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freebsd-nq/sys/netgraph/bluetooth/socket/ng_btsocket_rfcomm.c
Robert Watson 2658b3bb8e Integrate accept locking from rwatson_netperf, introducing a new 
global mutex, accept_mtx, which serializes access to the following
fields across all sockets:

          so_qlen          so_incqlen         so_qstate
          so_comp          so_incomp          so_list
          so_head

While providing only coarse granularity, this approach avoids lock
order issues between sockets by avoiding ownership of the fields
by a specific socket and its per-socket mutexes.

While here, rewrite soclose(), sofree(), soaccept(), and
sonewconn() to add assertions, close additional races and  address
lock order concerns.  In particular:

- Reorganize the optimistic concurrency behavior in accept1() to
  always allocate a file descriptor with falloc() so that if we do
  find a socket, we don't have to encounter the "Oh, there wasn't
  a socket" race that can occur if falloc() sleeps in the current
  code, which broke inbound accept() ordering, not to mention
  requiring backing out socket state changes in a way that raced
  with the protocol level.  We may want to add a lockless read of
  the queue state if polling of empty queues proves to be important
  to optimize.

- In accept1(), soref() the socket while holding the accept lock
  so that the socket cannot be free'd in a race with the protocol
  layer.  Likewise in netgraph equivilents of the accept1() code.

- In sonewconn(), loop waiting for the queue to be small enough to
  insert our new socket once we've committed to inserting it, or
  races can occur that cause the incomplete socket queue to
  overfill.  In the previously implementation, it was sufficient
  to simply tested once since calling soabort() didn't release
  synchronization permitting another thread to insert a socket as
  we discard a previous one.

- In soclose()/sofree()/et al, it is the responsibility of the
  caller to remove a socket from the incomplete connection queue
  before calling soabort(), which prevents soabort() from having
  to walk into the accept socket to release the socket from its
  queue, and avoids races when releasing the accept mutex to enter
  soabort(), permitting soabort() to avoid lock ordering issues
  with the caller.

- Generally cluster accept queue related operations together
  throughout these functions in order to facilitate locking.

Annotate new locking in socketvar.h.
2004-06-02 04:15:39 +00:00

3584 lines
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/*
* ng_btsocket_rfcomm.c
*
* Copyright (c) 2001-2003 Maksim Yevmenkin <m_evmenkin@yahoo.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: ng_btsocket_rfcomm.c,v 1.28 2003/09/14 23:29:06 max Exp $
* $FreeBSD$
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bitstring.h>
#include <sys/domain.h>
#include <sys/endian.h>
#include <sys/errno.h>
#include <sys/filedesc.h>
#include <sys/ioccom.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/protosw.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sysctl.h>
#include <sys/taskqueue.h>
#include <sys/uio.h>
#include <netgraph/ng_message.h>
#include <netgraph/netgraph.h>
#include <netgraph/bluetooth/include/ng_bluetooth.h>
#include <netgraph/bluetooth/include/ng_hci.h>
#include <netgraph/bluetooth/include/ng_l2cap.h>
#include <netgraph/bluetooth/include/ng_btsocket.h>
#include <netgraph/bluetooth/include/ng_btsocket_l2cap.h>
#include <netgraph/bluetooth/include/ng_btsocket_rfcomm.h>
/* MALLOC define */
#ifdef NG_SEPARATE_MALLOC
MALLOC_DEFINE(M_NETGRAPH_BTSOCKET_RFCOMM, "netgraph_btsocks_rfcomm",
"Netgraph Bluetooth RFCOMM sockets");
#else
#define M_NETGRAPH_BTSOCKET_RFCOMM M_NETGRAPH
#endif /* NG_SEPARATE_MALLOC */
/* Debug */
#define NG_BTSOCKET_RFCOMM_INFO \
if (ng_btsocket_rfcomm_debug_level >= NG_BTSOCKET_INFO_LEVEL) \
printf
#define NG_BTSOCKET_RFCOMM_WARN \
if (ng_btsocket_rfcomm_debug_level >= NG_BTSOCKET_WARN_LEVEL) \
printf
#define NG_BTSOCKET_RFCOMM_ERR \
if (ng_btsocket_rfcomm_debug_level >= NG_BTSOCKET_ERR_LEVEL) \
printf
#define NG_BTSOCKET_RFCOMM_ALERT \
if (ng_btsocket_rfcomm_debug_level >= NG_BTSOCKET_ALERT_LEVEL) \
printf
#define ALOT 0x7fff
/* Local prototypes */
static void ng_btsocket_rfcomm_upcall
(struct socket *so, void *arg, int waitflag);
static void ng_btsocket_rfcomm_sessions_task
(void *ctx, int pending);
static void ng_btsocket_rfcomm_session_task
(ng_btsocket_rfcomm_session_p s);
#define ng_btsocket_rfcomm_task_wakeup() \
taskqueue_enqueue(taskqueue_swi_giant, &ng_btsocket_rfcomm_task)
static ng_btsocket_rfcomm_pcb_p ng_btsocket_rfcomm_connect_ind
(ng_btsocket_rfcomm_session_p s, int channel);
static void ng_btsocket_rfcomm_connect_cfm
(ng_btsocket_rfcomm_session_p s);
static int ng_btsocket_rfcomm_session_create
(ng_btsocket_rfcomm_session_p *sp, struct socket *l2so,
bdaddr_p src, bdaddr_p dst, struct thread *td);
static int ng_btsocket_rfcomm_session_accept
(ng_btsocket_rfcomm_session_p s0);
static int ng_btsocket_rfcomm_session_connect
(ng_btsocket_rfcomm_session_p s);
static int ng_btsocket_rfcomm_session_receive
(ng_btsocket_rfcomm_session_p s);
static int ng_btsocket_rfcomm_session_send
(ng_btsocket_rfcomm_session_p s);
static void ng_btsocket_rfcomm_session_clean
(ng_btsocket_rfcomm_session_p s);
static void ng_btsocket_rfcomm_session_process_pcb
(ng_btsocket_rfcomm_session_p s);
static ng_btsocket_rfcomm_session_p ng_btsocket_rfcomm_session_by_addr
(bdaddr_p src, bdaddr_p dst);
static int ng_btsocket_rfcomm_receive_frame
(ng_btsocket_rfcomm_session_p s, struct mbuf *m0);
static int ng_btsocket_rfcomm_receive_sabm
(ng_btsocket_rfcomm_session_p s, int dlci);
static int ng_btsocket_rfcomm_receive_disc
(ng_btsocket_rfcomm_session_p s, int dlci);
static int ng_btsocket_rfcomm_receive_ua
(ng_btsocket_rfcomm_session_p s, int dlci);
static int ng_btsocket_rfcomm_receive_dm
(ng_btsocket_rfcomm_session_p s, int dlci);
static int ng_btsocket_rfcomm_receive_uih
(ng_btsocket_rfcomm_session_p s, int dlci, int pf, struct mbuf *m0);
static int ng_btsocket_rfcomm_receive_mcc
(ng_btsocket_rfcomm_session_p s, struct mbuf *m0);
static int ng_btsocket_rfcomm_receive_test
(ng_btsocket_rfcomm_session_p s, struct mbuf *m0);
static int ng_btsocket_rfcomm_receive_fc
(ng_btsocket_rfcomm_session_p s, struct mbuf *m0);
static int ng_btsocket_rfcomm_receive_msc
(ng_btsocket_rfcomm_session_p s, struct mbuf *m0);
static int ng_btsocket_rfcomm_receive_rpn
(ng_btsocket_rfcomm_session_p s, struct mbuf *m0);
static int ng_btsocket_rfcomm_receive_rls
(ng_btsocket_rfcomm_session_p s, struct mbuf *m0);
static int ng_btsocket_rfcomm_receive_pn
(ng_btsocket_rfcomm_session_p s, struct mbuf *m0);
static void ng_btsocket_rfcomm_set_pn
(ng_btsocket_rfcomm_pcb_p pcb, u_int8_t cr, u_int8_t flow_control,
u_int8_t credits, u_int16_t mtu);
static int ng_btsocket_rfcomm_send_command
(ng_btsocket_rfcomm_session_p s, u_int8_t type, u_int8_t dlci);
static int ng_btsocket_rfcomm_send_uih
(ng_btsocket_rfcomm_session_p s, u_int8_t address, u_int8_t pf,
u_int8_t credits, struct mbuf *data);
static int ng_btsocket_rfcomm_send_msc
(ng_btsocket_rfcomm_pcb_p pcb);
static int ng_btsocket_rfcomm_send_pn
(ng_btsocket_rfcomm_pcb_p pcb);
static int ng_btsocket_rfcomm_send_credits
(ng_btsocket_rfcomm_pcb_p pcb);
static int ng_btsocket_rfcomm_pcb_send
(ng_btsocket_rfcomm_pcb_p pcb, int limit);
static int ng_btsocket_rfcomm_pcb_kill
(ng_btsocket_rfcomm_pcb_p pcb, int error);
static ng_btsocket_rfcomm_pcb_p ng_btsocket_rfcomm_pcb_by_channel
(bdaddr_p src, int channel);
static ng_btsocket_rfcomm_pcb_p ng_btsocket_rfcomm_pcb_by_dlci
(ng_btsocket_rfcomm_session_p s, int dlci);
static ng_btsocket_rfcomm_pcb_p ng_btsocket_rfcomm_pcb_listener
(bdaddr_p src, int channel);
static void ng_btsocket_rfcomm_timeout
(ng_btsocket_rfcomm_pcb_p pcb);
static void ng_btsocket_rfcomm_untimeout
(ng_btsocket_rfcomm_pcb_p pcb);
static void ng_btsocket_rfcomm_process_timeout
(void *xpcb);
static struct mbuf * ng_btsocket_rfcomm_prepare_packet
(struct sockbuf *sb, int length);
/* Globals */
extern int ifqmaxlen;
static u_int32_t ng_btsocket_rfcomm_debug_level;
static u_int32_t ng_btsocket_rfcomm_timo;
struct task ng_btsocket_rfcomm_task;
static LIST_HEAD(, ng_btsocket_rfcomm_session) ng_btsocket_rfcomm_sessions;
static struct mtx ng_btsocket_rfcomm_sessions_mtx;
static LIST_HEAD(, ng_btsocket_rfcomm_pcb) ng_btsocket_rfcomm_sockets;
static struct mtx ng_btsocket_rfcomm_sockets_mtx;
/* Sysctl tree */
SYSCTL_DECL(_net_bluetooth_rfcomm_sockets);
SYSCTL_NODE(_net_bluetooth_rfcomm_sockets, OID_AUTO, stream, CTLFLAG_RW,
0, "Bluetooth STREAM RFCOMM sockets family");
SYSCTL_INT(_net_bluetooth_rfcomm_sockets_stream, OID_AUTO, debug_level,
CTLFLAG_RW,
&ng_btsocket_rfcomm_debug_level, NG_BTSOCKET_INFO_LEVEL,
"Bluetooth STREAM RFCOMM sockets debug level");
SYSCTL_INT(_net_bluetooth_rfcomm_sockets_stream, OID_AUTO, timeout,
CTLFLAG_RW,
&ng_btsocket_rfcomm_timo, 60,
"Bluetooth STREAM RFCOMM sockets timeout");
/*****************************************************************************
*****************************************************************************
** RFCOMM CRC
*****************************************************************************
*****************************************************************************/
static u_int8_t ng_btsocket_rfcomm_crc_table[256] = {
0x00, 0x91, 0xe3, 0x72, 0x07, 0x96, 0xe4, 0x75,
0x0e, 0x9f, 0xed, 0x7c, 0x09, 0x98, 0xea, 0x7b,
0x1c, 0x8d, 0xff, 0x6e, 0x1b, 0x8a, 0xf8, 0x69,
0x12, 0x83, 0xf1, 0x60, 0x15, 0x84, 0xf6, 0x67,
0x38, 0xa9, 0xdb, 0x4a, 0x3f, 0xae, 0xdc, 0x4d,
0x36, 0xa7, 0xd5, 0x44, 0x31, 0xa0, 0xd2, 0x43,
0x24, 0xb5, 0xc7, 0x56, 0x23, 0xb2, 0xc0, 0x51,
0x2a, 0xbb, 0xc9, 0x58, 0x2d, 0xbc, 0xce, 0x5f,
0x70, 0xe1, 0x93, 0x02, 0x77, 0xe6, 0x94, 0x05,
0x7e, 0xef, 0x9d, 0x0c, 0x79, 0xe8, 0x9a, 0x0b,
0x6c, 0xfd, 0x8f, 0x1e, 0x6b, 0xfa, 0x88, 0x19,
0x62, 0xf3, 0x81, 0x10, 0x65, 0xf4, 0x86, 0x17,
0x48, 0xd9, 0xab, 0x3a, 0x4f, 0xde, 0xac, 0x3d,
0x46, 0xd7, 0xa5, 0x34, 0x41, 0xd0, 0xa2, 0x33,
0x54, 0xc5, 0xb7, 0x26, 0x53, 0xc2, 0xb0, 0x21,
0x5a, 0xcb, 0xb9, 0x28, 0x5d, 0xcc, 0xbe, 0x2f,
0xe0, 0x71, 0x03, 0x92, 0xe7, 0x76, 0x04, 0x95,
0xee, 0x7f, 0x0d, 0x9c, 0xe9, 0x78, 0x0a, 0x9b,
0xfc, 0x6d, 0x1f, 0x8e, 0xfb, 0x6a, 0x18, 0x89,
0xf2, 0x63, 0x11, 0x80, 0xf5, 0x64, 0x16, 0x87,
0xd8, 0x49, 0x3b, 0xaa, 0xdf, 0x4e, 0x3c, 0xad,
0xd6, 0x47, 0x35, 0xa4, 0xd1, 0x40, 0x32, 0xa3,
0xc4, 0x55, 0x27, 0xb6, 0xc3, 0x52, 0x20, 0xb1,
0xca, 0x5b, 0x29, 0xb8, 0xcd, 0x5c, 0x2e, 0xbf,
0x90, 0x01, 0x73, 0xe2, 0x97, 0x06, 0x74, 0xe5,
0x9e, 0x0f, 0x7d, 0xec, 0x99, 0x08, 0x7a, 0xeb,
0x8c, 0x1d, 0x6f, 0xfe, 0x8b, 0x1a, 0x68, 0xf9,
0x82, 0x13, 0x61, 0xf0, 0x85, 0x14, 0x66, 0xf7,
0xa8, 0x39, 0x4b, 0xda, 0xaf, 0x3e, 0x4c, 0xdd,
0xa6, 0x37, 0x45, 0xd4, 0xa1, 0x30, 0x42, 0xd3,
0xb4, 0x25, 0x57, 0xc6, 0xb3, 0x22, 0x50, 0xc1,
0xba, 0x2b, 0x59, 0xc8, 0xbd, 0x2c, 0x5e, 0xcf
};
/* CRC */
static u_int8_t
ng_btsocket_rfcomm_crc(u_int8_t *data, int length)
{
u_int8_t crc = 0xff;
while (length --)
crc = ng_btsocket_rfcomm_crc_table[crc ^ *data++];
return (crc);
} /* ng_btsocket_rfcomm_crc */
/* FCS on 2 bytes */
static u_int8_t
ng_btsocket_rfcomm_fcs2(u_int8_t *data)
{
return (0xff - ng_btsocket_rfcomm_crc(data, 2));
} /* ng_btsocket_rfcomm_fcs2 */
/* FCS on 3 bytes */
static u_int8_t
ng_btsocket_rfcomm_fcs3(u_int8_t *data)
{
return (0xff - ng_btsocket_rfcomm_crc(data, 3));
} /* ng_btsocket_rfcomm_fcs3 */
/*
* Check FCS
*
* From Bluetooth spec
*
* "... In 07.10, the frame check sequence (FCS) is calculated on different
* sets of fields for different frame types. These are the fields that the
* FCS are calculated on:
*
* For SABM, DISC, UA, DM frames: on Address, Control and length field.
* For UIH frames: on Address and Control field.
*
* (This is stated here for clarification, and to set the standard for RFCOMM;
* the fields included in FCS calculation have actually changed in version
* 7.0.0 of TS 07.10, but RFCOMM will not change the FCS calculation scheme
* from the one above.) ..."
