// SPDX-License-Identifier: GPL-2.0
/*
* Original code based Host AP (software wireless LAN access point) driver
* for Intersil Prism2/2.5/3 - hostap.o module, common routines
*
* Copyright (c) 2001-2002, SSH Communications Security Corp and Jouni Malinen
* <[email protected]>
* Copyright (c) 2002-2003, Jouni Malinen <[email protected]>
* Copyright (c) 2004, Intel Corporation
*
* Few modifications for Realtek's Wi-Fi drivers by
* Andrea Merello <[email protected]>
*
* A special thanks goes to Realtek for their support !
*/
#include <linux/compiler.h>
#include <linux/errno.h>
#include <linux/if_arp.h>
#include <linux/in6.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/pci.h>
#include <linux/proc_fs.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <linux/tcp.h>
#include <linux/types.h>
#include <linux/wireless.h>
#include <linux/etherdevice.h>
#include <linux/uaccess.h>
#include <linux/ctype.h>
#include "rtllib.h"
static void rtllib_rx_mgt(struct rtllib_device *ieee, struct sk_buff *skb,
struct rtllib_rx_stats *stats);
static inline void rtllib_monitor_rx(struct rtllib_device *ieee,
struct sk_buff *skb,
struct rtllib_rx_stats *rx_status,
size_t hdr_length)
{
skb->dev = ieee->dev;
skb_reset_mac_header(skb);
skb_pull(skb, hdr_length);
skb->pkt_type = PACKET_OTHERHOST;
skb->protocol = htons(ETH_P_80211_RAW);
memset(skb->cb, 0, sizeof(skb->cb));
netif_rx(skb);
}
/* Called only as a tasklet (software IRQ) */
static struct rtllib_frag_entry *
rtllib_frag_cache_find(struct rtllib_device *ieee, unsigned int seq,
unsigned int frag, u8 tid, u8 *src, u8 *dst)
{
struct rtllib_frag_entry *entry;
int i;
for (i = 0; i < RTLLIB_FRAG_CACHE_LEN; i++) {
entry = &ieee->frag_cache[tid][i];
if (entry->skb &&
time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
netdev_dbg(ieee->dev,
"expiring fragment cache entry seq=%u last_frag=%u\n",
entry->seq, entry->last_frag);
dev_kfree_skb_any(entry->skb);
entry->skb = NULL;
}
if (entry->skb && entry->seq == seq &&
(entry->last_frag + 1 == frag || frag == -1) &&
memcmp(entry->src_addr, src, ETH_ALEN) == 0 &&
memcmp(entry->dst_addr, dst, ETH_ALEN) == 0)
return entry;
}
return NULL;
}
/* Called only as a tasklet (software IRQ) */
static struct sk_buff *
rtllib_frag_cache_get(struct rtllib_device *ieee,
struct ieee80211_hdr *hdr)
{
struct sk_buff *skb = NULL;
u16 fc = le16_to_cpu(hdr->frame_control);
u16 sc = le16_to_cpu(hdr->seq_ctrl);
unsigned int frag = WLAN_GET_SEQ_FRAG(sc);
unsigned int seq = WLAN_GET_SEQ_SEQ(sc);
struct rtllib_frag_entry *entry;
struct ieee80211_qos_hdr *hdr_3addrqos;
struct ieee80211_qos_hdr_4addr *hdr_4addrqos;
u8 tid;
if (ieee80211_has_a4(hdr->frame_control) &&
RTLLIB_QOS_HAS_SEQ(fc)) {
hdr_4addrqos = (struct ieee80211_qos_hdr_4addr *)hdr;
tid = le16_to_cpu(hdr_4addrqos->qos_ctrl) & RTLLIB_QCTL_TID;
tid = UP2AC(tid);
tid++;
} else if (RTLLIB_QOS_HAS_SEQ(fc)) {
hdr_3addrqos = (struct ieee80211_qos_hdr *)hdr;
tid = le16_to_cpu(hdr_3addrqos->qos_ctrl) & RTLLIB_QCTL_TID;
tid = UP2AC(tid);
tid++;
} else {
tid = 0;
}
if (frag == 0) {
/* Reserve enough space to fit maximum frame length */
skb = dev_alloc_skb(ieee->dev->mtu +
sizeof(struct ieee80211_hdr) +
8 /* LLC */ +
2 /* alignment */ +
8 /* WEP */ +
ETH_ALEN /* WDS */ +
/* QOS Control */
(RTLLIB_QOS_HAS_SEQ(fc) ? 2 : 0));
if (!skb)
return NULL;
entry = &ieee->frag_cache[tid][ieee->frag_next_idx[tid]];
ieee->frag_next_idx[tid]++;
if (ieee->frag_next_idx[tid] >= RTLLIB_FRAG_CACHE_LEN)
ieee->frag_next_idx[tid] = 0;
if (entry->skb)
dev_kfree_skb_any(entry->skb);
entry->first_frag_time = jiffies;
entry->seq = seq;
entry->last_frag = frag;
entry->skb = skb;
ether_addr_copy(entry->src_addr, hdr->addr2);
ether_addr_copy(entry->dst_addr, hdr->addr1);
} else {
/* received a fragment of a frame for which the head fragment
* should have already been received
*/
entry = rtllib_frag_cache_find(ieee, seq, frag, tid, hdr->addr2,
hdr->addr1);
if (entry) {
entry->last_frag = frag;
skb = entry->skb;
}
}
return skb;
}
/* Called only as a tasklet (software IRQ) */
static int rtllib_frag_cache_invalidate(struct rtllib_device *ieee,
struct ieee80211_hdr *hdr)
{
u16 fc = le16_to_cpu(hdr->frame_control);
u16 sc = le16_to_cpu(hdr->seq_ctrl);
unsigned int seq = WLAN_GET_SEQ_SEQ(sc);
struct rtllib_frag_entry *entry;
struct ieee80211_qos_hdr *hdr_3addrqos;
struct ieee80211_qos_hdr_4addr *hdr_4addrqos;
u8 tid;
if (ieee80211_has_a4(hdr->frame_control) &&
RTLLIB_QOS_HAS_SEQ(fc)) {
hdr_4addrqos = (struct ieee80211_qos_hdr_4addr *)hdr;
tid = le16_to_cpu(hdr_4addrqos->qos_ctrl) & RTLLIB_QCTL_TID;
tid = UP2AC(tid);
tid++;
} else if (RTLLIB_QOS_HAS_SEQ(fc)) {
hdr_3addrqos = (struct ieee80211_qos_hdr *)hdr;
tid = le16_to_cpu(hdr_3addrqos->qos_ctrl) & RTLLIB_QCTL_TID;
tid = UP2AC(tid);
tid++;
} else {
tid = 0;
}
entry = rtllib_frag_cache_find(ieee, seq, -1, tid, hdr->addr2,
hdr->addr1);
if (!entry) {
netdev_dbg(ieee->dev,
"Couldn't invalidate fragment cache entry (seq=%u)\n",
seq);
return -1;
}
entry->skb = NULL;
return 0;
}
/* rtllib_rx_frame_mgtmt
*
* Responsible for handling management control frames
*
* Called by rtllib_rx
*/
static inline int
rtllib_rx_frame_mgmt(struct rtllib_device *ieee, struct sk_buff *skb,
struct rtllib_rx_stats *rx_stats, u16 type, u16 stype)
{
/* On the struct stats definition there is written that
* this is not mandatory.... but seems that the probe
* response parser uses it
*/
struct ieee80211_hdr_3addr *hdr = (struct ieee80211_hdr_3addr *)skb->data;
rx_stats->len = skb->len;
rtllib_rx_mgt(ieee, skb, rx_stats);
if ((memcmp(hdr->addr1, ieee->dev->dev_addr, ETH_ALEN))) {
dev_kfree_skb_any(skb);
return 0;
}
rtllib_rx_frame_softmac(ieee, skb, rx_stats, type, stype);
dev_kfree_skb_any(skb);
return 0;
}
/* No encapsulation header if EtherType < 0x600 (=length) */
/* Called by rtllib_rx_frame_decrypt */
static int rtllib_is_eapol_frame(struct rtllib_device *ieee,
struct sk_buff *skb, size_t hdrlen)
{
struct net_device *dev = ieee->dev;
u16 fc, ethertype;
struct ieee80211_hdr *hdr;
u8 *pos;
if (skb->len < 24)
return 0;
hdr = (struct ieee80211_hdr *)skb->data;
fc = le16_to_cpu(hdr->frame_control);
/* check that the frame is unicast frame to us */
if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
IEEE80211_FCTL_TODS &&
memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) == 0 &&
memcmp(hdr->addr3, dev->dev_addr, ETH_ALEN) == 0) {
/* ToDS frame with own addr BSSID and DA */
} else if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
IEEE80211_FCTL_FROMDS &&
memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) == 0) {
/* FromDS frame with own addr as DA */
} else {
return 0;
}
if (skb->len < 24 + 8)
return 0;
/* check for port access entity Ethernet type */
pos = skb->data + hdrlen;
ethertype = (pos[6] << 8) | pos[7];
if (ethertype == ETH_P_PAE)
return 1;
return 0;
}
/* Called only as a tasklet (software IRQ), by rtllib_rx */
static inline int
rtllib_rx_frame_decrypt(struct rtllib_device *ieee, struct sk_buff *skb,
struct lib80211_crypt_data *crypt)
{
struct ieee80211_hdr *hdr;
int res, hdrlen;
if (!crypt || !crypt->ops->decrypt_mpdu)
return 0;
if (ieee->hwsec_active) {
struct cb_desc *tcb_desc = (struct cb_desc *)
(skb->cb + MAX_DEV_ADDR_SIZE);
tcb_desc->hw_sec = 1;
if (ieee->need_sw_enc)
tcb_desc->hw_sec = 0;
}
hdr = (struct ieee80211_hdr *)skb->data;
hdrlen = rtllib_get_hdrlen(le16_to_cpu(hdr->frame_control));
atomic_inc(&crypt->refcnt);
res = crypt->ops->decrypt_mpdu(skb, hdrlen, crypt->priv);
atomic_dec(&crypt->refcnt);
if (res < 0) {
netdev_dbg(ieee->dev, "decryption failed (SA= %pM) res=%d\n",
hdr->addr2, res);
if (res == -2)
netdev_dbg(ieee->dev,
"Decryption failed ICV mismatch (key %d)\n",
skb->data[hdrlen + 3] >> 6);
return -1;
}
return res;
}
/* Called only as a tasklet (software IRQ), by rtllib_rx */
static inline int
rtllib_rx_frame_decrypt_msdu(struct rtllib_device *ieee, struct sk_buff *skb,
int keyidx, struct lib80211_crypt_data *crypt)
{
struct ieee80211_hdr *hdr;
int res, hdrlen;
if (!crypt || !crypt->ops->decrypt_msdu)
return 0;
if (ieee->hwsec_active) {
struct cb_desc *tcb_desc = (struct cb_desc *)
(skb->cb + MAX_DEV_ADDR_SIZE);
tcb_desc->hw_sec = 1;
if (ieee->need_sw_enc)
tcb_desc->hw_sec = 0;
}
hdr = (struct ieee80211_hdr *)skb->data;
hdrlen = rtllib_get_hdrlen(le16_to_cpu(hdr->frame_control));
