root / hw / bt-l2cap.c @ 7267c094
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/*
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* QEMU Bluetooth L2CAP logic.
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*
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* Copyright (C) 2008 Andrzej Zaborowski <balrog@zabor.org>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu-common.h" |
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#include "qemu-timer.h" |
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#include "bt.h" |
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#define L2CAP_CID_MAX 0x100 /* Between 0x40 and 0x10000 */ |
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struct l2cap_instance_s {
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struct bt_link_s *link;
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struct bt_l2cap_device_s *dev;
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int role;
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uint8_t frame_in[65535 + L2CAP_HDR_SIZE] __attribute__ ((aligned (4))); |
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int frame_in_len;
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uint8_t frame_out[65535 + L2CAP_HDR_SIZE] __attribute__ ((aligned (4))); |
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int frame_out_len;
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/* Signalling channel timers. They exist per-request but we can make
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* sure we have no more than one outstanding request at any time. */
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QEMUTimer *rtx; |
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QEMUTimer *ertx; |
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int last_id;
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int next_id;
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struct l2cap_chan_s {
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struct bt_l2cap_conn_params_s params;
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void (*frame_in)(struct l2cap_chan_s *chan, uint16_t cid, |
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const l2cap_hdr *hdr, int len); |
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int mps;
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int min_mtu;
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struct l2cap_instance_s *l2cap;
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/* Only allocated channels */
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uint16_t remote_cid; |
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#define L2CAP_CFG_INIT 2 |
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#define L2CAP_CFG_ACC 1 |
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int config_req_id; /* TODO: handle outgoing requests generically */ |
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int config;
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|
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/* Only connection-oriented channels. Note: if we allow the tx and
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* rx traffic to be in different modes at any time, we need two. */
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int mode;
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|
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/* Only flow-controlled, connection-oriented channels */
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uint8_t sdu[65536]; /* TODO: dynamically allocate */ |
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int len_cur, len_total;
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int rexmit;
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int monitor_timeout;
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QEMUTimer *monitor_timer; |
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QEMUTimer *retransmission_timer; |
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} *cid[L2CAP_CID_MAX]; |
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/* The channel state machine states map as following:
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* CLOSED -> !cid[N]
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* WAIT_CONNECT -> never occurs
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* WAIT_CONNECT_RSP -> never occurs
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* CONFIG -> cid[N] && config < 3
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* WAIT_CONFIG -> never occurs, cid[N] && config == 0 && !config_r
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* WAIT_SEND_CONFIG -> never occurs, cid[N] && config == 1 && !config_r
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* WAIT_CONFIG_REQ_RSP -> cid[N] && config == 0 && config_req_id
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* WAIT_CONFIG_RSP -> cid[N] && config == 1 && config_req_id
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* WAIT_CONFIG_REQ -> cid[N] && config == 2
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* OPEN -> cid[N] && config == 3
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* WAIT_DISCONNECT -> never occurs
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*/
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struct l2cap_chan_s signalling_ch;
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struct l2cap_chan_s group_ch;
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}; |
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struct slave_l2cap_instance_s {
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struct bt_link_s link; /* Underlying logical link (ACL) */ |
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struct l2cap_instance_s l2cap;
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}; |
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struct bt_l2cap_psm_s {
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int psm;
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int min_mtu;
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int (*new_channel)(struct bt_l2cap_device_s *device, |
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struct bt_l2cap_conn_params_s *params);
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struct bt_l2cap_psm_s *next;
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}; |
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static const uint16_t l2cap_fcs16_table[256] = { |
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0x0000, 0xc0c1, 0xc181, 0x0140, 0xc301, 0x03c0, 0x0280, 0xc241, |
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0xc601, 0x06c0, 0x0780, 0xc741, 0x0500, 0xc5c1, 0xc481, 0x0440, |
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0xcc01, 0x0cc0, 0x0d80, 0xcd41, 0x0f00, 0xcfc1, 0xce81, 0x0e40, |
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0x0a00, 0xcac1, 0xcb81, 0x0b40, 0xc901, 0x09c0, 0x0880, 0xc841, |
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0xd801, 0x18c0, 0x1980, 0xd941, 0x1b00, 0xdbc1, 0xda81, 0x1a40, |
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0x1e00, 0xdec1, 0xdf81, 0x1f40, 0xdd01, 0x1dc0, 0x1c80, 0xdc41, |
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0x1400, 0xd4c1, 0xd581, 0x1540, 0xd701, 0x17c0, 0x1680, 0xd641, |
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0xd201, 0x12c0, 0x1380, 0xd341, 0x1100, 0xd1c1, 0xd081, 0x1040, |
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0xf001, 0x30c0, 0x3180, 0xf141, 0x3300, 0xf3c1, 0xf281, 0x3240, |
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0x3600, 0xf6c1, 0xf781, 0x3740, 0xf501, 0x35c0, 0x3480, 0xf441, |
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0x3c00, 0xfcc1, 0xfd81, 0x3d40, 0xff01, 0x3fc0, 0x3e80, 0xfe41, |
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0xfa01, 0x3ac0, 0x3b80, 0xfb41, 0x3900, 0xf9c1, 0xf881, 0x3840, |
