A slightly updated version: use m_uiotombuf() instead
of homegrown implementation.
On Mon, Oct 11, 2004 at 02:30:28PM +0400, Gleb Smirnoff wrote:
T> Here is a major rewrite of ng_device. The main
T> differencies with current one are:
T>
T> - one dev per node
T> - locking
T> - read queue implemented using struct ifqueue, thus
T> reducing number of reads/writes to temporary buffers.
T>
T> A more detailed list of differencies is attached. A test program
T> also attached.
T>
T> P.S. Yet another crazy netgraph idea: ng_iface + ng_device is
T> a substitute for tun(4). I should write a patch for ppp(8)
T> to work with ng_iface. :)
T>
T> --
T> Totus tuus, Glebius.
T> GLEBIUS-RIPN GLEB-RIPE
T> _______________________________________________
T> [EMAIL PROTECTED] mailing list
T> http://lists.freebsd.org/mailman/listinfo/freebsd-net
T> To unsubscribe, send any mail to "[EMAIL PROTECTED]"
--
Totus tuus, Glebius.
GLEBIUS-RIPN GLEB-RIPE
/*
* Copyright (c) 2002 Mark Santcroos <[EMAIL PROTECTED]>
*
* 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: src/sys/netgraph/ng_device.c,v 1.11 2004/07/20 13:16:17 glebius Exp $
*
*/
#if 0
#define AAA printf("ng_device: %s\n", __func__ );
#else
#define AAA
#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/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 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,
.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;
SLIST_ENTRY(ngd_private) links;
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;
/* List of all active nodes and mutex to protect it */
static SLIST_HEAD(, ngd_private) ngd_nodes = SLIST_HEAD_INITIALIZER(ngd_nodes);
static struct mtx ng_device_mtx;
MTX_SYSINIT(ng_device, &ng_device_mtx, "ng_device", MTX_DEF);
/* Maximum number of NGD devices */
#define MAX_NGD 25 /* should be more than enough for now */
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,
};
/* Helper functions */
static int get_free_unit(void);
/******************************************************************************
* Netgraph methods
******************************************************************************/
/*
* create new node
*/
static int
ng_device_constructor(node_p node)
{
priv_p priv;
AAA
MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
if (priv == NULL)
return (ENOMEM);
mtx_init(&priv->ngd_mtx, "ng_device", NULL, MTX_DEF);
mtx_lock(&priv->ngd_mtx);
mtx_lock(&ng_device_mtx);
priv->unit = get_free_unit();
if(priv->unit < 0) {
printf("%s: No free unit found by get_free_unit(), "
"increase MAX_NGD\n",__func__);
mtx_unlock(&ng_device_mtx);
mtx_destroy(&priv->ngd_mtx);
FREE(priv, M_NETGRAPH);
return(EINVAL);
}
priv->ngddev = make_dev(&ngd_cdevsw, unit2minor(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_unlock(&ng_device_mtx);
mtx_destroy(&priv->ngd_mtx);
FREE(priv, M_NETGRAPH);
return(EINVAL);
}
SLIST_INSERT_HEAD(&ngd_nodes, priv, links);
mtx_unlock(&ng_device_mtx);
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->si_drv1 = priv;
mtx_unlock(&priv->ngd_mtx);
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;
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 NGD_MAX us bigger */
NG_MKRESPONSE(resp, msg,
strlen(NG_DEVICE_DEVNAME) + 3, M_NOWAIT);
if (resp == NULL)
ERROUT(ENOMEM);
strlcpy((char *)resp->data, priv->ngddev->si_name,
strlen(priv->ngddev->si_name) + 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);
AAA
/* 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;
AAA
NGI_GET_M(item, m);
NG_FREE_ITEM(item);
IF_LOCK(&priv->readq);
if (_IF_QFULL(&priv->readq)) {
_IF_DROP(&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));
AAA
destroy_dev(priv->ngddev);
mtx_destroy(&priv->ngd_mtx);
mtx_lock(&ng_device_mtx);
SLIST_REMOVE(&ngd_nodes, priv, ngd_private, links);
mtx_unlock(&ng_device_mtx);
IF_DRAIN(&priv->readq);
mtx_destroy(&(priv)->readq.ifq_mtx);
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;
AAA
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;
AAA
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;
AAA
SLIST_FOREACH(tmp,&sc->head,links) {
if(tmp->ngddev == dev) {
connection = tmp;
}
}
if(connection == NULL) {
printf("%s(): connection is still NULL, no dev found\n",__func__);
return(-1);
}
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;
AAA
/* 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;
mtx_unlock(&priv->ngd_mtx);
if ((error = tsleep(priv, 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)
{
priv_p priv = (priv_p )dev->si_drv1;
struct mbuf *m;
int error = 0;
AAA
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_DONTWAIT, 0)) == NULL)
return (ENOBUFS);
NG_SEND_DATA_ONLY(error, priv->hook, m);
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);
}
/******************************************************************************
* Helper subroutines
******************************************************************************/
static int
get_free_unit()
{
struct ngd_private *priv = NULL;
int n = 0;
int unit = -1;
AAA
mtx_assert(&ng_device_mtx, MA_OWNED);
/* When there is no list yet, the first device unit is always 0. */
if SLIST_EMPTY(&ngd_nodes)
return(0);
/* Just do a brute force loop to find the first free unit that is
* smaller than MAX_NGD.
