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path: root/drivers/net/wireless/bcm43xx/bcm43xx_xmit.c
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Diffstat (limited to 'drivers/net/wireless/bcm43xx/bcm43xx_xmit.c')
-rw-r--r--drivers/net/wireless/bcm43xx/bcm43xx_xmit.c582
1 files changed, 582 insertions, 0 deletions
diff --git a/drivers/net/wireless/bcm43xx/bcm43xx_xmit.c b/drivers/net/wireless/bcm43xx/bcm43xx_xmit.c
new file mode 100644
index 000000000000..d8ece28c079f
--- /dev/null
+++ b/drivers/net/wireless/bcm43xx/bcm43xx_xmit.c
@@ -0,0 +1,582 @@
+/*
+
+ Broadcom BCM43xx wireless driver
+
+ Transmission (TX/RX) related functions.
+
+ Copyright (c) 2005 Martin Langer <martin-langer@gmx.de>,
+ Stefano Brivio <st3@riseup.net>
+ Michael Buesch <mbuesch@freenet.de>
+ Danny van Dyk <kugelfang@gentoo.org>
+ Andreas Jaggi <andreas.jaggi@waterwave.ch>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; see the file COPYING. If not, write to
+ the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
+ Boston, MA 02110-1301, USA.
+
+*/
+
+#include "bcm43xx_xmit.h"
+
+#include <linux/etherdevice.h>
+
+
+/* Extract the bitrate out of a CCK PLCP header. */
+static u8 bcm43xx_plcp_get_bitrate_cck(struct bcm43xx_plcp_hdr4 *plcp)
+{
+ switch (plcp->raw[0]) {
+ case 0x0A:
+ return IEEE80211_CCK_RATE_1MB;
+ case 0x14:
+ return IEEE80211_CCK_RATE_2MB;
+ case 0x37:
+ return IEEE80211_CCK_RATE_5MB;
+ case 0x6E:
+ return IEEE80211_CCK_RATE_11MB;
+ }
+ assert(0);
+ return 0;
+}
+
+/* Extract the bitrate out of an OFDM PLCP header. */
+static u8 bcm43xx_plcp_get_bitrate_ofdm(struct bcm43xx_plcp_hdr4 *plcp)
+{
+ switch (plcp->raw[0] & 0xF) {
+ case 0xB:
+ return IEEE80211_OFDM_RATE_6MB;
+ case 0xF:
+ return IEEE80211_OFDM_RATE_9MB;
+ case 0xA:
+ return IEEE80211_OFDM_RATE_12MB;
+ case 0xE:
+ return IEEE80211_OFDM_RATE_18MB;
+ case 0x9:
+ return IEEE80211_OFDM_RATE_24MB;
+ case 0xD:
+ return IEEE80211_OFDM_RATE_36MB;
+ case 0x8:
+ return IEEE80211_OFDM_RATE_48MB;
+ case 0xC:
+ return IEEE80211_OFDM_RATE_54MB;
+ }
+ assert(0);
+ return 0;
+}
+
+u8 bcm43xx_plcp_get_ratecode_cck(const u8 bitrate)
+{
+ switch (bitrate) {
+ case IEEE80211_CCK_RATE_1MB:
+ return 0x0A;
+ case IEEE80211_CCK_RATE_2MB:
+ return 0x14;
+ case IEEE80211_CCK_RATE_5MB:
+ return 0x37;
+ case IEEE80211_CCK_RATE_11MB:
+ return 0x6E;
+ }
+ assert(0);
+ return 0;
+}
+
+u8 bcm43xx_plcp_get_ratecode_ofdm(const u8 bitrate)
+{
