From patchwork Fri Jul 1 14:30:46 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Miquel Raynal X-Patchwork-Id: 12903451 Return-Path: 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 BCC5DC43334 for ; Fri, 1 Jul 2022 14:36:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232479AbiGAOgk (ORCPT ); Fri, 1 Jul 2022 10:36:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51664 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232543AbiGAOfs (ORCPT ); Fri, 1 Jul 2022 10:35:48 -0400 Received: from relay9-d.mail.gandi.net (relay9-d.mail.gandi.net [217.70.183.199]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 928A071263; Fri, 1 Jul 2022 07:31:24 -0700 (PDT) Received: (Authenticated sender: miquel.raynal@bootlin.com) by mail.gandi.net (Postfix) with ESMTPSA id D1719FF80F; Fri, 1 Jul 2022 14:31:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1656685883; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=ZF5emM9qXS5hnATkCC3lefgrlpraWYGAGXQArQJiruA=; b=T6RWaa4R/FQDvMj8s0lerQ8N8SK/CdsTJCtqkpu+iZn1LsoNc2HA3MNirqCfHYlZYbRX+a S9fmM6dIbRAe8RIlw46rGKp6oll4GfKWz31MuTW/Jt4NHW3GgNxkRku/RfCd0ff7Di+UXd DVmYUmQ7waXmton5qz6cjnV3++WYLQSjINrTc5gKx3f4r/c446FUOqh5i/hA/xssw8sJP2 lP1AKoi7ZXdMF6NnPsJirU+1lHtmaipXmj1rW8bTcw/Q2zXGwzSR4OBNKDBxfH9LGWEDZ6 jftBaYfEaDrebj2ibuGhbm/kiM3ZgRpPKQluFSFyDywKIXHdj38yJYSxpO44wQ== From: Miquel Raynal To: Alexander Aring , Stefan Schmidt , linux-wpan@vger.kernel.org Cc: "David S. Miller" , Jakub Kicinski , Paolo Abeni , Eric Dumazet , netdev@vger.kernel.org, David Girault , Romuald Despres , Frederic Blain , Nicolas Schodet , Thomas Petazzoni , Miquel Raynal Subject: [PATCH wpan-next 14/20] net: mac802154: Handle active scanning Date: Fri, 1 Jul 2022 16:30:46 +0200 Message-Id: <20220701143052.1267509-15-miquel.raynal@bootlin.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220701143052.1267509-1-miquel.raynal@bootlin.com> References: <20220701143052.1267509-1-miquel.raynal@bootlin.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-wpan@vger.kernel.org Active scan support is based on the current passive scan support, cheered up with beacon requests sent after every channel change. Co-developed-by: David Girault Signed-off-by: David Girault Signed-off-by: Miquel Raynal --- include/net/ieee802154_netdev.h | 18 ++++++++++- net/ieee802154/header_ops.c | 27 ++++++++++++++++ net/mac802154/ieee802154_i.h | 1 + net/mac802154/scan.c | 56 +++++++++++++++++++++++++++++++-- 4 files changed, 99 insertions(+), 3 deletions(-) diff --git a/include/net/ieee802154_netdev.h b/include/net/ieee802154_netdev.h index f7716aeec93b..21e7e3f66c82 100644 --- a/include/net/ieee802154_netdev.h +++ b/include/net/ieee802154_netdev.h @@ -58,6 +58,10 @@ struct ieee802154_beacon_hdr { #endif } __packed; +struct ieee802154_mac_cmd_pl { + u8 cmd_id; +} __packed; + struct ieee802154_sechdr { #if defined(__LITTLE_ENDIAN_BITFIELD) u8 level:3, @@ -144,6 +148,16 @@ struct ieee802154_beacon_frame { struct ieee802154_beacon_hdr mac_pl; }; +struct ieee802154_mac_cmd_frame { + struct ieee802154_hdr mhr; + struct ieee802154_mac_cmd_pl mac_pl; +}; + +struct ieee802154_beacon_req_frame { + struct ieee802154_hdr mhr; + struct ieee802154_mac_cmd_pl 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 @@ -169,9 +183,11 @@ 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 */ +/* pushes/pulls various frame types into/from an skb */ int ieee802154_beacon_push(struct sk_buff *skb, struct ieee802154_beacon_frame *beacon); +int ieee802154_mac_cmd_push(struct sk_buff *skb, void *frame, + const void *pl, unsigned int pl_len); int ieee802154_max_payload(const struct ieee802154_hdr *hdr); diff --git a/net/ieee802154/header_ops.c b/net/ieee802154/header_ops.c index bab710aa36f9..795d46c7292d 100644 --- a/net/ieee802154/header_ops.c +++ b/net/ieee802154/header_ops.c @@ -121,6 +121,33 @@ ieee802154_hdr_push(struct sk_buff *skb, struct ieee802154_hdr *hdr) } EXPORT_SYMBOL_GPL(ieee802154_hdr_push); +int ieee802154_mac_cmd_push(struct sk_buff *skb, void *f, + const void *pl, unsigned int