diff options
Diffstat (limited to 'target/linux/package/ieee80211-dscape/src/ieee80211.c')
| -rw-r--r-- | target/linux/package/ieee80211-dscape/src/ieee80211.c | 4895 |
1 files changed, 4895 insertions, 0 deletions
diff --git a/target/linux/package/ieee80211-dscape/src/ieee80211.c b/target/linux/package/ieee80211-dscape/src/ieee80211.c new file mode 100644 index 0000000000..5e4e7acfba --- /dev/null +++ b/target/linux/package/ieee80211-dscape/src/ieee80211.c @@ -0,0 +1,4895 @@ +/* + * Copyright 2002-2005, Instant802 Networks, Inc. + * Copyright 2005, Devicescape Software, Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#ifndef EXPORT_SYMTAB +#define EXPORT_SYMTAB +#endif + +#include <linux/config.h> +#include <linux/version.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/netdevice.h> +#include <linux/types.h> +#include <linux/slab.h> +#include <linux/skbuff.h> +#include <linux/etherdevice.h> +#include <linux/if_arp.h> +#include <linux/wireless.h> +#include <net/iw_handler.h> +#include <linux/compiler.h> + +#include <net/ieee80211.h> +#include <net/ieee80211_common.h> +#include <net/ieee80211_mgmt.h> +#include "ieee80211_i.h" +#include "ieee80211_proc.h" +#include "rate_control.h" +#include "wep.h" +#include "wpa.h" +#include "tkip.h" +#include "wme.h" + + +/* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */ +/* Ethernet-II snap header (RFC1042 for most EtherTypes) */ +static unsigned char rfc1042_header[] = +{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 }; +/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */ +static unsigned char bridge_tunnel_header[] = +{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 }; +/* No encapsulation header if EtherType < 0x600 (=length) */ + +static unsigned char eapol_header[] = +{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00, 0x88, 0x8e }; + + +struct rate_control_algs { + struct rate_control_algs *next; + struct rate_control_ops *ops; +}; + +static struct rate_control_algs *ieee80211_rate_ctrl_algs; + +static int rate_control_initialize(struct ieee80211_local *local); + + +static u8 * ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len); + + +struct ieee80211_key_conf * +ieee80211_key_data2conf(struct ieee80211_local *local, + struct ieee80211_key *data) +{ + struct ieee80211_key_conf *conf; + + conf = kmalloc(sizeof(*conf) + data->keylen, GFP_ATOMIC); + if (conf == NULL) + return NULL; + + conf->hw_key_idx = data->hw_key_idx; + conf->alg = data->alg; + conf->keylen = data->keylen; + conf->force_sw_encrypt = data->force_sw_encrypt; + conf->keyidx = data->keyidx; + conf->default_tx_key = data->default_tx_key; + conf->default_wep_only = local->default_wep_only; + memcpy(conf->key, data->key, data->keylen); + + return conf; +} + + +static int rate_list_match(int *rate_list, int rate) +{ + int i; + + if (rate_list == NULL) + return 0; + + for (i = 0; rate_list[i] >= 0; i++) + if (rate_list[i] == rate) + return 1; + + return 0; +} + + +void ieee80211_prepare_rates(struct net_device *dev) +{ + struct ieee80211_local *local = dev->priv; + int i; + + for (i = 0; i < local->num_curr_rates; i++) { + struct ieee80211_rate *rate = &local->curr_rates[i]; + + rate->flags &= ~(IEEE80211_RATE_SUPPORTED | + IEEE80211_RATE_BASIC); + + if (local->supp_rates[local->conf.phymode]) { + if (!rate_list_match(local->supp_rates + [local->conf.phymode], + rate->rate)) + continue; + } + + rate->flags |= IEEE80211_RATE_SUPPORTED; + + /* Use configured basic rate set if it is available. If not, + * use defaults that are sane for most cases. */ + if (local->basic_rates[local->conf.phymode]) { + if (rate_list_match(local->basic_rates + [local->conf.phymode], + rate->rate)) + rate->flags |= IEEE80211_RATE_BASIC; + } else switch (local->conf.phymode) { + case MODE_IEEE80211A: + if (rate->rate == 60 || rate->rate == 120 || + rate->rate == 240) + rate->flags |= IEEE80211_RATE_BASIC; + break; + case MODE_IEEE80211B: + if (rate->rate == 10 || rate->rate == 20) + rate->flags |= IEEE80211_RATE_BASIC; + break; + case MODE_ATHEROS_TURBO: + if (rate->rate == 120 || rate->rate == 240 || + rate->rate == 480) + rate->flags |= IEEE80211_RATE_BASIC; + break; + case MODE_IEEE80211G: + if (rate->rate == 10 || rate->rate == 20 || + rate->rate == 55 || rate->rate == 110) + rate->flags |= IEEE80211_RATE_BASIC; + break; + } + + /* Set ERP and MANDATORY flags based on phymode */ + switch (local->conf.phymode) { + case MODE_IEEE80211A: + if (rate->rate == 60 || rate->rate == 120 || + rate->rate == 240) + rate->flags |= IEEE80211_RATE_MANDATORY; + break; + case MODE_IEEE80211B: + if (rate->rate == 10) + rate->flags |= IEEE80211_RATE_MANDATORY; + break; + case MODE_ATHEROS_TURBO: + break; + case MODE_IEEE80211G: + if (rate->rate == 10 || rate->rate == 20 || + rate->rate == 55 || rate->rate == 110 || + rate->rate == 60 || rate->rate == 120 || + rate->rate == 240) + rate->flags |= IEEE80211_RATE_MANDATORY; + if (rate->rate != 10 && rate->rate != 20 && + rate->rate != 55 && rate->rate != 110) + rate->flags |= IEEE80211_RATE_ERP; + break; + } + } +} + + +static void ieee80211_key_threshold_notify(struct net_device *dev, + struct ieee80211_key *key, + struct sta_info *sta) +{ + struct sk_buff *skb; + struct ieee80211_msg_key_notification *msg; + + skb = dev_alloc_skb(sizeof(struct ieee80211_frame_info) + + sizeof(struct ieee80211_msg_key_notification)); + if (skb == NULL) + return; + + skb_reserve(skb, sizeof(struct ieee80211_frame_info)); + msg = (struct ieee80211_msg_key_notification *) + skb_put(skb, sizeof(struct ieee80211_msg_key_notification)); + msg->tx_rx_count = key->tx_rx_count; + memcpy(msg->ifname, dev->name, IFNAMSIZ); + if (sta) + memcpy(msg->addr, sta->addr, ETH_ALEN); + else + memset(msg->addr, 0xff, ETH_ALEN); + + key->tx_rx_count = 0; + + ieee80211_rx_mgmt(dev, skb, 0, + ieee80211_msg_key_threshold_notification); +} + + +int ieee80211_get_hdrlen(u16 fc) +{ + int hdrlen = 24; + + switch (WLAN_FC_GET_TYPE(fc)) { + case WLAN_FC_TYPE_DATA: + if ((fc & WLAN_FC_FROMDS) && (fc & WLAN_FC_TODS)) + hdrlen = 30; /* Addr4 */ + if (WLAN_FC_GET_STYPE(fc) & 0x08) + hdrlen += 2; /* QoS Control Field */ + break; + case WLAN_FC_TYPE_CTRL: + switch (WLAN_FC_GET_STYPE(fc)) { + case WLAN_FC_STYPE_CTS: + case WLAN_FC_STYPE_ACK: + hdrlen = 10; + break; + default: + hdrlen = 16; + break; + } + break; + } + + return hdrlen; +} + + +int ieee80211_get_hdrlen_from_skb(struct sk_buff *skb) +{ + struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; + int hdrlen; + + if (unlikely(skb->len < 10)) + return 0; + hdrlen = ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control)); + if (unlikely(hdrlen > skb->len)) + return 0; + return hdrlen; +} + + +#ifdef IEEE80211_VERBOSE_DEBUG_FRAME_DUMP +static void ieee80211_dump_frame(const char *ifname, const char *title, + struct sk_buff *skb) +{ + struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; + u16 fc; + int hdrlen; + + printk(KERN_DEBUG "%s: %s (len=%d)", ifname, title, skb->len); + if (skb->len < 4) { + printk("\n"); + return; + } + + fc = le16_to_cpu(hdr->frame_control); + hdrlen = ieee80211_get_hdrlen(fc); + if (hdrlen > skb->len) + hdrlen = skb->len; + if (hdrlen >= 4) + printk(" FC=0x%04x DUR=0x%04x", + fc, le16_to_cpu(hdr->duration_id)); + if (hdrlen >= 10) + printk(" A1=" MACSTR, MAC2STR(hdr->addr1)); + if (hdrlen >= 16) + printk(" A2=" MACSTR, MAC2STR(hdr->addr2)); + if (hdrlen >= 24) + printk(" A3=" MACSTR, MAC2STR(hdr->addr3)); + if (hdrlen >= 30) + printk(" A4=" MACSTR, MAC2STR(hdr->addr4)); + printk("\n"); +} +#else /* IEEE80211_VERBOSE_DEBUG_FRAME_DUMP */ +static inline void ieee80211_dump_frame(const char *ifname, const char *title, + struct sk_buff *skb) +{ +} +#endif /* IEEE80211_VERBOSE_DEBUG_FRAME_DUMP */ + + +static int ieee80211_is_eapol(struct sk_buff *skb) +{ + struct ieee80211_hdr *hdr; + u16 fc; + int hdrlen; + + if (unlikely(skb->len < 10)) + return 0; + + hdr = (struct ieee80211_hdr *) skb->data; + fc = le16_to_cpu(hdr->frame_control); + + if (unlikely(!WLAN_FC_DATA_PRESENT(fc))) + return 0; + + hdrlen = ieee80211_get_hdrlen(fc); + + if (unlikely(skb->len >= hdrlen + sizeof(eapol_header) && + memcmp(skb->data + hdrlen, eapol_header, + sizeof(eapol_header)) == 0)) + return 1; + + return 0; +} + + +static ieee80211_txrx_result +ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data *tx) +{ + struct rate_control_extra extra; + + memset(&extra, 0, sizeof(extra)); + extra.mgmt_data = tx->sdata && + tx->sdata->type == IEEE80211_SUB_IF_TYPE_MGMT; + extra.ethertype = tx->ethertype; + extra.startidx = 0; + extra.endidx = tx->local->num_curr_rates; + + + tx->u.tx.rate = rate_control_get_rate(tx->dev, tx->skb, &extra); + if (unlikely(extra.probe != NULL)) { + tx->u.tx.control->rate_ctrl_probe = 1; + tx->u.tx.probe_last_frag = 1; +// tx->u.tx.control->alt_retry_rate = tx->u.tx.rate->val; + tx->u.tx.rate = extra.probe; + } else { +// tx->u.tx.control->alt_retry_rate = -1; + } + if (!tx->u.tx.rate) + return TXRX_DROP; + if (tx->local->conf.phymode == MODE_IEEE80211G && + tx->local->cts_protect_erp_frames && tx->fragmented && + extra.nonerp) { + tx->u.tx.last_frag_rate = tx->u.tx.rate; + tx->u.tx.last_frag_rateidx = extra.rateidx; + tx->u.tx.probe_last_frag = extra.probe ? 1 : 0; + + tx->u.tx.rate = extra.nonerp; +// tx->u.tx.control->rateidx = extra.nonerp_idx; + tx->u.tx.control->rate_ctrl_probe = 0; + } else { + tx->u.tx.last_frag_rate = tx->u.tx.rate; + tx->u.tx.last_frag_rateidx = extra.rateidx; +// tx->u.tx.control->rateidx = extra.rateidx; + } + tx->u.tx.control->tx_rate = tx->u.tx.rate->val; + if ((tx->u.tx.rate->flags & IEEE80211_RATE_PREAMBLE2) && + tx->local->short_preamble && + (!tx->sta || (tx->sta->flags & WLAN_STA_SHORT_PREAMBLE))) { + tx->u.tx.short_preamble = 1; + tx->u.tx.control->tx_rate = tx->u.tx.rate->val2; + } + + return TXRX_CONTINUE; +} + + +static ieee80211_txrx_result +ieee80211_tx_h_select_key(struct ieee80211_txrx_data *tx) +{ + if (tx->sta) + tx->u.tx.control->key_idx = tx->sta->key_idx_compression; + else + tx->u.tx.control->key_idx = HW_KEY_IDX_INVALID; + + if (unlikely(tx->u.tx.control->do_not_encrypt)) + tx->key = NULL; + else if (tx->sta && tx->sta->key) + tx->key = tx->sta->key; + else if (tx->sdata->default_key) + tx->key = tx->sdata->default_key; + else if (tx->sdata->drop_unencrypted && !(tx->sdata->eapol && ieee80211_is_eapol(tx->skb))) { + I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted); + return TXRX_DROP; + } else + tx->key = NULL; + + if (tx->key) { + tx->key->tx_rx_count++; + if (unlikely(tx->local->key_tx_rx_threshold && + tx->key->tx_rx_count > + tx->local->key_tx_rx_threshold)) { + ieee80211_key_threshold_notify(tx->dev, tx->key, + tx->sta); + } + } + + return TXRX_CONTINUE; +} + + +static ieee80211_txrx_result +ieee80211_tx_h_fragment(struct ieee80211_txrx_data *tx) +{ + struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data; + size_t hdrlen, per_fragm, num_fragm, payload_len, left; + struct sk_buff **frags, *first, *frag; + int i; + u8 *pos; + int frag_threshold = tx->local->fragmentation_threshold; + + if (!tx->fragmented) + return TXRX_CONTINUE; + + + first = tx->skb; + + hdrlen = ieee80211_get_hdrlen(tx->fc); + payload_len = first->len - hdrlen; + per_fragm = frag_threshold - hdrlen - 4 /* FCS */; + num_fragm = (payload_len + per_fragm - 1) / per_fragm; + + frags = (struct sk_buff **) + kmalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC); + if (frags == NULL) + goto fail; + memset(frags, 0, num_fragm * sizeof(struct sk_buff *)); + + hdr->frame_control |= cpu_to_le16(WLAN_FC_MOREFRAG); + pos = first->data + hdrlen + per_fragm; + left = payload_len - per_fragm; + for (i = 0; i < num_fragm - 1; i++) { + struct ieee80211_hdr *fhdr; + size_t copylen; + + if (left <= 0) + goto fail; + + /* reserve enough extra head and tail room for possible + * encryption */ +#define IEEE80211_ENCRYPT_HEADROOM 8 +#define IEEE80211_ENCRYPT_TAILROOM 12 + frag = frags[i] = + dev_alloc_skb(frag_threshold + + IEEE80211_ENCRYPT_HEADROOM + + IEEE80211_ENCRYPT_TAILROOM); + if (!frag) + goto fail; + /* Make sure that all fragments use the same priority so + * that they end up using the same TX queue */ + frag->priority = first->priority; + skb_reserve(frag, IEEE80211_ENCRYPT_HEADROOM); + fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen); + memcpy(fhdr, first->data, hdrlen); + if (i == num_fragm - 2) + fhdr->frame_control &= cpu_to_le16(~WLAN_FC_MOREFRAG); + fhdr->seq_ctrl = cpu_to_le16(i + 1); + copylen = left > per_fragm ? per_fragm : left; + memcpy(skb_put(frag, copylen), pos, copylen); + + pos += copylen; + left -= copylen; + } + skb_trim(first, hdrlen + per_fragm); + + tx->u.tx.num_extra_frag = num_fragm - 1; + tx->u.tx.extra_frag = frags; + + return TXRX_CONTINUE; + + fail: + printk(KERN_DEBUG "%s: failed to fragment frame\n", tx->dev->name); + if (frags) { + for (i = 0; i < num_fragm - 1; i++) + if (frags[i]) + dev_kfree_skb(frags[i]); + kfree(frags); + } + I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment); + return TXRX_DROP; +} + + +static int wep_encrypt_skb(struct ieee80211_txrx_data *tx, struct sk_buff *skb) +{ + if (tx->key->force_sw_encrypt || tx->local->conf.sw_encrypt) { + if (ieee80211_wep_encrypt(tx->local, skb, tx->key)) + return -1; + } else { + tx->u.tx.control->key_idx = tx->key->hw_key_idx; + if (tx->local->hw->wep_include_iv) { + if (ieee80211_wep_add_iv(tx->local, skb, tx->key) == + NULL) + return -1; + } + } + return 0; +} + + +void ieee80211_tx_set_iswep(struct ieee80211_txrx_data *tx) +{ + struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data; + + hdr->frame_control |= cpu_to_le16(WLAN_FC_ISWEP); + if (tx->u.tx.extra_frag) { + struct ieee80211_hdr *fhdr; + int i; + for (i = 0; i < tx->u.tx.num_extra_frag; i++) { + fhdr = (struct ieee80211_hdr *) + tx->u.tx.extra_frag[i]->data; + fhdr->frame_control |= cpu_to_le16(WLAN_FC_ISWEP); + } + } +} + + +static ieee80211_txrx_result +ieee80211_tx_h_wep_encrypt(struct ieee80211_txrx_data *tx) +{ + struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data; + u16 fc; + + fc = le16_to_cpu(hdr->frame_control); + + if (!tx->key || tx->key->alg != ALG_WEP || + (WLAN_FC_GET_TYPE(fc) != WLAN_FC_TYPE_DATA && + (WLAN_FC_GET_TYPE(fc) != WLAN_FC_TYPE_MGMT || + WLAN_FC_GET_STYPE(fc) != WLAN_FC_STYPE_AUTH))) + return TXRX_CONTINUE; + + tx->u.tx.control->iv_len = WEP_IV_LEN; + tx->u.tx.control->icv_len = WEP_ICV_LEN; + ieee80211_tx_set_iswep(tx); + + if (wep_encrypt_skb(tx, tx->skb) < 0) { + I802_DEBUG_INC(tx->local->tx_handlers_drop_wep); + return TXRX_DROP; + } + + if (tx->u.tx.extra_frag) { + int i; + for (i = 0; i < tx->u.tx.num_extra_frag; i++) { + if (wep_encrypt_skb(tx, tx->u.tx.extra_frag[i]) < 0) { + I802_DEBUG_INC(tx->local-> + tx_handlers_drop_wep); + return TXRX_DROP; + } + } + } + + return TXRX_CONTINUE; +} + + +static inline int ceiling_div(int dividend, int divisor) +{ + return ((dividend + divisor - 1) / divisor); +} + + +static int ieee80211_frame_duration(struct ieee80211_local *local, size_t len, + int rate, int erp, int short_preamble) +{ + int dur; + + /* calculate duration (in microseconds, rounded up to next higher + * integer if it includes a fractional microsecond) to send frame of + * len bytes (does not include FCS) at the given rate. Duration will + * also include SIFS. + * + * rate is in 100 kbps, so divident is multiplied by 10 in the + * ceiling_div() operations. + */ + + if (local->conf.phymode == MODE_IEEE80211A || erp || + local->conf.phymode == MODE_ATHEROS_TURBO) { + /* + * OFDM: + * + * N_DBPS = DATARATE x 4 + * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS) + * (16 = SIGNAL time, 6 = tail bits) + * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext + * + * T_SYM = 4 usec + * 802.11a - 17.5.2: aSIFSTime = 16 usec + * 802.11g - 19.8.4: aSIFSTime = 10 usec + + * signal ext = 6 usec + */ + /* FIX: Atheros Turbo may have different (shorter) duration? */ + dur = 16; /* SIFS + signal ext */ + dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */ + dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */ + dur += 4 * ceiling_div((16 + 8 * (len + 4) + 6) * 10, + 4 * rate); /* T_SYM x N_SYM */ + } else { + /* + * 802.11b or 802.11g with 802.11b compatibility: + * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime + + * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0. + * + * 802.11 (DS): 15.3.3, 802.11b: 18.3.4 + * aSIFSTime = 10 usec + * aPreambleLength = 144 usec or 72 usec with short preamble + * aPLCPHeaderLength = 48 ms or 24 ms with short preamble + */ + dur = 10; /* aSIFSTime = 10 usec */ + dur += short_preamble ? (72 + 24) : (144 + 48); + + dur += ceiling_div(8 * (len + 4) * 10, rate); + } + + return dur; +} + + +static u16 ieee80211_duration(struct ieee80211_txrx_data *tx, int group_addr, + int