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[35.195.168.105]) by smtp.gmail.com with ESMTPSA id az16sm2797448wmb.15.2022.02.01.12.10.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 01 Feb 2022 12:10:36 -0800 (PST) From: Radoslaw Biernacki To: linux-bluetooth , Luiz Augusto von Dentz , Marcel Holtmann Cc: CrosBT Upstreaming , Archie Pusaka , Miao-chen Chou , Jakub Kicinski , Johan Hedberg , linux-kernel@vger.kernel.org, netdev@vger.kernel.org, upstream@semihalf.com, Radoslaw Biernacki , Angela Czubak , Marek Maslanka Subject: [PATCH v3 2/2] Bluetooth: Improve skb handling in mgmt_device_connected() Date: Tue, 1 Feb 2022 20:10:33 +0000 Message-Id: <20220201201033.1332733-3-rad@semihalf.com> X-Mailer: git-send-email 2.35.0.rc2.247.g8bbb082509-goog In-Reply-To: <20220201201033.1332733-1-rad@semihalf.com> References: <20220201201033.1332733-1-rad@semihalf.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org This patch introduce eir_skb_put_data() that can be used to simplify operations on eir in goal of eliminating the necessity of intermediary buffers. eir_skb_put_data() is in pair to what eir_append_data() does with help of eir_len, but without awkwardness when passing return value to skb_put() (as it returns updated offset not size). Signed-off-by: Radoslaw Biernacki --- net/bluetooth/eir.h | 15 +++++++++++++++ net/bluetooth/mgmt.c | 25 ++++++++----------------- 2 files changed, 23 insertions(+), 17 deletions(-) diff --git a/net/bluetooth/eir.h b/net/bluetooth/eir.h index e5876751f07e..43f1945bffc5 100644 --- a/net/bluetooth/eir.h +++ b/net/bluetooth/eir.h @@ -41,6 +41,21 @@ static inline u16 eir_append_le16(u8 *eir, u16 eir_len, u8 type, u16 data) return eir_len; } +static inline u16 eir_skb_put_data(struct sk_buff *skb, u8 type, u8 *data, u8 data_len) +{ + u8 *eir; + u16 eir_len; + + eir_len = eir_precalc_len(data_len); + eir = skb_put(skb, eir_len); + WARN_ON(sizeof(type) + data_len > U8_MAX); + eir[0] = sizeof(type) + data_len; + eir[1] = type; + memcpy(&eir[2], data, data_len); + + return eir_len; +} + static inline void *eir_get_data(u8 *eir, size_t eir_len, u8 type, size_t *data_len) { diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c index 43ca228104ce..4a24159f7dd6 100644 --- a/net/bluetooth/mgmt.c +++ b/net/bluetooth/mgmt.c @@ -9087,18 +9087,12 @@ void mgmt_device_connected(struct hci_dev *hdev, struct hci_conn *conn, skb_put_data(skb, conn->le_adv_data, conn->le_adv_data_len); eir_len = conn->le_adv_data_len; } else { - if (name_len > 0) { - eir_len = eir_append_data(ev->eir, 0, EIR_NAME_COMPLETE, - name, name_len); - skb_put(skb, eir_len); - } + if (name) + eir_len += eir_skb_put_data(skb, EIR_NAME_COMPLETE, name, name_len); - if (memcmp(conn->dev_class, "\0\0\0", 3) != 0) { - eir_len = eir_append_data(ev->eir, eir_len, - EIR_CLASS_OF_DEV, - conn->dev_class, 3); - skb_put(skb, 5); - } + if (memcmp(conn->dev_class, "\0\0\0", sizeof(conn->dev_class))) + eir_len += eir_skb_put_data(skb, EIR_CLASS_OF_DEV, + conn->dev_class, sizeof(conn->dev_class)); } ev->eir_len = cpu_to_le16(eir_len); @@ -9798,13 +9792,10 @@ void mgmt_remote_name(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 link_type, ev->addr.type = link_to_bdaddr(link_type, addr_type); ev->rssi = rssi; - if (name) { - eir_len = eir_append_data(ev->eir, 0, EIR_NAME_COMPLETE, name, - name_len); - skb_put(skb, eir_len); - } else { + if (name) + eir_len += eir_skb_put_data(skb, EIR_NAME_COMPLETE, name, name_len); + else flags = MGMT_DEV_FOUND_NAME_REQUEST_FAILED; - } ev->eir_len = cpu_to_le16(eir_len); ev->flags = cpu_to_le32(flags);