*/
static int
ng_btsocket_rfcomm_check_fcs(u_int8_t *data, int type, u_int8_t fcs)
{
if (type != RFCOMM_FRAME_UIH)
return (ng_btsocket_rfcomm_fcs3(data) != fcs);
return (ng_btsocket_rfcomm_fcs2(data) != fcs);
} /* ng_btsocket_rfcomm_check_fcs */
/*****************************************************************************
*****************************************************************************
** Socket interface
*****************************************************************************
*****************************************************************************/
/*
* Initialize everything
*/
void
ng_btsocket_rfcomm_init(void)
{
ng_btsocket_rfcomm_debug_level = NG_BTSOCKET_WARN_LEVEL;
ng_btsocket_rfcomm_timo = 60;
/* RFCOMM task */
TASK_INIT(&ng_btsocket_rfcomm_task, 0,
ng_btsocket_rfcomm_sessions_task, NULL);
/* RFCOMM sessions list */
LIST_INIT(&ng_btsocket_rfcomm_sessions);
mtx_init(&ng_btsocket_rfcomm_sessions_mtx,
"btsocks_rfcomm_sessions_mtx", NULL, MTX_DEF);
/* RFCOMM sockets list */
LIST_INIT(&ng_btsocket_rfcomm_sockets);
mtx_init(&ng_btsocket_rfcomm_sockets_mtx,
"btsocks_rfcomm_sockets_mtx", NULL, MTX_DEF);
} /* ng_btsocket_rfcomm_init */
/*
* Abort connection on socket
*/
int
ng_btsocket_rfcomm_abort(struct socket *so)
{
so->so_error = ECONNABORTED;
return (ng_btsocket_rfcomm_detach(so));
} /* ng_btsocket_rfcomm_abort */
/*
* Accept connection on socket. Nothing to do here, socket must be connected
* and ready, so just return peer address and be done with it.
*/
int
ng_btsocket_rfcomm_accept(struct socket *so, struct sockaddr **nam)
{
return (ng_btsocket_rfcomm_peeraddr(so, nam));
} /* ng_btsocket_rfcomm_accept */
/*
* Create and attach new socket
*/
int
ng_btsocket_rfcomm_attach(struct socket *so, int proto, struct thread *td)
{
ng_btsocket_rfcomm_pcb_p pcb = so2rfcomm_pcb(so);
int error;
/* Check socket and protocol */
if (so->so_type != SOCK_STREAM)
return (ESOCKTNOSUPPORT);
#if 0 /* XXX sonewconn() calls "pru_attach" with proto == 0 */
if (proto != 0)
if (proto != BLUETOOTH_PROTO_RFCOMM)
return (EPROTONOSUPPORT);
#endif /* XXX */
if (pcb != NULL)
return (EISCONN);
/* Reserve send and receive space if it is not reserved yet */
if ((so->so_snd.sb_hiwat == 0) || (so->so_rcv.sb_hiwat == 0)) {
error = soreserve(so, NG_BTSOCKET_RFCOMM_SENDSPACE,
NG_BTSOCKET_RFCOMM_RECVSPACE);
if (error != 0)
return (error);
}
/* Allocate the PCB */
MALLOC(pcb, ng_btsocket_rfcomm_pcb_p, sizeof(*pcb),
M_NETGRAPH_BTSOCKET_RFCOMM, M_NOWAIT | M_ZERO);
if (pcb == NULL)
return (ENOMEM);
/* Link the PCB and the socket */
so->so_pcb = (caddr_t) pcb;
pcb->so = so;
/* Initialize PCB */
pcb->state = NG_BTSOCKET_RFCOMM_DLC_CLOSED;
pcb->flags = NG_BTSOCKET_RFCOMM_DLC_CFC;
pcb->lmodem =
pcb->rmodem = (RFCOMM_MODEM_RTC | RFCOMM_MODEM_RTR | RFCOMM_MODEM_DV);
pcb->mtu = RFCOMM_DEFAULT_MTU;
pcb->tx_cred = 0;
pcb->rx_cred = RFCOMM_DEFAULT_CREDITS;
mtx_init(&pcb->pcb_mtx, "btsocks_rfcomm_pcb_mtx", NULL, MTX_DEF);
callout_handle_init(&pcb->timo);
/* Add the PCB to the list */
mtx_lock(&ng_btsocket_rfcomm_sockets_mtx);
LIST_INSERT_HEAD(&ng_btsocket_rfcomm_sockets, pcb, next);
mtx_unlock(&ng_btsocket_rfcomm_sockets_mtx);
return (0);
} /* ng_btsocket_rfcomm_attach */
/*
* Bind socket
*/
int
ng_btsocket_rfcomm_bind(struct socket *so, struct sockaddr *nam,
struct thread *td)
{
ng_btsocket_rfcomm_pcb_t *pcb = so2rfcomm_pcb(so);
struct sockaddr_rfcomm *sa = (struct sockaddr_rfcomm *) nam;
if (pcb == NULL)
return (EINVAL);
/* Verify address */
if (sa == NULL)
return (EINVAL);
if (sa->rfcomm_family != AF_BLUETOOTH)
return (EAFNOSUPPORT);
if (sa->rfcomm_len != sizeof(*sa))
return (EINVAL);
if (sa->rfcomm_channel > 30)
return (EINVAL);
if (sa->rfcomm_channel != 0 &&
ng_btsocket_rfcomm_pcb_by_channel(&sa->rfcomm_bdaddr, sa->rfcomm_channel) != NULL)
return (EADDRINUSE);
bcopy(&sa->rfcomm_bdaddr, &pcb->src, sizeof(pcb->src));
pcb->channel = sa->rfcomm_channel;
return (0);
} /* ng_btsocket_rfcomm_bind */
/*
* Connect socket
*/
int
ng_btsocket_rfcomm_connect(struct socket *so, struct sockaddr *nam,
struct thread *td)
{
ng_btsocket_rfcomm_pcb_t *pcb = so2rfcomm_pcb(so);
struct sockaddr_rfcomm *sa = (struct sockaddr_rfcomm *) nam;
ng_btsocket_rfcomm_session_t *s = NULL;
struct socket *l2so = NULL;
int dlci, error = 0;
if (pcb == NULL)
return (EINVAL);
/* Verify address */
if (sa == NULL)
return (EINVAL);
if (sa->rfcomm_family != AF_BLUETOOTH)
return (EAFNOSUPPORT);
if (sa->rfcomm_len != sizeof(*sa))
return (EINVAL);
if (sa->rfcomm_channel > 30)
return (EINVAL);
if (sa->rfcomm_channel == 0 ||
bcmp(&sa->rfcomm_bdaddr, NG_HCI_BDADDR_ANY, sizeof(bdaddr_t)) == 0)
return (EDESTADDRREQ);
/*
* XXX FIXME - This is FUBAR. socreate() will call soalloc(1), i.e.
* soalloc() is allowed to sleep in MALLOC. This creates "could sleep"
* WITNESS warnings. To work around this problem we will create L2CAP
* socket first and then check if we actually need it. Note that we
* will not check for errors in socreate() because if we failed to
* create L2CAP socket at this point we still might have already open
* session.
*/
error = socreate(PF_BLUETOOTH, &l2so, SOCK_SEQPACKET,
BLUETOOTH_PROTO_L2CAP, td->td_ucred, td);
/*
* Look for session between "pcb->src" and "sa->rfcomm_bdaddr" (dst)
*/
mtx_lock(&ng_btsocket_rfcomm_sessions_mtx);
s = ng_btsocket_rfcomm_session_by_addr(&pcb->src, &sa->rfcomm_bdaddr);
if (s == NULL) {
/*
* We need to create new RFCOMM session. Check if we have L2CAP
* socket. If l2so == NULL then error has the error code from
* socreate()
*/
if (l2so == NULL) {
mtx_unlock(&ng_btsocket_rfcomm_sessions_mtx);
return (error);
}
error = ng_btsocket_rfcomm_session_create(&s, l2so,
&pcb->src, &sa->rfcomm_bdaddr, td);
if (error != 0) {
mtx_unlock(&ng_btsocket_rfcomm_sessions_mtx);
soclose(l2so);
return (error);
}
} else if (l2so != NULL)
soclose(l2so); /* we don't need new L2CAP socket */
/*
* Check if we already have the same DLCI the the same session
*/
mtx_lock(&s->session_mtx);
mtx_lock(&pcb->pcb_mtx);
dlci = RFCOMM_MKDLCI(!INITIATOR(s), sa->rfcomm_channel);
if (ng_btsocket_rfcomm_pcb_by_dlci(s, dlci) != NULL) {
mtx_unlock(&pcb->pcb_mtx);
mtx_unlock(&s->session_mtx);
mtx_unlock(&ng_btsocket_rfcomm_sessions_mtx);
return (EBUSY);
}
/*
* Check session state and if its not acceptable then refuse connection
*/
switch (s->state) {
case NG_BTSOCKET_RFCOMM_SESSION_CONNECTING:
case NG_BTSOCKET_RFCOMM_SESSION_CONNECTED:
case NG_BTSOCKET_RFCOMM_SESSION_OPEN:
/*
* Update destination address and channel and attach
* DLC to the session
*/
bcopy(&sa->rfcomm_bdaddr, &pcb->dst, sizeof(pcb->dst));
pcb->channel = sa->rfcomm_channel;
pcb->dlci = dlci;
LIST_INSERT_HEAD(&s->dlcs, pcb, session_next);
pcb->session = s;
ng_btsocket_rfcomm_timeout(pcb);
soisconnecting(pcb->so);
if (s->state == NG_BTSOCKET_RFCOMM_SESSION_OPEN) {
pcb->mtu = s->mtu;
bcopy(&so2l2cap_pcb(s->l2so)->src, &pcb->src,
sizeof(pcb->src));
pcb->state = NG_BTSOCKET_RFCOMM_DLC_CONFIGURING;
error = ng_btsocket_rfcomm_send_pn(pcb);
if (error == 0)
error = ng_btsocket_rfcomm_task_wakeup();
} else
pcb->state = NG_BTSOCKET_RFCOMM_DLC_W4_CONNECT;
break;
default:
error = ECONNRESET;
break;
}
mtx_unlock(&pcb->pcb_mtx);
mtx_unlock(&s->session_mtx);
mtx_unlock(&ng_btsocket_rfcomm_sessions_mtx);
return (error);
} /* ng_btsocket_rfcomm_connect */
/*
* Process ioctl's calls on socket.
* XXX FIXME this should provide interface to the RFCOMM multiplexor channel
*/
int
ng_btsocket_rfcomm_control(struct socket *so, u_long cmd, caddr_t data,
struct ifnet *ifp, struct thread *td)
{
return (EINVAL);
} /* ng_btsocket_rfcomm_control */
/*
* Process getsockopt/setsockopt system calls
*/
int
ng_btsocket_rfcomm_ctloutput(struct socket *so, struct sockopt *sopt)
{
ng_btsocket_rfcomm_pcb_p pcb = so2rfcomm_pcb(so);
struct ng_btsocket_rfcomm_fc_info fcinfo;
int error = 0;
if (pcb == NULL)
return (EINVAL);
if (sopt->sopt_level != SOL_RFCOMM)
return (0);
mtx_lock(&pcb->pcb_mtx);
switch (sopt->sopt_dir) {
case SOPT_GET:
switch (sopt->sopt_name) {
case SO_RFCOMM_MTU:
error = sooptcopyout(sopt, &pcb->mtu, sizeof(pcb->mtu));
break;
case SO_RFCOMM_FC_INFO:
fcinfo.lmodem = pcb->lmodem;
fcinfo.rmodem = pcb->rmodem;
fcinfo.tx_cred = pcb->tx_cred;
fcinfo.rx_cred = pcb->rx_cred;
fcinfo.cfc = (pcb->flags & NG_BTSOCKET_RFCOMM_DLC_CFC)?
1 : 0;
fcinfo.reserved = 0;
error = sooptcopyout(sopt, &fcinfo, sizeof(fcinfo));
break;
default:
error = ENOPROTOOPT;
break;
}
break;
case SOPT_SET:
switch (sopt->sopt_name) {
default:
error = ENOPROTOOPT;
break;
}
break;
default:
error = EINVAL;
break;
}
mtx_unlock(&pcb->pcb_mtx);
return (error);
} /* ng_btsocket_rfcomm_ctloutput */
/*
* Detach and destroy socket
*/
int
ng_btsocket_rfcomm_detach(struct socket *so)
{
ng_btsocket_rfcomm_pcb_p pcb = so2rfcomm_pcb(so);
if (pcb == NULL)
return (EINVAL);
mtx_lock(&pcb->pcb_mtx);
switch (pcb->state) {
case NG_BTSOCKET_RFCOMM_DLC_W4_CONNECT:
case NG_BTSOCKET_RFCOMM_DLC_CONFIGURING:
case NG_BTSOCKET_RFCOMM_DLC_CONNECTING:
case NG_BTSOCKET_RFCOMM_DLC_CONNECTED:
/* XXX What to do with pending request? */
if (pcb->flags & NG_BTSOCKET_RFCOMM_DLC_TIMO)
ng_btsocket_rfcomm_untimeout(pcb);
if (pcb->state == NG_BTSOCKET_RFCOMM_DLC_W4_CONNECT)
pcb->flags |= NG_BTSOCKET_RFCOMM_DLC_DETACHED;
else
pcb->state = NG_BTSOCKET_RFCOMM_DLC_DISCONNECTING;
ng_btsocket_rfcomm_task_wakeup();
break;
case NG_BTSOCKET_RFCOMM_DLC_DISCONNECTING:
ng_btsocket_rfcomm_task_wakeup();
break;
}
while (pcb->state != NG_BTSOCKET_RFCOMM_DLC_CLOSED)
msleep(&pcb->state, &pcb->pcb_mtx, PZERO, "rf_det", 0);
if (pcb->session != NULL)
panic("%s: pcb->session != NULL\n", __func__);
if (pcb->flags & NG_BTSOCKET_RFCOMM_DLC_TIMO)
panic("%s: timeout on closed DLC, flags=%#x\n",
__func__, pcb->flags);
mtx_lock(&ng_btsocket_rfcomm_sockets_mtx);
LIST_REMOVE(pcb, next);
mtx_unlock(&ng_btsocket_rfcomm_sockets_mtx);
mtx_unlock(&pcb->pcb_mtx);
mtx_destroy(&pcb->pcb_mtx);
bzero(pcb, sizeof(*pcb));
FREE(pcb, M_NETGRAPH_BTSOCKET_RFCOMM);
soisdisconnected(so);
so->so_pcb = NULL;
sotryfree(so);
return (0);
} /* ng_btsocket_rfcomm_detach */
/*
* Disconnect socket
*/
int
ng_btsocket_rfcomm_disconnect(struct socket *so)
{
ng_btsocket_rfcomm_pcb_p pcb = so2rfcomm_pcb(so);
if (pcb == NULL)
return (EINVAL);
mtx_lock(&pcb->pcb_mtx);
if (pcb->state == NG_BTSOCKET_RFCOMM_DLC_DISCONNECTING) {
mtx_unlock(&pcb->pcb_mtx);
return (EINPROGRESS);
}
/* XXX What to do with pending request? */
if (pcb->flags & NG_BTSOCKET_RFCOMM_DLC_TIMO)
ng_btsocket_rfcomm_untimeout(pcb);
switch (pcb->state) {
case NG_BTSOCKET_RFCOMM_DLC_CONFIGURING: /* XXX can we get here? */
case NG_BTSOCKET_RFCOMM_DLC_CONNECTING: /* XXX can we get here? */
case NG_BTSOCKET_RFCOMM_DLC_CONNECTED:
/*
* Just change DLC state and enqueue RFCOMM task. It will
* queue and send DISC on the DLC.
*/
pcb->state = NG_BTSOCKET_RFCOMM_DLC_DISCONNECTING;
soisdisconnecting(so);
ng_btsocket_rfcomm_task_wakeup();
break;
/*
* case NG_BTSOCKET_RFCOMM_DLC_CLOSED:
* case NG_BTSOCKET_RFCOMM_DLC_W4_CONNECT:
* case NG_BTSOCKET_RFCOMM_DLC_DISCONNECTING:
*/
default:
panic("%s: Invalid DLC state=%d, flags=%#x\n",
__func__, pcb->state, pcb->flags);
break;
}
mtx_unlock(&pcb->pcb_mtx);
return (0);
} /* ng_btsocket_rfcomm_disconnect */
/*
* Listen on socket. First call to listen() will create listening RFCOMM session
*/
int
ng_btsocket_rfcomm_listen(struct socket *so, struct thread *td)
{
ng_btsocket_rfcomm_pcb_p pcb = so2rfcomm_pcb(so);
ng_btsocket_rfcomm_session_p s = NULL;
struct socket *l2so = NULL;
int error;
if (pcb == NULL)
return (EINVAL);
if (pcb->channel < 1 || pcb->channel > 30)
return (EDESTADDRREQ);
/*
* XXX FIXME - This is FUBAR. socreate() will call soalloc(1), i.e.
* soalloc() is allowed to sleep in MALLOC. This creates "could sleep"
* WITNESS warnings. To work around this problem we will create L2CAP
* socket first and then check if we actually need it. Note that we
* will not check for errors in socreate() because if we failed to
* create L2CAP socket at this point we still might have already open
* session.
*/
error = socreate(PF_BLUETOOTH, &l2so, SOCK_SEQPACKET,
BLUETOOTH_PROTO_L2CAP, td->td_ucred, td);
/*
* Look for the session in LISTENING state. There can only be one.
*/
mtx_lock(&ng_btsocket_rfcomm_sessions_mtx);
LIST_FOREACH(s, &ng_btsocket_rfcomm_sessions, next)
if (s->state == NG_BTSOCKET_RFCOMM_SESSION_LISTENING)
break;
if (s == NULL) {
/*
* We need to create default RFCOMM session. Check if we have
* L2CAP socket. If l2so == NULL then error has the error code
* from socreate()
*/
if (l2so == NULL) {
mtx_unlock(&ng_btsocket_rfcomm_sessions_mtx);
return (error);
}
/*
* Create default listen RFCOMM session. The default RFCOMM
* session will listen on ANY address.
*
* XXX FIXME Note that currently there is no way to adjust MTU
* for the default session.
*/
error = ng_btsocket_rfcomm_session_create(&s, l2so,
NG_HCI_BDADDR_ANY, NULL, td);
if (error != 0) {
mtx_unlock(&ng_btsocket_rfcomm_sessions_mtx);
soclose(l2so);
return (error);
}
} else if (l2so != NULL)
soclose(l2so); /* we don't need new L2CAP socket */
mtx_unlock(&ng_btsocket_rfcomm_sessions_mtx);
return (0);
} /* ng_btsocket_listen */
/*
* Get peer address
*/
int
ng_btsocket_rfcomm_peeraddr(struct socket *so, struct sockaddr **nam)
{
ng_btsocket_rfcomm_pcb_p pcb = so2rfcomm_pcb(so);
struct sockaddr_rfcomm sa;
if (pcb == NULL)
return (EINVAL);
bcopy(&pcb->dst, &sa.rfcomm_bdaddr, sizeof(sa.rfcomm_bdaddr));
sa.rfcomm_channel = pcb->channel;
sa.rfcomm_len = sizeof(sa);
sa.rfcomm_family = AF_BLUETOOTH;
*nam = sodupsockaddr((struct sockaddr *) &sa, M_NOWAIT);
return ((*nam == NULL)? ENOMEM : 0);
} /* ng_btsocket_rfcomm_peeraddr */
/*
* Send data to socket
*/
int
ng_btsocket_rfcomm_send(struct socket *so, int flags, struct mbuf *m,
struct sockaddr *nam, struct mbuf *control, struct thread *td)
{
ng_btsocket_rfcomm_pcb_t *pcb = so2rfcomm_pcb(so);
int error = 0;
/* Check socket and input */
if (pcb == NULL || m == NULL || control != NULL) {
error = EINVAL;
goto drop;
}
mtx_lock(&pcb->pcb_mtx);
/* Make sure DLC is connected */
if (pcb->state != NG_BTSOCKET_RFCOMM_DLC_CONNECTED) {
mtx_unlock(&pcb->pcb_mtx);
error = ENOTCONN;
goto drop;
}
/* Put the packet on the socket's send queue and wakeup RFCOMM task */
sbappend(&pcb->so->so_snd, m);
m = NULL;
if (!(pcb->flags & NG_BTSOCKET_RFCOMM_DLC_SENDING)) {
pcb->flags |= NG_BTSOCKET_RFCOMM_DLC_SENDING;
error = ng_btsocket_rfcomm_task_wakeup();
}
mtx_unlock(&pcb->pcb_mtx);
drop:
NG_FREE_M(m); /* checks for != NULL */
NG_FREE_M(control);
return (error);
} /* ng_btsocket_rfcomm_send */
/*
* Get socket address
*/
int
ng_btsocket_rfcomm_sockaddr(struct socket *so, struct sockaddr **nam)
{
ng_btsocket_rfcomm_pcb_p pcb = so2rfcomm_pcb(so);
struct sockaddr_rfcomm sa;
if (pcb == NULL)
return (EINVAL);
bcopy(&pcb->src, &sa.rfcomm_bdaddr, sizeof(sa.rfcomm_bdaddr));
sa.rfcomm_channel = pcb->channel;
sa.rfcomm_len = sizeof(sa);
sa.rfcomm_family = AF_BLUETOOTH;
*nam = sodupsockaddr((struct sockaddr *) &sa, M_NOWAIT);
return ((*nam == NULL)? ENOMEM : 0);
} /* ng_btsocket_rfcomm_sockaddr */
/*
* Upcall function for L2CAP sockets. Enqueue RFCOMM task.
*/
static void
ng_btsocket_rfcomm_upcall(struct socket *so, void *arg, int waitflag)
{
int error;
if (so == NULL)
panic("%s: so == NULL\n", __func__);
if ((error = ng_btsocket_rfcomm_task_wakeup()) != 0)
NG_BTSOCKET_RFCOMM_ALERT(
"%s: Could not enqueue RFCOMM task, error=%d\n", __func__, error);
} /* ng_btsocket_rfcomm_upcall */
/*
* RFCOMM task. Will handle all RFCOMM sessions in one pass.
* XXX FIXME does not scale very well
*/
static void
ng_btsocket_rfcomm_sessions_task(void *ctx, int pending)
{
ng_btsocket_rfcomm_session_p s = NULL, s_next = NULL;
mtx_lock(&ng_btsocket_rfcomm_sessions_mtx);
for (s = LIST_FIRST(&ng_btsocket_rfcomm_sessions); s != NULL; ) {
mtx_lock(&s->session_mtx);
s_next = LIST_NEXT(s, next);
ng_btsocket_rfcomm_session_task(s);
if (s->state == NG_BTSOCKET_RFCOMM_SESSION_CLOSED) {
/* Unlink and clean the session */
LIST_REMOVE(s, next);
NG_BT_MBUFQ_DRAIN(&s->outq);
if (!LIST_EMPTY(&s->dlcs))
panic("%s: DLC list is not empty\n", __func__);
/* Close L2CAP socket */
s->l2so->so_upcallarg = NULL;
s->l2so->so_upcall = NULL;
s->l2so->so_rcv.sb_flags &= ~SB_UPCALL;
s->l2so->so_snd.sb_flags &= ~SB_UPCALL;
soclose(s->l2so);
mtx_unlock(&s->session_mtx);
mtx_destroy(&s->session_mtx);
bzero(s, sizeof(*s));
FREE(s, M_NETGRAPH_BTSOCKET_RFCOMM);
} else
mtx_unlock(&s->session_mtx);
s = s_next;
}
mtx_unlock(&ng_btsocket_rfcomm_sessions_mtx);
} /* ng_btsocket_rfcomm_sessions_task */
/*
* Process RFCOMM session. Will handle all RFCOMM sockets in one pass.
*/
static void
ng_btsocket_rfcomm_session_task(ng_btsocket_rfcomm_session_p s)
{
mtx_assert(&s->session_mtx, MA_OWNED);
if (s->l2so->so_state & SS_CANTRCVMORE) {
NG_BTSOCKET_RFCOMM_INFO(
"%s: L2CAP connection has been terminated, so=%p, so_state=%#x, so_count=%d, " \
"state=%d, flags=%#x\n", __func__, s->l2so, s->l2so->so_state,
s->l2so->so_count, s->state, s->flags);
s->state = NG_BTSOCKET_RFCOMM_SESSION_CLOSED;
ng_btsocket_rfcomm_session_clean(s);
}
/* Now process upcall */
switch (s->state) {
/* Try to accept new L2CAP connection(s) */
case NG_BTSOCKET_RFCOMM_SESSION_LISTENING:
while (ng_btsocket_rfcomm_session_accept(s) == 0)
;
break;
/* Process the results of the L2CAP connect */
case NG_BTSOCKET_RFCOMM_SESSION_CONNECTING:
ng_btsocket_rfcomm_session_process_pcb(s);
if (ng_btsocket_rfcomm_session_connect(s) != 0) {
s->state = NG_BTSOCKET_RFCOMM_SESSION_CLOSED;
ng_btsocket_rfcomm_session_clean(s);
}
break;
/* Try to receive/send more data */
case NG_BTSOCKET_RFCOMM_SESSION_CONNECTED:
case NG_BTSOCKET_RFCOMM_SESSION_OPEN:
case NG_BTSOCKET_RFCOMM_SESSION_DISCONNECTING:
ng_btsocket_rfcomm_session_process_pcb(s);
if (ng_btsocket_rfcomm_session_receive(s) != 0) {
s->state = NG_BTSOCKET_RFCOMM_SESSION_CLOSED;
ng_btsocket_rfcomm_session_clean(s);
} else if (ng_btsocket_rfcomm_session_send(s) != 0) {
s->state = NG_BTSOCKET_RFCOMM_SESSION_CLOSED;
ng_btsocket_rfcomm_session_clean(s);
}
break;
case NG_BTSOCKET_RFCOMM_SESSION_CLOSED:
break;
default:
panic("%s: Invalid session state=%d, flags=%#x\n",
__func__, s->state, s->flags);
break;
}
} /* ng_btsocket_rfcomm_session_task */
/*
* Process RFCOMM connection indicator. Caller must hold s->session_mtx
*/
static ng_btsocket_rfcomm_pcb_p
ng_btsocket_rfcomm_connect_ind(ng_btsocket_rfcomm_session_p s, int channel)
{
ng_btsocket_rfcomm_pcb_p pcb = NULL, pcb1 = NULL;
ng_btsocket_l2cap_pcb_p l2pcb = NULL;
struct socket *so1 = NULL;
mtx_assert(&s->session_mtx, MA_OWNED);
/*
* Try to find RFCOMM socket that listens on given source address
* and channel. This will return the best possible match.
*/
l2pcb = so2l2cap_pcb(s->l2so);
pcb = ng_btsocket_rfcomm_pcb_listener(&l2pcb->src, channel);
if (pcb == NULL)
return (NULL);
/*
* Check the pending connections queue and if we have space then
* create new socket and set proper source and destination address,
* and channel.
*/
mtx_lock(&pcb->pcb_mtx);
if (pcb->so->so_qlen <= pcb->so->so_qlimit)
so1 = sonewconn(pcb->so, 0);
mtx_unlock(&pcb->pcb_mtx);
if (so1 == NULL)
return (NULL);
/*
* If we got here than we have created new socket. So complete the
* connection. Set source and destination address from the session.
*/
pcb1 = so2rfcomm_pcb(so1);
if (pcb1 == NULL)
panic("%s: pcb1 == NULL\n", __func__);
mtx_lock(&pcb1->pcb_mtx);
bcopy(&l2pcb->src, &pcb1->src, sizeof(pcb1->src));
bcopy(&l2pcb->dst, &pcb1->dst, sizeof(pcb1->dst));
pcb1->channel = channel;
/* Link new DLC to the session. We already hold s->session_mtx */
LIST_INSERT_HEAD(&s->dlcs, pcb1, session_next);
pcb1->session = s;
mtx_unlock(&pcb1->pcb_mtx);
return (pcb1);
} /* ng_btsocket_rfcomm_connect_ind */
/*
* Process RFCOMM connect confirmation. Caller must hold s->session_mtx.
*/
static void
ng_btsocket_rfcomm_connect_cfm(ng_btsocket_rfcomm_session_p s)
{
ng_btsocket_rfcomm_pcb_p pcb = NULL, pcb_next = NULL;
struct socket *so = NULL;
int error;
mtx_assert(&s->session_mtx, MA_OWNED);
/*
* Wake up all waiting sockets and send PN request for each of them.
* Note that timeout already been set in ng_btsocket_rfcomm_connect()
*
* Note: cannot use LIST_FOREACH because ng_btsocket_rfcomm_pcb_kill
* will unlink DLC from the session
*/
for (pcb = LIST_FIRST(&s->dlcs); pcb != NULL; ) {
mtx_lock(&pcb->pcb_mtx);
pcb_next = LIST_NEXT(pcb, session_next);
if (pcb->state == NG_BTSOCKET_RFCOMM_DLC_W4_CONNECT) {
pcb->mtu = s->mtu;
bcopy(&so2l2cap_pcb(s->l2so)->src, &pcb->src,
sizeof(pcb->src));
error = ng_btsocket_rfcomm_send_pn(pcb);
if (error == 0)
pcb->state = NG_BTSOCKET_RFCOMM_DLC_CONFIGURING;
else if (ng_btsocket_rfcomm_pcb_kill(pcb, error))
so = pcb->so;
else
so = NULL;
}
mtx_unlock(&pcb->pcb_mtx);
pcb = pcb_next;
if (so != NULL)
ng_btsocket_rfcomm_detach(so);
}
} /* ng_btsocket_rfcomm_connect_cfm */
/*****************************************************************************
*****************************************************************************
** RFCOMM sessions
*****************************************************************************
*****************************************************************************/
/*
* Create new RFCOMM session. That function WILL NOT take ownership over l2so.
* Caller MUST free l2so if function failed.
*/
static int
ng_btsocket_rfcomm_session_create(ng_btsocket_rfcomm_session_p *sp,
struct socket *l2so, bdaddr_p src, bdaddr_p dst,
struct thread *td)
{
ng_btsocket_rfcomm_session_p s = NULL;
struct sockaddr_l2cap l2sa;
struct sockopt l2sopt;
int mtu, error;
mtx_assert(&ng_btsocket_rfcomm_sessions_mtx, MA_OWNED);
/* Allocate the RFCOMM session */
MALLOC(s, ng_btsocket_rfcomm_session_p, sizeof(*s),
M_NETGRAPH_BTSOCKET_RFCOMM, M_NOWAIT | M_ZERO);
if (s == NULL)
return (ENOMEM);
/* Set defaults */
s->mtu = RFCOMM_DEFAULT_MTU;
s->flags = 0;
s->state = NG_BTSOCKET_RFCOMM_SESSION_CLOSED;
NG_BT_MBUFQ_INIT(&s->outq, ifqmaxlen);
/*
* XXX Mark session mutex as DUPOK to prevent "duplicated lock of
* the same type" message. When accepting new L2CAP connection
* ng_btsocket_rfcomm_session_accept() holds both session mutexes
* for "old" (accepting) session and "new" (created) session.
*/
mtx_init(&s->session_mtx, "btsocks_rfcomm_session_mtx", NULL,
MTX_DEF|MTX_DUPOK);
LIST_INIT(&s->dlcs);
/* Prepare L2CAP socket */
l2so->so_upcallarg = NULL;
l2so->so_upcall = ng_btsocket_rfcomm_upcall;
l2so->so_rcv.sb_flags |= SB_UPCALL;
l2so->so_snd.sb_flags |= SB_UPCALL;
l2so->so_state |= SS_NBIO;
s->l2so = l2so;
mtx_lock(&s->session_mtx);
/*
* "src" == NULL and "dst" == NULL means just create session.
* caller must do the rest
*/
if (src == NULL && dst == NULL)
goto done;
/*
* Set incoming MTU on L2CAP socket. It is RFCOMM session default MTU
* plus 5 bytes: RFCOMM frame header, one extra byte for length and one
* extra byte for credits.
*/
mtu = s->mtu + sizeof(struct rfcomm_frame_hdr) + 1 + 1;
l2sopt.sopt_dir = SOPT_SET;
l2sopt.sopt_level = SOL_L2CAP;
l2sopt.sopt_name = SO_L2CAP_IMTU;
l2sopt.sopt_val = (void *) &mtu;
l2sopt.sopt_valsize = sizeof(mtu);
l2sopt.sopt_td = NULL;
error = sosetopt(s->l2so, &l2sopt);
if (error != 0)
goto bad;
/* Bind socket to "src" address */
l2sa.l2cap_len = sizeof(l2sa);
l2sa.l2cap_family = AF_BLUETOOTH;
l2sa.l2cap_psm = (dst == NULL)? htole16(NG_L2CAP_PSM_RFCOMM) : 0;
bcopy(src, &l2sa.l2cap_bdaddr, sizeof(l2sa.l2cap_bdaddr));
error = sobind(s->l2so, (struct sockaddr *) &l2sa, td);
if (error != 0)
goto bad;
/* If "dst" is not NULL then initiate connect(), otherwise listen() */
if (dst == NULL) {
s->flags = 0;
s->state = NG_BTSOCKET_RFCOMM_SESSION_LISTENING;
error = solisten(s->l2so, 10, td);
if (error != 0)
goto bad;
} else {
s->flags = NG_BTSOCKET_RFCOMM_SESSION_INITIATOR;
s->state = NG_BTSOCKET_RFCOMM_SESSION_CONNECTING;
l2sa.l2cap_len = sizeof(l2sa);
l2sa.l2cap_family = AF_BLUETOOTH;
l2sa.l2cap_psm = htole16(NG_L2CAP_PSM_RFCOMM);
bcopy(dst, &l2sa.l2cap_bdaddr, sizeof(l2sa.l2cap_bdaddr));
error = soconnect(s->l2so, (struct sockaddr *) &l2sa, td);
if (error != 0)
goto bad;
}
done:
LIST_INSERT_HEAD(&ng_btsocket_rfcomm_sessions, s, next);
*sp = s;
mtx_unlock(&s->session_mtx);
return (0);
bad:
mtx_unlock(&s->session_mtx);
/* Return L2CAP socket back to its original state */
l2so->so_upcallarg = NULL;
l2so->so_upcall = NULL;
l2so->so_rcv.sb_flags &= ~SB_UPCALL;
l2so->so_snd.sb_flags &= ~SB_UPCALL;
l2so->so_state &= ~SS_NBIO;
mtx_destroy(&s->session_mtx);
bzero(s, sizeof(*s));
FREE(s, M_NETGRAPH_BTSOCKET_RFCOMM);
return (error);
} /* ng_btsocket_rfcomm_session_create */
/*
* Process accept() on RFCOMM session
* XXX FIXME locking for "l2so"?
