From: Johan Hedberg <johan.hedberg@xxxxxxxxx>
This patch adds the necessary boiler plate code to handle receiving
L2CAP connect requests over LE and respond to them with a proper connect
response.
Signed-off-by: Johan Hedberg <johan.hedberg@xxxxxxxxx>
---
include/net/bluetooth/l2cap.h | 1 +
net/bluetooth/l2cap_core.c | 150 ++++++++++++++++++++++++++++++++++++++++++
2 files changed, 151 insertions(+)
diff --git a/include/net/bluetooth/l2cap.h b/include/net/bluetooth/l2cap.h
index b9e3240edf02..b622ccc0ab64 100644
--- a/include/net/bluetooth/l2cap.h
+++ b/include/net/bluetooth/l2cap.h
@@ -846,6 +846,7 @@ int l2cap_init_sockets(void);
void l2cap_cleanup_sockets(void);
bool l2cap_is_socket(struct socket *sock);
+void __l2cap_le_connect_rsp_defer(struct l2cap_chan *chan);
void __l2cap_connect_rsp_defer(struct l2cap_chan *chan);
int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm);
diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
index 5f9287fd86df..891995f845f6 100644
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -617,6 +617,29 @@ void l2cap_chan_del(struct l2cap_chan *chan, int err)
return;
}
+static void l2cap_chan_le_connect_reject(struct l2cap_chan *chan)
+{
+ struct l2cap_conn *conn = chan->conn;
+ struct l2cap_le_conn_rsp rsp;
+ u16 result;
+
+ if (test_bit(FLAG_DEFER_SETUP, &chan->flags))
+ result = L2CAP_CR_AUTHORIZATION;
+ else
+ result = L2CAP_CR_BAD_PSM;
+
+ l2cap_state_change(chan, BT_DISCONN);
+
+ rsp.dcid = cpu_to_le16(chan->scid);
+ rsp.mtu = cpu_to_le16(chan->imtu);
+ rsp.mps = __constant_cpu_to_le16(L2CAP_LE_DEFAULT_MPS);
+ rsp.credits = __constant_cpu_to_le16(L2CAP_LE_MAX_CREDITS);
+ rsp.result = cpu_to_le16(result);
+
+ l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_RSP, sizeof(rsp),
+ &rsp);
+}
+
static void l2cap_chan_connect_reject(struct l2cap_chan *chan)
{
struct l2cap_conn *conn = chan->conn;
@@ -663,6 +686,8 @@ void l2cap_chan_close(struct l2cap_chan *chan, int reason)
if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED) {
if (conn->hcon->type == ACL_LINK)
l2cap_chan_connect_reject(chan);
+ else if (conn->hcon->type == LE_LINK)
+ l2cap_chan_le_connect_reject(chan);
}
l2cap_chan_del(chan, reason);
@@ -3641,6 +3666,23 @@ static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data,
return ptr - data;
}
+void __l2cap_le_connect_rsp_defer(struct l2cap_chan *chan)
+{
+ struct l2cap_le_conn_rsp rsp;
+ struct l2cap_conn *conn = chan->conn;
+
+ BT_DBG("chan %p", chan);
+
+ rsp.dcid = cpu_to_le16(chan->scid);
+ rsp.mtu = cpu_to_le16(chan->imtu);
+ rsp.mps = __constant_cpu_to_le16(L2CAP_LE_DEFAULT_MPS);
+ rsp.credits = __constant_cpu_to_le16(L2CAP_LE_MAX_CREDITS);
+ rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS);
+
+ l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_RSP, sizeof(rsp),
+ &rsp);
+}
+
void __l2cap_connect_rsp_defer(struct l2cap_chan *chan)
{
struct l2cap_conn_rsp rsp;
@@ -5382,6 +5424,111 @@ static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn,
return err;
}
