mirror of
https://github.com/team-infusion-developers/android_kernel_samsung_msm8976.git
synced 2024-10-17 00:56:06 +00:00
c9308b06c0
This patch adds a host_strip_iv_icv flag to ieee80211 which indicates that ieee80211_rx should strip the IV/ICV/other security features from the payload. This saves on some memmove() calls in the driver and seems like something that belongs in the stack as it can be used by bcm43xx, ipw2200, and zd1211rw I will submit the ipw2200 patch separately as it needs testing. This patch also adds some sensible variable reuse (idx vs keyidx) in ieee80211_rx Signed-off-by: Daniel Drake <dsd@gentoo.org> Acked-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
564 lines
16 KiB
C
564 lines
16 KiB
C
/*
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Broadcom BCM43xx wireless driver
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Transmission (TX/RX) related functions.
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Copyright (c) 2005 Martin Langer <martin-langer@gmx.de>,
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Stefano Brivio <st3@riseup.net>
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Michael Buesch <mbuesch@freenet.de>
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Danny van Dyk <kugelfang@gentoo.org>
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Andreas Jaggi <andreas.jaggi@waterwave.ch>
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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 as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; see the file COPYING. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
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Boston, MA 02110-1301, USA.
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*/
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#include "bcm43xx_xmit.h"
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#include <linux/etherdevice.h>
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/* Extract the bitrate out of a CCK PLCP header. */
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static u8 bcm43xx_plcp_get_bitrate_cck(struct bcm43xx_plcp_hdr4 *plcp)
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{
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switch (plcp->raw[0]) {
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case 0x0A:
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return IEEE80211_CCK_RATE_1MB;
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case 0x14:
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return IEEE80211_CCK_RATE_2MB;
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case 0x37:
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return IEEE80211_CCK_RATE_5MB;
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case 0x6E:
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return IEEE80211_CCK_RATE_11MB;
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}
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assert(0);
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return 0;
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}
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/* Extract the bitrate out of an OFDM PLCP header. */
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static u8 bcm43xx_plcp_get_bitrate_ofdm(struct bcm43xx_plcp_hdr4 *plcp)
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{
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switch (plcp->raw[0] & 0xF) {
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case 0xB:
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return IEEE80211_OFDM_RATE_6MB;
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case 0xF:
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return IEEE80211_OFDM_RATE_9MB;
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case 0xA:
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return IEEE80211_OFDM_RATE_12MB;
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case 0xE:
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return IEEE80211_OFDM_RATE_18MB;
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case 0x9:
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return IEEE80211_OFDM_RATE_24MB;
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case 0xD:
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return IEEE80211_OFDM_RATE_36MB;
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case 0x8:
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return IEEE80211_OFDM_RATE_48MB;
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case 0xC:
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return IEEE80211_OFDM_RATE_54MB;
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}
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assert(0);
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return 0;
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}
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u8 bcm43xx_plcp_get_ratecode_cck(const u8 bitrate)
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{
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switch (bitrate) {
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case IEEE80211_CCK_RATE_1MB:
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return 0x0A;
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case IEEE80211_CCK_RATE_2MB:
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return 0x14;
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case IEEE80211_CCK_RATE_5MB:
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return 0x37;
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case IEEE80211_CCK_RATE_11MB:
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return 0x6E;
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}
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assert(0);
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return 0;
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}
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u8 bcm43xx_plcp_get_ratecode_ofdm(const u8 bitrate)
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{
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switch (bitrate) {
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case IEEE80211_OFDM_RATE_6MB:
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return 0xB;
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case IEEE80211_OFDM_RATE_9MB:
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return 0xF;
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case IEEE80211_OFDM_RATE_12MB:
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return 0xA;
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case IEEE80211_OFDM_RATE_18MB:
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return 0xE;
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case IEEE80211_OFDM_RATE_24MB:
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return 0x9;
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case IEEE80211_OFDM_RATE_36MB:
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return 0xD;
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case IEEE80211_OFDM_RATE_48MB:
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return 0x8;
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case IEEE80211_OFDM_RATE_54MB:
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return 0xC;
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}
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assert(0);
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return 0;
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}
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static void bcm43xx_generate_plcp_hdr(struct bcm43xx_plcp_hdr4 *plcp,
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const u16 octets, const u8 bitrate,
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const int ofdm_modulation)
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{
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__le32 *data = &(plcp->data);
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__u8 *raw = plcp->raw;
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if (ofdm_modulation) {
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*data = bcm43xx_plcp_get_ratecode_ofdm(bitrate);
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assert(!(octets & 0xF000));
