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freebsd-dev/sys/netgraph/bluetooth/drivers/h4/ng_h4.c
Dag-Erling Smørgrav 1ede983cc9 Retire the MALLOC and FREE macros. They are an abomination unto style(9). 
MFC after:	3 months
2008-10-23 15:53:51 +00:00

1021 lines
23 KiB
C
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/*
* ng_h4.c
*/
/*-
* Copyright (c) 2001-2002 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_h4.c,v 1.10 2005/10/31 17:57:43 max Exp $
* $FreeBSD$
*
* Based on:
* ---------
*
* FreeBSD: src/sys/netgraph/ng_tty.c
* Author: Archie Cobbs <archie@freebsd.org>
*
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/conf.h>
#include <sys/endian.h>
#include <sys/errno.h>
#include <sys/fcntl.h>
#include <sys/ioccom.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/priv.h>
#include <sys/socket.h>
#include <sys/tty.h>
#include <sys/ttycom.h>
#include <net/if.h>
#include <net/if_var.h>
#include <netgraph/ng_message.h>
#include <netgraph/netgraph.h>
#include <netgraph/ng_parse.h>
#include <netgraph/bluetooth/include/ng_bluetooth.h>
#include <netgraph/bluetooth/include/ng_hci.h>
#include <netgraph/bluetooth/include/ng_h4.h>
#include <netgraph/bluetooth/drivers/h4/ng_h4_var.h>
#include <netgraph/bluetooth/drivers/h4/ng_h4_prse.h>
/*****************************************************************************
*****************************************************************************
** This node implements a Bluetooth HCI UART transport layer as per chapter
** H4 of the Bluetooth Specification Book v1.1. It is a terminal line
** discipline that is also a netgraph node. Installing this line discipline
** on a terminal device instantiates a new netgraph node of this type, which
** allows access to the device via the "hook" hook of the node.
**
** Once the line discipline is installed, you can find out the name of the
** corresponding netgraph node via a NGIOCGINFO ioctl().
*****************************************************************************
*****************************************************************************/
/* MALLOC define */
#ifndef NG_SEPARATE_MALLOC
MALLOC_DEFINE(M_NETGRAPH_H4, "netgraph_h4", "Netgraph Bluetooth H4 node");
#else
#define M_NETGRAPH_H4 M_NETGRAPH
#endif /* NG_SEPARATE_MALLOC */
/* Line discipline methods */
static int ng_h4_open (struct cdev *, struct tty *);
static int ng_h4_close (struct tty *, int);
static int ng_h4_read (struct tty *, struct uio *, int);
static int ng_h4_write (struct tty *, struct uio *, int);
static int ng_h4_input (int, struct tty *);
static int ng_h4_start (struct tty *);
static int ng_h4_ioctl (struct tty *, u_long, caddr_t,
int, struct thread *);
/* Line discipline descriptor */
static struct linesw ng_h4_disc = {
ng_h4_open, /* open */
ng_h4_close, /* close */
ng_h4_read, /* read */
ng_h4_write, /* write */
ng_h4_ioctl, /* ioctl */
ng_h4_input, /* input */
ng_h4_start, /* start */
ttymodem /* modem */
};
/* Netgraph methods */
static ng_constructor_t ng_h4_constructor;
static ng_rcvmsg_t ng_h4_rcvmsg;
static ng_shutdown_t ng_h4_shutdown;
static ng_newhook_t ng_h4_newhook;
static ng_connect_t ng_h4_connect;
static ng_rcvdata_t ng_h4_rcvdata;
static ng_disconnect_t ng_h4_disconnect;
/* Other stuff */
static void ng_h4_process_timeout (node_p, hook_p, void *, int);
static int ng_h4_mod_event (module_t, int, void *);
/* Netgraph node type descriptor */
static struct ng_type typestruct = {
.version = NG_ABI_VERSION,
.name = NG_H4_NODE_TYPE,
.mod_event = ng_h4_mod_event,
.constructor = ng_h4_constructor,
.rcvmsg = ng_h4_rcvmsg,
.shutdown = ng_h4_shutdown,
.newhook = ng_h4_newhook,
.connect = ng_h4_connect,
.rcvdata = ng_h4_rcvdata,
.disconnect = ng_h4_disconnect,
.cmdlist = ng_h4_cmdlist
};
NETGRAPH_INIT(h4, &typestruct);
MODULE_VERSION(ng_h4, NG_BLUETOOTH_VERSION);
static int ng_h4_node = 0;
/*****************************************************************************
*****************************************************************************
** Line discipline methods
*****************************************************************************
*****************************************************************************/
/*
* Set our line discipline on the tty.