*/
static int
ng_btsocket_rfcomm_session_accept(ng_btsocket_rfcomm_session_p s0)
{
struct socket *l2so = NULL;
struct sockaddr_l2cap *l2sa = NULL;
ng_btsocket_l2cap_pcb_t *l2pcb = NULL;
ng_btsocket_rfcomm_session_p s = NULL;
int error = 0;
mtx_assert(&ng_btsocket_rfcomm_sessions_mtx, MA_OWNED);
mtx_assert(&s0->session_mtx, MA_OWNED);
/* Check if there is a complete L2CAP connection in the queue */
if ((error = s0->l2so->so_error) != 0) {
NG_BTSOCKET_RFCOMM_ERR(
"%s: Could not accept connection on L2CAP socket, error=%d\n", __func__, error);
s0->l2so->so_error = 0;
return (error);
}
ACCEPT_LOCK();
if (TAILQ_EMPTY(&s0->l2so->so_comp)) {
ACCEPT_UNLOCK();
if (s0->l2so->so_state & SS_CANTRCVMORE)
return (ECONNABORTED);
return (EWOULDBLOCK);
}
/* Accept incoming L2CAP connection */
l2so = TAILQ_FIRST(&s0->l2so->so_comp);
if (l2so == NULL)
panic("%s: l2so == NULL\n", __func__);
TAILQ_REMOVE(&s0->l2so->so_comp, l2so, so_list);
s0->l2so->so_qlen --;
l2so->so_qstate &= ~SQ_COMP;
l2so->so_head = NULL;
soref(l2so);
l2so->so_state |= SS_NBIO;
ACCEPT_UNLOCK();
error = soaccept(l2so, (struct sockaddr **) &l2sa);
if (error != 0) {
NG_BTSOCKET_RFCOMM_ERR(
"%s: soaccept() on L2CAP socket failed, error=%d\n", __func__, error);
soclose(l2so);
return (error);
}
/*
* Check if there is already active RFCOMM session between two devices.
* If so then close L2CAP connection. We only support one RFCOMM session
* between each pair of devices. Note that here we assume session in any
* state. The session even could be in the middle of disconnecting.
*/
l2pcb = so2l2cap_pcb(l2so);
s = ng_btsocket_rfcomm_session_by_addr(&l2pcb->src, &l2pcb->dst);
if (s == NULL) {
/* Create a new RFCOMM session */
error = ng_btsocket_rfcomm_session_create(&s, l2so, NULL, NULL,
curthread /* XXX */);
if (error == 0) {
mtx_lock(&s->session_mtx);
s->flags = 0;
s->state = NG_BTSOCKET_RFCOMM_SESSION_CONNECTED;
/*
* Adjust MTU on incomming connection. Reserve 5 bytes:
* RFCOMM frame header, one extra byte for length and
* one extra byte for credits.
*/
s->mtu = min(l2pcb->imtu, l2pcb->omtu) -
sizeof(struct rfcomm_frame_hdr) - 1 - 1;
mtx_unlock(&s->session_mtx);
} else {
NG_BTSOCKET_RFCOMM_ALERT(
"%s: Failed to create new RFCOMM session, error=%d\n", __func__, error);
soclose(l2so);
}
} else {
NG_BTSOCKET_RFCOMM_WARN(
"%s: Rejecting duplicating RFCOMM session between src=%x:%x:%x:%x:%x:%x and " \
"dst=%x:%x:%x:%x:%x:%x, state=%d, flags=%#x\n", __func__,
l2pcb->src.b[5], l2pcb->src.b[4], l2pcb->src.b[3],
l2pcb->src.b[2], l2pcb->src.b[1], l2pcb->src.b[0],
l2pcb->dst.b[5], l2pcb->dst.b[4], l2pcb->dst.b[3],
l2pcb->dst.b[2], l2pcb->dst.b[1], l2pcb->dst.b[0],
s->state, s->flags);
error = EBUSY;
soclose(l2so);
}
return (error);
} /* ng_btsocket_rfcomm_session_accept */
/*
* Process connect() on RFCOMM session
* XXX FIXME locking for "l2so"?
*/
static int
ng_btsocket_rfcomm_session_connect(ng_btsocket_rfcomm_session_p s)
{
ng_btsocket_l2cap_pcb_p l2pcb = so2l2cap_pcb(s->l2so);
int error;
mtx_assert(&s->session_mtx, MA_OWNED);
/* First check if connection has failed */
if ((error = s->l2so->so_error) != 0) {
s->l2so->so_error = 0;
NG_BTSOCKET_RFCOMM_ERR(
"%s: Could not connect RFCOMM session, error=%d, state=%d, flags=%#x\n",
__func__, error, s->state, s->flags);
return (error);
}
/* Is connection still in progress? */
if (s->l2so->so_state & SS_ISCONNECTING)
return (0);
/*
* If we got here then we are connected. Send SABM on DLCI 0 to
* open multiplexor channel.
*/
if (error == 0) {
s->state = NG_BTSOCKET_RFCOMM_SESSION_CONNECTED;
/*
* Adjust MTU on outgoing connection. Reserve 5 bytes: RFCOMM
* frame header, one extra byte for length and one extra byte
* for credits.
*/
s->mtu = min(l2pcb->imtu, l2pcb->omtu) -
sizeof(struct rfcomm_frame_hdr) - 1 - 1;
error = ng_btsocket_rfcomm_send_command(s,RFCOMM_FRAME_SABM,0);
if (error == 0)
error = ng_btsocket_rfcomm_task_wakeup();
}
return (error);
}/* ng_btsocket_rfcomm_session_connect */
/*
* Receive data on RFCOMM session
* XXX FIXME locking for "l2so"?
*/
static int
ng_btsocket_rfcomm_session_receive(ng_btsocket_rfcomm_session_p s)
{
struct mbuf *m = NULL;
struct uio uio;
int more, flags, error;
mtx_assert(&s->session_mtx, MA_OWNED);
/* Can we read from the L2CAP socket? */
if (!soreadable(s->l2so))
return (0);
/* First check for error on L2CAP socket */
if ((error = s->l2so->so_error) != 0) {
s->l2so->so_error = 0;
NG_BTSOCKET_RFCOMM_ERR(
"%s: Could not receive data from L2CAP socket, error=%d, state=%d, flags=%#x\n",
__func__, error, s->state, s->flags);
return (error);
}
/*
* Read all packets from the L2CAP socket.
* XXX FIXME/VERIFY is that correct? For now use m->m_nextpkt as
* indication that there is more packets on the socket's buffer.
* Also what should we use in uio.uio_resid?
* May be s->mtu + sizeof(struct rfcomm_frame_hdr) + 1 + 1?
*/
for (more = 1; more; ) {
/* Try to get next packet from socket */
bzero(&uio, sizeof(uio));
/* uio.uio_td = NULL; */
uio.uio_resid = 1000000000;
flags = MSG_DONTWAIT;
m = NULL;
error = (*s->l2so->so_proto->pr_usrreqs->pru_soreceive)(s->l2so,
NULL, &uio, &m, (struct mbuf **) NULL, &flags);
if (error != 0) {
if (error == EWOULDBLOCK)
return (0); /* XXX can happen? */
NG_BTSOCKET_RFCOMM_ERR(
"%s: Could not receive data from L2CAP socket, error=%d\n", __func__, error);
return (error);
}
more = (m->m_nextpkt != NULL);
m->m_nextpkt = NULL;
ng_btsocket_rfcomm_receive_frame(s, m);
}
return (0);
} /* ng_btsocket_rfcomm_session_receive */
/*
* Send data on RFCOMM session
* XXX FIXME locking for "l2so"?
*/
static int
ng_btsocket_rfcomm_session_send(ng_btsocket_rfcomm_session_p s)
{
struct mbuf *m = NULL;
int error;
mtx_assert(&s->session_mtx, MA_OWNED);
/* Send as much as we can from the session queue */
while (sowriteable(s->l2so)) {
/* Check if socket still OK */
if ((error = s->l2so->so_error) != 0) {
s->l2so->so_error = 0;
NG_BTSOCKET_RFCOMM_ERR(
"%s: Detected error=%d on L2CAP socket, state=%d, flags=%#x\n",
__func__, error, s->state, s->flags);
return (error);
}
NG_BT_MBUFQ_DEQUEUE(&s->outq, m);
if (m == NULL)
return (0); /* we are done */
/* Call send function on the L2CAP socket */
error = (*s->l2so->so_proto->pr_usrreqs->pru_sosend)
(s->l2so, NULL, NULL, m, NULL, 0,
curthread /* XXX */);
if (error != 0) {
NG_BTSOCKET_RFCOMM_ERR(
"%s: Could not send data to L2CAP socket, error=%d\n", __func__, error);
return (error);
}
}
return (0);
} /* ng_btsocket_rfcomm_session_send */
/*
* Close and disconnect all DLCs for the given session. Caller must hold
* s->sesson_mtx. Will wakeup session.
*/
static void
ng_btsocket_rfcomm_session_clean(ng_btsocket_rfcomm_session_p s)
{
ng_btsocket_rfcomm_pcb_p pcb = NULL, pcb_next = NULL;
struct socket *so = NULL;
int error;
mtx_assert(&s->session_mtx, MA_OWNED);
/*
* Note: cannot use LIST_FOREACH because ng_btsocket_rfcomm_pcb_kill
* will unlink DLC from the session
*/
for (pcb = LIST_FIRST(&s->dlcs); pcb != NULL; ) {
mtx_lock(&pcb->pcb_mtx);
pcb_next = LIST_NEXT(pcb, session_next);
NG_BTSOCKET_RFCOMM_INFO(
"%s: Disconnecting dlci=%d, state=%d, flags=%#x\n",
__func__, pcb->dlci, pcb->state, pcb->flags);
if (pcb->state == NG_BTSOCKET_RFCOMM_DLC_CONNECTED)
error = ECONNRESET;
else
error = ECONNREFUSED;
if (ng_btsocket_rfcomm_pcb_kill(pcb, error))
so = pcb->so;
else
so = NULL;
mtx_unlock(&pcb->pcb_mtx);
pcb = pcb_next;
if (so != NULL)
ng_btsocket_rfcomm_detach(so);
}
} /* ng_btsocket_rfcomm_session_clean */
/*
* Process all DLCs on the session. Caller MUST hold s->session_mtx.
*/
static void
ng_btsocket_rfcomm_session_process_pcb(ng_btsocket_rfcomm_session_p s)
{
ng_btsocket_rfcomm_pcb_p pcb = NULL, pcb_next = NULL;
struct socket *so = NULL;
int error;
mtx_assert(&s->session_mtx, MA_OWNED);
/*
* Note: cannot use LIST_FOREACH because ng_btsocket_rfcomm_pcb_kill
* will unlink DLC from the session
*/
for (pcb = LIST_FIRST(&s->dlcs); pcb != NULL; ) {
so = NULL;
mtx_lock(&pcb->pcb_mtx);
pcb_next = LIST_NEXT(pcb, session_next);
switch (pcb->state) {
/*
* If DLC in W4_CONNECT state then we should check for both
* timeout and detach.
*/
case NG_BTSOCKET_RFCOMM_DLC_W4_CONNECT:
if (pcb->flags & NG_BTSOCKET_RFCOMM_DLC_DETACHED) {
if (ng_btsocket_rfcomm_pcb_kill(pcb, 0))
so = pcb->so;
} else if (pcb->flags & NG_BTSOCKET_RFCOMM_DLC_TIMEDOUT)
if (ng_btsocket_rfcomm_pcb_kill(pcb, ETIMEDOUT))
so = pcb->so;
break;
/*
* If DLC in CONFIGURING or CONNECTING state then we only
* should check for timeout. If detach() was called then
* DLC will be moved into DISCONNECTING state.
*/
case NG_BTSOCKET_RFCOMM_DLC_CONFIGURING:
case NG_BTSOCKET_RFCOMM_DLC_CONNECTING:
if (pcb->flags & NG_BTSOCKET_RFCOMM_DLC_TIMEDOUT)
if (ng_btsocket_rfcomm_pcb_kill(pcb, ETIMEDOUT))
so = pcb->so;
break;
/*
* If DLC in CONNECTED state then we need to send data (if any)
* from the socket's send queue. Note that we will send data
* from either all sockets or none. This may overload session's
* outgoing queue (but we do not check for that).
*
* XXX FIXME need scheduler for RFCOMM sockets
*/
case NG_BTSOCKET_RFCOMM_DLC_CONNECTED:
error = ng_btsocket_rfcomm_pcb_send(pcb, ALOT);
if (error != 0)
if (ng_btsocket_rfcomm_pcb_kill(pcb, error))
so = pcb->so;
break;
/*
* If DLC in DISCONNECTING state then we must send DISC frame.
* Note that if DLC has timeout set then we do not need to
* resend DISC frame.
*
* XXX FIXME need to drain all data from the socket's queue
* if LINGER option was set
*/
case NG_BTSOCKET_RFCOMM_DLC_DISCONNECTING:
if (!(pcb->flags & NG_BTSOCKET_RFCOMM_DLC_TIMO)) {
error = ng_btsocket_rfcomm_send_command(
pcb->session, RFCOMM_FRAME_DISC,
pcb->dlci);
if (error == 0)
ng_btsocket_rfcomm_timeout(pcb);
else if (ng_btsocket_rfcomm_pcb_kill(pcb,error))
so = pcb->so;
} else if (pcb->flags & NG_BTSOCKET_RFCOMM_DLC_TIMEDOUT)
if (ng_btsocket_rfcomm_pcb_kill(pcb, ETIMEDOUT))
so = pcb->so;
break;
/* case NG_BTSOCKET_RFCOMM_DLC_CLOSED: */
default:
panic("%s: Invalid DLC state=%d, flags=%#x\n",
__func__, pcb->state, pcb->flags);
break;
}
mtx_unlock(&pcb->pcb_mtx);
pcb = pcb_next;
if (so != NULL)
ng_btsocket_rfcomm_detach(so);
}
} /* ng_btsocket_rfcomm_session_process_pcb */
/*
* Find RFCOMM session between "src" and "dst".
* Caller MUST hold ng_btsocket_rfcomm_sessions_mtx.
*/
static ng_btsocket_rfcomm_session_p
ng_btsocket_rfcomm_session_by_addr(bdaddr_p src, bdaddr_p dst)
{
ng_btsocket_rfcomm_session_p s = NULL;
ng_btsocket_l2cap_pcb_p l2pcb = NULL;
int any_src;
mtx_assert(&ng_btsocket_rfcomm_sessions_mtx, MA_OWNED);
any_src = (bcmp(src, NG_HCI_BDADDR_ANY, sizeof(*src)) == 0);
LIST_FOREACH(s, &ng_btsocket_rfcomm_sessions, next) {
l2pcb = so2l2cap_pcb(s->l2so);
if ((any_src || bcmp(&l2pcb->src, src, sizeof(*src)) == 0) &&
bcmp(&l2pcb->dst, dst, sizeof(*dst)) == 0)
break;
}
return (s);
} /* ng_btsocket_rfcomm_session_by_addr */
/*****************************************************************************
*****************************************************************************
** RFCOMM
*****************************************************************************
*****************************************************************************/
/*
* Process incoming RFCOMM frame. Caller must hold s->session_mtx.
