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/*
* ng_l2cap_misc.c
*/
/*-
* Copyright (c) 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_l2cap_misc.c,v 1.5 2003/09/08 19:11:45 max Exp $
* $FreeBSD: release/9.1.0/sys/netgraph/bluetooth/l2cap/ng_l2cap_misc.c 184205 2008-10-23 15:53:51Z des $
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/queue.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/l2cap/ng_l2cap_var.h>
#include <netgraph/bluetooth/l2cap/ng_l2cap_cmds.h>
#include <netgraph/bluetooth/l2cap/ng_l2cap_evnt.h>
#include <netgraph/bluetooth/l2cap/ng_l2cap_llpi.h>
#include <netgraph/bluetooth/l2cap/ng_l2cap_ulpi.h>
#include <netgraph/bluetooth/l2cap/ng_l2cap_misc.h>
static u_int16_t ng_l2cap_get_cid (ng_l2cap_p);
/******************************************************************************
******************************************************************************
** Utility routines
******************************************************************************
******************************************************************************/
/*
* Send hook information to the upper layer
*/
void
ng_l2cap_send_hook_info(node_p node, hook_p hook, void *arg1, int arg2)
{
ng_l2cap_p l2cap = NULL;
struct ng_mesg *msg = NULL;
int error = 0;
if (node == NULL || NG_NODE_NOT_VALID(node) ||
hook == NULL || NG_HOOK_NOT_VALID(hook))
return;
l2cap = (ng_l2cap_p) NG_NODE_PRIVATE(node);
if (l2cap->hci == NULL || NG_HOOK_NOT_VALID(l2cap->hci) ||
bcmp(&l2cap->bdaddr, NG_HCI_BDADDR_ANY, sizeof(l2cap->bdaddr)) == 0)
return;
NG_MKMESSAGE(msg, NGM_L2CAP_COOKIE, NGM_L2CAP_NODE_HOOK_INFO,
sizeof(bdaddr_t), M_NOWAIT);
if (msg != NULL) {
bcopy(&l2cap->bdaddr, msg->data, sizeof(bdaddr_t));
NG_SEND_MSG_HOOK(error, node, msg, hook, 0);
} else
error = ENOMEM;
if (error != 0)
NG_L2CAP_INFO(
"%s: %s - failed to send HOOK_INFO message to hook \"%s\", error=%d\n",
__func__, NG_NODE_NAME(l2cap->node), NG_HOOK_NAME(hook),
error);
} /* ng_l2cap_send_hook_info */
/*
* Create new connection descriptor for the "remote" unit.
* Will link connection descriptor to the l2cap node.
*/
ng_l2cap_con_p
ng_l2cap_new_con(ng_l2cap_p l2cap, bdaddr_p bdaddr)
{
static int fake_con_handle = 0x0f00;
ng_l2cap_con_p con = NULL;
/* Create new connection descriptor */
con = malloc(sizeof(*con), M_NETGRAPH_L2CAP,
M_NOWAIT|M_ZERO);
if (con == NULL)
return (NULL);
con->l2cap = l2cap;
con->state = NG_L2CAP_CON_CLOSED;
/*
* XXX
*
* Assign fake connection handle to the connection descriptor.
