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util.c
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/*
* Wireless utility functions
*
* Copyright 2007-2009 Johannes Berg <johannes@sipsolutions.net>
* Copyright 2013-2014 Intel Mobile Communications GmbH
*/
#include <linux/export.h>
#include <linux/bitops.h>
#include <linux/etherdevice.h>
#include <linux/slab.h>
#include <net/cfg80211.h>
#include <net/ip.h>
#include <net/dsfield.h>
#include <linux/if_vlan.h>
#include <linux/mpls.h>
#include <linux/gcd.h>
#include "core.h"
#include "rdev-ops.h"
struct ieee80211_rate *
ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
u32 basic_rates, int bitrate)
{
struct ieee80211_rate *result = &sband->bitrates[0];
int i;
for (i = 0; i < sband->n_bitrates; i++) {
if (!(basic_rates & BIT(i)))
continue;
if (sband->bitrates[i].bitrate > bitrate)
continue;
result = &sband->bitrates[i];
}
return result;
}
EXPORT_SYMBOL(ieee80211_get_response_rate);
u32 ieee80211_mandatory_rates(struct ieee80211_supported_band *sband,
enum nl80211_bss_scan_width scan_width)
{
struct ieee80211_rate *bitrates;
u32 mandatory_rates = 0;
enum ieee80211_rate_flags mandatory_flag;
int i;
if (WARN_ON(!sband))
return 1;
if (sband->band == NL80211_BAND_2GHZ) {
if (scan_width == NL80211_BSS_CHAN_WIDTH_5 ||
scan_width == NL80211_BSS_CHAN_WIDTH_10)
mandatory_flag = IEEE80211_RATE_MANDATORY_G;
else
mandatory_flag = IEEE80211_RATE_MANDATORY_B;
} else {
mandatory_flag = IEEE80211_RATE_MANDATORY_A;
}
bitrates = sband->bitrates;
for (i = 0; i < sband->n_bitrates; i++)
if (bitrates[i].flags & mandatory_flag)
mandatory_rates |= BIT(i);
return mandatory_rates;
}
EXPORT_SYMBOL(ieee80211_mandatory_rates);
int ieee80211_channel_to_frequency(int chan, enum nl80211_band band)
{
/* see 802.11 17.3.8.3.2 and Annex J
* there are overlapping channel numbers in 5GHz and 2GHz bands */
if (chan <= 0)
return 0; /* not supported */
switch (band) {
case NL80211_BAND_2GHZ:
if (chan == 14)
return 2484;
else if (chan < 14)
return 2407 + chan * 5;
break;
case NL80211_BAND_5GHZ:
if (chan >= 182 && chan <= 196)
return 4000 + chan * 5;
else
return 5000 + chan * 5;
break;
case NL80211_BAND_60GHZ:
if (chan < 5)
return 56160 + chan * 2160;
break;
default:
;
}
return 0; /* not supported */
}
EXPORT_SYMBOL(ieee80211_channel_to_frequency);
int ieee80211_frequency_to_channel(int freq)
{
/* see 802.11 17.3.8.3.2 and Annex J */
if (freq == 2484)
return 14;
else if (freq < 2484)
return (freq - 2407) / 5;
else if (freq >= 4910 && freq <= 4980)
return (freq - 4000) / 5;
else if (freq <= 45000) /* DMG band lower limit */
return (freq - 5000) / 5;
else if (freq >= 58320 && freq <= 64800)
return (freq - 56160) / 2160;
else
return 0;
}
EXPORT_SYMBOL(ieee80211_frequency_to_channel);
struct ieee80211_channel *ieee80211_get_channel(struct wiphy *wiphy, int freq)
{
enum nl80211_band band;
struct ieee80211_supported_band *sband;
int i;
for (band = 0; band < NUM_NL80211_BANDS; band++) {
sband = wiphy->bands[band];
if (!sband)
continue;
for (i = 0; i < sband->n_channels; i++) {
if (sband->channels[i].center_freq == freq)
return &sband->channels[i];
}
}
return NULL;
}
EXPORT_SYMBOL(ieee80211_get_channel);
static void set_mandatory_flags_band(struct ieee80211_supported_band *sband)
{
int i, want;
switch (sband->band) {
case NL80211_BAND_5GHZ:
want = 3;
for (i = 0; i < sband->n_bitrates; i++) {
