adapter->scantable[i].ssid) && adapter->adhoccreate) { ret = libertas_prepare_and_send_command(priv, cmd_802_11_rssi, 0, cmd_option_waitforrsp, 0, NULL); if (!ret) { iwe.u.qual.level = CAL_RSSI(adapter->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE, adapter->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE); } } iwe.len = IW_EV_QUAL_LEN; current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe, iwe.len); /* Add encryption capability */ iwe.cmd = SIOCGIWENCODE; if (adapter->scantable[i].privacy) { iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; } else { iwe.u.data.flags = IW_ENCODE_DISABLED; } iwe.u.data.length = 0; iwe.len = IW_EV_POINT_LEN + iwe.u.data.length; current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe, adapter->scantable->ssid. ssid); current_val = current_ev + IW_EV_LCP_LEN; iwe.cmd = SIOCGIWRATE; iwe.u.bitrate.fixed = 0; iwe.u.bitrate.disabled = 0; iwe.u.bitrate.value = 0; /* Bit rate given in 500 kb/s units (+ 0x80) */ for (j = 0; j < sizeof(adapter->scantable[i].libertas_supported_rates); j++) { if (adapter->scantable[i].libertas_supported_rates[j] == 0) { break; } rate = (adapter->scantable[i].libertas_supported_rates[j] & 0x7F) * 500000; if (rate > iwe.u.bitrate.value) { iwe.u.bitrate.value = rate; } iwe.u.bitrate.value = (adapter->scantable[i].libertas_supported_rates[j] & 0x7f) * 500000; iwe.len = IW_EV_PARAM_LEN; current_ev = iwe_stream_add_value(current_ev, current_val, end_buf, &iwe, iwe.len); } if ((adapter->scantable[i].inframode == wlan802_11ibss) && !libertas_SSID_cmp(&adapter->curbssparams.ssid, &adapter->scantable[i].ssid) && adapter->adhoccreate) { iwe.u.bitrate.value = 22 * 500000; } iwe.len = IW_EV_PARAM_LEN; current_ev = iwe_stream_add_value(current_ev, current_val, end_buf, &iwe, iwe.len); /* Add new value to event */ current_val = current_ev + IW_EV_LCP_LEN; if (adapter->scantable[i].rsn_ie[0] == WPA2_IE) { memset(&iwe, 0, sizeof(iwe)); memset(buf, 0, sizeof(buf)); memcpy(buf, adapter->scantable[i].rsn_ie, adapter->scantable[i].rsn_ie_len); iwe.cmd = IWEVGENIE; iwe.u.data.length = adapter->scantable[i].rsn_ie_len; iwe.len = IW_EV_POINT_LEN + iwe.u.data.length; current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe, buf); } if (adapter->scantable[i].wpa_ie[0] == WPA_IE) { memset(&iwe, 0, sizeof(iwe)); memset(buf, 0, sizeof(buf)); memcpy(buf, adapter->scantable[i].wpa_ie, adapter->scantable[i].wpa_ie_len); iwe.cmd = IWEVGENIE; iwe.u.data.length = adapter->scantable[i].wpa_ie_len; iwe.len = IW_EV_POINT_LEN + iwe.u.data.length; current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe, buf); } if (adapter->scantable[i].extra_ie != 0) { memset(&iwe, 0, sizeof(iwe)); memset(buf, 0, sizeof(buf)); ptr = buf; ptr += sprintf(ptr, "extra_ie"); iwe.u.data.length = strlen(buf); lbs_pr_debug(1, "iwe.u.data.length %d\n", iwe.u.data.length); lbs_pr_debug(1, "BUF: %s \n", buf); iwe.cmd = IWEVCUSTOM; iwe.len = IW_EV_POINT_LEN + iwe.u.data.length; current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe, buf); } current_val = current_ev + IW_EV_LCP_LEN; /* * Check if we added any event */ if ((current_val - current_ev) > IW_EV_LCP_LEN) current_ev = current_val; } dwrq->length = (current_ev - extra); dwrq->flags = 0; LEAVE(); return 0; } /** * @brief Prepare a scan command to be sent to