/
rfcomm_session.c
1704 lines (1394 loc) · 40.6 KB
/
rfcomm_session.c
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/* $NetBSD: rfcomm_session.c,v 1.23 2014/08/05 07:55:32 rtr Exp $ */
/*-
* Copyright (c) 2006 Itronix Inc.
* All rights reserved.
*
* Written by Iain Hibbert for Itronix Inc.
*
* 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.
* 3. The name of Itronix Inc. may not be used to endorse
* or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY ITRONIX INC. ``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 ITRONIX INC. 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.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: rfcomm_session.c,v 1.23 2014/08/05 07:55:32 rtr Exp $");
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/mbuf.h>
#include <sys/proc.h>
#include <sys/socketvar.h>
#include <sys/systm.h>
#include <sys/types.h>
#include <netbt/bluetooth.h>
#include <netbt/hci.h>
#include <netbt/l2cap.h>
#include <netbt/rfcomm.h>
/******************************************************************************
*
* RFCOMM Multiplexer Sessions sit directly on L2CAP channels, and can
* multiplex up to 30 incoming and 30 outgoing connections.
* Only one Multiplexer is allowed between any two devices.
*/
static void rfcomm_session_timeout(void *);
static void rfcomm_session_recv_sabm(struct rfcomm_session *, int);
static void rfcomm_session_recv_disc(struct rfcomm_session *, int);
static void rfcomm_session_recv_ua(struct rfcomm_session *, int);
static void rfcomm_session_recv_dm(struct rfcomm_session *, int);
static void rfcomm_session_recv_uih(struct rfcomm_session *, int, int, struct mbuf *, int);
static void rfcomm_session_recv_mcc(struct rfcomm_session *, struct mbuf *);
static void rfcomm_session_recv_mcc_test(struct rfcomm_session *, int, struct mbuf *);
static void rfcomm_session_recv_mcc_fcon(struct rfcomm_session *, int);
static void rfcomm_session_recv_mcc_fcoff(struct rfcomm_session *, int);
static void rfcomm_session_recv_mcc_msc(struct rfcomm_session *, int, struct mbuf *);
static void rfcomm_session_recv_mcc_rpn(struct rfcomm_session *, int, struct mbuf *);
static void rfcomm_session_recv_mcc_rls(struct rfcomm_session *, int, struct mbuf *);
static void rfcomm_session_recv_mcc_pn(struct rfcomm_session *, int, struct mbuf *);
static void rfcomm_session_recv_mcc_nsc(struct rfcomm_session *, int, struct mbuf *);
/* L2CAP callbacks */
static void rfcomm_session_connecting(void *);
static void rfcomm_session_connected(void *);
static void rfcomm_session_disconnected(void *, int);
static void *rfcomm_session_newconn(void *, struct sockaddr_bt *, struct sockaddr_bt *);
static void rfcomm_session_complete(void *, int);
static void rfcomm_session_linkmode(void *, int);
static void rfcomm_session_input(void *, struct mbuf *);
static const struct btproto rfcomm_session_proto = {
rfcomm_session_connecting,
rfcomm_session_connected,
rfcomm_session_disconnected,
rfcomm_session_newconn,
rfcomm_session_complete,
rfcomm_session_linkmode,
rfcomm_session_input,
};
struct rfcomm_session_list
rfcomm_session_active = LIST_HEAD_INITIALIZER(rfcomm_session_active);
struct rfcomm_session_list
rfcomm_session_listen = LIST_HEAD_INITIALIZER(rfcomm_session_listen);
static struct pool rfcomm_credit_pool;
/*
* RFCOMM System Parameters (see section 5.3)
*/
int rfcomm_mtu_default = 127; /* bytes */
int rfcomm_ack_timeout = 20; /* seconds */