if (sband->bitrates[i].bitrate == 60 ||
sband->bitrates[i].bitrate == 120 ||
sband->bitrates[i].bitrate == 240) {
sband->bitrates[i].flags |=
IEEE80211_RATE_MANDATORY_A;
want--;
}
}
WARN_ON(want);
break;
case NL80211_BAND_2GHZ:
want = 7;
for (i = 0; i < sband->n_bitrates; i++) {
if (sband->bitrates[i].bitrate == 10) {
sband->bitrates[i].flags |=
IEEE80211_RATE_MANDATORY_B |
IEEE80211_RATE_MANDATORY_G;
want--;
}
if (sband->bitrates[i].bitrate == 20 ||
sband->bitrates[i].bitrate == 55 ||
sband->bitrates[i].bitrate == 110 ||
sband->bitrates[i].bitrate == 60 ||
sband->bitrates[i].bitrate == 120 ||
sband->bitrates[i].bitrate == 240) {
sband->bitrates[i].flags |=
IEEE80211_RATE_MANDATORY_G;
want--;
}
if (sband->bitrates[i].bitrate != 10 &&
sband->bitrates[i].bitrate != 20 &&
sband->bitrates[i].bitrate != 55 &&
sband->bitrates[i].bitrate != 110)
sband->bitrates[i].flags |=
IEEE80211_RATE_ERP_G;
}
WARN_ON(want != 0 && want != 3 && want != 6);
break;
case NL80211_BAND_60GHZ:
/* check for mandatory HT MCS 1..4 */
WARN_ON(!sband->ht_cap.ht_supported);
WARN_ON((sband->ht_cap.mcs.rx_mask[0] & 0x1e) != 0x1e);
break;
case NUM_NL80211_BANDS:
default:
WARN_ON(1);
break;
}
}
void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
{
enum nl80211_band band;
for (band = 0; band < NUM_NL80211_BANDS; band++)
if (wiphy->bands[band])
set_mandatory_flags_band(wiphy->bands[band]);
}
bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher)
{
int i;
for (i = 0; i < wiphy->n_cipher_suites; i++)
if (cipher == wiphy->cipher_suites[i])
return true;
return false;
}
int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
struct key_params *params, int key_idx,
bool pairwise, const u8 *mac_addr)
{
if (key_idx < 0 || key_idx > 5)
return -EINVAL;
if (!pairwise && mac_addr && !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN))
return -EINVAL;
if (pairwise && !mac_addr)
return -EINVAL;
switch (params->cipher) {
case WLAN_CIPHER_SUITE_TKIP:
case WLAN_CIPHER_SUITE_CCMP:
case WLAN_CIPHER_SUITE_CCMP_256:
case WLAN_CIPHER_SUITE_GCMP:
case WLAN_CIPHER_SUITE_GCMP_256:
/* Disallow pairwise keys with non-zero index unless it's WEP
* or a vendor specific cipher (because current deployments use
* pairwise WEP keys with non-zero indices and for vendor
* specific ciphers this should be validated in the driver or
* hardware level - but 802.11i clearly specifies to use zero)
*/
if (pairwise && key_idx)
return -EINVAL;
break;
case WLAN_CIPHER_SUITE_AES_CMAC:
case WLAN_CIPHER_SUITE_BIP_CMAC_256:
case WLAN_CIPHER_SUITE_BIP_GMAC_128:
case WLAN_CIPHER_SUITE_BIP_GMAC_256:
/* Disallow BIP (group-only) cipher as pairwise cipher */
if (pairwise)
return -EINVAL;
if (key_idx < 4)
return -EINVAL;
break;
case WLAN_CIPHER_SUITE_WEP40:
case WLAN_CIPHER_SUITE_WEP104:
if (key_idx > 3)
return -EINVAL;
default:
break;
}
switch (params->cipher) {
case WLAN_CIPHER_SUITE_WEP40:
if (params->key_len != WLAN_KEY_LEN_WEP40)
return -EINVAL;
break;
case WLAN_CIPHER_SUITE_TKIP:
if (params->key_len != WLAN_KEY_LEN_TKIP)
return -EINVAL;
break;
case WLAN_CIPHER_SUITE_CCMP:
if (params->key_len != WLAN_KEY_LEN_CCMP)
return -EINVAL;
break;
case WLAN_CIPHER_SUITE_CCMP_256:
if (params->key_len != WLAN_KEY_LEN_CCMP_256)
return -EINVAL;
break;
case WLAN_CIPHER_SUITE_GCMP:
if (params->key_len != WLAN_KEY_LEN_GCMP)
return -EINVAL;
break;
case WLAN_CIPHER_SUITE_GCMP_256:
if (params->key_len != WLAN_KEY_LEN_GCMP_256)
