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-rw-r--r--net/bluetooth/a2mp.c568
1 files changed, 568 insertions, 0 deletions
diff --git a/net/bluetooth/a2mp.c b/net/bluetooth/a2mp.c
new file mode 100644
index 00000000000..4ff0bf3ba9a
--- /dev/null
+++ b/net/bluetooth/a2mp.c
@@ -0,0 +1,568 @@
+/*
+ Copyright (c) 2010,2011 Code Aurora Forum. All rights reserved.
+ Copyright (c) 2011,2012 Intel Corp.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License version 2 and
+ only version 2 as published by the Free Software Foundation.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+*/
+
+#include <net/bluetooth/bluetooth.h>
+#include <net/bluetooth/hci_core.h>
+#include <net/bluetooth/l2cap.h>
+#include <net/bluetooth/a2mp.h>
+
+/* A2MP build & send command helper functions */
+static struct a2mp_cmd *__a2mp_build(u8 code, u8 ident, u16 len, void *data)
+{
+ struct a2mp_cmd *cmd;
+ int plen;
+
+ plen = sizeof(*cmd) + len;
+ cmd = kzalloc(plen, GFP_KERNEL);
+ if (!cmd)
+ return NULL;
+
+ cmd->code = code;
+ cmd->ident = ident;
+ cmd->len = cpu_to_le16(len);
+
+ memcpy(cmd->data, data, len);
+
+ return cmd;
+}
+
+static void a2mp_send(struct amp_mgr *mgr, u8 code, u8 ident, u16 len,
+ void *data)
+{
+ struct l2cap_chan *chan = mgr->a2mp_chan;
+ struct a2mp_cmd *cmd;
+ u16 total_len = len + sizeof(*cmd);
+ struct kvec iv;
+ struct msghdr msg;
+
+ cmd = __a2mp_build(code, ident, len, data);
+ if (!cmd)
+ return;
+
+ iv.iov_base = cmd;
+ iv.iov_len = total_len;
+
+ memset(&msg, 0, sizeof(msg));
+
+ msg.msg_iov = (struct iovec *) &iv;
+ msg.msg_iovlen = 1;
+
+ l2cap_chan_send(chan, &msg, total_len, 0);
+
+ kfree(cmd);
+}
+
+static inline void __a2mp_cl_bredr(struct a2mp_cl *cl)
+{
+ cl->id = 0;
+ cl->type = 0;
+ cl->status = 1;
+}
+
+/* hci_dev_list shall be locked */
+static void __a2mp_add_cl(struct amp_mgr *mgr, struct a2mp_cl *cl, u8 num_ctrl)
+{
+ int i = 0;
+ struct hci_dev *hdev;
+
+ __a2mp_cl_bredr(cl);
+
+ list_for_each_entry(hdev, &hci_dev_list, list) {
+ /* Iterate through AMP controllers */
+ if (hdev->id == HCI_BREDR_ID)
+ continue;
+
+ /* Starting from second entry */
+ if (++i >= num_ctrl)
+ return;
+
+ cl[i].id = hdev->id;
+ cl[i].type = hdev->amp_type;
+ cl[i].status = hdev->amp_status;
+ }
+}
+
+/* Processing A2MP messages */
+static int a2mp_command_rej(struct amp_mgr *mgr, struct sk_buff *skb,
+ struct a2mp_cmd *hdr)
+{
+ struct a2mp_cmd_rej *rej = (void *) skb->data;
+
+ if (le16_to_cpu(hdr->len) < sizeof(*rej))
+ return -EINVAL;
+