next_frag_len) +{ + int rate, mrate, erp, dur, i; + struct ieee80211_rate *txrate = tx->u.tx.rate; + struct ieee80211_local *local = tx->local; + + erp = txrate->flags & IEEE80211_RATE_ERP; + + /* + * data and mgmt (except PS Poll): + * - during CFP: 32768 + * - during contention period: + * if addr1 is group address: 0 + * if more fragments = 0 and addr1 is individual address: time to + * transmit one ACK plus SIFS + * if more fragments = 1 and addr1 is individual address: time to + * transmit next fragment plus 2 x ACK plus 3 x SIFS + * + * IEEE 802.11, 9.6: + * - control response frame (CTS or ACK) shall be transmitted using the + * same rate as the immediately previous frame in the frame exchange + * sequence, if this rate belongs to the PHY mandatory rates, or else + * at the highest possible rate belonging to the PHY rates in the + * BSSBasicRateSet + */ + + if (WLAN_FC_GET_TYPE(tx->fc) == WLAN_FC_TYPE_CTRL) { + /* TODO: These control frames are not currently sent by + * 80211.o, but should they be implemented, this function + * needs to be updated to support duration field calculation. + * + * RTS: time needed to transmit pending data/mgmt frame plus + * one CTS frame plus one ACK frame plus 3 x SIFS + * CTS: duration of immediately previous RTS minus time + * required to transmit CTS and its SIFS + * ACK: 0 if immediately previous directed data/mgmt had + * more=0, with more=1 duration in ACK frame is duration + * from previous frame minus time needed to transmit ACK + * and its SIFS + * PS Poll: BIT(15) | BIT(14) | aid + */ + return 0; + } + + /* data/mgmt */ + if (0 /* FIX: data/mgmt during CFP */) + return 32768; + + if (group_addr) /* Group address as the destination - no ACK */ + return 0; + + /* Individual destination address: + * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) + * CTS and ACK frames shall be transmitted using the highest rate in + * basic rate set that is less than or equal to the rate of the + * immediately previous frame and that is using the same modulation + * (CCK or OFDM). If no basic rate set matches with these requirements, + * the highest mandatory rate of the PHY that is less than or equal to + * the rate of the previous frame is used. + * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps + */ + rate = -1; + mrate = 10; /* use 1 Mbps if everything fails */ + for (i = 0; i < local->num_curr_rates; i++) { + struct ieee80211_rate *r = &local->curr_rates[i]; + if (r->rate > txrate->rate) + break; + + if (IEEE80211_RATE_MODULATION(txrate->flags) != + IEEE80211_RATE_MODULATION(r->flags)) + continue; + + if (r->flags & IEEE80211_RATE_BASIC) + rate = r->rate; + else if (r->flags & IEEE80211_RATE_MANDATORY) + mrate = r->rate; + } + if (rate == -1) { + /* No matching basic rate found; use highest suitable mandatory + * PHY rate */ + rate = mrate; + } + + /* Time needed to transmit ACK + * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up + * to closest integer */ + + dur = ieee80211_frame_duration(local, 10, rate, erp, + local->short_preamble); + + if (next_frag_len) { + /* Frame is fragmented: duration increases with time needed to + * transmit next fragment plus ACK and 2 x SIFS. */ + dur *= 2; /* ACK + SIFS */ + /* next fragment */ + dur += ieee80211_frame_duration(local, next_frag_len, + txrate->rate, erp, + local->short_preamble); + } + + return dur; +} + + +static ieee80211_txrx_result +ieee80211_tx_h_misc(struct ieee80211_txrx_data *tx) +{ + struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data; + u16 dur; + struct ieee80211_tx_control *control = tx->u.tx.control; + + if (!MULTICAST_ADDR(hdr->addr1)) { + if (tx->skb->len >= tx->local->rts_threshold && + tx->local->rts_threshold < IEEE80211_MAX_RTS_THRESHOLD) { + control->use_rts_cts = 1; + control->retry_limit = + tx->local->long_retry_limit; + } else { + control->retry_limit = + tx->local->short_retry_limit; + } + } else { + control->retry_limit = 1; + } + + if (tx->fragmented) { + /* Do not use multiple retry rates when sending fragmented + * frames. + * TODO: The last fragment could still use multiple retry + * rates. */ +// control->alt_retry_rate = -1; + } + + /* Use CTS protection for unicast frames sent using extended rates if + * there are associated non-ERP stations and RTS/CTS is not configured + * for the frame. */ + if (tx->local->conf.phymode == MODE_IEEE80211G && + (tx->u.tx.rate->flags & IEEE80211_RATE_ERP) && + tx->u.tx.unicast && + tx->local->cts_protect_erp_frames && + !control->use_rts_cts) + control->use_cts_protect = 1; + + + /* Setup duration field for the first fragment of the frame. Duration + * for remaining fragments will be updated when they are being sent + * to low-level driver in ieee80211_tx(). */ + dur = ieee80211_duration(tx, MULTICAST_ADDR(hdr->addr1), + tx->fragmented ? tx->u.tx.extra_frag[0]->len : + 0); + hdr->duration_id = cpu_to_le16(dur); + + if (control->use_rts_cts || control->use_cts_protect) { + struct ieee80211_rate *rate; + int erp = tx->u.tx.rate->flags & IEEE80211_RATE_ERP; + + /* Do not use multiple retry rates when using RTS/CTS */ +// control->alt_retry_rate = -1; + + /* Use min(data rate, max base rate) as CTS/RTS rate */ + rate = tx->u.tx.rate; + while (rate > tx->local->curr_rates && + !(rate->flags & IEEE80211_RATE_BASIC)) + rate--; + + + if (control->use_rts_cts) + dur += ieee80211_frame_duration(tx->local, 10, + rate->rate, erp, + tx->local-> + short_preamble); + dur += ieee80211_frame_duration(tx->local, tx->skb->len, + tx->u.tx.rate->rate, erp, + tx->u.tx.short_preamble); + control->rts_cts_duration = dur; + control->rts_cts_rate = rate->val; + } + + if (tx->sta) { + tx->sta->tx_packets++; + tx->sta->tx_fragments++; + tx->sta->tx_bytes += tx->skb->len; + if (tx->u.tx.extra_frag) { + int i; + tx->sta->tx_fragments += tx->u.tx.num_extra_frag; + for (i = 0; i < tx->u.tx.num_extra_frag; i++) { + tx->sta->tx_bytes += + tx->u.tx.extra_frag[i]->len; + } + } + } + tx->local->scan.txrx_count++; + + return TXRX_CONTINUE; +} + + +static void ieee80211_rate_limit(unsigned long data) +{ + struct ieee80211_local *local = (struct ieee80211_local *) data; + + if (local->rate_limit) { + local->rate_limit_bucket += local->rate_limit; + if (local->rate_limit_bucket > local->rate_limit_burst) + local->rate_limit_bucket = local->rate_limit_burst; + local->rate_limit_timer.expires = jiffies + HZ; + add_timer(&local->rate_limit_timer); + } + +} + +static ieee80211_txrx_result +ieee80211_tx_h_rate_limit(struct ieee80211_txrx_data *tx) +{ + + if (likely(!tx->local->rate_limit || tx->u.tx.unicast)) + return TXRX_CONTINUE; + + /* rate limit */ + if (tx->local->rate_limit_bucket) { + tx->local->rate_limit_bucket--; + return TXRX_CONTINUE; + } + + I802_DEBUG_INC(tx->local->tx_handlers_drop_rate_limit); + return TXRX_DROP; +} + + + +static ieee80211_txrx_result +ieee80211_tx_h_check_assoc(struct ieee80211_txrx_data *tx) +{ +#ifdef CONFIG_IEEE80211_VERBOSE_DEBUG + struct sk_buff *skb = tx->skb; + struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; +#endif /* CONFIG_IEEE80211_VERBOSE_DEBUG */ + u32 sta_flags; + + if (unlikely(tx->local->sta_scanning != 0) && + (WLAN_FC_GET_TYPE(tx->fc) != WLAN_FC_TYPE_MGMT || + WLAN_FC_GET_STYPE(tx->fc) != WLAN_FC_STYPE_PROBE_REQ)) + return TXRX_DROP; + + if (tx->u.tx.ps_buffered) + return TXRX_CONTINUE; + + sta_flags = tx->sta ? tx->sta->flags : 0; + + if (likely(tx->u.tx.unicast)) { + if (unlikely(!(sta_flags & WLAN_STA_ASSOC) && + tx->local->conf.mode != IW_MODE_ADHOC && + WLAN_FC_GET_TYPE(tx->fc) == WLAN_FC_TYPE_DATA)) { +#ifdef CONFIG_IEEE80211_VERBOSE_DEBUG + printk(KERN_DEBUG "%s: dropped data frame to not " + "associated station " MACSTR "\n", + tx->dev->name, MAC2STR(hdr->addr1)); +#endif /* CONFIG_IEEE80211_VERBOSE_DEBUG */ + I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); + return TXRX_DROP; + } + } else { + if (unlikely(WLAN_FC_GET_TYPE(tx->fc) == WLAN_FC_TYPE_DATA && + tx->local->num_sta == 0 && + !tx->local->allow_broadcast_always && + tx->local->conf.mode != IW_MODE_ADHOC)) { + /* + * No associated STAs - no need to send multicast + * frames. + */ + return TXRX_DROP; + } + return TXRX_CONTINUE; + } + + if (unlikely(!tx->u.tx.mgmt_interface && tx->sdata->ieee802_1x && + !(sta_flags & WLAN_STA_AUTHORIZED))) { +#ifdef CONFIG_IEEE80211_DEBUG + struct ieee80211_hdr *hdr = + (struct ieee80211_hdr *) tx->skb->data; + printk(KERN_DEBUG "%s: dropped frame to " MACSTR + " (unauthorized port)\n", tx->dev->name, + MAC2STR(hdr->addr1)); +#endif + I802_DEBUG_INC(tx->local->tx_handlers_drop_unauth_port); + return TXRX_DROP; + } + + return TXRX_CONTINUE; +} + + +/* This function is called whenever the AP is about to exceed the maximum limit + * of buffered frames for power saving STAs. This situation should not really + * happen often during normal operation, so dropping the oldest buffered packet + * from each queue should be OK to make some room for new frames. */ +static void purge_old_ps_buffers(struct ieee80211_local *local) +{ + int total = 0, purged = 0; + struct sk_buff *skb; + struct list_head *ptr; + + spin_lock_bh(&local->sub_if_lock); + list_for_each(ptr, &local->sub_if_list) { + struct ieee80211_if_norm *norm; + struct ieee80211_sub_if_data *sdata = + list_entry(ptr, struct ieee80211_sub_if_data, list); + if (sdata->dev == local->mdev || + sdata->type != IEEE80211_SUB_IF_TYPE_NORM) + continue; + norm = &sdata->u.norm; + skb = skb_dequeue(&norm->ps_bc_buf); + if (skb) { + purged++; + dev_kfree_skb(skb); + } + total += skb_queue_len(&norm->ps_bc_buf); + } + spin_unlock_bh(&local->sub_if_lock); + + spin_lock_bh(&local->sta_lock); + list_for_each(ptr, &local->sta_list) { + struct sta_info *sta = + list_entry(ptr, struct sta_info, list); + skb = skb_dequeue(&sta->ps_tx_buf); + if (skb) { + purged++; + dev_kfree_skb(skb); + } + total += skb_queue_len(&sta->ps_tx_buf); + } + spin_unlock_bh(&local->sta_lock); + + local->total_ps_buffered = total; + printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n", + local->mdev->name, purged); +} + + +static inline ieee80211_txrx_result +ieee80211_tx_h_multicast_ps_buf(struct ieee80211_txrx_data *tx) +{ + /* broadcast/multicast frame */ + /* If any of the associated stations is in power save mode, + * the frame is buffered to be sent after DTIM beacon frame */ + if (tx->local->hw->host_broadcast_ps_buffering && + tx->sdata->type != IEEE80211_SUB_IF_TYPE_WDS && + tx->sdata->bss && atomic_read(&tx->sdata->bss->num_sta_ps) && + !(tx->fc & WLAN_FC_ORDER)) { + if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) + purge_old_ps_buffers(tx->local); + if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >= + AP_MAX_BC_BUFFER) { + if (net_ratelimit()) { + printk(KERN_DEBUG "%s: BC TX buffer full - " + "dropping the oldest frame\n", + tx->dev->name); + } + dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf)); + } else + tx->local->total_ps_buffered++; + skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb); + return TXRX_QUEUED; + } + + return TXRX_CONTINUE; +} + + +static inline ieee80211_txrx_result +ieee80211_tx_h_unicast_ps_buf(struct ieee80211_txrx_data *tx) +{ + struct sta_info *sta = tx->sta; + + if (unlikely(!sta || + (WLAN_FC_GET_TYPE(tx->fc) == WLAN_FC_TYPE_MGMT && + WLAN_FC_GET_STYPE(tx->fc) == WLAN_FC_STYPE_PROBE_RESP))) + return TXRX_CONTINUE; + + if (unlikely((sta->flags & WLAN_STA_PS) && !sta->pspoll)) { + struct ieee80211_tx_packet_data *pkt_data; +#ifdef IEEE80211_VERBOSE_DEBUG_PS + printk(KERN_DEBUG "STA " MACSTR " aid %d: PS buffer (entries " + "before %d)\n", + MAC2STR(sta->addr), sta->aid, + skb_queue_len(&sta->ps_tx_buf)); +#endif /* IEEE80211_VERBOSE_DEBUG_PS */ + sta->flags |= WLAN_STA_TIM; + if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) + purge_old_ps_buffers(tx->local); + if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) { + struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf); + if (net_ratelimit()) { + printk(KERN_DEBUG "%s: STA " MACSTR " TX " + "buffer full - dropping oldest frame\n", + tx->dev->name, MAC2STR(sta->addr)); + } + dev_kfree_skb(old); + } else + tx->local->total_ps_buffered++; + /* Queue frame to be sent after STA sends an PS Poll frame */ + if (skb_queue_empty(&sta->ps_tx_buf) && tx->local->hw->set_tim) + tx->local->hw->set_tim(tx->dev, sta->aid, 1); + pkt_data = (struct ieee80211_tx_packet_data *)tx->skb->cb; + pkt_data->jiffies = jiffies; + skb_queue_tail(&sta->ps_tx_buf, tx->skb); + return TXRX_QUEUED; + } +#ifdef IEEE80211_VERBOSE_DEBUG_PS + else if (unlikely(sta->flags & WLAN_STA_PS)) { + printk(KERN_DEBUG "%s: STA " MACSTR " in PS mode, but pspoll " + "set -> send frame\n", tx->dev->name, + MAC2STR(sta->addr)); + } +#endif /* IEEE80211_VERBOSE_DEBUG_PS */ + sta->pspoll = 0; + + return TXRX_CONTINUE; +} + + +static ieee80211_txrx_result +ieee80211_tx_h_ps_buf(struct ieee80211_txrx_data *tx) +{ + if (unlikely(tx->u.tx.ps_buffered)) + return TXRX_CONTINUE; + + if (tx->u.tx.unicast) + return ieee80211_tx_h_unicast_ps_buf(tx); + else + return ieee80211_tx_h_multicast_ps_buf(tx); +} + + +static void inline ieee80211_tx_prepare(struct ieee80211_txrx_data *tx, + struct sk_buff *skb, + struct net_device *dev, + struct ieee80211_tx_control *control) +{ + struct ieee80211_local *local = dev->priv; + struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; + struct ieee80211_tx_packet_data *pkt_data; + int hdrlen; + + pkt_data = (struct ieee80211_tx_packet_data *)skb->cb; + + memset(tx, 0, sizeof(*tx)); + tx->skb = skb; + tx->dev = pkt_data->sdata->dev; /* use original interface */ + tx->local = local; + tx->sdata = pkt_data->sdata; + tx->sta = sta_info_get(local, hdr->addr1); + tx->fc = le16_to_cpu(hdr->frame_control); + control->power_level = local->conf.power_level; + tx->u.tx.control = control; + tx->u.tx.unicast = !MULTICAST_ADDR(hdr->addr1); + control->no_ack = MULTICAST_ADDR(hdr->addr1); + tx->fragmented = local->fragmentation_threshold < + IEEE80211_MAX_FRAG_THRESHOLD && tx->u.tx.unicast && + skb->len + 4 /* FCS */ > local->fragmentation_threshold && + (local->hw->set_frag_threshold == NULL); + if (tx->sta == NULL) + control->clear_dst_mask = 1; + else if (tx->sta->clear_dst_mask) { + control->clear_dst_mask = 1; + tx->sta->clear_dst_mask = 0; + } + control->antenna_sel = local->conf.antenna_sel; + if (local->sta_antenna_sel != STA_ANTENNA_SEL_AUTO && tx->sta) + control->antenna_sel = tx->sta->antenna_sel; + hdrlen = ieee80211_get_hdrlen(tx->fc); + if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) { + u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)]; + tx->ethertype = (pos[0] << 8) | pos[1]; + } + +} + + +static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb, + struct ieee80211_tx_control *control, int mgmt) +{ + struct ieee80211_local *local = dev->priv; + struct sta_info *sta; + ieee80211_tx_handler *handler; + struct ieee80211_txrx_data tx; + ieee80211_txrx_result res = TXRX_DROP; + int ret, i; + + if (unlikely(skb->len < 10)) { + dev_kfree_skb(skb); + return 0; + } + + ieee80211_tx_prepare(&tx, skb, dev, control); + sta = tx.sta; + tx.u.tx.mgmt_interface = mgmt; + + for (handler = local->tx_handlers; *handler != NULL; handler++) { + res = (*handler)(&tx); + if (res != TXRX_CONTINUE) + break; + } + + skb = tx.skb; /* handlers are allowed to change skb */ + + if (sta) + sta_info_release(local, sta); + + if (unlikely(res == TXRX_DROP)) { + I802_DEBUG_INC(local->tx_handlers_drop); + goto drop; + } + + if (unlikely(res == TXRX_QUEUED)) { + I802_DEBUG_INC(local->tx_handlers_queued); + return 0; + } + + ieee80211_dump_frame(dev->name, "TX to low-level driver", skb); + ret = local->hw->tx(dev, skb, control); +#ifdef IEEE80211_LEDS + if (!ret && local->tx_led_counter++ == 0) { + ieee80211_tx_led(1, dev); + } +#endif /* IEEE80211_LEDS */ + if (tx.u.tx.extra_frag) { + if (ret > 0) { + /* Must free all fragments and return 0 since skb data + * has been fragmented into multiple buffers. + * TODO: could free extra fragments and restore skb to + * the original form since the data is still there and + * then return nonzero so that Linux netif would + * retry. */ + goto drop; + } + + skb = NULL; /* skb is now owned by low-level driver */ + control->use_rts_cts = 0; + control->use_cts_protect = 0; + control->clear_dst_mask = 0; + for (i = 0; i < tx.u.tx.num_extra_frag; i++) { + int next_len, dur; + struct ieee80211_hdr *hdr = + (struct ieee80211_hdr *) + tx.u.tx.extra_frag[i]->data; + if (i + 1 < tx.u.tx.num_extra_frag) + next_len = tx.u.tx.extra_frag[i + 1]->len; + else { + next_len = 0; + tx.u.tx.rate = tx.u.tx.last_frag_rate; + tx.u.tx.control->tx_rate = tx.u.tx.rate->val; +// tx.u.tx.control->rateidx = +// tx.u.tx.last_frag_rateidx; + tx.u.tx.control->rate_ctrl_probe = + tx.u.tx.probe_last_frag; + } + dur = ieee80211_duration(&tx, 