+++ /dev/null
-From 0d2ab3aea50bb02ff0c9c3d53c7b2b4b21cdd59d Mon Sep 17 00:00:00 2001
-From: John Crispin <john@phrozen.org>
-Date: Fri, 2 Jul 2021 19:44:07 +0200
-Subject: [PATCH] nl80211: add support for BSS coloring
-
-This patch adds support for BSS color collisions to the wireless subsystem.
-Add the required functionality to nl80211 that will notify about color
-collisions, triggering the color change and notifying when it is completed.
-
-Co-developed-by: Lorenzo Bianconi <lorenzo@kernel.org>
-Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
-Signed-off-by: John Crispin <john@phrozen.org>
-Link: https://lore.kernel.org/r/500b3582aec8fe2c42ef46f3117b148cb7cbceb5.1625247619.git.lorenzo@kernel.org
-[remove unnecessary NULL initialisation]
-Signed-off-by: Johannes Berg <johannes.berg@intel.com>
----
- include/net/cfg80211.h | 92 ++++++++++++++++++++
- include/uapi/linux/nl80211.h | 43 ++++++++++
- net/wireless/nl80211.c | 157 +++++++++++++++++++++++++++++++++++
- net/wireless/rdev-ops.h | 13 +++
- net/wireless/trace.h | 46 ++++++++++
- 5 files changed, 351 insertions(+)
-
---- a/include/net/cfg80211.h
-+++ b/include/net/cfg80211.h
-@@ -1258,6 +1258,27 @@ struct cfg80211_csa_settings {
- };
-
- /**
-+ * struct cfg80211_color_change_settings - color change settings
-+ *
-+ * Used for bss color change
-+ *
-+ * @beacon_color_change: beacon data while performing the color countdown
-+ * @counter_offsets_beacon: offsets of the counters within the beacon (tail)
-+ * @counter_offsets_presp: offsets of the counters within the probe response
-+ * @beacon_next: beacon data to be used after the color change
-+ * @count: number of beacons until the color change
-+ * @color: the color used after the change
-+ */
-+struct cfg80211_color_change_settings {
-+ struct cfg80211_beacon_data beacon_color_change;
-+ u16 counter_offset_beacon;
-+ u16 counter_offset_presp;
-+ struct cfg80211_beacon_data beacon_next;
-+ u8 count;
-+ u8 color;
-+};
-+
-+/**
- * struct iface_combination_params - input parameters for interface combinations
- *
- * Used to pass interface combination parameters
-@@ -4000,6 +4021,8 @@ struct mgmt_frame_regs {
- * given TIDs. This callback may sleep.
- *
- * @set_sar_specs: Update the SAR (TX power) settings.
-+ *
-+ * @color_change: Initiate a color change.
- */
- struct cfg80211_ops {
- int (*suspend)(struct wiphy *wiphy, struct cfg80211_wowlan *wow);
-@@ -4327,6 +4350,9 @@ struct cfg80211_ops {
- const u8 *peer, u8 tids);
- int (*set_sar_specs)(struct wiphy *wiphy,
- struct cfg80211_sar_specs *sar);
-+ int (*color_change)(struct wiphy *wiphy,
-+ struct net_device *dev,
-+ struct cfg80211_color_change_settings *params);
- };
-
- /*
-@@ -8226,4 +8252,70 @@ void cfg80211_update_owe_info_event(stru
- */
- void cfg80211_bss_flush(struct wiphy *wiphy);
-
-+/**
-+ * cfg80211_bss_color_notify - notify about bss color event
-+ * @dev: network device
-+ * @gfp: allocation flags
-+ * @cmd: the actual event we want to notify
-+ * @count: the number of TBTTs until the color change happens
-+ * @color_bitmap: representations of the colors that the local BSS is aware of
-+ */
-+int cfg80211_bss_color_notify(struct net_device *dev, gfp_t gfp,
-+ enum nl80211_commands cmd, u8 count,
-+ u64 color_bitmap);
-+
-+/**
-+ * cfg80211_obss_color_collision_notify - notify about bss color collision
-+ * @dev: network device
-+ * @color_bitmap: representations of the colors that the local BSS is aware of
-+ */
-+static inline int cfg80211_obss_color_collision_notify(struct net_device *dev,
-+ u64 color_bitmap)
-+{
-+ return cfg80211_bss_color_notify(dev, GFP_KERNEL,
-+ NL80211_CMD_OBSS_COLOR_COLLISION,
-+ 0, color_bitmap);
-+}
-+
-+/**
-+ * cfg80211_color_change_started_notify - notify color change start
-+ * @dev: the device on which the color is switched
-+ * @count: the number of TBTTs until the color change happens
-+ *
-+ * Inform the userspace about the color change that has started.
