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xianfeng |
/*
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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->flags & IEEE80211_SDATA_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->flags &
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IEEE80211_SDATA_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_scanning != 0) &&
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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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| 236 |
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sta_flags = tx->sta ? tx->sta->flags : 0;
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| 238 |
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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->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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| 248 |
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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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| 253 |
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tx->local->num_sta == 0 &&
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| 254 |
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tx->sdata->type != IEEE80211_IF_TYPE_IBSS)) {
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| 255 |
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/*
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| 256 |
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* No associated STAs - no need to send multicast
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| 257 |
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* frames.
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*/
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| 259 |
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return TXRX_DROP;
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| 260 |
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}
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| 261 |
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return TXRX_CONTINUE;
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| 262 |
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}
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| 263 |
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| 264 |
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if (unlikely(/* !injected && */ tx->sdata->ieee802_1x &&
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| 265 |
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!(sta_flags & WLAN_STA_AUTHORIZED))) {
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| 266 |
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#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
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| 267 |
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DECLARE_MAC_BUF(mac);
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| 268 |
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printk(KERN_DEBUG "%s: dropped frame to %s"
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| 269 |
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" (unauthorized port)\n", tx->dev->name,
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| 270 |
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print_mac(mac, hdr->addr1));
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| 271 |
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#endif
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| 272 |
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I802_DEBUG_INC(tx->local->tx_handlers_drop_unauth_port);
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| 273 |
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return TXRX_DROP;
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| 274 |
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}
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| 275 |
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| 276 |
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return TXRX_CONTINUE;
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| 277 |
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}
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| 278 |
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|
| 279 |
|
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static ieee80211_txrx_result
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| 280 |
|
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ieee80211_tx_h_sequence(struct ieee80211_txrx_data *tx)
|
| 281 |
|
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{
|
| 282 |
|
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struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
|
| 283 |
|
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|
| 284 |
|
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if (ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control)) >= 24)
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| 285 |
|
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ieee80211_include_sequence(tx->sdata, hdr);
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| 286 |
|
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|
| 287 |
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return TXRX_CONTINUE;
|
| 288 |
|
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}
|
| 289 |
|
|
|
| 290 |
|
|
/* This function is called whenever the AP is about to exceed the maximum limit
|
| 291 |
|
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* of buffered frames for power saving STAs. This situation should not really
|
| 292 |
|
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* happen often during normal operation, so dropping the oldest buffered packet
|
| 293 |
|
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* from each queue should be OK to make some room for new frames. */
|
| 294 |
|
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static void purge_old_ps_buffers(struct ieee80211_local *local)
|
| 295 |
|
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{
|
| 296 |
|
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int total = 0, purged = 0;
|
| 297 |
|
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struct sk_buff *skb;
|
| 298 |
|
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struct ieee80211_sub_if_data *sdata;
|
| 299 |
|
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struct sta_info *sta;
|
| 300 |
|
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|
| 301 |
|
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/*
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| 302 |
|
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* virtual interfaces are protected by RCU
|
| 303 |
|
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*/
|
| 304 |
|
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rcu_read_lock();
|
| 305 |
|
|
|
| 306 |
|
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list_for_each_entry_rcu(sdata, &local->interfaces, list) {
|
| 307 |
|
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struct ieee80211_if_ap *ap;
|
| 308 |
|
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if (sdata->dev == local->mdev ||
|
| 309 |
|
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sdata->type != IEEE80211_IF_TYPE_AP)
|
| 310 |
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continue;
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| 311 |
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ap = &sdata->u.ap;
|
| 312 |
|
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skb = skb_dequeue(&ap->ps_bc_buf);
|
| 313 |
|
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if (skb) {
|
| 314 |
|
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purged++;
|
| 315 |
|
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dev_kfree_skb(skb);
|
| 316 |
|
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}
|
| 317 |
|
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total += skb_queue_len(&ap->ps_bc_buf);
|
| 318 |
|
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}
|
| 319 |
|
|
rcu_read_unlock();
|
| 320 |
|
|
|
| 321 |
|
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read_lock_bh(&local->sta_lock);
|
| 322 |
|
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list_for_each_entry(sta, &local->sta_list, list) {
|
| 323 |
|
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skb = skb_dequeue(&sta->ps_tx_buf);
|
| 324 |
|
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if (skb) {
|
| 325 |
|
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purged++;
|
| 326 |
|
|
dev_kfree_skb(skb);
|
| 327 |
|
|
}
|
| 328 |
|
|
total += skb_queue_len(&sta->ps_tx_buf);
|
| 329 |
|
|
}
|
| 330 |
|
|
read_unlock_bh(&local->sta_lock);
|
| 331 |
|
|
|
| 332 |
|
|
local->total_ps_buffered = total;
|
| 333 |
|
|
printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
|
| 334 |
|
|
wiphy_name(local->hw.wiphy), purged);
|
| 335 |
|
|
}
|
| 336 |
|
|
|
| 337 |
|
|
static inline ieee80211_txrx_result
|
| 338 |
|
|
ieee80211_tx_h_multicast_ps_buf(struct ieee80211_txrx_data *tx)
|
| 339 |
|
|
{
|
| 340 |
|
|
/* broadcast/multicast frame */
|
| 341 |
|
|
/* If any of the associated stations is in power save mode,
|
| 342 |
|
|
* the frame is buffered to be sent after DTIM beacon frame */
|
| 343 |
|
|
if ((tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) &&
|
| 344 |
|
|
tx->sdata->type != IEEE80211_IF_TYPE_WDS &&
|
| 345 |
|
|
tx->sdata->bss && atomic_read(&tx->sdata->bss->num_sta_ps) &&
|
| 346 |
|
|
!(tx->fc & IEEE80211_FCTL_ORDER)) {
|
| 347 |
|
|
if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
|
| 348 |
|
|
purge_old_ps_buffers(tx->local);
|
| 349 |
|
|
if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >=
|
| 350 |
|
|
AP_MAX_BC_BUFFER) {
|
| 351 |
|
|
if (net_ratelimit()) {
|
| 352 |
|
|
printk(KERN_DEBUG "%s: BC TX buffer full - "
|
| 353 |
|
|
"dropping the oldest frame\n",
|
| 354 |
|
|
tx->dev->name);
|
| 355 |
|
|
}
|
| 356 |
|
|
dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
|
| 357 |
|
|
} else
|
| 358 |
|
|
tx->local->total_ps_buffered++;
|
| 359 |
|
|
skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
|
| 360 |
|
|
return TXRX_QUEUED;
|
| 361 |
|
|
}
|
| 362 |
|
|
|
| 363 |
|
|
return TXRX_CONTINUE;
|
| 364 |
|
|
}
|
| 365 |
|
|
|
| 366 |
|
|
static inline ieee80211_txrx_result
|
| 367 |
|
|
ieee80211_tx_h_unicast_ps_buf(struct ieee80211_txrx_data *tx)
|
| 368 |
|
|
{
|
| 369 |
|
|
struct sta_info *sta = tx->sta;
|
| 370 |
|
|
DECLARE_MAC_BUF(mac);
|
| 371 |
|
|
|
| 372 |
|
|
if (unlikely(!sta ||
|
| 373 |
|
|
((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT &&
|
| 374 |
|
|
(tx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP)))
|
| 375 |
|
|
return TXRX_CONTINUE;
|
| 376 |
|
|
|
| 377 |
|
|
if (unlikely((sta->flags & WLAN_STA_PS) && !sta->pspoll)) {
|
| 378 |
|
|
struct ieee80211_tx_packet_data *pkt_data;
|
| 379 |
|
|
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
|
| 380 |
|
|
printk(KERN_DEBUG "STA %s aid %d: PS buffer (entries "
|
| 381 |
|
|
"before %d)\n",
|
| 382 |
|
|
print_mac(mac, sta->addr), sta->aid,
|
| 383 |
|
|
skb_queue_len(&sta->ps_tx_buf));
|
| 384 |
|
|
#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
|
| 385 |
|
|
sta->flags |= WLAN_STA_TIM;
|
| 386 |
|
|
if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
|
| 387 |
|
|
purge_old_ps_buffers(tx->local);
|
| 388 |
|
|
if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
|
| 389 |
|
|
struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
|
| 390 |
|
|
if (net_ratelimit()) {
|
| 391 |
|
|
printk(KERN_DEBUG "%s: STA %s TX "
|
| 392 |
|
|
"buffer full - dropping oldest frame\n",
