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authorLinus Torvalds <torvalds@linux-foundation.org>2012-12-12 18:07:07 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-12-12 18:07:07 -0800
commit6be35c700f742e911ecedd07fcc43d4439922334 (patch)
treeca9f37214d204465fcc2d79c82efd291e357c53c /net/mac80211/chan.c
parente37aa63e87bd581f9be5555ed0ba83f5295c92fc (diff)
parent520dfe3a3645257bf83660f672c47f8558f3d4c4 (diff)
downloadlwn-6be35c700f742e911ecedd07fcc43d4439922334.tar.gz
lwn-6be35c700f742e911ecedd07fcc43d4439922334.zip
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next
Pull networking changes from David Miller: 1) Allow to dump, monitor, and change the bridge multicast database using netlink. From Cong Wang. 2) RFC 5961 TCP blind data injection attack mitigation, from Eric Dumazet. 3) Networking user namespace support from Eric W. Biederman. 4) tuntap/virtio-net multiqueue support by Jason Wang. 5) Support for checksum offload of encapsulated packets (basically, tunneled traffic can still be checksummed by HW). From Joseph Gasparakis. 6) Allow BPF filter access to VLAN tags, from Eric Dumazet and Daniel Borkmann. 7) Bridge port parameters over netlink and BPDU blocking support from Stephen Hemminger. 8) Improve data access patterns during inet socket demux by rearranging socket layout, from Eric Dumazet. 9) TIPC protocol updates and cleanups from Ying Xue, Paul Gortmaker, and Jon Maloy. 10) Update TCP socket hash sizing to be more in line with current day realities. The existing heurstics were choosen a decade ago. From Eric Dumazet. 11) Fix races, queue bloat, and excessive wakeups in ATM and associated drivers, from Krzysztof Mazur and David Woodhouse. 12) Support DOVE (Distributed Overlay Virtual Ethernet) extensions in VXLAN driver, from David Stevens. 13) Add "oops_only" mode to netconsole, from Amerigo Wang. 14) Support set and query of VEB/VEPA bridge mode via PF_BRIDGE, also allow DCB netlink to work on namespaces other than the initial namespace. From John Fastabend. 15) Support PTP in the Tigon3 driver, from Matt Carlson. 16) tun/vhost zero copy fixes and improvements, plus turn it on by default, from Michael S. Tsirkin. 17) Support per-association statistics in SCTP, from Michele Baldessari. And many, many, driver updates, cleanups, and improvements. Too numerous to mention individually. * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (1722 commits) net/mlx4_en: Add support for destination MAC in steering rules net/mlx4_en: Use generic etherdevice.h functions. net: ethtool: Add destination MAC address to flow steering API bridge: add support of adding and deleting mdb entries bridge: notify mdb changes via netlink ndisc: Unexport ndisc_{build,send}_skb(). uapi: add missing netconf.h to export list pkt_sched: avoid requeues if possible solos-pci: fix double-free of TX skb in DMA mode bnx2: Fix accidental reversions. bna: Driver Version Updated to 3.1.2.1 bna: Firmware update bna: Add RX State bna: Rx Page Based Allocation bna: TX Intr Coalescing Fix bna: Tx and Rx Optimizations bna: Code Cleanup and Enhancements ath9k: check pdata variable before dereferencing it ath5k: RX timestamp is reported at end of frame ath9k_htc: RX timestamp is reported at end of frame ...
