diff options
Diffstat (limited to 'package/libertas/src/scan.c')
| -rw-r--r-- | package/libertas/src/scan.c | 1643 |
1 files changed, 1643 insertions, 0 deletions
diff --git a/package/libertas/src/scan.c b/package/libertas/src/scan.c new file mode 100644 index 0000000000..92d84c72e2 --- /dev/null +++ b/package/libertas/src/scan.c @@ -0,0 +1,1643 @@ +/** + * 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 <linux/ctype.h> +#include <linux/if.h> +#include <linux/netdevice.h> +#include <linux/wireless.h> +#include <linux/etherdevice.h> + +#include <net/ieee80211.h> +#include <net/iw_handler.h> + +#include <asm/unaligned.h> + +#include "host.h" +#include "decl.h" +#include "dev.h" +#include "scan.h" +#include "join.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 lbs_scan_cmd_config with all TLVs at max +#define MAX_SCAN_CFG_ALLOC (sizeof(struct lbs_scan_cmd_config) \ + + 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 + +static const u8 zeromac[ETH_ALEN] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; +static const u8 bcastmac[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF }; + + + + +/*********************************************************************/ +/* */ +/* Misc helper functions */ +/* */ +/*********************************************************************/ + +static inline void clear_bss_descriptor (struct bss_descriptor * bss) +{ + /* Don't blow away ->list, just BSS data */ + memset(bss, 0, offsetof(struct bss_descriptor, list)); +} + +/** + * @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 lbs_ssid_cmp(u8 *ssid1, u8 ssid1_len, u8 *ssid2, u8 ssid2_len) +{ + if (ssid1_len != ssid2_len) + return -1; + + return memcmp(ssid1, ssid2, ssid1_len); +} + +static inline int match_bss_no_security(struct lbs_802_11_security *secinfo, + struct bss_descriptor * match_bss) +{ + if ( !secinfo->wep_enabled + && !secinfo->WPAenabled + && !secinfo->WPA2enabled + && match_bss->wpa_ie[0] != MFIE_TYPE_GENERIC + && match_bss->rsn_ie[0] != MFIE_TYPE_RSN + && !(match_bss->capability & WLAN_CAPABILITY_PRIVACY)) { + return 1; + } + return 0; +} + +static inline int match_bss_static_wep(struct lbs_802_11_security *secinfo, + struct bss_descriptor * match_bss) +{ + if ( secinfo->wep_enabled + && !secinfo->WPAenabled + && !secinfo->WPA2enabled + && (match_bss->capability & WLAN_CAPABILITY_PRIVACY)) { + return 1; + } + return 0; +} + +static inline int match_bss_wpa(struct lbs_802_11_security *secinfo, + struct bss_descriptor * match_bss) +{ + if ( !secinfo->wep_enabled + && secinfo->WPAenabled + && (match_bss->wpa_ie[0] == MFIE_TYPE_GENERIC) + /* privacy bit may NOT be set in some APs like LinkSys WRT54G + && (match_bss->capability & WLAN_CAPABILITY_PRIVACY)) { + */ + ) { + return 1; + } + return 0; +} + +static inline int match_bss_wpa2(struct lbs_802_11_security *secinfo, + struct bss_descriptor * match_bss) +{ + if ( !secinfo->wep_enabled + && secinfo->WPA2enabled + && (match_bss->rsn_ie[0] == MFIE_TYPE_RSN) + /* privacy bit may NOT be set in some APs like LinkSys WRT54G + && (match_bss->capability & WLAN_CAPABILITY_PRIVACY)) { + */ + ) { + return 1; + } + return 0; +} + +static inline int match_bss_dynamic_wep(struct lbs_802_11_security *secinfo, + struct bss_descriptor * match_bss) +{ + if ( !secinfo->wep_enabled + && !secinfo->WPAenabled + && !secinfo->WPA2enabled + && (match_bss->wpa_ie[0] != MFIE_TYPE_GENERIC) + && (match_bss->rsn_ie[0] != MFIE_TYPE_RSN) + && (match_bss->capability & WLAN_CAPABILITY_PRIVACY)) { + return 1; + } + return 0; +} + +static inline int is_same_network(struct bss_descriptor *src, + struct bss_descriptor *dst) +{ + /* A network is only a duplicate if the channel, BSSID, and ESSID + * all match. We treat all <hidden> with the same BSSID and channel + * as one network */ + return ((src->ssid_len == dst->ssid_len) && + (src->channel == dst->channel) && + !compare_ether_addr(src->bssid, dst->bssid) && + !memcmp(src->ssid, dst->ssid, src->ssid_len)); +} + +/** + * @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 priv A pointer to struct lbs_private + * @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(struct lbs_private *priv, + struct bss_descriptor * bss, u8 mode) +{ + int matched = 0; + + lbs_deb_enter(LBS_DEB_SCAN); + + if (bss->mode != mode) + goto done; + + if ((matched = match_bss_no_security(&priv->secinfo, bss))) { + goto done; + } else if ((matched = match_bss_static_wep(&priv->secinfo, bss))) { + goto done; + } else if ((matched = match_bss_wpa(&priv->secinfo, bss))) { + lbs_deb_scan( + "is_network_compatible() WPA: wpa_ie 0x%x " + "wpa2_ie 0x%x WEP %s WPA %s WPA2 %s " + "privacy 0x%x\n", bss->wpa_ie[0], bss->rsn_ie[0], + priv->secinfo.wep_enabled ? "e" : "d", + priv->secinfo.WPAenabled ? "e" : "d", + priv->secinfo.WPA2enabled ? "e" : "d", + (bss->capability & WLAN_CAPABILITY_PRIVACY)); + goto done; + } else if ((matched = match_bss_wpa2(&priv->secinfo, bss))) { + lbs_deb_scan( + "is_network_compatible() WPA2: wpa_ie 0x%x " + "wpa2_ie 0x%x WEP %s WPA %s