470 lines
12 KiB
C
470 lines
12 KiB
C
/*
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* Copyright 2002-2005, Instant802 Networks, Inc.
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* Copyright 2005-2006, Devicescape Software, Inc.
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* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
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* Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* utilities for mac80211
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*/
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#include <net/mac80211.h>
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#include <linux/netdevice.h>
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#include <linux/types.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/if_arp.h>
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#include <linux/wireless.h>
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#include <linux/bitmap.h>
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#include <net/net_namespace.h>
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#include <net/cfg80211.h>
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#include <net/rtnetlink.h>
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#include "ieee80211_i.h"
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#include "rate.h"
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#include "mesh.h"
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#include "wme.h"
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/* privid for wiphys to determine whether they belong to us or not */
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void *mac80211_wiphy_privid = &mac80211_wiphy_privid;
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/* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
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/* Ethernet-II snap header (RFC1042 for most EtherTypes) */
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const unsigned char rfc1042_header[] __aligned(2) =
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{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
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/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
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const unsigned char bridge_tunnel_header[] __aligned(2) =
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{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
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u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
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enum ieee80211_if_types type)
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{
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__le16 fc = hdr->frame_control;
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/* drop ACK/CTS frames and incorrect hdr len (ctrl) */
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if (len < 16)
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return NULL;
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if (ieee80211_is_data(fc)) {
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if (len < 24) /* drop incorrect hdr len (data) */
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return NULL;
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if (ieee80211_has_a4(fc))
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return NULL;
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if (ieee80211_has_tods(fc))
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return hdr->addr1;
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if (ieee80211_has_fromds(fc))
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return hdr->addr2;
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return hdr->addr3;
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}
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if (ieee80211_is_mgmt(fc)) {
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if (len < 24) /* drop incorrect hdr len (mgmt) */
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return NULL;
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return hdr->addr3;
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}
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if (ieee80211_is_ctl(fc)) {
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if(ieee80211_is_pspoll(fc))
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return hdr->addr1;
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if (ieee80211_is_back_req(fc)) {
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switch (type) {
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case IEEE80211_IF_TYPE_STA:
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return hdr->addr2;
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case IEEE80211_IF_TYPE_AP:
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case IEEE80211_IF_TYPE_VLAN:
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return hdr->addr1;
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default:
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break; /* fall through to the return */
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}
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}
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}
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return NULL;
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}
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int ieee80211_get_hdrlen(u16 fc)
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{
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int hdrlen = 24;
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switch (fc & IEEE80211_FCTL_FTYPE) {
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case IEEE80211_FTYPE_DATA:
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if ((fc & IEEE80211_FCTL_FROMDS) && (fc & IEEE80211_FCTL_TODS))
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hdrlen = 30; /* Addr4 */
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/*
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* The QoS Control field is two bytes and its presence is
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* indicated by the IEEE80211_STYPE_QOS_DATA bit. Add 2 to
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* hdrlen if that bit is set.
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* This works by masking out the bit and shifting it to
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* bit position 1 so the result has the value 0 or 2.
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*/
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hdrlen += (fc & IEEE80211_STYPE_QOS_DATA)
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>> (ilog2(IEEE80211_STYPE_QOS_DATA)-1);
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break;
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case IEEE80211_FTYPE_CTL:
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/*
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* ACK and CTS are 10 bytes, all others 16. To see how
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* to get this condition consider
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* subtype mask: 0b0000000011110000 (0x00F0)
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* ACK subtype: 0b0000000011010000 (0x00D0)
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* CTS subtype: 0b0000000011000000 (0x00C0)
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* bits that matter: ^^^ (0x00E0)
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* value of those: 0b0000000011000000 (0x00C0)
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*/
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if ((fc & 0xE0) == 0xC0)
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hdrlen = 10;
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else
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hdrlen = 16;
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break;
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}
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return hdrlen;
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}
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EXPORT_SYMBOL(ieee80211_get_hdrlen);
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unsigned int ieee80211_hdrlen(__le16 fc)
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{
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unsigned int hdrlen = 24;
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if (ieee80211_is_data(fc)) {
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if (ieee80211_has_a4(fc))
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hdrlen = 30;
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if (ieee80211_is_data_qos(fc))
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hdrlen += IEEE80211_QOS_CTL_LEN;
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goto out;
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}
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if (ieee80211_is_ctl(fc)) {
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/*
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* ACK and CTS are 10 bytes, all others 16. To see how
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* to get this condition consider
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* subtype mask: 0b0000000011110000 (0x00F0)
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* ACK subtype: 0b0000000011010000 (0x00D0)
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* CTS subtype: 0b0000000011000000 (0x00C0)
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* bits that matter: ^^^ (0x00E0)
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* value of those: 0b0000000011000000 (0x00C0)
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*/
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if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
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hdrlen = 10;
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else
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hdrlen = 16;
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}
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out:
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return hdrlen;
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}
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EXPORT_SYMBOL(ieee80211_hdrlen);
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unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