0, next_len); + hdr->duration_id = cpu_to_le16(dur); + + ieee80211_dump_frame(dev->name, + "TX to low-level driver", skb); + ret = local->hw->tx(dev, tx.u.tx.extra_frag[i], + control); + if (ret > 0) + goto drop; +#ifdef IEEE80211_LEDS + if (local->tx_led_counter++ == 0) { + ieee80211_tx_led(1, dev); + } +#endif /* IEEE80211_LEDS */ + tx.u.tx.extra_frag[i] = NULL; + } + kfree(tx.u.tx.extra_frag); + } + if (ret == -1) + ret = 0; + return ret; + + drop: + if (skb) + dev_kfree_skb(skb); + for (i = 0; i < tx.u.tx.num_extra_frag; i++) + if (tx.u.tx.extra_frag[i]) + dev_kfree_skb(tx.u.tx.extra_frag[i]); + kfree(tx.u.tx.extra_frag); + return 0; +} + + +static int ieee80211_master_start_xmit(struct sk_buff *skb, + struct net_device *dev) +{ + struct ieee80211_tx_control control; + struct ieee80211_tx_packet_data *pkt_data; + struct ieee80211_sub_if_data *sdata; + int ret = 1; + + sdata = IEEE80211_DEV_TO_SUB_IF(dev); + + /* + * copy control out of the skb so other people can use skb->cb + */ + pkt_data = (struct ieee80211_tx_packet_data *)skb->cb; + if (unlikely(pkt_data->magic != IEEE80211_CB_MAGIC)) { + printk(KERN_WARNING "%s: Someone messed with our skb->cb\n", + dev->name); + dev_kfree_skb(skb); + return 0; + } + memcpy(&control, &pkt_data->control, + sizeof(struct ieee80211_tx_control)); + + ret = ieee80211_tx(dev, skb, &control, + pkt_data->sdata->type == + IEEE80211_SUB_IF_TYPE_MGMT); + + return ret; +} + + +/** + * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type + * subinterfaces (wlan#, WDS, and VLAN interfaces) + * @skb: packet to be sent + * @dev: incoming interface + * + * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will + * not be freed, and caller is responsible for either retrying later or freeing + * skb). + * + * This function takes in an Ethernet header and encapsulates it with suitable + * IEEE 802.11 header based on which interface the packet is coming in. The + * encapsulated packet will then be passed to master interface, wlan#.11, for + * transmission (through low-level driver). + */ +static int ieee80211_subif_start_xmit(struct sk_buff *skb, + struct net_device *dev) +{ + struct ieee80211_local *local = (struct ieee80211_local *) dev->priv; + struct ieee80211_tx_packet_data *pkt_data; + struct ieee80211_sub_if_data *sdata; + int ret = 1, head_need; + u16 ethertype, hdrlen, fc; + struct ieee80211_hdr hdr; + u8 *encaps_data; + int encaps_len, skip_header_bytes; + int nh_pos, h_pos, no_encrypt = 0; + struct sta_info *sta; + + sdata = IEEE80211_DEV_TO_SUB_IF(dev); + if (unlikely(skb->len < ETH_HLEN)) { + printk(KERN_DEBUG "%s: short skb (len=%d)\n", + dev->name, skb->len); + ret = 0; + goto fail; + } + + nh_pos = skb->nh.raw - skb->data; + h_pos = skb->h.raw - skb->data; + + /* convert Ethernet header to proper 802.11 header (based on + * operation mode) */ + ethertype = (skb->data[12] << 8) | skb->data[13]; + /* TODO: handling for 802.1x authorized/unauthorized port */ + fc = (WLAN_FC_TYPE_DATA << 2) | (WLAN_FC_STYPE_DATA << 4); + + if (likely(sdata->type == IEEE80211_SUB_IF_TYPE_NORM || + sdata->type == IEEE80211_SUB_IF_TYPE_VLAN)) { + if (local->conf.mode == IW_MODE_MASTER) { + fc |= WLAN_FC_FROMDS; + /* DA BSSID SA */ + memcpy(hdr.addr1, skb->data, ETH_ALEN); + memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); + memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); + } else if (local->conf.mode == IW_MODE_INFRA) { + fc |= WLAN_FC_TODS; + /* BSSID SA DA */ + memcpy(hdr.addr1, local->bssid, ETH_ALEN); + memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); + memcpy(hdr.addr3, skb->data, ETH_ALEN); + } else if (local->conf.mode == IW_MODE_ADHOC) { + /* DA SA BSSID */ + memcpy(hdr.addr1, skb->data, ETH_ALEN); + memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); + memcpy(hdr.addr3, local->bssid, ETH_ALEN); + } + hdrlen = 24; + } else if (sdata->type == IEEE80211_SUB_IF_TYPE_WDS) { + fc |= WLAN_FC_FROMDS | WLAN_FC_TODS; + /* RA TA DA SA */ + memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); + memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); + memcpy(hdr.addr3, skb->data, ETH_ALEN); + memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); + hdrlen = 30; + } else if (sdata->type == IEEE80211_SUB_IF_TYPE_STA) { + if (local->conf.mode == IW_MODE_INFRA) { + fc |= WLAN_FC_TODS; + /* BSSID SA DA */ + memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN); + memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); + memcpy(hdr.addr3, skb->data, ETH_ALEN); + } else { + /* DA SA BSSID */ + memcpy(hdr.addr1, skb->data, ETH_ALEN); + memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); + memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN); + } + hdrlen = 24; + } else { + ret = 0; + goto fail; + } + + /* receiver is QoS enabled, use a QoS type frame */ + sta = sta_info_get(local, hdr.addr1); + if (sta) { + if (sta->flags & WLAN_STA_WME) { + fc |= WLAN_FC_STYPE_QOS_DATA << 4; + hdrlen += 2; + } + sta_info_release(local, sta); + } + + hdr.frame_control = cpu_to_le16(fc); + hdr.duration_id = 0; + hdr.seq_ctrl = 0; + + skip_header_bytes = ETH_HLEN; + if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { + encaps_data = bridge_tunnel_header; + encaps_len = sizeof(bridge_tunnel_header); + skip_header_bytes -= 2; + } else if (ethertype >= 0x600) { + encaps_data = rfc1042_header; + encaps_len = sizeof(rfc1042_header); + skip_header_bytes -= 2; + } else { + encaps_data = NULL; + encaps_len = 0; + } + + skb_pull(skb, skip_header_bytes); + nh_pos -= skip_header_bytes; + h_pos -= skip_header_bytes; + + /* TODO: implement support for fragments so that there is no need to + * reallocate and copy payload; it might be enough to support one + * extra fragment that would be copied in the beginning of the frame + * data.. anyway, it would be nice to include this into skb structure + * somehow + * + * There are few options for this: + * use skb->cb as an extra space for 802.11 header + * allocate new buffer if not enough headroom + * make sure that there is enough headroom in every skb by increasing + * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and + * alloc_skb() (net/core/skbuff.c) + */ + head_need = hdrlen + encaps_len + (local->hw->extra_hdr_room ? 2 : 0); + head_need -= skb_headroom(skb); + + /* We are going to modify skb data, so make a copy of it if happens to + * be cloned. This could happen, e.g., with Linux bridge code passing + * us broadcast frames. */ + + if (head_need > 0 || skb_cloned(skb)) { +#if 0 + printk(KERN_DEBUG "%s: need to reallocate buffer for %d bytes " + "of headroom\n", dev->name, head_need); +#endif + + if (skb_cloned(skb)) + I802_DEBUG_INC(local->tx_expand_skb_head_cloned); + else + I802_DEBUG_INC(local->tx_expand_skb_head); + /* Since we have to reallocate the buffer, make sure that there + * is enough room for possible WEP IV/ICV and TKIP (8 bytes + * before payload and 12 after). */ + if (pskb_expand_head(skb, (head_need > 0 ? head_need + 8 : 8), + 12, GFP_ATOMIC)) { + printk(KERN_DEBUG "%s: failed to reallocate TX buffer" + "\n", dev->name); + goto fail; + } + } + + if (encaps_data) { + memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); + nh_pos += encaps_len; + h_pos += encaps_len; + } + memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); + nh_pos += hdrlen; + h_pos += hdrlen; + + pkt_data = (struct ieee80211_tx_packet_data *)skb->cb; + memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data)); + pkt_data->magic = IEEE80211_CB_MAGIC; + pkt_data->sdata = sdata; + pkt_data->control.do_not_encrypt = no_encrypt; + + skb->dev = sdata->master; + sdata->stats.tx_packets++; + sdata->stats.tx_bytes += skb->len; + + /* Update skb pointers to various headers since this modified frame + * is going to go through Linux networking code that may potentially + * need things like pointer to IP header. */ + skb->mac.raw = skb->data; + skb->nh.raw = skb->data + nh_pos; + skb->h.raw = skb->data + h_pos; + + + dev_queue_xmit(skb); + + return 0; + + fail: + if (!ret) + dev_kfree_skb(skb); + + return ret; +} + + +/* + * This is the transmit routine for the 802.11 type interfaces + * called by upper layers of the linux networking + * stack when it has a frame to transmit + */ +static int +ieee80211_mgmt_start_xmit(struct sk_buff *skb, struct net_device *dev) +{ + struct ieee80211_sub_if_data *sdata; + struct ieee80211_tx_packet_data *pkt_data; + struct ieee80211_hdr *hdr; + u16 fc; + + sdata = IEEE80211_DEV_TO_SUB_IF(dev); + + if (skb->len < 10) { + dev_kfree_skb(skb); + return 0; + } + + hdr = (struct ieee80211_hdr *) skb->data; + fc = le16_to_cpu(hdr->frame_control); + + pkt_data = (struct ieee80211_tx_packet_data *)skb->cb; + memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data)); + pkt_data->magic = IEEE80211_CB_MAGIC; + pkt_data->sdata = sdata; + + if (WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_MGMT && + WLAN_FC_GET_STYPE(fc) == WLAN_FC_STYPE_PROBE_RESP) + pkt_data->control.pkt_type = PKT_PROBE_RESP; + + skb->priority = 20; /* use hardcode priority for mgmt TX queue */ + skb->dev = sdata->master; + + /* + * We're using the protocol field of the the frame control header + * to request TX callback for hostapd. BIT(1) is checked. + */ + if ((fc & BIT(1)) == BIT(1)) { + pkt_data->control.req_tx_status = 1; + fc &= ~BIT(1); + hdr->frame_control = cpu_to_le16(fc); + } + + + + pkt_data->control.do_not_encrypt = !(fc & WLAN_FC_ISWEP); + + sdata->stats.tx_packets++; + sdata->stats.tx_bytes += skb->len; + + dev_queue_xmit(skb); + + return 0; +} + + +static void ieee80211_beacon_add_tim(struct ieee80211_local *local, + struct ieee80211_if_norm *bss, + struct sk_buff *skb) +{ + u8 *pos, *tim; + int aid0 = 0; + int i, num_bits = 0, n1, n2; + u8 bitmap[251]; + + /* Generate bitmap for TIM only if there are any STAs in power save + * mode. */ + if (atomic_read(&bss->num_sta_ps) > 0 && bss->max_aid > 0) { + memset(bitmap, 0, sizeof(bitmap)); + spin_lock_bh(&local->sta_lock); + for (i = 0; i < bss->max_aid; i++) { + if (bss->sta_aid[i] && + (!skb_queue_empty(&bss->sta_aid[i]->ps_tx_buf) || + !skb_queue_empty(&bss->sta_aid[i]->tx_filtered))) + { + bitmap[(i + 1) / 8] |= 1 << (i + 1) % 8; + num_bits++; + } + } + spin_unlock_bh(&local->sta_lock); + } + + if (bss->dtim_count == 0) + bss->dtim_count = bss->dtim_period - 1; + else + bss->dtim_count--; + + tim = pos = (u8 *) skb_put(skb, 6); + *pos++ = WLAN_EID_TIM; + *pos++ = 4; + *pos++ = bss->dtim_count; + *pos++ = bss->dtim_period; + + if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf)) { + aid0 = 1; + } + + if (num_bits) { + /* Find largest even number N1 so that bits numbered 1 through + * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits + * (N2 + 1) x 8 through 2007 are 0. */ + n1 = 0; + for (i = 0; i < sizeof(bitmap); i++) { + if (bitmap[i]) { + n1 = i & 0xfe; + break; + } + } + n2 = n1; + for (i = sizeof(bitmap) - 1; i >= n1; i--) { + if (bitmap[i]) { + n2 = i; + break; + } + } + + /* Bitmap control */ + *pos++ = n1 | (aid0 ? 1 : 0); + /* Part Virt Bitmap */ + memcpy(pos, bitmap + n1, n2 - n1 + 1); + + tim[1] = n2 - n1 + 4; + skb_put(skb, n2 - n1); + } else { + *pos++ = aid0 ? 1 : 0; /* Bitmap control */ + *pos++ = 0; /* Part Virt Bitmap */ + } +} + + + + +struct sk_buff * ieee80211_beacon_get(struct net_device *dev, int bss_idx, + struct ieee80211_tx_control *control) +{ + struct ieee80211_local *local = dev->priv; + struct sk_buff *skb; + struct net_device *bdev; + struct ieee80211_sub_if_data *sdata = NULL; + struct ieee80211_if_norm *norm = NULL; + struct ieee80211_rate *rate; + struct rate_control_extra extra; + u8 *b_head, *b_tail; + int bh_len, bt_len; + + + spin_lock_bh(&local->sub_if_lock); + if (bss_idx < 0 || bss_idx >= local->bss_dev_count) + bdev = NULL; + else { + bdev = local->bss_devs[bss_idx]; + sdata = IEEE80211_DEV_TO_SUB_IF(bdev); + norm = &sdata->u.norm; + } + spin_unlock_bh(&local->sub_if_lock); + + if (bdev == NULL || norm == NULL || norm->beacon_head == NULL) { +#ifdef CONFIG_IEEE80211_VERBOSE_DEBUG + if (net_ratelimit()) + printk(KERN_DEBUG "no beacon data avail for idx=%d " + "(%s)\n", bss_idx, bdev ? bdev->name : "N/A"); +#endif /* CONFIG_IEEE80211_VERBOSE_DEBUG */ + return NULL; + } + + /* Assume we are generating the normal beacon locally */ + b_head = norm->beacon_head; + b_tail = norm->beacon_tail; + bh_len = norm->beacon_head_len; + bt_len = norm->beacon_tail_len; + + + skb = dev_alloc_skb(bh_len + bt_len + 256 /* maximum TIM len */); + if (!skb) + return NULL; + + memcpy(skb_put(skb, bh_len), b_head, bh_len); + + ieee80211_beacon_add_tim(local, norm, skb); + + if (b_tail) { + memcpy(skb_put(skb, bt_len), b_tail, bt_len); + } + + memset(&extra, 0, sizeof(extra)); + extra.endidx = local->num_curr_rates; + + + rate = rate_control_get_rate(dev, skb, &extra); + if (rate == NULL) { + if (net_ratelimit()) { + printk(KERN_DEBUG "%s: ieee80211_beacon_get: no rate " + "found\n", dev->name); + } + dev_kfree_skb(skb); + return NULL; + } + + control->tx_rate = (local->short_preamble && + (rate->flags & IEEE80211_RATE_PREAMBLE2)) ? + rate->val2 : rate->val; + control->antenna_sel = local->conf.antenna_sel; + control->power_level = local->conf.power_level; + control->no_ack = 1; + control->retry_limit = 1; + control->rts_cts_duration = 0; + control->clear_dst_mask = 1; + + + norm->num_beacons++; + return skb; +} + +struct sk_buff * +ieee80211_get_buffered_bc(struct net_device *dev, int bss_idx, + struct ieee80211_tx_control *control) +{ + struct ieee80211_local *local = dev->priv; + struct sk_buff *skb; + struct sta_info *sta; + ieee80211_tx_handler *handler; + struct ieee80211_txrx_data tx; + ieee80211_txrx_result res = TXRX_DROP; + struct net_device *bdev; + struct ieee80211_sub_if_data *sdata; + struct ieee80211_if_norm *bss; + + + spin_lock_bh(&local->sub_if_lock); + if (bss_idx < 0 || bss_idx >= local->bss_dev_count) { + bdev = NULL; + bss = NULL; + } else { + bdev = local->bss_devs[bss_idx]; + sdata = IEEE80211_DEV_TO_SUB_IF(bdev); + bss = &sdata->u.norm; + } + spin_unlock_bh(&local->sub_if_lock); + if (bdev == NULL || bss == NULL || bss->beacon_head == NULL) + return NULL; + + if (bss->dtim_count != 0) + return NULL; /* send buffered bc/mc only after DTIM beacon */ + skb = skb_dequeue(&bss->ps_bc_buf); + memset(control, 0, sizeof(*control)); + if (skb == NULL) + return NULL; + local->total_ps_buffered--; + + if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) { + struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; + /* more buffered multicast/broadcast frames ==> set MoreData + * flag in IEEE 802.11 header to inform PS STAs */ + hdr->frame_control |= cpu_to_le16(WLAN_FC_MOREDATA); + } + + ieee80211_tx_prepare(&tx, skb, dev, control); + sta = tx.sta; + tx.u.tx.ps_buffered = 1; + + for (handler = local->tx_handlers; *handler != NULL; handler++) { + res = (*handler)(&tx); + if (res == TXRX_DROP || res == TXRX_QUEUED) + break; + } + + if (res == TXRX_DROP) { + I802_DEBUG_INC(local->tx_handlers_drop); + dev_kfree_skb(skb); + skb = NULL; + } else if (res == TXRX_QUEUED) { + I802_DEBUG_INC(local->tx_handlers_queued); + skb = NULL; + } + + if (sta) + sta_info_release(local, sta); + + return skb; +} + + +int ieee80211_hw_config(struct net_device *dev) +{ + struct ieee80211_local *local = dev->priv; + int i, ret = 0; + +#ifdef CONFIG_IEEE80211_VERBOSE_DEBUG + printk(KERN_DEBUG "HW CONFIG: channel=%d freq=%d mode=%d " + "phymode=%d\n", local->conf.channel, local->conf.freq, + local->conf.mode, local->conf.phymode); +#endif /* CONFIG_IEEE80211_VERBOSE_DEBUG */ + + if (local->hw->config) + ret = local->hw->config(dev, &local->conf); + + for (i = 0; i < local->hw->num_modes; i++) { + struct ieee80211_hw_modes *mode = &local->hw->modes[i]; + if (mode->mode == local->conf.phymode) { + if (local->curr_rates != mode->rates) { + rate_control_clear(local); + } + local->curr_rates = mode->rates; + local->num_curr_rates = mode->num_rates; + ieee80211_prepare_rates(dev); + break; + } + } + + return ret; +} + + +struct ieee80211_conf *ieee80211_get_hw_conf(struct net_device *dev) +{ + struct ieee80211_local *local = dev->priv; + return &local->conf; +} + + +static int ieee80211_change_mtu(struct net_device *dev, int new_mtu) +{ + /* FIX: what would be proper limits for MTU? + * This interface uses 802.3 frames. */ + if (new_mtu < 256 || new_mtu > 2304 - 24 - 6) { + printk(KERN_WARNING "%s: invalid MTU %d\n", + dev->name, new_mtu); + return -EINVAL; + } + +#ifdef CONFIG_IEEE80211_VERBOSE_DEBUG + printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu); +#endif /* CONFIG_IEEE80211_VERBOSE_DEBUG */ + dev->mtu = new_mtu; + return 0; +} + + +static int ieee80211_change_mtu_apdev(struct net_device *dev, int new_mtu) +{ + /* FIX: what would be proper limits for MTU? + * This interface uses 802.11 frames. */ + if (new_mtu < 256 || new_mtu > 2304) { + printk(KERN_WARNING "%s: invalid MTU %d\n", + dev->name, new_mtu); + return -EINVAL; + } + +#ifdef CONFIG_IEEE80211_VERBOSE_DEBUG + printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu); +#endif /* CONFIG_IEEE80211_VERBOSE_DEBUG */ + dev->mtu = new_mtu; + return 0; +} + + +static void ieee80211_tx_timeout(struct net_device *dev) +{ + struct ieee80211_local *local = dev->priv; + + printk(KERN_WARNING "%s: resetting interface.