int rfcomm_mcc_timeout = 20; /* seconds */
/*
* Reversed CRC table as per TS 07.10 Annex B.3.5
*/
static const uint8_t crctable[256] = { /* reversed, 8-bit, poly=0x07 */
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
};
#define FCS(f, d) crctable[(f) ^ (d)]
void
rfcomm_init(void)
{
pool_init(&rfcomm_credit_pool, sizeof(struct rfcomm_credit),
0, 0, 0, "rfcomm_credit", NULL, IPL_SOFTNET);
}
/*
* rfcomm_session_alloc(list, sockaddr)
*
* allocate a new session and fill in the blanks, then
* attach session to front of specified list (active or listen)
*/
struct rfcomm_session *
rfcomm_session_alloc(struct rfcomm_session_list *list,
struct sockaddr_bt *laddr)
{
struct rfcomm_session *rs;
struct sockopt sopt;
int err;
rs = malloc(sizeof(*rs), M_BLUETOOTH, M_NOWAIT | M_ZERO);
if (rs == NULL)
return NULL;
rs->rs_state = RFCOMM_SESSION_CLOSED;
callout_init(&rs->rs_timeout, 0);
callout_setfunc(&rs->rs_timeout, rfcomm_session_timeout, rs);
SIMPLEQ_INIT(&rs->rs_credits);
LIST_INIT(&rs->rs_dlcs);
err = l2cap_attach_pcb(&rs->rs_l2cap, &rfcomm_session_proto, rs);
if (err) {
free(rs, M_BLUETOOTH);
return NULL;
}
sockopt_init(&sopt, BTPROTO_L2CAP, SO_L2CAP_OMTU, 0);
(void)l2cap_getopt(rs->rs_l2cap, &sopt);
(void)sockopt_get(&sopt, &rs->rs_mtu, sizeof(rs->rs_mtu));
sockopt_destroy(&sopt);
if (laddr->bt_psm == L2CAP_PSM_ANY)
laddr->bt_psm = L2CAP_PSM_RFCOMM;
(void)l2cap_bind_pcb(rs->rs_l2cap, laddr);
LIST_INSERT_HEAD(list, rs, rs_next);
return rs;
}
/*
* rfcomm_session_free(rfcomm_session)
*
* release a session, including any cleanup
*/
void
rfcomm_session_free(struct rfcomm_session *rs)
{
struct rfcomm_credit *credit;
KASSERT(rs != NULL);
KASSERT(LIST_EMPTY(&rs->rs_dlcs));
rs->rs_state = RFCOMM_SESSION_CLOSED;
/*
* If the callout is already invoked we have no way to stop it,
* but it will call us back right away (there are no DLC's) so
* not to worry.
*/
callout_stop(&rs->rs_timeout);
if (callout_invoking(&rs->rs_timeout))
return;
/*
* Take care that rfcomm_session_disconnected() doesnt call
* us back either as it will do if the l2cap_channel has not
* been closed when we detach it..
*/
if (rs->rs_flags & RFCOMM_SESSION_FREE)
return;
rs->rs_flags |= RFCOMM_SESSION_FREE;
/* throw away any remaining credit notes */
while ((credit = SIMPLEQ_FIRST(&rs->rs_credits)) != NULL) {
SIMPLEQ_REMOVE_HEAD(&rs->rs_credits, rc_next);
pool_put(&rfcomm_credit_pool, credit);
}
KASSERT(SIMPLEQ_EMPTY(&rs->rs_credits));
/* Goodbye! */
LIST_REMOVE(rs, rs_next);
l2cap_detach_pcb(&rs->rs_l2cap);
callout_destroy(&rs->rs_timeout);
free(rs, M_BLUETOOTH);
}
/*
* rfcomm_session_lookup(sockaddr, sockaddr)
*
* Find active rfcomm session matching src and dest addresses
* when src is BDADDR_ANY match any local address
*/
struct rfcomm_session *
rfcomm_session_lookup(struct sockaddr_bt *src, struct sockaddr_bt *dest)
{
struct rfcomm_session *rs;
struct sockaddr_bt addr;
LIST_FOREACH(rs, &rfcomm_session_active, rs_next) {
if (rs->rs_state == RFCOMM_SESSION_CLOSED)
continue;
l2cap_sockaddr_pcb(rs->rs_l2cap, &addr);
if (bdaddr_same(&src->bt_bdaddr, &addr.bt_bdaddr) == 0)
if (bdaddr_any(&src->bt_bdaddr) == 0)
continue;
l2cap_peeraddr_pcb(rs->rs_l2cap, &addr);
if (addr.bt_psm != dest->bt_psm)
continue;
if (bdaddr_same(&dest->bt_bdaddr, &addr.bt_bdaddr))
break;
}
return rs;
}
/*
* rfcomm_session_timeout(rfcomm_session)
*
* Session timeouts are scheduled when a session is left or
* created with no DLCs, and when SABM(0) or DISC(0) are
* sent.