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*data |= (octets << 5);
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*data = cpu_to_le32(*data);
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} else {
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u32 plen;
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plen = octets * 16 / bitrate;
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if ((octets * 16 % bitrate) > 0) {
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plen++;
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if ((bitrate == IEEE80211_CCK_RATE_11MB)
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&& ((octets * 8 % 11) < 4)) {
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raw[1] = 0x84;
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} else
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raw[1] = 0x04;
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} else
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raw[1] = 0x04;
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*data |= cpu_to_le32(plen << 16);
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raw[0] = bcm43xx_plcp_get_ratecode_cck(bitrate);
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}
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}
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static u8 bcm43xx_calc_fallback_rate(u8 bitrate)
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{
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switch (bitrate) {
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case IEEE80211_CCK_RATE_1MB:
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return IEEE80211_CCK_RATE_1MB;
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case IEEE80211_CCK_RATE_2MB:
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return IEEE80211_CCK_RATE_1MB;
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case IEEE80211_CCK_RATE_5MB:
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return IEEE80211_CCK_RATE_2MB;
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case IEEE80211_CCK_RATE_11MB:
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return IEEE80211_CCK_RATE_5MB;
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case IEEE80211_OFDM_RATE_6MB:
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return IEEE80211_CCK_RATE_5MB;
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case IEEE80211_OFDM_RATE_9MB:
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return IEEE80211_OFDM_RATE_6MB;
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case IEEE80211_OFDM_RATE_12MB:
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return IEEE80211_OFDM_RATE_9MB;
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case IEEE80211_OFDM_RATE_18MB:
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return IEEE80211_OFDM_RATE_12MB;
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case IEEE80211_OFDM_RATE_24MB:
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return IEEE80211_OFDM_RATE_18MB;
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case IEEE80211_OFDM_RATE_36MB:
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return IEEE80211_OFDM_RATE_24MB;
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case IEEE80211_OFDM_RATE_48MB:
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return IEEE80211_OFDM_RATE_36MB;
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case IEEE80211_OFDM_RATE_54MB:
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return IEEE80211_OFDM_RATE_48MB;
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}
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assert(0);
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return 0;
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}
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static
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__le16 bcm43xx_calc_duration_id(const struct ieee80211_hdr *wireless_header,
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u8 bitrate)
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{
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const u16 frame_ctl = le16_to_cpu(wireless_header->frame_ctl);
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__le16 duration_id = wireless_header->duration_id;
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switch (WLAN_FC_GET_TYPE(frame_ctl)) {
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case IEEE80211_FTYPE_DATA:
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case IEEE80211_FTYPE_MGMT:
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//TODO: Steal the code from ieee80211, once it is completed there.
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break;
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case IEEE80211_FTYPE_CTL:
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/* Use the original duration/id. */
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break;
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default:
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assert(0);
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}
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return duration_id;
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}
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static inline
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u16 ceiling_div(u16 dividend, u16 divisor)
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{
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return ((dividend + divisor - 1) / divisor);
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}
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static void bcm43xx_generate_rts(const struct bcm43xx_phyinfo *phy,
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struct bcm43xx_txhdr *txhdr,
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u16 *flags,
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u8 bitrate,
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const struct ieee80211_hdr_4addr *wlhdr)
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{
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u16 fctl;
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u16 dur;
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u8 fallback_bitrate;
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int ofdm_modulation;
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int fallback_ofdm_modulation;
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// u8 *sa, *da;
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u16 flen;
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//FIXME sa = ieee80211_get_SA((struct ieee80211_hdr *)wlhdr);
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//FIXME da = ieee80211_get_DA((struct ieee80211_hdr *)wlhdr);
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fallback_bitrate = bcm43xx_calc_fallback_rate(bitrate);
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ofdm_modulation = !(ieee80211_is_cck_rate(bitrate));
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fallback_ofdm_modulation = !(ieee80211_is_cck_rate(fallback_bitrate));
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flen = sizeof(u16) + sizeof(u16) + ETH_ALEN + ETH_ALEN + IEEE80211_FCS_LEN,
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bcm43xx_generate_plcp_hdr((struct bcm43xx_plcp_hdr4 *)(&txhdr->rts_cts_plcp),
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flen, bitrate,
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!ieee80211_is_cck_rate(bitrate));
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bcm43xx_generate_plcp_hdr((struct bcm43xx_plcp_hdr4 *)(&txhdr->rts_cts_fallback_plcp),
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flen, fallback_bitrate,
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!ieee80211_is_cck_rate(fallback_bitrate));
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fctl = IEEE80211_FTYPE_CTL;
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fctl |= IEEE80211_STYPE_RTS;
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dur = le16_to_cpu(wlhdr->duration_id);
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/*FIXME: should we test for dur==0 here and let it unmodified in this case?
