diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2008-04-18 18:02:35 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-04-18 18:02:35 -0700 |
commit | 334d094504c2fe1c44211ecb49146ae6bca8c321 (patch) | |
tree | d3c0f68e4b9f8e3d2ccc39e7dfe5de0534a5fad9 /net/wireless/reg.c | |
parent | d1a4be630fb068f251d64b62919f143c49ca8057 (diff) | |
parent | d1643d24c61b725bef399cc1cf2944b4c9c23177 (diff) |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6.26
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6.26: (1090 commits)
[NET]: Fix and allocate less memory for ->priv'less netdevices
[IPV6]: Fix dangling references on error in fib6_add().
[NETLABEL]: Fix NULL deref in netlbl_unlabel_staticlist_gen() if ifindex not found
[PKT_SCHED]: Fix datalen check in tcf_simp_init().
[INET]: Uninline the __inet_inherit_port call.
[INET]: Drop the inet_inherit_port() call.
SCTP: Initialize partial_bytes_acked to 0, when all of the data is acked.
[netdrvr] forcedeth: internal simplifications; changelog removal
phylib: factor out get_phy_id from within get_phy_device
PHY: add BCM5464 support to broadcom PHY driver
cxgb3: Fix __must_check warning with dev_dbg.
tc35815: Statistics cleanup
natsemi: fix MMIO for PPC 44x platforms
[TIPC]: Cleanup of TIPC reference table code
[TIPC]: Optimized initialization of TIPC reference table
[TIPC]: Remove inlining of reference table locking routines
e1000: convert uint16_t style integers to u16
ixgb: convert uint16_t style integers to u16
sb1000.c: make const arrays static
sb1000.c: stop inlining largish static functions
...
Diffstat (limited to 'net/wireless/reg.c')
-rw-r--r-- | net/wireless/reg.c | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/net/wireless/reg.c b/net/wireless/reg.c new file mode 100644 index 00000000000..185488da246 --- /dev/null +++ b/net/wireless/reg.c @@ -0,0 +1,162 @@ +/* + * Copyright 2002-2005, Instant802 Networks, Inc. + * Copyright 2005-2006, Devicescape Software, Inc. + * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +/* + * This regulatory domain control implementation is highly incomplete, it + * only exists for the purpose of not regressing mac80211. + * + * For now, drivers can restrict the set of allowed channels by either + * not registering those channels or setting the IEEE80211_CHAN_DISABLED + * flag; that flag will only be *set* by this code, never *cleared. + * + * The usual implementation is for a driver to read a device EEPROM to + * determine which regulatory domain it should be operating under, then + * looking up the allowable channels in a driver-local table and finally + * registering those channels in the wiphy structure. + * + * Alternatively, drivers that trust the regulatory domain control here + * will register a complete set of capabilities and the control code + * will restrict the set by setting the IEEE80211_CHAN_* flags. + */ +#include <linux/kernel.h> +#include <net/wireless.h> +#include "core.h" + +static char *ieee80211_regdom = "US"; +module_param(ieee80211_regdom, charp, 0444); +MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code"); + +struct ieee80211_channel_range { + short start_freq; + short end_freq; + int max_power; + int max_antenna_gain; + u32 flags; +}; + +struct ieee80211_regdomain { + const char *code; + const struct ieee80211_channel_range *ranges; + int n_ranges; +}; + +#define RANGE_PWR(_start, _end, _pwr, _ag, _flags) \ + { _start, _end, _pwr, _ag, _flags } + + +/* + * Ideally, in the future, these definitions will be loaded from a + * userspace table via some daemon. + */ +static const struct ieee80211_channel_range ieee80211_US_channels[] = { + /* IEEE 802.11b/g, channels 1..11 */ + RANGE_PWR(2412, 2462, 27, 6, 0), + /* IEEE 802.11a, channel 36*/ + RANGE_PWR(5180, 5180, 23, 6, 0), + /* IEEE 802.11a, channel 40*/ + RANGE_PWR(5200, 5200, 23, 6, 0), + /* IEEE 802.11a, channel 44*/ + RANGE_PWR(5220, 5220, 23, 6, 0), + /* IEEE 802.11a, channels 48..64 */ + RANGE_PWR(5240, 5320, 23, 6, 0), + /* IEEE 802.11a, channels 149..165, outdoor */ + RANGE_PWR(5745, 5825, 30, 6, 0), +}; + +static const struct ieee80211_channel_range ieee80211_JP_channels[] = { + /* IEEE 802.11b/g, channels 1..14 */ + RANGE_PWR(2412, 2484, 20, 6, 0), + /* IEEE 802.11a, channels 34..48 */ + RANGE_PWR(5170, 5240, 20, 6, IEEE80211_CHAN_PASSIVE_SCAN), + /* IEEE 802.11a, channels 52..64 */ + RANGE_PWR(5260, 5320, 20, 6, IEEE80211_CHAN_NO_IBSS | + IEEE80211_CHAN_RADAR), +}; + +#define REGDOM(_code) \ + { \ + .code = __stringify(_code), \ + .ranges = ieee80211_ ##_code## _channels, \ + .n_ranges = ARRAY_SIZE(ieee80211_ ##_code## _channels), \ + } + +static const struct ieee80211_regdomain ieee80211_regdoms[] = { + REGDOM(US), + REGDOM(JP), +}; + + +static const struct ieee80211_regdomain *get_regdom(void) +{ + static const struct ieee80211_channel_range + ieee80211_world_channels[] = { + /* IEEE 802.11b/g, channels 1..11 */ + RANGE_PWR(2412, 2462, 27, 6, 0), + }; + static const struct ieee80211_regdomain regdom_world = REGDOM(world); + int i; + + for (i = 0; i < ARRAY_SIZE(ieee80211_regdoms); i++) + if (strcmp(ieee80211_regdom, ieee80211_regdoms[i].code) == 0) + return &ieee80211_regdoms[i]; + + return ®dom_world; +} + + +static void handle_channel(struct ieee80211_channel *chan, + const struct ieee80211_regdomain *rd) +{ + int i; + u32 flags = chan->orig_flags; + const struct ieee80211_channel_range *rg = NULL; + + for (i = 0; i < rd->n_ranges; i++) { + if (rd->ranges[i].start_freq <= chan->center_freq && + chan->center_freq <= rd->ranges[i].end_freq) { + rg = &rd->ranges[i]; + break; + } + } + + if (!rg) { + /* not found */ + flags |= IEEE80211_CHAN_DISABLED; + chan->flags = flags; + return; + } + + chan->flags = flags; + chan->max_antenna_gain = min(chan->orig_mag, + rg->max_antenna_gain); + if (chan->orig_mpwr) + chan->max_power = min(chan->orig_mpwr, rg->max_power); + else + chan->max_power = rg->max_power; +} + +static void handle_band(struct ieee80211_supported_band *sband, + const struct ieee80211_regdomain *rd) +{ + int i; + + for (i = 0; i < sband->n_channels; i++) + handle_channel(&sband->channels[i], rd); +} + +void wiphy_update_regulatory(struct wiphy *wiphy) +{ + enum ieee80211_band band; + const struct ieee80211_regdomain *rd = get_regdom(); + + for (band = 0; band < IEEE80211_NUM_BANDS; band++) + if (wiphy->bands[band]) + handle_band(wiphy->bands[band], rd); +} |