return -EINVAL;
break;
case WLAN_CIPHER_SUITE_WEP104:
if (params->key_len != WLAN_KEY_LEN_WEP104)
return -EINVAL;
break;
case WLAN_CIPHER_SUITE_AES_CMAC:
if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
return -EINVAL;
break;
case WLAN_CIPHER_SUITE_BIP_CMAC_256:
if (params->key_len != WLAN_KEY_LEN_BIP_CMAC_256)
return -EINVAL;
break;
case WLAN_CIPHER_SUITE_BIP_GMAC_128:
if (params->key_len != WLAN_KEY_LEN_BIP_GMAC_128)
return -EINVAL;
break;
case WLAN_CIPHER_SUITE_BIP_GMAC_256:
if (params->key_len != WLAN_KEY_LEN_BIP_GMAC_256)
return -EINVAL;
break;
default:
/*
* We don't know anything about this algorithm,
* allow using it -- but the driver must check
* all parameters! We still check below whether
* or not the driver supports this algorithm,
* of course.
*/
break;
}
if (params->seq) {
switch (params->cipher) {
case WLAN_CIPHER_SUITE_WEP40:
case WLAN_CIPHER_SUITE_WEP104:
/* These ciphers do not use key sequence */
return -EINVAL;
case WLAN_CIPHER_SUITE_TKIP:
case WLAN_CIPHER_SUITE_CCMP:
case WLAN_CIPHER_SUITE_CCMP_256:
case WLAN_CIPHER_SUITE_GCMP:
case WLAN_CIPHER_SUITE_GCMP_256:
case WLAN_CIPHER_SUITE_AES_CMAC:
case WLAN_CIPHER_SUITE_BIP_CMAC_256:
case WLAN_CIPHER_SUITE_BIP_GMAC_128:
case WLAN_CIPHER_SUITE_BIP_GMAC_256:
if (params->seq_len != 6)
return -EINVAL;
break;
}
}
if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher))
return -EINVAL;
return 0;
}
unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
{
unsigned int hdrlen = 24;
if (ieee80211_is_data(fc)) {
if (ieee80211_has_a4(fc))
hdrlen = 30;
if (ieee80211_is_data_qos(fc)) {
hdrlen += IEEE80211_QOS_CTL_LEN;
if (ieee80211_has_order(fc))
hdrlen += IEEE80211_HT_CTL_LEN;
}
goto out;
}
if (ieee80211_is_mgmt(fc)) {
if (ieee80211_has_order(fc))
hdrlen += IEEE80211_HT_CTL_LEN;
goto out;
}
if (ieee80211_is_ctl(fc)) {
/*
* 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 & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
hdrlen = 10;
else
hdrlen = 16;
}
out:
return hdrlen;
}
EXPORT_SYMBOL(ieee80211_hdrlen);
unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
{
const struct ieee80211_hdr *hdr =
(const struct ieee80211_hdr *)skb->data;
unsigned int hdrlen;
if (unlikely(skb->len < 10))
return 0;
hdrlen = ieee80211_hdrlen(hdr->frame_control);
if (unlikely(hdrlen > skb->len))
return 0;
return hdrlen;
}
EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
static unsigned int __ieee80211_get_mesh_hdrlen(u8 flags)
{
int ae = flags & MESH_FLAGS_AE;
/* 802.11-2012, 8.2.4.7.3 */
switch (ae) {
default:
case 0:
return 6;
case MESH_FLAGS_AE_A4:
return 12;
case MESH_FLAGS_AE_A5_A6:
return 18;
}
}
unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
{
return __ieee80211_get_mesh_hdrlen(meshhdr->flags);
}
EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen);
int ieee80211_data_to_8023_exthdr(struct sk_buff *skb, struct ethhdr *ehdr,
const u8 *addr, enum nl80211_iftype iftype)
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
struct {
u8 hdr[ETH_ALEN] __aligned(2);
__be16 proto;
} payload;
struct ethhdr tmp;
u16 hdrlen;
u8 mesh_flags = 0;
if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
return -1;
hdrlen = ieee80211_hdrlen(hdr->frame_control);
if (skb->len < hdrlen + 8)
return -1;
/* convert IEEE 802.11 header + possible LLC headers into Ethernet
* header
* IEEE 802.11 address fields:
* ToDS FromDS Addr1 Addr2 Addr3 Addr4
* 0 0 DA SA BSSID n/a