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0x2800, 0xe8c1, 0xe981, 0x2940, 0xeb01, 0x2bc0, 0x2a80, 0xea41, |
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0xee01, 0x2ec0, 0x2f80, 0xef41, 0x2d00, 0xedc1, 0xec81, 0x2c40, |
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0xe401, 0x24c0, 0x2580, 0xe541, 0x2700, 0xe7c1, 0xe681, 0x2640, |
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0x2200, 0xe2c1, 0xe381, 0x2340, 0xe101, 0x21c0, 0x2080, 0xe041, |
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0xa001, 0x60c0, 0x6180, 0xa141, 0x6300, 0xa3c1, 0xa281, 0x6240, |
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0x6600, 0xa6c1, 0xa781, 0x6740, 0xa501, 0x65c0, 0x6480, 0xa441, |
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0x6c00, 0xacc1, 0xad81, 0x6d40, 0xaf01, 0x6fc0, 0x6e80, 0xae41, |
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0xaa01, 0x6ac0, 0x6b80, 0xab41, 0x6900, 0xa9c1, 0xa881, 0x6840, |
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0x7800, 0xb8c1, 0xb981, 0x7940, 0xbb01, 0x7bc0, 0x7a80, 0xba41, |
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0xbe01, 0x7ec0, 0x7f80, 0xbf41, 0x7d00, 0xbdc1, 0xbc81, 0x7c40, |
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0xb401, 0x74c0, 0x7580, 0xb541, 0x7700, 0xb7c1, 0xb681, 0x7640, |
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0x7200, 0xb2c1, 0xb381, 0x7340, 0xb101, 0x71c0, 0x7080, 0xb041, |
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0x5000, 0x90c1, 0x9181, 0x5140, 0x9301, 0x53c0, 0x5280, 0x9241, |
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0x9601, 0x56c0, 0x5780, 0x9741, 0x5500, 0x95c1, 0x9481, 0x5440, |
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0x9c01, 0x5cc0, 0x5d80, 0x9d41, 0x5f00, 0x9fc1, 0x9e81, 0x5e40, |
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0x5a00, 0x9ac1, 0x9b81, 0x5b40, 0x9901, 0x59c0, 0x5880, 0x9841, |
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0x8801, 0x48c0, 0x4980, 0x8941, 0x4b00, 0x8bc1, 0x8a81, 0x4a40, |
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0x4e00, 0x8ec1, 0x8f81, 0x4f40, 0x8d01, 0x4dc0, 0x4c80, 0x8c41, |
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0x4400, 0x84c1, 0x8581, 0x4540, 0x8701, 0x47c0, 0x4680, 0x8641, |
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0x8201, 0x42c0, 0x4380, 0x8341, 0x4100, 0x81c1, 0x8081, 0x4040, |
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}; |
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static uint16_t l2cap_fcs16(const uint8_t *message, int len) |
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{
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uint16_t fcs = 0x0000;
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while (len --)
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#if 0
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{
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int i;
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fcs ^= *message ++;
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for (i = 8; i; -- i)
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if (fcs & 1)
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fcs = (fcs >> 1) ^ 0xa001;
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else
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fcs = (fcs >> 1);
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}
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#else
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fcs = (fcs >> 8) ^ l2cap_fcs16_table[(fcs ^ *message ++) & 0xff]; |
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#endif
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return fcs;
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} |
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/* L2CAP layer logic (protocol) */
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static void l2cap_retransmission_timer_update(struct l2cap_chan_s *ch) |
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{
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#if 0
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if (ch->mode != L2CAP_MODE_BASIC && ch->rexmit)
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qemu_mod_timer(ch->retransmission_timer);
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else
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qemu_del_timer(ch->retransmission_timer);
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#endif
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} |
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static void l2cap_monitor_timer_update(struct l2cap_chan_s *ch) |
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{
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#if 0
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if (ch->mode != L2CAP_MODE_BASIC && !ch->rexmit)
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qemu_mod_timer(ch->monitor_timer);
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else
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qemu_del_timer(ch->monitor_timer);
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#endif
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} |
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static void l2cap_command_reject(struct l2cap_instance_s *l2cap, int id, |
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uint16_t reason, const void *data, int plen) |
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{
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uint8_t *pkt; |
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l2cap_cmd_hdr *hdr; |
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l2cap_cmd_rej *params; |
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uint16_t len; |
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|
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reason = cpu_to_le16(reason); |
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len = cpu_to_le16(L2CAP_CMD_REJ_SIZE + plen); |
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|
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pkt = l2cap->signalling_ch.params.sdu_out(&l2cap->signalling_ch.params, |
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L2CAP_CMD_HDR_SIZE + L2CAP_CMD_REJ_SIZE + plen); |
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hdr = (void *) (pkt + 0); |
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params = (void *) (pkt + L2CAP_CMD_HDR_SIZE);
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hdr->code = L2CAP_COMMAND_REJ; |
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hdr->ident = id; |
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memcpy(&hdr->len, &len, sizeof(hdr->len));
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memcpy(¶ms->reason, &reason, sizeof(reason));
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if (plen)
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memcpy(pkt + L2CAP_CMD_HDR_SIZE + L2CAP_CMD_REJ_SIZE, data, plen); |
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l2cap->signalling_ch.params.sdu_submit(&l2cap->signalling_ch.params); |
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} |
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static void l2cap_command_reject_cid(struct l2cap_instance_s *l2cap, int id, |
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uint16_t reason, uint16_t dcid, uint16_t scid) |
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{
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l2cap_cmd_rej_cid params = {
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.dcid = dcid, |
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.scid = scid, |
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}; |
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l2cap_command_reject(l2cap, id, reason, ¶ms, L2CAP_CMD_REJ_CID_SIZE); |