atomic_inc(&crypt->refcnt);
res = crypt->ops->decrypt_msdu(skb, keyidx, hdrlen, crypt->priv);
atomic_dec(&crypt->refcnt);
if (res < 0) {
netdev_dbg(ieee->dev,
"MSDU decryption/MIC verification failed (SA= %pM keyidx=%d)\n",
hdr->addr2, keyidx);
return -1;
}
return 0;
}
/* this function is stolen from ipw2200 driver*/
#define IEEE_PACKET_RETRY_TIME (5 * HZ)
static int is_duplicate_packet(struct rtllib_device *ieee,
struct ieee80211_hdr *header)
{
u16 fc = le16_to_cpu(header->frame_control);
u16 sc = le16_to_cpu(header->seq_ctrl);
u16 seq = WLAN_GET_SEQ_SEQ(sc);
u16 frag = WLAN_GET_SEQ_FRAG(sc);
u16 *last_seq, *last_frag;
unsigned long *last_time;
struct ieee80211_qos_hdr *hdr_3addrqos;
struct ieee80211_qos_hdr_4addr *hdr_4addrqos;
u8 tid;
if (ieee80211_has_a4(header->frame_control) &&
RTLLIB_QOS_HAS_SEQ(fc)) {
hdr_4addrqos = (struct ieee80211_qos_hdr_4addr *)header;
tid = le16_to_cpu(hdr_4addrqos->qos_ctrl) & RTLLIB_QCTL_TID;
tid = UP2AC(tid);
tid++;
} else if (RTLLIB_QOS_HAS_SEQ(fc)) {
hdr_3addrqos = (struct ieee80211_qos_hdr *)header;
tid = le16_to_cpu(hdr_3addrqos->qos_ctrl) & RTLLIB_QCTL_TID;
tid = UP2AC(tid);
tid++;
} else {
tid = 0;
}
switch (ieee->iw_mode) {
case IW_MODE_INFRA:
last_seq = &ieee->last_rxseq_num[tid];
last_frag = &ieee->last_rxfrag_num[tid];
last_time = &ieee->last_packet_time[tid];
break;
default:
return 0;
}
if ((*last_seq == seq) &&
time_after(*last_time + IEEE_PACKET_RETRY_TIME, jiffies)) {
if (*last_frag == frag)
goto drop;
if (*last_frag + 1 != frag)
/* out-of-order fragment */
goto drop;
} else {
*last_seq = seq;
}
*last_frag = frag;
*last_time = jiffies;
return 0;
drop:
return 1;
}
static bool add_reorder_entry(struct rx_ts_record *ts,
struct rx_reorder_entry *reorder_entry)
{
struct list_head *list = &ts->rx_pending_pkt_list;
while (list->next != &ts->rx_pending_pkt_list) {
if (SN_LESS(reorder_entry->seq_num, ((struct rx_reorder_entry *)
list_entry(list->next, struct rx_reorder_entry,
list))->seq_num))
list = list->next;
else if (SN_EQUAL(reorder_entry->seq_num,
((struct rx_reorder_entry *)list_entry(list->next,
struct rx_reorder_entry, list))->seq_num))
return false;
else
break;
}
reorder_entry->list.next = list->next;
reorder_entry->list.next->prev = &reorder_entry->list;
reorder_entry->list.prev = list;
list->next = &reorder_entry->list;
return true;
}
void rtllib_indicate_packets(struct rtllib_device *ieee,
struct rtllib_rxb **prxb_indicate_array, u8 index)
{
struct net_device_stats *stats = &ieee->stats;
u8 i = 0, j = 0;
u16 ethertype;
for (j = 0; j < index; j++) {
struct rtllib_rxb *prxb = prxb_indicate_array[j];
for (i = 0; i < prxb->nr_subframes; i++) {
struct sk_buff *sub_skb = prxb->subframes[i];
/* convert hdr + possible LLC headers into Ethernet header */
ethertype = (sub_skb->data[6] << 8) | sub_skb->data[7];
if (sub_skb->len >= 8 &&
((memcmp(sub_skb->data, rfc1042_header,
SNAP_SIZE) == 0 &&
ethertype != ETH_P_AARP &&
ethertype != ETH_P_IPX) ||
memcmp(sub_skb->data, bridge_tunnel_header,
SNAP_SIZE) == 0)) {
/* remove RFC1042 or Bridge-Tunnel encapsulation
* and replace EtherType
*/
skb_pull(sub_skb, SNAP_SIZE);
memcpy(skb_push(sub_skb, ETH_ALEN), prxb->src, ETH_ALEN);
memcpy(skb_push(sub_skb, ETH_ALEN), prxb->dst, ETH_ALEN);
} else {
u16 len;
/* Leave Ethernet header part of hdr and full payload */
len = sub_skb->len;
memcpy(skb_push(sub_skb, 2), &len, 2);
memcpy(skb_push(sub_skb, ETH_ALEN), prxb->src, ETH_ALEN);
memcpy(skb_push(sub_skb, ETH_ALEN), prxb->dst, ETH_ALEN);
}
/* Indicate the packets to upper layer */
if (sub_skb) {
stats->rx_packets++;
stats->rx_bytes += sub_skb->len;
memset(sub_skb->cb, 0, sizeof(sub_skb->cb));
sub_skb->protocol = eth_type_trans(sub_skb,
ieee->dev);
sub_skb->dev = ieee->dev;
sub_skb->dev->stats.rx_packets++;
sub_skb->dev->stats.rx_bytes += sub_skb->len;
/* 802.11 crc not sufficient */
sub_skb->ip_summed = CHECKSUM_NONE;
ieee->last_rx_ps_time = jiffies;
netif_rx(sub_skb);
}
}
kfree(prxb);
prxb = NULL;
}
}
void rtllib_flush_rx_ts_pending_pkts(struct rtllib_device *ieee,
struct rx_ts_record *ts)
{
struct rx_reorder_entry *pRxReorderEntry;
u8 rfd_cnt = 0;
del_timer_sync(&ts->rx_pkt_pending_timer);
while (!list_empty(&ts->rx_pending_pkt_list)) {
if (rfd_cnt >= REORDER_WIN_SIZE) {
netdev_info(ieee->dev,
"-------------->%s() error! rfd_cnt >= REORDER_WIN_SIZE\n",
__func__);
break;
}
pRxReorderEntry = (struct rx_reorder_entry *)
list_entry(ts->rx_pending_pkt_list.prev,
struct rx_reorder_entry, list);
netdev_dbg(ieee->dev, "%s(): Indicate seq_num %d!\n", __func__,
pRxReorderEntry->seq_num);
list_del_init(&pRxReorderEntry->list);
ieee->rfd_array[rfd_cnt] = pRxReorderEntry->prxb;
rfd_cnt = rfd_cnt + 1;
list_add_tail(&pRxReorderEntry->list,
&ieee->RxReorder_Unused_List);
}
rtllib_indicate_packets(ieee, ieee->rfd_array, rfd_cnt);
ts->rx_indicate_seq = 0xffff;
}
static void rx_reorder_indicate_packet(struct rtllib_device *ieee,
struct rtllib_rxb *prxb,
struct rx_ts_record *ts, u16 seq_num)
{
struct rt_hi_throughput *ht_info = ieee->ht_info;
struct rx_reorder_entry *reorder_entry = NULL;
u8 win_size = ht_info->rx_reorder_win_size;
u16 win_end = 0;
u8 index = 0;
bool match_win_start = false, pkt_in_buf = false;
unsigned long flags;
netdev_dbg(ieee->dev,
"%s(): Seq is %d, ts->rx_indicate_seq is %d, win_size is %d\n",
__func__, seq_num, ts->rx_indicate_seq, win_size);
spin_lock_irqsave(&(ieee->reorder_spinlock), flags);
win_end = (ts->rx_indicate_seq + win_size - 1) % 4096;
/* Rx Reorder initialize condition.*/
if (ts->rx_indicate_seq == 0xffff)
ts->rx_indicate_seq = seq_num;
/* Drop out the packet which seq_num is smaller than WinStart */
if (SN_LESS(seq_num, ts->rx_indicate_seq)) {
netdev_dbg(ieee->dev,
"Packet Drop! IndicateSeq: %d, NewSeq: %d\n",
ts->rx_indicate_seq, seq_num);
ht_info->rx_reorder_drop_counter++;
{
int i;
for (i = 0; i < prxb->nr_subframes; i++)
dev_kfree_skb(prxb->subframes[i]);
kfree(prxb);
prxb = NULL;
}
spin_unlock_irqrestore(&(ieee->reorder_spinlock), flags);
return;
}
/* Sliding window manipulation. Conditions includes:
* 1. Incoming seq_num is equal to WinStart =>Window shift 1
* 2. Incoming seq_num is larger than the win_end => Window shift N
*/
if (SN_EQUAL(seq_num, ts->rx_indicate_seq)) {
ts->rx_indicate_seq = (ts->rx_indicate_seq + 1) % 4096;
match_win_start = true;
} else if (SN_LESS(win_end, seq_num)) {
if (seq_num >= (win_size - 1))
ts->rx_indicate_seq = seq_num + 1 - win_size;
else
ts->rx_indicate_seq = 4095 -
(win_size - (seq_num + 1)) + 1;
netdev_dbg(ieee->dev,
"Window Shift! IndicateSeq: %d, NewSeq: %d\n",
ts->rx_indicate_seq, seq_num);
}
/* Indication process.
* After Packet dropping and Sliding Window shifting as above, we can
* now just indicate the packets with the seq_num smaller than latest
* WinStart and struct buffer other packets.
*
* For Rx Reorder condition:
* 1. All packets with seq_num smaller than WinStart => Indicate
* 2. All packets with seq_num larger than or equal to
* WinStart => Buffer it.
*/
if (match_win_start) {
/* Current packet is going to be indicated.*/
netdev_dbg(ieee->dev,
"Packets indication! IndicateSeq: %d, NewSeq: %d\n",
ts->rx_indicate_seq, seq_num);
ieee->prxb_indicate_array[0] = prxb;
index = 1;
} else {
/* Current packet is going to be inserted into pending list.*/
if (!list_empty(&ieee->RxReorder_Unused_List)) {
reorder_entry = (struct rx_reorder_entry *)
list_entry(ieee->RxReorder_Unused_List.next,
struct rx_reorder_entry, list);
list_del_init(&reorder_entry->list);
/* Make a reorder entry and insert
* into a the packet list.
*/
reorder_entry->seq_num = seq_num;
reorder_entry->prxb = prxb;
if (!add_reorder_entry(ts, reorder_entry)) {
int i;
netdev_dbg(ieee->dev,
"%s(): Duplicate packet is dropped. IndicateSeq: %d, NewSeq: %d\n",
__func__, ts->rx_indicate_seq,
seq_num);
list_add_tail(&reorder_entry->list,
&ieee->RxReorder_Unused_List);
for (i = 0; i < prxb->nr_subframes; i++)
dev_kfree_skb(prxb->subframes[i]);
kfree(prxb);
prxb = NULL;
} else {
netdev_dbg(ieee->dev,
"Pkt insert into struct buffer. IndicateSeq: %d, NewSeq: %d\n",
ts->rx_indicate_seq, seq_num);
}
} else {
/* Packets are dropped if there are not enough reorder
* entries. This part should be modified!! We can just
* indicate all the packets in struct buffer and get
* reorder entries.
