[wpan-next,v2,21/27] net: mac802154: Handle beacons requests

Message ID	20220112173312.764660-22-miquel.raynal@bootlin.com (mailing list archive)
State	Not Applicable
Delegated to:	Johannes Berg
Headers	show Return-Path: <linux-wireless-owner@kernel.org> X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 995FBC433F5 for <linux-wireless@archiver.kernel.org>; Wed, 12 Jan 2022 17:34:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1355744AbiALRe2 (ORCPT <rfc822;linux-wireless@archiver.kernel.org>); Wed, 12 Jan 2022 12:34:28 -0500 Received: from relay7-d.mail.gandi.net ([217.70.183.200]:55733 "EHLO relay7-d.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1355720AbiALReC (ORCPT <rfc822;linux-wireless@vger.kernel.org>); Wed, 12 Jan 2022 12:34:02 -0500 Received: (Authenticated sender: miquel.raynal@bootlin.com) by relay7-d.mail.gandi.net (Postfix) with ESMTPSA id 152B420004; Wed, 12 Jan 2022 17:33:58 +0000 (UTC) From: Miquel Raynal <miquel.raynal@bootlin.com> To: Alexander Aring <alex.aring@gmail.com>, Stefan Schmidt <stefan@datenfreihafen.org>, linux-wpan@vger.kernel.org, "David S. Miller" <davem@davemloft.net>, Jakub Kicinski <kuba@kernel.org>, netdev@vger.kernel.org Cc: Michael Hennerich <michael.hennerich@analog.com>, Harry Morris <h.morris@cascoda.com>, Varka Bhadram <varkabhadram@gmail.com>, Xue Liu <liuxuenetmail@gmail.com>, Alan Ott <alan@signal11.us>, David Girault <david.girault@qorvo.com>, Romuald Despres <romuald.despres@qorvo.com>, Frederic Blain <frederic.blain@qorvo.com>, Nicolas Schodet <nico@ni.fr.eu.org>, Thomas Petazzoni <thomas.petazzoni@bootlin.com>, linux-wireless@vger.kernel.org, Miquel Raynal <miquel.raynal@bootlin.com> Subject: [wpan-next v2 21/27] net: mac802154: Handle beacons requests Date: Wed, 12 Jan 2022 18:33:06 +0100 Message-Id: <20220112173312.764660-22-miquel.raynal@bootlin.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20220112173312.764660-1-miquel.raynal@bootlin.com> References: <20220112173312.764660-1-miquel.raynal@bootlin.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: <linux-wireless.vger.kernel.org> X-Mailing-List: linux-wireless@vger.kernel.org
Series	IEEE 802.15.4 scan support \| expand [wpan-next,v2,00/27] IEEE 802.15.4 scan support [wpan-next,v2,01/27] net: mac802154: Split the set channel hook implementation [wpan-next,v2,02/27] net: mac802154: Ensure proper channel selection at probe time [wpan-next,v2,03/27] net: ieee802154: Improve the way supported channels are declared [wpan-next,v2,04/27] net: ieee802154: Give more details to the core about the channel configurations [wpan-next,v2,05/27] net: mac802154: Convert the symbol duration into nanoseconds [wpan-next,v2,06/27] net: mac802154: Set the symbol duration automatically [wpan-next,v2,07/27] net: ieee802154: hwsim: Ensure frame checksum are valid [wpan-next,v2,08/27] net: ieee802154: Drop symbol duration settings when the core does it already [wpan-next,v2,09/27] net: ieee802154: Move IEEE 802.15.4 Kconfig main entry [wpan-next,v2,10/27] net: mac802154: Include the softMAC stack inside the IEEE 802.15.4 menu [wpan-next,v2,11/27] net: ieee802154: Move the address structure earlier [wpan-next,v2,12/27] net: ieee802154: Add a kernel doc header to the ieee802154_addr structure [wpan-next,v2,13/27] net: ieee802154: Return meaningful error codes from the netlink helpers [wpan-next,v2,14/27] net: ieee802154: Add support for internal PAN management [wpan-next,v2,15/27] net: ieee802154: Define a beacon frame header [wpan-next,v2,16/27] net: ieee802154: Define frame types [wpan-next,v2,17/27] net: ieee802154: Add support for scanning requests [wpan-next,v2,18/27] net: mac802154: Handle scan requests [wpan-next,v2,19/27] net: ieee802154: Full PAN management [wpan-next,v2,20/27] net: ieee802154: Add support for beacon requests [wpan-next,v2,21/27] net: mac802154: Handle beacons requests [wpan-next,v2,22/27] net: ieee802154: Trace the registration of new PANs [wpan-next,v2,23/27] net: mac802154: Add support for active scans [wpan-next,v2,24/27] net: mac802154: Add support for processing beacon requests [wpan-next,v2,25/27] net: mac802154: Inform device drivers about scans [wpan-next,v2,26/27] net: mac802154: Inform device drivers about beacon operations [wpan-next,v2,27/27] net: ieee802154: ca8210: Refuse most of the scan operations