*
* So, if it is in an open state with DLC's attached then
* we leave it alone, otherwise the session is lost.
*/
static void
rfcomm_session_timeout(void *arg)
{
struct rfcomm_session *rs = arg;
struct rfcomm_dlc *dlc;
KASSERT(rs != NULL);
mutex_enter(bt_lock);
callout_ack(&rs->rs_timeout);
if (rs->rs_state != RFCOMM_SESSION_OPEN) {
DPRINTF("timeout\n");
rs->rs_state = RFCOMM_SESSION_CLOSED;
while (!LIST_EMPTY(&rs->rs_dlcs)) {
dlc = LIST_FIRST(&rs->rs_dlcs);
rfcomm_dlc_close(dlc, ETIMEDOUT);
}
}
if (LIST_EMPTY(&rs->rs_dlcs)) {
DPRINTF("expiring\n");
rfcomm_session_free(rs);
}
mutex_exit(bt_lock);
}
/***********************************************************************
*
* RFCOMM Session L2CAP protocol callbacks
*
*/
static void
rfcomm_session_connecting(void *arg)
{
/* struct rfcomm_session *rs = arg; */
DPRINTF("Connecting\n");
}
static void
rfcomm_session_connected(void *arg)
{
struct rfcomm_session *rs = arg;
struct sockopt sopt;
DPRINTF("Connected\n");
/*
* L2CAP is open.
*
* If we are initiator, we can send our SABM(0)
* a timeout should be active?
*
* We must take note of the L2CAP MTU because currently
* the L2CAP implementation can only do Basic Mode.
*/
sockopt_init(&sopt, BTPROTO_L2CAP, SO_L2CAP_OMTU, 0);
(void)l2cap_getopt(rs->rs_l2cap, &sopt);
(void)sockopt_get(&sopt, &rs->rs_mtu, sizeof(rs->rs_mtu));
sockopt_destroy(&sopt);
rs->rs_mtu -= 6; /* (RFCOMM overhead could be this big) */
if (rs->rs_mtu < RFCOMM_MTU_MIN) {
rfcomm_session_disconnected(rs, EINVAL);
return;
}
if (IS_INITIATOR(rs)) {
int err;
err = rfcomm_session_send_frame(rs, RFCOMM_FRAME_SABM, 0);
if (err)
rfcomm_session_disconnected(rs, err);
callout_schedule(&rs->rs_timeout, rfcomm_ack_timeout * hz);
}
}
static void
rfcomm_session_disconnected(void *arg, int err)
{
struct rfcomm_session *rs = arg;
struct rfcomm_dlc *dlc;
DPRINTF("Disconnected\n");
/*
* If we have any DLCs outstanding in the unlikely case that the
* L2CAP channel disconnected normally, close them with an error
*/
if (err == 0)
err = ECONNRESET;
rs->rs_state = RFCOMM_SESSION_CLOSED;
while (!LIST_EMPTY(&rs->rs_dlcs)) {
dlc = LIST_FIRST(&rs->rs_dlcs);
rfcomm_dlc_close(dlc, err);
}
rfcomm_session_free(rs);
}
static void *
rfcomm_session_newconn(void *arg, struct sockaddr_bt *laddr,
struct sockaddr_bt *raddr)
{
struct rfcomm_session *new, *rs = arg;
DPRINTF("New Connection\n");
/*
* Incoming session connect request. We should return a new
* session pointer if this is acceptable. The L2CAP layer
* passes local and remote addresses, which we must check as
* only one RFCOMM session is allowed between any two devices
*/
new = rfcomm_session_lookup(laddr, raddr);
if (new != NULL)
return NULL;
new = rfcomm_session_alloc(&rfcomm_session_active, laddr);
if (new == NULL)
return NULL;
new->rs_mtu = rs->rs_mtu;
new->rs_state = RFCOMM_SESSION_WAIT_CONNECT;
/*
* schedule an expiry so that if nothing comes of it we
* can punt.