*/
static int
ng_h4_open(struct cdev *dev, struct tty *tp)
{
struct thread *td = curthread;
char name[NG_NODESIZ];
ng_h4_info_p sc = NULL;
int error;
/* Super-user only */
error = priv_check(td, PRIV_NETGRAPH_TTY); /* XXX */
if (error != 0)
return (error);
/* Initialize private struct */
sc = malloc(sizeof(*sc), M_NETGRAPH_H4, M_NOWAIT|M_ZERO);
if (sc == NULL)
return (ENOMEM);
sc->tp = tp;
sc->debug = NG_H4_WARN_LEVEL;
sc->state = NG_H4_W4_PKT_IND;
sc->want = 1;
sc->got = 0;
mtx_init(&sc->outq.ifq_mtx, "ng_h4 node+queue", NULL, MTX_DEF);
IFQ_SET_MAXLEN(&sc->outq, NG_H4_DEFAULTQLEN);
ng_callout_init(&sc->timo);
NG_H4_LOCK(sc);
/* Setup netgraph node */
error = ng_make_node_common(&typestruct, &sc->node);
if (error != 0) {
NG_H4_UNLOCK(sc);
printf("%s: Unable to create new node!\n", __func__);
mtx_destroy(&sc->outq.ifq_mtx);
bzero(sc, sizeof(*sc));
free(sc, M_NETGRAPH_H4);
return (error);
}
/* Assign node its name */
snprintf(name, sizeof(name), "%s%d", typestruct.name, ng_h4_node ++);
error = ng_name_node(sc->node, name);
if (error != 0) {
NG_H4_UNLOCK(sc);
printf("%s: %s - node name exists?\n", __func__, name);
NG_NODE_UNREF(sc->node);
mtx_destroy(&sc->outq.ifq_mtx);
bzero(sc, sizeof(*sc));
free(sc, M_NETGRAPH_H4);
return (error);
}
/* Set back pointers */
NG_NODE_SET_PRIVATE(sc->node, sc);
tp->t_lsc = (caddr_t) sc;
/* The node has to be a WRITER because data can change node status */
NG_NODE_FORCE_WRITER(sc->node);
/*
* Pre-allocate cblocks to the an appropriate amount.
* I'm not sure what is appropriate.
*/
ttyflush(tp, FREAD | FWRITE);
clist_alloc_cblocks(&tp->t_canq, 0, 0);
clist_alloc_cblocks(&tp->t_rawq, 0, 0);
clist_alloc_cblocks(&tp->t_outq,
MLEN + NG_H4_HIWATER, MLEN + NG_H4_HIWATER);
NG_H4_UNLOCK(sc);
return (error);
} /* ng_h4_open */
/*
* Line specific close routine, called from device close routine
* and from ttioctl. This causes the node to be destroyed as well.
*/
static int
ng_h4_close(struct tty *tp, int flag)
{
ng_h4_info_p sc = (ng_h4_info_p) tp->t_lsc;
ttyflush(tp, FREAD | FWRITE);
clist_free_cblocks(&tp->t_outq);
if (sc != NULL) {
NG_H4_LOCK(sc);
if (callout_pending(&sc->timo))
ng_uncallout(&sc->timo, sc->node);
tp->t_lsc = NULL;
sc->dying = 1;
NG_H4_UNLOCK(sc);
ng_rmnode_self(sc->node);
}
return (0);
} /* ng_h4_close */
/*
* Once the device has been turned into a node, we don't allow reading.