|
| 393 |
|
|
tx->dev->name, print_mac(mac, sta->addr));
|
| 394 |
|
|
}
|
| 395 |
|
|
dev_kfree_skb(old);
|
| 396 |
|
|
} else
|
| 397 |
|
|
tx->local->total_ps_buffered++;
|
| 398 |
|
|
/* Queue frame to be sent after STA sends an PS Poll frame */
|
| 399 |
|
|
if (skb_queue_empty(&sta->ps_tx_buf)) {
|
| 400 |
|
|
if (tx->local->ops->set_tim)
|
| 401 |
|
|
tx->local->ops->set_tim(local_to_hw(tx->local),
|
| 402 |
|
|
sta->aid, 1);
|
| 403 |
|
|
if (tx->sdata->bss)
|
| 404 |
|
|
bss_tim_set(tx->local, tx->sdata->bss, sta->aid);
|
| 405 |
|
|
}
|
| 406 |
|
|
pkt_data = (struct ieee80211_tx_packet_data *)tx->skb->cb;
|
| 407 |
|
|
pkt_data->jiffies = jiffies;
|
| 408 |
|
|
skb_queue_tail(&sta->ps_tx_buf, tx->skb);
|
| 409 |
|
|
return TXRX_QUEUED;
|
| 410 |
|
|
}
|
| 411 |
|
|
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
|
| 412 |
|
|
else if (unlikely(sta->flags & WLAN_STA_PS)) {
|
| 413 |
|
|
printk(KERN_DEBUG "%s: STA %s in PS mode, but pspoll "
|
| 414 |
|
|
"set -> send frame\n", tx->dev->name,
|
| 415 |
|
|
print_mac(mac, sta->addr));
|
| 416 |
|
|
}
|
| 417 |
|
|
#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
|
| 418 |
|
|
sta->pspoll = 0;
|
| 419 |
|
|
|
| 420 |
|
|
return TXRX_CONTINUE;
|
| 421 |
|
|
}
|
| 422 |
|
|
|
| 423 |
|
|
|
| 424 |
|
|
static ieee80211_txrx_result
|
| 425 |
|
|
ieee80211_tx_h_ps_buf(struct ieee80211_txrx_data *tx)
|
| 426 |
|
|
{
|
| 427 |
|
|
if (unlikely(tx->flags & IEEE80211_TXRXD_TXPS_BUFFERED))
|
| 428 |
|
|
return TXRX_CONTINUE;
|
| 429 |
|
|
|
| 430 |
|
|
if (tx->flags & IEEE80211_TXRXD_TXUNICAST)
|
| 431 |
|
|
return ieee80211_tx_h_unicast_ps_buf(tx);
|
| 432 |
|
|
else
|
| 433 |
|
|
return ieee80211_tx_h_multicast_ps_buf(tx);
|
| 434 |
|
|
}
|
| 435 |
|
|
|
| 436 |
|
|
|
| 437 |
|
|
|
| 438 |
|
|
|
| 439 |
|
|
static ieee80211_txrx_result
|
| 440 |
|
|
ieee80211_tx_h_select_key(struct ieee80211_txrx_data *tx)
|
| 441 |
|
|
{
|
| 442 |
|
|
struct ieee80211_key *key;
|
| 443 |
|
|
|
| 444 |
|
|
if (unlikely(tx->u.tx.control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT))
|
| 445 |
|
|
tx->key = NULL;
|
| 446 |
|
|
else if (tx->sta && (key = rcu_dereference(tx->sta->key)))
|
| 447 |
|
|
tx->key = key;
|
| 448 |
|
|
else if ((key = rcu_dereference(tx->sdata->default_key)))
|
| 449 |
|
|
tx->key = key;
|
| 450 |
|
|
else if (tx->sdata->drop_unencrypted &&
|
| 451 |
|
|
!(tx->sdata->eapol && ieee80211_is_eapol(tx->skb))) {
|
| 452 |
|
|
I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
|
| 453 |
|
|
return TXRX_DROP;
|
| 454 |
|
|
} else {
|
| 455 |
|
|
tx->key = NULL;
|
| 456 |
|
|
tx->u.tx.control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
|
| 457 |
|
|
}
|
| 458 |
|
|
|
| 459 |
|
|
if (tx->key) {
|
| 460 |
|
|
tx->key->tx_rx_count++;
|
| 461 |
|
|
/* TODO: add threshold stuff again */
|
| 462 |
|
|
}
|
| 463 |
|
|
|
| 464 |
|
|
return TXRX_CONTINUE;
|
| 465 |
|
|
}
|
| 466 |
|
|
|
| 467 |
|
|
static ieee80211_txrx_result
|
| 468 |
|
|
ieee80211_tx_h_fragment(struct ieee80211_txrx_data *tx)
|
| 469 |
|
|
{
|
| 470 |
|
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
|
| 471 |
|
|
size_t hdrlen, per_fragm, num_fragm, payload_len, left;
|
| 472 |
|
|
struct sk_buff **frags, *first, *frag;
|
| 473 |
|
|
int i;
|
| 474 |
|
|
u16 seq;
|
| 475 |
|
|
u8 *pos;
|
| 476 |
|
|
int frag_threshold = tx->local->fragmentation_threshold;
|
| 477 |
|
|
|
| 478 |
|
|
if (!(tx->flags & IEEE80211_TXRXD_FRAGMENTED))
|
| 479 |
|
|
return TXRX_CONTINUE;
|
| 480 |
|
|
|
| 481 |
|
|
first = tx->skb;
|
| 482 |
|
|
|
| 483 |
|
|
hdrlen = ieee80211_get_hdrlen(tx->fc);
|
| 484 |
|
|
payload_len = first->len - hdrlen;
|
| 485 |
|
|
per_fragm = frag_threshold - hdrlen - FCS_LEN;
|
| 486 |
|
|
num_fragm = DIV_ROUND_UP(payload_len, per_fragm);
|
| 487 |
|
|
|
| 488 |
|
|
frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC);
|
| 489 |
|
|
if (!frags)
|
| 490 |
|
|
goto fail;
|
| 491 |
|
|
|
| 492 |
|
|
hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
|
| 493 |
|
|
seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ;
|
| 494 |
|
|
pos = first->data + hdrlen + per_fragm;
|
| 495 |
|
|
left = payload_len - per_fragm;
|
| 496 |
|
|
for (i = 0; i < num_fragm - 1; i++) {
|
| 497 |
|
|
struct ieee80211_hdr *fhdr;
|
| 498 |
|
|
size_t copylen;
|
| 499 |
|
|
|
| 500 |
|
|
if (left <= 0)
|
| 501 |
|
|
goto fail;
|
| 502 |
|
|
|
| 503 |
|
|
/* reserve enough extra head and tail room for possible
|
| 504 |
|
|
* encryption */
|
| 505 |
|
|
frag = frags[i] =
|
| 506 |
|
|
dev_alloc_skb(tx->local->tx_headroom +
|
| 507 |
|
|
frag_threshold +
|
| 508 |
|
|
IEEE80211_ENCRYPT_HEADROOM +
|
| 509 |
|
|
IEEE80211_ENCRYPT_TAILROOM);
|
| 510 |
|
|
if (!frag)
|
| 511 |
|
|
goto fail;
|
| 512 |
|
|
/* Make sure that all fragments use the same priority so
|
| 513 |
|
|
* that they end up using the same TX queue */
|
| 514 |
|
|
frag->priority = first->priority;
|
| 515 |
|
|
skb_reserve(frag, tx->local->tx_headroom +
|
| 516 |
|
|
IEEE80211_ENCRYPT_HEADROOM);
|
| 517 |
|
|
fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen);
|
| 518 |
|
|
memcpy(fhdr, first->data, hdrlen);
|
| 519 |
|
|
if (i == num_fragm - 2)
|
| 520 |
|
|
fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS);
|
| 521 |
|
|
fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG));
|
| 522 |
|
|
copylen = left > per_fragm ? per_fragm : left;
|
| 523 |
|
|
memcpy(skb_put(frag, copylen), pos, copylen);
|
| 524 |
|
|
|
| 525 |
|
|
pos += copylen;
|
| 526 |
|
|
left -= copylen;
|
| 527 |
|
|
}
|
| 528 |
|
|
skb_trim(first, hdrlen + per_fragm);
|
| 529 |
|
|
|
| 530 |
|
|
tx->u.tx.num_extra_frag = num_fragm - 1;
|
| 531 |
|
|
tx->u.tx.extra_frag = frags;
|
| 532 |
|
|
|
| 533 |
|
|
return TXRX_CONTINUE;
|
| 534 |
|
|
|
| 535 |
|
|
fail:
|
| 536 |
|
|
printk(KERN_DEBUG "%s: failed to fragment frame\n", tx->dev->name);
|
| 537 |
|
|
if (frags) {
|
| 538 |
|
|
for (i = 0; i < num_fragm - 1; i++)
|
| 539 |
|
|
if (frags[i])
|
| 540 |
|
|
dev_kfree_skb(frags[i]);
|
| 541 |
|
|
kfree(frags);
|
| 542 |
|
|
}
|
| 543 |
|
|
I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment);
|
| 544 |
|
|
return TXRX_DROP;
|
| 545 |
|
|
}
|
| 546 |
|
|
|
| 547 |
|
|
static ieee80211_txrx_result
|
| 548 |
|
|
ieee80211_tx_h_encrypt(struct ieee80211_txrx_data *tx)
|
| 549 |
|
|
{
|
| 550 |
|
|
if (!tx->key)
|
| 551 |
|
|
return TXRX_CONTINUE;
|
| 552 |
|
|
|
| 553 |
|
|
switch (tx->key->conf.alg) {
|
| 554 |
|
|
case ALG_WEP:
|
| 555 |
|
|
return ieee80211_crypto_wep_encrypt(tx);
|
| 556 |
|
|
case ALG_TKIP:
|
| 557 |
|
|
return ieee80211_crypto_tkip_encrypt(tx);
|
| 558 |
|
|
case ALG_CCMP:
|
| 559 |
|
|
return ieee80211_crypto_ccmp_encrypt(tx);
|
| 560 |
|
|
}
|
| 561 |
|
|
|
| 562 |
|
|
/* not reached */
|
| 563 |
|
|
WARN_ON(1);
|
| 564 |
|
|
return TXRX_DROP;
|
| 565 |
|
|
}
|
| 566 |
|
|
|
| 567 |
|
|
static ieee80211_txrx_result
|
| 568 |
|
|
ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data *tx)
|
| 569 |
|
|
{
|
| 570 |
|
|
struct rate_control_extra extra;
|
| 571 |
|
|
|
| 572 |
|
|
if (likely(!tx->u.tx.rate)) {
|
| 573 |
|
|
memset(&extra, 0, sizeof(extra));
|
| 574 |
|
|
extra.mode = tx->u.tx.mode;
|
| 575 |
|
|
extra.ethertype = tx->ethertype;
|
| 576 |
|
|
|
| 577 |
|
|
tx->u.tx.rate = rate_control_get_rate(tx->local, tx->dev,
|
| 578 |
|
|
tx->skb, &extra);
|
| 579 |
|
|
if (unlikely(extra.probe != NULL)) {
|
| 580 |
|
|
tx->u.tx.control->flags |=
|
| 581 |
|
|
IEEE80211_TXCTL_RATE_CTRL_PROBE;
|
| 582 |
|
|
tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
|
| 583 |
|
|
tx->u.tx.control->alt_retry_rate = tx->u.tx.rate->val;
|
| 584 |
|
|
tx->u.tx.rate = extra.probe;
|
| 585 |
|
|
} else
|
| 586 |
|
|
tx->u.tx.control->alt_retry_rate = -1;
|
| 587 |
|
|
|
| 588 |
|
|
if (!tx->u.tx.rate)
|
| 589 |
|
|
return TXRX_DROP;
|
| 590 |
|
|
} else
|
| 591 |
|
|
tx->u.tx.control->alt_retry_rate = -1;
|
| 592 |
|
|
|
| 593 |
|
|
if (tx->u.tx.mode->mode == MODE_IEEE80211G &&
|
| 594 |
|
|
(tx->sdata->flags & IEEE80211_SDATA_USE_PROTECTION) &&
|
| 595 |
|
|
(tx->flags & IEEE80211_TXRXD_FRAGMENTED) && extra.nonerp) {
|
| 596 |
|
|
tx->u.tx.last_frag_rate = tx->u.tx.rate;
|
| 597 |
|
|
if (extra.probe)
|
| 598 |
|
|
tx->flags &= ~IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
|
| 599 |
|
|
else
|
| 600 |
|
|
tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
|
| 601 |
|
|
tx->u.tx.rate = extra.nonerp;
|
| 602 |
|
|
tx->u.tx.control->rate = extra.nonerp;
|
| 603 |
|
|
tx->u.tx.control->flags &= ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
|
| 604 |
|
|
} else {
|
| 605 |
|
|
tx->u.tx.last_frag_rate = tx->u.tx.rate;
|
| 606 |
|
|
tx->u.tx.control->rate = tx->u.tx.rate;
|
| 607 |
|
|
}
|
| 608 |
|
|
tx->u.tx.control->tx_rate = tx->u.tx.rate->val;
|
| 609 |
|
|
|
| 610 |
|
|
return TXRX_CONTINUE;
|
| 611 |
|
|
}
|
| 612 |
|
|
|
| 613 |
|
|
static ieee80211_txrx_result
|
| 614 |
|
|
ieee80211_tx_h_misc(struct ieee80211_txrx_data *tx)
|
| 615 |
|
|
{
|
| 616 |
|
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
|
| 617 |
|
|
u16 fc = le16_to_cpu(hdr->frame_control);
|
| 618 |
|
|
u16 dur;
|
| 619 |
|
|
struct ieee80211_tx_control *control = tx->u.tx.control;
|
| 620 |
|
|
struct ieee80211_hw_mode *mode = tx->u.tx.mode;
|
| 621 |
|
|
|
| 622 |
|
|
if (!control->retry_limit) {
|
| 623 |
|
|
if (!is_multicast_ether_addr(hdr->addr1)) {
|
| 624 |
|
|
if (tx->skb->len + FCS_LEN > tx->local->rts_threshold
|
| 625 |
|
|
&& tx->local->rts_threshold <
|
| 626 |
|
|
IEEE80211_MAX_RTS_THRESHOLD) {
|
| 627 |
|
|
control->flags |=
|
| 628 |
|
|
IEEE80211_TXCTL_USE_RTS_CTS;
|
| 629 |
|
|
control->flags |=
|
| 630 |
|
|
IEEE80211_TXCTL_LONG_RETRY_LIMIT;
|
| 631 |
|
|
control->retry_limit =
|
| 632 |
|
|
tx->local->long_retry_limit;
|
| 633 |
|
|
} else {
|
| 634 |
|
|
control->retry_limit =
|
| 635 |
|
|
tx->local->short_retry_limit;
|
| 636 |
|
|
}
|
| 637 |
|
|
} else {
|
| 638 |
|
|
control->retry_limit = 1;
|
| 639 |
|
|
}
|
| 640 |
|
|
}
|
| 641 |
|
|
|
| 642 |
|
|
if (tx->flags & IEEE80211_TXRXD_FRAGMENTED) {
|
| 643 |
|
|
/* Do not use multiple retry rates when sending fragmented
|
| 644 |
|
|
* frames.
|
| 645 |
|
|
* TODO: The last fragment could still use multiple retry
|
| 646 |
|
|
* rates. */
|
| 647 |
|
|
control->alt_retry_rate = -1;
|
| 648 |
|
|
}
|
| 649 |
|
|
|
| 650 |
|
|
/* Use CTS protection for unicast frames sent using extended rates if
|
| 651 |
|
|
* there are associated non-ERP stations and RTS/CTS is not configured
|
| 652 |
|
|
* for the frame. */
|
| 653 |
|
|
if (mode->mode == MODE_IEEE80211G &&
|
| 654 |
|
|
(tx->u.tx.rate->flags & IEEE80211_RATE_ERP) &&
|
| 655 |
|
|
(tx->flags & IEEE80211_TXRXD_TXUNICAST) &&
|
| 656 |
|
|
(tx->sdata->flags & IEEE80211_SDATA_USE_PROTECTION) &&
|
| 657 |
|
|
!(control->flags & IEEE80211_TXCTL_USE_RTS_CTS))
|
| 658 |
|
|
control->flags |= IEEE80211_TXCTL_USE_CTS_PROTECT;
|
| 659 |
|
|
|
| 660 |
|
|
/* Transmit data frames using short preambles if the driver supports
|
| 661 |
|
|
* short preambles at the selected rate and short preambles are
|
| 662 |
|
|
* available on the network at the current point in time. */
|
| 663 |
|
|
if (((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
|
| 664 |
|
|
(tx->u.tx.rate->flags & IEEE80211_RATE_PREAMBLE2) &&
|
| 665 |
|
|
(tx->sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE) &&
|
| 666 |
|
|
(!tx->sta || (tx->sta->flags & WLAN_STA_SHORT_PREAMBLE))) {
|
| 667 |
|
|
tx->u.tx.control->tx_rate = tx->u.tx.rate->val2;
|
| 668 |
|
|
}
|
| 669 |
|
|
|
| 670 |
|
|
/* Setup duration field for the first fragment of the frame. Duration
|
| 671 |
|
|
* for remaining fragments will be updated when they are being sent
|
| 672 |
|
|
* to low-level driver in ieee80211_tx(). */
|
| 673 |
|
|
dur = ieee80211_duration(tx, is_multicast_ether_addr(hdr->addr1),
|
| 674 |
|
|
(tx->flags & IEEE80211_TXRXD_FRAGMENTED) ?