* 0 1 DA BSSID SA n/a
* 1 0 BSSID SA DA n/a
* 1 1 RA TA DA SA
*/
memcpy(tmp.h_dest, ieee80211_get_DA(hdr), ETH_ALEN);
memcpy(tmp.h_source, ieee80211_get_SA(hdr), ETH_ALEN);
if (iftype == NL80211_IFTYPE_MESH_POINT)
skb_copy_bits(skb, hdrlen, &mesh_flags, 1);
switch (hdr->frame_control &
cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
case cpu_to_le16(IEEE80211_FCTL_TODS):
if (unlikely(iftype != NL80211_IFTYPE_AP &&
iftype != NL80211_IFTYPE_AP_VLAN &&
iftype != NL80211_IFTYPE_P2P_GO))
return -1;
break;
case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
if (unlikely(iftype != NL80211_IFTYPE_WDS &&
iftype != NL80211_IFTYPE_MESH_POINT &&
iftype != NL80211_IFTYPE_AP_VLAN &&
iftype != NL80211_IFTYPE_STATION))
return -1;
if (iftype == NL80211_IFTYPE_MESH_POINT) {
if (mesh_flags & MESH_FLAGS_AE_A4)
return -1;
if (mesh_flags & MESH_FLAGS_AE_A5_A6) {
skb_copy_bits(skb, hdrlen +
offsetof(struct ieee80211s_hdr, eaddr1),
tmp.h_dest, 2 * ETH_ALEN);
}
hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags);
}
break;
case cpu_to_le16(IEEE80211_FCTL_FROMDS):
if ((iftype != NL80211_IFTYPE_STATION &&
iftype != NL80211_IFTYPE_P2P_CLIENT &&
iftype != NL80211_IFTYPE_MESH_POINT) ||
(is_multicast_ether_addr(tmp.h_dest) &&
ether_addr_equal(tmp.h_source, addr)))
return -1;
if (iftype == NL80211_IFTYPE_MESH_POINT) {
if (mesh_flags & MESH_FLAGS_AE_A5_A6)
return -1;
if (mesh_flags & MESH_FLAGS_AE_A4)
skb_copy_bits(skb, hdrlen +
offsetof(struct ieee80211s_hdr, eaddr1),
tmp.h_source, ETH_ALEN);
hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags);
}
break;
case cpu_to_le16(0):
if (iftype != NL80211_IFTYPE_ADHOC &&
iftype != NL80211_IFTYPE_STATION &&
iftype != NL80211_IFTYPE_OCB)
return -1;
break;
}
skb_copy_bits(skb, hdrlen, &payload, sizeof(payload));
tmp.h_proto = payload.proto;
if (likely((ether_addr_equal(payload.hdr, rfc1042_header) &&
tmp.h_proto != htons(ETH_P_AARP) &&
tmp.h_proto != htons(ETH_P_IPX)) ||
ether_addr_equal(payload.hdr, bridge_tunnel_header)))
/* remove RFC1042 or Bridge-Tunnel encapsulation and
* replace EtherType */
hdrlen += ETH_ALEN + 2;
else
tmp.h_proto = htons(skb->len - hdrlen);
pskb_pull(skb, hdrlen);
if (!ehdr)
ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
memcpy(ehdr, &tmp, sizeof(tmp));
return 0;
}
EXPORT_SYMBOL(ieee80211_data_to_8023_exthdr);
int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr,
enum nl80211_iftype iftype,
const u8 *bssid, bool qos)
{
struct ieee80211_hdr hdr;
u16 hdrlen, ethertype;
__le16 fc;
const u8 *encaps_data;
int encaps_len, skip_header_bytes;
int nh_pos, h_pos;
int head_need;
if (unlikely(skb->len < ETH_HLEN))
return -EINVAL;
nh_pos = skb_network_header(skb) - skb->data;
h_pos = skb_transport_header(skb) - skb->data;
/* convert Ethernet header to proper 802.11 header (based on
* operation mode) */
ethertype = (skb->data[12] << 8) | skb->data[13];
fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
switch (iftype) {
case NL80211_IFTYPE_AP:
case NL80211_IFTYPE_AP_VLAN:
case NL80211_IFTYPE_P2P_GO:
fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
/* DA BSSID SA */
memcpy(hdr.addr1, skb->data, ETH_ALEN);
memcpy(hdr.addr2, addr, ETH_ALEN);
memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
hdrlen = 24;
break;
case NL80211_IFTYPE_STATION:
case NL80211_IFTYPE_P2P_CLIENT:
fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
/* BSSID SA DA */
