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nl80211.c
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/*
* This is the new netlink-based wireless configuration interface.
*
* Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net>
*/
#include <linux/if.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/if_ether.h>
#include <linux/ieee80211.h>
#include <linux/nl80211.h>
#include <linux/rtnetlink.h>
#include <linux/netlink.h>
#include <linux/etherdevice.h>
#include <net/net_namespace.h>
#include <net/genetlink.h>
#include <net/cfg80211.h>
#include <net/sock.h>
#include "core.h"
#include "nl80211.h"
#include "reg.h"
/* the netlink family */
static struct genl_family nl80211_fam = {
.id = GENL_ID_GENERATE, /* don't bother with a hardcoded ID */
.name = "nl80211", /* have users key off the name instead */
.hdrsize = 0, /* no private header */
.version = 1, /* no particular meaning now */
.maxattr = NL80211_ATTR_MAX,
.netnsok = true,
};
/* internal helper: get rdev and dev */
static int get_rdev_dev_by_info_ifindex(struct genl_info *info,
struct cfg80211_registered_device **rdev,
struct net_device **dev)
{
struct nlattr **attrs = info->attrs;
int ifindex;
if (!attrs[NL80211_ATTR_IFINDEX])
return -EINVAL;
ifindex = nla_get_u32(attrs[NL80211_ATTR_IFINDEX]);
*dev = dev_get_by_index(genl_info_net(info), ifindex);
if (!*dev)
return -ENODEV;
*rdev = cfg80211_get_dev_from_ifindex(genl_info_net(info), ifindex);
if (IS_ERR(*rdev)) {
dev_put(*dev);
return PTR_ERR(*rdev);
}
return 0;
}
/* policy for the attributes */
static const struct nla_policy nl80211_policy[NL80211_ATTR_MAX+1] = {
[NL80211_ATTR_WIPHY] = { .type = NLA_U32 },
[NL80211_ATTR_WIPHY_NAME] = { .type = NLA_NUL_STRING,
.len = 20-1 },
[NL80211_ATTR_WIPHY_TXQ_PARAMS] = { .type = NLA_NESTED },
[NL80211_ATTR_WIPHY_FREQ] = { .type = NLA_U32 },
[NL80211_ATTR_WIPHY_CHANNEL_TYPE] = { .type = NLA_U32 },
[NL80211_ATTR_WIPHY_RETRY_SHORT] = { .type = NLA_U8 },
[NL80211_ATTR_WIPHY_RETRY_LONG] = { .type = NLA_U8 },
[NL80211_ATTR_WIPHY_FRAG_THRESHOLD] = { .type = NLA_U32 },
[NL80211_ATTR_WIPHY_RTS_THRESHOLD] = { .type = NLA_U32 },
[NL80211_ATTR_WIPHY_COVERAGE_CLASS] = { .type = NLA_U8 },
[NL80211_ATTR_IFTYPE] = { .type = NLA_U32 },
[NL80211_ATTR_IFINDEX] = { .type = NLA_U32 },
[NL80211_ATTR_IFNAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ-1 },
[NL80211_ATTR_MAC] = { .type = NLA_BINARY, .len = ETH_ALEN },
[NL80211_ATTR_PREV_BSSID] = { .type = NLA_BINARY, .len = ETH_ALEN },
[NL80211_ATTR_KEY] = { .type = NLA_NESTED, },
[NL80211_ATTR_KEY_DATA] = { .type = NLA_BINARY,
.len = WLAN_MAX_KEY_LEN },
[NL80211_ATTR_KEY_IDX] = { .type = NLA_U8 },
[NL80211_ATTR_KEY_CIPHER] = { .type = NLA_U32 },
[NL80211_ATTR_KEY_DEFAULT] = { .type = NLA_FLAG },
[NL80211_ATTR_KEY_SEQ] = { .type = NLA_BINARY, .len = 8 },
[NL80211_ATTR_BEACON_INTERVAL] = { .type = NLA_U32 },
[NL80211_ATTR_DTIM_PERIOD] = { .type = NLA_U32 },
[NL80211_ATTR_BEACON_HEAD] = { .type = NLA_BINARY,
.len = IEEE80211_MAX_DATA_LEN },
[NL80211_ATTR_BEACON_TAIL] = { .type = NLA_BINARY,