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* The following assert checks for this case...
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*/
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assert(dur);
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/*FIXME: The duration calculation is not really correct.
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* I am not 100% sure which bitrate to use. We use the RTS rate here,
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* but this is likely to be wrong.
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*/
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if (phy->type == BCM43xx_PHYTYPE_A) {
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/* Three times SIFS */
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dur += 16 * 3;
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/* Add ACK duration. */
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dur += ceiling_div((16 + 8 * (14 /*bytes*/) + 6) * 10,
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bitrate * 4);
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/* Add CTS duration. */
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dur += ceiling_div((16 + 8 * (14 /*bytes*/) + 6) * 10,
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bitrate * 4);
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} else {
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/* Three times SIFS */
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dur += 10 * 3;
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/* Add ACK duration. */
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dur += ceiling_div(8 * (14 /*bytes*/) * 10,
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bitrate);
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/* Add CTS duration. */
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dur += ceiling_div(8 * (14 /*bytes*/) * 10,
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bitrate);
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}
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txhdr->rts_cts_frame_control = cpu_to_le16(fctl);
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txhdr->rts_cts_dur = cpu_to_le16(dur);
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//printk(BCM43xx_MACFMT " " BCM43xx_MACFMT " " BCM43xx_MACFMT "\n", BCM43xx_MACARG(wlhdr->addr1), BCM43xx_MACARG(wlhdr->addr2), BCM43xx_MACARG(wlhdr->addr3));
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//printk(BCM43xx_MACFMT " " BCM43xx_MACFMT "\n", BCM43xx_MACARG(sa), BCM43xx_MACARG(da));
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memcpy(txhdr->rts_cts_mac1, wlhdr->addr1, ETH_ALEN);//FIXME!
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// memcpy(txhdr->rts_cts_mac2, sa, ETH_ALEN);
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*flags |= BCM43xx_TXHDRFLAG_RTSCTS;
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*flags |= BCM43xx_TXHDRFLAG_RTS;
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if (ofdm_modulation)
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*flags |= BCM43xx_TXHDRFLAG_RTSCTS_OFDM;
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if (fallback_ofdm_modulation)
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*flags |= BCM43xx_TXHDRFLAG_RTSCTSFALLBACK_OFDM;
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}
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void bcm43xx_generate_txhdr(struct bcm43xx_private *bcm,
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struct bcm43xx_txhdr *txhdr,
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const unsigned char *fragment_data,
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const unsigned int fragment_len,
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const int is_first_fragment,
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const u16 cookie)
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{
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const struct bcm43xx_phyinfo *phy = bcm43xx_current_phy(bcm);
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const struct ieee80211_hdr_4addr *wireless_header = (const struct ieee80211_hdr_4addr *)fragment_data;
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const struct ieee80211_security *secinfo = &bcm->ieee->sec;
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u8 bitrate;
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u8 fallback_bitrate;
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int ofdm_modulation;
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int fallback_ofdm_modulation;
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u16 plcp_fragment_len = fragment_len;
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u16 flags = 0;
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u16 control = 0;
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u16 wsec_rate = 0;
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u16 encrypt_frame;
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const u16 ftype = WLAN_FC_GET_TYPE(le16_to_cpu(wireless_header->frame_ctl));
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const int is_mgt = (ftype == IEEE80211_FTYPE_MGMT);
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/* Now construct the TX header. */
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memset(txhdr, 0, sizeof(*txhdr));
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bitrate = ieee80211softmac_suggest_txrate(bcm->softmac,
