From patchwork Tue Jan 7 07:40:50 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Luiz Augusto von Dentz X-Patchwork-Id: 197532 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 22A8AC33C99 for ; Tue, 7 Jan 2020 07:41:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CED3B206DB for ; Tue, 7 Jan 2020 07:41:04 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="d+NmgsvJ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727578AbgAGHlE (ORCPT ); Tue, 7 Jan 2020 02:41:04 -0500 Received: from mail-pj1-f43.google.com ([209.85.216.43]:54417 "EHLO mail-pj1-f43.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727539AbgAGHlE (ORCPT ); Tue, 7 Jan 2020 02:41:04 -0500 Received: by mail-pj1-f43.google.com with SMTP id kx11so8654183pjb.4 for ; Mon, 06 Jan 2020 23:41:03 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:subject:date:message-id:in-reply-to:references:mime-version :content-transfer-encoding; bh=/FtiuNzSNY9DzNrUovYk/r2WBz0N+yP0vYuHJdhYjAc=; b=d+NmgsvJYZligzYb2ziQ38QlN7SevbfF+KF7RkQcyBMceGAmelZzoWUrMPwb5urVo7 zczDlXvbuTOnj0BRjx8C/DDL+f9/Q/IitoWxBdBarYgRM1qgF3sar1E/5ojwkYBpK3wN gmd7Z0AJNrr67nMJodNpH6eMbFstCO7x7KBGdmEcscuN4PNIYT7sfIUYiFDAp4Fu+CjU 2ZOqa0+8EmRBuZo7HaBx/CuOpGR22FzLOxRtYF/hLEcs5SwiL29dEN7Jam3ga0evdcJJ kcrXeU+mEN9Tgv/gw52qc++lJ834aoehZOl3zCYcHmSt/CL1my9OQajSVQ0HCO4BcM62 laDw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=/FtiuNzSNY9DzNrUovYk/r2WBz0N+yP0vYuHJdhYjAc=; b=Lf2wy3sJwb8Hod0Rw+yvZGQZiWjYnORXY/217HIlGuWKbEJg+n8qgmBfKwkrxPXECz Ysn8HIOjnMOibR/0EVFQoVjqW9aRblB+aKp4Ag31Sj6Lv/cYZlkO4up+Kf4bthueHBdR eE7DRBKcqmbuvCEP3ySweaf34b9nrcoPaBDM032cczz861PTT1hIOaFk+dItiDscs31g co13n1RSYL1/p5/CwxEWhyiF7uiXSjM0pxNHPV4ATizy7EOObHNemixOsIXHmvLLpb+e IrptH2v8a1Gpp2dyxEoQ6XUEXaspGdHLTaut4DVIfoMxpvDhA9ZVJDrbFN41NVMdJ8gx Bqfg== X-Gm-Message-State: APjAAAUqfCEJRvNXSBLX+lk7ZyB4MTPoHbswMrxww77rzs+/ObJvri0c wtFKg25Z5Qm+DY8h5qSBLVTuMi9vv5g= X-Google-Smtp-Source: APXvYqzwFkaEf7j3teqa2HaYinwJjxHMwOpEe4mVBd39p4VUhxmlUNQJbjjkbTvNrE4pa8bv4ZH68Q== X-Received: by 2002:a17:90a:2467:: with SMTP id h94mr47033239pje.79.1578382862532; Mon, 06 Jan 2020 23:41:02 -0800 (PST) Received: from vudentzs-t460s.hsd1.or.comcast.net ([2601:1c0:6800:1640::3287]) by smtp.gmail.com with ESMTPSA id k21sm67725388pfa.63.2020.01.06.23.41.01 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 06 Jan 2020 23:41:01 -0800 (PST) From: Luiz Augusto von Dentz To: linux-bluetooth@vger.kernel.org Subject: [PATCH 04/10] Bluetooth: L2CAP: Add initial code for Enhanced Credit Based Mode Date: Mon, 6 Jan 2020 23:40:50 -0800 Message-Id: <20200107074056.25453-5-luiz.dentz@gmail.