![Ivo van Doorn](/assets/img/avatar_default.png)
Before calling update_beacon() mac80211 must initialize the control.vif pointer so it can be used by the driver to determine which interface is trying to send the beacon. v2: ieee80211_beacon_get() should also initialize the vif pointer since it can be called by mac80211 internally before calling config_interface(). Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com> Acked-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
1890 lines
53 KiB
C
1890 lines
53 KiB
C
/*
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* Copyright 2002-2005, Instant802 Networks, Inc.
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* Copyright 2005-2006, Devicescape Software, Inc.
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* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
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* Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*
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* Transmit and frame generation functions.
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/skbuff.h>
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#include <linux/etherdevice.h>
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#include <linux/bitmap.h>
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#include <linux/rcupdate.h>
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#include <net/net_namespace.h>
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#include <net/ieee80211_radiotap.h>
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#include <net/cfg80211.h>
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#include <net/mac80211.h>
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#include <asm/unaligned.h>
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#include "ieee80211_i.h"
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#include "ieee80211_led.h"
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#include "wep.h"
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#include "wpa.h"
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#include "wme.h"
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#include "ieee80211_rate.h"
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#define IEEE80211_TX_OK 0
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#define IEEE80211_TX_AGAIN 1
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#define IEEE80211_TX_FRAG_AGAIN 2
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/* misc utils */
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static inline void ieee80211_include_sequence(struct ieee80211_sub_if_data *sdata,
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struct ieee80211_hdr *hdr)
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{
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/* Set the sequence number for this frame. */
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hdr->seq_ctrl = cpu_to_le16(sdata->sequence);
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/* Increase the sequence number. */
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sdata->sequence = (sdata->sequence + 0x10) & IEEE80211_SCTL_SEQ;
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}
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#ifdef CONFIG_MAC80211_LOWTX_FRAME_DUMP
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static void ieee80211_dump_frame(const char *ifname, const char *title,
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const struct sk_buff *skb)
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{
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const struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
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u16 fc;
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int hdrlen;
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DECLARE_MAC_BUF(mac);
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printk(KERN_DEBUG "%s: %s (len=%d)", ifname, title, skb->len);
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if (skb->len < 4) {
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printk("\n");
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return;
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}
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fc = le16_to_cpu(hdr->frame_control);
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hdrlen = ieee80211_get_hdrlen(fc);
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if (hdrlen > skb->len)
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hdrlen = skb->len;
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if (hdrlen >= 4)
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printk(" FC=0x%04x DUR=0x%04x",
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fc, le16_to_cpu(hdr->duration_id));
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if (hdrlen >= 10)
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printk(" A1=%s", print_mac(mac, hdr->addr1));
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if (hdrlen >= 16)
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printk(" A2=%s", print_mac(mac, hdr->addr2));
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if (hdrlen >= 24)
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printk(" A3=%s", print_mac(mac, hdr->addr3));
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if (hdrlen >= 30)
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printk(" A4=%s", print_mac(mac, hdr->addr4));
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printk("\n");
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}
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#else /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
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static inline void ieee80211_dump_frame(const char *ifname, const char *title,
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struct sk_buff *skb)
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{
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}
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#endif /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
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static u16 ieee80211_duration(struct ieee80211_txrx_data *tx, int group_addr,
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int next_frag_len)
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{
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int rate, mrate, erp, dur, i;
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struct ieee80211_rate *txrate = tx->u.tx.rate;
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struct ieee80211_local *local = tx->local;
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struct ieee80211_hw_mode *mode = tx->u.tx.mode;
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erp = txrate->flags & IEEE80211_RATE_ERP;
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/*
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* data and mgmt (except PS Poll):
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* - during CFP: 32768
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* - during contention period:
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* if addr1 is group address: 0
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* if more fragments = 0 and addr1 is individual address: time to
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* transmit one ACK plus SIFS
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* if more fragments = 1 and addr1 is individual address: time to
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* transmit next fragment plus 2 x ACK plus 3 x SIFS
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*
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* IEEE 802.11, 9.6:
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* - control response frame (CTS or ACK) shall be transmitted using the
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* same rate as the immediately previous frame in the frame exchange
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* sequence, if this rate belongs to the PHY mandatory rates, or else
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* at the highest possible rate belonging to the PHY rates in the
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* BSSBasicRateSet
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*/
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if ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL) {
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/* TODO: These control frames are not currently sent by
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* 80211.o, but should they be implemented, this function
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* needs to be updated to support duration field calculation.
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*
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* RTS: time needed to transmit pending data/mgmt frame plus
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* one CTS frame plus one ACK frame plus 3 x SIFS
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* CTS: duration of immediately previous RTS minus time
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* required to transmit CTS and its SIFS
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* ACK: 0 if immediately previous directed data/mgmt had
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* more=0, with more=1 duration in ACK frame is duration
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* from previous frame minus time needed to transmit ACK
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* and its SIFS
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* PS Poll: BIT(15) | BIT(14) | aid
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*/
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return 0;
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}
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/* data/mgmt */
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if (0 /* FIX: data/mgmt during CFP */)
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return 32768;
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if (group_addr) /* Group address as the destination - no ACK */
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return 0;
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/* Individual destination address:
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* IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
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* CTS and ACK frames shall be transmitted using the highest rate in
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* basic rate set that is less than or equal to the rate of the
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* immediately previous frame and that is using the same modulation
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* (CCK or OFDM). If no basic rate set matches with these requirements,
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* the highest mandatory rate of the PHY that is less than or equal to
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* the rate of the previous frame is used.
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* Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
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*/
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rate = -1;
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mrate = 10; /* use 1 Mbps if everything fails */
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for (i = 0; i < mode->num_rates; i++) {
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struct ieee80211_rate *r = &mode->rates[i];
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if (r->rate > txrate->rate)
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break;
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if (IEEE80211_RATE_MODULATION(txrate->flags) !=
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IEEE80211_RATE_MODULATION(r->flags))
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continue;
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if (r->flags & IEEE80211_RATE_BASIC)
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rate = r->rate;
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else if (r->flags & IEEE80211_RATE_MANDATORY)
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mrate = r->rate;
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}
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if (rate == -1) {
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/* No matching basic rate found; use highest suitable mandatory
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* PHY rate */
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rate = mrate;
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}
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/* Time needed to transmit ACK
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* (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
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* to closest integer */
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dur = ieee80211_frame_duration(local, 10, rate, erp,
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tx->sdata->bss_conf.use_short_preamble);
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if (next_frag_len) {
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/* Frame is fragmented: duration increases with time needed to
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* transmit next fragment plus ACK and 2 x SIFS. */
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dur *= 2; /* ACK + SIFS */
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/* next fragment */
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dur += ieee80211_frame_duration(local, next_frag_len,
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txrate->rate, erp,
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tx->sdata->bss_conf.use_short_preamble);
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}
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return dur;
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}
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static inline int __ieee80211_queue_stopped(const struct ieee80211_local *local,
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int queue)
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{
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return test_bit(IEEE80211_LINK_STATE_XOFF, &local->state[queue]);
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}
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static inline int __ieee80211_queue_pending(const struct ieee80211_local *local,
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int queue)
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{
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return test_bit(IEEE80211_LINK_STATE_PENDING, &local->state[queue]);
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}
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static int inline is_ieee80211_device(struct net_device *dev,
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struct net_device *master)
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{
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return (wdev_priv(dev->ieee80211_ptr) ==
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wdev_priv(master->ieee80211_ptr));
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}
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/* tx handlers */
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static ieee80211_txrx_result
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ieee80211_tx_h_check_assoc(struct ieee80211_txrx_data *tx)
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{
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#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
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struct sk_buff *skb = tx->skb;
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struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
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#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
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u32 sta_flags;
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if (unlikely(tx->flags & IEEE80211_TXRXD_TX_INJECTED))
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return TXRX_CONTINUE;
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if (unlikely(tx->local->sta_sw_scanning) &&
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((tx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
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(tx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PROBE_REQ))
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return TXRX_DROP;
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if (tx->flags & IEEE80211_TXRXD_TXPS_BUFFERED)
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return TXRX_CONTINUE;
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sta_flags = tx->sta ? tx->sta->flags : 0;
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if (likely(tx->flags & IEEE80211_TXRXD_TXUNICAST)) {
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if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
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tx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
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(tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)) {
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#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
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DECLARE_MAC_BUF(mac);
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printk(KERN_DEBUG "%s: dropped data frame to not "
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"associated station %s\n",
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tx->dev->name, print_mac(mac, hdr->addr1));
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#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
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I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
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return TXRX_DROP;
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}
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} else {
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if (unlikely((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
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tx->local->num_sta == 0 &&
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tx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS)) {
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/*
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* No associated STAs - no need to send multicast
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* frames.