*/
netdev_err(ieee->dev,
"%s(): There is no reorder entry! Packet is dropped!\n",
__func__);
{
int i;
for (i = 0; i < prxb->nr_subframes; i++)
dev_kfree_skb(prxb->subframes[i]);
kfree(prxb);
prxb = NULL;
}
}
}
/* Check if there is any packet need indicate.*/
while (!list_empty(&ts->rx_pending_pkt_list)) {
netdev_dbg(ieee->dev, "%s(): start RREORDER indicate\n",
__func__);
reorder_entry = (struct rx_reorder_entry *)
list_entry(ts->rx_pending_pkt_list.prev,
struct rx_reorder_entry,
list);
if (SN_LESS(reorder_entry->seq_num, ts->rx_indicate_seq) ||
SN_EQUAL(reorder_entry->seq_num, ts->rx_indicate_seq)) {
/* This protect struct buffer from overflow. */
if (index >= REORDER_WIN_SIZE) {
netdev_err(ieee->dev,
"%s(): Buffer overflow!\n",
__func__);
pkt_in_buf = true;
break;
}
list_del_init(&reorder_entry->list);
if (SN_EQUAL(reorder_entry->seq_num, ts->rx_indicate_seq))
ts->rx_indicate_seq = (ts->rx_indicate_seq + 1) %
4096;
ieee->prxb_indicate_array[index] = reorder_entry->prxb;
netdev_dbg(ieee->dev, "%s(): Indicate seq_num %d!\n",
__func__, reorder_entry->seq_num);
index++;
list_add_tail(&reorder_entry->list,
&ieee->RxReorder_Unused_List);
} else {
pkt_in_buf = true;
break;
}
}
/* Handling pending timer. Set this timer to prevent from long time
* Rx buffering.
*/
if (index > 0) {
spin_unlock_irqrestore(&ieee->reorder_spinlock, flags);
if (timer_pending(&ts->rx_pkt_pending_timer))
del_timer_sync(&ts->rx_pkt_pending_timer);
spin_lock_irqsave(&ieee->reorder_spinlock, flags);
ts->rx_timeout_indicate_seq = 0xffff;
if (index > REORDER_WIN_SIZE) {
netdev_err(ieee->dev,
"%s(): Rx Reorder struct buffer full!\n",
__func__);
spin_unlock_irqrestore(&(ieee->reorder_spinlock),
flags);
return;
}
rtllib_indicate_packets(ieee, ieee->prxb_indicate_array, index);
pkt_in_buf = false;
}
if (pkt_in_buf && ts->rx_timeout_indicate_seq == 0xffff) {
netdev_dbg(ieee->dev, "%s(): SET rx timeout timer\n", __func__);
ts->rx_timeout_indicate_seq = ts->rx_indicate_seq;
spin_unlock_irqrestore(&ieee->reorder_spinlock, flags);
mod_timer(&ts->rx_pkt_pending_timer, jiffies +
msecs_to_jiffies(ht_info->rx_reorder_pending_time));
spin_lock_irqsave(&ieee->reorder_spinlock, flags);
}
spin_unlock_irqrestore(&(ieee->reorder_spinlock), flags);
}
static u8 parse_subframe(struct rtllib_device *ieee, struct sk_buff *skb,
struct rtllib_rx_stats *rx_stats,
struct rtllib_rxb *rxb, u8 *src, u8 *dst)
{
struct ieee80211_hdr_3addr *hdr = (struct ieee80211_hdr_3addr *)skb->data;
u16 fc = le16_to_cpu(hdr->frame_control);
u16 llc_offset = sizeof(struct ieee80211_hdr_3addr);
bool is_aggregate_frame = false;
u16 subframe_len;
u8 pad_len = 0;
u16 seq_num = 0;
struct sk_buff *sub_skb;
/* just for debug purpose */
seq_num = WLAN_GET_SEQ_SEQ(le16_to_cpu(hdr->seq_ctrl));
if ((RTLLIB_QOS_HAS_SEQ(fc)) &&
(((union frameqos *)(skb->data + RTLLIB_3ADDR_LEN))->field.reserved))
is_aggregate_frame = true;
if (RTLLIB_QOS_HAS_SEQ(fc))
llc_offset += 2;
if (rx_stats->contain_htc)
llc_offset += sHTCLng;
if (skb->len <= llc_offset)
return 0;
skb_pull(skb, llc_offset);
ieee->is_aggregate_frame = is_aggregate_frame;
if (!is_aggregate_frame) {
rxb->nr_subframes = 1;
/* altered by clark 3/30/2010
* The struct buffer size of the skb indicated to upper layer
* must be less than 5000, or the defraged IP datagram
* in the IP layer will exceed "ipfrag_high_tresh" and be
* discarded. so there must not use the function
* "skb_copy" and "skb_clone" for "skb".
*/
/* Allocate new skb for releasing to upper layer */
sub_skb = dev_alloc_skb(RTLLIB_SKBBUFFER_SIZE);
if (!sub_skb)
return 0;
skb_reserve(sub_skb, 12);
skb_put_data(sub_skb, skb->data, skb->len);
sub_skb->dev = ieee->dev;
rxb->subframes[0] = sub_skb;
memcpy(rxb->src, src, ETH_ALEN);
memcpy(rxb->dst, dst, ETH_ALEN);
rxb->subframes[0]->dev = ieee->dev;
return 1;
}
rxb->nr_subframes = 0;
memcpy(rxb->src, src, ETH_ALEN);
memcpy(rxb->dst, dst, ETH_ALEN);
while (skb->len > ETHERNET_HEADER_SIZE) {
/* Offset 12 denote 2 mac address */
subframe_len = *((u16 *)(skb->data + 12));
subframe_len = (subframe_len >> 8) +
(subframe_len << 8);
if (skb->len < (ETHERNET_HEADER_SIZE + subframe_len)) {
netdev_info(ieee->dev,
"%s: A-MSDU parse error!! pRfd->nTotalSubframe : %d\n",
__func__, rxb->nr_subframes);
netdev_info(ieee->dev,
"%s: A-MSDU parse error!! Subframe Length: %d\n",
__func__, subframe_len);
netdev_info(ieee->dev,
"nRemain_Length is %d and subframe_len is : %d\n",
skb->len, subframe_len);
netdev_info(ieee->dev,
"The Packet seq_num is %d\n",
seq_num);
return 0;
}
/* move the data point to data content */
skb_pull(skb, ETHERNET_HEADER_SIZE);
/* altered by clark 3/30/2010
* The struct buffer size of the skb indicated to upper layer
* must be less than 5000, or the defraged IP datagram
* in the IP layer will exceed "ipfrag_high_tresh" and be
* discarded. so there must not use the function
* "skb_copy" and "skb_clone" for "skb".
*/
/* Allocate new skb for releasing to upper layer */
sub_skb = dev_alloc_skb(subframe_len + 12);
if (!sub_skb)
return 0;
skb_reserve(sub_skb, 12);
skb_put_data(sub_skb, skb->data, subframe_len);
sub_skb->dev = ieee->dev;
rxb->subframes[rxb->nr_subframes++] = sub_skb;
if (rxb->nr_subframes >= MAX_SUBFRAME_COUNT) {
netdev_dbg(ieee->dev,
"ParseSubframe(): Too many Subframes! Packets dropped!\n");
break;
}
skb_pull(skb, subframe_len);
if (skb->len != 0) {
pad_len = 4 - ((subframe_len +
ETHERNET_HEADER_SIZE) % 4);
if (pad_len == 4)
pad_len = 0;
if (skb->len < pad_len)
return 0;
skb_pull(skb, pad_len);
}
}
return rxb->nr_subframes;
}
static size_t rtllib_rx_get_hdrlen(struct rtllib_device *ieee,
struct sk_buff *skb,
struct rtllib_rx_stats *rx_stats)
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
u16 fc = le16_to_cpu(hdr->frame_control);
size_t hdrlen;
hdrlen = rtllib_get_hdrlen(fc);
if (ht_c_check(ieee, skb->data)) {
if (net_ratelimit())
netdev_info(ieee->dev, "%s: find HTCControl!\n",
__func__);
hdrlen += 4;
rx_stats->contain_htc = true;
}
return hdrlen;
}
static int rtllib_rx_check_duplicate(struct rtllib_device *ieee,
struct sk_buff *skb, u8 multicast)
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
u16 fc, sc;
u8 frag;
fc = le16_to_cpu(hdr->frame_control);
sc = le16_to_cpu(hdr->seq_ctrl);
frag = WLAN_GET_SEQ_FRAG(sc);
if (!ieee->ht_info->cur_rx_reorder_enable ||
!ieee->current_network.qos_data.active ||
!is_data_frame(skb->data) ||
is_legacy_data_frame(skb->data)) {
if (!ieee80211_is_beacon(hdr->frame_control)) {
if (is_duplicate_packet(ieee, hdr))
return -1;
}
} else {
struct rx_ts_record *ts = NULL;
if (rtllib_get_ts(ieee, (struct ts_common_info **)&ts, hdr->addr2,
(u8)frame_qos_tid((u8 *)(skb->data)), RX_DIR, true)) {
if ((fc & (1 << 11)) && (frag == ts->rx_last_frag_num) &&
(WLAN_GET_SEQ_SEQ(sc) == ts->rx_last_seq_num))
return -1;
ts->rx_last_frag_num = frag;
ts->rx_last_seq_num = WLAN_GET_SEQ_SEQ(sc);
} else {
netdev_warn(ieee->dev, "%s(): No TS! Skip the check!\n",
__func__);
return -1;
}
}
return 0;
}
static void rtllib_rx_extract_addr(struct rtllib_device *ieee,
struct ieee80211_hdr *hdr, u8 *dst,
u8 *src, u8 *bssid)
{
u16 fc = le16_to_cpu(hdr->frame_control);
switch (fc & (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) {
case IEEE80211_FCTL_FROMDS:
ether_addr_copy(dst, hdr->addr1);
ether_addr_copy(src, hdr->addr3);
ether_addr_copy(bssid, hdr->addr2);
break;
case IEEE80211_FCTL_TODS:
ether_addr_copy(dst, hdr->addr3);
ether_addr_copy(src, hdr->addr2);
ether_addr_copy(bssid, hdr->addr1);
break;
case IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS:
ether_addr_copy(dst, hdr->addr3);
ether_addr_copy(src, hdr->addr4);
ether_addr_copy(bssid, ieee->current_network.bssid);
break;
default:
ether_addr_copy(dst, hdr->addr1);
ether_addr_copy(src, hdr->addr2);
ether_addr_copy(bssid, hdr->addr3);
break;
}
}
static int rtllib_rx_data_filter(struct rtllib_device *ieee, struct ieee80211_hdr *hdr,
u8 *dst, u8 *src, u8 *bssid, u8 *addr2)
{
u16 fc = le16_to_cpu(hdr->frame_control);
u8 type = WLAN_FC_GET_TYPE(fc);
u8 stype = WLAN_FC_GET_STYPE(fc);
/* Filter frames from different BSS */
if (ieee80211_has_a4(hdr->frame_control) &&
!ether_addr_equal(ieee->current_network.bssid, bssid) &&
!is_zero_ether_addr(ieee->current_network.bssid)) {
return -1;
}
/* Nullfunc frames may have PS-bit set, so they must be passed to
* hostap_handle_sta_rx() before being dropped here.
*/
if (stype != IEEE80211_STYPE_DATA &&
stype != IEEE80211_STYPE_DATA_CFACK &&
stype != IEEE80211_STYPE_DATA_CFPOLL &&
stype != IEEE80211_STYPE_DATA_CFACKPOLL &&
stype != IEEE80211_STYPE_QOS_DATA) {
if (stype != IEEE80211_STYPE_NULLFUNC)
netdev_dbg(ieee->dev,
"RX: dropped data frame with no data (type=0x%02x, subtype=0x%02x)\n",
type, stype);
return -1;
}
/* packets from our adapter are dropped (echo) */
if (!memcmp(src, ieee->dev->dev_addr, ETH_ALEN))
return -1;
/* {broad,multi}cast packets to our BSS go through */
if (is_multicast_ether_addr(dst)) {
if (memcmp(bssid, ieee->current_network.bssid,
ETH_ALEN))
return -1;
}
return 0;
}
static int rtllib_rx_get_crypt(struct rtllib_device *ieee, struct sk_buff *skb,
struct lib80211_crypt_data **crypt, size_t hdrlen)
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
u16 fc = le16_to_cpu(hdr->frame_control);
int idx = 0;
if (skb->len >= hdrlen + 3)
idx = skb->data[hdrlen + 3] >> 6;
*crypt = ieee->crypt_info.crypt[idx];
/* allow NULL decrypt to indicate an station specific override
* for default encryption
*/
if (*crypt && (!(*crypt)->ops || !(*crypt)->ops->decrypt_mpdu))
*crypt = NULL;
if (!*crypt && (fc & IEEE80211_FCTL_PROTECTED)) {
/* This seems to be triggered by some (multicast?)