* Bluetooth specification marks 0x0f00 - 0x0fff connection
* handles as reserved. We need this fake connection handles
* for timeouts. Connection handle will be passed as argument
* to timeout so when timeout happens we can find the right
* connection descriptor. We can not pass pointers, because
* timeouts are external (to Netgraph) events and there might
* be a race when node/hook goes down and timeout event already
* went into node's queue
*/
con->con_handle = fake_con_handle ++;
if (fake_con_handle > 0x0fff)
fake_con_handle = 0x0f00;
bcopy(bdaddr, &con->remote, sizeof(con->remote));
ng_callout_init(&con->con_timo);
con->ident = NG_L2CAP_FIRST_IDENT - 1;
TAILQ_INIT(&con->cmd_list);
/* Link connection */
LIST_INSERT_HEAD(&l2cap->con_list, con, next);
return (con);
} /* ng_l2cap_new_con */
/*
* Add reference to the connection descriptor
*/
void
ng_l2cap_con_ref(ng_l2cap_con_p con)
{
con->refcnt ++;
if (con->flags & NG_L2CAP_CON_AUTO_DISCON_TIMO) {
if ((con->state != NG_L2CAP_CON_OPEN) ||
(con->flags & NG_L2CAP_CON_OUTGOING) == 0)
panic(
"%s: %s - bad auto disconnect timeout, state=%d, flags=%#x\n",
__func__, NG_NODE_NAME(con->l2cap->node),
con->state, con->flags);
ng_l2cap_discon_untimeout(con);
}
} /* ng_l2cap_con_ref */
/*
* Remove reference from the connection descriptor
*/
void
ng_l2cap_con_unref(ng_l2cap_con_p con)
{
con->refcnt --;
if (con->refcnt < 0)
panic(
"%s: %s - con->refcnt < 0\n", __func__, NG_NODE_NAME(con->l2cap->node));
/*
* Set auto disconnect timer only if the following conditions are met:
* 1) we have no reference on the connection
* 2) connection is in OPEN state
* 3) it is an outgoing connection
* 4) disconnect timeout > 0
* 5) connection is not dying
*/
if ((con->refcnt == 0) &&
(con->state == NG_L2CAP_CON_OPEN) &&
(con->flags & NG_L2CAP_CON_OUTGOING) &&
(con->l2cap->discon_timo > 0) &&
((con->flags & NG_L2CAP_CON_DYING) == 0))
ng_l2cap_discon_timeout(con);
} /* ng_l2cap_con_unref */
/*
* Set auto disconnect timeout
* XXX FIXME: check return code from ng_callout
*/
int
ng_l2cap_discon_timeout(ng_l2cap_con_p con)
{
if (con->flags & (NG_L2CAP_CON_LP_TIMO|NG_L2CAP_CON_AUTO_DISCON_TIMO))
panic(
"%s: %s - invalid timeout, state=%d, flags=%#x\n",
__func__, NG_NODE_NAME(con->l2cap->node),
con->state, con->flags);
con->flags |= NG_L2CAP_CON_AUTO_DISCON_TIMO;
ng_callout(&con->con_timo, con->l2cap->node, NULL,
con->l2cap->discon_timo * hz,
ng_l2cap_process_discon_timeout, NULL,
con->con_handle);
return (0);
} /* ng_l2cap_discon_timeout */
/*
* Unset auto disconnect timeout
*/
int
ng_l2cap_discon_untimeout(ng_l2cap_con_p con)
{
if (!(con->flags & NG_L2CAP_CON_AUTO_DISCON_TIMO))
panic(
"%s: %s - no disconnect timeout, state=%d, flags=%#x\n",
__func__, NG_NODE_NAME(con->l2cap->node),
con->state, con->flags);
if (ng_uncallout(&con->con_timo, con->l2cap->node) == 0)
return (ETIMEDOUT);
con->flags &= ~NG_L2CAP_CON_AUTO_DISCON_TIMO;
return (0);
} /* ng_l2cap_discon_untimeout */
/*
* Free connection descriptor. Will unlink connection and free everything.