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*/
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return TXRX_DROP;
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}
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return TXRX_CONTINUE;
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}
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return TXRX_CONTINUE;
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}
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static ieee80211_txrx_result
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ieee80211_tx_h_sequence(struct ieee80211_txrx_data *tx)
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{
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struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
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if (ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control)) >= 24)
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ieee80211_include_sequence(tx->sdata, hdr);
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return TXRX_CONTINUE;
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}
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/* This function is called whenever the AP is about to exceed the maximum limit
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* of buffered frames for power saving STAs. This situation should not really
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* happen often during normal operation, so dropping the oldest buffered packet
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* from each queue should be OK to make some room for new frames. */
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static void purge_old_ps_buffers(struct ieee80211_local *local)
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{
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int total = 0, purged = 0;
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struct sk_buff *skb;
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struct ieee80211_sub_if_data *sdata;
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struct sta_info *sta;
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/*
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* virtual interfaces are protected by RCU
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*/
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rcu_read_lock();
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list_for_each_entry_rcu(sdata, &local->interfaces, list) {
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struct ieee80211_if_ap *ap;
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if (sdata->dev == local->mdev ||
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sdata->vif.type != IEEE80211_IF_TYPE_AP)
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continue;
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ap = &sdata->u.ap;
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skb = skb_dequeue(&ap->ps_bc_buf);
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if (skb) {
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purged++;
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dev_kfree_skb(skb);
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}
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total += skb_queue_len(&ap->ps_bc_buf);
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}
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rcu_read_unlock();
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read_lock_bh(&local->sta_lock);
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list_for_each_entry(sta, &local->sta_list, list) {
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skb = skb_dequeue(&sta->ps_tx_buf);
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if (skb) {
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purged++;
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dev_kfree_skb(skb);
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}
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total += skb_queue_len(&sta->ps_tx_buf);
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}
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read_unlock_bh(&local->sta_lock);
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local->total_ps_buffered = total;
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printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
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wiphy_name(local->hw.wiphy), purged);
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}
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static ieee80211_txrx_result
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ieee80211_tx_h_multicast_ps_buf(struct ieee80211_txrx_data *tx)
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{
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/*
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* broadcast/multicast frame
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*
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* If any of the associated stations is in power save mode,
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* the frame is buffered to be sent after DTIM beacon frame.
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* This is done either by the hardware or us.
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*/
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/* not AP/IBSS or ordered frame */
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if (!tx->sdata->bss || (tx->fc & IEEE80211_FCTL_ORDER))
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return TXRX_CONTINUE;
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/* no stations in PS mode */
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if (!atomic_read(&tx->sdata->bss->num_sta_ps))
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return TXRX_CONTINUE;
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/* buffered in mac80211 */
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if (tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) {
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if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
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purge_old_ps_buffers(tx->local);
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if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >=
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AP_MAX_BC_BUFFER) {
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if (net_ratelimit()) {
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printk(KERN_DEBUG "%s: BC TX buffer full - "
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"dropping the oldest frame\n",
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tx->dev->name);
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}
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dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
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} else
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tx->local->total_ps_buffered++;
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skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
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return TXRX_QUEUED;
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}
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/* buffered in hardware */
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tx->u.tx.control->flags |= IEEE80211_TXCTL_SEND_AFTER_DTIM;
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return TXRX_CONTINUE;
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}
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static ieee80211_txrx_result
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ieee80211_tx_h_unicast_ps_buf(struct ieee80211_txrx_data *tx)
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{
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struct sta_info *sta = tx->sta;
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DECLARE_MAC_BUF(mac);
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if (unlikely(!sta ||
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((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT &&
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(tx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP)))
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return TXRX_CONTINUE;
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if (unlikely((sta->flags & WLAN_STA_PS) && !sta->pspoll)) {
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struct ieee80211_tx_packet_data *pkt_data;
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#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
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printk(KERN_DEBUG "STA %s aid %d: PS buffer (entries "
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"before %d)\n",
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print_mac(mac, sta->addr), sta->aid,
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skb_queue_len(&sta->ps_tx_buf));
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#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
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sta->flags |= WLAN_STA_TIM;
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if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
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purge_old_ps_buffers(tx->local);
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if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
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struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
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if (net_ratelimit()) {
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printk(KERN_DEBUG "%s: STA %s TX "
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"buffer full - dropping oldest frame\n",
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tx->dev->name, print_mac(mac, sta->addr));