* XXX FIXME check frame length
*/
static int
ng_btsocket_rfcomm_receive_frame(ng_btsocket_rfcomm_session_p s,
struct mbuf *m0)
{
struct rfcomm_frame_hdr *hdr = NULL;
struct mbuf *m = NULL;
u_int16_t length;
u_int8_t dlci, type;
int error = 0;
mtx_assert(&s->session_mtx, MA_OWNED);
/* Pullup as much as we can into first mbuf (for direct access) */
length = min(m0->m_pkthdr.len, MHLEN);
if (m0->m_len < length) {
if ((m0 = m_pullup(m0, length)) == NULL) {
NG_BTSOCKET_RFCOMM_ALERT(
"%s: m_pullup(%d) failed\n", __func__, length);
return (ENOBUFS);
}
}
hdr = mtod(m0, struct rfcomm_frame_hdr *);
dlci = RFCOMM_DLCI(hdr->address);
type = RFCOMM_TYPE(hdr->control);
/* Test EA bit in length. If not set then we have 2 bytes of length */
if (!RFCOMM_EA(hdr->length)) {
bcopy(&hdr->length, &length, sizeof(length));
length = le16toh(length);
m_adj(m0, sizeof(*hdr) + 1);
} else {
length = hdr->length >> 1;
m_adj(m0, sizeof(*hdr));
}
NG_BTSOCKET_RFCOMM_INFO(
"%s: Got frame type=%#x, dlci=%d, length=%d, cr=%d, pf=%d, len=%d\n",
__func__, type, dlci, length, RFCOMM_CR(hdr->address),
RFCOMM_PF(hdr->control), m0->m_pkthdr.len);
/*
* Get FCS (the last byte in the frame)
* XXX this will not work if mbuf chain ends with empty mbuf.
* XXX let's hope it never happens :)
*/
for (m = m0; m->m_next != NULL; m = m->m_next)
;
if (m->m_len <= 0)
panic("%s: Empty mbuf at the end of the chain, len=%d\n",
__func__, m->m_len);
/*
* Check FCS. We only need to calculate FCS on first 2 or 3 bytes
* and already m_pullup'ed mbuf chain, so it should be safe.
*/
if (ng_btsocket_rfcomm_check_fcs((u_int8_t *) hdr, type, m->m_data[m->m_len - 1])) {
NG_BTSOCKET_RFCOMM_ERR(
"%s: Invalid RFCOMM packet. Bad checksum\n", __func__);
NG_FREE_M(m0);
return (EINVAL);
}
m_adj(m0, -1); /* Trim FCS byte */
/*
* Process RFCOMM frame.
*
* From TS 07.10 spec
*
* "... In the case where a SABM or DISC command with the P bit set
* to 0 is received then the received frame shall be discarded..."
*
* "... If a unsolicited DM response is received then the frame shall
* be processed irrespective of the P/F setting... "
*
* "... The station may transmit response frames with the F bit set
* to 0 at any opportunity on an asynchronous basis. However, in the
* case where a UA response is received with the F bit set to 0 then
* the received frame shall be discarded..."
*
* From Bluetooth spec
*
* "... When credit based flow control is being used, the meaning of
* the P/F bit in the control field of the RFCOMM header is redefined
* for UIH frames..."
*/
switch (type) {
case RFCOMM_FRAME_SABM:
if (RFCOMM_PF(hdr->control))
error = ng_btsocket_rfcomm_receive_sabm(s, dlci);
break;
case RFCOMM_FRAME_DISC:
if (RFCOMM_PF(hdr->control))
error = ng_btsocket_rfcomm_receive_disc(s, dlci);
break;
case RFCOMM_FRAME_UA:
if (RFCOMM_PF(hdr->control))
error = ng_btsocket_rfcomm_receive_ua(s, dlci);
break;
case RFCOMM_FRAME_DM:
error = ng_btsocket_rfcomm_receive_dm(s, dlci);
break;
case RFCOMM_FRAME_UIH:
if (dlci == 0)
error = ng_btsocket_rfcomm_receive_mcc(s, m0);
else
error = ng_btsocket_rfcomm_receive_uih(s, dlci,
RFCOMM_PF(hdr->control), m0);
return (error);
/* NOT REACHED */
default:
NG_BTSOCKET_RFCOMM_ERR(
"%s: Invalid RFCOMM packet. Unknown type=%#x\n", __func__, type);
error = EINVAL;
break;
}
NG_FREE_M(m0);
return (error);
} /* ng_btsocket_rfcomm_receive_frame */
/*
* Process RFCOMM SABM frame
*/
static int
ng_btsocket_rfcomm_receive_sabm(ng_btsocket_rfcomm_session_p s, int dlci)
{
ng_btsocket_rfcomm_pcb_p pcb = NULL;
struct socket *so = NULL;
int error = 0;
mtx_assert(&s->session_mtx, MA_OWNED);
NG_BTSOCKET_RFCOMM_INFO(
"%s: Got SABM, session state=%d, flags=%#x, mtu=%d, dlci=%d\n",
__func__, s->state, s->flags, s->mtu, dlci);
/* DLCI == 0 means open multiplexor channel */
if (dlci == 0) {
switch (s->state) {
case NG_BTSOCKET_RFCOMM_SESSION_CONNECTED:
case NG_BTSOCKET_RFCOMM_SESSION_OPEN:
error = ng_btsocket_rfcomm_send_command(s,
RFCOMM_FRAME_UA, dlci);
if (error == 0) {
s->state = NG_BTSOCKET_RFCOMM_SESSION_OPEN;
ng_btsocket_rfcomm_connect_cfm(s);
} else {
s->state = NG_BTSOCKET_RFCOMM_SESSION_CLOSED;
ng_btsocket_rfcomm_session_clean(s);
}
break;
default:
NG_BTSOCKET_RFCOMM_WARN(
"%s: Got SABM for session in invalid state state=%d, flags=%#x\n",
__func__, s->state, s->flags);
error = EINVAL;
break;
}
return (error);
}
/* Make sure multiplexor channel is open */
if (s->state != NG_BTSOCKET_RFCOMM_SESSION_OPEN) {
NG_BTSOCKET_RFCOMM_ERR(
"%s: Got SABM for dlci=%d with mulitplexor channel closed, state=%d, " \
"flags=%#x\n", __func__, dlci, s->state, s->flags);
return (EINVAL);
}
/*
* Check if we have this DLCI. This might happen when remote
* peer uses PN command before actual open (SABM) happens.
*/
pcb = ng_btsocket_rfcomm_pcb_by_dlci(s, dlci);
if (pcb != NULL) {
mtx_lock(&pcb->pcb_mtx);
if (pcb->state != NG_BTSOCKET_RFCOMM_DLC_CONNECTING) {
NG_BTSOCKET_RFCOMM_ERR(
"%s: Got SABM for dlci=%d in invalid state=%d, flags=%#x\n",
__func__, dlci, pcb->state, pcb->flags);
mtx_unlock(&pcb->pcb_mtx);
return (ENOENT);
}
ng_btsocket_rfcomm_untimeout(pcb);
error = ng_btsocket_rfcomm_send_command(s,RFCOMM_FRAME_UA,dlci);
if (error == 0)
error = ng_btsocket_rfcomm_send_msc(pcb);
if (error == 0) {
pcb->state = NG_BTSOCKET_RFCOMM_DLC_CONNECTED;
soisconnected(pcb->so);
} else if (ng_btsocket_rfcomm_pcb_kill(pcb, error))
so = pcb->so;
mtx_unlock(&pcb->pcb_mtx);
if (so != NULL)
ng_btsocket_rfcomm_detach(so);
return (error);
}
/*
* We do not have requested DLCI, so it must be an incoming connection
* with default parameters. Try to accept it.
*/
pcb = ng_btsocket_rfcomm_connect_ind(s, RFCOMM_SRVCHANNEL(dlci));
if (pcb != NULL) {
mtx_lock(&pcb->pcb_mtx);
pcb->dlci = dlci;
error = ng_btsocket_rfcomm_send_command(s,RFCOMM_FRAME_UA,dlci);
if (error == 0)
error = ng_btsocket_rfcomm_send_msc(pcb);
if (error == 0) {
pcb->state = NG_BTSOCKET_RFCOMM_DLC_CONNECTED;
soisconnected(pcb->so);
} else if (ng_btsocket_rfcomm_pcb_kill(pcb, error))
so = pcb->so;
mtx_unlock(&pcb->pcb_mtx);
if (so != NULL)
ng_btsocket_rfcomm_detach(so);
} else
/* Nobody is listen()ing on the requested DLCI */
error = ng_btsocket_rfcomm_send_command(s,RFCOMM_FRAME_DM,dlci);
return (error);
} /* ng_btsocket_rfcomm_receive_sabm */
/*
* Process RFCOMM DISC frame
*/
static int
ng_btsocket_rfcomm_receive_disc(ng_btsocket_rfcomm_session_p s, int dlci)
{
ng_btsocket_rfcomm_pcb_p pcb = NULL;
int error = 0;
mtx_assert(&s->session_mtx, MA_OWNED);
NG_BTSOCKET_RFCOMM_INFO(
"%s: Got DISC, session state=%d, flags=%#x, mtu=%d, dlci=%d\n",
__func__, s->state, s->flags, s->mtu, dlci);
/* DLCI == 0 means close multiplexor channel */
if (dlci == 0) {
/* XXX FIXME assume that remote side will close the socket */
error = ng_btsocket_rfcomm_send_command(s, RFCOMM_FRAME_UA, 0);
if (error == 0) {
if (s->state == NG_BTSOCKET_RFCOMM_SESSION_DISCONNECTING)
s->state = NG_BTSOCKET_RFCOMM_SESSION_CLOSED; /* XXX */
else
s->state = NG_BTSOCKET_RFCOMM_SESSION_DISCONNECTING;
} else
s->state = NG_BTSOCKET_RFCOMM_SESSION_CLOSED; /* XXX */
ng_btsocket_rfcomm_session_clean(s);
} else {
pcb = ng_btsocket_rfcomm_pcb_by_dlci(s, dlci);
if (pcb != NULL) {
struct socket *so = NULL;
int err;
mtx_lock(&pcb->pcb_mtx);
NG_BTSOCKET_RFCOMM_INFO(
"%s: Got DISC for dlci=%d, state=%d, flags=%#x\n",
__func__, dlci, pcb->state, pcb->flags);
error = ng_btsocket_rfcomm_send_command(s,
RFCOMM_FRAME_UA, dlci);
if (pcb->state == NG_BTSOCKET_RFCOMM_DLC_CONNECTED)
err = 0;
else
err = ECONNREFUSED;
if (ng_btsocket_rfcomm_pcb_kill(pcb, err))
so = pcb->so;
mtx_unlock(&pcb->pcb_mtx);
if (so != NULL)
ng_btsocket_rfcomm_detach(so);
} else {
NG_BTSOCKET_RFCOMM_WARN(
"%s: Got DISC for non-existing dlci=%d\n", __func__, dlci);
error = ng_btsocket_rfcomm_send_command(s,
RFCOMM_FRAME_DM, dlci);
}
}
return (error);
} /* ng_btsocket_rfcomm_receive_disc */
/*
* Process RFCOMM UA frame
*/
static int
ng_btsocket_rfcomm_receive_ua(ng_btsocket_rfcomm_session_p s, int dlci)
{
ng_btsocket_rfcomm_pcb_p pcb = NULL;
int error = 0;
mtx_assert(&s->session_mtx, MA_OWNED);
NG_BTSOCKET_RFCOMM_INFO(
"%s: Got UA, session state=%d, flags=%#x, mtu=%d, dlci=%d\n",
__func__, s->state, s->flags, s->mtu, dlci);
/* dlci == 0 means multiplexor channel */
if (dlci == 0) {
switch (s->state) {
case NG_BTSOCKET_RFCOMM_SESSION_CONNECTED:
s->state = NG_BTSOCKET_RFCOMM_SESSION_OPEN;
ng_btsocket_rfcomm_connect_cfm(s);
break;
case NG_BTSOCKET_RFCOMM_SESSION_DISCONNECTING:
s->state = NG_BTSOCKET_RFCOMM_SESSION_CLOSED;
ng_btsocket_rfcomm_session_clean(s);
break;
default:
NG_BTSOCKET_RFCOMM_WARN(
"%s: Got UA for session in invalid state=%d(%d), flags=%#x, mtu=%d\n",
__func__, s->state, INITIATOR(s), s->flags,
s->mtu);
error = ENOENT;
break;
}
return (error);
}
/* Check if we have this DLCI */
pcb = ng_btsocket_rfcomm_pcb_by_dlci(s, dlci);
if (pcb != NULL) {
struct socket *so = NULL;
mtx_lock(&pcb->pcb_mtx);
NG_BTSOCKET_RFCOMM_INFO(
"%s: Got UA for dlci=%d, state=%d, flags=%#x\n",
__func__, dlci, pcb->state, pcb->flags);
switch (pcb->state) {
case NG_BTSOCKET_RFCOMM_DLC_CONNECTING:
ng_btsocket_rfcomm_untimeout(pcb);
error = ng_btsocket_rfcomm_send_msc(pcb);
if (error == 0) {
pcb->state = NG_BTSOCKET_RFCOMM_DLC_CONNECTED;
soisconnected(pcb->so);
}
break;
case NG_BTSOCKET_RFCOMM_DLC_DISCONNECTING:
if (ng_btsocket_rfcomm_pcb_kill(pcb, 0))
so = pcb->so;
break;
default:
NG_BTSOCKET_RFCOMM_WARN(
"%s: Got UA for dlci=%d in invalid state=%d, flags=%#x\n",
__func__, dlci, pcb->state, pcb->flags);
error = ENOENT;
break;
}
mtx_unlock(&pcb->pcb_mtx);
if (so != NULL)
ng_btsocket_rfcomm_detach(so);
} else {
NG_BTSOCKET_RFCOMM_WARN(
"%s: Got UA for non-existing dlci=%d\n", __func__, dlci);
error = ng_btsocket_rfcomm_send_command(s,RFCOMM_FRAME_DM,dlci);
}
return (error);
} /* ng_btsocket_rfcomm_receive_ua */
/*
* Process RFCOMM DM frame
*/
static int
ng_btsocket_rfcomm_receive_dm(ng_btsocket_rfcomm_session_p s, int dlci)
{
ng_btsocket_rfcomm_pcb_p pcb = NULL;
int error;
mtx_assert(&s->session_mtx, MA_OWNED);
NG_BTSOCKET_RFCOMM_INFO(
"%s: Got DM, session state=%d, flags=%#x, mtu=%d, dlci=%d\n",
__func__, s->state, s->flags, s->mtu, dlci);
/* DLCI == 0 means multiplexor channel */
if (dlci == 0) {
/* Disconnect all dlc's on the session */
s->state = NG_BTSOCKET_RFCOMM_SESSION_CLOSED;
ng_btsocket_rfcomm_session_clean(s);
} else {
pcb = ng_btsocket_rfcomm_pcb_by_dlci(s, dlci);
if (pcb != NULL) {
struct socket *so = NULL;
mtx_lock(&pcb->pcb_mtx);
NG_BTSOCKET_RFCOMM_INFO(
"%s: Got DM for dlci=%d, state=%d, flags=%#x\n",
__func__, dlci, pcb->state, pcb->flags);
if (pcb->state == NG_BTSOCKET_RFCOMM_DLC_CONNECTED)
error = ECONNRESET;
else
error = ECONNREFUSED;
if (ng_btsocket_rfcomm_pcb_kill(pcb, error))
so = pcb->so;
mtx_unlock(&pcb->pcb_mtx);
if (so != NULL)
ng_btsocket_rfcomm_detach(so);
} else
NG_BTSOCKET_RFCOMM_WARN(
"%s: Got DM for non-existing dlci=%d\n", __func__, dlci);
}
return (0);
} /* ng_btsocket_rfcomm_receive_dm */
/*
* Process RFCOMM UIH frame (data)
*/
static int
ng_btsocket_rfcomm_receive_uih(ng_btsocket_rfcomm_session_p s, int dlci,
int pf, struct mbuf *m0)
{
ng_btsocket_rfcomm_pcb_p pcb = NULL;
int error = 0;
mtx_assert(&s->session_mtx, MA_OWNED);
NG_BTSOCKET_RFCOMM_INFO(
"%s: Got UIH, session state=%d, flags=%#x, mtu=%d, dlci=%d, pf=%d, len=%d\n",
__func__, s->state, s->flags, s->mtu, dlci, pf,
m0->m_pkthdr.len);
/* XXX should we do it here? Check for session flow control */
if (s->flags & NG_BTSOCKET_RFCOMM_SESSION_LFC) {
NG_BTSOCKET_RFCOMM_WARN(
"%s: Got UIH with session flow control asserted, state=%d, flags=%#x\n",
__func__, s->state, s->flags);
goto drop;
}
/* Check if we have this dlci */
pcb = ng_btsocket_rfcomm_pcb_by_dlci(s, dlci);
if (pcb == NULL) {
NG_BTSOCKET_RFCOMM_WARN(
"%s: Got UIH for non-existing dlci=%d\n", __func__, dlci);
error = ng_btsocket_rfcomm_send_command(s,RFCOMM_FRAME_DM,dlci);
goto drop;
}
mtx_lock(&pcb->pcb_mtx);
/* Check dlci state */
if (pcb->state != NG_BTSOCKET_RFCOMM_DLC_CONNECTED) {
NG_BTSOCKET_RFCOMM_WARN(
"%s: Got UIH for dlci=%d in invalid state=%d, flags=%#x\n",
__func__, dlci, pcb->state, pcb->flags);
error = EINVAL;
goto drop1;
}
/* Check dlci flow control */
if (((pcb->flags & NG_BTSOCKET_RFCOMM_DLC_CFC) && pcb->rx_cred <= 0) ||
(pcb->lmodem & RFCOMM_MODEM_FC)) {
NG_BTSOCKET_RFCOMM_ERR(
"%s: Got UIH for dlci=%d with asserted flow control, state=%d, " \
"flags=%#x, rx_cred=%d, lmodem=%#x\n",
__func__, dlci, pcb->state, pcb->flags,
pcb->rx_cred, pcb->lmodem);
goto drop1;
}
/* Did we get any credits? */
if ((pcb->flags & NG_BTSOCKET_RFCOMM_DLC_CFC) && pf) {
NG_BTSOCKET_RFCOMM_INFO(
"%s: Got %d more credits for dlci=%d, state=%d, flags=%#x, " \
"rx_cred=%d, tx_cred=%d\n",
__func__, *mtod(m0, u_int8_t *), dlci, pcb->state,
pcb->flags, pcb->rx_cred, pcb->tx_cred);
pcb->tx_cred += *mtod(m0, u_int8_t *);
m_adj(m0, 1);
/* Send more from the DLC. XXX check for errors? */
ng_btsocket_rfcomm_pcb_send(pcb, ALOT);
}
/* OK the of the rest of the mbuf is the data */
if (m0->m_pkthdr.len > 0) {
/* If we are using credit flow control decrease rx_cred here */
if (pcb->flags & NG_BTSOCKET_RFCOMM_DLC_CFC) {
/* Give remote peer more credits (if needed) */
if (-- pcb->rx_cred <= RFCOMM_MAX_CREDITS / 2)
ng_btsocket_rfcomm_send_credits(pcb);
else
NG_BTSOCKET_RFCOMM_INFO(
"%s: Remote side still has credits, dlci=%d, state=%d, flags=%#x, " \
"rx_cred=%d, tx_cred=%d\n", __func__, dlci, pcb->state, pcb->flags,
pcb->rx_cred, pcb->tx_cred);
}
/* Check packet against mtu on dlci */
if (m0->m_pkthdr.len > pcb->mtu) {
NG_BTSOCKET_RFCOMM_ERR(
"%s: Got oversized UIH for dlci=%d, state=%d, flags=%#x, mtu=%d, len=%d\n",
__func__, dlci, pcb->state, pcb->flags,
pcb->mtu, m0->m_pkthdr.len);
error = EMSGSIZE;
} else if (m0->m_pkthdr.len > sbspace(&pcb->so->so_rcv)) {
/*
* This is really bad. Receive queue on socket does
* not have enough space for the packet. We do not
* have any other choice but drop the packet.
