Commit b2c258fb authored by Johannes Berg's avatar Johannes Berg Committed by David S. Miller
Browse files

[MAC80211]: reorder interface related functions



This patch groups a whole bunch of functions together to make
ieee80211.c more maintainable.
Signed-off-by: default avatarJohannes Berg <johannes@sipsolutions.net>
Signed-off-by: default avatarJiri Benc <jbenc@suse.cz>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent ff688089
......@@ -61,95 +61,190 @@ struct ieee80211_tx_status_rtap_hdr {
u8 data_retries;
} __attribute__ ((packed));
/* common interface routines */
static int rate_list_match(const int *rate_list, int rate)
static struct net_device_stats *ieee80211_get_stats(struct net_device *dev)
{
int i;
struct ieee80211_sub_if_data *sdata;
sdata = IEEE80211_DEV_TO_SUB_IF(dev);
return &(sdata->stats);
}
if (!rate_list)
return 0;
static int header_parse_80211(struct sk_buff *skb, unsigned char *haddr)
{
memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
return ETH_ALEN;
}
for (i = 0; rate_list[i] >= 0; i++)
if (rate_list[i] == rate)
return 1;
/* master interface */
return 0;
}
static int ieee80211_master_open(struct net_device *dev)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct ieee80211_sub_if_data *sdata;
int res = -EOPNOTSUPP;
read_lock(&local->sub_if_lock);
list_for_each_entry(sdata, &local->sub_if_list, list) {
if (sdata->dev != dev && netif_running(sdata->dev)) {
res = 0;
break;
}
}
read_unlock(&local->sub_if_lock);
return res;
}
void ieee80211_prepare_rates(struct ieee80211_local *local,
struct ieee80211_hw_mode *mode)
static int ieee80211_master_stop(struct net_device *dev)
{
int i;
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct ieee80211_sub_if_data *sdata;
for (i = 0; i < mode->num_rates; i++) {
struct ieee80211_rate *rate = &mode->rates[i];
read_lock(&local->sub_if_lock);
list_for_each_entry(sdata, &local->sub_if_list, list)
if (sdata->dev != dev && netif_running(sdata->dev))
dev_close(sdata->dev);
read_unlock(&local->sub_if_lock);
rate->flags &= ~(IEEE80211_RATE_SUPPORTED |
IEEE80211_RATE_BASIC);
return 0;
}
if (local->supp_rates[mode->mode]) {
if (!rate_list_match(local->supp_rates[mode->mode],
rate->rate))
continue;
}
/* management interface */
rate->flags |= IEEE80211_RATE_SUPPORTED;
static void
ieee80211_fill_frame_info(struct ieee80211_local *local,
struct ieee80211_frame_info *fi,
struct ieee80211_rx_status *status)
{
if (status) {
struct timespec ts;
struct ieee80211_rate *rate;
/* Use configured basic rate set if it is available. If not,
* use defaults that are sane for most cases. */
if (local->basic_rates[mode->mode]) {
if (rate_list_match(local->basic_rates[mode->mode],
rate->rate))
rate->flags |= IEEE80211_RATE_BASIC;
} else switch (mode->mode) {
jiffies_to_timespec(jiffies, &ts);
fi->hosttime = cpu_to_be64((u64) ts.tv_sec * 1000000 +
ts.tv_nsec / 1000);
fi->mactime = cpu_to_be64(status->mactime);
switch (status->phymode) {
case MODE_IEEE80211A:
if (rate->rate == 60 || rate->rate == 120 ||
rate->rate == 240)
rate->flags |= IEEE80211_RATE_BASIC;
fi->phytype = htonl(ieee80211_phytype_ofdm_dot11_a);
