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📄 netgraph.h(41.17 KB)
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📄 ng_UI.h(2.36 KB)
📄 ng_async.c(16.51 KB)
📄 ng_async.h(4.05 KB)
📄 ng_atmllc.c(7.25 KB)
📄 ng_atmllc.h(1.85 KB)
📄 ng_base.c(100.62 KB)
📄 ng_bpf.c(14.66 KB)
📄 ng_bpf.h(3.97 KB)
📄 ng_bridge.c(29.37 KB)
📄 ng_bridge.h(7.58 KB)
📄 ng_car.c(19.62 KB)
📄 ng_car.h(4.6 KB)
📄 ng_checksum.c(15.85 KB)
📄 ng_checksum.h(2.63 KB)
📄 ng_cisco.c(15.47 KB)
📄 ng_cisco.h(3.39 KB)
📄 ng_deflate.c(17.09 KB)
📄 ng_deflate.h(2.85 KB)
📄 ng_device.c(10.65 KB)
📄 ng_device.h(1.74 KB)
📄 ng_echo.c(3.52 KB)
📄 ng_echo.h(2.28 KB)
📄 ng_eiface.c(16.31 KB)
📄 ng_eiface.h(2.09 KB)
📄 ng_etf.c(12.84 KB)
📄 ng_etf.h(3.05 KB)
📄 ng_ether.c(22.26 KB)
📄 ng_ether.h(3.22 KB)
📄 ng_ether_echo.c(4.17 KB)
📄 ng_ether_echo.h(2.32 KB)
📄 ng_frame_relay.c(13.21 KB)
📄 ng_frame_relay.h(2.51 KB)
📄 ng_gif.c(15.86 KB)
📄 ng_gif.h(4.04 KB)
📄 ng_gif_demux.c(10.83 KB)
📄 ng_gif_demux.h(2.05 KB)
📄 ng_hole.c(5.85 KB)
📄 ng_hole.h(2.69 KB)
📄 ng_hub.c(4.33 KB)
📄 ng_hub.h(1.68 KB)
📄 ng_iface.c(19.58 KB)
📄 ng_iface.h(2.68 KB)
📄 ng_ip_input.c(4.97 KB)
📄 ng_ip_input.h(3.78 KB)
📄 ng_ipfw.c(8.29 KB)
📄 ng_ipfw.h(1.54 KB)
📄 ng_ksocket.c(33.9 KB)
📄 ng_ksocket.h(3.86 KB)
📄 ng_l2tp.c(40.16 KB)
📄 ng_l2tp.h(8.12 KB)
📄 ng_lmi.c(28.15 KB)
📄 ng_lmi.h(3.2 KB)
📄 ng_macfilter.c(24.45 KB)
📄 ng_macfilter.h(5.7 KB)
📄 ng_message.h(14.69 KB)
📄 ng_mppc.c(23.88 KB)
📄 ng_mppc.h(3.29 KB)
📄 ng_nat.c(23.43 KB)
📄 ng_nat.h(6.87 KB)
📄 ng_one2many.c(15.88 KB)
📄 ng_one2many.h(4.56 KB)
📄 ng_parse.c(43.85 KB)
📄 ng_parse.h(18.49 KB)
📄 ng_patch.c(15.54 KB)
📄 ng_patch.h(3.64 KB)
📄 ng_pipe.c(26.97 KB)
📄 ng_pipe.h(5.56 KB)
📄 ng_ppp.c(72.27 KB)
📄 ng_ppp.h(9.77 KB)
📄 ng_pppoe.c(58.34 KB)
📄 ng_pppoe.h(9.64 KB)
📄 ng_pptpgre.c(36.05 KB)
📄 ng_pptpgre.h(6.04 KB)
📄 ng_pred1.c(18.02 KB)
📄 ng_pred1.h(2.73 KB)
📄 ng_rfc1490.c(13.33 KB)
📄 ng_rfc1490.h(2.62 KB)
📄 ng_sample.c(15.14 KB)
📄 ng_sample.h(3.53 KB)
📄 ng_socket.c(29.91 KB)
📄 ng_socket.h(2.73 KB)
📄 ng_socketvar.h(2.51 KB)
📄 ng_source.c(21.72 KB)
📄 ng_source.h(4.96 KB)
📄 ng_split.c(4.54 KB)
📄 ng_split.h(1.84 KB)
📄 ng_sppp.c(9.39 KB)
📄 ng_sppp.h(1.03 KB)
📄 ng_tag.c(19.05 KB)
📄 ng_tag.h(4.55 KB)
📄 ng_tcpmss.c(10.63 KB)
📄 ng_tcpmss.h(2.73 KB)
📄 ng_tee.c(10.61 KB)
📄 ng_tee.h(3.51 KB)
📄 ng_tty.c(11.96 KB)
📄 ng_tty.h(2.49 KB)
📄 ng_vjc.c(15.66 KB)
📄 ng_vjc.h(3.5 KB)
📄 ng_vlan.c(17.61 KB)
📄 ng_vlan.h(3.47 KB)

