linux/net/bluetooth/a2mp.c

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/*
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;
}