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-rw-r--r--net/bluetooth/a2mp.c1054
1 files changed, 1054 insertions, 0 deletions
diff --git a/net/bluetooth/a2mp.c b/net/bluetooth/a2mp.c
new file mode 100644
index 000000000..463bad584
--- /dev/null
+++ b/net/bluetooth/a2mp.c
@@ -0,0 +1,1054 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ Copyright (c) 2010,2011 Code Aurora Forum. All rights reserved.
+ Copyright (c) 2011,2012 Intel Corp.
+
+*/
+
+#include <net/bluetooth/bluetooth.h>
+#include <net/bluetooth/hci_core.h>
+#include <net/bluetooth/l2cap.h>
+
+#include "hci_request.h"
+#include "a2mp.h"
+#include "amp.h"
+
+#define A2MP_FEAT_EXT 0x8000
+
+/* Global AMP Manager list */
+static LIST_HEAD(amp_mgr_list);
+static DEFINE_MUTEX(amp_mgr_list_lock);
+
+/* 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));
+
+ iov_iter_kvec(&msg.msg_iter, WRITE, &iv, 1, total_len);
+
+ l2cap_chan_send(chan, &msg, total_len);
+
+ kfree(cmd);
+}
+
+static u8 __next_ident(struct amp_mgr *mgr)
+{
+ if (++mgr->ident == 0)
+ mgr->ident = 1;
+
+ return mgr->ident;
+}
+
+static struct amp_mgr *amp_mgr_lookup_by_state(u8 state)
+{
+ struct amp_mgr *mgr;
+
+ mutex_lock(&amp_mgr_list_lock);
+ list_for_each_entry(mgr, &amp_mgr_list, list) {
+ if (test_and_clear_bit(state, &mgr->state)) {
+ amp_mgr_get(mgr);
+ mutex_unlock(&amp_mgr_list_lock);
+ return mgr;
+ }
+ }
+ mutex_unlock(&amp_mgr_list_lock);
+
+ return NULL;
+}
+
+/* hci_dev_list shall be locked */
+static void __a2mp_add_cl(struct amp_mgr *mgr, struct a2mp_cl *cl)
+{
+ struct hci_dev *hdev;
+ int i = 1;
+
+ cl[0].id = AMP_ID_BREDR;
+ cl[0].type = AMP_TYPE_BREDR;
+ cl[0].status = AMP_STATUS_BLUETOOTH_ONLY;
+
+ list_for_each_entry(hdev, &hci_dev_list, list) {
+ if (hdev->dev_type == HCI_AMP) {
+ cl[i].id = hdev->id;
+ cl[i].type = hdev->amp_type;
+ if (test_bit(HCI_UP, &hdev->flags))
+ cl[i].status = hdev->amp_status;
+ else
+ cl[i].status = AMP_STATUS_POWERED_DOWN;
+ i++;
+ }
+ }
+}
+
+/* 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;
+ struct hci_dev *hdev;
+
+ 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);
+
+ /* at minimum the BR/EDR needs to be listed */
+ num_ctrl = 1;
+
+ list_for_each_entry(hdev, &hci_dev_list, list) {
+ if (hdev->dev_type == HCI_AMP)
+ num_ctrl++;
+ }
+
+ len = struct_size(rsp, cl, num_ctrl);
+ rsp = kmalloc(len, GFP_ATOMIC);
+ if (!rsp) {
+ read_unlock(&hci_dev_list_lock);
+ return -ENOMEM;
+ }
+
+ rsp->mtu = cpu_to_le16(L2CAP_A2MP_DEFAULT_MTU);
+ rsp->ext_feat = 0;
+
+ __a2mp_add_cl(mgr, rsp->cl);
+
+ read_unlock(&hci_dev_list_lock);
+
+ a2mp_send(mgr, A2MP_DISCOVER_RSP, hdr->ident, len, rsp);
+
+ kfree(rsp);
+ return 0;
+}
+
+static int a2mp_discover_rsp(struct amp_mgr *mgr, struct sk_buff *skb,
+ struct a2mp_cmd *hdr)
+{
+ struct a2mp_discov_rsp *rsp = (void *) skb->data;
+ u16 len = le16_to_cpu(hdr->len);
+ struct a2mp_cl *cl;