*/
void
ng_l2cap_free_con(ng_l2cap_con_p con)
{
ng_l2cap_chan_p f = NULL, n = NULL;
con->state = NG_L2CAP_CON_CLOSED;
while (con->tx_pkt != NULL) {
struct mbuf *m = con->tx_pkt->m_nextpkt;
m_freem(con->tx_pkt);
con->tx_pkt = m;
}
NG_FREE_M(con->rx_pkt);
for (f = LIST_FIRST(&con->l2cap->chan_list); f != NULL; ) {
n = LIST_NEXT(f, next);
if (f->con == con)
ng_l2cap_free_chan(f);
f = n;
}
while (!TAILQ_EMPTY(&con->cmd_list)) {
ng_l2cap_cmd_p cmd = TAILQ_FIRST(&con->cmd_list);
ng_l2cap_unlink_cmd(cmd);
if (cmd->flags & NG_L2CAP_CMD_PENDING)
ng_l2cap_command_untimeout(cmd);
ng_l2cap_free_cmd(cmd);
}
if (con->flags & (NG_L2CAP_CON_AUTO_DISCON_TIMO|NG_L2CAP_CON_LP_TIMO))
panic(
"%s: %s - timeout pending! state=%d, flags=%#x\n",
__func__, NG_NODE_NAME(con->l2cap->node),
con->state, con->flags);
LIST_REMOVE(con, next);
bzero(con, sizeof(*con));
free(con, M_NETGRAPH_L2CAP);
} /* ng_l2cap_free_con */
/*
* Get connection by "remote" address
*/
ng_l2cap_con_p
ng_l2cap_con_by_addr(ng_l2cap_p l2cap, bdaddr_p bdaddr)
{
ng_l2cap_con_p con = NULL;
LIST_FOREACH(con, &l2cap->con_list, next)
if (bcmp(bdaddr, &con->remote, sizeof(con->remote)) == 0)
break;
return (con);
} /* ng_l2cap_con_by_addr */
/*
* Get connection by "handle"
*/
ng_l2cap_con_p
ng_l2cap_con_by_handle(ng_l2cap_p l2cap, u_int16_t con_handle)
{
ng_l2cap_con_p con = NULL;
LIST_FOREACH(con, &l2cap->con_list, next)
if (con->con_handle == con_handle)
break;
return (con);
} /* ng_l2cap_con_by_handle */
/*
* Allocate new L2CAP channel descriptor on "con" conection with "psm".
* Will link the channel to the l2cap node
*/
ng_l2cap_chan_p
ng_l2cap_new_chan(ng_l2cap_p l2cap, ng_l2cap_con_p con, u_int16_t psm)
{
ng_l2cap_chan_p ch = NULL;
ch = malloc(sizeof(*ch), M_NETGRAPH_L2CAP,
M_NOWAIT|M_ZERO);
if (ch == NULL)
return (NULL);
ch->scid = ng_l2cap_get_cid(l2cap);
if (ch->scid != NG_L2CAP_NULL_CID) {
/* Initialize channel */
ch->psm = psm;
ch->con = con;
ch->state = NG_L2CAP_CLOSED;
/* Set MTU and flow control settings to defaults */
ch->imtu = NG_L2CAP_MTU_DEFAULT;
bcopy(ng_l2cap_default_flow(), &ch->iflow, sizeof(ch->iflow));
ch->omtu = NG_L2CAP_MTU_DEFAULT;
bcopy(ng_l2cap_default_flow(), &ch->oflow, sizeof(ch->oflow));
ch->flush_timo = NG_L2CAP_FLUSH_TIMO_DEFAULT;
ch->link_timo = NG_L2CAP_LINK_TIMO_DEFAULT;
LIST_INSERT_HEAD(&l2cap->chan_list, ch, next);
ng_l2cap_con_ref(con);
} else {
bzero(ch, sizeof(*ch));
free(ch, M_NETGRAPH_L2CAP);
ch = NULL;
}
return (ch);
} /* ng_l2cap_new_chan */
/*
* Get channel by source (local) channel ID
*/
ng_l2cap_chan_p
ng_l2cap_chan_by_scid(ng_l2cap_p l2cap, u_int16_t scid)
{
ng_l2cap_chan_p ch = NULL;
LIST_FOREACH(ch, &l2cap->chan_list, next)
if (ch->scid == scid)
break;
return (ch);
} /* ng_l2cap_chan_by_scid */
/*
* Free channel descriptor.