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} |
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static void l2cap_connection_response(struct l2cap_instance_s *l2cap, |
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int dcid, int scid, int result, int status) |
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{
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uint8_t *pkt; |
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l2cap_cmd_hdr *hdr; |
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l2cap_conn_rsp *params; |
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|
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pkt = l2cap->signalling_ch.params.sdu_out(&l2cap->signalling_ch.params, |
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L2CAP_CMD_HDR_SIZE + L2CAP_CONN_RSP_SIZE); |
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hdr = (void *) (pkt + 0); |
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params = (void *) (pkt + L2CAP_CMD_HDR_SIZE);
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|
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hdr->code = L2CAP_CONN_RSP; |
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hdr->ident = l2cap->last_id; |
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hdr->len = cpu_to_le16(L2CAP_CONN_RSP_SIZE); |
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|
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params->dcid = cpu_to_le16(dcid); |
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params->scid = cpu_to_le16(scid); |
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params->result = cpu_to_le16(result); |
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params->status = cpu_to_le16(status); |
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|
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l2cap->signalling_ch.params.sdu_submit(&l2cap->signalling_ch.params); |
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} |
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|
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static void l2cap_configuration_request(struct l2cap_instance_s *l2cap, |
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int dcid, int flag, const uint8_t *data, int len) |
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{
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uint8_t *pkt; |
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l2cap_cmd_hdr *hdr; |
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l2cap_conf_req *params; |
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|
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pkt = l2cap->signalling_ch.params.sdu_out(&l2cap->signalling_ch.params, |
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L2CAP_CMD_HDR_SIZE + L2CAP_CONF_REQ_SIZE(len)); |
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hdr = (void *) (pkt + 0); |
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params = (void *) (pkt + L2CAP_CMD_HDR_SIZE);
|
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|
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/* TODO: unify the id sequencing */
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l2cap->last_id = l2cap->next_id; |
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l2cap->next_id = l2cap->next_id == 255 ? 1 : l2cap->next_id + 1; |
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|
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hdr->code = L2CAP_CONF_REQ; |
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hdr->ident = l2cap->last_id; |
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hdr->len = cpu_to_le16(L2CAP_CONF_REQ_SIZE(len)); |
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params->dcid = cpu_to_le16(dcid); |
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params->flags = cpu_to_le16(flag); |
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if (len)
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memcpy(params->data, data, len); |
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l2cap->signalling_ch.params.sdu_submit(&l2cap->signalling_ch.params); |
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} |
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|
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static void l2cap_configuration_response(struct l2cap_instance_s *l2cap, |
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int scid, int flag, int result, const uint8_t *data, int len) |
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{
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uint8_t *pkt; |
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l2cap_cmd_hdr *hdr; |
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l2cap_conf_rsp *params; |
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|
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pkt = l2cap->signalling_ch.params.sdu_out(&l2cap->signalling_ch.params, |
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L2CAP_CMD_HDR_SIZE + L2CAP_CONF_RSP_SIZE(len)); |
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hdr = (void *) (pkt + 0); |
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params = (void *) (pkt + L2CAP_CMD_HDR_SIZE);
|
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|
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hdr->code = L2CAP_CONF_RSP; |
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hdr->ident = l2cap->last_id; |
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hdr->len = cpu_to_le16(L2CAP_CONF_RSP_SIZE(len)); |
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|
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params->scid = cpu_to_le16(scid); |
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params->flags = cpu_to_le16(flag); |
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params->result = cpu_to_le16(result); |
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if (len)
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memcpy(params->data, data, len); |
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|
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l2cap->signalling_ch.params.sdu_submit(&l2cap->signalling_ch.params); |
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} |
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|
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static void l2cap_disconnection_response(struct l2cap_instance_s *l2cap, |
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int dcid, int scid) |
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{
|
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uint8_t *pkt; |
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l2cap_cmd_hdr *hdr; |
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l2cap_disconn_rsp *params; |
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|
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pkt = l2cap->signalling_ch.params.sdu_out(&l2cap->signalling_ch.params, |
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L2CAP_CMD_HDR_SIZE + L2CAP_DISCONN_RSP_SIZE); |
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hdr = (void *) (pkt + 0); |
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params = (void *) (pkt + L2CAP_CMD_HDR_SIZE);
|
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|
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hdr->code = L2CAP_DISCONN_RSP; |
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hdr->ident = l2cap->last_id; |
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hdr->len = cpu_to_le16(L2CAP_DISCONN_RSP_SIZE); |
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|
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params->dcid = cpu_to_le16(dcid); |
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params->scid = cpu_to_le16(scid); |
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|