\n", dev->name); + + if (local->hw->reset(dev)) + printk(KERN_ERR "%s: failed to reset interface.\n", dev->name); + else + netif_wake_queue(dev); +} + + +static int ieee80211_set_mac_address(struct net_device *dev, void *addr) +{ + struct ieee80211_local *local = dev->priv; + struct sockaddr *a = addr; + struct list_head *ptr; + int res; + + if (!local->hw->set_mac_address) + return -EOPNOTSUPP; + + res = local->hw->set_mac_address(dev, addr); + if (res) + return res; + + list_for_each(ptr, &local->sub_if_list) { + struct ieee80211_sub_if_data *sdata = + list_entry(ptr, struct ieee80211_sub_if_data, list); + memcpy(sdata->dev->dev_addr, a->sa_data, ETH_ALEN); + } + + return 0; +} + + +static struct net_device_stats *ieee80211_get_stats(struct net_device *dev) +{ + struct ieee80211_sub_if_data *sdata; + sdata = IEEE80211_DEV_TO_SUB_IF(dev); + return &(sdata->stats); +} + + +static int ieee80211_open(struct net_device *dev) +{ + struct ieee80211_sub_if_data *sdata; + struct ieee80211_local *local = dev->priv; + int res; + + sdata = IEEE80211_DEV_TO_SUB_IF(dev); + + if (local->open_count == 0) { + res = local->hw->open(sdata->master); + if (res) + return res; + ieee80211_init_scan(sdata->master); + } + local->open_count++; + + netif_start_queue(dev); + return 0; +} + + +static int ieee80211_stop(struct net_device *dev) +{ + struct ieee80211_sub_if_data *sdata; + struct ieee80211_local *local = dev->priv; + int res; + + sdata = IEEE80211_DEV_TO_SUB_IF(dev); + + netif_stop_queue(dev); + + local->open_count--; + if (local->open_count == 0) { + ieee80211_stop_scan(sdata->master); + res = local->hw->stop(sdata->master); + if (res) + return res; + } + + return 0; +} + + +static int header_parse_80211(struct sk_buff *skb, unsigned char *haddr) +{ + memcpy(haddr, skb->mac.raw + 10, ETH_ALEN); /* addr2 */ + return ETH_ALEN; +} + + +static struct net_device * +ieee80211_get_wds_dev(struct ieee80211_local *local, u8 *addr) +{ + struct list_head *ptr; + + list_for_each(ptr, &local->sub_if_list) { + struct ieee80211_sub_if_data *sdata = + list_entry(ptr, struct ieee80211_sub_if_data, list); + if (sdata->type == IEEE80211_SUB_IF_TYPE_WDS && + memcmp(addr, sdata->u.wds.remote_addr, ETH_ALEN) == 0) + return sdata->dev; + } + + return NULL; +} + + +static struct net_device * ieee80211_own_bssid(struct ieee80211_local *local, + u8 *addr) +{ + int i; + struct net_device *dev = NULL; + + spin_lock_bh(&local->sub_if_lock); + for (i = 0; i < local->bss_dev_count; i++) { + if ((memcmp(local->bss_devs[i]->dev_addr, addr, ETH_ALEN) == 0) + ) { + dev = local->bss_devs[i]; + break; + } + } + spin_unlock_bh(&local->sub_if_lock); + + return dev; +} + + + + +static struct net_device * ieee80211_sta_bssid(struct ieee80211_local *local, + u8 *addr, u8 *a1, + int *sta_multicast) +{ + struct list_head *ptr; + int multicast; + u8 *own_addr = local->mdev->dev_addr; + + multicast = a1[0] & 0x01; + + /* Try O(1) lookup for a common case of only one AP being used. */ + if (own_addr[0] == a1[0] && own_addr[1] == a1[1] && + own_addr[2] == a1[2]) { + int index = (((int) a1[3] << 16) | ((int) a1[4] << 8) | a1[5]) + - (((int) own_addr[3] << 16) | + ((int) own_addr[4] << 8) | own_addr[5]); + if (index >= 0 && index < local->conf.bss_count && + local->sta_devs[index]) { + struct net_device *dev = local->sta_devs[index]; + struct ieee80211_sub_if_data *sdata; + sdata = IEEE80211_DEV_TO_SUB_IF(dev); + if (memcmp(addr, sdata->u.sta.bssid, ETH_ALEN) == 0) { + *sta_multicast = multicast; + return dev; + } + } + } + + if (!multicast) + return NULL; + + /* Could not find station interface, resort to O(n) lookup. */ + list_for_each(ptr, &local->sub_if_list) { + struct ieee80211_sub_if_data *sdata = + list_entry(ptr, struct ieee80211_sub_if_data, list); + if (sdata->type != IEEE80211_SUB_IF_TYPE_STA) + continue; + if (!multicast && + memcmp(a1, sdata->dev->dev_addr, ETH_ALEN) != 0) + continue; + + if (memcmp(addr, sdata->u.sta.bssid, ETH_ALEN) == 0 || + (memcmp(addr, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) == 0 && + local->conf.mode == IW_MODE_ADHOC)) { + *sta_multicast = multicast; + return sdata->dev; + } + } + + return NULL; +} + + +static int ieee80211_own_addr(struct net_device *dev, u8 *addr) +{ + struct ieee80211_local *local = dev->priv; + u8 *own = dev->dev_addr; + int index; + + /* Optimization: assume that BSSID mask does not change for first + * three octets. */ + if (own[0] != addr[0] || own[1] != addr[1] || own[2] != addr[2]) + return 0; + + index = (((int) addr[3] << 16) | ((int) addr[4] << 8) | addr[5]) - + (((int) own[3] << 16) | ((int) own[4] << 8) | own[5]); + if (index >= 0 && index < local->conf.bss_count && + local->sta_devs[index]) + return 1; + + return 0; +} + + +static ieee80211_txrx_result +ieee80211_rx_h_data(struct ieee80211_txrx_data *rx) +{ + struct net_device *dev = rx->dev; + struct ieee80211_local *local = rx->local; + struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; + u16 fc, hdrlen, ethertype; + u8 *payload; + u8 dst[ETH_ALEN]; + u8 src[ETH_ALEN]; + struct sk_buff *skb = rx->skb, *skb2; + struct ieee80211_sub_if_data *sdata; + + fc = rx->fc; + if (unlikely(WLAN_FC_GET_TYPE(fc) != WLAN_FC_TYPE_DATA)) + return TXRX_CONTINUE; + + if (unlikely(!WLAN_FC_DATA_PRESENT(fc))) + return TXRX_DROP; + + hdrlen = ieee80211_get_hdrlen(fc); + + /* convert IEEE 802.11 header + possible LLC headers into Ethernet + * header + * IEEE 802.11 address fields: + * ToDS FromDS Addr1 Addr2 Addr3 Addr4 + * 0 0 DA SA BSSID n/a + * 0 1 DA BSSID SA n/a + * 1 0 BSSID SA DA n/a + * 1 1 RA TA DA SA + */ + + switch (fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) { + case WLAN_FC_TODS: + /* BSSID SA DA */ + memcpy(dst, hdr->addr3, ETH_ALEN); + memcpy(src, hdr->addr2, ETH_ALEN); + + if (unlikely(local->conf.mode != IW_MODE_MASTER || + !ieee80211_own_bssid(local, hdr->addr1))) { + printk(KERN_DEBUG "%s: dropped ToDS frame (BSSID=" + MACSTR " SA=" MACSTR " DA=" MACSTR ")\n", + dev->name, MAC2STR(hdr->addr1), + MAC2STR(hdr->addr2), MAC2STR(hdr->addr3)); + return TXRX_DROP; + } + break; + case (WLAN_FC_TODS | WLAN_FC_FROMDS): + /* RA TA DA SA */ + memcpy(dst, hdr->addr3, ETH_ALEN); + memcpy(src, hdr->addr4, ETH_ALEN); + + dev = ieee80211_get_wds_dev(local, hdr->addr2); + if (!dev || memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) != 0) { + printk(KERN_DEBUG "%s: dropped FromDS&ToDS frame (RA=" + MACSTR " TA=" MACSTR " DA=" MACSTR " SA=" + MACSTR ")\n", + rx->dev->name, MAC2STR(hdr->addr1), + MAC2STR(hdr->addr2), MAC2STR(hdr->addr3), + MAC2STR(hdr->addr4)); + return TXRX_DROP; + } + break; + case WLAN_FC_FROMDS: + /* DA BSSID SA */ + memcpy(dst, hdr->addr1, ETH_ALEN); + memcpy(src, hdr->addr3, ETH_ALEN); + + sdata = IEEE80211_DEV_TO_SUB_IF(dev); + if (sdata->type != IEEE80211_SUB_IF_TYPE_STA || + memcmp(hdr->addr3, dev->dev_addr, ETH_ALEN) == 0 || + memcmp(hdr->addr2, sdata->u.sta.bssid, ETH_ALEN) != 0) { + return TXRX_DROP; + } + break; + case 0: + /* DA SA BSSID */ + memcpy(dst, hdr->addr1, ETH_ALEN); + memcpy(src, hdr->addr2, ETH_ALEN); + + if (local->conf.mode != IW_MODE_ADHOC || + memcmp(hdr->addr3, local->bssid, ETH_ALEN) != 0) { + if (net_ratelimit()) { + printk(KERN_DEBUG "%s: dropped IBSS frame (DA=" + MACSTR " SA=" MACSTR " BSSID=" MACSTR + ")\n", + dev->name, MAC2STR(hdr->addr1), + MAC2STR(hdr->addr2), + MAC2STR(hdr->addr3)); + } + return TXRX_DROP; + } + break; + } + + payload = skb->data + hdrlen; + + if (unlikely(skb->len - hdrlen < 8)) { + if (net_ratelimit()) { + printk(KERN_DEBUG "%s: RX too short data frame " + "payload\n", dev->name); + } + return TXRX_DROP; + } + + ethertype = (payload[6] << 8) | payload[7]; + + if (likely((memcmp(payload, rfc1042_header, 6) == 0 && + ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || + memcmp(payload, bridge_tunnel_header, 6) == 0)) { + /* remove RFC1042 or Bridge-Tunnel encapsulation and + * replace EtherType */ + skb_pull(skb, hdrlen + 6); + memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); + memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); + } else { + struct ethhdr *ehdr; + unsigned short len; + skb_pull(skb, hdrlen); + len = htons(skb->len); + ehdr = (struct ethhdr *)skb_push(skb, sizeof(struct ethhdr)); + memcpy(ehdr->h_dest, dst, ETH_ALEN); + memcpy(ehdr->h_source, src, ETH_ALEN); + ehdr->h_proto = len; + } + + if (rx->sta && !rx->sta->assoc_ap && + !(rx->sta && (rx->sta->flags & WLAN_STA_WDS))) + skb->dev = rx->sta->dev; + else + skb->dev = dev; + + skb2 = NULL; + sdata = IEEE80211_DEV_TO_SUB_IF(dev); + + /* + * don't count the master since the low level code + * counts it already for us. + */ + if (skb->dev != sdata->master) { + sdata->stats.rx_packets++; + sdata->stats.rx_bytes += skb->len; + } + + if (local->bridge_packets && sdata->type != IEEE80211_SUB_IF_TYPE_WDS + && sdata->type != IEEE80211_SUB_IF_TYPE_STA) { + if (MULTICAST_ADDR(skb->data)) { + /* send multicast frames both to higher layers in + * local net stack and back to the wireless media */ + skb2 = skb_copy(skb, GFP_ATOMIC); + if (skb2 == NULL) + printk(KERN_DEBUG "%s: failed to clone " + "multicast frame\n", dev->name); + } else { + struct sta_info *dsta; + dsta = sta_info_get(local, skb->data); + if (dsta && dsta->dev == NULL) { + printk(KERN_DEBUG "Station with null dev " + "structure!\n"); + } else if (dsta && dsta->dev == dev) { + /* Destination station is associated to this + * AP, so send the frame directly to it and + * do not pass the frame to local net stack. + */ + skb2 = skb; + skb = NULL; + } + if (dsta) + sta_info_release(local, dsta); + } + } + + if (skb) { + /* deliver to local stack */ + skb->protocol = eth_type_trans(skb, dev); + memset(skb->cb, 0, sizeof(skb->cb)); + netif_rx(skb); + } + + if (skb2) { + /* send to wireless media */ + skb2->protocol = __constant_htons(ETH_P_802_3); + skb2->mac.raw = skb2->nh.raw = skb2->data; + dev_queue_xmit(skb2); + } + + return TXRX_QUEUED; +} + + +static struct ieee80211_rate * +ieee80211_get_rate(struct ieee80211_local *local, int phymode, int hw_rate) +{ + int m, r; + + for (m = 0; m < local->hw->num_modes; m++) { + struct ieee80211_hw_modes *mode = &local->hw->modes[m]; + if (mode->mode != phymode) + continue; + for (r = 0; r < mode->num_rates; r++) { + struct ieee80211_rate *rate = &mode->rates[r]; + if (rate->val == hw_rate || + (rate->flags & IEEE80211_RATE_PREAMBLE2 && + rate->val2 == hw_rate)) + return rate; + } + } + + return NULL; +} + + +void +ieee80211_rx_mgmt(struct net_device *dev, struct sk_buff *skb, + struct ieee80211_rx_status *status, u32 msg_type) +{ + struct ieee80211_local *local = dev->priv; + struct ieee80211_frame_info *fi; + size_t hlen; + struct ieee80211_sub_if_data *sdata; + + dev = local->apdev; + skb->dev = dev; + + sdata = IEEE80211_DEV_TO_SUB_IF(dev); + + if (skb_headroom(skb) < sizeof(struct ieee80211_frame_info)) { + I802_DEBUG_INC(local->rx_expand_skb_head); + if (pskb_expand_head(skb, sizeof(struct ieee80211_frame_info), + 0, GFP_ATOMIC)) { + dev_kfree_skb(skb); + return; + } + } + + hlen = sizeof(struct ieee80211_frame_info); + if (msg_type == ieee80211_msg_monitor) + hlen -= sizeof(fi->msg_type); + + fi = (struct ieee80211_frame_info *) skb_push(skb, hlen); + memset(fi, 0, hlen); + if (msg_type != ieee80211_msg_monitor) + fi->msg_type = htonl(msg_type); + fi->version = htonl(IEEE80211_FI_VERSION); + fi->length = htonl(hlen); + if (status) { +// struct timespec ts; + struct ieee80211_rate *rate; + +#if 0 + jiffies_to_timespec(status->hosttime, &ts); + fi->hosttime = cpu_to_be64(ts.tv_sec * 1000000 + + ts.tv_nsec / 1000); + fi->mactime = cpu_to_be64(status->mactime); +#endif + switch (status->phymode) { + case MODE_IEEE80211A: + fi->phytype = htonl(ieee80211_phytype_ofdm_dot11_a); + break; + case MODE_IEEE80211B: + fi->phytype = htonl(ieee80211_phytype_dsss_dot11_b); + break; + case MODE_IEEE80211G: + fi->phytype = htonl(ieee80211_phytype_pbcc_dot11_g); + break; + case MODE_ATHEROS_TURBO: + fi->phytype = + htonl(ieee80211_phytype_dsss_dot11_turbo); + break; + default: + fi->phytype = 0xAAAAAAAA; + break; + } + fi->channel = htonl(status->channel); + rate = ieee80211_get_rate(local, status->phymode, + status->rate); + if (rate) { + fi->datarate = htonl(rate->rate); + if (rate->flags & IEEE80211_RATE_PREAMBLE2) { + if (status->rate == rate->val) + fi->preamble = htonl(2); /* long */ + else if (status->rate == rate->val2) + fi->preamble = htonl(1); /* short */ + } else + fi->preamble = htonl(0); + } else { + fi->datarate = htonl(0); + fi->preamble = htonl(0); + } + + fi->antenna = htonl(status->antenna); + fi->priority = 0xffffffff; /* no clue */ + fi->ssi_type = htonl(ieee80211_ssi_raw); + fi->ssi_signal = htonl(status->ssi); + fi->ssi_noise = 0x00000000; + fi->encoding = 0; + } else { + fi->ssi_type = htonl(ieee80211_ssi_none); + } + + sdata->stats.rx_packets++; + sdata->stats.rx_bytes += skb->len; + + skb->mac.raw = skb->data; + skb->ip_summed = CHECKSUM_UNNECESSARY; + skb->pkt_type = PACKET_OTHERHOST; + skb->protocol = __constant_htons(ETH_P_802_2); + memset(skb->cb, 0, sizeof(skb->cb)); + netif_rx(skb); +} + + +int ieee80211_radar_status(struct net_device *dev, int channel, int radar, + int radar_type) +{ + struct sk_buff *skb; + struct ieee80211_radar_info *msg; + + skb = dev_alloc_skb(sizeof(struct ieee80211_frame_info) + + sizeof(struct ieee80211_radar_info)); + + if (skb == NULL) + return -ENOMEM; + skb_reserve(skb, sizeof(struct ieee80211_frame_info)); + + msg = (struct ieee80211_radar_info *) + skb_put(skb, sizeof(struct ieee80211_radar_info)); + msg->channel = channel; + msg->radar = radar; + msg->radar_type = radar_type; + + ieee80211_rx_mgmt(dev, skb, 0, ieee80211_msg_radar); + return 0; +} + + +int ieee80211_set_aid_for_sta(struct net_device *dev, u8 *peer_address, + u16 aid) +{ + struct sk_buff *skb; + struct ieee80211_msg_set_aid_for_sta *msg; + + skb = dev_alloc_skb(sizeof(struct ieee80211_frame_info) + + sizeof(struct ieee80211_msg_set_aid_for_sta)); + + if (skb == NULL) + return -ENOMEM; + skb_reserve(skb, sizeof(struct ieee80211_frame_info)); + + msg = (struct ieee80211_msg_set_aid_for_sta *) + skb_put(skb, sizeof(struct ieee80211_msg_set_aid_for_sta)); + memcpy(msg->sta_address, peer_address, ETH_ALEN); + msg->aid = aid; + + ieee80211_rx_mgmt(dev, skb, 0, ieee80211_msg_set_aid_for_sta); + return 0; +} + + +static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta) +{ + struct ieee80211_sub_if_data *sdata; + sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev); + + if (sdata->bss) + atomic_inc(&sdata->bss->num_sta_ps); + sta->flags |= WLAN_STA_PS; + sta->pspoll = 0; +#ifdef IEEE80211_VERBOSE_DEBUG_PS + printk(KERN_DEBUG "%s: STA " MACSTR " aid %d enters power " + "save mode\n", dev->name, MAC2STR(sta->addr), sta->aid); +#endif /* IEEE80211_VERBOSE_DEBUG_PS */ +} + + +static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta) +{ + struct ieee80211_local *local = dev->priv; + struct sk_buff *skb; + int sent = 0; + struct ieee80211_sub_if_data *sdata; + struct ieee80211_tx_packet_data *pkt_data; + + sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev); + if (sdata->bss) + atomic_dec(&sdata->bss->num_sta_ps); + sta->flags &= ~(WLAN_STA_PS | WLAN_STA_TIM); + sta->pspoll = 0; + if (!skb_queue_empty(&sta->ps_tx_buf) && local->hw->set_tim) + local->hw->set_tim(dev, sta->aid, 0); +#ifdef IEEE80211_VERBOSE_DEBUG_PS + printk(KERN_DEBUG "%s: STA " MACSTR " aid %d exits power " + "save mode\n", dev->name, MAC2STR(sta->addr), sta->aid); +#endif /* IEEE80211_VERBOSE_DEBUG_PS */ + /* Send all buffered frames to the station */ + while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) { + pkt_data = (struct ieee80211_tx_packet_data *) skb->cb; + sent++; + pkt_data->control.requeue = 1; + dev_queue_xmit(skb); + } + while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) { + pkt_data = (struct ieee80211_tx_packet_data *) skb->cb; + local->total_ps_buffered--; + sent++; +#ifdef IEEE80211_VERBOSE_DEBUG_PS + printk(KERN_DEBUG "%s: STA " MACSTR " aid %d send PS frame " + "since STA not sleeping anymore\n", dev->name, + MAC2STR(sta->addr), sta->aid); +#endif /* IEEE80211_VERBOSE_DEBUG_PS */ + pkt_data->control.requeue = 1; + dev_queue_xmit(skb); + } + + return sent; +} + + +static ieee80211_txrx_result +ieee80211_rx_h_ieee80211_rx_h_ps_poll(struct ieee80211_txrx_data *rx) +{ + struct sk_buff *skb; + int no_pending_pkts; + + if (likely(!rx->sta || WLAN_FC_GET_TYPE(rx->fc) != WLAN_FC_TYPE_CTRL || + WLAN_FC_GET_STYPE(rx->fc) != WLAN_FC_STYPE_PSPOLL)) + return TXRX_CONTINUE; + + skb = skb_dequeue(&rx->sta->tx_filtered); + if (skb == NULL) { + skb = skb_dequeue(&rx->sta->ps_tx_buf); + if (skb) + rx->local->total_ps_buffered--; + } + no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) && + skb_queue_empty(&rx->sta->ps_tx_buf); + + if (skb) { + struct ieee80211_hdr *hdr = + (struct ieee80211_hdr *) skb->data; + + /* tell TX path to send one frame even though the STA may + * still remain is PS mode after this frame exchange */ + rx->sta->pspoll = 1; + +#ifdef IEEE80211_VERBOSE_DEBUG_PS + printk(KERN_DEBUG "STA " MACSTR " aid %d: PS Poll (entries " + "after %d)\n", + MAC2STR(rx->sta->addr), rx->sta->aid, + skb_queue_len(&rx->sta->ps_tx_buf)); +#endif /* IEEE80211_VERBOSE_DEBUG_PS */ + + /* Use MoreData flag to indicate whether there are more + * buffered frames for this STA */ + if (no_pending_pkts) { + hdr->frame_control &= cpu_to_le16(~WLAN_FC_MOREDATA); + rx->sta->flags &= ~WLAN_STA_TIM; + } else + hdr->frame_control |= cpu_to_le16(WLAN_FC_MOREDATA); + + dev_queue_xmit(skb); + + if (no_pending_pkts && rx->local->hw->set_tim) + rx->local->hw->set_tim(rx->dev, rx->sta->aid, 0); +#ifdef IEEE80211_VERBOSE_DEBUG_PS + } else if (!rx->u.rx.sent_ps_buffered) { + printk(KERN_DEBUG "%s: STA " MACSTR " sent PS Poll even " + "though there is no buffered frames for it\n", + rx->dev->name, MAC2STR(rx->sta->addr)); +#endif /* IEEE80211_VERBOSE_DEBUG_PS */ + + } + + /* Free PS Poll skb here instead of returning TXRX_DROP that would + * count as an dropped frame. */ + dev_kfree_skb(rx->skb); + + return TXRX_QUEUED; +} + + +static inline struct ieee80211_fragment_entry * +ieee80211_reassemble_add(struct ieee80211_local *local, + unsigned int frag, unsigned int seq, int rx_queue, + struct sk_buff **skb) +{ + struct ieee80211_fragment_entry *entry; + int idx; + + idx = local->fragment_next; + entry = &local->fragments[local->fragment_next++]; + if (local->fragment_next >= IEEE80211_FRAGMENT_MAX) + local->fragment_next = 0; + + if (entry->skb) { +#ifdef CONFIG_IEEE80211_DEBUG + struct ieee80211_hdr *hdr = + (struct ieee80211_hdr *) entry->skb->data; + printk(KERN_DEBUG "%s: RX reassembly removed oldest " + "fragment entry (idx=%d age=%lu seq=%d last_frag=%d " + "addr1=" MACSTR " addr2=" MACSTR "\n", + local->mdev->name, idx, + jiffies - entry->first_frag_time, entry->seq, + entry->last_frag, MAC2STR(hdr->addr1), + MAC2STR(hdr->addr2)); +#endif /* CONFIG_IEEE80211_DEBUG */ + dev_kfree_skb(entry->skb); + } + + entry->skb = *skb; + *skb = NULL; + entry->first_frag_time = jiffies; + entry->seq = seq; + entry->rx_queue = rx_queue; + entry->last_frag = frag; + entry->ccmp = 0; + + return entry; +} + + +static inline struct ieee80211_fragment_entry * +ieee80211_reassemble_find(struct ieee80211_local *local, + u16 fc, unsigned int frag, unsigned int seq, + int rx_queue, struct ieee80211_hdr *hdr) +{ + struct ieee80211_fragment_entry *entry; + int i, idx; + + idx = local->fragment_next; + for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { + struct ieee80211_hdr *f_hdr; + u16 f_fc; + + idx--; + if (idx < 0) + idx = IEEE80211_FRAGMENT_MAX - 1; + + entry = &local->fragments[idx]; + if (!entry->skb || entry->seq != seq || + entry->rx_queue != rx_queue || + entry->last_frag + 1 != frag) + continue; + + f_hdr = (struct ieee80211_hdr *) entry->skb->data; + f_fc = le16_to_cpu(f_hdr->frame_control); + + if (WLAN_FC_GET_TYPE(fc) != WLAN_FC_GET_TYPE(f_fc) || + memcmp(hdr->addr1, f_hdr->addr1, ETH_ALEN) != 0 || + memcmp(hdr->addr2, f_hdr->addr2, ETH_ALEN) != 0) + continue; + + if (entry->first_frag_time + 2 * HZ < jiffies) { + dev_kfree_skb(entry->skb); + entry->skb = NULL; + continue; + } + return entry; + } + + return NULL; +} + + +static ieee80211_txrx_result +ieee80211_rx_h_defragment(struct ieee80211_txrx_data *rx) +{ + struct ieee80211_hdr *hdr; + u16 sc; + unsigned int frag, seq; + struct ieee80211_fragment_entry *entry; + + hdr = (struct ieee80211_hdr *) rx->skb->data; + sc = le16_to_cpu(hdr->seq_ctrl); + frag = WLAN_GET_SEQ_FRAG(sc); + + if (likely((!(rx->fc & WLAN_FC_MOREFRAG) && frag == 0) || + (rx->skb)->len < 24 || MULTICAST_ADDR(hdr->addr1))) { + /* not fragmented */ + goto out; + } + I802_DEBUG_INC(rx->local->rx_handlers_fragments); + + seq = WLAN_GET_SEQ_SEQ(sc); + + if (frag == 0) { + /* This is the first fragment of a new frame. */ + entry = ieee80211_reassemble_add(rx->local, frag, seq, + rx->u.rx.queue, &(rx->skb)); + if (rx->key && rx->key->alg == ALG_CCMP && + (rx->fc & WLAN_FC_ISWEP)) { + /* Store CCMP PN so that we can verify that the next + * fragment has a sequential PN value. */ + entry->ccmp = 1; + memcpy(entry->last_pn, + rx->key->u.ccmp.rx_pn[rx->u.rx.queue], + CCMP_PN_LEN); + } + return TXRX_QUEUED; + } + + /* This is a fragment for a frame that should already be pending in + * fragment cache. Add this fragment to the end of the pending entry. + */ + entry = ieee80211_reassemble_find(rx->local, rx->fc, frag, seq, + rx->u.rx.queue, hdr); + if (!entry) { + I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); + return TXRX_DROP; + } + + /* Verify that MPDUs within one MSDU have sequential PN values. + * (IEEE 802.11i, 8.3.3.4.5) */ + if (entry->ccmp) { + int i; + u8 pn[CCMP_PN_LEN], *rpn; + if (rx->key == NULL || rx->key->alg != ALG_CCMP) + return TXRX_DROP; + memcpy(pn, entry->last_pn, CCMP_PN_LEN); + for (i = CCMP_PN_LEN - 1; i >= 0; i--) { + pn[i]++; + if (pn[i]) + break; + } + rpn = rx->key->u.ccmp.rx_pn[rx->u.rx.queue]; + if (memcmp(pn, rpn, CCMP_PN_LEN) != 0) { + printk(KERN_DEBUG "%s: defrag: CCMP PN not sequential" + " A2=" MACSTR " PN=%02x%02x%02x%02x%02x%02x " + "(expected %02x%02x%02x%02x%02x%02x)\n", + rx->dev->name, MAC2STR(hdr->addr2), + rpn[0], rpn[1], rpn[2], rpn[3], rpn[4], rpn[5], + pn[0], pn[1], pn[2], pn[3], pn[4], pn[5]); + return TXRX_DROP; + } + memcpy(entry->last_pn, pn, CCMP_PN_LEN); + } + + /* TODO: could gather list of skb's and reallocate data buffer only + * after finding out the total length of the frame */ + skb_pull(rx->skb, ieee80211_get_hdrlen(rx->fc)); + if (skb_tailroom(entry->skb) < rx->skb->len) { + I802_DEBUG_INC(rx->local->rx_expand_skb_head2); + if (unlikely(pskb_expand_head(entry->skb, 0, rx->skb->len, + GFP_ATOMIC))) { + I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); + return TXRX_DROP; + } + } + memcpy(skb_put(entry->skb, rx->skb->len), rx->skb->data, rx->skb->len); + entry->last_frag = frag; + dev_kfree_skb(rx->skb); + + if (rx->fc & WLAN_FC_MOREFRAG) { + rx->skb = NULL; + return TXRX_QUEUED; + } + + /* Complete frame has been reassembled - process it now */ + rx->skb = entry->skb; + rx->fragmented = 1; + entry->skb = NULL; + + out: + if (rx->sta) + rx->sta->rx_packets++; + if (MULTICAST_ADDR(hdr->addr1)) + rx->local->dot11MulticastReceivedFrameCount++; +#ifdef IEEE80211_LEDS + else + ieee80211_rx_led(2, rx->dev); +#endif /* IEEE80211_LEDS */ + return TXRX_CONTINUE; +} + + +static ieee80211_txrx_result +ieee80211_rx_h_monitor(struct ieee80211_txrx_data *rx) +{ + if (rx->local->conf.mode == IW_MODE_MONITOR) { + ieee80211_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status, + ieee80211_msg_monitor); + return TXRX_QUEUED; + } + + return TXRX_CONTINUE; +} + + +static ieee80211_txrx_result +ieee80211_rx_h_check(struct ieee80211_txrx_data *rx) +{ + struct ieee80211_hdr *hdr; + int always_sta_key; + hdr = (struct ieee80211_hdr *) rx->skb->data; + + /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */ + if (rx->sta && !MULTICAST_ADDR(hdr->addr1)) { + if (unlikely(rx->fc & WLAN_FC_RETRY && + rx->sta->last_seq_ctrl[rx->u.rx.queue] == + hdr->seq_ctrl)) { + rx->local->dot11FrameDuplicateCount++; + rx->sta->num_duplicates++; + return TXRX_DROP; + } else + rx->sta->last_seq_ctrl[rx->u.rx.queue] = hdr->seq_ctrl; + } + + if (rx->local->hw->rx_includes_fcs && rx->skb->len > FCS_LEN) + skb_trim(rx->skb, rx->skb->len - FCS_LEN); + + if (unlikely(rx->skb->len < 16)) { + I802_DEBUG_INC(rx->local->rx_handlers_drop_short); + return TXRX_DROP; + } + + /* Filter out foreign unicast packets when in promiscuous mode. + * FIX: Filter out multicast to foreign BSSID. */ + if (rx->local->conf.mode == IW_MODE_INFRA && + !MULTICAST_ADDR(hdr->addr1) && + !ieee80211_own_addr(rx->dev, hdr->addr1)) + return TXRX_DROP; + + /* Drop disallowed frame classes based on STA auth/assoc state; + * IEEE 802.11, Chap 5.5. + * + * 80211.o does filtering only based on association state, i.e., it + * drops Class 3 frames from not associated stations. hostapd sends + * deauth/disassoc frames when needed. In addition, hostapd is + * responsible for filtering on both auth and assoc states. + */ + if (unlikely((WLAN_FC_GET_TYPE(rx->fc) == WLAN_FC_TYPE_DATA || + (WLAN_FC_GET_TYPE(rx->fc) == WLAN_FC_TYPE_CTRL && + WLAN_FC_GET_STYPE(rx->fc) == WLAN_FC_STYPE_PSPOLL)) && + rx->local->conf.mode != IW_MODE_ADHOC && + (!rx->sta || !(rx->sta->flags & WLAN_STA_ASSOC)))) { + if (!(rx->fc & WLAN_FC_FROMDS) && !(rx->fc & WLAN_FC_TODS)) { + /* Drop IBSS frames silently. */ + return TXRX_DROP; + } + + ieee80211_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status, + ieee80211_msg_sta_not_assoc); + return TXRX_QUEUED; + } + + if (rx->local->conf.mode == IW_MODE_INFRA) + always_sta_key = 0; + else + always_sta_key = 1; + + if (rx->sta && rx->sta->key && always_sta_key) { + rx->key = rx->sta->key; + } else { + if (!rx->sdata) { + printk(KERN_DEBUG "%s: sdata was null in packet!!\n", + rx->dev->name); + printk(KERN_DEBUG "%s: Addr1: " MACSTR "\n", + rx->dev->name, MAC2STR(hdr->addr1)); + printk(KERN_DEBUG "%s: Addr2: " MACSTR "\n", + rx->dev->name, MAC2STR(hdr->addr2)); + printk(KERN_DEBUG "%s: Addr3: " MACSTR "\n", + rx->dev->name, MAC2STR(hdr->addr3)); + return TXRX_DROP; + } + if (rx->sta && rx->sta->key) + rx->key = rx->sta->key; + else + rx->key = rx->sdata->default_key; + + if (rx->local->hw->wep_include_iv && + rx->fc & WLAN_FC_ISWEP) { + int keyidx = ieee80211_wep_get_keyidx(rx->skb); + + if (keyidx >= 0 && keyidx < NUM_DEFAULT_KEYS && + (rx->sta == NULL || rx->sta->key == NULL || + keyidx > 0)) { + rx->key = rx->sdata->keys[keyidx]; + } + if (!rx->key) { + printk(KERN_DEBUG "%s: RX WEP frame with " + "unknown keyidx %d (A1=" MACSTR " A2=" + MACSTR " A3=" MACSTR ")\n", + rx->dev->name, keyidx, + MAC2STR(hdr->addr1), + MAC2STR(hdr->addr2), + MAC2STR(hdr->addr3)); + ieee80211_rx_mgmt( + rx->dev, rx->skb, rx->u.rx.status, + ieee80211_msg_wep_frame_unknown_key); + return TXRX_QUEUED; + } + } + } + + if (rx->fc & WLAN_FC_ISWEP && rx->key) { + rx->key->tx_rx_count++; + if (unlikely(rx->local->key_tx_rx_threshold && + rx->key->tx_rx_count > + rx->local->key_tx_rx_threshold)) { + ieee80211_key_threshold_notify(rx->dev, rx->key, + rx->sta); + } + } + + return TXRX_CONTINUE; +} + + +static ieee80211_txrx_result +ieee80211_rx_h_sta_process(struct ieee80211_txrx_data *rx) +{ + struct sta_info *sta = rx->sta; + struct net_device *dev = rx->dev; + struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; + + if (!sta) + return TXRX_CONTINUE; + + /* Update last_rx only for IBSS packets which are for the current + * BSSID to avoid keeping the current IBSS network alive in cases where + * other STAs are using different BSSID. */ + if (rx->local->conf.mode == IW_MODE_ADHOC) { + u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len); + if (memcmp(bssid, rx->local->bssid, ETH_ALEN) == 0) + sta->last_rx = jiffies; + } else + if (!MULTICAST_ADDR(hdr->addr1) || + rx->local->conf.mode == IW_MODE_INFRA) { + /* Update last_rx only for unicast frames in order to prevent + * the Probe Request frames (the only broadcast frames from a + * STA in infrastructure mode) from keeping a connection alive. + */ + sta->last_rx = jiffies; + } + sta->rx_fragments++; + sta->rx_bytes += rx->skb->len; + sta->last_rssi = rx->u.rx.status->ssi; + + if (!(rx->fc & WLAN_FC_MOREFRAG)) { + /* Change STA power saving mode only in the end of a frame + * exchange sequence */ + if ((sta->flags & WLAN_STA_PS) && !(rx->fc & WLAN_FC_PWRMGT)) + rx->u.rx.sent_ps_buffered += ap_sta_ps_end(dev, sta); + else if (!(sta->flags & WLAN_STA_PS) && + (rx->fc & WLAN_FC_PWRMGT)) + ap_sta_ps_start(dev, sta); + } + + /* Drop data::nullfunc frames silently, since they are used only to + * control station power saving mode. */ + if (WLAN_FC_GET_TYPE(rx->fc) == WLAN_FC_TYPE_DATA && + WLAN_FC_GET_STYPE(rx->fc) == WLAN_FC_STYPE_NULLFUNC) { + I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); + /* Update counter and free packet here to avoid counting this + * as a dropped packed. */ + sta->rx_packets++; + dev_kfree_skb(rx->skb); + return TXRX_QUEUED; + } + + return TXRX_CONTINUE; +} + + +static ieee80211_txrx_result +ieee80211_rx_h_wep_weak_iv_detection(struct ieee80211_txrx_data *rx) +{ + if (!rx->sta || !(rx->fc & WLAN_FC_ISWEP) || + WLAN_FC_GET_TYPE(rx->fc) != WLAN_FC_TYPE_DATA || !rx->key || + rx->key->alg != ALG_WEP) + return TXRX_CONTINUE; + + /* Check for weak IVs, if hwaccel did not remove IV from the frame */ + if (rx->local->hw->wep_include_iv || + rx->key->force_sw_encrypt || rx->local->conf.sw_decrypt) { + u8 *iv = ieee80211_wep_is_weak_iv(rx->skb, rx->key); + if (iv) { + rx->sta->wep_weak_iv_count++; + } + } + + return TXRX_CONTINUE; +} + + +static ieee80211_txrx_result +ieee80211_rx_h_wep_decrypt(struct ieee80211_txrx_data *rx) +{ + /* If the device handles decryption totally, skip this test */ + if (rx->local->hw->device_hides_wep) + return TXRX_CONTINUE; + + if ((rx->key && rx->key->alg != ALG_WEP) || + !(rx->fc & WLAN_FC_ISWEP) || + (WLAN_FC_GET_TYPE(rx->fc) != WLAN_FC_TYPE_DATA && + (WLAN_FC_GET_TYPE(rx->fc) != WLAN_FC_TYPE_MGMT || + WLAN_FC_GET_STYPE(rx->fc) != WLAN_FC_STYPE_AUTH))) + return TXRX_CONTINUE; + + if (!rx->key) { + printk(KERN_DEBUG "%s: RX WEP frame, but no key set\n", + rx->dev->name); + return TXRX_DROP; + } + + if (!(rx->u.rx.status->flag & RX_FLAG_DECRYPTED) || + rx->key->force_sw_encrypt || rx->local->conf.sw_decrypt) { + if (ieee80211_wep_decrypt(rx->local, rx->skb, rx->key)) { + printk(KERN_DEBUG "%s: RX WEP frame, decrypt " + "failed\n", rx->dev->name); + return TXRX_DROP; + } + } else if (rx->local->hw->wep_include_iv) { + ieee80211_wep_remove_iv(rx->local, rx->skb, rx->key); + /* remove ICV */ + skb_trim(rx->skb, rx->skb->len - 4); + } + + return TXRX_CONTINUE; +} + + +static ieee80211_txrx_result +ieee80211_rx_h_802_1x_pae(struct ieee80211_txrx_data *rx) +{ + if (rx->sdata->eapol && ieee80211_is_eapol(rx->skb) && + rx->local->conf.mode != IW_MODE_INFRA) { + /* Pass both encrypted and unencrypted EAPOL frames to user + * space for processing. */ + ieee80211_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status, + ieee80211_msg_normal); + return TXRX_QUEUED; + } + + if (unlikely(rx->sdata->ieee802_1x && + WLAN_FC_GET_TYPE(rx->fc) == WLAN_FC_TYPE_DATA && + WLAN_FC_GET_STYPE(rx->fc) != WLAN_FC_STYPE_NULLFUNC && + (!rx->sta || !(rx->sta->flags & WLAN_STA_AUTHORIZED)) && + !ieee80211_is_eapol(rx->skb))) { +#ifdef CONFIG_IEEE80211_DEBUG + struct ieee80211_hdr *hdr = + (struct ieee80211_hdr *) rx->skb->data; + printk(KERN_DEBUG "%s: dropped frame from " MACSTR + " (unauthorized port)\n", rx->dev->name, + MAC2STR(hdr->addr2)); +#endif /* CONFIG_IEEE80211_DEBUG */ + return TXRX_DROP; + } + + return TXRX_CONTINUE; +} + + +static ieee80211_txrx_result +ieee80211_rx_h_drop_unencrypted(struct ieee80211_txrx_data *rx) +{ + /* If the device handles decryption totally, skip this test */ + if (rx->local->hw->device_hides_wep) + return TXRX_CONTINUE; + + /* Drop unencrypted frames if key is set. */ + if (unlikely(!