|
| 675 |
|
|
tx->u.tx.extra_frag[0]->len : 0);
|
| 676 |
|
|
hdr->duration_id = cpu_to_le16(dur);
|
| 677 |
|
|
|
| 678 |
|
|
if ((control->flags & IEEE80211_TXCTL_USE_RTS_CTS) ||
|
| 679 |
|
|
(control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)) {
|
| 680 |
|
|
struct ieee80211_rate *rate;
|
| 681 |
|
|
|
| 682 |
|
|
/* Do not use multiple retry rates when using RTS/CTS */
|
| 683 |
|
|
control->alt_retry_rate = -1;
|
| 684 |
|
|
|
| 685 |
|
|
/* Use min(data rate, max base rate) as CTS/RTS rate */
|
| 686 |
|
|
rate = tx->u.tx.rate;
|
| 687 |
|
|
while (rate > mode->rates &&
|
| 688 |
|
|
!(rate->flags & IEEE80211_RATE_BASIC))
|
| 689 |
|
|
rate--;
|
| 690 |
|
|
|
| 691 |
|
|
control->rts_cts_rate = rate->val;
|
| 692 |
|
|
control->rts_rate = rate;
|
| 693 |
|
|
}
|
| 694 |
|
|
|
| 695 |
|
|
if (tx->sta) {
|
| 696 |
|
|
tx->sta->tx_packets++;
|
| 697 |
|
|
tx->sta->tx_fragments++;
|
| 698 |
|
|
tx->sta->tx_bytes += tx->skb->len;
|
| 699 |
|
|
if (tx->u.tx.extra_frag) {
|
| 700 |
|
|
int i;
|
| 701 |
|
|
tx->sta->tx_fragments += tx->u.tx.num_extra_frag;
|
| 702 |
|
|
for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
|
| 703 |
|
|
tx->sta->tx_bytes +=
|
| 704 |
|
|
tx->u.tx.extra_frag[i]->len;
|
| 705 |
|
|
}
|
| 706 |
|
|
}
|
| 707 |
|
|
}
|
| 708 |
|
|
|
| 709 |
|
|
/*
|
| 710 |
|
|
* Tell hardware to not encrypt when we had sw crypto.
|
| 711 |
|
|
* Because we use the same flag to internally indicate that
|
| 712 |
|
|
* no (software) encryption should be done, we have to set it
|
| 713 |
|
|
* after all crypto handlers.
|
| 714 |
|
|
*/
|
| 715 |
|
|
if (tx->key && !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
|
| 716 |
|
|
tx->u.tx.control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
|
| 717 |
|
|
|
| 718 |
|
|
return TXRX_CONTINUE;
|
| 719 |
|
|
}
|
| 720 |
|
|
|
| 721 |
|
|
static ieee80211_txrx_result
|
| 722 |
|
|
ieee80211_tx_h_load_stats(struct ieee80211_txrx_data *tx)
|
| 723 |
|
|
{
|
| 724 |
|
|
struct ieee80211_local *local = tx->local;
|
| 725 |
|
|
struct ieee80211_hw_mode *mode = tx->u.tx.mode;
|
| 726 |
|
|
struct sk_buff *skb = tx->skb;
|
| 727 |
|
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
|
| 728 |
|
|
u32 load = 0, hdrtime;
|
| 729 |
|
|
|
| 730 |
|
|
/* TODO: this could be part of tx_status handling, so that the number
|
| 731 |
|
|
* of retries would be known; TX rate should in that case be stored
|
| 732 |
|
|
* somewhere with the packet */
|
| 733 |
|
|
|
| 734 |
|
|
/* Estimate total channel use caused by this frame */
|
| 735 |
|
|
|
| 736 |
|
|
/* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
|
| 737 |
|
|
* 1 usec = 1/8 * (1080 / 10) = 13.5 */
|
| 738 |
|
|
|
| 739 |
|
|
if (mode->mode == MODE_IEEE80211A ||
|
| 740 |
|
|
(mode->mode == MODE_IEEE80211G &&
|
| 741 |
|
|
tx->u.tx.rate->flags & IEEE80211_RATE_ERP))
|
| 742 |
|
|
hdrtime = CHAN_UTIL_HDR_SHORT;
|
| 743 |
|
|
else
|
| 744 |
|
|
hdrtime = CHAN_UTIL_HDR_LONG;
|
| 745 |
|
|
|
| 746 |
|
|
load = hdrtime;
|
| 747 |
|
|
if (!is_multicast_ether_addr(hdr->addr1))
|
| 748 |
|
|
load += hdrtime;
|
| 749 |
|
|
|
| 750 |
|
|
if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_RTS_CTS)
|
| 751 |
|
|
load += 2 * hdrtime;
|
| 752 |
|
|
else if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
|
| 753 |
|
|
load += hdrtime;
|
| 754 |
|
|
|
| 755 |
|
|
load += skb->len * tx->u.tx.rate->rate_inv;
|
| 756 |
|
|
|
| 757 |
|
|
if (tx->u.tx.extra_frag) {
|
| 758 |
|
|
int i;
|
| 759 |
|
|
for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
|
| 760 |
|
|
load += 2 * hdrtime;
|
| 761 |
|
|
load += tx->u.tx.extra_frag[i]->len *
|
| 762 |
|
|
tx->u.tx.rate->rate;
|
| 763 |
|
|
}
|
| 764 |
|
|
}
|
| 765 |
|
|
|
| 766 |
|
|
/* Divide channel_use by 8 to avoid wrapping around the counter */
|
| 767 |
|
|
load >>= CHAN_UTIL_SHIFT;
|
| 768 |
|
|
local->channel_use_raw += load;
|
| 769 |
|
|
if (tx->sta)
|
| 770 |
|
|
tx->sta->channel_use_raw += load;
|
| 771 |
|
|
tx->sdata->channel_use_raw += load;
|
| 772 |
|
|
|
| 773 |
|
|
return TXRX_CONTINUE;
|
| 774 |
|
|
}
|
| 775 |
|
|
|
| 776 |
|
|
/* TODO: implement register/unregister functions for adding TX/RX handlers
|
| 777 |
|
|
* into ordered list */
|
| 778 |
|
|
|
| 779 |
|
|
ieee80211_tx_handler ieee80211_tx_handlers[] =
|
| 780 |
|
|
{
|
| 781 |
|
|
ieee80211_tx_h_check_assoc,
|
| 782 |
|
|
ieee80211_tx_h_sequence,
|
| 783 |
|
|
ieee80211_tx_h_ps_buf,
|
| 784 |
|
|
ieee80211_tx_h_select_key,
|
| 785 |
|
|
ieee80211_tx_h_michael_mic_add,
|
| 786 |
|
|
ieee80211_tx_h_fragment,
|
| 787 |
|
|
ieee80211_tx_h_encrypt,
|
| 788 |
|
|
ieee80211_tx_h_rate_ctrl,
|
| 789 |
|
|
ieee80211_tx_h_misc,
|
| 790 |
|
|
ieee80211_tx_h_load_stats,
|
| 791 |
|
|
NULL
|
| 792 |
|
|
};
|
| 793 |
|
|
|
| 794 |
|
|
/* actual transmit path */
|
| 795 |
|
|
|
| 796 |
|
|
/*
|
| 797 |
|
|
* deal with packet injection down monitor interface
|
| 798 |
|
|
* with Radiotap Header -- only called for monitor mode interface
|
| 799 |
|
|
*/
|
| 800 |
|
|
static ieee80211_txrx_result
|
| 801 |
|
|
__ieee80211_parse_tx_radiotap(struct ieee80211_txrx_data *tx,
|
| 802 |
|
|
struct sk_buff *skb)
|
| 803 |
|
|
{
|
| 804 |
|
|
/*
|
| 805 |
|
|
* this is the moment to interpret and discard the radiotap header that
|
| 806 |
|
|
* must be at the start of the packet injected in Monitor mode
|
| 807 |
|
|
*
|
| 808 |
|
|
* Need to take some care with endian-ness since radiotap
|
| 809 |
|
|
* args are little-endian
|
| 810 |
|
|
*/
|
| 811 |
|
|
|
| 812 |
|
|
struct ieee80211_radiotap_iterator iterator;
|
| 813 |
|
|
struct ieee80211_radiotap_header *rthdr =
|
| 814 |
|
|
(struct ieee80211_radiotap_header *) skb->data;
|
| 815 |
|
|
struct ieee80211_hw_mode *mode = tx->local->hw.conf.mode;
|
| 816 |
|
|
int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
|
| 817 |
|
|
struct ieee80211_tx_control *control = tx->u.tx.control;
|
| 818 |
|
|
|
| 819 |
|
|
control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
|
| 820 |
|
|
tx->flags |= IEEE80211_TXRXD_TX_INJECTED;
|
| 821 |
|
|
tx->flags &= ~IEEE80211_TXRXD_FRAGMENTED;
|
| 822 |
|
|
|
| 823 |
|
|
/*
|
| 824 |
|
|
* for every radiotap entry that is present
|
| 825 |
|
|
* (ieee80211_radiotap_iterator_next returns -ENOENT when no more
|
| 826 |
|
|
* entries present, or -EINVAL on error)
|
| 827 |
|
|
*/
|
| 828 |
|
|
|
| 829 |
|
|
while (!ret) {
|
| 830 |
|
|
int i, target_rate;
|
| 831 |
|
|
|
| 832 |
|
|
ret = ieee80211_radiotap_iterator_next(&iterator);
|
| 833 |
|
|
|
| 834 |
|
|
if (ret)
|
| 835 |
|
|
continue;
|
| 836 |
|
|
|
| 837 |
|
|
/* see if this argument is something we can use */
|
| 838 |
|
|
switch (iterator.this_arg_index) {
|
| 839 |
|
|
/*
|
| 840 |
|
|
* You must take care when dereferencing iterator.this_arg
|
| 841 |
|
|
* for multibyte types... the pointer is not aligned. Use
|
| 842 |
|
|
* get_unaligned((type *)iterator.this_arg) to dereference
|
| 843 |
|
|
* iterator.this_arg for type "type" safely on all arches.
|
| 844 |
|
|
*/
|
| 845 |
|
|
case IEEE80211_RADIOTAP_RATE:
|
| 846 |
|
|
/*
|
| 847 |
|
|
* radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
|
| 848 |
|
|
* ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
|
| 849 |
|
|
*/
|
| 850 |
|
|
target_rate = (*iterator.this_arg) * 5;
|
| 851 |
|
|
for (i = 0; i < mode->num_rates; i++) {
|
| 852 |
|
|
struct ieee80211_rate *r = &mode->rates[i];
|
| 853 |
|
|
|
| 854 |
|
|
if (r->rate == target_rate) {
|
| 855 |
|
|
tx->u.tx.rate = r;
|
| 856 |
|
|
break;
|
| 857 |
|
|
}
|
| 858 |
|
|
}
|
| 859 |
|
|
break;
|
| 860 |
|
|
|
| 861 |
|
|
case IEEE80211_RADIOTAP_ANTENNA:
|
| 862 |
|
|
/*
|
| 863 |
|
|
* radiotap uses 0 for 1st ant, mac80211 is 1 for
|
| 864 |
|
|
* 1st ant
|
| 865 |
|
|
*/
|
| 866 |
|
|
control->antenna_sel_tx = (*iterator.this_arg) + 1;
|
| 867 |
|
|
break;
|
| 868 |
|
|
|
| 869 |
|
|
case IEEE80211_RADIOTAP_DBM_TX_POWER:
|
| 870 |
|
|
control->power_level = *iterator.this_arg;
|
| 871 |
|
|
break;
|
| 872 |
|
|
|
| 873 |
|
|
case IEEE80211_RADIOTAP_FLAGS:
|
| 874 |
|
|
if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
|
| 875 |
|
|
/*
|
| 876 |
|
|
* this indicates that the skb we have been
|
| 877 |
|
|
* handed has the 32-bit FCS CRC at the end...