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l2cap->signalling_ch.params.sdu_submit(&l2cap->signalling_ch.params); |
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} |
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|
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static void l2cap_echo_response(struct l2cap_instance_s *l2cap, |
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const uint8_t *data, int len) |
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{
|
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uint8_t *pkt; |
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l2cap_cmd_hdr *hdr; |
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uint8_t *params; |
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|
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pkt = l2cap->signalling_ch.params.sdu_out(&l2cap->signalling_ch.params, |
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L2CAP_CMD_HDR_SIZE + len); |
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hdr = (void *) (pkt + 0); |
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params = (void *) (pkt + L2CAP_CMD_HDR_SIZE);
|
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|
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hdr->code = L2CAP_ECHO_RSP; |
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hdr->ident = l2cap->last_id; |
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hdr->len = cpu_to_le16(len); |
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|
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memcpy(params, data, len); |
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|
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l2cap->signalling_ch.params.sdu_submit(&l2cap->signalling_ch.params); |
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} |
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|
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static void l2cap_info_response(struct l2cap_instance_s *l2cap, int type, |
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int result, const uint8_t *data, int len) |
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{
|
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uint8_t *pkt; |
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l2cap_cmd_hdr *hdr; |
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l2cap_info_rsp *params; |
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|
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pkt = l2cap->signalling_ch.params.sdu_out(&l2cap->signalling_ch.params, |
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L2CAP_CMD_HDR_SIZE + L2CAP_INFO_RSP_SIZE + len); |
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hdr = (void *) (pkt + 0); |
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params = (void *) (pkt + L2CAP_CMD_HDR_SIZE);
|
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|
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hdr->code = L2CAP_INFO_RSP; |
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hdr->ident = l2cap->last_id; |
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hdr->len = cpu_to_le16(L2CAP_INFO_RSP_SIZE + len); |
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|
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params->type = cpu_to_le16(type); |
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params->result = cpu_to_le16(result); |
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if (len)
|
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memcpy(params->data, data, len); |
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|
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l2cap->signalling_ch.params.sdu_submit(&l2cap->signalling_ch.params); |
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} |
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|
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static uint8_t *l2cap_bframe_out(struct bt_l2cap_conn_params_s *parm, int len); |
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static void l2cap_bframe_submit(struct bt_l2cap_conn_params_s *parms); |
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#if 0
|
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static uint8_t *l2cap_iframe_out(struct bt_l2cap_conn_params_s *parm, int len);
|
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static void l2cap_iframe_submit(struct bt_l2cap_conn_params_s *parm);
|
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#endif
|
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static void l2cap_bframe_in(struct l2cap_chan_s *ch, uint16_t cid, |
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const l2cap_hdr *hdr, int len); |
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static void l2cap_iframe_in(struct l2cap_chan_s *ch, uint16_t cid, |
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const l2cap_hdr *hdr, int len); |
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|
| 377 |
static int l2cap_cid_new(struct l2cap_instance_s *l2cap) |
| 378 |
{
|
| 379 |
int i;
|
| 380 |
|
| 381 |
for (i = L2CAP_CID_ALLOC; i < L2CAP_CID_MAX; i ++)
|
| 382 |
if (!l2cap->cid[i])
|
| 383 |
return i;
|
| 384 |
|
| 385 |
return L2CAP_CID_INVALID;
|
| 386 |
} |
| 387 |
|
| 388 |
static inline struct bt_l2cap_psm_s *l2cap_psm( |
| 389 |
struct bt_l2cap_device_s *device, int psm) |
| 390 |
{
|
| 391 |
struct bt_l2cap_psm_s *ret = device->first_psm;
|
| 392 |
|
| 393 |
while (ret && ret->psm != psm)
|
| 394 |
ret = ret->next; |
| 395 |
|
| 396 |
return ret;
|
| 397 |
} |
| 398 |
|
| 399 |
static struct l2cap_chan_s *l2cap_channel_open(struct l2cap_instance_s *l2cap, |
| 400 |
int psm, int source_cid) |
| 401 |
{
|
| 402 |
struct l2cap_chan_s *ch = NULL; |
| 403 |
struct bt_l2cap_psm_s *psm_info;
|
| 404 |
int result, status;
|
| 405 |
int cid = l2cap_cid_new(l2cap);
|
| 406 |
|
| 407 |
if (cid) {
|
| 408 |
/* See what the channel is to be used for.. */
|
| 409 |
psm_info = l2cap_psm(l2cap->dev, psm); |
| 410 |
|
| 411 |
if (psm_info) {
|
| 412 |
/* Device supports this use-case. */
|
| 413 |
ch = g_malloc0(sizeof(*ch));
|
| 414 |
ch->params.sdu_out = l2cap_bframe_out; |
| 415 |
ch->params.sdu_submit = l2cap_bframe_submit; |
| 416 |
ch->frame_in = l2cap_bframe_in; |
| 417 |
ch->mps = 65536;
|
| 418 |
ch->min_mtu = MAX(48, psm_info->min_mtu);
|
| 419 |
ch->params.remote_mtu = MAX(672, ch->min_mtu);
|
| 420 |
ch->remote_cid = source_cid; |
| 421 |
ch->mode = L2CAP_MODE_BASIC; |
| 422 |
ch->l2cap = l2cap; |
| 423 |
|
| 424 |
/* Does it feel like opening yet another channel though? */
|
| 425 |
if (!psm_info->new_channel(l2cap->dev, &ch->params)) {
|
| 426 |
l2cap->cid[cid] = ch; |
| 427 |
|
| 428 |
result = L2CAP_CR_SUCCESS; |
| 429 |
status = L2CAP_CS_NO_INFO; |
| 430 |
} else {
|
| 431 |
g_free(ch); |
| 432 |
|
| 433 |
result = L2CAP_CR_NO_MEM; |
| 434 |
status = L2CAP_CS_NO_INFO; |
| 435 |
} |
| 436 |
} else {
|
| 437 |
result = L2CAP_CR_BAD_PSM; |
| 438 |
status = L2CAP_CS_NO_INFO; |
| 439 |
} |
| 440 |
} else {
|
| 441 |
result = L2CAP_CR_NO_MEM; |
| 442 |
status = L2CAP_CS_NO_INFO; |
| 443 |
} |
| 444 |
|
| 445 |
l2cap_connection_response(l2cap, cid, source_cid, result, status); |
| 446 |
|
| 447 |
return ch;
|
| 448 |
} |
| 449 |
|
| 450 |
static void l2cap_channel_close(struct l2cap_instance_s *l2cap, |
| 451 |
int cid, int source_cid) |
| 452 |
{
|
| 453 |
struct l2cap_chan_s *ch = NULL; |
| 454 |
|
| 455 |
/* According to Volume 3, section 6.1.1, pg 1048 of BT Core V2.0, a
|
| 456 |
* connection in CLOSED state still responds with a L2CAP_DisconnectRsp
|
| 457 |
* message on an L2CAP_DisconnectReq event. */
|
| 458 |
if (unlikely(cid < L2CAP_CID_ALLOC)) {
|
| 459 |
l2cap_command_reject_cid(l2cap, l2cap->last_id, L2CAP_REJ_CID_INVAL, |
| 460 |
cid, source_cid); |
| 461 |
return;
|
| 462 |
} |
| 463 |
if (likely(cid >= L2CAP_CID_ALLOC && cid < L2CAP_CID_MAX))
|
| 464 |
ch = l2cap->cid[cid]; |
| 465 |
|
| 466 |
if (likely(ch)) {
|
| 467 |
if (ch->remote_cid != source_cid) {
|
| 468 |
fprintf(stderr, "%s: Ignoring a Disconnection Request with the "
|
| 469 |
"invalid SCID %04x.\n", __FUNCTION__, source_cid);
|
| 470 |
return;
|
| 471 |
} |
| 472 |
|
| 473 |
l2cap->cid[cid] = NULL;
|
| 474 |
|
| 475 |
ch->params.close(ch->params.opaque); |
| 476 |
g_free(ch); |
| 477 |
} |
| 478 |
|
| 479 |
l2cap_disconnection_response(l2cap, cid, source_cid); |
| 480 |
} |
| 481 |
|
| 482 |
static void l2cap_channel_config_null(struct l2cap_instance_s *l2cap, |
| 483 |
struct l2cap_chan_s *ch)
|
| 484 |
{
|
| 485 |
l2cap_configuration_request(l2cap, ch->remote_cid, 0, NULL, 0); |
| 486 |
ch->config_req_id = l2cap->last_id; |
| 487 |
ch->config &= ~L2CAP_CFG_INIT; |
| 488 |
} |
| 489 |
|
| 490 |
static void l2cap_channel_config_req_event(struct l2cap_instance_s *l2cap, |
| 491 |
struct l2cap_chan_s *ch)
|
| 492 |
{
|
| 493 |
/* Use all default channel options and terminate negotiation. */
|
| 494 |
l2cap_channel_config_null(l2cap, ch); |
| 495 |
} |
| 496 |
|
| 497 |
static int l2cap_channel_config(struct l2cap_instance_s *l2cap, |
| 498 |
struct l2cap_chan_s *ch, int flag, |
| 499 |
const uint8_t *data, int len) |
| 500 |
{
|
| 501 |
l2cap_conf_opt *opt; |
| 502 |
l2cap_conf_opt_qos *qos; |
| 503 |
uint32_t val; |
| 504 |
uint8_t rsp[len]; |
| 505 |
int result = L2CAP_CONF_SUCCESS;
|
| 506 |
|
| 507 |
data = memcpy(rsp, data, len); |
| 508 |
while (len) {
|
| 509 |
opt = (void *) data;
|
| 510 |
|
| 511 |
if (len < L2CAP_CONF_OPT_SIZE ||
|
| 512 |
len < L2CAP_CONF_OPT_SIZE + opt->len) {
|
| 513 |
result = L2CAP_CONF_REJECT; |
| 514 |
break;
|
| 515 |
} |
| 516 |
data += L2CAP_CONF_OPT_SIZE + opt->len; |
| 517 |
len -= L2CAP_CONF_OPT_SIZE + opt->len; |
| 518 |
|
| 519 |
switch (opt->type & 0x7f) { |
| 520 |
case L2CAP_CONF_MTU:
|
| 521 |
if (opt->len != 2) { |
| 522 |
result = L2CAP_CONF_REJECT; |
| 523 |
break;
|
| 524 |
} |
| 525 |
|
| 526 |
/* MTU */
|
| 527 |
val = le16_to_cpup((void *) opt->val);
|
| 528 |
if (val < ch->min_mtu) {
|
| 529 |
cpu_to_le16w((void *) opt->val, ch->min_mtu);
|
| 530 |
result = L2CAP_CONF_UNACCEPT; |
| 531 |
break;
|
| 532 |
} |
| 533 |
|
| 534 |
ch->params.remote_mtu = val; |
| 535 |
break;
|
| 536 |
|
| 537 |
case L2CAP_CONF_FLUSH_TO:
|
| 538 |
if (opt->len != 2) { |
| 539 |
result = L2CAP_CONF_REJECT; |
| 540 |
break;
|
| 541 |
} |
| 542 |
|
| 543 |
/* Flush Timeout */
|
| 544 |
val = le16_to_cpup((void *) opt->val);
|
| 545 |
if (val < 0x0001) { |
| 546 |
opt->val[0] = 0xff; |
| 547 |
opt->val[1] = 0xff; |
| 548 |
result = L2CAP_CONF_UNACCEPT; |
| 549 |
break;
|
| 550 |
} |
| 551 |
break;
|
| 552 |
|
| 553 |
case L2CAP_CONF_QOS:
|
| 554 |
if (opt->len != L2CAP_CONF_OPT_QOS_SIZE) {
|
| 555 |
result = L2CAP_CONF_REJECT; |
| 556 |
break;
|
| 557 |
} |
| 558 |
qos = (void *) opt->val;
|
| 559 |
|
| 560 |
/* Flags */
|
| 561 |
val = qos->flags; |
| 562 |
if (val) {
|
| 563 |
qos->flags = 0;
|
| 564 |
result = L2CAP_CONF_UNACCEPT; |
| 565 |
} |
| 566 |
|
| 567 |
/* Service type */
|
| 568 |
val = qos->service_type; |
| 569 |
if (val != L2CAP_CONF_QOS_BEST_EFFORT &&
|
| 570 |
val != L2CAP_CONF_QOS_NO_TRAFFIC) {
|
| 571 |
qos->service_type = L2CAP_CONF_QOS_BEST_EFFORT; |
| 572 |
result = L2CAP_CONF_UNACCEPT; |
| 573 |
} |
| 574 |
|
| 575 |
if (val != L2CAP_CONF_QOS_NO_TRAFFIC) {
|
| 576 |
/* XXX: These values should possibly be calculated
|
| 577 |
* based on LM / baseband properties also. */
|
| 578 |
|
| 579 |
/* Token rate */
|
| 580 |
val = le32_to_cpu(qos->token_rate); |
| 581 |
if (val == L2CAP_CONF_QOS_WILDCARD)
|
| 582 |
qos->token_rate = cpu_to_le32(0x100000);
|
| 583 |
|
| 584 |
/* Token bucket size */
|
| 585 |
val = le32_to_cpu(qos->token_bucket_size); |
| 586 |
if (val == L2CAP_CONF_QOS_WILDCARD)
|
| 587 |
qos->token_bucket_size = cpu_to_le32(65500);
|
| 588 |
|
| 589 |
/* Any Peak bandwidth value is correct to return as-is */
|
| 590 |
/* Any Access latency value is correct to return as-is */
|
| 591 |
/* Any Delay variation value is correct to return as-is */
|
| 592 |
} |
| 593 |
break;
|
| 594 |
|
| 595 |
case L2CAP_CONF_RFC:
|
| 596 |
if (opt->len != 9) { |
| 597 |
result = L2CAP_CONF_REJECT; |
| 598 |
break;
|
| 599 |
} |
| 600 |
|
| 601 |
/* Mode */
|
| 602 |
val = opt->val[0];
|
| 603 |
switch (val) {
|
| 604 |
case L2CAP_MODE_BASIC:
|
| 605 |
ch->mode = val; |
| 606 |
ch->frame_in = l2cap_bframe_in; |
| 607 |
|
| 608 |
/* All other parameters shall be ignored */
|
| 609 |
break;
|
| 610 |
|
| 611 |
case L2CAP_MODE_RETRANS:
|
| 612 |
case L2CAP_MODE_FLOWCTL:
|
| 613 |
ch->mode = val; |
| 614 |
ch->frame_in = l2cap_iframe_in; |
| 615 |
/* Note: most of these parameters refer to incoming traffic
|
| 616 |
* so we don't need to save them as long as we can accept
|
| 617 |
* incoming PDUs at any values of the parameters. */
|
| 618 |
|
| 619 |
/* TxWindow size */
|
| 620 |
val = opt->val[1];
|
| 621 |
if (val < 1 || val > 32) { |
| 622 |
opt->val[1] = 32; |
| 623 |
result = L2CAP_CONF_UNACCEPT; |
| 624 |
break;
|
| 625 |
} |
| 626 |
|
| 627 |
/* MaxTransmit */
|
| 628 |
val = opt->val[2];
|
| 629 |
if (val < 1) { |
| 630 |
opt->val[2] = 1; |
| 631 |
result = L2CAP_CONF_UNACCEPT; |
| 632 |
break;
|
| 633 |
} |
| 634 |
|
| 635 |
/* Remote Retransmission time-out shouldn't affect local
|
| 636 |
* operation (?) */
|
| 637 |
|
| 638 |
/* The Monitor time-out drives the local Monitor timer (?),
|
| 639 |
* so save the value. */
|
| 640 |
val = (opt->val[6] << 8) | opt->val[5]; |
| 641 |
if (val < 30) { |
| 642 |
opt->val[5] = 100 & 0xff; |
| 643 |
opt->val[6] = 100 >> 8; |
| 644 |
result = L2CAP_CONF_UNACCEPT; |
| 645 |
break;
|
| 646 |
} |
| 647 |
ch->monitor_timeout = val; |
| 648 |
l2cap_monitor_timer_update(ch); |
| 649 |
|
| 650 |
/* MPS */
|
| 651 |
val = (opt->val[8] << 8) | opt->val[7]; |
| 652 |
if (val < ch->min_mtu) {
|
| 653 |
opt->val[7] = ch->min_mtu & 0xff; |
| 654 |
opt->val[8] = ch->min_mtu >> 8; |
| 655 |
result = L2CAP_CONF_UNACCEPT; |
| 656 |
break;
|
| 657 |
} |
| 658 |
ch->mps = val; |
| 659 |
break;
|
| 660 |
|
| 661 |
default:
|
| 662 |
result = L2CAP_CONF_UNACCEPT; |
| 663 |
break;
|
| 664 |
} |
| 665 |
break;
|
| 666 |
|
| 667 |
default:
|
| 668 |
if (!(opt->type >> 7)) |
| 669 |
result = L2CAP_CONF_UNKNOWN; |
| 670 |
break;
|
| 671 |
} |
| 672 |
|
| 673 |
if (result != L2CAP_CONF_SUCCESS)
|
| 674 |
break; /* XXX: should continue? */ |
| 675 |
} |
| 676 |
|
| 677 |
l2cap_configuration_response(l2cap, ch->remote_cid, |
| 678 |
flag, result, rsp, len); |
| 679 |
|
| 680 |
return result == L2CAP_CONF_SUCCESS && !flag;
|
| 681 |
} |
| 682 |
|
| 683 |
static void l2cap_channel_config_req_msg(struct l2cap_instance_s *l2cap, |
| 684 |
int flag, int cid, const uint8_t *data, int len) |
| 685 |
{
|
| 686 |
struct l2cap_chan_s *ch;
|
| 687 |
|
| 688 |
if (unlikely(cid >= L2CAP_CID_MAX || !l2cap->cid[cid])) {
|
| 689 |
l2cap_command_reject_cid(l2cap, l2cap->last_id, L2CAP_REJ_CID_INVAL, |
| 690 |
cid, 0x0000);
|
| 691 |
return;
|
| 692 |
} |
| 693 |
ch = l2cap->cid[cid]; |
| 694 |
|
| 695 |
/* From OPEN go to WAIT_CONFIG_REQ and from WAIT_CONFIG_REQ_RSP to
|
| 696 |
* WAIT_CONFIG_REQ_RSP. This is assuming the transition chart for OPEN
|
| 697 |
* on pg 1053, section 6.1.5, volume 3 of BT Core V2.0 has a mistake
|
| 698 |
* and on options-acceptable we go back to OPEN and otherwise to
|
| 699 |
* WAIT_CONFIG_REQ and not the other way. */
|
| 700 |
ch->config &= ~L2CAP_CFG_ACC; |
| 701 |
|
| 702 |
if (l2cap_channel_config(l2cap, ch, flag, data, len))
|
| 703 |
/* Go to OPEN or WAIT_CONFIG_RSP */
|
| 704 |
ch->config |= L2CAP_CFG_ACC; |
| 705 |
|
| 706 |
/* TODO: if the incoming traffic flow control or retransmission mode
|
| 707 |
* changed then we probably need to also generate the
|
| 708 |
* ConfigureChannel_Req event and set the outgoing traffic to the same
|
| 709 |
* mode. */
|
| 710 |
if (!(ch->config & L2CAP_CFG_INIT) && (ch->config & L2CAP_CFG_ACC) &&
|
| 711 |
!ch->config_req_id) |
| 712 |
l2cap_channel_config_req_event(l2cap, ch); |
| 713 |
} |
| 714 |
|
| 715 |
static int l2cap_channel_config_rsp_msg(struct l2cap_instance_s *l2cap, |
| 716 |
int result, int flag, int cid, const uint8_t *data, int len) |
| 717 |
{
|
| 718 |
struct l2cap_chan_s *ch;
|
| 719 |
|
| 720 |
if (unlikely(cid >= L2CAP_CID_MAX || !l2cap->cid[cid])) {
|
| 721 |
l2cap_command_reject_cid(l2cap, l2cap->last_id, L2CAP_REJ_CID_INVAL, |
| 722 |
cid, 0x0000);
|
| 723 |
return 0; |
| 724 |
} |
| 725 |
ch = l2cap->cid[cid]; |
| 726 |
|
| 727 |
if (ch->config_req_id != l2cap->last_id)
|
| 728 |
return 1; |
| 729 |
ch->config_req_id = 0;
|
| 730 |
|
| 731 |
if (result == L2CAP_CONF_SUCCESS) {
|
| 732 |
if (!flag)
|
| 733 |
ch->config |= L2CAP_CFG_INIT; |
| 734 |
else
|
| 735 |
l2cap_channel_config_null(l2cap, ch); |
| 736 |
} else
|
| 737 |
/* Retry until we succeed */
|
| 738 |
l2cap_channel_config_req_event(l2cap, ch); |
| 739 |
|
| 740 |
return 0; |
| 741 |
} |
| 742 |
|
| 743 |
static void l2cap_channel_open_req_msg(struct l2cap_instance_s *l2cap, |
| 744 |
int psm, int source_cid) |
| 745 |
{
|
| 746 |
struct l2cap_chan_s *ch = l2cap_channel_open(l2cap, psm, source_cid);
|
| 747 |
|
| 748 |
if (!ch)
|
| 749 |
return;
|
| 750 |
|
| 751 |
/* Optional */
|
| 752 |
if (!(ch->config & L2CAP_CFG_INIT) && !ch->config_req_id)
|
| 753 |
l2cap_channel_config_req_event(l2cap, ch); |
| 754 |
} |
| 755 |
|
| 756 |
static void l2cap_info(struct l2cap_instance_s *l2cap, int type) |
| 757 |
{
|
| 758 |
uint8_t data[4];
|
| 759 |
int len = 0; |
| 760 |
int result = L2CAP_IR_SUCCESS;
|
| 761 |
|
| 762 |
switch (type) {
|
| 763 |
case L2CAP_IT_CL_MTU:
|
| 764 |
data[len ++] = l2cap->group_ch.mps & 0xff;
|
| 765 |
data[len ++] = l2cap->group_ch.mps >> 8;
|
| 766 |
break;
|
| 767 |
|
| 768 |
case L2CAP_IT_FEAT_MASK:
|
| 769 |
/* (Prematurely) report Flow control and Retransmission modes. */
|
| 770 |
data[len ++] = 0x03;
|
| 771 |
data[len ++] = 0x00;
|
| 772 |
data[len ++] = 0x00;
|
| 773 |
data[len ++] = 0x00;
|
| 774 |
break;
|
| 775 |
|
| 776 |
default:
|
| 777 |
result = L2CAP_IR_NOTSUPP; |
| 778 |
} |
| 779 |
|
| 780 |
l2cap_info_response(l2cap, type, result, data, len); |
| 781 |
} |
| 782 |
|
| 783 |
static void l2cap_command(struct l2cap_instance_s *l2cap, int code, int id, |
| 784 |
const uint8_t *params, int len) |
| 785 |
{
|
| 786 |
int err;
|
| 787 |
|
| 788 |
#if 0
|
| 789 |
/* TODO: do the IDs really have to be in sequence? */
|
| 790 |
if (!id || (id != l2cap->last_id && id != l2cap->next_id)) {
|
| 791 |
fprintf(stderr, "%s: out of sequence command packet ignored.\n",
|
| 792 |
__FUNCTION__);
|
| 793 |
return;
|
| 794 |
}
|
| 795 |
#else
|
| 796 |
l2cap->next_id = id; |
| 797 |
#endif
|
| 798 |
if (id == l2cap->next_id) {
|
| 799 |
l2cap->last_id = l2cap->next_id; |
| 800 |
l2cap->next_id = l2cap->next_id == 255 ? 1 : l2cap->next_id + 1; |
| 801 |
} else {
|
| 802 |
/* TODO: Need to re-send the same response, without re-executing
|
| 803 |
* the corresponding command! */
|
| 804 |
} |
| 805 |
|
| 806 |
switch (code) {
|
| 807 |
case L2CAP_COMMAND_REJ:
|
| 808 |
if (unlikely(len != 2 && len != 4 && len != 6)) { |
| 809 |
err = L2CAP_REJ_CMD_NOT_UNDERSTOOD; |
| 810 |
goto reject;
|
| 811 |
} |
| 812 |
|
| 813 |
/* We never issue commands other than Command Reject currently. */
|
| 814 |
fprintf(stderr, "%s: stray Command Reject (%02x, %04x) "
|
| 815 |
"packet, ignoring.\n", __FUNCTION__, id,
|
| 816 |
le16_to_cpu(((l2cap_cmd_rej *) params)->reason)); |
| 817 |
break;
|
| 818 |
|
| 819 |
case L2CAP_CONN_REQ:
|
| 820 |
if (unlikely(len != L2CAP_CONN_REQ_SIZE)) {
|
| 821 |
err = L2CAP_REJ_CMD_NOT_UNDERSTOOD; |
| 822 |
goto reject;
|
| 823 |
} |
| 824 |
|
| 825 |
l2cap_channel_open_req_msg(l2cap, |
| 826 |
le16_to_cpu(((l2cap_conn_req *) params)->psm), |
| 827 |
le16_to_cpu(((l2cap_conn_req *) params)->scid)); |
| 828 |
break;
|
| 829 |
|
| 830 |
case L2CAP_CONN_RSP:
|
| 831 |
if (unlikely(len != L2CAP_CONN_RSP_SIZE)) {
|
| 832 |
err = L2CAP_REJ_CMD_NOT_UNDERSTOOD; |
| 833 |
goto reject;
|
| 834 |
} |
| 835 |
|
| 836 |
/* We never issue Connection Requests currently. TODO */
|
| 837 |
fprintf(stderr, "%s: unexpected Connection Response (%02x) "
|
| 838 |
"packet, ignoring.\n", __FUNCTION__, id);
|
| 839 |
break;
|
| 840 |
|
| 841 |
case L2CAP_CONF_REQ:
|
| 842 |
if (unlikely(len < L2CAP_CONF_REQ_SIZE(0))) { |
| 843 |
err = L2CAP_REJ_CMD_NOT_UNDERSTOOD; |
| 844 |
goto reject;
|
| 845 |
} |
| 846 |
|
| 847 |
l2cap_channel_config_req_msg(l2cap, |
| 848 |
le16_to_cpu(((l2cap_conf_req *) params)->flags) & 1,
|
| 849 |
le16_to_cpu(((l2cap_conf_req *) params)->dcid), |
| 850 |
((l2cap_conf_req *) params)->data, |
| 851 |
len - L2CAP_CONF_REQ_SIZE(0));
|
| 852 |
break;
|
| 853 |
|
| 854 |
case L2CAP_CONF_RSP:
|
| 855 |
if (unlikely(len < L2CAP_CONF_RSP_SIZE(0))) { |
| 856 |
err = L2CAP_REJ_CMD_NOT_UNDERSTOOD; |
| 857 |
goto reject;
|
| 858 |
} |
| 859 |
|
| 860 |
if (l2cap_channel_config_rsp_msg(l2cap,
|
| 861 |
le16_to_cpu(((l2cap_conf_rsp *) params)->result), |
| 862 |
le16_to_cpu(((l2cap_conf_rsp *) params)->flags) & 1,
|
| 863 |
le16_to_cpu(((l2cap_conf_rsp *) params)->scid), |
| 864 |
((l2cap_conf_rsp *) params)->data, |
| 865 |
len - L2CAP_CONF_RSP_SIZE(0)))
|
| 866 |
fprintf(stderr, "%s: unexpected Configure Response (%02x) "
|
| 867 |
"packet, ignoring.\n", __FUNCTION__, id);
|
| 868 |
break;
|
| 869 |
|
| 870 |
case L2CAP_DISCONN_REQ:
|
| 871 |
if (unlikely(len != L2CAP_DISCONN_REQ_SIZE)) {
|
| 872 |
err = L2CAP_REJ_CMD_NOT_UNDERSTOOD; |
| 873 |
goto reject;
|
| 874 |
} |
| 875 |
|
| 876 |
l2cap_channel_close(l2cap, |
| 877 |
le16_to_cpu(((l2cap_disconn_req *) params)->dcid), |
| 878 |
le16_to_cpu(((l2cap_disconn_req *) params)->scid)); |
| 879 |
break;
|
| 880 |
|
| 881 |
case L2CAP_DISCONN_RSP:
|
| 882 |
if (unlikely(len != L2CAP_DISCONN_RSP_SIZE)) {
|
| 883 |
err = L2CAP_REJ_CMD_NOT_UNDERSTOOD; |
| 884 |
goto reject;
|
| 885 |
} |
| 886 |
|
| 887 |
/* We never issue Disconnection Requests currently. TODO */
|
| 888 |
fprintf(stderr, "%s: unexpected Disconnection Response (%02x) "
|
| 889 |
"packet, ignoring.\n", __FUNCTION__, id);
|
| 890 |
break;
|
| 891 |
|
| 892 |
case L2CAP_ECHO_REQ:
|
| 893 |
l2cap_echo_response(l2cap, params, len); |
| 894 |
break;
|
| 895 |
|
| 896 |
case L2CAP_ECHO_RSP:
|
| 897 |
/* We never issue Echo Requests currently. TODO */
|
| 898 |
fprintf(stderr, "%s: unexpected Echo Response (%02x) "
|
| 899 |
"packet, ignoring.\n", __FUNCTION__, id);
|
| 900 |
break;
|
| 901 |
|
| 902 |
case L2CAP_INFO_REQ:
|
| 903 |
if (unlikely(len != L2CAP_INFO_REQ_SIZE)) {
|
| 904 |
err = L2CAP_REJ_CMD_NOT_UNDERSTOOD; |
| 905 |
goto reject;
|
| 906 |
} |
| 907 |
|
| 908 |
l2cap_info(l2cap, le16_to_cpu(((l2cap_info_req *) params)->type)); |
| 909 |
break;
|
| 910 |
|
| 911 |
case L2CAP_INFO_RSP:
|
| 912 |
if (unlikely(len != L2CAP_INFO_RSP_SIZE)) {
|
| 913 |
err = L2CAP_REJ_CMD_NOT_UNDERSTOOD; |
| 914 |
goto reject;
|
| 915 |
} |
| 916 |
|
| 917 |
/* We never issue Information Requests currently. TODO */
|
| 918 |
fprintf(stderr, "%s: unexpected Information Response (%02x) "
|
| 919 |
"packet, ignoring.\n", __FUNCTION__, id);
|
| 920 |
break;
|
| 921 |
|
| 922 |
default:
|
| 923 |
err = L2CAP_REJ_CMD_NOT_UNDERSTOOD; |
| 924 |
reject:
|
| 925 |
l2cap_command_reject(l2cap, id, err, 0, 0); |
| 926 |
break;
|
| 927 |
} |
| 928 |
} |
| 929 |
|
| 930 |
static void l2cap_rexmit_enable(struct l2cap_chan_s *ch, int enable) |
| 931 |
{
|
| 932 |
ch->rexmit = enable; |
| 933 |
|
| 934 |
l2cap_retransmission_timer_update(ch); |
| 935 |
l2cap_monitor_timer_update(ch); |
| 936 |
} |
| 937 |
|
| 938 |
/* Command frame SDU */
|
| 939 |
static void l2cap_cframe_in(void *opaque, const uint8_t *data, int len) |
| 940 |
{
|
| 941 |
struct l2cap_instance_s *l2cap = opaque;
|
| 942 |
const l2cap_cmd_hdr *hdr;
|
| 943 |
int clen;
|
| 944 |