.len = IEEE80211_MAX_DATA_LEN },
[NL80211_ATTR_STA_AID] = { .type = NLA_U16 },
[NL80211_ATTR_STA_FLAGS] = { .type = NLA_NESTED },
[NL80211_ATTR_STA_LISTEN_INTERVAL] = { .type = NLA_U16 },
[NL80211_ATTR_STA_SUPPORTED_RATES] = { .type = NLA_BINARY,
.len = NL80211_MAX_SUPP_RATES },
[NL80211_ATTR_STA_PLINK_ACTION] = { .type = NLA_U8 },
[NL80211_ATTR_STA_VLAN] = { .type = NLA_U32 },
[NL80211_ATTR_MNTR_FLAGS] = { /* NLA_NESTED can't be empty */ },
[NL80211_ATTR_MESH_ID] = { .type = NLA_BINARY,
.len = IEEE80211_MAX_MESH_ID_LEN },
[NL80211_ATTR_MPATH_NEXT_HOP] = { .type = NLA_U32 },
[NL80211_ATTR_REG_ALPHA2] = { .type = NLA_STRING, .len = 2 },
[NL80211_ATTR_REG_RULES] = { .type = NLA_NESTED },
[NL80211_ATTR_BSS_CTS_PROT] = { .type = NLA_U8 },
[NL80211_ATTR_BSS_SHORT_PREAMBLE] = { .type = NLA_U8 },
[NL80211_ATTR_BSS_SHORT_SLOT_TIME] = { .type = NLA_U8 },
[NL80211_ATTR_BSS_BASIC_RATES] = { .type = NLA_BINARY,
.len = NL80211_MAX_SUPP_RATES },
[NL80211_ATTR_MESH_PARAMS] = { .type = NLA_NESTED },
[NL80211_ATTR_HT_CAPABILITY] = { .type = NLA_BINARY,
.len = NL80211_HT_CAPABILITY_LEN },
[NL80211_ATTR_MGMT_SUBTYPE] = { .type = NLA_U8 },
[NL80211_ATTR_IE] = { .type = NLA_BINARY,
.len = IEEE80211_MAX_DATA_LEN },
[NL80211_ATTR_SCAN_FREQUENCIES] = { .type = NLA_NESTED },
[NL80211_ATTR_SCAN_SSIDS] = { .type = NLA_NESTED },
[NL80211_ATTR_SSID] = { .type = NLA_BINARY,
.len = IEEE80211_MAX_SSID_LEN },
[NL80211_ATTR_AUTH_TYPE] = { .type = NLA_U32 },
[NL80211_ATTR_REASON_CODE] = { .type = NLA_U16 },
[NL80211_ATTR_FREQ_FIXED] = { .type = NLA_FLAG },
[NL80211_ATTR_TIMED_OUT] = { .type = NLA_FLAG },
[NL80211_ATTR_USE_MFP] = { .type = NLA_U32 },
[NL80211_ATTR_STA_FLAGS2] = {
.len = sizeof(struct nl80211_sta_flag_update),
},
[NL80211_ATTR_CONTROL_PORT] = { .type = NLA_FLAG },
[NL80211_ATTR_PRIVACY] = { .type = NLA_FLAG },
[NL80211_ATTR_CIPHER_SUITE_GROUP] = { .type = NLA_U32 },
[NL80211_ATTR_WPA_VERSIONS] = { .type = NLA_U32 },
[NL80211_ATTR_PID] = { .type = NLA_U32 },
[NL80211_ATTR_4ADDR] = { .type = NLA_U8 },
[NL80211_ATTR_PMKID] = { .type = NLA_BINARY,
.len = WLAN_PMKID_LEN },
[NL80211_ATTR_DURATION] = { .type = NLA_U32 },
[NL80211_ATTR_COOKIE] = { .type = NLA_U64 },
[NL80211_ATTR_TX_RATES] = { .type = NLA_NESTED },
[NL80211_ATTR_FRAME] = { .type = NLA_BINARY,
.len = IEEE80211_MAX_DATA_LEN },
[NL80211_ATTR_FRAME_MATCH] = { .type = NLA_BINARY, },
[NL80211_ATTR_PS_STATE] = { .type = NLA_U32 },
[NL80211_ATTR_CQM] = { .type = NLA_NESTED, },
[NL80211_ATTR_LOCAL_STATE_CHANGE] = { .type = NLA_FLAG },
[NL80211_ATTR_AP_ISOLATE] = { .type = NLA_U8 },
};
/* policy for the attributes */
static const struct nla_policy nl80211_key_policy[NL80211_KEY_MAX + 1] = {
[NL80211_KEY_DATA] = { .type = NLA_BINARY, .len = WLAN_MAX_KEY_LEN },
[NL80211_KEY_IDX] = { .type = NLA_U8 },
[NL80211_KEY_CIPHER] = { .type = NLA_U32 },
[NL80211_KEY_SEQ] = { .type = NLA_BINARY, .len = 8 },
[NL80211_KEY_DEFAULT] = { .type = NLA_FLAG },
[NL80211_KEY_DEFAULT_MGMT] = { .type = NLA_FLAG },
};
/* ifidx get helper */
static int nl80211_get_ifidx(struct netlink_callback *cb)