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is_multicast_ether_addr(wireless_header->addr1), is_mgt);
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ofdm_modulation = !(ieee80211_is_cck_rate(bitrate));
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fallback_bitrate = bcm43xx_calc_fallback_rate(bitrate);
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fallback_ofdm_modulation = !(ieee80211_is_cck_rate(fallback_bitrate));
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/* Set Frame Control from 80211 header. */
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txhdr->frame_control = wireless_header->frame_ctl;
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/* Copy address1 from 80211 header. */
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memcpy(txhdr->mac1, wireless_header->addr1, 6);
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/* Set the fallback duration ID. */
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txhdr->fallback_dur_id = bcm43xx_calc_duration_id((const struct ieee80211_hdr *)wireless_header,
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fallback_bitrate);
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/* Set the cookie (used as driver internal ID for the frame) */
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txhdr->cookie = cpu_to_le16(cookie);
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/* Hardware appends FCS. */
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plcp_fragment_len += IEEE80211_FCS_LEN;
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/* Hardware encryption. */
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encrypt_frame = le16_to_cpup(&wireless_header->frame_ctl) & IEEE80211_FCTL_PROTECTED;
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if (encrypt_frame && !bcm->ieee->host_encrypt) {
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const struct ieee80211_hdr_3addr *hdr = (struct ieee80211_hdr_3addr *)wireless_header;
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memcpy(txhdr->wep_iv, hdr->payload, 4);
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/* Hardware appends ICV. */
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plcp_fragment_len += 4;
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wsec_rate |= (bcm->key[secinfo->active_key].algorithm << BCM43xx_TXHDR_WSEC_ALGO_SHIFT)
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& BCM43xx_TXHDR_WSEC_ALGO_MASK;
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wsec_rate |= (secinfo->active_key << BCM43xx_TXHDR_WSEC_KEYINDEX_SHIFT)
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& BCM43xx_TXHDR_WSEC_KEYINDEX_MASK;
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}
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/* Generate the PLCP header and the fallback PLCP header. */
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bcm43xx_generate_plcp_hdr((struct bcm43xx_plcp_hdr4 *)(&txhdr->plcp),
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plcp_fragment_len,
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bitrate, ofdm_modulation);
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bcm43xx_generate_plcp_hdr(&txhdr->fallback_plcp, plcp_fragment_len,
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fallback_bitrate, fallback_ofdm_modulation);
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/* Set the CONTROL field */
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if (ofdm_modulation)
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control |= BCM43xx_TXHDRCTL_OFDM;
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if (bcm->short_preamble) //FIXME: could be the other way around, please test
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control |= BCM43xx_TXHDRCTL_SHORT_PREAMBLE;
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control |= (phy->antenna_diversity << BCM43xx_TXHDRCTL_ANTENNADIV_SHIFT)
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& BCM43xx_TXHDRCTL_ANTENNADIV_MASK;
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/* Set the FLAGS field */
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if (!is_multicast_ether_addr(wireless_header->addr1) &&
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!is_broadcast_ether_addr(wireless_header->addr1))
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flags |= BCM43xx_TXHDRFLAG_EXPECTACK;
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if (1 /* FIXME: PS poll?? */)
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flags |= 0x10; // FIXME: unknown meaning.
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if (fallback_ofdm_modulation)
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flags |= BCM43xx_TXHDRFLAG_FALLBACKOFDM;
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if (is_first_fragment)
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flags |= BCM43xx_TXHDRFLAG_FIRSTFRAGMENT;
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/* Set WSEC/RATE field */
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wsec_rate |= (txhdr->plcp.raw[0] << BCM43xx_TXHDR_RATE_SHIFT)
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& BCM43xx_TXHDR_RATE_MASK;
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/* Generate the RTS/CTS packet, if required. */
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/* FIXME: We should first try with CTS-to-self,
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* if we are on 80211g. If we get too many
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* failures (hidden nodes), we should switch back to RTS/CTS.
