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Bluetooth: hci_sock: Add support for BT_{SND,RCV}BUF

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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>
This commit is contained in:
Luiz Augusto von Dentz 2021-09-16 13:10:46 -07:00 • committed by Marcel Holtmann
parent 01ce70b0a2
commit 09572fca72
1 changed files with 91 additions and 11 deletions
Download patch file Download diff file Expand all files Collapse all files

102
net/bluetooth/hci_sock.c
View file

@ -57,6 +57,7 @@ struct hci_pinfo {
unsigned long flags; unsigned long flags;
__u32 cookie; __u32 cookie;
char comm[TASK_COMM_LEN]; char comm[TASK_COMM_LEN];
__u16 mtu;
}; };
static struct hci_dev *hci_hdev_from_sock(struct sock *sk) 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; 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; sk->sk_state = BT_BOUND;
done: 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)) if (flags & ~(MSG_DONTWAIT | MSG_NOSIGNAL | MSG_ERRQUEUE | MSG_CMSG_COMPAT))
return -EINVAL; return -EINVAL;
if (len < 4 || len > HCI_MAX_FRAME_SIZE) if (len < 4 || len > hci_pi(sk)->mtu)
return -EINVAL; return -EINVAL;
buf = kmalloc(len, GFP_KERNEL); buf = kmalloc(len, GFP_KERNEL);
@ -1849,8 +1854,8 @@ drop:
goto done; goto done;
} }
static int hci_sock_setsockopt(struct socket *sock, int level, int optname, static int hci_sock_setsockopt_old(struct socket *sock, int level, int optname,
sockptr_t optval, unsigned int len) sockptr_t optval, unsigned int len)
{ {
struct hci_ufilter uf = { .opcode = 0 }; struct hci_ufilter uf = { .opcode = 0 };
struct sock *sk = sock->sk; 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); BT_DBG("sk %p, opt %d", sk, optname);
if (level != SOL_HCI)
return -ENOPROTOOPT;
lock_sock(sk); lock_sock(sk);
if (hci_pi(sk)->channel != HCI_CHANNEL_RAW) { if (hci_pi(sk)->channel != HCI_CHANNEL_RAW) {
@ -1935,8 +1937,56 @@ done:
return err; return err;
} }
static int hci_sock_getsockopt(struct socket *sock, int level, int optname, static int hci_sock_setsockopt(struct socket *sock, int level, int optname,
char __user *optval, int __user *optlen) sockptr_t optval, unsigned int len)
{
struct sock *sk = sock->sk;
int err = 0, opt = 0;
BT_DBG("sk %p, opt %d", sk, optname);
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 hci_ufilter uf;
struct sock *sk = sock->sk; struct sock *sk = sock->sk;
@ -1944,9 +1994,6 @@ static int hci_sock_getsockopt(struct socket *sock, int level, int optname,
BT_DBG("sk %p, opt %d", sk, optname); BT_DBG("sk %p, opt %d", sk, optname);
if (level != SOL_HCI)
return -ENOPROTOOPT;
if (get_user(len, optlen)) if (get_user(len, optlen))
return -EFAULT; return -EFAULT;
@ -2004,6 +2051,39 @@ done:
return err; 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 = { static const struct proto_ops hci_sock_ops = {
.family = PF_BLUETOOTH, .family = PF_BLUETOOTH,
.owner = THIS_MODULE, .owner = THIS_MODULE,