Editing: ng_device.c

/*-
 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
 *
 * Copyright (c) 2002 Mark Santcroos <marks@ripe.net>
 * Copyright (c) 2004-2005 Gleb Smirnoff <glebius@FreeBSD.org>
 *
 * 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 ``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 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.
 *
 * Netgraph "device" node
 *
 * This node presents a /dev/ngd%d device that interfaces to an other
 * netgraph node.
 *
 * $FreeBSD$
 *
 */

#if 0
#define	DBG do { printf("ng_device: %s\n", __func__ ); } while (0)
#else
#define	DBG do {} while (0)
#endif

#include <sys/param.h>
#include <sys/conf.h>
#include <sys/ioccom.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/poll.h>
#include <sys/proc.h>
#include <sys/epoch.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/systm.h>
#include <sys/uio.h>
#include <sys/vnode.h>

#include <net/if.h>
#include <net/if_var.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>

#include <netgraph/ng_message.h>
#include <netgraph/netgraph.h>
#include <netgraph/ng_device.h>

#define	ERROUT(x) do { error = (x); goto done; } while (0)

/* Netgraph methods */
static int		ng_device_mod_event(module_t, int, void *);
static ng_constructor_t	ng_device_constructor;
static ng_rcvmsg_t	ng_device_rcvmsg;
static ng_shutdown_t	ng_device_shutdown;
static ng_newhook_t	ng_device_newhook;
static ng_rcvdata_t	ng_device_rcvdata;
static ng_disconnect_t	ng_device_disconnect;

/* Netgraph type */
static struct ng_type ngd_typestruct = {
	.version =	NG_ABI_VERSION,
	.name =		NG_DEVICE_NODE_TYPE,
	.mod_event =	ng_device_mod_event,
	.constructor =	ng_device_constructor,
	.rcvmsg	=	ng_device_rcvmsg,
	.shutdown = 	ng_device_shutdown,
	.newhook =	ng_device_newhook,
	.rcvdata =	ng_device_rcvdata,
	.disconnect =	ng_device_disconnect,
};
NETGRAPH_INIT(device, &ngd_typestruct);

/* per node data */
struct ngd_private {
	struct	ifqueue	readq;
	struct	ng_node	*node;
	struct	ng_hook	*hook;
	struct	cdev	*ngddev;
	struct	mtx	ngd_mtx;
	int 		unit;
	uint16_t	flags;
#define	NGDF_OPEN	0x0001
#define	NGDF_RWAIT	0x0002
};
typedef struct ngd_private *priv_p;

/* unit number allocator entity */
static struct unrhdr *ngd_unit;

/* Maximum number of NGD devices */
#define MAX_NGD	999

static d_close_t ngdclose;
static d_open_t ngdopen;
static d_read_t ngdread;
static d_write_t ngdwrite;
#if 0
static d_ioctl_t ngdioctl;
#endif
static d_poll_t ngdpoll;

static struct cdevsw ngd_cdevsw = {
	.d_version =	D_VERSION,
	.d_open =	ngdopen,
	.d_close =	ngdclose,
	.d_read =	ngdread,
	.d_write =	ngdwrite,
#if 0
	.d_ioctl =	ngdioctl,
#endif
	.d_poll =	ngdpoll,
	.d_name =	NG_DEVICE_DEVNAME,
};

/******************************************************************************
 *  Netgraph methods
 ******************************************************************************/

/*
 * Handle loading and unloading for this node type.
 */
static int
ng_device_mod_event(module_t mod, int event, void *data)
{
	int error = 0;

switch (event) {
	case MOD_LOAD:
		ngd_unit = new_unrhdr(0, MAX_NGD, NULL);
		break;
	case MOD_UNLOAD:
		delete_unrhdr(ngd_unit);
		break;
	default:
		error = EOPNOTSUPP;
		break;
	}
	return (error);
}