|
| 945 |
while (len) {
|
| 946 |
hdr = (void *) data;
|
| 947 |
if (len < L2CAP_CMD_HDR_SIZE)
|
| 948 |
/* TODO: signal an error */
|
| 949 |
return;
|
| 950 |
len -= L2CAP_CMD_HDR_SIZE; |
| 951 |
data += L2CAP_CMD_HDR_SIZE; |
| 952 |
|
| 953 |
clen = le16_to_cpu(hdr->len); |
| 954 |
if (len < clen) {
|
| 955 |
l2cap_command_reject(l2cap, hdr->ident, |
| 956 |
L2CAP_REJ_CMD_NOT_UNDERSTOOD, 0, 0); |
| 957 |
break;
|
| 958 |
} |
| 959 |
|
| 960 |
l2cap_command(l2cap, hdr->code, hdr->ident, data, clen); |
| 961 |
len -= clen; |
| 962 |
data += clen; |
| 963 |
} |
| 964 |
} |
| 965 |
|
| 966 |
/* Group frame SDU */
|
| 967 |
static void l2cap_gframe_in(void *opaque, const uint8_t *data, int len) |
| 968 |
{
|
| 969 |
} |
| 970 |
|
| 971 |
/* Supervisory frame */
|
| 972 |
static void l2cap_sframe_in(struct l2cap_chan_s *ch, uint16_t ctrl) |
| 973 |
{
|
| 974 |
} |
| 975 |
|
| 976 |
/* Basic L2CAP mode Information frame */
|
| 977 |
static void l2cap_bframe_in(struct l2cap_chan_s *ch, uint16_t cid, |
| 978 |
const l2cap_hdr *hdr, int len) |
| 979 |
{
|
| 980 |
/* We have a full SDU, no further processing */
|
| 981 |
ch->params.sdu_in(ch->params.opaque, hdr->data, len); |
| 982 |
} |
| 983 |
|
| 984 |
/* Flow Control and Retransmission mode frame */
|
| 985 |
static void l2cap_iframe_in(struct l2cap_chan_s *ch, uint16_t cid, |
| 986 |
const l2cap_hdr *hdr, int len) |
| 987 |
{
|
| 988 |
uint16_t fcs = le16_to_cpup((void *) (hdr->data + len - 2)); |
| 989 |
|
| 990 |
if (len < 4) |
| 991 |
goto len_error;
|
| 992 |
if (l2cap_fcs16((const uint8_t *) hdr, L2CAP_HDR_SIZE + len - 2) != fcs) |
| 993 |
goto fcs_error;
|
| 994 |
|
| 995 |
if ((hdr->data[0] >> 7) == ch->rexmit) |
| 996 |
l2cap_rexmit_enable(ch, !(hdr->data[0] >> 7)); |
| 997 |
|
| 998 |
if (hdr->data[0] & 1) { |
| 999 |
if (len != 4) { |
| 1000 |
/* TODO: Signal an error? */
|
| 1001 |
return;
|
| 1002 |
} |
| 1003 |
return l2cap_sframe_in(ch, le16_to_cpup((void *) hdr->data)); |
| 1004 |
} |
| 1005 |
|
| 1006 |
switch (hdr->data[1] >> 6) { /* SAR */ |
| 1007 |
case L2CAP_SAR_NO_SEG:
|
| 1008 |
if (ch->len_total)
|
| 1009 |
goto seg_error;
|
| 1010 |
if (len - 4 > ch->mps) |
| 1011 |
goto len_error;
|
| 1012 |
|
| 1013 |
return ch->params.sdu_in(ch->params.opaque, hdr->data + 2, len - 4); |
| 1014 |
|
| 1015 |
case L2CAP_SAR_START:
|
| 1016 |
if (ch->len_total || len < 6) |
| 1017 |
goto seg_error;
|
| 1018 |
if (len - 6 > ch->mps) |
| 1019 |
goto len_error;
|
| 1020 |
|
| 1021 |
ch->len_total = le16_to_cpup((void *) (hdr->data + 2)); |
| 1022 |
if (len >= 6 + ch->len_total) |
| 1023 |
goto seg_error;
|
| 1024 |
|
| 1025 |
ch->len_cur = len - 6;
|
| 1026 |
memcpy(ch->sdu, hdr->data + 4, ch->len_cur);
|
| 1027 |
break;
|
| 1028 |
|
| 1029 |
case L2CAP_SAR_END:
|
| 1030 |
if (!ch->len_total || ch->len_cur + len - 4 < ch->len_total) |
| 1031 |
goto seg_error;
|
| 1032 |
if (len - 4 > ch->mps) |
| 1033 |
goto len_error;
|
| 1034 |
|
| 1035 |
memcpy(ch->sdu + ch->len_cur, hdr->data + 2, len - 4); |
| 1036 |
return ch->params.sdu_in(ch->params.opaque, ch->sdu, ch->len_total);
|
| 1037 |
|
| 1038 |
case L2CAP_SAR_CONT:
|
| 1039 |
if (!ch->len_total || ch->len_cur + len - 4 >= ch->len_total) |
| 1040 |
goto seg_error;
|
| 1041 |
if (len - 4 > ch->mps) |
| 1042 |
goto len_error;
|
| 1043 |
|
| 1044 |
memcpy(ch->sdu + ch->len_cur, hdr->data + 2, len - 4); |
| 1045 |
ch->len_cur += len - 4;
|
| 1046 |
break;
|
| 1047 |
|
| 1048 |
seg_error:
|
| 1049 |
len_error: /* TODO */ |
| 1050 |
fcs_error: /* TODO */ |
| 1051 |
ch->len_cur = 0;
|
| 1052 |
ch->len_total = 0;
|
| 1053 |
break;
|
| 1054 |
} |
| 1055 |
} |
| 1056 |
|
| 1057 |
static void l2cap_frame_in(struct l2cap_instance_s *l2cap, |
| 1058 |
const l2cap_hdr *frame)
|
| 1059 |
{
|
| 1060 |
uint16_t cid = le16_to_cpu(frame->cid); |
| 1061 |
uint16_t len = le16_to_cpu(frame->len); |
| 1062 |
|
| 1063 |
if (unlikely(cid >= L2CAP_CID_MAX || !l2cap->cid[cid])) {
|
| 1064 |
fprintf(stderr, "%s: frame addressed to a non-existent L2CAP "
|
| 1065 |
"channel %04x received.\n", __FUNCTION__, cid);
|
| 1066 |
return;
|
| 1067 |
} |
| 1068 |
|
| 1069 |
l2cap->cid[cid]->frame_in(l2cap->cid[cid], cid, frame, len); |
| 1070 |
} |
| 1071 |
|
| 1072 |
/* "Recombination" */
|
| 1073 |
static void l2cap_pdu_in(struct l2cap_instance_s *l2cap, |
| 1074 |
const uint8_t *data, int len) |
| 1075 |
{
|
| 1076 |
const l2cap_hdr *hdr = (void *) l2cap->frame_in; |
| 1077 |
|
| 1078 |
if (unlikely(len + l2cap->frame_in_len > sizeof(l2cap->frame_in))) { |
| 1079 |
if (l2cap->frame_in_len < sizeof(l2cap->frame_in)) { |
| 1080 |
memcpy(l2cap->frame_in + l2cap->frame_in_len, data, |
| 1081 |
sizeof(l2cap->frame_in) - l2cap->frame_in_len);
|
| 1082 |
l2cap->frame_in_len = sizeof(l2cap->frame_in);
|
| 1083 |
/* TODO: truncate */
|
| 1084 |
l2cap_frame_in(l2cap, hdr); |
| 1085 |
} |
| 1086 |
|
| 1087 |
return;
|
| 1088 |
} |
| 1089 |
|
| 1090 |
memcpy(l2cap->frame_in + l2cap->frame_in_len, data, len); |
| 1091 |
l2cap->frame_in_len += len; |
| 1092 |
|
| 1093 |
if (len >= L2CAP_HDR_SIZE)
|
| 1094 |
if (len >= L2CAP_HDR_SIZE + le16_to_cpu(hdr->len))
|
| 1095 |
l2cap_frame_in(l2cap, hdr); |
| 1096 |
/* There is never a start of a new PDU in the same ACL packet, so
|
| 1097 |
* no need to memmove the remaining payload and loop. */
|
| 1098 |
} |
| 1099 |
|
| 1100 |
static inline uint8_t *l2cap_pdu_out(struct l2cap_instance_s *l2cap, |
| 1101 |
uint16_t cid, uint16_t len) |
| 1102 |
{
|
| 1103 |
l2cap_hdr *hdr = (void *) l2cap->frame_out;
|
| 1104 |
|
| 1105 |
l2cap->frame_out_len = len + L2CAP_HDR_SIZE; |
| 1106 |
|
| 1107 |
hdr->cid = cpu_to_le16(cid); |
| 1108 |
hdr->len = cpu_to_le16(len); |
| 1109 |
|
| 1110 |
return l2cap->frame_out + L2CAP_HDR_SIZE;
|
| 1111 |
} |
| 1112 |
|
| 1113 |
static inline void l2cap_pdu_submit(struct l2cap_instance_s *l2cap) |
| 1114 |
{
|
| 1115 |
/* TODO: Fragmentation */
|
| 1116 |
(l2cap->role ? |
| 1117 |
l2cap->link->slave->lmp_acl_data : l2cap->link->host->lmp_acl_resp) |
| 1118 |
(l2cap->link, l2cap->frame_out, 1, l2cap->frame_out_len);
|
| 1119 |
} |
| 1120 |
|
| 1121 |
static uint8_t *l2cap_bframe_out(struct bt_l2cap_conn_params_s *parm, int len) |
| 1122 |
{
|
| 1123 |
struct l2cap_chan_s *chan = (struct l2cap_chan_s *) parm; |
| 1124 |
|
| 1125 |
if (len > chan->params.remote_mtu) {
|
| 1126 |
fprintf(stderr, "%s: B-Frame for CID %04x longer than %i octets.\n",
|
| 1127 |
__FUNCTION__, |
| 1128 |
chan->remote_cid, chan->params.remote_mtu); |
| 1129 |
exit(-1);
|
| 1130 |
} |
| 1131 |
|
| 1132 |
return l2cap_pdu_out(chan->l2cap, chan->remote_cid, len);
|
| 1133 |
} |
| 1134 |
|
| 1135 |
static void l2cap_bframe_submit(struct bt_l2cap_conn_params_s *parms) |
| 1136 |
{
|
| 1137 |
struct l2cap_chan_s *chan = (struct l2cap_chan_s *) parms; |
| 1138 |
|
| 1139 |
return l2cap_pdu_submit(chan->l2cap);
|
| 1140 |
} |
| 1141 |
|
| 1142 |
#if 0
|
| 1143 |
/* Stub: Only used if an emulated device requests outgoing flow control */
|
| 1144 |
static uint8_t *l2cap_iframe_out(struct bt_l2cap_conn_params_s *parm, int len)
|
| 1145 |
{
|
| 1146 |
struct l2cap_chan_s *chan = (struct l2cap_chan_s *) parm;
|
| 1147 |
|
| 1148 |
if (len > chan->params.remote_mtu) {
|
| 1149 |
/* TODO: slice into segments and queue each segment as a separate
|
| 1150 |
* I-Frame in a FIFO of I-Frames, local to the CID. */
|
| 1151 |
} else {
|
| 1152 |
/* TODO: add to the FIFO of I-Frames, local to the CID. */
|
| 1153 |
/* Possibly we need to return a pointer to a contiguous buffer
|
| 1154 |
* for now and then memcpy from it into FIFOs in l2cap_iframe_submit
|
| 1155 |
* while segmenting at the same time. */
|
| 1156 |
}
|
| 1157 |
return 0;
|
| 1158 |
}
|
| 1159 |
|
| 1160 |
static void l2cap_iframe_submit(struct bt_l2cap_conn_params_s *parm)
|
| 1161 |
{
|
| 1162 |
/* TODO: If flow control indicates clear to send, start submitting the
|
| 1163 |
* invidual I-Frames from the FIFO, but don't remove them from there.