pl_len) +{ + struct ieee802154_mac_cmd_frame *frame = f; + struct ieee802154_mac_cmd_pl *mac_pl = &frame->mac_pl; + struct ieee802154_hdr *mhr = &frame->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)); + skb_put_data(skb, pl, pl_len); + + crc = crc_ccitt(0, skb->data, skb->len); + put_unaligned_le16(crc, skb_put(skb, 2)); + + return 0; +} +EXPORT_SYMBOL_GPL(ieee802154_mac_cmd_push); + int ieee802154_beacon_push(struct sk_buff *skb, struct ieee802154_beacon_frame *beacon) { diff --git a/net/mac802154/ieee802154_i.h b/net/mac802154/ieee802154_i.h index f70848b60469..86a384942e6f 100644 --- a/net/mac802154/ieee802154_i.h +++ b/net/mac802154/ieee802154_i.h @@ -58,6 +58,7 @@ struct ieee802154_local { /* Scanning */ struct mutex scan_lock; int scan_channel_idx; + struct ieee802154_beacon_req_frame scan_beacon_req; struct cfg802154_scan_request __rcu *scan_req; struct delayed_work scan_work; diff --git a/net/mac802154/scan.c b/net/mac802154/scan.c index 3dd11ec86d06..b9bb784bf388 100644 --- a/net/mac802154/scan.c +++ b/net/mac802154/scan.c @@ -18,10 +18,15 @@ #define IEEE802154_BEACON_MHR_SZ 13 #define IEEE802154_BEACON_PL_SZ 4 +#define IEEE802154_MAC_CMD_MHR_SZ 7 +#define IEEE802154_MAC_CMD_PL_SZ 1 #define IEEE802154_CRC_SZ 2 #define IEEE802154_BEACON_SKB_SZ (IEEE802154_BEACON_MHR_SZ + \ IEEE802154_BEACON_PL_SZ + \ IEEE802154_CRC_SZ) +#define IEEE802154_MAC_CMD_SKB_SZ (IEEE802154_MAC_CMD_MHR_SZ + \ + IEEE802154_MAC_CMD_PL_SZ + \ + IEEE802154_CRC_SZ) static bool mac802154_check_promiscuous(struct ieee802154_local *local) { @@ -128,6 +133,44 @@ void mac802154_flush_queued_beacons(struct ieee802154_local *local) } } +static int mac802154_scan_prepare_beacon_req(struct ieee802154_local *local) +{ + memset(&local->scan_beacon_req, 0, sizeof(local->scan_beacon_req)); + local->scan_beacon_req.mhr.fc.type = IEEE802154_FC_TYPE_MAC_CMD; + local->scan_beacon_req.mhr.fc.dest_addr_mode = IEEE802154_SHORT_ADDRESSING; + local->scan_beacon_req.mhr.fc.version = IEEE802154_2003_STD; + local->scan_beacon_req.mhr.fc.source_addr_mode = IEEE802154_NO_ADDRESSING; + local->scan_beacon_req.mhr.dest.mode = IEEE802154_ADDR_SHORT; + local->scan_beacon_req.mhr.dest.pan_id = cpu_to_le16(IEEE802154_PANID_BROADCAST); + local->scan_beacon_req.mhr.dest.short_addr = cpu_to_le16(IEEE802154_ADDR_BROADCAST); + local->scan_beacon_req.mac_pl.cmd_id = IEEE802154_CMD_BEACON_REQ; + + return 0; +} + +static int mac802154_transmit_beacon_req_locked(struct ieee802154_local *local, + struct ieee802154_sub_if_data *sdata) +{ + struct sk_buff *skb; + int ret; + + lockdep_assert_held(&local->scan_lock); + + skb = alloc_skb(IEEE802154_MAC_CMD_SKB_SZ, GFP_KERNEL); + if (!skb) + return -ENOBUFS; + + skb->dev = sdata->dev; + + ret = ieee802154_mac_cmd_push(skb, &local->scan_beacon_req, NULL, 0); + if (ret) { + kfree_skb(skb); + return ret; + } + + return ieee802154_mlme_tx(local, sdata, skb); +} + void mac802154_scan_worker(struct work_struct *work) { struct ieee802154_local *local = @@ -173,6 +216,12 @@ void mac802154_scan_worker(struct work_struct *work) mac802154_flush_queued_beacons(local); } while (ret); + if (scan_req->type == NL802154_SCAN_ACTIVE) { + ret = mac802154_transmit_beacon_req_locked(local, sdata); + if (ret) + pr_err("Error when transmitting beacon request (%d)\n", ret); + } + queue_work: scan_duration = mac802154_scan_get_channel_time(scan_req->duration, local->phy->symbol_duration); @@ -195,13 +244,16 @@ int mac802154_trigger_scan_locked(struct ieee802154_sub_if_data *sdata, if (mac802154_is_scanning(local)) return -EBUSY; - /* TODO: support other scanning type */ - if (request->type != NL802154_SCAN_PASSIVE) + if (request->type != NL802154_SCAN_PASSIVE && + request->type != NL802154_SCAN_ACTIVE) return -EOPNOTSUPP; /* Store scanning parameters */ rcu_assign_pointer(local->scan_req, request); + if (request->type == NL802154_SCAN_ACTIVE) + mac802154_scan_prepare_beacon_req(local); + /* Software scanning requires to set promiscuous mode, so we need to * pause the Tx queue during the entire operation. */