*/
static int
ng_h4_read(struct tty *tp, struct uio *uio, int flag)
{
return (EIO);
} /* ng_h4_read */
/*
* Once the device has been turned into a node, we don't allow writing.
*/
static int
ng_h4_write(struct tty *tp, struct uio *uio, int flag)
{
return (EIO);
} /* ng_h4_write */
/*
* We implement the NGIOCGINFO ioctl() defined in ng_message.h.
*/
static int
ng_h4_ioctl(struct tty *tp, u_long cmd, caddr_t data, int flag,
struct thread *td)
{
ng_h4_info_p sc = (ng_h4_info_p) tp->t_lsc;
int error = 0;
if (sc == NULL)
return (ENXIO);
NG_H4_LOCK(sc);
switch (cmd) {
case NGIOCGINFO:
#undef NI
#define NI(x) ((struct nodeinfo *)(x))
bzero(data, sizeof(*NI(data)));
if (NG_NODE_HAS_NAME(sc->node))
strncpy(NI(data)->name, NG_NODE_NAME(sc->node),
sizeof(NI(data)->name) - 1);
strncpy(NI(data)->type, sc->node->nd_type->name,
sizeof(NI(data)->type) - 1);
NI(data)->id = (u_int32_t) ng_node2ID(sc->node);
NI(data)->hooks = NG_NODE_NUMHOOKS(sc->node);
break;
default:
error = ENOIOCTL;
break;
}
NG_H4_UNLOCK(sc);
return (error);
} /* ng_h4_ioctl */
/*
* Receive data coming from the device. We get one character at a time, which
* is kindof silly.
*/
static int
ng_h4_input(int c, struct tty *tp)
{
ng_h4_info_p sc = (ng_h4_info_p) tp->t_lsc;
if (sc == NULL || tp != sc->tp ||
sc->node == NULL || NG_NODE_NOT_VALID(sc->node))
return (0);
NG_H4_LOCK(sc);
/* Check for error conditions */
if ((tp->t_state & TS_CONNECTED) == 0) {
NG_H4_INFO("%s: %s - no carrier\n", __func__,
NG_NODE_NAME(sc->node));
sc->state = NG_H4_W4_PKT_IND;
sc->want = 1;
sc->got = 0;
NG_H4_UNLOCK(sc);
return (0); /* XXX Loss of synchronization here! */
}
/* Check for framing error or overrun on this char */
if (c & TTY_ERRORMASK) {
NG_H4_ERR("%s: %s - line error %#x, c=%#x\n", __func__,
NG_NODE_NAME(sc->node), c & TTY_ERRORMASK,
c & TTY_CHARMASK);
NG_H4_STAT_IERROR(sc->stat);
sc->state = NG_H4_W4_PKT_IND;
sc->want = 1;
sc->got = 0;
NG_H4_UNLOCK(sc);
return (0); /* XXX Loss of synchronization here! */
}
NG_H4_STAT_BYTES_RECV(sc->stat, 1);
/* Append char to mbuf */
if (sc->got >= sizeof(sc->ibuf)) {
NG_H4_ALERT("%s: %s - input buffer overflow, c=%#x, got=%d\n",
__func__, NG_NODE_NAME(sc->node), c & TTY_CHARMASK,
sc->got);
NG_H4_STAT_IERROR(sc->stat);
sc->state = NG_H4_W4_PKT_IND;
sc->want = 1;
sc->got = 0;
NG_H4_UNLOCK(sc);
return (0); /* XXX Loss of synchronization here! */
}
sc->ibuf[sc->got ++] = (c & TTY_CHARMASK);
NG_H4_INFO("%s: %s - got char %#x, want=%d, got=%d\n", __func__,
NG_NODE_NAME(sc->node), c, sc->want, sc->got);
if (sc->got < sc->want) {
NG_H4_UNLOCK(sc);
return (0); /* Wait for more */
}
switch (sc->state) {
/* Got packet indicator */
case NG_H4_W4_PKT_IND:
NG_H4_INFO("%s: %s - got packet indicator %#x\n", __func__,
NG_NODE_NAME(sc->node), sc->ibuf[0]);
sc->state = NG_H4_W4_PKT_HDR;
/*
* Since packet indicator included in the packet header
* just set sc->want to sizeof(packet header).
