mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-12 09:58:36 +00:00
5e20f43d31
mbuf clusters. Add a flags parameter to accept M_PKTHDR and M_EOR mbuf chain flags. Provide compatibility macro for m_getm() calling m_getm2() with M_PKTHDR set. Rewrite m_uiotombuf() to use m_getm2() for mbuf allocation and do the uiomove() in a tight loop over the mbuf chain. Add a flags parameter to accept mbuf flags to be passed to m_getm2(). Adjust all callers for the extra parameter. Sponsored by: TCP/IP Optimization Fundraise 2005 MFC after: 3 month
493 lines
11 KiB
C
493 lines
11 KiB
C
/*-
|
|
* 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/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;
|
|
|
|
MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
|
|
if (priv == NULL)
|
|
return (ENOMEM);
|
|
|
|
/* 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, 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_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;
|
|
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);
|
|
|
|
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);
|
|
|
|
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_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));
|
|
|
|
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)
|
|
{
|
|
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_DONTWAIT, 0, 0, M_PKTHDR)) == 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);
|
|
}
|