memcpy(hdr.addr1, bssid, ETH_ALEN);
memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
memcpy(hdr.addr3, skb->data, ETH_ALEN);
hdrlen = 24;
break;
case NL80211_IFTYPE_OCB:
case NL80211_IFTYPE_ADHOC:
/* DA SA BSSID */
memcpy(hdr.addr1, skb->data, ETH_ALEN);
memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
memcpy(hdr.addr3, bssid, ETH_ALEN);
hdrlen = 24;
break;
default:
return -EOPNOTSUPP;
}
if (qos) {
fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
hdrlen += 2;
}
hdr.frame_control = fc;
hdr.duration_id = 0;
hdr.seq_ctrl = 0;
skip_header_bytes = ETH_HLEN;
if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
encaps_data = bridge_tunnel_header;
encaps_len = sizeof(bridge_tunnel_header);
skip_header_bytes -= 2;
} else if (ethertype >= ETH_P_802_3_MIN) {
encaps_data = rfc1042_header;
encaps_len = sizeof(rfc1042_header);
skip_header_bytes -= 2;
} else {
encaps_data = NULL;
encaps_len = 0;
}
skb_pull(skb, skip_header_bytes);
nh_pos -= skip_header_bytes;
h_pos -= skip_header_bytes;
head_need = hdrlen + encaps_len - skb_headroom(skb);
if (head_need > 0 || skb_cloned(skb)) {
head_need = max(head_need, 0);
if (head_need)
skb_orphan(skb);
if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC))
return -ENOMEM;
}
if (encaps_data) {
memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
nh_pos += encaps_len;
h_pos += encaps_len;
}
memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
nh_pos += hdrlen;
h_pos += hdrlen;
/* Update skb pointers to various headers since this modified frame
* is going to go through Linux networking code that may potentially
* need things like pointer to IP header. */
skb_reset_mac_header(skb);
skb_set_network_header(skb, nh_pos);
skb_set_transport_header(skb, h_pos);
return 0;
}
EXPORT_SYMBOL(ieee80211_data_from_8023);
static void
__frame_add_frag(struct sk_buff *skb, struct page *page,
void *ptr, int len, int size)
{
struct skb_shared_info *sh = skb_shinfo(skb);
int page_offset;
page_ref_inc(page);
page_offset = ptr - page_address(page);
skb_add_rx_frag(skb, sh->nr_frags, page, page_offset, len, size);
}
static void
__ieee80211_amsdu_copy_frag(struct sk_buff *skb, struct sk_buff *frame,
int offset, int len)
{
struct skb_shared_info *sh = skb_shinfo(skb);
const skb_frag_t *frag = &sh->frags[0];
struct page *frag_page;
void *frag_ptr;
int frag_len, frag_size;
int head_size = skb->len - skb->data_len;
int cur_len;
frag_page = virt_to_head_page(skb->head);
frag_ptr = skb->data;
frag_size = head_size;
while (offset >= frag_size) {
offset -= frag_size;
frag_page = skb_frag_page(frag);
frag_ptr = skb_frag_address(frag);
frag_size = skb_frag_size(frag);
frag++;
}
frag_ptr += offset;
frag_len = frag_size - offset;
cur_len = min(len, frag_len);
__frame_add_frag(frame, frag_page, frag_ptr, cur_len, frag_size);
len -= cur_len;
while (len > 0) {
frag_len = skb_frag_size(frag);
cur_len = min(len, frag_len);
__frame_add_frag(frame, skb_frag_page(frag),
skb_frag_address(frag), cur_len, frag_len);
len -= cur_len;
frag++;
}
}
static struct sk_buff *
__ieee80211_amsdu_copy(struct sk_buff *skb, unsigned int hlen,
int offset, int len, bool reuse_frag)
{
struct sk_buff *frame;
int cur_len = len;
if (skb->len - offset < len)
return NULL;
/*
* When reusing framents, copy some data to the head to simplify
* ethernet header handling and speed up protocol header processing
* in the stack later.