{
int res;
res = nlmsg_parse(cb->nlh, GENL_HDRLEN + nl80211_fam.hdrsize,
nl80211_fam.attrbuf, nl80211_fam.maxattr,
nl80211_policy);
if (res)
return res;
if (!nl80211_fam.attrbuf[NL80211_ATTR_IFINDEX])
return -EINVAL;
res = nla_get_u32(nl80211_fam.attrbuf[NL80211_ATTR_IFINDEX]);
if (!res)
return -EINVAL;
return res;
}
/* IE validation */
static bool is_valid_ie_attr(const struct nlattr *attr)
{
const u8 *pos;
int len;
if (!attr)
return true;
pos = nla_data(attr);
len = nla_len(attr);
while (len) {
u8 elemlen;
if (len < 2)
return false;
len -= 2;
elemlen = pos[1];
if (elemlen > len)
return false;
len -= elemlen;
pos += 2 + elemlen;
}
return true;
}
/* message building helper */
static inline void *nl80211hdr_put(struct sk_buff *skb, u32 pid, u32 seq,
int flags, u8 cmd)
{
/* since there is no private header just add the generic one */
return genlmsg_put(skb, pid, seq, &nl80211_fam, flags, cmd);
}
static int nl80211_msg_put_channel(struct sk_buff *msg,
struct ieee80211_channel *chan)
{
NLA_PUT_U32(msg, NL80211_FREQUENCY_ATTR_FREQ,
chan->center_freq);
if (chan->flags & IEEE80211_CHAN_DISABLED)
NLA_PUT_FLAG(msg, NL80211_FREQUENCY_ATTR_DISABLED);
if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN)
NLA_PUT_FLAG(msg, NL80211_FREQUENCY_ATTR_PASSIVE_SCAN);
if (chan->flags & IEEE80211_CHAN_NO_IBSS)
NLA_PUT_FLAG(msg, NL80211_FREQUENCY_ATTR_NO_IBSS);
if (chan->flags & IEEE80211_CHAN_RADAR)
NLA_PUT_FLAG(msg, NL80211_FREQUENCY_ATTR_RADAR);
NLA_PUT_U32(msg, NL80211_FREQUENCY_ATTR_MAX_TX_POWER,
DBM_TO_MBM(chan->max_power));
return 0;
nla_put_failure:
return -ENOBUFS;
}
/* netlink command implementations */
struct key_parse {
struct key_params p;
int idx;
bool def, defmgmt;
};
static int nl80211_parse_key_new(struct nlattr *key, struct key_parse *k)
{
struct nlattr *tb[NL80211_KEY_MAX + 1];
int err = nla_parse_nested(tb, NL80211_KEY_MAX, key,
nl80211_key_policy);
if (err)
return err;
k->def = !!tb[NL80211_KEY_DEFAULT];
k->defmgmt = !!tb[NL80211_KEY_DEFAULT_MGMT];
if (tb[NL80211_KEY_IDX])
k->idx = nla_get_u8(tb[NL80211_KEY_IDX]);
if (tb[NL80211_KEY_DATA]) {
k->p.key = nla_data(tb[NL80211_KEY_DATA]);
k->p.key_len = nla_len(tb[NL80211_KEY_DATA]);
}
if (tb[NL80211_KEY_SEQ]) {
k->p.seq = nla_data(tb[NL80211_KEY_SEQ]);
k->p.seq_len = nla_len(tb[NL80211_KEY_SEQ]);
}
if (tb[NL80211_KEY_CIPHER])
k->p.cipher = nla_get_u32(tb[NL80211_KEY_CIPHER]);
return 0;
}
static int nl80211_parse_key_old(struct genl_info *info, struct key_parse *k)
{
if (info->attrs[NL80211_ATTR_KEY_DATA]) {
k->p.key = nla_data(info->attrs[NL80211_ATTR_KEY_DATA]);
k->p.key_len = nla_len(info->attrs[NL80211_ATTR_KEY_DATA]);
}
if (info->attrs[NL80211_ATTR_KEY_SEQ]) {
k->p.seq = nla_data(info->attrs[NL80211_ATTR_KEY_SEQ]);
k->p.seq_len = nla_len(info->attrs[NL80211_ATTR_KEY_SEQ]);
}
if (info->attrs[NL80211_ATTR_KEY_IDX])
k->idx = nla_get_u8(info->attrs[NL80211_ATTR_KEY_IDX]);
if (info->attrs[NL80211_ATTR_KEY_CIPHER])
k->p.cipher = nla_get_u32(info->attrs[NL80211_ATTR_KEY_CIPHER]);
k->def = !!info->attrs[NL80211_ATTR_KEY_DEFAULT];