|
| 878 |
|
|
* we should react to that by snipping it off
|
| 879 |
|
|
* because it will be recomputed and added
|
| 880 |
|
|
* on transmission
|
| 881 |
|
|
*/
|
| 882 |
|
|
if (skb->len < (iterator.max_length + FCS_LEN))
|
| 883 |
|
|
return TXRX_DROP;
|
| 884 |
|
|
|
| 885 |
|
|
skb_trim(skb, skb->len - FCS_LEN);
|
| 886 |
|
|
}
|
| 887 |
|
|
if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
|
| 888 |
|
|
control->flags &=
|
| 889 |
|
|
~IEEE80211_TXCTL_DO_NOT_ENCRYPT;
|
| 890 |
|
|
if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
|
| 891 |
|
|
tx->flags |= IEEE80211_TXRXD_FRAGMENTED;
|
| 892 |
|
|
break;
|
| 893 |
|
|
|
| 894 |
|
|
/*
|
| 895 |
|
|
* Please update the file
|
| 896 |
|
|
* Documentation/networking/mac80211-injection.txt
|
| 897 |
|
|
* when parsing new fields here.
|
| 898 |
|
|
*/
|
| 899 |
|
|
|
| 900 |
|
|
default:
|
| 901 |
|
|
break;
|
| 902 |
|
|
}
|
| 903 |
|
|
}
|
| 904 |
|
|
|
| 905 |
|
|
if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
|
| 906 |
|
|
return TXRX_DROP;
|
| 907 |
|
|
|
| 908 |
|
|
/*
|
| 909 |
|
|
* remove the radiotap header
|
| 910 |
|
|
* iterator->max_length was sanity-checked against
|
| 911 |
|
|
* skb->len by iterator init
|
| 912 |
|
|
*/
|
| 913 |
|
|
skb_pull(skb, iterator.max_length);
|
| 914 |
|
|
|
| 915 |
|
|
return TXRX_CONTINUE;
|
| 916 |
|
|
}
|
| 917 |
|
|
|
| 918 |
|
|
/*
|
| 919 |
|
|
* initialises @tx
|
| 920 |
|
|
*/
|
| 921 |
|
|
static ieee80211_txrx_result
|
| 922 |
|
|
__ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
|
| 923 |
|
|
struct sk_buff *skb,
|
| 924 |
|
|
struct net_device *dev,
|
| 925 |
|
|
struct ieee80211_tx_control *control)
|
| 926 |
|
|
{
|
| 927 |
|
|
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
|
| 928 |
|
|
struct ieee80211_hdr *hdr;
|
| 929 |
|
|
struct ieee80211_sub_if_data *sdata;
|
| 930 |
|
|
ieee80211_txrx_result res = TXRX_CONTINUE;
|
| 931 |
|
|
|
| 932 |
|
|
int hdrlen;
|
| 933 |
|
|
|
| 934 |
|
|
memset(tx, 0, sizeof(*tx));
|
| 935 |
|
|
tx->skb = skb;
|
| 936 |
|
|
tx->dev = dev; /* use original interface */
|
| 937 |
|
|
tx->local = local;
|
| 938 |
|
|
tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
|
| 939 |
|
|
tx->u.tx.control = control;
|
| 940 |
|
|
/*
|
| 941 |
|
|
* Set this flag (used below to indicate "automatic fragmentation"),
|
| 942 |
|
|
* it will be cleared/left by radiotap as desired.
|
| 943 |
|
|
*/
|
| 944 |
|
|
tx->flags |= IEEE80211_TXRXD_FRAGMENTED;
|
| 945 |
|
|
|
| 946 |
|
|
/* process and remove the injection radiotap header */
|
| 947 |
|
|
sdata = IEEE80211_DEV_TO_SUB_IF(dev);
|
| 948 |
|
|
if (unlikely(sdata->type == IEEE80211_IF_TYPE_MNTR)) {
|
| 949 |
|
|
if (__ieee80211_parse_tx_radiotap(tx, skb) == TXRX_DROP)
|
| 950 |
|
|
return TXRX_DROP;
|
| 951 |
|
|
|
| 952 |
|
|
/*
|
| 953 |
|
|
* __ieee80211_parse_tx_radiotap has now removed
|
| 954 |
|
|
* the radiotap header that was present and pre-filled
|
| 955 |
|
|
* 'tx' with tx control information.
|
| 956 |
|
|
*/
|
| 957 |
|
|
}
|
| 958 |
|
|
|
| 959 |
|
|
hdr = (struct ieee80211_hdr *) skb->data;
|
| 960 |
|
|
|
| 961 |
|
|
tx->sta = sta_info_get(local, hdr->addr1);
|
| 962 |
|
|
tx->fc = le16_to_cpu(hdr->frame_control);
|
| 963 |
|
|
|
| 964 |
|
|
if (is_multicast_ether_addr(hdr->addr1)) {
|
| 965 |
|
|
tx->flags &= ~IEEE80211_TXRXD_TXUNICAST;
|
| 966 |
|
|
control->flags |= IEEE80211_TXCTL_NO_ACK;
|
| 967 |
|
|
} else {
|
| 968 |
|
|
tx->flags |= IEEE80211_TXRXD_TXUNICAST;
|
| 969 |
|
|
control->flags &= ~IEEE80211_TXCTL_NO_ACK;
|
| 970 |
|
|
}
|
| 971 |
|
|
|
| 972 |
|
|
if (tx->flags & IEEE80211_TXRXD_FRAGMENTED) {
|
| 973 |
|
|
if ((tx->flags & IEEE80211_TXRXD_TXUNICAST) &&
|
| 974 |
|
|
skb->len + FCS_LEN > local->fragmentation_threshold &&
|
| 975 |
|
|
!local->ops->set_frag_threshold)
|
| 976 |
|
|
tx->flags |= IEEE80211_TXRXD_FRAGMENTED;
|
| 977 |
|
|
else
|
| 978 |
|
|
tx->flags &= ~IEEE80211_TXRXD_FRAGMENTED;
|
| 979 |
|
|
}
|
| 980 |
|
|
|
| 981 |
|
|
if (!tx->sta)
|
| 982 |
|
|
control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
|
| 983 |
|
|
else if (tx->sta->clear_dst_mask) {
|
| 984 |
|
|
control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
|
| 985 |
|
|
tx->sta->clear_dst_mask = 0;
|
| 986 |
|
|
}
|
| 987 |
|
|
|
| 988 |
|
|
hdrlen = ieee80211_get_hdrlen(tx->fc);
|
| 989 |
|
|
if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
|
| 990 |
|
|
u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
|
| 991 |
|
|
tx->ethertype = (pos[0] << 8) | pos[1];
|
| 992 |
|
|
}
|
| 993 |
|
|
control->flags |= IEEE80211_TXCTL_FIRST_FRAGMENT;
|
| 994 |
|
|
|
| 995 |
|
|
return res;
|
| 996 |
|
|
}
|
| 997 |
|
|
|
| 998 |
|
|
/* Device in tx->dev has a reference added; use dev_put(tx->dev) when
|
| 999 |
|
|
* finished with it.
|
| 1000 |
|
|
*
|
| 1001 |
|
|
* NB: @tx is uninitialised when passed in here
|
| 1002 |
|
|
*/
|
| 1003 |
|
|
static int ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
|
| 1004 |
|
|
struct sk_buff *skb,
|
| 1005 |
|
|
struct net_device *mdev,
|
| 1006 |
|
|
struct ieee80211_tx_control *control)
|
| 1007 |
|
|
{
|
| 1008 |
|
|
struct ieee80211_tx_packet_data *pkt_data;
|
| 1009 |
|
|
struct net_device *dev;
|
| 1010 |
|
|
|
| 1011 |
|
|
pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
|
| 1012 |
|
|
dev = dev_get_by_index(&init_net, pkt_data->ifindex);
|
| 1013 |
|
|
if (unlikely(dev && !is_ieee80211_device(dev, mdev))) {
|
| 1014 |
|
|
dev_put(dev);
|
| 1015 |
|
|
dev = NULL;
|
| 1016 |
|
|
}
|
| 1017 |
|
|
if (unlikely(!dev))
|
| 1018 |
|
|
return -ENODEV;
|
| 1019 |
|
|
/* initialises tx with control */
|
| 1020 |
|
|
__ieee80211_tx_prepare(tx, skb, dev, control);
|
| 1021 |
|
|
return 0;
|
| 1022 |
|
|
}
|
| 1023 |
|
|
|
| 1024 |
|
|
static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb,
|
| 1025 |
|
|
struct ieee80211_txrx_data *tx)
|
| 1026 |
|
|
{
|
| 1027 |
|
|
struct ieee80211_tx_control *control = tx->u.tx.control;
|
| 1028 |
|
|
int ret, i;
|
| 1029 |
|
|
|
| 1030 |
|
|
if (!ieee80211_qdisc_installed(local->mdev) &&
|
| 1031 |
|
|
__ieee80211_queue_stopped(local, 0)) {
|
| 1032 |
|
|
netif_stop_queue(local->mdev);
|
| 1033 |
|
|
return IEEE80211_TX_AGAIN;
|
| 1034 |
|
|
}
|
| 1035 |
|
|
if (skb) {
|
| 1036 |
|
|
ieee80211_dump_frame(wiphy_name(local->hw.wiphy),
|
| 1037 |
|
|
"TX to low-level driver", skb);
|
| 1038 |
|
|
ret = local->ops->tx(local_to_hw(local), skb, control);
|
| 1039 |
|
|
if (ret)
|
| 1040 |
|
|
return IEEE80211_TX_AGAIN;
|
| 1041 |
|
|
local->mdev->trans_start = jiffies;
|
| 1042 |
|
|
ieee80211_led_tx(local, 1);
|
| 1043 |
|
|
}
|
| 1044 |
|
|
if (tx->u.tx.extra_frag) {
|
| 1045 |
|
|
control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
|
| 1046 |
|
|
IEEE80211_TXCTL_USE_CTS_PROTECT |
|
| 1047 |
|
|
IEEE80211_TXCTL_CLEAR_DST_MASK |
|
| 1048 |
|
|
IEEE80211_TXCTL_FIRST_FRAGMENT);
|
| 1049 |
|
|
for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
|
| 1050 |
|
|
if (!tx->u.tx.extra_frag[i])
|
| 1051 |
|
|
continue;
|
| 1052 |
|
|
if (__ieee80211_queue_stopped(local, control->queue))
|
| 1053 |
|
|
return IEEE80211_TX_FRAG_AGAIN;
|
| 1054 |
|
|
if (i == tx->u.tx.num_extra_frag) {
|
| 1055 |
|
|
control->tx_rate = tx->u.tx.last_frag_hwrate;
|
| 1056 |
|
|
control->rate = tx->u.tx.last_frag_rate;
|
| 1057 |
|
|
if (tx->flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG)
|
| 1058 |
|
|
control->flags |=
|
| 1059 |
|
|
IEEE80211_TXCTL_RATE_CTRL_PROBE;
|
| 1060 |
|
|
else
|
| 1061 |
|
|
control->flags &=
|
| 1062 |
|
|
~IEEE80211_TXCTL_RATE_CTRL_PROBE;
|
| 1063 |
|
|
}
|
| 1064 |
|
|
|
| 1065 |
|
|
ieee80211_dump_frame(wiphy_name(local->hw.wiphy),
|
| 1066 |
|
|
"TX to low-level driver",
|
| 1067 |
|
|
tx->u.tx.extra_frag[i]);
|
| 1068 |
|
|
ret = local->ops->tx(local_to_hw(local),
|
| 1069 |
|
|
tx->u.tx.extra_frag[i],
|
| 1070 |
|
|
control);
|
| 1071 |
|
|
if (ret)
|
| 1072 |
|
|
return IEEE80211_TX_FRAG_AGAIN;
|
| 1073 |
|
|
local->mdev->trans_start = jiffies;
|
| 1074 |
|
|
ieee80211_led_tx(local, 1);
|
| 1075 |
|
|
tx->u.tx.extra_frag[i] = NULL;
|
| 1076 |
|
|
}
|
| 1077 |
|
|
kfree(tx->u.tx.extra_frag);
|
| 1078 |
|
|
tx->u.tx.extra_frag = NULL;
|
| 1079 |
|
|
}
|
| 1080 |
|
|
return IEEE80211_TX_OK;
|
| 1081 |
|
|
}
|
| 1082 |
|
|
|
| 1083 |
|
|
static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb,
|
| 1084 |
|
|
struct ieee80211_tx_control *control)
|
| 1085 |
|
|
{
|
| 1086 |
|
|
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
|
| 1087 |
|
|
struct sta_info *sta;
|
| 1088 |
|
|
ieee80211_tx_handler *handler;
|
| 1089 |
|
|
struct ieee80211_txrx_data tx;
|
| 1090 |
|
|
ieee80211_txrx_result res = TXRX_DROP, res_prepare;
|
| 1091 |
|
|
int ret, i;
|
| 1092 |
|
|
|
| 1093 |
|
|
WARN_ON(__ieee80211_queue_pending(local, control->queue));
|
| 1094 |
|
|
|
| 1095 |
|
|
if (unlikely(skb->len < 10)) {
|
| 1096 |
|
|
dev_kfree_skb(skb);
|
| 1097 |
|
|
return 0;
|
| 1098 |
|
|
}
|
| 1099 |
|
|
|
| 1100 |
|
|
/* initialises tx */
|
| 1101 |
|
|
res_prepare = __ieee80211_tx_prepare(&tx, skb, dev, control);
|
| 1102 |
|
|
|
| 1103 |
|
|
if (res_prepare == TXRX_DROP) {
|
| 1104 |
|
|
dev_kfree_skb(skb);
|
| 1105 |
|
|
return 0;
|
| 1106 |
|
|
}
|
| 1107 |
|
|
|
| 1108 |
|
|
/*
|
| 1109 |
|
|
* key references are protected using RCU and this requires that
|
| 1110 |
|
|
* we are in a read-site RCU section during receive processing