*/
if (reuse_frag)
cur_len = min_t(int, len, 32);
/*
* Allocate and reserve two bytes more for payload
* alignment since sizeof(struct ethhdr) is 14.
*/
frame = dev_alloc_skb(hlen + sizeof(struct ethhdr) + 2 + cur_len);
if (!frame)
return NULL;
skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
skb_copy_bits(skb, offset, skb_put(frame, cur_len), cur_len);
len -= cur_len;
if (!len)
return frame;
offset += cur_len;
__ieee80211_amsdu_copy_frag(skb, frame, offset, len);
return frame;
}
void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
const u8 *addr, enum nl80211_iftype iftype,
const unsigned int extra_headroom,
const u8 *check_da, const u8 *check_sa)
{
unsigned int hlen = ALIGN(extra_headroom, 4);
struct sk_buff *frame = NULL;
u16 ethertype;
u8 *payload;
int offset = 0, remaining;
struct ethhdr eth;
bool reuse_frag = skb->head_frag && !skb_has_frag_list(skb);
bool reuse_skb = false;
bool last = false;
while (!last) {
unsigned int subframe_len;
int len;
u8 padding;
skb_copy_bits(skb, offset, ð, sizeof(eth));
len = ntohs(eth.h_proto);
subframe_len = sizeof(struct ethhdr) + len;
padding = (4 - subframe_len) & 0x3;
/* the last MSDU has no padding */
remaining = skb->len - offset;
if (subframe_len > remaining)
goto purge;
offset += sizeof(struct ethhdr);
last = remaining <= subframe_len + padding;
/* FIXME: should we really accept multicast DA? */
if ((check_da && !is_multicast_ether_addr(eth.h_dest) &&
!ether_addr_equal(check_da, eth.h_dest)) ||
(check_sa && !ether_addr_equal(check_sa, eth.h_source))) {
offset += len + padding;
continue;
}
/* reuse skb for the last subframe */
if (!skb_is_nonlinear(skb) && !reuse_frag && last) {
skb_pull(skb, offset);
frame = skb;
reuse_skb = true;
} else {
frame = __ieee80211_amsdu_copy(skb, hlen, offset, len,
reuse_frag);
if (!frame)
goto purge;
offset += len + padding;
}
skb_reset_network_header(frame);
frame->dev = skb->dev;
frame->priority = skb->priority;
payload = frame->data;
ethertype = (payload[6] << 8) | payload[7];
if (likely((ether_addr_equal(payload, rfc1042_header) &&
ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
ether_addr_equal(payload, bridge_tunnel_header))) {
eth.h_proto = htons(ethertype);
skb_pull(frame, ETH_ALEN + 2);
}
memcpy(skb_push(frame, sizeof(eth)), ð, sizeof(eth));
__skb_queue_tail(list, frame);
}
if (!reuse_skb)
dev_kfree_skb(skb);
return;
purge:
__skb_queue_purge(list);
dev_kfree_skb(skb);
}
EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
/* Given a data frame determine the 802.1p/1d tag to use. */
unsigned int cfg80211_classify8021d(struct sk_buff *skb,
struct cfg80211_qos_map *qos_map)
{
unsigned int dscp;
unsigned char vlan_priority;
/* skb->priority values from 256->263 are magic values to
* directly indicate a specific 802.1d priority. This is used
* to allow 802.1d priority to be passed directly in from VLAN
* tags, etc.