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20200107074056.25453-1-luiz.dentz@gmail.com> References: <20200107074056.25453-1-luiz.dentz@gmail.com> MIME-Version: 1.0 Sender: linux-bluetooth-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org From: Luiz Augusto von Dentz This adds the initial code for Enhanced Credit Based Mode which introduces a new socket mode called L2CAP_MODE_ECRED, which for the most part work the same as L2CAP_MODE_LE_FLOWCTL but uses different PDUs to setup the connections and also works over BR/EDR. Signed-off-by: Luiz Augusto von Dentz --- include/net/bluetooth/l2cap.h | 3 + net/bluetooth/l2cap_core.c | 498 +++++++++++++++++++++++++++++++++- net/bluetooth/l2cap_sock.c | 39 +-- 3 files changed, 508 insertions(+), 32 deletions(-) diff --git a/include/net/bluetooth/l2cap.h b/include/net/bluetooth/l2cap.h index 5646a40c793c..9da1d9c510e9 100644 --- a/include/net/bluetooth/l2cap.h +++ b/include/net/bluetooth/l2cap.h @@ -295,6 +295,8 @@ struct l2cap_conn_rsp { #define L2CAP_CR_LE_ENCRYPTION 0x0008 #define L2CAP_CR_LE_INVALID_SCID 0x0009 #define L2CAP_CR_LE_SCID_IN_USE 0X000A +#define L2CAP_CR_LE_UNACCEPT_PARAMS 0X000B +#define L2CAP_CR_LE_INVALID_PARAMS 0X000C /* connect/create channel status */ #define L2CAP_CS_NO_INFO 0x0000 @@ -977,6 +979,7 @@ struct l2cap_chan *l2cap_chan_create(void); void l2cap_chan_close(struct l2cap_chan *chan, int reason); int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid, bdaddr_t *dst, u8 dst_type); +int l2cap_chan_reconfigure(struct l2cap_chan *chan, __u16 mtu); int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len); void l2cap_chan_busy(struct l2cap_chan *chan, int busy); int l2cap_chan_check_security(struct l2cap_chan *chan, bool initiator); diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c index 1bca608e0170..9d7236255745 100644 --- a/net/bluetooth/l2cap_core.c +++ b/net/bluetooth/l2cap_core.c @@ -532,6 +532,17 @@ static void l2cap_le_flowctl_init(struct l2cap_chan *chan, u16 tx_credits) skb_queue_head_init(&chan->tx_q); } +static void l2cap_ecred_init(struct l2cap_chan *chan, u16 tx_credits) +{ + l2cap_le_flowctl_init(chan, tx_credits); + + /* L2CAP implementations shall support a minimum MPS of 64 octets */ + if (chan->mps < L2CAP_ECRED_MIN_MPS) { + chan->mps = L2CAP_ECRED_MIN_MPS; + chan->rx_credits = (chan->imtu / chan->mps) + 1; + } +} + void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) { BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, @@ -638,6 +649,7 @@ void l2cap_chan_del(struct l2cap_chan *chan, int err) break; case L2CAP_MODE_LE_FLOWCTL: + case L2CAP_MODE_ECRED: skb_queue_purge(&chan->tx_q); break; @@ -1273,7 +1285,7 @@ static void l2cap_chan_ready(struct l2cap_chan *chan) chan->conf_state = 0; __clear_chan_timer(chan); - if (chan->mode == L2CAP_MODE_LE_FLOWCTL && !chan->tx_credits) + if (chan->mode & L2CAP_MODE_ECRED_MASK && !chan->tx_credits) chan->ops->suspend(chan); chan->state = BT_CONNECTED; @@ -1306,6 +1318,31 @@ static void l2cap_le_connect(struct l2cap_chan *chan) sizeof(req), &req); } +static void l2cap_ecred_connect(struct l2cap_chan *chan) +{ + struct l2cap_conn *conn = chan->conn; + struct { + struct l2cap_ecred_conn_req req; + __le16 scid; + } __packed pdu; + + if (test_and_set_bit(FLAG_ECRED_CONN_REQ_SENT, &chan->flags)) + return; + + l2cap_ecred_init(chan, 0); + + pdu.req.psm = chan->psm; + pdu.req.mtu = cpu_to_le16(chan->imtu); + pdu.req.mps = cpu_to_le16(chan->mps); + pdu.req.credits = cpu_to_le16(chan->rx_credits); + pdu.scid = cpu_to_le16(chan->scid); + + chan->ident = l2cap_get_ident(conn); + + l2cap_send_cmd(conn, chan->ident, L2CAP_ECRED_CONN_REQ, + sizeof(pdu), &pdu); +} + static void l2cap_le_start(struct l2cap_chan *chan) { struct l2cap_conn *conn = chan->conn; @@ -1318,8 +1355,12 @@ static void l2cap_le_start(struct l2cap_chan *chan) return; } - if (chan->state == BT_CONNECT) - l2cap_le_connect(chan); + if (chan->state == BT_CONNECT) { + if (chan->mode == L2CAP_MODE_ECRED) + l2cap_ecred_connect(chan); + else + l2cap_le_connect(chan); + } } static void l2cap_start_connection(struct l2cap_chan *chan) @@ -2505,6 +2546,7 @@ int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len) switch (chan->mode) { case L2CAP_MODE_LE_FLOWCTL: + case L2CAP_MODE_ECRED: /* Check outgoing MTU */ if (len > chan->omtu) return -EMSGSIZE; @@ -3773,6 +3815,42 @@ void __l2cap_le_connect_rsp_defer(struct l2cap_chan *chan) &rsp); } +void __l2cap_ecred_conn_rsp_defer(struct l2cap_chan *chan) +{ + struct l2cap_ecred_conn_rsp rsp; + struct l2cap_conn *conn = chan->conn; + u16 ident = chan->ident; + int i = 0; + + if (!ident) { + return; + } + + BT_DBG("chan %p ident %d", chan, ident); + + rsp.mtu = cpu_to_le16(chan->imtu); + rsp.mps = cpu_to_le16(chan->mps); + rsp.credits = cpu_to_le16(chan->rx_credits); + rsp.result = cpu_to_le16(L2CAP_CR_LE_SUCCESS); + + mutex_lock(&conn->chan_lock); + + list_for_each_entry(chan, &conn->chan_l, list) { + if (chan->ident != ident) + continue; + + /* Reset ident so only one response is sent */ + chan->ident = 0; + + /* Include all channels pending with the same ident */ + rsp.dcid[i++] = cpu_to_le16(chan->scid); + } + + mutex_unlock(&conn->chan_lock); + + l2cap_send_cmd(conn, ident, L2CAP_ECRED_CONN_RSP, sizeof(rsp), &rsp); +} + void __l2cap_connect_rsp_defer(struct l2cap_chan *chan) { struct l2cap_conn_rsp rsp; @@ -5715,6 +5793,347 @@ static inline int l2cap_le_credits(struct l2cap_conn *conn, return 0; } +static inline int l2cap_ecred_conn_req(struct l2cap_conn *conn, + struct l2cap_cmd_hdr *cmd, u16 cmd_len, + u8 *data) +{ + struct l2cap_ecred_conn_req *req = (void *) data; + struct { + struct l2cap_ecred_conn_rsp rsp; + __le16 dcid[5]; + } __packed pdu; + struct l2cap_chan *chan, *pchan; + u16 credits, mtu, mps; + __le16 psm; + u8 result, len = 0; + int i; + bool defer = false; + + if (cmd_len < sizeof(*req)) + return -EPROTO; + + mtu = __le16_to_cpu(req->mtu); + mps = __le16_to_cpu(req->mps); + + if (mtu < L2CAP_ECRED_MIN_MTU || mps < L2CAP_ECRED_MIN_MPS) { + result = L2CAP_CR_LE_UNACCEPT_PARAMS; + goto response; + } + + psm = req->psm; + credits = 0; + + BT_DBG("psm 0x%2.2x mtu %u mps %u", __le16_to_cpu(psm), mtu, mps); + + memset(&pdu, 