+ switch (bitrate) {
+ case IEEE80211_OFDM_RATE_6MB:
+ return 0xB;
+ case IEEE80211_OFDM_RATE_9MB:
+ return 0xF;
+ case IEEE80211_OFDM_RATE_12MB:
+ return 0xA;
+ case IEEE80211_OFDM_RATE_18MB:
+ return 0xE;
+ case IEEE80211_OFDM_RATE_24MB:
+ return 0x9;
+ case IEEE80211_OFDM_RATE_36MB:
+ return 0xD;
+ case IEEE80211_OFDM_RATE_48MB:
+ return 0x8;
+ case IEEE80211_OFDM_RATE_54MB:
+ return 0xC;
+ }
+ assert(0);
+ return 0;
+}
+
+static void bcm43xx_generate_plcp_hdr(struct bcm43xx_plcp_hdr4 *plcp,
+ const u16 octets, const u8 bitrate,
+ const int ofdm_modulation)
+{
+ __le32 *data = &(plcp->data);
+ __u8 *raw = plcp->raw;
+
+ if (ofdm_modulation) {
+ *data = bcm43xx_plcp_get_ratecode_ofdm(bitrate);
+ assert(!(octets & 0xF000));
+ *data |= (octets << 5);
+ *data = cpu_to_le32(*data);
+ } else {
+ u32 plen;
+
+ plen = octets * 16 / bitrate;
+ if ((octets * 16 % bitrate) > 0) {
+ plen++;
+ if ((bitrate == IEEE80211_CCK_RATE_11MB)
+ && ((octets * 8 % 11) < 4)) {
+ raw[1] = 0x84;
+ } else
+ raw[1] = 0x04;
+ } else
+ raw[1] = 0x04;
+ *data |= cpu_to_le32(plen << 16);
+ raw[0] = bcm43xx_plcp_get_ratecode_cck(bitrate);
+ }
+}
+
+static u8 bcm43xx_calc_fallback_rate(u8 bitrate)
+{
+ switch (bitrate) {
+ case IEEE80211_CCK_RATE_1MB:
+ return IEEE80211_CCK_RATE_1MB;
+ case IEEE80211_CCK_RATE_2MB:
+ return IEEE80211_CCK_RATE_1MB;
+ case IEEE80211_CCK_RATE_5MB:
+ return IEEE80211_CCK_RATE_2MB;
+ case IEEE80211_CCK_RATE_11MB:
+ return IEEE80211_CCK_RATE_5MB;
+ case IEEE80211_OFDM_RATE_6MB:
+ return IEEE80211_CCK_RATE_5MB;
+ case IEEE80211_OFDM_RATE_9MB:
+ return IEEE80211_OFDM_RATE_6MB;
+ case IEEE80211_OFDM_RATE_12MB:
+ return IEEE80211_OFDM_RATE_9MB;
+ case IEEE80211_OFDM_RATE_18MB:
+ return IEEE80211_OFDM_RATE_12MB;
+ case IEEE80211_OFDM_RATE_24MB:
+ return IEEE80211_OFDM_RATE_18MB;
+ case IEEE80211_OFDM_RATE_36MB:
+ return IEEE80211_OFDM_RATE_24MB;
+ case IEEE80211_OFDM_RATE_48MB:
+ return IEEE80211_OFDM_RATE_36MB;
+ case IEEE80211_OFDM_RATE_54MB:
+ return IEEE80211_OFDM_RATE_48MB;
+ }
+ assert(0);
+ return 0;
+}
+
+static
+__le16 bcm43xx_calc_duration_id(const struct ieee80211_hdr *wireless_header,
+ u8 bitrate)
+{
+ const u16 frame_ctl = le16_to_cpu(wireless_header->frame_ctl);
+ __le16 duration_id = wireless_header->duration_id;
+
+ switch (WLAN_FC_GET_TYPE(frame_ctl)) {
+ case IEEE80211_FTYPE_DATA:
+ case IEEE80211_FTYPE_MGMT:
+ //TODO: Steal the code from ieee80211, once it is completed there.
+ break;
+ case IEEE80211_FTYPE_CTL:
+ /* Use the original duration/id. */
+ break;
+ default:
+ assert(0);
+ }
+
+ return duration_id;
+}
+
+static inline
+u16 ceiling_div(u16 dividend, u16 divisor)
+{
+ return ((dividend + divisor - 1) / divisor);
+}
+
+static void bcm43xx_generate_rts(const struct bcm43xx_phyinfo *phy,
+ struct bcm43xx_txhdr *txhdr,
+ u16 *flags,
+ u8 bitrate,
+ const struct ieee80211_hdr_4addr *wlhdr)
+{
+ u16 fctl;
+ u16 dur;
+ u8 fallback_bitrate;
+ int ofdm_modulation;
+ int fallback_ofdm_modulation;
+// u8 *sa, *da;
+ u16 flen;
+
+//FIXME sa = ieee80211_get_SA((struct ieee80211_hdr *)wlhdr);
+//FIXME da = ieee80211_get_DA((struct ieee80211_hdr *)wlhdr);
+ fallback_bitrate = bcm43xx_calc_fallback_rate(bitrate);
+ ofdm_modulation = !(ieee80211_is_cck_rate(bitrate));
+ fallback_ofdm_modulation = !(ieee80211_is_cck_rate(fallback_bitrate));
+
+ flen = sizeof(u16) + sizeof(u16) + ETH_ALEN + ETH_ALEN + IEEE80211_FCS_LEN,
+ bcm43xx_generate_plcp_hdr((struct bcm43xx_plcp_hdr4 *)(&txhdr->rts_cts_plcp),
+ flen, bitrate,
+ !ieee80211_is_cck_rate(bitrate));
+ bcm43xx_generate_plcp_hdr((struct bcm43xx_plcp_hdr4 *)(&txhdr->rts_cts_fallback_plcp),
+ flen, fallback_bitrate,
+ !ieee80211_is_cck_rate(fallback_bitrate));
+ fctl = IEEE80211_FTYPE_CTL;
+ fctl |= IEEE80211_STYPE_RTS;
+ dur = le16_to_cpu(wlhdr->duration_id);
+/*FIXME: should we test for dur==0 here and let it unmodified in this case?
+ * The following assert checks for this case...
+ */
+assert(dur);
+/*FIXME: The duration calculation is not really correct.
+ * I am not 100% sure which bitrate to use. We use the RTS rate here,
+ * but this is likely to be wrong.
+ */
+ if (phy->type == BCM43xx_PHYTYPE_A) {
+ /* Three times SIFS */
+ dur += 16 * 3;
+ /* Add ACK duration. */
+ dur += ceiling_div((16 + 8 * (14 /*bytes*/) + 6) * 10,
+ bitrate * 4);
+ /* Add CTS duration. */
+ dur += ceiling_div((16 + 8 * (14 /*bytes*/) + 6) * 10,
+ bitrate * 4);
+ } else {
+ /* Three times SIFS */
+ dur += 10 * 3;
+ /* Add ACK duration. */
+ dur += ceiling_div(8 * (14 /*bytes*/) * 10,
+ bitrate);
+ /* Add CTS duration. */
+ dur += ceiling_div(8 * (14 /*bytes*/) * 10,
+ bitrate);
+ }
+
+ txhdr->rts_cts_frame_control = cpu_to_le16(fctl);
+ txhdr->rts_cts_dur = cpu_to_le16(dur);
+//printk(BCM43xx_MACFMT " " BCM43xx_MACFMT " " BCM43xx_MACFMT "\n", BCM43xx_MACARG(wlhdr->addr1), BCM43xx_MACARG(wlhdr->addr2), BCM43xx_MACARG(wlhdr->addr3));
+//printk(BCM43xx_MACFMT " " BCM43xx_MACFMT "\n", BCM43xx_MACARG(sa), BCM43xx_MACARG(da));
+ memcpy(txhdr->rts_cts_mac1, wlhdr->addr1, ETH_ALEN);//FIXME!
+// memcpy(txhdr->rts_cts_mac2, sa, ETH_ALEN);
+
+ *flags |= BCM43xx_TXHDRFLAG_RTSCTS;
+ *flags |= BCM43xx_TXHDRFLAG_RTS;
+ if (ofdm_modulation)
+ *flags |= BCM43xx_TXHDRFLAG_RTSCTS_OFDM;
+ if (fallback_ofdm_modulation)
+ *flags |= BCM43xx_TXHDRFLAG_RTSCTSFALLBACK_OFDM;
+}
+
+void bcm43xx_generate_txhdr(struct bcm43xx_private *bcm,
+ struct bcm43xx_txhdr *txhdr,
+ const unsigned char *fragment_data,
+ const unsigned int fragment_len,
+ const int is_first_fragment,
+ const u16 cookie)
+{
+ const struct bcm43xx_phyinfo *phy = bcm43xx_current_phy(bcm);
+ const struct ieee80211_hdr_4addr *wireless_header = (const struct ieee80211_hdr_4addr *)fragment_data;
+ const struct ieee80211_security *secinfo = &bcm->ieee->sec;
+ u8 bitrate;
+ u8 fallback_bitrate;
+ int ofdm_modulation;
+ int fallback_ofdm_modulation;
+ u16 plcp_fragment_len = fragment_len;
+ u16 flags = 0;
+ u16 control = 0;
+ u16 wsec_rate = 0;
+ u16 encrypt_frame;
+
+ /* Now construct the TX header. */
+ memset(txhdr, 0, sizeof(*txhdr));
+
+ bitrate = bcm->softmac->txrates.default_rate;
+ ofdm_modulation = !(ieee80211_is_cck_rate(bitrate));
+ fallback_bitrate = bcm43xx_calc_fallback_rate(bitrate);
+ fallback_ofdm_modulation = !(ieee80211_is_cck_rate(fallback_bitrate));
+
+ /* Set Frame Control from 80211 header. */
+ txhdr->frame_control = wireless_header->frame_ctl;
+ /* Copy address1 from 80211 header. */
+ memcpy(txhdr->mac1, wireless_header->addr1, 6);
+ /* Set the fallback duration ID. */
+ txhdr->fallback_dur_id = bcm43xx_calc_duration_id((const struct ieee80211_hdr *)wireless_header,
+ fallback_bitrate);
+ /* Set the cookie (used as driver internal ID for the frame) */
+ txhdr->cookie = cpu_to_le16(cookie);
+
+ /* Hardware appends FCS. */
+ plcp_fragment_len += IEEE80211_FCS_LEN;
+
+ /* Hardware encryption. */
+ encrypt_frame = le16_to_cpup(&wireless_header->frame_ctl) & IEEE80211_FCTL_PROTECTED;
+ if (encrypt_frame && !bcm->ieee->host_encrypt) {
+ const struct ieee80211_hdr_3addr *hdr = (struct ieee80211_hdr_3addr *)wireless_header;
+ memcpy(txhdr->wep_iv, hdr->payload, 4);
+ /* Hardware appends ICV. */
+ plcp_fragment_len += 4;
+
+ wsec_rate |= (bcm->key[secinfo->active_key].algorithm << BCM43xx_TXHDR_WSEC_ALGO_SHIFT)
+ & BCM43xx_TXHDR_WSEC_ALGO_MASK;
+ wsec_rate |= (secinfo->active_key << BCM43xx_TXHDR_WSEC_KEYINDEX_SHIFT)
+ & BCM43xx_TXHDR_WSEC_KEYINDEX_MASK;
+ }
+
+ /* Generate the PLCP header and the fallback PLCP header. */
+ bcm43xx_generate_plcp_hdr((struct bcm43xx_plcp_hdr4 *)(&txhdr->plcp),
+ plcp_fragment_len,
+ bitrate, ofdm_modulation);
+ bcm43xx_generate_plcp_hdr(&txhdr->fallback_plcp, plcp_fragment_len,
+ fallback_bitrate, fallback_ofdm_modulation);
+
+ /* Set the CONTROL field */
+ if (ofdm_modulation)
+ control |= BCM43xx_TXHDRCTL_OFDM;
+ if (bcm->short_preamble) //FIXME: could be the other way around, please test
+ control |= BCM43xx_TXHDRCTL_SHORT_PREAMBLE;
+ control |= (phy->antenna_diversity << BCM43xx_TXHDRCTL_ANTENNADIV_SHIFT)
+ & BCM43xx_TXHDRCTL_ANTENNADIV_MASK;
+
+ /* Set the FLAGS field */
+ if (!is_multicast_ether_addr(wireless_header->addr1) &&
+ !is_broadcast_ether_addr(wireless_header->addr1))
+ flags |= BCM43xx_TXHDRFLAG_EXPECTACK;
+ if (1 /* FIXME: PS poll?? */)
+ flags |= 0x10; // FIXME: unknown meaning.
+ if (fallback_ofdm_modulation)
+ flags |= BCM43xx_TXHDRFLAG_FALLBACKOFDM;
+ if (is_first_fragment)
+ flags |= BCM43xx_TXHDRFLAG_FIRSTFRAGMENT;
+
+ /* Set WSEC/RATE field */
+ wsec_rate |= (txhdr->plcp.raw[0] << BCM43xx_TXHDR_RATE_SHIFT)
+ & BCM43xx_TXHDR_RATE_MASK;
+
+ /* Generate the RTS/CTS packet, if required. */
+ /* FIXME: We should first try with CTS-to-self,
+ * if we are on 80211g. If we get too many
+ * failures (hidden nodes), we should switch back to RTS/CTS.