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}
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dev_kfree_skb(old);
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} else
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tx->local->total_ps_buffered++;
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/* Queue frame to be sent after STA sends an PS Poll frame */
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if (skb_queue_empty(&sta->ps_tx_buf)) {
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if (tx->local->ops->set_tim)
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tx->local->ops->set_tim(local_to_hw(tx->local),
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sta->aid, 1);
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if (tx->sdata->bss)
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bss_tim_set(tx->local, tx->sdata->bss, sta->aid);
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}
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pkt_data = (struct ieee80211_tx_packet_data *)tx->skb->cb;
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pkt_data->jiffies = jiffies;
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skb_queue_tail(&sta->ps_tx_buf, tx->skb);
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return TXRX_QUEUED;
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}
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#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
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else if (unlikely(sta->flags & WLAN_STA_PS)) {
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printk(KERN_DEBUG "%s: STA %s in PS mode, but pspoll "
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"set -> send frame\n", tx->dev->name,
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print_mac(mac, sta->addr));
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}
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#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
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sta->pspoll = 0;
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return TXRX_CONTINUE;
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}
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static ieee80211_txrx_result
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ieee80211_tx_h_ps_buf(struct ieee80211_txrx_data *tx)
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{
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if (unlikely(tx->flags & IEEE80211_TXRXD_TXPS_BUFFERED))
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return TXRX_CONTINUE;
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if (tx->flags & IEEE80211_TXRXD_TXUNICAST)
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return ieee80211_tx_h_unicast_ps_buf(tx);
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else
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return ieee80211_tx_h_multicast_ps_buf(tx);
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}
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static ieee80211_txrx_result
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ieee80211_tx_h_select_key(struct ieee80211_txrx_data *tx)
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{
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struct ieee80211_key *key;
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u16 fc = tx->fc;
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if (unlikely(tx->u.tx.control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT))
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tx->key = NULL;
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else if (tx->sta && (key = rcu_dereference(tx->sta->key)))
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tx->key = key;
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else if ((key = rcu_dereference(tx->sdata->default_key)))
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tx->key = key;
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else if (tx->sdata->drop_unencrypted &&
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!(tx->u.tx.control->flags & IEEE80211_TXCTL_EAPOL_FRAME) &&
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!(tx->flags & IEEE80211_TXRXD_TX_INJECTED)) {
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I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
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return TXRX_DROP;
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} else
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tx->key = NULL;
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if (tx->key) {
|
|
u16 ftype, stype;
|
|
|
|
tx->key->tx_rx_count++;
|
|
/* TODO: add threshold stuff again */
|
|
|
|
switch (tx->key->conf.alg) {
|
|
case ALG_WEP:
|
|
ftype = fc & IEEE80211_FCTL_FTYPE;
|
|
stype = fc & IEEE80211_FCTL_STYPE;
|
|
|
|
if (ftype == IEEE80211_FTYPE_MGMT &&
|
|
stype == IEEE80211_STYPE_AUTH)
|
|
break;
|
|
case ALG_TKIP:
|
|
case ALG_CCMP:
|
|
if (!WLAN_FC_DATA_PRESENT(fc))
|
|
tx->key = NULL;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!tx->key || !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
|
|
tx->u.tx.control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
|
|
|
|
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;
|
|
u16 seq;
|
|
u8 *pos;
|
|
int frag_threshold = tx->local->fragmentation_threshold;
|
|
|
|
if (!(tx->flags & IEEE80211_TXRXD_FRAGMENTED))
|
|
return TXRX_CONTINUE;
|
|
|
|
first = tx->skb;
|
|
|
|
hdrlen = ieee80211_get_hdrlen(tx->fc);
|
|
payload_len = first->len - hdrlen;
|
|
per_fragm = frag_threshold - hdrlen - FCS_LEN;
|
|
num_fragm = DIV_ROUND_UP(payload_len, per_fragm);
|
|
|
|
frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC);
|
|
if (!frags)
|
|
goto fail;
|
|
|
|
hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
|
|
seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ;
|
|
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 */
|
|
frag = frags[i] =
|
|
dev_alloc_skb(tx->local->tx_headroom +
|
|
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, tx->local->tx_headroom +
|
|
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(~IEEE80211_FCTL_MOREFRAGS);
|
|
fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG));
|
|
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 ieee80211_txrx_result
|
|
ieee80211_tx_h_encrypt(struct ieee80211_txrx_data *tx)
|
|
{
|
|
if (!tx->key)
|
|
return TXRX_CONTINUE;
|
|
|
|
switch (tx->key->conf.alg) {
|
|
case ALG_WEP:
|
|
return ieee80211_crypto_wep_encrypt(tx);
|
|
case ALG_TKIP:
|
|
return ieee80211_crypto_tkip_encrypt(tx);
|
|
case ALG_CCMP:
|
|
return ieee80211_crypto_ccmp_encrypt(tx);
|
|
}
|
|
|
|
/* not reached */
|
|
WARN_ON(1);
|
|
return TXRX_DROP;
|
|
}
|
|
|
|
static ieee80211_txrx_result
|
|
ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data *tx)
|
|
{
|
|
struct rate_selection rsel;
|
|
|
|
if (likely(!tx->u.tx.rate)) {
|
|
rate_control_get_rate(tx->dev, tx->u.tx.mode, tx->skb, &rsel);
|
|
tx->u.tx.rate = rsel.rate;
|
|
if (unlikely(rsel.probe != NULL)) {
|
|
tx->u.tx.control->flags |=
|
|
IEEE80211_TXCTL_RATE_CTRL_PROBE;
|
|
tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
|
|
tx->u.tx.control->alt_retry_rate = tx->u.tx.rate->val;
|
|
tx->u.tx.rate = rsel.probe;
|
|
} else
|
|
tx->u.tx.control->alt_retry_rate = -1;
|
|
|
|
if (!tx->u.tx.rate)
|
|
return TXRX_DROP;
|
|
} else
|
|
tx->u.tx.control->alt_retry_rate = -1;
|
|
|
|
if (tx->u.tx.mode->mode == MODE_IEEE80211G &&
|
|
tx->sdata->bss_conf.use_cts_prot &&
|
|
(tx->flags & IEEE80211_TXRXD_FRAGMENTED) && rsel.nonerp) {
|
|
tx->u.tx.last_frag_rate = tx->u.tx.rate;
|
|
if (rsel.probe)
|
|
tx->flags &= ~IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
|
|
else
|
|
tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
|
|
tx->u.tx.rate = rsel.nonerp;
|
|
tx->u.tx.control->rate = rsel.nonerp;
|
|
tx->u.tx.control->flags &= ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
|
|
} else {
|
|
tx->u.tx.last_frag_rate = tx->u.tx.rate;
|
|
tx->u.tx.control->rate = tx->u.tx.rate;
|
|
}
|
|
tx->u.tx.control->tx_rate = tx->u.tx.rate->val;
|
|
|
|
return TXRX_CONTINUE;
|
|
}
|
|
|
|
static ieee80211_txrx_result
|
|
ieee80211_tx_h_misc(struct ieee80211_txrx_data *tx)
|
|
{
|
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
|
|
u16 fc = le16_to_cpu(hdr->frame_control);
|
|
u16 dur;
|
|
struct ieee80211_tx_control *control = tx->u.tx.control;
|
|
struct ieee80211_hw_mode *mode = tx->u.tx.mode;
|
|
|
|
if (!control->retry_limit) {
|
|
if (!is_multicast_ether_addr(hdr->addr1)) {
|
|
if (tx->skb->len + FCS_LEN > tx->local->rts_threshold
|
|
&& tx->local->rts_threshold <
|
|
IEEE80211_MAX_RTS_THRESHOLD) {
|
|
control->flags |=
|
|
IEEE80211_TXCTL_USE_RTS_CTS;
|
|
control->flags |=
|
|
IEEE80211_TXCTL_LONG_RETRY_LIMIT;
|
|
control->retry_limit =
|
|
tx->local->long_retry_limit;
|
|
} else {
|
|
control->retry_limit =
|
|
tx->local->short_retry_limit;
|
|
}
|
|
} else {
|
|
control->retry_limit = 1;
|
|
}
|
|
}
|
|
|
|
if (tx->flags & IEEE80211_TXRXD_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 (mode->mode == MODE_IEEE80211G &&
|
|
(tx->u.tx.rate->flags & IEEE80211_RATE_ERP) &&
|
|
(tx->flags & IEEE80211_TXRXD_TXUNICAST) &&
|
|
tx->sdata->bss_conf.use_cts_prot &&
|
|
!(control->flags & IEEE80211_TXCTL_USE_RTS_CTS))
|
|
control->flags |= IEEE80211_TXCTL_USE_CTS_PROTECT;
|
|
|
|
/* Transmit data frames using short preambles if the driver supports
|
|
* short preambles at the selected rate and short preambles are
|
|
* available on the network at the current point in time. */
|
|
if (((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
|
|
(tx->u.tx.rate->flags & IEEE80211_RATE_PREAMBLE2) &&
|
|
tx->sdata->bss_conf.use_short_preamble &&
|
|
(!tx->sta || (tx->sta->flags & WLAN_STA_SHORT_PREAMBLE))) {
|
|
tx->u.tx.control->tx_rate = tx->u.tx.rate->val2;
|
|
}
|
|
|
|
/* 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, is_multicast_ether_addr(hdr->addr1),
|
|
(tx->flags & IEEE80211_TXRXD_FRAGMENTED) ?