*/
switch (sc->ibuf[0]) {
case NG_HCI_ACL_DATA_PKT:
sc->want = sizeof(ng_hci_acldata_pkt_t);
break;
case NG_HCI_SCO_DATA_PKT:
sc->want = sizeof(ng_hci_scodata_pkt_t);
break;
case NG_HCI_EVENT_PKT:
sc->want = sizeof(ng_hci_event_pkt_t);
break;
default:
NG_H4_WARN("%s: %s - ignoring unknown packet " \
"type=%#x\n", __func__, NG_NODE_NAME(sc->node),
sc->ibuf[0]);
NG_H4_STAT_IERROR(sc->stat);
sc->state = NG_H4_W4_PKT_IND;
sc->want = 1;
sc->got = 0;
break;
}
break;
/* Got packet header */
case NG_H4_W4_PKT_HDR:
sc->state = NG_H4_W4_PKT_DATA;
switch (sc->ibuf[0]) {
case NG_HCI_ACL_DATA_PKT:
c = le16toh(((ng_hci_acldata_pkt_t *)
(sc->ibuf))->length);
break;
case NG_HCI_SCO_DATA_PKT:
c = ((ng_hci_scodata_pkt_t *)(sc->ibuf))->length;
break;
case NG_HCI_EVENT_PKT:
c = ((ng_hci_event_pkt_t *)(sc->ibuf))->length;
break;
default:
KASSERT((0), ("Invalid packet type=%#x\n",
sc->ibuf[0]));
break;
}
NG_H4_INFO("%s: %s - got packet header, packet type=%#x, " \
"packet size=%d, payload size=%d\n", __func__,
NG_NODE_NAME(sc->node), sc->ibuf[0], sc->got, c);
if (c > 0) {
sc->want += c;
/*
* Try to prevent possible buffer overrun
*
* XXX I'm *really* confused here. It turns out
* that Xircom card sends us packets with length
* greater then 512 bytes! This is greater then
* our old receive buffer (ibuf) size. In the same
* time the card demands from us *not* to send
* packets greater then 192 bytes. Weird! How the
* hell i should know how big *receive* buffer
* should be? For now increase receiving buffer
* size to 1K and add the following check.
*/
if (sc->want >= sizeof(sc->ibuf)) {
int b;
NG_H4_ALERT("%s: %s - packet too big for " \
"buffer, type=%#x, got=%d, want=%d, " \
"length=%d\n", __func__,
NG_NODE_NAME(sc->node), sc->ibuf[0],
sc->got, sc->want, c);
NG_H4_ALERT("Packet header:\n");
for (b = 0; b < sc->got; b++)
NG_H4_ALERT("%#x ", sc->ibuf[b]);
NG_H4_ALERT("\n");
/* Reset state */
NG_H4_STAT_IERROR(sc->stat);
sc->state = NG_H4_W4_PKT_IND;
sc->want = 1;
sc->got = 0;
}
break;
}
/* else FALLTHROUGH and deliver frame */
/* XXX Is this true? Should we deliver empty frame? */
/* Got packet data */
case NG_H4_W4_PKT_DATA:
NG_H4_INFO("%s: %s - got full packet, packet type=%#x, " \
"packet size=%d\n", __func__,
NG_NODE_NAME(sc->node), sc->ibuf[0], sc->got);
if (sc->hook != NULL && NG_HOOK_IS_VALID(sc->hook)) {
struct mbuf *m = NULL;
MGETHDR(m, M_DONTWAIT, MT_DATA);
if (m != NULL) {
m->m_pkthdr.len = 0;
/* XXX m_copyback() is stupid */
m->m_len = min(MHLEN, sc->got);
m_copyback(m, 0, sc->got, sc->ibuf);
NG_SEND_DATA_ONLY(c, sc->hook, m);
} else {
NG_H4_ERR("%s: %s - could not get mbuf\n",
__func__, NG_NODE_NAME(sc->node));
NG_H4_STAT_IERROR(sc->stat);
}
}
sc->state = NG_H4_W4_PKT_IND;
sc->want = 1;
sc->got = 0;
NG_H4_STAT_PCKTS_RECV(sc->stat);
break;
default:
KASSERT((0), ("Invalid H4 node state=%d", sc->state));
break;
}
NG_H4_UNLOCK(sc);
return (0);
} /* ng_h4_input */
/*
* This is called when the device driver is ready for more output. Called from
* tty system.