+ u16 ext_feat;
+ bool found = false;
+
+ if (len < sizeof(*rsp))
+ return -EINVAL;
+
+ len -= sizeof(*rsp);
+ skb_pull(skb, sizeof(*rsp));
+
+ ext_feat = le16_to_cpu(rsp->ext_feat);
+
+ BT_DBG("mtu %d efm 0x%4.4x", le16_to_cpu(rsp->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));
+ }
+
+ cl = (void *) skb->data;
+ while (len >= sizeof(*cl)) {
+ BT_DBG("Remote AMP id %d type %d status %d", cl->id, cl->type,
+ cl->status);
+
+ if (cl->id != AMP_ID_BREDR && cl->type != AMP_TYPE_BREDR) {
+ struct a2mp_info_req req;
+
+ found = true;
+
+ memset(&req, 0, sizeof(req));
+
+ req.id = cl->id;
+ a2mp_send(mgr, A2MP_GETINFO_REQ, __next_ident(mgr),
+ sizeof(req), &req);
+ }
+
+ len -= sizeof(*cl);
+ cl = skb_pull(skb, sizeof(*cl));
+ }
+
+ /* Fall back to L2CAP init sequence */
+ if (!found) {
+ struct l2cap_conn *conn = mgr->l2cap_conn;
+ struct l2cap_chan *chan;
+
+ mutex_lock(&conn->chan_lock);
+
+ list_for_each_entry(chan, &conn->chan_l, list) {
+
+ BT_DBG("chan %p state %s", chan,
+ state_to_string(chan->state));
+
+ if (chan->scid == L2CAP_CID_A2MP)
+ continue;
+
+ l2cap_chan_lock(chan);
+
+ if (chan->state == BT_CONNECT)
+ l2cap_send_conn_req(chan);
+
+ l2cap_chan_unlock(chan);
+ }
+
+ mutex_unlock(&conn->chan_lock);
+ }
+
+ 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 = skb_pull(skb, sizeof(*cl));
+ }
+
+ /* TODO send A2MP_CHANGE_RSP */
+
+ return 0;
+}
+
+static void read_local_amp_info_complete(struct hci_dev *hdev, u8 status,
+ u16 opcode)
+{
+ BT_DBG("%s status 0x%2.2x", hdev->name, status);
+
+ a2mp_send_getinfo_rsp(hdev);
+}
+
+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 hci_dev *hdev;
+ struct hci_request hreq;
+ int err = 0;
+
+ 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->dev_type != HCI_AMP) {
+ struct a2mp_info_rsp rsp;
+
+ memset(&rsp, 0, sizeof(rsp));
+
+ rsp.id = req->id;
+ rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
+
+ a2mp_send(mgr, A2MP_GETINFO_RSP, hdr->ident, sizeof(rsp),
+ &rsp);
+
+ goto done;
+ }
+
+ set_bit(READ_LOC_AMP_INFO, &mgr->state);
+ hci_req_init(&hreq, hdev);
+ hci_req_add(&hreq, HCI_OP_READ_LOCAL_AMP_INFO, 0, NULL);
+ err = hci_req_run(&hreq, read_local_amp_info_complete);
+ if (err < 0)
+ a2mp_send_getinfo_rsp(hdev);
+
+done:
+ if (hdev)
+ hci_dev_put(hdev);
+
+ skb_pull(skb, sizeof(*req));
+ return 0;
+}
+
+static int a2mp_getinfo_rsp(struct amp_mgr *mgr, struct sk_buff *skb,
+ struct a2mp_cmd *hdr)
+{
+ struct a2mp_info_rsp *rsp = (struct a2mp_info_rsp *) skb->data;
+ struct a2mp_amp_assoc_req req;
+ struct amp_ctrl *ctrl;
+
+ if (le16_to_cpu(hdr->len) < sizeof(*rsp))
+ return -EINVAL;
+
+ BT_DBG("id %d status 0x%2.2x", rsp->id, rsp->status);
+
+ if (rsp->status)
+ return -EINVAL;
+
+ ctrl = amp_ctrl_add(mgr, rsp->id);
+ if (!ctrl)
+ return -ENOMEM;
+
+ memset(&req, 0, sizeof(req));
+
+ req.id = rsp->id;
+ a2mp_send(mgr, A2MP_GETAMPASSOC_REQ, __next_ident(mgr), sizeof(req),