-+ */
-+static inline int cfg80211_color_change_started_notify(struct net_device *dev,
-+ u8 count)
-+{
-+ return cfg80211_bss_color_notify(dev, GFP_KERNEL,
-+ NL80211_CMD_COLOR_CHANGE_STARTED,
-+ count, 0);
-+}
-+
-+/**
-+ * cfg80211_color_change_aborted_notify - notify color change abort
-+ * @dev: the device on which the color is switched
-+ *
-+ * Inform the userspace about the color change that has aborted.
-+ */
-+static inline int cfg80211_color_change_aborted_notify(struct net_device *dev)
-+{
-+ return cfg80211_bss_color_notify(dev, GFP_KERNEL,
-+ NL80211_CMD_COLOR_CHANGE_ABORTED,
-+ 0, 0);
-+}
-+
-+/**
-+ * cfg80211_color_change_notify - notify color change completion
-+ * @dev: the device on which the color was switched
-+ *
-+ * Inform the userspace about the color change that has completed.
-+ */
-+static inline int cfg80211_color_change_notify(struct net_device *dev)
-+{
-+ return cfg80211_bss_color_notify(dev, GFP_KERNEL,
-+ NL80211_CMD_COLOR_CHANGE_COMPLETED,
-+ 0, 0);
-+}
-+
- #endif /* __NET_CFG80211_H */
---- a/include/uapi/linux/nl80211.h
-+++ b/include/uapi/linux/nl80211.h
-@@ -1185,6 +1185,21 @@
- * passed using %NL80211_ATTR_SAR_SPEC. %NL80211_ATTR_WIPHY is used to
- * specify the wiphy index to be applied to.
- *
-+ * @NL80211_CMD_OBSS_COLOR_COLLISION: This notification is sent out whenever
-+ * mac80211/drv detects a bss color collision.
-+ *
-+ * @NL80211_CMD_COLOR_CHANGE_REQUEST: This command is used to indicate that
-+ * userspace wants to change the BSS color.
-+ *
-+ * @NL80211_CMD_COLOR_CHANGE_STARTED: Notify userland, that a color change has
-+ * started
-+ *
-+ * @NL80211_CMD_COLOR_CHANGE_ABORTED: Notify userland, that the color change has
-+ * been aborted
-+ *
-+ * @NL80211_CMD_COLOR_CHANGE_COMPLETED: Notify userland that the color change
-+ * has completed
-+ *
- * @NL80211_CMD_MAX: highest used command number
- * @__NL80211_CMD_AFTER_LAST: internal use
- */
-@@ -1417,6 +1432,14 @@ enum nl80211_commands {
-
- NL80211_CMD_SET_SAR_SPECS,
-
-+ NL80211_CMD_OBSS_COLOR_COLLISION,
-+
-+ NL80211_CMD_COLOR_CHANGE_REQUEST,
-+
-+ NL80211_CMD_COLOR_CHANGE_STARTED,
-+ NL80211_CMD_COLOR_CHANGE_ABORTED,
-+ NL80211_CMD_COLOR_CHANGE_COMPLETED,
-+
- /* add new commands above here */
-
- /* used to define NL80211_CMD_MAX below */
-@@ -2560,6 +2583,16 @@ enum nl80211_commands {
- * disassoc events to indicate that an immediate reconnect to the AP
- * is desired.
- *
-+ * @NL80211_ATTR_OBSS_COLOR_BITMAP: bitmap of the u64 BSS colors for the
-+ * %NL80211_CMD_OBSS_COLOR_COLLISION event.
-+ *
-+ * @NL80211_ATTR_COLOR_CHANGE_COUNT: u8 attribute specifying the number of TBTT's
-+ * until the color switch event.
-+ * @NL80211_ATTR_COLOR_CHANGE_COLOR: u8 attribute specifying the color that we are
-+ * switching to
-+ * @NL80211_ATTR_COLOR_CHANGE_ELEMS: Nested set of attributes containing the IE
-+ * information for the time while performing a color switch.