+static int l2cap_le_connect_req(struct l2cap_conn *conn,
+ struct l2cap_cmd_hdr *cmd, u16 cmd_len,
+ u8 *data)
+{
+ struct l2cap_le_conn_req *req = (struct l2cap_le_conn_req *) data;
+ struct l2cap_le_conn_rsp rsp;
+ struct l2cap_chan *chan, *pchan;
+ u16 dcid, scid, mtu, mps;
+ __le16 psm;
+ u8 result;
+
+ if (cmd_len != sizeof(*req))
+ return -EPROTO;
+
+ scid = __le16_to_cpu(req->scid);
+ mtu = __le16_to_cpu(req->mtu);
+ mps = __le16_to_cpu(req->mps);
+ psm = req->psm;
+ dcid = 0;
+
+ if (mtu < 23 || mps < 23)
+ return -EPROTO;
+
+ BT_DBG("psm 0x%2.2x scid 0x%4.4x mtu %u mps %u", __le16_to_cpu(psm),
+ scid, mtu, mps);
+
+ /* Check if we have socket listening on psm */
+ pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src,
+ &conn->hcon->dst, LE_LINK);
+ if (!pchan) {
+ result = L2CAP_CR_BAD_PSM;
+ chan = NULL;
+ goto response;
+ }
+
+ mutex_lock(&conn->chan_lock);
+ l2cap_chan_lock(pchan);
+
+ if (!smp_sufficient_security(conn->hcon, pchan->sec_level)) {
+ result = L2CAP_CR_AUTHENTICATION;
+ goto response_unlock;
+ }
+
+ /* Check if we already have channel with that dcid */
+ if (__l2cap_get_chan_by_dcid(conn, scid)) {
+ result = L2CAP_CR_NO_MEM;
+ goto response_unlock;
+ }
+
+ chan = pchan->ops->new_connection(pchan);
+ if (!chan) {
+ result = L2CAP_CR_NO_MEM;
+ goto response_unlock;
+ }
+
+ bacpy(&chan->src, &conn->hcon->src);
+ bacpy(&chan->dst, &conn->hcon->dst);
+ chan->src_type = bdaddr_type(conn->hcon, conn->hcon->src_type);
+ chan->dst_type = bdaddr_type(conn->hcon, conn->hcon->dst_type);
+ chan->psm = psm;
+ chan->dcid = scid;
+ chan->omtu = mtu;
+ chan->remote_mps = mps;
+
+ __l2cap_chan_add(conn, chan);
+ dcid = chan->scid;
+
+ __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
+
+ chan->ident = cmd->ident;
+
+ if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
+ l2cap_state_change(chan, BT_CONNECT2);
+ result = L2CAP_CR_PEND;
+ chan->ops->defer(chan);
+ } else {
+ l2cap_chan_ready(chan);
+ result = L2CAP_CR_SUCCESS;
+ }
+
+response_unlock:
+ l2cap_chan_unlock(pchan);
+ mutex_unlock(&conn->chan_lock);
+
+ if (result == L2CAP_CR_PEND)
+ return 0;
+
+response:
+ if (chan) {
+ rsp.mtu = cpu_to_le16(chan->imtu);
+ rsp.mps = __constant_cpu_to_le16(L2CAP_LE_DEFAULT_MPS);
+ } else {
+ rsp.mtu = 0;
+ rsp.mps = 0;
+ }
+
+ rsp.dcid = cpu_to_le16(dcid);
+ rsp.credits = __constant_cpu_to_le16(L2CAP_LE_MAX_CREDITS);
+ rsp.result = cpu_to_le16(result);
+
+ l2cap_send_cmd(conn, cmd->ident, L2CAP_LE_CONN_RSP, sizeof(rsp), &rsp);
+
+ return 0;
+}
+
static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn,
struct l2cap_cmd_hdr *cmd, u16 cmd_len,
u8 *data)
@@ -5400,6 +5547,9 @@ static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn,
l2cap_le_connect_rsp(conn, cmd, cmd_len, data);
return 0;
+ case L2CAP_LE_CONN_REQ:
+ return l2cap_le_connect_req(conn, cmd, cmd_len, data);
+
default:
BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code);
return -EINVAL;
--
1.8.4.2
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