break;
case MODE_IEEE80211B:
if (rate->rate == 10 || rate->rate == 20)
rate->flags |= IEEE80211_RATE_BASIC;
break;
case MODE_ATHEROS_TURBO:
if (rate->rate == 120 || rate->rate == 240 ||
rate->rate == 480)
rate->flags |= IEEE80211_RATE_BASIC;
fi->phytype = htonl(ieee80211_phytype_dsss_dot11_b);
break;
case MODE_IEEE80211G:
if (rate->rate == 10 || rate->rate == 20 ||
rate->rate == 55 || rate->rate == 110)
rate->flags |= IEEE80211_RATE_BASIC;
break;
}
/* Set ERP and MANDATORY flags based on phymode */
switch (mode->mode) {
case MODE_IEEE80211A:
if (rate->rate == 60 || rate->rate == 120 ||
rate->rate == 240)
rate->flags |= IEEE80211_RATE_MANDATORY;
break;
case MODE_IEEE80211B:
if (rate->rate == 10)
rate->flags |= IEEE80211_RATE_MANDATORY;
fi->phytype = htonl(ieee80211_phytype_pbcc_dot11_g);
break;
case MODE_ATHEROS_TURBO:
fi->phytype =
htonl(ieee80211_phytype_dsss_dot11_turbo);
break;
case MODE_IEEE80211G:
if (rate->rate == 10 || rate->rate == 20 ||
rate->rate == 55 || rate->rate == 110 ||
rate->rate == 60 || rate->rate == 120 ||
rate->rate == 240)
rate->flags |= IEEE80211_RATE_MANDATORY;
default:
fi->phytype = htonl(0xAAAAAAAA);
break;
}
if (ieee80211_is_erp_rate(mode->mode, rate->rate))
rate->flags |= IEEE80211_RATE_ERP;
fi->channel = htonl(status->channel);
rate = ieee80211_get_rate(local, status->phymode,
status->rate);
if (rate) {
fi->datarate = htonl(rate->rate);
if (rate->flags & IEEE80211_RATE_PREAMBLE2) {
if (status->rate == rate->val)
fi->preamble = htonl(2); /* long */
else if (status->rate == rate->val2)
fi->preamble = htonl(1); /* short */
} else
fi->preamble = htonl(0);
} else {
fi->datarate = htonl(0);
fi->preamble = htonl(0);
}
fi->antenna = htonl(status->antenna);
fi->priority = htonl(0xffffffff); /* no clue */
fi->ssi_type = htonl(ieee80211_ssi_raw);
fi->ssi_signal = htonl(status->ssi);
fi->ssi_noise = 0x00000000;
fi->encoding = 0;
} else {
/* clear everything because we really don't know.
* the msg_type field isn't present on monitor frames
* so we don't know whether it will be present or not,
* but it's ok to not clear it since it'll be assigned
* anyway */
memset(fi, 0, sizeof(*fi) - sizeof(fi->msg_type));
fi->ssi_type = htonl(ieee80211_ssi_none);
}
fi->version = htonl(IEEE80211_FI_VERSION);
fi->length = cpu_to_be32(sizeof(*fi) - sizeof(fi->msg_type));
}
/* this routine is actually not just for this, but also
* for pushing fake 'management' frames into userspace.
* it shall be replaced by a netlink-based system. */
void
ieee80211_rx_mgmt(struct ieee80211_local *local, struct sk_buff *skb,
struct ieee80211_rx_status *status, u32 msg_type)
{
struct ieee80211_frame_info *fi;
const size_t hlen = sizeof(struct ieee80211_frame_info);
struct ieee80211_sub_if_data *sdata;
skb->dev = local->apdev;
sdata = IEEE80211_DEV_TO_SUB_IF(local->apdev);
if (skb_headroom(skb) < hlen) {
I802_DEBUG_INC(local->rx_expand_skb_head);
if (pskb_expand_head(skb, hlen, 0, GFP_ATOMIC)) {
dev_kfree_skb(skb);
return;
}
}
fi = (struct ieee80211_frame_info *) skb_push(skb, hlen);
ieee80211_fill_frame_info(local, fi, status);
fi->msg_type = htonl(msg_type);