*/
void
ng_l2cap_free_chan(ng_l2cap_chan_p ch)
{
ng_l2cap_cmd_p f = NULL, n = NULL;
f = TAILQ_FIRST(&ch->con->cmd_list);
while (f != NULL) {
n = TAILQ_NEXT(f, next);
if (f->ch == ch) {
ng_l2cap_unlink_cmd(f);
if (f->flags & NG_L2CAP_CMD_PENDING)
ng_l2cap_command_untimeout(f);
ng_l2cap_free_cmd(f);
}
f = n;
}
LIST_REMOVE(ch, next);
ng_l2cap_con_unref(ch->con);
bzero(ch, sizeof(*ch));
free(ch, M_NETGRAPH_L2CAP);
} /* ng_l2cap_free_chan */
/*
* Create new L2CAP command descriptor. WILL NOT add command to the queue.
*/
ng_l2cap_cmd_p
ng_l2cap_new_cmd(ng_l2cap_con_p con, ng_l2cap_chan_p ch, u_int8_t ident,
u_int8_t code, u_int32_t token)
{
ng_l2cap_cmd_p cmd = NULL;
KASSERT((ch == NULL || ch->con == con),
("%s: %s - invalid channel pointer!\n",
__func__, NG_NODE_NAME(con->l2cap->node)));
cmd = malloc(sizeof(*cmd), M_NETGRAPH_L2CAP,
M_NOWAIT|M_ZERO);
if (cmd == NULL)
return (NULL);
cmd->con = con;
cmd->ch = ch;
cmd->ident = ident;
cmd->code = code;
cmd->token = token;
ng_callout_init(&cmd->timo);
return (cmd);
} /* ng_l2cap_new_cmd */
/*
* Get pending (i.e. initiated by local side) L2CAP command descriptor by ident
*/
ng_l2cap_cmd_p
ng_l2cap_cmd_by_ident(ng_l2cap_con_p con, u_int8_t ident)
{
ng_l2cap_cmd_p cmd = NULL;
TAILQ_FOREACH(cmd, &con->cmd_list, next) {
if ((cmd->flags & NG_L2CAP_CMD_PENDING) && cmd->ident == ident) {
KASSERT((cmd->con == con),
("%s: %s - invalid connection pointer!\n",
__func__, NG_NODE_NAME(con->l2cap->node)));
break;
}
}
return (cmd);
} /* ng_l2cap_cmd_by_ident */
/*
* Set LP timeout
* XXX FIXME: check return code from ng_callout
*/
int
ng_l2cap_lp_timeout(ng_l2cap_con_p con)
{
if (con->flags & (NG_L2CAP_CON_LP_TIMO|NG_L2CAP_CON_AUTO_DISCON_TIMO))
panic(
"%s: %s - invalid timeout, state=%d, flags=%#x\n",
__func__, NG_NODE_NAME(con->l2cap->node),
con->state, con->flags);
con->flags |= NG_L2CAP_CON_LP_TIMO;
ng_callout(&con->con_timo, con->l2cap->node, NULL,
bluetooth_hci_connect_timeout(),
ng_l2cap_process_lp_timeout, NULL,
con->con_handle);
return (0);
} /* ng_l2cap_lp_timeout */
/*
* Unset LP timeout
*/
int
ng_l2cap_lp_untimeout(ng_l2cap_con_p con)
{
if (!(con->flags & NG_L2CAP_CON_LP_TIMO))
panic(
"%s: %s - no LP connection timeout, state=%d, flags=%#x\n",
__func__, NG_NODE_NAME(con->l2cap->node),
con->state, con->flags);
if (ng_uncallout(&con->con_timo, con->l2cap->node) == 0)
return (ETIMEDOUT);
con->flags &= ~NG_L2CAP_CON_LP_TIMO;
return (0);
} /* ng_l2cap_lp_untimeout */
/*
* Set L2CAP command timeout
* XXX FIXME: check return code from ng_callout
*/
int
