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authorLuiz Augusto von Dentz <luiz.von.dentz@intel.com>2021-09-16 23:10:46 +0300
committerMarcel Holtmann <marcel@holtmann.org>2021-09-21 11:44:52 +0300
commit09572fca7223bcf32c9f0d5e100d8381a81d55f4 (patch)
tree02fd63a9eeaa5560eb057e1f76000aef89cfe9e9 /net/bluetooth/hci_sock.c
parent01ce70b0a274bd76a5a311fb90d4d446d9bdfea1 (diff)
downloadlinux-09572fca7223bcf32c9f0d5e100d8381a81d55f4.tar.xz
Bluetooth: hci_sock: Add support for BT_{SND,RCV}BUF
This adds support for BT_{SND,RCV}BUF so userspace can set MTU based on the channel usage. Fixes: https://github.com/bluez/bluez/issues/201 Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Diffstat (limited to 'net/bluetooth/hci_sock.c')
-rw-r--r--net/bluetooth/hci_sock.c102
1 files changed, 91 insertions, 11 deletions
diff --git a/net/bluetooth/hci_sock.c b/net/bluetooth/hci_sock.c
index 55b0d177375b..99de17922bda 100644
--- a/net/bluetooth/hci_sock.c
+++ b/net/bluetooth/hci_sock.c
@@ -57,6 +57,7 @@ struct hci_pinfo {
unsigned long flags;
__u32 cookie;
char comm[TASK_COMM_LEN];
+ __u16 mtu;
};
static struct hci_dev *hci_hdev_from_sock(struct sock *sk)
@@ -1374,6 +1375,10 @@ static int hci_sock_bind(struct socket *sock, struct sockaddr *addr,
break;
}
+ /* Default MTU to HCI_MAX_FRAME_SIZE if not set */
+ if (!hci_pi(sk)->mtu)
+ hci_pi(sk)->mtu = HCI_MAX_FRAME_SIZE;
+
sk->sk_state = BT_BOUND;
done:
@@ -1719,7 +1724,7 @@ static int hci_sock_sendmsg(struct socket *sock, struct msghdr *msg,
if (flags & ~(MSG_DONTWAIT | MSG_NOSIGNAL | MSG_ERRQUEUE | MSG_CMSG_COMPAT))
return -EINVAL;
- if (len < 4 || len > HCI_MAX_FRAME_SIZE)
+ if (len < 4 || len > hci_pi(sk)->mtu)
return -EINVAL;
buf = kmalloc(len, GFP_KERNEL);
@@ -1849,8 +1854,8 @@ drop:
goto done;
}
-static int hci_sock_setsockopt(struct socket *sock, int level, int optname,
- sockptr_t optval, unsigned int len)
+static int hci_sock_setsockopt_old(struct socket *sock, int level, int optname,
+ sockptr_t optval, unsigned int len)
{
struct hci_ufilter uf = { .opcode = 0 };
struct sock *sk = sock->sk;
@@ -1858,9 +1863,6 @@ static int hci_sock_setsockopt(struct socket *sock, int level, int optname,
BT_DBG("sk %p, opt %d", sk, optname);
- if (level != SOL_HCI)
- return -ENOPROTOOPT;
-
lock_sock(sk);
if (hci_pi(sk)->channel != HCI_CHANNEL_RAW) {
@@ -1935,18 +1937,63 @@ done:
return err;
}
-static int hci_sock_getsockopt(struct socket *sock, int level, int optname,
- char __user *optval, int __user *optlen)
+static int hci_sock_setsockopt(struct socket *sock, int level, int optname,
+ sockptr_t optval, unsigned int len)
{
- struct hci_ufilter uf;
struct sock *sk = sock->sk;
- int len, opt, err = 0;
+ int err = 0, opt = 0;
BT_DBG("sk %p, opt %d", sk, optname);
- if (level != SOL_HCI)
+ if (level == SOL_HCI)
+ return hci_sock_setsockopt_old(sock, level, optname, optval,
+ len);
+
+ if (level != SOL_BLUETOOTH)
return -ENOPROTOOPT;
+ lock_sock(sk);
+
+ switch (optname) {
+ case BT_SNDMTU:
+ case BT_RCVMTU:
+ switch (hci_pi(sk)->channel) {
+ /* Don't allow changing MTU for channels that are meant for HCI
+ * traffic only.
+ */
+ case HCI_CHANNEL_RAW:
+ case HCI_CHANNEL_USER:
+ err = -ENOPROTOOPT;
+ goto done;
+ }
+
+ if (copy_from_sockptr(&opt, optval, sizeof(u16))) {
+ err = -EFAULT;
+ break;
+ }
+
+ hci_pi(sk)->mtu = opt;
+ break;
+
+ default:
+ err = -ENOPROTOOPT;
+ break;
+ }
+
+done:
+ release_sock(sk);
+ return err;
+}
+
+static int hci_sock_getsockopt_old(struct socket *sock, int level, int optname,
+ char __user *optval, int __user *optlen)
+{
+ struct hci_ufilter uf;
+ struct sock *sk = sock->sk;
+ int len, opt, err = 0;
+
+ BT_DBG("sk %p, opt %d", sk, optname);
+
if (get_user(len, optlen))
return -EFAULT;
@@ -2004,6 +2051,39 @@ done:
return err;
}
+static int hci_sock_getsockopt(struct socket *sock, int level, int optname,
+ char __user *optval, int __user *optlen)
+{
+ struct sock *sk = sock->sk;
+ int err = 0;
+
+ BT_DBG("sk %p, opt %d", sk, optname);
+
+ if (level == SOL_HCI)
+ return hci_sock_getsockopt_old(sock, level, optname, optval,
+ optlen);
+
+ if (level != SOL_BLUETOOTH)
+ return -ENOPROTOOPT;
+
+ lock_sock(sk);
+
+ switch (optname) {
+ case BT_SNDMTU:
+ case BT_RCVMTU:
+ if (put_user(hci_pi(sk)->mtu, (u16 __user *)optval))
+ err = -EFAULT;
+ break;
+
+ default:
+ err = -ENOPROTOOPT;
+ break;
+ }
+
+ release_sock(sk);
+ return err;
+}
+
static const struct proto_ops hci_sock_ops = {
.family = PF_BLUETOOTH,
.owner = THIS_MODULE,