+ &req);
+
+ skb_pull(skb, sizeof(*rsp));
+ 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;
+ struct amp_mgr *tmp;
+
+ if (le16_to_cpu(hdr->len) < sizeof(*req))
+ return -EINVAL;
+
+ BT_DBG("id %d", req->id);
+
+ /* Make sure that other request is not processed */
+ tmp = amp_mgr_lookup_by_state(READ_LOC_AMP_ASSOC);
+
+ hdev = hci_dev_get(req->id);
+ if (!hdev || hdev->amp_type == AMP_TYPE_BREDR || tmp) {
+ struct a2mp_amp_assoc_rsp rsp;
+
+ memset(&rsp, 0, sizeof(rsp));
+ rsp.id = req->id;
+
+ if (tmp) {
+ rsp.status = A2MP_STATUS_COLLISION_OCCURED;
+ amp_mgr_put(tmp);
+ } else {
+ rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
+ }
+
+ a2mp_send(mgr, A2MP_GETAMPASSOC_RSP, hdr->ident, sizeof(rsp),
+ &rsp);
+
+ goto done;
+ }
+
+ amp_read_loc_assoc(hdev, mgr);
+
+done:
+ if (hdev)
+ hci_dev_put(hdev);
+
+ skb_pull(skb, sizeof(*req));
+ return 0;
+}
+
+static int a2mp_getampassoc_rsp(struct amp_mgr *mgr, struct sk_buff *skb,
+ struct a2mp_cmd *hdr)
+{
+ struct a2mp_amp_assoc_rsp *rsp = (void *) skb->data;
+ u16 len = le16_to_cpu(hdr->len);
+ struct hci_dev *hdev;
+ struct amp_ctrl *ctrl;
+ struct hci_conn *hcon;
+ size_t assoc_len;
+
+ if (len < sizeof(*rsp))
+ return -EINVAL;
+
+ assoc_len = len - sizeof(*rsp);
+
+ BT_DBG("id %d status 0x%2.2x assoc len %zu", rsp->id, rsp->status,
+ assoc_len);
+
+ if (rsp->status)
+ return -EINVAL;
+
+ /* Save remote ASSOC data */
+ ctrl = amp_ctrl_lookup(mgr, rsp->id);
+ if (ctrl) {
+ u8 *assoc;
+
+ assoc = kmemdup(rsp->amp_assoc, assoc_len, GFP_KERNEL);
+ if (!assoc) {
+ amp_ctrl_put(ctrl);
+ return -ENOMEM;
+ }
+
+ ctrl->assoc = assoc;
+ ctrl->assoc_len = assoc_len;
+ ctrl->assoc_rem_len = assoc_len;
+ ctrl->assoc_len_so_far = 0;
+
+ amp_ctrl_put(ctrl);
+ }
+
+ /* Create Phys Link */
+ hdev = hci_dev_get(rsp->id);
+ if (!hdev)
+ return -EINVAL;
+
+ hcon = phylink_add(hdev, mgr, rsp->id, true);
+ if (!hcon)
+ goto done;
+
+ BT_DBG("Created hcon %p: loc:%d -> rem:%d", hcon, hdev->id, rsp->id);
+
+ mgr->bredr_chan->remote_amp_id = rsp->id;
+
+ amp_create_phylink(hdev, mgr, hcon);
+
+done:
+ hci_dev_put(hdev);
+ skb_pull(skb, len);
+ 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;
+ struct hci_conn *hcon;
+ struct amp_ctrl *ctrl;
+
+ if (le16_to_cpu(hdr->len) < sizeof(*req))
+ return -EINVAL;
+
+ BT_DBG("local_id %d, remote_id %d", req->local_id, req->remote_id);
+
+ memset(&rsp, 0, sizeof(rsp));
+
+ rsp.local_id = req->remote_id;
+ rsp.remote_id = req->local_id;
+
+ hdev = hci_dev_get(req->remote_id);
+ if (!hdev || hdev->amp_type == AMP_TYPE_BREDR) {
+ rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
+ goto send_rsp;
+ }
+
+ ctrl = amp_ctrl_lookup(mgr, rsp.remote_id);
+ if (!ctrl) {
+ ctrl = amp_ctrl_add(mgr, rsp.remote_id);
+ if (ctrl) {
+ amp_ctrl_get(ctrl);
+ } else {
+ rsp.status = A2MP_STATUS_UNABLE_START_LINK_CREATION;
+ goto send_rsp;