+ BT_DBG("ident %d reason %d", hdr->ident, le16_to_cpu(rej->reason));
+
+ skb_pull(skb, sizeof(*rej));
+
+ return 0;
+}
+
+static int a2mp_discover_req(struct amp_mgr *mgr, struct sk_buff *skb,
+ struct a2mp_cmd *hdr)
+{
+ struct a2mp_discov_req *req = (void *) skb->data;
+ u16 len = le16_to_cpu(hdr->len);
+ struct a2mp_discov_rsp *rsp;
+ u16 ext_feat;
+ u8 num_ctrl;
+
+ if (len < sizeof(*req))
+ return -EINVAL;
+
+ skb_pull(skb, sizeof(*req));
+
+ ext_feat = le16_to_cpu(req->ext_feat);
+
+ BT_DBG("mtu %d efm 0x%4.4x", le16_to_cpu(req->mtu), ext_feat);
+
+ /* check that packet is not broken for now */
+ while (ext_feat & A2MP_FEAT_EXT) {
+ if (len < sizeof(ext_feat))
+ return -EINVAL;
+
+ ext_feat = get_unaligned_le16(skb->data);
+ BT_DBG("efm 0x%4.4x", ext_feat);
+ len -= sizeof(ext_feat);
+ skb_pull(skb, sizeof(ext_feat));
+ }
+
+ read_lock(&hci_dev_list_lock);
+
+ num_ctrl = __hci_num_ctrl();
+ len = num_ctrl * sizeof(struct a2mp_cl) + sizeof(*rsp);
+ rsp = kmalloc(len, GFP_ATOMIC);
+ if (!rsp) {
+ read_unlock(&hci_dev_list_lock);
+ return -ENOMEM;
+ }
+
+ rsp->mtu = __constant_cpu_to_le16(L2CAP_A2MP_DEFAULT_MTU);
+ rsp->ext_feat = 0;
+
+ __a2mp_add_cl(mgr, rsp->cl, num_ctrl);
+
+ read_unlock(&hci_dev_list_lock);
+
+ a2mp_send(mgr, A2MP_DISCOVER_RSP, hdr->ident, len, rsp);
+
+ kfree(rsp);
+ return 0;
+}
+
+static int a2mp_change_notify(struct amp_mgr *mgr, struct sk_buff *skb,
+ struct a2mp_cmd *hdr)
+{
+ struct a2mp_cl *cl = (void *) skb->data;
+
+ while (skb->len >= sizeof(*cl)) {
+ BT_DBG("Controller id %d type %d status %d", cl->id, cl->type,
+ cl->status);
+ cl = (struct a2mp_cl *) skb_pull(skb, sizeof(*cl));
+ }
+
+ /* TODO send A2MP_CHANGE_RSP */
+
+ return 0;
+}
+
+static int a2mp_getinfo_req(struct amp_mgr *mgr, struct sk_buff *skb,
+ struct a2mp_cmd *hdr)
+{
+ struct a2mp_info_req *req = (void *) skb->data;
+ struct a2mp_info_rsp rsp;
+ struct hci_dev *hdev;
+
+ if (le16_to_cpu(hdr->len) < sizeof(*req))
+ return -EINVAL;
+
+ BT_DBG("id %d", req->id);
+
+ rsp.id = req->id;
+ rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
+
+ hdev = hci_dev_get(req->id);
+ if (hdev && hdev->amp_type != HCI_BREDR) {
+ rsp.status = 0;
+ rsp.total_bw = cpu_to_le32(hdev->amp_total_bw);
+ rsp.max_bw = cpu_to_le32(hdev->amp_max_bw);
+ rsp.min_latency = cpu_to_le32(hdev->amp_min_latency);
+ rsp.pal_cap = cpu_to_le16(hdev->amp_pal_cap);
+ rsp.assoc_size = cpu_to_le16(hdev->amp_assoc_size);
+ }
+
+ if (hdev)
+ hci_dev_put(hdev);
+
+ a2mp_send(mgr, A2MP_GETINFO_RSP, hdr->ident, sizeof(rsp), &rsp);