|
| 1111 |
|
|
*/
|
| 1112 |
|
|
rcu_read_lock();
|
| 1113 |
|
|
|
| 1114 |
|
|
sta = tx.sta;
|
| 1115 |
|
|
tx.u.tx.mode = local->hw.conf.mode;
|
| 1116 |
|
|
|
| 1117 |
|
|
for (handler = local->tx_handlers; *handler != NULL;
|
| 1118 |
|
|
handler++) {
|
| 1119 |
|
|
res = (*handler)(&tx);
|
| 1120 |
|
|
if (res != TXRX_CONTINUE)
|
| 1121 |
|
|
break;
|
| 1122 |
|
|
}
|
| 1123 |
|
|
|
| 1124 |
|
|
skb = tx.skb; /* handlers are allowed to change skb */
|
| 1125 |
|
|
|
| 1126 |
|
|
if (sta)
|
| 1127 |
|
|
sta_info_put(sta);
|
| 1128 |
|
|
|
| 1129 |
|
|
if (unlikely(res == TXRX_DROP)) {
|
| 1130 |
|
|
I802_DEBUG_INC(local->tx_handlers_drop);
|
| 1131 |
|
|
goto drop;
|
| 1132 |
|
|
}
|
| 1133 |
|
|
|
| 1134 |
|
|
if (unlikely(res == TXRX_QUEUED)) {
|
| 1135 |
|
|
I802_DEBUG_INC(local->tx_handlers_queued);
|
| 1136 |
|
|
rcu_read_unlock();
|
| 1137 |
|
|
return 0;
|
| 1138 |
|
|
}
|
| 1139 |
|
|
|
| 1140 |
|
|
if (tx.u.tx.extra_frag) {
|
| 1141 |
|
|
for (i = 0; i < tx.u.tx.num_extra_frag; i++) {
|
| 1142 |
|
|
int next_len, dur;
|
| 1143 |
|
|
struct ieee80211_hdr *hdr =
|
| 1144 |
|
|
(struct ieee80211_hdr *)
|
| 1145 |
|
|
tx.u.tx.extra_frag[i]->data;
|
| 1146 |
|
|
|
| 1147 |
|
|
if (i + 1 < tx.u.tx.num_extra_frag) {
|
| 1148 |
|
|
next_len = tx.u.tx.extra_frag[i + 1]->len;
|
| 1149 |
|
|
} else {
|
| 1150 |
|
|
next_len = 0;
|
| 1151 |
|
|
tx.u.tx.rate = tx.u.tx.last_frag_rate;
|
| 1152 |
|
|
tx.u.tx.last_frag_hwrate = tx.u.tx.rate->val;
|
| 1153 |
|
|
}
|
| 1154 |
|
|
dur = ieee80211_duration(&tx, 0, next_len);
|
| 1155 |
|
|
hdr->duration_id = cpu_to_le16(dur);
|
| 1156 |
|
|
}
|
| 1157 |
|
|
}
|
| 1158 |
|
|
|
| 1159 |
|
|
retry:
|
| 1160 |
|
|
ret = __ieee80211_tx(local, skb, &tx);
|
| 1161 |
|
|
if (ret) {
|
| 1162 |
|
|
struct ieee80211_tx_stored_packet *store =
|
| 1163 |
|
|
&local->pending_packet[control->queue];
|
| 1164 |
|
|
|
| 1165 |
|
|
if (ret == IEEE80211_TX_FRAG_AGAIN)
|
| 1166 |
|
|
skb = NULL;
|
| 1167 |
|
|
set_bit(IEEE80211_LINK_STATE_PENDING,
|
| 1168 |
|
|
&local->state[control->queue]);
|
| 1169 |
|
|
smp_mb();
|
| 1170 |
|
|
/* When the driver gets out of buffers during sending of
|
| 1171 |
|
|
* fragments and calls ieee80211_stop_queue, there is
|
| 1172 |
|
|
* a small window between IEEE80211_LINK_STATE_XOFF and
|
| 1173 |
|
|
* IEEE80211_LINK_STATE_PENDING flags are set. If a buffer
|
| 1174 |
|
|
* gets available in that window (i.e. driver calls
|
| 1175 |
|
|
* ieee80211_wake_queue), we would end up with ieee80211_tx
|
| 1176 |
|
|
* called with IEEE80211_LINK_STATE_PENDING. Prevent this by
|
| 1177 |
|
|
* continuing transmitting here when that situation is
|
| 1178 |
|
|
* possible to have happened. */
|
| 1179 |
|
|
if (!__ieee80211_queue_stopped(local, control->queue)) {
|
| 1180 |
|
|
clear_bit(IEEE80211_LINK_STATE_PENDING,
|
| 1181 |
|
|
&local->state[control->queue]);
|
| 1182 |
|
|
goto retry;
|
| 1183 |
|
|
}
|
| 1184 |
|
|
memcpy(&store->control, control,
|
| 1185 |
|
|
sizeof(struct ieee80211_tx_control));
|
| 1186 |
|
|
store->skb = skb;
|
| 1187 |
|
|
store->extra_frag = tx.u.tx.extra_frag;
|
| 1188 |
|
|
store->num_extra_frag = tx.u.tx.num_extra_frag;
|
| 1189 |
|
|
store->last_frag_hwrate = tx.u.tx.last_frag_hwrate;
|
| 1190 |
|
|
store->last_frag_rate = tx.u.tx.last_frag_rate;
|
| 1191 |
|
|
store->last_frag_rate_ctrl_probe =
|
| 1192 |
|
|
!!(tx.flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG);
|
| 1193 |
|
|
}
|
| 1194 |
|
|
rcu_read_unlock();
|
| 1195 |
|
|
return 0;
|
| 1196 |
|
|
|
| 1197 |
|
|
drop:
|
| 1198 |
|
|
if (skb)
|
| 1199 |
|
|
dev_kfree_skb(skb);
|
| 1200 |
|
|
for (i = 0; i < tx.u.tx.num_extra_frag; i++)
|
| 1201 |
|
|
if (tx.u.tx.extra_frag[i])
|
| 1202 |
|
|
dev_kfree_skb(tx.u.tx.extra_frag[i]);
|
| 1203 |
|
|
kfree(tx.u.tx.extra_frag);
|
| 1204 |
|
|
rcu_read_unlock();
|
| 1205 |
|
|
return 0;
|
| 1206 |
|
|
}
|
| 1207 |
|
|
|
| 1208 |
|
|
/* device xmit handlers */
|
| 1209 |
|
|
|
| 1210 |
|
|
int ieee80211_master_start_xmit(struct sk_buff *skb,
|
| 1211 |
|
|
struct net_device *dev)
|
| 1212 |
|
|
{
|
| 1213 |
|
|
struct ieee80211_tx_control control;
|
| 1214 |
|
|
struct ieee80211_tx_packet_data *pkt_data;
|
| 1215 |
|
|
struct net_device *odev = NULL;
|
| 1216 |
|
|
struct ieee80211_sub_if_data *osdata;
|
| 1217 |
|
|
int headroom;
|
| 1218 |
|
|
int ret;
|
| 1219 |
|
|
|
| 1220 |
|
|
/*
|
| 1221 |
|
|
* copy control out of the skb so other people can use skb->cb
|
| 1222 |
|
|
*/
|
| 1223 |
|
|
pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
|
| 1224 |
|
|
memset(&control, 0, sizeof(struct ieee80211_tx_control));
|
| 1225 |
|
|
|
| 1226 |
|
|
if (pkt_data->ifindex)
|
| 1227 |
|
|
odev = dev_get_by_index(&init_net, pkt_data->ifindex);
|
| 1228 |
|
|
if (unlikely(odev && !is_ieee80211_device(odev, dev))) {
|
| 1229 |
|
|
dev_put(odev);
|
| 1230 |
|
|
odev = NULL;
|
| 1231 |
|
|
}
|
| 1232 |
|
|
if (unlikely(!odev)) {
|
| 1233 |
|
|
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
|
| 1234 |
|
|
printk(KERN_DEBUG "%s: Discarded packet with nonexistent "
|
| 1235 |
|
|
"originating device\n", dev->name);
|
| 1236 |
|
|
#endif
|
| 1237 |
|
|
dev_kfree_skb(skb);
|
| 1238 |
|
|
return 0;
|
| 1239 |
|
|
}
|
| 1240 |
|
|
osdata = IEEE80211_DEV_TO_SUB_IF(odev);
|
| 1241 |
|
|
|
| 1242 |
|
|
headroom = osdata->local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM;
|
| 1243 |
|
|
if (skb_headroom(skb) < headroom) {
|
| 1244 |
|
|
if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
|
| 1245 |
|
|
dev_kfree_skb(skb);
|
| 1246 |
|
|
dev_put(odev);
|
| 1247 |
|
|
return 0;
|
| 1248 |
|
|
}
|
| 1249 |
|
|
}
|
| 1250 |
|
|
|
| 1251 |
|
|
control.ifindex = odev->ifindex;
|
| 1252 |
|
|
control.type = osdata->type;
|
| 1253 |
|
|
if (pkt_data->flags & IEEE80211_TXPD_REQ_TX_STATUS)
|
| 1254 |
|
|
control.flags |= IEEE80211_TXCTL_REQ_TX_STATUS;
|
| 1255 |
|
|
if (pkt_data->flags & IEEE80211_TXPD_DO_NOT_ENCRYPT)
|
| 1256 |
|
|
control.flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
|
| 1257 |
|
|
if (pkt_data->flags & IEEE80211_TXPD_REQUEUE)
|
| 1258 |
|
|
control.flags |= IEEE80211_TXCTL_REQUEUE;
|
| 1259 |
|
|
control.queue = pkt_data->queue;
|
| 1260 |
|
|
|
| 1261 |
|
|
ret = ieee80211_tx(odev, skb, &control);
|
| 1262 |
|
|
dev_put(odev);
|
| 1263 |
|
|
|
| 1264 |
|
|
return ret;
|
| 1265 |
|
|
}
|
| 1266 |
|
|
|
| 1267 |
|
|
int ieee80211_monitor_start_xmit(struct sk_buff *skb,
|
| 1268 |
|
|
struct net_device *dev)
|
| 1269 |
|
|
{
|
| 1270 |
|
|
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
|
| 1271 |
|
|
struct ieee80211_tx_packet_data *pkt_data;
|
| 1272 |
|
|
struct ieee80211_radiotap_header *prthdr =
|
| 1273 |
|
|
(struct ieee80211_radiotap_header *)skb->data;
|
| 1274 |
|
|
u16 len_rthdr;
|
| 1275 |
|
|
|
| 1276 |
|
|
/* check for not even having the fixed radiotap header part */
|
| 1277 |
|
|
if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
|
| 1278 |
|
|
goto fail; /* too short to be possibly valid */
|
| 1279 |
|
|
|
| 1280 |
|
|
/* is it a header version we can trust to find length from? */
|
| 1281 |
|
|
if (unlikely(prthdr->it_version))
|
| 1282 |
|
|
goto fail; /* only version 0 is supported */
|
| 1283 |
|
|
|
| 1284 |
|
|
/* then there must be a radiotap header with a length we can use */
|
| 1285 |
|
|
len_rthdr = ieee80211_get_radiotap_len(skb->data);
|
| 1286 |
|
|
|
| 1287 |
|
|
/* does the skb contain enough to deliver on the alleged length? */
|
| 1288 |
|
|
if (unlikely(skb->len < len_rthdr))
|
| 1289 |
|
|
goto fail; /* skb too short for claimed rt header extent */
|
| 1290 |
|
|
|
| 1291 |
|
|
skb->dev = local->mdev;
|
| 1292 |
|
|
|
| 1293 |
|
|
pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
|
| 1294 |
|
|
memset(pkt_data, 0, sizeof(*pkt_data));
|
| 1295 |
|
|
/* needed because we set skb device to master */
|
| 1296 |
|
|
pkt_data->ifindex = dev->ifindex;
|
| 1297 |
|
|
|
| 1298 |
|
|
pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
|
| 1299 |
|
|
|
| 1300 |
|
|
/*
|
| 1301 |
|
|
* fix up the pointers accounting for the radiotap
|
| 1302 |
|
|
* header still being in there. We are being given
|
| 1303 |
|
|
* a precooked IEEE80211 header so no need for
|
| 1304 |
|
|
* normal processing
|
| 1305 |
|
|
*/
|
| 1306 |
|
|
skb_set_mac_header(skb, len_rthdr);
|
| 1307 |
|
|
/*
|
| 1308 |
|
|
* these are just fixed to the end of the rt area since we
|
| 1309 |
|
|
* don't have any better information and at this point, nobody cares
|
| 1310 |
|
|
*/
|
| 1311 |
|
|
skb_set_network_header(skb, len_rthdr);
|
| 1312 |
|
|
skb_set_transport_header(skb, len_rthdr);
|
| 1313 |
|
|
|
| 1314 |
|
|
/* pass the radiotap header up to the next stage intact */
|
| 1315 |
|
|
dev_queue_xmit(skb);
|
| 1316 |
|
|
return NETDEV_TX_OK;
|
| 1317 |
|
|
|
| 1318 |
|
|
fail:
|
| 1319 |
|
|
dev_kfree_skb(skb);
|
| 1320 |
|
|
return NETDEV_TX_OK; /* meaning, we dealt with the skb */
|
| 1321 |
|
|
}
|
| 1322 |
|
|
|
| 1323 |
|
|
/**
|
| 1324 |
|
|
* ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
|
| 1325 |
|
|
* subinterfaces (wlan#, WDS, and VLAN interfaces)
|
| 1326 |
|
|
* @skb: packet to be sent
|
| 1327 |
|
|
* @dev: incoming interface
|
| 1328 |
|
|
*
|
| 1329 |
|
|
* Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
|
| 1330 |
|
|
* not be freed, and caller is responsible for either retrying later or freeing
|
| 1331 |
|
|
* skb).