*/
NG_BTSOCKET_RFCOMM_ERR(
"%s: Not enough space in socket receive queue. Dropping UIH for dlci=%d, " \
"state=%d, flags=%#x, len=%d, space=%ld\n",
__func__, dlci, pcb->state, pcb->flags,
m0->m_pkthdr.len, sbspace(&pcb->so->so_rcv));
error = ENOBUFS;
} else {
/* Append packet to the socket receive queue */
sbappend(&pcb->so->so_rcv, m0);
m0 = NULL;
sorwakeup(pcb->so);
}
}
drop1:
mtx_unlock(&pcb->pcb_mtx);
drop:
NG_FREE_M(m0); /* checks for != NULL */
return (error);
} /* ng_btsocket_rfcomm_receive_uih */
/*
* Process RFCOMM MCC command (Multiplexor)
*
* From TS 07.10 spec
*
* "5.4.3.1 Information Data
*
* ...The frames (UIH) sent by the initiating station have the C/R bit set
* to 1 and those sent by the responding station have the C/R bit set to 0..."
*
* "5.4.6.2 Operating procedures
*
* Messages always exist in pairs; a command message and a corresponding
* response message. If the C/R bit is set to 1 the message is a command,
* if it is set to 0 the message is a response...
*
* ...
*
* NOTE: Notice that when UIH frames are used to convey information on DLCI 0
* there are at least two different fields that contain a C/R bit, and the
* bits are set of different form. The C/R bit in the Type field shall be set
* as it is stated above, while the C/R bit in the Address field (see subclause
* 5.2.1.2) shall be set as it is described in subclause 5.4.3.1."
*/
static int
ng_btsocket_rfcomm_receive_mcc(ng_btsocket_rfcomm_session_p s, struct mbuf *m0)
{
struct rfcomm_mcc_hdr *hdr = NULL;
u_int8_t cr, type, length;
mtx_assert(&s->session_mtx, MA_OWNED);
/*
* We can access data directly in the first mbuf, because we have
* m_pullup()'ed mbuf chain in ng_btsocket_rfcomm_receive_frame().
* All MCC commands should fit into single mbuf (except probably TEST).
*/
hdr = mtod(m0, struct rfcomm_mcc_hdr *);
cr = RFCOMM_CR(hdr->type);
type = RFCOMM_MCC_TYPE(hdr->type);
length = RFCOMM_MCC_LENGTH(hdr->length);
/* Check MCC frame length */
if (sizeof(*hdr) + length != m0->m_pkthdr.len) {
NG_BTSOCKET_RFCOMM_ERR(
"%s: Invalid MCC frame length=%d, len=%d\n",
__func__, length, m0->m_pkthdr.len);
NG_FREE_M(m0);
return (EMSGSIZE);
}
switch (type) {
case RFCOMM_MCC_TEST:
return (ng_btsocket_rfcomm_receive_test(s, m0));
/* NOT REACHED */
case RFCOMM_MCC_FCON:
case RFCOMM_MCC_FCOFF:
return (ng_btsocket_rfcomm_receive_fc(s, m0));
/* NOT REACHED */
case RFCOMM_MCC_MSC:
return (ng_btsocket_rfcomm_receive_msc(s, m0));
/* NOT REACHED */
case RFCOMM_MCC_RPN:
return (ng_btsocket_rfcomm_receive_rpn(s, m0));
/* NOT REACHED */
case RFCOMM_MCC_RLS:
return (ng_btsocket_rfcomm_receive_rls(s, m0));
/* NOT REACHED */
case RFCOMM_MCC_PN:
return (ng_btsocket_rfcomm_receive_pn(s, m0));
/* NOT REACHED */
case RFCOMM_MCC_NSC:
NG_BTSOCKET_RFCOMM_ERR(
"%s: Got MCC NSC, type=%#x, cr=%d, length=%d, session state=%d, flags=%#x, " \
"mtu=%d, len=%d\n", __func__, RFCOMM_MCC_TYPE(*((u_int8_t *)(hdr + 1))), cr,
length, s->state, s->flags, s->mtu, m0->m_pkthdr.len);
NG_FREE_M(m0);
break;
default:
NG_BTSOCKET_RFCOMM_ERR(
"%s: Got unknown MCC, type=%#x, cr=%d, length=%d, session state=%d, " \
"flags=%#x, mtu=%d, len=%d\n",
__func__, type, cr, length, s->state, s->flags,
s->mtu, m0->m_pkthdr.len);
/* Reuse mbuf to send NSC */
hdr = mtod(m0, struct rfcomm_mcc_hdr *);
m0->m_pkthdr.len = m0->m_len = sizeof(*hdr);
/* Create MCC NSC header */
hdr->type = RFCOMM_MKMCC_TYPE(0, RFCOMM_MCC_NSC);
hdr->length = RFCOMM_MKLEN8(1);
/* Put back MCC command type we did not like */
m0->m_data[m0->m_len] = RFCOMM_MKMCC_TYPE(cr, type);
m0->m_pkthdr.len ++;
m0->m_len ++;
/* Send UIH frame */
return (ng_btsocket_rfcomm_send_uih(s,
RFCOMM_MKADDRESS(INITIATOR(s), 0), 0, 0, m0));
/* NOT REACHED */
}
return (0);
} /* ng_btsocket_rfcomm_receive_mcc */
/*
* Receive RFCOMM TEST MCC command
*/
static int
ng_btsocket_rfcomm_receive_test(ng_btsocket_rfcomm_session_p s, struct mbuf *m0)
{
struct rfcomm_mcc_hdr *hdr = mtod(m0, struct rfcomm_mcc_hdr *);
int error = 0;
mtx_assert(&s->session_mtx, MA_OWNED);
NG_BTSOCKET_RFCOMM_INFO(
"%s: Got MCC TEST, cr=%d, length=%d, session state=%d, flags=%#x, mtu=%d, " \
"len=%d\n", __func__, RFCOMM_CR(hdr->type), RFCOMM_MCC_LENGTH(hdr->length),
s->state, s->flags, s->mtu, m0->m_pkthdr.len);
if (RFCOMM_CR(hdr->type)) {
hdr->type = RFCOMM_MKMCC_TYPE(0, RFCOMM_MCC_TEST);
error = ng_btsocket_rfcomm_send_uih(s,
RFCOMM_MKADDRESS(INITIATOR(s), 0), 0, 0, m0);
} else
NG_FREE_M(m0); /* XXX ignore response */
return (error);
} /* ng_btsocket_rfcomm_receive_test */
/*
* Receive RFCOMM FCON/FCOFF MCC command
*/
static int
ng_btsocket_rfcomm_receive_fc(ng_btsocket_rfcomm_session_p s, struct mbuf *m0)
{
struct rfcomm_mcc_hdr *hdr = mtod(m0, struct rfcomm_mcc_hdr *);
u_int8_t type = RFCOMM_MCC_TYPE(hdr->type);
int error = 0;
mtx_assert(&s->session_mtx, MA_OWNED);
/*
* Turn ON/OFF aggregate flow on the entire session. When remote peer
* asserted flow control no transmission shall occur except on dlci 0
* (control channel).
*/
NG_BTSOCKET_RFCOMM_INFO(
"%s: Got MCC FC%s, cr=%d, length=%d, session state=%d, flags=%#x, mtu=%d, " \
"len=%d\n", __func__, (type == RFCOMM_MCC_FCON)? "ON" : "OFF",
RFCOMM_CR(hdr->type), RFCOMM_MCC_LENGTH(hdr->length),
s->state, s->flags, s->mtu, m0->m_pkthdr.len);
if (RFCOMM_CR(hdr->type)) {
if (type == RFCOMM_MCC_FCON)
s->flags &= ~NG_BTSOCKET_RFCOMM_SESSION_RFC;
else
s->flags |= NG_BTSOCKET_RFCOMM_SESSION_RFC;
hdr->type = RFCOMM_MKMCC_TYPE(0, type);
error = ng_btsocket_rfcomm_send_uih(s,
RFCOMM_MKADDRESS(INITIATOR(s), 0), 0, 0, m0);
} else
NG_FREE_M(m0); /* XXX ignore response */
return (error);
} /* ng_btsocket_rfcomm_receive_fc */
/*
* Receive RFCOMM MSC MCC command
*/
static int
ng_btsocket_rfcomm_receive_msc(ng_btsocket_rfcomm_session_p s, struct mbuf *m0)
{
struct rfcomm_mcc_hdr *hdr = mtod(m0, struct rfcomm_mcc_hdr*);
struct rfcomm_mcc_msc *msc = (struct rfcomm_mcc_msc *)(hdr+1);
ng_btsocket_rfcomm_pcb_t *pcb = NULL;
int error = 0;
mtx_assert(&s->session_mtx, MA_OWNED);
NG_BTSOCKET_RFCOMM_INFO(
"%s: Got MCC MSC, dlci=%d, cr=%d, length=%d, session state=%d, flags=%#x, " \
"mtu=%d, len=%d\n",
__func__, RFCOMM_DLCI(msc->address), RFCOMM_CR(hdr->type),
RFCOMM_MCC_LENGTH(hdr->length), s->state, s->flags,
s->mtu, m0->m_pkthdr.len);
if (RFCOMM_CR(hdr->type)) {
pcb = ng_btsocket_rfcomm_pcb_by_dlci(s, RFCOMM_DLCI(msc->address));
if (pcb == NULL) {
NG_BTSOCKET_RFCOMM_WARN(
"%s: Got MSC command for non-existing dlci=%d\n",
__func__, RFCOMM_DLCI(msc->address));
NG_FREE_M(m0);
return (ENOENT);
}
mtx_lock(&pcb->pcb_mtx);
if (pcb->state != NG_BTSOCKET_RFCOMM_DLC_CONNECTING &&
pcb->state != NG_BTSOCKET_RFCOMM_DLC_CONNECTED) {
NG_BTSOCKET_RFCOMM_WARN(
"%s: Got MSC on dlci=%d in invalid state=%d\n",
__func__, RFCOMM_DLCI(msc->address),
pcb->state);
mtx_unlock(&pcb->pcb_mtx);
NG_FREE_M(m0);
return (EINVAL);
}
pcb->rmodem = msc->modem; /* Update remote port signals */
hdr->type = RFCOMM_MKMCC_TYPE(0, RFCOMM_MCC_MSC);
error = ng_btsocket_rfcomm_send_uih(s,
RFCOMM_MKADDRESS(INITIATOR(s), 0), 0, 0, m0);
#if 0 /* YYY */
/* Send more data from DLC. XXX check for errors? */
if (!(pcb->rmodem & RFCOMM_MODEM_FC) &&
!(pcb->flags & NG_BTSOCKET_RFCOMM_DLC_CFC))
ng_btsocket_rfcomm_pcb_send(pcb, ALOT);
#endif /* YYY */
mtx_unlock(&pcb->pcb_mtx);
} else
NG_FREE_M(m0); /* XXX ignore response */
return (error);
} /* ng_btsocket_rfcomm_receive_msc */
/*
* Receive RFCOMM RPN MCC command
* XXX FIXME do we need htole16/le16toh for RPN param_mask?
*/
static int
ng_btsocket_rfcomm_receive_rpn(ng_btsocket_rfcomm_session_p s, struct mbuf *m0)
{
struct rfcomm_mcc_hdr *hdr = mtod(m0, struct rfcomm_mcc_hdr *);
struct rfcomm_mcc_rpn *rpn = (struct rfcomm_mcc_rpn *)(hdr + 1);
int error = 0;
u_int16_t param_mask;
u_int8_t bit_rate, data_bits, stop_bits, parity,
flow_control, xon_char, xoff_char;
mtx_assert(&s->session_mtx, MA_OWNED);
NG_BTSOCKET_RFCOMM_INFO(
"%s: Got MCC RPN, dlci=%d, cr=%d, length=%d, session state=%d, flags=%#x, " \
"mtu=%d, len=%d\n",
__func__, RFCOMM_DLCI(rpn->dlci), RFCOMM_CR(hdr->type),
RFCOMM_MCC_LENGTH(hdr->length), s->state, s->flags,
s->mtu, m0->m_pkthdr.len);
if (RFCOMM_CR(hdr->type)) {
param_mask = RFCOMM_RPN_PM_ALL;
if (RFCOMM_MCC_LENGTH(hdr->length) == 1) {
/* Request - return default setting */
bit_rate = RFCOMM_RPN_BR_115200;
data_bits = RFCOMM_RPN_DATA_8;
stop_bits = RFCOMM_RPN_STOP_1;
parity = RFCOMM_RPN_PARITY_NONE;
flow_control = RFCOMM_RPN_FLOW_NONE;
xon_char = RFCOMM_RPN_XON_CHAR;
xoff_char = RFCOMM_RPN_XOFF_CHAR;
} else {
/*
* Ignore/accept bit_rate, 8 bits, 1 stop bit, no
* parity, no flow control lines, default XON/XOFF
* chars.