*/
callout_schedule(&new->rs_timeout, rfcomm_mcc_timeout * hz);
return new->rs_l2cap;
}
static void
rfcomm_session_complete(void *arg, int count)
{
struct rfcomm_session *rs = arg;
struct rfcomm_credit *credit;
struct rfcomm_dlc *dlc;
/*
* count L2CAP packets are 'complete', meaning that they are cleared
* our buffers (for best effort) or arrived safe (for guaranteed) so
* we can take it off our list and pass the message on, so that
* eventually the data can be removed from the sockbuf
*/
while (count-- > 0) {
credit = SIMPLEQ_FIRST(&rs->rs_credits);
if (credit == NULL) {
printf("%s: too many packets completed!\n", __func__);
break;
}
dlc = credit->rc_dlc;
if (dlc != NULL) {
dlc->rd_pending--;
(*dlc->rd_proto->complete)
(dlc->rd_upper, credit->rc_len);
/*
* if not using credit flow control, we may push
* more data now
*/
if ((rs->rs_flags & RFCOMM_SESSION_CFC) == 0
&& dlc->rd_state == RFCOMM_DLC_OPEN) {
rfcomm_dlc_start(dlc);
}
/*
* When shutdown is indicated, we are just waiting to
* clear outgoing data.
*/
if ((dlc->rd_flags & RFCOMM_DLC_SHUTDOWN)
&& dlc->rd_txbuf == NULL && dlc->rd_pending == 0) {
dlc->rd_state = RFCOMM_DLC_WAIT_DISCONNECT;
rfcomm_session_send_frame(rs, RFCOMM_FRAME_DISC,
dlc->rd_dlci);
callout_schedule(&dlc->rd_timeout,
rfcomm_ack_timeout * hz);
}
}
SIMPLEQ_REMOVE_HEAD(&rs->rs_credits, rc_next);
pool_put(&rfcomm_credit_pool, credit);
}
/*
* If session is closed, we are just waiting to clear the queue
*/
if (rs->rs_state == RFCOMM_SESSION_CLOSED) {
if (SIMPLEQ_EMPTY(&rs->rs_credits))
l2cap_disconnect_pcb(rs->rs_l2cap, 0);
}
}
/*
* Link Mode changed
*
* This is called when a mode change is complete. Proceed with connections
* where appropriate, or pass the new mode to any active DLCs.
*/
static void
rfcomm_session_linkmode(void *arg, int new)
{
struct rfcomm_session *rs = arg;
struct rfcomm_dlc *dlc, *next;
int err, mode = 0;
DPRINTF("auth %s, encrypt %s, secure %s\n",
(new & L2CAP_LM_AUTH ? "on" : "off"),
(new & L2CAP_LM_ENCRYPT ? "on" : "off"),
(new & L2CAP_LM_SECURE ? "on" : "off"));
if (new & L2CAP_LM_AUTH)
mode |= RFCOMM_LM_AUTH;
if (new & L2CAP_LM_ENCRYPT)
mode |= RFCOMM_LM_ENCRYPT;
if (new & L2CAP_LM_SECURE)
mode |= RFCOMM_LM_SECURE;
next = LIST_FIRST(&rs->rs_dlcs);
while ((dlc = next) != NULL) {
next = LIST_NEXT(dlc, rd_next);
switch (dlc->rd_state) {
case RFCOMM_DLC_WAIT_SEND_SABM: /* we are connecting */
if ((mode & dlc->rd_mode) != dlc->rd_mode) {
rfcomm_dlc_close(dlc, ECONNABORTED);
} else {
err = rfcomm_session_send_frame(rs,
RFCOMM_FRAME_SABM, dlc->rd_dlci);
if (err) {
rfcomm_dlc_close(dlc, err);
} else {
dlc->rd_state = RFCOMM_DLC_WAIT_RECV_UA;
callout_schedule(&dlc->rd_timeout,
rfcomm_ack_timeout * hz);
break;
}
}
/*
* If we aborted the connection and there are no more DLCs
* on the session, it is our responsibility to disconnect.