k->defmgmt = !!info->attrs[NL80211_ATTR_KEY_DEFAULT_MGMT];
return 0;
}
static int nl80211_parse_key(struct genl_info *info, struct key_parse *k)
{
int err;
memset(k, 0, sizeof(*k));
k->idx = -1;
if (info->attrs[NL80211_ATTR_KEY])
err = nl80211_parse_key_new(info->attrs[NL80211_ATTR_KEY], k);
else
err = nl80211_parse_key_old(info, k);
if (err)
return err;
if (k->def && k->defmgmt)
return -EINVAL;
if (k->idx != -1) {
if (k->defmgmt) {
if (k->idx < 4 || k->idx > 5)
return -EINVAL;
} else if (k->def) {
if (k->idx < 0 || k->idx > 3)
return -EINVAL;
} else {
if (k->idx < 0 || k->idx > 5)
return -EINVAL;
}
}
return 0;
}
static struct cfg80211_cached_keys *
nl80211_parse_connkeys(struct cfg80211_registered_device *rdev,
struct nlattr *keys)
{
struct key_parse parse;
struct nlattr *key;
struct cfg80211_cached_keys *result;
int rem, err, def = 0;
result = kzalloc(sizeof(*result), GFP_KERNEL);
if (!result)
return ERR_PTR(-ENOMEM);
result->def = -1;
result->defmgmt = -1;
nla_for_each_nested(key, keys, rem) {
memset(&parse, 0, sizeof(parse));
parse.idx = -1;
err = nl80211_parse_key_new(key, &parse);
if (err)
goto error;
err = -EINVAL;
if (!parse.p.key)
goto error;
if (parse.idx < 0 || parse.idx > 4)
goto error;
if (parse.def) {
if (def)
goto error;
def = 1;
result->def = parse.idx;
} else if (parse.defmgmt)
goto error;
err = cfg80211_validate_key_settings(rdev, &parse.p,
parse.idx, NULL);
if (err)
goto error;
result->params[parse.idx].cipher = parse.p.cipher;
result->params[parse.idx].key_len = parse.p.key_len;
result->params[parse.idx].key = result->data[parse.idx];
memcpy(result->data[parse.idx], parse.p.key, parse.p.key_len);
}
return result;
error:
kfree(result);
return ERR_PTR(err);
}
static int nl80211_key_allowed(struct wireless_dev *wdev)
{
ASSERT_WDEV_LOCK(wdev);
if (!netif_running(wdev->netdev))
return -ENETDOWN;
switch (wdev->iftype) {
case NL80211_IFTYPE_AP:
case NL80211_IFTYPE_AP_VLAN:
break;
case NL80211_IFTYPE_ADHOC:
if (!wdev->current_bss)
return -ENOLINK;
break;
case NL80211_IFTYPE_STATION:
if (wdev->sme_state != CFG80211_SME_CONNECTED)
return -ENOLINK;
break;
default:
return -EINVAL;
}
return 0;
}
static int nl80211_send_wiphy(struct sk_buff *msg, u32 pid, u32 seq, int flags,
struct cfg80211_registered_device *dev)
{
void *hdr;
struct nlattr *nl_bands, *nl_band;
struct nlattr *nl_freqs, *nl_freq;
struct nlattr *nl_rates, *nl_rate;
struct nlattr *nl_modes;
struct nlattr *nl_cmds;
enum ieee80211_band band;
struct ieee80211_channel *chan;
struct ieee80211_rate *rate;
int i;
u16 ifmodes = dev->wiphy.interface_modes;
hdr = nl80211hdr_put(msg, pid, seq, flags, NL80211_CMD_NEW_WIPHY);
if (!hdr)
return -1;
NLA_PUT_U32(msg, NL80211_ATTR_WIPHY, dev->wiphy_idx);
NLA_PUT_STRING(msg, NL80211_ATTR_WIPHY_NAME, wiphy_name(&dev->wiphy));
NLA_PUT_U32(msg, NL80211_ATTR_GENERATION,
cfg80211_rdev_list_generation);
NLA_PUT_U8(msg, NL80211_ATTR_WIPHY_RETRY_SHORT,
dev->wiphy.retry_short);
NLA_PUT_U8(msg, NL80211_ATTR_WIPHY_RETRY_LONG,
dev->wiphy.retry_long);
NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_FRAG_THRESHOLD,