|
|
tx->u.tx.extra_frag[0]->len : 0);
|
|
hdr->duration_id = cpu_to_le16(dur);
|
|
|
|
if ((control->flags & IEEE80211_TXCTL_USE_RTS_CTS) ||
|
|
(control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)) {
|
|
struct ieee80211_rate *rate;
|
|
|
|
/* 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 > mode->rates &&
|
|
!(rate->flags & IEEE80211_RATE_BASIC))
|
|
rate--;
|
|
|
|
control->rts_cts_rate = rate->val;
|
|
control->rts_rate = rate;
|
|
}
|
|
|
|
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;
|
|
}
|
|
}
|
|
}
|
|
|
|
return TXRX_CONTINUE;
|
|
}
|
|
|
|
static ieee80211_txrx_result
|
|
ieee80211_tx_h_load_stats(struct ieee80211_txrx_data *tx)
|
|
{
|
|
struct ieee80211_local *local = tx->local;
|
|
struct ieee80211_hw_mode *mode = tx->u.tx.mode;
|
|
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 (mode->mode == MODE_IEEE80211A ||
|
|
(mode->mode == MODE_IEEE80211G &&
|
|
tx->u.tx.rate->flags & IEEE80211_RATE_ERP))
|
|
hdrtime = CHAN_UTIL_HDR_SHORT;
|
|
else
|
|
hdrtime = CHAN_UTIL_HDR_LONG;
|
|
|
|
load = hdrtime;
|
|
if (!is_multicast_ether_addr(hdr->addr1))
|
|
load += hdrtime;
|
|
|
|
if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_RTS_CTS)
|
|
load += 2 * hdrtime;
|
|
else if (tx->u.tx.control->flags & IEEE80211_TXCTL_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;
|
|
}
|
|
|
|
/* TODO: implement register/unregister functions for adding TX/RX handlers
|
|
* into ordered list */
|
|
|
|
ieee80211_tx_handler ieee80211_tx_handlers[] =
|
|
{
|
|
ieee80211_tx_h_check_assoc,
|
|
ieee80211_tx_h_sequence,
|
|
ieee80211_tx_h_ps_buf,
|
|
ieee80211_tx_h_select_key,
|
|
ieee80211_tx_h_michael_mic_add,
|
|
ieee80211_tx_h_fragment,
|
|
ieee80211_tx_h_encrypt,
|
|
ieee80211_tx_h_rate_ctrl,
|
|
ieee80211_tx_h_misc,
|
|
ieee80211_tx_h_load_stats,
|
|
NULL
|
|
};
|
|
|
|
/* actual transmit path */
|
|
|
|
/*
|
|
* deal with packet injection down monitor interface
|
|
* with Radiotap Header -- only called for monitor mode interface
|
|
*/
|
|
static ieee80211_txrx_result
|
|
__ieee80211_parse_tx_radiotap(struct ieee80211_txrx_data *tx,
|
|
struct sk_buff *skb)
|
|
{
|
|
/*
|
|
* this is the moment to interpret and discard the radiotap header that
|
|
* must be at the start of the packet injected in Monitor mode
|
|
*
|
|
* Need to take some care with endian-ness since radiotap
|
|
* args are little-endian
|
|
*/
|
|
|
|
struct ieee80211_radiotap_iterator iterator;
|
|
struct ieee80211_radiotap_header *rthdr =
|
|
(struct ieee80211_radiotap_header *) skb->data;
|
|
struct ieee80211_hw_mode *mode = tx->local->hw.conf.mode;
|
|
int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
|
|
struct ieee80211_tx_control *control = tx->u.tx.control;
|
|
|
|
control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
|
|
tx->flags |= IEEE80211_TXRXD_TX_INJECTED;
|
|
tx->flags &= ~IEEE80211_TXRXD_FRAGMENTED;
|
|
|
|
/*
|
|
* for every radiotap entry that is present
|
|
* (ieee80211_radiotap_iterator_next returns -ENOENT when no more
|
|
* entries present, or -EINVAL on error)
|
|
*/
|
|
|
|
while (!ret) {
|
|
int i, target_rate;
|
|
|
|
ret = ieee80211_radiotap_iterator_next(&iterator);
|
|
|
|
if (ret)
|
|
continue;
|
|
|
|
/* see if this argument is something we can use */
|
|
switch (iterator.this_arg_index) {
|
|
/*
|
|
* You must take care when dereferencing iterator.this_arg
|
|
* for multibyte types... the pointer is not aligned. Use
|
|
* get_unaligned((type *)iterator.this_arg) to dereference
|
|
* iterator.this_arg for type "type" safely on all arches.
|
|
*/
|
|
case IEEE80211_RADIOTAP_RATE:
|
|
/*
|
|
* radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
|
|
* ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
|
|
*/
|
|
target_rate = (*iterator.this_arg) * 5;
|
|
for (i = 0; i < mode->num_rates; i++) {
|
|
struct ieee80211_rate *r = &mode->rates[i];
|
|
|
|
if (r->rate == target_rate) {
|
|
tx->u.tx.rate = r;
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case IEEE80211_RADIOTAP_ANTENNA:
|
|
/*
|
|
* radiotap uses 0 for 1st ant, mac80211 is 1 for
|
|
* 1st ant
|
|
*/
|
|
control->antenna_sel_tx = (*iterator.this_arg) + 1;
|
|
break;
|
|
|
|
case IEEE80211_RADIOTAP_DBM_TX_POWER:
|
|
control->power_level = *iterator.this_arg;
|
|
break;
|
|
|
|
case IEEE80211_RADIOTAP_FLAGS:
|
|
if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
|
|
/*
|
|
* this indicates that the skb we have been
|
|
* handed has the 32-bit FCS CRC at the end...
|
|
* we should react to that by snipping it off
|
|
* because it will be recomputed and added
|
|
* on transmission
|
|
*/
|
|
if (skb->len < (iterator.max_length + FCS_LEN))
|
|
return TXRX_DROP;
|
|
|
|
skb_trim(skb, skb->len - FCS_LEN);
|
|
}
|
|
if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
|
|
control->flags &=
|
|
~IEEE80211_TXCTL_DO_NOT_ENCRYPT;
|
|
if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
|
|
tx->flags |= IEEE80211_TXRXD_FRAGMENTED;
|
|
break;
|
|
|
|
/*
|
|
* Please update the file
|
|
* Documentation/networking/mac80211-injection.txt
|
|
* when parsing new fields here.