* frames from other than current BSS, so just drop the
* frames silently instead of filling system log with
* these reports.
*/
netdev_dbg(ieee->dev,
"Decryption failed (not set) (SA= %pM)\n",
hdr->addr2);
return -1;
}
return 0;
}
static int rtllib_rx_decrypt(struct rtllib_device *ieee, struct sk_buff *skb,
struct rtllib_rx_stats *rx_stats,
struct lib80211_crypt_data *crypt, size_t hdrlen)
{
struct ieee80211_hdr *hdr;
int keyidx = 0;
u16 fc, sc;
u8 frag;
hdr = (struct ieee80211_hdr *)skb->data;
fc = le16_to_cpu(hdr->frame_control);
sc = le16_to_cpu(hdr->seq_ctrl);
frag = WLAN_GET_SEQ_FRAG(sc);
if ((!rx_stats->decrypted))
ieee->need_sw_enc = 1;
else
ieee->need_sw_enc = 0;
keyidx = rtllib_rx_frame_decrypt(ieee, skb, crypt);
if ((fc & IEEE80211_FCTL_PROTECTED) && (keyidx < 0)) {
netdev_info(ieee->dev, "%s: decrypt frame error\n", __func__);
return -1;
}
hdr = (struct ieee80211_hdr *)skb->data;
if ((frag != 0 || (fc & IEEE80211_FCTL_MOREFRAGS))) {
int flen;
struct sk_buff *frag_skb = rtllib_frag_cache_get(ieee, hdr);
netdev_dbg(ieee->dev, "Rx Fragment received (%u)\n", frag);
if (!frag_skb) {
netdev_dbg(ieee->dev,
"Rx cannot get skb from fragment cache (morefrag=%d seq=%u frag=%u)\n",
(fc & IEEE80211_FCTL_MOREFRAGS) != 0,
WLAN_GET_SEQ_SEQ(sc), frag);
return -1;
}
flen = skb->len;
if (frag != 0)
flen -= hdrlen;
if (frag_skb->tail + flen > frag_skb->end) {
netdev_warn(ieee->dev,
"%s: host decrypted and reassembled frame did not fit skb\n",
__func__);
rtllib_frag_cache_invalidate(ieee, hdr);
return -1;
}
if (frag == 0) {
/* copy first fragment (including full headers) into
* beginning of the fragment cache skb
*/
skb_put_data(frag_skb, skb->data, flen);
} else {
/* append frame payload to the end of the fragment
* cache skb
*/
skb_put_data(frag_skb, skb->data + hdrlen, flen);
}
dev_kfree_skb_any(skb);
skb = NULL;
if (fc & IEEE80211_FCTL_MOREFRAGS) {
/* more fragments expected - leave the skb in fragment
* cache for now; it will be delivered to upper layers
* after all fragments have been received
*/
return -2;
}
/* this was the last fragment and the frame will be
* delivered, so remove skb from fragment cache
*/
skb = frag_skb;
hdr = (struct ieee80211_hdr *)skb->data;
rtllib_frag_cache_invalidate(ieee, hdr);
}
/* skb: hdr + (possible reassembled) full MSDU payload; possibly still
* encrypted/authenticated
*/
if ((fc & IEEE80211_FCTL_PROTECTED) &&
rtllib_rx_frame_decrypt_msdu(ieee, skb, keyidx, crypt)) {
netdev_info(ieee->dev, "%s: ==>decrypt msdu error\n", __func__);
return -1;
}
hdr = (struct ieee80211_hdr *)skb->data;
if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep) {
if (/*ieee->ieee802_1x &&*/
rtllib_is_eapol_frame(ieee, skb, hdrlen)) {
/* pass unencrypted EAPOL frames even if encryption is
* configured
*/
struct eapol *eap = (struct eapol *)(skb->data +
24);
netdev_dbg(ieee->dev,
"RX: IEEE 802.1X EAPOL frame: %s\n",
eap_get_type(eap->type));
} else {
netdev_dbg(ieee->dev,
"encryption configured, but RX frame not encrypted (SA= %pM)\n",
hdr->addr2);
return -1;
}
}
if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) &&
rtllib_is_eapol_frame(ieee, skb, hdrlen)) {
struct eapol *eap = (struct eapol *)(skb->data + 24);
netdev_dbg(ieee->dev, "RX: IEEE 802.1X EAPOL frame: %s\n",
eap_get_type(eap->type));
}
if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep &&
!rtllib_is_eapol_frame(ieee, skb, hdrlen)) {
netdev_dbg(ieee->dev,
"dropped unencrypted RX data frame from %pM (drop_unencrypted=1)\n",
hdr->addr2);
return -1;
}
return 0;
}
static void rtllib_rx_check_leave_lps(struct rtllib_device *ieee, u8 unicast,
u8 nr_subframes)
{
if (unicast) {
if (ieee->link_state == MAC80211_LINKED) {
if (((ieee->link_detect_info.num_rx_unicast_ok_in_period +
ieee->link_detect_info.num_tx_ok_in_period) > 8) ||
(ieee->link_detect_info.num_rx_unicast_ok_in_period > 2)) {
ieee->leisure_ps_leave(ieee->dev);
}
}
}
ieee->last_rx_ps_time = jiffies;
}
static void rtllib_rx_indicate_pkt_legacy(struct rtllib_device *ieee,
struct rtllib_rx_stats *rx_stats,
struct rtllib_rxb *rxb,
u8 *dst,
u8 *src)
{
struct net_device *dev = ieee->dev;
u16 ethertype;
int i = 0;
if (!rxb) {
netdev_info(dev, "%s: rxb is NULL!!\n", __func__);
return;
}
for (i = 0; i < rxb->nr_subframes; i++) {
struct sk_buff *sub_skb = rxb->subframes[i];
if (sub_skb) {
/* convert hdr + possible LLC headers
* into Ethernet header
*/
ethertype = (sub_skb->data[6] << 8) | sub_skb->data[7];
if (sub_skb->len >= 8 &&
((memcmp(sub_skb->data, rfc1042_header, SNAP_SIZE) == 0 &&
ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
memcmp(sub_skb->data, bridge_tunnel_header, SNAP_SIZE) == 0)) {
/* remove RFC1042 or Bridge-Tunnel encapsulation
* and replace EtherType
*/
skb_pull(sub_skb, SNAP_SIZE);
ether_addr_copy(skb_push(sub_skb, ETH_ALEN),
src);
ether_addr_copy(skb_push(sub_skb, ETH_ALEN),
dst);
} else {
u16 len;
/* Leave Ethernet header part of hdr
* and full payload
*/
len = sub_skb->len;
memcpy(skb_push(sub_skb, 2), &len, 2);
ether_addr_copy(skb_push(sub_skb, ETH_ALEN),
src);
ether_addr_copy(skb_push(sub_skb, ETH_ALEN),
dst);
}
ieee->stats.rx_packets++;
ieee->stats.rx_bytes += sub_skb->len;
if (is_multicast_ether_addr(dst))
ieee->stats.multicast++;
/* Indicate the packets to upper layer */
memset(sub_skb->cb, 0, sizeof(sub_skb->cb));
sub_skb->protocol = eth_type_trans(sub_skb, dev);
sub_skb->dev = dev;
sub_skb->dev->stats.rx_packets++;
sub_skb->dev->stats.rx_bytes += sub_skb->len;
/* 802.11 crc not sufficient */
sub_skb->ip_summed = CHECKSUM_NONE;
netif_rx(sub_skb);
}
}
kfree(rxb);
}
static int rtllib_rx_infra_adhoc(struct rtllib_device *ieee, struct sk_buff *skb,
struct rtllib_rx_stats *rx_stats)
{
struct net_device *dev = ieee->dev;
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
struct lib80211_crypt_data *crypt = NULL;
struct rtllib_rxb *rxb = NULL;
struct rx_ts_record *ts = NULL;
u16 fc, sc, seq_num = 0;
u8 type, stype, multicast = 0, unicast = 0, nr_subframes = 0, TID = 0;
u8 dst[ETH_ALEN];
u8 src[ETH_ALEN];
u8 bssid[ETH_ALEN] = {0};
size_t hdrlen = 0;
int ret = 0, i = 0;
fc = le16_to_cpu(hdr->frame_control);
type = WLAN_FC_GET_TYPE(fc);
stype = WLAN_FC_GET_STYPE(fc);
sc = le16_to_cpu(hdr->seq_ctrl);
/*Filter pkt not to me*/
multicast = is_multicast_ether_addr(hdr->addr1);
unicast = !multicast;
if (unicast && !ether_addr_equal(dev->dev_addr, hdr->addr1))
goto rx_dropped;
/*Filter pkt has too small length */
hdrlen = rtllib_rx_get_hdrlen(ieee, skb, rx_stats);
if (skb->len < hdrlen) {
netdev_info(dev,
"%s():ERR!!! skb->len is smaller than hdrlen\n",
__func__);
goto rx_dropped;
}
/* Filter Duplicate pkt */
ret = rtllib_rx_check_duplicate(ieee, skb, multicast);
if (ret < 0)
goto rx_dropped;
/* Filter CTRL Frame */
if (type == RTLLIB_FTYPE_CTL)
goto rx_dropped;
/* Filter MGNT Frame */
if (type == RTLLIB_FTYPE_MGMT) {
if (rtllib_rx_frame_mgmt(ieee, skb, rx_stats, type, stype))
goto rx_dropped;
else
goto rx_exit;
}
/* Filter WAPI DATA Frame */
/* Update statstics for AP roaming */
ieee->link_detect_info.num_recv_data_in_period++;
ieee->link_detect_info.num_rx_ok_in_period++;
/* Data frame - extract src/dst addresses */
rtllib_rx_extract_addr(ieee, hdr, dst, src, bssid);
/* Filter Data frames */
ret = rtllib_rx_data_filter(ieee, hdr, dst, src, bssid, hdr->addr2);
if (ret < 0)
goto rx_dropped;
if (skb->len == hdrlen)
goto rx_dropped;
/* Send pspoll based on moredata */
if ((ieee->iw_mode == IW_MODE_INFRA) &&
(ieee->sta_sleep == LPS_IS_SLEEP) &&
(ieee->polling)) {
if (WLAN_FC_MORE_DATA(fc)) {
/* more data bit is set, let's request a new frame
* from the AP
*/
rtllib_sta_ps_send_pspoll_frame(ieee);
} else {
ieee->polling = false;
}
}
/* Get crypt if encrypted */
ret = rtllib_rx_get_crypt(ieee, skb, &crypt, hdrlen);
if (ret == -1)
goto rx_dropped;
/* Decrypt data frame (including reassemble) */
ret = rtllib_rx_decrypt(ieee, skb, rx_stats, crypt, hdrlen);
if (ret == -1)
goto rx_dropped;
else if (ret == -2)
goto rx_exit;
/* Get TS for Rx Reorder */
hdr = (struct ieee80211_hdr *)skb->data;
if (ieee->current_network.qos_data.active && is_qos_data_frame(skb->data)
&& !is_multicast_ether_addr(hdr->addr1)) {
TID = frame_qos_tid(skb->data);
seq_num = WLAN_GET_SEQ_SEQ(sc);
rtllib_get_ts(ieee, (struct ts_common_info **)&ts, hdr->addr2, TID,
RX_DIR, true);
if (TID != 0 && TID != 3)
ieee->bis_any_nonbepkts = true;
}
/* Parse rx data frame (For AMSDU) */
/* skb: hdr + (possible reassembled) full plaintext payload */
rxb = kmalloc(sizeof(struct rtllib_rxb), GFP_ATOMIC);
if (!rxb)
goto rx_dropped;
/* to parse amsdu packets */
/* qos data packets & reserved bit is 1 */
if (parse_subframe(ieee, skb, rx_stats, rxb, src, dst) == 0) {
/* only to free rxb, and not submit the packets
* to upper layer
*/
for (i = 0; i < rxb->nr_subframes; i++)
dev_kfree_skb(rxb->subframes[i]);
kfree(rxb);
rxb = NULL;
goto rx_dropped;
}
/* Update WAPI PN */
/* Check if leave LPS */
if (ieee->is_aggregate_frame)
nr_subframes = rxb->nr_subframes;
else
nr_subframes = 1;
if (unicast)
ieee->link_detect_info.num_rx_unicast_ok_in_period += nr_subframes;
rtllib_rx_check_leave_lps(ieee, unicast, nr_subframes);
/* Indicate packets to upper layer or Rx Reorder */
if (!ieee->ht_info->cur_rx_reorder_enable || !ts)
rtllib_rx_indicate_pkt_legacy(ieee, rx_stats, rxb, dst, src);
else
rx_reorder_indicate_packet(ieee, rxb, ts, seq_num);
dev_kfree_skb(skb);
rx_exit:
return 1;
rx_dropped:
ieee->stats.rx_dropped++;
/* Returning 0 indicates to caller that we have not handled the SKB--
* so it is still allocated and can be used again by underlying
* hardware as a DMA target
*/
return 0;
}
static int rtllib_rx_monitor(struct rtllib_device *ieee, struct sk_buff *skb,
struct rtllib_rx_stats *rx_stats)
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
u16 fc = le16_to_cpu(hdr->frame_control);
size_t hdrlen = rtllib_get_hdrlen(fc);
if (skb->len < hdrlen) {
netdev_info(ieee->dev,
"%s():ERR!!! skb->len is smaller than hdrlen\n",
__func__);
return 0;
}
if (ht_c_check(ieee, skb->data)) {
if (net_ratelimit())
netdev_info(ieee->dev, "%s: Find HTCControl!\n",
__func__);
hdrlen += 4;
}
ieee->stats.rx_packets++;
ieee->stats.rx_bytes += skb->len;
rtllib_monitor_rx(ieee, skb, rx_stats, hdrlen);
return 1;
}
/* All received frames are sent to this function. @skb contains the frame in
* IEEE 802.11 format, i.e., in the format it was sent over air.
* This function is called only as a tasklet (software IRQ).
*/
int rtllib_rx(struct rtllib_device *ieee, struct sk_buff *skb,
struct rtllib_rx_stats *rx_stats)
{
int ret = 0;
if (!ieee || !skb || !rx_stats) {
pr_info("%s: Input parameters NULL!\n", __func__);
goto rx_dropped;
}
if (skb->len < 10) {
netdev_info(ieee->dev, "%s: SKB length < 10\n", __func__);
goto rx_dropped;
}
switch (ieee->iw_mode) {
case IW_MODE_INFRA:
ret = rtllib_rx_infra_adhoc(ieee, skb, rx_stats);
break;
case IW_MODE_MONITOR:
ret = rtllib_rx_monitor(ieee, skb, rx_stats);
break;
default:
netdev_info(ieee->dev, "%s: ERR iw mode!!!\n", __func__);
break;
}
return ret;
rx_dropped:
if (ieee)
ieee->stats.rx_dropped++;
return 0;
}
EXPORT_SYMBOL(rtllib_rx);
static u8 qos_oui[QOS_OUI_LEN] = { 0x00, 0x50, 0xF2 };
/* Make ther structure we read from the beacon packet has the right values */
static int rtllib_verify_qos_info(struct rtllib_qos_information_element
*info_element, int sub_type)
{
if (info_element->element_id != QOS_ELEMENT_ID)
return -1;
if (info_element->qui_subtype != sub_type)
return -1;
if (memcmp(info_element->qui, qos_oui, QOS_OUI_LEN))
return -1;
if (info_element->qui_type != QOS_OUI_TYPE)
return -1;
if (info_element->version != QOS_VERSION_1)
return -1;
return 0;
}
/* Parse a QoS parameter element */
static int rtllib_read_qos_param_element(
struct rtllib_qos_parameter_info *element_param,
struct rtllib_info_element *info_element)
{
size_t size = sizeof(*element_param);
if (!element_param || !info_element || info_element->len != size - 2)
return -1;
memcpy(element_param, info_element, size);
return rtllib_verify_qos_info(&element_param->info_element,
QOS_OUI_PARAM_SUB_TYPE);
}
/* Parse a QoS information element */
static int rtllib_read_qos_info_element(
struct rtllib_qos_information_element *element_info,
struct rtllib_info_element *info_element)
{
size_t size = sizeof(*element_info);
if (!element_info || !info_element || info_element->len != size - 2)
return -1;
memcpy(element_info, info_element, size);
return rtllib_verify_qos_info(element_info, QOS_OUI_INFO_SUB_TYPE);
}
/* Write QoS parameters from the ac parameters. */
static int rtllib_qos_convert_ac_to_parameters(struct rtllib_qos_parameter_info *param_elm,
struct rtllib_qos_data *qos_data)
{
struct rtllib_qos_ac_parameter *ac_params;
struct rtllib_qos_parameters *qos_param = &(qos_data->parameters);
int i;
u8 aci;
u8 acm;
qos_data->wmm_acm = 0;
for (i = 0; i < QOS_QUEUE_NUM; i++) {
ac_params = &(param_elm->ac_params_record[i]);
aci = (ac_params->aci_aifsn & 0x60) >> 5;
acm = (ac_params->aci_aifsn & 0x10) >> 4;
if (aci >= QOS_QUEUE_NUM)
continue;
switch (aci) {
case 1:
/* BIT(0) | BIT(3) */
if (acm)
qos_data->wmm_acm |= (0x01 << 0) | (0x01 << 3);
break;
case 2:
/* BIT(4) | BIT(5) */
if (acm)
qos_data->wmm_acm |= (0x01 << 4) | (0x01 << 5);
break;
case 3:
/* BIT(6) | BIT(7) */
if (acm)
qos_data->wmm_acm |= (0x01 << 6) | (0x01 << 7);
break;
case 0:
default:
/* BIT(1) | BIT(2) */
if (acm)
qos_data->wmm_acm |= (0x01 << 1) | (0x01 << 2);
break;
}
qos_param->aifs[aci] = (ac_params->aci_aifsn) & 0x0f;
/* WMM spec P.11: The minimum value for AIFSN shall be 2 */
qos_param->aifs[aci] = max_t(u8, qos_param->aifs[aci], 2);
qos_param->cw_min[aci] = cpu_to_le16(ac_params->ecw_min_max &
0x0F);
qos_param->cw_max[aci] = cpu_to_le16((ac_params->ecw_min_max &
0xF0) >> 4);
qos_param->flag[aci] =
(ac_params->aci_aifsn & 0x10) ? 0x01 : 0x00;
qos_param->tx_op_limit[aci] = ac_params->tx_op_limit;
}
return 0;
}
/* we have a generic data element which it may contain QoS information or
* parameters element. check the information element length to decide
* which type to read
*/
static int rtllib_parse_qos_info_param_IE(struct rtllib_device *ieee,
struct rtllib_info_element
*info_element,
struct rtllib_network *network)
{
int rc = 0;
struct rtllib_qos_information_element qos_info_element;
rc = rtllib_read_qos_info_element(&qos_info_element, info_element);
if (rc == 0) {
network->qos_data.param_count = qos_info_element.ac_info & 0x0F;
network->flags |= NETWORK_HAS_QOS_INFORMATION;
} else {
struct rtllib_qos_parameter_info param_element;
rc = rtllib_read_qos_param_element(¶m_element,
info_element);
if (rc == 0) {
rtllib_qos_convert_ac_to_parameters(¶m_element,
&(network->qos_data));
network->flags |= NETWORK_HAS_QOS_PARAMETERS;
network->qos_data.param_count =
param_element.info_element.ac_info & 0x0F;
}
}
if (rc == 0) {
netdev_dbg(ieee->dev, "QoS is supported\n");
network->qos_data.supported = 1;
}
return rc;
}
static const char *get_info_element_string(u16 id)
{
switch (id) {
case MFIE_TYPE_SSID:
return "SSID";
case MFIE_TYPE_RATES:
return "RATES";
case MFIE_TYPE_FH_SET:
return "FH_SET";
case MFIE_TYPE_DS_SET:
return "DS_SET";
case MFIE_TYPE_CF_SET:
return "CF_SET";
case MFIE_TYPE_TIM:
return "TIM";
case MFIE_TYPE_IBSS_SET:
return "IBSS_SET";
case MFIE_TYPE_COUNTRY:
return "COUNTRY";
case MFIE_TYPE_HOP_PARAMS:
return "HOP_PARAMS";
case MFIE_TYPE_HOP_TABLE:
return "HOP_TABLE";
case MFIE_TYPE_REQUEST:
return "REQUEST";
case MFIE_TYPE_CHALLENGE:
return "CHALLENGE";
case MFIE_TYPE_POWER_CONSTRAINT:
return "POWER_CONSTRAINT";
case MFIE_TYPE_POWER_CAPABILITY:
return "POWER_CAPABILITY";
case MFIE_TYPE_TPC_REQUEST:
return "TPC_REQUEST";
case MFIE_TYPE_TPC_REPORT:
return "TPC_REPORT";
case MFIE_TYPE_SUPP_CHANNELS:
return "SUPP_CHANNELS";
case MFIE_TYPE_CSA:
return "CSA";
case MFIE_TYPE_MEASURE_REQUEST:
return "MEASURE_REQUEST";
case MFIE_TYPE_MEASURE_REPORT:
return "MEASURE_REPORT";
case MFIE_TYPE_QUIET:
return "QUIET";
case MFIE_TYPE_IBSS_DFS:
return "IBSS_DFS";
case MFIE_TYPE_RSN:
return "RSN";
case MFIE_TYPE_RATES_EX:
return "RATES_EX";
case MFIE_TYPE_GENERIC:
return "GENERIC";
case MFIE_TYPE_QOS_PARAMETER:
return "QOS_PARAMETER";
default:
return "UNKNOWN";
}
}
static void rtllib_parse_mife_generic(struct rtllib_device *ieee,
struct rtllib_info_element *info_element,
struct rtllib_network *network,
u16 *tmp_htcap_len,
u16 *tmp_htinfo_len)
{
u16 ht_realtek_agg_len = 0;
u8 ht_realtek_agg_buf[MAX_IE_LEN];
if (!rtllib_parse_qos_info_param_IE(ieee, info_element, network))
return;
if (info_element->len >= 4 &&
info_element->data[0] == 0x00 &&
info_element->data[1] == 0x50 &&
info_element->data[2] == 0xf2 &&
info_element->data[3] == 0x01) {
network->wpa_ie_len = min(info_element->len + 2,
MAX_WPA_IE_LEN);
memcpy(network->wpa_ie, info_element, network->wpa_ie_len);
return;
}
if (info_element->len == 7 &&
info_element->data[0] == 0x00 &&
info_element->data[1] == 0xe0 &&