+ }
+ }
+
+ if (ctrl) {
+ size_t assoc_len = le16_to_cpu(hdr->len) - sizeof(*req);
+ u8 *assoc;
+
+ assoc = kmemdup(req->amp_assoc, assoc_len, GFP_KERNEL);
+ if (!assoc) {
+ amp_ctrl_put(ctrl);
+ hci_dev_put(hdev);
+ return -ENOMEM;
+ }
+
+ ctrl->assoc = assoc;
+ ctrl->assoc_len = assoc_len;
+ ctrl->assoc_rem_len = assoc_len;
+ ctrl->assoc_len_so_far = 0;
+
+ amp_ctrl_put(ctrl);
+ }
+
+ hcon = phylink_add(hdev, mgr, req->local_id, false);
+ if (hcon) {
+ amp_accept_phylink(hdev, mgr, hcon);
+ rsp.status = A2MP_STATUS_SUCCESS;
+ } else {
+ rsp.status = A2MP_STATUS_UNABLE_START_LINK_CREATION;
+ }
+
+send_rsp:
+ if (hdev)
+ hci_dev_put(hdev);
+
+ /* Reply error now and success after HCI Write Remote AMP Assoc
+ command complete with success status
+ */
+ if (rsp.status != A2MP_STATUS_SUCCESS) {
+ a2mp_send(mgr, A2MP_CREATEPHYSLINK_RSP, hdr->ident,
+ sizeof(rsp), &rsp);
+ } else {
+ set_bit(WRITE_REMOTE_AMP_ASSOC, &mgr->state);
+ mgr->ident = hdr->ident;
+ }
+
+ 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;
+ struct hci_conn *hcon;
+
+ if (le16_to_cpu(hdr->len) < sizeof(*req))
+ return -EINVAL;
+
+ BT_DBG("local_id %d remote_id %d", req->local_id, req->remote_id);
+
+ memset(&rsp, 0, sizeof(rsp));
+
+ rsp.local_id = req->remote_id;
+ rsp.remote_id = req->local_id;
+ rsp.status = A2MP_STATUS_SUCCESS;
+
+ hdev = hci_dev_get(req->remote_id);
+ if (!hdev) {
+ rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
+ goto send_rsp;
+ }
+
+ hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK,
+ &mgr->l2cap_conn->hcon->dst);
+ if (!hcon) {
+ bt_dev_err(hdev, "no phys link exist");
+ rsp.status = A2MP_STATUS_NO_PHYSICAL_LINK_EXISTS;
+ goto clean;
+ }
+
+ /* TODO Disconnect Phys Link here */
+
+clean:
+ 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 0x%2.2x", 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;
+ struct amp_mgr *mgr = chan->data;
+ int err = 0;
+
+ amp_mgr_get(mgr);
+
+ while (skb->len >= sizeof(*hdr)) {
+ u16 len;
+
+ hdr = (void *) skb->data;
+ len = le16_to_cpu(hdr->len);
+
+ BT_DBG("code 0x%2.2x id %d len %u", 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_DISCOVER_RSP:
+ err = a2mp_discover_rsp(mgr, skb, hdr);
+ break;
+
+ case A2MP_GETINFO_RSP:
+ err = a2mp_getinfo_rsp(mgr, skb, hdr);
+ break;
+
+ case A2MP_GETAMPASSOC_RSP:
+ err = a2mp_getampassoc_rsp(mgr, skb, hdr);
+ break;
+
+ case A2MP_CHANGE_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;
+
+ memset(&rej, 0, sizeof(rej));
+
+ rej.reason = cpu_to_le16(0);
+ hdr = (void *) skb->data;
+
+ 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_put(chan);
+}
+
+static void a2mp_chan_state_change_cb(struct l2cap_chan *chan, int state,
+ int err)
+{
+ 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 hdr_len,
+ unsigned long len, int nb)
+{
+ struct sk_buff *skb;
+
+ skb = bt_skb_alloc(hdr_len + len, GFP_KERNEL);
+ if (!skb)