(rx->fc & WLAN_FC_ISWEP) && + WLAN_FC_GET_TYPE(rx->fc) == WLAN_FC_TYPE_DATA && + WLAN_FC_GET_STYPE(rx->fc) != WLAN_FC_STYPE_NULLFUNC && + (rx->key || rx->sdata->drop_unencrypted) && + (rx->sdata->eapol == 0 || + !ieee80211_is_eapol(rx->skb)))) { + printk(KERN_DEBUG "%s: RX non-WEP frame, but expected " + "encryption\n", rx->dev->name); + return TXRX_DROP; + } + return TXRX_CONTINUE; +} + + +static ieee80211_txrx_result +ieee80211_rx_h_mgmt(struct ieee80211_txrx_data *rx) +{ + struct ieee80211_sub_if_data *sdata; + sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); + if (sdata->type == IEEE80211_SUB_IF_TYPE_STA) { + ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status); + } else { + /* Management frames are sent to hostapd for processing */ + ieee80211_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status, + ieee80211_msg_normal); + } + return TXRX_QUEUED; +} + + +static ieee80211_txrx_result +ieee80211_rx_h_passive_scan(struct ieee80211_txrx_data *rx) +{ + struct ieee80211_local *local = rx->local; + struct sk_buff *skb = rx->skb; + + if (unlikely(local->sta_scanning != 0)) { + ieee80211_sta_rx_scan(rx->dev, skb, rx->u.rx.status); + return TXRX_QUEUED; + } + + if (WLAN_FC_GET_TYPE(rx->fc) == WLAN_FC_TYPE_DATA) + local->scan.txrx_count++; + if (unlikely(local->scan.in_scan != 0 && + rx->u.rx.status->freq == local->scan.freq)) { + struct ieee80211_hdr *hdr; + u16 fc; + + local->scan.rx_packets++; + + hdr = (struct ieee80211_hdr *) skb->data; + fc = le16_to_cpu(hdr->frame_control); + + if (WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_MGMT && + WLAN_FC_GET_STYPE(fc) == WLAN_FC_STYPE_BEACON) { + local->scan.rx_beacon++; + /* Need to trim FCS here because it is normally + * removed only after this passive scan handler. */ + if (rx->local->hw->rx_includes_fcs && + rx->skb->len > FCS_LEN) + skb_trim(rx->skb, rx->skb->len - FCS_LEN); + + ieee80211_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status, + ieee80211_msg_passive_scan); + return TXRX_QUEUED; + } else { + I802_DEBUG_INC(local->rx_handlers_drop_passive_scan); + return TXRX_DROP; + } + } + + return TXRX_CONTINUE; +} + + +static u8 * ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len) +{ + u16 fc; + + if (len < 24) + return NULL; + + fc = le16_to_cpu(hdr->frame_control); + + switch (WLAN_FC_GET_TYPE(fc)) { + case WLAN_FC_TYPE_DATA: + switch (fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) { + case WLAN_FC_TODS: + return hdr->addr1; + case (WLAN_FC_TODS | WLAN_FC_FROMDS): + return NULL; + case WLAN_FC_FROMDS: + return hdr->addr2; + case 0: + return hdr->addr3; + } + break; + case WLAN_FC_TYPE_MGMT: + return hdr->addr3; + case WLAN_FC_TYPE_CTRL: + if (WLAN_FC_GET_STYPE(fc) == WLAN_FC_STYPE_PSPOLL) + return hdr->addr1; + else + return NULL; + } + + return NULL; +} + + +static struct net_device * ieee80211_get_rx_dev(struct ieee80211_local *local, + struct ieee80211_hdr *hdr, + size_t len, int *sta_broadcast) +{ + u8 *bssid; + struct net_device *dev; + u16 fc; + + bssid = ieee80211_get_bssid(hdr, len); + if (bssid) { + dev = ieee80211_own_bssid(local, bssid); + if (!dev && (local->conf.mode == IW_MODE_INFRA || + local->conf.mode == IW_MODE_ADHOC)) + dev = ieee80211_sta_bssid(local, bssid, hdr->addr1, + sta_broadcast); + if (dev) + return dev; + } + + if (len >= 30) { + fc = le16_to_cpu(hdr->frame_control); + if (WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_DATA && + (fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) == + (WLAN_FC_TODS | WLAN_FC_FROMDS)) { + dev = ieee80211_get_wds_dev(local, hdr->addr2); + if (dev) + return dev; + } + } + + /* Default to default device if nothing else matches */ + return local->wdev; +} + + +static void ieee80211_rx_michael_mic_report(struct net_device *dev, + struct ieee80211_hdr *hdr, + struct sta_info *sta, + struct ieee80211_txrx_data *rx) +{ + int keyidx, hdrlen; + + hdrlen = ieee80211_get_hdrlen_from_skb(rx->skb); + if (rx->skb->len >= hdrlen + 4) + keyidx = rx->skb->data[hdrlen + 3] >> 6; + else + keyidx = -1; + + /* TODO: verify that this is not triggered by fragmented + * frames (hw does not verify MIC for them). */ + printk(KERN_DEBUG "%s: TKIP hwaccel reported Michael MIC " + "failure from " MACSTR " to " MACSTR " keyidx=%d\n", + dev->name, MAC2STR(hdr->addr2), MAC2STR(hdr->addr1), keyidx); + + if (sta == NULL) { + /* Some hardware versions seem to generate incorrect + * Michael MIC reports; ignore them to avoid triggering + * countermeasures. */ + printk(KERN_DEBUG "%s: ignored spurious Michael MIC " + "error for unknown address " MACSTR "\n", + dev->name, MAC2STR(hdr->addr2)); + goto ignore; + } + + if (!(rx->fc & WLAN_FC_ISWEP)) { + printk(KERN_DEBUG "%s: ignored spurious Michael MIC " + "error for a frame with no ISWEP flag (src " + MACSTR ")\n", dev->name, MAC2STR(hdr->addr2)); + goto ignore; + } + + if (rx->local->hw->wep_include_iv && + rx->local->conf.mode == IW_MODE_MASTER) { + int keyidx = ieee80211_wep_get_keyidx(rx->skb); + /* AP with Pairwise keys support should never receive Michael + * MIC errors for non-zero keyidx because these are reserved + * for group keys and only the AP is sending real multicast + * frames in BSS. */ + if (keyidx) { + printk(KERN_DEBUG "%s: ignored Michael MIC error for " + "a frame with non-zero keyidx (%d) (src " MACSTR + ")\n", dev->name, keyidx, MAC2STR(hdr->addr2)); + goto ignore; + } + } + + if (WLAN_FC_GET_TYPE(rx->fc) != WLAN_FC_TYPE_DATA && + (WLAN_FC_GET_TYPE(rx->fc) != WLAN_FC_TYPE_MGMT || + WLAN_FC_GET_STYPE(rx->fc) != WLAN_FC_STYPE_AUTH)) { + printk(KERN_DEBUG "%s: ignored spurious Michael MIC " + "error for a frame that cannot be encrypted " + "(fc=0x%04x) (src " MACSTR ")\n", + dev->name, rx->fc, MAC2STR(hdr->addr2)); + goto ignore; + } + + do { + union iwreq_data wrqu; + char *buf = kmalloc(128, GFP_ATOMIC); + if (buf == NULL) + break; + + /* TODO: needed parameters: count, key type, TSC */ + sprintf(buf, "MLME-MICHAELMICFAILURE.indication(" + "keyid=%d %scast addr=" MACSTR ")", + keyidx, hdr->addr1[0] & 0x01 ? "broad" : "uni", + MAC2STR(hdr->addr2)); + memset(&wrqu, 0, sizeof(wrqu)); + wrqu.data.length = strlen(buf); + wireless_send_event(rx->dev, IWEVCUSTOM, &wrqu, buf); + kfree(buf); + } while (0); + + /* TODO: consider verifying the MIC error report with software + * implementation if we get too many spurious reports from the + * hardware. */ + ieee80211_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status, + ieee80211_msg_michael_mic_failure); + return; + + ignore: + dev_kfree_skb(rx->skb); + rx->skb = NULL; +} + + +static void ieee80211_sta_rx_broadcast(struct ieee80211_txrx_data *rx) +{ + struct ieee80211_local *local = rx->dev->priv; + u8 *_bssid, bssid[ETH_ALEN]; + struct sk_buff *orig_skb = rx->skb, *skb; + struct ieee80211_hdr *hdr; + ieee80211_rx_handler *handler; + ieee80211_txrx_result res; + struct list_head *ptr; + + hdr = (struct ieee80211_hdr *) orig_skb->data; + _bssid = ieee80211_get_bssid(hdr, orig_skb->len); + if (_bssid == NULL) { + dev_kfree_skb(orig_skb); + return; + } + memcpy(bssid, _bssid, ETH_ALEN); + + list_for_each(ptr, &local->sub_if_list) { + struct ieee80211_sub_if_data *sdata = + list_entry(ptr, struct ieee80211_sub_if_data, list); + if (sdata->type != IEEE80211_SUB_IF_TYPE_STA || + (memcmp(bssid, sdata->u.sta.bssid, ETH_ALEN) != 0 && + !(bssid[0] & 0x01))) + continue; + + skb = skb_copy(orig_skb, GFP_ATOMIC); + if (skb == NULL) { + if (net_ratelimit()) { + printk(KERN_DEBUG "%s: failed to copy " + "multicast frame for %s", + rx->dev->name, sdata->dev->name); + } + continue; + } + + hdr = (struct ieee80211_hdr *) skb->data; + rx->skb = skb; + rx->dev = sdata->dev; + rx->sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); + + res = TXRX_DROP; + for (handler = local->rx_handlers; *handler != NULL; handler++) + { + res = (*handler)(rx); + if (res == TXRX_DROP || res == TXRX_QUEUED) + break; + } + + if (res == TXRX_DROP || *handler == NULL) + dev_kfree_skb(skb); + } + + dev_kfree_skb(orig_skb); +} + + +/* + * This is the receive path handler. It is called by a low level driver when an + * 802.11 MPDU is received from the hardware. + */ +void ieee80211_rx(struct net_device *dev, struct sk_buff *skb, + struct ieee80211_rx_status *status) +{ + struct ieee80211_local *local = dev->priv; + struct sta_info *sta; + struct ieee80211_hdr *hdr; + ieee80211_rx_handler *handler; + struct ieee80211_txrx_data rx; + ieee80211_txrx_result res = TXRX_DROP; + u16 type; + int sta_broadcast = 0; + + hdr = (struct ieee80211_hdr *) skb->data; + memset(&rx, 0, sizeof(rx)); + rx.skb = skb; + rx.local = local; + if (skb->len >= 16) { + sta = rx.sta = sta_info_get(local, hdr->addr2); + if (unlikely(sta == NULL && + local->conf.mode == IW_MODE_ADHOC)) { + u8 *bssid = ieee80211_get_bssid(hdr, skb->len); + if (bssid && + memcmp(bssid, local->bssid, ETH_ALEN) == 0) + sta = rx.sta = + ieee80211_ibss_add_sta(dev, skb, bssid, + hdr->addr2); + } + } else + sta = rx.sta = NULL; + if (sta && !sta->assoc_ap && !(sta->flags & WLAN_STA_WDS)) + rx.dev = sta->dev; + else + rx.dev = ieee80211_get_rx_dev(local, hdr, skb->len, + &sta_broadcast); + + rx.sdata = IEEE80211_DEV_TO_SUB_IF(rx.dev); + rx.u.rx.status = status; + rx.fc = skb->len >= 2 ? le16_to_cpu(hdr->frame_control) : 0; + type = WLAN_FC_GET_TYPE(rx.fc); + if (type == WLAN_FC_TYPE_DATA || type == WLAN_FC_TYPE_MGMT) + local->dot11ReceivedFragmentCount++; + if (sta_broadcast) { + ieee80211_sta_rx_broadcast(&rx); + goto end; + } + + if ((status->flag & RX_FLAG_MMIC_ERROR)) { + ieee80211_rx_michael_mic_report(dev, hdr, sta, &rx); + goto end; + } + + for (handler = local->rx_handlers; *handler != NULL; handler++) { + res = (*handler)(&rx); + if (res != TXRX_CONTINUE) { + if (res == TXRX_DROP) { + I802_DEBUG_INC(local->rx_handlers_drop); + if (sta) + sta->rx_dropped++; + } + if (res == TXRX_QUEUED) + I802_DEBUG_INC(local->rx_handlers_queued); + break; + } + } + + if (res == TXRX_DROP || *handler == NULL) + dev_kfree_skb(skb); + + end: + if (sta) + sta_info_release(local, sta); +} + + +static ieee80211_txrx_result +ieee80211_tx_h_load_stats(struct ieee80211_txrx_data *tx) +{ + struct ieee80211_local *local = tx->local; + struct sk_buff *skb = tx->skb; + struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; + u32 load = 0, hdrtime; + + /* TODO: this could be part of tx_status handling, so that the number + * of retries would be known; TX rate should in that case be stored + * somewhere with the packet */ + + /* Estimate total channel use caused by this frame */ + + /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values, + * 1 usec = 1/8 * (1080 / 10) = 13.5 */ + + if (local->conf.phymode == MODE_IEEE80211A || + local->conf.phymode == MODE_ATHEROS_TURBO || + local->conf.phymode == MODE_ATHEROS_TURBOG || + (local->conf.phymode == MODE_IEEE80211G && + tx->u.tx.rate->flags & IEEE80211_RATE_ERP)) + hdrtime = CHAN_UTIL_HDR_SHORT; + else + hdrtime = CHAN_UTIL_HDR_LONG; + + load = hdrtime; + if (!MULTICAST_ADDR(hdr->addr1)) + load += hdrtime; + + if (tx->u.tx.control->use_rts_cts) + load += 2 * hdrtime; + else if (tx->u.tx.control->use_cts_protect) + load += hdrtime; + + load += skb->len * tx->u.tx.rate->rate_inv; + + if (tx->u.tx.extra_frag) { + int i; + for (i = 0; i < tx->u.tx.num_extra_frag; i++) { + load += 2 * hdrtime; + load += tx->u.tx.extra_frag[i]->len * + tx->u.tx.rate->rate; + } + } + + /* Divide channel_use by 8 to avoid wrapping around the counter */ + load >>= CHAN_UTIL_SHIFT; + local->channel_use_raw += load; + if (tx->sta) + tx->sta->channel_use_raw += load; + tx->sdata->channel_use_raw += load; + + return TXRX_CONTINUE; +} + + +static ieee80211_txrx_result +ieee80211_rx_h_load_stats(struct ieee80211_txrx_data *rx) +{ + struct ieee80211_local *local = rx->local; + struct sk_buff *skb = rx->skb; + struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; + u32 load = 0, hdrtime; + struct ieee80211_rate *rate; + int i; + + /* Estimate total channel use caused by this frame */ + + if (unlikely(local->num_curr_rates < 0)) + return TXRX_CONTINUE; + + rate = &local->curr_rates[0]; + for (i = 0; i < local->num_curr_rates; i++) { + if (local->curr_rates[i].val == rx->u.rx.status->rate) { + rate = &local->curr_rates[i]; + break; + } + } + + /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values, + * 1 usec = 1/8 * (1080 / 10) = 13.5 */ + + if (local->conf.phymode == MODE_IEEE80211A || + local->conf.phymode == MODE_ATHEROS_TURBO || + local->conf.phymode == MODE_ATHEROS_TURBOG || + (local->conf.phymode == MODE_IEEE80211G && + rate->flags & IEEE80211_RATE_ERP)) + hdrtime = CHAN_UTIL_HDR_SHORT; + else + hdrtime = CHAN_UTIL_HDR_LONG; + + load = hdrtime; + if (!MULTICAST_ADDR(hdr->addr1)) + load += hdrtime; + + load += skb->len * rate->rate_inv; + + /* Divide channel_use by 8 to avoid wrapping around the counter */ + load >>= CHAN_UTIL_SHIFT; + local->channel_use_raw += load; + if (rx->sta) + rx->sta->channel_use_raw += load; + rx->sdata->channel_use_raw += load; + + return TXRX_CONTINUE; +} + + +static void ieee80211_stat_refresh(unsigned long data) +{ + struct ieee80211_local *local = (struct ieee80211_local *) data; + struct list_head *ptr, *n; + + if (!local->stat_time) + return; + + /* go through all stations */ + spin_lock_bh(&local->sta_lock); + list_for_each(ptr, &local->sta_list) { + struct sta_info *sta = + list_entry(ptr, struct sta_info, list); + sta->channel_use = (sta->channel_use_raw / local->stat_time) / + CHAN_UTIL_PER_10MS; + sta->channel_use_raw = 0; + } + spin_unlock_bh(&local->sta_lock); + + /* go through all subinterfaces */ + list_for_each_safe(ptr, n, &local->sub_if_list) { + struct ieee80211_sub_if_data *sdata = + list_entry(ptr, struct ieee80211_sub_if_data, list); + sdata->channel_use = (sdata->channel_use_raw / + local->stat_time) / CHAN_UTIL_PER_10MS; + sdata->channel_use_raw = 0; + + } + + /* hardware interface */ + local->channel_use = (local->channel_use_raw / + local->stat_time) / CHAN_UTIL_PER_10MS; + local->channel_use_raw = 0; + + local->stat_timer.expires = jiffies + HZ * local->stat_time / 100; + add_timer(&local->stat_timer); +} + + +/* This is a version of the rx handler that can be called from hard irq + * context. Post the skb on the queue and schedule the tasklet */ +void ieee80211_rx_irqsafe(struct net_device *dev, struct sk_buff *skb, + struct ieee80211_rx_status *status) +{ + struct ieee80211_local *local = dev->priv; + + skb->dev = dev; + memcpy(skb->cb, status, sizeof(struct ieee80211_rx_status)); + skb->pkt_type = ieee80211_rx_msg; + skb_queue_tail(&local->skb_queue, skb); + tasklet_schedule(&local->tasklet); +} + + +void ieee80211_tx_status_irqsafe(struct net_device *dev, struct sk_buff *skb, + struct ieee80211_tx_status *status) +{ + struct ieee80211_local *local = dev->priv; + int tmp; + + if (status->tx_filtered || status->excessive_retries) { + /* Need to save a copy of skb->cb somewhere. Storing it in the + * end of the data might not be the most efficient way of doing + * this (since it may require reallocation of packet data), but + * should be good enough for now since tx_filtered or + * excessive_retries should not be triggered that often. */ + if (skb_is_nonlinear(skb)) { + if (skb_linearize(skb, GFP_ATOMIC)) { + printk(KERN_DEBUG "%s: Failed to linearize " + "skb\n", dev->name); + dev_kfree_skb_irq(skb); + return; + } + } + if (skb_tailroom(skb) < sizeof(skb->cb) && + pskb_expand_head(skb, 0, sizeof(skb->cb), GFP_ATOMIC)) { + printk(KERN_DEBUG "%s: Failed to store skb->cb " + "in skb->data for TX filtered frame\n", + dev->name); + dev_kfree_skb_irq(skb); + return; + } + memcpy(skb_put(skb, sizeof(skb->cb)), skb->cb, + sizeof(skb->cb)); + } + + skb->dev = dev; + memcpy(skb->cb, status, sizeof(struct ieee80211_tx_status)); + skb->pkt_type = ieee80211_tx_status_msg; + skb_queue_tail(status->req_tx_status ? + &local->skb_queue : &local->skb_queue_unreliable, skb); + tmp = skb_queue_len(&local->skb_queue) + + skb_queue_len(&local->skb_queue_unreliable); + while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT && + (skb = skb_dequeue(&local->skb_queue_unreliable))) { + dev_kfree_skb_irq(skb); + tmp--; + I802_DEBUG_INC(local->tx_status_drop); + } + tasklet_schedule(&local->tasklet); +} + + +static void ieee80211_tasklet_handler(unsigned long data) +{ + struct ieee80211_local *local = (struct ieee80211_local *) data; + struct sk_buff *skb; + struct ieee80211_rx_status rx_status; + struct ieee80211_tx_status tx_status; + + while ((skb = skb_dequeue(&local->skb_queue)) || + (skb = skb_dequeue(&local->skb_queue_unreliable))) { + switch (skb->pkt_type) { + case ieee80211_rx_msg: + /* Make a copy of the RX status because the original + * skb may be freed during processing. Clear skb->type + * in order to not confuse kernel netstack. */ + memcpy(&rx_status, skb->cb, sizeof(rx_status)); + skb->pkt_type = 0; + ieee80211_rx(skb->dev, skb, &rx_status); + break; + case ieee80211_tx_status_msg: + /* Make a copy of the TX status because the original + * skb may be freed during processing. */ + memcpy(&tx_status, skb->cb, sizeof(tx_status)); + skb->pkt_type = 0; + if ((tx_status.tx_filtered || + tx_status.excessive_retries) && + skb->len >= sizeof(skb->cb)) { + /* Restore skb->cb from the copy that was made + * in ieee80211_tx_status_irqsafe() */ + memcpy(skb->cb, + skb->data + skb->len - sizeof(skb->cb), + sizeof(skb->cb)); + skb_trim(skb, skb->len - sizeof(skb->cb)); + } + ieee80211_tx_status(skb->dev, skb, &tx_status); + break; + default: /* should never get here! */ + printk(KERN_ERR "%s: Unknown message type (%d)\n", + local->wdev->name, skb->pkt_type); + dev_kfree_skb(skb); + break; + } + } +} + + +/* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to + * make a prepared TX frame (one that has been given to hw) to look like brand + * new