Diffstat (limited to 'net/mac80211/chan.c')
-rw-r--r--net/mac80211/chan.c411
1 files changed, 295 insertions, 116 deletions
diff --git a/net/mac80211/chan.c b/net/mac80211/chan.c
index 0bfc914ddd15..53f03120db55 100644
--- a/net/mac80211/chan.c
+++ b/net/mac80211/chan.c
@@ -3,168 +3,347 @@
*/
#include <linux/nl80211.h>
+#include <linux/export.h>
#include <net/cfg80211.h>
#include "ieee80211_i.h"
+#include "driver-ops.h"
-static enum ieee80211_chan_mode
-__ieee80211_get_channel_mode(struct ieee80211_local *local,
- struct ieee80211_sub_if_data *ignore)
+static void ieee80211_change_chandef(struct ieee80211_local *local,
+ struct ieee80211_chanctx *ctx,
+ const struct cfg80211_chan_def *chandef)
{
+ if (cfg80211_chandef_identical(&ctx->conf.def, chandef))
+ return;
+
+ WARN_ON(!cfg80211_chandef_compatible(&ctx->conf.def, chandef));
+
+ ctx->conf.def = *chandef;
+ drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_WIDTH);
+
+ if (!local->use_chanctx) {
+ local->_oper_channel_type = cfg80211_get_chandef_type(chandef);
+ ieee80211_hw_config(local, 0);
+ }
+}
+
+static struct ieee80211_chanctx *
+ieee80211_find_chanctx(struct ieee80211_local *local,
+ const struct cfg80211_chan_def *chandef,
+ enum ieee80211_chanctx_mode mode)
+{
+ struct ieee80211_chanctx *ctx;
+
+ lockdep_assert_held(&local->chanctx_mtx);
+
+ if (mode == IEEE80211_CHANCTX_EXCLUSIVE)
+ return NULL;
+
+ list_for_each_entry(ctx, &local->chanctx_list, list) {
+ const struct cfg80211_chan_def *compat;
+
+ if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
+ continue;
+
+ compat = cfg80211_chandef_compatible(&ctx->conf.def, chandef);
+ if (!compat)
+ continue;
+
+ ieee80211_change_chandef(local, ctx, compat);
+
+ return ctx;
+ }
+
+ return NULL;
+}
+
+static struct ieee80211_chanctx *
+ieee80211_new_chanctx(struct ieee80211_local *local,
+ const struct cfg80211_chan_def *chandef,
+ enum ieee80211_chanctx_mode mode)
+{
+ struct ieee80211_chanctx *ctx;
+ int err;
+
+ lockdep_assert_held(&local->chanctx_mtx);
+
+ ctx = kzalloc(sizeof(*ctx) + local->hw.chanctx_data_size, GFP_KERNEL);
+ if (!ctx)
+ return ERR_PTR(-ENOMEM);
+
+ ctx->conf.def = *chandef;
+ ctx->conf.rx_chains_static = 1;
+ ctx->conf.rx_chains_dynamic = 1;
+ ctx->mode = mode;
+
+ if (!local->use_chanctx) {
+ local->_oper_channel_type =
+ cfg80211_get_chandef_type(chandef);
+ local->_oper_channel = chandef->chan;
+ ieee80211_hw_config(local, 0);
+ } else {
+ err = drv_add_chanctx(local, ctx);
+ if (err) {
+ kfree(ctx);
+ return ERR_PTR(err);
+ }
+ }
+
+ list_add_rcu(&ctx->list, &local->chanctx_list);
+
+ return ctx;
+}
+
+static void ieee80211_free_chanctx(struct ieee80211_local *local,
+ struct ieee80211_chanctx *ctx)
+{
+ lockdep_assert_held(&local->chanctx_mtx);
+
+ WARN_ON_ONCE(ctx->refcount != 0);
+
+ if (!local->use_chanctx) {
+ local->_oper_channel_type = NL80211_CHAN_NO_HT;
+ ieee80211_hw_config(local, 0);
+ } else {
+ drv_remove_chanctx(local, ctx);
+ }
+
+ list_del_rcu(&ctx->list);
+ kfree_rcu(ctx, rcu_head);