+ return ERR_PTR(-ENOMEM);
+
+ return skb;
+}
+
+static const 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,
+ .defer = l2cap_chan_no_defer,
+ .resume = l2cap_chan_no_resume,
+ .set_shutdown = l2cap_chan_no_set_shutdown,
+ .get_sndtimeo = l2cap_chan_no_get_sndtimeo,
+};
+
+static struct l2cap_chan *a2mp_chan_open(struct l2cap_conn *conn, bool locked)
+{
+ struct l2cap_chan *chan;
+ int err;
+
+ chan = l2cap_chan_create();
+ if (!chan)
+ return NULL;
+
+ BT_DBG("chan %p", chan);
+
+ chan->chan_type = L2CAP_CHAN_FIXED;
+ chan->scid = L2CAP_CID_A2MP;
+ chan->dcid = L2CAP_CID_A2MP;
+ chan->omtu = L2CAP_A2MP_DEFAULT_MTU;
+ chan->imtu = L2CAP_A2MP_DEFAULT_MTU;
+ 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;
+
+ if (locked)
+ __l2cap_chan_add(conn, chan);
+ else
+ l2cap_chan_add(conn, chan);
+
+ chan->remote_mps = chan->omtu;
+ chan->mps = chan->omtu;
+
+ chan->state = BT_CONNECTED;
+
+ return chan;
+}
+
+/* AMP Manager functions */
+struct amp_mgr *amp_mgr_get(struct amp_mgr *mgr)
+{
+ BT_DBG("mgr %p orig refcnt %d", mgr, kref_read(&mgr->kref));
+
+ kref_get(&mgr->kref);
+
+ return mgr;
+}
+
+static void amp_mgr_destroy(struct kref *kref)
+{
+ struct amp_mgr *mgr = container_of(kref, struct amp_mgr, kref);
+
+ BT_DBG("mgr %p", mgr);
+
+ mutex_lock(&amp_mgr_list_lock);
+ list_del(&mgr->list);
+ mutex_unlock(&amp_mgr_list_lock);
+
+ amp_ctrl_list_flush(mgr);
+ kfree(mgr);
+}
+
+int amp_mgr_put(struct amp_mgr *mgr)
+{
+ BT_DBG("mgr %p orig refcnt %d", mgr, kref_read(&mgr->kref));
+
+ return kref_put(&mgr->kref, &amp_mgr_destroy);
+}
+
+static struct amp_mgr *amp_mgr_create(struct l2cap_conn *conn, bool locked)
+{
+ 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, locked);
+ if (!chan) {
+ kfree(mgr);
+ return NULL;
+ }
+
+ mgr->a2mp_chan = chan;
+ chan->data = mgr;
+
+ conn->hcon->amp_mgr = mgr;
+
+ kref_init(&mgr->kref);
+
+ /* Remote AMP ctrl list initialization */
+ INIT_LIST_HEAD(&mgr->amp_ctrls);
+ mutex_init(&mgr->amp_ctrls_lock);
+
+ mutex_lock(&amp_mgr_list_lock);
+ list_add(&mgr->list, &amp_mgr_list);
+ mutex_unlock(&amp_mgr_list_lock);
+
+ return mgr;
+}
+
+struct l2cap_chan *a2mp_channel_create(struct l2cap_conn *conn,
+ struct sk_buff *skb)
+{
+ struct amp_mgr *mgr;
+
+ if (conn->hcon->type != ACL_LINK)
+ return NULL;
+
+ mgr = amp_mgr_create(conn, false);
+ 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;
+}
+
+void a2mp_send_getinfo_rsp(struct hci_dev *hdev)
+{
+ struct amp_mgr *mgr;
+ struct a2mp_info_rsp rsp;
+
+ mgr = amp_mgr_lookup_by_state(READ_LOC_AMP_INFO);
+ if (!mgr)
+ return;
+
+ BT_DBG("%s mgr %p", hdev->name, mgr);
+
+ memset(&rsp, 0, sizeof(rsp));
+
+ rsp.id = hdev->id;
+ rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
+
+ if (hdev->amp_type != AMP_TYPE_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);
+ }
+
+ a2mp_send(mgr, A2MP_GETINFO_RSP, mgr->ident, sizeof(rsp), &rsp);