*/
if (!LIST_EMPTY(&rs->rs_dlcs))
break;
rs->rs_state = RFCOMM_SESSION_WAIT_DISCONNECT;
rfcomm_session_send_frame(rs, RFCOMM_FRAME_DISC, 0);
callout_schedule(&rs->rs_timeout, rfcomm_ack_timeout * hz);
break;
case RFCOMM_DLC_WAIT_SEND_UA: /* they are connecting */
if ((mode & dlc->rd_mode) != dlc->rd_mode) {
rfcomm_session_send_frame(rs,
RFCOMM_FRAME_DM, dlc->rd_dlci);
rfcomm_dlc_close(dlc, ECONNABORTED);
break;
}
err = rfcomm_session_send_frame(rs,
RFCOMM_FRAME_UA, dlc->rd_dlci);
if (err) {
rfcomm_session_send_frame(rs,
RFCOMM_FRAME_DM, dlc->rd_dlci);
rfcomm_dlc_close(dlc, err);
break;
}
err = rfcomm_dlc_open(dlc);
if (err) {
rfcomm_session_send_frame(rs,
RFCOMM_FRAME_DM, dlc->rd_dlci);
rfcomm_dlc_close(dlc, err);
break;
}
break;
case RFCOMM_DLC_WAIT_RECV_UA:
case RFCOMM_DLC_OPEN: /* already established */
(*dlc->rd_proto->linkmode)(dlc->rd_upper, mode);
break;
default:
break;
}
}
}
/*
* Receive data from L2CAP layer for session. There is always exactly one
* RFCOMM frame contained in each L2CAP frame.
*/
static void
rfcomm_session_input(void *arg, struct mbuf *m)
{
struct rfcomm_session *rs = arg;
int dlci, len, type, pf;
uint8_t fcs, b;
KASSERT(m != NULL);
KASSERT(rs != NULL);
/*
* UIH frames: FCS is only calculated on address and control fields
* For other frames: FCS is calculated on address, control and length
* Length may extend to two octets
*/
fcs = 0xff;
if (m->m_pkthdr.len < 4) {
DPRINTF("short frame (%d), discarded\n", m->m_pkthdr.len);
goto done;
}
/* address - one octet */
m_copydata(m, 0, 1, &b);
m_adj(m, 1);
fcs = FCS(fcs, b);
dlci = RFCOMM_DLCI(b);
/* control - one octet */
m_copydata(m, 0, 1, &b);
m_adj(m, 1);
fcs = FCS(fcs, b);
type = RFCOMM_TYPE(b);
pf = RFCOMM_PF(b);
/* length - may be two octets */
m_copydata(m, 0, 1, &b);
m_adj(m, 1);
if (type != RFCOMM_FRAME_UIH)
fcs = FCS(fcs, b);
len = (b >> 1) & 0x7f;
if (RFCOMM_EA(b) == 0) {
if (m->m_pkthdr.len < 2) {
DPRINTF("short frame (%d, EA = 0), discarded\n",
m->m_pkthdr.len);
goto done;
}
m_copydata(m, 0, 1, &b);
m_adj(m, 1);
if (type != RFCOMM_FRAME_UIH)
fcs = FCS(fcs, b);
len |= (b << 7);
}
/* FCS byte is last octet in frame */
m_copydata(m, m->m_pkthdr.len - 1, 1, &b);
m_adj(m, -1);
fcs = FCS(fcs, b);
if (fcs != 0xcf) {
DPRINTF("Bad FCS value (%#2.2x), frame discarded\n", fcs);
goto done;
}
DPRINTFN(10, "dlci %d, type %2.2x, len = %d\n", dlci, type, len);
switch (type) {
case RFCOMM_FRAME_SABM:
if (pf)
rfcomm_session_recv_sabm(rs, dlci);
break;
case RFCOMM_FRAME_DISC:
if (pf)
rfcomm_session_recv_disc(rs, dlci);
break;
case RFCOMM_FRAME_UA:
if (pf)
rfcomm_session_recv_ua(rs, dlci);
break;
case RFCOMM_FRAME_DM:
rfcomm_session_recv_dm(rs, dlci);
break;
case RFCOMM_FRAME_UIH:
rfcomm_session_recv_uih(rs, dlci, pf, m, len);
return; /* (no release) */
default:
UNKNOWN(type);
break;
}
done:
m_freem(m);
}
/***********************************************************************
*
* RFCOMM Session receive processing
*/
/*
* rfcomm_session_recv_sabm(rfcomm_session, dlci)
*
* Set Asyncrhonous Balanced Mode - open the channel.