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{
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const struct ieee80211_hdr *hdr = (const struct ieee80211_hdr *)skb->data;
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unsigned int hdrlen;
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if (unlikely(skb->len < 10))
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return 0;
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hdrlen = ieee80211_hdrlen(hdr->frame_control);
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if (unlikely(hdrlen > skb->len))
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return 0;
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return hdrlen;
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}
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EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
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int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
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{
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int ae = meshhdr->flags & IEEE80211S_FLAGS_AE;
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/* 7.1.3.5a.2 */
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switch (ae) {
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case 0:
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return 6;
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case 1:
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return 12;
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case 2:
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return 18;
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case 3:
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return 24;
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default:
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return 6;
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}
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}
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void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
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{
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struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
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hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
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if (tx->extra_frag) {
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struct ieee80211_hdr *fhdr;
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int i;
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for (i = 0; i < tx->num_extra_frag; i++) {
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fhdr = (struct ieee80211_hdr *)
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tx->extra_frag[i]->data;
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fhdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
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}
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}
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}
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int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
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int rate, int erp, int short_preamble)
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{
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int dur;
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/* calculate duration (in microseconds, rounded up to next higher
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* integer if it includes a fractional microsecond) to send frame of
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* len bytes (does not include FCS) at the given rate. Duration will
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* also include SIFS.
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*
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* rate is in 100 kbps, so divident is multiplied by 10 in the
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* DIV_ROUND_UP() operations.
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*/
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if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ || erp) {
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/*
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* OFDM:
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*
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* N_DBPS = DATARATE x 4
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* N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
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* (16 = SIGNAL time, 6 = tail bits)
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* TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
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*
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* T_SYM = 4 usec
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* 802.11a - 17.5.2: aSIFSTime = 16 usec
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* 802.11g - 19.8.4: aSIFSTime = 10 usec +
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* signal ext = 6 usec
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*/
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dur = 16; /* SIFS + signal ext */
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dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
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dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
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dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
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4 * rate); /* T_SYM x N_SYM */
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} else {
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/*
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* 802.11b or 802.11g with 802.11b compatibility:
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* 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
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* Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
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*
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* 802.11 (DS): 15.3.3, 802.11b: 18.3.4
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* aSIFSTime = 10 usec
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* aPreambleLength = 144 usec or 72 usec with short preamble
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* aPLCPHeaderLength = 48 usec or 24 usec with short preamble
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*/
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dur = 10; /* aSIFSTime = 10 usec */
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dur += short_preamble ? (72 + 24) : (144 + 48);
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dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
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}
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return dur;
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}
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/* Exported duration function for driver use */
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__le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
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struct ieee80211_vif *vif,
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size_t frame_len,
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struct ieee80211_rate *rate)
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{
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struct ieee80211_local *local = hw_to_local(hw);
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struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
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u16 dur;
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int erp;
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erp = 0;
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if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
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erp = rate->flags & IEEE80211_RATE_ERP_G;
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dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, erp,
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sdata->bss_conf.use_short_preamble);
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return cpu_to_le16(dur);
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}
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EXPORT_SYMBOL(ieee80211_generic_frame_duration);
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__le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
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struct ieee80211_vif *vif, size_t frame_len,
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const struct ieee80211_tx_info *frame_txctl)
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{
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struct ieee80211_local *local = hw_to_local(hw);
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struct ieee80211_rate *rate;
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struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
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bool short_preamble;
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int erp;
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u16 dur;
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struct ieee80211_supported_band *sband;
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sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
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short_preamble = sdata->bss_conf.use_short_preamble;
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rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
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erp = 0;
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if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
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erp = rate->flags & IEEE80211_RATE_ERP_G;
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/* CTS duration */
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dur = ieee80211_frame_duration(local, 10, rate->bitrate,
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erp, short_preamble);
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/* Data frame duration */
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dur += ieee80211_frame_duration(local, frame_len, rate->bitrate,