|
|
*/
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
|
|
return TXRX_DROP;
|
|
|
|
/*
|
|
* remove the radiotap header
|
|
* iterator->max_length was sanity-checked against
|
|
* skb->len by iterator init
|
|
*/
|
|
skb_pull(skb, iterator.max_length);
|
|
|
|
return TXRX_CONTINUE;
|
|
}
|
|
|
|
/*
|
|
* initialises @tx
|
|
*/
|
|
static ieee80211_txrx_result
|
|
__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 = wdev_priv(dev->ieee80211_ptr);
|
|
struct ieee80211_hdr *hdr;
|
|
struct ieee80211_sub_if_data *sdata;
|
|
|
|
int hdrlen;
|
|
|
|
memset(tx, 0, sizeof(*tx));
|
|
tx->skb = skb;
|
|
tx->dev = dev; /* use original interface */
|
|
tx->local = local;
|
|
tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
|
|
tx->u.tx.control = control;
|
|
/*
|
|
* Set this flag (used below to indicate "automatic fragmentation"),
|
|
* it will be cleared/left by radiotap as desired.
|
|
*/
|
|
tx->flags |= IEEE80211_TXRXD_FRAGMENTED;
|
|
|
|
/* process and remove the injection radiotap header */
|
|
sdata = IEEE80211_DEV_TO_SUB_IF(dev);
|
|
if (unlikely(sdata->vif.type == IEEE80211_IF_TYPE_MNTR)) {
|
|
if (__ieee80211_parse_tx_radiotap(tx, skb) == TXRX_DROP)
|
|
return TXRX_DROP;
|
|
|
|
/*
|
|
* __ieee80211_parse_tx_radiotap has now removed
|
|
* the radiotap header that was present and pre-filled
|
|
* 'tx' with tx control information.
|
|
*/
|
|
}
|
|
|
|
hdr = (struct ieee80211_hdr *) skb->data;
|
|
|
|
tx->sta = sta_info_get(local, hdr->addr1);
|
|
tx->fc = le16_to_cpu(hdr->frame_control);
|
|
|
|
if (is_multicast_ether_addr(hdr->addr1)) {
|
|
tx->flags &= ~IEEE80211_TXRXD_TXUNICAST;
|
|
control->flags |= IEEE80211_TXCTL_NO_ACK;
|
|
} else {
|
|
tx->flags |= IEEE80211_TXRXD_TXUNICAST;
|
|
control->flags &= ~IEEE80211_TXCTL_NO_ACK;
|
|
}
|
|
|
|
if (tx->flags & IEEE80211_TXRXD_FRAGMENTED) {
|
|
if ((tx->flags & IEEE80211_TXRXD_TXUNICAST) &&
|
|
skb->len + FCS_LEN > local->fragmentation_threshold &&
|
|
!local->ops->set_frag_threshold)
|
|
tx->flags |= IEEE80211_TXRXD_FRAGMENTED;
|
|
else
|
|
tx->flags &= ~IEEE80211_TXRXD_FRAGMENTED;
|
|
}
|
|
|
|
if (!tx->sta)
|
|
control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
|
|
else if (tx->sta->clear_dst_mask) {
|
|
control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
|
|
tx->sta->clear_dst_mask = 0;
|
|
}
|
|
|
|
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];
|
|
}
|
|
control->flags |= IEEE80211_TXCTL_FIRST_FRAGMENT;
|
|
|
|
return TXRX_CONTINUE;
|
|
}
|
|
|
|
/*
|
|
* NB: @tx is uninitialised when passed in here
|
|
*/
|
|
static int ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
|
|
struct sk_buff *skb,
|
|
struct net_device *mdev,
|
|
struct ieee80211_tx_control *control)
|
|
{
|
|
struct ieee80211_tx_packet_data *pkt_data;
|
|
struct net_device *dev;
|
|
|
|
pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
|
|
dev = dev_get_by_index(&init_net, pkt_data->ifindex);
|
|
if (unlikely(dev && !is_ieee80211_device(dev, mdev))) {
|
|
dev_put(dev);
|
|
dev = NULL;
|
|
}
|
|
if (unlikely(!dev))
|
|
return -ENODEV;
|
|
/* initialises tx with control */
|
|
__ieee80211_tx_prepare(tx, skb, dev, control);
|
|
dev_put(dev);
|
|
return 0;
|
|
}
|
|
|
|
static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb,
|
|
struct ieee80211_txrx_data *tx)
|
|
{
|
|
struct ieee80211_tx_control *control = tx->u.tx.control;
|
|
int ret, i;
|
|
|
|
if (!ieee80211_qdisc_installed(local->mdev) &&
|
|
__ieee80211_queue_stopped(local, 0)) {
|
|
netif_stop_queue(local->mdev);
|
|
return IEEE80211_TX_AGAIN;
|
|
}
|
|
if (skb) {
|
|
ieee80211_dump_frame(wiphy_name(local->hw.wiphy),
|
|
"TX to low-level driver", skb);
|
|
ret = local->ops->tx(local_to_hw(local), skb, control);
|
|
if (ret)
|
|
return IEEE80211_TX_AGAIN;
|
|
local->mdev->trans_start = jiffies;
|
|
ieee80211_led_tx(local, 1);
|
|
}
|
|
if (tx->u.tx.extra_frag) {
|
|
control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
|
|
IEEE80211_TXCTL_USE_CTS_PROTECT |
|
|
IEEE80211_TXCTL_CLEAR_DST_MASK |
|
|
IEEE80211_TXCTL_FIRST_FRAGMENT);
|
|
for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
|
|
if (!tx->u.tx.extra_frag[i])
|
|
continue;
|
|
if (__ieee80211_queue_stopped(local, control->queue))
|
|
return IEEE80211_TX_FRAG_AGAIN;
|
|
if (i == tx->u.tx.num_extra_frag) {
|
|
control->tx_rate = tx->u.tx.last_frag_hwrate;
|
|
control->rate = tx->u.tx.last_frag_rate;
|
|
if (tx->flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG)
|
|
control->flags |=
|
|
IEEE80211_TXCTL_RATE_CTRL_PROBE;
|
|
else
|
|
control->flags &=
|
|
~IEEE80211_TXCTL_RATE_CTRL_PROBE;
|
|
}
|
|
|
|
ieee80211_dump_frame(wiphy_name(local->hw.wiphy),
|
|
"TX to low-level driver",
|
|
tx->u.tx.extra_frag[i]);
|
|
ret = local->ops->tx(local_to_hw(local),
|
|
tx->u.tx.extra_frag[i],
|
|
control);
|
|
if (ret)
|
|
return IEEE80211_TX_FRAG_AGAIN;
|
|
local->mdev->trans_start = jiffies;
|
|
ieee80211_led_tx(local, 1);
|
|
tx->u.tx.extra_frag[i] = NULL;
|
|
}
|
|
kfree(tx->u.tx.extra_frag);
|
|
tx->u.tx.extra_frag = NULL;
|
|
}
|
|
return IEEE80211_TX_OK;
|
|
}
|
|
|
|
static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb,
|
|
struct ieee80211_tx_control *control)
|
|
{
|
|
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
|
|
struct sta_info *sta;
|
|
ieee80211_tx_handler *handler;
|
|
struct ieee80211_txrx_data tx;
|
|
ieee80211_txrx_result res = TXRX_DROP, res_prepare;
|
|
int ret, i;
|
|
|
|
WARN_ON(__ieee80211_queue_pending(local, control->queue));
|
|
|
|
if (unlikely(skb->len < 10)) {
|
|
dev_kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
/* initialises tx */
|
|
res_prepare = __ieee80211_tx_prepare(&tx, skb, dev, control);
|
|
|
|
if (res_prepare == TXRX_DROP) {
|
|
dev_kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* key references are protected using RCU and this requires that
|
|
* we are in a read-site RCU section during receive processing
|
|
*/
|
|