the firmware * * Use the wlan_scan_cmd_config sent to the command processing module in * the libertas_prepare_and_send_command to configure a cmd_ds_802_11_scan command * struct to send to firmware. * * The fixed fields specifying the BSS type and BSSID filters as well as a * variable number/length of TLVs are sent in the command to firmware. * * @param priv A pointer to wlan_private structure * @param cmd A pointer to cmd_ds_command structure to be sent to * firmware with the cmd_DS_801_11_SCAN structure * @param pdata_buf Void pointer cast of a wlan_scan_cmd_config struct used * to set the fields/TLVs for the command sent to firmware * * @return 0 or -1 * * @sa wlan_scan_create_channel_list */ int libertas_cmd_80211_scan(wlan_private * priv, struct cmd_ds_command *cmd, void *pdata_buf) { struct cmd_ds_802_11_scan *pscan = &cmd->params.scan; struct wlan_scan_cmd_config *pscancfg; ENTER(); pscancfg = pdata_buf; /* Set fixed field variables in scan command */ pscan->bsstype = pscancfg->bsstype; memcpy(pscan->BSSID, pscancfg->specificBSSID, sizeof(pscan->BSSID)); memcpy(pscan->tlvbuffer, pscancfg->tlvbuffer, pscancfg->tlvbufferlen); cmd->command = cpu_to_le16(cmd_802_11_scan); /* size is equal to the sizeof(fixed portions) + the TLV len + header */ cmd->size = cpu_to_le16(sizeof(pscan->bsstype) + sizeof(pscan->BSSID) + pscancfg->tlvbufferlen + S_DS_GEN); lbs_pr_debug(1, "SCAN_CMD: command=%x, size=%x, seqnum=%x\n", cmd->command, cmd->size, cmd->seqnum); LEAVE(); return 0; } /** * @brief This function handles the command response of scan * * The response buffer for the scan command has the following * memory layout: * * .-----------------------------------------------------------. * | header (4 * sizeof(u16)): Standard command response hdr | * .-----------------------------------------------------------. * | bufsize (u16) : sizeof the BSS Description data | * .-----------------------------------------------------------. * | NumOfSet (u8) : Number of BSS Descs returned | * .-----------------------------------------------------------. * | BSSDescription data (variable, size given in bufsize) | * .-----------------------------------------------------------. * | TLV data (variable, size calculated using header->size, | * | bufsize and sizeof the fixed fields above) | * .-----------------------------------------------------------. * * @param priv A pointer to wlan_private structure * @param resp A pointer to cmd_ds_command * * @return 0 or -1 */ int libertas_ret_80211_scan(wlan_private * priv, struct cmd_ds_command *resp) { wlan_adapter *adapter = priv->adapter; struct cmd_ds_802_11_scan_rsp *pscan; struct bss_descriptor newbssentry; struct mrvlietypes_data *ptlv; struct mrvlietypes_tsftimestamp *ptsftlv; u8 *pbssinfo; u16 scanrespsize; int bytesleft; int numintable; int bssIdx; int idx; int tlvbufsize; u64 tsfval; ENTER(); pscan = &resp->params.scanresp; if (pscan->nr_sets > MRVDRV_MAX_BSSID_LIST) { lbs_pr_debug(1, "SCAN_RESP: Invalid number of AP returned (%d)!!