*/
if (skb->priority >= 256 && skb->priority <= 263)
return skb->priority - 256;
if (skb_vlan_tag_present(skb)) {
vlan_priority = (skb_vlan_tag_get(skb) & VLAN_PRIO_MASK)
>> VLAN_PRIO_SHIFT;
if (vlan_priority > 0)
return vlan_priority;
}
switch (skb->protocol) {
case htons(ETH_P_IP):
dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc;
break;
case htons(ETH_P_IPV6):
dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc;
break;
case htons(ETH_P_MPLS_UC):
case htons(ETH_P_MPLS_MC): {
struct mpls_label mpls_tmp, *mpls;
mpls = skb_header_pointer(skb, sizeof(struct ethhdr),
sizeof(*mpls), &mpls_tmp);
if (!mpls)
return 0;
return (ntohl(mpls->entry) & MPLS_LS_TC_MASK)
>> MPLS_LS_TC_SHIFT;
}
case htons(ETH_P_80221):
/* 802.21 is always network control traffic */
return 7;
default:
return 0;
}
if (qos_map) {
unsigned int i, tmp_dscp = dscp >> 2;
for (i = 0; i < qos_map->num_des; i++) {
if (tmp_dscp == qos_map->dscp_exception[i].dscp)
return qos_map->dscp_exception[i].up;
}
for (i = 0; i < 8; i++) {
if (tmp_dscp >= qos_map->up[i].low &&
tmp_dscp <= qos_map->up[i].high)
return i;
}
}
return dscp >> 5;
}
EXPORT_SYMBOL(cfg80211_classify8021d);
const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
{
const struct cfg80211_bss_ies *ies;
ies = rcu_dereference(bss->ies);
if (!ies)
return NULL;
return cfg80211_find_ie(ie, ies->data, ies->len);
}
EXPORT_SYMBOL(ieee80211_bss_get_ie);
void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
{
struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
struct net_device *dev = wdev->netdev;
int i;
if (!wdev->connect_keys)
return;
for (i = 0; i < CFG80211_MAX_WEP_KEYS; i++) {
if (!wdev->connect_keys->params[i].cipher)
continue;
if (rdev_add_key(rdev, dev, i, false, NULL,
&wdev->connect_keys->params[i])) {
netdev_err(dev, "failed to set key %d\n", i);
continue;
}
if (wdev->connect_keys->def == i &&
rdev_set_default_key(rdev, dev, i, true, true)) {
netdev_err(dev, "failed to set defkey %d\n", i);
continue;
}
}
kzfree(wdev->connect_keys);
wdev->connect_keys = NULL;
}
void cfg80211_process_wdev_events(struct wireless_dev *wdev)
{
struct cfg80211_event *ev;
unsigned long flags;
spin_lock_irqsave(&wdev->event_lock, flags);
while (!list_empty(&wdev->event_list)) {
ev = list_first_entry(&wdev->event_list,
struct cfg80211_event, list);
list_del(&ev->list);
spin_unlock_irqrestore(&wdev->event_lock, flags);
wdev_lock(wdev);
switch (ev->type) {
case EVENT_CONNECT_RESULT:
__cfg80211_connect_result(
wdev->netdev,
&ev->cr,
ev->cr.status == WLAN_STATUS_SUCCESS);
break;
case EVENT_ROAMED:
__cfg80211_roamed(wdev, &ev->rm);
break;
case EVENT_DISCONNECTED:
__cfg80211_disconnected(wdev->netdev,
ev->dc.ie, ev->dc.ie_len,
ev->dc.reason,
!ev->dc.locally_generated);
break;
case EVENT_IBSS_JOINED:
__cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid,
ev->ij.channel);
break;
case EVENT_STOPPED:
__cfg80211_leave(wiphy_to_rdev(wdev->wiphy), wdev);
break;
}
wdev_unlock(wdev);
kfree(ev);
spin_lock_irqsave(&wdev->event_lock, flags);
}
spin_unlock_irqrestore(&wdev->event_lock, flags);
}
void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
{
struct wireless_dev *wdev;
ASSERT_RTNL();
list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list)
cfg80211_process_wdev_events(wdev);
}
int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
struct net_device *dev, enum nl80211_iftype ntype,
struct vif_params *params)
{
int err;
enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
ASSERT_RTNL();
/* don't support changing VLANs, you just re-create them */
if (otype == NL80211_IFTYPE_AP_VLAN)
return -EOPNOTSUPP;
/* cannot change into P2P device or NAN */
if (ntype == NL80211_IFTYPE_P2P_DEVICE ||
ntype == NL80211_IFTYPE_NAN)
return -EOPNOTSUPP;