Orange Pi5 kernel

// 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);
}