* Set MAX_NGD to a large value, doesn't impact performance.
*/
for(n = 0; n<MAX_NGD && unit == -1; n++) {
SLIST_FOREACH(priv, &ngd_nodes, links) {
if(priv->unit == n) {
unit = -1;
break;
}
unit = n;
}
}
return (unit);
}
/*
* Copyright (c) 2002 Mark Santcroos <[EMAIL PROTECTED]>
*
* 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.
*
*
* $FreeBSD: src/sys/netgraph/ng_device.h,v 1.3 2004/06/29 15:46:12 marks Exp $
*
*/
#ifndef _NETGRAPH_NG_DEVICE_H_
#define _NETGRAPH_NG_DEVICE_H_
/* Node type name and magic cookie */
#define NG_DEVICE_NODE_TYPE "device"
#define NGM_DEVICE_COOKIE 1091129178
#define NG_DEVICE_DEVNAME "ngd"
/* Netgraph control messages */
enum {
NGM_DEVICE_GET_DEVNAME,
};
#if 0
/* passing ioctl params */
struct ngd_param_s {
void * p;
};
#endif
#endif /* _NETGRAPH_NG_DEVICE_H_ */
List of functional changes:
- Make a single device per single node with a single hook.
This gives us parrallelizm, which can't be achieved on a single
node with many devices/hooks. This also gives us flexibility - we
can play with a particular device node, not affecting others.
- Remove read queue as it is. Use struct ifqueue instead. This change
removes a lot of extra memcpy()ing, m_devget()ting and m_copymem()ming.
In ng_device_receivedata() we take enqueue an mbuf and wake readers.
In ngdread() we take one mbuf from qeueue and uiomove() it to
userspace. If no mbuf is present we optionally block. [1]
- In ngdwrite() we create an mbuf from uio using m_uiotombuf().
This is faster then uiomove() into buffer, and then m_copydata(),
and this is much better than huge m_pullup().
- Perform locking of device
- Perform locking of connection list.
- Clear out _rcvmsg method, since it does nothing good yet.
- Implement NGM_DEVICE_GET_DEVNAME message.
- #if 0 ioctl method, while nothing is done here yet.
- Return immediately from ngdwrite() if uio_resid == 0.
List of tidyness changes:
- Introduce device2priv(), to remove cut'n'paste.
- Use MALLOC/FREE, instead of malloc/free.
- Use unit2minor().
- Use UID_ROOT/GID_WHEEL instead of 0/0.
- Define NGD_DEVICE_DEVNAME, use it.
- Use more nice macros for debugging. [2]
- Return Exxx, not -1.
style(9):
- No "#endif" after short block.
- Break long lines.
- Remove extra spaces, add needed spaces.