+ amp_mgr_put(mgr);
+}
+
+void a2mp_send_getampassoc_rsp(struct hci_dev *hdev, u8 status)
+{
+ struct amp_mgr *mgr;
+ struct amp_assoc *loc_assoc = &hdev->loc_assoc;
+ struct a2mp_amp_assoc_rsp *rsp;
+ size_t len;
+
+ mgr = amp_mgr_lookup_by_state(READ_LOC_AMP_ASSOC);
+ if (!mgr)
+ return;
+
+ BT_DBG("%s mgr %p", hdev->name, mgr);
+
+ len = sizeof(struct a2mp_amp_assoc_rsp) + loc_assoc->len;
+ rsp = kzalloc(len, GFP_KERNEL);
+ if (!rsp) {
+ amp_mgr_put(mgr);
+ return;
+ }
+
+ rsp->id = hdev->id;
+
+ if (status) {
+ rsp->status = A2MP_STATUS_INVALID_CTRL_ID;
+ } else {
+ rsp->status = A2MP_STATUS_SUCCESS;
+ memcpy(rsp->amp_assoc, loc_assoc->data, loc_assoc->len);
+ }
+
+ a2mp_send(mgr, A2MP_GETAMPASSOC_RSP, mgr->ident, len, rsp);
+ amp_mgr_put(mgr);
+ kfree(rsp);
+}
+
+void a2mp_send_create_phy_link_req(struct hci_dev *hdev, u8 status)
+{
+ struct amp_mgr *mgr;
+ struct amp_assoc *loc_assoc = &hdev->loc_assoc;
+ struct a2mp_physlink_req *req;
+ struct l2cap_chan *bredr_chan;
+ size_t len;
+
+ mgr = amp_mgr_lookup_by_state(READ_LOC_AMP_ASSOC_FINAL);
+ if (!mgr)
+ return;
+
+ len = sizeof(*req) + loc_assoc->len;
+
+ BT_DBG("%s mgr %p assoc_len %zu", hdev->name, mgr, len);
+
+ req = kzalloc(len, GFP_KERNEL);
+ if (!req) {
+ amp_mgr_put(mgr);
+ return;
+ }
+
+ bredr_chan = mgr->bredr_chan;
+ if (!bredr_chan)
+ goto clean;
+
+ req->local_id = hdev->id;
+ req->remote_id = bredr_chan->remote_amp_id;
+ memcpy(req->amp_assoc, loc_assoc->data, loc_assoc->len);
+
+ a2mp_send(mgr, A2MP_CREATEPHYSLINK_REQ, __next_ident(mgr), len, req);
+
+clean:
+ amp_mgr_put(mgr);
+ kfree(req);
+}
+
+void a2mp_send_create_phy_link_rsp(struct hci_dev *hdev, u8 status)
+{
+ struct amp_mgr *mgr;
+ struct a2mp_physlink_rsp rsp;
+ struct hci_conn *hs_hcon;
+
+ mgr = amp_mgr_lookup_by_state(WRITE_REMOTE_AMP_ASSOC);
+ if (!mgr)
+ return;
+
+ memset(&rsp, 0, sizeof(rsp));
+
+ hs_hcon = hci_conn_hash_lookup_state(hdev, AMP_LINK, BT_CONNECT);
+ if (!hs_hcon) {
+ rsp.status = A2MP_STATUS_UNABLE_START_LINK_CREATION;
+ } else {
+ rsp.remote_id = hs_hcon->remote_id;
+ rsp.status = A2MP_STATUS_SUCCESS;
+ }
+
+ BT_DBG("%s mgr %p hs_hcon %p status %u", hdev->name, mgr, hs_hcon,
+ status);
+
+ rsp.local_id = hdev->id;
+ a2mp_send(mgr, A2MP_CREATEPHYSLINK_RSP, mgr->ident, sizeof(rsp), &rsp);
+ amp_mgr_put(mgr);
+}
+
+void a2mp_discover_amp(struct l2cap_chan *chan)
+{
+ struct l2cap_conn *conn = chan->conn;
+ struct amp_mgr *mgr = conn->hcon->amp_mgr;
+ struct a2mp_discov_req req;
+
+ BT_DBG("chan %p conn %p mgr %p", chan, conn, mgr);
+
+ if (!mgr) {
+ mgr = amp_mgr_create(conn, true);
+ if (!mgr)
+ return;
+ }
+
+ mgr->bredr_chan = chan;
+
+ memset(&req, 0, sizeof(req));
+
+ req.mtu = cpu_to_le16(L2CAP_A2MP_DEFAULT_MTU);
+ req.ext_feat = 0;
+ a2mp_send(mgr, A2MP_DISCOVER_REQ, 1, sizeof(req), &req);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-14 22:11:06 +0000