diff --git a/include/net/ieee802154_netdev.h b/include/net/ieee802154_netdev.h index 45dff5d11bc8..f7716aeec93b 100644 --- a/include/net/ieee802154_netdev.h +++ b/include/net/ieee802154_netdev.h @@ -116,6 +116,21 @@ enum ieee802154_frame_type { IEEE802154_EXTENDED_FRAME, }; +enum ieee802154_frame_version { + IEEE802154_2003_STD, + IEEE802154_2006_STD, + IEEE802154_STD, + IEEE802154_RESERVED_STD, + IEEE802154_MULTIPURPOSE_STD = IEEE802154_2003_STD, +}; + +enum ieee802154_addressing_mode { + IEEE802154_NO_ADDRESSING, + IEEE802154_RESERVED, + IEEE802154_SHORT_ADDRESSING, + IEEE802154_EXTENDED_ADDRESSING, +}; + struct ieee802154_hdr { struct ieee802154_hdr_fc fc; u8 seq; @@ -124,6 +139,11 @@ struct ieee802154_hdr { struct ieee802154_sechdr sec; }; +struct ieee802154_beacon_frame { + struct ieee802154_hdr mhr; + struct ieee802154_beacon_hdr mac_pl; +}; + /* pushes hdr onto the skb. fields of hdr->fc that can be calculated from * the contents of hdr will be, and the actual value of those bits in * hdr->fc will be ignored. this includes the INTRA_PAN bit and the frame @@ -149,6 +169,10 @@ int ieee802154_hdr_peek_addrs(const struct sk_buff *skb, */ int ieee802154_hdr_peek(const struct sk_buff *skb, struct ieee802154_hdr *hdr); +/* pushes a beacon frame into an skb */ +int ieee802154_beacon_push(struct sk_buff *skb, + struct ieee802154_beacon_frame *beacon); + int ieee802154_max_payload(const struct ieee802154_hdr *hdr); static inline int diff --git a/net/ieee802154/header_ops.c b/net/ieee802154/header_ops.c index af337cf62764..bab710aa36f9 100644 --- a/net/ieee802154/header_ops.c +++ b/net/ieee802154/header_ops.c @@ -6,6 +6,7 @@ * Phoebe Buckheister <phoebe.buckheister@itwm.fraunhofer.de> */ +#include <linux/crc-ccitt.h> #include <linux/ieee802154.h> #include <net/mac802154.h> @@ -120,6 +121,34 @@ ieee802154_hdr_push(struct sk_buff *skb, struct ieee802154_hdr *hdr) } EXPORT_SYMBOL_GPL(ieee802154_hdr_push); +int ieee802154_beacon_push(struct sk_buff *skb, + struct ieee802154_beacon_frame *beacon) +{ + struct ieee802154_beacon_hdr *mac_pl = &beacon->mac_pl; + struct ieee802154_hdr *mhr = &beacon->mhr; + u16 crc; + int ret; + + skb_reserve(skb, sizeof(*mhr)); + ret = ieee802154_hdr_push(skb, mhr); + if (ret < 0) + return ret; + + skb_reset_mac_header(skb); + skb->mac_len = ret; + + skb_put_data(skb, mac_pl, sizeof(*mac_pl)); + + if (mac_pl->pend_short_addr_count || mac_pl->pend_ext_addr_count) + return -EOPNOTSUPP; + + crc = crc_ccitt(0, skb->data, skb->len); + put_unaligned_le16(crc, skb_put(skb, 2)); + + return 0; +} +EXPORT_SYMBOL_GPL(ieee802154_beacon_push); + static int ieee802154_hdr_get_addr(const u8 *buf, int mode, bool omit_pan, struct ieee802154_addr *addr) diff --git a/net/mac802154/cfg.c b/net/mac802154/cfg.c index c1e7bbea3058..afba02c31850 100644 --- a/net/mac802154/cfg.c +++ b/net/mac802154/cfg.c @@ -109,8 +109,10 @@ int ieee802154_change_channel(struct wpan_phy *wpan_phy, u8 page, u8 channel) ASSERT_RTNL(); - /* Refuse to change channels during a scanning operation */ - if (mac802154_scan_is_ongoing(local)) + /* Refuse to change channels during a scanning operation or when a + * beacons request is ongoing. + */ + if (mac802154_scan_is_ongoing(local) || local->ongoing_beacons_request) return -EBUSY; ret = drv_set_channel(local, page, channel); @@ -305,6 +307,39 @@ static int mac802154_abort_scan(struct wpan_phy *wpan_phy, return ret; } +static int mac802154_send_beacons(struct wpan_phy *wpan_phy, + struct cfg802154_beacons_request *request) +{ + struct ieee802154_local *local = wpan_phy_priv(wpan_phy); + struct ieee802154_sub_if_data *sdata; + int ret; + + sdata = IEEE802154_WPAN_DEV_TO_SUB_IF(request->wpan_dev); + + ASSERT_RTNL(); + + mutex_lock(&local->beacons_lock); + ret = mac802154_send_beacons_locked(sdata, request); + mutex_unlock(&local->beacons_lock); + + return ret; +} + +static int mac802154_stop_beacons(struct wpan_phy *wpan_phy, + struct wpan_dev *wpan_dev) +{ + struct ieee802154_local *local = wpan_phy_priv(wpan_phy); + int ret; + + ASSERT_RTNL(); + + mutex_lock(&local->beacons_lock); + ret = mac802154_stop_beacons_locked(local); + mutex_unlock(&local->beacons_lock); + + return ret; +} + #ifdef CONFIG_IEEE802154_NL802154_EXPERIMENTAL static void ieee802154_get_llsec_table(struct wpan_phy *wpan_phy, @@ -514,6 +549,8 @@ const struct cfg802154_ops mac802154_config_ops = { .set_ackreq_default = ieee802154_set_ackreq_default, .trigger_scan = mac802154_trigger_scan, .abort_scan = mac802154_abort_scan, + .send_beacons = mac802154_send_beacons, + .stop_beacons = mac802154_stop_beacons, #ifdef CONFIG_IEEE802154_NL802154_EXPERIMENTAL .get_llsec_table = ieee802154_get_llsec_table, .lock_llsec_table = ieee802154_lock_llsec_table, diff --git a/net/mac802154/ieee802154_i.h b/net/mac802154/ieee802154_i.h index 5cc3ac8fd4a1..4feb9181ff4f 100644 --- a/net/mac802154/ieee802154_i.h +++ b/net/mac802154/ieee802154_i.h @@ -57,6 +57,14 @@ struct ieee802154_local { struct ieee802154_sub_if_data __rcu *scan_sdata; struct delayed_work scan_work; + /* Beacons handling */ + bool ongoing_beacons_request; + struct mutex beacons_lock; + unsigned int beacons_interval; + struct delayed_work beacons_work; + struct ieee802154_sub_if_data __rcu *beacons_sdata; + struct ieee802154_beacon_frame beacon; + bool started; bool suspended; @@ -189,6 +197,11 @@ static inline bool mac802154_scan_is_ongoing(struct ieee802154_local *local) return atomic_read(&local->scanning); } +void mac802154_beacons_work(struct work_struct *work); +int mac802154_send_beacons_locked(struct ieee802154_sub_if_data *sdata, + struct cfg802154_beacons_request *request); +int mac802154_stop_beacons_locked(struct ieee802154_local *local); + /* interface handling */ int ieee802154_iface_init(void); void ieee802154_iface_exit(void); diff --git a/net/mac802154/main.c b/net/mac802154/main.c index 09e2fc6848cb..f342c7c5165e 100644 --- a/net/mac802154/main.c +++ b/net/mac802154/main.c @@ -91,6 +91,7 @@ ieee802154_alloc_hw(size_t priv_data_len, const struct ieee802154_ops *ops) INIT_LIST_HEAD(&local->interfaces); mutex_init(&local->iflist_mtx); mutex_init(&local->scan_lock); + mutex_init(&local->beacons_lock); tasklet_setup(&local->tasklet, ieee802154_tasklet_handler); @@ -98,6 +99,7 @@ ieee802154_alloc_hw(size_t priv_data_len, const struct ieee802154_ops *ops) INIT_WORK(&local->tx_work, ieee802154_xmit_worker); INIT_DELAYED_WORK(&local->scan_work, mac802154_scan_work); + INIT_DELAYED_WORK(&local->beacons_work, mac802154_beacons_work); /* init supported flags with 802.15.4 default ranges */ phy->supported.max_minbe = 8; diff --git a/net/mac802154/scan.c b/net/mac802154/scan.c index 7be63d73caa9..091cf6fdff41 100644 --- a/net/mac802154/scan.c +++ b/net/mac802154/scan.c @@ -17,6 +17,13 @@ #include "driver-ops.h" #include "../ieee802154/nl802154.h" +#define IEEE802154_BEACON_MHR_SZ 13 +#define IEEE802154_BEACON_PL_SZ 4 +#define IEEE802154_CRC_SZ 2 +#define IEEE802154_BEACON_SKB_SZ (IEEE802154_BEACON_MHR_SZ + \ + IEEE802154_BEACON_PL_SZ + \ + IEEE802154_CRC_SZ) + static bool mac802154_check_promiscuous(struct ieee802154_local *local) { struct