rcu_read_lock();
|
|
|
|
sta = tx.sta;
|
|
tx.u.tx.mode = local->hw.conf.mode;
|
|
|
|
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_put(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);
|
|
rcu_read_unlock();
|
|
return 0;
|
|
}
|
|
|
|
if (tx.u.tx.extra_frag) {
|
|
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.last_frag_hwrate = tx.u.tx.rate->val;
|
|
}
|
|
dur = ieee80211_duration(&tx, 0, next_len);
|
|
hdr->duration_id = cpu_to_le16(dur);
|
|
}
|
|
}
|
|
|
|
retry:
|
|
ret = __ieee80211_tx(local, skb, &tx);
|
|
if (ret) {
|
|
struct ieee80211_tx_stored_packet *store =
|
|
&local->pending_packet[control->queue];
|
|
|
|
if (ret == IEEE80211_TX_FRAG_AGAIN)
|
|
skb = NULL;
|
|
set_bit(IEEE80211_LINK_STATE_PENDING,
|
|
&local->state[control->queue]);
|
|
smp_mb();
|
|
/* When the driver gets out of buffers during sending of
|
|
* fragments and calls ieee80211_stop_queue, there is
|
|
* a small window between IEEE80211_LINK_STATE_XOFF and
|
|
* IEEE80211_LINK_STATE_PENDING flags are set. If a buffer
|
|
* gets available in that window (i.e. driver calls
|
|
* ieee80211_wake_queue), we would end up with ieee80211_tx
|
|
* called with IEEE80211_LINK_STATE_PENDING. Prevent this by
|
|
* continuing transmitting here when that situation is
|
|
* possible to have happened. */
|
|
if (!__ieee80211_queue_stopped(local, control->queue)) {
|
|
clear_bit(IEEE80211_LINK_STATE_PENDING,
|
|
&local->state[control->queue]);
|
|
goto retry;
|
|
}
|
|
memcpy(&store->control, control,
|
|
sizeof(struct ieee80211_tx_control));
|
|
store->skb = skb;
|
|
store->extra_frag = tx.u.tx.extra_frag;
|
|
store->num_extra_frag = tx.u.tx.num_extra_frag;
|
|
store->last_frag_hwrate = tx.u.tx.last_frag_hwrate;
|
|
store->last_frag_rate = tx.u.tx.last_frag_rate;
|
|
store->last_frag_rate_ctrl_probe =
|
|
!!(tx.flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG);
|
|
}
|
|
rcu_read_unlock();
|
|
return 0;
|
|
|
|
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);
|
|
rcu_read_unlock();
|
|
return 0;
|
|
}
|
|
|
|
/* device xmit handlers */
|
|
|
|
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 net_device *odev = NULL;
|
|
struct ieee80211_sub_if_data *osdata;
|
|
int headroom;
|
|
int ret;
|
|
|
|
/*
|
|
* copy control out of the skb so other people can use skb->cb
|
|
*/
|
|
pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
|
|
memset(&control, 0, sizeof(struct ieee80211_tx_control));
|
|
|
|
if (pkt_data->ifindex)
|
|
odev = dev_get_by_index(&init_net, pkt_data->ifindex);
|
|
if (unlikely(odev && !is_ieee80211_device(odev, dev))) {
|
|
dev_put(odev);
|
|
odev = NULL;
|
|
}
|
|
if (unlikely(!odev)) {
|
|
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
|
|
printk(KERN_DEBUG "%s: Discarded packet with nonexistent "
|
|
"originating device\n", dev->name);
|
|
#endif
|
|
dev_kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
osdata = IEEE80211_DEV_TO_SUB_IF(odev);
|
|
|
|
headroom = osdata->local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM;
|
|
if (skb_headroom(skb) < headroom) {
|
|
if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
|
|
dev_kfree_skb(skb);
|
|
dev_put(odev);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
control.vif = &osdata->vif;
|
|
control.type = osdata->vif.type;
|
|
if (pkt_data->flags & IEEE80211_TXPD_REQ_TX_STATUS)
|
|
control.flags |= IEEE80211_TXCTL_REQ_TX_STATUS;
|
|
if (pkt_data->flags & IEEE80211_TXPD_DO_NOT_ENCRYPT)
|
|
control.flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
|
|
if (pkt_data->flags & IEEE80211_TXPD_REQUEUE)
|
|
control.flags |= IEEE80211_TXCTL_REQUEUE;
|
|
if (pkt_data->flags & IEEE80211_TXPD_EAPOL_FRAME)
|
|
control.flags |= IEEE80211_TXCTL_EAPOL_FRAME;
|
|
control.queue = pkt_data->queue;
|
|
|
|
ret = ieee80211_tx(odev, skb, &control);
|
|
dev_put(odev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int ieee80211_monitor_start_xmit(struct sk_buff *skb,
|
|
struct net_device *dev)
|
|
{
|
|
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
|
|
struct ieee80211_tx_packet_data *pkt_data;
|
|
struct ieee80211_radiotap_header *prthdr =
|
|
(struct ieee80211_radiotap_header *)skb->data;
|
|
u16 len_rthdr;
|
|
|
|
/* check for not even having the fixed radiotap header part */
|
|
if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
|
|
goto fail; /* too short to be possibly valid */
|
|
|
|
/* is it a header version we can trust to find length from? */
|
|
if (unlikely(prthdr->it_version))
|
|
goto fail; /* only version 0 is supported */
|
|
|
|
/* then there must be a radiotap header with a length we can use */
|
|
len_rthdr = ieee80211_get_radiotap_len(skb->data);
|
|
|
|
/* does the skb contain enough to deliver on the alleged length? */
|
|
if (unlikely(skb->len < len_rthdr))
|
|
goto fail; /* skb too short for claimed rt header extent */
|
|
|
|
skb->dev = local->mdev;
|
|
|
|
pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
|
|
memset(pkt_data, 0, sizeof(*pkt_data));
|
|
/* needed because we set skb device to master */
|
|
pkt_data->ifindex = dev->ifindex;
|
|
|
|
pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
|
|
|
|
/*
|
|
* fix up the pointers accounting for the radiotap
|
|
* header still being in there. We are being given
|
|
* a precooked IEEE80211 header so no need for
|
|
* normal processing
|
|
*/
|
|
skb_set_mac_header(skb, len_rthdr);
|
|
/*
|
|
* these are just fixed to the end of the rt area since we
|
|
* don't have any better information and at this point, nobody cares
|
|
*/
|
|
skb_set_network_header(skb, len_rthdr);
|
|
skb_set_transport_header(skb, len_rthdr);
|
|
|
|
/* pass the radiotap header up to the next stage intact */
|
|
dev_queue_xmit(skb);
|
|
return NETDEV_TX_OK;
|
|
|
|
fail:
|
|
dev_kfree_skb(skb);
|
|
return NETDEV_TX_OK; /* meaning, we dealt with the skb */
|
|
}
|
|
|
|
/**
|
|
* 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).