dev->wiphy.frag_threshold);
NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_RTS_THRESHOLD,
dev->wiphy.rts_threshold);
NLA_PUT_U8(msg, NL80211_ATTR_WIPHY_COVERAGE_CLASS,
dev->wiphy.coverage_class);
NLA_PUT_U8(msg, NL80211_ATTR_MAX_NUM_SCAN_SSIDS,
dev->wiphy.max_scan_ssids);
NLA_PUT_U16(msg, NL80211_ATTR_MAX_SCAN_IE_LEN,
dev->wiphy.max_scan_ie_len);
NLA_PUT(msg, NL80211_ATTR_CIPHER_SUITES,
sizeof(u32) * dev->wiphy.n_cipher_suites,
dev->wiphy.cipher_suites);
NLA_PUT_U8(msg, NL80211_ATTR_MAX_NUM_PMKIDS,
dev->wiphy.max_num_pmkids);
nl_modes = nla_nest_start(msg, NL80211_ATTR_SUPPORTED_IFTYPES);
if (!nl_modes)
goto nla_put_failure;
i = 0;
while (ifmodes) {
if (ifmodes & 1)
NLA_PUT_FLAG(msg, i);
ifmodes >>= 1;
i++;
}
nla_nest_end(msg, nl_modes);
nl_bands = nla_nest_start(msg, NL80211_ATTR_WIPHY_BANDS);
if (!nl_bands)
goto nla_put_failure;
for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
if (!dev->wiphy.bands[band])
continue;
nl_band = nla_nest_start(msg, band);
if (!nl_band)
goto nla_put_failure;
/* add HT info */
if (dev->wiphy.bands[band]->ht_cap.ht_supported) {
NLA_PUT(msg, NL80211_BAND_ATTR_HT_MCS_SET,
sizeof(dev->wiphy.bands[band]->ht_cap.mcs),
&dev->wiphy.bands[band]->ht_cap.mcs);
NLA_PUT_U16(msg, NL80211_BAND_ATTR_HT_CAPA,
dev->wiphy.bands[band]->ht_cap.cap);
NLA_PUT_U8(msg, NL80211_BAND_ATTR_HT_AMPDU_FACTOR,
dev->wiphy.bands[band]->ht_cap.ampdu_factor);
NLA_PUT_U8(msg, NL80211_BAND_ATTR_HT_AMPDU_DENSITY,
dev->wiphy.bands[band]->ht_cap.ampdu_density);
}
/* add frequencies */
nl_freqs = nla_nest_start(msg, NL80211_BAND_ATTR_FREQS);
if (!nl_freqs)
goto nla_put_failure;
for (i = 0; i < dev->wiphy.bands[band]->n_channels; i++) {
nl_freq = nla_nest_start(msg, i);
if (!nl_freq)
goto nla_put_failure;
chan = &dev->wiphy.bands[band]->channels[i];
if (nl80211_msg_put_channel(msg, chan))
goto nla_put_failure;
nla_nest_end(msg, nl_freq);
}
nla_nest_end(msg, nl_freqs);
/* add bitrates */
nl_rates = nla_nest_start(msg, NL80211_BAND_ATTR_RATES);
if (!nl_rates)
goto nla_put_failure;
for (i = 0; i < dev->wiphy.bands[band]->n_bitrates; i++) {
nl_rate = nla_nest_start(msg, i);
if (!nl_rate)
goto nla_put_failure;
rate = &dev->wiphy.bands[band]->bitrates[i];
NLA_PUT_U32(msg, NL80211_BITRATE_ATTR_RATE,
rate->bitrate);
if (rate->flags & IEEE80211_RATE_SHORT_PREAMBLE)
NLA_PUT_FLAG(msg,
NL80211_BITRATE_ATTR_2GHZ_SHORTPREAMBLE);
nla_nest_end(msg, nl_rate);
}
nla_nest_end(msg, nl_rates);
nla_nest_end(msg, nl_band);
}
nla_nest_end(msg, nl_bands);
nl_cmds = nla_nest_start(msg, NL80211_ATTR_SUPPORTED_COMMANDS);
if (!nl_cmds)
goto nla_put_failure;
i = 0;
#define CMD(op, n) \
do { \
if (dev->ops->op) { \
i++; \
NLA_PUT_U32(msg, i, NL80211_CMD_ ## n); \
} \
} while (0)
CMD(add_virtual_intf, NEW_INTERFACE);
CMD(change_virtual_intf, SET_INTERFACE);
CMD(add_key, NEW_KEY);
CMD(add_beacon, NEW_BEACON);
CMD(add_station, NEW_STATION);
CMD(add_mpath, NEW_MPATH);
CMD(set_mesh_params, SET_MESH_PARAMS);
CMD(change_bss, SET_BSS);
CMD(auth, AUTHENTICATE);
CMD(assoc, ASSOCIATE);
CMD(deauth, DEAUTHENTICATE);
CMD(disassoc, DISASSOCIATE);