IEEE 802.11 frame that is ready to go through TX processing again. */ +static void ieee80211_remove_tx_extra(struct ieee80211_local *local, + struct ieee80211_key *key, + struct sk_buff *skb) +{ + int hdrlen, iv_len, mic_len; + + if (key == NULL) + return; + + hdrlen = ieee80211_get_hdrlen_from_skb(skb); + + switch (key->alg) { + case ALG_WEP: + iv_len = WEP_IV_LEN; + mic_len = WEP_ICV_LEN; + break; + case ALG_TKIP: + iv_len = TKIP_IV_LEN; + mic_len = TKIP_ICV_LEN; + break; + case ALG_CCMP: + iv_len = CCMP_HDR_LEN; + mic_len = CCMP_MIC_LEN; + break; + default: + return; + } + + if (skb->len >= mic_len && key->force_sw_encrypt) + skb_trim(skb, skb->len - mic_len); + if (skb->len >= iv_len && skb->len > hdrlen) { + memmove(skb->data + iv_len, skb->data, hdrlen); + skb_pull(skb, iv_len); + } + + { + struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; + u16 fc = le16_to_cpu(hdr->frame_control); + if ((fc & 0x8C) == 0x88) /* QoS Control Field */ { + fc &= ~(WLAN_FC_STYPE_QOS_DATA << 4); + hdr->frame_control = cpu_to_le16(fc); + memmove(skb->data + 2, skb->data, hdrlen - 2); + skb_pull(skb, 2); + } + } +} + + +void ieee80211_tx_status(struct net_device *dev, struct sk_buff *skb, + struct ieee80211_tx_status *status) +{ + struct sk_buff *skb2; + struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; + struct ieee80211_local *local = dev->priv; + struct ieee80211_tx_packet_data *pkt_data = + (struct ieee80211_tx_packet_data *) skb->cb; + u16 frag, type; + u32 msg_type; + + if (!status) { + printk(KERN_ERR + "%s: ieee80211_tx_status called with NULL status\n", + dev->name); + dev_kfree_skb(skb); + return; + } + + if (status->excessive_retries) { + struct sta_info *sta; + + + sta = sta_info_get(local, hdr->addr1); + if (sta) { + if (sta->flags & WLAN_STA_PS) { + /* The STA is in power save mode, so assume + * that this TX packet failed because of that. + */ + status->excessive_retries = 0; + status->tx_filtered = 1; + } + sta_info_release(local, sta); + } + } + + if (status->tx_filtered) { + struct sta_info *sta; + sta = sta_info_get(local, hdr->addr1); + if (sta) { + + sta->tx_filtered_count++; + + /* Clear the TX filter mask for this STA when sending + * the next packet. If the STA went to power save mode, + * this will happen when it is waking up for the next + * time. */ + sta->clear_dst_mask = 1; + + /* TODO: Is the WLAN_STA_PS flag always set here or is + * the race between RX and TX status causing some + * packets to be filtered out before 80211.o gets an + * update for PS status? This seems to be the case, so + * no changes are likely to be needed. */ + if (sta->flags & WLAN_STA_PS && + skb_queue_len(&sta->tx_filtered) < + STA_MAX_TX_BUFFER) { + ieee80211_remove_tx_extra(local, sta->key, + skb); + skb_queue_tail(&sta->tx_filtered, skb); + } else if (!(sta->flags & WLAN_STA_PS) && + !pkt_data->control.requeue) { + /* Software retry the packet once */ + pkt_data->control.requeue = 1; + ieee80211_remove_tx_extra(local, sta->key, + skb); + dev_queue_xmit(skb); + } else { + if (net_ratelimit()) { + printk(KERN_DEBUG "%s: dropped TX " + "filtered frame queue_len=%d " + "PS=%d @%lu\n", + dev->name, + skb_queue_len( + &sta->tx_filtered), + !!(sta->flags & WLAN_STA_PS), + jiffies); + } + dev_kfree_skb(skb); + } + sta_info_release(local, sta); + return; + } + } else { + rate_control_tx_status(dev, skb, status); + } + +#ifdef IEEE80211_LEDS + if (local->tx_led_counter && (local->tx_led_counter-- == 1)) { + ieee80211_tx_led(0, dev); + } +#endif /* IEEE80211_LEDS */ + /* SNMP counters + * Fragments are passed to low-level drivers as separate skbs, so these + * are actually fragments, not frames. Update frame counters only for + * the first fragment of the frame. */ + + frag = WLAN_GET_SEQ_FRAG(le16_to_cpu(hdr->seq_ctrl)); + type = WLAN_FC_GET_TYPE(le16_to_cpu(hdr->frame_control)); + + if (status->ack) { + if (frag == 0) { + local->dot11TransmittedFrameCount++; + if (MULTICAST_ADDR(hdr->addr1)) + local->dot11MulticastTransmittedFrameCount++; + if (status->retry_count > 0) + local->dot11RetryCount++; + if (status->retry_count > 1) + local->dot11MultipleRetryCount++; + } + + /* This counter shall be incremented for an acknowledged MPDU + * with an individual address in the address 1 field or an MPDU + * with a multicast address in the address 1 field of type Data + * or Management. */ + if (!MULTICAST_ADDR(hdr->addr1) || type == WLAN_FC_TYPE_DATA || + type == WLAN_FC_TYPE_MGMT) + local->dot11TransmittedFragmentCount++; + } else { + if (frag == 0) + local->dot11FailedCount++; + } + + if (!status->req_tx_status) { + dev_kfree_skb(skb); + return; + } + + msg_type = status->ack ? ieee80211_msg_tx_callback_ack : + ieee80211_msg_tx_callback_fail; + + /* skb was the original skb used for TX. Clone it and give the clone + * to netif_rx(). Free original skb. */ + skb2 = skb_copy(skb, GFP_ATOMIC); + if (!skb2) { + dev_kfree_skb(skb); + return; + } + dev_kfree_skb(skb); + skb = skb2; + + /* Send frame to hostapd */ + ieee80211_rx_mgmt(dev, skb, NULL, msg_type); +} + + +/* TODO: implement register/unregister functions for adding TX/RX handlers + * into ordered list */ + +static ieee80211_rx_handler ieee80211_rx_handlers[] = +{ + ieee80211_rx_h_parse_qos, + ieee80211_rx_h_load_stats, + ieee80211_rx_h_monitor, + ieee80211_rx_h_passive_scan, + ieee80211_rx_h_check, + ieee80211_rx_h_sta_process, + ieee80211_rx_h_ccmp_decrypt, + ieee80211_rx_h_tkip_decrypt, + ieee80211_rx_h_wep_weak_iv_detection, + ieee80211_rx_h_wep_decrypt, + ieee80211_rx_h_defragment, + ieee80211_rx_h_ieee80211_rx_h_ps_poll, + ieee80211_rx_h_michael_mic_verify, + /* this must be after decryption - so header is counted in MPDU mic + * must be before pae and data, so QOS_DATA format frames + * are not passed to user space by these functions + */ + ieee80211_rx_h_remove_qos_control, + ieee80211_rx_h_802_1x_pae, + ieee80211_rx_h_drop_unencrypted, + ieee80211_rx_h_data, + ieee80211_rx_h_mgmt, + NULL +}; + +static ieee80211_tx_handler ieee80211_tx_handlers[] = +{ + ieee80211_tx_h_rate_limit, + ieee80211_tx_h_check_assoc, + ieee80211_tx_h_ps_buf, + ieee80211_tx_h_select_key, + ieee80211_tx_h_michael_mic_add, + ieee80211_tx_h_fragment, + ieee80211_tx_h_tkip_encrypt, + ieee80211_tx_h_ccmp_encrypt, + ieee80211_tx_h_wep_encrypt, + ieee80211_tx_h_rate_ctrl, + ieee80211_tx_h_misc, + ieee80211_tx_h_load_stats, + NULL +}; + + +static void ieee80211_if_sdata_init(struct ieee80211_sub_if_data *sdata) +{ + /* Default values for sub-interface parameters */ + sdata->drop_unencrypted = 0; + sdata->eapol = 1; +} + + +static struct net_device *ieee80211_if_add(struct net_device *dev, + char *name, int locked) +{ + struct net_device *wds_dev = NULL, *tmp_dev; + struct ieee80211_local *local = dev->priv; + struct ieee80211_sub_if_data *sdata = NULL, *sdata_parent; + int alloc_size; + int ret; + int i; + + /* ensure 32-bit alignment of our private data and hw private data */ + alloc_size = sizeof(struct net_device) + 3 + + sizeof(struct ieee80211_sub_if_data) + 3; + + wds_dev = (struct net_device *) kmalloc(alloc_size, GFP_KERNEL); + if (wds_dev == NULL) + return NULL; + + memset(wds_dev, 0, alloc_size); + wds_dev->priv = local; + ether_setup(wds_dev); + if (strlen(name) == 0) { + i = 0; + do { + sprintf(wds_dev->name, "%s.%d", dev->name, i++); + tmp_dev = dev_get_by_name(wds_dev->name); + if (tmp_dev == NULL) + break; + dev_put(tmp_dev); + } while (i < 10000); + } else { + snprintf(wds_dev->name, IFNAMSIZ, "%s", name); + } + + memcpy(wds_dev->dev_addr, dev->dev_addr, ETH_ALEN); + wds_dev->hard_start_xmit = ieee80211_subif_start_xmit; + wds_dev->do_ioctl = ieee80211_ioctl; + wds_dev->change_mtu = ieee80211_change_mtu; + wds_dev->tx_timeout = ieee80211_tx_timeout; + wds_dev->get_stats = ieee80211_get_stats; + wds_dev->open = ieee80211_open; + wds_dev->stop = ieee80211_stop; + wds_dev->base_addr = dev->base_addr; + wds_dev->irq = dev->irq; + wds_dev->mem_start = dev->mem_start; + wds_dev->mem_end = dev->mem_end; + wds_dev->tx_queue_len = 0; + + sdata = IEEE80211_DEV_TO_SUB_IF(wds_dev); + sdata->type = IEEE80211_SUB_IF_TYPE_NORM; + sdata->master = local->mdev; + sdata->dev = wds_dev; + sdata->local = local; + memset(&sdata->stats, 0, sizeof(struct net_device_stats)); + sdata_parent = IEEE80211_DEV_TO_SUB_IF(dev); + if (sdata_parent->type == IEEE80211_SUB_IF_TYPE_NORM) + sdata->bss = &sdata_parent->u.norm; + else { + printk(KERN_DEBUG "%s: could not set BSS pointer for new " + "interface %s\n", dev->name, wds_dev->name); + } + ieee80211_if_sdata_init(sdata); + + if (locked) + ret = register_netdevice(wds_dev); + else + ret = register_netdev(wds_dev); + if (ret) { + kfree(wds_dev); + return NULL; + } + + list_add(&sdata->list, &local->sub_if_list); + + strcpy(name, wds_dev->name); + + return wds_dev; +} + + +int ieee80211_if_add_wds(struct net_device *dev, char *name, + struct ieee80211_if_wds *wds, int locked) +{ + struct net_device *wds_dev = NULL; + struct ieee80211_sub_if_data *sdata = NULL; + + if (strlen(name) != 0) { + wds_dev = dev_get_by_name(name); + if (wds_dev) { + dev_put(wds_dev); + return -EEXIST; + } + } + + wds_dev = ieee80211_if_add(dev, name, locked); + if (wds_dev == NULL) + return -ENOANO; + + sdata = IEEE80211_DEV_TO_SUB_IF(wds_dev); + sdata->type = IEEE80211_SUB_IF_TYPE_WDS; + memcpy(&sdata->u.wds, wds, sizeof(struct ieee80211_if_wds)); + +#ifdef CONFIG_IEEE80211_VERBOSE_DEBUG + printk(KERN_DEBUG + "%s: Added WDS Link to " MACSTR "\n", + wds_dev->name, MAC2STR(sdata->u.wds.remote_addr)); +#endif /* CONFIG_IEEE80211_VERBOSE_DEBUG */ + + + ieee80211_proc_init_virtual(wds_dev); + + return 0; +} + + +int ieee80211_if_update_wds(struct net_device *dev, char *name, + struct ieee80211_if_wds *wds, int locked) +{ + struct net_device *wds_dev = NULL; + struct ieee80211_local *local = dev->priv; + struct ieee80211_sub_if_data *sdata = NULL; + struct sta_info *sta; + struct list_head *ptr; + + list_for_each(ptr, &local->sub_if_list) { + sdata = list_entry(ptr, struct ieee80211_sub_if_data, list); + if (strcmp(name, sdata->dev->name) == 0) { + wds_dev = sdata->dev; + break; + } + } + + if (wds_dev == NULL || sdata->type != IEEE80211_SUB_IF_TYPE_WDS) + return -ENODEV; + + /* Remove STA entry for the old peer */ + sta = sta_info_get(local, sdata->u.wds.remote_addr); + if (sta) { + sta_info_release(local, sta); + sta_info_free(local, sta, 0); + } else { + printk(KERN_DEBUG "%s: could not find STA entry for WDS link " + "%s peer " MACSTR "\n", + dev->name, wds_dev->name, + MAC2STR(sdata->u.wds.remote_addr)); + } + + /* Update WDS link data */ + memcpy(&sdata->u.wds, wds, sizeof(struct ieee80211_if_wds)); + + + return 0; +} + + +static void ieee80211_if_init(struct net_device *dev) +{ + struct ieee80211_local *local = dev->priv; + + spin_lock_init(&local->sub_if_lock); + INIT_LIST_HEAD(&local->sub_if_list); + +} + + +int ieee80211_if_add_vlan(struct net_device *dev, + char *name, + struct ieee80211_if_vlan *vlan, + int locked) +{ + struct net_device *vlan_dev = NULL; + struct ieee80211_sub_if_data *sdata = NULL; + + if (strlen(name) != 0) { + vlan_dev = dev_get_by_name(name); + if (vlan_dev) { + dev_put(vlan_dev); + return -EEXIST; + } + } + + vlan_dev = ieee80211_if_add(dev, name, locked); + if (vlan_dev == NULL) + return -ENOANO; + + sdata = IEEE80211_DEV_TO_SUB_IF(vlan_dev); + sdata->type = IEEE80211_SUB_IF_TYPE_VLAN; + ieee80211_proc_init_virtual(vlan_dev); + return 0; +} + + +static void ieee80211_if_norm_init(struct ieee80211_sub_if_data *sdata) +{ + sdata->type = IEEE80211_SUB_IF_TYPE_NORM; + sdata->u.norm.dtim_period = 2; + sdata->u.norm.force_unicast_rateidx = -1; + sdata->u.norm.max_ratectrl_rateidx = -1; + skb_queue_head_init(&sdata->u.norm.ps_bc_buf); + sdata->bss = &sdata->u.norm; +} + + +int ieee80211_if_add_norm(struct net_device *dev, char *name, u8 *bssid, + int locked) +{ + struct ieee80211_local *local = dev->priv; + struct net_device *norm_dev = NULL; + struct ieee80211_sub_if_data *sdata = NULL; + + if (local->bss_dev_count >= local->conf.bss_count) + return -ENOBUFS; + + if (strlen(name) != 0) { + norm_dev = dev_get_by_name(name); + if (norm_dev) { + dev_put(norm_dev); + return -EEXIST; + } + } + + norm_dev = ieee80211_if_add(dev, name, locked); + if (norm_dev == NULL) + return -ENOANO; + + memcpy(norm_dev->dev_addr, bssid, ETH_ALEN); + sdata = IEEE80211_DEV_TO_SUB_IF(norm_dev); + ieee80211_if_norm_init(sdata); + ieee80211_proc_init_virtual(norm_dev); + spin_lock_bh(&local->sub_if_lock); + local->bss_devs[local->bss_dev_count] = norm_dev; + local->bss_dev_count++; + spin_unlock_bh(&local->sub_if_lock); + + return 0; +} + + +static void ieee80211_addr_inc(u8 *addr) +{ + int pos = 5; + while (pos >= 0) { + addr[pos]++; + if (addr[pos] != 0) + break; + pos--; + } +} + + +int ieee80211_if_add_sta(struct net_device *dev, char *name, int locked) +{ + struct ieee80211_local *local = dev->priv; + struct net_device *sta_dev; + struct ieee80211_sub_if_data *sdata; + struct ieee80211_if_sta *ifsta; + int i; + + if (local->sta_dev_count >= local->conf.bss_count) + return -ENOBUFS; + + if (strlen(name) != 0) { + sta_dev = dev_get_by_name(name); + if (sta_dev) { + dev_put(sta_dev); + return -EEXIST; + } + } + + sta_dev = ieee80211_if_add(dev, name, locked); + if (sta_dev == NULL) + return -ENOANO; + + sdata = IEEE80211_DEV_TO_SUB_IF(sta_dev); + ifsta = &sdata->u.sta; + sdata->type = IEEE80211_SUB_IF_TYPE_STA; + ieee80211_proc_init_virtual(sta_dev); + + spin_lock_bh(&local->sub_if_lock); + for (i = 0; i < local->conf.bss_count; i++) { + if (local->sta_devs[i] == NULL) { + local->sta_devs[i] = sta_dev; + local->sta_dev_count++; + printk(KERN_DEBUG "%s: using STA entry %d\n", + sta_dev->name, i); + while (i > 0) { + ieee80211_addr_inc(sta_dev->dev_addr); + i--; + } + printk(KERN_DEBUG "%s: MAC address " MACSTR "\n", + sta_dev->name, MAC2STR(sta_dev->dev_addr)); + break; + } + } + spin_unlock_bh(&local->sub_if_lock); + + init_timer(&ifsta->timer); + ifsta->timer.data = (unsigned long) sta_dev; + ifsta->timer.function = ieee80211_sta_timer; + + ifsta->capab = WLAN_CAPABILITY_ESS; + ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN | + IEEE80211_AUTH_ALG_SHARED_KEY; + ifsta->create_ibss = 1; + ifsta->wmm_enabled = 1; + + return 0; +} + + +static void ieee80211_if_del(struct ieee80211_local *local, + struct ieee80211_sub_if_data *sdata, int locked) +{ + struct sta_info *sta; + u8 addr[ETH_ALEN]; + int i, j; + struct list_head *ptr, *n; + + memset(addr, 0xff, ETH_ALEN); + for (i = 0; i < NUM_DEFAULT_KEYS; i++) { + if (!sdata->keys[i]) + continue; +#if 0 + /* Low-level driver has probably disabled hw + * already, so there is not really much point + * in disabling the keys at this point. */ + if (local->hw->set_key) + local->hw->set_key(dev, DISABLE_KEY, addr, + local->keys[i], 0); +#endif + kfree(sdata->keys[i]); + } + + switch (sdata->type) { + case IEEE80211_SUB_IF_TYPE_NORM: + /* Remove all virtual interfaces that use this BSS + * as their sdata->bss */ + list_for_each_safe(ptr, n, &local->sub_if_list) { + struct ieee80211_sub_if_data *tsdata = + list_entry(ptr, struct ieee80211_sub_if_data, + list); + + if (tsdata != sdata && tsdata->bss == &sdata->u.norm) { + printk(KERN_DEBUG "%s: removing virtual " + "interface %s because its BSS interface" + " is being removed\n", + sdata->dev->name, tsdata->dev->name); + ieee80211_if_del(local, tsdata, locked); + } + } + + kfree(sdata->u.norm.beacon_head); + kfree(sdata->u.norm.beacon_tail); + spin_lock_bh(&local->sub_if_lock); + for (j = 0; j < local->bss_dev_count; j++) { + if (sdata->dev == local->bss_devs[j]) { + if (j + 1 < local->bss_dev_count) { + memcpy(&local->bss_devs[j], + &local->bss_devs[j + 1], + (local->bss_dev_count - j - 1) * + sizeof(local->bss_devs[0])); + local->bss_devs[local->bss_dev_count - + 1] = NULL; + } else + local->bss_devs[j] = NULL; + local->bss_dev_count--; + break; + } + } + spin_unlock_bh(&local->sub_if_lock); + + if (sdata->dev != local->mdev) { + struct sk_buff *skb; + while ((skb = skb_dequeue(&sdata->u.norm.ps_bc_buf))) { + local->total_ps_buffered--; + dev_kfree_skb(skb); + } + } + + break; + case IEEE80211_SUB_IF_TYPE_WDS: + sta = sta_info_get(local, sdata->u.wds.remote_addr); + if (sta) { + sta_info_release(local, sta); + sta_info_free(local, sta, 0); + } else { +#ifdef CONFIG_IEEE80211_VERBOSE_DEBUG + printk(KERN_DEBUG "%s: Someone had deleted my STA " + "entry for the WDS link\n", sdata->dev->name); +#endif /* CONFIG_IEEE80211_VERBOSE_DEBUG */ + } + break; + case IEEE80211_SUB_IF_TYPE_STA: + del_timer_sync(&sdata->u.sta.timer); + if (local->scan_timer.data == (unsigned long) sdata->dev) + del_timer_sync(&local->scan_timer); + kfree(sdata->u.sta.extra_ie); + sdata->u.sta.extra_ie = NULL; + kfree(sdata->u.sta.assocreq_ies); + sdata->u.sta.assocreq_ies = NULL; + kfree(sdata->u.sta.assocresp_ies); + sdata->u.sta.assocresp_ies = NULL; + if (sdata->u.sta.probe_resp) { + dev_kfree_skb(sdata->u.sta.probe_resp); + sdata->u.sta.probe_resp = NULL; + } + for (i = 0; i < local->conf.bss_count; i++) { + if (local->sta_devs[i] == sdata->dev) { + local->sta_devs[i] = NULL; + local->sta_dev_count--; + break; + } + } + + break; + } + + /* remove all STAs that are bound to this virtual interface */ + sta_info_flush(local, sdata->dev); + + list_del(&sdata->list); + ieee80211_proc_deinit_virtual(sdata->dev); + if (locked) + unregister_netdevice(sdata->dev); + else + unregister_netdev(sdata->dev); + /* Default data device and management device are allocated with the + * master device. All other devices are separately allocated and will + * be freed here. */ + if (sdata->dev != local->mdev && sdata->dev != local->wdev && + sdata->dev != local->apdev) + kfree(sdata->dev); +} + + +static int ieee80211_if_remove(struct net_device *dev, char *name, int id, + int locked) +{ + struct ieee80211_local *local = dev->priv; + struct list_head *ptr, *n; + + /* Make sure not to touch sdata->master since it may + * have already been deleted, etc. */ + + list_for_each_safe(ptr, n, &local->sub_if_list) { + struct ieee80211_sub_if_data *sdata = + list_entry(ptr, struct ieee80211_sub_if_data, list); + + if (sdata->type == id && strcmp(name, sdata->dev->name) == 0) { + ieee80211_if_del(local, sdata, locked); + break; + } + } + + return 0; +} + + +int ieee80211_if_remove_wds(struct net_device *dev, char *name, int locked) +{ + return ieee80211_if_remove(dev, name, IEEE80211_SUB_IF_TYPE_WDS, + locked); +} + + +int ieee80211_if_remove_vlan(struct net_device *dev, char *name, int locked) +{ + return ieee80211_if_remove(dev, name, IEEE80211_SUB_IF_TYPE_VLAN, + locked); +} + + +int ieee80211_if_remove_norm(struct net_device *dev, char *name, int locked) +{ + return ieee80211_if_remove(dev, name, IEEE80211_SUB_IF_TYPE_NORM, + locked); +} + + +int ieee80211_if_remove_sta(struct net_device *dev, char *name, int locked) +{ + return ieee80211_if_remove(dev, name, IEEE80211_SUB_IF_TYPE_STA, + locked); +} + + +int ieee80211_if_flush(struct net_device *dev, int locked) +{ + struct ieee80211_local *local = dev->priv; + struct list_head *ptr, *n; + + list_for_each_safe(ptr, n, &local->sub_if_list) { + struct ieee80211_sub_if_data *sdata = + list_entry(ptr, struct ieee80211_sub_if_data, list); + + if (sdata->dev != local->mdev && + sdata->dev != local->wdev && + sdata->dev != local->apdev) + ieee80211_if_del(local, sdata, locked); + } + + return 0; +} + + +static void ieee80211_precalc_rates(struct ieee80211_hw *hw) +{ + struct ieee80211_hw_modes *mode; + struct ieee80211_rate *rate; + int m, r; + + for (m = 0; m < hw->num_modes; m++) { + mode = &hw->modes[m]; + for (r = 0; r < mode->num_rates; r++) { + rate = &mode->rates[r]; + rate->rate_inv = CHAN_UTIL_RATE_LCM / rate->rate; + } + } +} + + +struct net_device *ieee80211_alloc_hw(size_t priv_data_len, + void (*setup)(struct net_device *)) +{ + struct net_device *dev, *apdev, *mdev; + struct ieee80211_local *local; + struct ieee80211_sub_if_data *sdata; + int alloc_size; + + /* Ensure 32-bit alignment of our private data and hw private data. + * Each net_device is followed by a sub_if_data which which is used + * for wds/vlan information; it is aligned as well. + * + * Sample memory map looks something like: + * + * 0000 ***************** + * * net_dev * + * 015c ***************** + * * sub_if * + * 017c ***************** + * * local * + * 0b84 ***************** + * * hw_priv * + * 1664 ***************** + * * ap net_dev * + * 17c0 ***************** + * * sub_if * + * ***************** + * * master net_dev* + * ***************** + * * sub_if * + * ***************** + */ + alloc_size = sizeof(struct net_device) + + sizeof(struct ieee80211_sub_if_data) + 3 + + sizeof(struct ieee80211_local) + 3 + + priv_data_len + 3 + + sizeof(struct net_device) + 3 + + sizeof(struct ieee80211_sub_if_data) + 3 + + sizeof(struct net_device) + 3 + + sizeof(struct ieee80211_sub_if_data) + 3 + + 4096; + mdev = (struct net_device *) kzalloc(alloc_size, GFP_KERNEL); + if (mdev == NULL) + return NULL; + + mdev->priv = (struct net_device *) + (((long) mdev + + sizeof(struct net_device) + + sizeof(struct ieee80211_sub_if_data) + 3) + & ~3); + local = mdev->priv; + local->hw_priv = (void *) + (((long) local + sizeof(struct ieee80211_local) + 3) & ~3); + apdev = (struct net_device *) + (((long) local->hw_priv + priv_data_len + 3) & ~3); + dev = (struct net_device *) + (((long) apdev + + sizeof(struct net_device) + + sizeof(struct ieee80211_sub_if_data) + 3) + & ~3); + dev->priv = local; + + ether_setup(dev); + memcpy(dev->name, "wlan%d", 7); + + dev->hard_start_xmit = ieee80211_subif_start_xmit; + dev->do_ioctl = ieee80211_ioctl; + dev->change_mtu = ieee80211_change_mtu; + dev->tx_timeout = ieee80211_tx_timeout; + dev->get_stats = ieee80211_get_stats; + dev->open = ieee80211_open; + dev->stop = ieee80211_stop; + dev->tx_queue_len = 0; + dev->set_mac_address = ieee80211_set_mac_address; + + local->wdev = dev; + local->mdev = mdev; + local->rx_handlers = ieee80211_rx_handlers; + local->tx_handlers = ieee80211_tx_handlers; + + local->bridge_packets = 1; + + local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD; + local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD; + local->short_retry_limit = 7; + local->long_retry_limit = 4; + local->conf.calib_int = 60; + local->rate_ctrl_num_up = RATE_CONTROL_NUM_UP; + local->rate_ctrl_num_down = RATE_CONTROL_NUM_DOWN; + local->conf.bss_count = 1; + memset(local->conf.bssid_mask, 0xff, ETH_ALEN); + local->bss_devs = kmalloc(sizeof(struct net_device *), GFP_KERNEL); + if (local->bss_devs == NULL) + goto fail; + local->bss_devs[0] = local->wdev; + local->bss_dev_count = 1; + local->sta_devs = kmalloc(sizeof(struct net_device *), GFP_KERNEL); + if (local->sta_devs == NULL) + goto fail; + local->sta_devs[0] = NULL; + + local->scan.in_scan = 0; + local->hw_modes = (unsigned int) -1; + + init_timer(&local->scan.timer); /* clear it out */ + + spin_lock_init(&local->generic_lock); + init_timer(&local->rate_limit_timer); + local->rate_limit_timer.function = ieee80211_rate_limit; + local->rate_limit_timer.data = (unsigned long) local; + init_timer(&local->stat_timer); + local->stat_timer.function = ieee80211_stat_refresh; + local->stat_timer.data = (unsigned long) local; + ieee80211_rx_bss_list_init(dev); + + sta_info_init(local); + + ieee80211_if_init(dev); + + sdata = IEEE80211_DEV_TO_SUB_IF(dev); + sdata->dev = dev; + sdata->master = mdev; + sdata->local = local; + ieee80211_if_sdata_init(sdata); + ieee80211_if_norm_init(sdata); + list_add_tail(&sdata->list, &local->sub_if_list); + + if (strlen(dev->name) + 2 >= sizeof(dev->name)) + goto fail; + + apdev = (struct net_device *) + (((long) local->hw_priv + priv_data_len + 3) & ~3); + local->apdev = apdev; + ether_setup(apdev); + apdev->priv = local; + apdev->hard_start_xmit = ieee80211_mgmt_start_xmit; + apdev->change_mtu = ieee80211_change_mtu_apdev; + apdev->get_stats = ieee80211_get_stats; + apdev->open = ieee80211_open; + apdev->stop = ieee80211_stop; + apdev->type = ARPHRD_IEEE80211_PRISM; + apdev->hard_header_parse = header_parse_80211; + apdev->tx_queue_len = 0; + sprintf(apdev->name, "%sap", dev->name); + + sdata = IEEE80211_DEV_TO_SUB_IF(apdev); + sdata->type = IEEE80211_SUB_IF_TYPE_MGMT; + sdata->dev = apdev; + sdata->master = mdev; + sdata->local = local; + list_add_tail(&sdata->list, &local->sub_if_list); + + ether_setup(mdev); + mdev->hard_start_xmit = ieee80211_master_start_xmit; + mdev->do_ioctl = ieee80211_ioctl; + mdev->change_mtu = ieee80211_change_mtu; + mdev->tx_timeout = ieee80211_tx_timeout; + mdev->get_stats = ieee80211_get_stats; + mdev->open = ieee80211_open; + mdev->stop = ieee80211_stop; + mdev->type = ARPHRD_IEEE80211; + mdev->hard_header_parse = header_parse_80211; + sprintf(mdev->name, "%s.11", dev->name); + + sdata = IEEE80211_DEV_TO_SUB_IF(mdev); + sdata->type = IEEE80211_SUB_IF_TYPE_NORM; + sdata->dev = mdev; + sdata->master = mdev; + sdata->local = local; + list_add_tail(&sdata->list, &local->sub_if_list); + + tasklet_init(&local->tasklet, + ieee80211_tasklet_handler, + (unsigned long) local); + skb_queue_head_init(&local->skb_queue); + skb_queue_head_init(&local->skb_queue_unreliable); + + if (setup) + setup(mdev); + + return mdev; + + fail: + ieee80211_free_hw(mdev); + return NULL; +} + +int ieee80211_register_hw(struct net_device *dev, struct ieee80211_hw *hw) +{ + struct ieee80211_local *local = dev->priv; + int result; + + if (!hw) + return -1; + + if (hw->version != IEEE80211_VERSION) { + printk("ieee80211_register_hw - version mismatch: 80211.o " + "version %d, low-level driver version %d\n", + IEEE80211_VERSION, hw->version); + return -1; + } + + local->conf.mode = IW_MODE_MASTER; + local->conf.beacon_int = 1000; + + ieee80211_update_hw(dev, hw); /* Don't care about the result. */ + + sta_info_start(local); + + result = register_netdev(local->wdev); + if (result < 0) + return -1; + + result = register_netdev(local->apdev); + if (result < 0) + goto fail_2nd_dev; + + if (hw->fraglist) + dev->features |= NETIF_F_FRAGLIST; + result = register_netdev(dev); + if (result < 0) + goto fail_3rd_dev; + + if (rate_control_initialize(local) < 0) { + printk(KERN_DEBUG "%s: Failed to initialize rate control " + "algorithm\n", dev->name); + goto fail_rate; + } + + /* TODO: add rtnl locking around device creation and qdisc install */ + ieee80211_install_qdisc(dev); + + ieee80211_wep_init(local); + ieee80211_proc_init_interface(local); + return 0; + +fail_rate: + unregister_netdev(dev); +fail_3rd_dev: + unregister_netdev(local->apdev); +fail_2nd_dev: + unregister_netdev(local->wdev); + sta_info_stop(local); + return result; +} + +int ieee80211_update_hw(struct net_device *dev, struct ieee80211_hw *hw) +{ + struct ieee80211_local *local = dev->priv; + + local->hw = hw; + + /* Backwards compatibility for low-level drivers that do not set number + * of TX queues. */ + if (hw->queues == 0) + hw->queues = 1; + + memcpy(local->apdev->dev_addr, dev->dev_addr, ETH_ALEN); + local->apdev->base_addr = dev->base_addr; + local->apdev->irq = dev->irq; + local->apdev->mem_start = dev->mem_start; + local->apdev->mem_end = dev->mem_end; + + memcpy(local->wdev->dev_addr, dev->dev_addr, ETH_ALEN); + local->wdev->base_addr = dev->base_addr; + local->wdev->irq = dev->irq; + local->wdev->mem_start = dev->mem_start; + local->wdev->mem_end = dev->mem_end; + + if (!hw->modes || !hw->modes->channels || !hw->modes->rates || + !hw->modes->num_channels || !hw->modes->num_rates) + return -1; + + ieee80211_precalc_rates(hw); + local->conf.phymode = hw->modes[0].mode; + local->curr_rates = hw->modes[0].rates; + local->num_curr_rates = hw->modes[0].num_rates; + ieee80211_prepare_rates(dev); + + local->conf.freq = local->hw->modes[0].channels[0].freq; + local->conf.channel = local->hw->modes[0].channels[0].chan; + local->conf.channel_val = local->hw->modes[0].channels[0].val; + /* FIXME: Invoke config to allow driver to set the channel. */ + + return 0; +} + +void ieee80211_unregister_hw(struct net_device *dev) +{ + struct ieee80211_local *local = dev->priv; + struct list_head *ptr, *n; + int i; + + tasklet_disable(&local->tasklet); + /* TODO: skb_queue should be empty here, no need to do anything? */ + + if (local->rate_limit) + del_timer_sync(&local->rate_limit_timer); + if (local->stat_time) + del_timer_sync(&local->stat_timer); + if (local->scan_timer.data) + del_timer_sync(&local->scan_timer); + ieee80211_rx_bss_list_deinit(dev); + + list_for_each_safe(ptr, n, &local->sub_if_list) { + struct ieee80211_sub_if_data *sdata = + list_entry(ptr, struct ieee80211_sub_if_data, list); + ieee80211_if_del(local, sdata, 0); + } + + sta_info_stop(local); + + for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) + if (local->fragments[i].skb) + dev_kfree_skb(local->fragments[i].skb); + + for (i = 0; i < NUM_IEEE80211_MODES; i++) { + kfree(local->supp_rates[i]); + kfree(local->basic_rates[i]); + } + + kfree(local->conf.ssid); + kfree(local->conf.generic_elem); + + ieee80211_proc_deinit_interface(local); + + skb_queue_purge(&local->skb_queue); + skb_queue_purge(&local->skb_queue_unreliable); + + rate_control_free(local); +} + +void ieee80211_free_hw(struct net_device *dev) +{ + struct ieee80211_local *local = dev->priv; + + kfree(local->sta_devs); + kfree(local->bss_devs); + kfree(dev); +} + +/* Perform netif operations on all configured interfaces */ +int ieee80211_netif_oper(struct net_device *sdev, Netif_Oper op) +{ + struct ieee80211_local *local = sdev->priv; + struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(sdev); + struct net_device *dev = sdata->master; + + switch (op) { + case NETIF_ATTACH: + netif_device_attach(dev); + break; + case NETIF_DETACH: + netif_device_detach(dev); + break; + case NETIF_START: + netif_start_queue(dev); + break; + case NETIF_STOP: + break; + case NETIF_WAKE: + if (local->scan.in_scan == 0) { + netif_wake_queue(dev); +#if 1 + if (/* FIX: 802.11 qdisc in use */ 1) + __netif_schedule(dev); +#endif + } + break; + case NETIF_IS_STOPPED: + if (netif_queue_stopped(dev)) + return 1; + break; + case NETIF_UPDATE_TX_START: + dev->trans_start = jiffies; + break; + } + + return 0; +} + + +void * ieee80211_dev_hw_data(struct net_device *dev) +{ + struct ieee80211_local *local = dev->priv; + return local->hw_priv; +} + + +void * ieee80211_dev_stats(struct net_device *dev) +{ + struct ieee80211_sub_if_data *sdata; + sdata = IEEE80211_DEV_TO_SUB_IF(dev); + return &(sdata->stats); +} + + +int ieee80211_rate_control_register(struct rate_control_ops *ops) +{ + struct rate_control_algs *alg; + + alg = kmalloc(sizeof(*alg), GFP_KERNEL); + if (alg == NULL) { + return -1; + } + memset(alg, 0, sizeof(*alg)); + alg->next = ieee80211_rate_ctrl_algs; + alg->ops = ops; + ieee80211_rate_ctrl_algs = alg; + + return 0; +} + + +void ieee80211_rate_control_unregister(struct rate_control_ops *ops) +{ + struct rate_control_algs *alg, *prev; + + prev = NULL; + alg = ieee80211_rate_ctrl_algs; + while (alg) { + if (alg->ops == ops) { + if (prev) + prev->next = alg->next; + else + ieee80211_rate_ctrl_algs = alg->next; + kfree(alg); + break; + } + prev = alg; + alg = alg->next; + } +} + + +static int rate_control_initialize(struct ieee80211_local *local) +{ + struct rate_control_algs *algs; + for (algs = ieee80211_rate_ctrl_algs; algs; algs = algs->next) { + local->rate_ctrl = algs->ops; + local->rate_ctrl_priv = rate_control_alloc(local); + if (local->rate_ctrl_priv) { + printk(KERN_DEBUG "%s: Selected rate control " + "algorithm '%s'\n", local->wdev->name, + local->rate_ctrl->name); + return 0; + } + } + + printk(KERN_WARNING "%s: Failed to select rate control algorithm\n", + local->wdev->name); + return -1; +} + + +static int __init ieee80211_init(void) +{ + struct sk_buff *skb; + if (sizeof(struct ieee80211_tx_packet_data) > (sizeof(skb->cb))) { + printk("80211: ieee80211_tx_packet_data is bigger " + "than the skb->cb (%d > %d)\n", + (int) sizeof(struct ieee80211_tx_packet_data), + (int) sizeof(skb->cb)); + return -EINVAL; + } + if (sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)) { + printk("80211: ieee80211_rx_status is bigger " + "than the skb->cb (%d > %d)\n", + (int) sizeof(struct ieee80211_rx_status), + (int) sizeof(skb->cb)); + return -EINVAL; + } + + ieee80211_proc_init(); + { + int ret = ieee80211_wme_register(); + if (ret) { + printk(KERN_DEBUG "ieee80211_init: failed to " + "initialize WME (err=%d)\n", ret); + ieee80211_proc_deinit(); + return ret; + } + } + + return 0; +} + + +static void __exit ieee80211_exit(void) +{ + ieee80211_wme_unregister(); + ieee80211_proc_deinit(); +} + + +EXPORT_SYMBOL(ieee80211_alloc_hw); +EXPORT_SYMBOL(ieee80211_register_hw); +EXPORT_SYMBOL(ieee80211_update_hw); +EXPORT_SYMBOL(ieee80211_unregister_hw); +EXPORT_SYMBOL(ieee80211_free_hw); +EXPORT_SYMBOL(ieee80211_rx); +EXPORT_SYMBOL(ieee80211_tx_status); +EXPORT_SYMBOL(ieee80211_beacon_get); +EXPORT_SYMBOL(ieee80211_get_buffered_bc); +EXPORT_SYMBOL(ieee80211_netif_oper); +EXPORT_SYMBOL(ieee80211_dev_hw_data); +EXPORT_SYMBOL(ieee80211_dev_stats); +EXPORT_SYMBOL(ieee80211_get_hw_conf); +EXPORT_SYMBOL(ieee80211_set_aid_for_sta); +EXPORT_SYMBOL(ieee80211_rx_irqsafe); +EXPORT_SYMBOL(ieee80211_tx_status_irqsafe); +EXPORT_SYMBOL(ieee80211_get_hdrlen); +EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb); +EXPORT_SYMBOL(ieee80211_rate_control_register); +EXPORT_SYMBOL(ieee80211_rate_control_unregister); +EXPORT_SYMBOL(sta_info_get); +EXPORT_SYMBOL(sta_info_release); +EXPORT_SYMBOL(ieee80211_radar_status); + +module_init(ieee80211_init); +module_exit(ieee80211_exit); |