+
+ skb_pull(skb, sizeof(*req));
+ return 0;
+}
+
+static int a2mp_getampassoc_req(struct amp_mgr *mgr, struct sk_buff *skb,
+ struct a2mp_cmd *hdr)
+{
+ struct a2mp_amp_assoc_req *req = (void *) skb->data;
+ struct hci_dev *hdev;
+
+ if (le16_to_cpu(hdr->len) < sizeof(*req))
+ return -EINVAL;
+
+ BT_DBG("id %d", req->id);
+
+ hdev = hci_dev_get(req->id);
+ if (!hdev || hdev->amp_type == HCI_BREDR) {
+ struct a2mp_amp_assoc_rsp rsp;
+ rsp.id = req->id;
+ rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
+
+ a2mp_send(mgr, A2MP_GETAMPASSOC_RSP, hdr->ident, sizeof(rsp),
+ &rsp);
+ goto clean;
+ }
+
+ /* Placeholder for HCI Read AMP Assoc */
+
+clean:
+ if (hdev)
+ hci_dev_put(hdev);
+
+ skb_pull(skb, sizeof(*req));
+ return 0;
+}
+
+static int a2mp_createphyslink_req(struct amp_mgr *mgr, struct sk_buff *skb,
+ struct a2mp_cmd *hdr)
+{
+ struct a2mp_physlink_req *req = (void *) skb->data;
+
+ struct a2mp_physlink_rsp rsp;
+ struct hci_dev *hdev;
+
+ if (le16_to_cpu(hdr->len) < sizeof(*req))
+ return -EINVAL;
+
+ BT_DBG("local_id %d, remote_id %d", req->local_id, req->remote_id);
+
+ rsp.local_id = req->remote_id;
+ rsp.remote_id = req->local_id;
+
+ hdev = hci_dev_get(req->remote_id);
+ if (!hdev || hdev->amp_type != HCI_AMP) {
+ rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
+ goto send_rsp;
+ }
+
+ /* TODO process physlink create */
+
+ rsp.status = A2MP_STATUS_SUCCESS;
+
+send_rsp:
+ if (hdev)
+ hci_dev_put(hdev);
+
+ a2mp_send(mgr, A2MP_CREATEPHYSLINK_RSP, hdr->ident, sizeof(rsp),
+ &rsp);
+
+ skb_pull(skb, le16_to_cpu(hdr->len));
+ return 0;
+}
+
+static int a2mp_discphyslink_req(struct amp_mgr *mgr, struct sk_buff *skb,
+ struct a2mp_cmd *hdr)
+{
+ struct a2mp_physlink_req *req = (void *) skb->data;
+ struct a2mp_physlink_rsp rsp;
+ struct hci_dev *hdev;
+
+ if (le16_to_cpu(hdr->len) < sizeof(*req))
+ return -EINVAL;
+
+ BT_DBG("local_id %d remote_id %d", req->local_id, req->remote_id);
+
+ rsp.local_id = req->remote_id;
+ rsp.remote_id = req->local_id;
+ rsp.status = A2MP_STATUS_SUCCESS;
+
+ hdev = hci_dev_get(req->local_id);
+ if (!hdev) {
+ rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
+ goto send_rsp;
+ }
+
+ /* TODO Disconnect Phys Link here */
+
+ hci_dev_put(hdev);
+
+send_rsp:
+ a2mp_send(mgr, A2MP_DISCONNPHYSLINK_RSP, hdr->ident, sizeof(rsp), &rsp);
+
+ skb_pull(skb, sizeof(*req));
+ return 0;
+}
+
+static inline int a2mp_cmd_rsp(struct amp_mgr *mgr, struct sk_buff *skb,
+ struct a2mp_cmd *hdr)
+{
+ BT_DBG("ident %d code %d", hdr->ident, hdr->code);