-+ *
- * @NUM_NL80211_ATTR: total number of nl80211_attrs available
- * @NL80211_ATTR_MAX: highest attribute number currently defined
- * @__NL80211_ATTR_AFTER_LAST: internal use
-@@ -3057,6 +3090,12 @@ enum nl80211_attrs {
-
- NL80211_ATTR_DISABLE_HE,
-
-+ NL80211_ATTR_OBSS_COLOR_BITMAP,
-+
-+ NL80211_ATTR_COLOR_CHANGE_COUNT,
-+ NL80211_ATTR_COLOR_CHANGE_COLOR,
-+ NL80211_ATTR_COLOR_CHANGE_ELEMS,
-+
- /* add attributes here, update the policy in nl80211.c */
-
- __NL80211_ATTR_AFTER_LAST,
-@@ -5953,6 +5992,9 @@ enum nl80211_feature_flags {
- * frame protection for all management frames exchanged during the
- * negotiation and range measurement procedure.
- *
-+ * @NL80211_EXT_FEATURE_BSS_COLOR: The driver supports BSS color collision
-+ * detection and change announcemnts.
-+ *
- * @NUM_NL80211_EXT_FEATURES: number of extended features.
- * @MAX_NL80211_EXT_FEATURES: highest extended feature index.
- */
-@@ -6017,6 +6059,7 @@ enum nl80211_ext_feature_index {
- NL80211_EXT_FEATURE_SECURE_LTF,
- NL80211_EXT_FEATURE_SECURE_RTT,
- NL80211_EXT_FEATURE_PROT_RANGE_NEGO_AND_MEASURE,
-+ NL80211_EXT_FEATURE_BSS_COLOR,
-
- /* add new features before the definition below */
- NUM_NL80211_EXT_FEATURES,
---- a/net/wireless/nl80211.c
-+++ b/net/wireless/nl80211.c
-@@ -776,6 +776,10 @@ static const struct nla_policy nl80211_p
- [NL80211_ATTR_RECONNECT_REQUESTED] = { .type = NLA_REJECT },
- [NL80211_ATTR_SAR_SPEC] = NLA_POLICY_NESTED(sar_policy),
- [NL80211_ATTR_DISABLE_HE] = { .type = NLA_FLAG },
-+ [NL80211_ATTR_OBSS_COLOR_BITMAP] = { .type = NLA_U64 },
-+ [NL80211_ATTR_COLOR_CHANGE_COUNT] = { .type = NLA_U8 },
-+ [NL80211_ATTR_COLOR_CHANGE_COLOR] = { .type = NLA_U8 },
-+ [NL80211_ATTR_COLOR_CHANGE_ELEMS] = NLA_POLICY_NESTED(nl80211_policy),
- };
-
- /* policy for the key attributes */
-@@ -14823,6 +14827,106 @@ bad_tid_conf:
- return ret;
- }
-
-+static int nl80211_color_change(struct sk_buff *skb, struct genl_info *info)
-+{
-+ struct cfg80211_registered_device *rdev = info->user_ptr[0];
-+ struct cfg80211_color_change_settings params = {};
-+ struct net_device *dev = info->user_ptr[1];
-+ struct wireless_dev *wdev = dev->ieee80211_ptr;
-+ struct nlattr **tb;
-+ u16 offset;
-+ int err;
-+
-+ if (!rdev->ops->color_change)
-+ return -EOPNOTSUPP;
-+
-+ if (!wiphy_ext_feature_isset(&rdev->wiphy,
-+ NL80211_EXT_FEATURE_BSS_COLOR))
-+ return -EOPNOTSUPP;
-+
-+ if (wdev->iftype != NL80211_IFTYPE_AP)
-+ return -EOPNOTSUPP;
-+
-+ if (!info->attrs[NL80211_ATTR_COLOR_CHANGE_COUNT] ||
-+ !info->attrs[NL80211_ATTR_COLOR_CHANGE_COLOR] ||
-+ !info->attrs[NL80211_ATTR_COLOR_CHANGE_ELEMS])
-+ return -EINVAL;
-+
-+ params.count = nla_get_u8(info->attrs[NL80211_ATTR_COLOR_CHANGE_COUNT]);
-+ params.color = nla_get_u8(info->attrs[NL80211_ATTR_COLOR_CHANGE_COLOR]);
-+
-+ err = nl80211_parse_beacon(rdev, info->attrs, ¶ms.beacon_next);