+ */
+ if (0/*FIXME txctl->use_rts_cts*/) {
+ bcm43xx_generate_rts(phy, txhdr, &flags,
+ 0/*FIXME txctl->rts_cts_rate*/,
+ wireless_header);
+ }
+
+ txhdr->flags = cpu_to_le16(flags);
+ txhdr->control = cpu_to_le16(control);
+ txhdr->wsec_rate = cpu_to_le16(wsec_rate);
+}
+
+static s8 bcm43xx_rssi_postprocess(struct bcm43xx_private *bcm,
+ u8 in_rssi, int ofdm,
+ int adjust_2053, int adjust_2050)
+{
+ struct bcm43xx_radioinfo *radio = bcm43xx_current_radio(bcm);
+ struct bcm43xx_phyinfo *phy = bcm43xx_current_phy(bcm);
+ s32 tmp;
+
+ switch (radio->version) {
+ case 0x2050:
+ if (ofdm) {
+ tmp = in_rssi;
+ if (tmp > 127)
+ tmp -= 256;
+ tmp *= 73;
+ tmp /= 64;
+ if (adjust_2050)
+ tmp += 25;
+ else
+ tmp -= 3;
+ } else {
+ if (bcm->sprom.boardflags & BCM43xx_BFL_RSSI) {
+ if (in_rssi > 63)
+ in_rssi = 63;
+ tmp = radio->nrssi_lt[in_rssi];
+ tmp = 31 - tmp;
+ tmp *= -131;
+ tmp /= 128;
+ tmp -= 57;
+ } else {
+ tmp = in_rssi;
+ tmp = 31 - tmp;
+ tmp *= -149;
+ tmp /= 128;
+ tmp -= 68;
+ }
+ if (phy->type == BCM43xx_PHYTYPE_G &&
+ adjust_2050)
+ tmp += 25;
+ }
+ break;
+ case 0x2060:
+ if (in_rssi > 127)
+ tmp = in_rssi - 256;
+ else
+ tmp = in_rssi;
+ break;
+ default:
+ tmp = in_rssi;
+ tmp -= 11;
+ tmp *= 103;
+ tmp /= 64;
+ if (adjust_2053)
+ tmp -= 109;
+ else
+ tmp -= 83;
+ }
+
+ return (s8)tmp;
+}
+
+//TODO
+#if 0
+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 = bcm43xx_rssi_postprocess(bcm, rxhdr->rssi, is_ofdm,
+ !!(rxflags1 & BCM43xx_RXHDR_FLAGS1_2053RSSIADJ),
+ !!(rxflags3 & BCM43xx_RXHDR_FLAGS3_2050RSSIADJ));
+ stats.signal = rxhdr->signal_quality; //FIXME
+//TODO stats.noise =
+ if (is_ofdm)
+ stats.rate = bcm43xx_plcp_get_bitrate_ofdm(plcp);
+ else
+ stats.rate = bcm43xx_plcp_get_bitrate_cck(plcp);
+//printk("RX ofdm %d, rate == %u\n", is_ofdm, stats.rate);
+ stats.received_channel = radio->channel;
+//TODO stats.control =
+ stats.mask = IEEE80211_STATMASK_SIGNAL |
+//TODO 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;
+ }
+
+ frame_ctl = le16_to_cpu(wlhdr->frame_ctl);
+ if ((frame_ctl & IEEE80211_FCTL_PROTECTED) && !bcm->ieee->host_decrypt) {
+ frame_ctl &= ~IEEE80211_FCTL_PROTECTED;
+ wlhdr->frame_ctl = cpu_to_le16(frame_ctl);
+ /* trim IV and ICV */
+ /* FIXME: this must be done only for WEP encrypted packets */
+ if (skb->len < 32) {
+ dprintkl(KERN_ERR PFX "RX packet dropped (PROTECTED flag "
+ "set and length < 32)\n");
+ return -EINVAL;
+ } else {
+ memmove(skb->data + 4, skb->data, 24);
+ skb_pull(skb, 4);
+ skb_trim(skb, skb->len - 4);
+ stats.len -= 8;
+ }
+ wlhdr = (struct ieee80211_hdr_4addr *)(skb->data);
+ }
+
+ 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;
+}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.