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[71.56.157.77]) by smtp.gmail.com with ESMTPSA id 141sm799312pgf.46.2021.09.15.13.28.56 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 15 Sep 2021 13:28:57 -0700 (PDT) From: Luiz Augusto von Dentz To: linux-bluetooth@vger.kernel.org Subject: [PATCH v2 1/2] Bluetooth: hci_sock: Replace use of memcpy_from_msg with bt_skb_sendmsg Date: Wed, 15 Sep 2021 13:28:55 -0700 Message-Id: <20210915202856.4030398-1-luiz.dentz@gmail.com> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org From: Luiz Augusto von Dentz This makes use of bt_skb_sendmsg instead of allocating a different buffer to be used with memcpy_from_msg which cause one extra copy. Signed-off-by: Luiz Augusto von Dentz --- net/bluetooth/hci_sock.c | 100 +++++++++++++++------------------------ 1 file changed, 37 insertions(+), 63 deletions(-) diff --git a/net/bluetooth/hci_sock.c b/net/bluetooth/hci_sock.c index e481eee8e61e..39309ef6af4a 100644 --- a/net/bluetooth/hci_sock.c +++ b/net/bluetooth/hci_sock.c @@ -1510,7 +1510,8 @@ static int hci_sock_recvmsg(struct socket *sock, struct msghdr *msg, return err ? : copied; } -static int hci_mgmt_cmd(struct hci_mgmt_chan *chan, struct sock *sk, void *buf, size_t msglen) +static int hci_mgmt_cmd(struct hci_mgmt_chan *chan, struct sock *sk, + struct sk_buff *skb) { u8 *cp; struct mgmt_hdr *hdr; @@ -1520,31 +1521,31 @@ static int hci_mgmt_cmd(struct hci_mgmt_chan *chan, struct sock *sk, void *buf, bool var_len, no_hdev; int err; - BT_DBG("got %zu bytes", msglen); + BT_DBG("got %d bytes", skb->len); - if (msglen < sizeof(*hdr)) + if (skb->len < sizeof(*hdr)) return -EINVAL; - hdr = buf; + hdr = (void *)skb->data; opcode = __le16_to_cpu(hdr->opcode); index = __le16_to_cpu(hdr->index); len = __le16_to_cpu(hdr->len); - if (len != msglen - sizeof(*hdr)) { + if (len != skb->len - sizeof(*hdr)) { err = -EINVAL; goto done; } if (chan->channel == HCI_CHANNEL_CONTROL) { - struct sk_buff *skb; + struct sk_buff *cmd; /* Send event to monitor */ - skb = create_monitor_ctrl_command(sk, index, opcode, len, - buf + sizeof(*hdr)); - if (skb) { - hci_send_to_channel(HCI_CHANNEL_MONITOR, skb, + cmd = create_monitor_ctrl_command(sk, index, opcode, len, + skb->data + sizeof(*hdr)); + if (cmd) { + hci_send_to_channel(HCI_CHANNEL_MONITOR, cmd, HCI_SOCK_TRUSTED, NULL); - kfree_skb(skb); + kfree_skb(cmd); } } @@ -1609,13 +1610,13 @@ static int hci_mgmt_cmd(struct hci_mgmt_chan *chan, struct sock *sk, void *buf, if (hdev && chan->hdev_init) chan->hdev_init(sk, hdev); - cp = buf + sizeof(*hdr); + cp = skb->data + sizeof(*hdr); err = handler->func(sk, hdev, cp, len); if (err < 0) goto done; - err = msglen; + err = skb->len; done: if (hdev) @@ -1624,10 +1625,10 @@ static int hci_mgmt_cmd(struct hci_mgmt_chan *chan, struct sock *sk, void *buf, return err; } -static int hci_logging_frame(struct sock *sk, void *buf, int len, unsigned int flags) +static int hci_logging_frame(struct sock *sk, struct sk_buff *skb, + unsigned int flags) { struct hci_mon_hdr *hdr; - struct sk_buff *skb; struct hci_dev *hdev; u16 index; int err; @@ -1636,21 +1637,13 @@ static int hci_logging_frame(struct sock *sk, void *buf, int len, unsigned int f * the priority byte, the ident length byte and at least one string * terminator NUL byte. Anything shorter are invalid packets. */ - if (len < sizeof(*hdr) + 3) + if (skb->len < sizeof(*hdr) + 3) return -EINVAL; - skb = bt_skb_send_alloc(sk, len, flags & MSG_DONTWAIT, &err); - if (!skb) - return err; - - memcpy(skb_put(skb, len), buf, len); - hdr = (void *)skb->data; - if (__le16_to_cpu(hdr->len) != len - sizeof(*hdr)) { - err = -EINVAL; - goto drop; - } + if (__le16_to_cpu(hdr->len) != skb->len - sizeof(*hdr)) + return -EINVAL; if (__le16_to_cpu(hdr->opcode) == 0x0000) { __u8 priority = skb->data[sizeof(*hdr)]; @@ -1669,25 +1662,20 @@ static int hci_logging_frame(struct sock *sk, void *buf, int len, unsigned int f * The message follows the ident string (if present) and * must be NUL terminated. Otherwise it is not a valid packet. */ - if (priority > 7 || skb->data[len - 1] != 0x00 || - ident_len > len - sizeof(*hdr) - 3 || - skb->data[sizeof(*hdr) + ident_len + 1] != 0x00) { - err = -EINVAL; - goto drop; - } + if (priority > 7 || skb->data[skb->len - 1] != 0x00 || + ident_len > skb->len - sizeof(*hdr) - 3 || + skb->data[sizeof(*hdr) + ident_len + 1] != 0x00) + return -EINVAL; } else { - err = -EINVAL; - goto drop; + return -EINVAL; } index = __le16_to_cpu(hdr->index); if (index != MGMT_INDEX_NONE) { hdev = hci_dev_get(index); - if (!hdev) { - err = -ENODEV; - goto drop; - } + if (!hdev) + return -ENODEV; } else { hdev = NULL; } @@ -1695,13 +1683,11 @@ static int hci_logging_frame(struct sock *sk, void *buf, int len, unsigned int f hdr->opcode = cpu_to_le16(HCI_MON_USER_LOGGING); hci_send_to_channel(HCI_CHANNEL_MONITOR, skb, HCI_SOCK_TRUSTED, NULL); - err = len; + err = skb->len; if (hdev) hci_dev_put(hdev); -drop: - kfree_skb(skb); return err; } @@ -1713,7 +1699,6 @@ static int hci_sock_sendmsg(struct socket *sock, struct msghdr *msg, struct hci_dev *hdev; struct sk_buff *skb; int err; - void *buf; const unsigned int flags = msg->msg_flags; BT_DBG("sock %p sk %p", sock, sk); @@ -1727,13 +1712,9 @@ static int hci_sock_sendmsg(struct socket *sock, struct msghdr *msg, if (len < 4 || len > hci_pi(sk)->mtu) return -EINVAL; - buf = kmalloc(len, GFP_KERNEL); - if (!buf) - return -ENOMEM; - if (memcpy_from_msg(buf, msg, len)) { - kfree(buf); - return -EFAULT; - } + skb = bt_skb_sendmsg(sk, msg, len, len, 0, 0); + if (IS_ERR(skb)) + return PTR_ERR(skb); lock_sock(sk); @@ -1743,39 +1724,33 @@ static int hci_sock_sendmsg(struct socket *sock, struct msghdr *msg, break; case HCI_CHANNEL_MONITOR: err = -EOPNOTSUPP; - goto done; + goto drop; case HCI_CHANNEL_LOGGING: - err = hci_logging_frame(sk, buf, len, flags); - goto done; + err = hci_logging_frame(sk, skb, flags); + goto drop; default: mutex_lock(&mgmt_chan_list_lock); chan = __hci_mgmt_chan_find(hci_pi(sk)->channel); if (chan) - err = hci_mgmt_cmd(chan, sk, buf, len); + err = hci_mgmt_cmd(chan, sk, skb); else err = -EINVAL; mutex_unlock(&mgmt_chan_list_lock); - goto done; + goto drop; } hdev = hci_hdev_from_sock(sk); if (IS_ERR(hdev)) { err = PTR_ERR(hdev); - goto done; + goto drop; } if (!test_bit(HCI_UP, &hdev->flags)) { err = -ENETDOWN; - goto done; + goto drop; } - skb = bt_skb_send_alloc(sk, len, flags & MSG_DONTWAIT, &err); - if (!skb) - goto done; - - memcpy(skb_put(skb, len), buf, len); - hci_skb_pkt_type(skb) = skb->data[0]; skb_pull(skb, 1); @@ -1846,7 +1821,6 @@ static int hci_sock_sendmsg(struct socket *sock, struct msghdr *msg, done: release_sock(sk); - kfree(buf); return err; drop: