2012-05-29 12:59:01 +02:00
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/*
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Copyright (c) 2010,2011 Code Aurora Forum. All rights reserved.
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Copyright (c) 2011,2012 Intel Corp.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License version 2 and
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only version 2 as published by the Free Software Foundation.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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*/
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#include <net/bluetooth/bluetooth.h>
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#include <net/bluetooth/hci_core.h>
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#include <net/bluetooth/l2cap.h>
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2012-05-29 12:59:02 +02:00
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#include <net/bluetooth/a2mp.h>
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2012-05-29 12:59:01 +02:00
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2012-05-29 12:59:03 +02:00
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/* A2MP build & send command helper functions */
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static struct a2mp_cmd *__a2mp_build(u8 code, u8 ident, u16 len, void *data)
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{
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struct a2mp_cmd *cmd;
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int plen;
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plen = sizeof(*cmd) + len;
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cmd = kzalloc(plen, GFP_KERNEL);
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if (!cmd)
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return NULL;
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cmd->code = code;
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cmd->ident = ident;
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cmd->len = cpu_to_le16(len);
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memcpy(cmd->data, data, len);
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return cmd;
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}
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static void a2mp_send(struct amp_mgr *mgr, u8 code, u8 ident, u16 len,
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void *data)
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{
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struct l2cap_chan *chan = mgr->a2mp_chan;
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struct a2mp_cmd *cmd;
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u16 total_len = len + sizeof(*cmd);
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struct kvec iv;
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struct msghdr msg;
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cmd = __a2mp_build(code, ident, len, data);
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if (!cmd)
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return;
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iv.iov_base = cmd;
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iv.iov_len = total_len;
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memset(&msg, 0, sizeof(msg));
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msg.msg_iov = (struct iovec *) &iv;
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msg.msg_iovlen = 1;
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l2cap_chan_send(chan, &msg, total_len, 0);
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kfree(cmd);
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}
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2012-05-29 12:59:07 +02:00
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/* Handle A2MP signalling */
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static int a2mp_chan_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
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{
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struct a2mp_cmd *hdr = (void *) skb->data;
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struct amp_mgr *mgr = chan->data;
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int err = 0;
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amp_mgr_get(mgr);
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while (skb->len >= sizeof(*hdr)) {
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struct a2mp_cmd *hdr = (void *) skb->data;
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u16 len = le16_to_cpu(hdr->len);
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BT_DBG("code 0x%02x id %d len %d", hdr->code, hdr->ident, len);
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skb_pull(skb, sizeof(*hdr));
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if (len > skb->len || !hdr->ident) {
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err = -EINVAL;
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break;
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}
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mgr->ident = hdr->ident;
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switch (hdr->code) {
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case A2MP_COMMAND_REJ:
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case A2MP_DISCOVER_REQ:
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case A2MP_CHANGE_NOTIFY:
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case A2MP_GETINFO_REQ:
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case A2MP_GETAMPASSOC_REQ:
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case A2MP_CREATEPHYSLINK_REQ:
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case A2MP_DISCONNPHYSLINK_REQ:
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case A2MP_CHANGE_RSP:
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case A2MP_DISCOVER_RSP:
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case A2MP_GETINFO_RSP:
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case A2MP_GETAMPASSOC_RSP:
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case A2MP_CREATEPHYSLINK_RSP:
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case A2MP_DISCONNPHYSLINK_RSP:
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default:
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BT_ERR("Unknown A2MP sig cmd 0x%2.2x", hdr->code);
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err = -EINVAL;
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break;
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}
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}
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if (err) {
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struct a2mp_cmd_rej rej;
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rej.reason = __constant_cpu_to_le16(0);
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BT_DBG("Send A2MP Rej: cmd 0x%2.2x err %d", hdr->code, err);
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a2mp_send(mgr, A2MP_COMMAND_REJ, hdr->ident, sizeof(rej),
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&rej);
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}
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/* Always free skb and return success error code to prevent
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from sending L2CAP Disconnect over A2MP channel */
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kfree_skb(skb);
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amp_mgr_put(mgr);
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return 0;
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}
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2012-05-29 12:59:04 +02:00
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static void a2mp_chan_close_cb(struct l2cap_chan *chan)
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{
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l2cap_chan_destroy(chan);
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}
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static void a2mp_chan_state_change_cb(struct l2cap_chan *chan, int state)
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{
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struct amp_mgr *mgr = chan->data;
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if (!mgr)
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return;
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BT_DBG("chan %p state %s", chan, state_to_string(state));
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chan->state = state;
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switch (state) {
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case BT_CLOSED:
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if (mgr)
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amp_mgr_put(mgr);
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break;
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}
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}
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static struct sk_buff *a2mp_chan_alloc_skb_cb(struct l2cap_chan *chan,
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unsigned long len, int nb)
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{
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return bt_skb_alloc(len, GFP_KERNEL);
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}
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static struct l2cap_chan *a2mp_chan_no_new_conn_cb(struct l2cap_chan *chan)
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{
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BT_ERR("new_connection for chan %p not implemented", chan);
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return NULL;
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}
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static void a2mp_chan_no_teardown_cb(struct l2cap_chan *chan, int err)
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{
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BT_ERR("teardown for chan %p not implemented", chan);
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}
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static void a2mp_chan_no_ready(struct l2cap_chan *chan)
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{
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BT_ERR("ready for chan %p not implemented", chan);
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}
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2012-05-29 12:59:01 +02:00
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static struct l2cap_ops a2mp_chan_ops = {
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.name = "L2CAP A2MP channel",
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2012-05-29 12:59:07 +02:00
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.recv = a2mp_chan_recv_cb,
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2012-05-29 12:59:04 +02:00
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.close = a2mp_chan_close_cb,
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.state_change = a2mp_chan_state_change_cb,
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.alloc_skb = a2mp_chan_alloc_skb_cb,
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/* Not implemented for A2MP */
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.new_connection = a2mp_chan_no_new_conn_cb,
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.teardown = a2mp_chan_no_teardown_cb,
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.ready = a2mp_chan_no_ready,
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2012-05-29 12:59:01 +02:00
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};
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static struct l2cap_chan *a2mp_chan_open(struct l2cap_conn *conn)
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{
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struct l2cap_chan *chan;
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int err;
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chan = l2cap_chan_create();
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if (!chan)
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return NULL;
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BT_DBG("chan %p", chan);
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hci_conn_hold(conn->hcon);
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chan->omtu = L2CAP_A2MP_DEFAULT_MTU;
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chan->imtu = L2CAP_A2MP_DEFAULT_MTU;
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chan->flush_to = L2CAP_DEFAULT_FLUSH_TO;
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chan->ops = &a2mp_chan_ops;
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l2cap_chan_set_defaults(chan);
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chan->remote_max_tx = chan->max_tx;
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chan->remote_tx_win = chan->tx_win;
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chan->retrans_timeout = L2CAP_DEFAULT_RETRANS_TO;
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chan->monitor_timeout = L2CAP_DEFAULT_MONITOR_TO;
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skb_queue_head_init(&chan->tx_q);
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chan->mode = L2CAP_MODE_ERTM;
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err = l2cap_ertm_init(chan);
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if (err < 0) {
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l2cap_chan_del(chan, 0);
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return NULL;
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}
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chan->conf_state = 0;
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l2cap_chan_add(conn, chan);
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chan->remote_mps = chan->omtu;
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chan->mps = chan->omtu;
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chan->state = BT_CONNECTED;
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return chan;
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}
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2012-05-29 12:59:02 +02:00
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/* AMP Manager functions */
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void amp_mgr_get(struct amp_mgr *mgr)
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{
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BT_DBG("mgr %p", mgr);
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kref_get(&mgr->kref);
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}
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static void amp_mgr_destroy(struct kref *kref)
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{
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struct amp_mgr *mgr = container_of(kref, struct amp_mgr, kref);
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BT_DBG("mgr %p", mgr);
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kfree(mgr);
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}
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int amp_mgr_put(struct amp_mgr *mgr)
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{
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BT_DBG("mgr %p", mgr);
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return kref_put(&mgr->kref, &_mgr_destroy);
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}
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static struct amp_mgr *amp_mgr_create(struct l2cap_conn *conn)
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{
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struct amp_mgr *mgr;
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struct l2cap_chan *chan;
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mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
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if (!mgr)
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return NULL;
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BT_DBG("conn %p mgr %p", conn, mgr);
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mgr->l2cap_conn = conn;
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chan = a2mp_chan_open(conn);
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if (!chan) {
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kfree(mgr);
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return NULL;
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}
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mgr->a2mp_chan = chan;
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chan->data = mgr;
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conn->hcon->amp_mgr = mgr;
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kref_init(&mgr->kref);
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return mgr;
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}
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