CMD(join_ibss, JOIN_IBSS);
CMD(set_pmksa, SET_PMKSA);
CMD(del_pmksa, DEL_PMKSA);
CMD(flush_pmksa, FLUSH_PMKSA);
CMD(remain_on_channel, REMAIN_ON_CHANNEL);
CMD(set_bitrate_mask, SET_TX_BITRATE_MASK);
CMD(action, ACTION);
if (dev->wiphy.flags & WIPHY_FLAG_NETNS_OK) {
i++;
NLA_PUT_U32(msg, i, NL80211_CMD_SET_WIPHY_NETNS);
}
CMD(set_channel, SET_CHANNEL);
#undef CMD
if (dev->ops->connect || dev->ops->auth) {
i++;
NLA_PUT_U32(msg, i, NL80211_CMD_CONNECT);
}
if (dev->ops->disconnect || dev->ops->deauth) {
i++;
NLA_PUT_U32(msg, i, NL80211_CMD_DISCONNECT);
}
nla_nest_end(msg, nl_cmds);
return genlmsg_end(msg, hdr);
nla_put_failure:
genlmsg_cancel(msg, hdr);
return -EMSGSIZE;
}
static int nl80211_dump_wiphy(struct sk_buff *skb, struct netlink_callback *cb)
{
int idx = 0;
int start = cb->args[0];
struct cfg80211_registered_device *dev;
mutex_lock(&cfg80211_mutex);
list_for_each_entry(dev, &cfg80211_rdev_list, list) {
if (!net_eq(wiphy_net(&dev->wiphy), sock_net(skb->sk)))
continue;
if (++idx <= start)
continue;
if (nl80211_send_wiphy(skb, NETLINK_CB(cb->skb).pid,
cb->nlh->nlmsg_seq, NLM_F_MULTI,
dev) < 0) {
idx--;
break;
}
}
mutex_unlock(&cfg80211_mutex);
cb->args[0] = idx;
return skb->len;
}
static int nl80211_get_wiphy(struct sk_buff *skb, struct genl_info *info)
{
struct sk_buff *msg;
struct cfg80211_registered_device *dev;
dev = cfg80211_get_dev_from_info(info);
if (IS_ERR(dev))
return PTR_ERR(dev);
msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!msg)
goto out_err;
if (nl80211_send_wiphy(msg, info->snd_pid, info->snd_seq, 0, dev) < 0)
goto out_free;
cfg80211_unlock_rdev(dev);
return genlmsg_reply(msg, info);
out_free:
nlmsg_free(msg);
out_err:
cfg80211_unlock_rdev(dev);
return -ENOBUFS;
}
static const struct nla_policy txq_params_policy[NL80211_TXQ_ATTR_MAX + 1] = {
[NL80211_TXQ_ATTR_QUEUE] = { .type = NLA_U8 },
[NL80211_TXQ_ATTR_TXOP] = { .type = NLA_U16 },
[NL80211_TXQ_ATTR_CWMIN] = { .type = NLA_U16 },
[NL80211_TXQ_ATTR_CWMAX] = { .type = NLA_U16 },
[NL80211_TXQ_ATTR_AIFS] = { .type = NLA_U8 },
};
static int parse_txq_params(struct nlattr *tb[],
struct ieee80211_txq_params *txq_params)
{
if (!tb[NL80211_TXQ_ATTR_QUEUE] || !tb[NL80211_TXQ_ATTR_TXOP] ||
!tb[NL80211_TXQ_ATTR_CWMIN] || !tb[NL80211_TXQ_ATTR_CWMAX] ||
!tb[NL80211_TXQ_ATTR_AIFS])
return -EINVAL;
txq_params->queue = nla_get_u8(tb[NL80211_TXQ_ATTR_QUEUE]);
txq_params->txop = nla_get_u16(tb[NL80211_TXQ_ATTR_TXOP]);
txq_params->cwmin = nla_get_u16(tb[NL80211_TXQ_ATTR_CWMIN]);
txq_params->cwmax = nla_get_u16(tb[NL80211_TXQ_ATTR_CWMAX]);
txq_params->aifs = nla_get_u8(tb[NL80211_TXQ_ATTR_AIFS]);
return 0;
}
static bool nl80211_can_set_dev_channel(struct wireless_dev *wdev)
{
/*
* You can only set the channel explicitly for AP, mesh
* and WDS type interfaces; all others have their channel
* managed via their respective "establish a connection"
* command (connect, join, ...)
*
* Monitors are special as they are normally slaved to
* whatever else is going on, so they behave as though
* you tried setting the wiphy channel itself.