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erp, short_preamble);
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/* ACK duration */
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dur += ieee80211_frame_duration(local, 10, rate->bitrate,
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erp, short_preamble);
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return cpu_to_le16(dur);
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}
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EXPORT_SYMBOL(ieee80211_rts_duration);
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__le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
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struct ieee80211_vif *vif,
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size_t frame_len,
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const struct ieee80211_tx_info *frame_txctl)
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{
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struct ieee80211_local *local = hw_to_local(hw);
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struct ieee80211_rate *rate;
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struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
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bool short_preamble;
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int erp;
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u16 dur;
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struct ieee80211_supported_band *sband;
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sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
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short_preamble = sdata->bss_conf.use_short_preamble;
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rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
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erp = 0;
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if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
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erp = rate->flags & IEEE80211_RATE_ERP_G;
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/* Data frame duration */
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dur = ieee80211_frame_duration(local, frame_len, rate->bitrate,
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erp, short_preamble);
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if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
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/* ACK duration */
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dur += ieee80211_frame_duration(local, 10, rate->bitrate,
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erp, short_preamble);
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}
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return cpu_to_le16(dur);
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}
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EXPORT_SYMBOL(ieee80211_ctstoself_duration);
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void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
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{
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struct ieee80211_local *local = hw_to_local(hw);
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if (test_bit(queue, local->queues_pending)) {
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set_bit(queue, local->queues_pending_run);
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tasklet_schedule(&local->tx_pending_tasklet);
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} else {
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netif_wake_subqueue(local->mdev, queue);
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}
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}
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EXPORT_SYMBOL(ieee80211_wake_queue);
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void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
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{
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struct ieee80211_local *local = hw_to_local(hw);
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netif_stop_subqueue(local->mdev, queue);
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}
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EXPORT_SYMBOL(ieee80211_stop_queue);
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void ieee80211_stop_queues(struct ieee80211_hw *hw)
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{
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int i;
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for (i = 0; i < ieee80211_num_queues(hw); i++)
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ieee80211_stop_queue(hw, i);
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}
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EXPORT_SYMBOL(ieee80211_stop_queues);
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int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
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{
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struct ieee80211_local *local = hw_to_local(hw);
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return __netif_subqueue_stopped(local->mdev, queue);
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}
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EXPORT_SYMBOL(ieee80211_queue_stopped);
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void ieee80211_wake_queues(struct ieee80211_hw *hw)
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{
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int i;
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for (i = 0; i < hw->queues + hw->ampdu_queues; i++)
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ieee80211_wake_queue(hw, i);
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}
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EXPORT_SYMBOL(ieee80211_wake_queues);
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void ieee80211_iterate_active_interfaces(
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struct ieee80211_hw *hw,
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void (*iterator)(void *data, u8 *mac,
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struct ieee80211_vif *vif),
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void *data)
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{
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struct ieee80211_local *local = hw_to_local(hw);
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struct ieee80211_sub_if_data *sdata;
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rtnl_lock();
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list_for_each_entry(sdata, &local->interfaces, list) {
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switch (sdata->vif.type) {
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case IEEE80211_IF_TYPE_INVALID:
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case IEEE80211_IF_TYPE_MNTR:
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case IEEE80211_IF_TYPE_VLAN:
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continue;
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case IEEE80211_IF_TYPE_AP:
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case IEEE80211_IF_TYPE_STA:
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case IEEE80211_IF_TYPE_IBSS:
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case IEEE80211_IF_TYPE_WDS:
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case IEEE80211_IF_TYPE_MESH_POINT:
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break;
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}
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if (netif_running(sdata->dev))
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iterator(data, sdata->dev->dev_addr,
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&sdata->vif);
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}
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rtnl_unlock();
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}
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EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
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void ieee80211_iterate_active_interfaces_atomic(
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struct ieee80211_hw *hw,
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void (*iterator)(void *data, u8 *mac,
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struct ieee80211_vif *vif),
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void *data)
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{
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struct ieee80211_local *local = hw_to_local(hw);
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struct ieee80211_sub_if_data *sdata;
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rcu_read_lock();
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list_for_each_entry_rcu(sdata, &local->interfaces, list) {
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switch (sdata->vif.type) {
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case IEEE80211_IF_TYPE_INVALID:
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case IEEE80211_IF_TYPE_MNTR:
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case IEEE80211_IF_TYPE_VLAN:
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continue;
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case IEEE80211_IF_TYPE_AP:
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case IEEE80211_IF_TYPE_STA:
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case IEEE80211_IF_TYPE_IBSS:
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case IEEE80211_IF_TYPE_WDS:
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case IEEE80211_IF_TYPE_MESH_POINT:
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break;
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}
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if (netif_running(sdata->dev))
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iterator(data, sdata->dev->dev_addr,
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&sdata->vif);
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}
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rcu_read_unlock();
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}
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EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
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