|
| 1332 |
|
|
*
|
| 1333 |
|
|
* This function takes in an Ethernet header and encapsulates it with suitable
|
| 1334 |
|
|
* IEEE 802.11 header based on which interface the packet is coming in. The
|
| 1335 |
|
|
* encapsulated packet will then be passed to master interface, wlan#.11, for
|
| 1336 |
|
|
* transmission (through low-level driver).
|
| 1337 |
|
|
*/
|
| 1338 |
|
|
int ieee80211_subif_start_xmit(struct sk_buff *skb,
|
| 1339 |
|
|
struct net_device *dev)
|
| 1340 |
|
|
{
|
| 1341 |
|
|
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
|
| 1342 |
|
|
struct ieee80211_tx_packet_data *pkt_data;
|
| 1343 |
|
|
struct ieee80211_sub_if_data *sdata;
|
| 1344 |
|
|
int ret = 1, head_need;
|
| 1345 |
|
|
u16 ethertype, hdrlen, fc;
|
| 1346 |
|
|
struct ieee80211_hdr hdr;
|
| 1347 |
|
|
const u8 *encaps_data;
|
| 1348 |
|
|
int encaps_len, skip_header_bytes;
|
| 1349 |
|
|
int nh_pos, h_pos;
|
| 1350 |
|
|
struct sta_info *sta;
|
| 1351 |
|
|
|
| 1352 |
|
|
sdata = IEEE80211_DEV_TO_SUB_IF(dev);
|
| 1353 |
|
|
if (unlikely(skb->len < ETH_HLEN)) {
|
| 1354 |
|
|
printk(KERN_DEBUG "%s: short skb (len=%d)\n",
|
| 1355 |
|
|
dev->name, skb->len);
|
| 1356 |
|
|
ret = 0;
|
| 1357 |
|
|
goto fail;
|
| 1358 |
|
|
}
|
| 1359 |
|
|
|
| 1360 |
|
|
nh_pos = skb_network_header(skb) - skb->data;
|
| 1361 |
|
|
h_pos = skb_transport_header(skb) - skb->data;
|
| 1362 |
|
|
|
| 1363 |
|
|
/* convert Ethernet header to proper 802.11 header (based on
|
| 1364 |
|
|
* operation mode) */
|
| 1365 |
|
|
ethertype = (skb->data[12] << 8) | skb->data[13];
|
| 1366 |
|
|
/* TODO: handling for 802.1x authorized/unauthorized port */
|
| 1367 |
|
|
fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA;
|
| 1368 |
|
|
|
| 1369 |
|
|
switch (sdata->type) {
|
| 1370 |
|
|
case IEEE80211_IF_TYPE_AP:
|
| 1371 |
|
|
case IEEE80211_IF_TYPE_VLAN:
|
| 1372 |
|
|
fc |= IEEE80211_FCTL_FROMDS;
|
| 1373 |
|
|
/* DA BSSID SA */
|
| 1374 |
|
|
memcpy(hdr.addr1, skb->data, ETH_ALEN);
|
| 1375 |
|
|
memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
|
| 1376 |
|
|
memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
|
| 1377 |
|
|
hdrlen = 24;
|
| 1378 |
|
|
break;
|
| 1379 |
|
|
case IEEE80211_IF_TYPE_WDS:
|
| 1380 |
|
|
fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS;
|
| 1381 |
|
|
/* RA TA DA SA */
|
| 1382 |
|
|
memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
|
| 1383 |
|
|
memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
|
| 1384 |
|
|
memcpy(hdr.addr3, skb->data, ETH_ALEN);
|
| 1385 |
|
|
memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
|
| 1386 |
|
|
hdrlen = 30;
|
| 1387 |
|
|
break;
|
| 1388 |
|
|
case IEEE80211_IF_TYPE_STA:
|
| 1389 |
|
|
fc |= IEEE80211_FCTL_TODS;
|
| 1390 |
|
|
/* BSSID SA DA */
|
| 1391 |
|
|
memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN);
|
| 1392 |
|
|
memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
|
| 1393 |
|
|
memcpy(hdr.addr3, skb->data, ETH_ALEN);
|
| 1394 |
|
|
hdrlen = 24;
|
| 1395 |
|
|
break;
|
| 1396 |
|
|
case IEEE80211_IF_TYPE_IBSS:
|
| 1397 |
|
|
/* DA SA BSSID */
|
| 1398 |
|
|
memcpy(hdr.addr1, skb->data, ETH_ALEN);
|
| 1399 |
|
|
memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
|
| 1400 |
|
|
memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN);
|
| 1401 |
|
|
hdrlen = 24;
|
| 1402 |
|
|
break;
|
| 1403 |
|
|
default:
|
| 1404 |
|
|
ret = 0;
|
| 1405 |
|
|
goto fail;
|
| 1406 |
|
|
}
|
| 1407 |
|
|
|
| 1408 |
|
|
/* receiver is QoS enabled, use a QoS type frame */
|
| 1409 |
|
|
sta = sta_info_get(local, hdr.addr1);
|
| 1410 |
|
|
if (sta) {
|
| 1411 |
|
|
if (sta->flags & WLAN_STA_WME) {
|
| 1412 |
|
|
fc |= IEEE80211_STYPE_QOS_DATA;
|
| 1413 |
|
|
hdrlen += 2;
|
| 1414 |
|
|
}
|
| 1415 |
|
|
sta_info_put(sta);
|
| 1416 |
|
|
}
|
| 1417 |
|
|
|
| 1418 |
|
|
hdr.frame_control = cpu_to_le16(fc);
|
| 1419 |
|
|
hdr.duration_id = 0;
|
| 1420 |
|
|
hdr.seq_ctrl = 0;
|
| 1421 |
|
|
|
| 1422 |
|
|
skip_header_bytes = ETH_HLEN;
|
| 1423 |
|
|
if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
|
| 1424 |
|
|
encaps_data = bridge_tunnel_header;
|
| 1425 |
|
|
encaps_len = sizeof(bridge_tunnel_header);
|
| 1426 |
|
|
skip_header_bytes -= 2;
|
| 1427 |
|
|
} else if (ethertype >= 0x600) {
|
| 1428 |
|
|
encaps_data = rfc1042_header;
|
| 1429 |
|
|
encaps_len = sizeof(rfc1042_header);
|
| 1430 |
|
|
skip_header_bytes -= 2;
|
| 1431 |
|
|
} else {
|
| 1432 |
|
|
encaps_data = NULL;
|
| 1433 |
|
|
encaps_len = 0;
|
| 1434 |
|
|
}
|
| 1435 |
|
|
|
| 1436 |
|
|
skb_pull(skb, skip_header_bytes);
|
| 1437 |
|
|
nh_pos -= skip_header_bytes;
|
| 1438 |
|
|
h_pos -= skip_header_bytes;
|
| 1439 |
|
|
|
| 1440 |
|
|
/* TODO: implement support for fragments so that there is no need to
|
| 1441 |
|
|
* reallocate and copy payload; it might be enough to support one
|
| 1442 |
|
|
* extra fragment that would be copied in the beginning of the frame
|
| 1443 |
|
|
* data.. anyway, it would be nice to include this into skb structure
|
| 1444 |
|
|
* somehow
|
| 1445 |
|
|
*
|
| 1446 |
|
|
* There are few options for this:
|
| 1447 |
|
|
* use skb->cb as an extra space for 802.11 header
|
| 1448 |
|
|
* allocate new buffer if not enough headroom
|
| 1449 |
|
|
* make sure that there is enough headroom in every skb by increasing
|
| 1450 |
|
|
* build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
|
| 1451 |
|
|
* alloc_skb() (net/core/skbuff.c)
|
| 1452 |
|
|
*/
|
| 1453 |
|
|
head_need = hdrlen + encaps_len + local->tx_headroom;
|
| 1454 |
|
|
head_need -= skb_headroom(skb);
|
| 1455 |
|
|
|
| 1456 |
|
|
/* We are going to modify skb data, so make a copy of it if happens to
|
| 1457 |
|
|
* be cloned. This could happen, e.g., with Linux bridge code passing
|
| 1458 |
|
|
* us broadcast frames. */
|
| 1459 |
|
|
|
| 1460 |
|
|
if (head_need > 0 || skb_cloned(skb)) {
|
| 1461 |
|
|
#if 0
|
| 1462 |
|
|
printk(KERN_DEBUG "%s: need to reallocate buffer for %d bytes "
|
| 1463 |
|
|
"of headroom\n", dev->name, head_need);
|
| 1464 |
|
|
#endif
|
| 1465 |
|
|
|
| 1466 |
|
|
if (skb_cloned(skb))
|
| 1467 |
|
|
I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
|
| 1468 |
|
|
else
|
| 1469 |
|
|
I802_DEBUG_INC(local->tx_expand_skb_head);
|
| 1470 |
|
|
/* Since we have to reallocate the buffer, make sure that there
|
| 1471 |
|
|
* is enough room for possible WEP IV/ICV and TKIP (8 bytes
|
| 1472 |
|
|
* before payload and 12 after). */
|
| 1473 |
|
|
if (pskb_expand_head(skb, (head_need > 0 ? head_need + 8 : 8),
|
| 1474 |
|
|
12, GFP_ATOMIC)) {
|
| 1475 |
|
|
printk(KERN_DEBUG "%s: failed to reallocate TX buffer"
|
| 1476 |
|
|
"\n", dev->name);
|
| 1477 |
|
|
goto fail;
|
| 1478 |
|
|
}
|
| 1479 |
|
|
}
|
| 1480 |
|
|
|
| 1481 |
|
|
if (encaps_data) {
|
| 1482 |
|
|
memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
|
| 1483 |
|
|
nh_pos += encaps_len;
|
| 1484 |
|
|
h_pos += encaps_len;
|
| 1485 |
|
|
}
|
| 1486 |
|
|
|
| 1487 |
|
|
if (fc & IEEE80211_STYPE_QOS_DATA) {
|
| 1488 |
|
|
__le16 *qos_control;
|
| 1489 |
|
|
|
| 1490 |
|
|
qos_control = (__le16*) skb_push(skb, 2);
|
| 1491 |
|
|
memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
|
| 1492 |
|
|
/*
|
| 1493 |
|
|
* Maybe we could actually set some fields here, for now just
|
| 1494 |
|
|
* initialise to zero to indicate no special operation.