ieee802154_sub_if_data *sdata; @@ -104,6 +111,86 @@ static unsigned int mac802154_scan_get_channel_time(u8 duration_order, (BIT(duration_order) + 1)); } +int mac802154_send_beacons_locked(struct ieee802154_sub_if_data *sdata, + struct cfg802154_beacons_request *request) +{ + struct ieee802154_local *local = sdata->local; + + lockdep_assert_held(&local->beacons_lock); + + if (local->ongoing_beacons_request) + return -EBUSY; + + local->ongoing_beacons_request = true; + + memset(&local->beacon, 0, sizeof(local->beacon)); + local->beacon.mhr.fc.type = IEEE802154_BEACON_FRAME; + local->beacon.mhr.fc.security_enabled = 0; + local->beacon.mhr.fc.frame_pending = 0; + local->beacon.mhr.fc.ack_request = 0; + local->beacon.mhr.fc.intra_pan = 0; + local->beacon.mhr.fc.dest_addr_mode = IEEE802154_NO_ADDRESSING; + local->beacon.mhr.fc.version = IEEE802154_2003_STD; + local->beacon.mhr.fc.source_addr_mode = IEEE802154_EXTENDED_ADDRESSING; + atomic_set(&request->wpan_dev->bsn, -1); + local->beacon.mhr.source.mode = IEEE802154_ADDR_LONG; + local->beacon.mhr.source.pan_id = cpu_to_le16(request->wpan_dev->pan_id); + local->beacon.mhr.source.extended_addr = cpu_to_le64(request->wpan_dev->extended_addr); + local->beacon.mac_pl.beacon_order = request->interval; + local->beacon.mac_pl.superframe_order = request->interval; + local->beacon.mac_pl.final_cap_slot = 0xf; + local->beacon.mac_pl.battery_life_ext = 0; + local->beacon.mac_pl.pan_coordinator = 1; + local->beacon.mac_pl.assoc_permit = 1; + + rcu_assign_pointer(local->beacons_sdata, sdata); + + /* Start the beacon work */ + local->beacons_interval = + mac802154_scan_get_channel_time(request->interval, + request->wpan_phy->symbol_duration); + ieee802154_queue_delayed_work(&local->hw, &local->beacons_work, 0); + + return 0; +} + +int mac802154_stop_beacons_locked(struct ieee802154_local *local) +{ + lockdep_assert_held(&local->beacons_lock); + + if (!local->ongoing_beacons_request) + return -ESRCH; + + local->ongoing_beacons_request = false; + cancel_delayed_work(&local->beacons_work); + + return 0; +} + +static int mac802154_scan_send_beacon_locked(struct ieee802154_local *local, + struct wpan_dev *wpan_dev) +{ + struct sk_buff *skb; + int ret; + + lockdep_assert_held(&local->beacons_lock); + + /* Update the sequence number */ + local->beacon.mhr.seq = atomic_inc_return(&wpan_dev->bsn); + + skb = alloc_skb(IEEE802154_BEACON_SKB_SZ, GFP_KERNEL); + if (!skb) + return -ENOBUFS; + + ret = ieee802154_beacon_push(skb, &local->beacon); + if (ret) { + kfree_skb(skb); + return ret; + } + + return drv_xmit_async(local, skb); +} + void mac802154_scan_work(struct work_struct *work) { struct ieee802154_local *local = @@ -205,6 +292,38 @@ int mac802154_trigger_scan_locked(struct ieee802154_sub_if_data *sdata, return 0; } +void mac802154_beacons_work(struct work_struct *work) +{ + struct ieee802154_local *local = + container_of(work, struct ieee802154_local, beacons_work.work); + struct ieee802154_sub_if_data *sdata; + struct wpan_dev *wpan_dev; + int ret; + + mutex_lock(&local->beacons_lock); + + if (!local->ongoing_beacons_request) + goto unlock_mutex; + + if (local->suspended) + goto queue_work; + + sdata = rcu_dereference_protected(local->beacons_sdata, + lockdep_is_held(&local->beacons_lock)); + wpan_dev = &sdata->wpan_dev; + + ret = mac802154_scan_send_beacon_locked(local, wpan_dev); + if (ret) + pr_err("Error when transmitting beacon (%d)\n", ret); + +queue_work: + ieee802154_queue_delayed_work(&local->hw, &local->beacons_work, + local->beacons_interval); + +unlock_mutex: + mutex_unlock(&local->beacons_lock); +} + int mac802154_scan_process_beacon(struct ieee802154_local *local, struct sk_buff *skb) {

[wpan-next,v2,21/27] net: mac802154: Handle beacons requests

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