\n", pscan->nr_sets); LEAVE(); return -1; } bytesleft = le16_to_cpu(pscan->bssdescriptsize); lbs_pr_debug(1, "SCAN_RESP: bssdescriptsize %d\n", bytesleft); scanrespsize = le16_to_cpu(resp->size); lbs_pr_debug(1, "SCAN_RESP: returned %d AP before parsing\n", pscan->nr_sets); numintable = adapter->numinscantable; pbssinfo = pscan->bssdesc_and_tlvbuffer; /* The size of the TLV buffer is equal to the entire command response * size (scanrespsize) minus the fixed fields (sizeof()'s), the * BSS Descriptions (bssdescriptsize as bytesLef) and the command * response header (S_DS_GEN) */ tlvbufsize = scanrespsize - (bytesleft + sizeof(pscan->bssdescriptsize) + sizeof(pscan->nr_sets) + S_DS_GEN); ptlv = (struct mrvlietypes_data *) (pscan->bssdesc_and_tlvbuffer + bytesleft); /* Search the TLV buffer space in the scan response for any valid TLVs */ wlan_ret_802_11_scan_get_tlv_ptrs(ptlv, tlvbufsize, &ptsftlv); /* * Process each scan response returned (pscan->nr_sets). Save * the information in the newbssentry and then insert into the * driver scan table either as an update to an existing entry * or as an addition at the end of the table */ for (idx = 0; idx < pscan->nr_sets && bytesleft; idx++) { /* Zero out the newbssentry we are about to store info in */ memset(&newbssentry, 0x00, sizeof(newbssentry)); /* Process the data fields and IEs returned for this BSS */ if ((InterpretBSSDescriptionWithIE(&newbssentry, &pbssinfo, &bytesleft) == 0) && CHECK_SSID_IS_VALID(&newbssentry.ssid)) { lbs_pr_debug(1, "SCAN_RESP: BSSID = %02x:%02x:%02x:%02x:%02x:%02x\n", newbssentry.macaddress[0], newbssentry.macaddress[1], newbssentry.macaddress[2], newbssentry.macaddress[3], newbssentry.macaddress[4], newbssentry.macaddress[5]); /* * Search the scan table for the same bssid */ for (bssIdx = 0; bssIdx < numintable; bssIdx++) { if (memcmp(newbssentry.macaddress, adapter->scantable[bssIdx]. macaddress, sizeof(newbssentry.macaddress)) == 0) { /* * If the SSID matches as well, it is a duplicate of * this entry. Keep the bssIdx set to this * entry so we replace the old contents in the table */ if ((newbssentry.ssid.ssidlength == adapter->scantable[bssIdx].ssid. ssidlength) && (memcmp (newbssentry.ssid.ssid, adapter->scantable[bssIdx].ssid. ssid, newbssentry.ssid.ssidlength) == 0)) { lbs_pr_debug(1, "SCAN_RESP: Duplicate of index: %d\n", bssIdx); break; } } } /* * If the bssIdx is equal to the number of entries in the table, * the new entry was not a duplicate; append it to the scan * table */ if (bssIdx == numintable) { /* Range check the bssIdx, keep it limited to the last entry */ if (bssIdx == MRVDRV_MAX_BSSID_LIST) { bssIdx--; } else { numintable++; } } /* * If the TSF TLV was appended to the scan results, save the * this entries TSF value in the networktsf field. The * networktsf is the firmware's TSF value at the time the * beacon or probe response was received. */ if (ptsftlv) { memcpy(&tsfval, &ptsftlv->tsftable[idx], sizeof(tsfval)); tsfval = le64_to_cpu(tsfval); memcpy(&newbssentry.networktsf, &tsfval, sizeof(newbssentry.networktsf)); } /* Copy the locally created newbssentry to the scan table */ memcpy(&adapter->scantable[bssIdx], &newbssentry, sizeof(adapter->scantable[bssIdx])); } else { /* error parsing/interpreting the scan response, skipped */ lbs_pr_debug(1, "SCAN_RESP: " "InterpretBSSDescriptionWithIE returned ERROR\n"); } } lbs_pr_debug(1, "SCAN_RESP: Scanned %2d APs, %d valid, %d total\n", pscan->nr_sets, numintable - adapter->numinscantable, numintable); /* Update the total number of BSSIDs in the scan table */ adapter->numinscantable = numintable; LEAVE(); return 0; }