0, sizeof(pdu)); + + /* Check if we have socket listening on psm */ + pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src, + &conn->hcon->dst, LE_LINK); + if (!pchan) { + result = L2CAP_CR_LE_BAD_PSM; + goto response; + } + + mutex_lock(&conn->chan_lock); + l2cap_chan_lock(pchan); + + if (!smp_sufficient_security(conn->hcon, pchan->sec_level, + SMP_ALLOW_STK)) { + result = L2CAP_CR_LE_AUTHENTICATION; + goto unlock; + } + + result = L2CAP_CR_LE_SUCCESS; + + for (i = 0, cmd_len -= sizeof(req); cmd_len >= sizeof(u16); + i++, cmd_len -= sizeof(u16)) { + u16 scid = __le16_to_cpu(req->scid[i]); + + BT_DBG("scid[%d] 0x%4.4x", i, scid); + + pdu.dcid[i] = 0x0000; + len += sizeof(*pdu.dcid); + + /* Check for valid dynamic CID range */ + if (scid < L2CAP_CID_DYN_START || scid > L2CAP_CID_LE_DYN_END) { + result = L2CAP_CR_LE_INVALID_SCID; + continue; + } + + /* Check if we already have channel with that dcid */ + if (__l2cap_get_chan_by_dcid(conn, scid)) { + result = L2CAP_CR_LE_SCID_IN_USE; + continue; + } + + chan = pchan->ops->new_connection(pchan); + if (!chan) { + result = L2CAP_CR_LE_NO_MEM; + continue; + } + + bacpy(&chan->src, &conn->hcon->src); + bacpy(&chan->dst, &conn->hcon->dst); + chan->src_type = bdaddr_src_type(conn->hcon); + chan->dst_type = bdaddr_dst_type(conn->hcon); + chan->psm = psm; + chan->dcid = scid; + chan->omtu = mtu; + chan->remote_mps = mps; + + __l2cap_chan_add(conn, chan); + + l2cap_ecred_init(chan, __le16_to_cpu(req->credits)); + + /* Init response */ + if (!pdu.rsp.credits) { + pdu.rsp.mtu = cpu_to_le16(chan->imtu); + pdu.rsp.mps = cpu_to_le16(chan->mps); + pdu.rsp.credits = cpu_to_le16(chan->rx_credits); + } + + pdu.dcid[i] = cpu_to_le16(chan->scid); + + __set_chan_timer(chan, chan->ops->get_sndtimeo(chan)); + + chan->ident = cmd->ident; + + if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) { + l2cap_state_change(chan, BT_CONNECT2); + defer = true; + chan->ops->defer(chan); + } else { + l2cap_chan_ready(chan); + } + } + +unlock: + l2cap_chan_unlock(pchan); + mutex_unlock(&conn->chan_lock); + l2cap_chan_put(pchan); + +response: + pdu.rsp.result = cpu_to_le16(result); + + if (defer) + return 0; + + l2cap_send_cmd(conn, cmd->ident, L2CAP_ECRED_CONN_RSP, + sizeof(pdu.rsp) + len, &pdu); + + return 0; +} + +static inline int l2cap_ecred_conn_rsp(struct l2cap_conn *conn, + struct l2cap_cmd_hdr *cmd, u16 cmd_len, + u8 *data) +{ + struct l2cap_ecred_conn_rsp *rsp = (void *) data; + struct hci_conn *hcon = conn->hcon; + u16 mtu, mps, credits, result; + struct l2cap_chan *chan; + int err = 0, sec_level; + int i = 0; + + if (cmd_len < sizeof(*rsp)) + return -EPROTO; + + mtu = __le16_to_cpu(rsp->mtu); + mps = __le16_to_cpu(rsp->mps); + credits = __le16_to_cpu(rsp->credits); + result = __le16_to_cpu(rsp->result); + + BT_DBG("mtu %u mps %u credits %u result 0x%4.4x", mtu, mps, credits, + result); + + mutex_lock(&conn->chan_lock); + + cmd_len -= sizeof(*rsp); + + list_for_each_entry(chan, &conn->chan_l, list) { + u16 dcid; + + if (chan->ident != cmd->ident || + chan->mode != L2CAP_MODE_ECRED || + chan->state == BT_CONNECTED) + continue; + + l2cap_chan_lock(chan); + + /* Check that there is a dcid for each pending channel */ + if (cmd_len < sizeof(dcid)) { + l2cap_chan_del(chan, ECONNREFUSED); + l2cap_chan_unlock(chan); + continue; + } + + dcid = __le16_to_cpu(rsp->dcid[i++]); + cmd_len -= sizeof(u16); + + BT_DBG("dcid[%d] 0x%4.4x", i, dcid); + + /* Check if dcid is already in use */ + if (dcid && __l2cap_get_chan_by_dcid(conn, dcid)) { + /* If a device receives a + * L2CAP_CREDIT_BASED_CONNECTION_RSP packet with an + * already-assigned Destination CID, then both the + * original channel and the new channel shall be + * immediately discarded and not used. + */ + l2cap_chan_del(chan, ECONNREFUSED); + l2cap_chan_unlock(chan); + chan = __l2cap_get_chan_by_dcid(conn, dcid); + l2cap_chan_lock(chan); + l2cap_chan_del(chan, ECONNRESET); + l2cap_chan_unlock(chan); + continue; + } + + switch (result) { + case L2CAP_CR_LE_AUTHENTICATION: + case L2CAP_CR_LE_ENCRYPTION: + /* If we already have MITM protection we can't do + * anything. + */ + if (hcon->sec_level > BT_SECURITY_MEDIUM) { + l2cap_chan_del(chan, ECONNREFUSED); + break; + } + + sec_level = hcon->sec_level + 1; + if (chan->sec_level < sec_level) + chan->sec_level = sec_level; + + /* We'll need to send a new Connect Request */ + clear_bit(FLAG_ECRED_CONN_REQ_SENT, &chan->flags); + + smp_conn_security(hcon, chan->sec_level); + break; + + case L2CAP_CR_LE_BAD_PSM: + l2cap_chan_del(chan, ECONNREFUSED); + break; + + default: + /* If dcid was not set it means channels was refused */ + if (!dcid) { + l2cap_chan_del(chan, ECONNREFUSED); + break; + } + + chan->ident = 0; + chan->dcid = dcid; + chan->omtu = mtu; + chan->remote_mps = mps; + chan->tx_credits = credits; + l2cap_chan_ready(chan); + break; + } + + l2cap_chan_unlock(chan); + } + + mutex_unlock(&conn->chan_lock); + + return err; +} + +static inline int l2cap_ecred_reconf_req(struct l2cap_conn *conn, + struct l2cap_cmd_hdr *cmd, u16 cmd_len, + u8 *data) +{ + struct l2cap_ecred_reconf_req *req = (void *) data; + struct l2cap_ecred_reconf_rsp rsp; + u16 mtu, mps, result; + struct l2cap_chan *chan; + int i; + + if (cmd_len < sizeof(*req)) { + result = L2CAP_CR_LE_INVALID_PARAMS; + goto respond; + } + + mtu = __le16_to_cpu(req->mtu); + mps = __le16_to_cpu(req->mps); + + BT_DBG("mtu %u mps %u", mtu, mps); + + if (mtu < L2CAP_ECRED_MIN_MTU) { + result = L2CAP_RECONF_INVALID_MTU; + goto respond; + } + + if (mps < L2CAP_ECRED_MIN_MPS) { + result = L2CAP_RECONF_INVALID_MPS; + goto respond; + } + + result = L2CAP_RECONF_SUCCESS; + + for (i = 0, cmd_len -= sizeof(*req); cmd_len < sizeof(u16); + i++, cmd_len -= sizeof(u16)) { + u16 scid; + + scid = __le16_to_cpu(req->scid[i]); + if (!scid) + return -EPROTO; + + chan = __l2cap_get_chan_by_dcid(conn, scid); + if (!chan) + continue; + + /* If the MTU value is decreased for any of the included + * channels, then the receiver shall disconnect all + * included channels. + */ + if (chan->omtu > mtu) { + BT_ERR("chan %p decreased MTU %u -> %u", chan, + chan->omtu, mtu); + result = L2CAP_RECONF_INVALID_MTU; + } + + chan->omtu = mtu; + chan->remote_mps = mps; + } + +respond: + rsp.result = cpu_to_le16(result); + + l2cap_send_cmd(conn, cmd->ident, L2CAP_ECRED_RECONF_RSP, sizeof(rsp), + &rsp); + + return 0; +} + +static inline int l2cap_ecred_reconf_rsp(struct l2cap_conn *conn, + struct l2cap_cmd_hdr *cmd, u16 cmd_len, + u8 *data) +{ + struct l2cap_chan *chan; + struct l2cap_ecred_conn_rsp *rsp = (void *) data; + u16 result; + + if (cmd_len < sizeof(*rsp)) + return -EPROTO; + + result = __le16_to_cpu(rsp->result); + + BT_DBG("result 0x%4.4x", rsp->result); + + if (!result) + return 0; + + list_for_each_entry(chan, &conn->chan_l, list) { + if (chan->ident != cmd->ident) + continue; + + l2cap_chan_del(chan, ECONNRESET); + } + + return 0; +} + static inline int l2cap_le_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) @@ -5770,6 +6189,22 @@ static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, err = l2cap_le_credits(conn, cmd, cmd_len, data); break; + case L2CAP_ECRED_CONN_REQ: + err = l2cap_ecred_conn_req(conn, cmd, cmd_len, data); + break; + + case L2CAP_ECRED_CONN_RSP: + err = l2cap_ecred_conn_rsp(conn, cmd, cmd_len, data); + break; + + case L2CAP_ECRED_RECONF_REQ: + err = l2cap_ecred_reconf_req(conn, cmd, cmd_len, data); + break; + + case L2CAP_ECRED_RECONF_RSP: + err = l2cap_ecred_reconf_rsp(conn, cmd, cmd_len, data); + break; + case L2CAP_DISCONN_REQ: err = l2cap_disconnect_req(conn, cmd, cmd_len, data); break; @@ -6815,11 +7250,13 @@ static void l2cap_chan_le_send_credits(struct l2cap_chan *chan) struct l2cap_le_credits pkt; u16 return_credits; - return_credits = ((chan->imtu / chan->mps) + 1) - chan->rx_credits; + return_credits = (chan->imtu / chan->mps) + 1; - if (!return_credits) + if (chan->rx_credits >= return_credits) return; + return_credits -= chan->rx_credits; + BT_DBG("chan %p returning %u credits to sender", chan, return_credits); chan->rx_credits += return_credits; @@ -6832,7 +7269,7 @@ static void l2cap_chan_le_send_credits(struct l2cap_chan *chan) l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CREDITS, sizeof(pkt), &pkt); } -static int l2cap_le_recv(struct l2cap_chan *chan, struct sk_buff *skb) +static int l2cap_ecred_recv(struct l2cap_chan *chan, struct sk_buff *skb) { int err; @@ -6847,7 +7284,7 @@ static int l2cap_le_recv(struct l2cap_chan *chan, struct sk_buff *skb) return err; } -static int l2cap_le_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) +static int l2cap_ecred_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) { int err; @@ -6895,7 +7332,7 @@ static int l2cap_le_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) } if (skb->len == sdu_len) - return l2cap_le_recv(chan, skb); + return l2cap_ecred_recv(chan, skb); chan->sdu = skb; chan->sdu_len = sdu_len; @@ -6927,7 +7364,7 @@ static int l2cap_le_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) skb = NULL; if (chan->sdu->len == chan->sdu_len) { - err = l2cap_le_recv(chan, chan->sdu); + err = l2cap_ecred_recv(chan, chan->sdu); if (!err) { chan->sdu = NULL; chan->sdu_last_frag = NULL; @@ -6988,7 +7425,8 @@ static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid, switch (chan->mode) { case L2CAP_MODE_LE_FLOWCTL: - if (l2cap_le_data_rcv(chan, skb) < 0) + case L2CAP_MODE_ECRED: + if (l2cap_ecred_data_rcv(chan, skb) < 0) goto drop; goto done; @@ -7215,8 +7653,8 @@ int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid, struct hci_dev *hdev; int err; - BT_DBG("%pMR -> %pMR (type %u) psm 0x%2.2x", &chan->src, dst, - dst_type, __le16_to_cpu(psm)); + BT_DBG("%pMR -> %pMR (type %u) psm 0x%4.4x mode 0x%2.2x", &chan->src, + dst, dst_type, __le16_to_cpu(psm), chan->mode); hdev = hci_get_route(dst, &chan->src, chan->src_type); if (!hdev) @@ -7245,6 +7683,8 @@ int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid, break; case L2CAP_MODE_LE_FLOWCTL: break; + case L2CAP_MODE_ECRED: + break; case L2CAP_MODE_ERTM: case L2CAP_MODE_STREAMING: if (!disable_ertm) @@ -7369,6 +7809,38 @@ int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid, } EXPORT_SYMBOL_GPL(l2cap_chan_connect); +static void l2cap_ecred_reconfigure(struct l2cap_chan *chan) +{ + struct l2cap_conn *conn = chan->conn; + struct { + struct l2cap_ecred_reconf_req req; + __le16 scid; + } pdu; + + pdu.req.mtu = cpu_to_le16(chan->imtu); + pdu.req.mps = cpu_to_le16(chan->mps); + pdu.scid = cpu_to_le16(chan->scid); + + chan->ident = l2cap_get_ident(conn); + + l2cap_send_cmd(conn, chan->ident, L2CAP_ECRED_RECONF_REQ, + sizeof(pdu), &pdu); +} + +int l2cap_chan_reconfigure(struct l2cap_chan *chan, __u16 mtu) +{ + if (chan->imtu > mtu) + return -EINVAL; + + BT_DBG("chan %p mtu 0x%4.4x", chan, mtu); + + chan->imtu = mtu; + + l2cap_ecred_reconfigure(chan); + + return 0; +} + /* ---- L2CAP interface with lower layer (HCI) ---- */ int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr) @@ -7580,7 +8052,7 @@ static void l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) else __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); } else if (chan->state == BT_CONNECT2 && - chan->mode != L2CAP_MODE_LE_FLOWCTL) { + !(chan->mode & L2CAP_MODE_ECRED_MASK)) { struct l2cap_conn_rsp rsp; __u16 res, stat; diff --git a/net/bluetooth/l2cap_sock.c b/net/bluetooth/l2cap_sock.c index a7be8b59b3c2..adb323d17a64 100644 --- a/net/bluetooth/l2cap_sock.c +++ b/net/bluetooth/l2cap_sock.c @@ -232,7 +232,7 @@ static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr, return -EINVAL; } - if (chan->psm && bdaddr_type_is_le(chan->src_type)) + if (chan->psm && bdaddr_type_is_le(chan->src_type) && !chan->mode) chan->mode = L2CAP_MODE_LE_FLOWCTL; err = l2cap_chan_connect(chan, la.l2_psm, __le16_to_cpu(la.l2_cid), @@ -273,6 +273,7 @@ static int l2cap_sock_listen(struct socket *sock, int backlog) switch (chan->mode) { case L2CAP_MODE_BASIC: case L2CAP_MODE_LE_FLOWCTL: + case L2CAP_MODE_ECRED: break; case L2CAP_MODE_ERTM: case L2CAP_MODE_STREAMING: @@ -408,16 +409,6 @@ static int l2cap_sock_getsockopt_old(struct socket *sock, int optname, switch (optname) { case L2CAP_OPTIONS: - /* LE sockets should use BT_SNDMTU/BT_RCVMTU, but since - * legacy ATT code depends on getsockopt for - * L2CAP_OPTIONS we need to let this pass. - */ - if (bdaddr_type_is_le(chan->src_type) && - chan->scid != L2CAP_CID_ATT) { - err = -EINVAL; - break; - } - memset(&opts, 0, sizeof(opts)); opts.imtu = chan->imtu; opts.omtu = chan->omtu; @@ -427,6 +418,8 @@ static int l2cap_sock_getsockopt_old(struct socket *sock, int optname, opts.max_tx = chan->max_tx; opts.txwin_size = chan->tx_win; + BT_DBG("mode 0x%2.2x", chan->mode); + len = min_t(unsigned int, len, sizeof(opts)); if (copy_to_user(optval, (char *) &opts, len)) err = -EFAULT; @@ -643,11 +636,6 @@ static int l2cap_sock_setsockopt_old(struct socket *sock, int optname, switch (optname) { case L2CAP_OPTIONS: - if (bdaddr_type_is_le(chan->src_type)) { - err = -EINVAL; - break; - } - if (sk->sk_state == BT_CONNECTED) { err = -EINVAL; break; @@ -680,6 +668,7 @@ static int l2cap_sock_setsockopt_old(struct socket *sock, int optname, chan->mode = opts.mode; switch (chan->mode) { case L2CAP_MODE_LE_FLOWCTL: + case L2CAP_MODE_ECRED: break; case L2CAP_MODE_BASIC: clear_bit(CONF_STATE2_DEVICE, &chan->conf_state); @@ -694,6 +683,8 @@ static int l2cap_sock_setsockopt_old(struct socket *sock, int optname, break; } + BT_DBG("mode 0x%2.2x", chan->mode); + chan->imtu = opts.imtu; chan->omtu = opts.omtu; chan->fcs = opts.fcs; @@ -926,7 +917,8 @@ static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname, break; } - if (sk->sk_state == BT_CONNECTED) { + if (chan->mode == L2CAP_MODE_LE_FLOWCTL && + sk->sk_state == BT_CONNECTED) { err = -EISCONN; break; } @@ -936,7 +928,12 @@ static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname, break; } - chan->imtu = opt; + if (chan->mode == L2CAP_MODE_ECRED && + sk->sk_state == BT_CONNECTED) + err = l2cap_chan_reconfigure(chan, opt); + else + chan->imtu = opt; + break; default: @@ -991,7 +988,11 @@ static int l2cap_sock_recvmsg(struct socket *sock, struct msghdr *msg, if (sk->sk_state == BT_CONNECT2 && test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) { - if (bdaddr_type_is_le(pi->chan->src_type)) { + if (pi->chan->mode == L2CAP_MODE_ECRED) { + sk->sk_state = BT_CONNECTED; + pi->chan->state = BT_CONNECTED; + __l2cap_ecred_conn_rsp_defer(pi->chan); + } if (bdaddr_type_is_le(pi->chan->src_type)) { sk->sk_state = BT_CONNECTED; pi->chan->state = BT_CONNECTED; __l2cap_le_connect_rsp_defer(pi->chan);