From: Johan Hedberg Date: Mon, 2 Dec 2013 14:02:03 +0000 (+0200) Subject: Bluetooth: Limit L2CAP_OPTIONS socket option usage with LE X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=64b4f8dc763d5c26dea0f483d6e475540eaf9759;p=linux-beck.git Bluetooth: Limit L2CAP_OPTIONS socket option usage with LE Most of the values in L2CAP_OPTIONS are not applicable for LE and those that are have different semantics. It makes therefore sense to completely block this socket option for LE and add (in a separate patch) a new socket option for tweaking the values that do make sense (mainly the send and receive MTU). Legacy user space ATT code still depends on getsockopt for L2CAP_OPTIONS though so we need to plug a hole for that for backwards compatibility. Signed-off-by: Johan Hedberg Signed-off-by: Marcel Holtmann --- diff --git a/net/bluetooth/l2cap_sock.c b/net/bluetooth/l2cap_sock.c index 61e25bafdf43..a20fcc3ddcd9 100644 --- a/net/bluetooth/l2cap_sock.c +++ b/net/bluetooth/l2cap_sock.c @@ -370,6 +370,16 @@ 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; @@ -564,6 +574,11 @@ 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;