sdata->stats.rx_packets++;
sdata->stats.rx_bytes += skb->len;
skb_set_mac_header(skb, 0);
skb->ip_summed = CHECKSUM_UNNECESSARY;
skb->pkt_type = PACKET_OTHERHOST;
skb->protocol = htons(ETH_P_802_2);
memset(skb->cb, 0, sizeof(skb->cb));
netif_rx(skb);
}
int ieee80211_radar_status(struct ieee80211_hw *hw, int channel,
int radar, int radar_type)
{
struct sk_buff *skb;
struct ieee80211_radar_info *msg;
struct ieee80211_local *local = hw_to_local(hw);
if (!local->apdev)
return 0;
skb = dev_alloc_skb(sizeof(struct ieee80211_frame_info) +
sizeof(struct ieee80211_radar_info));
if (!skb)
return -ENOMEM;
skb_reserve(skb, sizeof(struct ieee80211_frame_info));
msg = (struct ieee80211_radar_info *)
skb_put(skb, sizeof(struct ieee80211_radar_info));
msg->channel = channel;
msg->radar = radar;
msg->radar_type = radar_type;
ieee80211_rx_mgmt(local, skb, NULL, ieee80211_msg_radar);
return 0;
}
EXPORT_SYMBOL(ieee80211_radar_status);
void ieee80211_key_threshold_notify(struct net_device *dev,
struct ieee80211_key *key,
......@@ -186,389 +281,277 @@ void ieee80211_key_threshold_notify(struct net_device *dev,
ieee80211_msg_key_threshold_notification);
}
u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len)
static int ieee80211_mgmt_open(struct net_device *dev)
{
u16 fc;
if (len < 24)
return NULL;
fc = le16_to_cpu(hdr->frame_control);
switch (fc & IEEE80211_FCTL_FTYPE) {
case IEEE80211_FTYPE_DATA:
switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
case IEEE80211_FCTL_TODS:
return hdr->addr1;
case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
return NULL;
case IEEE80211_FCTL_FROMDS:
return hdr->addr2;
case 0:
return hdr->addr3;
}
break;
case IEEE80211_FTYPE_MGMT:
return hdr->addr3;
case IEEE80211_FTYPE_CTL:
if ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)
return hdr->addr1;
else
return NULL;
}
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
return NULL;
if (!netif_running(local->mdev))
return -EOPNOTSUPP;
return 0;
}
int ieee80211_get_hdrlen(u16 fc)
static int ieee80211_mgmt_stop(struct net_device *dev)
{
int hdrlen = 24;
return 0;
}
switch (fc & IEEE80211_FCTL_FTYPE) {
case IEEE80211_FTYPE_DATA:
if ((fc & IEEE80211_FCTL_FROMDS) && (fc & IEEE80211_FCTL_TODS))
hdrlen = 30; /* Addr4 */
/*
* The QoS Control field is two bytes and its presence is
* indicated by the IEEE80211_STYPE_QOS_DATA bit. Add 2 to
* hdrlen if that bit is set.
* This works by masking out the bit and shifting it to
* bit position 1 so the result has the value 0 or 2.
*/
hdrlen += (fc & IEEE80211_STYPE_QOS_DATA)
>> (ilog2(IEEE80211_STYPE_QOS_DATA)-1);
break;
case IEEE80211_FTYPE_CTL:
/*
* ACK and CTS are 10 bytes, all others 16. To see how
* to get this condition consider
* subtype mask: 0b0000000011110000 (0x00F0)
* ACK subtype: 0b0000000011010000 (0x00D0)
* CTS subtype: 0b0000000011000000 (0x00C0)
* bits that matter: ^^^ (0x00E0)
* value of those: 0b0000000011000000 (0x00C0)
*/
if ((fc & 0xE0) == 0xC0)
hdrlen = 10;
else
hdrlen = 16;
break;
static int ieee80211_change_mtu_apdev(struct net_device *dev, int new_mtu)
{
/* FIX: what would be proper limits for MTU?