ng_l2cap_command_timeout(ng_l2cap_cmd_p cmd, int timo)
{
int arg;
if (cmd->flags & NG_L2CAP_CMD_PENDING)
panic(
"%s: %s - duplicated command timeout, code=%#x, flags=%#x\n",
__func__, NG_NODE_NAME(cmd->con->l2cap->node),
cmd->code, cmd->flags);
arg = ((cmd->ident << 16) | cmd->con->con_handle);
cmd->flags |= NG_L2CAP_CMD_PENDING;
ng_callout(&cmd->timo, cmd->con->l2cap->node, NULL, timo,
ng_l2cap_process_command_timeout, NULL, arg);
return (0);
} /* ng_l2cap_command_timeout */
/*
* Unset L2CAP command timeout
*/
int
ng_l2cap_command_untimeout(ng_l2cap_cmd_p cmd)
{
if (!(cmd->flags & NG_L2CAP_CMD_PENDING))
panic(
"%s: %s - no command timeout, code=%#x, flags=%#x\n",
__func__, NG_NODE_NAME(cmd->con->l2cap->node),
cmd->code, cmd->flags);
if (ng_uncallout(&cmd->timo, cmd->con->l2cap->node) == 0)
return (ETIMEDOUT);
cmd->flags &= ~NG_L2CAP_CMD_PENDING;
return (0);
} /* ng_l2cap_command_untimeout */
/*
* Prepend "m"buf with "size" bytes
*/
struct mbuf *
ng_l2cap_prepend(struct mbuf *m, int size)
{
M_PREPEND(m, size, M_DONTWAIT);
if (m == NULL || (m->m_len < size && (m = m_pullup(m, size)) == NULL))
return (NULL);
return (m);
} /* ng_l2cap_prepend */
/*
* Default flow settings
*/
ng_l2cap_flow_p
ng_l2cap_default_flow(void)
{
static ng_l2cap_flow_t default_flow = {
/* flags */ 0x0,
/* service_type */ NG_HCI_SERVICE_TYPE_BEST_EFFORT,
/* token_rate */ 0xffffffff, /* maximum */
/* token_bucket_size */ 0xffffffff, /* maximum */
/* peak_bandwidth */ 0x00000000, /* maximum */
/* latency */ 0xffffffff, /* don't care */
/* delay_variation */ 0xffffffff /* don't care */
};
return (&default_flow);
} /* ng_l2cap_default_flow */
/*
* Get next available channel ID
* XXX FIXME this is *UGLY* but will do for now
*/
static u_int16_t
ng_l2cap_get_cid(ng_l2cap_p l2cap)
{
u_int16_t cid = l2cap->cid + 1;
if (cid < NG_L2CAP_FIRST_CID)
cid = NG_L2CAP_FIRST_CID;
while (cid != l2cap->cid) {
if (ng_l2cap_chan_by_scid(l2cap, cid) == NULL) {
l2cap->cid = cid;
return (cid);
}
cid ++;
if (cid < NG_L2CAP_FIRST_CID)
cid = NG_L2CAP_FIRST_CID;
}
return (NG_L2CAP_NULL_CID);
} /* ng_l2cap_get_cid */
/*
* Get next available command ident
* XXX FIXME this is *UGLY* but will do for now
*/
u_int8_t
ng_l2cap_get_ident(ng_l2cap_con_p con)
{
u_int8_t ident = con->ident + 1;
if (ident < NG_L2CAP_FIRST_IDENT)
ident = NG_L2CAP_FIRST_IDENT;
while (ident != con->ident) {
if (ng_l2cap_cmd_by_ident(con, ident) == NULL) {
con->ident = ident;
return (ident);
}
ident ++;
if (ident < NG_L2CAP_FIRST_IDENT)
ident = NG_L2CAP_FIRST_IDENT;
}
return (NG_L2CAP_NULL_IDENT);
} /* ng_l2cap_get_ident */