+
+ skb_pull(skb, le16_to_cpu(hdr->len));
+ return 0;
+}
+
+/* Handle A2MP signalling */
+static int a2mp_chan_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
+{
+ struct a2mp_cmd *hdr = (void *) skb->data;
+ struct amp_mgr *mgr = chan->data;
+ int err = 0;
+
+ amp_mgr_get(mgr);
+
+ while (skb->len >= sizeof(*hdr)) {
+ struct a2mp_cmd *hdr = (void *) skb->data;
+ u16 len = le16_to_cpu(hdr->len);
+
+ BT_DBG("code 0x%02x id %d len %d", hdr->code, hdr->ident, len);
+
+ skb_pull(skb, sizeof(*hdr));
+
+ if (len > skb->len || !hdr->ident) {
+ err = -EINVAL;
+ break;
+ }
+
+ mgr->ident = hdr->ident;
+
+ switch (hdr->code) {
+ case A2MP_COMMAND_REJ:
+ a2mp_command_rej(mgr, skb, hdr);
+ break;
+
+ case A2MP_DISCOVER_REQ:
+ err = a2mp_discover_req(mgr, skb, hdr);
+ break;
+
+ case A2MP_CHANGE_NOTIFY:
+ err = a2mp_change_notify(mgr, skb, hdr);
+ break;
+
+ case A2MP_GETINFO_REQ:
+ err = a2mp_getinfo_req(mgr, skb, hdr);
+ break;
+
+ case A2MP_GETAMPASSOC_REQ:
+ err = a2mp_getampassoc_req(mgr, skb, hdr);
+ break;
+
+ case A2MP_CREATEPHYSLINK_REQ:
+ err = a2mp_createphyslink_req(mgr, skb, hdr);
+ break;
+
+ case A2MP_DISCONNPHYSLINK_REQ:
+ err = a2mp_discphyslink_req(mgr, skb, hdr);
+ break;
+
+ case A2MP_CHANGE_RSP:
+ case A2MP_DISCOVER_RSP:
+ case A2MP_GETINFO_RSP:
+ case A2MP_GETAMPASSOC_RSP:
+ case A2MP_CREATEPHYSLINK_RSP:
+ case A2MP_DISCONNPHYSLINK_RSP:
+ err = a2mp_cmd_rsp(mgr, skb, hdr);
+ break;
+
+ default:
+ BT_ERR("Unknown A2MP sig cmd 0x%2.2x", hdr->code);
+ err = -EINVAL;
+ break;
+ }
+ }
+
+ if (err) {
+ struct a2mp_cmd_rej rej;
+ rej.reason = __constant_cpu_to_le16(0);
+
+ BT_DBG("Send A2MP Rej: cmd 0x%2.2x err %d", hdr->code, err);
+
+ a2mp_send(mgr, A2MP_COMMAND_REJ, hdr->ident, sizeof(rej),
+ &rej);
+ }
+
+ /* Always free skb and return success error code to prevent
+ from sending L2CAP Disconnect over A2MP channel */
+ kfree_skb(skb);
+
+ amp_mgr_put(mgr);
+
+ return 0;
+}
+
+static void a2mp_chan_close_cb(struct l2cap_chan *chan)
+{
+ l2cap_chan_destroy(chan);
+}
+
+static void a2mp_chan_state_change_cb(struct l2cap_chan *chan, int state)
+{
+ struct amp_mgr *mgr = chan->data;
+
+ if (!mgr)
+ return;
+
+ BT_DBG("chan %p state %s", chan, state_to_string(state));
+
+ chan->state = state;
+
+ switch (state) {
+ case BT_CLOSED:
+ if (mgr)
+ amp_mgr_put(mgr);
+ break;
+ }
+}
+
+static struct sk_buff *a2mp_chan_alloc_skb_cb(struct l2cap_chan *chan,
+ unsigned long len, int nb)
+{
+ return bt_skb_alloc(len, GFP_KERNEL);
+}
+
+static struct l2cap_ops a2mp_chan_ops = {