/*
 * create new node
 */
static int
ng_device_constructor(node_p node)
{
	priv_p	priv;

DBG;

priv = malloc(sizeof(*priv), M_NETGRAPH, M_WAITOK | M_ZERO);

/* Allocate unit number */
	priv->unit = alloc_unr(ngd_unit);

/* Initialize mutexes and queue */
	mtx_init(&priv->ngd_mtx, "ng_device", NULL, MTX_DEF);
	mtx_init(&priv->readq.ifq_mtx, "ng_device queue", NULL, MTX_DEF);
	IFQ_SET_MAXLEN(&priv->readq, ifqmaxlen);

/* Link everything together */
	NG_NODE_SET_PRIVATE(node, priv);
	priv->node = node;

priv->ngddev = make_dev(&ngd_cdevsw, priv->unit, UID_ROOT,
	    GID_WHEEL, 0600, NG_DEVICE_DEVNAME "%d", priv->unit);
	if(priv->ngddev == NULL) {
		printf("%s(): make_dev() failed\n",__func__);
		mtx_destroy(&priv->ngd_mtx);
		mtx_destroy(&priv->readq.ifq_mtx);
		free_unr(ngd_unit, priv->unit);
		free(priv, M_NETGRAPH);
		return(EINVAL);
	}
	/* XXX: race here? */
	priv->ngddev->si_drv1 = priv;

return(0);
}

/*
 * Process control message.
 */

static int
ng_device_rcvmsg(node_p node, item_p item, hook_p lasthook)
{
	const priv_p priv = NG_NODE_PRIVATE(node);
	struct ng_mesg *msg;
	struct ng_mesg *resp = NULL;
	const char *dn;
	int error = 0;

NGI_GET_MSG(item, msg);

if (msg->header.typecookie == NGM_DEVICE_COOKIE) {
		switch (msg->header.cmd) {
		case NGM_DEVICE_GET_DEVNAME:
			/* XXX: Fix when MAX_NGD us bigger */
			NG_MKRESPONSE(resp, msg,
			    strlen(NG_DEVICE_DEVNAME) + 4, M_NOWAIT);

if (resp == NULL)
				ERROUT(ENOMEM);

dn = devtoname(priv->ngddev);
			strlcpy((char *)resp->data, dn, strlen(dn) + 1);
			break;

default:
			error = EINVAL;
			break;
		}
	} else
		error = EINVAL;

done:
	NG_RESPOND_MSG(error, node, item, resp);
	NG_FREE_MSG(msg);
	return (error);
}

/*
 * Accept incoming hook. We support only one hook per node.
 */
static int
ng_device_newhook(node_p node, hook_p hook, const char *name)
{
	priv_p priv = NG_NODE_PRIVATE(node);

DBG;

/* We have only one hook per node */
	if (priv->hook != NULL)
		return (EISCONN);

priv->hook = hook;

return(0);
}

/*
 * Receive data from hook, write it to device.
 */
static int
ng_device_rcvdata(hook_p hook, item_p item)
{
	priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
	struct mbuf *m;

DBG;

NGI_GET_M(item, m);
	NG_FREE_ITEM(item);

IF_LOCK(&priv->readq);
	if (_IF_QFULL(&priv->readq)) {
		IF_UNLOCK(&priv->readq);
		NG_FREE_M(m);
		return (ENOBUFS);
	}

_IF_ENQUEUE(&priv->readq, m);
	IF_UNLOCK(&priv->readq);
	mtx_lock(&priv->ngd_mtx);
	if (priv->flags & NGDF_RWAIT) {
		priv->flags &= ~NGDF_RWAIT;
		wakeup(priv);
	}
	mtx_unlock(&priv->ngd_mtx);

return(0);
}

/*
 * Removal of the hook destroys the node.
 */
static int
ng_device_disconnect(hook_p hook)
{
	priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));

DBG;

destroy_dev(priv->ngddev);
	mtx_destroy(&priv->ngd_mtx);

IF_DRAIN(&priv->readq);
	mtx_destroy(&(priv)->readq.ifq_mtx);

free_unr(ngd_unit, priv->unit);

free(priv, M_NETGRAPH);

ng_rmnode_self(NG_HOOK_NODE(hook));

return(0);
}

/*
 * Node shutdown. Everything is already done in disconnect method.
 */
static int
ng_device_shutdown(node_p node)
{
	NG_NODE_UNREF(node);
	return (0);
}