*/
static int
ng_h4_start(struct tty *tp)
{
ng_h4_info_p sc = (ng_h4_info_p) tp->t_lsc;
struct mbuf *m = NULL;
int size;
if (sc == NULL || tp != sc->tp ||
sc->node == NULL || NG_NODE_NOT_VALID(sc->node))
return (0);
#if 0
while (tp->t_outq.c_cc < NG_H4_HIWATER) { /* XXX 2.2 specific ? */
#else
while (1) {
#endif
/* Remove first mbuf from queue */
IF_DEQUEUE(&sc->outq, m);
if (m == NULL)
break;
/* Send as much of it as possible */
while (m != NULL) {
size = m->m_len - b_to_q(mtod(m, u_char *),
m->m_len, &tp->t_outq);
NG_H4_LOCK(sc);
NG_H4_STAT_BYTES_SENT(sc->stat, size);
NG_H4_UNLOCK(sc);
m->m_data += size;
m->m_len -= size;
if (m->m_len > 0)
break; /* device can't take no more */
m = m_free(m);
}
/* Put remainder of mbuf chain (if any) back on queue */
if (m != NULL) {
IF_PREPEND(&sc->outq, m);
break;
}
/* Full packet has been sent */
NG_H4_LOCK(sc);
NG_H4_STAT_PCKTS_SENT(sc->stat);
NG_H4_UNLOCK(sc);
}
/*
* Call output process whether or not there is any output. We are
* being called in lieu of ttstart and must do what it would.
*/
tt_oproc(sc->tp);
/*
* This timeout is needed for operation on a pseudo-tty, because the
* pty code doesn't call pppstart after it has drained the t_outq.
*/
NG_H4_LOCK(sc);
if (!IFQ_IS_EMPTY(&sc->outq) && !callout_pending(&sc->timo))
ng_callout(&sc->timo, sc->node, NULL, 1,
ng_h4_process_timeout, NULL, 0);
NG_H4_UNLOCK(sc);
return (0);
} /* ng_h4_start */
/*****************************************************************************
*****************************************************************************
** Netgraph node methods
*****************************************************************************
*****************************************************************************/
/*
* Initialize a new node of this type. We only allow nodes to be created as
* a result of setting the line discipline on a tty, so always return an error
* if not.
*/
static int
ng_h4_constructor(node_p node)
{
return (EOPNOTSUPP);
} /* ng_h4_constructor */
/*
* Add a new hook. There can only be one.
*/
static int
ng_h4_newhook(node_p node, hook_p hook, const char *name)
{
ng_h4_info_p sc = (ng_h4_info_p) NG_NODE_PRIVATE(node);
if (strcmp(name, NG_H4_HOOK) != 0)
return (EINVAL);
NG_H4_LOCK(sc);
if (sc->hook != NULL) {
NG_H4_UNLOCK(sc);
return (EISCONN);
}
sc->hook = hook;
NG_H4_UNLOCK(sc);
return (0);
} /* ng_h4_newhook */
/*
* Connect hook. Just say yes.
*/
static int
ng_h4_connect(hook_p hook)
{
ng_h4_info_p sc = (ng_h4_info_p) NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
if (hook != sc->hook)
panic("%s: hook != sc->hook\n", __func__);
NG_HOOK_FORCE_QUEUE(NG_HOOK_PEER(hook));
NG_HOOK_FORCE_QUEUE(hook);
return (0);
} /* ng_h4_connect */
/*
* Disconnect the hook
*/
static int
ng_h4_disconnect(hook_p hook)
{
ng_h4_info_p sc = (ng_h4_info_p) NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
/*
* We need to check for sc != NULL because we can be called from
* ng_h4_close() via ng_rmnode_self()
*/
if (sc != NULL) {
if (hook != sc->hook)
panic("%s: hook != sc->hook\n", __func__);
NG_H4_LOCK(sc);
/* XXX do we have to untimeout and drain out queue? */
if (callout_pending(&sc->timo))
ng_uncallout(&sc->timo, sc->node);
_IF_DRAIN(&sc->outq);
sc->state = NG_H4_W4_PKT_IND;
sc->want = 1;
sc->got = 0;
sc->hook = NULL;
NG_H4_UNLOCK(sc);
}
return (0);
} /* ng_h4_disconnect */
/*
* Remove this node. The does the netgraph portion of the shutdown.