*/
static void
rfcomm_session_recv_sabm(struct rfcomm_session *rs, int dlci)
{
struct rfcomm_dlc *dlc;
int err;
DPRINTFN(5, "SABM(%d)\n", dlci);
if (dlci == 0) { /* Open Session */
rs->rs_state = RFCOMM_SESSION_OPEN;
rfcomm_session_send_frame(rs, RFCOMM_FRAME_UA, 0);
LIST_FOREACH(dlc, &rs->rs_dlcs, rd_next) {
if (dlc->rd_state == RFCOMM_DLC_WAIT_SESSION)
rfcomm_dlc_connect(dlc);
}
return;
}
if (rs->rs_state != RFCOMM_SESSION_OPEN) {
DPRINTF("session was not even open!\n");
return;
}
/* validate direction bit */
if ((IS_INITIATOR(rs) && !RFCOMM_DIRECTION(dlci))
|| (!IS_INITIATOR(rs) && RFCOMM_DIRECTION(dlci))) {
DPRINTF("Invalid direction bit on DLCI\n");
return;
}
/*
* look for our DLC - this may exist if we received PN
* already, or we may have to fabricate a new one.
*/
dlc = rfcomm_dlc_lookup(rs, dlci);
if (dlc == NULL) {
dlc = rfcomm_dlc_newconn(rs, dlci);
if (dlc == NULL)
return; /* (DM is sent) */
}
/*
* ..but if this DLC is not waiting to connect, they did
* something wrong, ignore it.
*/
if (dlc->rd_state != RFCOMM_DLC_WAIT_CONNECT)
return;
/* set link mode */
err = rfcomm_dlc_setmode(dlc);
if (err == EINPROGRESS) {
dlc->rd_state = RFCOMM_DLC_WAIT_SEND_UA;
(*dlc->rd_proto->connecting)(dlc->rd_upper);
return;
}
if (err)
goto close;
err = rfcomm_session_send_frame(rs, RFCOMM_FRAME_UA, dlci);
if (err)
goto close;
/* and mark it open */
err = rfcomm_dlc_open(dlc);
if (err)
goto close;
return;
close:
rfcomm_dlc_close(dlc, err);
}
/*
* Receive Disconnect Command
*/
static void
rfcomm_session_recv_disc(struct rfcomm_session *rs, int dlci)
{
struct rfcomm_dlc *dlc;
DPRINTFN(5, "DISC(%d)\n", dlci);
if (dlci == 0) {
/*
* Disconnect Session
*
* We set the session state to CLOSED so that when
* the UA frame is clear the session will be closed
* automatically. We wont bother to close any DLC's
* just yet as there should be none. In the unlikely
* event that something is left, it will get flushed
* out as the session goes down.
*/
rfcomm_session_send_frame(rs, RFCOMM_FRAME_UA, 0);
rs->rs_state = RFCOMM_SESSION_CLOSED;
return;
}
dlc = rfcomm_dlc_lookup(rs, dlci);
if (dlc == NULL) {
rfcomm_session_send_frame(rs, RFCOMM_FRAME_DM, dlci);
return;
}
rfcomm_dlc_close(dlc, 0);
rfcomm_session_send_frame(rs, RFCOMM_FRAME_UA, dlci);
}
/*
* Receive Unnumbered Acknowledgement Response
*
* This should be a response to a DISC or SABM frame that we
* have previously sent. If unexpected, ignore it.
*/
static void
rfcomm_session_recv_ua(struct rfcomm_session *rs, int dlci)
{
struct rfcomm_dlc *dlc;
DPRINTFN(5, "UA(%d)\n", dlci);
if (dlci == 0) {
switch (rs->rs_state) {
case RFCOMM_SESSION_WAIT_CONNECT: /* We sent SABM */
callout_stop(&rs->rs_timeout);
rs->rs_state = RFCOMM_SESSION_OPEN;
LIST_FOREACH(dlc, &rs->rs_dlcs, rd_next) {
if (dlc->rd_state == RFCOMM_DLC_WAIT_SESSION)
rfcomm_dlc_connect(dlc);
}
break;
case RFCOMM_SESSION_WAIT_DISCONNECT: /* We sent DISC */
callout_stop(&rs->rs_timeout);
rs->rs_state = RFCOMM_SESSION_CLOSED;
l2cap_disconnect_pcb(rs->rs_l2cap, 0);
break;
default:
DPRINTF("Received spurious UA(0)!\n");
break;
}
return;
}
/*
* If we have no DLC on this dlci, we may have aborted
* without shutting down properly, so check if the session
* needs disconnecting.