|
| 1495 |
|
|
*/
|
| 1496 |
|
|
*qos_control = 0;
|
| 1497 |
|
|
} else
|
| 1498 |
|
|
memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
|
| 1499 |
|
|
|
| 1500 |
|
|
nh_pos += hdrlen;
|
| 1501 |
|
|
h_pos += hdrlen;
|
| 1502 |
|
|
|
| 1503 |
|
|
pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
|
| 1504 |
|
|
memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
|
| 1505 |
|
|
pkt_data->ifindex = dev->ifindex;
|
| 1506 |
|
|
|
| 1507 |
|
|
skb->dev = local->mdev;
|
| 1508 |
|
|
dev->stats.tx_packets++;
|
| 1509 |
|
|
dev->stats.tx_bytes += skb->len;
|
| 1510 |
|
|
|
| 1511 |
|
|
/* Update skb pointers to various headers since this modified frame
|
| 1512 |
|
|
* is going to go through Linux networking code that may potentially
|
| 1513 |
|
|
* need things like pointer to IP header. */
|
| 1514 |
|
|
skb_set_mac_header(skb, 0);
|
| 1515 |
|
|
skb_set_network_header(skb, nh_pos);
|
| 1516 |
|
|
skb_set_transport_header(skb, h_pos);
|
| 1517 |
|
|
|
| 1518 |
|
|
dev->trans_start = jiffies;
|
| 1519 |
|
|
dev_queue_xmit(skb);
|
| 1520 |
|
|
|
| 1521 |
|
|
return 0;
|
| 1522 |
|
|
|
| 1523 |
|
|
fail:
|
| 1524 |
|
|
if (!ret)
|
| 1525 |
|
|
dev_kfree_skb(skb);
|
| 1526 |
|
|
|
| 1527 |
|
|
return ret;
|
| 1528 |
|
|
}
|
| 1529 |
|
|
|
| 1530 |
|
|
/*
|
| 1531 |
|
|
* This is the transmit routine for the 802.11 type interfaces
|
| 1532 |
|
|
* called by upper layers of the linux networking
|
| 1533 |
|
|
* stack when it has a frame to transmit
|
| 1534 |
|
|
*/
|
| 1535 |
|
|
int ieee80211_mgmt_start_xmit(struct sk_buff *skb, struct net_device *dev)
|
| 1536 |
|
|
{
|
| 1537 |
|
|
struct ieee80211_sub_if_data *sdata;
|
| 1538 |
|
|
struct ieee80211_tx_packet_data *pkt_data;
|
| 1539 |
|
|
struct ieee80211_hdr *hdr;
|
| 1540 |
|
|
u16 fc;
|
| 1541 |
|
|
|
| 1542 |
|
|
sdata = IEEE80211_DEV_TO_SUB_IF(dev);
|
| 1543 |
|
|
|
| 1544 |
|
|
if (skb->len < 10) {
|
| 1545 |
|
|
dev_kfree_skb(skb);
|
| 1546 |
|
|
return 0;
|
| 1547 |
|
|
}
|
| 1548 |
|
|
|
| 1549 |
|
|
if (skb_headroom(skb) < sdata->local->tx_headroom) {
|
| 1550 |
|
|
if (pskb_expand_head(skb, sdata->local->tx_headroom,
|
| 1551 |
|
|
0, GFP_ATOMIC)) {
|
| 1552 |
|
|
dev_kfree_skb(skb);
|
| 1553 |
|
|
return 0;
|
| 1554 |
|
|
}
|
| 1555 |
|
|
}
|
| 1556 |
|
|
|
| 1557 |
|
|
hdr = (struct ieee80211_hdr *) skb->data;
|
| 1558 |
|
|
fc = le16_to_cpu(hdr->frame_control);
|
| 1559 |
|
|
|
| 1560 |
|
|
pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
|
| 1561 |
|
|
memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
|
| 1562 |
|
|
pkt_data->ifindex = sdata->dev->ifindex;
|
| 1563 |
|
|
|
| 1564 |
|
|
skb->priority = 20; /* use hardcoded priority for mgmt TX queue */
|
| 1565 |
|
|
skb->dev = sdata->local->mdev;
|
| 1566 |
|
|
|
| 1567 |
|
|
/*
|
| 1568 |
|
|
* We're using the protocol field of the the frame control header
|
| 1569 |
|
|
* to request TX callback for hostapd. BIT(1) is checked.
|
| 1570 |
|
|
*/
|
| 1571 |
|
|
if ((fc & BIT(1)) == BIT(1)) {
|
| 1572 |
|
|
pkt_data->flags |= IEEE80211_TXPD_REQ_TX_STATUS;
|
| 1573 |
|
|
fc &= ~BIT(1);
|
| 1574 |
|
|
hdr->frame_control = cpu_to_le16(fc);
|
| 1575 |
|
|
}
|
| 1576 |
|
|
|
| 1577 |
|
|
if (!(fc & IEEE80211_FCTL_PROTECTED))
|
| 1578 |
|
|
pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
|
| 1579 |
|
|
|
| 1580 |
|
|
dev->stats.tx_packets++;
|
| 1581 |
|
|
dev->stats.tx_bytes += skb->len;
|
| 1582 |
|
|
|
| 1583 |
|
|
dev_queue_xmit(skb);
|
| 1584 |
|
|
|
| 1585 |
|
|
return 0;
|
| 1586 |
|
|
}
|
| 1587 |
|
|
|
| 1588 |
|
|
/* helper functions for pending packets for when queues are stopped */
|
| 1589 |
|
|
|
| 1590 |
|
|
void ieee80211_clear_tx_pending(struct ieee80211_local *local)
|
| 1591 |
|
|
{
|
| 1592 |
|
|
int i, j;
|
| 1593 |
|
|
struct ieee80211_tx_stored_packet *store;
|
| 1594 |
|
|
|
| 1595 |
|
|
for (i = 0; i < local->hw.queues; i++) {
|
| 1596 |
|
|
if (!__ieee80211_queue_pending(local, i))
|
| 1597 |
|
|
continue;
|
| 1598 |
|
|
store = &local->pending_packet[i];
|
| 1599 |
|
|
kfree_skb(store->skb);
|
| 1600 |
|
|
for (j = 0; j < store->num_extra_frag; j++)
|
| 1601 |
|
|
kfree_skb(store->extra_frag[j]);
|
| 1602 |
|
|
kfree(store->extra_frag);
|
| 1603 |
|
|
clear_bit(IEEE80211_LINK_STATE_PENDING, &local->state[i]);
|
| 1604 |
|
|
}
|
| 1605 |
|
|
}
|
| 1606 |
|
|
|
| 1607 |
|
|
void ieee80211_tx_pending(unsigned long data)
|
| 1608 |
|
|
{
|
| 1609 |
|
|
struct ieee80211_local *local = (struct ieee80211_local *)data;
|
| 1610 |
|
|
struct net_device *dev = local->mdev;
|
| 1611 |
|
|
struct ieee80211_tx_stored_packet *store;
|
| 1612 |
|
|
struct ieee80211_txrx_data tx;
|
| 1613 |
|
|
int i, ret, reschedule = 0;
|
| 1614 |
|
|
|
| 1615 |
|
|
netif_tx_lock_bh(dev);
|
| 1616 |
|
|
for (i = 0; i < local->hw.queues; i++) {
|
| 1617 |
|
|
if (__ieee80211_queue_stopped(local, i))
|
| 1618 |
|
|
continue;
|
| 1619 |
|
|
if (!__ieee80211_queue_pending(local, i)) {
|
| 1620 |
|
|
reschedule = 1;
|
| 1621 |
|
|
continue;
|
| 1622 |
|
|
}
|
| 1623 |
|
|
store = &local->pending_packet[i];
|
| 1624 |
|
|
tx.u.tx.control = &store->control;
|
| 1625 |
|
|
tx.u.tx.extra_frag = store->extra_frag;
|
| 1626 |
|
|
tx.u.tx.num_extra_frag = store->num_extra_frag;
|
| 1627 |
|
|
tx.u.tx.last_frag_hwrate = store->last_frag_hwrate;
|
| 1628 |
|
|
tx.u.tx.last_frag_rate = store->last_frag_rate;
|
| 1629 |
|
|
tx.flags = 0;
|
| 1630 |
|
|
if (store->last_frag_rate_ctrl_probe)
|
| 1631 |
|
|
tx.flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
|
| 1632 |
|
|
ret = __ieee80211_tx(local, store->skb, &tx);
|
| 1633 |
|
|
if (ret) {
|
| 1634 |
|
|
if (ret == IEEE80211_TX_FRAG_AGAIN)
|
| 1635 |
|
|
store->skb = NULL;
|
| 1636 |
|
|
} else {
|
| 1637 |
|
|
clear_bit(IEEE80211_LINK_STATE_PENDING,
|
| 1638 |
|
|
&local->state[i]);
|
| 1639 |
|
|
reschedule = 1;
|
| 1640 |
|
|
}
|
| 1641 |
|
|
}
|
| 1642 |
|
|
netif_tx_unlock_bh(dev);
|
| 1643 |
|
|
if (reschedule) {
|
| 1644 |
|
|
if (!ieee80211_qdisc_installed(dev)) {
|
| 1645 |
|
|
if (!__ieee80211_queue_stopped(local, 0))
|
| 1646 |
|
|
netif_wake_queue(dev);
|
| 1647 |
|
|
} else
|
| 1648 |
|
|
netif_schedule(dev);
|
| 1649 |
|
|
}
|
| 1650 |
|
|
}
|
| 1651 |
|
|
|
| 1652 |
|
|
/* functions for drivers to get certain frames */
|
| 1653 |
|
|
|
| 1654 |
|
|
static void ieee80211_beacon_add_tim(struct ieee80211_local *local,
|
| 1655 |
|
|
struct ieee80211_if_ap *bss,
|
| 1656 |
|
|
struct sk_buff *skb)
|
| 1657 |
|
|
{
|
| 1658 |
|
|
u8 *pos, *tim;
|
| 1659 |
|
|
int aid0 = 0;
|
| 1660 |
|
|
int i, have_bits = 0, n1, n2;
|
| 1661 |
|
|
|
| 1662 |
|
|
/* Generate bitmap for TIM only if there are any STAs in power save
|
| 1663 |
|
|
* mode. */
|
| 1664 |
|
|
read_lock_bh(&local->sta_lock);
|
| 1665 |
|
|
if (atomic_read(&bss->num_sta_ps) > 0)
|
| 1666 |
|
|
/* in the hope that this is faster than
|
| 1667 |
|
|
* checking byte-for-byte */
|
| 1668 |
|
|
have_bits = !bitmap_empty((unsigned long*)bss->tim,
|
| 1669 |
|
|
IEEE80211_MAX_AID+1);
|
| 1670 |
|
|
|
| 1671 |
|
|
if (bss->dtim_count == 0)
|
| 1672 |
|
|
bss->dtim_count = bss->dtim_period - 1;
|
| 1673 |
|
|
else
|
| 1674 |
|
|
bss->dtim_count--;
|
| 1675 |
|
|
|
| 1676 |
|
|
tim = pos = (u8 *) skb_put(skb, 6);
|
| 1677 |
|
|
*pos++ = WLAN_EID_TIM;
|
| 1678 |
|
|
*pos++ = 4;
|
| 1679 |
|
|
*pos++ = bss->dtim_count;
|
| 1680 |
|
|
*pos++ = bss->dtim_period;
|
| 1681 |
|
|
|
| 1682 |
|
|
if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
|
| 1683 |
|
|
aid0 = 1;
|
| 1684 |
|
|
|
| 1685 |
|
|
if (have_bits) {
|
| 1686 |
|
|
/* Find largest even number N1 so that bits numbered 1 through
|
| 1687 |
|
|
* (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
|
| 1688 |
|
|
* (N2 + 1) x 8 through 2007 are 0. */
|
| 1689 |
|
|
n1 = 0;
|
| 1690 |
|
|
for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
|
| 1691 |
|
|
if (bss->tim[i]) {
|
| 1692 |
|
|
n1 = i & 0xfe;
|
| 1693 |
|
|
break;
|
| 1694 |
|
|
}
|
| 1695 |
|
|
}
|
| 1696 |
|
|
n2 = n1;
|
| 1697 |
|
|
for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
|
| 1698 |
|
|
if (bss->tim[i]) {
|
| 1699 |
|
|
n2 = i;
|
| 1700 |
|
|
break;
|
| 1701 |
|
|
}
|
| 1702 |
|
|
}
|
| 1703 |
|
|
|
| 1704 |
|
|
/* Bitmap control */
|
| 1705 |
|
|
*pos++ = n1 | aid0;
|
| 1706 |
|
|