[1] Obtained from: if_tun.c
[2] Obtained from: ng_pppoe.c
#include <sys/select.h>
#include <fcntl.h>
#include <signal.h>
#include <stdlib.h>
#include <unistd.h>
#include <netgraph.h>
#include <netgraph/ng_device.h>
#define BUFSIZ 16384
uint32_t count = 0;
void status() {
/* XXX: unsafe */
printf("Written %u bytes\n", count);
};
void status_term() {
status();
exit(0);
};
int o_writedev = 1;
int o_writesock = 1;
int main(int argc, char *argv[]) {
struct ngm_mkpeer mkp;
char msgbuf[sizeof(struct ng_mesg) + 6];
struct ng_mesg *rep = (struct ng_mesg *)msgbuf;
struct sigaction sa;
fd_set rfds;
int ch, cs, ds, f, d, maxfd, n, nread, bytes;
unsigned char buf[BUFSIZ], buf1[BUFSIZ];
char *fname = NULL;
char dname[10];
while ((ch = getopt(argc, argv, "dsf:")) != -1)
switch (ch) {
case 'd':
o_writedev = 0;
break;
case 's':
o_writesock = 0;
break;
case 'f':
fname = optarg;
break;
default:
err(1, "No such option");
}
(void )sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
sa.sa_handler = status;
(void )sigaction(SIGINFO, &sa, (struct sigaction *)0);
sa.sa_handler = status_term;
(void )sigaction(SIGTERM, &sa, (struct sigaction *)0);
(void )sigaction(SIGINT, &sa, (struct sigaction *)0);
/* Create a socket node */
if (NgMkSockNode(NULL, &cs, &ds) == -1)
err(1, "Cannot create netgraph socket node");
snprintf(mkp.type, sizeof(mkp.type), "%s", NG_DEVICE_NODE_TYPE);
snprintf(mkp.ourhook, sizeof(mkp.ourhook), "%s", "device");
snprintf(mkp.peerhook, sizeof(mkp.peerhook), "%s", "socket");
if (NgSendMsg(cs, ".:", NGM_GENERIC_COOKIE, NGM_MKPEER, &mkp,
sizeof(mkp)) == -1)
err(1, "Cannot create netgraph device node");
if (NgSendMsg(cs, ".:device", NGM_DEVICE_COOKIE,
NGM_DEVICE_GET_DEVNAME, NULL, 0) == -1)
err(1, "Cannot send NGM_DEVICE_GET_DEVNAME message");
if (NgRecvMsg(cs, rep, sizeof(msgbuf), NULL) == -1)
err(1, "Cannon receive device name reply");
snprintf(dname, sizeof(dname), "/dev/%s", (char *)rep->data);
printf("Device name is %s\n", dname);
if (fname != NULL) {
if ((f = open(fname, O_RDONLY)) == -1)
err(1, "failed to open %s", fname);
} else
f = STDIN_FILENO;
if ((d = open(dname, O_RDWR)) == -1)
err(1, "failed to open %s", dname);
maxfd = (((d)>(ds))?(d):(ds));
maxfd++;
/* XXX: we do not check for writability */
for (;;) {
FD_ZERO(&rfds);
FD_SET(f, &rfds);
FD_SET(d, &rfds);
FD_SET(ds, &rfds);
if ((n = select(maxfd, &rfds, NULL, NULL, NULL)) == -1)
err(1, "select()");
if (FD_ISSET(d, &rfds)) {
if ((nread = read(d, (void *)buf1, BUFSIZ)) == -1)
err(1, "read from device");
if (nread == 0)
exit (0);
buf[nread] = '\0';
if (fname == NULL)
printf("Read from device: %s\n", buf1);
if (bcmp((void *)buf, (void *)buf1, nread) != 0)
printf("Read from device is not identical\n");
}
if (FD_ISSET(ds, &rfds)) {
if ((nread = read(ds, (void *)buf1, BUFSIZ)) == -1)
err(1, "read from socket");
buf[nread+1] = '\0';
if (fname == NULL)
printf("Read from socket: %s\n", buf1);
if (bcmp((void *)buf, (void *)buf1, nread) != 0)
printf("Read from socket is not identical\n");
}
if (FD_ISSET(f, &rfds)) {
if ((nread = read(f, (void *)buf, BUFSIZ)) == -1)
err(1, "read() from input");
if (nread == 0) {
status();
return (0);
}
buf[nread] = '\0';
if (fname == NULL)
printf("Read from input: %s\n", buf);
if (o_writedev) {
if ((bytes = write(d, (void *)buf, nread)) == -1)
err(1, "write() to device");
if (bytes != nread)
warn("Written %d out of %d to device\n",
bytes, nread);
}
if (o_writesock) {
if ((bytes = write(ds, (void *)buf, nread)) == -1)
err(1, "write() to socket");
if (bytes != nread)
warn("Written %d out of %d to socket\n",
bytes, nread);
}
count += nread;
}
}
}
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