* This interface uses 802.11 frames. */
if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN) {
printk(KERN_WARNING "%s: invalid MTU %d\n",
dev->name, new_mtu);
return -EINVAL;
}
return hdrlen;
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
dev->mtu = new_mtu;
return 0;
}
EXPORT_SYMBOL(ieee80211_get_hdrlen);
int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
void ieee80211_if_mgmt_setup(struct net_device *dev)
{
const struct ieee80211_hdr *hdr = (const struct ieee80211_hdr *) skb->data;
int hdrlen;
if (unlikely(skb->len < 10))
return 0;
hdrlen = ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control));
if (unlikely(hdrlen > skb->len))
return 0;
return hdrlen;
ether_setup(dev);
dev->hard_start_xmit = ieee80211_mgmt_start_xmit;
dev->change_mtu = ieee80211_change_mtu_apdev;
dev->get_stats = ieee80211_get_stats;
dev->open = ieee80211_mgmt_open;
dev->stop = ieee80211_mgmt_stop;
dev->type = ARPHRD_IEEE80211_PRISM;
dev->hard_header_parse = header_parse_80211;
dev->uninit = ieee80211_if_reinit;
dev->destructor = ieee80211_if_free;
}
EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
/* regular interfaces */
int ieee80211_is_eapol(const struct sk_buff *skb)
static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
{
const struct ieee80211_hdr *hdr;
u16 fc;
int hdrlen;
if (unlikely(skb->len < 10))
return 0;
hdr = (const struct ieee80211_hdr *) skb->data;
fc = le16_to_cpu(hdr->frame_control);
if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
return 0;
hdrlen = ieee80211_get_hdrlen(fc);
if (unlikely(skb->len >= hdrlen + sizeof(eapol_header) &&
memcmp(skb->data + hdrlen, eapol_header,
sizeof(eapol_header)) == 0))
return 1;
/* FIX: what would be proper limits for MTU?
* This interface uses 802.3 frames. */
if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6) {
printk(KERN_WARNING "%s: invalid MTU %d\n",
dev->name, new_mtu);
return -EINVAL;
}
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
dev->mtu = new_mtu;
return 0;
}
static inline int identical_mac_addr_allowed(int type1, int type2)
{
return (type1 == IEEE80211_IF_TYPE_MNTR ||
type2 == IEEE80211_IF_TYPE_MNTR ||
(type1 == IEEE80211_IF_TYPE_AP &&
type2 == IEEE80211_IF_TYPE_WDS) ||
(type1 == IEEE80211_IF_TYPE_WDS &&
(type2 == IEEE80211_IF_TYPE_WDS ||
type2 == IEEE80211_IF_TYPE_AP)) ||
(type1 == IEEE80211_IF_TYPE_AP &&
type2 == IEEE80211_IF_TYPE_VLAN) ||
(type1 == IEEE80211_IF_TYPE_VLAN &&
(type2 == IEEE80211_IF_TYPE_AP ||
type2 == IEEE80211_IF_TYPE_VLAN)));
}
void ieee80211_tx_set_iswep(struct ieee80211_txrx_data *tx)
/* Check if running monitor interfaces should go to a "soft monitor" mode
* and switch them if necessary. */
static inline void ieee80211_start_soft_monitor(struct ieee80211_local *local)
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
struct ieee80211_if_init_conf conf;
hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
if (tx->u.tx.extra_frag) {
struct ieee80211_hdr *fhdr;
int i;
for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
fhdr = (struct ieee80211_hdr *)
tx->u.tx.extra_frag[i]->data;
fhdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
}
if (local->open_count && local->open_count == local->monitors &&
!(local->hw.flags & IEEE80211_HW_MONITOR_DURING_OPER) &&
local->ops->remove_interface) {
conf.if_id = -1;
conf.type = IEEE80211_IF_TYPE_MNTR;
conf.mac_addr = NULL;
local->ops->remove_interface(local_to_hw(local), &conf);
}
}
static int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
int rate, int erp, int short_preamble)
/* Check if running monitor interfaces should go to a "hard monitor" mode
* and switch them if necessary. */
static void ieee80211_start_hard_monitor(struct ieee80211_local *local)
{
int dur;
/* calculate duration (in microseconds, rounded up to next higher
* integer if it includes a fractional microsecond) to send frame of
* len bytes (does not include FCS) at the given rate. Duration will
* also include SIFS.
*
* rate is in 100 kbps, so divident is multiplied by 10 in the
* DIV_ROUND_UP() operations.