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*/
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if (0/*FIXME txctl->use_rts_cts*/) {
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bcm43xx_generate_rts(phy, txhdr, &flags,
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0/*FIXME txctl->rts_cts_rate*/,
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wireless_header);
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}
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txhdr->flags = cpu_to_le16(flags);
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txhdr->control = cpu_to_le16(control);
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txhdr->wsec_rate = cpu_to_le16(wsec_rate);
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}
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static s8 bcm43xx_rssi_postprocess(struct bcm43xx_private *bcm,
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u8 in_rssi, int ofdm,
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int adjust_2053, int adjust_2050)
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{
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struct bcm43xx_radioinfo *radio = bcm43xx_current_radio(bcm);
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struct bcm43xx_phyinfo *phy = bcm43xx_current_phy(bcm);
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s32 tmp;
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switch (radio->version) {
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case 0x2050:
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if (ofdm) {
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tmp = in_rssi;
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if (tmp > 127)
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tmp -= 256;
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tmp *= 73;
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tmp /= 64;
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if (adjust_2050)
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tmp += 25;
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else
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tmp -= 3;
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} else {
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if (bcm->sprom.boardflags & BCM43xx_BFL_RSSI) {
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if (in_rssi > 63)
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in_rssi = 63;
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tmp = radio->nrssi_lt[in_rssi];
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tmp = 31 - tmp;
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tmp *= -131;
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tmp /= 128;
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tmp -= 57;
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} else {
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tmp = in_rssi;
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tmp = 31 - tmp;
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tmp *= -149;
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tmp /= 128;
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tmp -= 68;
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}
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if (phy->type == BCM43xx_PHYTYPE_G &&
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adjust_2050)
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tmp += 25;
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}
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break;
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case 0x2060:
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if (in_rssi > 127)
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tmp = in_rssi - 256;
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else
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tmp = in_rssi;
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break;
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default:
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tmp = in_rssi;
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tmp -= 11;
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tmp *= 103;
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tmp /= 64;
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if (adjust_2053)
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tmp -= 109;
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else
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tmp -= 83;
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}
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return (s8)tmp;
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}
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//TODO
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#if 0
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static s8 bcm43xx_rssinoise_postprocess(struct bcm43xx_private *bcm,
|
|
u8 in_rssi)
|
|
{
|
|
struct bcm43xx_phyinfo *phy = bcm43xx_current_phy(bcm);
|
|
s8 ret;
|
|
|
|
if (phy->type == BCM43xx_PHYTYPE_A) {
|
|
//TODO: Incomplete specs.
|
|
ret = 0;
|
|
} else
|
|
ret = bcm43xx_rssi_postprocess(bcm, in_rssi, 0, 1, 1);
|
|
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
int bcm43xx_rx(struct bcm43xx_private *bcm,
|
|
struct sk_buff *skb,
|
|
struct bcm43xx_rxhdr *rxhdr)
|
|
{
|
|
struct bcm43xx_radioinfo *radio = bcm43xx_current_radio(bcm);
|
|
struct bcm43xx_phyinfo *phy = bcm43xx_current_phy(bcm);
|
|
struct bcm43xx_plcp_hdr4 *plcp;
|
|
struct ieee80211_rx_stats stats;
|
|
struct ieee80211_hdr_4addr *wlhdr;
|
|
u16 frame_ctl;
|
|
int is_packet_for_us = 0;
|
|
int err = -EINVAL;
|
|
const u16 rxflags1 = le16_to_cpu(rxhdr->flags1);
|
|
const u16 rxflags2 = le16_to_cpu(rxhdr->flags2);
|
|
const u16 rxflags3 = le16_to_cpu(rxhdr->flags3);
|
|
const int is_ofdm = !!(rxflags1 & BCM43xx_RXHDR_FLAGS1_OFDM);
|
|
|
|
if (rxflags2 & BCM43xx_RXHDR_FLAGS2_TYPE2FRAME) {
|
|
plcp = (struct bcm43xx_plcp_hdr4 *)(skb->data + 2);
|
|
/* Skip two unknown bytes and the PLCP header. */
|
|
skb_pull(skb, 2 + sizeof(struct bcm43xx_plcp_hdr6));
|
|
} else {
|
|
plcp = (struct bcm43xx_plcp_hdr4 *)(skb->data);
|
|
/* Skip the PLCP header. */
|
|
skb_pull(skb, sizeof(struct bcm43xx_plcp_hdr6));
|
|
}
|
|
/* The SKB contains the PAYLOAD (wireless header + data)
|
|
* at this point. The FCS at the end is stripped.