-+ if (err)
-+ return err;
-+
-+ tb = kcalloc(NL80211_ATTR_MAX + 1, sizeof(*tb), GFP_KERNEL);
-+ if (!tb)
-+ return -ENOMEM;
-+
-+ err = nla_parse_nested(tb, NL80211_ATTR_MAX,
-+ info->attrs[NL80211_ATTR_COLOR_CHANGE_ELEMS],
-+ nl80211_policy, info->extack);
-+ if (err)
-+ goto out;
-+
-+ err = nl80211_parse_beacon(rdev, tb, ¶ms.beacon_color_change);
-+ if (err)
-+ goto out;
-+
-+ if (!tb[NL80211_ATTR_CNTDWN_OFFS_BEACON]) {
-+ err = -EINVAL;
-+ goto out;
-+ }
-+
-+ if (nla_len(tb[NL80211_ATTR_CNTDWN_OFFS_BEACON]) != sizeof(u16)) {
-+ err = -EINVAL;
-+ goto out;
-+ }
-+
-+ offset = nla_get_u16(tb[NL80211_ATTR_CNTDWN_OFFS_BEACON]);
-+ if (offset >= params.beacon_color_change.tail_len) {
-+ err = -EINVAL;
-+ goto out;
-+ }
-+
-+ if (params.beacon_color_change.tail[offset] != params.count) {
-+ err = -EINVAL;
-+ goto out;
-+ }
-+
-+ params.counter_offset_beacon = offset;
-+
-+ if (tb[NL80211_ATTR_CNTDWN_OFFS_PRESP]) {
-+ if (nla_len(tb[NL80211_ATTR_CNTDWN_OFFS_PRESP]) !=
-+ sizeof(u16)) {
-+ err = -EINVAL;
-+ goto out;
-+ }
-+
-+ offset = nla_get_u16(tb[NL80211_ATTR_CNTDWN_OFFS_PRESP]);
-+ if (offset >= params.beacon_color_change.probe_resp_len) {
-+ err = -EINVAL;
-+ goto out;
-+ }
-+
-+ if (params.beacon_color_change.probe_resp[offset] !=
-+ params.count) {
-+ err = -EINVAL;
-+ goto out;
-+ }
-+
-+ params.counter_offset_presp = offset;
-+ }
-+
-+ wdev_lock(wdev);
-+ err = rdev_color_change(rdev, dev, ¶ms);
-+ wdev_unlock(wdev);
-+
-+out:
-+ kfree(tb);
-+ return err;
-+}
-+
- #define NL80211_FLAG_NEED_WIPHY 0x01
- #define NL80211_FLAG_NEED_NETDEV 0x02
- #define NL80211_FLAG_NEED_RTNL 0x04
-@@ -15823,6 +15927,14 @@ static const struct genl_small_ops nl802
- .internal_flags = NL80211_FLAG_NEED_WIPHY |
- NL80211_FLAG_NEED_RTNL,
- },
-+ {
-+ .cmd = NL80211_CMD_COLOR_CHANGE_REQUEST,
-+ .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
-+ .doit = nl80211_color_change,
-+ .flags = GENL_UNS_ADMIN_PERM,
-+ .internal_flags = NL80211_FLAG_NEED_NETDEV_UP |
-+ NL80211_FLAG_NEED_RTNL,
-+ },
- };
-
- static struct genl_family nl80211_fam __genl_ro_after_init = {
-@@ -17454,6 +17566,51 @@ void cfg80211_ch_switch_started_notify(s
- }
- EXPORT_SYMBOL(cfg80211_ch_switch_started_notify);
-
-+int cfg80211_bss_color_notify(struct net_device *dev, gfp_t gfp,
-+ enum nl80211_commands cmd, u8 count,
-+ u64 color_bitmap)
-+{
-+ struct wireless_dev *wdev = dev->ieee80211_ptr;
-+ struct wiphy *wiphy = wdev->wiphy;
-+ struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
-+ struct sk_buff *msg;
-+ void *hdr;
-+
-+ ASSERT_WDEV_LOCK(wdev);
-+
-+ trace_cfg80211_bss_color_notify(dev, cmd, count, color_bitmap);
-+
-+ msg = nlmsg_new(NLMSG_DEFAULT_SIZE, gfp);
-+ if (!msg)
-+ return -ENOMEM;
-+
-+ hdr = nl80211hdr_put(msg, 0, 0, 0, cmd);
-+ if (!hdr)
-+ goto nla_put_failure;
-+