+ .name = "L2CAP A2MP channel",
+ .recv = a2mp_chan_recv_cb,
+ .close = a2mp_chan_close_cb,
+ .state_change = a2mp_chan_state_change_cb,
+ .alloc_skb = a2mp_chan_alloc_skb_cb,
+
+ /* Not implemented for A2MP */
+ .new_connection = l2cap_chan_no_new_connection,
+ .teardown = l2cap_chan_no_teardown,
+ .ready = l2cap_chan_no_ready,
+};
+
+static struct l2cap_chan *a2mp_chan_open(struct l2cap_conn *conn)
+{
+ struct l2cap_chan *chan;
+ int err;
+
+ chan = l2cap_chan_create();
+ if (!chan)
+ return NULL;
+
+ BT_DBG("chan %p", chan);
+
+ chan->chan_type = L2CAP_CHAN_CONN_FIX_A2MP;
+ chan->flush_to = L2CAP_DEFAULT_FLUSH_TO;
+
+ chan->ops = &a2mp_chan_ops;
+
+ l2cap_chan_set_defaults(chan);
+ chan->remote_max_tx = chan->max_tx;
+ chan->remote_tx_win = chan->tx_win;
+
+ chan->retrans_timeout = L2CAP_DEFAULT_RETRANS_TO;
+ chan->monitor_timeout = L2CAP_DEFAULT_MONITOR_TO;
+
+ skb_queue_head_init(&chan->tx_q);
+
+ chan->mode = L2CAP_MODE_ERTM;
+
+ err = l2cap_ertm_init(chan);
+ if (err < 0) {
+ l2cap_chan_del(chan, 0);
+ return NULL;
+ }
+
+ chan->conf_state = 0;
+
+ l2cap_chan_add(conn, chan);
+
+ chan->remote_mps = chan->omtu;
+ chan->mps = chan->omtu;
+
+ chan->state = BT_CONNECTED;
+
+ return chan;
+}
+
+/* AMP Manager functions */
+void amp_mgr_get(struct amp_mgr *mgr)
+{
+ BT_DBG("mgr %p orig refcnt %d", mgr, atomic_read(&mgr->kref.refcount));
+
+ kref_get(&mgr->kref);
+}
+
+static void amp_mgr_destroy(struct kref *kref)
+{
+ struct amp_mgr *mgr = container_of(kref, struct amp_mgr, kref);
+
+ BT_DBG("mgr %p", mgr);
+
+ kfree(mgr);
+}
+
+int amp_mgr_put(struct amp_mgr *mgr)
+{
+ BT_DBG("mgr %p orig refcnt %d", mgr, atomic_read(&mgr->kref.refcount));
+
+ return kref_put(&mgr->kref, &amp_mgr_destroy);
+}
+
+static struct amp_mgr *amp_mgr_create(struct l2cap_conn *conn)
+{
+ struct amp_mgr *mgr;
+ struct l2cap_chan *chan;
+
+ mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
+ if (!mgr)
+ return NULL;
+
+ BT_DBG("conn %p mgr %p", conn, mgr);
+
+ mgr->l2cap_conn = conn;
+
+ chan = a2mp_chan_open(conn);
+ if (!chan) {
+ kfree(mgr);
+ return NULL;
+ }
+
+ mgr->a2mp_chan = chan;
+ chan->data = mgr;
+
+ conn->hcon->amp_mgr = mgr;
+
+ kref_init(&mgr->kref);
+
+ return mgr;
+}
+
+struct l2cap_chan *a2mp_channel_create(struct l2cap_conn *conn,
+ struct sk_buff *skb)
+{
+ struct amp_mgr *mgr;
+
+ mgr = amp_mgr_create(conn);
+ if (!mgr) {
+ BT_ERR("Could not create AMP manager");
+ return NULL;
+ }
+
+ BT_DBG("mgr: %p chan %p", mgr, mgr->a2mp_chan);
+
+ return mgr->a2mp_chan;
+}