*/
bit_rate = rpn->bit_rate;
rpn->param_mask = le16toh(rpn->param_mask); /* XXX */
data_bits = RFCOMM_RPN_DATA_BITS(rpn->line_settings);
if (rpn->param_mask & RFCOMM_RPN_PM_DATA &&
data_bits != RFCOMM_RPN_DATA_8) {
data_bits = RFCOMM_RPN_DATA_8;
param_mask ^= RFCOMM_RPN_PM_DATA;
}
stop_bits = RFCOMM_RPN_STOP_BITS(rpn->line_settings);
if (rpn->param_mask & RFCOMM_RPN_PM_STOP &&
stop_bits != RFCOMM_RPN_STOP_1) {
stop_bits = RFCOMM_RPN_STOP_1;
param_mask ^= RFCOMM_RPN_PM_STOP;
}
parity = RFCOMM_RPN_PARITY(rpn->line_settings);
if (rpn->param_mask & RFCOMM_RPN_PM_PARITY &&
parity != RFCOMM_RPN_PARITY_NONE) {
parity = RFCOMM_RPN_PARITY_NONE;
param_mask ^= RFCOMM_RPN_PM_PARITY;
}
flow_control = rpn->flow_control;
if (rpn->param_mask & RFCOMM_RPN_PM_FLOW &&
flow_control != RFCOMM_RPN_FLOW_NONE) {
flow_control = RFCOMM_RPN_FLOW_NONE;
param_mask ^= RFCOMM_RPN_PM_FLOW;
}
xon_char = rpn->xon_char;
if (rpn->param_mask & RFCOMM_RPN_PM_XON &&
xon_char != RFCOMM_RPN_XON_CHAR) {
xon_char = RFCOMM_RPN_XON_CHAR;
param_mask ^= RFCOMM_RPN_PM_XON;
}
xoff_char = rpn->xoff_char;
if (rpn->param_mask & RFCOMM_RPN_PM_XOFF &&
xoff_char != RFCOMM_RPN_XOFF_CHAR) {
xoff_char = RFCOMM_RPN_XOFF_CHAR;
param_mask ^= RFCOMM_RPN_PM_XOFF;
}
}
rpn->bit_rate = bit_rate;
rpn->line_settings = RFCOMM_MKRPN_LINE_SETTINGS(data_bits,
stop_bits, parity);
rpn->flow_control = flow_control;
rpn->xon_char = xon_char;
rpn->xoff_char = xoff_char;
rpn->param_mask = htole16(param_mask); /* XXX */
m0->m_pkthdr.len = m0->m_len = sizeof(*hdr) + sizeof(*rpn);
hdr->type = RFCOMM_MKMCC_TYPE(0, RFCOMM_MCC_RPN);
error = ng_btsocket_rfcomm_send_uih(s,
RFCOMM_MKADDRESS(INITIATOR(s), 0), 0, 0, m0);
} else
NG_FREE_M(m0); /* XXX ignore response */
return (error);
} /* ng_btsocket_rfcomm_receive_rpn */
/*
* Receive RFCOMM RLS MCC command
*/
static int
ng_btsocket_rfcomm_receive_rls(ng_btsocket_rfcomm_session_p s, struct mbuf *m0)
{
struct rfcomm_mcc_hdr *hdr = mtod(m0, struct rfcomm_mcc_hdr *);
struct rfcomm_mcc_rls *rls = (struct rfcomm_mcc_rls *)(hdr + 1);
int error = 0;
mtx_assert(&s->session_mtx, MA_OWNED);
/*
* XXX FIXME Do we have to do anything else here? Remote peer tries to
* tell us something about DLCI. Just report what we have received and
* return back received values as required by TS 07.10 spec.
*/
NG_BTSOCKET_RFCOMM_INFO(
"%s: Got MCC RLS, dlci=%d, status=%#x, cr=%d, length=%d, session state=%d, " \
"flags=%#x, mtu=%d, len=%d\n",
__func__, RFCOMM_DLCI(rls->address), rls->status,
RFCOMM_CR(hdr->type), RFCOMM_MCC_LENGTH(hdr->length),
s->state, s->flags, s->mtu, m0->m_pkthdr.len);
if (RFCOMM_CR(hdr->type)) {
if (rls->status & 0x1)
NG_BTSOCKET_RFCOMM_ERR(
"%s: Got RLS dlci=%d, error=%#x\n", __func__, RFCOMM_DLCI(rls->address),
rls->status >> 1);
hdr->type = RFCOMM_MKMCC_TYPE(0, RFCOMM_MCC_RLS);
error = ng_btsocket_rfcomm_send_uih(s,
RFCOMM_MKADDRESS(INITIATOR(s), 0), 0, 0, m0);
} else
NG_FREE_M(m0); /* XXX ignore responses */
return (error);
} /* ng_btsocket_rfcomm_receive_rls */
/*
* Receive RFCOMM PN MCC command
*/
static int
ng_btsocket_rfcomm_receive_pn(ng_btsocket_rfcomm_session_p s, struct mbuf *m0)
{
struct rfcomm_mcc_hdr *hdr = mtod(m0, struct rfcomm_mcc_hdr*);
struct rfcomm_mcc_pn *pn = (struct rfcomm_mcc_pn *)(hdr+1);
ng_btsocket_rfcomm_pcb_t *pcb = NULL;
int error = 0;
mtx_assert(&s->session_mtx, MA_OWNED);
NG_BTSOCKET_RFCOMM_INFO(
"%s: Got MCC PN, dlci=%d, cr=%d, length=%d, flow_control=%#x, priority=%d, " \
"ack_timer=%d, mtu=%d, max_retrans=%d, credits=%d, session state=%d, " \
"flags=%#x, session mtu=%d, len=%d\n",
__func__, pn->dlci, RFCOMM_CR(hdr->type),
RFCOMM_MCC_LENGTH(hdr->length), pn->flow_control, pn->priority,
pn->ack_timer, le16toh(pn->mtu), pn->max_retrans, pn->credits,
s->state, s->flags, s->mtu, m0->m_pkthdr.len);
if (pn->dlci == 0) {
NG_BTSOCKET_RFCOMM_ERR("%s: Zero dlci in MCC PN\n", __func__);
NG_FREE_M(m0);
return (EINVAL);
}
/* Check if we have this dlci */
pcb = ng_btsocket_rfcomm_pcb_by_dlci(s, pn->dlci);
if (pcb != NULL) {
mtx_lock(&pcb->pcb_mtx);
if (RFCOMM_CR(hdr->type)) {
/* PN Request */
ng_btsocket_rfcomm_set_pn(pcb, 1, pn->flow_control,
pn->credits, pn->mtu);
if (pcb->flags & NG_BTSOCKET_RFCOMM_DLC_CFC) {
pn->flow_control = 0xe0;
pn->credits = RFCOMM_DEFAULT_CREDITS;
} else {
pn->flow_control = 0;
pn->credits = 0;
}
hdr->type = RFCOMM_MKMCC_TYPE(0, RFCOMM_MCC_PN);
error = ng_btsocket_rfcomm_send_uih(s,
RFCOMM_MKADDRESS(INITIATOR(s), 0),
0, 0, m0);
} else {
/* PN Response - proceed with SABM. Timeout still set */
if (pcb->state == NG_BTSOCKET_RFCOMM_DLC_CONFIGURING) {
ng_btsocket_rfcomm_set_pn(pcb, 0,
pn->flow_control, pn->credits, pn->mtu);
pcb->state = NG_BTSOCKET_RFCOMM_DLC_CONNECTING;
error = ng_btsocket_rfcomm_send_command(s,
RFCOMM_FRAME_SABM, pn->dlci);
} else
NG_BTSOCKET_RFCOMM_WARN(
"%s: Got PN response for dlci=%d in invalid state=%d\n",
__func__, pn->dlci, pcb->state);
NG_FREE_M(m0);
}
mtx_unlock(&pcb->pcb_mtx);
} else if (RFCOMM_CR(hdr->type)) {
/* PN request to non-existing dlci - incomming connection */
pcb = ng_btsocket_rfcomm_connect_ind(s,
RFCOMM_SRVCHANNEL(pn->dlci));
if (pcb != NULL) {
struct socket *so = NULL;
mtx_lock(&pcb->pcb_mtx);
pcb->dlci = pn->dlci;
ng_btsocket_rfcomm_set_pn(pcb, 1, pn->flow_control,
pn->credits, pn->mtu);
if (pcb->flags & NG_BTSOCKET_RFCOMM_DLC_CFC) {
pn->flow_control = 0xe0;
pn->credits = RFCOMM_DEFAULT_CREDITS;
} else {
pn->flow_control = 0;
pn->credits = 0;
}
hdr->type = RFCOMM_MKMCC_TYPE(0, RFCOMM_MCC_PN);
error = ng_btsocket_rfcomm_send_uih(s,
RFCOMM_MKADDRESS(INITIATOR(s), 0),
0, 0, m0);
if (error == 0) {
ng_btsocket_rfcomm_timeout(pcb);
pcb->state = NG_BTSOCKET_RFCOMM_DLC_CONNECTING;
soisconnecting(pcb->so);
} else if (ng_btsocket_rfcomm_pcb_kill(pcb, error))
so = pcb->so;
mtx_unlock(&pcb->pcb_mtx);
if (so != NULL)
ng_btsocket_rfcomm_detach(so);
} else {
/* Nobody is listen()ing on this channel */
error = ng_btsocket_rfcomm_send_command(s,
RFCOMM_FRAME_DM, pn->dlci);
NG_FREE_M(m0);
}
} else
NG_FREE_M(m0); /* XXX ignore response to non-existing dlci */
return (error);
} /* ng_btsocket_rfcomm_receive_pn */
/*
* Set PN parameters for dlci. Caller must hold pcb->pcb_mtx.
*
* From Bluetooth spec.
*
* "... The CL1 - CL4 field is completely redefined. (In TS07.10 this defines
* the convergence layer to use, which is not applicable to RFCOMM. In RFCOMM,
* in Bluetooth versions up to 1.0B, this field was forced to 0).
*
* In the PN request sent prior to a DLC establishment, this field must contain
* the value 15 (0xF), indicating support of credit based flow control in the
* sender. See Table 5.3 below. If the PN response contains any other value
* than 14 (0xE) in this field, it is inferred that the peer RFCOMM entity is
* not supporting the credit based flow control feature. (This is only possible
* if the peer RFCOMM implementation is only conforming to Bluetooth version
* 1.0B.) If a PN request is sent on an already open DLC, then this field must
* contain the value zero; it is not possible to set initial credits more
* than once per DLC activation. A responding implementation must set this
* field in the PN response to 14 (0xE), if (and only if) the value in the PN
* request was 15..."
*/
static void
ng_btsocket_rfcomm_set_pn(ng_btsocket_rfcomm_pcb_p pcb, u_int8_t cr,
u_int8_t flow_control, u_int8_t credits, u_int16_t mtu)
{
mtx_assert(&pcb->pcb_mtx, MA_OWNED);
pcb->mtu = le16toh(mtu);
if (cr) {
if (flow_control == 0xf0) {
pcb->flags |= NG_BTSOCKET_RFCOMM_DLC_CFC;
pcb->tx_cred = credits;
} else {
pcb->flags &= ~NG_BTSOCKET_RFCOMM_DLC_CFC;
pcb->tx_cred = 0;
}
} else {
if (flow_control == 0xe0) {
pcb->flags |= NG_BTSOCKET_RFCOMM_DLC_CFC;
pcb->tx_cred = credits;
} else {
pcb->flags &= ~NG_BTSOCKET_RFCOMM_DLC_CFC;
pcb->tx_cred = 0;
}
}
NG_BTSOCKET_RFCOMM_INFO(
"%s: cr=%d, dlci=%d, state=%d, flags=%#x, mtu=%d, rx_cred=%d, tx_cred=%d\n",
__func__, cr, pcb->dlci, pcb->state, pcb->flags, pcb->mtu,
pcb->rx_cred, pcb->tx_cred);
} /* ng_btsocket_rfcomm_set_pn */
/*
* Send RFCOMM SABM/DISC/UA/DM frames. Caller must hold s->session_mtx
*/
static int
ng_btsocket_rfcomm_send_command(ng_btsocket_rfcomm_session_p s,
u_int8_t type, u_int8_t dlci)
{
struct rfcomm_cmd_hdr *hdr = NULL;
struct mbuf *m = NULL;
int cr;
mtx_assert(&s->session_mtx, MA_OWNED);
NG_BTSOCKET_RFCOMM_INFO(
"%s: Sending command type %#x, session state=%d, flags=%#x, mtu=%d, dlci=%d\n",
__func__, type, s->state, s->flags, s->mtu, dlci);
switch (type) {
case RFCOMM_FRAME_SABM:
case RFCOMM_FRAME_DISC:
cr = INITIATOR(s);
break;
case RFCOMM_FRAME_UA:
case RFCOMM_FRAME_DM:
cr = !INITIATOR(s);
break;
default:
panic("%s: Invalid frame type=%#x\n", __func__, type);
return (EINVAL);
/* NOT REACHED */
}
MGETHDR(m, M_DONTWAIT, MT_DATA);
if (m == NULL)
return (ENOBUFS);
m->m_pkthdr.len = m->m_len = sizeof(*hdr);
hdr = mtod(m, struct rfcomm_cmd_hdr *);
hdr->address = RFCOMM_MKADDRESS(cr, dlci);
hdr->control = RFCOMM_MKCONTROL(type, 1);
hdr->length = RFCOMM_MKLEN8(0);
hdr->fcs = ng_btsocket_rfcomm_fcs3((u_int8_t *) hdr);
NG_BT_MBUFQ_ENQUEUE(&s->outq, m);
return (0);
} /* ng_btsocket_rfcomm_send_command */
/*
* Send RFCOMM UIH frame. Caller must hold s->session_mtx
*/
static int
ng_btsocket_rfcomm_send_uih(ng_btsocket_rfcomm_session_p s, u_int8_t address,
u_int8_t pf, u_int8_t credits, struct mbuf *data)
{
struct rfcomm_frame_hdr *hdr = NULL;
struct mbuf *m = NULL, *mcrc = NULL;
u_int16_t length;
mtx_assert(&s->session_mtx, MA_OWNED);
MGETHDR(m, M_DONTWAIT, MT_DATA);
if (m == NULL) {
NG_FREE_M(data);
return (ENOBUFS);
}
m->m_pkthdr.len = m->m_len = sizeof(*hdr);
MGET(mcrc, M_DONTWAIT, MT_DATA);
if (mcrc == NULL) {
NG_FREE_M(data);
return (ENOBUFS);
}
mcrc->m_len = 1;
/* Fill UIH frame header */
hdr = mtod(m, struct rfcomm_frame_hdr *);
hdr->address = address;
hdr->control = RFCOMM_MKCONTROL(RFCOMM_FRAME_UIH, pf);
/* Calculate FCS */
mcrc->m_data[0] = ng_btsocket_rfcomm_fcs2((u_int8_t *) hdr);
/* Put length back */
length = (data != NULL)? data->m_pkthdr.len : 0;
if (length > 127) {
u_int16_t l = htole16(RFCOMM_MKLEN16(length));
bcopy(&l, &hdr->length, sizeof(l));
m->m_pkthdr.len ++;
m->m_len ++;
} else
hdr->length = RFCOMM_MKLEN8(length);
if (pf) {
m->m_data[m->m_len] = credits;
m->m_pkthdr.len ++;
m->m_len ++;
}
/* Add payload */
if (data != NULL) {
m_cat(m, data);
m->m_pkthdr.len += length;
}
/* Put FCS back */
m_cat(m, mcrc);
m->m_pkthdr.len ++;
NG_BTSOCKET_RFCOMM_INFO(
"%s: Sending UIH state=%d, flags=%#x, address=%d, length=%d, pf=%d, " \
"credits=%d, len=%d\n",
__func__, s->state, s->flags, address, length, pf, credits,
m->m_pkthdr.len);
NG_BT_MBUFQ_ENQUEUE(&s->outq, m);
return (0);
} /* ng_btsocket_rfcomm_send_uih */
/*
* Send MSC request. Caller must hold pcb->pcb_mtx and pcb->session->session_mtx
*/
static int
ng_btsocket_rfcomm_send_msc(ng_btsocket_rfcomm_pcb_p pcb)
{
struct mbuf *m = NULL;
struct rfcomm_mcc_hdr *hdr = NULL;
struct rfcomm_mcc_msc *msc = NULL;
mtx_assert(&pcb->session->session_mtx, MA_OWNED);
mtx_assert(&pcb->pcb_mtx, MA_OWNED);
MGETHDR(m, M_DONTWAIT, MT_DATA);
if (m == NULL)
return (ENOBUFS);
m->m_pkthdr.len = m->m_len = sizeof(*hdr) + sizeof(*msc);
hdr = mtod(m, struct rfcomm_mcc_hdr *);
msc = (struct rfcomm_mcc_msc *)(hdr + 1);
hdr->type = RFCOMM_MKMCC_TYPE(1, RFCOMM_MCC_MSC);
hdr->length = RFCOMM_MKLEN8(sizeof(*msc));
msc->address = RFCOMM_MKADDRESS(1, pcb->dlci);
msc->modem = pcb->lmodem;
NG_BTSOCKET_RFCOMM_INFO(
"%s: Sending MSC dlci=%d, state=%d, flags=%#x, address=%d, modem=%#x\n",
__func__, pcb->dlci, pcb->state, pcb->flags, msc->address,
msc->modem);
return (ng_btsocket_rfcomm_send_uih(pcb->session,
RFCOMM_MKADDRESS(INITIATOR(pcb->session), 0), 0, 0, m));