*/
dlc = rfcomm_dlc_lookup(rs, dlci);
if (dlc == NULL)
goto check;
switch (dlc->rd_state) {
case RFCOMM_DLC_WAIT_RECV_UA: /* We sent SABM */
rfcomm_dlc_open(dlc);
return;
case RFCOMM_DLC_WAIT_DISCONNECT: /* We sent DISC */
rfcomm_dlc_close(dlc, 0);
break;
default:
DPRINTF("Received spurious UA(%d)!\n", dlci);
return;
}
check: /* last one out turns out the light */
if (LIST_EMPTY(&rs->rs_dlcs)) {
rs->rs_state = RFCOMM_SESSION_WAIT_DISCONNECT;
rfcomm_session_send_frame(rs, RFCOMM_FRAME_DISC, 0);
callout_schedule(&rs->rs_timeout, rfcomm_ack_timeout * hz);
}
}
/*
* Receive Disconnected Mode Response
*
* If this does not apply to a known DLC then we may ignore it.
*/
static void
rfcomm_session_recv_dm(struct rfcomm_session *rs, int dlci)
{
struct rfcomm_dlc *dlc;
DPRINTFN(5, "DM(%d)\n", dlci);
dlc = rfcomm_dlc_lookup(rs, dlci);
if (dlc == NULL)
return;
if (dlc->rd_state == RFCOMM_DLC_WAIT_CONNECT)
rfcomm_dlc_close(dlc, ECONNREFUSED);
else
rfcomm_dlc_close(dlc, ECONNRESET);
}
/*
* Receive Unnumbered Information with Header check (MCC or data packet)
*/
static void
rfcomm_session_recv_uih(struct rfcomm_session *rs, int dlci,
int pf, struct mbuf *m, int len)
{
struct rfcomm_dlc *dlc;
uint8_t credits = 0;
DPRINTFN(10, "UIH(%d)\n", dlci);
if (dlci == 0) {
rfcomm_session_recv_mcc(rs, m);
return;
}
if (m->m_pkthdr.len != len + pf) {
DPRINTF("Bad Frame Length (%d), frame discarded\n",
m->m_pkthdr.len);
goto discard;
}
dlc = rfcomm_dlc_lookup(rs, dlci);
if (dlc == NULL) {
DPRINTF("UIH received for non existent DLC, discarded\n");
rfcomm_session_send_frame(rs, RFCOMM_FRAME_DM, dlci);
goto discard;
}
if (dlc->rd_state != RFCOMM_DLC_OPEN) {
DPRINTF("non-open DLC (state = %d), discarded\n",
dlc->rd_state);
goto discard;
}
/* if PF is set, credits were included */
if (rs->rs_flags & RFCOMM_SESSION_CFC) {
if (pf != 0) {
if (m->m_pkthdr.len < sizeof(credits)) {
DPRINTF("Bad PF value, UIH discarded\n");
goto discard;
}
m_copydata(m, 0, sizeof(credits), &credits);
m_adj(m, sizeof(credits));
dlc->rd_txcred += credits;
if (credits > 0 && dlc->rd_txbuf != NULL)
rfcomm_dlc_start(dlc);
}
if (len == 0)
goto discard;
if (dlc->rd_rxcred == 0) {
DPRINTF("Credit limit reached, UIH discarded\n");
goto discard;
}
if (len > dlc->rd_rxsize) {
DPRINTF("UIH frame exceeds rxsize, discarded\n");
goto discard;
}
dlc->rd_rxcred--;
dlc->rd_rxsize -= len;
}
(*dlc->rd_proto->input)(dlc->rd_upper, m);
return;
discard:
m_freem(m);
}
/*
* Receive Multiplexer Control Command
*/