*/
if (local->hw.conf.phymode == MODE_IEEE80211A || erp ||
local->hw.conf.phymode == MODE_ATHEROS_TURBO) {
/*
* OFDM:
*
* N_DBPS = DATARATE x 4
* N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
* (16 = SIGNAL time, 6 = tail bits)
* TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
*
* T_SYM = 4 usec
* 802.11a - 17.5.2: aSIFSTime = 16 usec
* 802.11g - 19.8.4: aSIFSTime = 10 usec +
* signal ext = 6 usec
*/
/* FIX: Atheros Turbo may have different (shorter) duration? */
dur = 16; /* SIFS + signal ext */
dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
4 * rate); /* T_SYM x N_SYM */
} else {
/*
* 802.11b or 802.11g with 802.11b compatibility:
* 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
* Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
*
* 802.11 (DS): 15.3.3, 802.11b: 18.3.4
* aSIFSTime = 10 usec
* aPreambleLength = 144 usec or 72 usec with short preamble
* aPLCPHeaderLength = 48 usec or 24 usec with short preamble
*/
dur = 10; /* aSIFSTime = 10 usec */
dur += short_preamble ? (72 + 24) : (144 + 48);
struct ieee80211_if_init_conf conf;
dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
if (local->open_count && local->open_count == local->monitors &&
!(local->hw.flags & IEEE80211_HW_MONITOR_DURING_OPER)) {
conf.if_id = -1;
conf.type = IEEE80211_IF_TYPE_MNTR;
conf.mac_addr = NULL;
local->ops->add_interface(local_to_hw(local), &conf);
}
return dur;
}
/* Exported duration function for driver use */
__le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
size_t frame_len, int rate)
static int ieee80211_open(struct net_device *dev)
{
struct ieee80211_local *local = hw_to_local(hw);
u16 dur;
int erp;
erp = ieee80211_is_erp_rate(hw->conf.phymode, rate);
dur = ieee80211_frame_duration(local, frame_len, rate,
erp, local->short_preamble);
struct ieee80211_sub_if_data *sdata, *nsdata;
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct ieee80211_if_init_conf conf;
int res;
return cpu_to_le16(dur);
}
EXPORT_SYMBOL(ieee80211_generic_frame_duration);
sdata = IEEE80211_DEV_TO_SUB_IF(dev);
read_lock(&local->sub_if_lock);
list_for_each_entry(nsdata, &local->sub_if_list, list) {
struct net_device *ndev = nsdata->dev;
if (ndev != dev && ndev != local->mdev && netif_running(ndev) &&
compare_ether_addr(dev->dev_addr, ndev->dev_addr) == 0 &&
!identical_mac_addr_allowed(sdata->type, nsdata->type)) {
read_unlock(&local->sub_if_lock);
return -ENOTUNIQ;
}
}
read_unlock(&local->sub_if_lock);
__le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
size_t frame_len,
const struct ieee80211_tx_control *frame_txctl)
{
struct ieee80211_local *local = hw_to_local(hw);
struct ieee80211_rate *rate;
int short_preamble = local->short_preamble;
int erp;
u16 dur;
if (sdata->type == IEEE80211_IF_TYPE_WDS &&
is_zero_ether_addr(sdata->u.wds.remote_addr))
return -ENOLINK;
rate = frame_txctl->rts_rate;
erp = !!(rate->flags & IEEE80211_RATE_ERP);
/* CTS duration */
dur = ieee80211_frame_duration(local, 10, rate->rate,
erp, short_preamble);
/* Data frame duration */
dur += ieee80211_frame_duration(local, frame_len, rate->rate,
erp, short_preamble);
/* ACK duration */
dur += ieee80211_frame_duration(local, 10, rate->rate,
erp, short_preamble);
return cpu_to_le16(dur);
}
EXPORT_SYMBOL(ieee80211_rts_duration);
if (sdata->type == IEEE80211_IF_TYPE_MNTR && local->open_count &&
!(local->hw.flags & IEEE80211_HW_MONITOR_DURING_OPER)) {
/* run the interface in a "soft monitor" mode */
local->monitors++;
local->open_count++;
local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
return 0;
}
ieee80211_start_soft_monitor(local);
conf.if_id = dev->ifindex;
conf.type = sdata->type;
conf.mac_addr = dev->dev_addr;
res = local->ops->add_interface(local_to_hw(local), &conf);
if (res) {
if (sdata->type == IEEE80211_IF_TYPE_MNTR)
ieee80211_start_hard_monitor(local);
return res;