|
|
*/
|
|
|
|
memset(&stats, 0, sizeof(stats));
|
|
stats.mac_time = le16_to_cpu(rxhdr->mactime);
|
|
stats.rssi = rxhdr->rssi;
|
|
stats.signal = bcm43xx_rssi_postprocess(bcm, rxhdr->rssi, is_ofdm,
|
|
!!(rxflags1 & BCM43xx_RXHDR_FLAGS1_2053RSSIADJ),
|
|
!!(rxflags3 & BCM43xx_RXHDR_FLAGS3_2050RSSIADJ));
|
|
stats.noise = bcm->stats.noise;
|
|
if (is_ofdm)
|
|
stats.rate = bcm43xx_plcp_get_bitrate_ofdm(plcp);
|
|
else
|
|
stats.rate = bcm43xx_plcp_get_bitrate_cck(plcp);
|
|
stats.received_channel = radio->channel;
|
|
stats.mask = IEEE80211_STATMASK_SIGNAL |
|
|
IEEE80211_STATMASK_NOISE |
|
|
IEEE80211_STATMASK_RATE |
|
|
IEEE80211_STATMASK_RSSI;
|
|
if (phy->type == BCM43xx_PHYTYPE_A)
|
|
stats.freq = IEEE80211_52GHZ_BAND;
|
|
else
|
|
stats.freq = IEEE80211_24GHZ_BAND;
|
|
stats.len = skb->len;
|
|
|
|
bcm->stats.last_rx = jiffies;
|
|
if (bcm->ieee->iw_mode == IW_MODE_MONITOR) {
|
|
err = ieee80211_rx(bcm->ieee, skb, &stats);
|
|
return (err == 0) ? -EINVAL : 0;
|
|
}
|
|
|
|
wlhdr = (struct ieee80211_hdr_4addr *)(skb->data);
|
|
|
|
switch (bcm->ieee->iw_mode) {
|
|
case IW_MODE_ADHOC:
|
|
if (memcmp(wlhdr->addr1, bcm->net_dev->dev_addr, ETH_ALEN) == 0 ||
|
|
memcmp(wlhdr->addr3, bcm->ieee->bssid, ETH_ALEN) == 0 ||
|
|
is_broadcast_ether_addr(wlhdr->addr1) ||
|
|
is_multicast_ether_addr(wlhdr->addr1) ||
|
|
bcm->net_dev->flags & IFF_PROMISC)
|
|
is_packet_for_us = 1;
|
|
break;
|
|
case IW_MODE_INFRA:
|
|
default:
|
|
/* When receiving multicast or broadcast packets, filter out
|
|
the packets we send ourself; we shouldn't see those */
|
|
if (memcmp(wlhdr->addr3, bcm->ieee->bssid, ETH_ALEN) == 0 ||
|
|
memcmp(wlhdr->addr1, bcm->net_dev->dev_addr, ETH_ALEN) == 0 ||
|
|
(memcmp(wlhdr->addr3, bcm->net_dev->dev_addr, ETH_ALEN) &&
|
|
(is_broadcast_ether_addr(wlhdr->addr1) ||
|
|
is_multicast_ether_addr(wlhdr->addr1) ||
|
|
bcm->net_dev->flags & IFF_PROMISC)))
|
|
is_packet_for_us = 1;
|
|
break;
|
|
}
|
|
|
|
switch (WLAN_FC_GET_TYPE(frame_ctl)) {
|
|
case IEEE80211_FTYPE_MGMT:
|
|
ieee80211_rx_mgt(bcm->ieee, wlhdr, &stats);
|
|
break;
|
|
case IEEE80211_FTYPE_DATA:
|
|
if (is_packet_for_us) {
|
|
err = ieee80211_rx(bcm->ieee, skb, &stats);
|
|
err = (err == 0) ? -EINVAL : 0;
|
|
}
|
|
break;
|
|
case IEEE80211_FTYPE_CTL:
|
|
break;
|
|
default:
|
|
assert(0);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return err;
|
|
}
|