* This should only be called indirectly from ng_h4_close().
*/
static int
ng_h4_shutdown(node_p node)
{
ng_h4_info_p sc = (ng_h4_info_p) NG_NODE_PRIVATE(node);
NG_H4_LOCK(sc);
if (!sc->dying) {
NG_H4_UNLOCK(sc);
NG_NODE_REVIVE(node); /* we will persist */
return (EOPNOTSUPP);
}
NG_H4_UNLOCK(sc);
NG_NODE_SET_PRIVATE(node, NULL);
_IF_DRAIN(&sc->outq);
NG_NODE_UNREF(node);
mtx_destroy(&sc->outq.ifq_mtx);
bzero(sc, sizeof(*sc));
free(sc, M_NETGRAPH_H4);
return (0);
} /* ng_h4_shutdown */
/*
* Receive incoming data from Netgraph system. Put it on our
* output queue and start output if necessary.
*/
static int
ng_h4_rcvdata(hook_p hook, item_p item)
{
ng_h4_info_p sc = (ng_h4_info_p)NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
struct mbuf *m = NULL;
int qlen;
if (sc == NULL)
return (EHOSTDOWN);
if (hook != sc->hook)
panic("%s: hook != sc->hook\n", __func__);
NGI_GET_M(item, m);
NG_FREE_ITEM(item);
NG_H4_LOCK(sc);
if (_IF_QFULL(&sc->outq)) {
NG_H4_ERR("%s: %s - dropping mbuf, len=%d\n", __func__,
NG_NODE_NAME(sc->node), m->m_pkthdr.len);
NG_H4_STAT_OERROR(sc->stat);
_IF_DROP(&sc->outq);
NG_H4_UNLOCK(sc);
NG_FREE_M(m);
return (ENOBUFS);
}
NG_H4_INFO("%s: %s - queue mbuf, len=%d\n", __func__,
NG_NODE_NAME(sc->node), m->m_pkthdr.len);
_IF_ENQUEUE(&sc->outq, m);
qlen = _IF_QLEN(&sc->outq);
NG_H4_UNLOCK(sc);
/*
* If qlen > 1, then we should already have a scheduled callout
*/
if (qlen == 1) {
mtx_lock(&Giant);
ng_h4_start(sc->tp);
mtx_unlock(&Giant);
}
return (0);
} /* ng_h4_rcvdata */
/*
* Receive control message
*/
static int
ng_h4_rcvmsg(node_p node, item_p item, hook_p lasthook)
{
ng_h4_info_p sc = (ng_h4_info_p) NG_NODE_PRIVATE(node);
struct ng_mesg *msg = NULL, *resp = NULL;
int error = 0;
if (sc == NULL)
return (EHOSTDOWN);
NGI_GET_MSG(item, msg);
NG_H4_LOCK(sc);
switch (msg->header.typecookie) {
case NGM_GENERIC_COOKIE:
switch (msg->header.cmd) {
case NGM_TEXT_STATUS:
NG_MKRESPONSE(resp, msg, NG_TEXTRESPONSE, M_NOWAIT);
if (resp == NULL)
error = ENOMEM;
else
snprintf(resp->data, NG_TEXTRESPONSE,
"Hook: %s\n" \
"Debug: %d\n" \
"State: %d\n" \
"Queue: [have:%d,max:%d]\n" \
"Input: [got:%d,want:%d]",
(sc->hook != NULL)? NG_H4_HOOK : "",
sc->debug,
sc->state,
_IF_QLEN(&sc->outq),
sc->outq.ifq_maxlen,
sc->got,
sc->want);
break;
default:
error = EINVAL;
break;
}
break;
case NGM_H4_COOKIE:
switch (msg->header.cmd) {
case NGM_H4_NODE_RESET:
_IF_DRAIN(&sc->outq);
sc->state = NG_H4_W4_PKT_IND;
sc->want = 1;
sc->got = 0;