/******************************************************************************
 *  Device methods
 ******************************************************************************/

/*
 * the device is opened
 */
static int
ngdopen(struct cdev *dev, int flag, int mode, struct thread *td)
{
	priv_p	priv = (priv_p )dev->si_drv1;

DBG;

mtx_lock(&priv->ngd_mtx);
	priv->flags |= NGDF_OPEN;
	mtx_unlock(&priv->ngd_mtx);

return(0);
}

/*
 * the device is closed
 */
static int
ngdclose(struct cdev *dev, int flag, int mode, struct thread *td)
{
	priv_p	priv = (priv_p )dev->si_drv1;

DBG;
	mtx_lock(&priv->ngd_mtx);
	priv->flags &= ~NGDF_OPEN;
	mtx_unlock(&priv->ngd_mtx);

return(0);
}

#if 0	/*
	 * The ioctl is transformed into netgraph control message.
	 * We do not process them, yet.
	 */
/*
 * process ioctl
 *
 * they are translated into netgraph messages and passed on
 *
 */
static int
ngdioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread *td)
{
	struct ngd_softc *sc = &ngd_softc;
	struct ngd_connection * connection = NULL;
	struct ngd_connection * tmp;
	int error = 0;
	struct ng_mesg *msg;
	struct ngd_param_s * datap;

DBG;

NG_MKMESSAGE(msg, NGM_DEVICE_COOKIE, cmd, sizeof(struct ngd_param_s),
			M_NOWAIT);
	if (msg == NULL) {
		printf("%s(): msg == NULL\n",__func__);
		goto nomsg;
	}

/* pass the ioctl data into the ->data area */
	datap = (struct ngd_param_s *)msg->data;
	datap->p = addr;

NG_SEND_MSG_HOOK(error, sc->node, msg, connection->active_hook, 0);
	if(error)
		printf("%s(): NG_SEND_MSG_HOOK error: %d\n",__func__,error);

nomsg:

return(0);
}
#endif /* if 0 */

/*
 * This function is called when a read(2) is done to our device.
 * We process one mbuf from queue.
 */
static int
ngdread(struct cdev *dev, struct uio *uio, int flag)
{
	priv_p	priv = (priv_p )dev->si_drv1;
	struct mbuf *m;
	int len, error = 0;

DBG;

/* get an mbuf */
	do {
		IF_DEQUEUE(&priv->readq, m);
		if (m == NULL) {
			if (flag & IO_NDELAY)
				return (EWOULDBLOCK);
			mtx_lock(&priv->ngd_mtx);
			priv->flags |= NGDF_RWAIT;
			if ((error = msleep(priv, &priv->ngd_mtx,
			    PDROP | PCATCH | (PZERO + 1),
			    "ngdread", 0)) != 0)
				return (error);
		}
	} while (m == NULL);

while (m && uio->uio_resid > 0 && error == 0) {
		len = MIN(uio->uio_resid, m->m_len);
		if (len != 0)
			error = uiomove(mtod(m, void *), len, uio);
		m = m_free(m);
	}

if (m)
		m_freem(m);

return (error);
}

/*
 * This function is called when our device is written to.
 * We read the data from userland into mbuf chain and pass it to the remote hook.
 *
 */
static int
ngdwrite(struct cdev *dev, struct uio *uio, int flag)
{
	struct epoch_tracker et;
	priv_p	priv = (priv_p )dev->si_drv1;
	struct mbuf *m;
	int error = 0;

DBG;

if (uio->uio_resid == 0)
		return (0);

if (uio->uio_resid < 0 || uio->uio_resid > IP_MAXPACKET)
		return (EIO);

if ((m = m_uiotombuf(uio, M_NOWAIT, 0, 0, M_PKTHDR)) == NULL)
		return (ENOBUFS);

NET_EPOCH_ENTER(et);
	NG_SEND_DATA_ONLY(error, priv->hook, m);
	NET_EPOCH_EXIT(et);

return (error);
}

/*
 * we are being polled/selected
 * check if there is data available for read
 */
static int
ngdpoll(struct cdev *dev, int events, struct thread *td)
{
	priv_p	priv = (priv_p )dev->si_drv1;
	int revents = 0;

if (events & (POLLIN | POLLRDNORM) &&
	    !IFQ_IS_EMPTY(&priv->readq))
		revents |= events & (POLLIN | POLLRDNORM);

return (revents);
}

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Editing: ng_device.c

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