info_element->data[2] == 0x4c &&
info_element->data[3] == 0x01 &&
info_element->data[4] == 0x02)
network->turbo_enable = 1;
if (*tmp_htcap_len == 0) {
if (info_element->len >= 4 &&
info_element->data[0] == 0x00 &&
info_element->data[1] == 0x90 &&
info_element->data[2] == 0x4c &&
info_element->data[3] == 0x033) {
*tmp_htcap_len = min_t(u8, info_element->len,
MAX_IE_LEN);
if (*tmp_htcap_len != 0) {
network->bssht.bd_ht_spec_ver = HT_SPEC_VER_EWC;
network->bssht.bd_ht_cap_len = min_t(u16, *tmp_htcap_len,
sizeof(network->bssht.bd_ht_cap_buf));
memcpy(network->bssht.bd_ht_cap_buf,
info_element->data,
network->bssht.bd_ht_cap_len);
}
}
if (*tmp_htcap_len != 0) {
network->bssht.bd_support_ht = true;
network->bssht.bd_ht_1r = ((((struct ht_capab_ele *)(network->bssht.bd_ht_cap_buf))->MCS[1]) == 0);
} else {
network->bssht.bd_support_ht = false;
network->bssht.bd_ht_1r = false;
}
}
if (*tmp_htinfo_len == 0) {
if (info_element->len >= 4 &&
info_element->data[0] == 0x00 &&
info_element->data[1] == 0x90 &&
info_element->data[2] == 0x4c &&
info_element->data[3] == 0x034) {
*tmp_htinfo_len = min_t(u8, info_element->len,
MAX_IE_LEN);
if (*tmp_htinfo_len != 0) {
network->bssht.bd_ht_spec_ver = HT_SPEC_VER_EWC;
network->bssht.bd_ht_info_len = min_t(u16, *tmp_htinfo_len,
sizeof(network->bssht.bd_ht_info_buf));
memcpy(network->bssht.bd_ht_info_buf,
info_element->data,
network->bssht.bd_ht_info_len);
}
}
}
if (network->bssht.bd_support_ht) {
if (info_element->len >= 4 &&
info_element->data[0] == 0x00 &&
info_element->data[1] == 0xe0 &&
info_element->data[2] == 0x4c &&
info_element->data[3] == 0x02) {
ht_realtek_agg_len = min_t(u8, info_element->len,
MAX_IE_LEN);
memcpy(ht_realtek_agg_buf, info_element->data,
info_element->len);
}
if (ht_realtek_agg_len >= 5) {
network->realtek_cap_exit = true;
network->bssht.bd_rt2rt_aggregation = true;
if ((ht_realtek_agg_buf[4] == 1) &&
(ht_realtek_agg_buf[5] & 0x02))
network->bssht.bd_rt2rt_long_slot_time = true;
if ((ht_realtek_agg_buf[4] == 1) &&
(ht_realtek_agg_buf[5] & RT_HT_CAP_USE_92SE))
network->bssht.rt2rt_ht_mode |= RT_HT_CAP_USE_92SE;
}
}
if (ht_realtek_agg_len >= 5) {
if ((ht_realtek_agg_buf[5] & RT_HT_CAP_USE_SOFTAP))
network->bssht.rt2rt_ht_mode |= RT_HT_CAP_USE_SOFTAP;
}
if ((info_element->len >= 3 &&
info_element->data[0] == 0x00 &&
info_element->data[1] == 0x05 &&
info_element->data[2] == 0xb5) ||
(info_element->len >= 3 &&
info_element->data[0] == 0x00 &&
info_element->data[1] == 0x0a &&
info_element->data[2] == 0xf7) ||
(info_element->len >= 3 &&
info_element->data[0] == 0x00 &&
info_element->data[1] == 0x10 &&
info_element->data[2] == 0x18)) {
network->broadcom_cap_exist = true;
}
if (info_element->len >= 3 &&
info_element->data[0] == 0x00 &&
info_element->data[1] == 0x0c &&
info_element->data[2] == 0x43)
network->ralink_cap_exist = true;
if ((info_element->len >= 3 &&
info_element->data[0] == 0x00 &&
info_element->data[1] == 0x03 &&
info_element->data[2] == 0x7f) ||
(info_element->len >= 3 &&
info_element->data[0] == 0x00 &&
info_element->data[1] == 0x13 &&
info_element->data[2] == 0x74))
network->atheros_cap_exist = true;
if ((info_element->len >= 3 &&
info_element->data[0] == 0x00 &&
info_element->data[1] == 0x50 &&
info_element->data[2] == 0x43))
network->marvell_cap_exist = true;
if (info_element->len >= 3 &&
info_element->data[0] == 0x00 &&
info_element->data[1] == 0x40 &&
info_element->data[2] == 0x96)
network->cisco_cap_exist = true;
if (info_element->len >= 3 &&
info_element->data[0] == 0x00 &&
info_element->data[1] == 0x0a &&
info_element->data[2] == 0xf5)
network->airgo_cap_exist = true;
if (info_element->len > 4 &&
info_element->data[0] == 0x00 &&
info_element->data[1] == 0x40 &&
info_element->data[2] == 0x96 &&
info_element->data[3] == 0x01) {
if (info_element->len == 6) {
memcpy(network->ccx_rm_state, &info_element->data[4], 2);
if (network->ccx_rm_state[0] != 0)
network->ccx_rm_enable = true;
else
network->ccx_rm_enable = false;
network->mb_ssid_mask = network->ccx_rm_state[1] & 0x07;
if (network->mb_ssid_mask != 0) {
network->mb_ssid_valid = true;
network->mb_ssid_mask = 0xff <<
(network->mb_ssid_mask);
ether_addr_copy(network->mb_ssid,
network->bssid);
network->mb_ssid[5] &= network->mb_ssid_mask;
} else {
network->mb_ssid_valid = false;
}
} else {
network->ccx_rm_enable = false;
}
}
if (info_element->len > 4 &&
info_element->data[0] == 0x00 &&
info_element->data[1] == 0x40 &&
info_element->data[2] == 0x96 &&
info_element->data[3] == 0x03) {
if (info_element->len == 5) {
network->with_ccx_ver_num = true;
network->bss_ccx_ver_number = info_element->data[4];
} else {
network->with_ccx_ver_num = false;
network->bss_ccx_ver_number = 0;
}
}
if (info_element->len > 4 &&
info_element->data[0] == 0x00 &&
info_element->data[1] == 0x50 &&
info_element->data[2] == 0xf2 &&
info_element->data[3] == 0x04) {
netdev_dbg(ieee->dev, "MFIE_TYPE_WZC: %d bytes\n",
info_element->len);
network->wzc_ie_len = min(info_element->len + 2, MAX_WZC_IE_LEN);
memcpy(network->wzc_ie, info_element, network->wzc_ie_len);
}
}
static void rtllib_parse_mfie_ht_cap(struct rtllib_info_element *info_element,
struct rtllib_network *network,
u16 *tmp_htcap_len)
{
struct bss_ht *ht = &network->bssht;
*tmp_htcap_len = min_t(u8, info_element->len, MAX_IE_LEN);
if (*tmp_htcap_len != 0) {
ht->bd_ht_spec_ver = HT_SPEC_VER_EWC;
ht->bd_ht_cap_len = min_t(u16, *tmp_htcap_len,
sizeof(ht->bd_ht_cap_buf));
memcpy(ht->bd_ht_cap_buf, info_element->data, ht->bd_ht_cap_len);
ht->bd_support_ht = true;
ht->bd_ht_1r = ((((struct ht_capab_ele *)
ht->bd_ht_cap_buf))->MCS[1]) == 0;
ht->bd_bandwidth = (enum ht_channel_width)
(((struct ht_capab_ele *)
(ht->bd_ht_cap_buf))->chl_width);
} else {
ht->bd_support_ht = false;
ht->bd_ht_1r = false;
ht->bd_bandwidth = HT_CHANNEL_WIDTH_20;
}
}
int rtllib_parse_info_param(struct rtllib_device *ieee,
struct rtllib_info_element *info_element,
u16 length,
struct rtllib_network *network,
struct rtllib_rx_stats *stats)
{
u8 i;
short offset;
u16 tmp_htcap_len = 0;
u16 tmp_htinfo_len = 0;
char rates_str[64];
char *p;
while (length >= sizeof(*info_element)) {
if (sizeof(*info_element) + info_element->len > length) {
netdev_dbg(ieee->dev,
"Info elem: parse failed: info_element->len + 2 > left : info_element->len+2=%zd left=%d, id=%d.\n",
info_element->len + sizeof(*info_element),
length, info_element->id);
/* We stop processing but don't return an error here
* because some misbehaviour APs break this rule. ie.
* Orinoco AP1000.