WPA2 %s " + "privacy 0x%x\n", bss->wpa_ie[0], bss->rsn_ie[0], + priv->secinfo.wep_enabled ? "e" : "d", + priv->secinfo.WPAenabled ? "e" : "d", + priv->secinfo.WPA2enabled ? "e" : "d", + (bss->capability & WLAN_CAPABILITY_PRIVACY)); + goto done; + } else if ((matched = match_bss_dynamic_wep(&priv->secinfo, bss))) { + lbs_deb_scan( + "is_network_compatible() dynamic WEP: " + "wpa_ie 0x%x wpa2_ie 0x%x privacy 0x%x\n", + bss->wpa_ie[0], bss->rsn_ie[0], + (bss->capability & WLAN_CAPABILITY_PRIVACY)); + goto done; + } + + /* bss security settings don't match those configured on card */ + lbs_deb_scan( + "is_network_compatible() FAILED: wpa_ie 0x%x " + "wpa2_ie 0x%x WEP %s WPA %s WPA2 %s privacy 0x%x\n", + bss->wpa_ie[0], bss->rsn_ie[0], + priv->secinfo.wep_enabled ? "e" : "d", + priv->secinfo.WPAenabled ? "e" : "d", + priv->secinfo.WPA2enabled ? "e" : "d", + (bss->capability & WLAN_CAPABILITY_PRIVACY)); + +done: + lbs_deb_leave_args(LBS_DEB_SCAN, "matched: %d", matched); + return matched; +} + + + + +/*********************************************************************/ +/* */ +/* Main scanning support */ +/* */ +/*********************************************************************/ + +void lbs_scan_worker(struct work_struct *work) +{ + struct lbs_private *priv = + container_of(work, struct lbs_private, scan_work.work); + + lbs_deb_enter(LBS_DEB_SCAN); + lbs_scan_networks(priv, NULL, 0); + lbs_deb_leave(LBS_DEB_SCAN); +} + + +/** + * @brief Create a channel list for the driver to scan based on region info + * + * Only used from lbs_scan_setup_scan_config() + * + * 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 struct lbs_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 int lbs_scan_create_channel_list(struct lbs_private *priv, + struct chanscanparamset * scanchanlist, + u8 filteredscan) +{ + + 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 = CMD_SCAN_TYPE_ACTIVE; + + for (rgnidx = 0; rgnidx < ARRAY_SIZE(priv->region_channel); rgnidx++) { + if (priv->enable11d && + (priv->connect_status != LBS_CONNECTED) && + (priv->mesh_connect_status != LBS_CONNECTED)) { + /* Scan all the supported chan for the first scan */ + if (!priv->universal_channel[rgnidx].valid) + continue; + scanregion = &priv->universal_channel[rgnidx]; + + /* clear the parsed_region_chan for the first scan */ + memset(&priv->parsed_region_chan, 0x00, + sizeof(priv->parsed_region_chan)); + } else { + if (!priv->region_channel[rgnidx].valid) + continue; + scanregion = &priv->region_channel[rgnidx]; + } + + for (nextchan = 0; + nextchan < scanregion->nrcfp; nextchan++, chanidx++) { + + cfp = scanregion->CFP + nextchan; + + if (priv->enable11d) { + scantype = + lbs_get_scan_type_11d(cfp->channel, + &priv-> + 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; + } + } + } + return chanidx; +} + + +/* + * Add SSID TLV of the form: + * + * TLV-ID SSID 00 00 + * length 06 00 + * ssid 4d 4e 54 45 53 54 + */ +static int lbs_scan_add_ssid_tlv(u8 *tlv, + const struct lbs_ioctl_user_scan_cfg *user_cfg) +{ + struct mrvlietypes_ssidparamset *ssid_tlv = + (struct mrvlietypes_ssidparamset *)tlv; + ssid_tlv->header.type = cpu_to_le16(TLV_TYPE_SSID); + ssid_tlv->header.len = cpu_to_le16(user_cfg->ssid_len); + memcpy(ssid_tlv->ssid, user_cfg->ssid, user_cfg->ssid_len); + return sizeof(ssid_tlv->header) + user_cfg->ssid_len; +} + + +/* + * Add CHANLIST TLV of the form + * + * TLV-ID CHANLIST 01 01 + * length 5b 00 + * channel 1 00 01 00 00 00 64 00 + * radio type 00 + * channel 01 + * scan type 00 + * min scan time 00 00 + * max scan time 64 00 + * channel 2 00 02 00 00 00 64 00 + * channel 3 00 03 00 00 00 64 00 + * channel 4 00 04 00 00 00 64 00 + * channel 5 00 05 00 00 00 64 00 + * channel 6 00 06 00 00 00 64 00 + * channel 7 00 07 00 00 00 64 00 + * channel 8 00 08 00 00 00 64 00 + * channel 9 00 09 00 00 00 64 00 + * channel 10 00 0a 00 00 00 64 00 + * channel 11 00 0b 00 00 00 64 00 + * channel 12 00 0c 00 00 00 64 00 + * channel 13 00 0d 00 00 00 64 00 + * + */ +static int lbs_scan_add_chanlist_tlv(u8 *tlv, + struct chanscanparamset *chan_list, + int chan_count) +{ + size_t size = sizeof(struct chanscanparamset) * chan_count; + struct mrvlietypes_chanlistparamset *chan_tlv = + (struct mrvlietypes_chanlistparamset *) tlv; + + chan_tlv->header.type = cpu_to_le16(TLV_TYPE_CHANLIST); + memcpy(chan_tlv->chanscanparam, chan_list, size); + chan_tlv->header.len = cpu_to_le16(size); + return sizeof(chan_tlv->header) + size; +} + + +/* + * Add RATES TLV of the form + * + * TLV-ID RATES 01 00 + * length 0e 00 + * rates 82 84 8b 96 0c 12 18 24 30 48 60 6c + * + * The rates are in lbs_bg_rates[], but for the 802.11b + * rates the high bit isn't set. + */ +static int lbs_scan_add_rates_tlv(u8 *tlv) +{ + int i; + struct mrvlietypes_ratesparamset *rate_tlv = + (struct mrvlietypes_ratesparamset *) tlv; + + rate_tlv->header.type = cpu_to_le16(TLV_TYPE_RATES); + tlv += sizeof(rate_tlv->header); + for (i = 0; i < MAX_RATES; i++) { + *tlv = lbs_bg_rates[i]; + if (*tlv == 