/* Part Virt Bitmap */
|
| 1707 |
|
|
memcpy(pos, bss->tim + n1, n2 - n1 + 1);
|
| 1708 |
|
|
|
| 1709 |
|
|
tim[1] = n2 - n1 + 4;
|
| 1710 |
|
|
skb_put(skb, n2 - n1);
|
| 1711 |
|
|
} else {
|
| 1712 |
|
|
*pos++ = aid0; /* Bitmap control */
|
| 1713 |
|
|
*pos++ = 0; /* Part Virt Bitmap */
|
| 1714 |
|
|
}
|
| 1715 |
|
|
read_unlock_bh(&local->sta_lock);
|
| 1716 |
|
|
}
|
| 1717 |
|
|
|
| 1718 |
|
|
struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw, int if_id,
|
| 1719 |
|
|
struct ieee80211_tx_control *control)
|
| 1720 |
|
|
{
|
| 1721 |
|
|
struct ieee80211_local *local = hw_to_local(hw);
|
| 1722 |
|
|
struct sk_buff *skb;
|
| 1723 |
|
|
struct net_device *bdev;
|
| 1724 |
|
|
struct ieee80211_sub_if_data *sdata = NULL;
|
| 1725 |
|
|
struct ieee80211_if_ap *ap = NULL;
|
| 1726 |
|
|
struct ieee80211_rate *rate;
|
| 1727 |
|
|
struct rate_control_extra extra;
|
| 1728 |
|
|
u8 *b_head, *b_tail;
|
| 1729 |
|
|
int bh_len, bt_len;
|
| 1730 |
|
|
|
| 1731 |
|
|
bdev = dev_get_by_index(&init_net, if_id);
|
| 1732 |
|
|
if (bdev) {
|
| 1733 |
|
|
sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
|
| 1734 |
|
|
ap = &sdata->u.ap;
|
| 1735 |
|
|
dev_put(bdev);
|
| 1736 |
|
|
}
|
| 1737 |
|
|
|
| 1738 |
|
|
if (!ap || sdata->type != IEEE80211_IF_TYPE_AP ||
|
| 1739 |
|
|
!ap->beacon_head) {
|
| 1740 |
|
|
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
|
| 1741 |
|
|
if (net_ratelimit())
|
| 1742 |
|
|
printk(KERN_DEBUG "no beacon data avail for idx=%d "
|
| 1743 |
|
|
"(%s)\n", if_id, bdev ? bdev->name : "N/A");
|
| 1744 |
|
|
#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
|
| 1745 |
|
|
return NULL;
|
| 1746 |
|
|
}
|
| 1747 |
|
|
|
| 1748 |
|
|
/* Assume we are generating the normal beacon locally */
|
| 1749 |
|
|
b_head = ap->beacon_head;
|
| 1750 |
|
|
b_tail = ap->beacon_tail;
|
| 1751 |
|
|
bh_len = ap->beacon_head_len;
|
| 1752 |
|
|
bt_len = ap->beacon_tail_len;
|
| 1753 |
|
|
|
| 1754 |
|
|
skb = dev_alloc_skb(local->tx_headroom +
|
| 1755 |
|
|
bh_len + bt_len + 256 /* maximum TIM len */);
|
| 1756 |
|
|
if (!skb)
|
| 1757 |
|
|
return NULL;
|
| 1758 |
|
|
|
| 1759 |
|
|
skb_reserve(skb, local->tx_headroom);
|
| 1760 |
|
|
memcpy(skb_put(skb, bh_len), b_head, bh_len);
|
| 1761 |
|
|
|
| 1762 |
|
|
ieee80211_include_sequence(sdata, (struct ieee80211_hdr *)skb->data);
|
| 1763 |
|
|
|
| 1764 |
|
|
ieee80211_beacon_add_tim(local, ap, skb);
|
| 1765 |
|
|
|
| 1766 |
|
|
if (b_tail) {
|
| 1767 |
|
|
memcpy(skb_put(skb, bt_len), b_tail, bt_len);
|
| 1768 |
|
|
}
|
| 1769 |
|
|
|
| 1770 |
|
|
if (control) {
|
| 1771 |
|
|
memset(&extra, 0, sizeof(extra));
|
| 1772 |
|
|
extra.mode = local->oper_hw_mode;
|
| 1773 |
|
|
|
| 1774 |
|
|
rate = rate_control_get_rate(local, local->mdev, skb, &extra);
|
| 1775 |
|
|
if (!rate) {
|
| 1776 |
|
|
if (net_ratelimit()) {
|
| 1777 |
|
|
printk(KERN_DEBUG "%s: ieee80211_beacon_get: no rate "
|
| 1778 |
|
|
"found\n", wiphy_name(local->hw.wiphy));
|
| 1779 |
|
|
}
|
| 1780 |
|
|
dev_kfree_skb(skb);
|
| 1781 |
|
|
return NULL;
|
| 1782 |
|
|
}
|
| 1783 |
|
|
|
| 1784 |
|
|
control->tx_rate =
|
| 1785 |
|
|
((sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE) &&
|
| 1786 |
|
|
(rate->flags & IEEE80211_RATE_PREAMBLE2)) ?
|
| 1787 |
|
|
rate->val2 : rate->val;
|
| 1788 |
|
|
control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
|
| 1789 |
|
|
control->power_level = local->hw.conf.power_level;
|
| 1790 |
|
|
control->flags |= IEEE80211_TXCTL_NO_ACK;
|
| 1791 |
|
|
control->retry_limit = 1;
|
| 1792 |
|
|
control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
|
| 1793 |
|
|
}
|
| 1794 |
|
|
|
| 1795 |
|
|
ap->num_beacons++;
|
| 1796 |
|
|
return skb;
|
| 1797 |
|
|
}
|
| 1798 |
|
|
EXPORT_SYMBOL(ieee80211_beacon_get);
|
| 1799 |
|
|
|
| 1800 |
|
|
void ieee80211_rts_get(struct ieee80211_hw *hw, int if_id,
|
| 1801 |
|
|
const void *frame, size_t frame_len,
|
| 1802 |
|
|
const struct ieee80211_tx_control *frame_txctl,
|
| 1803 |
|
|
struct ieee80211_rts *rts)
|
| 1804 |
|
|
{
|
| 1805 |
|
|
const struct ieee80211_hdr *hdr = frame;
|
| 1806 |
|
|
u16 fctl;
|
| 1807 |
|
|
|
| 1808 |
|
|
fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS;
|
| 1809 |
|
|
rts->frame_control = cpu_to_le16(fctl);
|
| 1810 |
|
|
rts->duration = ieee80211_rts_duration(hw, if_id, frame_len, frame_txctl);
|
| 1811 |
|
|
memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
|
| 1812 |
|
|
memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
|
| 1813 |
|
|
}
|
| 1814 |
|
|
EXPORT_SYMBOL(ieee80211_rts_get);
|
| 1815 |
|
|
|
| 1816 |
|
|
void ieee80211_ctstoself_get(struct ieee80211_hw *hw, int if_id,
|
| 1817 |
|
|
const void *frame, size_t frame_len,
|
| 1818 |
|
|
const struct ieee80211_tx_control *frame_txctl,
|
| 1819 |
|
|
struct ieee80211_cts *cts)
|
| 1820 |
|
|
{
|
| 1821 |
|
|
const struct ieee80211_hdr *hdr = frame;
|
| 1822 |
|
|
u16 fctl;
|
| 1823 |
|
|
|
| 1824 |
|
|
fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS;
|
| 1825 |
|
|
cts->frame_control = cpu_to_le16(fctl);
|
| 1826 |
|
|
cts->duration = ieee80211_ctstoself_duration(hw, if_id, frame_len, frame_txctl);
|
| 1827 |
|
|
memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
|
| 1828 |
|
|
}
|
| 1829 |
|
|
EXPORT_SYMBOL(ieee80211_ctstoself_get);
|
| 1830 |
|
|
|
| 1831 |
|
|
struct sk_buff *
|
| 1832 |
|
|
ieee80211_get_buffered_bc(struct ieee80211_hw *hw, int if_id,
|
| 1833 |
|
|
struct ieee80211_tx_control *control)
|
| 1834 |
|
|
{
|
| 1835 |
|
|
struct ieee80211_local *local = hw_to_local(hw);
|
| 1836 |
|
|
struct sk_buff *skb;
|
| 1837 |
|
|
struct sta_info *sta;
|
| 1838 |
|
|
ieee80211_tx_handler *handler;
|
| 1839 |
|
|
struct ieee80211_txrx_data tx;
|
| 1840 |
|
|
ieee80211_txrx_result res = TXRX_DROP;
|
| 1841 |
|
|
struct net_device *bdev;
|
| 1842 |
|
|
struct ieee80211_sub_if_data *sdata;
|
| 1843 |
|
|
struct ieee80211_if_ap *bss = NULL;
|
| 1844 |
|
|
|
| 1845 |
|
|
bdev = dev_get_by_index(&init_net, if_id);
|
| 1846 |
|
|
if (bdev) {
|
| 1847 |
|
|
sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
|
| 1848 |
|
|
bss = &sdata->u.ap;
|
| 1849 |
|
|
dev_put(bdev);
|
| 1850 |
|
|
}
|
| 1851 |
|
|
if (!bss || sdata->type != IEEE80211_IF_TYPE_AP || !bss->beacon_head)
|
| 1852 |
|
|
return NULL;
|
| 1853 |
|
|
|
| 1854 |
|
|
if (bss->dtim_count != 0)
|
| 1855 |
|
|
return NULL; /* send buffered bc/mc only after DTIM beacon */
|
| 1856 |
|
|
memset(control, 0, sizeof(*control));
|
| 1857 |
|
|
while (1) {
|
| 1858 |
|
|
skb = skb_dequeue(&bss->ps_bc_buf);
|
| 1859 |
|
|
if (!skb)
|
| 1860 |
|
|
return NULL;
|
| 1861 |
|
|
local->total_ps_buffered--;
|
| 1862 |
|
|
|
| 1863 |
|
|
if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
|
| 1864 |
|
|
struct ieee80211_hdr *hdr =
|
| 1865 |
|
|
(struct ieee80211_hdr *) skb->data;
|
| 1866 |
|
|
/* more buffered multicast/broadcast frames ==> set
|
| 1867 |
|
|
* MoreData flag in IEEE 802.11 header to inform PS
|
| 1868 |
|
|
* STAs */
|
| 1869 |
|
|
hdr->frame_control |=
|
| 1870 |
|
|
cpu_to_le16(IEEE80211_FCTL_MOREDATA);
|
| 1871 |
|
|
}
|
| 1872 |
|
|
|
| 1873 |
|
|
if (!ieee80211_tx_prepare(&tx, skb, local->mdev, control))
|
| 1874 |
|
|
break;
|
| 1875 |
|
|
dev_kfree_skb_any(skb);
|
| 1876 |
|
|
}
|
| 1877 |
|
|
sta = tx.sta;
|
| 1878 |
|
|
tx.flags |= IEEE80211_TXRXD_TXPS_BUFFERED;
|
| 1879 |
|
|
tx.u.tx.mode = local->hw.conf.mode;
|
| 1880 |
|
|
|
| 1881 |
|
|
for (handler = local->tx_handlers; *handler != NULL; handler++) {
|
| 1882 |
|
|
res = (*handler)(&tx);
|
| 1883 |
|
|
if (res == TXRX_DROP || res == TXRX_QUEUED)
|
| 1884 |
|
|
break;
|
| 1885 |
|
|
}
|
| 1886 |
|
|
dev_put(tx.dev);
|
| 1887 |
|
|
skb = tx.skb; /* handlers are allowed to change skb */
|
| 1888 |
|
|
|
| 1889 |
|
|
if (res == TXRX_DROP) {
|
| 1890 |
|
|
I802_DEBUG_INC(local->tx_handlers_drop);
|
| 1891 |
|
|
dev_kfree_skb(skb);
|
| 1892 |
|
|
skb = NULL;
|
| 1893 |
|
|
} else if (res == TXRX_QUEUED) {
|
| 1894 |
|
|
I802_DEBUG_INC(local->tx_handlers_queued);
|
| 1895 |
|
|
skb = NULL;
|
| 1896 |
|
|
}
|
| 1897 |
|
|
|
| 1898 |
|
|
if (sta)
|
| 1899 |
|
|
sta_info_put(sta);
|
| 1900 |
|
|
|
| 1901 |
|
|
return skb;
|
| 1902 |
|
|
}
|
| 1903 |
|
|
EXPORT_SYMBOL(ieee80211_get_buffered_bc);
|