*/
break;
}
switch (info_element->id) {
case MFIE_TYPE_SSID:
if (rtllib_is_empty_essid(info_element->data,
info_element->len)) {
network->flags |= NETWORK_EMPTY_ESSID;
break;
}
network->ssid_len = min(info_element->len,
(u8)IW_ESSID_MAX_SIZE);
memcpy(network->ssid, info_element->data,
network->ssid_len);
if (network->ssid_len < IW_ESSID_MAX_SIZE)
memset(network->ssid + network->ssid_len, 0,
IW_ESSID_MAX_SIZE - network->ssid_len);
netdev_dbg(ieee->dev, "MFIE_TYPE_SSID: '%s' len=%d.\n",
network->ssid, network->ssid_len);
break;
case MFIE_TYPE_RATES:
p = rates_str;
network->rates_len = min(info_element->len,
MAX_RATES_LENGTH);
for (i = 0; i < network->rates_len; i++) {
network->rates[i] = info_element->data[i];
p += scnprintf(p, sizeof(rates_str) -
(p - rates_str), "%02X ",
network->rates[i]);
if (rtllib_is_ofdm_rate
(info_element->data[i])) {
network->flags |= NETWORK_HAS_OFDM;
if (info_element->data[i] &
RTLLIB_BASIC_RATE_MASK)
network->flags &=
~NETWORK_HAS_CCK;
}
if (rtllib_is_cck_rate
(info_element->data[i])) {
network->flags |= NETWORK_HAS_CCK;
}
}
netdev_dbg(ieee->dev, "MFIE_TYPE_RATES: '%s' (%d)\n",
rates_str, network->rates_len);
break;
case MFIE_TYPE_RATES_EX:
p = rates_str;
network->rates_ex_len = min(info_element->len,
MAX_RATES_EX_LENGTH);
for (i = 0; i < network->rates_ex_len; i++) {
network->rates_ex[i] = info_element->data[i];
p += scnprintf(p, sizeof(rates_str) -
(p - rates_str), "%02X ",
network->rates_ex[i]);
if (rtllib_is_ofdm_rate
(info_element->data[i])) {
network->flags |= NETWORK_HAS_OFDM;
if (info_element->data[i] &
RTLLIB_BASIC_RATE_MASK)
network->flags &=
~NETWORK_HAS_CCK;
}
}
netdev_dbg(ieee->dev, "MFIE_TYPE_RATES_EX: '%s' (%d)\n",
rates_str, network->rates_ex_len);
break;
case MFIE_TYPE_DS_SET:
netdev_dbg(ieee->dev, "MFIE_TYPE_DS_SET: %d\n",
info_element->data[0]);
network->channel = info_element->data[0];
break;
case MFIE_TYPE_FH_SET:
netdev_dbg(ieee->dev, "MFIE_TYPE_FH_SET: ignored\n");
break;
case MFIE_TYPE_CF_SET:
netdev_dbg(ieee->dev, "MFIE_TYPE_CF_SET: ignored\n");
break;
case MFIE_TYPE_TIM:
if (info_element->len < 4)
break;
network->tim.tim_count = info_element->data[0];
network->tim.tim_period = info_element->data[1];
network->dtim_period = info_element->data[1];
if (ieee->link_state != MAC80211_LINKED)
break;
network->last_dtim_sta_time = jiffies;
network->dtim_data = RTLLIB_DTIM_VALID;
if (info_element->data[2] & 1)
network->dtim_data |= RTLLIB_DTIM_MBCAST;
offset = (info_element->data[2] >> 1) * 2;
if (ieee->assoc_id < 8 * offset ||
ieee->assoc_id > 8 * (offset + info_element->len - 3))
break;
offset = (ieee->assoc_id / 8) - offset;
if (info_element->data[3 + offset] &
(1 << (ieee->assoc_id % 8)))
network->dtim_data |= RTLLIB_DTIM_UCAST;
network->listen_interval = network->dtim_period;
break;
case MFIE_TYPE_ERP:
network->erp_value = info_element->data[0];
network->flags |= NETWORK_HAS_ERP_VALUE;
netdev_dbg(ieee->dev, "MFIE_TYPE_ERP_SET: %d\n",
network->erp_value);
break;
case MFIE_TYPE_IBSS_SET:
network->atim_window = info_element->data[0];
netdev_dbg(ieee->dev, "MFIE_TYPE_IBSS_SET: %d\n",
network->atim_window);
break;
case MFIE_TYPE_CHALLENGE:
netdev_dbg(ieee->dev, "MFIE_TYPE_CHALLENGE: ignored\n");
break;
case MFIE_TYPE_GENERIC:
netdev_dbg(ieee->dev, "MFIE_TYPE_GENERIC: %d bytes\n",
info_element->len);
rtllib_parse_mife_generic(ieee, info_element, network,
&tmp_htcap_len,
&tmp_htinfo_len);
break;
case MFIE_TYPE_RSN:
netdev_dbg(ieee->dev, "MFIE_TYPE_RSN: %d bytes\n",
info_element->len);
network->rsn_ie_len = min(info_element->len + 2,
MAX_WPA_IE_LEN);
memcpy(network->rsn_ie, info_element,
network->rsn_ie_len);
break;
case MFIE_TYPE_HT_CAP:
netdev_dbg(ieee->dev, "MFIE_TYPE_HT_CAP: %d bytes\n",
info_element->len);
rtllib_parse_mfie_ht_cap(info_element, network,
&tmp_htcap_len);
break;
case MFIE_TYPE_HT_INFO:
netdev_dbg(ieee->dev, "MFIE_TYPE_HT_INFO: %d bytes\n",
info_element->len);
tmp_htinfo_len = min_t(u8, info_element->len,
MAX_IE_LEN);
if (tmp_htinfo_len) {
network->bssht.bd_ht_spec_ver = HT_SPEC_VER_IEEE;
network->bssht.bd_ht_info_len = tmp_htinfo_len >
sizeof(network->bssht.bd_ht_info_buf) ?
sizeof(network->bssht.bd_ht_info_buf) :
tmp_htinfo_len;
memcpy(network->bssht.bd_ht_info_buf,
info_element->data,
network->bssht.bd_ht_info_len);
}
break;
case MFIE_TYPE_AIRONET:
netdev_dbg(ieee->dev, "MFIE_TYPE_AIRONET: %d bytes\n",
info_element->len);
if (info_element->len > IE_CISCO_FLAG_POSITION) {
network->with_aironet_ie = true;
if ((info_element->data[IE_CISCO_FLAG_POSITION]
& SUPPORT_CKIP_MIC) ||
(info_element->data[IE_CISCO_FLAG_POSITION]
& SUPPORT_CKIP_PK))
network->ckip_supported = true;
else
network->ckip_supported = false;
} else {
network->with_aironet_ie = false;
network->ckip_supported = false;
}
break;
case MFIE_TYPE_QOS_PARAMETER:
netdev_err(ieee->dev,
"QoS Error need to parse QOS_PARAMETER IE\n");
break;
case MFIE_TYPE_COUNTRY:
netdev_dbg(ieee->dev, "MFIE_TYPE_COUNTRY: %d bytes\n",
info_element->len);
break;
/* TODO */
default:
netdev_dbg(ieee->dev,
"Unsupported info element: %s (%d)\n",
get_info_element_string(info_element->id),
info_element->id);
break;
}
length -= sizeof(*info_element) + info_element->len;
info_element =
(struct rtllib_info_element *)&info_element->data[info_element->len];
}
if (!network->atheros_cap_exist && !network->broadcom_cap_exist &&
!network->cisco_cap_exist && !network->ralink_cap_exist &&
!network->bssht.bd_rt2rt_aggregation)
network->unknown_cap_exist = true;
else
network->unknown_cap_exist = false;
return 0;
}
static long rtllib_translate_todbm(u8 signal_strength_index)
{
long signal_power;
signal_power = (long)((signal_strength_index + 1) >> 1);
signal_power -= 95;
return signal_power;
}
static inline int rtllib_network_init(
struct rtllib_device *ieee,
struct rtllib_probe_response *beacon,
struct rtllib_network *network,
struct rtllib_rx_stats *stats)
{
memset(&network->qos_data, 0, sizeof(struct rtllib_qos_data));
/* Pull out fixed field data */
ether_addr_copy(network->bssid, beacon->header.addr3);
network->capability = le16_to_cpu(beacon->capability);
network->last_scanned = jiffies;
network->time_stamp[0] = beacon->time_stamp[0];
network->time_stamp[1] = beacon->time_stamp[1];
network->beacon_interval = le16_to_cpu(beacon->beacon_interval);
/* Where to pull this? beacon->listen_interval;*/
network->listen_interval = 0x0A;
network->rates_len = network->rates_ex_len = 0;
network->ssid_len = 0;
network->hidden_ssid_len = 0;
memset(network->hidden_ssid, 0, sizeof(network->hidden_ssid));
network->flags = 0;
network->atim_window = 0;
network->erp_value = (network->capability & WLAN_CAPABILITY_IBSS) ?
0x3 : 0x0;
network->berp_info_valid = false;
network->broadcom_cap_exist = false;
network->ralink_cap_exist = false;
network->atheros_cap_exist = false;
network->cisco_cap_exist = false;
network->unknown_cap_exist = false;
network->realtek_cap_exit = false;
network->marvell_cap_exist = false;
network->airgo_cap_exist = false;
network->turbo_enable = 0;
network->signal_strength = stats->signal_strength;
network->RSSI = stats->signal_strength;
network->country_ie_len = 0;
memset(network->country_ie_buf, 0, MAX_IE_LEN);
ht_initialize_bss_desc(&network->bssht);
network->flags |= NETWORK_HAS_CCK;
network->wpa_ie_len = 0;
network->rsn_ie_len = 0;
network->wzc_ie_len = 0;
if (rtllib_parse_info_param(ieee,
beacon->info_element,
(stats->len - sizeof(*beacon)),
network,
stats))
return 1;
network->mode = 0;
if (network->flags & NETWORK_HAS_OFDM)
network->mode |= WIRELESS_MODE_G;
if (network->flags & NETWORK_HAS_CCK)
network->mode |= WIRELESS_MODE_B;
if (network->mode == 0) {
netdev_dbg(ieee->dev, "Filtered out '%s (%pM)' network.\n",
escape_essid(network->ssid, network->ssid_len),
network->bssid);
return 1;
}
if (network->bssht.bd_support_ht) {
if (network->mode & (WIRELESS_MODE_G | WIRELESS_MODE_B))
network->mode = WIRELESS_MODE_N_24G;
}
if (rtllib_is_empty_essid(network->ssid, network->ssid_len))
network->flags |= NETWORK_EMPTY_ESSID;
stats->signal = 30 + (stats->signal_strength * 70) / 100;
stats->noise = rtllib_translate_todbm((u8)(100 - stats->signal)) - 25;
memcpy(&network->stats, stats, sizeof(network->stats));
return 0;
}
static inline int is_same_network(struct rtllib_network *src,
struct rtllib_network *dst, u8 ssidbroad)
{
/* A network is only a duplicate if the channel, BSSID, ESSID
* and the capability field (in particular IBSS and BSS) all match.