-+ if (nla_put_u32(msg, NL80211_ATTR_IFINDEX, dev->ifindex))
-+ goto nla_put_failure;
-+
-+ if (cmd == NL80211_CMD_COLOR_CHANGE_STARTED &&
-+ nla_put_u32(msg, NL80211_ATTR_COLOR_CHANGE_COUNT, count))
-+ goto nla_put_failure;
-+
-+ if (cmd == NL80211_CMD_OBSS_COLOR_COLLISION &&
-+ nla_put_u64_64bit(msg, NL80211_ATTR_OBSS_COLOR_BITMAP,
-+ color_bitmap, NL80211_ATTR_PAD))
-+ goto nla_put_failure;
-+
-+ genlmsg_end(msg, hdr);
-+
-+ return genlmsg_multicast_netns(&nl80211_fam, wiphy_net(&rdev->wiphy),
-+ msg, 0, NL80211_MCGRP_MLME, gfp);
-+
-+nla_put_failure:
-+ nlmsg_free(msg);
-+ return -EINVAL;
-+}
-+EXPORT_SYMBOL(cfg80211_bss_color_notify);
-+
- void
- nl80211_radar_notify(struct cfg80211_registered_device *rdev,
- const struct cfg80211_chan_def *chandef,
---- a/net/wireless/rdev-ops.h
-+++ b/net/wireless/rdev-ops.h
-@@ -1368,4 +1368,17 @@ static inline int rdev_set_sar_specs(str
- return ret;
- }
-
-+static inline int rdev_color_change(struct cfg80211_registered_device *rdev,
-+ struct net_device *dev,
-+ struct cfg80211_color_change_settings *params)
-+{
-+ int ret;
-+
-+ trace_rdev_color_change(&rdev->wiphy, dev, params);
-+ ret = rdev->ops->color_change(&rdev->wiphy, dev, params);
-+ trace_rdev_return_int(&rdev->wiphy, ret);
-+
-+ return ret;
-+}
-+
- #endif /* __CFG80211_RDEV_OPS */
---- a/net/wireless/trace.h
-+++ b/net/wireless/trace.h
-@@ -3597,6 +3597,52 @@ TRACE_EVENT(rdev_set_sar_specs,
- WIPHY_PR_ARG, __entry->type, __entry->num)
- );
-
-+TRACE_EVENT(rdev_color_change,
-+ TP_PROTO(struct wiphy *wiphy, struct net_device *netdev,
-+ struct cfg80211_color_change_settings *params),
-+ TP_ARGS(wiphy, netdev, params),
-+ TP_STRUCT__entry(
-+ WIPHY_ENTRY
-+ NETDEV_ENTRY
-+ __field(u8, count)
-+ __field(u16, bcn_ofs)
-+ __field(u16, pres_ofs)
-+ ),
-+ TP_fast_assign(
-+ WIPHY_ASSIGN;
-+ NETDEV_ASSIGN;
-+ __entry->count = params->count;
-+ __entry->bcn_ofs = params->counter_offset_beacon;
-+ __entry->pres_ofs = params->counter_offset_presp;
-+ ),
-+ TP_printk(WIPHY_PR_FMT ", " NETDEV_PR_FMT
-+ ", count: %u",
-+ WIPHY_PR_ARG, NETDEV_PR_ARG,
-+ __entry->count)
-+);
-+
-+TRACE_EVENT(cfg80211_bss_color_notify,
-+ TP_PROTO(struct net_device *netdev,
-+ enum nl80211_commands cmd,
-+ u8 count, u64 color_bitmap),
-+ TP_ARGS(netdev, cmd, count, color_bitmap),
-+ TP_STRUCT__entry(
-+ NETDEV_ENTRY
-+ __field(enum nl80211_bss_scan_width, cmd)
-+ __field(u8, count)
-+ __field(u64, color_bitmap)
-+ ),
-+ TP_fast_assign(
-+ NETDEV_ASSIGN;
-+ __entry->cmd = cmd;
-+ __entry->count = count;
-+ __entry->color_bitmap = color_bitmap;
-+ ),
-+ TP_printk(NETDEV_PR_FMT ", cmd: %x, count: %u, bitmap: %llx",
-+ NETDEV_PR_ARG, __entry->cmd, __entry->count,
-+ __entry->color_bitmap)
-+);
-+
- #endif /* !__RDEV_OPS_TRACE || TRACE_HEADER_MULTI_READ */
-
- #undef TRACE_INCLUDE_PATH
projects / openwrt / openwrt.git / blobdiff