0) + break; + /* This code makes sure that the 802.11b rates (1 MBit/s, 2 + MBit/s, 5.5 MBit/s and 11 MBit/s get's the high bit set. + Note that the values are MBit/s * 2, to mark them as + basic rates so that the firmware likes it better */ + if (*tlv == 0x02 || *tlv == 0x04 || + *tlv == 0x0b || *tlv == 0x16) + *tlv |= 0x80; + tlv++; + } + rate_tlv->header.len = cpu_to_le16(i); + return sizeof(rate_tlv->header) + i; +} + + +/* + * Generate the CMD_802_11_SCAN command with the proper tlv + * for a bunch of channels. + */ +static int lbs_do_scan(struct lbs_private *priv, + u8 bsstype, + struct chanscanparamset *chan_list, + int chan_count, + const struct lbs_ioctl_user_scan_cfg *user_cfg) +{ + int ret = -ENOMEM; + struct lbs_scan_cmd_config *scan_cmd; + u8 *tlv; /* pointer into our current, growing TLV storage area */ + + lbs_deb_enter_args(LBS_DEB_SCAN, "bsstype %d, chanlist[].chan %d, " + "chan_count %d", + bsstype, chan_list[0].channumber, chan_count); + + /* create the fixed part for scan command */ + scan_cmd = kzalloc(MAX_SCAN_CFG_ALLOC, GFP_KERNEL); + if (scan_cmd == NULL) + goto out; + tlv = scan_cmd->tlvbuffer; + if (user_cfg) + memcpy(scan_cmd->bssid, user_cfg->bssid, ETH_ALEN); + scan_cmd->bsstype = bsstype; + + /* add TLVs */ + if (user_cfg && user_cfg->ssid_len) + tlv += lbs_scan_add_ssid_tlv(tlv, user_cfg); + if (chan_list && chan_count) + tlv += lbs_scan_add_chanlist_tlv(tlv, chan_list, chan_count); + tlv += lbs_scan_add_rates_tlv(tlv); + + /* This is the final data we are about to send */ + scan_cmd->tlvbufferlen = tlv - scan_cmd->tlvbuffer; + lbs_deb_hex(LBS_DEB_SCAN, "SCAN_CMD", (void *)scan_cmd, 1+6); + lbs_deb_hex(LBS_DEB_SCAN, "SCAN_TLV", scan_cmd->tlvbuffer, + scan_cmd->tlvbufferlen); + + ret = lbs_prepare_and_send_command(priv, CMD_802_11_SCAN, 0, + CMD_OPTION_WAITFORRSP, 0, scan_cmd); +out: + kfree(scan_cmd); + lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret); + return ret; +} + + +/** + * @brief Internal function used to start a scan based on an input config + * + * Also used from debugfs + * + * 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 struct lbs_private structure + * @param puserscanin Pointer to the input configuration for the requested + * scan. + * + * @return 0 or < 0 if error + */ +int lbs_scan_networks(struct lbs_private *priv, + const struct lbs_ioctl_user_scan_cfg *user_cfg, + int full_scan) +{ + int ret = -ENOMEM; + struct chanscanparamset *chan_list; + struct chanscanparamset *curr_chans; + int chan_count; + u8 bsstype = CMD_BSS_TYPE_ANY; + int numchannels = MRVDRV_CHANNELS_PER_SCAN_CMD; + int filteredscan = 0; + union iwreq_data wrqu; +#ifdef CONFIG_LIBERTAS_DEBUG + struct bss_descriptor *iter; + int i = 0; + DECLARE_MAC_BUF(mac); +#endif + + lbs_deb_enter_args(LBS_DEB_SCAN, "full_scan %d", + full_scan); + + /* Cancel any partial outstanding partial scans if this scan + * is a full scan. + */ + if (full_scan && delayed_work_pending(&priv->scan_work)) + cancel_delayed_work(&priv->scan_work); + + /* Determine same scan parameters */ + if (user_cfg) { + if (user_cfg->bsstype) + bsstype = user_cfg->bsstype; + if (compare_ether_addr(user_cfg->bssid, &zeromac[0]) != 0) { + numchannels = MRVDRV_MAX_CHANNELS_PER_SCAN; + filteredscan = 1; + } + } + lbs_deb_scan("numchannels %d, bsstype %d, " + "filteredscan %d\n", + numchannels, bsstype, filteredscan); + + /* Create list of channels to scan */ + chan_list = kzalloc(sizeof(struct chanscanparamset) * + LBS_IOCTL_USER_SCAN_CHAN_MAX, GFP_KERNEL); + if (!chan_list) { + lbs_pr_alert("SCAN: chan_list empty\n"); + goto out; + } + + /* We want to scan all channels */ + chan_count = lbs_scan_create_channel_list(priv, chan_list, + filteredscan); + + netif_stop_queue(priv->dev); + netif_carrier_off(priv->dev); + if (priv->mesh_dev) { + netif_stop_queue(priv->mesh_dev); + netif_carrier_off(priv->mesh_dev); + } + + /* Prepare to continue an interrupted scan */ + lbs_deb_scan("chan_count %d, last_scanned_channel %d\n", + chan_count, priv->last_scanned_channel); + curr_chans = chan_list; + /* advance channel list by already-scanned-channels */ + if (priv->last_scanned_channel > 0) { + curr_chans += priv->last_scanned_channel; + chan_count -= priv->last_scanned_channel; + } + + /* Send scan command(s) + * numchannels contains the number of channels we should maximally scan + * chan_count is the total number of channels to scan + */ + + while (chan_count) { + int to_scan = min(numchannels, chan_count); + lbs_deb_scan("scanning %d of %d channels\n", + to_scan, chan_count); + ret = lbs_do_scan(priv, bsstype, curr_chans, + to_scan, user_cfg); + if (ret) { + lbs_pr_err("SCAN_CMD failed\n"); + goto out2; + } + curr_chans += to_scan; + chan_count -= to_scan; + + /* somehow schedule the next part of the scan */ + if (chan_count && + !full_scan && + !priv->surpriseremoved) { + /* -1 marks just that we're currently scanning */ + if (priv->last_scanned_channel < 0) + priv->last_scanned_channel = to_scan; + else + priv->last_scanned_channel += to_scan; + cancel_delayed_work(&priv->scan_work); + queue_delayed_work(priv->work_thread, &priv->scan_work, + msecs_to_jiffies(300)); + /* skip over GIWSCAN event */ + goto out; + } + + } + memset(&wrqu, 0, sizeof(union iwreq_data)); + wireless_send_event(priv->dev, SIOCGIWSCAN, &wrqu, NULL); + +#ifdef CONFIG_LIBERTAS_DEBUG + /* Dump the scan table */ + mutex_lock(&priv->lock); + lbs_deb_scan("scan table:\n"); + list_for_each_entry(iter, &priv->network_list, list) + lbs_deb_scan("%02d: BSSID %s, RSSI %d, SSID '%s'\n", + i++, print_mac(mac, iter->bssid), (s32) iter->rssi, + escape_essid(iter->ssid, iter->ssid_len)); + mutex_unlock(&priv->lock); +#endif + +out2: + priv->last_scanned_channel = 0; + +out: + if (priv->connect_status == LBS_CONNECTED) { + netif_carrier_on(priv->dev); + netif_wake_queue(priv->dev); + } + if (priv->mesh_dev && (priv->mesh_connect_status == LBS_CONNECTED)) { + netif_carrier_on(priv->mesh_dev); + netif_wake_queue(priv->mesh_dev); + } + kfree(chan_list); + + lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret); + return ret; +} + + + + +/*********************************************************************/ +/* */ +/* Result interpretation */ +/* */ +/*********************************************************************/ + +/** + * @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 bss Output parameter: Pointer to the BSS Entry + * + * @return 0 or -1 + */ +static int lbs_process_bss(struct bss_descriptor *bss, + u8 ** pbeaconinfo, int *bytesleft) +{ + struct ieeetypes_fhparamset *pFH; + struct ieeetypes_dsparamset *pDS; + struct ieeetypes_cfparamset *pCF; + struct ieeetypes_ibssparamset *pibss; + DECLARE_MAC_BUF(mac); + struct ieeetypes_countryinfoset *pcountryinfo; + u8 *pos, *end, *p; + u8 n_ex_rates = 0, got_basic_rates = 0, n_basic_rates = 0; + u16 beaconsize = 0; + int ret; + + lbs_deb_enter(LBS_DEB_SCAN); + + if (*bytesleft >= sizeof(beaconsize)) { + /* Extract & convert beacon size from the command buffer */ + beaconsize = le16_to_cpu(get_unaligned((__le16 *)*pbeaconinfo)); + *bytesleft -= sizeof(beaconsize); + *pbeaconinfo += sizeof(beaconsize); + } + + if (beaconsize == 0 || beaconsize > *bytesleft) { + *pbeaconinfo += *bytesleft; + *bytesleft = 0; + ret = -1; + goto done; + } + + /* Initialize the current working beacon pointer for this BSS iteration */ + pos = *pbeaconinfo; + end = pos + beaconsize; + + /* Advance the return beacon pointer past the current beacon */ + *pbeaconinfo += beaconsize; + *bytesleft -= beaconsize; + + memcpy(bss->bssid, pos, ETH_ALEN); + lbs_deb_scan("process_bss: BSSID %s\n", print_mac(mac, bss->bssid)); + pos += ETH_ALEN; + + if ((end - pos) < 12) { + lbs_deb_scan("process_bss: Not enough bytes left\n"); + ret = -1; + goto done; + } + + /* + * next 4 fields are RSSI, time stamp, beacon interval, + * and capability information + */ + + /* RSSI is 1 byte long */ + bss->rssi = *pos; + lbs_deb_scan("process_bss: RSSI %d\n", *pos); + pos++; + + /* time stamp is 8 bytes long */ + pos += 8; + + /* beacon interval is 2 bytes long */ + bss->beaconperiod = le16_to_cpup((void *) pos); + pos += 2; + + /* capability information is 2 bytes long */ + bss->capability = le16_to_cpup((void *) pos); + lbs_deb_scan("process_bss: capabilities 0x%04x\n", bss->capability); + pos += 2; + + if (bss->capability & WLAN_CAPABILITY_PRIVACY) + lbs_deb_scan("process_bss: WEP enabled\n"); + if (bss->capability & WLAN_CAPABILITY_IBSS) + bss->mode = IW_MODE_ADHOC; + else + bss->mode = IW_MODE_INFRA; + + /* rest of the current buffer are IE's */ + lbs_deb_scan("process_bss: IE len %zd\n", end - pos); + lbs_deb_hex(LBS_DEB_SCAN, "process_bss: IE info", pos, end - pos); + + /* process variable IE */ + while (pos <= end - 2) { + struct ieee80211_info_element * elem = + (struct ieee80211_info_element *) pos; + + if (pos + elem->len > end) { + lbs_deb_scan("process_bss: error in processing IE, " + "bytes left < IE length\n"); + break; + } + + switch (elem->id) { + case MFIE_TYPE_SSID: + bss->ssid_len = elem->len; + memcpy(bss->ssid, elem->data, elem->len); + lbs_deb_scan("got SSID IE: '%s', len %u\n", + escape_essid(bss->ssid, bss->ssid_len), + bss->ssid_len); + break; + + case MFIE_TYPE_RATES: + n_basic_rates = min_t(u8, MAX_RATES, elem->len); + memcpy(bss->rates, elem->data, n_basic_rates); + got_basic_rates = 1; + lbs_deb_scan("got RATES IE\n"); + break; + + case MFIE_TYPE_FH_SET: + pFH = (struct ieeetypes_fhparamset *) pos; + memmove(&bss->phyparamset.fhparamset, pFH, + sizeof(struct ieeetypes_fhparamset)); + lbs_deb_scan("got FH IE\n"); + break; + + case MFIE_TYPE_DS_SET: + pDS = (struct ieeetypes_dsparamset *) pos; + bss->channel = pDS->currentchan; + memcpy(&bss->phyparamset.dsparamset, pDS, + sizeof(struct ieeetypes_dsparamset)); + lbs_deb_scan("got DS IE, channel %d\n", bss->channel); + break; + + case MFIE_TYPE_CF_SET: + pCF = (struct ieeetypes_cfparamset *) pos; + memcpy(&bss->ssparamset.cfparamset, pCF, + sizeof(struct ieeetypes_cfparamset)); + lbs_deb_scan("got CF IE\n"); + break; + + case