*/
return !wdev ||
wdev->iftype == NL80211_IFTYPE_AP ||
wdev->iftype == NL80211_IFTYPE_WDS ||
wdev->iftype == NL80211_IFTYPE_MESH_POINT ||
wdev->iftype == NL80211_IFTYPE_MONITOR;
}
static int __nl80211_set_channel(struct cfg80211_registered_device *rdev,
struct wireless_dev *wdev,
struct genl_info *info)
{
enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
u32 freq;
int result;
if (!info->attrs[NL80211_ATTR_WIPHY_FREQ])
return -EINVAL;
if (!nl80211_can_set_dev_channel(wdev))
return -EOPNOTSUPP;
if (info->attrs[NL80211_ATTR_WIPHY_CHANNEL_TYPE]) {
channel_type = nla_get_u32(info->attrs[
NL80211_ATTR_WIPHY_CHANNEL_TYPE]);
if (channel_type != NL80211_CHAN_NO_HT &&
channel_type != NL80211_CHAN_HT20 &&
channel_type != NL80211_CHAN_HT40PLUS &&
channel_type != NL80211_CHAN_HT40MINUS)
return -EINVAL;
}
freq = nla_get_u32(info->attrs[NL80211_ATTR_WIPHY_FREQ]);
mutex_lock(&rdev->devlist_mtx);
if (wdev) {
wdev_lock(wdev);
result = cfg80211_set_freq(rdev, wdev, freq, channel_type);
wdev_unlock(wdev);
} else {
result = cfg80211_set_freq(rdev, NULL, freq, channel_type);
}
mutex_unlock(&rdev->devlist_mtx);
return result;
}
static int nl80211_set_channel(struct sk_buff *skb, struct genl_info *info)
{
struct cfg80211_registered_device *rdev;
struct net_device *netdev;
int result;
rtnl_lock();
result = get_rdev_dev_by_info_ifindex(info, &rdev, &netdev);
if (result)
goto unlock_rtnl;
result = __nl80211_set_channel(rdev, netdev->ieee80211_ptr, info);
dev_put(netdev);
cfg80211_unlock_rdev(rdev);
unlock_rtnl:
rtnl_unlock();
return result;
}
static int nl80211_set_wiphy(struct sk_buff *skb, struct genl_info *info)
{
struct cfg80211_registered_device *rdev;
struct net_device *netdev = NULL;
struct wireless_dev *wdev;
int result, rem_txq_params = 0;
struct nlattr *nl_txq_params;
u32 changed;
u8 retry_short = 0, retry_long = 0;
u32 frag_threshold = 0, rts_threshold = 0;
u8 coverage_class = 0;
rtnl_lock();
/*
* Try to find the wiphy and netdev. Normally this
* function shouldn't need the netdev, but this is
* done for backward compatibility -- previously
* setting the channel was done per wiphy, but now
* it is per netdev. Previous userland like hostapd
* also passed a netdev to set_wiphy, so that it is
* possible to let that go to the right netdev!
*/
mutex_lock(&cfg80211_mutex);
if (info->attrs[NL80211_ATTR_IFINDEX]) {
int ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);
netdev = dev_get_by_index(genl_info_net(info), ifindex);
if (netdev && netdev->ieee80211_ptr) {
rdev = wiphy_to_dev(netdev->ieee80211_ptr->wiphy);
mutex_lock(&rdev->mtx);
} else
netdev = NULL;
}
if (!netdev) {
rdev = __cfg80211_rdev_from_info(info);
if (IS_ERR(rdev)) {
mutex_unlock(&cfg80211_mutex);
result = PTR_ERR(rdev);
goto unlock;
}
wdev = NULL;
netdev = NULL;
result = 0;
mutex_lock(&rdev->mtx);
} else if (netif_running(netdev) &&
nl80211_can_set_dev_channel(netdev->ieee80211_ptr))
wdev = netdev->ieee80211_ptr;
else
wdev = NULL;
/*
* end workaround code, by now the rdev is available
* and locked, and wdev may or may not be NULL.
*/
if (info->attrs[NL80211_ATTR_WIPHY_NAME])
result = cfg80211_dev_rename(
rdev, nla_data(info->attrs[NL80211_ATTR_WIPHY_NAME]));
mutex_unlock(&cfg80211_mutex);
if (result)
goto bad_res;
if (info->attrs[NL80211_ATTR_WIPHY_TXQ_PARAMS]) {
struct ieee80211_txq_params txq_params;
struct nlattr *tb[NL80211_TXQ_ATTR_MAX + 1];
if (!rdev->ops->set_txq_params) {
result = -EOPNOTSUPP;
goto bad_res;
}
nla_for_each_nested(nl_txq_params,
info->attrs[NL80211_ATTR_WIPHY_TXQ_PARAMS],
rem_txq_params) {
nla_parse(tb, NL80211_TXQ_ATTR_MAX,
nla_data(nl_txq_params),
nla_len(nl_txq_params),
txq_params_policy);
result = parse_txq_params(tb, &txq_params);
if (result)
goto bad_res;
result = rdev->ops->set_txq_params(&rdev->wiphy,
&txq_params);
if (result)
goto bad_res;
}
}
if (info->attrs[NL80211_ATTR_WIPHY_FREQ]) {
result = __nl80211_set_channel(rdev, wdev, info);
if (result)
goto bad_res;
}
changed = 0;
if (info->attrs[NL80211_ATTR_WIPHY_RETRY_SHORT]) {
retry_short = nla_get_u8(
info->attrs[NL80211_ATTR_WIPHY_RETRY_SHORT]);
if (retry_short == 0) {
result = -EINVAL;
goto bad_res;
}
changed |= WIPHY_PARAM_RETRY_SHORT;
}
if (info->attrs[NL80211_ATTR_WIPHY_RETRY_LONG]) {
retry_long = nla_get_u8(
info->attrs[NL80211_ATTR_WIPHY_RETRY_LONG]);
if (retry_long == 0) {
result = -EINVAL;
goto bad_res;
}
changed |= WIPHY_PARAM_RETRY_LONG;
}
if (info->attrs[NL80211_ATTR_WIPHY_FRAG_THRESHOLD]) {
frag_threshold = nla_get_u32(
info->attrs[NL80211_ATTR_WIPHY_FRAG_THRESHOLD]);
if (frag_threshold < 256) {
result = -EINVAL;
goto bad_res;
}
if (frag_threshold != (u32) -1) {
/*
* Fragments (apart from the last one) are required to
* have even length. Make the fragmentation code
* simpler by stripping LSB should someone try to use
* odd threshold value.