+}
+
+static int ieee80211_assign_vif_chanctx(struct ieee80211_sub_if_data *sdata,
+ struct ieee80211_chanctx *ctx)
+{
+ struct ieee80211_local *local = sdata->local;
+ int ret;
+
+ lockdep_assert_held(&local->chanctx_mtx);
+
+ ret = drv_assign_vif_chanctx(local, sdata, ctx);
+ if (ret)
+ return ret;
+
+ rcu_assign_pointer(sdata->vif.chanctx_conf, &ctx->conf);
+ ctx->refcount++;
+
+ ieee80211_recalc_txpower(sdata);
+
+ return 0;
+}
+
+static void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local,
+ struct ieee80211_chanctx *ctx)
+{
+ struct ieee80211_chanctx_conf *conf = &ctx->conf;
struct ieee80211_sub_if_data *sdata;
+ const struct cfg80211_chan_def *compat = NULL;
- lockdep_assert_held(&local->iflist_mtx);
+ lockdep_assert_held(&local->chanctx_mtx);
- list_for_each_entry(sdata, &local->interfaces, list) {
- if (sdata == ignore)
+ rcu_read_lock();
+ list_for_each_entry_rcu(sdata, &local->interfaces, list) {
+
+ if (!ieee80211_sdata_running(sdata))
+ continue;
+ if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
continue;
+ if (!compat)
+ compat = &sdata->vif.bss_conf.chandef;
+
+ compat = cfg80211_chandef_compatible(
+ &sdata->vif.bss_conf.chandef, compat);
+ if (!compat)
+ break;
+ }
+ rcu_read_unlock();
+
+ if (WARN_ON_ONCE(!compat))
+ return;
+
+ ieee80211_change_chandef(local, ctx, compat);
+}
+
+static void ieee80211_unassign_vif_chanctx(struct ieee80211_sub_if_data *sdata,
+ struct ieee80211_chanctx *ctx)
+{
+ struct ieee80211_local *local = sdata->local;
+
+ lockdep_assert_held(&local->chanctx_mtx);
+
+ ctx->refcount--;
+ rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
+
+ drv_unassign_vif_chanctx(local, sdata, ctx);
+
+ if (ctx->refcount > 0) {
+ ieee80211_recalc_chanctx_chantype(sdata->local, ctx);
+ ieee80211_recalc_smps_chanctx(local, ctx);
+ }
+}
+
+static void __ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
+{
+ struct ieee80211_local *local = sdata->local;
+ struct ieee80211_chanctx_conf *conf;
+ struct ieee80211_chanctx *ctx;
+
+ lockdep_assert_held(&local->chanctx_mtx);
+
+ conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
+ lockdep_is_held(&local->chanctx_mtx));
+ if (!conf)
+ return;
+
+ ctx = container_of(conf, struct ieee80211_chanctx, conf);
+
+ ieee80211_unassign_vif_chanctx(sdata, ctx);
+ if (ctx->refcount == 0)
+ ieee80211_free_chanctx(local, ctx);
+}
+
+void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local,
+ struct ieee80211_chanctx *chanctx)
+{
+ struct ieee80211_sub_if_data *sdata;
+ u8 rx_chains_static, rx_chains_dynamic;
+
+ lockdep_assert_held(&local->chanctx_mtx);
+
+ rx_chains_static = 1;
+ rx_chains_dynamic = 1;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(sdata, &local->interfaces, list) {
+ u8 needed_static, needed_dynamic;
+
if (!ieee80211_sdata_running(sdata))
continue;
+ if (rcu_access_pointer(sdata->vif.chanctx_conf) !=
+ &chanctx->conf)
+ continue;
+
switch (sdata->vif.type) {
- case NL80211_IFTYPE_MONITOR:
+ case NL80211_IFTYPE_P2P_DEVICE:
continue;
case NL80211_IFTYPE_STATION:
if (!sdata->u.mgd.associated)
continue;
break;
- case NL80211_IFTYPE_ADHOC:
- if (!sdata->u.ibss.ssid_len)
- continue;
- if (!sdata->u.ibss.fixed_channel)
- return CHAN_MODE_HOPPING;
- break;
case NL80211_IFTYPE_AP_VLAN:
- /* will also have _AP interface */
continue;
case NL80211_IFTYPE_AP:
- if (!sdata->u.ap.beacon)
- continue;
- break;
+ case NL80211_IFTYPE_ADHOC:
+ case NL80211_IFTYPE_WDS:
case NL80211_IFTYPE_MESH_POINT:
- if (!sdata->wdev.mesh_id_len)
- continue;
break;
default:
+ WARN_ON_ONCE(1);
+ }
+
+ switch (sdata->smps_mode) {
+ default:
+ WARN_ONCE(1, "Invalid SMPS mode %d\n",
+ sdata->smps_mode);
+ /* fall through */
+ case IEEE80211_SMPS_OFF:
+ needed_static = sdata->needed_rx_chains;
+ needed_dynamic = sdata->needed_rx_chains;
+ break;
+ case IEEE80211_SMPS_DYNAMIC:
+ needed_static = 1;
+ needed_dynamic = sdata->needed_rx_chains;
+ break;
+ case IEEE80211_SMPS_STATIC:
+ needed_static = 1;
+ needed_dynamic = 1;
break;
}
- return CHAN_MODE_FIXED;
+ rx_chains_static = max(rx_chains_static, needed_static);
+ rx_chains_dynamic = max(rx_chains_dynamic, needed_dynamic);
}
+ rcu_read_unlock();
- return CHAN_MODE_UNDEFINED;
-}
-
-enum ieee80211_chan_mode
-ieee80211_get_channel_mode(struct ieee80211_local *local,
- struct ieee80211_sub_if_data *ignore)
-{
- enum ieee80211_chan_mode mode;
+ if (!local->use_chanctx) {
+ if (rx_chains_static > 1)
+ local->smps_mode = IEEE80211_SMPS_OFF;
+ else if (rx_chains_dynamic > 1)
+ local->smps_mode = IEEE80211_SMPS_DYNAMIC;
+ else
+ local->smps_mode = IEEE80211_SMPS_STATIC;
+ ieee80211_hw_config(local, 0);
+ }
- mutex_lock(&local->iflist_mtx);
- mode = __ieee80211_get_channel_mode(local, ignore);
- mutex_unlock(&local->iflist_mtx);
+ if (rx_chains_static == chanctx->conf.rx_chains_static &&
+ rx_chains_dynamic == chanctx->conf.rx_chains_dynamic)
+ return;
- return mode;
+ chanctx->conf.rx_chains_static = rx_chains_static;
+ chanctx->conf.rx_chains_dynamic = rx_chains_dynamic;
+ drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RX_CHAINS);
}
-static enum nl80211_channel_type
-ieee80211_get_superchan(struct ieee80211_local *local,
- struct ieee80211_sub_if_data *sdata)
+int ieee80211_vif_use_channel(struct ieee80211_sub_if_data *sdata,
+ const struct cfg80211_chan_def *chandef,
+ enum ieee80211_chanctx_mode mode)
{
- enum nl80211_channel_type superchan = NL80211_CHAN_NO_HT;
- struct ieee80211_sub_if_data *tmp;
+ struct ieee80211_local *local = sdata->local;
+ struct ieee80211_chanctx *ctx;
+ int ret;
- mutex_lock(&local->iflist_mtx);
- list_for_each_entry(tmp, &local->interfaces, list) {
- if (tmp == sdata)
- continue;
-
- if (!ieee80211_sdata_running(tmp))
- continue;
+ WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
- switch (tmp->vif.bss_conf.channel_type) {
- case NL80211_CHAN_NO_HT:
- case NL80211_CHAN_HT20:
- if (superchan > tmp->vif.bss_conf.channel_type)
- break;
+ mutex_lock(&local->chanctx_mtx);
+ __ieee80211_vif_release_channel(sdata);