MFIE_TYPE_IBSS_SET: + pibss = (struct ieeetypes_ibssparamset *) pos; + bss->atimwindow = le16_to_cpu(pibss->atimwindow); + memmove(&bss->ssparamset.ibssparamset, pibss, + sizeof(struct ieeetypes_ibssparamset)); + lbs_deb_scan("got IBSS IE\n"); + break; + + case MFIE_TYPE_COUNTRY: + pcountryinfo = (struct ieeetypes_countryinfoset *) pos; + lbs_deb_scan("got COUNTRY IE\n"); + if (pcountryinfo->len < sizeof(pcountryinfo->countrycode) + || pcountryinfo->len > 254) { + lbs_deb_scan("process_bss: 11D- Err " + "CountryInfo len %d, min %zd, max 254\n", + pcountryinfo->len, + sizeof(pcountryinfo->countrycode)); + ret = -1; + goto done; + } + + memcpy(&bss->countryinfo, + pcountryinfo, pcountryinfo->len + 2); + lbs_deb_hex(LBS_DEB_SCAN, "process_bss: 11d countryinfo", + (u8 *) pcountryinfo, + (u32) (pcountryinfo->len + 2)); + break; + + case MFIE_TYPE_RATES_EX: + /* only process extended supported rate if data rate is + * already found. Data rate IE should come before + * extended supported rate IE + */ + lbs_deb_scan("got RATESEX IE\n"); + if (!got_basic_rates) { + lbs_deb_scan("... but ignoring it\n"); + break; + } + + n_ex_rates = elem->len; + if (n_basic_rates + n_ex_rates > MAX_RATES) + n_ex_rates = MAX_RATES - n_basic_rates; + + p = bss->rates + n_basic_rates; + memcpy(p, elem->data, n_ex_rates); + break; + + case MFIE_TYPE_GENERIC: + if (elem->len >= 4 && + elem->data[0] == 0x00 && + elem->data[1] == 0x50 && + elem->data[2] == 0xf2 && + elem->data[3] == 0x01) { + bss->wpa_ie_len = min(elem->len + 2, + MAX_WPA_IE_LEN); + memcpy(bss->wpa_ie, elem, bss->wpa_ie_len); + lbs_deb_scan("got WPA IE\n"); + lbs_deb_hex(LBS_DEB_SCAN, "WPA IE", bss->wpa_ie, + elem->len); + } else if (elem->len >= MARVELL_MESH_IE_LENGTH && + elem->data[0] == 0x00 && + elem->data[1] == 0x50 && + elem->data[2] == 0x43 && + elem->data[3] == 0x04) { + lbs_deb_scan("got mesh IE\n"); + bss->mesh = 1; + } else { + lbs_deb_scan("got generiec IE: " + "%02x:%02x:%02x:%02x, len %d\n", + elem->data[0], elem->data[1], + elem->data[2], elem->data[3], + elem->len); + } + break; + + case MFIE_TYPE_RSN: + lbs_deb_scan("got RSN IE\n"); + bss->rsn_ie_len = min(elem->len + 2, MAX_WPA_IE_LEN); + memcpy(bss->rsn_ie, elem, bss->rsn_ie_len); + lbs_deb_hex(LBS_DEB_SCAN, "process_bss: RSN_IE", + bss->rsn_ie, elem->len); + break; + + default: + lbs_deb_scan("got IE 0x%04x, len %d\n", + elem->id, elem->len); + break; + } + + pos += elem->len + 2; + } + + /* Timestamp */ + bss->last_scanned = jiffies; + lbs_unset_basic_rate_flags(bss->rates, sizeof(bss->rates)); + + ret = 0; + +done: + lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret); + return ret; +} + +/** + * @brief This function finds a specific compatible BSSID in the scan list + * + * Used in association code + * + * @param priv A pointer to struct lbs_private + * @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) + */ +struct bss_descriptor *lbs_find_bssid_in_list(struct lbs_private *priv, + u8 * bssid, u8 mode) +{ + struct bss_descriptor * iter_bss; + struct bss_descriptor * found_bss = NULL; + + lbs_deb_enter(LBS_DEB_SCAN); + + if (!bssid) + goto out; + + lbs_deb_hex(LBS_DEB_SCAN, "looking for", + bssid, ETH_ALEN); + + /* Look through the scan table for a compatible match. 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 + */ + mutex_lock(&priv->lock); + list_for_each_entry (iter_bss, &priv->network_list, list) { + if (compare_ether_addr(iter_bss->bssid, bssid)) + continue; /* bssid doesn't match */ + switch (mode) { + case IW_MODE_INFRA: + case IW_MODE_ADHOC: + if (!is_network_compatible(priv, iter_bss, mode)) + break; + found_bss = iter_bss; + break; + default: + found_bss = iter_bss; + break; + } + } + mutex_unlock(&priv->lock); + +out: + lbs_deb_leave_args(LBS_DEB_SCAN, "found_bss %p", found_bss); + return found_bss; +} + +/** + * @brief This function finds ssid in ssid list. + * + * Used in association code + * + * @param priv A pointer to struct lbs_private + * @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 + */ +struct bss_descriptor *lbs_find_ssid_in_list(struct lbs_private *priv, + u8 *ssid, u8 ssid_len, u8 * bssid, u8 mode, + int channel) +{ + u8 bestrssi = 0; + struct bss_descriptor * iter_bss = NULL; + struct bss_descriptor * found_bss = NULL; + struct bss_descriptor * tmp_oldest = NULL; + + lbs_deb_enter(LBS_DEB_SCAN); + + mutex_lock(&priv->lock); + + list_for_each_entry (iter_bss, &priv->network_list, list) { + if ( !tmp_oldest + || (iter_bss->last_scanned < tmp_oldest->last_scanned)) + tmp_oldest = iter_bss; + + if (lbs_ssid_cmp(iter_bss->ssid, iter_bss->ssid_len, + ssid, ssid_len) != 0) + continue; /* ssid doesn't match */ + if (bssid && compare_ether_addr(iter_bss->bssid, bssid) != 0) + continue; /* bssid doesn't match */ + if ((channel > 0) && (iter_bss->channel != channel)) + continue; /* channel doesn't match */ + + switch (mode) { + case IW_MODE_INFRA: + case IW_MODE_ADHOC: + if (!is_network_compatible(priv, iter_bss, mode)) + break; + + if (bssid) { + /* Found requested BSSID */ + found_bss = iter_bss; + goto out; + } + + if (SCAN_RSSI(iter_bss->rssi) > bestrssi) { + bestrssi = SCAN_RSSI(iter_bss->rssi); + found_bss = iter_bss; + } + break; + case IW_MODE_AUTO: + default: + if (SCAN_RSSI(iter_bss->rssi) > bestrssi) { + bestrssi = SCAN_RSSI(iter_bss->rssi); + found_bss = iter_bss; + } + break; + } + } + +out: + mutex_unlock(&priv->lock); + lbs_deb_leave_args(LBS_DEB_SCAN, "found_bss %p", found_bss); + return found_bss; +} + +/** + * @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 priv A pointer to struct lbs_private + * + * @return index in BSSID list + */ +static struct bss_descriptor *lbs_find_best_ssid_in_list( + struct lbs_private *priv, + u8 mode) +{ + u8 bestrssi = 0; + struct bss_descriptor * iter_bss; + struct bss_descriptor * best_bss = NULL; + + lbs_deb_enter(LBS_DEB_SCAN); + + mutex_lock(&priv->lock); + + list_for_each_entry (iter_bss, &priv->network_list, list) { + switch (mode) { + case IW_MODE_INFRA: + case IW_MODE_ADHOC: + if (!is_network_compatible(priv, iter_bss, mode)) + break; + if (SCAN_RSSI(iter_bss->rssi) <= bestrssi) + break; + bestrssi = SCAN_RSSI(iter_bss->rssi); + best_bss = iter_bss; + break; + case IW_MODE_AUTO: + default: + if (SCAN_RSSI(iter_bss->rssi) <= bestrssi) + break; + bestrssi = SCAN_RSSI(iter_bss->rssi); + best_bss = iter_bss; + break; + } + } + + mutex_unlock(&priv->lock); + lbs_deb_leave_args(LBS_DEB_SCAN, "best_bss %p", best_bss); + return best_bss; +} + +/** + * @brief Find the AP with specific ssid in the scan list + * + * Used from association worker. + * + * @param priv A pointer to struct lbs_private structure + * @param pSSID A pointer to AP's ssid + * + * @return 0--success, otherwise--fail + */ +int lbs_find_best_network_ssid(struct lbs_private *priv, + u8 *out_ssid, u8 *out_ssid_len, u8 preferred_mode, u8 *out_mode) +{ + int ret = -1; + struct bss_descriptor * found; + + lbs_deb_enter(LBS_DEB_SCAN); + + lbs_scan_networks(priv, NULL, 1); + if (priv->surpriseremoved) + goto out; + + found = lbs_find_best_ssid_in_list(priv, preferred_mode); + if (found && (found->ssid_len > 0)) { + memcpy(out_ssid, &found->ssid, IW_ESSID_MAX_SIZE); + *out_ssid_len = found->ssid_len; + *out_mode = found->mode; + ret = 0; + } + +out: + lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret); + return ret; +} + + +/** + * @brief Send a scan command for all available channels filtered on a spec + * + * Used in association code and from debugfs + * + * @param priv A pointer to struct lbs_private structure + * @param ssid A pointer to the SSID to scan for + * @param ssid_len Length of the SSID + * @param clear_ssid Should existing scan results with this SSID + * be cleared? + * + * @return 0-success, otherwise fail + */ +int lbs_send_specific_ssid_scan(struct lbs_private *priv, + u8 *ssid, u8 ssid_len, u8 clear_ssid) +{ + struct lbs_ioctl_user_scan_cfg scancfg; + int ret = 0; + + lbs_deb_enter_args(LBS_DEB_SCAN, "SSID '%s', clear %d", + escape_essid(ssid, ssid_len), clear_ssid); + + if (!ssid_len) + goto out; + + memset(&scancfg, 0x00, sizeof(scancfg)); + memcpy(scancfg.ssid, ssid, ssid_len); + scancfg.ssid_len = ssid_len; + scancfg.clear_ssid = clear_ssid; + + lbs_scan_networks(priv, &scancfg, 1); + if (priv->surpriseremoved) { + ret = -1; + goto out; + } + +out: + lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret); + return ret; +} + + + + +/*********************************************************************/ +/* */ +/* Support for Wireless Extensions */ +/* */ +/*********************************************************************/ + + +#define MAX_CUSTOM_LEN 64 + +static inline char *lbs_translate_scan(struct lbs_private *priv, + char *start, char *stop, + struct bss_descriptor *bss) +{ + struct chan_freq_power *cfp; + char *current_val; /* For rates */ + struct iw_event iwe; /* Temporary buffer */ + int j; +#define PERFECT_RSSI ((u8)50) +#define WORST_RSSI ((u8)0) +#define RSSI_DIFF ((u8)(PERFECT_RSSI - WORST_RSSI)) + u8 rssi; + + lbs_deb_enter(LBS_DEB_SCAN); + + cfp = lbs_find_cfp_by_band_and_channel(priv, 0, bss->channel); + if (!cfp) { + lbs_deb_scan("Invalid channel number %d\n", bss->channel); + start = NULL; + goto out; + } + + /* First entry *MUST* be the BSSID */ + iwe.cmd = SIOCGIWAP; + iwe.u.ap_addr.sa_family = ARPHRD_ETHER; + memcpy(iwe.u.ap_addr.sa_data, &bss->bssid, ETH_ALEN); + start = iwe_stream_add_event(start, stop, &iwe, IW_EV_ADDR_LEN); + + /* SSID */ + iwe.cmd = SIOCGIWESSID; + iwe.u.data.flags = 1; + iwe.u.data.length = min((u32) bss->ssid_len, (u32) IW_ESSID_MAX_SIZE); + start = iwe_stream_add_point(start, stop, &iwe, bss->ssid); + + /* Mode */ + iwe.cmd = SIOCGIWMODE; + iwe.u.mode = bss->mode; + start = iwe_stream_add_event(start, stop, &iwe, IW_EV_UINT_LEN); + + /* Frequency */ + iwe.cmd = SIOCGIWFREQ; + iwe.u.freq.m = (long)cfp->freq * 100000; + iwe.u.freq.e = 1; + start = iwe_stream_add_event(start, stop, &iwe, IW_EV_FREQ_LEN); + + /* Add quality statistics */ + iwe.cmd = IWEVQUAL; + iwe.u.qual.updated = IW_QUAL_ALL_UPDATED; + iwe.u.qual.level = SCAN_RSSI(bss->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; + + if (priv->NF[TYPE_BEACON][TYPE_NOAVG] == 0) { + iwe.u.qual.noise = MRVDRV_NF_DEFAULT_SCAN_VALUE; + } else { + iwe.u.qual.noise = + CAL_NF(priv->NF[TYPE_BEACON][TYPE_NOAVG]); + } + + /* Locally created ad-hoc BSSs won't have beacons if this is the + * only station in the adhoc network; so get signal strength + * from receive statistics. + */ + if ((priv->mode == IW_MODE_ADHOC) + && priv->adhoccreate + && !lbs_ssid_cmp(priv->curbssparams.ssid, + priv->curbssparams.ssid_len, + bss->ssid, bss->ssid_len)) { + int snr, nf; + snr = priv->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE; + nf = priv->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE; + iwe.u.qual.level = CAL_RSSI(snr, nf); + } + start = iwe_stream_add_event(start, stop, &iwe, IW_EV_QUAL_LEN); + + /* Add encryption capability */ + iwe.cmd = SIOCGIWENCODE; + if (bss->capability & WLAN_CAPABILITY_PRIVACY) { + iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; + } else { + iwe.u.data.flags = IW_ENCODE_DISABLED; + } + iwe.u.data.length = 0; + start = iwe_stream_add_point(start, stop, &iwe, bss->ssid); + + current_val = start + IW_EV_LCP_LEN; + + iwe.cmd = SIOCGIWRATE; + iwe.u.bitrate.fixed = 0; + iwe.u.bitrate.disabled = 0; + iwe.u.bitrate.value = 0; + + for (j = 0; bss->rates[j] && (j < sizeof(bss->rates)); j++) { + /* Bit rate given in 500 kb/s units */ + iwe.u.bitrate.value = bss->rates[j] * 500000; + current_val = iwe_stream_add_value(start, current_val, + stop, &iwe, IW_EV_PARAM_LEN); + } + if ((bss->mode == IW_MODE_ADHOC) + && !lbs_ssid_cmp(priv->curbssparams.ssid, + priv->curbssparams.ssid_len, + bss->ssid, bss->ssid_len) + && priv->adhoccreate) { + iwe.u.bitrate.value = 22 * 500000; + current_val = iwe_stream_add_value(start, current_val, + stop, &iwe, IW_EV_PARAM_LEN); + } + /* Check if we added any event */ + if((current_val - start) > IW_EV_LCP_LEN) + start = current_val; + + memset(&iwe, 0, sizeof(iwe)); + if (bss->wpa_ie_len) { + char buf[MAX_WPA_IE_LEN]; + memcpy(buf, bss->wpa_ie, bss->wpa_ie_len); + iwe.cmd = IWEVGENIE; + iwe.u.data.length = bss->wpa_ie_len; + start = iwe_stream_add_point(start, stop, &iwe, buf); + } + + memset(&iwe, 0, sizeof(iwe)); + if (bss->rsn_ie_len) { + char buf[MAX_WPA_IE_LEN]; + memcpy(buf, bss->rsn_ie, bss->rsn_ie_len); + iwe.cmd = IWEVGENIE; + iwe.u.data.length = bss->rsn_ie_len; + start = iwe_stream_add_point(start, stop, &iwe, buf); + } + + if (bss->mesh) { + char custom[MAX_CUSTOM_LEN]; + char *p = custom; + + iwe.cmd = IWEVCUSTOM; + p += snprintf(p, MAX_CUSTOM_LEN - (p - custom), + "mesh-type: olpc"); + iwe.u.data.length = p - custom; + if (iwe.u.data.length) + start = iwe_stream_add_point(start, stop, &iwe, custom); + } + +out: + lbs_deb_leave_args(LBS_DEB_SCAN, "start %p", start); + return start; +} + + +/** + * @brief Handle Scan Network ioctl + * + * @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 lbs_set_scan(struct net_device *dev, struct iw_request_info *info, + struct iw_param *wrqu, char *extra) +{ + struct lbs_private *priv = dev->priv; + + lbs_deb_enter(LBS_DEB_SCAN); + + if (!netif_running(dev)) + return -ENETDOWN; + + /* mac80211 does this: + struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); + if (sdata->type != IEEE80211_IF_TYPE_xxx) + return -EOPNOTSUPP; + + if (wrqu->data.length == sizeof(struct iw_scan_req) && + wrqu->data.flags & IW_SCAN_THIS_ESSID) { + req = (struct iw_scan_req *)extra; + ssid = req->essid; + ssid_len = req->essid_len; + } + */ + + if (!delayed_work_pending(&priv->scan_work)) + queue_delayed_work(priv->work_thread, &priv->scan_work, + msecs_to_jiffies(50)); + /* set marker that currently a scan is taking place */ + priv->last_scanned_channel = -1; + + if (priv->surpriseremoved) + return -EIO; + + lbs_deb_leave(LBS_DEB_SCAN); + return 0; +} + + +/** + * @brief Handle Retrieve scan table ioctl + * + * @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 lbs_get_scan(struct net_device *dev, struct iw_request_info *info, + struct iw_point *dwrq, char *extra) +{ +#define SCAN_ITEM_SIZE 128 + struct lbs_private *priv = dev->priv; + int err = 0; + char *ev = extra; + char *stop = ev + dwrq->length; + struct bss_descriptor * iter_bss; + struct bss_descriptor * safe; + + lbs_deb_enter(LBS_DEB_SCAN); + + /* iwlist should wait until the current scan is finished */ + if (priv->last_scanned_channel) + return -EAGAIN; + + /* Update RSSI if current BSS is a locally created ad-hoc BSS */ + if ((priv->mode == IW_MODE_ADHOC) && priv->adhoccreate) { + lbs_prepare_and_send_command(priv, CMD_802_11_RSSI, 0, + CMD_OPTION_WAITFORRSP, 0, NULL); + } + + mutex_lock(&priv->lock); + list_for_each_entry_safe (iter_bss, safe, &priv->network_list, list) { + char * next_ev; + unsigned long stale_time; + + if (stop - ev < SCAN_ITEM_SIZE) { + err = -E2BIG; + break; + } + + /* For mesh device, list only mesh networks */ + if (dev == priv->mesh_dev && !iter_bss->mesh) + continue; + + /* Prune