} /* ng_btsocket_rfcomm_send_msc */
/*
* Send PN request. Caller must hold pcb->pcb_mtx and pcb->session->session_mtx
*/
static int
ng_btsocket_rfcomm_send_pn(ng_btsocket_rfcomm_pcb_p pcb)
{
struct mbuf *m = NULL;
struct rfcomm_mcc_hdr *hdr = NULL;
struct rfcomm_mcc_pn *pn = NULL;
mtx_assert(&pcb->session->session_mtx, MA_OWNED);
mtx_assert(&pcb->pcb_mtx, MA_OWNED);
MGETHDR(m, M_DONTWAIT, MT_DATA);
if (m == NULL)
return (ENOBUFS);
m->m_pkthdr.len = m->m_len = sizeof(*hdr) + sizeof(*pn);
hdr = mtod(m, struct rfcomm_mcc_hdr *);
pn = (struct rfcomm_mcc_pn *)(hdr + 1);
hdr->type = RFCOMM_MKMCC_TYPE(1, RFCOMM_MCC_PN);
hdr->length = RFCOMM_MKLEN8(sizeof(*pn));
pn->dlci = pcb->dlci;
/*
* Set default DLCI priority as described in GSM 07.10
* (ETSI TS 101 369) clause 5.6 page 42
*/
pn->priority = (pcb->dlci < 56)? (((pcb->dlci >> 3) << 3) + 7) : 61;
pn->ack_timer = 0;
pn->mtu = htole16(pcb->mtu);
pn->max_retrans = 0;
if (pcb->flags & NG_BTSOCKET_RFCOMM_DLC_CFC) {
pn->flow_control = 0xf0;
pn->credits = pcb->rx_cred;
} else {
pn->flow_control = 0;
pn->credits = 0;
}
NG_BTSOCKET_RFCOMM_INFO(
"%s: Sending PN dlci=%d, state=%d, flags=%#x, mtu=%d, flow_control=%#x, " \
"credits=%d\n", __func__, pcb->dlci, pcb->state, pcb->flags, pcb->mtu,
pn->flow_control, pn->credits);
return (ng_btsocket_rfcomm_send_uih(pcb->session,
RFCOMM_MKADDRESS(INITIATOR(pcb->session), 0), 0, 0, m));
} /* ng_btsocket_rfcomm_send_pn */
/*
* Calculate and send credits based on available space in receive buffer
*/
static int
ng_btsocket_rfcomm_send_credits(ng_btsocket_rfcomm_pcb_p pcb)
{
int error = 0;
u_int8_t credits;
mtx_assert(&pcb->pcb_mtx, MA_OWNED);
mtx_assert(&pcb->session->session_mtx, MA_OWNED);
NG_BTSOCKET_RFCOMM_INFO(
"%s: Sending more credits, dlci=%d, state=%d, flags=%#x, mtu=%d, " \
"space=%ld, tx_cred=%d, rx_cred=%d\n",
__func__, pcb->dlci, pcb->state, pcb->flags, pcb->mtu,
sbspace(&pcb->so->so_rcv), pcb->tx_cred, pcb->rx_cred);
credits = sbspace(&pcb->so->so_rcv) / pcb->mtu;
if (credits > 0) {
if (pcb->rx_cred + credits > RFCOMM_MAX_CREDITS)
credits = RFCOMM_MAX_CREDITS - pcb->rx_cred;
error = ng_btsocket_rfcomm_send_uih(
pcb->session,
RFCOMM_MKADDRESS(INITIATOR(pcb->session),
pcb->dlci), 1, credits, NULL);
if (error == 0) {
pcb->rx_cred += credits;
NG_BTSOCKET_RFCOMM_INFO(
"%s: Gave remote side %d more credits, dlci=%d, state=%d, flags=%#x, " \
"rx_cred=%d, tx_cred=%d\n", __func__, credits, pcb->dlci, pcb->state,
pcb->flags, pcb->rx_cred, pcb->tx_cred);
} else
NG_BTSOCKET_RFCOMM_ERR(
"%s: Could not send credits, error=%d, dlci=%d, state=%d, flags=%#x, " \
"mtu=%d, space=%ld, tx_cred=%d, rx_cred=%d\n",
__func__, error, pcb->dlci, pcb->state,
pcb->flags, pcb->mtu, sbspace(&pcb->so->so_rcv),
pcb->tx_cred, pcb->rx_cred);
}
return (error);
} /* ng_btsocket_rfcomm_send_credits */
/*****************************************************************************
*****************************************************************************
** RFCOMM DLCs
*****************************************************************************
*****************************************************************************/
/*
* Send data from socket send buffer
* Caller must hold pcb->pcb_mtx and pcb->session->session_mtx
*/
static int
ng_btsocket_rfcomm_pcb_send(ng_btsocket_rfcomm_pcb_p pcb, int limit)
{
struct mbuf *m = NULL;
int sent, length, error;
mtx_assert(&pcb->session->session_mtx, MA_OWNED);
mtx_assert(&pcb->pcb_mtx, MA_OWNED);
if (pcb->flags & NG_BTSOCKET_RFCOMM_DLC_CFC)
limit = min(limit, pcb->tx_cred);
else if (!(pcb->rmodem & RFCOMM_MODEM_FC))
limit = min(limit, RFCOMM_MAX_CREDITS); /* XXX ??? */
else
limit = 0;
if (limit == 0) {
NG_BTSOCKET_RFCOMM_INFO(
"%s: Could not send - remote flow control asserted, dlci=%d, flags=%#x, " \
"rmodem=%#x, tx_cred=%d\n",
__func__, pcb->dlci, pcb->flags, pcb->rmodem,
pcb->tx_cred);
return (0);
}
for (error = 0, sent = 0; sent < limit; sent ++) {
length = min(pcb->mtu, pcb->so->so_snd.sb_cc);
if (length == 0)
break;
/* Get the chunk from the socket's send buffer */
m = ng_btsocket_rfcomm_prepare_packet(&pcb->so->so_snd, length);
if (m == NULL) {
error = ENOBUFS;
break;
}
sbdrop(&pcb->so->so_snd, length);
error = ng_btsocket_rfcomm_send_uih(pcb->session,
RFCOMM_MKADDRESS(INITIATOR(pcb->session),
pcb->dlci), 0, 0, m);
if (error != 0)
break;
}
if (pcb->flags & NG_BTSOCKET_RFCOMM_DLC_CFC)
pcb->tx_cred -= sent;
if (error == 0 && sent > 0) {
pcb->flags &= ~NG_BTSOCKET_RFCOMM_DLC_SENDING;
sowwakeup(pcb->so);
}
return (error);
} /* ng_btsocket_rfcomm_pcb_send */
/*
* Unlink and disconnect DLC. If ng_btsocket_rfcomm_pcb_kill() returns
* non zero value than socket has no reference and has to be detached.
* Caller must hold pcb->pcb_mtx and pcb->session->session_mtx
*/
static int
ng_btsocket_rfcomm_pcb_kill(ng_btsocket_rfcomm_pcb_p pcb, int error)
{
ng_btsocket_rfcomm_session_p s = pcb->session;
mtx_assert(&pcb->session->session_mtx, MA_OWNED);
mtx_assert(&pcb->pcb_mtx, MA_OWNED);
NG_BTSOCKET_RFCOMM_INFO(
"%s: Killing DLC, so=%p, dlci=%d, state=%d, flags=%#x, error=%d\n",
__func__, pcb->so, pcb->dlci, pcb->state, pcb->flags, error);
if (pcb->session == NULL)
panic("%s: DLC without session, pcb=%p, state=%d, flags=%#x\n",
__func__, pcb, pcb->state, pcb->flags);
if (pcb->flags & NG_BTSOCKET_RFCOMM_DLC_TIMO)
ng_btsocket_rfcomm_untimeout(pcb);
/* Detach DLC from the session. Does not matter which state DLC in */
LIST_REMOVE(pcb, session_next);
pcb->session = NULL;
/* Change DLC state and wakeup all sleepers */
pcb->state = NG_BTSOCKET_RFCOMM_DLC_CLOSED;
pcb->so->so_error = error;
soisdisconnected(pcb->so);
wakeup(&pcb->state);
/* Check if we have any DLCs left on the session */
if (LIST_EMPTY(&s->dlcs) && INITIATOR(s)) {
NG_BTSOCKET_RFCOMM_INFO(
"%s: Disconnecting session, state=%d, flags=%#x, mtu=%d\n",
__func__, s->state, s->flags, s->mtu);
switch (s->state) {
case NG_BTSOCKET_RFCOMM_SESSION_CLOSED:
case NG_BTSOCKET_RFCOMM_SESSION_DISCONNECTING:
/*
* Do not have to do anything here. We can get here
* when L2CAP connection was terminated or we have
* received DISC on multiplexor channel
*/
break;
case NG_BTSOCKET_RFCOMM_SESSION_OPEN:
/* Send DISC on multiplexor channel */
error = ng_btsocket_rfcomm_send_command(s,
RFCOMM_FRAME_DISC, 0);
if (error == 0) {
s->state = NG_BTSOCKET_RFCOMM_SESSION_DISCONNECTING;
break;
}
/* FALL THROUGH */
case NG_BTSOCKET_RFCOMM_SESSION_CONNECTING:
case NG_BTSOCKET_RFCOMM_SESSION_CONNECTED:
s->state = NG_BTSOCKET_RFCOMM_SESSION_CLOSED;
break;
/* case NG_BTSOCKET_RFCOMM_SESSION_LISTENING: */
default:
panic("%s: Invalid session state=%d, flags=%#x\n",
__func__, s->state, s->flags);
break;
}
ng_btsocket_rfcomm_task_wakeup();
}
return (pcb->so->so_state & SS_NOFDREF);
} /* ng_btsocket_rfcomm_pcb_kill */
/*
* Look for RFCOMM socket with given channel and source address
*/
static ng_btsocket_rfcomm_pcb_p
ng_btsocket_rfcomm_pcb_by_channel(bdaddr_p src, int channel)
{
ng_btsocket_rfcomm_pcb_p pcb = NULL;
mtx_lock(&ng_btsocket_rfcomm_sockets_mtx);
LIST_FOREACH(pcb, &ng_btsocket_rfcomm_sockets, next)
if (pcb->channel == channel &&
bcmp(&pcb->src, src, sizeof(*src)) == 0)
break;
mtx_unlock(&ng_btsocket_rfcomm_sockets_mtx);
return (pcb);
} /* ng_btsocket_rfcomm_pcb_by_channel */
/*
* Look for given dlci for given RFCOMM session. Caller must hold s->session_mtx
*/
static ng_btsocket_rfcomm_pcb_p
ng_btsocket_rfcomm_pcb_by_dlci(ng_btsocket_rfcomm_session_p s, int dlci)
{
ng_btsocket_rfcomm_pcb_p pcb = NULL;
mtx_assert(&s->session_mtx, MA_OWNED);
LIST_FOREACH(pcb, &s->dlcs, session_next)
if (pcb->dlci == dlci)
break;
return (pcb);
} /* ng_btsocket_rfcomm_pcb_by_dlci */
/*
* Look for socket that listens on given src address and given channel
*/
static ng_btsocket_rfcomm_pcb_p
ng_btsocket_rfcomm_pcb_listener(bdaddr_p src, int channel)
{
ng_btsocket_rfcomm_pcb_p pcb = NULL, pcb1 = NULL;
mtx_lock(&ng_btsocket_rfcomm_sockets_mtx);
LIST_FOREACH(pcb, &ng_btsocket_rfcomm_sockets, next) {
if (pcb->channel != channel ||
!(pcb->so->so_options & SO_ACCEPTCONN))
continue;
if (bcmp(&pcb->src, src, sizeof(*src)) == 0)
break;
if (bcmp(&pcb->src, NG_HCI_BDADDR_ANY, sizeof(bdaddr_t)) == 0)
pcb1 = pcb;
}
mtx_unlock(&ng_btsocket_rfcomm_sockets_mtx);
return ((pcb != NULL)? pcb : pcb1);
} /* ng_btsocket_rfcomm_pcb_listener */
/*****************************************************************************
*****************************************************************************
** Misc. functions
*****************************************************************************
*****************************************************************************/
/*
* Set timeout. Caller MUST hold pcb_mtx
*/
static void
ng_btsocket_rfcomm_timeout(ng_btsocket_rfcomm_pcb_p pcb)
{
mtx_assert(&pcb->pcb_mtx, MA_OWNED);
if (!(pcb->flags & NG_BTSOCKET_RFCOMM_DLC_TIMO)) {
pcb->flags |= NG_BTSOCKET_RFCOMM_DLC_TIMO;
pcb->flags &= ~NG_BTSOCKET_RFCOMM_DLC_TIMEDOUT;
pcb->timo = timeout(ng_btsocket_rfcomm_process_timeout, pcb,
ng_btsocket_rfcomm_timo * hz);
} else
panic("%s: Duplicated socket timeout?!\n", __func__);
} /* ng_btsocket_rfcomm_timeout */
/*
* Unset pcb timeout. Caller MUST hold pcb_mtx
*/
static void
ng_btsocket_rfcomm_untimeout(ng_btsocket_rfcomm_pcb_p pcb)
{
mtx_assert(&pcb->pcb_mtx, MA_OWNED);
if (pcb->flags & NG_BTSOCKET_RFCOMM_DLC_TIMO) {
untimeout(ng_btsocket_rfcomm_process_timeout, pcb, pcb->timo);
pcb->flags &= ~NG_BTSOCKET_RFCOMM_DLC_TIMO;
pcb->flags &= ~NG_BTSOCKET_RFCOMM_DLC_TIMEDOUT;
} else
panic("%s: No socket timeout?!\n", __func__);
} /* ng_btsocket_rfcomm_timeout */
/*
* Process pcb timeout
*/
static void
ng_btsocket_rfcomm_process_timeout(void *xpcb)
{
ng_btsocket_rfcomm_pcb_p pcb = (ng_btsocket_rfcomm_pcb_p) xpcb;
mtx_lock(&pcb->pcb_mtx);
NG_BTSOCKET_RFCOMM_INFO(
"%s: Timeout, so=%p, dlci=%d, state=%d, flags=%#x\n",
__func__, pcb->so, pcb->dlci, pcb->state, pcb->flags);
pcb->flags &= ~NG_BTSOCKET_RFCOMM_DLC_TIMO;
pcb->flags |= NG_BTSOCKET_RFCOMM_DLC_TIMEDOUT;
switch (pcb->state) {
case NG_BTSOCKET_RFCOMM_DLC_CONFIGURING:
case NG_BTSOCKET_RFCOMM_DLC_CONNECTING:
pcb->state = NG_BTSOCKET_RFCOMM_DLC_DISCONNECTING;
break;
case NG_BTSOCKET_RFCOMM_DLC_W4_CONNECT:
case NG_BTSOCKET_RFCOMM_DLC_DISCONNECTING:
break;
default:
panic(
"%s: DLC timeout in invalid state, dlci=%d, state=%d, flags=%#x\n",
__func__, pcb->dlci, pcb->state, pcb->flags);
break;
}
ng_btsocket_rfcomm_task_wakeup();
mtx_unlock(&pcb->pcb_mtx);
} /* ng_btsocket_rfcomm_process_timeout */
/*
* Get up to length bytes from the socket buffer
*/
static struct mbuf *
ng_btsocket_rfcomm_prepare_packet(struct sockbuf *sb, int length)
{
struct mbuf *top = NULL, *m = NULL, *n = NULL, *nextpkt = NULL;
int mlen, noff, len;
MGETHDR(top, M_DONTWAIT, MT_DATA);
if (top == NULL)
return (NULL);
top->m_pkthdr.len = length;
top->m_len = 0;
mlen = MHLEN;
m = top;
n = sb->sb_mb;
nextpkt = n->m_nextpkt;
noff = 0;
while (length > 0 && n != NULL) {
len = min(mlen - m->m_len, n->m_len - noff);
if (len > length)
len = length;
bcopy(mtod(n, caddr_t)+noff, mtod(m, caddr_t)+m->m_len, len);
m->m_len += len;
noff += len;
length -= len;
if (length > 0 && m->m_len == mlen) {
MGET(m->m_next, M_DONTWAIT, MT_DATA);
if (m->m_next == NULL) {
NG_FREE_M(top);
return (NULL);
}
m = m->m_next;
m->m_len = 0;
mlen = MLEN;
}
if (noff == n->m_len) {
noff = 0;
n = n->m_next;
if (n == NULL)
n = nextpkt;
nextpkt = (n != NULL)? n->m_nextpkt : NULL;
}
}
if (length < 0)
panic("%s: length=%d\n", __func__, length);
if (length > 0 && n == NULL)
panic("%s: bogus length=%d, n=%p\n", __func__, length, n);
return (top);
} /* ng_btsocket_rfcomm_prepare_packet */
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