- superchan = tmp->vif.bss_conf.channel_type;
- break;
- case NL80211_CHAN_HT40PLUS:
- WARN_ON(superchan == NL80211_CHAN_HT40MINUS);
- superchan = NL80211_CHAN_HT40PLUS;
- break;
- case NL80211_CHAN_HT40MINUS:
- WARN_ON(superchan == NL80211_CHAN_HT40PLUS);
- superchan = NL80211_CHAN_HT40MINUS;
- break;
- }
+ ctx = ieee80211_find_chanctx(local, chandef, mode);
+ if (!ctx)
+ ctx = ieee80211_new_chanctx(local, chandef, mode);
+ if (IS_ERR(ctx)) {
+ ret = PTR_ERR(ctx);
+ goto out;
}
- mutex_unlock(&local->iflist_mtx);
- return superchan;
-}
+ sdata->vif.bss_conf.chandef = *chandef;
-static bool
-ieee80211_channel_types_are_compatible(enum nl80211_channel_type chantype1,
- enum nl80211_channel_type chantype2,
- enum nl80211_channel_type *compat)
-{
- /*
- * start out with chantype1 being the result,
- * overwriting later if needed
- */
- if (compat)
- *compat = chantype1;
-
- switch (chantype1) {
- case NL80211_CHAN_NO_HT:
- if (compat)
- *compat = chantype2;
- break;
- case NL80211_CHAN_HT20:
- /*
- * allow any change that doesn't go to no-HT
- * (if it already is no-HT no change is needed)
- */
- if (chantype2 == NL80211_CHAN_NO_HT)
- break;
- if (compat)
- *compat = chantype2;
- break;
- case NL80211_CHAN_HT40PLUS:
- case NL80211_CHAN_HT40MINUS:
- /* allow smaller bandwidth and same */
- if (chantype2 == NL80211_CHAN_NO_HT)
- break;
- if (chantype2 == NL80211_CHAN_HT20)
- break;
- if (chantype2 == chantype1)
- break;
- return false;
+ ret = ieee80211_assign_vif_chanctx(sdata, ctx);
+ if (ret) {
+ /* if assign fails refcount stays the same */
+ if (ctx->refcount == 0)
+ ieee80211_free_chanctx(local, ctx);
+ goto out;
}
- return true;
+ ieee80211_recalc_smps_chanctx(local, ctx);
+ out:
+ mutex_unlock(&local->chanctx_mtx);
+ return ret;
}
-bool ieee80211_set_channel_type(struct ieee80211_local *local,
- struct ieee80211_sub_if_data *sdata,
- enum nl80211_channel_type chantype)
+void ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
{
- enum nl80211_channel_type superchan;
- enum nl80211_channel_type compatchan;
-
- superchan = ieee80211_get_superchan(local, sdata);
- if (!ieee80211_channel_types_are_compatible(superchan, chantype,
- &compatchan))
- return false;
+ WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
- local->_oper_channel_type = compatchan;
-
- if (sdata)
- sdata->vif.bss_conf.channel_type = chantype;
+ mutex_lock(&sdata->local->chanctx_mtx);
+ __ieee80211_vif_release_channel(sdata);
+ mutex_unlock(&sdata->local->chanctx_mtx);
+}
- return true;
+void ieee80211_iter_chan_contexts_atomic(
+ struct ieee80211_hw *hw,
+ void (*iter)(struct ieee80211_hw *hw,
+ struct ieee80211_chanctx_conf *chanctx_conf,
+ void *data),
+ void *iter_data)
+{
+ struct ieee80211_local *local = hw_to_local(hw);
+ struct ieee80211_chanctx *ctx;
+ rcu_read_lock();
+ list_for_each_entry_rcu(ctx, &local->chanctx_list, list)
+ iter(hw, &ctx->conf, iter_data);
+ rcu_read_unlock();
}
+EXPORT_SYMBOL_GPL(ieee80211_iter_chan_contexts_atomic);