*/
frag_threshold &= ~0x1;
}
changed |= WIPHY_PARAM_FRAG_THRESHOLD;
}
if (info->attrs[NL80211_ATTR_WIPHY_RTS_THRESHOLD]) {
rts_threshold = nla_get_u32(
info->attrs[NL80211_ATTR_WIPHY_RTS_THRESHOLD]);
changed |= WIPHY_PARAM_RTS_THRESHOLD;
}
if (info->attrs[NL80211_ATTR_WIPHY_COVERAGE_CLASS]) {
coverage_class = nla_get_u8(
info->attrs[NL80211_ATTR_WIPHY_COVERAGE_CLASS]);
changed |= WIPHY_PARAM_COVERAGE_CLASS;
}
if (changed) {
u8 old_retry_short, old_retry_long;
u32 old_frag_threshold, old_rts_threshold;
u8 old_coverage_class;
if (!rdev->ops->set_wiphy_params) {
result = -EOPNOTSUPP;
goto bad_res;
}
old_retry_short = rdev->wiphy.retry_short;
old_retry_long = rdev->wiphy.retry_long;
old_frag_threshold = rdev->wiphy.frag_threshold;
old_rts_threshold = rdev->wiphy.rts_threshold;
old_coverage_class = rdev->wiphy.coverage_class;
if (changed & WIPHY_PARAM_RETRY_SHORT)
rdev->wiphy.retry_short = retry_short;
if (changed & WIPHY_PARAM_RETRY_LONG)
rdev->wiphy.retry_long = retry_long;
if (changed & WIPHY_PARAM_FRAG_THRESHOLD)
rdev->wiphy.frag_threshold = frag_threshold;
if (changed & WIPHY_PARAM_RTS_THRESHOLD)
rdev->wiphy.rts_threshold = rts_threshold;
if (changed & WIPHY_PARAM_COVERAGE_CLASS)
rdev->wiphy.coverage_class = coverage_class;
result = rdev->ops->set_wiphy_params(&rdev->wiphy, changed);
if (result) {
rdev->wiphy.retry_short = old_retry_short;
rdev->wiphy.retry_long = old_retry_long;
rdev->wiphy.frag_threshold = old_frag_threshold;
rdev->wiphy.rts_threshold = old_rts_threshold;
rdev->wiphy.coverage_class = old_coverage_class;
}
}
bad_res:
mutex_unlock(&rdev->mtx);
if (netdev)
dev_put(netdev);
unlock:
rtnl_unlock();
return result;
}
static int nl80211_send_iface(struct sk_buff *msg, u32 pid, u32 seq, int flags,
struct cfg80211_registered_device *rdev,
struct net_device *dev)
{
void *hdr;
hdr = nl80211hdr_put(msg, pid, seq, flags, NL80211_CMD_NEW_INTERFACE);
if (!hdr)
return -1;
NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, dev->ifindex);
NLA_PUT_U32(msg, NL80211_ATTR_WIPHY, rdev->wiphy_idx);
NLA_PUT_STRING(msg, NL80211_ATTR_IFNAME, dev->name);
NLA_PUT_U32(msg, NL80211_ATTR_IFTYPE, dev->ieee80211_ptr->iftype);
NLA_PUT_U32(msg, NL80211_ATTR_GENERATION,
rdev->devlist_generation ^
(cfg80211_rdev_list_generation << 2));
return genlmsg_end(msg, hdr);
nla_put_failure:
genlmsg_cancel(msg, hdr);
return -EMSGSIZE;
}
static int nl80211_dump_interface(struct sk_buff *skb, struct netlink_callback *cb)