old an old scan result */ + stale_time = iter_bss->last_scanned + DEFAULT_MAX_SCAN_AGE; + if (time_after(jiffies, stale_time)) { + list_move_tail (&iter_bss->list, + &priv->network_free_list); + clear_bss_descriptor(iter_bss); + continue; + } + + /* Translate to WE format this entry */ + next_ev = lbs_translate_scan(priv, ev, stop, iter_bss); + if (next_ev == NULL) + continue; + ev = next_ev; + } + mutex_unlock(&priv->lock); + + dwrq->length = (ev - extra); + dwrq->flags = 0; + + lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", err); + return err; +} + + + + +/*********************************************************************/ +/* */ +/* Command execution */ +/* */ +/*********************************************************************/ + + +/** + * @brief Prepare a scan command to be sent to the firmware + * + * Called via lbs_prepare_and_send_command(priv, CMD_802_11_SCAN, ...) + * from cmd.c + * + * Sends a fixed lenght data part (specifying the BSS type and BSSID filters) + * as well as a variable number/length of TLVs to the firmware. + * + * @param priv A pointer to struct lbs_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 lbs_scan_cmd_config struct used + * to set the fields/TLVs for the command sent to firmware + * + * @return 0 or -1 + */ +int lbs_cmd_80211_scan(struct lbs_private *priv, + struct cmd_ds_command *cmd, void *pdata_buf) +{ + struct cmd_ds_802_11_scan *pscan = &cmd->params.scan; + struct lbs_scan_cmd_config *pscancfg = pdata_buf; + + lbs_deb_enter(LBS_DEB_SCAN); + + /* Set fixed field variables in scan command */ + pscan->bsstype = pscancfg->bsstype; + memcpy(pscan->bssid, pscancfg->bssid, ETH_ALEN); + memcpy(pscan->tlvbuffer, pscancfg->tlvbuffer, pscancfg->tlvbufferlen); + + /* size is equal to the sizeof(fixed portions) + the TLV len + header */ + cmd->size = cpu_to_le16(sizeof(pscan->bsstype) + ETH_ALEN + + pscancfg->tlvbufferlen + S_DS_GEN); + + lbs_deb_leave(LBS_DEB_SCAN); + return 0; +} + +/** + * @brief This function handles the command response of scan + * + * Called from handle_cmd_response() in cmdrespc. + * + * 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 struct lbs_private structure + * @param resp A pointer to cmd_ds_command + * + * @return 0 or -1 + */ +int lbs_ret_80211_scan(struct lbs_private *priv, struct cmd_ds_command *resp) +{ + struct cmd_ds_802_11_scan_rsp *pscan; + struct bss_descriptor * iter_bss; + struct bss_descriptor * safe; + u8 *pbssinfo; + u16 scanrespsize; + int bytesleft; + int idx; + int tlvbufsize; + int ret; + + lbs_deb_enter(LBS_DEB_SCAN); + + /* Prune old entries from scan table */ + list_for_each_entry_safe (iter_bss, safe, &priv->network_list, list) { + unsigned long stale_time = iter_bss->last_scanned + DEFAULT_MAX_SCAN_AGE; + if (time_before(jiffies, stale_time)) + continue; + list_move_tail (&iter_bss->list, &priv->network_free_list); + clear_bss_descriptor(iter_bss); + } + + pscan = &resp->params.scanresp; + + if (pscan->nr_sets > MAX_NETWORK_COUNT) { + lbs_deb_scan( + "SCAN_RESP: too many scan results (%d, max %d)!!\n", + pscan->nr_sets, MAX_NETWORK_COUNT); + ret = -1; + goto done; + } + + bytesleft = le16_to_cpu(pscan->bssdescriptsize); + lbs_deb_scan("SCAN_RESP: bssdescriptsize %d\n", bytesleft); + + scanrespsize = le16_to_cpu(resp->size); + lbs_deb_scan("SCAN_RESP: scan results %d\n", pscan->nr_sets); + + 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); + + /* + * 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++) { + struct bss_descriptor new; + struct bss_descriptor * found = NULL; + struct bss_descriptor * oldest = NULL; + DECLARE_MAC_BUF(mac); + + /* Process the data fields and IEs returned for this BSS */ + memset(&new, 0, sizeof (struct bss_descriptor)); + if (lbs_process_bss(&new, &pbssinfo, &bytesleft) != 0) { + /* error parsing the scan response, skipped */ + lbs_deb_scan("SCAN_RESP: process_bss returned ERROR\n"); + continue; + } + + /* Try to find this bss in the scan table */ + list_for_each_entry (iter_bss, &priv->network_list, list) { + if (is_same_network(iter_bss, &new)) { + found = iter_bss; + break; + } + + if ((oldest == NULL) || + (iter_bss->last_scanned < oldest->last_scanned)) + oldest = iter_bss; + } + + if (found) { + /* found, clear it */ + clear_bss_descriptor(found); + } else if (!list_empty(&priv->network_free_list)) { + /* Pull one from the free list */ + found = list_entry(priv->network_free_list.next, + struct bss_descriptor, list); + list_move_tail(&found->list, &priv->network_list); + } else if (oldest) { + /* If there are no more slots, expire the oldest */ + found = oldest; + clear_bss_descriptor(found); + list_move_tail(&found->list, &priv->network_list); + } else { + continue; + } + + lbs_deb_scan("SCAN_RESP: BSSID %s\n", + print_mac(mac, new.bssid)); + + /* Copy the locally created newbssentry to the scan table */ + memcpy(found, &new, offsetof(struct bss_descriptor, list)); + } + + ret = 0; + +done: + lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret); + return ret; +} |