|
|
*/
|
|
int ieee80211_subif_start_xmit(struct sk_buff *skb,
|
|
struct net_device *dev)
|
|
{
|
|
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
|
|
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;
|
|
const u8 *encaps_data;
|
|
int encaps_len, skip_header_bytes;
|
|
int nh_pos, h_pos;
|
|
struct sta_info *sta;
|
|
u32 sta_flags = 0;
|
|
|
|
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_network_header(skb) - skb->data;
|
|
h_pos = skb_transport_header(skb) - skb->data;
|
|
|
|
/* convert Ethernet header to proper 802.11 header (based on
|
|
* operation mode) */
|
|
ethertype = (skb->data[12] << 8) | skb->data[13];
|
|
fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA;
|
|
|
|
switch (sdata->vif.type) {
|
|
case IEEE80211_IF_TYPE_AP:
|
|
case IEEE80211_IF_TYPE_VLAN:
|
|
fc |= IEEE80211_FCTL_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);
|
|
hdrlen = 24;
|
|
break;
|
|
case IEEE80211_IF_TYPE_WDS:
|
|
fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_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;
|
|
break;
|
|
case IEEE80211_IF_TYPE_STA:
|
|
fc |= IEEE80211_FCTL_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);
|
|
hdrlen = 24;
|
|
break;
|
|
case IEEE80211_IF_TYPE_IBSS:
|
|
/* 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;
|
|
break;
|
|
default:
|
|
ret = 0;
|
|
goto fail;
|
|
}
|
|
|
|
sta = sta_info_get(local, hdr.addr1);
|
|
if (sta) {
|
|
sta_flags = sta->flags;
|
|
sta_info_put(sta);
|
|
}
|
|
|
|
/* receiver is QoS enabled, use a QoS type frame */
|
|
if (sta_flags & WLAN_STA_WME) {
|
|
fc |= IEEE80211_STYPE_QOS_DATA;
|
|
hdrlen += 2;
|
|
}
|
|
|
|
/*
|
|
* If port access control is enabled, drop frames to unauthorised
|
|
* stations unless they are EAPOL frames from the local station.
|
|
*/
|
|
if (unlikely(sdata->ieee802_1x_pac &&
|
|
!(sta_flags & WLAN_STA_AUTHORIZED) &&
|
|
!(ethertype == ETH_P_PAE &&
|
|
compare_ether_addr(dev->dev_addr,
|
|
skb->data + ETH_ALEN) == 0))) {
|
|
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
|
|
DECLARE_MAC_BUF(mac);
|
|
|
|
if (net_ratelimit())
|
|
printk(KERN_DEBUG "%s: dropped frame to %s"
|
|
" (unauthorized port)\n", dev->name,
|
|
print_mac(mac, hdr.addr1));
|
|
#endif
|
|
|
|
I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
|
|
|
|
ret = 0;
|
|
goto fail;
|
|
}
|
|
|
|
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->tx_headroom;
|
|
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;
|
|
}
|
|
|
|
if (fc & IEEE80211_STYPE_QOS_DATA) {
|
|
__le16 *qos_control;
|
|
|
|
qos_control = (__le16*) skb_push(skb, 2);
|
|
memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
|
|
/*
|
|
* Maybe we could actually set some fields here, for now just
|
|
* initialise to zero to indicate no special operation.
|
|
*/
|
|
*qos_control = 0;
|
|
} else
|
|
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->ifindex = dev->ifindex;
|
|
if (ethertype == ETH_P_PAE)
|
|
pkt_data->flags |= IEEE80211_TXPD_EAPOL_FRAME;
|
|
|
|
skb->dev = local->mdev;
|
|
dev->stats.tx_packets++;
|
|
dev->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_set_mac_header(skb, 0);
|
|
skb_set_network_header(skb, nh_pos);
|
|
skb_set_transport_header(skb, h_pos);
|
|
|
|
dev->trans_start = jiffies;
|
|
dev_queue_xmit(skb);
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
if (!ret)
|
|
dev_kfree_skb(skb);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* helper functions for pending packets for when queues are stopped */
|
|
|
|
void ieee80211_clear_tx_pending(struct ieee80211_local *local)
|
|
{
|
|
int i, j;
|
|
struct ieee80211_tx_stored_packet *store;
|
|
|
|
for (i = 0; i < local->hw.queues; i++) {
|
|
if (!__ieee80211_queue_pending(local, i))
|
|
continue;
|
|
store = &local->pending_packet[i];
|
|
kfree_skb(store->skb);
|
|
for (j = 0; j < store->num_extra_frag; j++)
|
|
kfree_skb(store->extra_frag[j]);
|
|
kfree(store->extra_frag);
|
|
clear_bit(IEEE80211_LINK_STATE_PENDING, &local->state[i]);
|
|
}
|
|
}
|
|
|
|
void ieee80211_tx_pending(unsigned long data)
|
|
{
|
|
struct ieee80211_local *local = (struct ieee80211_local *)data;
|
|
struct net_device *dev = local->mdev;
|
|
struct ieee80211_tx_stored_packet *store;
|
|
struct ieee80211_txrx_data tx;
|
|
int i, ret, reschedule = 0;
|
|
|
|
netif_tx_lock_bh(dev);
|
|
for (i = 0; i < local->hw.queues; i++) {
|
|
if (__ieee80211_queue_stopped(local, i))
|
|
continue;
|
|
if (!__ieee80211_queue_pending(local, i)) {
|
|
reschedule = 1;
|
|
continue;
|
|
}
|
|
store = &local->pending_packet[i];
|
|
tx.u.tx.control = &store->control;
|
|
tx.u.tx.extra_frag = store->extra_frag;
|
|
tx.u.tx.num_extra_frag = store->num_extra_frag;
|
|
tx.u.tx.last_frag_hwrate = store->last_frag_hwrate;
|
|
tx.u.tx.last_frag_rate = store->last_frag_rate;
|
|
tx.flags = 0;
|
|
if (store->last_frag_rate_ctrl_probe)
|
|
tx.flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
|
|
ret = __ieee80211_tx(local, store->skb, &tx);
|
|
if (ret) {
|
|
if (ret == IEEE80211_TX_FRAG_AGAIN)
|
|
store->skb = NULL;
|
|
} else {
|
|
clear_bit(IEEE80211_LINK_STATE_PENDING,
|
|
&local->state[i]);
|
|
reschedule = 1;
|
|
}
|
|
}
|
|
netif_tx_unlock_bh(dev);
|
|
if (reschedule) {
|
|
if (!ieee80211_qdisc_installed(dev)) {
|
|
if (!__ieee80211_queue_stopped(local, 0))
|
|
netif_wake_queue(dev);
|
|
} else
|
|
netif_schedule(dev);
|
|
}
|
|
}
|
|
|
|
/* functions for drivers to get certain frames */
|
|
|
|
static void ieee80211_beacon_add_tim(struct ieee80211_local *local,
|
|
struct ieee80211_if_ap *bss,
|
|
struct sk_buff *skb,
|
|
struct beacon_data *beacon)
|
|
{
|
|
u8 *pos, *tim;
|
|
int aid0 = 0;
|
|
int i, have_bits = 0, n1, n2;
|
|
|
|
/* Generate bitmap for TIM only if there are any STAs in power save
|
|
* mode. */
|
|
read_lock_bh(&local->sta_lock);
|
|
if (atomic_read(&bss->num_sta_ps) > 0)
|
|
/* in the hope that this is faster than
|
|
* checking byte-for-byte */
|
|
have_bits = !bitmap_empty((unsigned long*)bss->tim,