break;
case NGM_H4_NODE_GET_STATE:
NG_MKRESPONSE(resp, msg, sizeof(ng_h4_node_state_ep),
M_NOWAIT);
if (resp == NULL)
error = ENOMEM;
else
*((ng_h4_node_state_ep *)(resp->data)) =
sc->state;
break;
case NGM_H4_NODE_GET_DEBUG:
NG_MKRESPONSE(resp, msg, sizeof(ng_h4_node_debug_ep),
M_NOWAIT);
if (resp == NULL)
error = ENOMEM;
else
*((ng_h4_node_debug_ep *)(resp->data)) =
sc->debug;
break;
case NGM_H4_NODE_SET_DEBUG:
if (msg->header.arglen != sizeof(ng_h4_node_debug_ep))
error = EMSGSIZE;
else
sc->debug =
*((ng_h4_node_debug_ep *)(msg->data));
break;
case NGM_H4_NODE_GET_QLEN:
NG_MKRESPONSE(resp, msg, sizeof(ng_h4_node_qlen_ep),
M_NOWAIT);
if (resp == NULL)
error = ENOMEM;
else
*((ng_h4_node_qlen_ep *)(resp->data)) =
sc->outq.ifq_maxlen;
break;
case NGM_H4_NODE_SET_QLEN:
if (msg->header.arglen != sizeof(ng_h4_node_qlen_ep))
error = EMSGSIZE;
else if (*((ng_h4_node_qlen_ep *)(msg->data)) <= 0)
error = EINVAL;
else
IFQ_SET_MAXLEN(&sc->outq,
*((ng_h4_node_qlen_ep *)(msg->data)));
break;
case NGM_H4_NODE_GET_STAT:
NG_MKRESPONSE(resp, msg, sizeof(ng_h4_node_stat_ep),
M_NOWAIT);
if (resp == NULL)
error = ENOMEM;
else
bcopy(&sc->stat, resp->data,
sizeof(ng_h4_node_stat_ep));
break;
case NGM_H4_NODE_RESET_STAT:
NG_H4_STAT_RESET(sc->stat);
break;
default:
error = EINVAL;
break;
}
break;
default:
error = EINVAL;
break;
}
NG_H4_UNLOCK(sc);
NG_RESPOND_MSG(error, node, item, resp);
NG_FREE_MSG(msg);
return (error);
} /* ng_h4_rcvmsg */
/*
* Timeout processing function.
* We still have data to output to the device, so try sending more.
*/
static void
ng_h4_process_timeout(node_p node, hook_p hook, void *arg1, int arg2)
{
ng_h4_info_p sc = (ng_h4_info_p) NG_NODE_PRIVATE(node);
mtx_lock(&Giant);
ng_h4_start(sc->tp);
mtx_unlock(&Giant);
} /* ng_h4_process_timeout */
/*
* Handle loading and unloading for this node type
*/
static int
ng_h4_mod_event(module_t mod, int event, void *data)
{
static int ng_h4_ldisc;
int error = 0;
switch (event) {
case MOD_LOAD:
/* Register line discipline */
mtx_lock(&Giant);
ng_h4_ldisc = ldisc_register(H4DISC, &ng_h4_disc);
mtx_unlock(&Giant);
if (ng_h4_ldisc < 0) {
printf("%s: can't register H4 line discipline\n",
__func__);
error = EIO;
}
break;
case MOD_UNLOAD:
/* Unregister line discipline */
mtx_lock(&Giant);
ldisc_deregister(ng_h4_ldisc);
mtx_unlock(&Giant);
break;
default:
error = EOPNOTSUPP;
break;
}
return (error);
} /* ng_h4_mod_event */
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