|
| 1164 |
* Kick the appropriate timer until we get an S-Frame, and only then
|
| 1165 |
* remove from FIFO or resubmit and re-kick the timer if the timer
|
| 1166 |
* expired. */
|
| 1167 |
}
|
| 1168 |
#endif
|
| 1169 |
|
| 1170 |
static void l2cap_init(struct l2cap_instance_s *l2cap, |
| 1171 |
struct bt_link_s *link, int role) |
| 1172 |
{
|
| 1173 |
l2cap->link = link; |
| 1174 |
l2cap->role = role; |
| 1175 |
l2cap->dev = (struct bt_l2cap_device_s *)
|
| 1176 |
(role ? link->host : link->slave); |
| 1177 |
|
| 1178 |
l2cap->next_id = 1;
|
| 1179 |
|
| 1180 |
/* Establish the signalling channel */
|
| 1181 |
l2cap->signalling_ch.params.sdu_in = l2cap_cframe_in; |
| 1182 |
l2cap->signalling_ch.params.sdu_out = l2cap_bframe_out; |
| 1183 |
l2cap->signalling_ch.params.sdu_submit = l2cap_bframe_submit; |
| 1184 |
l2cap->signalling_ch.params.opaque = l2cap; |
| 1185 |
l2cap->signalling_ch.params.remote_mtu = 48;
|
| 1186 |
l2cap->signalling_ch.remote_cid = L2CAP_CID_SIGNALLING; |
| 1187 |
l2cap->signalling_ch.frame_in = l2cap_bframe_in; |
| 1188 |
l2cap->signalling_ch.mps = 65536;
|
| 1189 |
l2cap->signalling_ch.min_mtu = 48;
|
| 1190 |
l2cap->signalling_ch.mode = L2CAP_MODE_BASIC; |
| 1191 |
l2cap->signalling_ch.l2cap = l2cap; |
| 1192 |
l2cap->cid[L2CAP_CID_SIGNALLING] = &l2cap->signalling_ch; |
| 1193 |
|
| 1194 |
/* Establish the connection-less data channel */
|
| 1195 |
l2cap->group_ch.params.sdu_in = l2cap_gframe_in; |
| 1196 |
l2cap->group_ch.params.opaque = l2cap; |
| 1197 |
l2cap->group_ch.frame_in = l2cap_bframe_in; |
| 1198 |
l2cap->group_ch.mps = 65533;
|
| 1199 |
l2cap->group_ch.l2cap = l2cap; |
| 1200 |
l2cap->group_ch.remote_cid = L2CAP_CID_INVALID; |
| 1201 |
l2cap->cid[L2CAP_CID_GROUP] = &l2cap->group_ch; |
| 1202 |
} |
| 1203 |
|
| 1204 |
static void l2cap_teardown(struct l2cap_instance_s *l2cap, int send_disconnect) |
| 1205 |
{
|
| 1206 |
int cid;
|
| 1207 |
|
| 1208 |
/* Don't send DISCONNECT if we are currently handling a DISCONNECT
|
| 1209 |
* sent from the other side. */
|
| 1210 |
if (send_disconnect) {
|
| 1211 |
if (l2cap->role)
|
| 1212 |
l2cap->dev->device.lmp_disconnect_slave(l2cap->link); |
| 1213 |
/* l2cap->link is invalid from now on. */
|
| 1214 |
else
|
| 1215 |
l2cap->dev->device.lmp_disconnect_master(l2cap->link); |
| 1216 |
} |
| 1217 |
|
| 1218 |
for (cid = L2CAP_CID_ALLOC; cid < L2CAP_CID_MAX; cid ++)
|
| 1219 |
if (l2cap->cid[cid]) {
|
| 1220 |
l2cap->cid[cid]->params.close(l2cap->cid[cid]->params.opaque); |
| 1221 |
g_free(l2cap->cid[cid]); |
| 1222 |
} |
| 1223 |
|
| 1224 |
if (l2cap->role)
|
| 1225 |
g_free(l2cap); |
| 1226 |
else
|
| 1227 |
g_free(l2cap->link); |
| 1228 |
} |
| 1229 |
|
| 1230 |
/* L2CAP glue to lower layers in bluetooth stack (LMP) */
|
| 1231 |
|
| 1232 |
static void l2cap_lmp_connection_request(struct bt_link_s *link) |
| 1233 |
{
|
| 1234 |
struct bt_l2cap_device_s *dev = (struct bt_l2cap_device_s *) link->slave; |
| 1235 |
struct slave_l2cap_instance_s *l2cap;
|
| 1236 |
|
| 1237 |
/* Always accept - we only get called if (dev->device->page_scan). */
|
| 1238 |
|
| 1239 |
l2cap = g_malloc0(sizeof(struct slave_l2cap_instance_s)); |
| 1240 |
l2cap->link.slave = &dev->device; |
| 1241 |
l2cap->link.host = link->host; |
| 1242 |
l2cap_init(&l2cap->l2cap, &l2cap->link, 0);
|
| 1243 |
|
| 1244 |
/* Always at the end */
|
| 1245 |
link->host->reject_reason = 0;
|
| 1246 |
link->host->lmp_connection_complete(&l2cap->link); |
| 1247 |
} |
| 1248 |
|
| 1249 |
/* Stub */
|
| 1250 |
static void l2cap_lmp_connection_complete(struct bt_link_s *link) |
| 1251 |
{
|
| 1252 |
struct bt_l2cap_device_s *dev = (struct bt_l2cap_device_s *) link->host; |
| 1253 |
struct l2cap_instance_s *l2cap;
|
| 1254 |
|
| 1255 |
if (dev->device.reject_reason) {
|
| 1256 |
/* Signal to upper layer */
|
| 1257 |
return;
|
| 1258 |
} |
| 1259 |
|
| 1260 |
l2cap = g_malloc0(sizeof(struct l2cap_instance_s)); |
| 1261 |
l2cap_init(l2cap, link, 1);
|
| 1262 |
|
| 1263 |
link->acl_mode = acl_active; |
| 1264 |
|
| 1265 |
/* Signal to upper layer */
|
| 1266 |
} |
| 1267 |
|
| 1268 |
/* Stub */
|
| 1269 |
static void l2cap_lmp_disconnect_host(struct bt_link_s *link) |
| 1270 |
{
|
| 1271 |
struct bt_l2cap_device_s *dev = (struct bt_l2cap_device_s *) link->host; |
| 1272 |
struct l2cap_instance_s *l2cap =
|
| 1273 |
/* TODO: Retrieve from upper layer */ (void *) dev; |
| 1274 |
|
| 1275 |
/* Signal to upper layer */
|
| 1276 |
|
| 1277 |
l2cap_teardown(l2cap, 0);
|
| 1278 |
} |
| 1279 |
|
| 1280 |
static void l2cap_lmp_disconnect_slave(struct bt_link_s *link) |
| 1281 |
{
|
| 1282 |
struct slave_l2cap_instance_s *l2cap =
|
| 1283 |
(struct slave_l2cap_instance_s *) link;
|
| 1284 |
|
| 1285 |
l2cap_teardown(&l2cap->l2cap, 0);
|
| 1286 |
} |
| 1287 |
|
| 1288 |
static void l2cap_lmp_acl_data_slave(struct bt_link_s *link, |
| 1289 |
const uint8_t *data, int start, int len) |
| 1290 |
{
|
| 1291 |
struct slave_l2cap_instance_s *l2cap =
|
| 1292 |
(struct slave_l2cap_instance_s *) link;
|
| 1293 |
|
| 1294 |
if (start)
|
| 1295 |
l2cap->l2cap.frame_in_len = 0;
|
| 1296 |
|
| 1297 |
l2cap_pdu_in(&l2cap->l2cap, data, len); |
| 1298 |
} |
| 1299 |
|
| 1300 |
/* Stub */
|
| 1301 |
static void l2cap_lmp_acl_data_host(struct bt_link_s *link, |
| 1302 |
const uint8_t *data, int start, int len) |
| 1303 |
{
|
| 1304 |
struct bt_l2cap_device_s *dev = (struct bt_l2cap_device_s *) link->host; |
| 1305 |
struct l2cap_instance_s *l2cap =
|
| 1306 |
/* TODO: Retrieve from upper layer */ (void *) dev; |
| 1307 |
|
| 1308 |
if (start)
|
| 1309 |
l2cap->frame_in_len = 0;
|
| 1310 |
|
| 1311 |
l2cap_pdu_in(l2cap, data, len); |
| 1312 |
} |
| 1313 |
|
| 1314 |
static void l2cap_dummy_destroy(struct bt_device_s *dev) |
| 1315 |
{
|
| 1316 |
struct bt_l2cap_device_s *l2cap_dev = (struct bt_l2cap_device_s *) dev; |
| 1317 |
|
| 1318 |
bt_l2cap_device_done(l2cap_dev); |
| 1319 |
} |
| 1320 |
|
| 1321 |
void bt_l2cap_device_init(struct bt_l2cap_device_s *dev, |
| 1322 |
struct bt_scatternet_s *net)
|
| 1323 |
{
|
| 1324 |
bt_device_init(&dev->device, net); |
| 1325 |
|
| 1326 |
dev->device.lmp_connection_request = l2cap_lmp_connection_request; |
| 1327 |
dev->device.lmp_connection_complete = l2cap_lmp_connection_complete; |
| 1328 |
dev->device.lmp_disconnect_master = l2cap_lmp_disconnect_host; |
| 1329 |
dev->device.lmp_disconnect_slave = l2cap_lmp_disconnect_slave; |
| 1330 |
dev->device.lmp_acl_data = l2cap_lmp_acl_data_slave; |
| 1331 |
dev->device.lmp_acl_resp = l2cap_lmp_acl_data_host; |
| 1332 |
|
| 1333 |
dev->device.handle_destroy = l2cap_dummy_destroy; |
| 1334 |
} |
| 1335 |
|
| 1336 |
void bt_l2cap_device_done(struct bt_l2cap_device_s *dev) |
| 1337 |
{
|
| 1338 |
bt_device_done(&dev->device); |
| 1339 |
|
| 1340 |
/* Should keep a list of all instances and go through it and
|
| 1341 |
* invoke l2cap_teardown() for each. */
|
| 1342 |
} |
| 1343 |
|
| 1344 |
void bt_l2cap_psm_register(struct bt_l2cap_device_s *dev, int psm, int min_mtu, |
| 1345 |
int (*new_channel)(struct bt_l2cap_device_s *dev, |
| 1346 |
struct bt_l2cap_conn_params_s *params))
|
| 1347 |
{
|
| 1348 |
struct bt_l2cap_psm_s *new_psm = l2cap_psm(dev, psm);
|
| 1349 |
|
| 1350 |
if (new_psm) {
|
| 1351 |
fprintf(stderr, "%s: PSM %04x already registered for device `%s'.\n",
|
| 1352 |
__FUNCTION__, psm, dev->device.lmp_name); |
| 1353 |
exit(-1);
|
| 1354 |
} |
| 1355 |
|
| 1356 |
new_psm = g_malloc0(sizeof(*new_psm));
|
| 1357 |
new_psm->psm = psm; |
| 1358 |
new_psm->min_mtu = min_mtu; |
| 1359 |
new_psm->new_channel = new_channel; |
| 1360 |
new_psm->next = dev->first_psm; |
| 1361 |
dev->first_psm = new_psm; |
| 1362 |
} |