|
|
IEEE80211_MAX_AID+1);
|
|
|
|
if (bss->dtim_count == 0)
|
|
bss->dtim_count = beacon->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++ = beacon->dtim_period;
|
|
|
|
if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
|
|
aid0 = 1;
|
|
|
|
if (have_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 < IEEE80211_MAX_TIM_LEN; i++) {
|
|
if (bss->tim[i]) {
|
|
n1 = i & 0xfe;
|
|
break;
|
|
}
|
|
}
|
|
n2 = n1;
|
|
for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
|
|
if (bss->tim[i]) {
|
|
n2 = i;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Bitmap control */
|
|
*pos++ = n1 | aid0;
|
|
/* Part Virt Bitmap */
|
|
memcpy(pos, bss->tim + n1, n2 - n1 + 1);
|
|
|
|
tim[1] = n2 - n1 + 4;
|
|
skb_put(skb, n2 - n1);
|
|
} else {
|
|
*pos++ = aid0; /* Bitmap control */
|
|
*pos++ = 0; /* Part Virt Bitmap */
|
|
}
|
|
read_unlock_bh(&local->sta_lock);
|
|
}
|
|
|
|
struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw,
|
|
struct ieee80211_vif *vif,
|
|
struct ieee80211_tx_control *control)
|
|
{
|
|
struct ieee80211_local *local = hw_to_local(hw);
|
|
struct sk_buff *skb;
|
|
struct net_device *bdev;
|
|
struct ieee80211_sub_if_data *sdata = NULL;
|
|
struct ieee80211_if_ap *ap = NULL;
|
|
struct rate_selection rsel;
|
|
struct beacon_data *beacon;
|
|
|
|
rcu_read_lock();
|
|
|
|
sdata = vif_to_sdata(vif);
|
|
bdev = sdata->dev;
|
|
ap = &sdata->u.ap;
|
|
|
|
beacon = rcu_dereference(ap->beacon);
|
|
|
|
if (!ap || sdata->vif.type != IEEE80211_IF_TYPE_AP || !beacon) {
|
|
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
|
|
if (net_ratelimit())
|
|
printk(KERN_DEBUG "no beacon data avail for %s\n",
|
|
bdev->name);
|
|
#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
|
|
skb = NULL;
|
|
goto out;
|
|
}
|
|
|
|
/* headroom, head length, tail length and maximum TIM length */
|
|
skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
|
|
beacon->tail_len + 256);
|
|
if (!skb)
|
|
goto out;
|
|
|
|
skb_reserve(skb, local->tx_headroom);
|
|
memcpy(skb_put(skb, beacon->head_len), beacon->head,
|
|
beacon->head_len);
|
|
|
|
ieee80211_include_sequence(sdata, (struct ieee80211_hdr *)skb->data);
|
|
|
|
ieee80211_beacon_add_tim(local, ap, skb, beacon);
|
|
|
|
if (beacon->tail)
|
|
memcpy(skb_put(skb, beacon->tail_len), beacon->tail,
|
|
beacon->tail_len);
|
|
|
|
if (control) {
|
|
rate_control_get_rate(local->mdev, local->oper_hw_mode, skb,
|
|
&rsel);
|
|
if (!rsel.rate) {
|
|
if (net_ratelimit()) {
|
|
printk(KERN_DEBUG "%s: ieee80211_beacon_get: "
|
|
"no rate found\n",
|
|
wiphy_name(local->hw.wiphy));
|
|
}
|
|
dev_kfree_skb(skb);
|
|
skb = NULL;
|
|
goto out;
|
|
}
|
|
|
|
control->vif = vif;
|
|
control->tx_rate =
|
|
(sdata->bss_conf.use_short_preamble &&
|
|
(rsel.rate->flags & IEEE80211_RATE_PREAMBLE2)) ?
|
|
rsel.rate->val2 : rsel.rate->val;
|
|
control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
|
|
control->power_level = local->hw.conf.power_level;
|
|
control->flags |= IEEE80211_TXCTL_NO_ACK;
|
|
control->retry_limit = 1;
|
|
control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
|
|
}
|
|
|
|
ap->num_beacons++;
|
|
|
|
out:
|
|
rcu_read_unlock();
|
|
return skb;
|
|
}
|
|
EXPORT_SYMBOL(ieee80211_beacon_get);
|
|
|
|
void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
|
|
const void *frame, size_t frame_len,
|
|
const struct ieee80211_tx_control *frame_txctl,
|
|
struct ieee80211_rts *rts)
|
|
{
|
|
const struct ieee80211_hdr *hdr = frame;
|
|
u16 fctl;
|
|
|
|
fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS;
|
|
rts->frame_control = cpu_to_le16(fctl);
|
|
rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
|
|
frame_txctl);
|
|
memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
|
|
memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
|
|
}
|
|
EXPORT_SYMBOL(ieee80211_rts_get);
|
|
|
|
void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
|
|
const void *frame, size_t frame_len,
|
|
const struct ieee80211_tx_control *frame_txctl,
|
|
struct ieee80211_cts *cts)
|
|
{
|
|
const struct ieee80211_hdr *hdr = frame;
|
|
u16 fctl;
|
|
|
|
fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS;
|
|
cts->frame_control = cpu_to_le16(fctl);
|
|
cts->duration = ieee80211_ctstoself_duration(hw, vif,
|
|
frame_len, frame_txctl);
|
|
memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
|
|
}
|
|
EXPORT_SYMBOL(ieee80211_ctstoself_get);
|
|
|
|
struct sk_buff *
|
|
ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
|
|
struct ieee80211_vif *vif,
|
|
struct ieee80211_tx_control *control)
|
|
{
|
|
struct ieee80211_local *local = hw_to_local(hw);
|
|
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_ap *bss = NULL;
|
|
struct beacon_data *beacon;
|
|
|
|
sdata = vif_to_sdata(vif);
|
|
bdev = sdata->dev;
|
|
|
|
|
|
if (!bss)
|
|
return NULL;
|
|
|
|
rcu_read_lock();
|
|
beacon = rcu_dereference(bss->beacon);
|
|
|
|
if (sdata->vif.type != IEEE80211_IF_TYPE_AP || !beacon ||
|
|
!beacon->head) {
|
|
rcu_read_unlock();
|
|
return NULL;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
if (bss->dtim_count != 0)
|
|
return NULL; /* send buffered bc/mc only after DTIM beacon */
|
|
memset(control, 0, sizeof(*control));
|
|
while (1) {
|
|
skb = skb_dequeue(&bss->ps_bc_buf);
|
|
if (!skb)
|
|
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(IEEE80211_FCTL_MOREDATA);
|
|
}
|
|
|
|
if (!ieee80211_tx_prepare(&tx, skb, local->mdev, control))
|
|
break;
|
|
dev_kfree_skb_any(skb);
|
|
}
|
|
sta = tx.sta;
|
|
tx.flags |= IEEE80211_TXRXD_TXPS_BUFFERED;
|
|
tx.u.tx.mode = local->hw.conf.mode;
|
|
|
|
for (handler = local->tx_handlers; *handler != NULL; handler++) {
|
|
res = (*handler)(&tx);
|
|
if (res == TXRX_DROP || res == TXRX_QUEUED)
|
|
break;
|
|
}
|
|
skb = tx.skb; /* handlers are allowed to change skb */
|
|
|
|
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_put(sta);
|
|
|
|
return skb;
|
|
}
|
|
EXPORT_SYMBOL(ieee80211_get_buffered_bc);
|