* We treat all <hidden> with the same BSSID and channel
* as one network
*/
return (((src->ssid_len == dst->ssid_len) || (!ssidbroad)) &&
(src->channel == dst->channel) &&
!memcmp(src->bssid, dst->bssid, ETH_ALEN) &&
(!memcmp(src->ssid, dst->ssid, src->ssid_len) ||
(!ssidbroad)) &&
((src->capability & WLAN_CAPABILITY_IBSS) ==
(dst->capability & WLAN_CAPABILITY_IBSS)) &&
((src->capability & WLAN_CAPABILITY_ESS) ==
(dst->capability & WLAN_CAPABILITY_ESS)));
}
static inline void update_network(struct rtllib_device *ieee,
struct rtllib_network *dst,
struct rtllib_network *src)
{
int qos_active;
u8 old_param;
memcpy(&dst->stats, &src->stats, sizeof(struct rtllib_rx_stats));
dst->capability = src->capability;
memcpy(dst->rates, src->rates, src->rates_len);
dst->rates_len = src->rates_len;
memcpy(dst->rates_ex, src->rates_ex, src->rates_ex_len);
dst->rates_ex_len = src->rates_ex_len;
if (src->ssid_len > 0) {
if (dst->ssid_len == 0) {
memset(dst->hidden_ssid, 0, sizeof(dst->hidden_ssid));
dst->hidden_ssid_len = src->ssid_len;
memcpy(dst->hidden_ssid, src->ssid, src->ssid_len);
} else {
memset(dst->ssid, 0, dst->ssid_len);
dst->ssid_len = src->ssid_len;
memcpy(dst->ssid, src->ssid, src->ssid_len);
}
}
dst->mode = src->mode;
dst->flags = src->flags;
dst->time_stamp[0] = src->time_stamp[0];
dst->time_stamp[1] = src->time_stamp[1];
if (src->flags & NETWORK_HAS_ERP_VALUE) {
dst->erp_value = src->erp_value;
dst->berp_info_valid = src->berp_info_valid = true;
}
dst->beacon_interval = src->beacon_interval;
dst->listen_interval = src->listen_interval;
dst->atim_window = src->atim_window;
dst->dtim_period = src->dtim_period;
dst->dtim_data = src->dtim_data;
dst->last_dtim_sta_time = src->last_dtim_sta_time;
memcpy(&dst->tim, &src->tim, sizeof(struct rtllib_tim_parameters));
dst->bssht.bd_support_ht = src->bssht.bd_support_ht;
dst->bssht.bd_rt2rt_aggregation = src->bssht.bd_rt2rt_aggregation;
dst->bssht.bd_ht_cap_len = src->bssht.bd_ht_cap_len;
memcpy(dst->bssht.bd_ht_cap_buf, src->bssht.bd_ht_cap_buf,
src->bssht.bd_ht_cap_len);
dst->bssht.bd_ht_info_len = src->bssht.bd_ht_info_len;
memcpy(dst->bssht.bd_ht_info_buf, src->bssht.bd_ht_info_buf,
src->bssht.bd_ht_info_len);
dst->bssht.bd_ht_spec_ver = src->bssht.bd_ht_spec_ver;
dst->bssht.bd_rt2rt_long_slot_time = src->bssht.bd_rt2rt_long_slot_time;
dst->broadcom_cap_exist = src->broadcom_cap_exist;
dst->ralink_cap_exist = src->ralink_cap_exist;
dst->atheros_cap_exist = src->atheros_cap_exist;
dst->realtek_cap_exit = src->realtek_cap_exit;
dst->marvell_cap_exist = src->marvell_cap_exist;
dst->cisco_cap_exist = src->cisco_cap_exist;
dst->airgo_cap_exist = src->airgo_cap_exist;
dst->unknown_cap_exist = src->unknown_cap_exist;
memcpy(dst->wpa_ie, src->wpa_ie, src->wpa_ie_len);
dst->wpa_ie_len = src->wpa_ie_len;
memcpy(dst->rsn_ie, src->rsn_ie, src->rsn_ie_len);
dst->rsn_ie_len = src->rsn_ie_len;
memcpy(dst->wzc_ie, src->wzc_ie, src->wzc_ie_len);
dst->wzc_ie_len = src->wzc_ie_len;
dst->last_scanned = jiffies;
/* qos related parameters */
qos_active = dst->qos_data.active;
old_param = dst->qos_data.param_count;
dst->qos_data.supported = src->qos_data.supported;
if (dst->flags & NETWORK_HAS_QOS_PARAMETERS)
memcpy(&dst->qos_data, &src->qos_data,
sizeof(struct rtllib_qos_data));
if (dst->qos_data.supported == 1) {
if (dst->ssid_len)
netdev_dbg(ieee->dev,
"QoS the network %s is QoS supported\n",
dst->ssid);
else
netdev_dbg(ieee->dev,
"QoS the network is QoS supported\n");
}
dst->qos_data.active = qos_active;
dst->qos_data.old_param_count = old_param;
dst->wmm_info = src->wmm_info;
if (src->wmm_param[0].ac_aci_acm_aifsn ||
src->wmm_param[1].ac_aci_acm_aifsn ||
src->wmm_param[2].ac_aci_acm_aifsn ||
src->wmm_param[3].ac_aci_acm_aifsn)
memcpy(dst->wmm_param, src->wmm_param, WME_AC_PRAM_LEN);
dst->signal_strength = src->signal_strength;
dst->RSSI = src->RSSI;
dst->turbo_enable = src->turbo_enable;
dst->country_ie_len = src->country_ie_len;
memcpy(dst->country_ie_buf, src->country_ie_buf, src->country_ie_len);
dst->with_aironet_ie = src->with_aironet_ie;
dst->ckip_supported = src->ckip_supported;
memcpy(dst->ccx_rm_state, src->ccx_rm_state, 2);
dst->ccx_rm_enable = src->ccx_rm_enable;
dst->mb_ssid_mask = src->mb_ssid_mask;
dst->mb_ssid_valid = src->mb_ssid_valid;
memcpy(dst->mb_ssid, src->mb_ssid, 6);
dst->with_ccx_ver_num = src->with_ccx_ver_num;
dst->bss_ccx_ver_number = src->bss_ccx_ver_number;
}
static int is_passive_channel(struct rtllib_device *rtllib, u8 channel)
{
if (channel > MAX_CHANNEL_NUMBER) {
netdev_info(rtllib->dev, "%s(): Invalid Channel\n", __func__);
return 0;
}
if (rtllib->active_channel_map[channel] == 2)
return 1;
return 0;
}
int rtllib_legal_channel(struct rtllib_device *rtllib, u8 channel)
{
if (channel > MAX_CHANNEL_NUMBER) {
netdev_info(rtllib->dev, "%s(): Invalid Channel\n", __func__);
return 0;
}
if (rtllib->active_channel_map[channel] > 0)
return 1;
return 0;
}
EXPORT_SYMBOL(rtllib_legal_channel);
static inline void rtllib_process_probe_response(
struct rtllib_device *ieee,
struct rtllib_probe_response *beacon,
struct rtllib_rx_stats *stats)
{
struct rtllib_network *target;
struct rtllib_network *oldest = NULL;
struct rtllib_info_element *info_element = &beacon->info_element[0];
unsigned long flags;
short renew;
struct rtllib_network *network = kzalloc(sizeof(struct rtllib_network),
GFP_ATOMIC);
__le16 frame_ctl = beacon->header.frame_control;
if (!network)
return;
netdev_dbg(ieee->dev,
"'%s' ( %pM ): %c%c%c%c %c%c%c%c-%c%c%c%c %c%c%c%c\n",
escape_essid(info_element->data, info_element->len),
beacon->header.addr3,
(le16_to_cpu(beacon->capability) & (1 << 0xf)) ? '1' : '0',
(le16_to_cpu(beacon->capability) & (1 << 0xe)) ? '1' : '0',
(le16_to_cpu(beacon->capability) & (1 << 0xd)) ? '1' : '0',
(le16_to_cpu(beacon->capability) & (1 << 0xc)) ? '1' : '0',
(le16_to_cpu(beacon->capability) & (1 << 0xb)) ? '1' : '0',
(le16_to_cpu(beacon->capability) & (1 << 0xa)) ? '1' : '0',
(le16_to_cpu(beacon->capability) & (1 << 0x9)) ? '1' : '0',
(le16_to_cpu(beacon->capability) & (1 << 0x8)) ? '1' : '0',
(le16_to_cpu(beacon->capability) & (1 << 0x7)) ? '1' : '0',
(le16_to_cpu(beacon->capability) & (1 << 0x6)) ? '1' : '0',
(le16_to_cpu(beacon->capability) & (1 << 0x5)) ? '1' : '0',
(le16_to_cpu(beacon->capability) & (1 << 0x4)) ? '1' : '0',
(le16_to_cpu(beacon->capability) & (1 << 0x3)) ? '1' : '0',
(le16_to_cpu(beacon->capability) & (1 << 0x2)) ? '1' : '0',
(le16_to_cpu(beacon->capability) & (1 << 0x1)) ? '1' : '0',
(le16_to_cpu(beacon->capability) & (1 << 0x0)) ? '1' : '0');
if (rtllib_network_init(ieee, beacon, network, stats)) {
netdev_dbg(ieee->dev, "Dropped '%s' ( %pM) via %s.\n",
escape_essid(info_element->data, info_element->len),
beacon->header.addr3,
ieee80211_is_beacon(frame_ctl) ? "BEACON" : "PROBE RESPONSE");
goto free_network;
}
if (!rtllib_legal_channel(ieee, network->channel))
goto free_network;
if (ieee80211_is_probe_resp(frame_ctl)) {
if (is_passive_channel(ieee, network->channel)) {
netdev_info(ieee->dev,
"GetScanInfo(): For Global Domain, filter probe response at channel(%d).\n",
network->channel);
goto free_network;
}
}
/* The network parsed correctly -- so now we scan our known networks
* to see if we can find it in our list.
*
* NOTE: This search is definitely not optimized. Once its doing
* the "right thing" we'll optimize it for efficiency if
* necessary
*/
/* Search for this entry in the list and update it if it is
* already there.
*/
spin_lock_irqsave(&ieee->lock, flags);
if (is_same_network(&ieee->current_network, network,
(network->ssid_len ? 1 : 0))) {
update_network(ieee, &ieee->current_network, network);
if ((ieee->current_network.mode == WIRELESS_MODE_N_24G ||
ieee->current_network.mode == WIRELESS_MODE_G) &&
ieee->current_network.berp_info_valid) {
if (ieee->current_network.erp_value & ERP_UseProtection)
ieee->current_network.buseprotection = true;
else
ieee->current_network.buseprotection = false;
}
if (ieee80211_is_beacon(frame_ctl)) {
if (ieee->link_state >= MAC80211_LINKED)
ieee->link_detect_info.num_recv_bcn_in_period++;
}
}
list_for_each_entry(target, &ieee->network_list, list) {
if (is_same_network(target, network,
(target->ssid_len ? 1 : 0)))
break;
if (!oldest || (target->last_scanned < oldest->last_scanned))
oldest = target;
}
/* If we didn't find a match, then get a new network slot to initialize
* with this beacon's information
*/
if (&target->list == &ieee->network_list) {
if (list_empty(&ieee->network_free_list)) {
/* If there are no more slots, expire the oldest */
list_del(&oldest->list);
target = oldest;
netdev_dbg(ieee->dev,
"Expired '%s' ( %pM) from network list.\n",
escape_essid(target->ssid, target->ssid_len),
target->bssid);
} else {
/* Otherwise just pull from the free list */
target = list_entry(ieee->network_free_list.next,
struct rtllib_network, list);
list_del(ieee->network_free_list.next);
}
netdev_dbg(ieee->dev, "Adding '%s' ( %pM) via %s.\n",
escape_essid(network->ssid, network->ssid_len),
network->bssid,
ieee80211_is_beacon(frame_ctl) ? "BEACON" : "PROBE RESPONSE");
memcpy(target, network, sizeof(*target));
list_add_tail(&target->list, &ieee->network_list);
if (ieee->softmac_features & IEEE_SOFTMAC_ASSOCIATE)
rtllib_softmac_new_net(ieee, network);
} else {
netdev_dbg(ieee->dev, "Updating '%s' ( %pM) via %s.\n",
escape_essid(target->ssid, target->ssid_len),
target->bssid,
ieee80211_is_beacon(frame_ctl) ? "BEACON" : "PROBE RESPONSE");
/* we have an entry and we are going to update it. But this
* entry may be already expired. In this case we do the same
* as we found a new net and call the new_net handler
*/
renew = !time_after(target->last_scanned + ieee->scan_age,
jiffies);
if ((!target->ssid_len) &&
(((network->ssid_len > 0) && (target->hidden_ssid_len == 0))
|| ((ieee->current_network.ssid_len == network->ssid_len) &&
(strncmp(ieee->current_network.ssid, network->ssid,
network->ssid_len) == 0) &&
(ieee->link_state == MAC80211_NOLINK))))
renew = 1;
update_network(ieee, target, network);
if (renew && (ieee->softmac_features & IEEE_SOFTMAC_ASSOCIATE))
rtllib_softmac_new_net(ieee, network);
}
spin_unlock_irqrestore(&ieee->lock, flags);
if (ieee80211_is_beacon(frame_ctl) &&
is_same_network(&ieee->current_network, network,
(network->ssid_len ? 1 : 0)) &&
(ieee->link_state == MAC80211_LINKED)) {
ieee->handle_beacon(ieee->dev, beacon, &ieee->current_network);
}
free_network:
kfree(network);
}
static void rtllib_rx_mgt(struct rtllib_device *ieee,
struct sk_buff *skb,
struct rtllib_rx_stats *stats)
{
struct ieee80211_hdr *header = (struct ieee80211_hdr *)skb->data;
if (!ieee80211_is_probe_resp(header->frame_control) &&
(!ieee80211_is_beacon(header->frame_control)))
ieee->last_rx_ps_time = jiffies;
if (ieee80211_is_beacon(header->frame_control)) {
netdev_dbg(ieee->dev, "received BEACON\n");
rtllib_process_probe_response(
ieee, (struct rtllib_probe_response *)header,
stats);
if (ieee->sta_sleep || (ieee->ps != RTLLIB_PS_DISABLED &&
ieee->iw_mode == IW_MODE_INFRA &&
ieee->link_state == MAC80211_LINKED))
schedule_work(&ieee->ps_task);
} else if (ieee80211_is_probe_resp(header->frame_control)) {
netdev_dbg(ieee->dev, "received PROBE RESPONSE\n");
rtllib_process_probe_response(ieee, (struct rtllib_probe_response *)header,
stats);
}
}
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